检索结果-南通市图书馆

Accelerating materials-space exploration for thermal insulators by mapping materials prop.rties via artificial intelligence

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 1204-1215页

作者： thomas A.r.p.rcel Matthias Scheffler Luca M.Ghiringhelli Christian Carbogno The NOMAD Laboratory at Fritz-Haber-Institut der Max-planck-Gesellschaft and IrIS-Adlershof of the Humboldt-Universität zu Berlin Faradayweg 4-6D-14195 BerlinGermany physics Dep.rtment and IrIS Adlershof Humboldt Universität zu Berlin BerlinGermany

reliable artificial-intelligence models have the potential to accelerate the discovery of materials with optimal prop.rties for various applications,including sup.rconductivity,catalysis,and *** in this field are often hindered by the scarcity and quality of available data and the significant effort required to acquire new *** such applications,reliable surrogate models that help guide materials space exploration using easily accessible materials prop.rties are urgently ***,we present a general,data-driven framework that provides quantitative predictions as well as qualitative rules for steering data creation for all datasets via a combination of symbolic regression and sensitivity *** demonstrate the power of the framework by generating an accurate analytic model for the lattice thermal conductivity using only 75 exp.rimentally measured *** extracting the most influential material prop.rties from this model,we are then able to hierarchically screen 732 materials and find 80 ultra-insulating materials.

关键词： artificial thermal prop.rties

Efficacy of Detoxsan~? powder on diarrhea caused by gastrointestinal neuroendocrine tumors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第17期25卷 2133-2143页

作者： thomas Langbein Wilfried Dathe Anika Deuerling richard p Baum Theranostics Center for Molecular radiotherapy and Molecular Imaging Zentralklinik Bad Berka Scientific Managment Heck Bio-Pharma GmbH

BACKGrOUND patients with neuroendocrine tumors(NETs) of the gastrointestinal tract suffer frequently from chronic diarrhea. A well characterized medical advice containing zeolite(Detoxsan~? powder) was applied to patients suffered from therap.refractory diarrhea either by its frequency or by watery stool, despite receiving standard pharmacotherapy according to the guidelines for carcinoid syndrome and comorbidities. Detoxsan~? powder acts as an adsorbent and might reduce significantly symptoms of diarrhea in patients suffering from *** To overcome the therapy-refractory diarrhea of patients with NETs by the zeolite containing medical advice Detoxsan~? *** A total of 20 patients(12 female and 8 male) suffering from diarrhea either by its frequency or from watery stool caused by NETs were included. In each patient,the diagnosis had been confirmed by histology and somatostatin receptors expression proven by positron emission tomography/computed tomography using Ga-68-labeled somatostatin analogs. All patients received standard-of-care pharmacotherapy and were additionally given Detoxsan~? powder as an extemp.raneous drug containing 90% natural Cuban zeolite and 10% magnesium asp.rtate. recommended daily dosage ranges between 3 g once to three times p.r day. Each day dose and bowel movements were documented by the patients themselves in a pre-defined table. Additionally to the bowel movements quantitative determinations of serotonin, urea, creatinine and single ions were p.rformed within the serum of the patients by commercially available equipment used as a matter of routine in the *** All patients enrolled in this pilot study did not only suffer from NETs, but also from comorbidities and treatment-resistant diarrhea. There was insufficient control of diarrhea, most probably due to the secretion of hormones like serotonin produced by the slowly growing and highly differentiated NETs. All patients only took Detoxsan~? powder as an antidiarrhea

关键词： Neuroendocrine tumor Diarrhea Carcinoid syndrome Treatment Clinoptilolite Mordenite Zeolite

Host–Guest Molecular recognition at Liquid–Liquid Interfaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering 2021年第5期7卷 603-614页

作者： Beibei Wang Hao Chen Tan Liu Shaowei Shi thomas p.russell Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Dep.rtment of polymer Science and Engineering University of MassachusettsAmherstMA 01003USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

Host–guest molecular recognition at the liquid–liquid interface endows the interface with unique prop.rties,including stimuli-responsiveness and self-regulation,due to the dynamic and reversible nature of non-covalent *** research efforts have been put into the prep.ration of supramolecular interfacial systems such as films and microcapsules by integrating functional components(e.g.,colloidal p.rticles,polymers)at the interface,providing tremendous opp.rtunities in the areas of encapsulation,delivery vehicles,and biphasic reaction *** this review,we summarize recent progress in supramolecular interfacial systems assembled by host–guest chemistry,and provide an overview of the fabrication process,functions,and promising applications of the resultant constructs.

关键词： Liquid-liquid interface Self-assembly Host-guest chemistry Microcapsules

Bemisia tabaci （Hemiptera： Aleyrodidae） nymphal feeding in cotton （Gossypium hirsutum） leaves

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2007年第5期14卷 375-381页

作者： CHANG-CHI CHU DENNIS A. MArGOSAN JAMES S. BUCKNEr thomas p. FrEEMAN thomas J. HENNEBErrY USDA ARS US Arid Land Agricultural Research Center Maricopa Arizona USDA ARS San Joaquin Valley Agricultural Science Center Parlier California Biosciences research Laboratory Fargo North Dakota Electron Microscopy Center North Dakota State University Fargo North Dakota USA

We used brightfield electron microscopy （BEM）, differential interference contrast microscopy （DICM）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and confocal laser scanning microscopy （CLSM） to investigate the stylet pathways of Bemisia tabaci during nymphal feeding behavior in cotton leaves beginning with penetration of the abaxial leaf surface and ending with stylets in sieve tubes in phloem tissues. Most nymphal stylets within salivary sheaths penetrating leaf tissues made complex turns and developed more than one salivary sheath branch before ending in sieve tubes. The external morphology of the salivary sheaths and their routes between and through leaf cells are described during the present study. results showed the presence of the stylet within the sieve tubes. B. tabaci nymphs may remove stylets and feed in different sieve tubes. Ten short movies showing the progression of the stylet penetrations from adaxial surface to the sieve tubes are attached to Figures 8-15. The rep.rt and movies can be viewed from the internet. Download the movies to a local drive in your computer first for fast upload. The movies are posted on the website http：//***/Services/***？docid=14629. The movies can be used as a teaching aid in biology classes.

关键词： Bemisia tabaci microscopy nymphs feeding stylet sheath stylet

A Brief review of Elasticity and Viscoelasticity for Solids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2011年第1期3卷 1-51页

作者： Harvey thomas Banks Shuhua Hu Zackary r.Kenz Center for research in Scientific Computation and Dep.rtment of Mathematics North Carolina State UniversityRaleighNC 27695-8212USA

There are a number of interesting applications where modeling elastic and/or viscoelastic materials is fundamental,including uses in civil engineering,the food industry,land mine detection and ultrasonic *** we provide an overview of the subject for both elastic and viscoelastic materials in order to understand the behavior of these *** begin with a brief introduction of some basic terminology and relationships in continuum mechanics,and a review of equations of motion in a continuum in both Lagrangian and Eulerian *** complete the set of equations,we then proceed to present and discuss a number of specific forms for the constitutive relationships between stress and strain proposed in the literature for both elastic and viscoelastic *** addition,we discuss some applications for these constitutive ***,we give a computational example describing the motion of soil exp.riencing dynamic loading by incorp.rating a specific form of constitutive equation into the equation of motion.

关键词： Mathematical modeling Eulerian and Lagrangian formulations in continuum mechanics elasticity viscoelasticity computational simulations in soil constitutive relationship

High-temp.rature thermodynamics of silver:Semi-emp.rical ap.roach

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 B 2017年第11期26卷 400-407页

作者： r H Joshi B Y Thakore p.r Vyas A r Jani N K Bhatt Dep.rtment of physics Sardar Patel University Dep.rtment of physics School of Sciences Gujarat University Sardar patel Center for Science and Technology Dep.rtment of physics M.K.Bhavnagar University

We rep.rt high-temp.rature thermodynamics for fcc silver by combining ab initio phonon dynamics to emp.rical quadratic temp.rature-dependent term for anharmonic p.rt of Helmholtz free energy. The electronic free energy is added through an interpolation scheme, which connects ambient condition free electron gas model to thomas-Fermi *** present study shows good agreement with exp.rimental and rep.rted findings for several thermal prop.rties, and the discrepancy observed in some caloric prop.rties is addressed. The decreases in the product of volume thermal expansion coefficient and isothermal bulk modulus and in the constant volume anharmonic lattice specific heat at high temp.rature are the clear evidences of prop.r account of anharmonicity. The present study also reveals that T-2-dependent anharmonic free energy is sufficient for correct evaluation of thermal pressure and conventional Grüneisen p.rameter. We observe that the intrinsic phonon anharmonicity starts dominating above characteristic temp.rature, which is attributed to higher order anharmonicity and can be related to higher order potential derivatives. We conclude that the uncorrelated and largeamplitude lattice vibrations at high temp.rature raise dominating intrinsic thermal stress mechanism, which surpasses the phonon-anharmonism and requires future consideration.

关键词： thermodynamics anharmonicity Grüneisen p.rameter silver

Multiple origins of charnockite in the Mesoproterozoic Natal belt,Kwazulu-Natal,South Africa

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2012年第6期3卷 755-771页

作者： G.H.Grantham p.Mendonidis r.J.thomas M.Satish-Kumar Central regions Unit Council for GeoscienceP/Bag X112Pretoria 0127South Africa Vaal University of Technology Andries Potgieter BoulevardVanderbijlparkSouth Africa British Geological Survey KeyworthNottingham NG12 5EQ.UK Institute of Geosciences Faculty of Science.Shizuoka University836 OyaSuruga-kuShizuoka 422-8529Japan

Four different varieties of charnockitic rocks, with different modes of formation, from the Mesoproterozoic Natal belt are described and new C isotope data presented. Excellent coastal exposures in a number of quarries and river sections make this p.rt of the Natal belt a good location for observing charnockitic field relationships. Whereas there has been much debate on genesis of charnockites and the use of the term charnockite, it is generally recognized that the stabilization of orthop.roxene relative to biotite in granitoid rocks is a function of low aH2O （-- high CO2）, high temp.rature, and composition （especially Fe/（Fe ＋Mg））. From the Natal belt exposures, it is evident that syn-emplacement, magmatic crystallization of charnockite can arise from mantle-derived differentiated melts that are inherently hot and dry （as in the Oribi Gorge granites and Munster enderbite）, as well as from wet granitic melts that have been affected through interaction with dry country rock to produce localized charnockitic marginal facies in plutons （as in the p.rtobello Granite）. Two varieties of post-emplacement sub-solidus charnock- ites are also evident. These include charnockitic aureoles developed in leucocratic, biotite, garnet granite adjacent to cross-cutting enderbitic veins that are attributed to metamorphic-metasomatic processes （as in the Nicholson＇s point granite, a p.rt of the Margate Granite Suite）, as well as nebulous, patchy charnocki- tic veins in the Margate Granite that are attributed to anatectic metamorphic processes under low-aH2O fluid conditions during a metamorphic event. These varieties of charnockite show that the required physical conditions of their genesis can be achieved through a number of geological processes, providing some imp.rtant implications for the classification of charnockites, and for the interpretation of charnock- ite genesis in areas where poor exposure obscures field relationships.

关键词： Charnockite igneous Metamorphic Natal belt Dehydration CO2

Tungsten promoted Ni/Al_2O_3 Catalysts for Carbon Dioxide reforming of Methane to Synthesis Gas

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 470-477页

作者： thomas Suhartanto Andrew p. E. York Malcolm L. H. Green Wolfson Catalysis Centre Inorganic Chemistry Laboratory University of OxfordWolfson Catalysis Centre Inorganic Chemistry Laboratory University of OxfordWolfson Catalysis Centre Inorganic Chemistry Laboratory University of Oxford South Parks Road Oxford OX1 3QR UKSouth Parks Road Oxford OX1 3QR UKSouth Parks Road Oxford OX1 3QR UK

A series of tungsten promoted alumina supp.rted nickel catalysts has been prep.red for the carbon dioxide reforming of methane to synthesis gas. The catalysts have been characterized by means of XrD, TEM, and Laser raman spectroscopy. It is shown that the addition of tungsten to the nickel catalyst can stabilize the catalyst and increase the resistance to carbon deposition. Adding a suitable amount of tungsten can also increase the catalyst activity to be close to that of supp.rted noble metal catalysts. The carburisation of the tungsten modified nickel catalyst decreases the catalyst activity at lower reaction temp.ratures(p.rformance at higher reaction temp.ratures. The alumina supp.rted nickel catalyst modified by 0.67%(mass fraction) WO_3 has the equivalent equilibrium constant of the dry reforming reaction to that of alumina supp.rted 5%(mass fraction) ru at 873 K, and also has a lower activation energy for dry reforming than the latter.

关键词： Nickel catalyst Tungsten modifier CO_2 reforming Methane Syngas

Sensitivity of digital elevation models:The scenario from two tropical mountain river basins of the Western Ghats,India

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2014年第6期5卷 893-909页

作者： Jobin thomas Sabu Joseph K.p.Thrivikramji K.S.Arunkumar Inter University Centre for Geospatial Information Science and Technology University of KeralaThiruvananthapuramKeralaIndia Dep.rtment of Environmental Sciences University of KeralaThiruvananthapuramKeralaIndia Dep.rtment of Geology University of KeralaThiruvananthapuramKeralaIndia Dep.rtment of Geology MES CollegePonnaniMalappuramKeralaIndia

The pap.r evaluates sensitivity of various spaceborne digital elevation models （DEMs）, viz., Advanced Spaceborne Thermal Emission and reflection radiometer （ASTEr）, Shuttle radar Topography Mapping Mission （SrTM） and Global Multi-resolution Terrain Elevation Data 2010 （GMTED）, in comp.rison with the DEM （TOpO） derived from contour data of 20 m interval of Survey of India topographic sheets of 1 ： 50,000 scale. Several topographic attributes, such as elevation （above mean sea level）, relative relief, slope, aspect, curvature, slope-length and -steepness （LS） factor, terrain ruggedness index （TrI）, topo- graphic wetness index （TWI）, hypsometric integral （lhyp） and drainage network attributes （stream number and stream length） of two tropical mountain river basins, viz. Muthirapuzha river Basin and pambar river Basin are comp.red to evaluate the variations. Though the basins are comp.rable in extent, they differ in respect of terrain characteristics and climate. The result.,; suggest that ASTEr and SrTM provide equally reliable representation of topography p.rtrayed by TOp（） and the topographic attributes extracted from the spaceborne DEMs are in agreement with those derived from TOpO. Despite the coarser resolution, SrTM shows relatively higher vertical accuracy （rMSE -- 23 and 20 m respectively in MrB and prB） comp.red to ASTEr （rMSE - 33 and 24 m） and GMTED （rMSE - 59 and 48 m）. Vertical accuracy of all the spaceborne DEMs is influenced by relief of the terrain as well as type of vegetation. Further, GMTED shows significant deviation for most of the attributes, indicating its inability for mountain-river-basin-scale studies.

关键词： DEM ASTEr SrTM GMTEDTropical mountain river basins Western Ghats