Assessing Structural Equation Models by Equivalence Testing With Adjusted Fit Indexes

Conventional null hypothesis testing (NHT) is a very important tool if the ultimate goal is to find a difference or to reject a model. However, the purpose of structural equation modeling (SEM) is to identify a model and use it to account for the relationship among substantive variables. With the setup of NHT, a nonsignificant test statistic does not necessarily imply that the model is correctly specified or the size of misspecification is properly controlled. To overcome this problem, this article proposes to replace NHT by equivalence testing, the goal of which is to endorse a model under a null hypothesis rather than to reject it. Differences and similarities between equivalence testing and NHT are discussed, and new “T-size” terminology is introduced to convey the goodness of the current model under equivalence testing. Adjusted cutoff values of root mean square error of approximation (RMSEA) and comparative fit index (CFI) corresponding to those conventionally used in the literature are obtained to facilitate the understanding of T-size RMSEA and CFI. The single most notable property of equivalence testing is that it allows a researcher to confidently claim that the size of misspecification in the current model is below the T-size RMSEA or CFI, which gives SEM a desirable property to be a scientific methodology. R code for conducting equivalence testing is provided in an appendix.     

基于S7 200 SMART PLC和组态王的雾炮机控制系统设计

为了实现对多台雾炮机的集中管理、合理雾化除尘,提出了基于S7 200 SMART PLC与组态王的雾炮机控制系统设计方案:将S7 200 SMART PLC作为控制系统的现场控制装置,通过继电器输出控制雾炮机中的被控电机;利用组态王软件对控制系统进行设计,实现工作模式的选择、工作指令的下达及对设备状态的监视;通过TCP/IP方式实现PLC与上位机之间的实时通信。现场运行结果表明,该控制系统运行良好,操作灵活简单,提升了雾炮机的工作效率。     

Development and Application of the NT Device Driver in CNC System

The key technology of open architecture CNC systems0kernel device driver,including the interrupt mechanism.I/O subsystem,the structure of device driver and the communication between the driver and the application program,is discussed in the paper and a specific application is given at the end.     

基于软系统方法论的CAI软件开发探讨

文章在介绍切克兰德的软系统方法论(SSM)的基础上,结合CAI软件开发提出了基于软系统方法论的CAI软件开发思路和过程。     

尾式苯丙氨酸卟啉铁(Ⅲ)催化环氧化烯烃的研究

测定了尾式苯丙氨酸四苯基卟啉铁(Ⅲ)(Fe[Phe一Tpp]Cl)与锌粉、乙酸和咪唑组成的氧化模拟体系催化环氧化烯烃的吸氧动力学曲线,研究了不同轴向配体对体系催化活性的影响.实验结果表明,该体系催化环氧化各类烯烃的产物收率(Zn%)由高到低的顺序为:环己烯>1—癸烯>丙烯酸甲酯>烯两基丙酮,用吡啶代替咪唑可明显提高体系的最高吸氧速度.     

EJA智能变送器校验的研究

EJA智能变送器是目前中国市场上最先进的变送器，它在使用一个周期以后应当进行检验。本文介绍了EJA智能变送器的工作原理，说明了对精度较高的智能变送器在实验室中进行校验的方法。     

关于人的两重未来——弗罗洛夫人研究观点析

弗罗洛夫把人放在全球性问题的背景下,从发生学意义上和社会学意义上加以考察。他的“人研究”任务就是遵循这条思路,在人的现实生存境况中,一方面把人作为生物学上的人,展示其生物学前景;另一方面把人作为社会人,展示其社会学前景。弗罗洛夫对人及人的未来进行了全面的描述,跳出了传统哲学人学单纯从人的生物学意义上,或者只是从社会学意义出发,对人的本质把握的圈子,从而丰富和拓展了马克思主义哲学人学理论,也为中国哲学界的人学研究提供了社会科学与自然科学密切结合的研究方法和研究内容的有益借鉴。     

Testing the Intervention Effect in Single-Case Experiments: A Monte Carlo Simulation Study

This article reports on a Monte Carlo simulation study, evaluating two approaches for testing the intervention effect in replicated randomized AB designs: two-level hierarchical linear modeling (HLM) and using the additive method to combine randomization test p values (RTcombiP). Four factors were manipulated: mean intervention effect, number of cases included in a study, number of measurement occasions for each case, and between-case variance. Under the simulated conditions, Type I error rate was under control at the nominal 5% level for both HLM and RTcombiP. Furthermore, for both procedures, a larger number of combined cases resulted in higher statistical power, with many realistic conditions reaching statistical power of 80% or higher. Smaller values for the between-case variance resulted in higher power for HLM. A larger number of data points resulted in higher power for RTcombiP.     

福克纳小说中的圣经原型对人性的探索

大多数专家、学者在研究福克纳及其作品时,都把注意力集中于福克纳小说中的种族冲突、美国南方制度以及小说的多角度叙述、时空变幻等方面。只有少数研究者注意到了福克纳小说与基督教文化的关系。文章从一个新的角度深入挖掘了福克纳的作品对人性的探索;探索现代人在失去人类古老的美德之后人性的堕落;探索社会等级制度对人性的摧残和探索种族主义对人性的践踏三个方面。     

美国干涉墨西哥1910年革命对美国参加第一次世界大战的影响

美国干涉墨西哥1910年革命,美墨关系交恶,促使德国发出了意欲结盟墨西哥的《齐默尔曼电报》。此举客观上促使美国下决心放弃中立政策,促成了美国早日参加第一次世界大战的形势的成熟。