bluuebunny/crossref_metadata_2025_split huggingface dataset:
Embedding modes into semimodules, Part II
Authors: Pilitowska Agata , Romanowska Anna B. 
Published: May 2017

AbstractThe 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
Implicit difference schemes for quasilinear parabolic functional equations
Authors: Matusik Milena 
Published: May 2017

AbstractWe 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.
Subalgebra lattices of a partial unary algebra
Authors: Pióro Konrad 
Published: May 2017

AbstractNecessary 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

AbstractWe study the problem of exponential decaying for solutions of porous-thermoelasticity system, when timeIn 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
Lp
-general approximations by multivariate singular integral operators
Authors: Anastassiou George A. 
Published: May 2017

Abstract
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

Abstract
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.
Injective composition operators on Lorentz–Bochner spaces
Authors: Datt Gopal , Arora S. C. 
Published: May 2017

AbstractIn 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

Abstract
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

AbstractCompartmental 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

Abstract
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

AbstractStatistical 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

Abstract
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

Zusammenfassung
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

Zusammenfassung
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

Zusammenfassung
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

Zusammenfassung
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

Zusammenfassung
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

Zusammenfassung
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

Zusammenfassung
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

Zusammenfassung
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

Zusammenfassung
(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.