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Search Results: 1 - 10 of 259356 matches for " 张阳 "
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宜宾县山洪灾害调查实践
The Mountain Flood Disaster Investigation Practice in the Yibin Country
 [PDF]

, 彭凌
Journal of Water Resources Research (JWRR) , 2015,
Abstract:
山洪灾害具有突发性强、预测预报预警难度大、破坏性强、成灾快、防御难等特点,历来是防汛抗灾工作中的一道难题。根据统一要求与安排,组织有关单位对本县山洪灾害情况进行全面调查,取得了系列调查成果。这些成果将成为进一步加强山洪灾害防治建设的基础数据和技术支撑。建议做好行政区域基础统计,有利于“防、放、走、进”,有的放矢地实施山洪灾害防治工作。
The mountain flood disaster has always been a difficult problem in the practice of flood prevention and fighting against natural disasters, which has the characteristics of bursting strongly, forecasting and warning difficulty, strong destruction, fast disaster forming, hard defense etc. According to the unified requirements and arrangements of the state, a comprehensive investigation of the mountain flood dis-aster was carried out, which achieved a series of investigation results. These results will provide a basic data and technical support for strengthening the construction of mountain flood disaster prevention. Doing more regional statistics work is suggested in order to control mountain flood disaster much better in the Yibin country.
一类分数阶导数微分方程的隐式差分解法
An Implicit Finite Difference Scheme for Space-Time Fractional Partial Differential Equation
 [PDF]

, 王瑞怡
Operations Research and Fuzziology (ORF) , 2013, DOI: 10.12677/ORF.2013.32002
Abstract:
分数阶导数微分方程作为通常微分方程的推广,被广泛地应用于工程,物理,信息处理,金融,水文等领域。本文给出了数值求解一类时间空间分数阶导数的双边空间微分方程的一种隐式差分格式,并对其稳定性和收敛性进行了理论分析,证明了格式的无条件稳定性并给出了收敛阶估计。
Fractional order differential equations are generalizations of classical differential equations. They are widely used in the fields of diffusive transport, finance, nonlinear dynamics, signal processing and others. In this paper, an implicit finite difference method for a class of initial-boundary value space-time fractional two-sided space partial differential equations with variable coefficients on a finite domain is established. The stability and convergence order are analyzed for the resulted implicit scheme. With mathematical induction skills, the scheme is proved to be unconditionally stable and convergent.
THE MIXED FINITE ELEMENT METHOD FOR A CLASS OF NONLINEAR PARABOLIC EQUATIONS AND ITS ERROR ANALYSIS
一类非线性抛物型方程的混合元方法及其误差估计


计算数学 , 1991,
Abstract: The mixed finite element method and its solvability for aclass of nonlinear pa-rabolic equations are discussed. An optimal order L~2 error estimate for the methodis derived.
出版美术作品应注意的版权问题

科技与出版 , 2011,
Abstract: 出版美术作品应当注意相应的版权问题,使用作品应当经过权利人的许可,注意美术作品的版权保护期制度等问题。
一类非线性抛物型方程的混合元方法及其误差估计

计算数学 , 1991,
Abstract: 当前,混合元方法求解微分方程已广泛应用于椭圆边值问题,其理论分析也相当完善.在[1]—[2],[4]中,对线性椭圆问题的混合元方法进行了讨论,[5]对拟线性椭圆问题进行了理论分析.相对而言,关于发展型方程的混合元方法,特别是对非线性问题,其理论分析仍不够完善,缺乏统一的论述.本文对下列非线性抛物问题:
基于GIS的井下机车区域定位检测系统

金属矿山 , 2012,
Abstract: 介绍了一种基于GIS的井下机车区域定位检测系统,该系统可有效地改善目前井下机车的使用情况。系统主要包括机车检测器、检测分站和主站计算机3部分。机车检测器测量机车车速,超速报警并将机车的车速、车号和车皮等信息通过无线传输技术发送到检测分站;检测分站通过井下环网将接收到的数据上传到主站计算机;主站计算机根据检测分站上传来的数据,利用GIS软件MapX,以VB为开发平台,实时模拟井下机车运行状况。
果脯膨化方法的研究

食品科学 , 1995,
Abstract: ?果脯膨化方法的研究张阳新疆农科院农业机械化研究所830000膨化果脯是一种新奇而独特的食品,在国内外很少见到,与传统方法制作的果脯相比,在外观,质地,以及味感,齿感和风味等方面都有明显的不同.果脯的体积可以膨大0.5-,1.5倍。一般果脯中都含有糖,...
婴幼儿食品中金黄色葡萄球菌污染情况及其耐药基因和新型肠毒素基因的检测

- , 2016, DOI: 10.13982/j.mfst.1673-9078.2016.11.042
Abstract: 本文调查了婴幼儿奶粉和米粉中金黄色葡萄球菌的污染状况,并且检测其耐药基因和新型肠毒素基因。采集陕西省2010年和2012年间不同品牌的婴幼儿奶粉和米粉692份,进行金黄色葡萄球菌污染检验,采用PCR对分离菌株进行31种耐药基因和9种新型肠毒素基因的检测。692份样品中金黄色葡萄球菌的检出率为7.80%,其中2010年所采样品的检出率为8.17%,2012年所采样品的检出率为7.38%。分离的75株菌最终检测出12种耐药基因和2种新型肠毒素基因,检出率最高的耐药基因是tetK (72.00%),其次是blaZ (36.00%),ermC (29.33%),tet(K)F (21.33%),linA/linA’ (12.00%),dfrG (8.00%),tetL (6.67%)和acc(6') (5.33%),最少的为ermB,msrA、msrB和drfK (均为1.33%)。新型肠毒素基因仅检测出sen(44.00%)和ser(4.00%)。不同采样年份、生产季节和货架期的样品中金黄色葡萄球菌的污染率不存在显著差异。并且这些菌株主要携带四环素、青霉素和大环内酯类抗生素的耐药基因,以及新型毒素基因sen。
The prevalence of S. aureus contamination in infant formula milk powder (PIF) and infant rice cereal (IRC) was investigated in this study, and the corresponding antibiotic resistance genes and novel enterotoxin genes were detected. A total of 692 PIF and IRC samples of different brands were collected in the Shaanxi province of China in 2010 and 2012 and screened for S. aureus. Polymerase chain reaction (PCR) was employed to detect 31 antibiotic resistance genes and nine novel enterotoxin genes among the isolates. The overall positive rate for S. aureus in 692 samples was 7.80%, including 8.17% among the samples collected in 2010 and 7.38% among the samples collected in 2012. Among the 75 isolated strains of S. aureus, 12 types of antibiotic resistance genes and two novel enterotoxin gene profiles were detected. The resistance gene with the highest detection rate was tetK (72.00%), followed by blaZ (36.00%), ermC (29.33%), tet(K)F (21.33%), linA/linA (12.00%), dfrG (8.00%), tetL (6.67%), and acc(6') (5.33%), and the genes with the lowest detection rate were ermB, msrA, msrB, and drfK (all at 1.33%). Among the novel enterotoxin genes, only sen (44.00%) and ser (4.00%) were detected. No significant difference was found in the contamination rate of S. aureus among the samples from different sampling years and production months and with different shelf lives. Additionally, the primary antibiotic resistance genes that these strains carried conferred resistance to penicillin, tetracycline, and macrolide, and the main virulence gene was sen.
猪源金黄色葡萄球菌vwb基因分布及对不同动物体外凝血致病作用的研究

- , 2018, DOI: 10.13982/j.mfst.1673-9078.2018.9.014
Abstract: 为调查猪源金黄色葡萄球菌(Staphylococcus aurues,S. aureus)对不同动物宿主具有凝血致病作用及是否携带S. aureus凝固酶基因vwbC、vwbSbo4、vwbSov2和vwbSeq1,本文以厦门地区生猪养殖场、屠宰场和终端市场分离的130株S. aureus为研究对象,通过血浆凝固酶实验研究菌株对兔血浆、牛血浆和羊血浆的凝血致病性,采用PCR方法对实验菌株进行vwbC、vwbSbo4、vwbSov2和vwbSeq1基因的扩增。结果表明,兔血浆、牛血浆和羊血浆的阳性凝血率分别为100.00%、28.46%、28.46%。S. aureus凝固酶vwbC,vwbSbo4和vwbSov2基因的检出率分别为100.00%(130/130),26.92%(35/130)和26.93%(38/130),vwbSeq1基因未检出;来自生猪养殖场S. aureus中vwbSbo4和vwbSov2基因的检出率以及对牛血浆和羊血浆的阳性凝血率明显高于另外两种来源S. aureus,有显著性差异(p<0.05)。研究结果说明猪源S. aureus对不同动物宿主具有凝血致病作用,为猪源S. aureus对不同动物宿主的凝血致病作用和适应性提供研究基础。
In this work, to investigate the coagulation pathogenicity of porcine Staphylococcus aureus to different animal hosts and whether they harbor staphylococcal coagulase genes of vwbC, vwbSbo4, vwbSov2 and vwbSeq1, 130 S. aureus were isolated from swine farm, slaughterhouse and terminal market in Xiamen. Coagulation adaptability of these isolates to rabbit, bovine and goat plasma were studied by coagulase assays. The distribution of vwbC, vwbSbo4, vwbSov2 and vwbSeq1 genes in 130 S. aureus were also investigated by PCR amplification. The results showed that positive coagulation rate of 130 S. aureus to rabbit, bovine and goat plasma were 100.00%, 28.46% and 28.46%, respectively. The staphylococcal coagulasegenes of vwbC, vwbSbo4 and vwbSov2 were identified in 100.00% (130/130), 26.92% (35/130) and 26.93% (38/130) of all isolates, respectively. None of isolates harbored vwbSeq1gene.The detection rates ofvwbSbo4 and vwbSov2 genes and the positive coagulation rates of bovine and goat plasma of S. aureus isolated from pig farms were significantly higher than those isolated from slaughterhouse and terminal marker isolates (p<0.05). This work showed that porcine S. aureus possessed coagulation pathogenicity to different animal hosts and provided a basis for studying on the coagulation pathogenicity and host adaptability of porcine S. aureus.
分数阶导数双边空间微分方程的显式差分解法
Finite Difference Methods for Space-Time Fractional Two-Sided Space Partial Differential Equations
 [PDF]

, 李宁平, 陈璐
Operations Research and Fuzziology (ORF) , 2012, DOI: 10.12677/orf.2012.21001
Abstract:
分数阶微分方程作为广义的微分方程,被广泛地应用于物理,信息处理,金融等领域。本文给出了数值求解时间空间分数阶导数的双边空间微分方程的一种显式差分格式,并对其稳定性和收敛性进行了理论分析。
Fractional order differential equations are generalizations of classical differential equations. Now, they are widely used in the fields of physics, information; finance and others. In this paper, an explicit finite difference method for space-time fractional two-sided space partial differential equations is established. Be- sides, the stability and convergence order are analyzed.
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