长江中下游鹅头型汊道演变规律的分析

鹅头型分汊是长江中下游城陵机至江阴分汊河段中形最复杂、放宽率最大，分汊数量多，占汊道总长度最大（达40％）的一种分汊形式。其演变主要于本身的河床形态，边界条件及水流条件的变化，基本上遵循新生汊道－产生、扩大、平移、衰亡而完成它一个完整的演变周期。由于汊道的弯曲引起滩地的大面积坍失，主流线大幅度摆动，各汊道水沙的重新分配及纵横剖面的调整，是一种最不稳定的分汊型式，对鹅头型分汊河道的形成条件及演变特征的研究是制订相应的规划整治措施，稳定河势，使其朝着有利的方向发展的前提条件，也是实际工程迫切要求解决的问题。     

实施SY/T6143──1996标准的说明

在国家石油天然气行业标准SY/T6143—1996“天然气流量的标准孔板计量方法”颁布后，该标准代替SY104—83标准，凡使用标准孔板测量天然气流量均应按该标准实施。由于目前现场绝大多数的计量点配用的二次仪表为CW—430双波纹差压流量计、水银温度加求积仅、计算器并采用人工求积计算，要严格按该标准实施有一定难度，本文说明了我国目前天然气计量现场标准孔板配用的两种二次仪表的三种计算处理办法，特别重点介绍配用CW－430双波纹差压流量计水银温度计加求积仅，计算器的室内、现场的变通化简处理办法。     

The Investigation on the Microstructure of Metallurgical Molten Slags and the Foundation of the Primary Cluster Theory

This paper presents the characteristics of the properties of metallurgical molten slags based on the bond structure or the existence of certain ion clusters. Some experimental and theoretical approaches were adopted in the investigation. Two sets of high temperature Raman spectroscopy (HTRS) were established at Shanghai University; both can be successfully operated at 2000K or higher. One of them combines the accumulated time resolution together with the spatial resolution, and it is designed for both ultraviolet (UV) and visible (VIS) light. The SiOT model uses 5 kinds of Si‐O tetrahedra (Q_n) as microsturctural units. In this model, each sample contains 250000 or more tetrahedra. The calculation using a GF matrix and electro‐optical parameter (EOP) methods were performed for every tetrahedron one by one to determine the partial Raman spectra of Q_n. Then the spectra were integrated to obtain an envelope of the sample. In addition to the SiOT model, a CEMS model was also developed to link the ion cluster structure and the thermodynamic properties at equilibrium (as mixing free energy).     

液氯钢瓶失效分析

本文在充分调研和试验基础上,对几十个判废的液氯钢瓶进行了综合分析,并结合试验测试数据和理论计算,对液氯钢瓶的失效方式进行了分类总结,对判废标准做了若干探讨,为钢瓶的安全、合理使用提供了依据。     

浅谈余热锅炉隔热耐火衬里冬期施工解决方案

主要介绍了隔热耐火衬里5℃以上环境施工,15℃-25℃养生和80℃-120℃低温干 燥窑烘干的方法,同时解决冬期余热锅炉的生产问题。     

Reduction of lipid peroxidation and H2O2‐mediated DNA damage by a red alga (Grateloupia filicina) methanolic extract

The antioxidant activity of an extract of Grateloupia filicina was evaluated using linoleic acid and fish oil as substrates in an induct period at 65 °C. Furthermore, the algal extract was subjected to comet assay to evaluate its protecting ability for H₂O₂‐induced DNA damage in rat lymphocytes. Progression of oxidation was examined using weight gain, peroxide value (PV), 2‐thiobarbituric acid reactive substances and conjugated diene data. Effectiveness of the extract at 0.03 and 0.05% levels was superior to that of α‐tocopherol at 0.01% and the activity of 0.05% extract was higher than that of butylated hydroxyanisole and butylated hydroxytoluene at 0.01%. Also, the algal extract significantly inhibited H₂O₂ induced DNA damage in comet assay. The maximum DNA damage inhibition (68.9%) was recorded from the 50 µg ml⁻¹ alga extract when the rat lymphocyte cells were treated with 50 µM H₂O₂. Copyright © 2005 Society of Chemical Industry     

关于加强油气田开发研究风险论证的思考

加强风险论证是实现油气田开发决策科学化的基础和前提。通过总结多年来进行风险论证的经验和体会,就海上油气田开发研究中加强风险论证的必要性、内容以及建立风险论证责任制进行探讨。     

针对一阶惯性加纯滞后过程的模型算法控制研究

针对典型的工业一阶生产过程,采用单值模型算法预测控制,完成了基于PLC的单值模型算法预测控制器的设计,并以过程控制装置为对象,以流量为被控变量,实现了单值模型算法预测控制.实验表明系统控制精度高,抗扰性强,取得了实际误差小于0.01 m3/h的控制效果,运行稳定,具有一定的实用性和推广性.     

机载SAR发展概况

机载SAR具有提供高分辨率成像的能力，这种能力不受气象条件和太阳照射的限制，因此得到了广泛应用。本文简要说明机载SAR的特点，主要介绍世界上一些机载SAR的现状、性能及主要参数。根据机载SAR发展过程及现状，讨论机载SAR的发展趋势。