橘仁油的理化性质及成分分析

以市售橘仁为原料提取橘仁油．对橘仁油的理化性质和成分进行了分析，结果表明橘仁油主要由7种脂肪酸组成，其中棕榈酸、油酸、亚油酸含量分别为25．1％、25．4％、38．1％；通过测定橘仁油Sn-2位脂肪酸组成，确定了橘仁油脂肪酸的分布、使用GC／MS对橘仁油的不皂化物成分进行了分析，检测出10种主要物质，其中7-烯豆甾醇含量最高，占总量的78．8％．橘仁油中总磷脂含量为2．15％．VE含量甚微．     

SMAR公司现场总线控制系统System302的设计

通过对SMAR公司现场总线控制系统System302各设计环节的介绍和性能、特点分析，从经济投入和技术水平两方面说明现场总线控制系统是DCS系统的升级换代产品。     

汽轮发电机组轴封系统改造经验介绍

郑州新力电力有限公司200MW汽轮发电机组的轴封系统漏汽大,经常造成润滑油中带水、氢气湿度大现象,并且系统复杂,手动调整量大,在事故处理时调整繁琐,不利于事故处理,对机组的安全运行造成隐患。通过对轴封系统存在问题的原因进行分析,提出改进方案,并通过机组大修进行改造,系统改造后,相应改变系统的控制和调整方式,圆满地解决了轴封系统存在的问题,为机组的安全运行奠定了良好的基础。改造经验,可提供参考。     

中压配电网电压等级问题的探讨

在研究和分析我国现行中压配电网现状的基础上,探讨了关于改造和建设我国中压配电网问题,论证了建设20 kV配电网是现代中压配电网的发展趋势,采用20 kV电压等级是改造和建设我国中压配电网的最佳首选.同时,还提出了实施配电网改造和建设应当遵循的原则.     

论袁枚性灵说情感理论的自然主义偏向

袁枚性灵说情感理论突破了儒家传统情感理论的藩篱,特别是脱离了宋明以来的理学思想的桎梏,而走向了注重个体自然情感的抒发,对传统文学功利主义是一次有力的反拨.这种理论偏向原因颇为复杂.     

Simulation and Optimization of Amplitude-adjusting Performance of Crane with Virtual Prototyping Technology

In the design of crane, designers often have to study the trajectory of amplitude-adjusting of crane. The traditional methods, illustration and analytics both show their limits. In this paper, the simulation of process of amplitude-adjusting is presented and the optimization is also performed with virtual prototyping technology. From the comparison of original solution and optimal solution, the effectiveness of this technique is testified. On the platform ADAMS/View, the interactive optimization can be performed in a visual, intuitive and credible way, which deserves to be introduced to the design of crane.     

论现代企业薪酬福利制度的自助化趋势

对现代企业的自助式薪酬福利制度、整体薪酬回报和弹性福利制度进行了分析评价,并对我国企业实施此制度的可能性和发展前景进行了展望。     

增益增强型CMOS运算放大器的自动优化算法

在增益增强型运算放大器优化中采用了自动设计方法,此方法在电路性能方程式和自适应遗传优化算法基础上对电路性能指标进行优化。该放大器在0.18μm CM O S工艺条件下中开环增益为92.1 dB,单位增益带宽积为1.78 GH z,相位裕度为55.1°和0.2%建立时间为1.27 ns,同时说明此优化设计方法的有效性。     

4.9-GHz low-phase-noise transformer-based superharmonic-coupled GaInP/GaAs HBT QVCO

The low-phase-noise GaInP/GaAs heterojunction bipolar transistor (HBT) quadrature voltage controlled oscillator (QVCO) using transformer-based superharmonic coupling topology is demonstrated for the first time. The fully integrated QVCO at 4.87GHz has phase noise of -131dBc/Hz at 1-MHz offset frequency, output power of -4dBm and the figure of merit (FOM) -198dBc/Hz. The state-of-the-art phase noise FOM is attributed to the superior GaInP/GaAs HBT low-frequency device noise and the high quality transformer formed on the GaAs semi-insulating substrate.     

5.2/5.7-GHz 48-dB Image Rejection GaInP/GaAs HBT Weaver Down-Converter Using LO Frequency Quadrupler

A GaInP/GaAs heterojunction bipolar transistor (HBT) down-converter using the Weaver architecture is demonstrated in this paper. The Weaver system is a double-conversion image rejection heterodyne system which requires no bandpass filters in the signal path and no quadrature networks. The Weaver down-converter has the image rejection ratios of 48 dB and 44 dB when the RF frequency is 5.2 GHz and 5.7 GHz, respectively. A new frequency quadrupler is employed in the down-converter to generate the local oscillator (LO) signals. The frequency quadrupler is designed to minimize the phase error when generating LO signals and thus the image rejection performance is improved. A diagrammatic explanation using the complex mixing technique to analyze the image rejection mechanism of the Weaver architecture is developed in this paper. From our analysis, the image rejection can be further improved by making the LO₁ and LO₂ signals coherent