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In this paper, a three-rotor turboprop engine (with a fixed-speed free turbine) is set as the studied object. Under the certain flight conditions and the transient state control law, the main influencing factors affecting the position of low-pressure rotor transient state line are studied. They are the ratio of MIL (moment of inertia of low pressure rotor) to MIH (moment of inertia of high pressure rotor), the ratio of HPC (high pressure compressor) pressure ratio to LPC (low pressure compressor) pressure ratio and the ratio of design point HPR (high pressure rotor) speed to design point LPR (low pressure rotor) speed. The influence of these three factors on the position of low-pressure rotor transient state line is obtained and the mechanism is analyzed.

The rapid fabrication of starch gels with excellent mechanical properties still presents a challenge. This study aimed to develop a simple alcohol soaking method to fabricate strong starch gels in a short time. The mechanical properties, crystallization behaviors, and structural characteristics of starch gels were investigated by rheological testing, texture profile analysis, differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and low-field nuclear magnetic resonance (LF-NMR). The mechanical strength of the starch gel increased from 170.21 g to 666.16 g. The gelation time of starch gel decreased from 12 h (traditional retrogradation) to 2 h. DSC indicated that the enthalpy of starch gel increased from 0.88 J/g to 2.90 J/g. XRD analysis showed that the crystallinity of starch gel increased from 3.8% to 8.9% after alcohol soaking. Alcohol dehydrated the starch gels system, so that amylopectins were arranged to form more crystals. This new simple approach, alcohol soaking to form strong starch gels, can expand the applications of starch in food, agriculture, and textiles.

Abstract Accurate estimation of the remaining useful life of lithium-ion batteries is critically important for electronic devices. In the existing literature, the widely applied model-based approaches for remaining useful battery life estimation are limited by the complexity of the electrochemical modeling required. In addition, data-driven approaches for remaining useful battery life estimation commonly define unreliable sliding window sizes empirically and the prediction accuracy of these approaches needs to be improved. To address the above issues, use of a hybrid neural network with the false nearest neighbors method is proposed in this paper. First, the false nearest neighbors method is used to calculate the sliding window size required for prediction. Second, a hybrid neural network that combines the advantages of a convolutional neural network with those of long short-term memory is designed for model training and prediction. Remaining useful life prediction experiments for batteries with various rated capacities are performed to verify the effectiveness of the proposed approach, and the results demonstrate that the proposed approach offers wide generality and reduced errors when compared with the other state-of-the-art methods.

In this study, the hybrid power system of the diesel, as the main power source, and new energy, as the auxiliary energy is developed. An optimal energy management strategy was proposed for the hybrid ship, aiming to minimize consumption of the fuel. The model of the hybrid power system was established in the MATLAB/SIMULINK simulation environment. The optimal energy management strategy was verified by simulation according to the typical drive cycle of ship compared to original energy management strategy. The simulation results show that the proposed optimization can improve fuel economy while the state of charge of the battery is maintained at reasonable range.

Abstract An orange and an apple juice each containing 250–385 ppm tin were under suspicion of having caused an outbreak of food poisoning in Kuwait in 1967 but did not cause any toxic signs when fed to pigeons, cats and dogs. One cat out of 11 vomited when fed an orange juice containing 540 ppm tin derived from the container, and with juices containing 1370 ppm tin, 20–30% of the cats vomited but none of the dogs was affected. Fruit juices containing 2000 ppm tin caused vomiting in up to 40% of the cats. Modification of orange juices with a high tin content by addition of nitrate or ethanol or by adjustment of the pH from 3 to 6 did not affect the incidence of vomiting. No toxic signs were produced in rats given fruit juices containing added tin salts up to a level of 995 ppm or in rats and cats given aqueous solutions of tin salts (up to 1200 ppm tin) in citric acid. Solid foods containing tin derived from the containers up to the highest level obtainable (470 ppm) had no toxic effect when fed to dogs and cats. Five human volunteers showed no toxic signs after drinking fruit juices containing 498, 540 or 730 ppm tin derived from the containers, but all five had some gastro-intestinal disturbance after drinking a fruit juice containing 1370 ppm tin. A repeat experiment with the latter juice had no effect in four of the volunteers and only mild symptoms in the fifth. In rats and cats, there was no evidence of tin absorption 24 hr after ingestion of fruit juices containing high levels of tin. No tin was recovered from the urine and in the rats 99% was recovered from the faeces. Only minute amounts of tin could be found in the body, apart from the alimentary tract, of a rat that had been given orange juice with a high tin content ad lib. instead of drinking water for 7 days. It is concluded that toxic signs follow the drinking of tin-containing fruit juices by man and cats only with tin levels of approximately 1400 ppm and above, that there is no evidence from these experiments that toxicity is due to the absorption of tin and that the most likely cause is local irritation of the mucous membrane of the alimentary tract.

Here, it is discovered that titanate (H2Ti3O7) nanotubes can confine the merger of erythrosin B (ErB) photocatalysis and TEMPO catalysis for highly selective aerobic oxidation of sulfides under irradiation of green light-emitting diodes (LEDs).