检索结果-南通市图书馆

轻金属 1991年第8期 4-10页

作者： peter harris 冯秀纯

矿物资源真的有价值么?这正是关于矿藏价值的一次讨论会上,所收到的一份稿件的题目。关于矿藏的价值,自从前民主德国有迹象将其拥有的矿藏看成是新建公司的资产以来,现在已是一个热门话题。

关键词：矿床价值

New HIV test for infants seen as possible breakthrough for sub-Saharan Africa

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

空中英语教室（高级版．彭蒙惠英语） 2013年第5期 26-26,45页

作者： by peter Frost and Melissa harris

Advancing proteomics and machine learning in the clinic:an editorial on“Noninvasive proteomic biomarkers for alcohol-related liver disease”

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2022年第5期11卷 762-765页

作者： Courtney D.McGinnis Brenton I.M.Graham peter S.harris Kristofer S.Fritz Skaggs School of Pharmacy and Pharmaceutical Sciences University of Colorado Anschutz Medical CampusAuroraCOUSA

Alcohol-associated liver disease(ALD)is increasingly prevalent throughout the world(1).It remains the leading cause of liver-related morbidity and mortality worldwide and contributes to approximately 6%of global deaths(2).ALD encompasses a wide range of hepatic pathologies,including steatosis,steatohepatitis,fibrosis,and cirrhosis(3).Given the severe lack of therapeutic interventions available to reverse the progression of ALD,it is currently the leading indication for liver transplantation(4).Advancements within the field are needed to identify diagnostic biomarkers for early detection and to develop therapeutics to ameliorate hepatic dysfunction and pathologies associated with ALD.

关键词： hepatic liver mortality

Controlling and Evaluating the Structure and Morphology of Polymers on Multiple Scales

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 Materials Science and Chemical Engineering 2015年第12期3卷 48-60页

作者： Geoffrey R. Mitchell Ana Tojeira Thomas Gkourmpis James J. Holt peter harris Marilena Pezzuto Centre for Rapid and Sustainable Product Development Institute Polytechnic of Leiria Marinha Grande Portugal Innovation & Technology Borealis AB Stenungsund Sweden Department of Physics University of Reading Whiteknghts Reading UK Centre for Advanced Microscopy University of Reading Whiteknights Reading UK CNR-Istituto di Chimica e Tecnologia dei Polimeri Pozzuoli Italy

Crystalline polymers spontaneously form hierarchical structures although the precise manner in which these scales of structure are interconnected especially terms of the formation and evolution of the complete structure remains unclear. We have set out to control these scales of structure by introducing additional components which self-assemble in to nano-scale units which then direct the crystallisation of the polymer matrix. In other words, we first assemble a low concentration top-level structure which is designed to template or direct the sub-sequent crystallisation of the matrix polymer. This top level structure takes on the role of controlling the structure. We have set out to both establish the design principles of such structures and to develop experimental procedures which allow us to follow the formation of such complex hierarchical polymer structures. In particular we focus of the relationships between these different levels of structure and time sequence of events required for the structure to evolve in the targeted manner. In this programme, we have exploited time-resolving small-angle X-ray scattering and electron microscopy together with neutron scattering to probe and quantify the different scales of structure and their evolution. We highlight new neutron scattering instrumentation which we believe have great potential in the growing field of hierarchical structures in polymers. The addition of small quantities of nanoparticles to conventional and sustainable thermoplastics leads to property enhancements with considerable potential in a number of areas Most engineered nano-particles are highly stable and these exist as nano-particles prior to compounding with the polymer resin, they remain as nano- particles during the active use as well as in the subsequent waste and recycling streams. In this work we also explore the potential for constructing nano-particles within the polymer matrix during processing from organic compounds selected to provide nano

关键词： Component Semi-Crystalline Polymers Morphology Texture Nucleation Growth Shear Flow

高原野兔和旱獭血液动力学某些参数及心肺解剖组织学初步观察

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国应用生理学杂志 1989年第3期5卷 337-339页

作者：王谦隋官杰梁兵刘韵和 harris peter Anand I.S. 西藏自治区人民医院中国医学科学院阜外医院英国伦敦大学胸科研究所

实验方法从海拔4 200m以上地区捕获成年高原野兔和喜玛拉雅旱獭(MarmotaHimalayana)各两只,其身长、体重见表1。在3 658m的拉萨人工饲养三月后于1987年6月用硫喷妥钠基础麻醉和局麻下行右颈外静脉近心端插入热敏电阻Swan-Ganz导管,监测... 详细信息

实验方法从海拔4 200m以上地区捕获成年高原野兔和喜玛拉雅旱獭(MarmotaHimalayana)各两只,其身长、体重见表1。在3 658m的拉萨人工饲养三月后于1987年6月用硫喷妥钠基础麻醉和局麻下行右颈外静脉近心端插入热敏电阻Swan-Ganz导管,监测肺循环压力和每分心输出量后处死,按Fulton、Hutchinson、Jones氏法(1952)解剖心脏,称左室加室间隔、右室和全肺之重量,测左右心室壁厚度。肺脏用10%福尔马林液灌注固定72h,以Elastic Van Gieson法染色作组织学观察。

关键词：高原环境野兔旱獭血液动力学参数心肺解剖组织学

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

碳纳米管科学合成、性能及应用

国外科技新书评介 2010年第7期 17-18页

作者： peter J F harris（）刘儒平不详中国科学院电子所

碳纳米管已经成为现代科学热门的发展领域。分子尺度上的碳纳米管是最强的刚性纤维，具有显著的电学性能：在医药、传感等很多领域有广阔的应用前景。本书对碳纳米管学科做最简练的综述，介绍该领域基础的知识。

关键词：碳纳米管现代科学电学性能应用合成分子尺度

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

杂草生物防治作用物的风险评价

杂草生物防治作用物的风险评价

Management of ejaculatory disorders in infertile men

1995年全国生物防治学术讨论会

作者：万方浩 peter harris 中国农科院生防所 Agriculture and Agri-Food Canada Research StationLethbridgeABCanada TIT 4B1

杂草生防作用物的安全利用要求有一定的寄主范围,不为害其它非目标植物,传统上往往采用选择性实验来决定其安全利用的可靠性。然而,昆虫的寄主专一性具有一定的遗传基础,且往往受环境因子的影响。生防作用物在实验室条件下可能在某些同... 详细信息

杂草生防作用物的安全利用要求有一定的寄主范围,不为害其它非目标植物,传统上往往采用选择性实验来决定其安全利用的可靠性。然而,昆虫的寄主专一性具有一定的遗传基础,且往往受环境因子的影响。生防作用物在实验室条件下可能在某些同基因植物上发生取食并完成发育,但在田间条件下并不一定能完全利用这些植物。单一的选择性实验有可能摒弃有用

关键词：风险评价杂草生防天敌

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2012年第4期14卷 525-529页

作者： Yagil Barazani peter J Stahl harris M Nagler Doron S Stember Beth Israel Medical Center and the Albert Einstein College of Medicine of Yeshiva University New YorkNew York 10003USA Department of Urology Columbia University Medical CenterNew YorkNY 10003USA

Ejaculatory dysfunction is a highly prevalent clinical condition that may be classified along a continuum that ranges from premature ejaculation （PE）, through retarded or delayed ejaculation （DE）, to complete anejaculation （AE）. Retrograde ejaculation （RE） represents a distinct entity in which ejaculate is expelled either partially or completely into the bladder. While DE and PE are significant sources of sexual dissatisfaction among men and their partners, patients with these disorders retain normal fertility in most cases. Conversely, men with AE and RE are unable to deliver sperm into the female genital tract and are therefore rendered subfertile. Therefore, in reviewing ejaculatory disorders as they relate to fertility, this paper will primarily focus on the diagnosis and management of AE and RE. Physiology, diagnostic strategies, pharmacological treatments, and procedural interventions relevant to AE and RE are discussed.

关键词： anejaculation delayed ejaculation ejaculatory dysfunction electroejaculation penile vibratory stimulation prematureejaculation retrograde ejaculation

On (t, r) Broadcast Domination of Directed Graphs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Discrete Mathematics 2022年第3期12卷 78-100页

作者： Pamela E. harris peter Hollander Erik Insko Department of Mathematics and Statistics Williams College Williamstown MA USA Department of Mathematics Florida Gulf Coast University Fort Myers FL USA

A dominating set of a graph G is a set of vertices that contains at least one endpoint of every edge on the graph. The domination number of G is the order of a minimum dominating set of G. The (t, r) broadcast domination is a generalization of domination in which a set of broadcasting vertices emits signals of strength t that decrease by 1 as they traverse each edge, and we require that every vertex in the graph receives a cumulative signal of at least r from its set of broadcasting neighbors. In this paper, we extend the study of (t, r) broadcast domination to directed graphs. Our main result explores the interval of values obtained by considering the directed (t, r) broadcast domination numbers of all orientations of a graph G. In particular, we prove that in the cases r = 1 and (t, r) = (2, 2), for every integer value in this interval, there exists an orientation of G which has directed (t, r) broadcast domination number equal to that value. We also investigate directed (t, r) broadcast domination on the finite grid graph, the star graph, the infinite grid graph, and the infinite triangular lattice graph. We conclude with some directions for future study.

关键词： Directed Domination Directed Broadcasts Finite and Infinite Directed Grid Graphs

Biochemical and Molecular Epidemiology of Cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 1991年第1期4卷 73-92页

作者： HARUHIKO SUGIMURA AINSLEY WESTON NEIL E.CAPORASO peter G.SHIELDS ELISE D.BOWMAN ROBERT A.METCALF CURTIS C.harris Laboratory of Human Carcinogenesis Laboratory of Human CarcinogenesisEnvironmental Epidemiology Branch National Cancer Institute National Institutes of HealthLaboratory of Human CarcinogenesisLaboratory of Human CarcinogenesisLaboratory of Human CarcinogenesisLaboratory of Human Carcinogenesis Rockville Maryland 20892

Examples of practical approaches to molecular epidemiology of human cancer are described. Biomarkers of carcinogen exposure or inherited host factors for cancer susceptibility are discussed. Major advances have been made in the detection of carcinogen-macromolecular adducts through the use of high performance liquid chromatography, immunoaffinity chromatography, the 32P-postlabeling assay, enzyme immunoassays, gas chromatography/mass spectroscopy and synchronous spectrophotofluorimetry. The polycyclic aromatic hydrocarbon- DNA adducts are the most extensively studied in this field and together with antibodies to these adducts found in human serum, they have become useful indicators of exposure to carcinogens. Assays for various kinds of alky 1-DNA adducts have also been developed and the presence of these adducts have been documented in human tissues. Carcinogen-protein adducts have proven to be useful molecular dosimeters of carcinogen exposure. For example, 4-aminobiphenyl hemoglobin adducts are highly correlated with exposure to tobacco smoke. The study of the molecular aspects of interindividual differences in the metabolism and activation of xenobiotics and other genetic markers [DNA-restriction fragment length polymorphisms (RFLPs), mutations, and functional loss of specific genes in carcinogenesis] is an emerging new field that is discussed in the context of genetic susceptibility to cancer. The cytochrome P450 phenotypes and acetylation phenotype are examples of genetic markers that indicate an individual's potential for metabolism of exogenous substances. Further, inherited genetic polymorphic markers, e.g., DNA-RFLPs at protooncogene loci (HRAS-1 and L-myc) have been examined in a case-control study of lung cancer. Data concerning mutations of protooncogenes (H-, K-, and N-RAS) and tumor suppressor genes (retinoblastoma and p53 genes) in various common cancers are providing evidence of multiple genetic lesions that occur during the multistage process of ca

关键词： gene DNA Biochemical and Molecular Epidemiology of Cancer