The comparison of simultaneous humidity measurements by the Vaisala RS92 radiosonde and by the Cryogenic Frostpoint Hygrometer (CFH) launched at Alajuela, Costa Rica, during July 2005 reveals a large solar radiation dry bias of the Vaisala RS92 humidity sensor and a minor temperature-dependent calibration error. For soundings launched at solar zenith angles between 10° and 30°, the average dry ...

In this work, the hypothesis of taking into account a specific thermoEMF to determine degree hardening cutting tool by cryogenic is put forward, which most convenient and important value from point view information content. As result studies improving mechanical characteristics instrumental materials treatment, values absolute thermo emf were revealed depending on temperature three obtained tar...

Recently, the necessity of designing and applying tool materials that perform machining difficult-to-cut in a cryogenic treatment where demand is increasing. The objective this study to evaluate performance cryogenically treated WC-5 wt% NbC hard fabricated by pulsed current activated sintering process. densely consolidated specimens are exposed liquid nitrogen for 6, 12, 24 h. All samples exhi...

This paper presents an ultra low noise instrumentation based on a standard BiCMOS SiGe 0.35 μm ASIC operating at cryogenic temperatures. The main functions of the electronic circuit are the readout and the multiplexing of SQUIDs/TES. We report the cryogenic operation of the ASIC dedicated to the readout of a 2x4 pixel demonstrator array. We particularly emphasize on the development and the test...

Polydimethylsiloxane (PDMS) microshells/beads coated onto an electrical current-carrying wire are demonstrated for on-chip, dynamic, cryogenic temperature measurement via monitoring optical whispering-gallery mode (WGM) frequency shifts. PDMS is found to be capable of supporting WGM resonance at cryogenic temperatures down to 95 K, limited by the present lab-built cryogenic working environment....

The recent introduction of silicon-germanium (SiGe) alloys has proven exceptionally promising for achieving excellent bipolar transistor performance at cryogenic temperatures, while maintaining the cost and yield advantages traditionally associated with silicon (Si) manufacturing. In this paper we review the features of silicon-germanium heterojunction bipolar transistors (SiGe HBTs) which make...

BACKGROUND Establishing a stand-alone cryogenic test stand is of vital importance to ensure the highly reliable and available operation of superconducting radio-frequency module in a synchrotron light source. Operating a cryogenic test stand relies strongly on a capability to deliver two-phase helium along long cryogenic transfer lines. A newly constructed cryogenic test stand with flexible cry...

The paper gives an overview on the test possibilities of the Cryogenic Laboratories in BREMEN and TRAUEN of the DLR Institute of Space Systems with regard to the research and development of propellant management and storage technologies for successful future launcher and advanced cryogenic upper stage systems. To satisfy the current and future need for testing and research, different test facil...

LLE Review, Volume 103 128 Introduction A high-performance “planar” Cryogenic Target Handling System has been added to LLE’s OMEGA Laser-Fusion Facility.1 Initially designed for equation of state measurements of liquefied D2, it’s versatility enables studies of Rayleigh–Taylor instabilities, shock timing, and cryogenic hohlraum performance. The system has demonstrated a shot-to-shot cycle inter...

We have observed 1H NMR spectra of hydrogen molecules trapped inside modified fullerene cages under cryogenic conditions. Experiments on static samples were performed at sample temperatures down to 4.3 K, while magic-angle-spinning (MAS) experiments were performed at temperatures down to 20 K at spinning frequencies of 15 kHz. Both types of NMR spectra show a large increase in the intramolecula...