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871.
周守喜 《渝西学院学报(自然科学版)》2005,4(3):74-76
理科基础实验是培养学生的动手能力、实事求是的科学态度及创新精神的重要途径之一.任何理科的实验教学形式都需要3个基本的教学步骤准备实验、指导实验、评价实验.笔者围绕着这3个方面论述如何抓好实验的各个环节,以提高实验教学效果. 相似文献
872.
基于ATmega16的pH参数在线测控仪设计 总被引:3,自引:0,他引:3
为了在线连续准确测量水体溶液中的氢离子浓度(pH值),为各种生产过程提供准确、可靠的工艺参数,设计了新型pH参数在线测控仪.分析了化学分析法、试纸分析法和电位分析法测量pH值的原理和各种测量方法的优缺点,以及电位分析法测量pH值时环境参数对测量结果的影响和软硬件补偿方法.以电位分析法为基础,应用新材料技术的成果,自制了新型一体化酸度传感器.并以新型高速单片机———ATmega16为核心,设计了具有数据采集与处理、现场控制与远程通信等功能的测控仪表.经实际使用表明,用电位分析法测量各种水体溶液的pH值,可以做到在线实时测量,测量结果准确可靠.以ATmega16为核心的测控仪表,性能先进、抗干扰能力强,可以满足各种工业现场应用的要求.该pH参数在线测控仪已应用到多个工业企业的日常生产过程中,应用前景广泛. 相似文献
873.
MA Yutao LIN Yuan XIAO Xurui LI Xueping ZHOU Xiaowen 《科学通报(英文版)》2005,50(18):1985-1990
TiO2 nanotubes with diameters of 10 nm and lengths up to 600 nm were fabricated by directly using commercial TiO2 powders P25 as the precursors via sonication-hydrothermal combination approach. TiO2 nanotubes were characterized by means of X-ray powder diffractometer (XRD), scanning electron microscope (SEM), selected area electron diffraction pattern (SAED) and transmission elec- tron microscope (TEM). The light scattering property of film electrodes modified with TiO2 nanotubes was studied and revealed that TiO2 nanotubes can be used as the light scattering centers to increase the light absorption in dye-sensitized solar cells. The TiO2 nanotubes film electrodes mixed with 10% small nanoparticles TiO2 had both strong light scattering property and fine mechanical characteristics, and this kind of electrodes can be used as electrodes in improving the conversion efficiencies of dye-sensitized solar cells. 相似文献
874.
A large number of pneumatic rock drills are being extensively used in a majority of mines in China nowadays, with a high noise level up to 125 dB(A) and large vibration and oil-fog on working-site, which can seriously jeopardize manipulator' s body and mind. Aiming at improving drilling environment and labor safety condition, the production mechanism of noise of all sorts of rock drills including pneumatic hydraulic and water-powered rock drills and measures of reducing noise level of pneumatic rock drills in special were discussed and led to the conclusion of that the pneumatic rock drills should be eliminated step by step, the hydraulic rock drill should be developed at full speed and especially the water-powered rock drill should be studied and applied according to the situation of China. In addition, the reasons of why hydraulic rock drills have not yet been used extensively and spread wide areas in China were discussed. The main technical parameters of newly developed leg-supporting water-powered rock drill and the comparation of experimental data between pneumatic rock drill and hydraulic rock drill were listed. The experimental results show that water-powered rock drill possesses the same superior properties as hydraulic rock drill and its noise is less than 20 dB(A) than pneumatic rock drill and there is no oil-fog on the working-site and vibration is reduced largely~ but its drilling speed is raised largely , its structure is simpler, and maintenance is convenient. Therefore, popularizing applying of water-powered rock drill will be an effective way of improving mine working environment according to the current situation of China. 相似文献
875.
由于在设计、生产、使用、维护等产品生命周期各阶段的不确定因素的影响,使机械零件的质量产生波动,可靠度降低。文中试图在机械设计初期,结合概率统计分析理论和可靠性设计理论,揭示出机械零件的可靠度与基本设计变量之间的本质联系,推导出可靠度对参数的灵敏性计算公式,用直齿圆柱齿轮的计算实例进行分析,深刻探讨齿轮设计参数的变化对齿轮可靠度的影响方向和灵敏程度。其结论对齿轮的设计人员、制造和使用人员在理论和实践中均具有重要的参考价值。 相似文献
876.
个人所得税收入分配效应的模型分析 总被引:3,自引:0,他引:3
通过分析征税行为对征税前后的基尼系数的影响,讨论了个人所得税的收入分配效应.结论是只有当税赋基尼系数大于税前基尼系数时,征收个人所得税才能对收入分配起到调节作用. 相似文献
877.
878.
Experimental study to confirm the existence of hydrocarbon under high pressure and temperature of deep lithosphere 总被引:1,自引:0,他引:1
WANG Chuanyuan DU Jianguo WANG Wanchun XIE Hongsen CHEN Guojun DUAN Yi ZHOU Xiaocheng 《科学通报(英文版)》2006,51(13):1633-1638
Previous studies indicated that the existence of over- pressure in sedimentary basins not only affects the as- sessment of oil and gas resources, but also closely re- lates to the accumulation and preservation of petroleumin deep reservoirs[1,2]. It is well known that there are more than 180 overpressure basins in the world. Be- cause fluid pressure is transient in sedimentary basin over geologic time, the effect of increasing pressure on organic matter metamorphism is difficult to determine, … 相似文献
879.
Radio frequency interference (RFI) is a major problem in high-frequency (HF) radars. Conventional filtering-involved RFI suppression methods may introduce distortions to the target signals of interest and often demand extra hardware costs. In this paper, a novel method for RFI suppression by using linearly or randomly phase-modulated (PM) chirps is proposed, which enables independent analyses of the target signal and the RFI. Furthermore, the directions of arrival (DOA) of the interference are used as constraints to ensure a better DOA estimation of the target. The effectiveness of the method is demonstrated by numerical simulation results. The method can greatly improve the anti-interference capabilities of HF radars and is extremely applicable in the portable and low-cost radar systems. 相似文献
880.
This paper proposes a checking method based on mutual instances and discusses three key problems in the method: how to deal with mistakes in the mutual instances and how to deal with too many or too few mutual instances. It provides the checking based on the weighted mutual instances considering fault tolerance, gives a way to partition the large-scale mutual instances, and proposes a process greatly reducing the manual annotation work to get more mutual instances. Intension annotation that improves the checking method is also discussed. The method is practical and effective to check subsumption relations between concept queries in different ontologies based on mutual instances. 相似文献