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Existence of a solution for a general order boundary value problem using the Leray-Schauder fixed point theorem 利用Leray-Schauder不动点定理证明了一类一般阶边值问题解的存在性
Pub Date : 2021-01-01 DOI: 10.5937/VOJTEHG69-29703
N. Fabiano, Vahid Parvaneh
Introduction/purpose: This paper illustrates the existence of a generic Green’s function for a boundary value problem of arbitrary order that appears in many phenomena of heat convection, e.g. in the atmosphere, in the oceans, and on the Sun’s surface. Methods: A fixed point theorem in the Leray–Schauder form has been used to establish the existence of a fixed point in the problem. Results: The existence of a solution has been shown for an arbitrary order of the problem. Some practical examples are proposed. Conclusions: The boundary problem has a solution for an arbitrary order n.
简介/目的:本文说明了任意阶边值问题的一般格林函数的存在性,这种边值问题出现在许多热对流现象中,例如在大气、海洋和太阳表面。方法:利用Leray-Schauder形式的不动点定理来证明问题中不动点的存在性。结果:对于任意阶的问题都证明了解的存在性。提出了一些实际的例子。结论:边界问题具有任意阶n的解。
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引用次数: 0
Revisiting and revamping some novel results in F-metric spaces 对f -度量空间中一些新结果的重访与修正
Pub Date : 2021-01-01 DOI: 10.5937/VOJTEHG69-29615
Z. Mitrović, Mudasir Jounis, M. Rajović
Introduction/purpose: This article establishes several new contractive conditions in the context of so-called F-metric spaces. The main purpose was to generalize, extend, improve, complement, unify and enrich the already published results in the existing literature. We used only the property (F1) of Wardowski as well as one well-known lemma for the proof that Picard sequence is an F-Cauchy in the framework of F-metric space. Methods: Fixed point metric theory methods were used. Results: New results are enunciated concerning the F-contraction of two mappings S and T in the context of F-complete F-metric spaces. Conclusions: The obtained results represent sharp and significant improvements of some recently published ones. At the end of the paper, an example is given, claiming that the results presented in this paper are proper generalizations of recent developments.
前言/目的:本文在所谓的f -度量空间中建立了几个新的压缩条件。主要目的是对现有文献中已发表的成果进行概括、扩展、完善、补充、统一和丰富。我们只用了Wardowski的性质(F1)和一个著名的引理证明了在f -度量空间框架中Picard序列是一个F-Cauchy。方法:采用不动点度量理论方法。结果:在f -完备的f度量空间中,给出了两个映射S和T的f -收缩的新结果。结论:所得结果与最近发表的一些结果相比有了明显的改进。在文章的最后,给出了一个例子,声称本文所提出的结果是对最近发展的适当概括。
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引用次数: 1
Java GUI application for comparing the levels of biometric security: Fingerprint vs. Iris 用于比较生物识别安全级别的Java GUI应用程序:指纹与虹膜
Pub Date : 2021-01-01 DOI: 10.5937/vojtehg69-32007
Komlen Lalović, M. Bogdanoski
Introduction/purpose: The main purpose of this paper is to present a novel Java GUI - based software application for a comparative analysis of fingerprint and iris biometrics. Methods: The first part of this work is realized in Java Programming language. in the GUI framework named swing while the rest of the paper shows in detail the advantages and disadvantages of both systems and gives scientific data on when fingerprint and iris recognition can be used to enable top level security. The main method here is a well known comparative analysis. Results: The results were obtained for both fingerprint and iris biometrics, showing the difference between the two. Conclusion: Different types of biometrics, based on body parts formed at different age, are given as well as the comparison of their security levels.
介绍/目的:本文的主要目的是提出一种新的基于Java GUI的软件应用程序,用于指纹和虹膜生物识别的比较分析。方法:本工作的第一部分采用Java编程语言实现。本文的其余部分详细展示了两种系统的优缺点,并给出了何时可以使用指纹和虹膜识别来实现顶级安全的科学数据。这里的主要方法是众所周知的比较分析。结果:指纹识别和虹膜识别均得到了结果,显示了两者的差异。结论:根据不同年龄形成的身体部位,给出了不同类型的生物特征,并对其安全程度进行了比较。
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引用次数: 1
Pulverized river shellfish shells as a 904 cheap adsorbent for removing of malathion from water: Examination of the isotherms, kinetics, thermodynamics and optimization of the experimental conditions by the response surface method 河贝粉作为水中马拉硫磷的904廉价吸附剂:响应面法的等温线、动力学、热力学考察及实验条件优化
Pub Date : 2021-01-01 DOI: 10.5937/vojtehg69-32844
Z. Veličković, Bogdan Vujičić, Vladica S. Stojanović, Predrag Stojisavljević, Z. Bajić, V. Đokić, Negovan Ivanković, P. Otrísal
Introduction/purpose: In this study, we investigated the possibility of removing the organophosphorus pesticide malathion from water using a new adsorbent based on the biowaste of river shell shards from the Anodonta Sinadonta woodiane family, a material that accumulates in large quantities as waste on the banks of large rivers. Two adsorbents were tested - mechanically comminuted river shells (MRM) and mechanosynthetic hydroxyapatite from comminuted river shells (RMHAp). Methods: The obtained adsorbents were characterized and tested for the removal of the organophosphorus pesticide malathion from water. In order to predict the optimal adsorption conditions using the Response Surface Method (RSM), the authors investigated the influence of variable factors (adsorption conditions), pH values, adsorbent doses, contact times, and temperatures on the adsorbent capacity. Results: The best adsorption of malathion was achieved at mean pH values between 6.0 and 7.0. The adsorption data for malathion at 25, 35, and 45 °C were compared using the Langmuir, Freundlich, DubininRadushkevich (DR), and Temkin isothermal models, as well as pseudofirst order, pseudo-second order and Elovic kinetic models for modeling adsorption kinetics. The maximum Langmuir adsorption capacity for MRM and RMHAp at 25 °C was 46,462 mg g-1 and 78,311 mg g-1 , respectively. Conclusion: The results have showed that malathion adsorption on both adsorbents follows the pseudo-second kinetic model and the Freundlich isothermal model. The thermodynamic parameters indicate the endothermic, feasible, and spontaneous nature of the adsorption process.
简介/目的:本研究研究了一种新型吸附剂去除水中有机磷农药马拉硫磷的可能性,该吸附剂是基于Anodonta Sinadonta woodiane家族的河贝壳碎片生物废弃物,这是一种大量积累在大河岸边的废物。试验了两种吸附剂——机械粉碎河壳(MRM)和机械合成河壳羟基磷灰石(RMHAp)。方法:对制备的吸附剂进行表征,并对其对水中有机磷农药马拉硫磷的去除效果进行了测试。为了利用响应面法(RSM)预测最佳吸附条件,研究了吸附条件、pH值、吸附剂剂量、接触时间和温度对吸附剂容量的影响。结果:平均pH值为6.0 ~ 7.0时,对马拉硫磷的吸附效果最佳。采用Langmuir、Freundlich、DubininRadushkevich (DR)和Temkin等温模型以及拟一级、拟二级和Elovic动力学模型对马拉硫磷在25、35和45℃下的吸附数据进行了比较。25℃条件下,MRM和RMHAp的最大Langmuir吸附量分别为46,462 mg g-1和78,311 mg g-1。结论:两种吸附剂对马拉硫磷的吸附均符合拟秒动力学模型和Freundlich等温模型。热力学参数表明吸附过程是吸热的、可行的和自发的。
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引用次数: 1
Prospects for using remote sensing data in the armed forces, other troops and military formations of the Republic of Kazakhstan 在哈萨克斯坦共和国武装部队、其他部队和军事编制中使用遥感数据的前景
Pub Date : 2021-01-01 DOI: 10.5937/VOJTEHG69-28698
E. Zakiev, S. Kozhakhmetov
Introduction/aim: This article is written to acquaint readers with the development of a space system of Earth remote sensing in the Republic of Kazakhstan using remote sensing data to support the Armed Forces, other troops and military formations of the Republic of Kazakhstan. Methods: An analytical approach to the study of the development of space and information technologies has led to qualitative changes in the field of remote sensing of the Earth. Conclusions were also made based on the analysis of the historical aspects of the formation and development of space systems for remote sensing of the Earth. This article deals with significant improvements in the field of geoinformation support to the Armed Forces, other troops and military formations in the interests of the security of the Republic of Kazakhstan using high-resolution satellite images from domestic spacecraft to create digital state topographic maps of the entire scale series with simultaneous updating. Results: The article provides a brief overview of remote sensing systems using geoinformation technologies in foreign countries and in the Republic of Kazakhstan. Conclusions: A special unit "Photogrammetric center for remote sensing and UAV data processing" is capable of processing data of remote sensing and UAVS for the armed forces, other troops and military units of the Republic of Kazakhstan. Data processing technologies have little in common with traditional processing and representation of geographical data, and finally, geographical data serves only as a basis for solving a large number of applied problems.
前言/目的:本文旨在使读者了解哈萨克斯坦共和国利用遥感数据发展地球遥感空间系统,以支持哈萨克斯坦共和国的武装部队、其他部队和军事编制。方法:研究空间和信息技术发展的分析方法导致了地球遥感领域的质变。在对地球遥感空间系统形成和发展的历史方面进行分析的基础上,还作出了结论。本文讨论了在地理信息支持领域的重大改进,以保障哈萨克斯坦共和国的安全,利用国内航天器的高分辨率卫星图像创建同步更新的全比例尺系列数字国家地形图。结果:本文简要概述了国外和哈萨克斯坦共和国利用地理信息技术的遥感系统。结论:“遥感和无人机数据处理摄影测量中心”是一个专门的单位,能够为哈萨克斯坦共和国武装力量、其他部队和军事单位处理遥感和无人机数据。数据处理技术与传统的地理数据处理和表示几乎没有共同之处,最后,地理数据只能作为解决大量应用问题的基础。
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引用次数: 1
Improvement of safety measures by applying a technical solution on the M-80A Infantry combat vehicle 通过在M-80A步兵战车上应用技术解决方案改进安全措施
Pub Date : 2021-01-01 DOI: 10.5937/vojtehg69-31837
Milan Končar, Anarbaev Odil, Dobrivoje Mutavdžić, G. Lazic, Željko Jokić
Introduction/purpose: The paper presents a solution for overcoming a possible problem - breach of safety measures when operating the BVP M80A Infantry Combat Vehicle on a training ground during tactical exercises and shooting at night. The crux of the problem is that the officer in charge of a tactical exercise and shooting is not in a position to observe in which direction the gunner-operator aims because no device has been installed on the BVP M-80A to signal this. Methods: After deploying the vehicle in practice and and on the basis of experience during shooting, it was concluded that there is a problem of controlling shooting at night and in reduced visibility conditions. Results: The paper provides a practical solution to prevent situations such as disorientation, impossibility of observing targets, and turning weapons towards the outside the shooting range boundaries, thus violating the security measures of all participants in the exercise including the BVP M80A unit itself. A technical improvement was implemented on the vehicle by installing a signaling device that gives visual information to the officer in charge of shooting in which direction the weapon is turned. Conclusion: The installed signaling device enables the officer who commands the exercise and shooting to be in control in a timely manner, eliminate possible causes of violation of security measures, and successfully implement the planned activity.
介绍/目的:针对BVP M80A步兵战车在训练场上进行战术演习和夜间射击时可能出现的安全措施违规问题,提出了一种解决方案。问题的关键在于,负责战术演习和射击的军官无法观察到炮手-操作员瞄准的方向,因为BVP M-80A上没有安装任何装置来发出信号。方法:在实际部署车辆后,根据拍摄过程中的经验,得出在夜间和能见度较低的条件下控制射击的问题。结果:本文提供了一种切实可行的解决方案,以防止出现迷失方向、无法观察目标、武器转向射击场边界外等情况,从而违反包括BVP M80A部队在内的所有演习参与者的安全措施。在车辆上进行了技术改进,安装了一个信号装置,可以向负责射击的军官提供武器转向的视觉信息。结论:安装的信号装置使指挥演习和射击的人员能够及时控制,消除违反安全措施的可能原因,顺利实施计划活动。
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引用次数: 0
Modelling and performance analysis of the BVP M-80A hybrid drive BVP M-80A混合动力传动的建模与性能分析
Pub Date : 2021-01-01 DOI: 10.5937/VOJTEHG69-28232
S. Milićević, S. Muždeka
Introduction: Hybrid technology has been successfully incorporated into the industry of passenger and commercial vehicles. Driven by the success and benefits that hybrid technology brings, many defense organizations around the world invest in the development of hybrid technology for combat vehicles and develop prototypes of tracked combat vehicles which have lower fuel consumption, better performance, better exhaust emission, and additional onboard electric power. However, various technical challenges must be resolved before it comes to the introduction of hybrid tracked combat vehicles in operational use. Several successful tests of prototypes have been conducted so far, but there are still restrictions on key technologies such as electric motors, electronics, and storage of electricity. In such conditions, where finance is limited, mistakes cannot be allowed nor spending a lot of resources on planning, building prototypes, and testing. Method: Therefore, it is clever to run the simulation software with which it is possible to examine various parameters in simulated conditions which more or less mimic real operating conditions. This paper aims to show one of possible solutions concerning the selection of appropriate technologies of hybrid drive, to propose a system solution for a hybrid BVP M80A, and to display a simulation hybrid drive model and the results obtained from the model devised in Simulink. Results: The results obtained by the simulation show that the proposed hybrid drive solution provides better performance while retaining key drivetrain elements of the vehicle. Conclusion: Only turning parameters are considered during the simulation but it is clear that the hybrid drivertrain has advantages related to straightline motion as well. Also, sound projections about the drivetrain performance and control can be made with the use of the proposed model.
导读:混合动力技术已成功应用于乘用车和商用车行业。在混合动力技术带来的成功和好处的推动下,世界各地的许多国防组织投资于战斗车辆混合动力技术的发展,并开发了履带式战斗车辆的原型,这些车辆具有更低的油耗、更好的性能、更好的废气排放和额外的机载电力。然而,在引入混合履带式作战车辆投入使用之前,必须解决各种技术挑战。到目前为止,已经进行了几次成功的原型测试,但在电动机、电子设备和电力存储等关键技术上仍然存在限制。在资金有限的情况下,不允许出现错误,也不允许在计划、构建原型和测试上花费大量资源。方法:因此,运行仿真软件是很聪明的,它可以在模拟条件下检查各种参数,这些条件或多或少地模拟了真实的操作条件。本文旨在展示混合动力驱动技术选择的一种可能解决方案,并针对混合动力BVP M80A提出了一种系统解决方案,并展示了一个仿真混合动力模型以及在Simulink中设计的模型所得到的结果。结果:仿真结果表明,所提出的混合动力方案在保留车辆关键动力传动元件的同时提供了更好的性能。结论:在仿真过程中只考虑了转向参数,但很明显混合动力传动系统在直线运动方面也具有优势。此外,利用所提出的模型,可以对动力传动系统的性能和控制进行合理的预测。
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引用次数: 3
Answers to the comments on the article "Monitoring COVID-19 is like instrument flying" submitted by David D. Pokrajac 针对David D. Pokrajac发表的文章《COVID-19监测就像仪器飞行》的评论
Pub Date : 2021-01-01 DOI: 10.5937/vojtehg69-32740
Petar Kočović
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引用次数: 0
On new military technologies and concepts explored from the Syrian conflict experience 从叙利亚冲突经验中探索新的军事技术和概念
Pub Date : 2021-01-01 DOI: 10.5937/vojtehg69-31659
N. Nikolić
Introduction/purpose: The purpose of this paper is to presents some tendencies stemming from the experiences from the ongoing Syrian conflict towards the development of new military concepts and technologies. The manner, scope and dynamics of exploitation of the combat experience from the Syrian conflict is a good example how great powers improve the capabilities of their defense systems. Methods: An extensive content analysis of selected reference sources has been applied. The system approach was used for a structural and balanced presentation of the available information. The comparative analysis has confirmed some similarities in the behavior of the great powers in terms of deploying and testing complex combat systems of strategic importance in local wars. Inductive thinking has contributed to the synthesis of appropriate conclusions. Results: Among the presence of several great and regional powers heavily involved in this conflict, Russia's is considered to be the most dominant and as such is the main subject of investigation in this paper. Field testing of new military equipment is known to be important but of extreme importance is its testing under real combat conditions. In parallel with intensive testing of a wide range of military technologies, there are indicators of developing new concepts, doctrines, and organizational upgrades on the basis of the Syrian combat experiences. Conclusion: From the standpoint of military technology and concept development, the Russian endeavor in Syria has become an example of a comprehensive and systematic aproach to learning, training, innovations, and implementations of the most relevant factors in the development of a modern military organization as a response to challenges of contemporary armed conflicts.
前言/目的:本文的目的是根据正在进行的叙利亚冲突的经验,提出一些发展新军事概念和技术的趋势。利用叙利亚冲突的战斗经验的方式、范围和动态是大国如何提高其防御系统能力的一个很好的例子。方法:对选定的参考文献进行了广泛的内容分析。系统方法用于结构化和平衡地表示现有信息。对比分析证实了大国在局部战争中部署和测试具有战略意义的复杂作战系统方面的一些相似之处。归纳思维有助于得出适当的结论。结果:在参与这场冲突的几个大国和地区大国中,俄罗斯被认为是最具主导地位的,因此是本文的主要研究对象。众所周知,新军事装备的实地测试是重要的,但最重要的是在实战条件下的测试。在对广泛的军事技术进行密集测试的同时,有迹象表明,在叙利亚战斗经验的基础上,发展了新的概念、理论和组织升级。结论:从军事技术和概念发展的角度来看,俄罗斯在叙利亚的努力已经成为一个全面和系统的学习、训练、创新和实施现代军事组织发展中最相关因素的例子,以应对当代武装冲突的挑战。
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引用次数: 0
From the early days of 962 unmanned aerial vehicles (UAVs) to their integration into wireless networks 从早期的962架无人驾驶飞行器(uav)到它们集成到无线网络
Pub Date : 2021-01-01 DOI: 10.5937/vojtehg69-33571
Z. Miličević, Z. Bojkovic
Introduction/purpose: This paper provides an overview of Unmanned Aerial Vehicles (UAVs) from their early days to their integration into modern wireless networks. Methods: It analyzes, synthesizes and compares the UAVs development technologies throughout their history with significant aspects of their integration in wireless communication networks. Results: Important aspects of wireless communications as one of the key technologies for UAVs are presented. Next, energy efficiency as a research path for UAVs is considered. The paper also emphasizes the present state in this area as well as what the future of UAVs in communications will be. Conclusion: UAVs are important not only for widespread military usage in various combat operations and warfare environment, but also for other purposes such as their integration in 5G networks.
前言/目的:本文概述了无人驾驶飞行器(uav)从早期发展到融入现代无线网络的全过程。方法:分析、综合和比较无人机发展历史及其在无线通信网络集成中的重要方面。结果:介绍了作为无人机关键技术之一的无线通信的重要方面。其次,考虑将能效作为无人机的研究路径。本文还强调了这一领域的现状以及未来无人机在通信领域的发展方向。结论:无人机不仅对各种作战行动和战争环境中的广泛军事用途很重要,而且对其他目的也很重要,例如它们在5G网络中的集成。
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引用次数: 1
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Vojnotehnicki Glasnik
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