检索结果-南通市图书馆

Effect of template shape on metal nanoimprinting:a dislocation dynamics study

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 722-726页

作者： lucia NICOLA Department of materials Science and Engineering Delft University of Technology

Dislocation dynamics simulations are performed to investigate the effect of template shape on the nanoimprinting of metal layers. To this end, metal thin films are imprinted by a rigid template made of an array of equispaced indenters of various shapes, i.e., rectangular, wedge, and circular. The geometry of the indenters is chosen such that the contact area is approximately the same at the final imprinting depth. Results show that, for all template shapes, the final patterns strongly depend on the dislocation activity, and that each imprint differs from the neighboring ones. Large material pile ups appear between the imprints, such that polishing of the metal layer is suggested for application of the patterns in electronics. Rectangular indenters require the lowest imprinting force and achieve the deepest retained imprints.

关键词： Nanoimprinting Dislocation dynamics Simulations

PHYSICAL mODEL FOR THE ENGINEERING ANALYSISOF THE THERmOELASTICLTY OF SOLID BODIES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of mechanical Engineering 2000年第3期13卷 165-170,177页

作者： lucia Umberto I.N.F.m.-Istituto Nazionale per la Fisica della materia Nucl 意大利 Rivalta Sc I-15047

The thermal behaviour of the solids under elastic deformations is analysed in order to obtain a model which combines the molecular dynamics results with the global thermal behaviour of the solids under elastic transformations. The result obtained consists of the introduction of the thermal behaviour in the Parrinello-Rahman model, obtaining the thermal molecular dynamic model useful in the analysis of the thermoelastic behaviour of solids.

关键词： PHYSICAL mODEL FOR THE ENGINEERING ANALYSISOF THE THERmOELASTICLTY OF SOLID BODIES

Smart superabsorbent alginate/carboxymethyl chitosan composite hydrogel beads as efficient biosorbents for methylene blue dye removal

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2023年第28期159卷 81-90页

作者： Zhen Zhang Noureddine Abidi lucian lucia Department of Forest Biomaterials NC State UniversityRaleighNCUSA Fiber and Biopolymer Research Institute Department of Plant and Soil ScienceTexas Tech UniversityLubbockTXUSA Department of Chemistry NC State UniversityRaleighNCUSA

The presence of toxic dyes in the aqueous medium has threatened environmental safety, and thereby re- moving them from wastewater in an efficient way is highly desired. Herein, the efficient biosorbents were successfully fabricated via a facile physical gelation process of sodium alginate (SA) and carboxymethyl chitosan (CmCTS) in an acidic aqueous solution. The as-prepared hydrogel beads not only displayed water superabsorbent properties and pH-responsive swelling characters but also exhibited excellent methylene blue (mB) adsorption capacity removal efficiency with experimental maximum mB adsorption capacity of 2518 and 1005 mg g -1 , which are comparable with most reported lignocellulosic and alginate-based hydrogels. The mB adsorption process fitted well in different kinetic and isotherm models and became more heterogeneous in concentrated mB solutions as verified by principal component analysis results. The adsorption mechanism was proposed, and the high dye absorbency was attributed to the strong electro- static forces between adsorbents and adsorbates. Our current study provides a promising and sustainable composite hydrogels platform targeted to dye decontamination.

关键词： Hydrogel Dye adsorption Composites Superabsorbent Sodium alginate Carboxymethyl chitosan

minimal Free Resolutions of Zero-dimensional Schemes in P1 ×P1

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Algebra Colloquium 2015年第1期22卷 97-108页

作者： Paola Bonacini lucia marino Universita degli Studi di Catania ViMe A. Doria 6 95125 Catania Italy

Let X be a zero-dimensional scheme in p1 × p1. Then X has a minimal free resolution of length 2 if and only if X is ACm. In this paper we determine a class of reduced schemes whose resolutions, similarly to the ACm case, can be obtained by their Hilbert functions and depend only on their distributions of points in a grid of lines. moreover, a minimal set of generators of the ideal of these schemes is given by curves split into the union of lines.

关键词： resolution Hilbert function separators

Storytelling and environmental information: connecting schoolchildren and herpetofauna in morocco

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 2009年第2期4卷 188-195页

作者： lucia FANINI Soumia FAHD Department of Evolutionary Biology University of FlorenceItaly Laboratory for Diversity and Conservation of Biological Systems Department of BiologyFaculty of ScienceAbdelmalek Essâadi UniversityTétouanMorocco

Northwestern morocco is undergoing a sudden change in the level of infrastructure growth and pressure on the environment from increased *** ongoing changes are raising questions about how the ecosystem will react,and the relevant drivers of these *** Oued Laou valley in north-west morocco hosts high landscape,species and human cultural *** Talassemtane National Park has been established to preserve the envi-ronment in this region;however,what information tools are available to children regarding this environment?The ecosystem is illustrated here using three components:herpetofauna(representing ecosystem components),prob-lems related to water quantity and quality(representing interactions within ecosystem components)and Talassemtane National Park(representing a case of ecosystem management).A children’s book was written on this topic,and when the book was delivered to pupils,a questionnaire was included,aimed at determining their sources of environ-mental *** results identified major changes in the sources of information utilized by children in this part of morocco,a clear role of schools in explaining ecosystem components,and an increasing role of TV in environmental information *** role of the family was found to be less important than TV or *** major source of pupils’environmental knowledge is personal observation and hands-on experience,both for rural and urban *** are willing to discover and understand complex systems,and researchers should be encouraged to supply children with correct and up-to-date information on environmental systems,focusing at first on the local environment,as a background for sustainable development.

关键词： environmental education herpetofauna information sources moroccan Rif primary school.

Telomere shortening as genetic risk factor of liver cirrhosis

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 2015年第2期21卷 379-383页

作者： lucia Carulli Department of Biomedical Metabolic and Neural SciencesUniversity of Modena and Reggio Emilia41126 ModenaItaly

Cirrhosis is the main complication of chronic liver disease, leads to progressive liver function impairment and is the main risk factor for the development of liver cancer. Liver failure at endstage cirrhosis is associated with increased mortality with liver transplantation as the only possible treatment at this stage. The pathogenesis of liver cirrhosis is not completely elucidated. Although the common factors leading to liver injury, such as viral hepatitis, alcohol consume or fatty liver disease can be identified in the majority of patients a small percentage of patients have no apparent risk factors. moreover given the same risk factors, some patients progress to cirrhosis whereas others have a benign course, the reason remains unclear. In order to developnew diagnostic and therapeutic tools, it is s essential to understand the pathogenesis of cirrhosis. The identification of genetic risk factors associated with cirrhosis is one of the possible approach to achieve these goal. In the past years several studies have supported the role of telomere shortening and cirrhosis. In the recent year several studies on the relation between several single nucleotide polymorphism(SNPs) and cirrhosis have been published; it has been proposed also a cirrhosis risk score based on seven SNPs. Also epidemiological studies on identical twins and in different ethnic groups have been supporting the importance of the role of genetic risk factors. Finally in the very recent years it has been suggested that telomere shortening may represent a genetic risk factor for the development of cirrhosis.

关键词： Liver cirrhosis Genes Single nucleotide polymorphi

Performance of a base isolator with shape memory alloy bars

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2007年第4期6卷 401-408页

作者： Fabio Casciati lucia Faravelli Karim Hamdaoui Dept. of Structural mechanics University of Pavia Pavia Italy

A new and innovative base isolation device is introduced in this paper based on extensive research carried out by the authors and their co-workers. A prototype of the device was built and experimentally tested on the shaking table. The new base isolation device consists of two disks, one vertical cylinder with an upper enlargement sustained by three horizontal cantilevers, and at least three inclined shape memory alloy （SmA） bars. The role of the SmA bars is to limit the relative motion between the base and the superstructure, to dissipate energy by their super-elastic constitutive law and to guarantee the re-centring of the device. To verify the expected performance, a prototype was built and tested under sinusoidal waves of displacement of increasing frequency with different amplitudes. It is shown that the main feature of the proposed base isolation device is that for cyclic loading, the super-elastic behavior of the alloy results in wide load-displacement loops, where a large amount of energy is dissipated.

关键词： base isolator dynamic excitation energy dissipation shape memory alloy shaking table test

Non-operative successful management of a perforated small bowel diverticulum

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第48期20卷 18477-18479页

作者： melissa m Levack maria lucia madariaga Haytham mA Kaafarani Division of Trauma Department of Surgery SurgicalCritical Care Massachusetts General Hospital Harvard MedicalSchool Boston MA 02114 United States

Jejunoileal diverticula are rare and generally asymptomatic. In the few cases of patients who develop complications such as diverticulitis, perforation, obstruction, and/or hemorrhage, conventional treatment consists of surgical resection. We describe a case of perforated jejunoileal diverticulum with localized abscess and highlight the merits of surgical vs medical management. The patient is a 77-year-old male who presented with sharp, constant abdominal pain just inferior to the umbilicus. Administration of intravenous antibiotics results in complete and long-term resolution of the patient’s symptoms. In this report, we establish a framework for safely treating perforated small bowel diverticulum without surgical exploration.

关键词： Jejunal diverticula Diverticulitis Small bowel perforation Antibiotics Abscess

Incipient sliding of adhesive contacts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Friction 2022年第6期10卷 963-976页

作者： Francesc PÉREZ-RÀFOLS lucia NICOLA Department of Industrial Engineering University of PadovaPadua I-35131Italy Department of material Science and Engineering Delft University of TechnologyDelft 2628 CN the Netherlands

A model is proposed herein to investigate the incipient sliding of contacts in the presence of both friction and adhesion,where the interfacial response is modeled based on traction-separation laws.A maugis-like parameter is defined to characterize the response in the tangential ***,the model is used to investigate the contact between a smooth cylinder and a flat body,where adhesion-friction interactions are strong.A range of behaviors are observed when a tangential displacement is imposed:When the parameter is low,the contact pressure exhibits a relatively constant profile;when it is high,a pressure spike is observed at the edge of the *** difference is caused by a significant interface compliance in the former case,which limits the amount of *** results for the mid-range values of the maugis-like parameter can qualitatively replicate various experiments performed using polydimethylsiloxane(PDmS)balls.

关键词： incipient sliding adhesion traction-separation laws