查询词典 spectrum

An about 18-day test run has been finished and the veto efficiency of CsI crystal anti-Compton detector is about 31% and the event rate of background spectrum of HPGe detector is about 133cpd.

实验数据表明，CsI晶体探测器的反符合效率约为31％，HPGe探测器的本底计数率水平约为 133cpd。

The malfunction places include X-ray generation device, vacuum of sample and spectrum chamber, detector, crystal and goniometer.

应晓浒，张卫星，陈晓东。波长色散X射线荧光光谱仪的性能测试方法介绍。光谱实验室，2000，17(3)：

Under the condition of the borehole and sandstone formation filling with oil and water, respectively, the ability is different when different energy windows are selected to distinguish formation by simulating the detector response spectrum of various diameters and length of NaI and BGO crystal. The C/O value difference of BGO crystal is higher than that of NaI crystal when the energy window includes photoelectric peak, the first and the second escape peaks, but it is less affected by the different sizes of detector crystal. Using photoelectric peak corresponding to the energy window, the C/O value difference of BGO crystal detector is much larger than that of NaI, but it increases with the crystal size increasing. The C/O value is greatly affected by energy drifting, while relatively a little by energy resolution.

对于井眼和地层流体分别为油和水砂岩地层，模拟改变NaI和BGO晶体探测器的直径和长度时的非弹性散射γ射线响应能谱，采用不同能窗处理方法对地层流体的分辨能力不同，选取光电峰和第一、第二逃逸峰对应的能量窗时，BGO晶体探测器比NaI晶体探测器测量的C/O差值大，但受尺寸的影响不大；采用光电峰对应的能量窗时，BGO晶体探测器测量的C/O差值比NaI的大得多，且随尺寸的增加差值增大；能量道的漂移对C/O值影响较大，而能量分辨率对差值影响相对较小。

In the end of the paper, simulating the different energy gamma photons response through the nude NaI crystal detector and getting the response in 137Cs window from the different kinds of radionuclide, such as the response of 238U、 232Th、 40K and 137Cs itself in 137Cs window, getting the response in NaI multi-channel gamma spectrum from different nuclides.

本论文是利用蒙特卡罗方法模拟伽玛光子在NaI多道伽玛能谱响应，本论文介绍了蒙特卡罗方法以及该方法在核物理的应用，介绍了蒙特卡罗方法在计算机中的实现以及一种应用软件—MCNP—4B，最后具体模拟不同能量的伽玛光子在裸晶体NaI中的响应，得到NaI多道伽玛能数据中~(137)Cs窗中天然放射性核素，如~(238)U、~(232)Th、~(40)K，以及~(137)Cs本身在~(137)Cs窗中的响应，得出~(238)U、~(232)Th、~(40)K、~(137)Cs的响应函数。

The complexes were characterized by elemental analysis, IR spectrum, and single crystal X-ray diffraction.

通过元素分析、红外光谱和X射线单晶衍射方法对配合物进行了表征。

It has been applied to the determination of Cd2+ in mixed samples and environmental water with satisfactory results. 2.Resonance light scattering spectrum of zinc-thiocyanate- crystal violet system has been studied.

研究了锌-硫氰酸盐-结晶紫体系的共振光散射光谱，考查了其光谱特征、影响因素和适宜的反应条件。

The anthocyanin HPLC fingerprint of wines from the grape varieties, the fingerprint of anthocyanin HPLC and volatility component GC-MS of the wine vintages, the fingerprint of the infrared spectrum and multivariate parameter of the wine production regions were established in this dissertation. wine Fingerprints were analyzed by using identification pattern methods, and the internal regular rule and crytic character of wine fingerprint were explained,identification pattern and methodology system of the main aspects of wine quality were established in this dissertation.

本文建立了不同酿造品种葡萄酒HPLC花青素指纹图谱、不同酒龄葡萄酒HPLC花青素指纹图谱和GC–MS挥发性成分指纹图谱、不同产地葡萄酒红外光谱指纹图谱和多元参数指纹图谱，应用相似度分析、主成分分析和聚类分析识别方法，对本文所建立的指纹图谱进行了分析，揭示了指纹图谱的内部规律和隐含性质，建立了适合的识别模式及葡萄酒质量指纹图谱检测体系。

Two present methods are introduced which are adaptive line enhancer and 1— spectrum methodusing high order cumulant.

介绍了两种现有的方法：自适应线谱增强器和利用高阶累积量信息的1 1/2谱法。

Analysis on the cumulative distribution of probability in capacity for IDMA-OFDM system is performed, and a close representation on system spectrum efficiency of IDMA-OFDM system is obtained, under the assumption of large system regime, when many receive antennas are used.

分析了IDMA—OFDM系统的容量的累积概率分布，在接收天线较多的情况下，以大系统机制假设为前提，推导出一个闭合的IDMA—OFDM系统频谱效率的表达式。

The leakage current increases and some change in the amplitude and frequency spectrum of leakage current pulse signal occurs.

所采集的漏电脉冲信号幅度和频谱均发生了明显的变化。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。