检索结果-南通市图书馆

The Method of Combined Inspection

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2009年第2期25卷 235-242页

作者： Wei-qing zhang xiao-long Pu yan Li School of Finance and Statistics East China Normal University Shanghai 200241 China

For costly and/or destructive inspections for a complex population, the sum of observations, the test statistic in common use, is shown to be inefficient in risk control. For the complex population consisting of Bernoulli distributions, the method of combined inspection is proposed in this paper, Evaluation based on examples and simulation results is conducted according to the method of limited classification. It is concluded that the new method is efficient and applicable.

关键词： Method of combined inspection sampling inspection complex population overall classification limited classification

Hypersingular parameterized Marcinkiewicz integrals with variable kernels on Sobolev and Hardy-Sobolev spaces

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2008年第4期23卷 420-430页

作者： CHEN Jie-cheng YU xiao zhang yan-dan WANG Hui Department of Mathematics Zhejiang University Hangzhou 310027 China

Let α≥ 0 and 0 〈 ρ ≤ n/2, the boundedness of hypersingular parameterized Marcinkiewicz integrals μΩ,α^ρ with variable kernels on Sobolev spaces Lα^ρ and HardySobolev spaces Hα^ρ is established.

关键词： parameterized Marcinkiewicz integral variable kernel Hardy-Sobolev space L^α-Dini condition

Structure and Texture Formation During Single and Double Cold Rolling and Annealing Processes for Nb+Ti Added Interstitial-Free Steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第5期20卷 42-49页

作者： FENG yan-qing WANG Fu-ming TAO Su-fen ZHAO Dian-qing zhang xiao-yan State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Baotou Iron and Steel (Group) Co. Ltd.

The structure and texture formation for single cold rolling （SCR） with annealing and double cold rolling （DCR） with annealing were investigated based on optical microscope and X-ray diffraction （XRD） with a Nb＋Ti bearing interstitial free （IF） steel. The results indicated that DCR recrystallization grain was smaller than that of SCR sample and double cold rolling process resulted in better mechanical properties than those resulted from single cold rolling process with the same total reduction conducted. The plastic strain ratio increases from 2.23 for single cold rolling process to 3.2 for double rolling process. The fish-bone structure was observed in all SCR and DCR samples. DCR annealed sample is made up of equiaxed grains of almost uniform size, whereas SCR annealed sample shows a duplex grain structure, consisting of both large and small-sized grains. （Ti＋Nb）C and Fe（Ti＋Nb）P type precipitates were very rarely observed in SCR annealed and DCR annealed steels. The intensity of {111}∥ND for the DCR annealing was higher than that for SCR annealing.

关键词： single cold rolling double cold rolling Nb Ti IF steel structure texture

Low Calf Circumference Predicts Nutritional Risks in Hospitalized Patients Aged More Than 80 Years

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2019年第8期32卷 571-577页

作者： zhang xiao yan zhang Xing Liang ZHU Yun Xia TAO Jun zhang Zhen zhang Yue WANG yan yan KE Ying Ying REN Chen Xi XU Jun ZHONG Yuan Department of Geriatrics Shanghai Jiaotong University Affiliated Sixth People’s Hospital

Objective The aim of this study was to determine whether low calf circumference(CC) could predict nutritional risk and the cutoff values of CC for predicting nutritional risk in hospitalized patients aged ≥ 80 *** A total of 1,234 consecutive patients aged ≥ 80 years were enrolled in this *** admission, demographic data, CC, and laboratory parameters were *** with Nutritional Risk Screening 2002(NRS-2002) total score ≥ 3 were considered as having nutritional *** CC values were significantly lower in patients with nutritional risk compared to those in patients without nutritional risk [27.00(24.50-31.00) vs.31.00(29.00-33.50], P < 0.001].CC was negatively correlated with age and nutritional risk *** regression analysis of nutritional risk revealed that body mass index, albumin level, hemoglobin level, cerebral infarction, neoplasms, and CC(OR, 0.897;95% confidence interval, 0.856-0.941;P < 0.001) were independent impact factors of nutritional *** risk scores increased with a decrease in *** men, the best CC cutoff value for predicting nutritional risk according to the NRS-2002 was 29.75 *** women, the cutoff value was 28.25 *** CC is a simple, noninvasive, and valid anthropometric measure to predict nutritional risk for hospitalized patients aged ≥ 80 years.

关键词： Calf circumference Nutritional risk NRS-2002

Effects of two novel nucleoside analogues on different hepatitis B virus promoters

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第12期14卷 1836-1841页

作者： Xing-Xing He Ju-Sheng Lin Ying Chang Ying-Hui zhang yan Li xiao-yan Wang Dong Xu xiao-Ming Cheng Instituteof liver diseases Tongji Hospital of Tongji Medical Co11~g~Huazhong University of Science and Technology Wuhan 430030Hubei Province China

AIM： To explore the effects of the nucleoside analogues β-L-D4A and β-LPA on hepatitis B virus （HBV） promoters. METHODS： Four HBV promoters were amplified by polymerase chain reaction （PCR） and subcloned into the expression vector pEGFP-1. The four recombinants controlled by HBV promoters were confirmed by restriction analysis and sequencing. Human hepatoma HepG2 cells transfected with the recombinant plasmids were treated with various concentrations of β-L-D4A and β-LPA. Then, enhanced green fluorescent protein （EGFP）-positive cells were detected by fluorescence microscopy and using a fluorescence activated cell sorter RESULTS： Four HBV promoters were separately obtained and successfully cloned into pEGFP-1, Expression of EGFP under the control of the surface promoter （Sp） and the X promoter （Xp） was inhibited by β-L-D4A in a dosedependent manner, while expression of EGFP under the control of the core promoter （Cp） and Xp was inhibited by β-LPA in a dose-dependent manner. CONCLUSION： The two novel nucleoside analogues investigated here can inhibit the activities of HBV promoters in a dose-dependent manner. These findings may explain the mechanisms of action by which these two novel compounds inhibit HBV DNA replication.

关键词： Hepatitis B virus Nucleoside analogue Hepatitis B virus promoter Enhanced green fluorescentprotein Fluorescence activated cell sorter

System structural analysis of communication networks based on DEMATEL-ISM and entropy

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

Journal of Central South University 2017年第7期24卷 1594-1601页

作者： FU Kai XIA Jing-bo zhang xiao-yan SHEN Jian Information and Navigation College Air Force Engineering UniversityXi’an 710077China Tan Kah Kee College Xiamen UniversityZhangzhou 363105China

A method of system structural analysis based on decision making trial and evaluation laboratory together with interpretative structural modeling(DEMATEL-ISM) and entropy is proposed to clarify system structure of communication networks and analyze mutual influencing degree between different *** influencing degree and importance degree of elements are both considered to determine weights of elements,and the entropy of expert judgment results is used to omit unimportant influence relation and simplify system *** analysis on communication networks system shows that the proposed method can quantificationally present weights and mutual influencing degree of elements,and reasonably simplify system *** results indicate the rationality and feasibility of the method.

关键词： communication networks system structural analysis decision making trial and evaluation laboratory (DEMATEL) interpretative structural modeling (ISM) entropy

A novel way to synthesize Pb nanotapes in liquid ammonia

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第8期22卷 993-996页

作者： Lei Sun Meng Lei zhang xiao Jun Tao yan Bao Zhao Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng 475004 China

Lead nanotapes were synthesized in liquid ammonia solvent in the presence of sodium metal at low *** process was template *** electron microscopy（TEM） observations and X-ray diffraction（XRD） characterizations revealed that the as-prepared Pb nanotapes have average diameters in the range of 40-50 *** lengths up to several hundred nanometers, and exhibit cubic crystal structures.

关键词： Pb Nanotapes Chemical synthesis Liquid ammonia

Effect and mechanism of β-L-D4A on DNA polymerase α

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第46期13卷 6243-6248页

作者： yan Li Ju-Sheng Lin Ying-Hui zhang xiao-yan Wang Ying Chang Xing-Xing He Institute of Liver Diseases Tongji MedicalCollege Huazhong University of Science and Technology 1095Jiefang Street Wuhan 430030 Hubei Province China

AIM： To investigate the safety of β-L-D4A on DNA polymerase α.METHODS： Ion exchange chromatography was used to separate DNA polymerase cc from crude extract of human Hela cells. Detailed kinetic parameters were determined for β-L-D4A against DNA polymeraseα . RESULTS： DNA polymerase was purified with 4% yield and 31000 units/mg specific activity. The Michaelis constant （Km = 3.22 i^mol/L）, 50% inhibition concentration （IC50 = 178.49 μmol/L） and inhibition constant （Ki = 126 mol/L） of β-L-D4A were determined by kinetic analysis. CONCLUSION： β-L-D4A is a more safe nucleoside for hepatitis B virus （HBV） infection with a lower host toxicity.

关键词： Nucleoside β-L-D4A DNA polymeraseα Kinetic study Side effect Hepatitis B virus

Straw Application Altered CH_4 Emission,Concentration and ^(13)C-Isotopic Signature of Dissolved CH_4 in a Rice Field

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

Pedosphere 2012年第1期22卷 13-21页

作者： zhang xiao-yan zhang Guang-Bin JI yang MA Jing XU Hua CAI Zu-Cong State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) Graduate University of Chinese Academy of Sciences Beijing 100049(China)

CH4 emission and the concentration of dissolved CH4 in soil solution and floodwater in a rice field and their stable carbon isotopic signatures as affected by straw application were investigated in 2009 in a field experiment at Jurong, Jiangsu Province, China. Straw application increased CH4 emission and CH4 concentration in the soil solution and floodwater. A positive seasonal correlation was also observed in the variation between CH4 flux and CH4 concentration in soil solution. The seasonal total CH4 emission （51.6 g CH4 m^-2） in Treatment WS （straw applied） was about 168% higher than that in Treatment CK （without straw）. The emitted CH4 and CH4 in soil solution were initially relatively enriched, then depleted and finally enriched again in 13C in both treatments, while CH4 in floodwater became isotopically heavier. The carbon isotopic signature of emitted CH4 and CH4 in floodwater averaged around -62%o and -45%0 for both treatments, respectively, and was not significantly influenced by the application of straw. However, straw application caused the CH4 in soil solution to be significantly depleted in lac during the middle of the rice season, and the mean δ13C value was lower in WS （-57.5‰） than in CK （-49.9‰）. Calculation from the isotopic data showed that straw application increased the fraction of CH4 oxidized, causing no significant difference in the δ13C value of the emitted CH4 between the two treatments.

关键词： δ13CH4 CH4 flux CH4 oxidation floodwater soil solution