查询词典 spectrum

Some results about the re-emission spectrum , the re-emission flux, the albedo and the equivalent temperature at the boundary are given, and the variations of re-emission spectrum with the incident flux are analyzed.

利用一维多群辐射输运程序，数值研究了平面Au靶入射流强度对再发射谱、再发射流、反照率及边界等效温度的影响。

Some results about the re-emission spectrum, the re-emission flux, the albedo and the equivalent temperature at the boundary are given, and the variations of re-emission spectrum with the incident flux are analyzed.

当入射流强度在（0.12-1.2）×1014Wcm2范围内，发射谱接近平衡谱，但在峰值附近谱形发生畸变。随着入射流强度降低，发射谱偏离平衡谱越来越大。分析表明，这与烧蚀深度和冕区光学厚度变小有关。

Some results about the re-emission spectrum,the re-emission flux,the albedoand the equivalent temperature at the boundary are given,and the variations ofre-emission spectrum with the incident flux are analyzed.

当入射流强度在(0.12-1.2)×1014Wcm2范围内，发射谱接近平衡谱，但在峰值附近谱形发生畸变。随着入射流强度降低，发射谱偏离平衡谱越来越大。分析表明，这与烧蚀深度和冕区光学厚度变小有关。还给出了在不同入射流强度情况下反照率及边界等效温度随时间变化规律和对吸收流及再发射流脉冲的分析。

Under an appropriate condition, the squeezed vacuum field can trap the two atoms inri.An analytical expression of emission spectrum for three-level atom interacted with two-mode cavity field is given. The effects of the initial state of system on the emission spectrum for three-level atom are explored.

我们给出了好腔中与双模腔场相互作用的三能级原子发射谱的一般表达式，探讨了系统初态对三能级原子发射谱的影响，阐明了只有原子和双模驱动场初始时刻均处于相干叠加态，原子不同跃迁通道间的量子干涉才使得原子发射谱呈现相位敏感性。

In the last new years , as the demands of wireless communication system grows rapidly , the bands of microwave frequency had been saturated with various communication applications . To achieve wider spectrum for high-speed and high-capacity transmission , bands of millimeter-wave frequency are the solution of this problem . The advantage of MMW wireless communication systems is wider bandwidth comparing with microwave communication systems . To utilize the spectrum efficiently , many methods of complexly digital modulation is proposed . The more complex modulation , the higher linearity is required , and more various phase of signals are required to accomplish process of modulation . Therefore high-linearity and quadrature-phase modulator and demodulator are the emphasis of this thesis . For high level of integration , high performance and low cost , this chip is fabricated by the complementary oxide semi-conductor 0.13um process . A compact size of direct down-conversion and direct up conversion circuits will be presented in this thesis .

近年来随著无线通讯产业的蓬勃发展，微波频带已经趋近於饱和，为了追求更宽的频谱来达到更快传输速率及高资料容量的传输，宽频的毫米波频段提供了解决此问题的途径，毫米波无线通讯系统提供了相对於微波通讯系统宽频的优点，且为了更有效的使用频谱，各种不同且复杂的数位调变方式及方法被发表出来，越复杂的调变方式其所需的线性度越高，且需要更多不同的相位讯号来完成调变的过程，因此高线性度及四相位的调变及解调器将是此篇论文的研究重点，为了达到高整合性，高效能，及低成本的电路设计，我门利用互补式金氧半导体制程来完成此电路设计，因此一小面积的直接降频(Direct down-conversion)及直接升频(direct up-conversion)电路将在文中介绍。

In overlay cognitive radio, secondary users harness unused spectrum bands for their transmission; in underlay cognitive radio, an ultra-wideband transmission with very low power spectrum density is employed by the secondary user to minimize harmful interference to the primary users.

认知无线电和动态频谱接入网络因此应运而生，成为近期无线通信和网络研究的热点。通常的认知无线电技术主要采用两种频谱接入方式：Overlay和Underlay。

The type-spectrum-chart of tow-row planetary gear train is plotted. Discussing the two examples in the type-spectrum-chart, two schemes of the five-shift transmission are obtained.

用约束矩阵形成挡位矩阵，分别针对型谱中一元联结和二元联结2种方式的结构型式实例进行传动分析，得到2种五挡双排行星齿轮变速机构的结构方案。

Through visible wavelength and the UV spectrum analysis, the transmittance is found declined as the mass transport and the cosolvent concentration increases and the cut-off wavelength tends to shift to long wavelength.The FTIR spectrum analysis shows that tin dioxide particulates and PMMA has no obvious surface bonding. Therefore, no new absorption peak is found and so do the change shown on the wave shape.

经由可见光及紫外光穿透光谱分析，发现其穿透率随质传温度及氯化锡/甲醇潜溶剂浓度增加而下降，且截止波长有往长波长移动的现象；经红外光光谱分析，析出的二氧化锡颗粒与PMMA并没有明显的界面键结，故并无新的吸收峰出现，波形改变不明显。

On the basis of the research on the loading spectrum and spindle speed spectrum of CNC lathes, the combined distribution principle of the torque of spindle and spindle speed of the CNC lathe is studied.

数据处理结果表明X轴进给传动系统载荷服从形状参数为1.699、尺度参数为7.596的伽玛分布；Z轴进给传动系统载荷服从形状参数为1.077、尺度参数为5.905的伽玛分布。

We learn that sodium or any of its compounds produces a spectrum having a bright yellow double line by noticing that there is no such line in the spectrum of light when sodium is not present, but that if the smallest quantity of sodium be thrown into the flame or other souces of light, the bight yellow line instantly appears.

当我们把很少的一点钠投入火焰或其它光源中时，我们会立刻看到光谱中出现一条鲜黄色的双线；当钠不存在时，光谱中的这条线也就消失了。由此我们知道，钠或任何钠的化合物所产生的光谱都带有一条鲜黄色的双线。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。