Automation of Solubility Measurements on a Robotic Platform

Experimental investigation in the laboratory can be accelerated and supported by miniaturized automation techniques. In the design of unit operations, e.g., for crystallization and precipitation processes or for chromatographic separations where no solids should appear during the run, reliable solubility data are mandatory. The development and validation of a robotic routine for completely automated solubility measurements are introduced. The triple‐determination of automated solubility measurements of the model systems succinic acid and adipic acid/water have a relative standard deviation below 0.99 % and are comparable to literature and manual experiments. Data are generated with high precision and accuracy, and the experimental effort and the hands‐on time are reduced significantly to a few minutes necessary to prepare the platform since all subsequent pipetting and control steps are automated.     

Miniaturized Gysel power divider with nth harmonics suppression

In this paper, a miniaturized Gysel power divider with n^th harmonic suppression has been presented. The Gysel power divider retains its capability of high-power handling, while extreme size reduction makes it suitable for application in small-sized circuits with higher order harmonics rejection. A lowpass filter with high performance and appropriate characteristic has been placed instead of the conventional transmission lines a quarter wavelength. It results in the size reduction and harmonics rejection of the Gysel power divider, effectively. The presented Gysel power divider operated at center frequency of 0.764 GHz with fractional bandwidth of 36%. To substantiate the validity and efficiency of the proposed circuits, the designed power divider was fabricated and measured. It is seen that the results of the measurements and simulations are highly consistent together. The main frequency; the return loss of the port 1, the return loss of the port 2, isolation, and insertion loss are 28, 29, 32 and 1.3 dB, respectively. The overall circuit size is 22.1 mm × 65.7 mm.     

Ammonia-water desorption heat and mass transfer in microchannel devices

This paper presents the results of an experimentally validated model for the prediction of local heat and mass transfer rates in a microchannel ammonia-water desorber. The desorber is an extremely compact 178 mm × 178 mm × 0.508 m tall component capable of transferring the required heat load (∼17.5 kW) for a residential heat pump system. The model predicts temperature, concentration and mass flow rate profiles through the desorber, as well as the effective wetted area of the heat transfer surface. Previous experimental and analytical research by the authors demonstrated the performance of this same microchannel geometry as an absorber. Together, these studies show that this compact geometry is suitable for all components in an absorption heat pump, which would enable the increased use of absorption technology in the small-capacity heat pump market.     

水冷大容量高压变频器“FRENIC4800VM5”

作为钢铁、有色金属的轧制主机,大型的鼓风机、压缩机等驱动用的高压变频器,随着设备的大规模化,不断要求变频器大容量化和操控盘的小型化。富士电机公司为满足这些要求,一直研究水冷技术和小型化技术,积累着分析与实验中的研究经验。力图通过水冷技术提高冷却性能与可靠性,已使水冷大容量高压变频器"FRENIC4800VM5"产品化。实现了输出功率比本公司原来增大2.4倍的大容量化和操作盘外形尺寸比原来小1/3的紧凑结构。     

小型UPS电源的嵌入式系统设计与实现

针对直流不间断电源纹波小、输出稳定的特点,提出了一种小型智能化UPS系统的嵌入式设计方案。系统结合高效AC-DC模块、LTC1512稳压充电模块、LTC3780高性能降压-升压型放电模块和LTC4256热插拔保护模块,以获得纯净、稳定的直流输出。嵌入式系统采用C8051F320为主控芯片,通过ADC监测、智能判断、实时...     

静北潜山油藏小断层模拟

小断层指不能据地震资料辨识的断层，其垂直断距为３０～５０ｍ。小断层的存在对地下流体流动影响很大，在油田勘探和开发中，预测小断层是一大难题。小断层预测包括小断层数预测和其空间位置预测，预测基础是断层的分形性（表现在型式和总体分布方面）。断层的规模可相差很大，但在同一构造应力场中形成的断层群的分布型式很相似；在以断层长度或垂直断距为分析对象时，个体频率在一定范围内呈现出幂律分布特征，且断层长度与垂直断距间亦有幂律关系。据此，认为断层总体幂律在由岩心尺度到地震精度所能辨识的断层尺度范围基本不变，因而可以由已知断层总体幂律来预测小断层数，再用已知断层的产状分布和密度分布来预测小断层的产状和空间位置。以辽河坳陷静北潜山油藏的小断层模拟预测为例，说明本模拟方法。图４参１２（王孝陵摘）     

基于吸附制冷技术的小型冷热电联供系统的发展概况

本文简要地综述与分析了小型冷热电联供系统和余热驱动吸附制冷技术的应用现状。冷热电联供系统属于分布式能源系统,是充分利用低品位热能的有效手段,系统能源综合利用率高,小型化和微型化是其发展方向;吸附制冷技术作为一种低品位热能驱动的绿色环保技术,应用于小型冷热电联供系统,目前已经成为国际普遍关注的一个学术方向。     

基于LTCC 的北斗接收机开关电路小型化设计

基于LTCC（Low Temperature Co-fired Ceramic）技术将多工器、扼流器、微波传输线等内置于LTCC 基板内, 开关电路和隔直电容等表贴器件通过台阶腔形式内置或放置顶层,从而实现北斗单兵接收机开关电路小型化设计。该 电路具有插损低、抑制高、体积小（实际尺寸为10mm×9mm×4mm）等特点。     

电子设备机箱设计

机箱设计作为电子设备结构设计的主要内容,已成为实现设备技术指标的重要环节。本文阐述了电子设备机箱设计的准则,提出了机箱设计的模块化、小型化和造型设计理念,详细讨论了几种常用机箱结构设计应注意解决的问题。     

In-situ characterization of interface delamination by a new miniature mixed mode bending setup

A new miniature mixed mode bending (MMMB) setup for in-situ characterization of interface delamination in miniature multi-layer structures was designed and realized. This setup consists of a novel test configuration to accomplish the full range of mode mixities and was specially designed with sufficiently small dimensions to fit in the chamber of a scanning electron microscope (SEM) or under an optical microscope for detailed real-time fracture analysis during delamination. Special care was taken to minimize the effects of friction, the influence of gravity, and non-linearities due to the geometry of the setup. The performance of the setup was assessed using specially-designed test samples supported by finite element analyses. Delamination experiments conducted on homogeneous bilayer samples in mode I and mixed mode loading were visualized with a scanning electron microscope and showed the formation of small micro cracks ahead of the crack tip followed by crack bridging and a full crack, thereby demonstrating the advantages of in-situ testing to reveal the microscopic delamination mechanism.