Analysis of the detectivity for triple-layer heterojunction GaSb/GaInAsSb infrared detectors

In this paper, the detectivity is calculated and analyzed with the front-or backside illuminated case for both N-GaSb/p₂-Ga_0.8In_0.2As_0.19Sb_0.81/p₁-Ga_0.9In_0.1As_0.09Sb_0.91 and N₁-GaSb/n₂-Ga_0.9In_0.1As_0.09Sb_0.91/p-Ga_0.8In_0.2As_0.19Sb_0.81 infrared photovoltaic detectors, respectively. The analysis results show that the main absorption appears in the p-type Ga_0.8In_0.2As_0.19Sb_0.81 material with either front- or backside illuminated case for above two structures. In each structure, the carrier concentration obviously affects the detectivity. The carrier concentration in the wide-bandgap material for the isotype heterojunction should be reduced as low as possible to reduce the tunneling rate at the isotype heterointerface. Moreover, the change of the detectivity with the p-side surface recombination velocity for the N₁-n₂-p structure is more sensitive than that with the p₁-side surface recombination velocity for the N-p₂-p₁ structure. In the N-p₂-p₁ structure with the incident light from the p₁-side surface, two-color detection is achieved.     

Green preparation of Au nanoparticles for electrochemical detection of H2O2

A simple and green method for preparation of Au nanoparticles by reduction of HAuCl₄ using carbon nanodots as the reducing agent is reported. The carbon nanodots were prepared by a green method as well, using hydrothermal treatment of grass. It is observed that Au nanoparticles show obvious electrochemical catalytic ability for reduction of hydrogen peroxide, leading to its application of a high-performance non-enzymatic hydrogen peroxide sensor. The hydrogen peroxide sensor based on Au nanoparticles was made, with the detection limit at 23 μ M and linear range between 0.1-160 mM.     

复方苦槿霜抑制皮肤浅部真菌的试验研究

目的：通过抑菌试验观察复方苦槿霜的抑菌效果。方法：选择已经培养的常见皮肤浅部真菌菌落,分别取一小米粒大小菌块直接移植到药物培养基表面,如生长则测量菌落直径。观察1个月。结果：用药组和对照组部分菌落出现生长,且两组比较菌落直径大小相当。结论：复方苦槿霜对皮肤浅部真菌的抑制作用显著,其抑菌效果与达克宁霜相当。     

中国传统节日服饰色彩意蕴探究

节日服饰色彩作为节日的重要特征表现,反映了中华民族的精神风貌,也是节日的重要标志之一。在此期间,各民族的服饰通过色彩的装饰来表现出中国人重视节日、祈求美好生活的理想与信仰。中国文化与异质文化的冲击与接触带来了色彩应用上的丰富多彩和变化万千,同时,中国纺织技术的发挥和中华文化的灿烂成就了中华民族服饰的神韵和风采,也造就了中国传统节日与服饰之间相应成趣的关联。在现代的传统节日中,除了饮食文化和祭祀活动外,服装理应成为要体现出现代中国人的积极向上的时代特征与精神风貌,体现出传统节日的标志性、民族性、传承性、兼容性和时尚性。     

大流量低温差供热水系统节电运行方式分析

介绍了两种集中供热水系统流量旁通方式:设旁通管和混合水泵方式,并分析了两种方式与循环水泵功耗的关系.指出在不影响系统总流量的情况下,降低锅炉水流量比率,可以有效地降低水泵电耗.     

基于嵌入式Linux的IP电话系统

为解决噪声环境下的语音通讯问题,采用ARM、DSP和μClinux构成的嵌入式IP电话系统完成语音数据的采集、降噪和传输。分析了μClinux嵌入式操作系统下语音设备驱动程序的开发方法,重点介绍了组播技术及组播技术在IP电话会议功能中的软件实现。实验表明,采用10M以太网满足了本系统128kbit／s语音实时通信要求。     

HDR Experiments at Falkenberg/Bavaria

A test site for HDR experiments has been set up in granite in the Bohemian massif in east Bavaria. A large fracture was stimulated by hydraulic fracturing in a depth of 250 m. The orientation of the fracture was investigated by seismo-acoustic recording during the frac-experiments and by examining the fracture pattern initiated in the injection interval of the borehole by an impression packer and by acoustic televiewer measurements. Geoelectric measurements for fracture location at the surface were also tested before attempting to drill through the fracture. The fracture has now been intersected by 6 additional boreholes at distances between 2 m and 70 m from the initiation interval.According to the results of seismo-acoustic recording, temperature logging and acoustic televiewer measurements in the intersection boreholes, a single plane artificial fracture has been produced, striking E-W and dipping 50°S. The orientation of the fracture, which should be normal to the least compressive principal stress, and the value of the normal stress on the fracture are not consistent with the direction and the values of the principal stresses determined by wire line hydraulic fracturing stress measurements.Various hydraulic experiments were performed in the different boreholes to investigate the mechanical reaction of the fracture due to varying fluid pressure, the hydraulic properties of the fracture, the fluid losses and the heat exchange within the fracture. The models developed to interpret the results make it possible to translate the results to greater depth and higher flow rates.     

新型环氧树脂乳液改性水泥砂浆性能的研究

研究了环氧树脂乳液对水泥砂浆力学性能的影响，耐酸碱性的影响。采用电子扫描显微镜（SEM）分析了环氧胶乳网络结构与水泥砂浆的作用机理，以及环氧树脂乳液水泥砂浆微观结构形态。     

使用控制的可变性研究

在传统的访问控制模型和策略中虽有可变的特性,但属性的可变性是一个全新的概念。作为对传统访问控制的扩展,论述了使用控制模型,分析了其核心组成及特性。运用使用控制的观点,讨论了使用控制的可变性,定义了临时属性和永久属性两个可变属性。可变性是对相关主体和对象访问结果的属性更新处理,发生在授权和认证模型中,是通过在定义模型中加入更新过程实现的,使得基于历史的访问决策更容易实施。在属性可变性的基础上,进一步讨论了可变性的几种变化形式。