10B28冷镦钢线材表面结疤成因分析及控制措施

采用金相显微镜和扫描电镜分析了10B28冷镦钢线材表面结疤,得出结疤缺陷形成的主要原因是钢中N含量偏高（0.013 3%）,钢中的Ti（0.033%）不足以完全固N,过剩N与B形成BN析出物,弱化晶界,形成微裂纹,导致铸坯表面开裂,最终经轧制后遗传到线材表面。通过将废钢比由21%降低为10%、降低出钢脱氧强度、造完白渣喂入钛铁线5 min后加入硼铁、控制LF软吹底吹气量和浇注过程铝损≤0.003%等措施,将N稳定控制在60×10^-6以下,保证Ti/N≥4,使表面结疤不良率由原来的60%降低至1.0%以下。     

Regional disparities in the spatial correlation of state income growth, 1977–2002

This paper presents new evidence of spatial correlation in USA state income growth. We extend the basic spatial econometric model used in the growth literature by allowing spatial correlation in state income growth to vary across geographic regions. We find positive spatial correlation in income growth rates across neighboring states, but that the strength of this spatial correlation varies considerably by region. Spatial correlation in income growth is highest for states located in the Northeast and the South. Our findings have policy implications both at the state and national level, and also suggest that growth models may benefit from incorporating more complex forms of spatial correlation. The views expressed here are those of the authors and not those of the Federal Reserve Bank of St Louis or the Federal Reserve System     

基于1-Wire安全器件的单片机加密认证系统

为防止单片机程序被非法复制,设计了一种基于1-Wire安全器件DS28E01-100的单片机加密认证系统,并阐述了加密认证系统的结构原理;分析了SHA-1安全散列算法、写密钥存储器数据、写存储器数据、质询响应认证等模块的单片机程序设计方法。实际应用表明,采用此加密认证系统,可有效防止单片机程序的非法复制。     

控压钻井技术在白28井的应用

控压钻井系统主要由钻井参数监测系统(包括井下PWD)、决策分析系统、电控系统、地面自动节流控制及回压补偿系统组成,通过在井口施加连续回压来实现井底压力的恒定控制,能有效解决窄密度窗口地层和高温高压地层所出现的钻井复杂问题。白28井的应用结果表明,使用控压钻井技术,在控压钻进工况下可将井口压力波动控制在0.2 MPa以内,控压停泵和起下钻工况下可将井口压力波动控制在0.5～0.8 MPa,井底压力波动控制在1.0～1.5 MPa,可保证井底压力当量密度在控制范围内;能够快速发现溢流和井漏等复杂情况并进行有效控制,确保了施工过程的安全,实现了钻井安全和勘探开发的目标。     

基于ENC28J60以太网接口的矿用监控分站设计

针对目前我国监控分站普遍使用现场总线与以太环网相结合方式实时性差的缺点,基于TCP/IP制定了完善的通信控制协议,采用ENC28J60网络接口芯片设计了分站接口控制电路,实现了监控主机与监控分站之间的数据收发控制.该分站采用定时计数、LCD液晶显示、ENC28J60网络接口和远程控制技术,实现了数据采集、液晶显示、数据处理、控制输出、声光报警和远程控制的功能.经过实验表明,上位机收到数据信息与监控分站采集信息一致,实现了网络的可靠通信.     

一种用于油水分离的新型旋流管的开发

设计了一种连续锥体结构的HL2 8型旋流管 ,其分离性能较相同公称直径的单锥体或双锥体结构的旋流管更好。实验结果表明 ,在HL2 8型旋流管流量为 1.6 9～ 1.73m3/h ,水相压力降为 0 .2MPa ,分流比为 1% ,处理用煤油配置的含油污水的油浓度不大于 15 30 6mg/L时 ,旋流管的分离效率为 6 5 %～ 99.7% ,出口水相油浓度为 9～ 6 1mg/L     

并行NOR Flash在SOPC开发中的应用

讨论Intel StrataFlash 3V Memory系列的JS28F128J3D-75并行NORFlash在基于Xilinx MicroBlaze的SOPC开发中的4种不同用途。J3DFlash可以用于存储FPGA配置比特流、可引导的软处理器代码、可直接执行的软处理器代码,以及非易失的数据或参数。本文给出了这4种用途的应用方法与技巧,指出了应该特别注意的技术细节,这些方法与技巧可以直接应用到SOPC项目开发中。     

Altera：28nmFPGA上的创新技术超越摩尔定律

Altera公司在即将推出的采用先进28nm工艺制程的FPGA中采用创新技术,集成嵌入式Hard Copy模块、部分重新配置新方法以及嵌入28Gbps收发器,这些创新技术大大超越了摩尔定律本     

苏里格苏10—28—33井沉积规律及测井相研究

苏10—28—33井在盒8段及山1段连续取心,总进尺达111.68m,通过仔细的岩心描述,获得了丰富的有关沉积地层方面的第一手资料,经过系统的理论分析,获得不少新的认识,如砂体的沉积地质特征、测井相规律等,为气田的下一步开发打下坚实基础。     

Millimeter‐wave antenna with wide‐scan angle radiation characteristics for MIMO applications

A three‐element quasi Yagi‐Uda antenna array with printed metamaterial surface generated from the array of uniplanar capacitively loaded loop (CLL) unit‐cells printed on the substrate operating in the band 25‐30 GHz is proposed. The metamaterial surface is configured to provide a high‐refractive index to tilt the electromagnetic (EM) beam from the two dipole antennas placed opposite to each other. The metamaterial region focuses the rays from the dipole antenna and hence increases the gain of the individual antennas by about 5 dBi. The antenna elements are printed on a 10 mil substrate with a center to center separation of about 0.5 λ ₀ at 28 GHz. The three‐element antenna covers 25‐30 GHz band with measured return loss of 10 dB and isolation greater than 15 dB between all the three ports. The measured gain of about 11 dBi is achieved for all the antenna elements. The three antenna elements radiate in three different directions and cover a radiation scan angle of 64°.