Bulletin of the Military University of Technology最新文献_第6页

Numerical prediction of dynamic stability loss of a flexible cylindrical shell in a granular medium 弹性圆柱壳在颗粒介质中动态稳定性损失的数值预测

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5563

P. Szklennik, G. Bąk

引用次数: 0

Tribological properties of grease containing graphene oxide or hexagonal boron nitride 含氧化石墨烯或六方氮化硼润滑脂的摩擦学性能

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5556

I. Dąbrowski, K. Gocman, T. Kałdoński

{"title":"Tribological properties of grease containing graphene oxide or hexagonal boron nitride","authors":"I. Dąbrowski, K. Gocman, T. Kałdoński","doi":"10.5604/01.3001.0013.5556","DOIUrl":"https://doi.org/10.5604/01.3001.0013.5556","url":null,"abstract":"The purpose of this paper is to present the results of research of tribological behavior of basic greases (of 2. NLGI class) including different mass concentration concentration (0.05%, 0.1%, 0.2%, 0.5%, 1%, 2%) of additives: graphene oxide (produced by the Institute of Electronic Materials Technology, Warsaw) and hexagonal boron nitride (produced by the Military University of Technology, Warsaw). In the first part of this publication there is elementary information about graphene and its applications, especially in tribological field. The next part of the paper contains the results of research on the mentioned above samples, which were investigated with four-ball apparatus T-02 and Universal Micro/Nano Tester UNMT (CETR, CA, USA), at the Department of Tribology and Service Fluids Logistics at the Faculty of Mechanical Engineering, Military University of Technology. The results proved a positive effect of adding graphene oxide or hexagonal boron nitride to basic grease on its tribological properties. In case of “water dispersion of graphene oxide”, its tribological properties were similar to the samples including significant concentration of GO.\u0000Keywords: graphene, grease, graphene oxide, hexagonal boron nitride\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121232948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chemical weapon in the 20th and 21st centuries. Part 2. Nerve agents ‒ G group 20世纪和21世纪的化学武器。第2部分。神经毒剂，G组

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5560

M. Kloske, Z. Witkiewicz

引用次数: 0

Chemical weapon in the 20th and 21st centuries. Part 1. Chemical warfare agents before G nerve agent group discovery 20世纪和21世纪的化学武器。第1部分。化学战剂前G组神经毒剂的发现

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5557

M. Kloske, Z. Witkiewicz

引用次数: 1

Experimental investigations on electrorheological properties of lubricating oils containing ionic liquid.Part. 1. Investigations with modified Brookfield DV-III Ultra Viscosimeter 含离子液体润滑油电流变特性的实验研究。1。改良布鲁克菲尔德DV-III型超粘度计的研究

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5554

J. Juda, T. Kałdoński, T. Kałdoński

{"title":"Experimental investigations on electrorheological properties of lubricating oils containing ionic liquid.\u0000Part. 1. Investigations with modified Brookfield DV-III Ultra Viscosimeter","authors":"J. Juda, T. Kałdoński, T. Kałdoński","doi":"10.5604/01.3001.0013.5554","DOIUrl":"https://doi.org/10.5604/01.3001.0013.5554","url":null,"abstract":"The results of experimental investigations on electrorheological (ER) properties of lubricating oils which contain ionic liquids, are presented in this article. The investigations were carried out on the special stand which was projected for this aim. On this stand there was used the modified Brookfield viscosimeter. Electrorheological properties of two mixtures were tested, i.e., silicone damping liquid GP-1 which is polimethylsiloksane mixture containing 2% (v/v) of ionic liquid CJ 001, i.e., tetrafluoroboran 1-methyl-3-octyloxymethylimidazolium as well as base polialfaolefine oil PAO-6 which contains 2% (v/v) of ionic liquid CJ 008, i.e., trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide. Selection of components of both mixtures was based on the results of investigations of miscible and on evaluation of basic phys-chem properties. The investigations showed that the made mixtures have generated the ER effect, but it was short-lived effect, suggesting the changes of inner structure of these mixtures. Therefore, we have planned the next investigations, among others dielectric spectroscopy and microscope observations in situ of these mixtures in external electric fields. The aim of those investigations will be to record the fading ER effect and to understand this mechanism.\u0000Keywords: electrorheological effect, homogenous mixtures, lubricants, ionic liquids\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115873679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Functional and diagnostic model of a hybrid power system using renewable energy sources 利用可再生能源的混合电力系统的功能与诊断模型

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5561

R. Duer, Pawel Wrzesien, S. Duer

引用次数: 0

A method for the approximate determination of microparticle amount and mass in biological mixtures using a fractionation process in a centrifugal force field 一种在离心力场中使用分馏过程近似测定生物混合物中微粒数量和质量的方法

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5552

A. Górka

{"title":"A method for the approximate determination of microparticle amount and mass in biological mixtures using a fractionation process in a centrifugal force field","authors":"A. Górka","doi":"10.5604/01.3001.0013.5552","DOIUrl":"https://doi.org/10.5604/01.3001.0013.5552","url":null,"abstract":"The paper presents a simplified method of estimating the amount and specific mass of microparticles in complex biological mixtures using the fractionation process in the field of centrifugal forces. In the presented method, using the heaviest blood cells – erythrocytes – as an example, a geometric model of a binary fraction in a borderline equilibrium state formed in the process of blood fractionation was used. In this model, an approximated shape of the erythrocyte and a sample normal distribution of the size and number of microparticles in the examined model fraction filled with erythrocytes were used. Based on publicly available blood data, it has been shown that it is possible to estimate the amount and specific weight of microparticles. The accuracy of such estimation generally depends on the precision of representation of shapes, the degree of filling the fraction with microparticles and on the individual quantitative and dimensional distribution of these particles in the examined fraction. The above conclusions, which determine the accuracy of the method presented, were verified in the paper with the use of rheological blood data, commonly available in literature for various types of measuring containers, which affect the level of filling of a given fraction with microparticles.\u0000Keywords: fractionation of biological mixtures, fractionation of blood components, erythrocyte model, erythrocyte shape, blood components\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131027410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sand-lime bricks with addition of basalt powder 添加玄武岩粉的砂石灰砖

Bulletin of the Military University of Technology Pub Date : 2019-09-30 DOI: 10.5604/01.3001.0013.5562

P. Kostrzewa

{"title":"Sand-lime bricks with addition of basalt powder","authors":"P. Kostrzewa","doi":"10.5604/01.3001.0013.5562","DOIUrl":"https://doi.org/10.5604/01.3001.0013.5562","url":null,"abstract":"The purpose of the work is to modify traditional lime-sand products with the addition of basalt dust. It is to improve the physical and mechanical parameters of the material. Thanks to this, bricks will have a better price / quality ratio and will be a more interesting solution for potential customers. To the silicate mass of raw material, after the process of extinguishing the lime in the mass, a modifier in the form of basalt dust was added, and then bricks were formed and autoclaved. The effect of the applied additive on the quality of products, made of the prepared mass, was evaluated on the basis of a comparative analysis of traditional lime-sand products and products modified with the addition of basalt dust. The tests were carried out in accordance with the methodology included in the standards. Replacing the part of traditional silicate mass with basalt dust at the production stage had a positive effect on the processes occurring during the autoclaving of the discussed products. The additive under hydrothermal conditions reacted with lime and silica to form additional amounts of the C-S-H phase. The use of basalt dust, in the amount of 5-20% in relation to the mass of raw materials, gave an improvement in compressive strength by up to 100% compared to samples without a modifier.\u0000Keywords: silicates, ecology, basalt powder, environment, sand-lime products, microstructure\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134421906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Analysis of occurrence of guided disorders in selected railway equipment — impact of load on measurement results 选定铁路设备导向障碍的发生分析——负荷对测量结果的影响

Bulletin of the Military University of Technology Pub Date : 2019-06-28 DOI: 10.5604/01.3001.0013.3010

K. Białek, J. Paś

引用次数: 0

Reliability-operational analysis of fixed gas fire extinguishing equipment integrated with fire signalling systems 与火灾信号系统集成的固定气体灭火设备的可靠性-运行分析

Bulletin of the Military University of Technology Pub Date : 2019-06-28 DOI: 10.5604/01.3001.0013.3011

T. Klimczak, J. Paś

引用次数: 1