检索结果-南通市图书馆

Pion Cloud Effects on △-N Mass Splitting from Quark Models

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第8期38卷 189-194页

作者： DONG Yu-bing FENG qing-Guo Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100039 China Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100039 China

Pion cloud effects on △-N mass splitting are studied based on quark models. Pseudo-scalar pion-quarkcoupling is discussed in the relativistic and nonrelativistic frameworks. We separately calculate the pion cloud effects bythe one-pion exchange potential and by another method which is consistent with the baryon chiral perturbation *** able discrepancy in the mass splitting between the two methods is shown.

关键词： quark models, coupling constants, pion cloud, △-N mass splitting

血清CXCL13在类风湿关节炎中的表达及意义

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

中华实用诊断与治疗杂志 2018年第3期32卷 248-250页

作者：安乐美楚天舒刘谓刘冰朱清阎磊邵凤民郑州大学人民医院河南省人民医院肾病风湿科郑州450003

目的探讨类风湿关节炎(rheumatoid arthritis,RA)患者血清CXCL13表达及其临床意义。方法 RA患者81例为RA组,同期体检健康者21例为对照组,采用ELISA法检测2组血清CXCL13水平,比较以红细胞沉降率计算的28个关节疾病活动指数(disease activ... 详细信息

目的探讨类风湿关节炎(rheumatoid arthritis,RA)患者血清CXCL13表达及其临床意义。方法 RA患者81例为RA组,同期体检健康者21例为对照组,采用ELISA法检测2组血清CXCL13水平,比较以红细胞沉降率计算的28个关节疾病活动指数(disease activity score 28erythrocyte sedimentation rate,DAS28ESR)、临床疾病活动性指数(clinical disease activity index,CDAI)、简化的疾病活动性指数(simplified disease activity index,SDAI)。根据DAS28ESR将RA患者分为高、中、低度活动度者分别为21、26、34例,比较其血清CXCL13水平,DAS28ESR、SDAI及CDAI;Pearson相关法分析血清CXCL13与DAS28ESR、SDAI、CDAI的相关性;ROC曲线分析血清CXCL13诊断RA的效能。结果 RA组血清CXCL13水平[(97.17±54.43)ng/L]明显高于对照组[(42.91±10.71)ng/L](P0.05);RA高度活动度者DAS28ESR(6.25±0.86)、SDAI(36.55±14.24)、CDAI(32.97±11.94)均高于中度活动度者(4.08±0.60、15.34±6.14、13.73±4.87)及低度活动度者(2.17±0.61、3.58±2.99、3.12±2.79)(P<0.05),且中度活动度者高于低度活动度者(P<0.05);Pearson相关分析结果显示,RA组血清CXCL13水平与DAS28ESR、SDAI、CDAI均呈正相关(r=0.508,P<0.001;r=0.430,P<0.001;r=0.422,P<0.001);ROC曲线分析结果显示,血清CXCL13以55.67ng/L为最佳截断值,诊断RA的AUC为0.86(95%CI:0.78~0.94,P<0.001),准确率为71.95%,灵敏度为72.84%,特异度为99.11%。结论 RA患者血清CXCL13水平明显升高,且增高幅度与疾病活动度相关;血清CXCL13可作为评估RA患者病情严重程度的参考指标,在RA诊断中有较高价值。

关键词：类风湿关节炎 CXCL13 疾病活动度病情严重程度诊断

Photogrammetry Education for Multidisciplinary Geomatics in China

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2006年第4期9卷 273-280,305页

作者： zhu qing State Key Laboratory for Information Engineering in Surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China

After briefly reviews the history of photogrammetry education in China, the development of undergraduate and graduate program, and the corresponding curricula design are analyzed by use of the data from Wuhan University in which the photogrammetry is awarded as the state-level key discipline. The academic educational program of photogrammetry in universities has trained students to perform tasks in all fields of the photogrammetric profession. In recent years, the nature of photogrammetry is changing and multidisciplinary geomatics are developing very rapidly, the educational program of photogrammetry has also changed in new concepts and structures to adapt very new technologies and the extension of the field. Finally, the prospect of photogrammetry education for the requirements of multidiseiplinary geomatics is proposed. The growing interest in fast and accurate 3D spatial data collection （such as city modeling and digital earth） results in the increasing need of photogrammetry as principal tool, photogrammetric courses are therefore requested to be upto date and to become one kind of the fundamental professional courses for university geomatics and remote sensing degree programs.

关键词： photogrammetry education remote sensing geomatics China

An Overview of Epigenetics in Chinese Medicine Researches

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2017年第9期23卷 714-720页

作者： HU Xue-qing SU Shi-bing Research Center for Traditional Chinese Medicine Complexity System Shanghai University of Traditional Chinese MedicineShanghai201203China

Chinese medicine（CM） has contributed to human health care for several thousand years and is still popular in Asian countries. But the mechanisms underlying CM remain obscure, and need to be clarified by modern biological subjects and methods. Recently, CM researches on epigenetics have gained obvious improvement following rapidly developed molecular technologies. In this review, we revealed mutual characteristics of epigenetics and CM, such as holism, yin-yang dynamic nature, reversibility and balance, and visceral manifestation. Moreover, epigenetic modifications, including DNA methylation, histone post-transcriptional modifications, micro RNA interference, etc. may help explore the molecular basis of CM syndrome classification, and mechanisms of Chinese herbal medicine（CHM）, CHM compounds and Chinese herbal formulae activities. Meanwhile, CM and epigenetics might promote each other and jointly develop following the continuous progress of epigenetics in CM researches.

关键词： Chinese medicine epigenetics methylation histone modification Chinese herbal medicine,Chinese herbal formula Chinese medicine syndrome

Stabilization of Nonuniform Euler-Bernoulli Beam with Locally Distributed Feedbacks

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2012年第1期28卷 131-138页

作者： Xian-bing CAO qing-xu YAN Department of Mathematics School of SciencesBeijing Technology and Business UniversityBeijing 100048China Information Engineering School China Geosciences UniversityBeijing 100083China

In this article, we study the stabilization problem of a nonuniform Euler-Bernoulli beam with locally distributed feedbacks. Firstly, using the semi-group theory, we establish the well-posedness of the associated closed loop system. Then by proving the uniqueness of the solution of a related ordinary differential equations, we derive the asymptotic stability of the closed loop system. Finally, by means of the piecewise frequency domain multiplier method, we prove that the corresponding closed loop system can be exponentially stabilized by only one of the two distributed feedback controls proposed in this paper.

关键词： nonuniform Euler-Bernoulli beam linear locally distributed feedback control linear semigroup,exponential stability piecewise multiplier method

Hamilton-Souplet-Zhang's gradient estimates for two weighted nonlinear parabolic equations

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2017年第3期32卷 353-364页

作者： MA bing-qing HUANG Guang-yue Department of Mathematics Henan Normal University Xinxiang 453007 China

In this paper, we consider gradient estimates for positive solutions to the following weighted nonlinear parabolic equations on a complete smooth metric measure space with only Bakry-Émery Ricci tensor bounded below: One is $${u_t} = {\Delta _f}u + au\log u + bu$$ with a, b two real constants, and another is $${u_t} = {\Delta _f}u + \lambda {u^\alpha }$$ with λ, α two real constants. We obtain local Hamilton-Souplet-Zhang type gradient estimates for the above two nonlinear parabolic equations. In particular, our estimates do not depend on any assumption on f.

关键词： Hamilton’s gradient estimate Souplet-Zhang’s gradient estimate weighted nonlinear parabolic equation Bakry-Émery Ricci tensor

Surfactant-enhanced electrochemical detection of bisphenol A based on Au on ZnO/reduced graphene oxide sensor

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第4期42卷 1274-1282页

作者： Ai-Yun Zha qing-bing Zha Zhi Li Hong-Min Zhang Xue-Feng Ma Wen Xie Ming-Shan zhu Department of Nephrology The First Affiliated Hospital of Jinan UniversityGuangzhou510630China Department of Clinical Laboratory The Fifth Affiliated Hospital of Jinan University(Heyuan Shenhe People’s Hospital)Heyuan517000China Department of Obstetrics and Gynecology The First Affiliated Hospital of Jinan UniversityGuangzhou510630China Guangdong Key Laboratory of Environmental Pollution and Health School of EnvironmentJinan UniversityGuangzhou511443China

Bisphenol A(BPA),one of the most commonly used plastic organic monomers,is widely used in manufacturing food packaging and ***,the gradual emissions of BPA from manufacturing plastic products bring great potential in human health threats,which urgently need to develop a simple and rapid method for detecting *** bromide(CTAB),a typical surfactant,is used to enhance the electrochemical detection of trace endocrine disruptors due to the fact that it can effectively enrich and absorb hydrophobic phenolic compounds through the hydrophobicity of its long-chain *** on these,the present study reports a ternary composite of Au on zinc oxide/reduced graphene oxide nanosheets(Au/ZnO/rGO)as electrochemical sensor for detecting BP *** the addition of CTAB,the analytic performances toward BP A detection are significantly improved 3.8 times compared with those without *** pH,accumulation potential and time are ***,the electrochemical activity of CTAB/Au/ZnO/rGO sensor is also evaluated by cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS),differential pulse voltammetry(DPV)and scan *** sensor displays two linear range from 10to 1340 nmol·L^(-1)and 1340 to 10,000 nmol·L^(-1),and a low detection limit of 4.95 nmol·L^(-1).Lastly,the sensor also exhibits good reproducibility,selectivity and potential practical application for BPA detection in real samples.

关键词： Bisphenol A(BPA) Cetyltrimethylammonium bromide(TAB) Electrochemical detection(ED) Electron transmission

A NON-LINEAR MODEL FOR ESTIMATING THE COST OF ACHIEVING EMISSION REDUCTION TARGETS:THE CASE OF THE U.S.,CHINA AND INDIA

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2012年第3期21卷 297-315页

作者： Lei zhu Xiao-bing ZHANG Ying FAN Center for Energy & Environmental Policy Research Institute of Policy and Management Chinese Academy of Sciences Beijing 100190 China Department of Economics University of Gothenburg SE 40530 G teborg Sweden

With the world talking about climate change, the United States （U.S.）, China and India have announced their carbon emission reduction targets. For these three countries to achieve their targets, significant questions arise, shch as what will be the annual emission reduction efforts to achieve those targets, how much it would cost and what would be the economic effects. This paper puts the carbon intensity reduction targets of China and India together with the absolute emission reduction target of the U.S. into the same non-linear model to quantitatively study the optimal emission control strategies and associated total cost for achieving those targets by the year 2020, and estimate and compare the minimized total costs of the three countries to reach their targets. Our results show that the total cost for the U.S. to achieve its emission reduction target is greater than those of China and India in terms of absolute amount. However, in terms of proportion of total cost to GDP, China and India＇s ratios are significantly greater than that of the U.S., indicating that for the developing countries such as China and India, the achievement of emission reduction targets needs relatively greater effort.

关键词： Emission reduction cost analysis emission reduction strategy optimization model

Variability of Multiphoton Detachment Rate Versus Laser Intensity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1996年第5期13卷 355-358页

作者： WANG bing-bing zhu Qi-ren PAN Shou-fu Institute of Atomic and Molecular Physics Jilin University.Changchun 130023

With the help of a model calculation based on the R-matrix-Floquet theory,the variability of multiphoton detachment rate versus laser intensity is in detail investigated.A number of interesting regularities,which can ... 详细信息

关键词： perturbation theory lowest