检索结果-南通市图书馆

Delayed plasticity during spherical nanoindentation of an iron-chromium-aluminum alloy:Effect of ferric ion irradiation

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36期167卷 228-236页

作者： y.Zhang C.W.Li J.L.Jiang J.F.Gu H.Wang y.D.Jia G.Wang X.G.An Q.Wang J.Lu Institute of Materials Shanghai UniversityShanghai 200072China school of Materials science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering City University of Hong KongKowloonSARChina science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu610106China

spherical nanoindentation of an iron-chromium-aluminum alloy was conducted to study the effect of ferric-ion(Fe 3+)irradiation on the time-dependent plasticity behavior in the surface layers of this *** was observed that the initiation of plasticity by the appearance of displacement burst or“pop-in”event occurred after a period of waiting time in the apparent elastic regime and that Fe^(3+)irradiation at 360°C and up to∼0.5 displacements per atom could make it happen under the lower applied loads but with a reduced *** the experimental data,an activation volume and activation energy were extracted for the delayed *** results show that Fe^(3+)-irradiation significantly reduced its acti-vation volume from∼3.05 b 3 to∼1.75 b 3(where b=Burgers vector),but slightly increased its activation energy from∼0.65 to∼0.71 *** the other hand,high-resolution scanning transmission electron mi-croscopy observations reveal that the irradiation at the elevated temperature created interstitial atom pair onto the(100)habit plane that can serve as the nucleation site of a100dislocation loop while elim-inating the pre-existing ***,it is indicated that heterogeneous nucleation of the dislocation loop was predominant in the delayed plasticity initiation of this alloy and that the nucleation of the interstitial-type dislocation loop was involved due to Fe^(3+)-irradiation.

关键词： spherical nanoindentation Delayed plasticity FeCrAl alloy Fe^(3+)-irradiation

Psychological interventions for adherence, metabolic control, and coping with stress in adolescents with type 1 diabetes:a systematic review

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 2020年第5期16卷 456-470页

作者： yousef M.Aljawarneh Nesreen M.Al-Qaissi Hana y.Ghunaim Health sciences Division School of NursingHigher Colleges of TechnologyP.O.Box 1626FujairahUnited Arab Emirates Higher Colleges of Technology P.O.Box 1626FujairahUnited Arab Emirates Fatima College of Health sciences Institute of Applied TechnologyP.O.Box 24162Al AinUnited Arab Emirates

Background The aim of this review was to summarize and identify the variations in the effectiveness of psychological interventions on adherence,metabolic control,and coping with stress in adolescents with type 1 diabetes(T1D).Methods An electronic search of literature was performed using PubMed(NLM),Embase(Ovid),CINAHL Plus(EBsCO-host),PsycINFO(Ovid),and Google *** search was limited to include articles reported the effect of one of the psychological interventions:cognitive behavioral therapy(CBT),coping skills training(CsT),stress management,or psychotherapy *** report included peer-reviewed articles published in English from January 1990 until May 2019in adolescents with T1D,and summarizes the results of 24 studies that met the inclusion *** Psychological interventions showed differential effects on adherence,metabolic control,and coping with stress in adolescents with *** interventions using principles of CBT appear to have a superior positive effect on regimen adherence compared with other types of psychological *** contrast,metabolic control was significantly improved with the implementation of CsT and some forms of *** management and psychotherapy interventions showed significant promises for adolescents to cope with their diabetes-related daily *** However,the findings may add some promises to diabetes management in adolescents,additional research to understand the effect of these interventions is needed.

关键词： Adherence Adolescents Coping Metabolic control Type 1 diabetes

ELECTRICAL AND OPTICAL CHARACTERIZATION OF PMMA DOPED WITH y_(0.0025)si_(0.025)Ba_(0.9725)(Ti_((0.9))sn_(0.1))O_3 CERAMIC

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 Journal of Polymer science 2010年第4期28卷 537-546页

作者： Ayman s.Ayesh Department of Physics College of ScienceKing Faisal UniversityAl-AhssaSaudi Arabia

Poly（methylmetacrylate）（PMMA）/ y0.0025si0.025Ba0.9725 （Ti（0.9）sn0.1）O3 （yBTs） composites were prepared at different weight ratios of yBTs （0 wt%, 5 wt%, 10 wt% and 20 wt% yBTs） in order to investigate effect of yBTs additions on the electrical and optical properties of PMMA host. The electrical properties （impedance, dielectric constant dielectric loss and AC conductivity） were studied in the frequency range 10 kHz-1 MHz and in temperature range 20-90℃. Upon increasing the contents of yBTs ceramic, we observed a reduction in the impedance and an increase in the dielectric constant, dielectric loss and AC conductivity of PMMA host. We also found that the relaxation process at high yBTs contents was due to relaxation in the ionic conductivity. The absorption coefficient （α） has been determined in the wavelength range 230-800 nm at room temperature for all yBTs-PMMA composites. Moreover, the addition of yBTs ceramic highly enhances the UV absorption of PMMA host especially below 300 nm. Addition of 20 wt% yBTs ceramic to PMMA host decreases the optical energy gap from 5 eV to 3.41 eV. Correlations between electrical, optical and sEM results are reported.

关键词： Electrical Optical PMMA, Ceramic Ferroelectric Composites

Molar volume of eutectic solvents as a function of molar composition and temperature

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第12期24卷 1779-1785页

作者： Farouq s.Mjalli Petroleum and Chemical Engineering Department Sultan Qaboos University

The conventional Rackett model for predicting liquid molar volume has been modified to cater for the effect of molar composition of the Deep Eutectic solvents(DEs). The experimental molar volume data for a group of commonly used DEs has been used for optimizing the improved model. The data involved different molar compositions of each DEs. The validation of the new model was performed on another set of DEss. The average relative deviation of the model on the training and validation datasets was approximately 0.1% while the Rackett model gave a relative deviation of more than 1.6%. The modified model deals with variations in DEs molar composition and temperature in a more consistent way than the original Rackett model which exhibits monotonic performance degradation as temperature moves away from reference conditions. Having the composition of the DEs as a model variable enhances the practical utilization of the predicting model in diverse design and process simulation applications.

关键词： Molar volume Density Physical properties Ionic liquids Eutectic solvents

EXPONENTIAL MEsH APPROXIMATIONs FOR A 3D EXTERIOR PROBLEM IN MAGNETIC INDUCTION

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2005年第2期23卷 131-152页

作者： séraphinM.Mefire LaboratoireAmiénoisdeMathématiqueFondamentaleetAppliquée CNRSUMR6140UniversitddePicardieJules-Verne33r.Saint-Leu80039AmiensCedex1France

A numerical method combining the approaches of C.I. Goldstein and L.-A. ying is used for the simulation in three-dimensional magnetostatics related to an exterior problem in magnetic induction. Recently introduced, this method is based on the use of a graded mesh obtained by gluing homothetic layers in the exterior domain and has been performed in the case of edge element discretizations. In this work, the theoretical and practical aspects of the method are inspected in the case of face element and volume element discretizations,for computing a magnetic induction. Error estimates, implementations, and numerical results are provided.

关键词： Boundary elements Error estimates Exterior problems Face elements Graded meshes Magnetostatics Mixed formulations Truncations Volume elements

Estimating Out-Crossing Rate of Bg 379-2 Using Morphological Markers and Confirmation by Molecular Markers

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 2012年第2期19卷 166-168页

作者： L.H.M.y.K.sOMARATNE A.s.M.T.ABAyAWICKRAMA I.P.WICKRAMAsINGHE W.L.G.sAMARAsINGHE Department of Agricultural Biology Faculty of AgricultureUniversity of PeradeniyaSri Lanka Rice Research and Development Institute BatalagodaIbbagamuwaSri Lanka

Rice is largely self-fertilized and accordingly a field population of rice is completely composed of near homozygotes. Due to the emergence of off-types, homozygosity will be affected. With the time, this will cause the reduction of genetic purity in some rice varieties. One of the reasons has been suspected to be the high out-crossing frequencies of such varieties. studies were conducted at the Rice Research and Development Institute, Batalagoda, sri Lanka to estimate the out-crossing rate of Bg 379-2, a variety having the problem of maintaining genetic purity. Bg 379-2 was allowed to out-cross with Bg 450 and the number of out- crossed plants were counted using dominant morphological markers such as short-round grain and purple culm of pollen donor. A molecular confirmation of out-crossing was also performed using sequence tagged site （sTs） molecular marker pTA248. The variety Bg 379-2 showed a potential out-crossing rate of 3.41% and an average out-crossing rate of 1.29% using dominant morphological markers. Polymorphism was cleady detected between parents and out-crossed plants as well as selfed plants of Bg 379-2 using their banding patterns. A similar study can be performed to determine the out-crossing rates of other varieties which show high percentage of off-types in the population for the better understanding of the breeding behavior of the varieties.

关键词： rice genetic purity out-crossing marker polymorphism

Fast reconstruction of digital holograms for extended depths of field

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2016年第7期14卷 34-37页

作者： P.W.M.Tsang T.-C.Poon T.Kim y.s.Kim Department of Electronic Engineering City University of Hong Kong Bradley Department of Electrical and Computer Engineering Virginia Tech Dept of Optical Engineering Sejong University

Past research has demonstrated that a static, three-dimensional （3D） object scene can be directly recorded as a complex digital hologram. However, numerical reconstruction of the object scene, which may comprise multiple sections located at unknown distances from the hologram, is a complicated and computation-intensive process. To the best of our knowledge, we propose, for the first time, a low complexity method that is capable of recon- structing a complex hologram, such that sections at different depths in the 3D object scene can be automatically reconstructed at the correct focal distances and merged into a single image for an extended depth of field. We demonstrate an order of magnitude increase of the depth of field for binary objects. With the use of a graphical processing unit, the reconstruction of a 512 × 512 complex hologram can be accomplished in about 100 ms, equivalent to around 10 frames per second.

关键词： Lithography

A semi-supervised hierarchical approach： two-dimensional clustering of microarray gene expression data

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer science 2013年第2期7卷 204-213页

作者： R PRIsCILLA s sWAMyNATHAN Department of Information and science and Technology The College of Engineering Guindy Campus Anna UniversityIndia Chennai 600025

Micro array technologies have become a widespread research technique for biomedical researchers to assess tens of thousands of gene expression values simul- taneously in a single experiment. Micro array data analysis for biological discovery requires computational tools. In this research a novel two-dimensional hierarchical clustering is presented. From the review, it is evident that the previous research works have used clustering which have been ap- plied in gene expression data to create only one cluster for a gene that leads to biological complexity. This is mainly because of the nature of proteins and their interactions. since proteins normally interact with different groups of proteins in Order to serve different biological roles, the genes that produce these proteins are therefore expected to co express with more than one group of genes. This constructs that in micro array gene expression data, a gene may makes its pres- ence in more than one cluster. In this research, multi-level micro array clustering, performed in two dimensions by the proposed two-dimensional hierarchical clustering technique can be used to represent the existence of genes in one or more clusters consistent with the nature of the gene and its attributes and prevent biological complexities.

关键词： clustering hierarchical clustering supervisedclustering overlapping clustering

Invasion and predation in aquatic ecosystems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2011年第5期57卷 613-624页

作者： Judith s. WEIs Department of Biological sciences Rutgers University Newark NJ 07102 USA

This article reviews biological invasions in which predation （or its absence） plays a major role in the success of the invader. Examples are described in which the invader out-competes native species for the same food, and cases in which the in-vader consumes valued native species. In many instances, better predator avoidance by the invasive species or the absence of predators in the new habitat contributes to the success of the invaders; in other cases native or introduced predators appear to be able to keep the invasive species in check. A relatively new management approach in the Us is the idea of adding another trophic level - to have humans act as the predators and consume the invasive species. This approach is being utilized in Florida and throughout the Caribbean against the lionfish, but could be extended to other fishes, as well as to various invasive crustaceans and mollusks. This idea is controversial, and current regulations prohibiting the possession of individuals of the invasive species （e.g., mitten crabs or snakefish） would preclude the development of a fishery for them [Current Zoology 57 （5）： 613~524, 2011].

关键词： Predator Prey Trophic interactions Feeding Food web