Lorazepam impairs highway driving performance more than heavy alcohol consumption

While research indicates that benzodiazepine (BZD)-like drugs impair driving performance, it remains unclear (i) how far BZDs affect lane-keeping performance, compared with alcohol and (ii) to what extent this impact can realistically be measured in a simulated environment. To clarify these issues, 16 healthy male drivers who had never previously taken BZDs underwent a randomized, crossover, double-blind, placebo-controlled driving paradigm (with the BZD lorazepam) in both real-world and simulated settings. Two lane-keeping variables, namely inappropriate line crossings (ILCs) and standard deviation of lateral position (SDLP), were recorded during the driving sessions. Analyses revealed that (i) a single lorazepam dose (2 mg given by mouth) caused higher SDLP increases than a blood alcohol concentration of above 0.05%, and that (ii) this BZD effect was amplified in the simulated driving setting, mainly for ILCs. As a consequence, we recommend that physicians be made more aware of BZD-related risks and that researchers make a clear distinction between the effects of BZD intake per se and the impact of simulated driving settings.     

Development of a flexible robotic welding system for weld overlay cladding of thermoelectrical plants’ boiler tube walls

The walls of the boilers of power plants undergo corrosion and wear during operation. The reduction in thickness is measured periodically to prevent collapse of the tubes and consequent operation stoppages for long periods. The solution that is usually applied to increase the availability of power plants is gas metal arc welding (GMAW) cladding of the walls with metal alloys that are more resistant to wear. Application occurs in two distinct locations: the boiler and the workshop. Small worn areas are coated inside the boiler itself, while in the workshop, panels are coated so that they can either be used in the boiler’s most affected regions or to produce new walls with higher wear resistance. Mechanized welding produces better results than manual welding; however, in current systems, the oscillating movement of the torch is generated by a single axis. This limitation renders the welding process unstable if the aim is to reduce bead reinforcement and the number of weld beads by increasing the amplitude of the torch oscillation. This instability produces high spattering and excess penetration due to the change in the contact tip to work distance (CTWD), since the power of the welding electric circuit is a function of this distance and since the constant changes in CTWD disturb the metal transfer dynamics. This paper shows that it is possible to overcome the technological difficulties for both application sites and to make automatic cladding operations more productive and of a better quality. For this, a dedicated Computer Numeric Control (CNC) robot with four degrees of freedom was developed, as well as the methodology for generation of its trajectory. The cladding obtained by pulsed GMAW with ER309L stainless steel is presented in order to validate the developments.     

9.8 tex竹纤维纱上浆体会

为解决竹纤维吸浆速度快、纱线吸湿后易膨胀造成粘并的问题,对9.8 tex竹纤维纱进行上浆实践.采用GM8-60和CP-L为主浆料的配方,以减少纱线毛羽、增加耐磨性;HS-30型浆纱机Ⅰ辊压力为13 kN,Ⅱ辊压力为16 kN,并且严格控制烘燥温度和车速,减少了对浆纱强力的影响.通过整经、浆纱采取一系列有效措施,使该品种在ZAX-E型织机上的织造效率达到90%.     

喷气织机生产CJ 7.3 tex细布的体会

为了生产出用户满意的7.3 tex细布,首先选择了优质纱线,同时配合以整经、浆纱、织造合理的工艺参数,并针对织造工序存在的纬向停台多的问题,采用正交试验法优选了入口时间、主喷嘴压力、主喷嘴启闭时间三个参数,对不同停车档给出了开车补偿功能中的补正量和逆转量,使十万纬纬停由16.7次下降到9.46次,织造效率达94%.     

M8300型多梭口织机织造分析

介绍了M8300型多梭口织机的织造原理，通过对织造过程的分析发现，纬纱的负荷比喷气织机低，可以扩大纬纱的适织范围；而经纱受开口片的刮动、多梭口的拉伸等机械作用，必须提高经纱的质量以减少断头；对筒子纱退绕速度提出了更高的要求。     

CANBUS在织机控制系统中的应用

参考国外高档织机控制系统，简单介绍了CAN总线并讨论CAN在织机控制系统中的应用前景及织机生产管理的网络化。     

无机非金属纤维制品的结构及其应用

总结无机非金属纤维的性能、无机非金属纤维制品的结构及其对复合材料的影响。对无机非金属纤维制品进行了分类,且将无机非金属纤维纺织制品分为三维机织物、三维编织物,对典型结构纺织制品进行了结构、工艺和成形方面的分析。认为在对无机非金属纤维纱线进行织造时要充分考虑纤维刚度大、弹性差、断裂伸长小和脆断裂的特点,需对某些机构进行改进并适当调整织造工艺,在设计无机非金属纤维制品的结构时要充分考虑三维织物中纱线弯曲对织物最终性能的影响,在复合材料成形时,三维编织结构是一种不稳定结构,2.5D结构是一种稳定结构。提出了对无机非金属纤维经纱进行上浆的必要性。     

在喷气织机上开发细号高密双层布的实践

为了解决高密双层布在喷气织机上织造时经向停台高、纬缩疵点多等问题,通过对其纱线及组织结构特点的分析,从减少经纱间摩擦及增强纱线耐磨性能角度出发,优化了穿综顺序及停经片穿法,并合理设置经位置线、开口时间、开口动程、引纬工艺,使该品种织造效率从初期的70%上升到92%以上,下机一等品率达85%以上.     

CJ 5.8 tex紧密纱高密直贡缎的开发

为了顺利生产经纬纱均为紧密纱的细号高密直贡缎产品,重点介绍了紧密纺特细号纱,浆料配方、浆纱工艺及织造工艺的参数设置和织造效果.强调紧密纺特细号纱采用"两中一低"的浆纱工艺;织造过程中采用早开口,迟引纬,调整绞边及废边纱穿法,有效解决了织造疵点,使织造效率达到82%以上.