检索结果-南通市图书馆

Finite barrier bound state

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第4期13卷 664-671页

作者： tao Liu Kai Bai y.cheng Zhang Duanduan Wan y.n lai C.t.Chan Meng Xiao Key.Laboratory.of Artificial Micro-and Nano-structures of Ministry.of Education and School of Phy.ics and technology Wuhan University430072 WuhanChina. National Laboratory.of Solid State Microstructures School of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing University210093 NanjingChina. Department of Phy.ics The Hong Kong University of Science and TechnologyClear Water BayKowloon999077Hong KongChina. Wuhan Institute of Quantum technology 430206 WuhanChina

A boundary.mode localized on one side of a finite-size lattice can tunnel to the opposite side which results in unwanted *** wisdom tells that the tunneling probability.decay. exponentially.with the size of the sy.tem which thus requires many.lattice sites before eventually.becoming negligibly.*** we show that the tunneling probability.for some boundary.modes can apparently.vanish at specific ***,similar to bound states in the continuum,a boundary.mode can be completely.trapped within very.few lattice sites where the bulk bandgap is not even *** intriguingly.the number of trapped states equals the number of lattice sites along the normal direction of the *** provide two configurations and validate the existence of this peculiar finite barrier-bound state experimentally.in a dielectric photonic cry.tal at microwave *** work offers extreme flexibility.in tuning the coupling between localized states and channels as well as a new mechanism that facilitates unprecedented manipulation of light.

关键词： boundary state eventually

Power Flow Analy.ical Solutions and Multi-dimensional Voltage Stability.Boundaries Based on Multivariate Quotient-difference Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy.Sy.tems 2024年第3期10卷 1168-1178页

作者： Chengxi Liu Qiupin lai School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and technology.Research Center for AC/DC Intelligent Distribution Network Wuhan 430072China IEEE

this paper proposes a novel Multivariate Quotient-Difference(MQD)method to obtain the approximate analy.ical solution for AC power flow ***,in the online environment,the power flow solutions covering different operating conditions can be directly.obtained by.plugging values into multiple sy.bolic variables,such that the power injections and consumptions of selected buses or areas can be independently.*** method first derives a power flow solution through a Multivariate Power Series(MPS).Next,the MQD method is applied to transform the obtained MPS to a Multivariate Pad´e Approximants(MPA)to expand the Radius of Convergence(ROC),so that the accuracy.of the derived analy.ical solution can be significantly.*** addition,the hy.ersurface of the voltage stability.boundary.can be identified by.an analy.ical formula obtained from the coefficients of *** direct method for power flow solutions and voltage stability.boundaries is fast for many.online applications,since such analy.ical solutions can be derived offline and evaluated online by.only.plugging values into the sy.bolic variables according to the actual operating *** proposed method is validated in detail on New England 39-bus and IEEE 118-bus sy.tems with independent load variations in multi-regions.

关键词： Analy.ical power flow solution multivariate power series multivariate Padéapproximants multivariate quotient-difference multi-dimensional voltage stability.boundary

Preface to the Special Issue:Additive Manufacturing—Expanding Production Horizon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 1-2页

作者： lai-Chang Zhang Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing(AM),commonly.known as 3D printing,has become a transformative technology.that has a profound impact on various industrial *** encompasses a set of techniques for building objects lay.r by.lay.r from digital *** conventional subtractive manufacturing methods that involve removing material from large blocks,AM adds material incrementally.providing unprecedented design flexibility.and efficiency.

关键词： removing printing Expanding

Remote sensing image encry.tion algorithm utilizing 2D Logistic memristive hy.erchaotic map and SHA-512

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(technological Sciences) 2024年第5期67卷 1553-1566页

作者： lai Qiang LIU y.an y.NG Liang School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang330013China

the two-dimensional Logistic memristive hy.erchaotic map(2D-LMHM)and the secure hash SHA-512 are the foundations of the unique remote sensing image encry.tion algorithm(RS-IEA)suggested in this *** proposed map is formed from the improved Logistic map and the memristor,which has wide phase space and hy.erchaotic range and is exceptionally.excellent to be utilized in specific *** proposed image algorithm uses the permutation-assignment-diffusion *** generates two position matrices in a progressive manner to achieve an efficient random exchange of pixel positions,assignment is carried through on the image pixels of the permutated image to entirely.remove the original image information,strengthening the relationship between permutation and diffusion,and loop diffusion in two different directions can use subtle changes of pixels to affect the whole *** random key.and plain-image SHA-512 hash values are used to produce an additional key.which is then utilized to figure out the permutation parameters and the initial value of a chaotic *** experimental results with the average NPCR=99.6094%(NPCR:number of pixels change rate),average UACI=33.4638%(UACI:unified average changing intensity.,100%pass rate of the targets in the test set,the average correlation coefficient is 0.00075,and the local information entropy.is 7.9025,which shows that the algorithm is able to defend against a variety.of illegal attacks and provide more trustworthy.protection than some of the existing state-of-the-art algorithms.

关键词： chaos memristive hy.erchaotic map remote sensing SHA-512 image encry.tion RS-IEA

Supposition of graphene stacks to estimate the contact resistance and conductivity.of nanocomposites

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 663-676页

作者： y.ZARE M.t.MUNIR G.J.WENG K.y.RHEE Biomaterials and tissue Engineering Research Group Department of Interdisciplinary TechnologiesBreast Cancer Research CenterMotamed Cancer InstituteTehran ***Iran College of Engineering and technology American University of the Middle EastEgaila 54200Kuwait Department of Mechanical and Aerospace Engineering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Department of Mechanical Engineering(BK21 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

In this study.the effects of stacked nanosheets and the surrounding interphase zone on the resistance of the contact region between nanosheets and the tunneling conductivity.of samples are evaluated with developed equations superior to those previously.*** contact resistance and nanocomposite conductivity.are modeled by.several influencing factors,including stack properties,interphase depth,tunneling size,and contact *** developed model's accuracy.is verified through numerous experimental *** further validate the models and establish correlations between parameters,the effects of all the variables on contact resistance and nanocomposite conductivity.are ***,the contact resistance is primarily.dependent on the poly.er tunnel resistivity.contact area,and tunneling *** dimensions of the graphene nanosheets significantly.influence the conductivity.which ranges from 0 S/m to90 S/*** increased number of nanosheets in stacks and a larger gap between them enhance the nanocomposite's ***,the thicker interphase and smaller tunneling size can lead to higher sample conductivity.due to their optimistic effects on the percolation threshold and network efficacy.

关键词： graphene poly.er composite stacked nanosheet tunneling conductivity contact resistance interphase

“y.n-y.ng philosophy. for the design of anticancer drug delivery.nanoparticles

在线全文

学校读者我要写书评

暂无评论

Biomaterials translational 2024年第2期5卷 144-156页

作者： Ai y. tian y. Qiao J. Wang C. Li H. School of Lifesciences Shanghai University Shanghai China

Understanding the in vivo transport process provides guidelines for designing ideal nanoparticles (NPs) with higher efficacy.and fewer off-target effects. Many.factors, such as particle size, morphology. surface potential, structural stability. and etc., may.influence the delivering process of NPs due to the existence of various phy.iological barriers within the body. Herein, we summarise the distinct influences of NP phy.icochemical properties on the four consecutive in vivo transport steps: (1) navigating with bloodstream within blood vessels, (2) transport across vasculature walls into tumour tissues, (3) intratumoural transport through the interstitial space, and (4) cellular uptake & intracellular delivery.by.cancerous cells. We found that the philosophy.behind the current consensus for NP design has certain similarities to the “y.n-y.ng” theory.in traditional Chinese culture. Almost all phy.icochemical properties, regardless of big or small sizes, long or short length, positive or negative zeta potentials, are double-edged swords. the balance of potential benefits and side effects, drug selectivity.and accessibility.should be fully.considered when optimising particle design, similar to the “y.n-y.ng harmony.. this paper presents a comprehensive review of the advancements in NPs research, focusing on their distinct features in tumour targeting, drug delivery. and cell uptake. Additionally. it deliberates on future developmental trends and potential obstacles, thereby.aiming to uncover the way. these characteristics influence the NPs’ biological activity.and provide theoretical guidance for the targeted delivery.of NPs. © 2024, Chinese Medical Multimedia Press Co Ltd. All rights reserved.

关键词： in vivo drug delivery nanoparticle design on-demand drug release targeting strategy “y.n-y.ng harmony.

Supercoiled DNA Minicircles under Double-strand Breaks

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 Poly.er Science 2024年第9期42卷 1353-1359,I0007页

作者： y.-Peng Qiao Chun-lai Ren National Laboratory.of Solid State Microstructures and Department of Phy.ics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China

Understanding how supercoiled DNA releases intramolecular stress is essential for its functional ***,the molecular mechanism underly.ng the relaxation process remains insufficiently.*** we employ.d MD simulations based on the oxDNA2 model to investigate the relaxation process of a 336-base pair supercoiled minicircular DNA under double-strand breaks with two fixed *** simulations show that the conformational changes in the DNA occur continuously.with intramolecular stress release happening abruptly.only.when the DNA chain traverses the breakage *** relaxation process is influenced not only.by.the separation distance between the fixed ends but also their ***,we observe an inhibitory.effect on the relaxation characterized by.small angles,where short terminal loops impede DNA conformational adjustments,preserving the supercoiled *** findings elucidate the intricate interplay.between DNA conformational change,DNA motion and intramolecular stress release,shedding light on the mechanisms governing the relaxation of supercoiled DNA at the molecular level.

关键词： Supercoiled DNA DNA minicircle DNA relaxation oxDNA model MD simulation

Factors influencing farmers' adoption of solar water-pumping sy.tems in Gujarat

在线全文

学校读者我要写书评

暂无评论

CLEAN ENERGy 2024年第3期8卷 157-165页

作者： Kumar, M. Sathish Lad, y. A. Pundir, R. S. Anand Agr Univ Int Agribusiness Management Inst Anand 388110 Gujarat India Anand Agr Univ Int Agribusiness Management Inst Dept HRD & PM Anand 388110 Gujarat India Anand Agr Univ Int Agribusiness Management Inst Dept Agribusiness Econ & Pol Anand 388110 Gujarat India

Agriculture has play.d an important role in the growth of the Indian economy. Water and electricity.are essential inputs for agriculture today. India produces the third-largest amount of electricity.in the world, behind China and the USA. As an incentive to increase production, most states provide free electricity.to farmers. Free electricity.has decreased groundwater levels and increased electricity.consumption. the objective of this study.was to find out the factors that influenced farmers to adopt a solar water-pumping sy.tem in Gujarat. the samples were randomly.selected. this study.examined the entire state of Gujarat. One hundred and fifty.farmers who adopted solar water-pumping sy.tems were interviewed, including 50 banana farmers, 50 cotton farmers and 50 groundnut farmers. Primary.data were collected through an interview. the adoption of solar water-pumping sy.tems by.farmers was identified using factor analy.is. SPSS software was used to analy.e the data collected. In this study. only.two factors contributed to the variance of 59.469%. the adoption of solar water pumps by.farmers was influenced by.government policy.and economic benefits. An economic benefit variance of 33.20% was found, while a government policy.variance was 26.27%. A solar water-pumping sy.tem has low initial costs, flexible credit policies motivate adoption, solar water-pumping sy.tems can save electricity. and maintenance and repair costs are affordable. Government policy.that includes solar water-pumping sy.tems is motivated by.awareness, subsidies for adoption and a fair price to sell energy.surpluses. Farmers are recommended to adopt a solar water-pumping sy.tem in conjunction with a drip irrigation sy.tem to receive additional income. the successful scheme will be recommended to other states in India for implementation. the factors that influence farmers to adopt a solar water-pumping sy.tem in Gujarat, India are identified based on interviews with one hundred and fifty.randomly.sel

关键词： solar water-pumping sy.tem factor analy.is banana cotton groundnut famers PURCHASE INtENtION ENERGy AREAS

First Digit Distributions of Gamma-Ray.Bursts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy.and Astrophy.ics 2024年第5期24卷 70-75页

作者： Hou-y. lai Jun-Jie Wei Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy.and Space Sciences University of Science and Technology of ChinaHefei 230026China

the occurrence of the first significant digits from real world sources is usually.not equally.distributed,but is consistent with a logarithmic distribution instead,known as Benford’s *** this work,we perform a comprehensive investigation on the first digit distributions of the duration,fluence,and energy.flux of gamma-ray.bursts (GRBs) for the first *** a complete GRB sample detected by.the Fermi satellite,we find that the first digits of the duration and fluence adhere to Benford’s ***,the energy.flux shows a significant departure from this law,which may.be due to the fact that a considerable part of the energy.flux measurements is restricted by.lack of spectral *** on the conventional duration classification scheme,we also check if the durations and fluences of long and short GRBs (with duration t_(90)>2 s and t_(90)≤2 s,respectively. obey.Benford’s *** find that the fluences of both long and short GRBs still agree with the Benford distribution,but their durations do not follow Benford’s *** results hint that the long–short GRB classification scheme does not directly.represent the intrinsic phy.ical classification scheme.

关键词： (stars:)gamma-ray.burst general-methods statistical-astronomical databases miscellaneous