滑坡地质灾害应用能量损伤锚固模型的治理应用研究

近几年来,滑坡地质灾害在我国多地频繁发生,使人们生命受到威胁、财产遭受损失,给国民经济造成负面影响。所以,滑坡地质灾害治理研究成为了众多地质专家学者研究的重点。本文首先对能量损伤锚固模型进行分析,而后对滑坡地质灾害治理中应用能量损伤锚固模型展开了研究。     

基于PCA和SVM算法的滑坡稳定性分析研究

滑坡稳定性的计算方法是滑坡研究的关键问题。本文选取了24个影响滑坡稳定性的因子,运用主成分分析对这些影响因子进行属性约简,去掉冗余的影响因素小的因子,得到12个核心的影响因子,并以此作为支持向量机的输入特征值,构建主成分分析与支持向量机结合的滑坡稳定性分析模型。通过对212组滑坡数据进行分析与验证,结果表明应用主成分分析-支持向量机模型不仅可以大幅度降低数据之间的相互影响,同时提高了稳定性分析准确性。     

滑坡失稳的断裂机制研究

本文在总结前人研究成果的基础上,着重研究了滑坡失稳的断裂机制。针对滑坡滑动面不同部位提出了两类基本断裂模型,参考应力强度因子手册,并采用模型等效的处理方式求解了两类复杂断裂分析模型中裂纹应力强度因子,以此作为判断滑坡失稳的标准。相关研究内容虽实践性有待加强,但在理论上却不失其新颖性,有一定发展空间。     

估值融合理论在滑坡动态变形监测中的应用研究

在滑坡动态变形监测中一般会在滑坡体上布置多个传感器,以进行综合观测。目前的监测模型仅依靠某个关键点的数据进行评判分析,容易造成原始数据信息的流失,且以往的研究多集中于监测数据的整合,并未考虑传感器自身的因素,引起融合结果的不精确。为了克服以上不足,引入多传感器估值融合理论,在证明了误差均方差最小意义下,多传感器数据融合的效果优于任一单个传感器进行估值的效果后,将其应用于西南某滑坡动态变形的监测分析。经分析知:该滑坡先后经历了缓慢变形期、匀速变形期、加速变形期和急剧变形期。表明该滑坡具有阶段性变化的特点,符合滑坡变形的一般自然规律。同时证明了该方法在滑坡动态变形监测与分析中具有有效性和可行性。     

预应力锚索抗滑桩在滑坡加固中的应用研究

为了研究抗滑桩在滑坡加固中的应用,本文以实际边坡模型为研究对象开展了相关研究,基于数值模拟软件分析了锚索抗滑桩加固边坡的作用效果,研究结果表明:在路堤修筑成形后滑坡断面的安全系数均不满足规范要求的最低值,进行加固后滑坡断面的安全系数值有明显的提高,并有一定的安全储备;抗滑桩内力以及锚索轴力分析结果来看,加固方案充分发挥了加固作用,方案合理可行,能够满足路堤的长期稳定。     

基于3S技术的数字滑坡地质灾害监测预警方法探讨研究

兰州是甘肃省的政治、经济、文化中心,但滑坡地质灾害较严重。本文根据3S技术在滑坡地质灾害监测中可起到的不同作用,结合滑坡地质灾害监测预警所需要的其他信息,将3S技术融入数据获取与提取、空间数据库管理、空间分析、动态监测等方面,构建出滑坡地质灾害监测预警系统,为兰州地区的滑坡地质灾害防治提供数字支持,是监测预警平台的重要组成部分,能更好地为防治工作服务。     

元坝某井场进场道路1号滑坡稳定性分析及防治措施

本文基于元坝某井场进场道路1号滑坡的现场调查及勘察工作,运用Geo-Studio软件中的SLOPE/W模块分析该滑坡在天然、暴雨两种工况下的稳定性,结果表明滑坡在天然工况下处于欠稳定~基本稳定状态,在暴雨工况下处于不稳定状态。基于滑坡的实际情况及稳定性分析结果,提出设置截排水沟与抗滑挡土墙的综合防治措施。     

试论土坝滑坡产生的原因及措施

本文首先分析了滑坡的相关概念和土坝滑坡的特点,并就滑坡的形成原因进行了分析,探讨了滑坡的预防方法,最后详细介绍了土坝滑坡的处理措施方法。     

基于表面倾角变化的滑坡临灾预警方法研究

监测预警是滑坡灾害预防的最有效手段之一。目前的滑坡灾害监测多采用以位移监测为主的方法成本高,专业性强,难以大面积推广使用。本文提出了基于滑体倾角变化的滑坡预警监测方法,通过滑体上倾角传感器变化规律与滑坡位移及速度等参数的对比研究发现,基于倾角变化的预警方法更加实用有效。     

基于3S技术的数字滑坡地质灾害监测预警方法探讨研究

兰州是甘肃省的政治、经济、文化中心,但滑坡地质灾害较严重。本文根据3S技术在滑坡地质灾害监测中可起到的不同作用,结合滑坡地质灾害监测预警所需要的其他信息,将3S技术融入数据获取与提取、空间数据库管理、空间分析、动态监测等方面,构建出滑坡地质灾害监测预警系统,为兰州地区的滑坡地质灾害防治提供数字支持,是监测预警平台的重要组成部分,能更好地为防治工作服务。     

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。     

中华人民共和国农业部公告 第267号

为贯彻落实《兽药生产质量管理规范》(简称《兽药GMP》),进一步推动兽药GMP实施进程,我部制定了《兽药生产质量管理规范检查验收办法》,现予公告。本公告自2003年6月1日起施行。附件:兽药生产质量管理规范检查验收办法二○○三年四月十日第一章 总则 第一条 为推动《兽药生产质量管理规范》(以下简称兽药GMP)的实施,规范兽药GMP检查验收工作,制定本办法。 第二条 农业部负责全国兽药GMP管理和检查验收工作;负责制修订兽药GMP检查验收管理规定;负责兽药GMP检查员队伍建设和监督管理工作,负责国际兽药贸易中GMP互认工作。 …     

鸡败血支原体垂直传播模式及其阻断方法

以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。     

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.