共查询到19条相似文献,搜索用时 78 毫秒
1.
2.
单板机在粘度测量实验中的应用韩玖荣,詹鼎(扬州大学225001)一、引言在大学物理实验中,特别是农业院校一般都有粘度测量这个实验.液体粘度的测量有多种方法,旋转法、毛细管法、落球法,最近还有人制成功了超声粘度计[1]。在学生实验中,一般采用毛细管法和... 相似文献
3.
4.
<正> 随着大规模集成电路突飞猛进的发展,计算机技术已广泛渗透到社会各个方面,它对整个社会的经济、乃至人们的生活,已经发生了巨大的影响。自从1946年第一台电子计算机设计和运行以后,计算机主要朝着大型和快速的方向发展。七十年代微处理机的兴起,引起了计算机行业的变革,一方面是小型机微型化,另一方面,大中型计算机公司也不得不重视微型机系统的开发。这是由于微型机和单板机价格低廉,又有一定的功能,所以在实时数据处理、过程控制、仪器仪表配套等方面应用很广,它的出现促进了自动化技术的发展,加速了人工智能的 相似文献
5.
6.
用X射线小角散射SAXS)研究了光色玻璃中卤化银微晶尺寸同热处理温度的关系.发现在490℃以下热处理的玻璃,同原始玻璃一样,没有明显的散射.但由银含量仅为0.3(重量%)的玻璃能观察到散射干涉现象正说明银离子被富集在分散的Na_2O-B_2O_3液滴之中.从高温处理后冷却至440℃再快冷到室温的玻璃,其卤化银颗粒的尺寸比直接淬冷到室温的玻璃要大,后者约为110(?).玻璃中加入ZrO_2后,使卤化银颗粒尺寸达到近乎20O(?).基体玻璃中的-液分相,由于分散相与连续相之间的电子密度差太小,难以对其SAXS强度作定量处理. 相似文献
7.
在狭缝式高速摄影机联动控制系统中,电机调速采用自做单板机进行控制,得到了比较理想的效果。 本文主要叙述了利用单板机对狭缝相机中直流电机自动调速的原理。全文分三个部份,第一部份叙述了数字式控制电机速度的原理,第二部份叙述了单板机的结构和控制原理,第三部份叙述了遥控接收装置的结构和原理。 相似文献
8.
利用电场热处理工艺,成功制备出含纳米尺寸金颗粒掺杂的硼硅酸盐玻璃,采用x射线衍射、扫描电子显微镜和吸收光谱分析了在不同工艺条件下制备得到的玻璃样品的相成分、微观形貌和光学性能.然后在理论上分析了外电场对掺杂玻璃热处理过程的影响,提出了适合掺金玻璃的电场热处理热力学模型.模型中的关键因素是电场能量变化量,对此采用两种方法计算,一种是在一定简化后的理论计算;另一种是利用计算机有限元方法计算.两种方法的结果比较相近,并且都能解释前面的实验现象.
关键词:
掺金玻璃
形核
电场 相似文献
9.
10.
11.
12.
Lezova I. E. Salamatov E. I. Taranov A. V. Khazanov E. N. Charnaya E. V. Shevchenko E. V. 《Journal of Experimental and Theoretical Physics》2019,129(5):849-854
Journal of Experimental and Theoretical Physics - The influence of the Schottky low-energy excitations related to the presence of rare-earth metals on the thermodynamic and kinetic characteristics... 相似文献
13.
Optics and Spectroscopy - A new method of formation of relief-phase holographic structure on dichromated gelatin (DCG) layers has been proposed. The method is based on two types of alternative... 相似文献
14.
采用热处理方法提高MEH-PPV单层聚合物有机发光二极管发光性能的研究 总被引:1,自引:1,他引:1
对以MEH-PPV为发光层的单层聚合物有机发光二极管(OLED)器件在最佳条件下进行真空热处理,并用金相显微镜观察施加电压后器件的阴极表面形貌。发现处理后的器件阴极表面的气泡及黑斑明显减少。器件的发光性能显著提高。与未经处理的器件相比,最大相对发光强度提高了一个数量级、启亮电压降低了2.0V,半寿命提高了12.7倍。初步分析表明热处理方法提高器件发光性能的主要原因在于有效地减少了器件在工作过程中由于焦耳热产生的某些气体,从而减少阴极表面气泡及黑斑的出现,另一方面,热处理方法也增强了有机发光层与阴极接触界面的结合力,提高电子注入水平。 相似文献
15.
The processes of initiated crystallization of natural granitoid-based glasses containing FeO+Fe2O3 (7–8 wt.%) have been investigated by means of IR spectroscopy. It has been established that iron oxides play an active role
in crystallization and pass from a disordered vitreous component into an ordered crystal one. A conclusion on the exact likeness
of the processes of glass crystallization in single- and double-stage regimes of thermal treatment has been drawn.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 5, pp. 640–643, September–October, 2005. 相似文献
16.
Efficient and economical utilization of industrial waste heat would result in reduced energy use and thereby contribute to reduction of greenhouse gas emissions to the atmosphere. Two-phase thermosyphon technology has demonstrated the potential capability for waste heat recovery, but it has not been yet utilized in large-scale industrial applications. As a part of an industrial project, various types of thermosyphon heat pipes have been designed and tested for extraction of waste heat and process control in aluminum industry. This article presents the heat and mass transfer model, developed to provide a fast and accurate simulation tool for industrial application of thermosyphon heat pipe technology for waste heat utilization. The mathematical model considers the energy, momentum, and mass transfer equations, in their one-dimensional form, to predict output parameters of the thermosyphon and enable parametric and sensitivity analysis. The mathematical model structure is set up in a way that the least numerical cost and time is spent while the model accuracy is kept at acceptable level for the defined application. To provide experimental data for validation of the simulation model, the proposed thermosyphon was tested experimentally using a test set-up instrumented for this purpose. The simulation results are found to be in good agreement with the experimental data. The developed model and code are viable to be used as a simple and fast tool for modeling, design, and optimization of the thermosyphon as an element in a heat recovery module. 相似文献
17.
热桩(热管)是一种气液两相对流循环的导热系统.它是一根密封的管,里面填充一定量的工质(如氮、丙烷、CO2等),上端为散热片组成的冷凝器,下端为装有工质的蒸发器,中间为绝热段(图1).当冷凝器的温度低于蒸发器的温度时,蒸发器内的 相似文献
18.
Simple, fast and accurate procedure is developed for measuring a Transformation Function (TF) of a Photochromic Adaptive Filter (PAF). Photochromic filters, whose spectral transmittance depends on previous and immediate radiant exposure and other environmental conditions, require special methods of spectro-photometry to determine their properties. This article describes methodology of characterizing the luminous transmittance as a function of light intensity using easy to implement method. Transformation functions of sample filters for different sources of radiation and varied light intensity are evaluated. The measuring system can also be used for fast determination of spatially and spectrally uniform light sources with UV spectral component. 相似文献