Showing papers in "Cryogenics in 2010"

TL;DR: In this paper, 30% chopped glass fibers reinforced PEEK composites were prepared by injection molding, and then the tensile, flexural and impact properties were tested at different temperatures.

TL;DR: In this article, a tool called 4C code is developed to simulate the entire superconducting magnet system of the International Thermonuclear Experimental Reactor (ITER), with particular reference to: (1) the winding made of cable-in-conduit conductors (CICC), (2) the structures (the radial plates and the case of the toroidal field coils, for instance) and (3) the cooling circuits.

TL;DR: In this article, the effect of deep cryogenic treatment on the microstructure and properties of cold work die steel (Cr8Mo2SiV) was examined and it was shown that the hardness of the DCT specimens was higher (+0.5HRC to +2HRC) whereas the toughness was lower when compared with the conventionally treated specimens (quenching and tempering).

TL;DR: In this paper, the authors analyzed the self-pressurization with the trend of pressurization curves from experiment using liquid nitrogen with various heat leaks and liquid fractions, and the qualitative relation between transient period, heat leak and liquid fraction is suggested.

TL;DR: An overview of the NGAS cryocooler capabilities can be found in this article, where the authors provide an overview of NGAS flight cooler capabilities and their application in space applications.

TL;DR: In this article, a minitype magnetic flux pump made of high temperature superconductor has been proposed to compensate the magnetic field decay in HTS magnet and make the magnet operate in persistent current mode, this point is significant to the magnetic resonance imaging (MRI) magnets.

TL;DR: In this article, a new model called "JackPot" is proposed to analyse how and to what extend current non-uniformity among strands in a cable-in-conduit conductor affects its performance.

TL;DR: In this article, the influence of deep cryogenic treatment (DCT) on microstructure of a tool steel was studied by means of in situ obviation and carbon extraction replica technique, and it was shown that the retained austenite is present in a thin film between the laths of martensite and stably exists even during prolonged soaking time in liquid nitrogen.

TL;DR: In this paper, the authors used computational fluid dynamics (CFD) to investigate nonlinear phenomena and processes of a 300 Hz standing wave thermoacoustic engine (SWTE), which indicated that the co-axially stacked tube model was suitable for the simulation of SWTEs.

TL;DR: In this paper, the authors use an analogy to porous media to derive a correlation for the friction factor in CICCs and propose predictive correlations for the permeability and drag factor.

TL;DR: In this paper, the experimental results of a single stage MR J-T cooler with different flammable and non-flammable mixture compositions are discussed. And the authors highlight the use of pressure-enthalpy and temperature -enthalpy diagrams for these mixtures to support their experimental results.

TL;DR: In this article, a new vibration free cryostat cooled by liquid helium and a 4-K pulse tube cryocooler was introduced. But the authors did not consider the effects of the vibration on the sample cooling station.

TL;DR: An experimental investigation using a Peltier thermoelectric cooler (TEC) to cool down a cryoprobe for cryosurgery was performed in this article, where two prototypes of CRS devices consisting of 5 and 6-stage TEC modules were analyzed using a variety of electrical voltages, circulating thermostatic bath (CTB) temperatures, and heat exchanger configurations to obtain an optimum cold side temperature and temperature differences between sides of the modules.

TL;DR: In this article, a two-stage Stirling-type U-shape pulse tube cryocooler driven by a 10kW-class linear compressor was designed, built and tested.

TL;DR: In this paper, a wide range of numerical simulations has been performed, by using several types of finite element models, by comparing them with the numerical results of the different models and some comparisons with experimental tests.

TL;DR: In this article, a pulse tube type stirling machine with warm gas-driven displacer which has a displacer rod is discussed with numerical simulation when it is used as a cryogenic refrigerator, room temperature refrigerator and engine.

TL;DR: The Japanese infrared space telescope SPICA mission, following the successful Akari mission, has been studied at the concept design phase in international collaboration with ESA under the framework of the ESA Cosmic Vision 2015-2025 as discussed by the authors.

TL;DR: In this article, the authors investigated the first-order ferroelectric phase transition of BaTiO 3 and showed that a very sharp peak in heat capacity is obtained and the absolute values are shown to agree well with the previous results obtained by adiabatic calorimetry on much larger samples.

TL;DR: In this paper, the authors proposed a method to estimate the charge composition required to get the desired composition in circulation, based on 30 different charge compositions, two different heat exchangers, and two heat loads to understand the relationship between the mixture in circulation and that charged.

TL;DR: In this paper, an optimized five-component mixed refrigerant was calculated to provide a minimum isothermal enthalpy difference of 1.35 kJ/mol between 77 k and 240 k with a high pressure of 1 6 MPa and a low pressure of 0.1 MPa.

TL;DR: In this article, the effects of deep cryogenic treatment (DCT) on the internal friction (IF) in high-carbon alloy steel are investigated, and the temperature dependent internal friction of the quenched and DCT treated samples were measured in an inversed torsion pendulum with high vacuum by using free decay method.

TL;DR: In this paper, two types of mechanical cryocoolers are installed: 20 K-class double-staged Stirling (2ST) coolers and a 1K-class Joule-Thomson (JT) cooler.

TL;DR: In this paper, a modified thermoacoustic model is employed to design three single-stage Stirling-type pulse tube cryocoolers for regenerative thermodynamic systems.

TL;DR: In this paper, a new numerical model, called the Florida electro-mechanical cable model (FEMCAM), was proposed to study the influence of bending strain and current non-uniformity on the critical current and n-value of Nb3Sn strands and CICC cables.

TL;DR: In this paper, it is shown that the cable can be organized in a multizone structure with time constants determined from the basic time constants of the various cabling stages, and the effective volume fractions of the cable in which losses can be evaluated are also derived.

TL;DR: In this paper, a flat plate facing upward immersed in a liquid hydrogen pool was measured for the pressures from atmospheric to 1.1 MPa and the experimental results were compared with those of the other cryogenic liquids and also the Kutateladze's equations under saturated and subcooled conditions.

TL;DR: In this paper, a two-dimensional numerical simulation of a thermo-acoustic refrigerator driven at large amplitude is carried out, where the authors explore the growth of pressure amplitude for harmonic waves of various orders according to the growing of driving amplitude, and show the nonlinear phenomena in the refrigerator.

TL;DR: In this article, the double adiabatic demagnetization refrigerator (dADR) was built and tested under contract to the European Space Agency for its former mission XEUS (now IXO).

TL;DR: The Soft X-ray Spectrometer (SXS) is a cryogenic high-resolution Xray spectrometer onboard the Xray astronomy satellite Astro-H which will be launched in 2014.

TL;DR: In this article, the superconducting sub-millimeter-wave Limb-Emission Sounder (SMILES) is operated aboard the Japanese Experiment Module of the International Space Station (ISS) in 2009.