bluuebunny/crossref_metadata_2025 huggingface dataset:
Benutzerzentrierte, graphische Interaktionsmetaphern für FahrerinformationssystemeUser-Centered, Graphical Interaction Metaphors for In-Vehicle Information Systems
Authors: Broy Verena
Published: September 2009

Konventionellen Menüdarstellungen in Fahrerinformationssystemen (FIS) mangelt es an einem adäquaten Interaktionsmodell für die typischerweise heterogene Benutzergruppe. Um Attraktivität und Gebrauchstauglichkeit zu erhöhen, wird ein graphischer, metaphernbasierter Ansatz entwickelt. Dreidimensionale Anzeige-Bedienkonzepte sowie kartographische Repräsentationen großer Datenmengen und erklärende Animationen werden aus vertrauten Gegenständen und deren physikalischen Eigenschaften abgeleitet. Eine benutzerbasierte Evaluierung bezüglich Attraktivität, Gebrauchstauglichkeit und Verträglichkeit mit der Fahraufgabe weist empirisch eindeutige Vorteile hinsichtlich der Herausforderungen für FIS nach.
Downscaling Multiple Seismic Inversion Constraints to Fine-Scale Flow Models
Authors: Kalla Subhash , White Christopher D. , Gunning James , Glinsky Michael E.
Published: September 2009

Well data reveal reservoir layering with high vertical resolution but are areally sparse, whereas seismic data have low vertical resolution but are areally dense. Improved reservoir models can be constructed by integrating these data. The proposed method combines stochastic seismic inversion results, finer-scale well data, and geologic continuity models to build ensembles of flow models.

Stochastic seismic inversions operating at the mesoscale generate rock property estimates, such as porosity, that are consistent with regional rock physics and true-amplitude imaged seismic data. These can be used in a cascading workflow to generate ensembles of fine-scale reservoir models wherein each realization from the Bayesian seismic inversion is treated as an exact constraint for a subensemble of fine-scale models. Exact constraints ensure that relevant interproperty and interzone correlations implied by rock physics and seismic data are preserved in the downscaled models. Uncertainty in the rock physics and seismic response is included by using multiple stochastic inversions in a cascading workflow. In contrast, inexact constraints generally do not preserve these correlations. We use two-point covariance at the fine scale to provide prior model thickness and porosity distributions of multiple facies. A Bayesian formulation uses the kriged data as the prior with the coarse constraints as the likelihood, and this posterior is sampled using a Markov Chain Monte Carlo (MCMC) method in a sequential simulation framework.

These methods generate rich pinchout behavior and flexible spatial connectivities in the fine-scale model. These flow models are easily represented on a cornerpoint grid. 2D examples illustrate the interactions of prior and constraint data, and 3D examples demonstrate algorithm performance and the effects of stratigraphic variability on flow behavior.
Measurements and Indicators: Definitions, Concepts and Examples
Authors: Boutayeb Abdesslam , Boutayeb Saber
Published: September 2009

The importance of equity in health necessitates concise definitions of concepts and tools used
either to describe the distribution of ill-health as a phenomenon in time and space, or to understand the
causes underlying unfair and avoidable inequalities in order to act on them. Consequently, the measures of
health inequalities depend on the approach adopted to distinguish different groups of a population (by sex,
socioeconomic status, education level, residence area, income, ethnic groups, …), the health variable to be
described (mortality, morbidity, expectancy, quality of life, nutrition, access to services, …), and the
methods and tools for description and analysis (absolute numbers, relative differences, odd ratios,
concentration index, regression, component analysis, discriminant analysis, …). This first chapter is
dedicated to the main concepts and indicators related to health measurements. Illustrative examples are
given and clarifications are provided through remarks and discussions.
Equity and Disease Burden
Authors: Boutayeb Abdesslam , Boutayeb Saber
Published: September 2009

The contrast between life expectancy of 43 years for a woman in sub-Saharan Africa compared
with 86 years for a woman in Japan is inconceivable and unfair. This is not a mere inequality it is one kind
of health inequities existing between developed and developing countries. A multitude of other such health
inequities are given by maternal mortality, infant mortality, diseases burden and access to different basic
health services such as vaccination, antenatal care, postnatal visits, hospital beds, number of health
personnel. Health inequity, however, is not a special feature characterizing the difference between rich and
poor countries, neither is poor health confined to those worst off. In all countries, independently of their
income and level of development, health and illness follow a social gradient. For instance, in the U.K, the
28 year life expectancy gap between men living in two different cities is incredible.
Contentious Implementation and Retrenchment in Neoliberal Policy Reform: The Global Electric Power Industry, 1989–2001
Authors: Zelner Bennet A. , Henisz Witold J. , Holburn Guy L. F.
Published: September 2009

We develop theory about the effect of domestic and global institutional forces across countries and over time, following a national government's adoption of a globally diffusing policy, on retrenchment—the degree to which a government reinstates the objectives of a policy's predecessor without repealing the new policy to balance conflicting institutional forces. World political culture legitimates and supports the new policy, while the policy's domestic opponents seek to mobilize opposition to it. Peer country governments' behavior and intergovernmental organizations may help or hinder domestic opponents' efforts. We tested our model by examining governments' renegotiation of the terms of private electricity generation projects in 62 countries in 1989–2001. Although no country formally repealed electricity liberalization during that period, governments selectively renegotiated the terms of private investment in roughly 20 percent of private power generation projects in countries that liberalized. Results support our hypotheses about the effects of domestic and global institutional forces—the former of which we measure through automated natural language parsing of 8.52 million newspaper articles—and the idea that domestic audiences' preexisting cognitive constructs and normative beliefs shape governments' implementation of globally diffusing policies.
Optimal Structure, Market Dynamism, and the Strategy of Simple Rules
Authors: Davis Jason P. , Eisenhardt Kathleen M. , Bingham Christopher B.
Published: September 2009

Using computational and mathematical modeling, this study explores the tension between too little and too much structure that is shaped by the core tradeoff between efficiency and flexibility in dynamic environments. Our aim is to develop a more precise theory of the fundamental relationships among structure, performance, and environment. We find that the structure-performance relationship is unexpectedly asymmetric, in that it is better to err on the side of too much structure, and that different environmental dynamism dimensions (i.e., velocity, complexity, ambiguity, and unpredictability) have unique effects on performance. Increasing unpredictability decreases optimal structure and narrows its range from a wide to a narrow set of effective strategies. We also find that a strategy of simple rules, which combines improvisation with low-to-moderately structured rules to execute a variety of opportunities, is viable in many environments but essential in some. This sharpens the boundary condition between the strategic logics of positioning and opportunity. And juxtaposing the structural challenges of adaptation for entrepreneurial vs. established organizations, we find that entrepreneurial organizations should quickly add structure in all environments, while established organizations are better off seeking predictable environments unless they can devote sufficient attention to managing a dissipative equilibrium of structure (i.e., edge of chaos) in unpredictable environments.
Relative Bargaining Power, Corporate Restructuring, and Managerial Incentives
Authors: Dencker John C.
Published: September 2009

Using longitudinal personnel data from a U.S. Fortune 500 manufacturing firm for the period of 1967 to 1993, I assess the effects of corporate restructuring and power differences between a firm and its managers on the nature and use of different incentives. I extend relative bargaining power theory to predict that a firm's ability to provide incentives in the ways it prefers—bonuses instead of increases to base salary or promotions—varies due to differences over time in monitoring and sanctions stemming from organizational change processes. Findings are consistent with the theory and show a negative effect of bonuses on salary increases and of bonuses on promotions, with tradeoffs greatest when the firm's oversight of rewards was highest and termination threats were most explicit. Further support for the theory is the finding that the strength of the negative effect of bonuses on promotions varied across managerial groups due to differences in managers' bargaining power: “fast-trackers” were much less likely to experience a tradeoff than were low performing managers, and women were less likely to experience a tradeoff than were men.
Credit and Classification: The Impact of Industry Boundaries in Nineteenth-Century America
Authors: Ruef Martin , Patterson Kelly
Published: September 2009

In this article, we examine how issues of multi-category membership (hybridity) were handled during the evolution of one of the first general systems of industrial classification in the United States, the credit rating schema of R. G. Dun and Company. Drawing on a repeated cross-sectional study of credit evaluations during the postbellum period (1870–1900), our empirical analyses suggest that organizational membership in multiple categories need not be problematic when classification systems themselves are emergent or in flux and when organizations avoid rare combinations or identities involving ambiguous components. As Dun's schema became institutionalized, boundaries between industries were more clearly defined and boundary violations became subject to increased attention and penalty by credit reporters. Our perspective highlights the utility of an evolutionary perspective and tests its implications for the salience of distinct mechanisms of hybridity.
Labor, Capital Service, and Productivity Contributions to National Economic Growth: Focusing on the Japanese Case
Authors: Mulugetta Abraham , Mulugetta Yuko
Published: September 2009

This study examines labor and capital service inputs as well as multi-factor productivity growth in Japan and compares results to eight other industrial nations using OECD's productivity data from 1985 to 2007. The study reveals that since 1991 Japan's economic growth has been negatively measured by all three discriminant functions identified.
The Volatility of Sovereign Wealth Funds
Authors: Grennes Thomas J.
Published: September 2009

This paper evaluates sovereign wealth funds in light of the extreme volatility of energy prices and the severe global recession that began in 2008. A recent paper by Das characterized the assets of funds as showing steady growth in the past and likely increased importance in the future. However, recent developments have reduced the relative importance of funds and have demonstrated the sensitivity of the funds to energy prices and world business cycles. Investments by sovereign wealth funds have the potential to introduce political influence into corporate governance, but this potential is much smaller than the interventions into corporate governance by governments of the United States and elsewhere connected to corporate bail-outs during the recession. Lack of transparency remains a problem for certain sovereign wealth funds, but anti-recession interventions by governments have been characterized by extreme lack of transparency.
Will the Dollar be Dethroned as the Main Reserve Currency?
Authors: Carbaugh Robert J. , Hedrick David W.
Published: September 2009

The U.S. dollar was in the line of fire as leaders from the largest developed and developing countries participated in the G8 meeting in July, 2009. China and other emerging market heavyweights such as Russia and Brazil are pushing for debate on an eventual shift away from the dollar to a new global reserve currency. These countries are particularly concerned about the heavy debt burden of the United States and fear inflation will further debase the dollar which has lost 33 percent in value against other major currencies since 2002. Will the dollar continue as the main reserve currency of the world? What are the other currencies to watch as challengers to the throne? This paper addresses these questions.
General conformal almost symplectic N-linear connections in the bundle of accelerations
Authors: Purcaru Monica , Aldea Nicoleta
Published: September 2009

The aim of this paper is to find the transformation for the coefficients of an N-linear connection on E = Osc2M, by a transformation of nonlinear connections, to define in the bundle of accelerations the general conformal almost symplectic N-linear connection notion and to determine the set of all general conformal almost symplectic N-linear connections on E. We treat also some special classes of general conformal almost symplectic N-linear connections on E.
Variations on a theme of Kaplansky
Authors: Harte Robin
Published: September 2009

We explore the relationship between Kaplansky's lemma about locally algebraic operators, a dual to Kaplansky's lemma, and non singularity for pairs of operators in the sense of Joseph L. Taylor.
Arens-Royden and the spectral landscape
Authors: Harte Robin
Published: September 2009

In this note we attempt to deconstruct the Arens-Royden theorem, and to offer an abstraction of the spectral picture of an operator. We also show dramatically why the invertible group of operators on certain product Banach spaces is not connected.
Geodesic mappings between Kahlerian spaces
Authors: Mikes Josef , Pokorna Olga , Starko Galina
Published: September 2009

Geodesic mappings from a Kahlerian space Kn onto a Kahlerian space Kn will be investigated in this paper. We present a construction of Kahlerian space Kn which admits non-trivial geodesic mapping onto Kahlerian space Kn.
On some generalized difference sequences with respect to a modulus function
Authors: Et Mikail , Altin Yavuz , Altinok Hifsi
Published: September 2009

The idea of difference sequence spaces was intro- duced by Kizmaz [9] and generalized by Et and Colak [6]. In this paper we introduce the sequence spaces [V, ?, f, p]0 (?r, E), [V, ?, f, p]1 (?r, E), [V, ?, f, p]? (?r, E) S? (?r, E) and S?0 (?r, E) where E is any Banach space, examine them and give various properties and inclusion relations on these spaces. We also show that the space S? (?r, E) may be represented as a [V, ?, f, p]1 (?r, E)space.
Complex Jacobi matrices and quadrature rules
Authors: Milovanovic Gradimir , Cvetkovic Aleksandar
Published: September 2009

Given any sequence of orthogonal polynomials, satisfying the three term recurrence relation xpn(x) = ?n+1pn+1(x) + ?npn(x) + ?npn-1(x), p-1(x)=0 po(x)=1 with ?n ? 0, n ? N, ?0 = 1, an infinite Jacobi matrix can be associated in the following way ? ? ??0 ?1 0...? ? ? ??1 ?1 ?2...? ? ? J = ?0 ?2 ?2...? ?.... ? ?.... ? ?....? ? ? In the general case if the sequences {?n} or {?n} are complex the associated Jacobi matrix is complex. Under the condition that both sequences {?n}and {?n} are uniformly bounded, the associated Jacobi matrix can be understood as a linear operator J acting on ?2, the space of all complex square-summable sequences, where the value of the operator J at the vector x is a product of an infinite vector x and an infinite matrix J in the matrix sense. The case when the sequences {?n} and {?n} are not uniformly bounded, an operator acting on ?2 can not be defined that easily. Additional properties of the sequence of orthogonal polynomials are needed in order to be able to define the operator uniquely. The case when the sequences ?n and ?n are real is very well understood. The spectra of the Jacobi matrix J equals the support of the measure of orthogonality for the given sequence of orthogonal polynomials. All zeros of orthogonal polynomials are real, simple and interlace, contained in the convex hull of the spectra of the Jacobi operator associated with the infinite Jacobi matrix J. Every point in ?(J) attracts zeros of orthogonal polynomials. An application of orthogonal polynomials is the construction of quadrature rules for the approximation of integration with respect to the measure of orthogonality. For arbitrary sequences {?n} and {?n} the situation is changed dramatically. Zeros of orthogonal polynomials need not be simple; they are not real and they do not necessarily lie in the convex hull of ?(J). There is also a little known about convergence results of related quadrature rule. Only in recent years a connection between complex Jacobi matrices and related orthogonal polynomials is interesting again (see [2]). Studies of complex Jacobi operators should lead to a better understanding of related orthogonal polynomials, but also the study of orthogonal polynomials with the complex Jacobi matrices should put more light on the non-hermitian banded symmetric matrices. In this lecture some results are given about complex Jacobi matrices and related quadrature rules, and also some interesting examples are presented.
Matrix multiplication on bidirectional linear systolic arrays
Authors: Milovanovic Igor , Milovanovic Emina , Randjelovic Branislav , Jovanovic Ivan
Published: September 2009

This paper addresses the problem of rectangular matrix multiplication on bidirectional linear systolic arrays (SAs). We analyze all bidirectional linear SAs in terms of efficiency. We conclude that the efficiency depends on the relation between the loop boundaries in the systolic algorithm (i.e. matrix dimensions). We point out which SA is the best choice depending on the relation between matrix dimensions. We have designed bidirectional linear systolic arrays suitable for rectangular matrix multiplication.
Derivative free method for the simultaneous inclusion of polynomial zeros
Authors: Petkovic Miodrag , Milosevic Dusan
Published: September 2009

A combined method for the simultaneous inclusion of complex zeros of a polynomial, composed of two circular arithmetic methods, is presented. This method does not use polynomial derivatives and has the order of convergence equals four. Computationally variable initial conditions that guarantee the convergence are also stated. Two numerical example are included to demonstrate the convergence speed of the presented method.
Several modifications of simplex method
Authors: Stojkovic Nebojsa , Stanimirovic Predrag , Petkovic Marko
Published: September 2009

We analyze the problem of finding the first basic solution in the two phases simplex algorithm. Also, a modification and several improvements of the simplex method are introduced. We report computational results on numerical examples from Netlib test set.
Direct local and global approximation theorem for Bernstein-type operators
Authors: Finta Zoltan
Published: September 2009

Direct local and global estimates are established for Bernstein - type operators using Ditzian - Totik modulus of smoothness of second order.
On measure of non-compactness in convex metric spaces
Authors: Gajic Ljiljana
Published: September 2009

In this paper new results concerning the measure of non-compactness in convex metric spaces are presented.
A general fixed point theorem for four weakly compatible mappings satisfying an implicit relation
Authors: Popa Valeriu
Published: September 2009

In this paper, using a combination of methods used in [5], [14], [15] and [17] the results of [1, Theorems 2.2 and 2.3] and [15, Theorem 3] are improved by removing the assumptions of continuity and reciprocally continuity, relaxing compatibility and compatibility of type (A) to weakly compatibility and replacing the completeness of the space with a set of four alternative conditions for four mappings satisfying an implicit relation.
Characterizing Hermitian, normal and EP operators
Authors: Djordjevic Dragan , Koliha J.J.
Published: September 2009

In this paper further characterizations of Hermitian, normal and EP operators on Hilbert spaces are established. Thus the recent results of O. M. Baksalary and G. Trenkler (Linear Multilin. Algebra, to appear) are extended to the infinite dimensional setting with proofs based on operator matrices.
Generalized inversion by interpolation
Authors: Stanimirovic Predrag , Tasic Milan , Krtolica Predrag , Karampetakis Nikolas
Published: September 2009

We investigate two algorithms for computing the Moore-Penrose and Drazin inverse of a given one-variable polynomial matrix by interpolation. These algorithms differ in the method used for constant matrices inverses computing. The first algorithm uses the Grevile?s method, and the second one uses the Leverrier-Faddeev method and its generalization. These algorithms are especially useful for symbolic computation in procedural programming languages. We compare results by implementing the algorithms in the programming package MATHEMATICA and in the procedural programming languages DELPHI and C++.
Some subclasses of meromorphic functions
Authors: Acu Mugur
Published: September 2009

In this paper we define some subclass of meromorphic functions and we obtain some properties of these classes. .
Some generalizatons of almost contra-super-continuity
Authors: Ekici Erdal
Published: September 2009

We introduced and studied some new classes of functions called (e*, s)-continuous functions, (e, s)-continuous functions and (a, s)-continuous functions. These new notions of functions generalize the class of almost contra-super-continuous functions. Some properties and several characterizations of these types of functions are obtained. We investigate the relationships between these classes of functions and other classes of non-continuous functions. .
Coincidence points and invariant approximation results on q-normed spaces
Authors: Nashine Kumar
Published: September 2009

We present coincidence points results for multivalued /- nonexpansive mappings in the setting of nonstarshaped domain of q-normed space which is not necessarily a locally convex space. As application, an invariant approximation result is also obtained. Our results improve and extend the results of Bano, Khan and Latif [1], Hussain [4], Latif and Tweddle [7], Rhoades [11], Sahab, Khan and Sessa [13], Shahzad [14] and Singh [15] in the setting of nonstarshaped domain. .
A generalized commutativity theorem for pk-quasihyponormal operators
Authors: Duggal B.P.
Published: September 2009

For Hilbert space operators A and B, let ?AB denote the generalized derivation ?AB(X) = AX - XB and let /\AB denote the elementary operator rAB(X) = AXB-X. If A is a pk-quasihyponormal operator, A ? pk - QH, and B*is an either p-hyponormal or injective dominant or injective pk - QH operator (resp., B*is an either p-hyponormal or dominant or pk - QH operator), then ?AB(X) = 0 =? SA*B*(X) = 0 (resp., rAB(X) = 0 =? rA*B*(X) = 0). .
On some characterizations of vividly and blurry (l,2)-β-irresolute mappings
Authors: Ponmani Athisaya , Rajeswari Raja , Thivagar Lellis , Ekici Erdal
Published: September 2009

The aim of this paper is to introduce and characterize the vividly (1, 2)-?-irresolute mapping and blurry (1, 2)-?-irresolute mapping. We also define (1, 2)-?-T2 spaces and (1, 2)-semi-preregular spaces. These spaces are characterized by a new class of open sets, called (1,2)-semipre-?-open sets. .
On fuzzy generalized α-closed set and its applications
Authors: Daraby Bayaz , Nimse S.B.
Published: September 2009

In this paper, we define and study fuzzy generalized ?-closed sets and r-open sets of a given L-fuzzy topological space and prime element r ? P(L) and coprime element a ? M(L). The concept of L-fuzzy r-open sets was introduced in [10], and it was proved that all r-open sets for L-fuzzy topological space form a new L-fuzzy topology, which is called stratiform L-fuzzy topology. Making use of the fuzzy generalized ?-closed sets, fuzzy generalized ?-continuous map is presented. .
Rigidity of toroid formed by revolution of parallelogram
Authors: Velimirovic Ljubica , Rancic Svetozar
Published: September 2009

One of the main tasks of the deformation theory is to point out to the rigid and flexible surfaces. In this paper we signify a torus like class of surfaces generated by parallelogram in ?3. It is proved that this class is rigid due to infinitesimal bending. Infinitesimal bending of generated surfaces is considered using Cohn-Vossen's method. .
Divergent Cesaro means of Fourier expansions with respect to polynomials associated with the measure
Authors: Fejzullahu Bujar
Published: September 2009

We prove that, for certain indices of 6, there are functions whose Cesaro means of order 5 of the Fourier expansion with respect to the polynomials associated with the measure (1 - ?)?(l + ?)? + MAr, where At is the delta function at a point t, are divergent almost everywhere on [-1,1]. We follow Meaney's paper (2003), where divergent Cesaro and Riesz means of Jacobi expansions were proved. .
On univalent functions with negative coefficients by using generalized Sâlâgean operator
Authors: Juma Rahman , Kulkarni S.R.
Published: September 2009

In this paper we have introduced a subclass AR(n, ?, ?, ?, ?) of univalent functions with negative coefficients defined by Salagean operator D?. We have obtained sharp results for coefficient estimates, distortion and closure bounds, Hadamard product and other results. .
On nonlinear discontinuous two-point boundary value problems for third order differential equations
Authors: Murty M.S.N. , Kumar Suresh
Published: September 2009

In this paper we prove existence of weak extremal solutions for third order nonlinear discontinuous two-point boundary value problems. Further, we obtain two weak differential inequalities for proving boundedness and uniqueness of solutions of related boundary value problems. .
On green function for the free particle
Authors: Dimitrijevic Dejan , Djordjevic Goran , Nesic Ljubisa
Published: September 2009

Application of the p-adic analysis and Green function in relativistic quantum theory is considered. Integrability of the free relativistic particle model is discussed. A convenient gauge is fixed. The Green function, as a corresponding propagator, are calculated in 4-dimensional p-adic Minkowski space. For this model, detailed calculation is performed for all three different cases: p ? l(mod)4, p ? 3(mod)4 and p = 2. .
Almost convergence and some matrix transformations
Authors: Qamaruddin Q , Mohiuddine S.A.
Published: September 2009

In this paper we characterize the matrix classes (l(p, u),??) and (l(p, u), ?) which generalize the matrix classes given by Mursaleen [6]. .
The numerical range of linear operators
Authors: Mecheri Salah
Published: September 2009

We offer a simple proof that convexoid operators on Hilbert space are normaloid, and given an example to show that the converse fails. .
On the simultaneous improving k inclusion disks for polynomial zeros
Authors: Milosevic Dusan , Petkovic Miodrag
Published: September 2009

A modification of the iterative method of B?rsch-Supan type for the simultaneous inclusion of polynomial zeros is considered. The modified method provides the simultaneous inclusion of k (of n ? k) zeros, dealing with k inclusion disks of these zeros and the point (unchangeable) approximations to the remaining n - k zeros. It is proved that the R-order of convergence of the considered method is two if k < n and three if k = n. Three numerical examples are given to illustrate convergence properties of the presented method. .
A common fixed point theorem in probabilistic metric space using implicit relation
Authors: Kumar Suneel , Pant B.D.
Published: September 2009

In this paper, we prove a common fixed point theorem in a probabilistic metric space by combining the ideas of pointwise R-weak commutativity and reciprocal continuity of mappings satisfying contractive conditions with an implicit relation. .
An example of using star complements in classifying strongly regular graphs
Authors: Milosevic Marko
Published: September 2009

In this paper we show how the star complement technique can be used to reprove the result of Wilbrink and Brouwer that the strongly regular graph with parameters (57, 14, 1, 4) does not exist. .
On DS*-sets and decompositions of continuous functions
Authors: Ekici Erdal , Jafari Saeid
Published: September 2009

In this paper, the notions of DS*-sets and DS*-continuous functions are introduced and their properties and their relationships with some other types of sets are investigated. Moreover, some new decompositions of continuous functions are obtained by using DS*-continuous functions, DS-continuous functions and D-continuous functions. .
Three-point boundary value problems for singular system of first order differential equations
Authors: Murty M.S.N. , Appa Rao , Kumar G.S. , Prasad K.A.S.N.V.
Published: September 2009

In this paper we prove existence and uniqueness results to three point boundary value problems associated with singular system of first order differential equations by the use of generalized inverses of matrices. .
Common fixed point theorems for occasionally weakly compatible mappings via implicit relations
Authors: Aliouche Abdelkrim , Popa Valeriu
Published: September 2009

We prove common fixed point theorems for four mappings satisfying implicit relations in symmetric spaces using the concept of occasionally weakly compatible mappings. Our Theorems generalize results of [1], [3], [4] and [7]. .
Finding minimum cost spanning tree on bidirectional linear systolic array
Authors: Milovanovic E.I. , Milovanovic I.Z. , Randjelovic B.M. , Bekakos M.P.
Published: September 2009

In this paper a bidirectional linear systolic array (BLSA) that computes minimum cost spanning tree (MCST) of a given graph is designed. We present a synthesis procedure, based on data dependencies and space-time transformations of index space, to design BLSA with optimal number of processing elements (PEs) for a given problem size. The execution time is minimized for that number of PEs. Explicit mathematical formulas for systolic array synthesis are derived. We compare performances of the BLSA with the unidirectional linear systolic array (ULSA). .
Numerical range and orthogonality in normed spaces
Authors: Bachir A. , Segres A.
Published: September 2009

Introducing the concept of the normalized duality mapping on normed linear space and normed algebra, we extend the usual definitions of the numerical range from one operator to two operators. In this note we study the convexity of these types of numerical ranges in normed algebras and linear spaces. We establish some Birkhoff-James orthogonality results in terms of the algebra numerical range V (T)A which generalize those given by J.P. William and J.P. Stamplfli. Finally, we give a positive answer of the Mathieu's question. .
Vector inequalities for powers of some operators in Hilbert spaces
Authors: Dragomir S.S.
Published: September 2009

Vector inequalities for powers of some operators in Hilbert spaces with applications for operator norm, numerical radius, commutators and self-commutators are given. .
Bi-lipschicity of quasiconformal harmonic mappings in the plane
Authors: Manojlovic Vesna
Published: September 2009

We show that quasiconformal harmonic mappings on the proper domains in R2 are bi-Lipschitz with respect to the quasihyperbolic metric. .
On certain classes of harmonic P-valent functions by applying the Ruscheweyh derivatives
Authors: Ebadian A. , Tehranchi A.
Published: September 2009

In this paper we have introduced two new classes HRp(?, ?, k, v),HRp(?, ?, k, v) of complex valued harmonic multivalent functions of the form f = h+g, where h and g are analytic in the unit disk ? = {z: |z| < 1} and f(z) satisfying the condition Re (1-?)Df+ ?(1-k)(Df)'+ ?k(Df)''> ? A sufficient coefficient condition for this function in the class HRp(?, ?, k, v) and a necessary and sufficient coefficient condition for the function f in the class HRp(?, ?, k, v) are determined. We investigate inclusion relations, distortion theorem, extreme points, convex combination and other interesting properties for these families. .
Scattered data points best interpolation as a problem of the best recovery in the sense of Sard
Authors: Danailova Natasha
Published: September 2009

The problem of the best recovery in the sense of Sard of a linear functional Lf on the basis of information T(f) = {Ljf,j = 1, 2,... N} is studied. It is shown that in the class of bivariate functions with restricted (n,m) -derivative, known on the (n,m)-grid lines, the problem of the best recovery of a linear functional leads to the best approximation of L(KnKm) in the space S = span Lj(Kn_Km), j=1; 2,...N}, where Kn(x,t) = K(x,t)- Lxn(K(.,t):x) is the difference between the truncated power kernel K(x,t) = (x-t)n-1+ =(n-1)! and its Lagrange interpolation formula. In particular, the best recovery of a bivariate function is considered, if scattered data points and blending grid are given. An algorithm is designed and realized using the software product MATLAB.
Design of regulated ford on the roads of low traffic intensity at the crossing of torrential flows
Authors: Djekovic Vojislav , Stefanovic Bogdan
Published: September 2009

Regulation works in small torrential streams disturb the natural flow regime and the structure of banks and riparian area. The streams are crossed by bridges and culverts. However, at places of low traffic intensity, natural fords are often used for crossing. A regulated ford is constructed by lining and protection of the natural ford, where due to reduced roughness in the ford zone, hydraulic characteristics of the stream show a series of specificities This paper presents the method of calculation of hydraulic factors, which determine the conditions of regulated ford. The construction of regulated ford, as a civil engineering structure, is designed in the conditions enabling a safe traffic at low and medium discharges, while at high water levels there are no obstacles to the flow of water and torrential sediment .
Host plant effect on the susceptibility of gypsy moth caterpillars to insecticides
Authors: Milanovic Slobodan
Published: September 2009

Gypsy moth (Lymantria dispar L) is the most significant pest of broadleaf forests. The dynamics of gypsy moth population depends on several biotic and abiotic factors, but it is also highly dependent on the quality of consumed food. The gypsy moth control increasingly relies on the biological preparations based on Bacillus thuringiensis subspec. kurstaki (Btk) and Lymantria dispar Nuclear Poliedrosis virus (NPV). Chemical preparations are still applied although more rarely, the pyrethroids which include also lambda-cyhalothrin This paper presents the study results of the effect of host plant on gypsy moth caterpillar (Lymantria dispar L) susceptibility to lambda cihalotrine insecticide, by which the study oak leaves were contaminated. The study results show the lowest mortality of the caterpillars fed on contaminated leaves of Turkey oak (17.5%), then pedunculate oak (86.1%), and the highest mortality of caterpillars fed on sessile oak leaves (92%). The rate of the gypsy moth caterpillar development depends on the host plant Susceptibility of the gypsy moth caterpillars to the above preparation depends on the host plant The knowledge of the effect of host plant on insecticide efficiency in gypsy moth suppression would render insecticide utilisation optimal.
Reliability of information on the growing stock as the base of real forest management planning
Authors: Bankovic Stanisa , Medarevic Milan , Pantic Damjan
Published: September 2009

The reliability of information on the growing stock state is the basic prerequisite of real forest management plans. In this sense, practical works on forest management, including data processing, which creates the information base in forestry, should be carried out in the most correct way, disregarding the numerous problems (subjective and objective) which result from the conditions in which the works are performed. Improvisations in any phase of the works, as illustrated by the example presented in this paper, create a wrong idea on the forest state, which further results in unreal and inadequate forest management plans. In all situations in which the data in plan documents do not agree with the real forest state, disregarding the increased financial expenditures, the works on forest management should be revised and plan documents should be made. In this way, we eliminate the potential consequences which would result from the realisation of the planed works based on unreal forest state, which would be reflected both in the economic and in the ecological senses, without the possibility to remove the consequences in a short time period.
Observation of underground water level in the area of forest estate "Sremska Mitrovica " during 2000 and 2001
Authors: Djorovic Miroljub , Letic Ljubomir
Published: September 2009

Observation of underground water level in the area of "Jasensko-Belilo", which belongs to the Forest Estate "Sremska Mitrovica", started in 1999. The measurements were performed by means of 2 piezometers set up approximately perpendicularly to the river Sava, forming profile number 1 (Fig.1). The results of these measurements (Fig. 2, 3) show a significant lowering of groundwater level in 2000. The reason is most likely the unfavorable rainfall amount and distribution during that year (Table 2). A much better situation was during 2001 when the minimal groundwater level was up to 2 meters and it was considered to be the result of a favorable amount of rainfall and its distribution during the year (Tables 2, 3). It was noticed that Carpinus betulus appears instead of flowering ash (Fraxinus ornus), which is a good sign that generally the level of underground water is lowering. Also, the phenomenon that pedunculate oak (Quercus robur) gradually loses its natural regeneration capability also confirms the trend of lowering underground water level. If this trend continues, oak will be in a very near future naturally substituted by less valuable species, probably Turkey oak (Quercus cerris). If groundwater wells along the river Sava reach the vicinity of this area, which is a plan for the Belgrade city water supply, the trend of groundwater table lowering will be even more expressed and it will certainly endanger the existence of all valuable forest species in this area.
Investigation of process of interception in beech-fir stand on mountain Goch
Authors: Ristic Ratko , Macan Grigorije
Published: September 2009

Part of the precipitation is intercepted by vegetation before reaching the ground. The portion of intercepted water, which is retained in storage of the vegetal cover and evaporates, is called the interception loss. Interception represents important component of water balance, because of reduction of total rainfall. It decreases potential for forming of surface runoff. Depends on complex of vegetative and climate factors. In humid forested regions about 25% of the annual precipitation may become interception loss. Results of investigation in beech-fir stand on mountain Goch are presented in this paper Investigation was carried out on experimental catchment area Vaona IV (A=0.098 km2), in association Abieti-fagetum, on mountain Goch, in Central Serbia. Standard rain gauges were used to determine total precipitation and throughfalls, during vegetation period (1992-1997). Total interception (Ic) depends on total precipitation (Pb), kind of trees, shape and density of the crown, position in the stand and age. Average values of interception (Icsr) during vegetation period (1992-1997), amount to Icsr=43.7-53.3% of total precipitation (fir), and Icsr=17.7-22.8% (beech).
Seed dormancy and germination: Mechanisms, classifications and practices
Authors: Grbic Mihailo
Published: September 2009

Delayed germination, which results from various types of seed dormancy, and presowing treatments for overcoming dormancy is dealt with. In the present nursery practice in Serbia and Montenegro, some of the described treatments are completely unknown. Special attention is paid to the implications of new methods, such as naked stratification, phytohormone treatments, fire simulation etc.
Evaluation of beech stand condition based on the basic growth elements
Authors: Vuckovic Milivoj , Stajic Branko
Published: September 2009

The state of a beech stand is analyzed from the aspect of stability and production level. The arguments are presented for the need of the objective definition of the stand condition by the criteria based on the characteristics of stand growth elements. This contributes to integral management procedures and their verification in the aim of optimal and stabile production. The study results show that there can be significant deviations from the optimal stand condition regarding the number of trees crown development, taper and diameter increment, which are not perceptible to the eye until the visible signs of tree revitalization when the damage cannot be repaired.
Vegetation as one of the factors of morphological changes in regulated riverbeds
Authors: Djekovic Vojislav , Ristic Ratko
Published: September 2009

Morphological changes of natural and regulated riverbeds have strong influence on economy development in the zones close to the riverbanks. Understanding of these processes and possibility of prediction are the basis for safe usage of areas close to the riverbanks. River Toplica bed regulation is chosen as experimental section for investigation of morphological changes. Steady survey profiles were established after finishing the regulation works, as basic points for further observations of changes in the riverbed. Water level recorder was positioned a few hundred meters down the stream. Main causes for morphological development along the riverbed were determined on the basis of changes in geometry of cross-section profiles and water level. Influence of vegetation cover in the riverbanks and hydro-dynamic characteristics of the flow have been analyzed.
Some clastic rocks as parent rocks in beech forests of Brezovica - Juzni Kucaj
Authors: Joksimovic Vesna , Gajic Bojan
Published: September 2009

On the large forest areas, where the measures of soil quality improvement are absent or rarely undertaken, the rocks are the sources of a great number of elements in plant nutrition and one of the factors affecting the contents of some elements in plants. The aim of the study is to determine the differences in the contents of Cu, Zn, Mn, Ni, Fe, Cd, Co, Pb and Cr in the beech leaves developed in the same climate conditions, on morphologically similar terrains, composed of different types of sedimentary rocks. This paper presents the study results of the contents of the above elements in argillites, sandstones (grauwackes) and microconglomerates occurring as the parent rocks in high beech forests in the region of GJ Bogovina (Brezovica Juzni Kucaj and in the leaves of beech developed on these rocks.
Properties and production potential of cambic soils on andesite rocks in beech forests on Crni Vrh near Bor
Authors: Kosanin Olivera , Knezevic Milan
Published: September 2009

Cambic soils were studied in the mountainous beech forest (Fagetum moesiacae montanum, Jov. 1976) (Tomic, 1992) in the region of the mountainous massif Crni Vrh near Bor. The soils were researched in two sample plots. The study soils were formed on andesite rocks in the monodominant community of beech and now they are under a strong impact of acid deposition pollutants which reach the zone of Crni Vrh from RTB Bor.
The research of some physical properties of wood Paulownia elongata and Paulownia fortuneii
Authors: Soskic Borislav , Lovric Aleksandar , Vukovojac Boda
Published: September 2009

The density, shrinkage and swelling of Paulownia elongata and P. fortuneii wood were researched. The study material was provided by Boda Vukovojac, B. Sc., who established the Paulownia plantation and sample plots on the territory of the Municipality Bela Crkva. The study results show the differences between the analyzed properties of these two species. The study results were also compared with the results of the similar species of wood. The data shows that the study wood can be used in wood products that are not subject to great loads during exploitation. Further study should investigate the liability of these wood species to form tension wood and deformations in the conditions of variable hygroscopic moisture.
Biological differentiation of trees in beech stands and its significance for tending operations
Authors: Bobinac Martin
Published: September 2009

The characteristics of biological differentiation of trees are analyzed in medium-aged beech stands in similar site conditions and their effect on tending operations. The stands are similar by origin and by age of dominant trees, but they differ significantly by the characteristics of growth elements. The regularity of biological differentiation of trees in stands is the base of the selection adapted to natural processes, such as selection thinning. The primary objective of tending to achieve optimal and stable production should be defined only for the dominant trees whose number in the study stands is 700-1000 trees per ha or 18. 1-29. 9% of the total number of trees. In the initial relations of biological differentiation, the codominant and overtopped trees have only the secondary role from the silvicultural aspect.
The most frequent 'rusts' on trees and shrubs in Serbia
Authors: Karadzic Dragan , Milijasevic Tanja
Published: September 2009

This paper describes 15 species of fungi in the order Uredinales, causing the diseases known as "rusts". These fungi develop as obligate parasites and cause very dangerous diseases on cultivated plants. Among the "rusts" occurring on the trees, the following rusts are of special economic significance Melampsorella caryophyllacearum (rust on fir), Cronartium flaccidum (rust on two-needle pines) and Melampsora species (rusts on poplars). Fungi Chrysomyxa pirolata, Pucciniastrum epilobii, Gymnosporangium clavariiforme and G. tremelloides have been identified for the first time in Serbia.
Functional diploidisation and natural and artificial evolution of trees
Authors: Tucovic Aleksandar , Isajev Vasilije , Sijacic-Nikolic Mirjana
Published: September 2009

The knowledge of trees at the beginning of the 21st century cannot be compared to that in the early fifties of the 20th century. Trees are characterized by longevity, adaptation, high variability, very complex organization, not only morphological, anatomical, physiological, but also at the genetic level. The effect of functional diploidisation of woody polyploids on genetic organization of actual diploids (secondary, tertiary and quaternary) has been dealt with. The process of diploidisation has a huge evolution and technological potential.
Diversity of Lophodermium species on pines
Authors: Lazarev Vladimir
Published: September 2009

Multiannual study of needle-cast disease on pines shows that Lophodermium species, as well as other widely-ranging micro-organism species, are characterized by high variability in morphology, physiology, biology pathogenic characters, epiphytotiology and other characteristics, which points to the assumption on the existence of biotypes, forms or still unidentified species in this genus. This paper presents the study results which contribute to the elucidation of the confusion regarding the genus name Lophodermium and the species, biotypes or forms described in the genus.