scholarly journals Improvement of Vapor Pressure Measuring Sensitivity by Introducing Modulated-Beam Pulse Counting Method to A High Temperature Mass Spectrometer

1980 ◽  
Vol 28 (4) ◽  
pp. 317-326 ◽  
Author(s):  
Michio Yamawaki ◽  
Masaru Yasumoto ◽  
Chuichiro Nakano ◽  
Masayoshi Kanno
Keyword(s):  
High Temperature ◽  
Vapor Pressure ◽  
Mass Spectrometer ◽  
Counting Method ◽  
Pulse Counting

A special reactor coupled with a high-temperature mass spectrometer for the investigation of the vaporization and cracking of organometallic compounds

2009 ◽  
Vol 23 (6) ◽  
pp. 793-800 ◽  
Author(s):  
Perrine Violet ◽  
Ioana Nuta ◽  
Laurent Artaud ◽  
Hervé Collas ◽  
Elisabeth Blanquet ◽  
...  
Keyword(s):  
High Temperature ◽  
Mass Spectrometer ◽  
Organometallic Compounds

scholarly journals An Optimized Pulse-Counting Method for Compensation Vector Calculation in the Automatic Balancer

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Lifang Chen ◽  
Bo Zhou ◽  
Zhaoju Li ◽  
Yixiang Guo ◽  
Ziwen Yan
Keyword(s):  
Control System ◽  
High Speed ◽  
Industrial Applications ◽  
Counting Method ◽  
Pulse Counting ◽  
High Speed Data Acquisition ◽  
One Step ◽  
High Speed Data ◽  
The Stability ◽  
Automatic Balancing

The accuracy of the counterweight positions in an automatic balancing system deeply affects dynamic balancing. Compensation vector is synthesized by the two counterweights located in the electromagnetic dual-weight automatic balancer. Therefore, if the position of the counterweight is inaccurate, it may result in a wrong adjustment and a larger imbalance of the rotor system. In this paper, an optimized pulse counting method for compensation vector calculation in an electromagnetic dual-weight balancing system is proposed based on a programmable logic controller (PLC). A propeller automatic balancing simulation test bench is used to verify the effect of the method by obtaining the positions of the counterweights and synthesizing the compensation vector in the working mode. The error is less than 1/80 which means that it does not exceed one step in the 80-position-balancer at 1200 rpm. The proposed control system can work without computers or high-speed data acquisition equipment, which improves the stability and flexibility of the control system, facilitates the design of the automatic balancing system, and shows excellent potential for industrial applications.

Geometric measurement of optical fibers with pulse-counting method

1991 ◽  
Author(s):  
Qiuhua Nie ◽  
John C. C. Nelson ◽  
Simon C. Fleming
Keyword(s):  
Optical Fibers ◽  
Counting Method ◽  
Pulse Counting ◽  
Geometric Measurement

Experimental Verification of Water Ingress in a Void by Quick Diffusion at High Reflow Temperature

2007 ◽  
Author(s):  
Seungbae Park ◽  
Haojun Zhang ◽  
Changsoo Jang
Keyword(s):  
High Temperature ◽  
Vapor Pressure ◽  
Pressure Sensor ◽  
Element Model ◽  
High Vapor Pressure ◽  
Hygroscopic Properties ◽  
Reflow Temperature ◽  
Polymer Metal ◽  
High Vapor ◽  
Underfill Material

The pop-corning failure is known to result from high vapor pressure generation inside cavities at defective interfaces of the electronic package. In order to study the phenomenon, vapor pressure inside a void at high temperature is measured using a specific specimen configuration developed for this purpose. The specimen incorporates a volume-controllable cavity at a polymer-metal interface. A pressure sensor is used to monitor pressure evolution inside the void at high temperature. An underfill material used in the configuration is characterized in terms of hygroscopic properties. The phenomenon is also simulated on a finite element model based on these properties and specimen geometry. The prediction by the numerical model well matches the measurement by pressure sensor. This corroborates the validity of the hypothesis of high vapor pressure employed in numerous existing studies that simulated the pop-corning failure.

High Temperature Sulphidation Behavior of Fe20Cr6Al-Y,Hf Steel

2008 ◽  
Vol 595-598 ◽  
pp. 763-768
Author(s):  
Martah Homa ◽  
Zbigniew Żurek
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Vapor Pressure ◽  
Phase Analysis ◽  
High Temperature Corrosion ◽  
Vapor Pressures ◽  
Scale Layer ◽  
Phase And Chemical Composition ◽  
Xrd Techniques ◽  
Scale Surface

The high temperature corrosion behavior of Fe20Cr6Al-Y,Hf steel was studied in the range of temperature 800-1000oC in H2/H2S atmospheres at pS2=10-2 ,10-3 and 10-4 Pa sulphur vapor pressures. Kinetics depend on the temperature and sulphur vapor pressure. After 24 hours the whole specimen was practically consumed because the samples were 0,06 cm thick. Morphology of the scales have been performed by SEM techniques. Phase and chemical composition have been studied by EDX and XRD techniques. It was found that scale formed on Fe20Cr6Al-Y,Hf alloy was built with porosity sulphides layer. EDX analysis of the scale surface show that the any aluminum, hafnium and yttrium sulfides were found in the formed scale layer, however small amounts of Al2S3 was detected in scale/steel interface. Also internal sulphidation was observed. A phase analysis of the formed scale revealed that it is composed mainly of an FeS, Fe7S8 phases and CrS, Cr5S6. Result were compared with data obtained on the pure Fe and Cr samples.

High temperature vapor pressure of pure plutonium

1979 ◽  
Vol 70 (5) ◽  
pp. 2310-2314 ◽  
Author(s):  
M. H. Bradbury ◽  
R. W. Ohse
Keyword(s):  
High Temperature ◽  
Vapor Pressure ◽  
High Temperature Vapor

High temperature Langmuir vaporization mass spectrometer

2003 ◽  
Vol 225 (1) ◽  
pp. 1-10 ◽  
Author(s):  
J.E. Delmore ◽  
G.F. Kessinger ◽  
D.A. Dahl ◽  
J.E. Olson
Keyword(s):  
High Temperature ◽  
Mass Spectrometer
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