Finite element analysis of the temperature distribution within a Conduction-Cooled, MgB2-based MRI superconducting coil segment [0.03%]
基于铜冷却的MgB2核磁共振超导线圈段内的温度分布有限元分析
Danlu Zhang,Mike D Sumption,Milan Majoros et al.
Danlu Zhang et al.
Superconducting magnets used for Magnetic Resonance Imaging (MRI) scanners need to keep temperature gradients minimized in order to retain thermal and operating current margin. We have used 3D finite element analysis (FEA) simulation in COM...
An open hardware 3-D printed device for measuring tensile properties of thermoplastic filament polymers at cryogenic temperatures [0.03%]
一种开放源硬件的三维打印设备用于测量热塑性丝材聚合物在低温下的拉伸性能
Yue Liu,Ju Dong,Terrence R Tiersch et al.
Yue Liu et al.
With the emerging recognition of open scientific hardware, rapid prototyping technology such as three-dimensional (3-D) printing is becoming widely available for fields such as cryobiology, and cryopreservation, where material selection for...
Direct cooling from the regenerators of Gifford-McMahon cryocoolers, with comparison to pulse tube refrigerators [0.03%]
GM型绝热去活冷却器的直接冷凝比脉管制冷机的优势分析
Ryan Snodgrass,Joel Ullom
Ryan Snodgrass
The second-stage regenerators of pulse tube refrigerators (PTRs) are routinely used to intercept heat loads without disturbing cooling at their base temperatures, often near 4 K. Gifford-McMahon cryocoolers (GMCs) have not yet demonstrated ...
Michael R Maughan,Zachary Hacker,Thomas Murgatroyd et al.
Michael R Maughan et al.
In support of NASA's Triton Hopper project, mechanical response data for solid nitrogen are needed for concept validation and development. Available mechanical properties data is sparse with only three known indentation measurements existin...
Mechanical analysis of an MgB2 1.5 T MRI main magnet protected using Coupling Loss Induced Quench [0.03%]
使用耦合损耗引起失超保护的MgB2 1.5T磁共振成像主磁体的力学分析
Charles Poole,Abdullah Al Amin,Tanvir Baig et al.
Charles Poole et al.
Mechanical analysis of the stress and strains developed in the coils were calculated for a ten coil 1.5 T MRI magnet design with magnesium diboride (MgB2) wire protected with Coupling Loss Induced Quench (CLIQ). The temperature distribution...
Cryogenic thermal conductivity measurements on candidate materials for space missions [0.03%]
空间任务候选材料的低温热导率测量
James Tuttle,Edgar Canavan,Amir Jahromi
James Tuttle
Spacecraft and instruments on space missions are built using a wide variety of carefully-chosen materials. It is common for NASA engineers to propose new candidate materials which have not been totally characterized at cryogenic temperature...
Final Test Results for the Ground Operations Demonstration Unit for Liquid Hydrogen [0.03%]
地面液氢操作示范装置最终试验结果报告
W U Notardonato,A M Swanger,J E Fesmire et al.
W U Notardonato et al.
Described herein is a comprehensive project-a large-scale test of an integrated refrigeration and storage system called the Ground Operations and Demonstration Unit for Liquid Hydrogen (GODU LH2), sponsored by the Advanced Exploration Syste...
A New Experiment for Investigating Evaporation and Condensation of Cryogenic Propellants [0.03%]
一种用于研究低温推进剂蒸发和冷凝的新实验
K Bellur,E F Médici,M Kulshreshtha et al.
K Bellur et al.
Passive and active technologies have been used to control propellant boil-off, but the current state of understanding of cryogenic evaporation and condensation in microgravity is insufficient for designing large cryogenic depots critical to...
Operating Modes and Cooling Capabilities of the 3-Stage ADR Developed for the Soft-X-ray Spectrometer Instrument on Astro-H [0.03%]
ASTRO-H软X射线分光仪用三阶段ADR的运行模式及冷却能力研究
Peter J Shirron,Mark O Kimball,Bryan L James et al.
Peter J Shirron et al.
A 3-stage adiabatic demagnetization refrigerator (ADR)[1] is used on the Soft X-ray Spectrometer instrument[2] on Astro-H[3] to cool a 6×6 array of x-ray microcalorimeters to 50 mK. The ADR is supported by a cryogenic system[4] consisting ...
On the Effects of Thermal History on the Development and Relaxation of Thermo-Mechanical Stress in Cryopreservation [0.03%]
热历史对冷冻保存过程中热机械应力的发展和松弛的影响
David P Eisenberg,Paul S Steif,Yoed Rabin
David P Eisenberg
This study investigates the effects of the thermal protocol on the development and relaxation of thermo-mechanical stress in cryopreservation by means of glass formation, also known as vitrification. The cryopreserved medium is modeled as a...