Sub-cooled liquid nitrogen cryogenic system with neon turbo-refrigerator for HTS power equipment

2014 ◽  
Author(s):  
S. Yoshida ◽  
H. Hirai ◽  
N. Nara ◽  
S. Ozaki ◽  
M. Hirokawa ◽  
...  
Keyword(s):  
Liquid Nitrogen ◽  
Cryogenic System ◽  
Power Equipment

Measuring the shock Hugoniot data of liquid nitrogen using a cryogenic system for shock compression

2020 ◽  
Vol 128 (22) ◽  
pp. 225901
Author(s):  
M. Sabeeh Akram ◽  
Zhuo-Ning Fan ◽  
Ming-Jian Zhang ◽  
Qi-Jun Liu ◽  
Fu-Sheng Liu
Keyword(s):  
Liquid Nitrogen ◽  
Shock Compression ◽  
Cryogenic System ◽  
Shock Hugoniot

Research on DC Breakdown and Flashover Characteristics of PI with Different Temperature

2016 ◽  
Vol 709 ◽  
pp. 11-14
Author(s):  
Tian Ye Niu ◽  
Jia Xin Wu ◽  
Ying Wen Li ◽  
Dong Sheng Xu ◽  
Lu Li ◽  
...  
Keyword(s):  
Liquid Nitrogen ◽  
Room Temperature ◽  
Rapid Development ◽  
Liquid Nitrogen Temperature ◽  
Power Equipment ◽  
Electrical Characteristics ◽  
Cryogenic Temperatures ◽  
Insulating Materials ◽  
Dielectric Performance ◽  
Working Performance

The electrical characteristics of insulating materials play a key role on the working performance and operation reliability of power equipment. With the rapid development of superconducting technology in recent years,the working temperature of high temperature superconducting power equipment can be controlled around the liquid nitrogen temperature. Due to its excellent dielectric performance and mechanical properties, polyimide have been widely used in power equipment at room temperature. However, polyimide, as a kind of cryogenic insulating materials, is rarely reported at present. Therefore, the study of the insulating characteristics of polyimide at the cryogenic temperatures is of great significance. The DC breakdown property and flashover performance of polyimide are tested around room temperature (300K) and liquid nitrogen temperature (78K). The results show that temperature has some effects on the DC breakdown property and flashover performance of polyimide.

1 ATM Subcooled Liquid Nitrogen Cryogenic System for Oxide Superconducting Power Transformer

1998 ◽  
pp. 1191-1198 ◽  
Author(s):  
S. Yoshida ◽  
Y. Yagi ◽  
T. Umeno ◽  
T. Ishida ◽  
Y. Kamioka ◽  
...  
Keyword(s):  
Liquid Nitrogen ◽  
Power Transformer ◽  
Cryogenic System ◽  
Subcooled Liquid

Cryogenic system with the sub-cooled liquid nitrogen for cooling HTS power cable

Cryogenics ◽  
2005 ◽  
Vol 45 (4) ◽  
pp. 272-276 ◽  
Author(s):  
Y.F. Fan ◽  
L.H. Gong ◽  
X.D. Xu ◽  
L.F. Li ◽  
L. Zhang ◽  
...  
Keyword(s):  
Liquid Nitrogen ◽  
Cryogenic System ◽  
Power Cable

Electron Probe Microanalysis of Frozen Hydrated Kidneys, Isolated Cells, and Cultured Cells

1982 ◽  
Vol 40 ◽  
pp. 402-403 ◽  
Author(s):  
Claude Lechene
Keyword(s):  
Liquid Nitrogen ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Cultured Cells ◽  
Liquid Nitrogen Temperature ◽  
Elemental Content ◽  
Isolated Cells ◽  
Renal Tubular Cells ◽  
Diamond Saw ◽  
Saw Blade

Electron probe microanalysis of frozen hydrated kidneysThe goal of the method is to measure on the same preparation the chemical elemental content of the renal luminal tubular fluid and of the surrounding renal tubular cells. The following method has been developed. Rat kidneys are quenched in solid nitrogen. They are trimmed under liquid nitrogen and mounted in a copper holder using a conductive medium. Under liquid nitrogen, a flat surface is exposed by sawing with a diamond saw blade at constant speed and constant pressure using a custom-built cryosaw. Transfer into the electron probe column (Cameca, MBX) is made using a simple transfer device maintaining the sample under liquid nitrogen in an interlock chamber mounted on the electron probe column. After the liquid nitrogen is evaporated by creating a vacuum, the sample is pushed into the special stage of the instrument. The sample is maintained at close to liquid nitrogen temperature by circulation of liquid nitrogen in the special stage.

A Liquid Nitrogen Cooled Stage for STEM

1974 ◽  
Vol 32 ◽  
pp. 444-445
Author(s):  
Louis T. Germinario
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Objective Lens ◽  
Thermal Drift ◽  
Specimen Holder ◽  
Resolution Capability ◽  
Focal Position

A liquid nitrogen stage has been developed for the JEOL JEM-100B electron microscope equipped with a scanning attachment. The design is a modification of the standard JEM-100B SEM specimen holder with specimen cooling to any temperatures In the range ~ 55°K to room temperature. Since the specimen plane is maintained at the ‘high resolution’ focal position of the objective lens and ‘bumping’ and thermal drift la minimized by supercooling the liquid nitrogen, the high resolution capability of the microscope is maintained (Fig.4).

Field-Ion Microscopy of BCC Metals: A Study of Image Differences and Topographical Variations

1973 ◽  
Vol 31 ◽  
pp. 114-115
Author(s):  
O. T. Inal ◽  
L. E. Murr
Keyword(s):  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Surface Atom ◽  
Image Brightness ◽  
Field Ion Microscopy ◽  
Topographic Features ◽  
Bcc Metals ◽  
Electron Orbital ◽  
Ion Microscopy ◽  
Field Ion Microscope

When sharp metal filaments of W, Fe, Nb or Ta are observed in the field-ion microscope (FIM), their appearance is differentiated primarily by variations in regional brightness. This regional brightness, particularly prominent at liquid nitrogen temperature has been attributed in the main to chemical specificity which manifests itself in a paricular array of surface-atom electron-orbital configurations.Recently, anomalous image brightness and streaks in both fcc and bee materials observed in the FIM have been shown to be the result of surface asperities and related topographic features which arise by the unsystematic etching of the emission-tip end forms.

The Effects of Drying Techniques on Clay-Rich Soil Texture

1974 ◽  
Vol 32 ◽  
pp. 466-467
Author(s):  
T. G. Naymik
Keyword(s):  
Critical Point ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Drying Methods ◽  
Air Drying ◽  
Freeze Dried ◽  
Critical Point Drying ◽  
Set Up ◽  
The Relationship ◽  
Quartz Grains

Three techniques were incorporated for drying clay-rich specimens: air-drying, freeze-drying and critical point drying. In air-drying, the specimens were set out for several days to dry or were placed in an oven (80°F) for several hours. The freeze-dried specimens were frozen by immersion in liquid nitrogen or in isopentane at near liquid nitrogen temperature and then were immediately placed in the freeze-dry vacuum chamber. The critical point specimens were molded in agar immediately after sampling. When the agar had set up the dehydration series, water-alcohol-amyl acetate-CO2 was carried out. The objectives were to compare the fabric plasmas (clays and precipitates), fabricskeletons (quartz grains) and the relationship between them for each drying technique. The three drying methods are not only applicable to the study of treated soils, but can be incorporated into all SEM clay soil studies.

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