bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Second-Order Three-Level Difference Scheme for a Magneto-Thermo-Elasticity Model
Authors: Cao Hai-Yan , Sun Zhi-Zhong , Zhao Xuan 
Published: July 2016

AbstractThis article deals with the numerical solution to the magneto-thermo-elasticity model, which is a system of the third order partial differential equations. By introducing a new function, the model is transformed into a system of the second order generalized hyperbolic equations. A priori estimate with the conservation for the problem is established. Then a three-level finite difference scheme is derived. The unique solvability, unconditional stability and second-order convergence inL∞-norm of the difference scheme are proved. One numerical example is presented to demonstrate the accuracy and efficiency of the proposed method.
Modified Ghost Fluid Method as Applied to Fluid-Plate Interaction
Authors: Xu Liang , Liu Tiegang 
Published: July 2016

AbstractThe modified ghost fluid method (MGFM) provides a robust and efficient interface treatment for various multi-medium flow simulations and some particular fluid-structure interaction (FSI) simulations. However, this methodology for one specific class of FSI problems, where the structure is plate, remains to be developed. This work is devoted to extending the MGFM to treat compressible fluid coupled with a thin elastic plate. In order to take into account the influence of simultaneous interaction at the interface, a fluid-plate coupling system is constructed at each time step and solved approximately to predict the interfacial states. Then, ghost fluid states and plate load can be defined by utilizing the obtained interfacial states. A type of acceleration strategy in the coupling process is presented to pursue higher efficiency. Several one-dimensional examples are used to highlight the utility of thismethod over looselycoupled method and validate the acceleration techniques. Especially, this method is applied to compute the underwater explosions (UNDEX) near thin elastic plates. Evolution of strong shock impacting on the thin elastic plate and dynamic response of the plate are investigated. Numerical results disclose that this methodology for treatment of the fluid-plate coupling indeed works conveniently and accurately for different structural flexibilities and is capable of efficiently simulating the processes of UNDEX with the employment of the acceleration strategy.
A Straightforward hp-Adaptivity Strategy for Shock-Capturing with High-Order Discontinuous Galerkin Methods
Authors: Lu Hongqiang , Sun Qiang 
Published: July 2016

AbstractIn this paper, high-order Discontinuous Galerkin (DG) method is used to solve the two-dimensional Euler equations. A shock-capturing method based on the artificial viscosity technique is employed to handle physical discontinuities. Numerical tests show that the shocks can be captured within one element even on very coarse grids. The thickness of the shocks is dominated by the local mesh size and the local order of the basis functions. In order to obtain better shock resolution, a straightforwardhp-adaptivity strategy is introduced, which is based on the high-order contribution calculated using hierarchical basis. Numerical results indicate that thehp-adaptivity method is easy to implement and better shock resolution can be obtained with smaller local mesh size and higher local order.
Fluid-Structure Interaction in Microchannel Using Lattice Boltzmann Method and Size-Dependent Beam Element
Authors: Esfahanian V. , Dehdashti E. , Dehrouyeh-Semnani A. M. 
Published: July 2016

AbstractFluid-structure interaction (FSI) problems in microchannels play prominent roles in many engineering applications. The present study is an effort towards the simulation of flow in microchannel considering FSI. Top boundary of the microchannel is assumed to be rigid and the bottom boundary, which is modeled as a Bernoulli-Euler beam, is simulated by size-dependent beam elements for finite element method (FEM) based on a modified couple stress theory. The lattice Boltzmann method (LBM) using D2Q13 LB model is coupled to the FEM in order to solve fluid part of FSI problem. In the present study, the governing equations are non-dimensionalized and the set of dimensionless groups is exhibited to show their effects on micro-beam displacement. The numerical results show that the displacements of the micro-beam predicted by the size-dependent beam element are smaller than those by the classical beam element.
Continuous and Discrete Adjoint Approach Based on Lattice Boltzmann Method in Aerodynamic Optimization Part I: Mathematical Derivation of Adjoint Lattice Boltzmann Equations
Authors: Hekmat Mohamad Hamed , Mirzaei Masoud 
Published: July 2016

AbstractThe significance of flow optimization utilizing the lattice Boltzmann (LB) method becomes obvious regarding its advantages as a novel flow field solution method compared to the other conventional computational fluid dynamics techniques. These unique characteristics of the LB method form the main idea of its application to optimization problems. In this research, for the first time, both continuous and discrete adjoint equations were extracted based on the LB method using a general procedure with low implementation cost. The proposed approach could be performed similarly for any optimization problem with the corresponding cost function and design variables vector. Moreover, this approach was not limited to flow fields and could be employed for steady as well as unsteady flows. Initially, the continuous and discrete adjoint LB equations and the cost function gradient vector were derived mathematically in detail using the continuous and discrete LB equations in space and time, respectively. Meanwhile, new adjoint concepts in lattice space were introduced. Finally, the analytical evaluation of the adjoint distribution functions and the cost function gradients was carried out.
Explicit Multi-Symplectic Splitting Methods for the Nonlinear Dirac Equation
Authors: Chen Yaming , Song Songhe , Zhu Huajun 
Published: July 2016

AbstractIn this paper, we propose two new explicit multi-symplectic splitting methods for the nonlinear Dirac (NLD) equation. Based on its multi-symplectic formulation, the NLD equation is split into one linear multi-symplectic system and one nonlinear infinite Hamiltonian system. Then multi-symplectic Fourier pseudospectral method and multi-symplectic Preissmann scheme are employed to discretize the linear subproblem, respectively. And the nonlinear subsystem is solved by a symplectic scheme. Finally, a composition method is applied to obtain the final schemes for the NLD equation. We find that the two proposed schemes preserve the total symplecticity and can be solved explicitly. Numerical experiments are presented to show the effectiveness of the proposed methods.
Asymptotic Analysis of a Bingham Fluid in a Thin Domain with Fourier and Tresca Boundary Conditions
Authors: Dilmi M. , Benseridi H. , Saadallah A. 
Published: July 2016

AbstractIn this paper we prove first the existence and uniqueness results for the weak solution, to the stationary equations for Bingham fluid in a three dimensional bounded domain with Fourier and Tresca boundary condition; then we study the asymptotic analysis when one dimension of the fluid domain tend to zero. The strong convergence of the velocity is proved, a specific Reynolds limit equation and the limit of Tresca free boundary conditions are obtained.
Discrete Maximum Principle Based on Repair Technique for Finite Element Scheme of Anisotropic Diffusion Problems
Authors: Chen Xingding , Yuan Guangwei , Yu Yunlong 
Published: July 2016

AbstractIn this paper, we construct a global repair technique for the finite element scheme of anisotropic diffusion equations to enforce the repaired solutions satisfying the discrete maximum principle. It is an extension of the existing local repair technique. Both of the repair techniques preserve the total energy and are easy to be implemented. The numerical experiments show that these repair techniques do not destroy the accuracy of the finite element scheme, and the computational cost of the global repair technique is cheaper than the local repair technique when the diffusion tensors are highly anisotropic.
Multiscale Basis Functions for Singular Perturbation on Adaptively Graded Meshes
Authors: Sun Mei-Ling , Jiang Shan 
Published: July 2016

AbstractWe apply the multiscale basis functions for the singularly perturbed reaction-diffusion problem on adaptively graded meshes, which can provide a good balance between the numerical accuracy and computational cost. The multiscale space is built through standard finite element basis functions enriched with multiscale basis functions. The multiscale basis functions have abilities to capture originally perturbed information in the local problem, as a result our method is capable of reducing the boundary layer errors remarkably on graded meshes, where the layer-adapted meshes are generated by a given parameter. Through numerical experiments we demonstrate that the multiscale method can acquire second order convergence in theL2norm and first order convergence in the energy norm on graded meshes, which is independent of ɛ. In contrast with the conventional methods, our method is much more accurate and effective.
A New Finite Volume Element Formulation for the Non-Stationary Navier-Stokes Equations
Authors: Luo Zhendong 
Published: July 2016

AbstractA semi-discrete scheme about time for the non-stationary Navier-Stokes equations is presented firstly, then a new fully discrete finite volume element (FVE) formulation based on macroelement is directly established from the semi-discrete scheme about time. And the error estimates for the fully discrete FVE solutions are derived by means of the technique of the standard finite element method. It is shown by numerical experiments that the numerical results are consistent with theoretical conclusions. Moreover, it is shown that the FVE method is feasible and efficient for finding the numerical solutions of the non-stationary Navier-Stokes equations and it is one of the most effective numerical methods among the FVE formulation, the finite element formulation, and the finite difference scheme.
An Inverse Problem of Determining Coefficients in a One-Dimensional Radiative Transport Equation
Authors: Higashimori Nobuyuki 
Published: July 2016

AbstractWe consider an inverse problem of determining unknown coefficients for a one-dimensional analogue of radiative transport equation. We show that some combination of the unknown coefficients can be uniquely determined by giving pulse-like inputs at the boundary and observing the corresponding outputs. Our result can be applied for determination of absorption and scattering properties of an optically turbid medium if the radiative transport equation is appropriate for describing the propagation of light in the medium.
Why did the storm ex-Gaston (2010) fail to redevelop during the PREDICT experiment?
Authors: Freismuth Thomas M. , Rutherford Blake , Boothe Mark A. , Montgomery Michael T. 
Published: July 2016

Abstract. An analysis is presented of the failed re-development of ex-Gaston during the 2010 PREDICT field campaign based on the European Centre for Medium Range Weather Forecast (ECMWF) analyses. We analyze the dynamics and kinematics of ex-Gaston to investigate the role of dry, environmental air in the failed redevelopment. The flow topology defined by the calculation of particle trajectories shows that ex-Gaston's pouch was vulnerable to dry, environmental air on all days of observations. As early as 12:00 UTC 2 September 2010, a dry layer at and above 600 hPa results in a decrease in the vertical mass flux and vertical relative vorticity. These findings support the hypothesis that entrained, dry air near 600 hPa thwarted convective updraughts and vertical mass flux, which in turn led to a reduction in vorticity and a compromised pouch at these middle levels. A compromised pouch allows further intrusion of dry air and quenching of subsequent convection, therefore hindering vorticity amplification through vortex tube stretching. This study supports recent work investigating the role of dry air in moist convection during tropical cyclogenesis.
ELEMENTOS PARA UMA HISTÓRIA DAS RESISTÊNCIAS À PERÍCIA CRIMINAL: O CASO BAMBINO MARCHI, ROMA, 1925
Authors: Artières Philippe 
Published: July 2016

A partir do estudo de um caso, o assassinato do jesuíta Paul Gény pelo soldado italiano Bambino Marchi, em 1925, o artigo pretende mostrar como uma escrita de cunho autobiográfico, o breve relato do crime escrito pelo próprio assassino, pode ser lida como uma forma de insurgência contra os discursos policiais e, principalmente, médico. Mais que mero exercício memorialístico, tal narrativa é uma verdadeira tomada de palavra contra a autoridade do perito.
PEDRO HESPANHOL: UM BANDIDO CÉLEBRE NO IMPÉRIO BRASILEIRO
Authors: Porto Ana Gomes 
Published: July 2016

Análise das representações de Pedro Hespanhol, que começaram a circular na imprensa brasileira em meados da década de 1830, estendendo-se até o século XX. O artigo indagará os motivos que fizeram com que Pedro Hespanhol, considerado um criminoso “sanguinário”, se transformasse em uma espécie de herói, sendo, inclusive, personagem de duas narrativas ficcionais.
UMA LEITURA DA GREVE DA FORÇA PÚBLICA DE SÃO PAULO (13 E 14 DE JANEIRO DE 1961) – ENTRE O CORPORATIVISMO E A POLÍTICA
Authors: Rosemberg André 
Published: July 2016

Em janeiro de 1961, os policiais da Força Pública de São Paulo entraram em greve durante dois dias. O ato dramático, em que foi tomado o quartel do Corpo de Bombeiros no centro da capital, e paralisado o serviço em outras companhias, reivindicava aumento salarial e paridade de vencimentos com o quadro do funcionalismo civil. Ainda que inicialmente as demandas dos grevistas fossem de ordem corporativa e profissional, havia um forte aspecto político na paralisação. O evento paredista não pode ser tomado como um ato isolado: ele está plenamente embebido no contexto político-social dos anos que precederam o golpe de 1964.
Controle e reposição de componentes críticos em uma emprensa de montagem de placas eletrônicas
Authors: Dos Santos Edernice , Da Cunha Tamy Cordeiro , Souza Alessandra Gomes 
Published: July 2016

Este artigo apresenta um estudo desenvolvido em uma montadora de placas eletrônicas. Para esse estudo foi analisado o fluxo de informações entre o setor comercial, setor de compras e o setor de Planejamento e Controle de Produção. As informações analisadas dizem respeito ao componente Relê 822, o qual é um item denominado “crítico”, pois existe apenas um fabricante deste componente no mundo. O Relê 822 faz parte da estrutura do produto “Placa de Bloqueio Progressivo”. O objetivo do estudo é auxiliar na tomada decisão sobre a reposição deste componente, buscando reduzir os custos e garantindo que o componente esteja na fábrica em tempo hábil para a produção e entrega dos pedidos. O estudo realizado revela a necessidade de planejar a reposição do Relê 822 de forma semestral, buscando eliminar problemas relacionados com a falta do componente no mercado, o que poderá aumentar seu custo unitário e de transporte. O fluxo de informações sobre este componente será imprescindível para manter um relacionamento direto e transparente com o cliente, podendo ocorrer à confirmação de datas de entrega e, quando necessário, a negociação de novos prazos em tempo hábil.
Understanding Literary Diatexts: Approaching the Archive of Richmal Crompton, the Creator of ‘Just William’ Stories
Authors: McVeigh Jane 
Published: July 2016

Richmal Crompton was born in Bury, Lancashire on 15 November 1890 and she wrote and published ‘Just William’ stories from 1919. She was very prolific, and published thirty-eight ‘Just William’ story collections, some forty novels and other short story collections. She is most famous for her stories about an eleven year old boy called William who features in the ‘Just William’ stories. Crompton often wrote ideas on fragments of paper. Her archive at the University of Roehampton also includes letters and other documents from fans, friends, family, local organisations and businesses which have, on the other side, ideas for her stories. The archive houses Crompton’s library taken by her family from her last home. Personal notes and postcards from friends were found inside these books. Moreover, the archive includes other personal items, such as her desk, typewriter and glasses. This essay will consider how we can understand the archive of the author, Richmal Crompton, based on a diatextual analysis that draws connections across the fluid boundaries that all of this material creates within this physical and imaginative space. This article was submitted to the European Journal of Life Writing on October 1st 2015 and published on 22 June 2016.
Health problems of young people in the municipality of Foca / Zdravlje i problemi mladih u opštini Foča
Authors: Kucurski Ljubiša , Hadživuković Natalija , Joković Sandra , Pavlović Jelena 
Published: July 2016

Young people, according to UN defiiniciji, represent the future of every society and they are the most profitable long-term investmentEach year, approximately 1 million teenage girls become pregnant in the world, and every 67 seconds a baby teenager In the adolescent period a large number of young people start with alcohol, coffee, psychotropic substances and smoking. The reasons are most often the desire to prove, identification, affirmation sekusalnog identity, curiosity for the new and unknown. The aim of the study was to examine the knowledge, attitudes and knowledge of adolescents about the use of psychoactive substances, alcohol and tobacco, as well as to identify ways in which young people use their free time. The survey was conducted in April 2015, in primary and Secondary School in Foca. The survey included 212 respondents, of different genders and different age groups. Data were collected original survey questionnaire, anonymous character, which contains 14 questions.Both groups of patients in a large percentage stated that they did not try psychoactive substances, as the most common reason for drug use both cited as the main reason for the influence of society. Although sexual activity is still taboo in the RS, alarming data that 19% of ninth grade students sexually active, and to limit entry into sexual relations increasingly lowered.Young in primary and secondary school state that they are sufficiently informed of psychoactive substances, as the most frequent source of information for high school state TV and the Internet, and ninth grade students report that they are parents. In this time of adventure and immature display of defiance social and social norms, young people are very vulnerable group subject to acceptance of various forms of risk behavior.
Effect of N2 microplasma treatment on initial growth of GaN by metal–organic molecular beam epitaxy
Authors: Suzuki Yohei , Kusakabe Yasuhiro , Uchiyama Shota , Maruyama Takahiro , Naritsuka Shigeya , Shimizu Kazuo 
Published: July 2016

Abstract
N2 atmospheric microplasma was applied to improve the yields and reproducibility of the initial growth of GaN by metal–organic molecular beam epitaxy (MOMBE). The plasma treatment was found to be effective in cleaning the surface, and excellent flat growth was achieved even in the early stage of the growth. The effect of the air exposure after plasma treatment was also studied, and the yield of the growth was found to be largely decreased by the air exposure even after the treatment. Therefore, the oxidation of the substrate is one of main causes of the poor initial growth and the installation of the microplasma equipment in the MBE loading chamber is useful for suppressing the oxidation after the treatment. Atomic force microscopy (AFM) measurement shows that the microplasma treatment is also effective for undoing the surface double steps through etching, which is helpful for a very smooth layer-by-layer growth in the early stage of growth.
Analysis of energy states of two-dimensional electron gas in pseudomorphically strained InSb high-electron-mobility transistors taking into account the nonparabolicity of the conduction band
Authors: Nishio Yui , Sato Takato , Hirayama Naomi , Iida Tsutomu , Takanashi Yoshifumi 
Published: July 2016

Abstract
We propose a high electron mobility transistor with a pseudomorphically strained InSb channel (InSb-PHEMT) having an InSb composite channel layer in which the Al
y
In1−

y
Sb sub-channel layer is inserted between the InSb channel and the Al
x
In1−

x
Sb barrier layers to increase the conduction-band offset (ΔE
C) at the heterointerface between the InSb channel and the Al
x
In1−

x
Sb barrier layers. The energy states for the proposed InSb-PHEMTs are calculated using our analytical method, taking account of the nonparabolicity of the conduction band. For the proposed InSb-PHEMTs, putting the sub-channel layers into the channel is found to be effective for obtaining a sufficiently large ΔE
C (∼0.563 eV) to restrain electrons in the channel and increase the sheet concentration of two-dimensional electron gas to as high as 2.5 × 1012 cm−2, which is comparable to that of InAs-PHEMTs. This also leads to a large transconductance of PHEMTs. In the proposed InSb-PHEMTs, electrons are strongly bound to the channel layer compared with InAs-PHEMTs, despite the effective mass at the conduction band (0.0139 m
0) of InSb being smaller than that of InAs and ΔE
C for the InSb-PHEMTs being 25% smaller than that for the InAs-PHEMTs. This is because the bandgap energy of InSb is about one-half that of InAs, and hence, the nonparabolicity parameter of InSb is about twice as large as that of InAs.
Spatial variation in local work function as an origin of moiré contrast in scanning tunneling microscopy images of Pb thin films/Si(111)
Authors: Kim Howon , Hasegawa Yukio 
Published: July 2016

Abstract
By scanning tunneling microscopy (STM), we measured an evolution of electrical conductance from the tunneling to point contact regimes on Pb thin films formed on a Si(111) substrate. Immediately before the contact formation, the conductance evolution curves exhibit an onset of the conductance that is presumably due to a short-range chemical interaction between the tip apex atom and surface atom(s), and we found that the onset can be utilized as a reference of the tip–sample distance. By measuring the spatial variation in onset distance, we investigated surface atomic corrugation in moiré-corrugated areas and found that the geometrical corrugation is negligibly small (less than 2 pm) on the surfaces of 7-monolayer Pb thin films. We also observed a local variation in apparent barrier height depending on the moiré contrast in the tunneling regime, which leads us to conclude that the spatial variation in local work function is the origin of the moiré corrugation observed in STM images.
Simultaneous observation of two dimensional electron gas and polarization in AlGaN/GaN heterostructure using scanning nonlinear dielectric microscopy
Authors: Hirose Kotaro , Goto Yasunori , Chinone Norimichi , Cho Yasuo 
Published: July 2016

Abstract
The AlGaN/GaN heterostructure has two-dimensional electron gas (2DEG) and electric polarization. We observed both of them simultaneously in the cross section of the AlGaN/GaN heterostructure by scanning nonlinear dielectric microscopy (SNDM), which can visualize both carrier and polarization distributions. The AlGaN/GaN heterostructure was cross-sectioned at an angle of 20° from the [0001] axis and, hence, the perpendicular components of the polarizations of AlGaN and GaN were observed. Moreover, the 2DEG distribution was confirmed in a range of ∼10 nm at the AlGaN/GaN interface.