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Energy and blast performance of beryllium in a model thermobaric composition in comparison with aluminum and magnesium

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Defence Technology（防务技术） 2024年第6期36卷 13-19页

作者： thomas m.klapotke Stanisław Cudziło Waldemar A.Trzcinski Jozef Paszula Energetic materials Research Department of ChemistryUniversity of Munich(LMU)Butenandtstrasse 5-13(D)81377MunichGermany military University of Technology Faculty of Advanced Technologies and ChemistrySylwester Kaliski Str.200-908WarsawPoland

A direct comparison is made between the effectiveness of Al,mg,and Be powders as additional fuels in model thermobaric compositions containing 20%fuel,20%ammonium perchlorate,and 60%RDX(1,3,5-Trinitro-1,3,5-triazacyclohexane)passivated with *** determined calorimetric measurements of the heat of detonation,along with the overpressure histories in an explosion chamber filled with nitrogen,were used to determine the quasi-static pressure(QSP)under anaerobic *** measurements were also performed in a semi-closed bunker,and all blast wave parameters generated after the detonation of 500 g charges of the tested explosives were *** calorimetry results,QSP values,and blast wave parameters(pressure amplitude,specific and total impulses)clearly indicate that Be is much more effective as an additional fuel than either Al or mg in both anaerobic post-detonation reactions as well as the subsequent aerobic *** heat of detonation of the RDXwax/AP/Be explosive mixture is over 40%and 50%higher than that of the mixture containing aluminum and magnesium instead of beryllium,***,the TNT equivalent of the Be-containing composition due to the overpressure in the nitrogen-filled explosion chamber is 1.66,while the equivalent calculated using an air shock wave-specific impulse at a distance of 2.5 m is equal to *** high values of these parameters confirm the high reactivity of beryllium in both the anaerobic and aerobic stages of the thermobaric explosion.

关键词： Thermobaric explosives Beryllium Heat of detonation Quasi-static overpressure Blast wave parameters

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Use of Intermetallic Alloys as Reactive materials for Warhead Applications

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火炸药学报 2015年第6期38卷 8-10页

作者： Jürgen Evers thomas m.klaptke Department of Chemistry Energetic Materials ResearchLMU Munich

With this communication we want to suggest the system ZrW2,a high-density and very hard intermetallic compound that reacts/burns highly exothermic with air at high *** intermetallic phase should provide a very suitabl... 详细信息

关键词： Cermisch metal intermetallic phase thermites reactive structure material warhead

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Energy and blast performance of beryllium in a model thermobaric composition in comparison with aluminum and magnesium

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Defence technology 2024年第6期 13页

作者： thomas m.klap?tke Stanis?aw Cudzi?o Waldemar A.Trzciński Józef Paszula

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Synthesis and characterization of a 1,3-dibutylimidazolium azide（[BBIm][N3]） : A promising green energetic ionic liquid

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Defence technology 2024年第8期 1页

作者： Nawel matmat Amir Abdelaziz Djalal Trache Achour Sabrina Ahmed Fouzi Tarchoun Hani Boukeciat Sourbh Thakur Weiqiang Pang thomas m.klapötke

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Chemical design and characterization of cellulosic derivatives containing high-nitrogen functional groups:Towards the next generation of energetic biopolymers

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Defence Technology（防务技术） 2022年第4期18卷 537-546页

作者： Ahmed Fouzi Tarchoun Djalal Trache thomas m.klapotke Amir Abdelaziz mehdi Derradji Slimane Bekhouche Energetic materials Laboratory Teaching and Research Unit of Energetic ProcessesEcole Militaire PolytechniqueBP 17Bordj El-Bahri16046AlgiersAlgeria Energetic Propulsion Laboratory Teaching and Research Unit of Energetic ProcessesEcole Militaire PolytechniqueBP 17Bordj El-Bahri16046AlgiersAlgeria Department of Chemistry Ludwig Maximilian University Butenandtstrasse 5-13(D)D-81377MunichGermany Process Engineering Laboratory Teaching and Research Unit of Energetic ProcessesEcole Militaire PolytechniqueBP 17Bordj El-Bahri16046AlgiersAlgeria

In this research,a promising class of insensitive and high-energy dense biopolymers,which contain nitrogen-rich 1H-tetrazol-1-yl acetate and nitrate ester functional groups,was successfully synthesized through tetrazole derivatization and nitration of cellulose and its micro-sized derivative(TNCN and TCmCN).Their molecular structures,physicochemical properties,thermal behaviors,mechanical sensitivities and detonation performances were studied and compared to those of the corresponding nitrocellulose and nitrated micro-sized cellulose(NCN and CmCN).The developed energetic TNCN and TCmCN exhibited insensitive character with excellent features such as density of 1.710 g/cm3and 1.726 g/cm3,nitrogen content of 20.95%and 22.59%,and detonation velocity of 7552 m/s and 7786 m/s,respectively,and thereby demonstrate their potential applications as new generation of energetic biopolymers to substitute the common ***,thermal results showed that the designed nitrated and chemical modified cellulosic biopolymers displayed good thermal stability with multistep decomposition *** results enrich future prospects for the design of promising insensitive and high-energy dense cellulose-rich materials and commence a new chapter in this field.

关键词： Cellulose Surface functionalization Tetrazole Nitrate ester Nitrogen-rich polymer Energetic properties

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Chemical design and characterization of cellulosic derivatives containing high-nitrogen functional groups: Towards the next generation of energetic biopolymers

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Defence technology 2022年第4期

作者： Ahmed Fouzi Tarchoun Djalal Trache thomas m.klap?tke Amir Abdelaziz mehdi Derradji Slimane Bekhouche

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Biotransformation of 6:2 fluorotelomer sulfonate(6:2 FTS)in sulfur-rich media by Trametopsis cervina

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Frontiers of Environmental Science & Engineering 2024年第9期18卷 17-26页

作者： Felix Grimberg thomas m Holsen Sujan Fernando Siwen Wang Department of Civil and Environmental Engineering Clarkson UniversityPotsdamNew York 13699USA

Biotransformation of 6:2 fluorotelomer sulfonate(6:2 FTS)by two species of white-rot fungi,Pleurotus ostreatus(***)and Trametopsis cervina(***),was investigated in a sulfurrich medium designed to stimulate production of lignin-degrading *** of 6:2 FTS was observed by *** over the study period of 30 d,but not by *** rates were comparable to those found in other studies investigating mixed culture degradation in nonsulfur limiting media,with approximately 50 mol%of applied 6:2 FTS removed after 30 *** transformation products were short-chain perfluorocarboxylic acids(PFCAs),including PFHxA(2.27 mol%),PFPeA(0.24 mol%),and PFBA(0.28 mol%).The main intermediate products include 5:2 sFTOH(16.3 mol%)and 5:3 FTCA(2.99 mol%),while 6:2 FTCA,6:2 FTuCA,and 5:2 ketone were also identified at low *** 60 mol%of detected products were assigned to the major pathway to 5:2 ketone,and 40 mol%were assigned to the minor pathway to 5:3 *** overall molar balance was found to decrease to 75 mol%by Day 30,however,was closed to near 95 mol%with a theoretical estimation for the volatile intermediates in the headspace,5:2 ketone and 5:2 *** different capabilities of the two white-rot fungal species for 6:2 FTS biotransformation in sulfur-rich media suggest that the enzyme processes of *** to de-sulfonate 6:2 FTS may be unrelated to sulfur metabolism.

关键词： White-rot fungus 6:2 fluorotelomer sulfonate(6:2 FTS) Biotransformation Sulfur-rich medium Intermediate products

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Impact of increasing one-carbon metabolites on traumatic brain injury outcome using pre-clinical models

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Neural Regeneration Research 2024年第8期19卷 1728-1733页

作者： Sanika m.Joshi Theresa Currier thomas Nafisa m.Jadavji College of Osteopathic medicine Midwestern UniversityGlendaleCAUSA Department of Biomedical Sciences Midwestern UniversityGlendaleCAUSA Department of Child Health College of Medicine–PhoenixUniversity of ArizonaPhoenixAZUSA College of Veterinary medicine Midwestern UniversityGlendaleCAUSA Department of Neuroscience Carleton UniversityOttawaCanada

Traumatic brain injury is a major cause of death and disability worldwide,affecting over 69 million individuals ***-carbon metabolism has been shown to have beneficial effects after brain damage,such as ischemic ***,whether increasing one-carbon metabolite vitamins impacts traumatic brain injury outcomes in patients requires more *** aim of this review is to evaluate how one-carbon metabolites impact outcomes after the onset of traumatic brain ***,Web of Science,and Google Scholar databases were searched for studies that examined the impact of B-vitamin supplementation on traumatic brain injury *** search terms included combinations of the following words:traumatic brain injury,dietary supplementation,one-carbon metabolism,and *** focus of each literature search was basic science *** year of publication in the literature searches was not *** analysis of the literature has shown that dietary supplementation of B-vitamins has significantly improved the functional and behavioral recove ry of animals with traumatic brain injury compared to *** r,this improvement is dosage-dependent and is contingent upon the onset of supplementation and whether there is a sustained or continuous delive ry of vitamin supplementation post-traumatic brain *** details of supplementation post-traumatic brain injury need to be further ***,we conclude that B-vitamin supplementation improves behavioral outcomes and reduces cognitive impairment post-traumatic brain injury in animal model *** investigation in a clinical setting should be stro ngly considered in co njunction with current medical treatments for traumatic brain injury-affected individuals.

关键词： folic acid nicotinamide one-carbon metabolism riboflavin traumatic brain injury vitamin B12 vitamin B2 vitamin B3

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Applying machine Learning Approach to Explore Childhood Circumstances and Self-Rated Health in Old Age-China and the US,2020-2021

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China CDC weekly 2024年第11期6卷 213-218,I0008-I0013页

作者： Shutong Huo Derek Feng thomas m.Gill Xi Chen Department of Health Society&BehaviorPublic HealthUniversity of CaliforniaIrvineCAUSA Department of Statistics and Data Science Yale UniversityNew HavenCTUS Department of Internal medicine Yale School of MedicineNew HavenCTUS Department of Health Policy and management Yale School of Public HealthNew HavenCTUS Department of Economics Yale UniversityNew HavenCTUS.

Introduction:Childhood circumstances impact senior health,prompting the introduction of machine learning methods to assess their individual and collective contributions to senior ***:Using health and retirement study(HRS)and China Health and Retirement Longitudinal Study(CHARLS),we analyzed 2,434 American and 5,612 Chinese participants aged 60 and *** inference trees and forests were employed to estimate the influence of childhood circumstances on self-rated health(SRH).Results:The conventional method estimated higher inequality of opportunity(IOP)values in both China(0.039,accounting for 22.67%of the total Gini coefficient 0.172)and the US(0.067,accounting for 35.08%of the total Gini coefficient 0.191).In contrast,the conditional inference tree yielded lower estimates(China:0.022,accounting for 12.79%of 0.172;US:0.044,accounting for 23.04%of 0.191),as did the forest(China:0.035,accounting for 20.35%of 0.172;US:0.054,accounting for 28.27%of 0.191).Childhood health,financial status,and regional differences were key determinants of senior *** conditional inference forest consistently outperformed others in predictive accuracy,as demonstrated by lower out-of-sample mean squared error(mSE).Discussion:The findings emphasize the need for early-life interventions to promote health equity in aging *** learning showcases the potential in identifying contributing factors.

关键词： collective inequality estimates

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Gabor Analysis on Finite Product of Cyclic Groups

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Journal of mathematical Research with Applications 2024年第4期44卷 521-532页

作者： Jineesh thomas N.m.madhavan NAmBOOTHIRI Ajo JOSE Research Scholar of mathematics St.Thomas College Palai Professor and Principal Government Arts & Science College Idukki

We present a complete characterization of Gabor frame operators on finite dimensional Hilbert space L2（Γ）,where■and m1,m2,...,mpare positive *** notion of generalized B-modulation and generalized B-translation is ... 详细信息

关键词： Gabor frame Gabor frame operator modulation translation

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