半导体产业有助于绿色的太阳能制造

光伏产业不仅需要努力达到电网平价(实现成本与传统发电成本相当),同时它也必须保持一套对环境无害的生产方式,从而不会抵消太阳能作为清洁能源的好处。     

基于STM32的便携式二氧化碳监测仪设计

针对二氧化碳地质储存地区环境中CO2浓度监测,基于STM32F103RE微控制器,设计了一款便携式二氧化碳监测仪,在RS232协议下,实现微控制器与传感器、液晶显示模块、U盘存储模块的数据通讯,系统中选用三个红外吸收型二氧化碳传感器,由继电器控制电路切换三个通道,实现分档采集数据,最后利用监测仪进行了室内CO2气体浓度测试实验,实验结果证明三个数据采集通道工作正常。     

Control of sonoluminescence signal in deionized water using carbon dioxide

Megasonic cleaning is routinely employed in semiconductor industry for cleaning of wafers. However, the method also results in damage to wafer features and such damage has been proposed to arise from transient, imploding cavities formed during megasonic processing. Transient cavitation is associated with the release of light, a phenomenon called sonoluminescence (SL) and the extent of damage has been shown to correlate with the intensity of SL. Control of sonoluminescence may therefore allow control of damage during megasonic processing of wafers. In this study, the ability of carbon dioxide to quench sonoluminescence generation in deionized water exposed to megasonic field of varying power density and duty cycle has been systematically investigated. It has been found that CO₂ is not only incapable but also a potent inhibitor of sonoluminescence, providing a potential means for selective alleviation of the violent effects of transient cavitation in process fluids. A novel chemical method has been established for in situ release of CO₂ from NH₄HCO₃ through a pH induced shift in the carbonic acid equilibria in deionized water. Using this method, a precisely controlled, progressive decrease in SL of air saturated deionized water through addition of NH₄HCO₃ has been demonstrated. It has been determined that 130 ppm of released CO₂ is sufficient for complete inhibition of sonoluminescence generated in air saturated deionized water.     

Tin dioxide buffer layer-assisted efficiency and stability of wide-bandgap inverted perovskite solar cells

Inverted perovskite solar cells (IPSCs) have attracted tremendous research interest in recent years due to their applications in perovskite/silicon tandem solar cells. However, further performance improvements and long-term stability issues are the main obstacles that deeply hinder the development of devices. Herein, we demonstrate a facile atomic layer deposition (ALD) processed tin dioxide (SnO₂) as an additional buffer layer for efficient and stable wide-bandgap IPSCs. The additional buffer layer increases the shunt resistance and reduces the reverse current saturation density, resulting in the enhancement of efficiency from 19.23% to 21.13%. The target device with a bandgap of 1.63 eV obtains open-circuit voltage of 1.19 V, short circuit current density of 21.86 mA/cm², and fill factor of 81.07%. More importantly, the compact and stable SnO₂ film invests the IPSCs with superhydrophobicity, thus significantly enhancing the moisture resistance. Eventually, the target device can maintain 90% of its initial efficiency after 600 h storage in ambient conditions with relative humidity of 20%–40% without encapsulation. The ALD-processed SnO₂ provides a promising way to boost the efficiency and stability of IPSCs, and a great potential for perovskite-based tandem solar cells in the near future.     

The Effect of Methyl Functionalization on Microporous Metal‐Organic Frameworks' Capacity and Binding Energy for Carbon Dioxide Adsorption

The design, synthesis, and structural characterization of two new microporous metal‐organic framework (MMOF) structures is reported; Zn(BDC)(DMBPY)_0.5·(DMF)_0.5(H₂O)_0.5 (1; H₂ BDC = 1,4‐benzenedicarboxylic acid; DMBPY=2,2′‐dimethyl‐4,4′‐bipyridine) and Zn(NDC)(DMBPY)_0.5·(DMF)₂ (2; H₂NDC = 2,6‐naphthalenedicarboxylic acid, DMF=N,N,‐dimethylformamide), which are obtained by functionalizing a pillar ligand with methyl groups. Both compounds are 3D porous structures of the Zn₂(L)₂(P) type and are made of a paddle‐wheel Zn₂(COO)₄ secondary building unit (SBU), with the dicarboxylate and DMBPY as linker (L) and pillar (P) ligands, respectively. Comparisons are made to the parent structures Zn(BDC)(BPY)_0.5·(DMF)_0.5(H₂O)_0.5 (3; BPY = 4,4′‐bipyridine) and Zn(NDC)(BPY)_0.5·(DMF)_1.575 (4) to analyze and understand the effect of methyl functionalization. CO₂‐adsorption studies indicate substantially enhanced isosteric heats of CO₂ adsorption (Q_st) for both compounds, as a result of adding methyl groups to the BPY ligand. The CO₂ uptake capacity, however, is affected by two opposing and competing factors: the enhancement due to increased MMOF–CO₂ interactions (higher Q_st values) and detraction due to the surface area and pore‐volume reduction. For 1′ (the guest‐free form of 1), the positive effect dominates, which leads to a significantly higher uptake of CO₂ than that of its parent structure 3′ (the guest‐free form of 3). In 2′ (the guest‐free form of 2), however, the negative effect rules, which results in a slightly lower CO₂ uptake with respect to 4′ (the guest‐free form of 4). All four compounds exhibit a relatively high separation capability for carbon dioxide over other small gases, including CH₄, N₂, and O₂. The separation ratios of CO₂ to O₂ and N₂ (at 298 K and 1 atm) are 39.8 and 23.5 for compound 1′, 57.7 and 40.2 for 2′, 25.7 and 29.5 for 3′, 89.7, and 20.3 for 4′, respectively. IR and Raman spectroscopic characterization of CO₂ interactions with 1′ and 2′ provides indirect support of the importance of the methyl groups in the interaction of CO₂ within these systems.     

基于可调谐半导体激光吸收光谱的CO检测仪设计

为了能够实时检测出矿井下一氧化碳(CO)浓度,减少煤矿中毒事件,设计了采用可调谐半导体激光器的CO检测仪。采用波长调制光谱(WMS)与可调谐二极管激光吸收光谱(TDLAS)相结合的气体检测技术,将检测信号从低频区域搬到高频区域,然后采用相关技术完成谐波信号的提取,从而检测出CO浓度。实验结果表明,检测下限达到12ppm,能够检测矿井下CO浓度。     

新能源并网控制器测试仿真平台及设计实现研究

本文提出一种新能源并网控制器测试仿真平台设计方案,用于并网控制器的性能检测.测试仿真平台提供电力电子与电力系统模型库以及专门的针对电力系统的实时解算方法,结合灵活的I/O接口,可实现并网控制器与电力系统的硬件在环实时仿真.该平台能使实验参数的修改变得简便,通过修改仿真模型就能进行多种工况的实验,具有一定的实用价值.     

财务管理信息化平台在中小型煤炭企业中的架构设计

财务管理对于中小型煤炭企业不能仅仅是传统的记账,而应该作为企业运营的重要成员参与到企业建设中去,因此,财务管理的信息化就变的越来越重要,财务管理信息化平台就是针对财务管理的现代化,信息化而设计的专门应用于中小型煤炭企业的财务管理平台。     

基于Web的油气资源评价软件实现

传统的油气资源评价软件以单机版为主,文中提出了基于Web的油气资源评价软件的主要架构,应用ExtJS技术、Ajax技术实现了基于Web的非参数发现序列评价软件及USGS非常规评价软件,并为多用户并发访问建立了多用户并发平台.基于Web的油气资源评价软件实现了将评价参数信息、评价计算及评价结果信息提交Oracle数据库,该研究为进一步开发油气资源评价软件打下了基础.