查询词典 radio-frequency spectrum

Both seismological theory and macroseismic observation show that the shape of strong motion response spectrum depends mainly on magnitude,distance of epicenter and engineering site condition.since it is considered just the effect of engineering site condition and epicenter distance of only site condition to determine the characteristic period of acceleration response spectrum in the antiseismic design criterion of our country at present,the characteristic period of response spectrum determined from those critetion is different from that got from special seismic hazard analysis.

地震学理论和强震观测都表明，强震反应谱的形状主要取决于震级、震中距和场地条件。由于我国现行的各种行业建筑物抗震设计规范中对标准加速度反应谱特征周期Tg作出的规定中一般只考虑场地和震中距的影响或只考虑场地影响，因此在某些情况下，由规范所得到的反应谱特征周期与由专门的地震危险性分析所得到的结果相差较大。

Adopting the model of uniform load and triangular load separately,MRFs of different story numbers and bay numbers are analyzed by static Pushover analytical method,and the global capacity envelopes are obtained.Then,through a method for establishing the inelastic demand spectrum of design intensity and rare intensity based on elastic spectrum of seismic design code for buildings,the structural target displacement of design intensity and rare intensity are estimated by improved capacity spectrum method.The corresponding structural ductility reduction factor,the overstrength factor,the structural influencing coefficient and displacement amplification factor are determined.

分别采用水平均匀分布力和倒三角分布力加载模式对不同层数和跨数的钢框架结构进行了静力推覆分析，并得到了结构的能力曲线，在此基础上，应用改进的能力谱法，以规范反应谱为基础建立设防烈度和罕遇烈度下的弹塑性需求谱，确定出结构在设防烈度和罕遇烈度下的目标位移，进而求解出结构的延性折减系数、超强系数、结构影响系数和位移放大系数等参数；同时，分析了不同加载模式、层数和跨数等对各系数的影响。

In the experimental process, changes in the samples were observed and photographically recorded using microscope, fluorescence spectrum, Raman spectrum and infrared absorption spectrum of the reacting systems were also determined in situ under high pressure.

为验证这一观点，本论文以金刚石压腔装置为手段，开展了地幔温压条件下(直到地球内部200km的深度)含碳物质与水反应生烃的模拟实验研究。

The trophoblast blood flow spectrum could be easily detected with the guide of CDE.The ultrasonic findings were characterized by broad arterial flow spectrum,high diastolic component of the low resistance trophoblastic flow,RI＝0.40～0.51 with single or biphasic spectrum.The salpingian ring with high blood flow indicated early and complete salpingian pregnancy.

结果：①异位妊娠包块血流信号丰富，血管连续性好，能较完整显示血管床、血管网及范围广的低流速血流信号；②脉冲多普勒取样为滋养层周围性血流频谱，其特征为：频谱增宽、单相或双相持续存在、阻力降低(RI＝0.44±0.04)、舒张期血流丰富的动脉频谱；③具有鲜明丰富的滋养层周围性彩色血流频谱特征的&输卵管环&是早期输卵管妊娠的特征性表现，并提示是输卵管完整存在的标志。

The phosphotungstic acid and the silicotungstic acid are prepared firstly, and the Keggin structure of them is also confirmed by IR spectrum. Then the HPWA/SiO2 and HSiWA/SiO2 are prepared by impregnation, and IR spectrum and UV spectrum are used to characterize the Keggin structure of them.

通过经典酸化－乙醚萃取法制备了钨磷酸和钨硅酸，并用红外光谱证明其具有Keggin结构；再用传统浸渍法对制备的钨磷酸和钨硅酸进行SiO2固载化，然后重点对杂多酸在固载化后Keggin结构是否依然保持进行了研究。

Raman spectrum and UV-vis-NIR absorption spectrum show that the above procedure does not change the electronic structures of single-walled carbon nanotubes. Moreover, the infrared spectrum confirms the formation of amide bond between ammonium sulfamate and carbon nanotubes.

Raman光谱和UV-vis-NIR吸收光谱表明，上述处理过程没有改变单壁碳纳米管的电子结构；此外，红外光谱的研究说明氨基磺酸铵与碳纳米管是通过酰胺键连接起来的。

Results A seven-line spectrum characteristic of 5, 5-dimethyl-2-pyrrolidone-N-oxyl was formed at first, at 60min the spin adducted DMPO-OH with four-line spectrum characteristic and at 120min, no spectrum was observed.

结果 酸性氧化电位水放置0和30min时EPR谱图信号是7条特征谱线组成的DMPOX的信号，60min后出现由4条谱线组成的DMPO-OH的EPR信号，120min则基本检测不到EPR信号。

The XeF laser spectrum is characterized by a continuous broadband spectrum and the absorption lines of atomic Xe can be observed in the spectrum.

选用合适的腔镜组合可实现XeF激光的窄带输出，带宽约为7 nm。

ABSTRACT The research of metal transfer in metal gas arc welding is of great significance for the control of arc welding process and quality, the improvement of existing welding technology and the development of new welding equipment. With the powerful aid of welding arc spectrum which contains plenty of information of metal droplet transfer, this dissertation, which mainly aims at putting forward an effective detecting method with arc spectrum signal, has inspected the spectrum of metal gas welding arc and discovered their dynamic characteristics of each kind droplet transfer mode.

熔化极气体保护焊熔滴过渡的研究，对于焊接过程及质量控制、焊接工艺方法的改进和新型焊接设备的推出都具有重要意义，而熔化极气体保护焊电弧光谱中含有丰富的反映熔滴过渡的信息。

The coordination compounds were characterized by infrared spectrum,X-ray diffraction spectrum and X-ray photoelectron spectrum.

用红外光谱、X-ray衍射和X射线光电子能谱等光谱分析手段对M-CTS进行了结构表征。

The use of the web to spread fears that flicking the switch on the LHC could create a Black Hole that could swallow up the Earth particularly concerned him, he said.

他说，使用互联网散布恐慌说启动LHC会生成一个可能吞噬地球的黑洞的做法让他感到忧虑。

Not a single word have I written down.

我一个字也没有写下来。