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Bulletin of the Military University of Technology最新文献

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Effects of Portland cement addition on Young’s modulus of geopolymer concrete cured at ambient conditions 硅酸盐水泥掺量对环境固化地聚合物混凝土杨氏模量的影响
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8494
Ł. Anaszewicz, R. Rekucki, A. Stolarski
{"title":"Effects of Portland cement addition on Young’s modulus of geopolymer concrete cured at ambient conditions","authors":"Ł. Anaszewicz, R. Rekucki, A. Stolarski","doi":"10.5604/01.3001.0012.8494","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8494","url":null,"abstract":"This paper presents the results of Young’s modulus and Poisson’s ratio tests conducted\u0000on samples made of low-calcium fly ash-based geopolymer concrete samples and on samples with\u0000a 10% addition of Portland cement, cured at ambient conditions. Furthermore, the measurement\u0000system, as well as sampling and sample preparation methodology, are discussed. Strain was tested\u0000concurrently using resistive strain gauges and extensometer on cylinder-shaped samples with a diameter\u0000of 150 mm and height of 300 mm.\u0000Keywords: engineering, construction materials, geopolymer concrete, Young’s modulus, Poisson’s\u0000ratio, alkali-activated concrete\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125191536","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: 1
Security analysis of passcode mechanisms in Telegram and Viber Telegram和Viber密码机制的安全性分析
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8512
K. Kaczynski, J. Gawinecki
{"title":"Security analysis of passcode mechanisms in Telegram and Viber","authors":"K. Kaczynski, J. Gawinecki","doi":"10.5604/01.3001.0012.8512","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8512","url":null,"abstract":"Telegram and Viber are the most popular mobile messengers nowadays. Unlike other\u0000products, such as WhatsApp or Facebook Messenger, these messengers allow their users to restrict\u0000access to messages stored on the device − in Telegram it is access protection using a PIN code, in the\u0000Viber there is hidden chat functionality, also protected with a PIN code. This article presents a practical\u0000attack that allows to bypass the security functionalities implemented by the developers of both solutions.\u0000The paper presents the methods to increase the security of the mentioned software in a way that it can\u0000be implemented in the Android operating system.\u0000Keywords: Telegram, Viber, cryptography, Android, instant messenger.\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121409709","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
The effect of the aggregate type on the properties of pavement concrete 骨料类型对路面混凝土性能的影响
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8496
Grzegorz Rogojsz, Damian Skupski, Bartosz Januszewski
{"title":"The effect of the aggregate type on the properties of pavement concrete","authors":"Grzegorz Rogojsz, Damian Skupski, Bartosz Januszewski","doi":"10.5604/01.3001.0012.8496","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8496","url":null,"abstract":"This paper presents the results of laboratory tests on the properties of cement concrete\u0000containing various types of aggregate. The purpose of the tests was to determine the effect of aggregate\u0000on compressive strength, indirect tensile strength, air pore characteristics, frost resistance and\u0000the modulus of elasticity of concrete for road surfaces. The aggregate that meets the requirements for\u0000road concrete was determined on the basis of the tests.\u0000Keywords: road concrete, frost resistance of aggregate, frost resistance of road concrete.\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117322304","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: 1
Estimate of dynamic load capacity of reinforced concrete deep beam made of very high strength construction materials 高强度建筑材料制成的钢筋混凝土深梁动载能力估算
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8483
W. Cichorski
{"title":"Estimate of dynamic load capacity of reinforced concrete deep beam made of very high strength construction materials","authors":"W. Cichorski","doi":"10.5604/01.3001.0012.8483","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8483","url":null,"abstract":"The paper presents an analysis of the dynamic load capacity of a dynamically loaded rectangular reinforced-concrete deep beam made of high-strength materials, including the physical nonlinearity of the construction materials: concrete and reinforcing steel. The solution was acquired with the use of the method presented in [15]. The dynamic load capacity of the reinforced concrete beam was determined. The results of numerical solutions are presented, with particular emphasis on the impact of the very high strength of concrete and steel on the reinforced concrete beam’s dynamic load capacity. The work confirmed the correctness of the assumptions and deformation models of concrete and steel as well as the effectiveness of the methods of analysis proposed in the paper [1, 15] for the problems of numerical simulation of the behaviour of reinforced concrete deep beams under dynamic loads.\u0000Keywords: mechanics of structures, reinforced concrete structures, deep beams, dynamic load, physical nonlinearity.\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116329360","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
Identification of numerical model parameters of tunnel lining in non-cohesive soil 非粘性土中隧道衬砌数值模型参数辨识
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8484
P. Szklennik
{"title":"Identification of numerical model parameters of tunnel lining in non-cohesive soil","authors":"P. Szklennik","doi":"10.5604/01.3001.0012.8484","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8484","url":null,"abstract":"The paper discusses identification of numeric model parameters of tunnel lining in a soil\u0000medium according to the discrete element method. An author’s program based on the discrete element\u0000method was used. Laboratory tests were conducted to determine the computer model parameters\u0000defining the lining and the soil medium. The numerical model was calibrated by comparing the lining\u0000deformations occurring in the laboratory test and in the numeric simulation. Tunnel lining displacement\u0000during laboratory tests was determined using digital photography.\u0000Keywords: civil engineering, discrete element method, cylindrical tunnel lining\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114150099","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: 1
Stress wave method in dynamic resistance analysis of an explosion-proof valve 应力波法在防爆阀动态阻力分析中的应用
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8497
Bartłomiej Pieńko, Z. Szcześniak
{"title":"Stress wave method in dynamic resistance analysis of an explosion-proof valve","authors":"Bartłomiej Pieńko, Z. Szcześniak","doi":"10.5604/01.3001.0012.8497","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8497","url":null,"abstract":"The paper presents the concept of a novel stress wave method (SWM) for determining\u0000the dynamic reaction of structural elements of an explosion-proof valve. The stress wave method\u0000is an original solution to the issue of the dynamic reaction of structural elements and systems. It\u0000is particularly recommended in the case of intensive percussive or explosive impacts. The method\u0000was developed by the author of works [14, 15]. It reflects the wave nature of stress development. The\u0000paper presents the origin, assumptions and the basic dependencies of the method. The characteristics\u0000of the method are illustrated by means of solutions to issues closely related to the requirements for\u0000testing the resistance of shelter explosion-proof valves. The description also includes\u0000a comparison of the calculation results with the results obtained by the finite element method (FEM)\u0000and the results of experimental tests. The possibility of significant differences between the compared\u0000solutions has been shown. It should be noted that geometric attenuation, reflections and interference\u0000of waves are natural for the dynamic reaction of an element and therefore for wave processes. These\u0000phenomena can significantly affect the distribution of the parameters of the sought dynamic reaction\u0000in space and time. The proposed method of analysis is distinguished by high accuracy of calculations.\u0000Keywords: stress waves, structural element vibrations, discrete models, differential solution, explosion-\u0000proof valve\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114272997","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
Measurement accuracy analysis for microgeometry nanostandards with microinterferometer and stylus profilometer 用微干涉仪和触控轮廓仪测量微几何纳米标准的精度分析
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8503
Łukasz Ślusarski
{"title":"Measurement accuracy analysis for microgeometry nanostandards with microinterferometer and stylus profilometer","authors":"Łukasz Ślusarski","doi":"10.5604/01.3001.0012.8503","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8503","url":null,"abstract":"The goal of the work, described in this paper, was to examine and analyse measurement\u0000capabilities of GUM Length and Angle Department in measurements of step height/depth standards\u0000with the values below 1 μm (nanostandards), with 2D, and 3D surface characteristics. Measurements\u0000were performed with microinterforometer and stylus profilometer.\u0000Keywords: nanometrology, depth/height standards, microinterferometry, contact profilometry.\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125131378","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
Mobile facilities of military infrastructure for accommodation of soldiers 为士兵提供食宿的军事基础设施的移动设施
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8502
Tomasz Wojtkiewicz
{"title":"Mobile facilities of military infrastructure for accommodation of soldiers","authors":"Tomasz Wojtkiewicz","doi":"10.5604/01.3001.0012.8502","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8502","url":null,"abstract":"This issue is a subject of works and studies at the Civil Engineering and Geodesy Faculty\u0000of the Military University of Technology. The presented proposals of the modern facilities meeting\u0000the NATO standards are based on the technical solutions and the components manufactured in Poland.\u0000Moreover, they are fully compliant with the Unified Facilities Criteria published by the DoD USA\u0000and the International Building Code. It should be emphasized that the presented solutions of temporary\u0000mobile structures of accommodation for soldiers can be used in the near future in the Armed Forces\u0000of the Republic of Poland. The components are made in Poland and have the required certificates.\u0000Additional operating tests can be made at the Faculty of Engineering and Geodesy of the Military\u0000University of Technology. Currently, some works are being conducted concerning the preparation\u0000of documents for the Armed Forces. Field tests will determine the time needed for assembly and disassembly\u0000of variously configured objects and mobile, modular command posts.\u0000Keywords: construction, standards, exploitation, accommodation infrastructure.\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116858143","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
Analysis of temperature gradient in concrete pavement 混凝土路面温度梯度分析
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8493
Grzegorz Rogojsz
{"title":"Analysis of temperature gradient in concrete pavement","authors":"Grzegorz Rogojsz","doi":"10.5604/01.3001.0012.8493","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8493","url":null,"abstract":"The paper presents the results of experimental research that is the continuation of the research\u0000conducted as a part of a Ph.D. dissertation. The experimental research consisted in measuring\u0000the temperature at various depths inside a concrete slab, including its surface, and measuring the air\u0000temperature. The temperature distribution was measured on a concrete slab with dimensions similar\u0000to real road slab dimensions. The aim of the research was to determine the temperature gradient\u0000in the concrete slab in Polish climatic conditions and to verify the available analytical methods.\u0000Keywords: temperature gradient, concrete pavement, thermal stress in concrete pavement.\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128249192","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
Dynamic reaction of a human on vibrations by analysis of a single-dimensional biomechanical model 基于一维生物力学模型分析的人体对振动的动态反应
Bulletin of the Military University of Technology Pub Date : 2018-12-31 DOI: 10.5604/01.3001.0012.8507
G. Bąk, Elżbieta Cukierman-Rakoczy
{"title":"Dynamic reaction of a human on vibrations by analysis of a single-dimensional biomechanical model","authors":"G. Bąk, Elżbieta Cukierman-Rakoczy","doi":"10.5604/01.3001.0012.8507","DOIUrl":"https://doi.org/10.5604/01.3001.0012.8507","url":null,"abstract":"The article presents the concepts of the assessment of harmfulness of vibrations generated\u0000from various sources. Domestic and foreign standard procedures were discussed, including ISO\u0000proposals. It has been pointed out that all procedures can be considered as indirect ones, that they refer\u0000to vibrations affecting humans, and not those resulting from the dynamic response induced in individual\u0000human organs. The same applies to the criteria for determining the loss of life in communication\u0000collisions. It was pointed out that in the literature we find attempts of a direct approach, the essence\u0000of which is to study the dynamic reaction of individual human organs inscribed in the one or twodimensional\u0000model. The results of own tests of a person subjected to intensive oscillatory procedures\u0000were presented in order to identify the stiffness model proposed to assess the harmfulness of industrial\u0000type vibrations. It has been shown that two-dimensional models can be suitable here.\u0000Keywords: harmful effect of vibrations, human biomechanical models, one-dimensional model C.M.\u0000Harris, model identification, differential solution.\u0000\u0000","PeriodicalId":232579,"journal":{"name":"Bulletin of the Military University of Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114498123","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: 1
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