钻孔灌注桩施工质量控制

本文作者通过本人多年的工程实践、施工中所掌握的关键环节 ,对如何控制钻孔灌注桩施工质量做了比较详细的论述     

碳纤维增强混凝土受弯构件正截面承载力设计

提出碳纤维筋的抗弯设计强度的确定方法 ,阐述了碳纤维筋增强混凝土受弯构件的设计方法和设计所需的注意事项     

大尺寸变螺距丝杠的数控加工

在数控车床上串联使用两套数控系统进行多坐标的联动控制,优化渐变螺距丝杠螺距拐点处的结构加工,实现渐变螺距丝杠的数控加工;通过实现刀具沿丝杠工件轴线的变速直线运动和丝杠工件的变速旋转运动,来进行匀变螺距丝杠数控加工,扩展了数控技术的应用和数控车床的加工范围。     

新型日光温室骨架型材的改进设计

我国早期的日光温室通常采用塑料薄膜为外覆盖材料,圆钢作骨架,细绳穿过塑料膜将其捆扎在钢骨架上。这种日光温室对塑料薄膜的损害很大,而且固定也不牢固,在春季大风天气下很容易被刮坏,大大降低了塑料薄膜的使用寿命,农户也不得不在1~2年就更换一次新的塑料薄膜,大大增加了日光温室的运行成本和农户的经济负担。为此,设计了一种用型材固定塑料薄膜的方法,并通过数学计算及强度计算,对温室的骨架型材进行改进,达到了降低成本的目的。     

计算机实验室综合管理系统的研制

本文介绍了一种计算机实验室综合管理系统的设计与实现,重点介绍了设备管理、学生实验课管理、学生零散上机管理及实验员的管理。     

钢筋抗拉强度检测中的误差与不确定度

介绍不确定度的基本概念和数学模型，并对材料力学性能测试中常见的钢筋抗拉强度检测中的不确定度进行了简要的分析和评定。     

Thymic hyperplasia causing right ventricular outflow tract compression following treatment for oesophageal rupture in an Arabian colt

True thymic hyperplasia has been reported sporadically in the human literature as an immunological rebound phenomenon following immunosuppressive treatment or disease. There are limited accounts in domestic species, mainly following vaccination, and thymic hyperplasia has not been a recognised condition in the horse to date. This report details a case of true thymic hyperplasia in a 10-week-old Arabian colt diagnosed by histopathology of core biopsy samples. The colt developed pulmonary stenosis caused by compression due to a space occupying lesion in the cranial mediastinum following a 3-month history of hospitalisation for treatment of traumatic oesophageal rupture with perioesophageal abscess formation. Diagnostic imaging of the cranial mediastinum was indicative of a thymic mass, and histopathology confirmed the mass was normal (hyperplastic) thymic tissue. The colt was treated with a tapering dose of corticosteroids, which led to involution of the hyperplastic tissue and resolution of pulmonary artery compression. Thymic hyperplasia may be an unrecognised sequela to chronic inflammation in horses and was only identified in this case when the size was sufficient to compress right cardiac outflow.     

汽缸与曲轴修理对发动机压缩比的影响

发动机汽缸和曲轴修理中,往往影响发动机压缩比的变化。由于燃烧室结构形状复杂,给计算压缩比变化带来不便。本文通过分析,提出了计算压缩比变化的简便方法。     

Myelographic localization of spinal cord compression in dogs. A comparison between cisternal and lumbar injections of metrizamide "Amipaque" in diagnosing and locating spinal cord compression.

Metrizamide is a new water-soluble contrast medium possessing unique properties, one of which is that even in an isotonic solution it has a radiographic density sufficient for a diagnostic myelogram. Whereas in the past myelography with water-soluble preparations invariably entailed lumbar injections, which are technically difficult in dogs, the fact that isotonic metrizamide causes so little tissue irritation has made it possible to inject the contrast solution into the cisterna magna. The author has compared metrizamide myelograms obtained with both cisternal and lumbar injections. Myelography with a cisternal injection is preferable for demonstrating cervical cord compressions and also in cases in which it is desirable to obtain myelographic information on both the cervical and the thoraco-lumbar areas. If, on the other hand, it is necessary to determine exactly the extent of a thoraco-lumbar compression before decompressive laminectomy, the contrast should be injected in the lumbar region in such an amount and at a pressure high enough to ensure that the contrast is forced past the site of the compression. The safety of metrizamide will probably enable a better prognosis following surgery than was previously possible.     

Endoscopic anatomy of the cervical vertebral canal in the horse: a cadaver study

Reason for performing study: Localisation of spinal cord compression in horses with cervical vertebral stenotic myelopathy is inexact. Vertebral canal endoscopy has been used in man to localise spinal cord lesions and has the potential to become a useful diagnostic technique in horses. Objective: To establish a surgical approach via the atlanto‐occipital space to the cervical vertebral canal in equine cadavers and describe the endoscopic anatomy of the cervical epidural and subarachnoid spaces. Methods: The cadavers of 25 mature horses were used to assess 3 surgical methods to approach the cervical vertebral canal, including 2 minimally invasive and one open technique. Once the approach had been made, a flexible videoendoscope was inserted into the epidural space (epiduroscopy) or the subarachnoid space (myeloscopy) and advanced caudally until the intervertebral space between C7 and T1 was reached. Results: The epidural and subarachnoid spaces could not be accessed reliably using the minimally invasive techniques. Furthermore, damage to the nervous tissues was a frequent complication with these procedures. The open approach allowed successful insertion of the videoendoscope into the epidural and subarachnoid spaces in all horses and no inadvertent damage was observed. Anatomical structures that could be seen in the epidural space included the dura mater, nerve roots, fat and the ventral internal vertebral venous plexus. In the subarachnoid space, the spinal cord, nerve roots, blood vessels, denticulate ligaments and external branch of the accessory nerve were seen. Conclusions: Using the open approach, epiduroscopy and myeloscopy over the entire length of the cervical vertebral canal are possible in the mature horse. Potential relevance: Cervical vertebral canal endoscopy may become a valuable tool to localise the site of spinal cord injury in horses with cervical vertebral stenotic myelopathy and could aid in the diagnosis of other diseases of the cervical spinal cord.