一种基于硬件特征和动态许可证的移动App软件授权认证模型（英文）

软件版权保护是知识产权保护体系中的重要组成部分。随着鱼洞互联网的快速发展,软件架构和授权正面临新的挑战。事实证明,目前移动互联网亟需一种新的软件保护机制。基于研究者前期的工作,分析了移动互联网的特性,将整个版权保护过程分为3个状态共8个步骤,提出了一种新的支持动态许可证的分布式移动App软件授权认证模型。与以前相关工作相比,新模型在在可行性、安全性和完备性等方面有许多优点。     

软件浮动授权辅助系统的研究

软件采用浮动授权的方式向用户开放授权时,在授权过程中经常出现软件授权被长期无效占用的情况。本文设计了一种后台浮动授权辅助监控系统,该系统采用后台实时监控控制的方法,当软件长时间处于无操作状态时可强制下线。通过软件浮动授权辅助系统对CAX类软件进行测试,结果显示系统很好地解决了授权被长期无效占用的问题,并在很大的程度上提高了软件授权的利用率。     

一种转动轴与移动轴并联的数控砂轮修整器

介绍一种已获专利授权的数控磨床砂轮修整器,它具有2移动轴 1转动轴的三轴联动功能,它的特点是修整工具能绕修整工具刃口的圆弧圆心转动,可不考虑绕转动轴的转动对两移动轴的影响,即转动轴与移动轴并联,可大大简化数控编程.     

一种新型的移动闪光焊轨机供电系统

针对传统柴油发电机组给移动闪光焊轨机供电的不足,提出一种新型移动闪光焊轨机供电系统.通过分析移动闪光焊轨机工作特性,提出采用超级电容器与双向DC/DC功率变换器连接后通过开关与蓄电池组并联,构成蓄电池-超级电容混合储能供电系统应用于驱动移动闪光焊轨机工作.建立了其复合储能系统仿真模型并进行测试,同时通过系统样机的产品开...     

基于DYNAFORM与SVR建模的拼焊板冲压成形焊缝移动分析

利用Dynaform数值模拟软件和SVR支持向量机算法对影响焊缝移动的强度系数比、厚度比、压边力大小及分布、拉延筋阻力大小、凹模圆角半径、摩擦因数六个参数进行建模分析。通过对建模结果的分析比较可知,在强度比或厚度比一定条件下,随着参数选择的连续变化,焊缝移动量存在最小值;同时,利用所建模型可以对一定工艺参数下的拼焊板焊缝移动进行快速预测,节省了仿真计算时间,提高了工作效率,为拼焊板的焊缝移动控制提供新的思路和依据。     

轨道式焊接机器人的虚拟样机设计与仿真

针对受损的水轮机叶片等具有空间复杂曲面结构,在其安装位置直接进行修复工作,设计了一种基于移动平台的焊接机器人虚拟样机。为确定焊枪末端与机器人6个关节之间的运动关系,建立虚拟样机DH坐标系,借助Matlab软件得到运动学方程正、逆解。将在Solid Works软件中建立的焊接机器人三维模型,导入ADAMS仿真软件进行运动学分析。仿真结果表明:机器人在狭窄空间启动时,由滑动、转动关节运动引起的焊枪末端空间位移变化小,速度、加速度曲线变化平缓,无任何突变,证明了该虚拟样机设计的有效性,满足基坑内的焊接工作要求。     

铁矿石移动床还原动力学

提出了一个移动床还原过程的数学模型,并由实验证实,这一模型也能描述实际工业规模的铁矿石移动床还原反应器.利用此模型对移动床还原过程进行了研究,发现了和经典动力学观点有所不同的有关竖炉和高炉固相区还原过程的一些特点和规律,如:所有因素对还原的影响均减弱;H_2的还原能力并不一定总是优越于 CO;传统的热交换曲线应有所改进;对还原过程的反应空区有了新的解释.     

MATH-MODEL FOR KINETICS OF IRON ORE REDUCTION IN MOVING BED

提出了一个移动床还原过程的数学模型,并由实验证实,这一模型也能描述实际工业规模的铁矿石移动床还原反应器.利用此模型对移动床还原过程进行了研究,发现了和经典动力学观点有所不同的有关竖炉和高炉固相区还原过程的一些特点和规律,如:所有因素对还原的影响均减弱;H_2的还原能力并不一定总是优越于 CO;传统的热交换曲线应有所改进;对还原过程的反应空区有了新的解释.     

基于电动静液作动器虚拟试验仿真平台下的多学科建模技术

针对EHA(电动静液作动器)作为多学科复杂产品在单一软件环境下不易精确建模的特点,借助MATLAB/SIMULINK中新增模块库SIMSCAPE的部分功能组件,提出一种新的建模方法.根据虚拟试验仿真系统中控制性能试验的要求,逐步建立控制律、永磁无刷直流电机、液压系统等各组成部分模型,并进行电机调速试验和液压系统参数整定.在MATLAB下建立完整的机电液复杂产品模型,为虚拟试验系统下一步的模型调用和协同开发提供了有力的支撑.仿真试验结论表明,该模型具备良好的各项控制性能指标,基本接近实际物理样机的工作情况.     

水下武器弹道流场数值仿真

建立水下武器发射管内部流场模型,利用Fluent软件的动网格技术对其流场进行数值计算,实现武器水下发射的内弹道仿真,为精确描述武器水下发射的管内过程提供了一种新的方法.     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.     

Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field

A new method was introduced to achieve directional growth of Sn crystals. Microstructures in liquid(Pb)/liquid(Sn) diffusion couples were investigated under various static magnetic fields. Results show that the β-Sn crystals mainly reveal an irregular dendritic morphology without or with a relatively low static magnetic field(B0.3 T). When the magnetic field is increased to 0.5 T, the β-Sn dendrites close to the final stage of growth begin to show some directional character. With a further increase in the magnetic field to a higher level(0.8–5 T), the β-Sn dendrites have an enhanced directional growth character, but the dendrites show a certain deflection. As the magnetic field is increased to 12 T, the directional growth of the β-Sn dendrites in the center of the couple is severely destroyed. The mechanism of the directional growth of the β-Sn crystals and the deflection of the β-Sn crystals with the application of static magnetic field was tentatively discussed.     

电化学噪声数据处理方法概述

综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。