Study on reliability technology of contactor relay

In this paper, the reliability of contactor relay is studied. There are three main parts about reliability test and analysis. First, in order to analyze reliability level of contact relay, the failure ratio ranks are established as index base on the product level. Second, the reliability test method is put forward. The sample plan of reliability compliance test is gained from reliability sample theory. The failure criterion is ensured according to the failure modes of contactor relay. Third, after reliability test experiment, the analysis of failure physics is made and the failure reason is found.     

火焰原子吸收光谱法最佳测试条件的选择

本文从七个方面分析论述了火焰原子吸收光谱法的最佳测试条件，并强调了应综合考虑，优化组合最佳测试条件，并用Zn、Pb、Cd标准水样的实测结果与标准值对比后的结果对理论分析进行验证。     

药用植物学野外实践教学与大学生创新能力培养

通过野外教学实践改革,探讨野外实践教学与学生创新能力培养的关系。本文从改变野外实习教学组织形式,转变教学思维,注重实习各环节,改革实习考核方式等方面对野外实践教学与大学生创新能力培养进行了探讨。结果表明,通过野外实践教学,学生的创新能力得到培养。     

传统比奈式智商测验和智力测验的新发展

传统比奈式智商测验虽然存在着一些缺点和局限，不能视为十分理想的智力测量工具，但其价值不容忽视。６０年代以来．智力理论有了新的发展，最有代表性的是斯腾伯格提出的智力的三重理论和戴斯等人提出的＂ＰＡＳＳ模型＂智力理论。它们的特点是：注重智力中的核心和元成分，重视探索相应的智力培训程序。     

Algorithmically generated subject categories based on citation relations: An empirical micro study using papers on overall water splitting

One important reason for the use of field categorization in bibliometrics is the necessity to make citation impact of papers published in different scientific fields comparable with each other. Raw citations are normalized by using field-categorization schemes to achieve comparable citation scores. There are different approaches to field categorization available. They can be broadly classified as intellectual and algorithmic approaches. A paper-based algorithmically constructed classification system (ACCS) was proposed which is based on citation relations. Using a few ACCS field-specific clusters, we investigate the discriminatory power of the ACCS. The micro study focusses on the topic ‘overall water splitting’ and related topics. The first part of the study investigates intellectually whether the ACCS is able to identify papers on overall water splitting reliably and validly. Next, we compare the ACCS with (1) a paper-based intellectual (INSPEC) classification and (2) a journal-based intellectual classification (Web of Science, WoS, subject categories). In the last part of our case study, we compare the average number of citations in selected ACCS clusters (on overall water splitting and related topics) with the average citation count of publications in WoS subject categories related to these clusters. The results of this micro study question the discriminatory power of the ACCS. We recommend larger follow-up studies on broad datasets.     

利用Ping命令进行网络测试的策略

通过Ping命令中的不同参数,对运行网络连通性进行测试和诊断,判定网络运行情况,找出病因,使网络稳定运行.     

高考科目设置改革应以学生为本——“文理大综合”质疑

建立在会考基础之上的高考科目设置改革,要把全面发展与因材施考的关系、考综合与考特长的关系处理好。“3+文综/理综”和“3+文理大综合+1”均有不足,唯“3+文综/理综+1”为最佳模式;应考“小综合”而不考“文理大综合”,应开考全部9门课供学生选择“1”,并赋以较大权重。高考决策者应“以学生为本”,多为学生着想,多站在学生角度思考问题。     

大学英语四、六级听力应试技巧

本文介绍了大学英语四、六级听力应试的六种技巧。作者强调:应试者除了在平时进行系统的、有针对性的正规听力训练之外,他们在临场测试时,应该巧妙运用这些技巧,提高听力部分的测试成绩。     

浅述标准参照测验的编制

本文通过标准参照测验的研究,以编制标准参照测验的理论为依据,以项目反应理论指导,结合操作系统的考试科目给出了标准参照测验的编制过程。     

美俄次临界实验综述

随着全面禁止核试验条约(CTBT)的签署，核武器的研制、认证、维护工作方法，开始从依靠全尺寸的地下核试验转向以科学为基础的武器维护与管理．在此情况下，次临界实验等应运而生．美、俄在此新战场开始了新一轮竞赛，至今在其核武器试验场至少分别进行了19次和17次次临界实验．本文详细介绍了美、俄次临界实验情况并进行了分析．