Treatment of a femoral fracture with a titanium locking compression plate distal femur (LCP‐DF) in a young donkey

A closed complete mid‐diaphyseal spiral fracture of the left femur in a one‐year‐old donkey was treated with a 4.5 mm titanium locking compression plate distal femur (LCP‐DF)¹. This plate was originally manufactured for human orthopaedics, primarily for femoral osteosynthesis. The LCP‐DF¹ has a distal head plate that was advantageous in this case because the distal fragment was smaller. Post operative radiographs showed optimal femoral reconstruction and a callus was present 3 weeks after surgery. The donkey was sound at the walk and trot 2 months after surgery. Radiographs taken 5 months after surgery showed stable implants and complete healing without complications.     

环氧树脂复合富马海松酸改性水性聚氨酯的合成及性能研究

以环氧树脂(E-51)和富马海松酸聚酯多元醇为原料,制备了环氧树脂复合富马海松酸改性水性聚氨酯,并探讨了环氧树脂E-51添加量对复合乳液和漆膜性能的影响。结果显示当E-51添加量为3%时,漆膜的吸水率为10.2%,拉伸强度为35.6 MPa,断裂伸长率为410.2%,摆杆硬度为0.89。通过傅里叶红外光谱(FT-IR)、透射电镜(TEM)、差示扫描量热仪(DSC)及同步热分析仪(TGA)对样品的形态及结构进行了表征。结果表明:环氧树脂中的羟基和环氧基参与了反应,部分发生交联形成网络结构;随着环氧树脂添加量的增大,制备的复合乳液粒径增大,粒径分布变宽;同时改性后的复合漆膜的耐水性、热力学稳定性、力学性能及耐化学溶剂性增强。     

断裂力学在木材学中的应用

本文介绍断裂力学基本概念及其在木材科学中的应用，应力强度因子的测试方法和计算方法以及国内外木材断裂力学的研究现状。     

断层和裂缝尺度识别的地球物理方法探讨

由于地球物理方法本身受分辨率和保真度的限制,其在断层和裂缝识别上的应用也就有精度和尺度上的差异。为此,可采用不同的方法技术来识别不同尺度的断层和裂缝,即在断层识别上,利用地震剖面和水平切片解释大断层,采用相干分析方法识别小断层;在裂缝识别上,主要采用多方位AVO方法识别大尺度裂缝的发育特征,采用成像测井来识别微小裂缝的特征情况。实际应用表明,上述方法在相应尺度断层和裂缝上的识别效果较好。     

Effects of Mixed Caulis Lonicerae japonicae Extracts on Fracture Healing and Anti-inflammation

This experiment was aimed to study the effects of mixed Caulis Lonicerae japonicae extracts on fracture healing and inflammation. Rabbit right radius fracture model was induced by dental drill in order to study the medicine's effect on fracture healing. Moreover,the contents of Ca,P and alkaline phosphatase in serum were measured to explore the influences of mixed Caulis Lonicerae japonicae extracts on serum biochemical indexes of fractured rabbits.RAW264.7 cell was induced by LPS in order to research the effect of medicine on inflammation. The concentrations of TNF-α,IL-1β,IL-6 and NO were measured by ELISA. The results showed that the rabbit fracture model was successfully prepared by dental drill, and the extracts of Caulis Lonicerae japonicae could increase the levels of Ca and alkaline phosphatase and reduce the P content in the serum of fractured rabbits. The TNF-α,IL-1β and NO levels in RAW264.7 cell induced by LPS were significantly inhibited by the extracts with concentrations ranging from 50 to 200 μg/mL (P<0.05). However, the extracts had no significant effect on the level of IL-6 (P>0.05). These results demonstrated that the extracts of mixed Caulis Lonicerae japonicae could promote the fracture healing and possessed good resistance inflammation effect.     

Analysing the Rockmass Permeation of a Low-medium Radioactive Waste Disposal Field

The fractures distribution and fracture rock mass permeation research is the premise condition that to study groundwater movement and pollutant migration in fracture rock mass in bed rock area, which includes the dominance orientation of fracture that groundwater fluxes in it, the brisk zone distribution of fracture water and the permeability calculation of rock mass. This paper mainly analyzes the fracture distribution and the dominance orientation of fracture and the permeability of a low-medium radioactive waste disposal field based on its rich geologic record. The following results are found through Statistical analysis and comparison calculation.The active zone of fractural water in bed rock is an active channel of active nucleus migration. Tthe headrace fracture of disposition have a dominant orientation. The penetrating coefficient tensor in bed rock fracture is also calculated.     

碎料板弹性模量微观力学的分析步骤和实验方法

针对刨花板、定向刨花板、重组木等碎料板弹性模量的微观力学求解理论进行综述，提出各个板种微观力学模型建立的原则，指出相应的数学模拟计算理论与方法的研究方向，编制计算机仿真计算软件库，通过这些理论可以建立这几种碎料材种、几何尺寸、胶种、铺装角及其误差、碎料力学参数、压缩比、容重等因素和板材弹性模量的定量数学关系，实现新型板种弹性模量的理论预测方法。     

STRENGTH PROPERTIES OF ROCK MASS WITH BIDIRECTIONAL INTERMITTENT CROSS JOINTS

In this paper,the strength properties of rock mass withrows of intermittent bidirectional cross joints by simulating models arediscussed.Work has been done on finding the failure mechanism of therock mass as well as the influence of joint direction and lateral pressureon tne strength of the rock mass.At the end of the paper,model testresults ahd FEM analyses are presented and strength criteria for thiskind of rock mass are proposed.