3D-printed models improve surgical planning for correction of severe postburn ankle contracture with an external fixator

Gradual distraction with an external fixator is a widely used treatment for severe postburn ankle contracture (SPAC). However, application of external fixators is complex, and conventional two-dimensional (2D) imaging-based surgical planning is not particularly helpful due to a lack of spatial geometry. The purpose of this study was to evaluate the surgical planning process for this procedure with patient-specific three-dimension-printed models (3DPMs). In this study, patients coming from two centers were divided into two cohorts (3DPM group vs. control group) depending on whether a 3DPM was used for preoperative surgical planning. Operation duration, improvement in metatarsal-tibial angle (MTA), range of motion (ROM), the American Orthopedic Foot and Ankle Society (AOFAS) scores, complications, and patient-reported satisfaction were compared between two groups. The 3DPM group had significantly shorter operation duration than the control group ((2.0±0.3) h vs. (3.2± 0.3) h, P<0.01). MTA, ROM, and AOFAS scores between the two groups showed no significant differences pre-operation, after the removal of the external fixator, or at follow-up. Plantigrade feet were achieved and gait was substantially improved in all patients at the final follow-up. Pin-tract infections occurred in two patients (one in each group) during distraction and were treated with wound care and oral antibiotics. Patients in the 3DPM group reported higher satisfaction than those in the control group, owing to better patient-surgeon communication. Surgical planning using patient-specific 3DPMs significantly reduced operation duration and increased patient satisfaction, while providing similar improvements in ankle movement and function compared to traditional surgical planning for the correction of SPAC with external fixators.

     

当代情报学进展及学术前沿探寻--近十年国外情报学研究论文内容分析

本文采用内容分析方法,对1994年以来国外5种情报学核心期刊所载2175篇学术论文的主题进行了统计分析,目的在于通过调查情报学论文在各主题上的分布状况及其结构变化,探寻当前情报学的研究进展及学术前沿领域.     

图书馆自动化管理系统的管理功能开发

对自动化集成管理系统管理功能的开发利用深度的差异，将直接影响图书馆深化服务开展及管理模式创新。在引进自动化系统后，除了要关注其是否满足传统的采、编、流、检等主要工作流程外，还应重视对其管理功能的挖掘。笔者通过多年使用美国Sirsi公司的Unicorn系统，总结出了一些通过运行系统报表实现其管理功能的方法。     

国内数字参考咨询服务研究综述

利用CNKI数据进行相关的论文统计,总结出我国近几年有关数字参考咨询的主要研究内容。     

如何看待雇佣工人的银行储蓄

银行储蓄及其所得利息具有什么样的经济性质,并不取决于储蓄本身,而是取决于储蓄所依托的社会经济关系和生产关系.在生产资料的资本主义私有制基础上,雇佣工人的银行储蓄只能是工人阶级合理支配自己的"收入",以保障自己作为雇佣工人的生活需要得到满足的一种形式,它决不可能转化为雇佣工人的"资本",从而像资本家那样去"剥削"他人的剩余劳动和剩余价值.     

Science Letters： Structure relationship of nitrochlorobenzene catalytic degradation process in water over palladium-iron bimetallic catalyst

Two isomers ofnitrochlorobenzene （o- andp-NCB） were treated by a Pd/Fe catalyst in aqueous solutions through catalytic amination and dechlorination. Nitrochlorobenzenes are rapidly converted to form chloroanilines （CAN） first through an amination process, and then rapidly dechlorinated to become aniline （AN） and CI^-, without the involvement of any other intermediate reaction products. The amination and dechlorination reaction are believed to take place predominantly on the surface site of the Pd/Fe catalysts. The dechlorination rate of the reductive degradation of the two isomers of nitrochlorobenzene （o-, and p-NCB） in the presence of Pd/Fe as a catalyst was measured experimentally. In all cases, the reaction rate constants were found to increase with the decrease in the Gibbs free energy （correlation with the activation energy） of NCBs formation; the activation energy of each dechlorination reaction was measured to be 95.83 and 77.05 kJ/mol, respectively for o- and p-NCB. The results demonstrated that p-NCBs were reduced more easily than o-NCBs.     

Optimal control of nonlinear switched system in an uncoupled microbial fed-batch fermentation process

The bio-dissimilation of glycerol to 1,3-propanediol (1,3-PD) is a complex bioprocess due to the multiple inhibitions of substrate and products onto the cell growth. In consideration of both the inhibition mechanisms of 3-hydroxypropionaldehyde (3-HPA) and the transport modes of glycerol and 1,3-PD across the cell membrane, we establish a novel switched system which is represented by a ten-dimensional nonlinear dynamical equation containing both extracellular and intracellular environments. The uncoupled microbial fed-batch fermentation process are modeled using the switched system which the glycerol and alkali are respectively poured into. Taking the feeding rates of glycerol and alkali, the switching times and the mode sequence as the control variables, an optimal control model is proposed with the concentration of the terminal time 1,3-PD as performance index. In order to maximize the yield of 1,3-PD, the control parameterization technique and the exact penalty function method are used to solve the considered problem. Numerical results show that under the obtained optimal feeding rates of glycerol and alkali, switching times and mode sequence, the productivity of 1,3-PD at the terminal time is increased significantly compared with previous results.     

两种家兔急性肾功能衰竭模型复制的方法学比较

目的:探讨两种家兔急性肾功能衰竭(ARF)模型的方法学差异.方法:皮下注射1%HgCl2(1.5ml/kg.bw,H组)、肌肉注射50%甘油(5.6ml/kg.bw、8ml/kg.bw、10ml/kg.bw三种剂量,依次为G1组、G2组、G3组)复制家兔ARF模型,测定24h和48h血清尿素氮(BUN)和肌酐(Cre)水平,观察比较各组模型复制的成功率、存活率及稳定性.结果:G1、G2两组不能成功复制ARF模型;G3组BUN、Cre较H组降低(P＜0.05).但G3组的存活率及稳定性均显著高于H组(P＜0.05).结论:两种模型复制方法各有优缺点,应根据不同研究目的选择相应的模型.     

二维条码在图书馆自动化管理中的研究

针对图书馆现有自动化管理中使用一维条码存在的存储容量小、不能脱机使用、存在两套条码系统等问题,提出一种新的图书馆自动化管理方法,即采用二维条码集中对图书馆的图书、期刊以及阅览室等多种条目进行统一管理的方法。     

我国二次文献出版延时问题及其国内外对比分析

本文分析了我国二次文献数据库存在的问题，通过对国内外数据库收录文献数量的年代分布的统计进行了对比分析，讨论了二次文献的出版延时及引起的损失问题，以我国著名检索工具《全国报刊索引》为例与国外著名检索期刊做了出版等效延时指标计算分析比较。