成对比较

Materials and Methods:236 pathology-confirmed breast lesions(155 malignanty,81 benignancy) and 221 disease-free contralateral breast tissues were examined using EPI-DWIb values=0,1000 s/mm~2TR/TE=8400ms/93.8ms; FOV=30×30cm;matrix=128×128;ASSET=2,slice thickness=4mm.DCE-MR imaging was also performed for accurate location of the lesion using VIBRANT sequence.The mean ADC values of malignant and benign lesions and the disease-flee contralateral breast tissues were calculated from the ADC map for each patient.One-way analysis of variance was applied to compare the mean ADCs of malignant lesions with benign lesions and disease-flee contralateral breast tissues.The threshold ADC value for malignant lesion was determined using a receiver operating characteristic(ROC curve analysis.Each lesion was classified into two major types:mass and non-mass lesion.The diagnostic performance of DWI was compared in breast mass and non-mass lesions.Results:155 malignant and 81 benign lesions were confirmed in 236 lesions.

材料与方法：搜集术前行乳腺MR检查并经穿刺或手术病理证实的236例乳腺病变，以对侧正常乳腺腺体作为正常对照，采用横轴位的平面回波-扩散加权成像序列，TR=8400ms，TE=93.8ms，层厚=4mm，激励次数=2：视野=30×30cm，矩阵=128×128，ASSET=2，b值=0和1000s/mm~2；参考动态增强图像准确定位，测量病变区和对侧正常乳腺腺体的ADC值，应用t检验比较良、恶性病变及正常腺体ADC值的差异，采用接收者工作特征曲线(receiver operating characteristic curve，ROC)确定良恶性病变的ADC界值；根据BI-RADS MRI将乳腺病变按照形态学表现分为肿块性病变和非肿块性病变两组，比较ADC值在肿块和非肿块性病变中定性诊断的效能。

The visible spectrum of Mo in Ti-based alloy was analyzed by a digital spectroscope. Mo 553.31nm and Ti 551.44nm were selected as spectral lines for analysis and comparison. Samples of Ti-based alloys with different Mo contents were analyzed quantitatively. The data indicated that the ratio of intensities between analytical spectrum and comparison spectrum has a positive relationship with the content of Mo.

使用数字化看谱镜对钛合金中钼元素可见光谱进行了分析测定，选用M0553.31nm和Ti551.44nm作为分析谱线和比较谱线，对不同Mo元素含量的钛合金样品进行了定量分析探索，数据显示分析谱线和比较谱线的强度比值与Mo元素含量成正比关系。

In addition, some modifications on several computational methods are also presented. Using LMTO method the electronic structure of several systems are studied, and some results are obtained. They are: The ideal Nb (100) surface has three surface states, the multi-layer relaxed surface has two surface states. The surface energy of the ideal surface is higher than that of the relaxed surface, that means that the multi-layer relaxed surface is more stable than the former one, which supports the LEED results. The mono-layer relaxed Ag (111) surface is the most stable one among several" stable surface models"presented by several researchers. The surface energy of Ag (111) surface is higher than that of surface Ag (001), which supports some experimental results such as different reaction rate at different surface orientations for the same material. The surafce states of Si (111) surface not only locate near the Fermi level, but also in the valence band, which agrees well with Cohen's conclusion. Si (111)-H is an effective model for analysing the surface states and H adsorbed on the back surface is a good method for improving the convincingness of the results obtained on thinner slab models. The surface stability depends on three different kinds of MoSi〓(001) surfaces, the surface with mono-layer Si is the most stable one, and the surface with Mo at the first layer is the most unstable one among them. These are consistant with the Kemoda's experimental results. The valence bands of clean or K adsorbed CdTe (111) surface agrees well with the synchrotron radiation studies. The surface of CdTe (111) consists of four kinds of surface models which show different surface electronic structures and different surface structure stabilities. The conclusion agrees well with Wu's experimental work. The different absorbed alkali metals on the CdTe (111) surface give different adsorption characteristics which have relations not only with the valence electrons, but also with the core ones of the alkali metals. The electonic structures of Si-C alloys are different from that of Si-Ge alloys, and the energy band gaps of Si-C alloys do not increase linearly with Carbon concentration, our conclusion supports Alexander's results, but conflicts with Soref's one.

现分述如下： LMTO方法及其应用方面：1）通过对Nb（100）表面电子态分析发现清洁理想表面有三个表面态，多层弛豫表面有两个表面态；表面能大小说明多层弛豫表面更稳定，支持了LEED结果。2）通过对采用不同方法获得的几种不同Ag（111）表面稳定结构的表面能计算分析，给出了单层弛豫表面为Ag（111）表面的最稳定结构；从Ag（111）单层弛豫表面和Ag（001）表面的表面能比较，发现了Ag（001）表面表面能要比Ag（111）小的，表明了同种物质不同表面取向将表现出不同物理、化学性质，这是与实验中得出的结论是吻合的，3）通过对Si（111）表面态分析，不仅发现了Si（111）表面不仅具有居于费米能级附近的悬挂键所对应的表面态，而且还有很多表面态位于价带能量范围内，与Cohen等结果一致，H饱和slab模型背表面相当于增加了slab层的厚度，是一有效的变相增加slab层厚的方法，弛豫表面较清洁理想表面价带谱们低能端的少许移动，预示着总能降低，说明弛豫表面较清洁理想表面稳定。4）MoSi〓具有三种表面，从费米能级上态密度值大小得到单层Si表面最稳定，Mo原子为表层原子的表面最不稳定，双层Si原子表面居中的结论，这与Kemoda等人实验结果是一致的。5）通过对CdTe（111）表面表面电子态、表面结构稳定性及表面H、碱金属吸附的电子结构系列研究，不仅得出了CdTe（111）清洁及碱金属K吸附价带谱与同步辐射光电子谱相吻合的结果，而且发现了CdTe（111）表面具有四类不同原子近邻特征，表现出四类不同的表面结构及电子结构特征：不同表面态分布、不同的表面结构稳定性（表层原子与次层原子成三键有一悬挂键的表面要比表层原子与次层原子成一键有三悬挂键稳定（与Wu等人实验结果一致））、不同的H吸附特性。

We also present the test result of impulse response with the overthrust model.

继而，对岩丘模型，文中讨论了成像参数的选择、地震子波对成像精度的影响、并完成二维及三维叠前深度偏移的比较；对推覆体模型，文中进行了脉冲响应测试。

Studying the related theory to the atical first, for example .competing theory, parallel theory , city Risorgimento theory and so on, carries out qualitative analysis on development of Cheng Hua District again , basing the qualitative analysis apply the SPSS software to analyse the way studying Cheng Hua District on quantitative analysis , to work out corresponding way to improve chenghuas competing power.

目前，有大量的文章宋阐述区域竞争力，但是往往都是以国家竞争力或者是省域的竞争力作为研究对象的，选取的指标个数多，涉及到的方面都很广，本文集中在成都市的五大主要城区进行分析研究，首先研究与本文相关的理论基础，例如竞争理论，比较理论，城市复兴理论等，再对成华区的发展进行定性的分析，再定性分析的基础上，运用SPSS软件分析研究成华区在这几个城区当中区域竞争力的综合排名，进行定量分析，以便对制定相应的区域竞争力提升办法。

Methods MR Perfusion Weighted images was performed in 47 patients with meningiomas followed by conventional imaging.Results The mean rCBV values of angioblastic was the highest in the parenchyma of tumor.

对47例脑膜瘤病人行MR灌注成像检查，对5种亚型的良性脑膜瘤的MR灌注成像进行分析，并与非典型性及恶性脑膜瘤进行比较。

Wound healing of rat skin may be arbitrarilydivided into the following stages: wound generation, suppurating in someinflammation area, growing of granulation tissue, scab formation,decrustation, and completely healing. The wound depth and the extent ofhealing also could be determined from the OCT images in the different healingtime. Healing time for the skin scald was found to be much shorter than those ofthe skin wound. Because the skin wound is serious than the skin scalds. 3 The result of using OCT to monitor the model of acetic acid gastric ulcer in rats:Results of this experiment showed that using OCT technology can identify theulcerative gastric mucosa tissues with normal tissues, make the imaging on theunder-layer of gastric mucosa tissues, and evaluate the healing period and healingquality. From the OCT images can be clearly found the acetic acid gastric ulcer.

3大鼠胃溃疡模型的OCT成像检测结果：实验结果显示利用OCT能够实现溃疡组织的成像，可显示正常胃壁组织的层次性结构，对于溃疡病变过程中可对黏膜下病变的深度与状况进行成像分析，从图像可以很明显的发现溃疡性炎症病变区域(这个区域由于散射光变弱，颜色相对比较暗)，在愈合的后期黏膜层基本愈合的状态下仍可显示黏膜下层组织的增生、未能完全愈合等病理改变。

This implies that equity method is favored by the market. This thesis has conducted a relatively comprehensive review andcomparison of cost method and equity method. Also, it has analyzed themeasurement issues under cost method and equity method, and empiricallytested the market reaction to the choice between the two. Theseanalyses provide some preliminary evidence which could help improveaccounting system and make an informed decision between them. Last,but certainly not least, this thesis can contribute to the further studyin the subject matter, with the hope that more enlightening researchwill follow.

本文较为全面地回顾和比较了成本法和权益法的发展和特点，以规范研究方法对股权投资的计量进行了较为全面的分析，并首次用我国市场数据检验了成本法和权益法会计结果的市场反应，从信息有用性的角度，为会计制度的改进和选择提供了初步的依据，也为我国对长期股权投资的计量问题做进一步研究起了抛砖引玉的作用。

We carry on studying and designing of drainage pipe imaging testing system comparatively lately. Therefore, it is epoch-making and meaningful that I study the drainage pipe ultrasonic imaging testing system for our country"s online ultrasonic imaging testing system. And it is very much meaningful that we improve our country"s drainage pipe level.

由于我们国家对排水管道成像检测的研究起步比较晚，所以本课题研究的排水管道超声波成像检测系统对我们国家排水管道在线成像检测具有非常重要的意义，同时对提高我国的排水管道检测水平，也具有十分重要的意义。

Abstract］ Objective To assess the endothelium-dependent relaxation in patients with essential hypertension or hypertension smokers by color Doppler flow imaging.Methods With intermittent ultrasound imaging and power Doppler imaging,we measured endothelium-dependent relaxing function in 72 subjects 24 of whom with essential hypertension,24 of whom with both hypertension and smokingand the others as normal control.We measured the diameter of the superficial femoral and brachial arteries at rest,during reactive hyperaemia,re-test and after sublingual glyceryl trinitrate for evaluating the endothelium-independent dilatation in subjects.The level of plasma NO,ET,PGI2,and TXB2 were determined.

摘要］ 目的探讨原发性高血压及高血压合并吸烟患者血管内皮依赖性舒张功能的改变方法采用彩色普勒高频超声的间歇成像和能量多普勒成像，对24例原发性高血压患者、24例高血压合并吸烟患者及24例正常血压无吸烟史者的血管内皮依赖性舒张功能，包括静息时血管内径、增加流量引起的血管舒张、硝酸甘油引起的血管舒张等，以及对血浆氧化氮、内皮素、血栓素B2（TXB2）和列腺环素（PGI2）等血管活性物质进行检测并比较分析。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。