scholarly journals Helium-4 magnetometers for room-temperature biomedical imaging: toward collective operation and photon-noise limited sensitivity

2021 ◽  
Vol 29 (10) ◽  
pp. 14467
Author(s):  
William Fourcault ◽  
Rudy Romain ◽  
Gwenael Le Gal ◽  
François Bertrand ◽  
Vincent Josselin ◽  
...  
Keyword(s):  
Biomedical Imaging ◽  
Room Temperature ◽  
Photon Noise ◽  
Helium 4 ◽  
Limited Sensitivity

scholarly journals Photon-noise limited sensitivity in titanium nitride kinetic inductance detectors

2015 ◽  
Vol 106 (7) ◽  
pp. 073505 ◽  
Author(s):  
J. Hubmayr ◽  
J. Beall ◽  
D. Becker ◽  
H.-M. Cho ◽  
M. Devlin ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Kinetic Inductance Detectors ◽  
Kinetic Inductance ◽  
Photon Noise ◽  
Limited Sensitivity

scholarly journals Room-temperature continuous-wave upconverting micro- and nanolasing for bio-optofluidics

2020 ◽  
Vol 238 ◽  
pp. 07005
Author(s):  
Angel Fernandez-Bravo ◽  
Liliana Moscardi ◽  
Aaron M. Ross ◽  
Guglielmo Lanzani ◽  
Emory M. Chan ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Biomedical Imaging ◽  
Large Scale ◽  
Room Temperature ◽  
Continuous Wave ◽  
Optoelectronic Devices ◽  
Pulsed Excitation ◽  
Cavity Loss ◽  
Low Threshold ◽  
Quantum Photonics

Nanolasers that operate under the continuous-wave pump and are robust in diverse environments will make possible compact optoelectronic devices, biomedical imaging, and large-scale quantum photonics. However, current nanolasers require low temperatures or pulsed excitation because their small mode volumes severely limit gain relative to cavity loss. Here, I will present continuous-wave upconverting micro- and nanolasing at room temperature with record-low thresholds and high photostability. I will explore the future implications of such a low-threshold laser for optofluidics.

scholarly journals Helium-3 Purification System And Acoustic Cavity For Concentration Determination

2020 ◽  
Vol 21 (2) ◽  
Author(s):  
Carlos Banuelos Perez ◽  
Wenguang Jiang
Keyword(s):  
Data Analysis ◽  
Speed Of Sound ◽  
Room Temperature ◽  
Filtering Method ◽  
Acoustic Cavity ◽  
Concentration Determination ◽  
Helium 4 ◽  
Purification System ◽  
Sample Data ◽  
Helium 3

This paper discusses a filtering method of using differential adsorption to purify helium-3 (3He) from a helium-4 (4He) impurity. In addition, the paper discusses the precision of an acoustic cavity in determining the concentration of a mixture through measuring the speed of sound for a given sample. Data analysis will include measurements at room temperature in air at 1 atm, 4He at ≈ 1.2 x 105 Pa and 1.6 x 105 Pa, and Nitrogen at ≈ 1.0 x 105 Pa.

Near-room-temperature photon-noise-limited quantum well infrared photodetector

2014 ◽  
Vol 8 (2) ◽  
pp. 297-302 ◽  
Author(s):  
Ming Rui Hao ◽  
Yao Yang ◽  
Shuai Zhang ◽  
Wen Zhong Shen ◽  
Harald Schneider ◽  
...  
Keyword(s):  
Quantum Well ◽  
Room Temperature ◽  
Infrared Photodetector ◽  
Photon Noise ◽  
Quantum Well Infrared Photodetector

scholarly journals High optical efficiency and photon noise limited sensitivity of microwave kinetic inductance detectors using phase readout

2013 ◽  
Vol 103 (20) ◽  
pp. 203503 ◽  
Author(s):  
R. M. J. Janssen ◽  
J. J. A. Baselmans ◽  
A. Endo ◽  
L. Ferrari ◽  
S. J. C. Yates ◽  
...  
Keyword(s):  
Kinetic Inductance Detectors ◽  
Kinetic Inductance ◽  
Optical Efficiency ◽  
Microwave Kinetic Inductance Detectors ◽  
Photon Noise ◽  
Limited Sensitivity

NbN Vacuum Bridge Bolometer Arrays With Room Temperature Readout Approaching Photon Noise Limited THz Imaging Applications

2007 ◽  
Vol 17 (2) ◽  
pp. 310-313 ◽  
Author(s):  
P. Helisto ◽  
J.S. Penttila ◽  
H. Sipola ◽  
L. Gronberg ◽  
F. Maibaum ◽  
...  
Keyword(s):  
Room Temperature ◽  
Thz Imaging ◽  
Photon Noise ◽  
Bolometer Arrays

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

Domain Formation in Synthetic Quartz

1971 ◽  
Vol 29 ◽  
pp. 156-157
Author(s):  
Joseph J. Comer
Keyword(s):  
Electron Beam ◽  
Room Temperature ◽  
Domain Formation ◽  
Synthetic Quartz ◽  
Transmission Electron ◽  
Black Spots ◽  
Diffraction Mode ◽  
Domain Boundaries ◽  
Kikuchi Lines ◽  
Straight Lines

Domains visible by transmission electron microscopy, believed to be Dauphiné inversion twins, were found in some specimens of synthetic quartz heated to 680°C and cooled to room temperature. With the electron beam close to parallel to the [0001] direction the domain boundaries appeared as straight lines normal to <100> and <410> or <510> directions. In the selected area diffraction mode, a shift of the Kikuchi lines was observed when the electron beam was made to traverse the specimen across a boundary. This shift indicates a change in orientation which accounts for the visibility of the domain by diffraction contrast when the specimen is tilted. Upon exposure to a 100 KV electron beam with a flux of 5x 1018 electrons/cm2sec the boundaries are rapidly decorated by radiation damage centers appearing as black spots. Similar crystallographio boundaries were sometimes found in unannealed (0001) quartz damaged by electrons.

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