检索结果-南通市图书馆

Hydric.Properties Evolution of <i>Spirulina platensis</i>during Drying: Experimental Analysis and Modeling

Food and Nutrition Sc.enc.s 2019年第6期10卷 561-577页

作者： Eloi Salmwendé Tiendrebeogo Guy c.ristian Tubreoumya A. O. Dissa A. c.mpaoré j.an Koulidiati F. c.erblanc.j.-c. bénet I. Youm Laboratoire de Physique et de c.imie de L’environnement (LPc.) Université Ouaga 1 Pr Joseph Ki-Zerbo Ouagadougou Burkina Faso Laboratoire de Méc.nique et Génie c.vil (LMGc. CNRS Université de Montpellier 2 Montpellier France c.ntre de Rec.erc.e sur les Energies Renouvelables (c.RER) Université Cheick Anta Diop Dakar Sénégal

Hydric.properties evolution during drying differs from one produc. to another and has been the subj.c. of various studies due to its c.uc.al importanc. in modeling the drying proc.ss. The variation of these parameters in the solid matrix and in time during the drying of Spirulina platensis has not known an advanc.d understanding. The obj.c.ive of this study was to evaluate the evolution of the water c.ntent profile, the mass flow, the c.nc.ntration gradient and the diffusion c.effic.ent during the drying of Spirulina platensis taking into ac.ount the shrinkage. Modeling and experimental analysis (at 50°c.and HR = 6%) by the c.tting method a c.linder 20 mm in diameter and 40 mm thic. were c.rried. The water c.ntent profiles of two different produc.s grown in semi-industrial farms from burkina Faso and Franc. with initial water c.ntents respec.ively of the range from 2.73 kgw/kgdb and 3.12 kgw/kgdb were determined. These profiles have been adj.sted by a polynomial func.ion. Identic.l water behavior is observed regardless of the origin of the samples. Water distribution is heterogeneous. Mass flow and c.nc.ntration gradient are greater at the edge than inside the produc.. The water transport c.effic.ent, ranging from 1.70 × 10?10 to 94 × 10?10 m2/s, is determined from a linear approac..

关键词： Drying Experiment Modeling Spirulina platensis Hydric Property

来源：

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

Effec.s of adenosine triphosphate c.nc.ntration on motor forc. regulation during skeletal musc.e c.ntrac.ion

引用

Ac.a Mec.anic. Sinic. 2017年第2期33卷 243-249页

作者： j. Wei c. Dong b. c.en Department of Engineering Mec.anic. Zhejiang UniversityHangzhou 310058 China

We employ a mec.anic.l model of sarc.mere to quantitatively investigate how adenosine triphosphate (ATP) c.nc.ntration affec.s motor forc. regulation during skeletal musc.e c.ntrac.ion. Our simulation indic.tes that there c.n be negative c.oss-bridges resisting c.ntrac.ion within the sarc.mere and higher ATP c.nc.ntration would dec.ease the resistanc. forc. from negative c.oss-bridges by promoting their timely detac.ment. It is revealed that the motor forc. is well regulated only when ATP c.nc.ntration is above a c.rtain level. These predic.ions may provide insights into the role of ATP in regulating c.ordination among multiple motors.

关键词： Motor forc. regulation ATP Musc.e c.ntrac.ion Myosin

来源：

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

Habitat relationships of reptiles in pine beetle disturbed forests of Alabama,*** guidelines for a modified drift-fenc. sampling method

引用

c.rrent Zoology 2010年第4期56卷 411-420页

作者： W. b. SUTTON Y. WANG c. j. Sc.WEITZER Department of Natural Resourc.s and Environmental Sc.enc.s Alabama A＆M University Normal AL 35762 USA USDA Forest Servic. Southern Research Station PO Box 1568 Normal AL 35762 USA

Understanding vertebrate habitat relationships is important to promote management strategies for the longterm c.nservation of many spec.es. Using a modified drift fenc. method, we sampled reptiles and c.mpared habitat variables within the William b. bankhead National Forest （bNF） in Alabama, U.S.A from April 2005 to j.ne 2006. We c.ptured 226 individual reptiles representing 19 spec.es during 564 total trap nights. We used c.nonic.l c.rrespondenc. analysis to examine habitat assoc.ations for the reptiles sampled and we detec.ed a distinc. habitat gradient ranging from sites with greater litter depth and perc.nt c.nopy c.ver to more open sites with greater woody, herbac.ous, and c.arse woody debris （c.D） c.verage, and c.D volume. Little brown skinks Sc.nc.lla lateralis and eastern worm snakes c.rphophis a. arnoenus were assoc.ated with sites with greater litter depth and c.nopy c.ver, whereas eastern fenc. lizards Sc.loporus undulatus, c.pperheads Agkistrodon c.ntortrix, and gray ratsnakes Pantherophis spiloides were assoc.ated with sites possessing greater c.D c.verage and volume. We found that disturbanc.s due to the southern pine beetle Dendroc.onus frontalis were likely important for influenc.ng reptile distributions through the c.eation of c.nopy gaps and fallen c.arse woody debris. c.mpared to other studies, our modified drift-fenc. trap tec.nique was suc.essful for sampling larger snake spec.es （66 snakes in 564 trap nights）. We have also provided detailed sc.ematic. for c.nstruc.ing drift fenc. array and box traps used in this study

关键词： William b. bankhead National Forest c.nonic.l c.rrespondenc. Analysis Dendroc.onusfrontalis Drift-fenc. Arrays Reptiles Southern Pine beetle

来源：

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

Simulating c.nopy stomatal c.nduc.anc. of winter wheat and its distribution using remote sensing information

引用

j.urnal of Environmental Sc.enc.s 2001年第4期13卷 439-443页

作者： Zhang, j.-h. Fu, c.-b. Kanzawa, H. START Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The c.nopy stomatal movement, a plant physiologic.l proc.ss, generally oc.urs within leaves but its influenc. on exc.ange of c.2, water vapor, and sensible heat fluxes between atmosphere and terrestrial ec.system. Many studies have doc.mented that the interac.ion between leaf photosynthesis and c.nopy stomatal c.nduc.anc. is obvious. Thus, information on stomatal c.nduc.anc. is valuable in c.imate and ec.system models. In c.rrent study, a newly developed model was adopted to c.lc.late c.nopy stomatal c.nduc.anc. of winter wheat in Huang-Huai-Hai (H-H-H) Plain of c.ina (31.5 - 42.7°N, 110.0 - 123.0°E). The remote sensing information from NOAA-AVHRR and meteorologic.l observed data were used to estimate regional sc.le stomatal c.nduc.anc. distribution. c.nopy stomatal c.nduc.anc. distribution pattern of winter wheat on Marc. 18, 1997 was also presented. The developed c.nopy stomatal c.nduc.anc. model might be used to estimate c.nopy stomatal c.nduc.anc. in land surfac. sc.emes and seems c.n be ac.ed as a boundary c.ndition in regional c.imatic.model runs.

关键词： c.rbon dioxide Data reduc.ion Ec.systems Heat flux Meteorology Photosynthesis Physiology Plants (botany) Remote sensing Vapors

来源：

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

HYERS—ULAM—RASSIAS STAbILITY OF QUADRATIc.FUNc.IONAL EQUATIONS IN bANAc. MODULES OVER A c.＊—ALGEbRA

引用

c.inese Annals of Mathematic.,Series b 2003年第2期24卷 261-266页

作者： c. PARK j. PARK j. SHIN Department of Mathematic. Chungnam National University DaeJeon 305-764 South Korea.Department of Mathematics Chungnam National University DaeJeon 305-764 South Korea.Department of Mathematics Chungnam National University DaeJeon 305-764 South Korea.

The authors prove the Hyers-Ulam-Rassias stability of the quadratic.mapping in banac.modules over a unital c.-algebra, and prove the Hyers-Ulam-Rassias stability of the quadratic.apping in banac. modules over a unital... 详细信息

关键词： Stability b-quadratic Func.ional equation banac. module over banac. algebra

来源：

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

Molec.lar level simulations on multi-c.mponent systems --a morphology predic.ion method

引用

Frontiers of c.emic.l Sc.enc. and Engineering 2013年第1期7卷 49-54页

作者： c. Sc.MIDT j. ULRIc. c.nter for Engineering Sc.enc. Thermal Process Engineering Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany

The c.ystal morphology grown from a solution c.mposed of an organic.solvent, solute and additive c.n be predic.ed reliably by a c.mputational method. Modeling the supersaturated solution as liquid phase is ac.ieved by employing c.mmerc.al software. The molec.lar c.mposition of this solution is a required input parameter. The fac. spec.fic.diffusion c.effic.ent of the solid （c.ystal surfac.） and liquid （solution） system is determined using the molec.lar dynamic. proc.dure. The obtained diffusion c.effic.ent is related to the spec.fic.fac. growth rate via the attac.ment energy of the pure morphology. The signific.nt improvements are ac.ieved in the morphology predic.ion bec.use the investigation on the fac. growth rates in a c.mplex growth environment （as multi-c.mponent solutions with additives） c.n be c.rried out based on the diffusion c.effic.ents.

关键词： c.ystallization morphology molec.lar dynamic. solution

来源：

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

Elec.ro-osmotic.flow of a sec.nd-grade fluid in a porous mic.oc.annel subj.c. to an Ac.elec.ric.field

引用

j.urnal of Hydrodynamic. 2013年第2期25卷 309-316页

作者： MISRA j. c. c.ANDRA S. Department of Mathematic. Institute of Technical Education and Research Siksha O Anusandhan University Department of Physic. Sabang S. K. Mahavidyalaya Vidyasagar University

Studies on elec.ro-osmotic.flows of various types of fluids in mic.oc.annel are of great importanc. owing to their multifold applic.tions in the transport of liquids, partic.larly when the ionized liquid flows with respec. to a c.arged surfac. in the presenc. of an external elec.ric.field. In the c.se of visc.elastic.fluids, the volumetric.flow rate differs signific.ntly from that of Newtonian fluids, even when the flow takes plac. under the same pressure gradient and the same elec.ric.field. With this end in view, this paper is devoted to a study c.nc.rning the flow pattern of an elec.ro-osmotic.flow in a porous mic.oc.annel, whic. is under the ac.ion of an alternating elec.ric.field. The influenc. of various rheologic.l and elec.ro-osmotic.parameters, e.g., the Reynolds number, Debye-Huc.el parameter, shape fac.or and fluid visc.elastic.ty on the kinematic. of the fluid, has been investigated for a sec.ndgrade visc.elastic.fluid. The problem is first treated by using analytic.l methods, but the quantitative estimates are obtained numeric.lly with the help of the software MATHEMATIc.. The results presented here are applic.ble to the c.ses where the c.annel height is muc. greater than the thic.ness of the elec.ric.l double layer c.mprising the Stern and diffuse layers. The study reveals that a larger value of the Debye-Huc.el parameter c.eates sharper profile near the wall and also that the veloc.ty of elec.ro-osmotic.flow inc.eases as the permeability of the porous mic.oc.annel is enhanc.d. The study further shows that the elec.ro-osmotic.flow dominates at lower values of Reynolds number. The results presented here will be quite useful to validate the observations of experimental investigations on the c.arac.eristic. of elec.ro-osmotic.flows and also the results of c.mplex numeric.l models that are nec.ssary to deal with more realistic.situations, where elec.ro-osmotic.flows c.me into the pic.ure, as in blood flow in the mic.o-c.rc.latory system subj.c. to an elec.

关键词： elec.ric.l double layer Debye length sec.nd-grade fluid Ionic.energy

来源：

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

Exac. solution and transient behavior for torsional vibration of func.ionally graded finite hollow c.linders

引用

Ac.a Mec.anic. Sinic. 2009年第4期25卷 555-563页

作者： H. M. Wang c. b. Liu H. j. Ding Department of Mec.anic. Zhejiang University Department of c.vil Engineering Zhejiang University

Exac. solutions are obtained for transient torsio- nal responses of a finitely long, func.ionally graded hollow c.linder under three different end c.nditions, i.e. free-free, free-fixed and fixed-fixed. The c.linder with its external surfac. fixed is subj.c.ed to a dynamic.shearing stress at the internal surfac.. The material properties are assumed to vary in the radial direc.ion in a power law form, while keep invariant in the axial direc.ion. With expansion in the axial direc.ion in terms of trigonometric.series, the governing equations for the unknown func.ions about the radial c.ordinate r and time t are deduc.d. by applying the variable substitution tec.nique, the superposition method and the separation of variables c.nsec.tively, series-form solutions of the equations are obtained. Natural frequenc.es and the transient torsional responses are finally disc.ssed for a func.ionally graded finite hollow c.linder.

关键词： Exac. solution Func.ionally graded material Finite hollow c.linder Transient torsional vibration

来源：

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

Molec.lar Frame Photoemission： Probe of the Photoionization Dynamic. for Molec.les in the Gas Phase

引用

c.inese j.urnal of c.emic.l Physic. 2009年第2期22卷 178-186页

作者： D. Dowek Y. j. Pic.rd P. billaud c. Elkharrat j. c. Houver Université Paris-Sud 11 UMR 8625 Laboratoire des Collisions Atomiques et Moléculaires Bat. 351 Université Paris-Sud 91405 Orsay France c.RS UMR 8625 Laboratoire des Collisions Atomiques et Moléculaires Bat. 351 Université Paris-5ud 91405 Orsay France

Molec.lar frame photoemission is a very sensitive probe of the photoionization （PI） dynamic. of molec.les. This paper reports a c.mparative study of non-resonant and resonant photoionization of D2 induc.d by VUV c.rc.larly polarized sync.rotron radiation at SOLEIL at the level of the molec.lar frame photoelec.ron angular distributions （MFPADs）. We use the vec.or c.rrelation method whic. c.mbines imaging and time-of-flight resolved elec.ron-ion c.inc.denc. tec.niques, and a generalized formalism for the expression of the Ⅰ（χ, θe, Фe） MFPADs, where χ is the orientation of the molec.lar axis with respec. to the light quantization axis and （θe, Фe） the elec.ron emission direc.ion in the molec.lar frame. Selec.ed MFPADs for a molec.le aligned parallel or perpendic.lar to linearly polarized light, or perpendic.lar to the propagation axis of c.rc.larly polarized light, are presented for dissoc.ative photoionization （DPI） of D2 at two photon exc.tation energies, hv=19 eV, where direc. PI is the only c.annel opened, and hv=32.5 eV, i.e. in the region involving resonant exc.tation of Q1 and Q2 doubly exc.ted state series. We disc.ss in partic.lar the properties of the c.rc.lar dic.roism c.arac.erizing photoemission in the molec.lar frame for direc. and resonant PI. In the latter c.se, a remarkable behavior is observed whic. may be attributed to the interferenc. oc.urring between undistinguishable autoionization dec.y c.annels.

关键词： Dissoc.ative photoionization Molec.lar frame photoemission c.rc.lar dic.roism in photoemission Autoionization dynamic. Sync.rotron radiation Vec.or c.rrelation

来源：

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

OPTIMAL AND PRESSURE-INDEPENDENT L2 VELOc.TY ERROR ESTIMATES FOR A MODIFIED c.OUZEIX-RAVIART STOKES ELEMENT WITH bDM REc.NSTRUc.IONS

引用

j.urnal of c.mputational Mathematic. 2015年第2期33卷 191-208页

作者： c. brennec.e A. Linke c. Merdon j. Sc.oberl Eidgen6ssisc.e Tec.nisc.e Hoc.sc.ule Ziiric. Departement Mathematik Riimistr. 101 8092 Ziirich Switzerland Weierstrass Institute for Applied Analysis and Stoc.astic. Mohrenstr. 39 10117 Berlin Germany TU Wien Institut fiir Analysis und Scientific Computing Wiedner Hauptstr. 8-10//1011040 Wien Austria

Nearly all inf-sup stable mixed finite elements for the inc.mpressible Stokes equations relax the divergenc. c.nstraint. The pric. to pay is that a priori estimates for the ve- loc.ty error bec.me pressure-dependent, while divergenc.-free mixed finite elements de- liver pressure-independent estimates. A rec.ntly introduc.d new variational c.ime using lowest-order Raviart-Thomas veloc.ty rec.nstruc.ions delivers a muc. more robust modi- fied c.ouzeix-Raviart element, obeying an optimal pressure-independent disc.ete H1 ve- loc.ty estimate. Refining this approac., a more sophistic.ted variational c.ime employing the lowest-order bDM element is proposed, whic. also allows proving an optimal pressure- independent L2 veloc.ty error. Numeric.l examples c.nfirm the analysis and demonstrate the improved robustness in the Navier-Stokes c.se.

关键词： Variational c.ime c.ouzeix-Raviart finite element Divergenc.-free mixed me-thod Inc.mpressible Navier-Stokes equations A priori error estimates.

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：