—Review Paper—Current State-Of-The-Art Measurements Of Ozone In The Gas Phase And In Solution

This paper is a critical review and summary of the analytical procedures currently used by operating water utilities to control ozone treatment processes, considering disinfection as well as the many oxidative applications of ozone in water treatment applications. The role of common interferences in the various methods is described.

In operating U S., Canadian, European, and Japanese water treatment plants currently employing ozone as a primary disinfectant, ozone nearly always is followed by the addition of small quantities of chlorine, chlorine dioxide, or chloramine to provide the residual in the distribution system and to act as a secondary disinfectant. Clearly, the analytical procedures used must distinguish between the various species. This review critically presents these various factors and their implication with respect to “true values” of ozone determined under widely varying conditions.     

陶瓷磨光弧面板的开发与应用

研究了陶瓷板材在各种温度及压力下产生的应力、应变与板材断裂之间的关系和规律,提出了陶瓷板材的弯曲方法,研制各种专用试验、生产设备,将成品陶瓷平板加工成为园柱板、弧面、球面、圆锥面、双曲面等各种曲面板.     

Liquid Radial Dispersion in Liquid-solid Circulating Fluidized Beds with Viscous Liquid Medium

Liquid dispersion in the radial direction was investigated in the riser of a viscous liquid-solid fluidized bed 0.102 m in diameter and 3.5 m in height. Pressure fluctuations in the riser were also measured and analyzed to examine the behavior of fluidized particles. Effects of liquid velocity (0.15-0.45 m/s), solid circulation rate (2-8 kg/m²s), particle size (1-3 mm), and liquid viscosity (0.96-38 mPas) on pressure fluctuations and the liquid radial dispersion coefficient were determined. The infinite space model was employed to obtain the radial dispersion coefficient from the radial concentration profiles of the tracer. The pressure fluctuations were analyzed by means of autocorrelation coefficient as well as power spectral density function. The dominant frequency obtained from the autocorrelation coefficient or power spectral density function of pressure fluctuations decreases with increasing liquid viscosity or liquid velocity, but it increases with increasing particle size. The liquid radial dispersion coefficient decreases with increasing liquid velocity or viscosity, but it increases as the solid circulation rate or particle size increases. The liquid radial dispersion coefficient is related closely to the resultant behavior of fluidized particles. The radial dispersion coefficient has been well correlated with operating variables in terms of dimensionless groups.     

天然橡胶乳液压敏胶粘剂

本文介绍了天然橡胶胶乳压敏胶的基本情况，内容包括基本组成、主要优缺点和改进方法。     

板式空冷器导流板式液体分布器结构与流动规律研究

对导流板式液体分布装置的结构提出设计方法并进行了数学描述,推导得出了结构压降公式。采用CFX对该结构进行流场模拟,流场显示入口流体的分布。提出的结构设计方法和压降公式对于板式空冷器液体分布器的设计具有一定的理论指导意义。     

压力监测资料在注水开发油田的应用

合理的压力驱替系统对低渗透油藏的高效开发至关重要,而影响此因素的注水参数、注水方式及注采综合调控措施的选取则与注水开发过程中各项压力监测资料息息相关。王窑区是安塞油田最早注水开发的区块,在长达20多年的开发过程中,逐步形成了以压力监测资料为主,结合开发动态资料确定调整措施的经验和方法,对安塞油田开发具有十分重要的指导意义,也为低渗透同类油藏提供借鉴经验。     

基于分压配气和流量配气的隔爆型设备爆炸试验控制系统

综合分压配气和流量配气的特点和优势,设计了基于分压配气和流量配气原理的自动化配气控制系统,用于I类、II类隔爆型设备(d)和III类可燃性粉尘环境外壳保型设备(tD)的耐爆和传爆试验。经试验测试与比对:该系统可靠性、精确度、稳定性和重复性方面均满足GB 3836.2-2010防爆试验所规定的要求,并具有节省试验时间和试验气源的优点。     

橡胶冷喂料挤出机螺杆参数与机头压力实用数学模型的研究

运用正交回归试验方法，在Φ橡胶冷喂料挤出机实验台上，研究了螺杆主要参数（长径比，螺旋角，螺槽深度，螺杆几何压缩比）及主要挤出工艺、物性参数（螺杆转速、机头口型，胶料种类）对橡胶冷喂料挤出机机头压力的影响。对各实验因素及实验结果做了统计分析，确定了上述各因素对冷喂挤出机机头压力影响的显著因素，得出了机头压力与螺杆及工艺、物性参数之间的定量计算数学模型。     

Crosslinked acrylic pressure sensitive adhesives. 3. Effect of adherend on film formation

The reaction of isocyanate in pressure sensitive adhesive (PSA) films adhered on to various adherends having different surface tensions was monitored by depth profiling using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy.In the latter stages of crosslinking reaction, unreacted isocyanate and its derivatives exist more in the bulk of the PSA than in the interfaces between PSA and adherends which are Teflon sheet and PE film having relatively lower surface tensions. In the case of using stainless steel having relatively higher surface tension as adherend, opposite segregation was observed compared to Teflon and PE.From X-ray photoelectron spectroscopy (XPS), it was revealed that N atoms exist more in surface than in bulk when stainless steel is used as adherend. We conclude that polyisocyanates migrate in the PSA film in order to minimize the magnitude of interfacial free energy between the PSA and the adherend, which leads to the change of surface tension of PSA film.     

薄壁压力容器筒体纵焊缝角变形对应力的影响

提出压力容器简体纵焊缝产生角变形的模型。用简明的解析方法和有限元方法,探讨由变形引起的应力集中系数K_(ta)。结果表明,利用应力集中系数估算焊缝棱角对应力的影响是较合实际的,其公式为:K_(ta)=1+6E/S,式中E为棱角度,S为筒体壁厚。