不同冲击间隔分布下经典δ冲击模型的参数估计1

通过极大似然估计方法,对冲击时间间隔服从[0, b]上均匀分布、参数为λ的指数分布以及一般更新过程的经典δ冲击模型的参数δ、λ和b进行估计,得到了其相应的估计量。     

The electrodeless discharge lamp: a prospective tool for photochemistry: Part 3. The microwave photochemistry reactor

A simple and original microwave photochemical reactor is described in detail. It consists of an electrodeless discharge lamp placed into the reaction vessel in a modified domestic microwave oven. The microwave field generates ultraviolet radiation by the lamp at the same time when it interacts with the reaction mixture. The construction, experimental set-ups, applications, and safety precautions are discussed.     

基于准等重二甲基化标记的高通量蛋白质组选择性交叉标记装置

面对生物学及精准医学等领域多变量、大样本量的蛋白质组定量分析的需求,高通量的定量标记及分析已经成为近年来蛋白质组学方法发展的趋势。发展了一种基于准等重二甲基化标记策略的高通量肽段末端选择性交叉标记装置（pIDL-StageTip）,借助简单的装置及离心力,有效地增加了定量标记的通量,并保证了肽段末端两步标记反应时间的可控性及操作的简便性。通过优化酸性条件下NaBD₃CN与NaBH₃CN体系的标记条件,得到了标准蛋白质酶解产物100%的标记效率、95%以上的标记选择性;在人源蛋白质组复杂体系下,标记效率大于99%,标记选择性为100%。基于该装置的定量方法具有很高的定量准确度及精密度。该装置为实现高可操作性、高准确度、高通量的蛋白质组定量标记提供了一个可靠的解决方案。     

A simple hollow fiber renewal liquid membrane extraction method for analysis of sulfonamides in honey samples with determination by liquid chromatography–tandem mass spectrometry

A sensitive and precise analysis using hollow fiber renewal liquid membrane (HFRLM) extraction followed by high performance liquid chromatography–tandem mass spectrometry (LC–MS/MS) is described for determination of five sulfonamides in honey samples. In this procedure, the organic solvent introduced directly into the sample matrix extracts the sulfonamides and carries them over the polypropylene porous membrane. An organic solvent is immobilized inside the polypropylene porous membrane, leading to a homogeneous phase. The stripping phase at higher pH in the lumen of the membrane promotes the ionization of the target compounds releasing them to this phase. The most important parameters affecting the extraction efficiency were optimized by multivariable designs (pH and sample mass, pH and buffer for stripping phase, extraction temperature and time, type and volume of extractor solvent and use of salt to saturate the sample). Detection limits in the range of 5.1–27.4 μg kg⁻¹ and linearity coefficient of correlation higher than 0.987 were obtained for the target analytes. The results obtained for the proposed method show that HFRLM–LC–MS/MS can be used for determination of the five sulfonamides studied in honey samples with excellent precision, accuracy, practicality and short analysis time.     

Processing and properties of engineering plastics recycled from waste electrical and electronic equipment (WEEE)

The characteristics of engineering plastics used in the preparation of electrical and electronic equipment were studied. More specifically, their thermal response was recorded by DSC experiments, the rheological properties were investigated via MFI tests and the mechanical properties were evaluated with tensile tests. The aim was to establish a procedure for recycling the same engineering plastics deriving from waste of electrical and electronic equipment (WEEE), which offers the additional advantage of using the as-received waste stream as a recyclable mixture, i.e. without sorting and classification of its components.The experimental results showed that blends of PC with ABS or ABS/HIPS can be prepared by direct mixing and this, would allow easy handling of the engineering plastics coming from WEEE, i.e. blending without the need of sorting. These mixtures can be easily processed and display acceptable mechanical properties with reasonable cost. Therefore, the processing characteristics and properties of the systems studied in this work could be the key for the design of an interesting approach for handling solid plastic waste from electrical and electronic devices.     

军校大学化学创新实验课:VCI技术在装备储存中的应用

将经过实际应用验证的科研成果--气相缓蚀技术设计成军队院校开设的大学化学课程实验。该实验涉及武器装备存储中的问题与需求和气相缓蚀技术的工作原理、优势以及配方筛选基本原则,并介绍了该实验的具体课堂实施环节。通过本实验的开设,期望达到预定的各层次教学目标,提高军校人才培养质量。     

除硅沉降罐流场分析

为提高盐酸酸洗液回收氧化铁粉的品质,酸洗系统通常都设置有除硅系统,而沉降罐是该系统的一大关键设备．利用CFD（计算流体动力学）的专业分析软件Fluent,针对沉降罐内部结构（进料口的直径和浸入深度）对流场规律的影响进行了理论分析;最后综合考虑对沉降效果的影响提出了不同的进料管在液体内的浸入深度合理值,以及应适当地增大沉降罐进料口管径的改进措施．     

静电纺丝法和气流-静电纺丝法制备聚砜纳米纤维

应用电纺法制备了聚砜纳米纤维.设计了一种新型的气流静电纺丝装置,其特点是在喷丝头上添加了喷气组件.电纺过程中所用聚砜的特性粘数为0.97dLg,溶剂为二甲基乙酰胺,载气为氮气.研究了聚砜纳米纤维的平均直径与过程参数之间的关系.研究表明影响聚砜纳米纤维的平均直径的主要因素为电压、纺丝液的流速、喷丝头与收集器之间的距离、操作温度以及纺丝液的性质(如粘度、表面张力和电导率).纳米纤维的平均直径和直径分布用扫描电镜表征.应用这种气流静电纺丝法制备的纳米纤维的直径范围是50～500nm.所得纳米纤维的直径依赖于电压、喷丝头与收集器之间的距离以及喷丝液的浓度.结果表明,采用气流静电纺丝不仅能制备较细而且均匀的纳米纤维,而且产量更高.     

Diffusion-averaged molecular weights of «nonboiling» crude oil fractions

Summary The successful application of the formerly presented concept of diffusion-averaged molecular weight, M_d, to vacuum residues of crude oils, or their fractions, is described. The samples for establishing the calibration curve, logDvs. logM, were crude oil fractions with polydispersities smaller than 1.1. In a surprisingly good approximation the calibration curve is independent of the origin of these fractions if 500<M<10000. The validity of our calibration curve was demonstrated with more than 10 crude oil residues and with some of their hydrogenation residues [2].     

高效大面积有机白光照明研究及其展望

白光有机发光二极管(OLED)是新一代健康节能照明光源,光效性能已超过荧光灯水平。自从OLED技术问世以来,研究人员陆续开展了关于OLED照明的研究工作。本文介绍了OLED照明的特点,以及国内外OLED照明发展现状,讨论了发展OLED照明技术和装备国产化所亟待解决的重大难题和面临的挑战,重点论述了发展高效大面积OLED照明器件制备技术及推动OLED照明产业化的重要意义。