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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Qiancheng Sun; Zela-Koort, Andrea; Stokes, Ava; Salahaldin Alshatshati;

    The goal of this study is to determine the difference in CO2 emissions between 2019-2020 and 2020-2021, more specifically during lockdown periods during the COVID-19 pandemic. In the beginning of the pandemic, most countries were forced into lockdowns, and a countless number of people had to continue their daily work from home in isolation. Previously, people would go to an office or to school and leave their houses empty for eight hours, without having lights or any electronics on. Because of this, there should be a direct correlation between electricity usage before and during lockdowns, as a private residence should have higher electricity consumption during 2020-2021, when they are at home. Using machine learning, we will investigate to see if COVID-19 affected CO2 emissions as a result of more electricity usage in private residences. A model will be made to predict what the CO2 emissions would be for 2019-2020, based on electricity usage data from 2020-2021. Then, the real CO2 emissions from 2019-2020 will be compared with the model’s predicted values, and the difference will indicate if COVID-19 caused an inconsistency between actual and predicted CO2 emissions. Factors that were taken into account when making a model were independent variables relating to outdoor conditions, the number of people living in the house, and the temperature that the thermostat is set at, making the response variable CO2 emissions.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ ZENODOarrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    ZENODO
    Article . 2021
    License: CC BY
    Data sources: ZENODO
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    ZENODO
    Article . 2021
    License: CC BY
    Data sources: Datacite
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    ZENODO
    Article . 2021
    License: CC BY
    Data sources: Datacite
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ ZENODOarrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      ZENODO
      Article . 2021
      License: CC BY
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      ZENODO
      Article . 2021
      License: CC BY
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      ZENODO
      Article . 2021
      License: CC BY
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: C F, Bearer;

    Detecting alcohol use among pregnant women is an important step toward preventing alcohol-related birth defects. A biomarker that could detect alcohol use during pregnancy would aid in earlier identification and intervention for affected infants. The existing potential biomarkers for identifying alcohol use during pregnancy can detect varying degrees of alcohol exposure, or use. However, further research is needed to evaluate these biomarkers.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Alcohol Research and...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Alcohol Research and...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Branstrator, Julia;

    The amount of fresh water available in the world is a finite resource. Large quantities of the fresh water are located in remote locations, while more accessible sources of fresh water are disproportionately distributed around the world. Some populations lack reliable access to clean water for daily life, making the routine use of potable water in toilets of upper-income countries a questionable practice in terms of resource responsibility, energy use, and sustainable infrastructure. The innovative nature of composting toilets offers potential solutions to the downfalls of conventional, waterborne toilets. However, the path to adoption of composting toilets has encountered barriers of different types, impeding further development of a more acceptable system. This study identifies current barriers to the adoption of composting toilets into use in urban and suburban locations in the United States. A purposeful sample of knowledgeable stakeholders in the industry of composting toilets was contacted for open-ended, semi-structured interviews to collect data. The interviews explored four major discussion topics; the perceptions of stakeholders of barriers to the adoption of composting toilets, the barriers in urban and suburban locations, the differences and similarities between the location types, and what project experiences of the stakeholders had taught them about the adoption process. Twelve barriers to adoption were determined, with seven of these barriers discussed in depth due to their perception by stakeholders as the most problematic, yet effective in encouraging adoption if overcome.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Purdue E-Scholararrow_drop_down
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    Other literature type . 2014
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    Thesis . 2014
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Purdue E-Scholararrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Purdue E-Scholar
      Other literature type . 2014
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      Thesis . 2014
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Mohammadzadeh, Leila;

    Increasing demand for clean, globally available energy, provokes the development of alternative or nonconventional energy storage sources with higher energy density and power delivery. Therefore, supercapacitors have received great attention in both academic and industrial research. In addition, supercapacitors are promising new sources of energy in the future energy technology. Hence, rapid progress has been made to understand their fundamentals and applicable aspects. Supercapacitors, also known as ultracapacitors, bridge the gap between batteries and con- ventional capacitors, which means that supercapacitors can accept and deliver charge much faster than batteries, and can store 10 to 100 times more energy per unit volume than fuel cells. Su- percapacitors are well known not only because of their huge energy density, but also due to their long shelf and good cyclic ability. The particular properties of supercapacitors are due to utiliza- tion of electrode materials with very high porosity, and also the specific mechanism of charge storage. In general, there are two fundamental chemical and physical mechanisms for energy storage. In chemical mechanism the charges are released through oxidation-reduction reaction. However, in the physical mechanism the electrical energy is stored physically with electrostatic interaction, while no chemical and phase changes occur. Hence, according to theses charge storage mechanisms supercapacitors are divided into three main groups: electric double layer capacitors (EDLCs), pseudocapacitors and hybrid capacitors. Each of these supercapacitors has its own ad- vantages and disadvantages. These three different kind of supercacaitors are distinguished by their charge storage mechanism and also their electrode materials. Electrical double layer capacitors store the charge based on physical mechanism, and also various types of carbon are used as electrode material. Pseudocapacitors save energy via electro- chemical redox reactions. Besides, these capacitors utilize metal oxides and conducting polymers as electrode material. Hybrid capacitors are another class of supercapacitors, which are constructed of two different types of electrode materials. Therefore, the mechanism of energy storage is a com- bination of both chemical and physical mechanisms. The most used electrode materials in these supercapacitors are a composition of carbon-based materials with either conducting polymers or metal oxide materials. In this work electrical double layer capacitors have captured our attention because of both their interesting energy storage mechanism and also their electrode materials. Electrode material is one of the most important factors in the performance of an electro- chemical energy storage device. Therefore, innovation of new electrode materials is one of the most attractive topics in recent investigations. Especially carbon based electrodes such as carbon nanofibers, activated carbon, carbon nanotubes (CNTs) etc. with their porous structure can pro- vide very huge surface area, consequently immense capacity. Among the examined carbon based materials carbon nanotubes are one of the most interesting because of their unique physical and chemical properties. In fact, special properties of carbon nanotubes such as individual tubular structure, very high chemical stability, low resistivity, high thermal and electrical conductivity and enormous surface area make them good candidates for electrode material in electrical double layer capacitors. Carbon nanotubes are divided into three main groups such as zigzag, armchair and chi- ral tubes. Based on their electronic structure, carbon nanotubes can have metallic or semimetallic characteristic. As mentioned above the huge capacity of carbon materials is due to their massive surface area. Furthermore, in the case of carbon nanotubes both the inner and outer walls can be available for electrolyte ions. At first it was thought, that very narrow pores do not participate in the forma- tion of double layer and energy storage. However, experimental investigations proved, that very narrow pores (lower than 1nm size) not only participate in energy storage, but also exhibit an enor- mous increase of capacitance. Later, theoretical findings showed that the image charge between ion and pore wall screen the repulsion between the ions. This leads to a denser packing of ions, consequently increasing the electrode capacitance. In this work we have studied ion intercalation into carbon nanotubes with diameters lower than 1nm as electrode material by density functional theory. All the calculations have been done using the VASP package. The idea of this work is in that we have imagined carbon nanotubes as electrode materials immersed in solution. Hence, the electrolyte ions try to penetrate into the carbon nanotubes. This work is divided into four parts, which are as follows: In the first part, we have selected truncated carbon nanotubes or carbon nanorings, whoese ends are saturated with hydrogen atoms. In particular, the truncated carbon nanotubes are include the (6,0), (8,0), (10,0) and (12,0) carbon nanotubes. As electrolyte ions alkali (Li, Na and Cs) and halogen (Cl, Br and I) atoms have been tried. Meanwhile, we have neglected the presence of solvent or any counterpart. After simulation it was realized that all the alkali atoms have lost one electron, and also the halogen atoms have obtained one more electron, and also the stable position of all the ions is in the center of the tubes. The results have shown that the surrounding tubes screen the ionic charge very effectively, thereby the ion-ion interactions are strongly reduced, which explains, why narrow tubes store charge more effectively than wider one. We have calculated the insertion energies of the atoms into the tubes and understood that for each atom the diameter of the tube has to be optimized. In the second part of the work, we extended the model of short nanotubes to infinite ones. In particular, we have chosen the (6,2)CNT, the (6,3)CNT, the (8,0)CNT and the (5,5)CNT as electrode material. Among the presented carbon nanotubes the (6,2)CNT and the (8,0)CNT are semimetallic, while the (5,5)CNT and the (6,3)CNT are metallic. Like in the previous work we have inserted alkali (Li, Na and Cs) and halogen (F, Cl, Br and I) atoms into the carbon nanotubes. The results have shown that the atoms were fully ionized. The charge exchange with the CNTs affects the band structure, and turns those tubes that were originally semiconductors into conductors. None of the ions is adsorbed chemically, their position inside the tube and their energies of adsorption are determined by a competition between electrostatic image interactions, which favor a position at the wall, and Pauli repulsion. In models for charge storage it is often assumed that in small tubes the ions are at the center, but we have found several cases where small alkali ions are positioned near the wall. We have also investigated the screening of the Coulomb potential along the axis of the tubes. In particular we wanted to see if there is a difference between semiconducting and conducting CNTs. Within the accuracy of our calculations we found no difference in the screening, because the charge transfer has made the non-chiral tubes conducting. In the third part of this work, we have investigated insertion of alkali and halogen atoms into nitrogen doped (N-doped) carbon nanotubes. Here, the (8,0)CNT and the (5,5)CNT have been chosen as electrode material. The results have shown that N-doped carbon nanotubes are less stable than the pure ones, and also the atoms were fully ionized. The position of the ions in the carbon nanotubes exhibits contradictory behavior in the (8,0)CNT than the (5,5)CNT. In fact, in the former one the ions have high repulsion from the impurity area and try to get away as far as possible. This effect is stronger in the case of small ions like Li+. However, in the (5,5)CNT the ions get closer to the nitrogen area. This behavior is caused by the difference in the spin density of carbon nanotubes. In other words, the spin density is more localized in the N-doped (8,0)CNT than the N- doped (5,5)CNT. Therefore, it causes big repulsion with the inserted ions. The nitrogen doping and charge exchange with ions affect the band structure of carbon nanotubes. Actually, substitution of nitrogen and insertion of alkali atom keep the tubes conducting. However, intercalation of halogen atoms causes both tubes to become semiconducting. We also have calculated insertion energy of ions in the N-doped carbon nanotubes. The results have shown that insertion of the ions is more favorable in the N-doped carbon nanotubes than in the pure ones. In the fourth part of the work, we have taken into account the presence of counterions. For this purpose we have tried insertion of alkali halide monomers (LiF, LiCl and NaCl), a chain of NaCl in nanotube, as well as presence of water molecules with NaCl monomer in a carbon nanotube. Therefore, the (5,5)CNT as electrode material has been chosen. In all the investigated systems, the ions and the molecules are not chemically bound to the carbon nanotube wall. In the case of alkali halide monomers there is no strong charge transfer with the nanotube. However, for the chain of NaCl this interaction is stronger, while the main charge transfer is between the alkali and halide ions in the chain. Water does not exchange charge with the nanotube. Nonetheless, it tries to hydrate the alkali and halide ions confined in the tube.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Open Access Reposito...arrow_drop_down
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    https://dx.doi.org/10.18725/op...
    Doctoral thesis . 2017
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    Authors: J A, Wasielewski; F A, Holloway;

    The complex interaction between alcohol and the body's circadian rhythm has become a rapidly expanding area in chronopharmacology. This area has key implications for the field of alcohol research, because understanding alcohol's effects on the body's internal clock will aid scientists in designing medications and behavioral interventions for treating alcohol abuse and dependence. A number of studies provide evidence that alcohol sensitivity and preference vary with circadian timing. However, only a few studies support alcohol's ability to influence the circadian phase directly. This review focuses on studies examining how alcohol and the body's circadian rhythm interact, using body temperature as an index of circadian rhythm function. Though the research is limited, findings indicate that alcohol sensitivity and preference for drinking to indeed appear to vary with circadian timing and that alcohol may act directly on the central pacemaker to alter circadian functioning.

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    Authors: Manigat, R.; Wallet, F.; André, J.C.;

    The impact of weather change and global pollution on the development and/or the transformation of microorganisms is no longer to be demonstrated. In this respect, heavy trends can be taken into account. This general context needs the development of anticipation procedures and the knowledge of the perception of prevention by the public for short, medium and long term actions. After a short discussion on the concept of emerging issues, the authors present some past examples of public health programs. These examples (malaria, dengue, chikungunya and cholera) are used to propose optimized ways of decision/action that may help to avoid possible crisis in a rapidly changing world. Then, the different lessons learnt are, under certain limits, associated with a forecasting analysis.

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    Authors: Pasha, Mochamad; Rockmore, Marc; Tan, Chih Ming;

    We study the effect of early life exposure to above average levels of rainfall on adult mental health. While we find no effect from pre-natal exposure, post-natal positive rainfall shocks decrease average Center for Epidemiological Studies Depression (CESD) mental health scores by 15 percent and increase the likelihood of depression by 5 percent, a more than 20 percent increase relative to the mean. These effects are limited to females. We rule out prenatal stress and income shocks as pathways and find evidence suggestive of increased exposure to disease. CINCH working paper series, vol. 2018, no. 5

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    https://dx.doi.org/10.17185/du...
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    Authors: Dienst, Jennifer N.;

    The Global Destination Sustainability Movement (GDSN), which was founded in the midst of COVID-19, has detailed sustainability as being the major focus of hotels and events as both industries aim at building back better post-pandemic. Guy Bigwood, GDSM's Chief Changemaker, detailed that the effort around sustainability and events will not just be highlighted within the environmental impact, but diversity and inclusion, transparency, governance, and bundling "green" into it's vision. In 2021 and beyond, planners will look to throw out what was previously noted as checking a box to display to attendees that sustainability mattered to the event. Planners will weave sustainability efforts into all aspects of their event in 2021 and beyond.

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  • The environment is suffering so much, and yet humanity is still adamant about saving it. This study determines the awareness of environmental consumption, waste recycling, and its relationship to the academic performance of selected college students during the pandemic period of COVID-19. Using a descriptive research design, the researcher used an online survey method to collect the data for the study. With the use of the convenience sampling technique, 192 college students from a local city college responded to the online survey. As for the instrument, the study adopted and modified an existing questionnaire and subjected it to reliability and validity tests, which yielded an acceptable result. Using SPSS 22, results show that college students "often" observe different environmental consumption and waste recycling schemes in school. Their academic performance also is "good" based on their grade point average from their previous semester. Also, the study showed a low positive relationship between environmental consumption, waste recycling, and academic performance. The study concluded that college students still practice appropriate environmental consumption and waste recycling, even during the COVID-19 pandemic. Based on the results, the researcher provided some implications for the learning system.

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    Authors: Solak, Nuri;

    Strontium- and magnesium-doped lanthanum gallate (LSGM) perovskite-type compounds and doped ceria-based materials have recently been considered the most promising solid electrolytes for intermediate temperature solid oxide fuel cell (IT-SOFC) applications. While nickel metal is commonly used for the fabrication of cermet-type anodes, the rare earth nickelates, such as Sr-doped La2NiO4 (LSN), are recently developed high-performance cathode materials. For successful implementation in IT-SOFC, it is therefore essential to know the phase equilibria and thermodynamic properties for systems representing the solid electrolyte and electrode materials across their various combinations. This thesis aims to determine the phase equilibria and the thermodynamics of the relevant phases in the systems La-Sr-Ga-Mg-Ni-O, Ce-Gd-Sr-Ni-O, and Ce-Gd-La-Ni-O. Subsystems of these multi-component systems were thermodynamically modeled, based on the available literature and experimental data obtained from this work. The experimental studies were designed based on the calculated phase diagrams. A minimum number of compositions was chosen strategically to obtain a preliminary prediction of the phases in equilibrium in each constituent subsystem. Finally, the experimental and computational results were used to predict the compatibility/reactivity of IT-SOFC components under fabrication and/or operation conditions. Various experimental techniques were employed for determination of the phase equilibria such as Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray analysis (EDX), X-ray Diffraction (XRD), Differential Scanning and Adiabatic Calorimetry, and Mass Spectrometry (MS). The CALPHAD-method (CALculation of PHAse Diagrams) and THERMOCALC software were used to obtain self-consistent sets of Gibbs energy functions. The following systems were investigated experimentally: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, La-Sr-Ga-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O, Gd-Sr-O, Ce-Gd-Ni-O, Ce-Gd-Sr-O, Ce-Sr-Ni-O, Gd-Sr-Ni-O, Ce-Gd-Sr-Ni-O and Ce-Gd-La-Ni-O. Using results from this experimental work and data from the literature, the following systems were thermodynamically modeled: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O and Gd-Sr-O. The systems, La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, and Ce-Gd-Ni-O were extrapolated using parameters optimized from the constituent lower-order systems. In the La-Ni-O system, the enthalpy of formation, entropy and heat capacity of La3Ni2O7, La4Ni3O10, and LaNiO3, were determined experimentally for the first time using equilibration with the gas phase, adiabatic calorimetry and differential scanning calorimetry. In the La-Ga-Ni-O, La-Sr-Ni-O and La-Mg-Ni-O systems, extended solid solutions of La(Ga,Ni)O3, La2(Ni,Ga)O4, La4(Ni,Ga)3O10, (La,Sr)2NiO4, and La2(Ni,Mg)O4 were found, and the limits of their homogeneity ranges have been established for the first time. In addition, the compound LaNiGa11O19, with a magnetoplumbite-type structure was identified, which has not been reported in the literature to date. In the La-Ga-Mg-Ni-O system, the temperature dependence of the quasi-quaternary homogeneity range of La(Ga,Mg,Ni)O3 was determined. In the La-Sr-Ga-Ni-O system, a reaction was observed between LaGaO3 and LaSrNiO4 that formed a melilite-type La1-xSr1+xGa3O7+z, LaGaSrO4 and NiO phase. Similar reaction mechanisms were observed in the La-Sr-Ga-Mg-Ni-O system. Experiments in the Ce-Ni-O system were conducted in air as well as in a reducing atmosphere. It has been found that NiO does not react with CeO2. In the Ce-Sr-O system, the entropy and heat capacity of Sr2CeO4 were experimentally determined for the first time. In the Gd-Ni-O system a eutectic reaction was observed (liquid <=> B-Gd2O3 + NiO). The Gd-Sr-O system was modeled thermodynamically based on data from the literature and the experimentally determined homogeneity range on the Gd2O3-rich site. In the Ce-Sr-Ni-O system the solid solution of (Ce,Sr)2NiO4-z was determined. No reaction between NiO and SrCeO3 / Sr2CeO4 was found. Similarly, in the Ce-Gd-Ni-O system, no reaction was observed between (Ce,Gd)O2-z and NiO. In contrast, solid solutions of Sr(Ce,Gd)O3, Sr2(Ce,Gd)O4 and (Gd,Sr)2(Sr,Ce)O4 were determined in the Ce-Gd-Sr-O system. Also, an extended solid solution of (Gd,Sr)2NiO4 was found in the Gd-Sr-Ni-O system that does not exist in the quasi-binary sections, but is stable in higher-order systems only because a solid solution is formed. It has been also found that there is no NiO solubility in the Gd2SrO4 phase. It could be concluded that doped ceria-based materials are chemically compatible with NiO during conditions typical for both the fabrication and the operation of IT-SOFC’s, whereas LSGM-type electrolytes react with NiO under the fuel cell fabrication conditions. Moreover, although La2NiO4 is a high-performance cathode, it cannot be used in combination with LSGM- or CGO-type electrolytes, due to its reactivity with both of these materials under fabrication conditions. Strontium- und Magnesium- dotierte Lanthangallat Verbindungen des Perowskit-Typs und dotierte Ceroxid-basierte Materialien (DC) wurden kürzlich als hoffnungsvolle Festelektrolyte für die Festoxidbrennstoffzelle bei intermediärer Temperatur (IT-SOFC) betrachtet. Normalerweise wird metallisches Nickel zur Herstellung der Komposit-Anode verwendet, wobei neuerdings die Nickelate von Seltenerdmetallen, wie z.B. Sr-dotierte La2NiO4 (LSN), zur Hochleistungskathode entwickelt werden. Um IT-SOFC erfolgreich herzustellen und auszunutzen sind die Kenntnisse der Phasengleichgewichten und Thermodynamik für Systeme notwendig, welche die Kathoden, Festelektrolyt, Anoden und ihre mögliche Kombinationen repräsentieren. Ziel der Arbeit ist die Phasengleichgewichten und Thermodynamik von La-Sr-Ga-Mg-Ni-O, Ce-Gd-Sr-Ni-O und Ce-Gd-La-Ni-O Systeme zu bestimmen. Die Subsysteme wurden thermodynamisch berechnet auf der Basis von Literaturdaten, während die experimentelle Untersuchungen durch berechnete Phasendiagramm entworfen wurden, wodurch weniger Aufwand benötigt wurde. Schließlich wurden die experimentellen und rechnerischen Ergebnisse verwendet, um die Kompatibilität und Reaktivität von IT-SOFC Komponenten unter Herstellung- und Arbeitsbedingungen vorauszusagen. Für die experimentelle Bestimung der Phasengleichgewichte der Systeme wurden verschiedene Untersuchungsmethoden verwendet, wie z.B. Rasterelektronmikroskopie (REM), Energiedispersive Röntgenspektroskopie (EDX), Dynamische Differenzkalorimetrie und Thermogravimetrie. Die CALPHAD-Methode (Calculation of PHAse Diagrams) mit THERMOCALC Software wurde auch verwendet, um eine selbstkonsequente Reihe von freien Enthalpie Funktionen zu bekommen. Die folgenden Systeme wurden experimentell untersucht: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, La-Sr-Ga-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O, Gd-Sr-O, Ce-Gd-Ni-O, Ce-Gd-Sr-O, Ce-Sr-Ni-O, Gd-Sr-Ni-O, Ce-Gd-Sr-Ni-O, Ce-Gd-La-Ni-O. Durch erhaltenen Ergebnisse und Literaturdaten wurden thermodynamische Modelle für die folgenden Systemen gestellt: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O, Gd-Sr-O. Mit optimierte Parameter von Systemen niedrigerer Ordnung wurden die Systeme La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, und Ce-Gd-Ni-O extrapoliert. Im La-Ni-O System wurden die Bildungsenthalpie, Entropie und Wärmekapazität von La3Ni2O7, La4Ni3O10 und LaNiO3 durch Gleichgewicht mit Gasphase, adiabatische Kalorimetrie und Dynamische Differenzkalorimetrie experimentell bestimmt. In den La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O Systeme wurden erweiterten Mischkristalle La(Ga,Ni)O3, La2(Ni,Ga)O4, La4(Ni,Ga)3O10, (La,Sr)2NiO4 und La2(Ni,Mg)O4 gefunden und ihre Homogenitätsbereichen bestimmt. Zusätzlich wurden die Magnetoplumbite-Typ Verbindung LaNiGa11O19 gefunden, die bislang noch nicht in der Literaturen bekannt war. Im La-Ga-Mg-Ni-O System wurde die Temperaturabhängigkeit von La(Ga,Mg,Ni)O3 Homogenitätsbereich untersucht. Im La-Sr-Ga-Ni-O System wurde eine Reaktion zwischen LaGaO3 und LaSrNiO4 untersucht, die Melilite-Typ La1-xSr1+xGa3O7+z, LaGaSrO4 und NiO bildet. Der gleiche Reaktionsmechanismus wurde auch im La-Sr-Ga-Mg-Ni-O System beobachtet. Die Experimente für Ce-Ni-O System wurden sowohl an Luft als auch im Reduktions- Atmosphäre durchgeführt. Es wurde gefunden, dass NiO nicht mit CeO2 reagiert. Für Ce-Sr-O System wurden zuerst die Entropie und Wärmekapazität von Sr2CeO4 experimentell bestimmt. Für Gd-Ni-O System wurde eine eutektische Reaktion (Schmelze <=> B-Gd2O3 + NiO) untersucht. Für das Gd-Sr-O System wurde ein thermodynamisches Modell aus Literaturdaten aufgestellt und auf Gd2O3-reichen Seite die Homogenitätsbereiche experimentell untersucht. Im Ce-Sr-Ni-O System wurde auf SrO-reichen Seite das Mischkristall (Ce,Sr)2NiO4-z untersucht. Es wurde festgestellt, dass keine Reaktion zwischen NiO und SrCeO3 / Sr2CeO4 stattgefunden hat. Im Ce-Gd-Ni-O System wurde keine Reaktion zwischen (Ce,Gd)O2-z und NiO gefunden. Im Ce-Gd-Sr-O System wurden Mischkristalle Sr(Ce,Gd)O3, Sr2(Ce,Gd)O4 und (Gd,Sr)2(Sr,Ce)O4 untersucht. Im Gd-Sr-Ni-O System wurde ein Mischkristall (Gd,Sr)2NiO4 untersucht, der in quasi-binären Schnitten nicht existiert, aber im System höherer Ordnung stabilisiert wird. Es wurde auch gefunden, dass in die Gd2SrO4 Phase keine NiO gelöst wird. Daraus kann man schliessen, dass dotierte Ceroxide (DC) basierte Materialien mit NiO während der Herstellung und Betrieb von IT-SOFC chemisch kompatibel sind, wobei LSGM Elektrolyte unter Herstellungsbedingungen in der Zelle mit NiO reagieren. Obwohl La2NiO4 eine Hochleistungskathode ist, lässt es sich nicht in Kombination mit LSGM oder DC benutzen, weil es mit den beiden Materialien unter Herstellungsbedingungen in der Zelle miteinander reagiert.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Qiancheng Sun; Zela-Koort, Andrea; Stokes, Ava; Salahaldin Alshatshati;

    The goal of this study is to determine the difference in CO2 emissions between 2019-2020 and 2020-2021, more specifically during lockdown periods during the COVID-19 pandemic. In the beginning of the pandemic, most countries were forced into lockdowns, and a countless number of people had to continue their daily work from home in isolation. Previously, people would go to an office or to school and leave their houses empty for eight hours, without having lights or any electronics on. Because of this, there should be a direct correlation between electricity usage before and during lockdowns, as a private residence should have higher electricity consumption during 2020-2021, when they are at home. Using machine learning, we will investigate to see if COVID-19 affected CO2 emissions as a result of more electricity usage in private residences. A model will be made to predict what the CO2 emissions would be for 2019-2020, based on electricity usage data from 2020-2021. Then, the real CO2 emissions from 2019-2020 will be compared with the model’s predicted values, and the difference will indicate if COVID-19 caused an inconsistency between actual and predicted CO2 emissions. Factors that were taken into account when making a model were independent variables relating to outdoor conditions, the number of people living in the house, and the temperature that the thermostat is set at, making the response variable CO2 emissions.

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    ZENODO
    Article . 2021
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    Article . 2021
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    Article . 2021
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      Article . 2021
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: C F, Bearer;

    Detecting alcohol use among pregnant women is an important step toward preventing alcohol-related birth defects. A biomarker that could detect alcohol use during pregnancy would aid in earlier identification and intervention for affected infants. The existing potential biomarkers for identifying alcohol use during pregnancy can detect varying degrees of alcohol exposure, or use. However, further research is needed to evaluate these biomarkers.

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    Authors: Branstrator, Julia;

    The amount of fresh water available in the world is a finite resource. Large quantities of the fresh water are located in remote locations, while more accessible sources of fresh water are disproportionately distributed around the world. Some populations lack reliable access to clean water for daily life, making the routine use of potable water in toilets of upper-income countries a questionable practice in terms of resource responsibility, energy use, and sustainable infrastructure. The innovative nature of composting toilets offers potential solutions to the downfalls of conventional, waterborne toilets. However, the path to adoption of composting toilets has encountered barriers of different types, impeding further development of a more acceptable system. This study identifies current barriers to the adoption of composting toilets into use in urban and suburban locations in the United States. A purposeful sample of knowledgeable stakeholders in the industry of composting toilets was contacted for open-ended, semi-structured interviews to collect data. The interviews explored four major discussion topics; the perceptions of stakeholders of barriers to the adoption of composting toilets, the barriers in urban and suburban locations, the differences and similarities between the location types, and what project experiences of the stakeholders had taught them about the adoption process. Twelve barriers to adoption were determined, with seven of these barriers discussed in depth due to their perception by stakeholders as the most problematic, yet effective in encouraging adoption if overcome.

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    Other literature type . 2014
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      Other literature type . 2014
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Mohammadzadeh, Leila;

    Increasing demand for clean, globally available energy, provokes the development of alternative or nonconventional energy storage sources with higher energy density and power delivery. Therefore, supercapacitors have received great attention in both academic and industrial research. In addition, supercapacitors are promising new sources of energy in the future energy technology. Hence, rapid progress has been made to understand their fundamentals and applicable aspects. Supercapacitors, also known as ultracapacitors, bridge the gap between batteries and con- ventional capacitors, which means that supercapacitors can accept and deliver charge much faster than batteries, and can store 10 to 100 times more energy per unit volume than fuel cells. Su- percapacitors are well known not only because of their huge energy density, but also due to their long shelf and good cyclic ability. The particular properties of supercapacitors are due to utiliza- tion of electrode materials with very high porosity, and also the specific mechanism of charge storage. In general, there are two fundamental chemical and physical mechanisms for energy storage. In chemical mechanism the charges are released through oxidation-reduction reaction. However, in the physical mechanism the electrical energy is stored physically with electrostatic interaction, while no chemical and phase changes occur. Hence, according to theses charge storage mechanisms supercapacitors are divided into three main groups: electric double layer capacitors (EDLCs), pseudocapacitors and hybrid capacitors. Each of these supercapacitors has its own ad- vantages and disadvantages. These three different kind of supercacaitors are distinguished by their charge storage mechanism and also their electrode materials. Electrical double layer capacitors store the charge based on physical mechanism, and also various types of carbon are used as electrode material. Pseudocapacitors save energy via electro- chemical redox reactions. Besides, these capacitors utilize metal oxides and conducting polymers as electrode material. Hybrid capacitors are another class of supercapacitors, which are constructed of two different types of electrode materials. Therefore, the mechanism of energy storage is a com- bination of both chemical and physical mechanisms. The most used electrode materials in these supercapacitors are a composition of carbon-based materials with either conducting polymers or metal oxide materials. In this work electrical double layer capacitors have captured our attention because of both their interesting energy storage mechanism and also their electrode materials. Electrode material is one of the most important factors in the performance of an electro- chemical energy storage device. Therefore, innovation of new electrode materials is one of the most attractive topics in recent investigations. Especially carbon based electrodes such as carbon nanofibers, activated carbon, carbon nanotubes (CNTs) etc. with their porous structure can pro- vide very huge surface area, consequently immense capacity. Among the examined carbon based materials carbon nanotubes are one of the most interesting because of their unique physical and chemical properties. In fact, special properties of carbon nanotubes such as individual tubular structure, very high chemical stability, low resistivity, high thermal and electrical conductivity and enormous surface area make them good candidates for electrode material in electrical double layer capacitors. Carbon nanotubes are divided into three main groups such as zigzag, armchair and chi- ral tubes. Based on their electronic structure, carbon nanotubes can have metallic or semimetallic characteristic. As mentioned above the huge capacity of carbon materials is due to their massive surface area. Furthermore, in the case of carbon nanotubes both the inner and outer walls can be available for electrolyte ions. At first it was thought, that very narrow pores do not participate in the forma- tion of double layer and energy storage. However, experimental investigations proved, that very narrow pores (lower than 1nm size) not only participate in energy storage, but also exhibit an enor- mous increase of capacitance. Later, theoretical findings showed that the image charge between ion and pore wall screen the repulsion between the ions. This leads to a denser packing of ions, consequently increasing the electrode capacitance. In this work we have studied ion intercalation into carbon nanotubes with diameters lower than 1nm as electrode material by density functional theory. All the calculations have been done using the VASP package. The idea of this work is in that we have imagined carbon nanotubes as electrode materials immersed in solution. Hence, the electrolyte ions try to penetrate into the carbon nanotubes. This work is divided into four parts, which are as follows: In the first part, we have selected truncated carbon nanotubes or carbon nanorings, whoese ends are saturated with hydrogen atoms. In particular, the truncated carbon nanotubes are include the (6,0), (8,0), (10,0) and (12,0) carbon nanotubes. As electrolyte ions alkali (Li, Na and Cs) and halogen (Cl, Br and I) atoms have been tried. Meanwhile, we have neglected the presence of solvent or any counterpart. After simulation it was realized that all the alkali atoms have lost one electron, and also the halogen atoms have obtained one more electron, and also the stable position of all the ions is in the center of the tubes. The results have shown that the surrounding tubes screen the ionic charge very effectively, thereby the ion-ion interactions are strongly reduced, which explains, why narrow tubes store charge more effectively than wider one. We have calculated the insertion energies of the atoms into the tubes and understood that for each atom the diameter of the tube has to be optimized. In the second part of the work, we extended the model of short nanotubes to infinite ones. In particular, we have chosen the (6,2)CNT, the (6,3)CNT, the (8,0)CNT and the (5,5)CNT as electrode material. Among the presented carbon nanotubes the (6,2)CNT and the (8,0)CNT are semimetallic, while the (5,5)CNT and the (6,3)CNT are metallic. Like in the previous work we have inserted alkali (Li, Na and Cs) and halogen (F, Cl, Br and I) atoms into the carbon nanotubes. The results have shown that the atoms were fully ionized. The charge exchange with the CNTs affects the band structure, and turns those tubes that were originally semiconductors into conductors. None of the ions is adsorbed chemically, their position inside the tube and their energies of adsorption are determined by a competition between electrostatic image interactions, which favor a position at the wall, and Pauli repulsion. In models for charge storage it is often assumed that in small tubes the ions are at the center, but we have found several cases where small alkali ions are positioned near the wall. We have also investigated the screening of the Coulomb potential along the axis of the tubes. In particular we wanted to see if there is a difference between semiconducting and conducting CNTs. Within the accuracy of our calculations we found no difference in the screening, because the charge transfer has made the non-chiral tubes conducting. In the third part of this work, we have investigated insertion of alkali and halogen atoms into nitrogen doped (N-doped) carbon nanotubes. Here, the (8,0)CNT and the (5,5)CNT have been chosen as electrode material. The results have shown that N-doped carbon nanotubes are less stable than the pure ones, and also the atoms were fully ionized. The position of the ions in the carbon nanotubes exhibits contradictory behavior in the (8,0)CNT than the (5,5)CNT. In fact, in the former one the ions have high repulsion from the impurity area and try to get away as far as possible. This effect is stronger in the case of small ions like Li+. However, in the (5,5)CNT the ions get closer to the nitrogen area. This behavior is caused by the difference in the spin density of carbon nanotubes. In other words, the spin density is more localized in the N-doped (8,0)CNT than the N- doped (5,5)CNT. Therefore, it causes big repulsion with the inserted ions. The nitrogen doping and charge exchange with ions affect the band structure of carbon nanotubes. Actually, substitution of nitrogen and insertion of alkali atom keep the tubes conducting. However, intercalation of halogen atoms causes both tubes to become semiconducting. We also have calculated insertion energy of ions in the N-doped carbon nanotubes. The results have shown that insertion of the ions is more favorable in the N-doped carbon nanotubes than in the pure ones. In the fourth part of the work, we have taken into account the presence of counterions. For this purpose we have tried insertion of alkali halide monomers (LiF, LiCl and NaCl), a chain of NaCl in nanotube, as well as presence of water molecules with NaCl monomer in a carbon nanotube. Therefore, the (5,5)CNT as electrode material has been chosen. In all the investigated systems, the ions and the molecules are not chemically bound to the carbon nanotube wall. In the case of alkali halide monomers there is no strong charge transfer with the nanotube. However, for the chain of NaCl this interaction is stronger, while the main charge transfer is between the alkali and halide ions in the chain. Water does not exchange charge with the nanotube. Nonetheless, it tries to hydrate the alkali and halide ions confined in the tube.

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    https://dx.doi.org/10.18725/op...
    Doctoral thesis . 2017
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      https://dx.doi.org/10.18725/op...
      Doctoral thesis . 2017
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    Authors: J A, Wasielewski; F A, Holloway;

    The complex interaction between alcohol and the body's circadian rhythm has become a rapidly expanding area in chronopharmacology. This area has key implications for the field of alcohol research, because understanding alcohol's effects on the body's internal clock will aid scientists in designing medications and behavioral interventions for treating alcohol abuse and dependence. A number of studies provide evidence that alcohol sensitivity and preference vary with circadian timing. However, only a few studies support alcohol's ability to influence the circadian phase directly. This review focuses on studies examining how alcohol and the body's circadian rhythm interact, using body temperature as an index of circadian rhythm function. Though the research is limited, findings indicate that alcohol sensitivity and preference for drinking to indeed appear to vary with circadian timing and that alcohol may act directly on the central pacemaker to alter circadian functioning.

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    Authors: Manigat, R.; Wallet, F.; André, J.C.;

    The impact of weather change and global pollution on the development and/or the transformation of microorganisms is no longer to be demonstrated. In this respect, heavy trends can be taken into account. This general context needs the development of anticipation procedures and the knowledge of the perception of prevention by the public for short, medium and long term actions. After a short discussion on the concept of emerging issues, the authors present some past examples of public health programs. These examples (malaria, dengue, chikungunya and cholera) are used to propose optimized ways of decision/action that may help to avoid possible crisis in a rapidly changing world. Then, the different lessons learnt are, under certain limits, associated with a forecasting analysis.

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    Article . 2010
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      Article . 2010
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    Authors: Pasha, Mochamad; Rockmore, Marc; Tan, Chih Ming;

    We study the effect of early life exposure to above average levels of rainfall on adult mental health. While we find no effect from pre-natal exposure, post-natal positive rainfall shocks decrease average Center for Epidemiological Studies Depression (CESD) mental health scores by 15 percent and increase the likelihood of depression by 5 percent, a more than 20 percent increase relative to the mean. These effects are limited to females. We rule out prenatal stress and income shocks as pathways and find evidence suggestive of increased exposure to disease. CINCH working paper series, vol. 2018, no. 5

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    https://dx.doi.org/10.17185/du...
    Other literature type . 2018
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    Research . 2018
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      https://dx.doi.org/10.17185/du...
      Other literature type . 2018
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      Research . 2018
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    Authors: Dienst, Jennifer N.;

    The Global Destination Sustainability Movement (GDSN), which was founded in the midst of COVID-19, has detailed sustainability as being the major focus of hotels and events as both industries aim at building back better post-pandemic. Guy Bigwood, GDSM's Chief Changemaker, detailed that the effort around sustainability and events will not just be highlighted within the environmental impact, but diversity and inclusion, transparency, governance, and bundling "green" into it's vision. In 2021 and beyond, planners will look to throw out what was previously noted as checking a box to display to attendees that sustainability mattered to the event. Planners will weave sustainability efforts into all aspects of their event in 2021 and beyond.

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    VTechWorks
    Article . 2021
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  • The environment is suffering so much, and yet humanity is still adamant about saving it. This study determines the awareness of environmental consumption, waste recycling, and its relationship to the academic performance of selected college students during the pandemic period of COVID-19. Using a descriptive research design, the researcher used an online survey method to collect the data for the study. With the use of the convenience sampling technique, 192 college students from a local city college responded to the online survey. As for the instrument, the study adopted and modified an existing questionnaire and subjected it to reliability and validity tests, which yielded an acceptable result. Using SPSS 22, results show that college students "often" observe different environmental consumption and waste recycling schemes in school. Their academic performance also is "good" based on their grade point average from their previous semester. Also, the study showed a low positive relationship between environmental consumption, waste recycling, and academic performance. The study concluded that college students still practice appropriate environmental consumption and waste recycling, even during the COVID-19 pandemic. Based on the results, the researcher provided some implications for the learning system.

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    Authors: Solak, Nuri;

    Strontium- and magnesium-doped lanthanum gallate (LSGM) perovskite-type compounds and doped ceria-based materials have recently been considered the most promising solid electrolytes for intermediate temperature solid oxide fuel cell (IT-SOFC) applications. While nickel metal is commonly used for the fabrication of cermet-type anodes, the rare earth nickelates, such as Sr-doped La2NiO4 (LSN), are recently developed high-performance cathode materials. For successful implementation in IT-SOFC, it is therefore essential to know the phase equilibria and thermodynamic properties for systems representing the solid electrolyte and electrode materials across their various combinations. This thesis aims to determine the phase equilibria and the thermodynamics of the relevant phases in the systems La-Sr-Ga-Mg-Ni-O, Ce-Gd-Sr-Ni-O, and Ce-Gd-La-Ni-O. Subsystems of these multi-component systems were thermodynamically modeled, based on the available literature and experimental data obtained from this work. The experimental studies were designed based on the calculated phase diagrams. A minimum number of compositions was chosen strategically to obtain a preliminary prediction of the phases in equilibrium in each constituent subsystem. Finally, the experimental and computational results were used to predict the compatibility/reactivity of IT-SOFC components under fabrication and/or operation conditions. Various experimental techniques were employed for determination of the phase equilibria such as Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray analysis (EDX), X-ray Diffraction (XRD), Differential Scanning and Adiabatic Calorimetry, and Mass Spectrometry (MS). The CALPHAD-method (CALculation of PHAse Diagrams) and THERMOCALC software were used to obtain self-consistent sets of Gibbs energy functions. The following systems were investigated experimentally: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, La-Sr-Ga-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O, Gd-Sr-O, Ce-Gd-Ni-O, Ce-Gd-Sr-O, Ce-Sr-Ni-O, Gd-Sr-Ni-O, Ce-Gd-Sr-Ni-O and Ce-Gd-La-Ni-O. Using results from this experimental work and data from the literature, the following systems were thermodynamically modeled: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O and Gd-Sr-O. The systems, La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, and Ce-Gd-Ni-O were extrapolated using parameters optimized from the constituent lower-order systems. In the La-Ni-O system, the enthalpy of formation, entropy and heat capacity of La3Ni2O7, La4Ni3O10, and LaNiO3, were determined experimentally for the first time using equilibration with the gas phase, adiabatic calorimetry and differential scanning calorimetry. In the La-Ga-Ni-O, La-Sr-Ni-O and La-Mg-Ni-O systems, extended solid solutions of La(Ga,Ni)O3, La2(Ni,Ga)O4, La4(Ni,Ga)3O10, (La,Sr)2NiO4, and La2(Ni,Mg)O4 were found, and the limits of their homogeneity ranges have been established for the first time. In addition, the compound LaNiGa11O19, with a magnetoplumbite-type structure was identified, which has not been reported in the literature to date. In the La-Ga-Mg-Ni-O system, the temperature dependence of the quasi-quaternary homogeneity range of La(Ga,Mg,Ni)O3 was determined. In the La-Sr-Ga-Ni-O system, a reaction was observed between LaGaO3 and LaSrNiO4 that formed a melilite-type La1-xSr1+xGa3O7+z, LaGaSrO4 and NiO phase. Similar reaction mechanisms were observed in the La-Sr-Ga-Mg-Ni-O system. Experiments in the Ce-Ni-O system were conducted in air as well as in a reducing atmosphere. It has been found that NiO does not react with CeO2. In the Ce-Sr-O system, the entropy and heat capacity of Sr2CeO4 were experimentally determined for the first time. In the Gd-Ni-O system a eutectic reaction was observed (liquid <=> B-Gd2O3 + NiO). The Gd-Sr-O system was modeled thermodynamically based on data from the literature and the experimentally determined homogeneity range on the Gd2O3-rich site. In the Ce-Sr-Ni-O system the solid solution of (Ce,Sr)2NiO4-z was determined. No reaction between NiO and SrCeO3 / Sr2CeO4 was found. Similarly, in the Ce-Gd-Ni-O system, no reaction was observed between (Ce,Gd)O2-z and NiO. In contrast, solid solutions of Sr(Ce,Gd)O3, Sr2(Ce,Gd)O4 and (Gd,Sr)2(Sr,Ce)O4 were determined in the Ce-Gd-Sr-O system. Also, an extended solid solution of (Gd,Sr)2NiO4 was found in the Gd-Sr-Ni-O system that does not exist in the quasi-binary sections, but is stable in higher-order systems only because a solid solution is formed. It has been also found that there is no NiO solubility in the Gd2SrO4 phase. It could be concluded that doped ceria-based materials are chemically compatible with NiO during conditions typical for both the fabrication and the operation of IT-SOFC’s, whereas LSGM-type electrolytes react with NiO under the fuel cell fabrication conditions. Moreover, although La2NiO4 is a high-performance cathode, it cannot be used in combination with LSGM- or CGO-type electrolytes, due to its reactivity with both of these materials under fabrication conditions. Strontium- und Magnesium- dotierte Lanthangallat Verbindungen des Perowskit-Typs und dotierte Ceroxid-basierte Materialien (DC) wurden kürzlich als hoffnungsvolle Festelektrolyte für die Festoxidbrennstoffzelle bei intermediärer Temperatur (IT-SOFC) betrachtet. Normalerweise wird metallisches Nickel zur Herstellung der Komposit-Anode verwendet, wobei neuerdings die Nickelate von Seltenerdmetallen, wie z.B. Sr-dotierte La2NiO4 (LSN), zur Hochleistungskathode entwickelt werden. Um IT-SOFC erfolgreich herzustellen und auszunutzen sind die Kenntnisse der Phasengleichgewichten und Thermodynamik für Systeme notwendig, welche die Kathoden, Festelektrolyt, Anoden und ihre mögliche Kombinationen repräsentieren. Ziel der Arbeit ist die Phasengleichgewichten und Thermodynamik von La-Sr-Ga-Mg-Ni-O, Ce-Gd-Sr-Ni-O und Ce-Gd-La-Ni-O Systeme zu bestimmen. Die Subsysteme wurden thermodynamisch berechnet auf der Basis von Literaturdaten, während die experimentelle Untersuchungen durch berechnete Phasendiagramm entworfen wurden, wodurch weniger Aufwand benötigt wurde. Schließlich wurden die experimentellen und rechnerischen Ergebnisse verwendet, um die Kompatibilität und Reaktivität von IT-SOFC Komponenten unter Herstellung- und Arbeitsbedingungen vorauszusagen. Für die experimentelle Bestimung der Phasengleichgewichte der Systeme wurden verschiedene Untersuchungsmethoden verwendet, wie z.B. Rasterelektronmikroskopie (REM), Energiedispersive Röntgenspektroskopie (EDX), Dynamische Differenzkalorimetrie und Thermogravimetrie. Die CALPHAD-Methode (Calculation of PHAse Diagrams) mit THERMOCALC Software wurde auch verwendet, um eine selbstkonsequente Reihe von freien Enthalpie Funktionen zu bekommen. Die folgenden Systeme wurden experimentell untersucht: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, La-Sr-Ga-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O, Gd-Sr-O, Ce-Gd-Ni-O, Ce-Gd-Sr-O, Ce-Sr-Ni-O, Gd-Sr-Ni-O, Ce-Gd-Sr-Ni-O, Ce-Gd-La-Ni-O. Durch erhaltenen Ergebnisse und Literaturdaten wurden thermodynamische Modelle für die folgenden Systemen gestellt: La-Ni-O, La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O, Ce-Ni-O, Ce-Sr-O, Gd-Ni-O, Gd-Sr-O. Mit optimierte Parameter von Systemen niedrigerer Ordnung wurden die Systeme La-Ga-Mg-Ni-O, La-Sr-Ga-Ni-O, und Ce-Gd-Ni-O extrapoliert. Im La-Ni-O System wurden die Bildungsenthalpie, Entropie und Wärmekapazität von La3Ni2O7, La4Ni3O10 und LaNiO3 durch Gleichgewicht mit Gasphase, adiabatische Kalorimetrie und Dynamische Differenzkalorimetrie experimentell bestimmt. In den La-Ga-Ni-O, La-Sr-Ni-O, La-Mg-Ni-O Systeme wurden erweiterten Mischkristalle La(Ga,Ni)O3, La2(Ni,Ga)O4, La4(Ni,Ga)3O10, (La,Sr)2NiO4 und La2(Ni,Mg)O4 gefunden und ihre Homogenitätsbereichen bestimmt. Zusätzlich wurden die Magnetoplumbite-Typ Verbindung LaNiGa11O19 gefunden, die bislang noch nicht in der Literaturen bekannt war. Im La-Ga-Mg-Ni-O System wurde die Temperaturabhängigkeit von La(Ga,Mg,Ni)O3 Homogenitätsbereich untersucht. Im La-Sr-Ga-Ni-O System wurde eine Reaktion zwischen LaGaO3 und LaSrNiO4 untersucht, die Melilite-Typ La1-xSr1+xGa3O7+z, LaGaSrO4 und NiO bildet. Der gleiche Reaktionsmechanismus wurde auch im La-Sr-Ga-Mg-Ni-O System beobachtet. Die Experimente für Ce-Ni-O System wurden sowohl an Luft als auch im Reduktions- Atmosphäre durchgeführt. Es wurde gefunden, dass NiO nicht mit CeO2 reagiert. Für Ce-Sr-O System wurden zuerst die Entropie und Wärmekapazität von Sr2CeO4 experimentell bestimmt. Für Gd-Ni-O System wurde eine eutektische Reaktion (Schmelze <=> B-Gd2O3 + NiO) untersucht. Für das Gd-Sr-O System wurde ein thermodynamisches Modell aus Literaturdaten aufgestellt und auf Gd2O3-reichen Seite die Homogenitätsbereiche experimentell untersucht. Im Ce-Sr-Ni-O System wurde auf SrO-reichen Seite das Mischkristall (Ce,Sr)2NiO4-z untersucht. Es wurde festgestellt, dass keine Reaktion zwischen NiO und SrCeO3 / Sr2CeO4 stattgefunden hat. Im Ce-Gd-Ni-O System wurde keine Reaktion zwischen (Ce,Gd)O2-z und NiO gefunden. Im Ce-Gd-Sr-O System wurden Mischkristalle Sr(Ce,Gd)O3, Sr2(Ce,Gd)O4 und (Gd,Sr)2(Sr,Ce)O4 untersucht. Im Gd-Sr-Ni-O System wurde ein Mischkristall (Gd,Sr)2NiO4 untersucht, der in quasi-binären Schnitten nicht existiert, aber im System höherer Ordnung stabilisiert wird. Es wurde auch gefunden, dass in die Gd2SrO4 Phase keine NiO gelöst wird. Daraus kann man schliessen, dass dotierte Ceroxide (DC) basierte Materialien mit NiO während der Herstellung und Betrieb von IT-SOFC chemisch kompatibel sind, wobei LSGM Elektrolyte unter Herstellungsbedingungen in der Zelle mit NiO reagieren. Obwohl La2NiO4 eine Hochleistungskathode ist, lässt es sich nicht in Kombination mit LSGM oder DC benutzen, weil es mit den beiden Materialien unter Herstellungsbedingungen in der Zelle miteinander reagiert.

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    Doctoral thesis . 2007
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