日本油井管生产的最新发展

本文介绍了随着石油天然气开发环境的恶化，对油井管、输送管的耐腐蚀性提出了更高要求，国外使用不锈钢管的（１３％Ｃｒ钢）场合正在不断增加。日本从提高耐腐蚀性、生产率和降低成本考虑，开发了马氏体系ＨＰ３Ｃｒ不锈钢油井管和马氏体系１１Ｃｒ、１２Ｃｒ不锈钢管线管，并解决了不锈钢管难以轧制、工具寿命短等工艺及设备问题。日本近几年的不锈钢管的发展方向，可作为今后我国发展石油工业专用管时的参考。     

天津钢管集团公司大口径管线管首次进入塔里木油田

日前,集团公司大口径Ф457mm×17．5mmL415QB管线管,完成生产并陆续发往塔里木油田。这是集团公司大口径管线管首次进入塔里木油田,标志着该产品已获得油田的认可,并为进一步推广起到促进作用。     

酸性服役管线管BNS力学及耐腐蚀性能研究

文章介绍了包钢钢管公司酸性服役管线管BNS成分设计要求,对材料的拉伸性能、冲击性能、组织以及耐腐蚀性能进行了检测和分析,正火处理后,材料具有良好的力学性能和抗腐蚀性能.试验结果表明,设计的BNS完全能满足酸性服役条件下管线管性能要求.     

宝钢16．66mm厚壁管线管成功批量生产

南宝钢分公司钢管厂生产的1400t直径406．4mm、壁厚16．66mm的X52HFW（中口径直缝焊接）厚壁管线管近日发往用户。经检验，技术性能指标全部达到标准要求。该产品的批量生产，不仅填补了国内空白，而且使宝钢中口径直缝焊管向厚壁管线管迈出了一大步。     

集输管线管L360QS的焊接性能试验研究

在选定焊接方法、焊接材料和工艺参数条件下,进行了L360QS管线管试样焊接和接头性能评价试验。结果表明,L360QS管线管具有良好的可焊性,焊接接头具有优异的抗腐蚀性能,选用的焊接材料和工艺参数可用于该种材料管道的现场焊接。     

X90大口径UOE焊管的开发研究

采用热—力模拟试验技术和试验轧制方法,研究了X90高强度管线钢形变奥氏体动态连续冷却转变特性以及工艺性能关系,并以此为基础进行了X90管线钢板和大口径焊管的工业试制.结果表明,通过采用低碳、高锰及微合金化的成分设计方法和优化的控轧控冷厚板制造工艺,可制造以细化低碳贝氏体为组织特征、具有高强度和高韧性的X90管线钢板.结合合适的UOE成型及焊接工艺,试制的φ1 219×16.3 mm、φ1 219×19.6 mm规格X90大口径UOE焊管同样具有优异的强度、塑性和韧性匹配,管体横向均匀延伸率达到4.5％以上,-10C管体冲击功达到300 J以上,0℃ DWTT剪切面积达到90％以上,且具有较好的焊缝质量,各项性能指标均满足第44版API 5L标准要求.     

海底管线管X56 PSL2的研制

 从化学成分设计、冶炼连铸工艺、热轧工艺等方面对海底管线管X56 PSL2进行了研究,并且在衡管进行了海底管线管X56 PSL2的工业试制,满足了油田用户对海底管线管X56 PSL2的需求。实践证明,衡管的工艺方案,满足和适应了油田用户的需要。海底管线管X56 PSL2的研制成功,为衡管生产低碳微合金化高强度管线提供了生产经验,并具有指导作用。     

一季度美国不锈钢出口略有上涨

从美国商务部最近公布的一份出口数据中获悉，2008年第一季度美国出口不锈钢12760吨，与去年同期相比上涨3个百分点。不锈钢油井管以及管线管出口量猛增，分别由2650吨及2230吨上涨至9414吨及7100吨。不锈钢剪切板出口量相比去年同期的16760吨下降35个百分点跌至10840吨，     

铝线杆连铸连轧机组安装中的问题及解决办法

在铝线杆连铸连轧机组安装过程中，通过对铸机张紧轮与结晶轮高精度的安装、铸机排水系统设计、轧机短路环的安装及粘辊问题的解决以及引线管与甩线管部分的改造，保证了机组的安装质量和产品质量。     

Rate of electrochemical formation of nanoclusters

The electrochemical formation of nanoclusters is considered. The classical thermodynamic and atomistic theories of nucleation are compared. A version is proposed for the atomistic approach of the theory that is suitable for the region of high supersaturations (overvoltages). The concept of the critical cluster of a new phase is analyzed. A method for determining the number of atoms in the critical cluster of a new phase during electrolytic crystallization is suggested.     

载金炭解吸电解工艺方法的分析比较

对近二十年来载金炭解吸电解工艺的三种方法进行了比较，即第一种加温常压解吸电解方法，尽管解吸时间比第二种高温高压解吸电解方法时间长，生产效率低，但由于其设备投资少，成本低，目前仍可适用于小型黄金矿山；采用第二种方法具有生产能力大，解吸效果好等许多优点，比较适用于大，中型黄金矿山；而第三种解吸电解方法介于前二种之间。     

An automated study of EEG: a method of detection of non-stationary points

The purpose of this paper is to present an automatic method of signal analysis. To help physicians in their diagnostics, this method is implemented on a minicomputer in order to detect non-stationary points in electroencephalograms. The signal is modelled with an autoregressive filter. The parameters of this filter are adapted at each step. Identification gives the best model in the sense of a cost function representing the mean square error of noise, which is estimated during the optimisation time-window. The cost function is expressed by a quadratic formula. This allows the use of a fast algorithm, the 'conjugate gradient method'. An original statistical test is developed to detect non-stationary points in the signal. The performance of this method is tested with artificial data to determine the sensitivity of method parameters. Detection using real data is presented.     

低品位褐铁矿的磁化焙烧

针对河北宣化某难选褐铁矿石,采用SEM和XRD对原矿物性结构及成分进行了分析,并运用磁化焙烧-磁选工艺进行了实验研究并对磁化焙烧-磁选工艺参数进行了优化。物相分析结果表明,该褐铁矿与脉石矿物的镶嵌关系较为复杂,SiO2含量高,运用常规的选矿方法难以分选提纯。实验结果表明,磁化焙烧-磁选工艺可以较好地完成该铁矿石的提纯。对该褐铁矿原矿在焙烧温度为950℃,焙烧时间为15min,配煤量为5%,焙烧矿粒度为150μm和磁场强度为60mT的条件下,可以得到精矿产率为43.68%,铁精矿品位为53.98%,铁回收率83.91%,wSiO2为13.9%的良好指标。     

ICP-AES法测定混合稀土金属中硅量

主要研究了采用ICP-AES法测量混合稀土金属中的硅含量.进行了分析谱线的选择,干扰实验.方法的检出限为0.022mg/l,回收率为95%～105%,RSD为1.83%～2.56%.方法准确、快速、简便.     

Use of the spiral pin for fracture of the humeral neck

Our new method of intramedullary fixation of humeral neck fracture is described. Spiral pin is made of stainless steel. The top is coiled, and the end is threaded. It is inserted from a small incision over the posterior surface of the supracondyle. It is passed across the fracture site into the head of the humerus, where it locks the head. The fracture surface is pressed together by tigtening nuts. The fracture fixation allows early movement of the shoulder joint. The method was used in eight patients. The average age was one-year-old.     

高炉煤气干法除尘系统除盐研究

通过燃烧部分高炉煤气从而加热进入透平机的煤气温度,从而减少或杜绝TRT透平机内积盐,最后在TRT出口处通过煤气洗涤塔将酸性气体除掉。该方法同时具有提高TRT发电量作用。     

Ultrastructure of the salivary bladder of the nine-banded armadillo

The nine-banded armadillo possesses a salivary bladder which is a dilated portion of the main duct of the submandibular gland at its origin. The wall of the bladder is composed of an epithelium, a submucosa and a thick coat of skeletal muscle. The ultrastructure of the epithelium reveals that it is complex and consists of three cell types: 1) principal cells, 2) light cells, and 3) basal cells. The general organization of the epithelium suggests that it is a transporting type of epithelium such as that found in the amphibian and reptilian and reptilian urinary bladders and the mammalian gall bladder. The submucosa is composed primarily of densely-packed collagen fibers. The skeletal muscle is very vascular and richly innervated.     

浅论电液比例阀在长机列铝材生产线纠偏控制系统中运用的优势

以西南铝1600mm彩色涂层生产线进口的纠偏对中系统为例，进行电液比例阀控制系统代替常用的电液伺服阀控制试验，达到同样精度，实现了控制系统国产化，解决了原系统高维修成本问题，取得了较好的企业经济效益，为长机列铝材生产线提供了技术改造经验。     

Analysis of Effect of Gas Temperature on Cooling Stave of Blast Furnace

In order to study the effect of gas temperature variation on cooling stave,temperature,stress and displacement distributions of cooling stave were analyzed respectively when gas temperature inside blast furnace increases from 1000 to 1600℃.The results show that the temperature field on cold side is under control of cooling pipes and hardly changes when gas temperature increases.The temperature gradient and change rate with time near hot sides are greater than those in other regions and the later can reach 100℃/s.The stress intensity near middle area of hot surface is up to 400MPa and that's why there are lots of cracks at this place.The edge of stave is bent to cold side and middle regions between fixed bolts and pin moves to hot side.The displacement around fixed pin is smaller but larger on the edge and the maximum is located on hot side of top surface.The maximum displacement in z direction is about 4mm and 3mm in y direction.If the expansion coefficient of packing layer is 1/4,the thickness of packing layer between the cooling staves is 32mm and 24mm between sides up and down.