bluuebunny/crossref_metadata_2025_split huggingface dataset:
Enhancing micro-electromechanical and tuning optical properties in Nd-doped BIT thin film
Authors: Zhang Yunjie , Chen Changle , Wang Jing , Luo Bingcheng , Duan Mengmeng , Jin Kexin 
Published: March 2016

Bi4Ti3O[Formula: see text] (BIT) and Bi[Formula: see text]Nd[Formula: see text]Ti3O[Formula: see text] (BNT) thin films were deposited on Pt/Ti/SiO2/Si (100) substrates using pulsed laser deposition. The surface morphologies, ferroelectric domain structures and polarization switching were investigated by atomic force microscopy (AFM) and piezoelectric force microscopy (PFM). The phase and amplitude images of PFM show that the BIT and BNT thin films have clear domain structures. Comparison of the surface morphologies and domain structures indicates that the grain boundaries limit the shape of domain and affect the domain structure. The micro-electromechanical performance was characterized by the effective piezoelectric coefficient [Formula: see text] of the thin films. The result shows that the maximum effective [Formula: see text] value (100 pm/V) of BNT thin film is larger than that of BIT thin film (30 pm/V). This can be ascribed to BNT thin film with a preferred growth direction of [Formula: see text]-axis, resulting in effective enhancement of [Formula: see text]. Besides, all the thin films exhibit good optical transmittance in the range of 500–800 nm and the optical band gaps increase from 3.43 eV to 3.52 eV due to Nd doping.
Opportunistic Spinlocks
Authors: Kashyap Sanidhya , Min Changwoo , Kim Taesoo 
Published: March 2016

With increasing demand for big-data processing and faster in-memory databases, cloud providers are moving towards large virtualized instances besides focusing on the horizontal scalability.
However, our experiments reveal that such instances in popular cloud services (e.g., 32 vCPUs with 208 GB supported by Google Compute Engine) do not achieve the desired scalability with increasing core count even with a simple, embarrassingly parallel job (e.g., Linux kernel compile). On a serious note, the internal synchronization scheme (e.g., paravirtualized ticket spinlock) of the virtualized instance on a machine with higher core count (e.g., 80-core) dramatically degrades its overall performance. Our finding is different from the previously well-known scalability problem (i.e., lock contention problem) and occurs because of the sophisticated optimization techniques implemented in the hypervisor---what we call sleepy spinlock anomaly. To solve this problem, we design and implement OTICKET, a variant of paravirtualized ticket spinlock that effectively scales the virtualized instances in both undersubscribed and oversubscribed environments.
Reduction of Sulfoxides with Ascorbic Acid Catalyzed by NBS
Authors: Abbasi Mohammad , Mohammadizadeh Mohammad Reza , Moradi Zahra 
Published: March 2016

Abstract
An efficient procedure to reduce sulfoxides using ascorbic acid has been developed. Using this procedure structurally diverse sulfoxides were reduced by treating with ascorbic acid in the presence of a catalytic amount of N-bromosuccinimide (NBS) at room temperature in high yields.
Scope and Limitations of Supramolecular Autoregulation
Authors: Teunissen Abraham J P , van der Haas Roy J C , Vekemans Jef A J M , Palmans Anja R A , Meijer E W 
Published: March 2016

Abstract
Recently, our group has reported on the ureidopyrimidinone (UPy) induced buffering of 2,7-diamido-1,8-naphthyridine (NaPy) and used this phenomenon to regulate the catalysis of the Michael addition of 2,4-pentanedione to trans-β-nitrostyrene. We now show that the observed catalytic activity of NaPy is the result of a strong synergy between NaPy and trace amounts of K2CO3, resulting in a more than 100-fold increase in reaction rate compared to the two compounds separately. By keeping the concentration of K2CO3, as well as NaPy, constant, an improved regulation of the catalytic activity is achieved. We show that the catalytic activity can be precisely regulated in a noncovalent manner via the addition of the UPy motif. Finally, different salts and Michael substrates are screened to assess the selectivity of this catalytic couple and to provide a platform for future research in molecular buffering, regulation, and chemical networks.
Computer Simulation of Kinematic Surfaces
Authors: Усманова  , Usmanova E. , Короткий  , Korotkiy Viktor , Хмарова  , Khmarova Lyudmila 
Published: March 2016

A geometric surface model is formed taking into account
given functional, structural, technological, economic, aesthetic
requirements. These requirements are formulated in geometric
terms and are expressed in terms of the surface parameters. The
surface is modeled either Kinematics manner, or by way of a twodimensional
interpolation. In accordance with in accordance with
the kinematic method, the surface is formed as a continuous oneparameter
many curves that form simulated in the surface. In accordance
with the interpolation method, the surface consists of a
set of elementary two-dimensional fragments. The article considered
cinema optical method based on the use of curves of the second
order of change-nests of the eccentricity as the main shaping element.
To control the shape of the design surfaces are used for guide
ruled surfaces (cilindroidy and conoid). Computer program is
compiled, which determines the eccentricity of the forming curves
of the second order depending on the boundary conditions. The
program allows you to plot curve of the second order, given an
arbitrary set of five coplanar points and tangents. When modeling
the surface of the passing through a closed circuit, is used the mapping
of this contour in four-dimensional space. Such mapping gives
more possibilities for control surface shape. It is shown that the
kinematics method computer simulation of the surface has technological
advantages properties instead of interpolation method.
Service Provisioning Problem in Cloud and Multi-Cloud Systems
Authors: Passacantando Mauro , Ardagna Danilo , Savi Anna 
Published: March 2016

Cloud computing is a new emerging paradigm that aims to streamline the on-demand provisioning of resources as services, providing end users with flexible and scalable services accessible through the Internet on a pay-per-use basis. Because modern cloud systems operate in an open and dynamic world characterized by continuous changes, the development of efficient resource provisioning policies for cloud-based services becomes increasingly challenging. This paper aims to study the hourly basis service provisioning problem through a generalized Nash game model. We take the perspective of Software as a Service (SaaS) providers that want to minimize the costs associated with the virtual machine instances allocated in a multiple Infrastructures as a Service (IaaS) scenario while avoiding incurring penalties for execution failures and providing quality of service guarantees. SaaS providers compete and bid for the use of infrastructural resources, whereas the IaaSs want to maximize their revenues obtained providing virtualized resources. We propose a solution algorithm based on the best-reply dynamics, which is suitable for a distributed implementation. We demonstrate the effectiveness of our approach by performing numerical tests, considering multiple workloads and system configurations. Results show that our algorithm is scalable and provides significant cost savings with respect to alternative methods (5% on average but up to 260% for individual SaaS providers). Furthermore, varying the number of IaaS providers means an 8%–15% cost savings can be achieved from the workload distribution on multiple IaaSs.
Do Preference Reversals Disappear When We Allow for Probabilistic Choice?
Authors: Loomes Graham , Pogrebna Ganna 
Published: March 2016

The “preference reversal phenomenon,” a systematic disparity between people’s valuations and choices, poses challenges for theory and policy. Using a very general formulation of probabilistic preferences, we show that the phenomenon is not mainly due to intransitive choice. We find a high degree of regularity within choice tasks and also within valuation tasks, but the two types of tasks appear to evoke very different cognitive processes, even when the experimental environment tries to minimise differences. We discuss possible implications for modelling and eliciting preferences. Data, as supplemental material, are available at http://dx.doi.org/10.1287/mnsc.2015.2333 . This paper was accepted by Manel Baucells, decision analysis.
Integration of Programmed Instruction into Mathematics and Science Teaching: A Panacea to Students Dwindling Interest in Mathematics and Science in Nigerian Schools
Authors: Oginni Omoniyi Israel , Owolabi Olabode Thomas 
Published: March 2016

<p style="text-align:justify">This study examined Programmed Instruction (PI) a panacea to students’ dwindling interest in mathematics. Descriptive research of survey design was adopted for the study. A questionnaire was designed to collect data from a sample of seven hundred and fifty (750) respondents which include 700 Students and 50 Teachers from Public and Private Secondary Schools in Ado-Ekiti Local Government Area of Ekiti State in Nigeria. The study revealed that usage of programmed instruction beef up curiosity in mathematics students and resulted to greater retention and mastery of subject matter. Also, the study revealed that lack of trained personnel to help guide students in the use of programmed books, scarcity of programmed books in the society, high cost of procuring programmed books and machine and lack of necessary infrastructural facilities have been the factors militating against the implementation of programmed instruction in schools. Based on the findings, it was recommended that curriculum experts should develop various using the programmed instruction approach. Government should release fund for the development of programmed books and school authority should encourage their teachers to attend seminars and workshops, were they could gain knowledge of how to implement programmed instruction and other pedagogical skills that will enhance the teaching and learning of mathematics. Also, there should be provision of necessary infrastructural facilities in schools for easy implementation of programmed instruction.</p>
Heat Transfer Characteristics during Superheated Steam Vacuum Drying of Poplar
Authors: He Zhengbin , Qiu Shu , Zhang Yu , Zhao Zijian , Yi Songlin 
Published: March 2016

Abstract
Superheated steam vacuum drying shows major advantages in terms of reducing the boiling point of water and speeding up the drying process, but to our knowledge, no researcher has addressed the effects of drying conditions on heat transfer characteristics during superheated steam vacuum drying of wood. In this study, we did so using fast-growing poplar. Temperatures inside the wood were measured and the convective heat transfer coefficients calculated under temperature conditions of 35°C, 55°C, and 70°C and absolute pressures of 0.03, 0.06, and 0.1 MPa. The results of our subsequent analysis showed that the ultimate temperatures inside wood increase alongside increasing absolute pressure at the set temperature conditions and are lower than that of the drying medium. In addition, we found that convective heat transfer coefficients increase as absolute pressure increases at the set temperatures and also increase as temperature increases at set absolute pressure conditions. We then established a convective heat transfer coefficient model based on the experimental results. The findings presented here may provide theoretical guidance for maximizing the available advantages of superheated steam vacuum drying and choosing appropriate drying schedules for poplar in future applications.
Compactness of Minimizing Sequences in Nonlinear Schrödinger Systems Under Multiconstraint Conditions
Authors: Ikoma Norihisa 
Published: March 2016

Abstract
In this paper, the precompactness of minimizing sequences under multiconstraint conditions are discussed. This minimizing problem is related to a coupled nonlinear Schrödinger system which appears in the field of nonlinear optics. As a consequence of the compactness of each minimizing sequence, the orbital stability of the set of all minimizers is obtained.
Existence and Asymptotic Behavior for Solutions to Boundary Blow-up Elliptic Problems
Authors: Rhouma N. Belhaj , Drissi A. 
Published: March 2016

Abstract
This paper deals with the existence of solutions to the elliptic equation Δu = k(x) f (u) in D satisfying the boundary blow-up condition u|∂D = ∞, where D ⊂ ℝN is an open bounded domain with smooth boundary ∂D. Under suitable assumptions on k and f , we show the existence of at least one solution u. Under additional hypotheses on k, we give asymptotic estimate for u near the boundary.
Positive Solutions for BVPs with One-dimensional Mean Curvature Operator
Authors: Ó João Marcos do , Orpel Aleksandra 
Published: March 2016

Abstract
We discuss the existence and properties of solutions for systems of Dirichlet problems involving one dimensional mean curvature operator. Our approach is based on variational methods and covers both sublinear and superlinear cases of nonlinearities. We also investigate the continuous (in some sense) dependence of solutions on functional parameters.
The Dirichlet Problem with Mean Curvature Operator in Minkowski Space – a Variational Approach
Authors: Bereanu C. , Jebelean P. , Mawhin J. 
Published: March 2016

Abstract
In this paper we consider the Dirichlet problem with mean curvature operator in Minkowski space :

where Ω ⊂ ℝN is a smooth open bounded set and f : Ω × ℝ → ℝ is a Carathéodory function. We show that u is a solution of the above problem iff it is a critical point of the corresponding non-smooth action functional. Applications concerning nontrivial solutions for a class of such Dirichet problems depending on a parameter are provided.
Existence of Strictly Positive Solutions for Sublinear Elliptic Problems in Bounded Domains
Authors: Godoy T. , Kaufmann U. 
Published: March 2016

Abstract
Let Ω be a smooth bounded domain in RN and let m be a possibly discontinuous and unbounded function that changes sign in Ω. Let f : [0,∞) → [0,∞) be a nondecreasing continuous function such that k1ξp ≤ f (ξ) ≤ k2ξp for all ξ ≥ 0 and some k1, k2 > 0 and p ∈ (0, 1). We study existence and nonexistence of strictly positive solutions for nonlinear elliptic problems of the form −Δu = m(x) f (u) in Ω, u = 0 on ∂Ω.
Complete Orbits for Twist Maps with Exponential Generating Functions
Authors: Liu Qihuai , Guo Yishuang , Tang Hongwu 
Published: March 2016

Abstract
In this paper twist symplectic maps with non-periodicity are considered, where the associated generating functions grow exponentially. Under appropriate assumptions the existence of infinitely many bounded complete orbits is established. An application to Toda-like type lattices may help us to explain our results.
Topological Methods for Boundary Mean Curvature Problem on Bn
Authors: Al-Ghamdi Mohammed Ali , Chtioui Hichem , Sharaf Khadijah 
Published: March 2016

Abstract
Using an algebraic topological method and the tools of the theory of the critical points at infinity, we provide a variety of classes of functions that can be realized as the mean curvature on the boundary of the the n-dimensional balls.
A Multiplicity Theorem for p-Superlinear Neumann Problems with a Nonhomogeneous Differential Operator
Authors: Barletta Giuseppina , Papageorgiou Nikolaos S. 
Published: March 2016

Abstract
We consider a nonlinear Neumann problem driven by a nonhomogeneous differential operator (special case is the p-Laplacian) with a (p − 1)-superlinear Carathéodory reaction term, which need not satisfy the usual in such cases Ambrosetti-Rabinowitz condition. Using variational methods based on the critical point theory coupled with suitable truncation techniques, we show that the problem has at least five nontrivial smooth solutions.
Existence of a Ground State Solution for a Quasilinear Schrödinger Equation
Authors: Fang Xiang-dong , Han Zhi-qing 
Published: March 2016

Abstract
In this paper we are concerned with the quasilinear Schrödinger equation
−Δu + V(x)u − Δ(u2)u = q(x)|u|p−2u, x ∈ ℝN,
where N ≥ 3, 4 < p < 4N/(N − 2), and V(x) and q(x) go to some positive limits V∞ and q∞ respectively as |x| → ∞. Under a weak one-sided asymptotic estimate for V(x) and q(x) at infinity, we obtain the existence of a ground state solution.
The limiting Behavior of Solutions to Inhomogeneous Eigenvalue Problems in Orlicz-Sobolev Spaces
Authors: Bocea Marian , Mihăilescu Mihai , Stancu-Dumitru Denisa 
Published: March 2016

Abstract
The asymptotic behavior of the sequence {un} of positive first eigenfunctions for a class of inhomogeneous eigenvalue problems is studied in the setting of Orlicz-Sobolev spaces. After possibly extracting a subsequence, we prove that un → u∞ uniformly in Ω as n→∞, where u∞ is a nontrivial viscosity solution of a nonlinear PDE involving the ∞-Laplacian.
On the Existence of Boundary Blow-up Solutions for a General Class of Quasilinear Elliptic Systems
Authors: Ben Othman Sonia , Chemmam Rym , Sauvy Paul 
Published: March 2016

Abstract
In this paper, we investigate the following quasilinear elliptic system (P) with explosive boundary conditions:
Δpu = f1(x, u, v) in Ω; u|∂Ω = +∞, u >0 in Ω,
Δqv = f2(x, u, v) in Ω; v|∂Ω = +∞, v >0 in Ω,
where Ω is a smooth bounded domain of ℝN, N ≥ 2, 1 < p, q < +∞ and f1, f2 are two Carathéodory functions in Ω × (ℝ+* × ∗ ℝ+*). Under rather general conditions on f1 and f2 and assuming the existence of a sub and supersolutions pair, we prove the existence of a large solution to (P) by a fixed point approach. Then, we apply this result considering particular systems arising in Biology.
Least Energy Solutions for Nonlinear Schrödinger Systems with Mixed Attractive and Repulsive Couplings
Authors: Sato Yohei , Wang Zhi-Qiang 
Published: March 2016

Abstract
In this paper we study the ground state solutions for a nonlinear elliptic system of three equations which comes from models in Bose-Einstein condensates. Comparing with existing works in the literature which have been on purely attractive or purely repulsive cases, our investigation focuses on the effect of mixed interaction of attractive and repulsive couplings. We establish the existence of least energy positive solutions and study asymptotic profile of the ground state solutions, giving indication of co-existence of synchronization and segregation. In particular we show symmetry breaking for the ground state solutions.
On the Brezis-Nirenberg Problem with a Kirchhoff Type Perturbation
Authors: Naimen Daisuke 
Published: March 2016

Abstract
In this paper, we investigate a Kirchhoff type elliptic problem,

where Ω ⊂ ℝ3 is an open ball, λ ∈ ℝ and b ≥ 0. We give an extension of the result by Brezis-Nirenberg in 1983 to the case b > 0. In particular, we can observe several effects of the nonlocal coefficient on the well known results related to the existence, nonexistence and uniqueness.
The Mean Curvature Equation with Oscillating Nonlinearity
Authors: Araujo Anderson L. A. de , Montenegro Marcelo 
Published: March 2016

Abstract
We find a solution of the Dirichlet problem for the prescribed mean curvature equation in Ω with u = 0 on ∂Ω, where Ω is a smooth bounded domain in ℝN, N ≥ 1 and f : Ω × [0,∞) → ℝ is an unbounded continuous function with oscillatory behavior near the origin.
Convergence of Extremals of Variational Problems on Large Intervals
Authors: Zaslavski Alexander J. 
Published: March 2016

Abstract
We study the structure of approximate solutions of autonomous variational problems on large finite intervals. In our previous research we showed that approximate solutions are determined mainly by the integrand, and are essentially independent of the choice of time interval and data, except in regions close to the endpoints of the time interval. In the present paper we study the convergence of approximate solutions to solutions of the corresponding infinite horizon problems, in regions close to the endpoints of the time intervals.
Elliptic Systems of Schrödinger Type in the Spirit of Benci-Fortunato
Authors: Boccardo Lucio 
Published: March 2016

Abstract
We study the existence of solutions of elliptic systems of the type

and we examine how the structure of the system gives rise to a regularizing effect on the summability of the solutions; following the theory of elliptic (single) equations, the regularizing effect is unexpected.
Multiplicity Results for an Anisotropic Equation with Subcritical or Critical Growth
Authors: Figueiredo Giovany , Santos Júnior João R. , Suárez Antonio 
Published: March 2016

Abstract
In this work we show some multiplicity results for the anisotropic equation

where Ω ⊂ℝN is a bounded smooth domain, 1 < p1 ≤ p2 ≤ . . . ≤ pN and λ is a positive parameter. Using genus theory, we study the subcritical case gλ(u) = λ|u|q−2u with q ∈ (1, pN) and the critical case gλ(u) = λ|u|q−2u +|u|p*−2u with q ∈ (1, p1) and p* = N| p̅/(N−p̅), with p̅ the harmonic mean of the pi’s.
Extremal, Nodal and Stable Solutions for Nonlinear Elliptic Equations
Authors: Gasiński Leszek , Papageorgiou Nikolaos S. 
Published: March 2016

AbstractWe consider Dirichlet p-Laplacian equations which may be resonant with respect to the principal eigenvalue at ±∞. We show the existence of extremal nontrivial constant sign solutions and of nodal solutions. In the semilinear case (p = 2) we produce additional nodal solutions. We show that certain parametric equations (eigenvalue problems) studied in the past, are a special case of our multiplicity theorem. Finally, we establish the stability of the extremal solutions.
Modeling the Hot Tensile Flow Behaviors at Ultra-High-Strength Steel and Construction of Three-Dimensional Continuous Interaction Space for Forming Parameters
Authors: Quan Guo-zheng , Zhan Zong-yang , Wang Tong , Xia Yu-feng 
Published: March 2016

Abstract
The response of true stress to strain rate, temperature and strain is a complex three-dimensional (3D) issue, and the accurate description of such constitutive relationships significantly contributes to the optimum process design. To obtain the true stress–strain data of ultra-high-strength steel, BR1500HS, a series of isothermal hot tensile tests were conducted in a wide temperature range of 973–1,123 K and a strain rate range of 0.01–10 s−1 on a Gleeble 3800 testing machine. Then the constitutive relationships were modeled by an optimally constructed and well-trained backpropagation artificial neural network (BP-ANN). The evaluation of BP-ANN model revealed that it has admirable performance in characterizing and predicting the flow behaviors of BR1500HS. A comparison on improved Arrhenius-type constitutive equation and BP-ANN model shows that the latter has higher accuracy. Consequently, the developed BP-ANN model was used to predict abundant stress–strain data beyond the limited experimental conditions. Then a 3D continuous interaction space for temperature, strain rate, strain and stress was constructed based on these predicted data. The developed 3D continuous interaction space for hot working parameters contributes to fully revealing the intrinsic relationships of BR1500HS steel.