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Objective: To study the significance of internal fixations of intertrochanteric hip fractures in elder patients by comparing the effects of various kinds of internal fixations. Methods: One hundred and twelve senile patients with intertrochanteric hip fractures were followed up. They were treated with the four kinds of operations respectively: dynamic hip screw(DHS), locking proximal femur plate(LPFP), proximal femoral nail antirotation(PFNA)and femoral head replacement(FHR). The data of each group were collected for statistical analysis on the following aspects: operative time, mean intraoperative blood loss, postoperative complications, and the Harris hip function scores. Results: The operative time, blood loss and postoperative complication in PFNA group was significantly less than the other groups(P<0.05). And the results of the DHS group, the LPFP group and the FHR group were similar(P>0.05). The Harris hip score of PFNA and FHR group were superior to the other group(P<0.05). But, the Harris hip score of PFNA and FHR group was similar(P>0.05). Conclusions: 4 kinds of internal fixations have their advantages and disadvantages, so the reasonable kind of internal fixations should be chosen to treat different type of intertrochanteric fractures in the senile patients. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tianjin Medical Journal is the property of Tianjin Medical Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

目的 分析智齿冠周炎患者的口腔健康相关生活质量(OHQOL)及冠周袋菌群变化.方法 选取智齿冠周炎患者144例(智齿冠周炎组),同期体检健康者144例为空白对照组.采用口腔健康影响程度量表(OHIP-14中文版)评价两组OHQOL;采集两组菌斑,涂片后进行革兰染色,正置高倍显微镜计数细菌数量及G+菌、G-菌、螺旋体所占比例.结果 智齿冠周炎组OHIP-14总分为(18.94±5.04)分,空白对照组为(10.53±7.03)分,二者比较P＜0.01.智齿冠周炎组冠周袋内G+菌所占比例低于空白对照组(P均＜0.01),G-菌、螺旋体所占比例及细菌数量均高于空白对照组(P均＜0.01).结论 智齿冠周炎患者OHQOL降低,冠周袋菌群比例失调. [ABSTRACT FROM AUTHOR]

亚健康状态是临床常见的一种病症，近年来在我国的发病率有明显增加的趋势，而且逐渐年轻化 [1] ．笔者于2008 年 4 月 至 2013 年 6 月采用中西医结合疗法治疗亚健康状态 60 例，疗效满意，现报道如下. [ABSTRACT FROM AUTHOR]

The various types of error coupling transmission mechanisms and the dimensional tolerance optimization design of multi-faceted shafting assembly are analyzed by taking the multi-faceted shafting assembly as the research object. Monte Carlo method is used to simulate the measured size of assemly ring,and the mean value of radial run-out tolerance and its distribution law are obtained. A prediction method for the radial circle run-out of variable boundary circle is proposed,and the integrated cumulative error including the coaxiality and the matching tolerance of shaft hole is established. This method is extended to the assembly error modeling of complex assembly to realize the prediction of the radial run-out tolerance in the design. With the goal of accumulating the radial runout at the end of the assembly,the average assembly accuracy,assembly reliability,and processing cost are set as constraints,and the optimization of system structure and its component tolerances is performed. Taking the design of a certain type of torque converter as an example,the feasibility and practicability of this method for predicting the cumulative radial run-out tolerance of the shaft system are verified. [ABSTRACT FROM AUTHOR]

The load fluctuation and vibration of blade should he analyzed in the design of high power den­sity and compact stamping-welded tofque converter. The simulation is based on fluid structure interaction and dynamic mesh. The load fluctuation and vibration in time domain are extracted by setting the monitoring points along the blade From inlet to outlet. Fast Fourier transform and modal analysis are used in frequency domain analysis. The analysis results indicate that the max toad fluctuation and blade vibra­tion are at the inlet of blade because of the hydraulic impact, and the amplitudes of load fluctuation and blade vibration decay along inlet to outlet at a certain speed ratio. As the speed of turbine is higher, the amplitudes also decay. The peak frequency of load fluctuation is between the second-order and third-order modals, and also the amplitude of load fluctuation decreases at higher speed ratio. [ABSTRACT FROM AUTHOR]

A coordinated hierarchy control strategy of driving torque is proposed for the distributed electric drive tracked vehicle. The coordination control system structure is developed, which is divided into motion control layer, control allocation layer and anti-slip layer. The vehicle is considered to be an unequal over-actuated system. A master-slave multi-motor control allocation law is established. The quadratic programming method is used to design the torque optimization distribution law of in-wheel motors, and the weighted least square (WLS) method is used to solve torque distribution , which could improve adhesion margin and decrease friction loss between motor wheels and track. The anti-slip control law developed by LADRC is used to enhance the adhesive force by restricting the slip of drive wheel. Co-simulation of Matlab and RecurDyn shows that the control allocation could realize torque optimization distribution, and LADRC anti-slip controller could regulate the slip speed in steady margin, which could improve the stability and efficiency of force transfer. [ABSTRACT FROM AUTHOR]