Results 51 to 60 of about 26,639 (302)

Cryogenic Cooling in Wireless Communications

open access: yesEntropy, 2019
Improving the capacity and performance of communication systems is typically achieved by either using more bandwidth or enhancing the effective signal-to-noise ratio (SNR).
Tomasz G. Markiewicz   +1 more
doaj   +1 more source

A novel relaxation drift model for simulating liquid-vapor momentum non-equilibrium in two-phase ejectors

open access: yesCase Studies in Thermal Engineering, 2023
A novel relaxation drift model (RDM) was proposed to simulate the interphase momentum non-equilibrium (slip) inside two-phase work-recovery CO2 ejectors.
Junan Long   +5 more
doaj   +1 more source

Improved liquid-level sensor for cryogenics [PDF]

open access: yes, 1969
Liquid-level indicator, consisting of a diode heated by a resistor, allows simultaneous use of two or three of the liquids nitrogen, hydrogen, and helium.
Hyman, L. G.   +2 more
core   +1 more source

Cryogenic magnetometer research at Twente University of Technology [PDF]

open access: yes, 1984
In 1982 we started the project ‘Cryogenic Magnetometers’ with the aim to develop SQUID-magnetometers appropriate to a large variety of applications.
Brake, H.J.M. ter, Flokstra, J.
core   +3 more sources

MOFs and COFs in Electronics: Bridging the Gap between Intrinsic Properties and Measured Performance

open access: yesAdvanced Functional Materials, EarlyView.
Metal‐organic frameworks (MOFs) and covalent organic frameworks (COFs) hold promise for advanced electronics. However, discrepancies in reported electrical conductivities highlight the importance of measurement methodologies. This review explores intrinsic charge transport mechanisms and extrinsic factors influencing performance, and critically ...
Jonas F. Pöhls, R. Thomas Weitz
wiley   +1 more source

Numerical Thermal Analysis and 2-D CFD Evaluation Model for An Ideal Cryogenic Regenerator

open access: yesMicromachines, 2020
Regenerative cryocoolers such as Stirling, Gifford–McMahon, and pulse tube cryocoolers possess great merits such as small size, low cost, high reliability, and good cooling capacity.
Natheer Almtireen   +2 more
doaj   +1 more source

Influence of the voltage taps position on the self-field DC and AC transport characterization of HTS superconducting tapes

open access: yes, 2013
The current-voltage (I-V) curve is the basic characteristic of a superconducting wire or tape. Measuring I-V curves is generally problematic when samples have poor stabilization.
Goldacker, W.   +4 more
core   +1 more source

Rapid Sintering of Porous Organic Polymer Powders Into Mechanically Strong Monoliths for Efficient CO2 Capture

open access: yesAdvanced Functional Materials, EarlyView.
Spark plasma sintering enables rapid processing of porous organic polymer (POP) from fine powders to a freestanding and mechanically robust monolith. The sintering process retains the CO2 adsorption capacity and CO2/N2 selectivity, making the monolith more suitable as a solid sorbent for practical carbon capture applications.
Duan Li   +4 more
wiley   +1 more source

A Novel Fuel-Based CO2 Transcritical Cycle for Combined Cooling and Power Generation on Hypersonic Aircrafts

open access: yesEnergies
This study focuses on the great challenges for combined cooling and power supply on hypersonic aircrafts. To address the issues of low thermal efficiency and high fuel consumption of heat sink by the existing CO2 supercritical Brayton cycle, a novel fuel-
Yijian He   +3 more
doaj   +1 more source

Electrodynamic sources of non-uniform heat production in composite superconductors causing instabilities [PDF]

open access: yes, 1992
Model calculations of the electrodynamic properties of superconducting composites are usually carried out assuming that the material constants, such as critical current density and resistivity, are uniform over the cross-section of the composite, or at ...
Klundert, L.J.M. van de
core   +3 more sources

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