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排序方式: 共有199条查询结果,搜索用时 15 毫秒
101.
Ghosh S Nayek P Roy SK Gangopadhyay R Rahaman Molla M Majumder TP 《The European physical journal. E, Soft matter》2011,34(4):35-6
A detailed comparative study of the dielectric and electro-optical properties of a ferroelectric liquid crystal (FLC) and
FLC after having doped with conducting polymer Poly (3,4-ethylenedioxythiophene) (PEDOT) nanotubes is done. The electro-optic
study reveals a lower electrical response time, rotational viscosity and spontaneous polarization in the FLC/PEDOT nanocomposite
system. By fitting the capacitance with voltage in a Preisach model, four dipolar species in both FLC and composites system
have been obtained. The orientation of the four dipolar species in the composites system is such that the effective dipole
moment in the transverse direction of the FLC molecule is less than that in FLC compound. 相似文献
102.
J. Rissanen V. -V. Elomaa T. Eronen J. Hakala A. Jokinen S. Rahaman S. Rinta-Antila J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2007,34(2):113-118
The feasibility of the JYFLTRAP for in-trap spectroscopy has been studied. Several internally converted transitions have been
measured for isomers of fission products with good accuracy. High-resolution spectroscopic data free of source effects have
been obtained proving that trapped radioactive ions can provide excellent conversion electron sources. The shortest-lived
isomer studied in this work was 117m
Pd with a half-life of 19.1ms, for which a superior peak-to-total ratio and an excellent line shape at the 9.9keV conversion
electron line have been observed. Detection efficiencies and related phenomena of the present setup are analyzed. 相似文献
103.
C. Rauth D. Ackermann G. Audi M. Block A. Chaudhuri S. Eliseev F. Herfurth F. P. Heßberger S. Hofmann H.-J. Kluge A. Martín G. Marx M. Mukherjee J. B. Neumayr W. R. Plaß S. Rahaman D. Rodríguez L. Schweikhard P. G. Thirolf G. Vorobjev C. Weber 《The European physical journal. Special topics》2007,150(1):329-335
104.
A. A. Usmani Z. Hasan F. Rahaman Sk. A. Rakib Saibal Ray Peter K. F. Kuhfittig 《General Relativity and Gravitation》2010,42(12):2901-2912
This paper discusses a new type of thin-shell wormhole constructed by applying the cut-and-paste technique to two copies of
a charged black hole in generalized dilaton-axion gravity, which was inspired by low-energy string theory. After analyzing
various aspects of this thin-shell wormhole, we discuss its stability to linearized spherically symmetric perturbations. 相似文献
105.
A. Jokinen C. Weber T. Eronen V. -V. Elomaa U. Hager J. Hakala S. Rahaman S. Rinta-Antila J. Rissanen J. Äystö 《Hyperfine Interactions》2006,173(1-3):143-151
JYFLTRAP is a Penning trap system at the accelerator laboratory in Jyväskylä, Finland that enables high-precision experiments with stored, exotic species that are produced at the IGISOL facility. On one hand, these can be performed within the trap itself, like e.g. mass spectrometry. On the other hand, the trap can be used to provide the highly purified species for further experiments, e.g. for trap-assisted nuclear decay spectroscopy. This contribution focuses on these two possible applications with the presentation of some recent results on superallowed beta decays. 相似文献
106.
Farook Rahaman Ritabrata Biswas Hafiza Ismat Fatima Nasarul Islam 《International Journal of Theoretical Physics》2014,53(2):370-379
It is still a challenging problem to the theoretical physicists to know the exact nature of the galactic dark matter which causes the galactic rotational velocity to be more or less a constant. We have proposed that the dark matter as an effect of f(T) gravity. Assuming the flat rotation curves as input we have shown that f(T) gravity can explain galactic dynamics. Here, we don’t have to introduce dark matter. Spacetime metric inspired by f(T) gravity describes the region up to which the tangential velocity of the test particle is constant. This inherent property appears to be enough to produce stable circular orbits as well as attractive gravity. 相似文献
107.
Quantum mechanical estimation of Abraham hydrogen bond parameters using 1:1 donor–acceptor complexes
Obaidur Rahaman Douglas J. Doren Dominic M. Di Toro 《Journal of Physical Organic Chemistry》2014,27(10):783-793
Hydrogen bond donor strength () and acceptor strength () have been successfully used in models of many environmental and chemical systems, and a number of computational methods have been developed to predict them. In this work, a quantum chemical Møller–Plesset perturbation (MP2) method is applied to estimate the binding free energies (ΔGhbond) of several 1:1 hydrogen‐bonded complexes. A correlation between the binding free energies and hydrogen bond strength is established. This relationship can be used to develop an accurate computational model for predicting and using binding free energies. The accuracy of the method in predicting Abraham (root mean squared deviation (RMSD) = 0.0693) and (RMSD = 0.0677) are comparable to the empirical, fragment‐based ABSOLV method (RMSD = 0.1144 and 0.1281 for and , respectively). The binding free energy has been decomposed into its thermodynamic components, and it is demonstrated that the linear relationships in the dataset and the existence of magic point can be attributed to a constant entropy of reaction. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
108.
F. Rahaman Peter K. F. Kuhfittig K. Chakraborty M. Kalam D. Hossain 《International Journal of Theoretical Physics》2011,50(9):2655-2665
This paper discusses a new model for galactic dark matter by combining an anisotropic pressure field corresponding to normal
matter and a quintessence dark energy field having a characteristic parameter ω
q
such that
-1 < wq < -\frac13-1<\omega_{q}< -\frac{1}{3}. Stable stellar orbits together with an attractive gravity exist only if ω
q
is extremely close to
-\frac13-\frac{1}{3}, a result consistent with the special case studied by Guzman et al. (Rev. Mex. Fis. 49:303, 2003). Less exceptional forms of quintessence dark energy do not yield the desired stable orbits and are therefore unsuitable
for modeling dark matter. 相似文献
109.
In this paper we have discussed geodesics and the motion of test particle in the gravitational field of noncommutative charged black hole spacetime. The motion of massive and massless particle have been discussed seperately. A comparative study of noncommutative charged black hole and usual Reissner—Nordström black hole has been done. The study of effective potential has also been included. Finally, we have examined the scattering of scalar waves in noncommutative charged black hole spacetime. 相似文献
110.
Mubasher Jamil Farook Rahaman Mehedi Kalam 《The European Physical Journal C - Particles and Fields》2009,60(1):149-156
The standard model of cosmology is investigated using a time-dependent cosmological constant Λ and Newton gravitational constant G. The total energy content is described by the modified Chaplygin gas equation of state. It is found that the time-dependent
constants coupled with the modified Chaplygin gas interpolate between the earlier matter to the later dark-energy dominated
phase of the universe. We also achieve a convergence of the parameter ω→−1, almost at the present time. Thus our model fairly alleviates the cosmic-coincidence problem, which demands ω=−1 at the present time. 相似文献