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Search Results: 1 - 10 of 395482 matches for " U. Rüde "
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Psychological Capital and Job Performance: The Mediating Role of Work Attitudes  [PDF]
U. W. M. R. Sampath Kappagoda, Hohd Zainul Fithri Othman, Gamini De Alwis
Journal of Human Resource and Sustainability Studies (JHRSS) , 2014, DOI: 10.4236/jhrss.2014.22009
Abstract: The purpose of this study was to investigate the relationships among Psychological Capital (PsyCap), work attitudes and job performance of the employees in the banking sector in Sri Lanka. The sample consisted of 176 managers and 357 non-managerial employees. A questionnaire was administered among the employees as the measuring instrument. The collected data were analyzed using correlation coefficient and regression. The results of the study indicated that there was a significantly positive relationship between PsyCap and job performance, PsyCap and work attitudes, work attitudes and job performance. Work attitudes were found to mediate the relationship between PsyCap and job performance of the employees in the banking sector in Sri Lanka.
Induced self-energy on a static scalar charged particle in the spacetime of a global monopole with finite core
D. Barbosa,U. de Freitas,E. R. Bezerra de Mello
Physics , 2010, DOI: 10.1088/0264-9381/28/6/065009
Abstract: We analyze the induced self-energy and self-force on a scalar point-like charged test particle placed at rest in the spacetime of a global monopole admitting a general spherically symmetric inner structure to it. In order to develop this analysis we calculate the three-dimensional Green function associated with this physical system. We explicitly show that for points outside the monopole's core the scalar self-energy presents two distinct contributions. The first one is induced by the non-trivial topology of the global monopole considered as a point-like defect and the second is a correction induced by the non-vanishing inner structure attributed to it. For points inside the monopole, the self-energy also present a similar structure, where now the first contribution depends on the geometry of the spacetime inside. As illustrations of the general procedure adopted, two specific models, namely flower-pot and the ballpoint-pen, are considered for the region inside. For these two different situations, we were able to obtain exact expressions for the self-energies and self-forces in the regions outside and inside the global monopole.
Gravitating Magnetic Monopole in the Global Monopole Spacetime
J. Spinelly,U. de Freitas,E. R. Bezerra de Mello
Physics , 2002, DOI: 10.1103/PhysRevD.66.024018
Abstract: In this paper we study the regular self-gravitating 't Hooft-Polyakov magnetic monopole in a global monopole spacetime. We show that for the large distance, the structure of the manifold corresponds to the Reissner-Nordstr\"{o}m spacetime with a solid angle deficit factor. Although we analyze static and spherically symmetric solutions, it is not possible to solve analytically the system of coupled differential equations and only numerical evaluations can provide detailed information about the behavior of this system at the neighborhood of the defect's core. So, for this reason we solve numerically the set of differential equations for the metric tensor and for the matter fields for different values of the Higgs field vacuum expectation value, $\eta$, and the self-coupling constant, $\lambda$.
Pervapora??o: uma técnica de separa??o contínua n?o-cromatográfica
Mattos, Ivanildo Luiz de;Queiroz, Rold?o R. U.;
Química Nova , 1998, DOI: 10.1590/S0100-40421998000200016
Abstract: a brief discussion of the non-chromatographic continuous separation techniques is presented emphasizing the pervaporation process. it makes interesting choices for implementing various preliminary operations of the analytical process in order to accommodate the raw sample to the measuring instrument. discussions include the perceived advantages and disadvantages, the underlying principles of pervaporation process, the flexible module and fields of application.
Determinación de las características morfofisiológicas asociadas con el rendimiento en 15 líneas de cebada (Hordeum vulgare L.)
Corchuelo R. Germán,Cruz U. Ramiro de la
Agronomía Colombiana , 1984,
Abstract: Los estudios fisiológicos indican que una alta producción de grana en cebada se alcanza cuando se tienen una debida interacción de variedad, ambiente y manejo agronómico. Convencionalmente, en los programas de mejoramiento de este cereal en Colombia, se han obtenido variedades mejoradas que superan cada vez más los rendimientos de grana por hectárea.
Pervapora o: uma técnica de separa o contínua n o-cromatográfica
Mattos Ivanildo Luiz de,Queiroz Rold?o R. U.
Química Nova , 1998,
Abstract: A brief discussion of the non-chromatographic continuous separation techniques is presented emphasizing the pervaporation process. It makes interesting choices for implementing various preliminary operations of the analytical process in order to accommodate the raw sample to the measuring instrument. Discussions include the perceived advantages and disadvantages, the underlying principles of pervaporation process, the flexible module and fields of application.
Acoustic emission (AE) as a diagnostic tool in geophysics
G. Paparo,G. P. Gregori,U. Coppa,R. De Ritis
Annals of Geophysics , 2002, DOI: 10.4401/ag-3511
Abstract: Acoustic Emissions (AE) are effective for monitoring ground deformation and temporal variation of its porosity. AE are complementary to seismic information, related to the same area, though AE and earthquakes focus on observational evidence concerned with substantially different space- and time-scales. AE information is pertinent (i) either for geodynamically stable areas, where it probes the diurnal thermal and/or tidal deformation, (ii) or for seismic areas where it provides some as yet unexploited precursors, (iii) or for volcanic areas, where it appears capable of recognising precursors originated by some hot fluid that penetrates by diffusion into rock pores, from those associated with eventual plutonic magma intrusions, (iv) and also for monitoring periods of time during which a volcano is inflated by underground hot fluids compared to others during which it deflates . Upon direct comparison between 6 data sets concerned with different physical settings, it seems to be possible (fig. 3 and table II] to distinguish a few significantly different behaviours associated either (i) with a mere compression (such as it occurs for Stromboli, Vesuvius, and a sample compressed in the laboratory), or (ii) with a slip strain, such as it typically occurs in association with faulting or with diurnal thermal rock deformation.
On the Conharmonic Curvature Tensor of Generalized Sasakian-Space-Forms
U. C. De,R. N. Singh,Shravan K. Pandey
ISRN Geometry , 2012, DOI: 10.5402/2012/876276
Abstract:
On the Conharmonic Curvature Tensor of Generalized Sasakian-Space-Forms
U. C. De,R. N. Singh,Shravan K. Pandey
ISRN Geometry , 2012, DOI: 10.5402/2012/876276
Abstract: The object of the present paper is to characterize generalized Sasakian-space-forms satisfying certain curvature conditions on conharmonic curvature tensor. In this paper we study conharmonically semisymmetric, conharmonically flat, -conharmonically flat, and conharmonically recurrent generalized Sasakian-space-forms. Also generalized Sasakian-space-forms satisfying and have been studied. 1. Introduction Conformal transformations of a Riemannian structures are an important object of study in differential geometry. Of considerable interest in a special type of conformal transformations, conharmonic transformations, which are conformal transformations are preserving the harmonicity property of smooth functions. This type of transformation was introduced by Ishii [1] in 1957 and is now studied from various points of view. It is well known that such transformations have a tensor invariant, the so-called conharmonic curvature tensor. It is easy to verify that this tensor is an algebraic curvature tensor; that is, it possesses the classical symmetry properties of the Riemannian curvature tensor. Let and be two Riemannian manifolds with and being their respective metric tensors related through where is a real function. Then and are called conformally related manifolds, and the correspondence between and is known as conformal transformation [2]. It is known that a harmonic function is defined as a function whose Laplacian vanishes. A harmonic function is not invariant, in general. The conditions under which a harmonic function remains invariant have been studied by Ishii [1] who introduced the conharmonic transformation as a subgroup of the conformal transformation (1.1) satisfying the condition where comma denotes the covariant differentiation with respect to metric . A rank-four tensor that remains invariant under conharmonic transformation for -dimensional Riemannian manifold is given by where and denote the Riemannian curvature tensor of type defined by and the Ricci tensor of type , respectively. The curvature tensor defined by (1.3) is known as conharmonic curvature tensor. A manifold whose conharmonic curvature tensor vanishes at every point of the manifold is called conharmonically flat manifold. Thus this tensor represents the deviation of the manifold from canharmonic flatness. Conharmonic curvature tensor has been studied by Abdussattar [3], Siddiqui and Ahsan [2], ?zgür [4], and many others. Let be an almost contact metric manifold equipped with an almost contact metric structure . At each point , decompose the tangent space into the direct sum ,
Robust PCA and MIC statistics of baryons in early mini-haloes
R. S. de Souza,U. Maio,V. Biffi,B. Ciardi
Physics , 2013, DOI: 10.1093/mnras/stu274
Abstract: We present a novel approach, based on robust principal components analysis (RPCA) and maximal information coefficient (MIC), to study the redshift dependence of halo baryonic properties. Our data are composed of a set of different physical quantities for primordial minihaloes: dark-matter mass ($M_{\mathrm{dm}}$), gas mass ($M_{\mathrm{gas}}$), stellar mass ($M_{\mathrm{star}}$), molecular fraction (${\mathrm{x_{mol}}}$), metallicity ($Z$), star formation rate (SFR) and temperature. We find that $M_{\mathrm{dm}}$ and $M_{\mathrm{gas}}$ are dominant factors for variance, particularly at high redshift. Nonetheless, with the emergence of the first stars and subsequent feedback mechanisms, ${\mathrm{x_{mol}}}$, SFR and $Z$ start to have a more dominant role. Standard PCA gives three principal components (PCs) capable to explain more than 97 per cent of the data variance at any redshift (two PCs usually accounting for no less than 92 per cent), whilst the first PC from the RPCA analysis explains no less than 84 per cent of the total variance in the entire redshift range (with two PCs explaining $ \gtrsim 95$ per cent anytime). Our analysis also suggests that all the gaseous properties have a stronger correlation with $M_{\mathrm{gas}}$ than with $M_{\mathrm{dm}}$, while $M_{\mathrm{gas}}$ has a deeper correlation with ${\mathrm{x_{mol}}}$ than with $Z$ or SFR. This indicates the crucial role of gas molecular content to initiate star formation and consequent metal pollution from Population III and Population II/I regimes in primordial galaxies. Finally, a comparison between MIC and Spearman correlation coefficient shows that the former is a more reliable indicator when halo properties are weakly correlated.
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