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Analytic Results in the Position-Dependent Mass Schrdinger Problem

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Communications in Theoretical Physics 2013年第12期60卷 642-650页

作者： M.S.Cunha H.R.christiansen Grupo de Física Teórica State University of Cear(UECE) State University Vale do Acaraú

We investigate the Schr6dinger equation for a particle with a nonuniform solitonic mass density. First, we discuss in extent the （nontrivial） position-dependent mass V（x） = 0 case whose solutions are hypergeometric functions in tanh2 x. Then, we consider an external hyperbolic-tangent potential. We show that the effective quantum mechanical problem is given by a Heun class equation and find analytically an eigenbasis for the space of solutions. We also compute the eigenstat, es for a potential of the form V （x） = Vo sinh2 z.

关键词： Schr6dinger equation position-dependent mass Heun equation

Ultra-broadband edge-state pair for zigzag-interfaced valley Hall insulators

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 81-89页

作者： Jinhao Zhang Fengwen Wang Ole Sigmund Liang Gao Rasmus E.christiansen State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering Technical University of DenmarkKongens Lyngbv 2800Denmark

The existence of a single topologically protected edge state in the first bulk bandgap for acoustic/elastic valley Hall insulators(VHIs)with zigzag interface configurations(ZICs)is well ***,in this work,we show that an ultra-broadband edgestate pair in this bandgap can be created using the inverse design by topology *** valley Hall insulator design increases the operational bandwidth 121%compared with an existing valley Hall insulator from recent literature and exhibits extreme field confinement,where more than 99%of the field intensity is concentrated within three unit-cells from the ***-way propagation and topological robustness towards small cavity defects are confirmed for the full *** exploitation of such edge-state pairs of valley Hall insulators opens an avenue for realizing broadband confined edge *** tests for disorder and bend defects,we show that the additional ZIC,with a different operational frequency interval,encountered at the defects,degrades the transmission for bend and disorder defects which may prove significant for the application of *** an alternative topology optimization method based on two ZICs,we further increase their common operational bandwidth.

关键词： valley Hall insulators zigzag interface configuration edge-state pair topology optimization

Seismic hazard analysis for central-western Argentina

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Geodesy and Geodynamics 2018年第1期9卷 25-33页

作者： Salvador Daniel Gregori Rodolfo christiansen Instituto Geofísico Sismológico Volponi Nacional de San Juan(National University of San Juan)San JuanArgentina CONICET(National Scientific and Technical Research Council) San JuanArgentina

In this study, we present a PSHA（Probabilistic Seismic Hazard Analysis） for the city of San Juan, which is located in the central-western region of Argentina（30°S-35.5°S; 66.5°W-71°W）. In addition to crustal earthquakes provided by catalogues, recent paleoseismological and neotectonic investigations have permitted to consider events which occurred during the last 400 *** seismogenic sources that could cause damages to the studied site corresponding to Precordillera,Western Sierras Pampeanas, Basement of the Cuyana Basin and Cordillera Principal were *** on the evaluation of the contribution of these sources,maximum moment magnitudes above 7.5（Mw） are *** values of SA（spectral acceleration）（0.2 and 1 s periods） and PGA（peak ground acceleration） were found in the city of San Juan, which suggests that it is located in a zone of high seismic ***, the obtained SA spectra were compared with the seismic-resistant construction standards of Argentina INPRES-CIRSOC 103 [1]. Results suggest that for the city of San Juan and for a return period of475 years, it covers the seismic requirements of the structures.

关键词： Probabilistic seismic hazard analysis Seismic-resistant construction standards Seismic sources Visual cumulative method

Thinking about worry:A systematic review and meta-analysis on the assessment of metacognitions in children and adolescents

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World Journal of Psychiatry 2021年第9期11卷 635-658页

作者： Laura M Kocher Kai Schneider Hanna christiansen Department of Psychology University of MarburgMarburg 35037Germany Department of Clinical Child and Adolescent Psychology University of LandauLandau 76829Germany

BACKGROUND The metacognitive model of generalized anxiety disorder identifies three forms of metacognition:Positive metacognitive beliefs about worry(POS),negative metacognitive beliefs about worry(NEG),and *** this model was originally developed relying on adult samples,it has since been applied to children and youth in different studies,and results mostly support its validity for this *** the roles of POS,meta-worry,and age-effects do not appear to be fully clarified for children and adolescents yet,an integration of studies on children and adolescents and the metacognitive model is both timely and *** To summarize the current research on relationships,age-effects,and measurements for POS,NEG,and meta-worry in childhood and *** We carried out a literature search in the electronic databases PsycINFO,PubMed,PSYNDEX,and ERIC in 2017 and updated in *** research in German or English language on metacognition was included with child and adolescent samples diagnosed with anxiety disorders or healthy controls if POS,NEG,or meta-worry were *** were included for meta-analysis if they reported correlations between these metacognitions and anxiety or *** rating for eligibility was done for 20.89% of full-texts with 90.32% *** of bias was assessed with the appraisal tool for cross-sectional studies and consensus rating of appraisal tool for cross-sectional studies for 20.83% of included studies attaining agreement of intraclass correlation=***,correlations between metacognitions,anxiety and worry were calculated with RevMan 5.4.1,assuming random-effects ***-regressions with mean age as the covariate were performed via the online tool MetaMar ***-ID:*** Overall,k=763 records and k=78 additional records were *** those,k=48 studies with 12839 participants were included and of those,k=24 studies were included for *** studie

关键词： Metacognition Anxiety Child Adolescent Measures Meta-analysis

Nonlinear Viscoelastic Response of Thermoplastic-Elastomer Melts

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Advances in Applied Mathematics and Mechanics 2010年第1期2卷 1-31页

作者： Aleksey D.Drozdov Erik A.Jensen Jesper deClaville christiansen Danish Technological Institute Gregersensvej 12630 TaastrupDenmark Aalborg University Fibigerstraede 169220 AalborgDenmark

Observations are reported on thermoplastic elastomer(ethylene-octene copolymer)melt in small-amplitude shear oscillatory tests and start-up shear tests with various strain rates in the interval of temperatures between 120 and 210◦*** on the concept of heterogeneous non-affine polymer networks,constitutive equations are developed for the thermo-mechanical behavior of a melt at threedimensional deformations with finite *** parameters in the stress–strain relations are found by fitting the experimental *** model is applied to the analysis of Poiseuille *** effects of temperature and pressure gradient on the steady velocity profile are studied numerically.

关键词： Non-affine polymer network thermo-viscoelasticity elastomer melt constitutive model Poiseuille flow

Liver sinusoidal endothelial and biliary cell repopulation following irradiation and partial hepatectomy

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World Journal of Gastroenterology 2010年第31期16卷 3928-3935页

作者： Petra Krause Margret Rave-Frank Hendrik Andreas Wolff Heinz Becker Hans christiansen Sarah Koenig Department of General Surgery University Medical Centre Goettingen Department of Radiotherapy University Medical Cen-tre Goettingen

AIM: To investigate whether irradiation (IR) and partial hepatectomy (PH) may prepare the host liver for nonparenchymal cell (NPC) ***: Livers of dipeptidyl peptidase(DPP)-deficient rats were pre-conditioned with external beam IR (25 Gy) delivered to two-thirds of the right liver lobules followed by a one-third PH of the untreated lob-ule. DPP-positive liver cells (NPC preparations enriched for liver sinusoidal endothelial cells (LSECs) and hepatocytes) were transplanted via the spleen into the recipient livers. The extent and quality of donor cell engraftment and growth was studied over a long-term interval of 16 wk after ***: Host liver staining demonstrated 3 different repopulation types. Well def ined clusters of donor-derived hepatocytes with canalicular expression of DPP were detectable either adjacent to or in between large areas of donor cells (covering up to 90% of the section plane) co-expressing the endothelial marker platelet endothelial cell adhesion molecule. The third type consisted of formations of DPP-positive duct-like structures which co-localized with biliary epithelial ***: Liver IR and PH as a preconditioning stimulus enables multiple cell liver repopulation by donor hepatocytes, LSECs, and bile duct cells.

关键词： Cell transplants Dipeptidyl peptidase protein Endothelial cells Liver cell transplantation Liver irradiation Liver repopulation

Analysis of Structure Transition and Compatibility of PTT/PC Blend without Transesterification

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Chinese Journal of Polymer Science 2016年第9期34卷 1172-1182页

作者： Qing-long Song 温慧颖 Jesper de Claville christiansen Dong-hong Yu Chun-sheng Chen 蒋世春 College of Engineering and Technology Northeast Forestry University Harbin 150040 China Department of Mechanical and Manufacturing Engineering Aalborg University DK-9220 Aalborg Denmark Department of Biotechnology Chemistry and Environmental Engineering Aalborg University DK-9220 Aalborg Denmark School of Materials Science and Engineering Tianjin University Tianjin 300072 China

Poly（trimethylene terephthalate）/polycarbonate （PTT/PC） blends were prepared by solvent mixing to avoid transesterification during high temperature blending. The influences of compositions on the thermal behavior, crystallization morphology and structure of the blends were studied. FTIR results indicated that there was no CO0 linking to two phenyl groups on each side chain and DSC results supported no transesterification reaction. DSC curves showed that Tc and Tmc increased to maximum range when PC contents were between 7 wt%-15 wt%, however, Tm decreased constantly with the increase of PC contents. It was observed from POM that PTT spherulitic morphology and crystallization kinetics were obviously influenced by the change of PC contents. Structural evolutions during cooling were investigated by SAXS which showed Lc of PTT remained a constant with different PC contents and also fixed during crystallization, nevertheless, it revealed a maximum value of Lnc for sample PTT93. It was concluded that PC chains could be permeated into not only amorphous crystallite structure but also amorphous lamellae structure and 7 wt% PC content was supposed to be the ＂proper＂ penetration amount into PTT lamellae structure which led to a maximum capacity of amorphous lamellar layer. Fringedmicelle crystal model was adopted to illustrate semi-crystalline physical structures of the blend in two kinds of component aggregation states.

关键词： Solvent mixing Transesterification Lamellae structure Fringed-micelle.

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深圳能源大厦

建筑实践 2019年第6期 26-33页

作者： Bjarke Ingels Andreas Klok Pedersen Martin Voelkle He Song Andre Schmidt Alessio Zenaro Alina Tamosiunaite Alysen Hiller Ana Merino Andreas Geisler Johansen Annette Jensen Armor Rivas Balaj IIulian Brian Yang Baptiste Blot buster christiansen Cecilia Ho Christian Alvarez Christin Svensson Claudia Hertrich Claudio Moretti Cory Mattheis Dave Brown Dennis Rasmussen Doug Stechschulte Eskild Nordbud Felicia Guldberg Fred Zhou Gaetan Brunet Gül Ertekin Henrik Kania Iris Van der Heide James Schrader Jan Magasanik Jan Borgstr?m Jeppe Ecklon Jelena Vucic Jo?o Albuquerque Jonas M?nster Karsten Hansen Malte Kloe Mikkel Marcker Stubgaard Michael Andersen Michal Kristof Min Ter Lim Oana Simionescu Nicklas A. Rasch Philip Sima Rasmus Pedersen Rune Hansen Rui Huang Sofia Gaspar Stanley Lung Sun Ming Lee Takuya Hosokai Todd Bennett Xi Chen Xing Xiong Xiao Lu Xu Li Yijie Dan Zoltan Kalaszi BIG

深圳能源公司办公楼项目总建筑面积为96000m2,旨在让人在深圳的文化、政治和商业中心感到亲切的同时,在城市主轴线上建造一座可持续的新公共地标。本项目的体量和高度由中心区城市总体规划决定。主体建筑由两座塔楼组成,北楼高220m,南楼... 详细信息

深圳能源公司办公楼项目总建筑面积为96000m2,旨在让人在深圳的文化、政治和商业中心感到亲切的同时,在城市主轴线上建造一座可持续的新公共地标。本项目的体量和高度由中心区城市总体规划决定。主体建筑由两座塔楼组成,北楼高220m,南楼高120m,两座塔楼与邻近建筑的塔楼一起在深圳的中心形成一个连续的弧形天际线。在建筑底部,两座塔楼通过一个34m长,包括大厅、会议中心、自助餐厅和展览空间功

关键词： Michael 建筑面积建筑实践

On the problem of the dynamical reactions of a rolling wheelset to real track irregularities

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Railway Engineering Science 2023年第1期31卷 1-19页

作者： Hans True Lasse Engbo christiansen Andreas Lindhardt Plesner Andreas Lønstrup Ammitzbøll Bjørn Jerram Dahl DTU Compute Technical University of DenmarkRichard Petersens Plads Building 3242800Kgs.LyngbyDenmark

We investigate numerically the dynamical reactions of a moving wheelset model to real measured track *** background is to examine whether the dynamics are suitable as the input to the inverse problem:determine the true track geometry from measured wheelset dynamical *** is known that the method works well for the vertical position of the rails but the computed lateral position is often *** find that the lateral motion of the wheelset often may differ from the track *** cases are investigated closely but the reasons remain *** the wheelset dynamics reflect the larger(>4-6 mm)aperiodic track disturbances and single large disturbances quite well,this does not seem to be the case for general smaller or periodic track irregularities or sections behind single large *** resulting dynamics of a wheelset to lateral track irregularities are in general not sufficiently accurate to be used as the basis for a description of the track irregularities.

关键词： Track monitoring Vehicle dynamical response Inverse problem Numerical analysis Estimate of errors Track irregularity