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浏览/检索结果: 共6条，第1-6条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 单器件时钟负载限制竞争RAM锁存器设计 期刊论文 北京大学学报 自然科学版, 2014 贾嵩; 刘黎; 李涛; 李夏禹; 王源; 张钢刚 收藏  |  浏览/下载：2/0  |  提交时间：2015/10/23 RAM型锁存器  高速低功耗  低时钟负载  竞争约束  RAM-type latch  high-speed and low-power  low clock load  contention constrain   Effect of Process Parameters on Die Wear Behavior of Aluminum Alloy Rod Extrusion 期刊论文 Materials and Manufacturing Processes, 2013, 期号: 1, 页码: 312-318 作者:  Tingting Li;  Guoqun Zhao;  Cunsheng Zhang 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/23 Die wear depth  Ram speed  Subroutine  Wear theory   Effect of Process Parameters on Die Wear Behavior of Aluminum Alloy Rod Extrusion 期刊论文 MATERIALS AND MANUFACTURING PROCESSES, 2013, 卷号: 28, 期号: 3, 页码: 312-318 作者:  Li, Tingting;  Zhao, Guoqun;  Zhang, Cunsheng;  Guan, Yanjin;  Sun, Xuemei 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/23 Die wear depth  Ram speed  Subroutine  Wear theory   Study of temperature evolution and metal flow of 6005A aluminum alloy during indirect extrusion 会议论文 Nanchang, China, June 20, 2011 - June 22, 2011 作者:  Qiao, Jisen;  Li, Fi;  Xia, Tiandong 收藏  |  浏览/下载：1/0  |  提交时间：2020/11/15 Aluminum  Aluminum alloys  Computer simulation  Extrusion dies  Finite element method  Industrial engineering  Manufacture  Metal extrusion  Metals  Strain rate  Dead metal zone  Extrusion parameter  Extrusion process  Finite element modeling  Indirect extrusion  Metal flow  Model validation  Numerical models  Peak load  Ram speed  Temperature evolution  Temperature increase  Total force   FE simulation of extrusion to produce a thin-walled wide profile through a spreading pocket die 期刊论文 2010, 2010 Fang, G.; Zhou, J.; Duszczyk, J.; Wu, X.K. 收藏  |  浏览/下载：4/0 Storage and compression design of high speed CCD (EI CONFERENCE) 会议论文 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China Cai X.; Zhai L. P. 收藏  |  浏览/下载：45/0  |  提交时间：2013/03/25 In current field of CCD measurement  large area and high resolution CCD is used to obtain big measurement image  so that  speed and capacity of CCD requires high performance of later storage and process system. The paper discusses how to use SCSI hard disk to construct storage system and use DSPs and FPGA to realize image compression. As for storage subsystem  Because CCD is divided into multiplex output  SCSI array is used in RAID0 way. The storage system is composed of high speed buffer  DMA controller  control MCU  SCSI protocol controller and SCSI hard disk. As for compression subsystem  according to requirement of communication and monitor system  the output is fixed resolution image and analog PAL signal. The compression means is JPEG2000 standard  in which  9/7 wavelets in lifting format is used. 2 DSPs and FPGA are used to compose parallel compression system. The system is composed of FPGA pre-processing module  DSP compression module  video decoder module  data buffer module and communication module. Firstly  discrete wavelet transform and quantization is realized in FPGA. Secondly  entropy coding and stream adaption is realized in DSPs. Last  analog PAL signal is output by Video decoder. Data buffer is realized in synchronous dual-port RAM and state of subsystem is transfer to controller. Through subjective and objective evaluation  the storage and compression system satisfies the requirement of system. 2009 SPIE.