scholarly journals Temperature Environmental Adaptability Research of HNIW/FOX-7 Based PBXs

2021 ◽  
Author(s):  
Guanchao Lan ◽  
Hui Chao ◽  
Na Wang ◽  
Bo Yan ◽  
Xiao Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Elastic Moduli ◽  
Crystal Form ◽  
Temperature Cycle ◽  
Maximum Increase ◽  
Thermal Stabilities ◽  
Temperature Shock ◽  
Mass Size ◽  
Environmental Adaptability ◽  
Temperature Adaptability

Abstract In this study, HNIW/FOX-7 based PBX modeling powders and PBX columns were treated by LT (low temperature), HT (high temperature), HLC (high-low temperature cycle) and HLS (high-low temperature shock) to study temperature environmental adaptability of HNIW/FOX-7 based PBXs. Then SEM, IR, XRD and DSC were used to study the variation of PBX modeling powders after LT, HT, HLC and HLS treatments; in addition, the mass, size and mechanical properties of PBX columns were characterized after different temperature adaptability treatments as well. The results indicate that the change ratios of mass and size of HNIW/FOX-7 based PBX columns are less than 1%, illustrating that mass and size of PBX columns are at acceptable level after different temperature adaptability treatments. The unevenness degree of the surface of PBX modeling powders followed the order of HLC>HT>LT>HLS, which agrees well with mass loss order. Moreover, IR and XRD results indicated that the molecular structure and crystal form of HNIW and FOX-7 did not change after different temperature adaptability treatments. Additionally, thermal stabilities of PBX modeling powders are decreased after different temperature adaptability treatments, among which HLS has the largest influence on HNIW/FOX-based PBX modeling powders. The compression strengths and elastic moduli of HNIW/FOX-based PBX columns are enhanced after different temperature adaptability treatments, among which the strength of PBX columns after HLC has the maximum increase, indicating that HLC has more significant effect on mechanical property.

Fractography, Fracture Toughness and Structural Turbulence Under Low-Temperature Shock Loading of a Nonequilibrium Titanium Alloy Ti–6Al–4V

2020 ◽  
Vol 55 (5) ◽  
pp. 633-642
Author(s):  
I. V. Vlasov ◽  
V. Ye. Yegorushkin ◽  
V. Ye. Panin ◽  
A. V. Panin ◽  
O. B. Perevalova
Keyword(s):  
Fracture Toughness ◽  
Titanium Alloy ◽  
Low Temperature ◽  
Shock Loading ◽  
Temperature Shock ◽  
Structural Turbulence

Survey of the transcriptome of Brevibacillus borstelensis exposed to low temperature shock

Gene ◽  
2014 ◽  
Vol 550 (2) ◽  
pp. 207-213 ◽  
Author(s):  
S. Tripathy ◽  
R. Sen ◽  
S.K. Padhi ◽  
D.K. Sahu ◽  
S. Nandi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Shock

scholarly journals A Flexible Rechargeable Zinc–Air Battery with Excellent Low‐Temperature Adaptability

2020 ◽  
Vol 59 (12) ◽  
pp. 4793-4799 ◽  
Author(s):  
Zengxia Pei ◽  
Ziwen Yuan ◽  
Chaojun Wang ◽  
Shenlong Zhao ◽  
Jingyuan Fei ◽  
...  
Keyword(s):  
Low Temperature ◽  
Air Battery ◽  
Temperature Adaptability

scholarly journals Two polymorphs of 1,8-dichloroanthracene

2013 ◽  
Vol 69 (2) ◽  
pp. 199-203 ◽  
Author(s):  
Peter Müller ◽  
Frank R. Fronczek ◽  
Stacey J. Smith ◽  
Teresa Mako ◽  
Mindy Levine
Keyword(s):  
Low Temperature ◽  
Crystal Packing ◽  
Three Dimensional ◽  
Crystal Form ◽  
Temperature Structure ◽  
Orthorhombic Crystal ◽  
Acta Cryst ◽  
Monoclinic Form ◽  
Compound C ◽  
Dimensional Network

A second, monoclinic, polymorph of the title compound, C14H8Cl2, has been found. In addition to the structure of this monoclinic form, the structure of the previously described orthorhombic form [Desvergne, Chekpo & Bouas-Laurent (1978).J. Chem. Soc. Perkin Trans. 2, pp. 84–87; Benites, Maverick & Fronczek (1996).Acta Cryst.C52, 647–648] has been redetermined at low temperature and using modern methods. The low-temperature structure of the orthorhombic form is of significantly higher quality than the previously published structure and additional details can be derived. A comparison of the crystal packing of the two forms with a focus on weak intermolecular C—H...Cl interactions shows the monoclinic structure to have one such interaction linking the molecules into infinite ribbons, while two crystallographically independent C—H...Cl interactions give rise to an interesting infinite three-dimensional network in the orthorhombic crystal form.

Systematic Fluid Selection for Organic Rankine Cycles and Performance Analysis for a Combined High and Low Temperature Cycle

2015 ◽  
Vol 138 (3) ◽  
Author(s):  
Maximilian Roedder ◽  
Matthias Neef ◽  
Christoph Laux ◽  
Klaus-P. Priebe
Keyword(s):  
Performance Analysis ◽  
Low Temperature ◽  
Power Plants ◽  
Waste Heat ◽  
Selection Process ◽  
Working Fluid ◽  
Temperature Cycle ◽  
Two Stage ◽  
Working Fluids ◽  
Wide Range

The organic Rankine cycle (ORC) is an established thermodynamic process that converts waste heat to electric energy. Due to the wide range of organic working fluids available the fluid selection adds an additional degree-of-freedom to the early design phase of an ORC process. Despite thermodynamic aspects such as the temperature level of the heat source, other technical, economic, and safety aspects have to be considered. For the fluid selection process in this paper, 22 criteria were identified in six main categories while distinguishing between elimination (EC) and tolerance criteria (TC). For an ORC design, the suggested method follows a practical engineering approach and can be used as a structured way to limit the number of interesting working fluids before starting a detailed performance analysis of the most promising candidates. For the first time, the selection process is applied to a two-stage reference cycle, which uses the waste heat of a large reciprocating engine for cogeneration power plants. It consists of a high temperature (HT) and a low temperature (LT) cycle in which the condensation heat of the HT cycle provides the heat input of the LT cycle. After the fluid selection process, the detailed thermodynamic cycle design is carried out with a thermodynamic design tool that also includes a database for organic working fluids. The investigated ORC cycle shows a net thermal efficiency of about 17.4% in the HT cycle with toluene as the working fluid and 6.2% in LT cycle with isobutane as the working fluid. The electric efficiency of the cogeneration plant increases from 40.4% to 46.97% with the both stages of the two-stage ORC in operation.

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