检索结果-南通市图书馆

Positron Affinity, Deformation Potential and Diffusion Constant in AlxIn1-xSb Ternary Semiconductor Alloys

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

Acta Metallurgica Sinica(English Letters) 2016年第7期29卷 661-667页

作者： Nour EI-Houda Fares nadir Bouarissa Materials and Electronic Systems Laboratory University of Bordj-Bou-Arr6ridj 34000 Bordj-Bou-Arr6ridj Algeria Laboratory of Materials Physics and Its Applications University of M'sila 28000 M'sila Algeria 9 Rue K Fg des martyrs 34000 Bordj-Bou-Arreridj Algeria

The present investigation deals with the positron behaviour in Alxlnl_xSb ternary semiconductor alloys in the zinc-blende phase. The calculations are mainly based on a pseudopotential approach coupled with the independent particle model. Features such as elastic constants, electron and positron chemical potentials, positron deformation potential and positron diffusion constant are determined. Moreover, the positron affinity to InSb, A1Sb and their related ternary alloys and heterostructures is calculated. The present results are compared to experiment and found to be in reasonably good agreement. The information gathered from the present study can help in understanding the positron trapping at interfaces and precipitates and might be useful in slow-positron-beam experiments.

关键词： Semiconductor alloys Positrons Diffusion Surface and interface states Heterostructures

Effect of Wood-drying Condensate on Emission of Volatile Organic Compounds and Bonding Properties of Fibreboard

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

Journal of Bionic Engineering 2020年第1期17卷 206-214页

作者： nadir Ayrilmis Tolga Kapti Ali Gürel Martin Ohlmeyer Department of Wood Mechanics and Technology Forest FacultyIstanbul University-CerrahpasaIstanbul 34473Turkey Polisan Kimya San.A.(S). Dilovas(i)Organize Sanayi B(o)lgesi 1.K(i)s(i)m Liman Cad.No:7Dilovas(i)41455Turkey Forest Research Institute Marmara RegionGeneral Directorate of Forestry of TurkeyIstanbul 34398Turkey Thünen-Institut für Holzforschung Thünen Institute of Wood ResearchLeuschnerstr.91 cHamburg 21031Germany

Potential use of condensate generated by cooling the steam obtained during high-frequency/vacuum drying step of hardwood lumber was *** liquid condensates were obtained from oak,beech and walnut *** liquid condensate was then used as a replacement for deionized water in the synthesis of Urea-Formaldehyde(UF)resin(5 wt%of total resin)using a laboratory scale *** Density Fibreboards(MDFs)were produced using control and modified *** of Volatile Organic Compounds(VOCs)from the MDFs were determined by Micro Chamber *** bonding properties of the MDFs were determined according to European *** main VOC emissions from MDFs produced using UF resin containing the condensate were a-Pinene,b-Pinene,careen,and acetic acid,which were lower than those of the control MDF,except for the acetic acid emission of MDF with oak *** the tree species,the beech wood condensate gave the lowest VOC emissions(732μg·m^-3)from the MDFs,followed by the MDFs containing walnut wood condensate(852μg·m^-3),oak wood condensate(998μg·m^-3),and control MDF(3529μg·m^-3),***,the internal bond strength of MDFs containing the condensate was negatively impacted by the condensate(0.70 N·mm^-2 to 0.54 N·mm^-2 depending on the tree species).The results showed that the liquid wood-drying condensate which generally released to the ground could be efficiently used as an alternative to expensive VOCs scavenger used in the production of UF resin bonded *** may be one of the most efficient uses of the condensate in high value-added materials.

关键词： bionics condensate fibreboard urea-formaldehyde VOCs

Lump and travelling wave solutions of a(3+1)-dimensional nonlinear evolution 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

Journal of Ocean Engineering and Science 2024年第2期9卷 164-172页

作者： Kalim U.Tariq Raja nadir Tufail Department of Mathematics Mirpur University of Science and TechnologyMirpurAJK 10250Pakistan

In this paper,the(3+1)-dimensional nonlinear evolution equation is studied *** bilinear form of given model is achieved by using the Hirota bilinear *** a result,the lump waves and col-lisions between lumps and periodic waves,the collision among lump wave and single,double-kink soliton solutions as well as the collision between lump,periodic,and single,double-kink soliton solutions for the given model are ***,some new traveling wave solutions are developed by applying the exp(−φ(ξ))expansion *** 3D,2D and contours plots are drawn to demonstrate the nature of the nonlinear model for setting appropriate set of *** a result,a collection of bright,dark,periodic,rational function and elliptic function solutions are *** applied strategies appear to be more powerful and efficient approaches to construct some new traveling wave structures for various contemporary models of recent era.

关键词： The Hirota bilinear method Lump wave solution Travelling wave solution Exp(−φ(ξ))expansion technique

Directional H^(2) Compression Algorithm: Optimisations and Application to a Discontinuous Galerkin BEM for the Helmholtz 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 2022年第5期31卷 1585-1635页

作者： nadir-Alexandre Messaï Sebastien Pernet Abdesselam Bouguerra ONERA/DTIS Universitéfédérale de Toulouse F-31000 Toulouse France Laboratoire de Physique de la Matière et du Rayonnement(LPMR) Département de Sciences de la MatièreUniversitéde Souk-AhrasBP 155341000 Souk-AhrasAlgeria

This study aimed to specialise a directional H^(2)(DH^(2))compression to matrices arising from the discontinuous Galerkin(DG)discretisation of the hypersingular equation in *** significantfinding is an algorithm that takes a DG stiffness matrix andfinds a near-optimal DH^(2) approximation for low and high-frequency *** introduced the necessary special optimisations to make this algorithm more efficient in the case of a DG stiffness ***,an automatic parameter tuning strategy makes it easy to use and *** comparisons with a classical Boundary Element Method(BEM)show that a DG scheme combined with a DH^(2) gives better computational efficiency than a classical BEM in the case of high-order finite elements and hp heterogeneous *** results indicate that DG is suitable for an auto-adaptive context in integral equations.

关键词： Integral equation boundary element method Helmholtz equation discontinuous Galerkin directional H^(2)-matrix low-rank approximation all frequency compression algorithm

Effect of early atopic sensitization in children aged 0–2 years on the development of asthma symptoms at 9–11 years of age

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 Pediatrics 2022年第11期18卷 753-760页

作者： Himmet Haluk Akar Ebru nadir Burçin Beken Yakup Yeşil Division of Pediatric Immunology and Allergy University of Istanbul Health SciencesKanuni Sultan Suleyman Training and Research HospitalIstanbulTurkey Division of Pediatrics University of Istanbul Health SciencesKanuni Sultan Suleyman Training and Research HospitalIstanbulTurkey Department of Pediatric Immunology and Allergy School of MedicineAcibadem Mehmet Ali Aydinlar UniversityIstanbulTurkey

Background Personal genetic predisposition and early life environmental factors are important for the development of childhood *** aimed to search whether egg,milk and mite sensitizations at 0–2 years old are risk factors for asthma symptoms at 9–11 years *** A total of 210 wheezer children who had specific immunoglobulin(Ig)E in 2010–2012 were included in the study(followed by pediatric allergy).Patients were divided into non-atopic(group 1,n=157)and atopic patients[groups 2–7,n=53(5 patients were in both group 4 and group 5)]based on *** the International Study of Asthma and Allergy in Childhood questionnaire,current wheeze(CW,2nd question),exercise wheezing(EW,7th question),and dry cough(DC,8th question)were ***,parental allergies,eczema at 0–2 years,current eosinophil percentage and total IgE were *** Eczema was observed as an important risk factor[CW:odds ratio(OR)=2.83,95%confidence interval(CI)=1.54–5.23,P≤0.001;EW:OR=2.71,95%CI=1.33–5.54,P=0.006;DC:OR=3.03,95%CI=1.47–6.25,P=0.003],whereas having no atopic sensitization at 0–2-year-old(group 1)was found as a significant protective factor for asthma at 9–11 years old(CW:OR=0.32,95%CI=0.15–0.70,P=0.004;EW:OR=0.21,95%CI 0.10–0.44,P≤0.001;DC:OR=0.25,95%CI=0.10–0.59,P=0.002).Conclusion Early personal eczema is a significant risk factor for the development of asthma symptoms at 9–11 years old,whereas not having an allergic sensitization at 0–2 years old(group 1)is an important protective factor.

关键词： Asthma Children Risk factors

Structural and Optical Properties of GaAs_(0.5)Sb_(0.5) and In_(0.5)Ga_(0.5)As_(0.5)Sb_(0.5):ab initio Calculations for Pure and Doped Materials

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 Letters 2012年第3期29卷 193-196页

作者： Mazin SH.Othman Khudheir A.Mishjil nadir F.Habubi Department of General Science Faculty of EducationSoran UniversitySoran-ErbilIraq Department of Physics College of EducationAl-Mustansiriyah UniversityIraq

We perform a first-principles study to evaluate the structural,electronic and optical properties of GaAs_(x)Sb_(1-x) ternary and In_(y)Ga_(1-y)As_(x)Sb_(1-x) quaternary semiconductor alloys up to x=0.5,y=*** employ the Perdew-Burke-Ernzerhof form of the generalized gradient approximation(GGA)within the framework of density functional theory(DFT)by using a simulation *** are carried out in different *** these alloys,lattice parameters and optical band gap energy are *** optical band gaps varywith increasing and decreasing As and In concentrations,*** optical conductivity,absorption and the real part of the dielectric function ε1(ω) are *** results agree well with the theoretical and experimental data available in the literature.

关键词： alloys quaternary ternary

Proposition and design of a new Micro-Architected Domes family:A biomimicry-based approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2024年第3期13卷 650-667页

作者： nadir Rihani Iatimad Akhrif Mostapha El Jai Euromed Polytechnic School Euromed Center of ResearchEuromed University of FesFesMorocco Mechanic Mechatronic and Command LaboratoryENSAM-MeknesMoulay Ismail UniversityMeknesMorocco

In the last decade,micro-architected structures have gained significant attention in academia and industry for their lightweight,strong,and thermally efficient *** by biomimicry design,this paper presents a novel ribbed family of additively manufactured Micro-Architected Domes(MAD).The design incorporates tetrapod pyramid unit cells,golden ratio-based fractal patterns,Schoen’s Minimal Gyroid,and spherical *** study focuses on dome radius,height,and azimuth/elevation partitioning as input variables,with the main output being ribbed micro-cell *** relationships between unit-cells’diameter and input variables were established through problem-solving and numerical computations:linear dependency with the dome radius and hyperbolic dependency with the azimuth and elevation *** proposed design successfully adhered to the Surface-to-Volume ratio of Schoen’s Minimal Gyroid,achieving an average volume relative density of 2.5%,confirming its lightweight *** feasibility of the design was further supported by fabricating three specimens using Filament Fused *** research showcases the potential of biomimicry-inspired micro-architected structures,paving the way for innovative applications in various fields.

关键词： Micro-architected structures Domes Biomimicry Mathematical design Optimization Fractal decomposition

Effects of Selected Printing Parameters on the Fire Properties of 3D-Printed Neat Polylactic Acid(PLA)and Wood/PLA Composites

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

Journal of Renewable Materials 2021年第11期9卷 1883-1895页

作者： Nataša Knez Mirko Kariž Friderik Knez nadir Ayrilmis Manja Kitek Kuzman Fire Laboratory and Fire Engineering Slovenian National Building and Civil Engineering InstituteLjubljanaSI-1000Slovenia Department of Wood Science and Technology Biotechnical FacultyUniversity of LjubljanaLjubljanaSI-1000Slovenia Department of Wood Mechanics and Technology Forestry FacultyIstanbul University-CerrahpasaIstanbul34473Turkey

The effects of selected printing parameters on the fire properties of additively produced composites from neat polylactic acid(PLA)and wood/PLA filaments were *** reaction to fire of the 3D-printed specimens was tested according to the ISO 5660-1 cone calorimeter test *** results showed that the properties of the specimens when exposed to fire were significantly affected by the incorporation of wood flour into the PLA *** was also interesting that PLA specimens had much better reactions to fire than the wood/PLA *** to ignition was found to be much longer in the 3D-printed PLA *** the maximal heat release rate was a little higher in the PLA than the wood/PLA specimens,the duration of HRR was longer for the wood/PLA *** initial mass of the specimens was smaller in the wood/PLA composites,but during the radiant heat exposure the mass typically decreased slower than in the PLA specimens.

关键词： Reaction to fire wood polylactic acid(PLA) filament 3D printer biocomposite

Current perspectives on mesenchymal stromal cell therapy for graft versus host disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2023年第6期20卷 613-625页

作者： nadir Kadri Syivie Amu llen lacobaeus Erik Boberg Katarina Le Blanc Department of Laboratory Medicine Karolinska InstitutetStockholmSweden Department of Clinical Neuroscience Division of NeurologyKarolinska Institute and Karolinska University HospitalStockholmSweden Department of Haematology Karolinska University HospitalStockholmSweden Department of Cell Therapies and Allogeneic Stem Cell Transplantation Karolinska University Hospital StockholmSweden

Graft versus host disease(GvHD)is the clinical condition in which bone marrow-derived mesenchymal stromal cells(MsCs)have been most frequently *** this review,we summarize the experience from clinical trials that have paved the way to *** MsC-based therapy has shown an exceptional safety profile,identifying potency assays and disease biomarkers that reliably predict the capacity of a specific MSC batch to alleviate GvHD has been *** GvHD diagnosis and staging are based solely on clinical criteria,individual patients recruited in the same clinical trial may have vastly different underlying biology,obscuring trial outcomes and making it difficult to determine the benefit of MsCs in subgroups of *** accumulating body of evidence indicates the importance of considering not only the cell product but also patient-specific biomarkers and/or immune characteristics in determining MSC responsiveness.A mode of action where intravascular MSC destruction is followed by monocyte-efferocytosis-mediated skewing of the immune repertoire in a permissive inflammatory environment would both explain why cell engraftment is irrelevant for MsC efficacy and stress the importance of biologic differences between responding and nonresponding *** recommend a combined analysis of clinical outcomes and both biomarkers of disease activity and MSC potency assays to identify patients with GvHD who are likely to benefit from MSC therapy.

关键词： MSC GVHD Hematological malignancies acute GVHD chronic GVHD