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弹靶尺寸对陶瓷/金属复合装甲防护性能的影响

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爆炸与冲击 2014年第5期34卷 594-600页

作者：迟润强 Ahmad Serjouei 范峰 Idapalapati sridhar 哈尔滨工业大学土木工程学院黑龙江哈尔滨150001 School of Mechanical & Aerospace Engineering Nanyang Technological Universitysingapore639798

利用Autodyn软件开展数值模拟工作,对陶瓷/金属复合装甲的防护性能与弹靶尺寸的关系进行研究。首先,建立二维轴对称SPH-Lagrange模型,并利用实验数据验证模型有效性;在此基础上对不同几何参数的弹靶撞击进行数值模拟,分析靶板厚度、靶... 详细信息

利用Autodyn软件开展数值模拟工作,对陶瓷/金属复合装甲的防护性能与弹靶尺寸的关系进行研究。首先,建立二维轴对称SPH-Lagrange模型,并利用实验数据验证模型有效性;在此基础上对不同几何参数的弹靶撞击进行数值模拟,分析靶板厚度、靶板平面尺寸、子弹长度等对氧化铝陶瓷/铝合金复合装甲弹道极限速度的影响规律。然后,通过量纲分析,提出装甲弹道极限速度与弹靶几何参数的量纲一关系式,并在数值模拟结果的基础上建立一个装甲弹道极限速度的经验公式。

关键词：爆炸力学 SPH-Lagrange model 弹靶尺寸陶瓷/金属复合装甲弹道极限速度钨合金弹

Crystal and Molecular Structure of Ethyl 2-[(4-Hydroxy-phenyl)hydrazono]-3-oxobutanoate

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Chinese Journal of Structural Chemistry 2011年第2期30卷 186-189页

作者： Gnanasekaran Rajalakshmi Poomani Kumaradhas Mahesh Padaki Arun M Isloor Chitrakara Hegede Balasubramanium sridhar Department of Physics Periyar University Department of Chemistry National Institute of Technology-Karnataka Department of Chemistry NITTE Meenakshi Institute of Technology Laboratory of X-ray Crystallography Indian Institute of Chemical Technology

The title compound,C 12 N 2 O 4 H 14 （M r=250.3）,crystallizes in triclinic P1 space group with a=7.7709（9）,b=8.7534（11）,c=9.6958（12）,α=77.103（2）,β=80.496（2）,γ=86.726（2）o,V=633.9（1） 3,Z=2,F（000）=264,D c=1.311 Mg/m 3,μ（MoKα）=0.1 mm-1,the final R=0.056,and wR=0.15 for 2239 observed reflections （I 2σ（Ⅰ））.The molecules in the crystal are linked through O-H···O type of hydrogen bonding interaction forming an infinite chainlike *** phenylhydrazone ring and oxobutanoate groups are almost *** keto hydrazo group adopts a Z-configuration in the molecule and the torsion angle is-177.6（2）°.

关键词： molecular structure oxobutanoate phenylhydrazone Z-configuration hydrogen bonding

Nucleation and growth control for iron-and phosphorus-rich phases from a modified steelmaking waste slag

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 378-387页

作者： Juncheng Li Guoxuan Li Feng Qiu Rong Wang Jinshan Liang Yi Zhong Dong Guan Jingwei Li Seetharaman sridhar Zushu Li School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Engineering of Matter Transport and EnergyArizona State UniversityTempeAZ 85287USA WMG the University of WarwickCoventryCV47ALUK

Recovering the iron(Fe)and phosphorus(P)contained in steelmaking slags not only reduces the environmental burden caused by the accumulated slag,but also is the way to develop a circular economy and achieve sustainable development in the steel *** had pre-viously found the possibility of recovering Fe and P resources,i.e.,magnetite(Fe_(3)O_(4)) and calcium phosphate(Ca_(10)P_(6)O_(25)),contained in steel-making slags by adjusting oxygen partial pressure and adding modifier B_(2)O_(3).As a fundamental study for efficiently recovering Fe and P from steelmaking slag,in this study,the crystallization behavior of the CaO-SiO_(2)-FeO-P_(2)O_(5)-B_(2)O_(3) melt has been observed in situ,using a confocal scanning laser microscope(CLSM).The kinetics of nucleation and growth of Fe-and P-rich phases have been calculated using a classical crys-tallization kinetic *** cooling,a Fe_(3)O_(4) phase with faceted morphology was observed as the 1st precipitated phase in the isothermal interval of 1300-1150℃,while Ca_(10)P_(6)O_(25),with rod-shaped morphology,was found to be the 2nd phase to precipitate in the interval of 1150-1000℃.The crystallization abilities of Fe_(3)O_(4) and Ca_(10)P_(6)O_(25) phases in the CaO-SiO_(2)-FeO-P_(2)O_(5)-B_(2)O_(3) melt were quantified with the in-dex of(T_(U)−T_(I))/T_(I)(where T_(I) represents the peak temperature of the nucleation rate and TU stands for that of growth rate),and the crystalliza-tion ability of Fe_(3)O_(4) was found to be larger than that of Ca_(10)P_(6)O_(25) *** range of crystallization temperature for Fe_(3)O_(4) and Ca_(10)P_(6)O_(25) phases was optimized *** Fe_(3)O_(4) and Ca_(10)P_(6)O_(25) phases are the potential sources for ferrous feedstock and phosphate fertilizer,respectively.

关键词： steelmaking slag magnetite calcium phosphate nucleation growth kinetics

N-Substituted benzoxazolyl ureas and thioureas in Biginelli reaction promoted by trifluoromethane sulfonic acid:An efficient and convenient synthesis of substituted benzoxazolyl 3,4-dihydropyrimidine(1H)-(thio)-ones

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Chinese Chemical Letters 2009年第8期20卷 909-912页

作者： M.Saranga Pani M.Arjun D.sridhar K.Srinivas T.Raviprasad Department of Pharmacy Kakatiya University Department of Chemistry Kakatitya University

An efficient synthesis of 3,4-dihydropyrimidine 2 （1H）-ones and thiones （3,4-DHPMs） core was prepared by one-pot threecomponent Biginelli condensation and which was catalyzed by trifluoromethane sulfonic acid. The classical BigneUi reaction has been extended by the use of N-substituted benzoxazolyl semicarbazides and thiosemicarbazides and this method has the advantage of excellent yields and short reaction times. ？2009 M. Saranga Pard. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Trifluoromcthane sulfonic acid N-substituted scmicarbazidcs and thioscmicarbazidcs β-Ketocster Substituted benzoxazolyl 3,4-dihydropyrimidinc (IH)-(thio)-ones

基于多特征融合的SVM声学场景分类算法研究

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北京理工大学学报 2020年第1期40卷 69-75页

作者：赵薇靳聪涂中文 sridhar Krishnan 刘杉中国传媒大学信息与通信工程学院北京100024 中国传媒大学播音主持艺术学院北京100024 加拿大怀雅逊大学电气和计算机工程系多伦多M5B 2K3加拿大

针对DCASE2017挑战赛的声场环境数据集,提取梅尔频率倒谱系数(MFCC)、短时能量(SE)、声学事件似然特征(AELF)、静音时间(MT)特征,组成多特征融合矩阵,通过对比多种核函数和寻优算法,最终选取高斯径向基核函数(RK)建立支持向量机(SVM)模... 详细信息

针对DCASE2017挑战赛的声场环境数据集,提取梅尔频率倒谱系数(MFCC)、短时能量(SE)、声学事件似然特征(AELF)、静音时间(MT)特征,组成多特征融合矩阵,通过对比多种核函数和寻优算法,最终选取高斯径向基核函数(RK)建立支持向量机(SVM)模型,采用交叉验证(CV)方法进行SVM参数寻优,对15种声学场景进行分类.实验结果表明,杂货店、办公室的分类准确性达到了90%以上,平均分类准确性达到71.11%,远高于挑战赛的基线系统61%的平均分类准确性.

关键词：声学场景分类支持向量机参数寻优特征融合

Novel color center platforms enabling fundamental scientific discovery

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InfoMat 2021年第8期3卷 869-890页

作者： Victoria A.Norman sridhar Majety Zhipan Wang William H.Casey Nicholas Curro Marina Radulaski Department of Electrical and Computer Engineering University of California at DavisDavisCalifornia Department of Physics University of California at DavisDavisCalifornia Department of Chemistry Department of Earth and Planetary SciencesUniversity of California at DavisDavisCalifornia

Color centers are versatile systems that generate quantum light,sense magnetic fields and produce spin-photon *** review how these properties have pushed the limits of fundamental knowledge in a variety of scientific disciplines,from rejecting local-realistic theories to sensing superconducting phase *** the light of recent progress in material processing and device fabrication,we identify new opportunities for interdisciplinary fundamental discoveries in physics and geochemistry.

关键词： color centers magnetometry nano-sensing photonics quantum information

Progress Towards Genetics and Breeding for Minor Genes Based Resistance to Ug99 and Other Rusts in CIMMYT High-Yielding Spring Wheat

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Journal of Integrative Agriculture 2014年第2期13卷 255-261页

作者： Ravi Prakash Singh Sybil Herrera-Foessel Julio Huerta-Espino Sukhwinder Singh sridhar Bhavani Caixia Lan Bhoja Raj Basnet CIMMYT Apdo.Postal 6-641Mexico DF 06600Mexico INIFAP-CEVAMEX Apdo.Postal 10Chapingo 56230Mexico CIMMYT ICRAF BuildingNairobi 00621Kenya

Wheat rusts continue to cause significant losses worldwide despite major efforts given to their genetic control. This is due to frequent evolution and selection of virulence in pathogen overcoming the deployed race-specific resistance genes. Although the life of effective race-specific resistance genes can be prolonged by using gene combinations, an alternative approach being implemented at CIMMYT is to deploy varieties that posses adult plant resistance （APR） based on combinations of minor, slow rusting genes. When present alone, the APR genes do not confer adequate resistance especially under high disease pressure; however, combinations of 4 or 5 minor genes usually result in ＂near-immunity＂ or a high level of resistance. Although only a few APR genes are catalogued, various APR QTLs are now known and could lead to further characterization of additional genes. Four characterized genes have pleiotropic effects in conferring partial APR to all 3 rusts and powdery mildew, thus simplifying the task of breeding wheat varieties that are resistant to multiple diseases. Significant progress was made recently in developing high-yielding wheat germplasm that possesses high levels of APR to all three rusts by implementing a Mexico- Kenya shuttle breeding scheme. Parents with APR to Ug99 were hybridized with high-yielding parents that had adequate to high levels of APR to leaf rust and yellow rust. Segregating populations and advanced lines from these crosses were selected under high rust pressures in Mexico （leaf rust and yellow rust） and Kenya （Ug99 stem rust and yellow rust） to identify high- yielding progenies that possess high to adequate APR to all three rusts. International distribution of these high-yielding wheats is underway through CIMMYT intemational yield trials and screening nurseries. It is expected that several wheat varieties with APR to three rusts will be released and grown in various countries in the near-future that will allow determining the durability o

关键词： Triticum aestivum Puccinia graminis Puccinia triticina Puccinia striiformis genetics breeding wheat rustresistance

Progress in breeding for resistance to Ug99 and other races of the stem rust fungus in CIMMYT wheat germplasm

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Frontiers of Agricultural Science and Engineering 2019年第3期6卷 210-224页

作者： sridhar BHAVANI David PHODSON Julio HUERTA-ESPINO Mandeep SRANDHAWA Ravi PSINGH International Maize and Wheat Improvement Center Texcoco56237Mexico Campo Experimental Valle de México INIFAP Chapingo56230Mexico International Maize and Wheat Improvement Center ICRAF CampusNairobi00100Kenya

Races belonging to the Ug99(TTKSK) lineage of the wheat stem rust fungus, carrying complex virulence combinations, and their migration to countries in Africa,Middle East and Asia continue to pose a significant threat to global wheat *** rapid spread of additional races, e.g., TKTTF or the Digalu lineage, in several countries causing localized epidemics reminds us of the vulnerability of wheat germplasm to stem rust disease, a formidable foe referenced as early as biblical times.A global rust monitoring system reflecting increased surveillance efforts has identified 13 races within the Ug99 lineage in 13 countries and unrelated lineages are emerging, spreading and posing serious threats to wheat *** TKTTF has caused localized epidemics in Ethiopia and its variants have been recently implicated in stem rust outbreaks in *** research efforts have resulted in the identification of several new resistance genes and gene combinations for use in *** multiple adult plant resistance(APR) genes in high-yielding backgrounds and discovery of new quantitative trait loci conferring stem rust resistance has progressed in the recent years, enhancing the durability of *** gene stewardship and new generation breeding materials and cultivars that combine multiple race-specific or minor to intermediate effect APR genes,complemented by active surveillance and monitoring, have helped to limit major epidemics and increase grain yield potential in key target environments.

关键词： adult plant resistance black rust race-specific resistance Triticum aestivum

Effect of oxygen plasma treatment on the nanofiltration performance of reduced graphene oxide/cellulose nanofiber composite membranes

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Green Chemical Engineering 2021年第1期2卷 122-131页

作者： Shabin Mohammed Hanaa MHegab Ranwen Ou Shasha Liu Hongyu Ma Xiaofang Chen Tam sridhar Huanting Wang Department of Chemical Engineering Monash UniversityVIC3800Australia College of the Environment&Ecology Xiamen UniversityXiamenFujian361005China

Graphene based nanosheets have been widely used as building blocks for fabrication of superior separation membrane for water *** particular,membranes made of reduced graphene oxide(rGO)show better stability compared with graphene oxide(GO).However,densely stacked of rGO often results in low water *** this study,cellulose nanofibers(CNFs)were incorporated into the rGO laminates by vacuum filtration of dilute GO/CNF solution and thermal reduction at 150C for 1.5 *** resulting rGO/CNF membrane was treated with oxygen plasma for 1–4 min to create nanopores on the membrane surface for the purpose of enhancing nano-filtration *** results showed that the optimum membrane performance was obtained by using the equal amount of GO(31.83 mg m^(-2))and CNFs accompanied by 3 min of plasma treatment,exhibiting a pure water permeance of 37.23.9 L m^(-2)h^(-1)bar^(-1)maintaining a rejection above 90%for Acid Fuchsin(1.2×1.1 nm),Rose Bengal(1.5×1.2 nm)and Brilliant Blue(2.2×1.7 nm).

关键词： Graphene oxide Membrane Nanofiltration Cellulose nanofibers Oxygen plasma treatment