607 research outputs found
Synthesis and liquid crystalline behaviour of substituted (E)-phenyl-4-(phenyldiazenyl) benzoate derivatives and their photo switching ability
Azobenzene derivatives containing phenyl/4-halogen-phenyl 4-{(E)-[4-(pent-4-en-1-yloxy)phenyl]diazenyl}benzoate group with different electronegative substituent (H, F, Cl, Br and I) at other end was synthesised. These azo-based benzoate derivatives have been characterised by FTIR, 1H-NMR, 13C-NMR, elemental analyser, POM and UV-Vis spectroscopy. Photosaturation at 358 nm obtained after 82 s of UV irradiation and the longest thermal back relaxation time of 45 h recorded by UV-Vis. The azo derivative could be possible photolock under UV light, as observed by the improved thermal back relaxation time. The resulting photolockable chain of azobenzene might prove valuable in the development of optical device application. These azobenzene moieties also exhibit liquid crystalline behaviour with respect to the halogen substitution as an electron withdrawing group shows that strong structure property relationship exists among them
Draft genome sequence of a novel actinobacterium from the family Intrasporangiaceae isolated from Signy Island, Antarctica
Actinobacterium strain S63T isolated from a soil sample
collected from Spindrift Col on Signy Island
(South Orkney Islands, maritime Antarctic) is a new
species of the Intrasporangiaceae family. Here we
report a draft genome sequence with an approximate
size of 5 Mbp contained in 54 contigs (69.33% GC
content). Preliminary analysis revealed the presence
of cold active protein coding sequences, which may
indicate an adaptation to the harsh polar environment
from which the strain was isolated
Observations of quasi-periodic solar X-ray emission as a result of MHD oscillations in a system of multiple flare loops
We investigate the solar flare of 20 October 2002. The flare was accompanied
by quasi-periodic pulsations (QPP) of both thermal and nonthermal hard X-ray
emissions (HXR) observed by RHESSI in the 3-50 keV energy range. Analysis of
the HXR time profiles in different energy channels made with the Lomb
periodogram indicates two statistically significant time periods of about 16
and 36 seconds. The 36-second QPP were observed only in the nonthermal HXR
emission in the impulsive phase of the flare. The 16-second QPP were more
pronounced in the thermal HXR emission and were observed both in the impulsive
and in the decay phases of the flare. Imaging analysis of the flare region, the
determined time periods of the QPP and the estimated physical parameters of
magnetic loops in the flare region allow us to interpret the observations as
follows. 1) In the impulsive phase energy was released and electrons were
accelerated by successive acts with the average time period of about 36 seconds
in different parts of two spatially separated, but interacting loop systems of
the flare region. 2) The 36-second periodicity of energy release could be
caused by the action of fast MHD oscillations in the loops connecting these
flaring sites. 3) During the first explosive acts of energy release the MHD
oscillations (most probably the sausage mode) with time period of 16 seconds
were excited in one system of the flare loops. 4) These oscillations were
maintained by the subsequent explosive acts of energy release in the impulsive
phase and were completely damped in the decay phase of the flare.Comment: 14 pages, 4 figure
Lowest-Landau-level theory of the quantum Hall effect: the Fermi-liquid-like state
A theory for a Fermi-liquid-like state in a system of charged bosons at
filling factor one is developed, working in the lowest Landau level. The
approach is based on a representation of the problem as fermions with a system
of constraints, introduced by Pasquier and Haldane (unpublished). This makes
the system a gauge theory with gauge algebra W_infty. The low-energy theory is
analyzed based on Hartree-Fock and a corresponding conserving approximation.
This is shown to be equivalent to introducing a gauge field, which at long
wavelengths gives an infinite-coupling U(1) gauge theory, without a
Chern-Simons term. The system is compressible, and the Fermi-liquid properties
are similar, but not identical, to those in the previous U(1) Chern-Simons
fermion theory. The fermions in the theory are effectively neutral but carry a
dipole moment. The density-density response, longitudinal conductivity, and the
current density are considered explicitly.Comment: 32 pages, revtex multicol
Results of Integrated Investigation of Collapse Sinkhole in Sarkayevo Village
ĐŃĐŸĐČĐ”ĐŽĐ”ĐœŃ ĐșĐŸĐŒĐżĐ»Đ”ĐșŃĐœŃĐ” ĐłĐ”ĐŸĐ»ĐŸĐłĐŸ-ĐłĐ”ĐŸŃОзОŃĐ”ŃĐșОД ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ ĐșĐ°ŃŃŃĐŸĐČĐŸĐłĐŸ ĐżŃĐŸĐČала ĐœĐ° ŃĐ”ŃŃĐžŃĐŸŃОО ĐŽĐ”ŃĐ”ĐČĐœĐž ĐĄĐ°ŃĐșĐ°Đ”ĐČĐŸ. ĐĐŸĐ»ŃŃĐ”ĐœĐœŃĐ” гОЎŃĐŸĐłĐ”ĐŸĐ»ĐŸĐłĐžŃĐ”ŃĐșОД ĐŽĐ°ĐœĐœŃĐ” ŃĐČОЎДŃДлŃŃŃĐČŃŃŃ ĐŸ Đ»ĐŸĐșĐ°Đ»ŃĐœĐŸĐč ĐșĐŸĐœŃĐ”ĐœŃŃĐ°ŃОО ĐżĐŸŃĐŸĐșĐ° ĐżĐŸĐŽĐ·Đ”ĐŒĐœŃŃ
ĐČĐŸĐŽ ĐœĐ° ОзŃŃĐ°Đ”ĐŒĐŸĐŒ ŃŃĐ°ŃŃĐșĐ” Đž ĐżĐŸĐČŃŃĐ”ĐœĐœĐŸĐŒ ŃĐŸĐŽĐ”ŃĐ¶Đ°ĐœĐžĐž ŃŃĐ»ŃŃĐ°Ń-ĐžĐŸĐœĐ° ĐČ ĐżŃĐŸĐ±Đ°Ń
ĐČĐŸĐŽŃ, ŃŃĐŸ ĐżĐŸĐŽŃĐČĐ”ŃĐ¶ĐŽĐ°Đ”Ń Đ·Đ°ĐșĐ»ŃŃĐ”ĐœĐžĐ” ĐŸ ĐșĐ°ŃŃŃĐŸĐČĐŸĐŒ ĐżŃĐŸĐžŃŃ
ĐŸĐ¶ĐŽĐ”ĐœĐžĐž ĐżŃĐŸĐČала. ĐĐ”ĐŸŃОзОŃĐ”ŃĐșОД ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ ĐżĐŸĐ·ĐČĐŸĐ»ĐžĐ»Đž ĐŸĐżŃДЎДлОŃŃ ĐŸŃĐœĐŸĐČĐœŃĐ” паŃĐ°ĐŒĐ”ŃŃŃ ĐłĐ”ĐŸĐ»ĐŸĐłĐžŃĐ”ŃĐșĐŸĐłĐŸ ŃŃŃĐŸĐ”ĐœĐžŃ ŃŃĐ°ŃŃĐșĐ°, ĐżŃĐŸŃлДЎОŃŃ ĐżĐŸĐ»ĐŸĐ¶Đ”ĐœĐžĐ” Đ·ĐŸĐœŃ ĐœĐ°ŃŃŃĐ”ĐœĐœĐŸŃŃĐž ĐżĐŸŃĐŸĐŽ ĐČблОзО ĐżŃĐŸĐČала ĐœĐ° ŃазлОŃĐœŃŃ
глŃĐ±ĐžĐœĐ°Ń
Đž ĐČŃЎДлОŃŃ ŃŃĐ°ŃŃĐșĐž Ń ŃазлОŃĐœĐŸĐč ŃŃĐ”ĐżĐ”ĐœŃŃ ĐșĐŸĐŒĐżĐ°ĐșŃĐœĐŸŃŃĐž ĐłŃŃĐœŃĐ°. ĐĐŸ ŃДзŃĐ»ŃŃĐ°ŃĐ°ĐŒ ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ ĐŽĐ°ĐœŃ ŃĐ”ĐșĐŸĐŒĐ”ĐœĐŽĐ°ŃОО ĐŽĐ»Ń ĐŽĐ”ŃĐ°Đ»ŃĐœĐŸĐłĐŸ ОзŃŃĐ”ĐœĐžŃ ŃŃĐ°ŃŃĐșĐ° Ń ŃДлŃŃ ĐżŃĐ”ĐŽĐŸŃĐČŃĐ°ŃĐ”ĐœĐžŃ ĐČĐŸĐ·ĐœĐžĐșĐœĐŸĐČĐ”ĐœĐžŃ ĐŸĐżĐ°ŃĐœŃŃ
ŃĐžŃŃĐ°ŃĐžĐč ĐżŃĐž ĐŽĐ°Đ»ŃĐœĐ”ĐčŃĐ”ĐŒ ŃĐ°Đ·ĐČĐžŃОО ĐșĐ°ŃŃŃĐ°.The integrated investigations of karstic collapse sinkhole were conducted at the area of Sarkayevo village. The obtained hydrogeologic data show the local concentration of underground water flow at the investigated site, and high sulfate ion content in the water samples that suggests that a sinkhole is karstic in nature. Geophysical investigations allowed determining basic parameters of the site geological structure, to reveal the depth distribution of the disturbed ground in vicinity of the sinkhole, and delineate zones of different soil compaction. The recommendations for detail site study, aimed to the mitigation of further karst development hazards, are presented
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In-well sediment incubators to evaluate microbial community stability and dynamics following bioimmobilization of uranium
Theory of Two-Dimensional Quantum Heisenberg Antiferromagnets with a Nearly Critical Ground State
We present the general theory of clean, two-dimensional, quantum Heisenberg
antiferromagnets which are close to the zero-temperature quantum transition
between ground states with and without long-range N\'{e}el order. For
N\'{e}el-ordered states, `nearly-critical' means that the ground state
spin-stiffness, , satisfies , where is the
nearest-neighbor exchange constant, while `nearly-critical' quantum-disordered
ground states have a energy-gap, , towards excitations with spin-1,
which satisfies . Under these circumstances, we show that the
wavevector/frequency-dependent uniform and staggered spin susceptibilities, and
the specific heat, are completely universal functions of just three
thermodynamic parameters. Explicit results for the universal scaling functions
are obtained by a expansion on the quantum non-linear sigma model,
and by Monte Carlo simulations. These calculations lead to a variety of
testable predictions for neutron scattering, NMR, and magnetization
measurements. Our results are in good agreement with a number of numerical
simulations and experiments on undoped and lightly-doped .Comment: 81 pages, REVTEX 3.0, smaller updated version, YCTP-xxx
Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in âs = 7 TeV pp collisions with the ATLAS detector
A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fbâ1 of protonâproton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results
Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC
Measurements of inclusive jet suppression in heavy ion collisions at the LHC
provide direct sensitivity to the physics of jet quenching. In a sample of
lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated
luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with
a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the
transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the
anti-kt algorithm with values for the distance parameter that determines the
nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of
the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp.
Jet production is found to be suppressed by approximately a factor of two in
the 10% most central collisions relative to peripheral collisions. Rcp varies
smoothly with centrality as characterized by the number of participating
nucleons. The observed suppression is only weakly dependent on jet radius and
transverse momentum. These results provide the first direct measurement of
inclusive jet suppression in heavy ion collisions and complement previous
measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables,
submitted to Physics Letters B. All figures including auxiliary figures are
available at
http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02
Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment
This paper describes an analysis of the angular distribution of W->enu and
W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with
the ATLAS detector at the LHC in 2010, corresponding to an integrated
luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and
the missing transverse energy, the W decay angular distribution projected onto
the transverse plane is obtained and analysed in terms of helicity fractions
f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV
and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw
> 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour,
are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017
+/- 0.030, where the first uncertainties are statistical, and the second
include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables,
revised author list, matches European Journal of Physics C versio
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