检索结果-南通市图书馆

Homogenization Theory for a replenishing Passive Scalar Field

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2009年第5期30卷 631-644页

作者： peter r. KrAMEr Shane r. KEATING Department of Mathematical Sciences Rensselaer Polytechnic Institute Center for Atmosphere-Ocean Science Courant Institute of Mathematical SciencesNew York University

Homogenization theory provides a rigorous framework for calculating the effective diffusivity of a decaying passive scalar field in a turbulent or complex *** authors extend this framework to the case where the passive scalar fluctuations are continuously replenished by a source (and/or sink).The basic structure of the homogenized equations carries over,but in some cases the homogenized source can involve a non-trivial coupling of the velocity field and the *** authors derive expressions for the homogenized source term for various multiscale source structures and interpret them physically.

关键词： Homogenization Turbulent transport Source Pumping

Long-term antifibrotic action of interferon-γ treatment in patients with chronic hepatitis B virus infection

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2011年第2期10卷 151-157页

作者： peter r Mertens Steven Dooley Department of Nephrology and Hypertension Otto-von-Guericke-University First Affiliated Hospital Zhejiang University School of Medicine Molecular Hepatology-Alcohol Dependent Diseases II. Medical Clinic Faculty of Medicine at MannheimUniversity of Heidelberg

BACKGrOUND:The first priority in treating fibrosis is to eliminate the causes that result in liver injury,e.g.,hepatitis B and C ***,in many liver diseases the cause is either unknown or *** present study was designed to investigate the long-term antifibrotic effect of interferon-gamma(IFN-γ)treatment in patients chronically infected with hepatitis B virus. METHODS:A total of 42 patients,30 treated with IFN-γand 12 controls,were enrolled from an original clinical trial(Clin Gastroenterol Hepatol 2005;3:819.).Three serial liver biopsies that were obtained at the initiation and end of IFN-γtreatment as well as 4 to 6 years after treatment discontinuation were assessed according to the modified Chevallier scoring system. rESULTS:Twenty-five out of 30 IFN-γ-treated patients were followed up until 4 to 6 years after the treatment was stopped. However,all controls were excluded from follow-up due to death,loss and elevated virus level within 2 ***-five IFN-γ-treated patients had stable serum liver function and liver fibrosis indices without any further antiviral or anti-fibrotic *** inflammatory and fibrotic scores were found after nine months of IFN-γtreatment according to the modified Chevallier scoring system(inflammation:11.8±6.5 at the beginning of IFN-γtreatment vs.9.2±4.1 after 9 months, Prosis:15.0±7.3 at baseline vs.12.6±6.8 after 9 months, Prd serial liver biopsy 4 to 6 years after treatment discontinuation,and the fibrotic score was increased(14.2±8.3 vs.11.9±7.6 after 9 months, Preatment significantly improves the fibrosis score in patients with chronic HBV *** majority of patients demonstrate stable serum biochemical indices and quality of ***,they do not show a long-term benefit according to histological criteria. Given the limited sample size,long-term IFN-γtreatment regimens should be assessed in further

关键词： hepatic stellate cells hepatitis B virus liver fibrosis inflammation interferon-gamma

Synthesis of Silsesquioxane Cages from Phenyl-cis-tetrol, 1,3-Divinyltetraethoxydisiloxane and Cyclopentyl resins

在线全文

学校读者我要写书评

暂无评论

Chemical research in Chinese Universities 2004年第4期20卷 433-436页

作者： Alan r. Bassindale peter G. Taylor Department of Chemistry Open UniversityDepartment of Chemistry Open University Walton Hall Milton Keynes MK7 6AA UKWalton Hall Milton Keynes MK7 6AA UK

The synthesis of T_8, T_ 10 and T_ 12 silsesquioxane cages from a range of starting materials: phenyl-cis-tetrol, 1,3-divinyltetraethoxydisiloxane and cyclopentyl T resins by using tetra n-butylammonium fluoride(TBAF) as the catalyst is described in this paper. The reaction yields obtained viathe current route are better compared to those viathe literature routes. Some of the cage compounds have been characterized by X-ray crystallography.

关键词： Synthesis Silsesquioxane cage Phenyl-cis-tetrol 1,3-Divinyltetraethoxydisiloxane Cyclopentyl T resin

Time to clinical response and remission for therapeutics in inflammatory bowel diseases: what should the clinician expect, what should patients be told?

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第35期23卷 6385-6402页

作者： Abhinav Vasudevan peter r Gibson Daniel r van Langenberg Department of Gastroenterology and Hepatology Eastern HealthBox Hill Hospital Monash University Eastern Health Clinical School Department of Gastroenterology Alfred Health and Monash University

An awareness of the expected time for therapies to induce symptomatic improvement and remission is necessary for determining the timing of follow-up, disease(re)assessment, and the duration to persist with therapies, yet this is seldom reported as an outcome in clinical trials. In this review, we explore the time to clinical response and remission of current therapies for inflammatory bowel disease(IBD) as well as medication, patient and disease related factors that may influence the time to clinical response. It appears that the time to therapeutic response varies depending on the indication for therapy(Crohn's disease or ulcerative colitis). Agents with the most rapid time to clinical response included corticosteroids, calcineurin inhibitors, exclusive enteral nutrition, aminosalicylates and anti-tumor necrosis factor therapy which will work in most patients within the first 2 mo. Vedolizumab,methotrexate and thiopurines had a longer time to clinical response and can take several months to achieve maximal efficacy. Factors affecting the time to clinical response of therapies included use of concomitant therapy, disease duration, smoking status, disease phenotype and advanced age. There appears to be marked variation in time to clinical response for therapies used in IBD which is further influenced by disease and patient related factors. Understanding the expected time to therapeutic response is integral to inform further decision making, maintain a patientcentered approach and ensure treatment is given an appropriate timeframe to achieve maximal benefit prior to cessation.

关键词： Crohn’s disease Clinical pharmacology Ulcerative colitis Thiopurines Inflammatory bowel disease Biologics nutrition

Farmers’knowledge,attitudes,and practices with respect to rodent management in the upland and lowland farming systems of the Lao People’s Democratic republic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2007年第3期2卷 165-173页

作者： peter r.BrOWN Khamouane KHAMPHOUKEO CSIrO Sustainable Ecosystems CanberraAustralian Capital TerritoryAustralia National Agricultural and Forestry research Institute VientianeLao PDR

rodents are a serious constraint to poor farmers in the upland and lowland farming systems of the Lao People’sDemocratic republic and have been described as the pest they have least control over. To better understand theseproblems a baseline survey of farmers was conducted to assess their knowledge, attitudes, and practices with respectto rodent management. A structured survey was conducted in 12 villages across Luang Namtha, Luang Prabang,and Houaphan provinces. Twenty farmers from each village were interviewed (a total of 240 farmers). Farmersnoted that the main factor limiting production was pests (70%), with rats identified as the most important pest(98%). The mean yield loss was estimated at 19% (range 0–100%). Trapping and rodenticides were commonlyused by farmers. Farmers believed that it was important to control rats and believed that rats could only be controlledif farmers worked together. However, 65% of farmers conducted rodent control by themselves, and 92% offarmers believed that rodenticides were harmful to the environment. The main constraints identified were the highcost of some control methods and the need to get farmers to work together as a community.

关键词： decision making farmers’beliefs pest rice rodent management upland crop

Vanishing Ideals of Projective Spaces over Finite Fields and a Projective Footprint Bound

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2019年第1期35卷 47-63页

作者： peter BEELEN Mrinmoy DATTA Sudhir r.GHOrPADE Department of Applied Mathematics and Computer Science Technical University of DenmarkDK 2800.Kgs.LyngbyDenmark Department of Applied Mathematics and Computer Science Technical University of DenmarkDK 2800Kgs.LyngbyDenmark Current address:Department of Mathematics and StatisticsUiT-The Arctic Unwersity ofNorwayN-9037TromsφNorway Department of Mathematics Indian Institute of Technology BombayPowaiMumbai 400076India

We consider the vanishing ideal of a projective space over a finite field. An explicit set of generators for this ideal has been given by Mercier and rolland. We show that these generators form a universal Gr¨obner basis of the ideal. Further we give a projective analogue for the so-called footprint bound, and a version of it that is suitable for estimating the number of rational points of projective algebraic varieties over finite fields. An application to Serre’s inequality for the number of points of projective hypersurfaces over finite fields is included.

关键词： Finite field projective space algebraic variety vanishing ideal Grbner basis footprint bound projective hypersurface

Isolated Bell's palsy-An unusual presentation of dengue infection

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2013年第1期6卷 82-84页

作者： Soumia peter Malhotra N peter P Sood r Department of Medicine Christian Medical College & Hospital Department of radiodiagnosis Christian Medical College & Hospital

Dengue fever is a very common arthropod-borne infection in tropical *** complications in dengue fever are relatively uncommon and among these,isolated cranial neuropathies have been reported only very *** present an unusual neurological complication of Bell’s palsy(lower motor neuron 7 th nerve palsy) associated with dengue *** the best of our knowledge,there have been very few documented cases of Flavivirus causing isolated Bell’s palsy.

关键词： Dengue infection Bell’s palsy

2010 World Expo and Urban Life Quality in Shanghai in Terms of Sustainable Development

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 Journal of Population,resources and Environment 2006年第1期4卷 15-22页

作者： Zhu Dajian peter r rogers Tongji University Shanghai 200092 China Harvard University MA02134 U.S.A

Based on sustainable development theory and the UN's Human Development Index, this thesis puts forward what the quality of urban life implies, makes a study of the world Expo's potential influences on the urban life o... 详细信息

关键词： World Expo urban life quality Shanghai

Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 737-743页

作者： peter P Vasil’ev richard V Penty Ian H white Centre for Photonic Systems Department of EngineeringUniversity of CambridgeCambridge CB30FAUK Quantum Electronics Division PN Lebedev Physical InstituteMoscow 119991Russia

This paper reports the observation of ultra-superluminal pulse propagation in multiple-contact semiconductor heterostructures in a superradiant emission regime,and shows definitively that it is a different class of emission from conventional spontaneous or stimulated *** population gratings induced in the semiconductor medium under strong electrical pumping have been shown to cause a major decrease of the group refractive index,in the range of 5–40%.This decrease is much greater than that caused by conventional carrier depletion or chirp *** decrease in refractive index in turn causes faster-than-c propagation of femtosecond *** measurement also proves the existence of coherent amplification of electromagnetic pulses in semiconductors at room temperature,the coherence being strongly enhanced by interactions of the light with coherent transient gratings locked to carrier *** pulse-generation technique is anticipated to have great potential in applications where highly coherent femtosecond optical pulses must be generated on demand.

关键词： phase transition population grating superradiance superluminal propagation