密闭空间非金属材料VOC散发特性研究进展

介绍非金属材料VOC散发特性研究的进展及常见的经验模型和理论模型,并分析和探讨了密闭空间非金属材料VOC散发特性的研究现状,提出了有利于构建密闭空间非金属材料VOC散发模型的建议。     

某常用胶合板VOC散发的试验研究

针对目前人居建筑和空调客车内装修常用的5mm木质胶合板,采用大环境舱模拟实际空调环境研究其甲醛的散发,并对处于稳定散发期的胶合板研究了环境因素对其VOC散发的影响,同时作了VOC化学成分的检测。研究结果有利于人们对胶合板释放污染物的正确认识和正确使用人造胶合板。     

室内挥发性有机化合物(VOC)污染的研究

回顾了国内外对挥发性有机化合物(VOC)的研究，分析了VOC的剂量-反应关系，阐述了国内在测定含VOC材料方面以及对室内VOC检测技术方面存在的问题和不足，为今后的研究打下了基础。     

我国建筑物中的VOC及防治

本文介绍了建筑中按挥发性有机化合物的危害及我国存在的问题，并从建筑和装修材料的角度分析了VOC的来源，而且给出了室内环境对VOC扩散的影响，最后介绍了降低室内VOC的方法。     

洁净室散发的VOC的特性与测量

现代半导体洁净室中，生产过程所产生的有机挥发物（VOC）已成为影响产品品质的关键问题之一。本文对洁净室里VOC的来源进行了分析，并对人体和洁净室结构材料产生的VOC的特性和测量方法进行了讨论。     

基板表面涂层的比较

我认为目前基板表面涂覆（涂层)材料仍没有理想的产品。每种表面涂覆材料都有其各自的缺点，因而不能够满足所有的应用需求。应该对各种表面涂覆材料在应用中的优缺点加以比较，本文以12项技术因素为基础，对5种表面涂覆材料进行了比较．并根据我本人的经验对每种材料的各因素标注了加号（优点)或减号(缺点)。这12项因素包括：     

纳米光催化材料在功能性空气过滤材料中的应用研究

介绍了纳米光催化材料光解室内空气中挥发性有机化合物（VOC）的原理及在国内外功能性空气过滤材料领域的研究应用情况，为室内空气净化的研究及室内空气净化器的开发奠定了基础。     

纳米胆甾型液晶材料的合成

经缩聚反应合成了纳米胆甾型液晶材料，通过改变手性组分含量、手性化温度以及调节分子间纳米级螺距，使聚合物表现出不同的光学和波谱性能，制备出了随入射光的入射方向和观察方向不同而色彩变化、表面均匀的样品。实验表明，该材料在印刷、装饰、防伪等领域有广阔的应用前景。     

用轻质材料制作收录机流转工位器具

用轻质材料制作收录机流转工位器具常州无线电总厂杨为正吴其兴（２１３００１）在收录机生产流水线上，必须有大量的流转工位器具，以保证在整个流转过程中，已装饰好的收录机机壳表面不被擦伤。在时间紧任务重的情况下，我们做了大量的工作，经反复试验，用轻质材料快速...     

ICALEO年会谈论的激光加工时髦话题

超短激光脉冲(Sps以下)材料加工处理是ICALEO’98年会200多篇论文的一个主题。在由美国激光研究所主办的会议上,所讨论的其它研究主题包括激光表面装饰与快速做加工成型二极管激光加工、表面处理、焊接和医用器件制造等。劳伦斯·利夫莫尔国家实验室激光科学与技术项目的副主席主管Michael Perry发表了重要演说。Perry和他的同事首先采用超短脉冲激光器用于材料加工并研制出第一台工业化飞秒激光加工机。因此,该加     

高架火炬排放光学遥测技术的研究进展

在石化工业中,高架火炬是一种用于燃烧上游生产过程中产生的废气的重要装置。然而火炬运行时通常存在不完全燃烧现象,主要表现为以下两种形式：（1）由于热值低引起的未燃烧的可挥发性有机物(Volatile Organic Compounds, VOC)排放;（2）由于空气不足引起的黑烟排放。近年来,火炬工业领域开始尝试用光学方法对其燃烧状态进行遥测。介绍了高架火炬排放中采用的几种光学监测技术,包括被动式傅里叶变换红外(Passive Fourier Transform Infrared, PFTIR)光谱技术、中红外超光谱相机监测技术、自然光消光法(Line-Of-Sight Attenuation using Sky-light, Sky-LOSA)和双波长红外传感器监测技术,并从基本原理、应用和进展等方面对其进行了阐述。最后对光学遥测在高架火炬领域的技术发展和应用前景进行了分析。     

A comparative study of control techniques for PWM rectifiers in AC adjustable speed drives

Four control techniques for pulse-width modulation (PWM) rectifiers in AC adjustable speed drives are presented. In particular, the so-called virtual-flux oriented control (VFOC) and virtual-flux based direct power control (VF-DPC) schemes are described and compared with their voltage based counterparts. These are the voltage oriented control (VOC) and voltage-based direct power control (V-DPC) techniques. Theoretical background is provided, and results of computer simulations and laboratory experiments are given, documenting advantages and disadvantages of the individual control strategies.     

Conversion efficiency of strained wurtzite InxGa1-x N/ZnSnN2 core/shell quantum dot solar cells under external electric field

In this study,the conversion efficiency(CE),open-circuit voltage(V_OC) and short-circuit current density(J_SC) of wurtzite In_xGa_1-xN/ZnSnN₂ core/shell quantum dot(QD) solar cells are studied by using the detailed balance model.The effects of strain and external electric field have been considered.The results show that with the increase of the core size,the V_OC increases,while the J_SC and CE decrease.With the increase of s...     

Sensing of Vaporous Organic Compounds by TiO2 Porous Films Covered with Polythiophene Layers

This paper describes the detection of volatile organic compounds (VOCs) through analyses of two output signals from integrated microcantilever sensor arrays coated with organic‐inorganic hybrid sensing layers. The surface of TiO₂ porous films was modified by amphiphilic terthiophene monomers and the adsorbed monomers were polymerized at the surface of TiO₂ nanoparticles. The TiO₂ porous films covered with polythiophene layers worked as highly sensitive sensing interfaces to provide two output signals for weight and resistance changes during exposure to VOC vapor. When the TiO₂ porous films onto the sensor arrays were dyed with various kinds of amphiphilic monomers with different substituents, the resulting films provide exact information on VOC concentration from the mass changes as well as VOC classification from the analyses of response patterns.     

Simulation of double junction In0.46Ga0.54N/Si tandem solar cell

A comprehensive study of high efficiency In_0.46Ga_0.54N/Si tandem solar cell is presented. A tunnel junction (TJ) was needed to interconnect the top and bottom sub-cells. Two TJ designs, integrated within this tandem: GaAs(n⁺)/GaAs(p⁺) and In_0.5Ga_0.5N(n⁺)/Si(p⁺) were considered. Simulations of GaAs(n⁺)/GaAs(p⁺) and In_0.5Ga_0.5N (n⁺)/Si(p⁺) TJ I-V characteristics were studied for integration into the proposed tandem solar cell. A comparison of the simulated solar cell I-V characteristics under 1 sun AM1.5 spectrum was discussed in terms of short circuit current density (J_sc), open circuit voltage (V_OC), fill factor (FF) and efficiency (η) for both tunnel junction designs. Using GaAs(n⁺)/GaAs(p⁺) tunnel junction, the obtained values of J_sc = 21.74 mA/cm², V_OC= 1.81 V, FF = 0.87 and η = 34.28%, whereas the solar cell with the In_0.5Ga_0.5N/Si tunnel junction reported values of J_sc = 21.92 mA/cm², V_OC = 1.81 V, FF = 0.88 and η = 35.01%. The results found that required thicknesses for GaAs(n⁺)/GaAs(p⁺) and In_0.5Ga_0.5N (n⁺)/Si(p⁺) tunnel junctions are around 20 nm, the total thickness of the top InGaN can be very small due to its high optical absorption coefficient and the use of a relatively thick bottom cell is necessary to increase the conversion efficiency.     

Dendrimer‐Based,High‐Luminescence Conjugated Microporous Polymer Films for Highly Sensitive and Selective Volatile Organic Compound Sensor Arrays

Conjugated microporous polymers (CMPs) are attracting increasing attention in chemical sensing due to their extended π‐conjugated framework, permanent microporous structure, and large specific surface area. However, the extremely poor solubility and processability of CMPs, as well as the serious fluorescence quenching caused by aggregation, restrict their practical applications. Herein, a high‐luminescence CMP film is constructed based on a novel dendrimer (TPETCz) featured by its central tetraphenylethylene “core” with aggregation‐induced emission effect and its highly electro‐active “branches.” High specific surface area CMP films for analyte diffusion are fabricated by a facile in situ electropolymerization method. These dendrimer‐based CMP films exhibit superior sensitivity to volatile organic compounds (VOCs). More importantly, 18 types, the most types reported, of VOC vapors are precisely distinguished by the linear discriminant analysis by establishing a 2D fluorescence sensor array based on the CMP films and the dendrimer monomer films.     

化合物半导体的THz发射光谱

利用反射式太赫兹（THz）辐射产生与探测系统，研究了基于不同半导体的THz发射光谱. 通过快速傅里叶变换，由测得的THz时域光谱得到了其相应的频域光谱，从而对不同半导体的THz发射性质进行了比较. 结果表明，未掺杂的砷化铟(InAs)较其他半导体材料有更高效的THz发射效率.     

Superfluorescence dynamics in 130Te2

High-resolution analysis results are presented for Te₂ superfluorescence induced by short pulses from a YAG-pumped dye laser pulses, and a comparison is made with CW-laser-induced fluorescence observed by Fourier transform spectroscopy. A complete identification of the transitions involved, based on intensity measurements and supported by calculated Franck-Condon factors, has been achieved. The cooperative emission in Te₂ has been studied by time resolved spectroscopy as a function of density. With increasing density or temperature of the sample, the emission changes continuously from characteristic spontaneous emission to superfluorescence. The evolution of the time characteristics of the signal with the number of partners are presented and compared with the predictions of current theories