腰间盘突出症的手术与非手术治疗

目的 探讨腰间盘突出症的手术与非手术治疗。方法 对200例腰间盘突出症的治疗进行回顾。非手术治疗132例,采用卧床骨盆牵引加药物治疗,辅以理疗等。手术治疗68例,采取开窗、半椎板切除、对年龄较大、考虑有椎管狭窄或中央型腰间盘突出较大者采用全椎板切除。结果 非手术治疗效果优良者97例,占74％。手术治疗组全部达到优良标准。结论 非手术治疗是腰间盘突出症的最基本治疗方法,可以获得很好的效果。在手术治疗时应严格选择手术适应症,尽量选择对脊柱稳定性影响小的手术方法。     

Evaluating Volume Fractions of the Elements for Composite Laminates by Using Dielectric Properties

A series and parallel model for investigating the capacity of composite laminates and the relationship between the dielectric properties of the composites and its constituents are presented. Volume fractions of the constituents are considered in this study. The expression of the complex dielectric constants for evaluating volume fractions under discrete frequencies is established and the general solutions for the resultant linear simultaneous equations for system are also exploited. The results show that the high accuracy of proposed method is obtained.     

两相体系中钌膦配合物催化3-丁烯-2-酮加氢反应的研究

含水溶性配体的过渡金属络合物催化剂由于能简便有效地与反应产物分离,近年来在两相催化体系中的应用与研究获得了迅速的发展．膦配体ＴＰＰＴＳ（三间磺酸钠一三苯基磷）由于水溶性特别大,它与过渡金属生成的络合物催化剂近年来在两相催化体系中的研究与应用尤为活跃［１～４］．我们曾先后研究报道了ＴＰＰＴＳ与ＲｕＣｌ３原位反应生成的催化活性物种及它们的配合物衍生出的催化活性物种对α,β－不饱和醛［５］和ａ,β－不饱和酮［６～７］在水及有机构组成的两相催化体系中的加氢反应性能．现以配合物ＲｕＣ１２（ＴＰＰＴＳ）３作…     

燃气源转换阀

燃气源转换阀是用法兰连接形式,将法兰板座和调风板阀接成一体。在该板阀上设有内凹圆穴腔和转换喷孔芯阀,该芯阀由芯圆板和螺栓手柄构成。在芯圆板上设有两枚异口径的转换喷孔眼和调节进风通道大小的档块,再与弧弦壳体上的径向贯通的进风条孔配合。在阀壳体的轴向外侧,设有连体的混合气室管,构成调节进风量和更换燃气源的转换机构。     

Relationship between Light Scattering Intensity and Basis Weight of Non-Woven Fabrics

The relationship between light scattering intensity and basis weight of nonwoven fabrics is studied by using the theory of electromagnetic wave propagation and scatter-ing in random media.The theoretical analysis shows that the backscattering intensity of nonwoven fabric is closely related to its basis weight,and 2 series nonwoven samples manufactured by spun-bonded and thermal-bounded processing methods are tested for checking the theoretical expression.The study shows that the scattering intensity increases with increasing basis weight of nonwoven fabrics in exponential equation,and theoretical expression is consistent with the experimental data.     

自调式分流阀同步回路动态特性数字仿真分析

用现代控制理论状态空间法建立了自调式分流阀同步回路的数学模型，并用计算机数字仿真方法对其动态特性、分流阀结构参数对动态性能及分流误差的影响，作了较系统的分析，得到了较为理想的结果。     

2,4,5-三氯苯酚的极谱研究

2,4,5-三氯苯酚是一种杀菌剂,也是制备多种农药的中间体之一。多氯代苯酚类的化合物在农药和染料工业中是一种重要的原料。文献中,有关三氯苯酚的极谱特性很少报导,对2,4,5-三氯酚极谱法的研究更未见记载。本文仅就2,4,5-三氯酚经硝化作用后的极谱特性加以介绍。实验部分主要仪器和试剂 P04型自动记录极谱仪,以饱和甘汞电极为参比电极,用饱和氯化钾的琼脂盐桥同电解池相连接。硝酸:G.R.;硫酸:A.R.;乙醇:95％     

Investigation on the Relationship between Specimen Width and Breaking Strength of Geotextile

The tensile properties of geotextile are analyzed with the boundary elemont method, with special emphas/s put on the of specimen width on geotextile breaking strength. The theoretical and experbnental results showed that narrow spec/men would underestinmte the tensile srtength of the geotextile. During testing procedure, the lateral contraction of the specimen is the mare reason that causes the breaking strength to be on the lower side. The theoretical results also indicate that the breakin, streugth of the the would arrive at a fixed value when the specimen width is increased to a certain extent.