相位调频式DPSK通讯芯片的FPGA实现

介绍了相位调频式DPSK通讯原理,并利用VHDL语言设计了相位调频式DPSK基带数据收发器芯片.同时给出了该芯片的组成框图,利用QUARTUSⅡ4.2开发软件对核心模块进行了仿真.将设计信息下载于ALTERA公司的cycloneEP1C6T144C8 FPGA芯片中,进行了样机的实际测试.该芯片采用了现代的EDA技术,自顶向下的设计理念,具有FPGA/CPLD芯片的低功耗、抗干扰、宽带宽的特性,具有在系统编程的特点,因此在产品的研发、维护和后期升级上面,优于其它的专用ASIC通讯芯片.     

真空吸附式倒装芯片翻转机械手设计

针对芯片倒装封装中难以利用常规机构实现芯片翻转的问题,设计了一种回转型真空吸附式芯片翻转机械手,并与目前常用的气吸式芯片翻转机构比较,结果表明,该文设计的机械手具有更高的工作效率.     

3D打印多级互联结构的浓度梯度微流控芯片

传统微加工技术仅能制作二维的平面结构或者简单的三维结构,限制了其在高通量药物组合筛选的应用.采用光固化—喷印3D打印制造了具有多级互联的微通道网络分配器—4进口、36出口浓度梯度生成器.对芯片流道结构及布局进行了设计与计算,获得芯片的浓度分布;仿真分析微流道流体的混合效果,对不同芯片结构的浓度分布进行了实验表征,展示了该芯片具有高通量药物筛选的能力.多级互联的浓度梯度微流控芯片能够产生高通量浓度组合及多种分析物混合分配,在药物筛选、化学合成、趋向性研究、细胞凋亡等生物医学工程领域具有广阔的应用前景.     

基于深度学习的芯片位置检测系统

激光bar条是由多个芯片并排形成的激光器单条.工业生产中,需要在激光bar条上找到芯片的位置进行测试和加工.由于人工操作存在着精度低和效率低的缺点,现在一般采用基于传统机器视觉算法的芯片位置检测系统.传统机器视觉算法在芯片位置检测中过程复杂且不具有的通用性.近些年深度学习在机器视觉任务上大放异彩,所以我们开发了一套基于...     

集成电路芯片引脚外观自动检测系统的研究

基于集成电路芯片引脚外观检测的需要,开发了自动检测系统.介绍了系统的组成、硬件结构、软件流程.该系统由芯片自动输送线、芯片拾取吸臂、机器视觉系统、良品与不良品分选臂、良品补给装置等组成,由工控机通过PLC控制技术,实现芯片上料、输送、外观检测、分选、卸料等的全自动化.该系统可检测芯片引脚在空间的11个尺寸参数,具有检测精度高、产品更换快速、操作简便等优点,适用于QFP封装集成电路芯片引脚外观的自动检测,可显著提高生产效率及产品质量.     

智能测控终端到PC机的数据转存器

研制了一种具有USB接口和I2C总线接口的数据转存器,通过它可以方便地实现以单片机为核心的测控终端与PC机之间相互传递数据.存储器采用具有I2C总线的EEPROM芯片AT24C512作为数据存储芯片,利用USB总线转接芯片CH341A实现PC机读取EEPROM中数据的功能.文中介绍了CH341芯片、AT24C512芯片及I2C总线,设计了转存器的硬件结构,研制了转存器与测控终端和PC机通信的相关硬件及软件.     

传感器芯片系统研究与应用

基于微纳制造、微电子等技术的传感器芯片系统具有体积小、质量轻、功耗低、易于批量化生产、成本低、易于集成化等优点,是传感技术领域的一个重要研究方向.近年来相关的研究主要包括微纳传感器芯片、微传感器阵列、多传感器集成芯片系统、传感器与电路集成芯片系统、微流控芯片系统、无线网络传感器节点芯片系统等.文中分别以糖化血红蛋白免疫传感器、催化燃烧气体传感器和电场传感器为例,简要介绍若干典型的生物量、化学量和物理量微传感器系统及其应用.     

基于SOPC图像采集系统的设计

提出一种基于SOPC技术的图像采集系统的解决方案.该采集系统通过在单片FPGA上配置采集控制电路和USB2.0通信控制电路,可以实时传输外界图像数据.以图像传感器OV7660为图像采集芯片,EP2C8Q208 C8为主控芯片,USB2.0芯片CY7C68013为通信芯片,设计了一个图像采集与传输系统.该系统具有体积小、功耗低、设计灵活、可扩展性好等特点.     

WIA-PA系统级芯片设计与原型系统搭建

本文设计了一款基于ARM Cotex-M3内核,集成具有自主设计的WIA-PA无线通信模块、AES-128硬件加解密模块以及其他通用模块的WIA-PA工业无线系统级芯片WIASoC2400.对芯片进行流片与测试,结果表明,该芯片支持WIA-PA工业无线网络,接收灵敏度可达-l00dBm,具有更高的同步精度和更低的协议栈...     

一种可以实现快速检测的微振荡型PCR芯片

介绍了一种利用MEMS技术制作的微振荡型PCR芯片.与常规PCR产品相比,具有快速、微量和低耗等优点.设计了该芯片的工艺流程并进行了投片,通过实验成功验证了该器件的可行性.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.