Studies on the synthesis and properties of nitramino compounds based on tetrazine backbones

2020 ◽  
Vol 49 (17) ◽  
pp. 5590-5596
Author(s):  
Shiyu Zhang ◽  
Guangbin Cheng ◽  
Hongwei Yang
Keyword(s):  
Energetic Compounds ◽  
Satisfactory Performance ◽  
Neutral Compound ◽  
Energetic Salts

A series of novel energetic compounds based on tetrazine-trazole and their energetic salts were synthesized. Neutral compound 4 exhibited satisfactory performance and these compounds are potential candidates for secondary explosives and propellants.

Energetic salts of 4-nitramino-3-(5-dinitromethyl-1,2,4-oxadiazolyl)-furazan: powerful alliance towards good thermal stability and high performance

2018 ◽  
Vol 6 (35) ◽  
pp. 16833-16837 ◽  
Author(s):  
Chunlin He ◽  
Gregory H. Imler ◽  
Damon A. Parrish ◽  
Jean'ne M. Shreeve
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Energetic Compounds ◽  
Good Thermal Stability ◽  
Straightforward Method ◽  
Energetic Salts

A new series of 4-nitramino-3-(5-dinitromethyl-1,2,4-oxadiazolyl)-furazan-based energetic compounds which are competitive with HMX was synthesized in four steps with an overall yield of ∼50% by using a straightforward method.

Synthesis and performance study of methylene-bridged bis(nitramino-1,2,4-oxadiazole) and its energetic salts

2019 ◽  
Vol 43 (14) ◽  
pp. 5441-5447 ◽  
Author(s):  
Yupeng Cao ◽  
Xiangyang Lin ◽  
Jun Yang ◽  
Xuedong Gong ◽  
Guijuan Fan ◽  
...  
Keyword(s):  
Energetic Compounds ◽  
Performance Study ◽  
Energetic Salts ◽  
Efficient Route ◽  
And Performance

A series of new energetic compounds based on methylene-bridged bis(nitramino-1,2,4-oxadiazole) was synthesized through a simple, safe and efficient route and fully characterized.

New pyrazole energetic materials and their energetic salts: combining the dinitromethyl group with nitropyrazole

2020 ◽  
Vol 49 (5) ◽  
pp. 1660-1667 ◽  
Author(s):  
Caijin Lei ◽  
Hongwei Yang ◽  
Guangbin Cheng
Keyword(s):  
Energetic Materials ◽  
Potassium Salt ◽  
Detonation Performance ◽  
Energetic Compounds ◽  
Energetic Salts

A series of energetic compounds based on nitropyrazole and dinitromethyl group were synthesized. The hydroxylammonium salt 7b exhibited satisfactory calculated detonation performance and the potassium salt 5 could be used as a potential green primary explosive.

Intermolecular interaction influenced energy and sensitivity of highly energetic salts: structure and physicochemical properties

CrystEngComm ◽  
2014 ◽  
Vol 16 (20) ◽  
pp. 4245-4253 ◽  
Author(s):  
Zhiyong Su ◽  
Xiangyu Liu ◽  
Qi Yang ◽  
Sheng Zhang ◽  
Qing Wei ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Intermolecular Interaction ◽  
Supramolecular Interactions ◽  
Energetic Compounds ◽  
Energetic Salts

Based on supramolecular interactions, three stable energetic compounds (TATA+)·(TZA−)·H2O, (AT+)2·(OX2−) and (DAT2+)·(NO3−)2 were synthesized and structurally characterized and their physicochemical properties theoretically and experimentally studied.

DEWARD

Alloy Digest ◽  
1976 ◽  
Vol 25 (12) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
Heat Treating ◽  
Die Steel ◽  
Satisfactory Performance ◽  
Specialty Steel ◽  
Minimum Distortion

Abstract DEWARD is an oil-hardening, non-deforming, manganese die steel that is characterized by uniformity, good machinability and satisfactory performance in service. Its composition permits a relatively low hardening temperature to give minimum distortion after heat treatment and little danger of cracking. It has good wear resistance and gives excellent results when used for all kinds of intricate tools. This datasheet provides information on composition, physical properties, hardness, elasticity, and compressive strength as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-310. Producer or source: AL Tech Specialty Steel Corporation.

SMART IDENTIFICATION OF POWER QUALITY EVENTS USING NEW STOCKWELL TRANSFORM AND MACHINE LEARNING ALGORITHM

2019 ◽  
Vol XVI (4) ◽  
pp. 95-113
Author(s):  
Muhammad Tariq ◽  
Tahir Mehmood
Keyword(s):  
Machine Learning ◽  
Power Quality ◽  
Learning Algorithm ◽  
Machine Learning Algorithm ◽  
Noisy Environments ◽  
Satisfactory Performance ◽  
Feature Values ◽  
Learning Machine ◽  
Stockwell Transform ◽  
Electrical Utilities

Accurate detection, classification and mitigation of power quality (PQ) distortive events are of utmost importance for electrical utilities and corporations. An integrated mechanism is proposed in this paper for the identification of PQ distortive events. The proposed features are extracted from the waveforms of the distortive events using modified form of Stockwell’s transform. The categories of the distortive events were determined based on these feature values by applying extreme learning machine as an intelligent classifier. The proposed methodology was tested under the influence of both the noisy and noiseless environments on a database of seven thousand five hundred simulated waveforms of distortive events which classify fifteen types of PQ events such as impulses, interruptions, sags and swells, notches, oscillatory transients, harmonics, and flickering as single stage events with their possible integrations. The results of the analysis indicated satisfactory performance of the proposed method in terms of accuracy in classifying the events in addition to its reduced sensitivity under various noisy environments.

Biotransformation of nitrocellulose under methanogenic conditions

1996 ◽  
Vol 34 (5-6) ◽  
pp. 327-334 ◽  
Author(s):  
David L. Freedman ◽  
Bryan M. Caenepeel ◽  
Byung J. Kim
Keyword(s):  
Biological Treatment ◽  
Enrichment Culture ◽  
Basal Medium ◽  
Anaerobic Biodegradation ◽  
Anaerobic Treatment ◽  
Acid Digestion ◽  
Energetic Compounds ◽  
Nitrate Ester ◽  
Digestion Technique ◽  
Aerobic And Anaerobic

Treatment of wastewater containing nitrocellulose (NC) fines is a significant hazardous waste problem currently facing manufacturers of energetic compounds. Previous studies have ruled out the use of biological treatment, since NC has appeared to be resistant to aerobic and anaerobic biodegradation. The objective of this study was to examine NC biotransformation in a mixed methanogenic enrichment culture. A modified cold-acid digestion technique was used to measure the percentage of oxidized nitrogen (N) remaining on the NC. After 11 days of incubation in cultures amended with NC (10 g/L) and methanol (9.9 mM), the % N (w/w) on the NC decreased from 13.3% to 10.1%. The presence of NC also caused a 16% reduction in methane output. Assuming the nitrate ester on NC was reduced to N2, the decrease in CH4 represented almost exactly the amount of reducing equivalents needed for the observed decrease in oxidized N. An increase in the heat of combustion of the transformed NC correlated with the decrease in % N. There was no statistically significant decrease in % N when only NC was added to the culture, or in controls that contained only the sulfide-reduced basal medium. The biotransformed NC has a % N comparable to nonexplosive nitrated celluloses, suggesting that anaerobic treatment may be a technically feasible process for rendering NC nonhazardous.

Fault Tree Analysis for a Modern Communication System

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Kamal Hamid ◽  
Nadim Chahine
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Theory And Practice ◽  
Tree Analysis ◽  
Satisfactory Performance ◽  
System Components ◽  
Link Budget ◽  
Simulation Results

Wireless communications became one of the most widespread means for transferring information. Speed and reliability in transferring the piece of information are considered one of the most important requirements in communication systems in general. Moreover, Quality and reliability in any system are considered the most important criterion of the efficiency of this system in doing the task it is designed to do and its ability for satisfactory performance for a certain period of time, Therefore, we need fault tree analysis in these systems in order to determine how to detect an error or defect when happening in communication system and what are the possibilities that make this error happens. This research deals with studying TETRA system components, studying the physical layer in theory and practice, as well as studying fault tree analysis in this system, and later benefit from this study in proposing improvements to the structure of the system, which led to improve gain in Link Budget. A simulation and test have been done using MATLAB, where simulation results have shown that the built fault tree is able to detect the system’s work by 82.4%.

Three energetic salts based on oxy-bridged bis( gem -dinitro) furazan: Syntheses, structures and thermal behaviors

2014 ◽  
Vol 423 ◽  
pp. 256-262 ◽  
Author(s):  
Hui Li ◽  
Feng-Qi Zhao ◽  
Hong-Xu Gao ◽  
Jun-Feng Tong ◽  
Bo-Zhou Wang ◽  
...  
Keyword(s):  
Thermal Behaviors ◽  
Energetic Salts
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