Sonographic diagnosis of fetal congenital cataracts

Five fetuses with congenital cataracts diagnosed in utero by ultrasound are reported. The fetuses, who were between 14 and 27 weeks' gestation, also had other severe malformations. The sonographic features of the cataracts are presented.     

乌石化炼油厂污泥处理技术现状

介绍了国内外有关含油污泥的处理技术、以及乌石化炼油厂的三泥处理技术进展。     

Prenatal diagnosis of lethal osteogenesis imperfecta (OI) by ultrasonography

Ultrasonography was performed during the second trimester (17 weeks) in a pregnancy at risk for osteogenesis imperfecta congenita (OI). The scan showed that the femur was short, bent and dense. Radiologic examination of the fetus after interruption of pregnancy showed typical X-ray changes of OI.     

Hydrolysis kinetics of atrazine and influence factors

ＩｎｔｒｏｄｕｃｔｉｏｎＨｙｄｒｏｌｙｓｉｓｉｓｔｈｅｒｅａｃｔｉｏｎｏｆｃｈｅｍｉｃａｌｓｗｉｔｈｗａｔｅｒａｎｄａｌｓｏａｎｉｍｐｏｒｔａｎｔｅｎｖｉｒｏｎｍｅｎｔａｌｐｒｏｃｅｓｓｏｆｏｒｇａｎｉｃｐｏｌｌｕｔａｎｔｓ.Ｈｙｄｒｏｌｙｓｉｓｏｆｓｙｎｔｈｅｔｉｃｏｒｇａｎｉｃｃｏｍｐｏｕｎｄｓｏｃｃｕｒｓｖｉａｓｅｖｅｒａｌｐａｔｈｗａｙｓｗｈｉｃｈｉｎｖｏｌｖｅｔｈｅｓｐｅｃｉｆｉｃ ａｃｉｄ , ｂａｓｅａｎｄｎｅｕｔｒａｌｐｒｏｃｅｓｓｅｓ.Ｉｎａｄｄｉｔｉｏｎ ,ｗａｔｅｒｄｉｓｓｏｃｉａ…     

Membrane bioreactor process of organic wastewater from brassylic acid manufacturing plant

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｂｒａｓｓｙｌｉｃａｃｉｄｍａｎｕｆａｃｔｕｒｉｎｇｗａｓｔｅｗａｔｅｒｃｏｎｔａｉｎｓｈｉｇｈｃｈｅｍｉｃａｌｏｘｙｇｅｎｄｅｍａｎｄ(ＣＯＤ)ｃｏｎｃｅｎｔｒａｔｉｏｎ3000—12000ｍｇ/ＬａｎｄｉｔｓＢＯＤ5/ＣＯＤｉｓａｍｏｎｇ04—05Ｍｅａｎｗｈｉｌｅｔｈｅｗａｓｔｅｗａｔｅｒｃｏｎｔａｉｎｓｈｉｇｈｓｕｌｐｈａｔｅｃｏｎｃｅｎｔｒａｔｉｏｎａｂｏｕｔ13000ｍｇ/ＬａｎｄｉｔｓｐＨｖａｌｕｅｉｓｏｎｌｙ1—2Ａｃｈｅｍｉｃａｌｃｏｍｐａｎｙａｐｐｌｉｅｄｎｅｕｔｒａｌｉ…     

特殊结构(带支柱)球罐整体无模成形工艺的实验研究

为了解决无模成形方法成形大型球罐的困难,此文提出了一种特殊结构的壳体,该壳体在胀形前已将支柱焊在球瓣上,并且针对赤道带瓣对接焊处成形困难问题提出了一种减少瓣间两面角的特殊工艺方法.此文针对这种壳体的无模成形技术进行了实验研究,并对应变分布、直径变化及柱脚在不同摩擦条件下位移进行了测量分析,指出了此种壳体的无模成形技术是可行的,并具有良好的经济性,为大型球罐的无模成形制造提供了技术依据.     

Computational fluid dynamics applied to water and wastewater treatment facility modeling

The major issues in water and wastewater industry are to meet quality requirements, to guarantee treatment process efficiency, to contain investment and operating costs. This implies the use of powerful predictive modeling and simulation tools which are able to account for the multiple interaction between all the water quality and process design parameters. Computational Fluid Dynamics modeling tools have already been widely used in other industries but their application in water industry is quite recent. This paper presents different applications of CFD modeling to the study of the hydro-dynamic and mass transfer performance of single- or two-phase flow reactors used in water and wastewater treatment. Numerical simulations, together with experimental measurements, have been performed on laboratory and full-scale plants in order to gain a better under-standing of the physical phenomena (mixing, interfacial transfer) occurring in these systems. Numerical simulations are systematically validated by experiments. The paper shows how CFD can be helpful in order to improve the design of existing water treatment plants and the process efficiency. In this scope, CFD enables designs more reliable and cost effective water treatment processes which remain basic environmental policy issues.     

Photodegradation of alpha-naphthaleneacetic acid in aqueous solution.

Kinetic processes of alpha-naphthaleneacetic acid (NAA) photolysis were studied under different conditions. The results showed that the ultraviolet light was more effective than fluorescent light in promoting degradation, and the degradation of NAA under ultraviolet light followed the first order kinetics with the photolysis rate constant of 1.15 x 10(-2) min-1 and half-life time (t1/2) of 60 min. Further, it was proved that the photolysis rate was higher in the presence of oxygen, titanium dioxide (TiO2), and low pH (acidic solution). At last, two photolysis intermediates were identified by GC-MS and possible photolysis pathways were proposed.     

Effect of fuel oil and dispersant on cell cycle and macromolecular synthesis in the chlorococcal alga Scenedesmus armatus

Growth and reproductive processes in synchronous cultures of the alga Scenedesmus armatus (isolated from Baltic phytoplankton) were followed in the presence of various concentrations of dispersant DP-105, oil, and mixtures of oil and dispersant. The inhibition of protoplast fission was the most prominent effect of oil. Nuclear division was inhibited to a lesser extent. With an increasing concentration of oil, dispersant, or a mixture of both, the inhibitory effects were expressed earlier. The presence of oil compounds did not effect the timing of DNA replication, but it did reduce the number of replication rounds in a concentration dependent manner. The inhibition of DNA synthesis was accompanied by slightly delayed cessation of RNA and protein synthesis. Starch synthesis was always inhibited to a lesser extent, and at a later time, than other macromolecular syntheses. Pigment synthesis continued almost to the end of the cell cycle. Thereafter, a rapid degradation of all pigments began and the cells became bleached. No inhibitory effect on reproductive processes was found if oil or dispersant were added to cultures transferred into darkness. Furthermore, recovery from inhibition of reproductive processes caused by oil in continuously illuminated cultures was observed in darkened cells. Chemically dispersed fuel oil was only slightly more toxic than mechanically dispersed fuel oil; an additive, rather than synergistic, effect of oil/dispersant mixture was found.