内置旁路型软起动器的替代性

本文根据软起动器的发展趋势，就目前市场上应用的三种类型的软起动器进行分析，说明各自的优缺点，同时给出结论，内置旁路型淘汰其它类型的软起动器的必要性。     

Batch cultures of Penicillium camembertii on glucose and amino acids—model for growth and ammonium production

BACKGROUND: Three groups of amino acids were previously characterized based on their ability to be assimilated as carbon source by Penicillium camembertii. To describe the diauxic growth recorded on glucose and amino acids from the second group, such as arginine, an unstructured model was previously developed, based on the sequential consumption of both carbon substrates, glucose, followed after its exhaustion, by arginine. The model was modified to describe also the behaviour recorded during growth on other amino acids. RESULTS: The growth model involved the carbon substrate consumption (Verlhust model) and the biomass on carbon substrate yield. Glucose was therefore considered during P. camembertii growth on nitrogen source amino acids (lysine—first group); and amino acid consumption was considered during growth on carbon source amino acids (glutamate—third group), with glucose being dissimilated only for energy supply. The excess nitrogen from amino acids was released as ammonium; the linking of this production to growth was found to increase with the ability of the amino acid to be assimilated as carbon source by P. camembertii. CONCLUSION: The various metabolic behaviours recorded during P. camembertii growth on amino acids, in the presence of a primary carbon source such as glucose, were proved to be satisfactorily described by the model, showing the robustness of the model. Copyright © 2007 Society of Chemical Industry     

软启动装置

低压鼠笼型交流感应电动机在冶金系统应用极其广泛，对其传统的启制动方式的不足之处加以讨论，引出新型启动和停止装置－软启动器，该装置极大地减轻对电网和设备的冲击，还可作节能运行，对低减转矩类负载尚可开发调速性能。     

Sensitivity to Cisplatin in Head and Neck Cancer Cells Is Significantly Affected by Patient-Derived Cancer-Associated Fibroblasts

Cancer-associated fibroblasts (CAFs) are one of the most abundant and critical components of the tumor stroma. CAFs can impact many important steps of cancerogenesis and may also influence treatment resistance. Some of these effects need the direct contact of CAFs and cancer cells, while some involve paracrine signals. In this study, we investigated the ability of head and neck squamous cell carcinomas (HNSCC) patient-derived CAFs to promote or inhibit the colony-forming ability of HNSCC cells. The effect of cisplatin on this promoting or inhibiting influence was also studied. The subsequent analysis focused on changes in the expression of genes associated with cancer progression. We found that cisplatin response in model HNSCC cancer cells was modified by coculture with CAFs, was CAF-specific, and different patient-derived CAFs had a different “sensitizing ratio”. Increased expression of VEGFA, PGE2S, COX2, EGFR, and NANOG in cancer cells was characteristic for the increase of resistance. On the other hand, CCL2 expression was associated with sensitizing effect. Significantly higher amounts of cisplatin were found in CAFs derived from patients who subsequently experienced a recurrence. In conclusion, our results showed that CAFs could promote and/or inhibit colony-forming capability and cisplatin resistance in HNSCC cells via paracrine effects and subsequent changes in gene expression of cancer-associated genes in cancer cells.     

航空电励磁双凸极无刷直流起动发电机系统控制关键技术综述

电励磁双凸极电机具有结构简单可靠、容错性能好、控制灵活等优势,可构成一种具有竞争力的新型航空无刷直流起动发电机系统。简述了电励磁双凸极起动发电机系统的构成及其工作原理。针对航空电源这一特殊应用领域的要求,对电励磁双凸极起动发电机高可靠性控制、高效率高功率密度控制、集成化控制等关键技术进行了归纳总结。讨论了电励磁双凸极起动发电机控制关键技术的未来发展趋势。     

基于Profinet的电机启动器在物流系统中的应用

针对物流系统现场设备的特点,介绍基于Profinet的电机启动器的设计与应用.     

浅论民族音乐在高校音乐教育中的融入与发展

分析民族音乐面临的困境与发展现状,揭示我国民族音乐的独特内涵及深远的意义,从民族音乐的收集与整理、教材的编写与推广、课程与师资队伍建设、教学模式的创新,音乐教育资源的整合、民族音乐文化活动的开展与弘扬等方面,提出推进民族音乐在高校音乐教育中的融入与发展的对策。     

软启动器在煤矿大采高工作面中的应用研究

介绍了神华乌海能源有限责任公司大采高工作面的供电方案及设备配套,研究了软启动器在刮板输送机中应用的可行性,重点分析了使用软启动器之后采区负载启动时对移动变电站的电气冲击情况。使用Matlab/Simulink软件建立采区供电系统模型,对软启动器的启动性能进行仿真分析,在轻载时使用限流启动方式,在重载时使用变频启动方式,结果表明软启动器能有效降低设备启动时的电气冲击。     

选煤厂取料机料耙液压泵站控制系统设计

针对目前选煤厂取料机料耙液压泵站电动机大多采用直接启动方式,液压油的温度检测采用模拟仪表实现,存在着对设备冲击大、油温检测精度不高、可靠性差等问题,提出了基于软启动器和PLC的新型液压泵站控制系统设计方案。该系统通过PLC采集液压泵站油温及设备运行状态,根据设定的工作模式对其进行控制,并可实时在线显示液压泵站运行状态、故障诊断报警信息,具有油温超限、滤油器堵塞、电动机过流等多种保护功能。     

支持CRM分析的数据仓库多维启动模型

CRM是一种整合了知识管理、数据挖掘及数据仓库技术的商业策略,旨在支持制定决策来保留长期有利的客户关系。分析了CRM中数据仓库的设计问题,提出一种支持CRM分析的强劲的多维启动模型。为验证此模型,用一些CRM的查询进行测试,并定义两个量:成功率和适配率来评估。实验结果表明,此启动模型具有很高的成功率和适配率,可用于客户收益分析、市场收益分析、产品收益分析、渠道收益分析等多种收益分析。