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Assessing the energy release characteristics during the middle detonation reaction stage of aluminized explosives

Defence Technology（防务技术） 2024年第3期33卷 270-277页

作者： Kun Yang Lang Chen Danyang Liu Bin Zhang Jianying Lu junying wu State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

Afterburning behind the detonation front of an aluminized explosive releases energy on the millisecond timescale,which prolong the release of detonation energy and the energy release at different stages also shows significant ***,at present,there are few effective methods for evaluating the energy release characteristics of the middle reaction stage of such explosives,which can have a duration of tens to hundreds of *** present work demonstrates an approach to assessing the midstage of an aluminized explosive detonation based on a water push test employing a high degree of *** this method,the explosive is contained in a steel cylinder having one end closed that is installed at the bottom of a transparent water *** detonation,the gaseous products expand in one direction while forcing water ahead of *** resulting underwater shock wave and the interface between the gas phase products and the water are tracked using an ultra-high-speed framing and streak *** shock wave velocity in water and the expansion work performed by the gaseous detonation products were calculated to assess the energy release characteristics of aluminized explosives such as CL-20 and RDX in the middle stage of the detonation *** the middle stage of the detonation process of these aluminized explosives,the aluminum reaction reduced the attenuation of shock waves and increased the work performed by gas phase products.A higher aluminum content increased the energy output while the presence of oxidants slowed the energy release *** work demonstrates an effective means of evaluating the performance of aluminized explosives.

关键词： Aluminized explosive Non-ideal detonation Water push test Energy release

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Carboxy Cellulose as Cathode Interfacial Layer for Efficient Organic Solar Cells

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Paper And Biomaterials 2020年第1期5卷 14-21页

作者： Yanjun Liu Cheng Hu junying wu Amjad Islam Xinhua Ouyang College of Materials Engineering Fujian Agriculture and Forestry UniversityFuzhouFujian Province350002China

Green, biodegradable, and eco-friendly interface materials based on cellulose and its derivatives were prepared for organic solar cells(OSCs). In this work, calcium and two derivatives of cellulose with different carboxy acid groups, denoted as Cellulose-COOH and Cellulose-(COOH)n, were used as cathode interfacial layers of OSCs, and a blend of the low-band-gap semiconducting polymers thieno[3, 4-b]thiophene/benzodithiophene(PTB7)and [6, 6]-phenyl C71-butyric acid methyl ester(PC71BM) was chosen as the photoactive layer. OSCs were fabricated with a configuration of indiumdoped tin oxide(ITO)/poly(3, 4-ethylenedioxythiophene) : polystyrene sulfonate(PEDOT: PSS)/PTB7: PC71BM/Ca or Cellulose-COOH or Cellulose-(COOH)n/Al. As a result, the effect of cellulose-COOH was the best one among them, and the power conversion efficiency(PCE) reached 8.21%for the devices with cathode interfacial layer of Cellulose-COOH, which was better than that of OSCs using calcium as a modifier(PCE=7.95%). The favorable performance is attributed to the reduced work function and improved electron transfer caused by the introduction of carboxy cellulose between the active layer and the electrode. The developed technology shows great potential in accelerating the diversified applications of cellulose and producing cost-effective and eco-friendly interfaces for OSCs.

关键词： carboxy cellulose cathode interfacial layer organic solar cell

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Characteristics of a plasma flow field produced by a metal array bridge foil explosion

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Plasma Science and Technology 2018年第7期20卷 127-138页

作者： junying wu Long WANG Yase LI Lijun YANG Manzoor SULTAN Lang CHEN State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081People＇s Republic of China

To improve the energy utilization efficiency of metal bridge foil explosion, and increase the function range of plasmas, array bridge foil explosion experiments with different structures were performed. A Schlieren photographic measurement system with a double-pulse laser source was used to observe the flow field of a bridge foil explosion. The evolution laws of plasmas and shock waves generated by array bridge foil explosions of different structures were analyzed and compared. A multi-phase flow calculation model was established to simulate the electrical exploding process of a metal bridge foil. The plasma equation of state was determined by considering the effect of the changing number of particles and Coulomb interaction on the pressure and internal energy. The ionization degree of the plasma was calculated via the Saha-Eggert equation assuming conditions of local thermal equilibrium. The exploding process of array bridge foils was simulated, and the superposition processes of plasma beams were analyzed. The variation and distribution laws of the density, temperature, pressure, and other important parameters were obtained. The results show that the array bridge foil has a larger plasma jet diameter than the single bridge foil for an equal total area of the bridge foil. We also found that the temperature, pressure, and density of the plasma jet＇s center region sharply increase because of the superposition of plasma beams.

关键词： array bridge foil electrical exploding plasma shock wave numerical simulation

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氮肥对不同类型裸燕麦品种碳氮代谢的影响

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西北农林科技大学学报(自然科学版) 2025年第2期53卷 40-48页

作者：张宇赵宝平柳妍娣齐冰洁苑志强米俊珍刘景辉武俊英内蒙古农业大学农学院内蒙古呼和浩特010019 内蒙古农业大学职业技术学院内蒙古包头014000

【目的】探究施氮量对裸燕麦碳氮代谢的影响,明确影响不同裸燕麦品种穗粒数形成差异的氮素调控措施。【方法】选取穗粒数差异大的2个裸燕麦品种坝莜1号(穗粒数多)和定莜8号(穗粒数少)为试验材料,于2021-2022年采用随机区组设计进行大田... 详细信息

【目的】探究施氮量对裸燕麦碳氮代谢的影响,明确影响不同裸燕麦品种穗粒数形成差异的氮素调控措施。【方法】选取穗粒数差异大的2个裸燕麦品种坝莜1号(穗粒数多)和定莜8号(穗粒数少)为试验材料,于2021-2022年采用随机区组设计进行大田试验,设置0,100和200 kg/hm ^(2)3个施氮水平,测定和分析了不同氮素供应条件下裸燕麦干物质积累量、碳代谢相关酶活性、籽粒全氮含量、氮代谢相关酶活性及其对籽粒产量的差异。【结果】①施氮对2个裸燕麦品种的籽粒产量具有增加效应,其中在施氮100 kg/hm ^(2)时产量最高。②在100 kg/hm ^(2)施氮处理下,坝莜1号的干物质积累量、蔗糖磷酸合成酶(SPS)活性、蔗糖合成酶(SS)活性、籽粒全氮含量、谷氨酰胺合成酶(GS)活性、硝酸还原酶(NR)活性和籽粒产量两年平均值较不施氮处理分别提高54.30%,33.35%,22.73%,6.05%,19.65%,23.64%和40.15%,定莜8号分别提高54.90%,34.60%,38.36%,4.66%,17.27%,12.88%和37.36%。施氮量对2个裸燕麦品种碳氮代谢的调控优势主要体现在灌浆期。③相关性分析表明,坝莜1号籽粒产量与碳氮代谢参数均呈显著正相关关系,尤其与碳代谢中SPS活性呈极显著正相关;定莜8号籽粒产量与氮代谢参数呈显著正相关关系,尤其与GS活性呈极显著正相关。【结论】增施氮肥对2个裸燕麦品种均有显著正向影响,坝莜1号表现出更优的碳氮代谢活性,实现碳氮代谢与产量同步正相关,SPS活性对产量的提高起主导作用;对定莜8号碳代谢影响较小,但生育后期的氮代谢优势较强,体现在较高的GS活性,从而弥补穗粒数少的不足,提高了籽粒产量。

关键词：裸燕麦施氮量干物质积累量碳氮代谢籽粒产量

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Generation of laser-driven flyer dominated by shock-induced shear bands:A molecular dynamics simulation study

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Chinese Physics B 2022年第2期31卷 285-292页

作者： Deshen Geng Danyang Liu Jianying Lu Chao Chen junying wu Shuzhou Li Lang Chen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Nanyang Technological UniversitySingapore

High-power pulsed lasers provide an ingenious method for launching metal foils to generate high-speed flyers for high-pressure loading in material science or aerospace *** high-temperature and high-pressure laser-induced conditions,the dynamic response of the metals and the mechanism of flyer formation remain *** this study,the overall process of the laser-driven aluminum flyer,including laser ablation,rupture of metal foil,and the generation of the flyer was investigated by molecular dynamics combined with the two-temperature *** was found that under high laser fluence(over 1.3 J/cm;with 200-fs laser pulse duration),the laser induced a shock wave with a peak pressure higher than25 GPa,which led to shear bands expanding from the edge of the laser ablation zone in the *** with the cases of low laser fluence less than 0.5 J/cm^(-1),the shear band induced by high laser fluence promotes the rupture of the foil and results in a high-speed flyer(>1 km/s)with better flatness and *** addition,the shock wavefront was found to be accompanied by aluminum crystal phase transformation from face-centered cubic(FCC)to body-centered cubic *** crystal structure reverts with the decrease of pressure,therefore the internal structure of the generated flyer is pure of *** results of this study provide a better understanding of the laser-induced shock effect on the foil rupture and flyer quality and forward the development of the laser-driven flyer.

关键词： laser-aluminum interaction laser-induced shock wave phase transition

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Sequencing and alignment of mitochondrial genomes of Tibetan chicken and two lowland chicken breeds

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Science China(Life Sciences) 2008年第1期51卷 47-51页

作者： BAO HaiGang, ZHAO ChunJiang, LI junying & wu ChangXin College of Animal Science and Technology, China Agricultural University, Beijing 100094, China 1. College of Animal Science and Technology China Agricultural University Beijing 100094 China

Tibetan chicken lives in high-altitude area and has adapted well to hypoxia genetically. Shouguang chicken and Silky chicken are both lowland chicken breeds. In the present study, the complete mito-chondrial genome sequences of the three chicken breeds were all sequenced. The results showed that the mitochondrial DNAs (mtDNAs) of Shouguang chicken and Silky chicken consist of 16784 bp and 16785 bp respectively, and Tibetan chicken mitochondrial genome varies from 16784 bp to 16786 bp. After sequence analysis, 120 mutations, including 4 single nucleotide polymorphisms (SNPs) in tRNA genes, 9 SNPs and 1 insertion in rRNA genes, 38 SNPs and 1 deletion in D-LOOP, 66 SNPs in pro-tein-coding genes, were found. This work will provide clues for the future study on the association between mitochondrial genes and the adaptation to hypoxia.

关键词： Tibetan chicken lowland chicken mitochondrial genome hypoxia

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基于学科馆员制的高校图书馆核心竞争力构建

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情报杂志 2005年第6期24卷 129-131页

作者：吴君瑛华侨大学图书馆泉州362021

在阐述高校图书馆“学科馆员”的基本内涵及其发展状况的基础上,分析了高校图书馆“学科馆员”的成因及其运行架构,并结合高校图书馆核心竞争力的构成要素,提出通过实施“学科馆员”制度,增强我国高校图书馆核心竞争力的建议和对策。

关键词：高校图书馆核心竞争力学科馆员制 “学科馆员”制度发展状况基本内涵构成要素

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浑善达克沙地公路机械沙障防风固沙效益分析

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干旱区资源与环境 2010年第12期24卷 161-166页

作者：武俊瑛高永内蒙古农业大学呼和浩特010019

以穿越浑善达克沙地省际通道两侧公路防护带为试验区,以黄柳(Salix gordejevii *** et Skv.)和小红柳(Salix microstachya Turcz.)为主要材料设置的高立式柳条沙障阻沙带和半隐蔽式方格沙障固沙带构成的公路沙障带的防风固沙效益为研究... 详细信息

以穿越浑善达克沙地省际通道两侧公路防护带为试验区,以黄柳(Salix gordejevii *** et Skv.)和小红柳(Salix microstachya Turcz.)为主要材料设置的高立式柳条沙障阻沙带和半隐蔽式方格沙障固沙带构成的公路沙障带的防风固沙效益为研究对象,通过对公路两侧不同沙害发生地段的沙障带内风速、输沙量测定,分析风速变化、防风效益和地表粗糙度以及风沙流结构。结果表明:在平缓流沙地、风蚀窝状沙坑、挖方段沙质陡坡等主要公路沙害地段,风速在沙障带带内及其上空,都表现出较强的线形规律,其中沙障带在平缓流沙地风速变化线形规律最强,风速在50m宽的阻沙带中心及固沙带内显著降低,粗糙度渐增,防风效能提高。高立式柳条沙障阻沙带阻聚外源流沙主要发生于阻沙带前锋26m宽范围内,防护带其余近公路54m宽流沙地得到有效控制,表面保持稳定。

关键词：浑善达克沙地公路沙害阻沙带固沙带防护效益

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Shock ignition of composite explosives heated to various temperatures

Shock ignition of composite explosives heated to various tem...

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中国力学大会——2013

作者： wu junying Liu Qun Chen Lang Lu Feng State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

This study investigated the shock ignition characteristics of PBXC10(HMX/TATB)composite explosives heated to various *** densities,intemal void contents,and shock Hugoniot relationships of the explosives at various initial temperatures were obtained.A theoretical calculation method for the shock ignition process of the heated explosives under flyer plate impact was established in which both heat from the

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整合4P与4C营销组合的数字图书馆营销策略

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图书馆 2009年第3期 86-88页

作者：吴俊英湖南人文科技学院图书馆湖南娄底417000

本文阐述了4P与4C营销组合的概念与数字图书馆的营销理念,尝试性地运用STP营销战略理论为数字图书馆提供整体营销的初步规划,探析了传统的4P营销组合策略在数字图书馆营销中的应用,最后提出了全新的在4P基础上整合4C的数字图书馆营销组... 详细信息

本文阐述了4P与4C营销组合的概念与数字图书馆的营销理念,尝试性地运用STP营销战略理论为数字图书馆提供整体营销的初步规划,探析了传统的4P营销组合策略在数字图书馆营销中的应用,最后提出了全新的在4P基础上整合4C的数字图书馆营销组合策略。

关键词：数字图书馆 4P与4C营销组合营销策略

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