检索结果-南通市图书馆

A Local Velocity Grid Approach for BGK Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2014年第9期16卷 956-982页

作者： Florian bernard Angelo Iollo Gabriella Puppo Department of Mechanical and Aerospace Engineering Politecnico di Torino10129 TorinoItaly. Univ.Bordeaux IMBUMR 5251F-33400 TalenceFrance.INRIAF-33400 TalenceFrance. Dip.di Scienza ed Alta Tecnologia Universita dell’InsubriaComoItaly

The solution of complex rarefied flows with the BGK equation and the Discrete Velocity Method(DVM)requires a large number of velocity grid points leading to significant computational *** propose an adaptive velocity grid approach exploiting the fact that locally in space,the distribution function is supported only by a sub-set of the global velocity *** velocity grid is adapted thanks to criteria based on local temperature,velocity and on the enforcement of mass *** in 1D and 2D are presented for different Knudsen numbers and compared to a global velocity grid BGK solution,showing the computational gain of the proposed approach.

关键词： Kinetic models BGK model discrete velocity method

固体催化剂是否成功地仿效酶催化剂？(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

催化学报 2010年第8期31卷 859-871页

作者： bernard DELMON Université catholique de Louvain CATACatalysis and Chemistry of Disperse MaterialsPlace Croix du Sud 2/17B-1348 Louvain-la-NeuveBelgium

In many aspects,similitude exists between man-made catalysts and *** scientific insight into this similitude stimulate new research directions in catalysis? More precisely,can the understanding of the mechanisms of activity control in enzymes suggest new advances for man-made catalysts? Indeed,it is already possible to design catalysts with (i) new structures (*** of several phases) and (ii) a better balance between the roles of the different *** ambition is to keep the essential advantages of solids as catalysts,in particular robustness,easy separation from products,and tolerance to high temperatures,while adding the advantages typical of enzymes,like more activity,allostery,and more precise control of selectivity,in particular *** ambition is to build a bridge between robust man-made functional solids and fragile but extremely selective *** that,results from a line of the work in our group will be used.

关键词： inorganic catalyst enzyme activity selectivity

ENHANCED FLUORESCENCE IMAGING WITH DMSO-MEDIATED OPTICAL CLEARING

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2010年第3期3卷 153-158页

作者： SANJEEV KARMA JAMES HOMAN CHARLES STOIANOVICI bernard CHOI Department of Biomedical Engineering University of California IrvineCA 92697USA Department of Developmental and Cell Biology University of California IrvineCA 92697USA Department of Chemistry University of California IrvineCA 92612USA Beckman Laser Institute University of California IrvineCA 92612USA Edwards Lifesciences Center for Advanced Cardiovascular Technology University of California IrvineCA 92697USA

Recent studies have demonstrated that topical application of glycerol on intact skin does not affect its optical scattering *** from our research group recently revisited the use of dimethyl sulfoxide(DMSO)as an agent with optical clearing *** address the use of optical clearing to enhance quantitation of subsurface fluorescence *** employed both in vitro and in vivo model systems to study the effect of topical DMSO application on fluorescence *** in vitro experiments performed on a tissue-simulating phantom suggest that DMSO-mediated optical clearing enables enhanced characterization of subsurface *** topical DMSO application,a marked increase in fluorescence emission was *** 30 min,the fluorescence signal at the DMSO-treated site was 9×greater than the contralateral saline-treated *** ratio increased to 13×at 105 min after agent *** summary,DMSO is an effective optical clearing agent for improved fluorescence emission quantitation and warrants further study in preclinical in vivo *** on outcomes from previous clinical studies on the toxicity profile of DMSO,we postulate that clinical application of DMSO as an optical clearing agent,can be performed safely,although further study is warranted.

关键词： Glycerol spectroscopy fluorescein toxicity

Effects of Cooking on Anthocyanin Concentration and Bioactive Antioxidant Capacity in Glutinous and Non-Glutinous Purple Rice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rice science 2018年第5期25卷 270-278页

作者： Supaporn YAMUANGMORN bernard DELL Chanakan PROM-U-THAI Agronomy Division Department of Plant and Soil Sciences Faculty of Agriculture Chiang Mai University Office of the Deputy Vice Chancellor Murdoch University Lanna Rice Research Center Chiang Mai University

Purple rice is a source of bioactive antioxidants for rice consumers. Loss of the major antioxidant compounds after a range of cooking processes was evaluated by measuring the changes in anthocyanin concentration （ATC） and antioxidant capacity （DPPH activity） of four non-glutinous and four glutinous genotypes. However, soaking in water prior to cooking generally decreased more ATC and antioxidant capacity in non-glutinous than in glutinous genotypes. Wet cooking （WC） and soaking before wet cooking （S-WC） led to lose almost all the ATC and antioxidant capacity with only slight variation between genotypes. In the glutinous genotype Pieisu, which had the highest raw rice ATC, ATC remained the highest when cooked by the WC method. By contrast, almost no ATC remained after WC and S-WC in the low ATC genotypes such as Kum Doi Saket. Overall, the loss of ATC was greater in non-glutinous than in glutinous genotypes for both WC and S-WC methods, but the reverse occurred for antioxidant capacity. WC using electric rice cooker retained higher ATC than the pressure cooking. Thus, for genotypes with high ATC and antioxidant capacity, the selection of cooking method is critical for retaining and stabilizing rice quality.

关键词： purple rice rice cooking anthocyanin antioxidant capacity wet cooking

Biosurfactants as a Biological Tool to Increase Micronutrient Availability in Soil: A Review

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2018年第2期28卷 170-189页

作者： Ratan SINGH bernard R.GLICK Dheeraj RATHORE School of Environment and Sustainable Development Central University of Gujarat Department of Biology University of Waterloo

Addressing micronutrient deficiencies in agricultural soils to meet the growing demands of crops is a matter of great concern *** use of biosurfactant,a multifunctional microbial metabolite,to enhance nutrient availability may be a sustainable way of enhancing agricultural *** are generally less toxic than synthetic *** application of biosurfactants in agricultural soils is anticipated to improve nutrient status,increase wettability,and achieve a more even dissemination of complex *** studies have evaluated the influence of biosurfactants on bioremediation,antimicrobial activity,and soil flushing *** manuscript reviews the possibility of employing biosurfactants to mobilize and solubilize soil nutrients and make them available to plants through the formation of metal-biosurfactant *** significant progress regarding an explanation of the mechanisms behind many biosurfactant-induced effects has been made,there are still many aspects of this area that are not sufficiently elucidated,such as differences in specificity for nutrients(e.g.,Cu,Fe,Mn,and Zn)and toxins(e.g.,Cd and Pb).Biosurfactants from various isolates have been considered for their potential role in plant growth promotion and other applications related to improving the effectiveness of agricultural soils.

关键词： critical micelle concentration micelle formation microbial metabolite microbial isolate micronutrient deficiency soilmetal bioavailability

Energy evolution in complex impacts with friction

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第5期56卷 875-881页

作者： ZHANG HongJian LIU CaiShan ZHAO Zhen BROGLIATO bernard State Key Laboratory for Turbulence and Complex Systems College of EngineeringPeking University School of Aeronautic Science and Engineering Beihang University INRIA BIPOP project-teamZIRST Montbonnot655 avenue de l'EuropeSaint Ismier 38334France

In this paper, we base a theory established in an impulse-energy level to solve a problem of a disk-bail system, in which a moving ball collides perpendicularly against an disk staying on a horizontal surface. The impact process is an ensemble con- sisting of a point impact coupled with a line contact between bodies of the disk, the ball and the fixed horizontal surface. We experimentally and theoretically show that the post-impact states of the disk dramatically vary with the impacting position of the ball. Explanations are given by investigating the evolutions of the potential energies resided in the points involved in the complex frictional impacts. Good agreements between numerical and experimental results strongly suggest that the evolution of energy together with the dissipation must be reflected in mathematical models if a precise description for the post-impact state of systems is expected.

关键词： complex impact friction non-smooth mechanics disk-ball system experiments

Responses of Tree Species to Climate Warming at Different Spatial Scales

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2011年第4期21卷 427-436页

作者： LIANG Yu HE Hong S LEWIS bernard L State Key Laboratory of Forest and Soil Ecology Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China School of Natural Resources University of Missouri-Columbia203m Anheuser-Busch Natural Resources BuildingColumbiaMissouri 65211-7270USA Graduate University of Chinese Academy of Sciences Beijing 100049China

Tree species respond to climate change at multiple scales,such as species physiological response at fine scale and species distribution (quantified by percent area) at broader spatial *** a given spatial scale,species physiological response and distribution can be correlated positively or *** consistency of such correlation relationships at different spatial scales determines whether species responses derived from local scales can be extrapo-lated to broader spatial *** this study,we used a coupled modeling approach that coupled a plot-level ecosystem process model (LINKAGES) with a spatially explicit landscape model (LANDIS).We investigated species physio-logical responses and distribution responses to climate warming at the local,zonal and landscape scales respectively,and examined how species physiological response and distribution correlated at each corresponding scale and whether the correlations were consistent among these *** results indicate that for zonal and warming-sensitive species,the correlations between species physiological response and distribution are consistent at these spatial scales,and therefore the research results of vegetation response to climate warming at the local scale can be extrapolated to the zonal and landscape *** contrast,for zonal and warming-insensitive species the correlations among different spatial scales are consistent at some spatial scales but at other *** results also suggest that the results of azonal species at the local scale near their distribution boundaries can not be extrapolated simply to broader scales due to stronger responses to climate warming in those boundary regions.

关键词： climate warming vegetation response local scale zonal scale landscape scale LANDIS Changbai Mountains

***-an interactive climate analysis web platform

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2021年第3期14卷 338-356页

作者： Laura Zepner Pierre Karrasch Felix Wiemann Lars bernard Chair of Geoinformatics Technische Universität DresdenDresdenGermany AED-SICAD GmbH BonnGermany

This article describes the conception and implementation of a web platform which uses special charts and maps for climate monitoring and *** first it gives an overview of related web applications and their advantages and *** is followed by a basic introduction of current technologies and methods for working with climate data,geospatial web services and visualization ***,the implementation based on prior defined requirements is presented and its strengths and limitations are *** application provides several basic charts for climate analysis,as well as a more complex one which uses a standardized visualization concept which is suitable for comparing different local climates(Walter-LiethStandard).The charts are based on different interpolated datasets with global coverage as well as data from the Global Historical Climate Network(GHCN).Overall,the application enables users to generate individual historical climate charts from the beginning of the twentieth century until present day.

关键词： Climate monitoring WalterLieth charts Köppen-Geiger classification user interface design education information visualization

1:5 0000 SCALE TOPOGRAPHIC MAPPING IN WEST CHINA USING SPOT 5 DATA

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

测绘科学 2008年第S2期33卷 25-27,9页

作者： M.bernard

On the one hand,the successful launch of the SPOT 5 satellite in 2002 can be seen as a milestone for DEM extraction and mapping,because its payload includes HRS,a stereoscopic imaging instrument devoted to collection of large *** in panchromaticmode,the HRS instrument has two telescopes,one pointing forward and one aft of the *** is thus able to cover an area of 600 km×120 km in a single pass(ie 72000 km^2 stereoscopic strips).Moreover,SPOT 5 is able to collect stereoscopic triplets,through a simultaneousactivation of HRG sensors in vertical mode,which will overcome the difficulty of terrain shadow in DEM *** the extremelyprecise ancillary metadata of SPOT 5 allows accurate geometric processing with sparse ground control *** SPOT 5 stereoscopicimagery becomes one of main satellite data sources for accurate DEM extraction and quickly mapping large *** current status and coverageof stereoscopic HRS imagery as well as the metadata of SPOT 5 will be briefly *** the second hand,about 2 million km^2 in west China never has been covered by 1:50000 scale topographic maps for several *** area contains the famous Qingzang plateau with average 5000m altitude and boundless Talimu basin *** this area withtraditional methods had unimaginable difficulties and was impossible to complete at *** the high technology advancing,especially thegreat progresses in geomatics,it is the time to start to map the area with new geo-information *** in 2006,China decided to initiatea large project,named 1:50000 scale topographic mapping of west China(*** China topographic mapping project),in order to getthe 1:50000 scale topographic maps(DEM,DOM and DLG)of that area within next 5 *** we know the weather is extremely atrociousand a lot of sites are out of reach in that area,mapping from aero-born and satellite remote sensing imagery with spares ground control pointswas determined to be the main so

关键词： mapping SPOT geometric modelling DEM accuracy