bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterize on the Heisenberg group with left invariant Lorentzian metric
Authors: Turhan Essin , Körpinar Talat
Published: May 2017

In this paper, we consider the biharmonicity conditions for maps between Riemannian manifolds and we characterize non-geodesic biharmonic curve in Heisenberg group
On some partitions where even parts do not repeat
Authors: Patkowski Alexander E.
Published: May 2017

We offer some new results on some partition functions in which even parts do not repeat. In particular, we show certain partition functions in this category are lacunary.
Contributions to the Erdős’ conjecture on arithmetic progressions
Authors: Wituła Roman , Słota Damian
Published: May 2017

The most famous unsolved is Erdős’ conjecture that every set
Cyclic entropic quasigroups
Authors: Bińczak Grzegorz , Kaleta Joanna
Published: May 2017

In this paper we explain the relationship of some entropic quasigroups to abelian groups with involution. It is known that (
Several extended analogues of Hilbert’s inequalities
Authors: Du Hongxia , Miao Yu
Published: May 2017

By introducing the function
Approximation of common random fixed point for a finite family of non-self asymptotically nonexpansive random mappings
Authors: Saluja G. S.
Published: May 2017

In this paper, we study multi-step random iteration scheme with errors for a common random fixed point of a finite family of nonself asymptotically nonexpansive random mappings in real uniformly convex separable Banach spaces. The results presented in this paper extend the recent ones announced by Zhou and Wang [
The product of generalized polynomials sets pertaining to a class of convolution integral equations
Authors: Chaurasia V. B. L. , Agnihotri Mukesh
Published: May 2017

The purpose of this paper is to obtain a certain class of convolution integral equation of Fredholm type with the product of two generalized polynomials sets. Using of the Mellin transform technique; we have established solution of the integral equation.
Bounded solutions of a generalized Gołąb–Schinzel equation
Authors: Jabłońska Eliza
Published: May 2017

Let
Common fixed point and best approximation for Banach operator pairs in non-starshaped domain
Authors: Nashine Hemant Kumar
Published: May 2017

Common fixed point results for Banach operator pair with generalized nonexpansive mappings in non-starshaped domain of metric space have been obtained in the present work. As application, more general best approximation results in normed space have also been determined. These results extend and generalize various existing known results with the aid of Banach operator pair and without starshaped condition of domain.
A common fixed point theorem in non-Archimedean menger PM-spaces
Authors: Kutukcu Servet , Sharma Sushil
Published: May 2017

In the present work, we introduce two types of compatible maps in non-Archimedean Menger PM-spaces and obtain a common fixed point theorem for six maps.
On almost pseudo conformally symmetric manifolds
Authors: De Uday Chand , Gazi Abul Kalam
Published: May 2017

The object of the present paper is to study a type of non-conformally flat semi-Riemannian manifolds called almost pseudo conformally symmetric manifold. The existence of an almost pseudo conformally symmetric manifold is also shown by a non-trivial example.
Expectation in metric spaces and characterizations of Banach spaces
Authors: Bator Artur , Zięba Wiesław
Published: May 2017

We consider different definitions of expectation of random elements taking values in metric spaces. All such definitions are valid also in Banach spaces and in this case the results coincide with the Bochner integral. There may exist an isometry between considered metric space and some Banach space and in this case one can use the Bochner integral instead of expectation in metric space. We give some conditions which ensure existence of such isometry, for two different definitions of expectation in metric space.
An embedding theorem for unbounded convex sets in a Banach space
Authors: Bielawski Jakub , Tabor Jacek
Published: May 2017

Let
Matrix interval monotonicity
Authors: Jayaraman Sachindranath , Sivakumar K. C.
Published: May 2017

We propose new notions of monotonicity for real matrices in order to characterize a particular notion of interval boundedness of various generalized inverses.
Certain spaces of sequences of fuzzy numbers defined by a modulus function
Authors: Talo Özer , Başar Feyzi
Published: May 2017

The main purpose of the present paper is to introduce the spaces
Fixed point and homotopy results for generalized contractions on spaces with two metrics
Authors: Kiran Quanita , Kamran Tayyab
Published: May 2017

In this paper, we establish fixed point and homotopic results for generalized contractions on spaces with two metrics. Our results generalize and extend the results of Agarwal and O’Regan [R. P. Agarwal, Donal O’Regan, Fixed point theory for generalized contractions on spaces with two metrics, J. Math. Anal. Appl. 248 (2000), 402–414] and those contain therein.
Quasi-simplicity of some homeomorphism and diffeomorphism groups
Authors: Kowalik Agnieszka , Michalik Ilona
Published: May 2017

The notion of quasi-simplicity of groups is introduced. It is proven that for a group of homeomorphisms
On density with respect to equivalent measures
Authors: Bartoszewicz Artur , Filipczak Małgorzata , Poreda Tadeusz
Published: May 2017

In the paper there is disscussed a notion of a density point of a Borel subset of a metric space with respect to a Borel measure
Solutions of some functional equations related to the determinant of certain matrices
Authors: Akkouchi Mohamed , Lalaoui Rhali M. H.
Published: May 2017

We solve the functional equation :
Effective regularity criteria for analytic mappings
Authors: Adamus Janusz
Published: May 2017

We survey recent developments in the study of singularities of complex-analytic mappings from a local algebraic viewpoint. We present several effective criteria for various modes of regularity of complex-analytic mappings in terms of vertical components in fibred powers of the mappings.
A set of integral elements of higher order jet spaces
Authors: Shibuya Kazuhiro
Published: May 2017

We will consider prolongations of the canonical systems on Jet spaces for multi independent variables. We will characterize appearances of singularities obtained from the prolongations.
Medial axis and a moment map
Authors: Siersma D. , van Manen M.
Published: May 2017

We use Maslov dequantization to compute the medial axis of an embedded hypersurface.
Bipartite pseudo-BL algebras
Authors: Walendziak Andrzej , Wojciechowska-Rysiawa Magdalena
Published: May 2017

The class of bipartite pseudo-BL algebras (denoted by
A short proof of the separable reduction theorem
Authors: Penot Jean-Paul
Published: May 2017

We present a simple proof of the separable reduction theorem, a crucial result of nonsmooth analysis which allows to extend to Asplund spaces the results known for separable spaces dealing with Fréchet subdifferentials. It relies on elementary results in convex analysis and avoids certain technicalities.
Some properties of lightlike submanifolds of semi-Riemannian manifolds
Authors: Kumar Rakesh , Rani Rachna , Nagaich R. K.
Published: May 2017

We initially obtain various relations and then establish necessary and sufficient condition for the integrability of screen distribution of a lightlike submanifold. We also establish necessary and sufficient condition for a lightlike submanifold to be totally geodesic.
On functions convex in the direction of the imaginary axis with real coefficients
Authors: Koczan Leopold , Sobczak-Kneć Magda , Zaprawa Paweł
Published: May 2017

Let

In this paper we determine the Koebe domain and the covering domain as well as the minorant and the majorant for the class consisting of functions convex in the direction of the imaginary axis with real coefficients.
On coupled first and second order boundary value problems in ordered Banach spaces
Authors: Herzog Gerd , Lemmert Roland
Published: May 2017

By means of a result on coupled first and second order differential inequalities and an intermediate value theorem in ordered Banach spaces, we obtain the existence of extremal solutions of boundary value problems of the form
B. Y. Chen’s inequalities for bi-slant submanifolds in Kenmotsu space forms
Authors: Pandey Pradeep Kumar , Gupta Ram Shankar , Sharfuddin A.
Published: May 2017

In this paper we obtain B. Y. Chen’s inequalities for a bi-slant submanifold
Well-posedness of fixed point problem for mappings satisfying an implicit relation
Authors: Akkouchi Mohamed , Popa Valeriu
Published: May 2017

The notion of well-posedness of a fixed point problem has generated much interest to a several mathematicians, for example, F. S. De Blassi and J. Myjak (1989), S. Reich and A. J. Zaslavski (2001), B. K. Lahiri and P. Das (2005) and V. Popa (2006 and 2008). The aim of this paper is to prove for mappings satisfying some implicit relations in orbitally complete metric spaces, that fixed point problem is well-posed.
Impulsive partial hyperbolic differential inclusions of fractional order
Authors: Abbas Saïd , Benchohra Mouffak
Published: May 2017

In this paper we investigate the existence of solutions of a class of partial impulsive hyperbolic differential inclusions involving the Caputo fractional derivative. Our main tools are appropriate fixed point theorems from multivalued analysis.
Properties of analytic functions defined by an integral operator
Authors: Cotîrlă Luminiţa-Ioana
Published: May 2017

In this paper we present some properties for the analytic functions in the open unit disc
New sufficient conditions for starlikeness of analytic functions involving a fractional differintegral operator
Authors: Prajapat J. K. , Raina R. K.
Published: May 2017

In this paper we apply a fractional differintegral operator to a class of analytic functions and derive certain new sufficient conditions for the starlikeness of this class of functions. The usefulness of the main results are depicted by deducing several interesting corollaries and relevances with some of the earlier results are also pointed out.
Quantitative estimates for the Lupaş q-analogue of the Bernstein operator
Authors: Finta Zoltán
Published: May 2017

We establish quantitative results for the approximation properties of the q-analogue of the Bernstein operator defined by Lupaş in 1987 and for the approximation properties of the limit Lupaş operator introduced by Ostrovska in 2006, via Ditzian-Totik modulus of smoothness. Our results are local and global approximation theorems.
Common fixed points for weakly compatible maps satisfying implicit relations without continuity
Authors: Akkouchi Mohamed
Published: May 2017

The purpose of this paper is to prove a common fixed point theorem for a set of four mappings on a complete metric space, using weak compatibility and a general implicit relation without appeal to continuity. Our results improve and generalize all the results obtained by A. Djoudi in a paper published in 2003.
On some classes of sets in extremally disconnected spaces
Authors: Duszyński Zbigniew
Published: May 2017

In the present paper several characterizations of the classical notion of extremally disconnected spaces are obtained. A few relationships for finite products of extremally disconnected spaces are also studied.
On continuous convergence of nets of multifunctions
Authors: Przemski Marian
Published: May 2017

This paper expands the classical concept of the continuous convergence of nets of multifunctions introduced by Cao, Reilly and Vamanamurthy in [7]. We introduce some new types of properties of convergence of such nets which guarantee the upper or lower semicontinuity of the limit multifunction. Furthermore, we obtain some analogous results concerning generalized continuity properties of multifunctions.
On a refinement of the majorisation type inequality
Authors: Khan M. Adil , Niezgoda Marek , Pečarić Josip
Published: May 2017

In this note, two mean value theorems are proved by using some recent results by Barnett et al. [N. S. Barnett, P. Cerone, S. S. Dragomir, Majorisation inequalities for Stieltjes integrals, Appl. Math. Lett. 22 (2009), 416-421]. A new class of Cauchy type means for two functions is studied. Logarithmic convexity for differences of power means is proved. Monotonicity of Cauchy means is shown.
A new proof of the faithfulness of the Temperley–Lieb representation of B
3
Authors: Piwocki A. H.
Published: May 2017

We find a way to calculate the term with lowest exponent in the Kauffman bracket polynomial of a closed 3-string braid. This leads us to a new proof of the faithfulness of the Temperley-Lieb representation of the 3-string braid group B
3. In particular we will prove that for any link with braid index 3 either the coefficient of the lowest degree term or the coefficient of the highest degree term of the Jones polynomial is equal to ±1.
A new class of multivalent analytic functions defined by the Hadamard product
Authors: Dziok Jacek
Published: May 2017

The object of the present paper is to investigate the coefficients estimates, distortion properties, the radii of starlikeness and convexity, subordination theorems, partial sums and integral mean inequalities for classes of functions with two fixed points. Some remarks depicting consequences of the main results are also mentioned.
The univalence of general integral operator Bazilevič
Authors: Pescar Virgil
Published: May 2017

In this paper we define a general integral operator Bazilevič and we obtain sufficient conditions for univalence of this integral operator.
Bertrand mate of timelike biharmonic Legendre curves in Lorentzian Heisenberg group Heis
3
Authors: Turhan Essin , Körpinar Talat
Published: May 2017

In this paper, we study Bertrand mate of timelike biharmonic Legendre curves in the Lorentzian Heisenberg group Heis
3. We characterize timelike biharmonic Legendre curves in terms of their curvature and torsion. Moreover, we obtain the position vectors of timelike biharmonic Legendre curves and we construct parametric equations of Bertrand mate of timelike biharmonic Legendre curves in the Lorentzian Heisenberg group Heis
3.
Some semilattice decompositions of dimonoids
Authors: Zhuchok Anatolii V.
Published: May 2017

We show that the system of axioms of a dimonoid is independent and prove that every dimonoid with a commutative operation is a semilattice of archimedean subdimonoids, every dimonoid with a commutative periodic semigroup is a semilattice of unipotent subdimonoids, every dimonoid with a commutative operation is a semilattice of a-connected subdimonoids and every idempotent dimonoid is a semilattice of rectangular subdimonoids.
Monounary algebras with same quasiorders or retracts
Authors: Jakubíková-Studenovská Danica , Petrejčíková Mária , Pócs Jozef
Published: May 2017

Let (A, f) be a monounary algebra. We describe all monounary algebras (A, g) having the same set of quasiorders, Quord(A, f) = Quord(A, g). It is proved that if Quord(A, f) does not coincide with the set of all reflexive and transitive relations on the set A and (A, f) contains no cycle with more than two elements, then f is uniquely determined by means of Quord(A, f). In the opposite case, Quord(A, f) = Quord(A, g) if and only if Con(A, f) = Con(A, g). Further, we show that, except the case when Quord(A, f) coincides with the set of all reflexive and transitive relations, if the monounary algebras (A, f) and (A, g) have the same quasiorders, then they have the same retracts. Next we characterize monounary algebras which are determined by their sets of retracts and connected monounary algebras which are determined by their sets of quasiorders.
Centralizer clones are preserved by category equivalences
Authors: Supaporn Worakrit
Published: May 2017

In this paper it will be proved that if a clone
Smooth Bruck loops, symmetric spaces, and nonassociative vector spaces
Authors: Kim Sejong , Lawson Jimmie
Published: May 2017

Our purposes in this work include the following: (1) Extend and expand earlier work on symmetric spaces, particularly that done from a nonassociative algebra point of view, from the finite-dimensional setting to the Banach space setting. (2) Take a careful look at the equivalence of the categories of smooth pointed reflection quasigroups (a special class of symmetric spaces) and uniquely 2-divisible Bruck loops (=
Embedding modes into semimodules, Part II
Authors: Pilitowska Agata , Romanowska Anna B.
Published: May 2017

The first part of this paper specified the semi-affinization semiring of a mode variety as the universal scalar semiring for semimodules whose idempotent subreducts lie in the given variety of modes. The current part of the paper focusses on some selected varieties of modes (affine spaces, barycentric algebras, semilattice modes), and computes the semi-affinization semirings of these varieties.
The Voronovskaja type theorem for an extension of Szász-Mirakjan operators
Authors: Pop Ovidiu T. , Bărbosu Dan , Miclăuş Dan
Published: May 2017

Recently, C. Mortici defined a class of linear and positive operators depending on a certain function ϕ, which generalize the well known Szász-Mirakjan operators. For these generalized operators we establish a Voronovskaja type theorem, the uniform convergence and the order of approximation, using the modulus of continuity.
On δ-perfectly continuous functions
Authors: Bayhan S. , Kanibir A. , Reilly I. L.
Published: May 2017

Recently the class of δ-perfectly continuous functions between topological spaces has been introduced and studied in some detail. In this paper we consider this class of functions from the point of view of change of topology. In particular, we demonstrate that the concept of δ-perfect continuity coincides with the notion of perfect continuity when the codomain of the function under consideration has been retopologized appropriately. This paper considers some of the consequences of this fact.
On θ-centralizers of semiprime rings
Authors: Huang Shuliang , Haetinger Claus
Published: May 2017

Let R be a semiprime ring with center Z(R) and θ be a surjective homomorphism. In this paper, we prove that T is a θ-centralizer if one of the following holds:

(i)

T(x)θ(y) = θ(x)T(y) for all x, y ∈ R, where T is a mapping.

(ii)

[T(x), θ(x)] = 0 for all x ∈ R, where T is a left θ-centralizer.

(iii)

2T(xyx) = T(x)θ(y)θ(x) + θ(x)θ(y)T(x) for all x, y ∈ R, where T is an additive mapping, θ(Z(R)) = Z(R) and R is 2-torsion free.
Stochastic semigroups and their applications to biological models
Authors: Pichór Katarzyna , Rudnicki Ryszard , Tyran-Kamińska Marta
Published: May 2017

Some recent results concerning generation and asymptotic properties of stochastic semigroups are presented. The general results are applied to biological models described by piecewise deterministic Markov processes: birth-death processes, the evolution of the genome, genes expression and physiologically structured models.
L-approach merotopies and their categorical perspective
Authors: Khare Mona , Tiwari Surabhi
Published: May 2017

In the present paper, we have made a category theoretic and lattice theoretic study of some nearness-like structures in the L-approach theory. Using L-grills, the notion of L-approach grill structure is introduced as a characterization of L-approach grill merotopy on X; their categorical perspectives and implications are also investigated. A number of illustrative examples are included.
Fuzzy anti-norm and fuzzy α-anti-convergence
Authors: Dinda Bivas , Samanta T. K. , Jebril Iqbal H.
Published: May 2017

In this paper the definition of fuzzy antinorm is modified. Some properties of finite dimensional fuzzy antinormed linear space are studied. Fuzzy
Implicit difference schemes for quasilinear parabolic functional equations
Authors: Matusik Milena
Published: May 2017

We present a new class of numerical methods for quasilinear parabolic functional differential equations with initial boundary conditions of the Robin type. The numerical methods are difference schemes which are implicit with respect to time variable. We give a complete convergence analysis for the methods and we show that the new methods are considerable better than the explicit schemes. The proof of the stability is based on a comparison technique with nonlinear estimates of the Perron type for given functions with respect to functional variables. Results obtained in the paper can be applied to differential equations with deviated variables and to differential integral problems.
I-uniform continuity and I-uniform boundedness of a function
Authors: Ghosal Sanjoy
Published: May 2017

The concepts of
Closedness of certain classes of functions in the topology of uniform convergence
Authors: Kohli J. K. , Aggarwal Jeetendra
Published: May 2017

In this paper, closedness of certain classes of functions in
Subalgebra lattices of a partial unary algebra
Authors: Pióro Konrad
Published: May 2017

Necessary and sufficient conditions will be found for quadruples of lattices to be isomorphic to lattices of weak, relative, strong subalgebras and initial segments, respectively, of one partial unary algebra. To this purpose we will start with a characterization of pairs of lattices that are weak and strong subalgebra lattices of one partial unary algebra, respectively. Next, we will describe the initial segment lattice of a partial unary algebra. Applying this result, pairs of lattices of strong subalgebras and initial segments will be characterized. Further, we will characterize pairs of lattices of relative and strong subalgebras and also other pairs of subalgebra lattices of one partial unary algebra.
On exponential decay for linear porous-thermo-elasticity system
Authors: Głowiński Przemysław , Łada Andrzej
Published: May 2017

We study the problem of exponential decaying for solutions of porous-thermoelasticity system, when time

In the considerations we apply the idea of compact decoupling for the system of equations. The exponential decaying property is proved first for the corresponding decoupled system, which is simpler to handle, then the property is derived for the original system.
On Hopf bifurcation of Liu chaotic system
Authors: Yassen M. T. , El-Dessoky M. M. , Saleh E. , Aly E. S.
Published: May 2017

In this paper, we analyze the dynamical behaviors of Liu system using the complementary-cluster energy-barrier criterion (CCEBC). Moreover, the Hopf bifurcation of this system is investigated using the first Lyapunov coefficient. Also, it is proved that this system has two Hopf bifurcation points, at which these Hopf bifurcations are non degenerate and subcritical.
On a nonlinear difference equation with variable delay
Authors: Huong Dinh Cong , Van Mau Nguyen
Published: May 2017

In this paper, some results on the equi-boundedness of solutions, the stability of the zero and the existence of positive periodic solutions of nonlinear difference equation with variable delay

x

n
+
1

=

λ
n

x
n

+

α
n

F
(

x

n
−

m
n

)
,
 
 
 
 
n
=
0
,
 
1
,
…

$$x_{n + 1} = \lambda _n x_n + \alpha _n F(x_{n - m_n } ),\,\,\,\,n = 0,\,1, \ldots $$

are obtained.
On asymmetric I and I
∗-divergence
Authors: Ghosal Sanjoy , Pal Sudip Kumar
Published: May 2017

In this paper we introduce and study the concepts of I-divergence and I
∗-divergence of sequences as well as double sequences in an asymmetric metric spaces. We investigate the interrelationship between I-divergence and I
∗-divergence and show that they are equivalent under some condition and prove some basic properties of these concepts.
On some properties and special identities in the second order matrix algebra over Grassmann algebras
Authors: Rashkova Tsetska
Published: May 2017

The paper considers the anticommutative multiplication property for the matrix algebra M
2(G) over the infinite Grassmann algebra G. We define as well some classes of *-symmetric and * skew-symmetric matrices in (M
2(G), *) for * being the transpose or the symplectic involution. As a consequence we give some *-identities for M
2(G) of degree < 8. Examples of the application of finite-dimensional Grassmann algebras in quantum field theory are mentioned and some properties of the algebras G
4 and M
2(G
4) are given as well.
Four-dimensional matrix transformation and A-statistical fuzzy Korovkin type approximation
Authors: Demirci Kamil , Karakuş Sevda
Published: May 2017

In this paper, we prove a fuzzy Korovkin-type approximation theorem for fuzzy positive linear operators by using A-statistical convergence for four-dimensional summability matrices. Also, we obtain rates of A-statistical convergence of a double sequence of fuzzy positive linear operators for four-dimensional summability matrices.
A note on generalized (m, n)-Jordan centralizers
Authors: Fošner Ajda
Published: May 2017

The aim of this paper is to define generalized (m, n)-Jordan centralizers and to prove that on a prime ring with nonzero center and char(R) ≠ 6mn(m+n)(m+2n) every generalized (m, n)-Jordan centralizer is a two-sided centralizer.
Numerical solutions of symmetric saddle point problem by direct methods
Authors: Smoktunowicz Alicja , Okulicka-Dłużewska Felicja
Published: May 2017

Numerical stability of two main direct methods for solving the symmetric saddle point problem are analyzed. The first one is a generalization of Golub’s method for the augmented system formulation (ASF) and uses the Householder QR decomposition. The second method is supported by the singular value decomposition (SVD). Numerical comparison of some direct methods are given.
Inequalities for Гpfunction and Gamma function
Authors: Yin Li , Song Zhi-Min
Published: May 2017

In this paper, we present a double inequality for the gamma function by estimating bounds of Гpfunction. Later, we also give a new inequality of gamma function.
Lp
-general approximations by multivariate singular integral operators
Authors: Anastassiou George A.
Published: May 2017

In this article, we study the Lp
, 1 ≤ p < ∞ approximation properties of general multivariate singular integral operators over RN
, N ≥ 1. We establish their convergence to the unit operator with rates. The established inequalities involve the multivariate higher order modulus of smoothness. We list the multivariate Picard, Gauss–Weierstrass, Poisson Cauchy and trigonometric singular integral operators where this theory can be applied directly.
Applications of convolution properties
Authors: Trojnar-Spelina Lucyna
Published: May 2017

K. I. Noor (2007 Appl. Math. Comput. 188, 814–823) has defined the classes 𝒬
k
(a, b, λ, γ) and 𝒯
k
(a, b, λ, γ) of analytic functions by means of linear operator connected with incomplete beta function. In this paper, we have extended some of the results and have given other properties concerning these classes.
On the category of pseudo-BCI-algebras
Authors: Dymek Grzegorz
Published: May 2017

The category
On the generalized order and generalized type of entire monogenic functions
Authors: Srivastava G. S. , Kumar Susheel
Published: May 2017

In the present paper we study the generalized growth of entire monogenic functions. The generalized order, generalized lower order and generalized type of entire monogenic functions have been obtained in terms of its Taylor’s series coefficients.
Injective composition operators on Lorentz–Bochner spaces
Authors: Datt Gopal , Arora S. C.
Published: May 2017

In this paper, we extend the notion of essential range to vector-valued functions and present various equivalent conditions for the injectiveness of the composition operators alongwith a characterisation for measurable transformations inducing composition operators between Lorentz–Bochner spaces. Some aspects of the weighted composition operators on Lorentz–Bochner spaces, induced by a measurable transformation and an operator valued map, are also discussed.
Experimental Study on Performance Enhancement of a Piezoelectric Vibration Energy Harvester by applying Self-Resonating Behavior
Authors: Aboulfotoh Noha , Twiefel Jens , Krack Malte , Wallaschek Jörg
Published: May 2017

This paper introduces a passive self-tuning energy harvester by applying self-resonating behavior. Under certain operating conditions, self-resonating systems have the capability to passively adjust their dynamical characteristics until the whole system becomes resonant. A clamped-clamped beam with an attached mass sliding freely with a slight gap showed self-resonating behavior. Under a harmonic input excitation and a well-defined operating regime, the mass moved along the beam thus causing a change in the natural frequency of the structure, and then stopped at the position where the natural frequency matched the excitation frequency, resulting in a significant increase in the vibration amplitude. For harvesting energy, a piezoelectric element was glued at one end of the beam. The operating regime of the self-resonating behavior was found experimentally in the two halves of the beam. In the half containing the piezoelectric element, self-resonating behavior was achieved between 126 Hz and 143 Hz. In the other half, it was achieved between 135 Hz and 165 Hz. Maximum power output of 2.5 mW was obtained under an input excitation of 4.92 m/s2 and 148 Hz. It is to be concluded that applying self-resonating behavior on energy harvesting provides a promising broadband technique.
Compartmental Model Diagrams as Causal Representations in Relation to DAGs
Authors: Ackley Sarah F. , Mayeda Elizabeth Rose , Worden Lee , Enanoria Wayne T. A. , Glymour M. Maria , Porco Travis C.
Published: May 2017

Compartmental model diagrams have been used for nearly a century to depict causal relationships in infectious disease epidemiology. Causal directed acyclic graphs (DAGs) have been used more broadly in epidemiology since the 1990s to guide analyses of a variety of public health problems. Using an example from chronic disease epidemiology, the effect of type 2 diabetes on dementia incidence, we illustrate how compartmental model diagrams can represent the same concepts as causal DAGs, including causation, mediation, confounding, and collider bias. We show how to use compartmental model diagrams to explicitly depict interaction and feedback cycles. While DAGs imply a set of conditional independencies, they do not define conditional distributions parametrically. Compartmental model diagrams parametrically (or semiparametrically) describe state changes based on known biological processes or mechanisms. Compartmental model diagrams are part of a long-term tradition of causal thinking in epidemiology and can parametrically express the same concepts as DAGs, as well as explicitly depict feedback cycles and interactions. As causal inference efforts in epidemiology increasingly draw on simulations and quantitative sensitivity analyses, compartmental model diagrams may be of use to a wider audience. Recognizing simple links between these two common approaches to representing causal processes may facilitate communication between researchers from different traditions.
Finite spaces and an axiomatization of the Lefschetz number
Authors: Bilski Paweł
Published: May 2017

In [1] Arkowitz and Brown presented an axiomatization of the reduced Lefschetz number of self-maps of finite CW-complexes. By the results of McCord [8], finite simplicial complexes are closely related to finite

T
0

{T_{0}}

-spaces. This connection and the axioms given by Arkowitz and Brown suggest an axiomatization of the reduced Lefschetz number of maps of finite

T
0

{T_{0}}

-spaces. However, using the notion of the subdivision of a finite

T
0

{T_{0}}

-space, we consider the degree and the Lefschetz number of not only self-maps. We also present some properties of the degree of maps between finite models of the circle

𝕊
1

{\mathbb{S}^{1}}

.
Group Tests for High-dimensional Failure Time Data with the Additive Hazards Models
Authors: Jiang Dandan , Sun Jianguo
Published: May 2017

Statistical analysis of high-dimensional data has been attracting more and more attention due to the abundance of such data in various fields such as genetic studies or genomics and the existence of many interesting topics. Among them, one is the identification of a gene or genes that have significant effects on the occurrence of or are significantly related to a certain disease. In this paper, we will discuss such a problem that can be formulated as a group test or testing a group of variables or coefficients when one faces right-censored failure time response variable. For the problem, we develop a corrected variance reduced partial profiling (CVRPP) linear regression model and a likelihood ratio test procedure when the failure time of interest follows the additive hazards model. The numerical study suggests that the proposed method works well in practical situations and gives better performance than the existing one. An illustrative example is provided.
Quality Assessment and Mathematical Modeling of Hot-Air Convective Drying of Persimmon (Diospyros kaki L.) Fruit
Authors: Giovagnoli-Vicuña Claudia , Moraga Nelson O. , Briones-Labarca Vilbett , Pacheco-Pérez Pablo
Published: May 2017

The influence of drying on the color, porosity, shrinkage and moisture of persimmon fruit during convective drying was determined by computer vision. The experiments were performed with persimmon fruit that were cut into slab 20 × 20 mm, which were arranged into a bigger slab, 60 × 60 mm. Drying process was carried out at 60 °C. Noticeable changes in quality parameters (color, porosity and shrinkage) could be observed during the drying process, where the central region of the sample evidenced less changes. Persimmon’s physical properties were experimentally obtained as the temperature function and heat and mass convective coefficients were adjusted as a time function. A numerical simulation using the Finite Volume Method allowed to describe the evolution of temperature and moisture content distributions during drying. The numerical and experimental results of temperature and moisture during persimmon drying were found to be in a good agreement.
Die EU hautnah erleben: Die Adaptation eines EU-Planspiels für den berufsbezogenen DaF-Unterricht
Authors: Hunstiger Agnieszka
Published: May 2017

Der Beitrag berichtet über das Potenzial von EU-Planspielen und ihre konkrete Umsetzung im berufsbezogenen DaF-Unterricht. Grundlage dafür bilden eigene Erfahrungswerte aus dem Einsatz von EU-Planspielen im Rahmen des Programms »DeutschLand - Deutsche Sprache in Deutschland«, eines Förderprogramms des Auswärtigen Amtes für höhere Bedienstete der EU-Institutionen und Ministerialbeamte aus den EU-Mitgliedstaaten und weiteren Staaten, das seit 1994 in dessen Auftrag vom Goethe-Institut durchgeführt wird.
Studiengangsbezogene Fachsprache in einem studienvorbereitenden Sprachkurs
Authors: Schimmel Dagmar
Published: May 2017

Die frühe Verzahnung von allgemein- und fachsprachlichen Kursinhalten sowie vor allem die Integration von Fachinhalten in den vorbereitenden Sprachkurs und die sprachbegleitende Förderung zu Beginn des Fachstudiums in einem technisch-naturwissenschaftlichen Fach ermöglichen einen erstaunlich schnellen Einstieg auch von absoluten Anfängern im Erlernen der deutschen Sprache. Das »Hannoveraner Modell« ist damit wegweisend für die Aufnahme ausländischer Studierender an den »Studienstandort Deutschland«, wenn in deutscher Sprache studiert werden soll.
Umgang mit Plagiaten an chinesischen Universitäten
Authors: Holtermann Sandra , Jansen Georg , Dege Christopher
Published: May 2017

An den chinesischen Universitäten ist heute das Anfertigen von Plagiaten so weit verbreitet, dass das wissenschaftliche Niveau nicht nur hinter den vom europäisch-amerikanischen Wissenschaftsverständnis herangetragenen Ansprüchen zurückbleiben muss, sondern zunehmend auch Bemühungen der chinesischen Bildungspolitik gefährdet werden, durch die verstärkte Besinnung auf Integrität, Eigenständigkeit und Unabhängigkeit die Qualität einheimischer akademischer Forschung zu verbessern.

Ausgehend von den Erfahrungen deutscher Lektoren in der universitären Unterrichtspraxis versucht der Beitrag, die spezifischen kulturellen und materiellen Bedingungen zu rekonstruieren, die in China die Plagiatsanfertigung offenbar in besonderer Weise begünstigen.

Im zweiten Teil wird ausführlich dargestellt, mit welchen Mitteln staatlicherseits auf die Entwicklung reagiert wird. Abgeschlossen wird die Analyse durch die kommentierte Darstellung eines exemplarischen Plagiatsfalls.
Sprechen über Deutschland
Authors: Grupp Katja
Published: May 2017

Empirische Untersuchungen zur Landeskunde im Fach Deutsch als Fremdsprache sind selten. Anhand von Interviews wurde der Versuch unternommen, die Vorstellungen von Deutschland bei einer Kaliningrader Studiengruppe zu untersuchen. Stereotype Bilder und übernommene Vorstellungen werden dabei nicht auf ihren Wahrheitsgehalt hin untersucht, sondern es interessiert ihre Funktion in der jeweiligen Lerner-Biografie. Herausgearbeitet werden sollen auch die Faktoren, die zu eventuellen Änderungen in bestehenden Vorstellungen führen könnten. Die Untersuchung wurde auf Basis der Grounded Theory durchgeführt.
Sprachstandsermittlung und Lernfortschrittstest mal anders. Die »Elicited Imitation Task« als ein Fenster zur lernersprachlichen Grammatik
Authors: Winkler Steffi
Published: May 2017

Der vorliegende Beitrag beschäftigt sich mit dem sogenannten »Elicited Imitation Task« (EI), einer in der psycholinguistischen Forschung etablierten Datenerhebungsmethode, welche hier als ein Instrument zur Messung fremd-bzw. zweitsprachlicher Grammatikkompetenz vorgestellt wird. Die Funktionalität der EI wird anhand einer Studie mit italienischen Universitätsstudenten, Lernern in DaF-Anfängerkursen an der Università degli studi di Pavia, demonstriert. Im Zentrum der Datenerhebungen stehen zwei für das Deutsche charakteristische grammatische Phänomenbereiche, die Satzklammer sowie die postfinite Realisierung der Satznegation. Nach einer kurzen Darlegung der psycholinguistischen Fundierung einer EI werden zunächst Testdesign sowie Testablauf erläutert. Die Ergebnisse, welche einen sukzessiven, systematischen Erwerb der untersuchten sprachlichen Phänomene widerspiegeln, werden alsdann im Lichte natürlicher Erwerbssequenzen ausgewertet und interpretiert. Im Anschluss daran werden methodische Aspekte der EI, vor allem unter dem Gesichtspunkt ihres Einsatzes im Sprachunterricht, näher betrachtet.
Gesprochenes Deutsch für die Auslandsgermanistik – Eine Projektvorstellung
Authors: Weidner Beate
Published: May 2017

DaF-Lehrwerke orientieren sich heute oftmals noch rein an den Normen der deutschen Schriftsprache. Auch sind Informationen über die Strukturen des gesprochenen Deutsch für Lehrende nur in unzureichendem Maß vorhanden. Der Beitrag stellt das vom DAAD geförderte Projekt »Gesprochenes Deutsch für die Auslandsgermanistik« vor, welches authentisches Gesprächsmaterial deutscher MuttersprachlerInnen sowie darauf aufbauende Informationseinheiten für den DaF-Unterricht in der Auslandsgermanistik bereitstellt.
Deutsch als Fremdsprache an chinesischen Schulen. Hintergründe und Thesen zu den Ursachen eines Booms
Authors: Bao Qiaoqiao , Mitschian Haymo
Published: May 2017

Entgegen den globalen Tendenzen verzeichnet die Nachfrage nach Unterricht in Deutsch als Fremdsprache an chinesischen Schulen in letzter Zeit einen bemerkenswerten Anstieg. Ein Blick auf die bisherige Entwicklung der Fremdsprache Deutsch in den Schulen des Landes sowie eine Beschreibung der momentanen Nachfrage- und Versorgungssituation liefert Informationen zum Hintergrund dieses Booms. Darauf aufbauend lassen sich Aussagen zu den Motiven der daran beteiligten Akteure skizzieren, also den Schülern, den Schülereltern, den Schulen, der Schulverwaltung und den bildungspolitisch verantwortlichen Organisationen, die die Basis einer nachfolgenden, tiefergehenden Beschreibung und Analyse abgeben. Die Interpretation von im Jahr 2011 selbst erhobenen Daten zum momentanen Stand lässt erkennen, dass sich bei der Erweiterung des Deutschangebots an chinesischen Mittelschulen die Interessen der Anbieter und diejenigen der Abnehmer in hohem Maße decken, so dass von einer nachhaltigen Entwicklung ausgegangen werden kann.
Wortbildung: Problemfelder im DaF-Unterricht
Authors: Gärtner Angelika
Published: May 2017

Die Wortbildung stellt einen komplexen und in Bezug auf die Didaktisierung von Deutsch als Fremdsprache einen problemintensiven Bereich der deutschen Sprache dar. Im vorliegenden Artikel werden Basisprobleme bei der Vermittlung von Wortbildung in spezifischen Feldern aufgezeigt und am Beispiel des ausgewählten Problemfeldes der Okkasionalismen Unterrichtsmaterialien (Text und Aufgabenblatt in exemplarischer Form) vorgestellt. Dadurch wird Lehrenden die Möglichkeit gegeben, sowohl einen Überblick zur Vermittlung von Wortbildung als auch konkrete Didaktisierungsvorschläge zu erhalten.
Recht als Kultur. Theoretische Reflexionen zum Fachfremdsprachenunterricht Rechtsdeutsch
Authors: Meyer Almut
Published: May 2017

(Fremdes) Recht verstehen setzt voraus, dass es in seiner Kulturgebundenheit erfasst wird. Für den Fachfremdsprachenunterricht Rechtsdeutsch wurde ein Ansatz entwickelt, der kulturelle Dimensionen des Rechts systematisch erschließt. Um diesen kulturwissenschaftlichen Ansatz aus den Rechtswissenschaften heraus zu legitimieren, wird er in diesem Artikel theoretisch vor dem Hintergrund ausgewählter rechtswissenschaftlicher Kulturkonzepte reflektiert. Es soll damit eine theoretische Basis für interdisziplinäre Kooperation im und mit dem Recht geschaffen werden.
Zur Vermittlung der Fachsprache Jura in Taiwan
Authors: Merkelbach Chris
Published: May 2017

Auf Taiwan gilt das Recht der Republik China, welches stark vom kontinentaleuropäischen Recht beeinflusst ist. Aus diesem Grunde gibt es eine gut entwickelte wissenschaftliche Zusammenarbeit zwischen der Bundesrepublik Deutschland und der Republik China auf Taiwan. Viele Studierende gehen nach Deutschland, um dort zu forschen. Dies hatte zur Folge, dass der Deutschunterricht für Rechtswissenschaftler bereits zu einem sehr frühen Zeitpunkt einen festen Bestandteil der Studienordnung darstellte. Der vorliegende Artikel beschäftigt sich mit der Vermittlung der deutschen juristischen Fachsprache (FsJ) an taiwanischen Universitäten, besonders an der National Taiwan University. Es wird besonders darauf eingegangen, welche relevanten linguistischen Besonderheiten für die Vermittlung der juristischen Fachsprache beachtet werden müssen, aber auch welche didaktisch-methodischen Entscheidungen für die Lehrenden und die Lernenden in dieser spezifischen Situation eine Rolle spielen. Der Artikel beschreibt, wie die juristische Fachsprache in diesem komplexen Situationsgefüge bereits auf dem Anfängerniveau unterrichtet werden kann und welche didaktischmethodischen Begründungen diesen Entscheidungen zugrunde liegen.
Argumentative Topoi als Ressource für die Argumentationsschulung im DaF-Unterricht
Authors: Massud Abdel-Hafiez
Published: May 2017

Dieser Beitrag beschäftigt sich mit der Argumentationskompetenz im DaF-Unterricht und konzentriert sich dabei auf die argumentativen Topoi im Sinne der Argumentationsschemata, die auf Aristoteles zurückgehen. Nach der theoretischen Etablierung der Begriffsdefinition und der Einführung in die vorhandenen Typologien dieser Argumentationsmuster wird ein mehrschrittiger didaktischer Ansatz vorgestellt, wie die argumentativen Topoi in die DaF-Didaktik mündlich und schriftlich ertragreich aufgenommen werden können. Der Ansatz wird nicht nur theoretisch vorgestellt, sondern auch an einem praktischen Beispiel erläutert, nämlich an dem Gedicht »Was gesagt werden muss« von Günter Grass und an einigen diesbezüglichen Online-Kommentaren deutscher Muttersprachler. Es wird aufgezeigt, dass die Didaktisierung dieser Topoi in einen argumentationsorientierten einheitlichen DaF-Unterricht mit Erfolg integriert werden kann und als Zugang zur vertiefenden Landeskunde und als Stimulator zum bewussten strategischen Spracherwerb dienen kann.
Der umstrittene Kolonialzeit-Roman Imperium von Christian Kracht als Gegenstand im DaF-Unterricht
Authors: Mehrens Dietmar
Published: May 2017

Im Frühjahr 2012 sorgte der Roman Imperium des Schweizers Christian Kracht für Aufsehen in der deutschen Literaturszene. In diesem Aufsatz wird gezeigt, dass sich der Roman unter verschiedenen Vorzeichen für die Behandlung im DaF-Unterricht eignet. Als Textgrundlage im Landeskundeunterricht ist er geeignet, die kurze Ära des deutschen Kolonialismus zu veranschaulichen, in literaturwissenschaftlichen Kursen bietet sich der Roman an zur Exemplifizierung der zum Teil widersprüchlichen Ergebnisse, zu denen unterschiedliche methodische Zugänge führen können. Dies wird gezeigt anhand der stark voneinander abweichenden Bewertungen, zu denen ein rezeptionsorientierter und ein eher textimmanenter Zugang führten, sowie anhand der Möglichkeiten, die der Roman für eine Interpretationsmethodik eröffnet, die den vielen intertextuellen bzw. intermedialen Referenzen innerhalb des Romans Rechnung trägt und auf diese Weise möglichen Missverständnissen bei der Textdeutung entgegenwirken könnte.
Teil 1: Hochschulebene. »Das Beste aus beiden Welten«!? Deutsch-niederländische Zusammenarbeit in einem binationalen Joint-Degree-Masterstudiengang
Authors: Jentges Sabine , Wilp Markus
Published: May 2017

Dieser Beitrag stellt den binationalen zweijährigen Joint-Degree-Masterstudiengang »Niederlande-Deutschland-Studien« vor, indem zum einen die positiven Effekte eines konsequent binational konzipierten Studiengangs auf den Studienverlauf und die alltäglichen Lernerfahrungen der Studierenden dargestellt, zum anderen Einsichten in einige der Probleme und Herausforderungen gegeben werden, die ein konsequent binational konzipierter Studiengang vor allem auf organisatorischer und rechtlicher Ebene zu bewältigen hat. Die abschließende Diskussion geht auf den Wert solcher binationaler Studienprogramme ein und versucht, nötige und erstrebenswerte Rahmenbedingungen für das Gelingen solcher Programme zu benennen.
»Erinnerungsorte« als Impulse für grenzübergreifende Kooperationen in Lehre und Unterricht. Kulturdidaktische Modellbildungen in einem deutschpolnischen Kooperationsprojekt
Authors: Badstübner-Kizik Camilla , Hille Almut
Published: May 2017

Der Beitrag beschreibt den Weg einer deutsch-polnischen akademischen Kooperation, die in vier Schritten von einer thematisch eher undifferenzierten bilateralen Zusammenarbeit über thematisch stärker profilierte, adressatenorientierte sowie multilaterale Initiativen wiederum zu konkreten bilateralen Projekten führt. Abschließend werden (typische) Erfolge und Schwierigkeiten grenzübergreifender akademischer Kooperation bilanziert.
Apologetik – Aktivierung von Stereotypen – mediale Interferenz. Fallstricke kulturbezogenen Lernens
Authors: Fornoff Roger
Published: May 2017

Der vorliegende Artikel1 präsentiert Ergebnisse einer empirischen Forschungsarbeit zur Thematik kulturbezogenen Lernens, die im Studienjahr 2012/13 an der Germanistischen Abteilung der Universität Belgrad durchgeführt wurde. Im Blickpunkt stehen jedoch keine Beispiele gelungenen kulturellen Lernens; vielmehr geht es darum, wie und auf welche Weise kulturbezogene Lernprozesse im Sinne eines gesteuerten Lernens scheitern können, was sie verhindern, erschweren oder auf Abwege führen kann. Denn wie die empirischen Befunde der hier vorgestellten Studie zeigen, lernen Studierende oft nicht das, was sie nach Meinung des Dozenten lernen sollen, oder anders formuliert: Die vom Dozenten erwarteten und angesteuerten Lernziele sind häufig nicht identisch mit den tatsächlichen Lernresultaten der Studierenden. Die Steuerung kulturbezogener Lernprozesse ist mithin schwierig und funktioniert keineswegs immer. Im Folgenden werden drei unterschiedliche Modi des partiellen oder vollständigen Scheiterns kulturbezogener Sinnbildungsprozesse beschrieben. Ich habe sie Apologetik, Aktivierung von Stereotypen und mediale Interferenz genannt.