检索结果-南通市图书馆

Selective dissolution of eodiagenesis cements and its impact on the quality evolution of reservoirs in the Xing＇anling Group,Suderte Oil Field, Hailar Basin, China

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2016年第3期13卷 402-417页

作者： Zhen-Zhen Jia Cheng-Yan Lin Li-Hua Ren chun-mei dong School of Geosciences China University of Petroleum Qingdao 266580 Shandong China Key Laboratory of Reservoir Geology in Shandong Province Qingdao 266580 Shandong China

Reservoirs in the Xing＇anling Group in the Suderte Oil Field,Hailar Basin exhibit ultra-low to low permeability and high tuffaceous material *** study comprehensively analyzed diagenesis and quality evolution of these low-permeability reservoirs using thin sections,SEM samples,rock physical properties,pore water data,as well as geochemical numerical *** and analcite are the two main types of cements precipitated in the eodiagenetic stage at shallow burial depths in the *** two cements occupied significant primary intergranular pores and effectively retarded deep burial *** textures suggest selective dissolution of massive analcite and little dissolution of calcite in the mesodiagenetic *** calculations utilizing the Geochemist＇s Workbench 9.0indicated that the equilibrium constant of the calcite leaching reaction is significantly smaller than that of the analcite leaching reaction,resulting in extensive dissolution of analcite rather than calcite in the geochemical system with both minerals *** simulations with constraints of kinetics and pore water chemistry demonstrated that the pore water in the Xing＇anling group is saturated with respect to calcite,but undersaturated with analcite,leading to dissolution of large amounts of analcite and no dissolution of *** secondary intergranular pores have formed in analcite-cemented reservoirs from selective dissolution of analcite in the mesodiagenetic stage;the analcite dissolution formed preferential flow paths in the reservoirs,which promoted feldspar dissolution;and dissolution of such minerals led to the present reservoirs with medium porosity and low ***-cemented tight reservoirs have not experienced extensive dissolution of cements,so they exhibit ultra-low porosity and permeability.

关键词： Eodiagenetic cements Calcite Analcite Selective dissolution Secondary porosity Hailar Basin

Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： mei Zhang Wenhao Li Yangfei Chen Yang Jiang Xiaofei Guo Han dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation

基于支持向量回归的动态区域迁移建模方法及应用

在线全文

学校读者我要写书评

暂无评论

系统仿真学报 2009年第5期21卷 1224-1226页

作者：王玲穆志纯付冬梅北京科技大学信息工程学院北京100083

提出了一种基于支持向量回归的动态区域迁移建模方法,该方法使模型随着区域的动态迁移进行在线更新,并采用动态调整ε的方法对同一区域内的数据给予不同程度的考虑,使得当前时刻加入的新数据要比以前时刻的旧数据在建模中所占的比重大... 详细信息

提出了一种基于支持向量回归的动态区域迁移建模方法,该方法使模型随着区域的动态迁移进行在线更新,并采用动态调整ε的方法对同一区域内的数据给予不同程度的考虑,使得当前时刻加入的新数据要比以前时刻的旧数据在建模中所占的比重大。针对LF炉钢水温度预报问题,将此方法应用于预报建模。研究结果表明,该建模方法十分有效。

关键词：支持向量回归动态区域建模 LF炉

在线全文

学校读者我要写书评

暂无评论

碱催化多聚甲醛的解聚工艺条件研究

天然气化工—C1化学与化工 2017年第3期42卷 20-22页

作者：肖春妹陶川东刘旋李杰灵泉州师范学院福建泉州362011 西南化工研究设计院有限公司四川成都610225

考察了在碱催化下,温度、pH值等工艺条件对多聚甲醛解聚的影响,研究结果表明:在多聚甲醛解聚过程中,过高的温度和过强的碱性会加速副反应发生,最佳条件是在氮气保护下,T=80℃、pH值为8~9,反应1h,多聚甲醛解聚率接近完全,甲醛收率大于99%。

关键词：多聚甲醛碱催化解聚

槐杞黄辅助治疗哮喘儿童疗效及外周血中Th1 Th2相关细胞因子对氧磷酶1水平的影响

在线全文

学校读者我要写书评

暂无评论

中国实用儿科杂志 2018年第5期33卷 365-369页

作者：贾春梅王冬梅宁立华姜采荣楚文英曲艳杰王俊卿内蒙古自治区包头市第四医院儿科内蒙古包头014030

目的研究槐杞黄颗粒对哮喘患儿的辅助治疗作用,以及其对外周血中Th1、Th2相关细胞因子、对氧磷酶1(PON1)水平的影响。方法将2014年6月至2015年6月内蒙古自治区包头市第四医院收治的符合哮喘诊断标准的180例患儿随机分为研究组(96例)和... 详细信息

目的研究槐杞黄颗粒对哮喘患儿的辅助治疗作用,以及其对外周血中Th1、Th2相关细胞因子、对氧磷酶1(PON1)水平的影响。方法将2014年6月至2015年6月内蒙古自治区包头市第四医院收治的符合哮喘诊断标准的180例患儿随机分为研究组(96例)和常规组(84例),设定正常对照组(50例)。两组哮喘患儿均给予规范化哮喘基础治疗,研究组同时给予槐杞黄治疗3个月。比较两组哮喘患儿治疗前1个月、治疗后第1个月、第3个月及第6个月呼吸道感染次数、喘息发作次数、应用急救药物次数、因喘息住院次数,并比较治疗前及治疗后3个月的相关细胞因子水平变化。结果治疗后,上呼吸道感染次数、支气管炎和肺炎、喘息发作次数、应用急救药物次数和因喘息住院次数较治疗前均明显减少(P<0.05)。治疗前、后白介素-4(IL-4)、白介素-13(IL-13)、白介素-12(IL-12)、干扰素-γ(IFN-γ)和PON1水平变化差异均有统计学意义(P<0.01)。结论槐杞黄颗粒辅助治疗哮喘,能够减少呼吸道感染及喘息发作的次数,帮助提高临床治疗效果;可能通过降低外周血中Th2相关细胞因子(IL-4、IL-13)水平,提高Th1相关细胞因子(IL-12、IFN-γ)以及PON1水平,发挥治疗哮喘的作用。

关键词：槐杞黄颗粒支气管哮喘儿童对氧磷酶1

大口黑鲈转录组SNPs筛选及其与生长的关联分析

在线全文

学校读者我要写书评

暂无评论

水生生物学报 2016年第6期40卷 1128-1134页

作者：全迎春马冬梅白俊杰刘浩李胜杰刘海涌中国水产科学研究院珠江水产研究所农业部热带亚热带水产资源利用与养殖重点实验室广州510380

为开发人工饲料代替冰鲜杂鱼养殖大口黑鲈的分子标记,以食用冰鲜鱼和配合饲料的同批大口黑鲈为研究材料,利用RNA-Seq(RNA sequencing)技术挖掘SNPs(Single nucleotide polymorphisms)标记,并以关联分析筛选可用于育种的候选标记。转录... 详细信息

为开发人工饲料代替冰鲜杂鱼养殖大口黑鲈的分子标记,以食用冰鲜鱼和配合饲料的同批大口黑鲈为研究材料,利用RNA-Seq(RNA sequencing)技术挖掘SNPs(Single nucleotide polymorphisms)标记,并以关联分析筛选可用于育种的候选标记。转录组进行测序共获得174 M数据,8681个SNPs位点。挑选其中具有表达差异的50个SNPs位点进行SNa Pshot分型,结果39个分型成功,其中有4个为假阳性,通过转录组技术开发出SNPs标记35个,成功率为70.0%。为进一步检验这些标记是否可用于评估驯食饲料的大口黑鲈选育研究,研究以327尾摄食人工配合饲料的大口黑鲈为试验材料,SPSS软件进行一般线性模型分析SNPs的不同基因型与生长性状的相关性,结果显示有2个SNPs位点与体质量、全长和体高等生长性状存在显著相关性(P<0.05),可作为候选标记用于大口黑鲈的分子辅助育种。由于转录组数据直接反应基因的表达情况,从中挖掘与性状相关的优势基因型与分子标记的成功率高,效果较好。同时也为解决大口黑鲈选育研究中标记缺乏提供了有效途径,为选育提供遗传依据、加速育种进程。

关键词：转录组测序(RNA-Seq) 大口黑鲈单核苷酸多态(SNPs) 生长性状

Effects of Time Delay on Stability of an Unstable State in a Bistable System with Correlated Noises

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第4期28卷 40-42页

作者： LI chun mei dong-Cheng Department of Computer Science Simao Teachers’CollegePuer 665000 Department of Physics Yunnan UniversityKunming 650091

Effects of time delay on stability of an unstable state in a time-delayed bistable system are *** analytic expression of the transition rate W(x_(u),τ)from unstable state xu to stable state x+is *** numerical calculation results of W(x_(u),τ)indicate that W(x_(u),τ)decreases with the increasing multiplicative noise intensity,the additive noise intensi by and the strength of correlations between the multiplicative and the additive noise increase,but W(x_(u),τ)increases with increasing delay ***,the multiplicative noise,the additive noise and the correlations between the multiplicative and the additive noises enhance the stability of the unstable state in the time-delayed bistable system but the stability is weakened by time delay.

关键词： unstable noise Effects

旱田改水田对黑土pH、电导率及几种微生物的影响

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

湖北农业科学 2017年第3期56卷 459-461,470页

作者：顿圆圆杜春梅董锡文王妍佳木斯大学生命科学学院黑龙江佳木斯154007

为了了解长期旱田改水田对黑土理化性质和部分功能微生物的影响,选取旱田改水田5、10、30年的黑土为研究对象,对土壤pH、电导率及磷细菌、纤维素分解菌进行研究。结果表明,随着旱田改水田年限的增加,土壤的pH逐渐降低,其中,旱田改水田5... 详细信息

为了了解长期旱田改水田对黑土理化性质和部分功能微生物的影响,选取旱田改水田5、10、30年的黑土为研究对象,对土壤pH、电导率及磷细菌、纤维素分解菌进行研究。结果表明,随着旱田改水田年限的增加,土壤的pH逐渐降低,其中,旱田改水田5年时pH下降显著(P<0.05);土壤电导率先显著升高(P<0.05)后降低,其中,旱田改水田年限为5年时,电导率最高;有机磷细菌、无机磷细菌、纤维素分解菌都呈先减少后增加的趋势,其中,有机磷细菌在旱田改水田10年时平均数量最少,无机磷细菌、纤维素分解菌在5年时平均数量最少。

关键词：黑土旱田改水田 pH 电导率微生物

Analysis of the anti-T2DM components in dichloromethane fraction of Schisandra sphenanthera and its mechanism

在线全文

学校读者我要写书评

暂无评论

Traditional Medicine Research 2025年第1期10卷 27-43页

作者： Shi-Bo Feng Hai-Hui Jiang Hui-Li Kang Yi Jiang Hua-Wei Zhang Xiao-mei Song Yu-Ze Li Wen-Li Huang dong-dong Zhang Chong Deng School of Pharmacy Shaanxi University of Chinese MedicineXianyang 712046China School of Pharmacy and Shaanxi Qinling Application Development and Engineering Center of Chinese Herbal Medicine Shaanxi University of Chinese MedicineXianyang 712046China Key Laboratory for Research and Development of“Qin Medicine”of Shaanxi Administration of Traditional Chinese Medicine Xianyang 712046China Shaanxi Key Laboratory of Research and Application of“Taibai Qi Yao” Xianyang 712046China

Background:The type 2 diabetes mellitus(T2DM)pharmacodynamic study of various parts of Schisandra sphenanthera was conducted in the previous stage,and it was found that dichloromethane extracted part(SDP)had a significant hypoglycemic ***,the components of SDP were analyzed,and the specific mechanism of its anti-T2DM was ***:We used a high-fat,high-sugar diet in combination with streptozotocin to induce a T2DM rat model,and the model rats were divided into two groups according to body weight and blood ***,oral glucose tolerance test,fasting blood glucose,low density lipoprotein cholesterol,superoxide dismutase,insulin,glycated hemoglobin,total cholesterol,nonesterified free fatty acids,alanine aminotransferase,high-density lipoprotein cholesterol,aspartate aminotransferase,malondialdehyde,and glutathione peroxidase were measured,organ indices were calculated,and pathological sections of pancreas and liver were *** 16S rRNA V3–V4 region of intestinal flora was sequenced to explore the effect of SDP on biochemical indicators and intestinal *** on the above indicators,the anti-T2DM mechanism of SDP in Schisandra sphenanthera was ***:After six weeks of administration,the biochemical indices of diabetic rats were diminished compared to the control *** SDP could significantly increase the gut microbialα-diversity index,resulting in significant changes in the flora of T2DM rats,with increased richness and diversity,reduced harmful flora,and significantly back-regulated the levels of acetic acid,propionic acid,and butyric ***:SDP can improve the symptoms associated with elevated blood glucose,dyslipidemia,elevated fasting insulin levels,and damaged glucose tolerance in *** against T2DM may be through the control of intestinal flora to normalize and exert anti-diabetic effect;its main active components may be lignans and terpenoids.

关键词： Schisandra sphenanthera T2DM intestinal flora HPLC