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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->机械工程·物理学·电子科学与技术]]></title>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[GaN power devices and their radiation effects for space applications]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401016]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[It is of great significance to study GaN(gallium nitride) power devices and their radiation effects to meet the needs of space applications and promote the construction of a new generation spacecraft. Main structures and working principles of GaN power devices were introduced. Research progress of total ionizing dose effect and single event effect of GaN power devices in recent years was reviewed. Degradation and damage mechanisms of GaN devices caused by radiation effects were analyzed and discussed. Research results show that GaN power devices have strong resistance to total ionizing dose. However, GaN power devices are prone to leakage and single event burnout due to their weak resistance to single event burnout, and most of the burnout points occur at the drain side of the gate edge. Research on the radiation damage mechanism of GaN power devices lacks authoritative theories and needs to be further mastered to provide theoretical support for their space application. GaN power devices with planar structure are the current mainstream technical solutions. Monolithic integration, high frequency and miniaturization are the development directions of GaN power devices in the future.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[BI Jinshun, SHEN Lizhi, MEI Bo, CAO Shuang, SUN Yi, YU Qingkui]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>BI Jinshun, SHEN Lizhi, MEI Bo, CAO Shuang, SUN Yi, YU Qingkui</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401016]]></guid><cfi:id>9</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Protocol of neighbor discovery in directional millimeter wave wireless networks]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the problem that it is difficult to discover neighbors without prior information of sector direction between nodes in the directional millimeter wave network, a neighbor discovery protocol base on blind rendezvous algorithm was proposed and the theoretical relationship among slot length, the number of sectors and the time of neighbors discovery was derived. Furthermore, in order to shorten the time of neighbor discovery base on blind rendezvous algorithm, a neighbor discovery protocol based on location prediction was proposed. Simulation results showed that the longest discovery time of neighbor discovery protocol base on blind rendezvous algorithm is less than that of ODND(oblivious directional neighbor discovery) protocol and average discovery time of neighbor discovery protocol base on blind rendezvous algorithm is less than ODND protocol when the number of sectors <i>N</i> is close to 2n(2n－1<N≤2<sup>n</sup>,n>1,n∈Z). In addition, neighbor discovery protocol based on location prediction can effectively shorten neighbor discovery time.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[LIANG Shijie, ZHAO Haitao, ZHANG Jiao, CHEN Haitao, WEI Jibo, WANG Junfang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIANG Shijie, ZHAO Haitao, ZHANG Jiao, CHEN Haitao, WEI Jibo, WANG Junfang</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401017]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Motion model of spherical fragments penetrating gelatin and sensitivity analysis of fragment parameters]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To reveal the injury mechanism of spherical fragments to human tissue, gelatin was used as a substitute for human tissue. Based on the theory of dynamic cavity expansion, the segmental motion theoretical model of spherical fragments penetrating gelatin was established by considering the velocity attenuation of spherical fragments in the stage of incomplete entering stage, and the motion law of spherical fragments penetrating gelatin was studied. The correctness of the model was verified by the experiments of steel balls and tungsten balls penetrating gelatin, and the optimal drag coefficients in the model were solved. The sources of errors in the theoretical calculation process were analyzed, and the expression of dimensionless penetration depth was derived. A sensitivity analysis of the influence of spherical fragment parameters (diameter, density and velocity) on the penetration depth was carried out by using the Sobol′ method. The results show that the motion model can well simulate the motion law of spherical fragments. The velocity attenuation of low-density spherical fragments in the incomplete entering stage cannot be ignored. The sensitivity of spherical fragment parameters to the effect of penetration depth is in descending order of velocity, density and diameter.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[JIANG Mingfei, CHEN Li, LIU Kun, ZHAO Lei, WU Zhilin]]></author>
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<atom:name>JIANG Mingfei, CHEN Li, LIU Kun, ZHAO Lei, WU Zhilin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401018]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Consistency adjustment method for pairwise comparison matrix in analytic hierarchy process based on weights]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Calculated weights by traditional PCM(pairwise comparison matrix) adjustment methods can′t retain the information of the original PCM to the maximum extent. Therefore, a method for PCM modulation based on the weights was proposed. The method constructed a completely consistent matrix according to the properties of weights, and the matrix was fitted by the AdaGrad method, so as to minimize the total change of the matrix relative to the original PCM. Corresponding weights was taken as the calculation result of the matrix. Numerical results show that this method can significantly improve the retention of original PCM information compared with other methods and does not require repeated consistency checking.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[GENG Zhenglin, WU Jiani, CHENG Xinghua, BAO Changchun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GENG Zhenglin, WU Jiani, CHENG Xinghua, BAO Changchun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401019]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Weight-optimized WENO-Z schemes with reorganized stencil]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[For developing high-order scheme with low dissipation and low dispersion to accurately simulate the flow field with complex structures such as shock wave, a method of stencil reorganization was proposed based on the fifth-order finite difference WENO-Z scheme. A four-point central stencil recombined by three-point stencils is introduced in the calculation of WENO nonlinear weight in order to optimize the weight allocation of each template in the original format, and two improved WENO-Z schemes were proposed. The dispersion and dissipation properties of the schemes were compared and analyzed via the approximate dispersion relation analysis, which shows that the dissipation of the two improved schemes decreases at different extent. The numerical experiments show that the improved schemes have better shock capture property and higher resolution for small-scale flow structures.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[CHAI Delin, WANG Qiang, YI Xian, LIU Yu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHAI Delin, WANG Qiang, YI Xian, LIU Yu</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401020]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[On-chip cache design method for cooperative memory compilation and layout]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401021]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to improve the speed of on-chip cache and reduce the area and power consumption, an on-chip cache design method based on cooperative memory compilation and layout was proposed. This method estimated the timing margin of memory array based on its different spatial positions on chip, and then performed memory compilation through exhaustive combination of various configuration parameters such as splitting/ merging, size adjustment, threshold replacement and aspect ratio deformation. The best static random-access memory compilation configuration was selected according to the timing margin. This method was integrated with the existing physical design steps into a complete design flow. Experimental results show that this method can reduce the power consumption by about 9.9% and the critical path delay by 7.5%.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[LIU Biwei, XIONG Qi, YANG Ming, SONG Yulu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Biwei, XIONG Qi, YANG Ming, SONG Yulu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401021]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Intelligent prediction model for ammunition storage microenvironment temperature]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401022]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[It is the key for evaluating and prolonging the life of ammunition to acquire the temperature variation law of ammunition storage microenvironment efficiently and accurately. With the help of the neural network and the heat transfer theory, a model for predicting the microenvironment of ammunition storage was studied, and based on the model, a set of ammunition packaging box prediction software was developed to predict the temperature changes inside the box under different climatic environment. Relevant test was progressed to verify the software correctness and parameter optimization in Dunhuang and Mohe. Results show that with the help of the microenvironment prediction software of packing box developed on the basis of the neural networks algorithm, the microenvironment temperature control can be achieved by adjusting the storage location and storage initial temperature according to different packaging box materials.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[ZHANG Yun, DU Qin, WANG Jingcheng, ZHANG Zhiming, XIE Lanchuan, CHEN Yang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Yun, DU Qin, WANG Jingcheng, ZHANG Zhiming, XIE Lanchuan, CHEN Yang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401022]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of blade number on performance of hubless pump-jet thruster]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to enrich the optimization theory of hubless pump-jet thruster noise performance, the influence of blade number on the performance of hubless pump-jet thruster was studied, and the variation law of pressure pulsation in hubless pump-jet thruster with different number of blades was emphatically investigated. Based on the finite volume element method of computational fluid dynamics, the RANS equation was discretized, and the calculation model was closed by using RNG k-ε turbulence model, coupling the pressure-velocity by using the SIMPLEC. The unsteady numerical simulation of the flow field inside the hubless pump-jet thruster with different number of blades was carried out, and the calculated results were compared and analyzed in detail. The study results show that with the increase of blade number, the head, efficiency and thrust of hubless pump-jet thruster model increase gradually. The pressure distribution on the blade surface becomes more uniform. The pressure pulsations of the impeller rim and the middle part decreased obviously. The amplitude of pressure pulsations at the main frequencies of impeller inlet and outlet decreases gradually from rim to center.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[TAN Minggao, HU Sheng, LIU Houlin, MA Haochen, ZHU Zhipeng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>TAN Minggao, HU Sheng, LIU Houlin, MA Haochen, ZHU Zhipeng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401023]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Improved ADC model for launch vehicle survivability in typical combat flow and graded environment]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401024]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to comprehensively evaluate the survivability of launch vehicles in combat, a weapon equipment evaluation space was established by distinguishing parameters-performance-capability-effectiveness at four levels. In view of the survivability assessment of launch vehicles, graded five types of natural environment, three levels of threat environment and three kinds of combat flow status, the impact of external environment was taken as the necessary conditions of effectiveness evaluation, and an evaluation framework of three dimensions of object, content and level was constructed.The detection probability and damage probability were used to characterize the camouflage ability and anti-damage protection ability of launch vehicles, and the continuous transfer probability matrix of launch vehicles′ combat status was established. A comprehensive evaluation model of launch vehicle based on improved availability, dependability, capability model under typical combat flow and graded environment was proposed. Through simulation analysis, the survivability of various launch vehicles varies significantly in different environments and combat status, the model can dynamically evaluate the survivability of launch vehicles from multiple dimensions of performance space, environment space and combat flow space, and put forward optimization and quantitative suggestions for the performance design and battlefield application of launch vehicles.]]></description>
<pubDate>2024/1/28 0:00:00</pubDate>
<category><![CDATA[机械工程·物理学·电子科学与技术]]></category>
<author><![CDATA[WANG Dong, GAO Qinhe, HUANG Tong, LIU Zhihao]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Dong, GAO Qinhe, HUANG Tong, LIU Zhihao</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202401024]]></guid><cfi:id>1</cfi:id><cfi:read>true</cfi:read></item>
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