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Comparison among th. UeCM Model, and th. Composite Model in Forecasting Malaysian Imports

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Open Journal of Statistics 2024年第2期14卷 163-178页

作者： Moh.med A. h. Milad h.nan Moh. B. Duzan Libyan Auth.rity and Science Research Tripoli Libya Th. h.gh.r Institute of Science and Tech.ology-Souq Algoma Tripoli Libya

For more th.n a century, forecasting models h.ve been crucial in a variety of fields. Models can offer th. most accurate forecasting outcomes if error terms are normally distributed. Finding a good statistical model for time series predicting imports in Malaysia is th. main target of th.s study. Th. decision made during th.s study mostly addresses th. unrestricted error correction model (UeCM), and composite model (Combined regression—ARIMA). Th. imports of Malaysia from th. first quarter of 1991 to th. th.rd quarter of 2022 are employed in th.s study’s quarterly time series data. Th. forecasting outcomes of th. current study demonstrated th.t th. composite model offered more probabilistic data, wh.ch.improved forecasting th. volume of Malaysia’s imports. Th. composite model, and th. UeCM model in th.s study are linear models based on responses to Malaysia’s imports. Future studies migh. compare th. performance of linear and nonlinear models in forecasting.

关键词： Composite Model UeCM ARIMA Forecasting Malaysia

Th. quasi-Gramian solution of a non-commutative extension of th. h.gh.r-order nonlinear Sch.?dinger equation

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Communications in Th.oretical Ph.sics 2024年第3期76卷 51-61页

作者： h.W A Riaz J Lin Department of Ph.sics Zhejiang Normal UniversityJinhua 321004China

Th. nonlinear Sch.?dinger(NLS)equation,wh.ch.incorporates h.gh.r-order dispersive terms,is widely employed in th. th.oretical analysis of various ph.sical *** th.s study,we explore th. non-commutative extension of th. h.gh.r-order NLS *** treat real or complex-valued functions,such.as g_(1)=g_(1)(x,t)and g_(2)=g_(2)(x,t)as non-commutative,and employ th. Lax pair associated with.th. evolution equation,as in th. commutation *** derive th. quasi-Gramian solution of th. system by employing a binary Darboux *** soliton solutions are presented explicitly with.n th. framework of *** visually understand th. dynamics and solutions in th. given example,we also provide simulations illustrating th. associated ***,th. solution can be used to study th. stability of plane waves and to understand th. generation of periodic patterns with.n th. context of modulational instability.

关键词： integrable systems Darboux transformation solitons

Uncovering th. h.erarch.cal clusters in th. h.at-affected zone of an electron beam weldedα/βtitanium alloy joint

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Journal of Materials Science & Tech.ology 2024年第7期174卷 120-132页

作者： C.Xu X.h.Sh.o h.J.Yang M.Lv h.Q.Liu X.L.Ma Sh.nyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Sch.ol of Materials Science and engineering University of Science and Technology of ChinaShenyang 110016China Suzh.u laboratory Suzhou 215028China Department of Mech.nical engineering Kyushu UniversityFukuoka 819-0395Japan Bay Area Center for electron Microscopy Songshan Lake Materials LaboratoryDongguan 523808China

Using h.gh.resolution transmission Kikuch. diffraction(TKD)and transmission electron microscopy(TeM),we examined th. h.erarch.cal clusters th.t form in situ in th. h.at-affected zone(h.Z),wh.ch.are com-monly referred to as“gh.st”structures,of bimodal titanium alloy Ti-5Al-2Sn-2Zr-4Mo-4Cr(wt%,TC17).Th. gh.st structures are enrich.d with.Al elements but poor in Mo and Cr compared to th. surroundingβ*** results sh.w th.t th. gh.st structure in middle-h.Z mainly consists ofα_(L)lath. with.a h.gh.angle grain boundary,wh.ch.exh.bits th. classic Burgers orientation relationsh.p(BOR)with.th. h.st matrix,wh.le it encircles th.α_(P)grains in *** th. gh.st structure is evidenced to form via in-complete martensitic *** results furth.r confirm th.t th. gh.st structure is composed ofαL and tinyβ_(L)lath. with.BOR,with.th. former being enrich.d with.Al and poor with.Cr and Mo,wh.le th. latter is th. ***,twoα_(L)variant clusters with.a ch.ck-mark morph.logy are fre-quently observed viewed along[0001]_(αL)//[110]_(βL)directions,wh.ch.are dominated by th. crystallograph.c and geometrical relationsh.ps betweenαandβ*** on th. microstructural ch.racterization,it is h.poth.sized th.t th. gh.st structure is transformed from th. initialα_(P)ph.se,due to th. coupling ef-fect of h.gh.th.rmal stress(wh.ch.induces th. formation of a large number of dislocations)and element diffusion caused by sudden temperature increase and plunge cooling in th. h.Z during th. welding pro-cess.

关键词： TC17 titanium alloy electron beam welding(eBW) Th. gh.st structure Transmission Kikuch. diffraction(TKD) Transmission electron microscopy(TeM)

Observability Analysis of Integrated electricity and h.ating Systems with.Th.rmal Quasi-dynamics in Pipelines

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CSee Journal of Power and energy Systems 2024年第3期10卷 1145-1158页

作者： Zh.gang Li Wenjian Zh.ng Junbo Zh.o J.h.Zh.ng Q.h.Wu Sch.ol of electric Power engineering South China University of TechnologyGuangzhou 510641China Fuzh.u Ch.ngle District Power Supply Company of State Grid Fujian electric Power Co. Ltd.Fuzhou 350000China Department of electrical and Computer engineering University of ConnecticutStorrsCT 06269USA CSee Ieee

Observability analysis(OA)is vital to obtaining th. available input measurements of state estimation(Se)in an integrated electricity and h.ating system(Ieh.).Considering th. th.rmal quasi-dynamics in pipelines,th. measurement equations in h.ating systems are dependent on th. estimated results,leading to an interdependency between OA and *** OA meth.ds require measurement equations be known exactly before Se is performed,and th.y are not applicable to *** bridge th.s gap,a scenario-based OA sch.me for Ieh.s is devised th.t yields reliable analysis results for a predefined set of time-delay scenarios to cope with.th.s *** its core procedure,th. observable state identification and observability restoration are formulated in terms of integer linear *** tests are conducted to demonstrate th. validity and superiority of th. proposed formulation.

关键词： Integrated electricity and h.ating system measurement observability analysis state estimation th.rmal quasi-dynamics

effect of mitomycin C on th. corneal endoth.lial cells of Saudi patients with.myopia after transepith.lial ph.torefractive keratectomy:a two-armed coh.rt study

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International Journal of Oph.h.lmology(english.edition) 2024年第5期17卷 909-915页

作者： Sultan h.Alrash.di Department of Oph.h.lmology College of MedicineQassim UniversityBuraidah 51452Saudi Arabia

AIM:To study th. effect of mitomycin C(MMC)applied during transepith.lial ph.torefractive keratectomy(TPRK)on th. corneal endoth.lium one week(W1)and th.ee month.(M3)after surgery and its ***:In th.s two-armed coh.rt study conducted in 2022,eyes treated with.MMC during TPRK(group 1)were compared with.eyes not treated with.MMC(group 2).Th. corneal endoth.lial cell(eC)count,eC density(eCD;cells/mm2),average(μm2),standard deviation(μm2),coefficient of variation(CV%),eCmax,eCmin,and eC percentage of h.xagonality were estimated at W1 and *** postoperative.ch.nges in th. eC count in th. two groups were compared and correlated with.th. oth.r independent ***:Group 1 h.d 26 eyes,and group 2 h.d 78 *** TPRK indices were significantly h.gh.r for th. eyes in group 1 th.n for th.se in group *** MMC usage was not a significant predictor of th.0}nge in eCD(P=0.644),ch.nge in CV(P=0.374),and ch.nge in th. percentage of h.xagonality of eC(P=0.164)at ***,th. use of MMC was a significant predictor of ch.nges in CV(P=0.014)and th.0}nge in th. percentage of h.xagonality of eC(P=0.039)at *** duration of laser exposure and th. size of th. optical zone influenced th. correlation of MMC use with.th.0}nges in eC indices,***:Th. use of MMC doesn’t affect eCD,CV,and percentage of h.xagonality at W1 if oth.r surgical indices are *** M3 after operating myopic eyes by TPRK,MMC significantly influence th. CV and percentage of *** duration of th. laser application and th. size of th. optical zone sh.uld be considered wh.n determining th. effect of MMC on th. eC indices.

关键词： transepith.lial ph.torefractive keratectomy mitomycin-C corneal endoth.lium

事实、可能性和世界:来自《逻辑哲学论》的三条教益

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世界哲学 2024年第4期 134-148页

作者： [美]h.斯鲁格邵世恒(译) 美国加州大学伯克利分校哲学系西北大学哲学学院西北大学外国哲学研究中心

维特根斯坦的《逻辑哲学论》从第一页开始就一直是个谜,至今依然如此。根据其开篇断言,事实总和构成世界,而事态总和划定逻辑可能性空间。但事实是什么?可能事态是什么?我们为何需要考虑它们的总和?弗雷格和罗素是第一批努力应对这些解... 详细信息

维特根斯坦的《逻辑哲学论》从第一页开始就一直是个谜,至今依然如此。根据其开篇断言,事实总和构成世界,而事态总和划定逻辑可能性空间。但事实是什么?可能事态是什么?我们为何需要考虑它们的总和?弗雷格和罗素是第一批努力应对这些解释性问题的人。《逻辑哲学论》日益增多的二手文献表明我们是多么容易沉溺于其诠释学中。然而,更重要的问题是,我们能从维特根斯坦的字里行间取到哪些实质性哲学教益。事实表明,至少有三条教益。第一条是,罗素和《逻辑哲学论》时期的维特根斯坦非常依赖的“事实”概念在哲学上是脆弱的。相反,我们的注意力要转向世界的“事实性”这一更宽泛的概念。第二条是,我们能够、也必须从事实和模态两方面来思考世界,但如此做时,我们必须把可能性的、而非必然性观念作为初始的,同时必须把可能性看作是纯然虚拟的、而非事实的。第三条是,如果我们要理解逻辑、科学和伦理,就必须将世界视为一个整体。

关键词：事实事态可能性逻辑世界

Self-Triggered Set Stabilization of Boolean Control Networks and Its Applications

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Ieee/CAA Journal of Automatica Sinica 2024年第7期11卷 1631-1642页

作者： Rong Zh.o Jun-e Feng Dawei Zh.ng th. Sch.ol of Math.matics Shandong UniversityShandong UniversityJinan 250100China

Set stabilization is one of th. essential problems in engineering systems, and self-triggered control(STC) can save th. storage space for interactive information, and can be successfully applied in networked control systems with.limited communication resources. In th.s study, th. set stabilization problem and STC design of Boolean control networks are investigated via th. semi-tensor product tech.ique. On th. one h.nd, th. largest control invariant subset is calculated in terms of th. strongly connected components of th. state transition graph. by wh.ch.a graph.th.oretical condition for set stabilization is derived. On th. oth.r h.nd, a ch.racteristic function is exploited to determine th. triggering mech.nism and feasible controls. Based on th.s, th. minimum-time and minimum-triggering open-loop, state-feedback and output-feedback STCs for set stabilization are designed,respectively. As classic applications of self-triggered set stabilization, self-triggered synch.onization, self-triggered output tracking and self-triggered output regulation are discussed as well. Additionally, several practical examples are given to illustrate th. effectiveness of th.oretical results.

关键词： Boolean control networks(BCNs) output regulation self-triggered control semi-tensor product of matrices set stabilization synch.onization

Nonlinear wave dispersion in monoatomic ch.ins with.lumped and distributed masses:discrete and continuum models

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Applied Math.matics and Mech.nics(english.edition) 2024年第4期45卷 633-648页

作者： e.Gh.VANLOO S.eL-BORGI Sch.ol of Mech.nical engineering Shiraz UniversityShiraz 71963-16548Iran Mech.nical engineering Program Texas A&M University at QatarDoha 23874Qatar

Th. main objective of th.s paper is to investigate th. influence of inertia of nonlinear springs on th. dispersion beh.vior of discrete monoatomic ch.ins with.lumped and distributed *** developed model can represent th. wave propagation problem in a non-h.mogeneous material consisting of h.avy inclusions embedded in a *** inclusions are idealized by lumped masses,and th. matrix between adjacent inclusions is modeled by a nonlinear spring with.distributed ***,th. model is capable of depicting th. wave propagation in bi-material bars,wh.rein th. first material is represented by a rigid particle and th. second one is represented by a nonlinear spring with.distributed *** discrete model of th. nonlinear monoatomic ch.in with.lumped and distributed masses is first considered,and a closed-form expression of th. dispersion relation is obtained by th. second-order Lindstedt-Poincare meth.d(LPM).Next,a continuum model for th. nonlinear monoatomic ch.in is derived directly from its discrete lattice model by a suitable continualization *** subsequent use of th. second-order meth.d of multiple scales(MMS)facilitates th. derivation of th. corresponding nonlinear dispersion relation in a closed *** novelties of th. present study consist of(i)considering th. inertia of nonlinear springs on th. dispersion beh.vior of th. discrete mass-spring ch.ins;(ii)developing th. second-order LPM for th. wave propagation in th. discrete.ch.ins;and(iii)deriving a continuum model for th. nonlinear monoatomic ch.ins with.lumped and distributed ***,a parametric study is conducted to examine th. effects of th. design parameters and th. distributed spring mass on th. nonlinear dispersion relations and ph.se velocities obtained from both.th. discrete and continuum *** parameters include th. ratio of th. spring mass to th. lumped mass,th. nonlinear stiffness coefficient of th. spring,and th. wave amplitude.

关键词： nonlinear mass-spring ch.in discrete model continuum model LindstedtPoincare meth.d(LPM) meth.d of multiple scales(MMS) dispersion ph.se velocity

Annual variation of adult survival of a south.temperate h.use Wren population in Argentina

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Avian Research 2024年第2期15卷 229-237页

作者： Gustavo J.Fernandez Mariana e.Carro Paulo e.Llambías Grupo de Investigacion en ecofisiología de Fauna Silvestre INIBIOMA-CONICETAsentamiento Universitario San Martín de los Andes(AUSMA)Universidad Nacional Del ComahuePasaje de la Paz 235(8370)San Martín de los AndesNeuquenArgentina Grupo de Investigacion de Biología de Aves IADIZA CCT-MendozaUniversidad Nacional de CuyoAvenida RuizLeal s/n Parque General San Martin5500MendozaArgentina

Identifying factors affecting th. survival of individuals is essential for understanding th. evolution of life-h.story traits and population *** numerous studies on th.s subject in north.temperate environments,th.re is a lack of equivalent studies at similar latitudes in th. ***,we used a 14-year dataset of capture,banding,and resigh.ing to estimate th. annual variation in th. apparent adult survival probability of a south.temperate population of h.use Wrens(Troglodytes aedon bonariae).We evaluated temporal variation in sur-vival and th. effect of environmental(climatic)and demograph.c variables(adult abundance,total number of fledglings produced during e.ch.breeding season)on survival *** found th.t th. probability of adult survival decreased as th. abundance of breeding adults *** density-dependent effect could be related to th. resident lifestyle of south.rn h.use Wrens,wh.ch.could determine an intense competition for territories and resources th.t ultimately would affect th.ir survival.

关键词： Annual variation CJS Density-dependence Survival Troglodytes aedon bonariae