bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stability of equilibrium configurations for elastic films in two and three dimensions
Authors: Bonacini Marco 
Published: January 2014

Abstract
We establish a local minimality sufficiency criterion, based on the strict positivity of the second variation, in the context of a variational model for the epitaxial growth of elastic films. Our result holds also in the three-dimensional case and for a general class of nonlinear elastic energies. Applications to the study of the local minimality of flat morphologies are also shown.
On the solutions of a singular elliptic equation concentrating on a circle
Authors: Manna Bhakti B. , Srikanth P. Chakravarthy 
Published: January 2014

Abstract.
Let

A
=
{
x
∈

ℝ

2
N
+
2

:
0
<
a
<
|
x
|
<
b
}

${A=\lbrace x\in \mathbb {R}^{2N+2} : 0&lt; a&lt; |x| &lt;b\rbrace }$

be an annulus. Consider the following singularly perturbed elliptic problem on A:

-

ε
2

▵
u

+

|
x
|

α

u
=

|
x
|

α

u
p

${-\varepsilon ^2{\triangle u} + |x|^{\alpha }u = |x|^{\alpha }u^p}$

in A,
u > 0 in A,

∂
u

∂
ν

=
0

$\frac{\partial u}{\partial \nu } = 0$

on

∂
A

$\partial A$

,
where

1
<
p
<

2
*

-
1

${1&lt;p&lt;2^*-1}$

.
We shall show that there exists a positive solution

u
ε

${u_\varepsilon }$

concentrating on an S1
orbit as

ε
→
0

${\varepsilon \rightarrow 0}$

. We prove this by reducing the problem
to a lower-dimensional one and analyzing a single point concentrating solution in the lower-dimensional space. We make precise how the single peak concentration depends on the parameter α.
On hemicontinuity of bifunctions for solving equilibrium problems
Authors: Alleche Boualem 
Published: January 2014

Abstract.
This paper deals with solving equilibrium problems under
local conditions on equilibrium bifunctions. Some techniques first
considered for multivalued mixed variational inequalities are
investigated and applied to equilibrium problems. It results that
the notion of hemicontinuity is not needed on the whole space when
solving equilibrium problems involving pseudomonotone or
quasimonotone bifunctions. Generalizations of some well-known
results concerning existence of solutions of equilibrium problems
are obtained and applications to equilibrium problems involving
two, rather than one, bifunctions are given.
Refined semiclassical asymptotics for
fractional powers of the Laplace operator
Authors: Frank Rupert L. , Geisinger Leander 
Published: January 2014

Abstract

We consider the fractional Laplacian on a domain and investigate the asymptotic behavior of its eigenvalues. Extending methods from semi-classical analysis we are able to prove a two-term formula for the sum of eigenvalues with the leading (Weyl) term given by the volume and the subleading term by the surface area. Our result is valid under very weak assumptions on the regularity of the boundary.
Large deviations for integrals of telegraph processes type
Authors: Logachov Artem V. , Makhno Sergey Y. 
Published: January 2014

Abstract.
We consider the sequence of processes

η
n

(
t
)

=

λ
n

ϕ
(
n
)

∫
0
t

cos

(
α
ν

(
n
s
)

+
β
)

d
s
,

$ \eta _n(t)= \frac{\sqrt{\lambda n}}{\varphi (n)}\int _0^t\cos (\alpha \nu (ns)+\beta )ds, $

where

ν
(
t
)

${\nu (t) }$

is a Poisson process with parameter

λ
t

${\lambda t}$

,

ϕ
(
n
)

${\varphi (n)}$

is a monotonically increasing function,

n
∈
ℕ

${n\in \mathbb {N}}$

. The aim of this paper is to prove a large deviations
principle for the processes

η
n

${\eta _n}$

.
Austria Inc. Forever? On the Stability of a Coordinated Corporate Network in Times of Privatization and Internationalization
Authors: Korom Philipp 
Published: January 2014

AbstractOne of the features of organized Austrian capitalism is a tightly-knit corporate network (Austria Inc.) that facilitates control and coordination between companies. In the 1980s the subsidiaries of the Austrian industry-holding stock company (ÖIAG) and the largest banks were the central hubs of this network. Now, 30 years later, ÖIAG has privatized nearly all its companies and banks have not only merged and sold their equity interests, but also partly joined international business groups. Nevertheless, Austria Inc. has not eroded. By analyzing a network of personal connections between 1976 and 2000, I investigate in this article how the network has reconfigured to allow Austria Inc. to perpetuate. The analysis suggests three explanations: Despite extensive privatization of the economy, Austrian ownership continues to prevail within the network; the banking group Raiffeisen filled the gap that was opened by the withdrawal of the state from the economic sphere; members of the Austrian elite still use board meetings for social networking.
Food intake regulating hormones in adult craniopharyngioma patients
Authors: Roemmler-Zehrer J , Geigenberger V , Störmann S , Losa M , Crippa V , Otto B , Bidlingmaier M , Dimopoulou C , Stalla G K , Schopohl J 
Published: January 2014

IntroductionPatients with craniopharyngioma (CP) have disturbances of the hypothalamic–pituitary axis and serious comorbidities such as obesity. We hypothesized that the secretion of hormones regulating the nutritional status is altered in adult patients with CP compared with patients with non-functioning pituitary adenoma (NFPA).MethodsWe included 40 CP (50% males, mean age: 49.6±14.3 years) and 40 NFPA (72.5% males, mean age: 63.4±9.8 years) patients. We measured glucose, insulin, leptin, total ghrelin, peptide-YY (PYY) and cholecystokinin (CCK) during oral glucose tolerance test (OGTT). Fat mass (FM) was determined by dual X-ray absorptiometry.ResultsGender distribution was not significantly different, but CP patients were significantly younger (P<0.001). CP patients had significantly higher BMI and FM than NFPA patients (BMI 32±8 vs 28±4 kg/m2,P=0.009 and FM 37±9 vs 33±9%,P=0.02). Fasting glucose level (84±12 vs 78±11 mg/dl,P=0.03), leptin (27.9±34.2 vs 11.9±11.6 μg/l,P=0.008) and leptin levels corrected for percentage FM (0.66±0.67 vs 0.32±0.25 μg/l%,P=0.005) were significantly higher in CP than in NFPA patients, whereas ghrelin was significantly lower (131±129 vs 191±119 ng/l,P=0.035). Insulin, PYY and CCK did not differ significantly between groups. After glucose load, leptin decreased significantly in CP patients (P=0.019). In both groups, ghrelin decreased significantly during OGTT (bothP<0.001). The percentage decline was significantly smaller for CP. PYY and CCK increased equally after glucose in both groups.ConclusionOur patients with CP have more metabolic complications than our patients with NFPA. The levels of leptin and ghrelin at fasting status and after glucose seem to be altered in CP, whereas changes in insulin, PYY and CCK do not seem to be responsible for the metabolic changes in these patients.
Optical Fabrication of Semiconductor Single-Crystalline Microspheres in Superfluid Helium
Authors: Okamoto Shinya , Ichikawa Satoshi , Minowa Yosuke , Ashida Masaaki 
Published: January 2014

ABSTRACTWe successfully fabricated semiconductor microspheres of ZnO, ZnSe, etc., by laser ablation in superfluid helium and investigated their morphology and optical properties. Time-resolved photoluminescence spectroscopy in ultraviolet region of single ZnO microspheres shows luminescence spectra with mode structures and remarkable reduction of the luminescence decay time compared to that of polycrystals or non-spherical microparticles. This indicates strong light-matter interaction due to efficient light-confinement in the ZnO microspheres. In addition, the fabricated ZnSe microspheres also show the photoluminescence spectra with typical mode structures indicating their high sphericity.
Production and biofunctionalization of elongated semiconducting nanocrystals for ex-vivo applications
Authors: Jochum Tobias , Ness Daniel , Dieckmann Marieke , Werner Katja , Niehaus Jan , Weller Horst 
Published: January 2014

ABSTRACTHereby, we present a synthetic route for the production of wurtzite (WZ) CdSe nanocrystals (NCs), which are essential for further shell growing reaction (e.g. CdSe/CdS dot-in-rod (DRs) nanoheterostructures). Our continuous flow reactor set-up consists of a separate nucleation chamber and growth oven. Both components can be heated up to temperatures above 350 °C to guarantee WZ crystal structure.Furthermore, we introduce DRs as the next powerful tool concerning biological imaging and assay detection. Using DRs in cell imaging results in an increased sensitivity due to the higher brightness compared to spherical core/shell/shell (CSS) nanocrystals.
OMVPE of InAlAs Using Alternative Al and As Precursors
Authors: Smith Brittany L. , Hoven Nichole M. , Hillier Glen , Hubbard Seth M. , Forbes David V. 
Published: January 2014

ABSTRACTAlternate aluminum and arsenic precursors were investigated for InAlAs grown by organometallic vapor phase epitaxy (OMVPE). The quality of the InAlAs growths was investigated by secondary-ion mass spectrometry (SIMS) to measure impurity concentrations. Trends are extracted from SIMS measurements for each precursor as a function of V/III ratio and growth temperature. Two arsenic precursors, arsine and tertiarybutylarsine (TBAs), were chosen to compare InAlAs growth quality. The impurity concentrations measured by SIMS decrease as the V/III ratio increases, for both arsine and TBAs growths. Impurities also decrease as growth temperature increases. Two aluminum precursors, trimethylaluminum (TMAl) and tritertiarybutylaluminum (TTBAl), were used to compare the effect of alumimum precursor on carbon and oxygen impurity levels. TMAl is widely studied in literature, though TTBAl is less common. This study represents the first report using the TTBAl precursor for InAlAs growth. Each aluminum source is used in conjunction with each aforementioned arsenic precursor in order to compare all possible precursor combinations. TMAl growths demonstrated decreasing impurities with increasing V/III ratio. TTBAl growths did not exhibit such a dependence, impurity concentrations remained virtually constant regardless of V/III ratio.
Application of the CALPHAD method to the thermodynamic modeling of a miscibility gap in the U-Nd-O phase diagram
Authors: Dottavio Giannina , Pontillon Yves , Desgranges Lionel , Gueneau Christine , Dumas J-C. 
Published: January 2014

ABSTRACTDuring neutron irradiation in nuclear power plants, uranium dioxide (UO2), the most used nuclear fuel, changes gradually its chemical composition because of the incorporation of new chemical elements which are created by fissions and named Fission Products (FP). As a consequence, the fluorine-type crystalline structure and its lattice parameters may also be modified. In order to better understand this behavior, neodymium-doped UO2 ceramics have been prepared with the aim to simulate the crystallographic matrix of irradiated fuels, since Nd is one of the most abundant FP. In a previous work, high temperature X-ray diffraction was performed on a sample (U0.72Nd0.28)O2, annealed under reducing conditions. The diffractograms evidenced, for the first time, the existence of a miscibility gap in the U-Nd-O system.In this paper, we present the first results of a thermodynamic modeling of the ternary system U-Nd-O based on the CAlculation of PHAse Diagrams (CALPHAD) method, in order to obtain a complete description of this miscibility gap. The very first results of this modeling seem to confirm the presence of a region presenting two FCC (fluorite) phases (instead of a single solid solution, which is expected from literature). At room temperature, the gap appears from a Nd content as small as about 0.02 at. % and an O/M ratio slightly lower than 2.
Advanced Treatment Process for Pharmaceuticals, Endocrine Disruptors, and Flame Retardants Removal
Authors: Sundaram Vijay , Emerick Robert W. , Shumaker Stanley E. 
Published: January 2014

ABSTRACT: The objective of this project was to demonstrate the effectiveness of an advanced treatment process that did not utilize reverse osmosis for the removal of pharmaceuticals, endocrine disruptors and flame retardants (collectively referred as contaminants of emerging concern [CECs]) from municipal effluent. The advanced treatment process consisted of (in the order of use): membrane filtration, ozonation (O3), and biologically active carbon (BAC) filtration. Ozone dosage of 5 mg/L or more was needed for desired CEC removal. Biologically active carbon removed flame retardants, and ozonation byproducts including NDMA and aldehydes. The project successfully demonstrated 1) the removal of a wide range of CECs, 2) reduction of estrogen activity to background levels, and 3) removal of ozonation byproducts. Treatment was achieved at lower costs and power utilization than reverse osmosis and without generating a concentrate stream. Results from this project could make CEC removal feasible, especially in situations where reverse osmosis treatment is infeasible.
Caffeinated and Decaffeinated Coffee Consumption and Risk of Type 2 Diabetes: A Systematic Review and a Dose-Response Meta-analysis
Authors: Ding Ming , Bhupathiraju Shilpa N. , Chen Mu , van Dam Rob M. , Hu Frank B. 
Published: January 2014

OBJECTIVE
Previous meta-analyses identified an inverse association of coffee consumption with the risk of type 2 diabetes. However, an updated meta-analysis is needed because new studies comparing the trends of association for caffeinated and decaffeinated coffee have since been published.

RESEARCH DESIGN AND METHODS
PubMed and Embase were searched for cohort or nested case-control studies that assessed the relationship of coffee consumption and risk of type 2 diabetes from 1966 to February 2013. A restricted cubic spline random-effects model was used.

RESULTS
Twenty-eight prospective studies were included in the analysis, with 1,109,272 study participants and 45,335 cases of type 2 diabetes. The follow-up duration ranged from 10 months to 20 years. Compared with no or rare coffee consumption, the relative risk (RR; 95% CI) for diabetes was 0.92 (0.90–0.94), 0.85 (0.82–0.88), 0.79 (0.75–0.83), 0.75 (0.71–0.80), 0.71 (0.65–0.76), and 0.67 (0.61–0.74) for 1–6 cups/day, respectively. The RR of diabetes for a 1 cup/day increase was 0.91 (0.89–0.94) for caffeinated coffee consumption and 0.94 (0.91–0.98) for decaffeinated coffee consumption (P for difference = 0.17).

CONCLUSIONS
Coffee consumption was inversely associated with the risk of type 2 diabetes in a dose-response manner. Both caffeinated and decaffeinated coffee was associated with reduced diabetes risk.
IDENTITIES OF SYMMETRY FOR GENERALIZED TWISTED BERNOULLI POLYNOMIALS TWISTED BY RAMIFIED ROOTS OF UNITY
Authors: Kim Dae San 
Published: January 2014

Abstract
We derive eight identities of symmetry in three variables related to generalized twisted Bernoulli polynomials and generalized twisted power sums, both of which are twisted by ramified roots of unity. All of these are new, since there have been results only about identities of symmetry in two variables. The derivations of identities are based on the p-adic integral expression of the generating function for the generalized twisted Bernoulli polynomials and the quotient of p-adic integrals that can be expressed as the exponential generating function for the generalized twisted power sums.
EXISTENCE OF EQUILIBRIUM FOR GAMES WITH UPPER SEMICONTINUOUS CORRESPONDENCES, UNDER UNCERTAINTY
Authors: Patriche Monica 
Published: January 2014

Abstract
In this paper we prove the existence of equilibrium pairs for the new model of a Bayesian free abstract economy which extends Kim and Lee's deterministic model of a free abstract economy (2006). Our existence theorems are proved for the case of upper semicontinuous correspondences. We also define a model of a general Bayesian abstract economy and introduce the new notion of equilibrium pair. We prove the existence of equilibrium pair and equilibrium for this type of abstract economy.
ALMOST α-COSYMPLECTIC ƒ-MANIFOLDS
Authors: Öztürk Hakan , Murathan Cengizhan , Aktan Nesip , Vanli Aysel Turgut 
Published: January 2014

Abstract
The purpose of this paper is to study a new class of framed manifolds. Such manifolds are called almost α-cosymplectic ƒ-manifolds. For some special cases of α and s, one obtains (almost) α-cosymp(lectic, (almost) C-manifolds, and (almost) Kenmotsu ƒ-manifolds. Moreover, several tensor conditions are studied. We conclude our results with a general example on α-cosymplectic ƒ-manifolds.
Assessing of Daylight Factor Values Depending on Window Opening Structures in Model Room
Authors: Balková Milada 
Published: January 2014

Abstract
In this article, there are compared the types of opening structures in terms of their size and in terms of covering of opening structures with curtains or blinds. Two windows were used in the first case and three windows in the second case. In the third case, the window was divided into three parts, and in the fourth case, the window was divided into three parts covered with curtains. The size of opening structures in the first half of the room, near the windows, has the greatest impact on lighting. In the rear part of the room, the difference is not so great. If the windows are covered with curtains or blinds, the difference in room lighting is significant.
Assessing the Weld Quality of Manganese Steel
Authors: Bernát Rastislav , Záležák Zoltán , Kecskés Norbert , Blaško Peter 
Published: January 2014

Abstract
The welding of alloy steels in practice is a difficult process in order to achieve mechanically or chemically resistant high-quality welds. In some cases, the weldability of many materials can be difficult or is not recommended because of poor and unsuitable properties of welded joints. In our research work, we investigate the selection of an appropriate welding method for welding the manganese steel HS 20 used at dynamically strained components in the car industry. The welding methods have been selected from accessible methods of the KARRER, s.r.o. Tovarníky industrial plant. Based on the comparable welding technologies MMA, MIG/ MAG and TIG, we tested and verified the quality of welds by means of selected weld tests. The quality of these welds, obtained by the abovementioned methods, was evaluated by weld tests in laboratory conditions of the Department of Quality and Engineering Technologies (Slovak University of Agriculture in Nitra) in cooperation with NDB, s.r.o. Bratislava and SES Tlmače, a.s. The aim of the research work is to set the most suitable and effective method of welding for given components from all the technologies available in the mentioned industrial plant. Based on relevant information, we also want to enrich the scope of knowledge about welding of manganese materials in order to make the welding process more effective.
Results of Experimental Research of Granular Materials Transportation by Tubular Scraper Conveyors
Authors: Lyashuk Oleg , Dyachun Andriy , Zolotuy Roman , Oleksyshyn Olexandr , Zamora Yroslav , Tkáč Zdenko 
Published: January 2014

Abstract
A full factor experiment (FFE33) of transporting bulk materials by a tubular scraper conveyor on a curved track was conducted. There were derived the regression equation dependencies of production and torque on pipe diameter, fill factor and linear velocity. The graphical dependence of production and torque on the above-mentioned factors was constructed, and regression coefficients for different materials were determined.
A predictive estimation based control strategy for a quasi-resonant dc-link inverter
Authors: Turzyński M. , Banach P. , Murawski P. , Pepliński R. , Chrzan P.J. 
Published: January 2014

Abstract
Control of parallel quasi resonant dc link inverters (PQRDCLI) is usually based on dc link input inverter current. Instead of a direct measurement of this noise sensitive and fast changing current signal - its estimation with one step prediction may be considered. Estimation of an input inverter current is based on inverter output current measurements, applied in most of power electronics controlled ac drives. In this paper, the PQRDCLI fed induction motor (IM) with a predictive current estimation stabilizes resonant inverter output voltage slopes du/dt independently of load. By control of output voltage derivatives, reduction of overvoltage spikes and common mode motor currents is achieved. An analysis of the PQRDCLI control with a predictive current estimation strategy is verified by the Saber system simulation and experimental tests in a laboratory setup.
Push-pull resonant DC-DC isolated converter
Authors: Jalbrzykowski S. , Citko T. 
Published: January 2014

Abstract
A new concept of a DC-DC converter with galvanic isolation is proposed in this paper. The converter belongs to the class E resonant converters controlled by pulse width modulation via frequency regulation (PWM FM). Due to the possibility of operation in the boost and buck modes, the converter is characterized by a high range of voltage gain regulation. The principle of converter operation described by mathematical equations is presented. The theoretical investigations are confirmed by p-spice model simulations and the measurement of an experimental model of 1kW laboratory prototype.
Modern Direct Torque and Flux Control methods of an induction machine supplied by three-level inverter
Authors: Sikorski A. , Kulikowski K. , Korzeniewski M. 
Published: January 2014

Abstract.
This paper describes two modern direct torque and flux control methods of an induction machine supplied by a three-level inverter. Additionally, it presents a comparison of the methods both in static and dynamic states. The methods, in a specific way, make use of an increased number of active vectors of the three-level inverter in order to improve control quality and reduce switching frequency. The two methods modify the DTC method by using its advantages and eliminating, at the same time its drawbacks.
In static states the comparison was based on the results of investigations performed for two different load values and three set values of angular speed, whereas in dynamic states the comparison was focused on the behavior of the machine at startup.
The results of the investigations have shown that both methods give very good performance. They are characterized by both sinusoidal shape of flux and low current deformations even at low angular speeds i.e. less than 10% of the nominal value. The presented methods also allow to generate nominal flux for set zero angular speed in order to achieve excitation of the induction machine. The switching frequencies for both methods are very similar in almost the whole range of control but the methods have shown some differences in control quality, particularly for higher torque values.
Necessary and sufficient conditions for stability of fractional discrete-time linear state-space systems
Authors: Busłowicz M. , Ruszewski A. 
Published: January 2014

Abstract
In the paper the problems of practical stability and asymptotic stability of fractional discrete-time linear systems are addressed. Necessary and sufficient conditions for practical stability and for asymptotic stability are established. The conditions are given in terms of eigenvalues of the state matrix of the system. In particular, it is shown that (similarly as in the case of fractional continuous-time linear systems) in the complex plane exists such a region, that location of all eigenvalues of the state matrix in this region is necessary and sufficient for asymptotic stability. The parametric description of boundary of this region is given. Moreover, it is shown that Schur stability of the state matrix (all eigenvalues have absolute values less than 1) is not necessary nor sufficient for asymptotic stability of the fractional discrete-time system. The considerations are illustrated by numerical examples.