US scientists discover two new subatomic particles
A team of US scientists led by Petar Maksimovic, Assistant Professor of Physics at Johns Hopkins University, has discovered two new subatomic particles.
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Air Products’ mobile hydrogen fueling technology in use in California
Air Products' mobile hydrogen fueling technology helped fuel vehicles in Southern California from October 4 to 8, as part of the California Fuel Cell Partnership's Road Rally 2006.
Praxair introduces remote system for monitoring cryogenic containers
Praxair, Inc. recently introduced a new, patented remote monitoring system for world-wide monitoring of cryogenic containers.
Oy AGA Ab acquires Messer Suomi Oy
Oy AGA Ab, a subsidiary of Linde, has acquired Messer Suomi Oy, the Finnish industrial gases company in the Messer Group.
John R. Hull joins Boeing’s Phantom Works division
CSA member John R. Hull has joined Boeing's Superconductivity, Electromagnetics Flywheel Energy Storage Phantom Works in Seattle. He was previously with Argonne National Laboratory.
John M. Ulliman joins AMSC
John M. Ulliman has joined American Superconductor Corporation as vice president of Business Development and Government Relations. Ulliman was previously employed with Northrop Grumman Corporation.
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Regenerators
Regenerators or regenerative heat exchangers are a key component of cryocoolers such as pulse tube cryocoolers (Cold Facts, August 2014). Regenerator performance greatly affects the coefficient of performance of cryocoolers. Improvements in regenerator design and, in particular, regenerator materials have been an important factor in the improvement of the performance...
Pulse Tube Cryocoolers
The development of pulse tube cryocoolers has been a significant topic of research and development over the past 20 or so years. Pulse tube cryocoolers have a number of advantages over other types of cryocoolers and are now available commercially. In order to understand pulse tube cryocoolers, it’s best to...
Thermal Expansion
Thermal expansion refers to the change in size (length or volume) that a material undergoes as its temperature changes. In cryogenic systems this effect can be quite large and must be allowed for in the design. In isotropic materials, which include most engineering materials, the thermal expansion is the same...
Air Separation and Liquefaction
by Nils Tellier, PE, President, EPSIM Corporation (CSA CSM) nils@epsim.us All illustrations courtesy EPSIM Corporation Background History of Air Separation and Liquefaction This section builds on a rich history of methods to develop deep refrigeration and cryogenic liquefaction during the 19th Century. You are encouraged to read Cryo Central’s History...
Bose-Einstein Condensate
A Bose-Einstein condensate, first proposed in 1925 by Albert Einstein based on work done by Satyendra Nath Bose (the same Bose from whom the term boson is derived), is a super-cold state of matter in which almost all of the individual atoms have “condensed” down to the lowest possible quantum...
Cold Technology for Pest Control
While it does not reach temperatures cold enough to be called cryogenic, carbon dioxide snow is at the heart of a new way of dealing with unwanted pests. It utilizes a quick freezing process that takes advantage of the properties of carbon dioxide snow and has a number of benefits...
Cryogenic Finishing
The following 3 articles discuss the uses and procedures of various type of cryogenic finishing. 1) By Robin A. Rhodes, Cryogenic Institute of New England, Inc. rrhodes@nitrofreeze.com Cryogenic Deflashing is employed to remove undesired residual mold flash that remains on molded parts after they are removed or ejected from the...
Suppliers of regenerator materials
I was looking for suppliers of regenerator materials. Can you please provide a list of vendors for: • Lead spheres • Bronze screen discs • Rare earth materials and spheres Thank you in advance for any help you can provide.
Containing ice accumulation while recovering helium
We are implementing a system to recover helium from our Janis ST-500 continuous flow LHe cryostat. The recovery system uses standard 1/4″ plastic tubing, which we connect directly to the cryostat’s exhaust port. The problem with this setup is that the gas is still quite cold as it leaves the...
Looking for some advice regarding cryogenic modeling in ANSYS FEA software
I am looking for some advice regarding cryogenic modeling in ANSYS FEA software. I have been trying to use the Transient Thermal module, in workbench 14.5, to model the cooling of a device in a dilution fridge. I have approximate values for the cooling power of each plate in the...
Compensators and/or accumulators: Are they used in cryogenics?
Are compensators and/or accumulators, high or low pressure, used in cryogenics? Are they used in space?