慢性萎缩性胃炎中医证型与癌变风险的相关性研究          下载免费PDF全文

李强斌  安云  陈伟刚 《应用海洋学学报》2021,37(8):9

目的：研究慢性萎缩性胃炎（CAG）中医证型与癌变风险的相关性。方法：将2016—2020年在广州市番禺区中医院消化内科就诊的1020 例CAG患者进行回顾性研究,分析患者中医证候及分布规律,比较不同证型患者的肠上皮化生率、上皮瘤变率和Hp感染率。结果:脾胃湿热证、肝脾不和证的肠上皮化生率及上皮瘤变率均高于脾胃虚弱证、胃阴不足证、胃络瘀血证,差异均有统计学意义（P＜0.01）;脾胃湿热证、肝脾不和证、胃络瘀血证的Hp感染率高于脾胃虚弱证、胃阴不足证,差异均有统计学意义（P＜0.01）。logictic回归分析结果显示,肠上皮化生、上皮瘤变、Hp感染均为CAG癌变的单影响因素（P＜0.05）。结论：不同中医证型的CAG患者癌变风险存在差异,中医证型的运用对癌变风险的临床评估具有一定的参考意义。  相似文献   

任楼煤矿7_2煤顶板岩体特征研究     

张大伟  冯松宝  汪伟民  王慎 《中国煤炭地质》2010,(2):40-42

针对任楼煤矿开采72煤过程中,巷道在强大的动压作用下,破坏严重的情况,从岩性组成、岩层组合类型和顶板岩体结构三个方面,研究了煤层顶板岩体特征。研究结果表明,72煤顶板岩体岩性以软岩为主,岩层组合以"直接顶+老顶"的组合形式为主,岩体结构以碎裂和块裂结构为主。研究结果为巷道布置、支护形式选择、顶板管理提供了科学依据。  相似文献   

滑坡灾害与处治效果的地球物理勘察应用研究     

方大为  张可能 《中国煤炭地质》2010,(10):57-61

以刘少奇同志故居管理局园区的滑坡地质勘察及治理工程为例,介绍了高密度电阻率法、直流电测深法和地震地质映象法等的综合应用。工程采用温纳装置、斯龙倍格装置,设计了一组适合该区域地质特征的技术参数,通过对岩溶的发育形态、规模、深度进行探测分析,确定了该区岩溶范围与溶洞的分布状况以及滑移面的变化趋势。结合钻探资料对整个园区的地质灾害程度进行了综合评价,并提出了运用高压旋喷灌浆的治理方案。经验证,该园区的滑坡治理措施取到了较好的效果。  相似文献   

Geologic Features of Wangjiatun Deep Gas Reservoirs of Volcanic Rock in Songliao Basin     

SHAN Xuanlong  CHEN Shumin  WU Dawei  Zang Yudong 《世界地质(英文版)》2001,4(2)

Wangjiatun gas pool is located at the north part of Xujiaweizi in Songliao basin. Commercial gas flow has been found in the intermediate and acid volcanic rock of upper Jurassic - lower Cretaceous, which makes a breakthrough in deep nature gas prospecting in Songliao basin. The deep natural gas entrapment regularity is discussed in the paper by the study of deep strata, structure and reservoir. Andesite, rhyolite and little pyroclastic rock are the main reservoirs. There are two types of volcanic reservoir space assemblage in this area: the pore and fissure and the pure fissure. Changes had taken place for volcanic reservoir space during long geologic time, which was controlled by tectonic movement and geologic environment.The developed degree of reservoir space was controlled by tectonic movement, weathering and filtering, corrosion and Filling. There are three types of source- reservoir-caprock assemblage in this area: lower source- upper reservoir model,upper source - lower reservoir model and lateral change model. Mudstone in Dengluoku formation and the compacted volcanic rock of upper Jurassic - lower Cretaceous are the caprock for deep gas reservoirs. Dark mudstone of deep lacustrine facies in Shahezi formation and lower part of Dengluoku formation are the source rock of deep gas. It can be concluded that deep gas pools are mainly volcanic lithologic reservoirs.  相似文献   

海区尺度港航地图集的内容设计——以《中国北方枢纽港港航地图集》为例     

庞小平  安妮  白亭颖  石金榜  杨龙  祁馨 《测绘地理信息》2021,46(1):28-33

《中国北方枢纽港港航地图集》是首部以中国北方海区枢纽港港口经济和航海保障为主题的区域性港航地图集。从制图区域、指标体系、内容框架等方面入手,探讨了海区尺度港航地图集的内容设计特点,展现了港产城一体、陆海统筹等区域港口经济的本质特征,为今后同类地图集的制作提供新的思路和参考。  相似文献   

天山山区1961-2010年面雨量分布及变化特征     

赵玲  杨青  安沙舟 《沙漠与绿洲气象(新疆气象)》2013,7(2)

利用1961-2010年天山山区44个气象站和10个水文站的观测资料,结合数字高程模型(DEM)1 km×1 km网格数据,采用了自然正交分解(EOF)、多元回归分析、最大熵谱值分析等方法,对天山山区面雨量进行了计算,建立了区域面雨量时间序列,研究其时空分布特征及变化规律.天山山区的面雨量基本上呈现北多南少,西多东少的特征,多年平均面雨量1098.7×108 m3,且在1987年发生突变.冬季降水在年际变化和年代际变化特征上都呈现出明显的增加趋势..  相似文献   

全国网格化多模式集成空气质量预报的初步建立     

张天航  迟茜元  张碧辉  张恒德  江琪  王继康  饶晓琴  谢超  吕梦瑶  安林昌  南洋 《气象》2020,46(3):381-392

为降低单个模式预报的不确定性和提高多模式集成空气质量预报系统的精细化程度,利用Cressman插值初步建立了我国0.25°X0.25°网格化污染物实况。结合4套空气质量数值预报模式,通过均值集成、权重集成和多元线性回归集成分别逐格点建立了集成预报。在预报当天各单一模式和集成方法前50 d预报效果评估基础上,建立了最优集成预报。对2018年12月19一22日一次重污染过程中集成预报的PM_(2.5)浓度评估结果显示:在污染较重时刻,最优集成预报与观测之间的归一化平均偏差(NMB)值在重污染地区保持在—20%～40%,对污染程度为良及以上区域的预报范围相较于单个模式更接近观测。整个过程中,最优集成在大部分污染区域与观测之间的NMB值为—20%～20%,均方根误差(RMSE)值为35～75μg·m~(-3),相关系数(R)值大于0.4。相较于所有单一模式和其他集成方法,最优集成在全国最多的格点有着较高的总体评分。在污染最重区域的8个城市,最优集成预报的污染过程平均开始和结束时间分别比观测时间早1.8和6.9 h。未来需融合卫星反演和地表观测来提高网格化污染物实况的精细化程度,利用降尺度、主客观融合和滚动订正等方法进一步提高网格化多模式集成空气质量预报的准确率。  相似文献   

Community Structure and Abiotic Determinants of Salt Marsh Plant Zonation Vary Across Topographic Gradients     

Bao-Shan CUI  Qiang HE  Yuan AN 《Estuaries and Coasts》2011,34(3):459-469

We investigated compositions of plant communities and their abiotic determinants in the Yellow River estuary, China. Along a topographic gradient, we quantified plant compositions and abiotic factors in different vegetation zones, and examined the relationships between plant communities and abiotic factors using canonical correspondence analysis and the effects of vegetation shading using a removal experiment. The relationships between plant communities and abiotic factors differed between high elevations and low elevations. Salinity and flooding oppositely related with distributions of plant communities at low elevations, but they appeared to operate synergically at high elevations. The effects of vegetation shading were found to vary across the topographic gradient, indicating spatial variations in potential positive interactions among plants. These results suggest that spatial variations in determinants of community structure should be addressed in future studies in estuarine and coastal systems, as well as in other natural habitats.  相似文献   

广西云开地区成矿系列及成矿谱系研究   总被引：1，自引：0，他引：1  

代晓莉  安国英 《四川地质学报》2011,31(2):187-191

广西云开地区是广西境内重要的铅锌金银多金属资源富集区之一。运用矿床成矿系列的理论和方法,对广西云开地区进行矿床成矿系列和成矿谱系研究,以典型矿床地质特征分析为基础,根据各矿种在区域内的演化归结为成矿谱系,初步厘定了3个矿床系列和2个亚系列。指出了该区燕山期成矿作用强烈,以与构造岩浆活动有关的金、银、铅锌矿床为主,以沉积岩容矿的层控热液型金、汞、锑、铅锌的大量发育为特征。广西云开地区成矿系列和成矿谱系的划分,对深入研究该地区区域成矿规律,指导矿产勘查工作具有重要意义。  相似文献   

Optimization of dilute acid hydrolysis of Enteromorpha     

���ΰ  ������  ���  ����  ���� 《中国海洋湖沼学报》2011,29(6):1243-1248

Acid hydrolysis is a simple and direct way to hydrolyze polysaccharides in biomass into fermentable sugars. To produce fermentable sugars effectively and economically for fuel ethanol, we have investigated the hydrolysis of Enteromorpha using acids that are typically used to hydrolyze biomass:H2SO4, HCl, H3PO4 and C4H4O4 (maleic acid). 5%(w/w) Enteromorpha biomass was treated for different times (30, 60, and 90 min) and with different acid concentrations (0.6, 1.0, 1.4, 1.8, and 2.2%, w/w) at 121°C. H2SO4 was the most effective acid in this experiment. We then analyzed the hydrolysis process in H2SO4 in detail using high performance liquid chromatography. At a sulfuric acid concentration of 1.8% and treatment time of 60 min, the yield of ethanol fermentable sugars (glucose and xylose) was high, (230.5 mg/g dry biomass, comprising 175.2 mg/g glucose and 55.3 mg/g xylose), with 48.6% of total reducing sugars being ethanol fermentable. Therefore, Enteromorpha could be a good candidate for production of fuel ethanol. In future work, the effects of temperature and biomass concentration on hydrolysis, and also the fermentation of the hydrolysates to ethanol fuel should be focused on.  相似文献