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device
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     Intelligent apparatus and device
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  device
A new molecular rectifier device and some research in its processing
      
The device with a sandwich structure shows good rectificative phenomena.
      
The highest rectification ratio 10000 was achieved in device Cu/MR-1/Ag, and about 100 in other device M/MR-X/M (M: Cu, Ag).
      
The electrospinning equipment was designed in a new way, wherein the spinneret was combined with a gas jet device.
      
In this review, we briefly summarize the current status of organic field-effect transistors including materials design, device physics, molecular electronics and the applications of carbon nanotubes in molecular electronics.
      
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The phenomellon of limiting heating is of vital importance and interest in the study of gas' flow through a tube with heat additioll fi.om both theoretical and practical points of view. In particular, it has applications to the design of thel.mal ducts of pl'opulsive devices for high speed aircraft. TI}ils poper col,sists of a prelimillary "study Of limiLing'heating for the;(jfole case of a perfect gas in steady flow through a tube of unifornl cross section. It starts from tile fulldamelltal laws governing...

The phenomellon of limiting heating is of vital importance and interest in the study of gas' flow through a tube with heat additioll fi.om both theoretical and practical points of view. In particular, it has applications to the design of thel.mal ducts of pl'opulsive devices for high speed aircraft. TI}ils poper col,sists of a prelimillary "study Of limiLing'heating for the;(jfole case of a perfect gas in steady flow through a tube of unifornl cross section. It starts from tile fulldamelltal laws governing the gas now, fi-om which analytical condiLion for limiting heatillg is then derived, and the beavior of gas at exit as resulted. from limiting heating is discussed in some details. Among the conclusions thus obtained, it is interesting to notice that, as the result of limiting hear,ing the gas is leaving tile exiL with less temperature or velocit,y within certain ranges of initial Mach Number; and that sonic s'tate is 'the limiting state that could be reached by ally flow, subsonic or supersonic, t}lrough 11eat addition.

管内稳流气体之加热不能超过一定之限度,逾限即发生所谓限塞现象.在气体热动力学之理论与实际上,极限加热为一重要而饶有兴趣之问题.在现代高速度航空推进机热管部份之设计大多应用。本文试就极限加热作初步之分析:篇首先述气体流动之基本定律,由此以诱导加热限度公式,再由此讨论气体经过极限加热後之状态,并就气体加热前之流速分次声速(subsonic),声速(sonic)与超声速(supersonic)三种情况加以比较.在本文所得结论中,有值得吾人注意者即流动气体在某一速度范围之内其温度与速度反因加热而减低.此外声速状态(sonic state)为任何流动,(flow),不论是超声速底或次声速底,经加热後所能达到之极限状态,亦由本文根据极限加热之理论加以证明.在 paul Ghambre与林家翘两先生之“On the steady Flow of a Gas Through aTube with Heat Exchange orchemical Reaction”文中会有仝样之结论,共立论系从气体瞬间状态之分析入手,不涉加热限度.本文则从气体起始与终结状态间之关系着手,而以极限加热为讨论中心.如与二氏原文参看可以相中互印证补...

管内稳流气体之加热不能超过一定之限度,逾限即发生所谓限塞现象.在气体热动力学之理论与实际上,极限加热为一重要而饶有兴趣之问题.在现代高速度航空推进机热管部份之设计大多应用。本文试就极限加热作初步之分析:篇首先述气体流动之基本定律,由此以诱导加热限度公式,再由此讨论气体经过极限加热後之状态,并就气体加热前之流速分次声速(subsonic),声速(sonic)与超声速(supersonic)三种情况加以比较.在本文所得结论中,有值得吾人注意者即流动气体在某一速度范围之内其温度与速度反因加热而减低.此外声速状态(sonic state)为任何流动,(flow),不论是超声速底或次声速底,经加热後所能达到之极限状态,亦由本文根据极限加热之理论加以证明.在 paul Ghambre与林家翘两先生之“On the steady Flow of a Gas Through aTube with Heat Exchange orchemical Reaction”文中会有仝样之结论,共立论系从气体瞬间状态之分析入手,不涉加热限度.本文则从气体起始与终结状态间之关系着手,而以极限加热为讨论中心.如与二氏原文参看可以相中互印证补充。

The design and erection of the air-conditioning system used in the spinning and weaving research laboratory in this institute has been described. The total floor space of this research laboratory is about 250 square meters; and the laboratory contains three rooms for carding and drawing, spinning and weaving respectively. Air is treated in a spraying chamber and then conducted into the three rooms. Devices are provided to regulate and control automatically the relative humidity in the rooms seperately....

The design and erection of the air-conditioning system used in the spinning and weaving research laboratory in this institute has been described. The total floor space of this research laboratory is about 250 square meters; and the laboratory contains three rooms for carding and drawing, spinning and weaving respectively. Air is treated in a spraying chamber and then conducted into the three rooms. Devices are provided to regulate and control automatically the relative humidity in the rooms seperately. Means of heat insulation of the building are described and the calculated results and the coefficients used in the calculatons are listed and tabulated. The specifications of the main equipments selected are shown at the end of this paper and the constructions of the spraying chamber and air ducts are briefly described. Polarographic determination of Aluminum in the Coagulating Bath of Viscose......S. C. Wang and T. Sun (51) 1. The present paper describes the methods and precautions of the isolation and the polarography of aluminum in the coagulation bath of viscose. 2. It has been found in our experiment that the optimum pH is 4 for the polarographic analysis of aluminum. 3. During the polarographic analysis of aluminum, the presence of ammonium ion causes the significant appearence of hydrogen wave. 4. Potassium chloride can be used successfully as the supporting electrolyte instead of lithium chloride in this experiment. 5. The removal of iron is essential in the polarography of aluminum at pH 4, otherwise the height of aluminum wave drops markedly.

本文叙述了一個小型紡織工藝試驗室自動控制温濕度的装置的設計及安装資料。空氣經過同一噴霧室處理後,分別送至梳棉與併條、粗紡與精紡、以及織機間,使各室維持所需要的濕度,各室的溫濕度能加以調節並自動控制。文中叙述了自動控制的方法。 對試驗室的冷熱負荷、通風量、喷霧量、冷却和加熱設備、以及風道的布置都進行了具體計算,並且列出所選用的各種必要的係數值和計算公式。所選用的調節設備各機件規格附列在本文之末;房屋圍護層的結構,喷霧室的結構和風道的結構則分述於有關各段之中。 設計的條件如下: 粗紡及精紡間 夏季最高温度(最大冷負荷時) 30℃; 冬季最低温度 20.5℃; 最高相對濕度 60%。(可調節) 梳棉及併條間 夏季最高温度(最大冷負荷時) 31.5℃; 冬季最低温度 22℃; 最高相對濕度 55°%(可調節)。織機間 夏季最高温度(最大冷負荷時) 28℃; 冬季最低温度 18℃; 最高相對濕度 75°%(可調節); 車間的面積共約250平方公尺。

A device for measurement of fhe hydrodynamical pulsating pressure acting over the down stream apron of an overflow spillway is herein described, together with its main construction principles. By means of such a device in a preliminary invesitigation in our hydraulic laboratory, it is found that due to the existence of such pressure pulsation, a bloc of pavement of the apron will be set into 2-degree vibration, which ought to be taken into consideration in design. Finally, some meditations are given,...

A device for measurement of fhe hydrodynamical pulsating pressure acting over the down stream apron of an overflow spillway is herein described, together with its main construction principles. By means of such a device in a preliminary invesitigation in our hydraulic laboratory, it is found that due to the existence of such pressure pulsation, a bloc of pavement of the apron will be set into 2-degree vibration, which ought to be taken into consideration in design. Finally, some meditations are given, concerning the problem of model laws. It is proposed that the magnitude of the pulsating pressure . proportional to the linear scale of the water depth over the apron and the frequency of pulsation inversely proportional to its square root.

本文介绍一种在水工模型实验中,施测水流脉动压力的仪器,及其构造原理。 使用这种仪器进行了实验,其结果表明:由于水动压力脉动的存在,溢流坝下游的护坦 版将产生两个自由度的振动。这在设计时应予以考虑。 此外并对这灰实验的模型律总是提出如下意见:(一)脉动压力的大小与护坦上水深比 例尺成正比,(二)其脉动频率则与护坦上水深比例尺的平方根成反比。 水流的威力脉动现象已为世所公认,特别是在水流情况发生剧烈改变时(例如水跃或局部消能设备)表现尤为显著。研究这种现象不仅在紊流理论上有重要意义,而且与水工建筑物下游的护坦安全以及河床冲刷问题都有密切关系。我们水力学教研室对于水平的护坦上脉幼压力问题进行了一些实验。

 
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