Qualitative and quantitative assessment of interior moisture buffering by enclosures

The significance of interior humidity in attaining sustainable, durable, healthy and comfortable buildings is increasingly recognised. Given their significant interaction, any interior humidity appraisal requires a qualitative and/or quantitative assessment of interior moisture buffering. While the effective moisture penetration depth and effective capacitance models allow quantified assessment, their reliance on the ‘moisture penetration depth’ necessitates comprehensive material properties and hampers their application to multidimensional interior objects. On the other hand, while various recently suggested protocols for the simple and fast measurement of the moisture buffer potential of interior elements allow qualitative assessment, none of these are currently dependable for a wide range of moisture production regimes.In response to these flaws, this paper introduces the production-adaptive characterisation of the moisture buffer potential of interior elements and corroborates their superposition toward a room-enclosure moisture buffer potential. It is verified that this enables qualitative comparison of enclosures in relation to interior moisture buffering. It is moreover demonstrated that it forms an alternative basis for quantitative evaluation of interior moisture buffering by the effective moisture penetration depth and effective capacitance models. The presented methodology uses simple and fast measurements only and can also be applied to multimaterial and/or multidimensional interior elements.     

一款高性能时钟驱动器电路的设计

时钟器件芯片可以实现通信网定时同步、时钟产生、时钟恢复和抖动滤除、频率合成和转换、时钟分发和驱动等功能。在系统设计中,选用好的时钟驱动芯片,可以省去系统时钟树设计,既节省空间,又提高系统性能。介绍一款高性能时钟驱动器的集成电路设计方法,主要性能要求有:低传播延时、低输出偏斜、低输出抖动、抗电磁干扰能力、抗ESD能力,一一详述了达到各项要求的设计。     

Structural and opto-electrical properties of pyrolized ZnO-CdO crystalline thin films

A series of ZnO-CdO thin films of different molar ratios of Zn and Cd have been deposited on glass substrate at substrate temperature ~ 360 ℃ by the spray pyrolysis technique at an ambient atmosphere. X-ray diffraction (XRD) studies confirmed the polycrystalline nature of the film and modulated crystal structures of wurtzite (ZnO) and cubic (CdO) are formed. The evaluated lattice parameters, and crystallite size are consistent with literature. Dislocation density and strain increased in the film as the grain sizes of ZnO and CdO are decreased. The band gap energy varies from 3.20 to 2.21 eV depending on the Zn/Cd ratios in the film. An incident photon intensity dependent I-V study confirmed that the films are highly photosensitive. Current increased with the increase of the intensity of the light beam. The optical conductivity and the optical constants, such as extinction coefficient, refractive index and complex dielectric constants are evaluated from transmittance and reflectance spectra of the films and these parameters are found to be sensitive to photon energy and displayed intermediate optical properties between ZnO and CdO, making it preferable for applications as the buffer and window layers in solar cells.     

酵母常规透射电镜样品制备方法的比较与改进

透射电镜技术中前期样品制备是获得最接近样品真实结构信息的关键。本文选择酵母为观察对象,运用常规样品制备技术,观察不同缓冲液、不同脱水时间和脱水温度对酵母超微结构的影响,优化了酵母常规透射电镜前期制样方案。     

A reliable and sensitive time-resolved fluorescent immunochromatographic assay (TRFICA) for ochratoxin A in agro-products

Immunochromatographic assays (ICAs) are considered as a suitable diagnostic tool for the detection of mycotoxins. Mycotoxins and especially, ochratoxin A are analytes with more demanding sensitivity requirements. To enhance the sensitivity of current immunochromatographic assays for ochratoxin A (OTA), a novel sensitive ICA was developed in this study. In the assay, microspheres enclosing fluorescent europium (III) [Eu(III)] nanoparticles (EuNPs) were used as a label for OTA monoclonal antibody (OTA-mAb) conjugation. Accordingly, assay was called time-resolved fluorescent immunochromatographic assay (TRFICA). The test strip was composed of three parts: a sample pad, nitrocellulose membrane and an absorbent pad. As for detection, a proper concentration of conjugated microspheres was pipetted into the microtube and sample extract was added to it. Then the strip was inserted into the tube and the fluid flow along the strip. The TRFICA results were obtained in 8 min and read by a portable TRFICA strip reader. The established method allows quantitative determination of OTA with limit of detection as low as 1.0 μg kg⁻¹ in the samples. For validation, spiked samples including wheat, maize, soybean and rice were respectively assayed by TRFICA and a standard high performance liquid chromatography equipped with a fluorescence detector (HPLC-FLD), and good agreement of results was obtained between two methods.     

基于MoO3和Re-Bphen修饰有机太阳能电池性能的研究

有机太阳能电池(OSCs)的性能与材料及器件结构密切相关。以MoO3为阳极缓冲层,有机金属配合物Re-Bphen为阴极缓冲层,制备了结构为ITO/MoO3/CuPc/C60/Re-Bphen/Al的OSCs。在标准太阳光照条件下,当MoO3和Re-Bphen的厚分别为5nm和8nm时实现了器件的最佳性能,能量转换效率(PCE)和器件寿命均显著提高。结合器件结构,分析了工作机制。     

膨润土-砂混合型缓冲/回填材料研究现状与展望

高放废物处置中,膨润土-砂混合型缓冲/回填材料力学性质的研究对高放废物地下处置库的建设具有重要意义。在总结国内外缓冲/回填材料研究现状和成果基础上,该文认为试验仪器的研制、开发添加不同材料的混合材料、考虑高温-高压-高吸力条件的试验研究、模型试验、热-水-力-化耦合模型的建立和数值分析是今后一段时间内混合型缓冲/回填材料研究的重点。     

穿孔机顶杆循环装置液压控制系统的研究

设计穿孔机区域顶杆循环装置中顶杆小车油缸控制系统,对长行程高速重载液压系统油缸的速度、加速度、两腔液压力进行分析,对该类液压控制系统的运行机制、控制策略进行研究,进行了理论计算、仿真分析和实测验证,为类似工况液压控制系统的研究提供参考。     

高庙子膨润土及其混合材料导热性能研究

导热性能是高放废物地质处置库缓冲/回填材料的重要性能之一。采用瞬变平面热源法,研究了我国高放废物地质处置首选缓冲/回填材料高庙子膨润土,及以其为主料,添加不同含量石英砂、北山花岗岩碎屑组成的混合材料的导热性能。分析了添加剂种类和含量、干密度、饱和度等因素对导热系数的影响。研究结果表明:高庙子膨润土及其混合材料的导热系数、热扩散系数都随干密度和含水量的增大而增大;石英砂、北山花岗岩碎屑能够不同程度提高膨润土的导热系数,石英砂的作用优于北山花岗岩碎屑;饱和度对添加剂发挥其提高缓冲/回填材料导热性能的作用影响明显,饱和度越高,添加剂的作用越显著。     

用FXON-3A实现可编程控制器模拟量控制

介绍了可编程控制器模拟量控制系统,采用三菱公司可编程控制器扩展模块FXON-3A,完成可编程控制器模拟量的控制。从系统的线路设计,到缓冲寄存器的设置、零点/增益调整和程序的编制,详细叙述了工厂实际应用的具体方法。