scholarly journals Operation of a continuous flow liquid helium magnetic microscopy cryostat as a closed cycle system

2021 ◽  
Vol 92 (12) ◽  
pp. 123701
Author(s):  
K. Barr ◽  
T. Cookson ◽  
K. G. Lagoudakis
Keyword(s):  
Liquid Helium ◽  
Continuous Flow ◽  
Closed Cycle ◽  
Cycle System ◽  
Magnetic Microscopy

scholarly journals Effect of Temperature on Corrosion Resistance of Layered Double Hydroxides Conversion Coatings on Magnesium Alloys Based on a Closed-Cycle System

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1658
Author(s):  
Xiaochen Zhang ◽  
Zhijuan Yin ◽  
Bateer Buhe ◽  
Jiajie Wang ◽  
Lin Mao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Photoelectron Spectroscopy ◽  
Conversion Coating ◽  
Effect Of Temperature ◽  
Conversion Coatings ◽  
Closed Cycle ◽  
Cycle System ◽  
Double Hydroxide ◽  
Double Hydroxides

The effect of temperature on the corrosion resistance of layered double hydroxide (LDH) conversion coatings on AZ91D magnesium alloy, based on a closed-cycle system, was investigated. Scanning electron microscopy (SEM), photoelectron spectroscopy (XPS), and X-ray diffractometry (GAXRD) were used to study the surface morphology, chemical composition, and phase composition of the conversion coating. The corrosion resistance of the LDH conversion coating was determined through electropotentiometric polarisation curve and hydrogen evolution and immersion tests. The results showed that the conversion coating has the highest density and a more uniform, complete, and effective corrosion resistance at 50 °C. The chemical composition of the LDH conversion coating mainly comprises C, O, Mg, and Al, and the main phase is Mg6Al2(OH)16CO3·4H2O.

Thorough regeneration of organic solvent in closed-cycle system

1979 ◽  
Vol 15 (1) ◽  
pp. 10-15
Author(s):  
A. K. Manovyan ◽  
V. V. Lozin ◽  
V. A. Morozov ◽  
D. A. Khachaturova
Keyword(s):  
Organic Solvent ◽  
Closed Cycle ◽  
Cycle System

Safety interlock and vent system to alleviate potentially dangerous ice blockage of top-loading cryostat sample sticks

2013 ◽  
Vol 46 (4) ◽  
pp. 1236-1239 ◽  
Author(s):  
S. Pangelis ◽  
S. R. Olsen ◽  
J. Scherschligt ◽  
J. B. Leão ◽  
S. A. Pullen ◽  
...  
Keyword(s):  
Sample Space ◽  
Closed Cycle ◽  
Safety Hazards ◽  
Relief Valve ◽  
Pressure Relief ◽  
Cycle System ◽  
Combined Solution ◽  
Vent Tube ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator

A combined solution is presented for minimizing the safety hazards associated with closed cycle cryostats described by Swainson & Cranswick [J. Appl. Cryst.(2010),43, 206–210]. The initial solution is to install a vent tube with one open end deep inside the sample space and a pressure relief valve at the top. This solution works for either a cryogen or a cryogen-free (closed cycle) system. The second approach, which can be combined with the first and is applicable to cryogen-free cryostats, involves electrically interlocking the closed cycle refrigerator compressor to the sample space, so that the system cannot be cooled in the presence of a leak path to air.

An apparatus for visualizing continuous flow boiling in liquid helium I

Cryogenics ◽  
1977 ◽  
Vol 17 (1) ◽  
pp. 33-42 ◽  
Author(s):  
W.B. Bald ◽  
H. Zust ◽  
W.G. Wooster
Keyword(s):  
Liquid Helium ◽  
Continuous Flow ◽  
Flow Boiling

Comparison of Nuclear Power Plants With Closed-Cycle Helium Turbine and With Steam Turbine Cycle for Combined Power and Steam Generation

1973 ◽  
Vol 95 (1) ◽  
pp. 11-18 ◽  
Author(s):  
K. Bammert ◽  
R. Buende
Keyword(s):  
Steam Turbine ◽  
Nuclear Power ◽  
Power Plants ◽  
Closed Cycle ◽  
Steam Generation ◽  
Single Cycle ◽  
Cycle System ◽  
System A ◽  
Secondary Steam

The heat of a helium-cooled reactor can be used for combined power and steam generation either in a closed-cycle helium turbine system, the so-called single-cycle system, or in a two-cycle system which consists of a helium cycle and a secondary steam turbine cycle. The optimum data for the two systems are determined within the same range of general parameters—electric power output and quantity and quality of the steam produced—as functions of the special parameters of each particular cycle system. A method of comparing different power plant systems is shown. With this method it is possible to determine those ranges in which the efficiencies achieved with one system are higher than those obtained with the other. It is described in which way the dividing line between such ranges depends on the special parameters of the cycles. The comparison shows that the single-cycle system offers advantages.

scholarly journals Gas Turbine Power Plant Possibilities With a Nuclear Heat Source: Closed and Open Cycles

1990 ◽  
Author(s):  
Colin F. McDonald
Keyword(s):  
High Temperature ◽  
Power Plant ◽  
Heat Source ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Closed Cycle ◽  
Cycle System ◽  
Nuclear Heat ◽  
High Temperature Gas

With the capability of burning a variety of fossil fuels, giving high thermal efficiency, and operating with low emissions, the gas turbine is becoming a major prime-mover for a wide spectrum of applications. Almost three decades ago two experimental projects were undertaken in which gas turbines were actually operated with heat from nuclear reactors. In retrospect, these systems were ahead of their time in terms of technology readiness, and prospects of the practical coupling of a gas turbine with a nuclear heat source towards the realization of a high efficiency, pollutant free, dry-cooled power plant has remained a long-term goal, which has been periodically studied in the last twenty years. Technology advancements in both high temperature gas-cooled reactors, and gas turbines now make the concept of a nuclear gas turbine plant realizable. Two possible plant concepts are highlighted in this paper, (1) a direct cycle system involving the integration of a closed-cycle helium gas turbine with a modular high temperature gas cooled reactor (MHTGR), and (2) the utilization of a conventional and proven combined cycle gas turbine, again with the MHTGR, but now involving the use of secondary (helium) and tertiary (air) loops. The open cycle system is more equipment intensive and places demanding requirements on the very high temperature heat exchangers, but has the merit of being able to utilize a conventional combined cycle turbo-generator set. In this paper both power plant concepts are put into perspective in terms of categorizing the most suitable applications, highlighting their major features and characteristics, and identifying the technology requirements. The author would like to dedicate this paper to the late Professor Karl Bammert who actively supported deployment of the closed-cycle gas turbine for several decades with a variety of heat sources including fossil, solar, and nuclear systems.

scholarly journals Research and Development of Minor Actinide-containing Fuel and Target in a Future Integrated Closed Cycle System

2007 ◽  
Vol 44 (3) ◽  
pp. 309-316 ◽  
Author(s):  
Masahiko OSAKA ◽  
Hiroyuki SERIZAWA ◽  
Masato KATO ◽  
Kunihisa NAKAJIMA ◽  
Yoshiaki TACHI ◽  
...  
Keyword(s):  
Research And Development ◽  
Minor Actinide ◽  
Closed Cycle ◽  
Cycle System

Progress of Closed-Cycle OTEC and Study of a New Cycle of OTEC

2011 ◽  
Vol 354-355 ◽  
pp. 275-278
Author(s):  
Wei Min Liu ◽  
Feng Yun Chen ◽  
Yi Qiang Wang ◽  
Wei Jun Jiang ◽  
Ji Guang Zhang
Keyword(s):  
Temperature Difference ◽  
Thermal Efficiency ◽  
Rankine Cycle ◽  
Ammonia Solution ◽  
Ocean Temperature ◽  
Closed Cycle ◽  
Kalina Cycle ◽  
Cycle System ◽  
Working Medium ◽  
Regenerative Cycle

OTEC has the advantages of large reserves, renewable, stable and clean without pollution. However the smaller ocean temperature-difference results in the lower thermal efficiency. Based on the research of Rankine cycle, Kalina cycle, Uehara cycle, a new closed-cycle system (GuoHai cycle) has been studied, this cycle system uses ammonia-water mixtures as working medium. Indirect regenerative cycle and poor ammonia solution regenerative cycle is adopted in order to improve the thermal efficiency of the system.

Reaction path synthesis for a mass closed-cycle system

2000 ◽  
Vol 24 (2-7) ◽  
pp. 1215-1221 ◽  
Author(s):  
Mingheng Li ◽  
Shanying Hu ◽  
Yourun Li ◽  
Jingzhu Shen
Keyword(s):  
Reaction Path ◽  
Closed Cycle ◽  
Cycle System ◽  
Path Synthesis
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