回波定位

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。

Based on bat sonar technology and pattern classification, a texture classification system was set up to classify three types of texture: pasteboard, foamboard and woodboard.

在蝙蝠的回波定位和目标识别模型的基础上完成了目标材质识别的工作。

One of major problems in PCL applications is the direct path interference.

无源相干定位系统中的主要问题之一就是接收机接收到的目标信号回波中的直达波干扰。

We found late magnetic reaction waves in two hemisphere of these volunteers by hearing animal's names and plant's names and the left hemisphere waves were much differentiate than that of right hemisphere. The results showed that Sensory's area is located at middle temporal gyrus, superior temporal gyrus and supramarginal gyrus.Conclusions: Sensory's area of Chinese people coincidence with the classic language center, that is, Sensory's area of Chinese people is located at middle temporal gyrus,superior temporal gyrus and supramarginal gyrus.

结果：所有受试者听动脉名称、植物名称均在双侧大脑半球诱发出明显的晚发磁反应波，其中左侧大脑半球磁反应波分化较右侧大脑半球好，听觉性语言中枢定位于左侧颞中回、颞上回、缘上回，结论：母语为汉语的正常人听觉性语言中枢与经典的语言中枢基本相符，即听觉性语言中枢定位于左侧颞中回、颞上回、缘上回。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐