Results 51 to 60 of about 3,839 (146)
Gaoya dianqi, 2018 超声波法是一种非破坏性的电力设备局部放电检测方法,运用数值计算方法可以有效地分析超声波的声场特性。为明确特高压GIS局部放电超声波信号的传播特性,采用有限元计算方法仿真研究了特高压GIS不同位置发生局部放电时超声波信号的传播特性。按照某1 100 k V特高压GIS实际尺寸,建立了特高压GIS三维仿真模型,设置单极子声源分别位于GIS中心导体和盆式绝缘子处,布置多个超声波传感器位于GIS外壳不同位置用于接收局部放电产生的超声波信号。仿真得到了GIS壁面上接收的来自不同位置单极子声源产生的超声波声压分布图,
薛建议 +5 more
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Optimization of Syringa oblata Lindl. Flower for Extraction of Polyphenols by Ultrasound-Assisted Deep Eutectic Solvents and Analysis of Antioxidant Activity [PDF]
To establish an environmentally friendly and efficient method for extracting polyphenols from Syringa oblata Lindl. flowers and study the antioxidant activity of its polyphenols, this study used ultrasound-assisted deep eutectic solvents (UADESs) to ...
Fengjian YANG +4 more
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, 2020 浆细胞性乳腺炎是一种常见的非哺乳期乳腺炎。由于其特殊的影像学表现，给早期诊断和鉴别诊断带来了一定的困难。随着高频超声、彩色多普勒、超微血管成像技术、超声弹性成像、超声造影及超声引导下经皮穿刺活检的广泛应用，为浆细胞性乳腺炎的诊断提供了更多的依据。论文拟就各项超声检查技术在浆细胞性乳腺诊断中的应用与进展作一综述。
欣 陈, 芳 王
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Zhongguo shiyan zhenduanxue, 2008 目的探讨甲状腺癌的二维和彩色多普勒超声图像特点,提高早期诊断女性甲状腺癌的准确性。方法应用高频超声诊断仪对46例女性甲状腺占位性病变经手术与病理证实为甲状腺癌的声像图进行分析,着重分析肿块内部回声的特点、边缘、彩色血流丰富程度、频谱多普勒中的多项测量指标的变化以及与周围组织的关系。结论肿块形状不规则、轮廓不清晰、向周围组织浸润,内部为实质不均质低回声,可见多发散在的点状、微粒状强回声是超声诊断甲状腺癌的重要声像图特征,而彩色血流丰富情况与颈静脉周围和锁骨上窝内淋巴结肿大有助于超声提高甲状腺癌的诊断准确性。
牛宝荣 +5 more
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Effects of Different Extraction Methods on the Quality and Antioxidant Activity of Safflower Seed Oil [PDF]
In this study, the ultrasonic-assisted and oscillation-assisted solvent extraction methodologies were employed to extract safflower seed oil using unshelled and shelled safflower seeds harvested from Xinjiang as raw materials.
Lijun SONG +3 more
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Zhongguo shiyan zhenduanxue, 2020 临床研究发现,甲状腺结节患者中,达5%至15%的人数比例会发展为甲状腺癌[1]。早期发现病灶对鉴别其良恶性、临床治疗和手术选择有重要意义。有文献报道发现,高频超声可以检测出31%-78%左右的甲状腺结节,其中80%以上为良性甲状腺结节,恶性甲状腺结节仅为6%-16%的比例[2,3]。区别良恶性甲状腺结节是确诊甲状腺结节患者的重要点,高频超声发挥着重要的作用[4,5]。本研究通过对收治的不同性质甲状腺结节患者进行了临床特征分析,并采用高频超声进行诊断,报道如下。
窦丹燕, 李柠肖, 麦湘湘
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Extraction Method and Application Progress of Chitin from Shrimp and Crab Shell Waste [PDF]
With the gradual increase in the production and consumption of shrimp and crabs, a large amount of their shells are directly treated as garbage, resulting in significant environmental pressure. Shrimp and crab shells are rich in chitin.
Jiayue JIN +8 more
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Dianci bileiqi, 1987 1.前言用超声波代替光和电子射线观察物体,或计量研究,现正广泛应用于医疗诊断装置和探伤装置等方面。由于这些研究使用的超声波频率是50kHz～10MHz,所以得到的分辨率是从厘米级到毫米级。然而,由于这些装置最近都使用了2位至3位数的高频超声渡,所以实现了具有微米等级分辨率的超声波显微镜,并且备有照射脚灯。
石川洁, 高振安
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Zhongguo shiyan zhenduanxue, 2019 目的回顾性分析已确诊的50例腹型紫癜患儿肠道超声表现,探讨高频超声对儿童腹型紫癜诊断临床价值,提高临床诊断率。方法应用高频探头进行腹部超声检查,重点观察各段肠管肠壁厚度、回声及其周围淋巴结、肠系膜回声的变化,观察肠壁的血供情况。结果 50例患儿46例超声提示腹型紫癜,超声见肠壁均有不同程度节段性或广泛性向心性全层增厚、回声减低,呈"面包圈"样改变,以黏膜下层增厚为主,CDFI:受累肠管肠壁血流丰富。肠壁损害部位多发生在小肠。1例继发肠套叠,36例出现腹腔积液、肠系膜淋巴结增大及肠系膜回声增强等伴随症状 ...
金明月 +4 more
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Research Progress on Nutritional Characteristics, Taste Quality Improvement and Functional Evaluation of Germinated Brown Rice [PDF]
Germinated brown rice (GBR) is a whole grain containing the intact bran and embryo, concentrating most nutrients and functional active compounds. However, the dense fiber structure of the bran hinders the rate and capacity of water absorption and starch ...
REN Chuanying, HONG Bin, ZHANG Shan, YUAN Di, FENG Junran, SHAN Shan, ZHANG Jingyi, GUAN Lijun, LI Bo, HUANG Wengong, LU Shuwen
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