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Search Results: 1 - 10 of 31001 matches for " Z. Holanova "
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Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy
P. Samuely,Z. Holanova,P. Szabo,J. Kacmarcik,R. A. Ribeiro,S. L. Bud'ko,P. C. Canfield
Physics , 2003, DOI: 10.1103/PhysRevB.68.020505
Abstract: The Andreev reflection measurements of the superconducting energy gap in the carbon-substituted MgB$_2$ are presented. Despite the strong suppression of the transition temperature by 17 K in comparison with the pure MgB$_2$, the same reduced value of the small superconducting energy gap with $2\Delta/kT_c \approx$ 1.7 has been systematically observed. This indicates that the two band/two gap superconductivity is still preserved here.
Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy
Z. Holanova,P. Szabo,P. Samuely,R. H. T. Wilke,S. L. Bud'ko,P. C. Canfield
Physics , 2004, DOI: 10.1103/PhysRevB.70.064520
Abstract: Point-contact measurements on the carbon-substituted Mg(B$_{1-x}$C$_x$)$_2$ filament/powder samples directly reveal a retention of the two superconducting energy gaps in the whole doping range from $x = 0$ to $x \approx 0.1$. The large gap on the $\sigma$-band is decreased in an essentially linear fashion with increasing the carbon concentrations. The changes in the the small gap $\Delta_{\pi}$ up to 3.8 % C are proportionally smaller and are more difficult to detect but for the heavily doped sample with $x \approx 0.1$ and $T_c = 22$ K both gaps are still present, and significantly reduced, consistent with a strong essentially linear, reduction of each gap with the transition temperature.
Historical and mathematical aspects of iterative solutions for Monte Carlo simulations
Was, Z.
High Energy Physics - Phenomenology , 2008,
Abstract: Over the last 25 years Monte Carlo programs were being developped in Cracow in the group guided by Prof. Stanislaw Jadach. Many of those programs became standard in their application domains. In the following let us review some aspects of such projects which were probably at the foundation of their success. We will concentrate on mathematical aspects of their design and history of their construction. It is rather difficult to cover 25 years of the research in a single talk. That is why, I have organized my presentation around Monte Carlo PHOTOS but stressing its relation to other activities and projects often realized together with Prof. Jadach. Many of omitted aspects will find their way into other perentations collected in this volume. I will concentrate on issues related to phasespace parametrization and spin amplitudes as used in our Monte Carlo programs such as MUSTRAAL, TAUOLA or KKMC and their similarities and differences with respect to solution used in PHOTOS.
Trefoil knot and ad-hoc classification of elementary fields in the Standard Model
Z. Was
Physics , 1997, DOI: 10.1016/S0370-2693(97)01346-4
Abstract: We present an arbitrary model based on the trefoil knot to construct objects of the same spectrum as that of elementary particles. It includes `waves' and three identical sets of sources. Due to Lorentz invariance, `waves' group into 3 types of 1, 3 and 8 objects and `sources' consists of 3 identical sets of 30+2 elements, which separate into: 1 * 1 * 2 + 1 * 2 * 2 + 3 * 2 * 2 + 3 * 1 * 2 + 3 * 1 * 2 and another 1 * 1 * 2 group (which does not match classification of the Standard Model fields). On the other hand, there is no room in this construction for objects directly corresponding to Higgs-like degrees of freedom.
TAUOLA the library for tau lepton decay, and KKMC/KORALB/KORALZ/... status report
Z. Was
Physics , 2000, DOI: 10.1016/S0920-5632(01)01200-2
Abstract: The status of the Monte Carlo programs for the simulation of the $\tau$ lepton production in high energy accelerator experiments and decay is reviewed. In particular, the status of the following packages is discussed: (i) TAUOLA for tau-lepton decay, (ii) PHOTOS for radiative corrections in decays, (iii) KORALB, KORALZ, KKMC packages for tau-pair production in e+e- collisions and (iv) universal interface of TAUOLA for the decay of tau-leptons produced by``any'' generator. Special emphasis on requirements from new and future experiments is given. Some considerations about the software organization necessary to keep simultaneously distinct physics initializations for TAUOLA are also included.
New hadronic currents in TAUOLA: for confrontation with the experimental data
Z. Was
Physics , 2012, DOI: 10.1016/j.nuclphysbps.2012.02.040
Abstract: The status of implementation of new hadronic currents into the Monte Carlo system for simulation of tau-lepton production and decay in high-energy accelerator experiments is reviewed. Since the tau-lepton conference in 2010 substantial progress was achieved: (i) For the TAUOLA Monte Carlo generator of tau-lepton decays, automated and simultaneous use of many versions of form factors for the calculation of optional weights for fits was developed and checked to work in the Belle and BaBar software environment. Alternative parameterizations of hadronic currents based on the Resonance Chiral approach are available now. This was achieved for more than 88% of the total tau hadronic width. (ii) the TAUOLA universal interface based on HepMC (the C++ event record) is available. This is the case for C++ users of PHOTOS Monte Carlo for radiative corrections in decays, as well. An algorithm for weighted events to explore spin effects in analysis of hard processes was prepared. (iii) Kernels featuring a complete first-order matrix element are available now for PHOTOS users interested in decays of Z and W bosons. New tests with different options of matrix elements for those and for Kl3 decays are available as well. Presented results illustrate the status of the projects performed in collaboration with Zofia Czyczula, Nadia Davidson, Tomasz Przedzinski, Olga Shekhovtsova, Elzbieta Richter-Was, Pablo Roig, Qingjun Xu and others.
Computer Aided Modeling and Deign of a New Magnetic Sealing Mechanism in Engineering Applications  [PDF]
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.21003
Abstract: This article introduces a new type of magnetic sealing mechanism that reduces the lubrication oil pollution and media gaseous leakage in general reciprocating machinery including air compressors and refrigerators. The feasible function and reliable performance of this new sealing mechanism are introduced and analyzed in this paper. The computer aided design, modeling and analysis are being used to study this new sealing mechanism, and the prototype of this sealing mechanism is being tested. The study indicated the proper function of this sealing mechanism. The major advantages of this sealing mechanism include: improved sealing capacity to prevent the gaseous leakage and oil leakage, simple and compact in structure, lower precision requirement on surfaces of reciprocating pistons and shafts in production and manufacturing, and longer services in sealing life span. Also there is almost no frictional loss during the reciprocating motion of piston or shaft.
Soot and Nanomaterials Synthesis in the Flame  [PDF]
Z. Mansurov
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.21001

The general scheme of conversion of hydrocarbon fuels with new experimental data on the formation of fullerenes and graphenes taking into account the pressure effect is proposed for the fuel-rich flames. It is shown that the formation of fullerenes is important to the corresponding spatial orientation of PAH, possible at low pressures. The formation of hydrophobic soot surface on silicon and nickel substrates during combustion of propane-oxygen flame was studied. It is established that the hydrophobic properties are due to the presence of soot particles in the form nanobeads. The photovoltaic properties of solar cells coated by nickel oxide nanoparticles synthesized in counter flow propane-air flame. It is revealed that coated the surface of a silicon solar cell by nickel oxide nanoparticles results in the increase in solar cell efficiency by 3%.

The Cancer Patient Drowns in the Waves of Homeostatic Disorder  [PDF]
Z. Douvlis
Journal of Cancer Therapy (JCT) , 2018, DOI: 10.4236/jct.2018.99056
Abstract: Neoplastic cells are formed as a result of reprogramming the gene expression. It is only when these cells are classified as non-local by the normal cells that confrontation occurs, and thus cancer begins as a disease. The tumorogenic degradation of the skeletal muscle plays a highly important role in the pathomechanism of the disease. It transforms a diminishing differentiation into an increasing homeostatic disorder, and is forced to provide energy to the malignant cells. This characterizes the completed form of the pathomechanism. Blocking the pathomechanism is the goal of a therapy that can be realized on two levels: At the level of reprogramming of the gene expression, which initiates the formation of neoplastic cells, a “reprogramming” of the reprogramming of gene expression could be achieved by altering the genomic flow of information. Increased anabolism (corresponding to the nutrient surplus) as well as increased catabolism (corresponding to nutrient) could lead to respective changes of the flows of genomic information. These opposing flows in a patient could be expected to result in interference or a shearing effect. Patients with acromegaly exhibit a 9.25% increased neoplasia prevalence, whilst patients with hyperthyroidism have 8.41% increased neoplasia prevalence. Patients with acromegaly and hyperthyroidism have a lower prevalence of neoplasia of 3.30%, i.e. the chance of these patients not contracting cancer is three times greater than patients with either only acromegaly or only hyperthyroidism. At the level of tumorogenic degradation of skeletal muscle, inhibition of muscle degradation by means of hypertriglyceridemia results in a significant prolongation of the life of carcinoma patients. This is based on the fact that inhibition of muscle degradation occurs after infusion of triglyceride emulsion. In the case of S. sanguinis bacteremia, there may be an interaction between enzymes from S. sanguinis, from the digestive tract and from the tumor. The source of infection determines the inactivation of the tumor enzyme and thus suppresses tumor development.
Unsteady MHD Mixed Convection Flow with Slip of a Nanofluid in the Stagnation Region of an Impulsively Rotating Sphere with Effects of Thermal Radiation and Convective Boundary Conditions  [PDF]
Sameh E. Ahmed, Z. Z. Rashed
World Journal of Mechanics (WJM) , 2018, DOI: 10.4236/wjm.2018.85011
Abstract: Unsteady magnetohydrodynamic mixed convection flow of an electrically conducting nanofluid in a stagnation region of a rotating sphere is studied numerically in the present article. Slip and convective boundary conditions are imposed to surface of the sphere and the thermal radiation effects are taken into account. The nanofluid is simulated using Buongiorno’s nanofluid model and the nanofluid particle fraction on the boundary is considered to be passively rather than actively controlled. Non-similar solutions are applied on the governing equations and the MATLAB function bvp4c is used to solve the resulting system. Effects of the key-parameters such as slip parameter, Biot number, radiation parameter, rotation parameter, Lewis number and Brownian motion parameter on the fluid flow, temperature and nanoparticle volume fraction characteristics are examined. Details of the numerical solution and a comprehensive discussion with the physical meaning for the obtained results are performed. The results indicated that the increase in slip parameter enhances the velocity profiles, while it decreases the temperature distributions. Also, the increase in either slip parameter or Biot number causes an improvement in the rate of heat transfer.
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