浅谈涤纶全拉伸丝油剂

介绍了涤纶全拉伸丝(FDY)工艺对纺丝油剂的要求,概括了国内外涤纶FDY纺丝油剂的研究状况,就油剂用表面活性剂原料的选择、油剂的配制、油剂配方设计以及油剂使用过程中应注意的一些问题进行了阐述。     

滑动弧放电等离子体-溶液系统协同零价铁降解酸性橙Ⅱ

为探究等离子体-溶液系统联合零价铁(ZVI)Fenton反应对酸性橙Ⅱ(AOⅡ)的降解效果,考察ZVI对降解过程的促进作用及降解机理,建立了滑动弧等离子-溶液系统进行了实验研究。以质量浓度200 mg/L的AOⅡ为例,改变ZVI投加量分别为0、4、7、10、13 g。结果显示ZVI投加量为10 g时,AOⅡ的降解程度最高,为97.8%。等离子体-溶液系统中滑动弧放电产生的H2O2与加入的ZVI结合发生Fenton反应,AOⅡ降解过程遵守一级动力学规律。对比不加入ZVI时的AOⅡ反应速率常数,加入10 g ZVI后初始质量浓度为100、150、200、250、300 mg/L的AOⅡ反应速率常数分别提高了12.9%、31.0%、39.4%、44.3%、47.8%。溶液化学需氧量(COD)去除率也表明了在降解过程中加入ZVI能够有效地提高降解率。运用色谱-质谱联用仪(GC-MS)测定了AOⅡ的降解机理,认为*OH攻击AOⅡ分子上与萘环相连的—N N—键,导致—N N—键的断裂,并经过一系列的氧化过程后形成无机小分子物质。     

开采沉陷中的层面效应研究

根据复合岩梁理论，推出了开采沉陷中层面滑移函数和层面滑移判断式。获得了层面滑移规律：即当弹性模量一定时，随主要影响半径ｒ的增大和最大下沉值减小，滑移间距增大；当ｒ和最大下沉值一定时，随着弹性模量的增加，滑移间距减小；随层面抗滑力的增加，滑移间距增大。     

滑动弧放电等离子体法用于二甲醚重整制氢简

Gliding arc gas discharge plasma was used for the generation of hydrogen from steam reforming of dimethyl ether （DME）. A systemic procedure was employed to determine the suitable experimental conditions. It was found that DME conversion first increased up to the maximum and then decreased slightly with the increase of added water and air. The increase of total feed gas flow rate resulted in the decrease of DME conversion and hydrogen yield, but hydrogen energy consumption dropped down to the lowest as total feed gas flow rate increased to 76 ml. min^-1. Larger electrode gap and higher discharge voltage were advantageous. Electrode shape had an important effect on the conversion of DME and production of H2- Among the five electrodes, electrode 2# with valid length of 55 mm and the radian of 34 degrees of the top electrode section was the best option, which enhanced obviously the conversion of DME.     

滑翔增程弹鸭式舵的气动设计与分析

为了保证滑翔增程弹箭在滑翔飞行过程中有效地增程,必须对滑翔弹箭的舵面进行气动设计与分析.阐述了制导炮弹舵面参数确定的原则,研究了滑翔增程弹舵面几何参数的选择、舵面尺寸确定的方法.仿真结果表明,采用该方法确定的舵面气动性能能够保证滑翔增程弹在滑控段飞行过程中稳定性适当,静稳定性储备量约在4%左右;操纵性较好,舵面偏转10°,能够产生约6°的平衡攻角;稳定性与操纵性、舵偏角和平衡攻角匹配较好,为滑翔增程弹舵面的气动设计提供了参考.     

Applications of Plasma-Activated Water in Dentistry: A Review

The activation of water by non-thermal plasma creates a liquid with active constituents referred to as plasma-activated water (PAW). Due to its active constituents, PAW may play an important role in different fields, such as agriculture, the food industry and healthcare. Plasma liquid technology has received attention in recent years due to its versatility and good potential, mainly focused on different health care purposes. This interest has extended to dentistry, since the use of a plasma–liquid technology could bring clinical advantages, compared to direct application of non-thermal atmospheric pressure plasmas (NTAPPs). The aim of this paper is to discuss the applicability of PAW in different areas of dentistry, according to the published literature about NTAPPs and plasma–liquid technology. The direct and indirect application of NTAPPs are presented in the introduction. Posteriorly, the main reactors for generating PAW and its active constituents with a role in biomedical applications are specified, followed by a section that discusses, in detail, the use of PAW as a tool for different oral diseases.     

非热等离子体烃类燃料氧化重整反应器的研究进展

燃料氧化重整(部分氧化)为温和的放热反应,其反应速率快、能耗低,特别适用于在线制取氢气或富氢气体。大气压非热等离子体为燃料氧化重整提供了一种应用前景广泛的新技术,展现了对燃料具有普适性、快速响应和反应器紧凑高效等优点。综述了大气压非热等离子体烃类燃料氧化重整反应器的研究进展,着重阐述了火花和滑动弧放电产生的暖等离子体及其烃类燃料重整反应器。与电晕和介质阻挡放电产生的冷等离子体反应器相比,暖等离子体反应器具有燃料转化率高和能耗低的优点。     

OPTIMIZATION OF DISPLACEMENT AND GLIDING PATH AND IMPROVEMENT OF PERFORMANCE FOR AN UNDERWATER THERMAL GLIDER

The underwater thermal glider utilizes ocean thermal energy to change its buoyancy, which enables it to ascend and descend. A Phase Change Material (PCM) as the working fluid inside the thermal engine tubes is sensitive to the surrounding seawater temperature, whose effects are different with the various displacements and gliding angles of the glider. In this paper, the effects of the displacement and the gliding angle on the performance of the thermal engine were studied numerically and experimentally. On this basis, the ways to eliminate the negative effect of a thermocline on the performance of the thermal engine were obtained. The results show that the displacement and gliding angle affect the transition time of the PCM. There exist the threshold values of the displacement and gliding angle for the normal work of thermal engine. There are two means of eliminating the negative effect of a thermocline on the performance of the thermal engine and improving glider performance: one is to increase the displacement, and the other is to decrease the absolute value of the gliding angle. There is also another better way to improve glider performance.     

Optimizing tape‐burnishing/wiping process of magnetic recording media through Taguchi method

For the ever‐increasing recording density in hard disk drives, ultra‐low gliding height media are required. It is an immense challenge for the tape‐burnishing/wiping process of media to reduce the asperities effectively and efficiently while no scratches occur. The purpose of this paper is to characterize and then optimize the tape‐burnishing/wiping process as so to minimize the asperities without leaving any scratches on the media surface. A Taguchi experiment design method is adopted to analyze the data and acquire an optimal level combination of process parameters. The resulting optimal combination is practically implemented in tape‐burnishing/wiping the several magnetic recording media, which reveals that the average pass ratio of 5 nm glide avalanche testing increases nearly doubly to a level of 96%. Copyright © 2008 John Wiley & Sons, Ltd.     

赣中安福煤田重力滑覆构造带变形岩石的显微构造研究

安福重力滑覆构造带中变形岩石的显微构造反映了:(1)该构造带变形的温压具有中间高两侧低的特点;(2)北缘滑覆带的三条断层变形的温压自北向南依次增高;(3)石英C轴组构具有“不完全小圆环带加点极密”的特点。这些证据说明了该区在近南北向应力作用下发生了多次重力滑覆。