PROSPECTS IN ULTRALOW TEMPERATURE PHYSICS

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1264-C6-1269 ◽  
Author(s):  
A. J. Leggett
Keyword(s):  
Ultralow Temperature

Ultralow-temperature synthesis of small Ag-doped carbon nitride for nitrogen photofixation

2020 ◽  
Vol 10 (22) ◽  
pp. 7652-7660
Author(s):  
Yingzhi Wang ◽  
Rui Zhao ◽  
Fan Wang ◽  
Yong Liu ◽  
Xiaohu Yu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Carbon Nitride ◽  
Deposition Method ◽  
Temperature Synthesis ◽  
Temperature Reduction ◽  
Ultralow Temperature ◽  
Low Temperature Reduction

A low-temperature-reduction–deposition method is used to prepare homogeneously dispersed Ag0/g-C3N4 for efficient N2 photofixation.

A European ultralow temperature scale

2000 ◽  
Vol 284-288 ◽  
pp. 2004-2005 ◽  
Author(s):  
P Mohandas ◽  
D.I Head ◽  
R.L Rusby ◽  
G Schuster ◽  
A Hoffmann ◽  
...  
Keyword(s):  
Temperature Scale ◽  
Ultralow Temperature

Development of a multifunctional nanocomposite film with record-high ultralow temperature toughness and unprecedented fatigue-resistance

2021 ◽  
Author(s):  
Shuaicheng Jiang ◽  
Yanqiang Wei ◽  
Jiongjiong Li ◽  
Xiaona Li ◽  
Kaili Wang ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Spider Silk ◽  
Soybean Protein ◽  
Scale Up ◽  
Poly Vinyl Alcohol ◽  
Polar Regions ◽  
Self Healing ◽  
Fluorescent Properties ◽  
Soybean Protein Isolate ◽  
Ultralow Temperature

Abstract In the quest of materials that can tolerate extreme environments (i.e., aerospace, polar regions of earth), facile design of self-healing, high fatigue-resistant and multifunctional nanocomposite materials with excellent ultralow temperature toughness, especially by utilizing inexpensive and sustainable bioresources is still currently challengeable. In current study, we present a material that displays remarkable ultralow temperature toughness, shows excellent toughness (107.3 MJ·m-3) at − 196°C and maintains high mechanical strength in highly humid environments. This material is a spider silk-inspired, poly(vinyl alcohol) (PVA)-based, autonomous room temperature self-healable nanocomposite by complexation of boron nitride (BN), quantum dots (QDs) and soybean protein isolate grafted lignin (SPI-lignin). The fabricated material, namely PVA-BN-QDs-SPI-lignin, simultaneously exhibits outstanding tensile strength (53.3 MPa), toughness (182.8 MJ·m-3), fatigue-resistance as well as antiultraviolet and fluorescent properties and sets an impressive new record of folding-failure (900 000 times) and toughness, which are 10.6 to 45.7 times higher than other graphene-based nanocomposites. It can be impressively self-healed within only 2 minutes. Of particular interest is its facile, green, mild and inexpensive preparation method that can be easily scale up. It is believed that this work, beginning with abundant biodegradable resources, opens the door to develop biobased multifunctional materials in practical applications, such as flexible wearable materials.

scholarly journals Influence of Extreme Temperature on the Pore and Fracture Development of High-Rank Coal

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ming Yang ◽  
Jingcang Bi
Keyword(s):  
Temperature Stress ◽  
Pore Volume ◽  
Coal Sample ◽  
High Rank ◽  
Research Attention ◽  
Ultralow Temperature ◽  
Distribution Features ◽  
Fracture Development ◽  
Porosity And Permeability ◽  
Coal Reservoir

Pore and fracture structures in coals and their distribution features play an important role in the enrichment and osmosis migration of coalbed methane (CBM). The modification and antireflection of pore and fracture in coal reservoir through ultrahigh and ultralow temperature stress, such as liquid nitrogen frozen-induced cracking and thermal antireflection of coal reservoir, have attracted wide research attention. This study conducted a nuclear magnetic resonance (NMR) experiment of pore and fracture features of coal samples under two extreme temperatures (100°C, −196°C) using the Meso MR23-060H-I low-field NMR and imaging instrument. The influencing law of ultrahigh and ultralow temperature stress on pore and fracture development in high-rank coal was discussed. Results demonstrated that temperature can influence pore and fracture development of high-rank coal samples. The pore volume, porosity, and permeability of the coal sample increase after low-temperature (−196°C) treatment. The proportion of microspores decreases, the proportion of small pores increases, the proportion of mesopores remains the same, and the proportion of macrospores increases to some extent. The pore volume of coal sample decreases after high-temperature (100°C) treatment. Porosity and permeability decrease. The proportion of mesopores declines, the proportion of mesopores remains basically same, and the proportion of macrospores decreases.

scholarly journals Evaluation of radiosonde humidity sensors at low temperature using ultralow-temperature humidity chamber

2018 ◽  
Vol 15 ◽  
pp. 207-212 ◽  
Author(s):  
Byung Il Choi ◽  
Sang-Wook Lee ◽  
Sang-Bong Woo ◽  
Jong Chul Kim ◽  
Yong-Gyoo Kim ◽  
...  
Keyword(s):  
Water Vapor ◽  
Low Temperature ◽  
Response Time ◽  
Humidity Sensor ◽  
Weather Prediction ◽  
Observation Data ◽  
Humidity Sensors ◽  
Ultralow Temperature ◽  
Humidity Chamber ◽  
Sensing Characteristics

Abstract. Accurate measurements of temperature and water vapor in the upper-air are of great interest in relation to weather prediction and climate change. Those measurements are mostly conducted using radiosondes equipped with a variety of sensors that are flown by a balloon up to lower stratosphere. Reference Upper Air Network (GRUAN) has identified water vapor pressure as one of the most important measurands and has set an accuracy requirement of 2 % in terms of the mixing ratio. In order to achieve the requirement, many errors in the humidity measurement such as a temperature dependency in sensing characteristics including measurement values and response time need to be corrected because humidity sensors of radiosondes pass through low-pressure (1 kPa) and low-temperature (−80 ∘C) environments in the upper-air. In this paper, the humidity sensing characteristics of Jinyang radiosonde sensors in relation to temperature dependencies were evaluated at low temperature using a newly developed ultralow-temperature humidity chamber. The sensitivity characteristic curve of the radiosonde sensors was evaluated down to −80 ∘C, and the calibration curves of the humidity sensor and the temperature sensor were obtained. The response time of humidity sensor slowly increased from 52 to 116 s at the temperature from 20 to −40 ∘C, respectively, and then rapidly increased to almost one hour at −80 ∘C. Those results will help to improve the reliability of the upper-air observation data.

Friction behaviors of general structural steels at ultralow temperature

1996 ◽  
Vol 46 (S5) ◽  
pp. 2727-2728
Author(s):  
Qin Ouyang ◽  
Katsuzo Okada
Keyword(s):  
Structural Steels ◽  
Ultralow Temperature
Sign in / Sign up

Export Citation Format

Share Document