Impact of arteriovenous fistula cannulation on the quality of dialysis

Introduction: Adequate hemodialysis directly improves health. Puncturing an arteriovenous fistula (AVF) and the amount of blood recirculation greatly affect the quality of dialysis. Few studies have assessed the method to cannulate a fistula and its influence on efficiency of hemodialysis. Methods: This prospective pilot study included 14 patients with end‐stage renal failure receiving regular intermittent hemodialysis. Patients received three consecutive treatments with both needles directed upstream then three consecutive treatments with the venous needle directed upstream and the arterial needle directed downstream. With both techniques, the distance between the needles was kept constant at 2.5 cm. Recirculation rate and Kt/V ratio were measured during each treatment using thermodilution and a diascan Fresenius generator. Findings: The 14 patients received 84 hemodialysis sessions: i.e., 8 (57.1%) males and 6 (42.8%) females, mean age 62.3 ± 15.57 years. Results showed that mean recirculation rates and Kt/V did not significantly differ between the two techniques. Discussion: Because no significant difference was found between the two techniques, the direction of insertion of needles should be decided upon on a case‐by‐case basis depending on the anatomy of the AVF and the feasibility of the puncture.     

韩国电信市场发展与政府管制

从管制机构与管制政策两个方面介绍了电信市场管制的基本情况.从非对称管制、资费管制、要求移动运营商提供用户手机号码薄以及对移动信息内容的管制四方面阐述了韩国政府的管制政策.说明了韩国移动市场的发展情况以及韩国近期的购并活动.     

The management of the project-based organization: A personal reflection

In this paper I make a personal reflection on my research and writings in the field of Project Management over the past 30 years. My research has primarily been about the management of the project-based organization. Within that I have researched governance, organizational behaviour, contingency, marketing, success and shareholder value.     

基于嵌入式的电容触摸屏接口设计

提出了基于嵌入式的电容触摸屏接口设计,根据电容式触摸屏控制器FF5202的工作原理和功能,采用S3C2410作为主机,设计了S3C2410与Fr5202的硬件接口电路,实现了S3c2410对FT5202访问控制的驱动程序,并通过划痕和图片缩放功能测试得以验证.     

The Connection between Czc and Cad Systems Involved in Cadmium Resistance in Pseudomonas putida

Heavy metal pollution is widespread and persistent, and causes serious harm to the environment. Pseudomonas putida, a representative environmental microorganism, has strong resistance to heavy metals due to its multiple efflux systems. Although the functions of many efflux systems have been well-studied, the relationship between them remains unclear. Here, the relationship between the Czc and Cad systems that are predominantly responsible for cadmium efflux in P. putida KT2440 is identified. The results demonstrated that CzcR3, the response regulator of two-component system CzcRS3 in the Czc system, activates the expression of efflux pump genes czcCBA1 and czcCBA2 by directly binding to their promoters, thereby helping the strain resist cadmium stress. CzcR3 can also bind to its own promoter, but it has only a weak regulatory effect. The high-level expression of czcRS3 needs to be induced by Cd²⁺, and this relies on the regulation of CadR, a key regulator in the Cad system, which showed affinity to czcRS3 promoter. Our study indicates that the Cad system is involved in the regulation of the Czc system, and this relationship is important for maintaining the considerable resistance to cadmium in P. putida.     

含区间右端线性规划的弱最优性

在研究区间线性规划时,如何判定可行解是否为弱最优解是一个比较重要的问题。讨论了区间右端值线性规划的一般约束问题,通过运用线性规划中的KT条件,得到了检验可行解是否为弱最优解的充要条件。方法简单实用,且在多项式时间内可解。     

Pseudomonas putida KT2442制备中长链聚羟基烷酸酯

初步探讨了利用PseudomonasputidaKT2442制备中长链聚羟基烷酸酯(MCL PHAs)的工艺,考察了不同碳源对菌体生长和产物合成的影响。在2.5L发酵罐上采用高密度细胞培养制备:以油酸为碳源,细胞干重达120g L,MCL PHAs质量浓度达40g L,产物质量分数为34%,生产速率为0.965g·L-1·h-1;以玉米油水解物为碳源,细胞干重达105g L,MCL PHAs达28g L,产物质量分数为26.5%,生产速率为0.667g·L-1·h-1。以玉米油水解物为碳源所得细胞浓度、产物浓度与以油酸为碳源所得结果比较接近,有利于降低生产成本。     

基于ICT切片机械零件的实体反求误差分析

反求工程中,在进行ICT切片图像处理时,对轮廓曲线的处理和轮廓数据的提取非常关键,它直接影响到利用NURBS曲线和曲面反求实体的精度。本文提出了一种基于亚象素的轮廓提取算法,提高了轮廓数据的提取精度。将其与像素级轮廓提取的数据进行实体反求的误差做了分析与比较,证实该方法极大地降低了实体反求的误差。     

橡胶用油的研制

采用溶剂精制工艺处理糠醛抽出油、催化裂化回炼油,用以生产橡胶用油.通过实验证明, KT液溶剂精制工艺能生产出橡胶用油,其副产物抽余油可作为催化裂化原料.该工艺具有较好的经济性.