利用淘汰的大容量电池组改装UPS电源

随着广播电视事业的发展,对安全播出的要求不断提高,这样不间断电源UPS就越来越需要。但由于各种原因,某发射台一直没有配备UPS电源。2009年由于全省微波数字化改造完成,原有的微波设备被淘汰,其中包含有大容量的蓄电池组,利用其和原有的直流屏组合可稳定的输出24V直流电,据此将它们改装为一个输出220V工频交流电的UPS电源,供信号机房内重要的信号源设备使用,提高了安全播出的可靠性。     

大学法语四级与CEFR的等级标准关系研究

为适应新形势下的中外校际交流合作办学的要求,法语教学的内容和形式既要迎合赴法学生对欧洲语言共同参考框架的标准,又要满足国内学生对大学法语四级考试的需求。从设定标准的角度分析二者的等级对应关系,从B2标准等级序列中,在常规法语教学中协调他们之间的考级差异。     

Assessment of renal acidification capacity of stone formers by acid challenge test

Acid challenge test was carried out on 87 subjects (37 normal and 50 radiologically proven stone formers) to assess their renal acidification capacity. NS were given three doses viz. 75, 100 and 150 mg NH₄Cl/Kg body weight while the SF were tested with only 150 mg dose which was found to be an adequate dose. Ammonium chloride was given in gelatin capsules with breakfast and hourly urine samples were collected for next 7 hours. pH, creatinine, calcium, inorganic phosphorus, citrate, titrable acid and ammonium were analysed in all the samples. The incidence of renal tubular acidosis (RTA) in NS, tested with 75 mg and 100 mg/kg doses of ammonium chloride, was 50% and 10% respectively while it was nil and 24% respectively in NS and SF tested with 150mg/kg dose. Complete RTA was detected in one SF. No significant difference was observed in urinary profile of NS and SF except that the hourly titrable acid excretion was lower in later. A comparison between with and without RTA SF revealed that titrable acid and phosphate excretion decreased in RTA defect. Overall data indicate that (a) RTA was an etiologic factor in one fourth of the SF; (b) an oral acid challenge test is a good adjunct to detect this condition and (c) acid challenge increases calcium, phosphate and titrable acid excretion and decreases citrate.     

RBP网络在大型发电机微碱循环水测量中的应用

大型发电机微碱循环水的测试具有被测水量太,测试间隔时间长的特点,鉴于此,提出一个利用神经网络建立一个预报模型的方法,并将该模型用于水质的测量和预测,通过现场测试,本系统实时性好,可靠性和精度高,大大提高了水质测量的科学性和水质调节的指导性,是一个利用BP网络进行软测量的典型应用.     

Precision spectroscopy of atomic helium

Helium is a prototype three-body system and has long been a model system for developing quantum mechanics theory and computational methods. The fine-structure splitting in the 2³P state of helium is considered to be the most suitable for determining the fine-structure constant α in atoms. After more than 50 years of efforts by many theorists and experimentalists, we are now working toward a determination of α with an accuracy of a few parts per billion, which can be compared to the results obtained by entirely different methods to verify the self-consistency of quantum electrodynamics. Moreover, the precision spectroscopy of helium allows determination of the nuclear charge radius, and it is expected to help resolve the ‘proton radius puzzle’. In this review, we introduce the latest developments in the precision spectroscopy of the helium atom, especially the discrepancies among theoretical and experimental results, and give an outlook on future progress.     

试论产品类项目的科技查新

本文总结了产品查新的特点、作用及存在的主要问题，讨论了提高产品查新质量的办法。     

自主创新与企业核心竞争力关系的实证研究

在分析企业核心竞争力和自主创新已有的研究成果基础上,从理论的角度出发,揭示了自主创新与企业核心竞争力的相关关系;并用计量经济学的方法对其定量研究,得出了结论:技术创新是提升我国大中型工业企业核心竞争力的关键,但是离不开自主创新的贡献作用;最后,根据上述给出了基于自主创新的提升大中型工业企业核心竞争力的一些政策建议。     

某大型火电站解决汽轮机喷油试验不成功问题的实践

文章根据人机材料方法环境,分析在中国北方的大型火力发电站失败的几个蒸汽涡轮机燃油喷射试验,同时阐述如何解决。