检索结果-南通市图书馆

Investigation of hydroxyl-terminated polybutadiene propellant breaking characteristics and mechanism impacted by submerged cavitation water jet

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 559-572页

作者： wenjun zhou Meng Zhao Bo liu Youzhi Ma Youzhi Zhang Xuanjun Wang Zhijian Laboratory Rocket Force University of EngineeringXi’an710025China

A submerged cavitation water jet(SCWJ)is an effective method to recycle solid propellant from obsolete solid engines by the breaking *** propellant's breaking modes and mechanical process under SCWJ impact are *** study aims to understand those impact breaking *** hydroxyl-terminated polybutadiene(HTPB)propellant was chosen as the research material,and a self-designed test system was used to conduct impact tests at four different working *** high-speed camera characterized crack propagation,and the DIC method calculated strain change during the impact ***,micro and macro fracture morphologies were characterized by scanning electron microscope(SEM)and computed tomography(CT)*** results reveal that the compressive strain concentration region locates right below the nozzle,and the shear strain region distributes symmetrically with the jet axis,which increases to 4% at first 16th ms,the compressive strain rises to 2% and 6% in the axial and transverse direction,*** two tensile cracks formed first at the compression strain concentrate region,and there generate many shear cracks around the tensile cracks,and those shear cracks that develop and aggregate cause the cracks to become wider and cut through the tensile cracks,forming the tensile-shear cracks and the impact parts eventually *** HTPB propellant forms a breaking hole shaped conical after impact 10 *** mass loss increases by 17 times at maximum,with the working pressure increasing by three ***,the damage value of the breaking hole remaining on the surface increases by 7.8 times while 2.9 times in the depth of the breaking *** breaking efficiency is closely affected by working *** failure modes of HTPB impacted by SCWJ are classified as tensile crack-dominated and tensile-shear crack-dominated damage mechanisms.

关键词： Submerged cavitation water jet Hydroxyl-terminated polybutadiene propellant Breaking characteristics Failure modes

Role of bitter contributors and bitter taste receptors:a comprehensive review of their sources,functions and future development

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第4期13卷 1806-1824页

作者： Xinyue zhou Han Wang Ming Huang Jin Chen Jianle Chen Huan Cheng Xingqian Ye wenjun Wang Donghong liu College of Biosystems Engineering and Food Science National-Local Joint Engineering Laboratory of Intelligent Food Technology and EquipmentZhejiang Key Laboratory for Agro-Food ProcessingZhejiang Engineering Laboratory of Food Technology and EquipmentFuli Institute of Food ScienceZhejiang UniversityHangzhou 310058China Innovation Center of Yangtze River Delta Zhejiang UniversityJiashan 314100China Ningbo Research Institute Zhejiang UniversityNingbo 315100China Changshan Aijia Huyou Food Research and Development Center Changshan 324200China The Collaborative Innovation Center for Intelligent Production Equipment of Characteristic Forest Fruits in Hilly and Mountainous Areas of Zhejiang Province Hangzhou 311300China

Bitterness,one of the 5“basic tastes”,is usually undesired by ***,abundant literature reported that bitter fruits and vegetables have beneficial health effects due to their bitter *** review provided an updated overview of the main bitter contributors of typical bitter fruits and vegetables and their health *** main bitter contributors,including phenolics,terpenoids,alkaloids,amino acids,nucleosides and purines,were *** bioactivities and wide range of beneficial effects of them on anti-cancers,anti-inflammations,anti-microbes,neuroprotection,inhibiting chronic and acute injury in organs,as well as regulating behavior performance and metabolism were ***,not only did the bitter taste receptors(taste receptor type 2 family,T2Rs)show taste effects,but extra-oral T2Rs could also be activated by binding with bitter components,regulating physiological activities via modulating hormone secretion,immunity,metabolism,and cell *** review provided a new perspective on exploring and explaining the nutrition of bitter foods,revealing the relationship between the functions of bitter contributors from food and *** trends may focus on revealing the possibility of T2Rs being targets for the treatment of diseases,exploring the mechanism of T2Rs mediating the bioactivities,and making bitter foods more acceptable without getting rid of bitter contributors.

关键词： Bitter contributors Bitter taste receptor Health benefits Fruits Vegetables

Characteristics of rural domestic sewage discharge and their driving mechanisms: evidence from the Northern Region, china

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第7期18卷 47-58页

作者： Jianguo liu Ziyu zhou Pengyu Li Zixuan Wang Ying Yan Xuezheng Yu Wenkai Li Tianlong Zheng Yingnan Cao wenjun Wu Wenqian Cai Zhining Shi Junxin liu Key Laboratory of Environmental Pollution Control and Remediation at Universities of Inner Mongolia Autonomous Region College of Resources and Environmental EngineeringInner Mongolia University of TechnologyHohhot 010051China State Key Laboratory of Environmental Aquatic chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China university of Chinese Academy of Sciences Beijing 100049China SCEGC No.12 Construction Engineering Group Co. Ltd.Ankang 725000China State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation Chinese Academy of Environmental PlanningBeijing 100041China Technical Centre for Soil Agriculture and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China Sustainable Infrastructure and Resource Management(SIRM) UniSA STEMUniversity of South AustraliaSouth AustraliaMawson LakesSA 5095Australia

The traits of rural domestic sewage emission are unclear,negatively affecting rural domestic sewage treatment and sewage *** study used data from the Second National Pollution Source Census Bulletin to establish a data *** spatial distribution characteristics and main factors influencing rural sewage discharge in the Northern Region were studied using spatial autocorrelation analysis and structural *** findings demonstrated that(l)a significant Spearman correlation between drainage water volume(DwV),chemical oxygen demand(COD),ammonia nitrogen(NH_(3)-N),total nitrogen(TN),and total phosphorus(TP)and that the correlation coefficients between DWV and COD,NH,-N,TNand TP were 0.87**,1.0**,0.99**,0.99**,respectively;(2)rural sewage discharge showed spatial autocorrelation,and rural domestic sewage discharge in the districts and counties with an administration was significantly higher than in the surrounding areas;and(3)social development was the main driver rural domestic sewage changes(path coefficient was 0.407**),and the main factors influencing rural domestic sewage discharge were the urbanization rate,years of education,and population age *** study obtained the spatial variation law and clarified the main influencing factors of rural domestic sewage to provide data support and a theoretical basis for subsequent rural sewage collection and *** of the Inner Mongolia Autonomous Region in northern china as a typical case,provides a theoretical foundation for scientific decision-making on rural domestic sewage treatment at the national and regional levels and offers new perspectives for managing pollutants.

关键词： Rural domestic sewage Emission characteristics Spatial autocorrelation analysis Influencing factors

Activation of dislocations in Mg with solute Y

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第3期12卷 1045-1053页

作者： Alireza Maldar Leyun Wang Boyu liu wenjun liu Zhaohui Jin Bijin zhou Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Advanced Photon Source Argonne National LaboratoryIL 60439USA Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Mechanical Engineering Suzhou University of Science and TechnologySuzhou 215009China

Mg-Y cast alloy shows excellent ductility(elongation to failure>15%)compared with pure Mg and commercial Mg cast *** monitoring the microstructure evolution during an in situ tensile test of a Mg-2.5 wt%Y alloy,we identify the activation of prismaticslip,which is rare in *** X-ray micro-beam Laue diffraction(μ-Laue)and transmission electron microscopy revealed the morphology of prismaticslip bands and individual*** functional theory and molecular dynamics calculations indicate that solute Y can significantly reduce the stacking fault energy(SFE)alongdirection on prismatic plane in Mg lattice and thus facilitate the nucleation ofdislocations during *** presence of freedislocations in the Mg lattice can also lead to nucleation of{10–12}twins even under unfavorable geometric conditions.

关键词： alloy microstructure ductility

Tacrolimus combined with arsenic trioxide provides a three-in-one drug-eluting coronary stent integrating anti-restenosis,pro-endothelialization and anti-inflammation

在线全文

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2024年第1期21卷 110-119页

作者： Yaojia Zhang Hongchi Yu Li Deng Zhe Hou Jie Yang Fei Fang Michael ZMiao wenjun Li Xin Shen Dongyun Hao Xiaoyi Ma Lifeng zhou Fugui He Xiaoheng liu a1Institute of Biomedical Engineering West China School of Basic Medical Sciences&Forensic MedicineSichuan UniversityChengdu610041China Division of Oral&Craniofacial Health Sciences Adams School of DentistryUniversity of North Carolina at Chapel HillNC27599USA Beijing Key Laboratory of Cardiac Drug Device Technology and Evidence Based Medicine Beijing100021China

The limitations of current drug-eluting stent technologies in selectively inhibiting vascular smooth muscle cell proliferation,which often leads to inflammation,call for innovative approaches in coronary artery disease *** the present work,we propose a revolutionary solution:a three-in-one platform for vascular stents,combining arsenic trioxide(ATO)and tacrolimus(TAC)to address anti-proliferation,pro-endothelialization,and anti-inflammation *** findings demonstrate that the synergistic action of ATO and TAC effectively suppresses aberrant vascular smooth muscle cell proliferation and mitigates endothelial cell ***,the combination treatment of TAC/ATO enhances endothelial cell migration and adhesion ***,our TAC/ATO-eluting stent exhibits superior re-endothelialization and anti-restenosis effects in a rabbit and porcine stent implantation *** in vitro and in vivo results solidify the notion that the TAC/ATO-eluting stent ensures rapid re-endothelialization and significantly reduces the incidence of in-stent ***,this study represents a promising and novel multifunctional platform with immense potential in the therapy of coronary artery disease.

关键词： Tacrolimus Arsenic trioxide Drug-eluting stent

Machine learning for parameters diagnosis of spark discharge by electro-acoustic signal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第8期26卷 64-72页

作者：熊俊卢诗宇刘晓明周文俊查晓明裴学凯 State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityWuhan 430072People’s Republic of China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300131People’s Republic of China

Discharge plasma parameter measurement is a key focus in low-temperature plasma *** diagnostics often require costly equipment,whereas electro-acoustic signals provide a rich,non-invasive,and less complex source of discharge *** study harnesses machine learning to decode these *** establishes links between electro-acoustic signals and gas discharge parameters,such as power and distance,thus streamlining the prediction *** building a spark discharge platform to collect electro-acoustic signals and implementing a series of acoustic signal processing techniques,the Mel-Frequency Cepstral Coefficients(MFCCs)of the acoustic signals are extracted to construct the *** machine learning models(Linear Regression,k-Nearest Neighbors,and Random Forest)are introduced and applied to the predictors to achieve real-time rapid diagnostic measurement of typical spark discharge power and discharge *** models display impressive performance in prediction precision and fitting *** them,the k-Nearest Neighbors model shows the best performance on discharge power prediction with the lowest mean square error(MSE=0.00571)and the highest R-squared value(R^(2)=0.93877).The experimental results show that the relationship between the electro-acoustic signal and the gas discharge power and distance can be effectively constructed based on the machine learning algorithm,which provides a new idea and basis for the online monitoring and real-time diagnosis of plasma parameters.

关键词： discharge plasma plasma real-time diagnosis electro-acoustic signal machine learning acoustic signature

基于超级站观测的兰州大气挥发性有机污染物特征及对臭氧形成的影响

在线全文

学校读者我要写书评

暂无评论

环境化学 2024年第3期43卷 1025-1034页

作者：常毅刘文君周惜荫甘肃省环境监测中心站兰州730000 中国科学院西北生态环境资源研究院/中国科学院寒旱区陆面过程与气候变化重点实验室兰州730000 中国科学院大学北京100049

近年来随着兰州市经济社会的不断发展,臭氧(O_(3))和挥发性有机物(VOCs)污染现象日益严重,成为制约兰州市空气污染治理的重要瓶颈.为合理有效地治理兰州市O_(3)和VOCs污染,兰州大气组分超级监测站构建全方位立体管控体系,观测与分析202... 详细信息

近年来随着兰州市经济社会的不断发展,臭氧(O_(3))和挥发性有机物(VOCs)污染现象日益严重,成为制约兰州市空气污染治理的重要瓶颈.为合理有效地治理兰州市O_(3)和VOCs污染,兰州大气组分超级监测站构建全方位立体管控体系,观测与分析2021年兰州市O_(3)及其前体物VOCs的浓度分布特征,并利用正交矩阵因子分析(PMF)模型和臭氧生成潜势(OFP)分别分析了VOCs的来源及对臭氧生成的贡献.兰州市O_(3)浓度夏季最高,春季和秋季稍低,冬季最低,夏季光化学污染高发是导致O_(3)含量较高的主要原因.VOCs污染集中在秋冬季,可能原因为冬季光化学反应减少、积累效应增加和燃煤排放增多使得VOCs含量高.大气VOCs组成较为稳定,主要为含氧VOCs(OVOCs,35.7%)和烷烃(30.8%).利用PMF源解析模型确定了当地VOCs的主要贡献源为机动车排放源(27.1%)、化石燃料燃烧源(23.8%)、化工工艺源(17.9%)、汽油挥发源(16.0%)、溶剂使用源(10.7%).通过对比VOCs的OFP,发现乙烯、丙烯、甲苯对臭氧生成潜势贡献较大,在臭氧污染治理中应重点关注.

关键词：臭氧挥发性有机物臭氧生成潜势源解析

低温下C4F7N/CO_(2)混合气体的绝缘特性与参数配置

在线全文

学校读者我要写书评

暂无评论

高电压技术 2024年第2期50卷 832-841页

作者：陶子林郑宇高克利朱太云刘伟周文俊武汉大学电气与自动化学院武汉430072 国网安徽省电力有限公司电力科学研究院合肥230000 中国电力科学研究院有限公司北京100192

为提出低温下满足液化温度和绝缘要求的C4F7N/CO_(2)混合气体的参数配置,研究了C4F7N/CO_(2)混合气体在低温下的绝缘特性。首先采用实验和计算得到了不同气压和混合体积比例下C4F7N/CO_(2)混合气体的液化温度,结果表明计算得到的液化温... 详细信息

为提出低温下满足液化温度和绝缘要求的C4F7N/CO_(2)混合气体的参数配置,研究了C4F7N/CO_(2)混合气体在低温下的绝缘特性。首先采用实验和计算得到了不同气压和混合体积比例下C4F7N/CO_(2)混合气体的液化温度,结果表明计算得到的液化温度与实验数据较为相符。其次开展不同温度下C4F7N/CO_(2)混合气体的工频击穿试验,获得了C4F7N/CO_(2)混合气体的击穿电压随温度的变化。结果表明:气体在液化阶段的击穿电压标准差为液化后的2~7倍,且液化后混合气体的绝缘性能出现显著下降。此时击穿电压只与温度有关,基本不受混合体积比例的影响。考虑混合气体设备的应用需求,分别以–25℃和–30℃为最低使用温度,提出了满足要求的C4F7N/CO_(2)混合气体参数配置方案,可为低温下C4F7N/CO_(2)混合气体的应用提供参考。

关键词： C4F7N/CO_(2)混合气体绝缘特性约化电场液化温度参数配置

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

排渗失效下尾矿库溃坝三维模型试验研究

水利学报 2024年第6期55卷 735-743页

作者：张力霆马文君刘雅帆张少雄周玎李鑫石家庄铁道大学河北石家庄050043 河北省应急管理科学研究院河北石家庄050000 石家庄职业技术学院河北石家庄050000 铜源国际工程设计研究有限公司河北秦皇岛066000

针对尾矿库渗透破坏模式,为克服二维试验槽边壁效应对模型渗流走向及溃决位置的影响,本文以某尾矿库为原型,基于自主设计的三维尾矿库溃坝模型试验平台,进行了排渗设施失效诱发的尾矿库溃坝模型试验研究,揭示了该尾矿库的溃决模式及溃... 详细信息

针对尾矿库渗透破坏模式,为克服二维试验槽边壁效应对模型渗流走向及溃决位置的影响,本文以某尾矿库为原型,基于自主设计的三维尾矿库溃坝模型试验平台,进行了排渗设施失效诱发的尾矿库溃坝模型试验研究,揭示了该尾矿库的溃决模式及溃决机理。结果表明:(1)排渗失效导致的溃坝呈现局部流土破坏-坝体累计变形-深层滑动面发展贯通-整体突发失稳的渐进伴突发型溃决演化模式;(2)坝体孔隙水压力骤变是坝体发生滑动破坏的关键响应指标,预示着坝体将在短时间内由滑动体前后缘局部散浸软化、流土、塌陷转变为大范围溃决,可作为坝体溃决事故的前兆信息;(3)排渗失效导致的尾矿库溃坝过程具有渐进性和突发性的特点,发生散浸与流土破坏的过程时间较长,发生深层滑动和溃决的时间短暂,该特征可为尾矿库渗透破坏隐患治理及坝体溃决应急响应提供参考。研究结果对尾矿库溃坝的灾害预防具有重要的现实意义。

关键词：尾矿库模型试验孔隙水压力流土破坏坝体溃决

维普期刊数据库博看期刊