电表改装与校准

电表在测量中有广泛的应用,因此如何了解电表和使用电表就显得十分重要。电流计是用来测量微小电流的,允许通过的电流很小,本文用它来扩大量程。     

三元能量对人体抗痛能力作用的比较研究

为了探索三元的奥秘,采用弹簧压力测痛器,测试了受试者的痛阈和耐痛阈,探讨了运用三元能量能力不同者抗痛能力的差异,推测：由于学习元极学,运化三元能量,人体产生三元抗痛物质,可能是一种内源性类吗咪样物质,其具有很强的抗痛能力,并能改善人的情绪。     

三极管工作原理的歧义与破解

三极管放大原理在很多教材中的微观解读,存在着疑问或歧义。文章提出相关教材的质疑点,以PN结特性为切入点,给出一个新的、全面的原理阐述,使学习者更容易分析理解。     

Dependence of electrical and optical properties of IGZO films on oxygen flow

Amorphous InGaZnO (a-IGZO) films were deposited on the corning eagle XG (EXG) glass substrates using magnetron sputtering method. The structure, surface morphology, electrical and optical properties of these films were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), semiconductor parameter analyzer and spectrophotometry, respectively. The influence of oxygen flow on the electrical properties of IGZO thin films was studied, showing that increasing oxygen flow changes the resistivity with six orders of magnitude. The contact resistance of ITO/IGZO is 7.35×10⁻² Ω·cm², which suggests that a good ohmic contact exists between In₂O₃: Sn (ITO) and IGZO film.     

晶体硅太阳电池接触电阻测量

金属电极与硅的接触电阻是太阳电池中串联电阻的一部分,是影响太阳电池填充因子和短路电流进而影响光电转换效率的重要因素之一,通过了解接触电阻的大小,可以判断太阳电池电极的优劣。接触电阻的测量,较为困难,难以精确,笔者给出了一种基于PN Vinod三点测试方法的改进方法及测试实例。     

关于权力之暴力的叙事——读莫言的《檀香刑》

《檀香刑》以文学的方式探讨了权力如何通过暴力得以施行,从而实现对中国文化的深层反思。权力的暴力形式直接而集中的体现是刽子手赵甲,权力的反抗形式的集中体现则是农民孙丙为首的义和团,莫言通过这两种力量的较量,探寻拯救民族孱弱的力量。     

放顶煤工作面煤岩组合力学模型及其控制

根据放顶煤工作面的矿山压力及其显现规律、顶煤冒放结构、顶板移动结构等影响因素,结合我国厚煤层赋存状况,给出放顶煤工作面拱—拱、拱—砌体梁、拱—传递岩梁、台阶式悬臂—砌体梁以及台阶式悬臂—悬梁组合力学模型及其控制计算公式;在实践中根据工作面具体条件分析使用以上五种力学模型,则可求得较合理的支架工作阻力,从而有效地实现顶板控制。     

Effects of coffee and caffeine anhydrous on strength and sprint performance

Caffeine and coffee are widely used among active individuals to enhance performance. The purpose of the current study was to compare the effects of acute coffee (COF) and caffeine anhydrous (CAF) intake on strength and sprint performance. Fifty-four resistance-trained males completed strength testing, consisting of one-rep max (1RM) and repetitions to fatigue (RTF) at 80% of 1RM for leg press (LP) and bench press (BP). Participants then completed five, 10-second cycle ergometer sprints separated by one minute of rest. Peak power (PP) and total work (TW) were recorded for each sprint. At least 48 hours later, participants returned and ingested a beverage containing CAF (300?mg flat dose; yielding 3–5?mg/kg bodyweight), COF (8.9?g; 303?mg caffeine), or placebo (PLA; 3.8?g non-caloric flavouring) 30 minutes before testing. LP 1RM was improved more by COF than CAF (p?=?.04), but not PLA (p?=?.99). Significant interactions were not observed for BP 1RM, BP RTF, or LP RTF (p?>?.05). There were no sprint?×?treatment interactions for PP or TW (p?>?.05). 95% confidence intervals revealed a significant improvement in sprint 1 TW for CAF, but not COF or PLA. For PLA, significant reductions were observed in sprint 4 PP, sprint 2 TW, sprint 4 TW, and average TW; significant reductions were not observed with CAF or COF. Neither COF nor CAF improved strength outcomes more than PLA, while both groups attenuated sprint power reductions to a similar degree. Coffee and caffeine anhydrous may be considered suitable pre-exercise caffeine sources for high-intensity exercise.     

表面处理工艺在修复脱粉机分配盘的应用

引进德国进口二手设备KSΦ5．7M干式脱粉机,经修复后用于潘三矿原煤脱粉;介绍了修复脱粉机分配盘组件的表面处理工艺过程和如何做好氧化处理前表面的准备、氧化处理、涂油等工序流程;使用效果表明,分配盘的耐比性和耐磨性较好,为修复进口脱粉机和推广脱粉工艺作了有益的尝试。     

建筑抗震概念设计

本文从建筑的平立面布置、抗震结构体系、结构构件和非结构构件设计等方面阐述了建筑抗震概念设计的一般原则和规律