bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of GT-transition Strengths in \(A=34\) Isobars Using Charge Exchange \((^3\text{He},t)\) Reaction
Authors: Khai Nguyen Tuan , Linh Bui Duy , Thiep Tran Duc , Fujita Y. , Adachi T , Fujita H. , Tamii A.
Published: September 2014

Under the assumption that isospin \(T\) is a good quantum number, mirror transitions \(T_{z }= +1 \to  0\) and \(T_{z }= -1  \to  0\) were studied in \(A = 34\) isobars, where \(T_{z}\) is \(z\) component of iospin \(T\) and is defined by \(T_{z} = (N-Z)/2\). With a high energy resolution of 35 keV in \(^{34}\)S\((^{3}He,t)^{34}\)Cl reaction measurement at \(0^{\circ}\) scattering angle and at an incident energy of 140 MeV/nucleon, strengths of Fermi and Gamow-Teller (GT) transitions from the \(J^{\pi } = 0^{ + }\), \(T_{z }= +1\) ground state of \(^{34}\)S to the \(J^{\pi } = 1^{+ }\), \(T_{z }= 0\) excited states in \(^{34}\)Cl were determined up to excitation energy \((E_{x})\) of \(7.08\) MeV. The corresponding isospin-symmetric transitions connecting \(T_{z }= -1\) and \(T_{z }= 0\) states can be studied in the \(^{34}\)Ar \(\beta ^{ + }\) decay. The strengths of the \((GT)_{\pm }\) transitions were compared up to the excitation energy of 3.1 MeV. A good agreement was observed for two strong transitions to \(2.580\) MeV and \(3.129\) MeV states, while a disagreement about \(45\text{%}\) was observed for a weaker transition to \(0.666\) MeV low-lying state.
Néel State in the Fermionized Spin 1/2 Heisenberg Antiferromagnet on Hypercubic and Triangular Lattices
Authors: Thang Nguyen Toan , Nga Pham Thi Thanh
Published: September 2014

We study the Néel state of the spin 1/2 Heisenberg antiferromagnet model on hypercubic and triangular lattices, employing an auxiliary fermion representation for spin operators with Popov-Fedotov trick. The unphysical states are eliminated on each site by introducing an imaginary chemical potential. Working in local coordinate systems we obtain the free energy and the sublattice magnetization for both lattices in an unified manner. We show that exact treatment of the single occupancy constraint gives a significant effect at finite temperatures.
Pulsed Electron Deposition (PED) - a Novel Tool for Growth of Thin Films
Authors: Sang Ngo Dinh , Quang Pham Hong , Ngoc Do Quang
Published: September 2014

Pulsed Electron Deposition (PED) is a novel technique that can be applied for growing high quality thin films. In this technique, we used an electron beam with a focused diameter of about 1 mm, the energy up to 15 kV, the frequency of 1-10 Hz, the pulse width of 100 ns and the total current of 1.5 kA generated in a discharge system. A remarkable advantage of this technique is the low deviation in composition from bulk to film. By using the PED technique the transparent coducting ZnO and Cu(InGa)Se\(_{2 }\) films were prepared. The effect of some deposition conditions on the properties of film has been examined and discussed. For Cu(InGa)Se\(_{2 }\), the best film was obtained at the discharge voltage of 12 kV and substrate temperature of 400\(^\circ\)C, while for ZnO, the best film was grown at the oxygen pressure of 1.3 Pa and at 400(^\circ\)C.
The Magnetic Casimir Effect between Two Parallel Ferromagnetic Plates
Authors: Lien Do Phuong , Tuan Nguyen Anh , Anh Nguyen Tuan
Published: September 2014

In this work, we study theoretically the long-range magnetic interaction between two parallel ferromagnetic plates, which arises from the magnetic Casimir effect. The behavior of the interaction is discussed for two configurations when the magnetization is perpendicular or parallel to the plates. The dependence of the Casimir force and Casimir energy on different interplate distances D has been investigated. Results of numerical calculations for a cobalt system have been also presented.
Magnetohydrodynamics in Presence of Electric and Magnetic charges
Authors: Bisht Praveen Singh , Pushpa . . , Negi O. P. S.
Published: September 2014

Starting from the generalized electromagnetic field equations of dyons, the magnetohydrodynamics (MHD) of plasma for particles carrying simultaneously the electric and magnetic charges (namely dyons), has been reformulated in terms of the electromagnetic duality. Consequently, the frequency of dyonic plasma is obtained for real value of wave number \(k\). In this case, only those generalized electromagnetic waves are allowed to pass, for which the usual frequency is greater than the plasma frequency (i.e. \(\omega>\omega_{p})\). Accordingly, the Ohm's law has been re-described to derive the plasma oscillation equation, Magnetohydrodynamic wave equation and to calculate the energy of dyons in unique and consistent manner.
A Feasibility Study in Application of a Gamma Scattering Technique for Inspecting Density Variation by Monte Carlo Method
Authors: Khiem Le Hong , Trong Tran Dinh , Thao Nguyen Van
Published: September 2014

Back-scattering gamma-rays have been extensively used for years as a nondestructive tool for inspecting the materials in different fields of the economy. The intensities of Compton scattering gamma-rays from the scattering medium strongly depend on its electron density and therefore in its mass density. This feature is very useful for using it as a viable tool for inspecting material. This work aims to investigate the feasibility of application of gamma scattering technique for inspecting density variation in some construction objects by Monte-Carlo simulation method. The gamma-ray sources of different energies and strengths have been used to  extract  the information of density variation  for  interior of  sample by  recording  the backscattering gamma-rays with a gamma-ray detector. The results of our simulations confirm that the resolution for density variation in the inspected objects is quite good. The results should also prove useful in the optimum design of the nondestructive density gauges.
Dielectric and Relaxor Ferroelectric Properties in \(\text{PZT-PMnN-PSbN}\) Ceramics
Authors: Huy Than Trong , Luan Nguyen Dinh Tung , Chuong Truong Van , Hong Le Van
Published: September 2014

The rhombohedral perovskite 0.9Pb(Zr0.5Ti0.5)O3 – xPb(Mn1/3Nb1/3)O3 – (0.1-x)Pb(Sb1/2Nb1/2)O3, x = 0.05; 0.06; 0.07; 0.08; 0.09; 0.1 (PZT – PMnN – PSbN) ceramic was synthesized by the Columbite precursor rout. The temperature dependence of dielectric constant and its loss in a frequency region of 0.1 kHz – 500 kHz were measured in aim to search the weak-field dielectric response in PZT-PMnN-PSbN systems. A high value of εmax > 20000 was found at 1 kHz with the temperature Tm of around 575K. Using an extended Curie-Weis law the diffuse phase transition was determined. Fitting by using Vogel – Fulcher and power relationship indicated that the polarization fluctuation above the static freezing temperature behaves like as a spin-glass one. Cole – Cole analyses showed the non – Debye type relaxation in the system.
Neutrality Effects on the Phase Structure of the Linear Sigma Model with the Non-standard Symmetry Breaking
Authors: Phat Tran Huu , Long Nguyen Van , Thu Nguyen Van
Published: September 2014

The neutrality effects on the phase structure of the linear sigma model with the non-standard symmetry breaking term is systematically studied by means of the Cornwall-Jackiw-Tomboulis effective potential. The latter quantity is calculated in the improved Hartree-Fock approximation which preserves the Goldstone theorem and the thermodynamic consistency. Its results that in the region \(\mu > m_\pi\), as a function of the temperature \(T\), the pion condensate undergoes a second order phase transition, as a function of the isospin chemical \(\mu\), it undergoes a first order phase transition. In the region \(\mu < m_\pi\), the pion condensation is always a first order phase transition.
Synthesis and Photoluminescent Property of \(\text{MgO:Cr}^{3+}\) Powders
Authors: Loan Trinh Thi , Long Nguyen Ngoc , Cuong Le Hung
Published: September 2014

MgO:Cr3+ powders with different dopant contents have been synthesized by sol-gel method using the following precursors: magnesium nitrate (Mg(NO3)2), chrome nitrate (Cr(NO\(_3\))\(_3\)), and citric acid. The effect of the Cr\(^{3+}\) concentration and heat-treating temperature on structural and optical properties of the synthesized samples has been studied. For the samples with the low Cr3+-dopant concentrations or low heat-treating temperature, the photoluminescent (PL) spectra consist of sharp lines assigned to the \(^2\)E \(\to\) \(^4\)A\(_2\) transition of ions Cr3+ in perfect octahedral symmetry sites. But for the samples with the high Cr\(^{3+}\)-dopant concentrations and undergone high heat-treating temperature, the PL spectra appear a broad emission bands, which is assigned to the \(^4\)T\(_1\to ^4\)A\(_2\) transitions within the Cr\(^{3+}\) ions in the MgO orthorhombic symmetry crystal field.
Density Functional Based Tight Binding Study on Wurzite ZnS Nanowires
Authors: Lien Le Thi Hong , Tuoc Vu Ngoc , Thuong Nguyen Thi
Published: September 2014

We present a semi-abinitio - Density Functional Based Tight Binding (DFTB) study on the atomic and electronic structure of ZnS Nanowire (NW) and examine the dependence of surface stress on nanowire lateral size and shape. The ZnS wurtzite wire size ranges from 10 to 45Å and of various possible shapes - triangular, hexagonal and circular-like. We investigate the role of unsaturated dangling bond state in the region of band gap varying the wire's diameter. We have calculated the surface formation energy and find that it decreases with increasing the wire diameter and a greater stability (lower surface formation energy) comes with hexagonal and circular-like depending on wire's diameter. Other electronics and mechanical properties e.g. density of states (DOS), Young modulus...  also are found to depend on the wire's size and shape. Futher the wire passivation by hydrogen has also investigated.
Effects of Thermodynamic Pairing on Nuclear Level Density
Authors: Hung Nguyen Quang , Dung Dang Thi , Trong Tran Dinh
Published: September 2014

Thermodynamic properties of some selected even-even nuclei such as $^{56}$Fe, $^{60}$Ni, $^{98}$Mo, and $^{116}$Sn are studied within the Bardeen-Cooper-Schrieffer theory at finite temperature (FTBCS) taking into account pairing correlations. The theory also incorporates the particle-number projection within the Lipkin-Nogami method (FTLN). The level densities are derived based on the statistical theory of the grand-canonical ensemble (GCE). The results obtained are compared with the recent experimental data by Oslo (Norway) group. It is found that pairing correlations have significant effects on nuclear level density, especially at low and intermediate excitation energies.
Influence of Solvents on Spin Transition of \([\text{Fe(ABPT)}_2{(\text{C(CN)}_3)}_2]\) Spin-crossover Molecule
Authors: Tuan Nguyen Anh
Published: September 2014

We present a density-functional study of the inuence of solvents on the geometricstructure and the electronic structure of the low-spin and high-spin states of [Fe(ABPT)2 (C(CN)3)2] molecule with abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole, in order to explore more aboutthe way to control spin-crossover behavior of transition metal molecules. Our calculated resultsdemonstrated that the geometric structure of molecule under consideration is only slightly changedby solvents. However, typical quantities of the electronic structure and spin-transition of thismolecule such as the atomic charge, the magnetic moment of Fe ion, the HOMO-LUMO gap, andthe spin-state energy dierence are varied as a function of dielectric constant of solvents. Theyreach saturation values with increasing dielectric constant. These results should give some hintsto control spin transition temperature of spin-crossover molecules.
Preparation and Photocatalytic Activity of \(\text{ZnO/TiO}_2\) Hierarchical Heterogeneous Nanostructures via DC Magnetron Sputtering
Authors: Quy Le Phuc , Thu Vu Thi Hanh
Published: September 2014

TiO\(_2\) thin films are used for oxidation of organic radicals, reducing CO\(_2\), skin cancer treatment, decomposing halogen compounds in the air, breaking down surface contaminants, water treatment, biodegradable oil on the surface of the water, disinfect, anti-bacteria, self-cleaning and anti-fog coating,… To increase the photocatalytic and anti-Ecoli bacteria abilities of TiO\(_2\) thin films, this study synthesized the ZnO/TiO\(_2\) hierarchical heterogeneous nanostructures (HNs) by DC magnetron sputtering. The results showed that ZnO/TiO\(_2\) (HNs) has been the photocatalytic and anti - Ecoli bacteria abilities higher than TiO\(_2\) film. This result is explained by reducing the recombination of electrons - holes and slightly shifted absorption edge of them to the visible light band.
Influence of Reaction Temperature on Optical Property of Mn-Doped ZnS Nanoparticles
Authors: Van Bui Hong , Ben Pham Van , Nhat Hoang Nam
Published: September 2014

The reaction temperature has essential effect on quality of the product synthesized by hydrothermal method. We report here the variation of the optical characteristics of Mn-doped ZnS nanocrystallites prepared by mean of the stated method from Zn(CH$_{3}$COO)$_{2}$.2H$_{2}$O, Mn(CH$_{3}$COO)$_{2}$.4H$_{2}$O and Na$_{2}$S$_{2}$O$_{3}$.5H$_{2}$O as the precursors. The reaction temperature was set to vary from 120\r{}C to 240\r{}C at a constant reaction time of 15 hours. The XRD patterns showed that, for the reaction temperature range from 120 to 160\r{}C, the obtained products possessed a cubic $T_d^2 - F\overline 4 3m$ and a wurtzite $C_{6v}^4 - P6_3 mc$structure, in which the cubic phase was dominant. At the temperature range from 180 to 240\r{}C, the structures exhibited a cubic phase with the lattice constant increased from 5.41 to 5.43 {\AA}. The photoluminescence spectra showed that with the increase of reaction temperature from 120 to 240\r{}C the intensity of a blue band around 425 - 500 nm (attributed to both Zn, S vacancies) gradually decreased while the intensity of a yellow-orange band at 585 nm (attributed to the $^{4}$T$_{1}(^{4}$G) - $^{6}$A$_{1}(^{6}$S) transition of Mn$^{2 + }$ ions) was enhanced and reached maximum at 220\r{}C. The excitation spectra of the 585 nm band recorded at 160\r{}C showed a band at 335 nm which should be assigned to the near band-edge absorption. With increasing temperature to 200-240\r{}C the new bands appeared at 390, 430, 467, 494 nm. The intensity of these bands increased with temperature and achieved the maxima at 220\r{}C. They should be attributed to the absorption transitions of electrons from ground state $^{6}$A$_{1}(^{6}$S) to excited states$^{ 4}$E($^{4}$D); $^{4}$T$_{2}(^{4}$D); $^{4}$A$_{1}(^{4}$G) - $^{4}$E($^{4}$G); $^{4}$T$_{2}(^{4}$G) of Mn$^{2 + }$(3d$^{5})$ ions, respectively. The bands at 467, 494 nm only exposed clearly in the absorption spectra at 220\r{}C and 240\r{}C.
Ward-Takahashi Identity for Vertex Functions of \(\text{sQED}\)
Authors: Hung Ha Thanh , Hue Le Tho , Long Hoang Ngoc
Published: September 2014

Ward-Takahashi identity is an useful tool for calculatingamplitude of scattering processes. In the high-order perturbative  theory of sQED,  propagator and vertex functions  contain  many high-order corrections. By using  Ward-Takahashi identity, each vertex function is separated into  two parts: ``longitudinal'' and ``transverse'' part. The longitudinal part can be directly calculated   from Ward-Takahashi identity.  The transverse  part depends on the expanding of  specific orders of   the theory. In this report, we  present one method based on the Ward-Takahashi identity,   to calculate this  part of vertex functions at the one-loop order in arbitrary gauge and dimensions in sQED.
Mott Transition of the Half-filled Hubbard Model in a Two-dimensional Frustrated Lattice
Authors: Tuan Hoang Anh , Anh Le Duc
Published: September 2014

Using coherent potential approximation we study zero-temperature Mott transition of the half-filled Hubbard model in a two-dimensional square lattice with geometrical frustration. It turns out that the geometrical frustration reduces the gap between the Hubbard bands. As a result the metallic phase is stabilized up to a fairly large value of the on-site Coulomb interaction. We found that the critical value $U_C$ for the Mott transition is enhanced by the geometrical frustration. Our results are in good agreement with the ones obtained by the single-site dynamical mean-field theory.
Phenomenology of the Reduced Minimal 3-3-1 Model
Authors: Lam Tran Thanh , Thao Nguyen Chi , Tinh Ho Hoang , Xinh Nguyen Thi , Xuyen Nguyen Van , Long Hoang Ngoc
Published: September 2014

The detailed analysis of the gauge model based on \(\mathrm{SU}(3)_C\otimes \mathrm{SU}(3)_L \otimes \mathrm{U}(1)_X\) group with minimal content of lepton and Higgs is presented. It is shown that with just two Higgs triplets, all fermions and gauge bosons can get correct   masses. The advantage of the model under consideration is that a huge number of free parameters is reduced, and the model's predictiveness is much improved.
Mapping Atomic Hydrogen in the Disk of the Milky Way
Authors: Hiep Nguyen Van , Anh Pham Tuan , Darriulat Pierre , Diep Pham Ngoc , Dong Pham Ngoc , Hoai Do Thi , Nhung Pham Thi Tuyet , Thao Nguyen Thi
Published: September 2014

The VATLY radio telescope has been used to draw the map of atomic hydrogen gas in the disk of the Milky Way. Evidence has been obtained for its differential rotation, its cloud and arm structure and the presence of a dark matter halo.
Uncorrelated electron-hole transition Energy in GaN│InGaN│GaN Spherical QDQW Nanoparticles
Authors: El Ghazi Haddou , Jorio Anouar , Zorkani Izeddine
Published: September 2014

The electron (hole) energy and uncorrelated \(1S_e - 1S_{h}\) electron-hole transition in Core(GaN)| well(In\(_x\)Ga\(_{1 - x}\)N)| shell(GaN) spherical QDQW nanoparticles is investigated as a function of the inner and the outer radii. The calculations are performed within the framework of the effective-mass approximation and the finite parabolic potential confinement barrier in which two confined parameters are taking account. The Indium composition effect is also investigated. A critical value of the outer and the inner ratio is obtained which constitutes the turning point of two indium composition behaviors.
Fabrication and Magnetic Properties of \(\text{Nd}_2\text{Fe}_{14}\text{B/Fe}_{65}\text{Co}_{35}\) Hard Magnetic Ribbons
Authors: Truong Nguyen Xuan , Khanh Nguyen Van
Published: September 2014

Nd\(_2\)Fe\(_{14}\)B/Fe\(_{65}\)Co\(_{35}\) hard magnetic ribbons were fabricated by melt-spinning technique using Nd\(_{16}\)Fe\(_{76}\)B\(_{8 }\) and Fe\(_{65}\)Co\(_{35}\) pre-alloys as starting materials. The results showed that the formation of the interactive hard/soft nanocomposite with the homogeneous distribution of the Fe-Co phase throughout the Nd\(_{2}\)Fe\(_{14}\)B matrix provided the Curie temperature (\(T_{c})\) as high as 747 K, the magnetic remanence (B\(_{r}\)) of 8.88 kG and the maximum energy product, (BH)\(_{\max}\), of 16.75 MG.Oe for the fabricated Nd\(_{2}\)Fe\(_{14}\)B/Fe\(_{65}\)Co\(_{35}\) ribbons at the optimal speed of 25 m/s. In addition, the intrinsic coercivity (\(_{i}\)H\(_{c}\)) of 9.27 kOe and remanence coercivity (\(_{b}\)H\(_{c}\)) of 6.94 kOe were found for these ribbons. The roles of the soft Fe\(_{65}\)Co\(_{35}\) phase in the increasing of \(T_{c}\), \(B_{r}\) as well as in the (00l) preferred crystallographic orientation of hard magnetic grains on the free surface side of the fabricated ribbons were also discussed.
Nonmaximal Entanglement Can Make Joint Remote State Preparation Absolutely Secure
Authors: Bich Cao Thi , An Nguyen Ba
Published: September 2014

Joint remote state preparation is a multiparty global quantum task in which several parties are assigned to jointly prepare a quantum state for a remote party. Although various protocols have been proposed so far, none of them are absolutely secure in the sense that the legitimate parties (the preparers plus the receiver) can by no means identify the state to be prepared even if they all collude with each other. Here we resolve this drawback by employing the quantum channel in terms of nonmaximally entangled states whose parameters are kept secret to all the participants but used to split the information in a judicious way so that not only absolute security in the above-mentioned sense is achieved but also the performance is the simplest possible.
Magnetic Properties and Giant Magnetocaloric Effect In Mn-based Heusler Compounds
Authors: Dan Nguyen Huy , An Nguyen Manh
Published: September 2014

Magnetic properties and giant magnetocaloric effect (GMCE) of Mn-based Heusler compounds such as Co-Mn-Si, Ni-Mn-Sn, Ni-Mn-Sb have been investigated. The results show that the structure strongly influences on magnetic properties and GMCE of these alloys. The coexistence of ferromagnetic (FM) and antiferromagnetic (AFM) orders is observed. The magnetic phase transitions can be controlled by changing composition and annealing condition of the alloys. GMCEs with large magnitude and wide working temperature range have been obtained on these alloys showing their application potential for magnetic refrigeration technology.
ERRATUM
Authors: Thai Vu Kim , Anh Le Duc , Tuan Hoang Anh
Published: September 2014

ERRATUM
On Yukawa Couplings in the Zee-Babu Model
Authors: Long Hoang Ngoc , Vien Vo Van
Published: September 2014

The exact solution for neutrino mass matrix of the Zee-Babu modelis derived. The tribimaximal mixing imposes  the conditions on the Yukawa couplings, from  which the normal mass hierarchy ispreferred. The derived conditions give a possibility of maximal \(CP\) violation in the neutrino sector.
Folding of proteins in presculpted free energy landscape
Authors: Hung Nguyen Ba , Hoang Trinh Xuan
Published: September 2014

Recent studies of the tube model of protein have indicated that the free energy landscape of proteins is presculpted by symmetry of the protein backbone and geometrical constraints played by the hydrogen bonds. In this study, we investigate the role of amino acid sequences in the folding of proteins. We consider two models that are differed by sequence specificity: the tube HP model with hydrophobic (H) and polar (P) sequences, and the tube Go model with native-centric contact potentials. Monte Carlo simulations are carried out for two sequences of length of 48 amino acids, whose ground states are a three-helix bundle and a GB1-like structure.  The results show that folding inthe Go model is more cooperative than in the HP model. In the HP model the collapse transition and the folding transition are separated, whereas in the Go model the two transitions coincide.
Germanium Band Gap Engineering Induced by Tensile Strain for Si-Based Optoelectronic Applications
Authors: Phuong Luong Thi Kim , An Nguyen Manh
Published: September 2014

We have combined structural and optical characterizations to investigate the tensile-strained state and the band gap engineering of Ge layers grown on Si(001) using molecular beam epitaxy. The tensile strain is generated in the Ge layers due to a difference of thermal expansion coefficients between Ge and Si. The Ge growth on Si(001) was proceeded using a two-step growth process: a low-temperature step to produce relaxed buffer layers, followed by a high-temperature step to generate the tensile strain in the Ge layers. For the low-temperature step, we have evidenced the existence of a substrate temperature window from 260 to \(300\circ\)C in which the well-known Stranski-Krastanov Ge/Si growth mode transition from two-dimensional to three-dimensional growth can be completely suppressed. We show that the value of the tensile strain in the Ge layers lineally increases with increasing the growth temperature and reaches a saturation value of \(\sim 0.24\)% in the temperature range of \(700-770\circ\)C. Post-grown cyclic thermal annealing has allowed to increase the tensile strain up to 0.30%, which is the highest value ever reported to date. Finally, photoluminescence measurements reveal both an enhancement of the Ge direct band gap emission and a reduction of its energy due to the presence of tensile strain in the layers.
Topological Lifshitz Phase Transition in Effective Model of QCD with Chiral Symmetry Non-restoration
Authors: Huu Phat Tran , Thu Ha Phung Thi , Tuan Anh Nguyen
Published: September 2014

The topological Lifshitz phase transition is studied systematically within an effective model of QCD, in which the chiral symmetry, broken at zero temperature, is not restored at high temperature and/or baryon chemical potential. It is found that during phase transition the quark system undergoes a first-order transition from low density fully-gapped state to high density state with Fermi sphere which is protected by momentum-space topology. The Lifshitz phase diagram in the plane of temperature and baryon chemical potential is established. The critical behaviors of various equations of state are determined.
A New Solution to the Structure Equation in Noncommutative Spacetime
Authors: Viet Nguyen Ai
Published: September 2014

In this paper, starting from the common foundation of Connes' noncommutative geometry ( NCG)\cite{Connes1, Connes2, CoLo, Connes3}, various possible alternatives in the formulation of atheory of gravity in noncommutative spacetime are discussed indetails. The diversity in the final physical content of the theory is shown to be the consequence of the arbitrary choices in each construction steps. As an alternative in the last step, when the structure equations are to be solved, a minimal set of constraints on the torsion and connection is found to determine all the geometric notions in terms of the metric. In the Connes-Lott model of noncommutative spacetime, in order to keep the full spectrum of the discretized Kaluza-Klein theory \cite{VW2}, it is necessary to include the torsion in the generalized Einstein-Hilbert-Cartan action.
Leptogenesis in \(A_4\) Flavor Symmetry Model by Renormalization Group Evolution
Authors: Phong Nguyen Thanh
Published: September 2014

We study how leptogenesis can be implemented in the seesaw models with \(A_4\) flavor symmetry, which lead to the tri-bimaximalneutrino mixing matrix. By considering renormalzation groupevolution from a high energy scale of flavor symmetry breaking(the GUT scale is assumed) to the low energy scale of relevantphenomena, the off-diagonal terms in a combination of DiracYukawa-coupling matrix can be generated. As aresult, the flavored leptogenesis is successfully realized. Wealso investigate how the effective light neutrino mass \(|\langle m_{ee}\rangle |\) associated with neutrinoless double beta decaycan be predicted byimposing the experimental data on the low energy observables. Wefind a link between the leptogenesis and the neutrinoless doublebeta decay characterized by \(|\langle m_{ee}\rangle|\) through ahigh energy CP phase $\phi$, which is correlated with the lowenergy Majorana CP phases. It is shown that the predictions of \(|\langle m_{ee}\rangle|\) for some fixed parameters of the highenergy physics can be constrained by the current observation ofbaryon asymmetry.
Electrical Transport properties of Ni-Cr binary alloys
Authors: Suthar P. H. , Thakore B. Y. , Gajjar P. N.
Published: September 2014

Electrical transport properties viz. electrical resistivity and thermal conductivity of Ni-Cr binary alloys are determine by our recognized single parametric model potential in wide range of Cr concentration. In this work, screening functions (Ichimaru and Utsumi, Farid et al. and Sarkar et al.) are employed along with the Hartree and Taylor functions to study the relative influence of the exchange and correlation effect. Given liquid alloys are studied as a function of their composition at three different temperatures according to Faber-Ziman model. Computed values of electrical transport properties are in good agreement with the experimental data available in literature.
Ba\(_{1-x}\)Ca\(_{x}\)TiO\(_{3}\) and the Dielectric Properties
Authors: Khien Nguyen Van , Lam Vu Dinh , Hong Le Van
Published: September 2014

Ba1-xCaxTiO3 material samples with x changing from zero to 1 were fabricated by the solid state reaction method at a temperature of 1200 oC in the ambient atmosphere. Crystalline structure of the material samples was recorded and identified by X-ray diffraction and Raman scattering. Analyzing the X-ray patterns found that Ba can be completely substituted by Ca with the concentration lower than 11 at%. The frequency dependence of the impedance (C) and AC conductance (G) of all the samples were recorded in a frequency range lower than 10 MHz by using an impedance analyzer HP 4192A. It was found that in the low frequency range lower than 1 MHz the dielectric constant and its loss decrease as Ca substituted for Ba. Besides an abnormal in the frequency dependence of the dielectric constant was observed for all samples in the higher frequency range up to 10 MHz.
The Phase Transition of Half-Skyrmions in the Dense Nuclear Matter
Authors: Viet Nguyen Ai
Published: September 2014

In this paper we have discussed all possible boundary values used in the ordinary Skyrme model. Among the solutions to these boundary conditions the non-skyrmion and skyrmion one exist according to certain choices. The free parameter \(R\) in the boundary value conditions is shown to be related to the density of the nuclear matter in its Wigner-Seitz model. All three types of skyrmion can describe the nucleon in a good agreement with the experimental values of the axial coupling constant and isoscalar radii. However, all three types of skyrmion lead to a large value of the nucleon mass and a too small mass splitting between the nucleon and delta particles. The phase transitions of the skyrmions of Type III are also observed in the numerical computations as the density of the nuclear matter varies.
Neurology in Federico Fellini?s work and life
Authors: Teive Hélio Afonso Ghizoni , Caramelli Paulo , Cardoso Francisco Eduardo Costa
Published: September 2014

The authors present a historical review of the neurological diseases related to the famous moviemaker Federico Fellini. There is an account of diseases depicted on his movies as well as his ischemic stroke and consequent neurological deficit - left spatial neglect.
Comparative morphometric study of the sigmoid sinus sulcus and the jugular foramen
Authors: Ramos Junior Silvio Pereira , Gusmão Sebastião Natanael da Silva , Raso Jair Leopoldo , Nicolato Arthur Adolfo , Santos Marcileia , Caetano Isabela Maciel
Published: September 2014

Objective To compare the right and left sides of the same skulls as far as the described landmarks are concerned, and establish the craniometric differences between them. Method We carried out measurements in 50 adult dry human skulls comparing both sides. Results The sigmoid sinus width at the sinodural angle level was larger on the right side in 78% of the cases and at the level of the digastric notch in 72%. The jugular foramen width was also larger on the right side in 84% of the cases. The sigmoid sinus distance at the level of the digastric notch was larger on the right side in 64% of the cases, and the sigmoid sinus distance at the level of the digastric notch to the jugular foramen was larger on the right side in 70% of the cases. Conclusion Significant craniometric differences were found between both sides of the same skulls.
The far-lateral craniotomy: tips and tricks
Authors: Chaddad Neto Feres , Doria-Netto Hugo Leonardo , Campos Filho José Maria de , Reghin Neto Mateus , Rothon Jr Albert L , Oliveira Evandro de
Published: September 2014

This article intends to describe in a didactical and practical manner the suboccipital far-lateral craniotomy. This is then basically a descriptive text, divided according to the main stages involved in this procedure, and that describes with details how the authors currently perform this craniotomy.
Effects of Alcohol and/or Tobacco Exposure on Spontaneous Alveolar Bone Loss in Rat
Authors: Oballe Harry Juan Rivera , Gaio Eduardo José , Spuldaro Tobias , Cavagni Juliano , Gomez Rosane , Rösing Cassiano Kuchenbecker
Published: September 2014

The aim of the present study was to evaluate the effect of alcohol and/or tobacco exposure on spontaneous alveolar bone loss in Wistar rats. Twenty-four, male, 60 day-old, Wistar rats were assigned to 4 groups: Group 1 received 10 mL/kg of glucose solution (5%). Group 2 received 2 g/kg alcohol (20%). Group 3 was exposed to tobacco smoke (6 cigarettes/60 min). Group 4 received both interventions of groups 2 and 3. Alcohol was given by gastric gavage and cigarette exposure was performed using a forced ventilation chamber. After 30 days, animals were sacrificed and the upper maxillae removed and defleshed. Morphometric analysis of alveolar bone loss (ABL) around the second molar was performed in standardized digital photographs. Statistical analysis was conducted using paired t-test, one-way ANOVA and occurrence of spontaneous periodontal disease (ABL ≥ 0.39 mm) was analyzed by Fisher's exact test. Significant differences in body weight were observed between all groups. Group 2 presented higher body weight as compared to the 3 other groups at 4 weeks (p≤0.05). Mean ABL values were 0.31 mm (±0.08), 0.29 mm (±0.07), 0.33 mm (±0.10), and 0.33 mm (±0.08) for groups 1, 2, 3, and 4, respectively. No significant differences were found among groups. In the analysis of occurrence of periodontal breakdown, alcohol exposure decreased the occurrence of ABL and cigarette exposure increased ABL. The combination of alcohol and cigarette exposure did not differ from the control group. Alcohol consumption decreased the occurrence of periodontal breakdown, while tobacco increased this rate.
Clinical Evaluation of the Whitening Effect of Over-the-Counter Dentifrices on Vital Teeth
Authors: Horn Bruna Andrade , Bittencourt Bruna Fortes , Gomes Osnara Maria Mongruel , Farhat Patrícia Almeida
Published: September 2014

This randomized clinical trial evaluated the whitening potential of commercially available toothpastes. Sixty patients were selected and randomly divided into 4 groups (n=15), according to the dentifrice used: GI (control) - Colgate Total 12, GII - Close-up White Now, GIII: Oral-B 3D White, GIV: Colgate Luminous White. Three daily brushings were performed for 2 to 3 min each, during a period of 15 days. Patients had the color of their teeth evaluated before and after the treatment by means of a spectrophotometer (Vita EasyShade - CIE L*a*b*). Data obtained from L values were analyzed by one-way ANOVA and t test. ∆E was also evaluated to calculate color alteration, by NBS criteria. Mean (standard deviation) of initial values were GI: 82.9 (4.9); GII: 83.9 (5.8); GIII: 83.9 (7.2); GIV: 86.4 (3.4) and final values were GI: 84.1 (6.3); GII: 84.6 (6.1); GIII: 84.2 (7.1); GIV: 88.2 (2.8). In conclusion, the dentifrices showed no lightening action on vital teeth, except for Colgate Luminous White; but according to NBS criteria, there was no noticeable visible change to the patients in any group.
Two-Stage Treatment of Facial Asymmetry Caused by Unilateral Condylar Hyperplasia
Authors: Xavier Samuel Porfírio , Santos Thiago de Santana , Silva Erick Ricardo , Faria Ana Célia , Mello Filho Francisco Verissimo de
Published: September 2014

Condylar hyperplasia (CH) is a rare, self-limiting process manifesting between the first and third decades of life. CH causes facial asymmetry and derangement of the occlusion. Management involves resection of the condylar head and orthognathic surgery. This paper describes the case of a 37-year-old woman with spontaneous onset of CH over a span of approximately 25 years. The condition was managed with resection of the condyle alone, which dramatically improved facial asymmetry and altered the occlusion within a few months of follow up. Orthodontic treatment was then carried out and the patient underwent orthognathic surgery after 3 years. The patient is currently satisfied with her appearance and function and there are no signs of recurrence.
Effect of Composite Containing an Iodonium Salt on the Bond Strength of Brackets to Bovine Enamel
Authors: Soares Eveline Freitas , Costa Ana Rosa , Correr Américo Bortolazzo , Vedovello Silvia Amélia , Vedovello Filho Mário , Ogliari Fabrício Aulo , Moraes Rafael Ratto de , Correr-Sobrinho Lourenço
Published: September 2014

This study investigated the effect of the incorporation of an iodonium salt in experimental composites, on the bond strength of metallic brackets bonded to bovine teeth. Two hundred and seventy bovine teeth were embedded in self-curing acrylic resin and divided into 18 groups (n=15), according to the experimental composite with an iodonium salt at molar concentrations 0 (control), 0.5, or 1%; the light-activation times (8, 20 and 40 s); and the storage times (10 min or 24 h). Metallic brackets were fixed on the tooth surface using experimental composites. Photoactivation was performed with a quartz-tungsten-halogen light-curing unit curing unit for 8, 20 and 40 s. The specimens were stored in distilled water at 37 °C for 10 min or 24 h and submitted to bond strength test at 0.5 mm/min. The data were subjected to three-way ANOVA and Tukey's test (α=0.05). The Adhesive Remnant Index (ARI) was used to classify the failure modes. The shear bond strengths (MPa) at 10 min for light-activation times of 8, 20 and 40 s were: G1 - 4.6, 6.9 and 7.1; G2 - 8.1, 9.2 and 9.9; G3 - 9.1, 10.4 and 10.7; and at 24 h were: G1 - 10.9, 11.1 and 11.7; G2 - 11.8, 12.7 and 14.2; G3 - 12.1, 14.4 and 15.8. There was a predominance of ARI score 3 for groups with 10 min storage time, and ARI score 2 for groups with 24 h storage time. In conclusion, the addition of iodonium salt (C05 and C1) to the experimental composite may increase the bond strength of brackets to bovine enamel using reduced light exposure times
Immunoexpression of PPAR-? and Osteocalcin Proteins for Bone Repair of Critical-Size Defects Treated with Fragmented Autogenous Abdominal Adipose Tissue Graft
Authors: Deliberador Tatiana Miranda , Giovanini Allan Fernando , Lopes Tertuliano Ricardo , Zielak João César , Moro Alexandre , Baratto Filho Flares , Santos Felipe Rychuv , Storrer Carmen L. Mueller
Published: September 2014

Immunoexpression of PPAR-γ and osteocalcin proteins was evaluated for bone repair of critical-size defects (CSDs), created in rat calvaria (n=42) and treated with fragmented abdominal autogenous adipose tissue graft. Three groups (n=14) were formed: C (control - blood clot), AB (autogenous bone) and AT (fragmented adipose tissue). The groups were divided into subgroups (n=7) for euthanasia at 30 and 90 days. Histological and immunohistochemical analyses were performed. Data were subjected to descriptive statistics (mode). A complete bone closure was observed in Group AB 90 days after surgery. In Group C, repair was achieved by the formation of collagen fiber bundles oriented parallel to the wound surface at both post-surgery periods. In Group AT the type of healing was characterized by dense connective tissue containing collagen fiber bundles arranged amidst the remaining adipose tissue, with rare heterotopic bone formation associated with fibrosis and different types of tissue necrosis. Immunostaining of PPAR-γ was not observed in any specimen from Groups C and AB. In Group AT, the immunostaining of PPAR-γ was more evident 30 days after surgery. Immunostaining of osteocalcin was present in all groups and at both postoperative periods. The fragmented autogenous abdominal adipose tissue graft did not favor the repair of critical-size bone defects created surgically in rat calvaria as evidenced by the positive immunostaining of PPAR-γ protein and the negative immunostaining of osteocalcin in the osteoblast-like cells and bone matrix.
Nimesulide-induced fatal acute liver failure in an elderly woman with metastatic biliary adenocarcinoma. A case report
Authors: Bernardes Sara Santos , Souza-Nogueira André , Moreira Estefânia Gastaldello , Kishima Marina Okuyama , Guembarovski Alda Fiorina Maria Losi , Turini Tercilio Luiz , Turini Conceição Aparecida
Published: September 2014

CONTEXT:Nimesulide is a selective inhibitor of the enzyme cyclooxygenase 2. Although considered to be a safe drug, cases of acute hepatitis and fulminant liver failure have been reported in Europe, the United States and South America, especially among elderly female patients. Until now, there had not been any reports in the literature relating to Brazilian subjects.CASE REPORT:An 81-year old female who had been using nimesulide therapy for six days presented hematemesis and epistaxis two days before hospitalization. Clinical examination showed an extensive coagulation disorder, diffuse hematomas, hypotension and tachypnea. Laboratory tests revealed abnormalities in coagulation tests; leukocytosis; reduced platelet, hemoglobin and red blood cell counts; and elevated direct bilirubin, serum aspartate transaminase (AST), gamma-glutamyl transpeptidase (GGT), alkaline phosphatase and renal function biomarkers. Hepatitis B and C tests were not reactive. Carcinoembryonic antigen (CEA), CA-19-9 and CA-125 levels were increased by, respectively, 1,000, 10,000 and 13 fold, whereas the alpha-fetoprotein level was normal, thus indicating a malignant tumor in the bile duct that did not originate from the liver. Thirty-six hours after hospitalization, the patient's condition worsened, leading to death. The necropsy findings included acute hepatitis with hepatocellular collapse, as well as metastasis of a carcinoma, probably from the bile duct.CONCLUSION:Despite the carcinoma presented by the patient, nimesulide use may have contributed towards the fatal acute liver failure. Until this issue has been clarified, caution is required in prescribing nimesulide for liver disease patients.
Ichthyofauna of Seridó/Borborema: a semi-arid region of Brazil
Authors: Silva Márcio Joaquim da , Ramos Telton Pedro Anselmo , Diniz Virginia Dantas , Ramos Robson Tamar da Costa , Medeiros Elvio Sergio Figueredo
Published: September 2014

The Seridó/Borborema region is located between the States Paraíba and Rio Grande do Norte and a priority area for conservation of the Caatinga. This region is under the hydrological influence of the middle portion of Piranhas-Açu River basin. Previous systematic inventories of the ichthyofauna of this Caatinga’s area are not significant. The Caatinga fish fauna is threatened due the advancement of historic anthropogenic activities, mainly agricultural. Furthermore, another relevant aspect is the recent governmental decision of transferring water from São Francisco River to other Northern river basins, which includes the Piranhas-Açu basin. This study performed a systematic survey of the Seridó/Borborema’s ichthyofauna. The sites were sampled during the years 2006 and 2007 (four annual, diurnal samples), using three different types of gear: beach seine nets, cast net and gillnets. We captured 13,009 individuals of 5 orders, 14 families, 28 genera and 35 species of fish. The predominant orders were Characiformes (21 species), Siluriformes (6) and Perciformes (5). The greatest number of species (11) was catch from the family Characidae, followed by Cichlidae (5) and Loricariidae (4). This inventory produced a comprehensive sampling of the middle portion of Piranhas-Açu River basin and its result overcomes the diversity reported in previous studies (22 species) on the same region.
Concepções de uma estética materialista para uma arte transformadora: a superação do caráter abstrato na particularidade do trabalho artístico
Authors: Xavier Wescley Silva , Carrieri Alexandre de Pádua
Published: September 2014

Este artigo tem como objetivo resgatar as bases de uma estética materialista - principalmente, as desenvolvidas por György Lukács - que lance luz sobre a produção artística como elaboração da própria realidade, e que, por consequência, se configure num instrumento de auxílio à superação das contradições materiais. Partimos do pressuposto de que a dominação cultural representa uma extensão do poder que o capital exerce sobre o trabalho, reduzindo as possibilidades de transformação a partir das elaborações artísticas. A partir do movimento dialético entre base e superestrutura, a produção artística como reflexo da realidade pode estabelecer um caráter transformador da vida social, desde que a obra de arte represente de maneira efetiva possibilidades de contrapor e superar as contradições existentes no capital quando recobra seu caráter objetivo na própria vida humana.
Revisitando a controvérsia sobre a transmissibilidade intercultural do conhecimento administrativo
Authors: Motta Paulo Roberto
Published: September 2014

O objetivo deste trabalho é apresentar uma nova perspectiva da controvérsia sobre a transmissibilidade do saber administrativo, normalmente ofuscada pela maior atenção contemporânea ao contingencialismo cultural. A maior interdependência entre as nações gerou novos desafios do saber, necessidades de desenvolvimento e expectativas sobre a oportunidade de novas ideias. A aquisição de hábitos semelhantes fez o contexto mundial parecer cada vez mais uma grande arena de compartilhamento de culturas. A preocupação com a transmissibilidade se acentuou em função do crescimento mais rápido de nações consideradas menos avançadas, assim como das expectativas de transformação das práticas gerenciais. Presume-se ser a transferência do saber um fator relevante para a modernização das instituições públicas e privadas. Neste trabalho se contrapõem duas correntes de pensamento: a primeira assume o conhecimento administrativo como intransferível a outro meio cultural; a segunda o assume como transferível e necessário a outro meio cultural. Por meio da explicitação de novos argumentos teóricos e exemplos de vínculos com a prática gerencial internacional, ele é concluído com várias proposições sobre a transmissibilidade do saber administrativo.
Relações de gênero e estética organizacional: sugestões para estudos sobre relações, cultura e desempenho
Authors: Basso Kenny , Pauli Jandir , Bressan Verônica Paludo
Published: September 2014

Os estudos das relações de gênero e também sobre a estética organizacional podem ter amplas variações, por isso tais temáticas são presentes sob diferentes enfoques nas agendas dos pesquisadores. A consideração estética das organizações vem, ao longo dos anos, ganhando importância nas análises organizacionais, enquanto os estudos das relações de gênero emergem da diversidade de indivíduos que passam a compor as organizações. Este ensaio representa um esforço teórico para identificar intersecções entre essas temáticas para prover novos olhares sobre três diferentes trilhas dos Estudos Organizacionais: relações entre indivíduos e organização; cultura organizacional; e desempenho organizacional. Para tanto, serão apresentados os conceitos de relação de gênero nas organizações e estética organizacional, estudos sobre a relação entre os indivíduos e a organização, cultura organizacional e desempenho da organização, atentando para a discussão sobre possíveis pontos de intersecção entre tais temáticas. Para apresentar as sugestões para futuros estudos, foram englobados ensaios teóricos e trabalhos teórico-empíricos sobre relações de gênero e estética organizacional. Sendo assim, a contribuição deste ensaio recai sobre a agregação de duas literaturas (relações de gênero e estética organizacional) até então não usualmente relacionadas, mas que juntas podem prover contribuições relevantes e representativas aos estudos e análises organizacionais.