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SignificanceEstimates of nutrient allocation in different plant tissues and the relationships between the nutrient contents and photosynthetic capacity are critical to predicting ecosystem carbon sequestration under global change. Here, we provide an assessment of large-scale patterns of community-level nitrogen and phosphorus concentrations in different plant tissues and then examine how nutrient allocations are coupled with plant productivity. The results show that nutrient concentrations in leaves are less responsive to abiotic environments than those in woody stems and roots (stable leaf nutrient concentration hypothesis); the relationships between vegetation primary productivity and leaf nutrient contents are stronger when less nutrients are allocated to the woody tissues (productivity–nutrient allocation hypothesis) and are stronger in deciduous than in evergreen vegetation (productivity–leaf lifespan hypothesis).

AbstractGold, silver, platinum and palladium typically crystallize with the face-centred cubic structure. Here we report the high-yield solution synthesis of gold nanoribbons in the 4H hexagonal polytype, a previously unreported metastable phase of gold. These gold nanoribbons undergo a phase transition from the original 4H hexagonal to face-centred cubic structure on ligand exchange under ambient conditions. Using monochromated electron energy-loss spectroscopy, the strong infrared plasmon absorption of single 4H gold nanoribbons is observed. Furthermore, the 4H hexagonal phases of silver, palladium and platinum can be readily stabilized through direct epitaxial growth of these metals on the 4H gold nanoribbon surface. Our findings may open up new strategies for the crystal phase-controlled synthesis of advanced noble metal nanomaterials.

Livestock manure waste (LMW) has turned into an important source of greenhouse gas emissions. Livestock manure waste recycling (LMWR) has great significance for reducing greenhouse gas emissions in the LMW management process. For a long time, the government has mainly adopted environmental regulation to accelerate LMWR, but the recycling degree is still low. The objective of this study was to assess the impact of environmental regulation on LMWR. Empirical evidence was obtained through methods of in-depth measures and questionnaire investigation from 465 households engaged in breeding pigs in Hebei, Henan, and Hubei, China. The double hurdle model was employed to empirically assess the impact of environmental regulation on household LMWR behavior, and the moderating effects of guiding regulation were further verified. The results were that (1) 62.30% of the households in the sample were willing to implement LMWR behavior, but the recycling degree was only 42.50% of the LMW emission amount. (2) Environmental regulation was found to positively impact household LMWR behavior, while the effects were mainly contributed by imperative and guiding regulation. (3) Guiding regulation was shown to positively moderate the influences of imperative and incentive regulation on household LMWR behavior. (4) The impact of environmental regulation on different scales of household LMWR behavior was found to be heterogeneous. Finally, some recommendations, such as improving subsidy standards, classifying to promote LMWR technology, as well as increasing the matched proportions of planting and breeding, were proposed.

AbstractThis paper describes the design and CFD analysis of a Formula SAE car. A numerical study of a rear engine SAE racecar is presented. The focus of the study is to investigate the aerodynamics characteristics of a SAE race car with front spoiler, without front spoiler and with firewall vents. Formula SAE is a college level student design competition where every year students of universities all over the world build and compete with open-wheel formula-style race [1]. Society of Automotive Engineers (SAE) INDIA racecar focuses on developing a simple, lightweight, easily operated open chassis vehicle. Compliance with SAE rules is compulsory and governs a significant portion of the objectives. The aerodynamics study of the SAE car is made to reduce the drag force. The study was performed using the CFD package. The main goal of this study is to enhance the stability of the vehicle and reduce the drag. With this the track performance will be increased also the resistance of air to the vehicle gets reduced. The CFD analysis is done on full scale model. The aerodynamic study is conducted in the ANSYS Fluent software to perform a turbulent stimulation (using k - ɛ model) of the air flow on the SAE car. The results are graphically shown with co – efficient of drag, velocity contour.

As a new type of agricultural management organization alliance, the effect of the benefit linkage generated by agricultural industrialization consortium on collaboration performance is closely related to the sustainable development of the agricultural economy. Based on survey data on consortia in Shanghai, this paper analyzes the effects of benefit linkage and uses multiple linear regression modeling to comprehensively explore the impact of benefit linkage effects on collaboration performance from both subjective and objective aspects, as well as the differences in impact on the collaboration performance of consortia with different organizational structures. The results show that the benefit linkage effect has a positive impact on collaboration performance, and there are differences in the impact of the benefit linkage effect on collaboration performance under different types of organizational structures, among which the resource allocation effect, capitalization effect and correlation effect of the benefit linkage of non-joint stock consortia have a positive impact on collaboration performance; the resource allocation effect of joint-stock consortia has no significant impact on collaboration performance, the capitalization effect on collaboration performance is significantly lower than that of non-joint stock consortia, and the correlation effect on collaboration performance is significantly higher than that of non-joint-stock consortia. Therefore, under a certain benefit linkage, according to the establishment purpose and collaboration goal, a consortium with different types of organizational structures should be established to give full play to the impact of the benefit linkage effect on collaboration performance and promote the sustainable development of agricultural industrialization.

AbstractThe Green Revolution is often seen as epitomising the dawn of scientific and technological advancement and modernity in the agricultural sector across developing countries, a process that unfolded from the 1940s through to the 1980s. Despite the time that has elapsed, this episode of the past continues to resonate today, and still shapes the institutions and practices of agricultural science and technology. In Brazil, China, and India, narratives of science-led agricultural transformations portray that period in glorifying terms—entailing pressing national imperatives, unprecedented achievements, and heroic individuals or organizations. These “epic narratives” draw on the past to produce meaning and empower the actors that deploy them. Epic narratives are reproduced over time and perpetuate a conviction about the heroic power of science and technology in agricultural development. By crafting history and cultivating a sense of scientific nationalism, exceptionalism, and heritage, these epic narratives sustain power-knowledge relations in agricultural science and technology, which are underpinned by a hegemonic modernization paradigm. Unravelling the processes of assemblage and reproduction of epic narratives helps us make sense of how science and technology actors draw on their subjective representations of the past to assert their position in the field at present. This includes making claims about their credentials to envision and deliver sustainable solutions for agriculture into the future.

Energy is considered as a key factor which determines the economic development in the entire sector of any region. Biomass is one of the primary energy sources in rural areas. The study was carried out to examine the utilization pattern of biomass energy and socioeconomic dimensions associated with rural areas of Yelandur, Karnataka, India. Field studies in these villages covering 645 households were made to collect the data and assess the socioeconomic conditions that govern the bio- mass utilization pattern for meeting energy requirements. Firewood is the primary energy source (94.78 %) for cooking and heating among these rural folk. Most of them are illiterates (60 %) with 28.96 % of them having a meagre income. Traditional biomass stoves are used pre- dominantly. The study shows that there is a positive cor- relation (R 2 = 0.98) between the households size and volume of firewood consumption. The study has revealed that the firewood fuels are the dominant source of energy for cooking and heating purposes.