查询词典 X ray

To make paper more systematic and practical, this paper has first introduced the development history of CT equipment, then, elaborate construction of system and theworking principle of CT equipment systematically, including the property of X-ray, the absorption law of X-ray for materials, the reconstruction principle of CT image, the structure of software and hardware for CT equipment. Finally, with 2 CT systems that we used, statistic and analysis of all the malfunctions which have carried out in passed 10 years was given, and according to the systematic parts of fault located, classify the malfunctions, then elaborate their working principle one by one, analyze the regularity and the characteristic of each malfunction, and put forward specific prevention method and measure for the malfunction.

为了使论文更具系统性和实用性，本论文首先介绍了CT设备的发展史，然后比较系统地阐述CT设备的工作原理及系统结构，包括X射线的特性和物质对x射线的吸收规律，CT图像的重建原理，CT设备的软、硬件结构等，最后以我们所使用的2台CT为例，对10余年来所出现的故障进行了全面的统计分析，并按故障所处的系统部件进行分类，然后逐个阐述其工作原理，分析其故障的特点和规律，并就这些故障提出具体的预防方法和措施。

Department of Scientific History and Archaeometry; Graduate University of Chinese Academy of Sciences; Beijing 100049;4.Institute of Archaeology; Chinese Academy of Social Sciences; Beijing 100710; China;The fabrication technologies in terms of phase composition,structure,firing temperature,porosity,density and water permeability of ceramic water pipes and contrastive ceramic tilesexcavated from Anyang Yin Ruins of Shang dynasty were studied by X-ray fluorescence,X-ray diffraction and dilatometer,respectively.It was found that the contents of CaO,K2O,MgO and P2O5 in CWP were relatively higher than those in contrastive CT.The difference was further confirmed by the mass ratio of flux...

采用X射线荧光、X射线衍射、热膨胀等分析手段对比研究了安阳商代陶水管的制作工艺，发现陶水管化学成分中各类熔剂的质量分数均略高于对比陶片中熔剂的质量分数，CaO、K2O、MgO等助熔剂与A l2O3的质量比进一步证实该现象，而这种差异性则外在地表现为陶水管的气孔度低于对比陶片以及陶水管热膨胀曲线中出现玻璃化现象，该结果表明陶水管原料应为一种易熔粘土，或者在沉淀粘土中人为地掺和了草木灰类掺和料，这有利于陶水管烧制与成型，有助于熔剂在熔融状态下，较好地进入陶水管中的空隙，使陶水管变得更加致密，一定程度上有利于防止陶水管的渗水，显示出陶水管制作工艺的特殊性。

Based on our reduction of the ASCA observational data and fittings of the low and medium energy X-ray spectra, we combine the ASCA and BeppoSAX observed PG QSOs to form a sample for statistics of the spectral features on the X-ray spectra.

从处理ASCA观测数据和分析X射线谱出发，将有ASCA和BeppoSAX观测结果的PG类星体构成一个样本，对它们的中、低能X射线谱上的观测特征进行统计。

For purpose of calculating the bare wire and shielded wire responses in X-ray environment,Holland thin wire model and TL model were used respectively. The effect of wire load,radius,X-ray energy and medium layer thickness on the responses were discussed based on the results of test.

针对裸线和带保护层导线两种不同的物理结构，分别应用Holland细线模型和时域传输线模型，结合实验结论，计算了负载大小、导线半径、X射线能量以及保护层厚度等对导线X射线瞬态响应的影响。

X-ray data from NASA's Chandra X-ray Observatory reveals point-like sources that are black holes and neutron stars in binary star systems.

来自NASA的钱得拉X射线天文台的X射线的数据显示出黑洞和中子星这个双星系统的起源要点。

Methods:9 patients including 8 male and 1 female were included in this study.2 patients suffered from both side of ANFH,5 were righe side and 2 were left side.X-ray,CT and MRI were performed before the surgery.4 hips were classified as ARCO stage 1,7 hips were stage 2.All the patients were treated as follows:the area of NFH and cystis degeneration were detected and bouche decompression was done through X-ray with C-arm,and the necrotic bone was cleared for the pathologic diagnosis under the monitoring of arthroscopy.And then the non-cell based tissue engineering bone, which was the complex of autologous red bone marrow and osteoinductice absorbing material containing BMP,was transplanted into the body.

本组9例，男性8例，女性1例；双侧股骨头坏死2例，右单侧股骨头坏死5例，左单侧股骨头坏死2例；术前均行X线摄片、CT、MRI 检查，ARCO分期：Ⅰ期4髋，Ⅱ期7髋；C型臂X线透视下行股骨头坏死区和囊性变区定位、髓芯减压，关节镜监视下，刮除坏死骨送病理；植入由自体红骨髓与含BMP的骨诱导活性材料复合成的非细胞型组织工程骨，并用空心钛钉支撑股骨头软骨下骨质。

By setting different kinds of filters of various thickness values before the pinholes of camera and using the spectral sensitivity of the camera,multi-frame X-ray images of wire arrays Z-pinch implosions in different energy ranges were obtained. By analysing the relationship between the intensity profiles of corresponding frames and the spectral sensitivity of the camera,it is allowed to estimate X-ray photon energy range in local areas of images.

通过对皮秒分幅相机和2.3μm厚formvar膜滤片的光谱响应特性分析，以及对同一时刻粘贴2.3μm厚formvar膜滤片和未粘贴2.3μm厚formvar膜滤片两幅图像径向辐射强度波形的对比，确定出获取的X光辐射图像的能谱范围：不加formvar膜滤片的X光辐射图像光子能量大于70eV，加formvar膜滤片的X光辐射图像光子能量大于150eV，同时还确定出图像各部分的光子能量分布。

Shots' experimental results show that the X-ray calorimeters are stable, the sensitivity of calorimeter is (84.1±3.4)μV/mJ and the related combined standard uncertainty in the X-ray energy measure is about 31%.

结果表明：X光量热计性能稳定，其灵敏度？？84.1±3.4μV/mJ，X光能量测量的相对合成标准不确定度约为31%，可用于X光定量测量。

Two soft X-ray spectrometers were used to measure X-ray radiation from the primary and secondary disks, respectively.

采用两台软X射线谱仪分别对初级和次级辐射的X射线进行测量，采用X射线条纹相机测量双盘靶等离子体喷射的时空扫描图象，并对实验结果进行简单的物理分析。

This paper introduces the studies of the ultra-short Thomson scattering X-ray source at the accelerator laboratory of Tsinghua University in recent years. Properties such as the photon yield,the pulse length and time jitter of the produced photon pulse were predicted theoretically from the parameters of the electron bunch and the laser pulse,and the scattering angle. Preliminary experiments were successfully carried out with a 16 MeV backward-traveling-wave accelerator and the ns-Q switched laser provided by China Academy of Engineering Physics. This paper also introduces the 1.6-cell electron gun that was fabricated on site and the experiment with high RF power including the measurement of the electron bunche parameters. Based on these,we have designed an X-ray source,which is now under construction.

介绍了清华大学加速器实验室近年来关于汤姆逊散射超短X射线源的研究工作；研究了在任意散射角度下电子束参数和激光束参数对散射光子参数的影响，给出了散射光子的参数如光子产额、脉冲长度、时间抖动等与电子束参数、激光束参数和散射角度的关系；利用实验室已有的16 MeV反波行波加速器与中国工程物理研究院激光聚变研究中心提供的ns调Q激光搭建了汤姆逊散射初步实验平台并开展了实验研究；加工了1.6-cell光阴极微波电子枪，搭建了高功率实验平台，对产生的电子束参数进行了初步测量；对汤姆逊散射超短X射线源进行了设计并开展了相关的平台建设工作，对产生的X射线脉冲参数进行了模拟。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。