检索结果-南通市图书馆

Treatment of bilateral developmental dysplasia of the hip joint with an improved technique:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第7期12卷 1320-1325页

作者： Xing-Xing Yu Jian-Ye Chen Hong-sheng zhan Ming-Da Liu Yun-Fei Li Yu-Yan Jia College of Traditional Chinese Medicine Changchun University of Traditional Chinese MedicineChangchun 130117Jilin ProvinceChina Shi's Traumatology Medical Center Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China College of Traditional Chinese Medicine The Affiliated Hospital of Changchun University of Chinese MedicineChangchun 130021Jilin ProvinceChina

BACKGROUND Developmental dysplasia of the hip(DDH)is a common osteoarticular deformity in pediatric orthopedics.A patient with bilateral DDH was diagnosed and treated using our improved technique"(powerful overturning acetabuloplasty)"combined with femoral rotational shortening *** SUMMARY A 4-year-old girl who was diagnosed with bilateral DDH could not stand normally,and sought surgical treatment to solve the problem of double hip extension and *** this child had high dislocation of the hip joint and the acetabular index was high,we changed the traditional acetabuloplasty to"powerful turnover acetabuloplasty"combined with femoral rotation shortening *** the short-term postoperative follow-up(1,3,6,9,12,and 15 months),the child had no discomfort in her lower *** the braces and internal fixation plates were removed,formal rehabilitation training was actively carried *** Our"powerful overturning acetabuloplasty"combined with femoral rotational shortening osteotomy is feasible in the treatment of DDH in *** technology may be widely used in the clinic.

关键词： Developmental dysplasia of the hip Improved technique Case report

Multiple Ecchordosis Physaliphora： A Challenging Diagnosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2015年第20期128卷 2826-2828页

作者： Xiao-Ling Zhong Biao Huang Chao Liu sheng-Quan zhan Southen Medical University Guangzhou Guangdong 510515 China Department of Radiology Guangdong Academy of Medical Sciences Guangdong General Hospital Guangzhou Guangdong 510080 China Department of Pathology Guangdong Academy of Medical Sciences Guangdong General Hospital Guangzhou Guangdong 510080 China Department of Neurosurgery Guangdong Academy of Medical Sciences Guangdong General Hospital Guangzhou Guangdong 510080 China

Ecchordosis physaliphora （EP） is a benign congenital hamartoma of the ectopic notochordal remnant, accounting for 0.5-2% of all autopsies, and found in 1.5% of all magnetic resonance imaging （MRI） of the brain. It commonly occurs along the midline within the retroclival and the prepontine cistern. EP has a slow growth rate and can vary in size from a few mm to 2 cm. Giant symptomatic EPs are extremely rare, and only four cases have been reported in the literature No cases of multiple EPs or EPs with metastasis have been reported,

关键词： Ecchordosis Physaliphora Magnetic Resonance Imaging Notochord Pathology Surgery

Suppression of Coriolis error in weak equivalence principle test using ^85Rb-^87Rb dual-species atom interferometer

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第7期29卷 77-84页

作者： Wei-Tao Duan Chuan He Si-Tong Yan Yu-Hang Ji Lin Zhou Xi Chen Jin Wang Ming-sheng zhan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences-Wuhan National Laboratory for OptoelectronicsWuhan 430071China School of Physics University of Chinese Academy of SciencesBeijing 100049China Center for Cold Atoms Physics Chinese Academy of SciencesWuhan 430071China

Coriolis effect is an important error source in the weak equivalence principle(WEP)test using atom *** this paper,the problem of Coriolis error in WEP test is studied theoretically and *** theoretical simulation,the Coriolis effect is analyzed by establishing an error *** measurement errors of Eotvos coefficient(η)in WEP test related to experimental parameters,such as horizontal-velocity difference and horizontal-position difference of atomic clouds,horizontal-position difference of detectors,and rotation compensation of Raman laser’s mirror are *** experimental investigation,the position difference between^85Rb and^87Rb atomic clouds is reduced to 0.1 mm by optimizing the experimental parameters,an alternating detection method is used to suppress the error caused by detection position difference,thus the Coriolis error related to the atomic clouds and detectors is reduced to 1.1 × 10^-*** Coriolis error is further corrected by com pensating the rotation of Raman laser's mirror,and the total uncertainty o f rj measurement related to the Coriolis effect is reduced as δη=4.4 × 10^-11.

关键词： atom interferometer weak equivalence principle test Coriolis effect

Diabetes mellitus with hepatic infarction: A case report with literature review

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第31期12卷 5091-5093页

作者： Yong-Gui Deng zhan-sheng Zhao Mian Wang sheng-Ou Su Xi-Xian Yao Department of Endocrinology The Second Hospital of Hebei Medical University Shijiazhuang 050000 Hebei Province China

Hepatic infarction rarely occurs due to the double supply of arterial and portal inflow. A 53-year-old man with diabetes mellitus developed multiple hepatic infarctions after an episode of fever and diarrhea. The infarction was documented by pathology after partial liver resection. Several causes of hepatic infarction may present in this patient： dehydration and hypotension caused by fever and diarrhea, type 2 diabetes and administration of glibenclamide, diabetic ketoacidosis and widespread atherosderosis. We suggest that diabetic patient with elevated liver enzyme should be considered the possibility of hepatic infarction.

关键词： Diabetes mellitus Hepatic infarction Computerized tomography

Countermeasures for Remediation of Soil Pollution in Metal Mines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2021年第4期12卷 62-64页

作者： Siyuan SUN Pei LI sheng zhan Zhongjun Ecological Environment(Shanghai)Co. Ltd.Shanghai 201210China

Firstly,the causes and existence state of soil pollution in metal mines were ***,the remediation technology of heavy metal contaminated soil was ***,the remediation strategies for soil pollution in metal mines were **... 详细信息

关键词： Metal mines Soil pollution Phytoremediation Mining

Application of Siemens PLC and WinCC in the Monitoring-Control System of Bulk Grain Silo

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Application of Siemens PLC and WinCC in the Monitoring-Contr...

基于灰度-梯度共生矩阵的旋转机械振动时频图形识别方法

第30届中国控制与决策会议

作者： zhan sheng Cuicui JI sheng HUA College of Mechanical and Electrical Engineering Hohai University

According to the existing problems in the bulk grain silo monitoring system, a Siemens PLC and WinCC distributed monitoring-control system was proposed. Siemens S7-300 series PLC and ET200 M were used as the lower computer in this monitoring-control system, and the upper computer adopted the industrial control computer with WinCC control program installed. Both cooperated with each other to realize the centralized management and real-time monitoring of the whole control system. Practice showed that the distributed monitoring-control system held various advantages of strong reliability, high stability, convenient operation and intuitive interaction. And it could meet the requirements of production operations well.

关键词： Bulk grain silo PLC WinCC monitoring-control system

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

振动工程学报 2009年第1期22卷 85-91页

作者：窦唯刘占生哈尔滨工业大学能源科学与工程学院黑龙江哈尔滨150001

针对旋转机械振动图形信息在故障诊断中一直没有得到充分利用,在一定程度上影响诊断技术的推广和利用的问题。研究了基于灰度-梯度共生矩阵的旋转机械故障诊断方法,该方法利用能反映图形像素点灰度与梯度的分布规律的灰度-梯度共生矩阵... 详细信息

针对旋转机械振动图形信息在故障诊断中一直没有得到充分利用,在一定程度上影响诊断技术的推广和利用的问题。研究了基于灰度-梯度共生矩阵的旋转机械故障诊断方法,该方法利用能反映图形像素点灰度与梯度的分布规律的灰度-梯度共生矩阵,直接提取和挖掘旋转机械振动信号的时频灰度图形中的像素点与其邻域像素点空间关系的特征信息,有效地提取图形中纹理特征信息后,直接利用人工免疫反面选择算法实现旋转机械故障诊断。在600 MW模化汽轮机转子试验台上进行了转子正常、转子不平衡故障、转子不对中故障及轴承松动故障的试验,诊断结果表明可以获得较高的诊断精度,并与基于灰度共生矩阵的诊断方法进行了比较,证明该方法可以提高故障诊断的准确率,验证了该方法的可行性。

关键词：旋转机械故障诊断共生矩阵人工免疫

浮环密封结构弹性对间隙泄漏量和动力学系数的影响

在线全文

学校读者我要写书评

暂无评论

推进技术 2017年第12期38卷 2815-2821页

作者：夏鹏刘占生哈尔滨工业大学能源科学与工程学院黑龙江哈尔滨150000

为了研究高压条件下浮环密封结构弹性变形对间隙流体激励产生的影响,基于bulk flow模型、有限单元法和位移-位移耦合模式,建立密封间隙流体激励和浮环结构耦合模型。通过与文献和商业软件对比,验证耦合模型的正确性和计算方法的准确性... 详细信息

为了研究高压条件下浮环密封结构弹性变形对间隙流体激励产生的影响,基于bulk flow模型、有限单元法和位移-位移耦合模式,建立密封间隙流体激励和浮环结构耦合模型。通过与文献和商业软件对比,验证耦合模型的正确性和计算方法的准确性。研究结果表明高压条件下浮环结构弹性导致密封间隙明显缩小,对心条件下,入口处弹性变形达到21.43%,泄漏量减小19.2%。同时,主刚度降低,交叉刚度相对增加,锁死偏心率越大,结构弹性的影响越明显,导致转子临界转速降低和振动响应增大。

关键词：浮环密封结构弹性 Bulk flow 泄漏量动力学系数

在线全文

学校读者我要写书评

暂无评论

高速离心泵隔舌对流体激振力的影响研究

振动工程学报 2012年第6期25卷 705-713页

作者：窦唯刘占生北京航天动力研究所北京100076 哈尔滨工业大学能源科学与工程学院黑龙江哈尔滨150001

为了研究隔舌厚度对高速离心泵压力脉动的影响规律,采用基于RNG k-ε型封闭的Reynold平均方程和滑移网格技术对三维非定常流进行了数值模拟,得到了内部流场特性及泵的压力脉动情况,并对其进行了频域分析。计算结果表明:在设计工况下,叶... 详细信息

为了研究隔舌厚度对高速离心泵压力脉动的影响规律,采用基于RNG k-ε型封闭的Reynold平均方程和滑移网格技术对三维非定常流进行了数值模拟,得到了内部流场特性及泵的压力脉动情况,并对其进行了频域分析。计算结果表明:在设计工况下,叶轮受到的激振力与叶轮和隔舌的压力脉动有关;激振力的频率主要成分是叶片通过隔舌的频率;流体激振力的幅值随着隔舌厚度的增加而增加。

关键词：高速离心泵滑移网格流体激振力频域分析数值模拟