检索结果-南通市图书馆

World Journal of Gastroenterology 2006年第42期12卷 6884-6888页

作者： Zuo-Bing Chen Zi-Wei Wang Chen-Yan Ding Jian-Hua Yan Yuan Gao Yun Zhang Lin-Mei ni yong-Qing Zhou Department of Emergency Surgery First Affiliated Hospital College of Medicine Zhejiang University Hangzhou 310003 Zhejiang Province China

AIM: To study the effect of albumin administration on lung injury in trauma/hemorrhagic shock (T/HS). METHODS: Sixty experimental animals were randomly divided into three groups: rats undergoing laparotomy without shock (T/SS); rats with T/HS and resuscitation with blood plus twice the volume of shed blood as Ringer’s lactate (RL), and rats with T/HS and resuscitation with blood plus additional 3 mL of 50 g/L human albumin. Expression of polymorphonuclear neutrophil (PMN) CD11b/CD18, intercellular adhesion molecule-1 (ICAM-1) of jugular vein blood and the severity of lung injuries [determined mainly by measuring activity of lung tissue myeloperoxidase (MPO) and lung injury score (LIS)] were measured after a 3-h recovery period. RESULTS: All three groups showed a significant difference in the expressions of CD11b/CD18, ICAM-1, and severity of lung injury. The expressions of CD11b/ CD18 in T/SS group, T/HS + RL group, T/HS + albumin group were 17.76% ± 2.11%, 31.25% ± 3.48%, 20.36% ± 3.21%, respectively (F = 6.25, P nificantly increased compared to T/SS group (P = 0.025, P = 0.036, P = 0.028,respectively). However, administration of 3 mL of 50 g/L albumin significantly down-regulated the expressions of CD11b/CD18, ICAM-1 and lung injury index (MPO and LIS) when compared with the T/HS + RL rats (P = 0.035, P = 0.046, P = 0.038, P = 0.012, respectively). CONCLUSION: The infusion of albumin during resuscitation period can protect lung from injury and decrease the e

关键词： Albumin CD11b/CD18 Intercellular adhesion molecule-1 Lung injury Trauma/hemorrhagic shock

Strong Quantum Fluctuation of Vortices in Bulk Samples of the New Superconductor MgB_(2)

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

Chinese Physics Letters 2001年第6期18卷 816-819页

作者： WEN Hai-Hu LI Shi-Liang ZHAO Zhi-Wen ni yong-Ming REN Zhi-An CHE Guang-Can YANG Hai-Peng LIU Zhi-yong ZHAO Zhong-Xian National Laboratory for Superconductivity Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

By using transport and magnetic measurement,the upper critical field H_(c2)(T)and the irreversibility line Hirr(T)has been determined.A big separation between H_(c2)(0)and Hirr(0)has been found showing the existence of a quantum vortex liquid state induced by quantum fluctuation of vortices in the new superconductor MgB_(2).Further investigation on the magnetic relaxation shows that both the quantum tunneling and the thermally activated flux creep depends weakly on ***,when the melting field Hirr is approached,a drastic rise of the relaxation rate is *** may indicate that the melting of the vortex matter at a finite temperature is also induced by the quantum fluctuation of vortices.

关键词： temperature. quantum relaxation

SPECTROPHOTOMETRIC ANALYSIS OF MIXTURES OF TRACE METAL BY DOUBLE-SYSTEM AND MULTIVARIATE CALIRRATION

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

Chinese Chemical Letters 1993年第2期4卷 157-158页

作者： yong nian ni Xin Ming YIN Department of Chemistry,Jiangxi University,Nanchang,33007

In this paper,a new method for simultaneous spectrophotometric analysis of multi- component with double-system was *** multivariate calibration method,principal component analysis-partial least squares(PCA-PLS),was described and applied to the processing of measurement data.A demonstration,simultaneous determination of cobalt,nickel,copper,zinc and iron with double-system(5-Br-PADAP and PAR as chromogenic chelate reagents,respectively) was *** results showed that the method with douhle-system gave better precision than those with single system and MLR(in this paper,AKC method was selected)did not give satis- fied precision in any situation.

关键词： PLS PCR SPECTROPHOTOMETRIC ANALYSIS OF MIXTURES OF TRACE METAL BY DOUBLE-SYSTEM AND MULTIVARIATE CALIRRATION APPI RSD

Effects of surface modification on isothermal oxidation behavior of HVOF-sprayed niCrA1Y coatings

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2011年第2期21卷 173-179页

作者： Li-yong ni,Zi-long WU,Chun-gen ZHOU Key Laboratory of Aerospace Materials and Performance(Ministry of Education), Department of Materials Science and Engineering,Beihang University,Beijing 100191,China Key Laboratory of Aerospace Materials and Performance (Ministry of Education) Department of Materials Science and Engineering Beihang University

niCrAlY coatings were deposited on ni-based superalloy by high-velocity oxygen-fuel spraying(HVOF).Surface modification by means of grit-blasted,shot-peened and ground methods was used in order to study the effect of surface conditions on the isothermal oxidation behavior of HVOF-sprayed niCrAlY coatings at 1 050℃.The results showed that surface modification had an obvious effect on the isothermal oxidation behavior of the *** was a large decrease in growth rate compared with the as-sprayed *** scale formed on the grit-blasted and shot-peened coatings was a mixture of Al2O3and niCr2O4,while the oxide formed on the ground coating was composed mainly of *** surface modification,the content of niCr2O4spinels decreased compared with the as-sprayed coating.

关键词： niCrAlY HVOF isothermal oxidation thermal barrier coating

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

马克思主义正义观及其当代走向

武汉大学学报（人文科学版） 2007年第4期60卷 446-452页

作者：倪勇山东理工大学社会学系山东淄博255049

马克思主义经典作家没有就正义问题作专门的、系统性的阐述,但这并不意味着正义问题处于马克思主义的视野之外。事实上,马克思主义正义观不仅科学、系统,而且给历史以巨大的影响。当代世界日新月异,与此相关,各种各样的正义理论层出不... 详细信息

马克思主义经典作家没有就正义问题作专门的、系统性的阐述,但这并不意味着正义问题处于马克思主义的视野之外。事实上,马克思主义正义观不仅科学、系统,而且给历史以巨大的影响。当代世界日新月异,与此相关,各种各样的正义理论层出不穷。具有竞争性的理论、社会的深刻变化,成为马克思主义正义观不得不面对的严峻挑战。一个巨大的问号横亘在我们面前:马克思主义正义观向何处去?

关键词：马克思主义正义观危机走向

基于主成分分析和神经网络的近红外光谱苹果品种鉴别方法研究

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2006年第5期26卷 850-853页

作者：何勇李晓丽邵咏妮浙江大学生物工程与食品科学学院浙江杭州310029

提出了一种用近红外光谱技术快速鉴别苹果品种的新方法,首先用主成分分析法对苹果品种进行聚类分析并获取苹果的近红外指纹图谱,再结合人工神经网络技术进行品种鉴别。主成分分析表明,主成分1和主成分2的累积可信度已达98%,以主成分1和... 详细信息

提出了一种用近红外光谱技术快速鉴别苹果品种的新方法,首先用主成分分析法对苹果品种进行聚类分析并获取苹果的近红外指纹图谱,再结合人工神经网络技术进行品种鉴别。主成分分析表明,主成分1和主成分2的累积可信度已达98%,以主成分1和2对所有建模样本的得分值做出的得分图,对不同种类苹果具有很好的聚类作用。利用主成分分析得到的载荷图可以得到对于苹果品种敏感的特征波段,用特征波段图谱作为神经网络的输入建立三层BP人工神经网络模型。每个品种各25个苹果共75个用来建立神经网络模型,余下的共15个用于预测。对未知的15个样本进行预测,品种识别准确率达到100%。说明文章提出的方法具有很好的分类和鉴别作用,为苹果的品种鉴别提供了一种新方法。

关键词：近红外光谱苹果主成分分析人工神经网络聚类

Characteristics of proppant transport and placement within rough hydraulic fractures

在线全文

学校读者我要写书评

暂无评论

Petroleum Exploration and Development 2024年第2期51卷 453-463页

作者： HUANG Hai ZHENG yong WANG Yi WANG Haizhu ni Jun WANG Bin YANG Bing ZHANG Wentong School of Petroleum Engineering Xi’an Shiyou UniversityXi’an 710065China Shaanxi Key Laboratory of Carbon Dioxide Sequestration and Enhanced Oil Recovery Xi’an 710075China Shaanxi Provincial Key Laboratory of Oil and Gas Well and Reservoir Seepage and Rock Mechanics Xi’an 710065China Oil&Gas Field Production Construction Division PetroChina Tarim Oilfield CompanyKorla 841000China National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China Shaanxi Yanchang Petroleum(Group)Co. Ltd.Xi’an 710075China

A three-dimensional reconstruction of rough fracture surfaces of hydraulically fractured rock outcrops is carried out by casting process,a large-scale experimental setup for visualizing rough fractures is built to perform proppant transport *** typical characteristics of proppant transport and placement in rough fractures and its intrinsic mechanisms are investigated,and the influences of fracture inclination,fracture width and fracturing fluid viscosity on proppant transport and placement in rough fractures are *** results show that the rough fractures cause variations in the shape of the flow channel and the fluid flow pattern,resulting in the bridging buildup during proppant transport to form unfilled zone,the emergence of multiple complex flow patterns such as channeling,reverse flow and bypassing of sand-carrying fluid,and the influence on the stability of the sand *** proppant has a higher placement rate in inclined rough fractures,with a maximum increase of 22.16 percentage points in the experiments compared to vertical fractures,but exhibits poor stability of the sand *** fracture width aggravates the bridging of proppant and induces higher pumping *** the viscosity of the fracturing fluid can weaken the proppant bridging phenomenon caused by the rough fractures.

关键词： reservoir fracturing rough fracture proppant transport and placement characteristics bridging buildup

近红外光谱法结合模式识别方法对不同品牌牙膏进行质量监控

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2011年第8期31卷 2106-2108页

作者：林薇倪永年南昌大学食品科学与技术国家重点实验室江西南昌330047 南昌大学化学系江西南昌330031

采用了近红外光谱法测定了4个品牌牙膏样品的近红外光谱,然后对所得的光谱进行变量预处理,再运用偏最小二乘法(PLS)、人工神经网络法(ANN)和K-最近邻法(KNN)等几种有监督模式识别法,以及主成分分析(PCA)和聚类分析两种无监督模式识别法... 详细信息

采用了近红外光谱法测定了4个品牌牙膏样品的近红外光谱,然后对所得的光谱进行变量预处理,再运用偏最小二乘法(PLS)、人工神经网络法(ANN)和K-最近邻法(KNN)等几种有监督模式识别法,以及主成分分析(PCA)和聚类分析两种无监督模式识别法对样品进行了品牌的分类及聚类分析。结果表明采用近红外光谱法所得的光谱变量经多元散射处理后的分类结果比较理想。各品牌牙膏的质量相对是稳定,但在采集的四种品牌牙膏中,有两种品牌的牙膏样品间存在较大差异。

关键词：近红外光谱法模式识别牙膏质量监控

在线全文

学校读者我要写书评

暂无评论

速差动力学分析法同时测定铁、锌、铜

高等学校化学学报 1999年第4期20卷 529-533页

作者：倪永年刘超南昌大学化学系

将化学计量学方法引入速差动力学分析方法中，在不预知动力学模型参数（速率常数）的情况下，用人工神经网络（ＡＮＮ）依据铁、锌、铜的ＥＧＴＡ配合物与ＰＡＲ置换反应的速度差异，对其三组分混合体系进行了同时测定．并对人工神经网... 详细信息

将化学计量学方法引入速差动力学分析方法中，在不预知动力学模型参数（速率常数）的情况下，用人工神经网络（ＡＮＮ）依据铁、锌、铜的ＥＧＴＡ配合物与ＰＡＲ置换反应的速度差异，对其三组分混合体系进行了同时测定．并对人工神经网络和偏最小二乘法对多波长、多时间点的三维量测模型的解析能力进行了比较，结果表明前者总体上优于后者．混合体系中铁、锌、铜测定的相对标准偏差分别为１．６３％，３．２９％和４．４１％．本法还被用于饲料添加剂中微量元素的测定。

关键词：速差动力学分光光度法铁锌铜测定