大豆分离蛋白作为完全可降解性的生物聚合物,无抗菌性、机械性能及阻隔性能差限制了其在包装领域中的应用,该研究通过将纳米ZnO和纳米TiO_(2)分别加入大豆分离蛋白(Soy Protein Isolate,SPI)中制备SPI/纳米ZnO复合膜和SPI/纳米TiO_(2)...大豆分离蛋白作为完全可降解性的生物聚合物,无抗菌性、机械性能及阻隔性能差限制了其在包装领域中的应用,该研究通过将纳米ZnO和纳米TiO_(2)分别加入大豆分离蛋白(Soy Protein Isolate,SPI)中制备SPI/纳米ZnO复合膜和SPI/纳米TiO_(2)复合膜,并对复合膜的包装特性进行比较,确定一种更有利于提升大豆分离蛋白基薄膜相关性能的纳米材料。分析结果表明:纳米ZnO在SPI膜液中的分散性优于纳米TiO_(2)在SPI膜液中的分散性,纳米ZnO和大豆蛋白的相容性更好,且成膜后能更好的发挥协同作用,SPI/纳米ZnO复合膜较SPI/纳米TiO_(2)复合膜的机械性能、阻隔性能和抗菌性能更为突出(P<0.05)。纳米ZnO和大豆蛋白以3%的质量比制备复合膜时,SPI/纳米ZnO(SZ3)复合膜相比较于SPI膜,拉伸强度从6.64 MPa升至18.33 MPa,水蒸气透过率从20.63×10^(-2)g·mm/(m^(2)·h·kPa)降至2.94×10^(-2)g·mm/(m^(2)·h·kPa),氧气透过率从3.32×10^(-5)g·m/(m^(2)·d·kPa)降至1.54×10^(-5)g·m/(m^(2)·d·kPa)。此外,复合膜对大肠杆菌和短小芽孢杆菌表现出优异的抗菌性能,抑菌性随着纳米粒子的添加呈上升趋势,在活性包装应用中具有极大潜力。以上研究结果将为大豆蛋白基薄膜的未来应用提供理论参考。展开更多
In view of the universality of the parallel connection of solar cells and their mismatch problem, in the present paper, we select two shunt solar cells (connected in parallel) as our research object, and use the equiv...In view of the universality of the parallel connection of solar cells and their mismatch problem, in the present paper, we select two shunt solar cells (connected in parallel) as our research object, and use the equivalent one-diode circuit of the solar cell and the analysis of the two-body model. At first, the equations of current and voltage are deduced from the related electrical laws and the circuit diagram of the two solar cells connected in parallel. Then, according to the experimentally measured data of typical single-crystalline silicon solar cells (125 mm×125 mm), we select the appropriate simulation parameters. Following this, by using the photo-generated current, the shunt resistance, and the serial resistance of one of the shunt solar cells and the load resistance as independent variables, in turn, the changing characteristics of each branch current in the two shunt solar cells are numerically discussed and analyzed for these four cases for the first time. At the same time, we provide a simple physical explanation for the modeling results. Our analyses show that these parameters have different impacts on the internal currents of solar cells connected in parallel. These results provide a reference to solve the problem of connecting solar cells and to develop higher efficiency solar cells and systems. Meanwhile, the results will contribute to a better comprehension of the reasons for efficiency loss of solar cells and systems, and deepen the understanding of the electrical of solar cells behavior for high performance photovoltaic applications.展开更多
文摘大豆分离蛋白作为完全可降解性的生物聚合物,无抗菌性、机械性能及阻隔性能差限制了其在包装领域中的应用,该研究通过将纳米ZnO和纳米TiO_(2)分别加入大豆分离蛋白(Soy Protein Isolate,SPI)中制备SPI/纳米ZnO复合膜和SPI/纳米TiO_(2)复合膜,并对复合膜的包装特性进行比较,确定一种更有利于提升大豆分离蛋白基薄膜相关性能的纳米材料。分析结果表明:纳米ZnO在SPI膜液中的分散性优于纳米TiO_(2)在SPI膜液中的分散性,纳米ZnO和大豆蛋白的相容性更好,且成膜后能更好的发挥协同作用,SPI/纳米ZnO复合膜较SPI/纳米TiO_(2)复合膜的机械性能、阻隔性能和抗菌性能更为突出(P<0.05)。纳米ZnO和大豆蛋白以3%的质量比制备复合膜时,SPI/纳米ZnO(SZ3)复合膜相比较于SPI膜,拉伸强度从6.64 MPa升至18.33 MPa,水蒸气透过率从20.63×10^(-2)g·mm/(m^(2)·h·kPa)降至2.94×10^(-2)g·mm/(m^(2)·h·kPa),氧气透过率从3.32×10^(-5)g·m/(m^(2)·d·kPa)降至1.54×10^(-5)g·m/(m^(2)·d·kPa)。此外,复合膜对大肠杆菌和短小芽孢杆菌表现出优异的抗菌性能,抑菌性随着纳米粒子的添加呈上升趋势,在活性包装应用中具有极大潜力。以上研究结果将为大豆蛋白基薄膜的未来应用提供理论参考。
基金supported by the National Natural Science Foundation of China (Grant No. 51561031)the Natural Science Foundation of Guangxi Province (Grant No. 2015GXNSFBA139240)+1 种基金Open Foundation of Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Large Data Processing (Grant No. 2015CSOBD0102)the Highlevel Personnel Scientific Research Funds of Yulin Normal University (Grant No. G20150001)
文摘In view of the universality of the parallel connection of solar cells and their mismatch problem, in the present paper, we select two shunt solar cells (connected in parallel) as our research object, and use the equivalent one-diode circuit of the solar cell and the analysis of the two-body model. At first, the equations of current and voltage are deduced from the related electrical laws and the circuit diagram of the two solar cells connected in parallel. Then, according to the experimentally measured data of typical single-crystalline silicon solar cells (125 mm×125 mm), we select the appropriate simulation parameters. Following this, by using the photo-generated current, the shunt resistance, and the serial resistance of one of the shunt solar cells and the load resistance as independent variables, in turn, the changing characteristics of each branch current in the two shunt solar cells are numerically discussed and analyzed for these four cases for the first time. At the same time, we provide a simple physical explanation for the modeling results. Our analyses show that these parameters have different impacts on the internal currents of solar cells connected in parallel. These results provide a reference to solve the problem of connecting solar cells and to develop higher efficiency solar cells and systems. Meanwhile, the results will contribute to a better comprehension of the reasons for efficiency loss of solar cells and systems, and deepen the understanding of the electrical of solar cells behavior for high performance photovoltaic applications.
