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     A novel SOI LDMOS structure with step thickness drift region is proposed, in this structure the drift region is divided into different parts with thickness increasing from source to drain, electric field distribution is improved due to modulation effect of step drift region, and therefore the breakdown voltage is increased.
     本文提出了一种阶梯厚度漂移区SOI LDMOS新结构,此结构将漂移区分成厚度由源到漏依次增加不同的区域,利用阶梯型漂移区对电场的调制作用改善电场分布,从而提高器件击穿电压。
     This paper provides a conceptual model for different format data sources,defines a set of rules from information source to conceptual model.
     论文为不同格式的数据源提供了一个统一的概念模型,并定义了各种信息源到概念模型的转换规则。
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     Seven different-activity cobalt sticks with 28878 couriers had been added to 60Co irradiation facilities. Accuracy measurement cobalt source to irradiation position repeatability was 0.14%<1%.
     为使60Co辐照装置增加总活度为28878居里(1.07PBq)由7根活度不同的进口源棒的增源顺利启用,通过测定源到辐照位置的重复性为0.14%<1%,符合标准。
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     Data dissemination from data source to data sinks is one important function of wireless sensor network.
     从数据源到数据接收者的数据分发是无线传感器网络的重要功能.
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     It is the important characteristic of SAS data warehouse technology that the operation of integrated type formed a coherent whole from the data source to the data warehouse .
     从数据源到数据仓库一气呵成的集成式的操作,这是SAS数据仓库技术的重要特点。
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     We calculated the eigen-efficiency of domestic cylindrical NaI(T1) crystals of 4cm×4cm,5cm×5cm,10cm×10cm,in the energy range of 0. 05~10MeV, and the source distance range of 0~10cm.
     作者计算了国产4cm×4cm,5cm×5cm,10cm×10cm的圆柱形NaI(T1)晶体的本征效率。 能量范围是0.05~10MeV,源到晶体的距离的范围是0~50cm。
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     The matching and coupling of the Microwave between the source and regeneration cavity are chiefly solved.
     重点解决了微波源到再生腔的微波匹配与耦合问题,以及车用微波电源的设计和控制。
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     The irradiation position reproducibility of cobalt source, the dose rate distribution in γ field and the dose uniformity ratio in product box were measured with Ag 2Cr 2O 7 dosemeter before supplement 1 85 PBq 60 Co irradiation chamber was in commission.
     在60Co辐照室增源185PBq后,启用前用Ag2Cr2O7剂量计准确测量了源到辐照位置的重复性和辐照场的剂量率分布,以及辐照产品中吸收剂量的不均匀度。
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     Relative Comparison Transfering Method of the Ge Spectrometer Efficiency of Volume Source from Point Source
     HPGe γ 谱仪点源到体源效率的相对比较传递方法
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     The process of data mining based on XML is discussed, which argues that all parts of data mining deal with XML based data stream.
     对基于XML的数据挖掘基本过程进行了探讨研究,提出了在数据挖掘过程中,从数据源到发现知识全过程都基于XML进行描述处理的方法与过程。
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     Z-Source Converter
     Z变换器
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     meleagridis from quail,and the ostrich(can′t) be infected by this C.
     鹌鹑C.
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The contribution of each source to the formation of definitive hemopoietic tissue was analyzed.
      
The effect of the governing parameters, such as the distance from the source to the cone, the specific heat ratio, the cone angle, and the angle of attack, on the flow is studied.
      
An anomalous displacement of the equivalent dipole source to a region far downstream of the cylinder is found using the method of azimuthal decomposition of the sound field.
      
Heat Transfer from a Local Heat Source to Subcooled Liquid Film
      
An experimental investigation is performed of heat transfer from a local heat source to films of water and low-boiling dielectric liquid that flow down a vertical plate by gravity.
      
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The sound velocity in a fibre shows a pronounced anisotropy, that is, the sound velocity along the axis of an oriented fibre is much greater than that perpendicular to it, and therefore it may be used as a measure of the molecular orientation α in the fibre,α= 1 - Cα2/C2where C and Cu are velocities of sound along an oriented fibre and a completely un-oriented fibre respectively.The apparatus used consisted of a pulse generator which sends a pulse of 70 μsec duration with a repetition frequency of 100 times...

The sound velocity in a fibre shows a pronounced anisotropy, that is, the sound velocity along the axis of an oriented fibre is much greater than that perpendicular to it, and therefore it may be used as a measure of the molecular orientation α in the fibre,α= 1 - Cα2/C2where C and Cu are velocities of sound along an oriented fibre and a completely un-oriented fibre respectively.The apparatus used consisted of a pulse generator which sends a pulse of 70 μsec duration with a repetition frequency of 100 times per second to the moving coil of a loud speaker. The fibre was coupled to the vibrating membrane through a spring clamp. When exited by the pulse, the system underwent damped oscillation with a natural frequency of about 4000 Hz. At the other end of the fibre, about 200 cm from the clamp, a crystal pick-up was located, the output of which was sent to an oscilloscope with the sweep circuit triggered by the pulse voltage. The time of propagation of the longitudinal vibration along the fibre from the clamp to the pick-up was observed from the oscilloscope record, and the sound velocity in the fibre calculated.Since the mechanical properties of fibre depend considerably on the moisture regain and tension, the effect of relative humidity and tension in the fibre on the sound velocity were studied.The best choice of the experimental conditions for the determination of molecular orientation by the sound velocity method appears to be the following: room temperature, 28 - 30℃; relative humidity, 60%; and under a tension somewhat below the critical Young's modulus of the fibre.The sound velocities in the fibres of different draw ratios (r) were determined and extrapolated to r = 1 to give the value for Cu. Experimental results indicate that the degree of molecular orientation of monofils of Nylon 6 increases to approximately 80% after drawing and after-treatment.The degree of orientation for several products of Nylon 6 fibre such as yarns, monofils, and cords was determined. Fibres that possess greater breaking length show higher degree of orientation.

纤维具有声学的各向异性,声波通过纤维的速度与纤维中高分子链的取向程度有关。测定声波沿纤维轴方向的传播速度可以计算纤维的取向度α: α=1-C~2_u/C~2其中C及C_u分别为声波通过取向及无规取向纤维的速度。 实验仪器采用每秒100次的脉冲电流输至高音喇叭的音圈,纤维通过弹簧夹子与喇叭振膜的中心相耦合。脉冲电流激发喇叭振膜振动系统,使产生逐渐衰减的固有频率振动(约4000赫)。离振源200厘米处的纤维另一端有拾音器,其输出讯号接至由脉冲电压触发扫描的脉冲示波器,从示波器可以观察到从振源到拾音器的距离间声波在纤维中的传播时间,由此计算出声波通过纤维的速度。 纤维的吸湿性与所受张力不同对其力学性貭均有影响,因此研究了相对湿度与张力对纤维中声速的影响,并选择了在室温(约30℃),相对湿度为60%和在小于纤维的临界杨氏模量的作用张力下进行声速法测定纤维的取向度。 研究了不同拉伸程度单纤维样品的声波传播速度,并外推到长度拉伸比为1时作为声波通过无规取向纤维的速度。实验结果表明,尼龙6纤维的取向度经拉伸与后处理逐渐增大至80%左右。 测定了不同品种的尼龙6纤维的取向度,具有较大强度的纤维其取向度较大。

It is known (from another paper) (6)that a rotating macroscopic mass-system will radiate the gravitational waves of its geometric shape is unsymmetric.The dominace of this intrinsic unsymmetry over the power of gravitational radiation is indicated by its equatorial ellipticity ∈e.Furthermore, in this paper we have shown that a rotating source of gravitational radiation can make its axis of rotation to precess as long as its shape and its surroundings are unsymmetric. As a result, the observer on earth would...

It is known (from another paper) (6)that a rotating macroscopic mass-system will radiate the gravitational waves of its geometric shape is unsymmetric.The dominace of this intrinsic unsymmetry over the power of gravitational radiation is indicated by its equatorial ellipticity ∈e.Furthermore, in this paper we have shown that a rotating source of gravitational radiation can make its axis of rotation to precess as long as its shape and its surroundings are unsymmetric. As a result, the observer on earth would see a periodic radiation. For example, in respect to a rotating celestial body of homogeneous mass which is inside galactic nucleus and in shape of Jacobi ellipsoids (a≥b>c),of which axis of rotation is not inertial axis, we would see a periodic radiation of gravitational waves with the reappearing period,

从以前研究知道,对于一个旋转的宏观质量系统,它的几何形状表征的内部不对称性将引起引力辐射。这种内部不对称性对辐射强度的影响可由其赤道椭率∈_e描述。据此,本文进一步指出,旋转的引力辐射源又将由它的形状和外部空间不对称而产生进动。它对地球上观察者来说,见到的引力辐射将是周期性地出现。以银核内某个均匀质量的旋转Jacobi椭球(a≥b>c)源为例,给出的再现周期为:T_(re)=t_o ρ_(star)(a~2+b~2+2c~2)c/l其中,ρ_(star)为源的质量密度,l是星体源到银核中心的距离。t_o在CGS单位制下t_o≈4.8×10~(10)秒·厘米/克。最后,并应用上式于银核内出现Weber辐射源的各种可能天体作了简单的分析和讨论。

The depth dose distributions and uniformity of beta radiation fields from anatural uranium slab in equilibration were measured using a tissue equivalentextrapolation chamber and film dosimeter. The chief advantages for calibration ofenviromental dose instrument or survey meter and personal dosimeter, for routinemonitoring in terms of directional dose equivalent and superficial individual doseequivalent were summarized. Finally, the values measured agree well with that oftheoretical calculation.

本文总结了天然铀(+子体)块作为β射线外照射吸收剂量刻度用参考标准源的7个优点。用组织等效外推电离室测量了天然铀照射聚乙烯材料时的深部剂量分布。用裸露胶片测量了源中心轴上空气中浅表吸收剂量随源到探测器距离的变化,以及不同距离处垂直于中心轴的平面上剂量场的均匀性。指出了按照ICRU第39号报告提出的定向剂量当量H’(0.007)和浅表个人剂量当量H_?(0.007),用这种源刻度环境或工作场所监测仪表和个人剂量计时应注意的问题。最后把测量值与根据天然铀及其主要子体的复杂能谱进行的初步理论估算值进行了比较,符合较好。

 
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