高压定喷灌浆工艺在张铁水库除险加固工程中的应用

本文介绍了青海省民和县张铁水库大坝坝基采用高压定喷灌浆法形成防渗帷幕进行防渗处理的具体施工工艺。     

高压定喷灌浆工艺在张铁水库除险加固工程中的应用

本文介绍了青海省民和县张铁水库大坝坝基采用高压定喷灌浆法形成防渗帷幕进行防渗处理的具体施工工艺.     

高压旋喷桩在深基坑止水帷幕中的应用

本文结合工程深基坑支护结构的项目实例,介绍了三重管高压旋喷桩作为止水帷幕的工作原理、施工工艺与质量控制措施。     

高压旋喷桩防渗技术在卵石混砂土层中的应用

在卵石土层中施工止水帷幕是岩土和水利工程界的难点,高压旋喷桩防渗墙由于在经济性和适应性上具有相对优势,取得了一定数量的试验和应用经验,仍然面临着各种问题。在福建省福清市倪松拦河闸工程中,笔者成功地在卵石混砂土层中使用三管法高压旋喷桩对基坑、围堰进行防渗、止水,达到了预期的设计效果,为高压旋喷桩桩处理类似技术提供了经验和参考。     

浅析建筑基坑工程中旋喷桩施工技术的应用

本文结合笔者多年工程实践经验,针对旋喷桩施工技术的应用优势,对旋喷桩施工技术在建筑基坑工程中的应用和施工技术要点进行了分析。希望能给同行参考借鉴!     

浅谈旋喷桩施工技术在建筑基坑工程中的应用

随着建筑高层和超高层的不断涌现,基坑边坡的支护成为了施工中的难点.本文主要分析了旋喷桩技术施工前准备工作,施工工艺主要控制点和主要技术控制要点,希望能为业内同行提供一定的参考.     

旋喷桩在深水施工中的应用

文章对旋喷如何在深水施工中的应用问题进行了阐述。     

关于旋喷桩施工技术在盾构端头加固工程中的应用研究

盾构端头的加固是盾构始发、到达的一个及其重要的组成部分,在盾构施工过程中,洞门塌方事故时有发生,端头加固的成功与否直接影响到盾构能否安全始发、到达。基于此,本文结合某工程盾构端头加固工程实践,就盾构端头土体加固的施工要点进行了探讨,可供同行参考。     

The effects of 2 levels of the inspired oxygen fraction on blood gas variables in propofol-anesthetized dogs with high intracranial pressure

The influence of 2 different levels of the inspired oxygen fraction (FiO₂) on blood gas variables was evaluated in dogs with high intracranial pressure (ICP) during propofol anesthesia (induction followed by a continuous rate infusion [CRI] of 0.6 mg/kg/min) and intermittent positive pressure ventilation (IPPV). Eight adult mongrel dogs were anesthetized on 2 occasions, 21 d apart, and received oxygen at an FiO₂ of 1.0 (G100) or 0.6 (G60) in a randomized crossover fashion. A fiberoptic catheter was implanted on the surface of the right cerebral cortex for assessment of the ICP. An increase in the ICP was induced by temporary ligation of the jugular vein 50 min after induction of anesthesia and immediately after baseline measurement of the ICP. Blood gas measurements were taken 20 min later and then at 15-min intervals for 1 h. Numerical data were submitted to Morrison’s multivariate statistical methods. The ICP, the cerebral perfusion pressure and the mean arterial pressure did not differ significantly between FiO₂ levels or measurement times after jugular ligation. The only blood gas values that differed significantly (P < 0.05) were the arterial oxygen partial pressure, which was greater with G100 than with G60 throughout the procedure, and the venous haemoglobin saturation, that was greater with G100 than with G60 at M0. There were no significant differences between FiO₂ levels or measurement times in the following blood gas variables: arterial carbon dioxide partial pressure, arterial hemoglobin saturation, base deficit, bicarbonate concentration, pH, venous oxygen partial pressure, venous carbon dioxide partial pressure and the arterial-to-end-tidal carbon dioxide difference.     

The effect of proteinase inhibitors in rats. 1. Report. Effect of a short-term application on the N balance, the free amino acids in liver and muscles and the biological half-life of the intestinal tissue proteins]

Short-term trials with a triazin derivative and a peptide aldehyde were carried out to investigate the in-vivo administration of proteinase inhibitors in rats for improving the N balance of the animals. The results of N balances suggest that the peptide aldehyde may be regarded as a promising substance that may be used to increase the rate of utilization of the absorbed N in the intermediary metabolism. The short-term use of both active compounds did not affect the true N digestibility. The two compounds did not influence the concentration of free amino acids in the liver and muscle tissue under the experimental feeding conditions used. Similarly, tests of the biological half-life of proteins taken from the small and large intestine did not reveal any changes due to the presence of the inhibitors. Animals receiving a protein-free diet exhibited longer half-life periods for proteins from the small and large intestine compared with animals of the other groups. A protein-free nutrition of the animals caused a general increase in the levels of free non-essential amino acids in the liver. This was accompanied by a simultaneous decrease in essential amino acids. The same type of nutrition led to a general decline in the concentration of free amino acids in muscular tissue, particularly of the essential amino acids. High-protein nutrition led especially to an increase in the concentration of branched-chain amino acids in both types of tissues investigated.     

“九五”国家科技攻关专题“猪优质高效配合饲料产业化关键技术的研究”通过

由中国农业大学动物科技学院李德发教授主持,广东省农业科学院畜牧研究所、中国农业科学院畜牧研究所、重庆养猪科学研究院、华南农业大学畜牧系、四川农业大学动物营养研究所、东北农业大学食品科学学院、湖南正虹饲料有限公司、湖南唐人神集团、山东六和集团、广东恒兴实业集团公司参加的“九五”国家科技攻关专题“猪优质高效配合饲料产业化关键技术的研究”日前通过了农业部组织的专家组验收。 该专题是在前3年“猪预混料配方技术研究”的基础上,组装集成“七五”以来我国饲料营养的研究成果,以预混合饲料为核心,以配合饲     

Effect of iodine, copper and zinc supplements to rations with a high quota of rapeseed extract meal on the growth and thyroid function of fattening swine. 3. The effect on weight and the histomorphometric findings in the thyroid and on the serum T3 and T4 concentrations

Studies were made with a total of 272 fattening pigs. Iodine deficiency both in rations of soya bean meal and rape seed meal increased the weight of the thyroid gland and the height of the epithelium cells and significantly reduced the T4 and T3 level in the serum. Iodine supplements to the rape seed meal rations distinctly diminished the goitrogenic effect, did not, however, cancel it out. Stage of goiter and depression of consumption were--different shown by the T3 and T4 level in the serum. Highly significant relations were calculated between live weight gain, weight and the height of the epithelium cells on the one hand and the T4 level in the serum on the other. Iodine supplementations of rations without thyrostatic components should amount to greater than or equal to 0.1 mg/kg. Iodine supplementations of 0.5 mg/kg feed are at present recommended to rations with rape seed meal quotas of less than 8%.     

The occurrence of Fusarium varieties and their mycotoxins on silo corn. 1. A method for the determination of zearalenone in corn and corn silage by high performance liquid chromatography (HPLC) with fluorescence detection

A method for the determination of zearalenone in maize and maize silage was developed which distinguishes itself by the effective and fast cleaning of the extracts with the help of a silica gel minicolumn. The samples were extracted with chloroform/methanol (9 + 1) and cleaned on a silica gel minicolumn after acid-base partition. The zearalenone was quantitatively determined optionally by means of high-performance liquid chromatography (HPLC) with fluorescence detection (excitation wavelength 236 nm, emission filter 418 nm) or thin-layer chromatography (TLC), p-methoxybenzene diazonium fluoroborate and aluminium chloride were used as detection chemicals. The limits of detection are 0.01 mg/kg (HPLC) and 0.1 mg/kg resp. (TLC), the average recovery is 81%. The method was used for the determination of zearalenone in grain maize, CCM silage and silage from whole maize plants.