检索结果-南通市图书馆

材料科学与工程（中英文B版） 2012年第1期2卷 81-89页

作者： jiri minster Michal Micka Institute of Theoretical and Applied Mechanics of the Academy of Sciences of the Czech Republic Prague Czech Republic Faculty of Transportation Sciences Czech Technical University Prague 11000 Czech Republic

The aim of the paper is to find a practical numerical approach to define the time-dependent mechanical characteristics of a rheonomic material from microindentation data. The ANSYS FEM program for viscoelastic bodies is used for numerical simulations of the indentation process. All three parts of the indentation process (loading), dwell time with indentation creep and unloading, are well modelled and the histories of the relaxation modulus, the bulk or shear moduli are defined in the form of Prony series. The results obtained by numerical simulation are compared with satisfactory accuracy to the values from an analytical approach based on the linear theory of viscoelasticity and to results of standard macro tests of the material, which had been previously measured by the authors.

关键词：数值模拟形式定义标准材料压痕弹性特性时间变化 ANSYS有限元程序时间依赖性

Applicability limits of the DAX test in plastic bonded explosives

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

Defence Technology（防务技术） 2024年第6期36卷 64-70页

作者： Martin Künzel Jindrich Kucera jiri Pachman OZM Research Bliznovice 32Hrochuv Tynec 53862Czech Republic Institute of Energetic Materials Faculty of Chemical TechnologyUniversity of PardubiceStudentska 95Pardubice 53210Czech Republic

The Disc Acceleration e Xperiment(DAX)is one of the most recent experimental methods of performance characterization of new energetic materials.A cylindrical explosive charge accelerates a thin metallic disc and its velocity is measured continuously using photonic Doppler *** detonation velocity is measured *** DAX test can be used to obtain the Chapman-Jouguet(CJ)detonation pressure and to describe detonation products expansion using reduced amount of explosive.A series of DAX tests was performed at various charge diameters and disc thicknesses with Semtex 1 A plastic bonded explosive and sensitized *** DAX-like evaluation was also applied to previously measured data of Semtex 1A and A-IX-1 *** optimum disc thickness is determined by the disc to explosive mass ratio of *** repeatability of the Semtex 1 A detonation pressure results is about four times lower compared to the pressed and liquid explosives.

关键词： Flyer plate Detonation pressure Photonic Doppler velocimetry Semtex

Study of relationship between motion of mechanisms in gas operated weapon and its shock absorber

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 42-54页

作者： jiri Balla Roman Vitek Dung Nguyen Van Zbynek Krist Hung Nguyen Van Department of Weapons and Ammunition University of Defence BrnoCzech Republic Department of Weapons Le Quy Don Technical UniversityHanoiViet Nam Department of Design and Special Engineering Alexander Dubcek University of TrencinSlovakia

The article deals with the motion of the breech block carrier and the weapon casing of an automatic weapon mounted on a flexible carriage and the base of the *** works,which did not consider the dynamic properties of the base of the weapon,did not allow to reconcile the calculated and experimental results of the weapon casing displacement when shooting from firing *** the analysis of the motion of individual parts,the methods of mathematical modelling and firing experiments using a high-speed camera were *** show the best accord with experiment when modelling the system with 4 degrees of *** oscillation of the system regarding the movement of the breech block carrier and the weapon casing was investigated under changed conditions of rate of fire,the use of a muzzle brake and different types of shock *** velocities and displacements of the weapon casing and the breech block carrier at different values of the impulse of the gases to the breech block carrier were determined.

关键词： Shock absorber Gas-operated weapon Force-impulse diagram Recoil system Breech block carrier

Velocity equation for grenades while impacting on dry sand media

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5期35卷 168-173页

作者： Martin Macko Xuan Son Bui Kongsathit Phanthavong Duc Hung Pham Van Gion Do Van Minh Do jiri Skala University of Defence BrnoCzech Republic Le Quy Don Technical University Ha NoiViet Nam

This paper deals with the collision of sphere shape grenades with sand *** central issue of the article is the establishing of an empirical velocity equation of the grenade while impacting on sand that is used to solve motion equations of the mechanical mechanism inside the impact grenade *** paper focuses on impact velocities that are lower than 5 m s^(-1).An experiment was conducted to study the velocity of the grenade while impacting on dry sand.A high-speed camera video was used to capture the grenade *** grenade velocity in the impact process was generated from these video *** types of fitting curves are used to regress the velocity equation of the grenade while interacting with the sand media and the best-fitting model is *** result shows the regression curve has a high correlation with the experiment data for grenade velocities below 5 m s^(-1).The received regression equation is useful for analyzing the working ability of the inertial mechanism inside the impact grenade or analyzing and choosing the appropriate parameters of each part in the inertial mechanism to meet the required characteristics of the mechanism.

关键词： Dynamic response Impact velocity Impact grenade Low-velocity impact

纤维弯曲对其集合体过滤特性影响的稳态数值分析

在线全文

学校读者我要写书评

暂无评论

纺织学报 2024年第7期45卷 31-39页

作者：刘倩倩尤健明王琰孙成磊 jiri Militky DANA Kremenakova JAKUB Wiener 祝国成浙江理工大学纺织科学与工程学院(国际丝绸学院) 浙江杭州310018 浙江朝晖过滤技术股份有限公司浙江嘉兴314511 浙江理工大学浙江-捷克先进纤维材料联合实验室浙江杭州310018 利贝雷茨理工大学纺织工程学院捷克利贝雷茨46117 浙江省现代纺织技术创新中心(鉴湖实验室) 浙江绍兴312000

为探究纤维过滤介质中纤维曲率对其内部速度分布、压力损失、过滤效率的影响,通过Digimat建模软件建立曲率K分别为0、2、4、6,固体体积分数为8%,在三维空间中随机分散排列的纤维过滤介质模型,结合计算流体力学方法,基于拉格朗日离散模型... 详细信息

为探究纤维过滤介质中纤维曲率对其内部速度分布、压力损失、过滤效率的影响,通过Digimat建模软件建立曲率K分别为0、2、4、6,固体体积分数为8%,在三维空间中随机分散排列的纤维过滤介质模型,结合计算流体力学方法,基于拉格朗日离散模型和Laminar流场,利用雷诺相似准则,设置入口速度分别为0.05、0.142、0.5、1、2 m/s,平均颗粒粒径为0.25、0.5、1、1.5、2.5、4、5 mm,对微米纤维模型内部气-固两相流动情况进行数值模拟。结果表明:随着纤维曲率K由0增大至6,在入口速度为0.5 m/s时,纤维曲率对速度场分布的影响不明显,速度场的分布呈无规律性;纤维曲率对模型内部压力损失有显著影响,随着纤维曲率的提高,纤维模型内部压力损失呈线性增大;纤维过滤介质的过滤效率随纤维模型曲率的增大而提高,在入口速度为1 m/s、模型曲率K为6时,对平均粒径为5 mm的颗粒过滤效率接近90%,明显高于相同粒径下K为0时的过滤效率。

关键词：计算流体力学纤维曲率压力损失数值模拟过滤效率

在线全文

学校读者我要写书评

暂无评论

结构参数对水力旋流器壁面磨损的影响研究

煤炭工程 2024年第1期56卷 191-198页

作者：吉日格勒国家能源集团准能集团有限责任公司内蒙古鄂尔多斯017000

水力旋流器壁面磨损影响水力旋流器的使用寿命和分级效率,为了解决水力旋流器壁面严重磨损的问题,利用Fluent软件,首先分析了其内部流场和固体颗粒的运动特性,并探究了水力旋流器的结构参数进口形式和底流口直径对其壁面磨损的影响规律... 详细信息

水力旋流器壁面磨损影响水力旋流器的使用寿命和分级效率,为了解决水力旋流器壁面严重磨损的问题,利用Fluent软件,首先分析了其内部流场和固体颗粒的运动特性,并探究了水力旋流器的结构参数进口形式和底流口直径对其壁面磨损的影响规律。搭建了一套水力旋流器壁面磨损试验装置进行磨损试验,与数值模拟的结果进行比较,验证了仿真模型的准确性和可靠性,为水力旋流器结构优化、防磨措施的提出提供了依据。

关键词：水力旋流器冲刷磨损 Fluent数值模拟结构参数

TMB相关免疫浸润调控评分(MOTIF)预测免疫治疗响应并指导联合增效

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2024年第6期69卷 803-822页

作者：钱政宇潘艺芊李薛鑫陈衍行吴灏祥刘泽先 Martin Kosar jiri Bartek 王梓贤徐瑞华 Department of Medical Oncology Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangdong Provincial Clinical Research Center for CancerResearch Unit of Precision Diagnosis and Treatment for Gastrointestinal CancerChinese Academy of Medical SciencesGuangzhou 510060China Science for Life Laboratory Division of Genome BiologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm S-17121Sweden Department of General Surgery The Fourth Affiliated HospitalChina Medical UniversityShenyang 110032China Bioinformatics Platform Sun Yat-sen University Cancer CenterGuangzhou 510060China Zhejiang University-University of Edinburgh Institute Zhejiang University School of MedicineHaining 314400China Edinburgh Medical School Biomedical SciencesCollege of Medicine and Veterinary MedicineThe University of EdinburghEdinburgh EH11LTUK Danish Cancer Society Research Center Copenhagen DK-2100Denmark Laboratory of Artificial Intelligence and Data Science Sun Yat-sen University Cancer CenterGuangzhou 510060China

Patients with high tumor mutational burden(TMB)levels do not consistently respond to immune checkpoint inhibitors(ICIs),possibly because a high TMB level does not necessarily result in adequate infiltration of CD8^(+)T *** bulk ribonucleic acid sequencing(RNA-seq)data from 9311 tumor samples across 30 cancer types,we developed a novel tool called the modulator of TMB-associated immune infiltration(MOTIF),which comprises genes that can determine the extent of CD8^(+)T cell infiltration prompted by a certain TMB *** confirmed that MOTIF can accurately reflect the integrity and defects of the cancer-immunity *** analyzing 84 human single-cell RNA-seq datasets from 32 types of solid tumors,we revealed that MOTIF can provide insights into the diverse roles of various cell types in the modulation of CD8^(+)T cell *** pretreatment RNA-seq data from 13 ICI-treated cohorts,we validated the use of MOTIF in predicting CD8^(+)T cell infiltration and ICI *** the components of MOTIF,we identified EMC3 as a negative regulator of CD8^(+)T cell infiltration,which was validated via in vivo ***,MOTIF provided guidance for the potential combinations of programmed death 1 blockade with certain immunostimulatory drugs to facilitate CD8^(+)T cell infiltration and improve ICI efficacy.

关键词： Tumor mutational burden Immunotherapy Cancer-immunity cycle Treatment efficacy prediction CD8^(+)T cell infiltration Combination therapy

在线全文

学校读者我要写书评

暂无评论

高亲水性壳聚糖纳米纤维膜的制备及性能

现代纺织技术 2024年

作者：戈亚锋王琰徐楚琪 jiri Militky DANA Kremenakova 祝国成现代纺织技术创新中心(鉴湖实验室) 浙江理工大学浙江-捷克先进纤维材料联合实验室利贝雷茨理工大学纺织工程学院浙江理工大学纺织科学与工程学院(国际丝绸学院)

为满足医用创伤敷料对高亲水性和抑菌性的要求，以壳聚糖(CS)、聚乙烯醇(PVA)、甘油(GL)为原料，通过静电纺丝技术制备了PVA/CS/GL纳米纤维膜。对纳米纤维膜的形貌和结构进行表征，分析其热稳定性、亲水性、溶胀度和力学性能，并探究其... 详细信息

为满足医用创伤敷料对高亲水性和抑菌性的要求，以壳聚糖(CS)、聚乙烯醇(PVA)、甘油(GL)为原料，通过静电纺丝技术制备了PVA/CS/GL纳米纤维膜。对纳米纤维膜的形貌和结构进行表征，分析其热稳定性、亲水性、溶胀度和力学性能，并探究其抗菌性能。结果表明：当甘油质量分数为3%时，PVA/CS/GL纳米纤维膜综合性能最佳，具有较好的网状结构和均匀的纤维直径，其中甘油的添加改善了壳聚糖基纳米纤维膜亲水性差、力学强度低等不足。当加入质量分数为3%的甘油后，纳米纤维膜的接触角从53.3°降低至25.3°，在PBS缓冲液中的平衡溶胀率从239.5%提高到332.1%，拉伸强度和断裂伸长率分别从2.68MPa、8.2%提升到5.83MPa、17.9%。抗菌实验表明，PVA/CS/GL纳米纤维膜对大肠杆菌和金黄色葡萄球菌的抑菌率分别为94.39%、89.65%，表现出良好的抑菌效果。因此，该PVA/CS/GL纳米纤维膜在医用创伤敷料方面具有潜在应用价值。

关键词：壳聚糖聚乙烯醇甘油纳米纤维膜亲水性溶胀性

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

耐水性CA PVA纳米纤维膜的制备与性能

现代纺织技术 2024年第2期32卷 96-104页

作者：张佳鹏王琰姚菊明 jiri Militky DANA Kremenakova 祝国成浙江理工大学纺织科学与工程学院(国际丝绸学院) 浙江理工大学浙江-捷克先进纤维材料联合实验室浙江理工大学材料科学与工程学院杭州310018 宁波大学材料科学与化学工程学院宁波315201 现代纺织技术创新中心(鉴湖实验室) 浙江绍兴312000 利贝雷茨理工大学纺织工程学院捷克利贝雷茨46117

为制备可降解、高比表面积、吸附效率高的吸附膜材料,采用静电纺丝技术制备一种醋酸纤维素(CA)聚乙烯醇(PVA)复合纳米纤维膜。用可降解的CA为原料制备CA纳米纤维膜;为提高CA纳米纤维膜的力学性能,与PVA共混纺丝,制备了CA PVA复合纳米纤... 详细信息

为制备可降解、高比表面积、吸附效率高的吸附膜材料,采用静电纺丝技术制备一种醋酸纤维素(CA)聚乙烯醇(PVA)复合纳米纤维膜。用可降解的CA为原料制备CA纳米纤维膜;为提高CA纳米纤维膜的力学性能,与PVA共混纺丝,制备了CA PVA复合纳米纤维膜;为改善膜的耐水性能,采用戊二醛(GA)蒸汽交联法对CA PVA纳米纤维膜进行交联改性处理,而后对CA PVA纳米纤维膜的表观形貌、耐水性能,力学性能以及吸附性能进行了评价分析。研究发现:CA与PVA共混后仍具有良好的可纺性;CA PVA纳米纤维膜的表面经GA交联后逐渐致密化;改性后的CA PVA纳米纤维膜在水中24 h后质量损失率由改性前的70.76%下降到7.28%;耐水性能随温度和pH值的增加而降低,在25~35℃、pH值为5的条件下,膜的质量损失率最低,为5%左右;断裂强度由0.76 MPa提高到1.51 MPa,断裂伸长率由6.31%提高到8.03%;对Cu 2+的吸附在2 h后达到平衡,最大吸附量达到89.52 mg g,说明改性后的CA PVA纳米纤维膜具有良好的耐水性能及力学性能,对重金属离子的吸附具有良好效果,为重金属废水的处理提供了一种有效方法。

关键词：醋酸纤维素纳米纤维膜戊二醛交联缩醛反应离子吸附

呵护成长一路“童”行卑尔根Haukeland妇幼医院

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

室内设计与装修 2024年第7期 76-81页

作者：无 jiri havran(摄影) 西竹(编译) KHR Architecture PKA Arkitekter Henning Larsen Architects 不详

新落成的卑尔根Haukeland大学附属医院的玻璃大楼(Glasblokkene)体现了一个宏大愿景,即建立一个全面的儿科和妇女医院。该设施旨在将所有与儿童、青少年和妇女相关的专业技术都汇集于此。建筑设计强调信任、质量和开放性;而医院的目标... 详细信息

新落成的卑尔根Haukeland大学附属医院的玻璃大楼(Glasblokkene)体现了一个宏大愿景,即建立一个全面的儿科和妇女医院。该设施旨在将所有与儿童、青少年和妇女相关的专业技术都汇集于此。建筑设计强调信任、质量和开放性;而医院的目标是为病人提供最佳的治疗环境,打造一个以儿童为中心、室内与室外具有连通性以及感官丰富的空间。设计还着重考虑为医护人员和亲属创造最佳条件,因为在病人的护理中,他们将发挥关键作用。

关键词：妇幼医院大学附属医院卑尔根建筑设计医护人员最佳条件连通性青少年