壮筋补骨丸促进家兔人工骨折愈合的组织学观察

为客观评价壮筋补骨丸促进骨折愈合的作用,选用30只雄性新西兰兔造成右侧桡骨3 mm完全缺损的骨折模型,随机分为模型组、伤科组和壮筋组,分别给予生理盐水、伤科接骨片和壮筋补骨丸灌胃,连续4周.各组动物每周处死3只,取样进行HE染色、Masson染色和PAS染色观察,并于术后28 d取右侧桡骨(骨折骨)进行扫描电镜观察.结果表明,壮筋组较模型组及伤科组提前1周PAS和Masson染色呈阳性,于2周后观察到胶原纤维大量出现,成骨过程明显快于模型组.电镜观察显示模型组术后4周骨痂生长,胶原纤维交错排列,未出现成熟的骨细胞,而伤科组及壮筋组术后4周胶原纤维平行簇状排列,出现了板质骨和骨细胞,与模型组比较差异明显,表明壮筋补骨丸能促进新西兰兔骨折愈合.     

Z-形钛合金钢板前路内固定术治疗胸腰椎爆裂性骨折的疗效观察

目的观察Z-形钛合金钢板前路内固度定术对胸腰椎爆裂性骨折患者的临床疗效。方法对60例胸腰段脊柱爆裂性骨折患者进行前方减压、椎体间植骨、Z-形钛钢板内固定,术后卧床3周,3周后戴支架起床活动。结果随访平均12.5个月,术后CT或MR显示椎管内压迫去除,植骨愈合。脊柱后凸Cobb角较术前改善12.7°,无继发脊柱后凸畸形。神经功能较术前有1~2级以上的改善。结论Z-形钛合金钢板前路内固定术对胸腰椎爆裂性骨折减压彻底,固定牢固,不破坏后稳定结构,并能一期重建脊柱系列。     

油罐浮顶焊缝断裂原因分析及整治

通过浮顶油罐浮顶焊缝断裂漏油的实例，从油罐设计、施工、检修和油罐运行管理四个方面对浮顶焊缝断裂的原因，作了较详细的分析，同时提出了防止焊缝断裂的整治措施，主要从油罐设计、大修时的补救及油罐的日常运行管理等三个方面进行了探讨。     

Clinical findings associated with chronic ischial fracture in a gelding

An 8-year-old show-jumper gelding was referred for examination as a result of a purchase dispute for reported back pain. Clinical examination identified back pain and atrophy of the left semimembranosus and semitendinosus muscles, but no lameness. Standing pelvic radiography demonstrated a chronic nonunion fracture of the left ischium, the clinical significance of which was uncertain. The apparent back pain was thought to be probably unrelated to the pelvic lesion. We conclude that chronic ischial fracture in the horse can lead to specific atrophy of the semimembranosus and semitendinosus muscles, which originate from this bone.     

CORRECTION OF ANGULAR DEFORMITY BY ASYMMETRIC PHYSEAL GROWTH AND BONE REMODELLING

Angular deformities of 25 or 37 degrees valgus were created by transverse wedge osteotomies in the diaphysis of the radius in 3-month-old Cocker Spaniels. Spontaneous correction was judged from radiographs until skeletal maturity. The magnitude of correction was estimated, using the opposite normal leg as a control. Asymmetrical physeal growth corrected the induced angulation between the proximal and distal radial joint plane surfaces (joint plane angle). The average correction of the joint plane angle was 80% in the 25 degree group, and 72% in the 37 degree group. Bone remodeling of the radial shaft corrected the induced diaphyseal angulation by 50% in both groups during the study.     

含裂纹管道承压能力的评定

应用断裂力学的Ｊ积分理论，推导了含裂纹管道的弹性评定方程和失效评定曲线表达式，对存在表面裂纹的管道承压能力进行评定，并用此方法对输库输油管道的承压能力进行评定，所得结果与现场试验数据相吻合，与美国ＡＭＯＣＯ公司对该管道分析的结论相一致，说明该评定方法是正确的，具有推广应用价值。     

木材横纹理断裂及强度准则

以杉木为研究对象从宏观和微观上研究了木才横纹断裂的性质，并阐述了木才的强韧机理。研究表明：木材横纹Ⅰ型裂纹扩展方式是先沿纤维开裂伸展，然后再沿横截面作韧性断裂，其扩展过程分线性、稳定和非稳定性3个阶段；顺纹启裂时的断裂韧性与试件尺寸无关，是木材的固有属性；木材因其多胞及纤维增强的多层胞壁结构，而具有很强的抗横断韧性，不会因裂尖应力奇异性而发生低工作应力破坏，故在对含横纹理裂纹的木构件作安全设计时，建议仍采用传统的强度准则，考虑净尺寸上的常规强度即可。     

Shear strength of beam splice joints with glued-in rods

Splitting failure in beam splice joints with glued-in rods parallel to grain in endwood subjected to pure shear is considered. A simple theoretical expression based on beam-on-elastic-foundation theory and quasi-non-linear fracture mechanics is presented for calculation of the joint strength. Tests were conducted on jointed beams in a four-point bending test setup in which the joints were located at the point of pure shear force. Hardwood dowels with a diameter of 12mm and a glued-in length of 120mm were used as rods, and various beam cross sections and dowel configurations were tested. The theory presented is found to agree well with test results in all cases in which the edge distance of the glued-in rods is relatively small. Some test results indicate that the theory may be conservative in case of large edge distances.