真空管道TiN膜热出气率实验研究

简要叙述了小孔流量法测量材料出气率实验的原理和实验装置，给出了不锈钢溅射镀TiN膜在不同情况下的热出气率，并对影响不锈钢溅射镀TiN膜热出气率情况的各种因素进行了分析，为使用溅射镀TiN膜表面处理的储存环真空室的设计提供了依据。     

基于半导体制冷的动态不规则物体降温

目前便携式电子降温设备大多针对处于静态的对象。本文研究半导体对于具有不规则外表并可能实时变换空间位置的物体进行降温的可行性，试验综合考虑了储水箱的起始水温、水循环流量、风冷散热功率等因素，并提出了这类设备的适用范围。     

Take care! The evaluation of a team-based burnout intervention program for oncology care providers.

In this quasi-experimental study among staff of 29 oncology wards, the authors evaluated the effects of a team-based burnout intervention program combining a staff support group with a participatory action research approach. Nine wards were randomly selected to participate in the program. Before the program started (Time 1), directly after the program ended (Time 2), and 6 months later (Time 3), study participants filled out a questionnaire on their work situation and well-being. Results of multilevel analyses showed that staff in the experimental wards experienced significantly less emotional exhaustion at both Time 2 and Time 3 and less depersonalization at Time 2, compared with the control wards. Moreover, changes in burnout levels were significantly related to changes in the perception of job characteristics over time. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Photonic-crystal surface-emitting laser near 1.55 /spl mu/m on gold-coated silicon wafer

An InP/InGaAs-based photonic band-edge laser bonded on silicon operating near 1.55 mum is presented. A gold reflector positioned below the slab containing the active layer reduces the optical losses of the Bloch-mode resonator. As a result, a quality factor exceeding 8000 is obtained at transparency leading to a laser threshold as low as 3.4 muJ/cm²     

Conducted EMI Reduction in Power Converters by Means of Periodic Switching Frequency Modulation

Spread spectrum clock generation techniques were originally developed to reduce electromagnetic interference (EMI) in communications and microprocessor systems working in the range of hundreds of megahertz. Nowadays, the switching frequency of power converters has been increasing up to values that make worthy the application of such switching frequency modulation techniques to reduce EMI emissions in power converters. Although random modulations have been applied before to power converters, periodic patterns can provide some advantages. First, theoretical principles of frequency modulation using three periodic patterns for the modulating function are presented. The influence of some important modulation parameters on the EMI reduction is analyzed and some considerations about the EMI filters design are also presented. The effectiveness of such methods in terms of EMI reduction is demonstrated theoretically and confirmed with experimental results obtained from tests carried out on two converters. The first one is a 2.5 W buck converter that can be switched up to 1 MHz and the second one is a 600 W boost converter switching at 40 kHz. In both cases, attenuations obtained in conducted EMI are evaluated. Finally, special attention has been paid to input current and output voltage ripple in order to evaluate possible undesired side-effects produced by this technique.     

Low-Complexity High-Rate Reed--Solomon Block Turbo Codes

This letter considers high-rate block turbo codes (BTC) obtained by concatenation of two single-error-correcting Reed-Solomon (RS) constituent codes. Simulation results show that these codes perform within 1 dB of the theoretical limit for binary transmission over additive white Gaussian noise with a low-complexity decoder. A comparison with Bose-Chaudhuri-Hocquenghem BTCs of similar code rate reveals that RS BTCs have interesting advantages in terms of memory size and decoder complexity for very-high-data-rate decoding architectures.     

多用户OFDM系统中高效的资源分配算法

在多用户正交频分复用（MU-OFDM）系统中，为了降低系统性能损失和最小化总发射功率，文中提出了一种改进的、具有自适应能力的高效子载波分配和功率分配算法。该算法具有更好的性能和近似于已有算法的计算复杂度，而且通过仿真结果得到了证明。     

地沟油的污染及变质情况研究

研究了地沟油的污染及变质情况。检测了地沟油的酸价、碘价、过氧化值、折光指数、熔点五项指标，结果远远偏离正常食用油范围；采用电感耦合等离子体质谱（ICP—MS）检测地沟油中15种微量元素，发现Fe、Pb、Cr、Zn、Mn在地沟油中含量明显超出食用油；采用气相色谱质谱联用（GC—MS）方法测定地沟油的挥发性物质（≤80℃），共鉴定了44种化合物，占总组分的99．46％，其中相对含量最高的是油脂水解氧化产物D-甘油酸，此物质在食用油中未被检出。     

基于动态扩展算法的大型燃煤机组非线性协调控制系统设计

为了从根本上解决单元机组在大范围变工况时的协调控制问题，克服非线性特征对系统控制品质的影响，论文应用反馈线性化原理，对大型燃煤机组的协调控制问题进行了直接非线性控制的研究。针对被控对象的特点，引入相对阶向量的动态扩展算法，得到了单元机组简化非线性模型的输出反馈控制律，该控制律可以实现全局意义下的精确反馈线性化，对线性化变换有定义的整个区域都是适用的；针对反馈线性化律作用下的伪线性系统，设计了二自由度I-PD控制结构，简单而有效地解决了伪线性系统对扰动敏感、鲁棒性差的问题，确保输出变量的精确跟踪。通过比较系统闭环传递函数与期望传递函数的对应项系数，可以方便整定出控制器参数。求得的控制器由比例或积分环节构成，形式简单，便于工程实现。在500MW燃煤机组非线性模型上的仿真试验证明了该协调控制系统的负荷跟踪能力、抗干扰性能及鲁棒性。     

基于清洁发展机制的需求侧管理减排晕的额外性探讨

清洁发展机制（CDM）是一项基于发达国家温室气体减排义务之上的发达国家和发展中国家的合作机制．目前已在国际上已得到广泛应用。介绍了CDM的概念和相关CDM项目开发的知识，在设置了合理的基准线情况下．对判断当前电力市场环境下需求侧管理能否成为CDM项目的关键问题——气体减排量的额外性．用一种可再生能源发电并网的统一监测方法学ACM0002进行了论证。