单缸柴油机在高原环境下的功率研究

本文通过模拟高原环境下的进气压力,通过样机性能的测试,给出了对比曲线,供生产厂家出厂时参考。

基于概率密度拟合的风电功率波动特性研究

本文分别使用了正态分布、t location scale分布和logistic分布对风功率波动的概率密度进行拟合,并且通过t location scale分布分析了风电机组及风电场的概率数值特征。建立了基于欧式空间的波动信息丢失度量模型,分析了功率波动的平稳性和不同时间尺度下风功率波动信息的丢失率。通过数据分析,得出了随着时间尺度的增大,风电功率波动的相对可变性呈现上升的趋势,风电功率波动的时空分布具有一定的趋势性的结论。

不同低功率He:Ne激光对种植体骨结合影响的实验研究

目的:探讨不同低功率激光照射对种植体-骨结合界面骨形成的影响。方法:成年雄性Beagle犬6只,每侧胫骨植入4枚种植体,种植体随机编入A、B、C组实验组,D组对照组。实验组术后立即采用不同功率He:Ne激光垂直照射种植体对应体表,A组15mW、B组25mW、C组35mW,20min/次,1次/d,持续2周。术后1、2、3个月分别处死2只犬,处死前2周行四环素荧光双标记,制作带种植体的骨磨片,荧光正置显微镜下,计算双荧光标记率、矿化沉积率。Goldner’s三色法染色后测量种植体骨接触率。结果:骨组织形态计量学分析:术后1个月A、B组荧光标记率、矿化沉积率显著高于空白对照组及C组。A、B组间及空白对照组与C组间无显著差异。术后2、3个月荧光标记率、矿化沉积率各组间均无显著差异。组织形态学分析:种植体骨接触率术后1、2个月各组间无显著差异,术后3个月A、B组明显高于C、D组。结论:种植术后持续照射低功率He:Ne激光2周,15mW、25mW对术后早期(1个月)促进种植体周围成骨细胞增殖提高成骨细胞活性。

研究堆Mamdani型模糊控制器设计优化方法

Mamdani型模糊控制器的设计优化尚无系统、成熟的方法。本文针对应用于研究堆功率调节系统的Mamdani型模糊控制器,提出了两种设计优化方法,即非均匀分布输出隶属函数法和细化且非均匀分布隶属函数法,并在MATLAB/Simulink平台下分析了优化后模糊控制器的控制特性。结果表明:优化后模糊控制器的控制性能得到改善,且性能优于经典PID控制器。本文提出的两种设计优化方法是行之有效的Mamdani型模糊控制器优化方法。

Sugeno型二维模糊控制器设计及其优化研究

基于MATLAB/Simulink平台设计了某研究堆功率调节系统各环节模型,并设计了应用于该研究堆功率调节系统中的Sugeno型二维模糊控制器。仿真分析结果表明,Sugeno型二维模糊控制器可应用于该研究堆功率调节系统,且在超调量、调节时间等方面的性能优于经典PID控制器。本文提出了一种优化方法,优化后的模糊控制器性能得到改善,且性能(超调量、调节时间、振荡性能等方面)优于经典PID控制器。该优化方法是一种有效的模糊控制器优化方法。

中国工程物理研究院应用电子学研究所（摘要）

中国工程物理研究院应用电子学研究所创建于20世纪60年代末，现已形成电测技术研究及专用仪器研制、高功率脉冲技术研究、特种电真空器件研制、微电子技术研究、辐射效应与加固技术研究、计算机技术应用研究、无线电计量研究等多学科的科研体系。进入21世纪，

胡萝卜中天然β-胡萝卜素超声提取工艺的研究

采用L(934)正交试验,以β-胡萝卜素提取率为评价指标,用反相高效液相色谱法测定,研究了超声温度,超声功率,超声时间,超声频率对β-胡萝卜素超声提取的最佳工艺条件。试验表明:β-胡萝卜素标准曲线的回归方程为Y=1.27×107X-1.42×105,相关系数R=0.9994,最佳工艺条件为:超声温度55℃,超声功率50W,超声时间90min,超声频率100kHz。该法工艺简单、可靠、提取率高。

欧洲大型激光项目HiPER的现状分析

高功率激光能源研究(HiPER)项目由英国科研委员中心实验室理事会组织发起,是欧盟致力于以高能量激光驱动惯性约束聚变为基础,发展清洁聚变能源技术为目标的大型研究项目。其设计意图是发展激光驱动的惯性聚变技术,使欧洲在惯性聚变能的研究领域占据领先地位,同时借助HiPER激光装置所提供的极端实验条件,使其在极端物态科学研究领域具备其它国家没有的能力。目前它已由初期的泛欧项目发展成为一个全球聚变能科研合作的典范,其中有许多值得借鉴之处。作者从HiPER的研制背景、项目规划与管理、技术进展、对外合作等诸多方面进行了系统梳理,力图全面地反映出HiPER项目的整体进展情况。最后对HiPER项目进行了总结,这对从事激光装置及聚变能开发的科研人员可起到参考和借鉴作用。

Design of intrinsically safe power supply

Aiming to make a high power direct current supply safely used in coal mine production, this paper made a deep research on characteristics of intrinsically safe power supply, using the mathematical model established according to coal mine intrinsic safety standards. It provides theory support for the application of high power intrinsically safe power supply. The released energy of output short circuit of switch power supply, and the close related factors that influence the biggest output short-circuit spark discharge energy are the theoretical basis of the power supply. It is shown how to make a high power intrinsically safe power supply using the calculated values in the mathematical model, and take values from intrinsically safe requirements parameters scope, then this theoretical calculation value can be developed as the ultimate basis for research of the power supply. It gets the identification method of intrinsically safe from mathematics model of intrinsically safe power supply characteristics study, which solves the problem of theory and application of designing different power intrinsically safe power supply, and designs a kind of high power intrinsically safe power supply through this method. energy, flyback

Pioneering Proposal of Floating Type Ocean Wave Power Station

This serial research develops the unique ocean wave power station, which is composed of the floating type platform with a pair of the floats arranged at the interval of one wavelength and the counter-rotating type wave power unit whose runners are submerged in the seawater at the middle position of the platform. Such profiles make the flow velocity through the runners two times faster than that of the traditional fixed/caisson type OWC （oscillating water column）, that is, the runners may be able to get the dynamical energy eight times on the ideal. Besides, the runners counter-drive the inner and the outer armatures of the peculiar generator, respectively, and then the relative rotational speed is two times as fast as the speed of the single runner/armature. Such characteristics make the runner diameter large, namely the output higher, as you request, because the rotational moment of the power unit hardly act on the floating type platform. This paper, as the first step, discusses the platform behaviors at the normally oscillating wave. The platform behavior is affected by not only the length and the amplitude of the wave but also the relation between the weight of the platform and the buoyancy force of the floats.

Experimental Instrumentation for Measurement of Reactivity Temperature and Voiding Effects at Zero Power Research Reactors

The paper describes the instrumentation for studying temperature and void reactivity effects that were developed at VR-I zero power reactor. Further are described its operational parameters, fields and ways of its utilization as well as issues connected to its implementation into the reactor core.

Repacking practice for G-3 engineering driller power unit with drive shaft of dual channel reverse circulation

In order to satisfy operating requirements for constant core drilling technology in reverse circulation with hollow-through DTH,the power unit of G-3 engineering driller was ameliorated. The new one with dual channel drive shaft, achieved the perfect assemble with transmission structure of the original power unit. It could interconvert according to need by using two sets of drive shafts with direct and reverse circulation. The repacked G-3 engineering driller carried on experiment in the field test in Luanchuan molybdenum mine of Henan, whose effect was very good.

Physical activity,fitness and all-cause mortality:An 18-year follow-up among old people

Background：Little is known about change in physical activity（PA） and its relationship to all-cause mortality among old people.There is even less information about the association between PA,fitness and all-cause mortality among people aged 80 years and above.The objective is to investigate persistence and change in PA over 5 years as a predictor of all-cause mortality,and fitnes as a mediator of this association,among people aged 80 and 85 years at the beginning of an 18-year mortality follow-up period.Methods：Using Evergreen Project data（started in 1989）,4 study groups were formed according to self-reported changes in PA level,over a 5-year period（starting in 1989–1990 and ending in 1994–1995）：remained active（RA,control group）,changed to inactive（CI）,remained inactive（RI）,and changed to active（CA）.Mortality was followed up over the 18-year period（1994–2012）.Cox models with different covariates such as age,sex,use of alcohol,smoking,chronic diseases,and a 10 m walking test were used to analyze the association between change in PA level and mortality.Results：Compared to RA,those who decreased their PA level（CI） between baseline and follow-up had higher all-cause mortality（hazard ratio（HR=2.09;95%CI：1.63–2.69） when adjusted for age,gender,and chronic diseases.RI showed the highest all-cause mortality（HR = 2.16;95%CI：1.59–2.93）.In CA,when compared against RA,the risk of all-cause mortality was not statistically significan（HR=1.51;95%CI：0.95–2.38）.In comparison with RA,when walking speed over 10 m was added as a covariate,all-cause mortality risk was almost statistically significan only in CI（HR=1.37;95%CI：1.00–1.87）.Conclusion：Persistence and change in PA level was associated with mortality.This association was largely explained by fitnes status.Randomized controlled studies are needed to test whether maintaining or increasing PA level could lengthen the life of old people.

Fundamental Study of High Step-down Non-isolated Multicellular DC-DC Converter for Future DC Distribution Systems

A novel high step-down non-isolated DC-DC converter has been proposed. The proposed converter consists of highly efficient non-isolated cell converters using bidirectional semiconductor power devices, and these cell converters are connected in ISOP （input series and output parallel）. The non-isolated ISOP converter achieves high step-down ratio of D/N, operating N cell converters under the duty ratio olD. Availability of the proposed converter has been shown by developing the 48 V-12 V laboratory prototype using two 24 V-12 V cell converters. Design consideration for the 48 V-3 V multicellular converter using four 12 V-3 V cell converters has been also conducted, and the potential to approach the efficiency of 97% has been discussed. The proposed topology is suitable for the POL （point of load） converters in the highly efficient next generation DC distribution system for data centers.

U形峡谷桥址区风特性实测研究

山区桥梁桥址区风场特性相比平原地区更加复杂,具有强烈的地形效应。针对某U形峡谷中三塔斜拉桥的中塔建立了高度方向的多个测点,测得了不同高度处的风速时程,通过统计分析得到桥位的平均风参数和脉动风参数及其统计规律。分析结果表明,该峡谷桥址区的平均风速剖面受地形影响大而且形式复杂,风攻角比规范推荐值大,顺、横、竖风向的湍流度比值与规范值的差异明显,湍流积分尺度、脉动风功率谱与规范相比也有所区别。

欧洲HiPER项目激光驱动器概念设计研究现状

惯性聚变能源是公认的安全、无碳、可持续发展的洁净能源。简要介绍了欧洲高功率激光能源研究(Hi PER)项目激光驱动器的基准设计,然后从放大器的构型、热管理技术和放大的自发辐射抑制技术、激光系统的光束结构等方面重点讲述了满足Hi PER项目的两种千焦耳级激光链路方案。最后介绍了Hi PER项目实现商用激光聚变能源电站的发展规划。

新药的发展趋势

近年来,全球医药产业规模虽不断扩大,但增速明显放缓。全球市场新药上市数目趋于下行,新药市场占有率每况愈下,加之专利药物集中过期,未来全球新药市场将向哪里发展?该文从新药研发成功率、欧美新药审批情况等多方面对新药发展情况进行了剖析,并对未来新药发展方向进行了预测。

Study and development of high peak power short pulse Nd:YAG laser for peening applications

Because short pulse Nd:YAG laser of nanosecond pulse-width and high peak power has a unique capability to improve the mechanical properties of metal parts,a study on the development of high peak power short pulse from Nd:YAG laser along with its peening application has been performed.The design scheme of laser and the characteristic of laser beam transmission are presented and discussed.A pulse energy of 25 J with 15 ns pulse-width and a maximum peak power of 1660 k W laser system which use one oscillation and eight amplifiers has been achieved.Laser beam has a max divergence angle of 0.03 mrad,a pulse-to-pulse pulse-width stability of±0.1 ns,and the pulse-to-pulse energy stability factors of less than±2.8%.A low value of divergence means an easier modification of a nearly hat-top laser beam intensity profile and an easier transmission of laser beam.To evaluate the performance of the laser system,several metal materials are processed.Laser peening quality and efficiency are analyzed by using an optical microscope,a transmission electron microscope,and an X-ray diffraction device.The processing results show that the performance of this laser system is excellent.

Optical scheme for realization of optimal unambiguous state discrimination of the JS limit

We exploit optimal probabilistic cloning to rederive the JS limit.Dependent on the formulation given by the optimal probabilistic cloning,the explicit transformation of a measure of the JS limit is presented.Based on linear optical devices,we propose an experimentally feasible scheme to implement the JS limit measure of a general pair of two nonorthogonal quantum states.The success probability of the proposed scheme is unity.