期刊文献+
共找到305篇文章
< 1 2 16 >
每页显示 20 50 100
Adaptive threading strategy based on rolling characteristics analysis in hot strip rolling 被引量:2
1
作者 PENG Wen CHEN Shu-zong +2 位作者 GONG Dian-yao LIU Zi-ying ZHANG Dian-hua 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第7期1560-1572,共13页
In order to improve the threading stability and the head thickness precision in tandem hot rolling process, an adaptive threading strategy was proposed. The proposed strategy was realized by the rolling characteristic... In order to improve the threading stability and the head thickness precision in tandem hot rolling process, an adaptive threading strategy was proposed. The proposed strategy was realized by the rolling characteristics analysis, and factors which affect the rolling force and the final thickness were determined and analyzed based on the influence coefficients calculation process. An objective function consisting of the influenced factors was founded, and the disturbance quantity was obtained by minimizing the function with the Nelder-Mead simplex method, and the proposed adaptive threading strategy was realized based on the calculation results. The adaptive threading strategy has been applied to one 7-stand hot tandem mill successfully, actual statistics data show that the predicted rolling force prediction in the range of +/- 5.0% is improved to 97.8%, the head thickness precision in the range of +/- 35 mu m is improved to 98.5%, and the threading stability and the head thickness precision are enhanced to a high level. 展开更多
关键词 hot strip ROLLING ADAPTIVE threading ROLLING characteristics ANALYSIS influence COEFFICIENTS method SIMPLEX algorithm
下载PDF
Evaluation of threading dislocation density of strained Ge epitaxial layer by high resolution x-ray diffraction 被引量:1
2
作者 苗渊浩 胡辉勇 +3 位作者 李鑫 宋建军 宣荣喜 张鹤鸣 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第12期511-515,共5页
The analysis of threading dislocation density (TDD) in Ge-on-Si layer is critical for developing lasers, light emitting diodes (LEDs), photodetectors (PDs), modulators, waveguides, metal oxide semiconductor fiel... The analysis of threading dislocation density (TDD) in Ge-on-Si layer is critical for developing lasers, light emitting diodes (LEDs), photodetectors (PDs), modulators, waveguides, metal oxide semiconductor field effect transistors (MOSFETs), and also the integration of Si-based monolithic photonics. The TDD of Ge epitaxial layer is analyzed by etching or transmission electron microscope (TEM). However, high-resolution x-ray diffraction (HR-XRD) rocking curve provides an optional method to analyze the TDD in Ge layer. The theory model of TDD measurement from rocking curves was first used in zinc-blende semiconductors. In this paper, this method is extended to the case of strained Ge-on-Si layers. The HR-XRD 2θ/ω scan is measured and Ge (004) single crystal rocking curve is utilized to calculate the TDD in strained Ge epitaxial layer. The rocking curve full width at half maximum (FWHM) broadening by incident beam divergence of the instrument, crystal size, and curvature of the crystal specimen is subtracted. The TDDs of samples A and B are calculated to be 1.41108 cm-2 and 6.47108 cm-2, respectively. In addition, we believe the TDDs calculated by this method to be the averaged dislocation density in the Ge epitaxial layer. 展开更多
关键词 HR-XRD RPCVD threading dislocation density (TDD) etching pit density (EPD)
下载PDF
Electronic and optical properties of GaN/AlN quantum dots with adjacent threading dislocations
3
作者 叶寒 芦鹏飞 +4 位作者 俞重远 姚文杰 陈智辉 贾博雍 刘玉敏 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第4期375-380,共6页
We present a theory to simulate a coherent GaN QD with an adjacent pure edge threading dislocation by using a finite element method. The piezoelectric effects and the strain modified band edges are investigated in the... We present a theory to simulate a coherent GaN QD with an adjacent pure edge threading dislocation by using a finite element method. The piezoelectric effects and the strain modified band edges are investigated in the framework of multi-band κ · p theory to calculate the electron and the heavy hole energy levels. The linear optical absorption coefficients corresponding to the interband ground state transition are obtained via the density matrix approach and perturbation expansion method. The results indicate that the strain distribution of the threading dislocation affects the electronic structure. Moreover, the ground state transition behaviour is also influenced by the position of the adjacent threading dislocation. 展开更多
关键词 quantum dot threading dislocation electronic structure absorption efficiency
下载PDF
Efficient computation of Hash Hirschberg protein alignment utilizing hyper threading multi-core sharing technology
4
作者 Muhannad Abu-Hashem Adnan Gutub 《CAAI Transactions on Intelligence Technology》 SCIE EI 2022年第2期278-291,共14页
Due to current technology enhancement,molecular databases have exponentially grown requesting faster efficient methods that can handle these amounts of huge data.There-fore,Multi-processing CPUs technology can be used... Due to current technology enhancement,molecular databases have exponentially grown requesting faster efficient methods that can handle these amounts of huge data.There-fore,Multi-processing CPUs technology can be used including physical and logical processors(Hyper Threading)to significantly increase the performance of computations.Accordingly,sequence comparison and pairwise alignment were both found contributing significantly in calculating the resemblance between sequences for constructing optimal alignments.This research used the Hash Table-NGram-Hirschberg(HT-NGH)algo-rithm to represent this pairwise alignment utilizing hashing capabilities.The authors propose using parallel shared memory architecture via Hyper Threading to improve the performance of molecular dataset protein pairwise alignment.The proposed parallel hyper threading method targeted the transformation of the HT-NGH on the datasets decomposition for sequence level efficient utilization within the processing units,that is,reducing idle processing unit situations.The authors combined hyper threading within the multicore architecture processing on shared memory utilization remarking perfor-mance of 24.8%average speed up to 34.4%as the highest boosting rate.The benefit of this work improvement is shown preserving acceptable accuracy,that is,reaching 2.08,2.88,and 3.87 boost-up as well as the efficiency of 1.04,0.96,and 0.97,using 2,3,and 4 cores,respectively,as attractive remarkable results. 展开更多
关键词 computational biology high-performance computing Hyper threading pairwise sequence alignment parallel design sequence alignment SHARED-MEMORY
下载PDF
Numerical investigation on threading dislocation bending with InAs/GaAs quantum dots
5
作者 Guo-Feng Wu Jun Wang +8 位作者 Wei-Rong Chen Li-Na Zhu Yuan-Qing Yang Jia-Chen Li Chun-Yang Xiao Yong-Qing Huang Xiao-Min Ren Hai-Ming Ji Shuai Luo 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期146-150,共5页
The threading dislocations(TDs)in GaAs/Si epitaxial layers due to the lattice mismatch seriously degrade the performance of the lasers grown on silicon.The insertion of InAs quantum dots(QDs)acting as dislocation filt... The threading dislocations(TDs)in GaAs/Si epitaxial layers due to the lattice mismatch seriously degrade the performance of the lasers grown on silicon.The insertion of InAs quantum dots(QDs)acting as dislocation filters is a pretty good alternative to solving this problem.In this paper,a finite element method(FEM)is proposed to calculate the critical condition for InAs/GaAs QDs bending TDs into interfacial misfit dislocations(MDs).Making a comparison of elastic strain energy between the two isolated systems,a reasonable result is obtained.The effect of the cap layer thickness and the base width of QDs on TD bending are studied,and the results show that the bending area ratio of single QD(the bending area divided by the area of the QD base)is evidently affected by the two factors.Moreover,we present a method to evaluate the bending capability of single-layer QDs and multi-layer QDs.For the QD with 24-nm base width and 5-nm cap layer thickness,taking the QD density of 10^(11) cm^(-2) into account,the bending area ratio of single-layer QDs(the area of bending TD divided by the area of QD layer)is about 38.71%.With inserting five-layer InAs QDs,the TD density decreases by 91.35%.The results offer the guidelines for designing the QD dislocation filters and provide an important step towards realizing the photonic integration circuits on silicon. 展开更多
关键词 InAs/GaAs quantum dots threading dislocation finite element method bending area
下载PDF
Simultaneous Multithreading Fault Tolerance Processor
6
作者 DONGLan HUMing-zeng +3 位作者 JIZhen-zhou CUIGuang-zuo TANGXin-min HEFeng 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第1期17-20,共4页
Transient fault detection mechanism is added to simultaneous multithreading architecture. By exploiting both ILP (Instruction Level Parallelism) and TLP (Thread Level Parallelism), Simultaneous Multithreading (SMT) Fa... Transient fault detection mechanism is added to simultaneous multithreading architecture. By exploiting both ILP (Instruction Level Parallelism) and TLP (Thread Level Parallelism), Simultaneous Multithreading (SMT) Fault Tolerance Processor can be expected to achieve better tradeoff between performance and hardware cost than traditional Fault Tolerance Processors. Detailed simulations of 3 of SPEC95 benchmarks show that executing two redundant programs on the fault-tolerant microarchitecture takes only 40%–61%longer than running a single version of the program. The new instruction fetch algorithm enhances the performance by 0.4%~1%to most of the benchmarks we choose randomly. 展开更多
关键词 Key words simultaneous multithreading rault tolerance TLP (Thread Level Parallelism) fetch policy
下载PDF
Threading dislocation density comparison between GaN grown on the patterned and conventional sapphire substrate by high resolution X-ray diffraction 被引量:5
7
作者 ZHANG YuChao1, XING ZhiGang2, MA ZiGuang2, CHEN Yao2, DING GuoJian2, XU PeiQiang2, DONG ChenMing3, CHEN Hong2 & LE XiaoYun1 1 School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100190, China 2 Renewable Energy Laboratory, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 3 School of Information and Communication, Tianjin Polytechnic University, Tianjin 300160, China 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2010年第3期465-468,共4页
GaN epifilms are grown on the patterned sapphire substrates (PSS) (0001) and the conventional sapphire substrates (CSS) (0001) by metal-organic chemical vapor deposition (MOCVD) using a novel two-step growth. High res... GaN epifilms are grown on the patterned sapphire substrates (PSS) (0001) and the conventional sapphire substrates (CSS) (0001) by metal-organic chemical vapor deposition (MOCVD) using a novel two-step growth. High resolution X-ray diffraction (HR-XRD) is used to investigate the threading dislocation (TD) density of the GaN epifilms. The TD density is calculated from the ω-scans full width at half maximum (FWHM) results of HR-XRD. The edge dislocation destiny of GaN grown on the PSS is 2.7×108 cm-2, which is less than on the CSS. This is confirmed by the results of atomic force microscopy (AFM) measurement. The lower TD destiny indicates that the crystalline quality of the GaN epifilms grown on the PSS is improved compared to GaN epifilms grown on the CSS. The residual strains of GaN grown on the PSS and CSS are compared by Raman Scattering spectra. It is clearly seen that the residual strain in the GaN grown on PSS is lower than on the CSS. 展开更多
关键词 GAN patterned SAPPHIRE substrate threading DISLOCATION XRD
原文传递
Application of Adaptive Threading Technique to Hot Strip Mill 被引量:2
8
作者 DING Jing-guo HU Xian-lei +2 位作者 JIAO Jing-min SHE Guang-fu LIU Xiang-hua 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2008年第5期29-31,36,共4页
Thickness deviation of hot strip rolling needs to be strictly controlled in the computer system. An adaptive threading technique was researched, in which the measured data from threaded stands were used to predict thi... Thickness deviation of hot strip rolling needs to be strictly controlled in the computer system. An adaptive threading technique was researched, in which the measured data from threaded stands were used to predict thickness and material hardness errors, to modify the setup for the remaining unthreaded stands. After the adaptive threading model was used online on the hot strip mill of the Panzhihua Iron and Steel Group Co Ltd, the thickness deviation was decreased obviously. The hit rate of thickness control of different steel grades increases. 展开更多
关键词 hot strip mill adaptive threading thickness deviation stretch equation
原文传递
The Characteristic of Threading Dislocation in Different Structures GaN Films Grown by MOCVD 被引量:1
9
作者 Min Lu, Zilan Li, Zhijian Yang, Zonghui Li, Bei Zhang, Guoyi Zhang Research Center for Wide-Band Semiconductor materials, Peking University, Beijing 100871 P.R.China 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期861-862,共2页
Three mechanisms to reduce threading dislocations(TDs) in GaN films as the epitaxial films grow thicker are suggested by SEM and
关键词 GAN on The Characteristic of threading Dislocation in Different Structures GaN Films Grown by MOCVD in of by
原文传递
Optimization of thread partitioning parameters in speculative multithreading based on artificial immune algorithm 被引量:1
10
作者 Yu-xiang LI Yin-liang ZHAO +1 位作者 Bin LIU Shuo JI 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2015年第3期205-216,共12页
Thread partition plays an important role in speculative multithreading (SpMT) for automatic parallelization of ir- regular programs. Using unified values of partition parameters to partition different applications l... Thread partition plays an important role in speculative multithreading (SpMT) for automatic parallelization of ir- regular programs. Using unified values of partition parameters to partition different applications leads to the fact that every ap- plication cannot own its optimal partition scheme. In this paper, five parameters affecting thread partition are extracted from heuristic rules. They are the dependence threshold (DT), lower limit of thread size (TSL), upper limit of thread size (TSU), lower limit of spawning distance (SDL), and upper limit of spawning distance (SDU). Their ranges are determined in accordance with heuristic rules, and their step-sizes are set empirically. Under the condition of setting speedup as an objective function, all com- binations of five threshold values form the solution space, and our aim is to search for the best combination to obtain the best thread granularity, thread dependence, and spawning distance, so that every application has its best partition scheme. The issue can be attributed to a single objective optimization problem. We use the artificial immune algorithm (AIA) to search for the optimal solution. On Prophet, which is a generic SpMT processor to evaluate the performance of multithreaded programs, Olden bench- marks are used to implement the process. Experiments show that we can obtain the optimal parameter values for every benchmark, and Olden benchmarks partitioned with the optimized parameter values deliver a performance improvement of 3.00% on a 4-core platform compared with a machine learning based approach, and 8.92% compared with a heuristics-based approach. 展开更多
关键词 Speculative multithreading Thread partitioning Artificial immune algorithm
原文传递
Comprehensive Survey of the Landscape of Digital Twin Technologies and Their Diverse Applications
11
作者 Haiyu Chen Haijian Shao +2 位作者 Xing Deng Lijuan Wang Xia Wang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第1期125-165,共41页
The concept of the digital twin,also known colloquially as the DT,is a fundamental principle within Industry 4.0 framework.In recent years,the concept of digital siblings has generated considerable academic and practi... The concept of the digital twin,also known colloquially as the DT,is a fundamental principle within Industry 4.0 framework.In recent years,the concept of digital siblings has generated considerable academic and practical interest.However,academia and industry have used a variety of interpretations,and the scientific literature lacks a unified and consistent definition of this term.The purpose of this study is to systematically examine the definitional landscape of the digital twin concept as outlined in scholarly literature,beginning with its origins in the aerospace domain and extending to its contemporary interpretations in the manufacturing industry.Notably,this investigationwill focus on the research conducted on Industry 4.0 and smartmanufacturing,elucidating the diverse applications of digital twins in fields including aerospace,intelligentmanufacturing,intelligent transportation,and intelligent cities,among others. 展开更多
关键词 Digital twins Industry 4.0 smart manufacturing digital thread modeling simulation
下载PDF
Analysis of secondary makeup characteristics of drill collar joint and prediction of downhole equivalent impact torque of Well SDTK1
12
作者 WANG Chunsheng MING Chuanzhong +4 位作者 ZHANG Hao CHEN Jialei QU Hao WANG Wenchang DI Qinfeng 《Petroleum Exploration and Development》 SCIE 2024年第3期697-705,共9页
Based on the three-dimensional elastic-plastic finite element analysis of the 8"(203.2 mm)drill collar joint,this paper studies the mechanical characteristics of the pin and box of NC56 drill collar joints under ... Based on the three-dimensional elastic-plastic finite element analysis of the 8"(203.2 mm)drill collar joint,this paper studies the mechanical characteristics of the pin and box of NC56 drill collar joints under complex load conditions,as well as the downhole secondary makeup features,and calculates the downhole equivalent impact torque with the relative offset at the shoulder of internal and external threads.On the basis of verifying the correctness of the calculation results by using measured results in Well GT1,the prediction model of the downhole equivalent impact torque is formed and applied in the first extra-deep well with a depth over 10000 m in China(Well SDTK1).The results indicate that under complex loads,the stress distribution in drill collar joints is uneven,with relatively higher von Mises stress at the shoulder and the threads close to the shoulder.For 203.2 mm drill collar joints pre-tightened according to the make-up torque recommended by American Petroleum Institute standards,when the downhole equivalent impact torque exceeds 65 kN·m,the preload balance of the joint is disrupted,leading to secondary make-up of the joint.As the downhole equivalent impact torque increases,the relative offset at the shoulder of internal and external threads increases.The calculation results reveal that there exists significant downhole impact torque in Well SDTK1 with complex loading environment.It is necessary to use double shoulder collar joints to improve the impact torque resistance of the joint or optimize the operating parameters to reduce the downhole impact torque,and effectively prevent drilling tool failure. 展开更多
关键词 Well SDTK1 drill tool threaded joint secondary makeup relative offset equivalent impact torque
下载PDF
Roller Screw and Threaded Chain Speed Reducer: An Experimental Evaluation
13
作者 Filiberto Gutiérrez 《Modern Mechanical Engineering》 2024年第1期1-11,共11页
We are developing a speed reducer that can be considered a transformation of a worm gear reducer: the worm is replaced by an inverted roller screw, and the gear is replaced by a threaded chain drive. This configuratio... We are developing a speed reducer that can be considered a transformation of a worm gear reducer: the worm is replaced by an inverted roller screw, and the gear is replaced by a threaded chain drive. This configuration lessens wear, increases load capacity, and improves efficiency. The threaded chain consists of nut-shaped links. This paper presents the results of tests carried out on a prototype with a reduction ratio of 46. 展开更多
关键词 Speed Reducer Inverted Roller Screw Chain Drive Threaded Chain Drive
下载PDF
Low threading dislocation density in GaN films grown on patterned sapphire substrates
14
作者 梁萌 王国宏 +8 位作者 李鸿渐 李志聪 姚然 王兵 李盼盼 李璟 伊晓燕 王军喜 李晋闽 《Journal of Semiconductors》 EI CAS CSCD 2012年第11期24-27,共4页
The growth process of three-dimensional growth mode(3D) switching to two-dimensional growth mode (2D) is investigated when GaN films are grown on cone-shaped patterned sapphire substrates by metal-organic chemical... The growth process of three-dimensional growth mode(3D) switching to two-dimensional growth mode (2D) is investigated when GaN films are grown on cone-shaped patterned sapphire substrates by metal-organic chemical vapor deposition.The growth condition of the 3D-2D growth process is optimized to reduce the threading dislocation density(TDD).It is found that the condition of the 3D layer is critical.The 3D layer keeps growing under the conditions of lowⅤ/Ⅲratio,low temperature,and high pressure until its thickness is comparable to the height of the cone-shaped patterns.Then the 3D layer surrounds the cone-shaped patterns and has inclined side facets and a top(0001) plane.In the following 2D-growth process,inclined side facets coalesce quickly and the interaction of TDs with the side facets causes the TDs to bend over.As a result,the TDD of GaN films can decrease to 1×10~8 cm^(-2),giving full-width at half maximum values of 211 and 219 arcsec for(002) and(102) omega scans, respectively. 展开更多
关键词 threading dislocation GaN pattern sapphire substrate metal organic chemical vapor deposition
原文传递
Evolution of microstructure, stress and dislocation of AlN thick film on nanopatterned sapphire substrates by hydride vapor phase epitaxy
15
作者 王闯 高晓冬 +7 位作者 李迪迪 陈晶晶 陈家凡 董晓鸣 王晓丹 黄俊 曾雄辉 徐科 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第2期399-404,共6页
A crack-free AlN film with 4.5 μm thickness was grown on a 2-inch hole-type nano-patterned sapphire substrates(NPSSs) by hydride vapor phase epitaxy(HVPE). The coalescence, stress evolution, and dislocation annihilat... A crack-free AlN film with 4.5 μm thickness was grown on a 2-inch hole-type nano-patterned sapphire substrates(NPSSs) by hydride vapor phase epitaxy(HVPE). The coalescence, stress evolution, and dislocation annihilation mechanisms in the AlN layer have been investigated. The large voids located on the pattern region were caused by the undesirable parasitic crystallites grown on the sidewalls of the nano-pattern in the early growth stage. The coalescence of the c-plane AlN was hindered by these three-fold crystallites and the special triangle void appeared. The cross-sectional Raman line scan was used to characterize the change of stress with film thickness, which corresponds to the characteristics of different growth stages of AlN. Threading dislocations(TDs) mainly originate from the boundary between misaligned crystallites and the c-plane AlN and the coalescence of two adjacent c-plane AlN crystals, rather than the interface between sapphire and AlN. 展开更多
关键词 hydride vapor phase epitaxy(HVPE) ALN threading dislocations nano-patterned sapphire substrate
下载PDF
基于BL602的RT Thread移植方法研究
16
作者 袁雷 张新晨 《单片机与嵌入式系统应用》 2023年第10期19-22,共4页
RT Thread是一款嵌入式实时操作系统,因其易于移植、可裁剪性好等特点备受广大嵌入式开发者的喜爱。BL602芯片内含一个32位的RISC V架构的微处理器,兼具高性能、超低功耗等特点。但目前关于将RT Thread实时操作系统移植到BL602芯片上还... RT Thread是一款嵌入式实时操作系统,因其易于移植、可裁剪性好等特点备受广大嵌入式开发者的喜爱。BL602芯片内含一个32位的RISC V架构的微处理器,兼具高性能、超低功耗等特点。但目前关于将RT Thread实时操作系统移植到BL602芯片上还没有成熟的方案,针对这一现象,给出了将RT Thread移植到BL602上的详细方案。通过剪裁源码、修改配置文件、修改系统时钟、添加串口输出、采用轮询或中断回调实现串口输入等操作进行移植。实验结果表明,移植到BL602上的RT Thread操作系统可以正常运行,并且具备任务管理、任务调度等功能。本文提出的移植方案不仅可以降低BL602的开发难度、提高CPU的利用率,而且为其他RTOS移植提供了参考。 展开更多
关键词 RT Thread 实时操作系统移植 RISC V BL602
下载PDF
Summary and clinical application of Zhuang medicine medicated thread moxibustion 被引量:1
17
作者 Yang-Meng Cao De-Yuan Qin +5 位作者 Xiang-Yu Deng Dan-Dan Chen Zong-Xi Sun Cheng-Long Wang Zu-Jie Qin Jin-Ming Huang 《TMR Non-Drug Therapy》 2023年第2期25-30,共6页
Zhuang medicine medicated thread moxibustion is a kind of external therapy with ethnic medicine characteristics that spreads in Guangxi Zhuang region.It has a wide range of clinical application and significant curativ... Zhuang medicine medicated thread moxibustion is a kind of external therapy with ethnic medicine characteristics that spreads in Guangxi Zhuang region.It has a wide range of clinical application and significant curative effect,and can be used to treat diseases such as internal medicine,surgery,dermatology,gynecology,pediatrics,and five sense organs.Through reviewing and combing the literature on the Zhuang medicine medicated thread moxibustion in recent years,this paper summarizes and prospects its clinical application,with a view to further explaining the basic principles and application rules of Zhuang medicine medicated thread moxibustion and digging its clinical value. 展开更多
关键词 Zhuang medicine medicated thread moxibustion external therapy clinical research
下载PDF
The dynamic response of a high-density polyethylene slow-release structure under launching overload
18
作者 Ke-Bin Zhang Wen-Bin Li +2 位作者 Yu Zheng Wen-Jin Yao Chang-Fang Zhao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第8期143-156,共14页
Based on the 60 mm artillery grenade,a slow-release structure was designed to reduce the severity of ammunitions response to accidental thermal stimulation and improve the thermal stability of ammunitions.The slow-rel... Based on the 60 mm artillery grenade,a slow-release structure was designed to reduce the severity of ammunitions response to accidental thermal stimulation and improve the thermal stability of ammunitions.The slow-release structure was made of high-density polyethylene(HDPE) and connected the fuse and the projectile body through internal and external threads.To study the safety of the slowrelease structure under artillery launching overload,mechanical analysis of the slow-release structure was simulated via finite element analysis(FEA).The impacts of various factors(e.g.,fuse mass,number of threads,and nominal diameter of internal threads of the slow-release structure) on the connection strength of the slow-release structure were studied.A strength-prediction model based on the fuse mass and internal thread parameters was established by fitting the maximum effective stress of the slowrelease structure.This led to good prediction results.In conclusion,this study provides references and theoretical support for the design of thermal protection structures insensitive to ammunition. 展开更多
关键词 Artillery ammunition HDPE Finite element analysis Slow-release structure Threaded connection
下载PDF
Security Threads and IoT Security
19
作者 Dona Alkunidry Shahad Alhuwaysi Rawan Alharbi 《Journal of Computer and Communications》 2023年第9期76-83,共8页
One of the technologies that have attracted the most attention recently across a variety of applications is the Internet of Things (IoT). The Internet of Things (IoT) is the combination of sensor, embedded computing, ... One of the technologies that have attracted the most attention recently across a variety of applications is the Internet of Things (IoT). The Internet of Things (IoT) is the combination of sensor, embedded computing, and communication technologies. The goal of the Internet of Things is to provide seamless services to anything, everywhere, at any time. The internet of things (IoT) technologies plays a vital role everywhere after the internet and information and communication technology, ushering in the fourth disruptive technology revolution (ICT). For real-time processing, communication, and monitoring, the smart items are linked together through wired or wireless connections. Implementing the IoT system presents security and privacy challenges since IoT devices are incompatible with current security standards based on tradition. This paper discusses IoT security strands, mitigation strategies, and privacy issues. This study’s major objective is to get more knowledge about security threats, mitigation techniques, and privacy concerns in IoT devices. The authors also mentioned a few cutting-edge technologies that can address general security problems. This study’s major objectives are to find research gaps in IoT security and match solution paradigms. The advent and rapid growth of the Internet of Things (IoT), which offers innumerable benefits, facilities, and applications including smart grids, smart homes, smart cities, and intelligent transportation systems (ITS), have an impact on everyone’s life. However, the deployment and use of sensing devices exposes IoT-based systems and applications to many security flaws and attacks. Furthermore, the lack of standardization brought on by the diversity of devices and technologies makes integrating security in the IoT a severe problem. The purpose of this review paper is to highlight the numerous security threats, challenges, and attacks that IoT-enabled applications face. 展开更多
关键词 Internet of Things Security Threads Mitigation Measures PRIVACY
下载PDF
Causal Circular Narrative and Time-Space Construction of the Movie Little Big Woman
20
作者 ZHAO Zhi-qing 《Journal of Literature and Art Studies》 2023年第2期122-128,共7页
Chinese film Little Big Woman takes the father’s funeral as the main line to tell the story of family affection and real-life emotional entanglements.In the narrative with multiple clues,we go back to find the hidden... Chinese film Little Big Woman takes the father’s funeral as the main line to tell the story of family affection and real-life emotional entanglements.In the narrative with multiple clues,we go back to find the hidden reasons,and the gradually clear reflection of the past is related to the real situation of the characters.Causal cycle narrative is not only a narrative strategy,but also a narrative logic with deep Chinese traditional cultural and philosophical connotations. 展开更多
关键词 Little Big Woman CAUSALITY temporal and spatial processing narrative thread
下载PDF
上一页 1 2 16 下一页 到第
使用帮助 返回顶部