简介:摘要: 金风 1.5MW机组属于直驱型全功率变频机组,变流系统对空气湿度要求较高,但是由于太平风电场所处地域空气湿度较大,导致每年金风机组的湿度告警次数居高不下,功率单元损坏情况也反复出现,本文结合太平风电场实际情况,对湿度大的原因进行了分析并提出了解决措施。
简介:【 摘要 】 钛合金与铝合金是当下金属材料中运用较多的两种材料,且应用范围较为广泛。碳合金与铝合金一般情况下是分类进行的使用,但特殊情况下两种材料会共同使用,这也就对金属焊接工作提出了更高的要求。文章就钛合金与铝合金异种金属的焊接技术进行分析,以促进异种焊接技术的应用与发展。
简介: 【摘 要】目的:探讨膝关节损伤的磁共振成像技术临床应用,并应用质子密度加权( PDWI)扫描,探索最优膝关节损伤磁共振扫描参数组合,以期提高影像图像质量。方法:采用 1.5T飞利浦全新 Multiva1.5T磁共振对 100例外伤、膝关节疼痛患者进行磁共振扫描,扫描序列包括矢状位 FSE T1WI、 PDWI,冠状位 FSE T1WI、 PDWI,横断位 FSE T2WI。分析扫描结果。结果: 19例为膝关节退行性病变,半月板變性 26例, 55例膝关节外伤(包括 24例半月板撕裂)。矢状位 FSE T1WI与 fs PDWI很好地显示了前后交叉韧带损伤与半月板撕裂、变性等;冠状位 FSE T1WI序列与 fs PDWI很好地显示了内外侧副韧带损伤,敏感度较高,并且将半月板损伤准确地定位出来;横断位 FSE T2WI序列与 fs T2WI则对髌骨后缘软骨做出最清晰的评价。讨论:膝关节损伤的磁共振成像须采用多参数、多序列、多方位的扫描,通过优化序列组合从而获得高质量的图像,进而准确显示出膝关节损伤的位置、程度、类型等,为临床诊断治疗提供依据。 【关键词】 膝关节损伤; 1.5T磁共振;操作方法;图像质量 [Abstract] Objective: To explore the clinical application of MRI in knee joint injury, and to explore the optimal combination of MRI parameters in order to improve the image quality. Methods: 100 patients with knee joint pain and trauma were scanned with 1.5T Philips new multiva 1.5T Mr. the scanning sequence included sagittal FSE T1WI, PDWI, coronal FSE T1WI, PDWI and transverse FSE T2WI. Analyze the scan results. Results: 19 cases were degenerative diseases of the knee, 26 cases were meniscus degeneration, 55 cases were knee trauma (including 24 cases of meniscus tear). The sagittal FSE T1WI and FS PDWI showed the injury of anterior and posterior cruciate ligament and meniscus tear, degeneration, etc.; the coronal FSE T1WI and FS PDWI showed the injury of internal and external collateral ligament with high sensitivity, and located the meniscus injury accurately; the transverse FSE T2WI and FS T2WI made the most clear evaluation of the posterior patellar cartilage. Discussion: MRI of knee joint injury should adopt multi parameter, multi sequence and multi-directional scanning, and obtain high-quality image by optimizing sequence combination, so as to accurately show the location, degree and type of knee joint injury, providing basis for clinical diagnosis and treatment.
简介:摘要随着建筑行业日益兴盛,建筑施工越来越规范化、合理化,新型材料、技术的应用在质量、安全、节能、工期等方面的优化显得尤为重要。铝合金模板,以其各方面巨大的优越性逐渐取代传统木质模板,成为建筑工程中不可缺少的施工工艺。