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Bone Marrow Edema Syndrome, Revisiting a Forgotten Entity

Open Journal of Orthopedics 2020年第2期10卷 21-24页

作者： Anshul Sobti Joel James Shyam Sobti Rohit Reddy Pala Bhaskar ahmad wais osmani Joseph E. Sudhakar Rowley Bristow Unit Trauma & Orthopaedics Ashford & St Peter’s Hospitals NHS Foundation Trust Guilford Road Lyne UK Department of Radiology Dr. D Y Patil Medical College Navi Mumbai India Trauma & Orthopaedics Darlington Memorial Hospital Darlington UK

Bone marrow edema is a self-limiting, under-recognized condition. It mainly involves the lower limbs. It is characterized by pain and inability to bear weight. Diagnosis is most often based on imaging and by excluding other causes. Its exact pathogenesis is still debated and various theories are postulated. Treatment ranges from anti-inflammatories to restricted weight bearing. This overview has tried to revisit this rare and perhaps forgotten clinical-radiological condition.

关键词： Bone Marrow Edema Syndrome BMES BME Transient Osteoporosis Regional Migratory Osteoporosis Regional Osteoporosis

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Research on Torque Ripple Minimization of Switched Reluctance Motor Based on Direct Torque Control

Research on Torque Ripple Minimization of Switched Reluctanc...

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作者： wais ILMI wais 华南理工大学

学位级别：硕士

In a world that exploitation of motors is omnipresent,the Switched Reluctance Motor is widely known for its outstanding advantages namely simple structure,low manufacturing cost,reliability,flexibility in its control,possibility to work in harsh or critical environment,efficiency over wide working speed *** all these advantages,the SRM is suitable for many application such as home appliances,industrial production lines,transportation vehicles *** the acceptance of SRM by most applications is thwarted by its major drawback which is the torque *** fact,due to the double saliency of the motor,the torque ripple in SRM is naturally ***,major studies have been carried out on the SRM to address the issue of high torque *** particular drawback of the motor became the trend research amongst the international scholars *** torque ripple minimization is of a great research significance,and it is the driving motivation behind this *** core objective of this thesis is to deal with the torque ripple issue by designing a controller based on DTC *** torque ripple minimization techniques are both complex and their implementation is expensive or does not take into account the nonlinear characteristics of the motor but the designed controller shows great capability in minimization of the torque ripple,while taking into account the nonlinear characteristics of the motor,in addition to that it can be implemented with simple hardware hence it is practically *** a MATLAB/SIMULINK environment,the SRM model is built and the designed controller is *** the sake of comparison,the CCC is also *** results obtained verified the effectiveness of the method and proved that the DTC controller has great potential in minimizing torque ripple compared to the CCC *** the designed controller is tested under different working speed and the results found are *** simulations result

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超高层建筑施工中塔吊事故风险的影响因素识别及分析

超高层建筑施工中塔吊事故风险的影响因素识别及分析

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作者：维丝（wais ahmad Baheen）清华大学

学位级别：硕士

塔吊是高层建筑施工现场的主要设备之一。在恶劣的工作条件,交付时间的压力和影响塔吊正常操作的其他因素下,各种荷载在高度上提升和运输。作为高层施工的核心设备,塔吊在施工过程带来了巨大的优势,但同时塔吊影响施工现场的安全具备过... 详细信息

塔吊是高层建筑施工现场的主要设备之一。在恶劣的工作条件,交付时间的压力和影响塔吊正常操作的其他因素下,各种荷载在高度上提升和运输。作为高层施工的核心设备,塔吊在施工过程带来了巨大的优势,但同时塔吊影响施工现场的安全具备过大的风险。因此,此论文的第一阶段研究影响塔吊正常操作的安全因素并且分析塔吊安全因素对发生事故的影响率;此研究的第二阶段旨在采用定量方法来确定这些因素的相对权重。本论文的第一阶段研究旨在确定影响塔吊在高层建筑施工现存正常操作的安全因素。此外,此研究对各因素发生事故的影响程度进行了评估,并把得到的结果以图形形式呈现了。在进行研究的第一阶段所使用的研究方法基于全面文献综述,调查卷以及跟来自三个不同公司的专家团队的访谈,这些专家在进行访谈时候从事安全总监,安全经理,已经项目经理,并且对塔吊有一定的了解。本论文的第二阶段旨在采用定量方法评估以及权重这些安全因素。首先,需要使用一种可以把从专家获取的知识转为数字的方法。因此,通过访谈,文献综述以及调查卷,把层次分析法确定为适当的多属性决策工具。确定方法之后,要求专家对已确定的因素进行评估。专家评估完之后,使用了层次分析法对每个因素进行了定量分析,并提出了结果。结果实现,在影响塔吊的主要因素当中,操作员的熟练程度排名为第一,并且此结果表明操作员数量程度的主要性。对第二阶段所采用的研究方法为全面的文献综述为了确定适当的定量方法,专家访谈为了能够得出相应的结果。此外,这些因素可用于进一步研究,以减轻由于塔吊在高层建筑工地上操作而带来的风险。

关键词：塔吊定量分析层次分析法人为因素事故

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