钢弹簧浮置板道床施工技术及质量控制研究

钢弹簧浮置板道床,做为城市轨道交通工程的特殊减振措施,减振效果比其他中等及高等减振措施明显。同时,也存在钢弹簧浮置板道床施工周期长、工序复杂、质量控制要求高等问题。如果施工组织措施不力,质量控制不严,会造成特殊减振效果降低及后期维修周期缩短。因此,通过研究相关技术,严格施工工艺和技术标准,加强过程质量控制,解决钢弹簧浮置板道床施工质量下降和施工周期长的问题。     

高压旋喷桩施工工艺及质量控制探讨

高压旋喷桩的施工质量与施工技术参数的选择有关，通过新建津保铁路JBSG-1标段高压旋喷桩施工实例，对旋喷桩的施工工艺及质量控制标准进行了探讨。以及合理选择质量控制指标的方法，可对相关工程的施工工艺提供参考。     

试析桩基在建筑工程中的选择及应用

新形势下科学技术的快速发展极大的带动了桩基技术的发展,使其在种类和形式,施工工艺和施工设备都呈多样化的发展模式,而且在桩基的施工理论以及施工设计方法上都取得了极大的进步。当前桩基技术已经成为诸多土质不佳施工区域的工程项目及一些难度比较大的构造物中广泛采用的一种桩基基础形式。本文主要根据建筑施工过程中桩基的选择和应用,分析了桩基施工时的一些施工工艺与技术。     

强造斜地层大口径钻孔灌注桩成孔工艺方法研究

长沙三汉矶湘江大桥1#墩和3#墩基础为φ3500mm陆上钻孔灌注桩,桩长分别为41.8m,43.5m.桩尖持力层为微风化板岩,岩层节理面倾角以45～700为主,少数近直立,属强造斜地层.本文针对大口径钻孔灌注桩成孔施工工艺,通过成功的实例介绍,探索大口径桩在不同地层对钻孔机械、工艺方法的要求,从而提高对复杂地层的施工能力.     

浅谈钻孔灌注桩施工工艺

本文阐述了钻孔灌注桩的施工工艺,以及在施工过程中注意的一些事项。     

浅谈施工工艺对预算编制的影响

施工工艺是工程施工中所关联的材料和技术以及工序,在整个施工过程中必定会涉及到资金流动,这样工程造价预算就是不可避免的一部分.预算编制是各企业或工程建设单位对年度计划的资金分配和预算活动,所以工程建设中施工过程中施工工艺必定会对预算编制有影响.本文将重点讨论施工工艺对预算编制的影响和有效控制对预算编制的影响.     

10kV电力工程施工问题探究

提高10kV电力工程施工质量,加强施工人员培训,保证其对工程特点、工程规模以及工程建设有着全面了解,明确施工任务、操作方式以及施工工艺流程。制定有效措施,保证施工质量符合规定的要求,实现工程管理目标。本文将对10kV电力工程施工问题进行分析。     

试论沉桩工艺和技术在建筑施工中的应用

沉桩工艺是预制桩施工的一项重要施工技术,其主要是以锤击、振动以及静压等方式将预制桩沉入到技术设计要求的深度.由于沉桩所需的桩体为预制桩,可以大规模的批量生产,因而相较于灌注桩来讲,施工更为简便,工期较短,工程成本也相对较低,因而是一种应用较为广泛的桩基施工工艺.本文主要是以锤击法的沉桩施工工艺为例,通过对其施工的准备工作、施工技术应用、施工质量控制以及施工记录等几方面来详细探讨了沉桩工艺在建筑施工中的具体应用.     

浅析高层框剪结构土建施工中的免抹灰施工技术

随着城市经济不断发展,建筑工程项目数量越来越多,对建筑施工技术提出了更高要求,以满足社会发展需求,推动我国社会主义现代化建设。在高层框剪结构土建施工中,免抹灰施工技术是常见的施工措施,与房屋建筑施工过程中的安全性有着密切联系。本文就免抹灰施工技术中的钢筋工程的施工工艺、工程测量放线施工工艺、模板工程的施工工艺等进行分析和探讨,以促进高层框剪结构施工效率不断提高。     

公路桥梁上部构造的施工工艺分析

公路桥梁作为我国交通事业的重要组成部分,对国民经济起着举足轻重的作用。公路桥梁的构建是公路施工的重中之重,为了保证公路桥梁的施工质量,工作人员要对公路桥梁上部构造的施工工艺进行深入的分析研究,要深入探讨公路桥梁上部支架、施工模板、拱架、混凝土浇筑等方面的施工工艺,要加强与同行业工作人员的业务交流,全面提高公路桥梁上部构造的施工工艺,保障整体施工质量。     

商会自治的基石——商会自治规范研究

在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。     

癸氧喹酯干混悬剂含量测定的改进

采用高效液相色谱法测定癸氧喹酯干混悬剂的含量,在2-250μg/mL范围内,峰面积的常用对数与进样量浓度的常用对数呈良好的线性关系,R^2=1(n=5),平均回收率为99.24%~99.51%,RSD在0.05%~0.28%。此方法分析时间短,样品前处理简便、定量结果准确,重现性好,结果满意,为其质量控制提供了依据。     

猪毛色遗传的研究进展

本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。     

Comparison of 2 methods of centesis of the bursa of the biceps brachii tendon of horses

REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air.     

不同样本商品蜂蜜中硒含量的测定

用硝酸和高氯酸消化蜂蜜,使硒游离出来,在微酸性环境下,硒和2,3-二氨基萘(DAN)生成有较强荧光的物质,用环己烷萃取,在激发波长378nm,荧光波长518nm处测定其荧光强度。蜂蜜中硒含量范围:0.10～0.82μg/g。表明:蜂蜜应视为天然富硒营养品。     

乳酸杆菌益生作用机制的研究进展

乳酸杆菌作为益生菌广泛用于人和动物。本文综述了乳酸杆菌改善宿主健康的机制。乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道。文章重点讨论了乳酸杆菌表面成分（表面蛋白、脂磷壁酸和肽聚糖）与肠道受体（Ｃ型凝集素受体、Ｔｏｌｌ样受体和 Ｎｏｄ样受体）,阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制。     

Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF

Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo.     

Mechanism of Action of Probiotic Function of Lactobacilli

乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制.     

Evaluation of serum concentrations of biomarkers of skeletal metabolism and results of radiography as indicators of severity of osteochondrosis in foals

OBJECTIVE: To determine whether serum concentrations of biomarkers of skeletal metabolism can, in conjunction with radiographic evaluation, indicate severity of osteochondrosis in developing horses. ANIMALS: 43 Dutch Warmblood foals with varying severity of osteochondrosis. PROCEDURE: 24 foals were monitored for 5 months and 19 foals were monitored for 11 months. Monthly radiographs of femoropatellar-femorotibial and tibio-tarsal joints were graded for osteochondral abnormalities. Serial blood samples were assayed for 8 cartilage and bone biomarkers. At the end of the monitoring period, foals were examined for macroscopic osteochondrosis lesions. RESULTS: Temporal relationships were evident between certain serum biomarkers and osteochondrosis severity in foals during their first year. Biomarkers of collagen degradation (collagenase-generated neoepitopes of type-II collagen fragments, type-I and -II collagen fragments [COL2-3/4C(short)], and cross-linked telopeptide fragments of type-I collagen) and bone mineralization (osteocalcin) were positive indicators of osteochondrosis severity at 5 months of age. In foals with lesions at 11 months of age, osteochondrosis severity correlated negatively with COL2-3/4C(short) and osteocalcin and positively with C-propeptide of type-II procollagen (CPII), a collagen synthesis marker. Radiographic grading of osteochondrosis lesions significantly correlated with macroscopic osteochondrosis severity score at both ages and was strongest when combined with osteocalcin at 5 months and CPII at 11 months. CONCLUSIONS AND CLINICAL RELEVANCE: The ability of serum biomarkers to indicate osteochondrosis severity appears to depend on stage of disease and is strengthened with radiography. In older foals with more permanent lesions, osteochondrosis severity is significantly related to biomarker concentrations of decreased bone formation and increased cartilage synthesis.