scholarly journals AE from plastics. 1 Monitoring of GFRP dewar vessel by means of AE method.

1987 ◽  
Vol 22 (1) ◽  
pp. 50-54 ◽  
Author(s):  
Shigehiro NISHIJIMA ◽  
Toichi OKADA ◽  
Koji FUJIOKA ◽  
Yasuo KURAOKA
Keyword(s):  
Dewar Vessel

scholarly journals An investigation of the effects of variations in the radiation factor on the efficiency of dewar vessels

1926 ◽  
Vol 112 (760) ◽  
pp. 136-151
Keyword(s):  
Hot Water ◽  
Liquid Oxygen ◽  
Radiation Factor ◽  
Research Committee ◽  
Spherical Type ◽  
Glass Vessel ◽  
A Value ◽  
Dewar Vessel ◽  
Rate Of Cooling ◽  
Rate Of Evaporation

During the course of some work on Dewar vessels, which was carried out by one of us (B. L.) and S. F. Gates for the Oxygen Research Committee, a curious anomaly was noticed in the behaviour of an all-metal Dewar vessel. This was a commercial copper vessel of the usual spherical type with a long narrow neck of an alloy of low heat-conductivity; its capacity was two litres. The rate of evaporation of liquid oxygen stored in this vessel was approximately double that of liquid oxygen stored in a silvered glass flask of like capacity; but, when equal weights of hot water were put into each of the vessels, it was found that the rate of cooling of the water in the copper vessel was actually slower than in the silvered glass vessel. It appeared, then, that the copper vessel was only half as efficient as a silvered glass one of like capacity for the storage of liquid oxygen, whereas its efficiency for the storage of hot water was greater than that of the silvered glass vessel. This investigation arose out of a desire to explain the apparent anomaly. Previou work on the factors which influence the efficiency of Dewar vessels has been carried out by Dewar ('Proc. Roy. Inst.,' 1898, p. 815), Banneitz, Rhein and Kurze ('Ann. d. Phys.,' 1920, vol. 61, p. 113), and Briggs ('Proc. Roy. Soc. Edin.,' 1920, vol. 51, p. 97). These investigations have dealt with the efficiency of Dewar vessels considered only as containers for liquid air or oxygen, and the above-mentioned anomaly has therefore not been noticed. Briggs ( loc. cit .) worked with vessels with the vacuum-adjacent surfaces of polished gilding metal (95 per cent. copper). From his results on the rates of evaporation of liquid oxygen from these vessels, he calculated a value for the emissivity of the polished surfaces which was considerably greater than that anticipated from the usually accepted value for copper. This observation is intimately connected with that of Lambert and Gates and will be referred to later.

Research on the LN2 auto-filling system for dewar vessel based on Bang-Bang + PID control

2010 ◽  
Author(s):  
Shuhua Ma ◽  
Junjie Wang ◽  
Jinkuan Wang ◽  
Cheng Cui ◽  
Yiding Zhao
Keyword(s):  
Pid Control ◽  
Dewar Vessel ◽  
Filling System

A helium dewar vessel without nitrogen cooling

Cryogenics ◽  
1966 ◽  
Vol 6 (2) ◽  
pp. 106-107 ◽  
Author(s):  
O.P. Anashkin ◽  
I.B. Danilov ◽  
V.G. Krivenko
Keyword(s):  
Dewar Vessel

933. The Dewar vessel for liquid helium

Vacuum ◽  
1971 ◽  
Vol 21 (9) ◽  
pp. 435
Keyword(s):  
Liquid Helium ◽  
Dewar Vessel

A dewar vessel for use in a 1 in. bore magnet

Cryogenics ◽  
1965 ◽  
Vol 5 (3) ◽  
pp. 172-173
Author(s):  
J.A Good
Keyword(s):  
Dewar Vessel

Thermochemical Determination of Glucose in Serum, Plasma, and Whole Blood without Prior Deproteinization

1975 ◽  
Vol 21 (6) ◽  
pp. 741-745 ◽  
Author(s):  
C David McGlothlin ◽  
Joseph Jordan
Keyword(s):  
Dynamic Range ◽  
Direct Injection ◽  
Sample Pretreatment ◽  
Linear Dynamic Range ◽  
Linear Dynamic ◽  
Dewar Vessel ◽  
Quantitation Method ◽  
Electrical Calibration

Abstract Glucose can be determined by phosphorylatlon in the presence of hexokinase (EC 2.7.1.1) by using Mg2+/ (ATP)2- as the phosphorylating agent. A novel instrumental quantitation method is described, direct injection enthalpimetry, whereby the heat of the enzymatically catalyzed reaction was measured. The reaction was allowed to proceed to virtual completion (99.5+%) in an adiabatic Dewar vessel at 25.00 ± 0.01 °C (range). Samples were sequentially injected into a reaction mixture consisting of hexokinase, ATP, Mg2+, and a tris(hydroxymethyl)aminomethane buffer (pH 8). Single analyses required <2 min for 0-3 g/liter samples. The linear dynamic range was 0.3-10 g/liter, with zero intercept and a precision and accuracy of 2%. Electrical calibration in situ obviated the need for chemical standards, and because protein and color do not interfere, no sample pretreatment was necessary before analysis.

Cryogenic Dewar vessel

Vacuum ◽  
1966 ◽  
Vol 16 (4) ◽  
pp. 209-209
Author(s):  
Spembly Technical Products Limite
Keyword(s):  
Dewar Vessel

Design of a triaxial bayonet for connecting a helium liquefier cold box and receiver Dewar vessel

2014 ◽  
Vol 39 (1) ◽  
pp. 64 ◽  
Author(s):  
Tejas Rane ◽  
Naseem Ahmed ◽  
Rajendran S Menon ◽  
M M Jadhav ◽  
Anindya Chakravarty
Keyword(s):  
Dewar Vessel ◽  
Helium Liquefier ◽  
Cold Box

A helium Dewar vessel without nitrogen cooling

Vacuum ◽  
1967 ◽  
Vol 17 (2) ◽  
pp. 115
Keyword(s):  
Dewar Vessel

scholarly journals A Small Transfer and Distribution System for Liquid Nitrogen

10.14311/184 ◽  
2001 ◽  
Vol 41 (1) ◽  
Author(s):  
Č. Šimáně ◽  
M. Vognar ◽  
J. Kříž ◽  
V. Němec
Keyword(s):  
Liquid Nitrogen ◽  
Distribution System ◽  
Nitrogen Level ◽  
Frequency Change ◽  
Dewar Vessel ◽  
Central Storage

A system for remotely controlled filling of small Dewars with liquid nitrogen from a central storage Dewar vessel is described, consisting of a plunger type pump with an electromechanical driver and electromechanical ball type valves for distribution of liquid nitrogen. The preset nitrogen level in the small Dewars is kept constant by automatic refilling. The delivery is adjustable in steps by frequency change from 2.5 to 25 cm3/s, and delivery height up to 2 meters is assured.

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