检索结果-南通市图书馆

Journal of Environmental Sciences 2019年第2期31卷 403-414页

作者： Cesar nieto-Delgado Joel Gutiérrez-Martínez J.Rene Rangel-Méndez Environmental Sciences Division Potosino Institute of Scientific and Technological ResearchIPICyT

The arsenic removal efficiency of iron-modified activated carbons depends greatly on the number of available iron oxide surface sites, which are given by the surface area of the anchored particles. In this sense, aiming the generation of an adsorbent with superior arsenic adsorption capacity, we developed a protocol to anchor interconnected fibrils of iron oxyhydroxides, using Mn^(2+) as a morphology regulator. The protocol was based on a microwave-assisted hydrothermal method, using bituminous based activated carbon and both Fe^(2+) and Mn^(2+) ions in the hydrolysis solution. The elemental analysis of modified carbons revealed that Mn does not anchor to the carbon. However, when Mn is included in the hydrolysis solution, the iron content in the activated carbon increased up to 3.5 wt%,without considerable decreasing the adsorbent surface area. Under specific hydrothermal conditions, the Mn^(2+) promoted the formation of iron oxide nanoparticles shaped as interconnected fibrils. This material showed a superior arsenic adsorption capacity in comparison to similar iron modified activated carbons(5 mg As/g carbon, at 2 mg As/L),attributed to the increase in quantity and availability of active sites located on the novel interconnected fibrils of iron oxyhydroxides nanostructures.

关键词： Iron oxide nanostructures Hydrothermal synthesis Microwave Adsorption capacity Kinetics

Improved shape hardening function for bounding surface model for cohesive soils

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2014年第4期6卷 328-337页

作者： Andrés nieto-Leal Victor N.Kaliakin Department of Civil & Environmental Engineering University of Delaware Newark DE 19716 USA Department of Civil Engineering Universidad Militar Nueva Granada Bogotá Colombia

A shape hardening function is developed that improves the predictive capabilities of the generalized bounding surface model for cohesive soils, especially when applied to overconsolidated specimens. This improvement is realized without any changes to the simple elliptical shape of the bounding surface, and actually reduces the number of parameters associated with the model by one.

关键词： Constitutive model Bounding surface plasticity Shape hardening function Clay

Shallow water equations for power law and Bingham fluids Dedicated to the NSFC-CNRS Chinese-French summer institute on fluid mechanics in 2010

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2012年第2期55卷 277-283页

作者： FERNANDEZ-nieto Enrique D. NOBLE Pascal VILA Jean-Paul Departamento de Matemdtica Aplicada I Universidad de Sevilla 41012 Sevilla Spain Universite de Lyon Universitd Lyon1 Institut Camille Jordan UMR CNRS 520843 blvd du 11 novembre 1918 F-69622 ViUeurbanne Cedex France Institut de Mathdmatiques de Toulouse UMR CNRS 5219 INSA de Toulouse 135 avenue de Rangueil 31077 Toulouse Cedex 4 France

In this note, we provide a consistant thin layer theory for power law and Bingham incompressible fluids flowing down an inclined plane under the effect of gravity. The derivation of such equations is based on formal asymptotic expansions of solutions of Cauchy momentum equations in the shallow water scaling and in the neighbourhood of steady solutions so that we can close the average equations on the fluid height h and the total discharge rate q.

关键词： shallow water equations asymptotic analysis non-Newtonian fluids

Heterogeneous catalysis under flow for the 21st century fine chemical industry

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2021年第2期6卷 161-166页

作者： Rosaria Ciriminna mario Pagliaro Rafael Luque Istituto per Io Studio dei Mate riali Nanostnuturati CNRwia U.La Malfa 15390146PulemoItaly Deparamento de Quimica Orginica Univeridad de CordobaCampus de RabonalesEdificio Marie Curie(C-3)Cra Nnal IV-Akm 396Cordoba14014Spain Peoples Friendship University of Russia(RUDN Universiy) 6 Miklukho Maklaya St117198MoscowRussia

Due to metal leaching and poor catalyst stability, the chemical industry's fine chemical and pharmaceutical sectors have been historically reluctant to use supported transition metal catalysts to manufacture fine chemicals and active pharmaceutical ingredients. With the advent of new generation supported metal catalysts and flow chemistry, we argue in this study, this situation is poised to quickly change. Alongside heterogenized metal nanoparticles, both single-site molecular and single-atom catalyst will become ubiquitous. This study offers a critical outlook taking into account both technical and economic aspects.

关键词： Fine chemical Heterogeneous catalysis Single atom catalysis Green chemistry Chemical industry

Both comorbidity burden and low testosterone can explain symptoms and signs of testosterone deficiency in men consulting for sexual dysfunction

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2020年第3期22卷 265-273页

作者： Giulia Rastrelli Giovanni Corona mario Maggi Sexual Medicine and Andrology Unit Department of Experimental and Clinical Biomedical SciencesUniversity of FlorenceViale Pieraccini 6Florence 50139Italy Endocrinology Unit Medical DepartmentMaggiore-Bellaria HospitalLargo Nigrisoli 2Bologna 40133Italy I.N.B.B. Biostructures and Biosystems National InstituteViale delle Medaglie d'Oro 305Rome(X)136Italy Endocrinology Unit Department of Experimental Clinical and Biomedical Sciences**Mario Serio"University of FlorenceViale Pieraccini 6Florence 50139Italy.

Low testosterone(T)is frequent in men with chronic *** clinical features of T deficiency(TD)overlap with those of chronic *** aim of this study is to evaluate the relative contribution of chronic disease score(CDS)and low T to the presenee of TD symptoms.A consecutive series of 3862 men(aged 52.1±13.1 years)consulting for sexual dysfunction were *** clinical and biochemical parameters were collected,in eluding the structured interview,ANDROTEST,for the assessme nt of TD *** color Doppler ultrasound(PCDU)was also *** on the medications taken,the CDS was *** a subset of 1687 men,information on mortality was collected(follow-up of 4.3±2.6 years).Higher CDS was associated with lower free and total T(TT)as well as with higher ANDROTEST *** introducing CDS and TT in multivariable models adjusted for age,severe erectile dysfunctio n and impaired morning erectio ns were associated with both CDS(odds ratio and 95%confide nee interaval,OR[95%Cl]=1.25[1.13;1.37]and 1.38[1.29;1.48],respectively)and low TT(OR[95%Cl]=1.11[1.00;1.23]and 1.13[1.06;1.21],respectively).Similar results were obtained for PCDU *** sexual desire was associated with low TT(OR[95%Cl]=1.21[1.13;1.30]),whereas it was inversely related with CDS(OR[95%Cl]=0.91[0.84;0.97]).When considering mortality for major cardiovascular events,TT<8 nmol I1,but not CDS,was a significant predictor(hazard ratio[95%Cl]=5.57[1.51;20.63]).Chronic illnesses are associated with an overt *** chronic diseases and low T can be invoIved in determining symptoms present in subjects complaining for sexual *** should be considered in the diagnostic workup for TD.

关键词： chronic diseases erectile dysfunction sexual symptoms testosterone deficiency

Hydrogels for neuroprotection and functional rewiring: a new era for brain engineering

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

Neural Regeneration Research 2020年第5期15卷 783-789页

作者： Rocío Fernández-Serra Rebeca Gallego Paloma Lozano Daniel González-nieto Center for Biomedical Technology Universidad Politécnica de Madrid. MadridSpain Departamento de Tecnología Fotónica y Bioingeniería ETSI TelecomunicacionesUniversidad Politécnica de MadridMadridSpain Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine (CIBER-BBN) MadridSpain

The neurological devastation of neurodegenerative and cerebrovascular diseases reinforces our perseverance to find advanced treatments to deal with these fatal ***-performance preclinical results have failed at clinical level,as it has been the case for a wide variety of neuroprotective agents and cell-based therapies employed to treat high prevalent brain pathologies such as stroke,Alzheimer’s and Parkinson’s *** unquestionable reality is the current absence of effective therapies to neuroprotect the brain,to arrest neurodegeneration and rewire the impaired brain *** of the problem might arise from the lack of adequate in vitro and in vivo models and that most of the underlying pathophysiological mechanisms are not yet *** contributing factor is the lack of efficient systems to sustain drug release at therapeutic concentrations and enhance the survival and function of grafted cells in transplantation *** medical applications the use of biomaterials of different compositions and formats has experienced a boom in the last *** the greater complexity of central nervous system has probably conditioned their extensive use with respect to other organs,the number of biomaterials-based applications to treat the injured brain or in the process of being damaged has grown ***-based biomaterials have constituted a turning point in the treatment of cerebral disorders using a new form of advanced *** show mechanical properties in the range of cerebral tissue resulting very suitable for local implantation of drugs and *** is also possible to fabricate three-dimensional hydrogel constructs with adaptable mesh size to facilitate axonal guidance and *** this article,we review the current trends in this area highlighting the positive impact of hydrogel-based biomaterials over the exhaustive control of drug delivery,cell engraftment and axonal reinnervation in brain p

关键词： advanced therapies Alzheimer’s disease biomaterials brain hydrogels neurological diseases Parkinson’s disease polymers stroke

Mathematical analysis of Hepatitis C Virus infection model in the framework of non-local and non-singular kernel fractionalderivative

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2023年第1期16卷 77-96页

作者： Ibrahim Slimane Ghazala Nazir Juan J.nieto Faheem Yaqoob Faculty of Eaact Sciences and Informatics UMABAbdelhamid IbnBadis P.O.Bor 227 University of Mostaganem 27000Mostaganem Algeria Department of Mathematics Universityof Malakand KhyberPakhtunkhawa Pakistan ghazalanazir732@*** Department of Statistics Mathematical Analysis and Optimization Galician Center for Mathematical Research and Technology University of Santiago de Compostela 15782 Santiago de Compostela Spain Department of Computer Sciences and Information Technology University of Poonch Rawalakot Azad Kashmir Pakistan

In this paper,we study a mathematical model of Hepatitis C Virus(HCV)*** present a compartmental mathematical model involving healthy hepatocytes,infected hepatocytes,non-activated dendritic cells,activated dendritic cells and cytotoxic T *** derivative used is of non-local fractional order and with non-singular *** existence and uniqueness of the system is proven and its stability is ***,by applying the Laplace Adomian decomposition method for the fractional derivative,we present the semi-analytical solution of the ***,some numerical simulations are performed for concrete values of the parameters and several graphs are plotted to reveal the qualitative properties of the solutions.

关键词： Hepatitis C virus(HCV) infection dendritic cells(DC) cytotoxic T lymphocytes(CTL) Atangana-Baleanu(AB) Laplace Adomians decomposition method(LADM).

Permanence and global attractivity of stage-structured predator-prey model with continuous harvesting on predator and impulsive stocking on prey

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

Applied Mathematics and Mechanics(English Edition) 2008年第5期29卷 653-663页

作者：焦建军陈兰荪 Juan J.nieto Torres Angela School of Mathematics and Statistics Guizhou College of Finance and Economics Department of Applied Mathematics Dalian University of Technology Department of Mathematical Analysis Faculty of MathematicsUniversity of Santiago de Compostela15782 Santiago de Compostela Spain Department of Psychiatry Radiology and Public Health Faculty of Medicine University of Santiago de CompostelaSpain

We investigate a stage-structured delayed predator-prey model with impulsive stocking on prey and continuous harvesting on predator. According to the fact of biological resource management, we improve the assumption of a predator-prey model with stage structure for predator population that each individual predator has the same ability to capture prey. It is assumed that the immature and mature individuals of the predator population are divided by a fixed age, and immature predator population does not have the ability to attach prey. Sufficient conditions are obtained, which guarantee the global attractivity of predator-extinction periodic solution and the permanence of the system. Our results show that the behavior of impulsive stocking on prey plays an important role for the permanence of the system, and provide tactical basis for the biological resource management. Numerical analysis is presented to illuminate the dynamics of the system.

关键词： stage-structured, impulsive stocking continuous harvesting global attractivity permanence

Fast Solvers of Fredholm Optimal Control Problems

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2010年第4期3卷 431-448页

作者： mario Annunziato Alfio Borzi Universita degli Studi di Salerno Dipartimento di Matematica e InformaticaVia Ponte Don Melillo84084 Fisciano(SA)Italia Universita degli Studi del Sannio Dipartimento e Facolta di IngegneriaPalazzo Dell'Aquila Bosco LucarelliCorso Garibaldi 10782100 BeneventoItalia Institutfr Mathematik und Wissenschaftliches Rechnen Karl-Franzens-Universitt GrazHeinrichstr.368010 GrazAustria.

The formulation of optimal control problems governed by Fredholm integral equations of second kind and an efficient computational framework for solving these control problems is presented. Existence and uniqueness of optimal solutions is proved.A collective Gauss-Seidel scheme and a multigrid scheme are discussed. Optimal computational performance of these iterative schemes is proved by local Fourier analysis and demonstrated by results of numerical experiments.

关键词： Optimal control theory Fredholm integral equations of second kind iterative methods

Proper progression of neurogenesis relies on a defined pattern of SUMO-modified proteins

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第8期17卷 1731-1732页

作者： mario García-Domínguez Andalusian Centre for Molecular Biology and Regenerative Medicine-CABIMER CSIC-Universidad de Sevilla-Universidad Pablo de Olavide SevilleSpain

Neurogenesis is a complex process involving the orchestration of many transcription factors and other *** regulation of their activities is crucial for proper progression of neurogenesis.A few decades ago,covalent attachment of Small Ubiquitin-like MOdifier(SUMO)to other proteins was revealed as a major regulator of protein activities,constituting an essential posttranslational modification system in *** then,hundreds of proteins have been shown to be targets of SUMO,which is implicated in controlling many relevant processes in eukaryotic *** include the development and function of the nervous system,with SUMO tightly linked to synapsis and to neurodegenerative diseases(Yau et al.,2020).The SUMO protease SENP7 has been involved in neurogenesis(Juárez-Vicente et al.,2016),while sumoylation of BRAF35,a subunit of the LSD1 histone demethylase complex,assures the undifferentiated state of neural progenitors(Ceballos-Chávez et al.,2012).In addition,increased sumoylation in mouse brain-derived neural stem cells results in enhanced neuronal differentiation(Bernstock et al.,2019).

关键词： pattern diseases