铁路站场岩溶地基加固补强技术与效果分析     

苏谦  黄俊杰  白皓  李星  田宁 《岩土力学》2013,34(3):776-782

针对某病害站场路基,根据其变形规律对其基础进行补勘,分析病害原因,在此基础上提出岩溶地基加固补强方案：①补注浆加固岩溶地基和基岩顶面土体;②高压旋喷加固补强原复合地基;③低压注浆加固垫层及其以上3～5 m路基填土层;④侧向补注浆帷幕加固地基;⑤建立路基变形监测系统,评估加固补强效果。加固补强后地基沉降量和复合地基承载力特征值的理论计算值分别为12.4 mm和455 kPa,满足设计要求。现场监测结果表明,补注浆加固岩溶地基及其顶面土体后,站场路基变形减缓;旋喷桩和低压注浆加固区竣工后,路基呈均匀性沉降变形,变形速率急剧变小;竣工6个月后,路基变形趋于稳定,综合验证了加固补强方案的正确性和有效性。  相似文献   

Some pathological abnormalities of New Zealand fishes     

B. K. Diggles 《新西兰海洋与淡水研究杂志》2013,47(4):705-713

A number of pathological abnormalities previously unrecorded in New Zealand fishes are described. A silver trevally (Pseudocaranx dentex) captured from the Bay of Islands exhibited swim bladder ectasia. Black oreo (Allocyttus niger) and smooth oreo (Pseudocyttus maculatus) had cysts of unknown aetiology (CUEs) in the gills at prevalences up to 76% and 81%, respectively, in some fishing areas. The CUEs appear long lived and may have some utility for stock discrimination. A hoki (Macruronus novaezelandiae) with X‐cell pseudotumours in the gill was recorded from the Chatham Rise. Alfonsino (Beryx splendens) had conspicuous Kudoa sp. cysts in the gills at prevalences of up to 28%. Smelt (Retropinna retropinna) from the Waikato River were infected with a xenoma forming, Glugea‐like microsporidian.  相似文献   

呼吸道和心脑血管疾病与气象条件关系的研究进展   总被引：4，自引：1，他引：3       下载免费PDF全文

岳海燕  申双和 《气象与环境学报》2009,25(2):57-61

全球气候的变化,城市热岛效应的持续和加强以及热浪冲击频率的增多,给人类的健康带来了很大的影响。 随着经济和技术的发展,人们生活水平的提高,疾病与气象条件之间的关系越来越受到关注。通过分析总结主要气象因素气温、气压、风速对呼吸道和心脑血管疾病发病和死亡情况影响的研究成果。对气象条件与疾病之间关系研究中存在的问题,提出了一些意见和建议。  相似文献   

气候变化与人体健康   总被引：2，自引：0，他引：2       下载免费PDF全文

周晓农 《气候变化研究进展》2010,6(4):235-240

综述了气候变化与人类健康的关系,着重分析了气候变化对人体健康影响的主要方面与途径、适应气候变化的主要措施,提出了气候变化与人体健康关系研究中的科学问题及优先研究领域。并从国家层面上探讨了如何加强能力建设与制度建设等保障措施。  相似文献   

Diseases leading to accelerated decline of reef corals in the largest South Atlantic reef complex (Abrolhos Bank, eastern Brazil)     

Francini-Filho RB  Moura RL  Thompson FL  Reis RM  Kaufman L  Kikuchi RK  Leão ZM 《Marine pollution bulletin》2008,56(5):1008-1014

Although reef corals worldwide have sustained epizootics in recent years, no coral diseases have been observed in the southwestern Atlantic Ocean until now. Here we present an overview of the main types of diseases and their incidence in the largest and richest coral reefs in the South Atlantic (Abrolhos Bank, eastern Brazil). Qualitative observations since the 1980s and regular monitoring since 2001 indicate that coral diseases intensified only recently (2005–2007). Based on estimates of disease prevalence and progression rate, as well as on the growth rate of a major reef-building coral species (the Brazilian-endemic Mussismilia braziliensis), we predict that eastern Brazilian reefs will suffer a massive coral cover decline in the next 50 years, and that M. braziliensis will be nearly extinct in less than a century if the current rate of mortality due to disease is not reversed.  相似文献   

基于数据挖掘分析《类证治裁》治疗脾胃病的用药规律          下载免费PDF全文

杨远航  蔡佳丽 《应用海洋学学报》2024,40(5):15

目的：基于数据挖掘分析林珮琴《类证治裁》治疗脾胃病的用药规律,为中医药治疗脾胃病及新方研发提供参考。方法：运用中医传承计算平台构建《类证治裁》治疗脾胃病的方剂数据库,并对其进行用药频次、性味、归经、功效、高频组合与核心组合的分析。结果：共纳入方剂123首,涉及药物142味。用药频次≥20次的共8味,其中甘草应用频次最多。四气以温、寒、平为主,五味以甘、苦、辛为主,归经以脾、肺、胃为主。药物功效以补虚类为主。通过关联规则分析得到药物高频组合16组,通过聚类分析得到药物核心组合3组。结论：林珮琴治疗脾胃病始终秉持“以补益脾胃为本”的理念,补行并重,补清兼顾,为现代中医学诊治脾胃病提供了一定的理论依据。  相似文献   

不同人口流动模式下城市传染病时空传播模型适用性研究     

薛山  廖一兰  李春林  胡艺 《地球信息科学学报》2023,25(1):208-222

空间显式传染病传播模型由于能够较好地模拟城市内部的传染病传播过程,在城市疫情防控中得到了广泛应用。但现有的空间显式模型大多按照人口随机流动模式来模拟城市人口流动行为,未考虑城市中以通勤为主的人口流动模式。本文以长沙市的2014年第1～49周手足口病传播过程为例,将4、8、24邻域扩散以及重力模型、辐射模型共5种不同的人口流动模式与周期SEIR动力学模型结合建立起五种传染病传播模型,并通过比较模型时间和空间精度来明确不同人口流动模式应用在城市内传染病时空传播模拟中的各自优势和适用范围。实验结果表明：每种人口流动模式在城市内传染病时空传播模拟中都有其使用前提和适用范围。基于24邻域扩散的传播模型对手足口病病例数拟合精度最高(RMSE_spatial＿ts=0.58,RMSE_spatial＿st=0.95),基于重力模型的传播模型对城市内部传染病时空传播模拟中的传播趋势的模拟精度最高(r_spatial＿ts=0.46,r_spatial＿st=0.39),且对长沙市人口相对稠密区域(格网常住人口数大于第三四分...  相似文献   

Effects of rising temperature on growth and energy budget of juvenile Eogammarus possjeticus(Amphipoda:Anisogammaridae)     

Suyan Xue  Yuze Mao  Jiaqi Li  Jianguang Fang  Fazhen Zhao 《海洋学报(英文版)》2021,40(9):82-89

Growth and energy budget of marine amphipod juvenile Eogammarus possjeticus at different temperatures(20°C,24°C, 26°C, 28°C, 30°C, 32°C and 34°C) were investigated in this study. The results showed that the cumulative mortality rate increased significantly with rising temperature(p0.01), and exceeded 50% after 24 h when temperature was above 30°C. With the temperature increasing from 20°C to 26°C, the ingestion rate and absorption rate increased, but decreased significantly above 28°C(p0.01), indicating a decline in feeding ability at high temperatures. The specific growth rate increased with rising temperature, but decreased significantly(p0.01) after reaching the maximum value at 24°C. Similarly, the oxygen consumption and ammonia emission rates also showed a trend of first increase and then decrease. However, the O:N ratio decreased first and then increased with rising temperature, indicating that the energy demand of E. possjeticus juvenile transferred from metabolism of carbohydrate and lipid to protein. In the energy distribution of amphipods, the proportion of each energy is different. With rising temperature, the ratio of the energy deposited for growth accounted for ingested gross energy showing a trend of decrease, while the energy lost to respiration, ammonia excretion, and feces accounted for ingested gross energy being showed a trend of increase. It seemed that rising temperature increased the metabolism and energy consumption of the amphipods and, meanwhile, decreased the energy used for growth, which may be an important reason for the slow growth and small body size of the amphipods during the summer high-temperature period.  相似文献   

Mycosynthesized Silver Nanoparticles as Potent Growth Inhibitory Agents Against Selected Waterborne Human Pathogens     

《洁净——土壤、空气、水》2017,45(4)

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咳喘宁对哮喘豚鼠IL-6、TNF-α的调节作用研究          下载免费PDF全文

杨婷  屈波  董晓斐 《应用海洋学学报》2020,36(7):144

目的：研究咳喘宁对哮喘豚鼠白细胞介素（IL-6）和肿瘤坏死因子（TNF-α）的调节作用。方法：将60只豚鼠随机分为空白组10只、造模组50只。利用呼吸道合胞病毒（RSV）感染豚鼠建立动物模型,加鸡卵白蛋白（OVA）诱导建立哮喘模型。造模组成功后再将其随机分为模型组,咳喘宁高、中、低剂量组,西药组,每组各10只。咳喘宁高、中、低剂量组分别给予不同剂量的咳喘宁口服液,西药组给予地塞米松+利巴韦林,空白组、模型组给予0.9%氯化钠注射液。经治疗7 d后,应用HE染色法检测咳喘宁对RSV哮喘豚鼠模型的治疗效果;收集支气管肺泡灌洗液（BALF）并采集心脏血,用酶联免疫吸附（ELISA）法分析血清、BALF中IL-6和TNF-α的含量。结果：血清、BALF中IL-6、TNF-α含量,模型组与空白组比较,差异有统计学意义（P＜0.05）,说明造模成功。咳喘宁高、中、低剂量组及西药组与模型组比较,差异均有统计学意义（P＜0.05）。咳喘宁高剂量组与西药组比较,差异亦有统计学意义（P<0.05）。结论：咳喘宁可以降低炎性因子水平,控制气道炎症,调节IL-6和TNF-α含量,改善哮喘模型豚鼠的肺组织病理变化。  相似文献