bluuebunny/crossref_metadata_2025_split huggingface dataset:
Palaeoenvironmental evolution of the Southern Alps across the Faraoni Level equivalent: new data from the Trento Plateau (Upper Hauterivian, Dolomites, N. Italy)
Authors: Lukeneder Alexander , Grunert Patrick 
Published: April 2013

Abstract
Lukeneder, A. and Grunert, P. 2013. Palaeoenvironmental evolution of the Southern Alps across the Faraoni Level equivalent: new data from the Trento Plateau (Upper Hauterivian, Dolomites, N. Italy). Acta Geologica Polonica, 63 (1), 89-104. Warszawa. New stratigraphic and palaeoenvironmental data are presented for the northeastern part of the Trento Plateau (Puez area, Southern Alps, Italy). The studied section corresponds to the upper Hauterivian Balearites balearis and “Pseudothurmannia ohmi” ammonite zones and normal palaeomagnetic chron upper M5. A c. 30-cm-thick bed is identified as the equivalent of the Faraoni Level, based on its position within the Pseudothurmannia mortilleti Subzone, the composition of its ammonite fauna and the peak of a minor positive trend in the δ 13 C bulk record. Microfacies and geochemical proxies compare well with those of the southeastern part of the Trento Plateau and indicate palaeoceanographic continuity along the eastern margin of the plateau. The abundances of radiolarians and nannoconids suggest a turnover in the trophic structure from eutrophic conditions around the Faraoni Level equivalent to oligotrophic conditions. Low organic matter and sulphur content and frequent bioturbation indicate a well-oxygenated environment. Ammonite diversity and life-habitat groups document the influence of sea level on the plateau: while epi- and mesopelagic ammonites occur commonly during sea-level highstands, all life-habitat groups become reduced during a sea-level lowstand in the Spathicrioceras seitzi and P. ohmi subzones. The Faraoni event is heralded by a faunal turnover expressed as the diversification of epipelagic ammonites. Palaeoenvironmental conditions along the eastern margin of the Trento Plateau during the Faraoni event contrast with those of the organic-rich black shales in the west. A re-evaluation of the depositional model based on the new results suggests a general water depth of 300-500 m for the plateau. The severe reduction of mesopelagic ammonites during the sea-level lowstand indicates a shallowing towards the epi-/mesopelagic boundary. During the Faraoni event, the eastern areas of the Trento Plateau were located at the upper limit of the oxygen-minimum layer and were thus only occasionally affected by oxygen depletion, whereas the western areas were located well within the upper part of the oxygen-depleted layer.
Calcareous plankton bio-chronostratigraphy of the Maltese Lower Globigerina Limestone member
Authors: Baldassini Niccolo’ , Mazzei Roberto , Foresi Luca Maria , Riforgiato Federica , Salvatorini Gianfranco 
Published: April 2013

Abstract
Baldassini, N., Mazzei, R., Foresi L.M., Riforgiato, F. and Salvatorini, G. 2012. Calcareous plankton bio-chronostratigraphy of the Maltese Lower Globigerina Limestone member. Acta Geologica Polonica, 63 (1), 105-135. Warszawa. The planktonic foraminifera and calcareous nannofossil biostratigraphy of the Maltese Lower Globigerina Limestone member has been investigated. The member was dated to early planktonic foraminiferal P22 Zone and nannofossil NP25 Zone (upper Chattian). A climate-stratigraphic approach, based on the quantitative analyses of calcareous nannofossils, was used additionally to achieve a more precise chronology. The species Coccolithus pelagicus (diameter £11 μm) and the genus Umbilicosphaera were selected for the recognition of cold and warm surface waters intervals respectively. The ratio of their percentages enabled the construction of a Climatic Factor (CLF) curve. The CLF values were consistent with a warm climatic phase, which is probably represented by the portion of the oxygen stable isotope curve of Miller et al. above the Oi2c event and below the beginning of the cooling trend that culminates in the Mi1 event. Considering these two climatic events and the upper boundary of the NP25 Zone, it can be inferred that the deposition of the Lower Globigerina Limestone member took place between 25.1 and 24.3 Ma.
Nitrogen Uptake and Free Amino-acid Accumulation in Roots of Lotus corniculatus Cultivars under Al-stress
Authors: Palove-Balang Peter , Murinova Anna , Zelinova Veronika 
Published: April 2013

Abstract Nitrogen uptake and free amino acid accumulation was evaluated in two South American cultivars of Lotus corniculatus L. differing in their tolerance to Al stress. The uptake of nitrate was affected by 1 mM Al more in the sensitive cultivar INIA Draco than in a relatively tolerant UFRGS (the uptake rate was 39.1% and 52.9%, respectively, of the control value at pH=5.5), whereas the opposite was true for the uptake of ammonia (60.1% and 50.1%). Treatment with Al also decreased the free amino-acid level to similar extent in both cultivars, mostly due to the significantly decreased level of asparagine (p = 0.003 and 0.026, respectively), the dominant amino-acid in Lotus roots. On the other hand, accumulation of stress metabolite - proline was achieved that was up to 5 time higher than in control. No considerable differences in this accumulation in INIA Draco and in UFRGS were found, so it is rather unlikely that proline content could contribute to the differences in Al-tolerance between the cultivars.
Effect of Changes in Behaviour on the Heart Rate and its Diurnal Variation in a Male and a Female Eland (Taurotragus oryx)
Authors: Zizkova Katerina , Kotrba Radim , Kocisova Alica 
Published: April 2013

Abstract Heart rate (HR) is related to the physiological state of most of vertebrates, e.g. the level of metabolism, motion or stress. In previous reports, the HR of eland was measured during sedation and general anaesthesia. Therefore, we wanted to evaluate HR in alert eland with emphasis on variations by different behaviours and time of the day. We measured HR by Polar S610 device in an adult male and an adult female. Behaviour during recumbent and rumination, standing and rumination, standing, standing and eating, movement, excitement during feeding, stressful event, handling in restraint box and sleep were recorded and synchronised with data from HR device. In the male, HR was lowest during recumbency and rumination. In the female, HR was lowest during sleep. The highest HR was measured during handling in a restraint box. The HR was higher during the night for most of the behaviours. Further research should focus on explaining the diurnal variation in HR as it relates to specific behaviour.
Detecting Sex-Biased Gene Flow in African-americans Through the Analysis of Intra- and Inter-Population Variation at Mitochondrial DNA and Y- Chromosome Microsatellites
Authors: Battaggia C. , Anagnostou P. , Bosch I. , Brisighelli F. , Destro-Bisol G. , Capocasa M. 
Published: April 2013

ABSTRACT
This study reports on variations at the mitochondrial DNA (mtDNA) hypervariable region 1 (HVR-1) and at seven Y-chromosome microsatellites in an African-American population sample from Chicago, IL, USA. Our results support the hypothesis that the population studied had undergone a European malebiased gene flow. We show that comparisons of intraand inter-population diversity parameters between African-Americans, Europeans and Africans may help detect sex-biased gene flow, providing a complement to quantitative methods to estimate genetic admixture.
Association Between Obsessive Compulsive Disorder And Tumor Necrosis Factor-Α Gene –308 (G>A) And –850 (C>T) Polymorphisms In Turkish Children
Authors: Lüleyap H.U. , Onatoğlu D. , Tahiroğlu A.Y. , Alptekin D. , Yılmaz M.B. , Çetiner S. , Pazarbaşı A. , Ünal İ. , Avcı A. 
Published: April 2013

ABSTRACT Obsessive compulsive disorder (OCD) is a neurobiological disease characterized with obsessions and compulsions. Obsessive compulsive disorder occurs with an autoimmune mechanism after Group A β hemolytic streptococcus (GABHS) infection. Tumor necrosis factor (TNF) is an important cytokine, as well as having an important role in the apoptosis mechanism of autoimmune diseases. It is expressed by the TNF-α gene. The aim of this study was to examine the relationship between the TNF-α gene promoter region -308 (G>A) and -850 (C>T) polymorphisms and OCD. In this study, ages of the OCD patients and the control group ranged between 4 and 12 years. We studied two patient groups, one included childhood onset OCD patients (n = 49) and the control group was composed of healthy children (n = 58). Patients were diagnosed according to the Diagnostic and Statistical Manual of Mental Disorder (DSM-IV) criteria and with Kiddie Schedule for Affective Disorders and Schizophrenia-Present and Lifetime (KSAD-S-PL) version. For identifying the polyorphisms, polymerase chain reaction (PCR), restriction fragment length polymorphism (RFLP) and polyacrylamide gel electrophoresis (PAGE) methods were used.For the -308 polymorphism, 45 of 49 OCD patients’ results were completed, and for the -850 polymorphism, 47 of 49 OCD patients’ results were completed. According to our statistical results, there is a positive relationship between OCD and the -308 polymorphism (p <0.001) but no association between OCD and the -850 polymorphism (p = 0.053). There is no positive relationship between antistreptolysin O (ASO) titers and the -308 polymorphism (p = 0.953) but there is an important significance between the -850 polymorphism and ASO (p = 0.010). There is no positive relationship between gender of patients and OCD (p = 0.180) and no positive association between ASO and gender (p = 0.467). According to our results, we hypothesize that we can propose the mutant AA genotype for the -308 polymorphism, and that the mutant CT genotype for the -850 polymorphism may be used as molecular indicators for OCD.
Towards Autonomous Robotic Valve Turning
Authors: Carrera A. , Ahmadzadeh S. R. , Ajoudani A. , Kormushev P. , Carreras M. , Caldwell D. G. 
Published: April 2013

Abstract
In this paper an autonomous intervention robotic task to learn the skill of grasping and turning a valve is described. To resolve this challenge a set of different techniques are proposed, each one realizing a specific task and sending information to the others in a Hardware-In-Loop (HIL) simulation. To improve the estimation of the valve position, an Extended Kalman Filter is designed. Also to learn the trajectory to follow with the robotic arm, Imitation Learning approach is used. In addition, to perform safely the task a fuzzy system is developed which generates appropriate decisions. Although the achievement of this task will be used in an Autonomous Underwater Vehicle, for the first step this idea has been tested in a laboratory environment with an available robot and a sensor.
On Global Optimization of Walking Gaits for the Compliant Humanoid Robot, COMAN Using Reinforcement Learning
Authors: Dallali Houman , Kormushev Petar , Li Zhibin , Caldwell Darwin 
Published: April 2013

Abstract
In ZMP trajectory generation using simple models, often a considerable amount of trials and errors are involved to obtain locally stable gaits by manually tuning the gait parameters. In this paper a 15 degrees of Freedom dynamic model of a compliant humanoid robot is used, combined with reinforcement learning to perform global search in the parameter space to produce stable gaits. It is shown that for a given speed, multiple sets of parameters, namely step sizes and lateral sways, are obtained by the learning algorithm which can lead to stable walking. The resulting set of gaits can be further studied in terms of parameter sensitivity and also to include additional optimization criteria to narrow down the chosen walking trajectories for the humanoid robot.
Structured Information Extraction from Medical Texts in Bulgarian
Authors: Boytcheva Svetla 
Published: April 2013

Abstract
This paper presents an approach for Information Extraction (IE) from Patient Records (PRs) in Bulgarian. The specific terminology and lack of resources in electronic format are some of the obstacles that make the task of current patient status data extraction in a structured format quite challenging. The usage of N-grams, collocations and words’ distances allows us to cope with this problem and to extract automatically the attribute-value pairs with relatively high precision.
Difference Schemes with Nonlocal Boundary Conditions
Authors: Goolin Alexei V. , Ionkin Nikolai I. , Morozova Valentina A. 
Published: April 2013

AbstractThe paper deals with the stability, with respect to initial data, of
difference schemes that approximate the heat-conduction equation with constant coefficients and nonlocal boundary conditions. Some difference schemes are considered
for the one-dimensional heat-conduction equation, the energy norm is constructed, and
the necessary and sufficient stability conditions in this norm are established for explicit
and weighted difference schemes.
Improved Least-squares Error Estimates for Scalar Hyperbolic Problems
Authors: Bochev P.B. , Choi J. 
Published: April 2013

AbstractWe consider an L_2-norm least-squares principle for a scalar hyperbolic
problem. A proper variational framework for the associated finite element method is
developed and studied. Analysis of the discretization error based on the least-squares
projection property shows a gap of one. This number cannot be improved
with a standard duality argument because the least-squares dual does not possess full
elliptic regularity. Using a perturbed dual problem we are able to show that the actual
gap of the least-squares method in the constant convection case is not worse than 2/3.
Operator-splitting Schemes for Solving Unsteady Elasticity Problems
Authors: Lisbona Francisco J. , Vabishchevich Pert N. 
Published: April 2013

AbstractIn this paper we consider the numerical approximation of the solution
of the 2D unsteady Lame equations on a rectangular domain. The basic problems
that appear, using both finite difference and finite element methods, are connected
with the fact that these equations are strongly coupled. Thus it is natural to design
computational algorithms in such a way that they allow one to consider boundary
value problems only for uncoupled equations. To implement this general concept, some
special (unconditionally stable) operator-splitting schemes are constructed. Its major
peculiarity is that transition to the next time level is performed by solving separate
elliptic problems for each component of the displacement vector. The previous results
make it possible to design efficient numerical algorithms for elasticity equations.
Solution of a Finite-Dimensional Problem With M-mappings and Diagonal Multivalued Operators
Authors: Laitinen E. , Lapin Alexander 
Published: April 2013

AbstractThe existence of a solution of the finite-dimensional problem with continuous M-mappings and multivalued diagonal
maximal monotone operators on an ordered interval, which is formed by the so-called subsolution,
is proved. Under several additional assumptions on the
operators the monotone dependence of a solution upon the right-hand
side is investigated. This result implies, in particular, the uniqueness of a solution
and serves as a basis for the analysis of the convergence for a multisplitting iterative
method. As an illustrative example, the finite difference scheme approximating a model
variational inequality is studied by using the general results.
Convergence Of a Finite Difference Scheme for the Third Boundary-Value Problem for an Elliptic Equation with Variable Coefficients
Authors: Jovanović Boško S. , Popović Branislav Z. 
Published: April 2013

Abstract In this paper we study the convergence of a finite difference scheme that
approximates the third boundary-value problem for an elliptic equation with variable
coefficients on a unit square. An ”almost” second-order convergence rate estimate
(with additional logarithmic multiplier) is obtained.
Finite Difference Schemes for Convection-diffusion Problems with a Concentrated Source and a Discontinuous Convection Field
Authors: Linß Torsten 
Published: April 2013

AbstractA singularly perturbed convection-diffusion problem with a concentrated
source is considered. The problem is solved numerically using two upwind difference
schemes on general meshes. We prove convergence, uniformly with respect to the
perturbation parameter, in the discrete maximum norm on Shishkin and Bakhvalov
meshes. Numerical experiments complement our theoretical results.
Finite Difference Schemes for Poro-elastic ProblemS
Authors: Gaspar Francisco J. , Lisbona Francisco J. , Vabishchevich Petr N. 
Published: April 2013

AbstractIn this paper, we present a finite difference analysis of the consolidation
problem for saturated porous media. In the classical model, the behaviour of the
porous environment – fluid system is described by a set of equations for the unknown
vector displacements of the matrix skeleton and the fluid pressure. For simplicity we
consider a model problem with constant coefficients in a rectangular domain. A priori
estimates for the difference solution of the problem are obtained and on their basis the
convergence of two-level difference schemes is investigated.
Numerical Modelling of Heat and Magnetohydrodynamic Flows in a Finite Cylinder
Authors: Buikis Andris , Kalis Harijs 
Published: April 2013

AbstractThe distribution of electromagnetic fields, forces and temperatures
induced by a three- phase axially-symmetric system of electric current in a conducting
cylinder of finite length has been calculated. An original method was used to calculate
the mean values of electromagnetic forces. The magnetohydrodynamic (MHD) flow
of viscous incompressible liquid and distribution of temperature are obtained by the
finite-difference method, using monotonic finite difference schemes.
Mathematical and Numerical Study of an Industrial Scheme for Two-phase Flows in Porous Media under Gravity
Authors: Enchéry G. , Masson R. , Wolf S. , Eymard R. 
Published: April 2013

AbstractIn this paper, we consider a dead-oil model where the capillary pressure
is neglected. In a multidimensional space and for a phase-by-phase upstream weigthing
cell-centered finite volume scheme, we prove the pressure estimates, the existence of
solutions to the discrete equations and the stability of the saturation calculation. This
is done in the explicit case as well as in the implicit case. Some numerical tests show
the convergence of the scheme.
Monotone Schemes of a Higher Order of Accuracy for Differential Problems with Boundary Conditions of the Second and Third Kind
Authors: Matus Peter 
Published: April 2013

AbstractIn the present paper monotone difference schemes of the second order
of approximation and accuracy for differential boundary-value problems of the second
and third kind without using the basic differential equation at the domain of the
boundary are constructed. The main idea is based on the assumption of the existence
and uniqueness of a smooth solution in some sufficiently small neighborhood of the
definition domain of the problem and the use of only half-integer nodes of the grid
(boundary points are excluded from the calculated nodes). In this case, the boundary
conditions are directly approximated with the second order on a two-point stencil. If
we assume that the equation has a meaning at the boundary nodes as well, then in this
case monotone schemes of the fourth order of accuracy have been constructed. It is
shown that in the case of Neumann problem it is necessary to construct such computational
procedures, which are monotone and satisfy the grid maximum principle with
respect to the flow (of the first derivatives with respect to space variables).
Discontinuous Galerkin Discretization with Embedded Boundary Conditions
Authors: Hemker P. W. , Hoffman W. , Van Raalte M. H. 
Published: April 2013

AbstractThe purpose of this paper is to introduce discretization methods of discontinuous Galerkin type for solving second-order elliptic PDEs on a structured,
regular rectangular grid, while the problem is defined on a curved boundary. The methods aim at high-order accuracy and the difficulty arises since the regular grid
cannot follow the curved boundary. Starting with the Lagrange multiplier formulation for the boundary conditions, we derive variational forms for the discretization of 2-D
elliptic problems with embedded Dirichlet boundary conditions. Within the framework of structured, regular rectangular grids, we treat curved boundaries according to the
principles that underlie the discontinuous Galerkin method. Thus, the high-order DGdiscretization is adapted in cells with embedded boundaries. We give examples of
approximation with tensor products of cubic polynomials. As an illustration, we solve a convection-dominated boundary-value problem on a complex domain. Although,
of course, it is impossible to accurately represent a boundary layer with a complex structure by means of cubic polynomials, the boundary condition treatment appears
quite effective in handling such complex situations.
A Fitted Mesh Method for a Class of Singularly Perturbed Parabolic Problems with a Boundary Turning Point
Authors: Dunne Raymond K. , O'Riordan Eugene , Shishkin Gregorii I. 
Published: April 2013

AbstractA class of singularly perturbed time-dependent convection-diffusion problems with a boundary turning point is examined on a rectangular domain. The
solution of problems from this class possesses a parabolic boundary layer in the neighborhood of one of the sides of the domain. Classical numerical methods on uniform
meshes are known to be inadequate for problems with boundary layers. A numerical method consisting of a standard upwind finite difference operator on a fitted mesh is
constructed. It is proved that the numerical approximations generated by this method converge uniformly with respect to the singular perturbation parameter. Numerical
results are presented that verify computationally the theoretical result.
An Improved Error Estimate for a Numerical Method for a System of Coupled Singularly Perturbed Reaction-diffusion Equations
Authors: Linss Torsten , Madden Niall 
Published: April 2013

AbstractWe consider a central difference scheme for the numerical solution of a system of coupled reaction-diffusion equations. We show that the scheme is almost
second-order convergent, uniformly in the perturbation parameter. We present the results of numerical experiments to confirm our theoretical
results.
Singularly Perturbed Problems Modeling Reaction-convection-diffusion Processes
Authors: O' Riordan Eugene , Pickett Maria L. , Shishkin Georgii I. 
Published: April 2013

AbstractIn this paper, parameter - uniform numerical methods for singularly perturbed ordinary differential equations containing two small parameters are studied.Parameter-explicit theoretical bounds on the derivatives of the solutions are derived. A numerical algorithm based on an upwind finite difference operator and an appropriate piecewise uniform mesh is constructed. Parameter-uniform error bounds for the
numerical approximations are established. Numerical results are given to illustrate the parameter-uniform convergence of numerical approximations.
Parametrized Newton’s Iteration for Computing an Eigenpair of a Real Symmetric Matrix in an Interval
Authors: Datta Karabi , Hong Yoopyo , Lee Ran Baik 
Published: April 2013

AbstractA parameterized Newton’s method to guarantee convergence to an eigenpair of a real symmetric matrix in a designated interval has been developed. The method is parametric in nature and with appropriate choices of parameters, the classical methods such as Newton’s method and the Rayleigh quotient method can easily be recovered.
Difference Schemes for Elliptic Equations with Mixed Derivatives
Authors: Matus Piotr , Rybak Irina 
Published: April 2013

AbstractIn this paper, the a priori estimates of stability in the energy and
the uniform norms are proved for the monotone and conservative difference schemes
approximating elliptic equations with mixed derivatives. The estimates are obtained
without any assumption about the symmetry of the coe±cient matrix of the initial
differential equation.