651 research outputs found
Revisiting the symmetric reactions for synthesis of super-heavy nuclei of Z⩾120
AbstractExtensive efforts have been made experimentally to reach nuclei in the super-heavy mass region of Z=110 and above with suitable choices of projectile and target nuclei. The cross sections for production of these nuclei are seen to be in the range of a few picobarn or less, and pose great experimental challenges. Theoretically, there have been extensive calculations for highly asymmetric (hot-fusion) and moderately asymmetric (cold-fusion) collisions and only a few theoretical studies are available for near-symmetric collisions to estimate the cross sections for production of super-heavy nuclei. In the present article, we revisit the symmetric heavy ion reactions with suitable combinations of projectile and target nuclei in the rare-earth region, that will lead to super-heavy nuclei of Z⩾120 with measurable fusion cross sections
Analytic Well Behaved Charged Relativistic Super-dense Star Models
AbstractIn the present article, we have obtained a new class of well behaved charged super-dense star models after prescribing a particular form of the metric potential and electric intensity. The metric describing the super-dense stars model joins smoothly with the Reissner-Nordstrom metric at the pressure free boundary. The interior of the stars possess there energy density, pressure, pressure-density ratio and velocity of sound to be monotonically decreasing towards the pressure free interfac
Achieving superior organizational performance via big data predictive analytics: A dynamic capability view
The art of unwinding voluminous data expects the expertise in analyzing meaningful decisions out of the acquired information. To encounter new age challenges, practitioners are trying hard to shatter the constraints and work edge-to-edge to achieve higher performance (Market, Financial and Operational performance). It is evident that organizations desire to exploit maximum of their injected resources, but often fail to reap their actual potential. Developing resource-based capabilities stands out to be the most concerned aspect for the firms in recent times, and the same is studied by the previous scholars. In the dearth of literature, it is challenging to find out evidence which marks up the effect of strategic resources in the development of dynamic organizational capability. This study is a two-fold attempt to examine the relationship between organizational capabilities, i.e. big data predictive analytics while achieving superior organizational performance; also, examining the effect of control variables on superior organizational of performance. We tested our research hypotheses using cross-sectional data of 209 responses collected using pre-tested single-informant questionnaire. The results underpin criticality human factor while developing analytical capabilities dynamic in nature in the process of achieving superior performance
Effect of seasonal spectral variations on performance of three different photovoltaic technologies in India
The accuracy of outdoor performance of a photovoltaic (PV) array can be improved by considering the spectral effects. In this paper, the impact of seasonal spectral variations on the three different silicon PV technologies: single junction amorphous silicon (a-Si), Hetero-junction with Intrinsic Thin-layer (HIT) and multi crystalline silicon (mc-Si) has been presented first time in Indian environmental conditions. The spectral effect on HIT PV module technology has been presented first time along with the first simultaneous study of variation in spectral indicators by useful fraction (UF), average photon energy (APE) and spectral mismatch factor (MMF), based on monthly and seasonal data. The maximum observed variation in UF was 26.4, 8.2, 10.8 %, while in MMF, variation was up to 24.7, 7.6, 8.2 % for a-Si, HIT and mc-Si, respectively, and in APE variation was up to 15.3 %. Among all three technology modules, first time reported HIT technology showed the least variation while maximum variation was observed in a-Si technology. The observed spectral effect variations have been discussed on Performance Ratio and compared with reported results of other global sites. The value and trends of spectral parameters are important to understand the effect of spectral variation on different technology. This study is especially important in Indian subcontinent perspective because of the strong monsoon season, where observed variation in the spectrum-related parameter found to be highest among all the seasons
Critical Behavior of the Ferromagnetic Ising Model on a Sierpinski Carpet: Monte Carlo Renormalization Group Study
We perform a Monte Carlo Renormalization Group analysis of the critical
behavior of the ferromagnetic Ising model on a Sierpi\'nski fractal with
Hausdorff dimension . This method is shown to be relevant to
the calculation of the critical temperature and the magnetic
eigen-exponent on such structures. On the other hand, scaling corrections
hinder the calculation of the temperature eigen-exponent . At last, the
results are shown to be consistent with a finite size scaling analysis.Comment: 16 pages, 7 figure
Rapidity distribution as a probe for elliptical flow at intermediate energies
Interplay between the spectator and participant matter in heavy-ion
collisions is investigated within isospin dependent quantum molecular dynamics
(IQMD) model in term of rapidity distribution of light charged particles. The
effect of different types and size rapidity distributions is studied in
elliptical flow. The elliptical flow patterns show important role of the nearby
spectator matter on the participant zone. This role is further explained on the
basis of passing time of the spectator and expansion time of the participant
zone. The transition from the in-plane to out-of-plane is observed only when
the mid-rapidity region is included in the rapidity bin, otherwise no
transition occurs. The transition energy is found to be highly sensitive
towards the size of the rapidity bin, while weakly on the type of the rapidity
distribution. The theoretical results are also compared with the experimental
findings and are found in good agreement.Comment: 8 figure
Microscopic Description of Super Heavy Nuclei
The results of extensive microscopic Relativistic Mean Field (RMF)
calculations for the nuclei appearing in the alpha - decay chains of recently
discovered superheavy elements with Z = 109 to 118 are presented and discussed.
The calculated ground state properties like total binding energies, Q values,
deformations, radii and densities closely agree with the corresponding
experimental data, where available. The double folding (t-rho-rho)
approximation is used to calculate the interaction potential between the
daughter and the alpha, using RMF densities along with the density dependent
nucleon - nucleon interaction (M3Y). This in turn, is employed within the WKB
approximation to estimate the half lives without any additional parameter for
alpha - decay. The half lives are highly sensitive to the Q values used and
qualitatively agree with the corresponding experimental values. The use of
experimental Q values in the WKB approximation improves the agreement with the
experiment, indicating that the resulting interaction potential is reliable and
can be used with confidence as the real part of the optical potential in other
scattering and reaction processes.Comment: Accepted for publication in Annals of Physics (NY
Classes of exact Einstein-Maxwell solutions
We find new classes of exact solutions to the Einstein-Maxwell system of
equations for a charged sphere with a particular choice of the electric field
intensity and one of the gravitational potentials. The condition of pressure
isotropy is reduced to a linear, second order differential equation which can
be solved in general. Consequently we can find exact solutions to the
Einstein-Maxwell field equations corresponding to a static spherically
symmetric gravitational potential in terms of hypergeometric functions. It is
possible to find exact solutions which can be written explicitly in terms of
elementary functions, namely polynomials and product of polynomials and
algebraic functions. Uncharged solutions are regainable with our choice of
electric field intensity; in particular we generate the Einstein universe for
particular parameter values.Comment: 16 pages, To appear in Gen. Relativ. Gravi
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Synthesis of accelerograms compatible with the Chinese GB 50011-2001 design spectrum via harmonic wavelets: artificial and historic records
A versatile approach is employed to generate artificial accelerograms which satisfy the compatibility criteria prescribed by the Chinese aseismic code provisions GB 50011-2001. In particular, a frequency dependent peak factor derived by means of appropriate Monte Carlo analyses is introduced to relate the GB 50011-2001 design spectrum to a parametrically defined evolutionary power spectrum (EPS). Special attention is given to the definition of the frequency content of the EPS in order to accommodate the mathematical form of the aforementioned design spectrum. Further, a one-to-one relationship is established between the parameter controlling the time-varying intensity of the EPS and the effective strong ground motion duration. Subsequently, an efficient auto-regressive moving-average (ARMA) filtering technique is utilized to generate ensembles of non-stationary artificial accelerograms whose average response spectrum is in a close agreement with the considered design spectrum. Furthermore, a harmonic wavelet based iterative scheme is adopted to modify these artificial signals so that a close matching of the signals’ response spectra with the GB 50011-2001 design spectrum is achieved on an individual basis. This is also done for field recorded accelerograms pertaining to the May, 2008 Wenchuan seismic event. In the process, zero-phase high-pass filtering is performed to accomplish proper baseline correction of the acquired spectrum compatible artificial and field accelerograms. Numerical results are given in a tabulated format to expedite their use in practice
Compressional-mode resonances in the molybdenum isotopes: Emergence of softness in open-shell nuclei near A=90
"Why are the tin isotopes soft?" has remained, for the past decade, an open
problem in nuclear structure physics: models which reproduce the isoscalar
giant monopole resonance (ISGMR) in the "doubly-closed shell" nuclei, Zr
and Pb, overestimate the ISGMR energies of the open-shell tin and
cadmium nuclei, by as much as 1 MeV. In an effort to shed some light onto this
problem, we present results of detailed studies of the ISGMR in the molybdenum
nuclei, with the goal of elucidating where--and how--the softness manifests
itself between Zr and the cadmium and tin isotopes. The experiment was
conducted using the Mo() reaction at
MeV. A comparison of the results with relativistic,
self-consistent Random-Phase Approximation calculations indicates that the
ISGMR response begins to show softness in the molybdenum isotopes beginning
with .Comment: Accepted for publication to Physics Letters
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