渠道输水过程中的节水工程措施——渠道防渗技术

灌溉渠道在农业发展中作用是非常大的,对促进农业发展有着积极的意义,但是灌溉渠道在输水的过程中会出现大量损失情况,这样对水资源来说是一种非常严重的浪费情况。渠道灌溉出现的水量损失主要是渗漏损失,因此,针对这个情况可以在进行渠道建设的时候采取一定的措施,这样不但可以保证渠道不出现渗漏的情况,同时也能促进灌溉渠道获得更好的发展前景。     

建筑外墙防渗漏的施工控制措施

随着我国建筑行业的快速发展,建筑技术也在不断的更新,但是在建筑过程中出现的问题也是层出不穷的,在砌体工程中就容易出现外墙渗漏的现象,一旦出现渗漏,其产生的原因是很不容易找出来的,所以必须加强对施工过程中的技术监管。本文主要阐述了建筑外墙渗漏的原因及具体的解决方法和措施。     

水利工程中防渗施工技术的应用

对于水利工程来说,最容易出现的问题、难点和挑战就是施工过程中以及使用阶段出现的渗漏问题。渗漏问题严重的影响了水利工程的施工质量。它的形成有很多种原因,所以防渗问题就成了重要的技术性问题。文章将通过概括和介绍施工中渗漏问题形成的原因,来具体论述防渗工程中的几大关键技术和应用。     

浅析工民建中的防水防渗施工技术

工程中的质量好坏往往在我们眼中都是最重要的,同时这也关系到企业在整个行业中竞争的优势。但是房屋的渗漏方面在整个建筑的过程中是影响整体质量的一个重大因素,这对于建筑来说是投入使用的阻碍,同时这也对自身的利益与企业的利益带来的阻碍。因此,就施工团队来说,对于房屋的防渗漏技术的要求会很高,这样能够提高其总体质量,往往这都是工作中最重要的地方。这篇文章就工民建筑中的渗漏防漏的技术进行深入的研究与分析。     

建筑物外墙渗漏原因分析及预防措施

外墙渗漏是最近几年广大房屋业主反映十分强烈的一个建筑质量通病,给居民的正常生活和使用造成了很大的不便。一直困扰着施工企业。引起外墙渗漏的原因有很多,且外墙渗漏也不同于其它建筑质量通病处理起来比较容易,一旦出现外墙渗漏,处理起来十分棘手,很难彻底根治。为此,本文就外墙渗漏的原因与防治和措施进行探讨。     

浅析农村小型水利工程中的防渗方法

水利工程是我国重要的基础建设项目,对于农村经济发展和生产生活有着重要影响,而农村小型水利工程受到很多条件的限制,很容易出现各种渗漏、渗水问题,严重影响水利工程的使用性能和使用寿命。因此,应采取有效地防渗方法,保障农村小型水利工程的正常运行。文章分析了农村小型水利工程的渗漏原因,阐述了农村小型水利工程的防渗方法,以供参考。     

水利工程渠道防渗施工技术的有关分析

随着我国水利事业的发展与进步,防渗漏的问题逐渐受到了重视,其在水利施工的建设中也有着广泛的应用,该技术也在一定程度上影响到了水利工程施工的质量,这就要求相关部门对其进行重视。文章主要对水利工程中的防渗漏技术进行研究,并对其在工程中的有关应用进行研究与分析,以此来提高防渗漏施工的质量,从根本上加强水利工程的建设与完善。     

防渗漏技术在建筑工程中的应用探析

在建筑工程中,如果防渗处理不当,常常容易出现渗漏问题,因此,我们应该高度重视防渗施工技术,切实做好防渗施工处理。文章就防渗漏技术在建筑工程中的应用进行探析,旨在相互交流防渗技术,不断提高防渗漏施工技术水平。     

小议建筑工程中的防渗漏技术

最近几年,防渗活动受到了人们的普遍关注。相关的处理技术也得到了显著的发展。对于我们国家的建筑项目建设工作来说,屋面和墙体以及其他位置的渗漏现象是要高度的关注的。文章论述了防治外墙渗漏的措施等内容。     

浅议市政给水管道沟槽开挖及回填问题

市政给水管道是城市最重要的基础设施之一,给水管道的施工质量对于城市供水安全性有着重要的影响,管道施工质量不过关,容易导致城市管道渗漏乃至自来水管爆管等现象,影响市民的正常用水。市政给水管道沟槽的开挖及回填,作为管道施工的重要内容,对管道的整体施工质量和施工成本影响也较大。文章简要探讨市政给水管道沟槽的开挖及回填问题。     

喷气织机中压缩空气的泄漏评估及其修复优化

为探究喷气织机中压缩空气泄漏情况,以便对泄漏原因及参数影响进行评估,在织布车间从喷气织机引纬系统入手,对输送及使用过程中的压缩空气进行泄漏检测。结果发现,泄漏主要来源于管路输送、连接附件以及使用点设备3 方面,原因主要为使用过程中零部件老化及破损而没有及时修复更换。数据分析表明,压缩空气在使用过程中泄漏量、能耗随压降及温度变化的增加而增大。通过实验、数值及理论分析相结合揭示了压缩空气在喷气织机中泄漏情况及压降、温度等因素的影响机制。以此为基础,对泄漏进行了探讨并提出了修复优化。结果表明,通过对喷气织机引纬专件定期管理维护、检修保养,可有效减少甚至消除泄漏,从而达到降耗要求。     

乳酸菌细菌素Durancin GL对单增李斯特菌的抗菌活性及机制

单增李斯特菌广泛分布于肉类、禽类、蛋类、乳制品及蔬菜中,且适应能力强,即使在4 ℃的冷藏环境下仍可生长繁殖,是食品中主要的食源性致病菌之一。乳酸菌细菌素Durancin GL是由干酪中肠球菌产生的一种新型细菌素,对单增李斯特菌具有靶向抑制作用。本实验研究了Durancin GL对单增李斯特菌的抗菌活性及作用机制。通过最小抑菌浓度和抑菌动力学实验检测Durancin GL对单增李斯特菌的抑制作用,结合监测胞内物质泄漏、菌体存活情况以及形态学分析,探讨Durancin GL对单增李斯特菌的抑菌机制。Durancin GL对单增李斯特菌最小抑菌浓度为（2.5±0.4）mg/L,可引起李斯特菌细胞质泄漏,增加细胞外液电导率,导致菌体细胞死亡,从而发挥其抑菌活性。     

Milk lipoprotein lipases: a review.

Lipoprotein lipase activity has been found in the milks from severals species where it is assumed to result from leakage from the mammary gland into milk. The function of the enzyme in the gland is apparently to assist in the transfer of blood lipoprotein triacylglycerol fatty acids into milk triacylglycerols. Bovine skim milk is one of the richest sources of lipoprotein lipase and this enzyme has been purified extensively (7000 fold) by affinity chromatography. The lipase has a molecular weight of about 62000, is inhibited by protamine sulfate, 1.0 M sodium chloride, apolipoprotein C-I (apolipoprotein-serine), and apolipoprotein C-III (apolipoprotein-alanine). The enzyme is activated by apolipoprotein C-II (apolipoprotein-glutamic acid), serum, and by heparin to which it also binds. The lipase is highly specific for the primary esters of acylglycerols and exhibits a slight stereospecificity for the sn-1 ester in preference to the sn-3-ester. Bovine milk also has separate activity toward 1-monoacylglycerols. Human milk contains a serum stimulated lipoprotein lipase with many of the characteristics of the enzyme in bovine milk, as well as an enzyme stimulated by bile salts which resembles the sterol ester hydrolase of rat pancreatic juice. The assay, function, purification, characteristics, and substrate specificities of these enzyme are discussed.     

浅谈盐卤生产老区定向对接井的施工

在盐矿山生产老区,井下盐层溶腔已经大面积连通,部分顶板出现垮塌,区域内孔隙发育地层已经与盐腔产生通道,因此在这种区域内钻井施工时,极易在盐层顶板附近发生井漏、井涌等突发性事故。罗60井则为一次成功的施工经验。     

Physiological and Genetic Properties of Tomato Fruits from 2 Cultivars Differing in Chilling Tolerance at Cold Storage

ABSTRACT:  Postharvest tomato fruits are cold-sensitive, and easy to develop chilling injury (CI) at cold storage. Information on physiological and genetic characteristics closely related to CI is necessary because it is significant to realize CI development regular and find sensitive indicators reflecting cultivar cold tolerance, which are the basics to prevent CI. In this study, we used 2 tomato cultivars (Lichun and Santiam) differing in cold tolerance to analyze ion leakage, malondialdehyde (MDA), proline, catalase (CAT), and peroxidase (POD) in postharvest fruits chilled at cold storage. Expression of cold-response gene LeCBF1 , a key regulator in cold-response, was also detected. Results showed that ion leakage, with a high correlation coefficient (0.9661) to CI index, exactly reflected injury development phase and degree; sharp increase of MDA and proline content appeared at and before the time of main development phase of CI (10 d); however, fluctuant CAT and POD activities could not sensitively reflect CI development, since their regular changes didn't appear until the main development phase ended. Thus, ion leakage, MDA, and proline content were effective indicators for CI analysis in postharvest tomato fruits. Although physiological analysis was effective in CI analysis, it was complex to be used in judging cold tolerance. Expression of LeCBF1 gene swiftly responded to low temperature within 1 h. In accordance with those physiological parameters, LeCBF 1 expression level was positively correlated with cold tolerance and showed a high correlation to CI index (−0.9176). These suggested that LeCBF1 analysis could be effectively used in fast testing the cold tolerance of tomato.     

CO2 modeling in a deep saline aquifer: a predictive uncertainty analysis using design of experiment

When field data are limited, stratigraphic models are used instead of detailed, fully heterogeneous models (FHM) to represent deep saline aquifers in numerical simulations of CO2 storage. This study evaluates parameter sensitivity and prediction uncertainty of three stratigraphic models of decreasing complexity (i.e., facies, layered, formation) against that of a FHM. For select simulation outcomes (i.e., CO2 mass profiles, gas plume shape, brine leakage), parameter sensitivity and associated prediction uncertainty are compared among the models, with the FHM serving as a reference. The analysis is conducted using the computationally efficient design of experiment (DoE) and response surface (RS) methodology. Results suggest that when a competent caprock exists (permeability <1 × 10(-4) mD), the facies and layered models are capable of capturing the most important sensitivity parameters of the FHM, that is, residual gas saturation, heterogeneity variance, and salinity. Using the important parameters identified by DoE, RS modeling then suggests that the same two models also capture the ranges of predictions in mobile gas, trapped gas, and brine leakage. The formation model is less accurate in capturing the sensitivity and prediction ranges of the FHM, although it is accurate in predicting brine leakage into the overlying formation.     

A case study to detect the leakage of underground pressureless cement sewage water pipe using GPR, electrical, and chemical data

The exploration and determination of leakage of underground pressureless nonmetallic pipes is difficult to deal with. A comprehensive method combining Ground Penetrating Rader (GPR), electric potential survey and geochemical survey is introduced in the leakage detection of an underground pressureless nonmetallic sewage pipe in this paper. Theoretically, in the influencing scope of a leakage spot, the obvious changes of the electromagnetic properties and the physical-chemical properties of the underground media will be reflected as anomalies in GPR and electrical survey plots. The advantages of GPR and electrical survey are fast and accurate in detection of anomaly scope. In-situ analysis of the geophysical surveys can guide the geochemical survey. Then water and soil sampling and analyzing can be the evidence for judging the anomaly is caused by pipe leakage or not. On the basis of previous tests and practical surveys, the GPR waveforms, electric potential curves, contour maps, and chemical survey results are all classified into three types according to the extent or indexes of anomalies in orderto find out the leakage spots. When three survey methods all show their anomalies as type I in an anomalous spot, this spot is suspected as the most possible leakage location. Otherwise, it will be down grade suspected point. The suspect leakage spots should be confirmed by referring the site conditions because some anomalies are caused other factors. The excavation afterward proved that the method for determining the suspected location by anomaly type is effective and economic. Comprehensive method of GRP, electric potential survey, and geochemical survey is one of the effective methods in the leakage detection of underground nonmetallic pressureless pipe with its advantages of being fast and accurate.     

姜黄油的抑菌活性及抑菌机理

本文通过测定姜黄油对枯草芽孢杆菌、蜡样芽胞杆菌、藤黄八叠球菌和沙门氏菌的抑菌圈及最低抑菌浓度(MIC),对其抑菌效果进行了评估,并通过测定4种供试菌的菌体形态、生长曲线、电导率变化、内容物的渗漏情况等方面,对姜黄油的抑菌机制进行了初步的探究。结果表明,姜黄油对4种供试菌均有抑菌效果,对沙门氏菌的抑菌效果最好,其抑菌圈为15.3 mm,MIC值为0.4 μL/mL,其次是枯草芽孢杆菌、蜡样芽胞杆菌和藤黄八叠球菌;扫描电镜图显示,姜黄油使菌体外部出现损伤,细胞形态破损严重,影响了菌体细胞膜的通透性,造成小分子物质泄漏;姜黄油对4种供试菌的生长均有明显的抑制作用,并且呈剂量依赖关系。经1 MIC姜黄油处理的4种供试菌,其细胞膜结构被破坏内容物泄露,电导率明显增加,同时培养基中蛋白和还原糖的含量也明显增加,使OD₂₆₀(核酸)的值也明显升高。综上所述,姜黄油的抑菌机理可能在于破坏微生物的细胞膜结构,引起内容物泄漏,导致菌体凋亡。     

盒中袋在餐饮食用油包装中的应用市场分析

中国餐饮油主要使用铁罐和PET瓶进行包装,存在着非法灌装严重、保质期有限、成本高等问题。文章综述了盒中袋(BIB)的结构、用于餐饮油包装的优势、目前存在的缺陷和问题、运用于餐饮油包装的市场前景。BIB已广泛应用于多种液体产品的包装,在餐饮食用油上具备节约原材料、节省成本、提高保质期、杜绝地沟油等作用。目前,由于中国技术水平的限制,BIB在实际应用中还存在着灌装中瓶盖压偏导致渗漏、灌装过程刺伤造成渗漏、运输过程中揉搓造成渗漏、质量标准有待进一步提升等问题。中国餐饮油市场规模庞大,未来随着各省市禁止散装油政策的制订和执行力度进一步加强,BIB餐饮油包装市场将迎来可观的增长。     

新型PASSIM水松纸胶池式供胶系统的开发应用

PASSIM水松纸供胶发生间歇断流故障时会产生的大量的漏气和掉嘴烟支问题,为解决这一问题,通过增设胶池,改进上胶器、增设三级刮胶装置和增设胶位检测器等,实现了连续、稳定和清洁供胶,杜绝了漏气和掉嘴烟支产生,为产品质量提供了可靠保障。