排序方式: 共有54条查询结果,搜索用时 734 毫秒
51.
珠算式心算即珠脑速算,是指让孩子的视觉、听觉、触觉及整个肌体,神经都能得到立体训练。它具有三大功能。计算功能;教育功能;启智功能。有助于孩子的智力发展,也促进脑神经发展,发掘大脑的潜力。培养儿童的综合能力,它是从应试教育向素质教育转变的最佳途径之一。 相似文献
52.
Reveal the large open-circuit voltage deficit of all-inorganicCsPbIBr2 perovskite solar cells
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Due to excellent thermal stability and optoelectronic properties, all-inorganic perovskite is one of the promising candidates to solve the thermal decomposition problem of conventional organic—inorganic hybrid perovskite solar cells (PSCs), but the larger voltage loss (Vloss) cannot be ignored, especially CsPbIBr2, which limits the improvement of efficiency. To reduce Vloss, one promising solution is the modification of the energy level alignment between the perovskite layer and adjacent charge transport layer (CTL), which can facilitate charge extraction and reduce carrier recombination rate at the perovskite/CTL interface. Therefore, the key issues of minimum Vloss and high efficiency of CsPbIBr2-based PSCs were studied in terms of the perovskite layer thickness, the effects of band offset of the CTL/perovskite layer, the doping concentration of the CTL, and the electrode work function in this study based on device simulations. The open-circuit voltage (Voc) is increased from 1.37 V to 1.52 V by replacing SnO2 with ZnO as the electron transport layer (ETL) due to more matching conduction band with the CsPbIBr2 layer. 相似文献
53.
We investigate the single-event two-pion correlation functions for the hydrodynamic particle-emitting sources with the fluctuating initial conditions generated by the Heavy Ion Jet Interaction Generator (HIJING). Using a three-dimension fast Fourier transform (FFT), we further extract the source functions from the single-event correlation functions. It is found that the inhomogeneity of the hydrodynamic sources with the fluctuating initial conditions lead to event-by-event fluctuations of the correlation functions and source functions. 相似文献
54.