基于USB2．0的面阵CCD图像采集系统设计

设计了一种基于USB2.0的面阵CCD图像采集系统.简要介绍了系统的整体设计思路和各主要模块作用.选用复杂可编程逻辑器件作为硬件设计载体,使用Verilog HDL语言对驱动时序发生器进行编程.最后详细阐述了USB的软件框架.     

多通道超导量子干涉仪的自动控制系统

为了方便射频超导量子干涉仪(rfSQUID)的广泛运用,研制了多通道射频超导量子干涉仪自动控制系统,系统可完成对多路超导量子干涉仪工作点自动调整和存储,实现了对多通道rfSQUID有效信号的处理和输出。并对系统工作的原理、硬件电路和相关的软件设计作简要介绍。     

多通道声发射高速数据采集系统的研制

分析了声发射信号和常见声发射数据采集系统的特点,提出了一种基于USB2.0和CPLD构建的多通道高速声发射数据采集系统的方法。介绍了系统基本结构、工作原理以及其中信号放大、反混叠滤波、USB通信和CPLD逻辑实现部分。经实际测试与应用,该系统最高采样频率可达10 MHz,USB传输速率可达40 MB/s,且功耗较低、携带方便,可以满足对声发射信号的实时监测应用。     

Fe-2.0Cu合金连续冷却过程中Cu的析出行为

利用光学显微镜及高分辨透射电镜研究了Fe-2.0Cu合金连续冷却过程中的微观组织与沉淀析出,分析了不同冷速对沉淀析出的影响、硬度与组织及析出物三者之间的关系.结果表明,Fe-2.0Cu合金在连续冷却过程中,大量析出物以相间沉淀方式析出,随着冷却速度的增大析出物逐渐减少,对材料形成更强的强化作用.经过透射电镜能谱和衍射分析,确定析出物为富铜过渡相,这种富铜过渡相所形成的G.P区对合金起强化作用.     

Mathematical modeling of MILD combustion of pulverized coal

MILD (flameless) combustion is a new rapidly developing technology. The IFRF trials have demonstrated high potential of this technology also for N-containing fuels. In this work the IFRF experiments are analyzed using the CFD-based mathematical model. Both the Chemical Percolation Devolatilization (CPD) model and the char combustion intrinsic reactivity model have been adapted to Guasare coal combusted. The flow-field as well as the temperature and the oxygen fields have been accurately predicted by the CFD-based model. The predicted temperature and gas composition fields have been uniform demonstrating that slow combustion occurs in the entire furnace volume. The CFD-based predictions have highlighted the NO_x reduction potential of MILD combustion through the following mechanism. Before the coal devolatilization proceeds, the coal jet entrains a substantial amount of flue gas so that its oxygen content is typically not higher than 3-5%. The volatiles are given off in a highly sub-stoichiometric environment and their N-containing species are preferentially converted to molecular nitrogen rather than to NO. Furthermore, there exists a strong NO-reburning mechanism within the fuel jet and in the air jet downstream of the position where these two jets merge. In other words, less NO is formed from combustion of volatiles and stronger NO-reburning mechanisms exist in the MILD combustion if compared to conventional coal combustion technology.     

Modeling of a 120 kW chemical looping combustion reactor system using a Ni-based oxygen carrier

A modeling tool for the investigation of chemical looping combustion (CLC) in a dual circulating fluidized bed (DCFB) reactor system is introduced. CLC is a novel combustion process with inherent CO₂ separation, consisting of two fluidized bed reactors, an air reactor (AR) and a fuel reactor (FR). A solid oxygen carrier (OC) that circulates between the reactors, transports the necessary oxygen for the combustion. In the DCFB concept both AR and FR are designed as circulating fluidized beds (CFBs). Each CFB is modeled using a very simple structure in which the reacting gas is only in contact with a defined fraction of the well mixed solids. The solids distribution along the height axis is defined by a void fraction profile. Different parameters that characterize the gas-solids contact are merged into only one parameter: the fraction of solids exposed to the gas passing in plug flow (φ_s,core). Using this model, the performance of the 120 kW DCFB chemical looping combustor at Vienna University of Technology is investigated. This pilot rig is designed for a Ni-based OC and natural gas as fuel. The influence of the reactor temperatures, solids circulation rate, air/fuel ratio and fuel power are determined. Furthermore, it is shown that with the applied kinetics data, the OC is only fully oxidized in the AR when the AR solids inventory is much larger than the FR solids inventory or when both reactors are very large. To compare different reactor systems, the effect of the solids distribution between AR and FR is studied and both gas and solids conversions are reported.     

COSMO-RS modeling on the extraction of stimulant drugs from urine sample by the double actions of supercritical carbon dioxide and ionic liquid

This work presents the first research linking chemical engineering and sport science as far as we know. The COSMO-RS (conductor-like screening model for real solvents) model was used to make a priori prediction for the extraction of stimulants from aqueous solution by the double action of supercritical carbon dioxide (SC CO₂) and ionic liquid. It was found that the suitable ionic liquids should have small molecular volume, unbranched group and no sterical shielding effect around anion charge center, and thus [C₂MIM]⁺[OAc]^- is the best among all the ionic liquids investigated. The calculated results from the COSMO-RS model were qualitatively consistent with those from experiments. On this basis, partition coefficients of amphetamine (C9N) and nikethamide (C10N) between aqueous phase and supercritical fluid (or MTBE) phase at different temperatures were calculated. It was shown that the separation efficiency of supercritical extraction with ionic liquid is generally higher than that of traditional liquid-liquid extraction. The modeling present can also be extended to the separation of trace amount of organic substances from aqueous solutions for other purposes.     

信息化2.0时代服装制版人才培养模式创新研究

在教育信息化2.0时代背景下,构建基于MOOC平台与混合式学习的服装制版人才培养模式,既要有传统课堂教学的精髓,又要结合现代信息化教学理念,运用翻转课堂、线上线下、课内课外、现场与虚拟等多种方式及方法,达到全方位、立体化培养应用型和创新型服装制版人才,为高质量的服装制版人才培养提供新思路。     

MIDP类库的设计和实现原则

ORP（Open Runtime Platform）是一个高性能的MRTE（Managed Runtime Environment）软件开发环境,MIDP（Mobile Information Device Profile）是我们作为ORL（Open Runtime Library）的一部分在该环境中开发的类库。在开发该类库的时候要充分考虑类库的整体设计和性能。我们在编写的过程中,总结出了一些关于如何设计和实现有关MIDP类库的经验,并给出了具体实例来阐述其中需要注意的一些原则。     

在Whidbey中构建基于MySQL的成员提供者

介绍了ASP．NET2．0提供的成员服务,构建了一个基于MySQL数据库的成员提供者,使得开发者能够利用MySQL数据库,在Whidbey中简单、高效地开发身份验证和成员管理Web应用。