用于中子发生器的小型ECR离子源设计

介绍了用于中子发生器的小型ECR(电子回旋共振)离子源的工作原理、基本结构和预期技术指标。叙述了该系统的设计过程、关键技术和创新点。     

浅谈中压固体绝缘环网柜技术及试验

固体绝缘环网柜的绝缘材料及结构设计、固体绝缘技术方面进行讨论,指出了中压固体绝缘环网柜在中压领域的优势。     

微型实验的开发与研究——分析专业常规实验微型化

以常规实验的微型化为切入点,目的在于改进分析实验教学方法、实验教学内容,将环境教育与技能培养相结合,以实践教学为载体,以倡导整合、优化实验教学过程为重心,开展教育活动,培养和提高学生实验操作、观察、思维等能力,以有效提高分析专业实验教学质量。     

微型化离子迁移谱仪研究进展

离子迁移谱技术（iMS）是从上世纪70年代发展起来的一项痕量气态物质探测技术。基于该技术的离子迁移谱仪具有结构简单,检测速度快、可以工作在大气环境下等优点,在微型化便携式应用中有巨大的发展潜力。通过参考国内外相关文献,着重从离子源、高场非对称离子迁移谱技术（FAIMS）和离子捕获装置三个方面对微型化离子迁移谱仪的研究现状进行了分析和探讨,并对该领域未来的研究方向和发展趋势提出了一些看法。     

Designing a miniaturized photoacoustic sensor for detecting hydrogen gas

In this paper, photoacoustic spectroscopy method is used for hydrogen gas detection. In order to improve the performance of the sensor, we have used a miniaturized dumbbell-shaped cell containing two buffer volumes and a resonator. The coupled photoacoustic equations have been solved in gaseous environment using finite-element-method and by corresponding validation. The impacts of various effective parameters such as frequency response, quality factor, acoustic pressure and heat have been analyzed. Frequency analysis in the hydrogen gas medium leads to the first natural frequency of the sensor at 88.563 kHz which has 65 kHz difference with the second natural frequency. By studying the behavior of the resonance frequencies of the proposed system, the optimum location for the sensor positioning of the designed system has been investigated for different gases and the results show that the designed photoacoustic sensor has the fingerprint feature for detecting hydrogen gas. Moreover, the results of the cell filled by hydrogen gas have been compared to those obtained from other gases such as propane, nitrogen and carbon dioxide. The performance of the system is also evaluated for volatile organic compounds (VOCs) and nitrogen dioxide (NO₂). The analysis of the proposed miniature system shows a significant improvement in the quality factor as well as the reduction in system losses.     

倒装晶片(Flip Chip)装配工艺及其对表面贴装设备的要求

元件的小型化高密度封装形式越来越多,如多模块封装(MCM),系统封装(SiP),倒装晶片(FC)等应用得越来越多。这些技术的出现更加模糊了一级封装与二级装配之间的界线,勿庸置否,随着小型化高密度封装的出现,对高速与高精度装配的要求变得更加关键。相关的组装设备和工艺也更具先进性与高灵活性。由于倒装晶片比BGA或CSP具有更小的外形尺寸,更小的球径和球间距,它对植球工艺,基板技术,材料的兼容性,制造工艺以及检查设备和方法提出了前所未有的挑战。     

High-concentration photovoltaic designs based on miniature parabolic dishes

The recent development of photovoltaic cells for high flux levels, of the order of 1000 suns, opens new challenges for the design of solar cell concentrators. A new approach for concentrating photovoltaic systems that can easily attain the maximum flux levels commensurate with solar cell technology is proposed. The collection unit is a miniature paraboloidal dish (e.g., with a diameter of the order of 10 cm) that concentrates sunlight into a short glass rod. The flux distribution of the transported light is homogenized in a miniature glass kaleidoscope that is optically coupled to a small, high-efficiency solar cell. The cell resides behind the dish and can be cooled adequately with a passive heat sink. These nominally independent collection units can be assembled into modules and arrays that produce almost any prescribed power level. All system elements are predicated on existing technologies.     

集成式微型智能传感器的研究与思考

阐述了集成式微型智能传感器的设计原理、制造技术和发展方向,分析了集成式微型智能传感器的研究热点,提出了我国集成式微型智能传感器技术的发展思路。     

Review on microfabricated micro-solid oxide fuel cell membranes

Micro-solid oxide fuel cells (μ-SOFC) are promising power sources for portable electronic devices. This review presents the current status of development of microfabricated micro-solid oxide fuel cell membranes for power delivery. The μ-SOFC membranes are developed using micro-electro-mechanical system (MEMS) fabrication and machining techniques. The different designs of free-standing μ-SOFC membranes and μ-SOFCs deposited on porous substrates are presented. The materials used in the μ-SOFC anode, electrolyte and cathode are discussed and compared along with their microstructures. The electrical performance data of the different μ-SOFC designs are compared and discussed. High μ-SOFC performances of 677 mW cm⁻² were demonstrated at temperatures as low as 400 °C.     

A miniaturized multiband reconfigurable fractal slot antenna for GPS/GNSS/Bluetooth/WiMAX/X-band applications

A novel miniaturized multiband reconfigurable fractal slot antenna for switchable GPS/GNSS/Bluetooth/WiMax/X-band is reported. By utilizing a Koch fractal in the radiating part miniaturization of about 78.8% and 86% are achieved in volume and active patch area respectively. Multiband operations at 1.47–1.65 GHz (BW = 11.5%) GPS, 2.2–2.43 GHz (BW = 9.9%) Bluetooth, 3.4–3.89 GHz (BW = 13.4%) middle WiMAX, 5.61–5.84 GHz (BW = 4%) upper WiMAX and 9.8–10.73 GHz (BW = 9.05%) X-band, are achieved by slotted ground approach in conjunction with Complementary Split Ring Resonator (CSRR). Frequency reconfiguration characteristics in the antenna is accomplished by placing a PIN diode in the ground plane; thus making the antenna to exhibit switchable radiations at 1.91–2.34 GHz (BW = 20.73%) Bluetooth, 3.72–3.89 GHz (BW = 4.46%) middle WiMAX, 4.92–5.33 GHz (BW = 8.0%) upper WiMAX and 10.16–10.70 GHz (BW = 5.1%) X-band, under “ON” condition. During “OFF” condition, antenna exhibits switchable performances at 1.59–1.84 GHz (BW = 14.57%) GPS/GNSS, 3.77–4.12 GHz (BW = 8.87%) middle WiMAX, 5.1–5.35 GHz (BW = 4.78%) upper WiMAX and 10.27–10.62 GHz (BW = 3.35%) X-band. The antenna has a compact area of 35 × 30 mm², and exhibits acceptable gain, stable radiation patterns and good impedance matching at the targeted frequencies.