Rotary traveling-wave oscillator design using 0.18μm CMOS

正A rotary traveling-wave oscillator(RTWO) targeted at 5.8 GHz band operation is designed and fabricated using standard 0.18μm CMOS technology.Both simulation and measurement results are presented.The chip size including pads is 1.5×1.5 mm~2.The measured output power at a frequency of 5.285 GHz is 6.68 dBm,with a phase noise of-102 dBc/Hz at 1 MHz offset from the carrier.     

通信网络特别是光通信领域前沿技术的介绍

随着社会的不断进步、科技的不断更新换代,通信网络也得到了较快的发展,传统的通信网络已发展成为了互联网这一新型的、巨大的通信网络。在新型通信网络中,光通信占据着重要的位置。研究光通信领域前沿技术对于分析通信网络来说意义重大,本文就对通信网络中光通信领域前沿技术做一定的介绍和研究。     

某型导弹雷达微波信号发生器的设计与实现

介绍了针对某型导弹研制的宽频带、稳幅、大衰减输出、可实现自动测试的微波信号发生器。采用微控制器、闭环控制和脉冲调制放大等技术设计了宽带稳幅信号发生器;在PICC结构化高级语言平台上开发了一套具备自动匹配导弹测试流程的标准程序并设计了微波频率显示数据的加密算法。实验表明：该微波信号发生器动态范围大,测量误差小,保证了平坦的功率幅度特性,满足测试的特殊要求。     

面向对象建模在信息调运流程系统中的应用

在电网企业信息系统调度运行体系“十二五”规划大背景下,从项目建设实践出发,深入探讨流程系统的需求特征及其对技术平台的要求,综合分析面向对象建模方法在—单两票系统平台上的典型应用,如流程建模、流程模型与实例关系、权限建模等.面向对象建模方法在—单两票系统中的广泛应用,不仅帮助系统适应快速部署的要求,也让系统更好地适应快速...     

桐城风鸭产香真菌的筛选与鉴定

选用孟加拉红和马铃薯葡萄糖琼脂培养基筛选、分离桐城风鸭中产香真菌,经感官评价筛选得到1?株产香酵母Y1和1?株产香霉菌M3。采用顶空固相微萃取结合气相色谱-质谱法测定2株产香菌在马铃薯葡萄糖培养体系和模拟肉体系下的挥发性代谢风味产物。与对照组相比,产香酵母Y1出现1-戊醇和苯乙醇两个吸收峰,产香霉菌M3出现苯甲醛和γ-癸内酯两个吸收峰。经酵母26S?rDNA和霉菌ITS核苷酸序列鉴定,该株产香酵母Y1为涎沫假丝酵母（Candida zeylanoides）,而产香霉菌M3为烟管菌（Bjerkandera）。     

井下变频泵恒压供水系统设计应用

针对某矿采掘工程的延伸和水资源紧缺等问题,结合该矿供水系统及煤矿实际开采情况,设计了一种BPJ防爆变频器和PLC控制的变频调速恒压供水系统,简介了该矿井的用水情况及供水系统设备配置、供水系统的设计方案等具体内容,保障了矿井的正常用水,为煤矿的废水利用提供了新的思路。     

Significance of zircon trace element geochemistry,the Shihu gold deposit,western Hebei Province,North China

The Shihu gold deposit is characterized by gold-bearing quartz-polymetallic sulfides and quartz veins.Both Mapeng granitoids batholith and intermediate-basic dikes intruded the metamorphic basement rocks,and are spatially associated with gold mineralization.Trace element abundances in zircons from the Shihu gold deposit,determined by laser-ablation microprobe ICPMS analysis,are sensitive to source rock type and crystallization environment.Concentrations of 21 trace elements were determined for zircons from granitoid rocks,diorites,quartz diorite porphyrites and gold-bearing quartz veins revealed some elemental characteristics and chondrite-normalized trace element patterns from different samples.There were no distinctive differences in REE concentrations of zircons from plutonic rocks and quartz veins,indicating that they probably had the same origin.Relatively flat chondrite-normalized REE patterns with(Yb/Sm)N ratios less than 60 characterized zircons from quartz diorite porphyrites and quartz veins.The highest Nb/Ta ratios were found in zircons from quartz diorite porphyrites,whereas the lowest ratios were found in quartz vein zircons.The Nb/Ta ratios were broadly correlated with HREE+Y contents,and had weak positive correlations with the depth of the Eu negative anomalies.High values U up to 0.4% and Th up to 0.1%,as well as positive correlations with REE+Y characterized zircons from quartz vein.The lowest Th/U ratios of zircons present in quartz veins reflected the relatively high concentration of U in hydrothermal fluid,and high Pb concentrations only typified quartz vein grains relatively enriched in U and Th.Zircons from quartz diorite porphyrites showed the most pronounced Ce anomalies,whereas weak Ce anomalies were typical of zircons from quartz veins,in which Eu/Eu* of zircons had a broadly negative correlation with Ce/Ce*.Trace element geochemistry of zircons from mineralized quartz veins and plutonic rocks confirmed that the sources of ore-forming materials were from Precambrian host rocks.Our results significantly enhanced the usefulness of zircon in crustal studies of the North China craton and as an indicator mineral in mineral exploration of the Taihang region.     

关于有线行业部署下一代互联网的若干考虑

本文就有线电视行业部署下一代互联网的实施原则、实施的关键点、实施的安全保障措施等进行了论述。     

面向模型的动态架构

为了使应用系统能够动态调整以适应用户需求的变化,提出一种面向模型的动态应用架构。该架构以生成的框架对象实例来调度各应用构件的工作,在框架层解释模型与构件间的引用和交互过程。通过把用户业务需求这一抽象概念具体化为可直接操控的模型,给出一种面向模型的动态架构演化技术。设计并实现了一个支撑平台IPmis,为具有动态调整能力的应用系统的开发和运行提供了可视化的集成环境。在此平台上完成了医疗保险集成系统的开发,满足了随用户需求变更和动态调整的需要。     

开关电源电磁干扰的抑制措施

分析了开关电源产生电磁干扰的机理，就目前几种有效的开关电源电磁干扰措施进行了分析比较，并为开关电源电磁干扰的进一步研究提出参考建议。