38,920 research outputs found
Feshbach resonances in ultracold 85Rb-87Rb and 6Li-87Rb mixtures
We present an analysis of experimentally accessible magnetic Feshbach
resonances in ultra-cold hetero-nuclear 85Rb-87Rb and 6Li-87Rb mixtures. Using
recent experimental measurements of the triplet scattering lengths for 6Li-87Rb
and 7Li-87Rb mixtures and Feshbach resonances for one combination of atomic
states, we create model potential curves and fine tune them to reproduce the
measured resonances and to predict the location of several experimentally
relevant resonances in Li-Rb collisions. To model 85Rb-87Rb collisions, we use
accurate Rb_2 potentials obtained previously from the analysis of experiments
on 87Rb-87Rb collisions. We find resonances that occur at very low magnetic
fields, below 10 G, which may be useful for entanglement generation in optical
lattices or atom chip magnetic traps.Comment: 8 pages, 5 figure
Functional outcome of anterior cruciate ligament reconstruction using bone-patellar tendon-bone graft: a descriptive observational study from Telangana
Background: The knee joint is the most commonly injured of all joints and the anterior cruciate ligament is the most commonly injured ligament. The bone-patellar tendon-bone (BPTB) autograft is the most commonly used autograft for reconstruction. The bone-patellar tendon-bone autograft has been widely accepted as the gold standard for ACL reconstruction with a high success rate. Objectives of the study were to study the functional outcome of ACL reconstruction using BPTB graft.Methods: The present descriptive observational study was carried out at department of orthopedics, Mediciti institute of medical sciences, Hyderabad involving 30 patients of ACL tear by simple random sampling method. Patients were then evaluated by both subjectively and objectively. They were evaluated by using Lysholm and Gilquist knee scoring scale. Data was analyzed by using SPSS 24.0 version IBM USA.Results: Majority of the patients i.e., 13 (43.3%) were from 26-35 years age group with right sided involvement in 60%. The result was found to be good in 16 i.e., 53.3%, excellent in 10 i.e., 33.3% and fair in 4 i.e., 13.3% patients. Prevalence of complications was reported as 23.3% in our study.Conclusions: Our study of ACL repair using BPTP gives good to excellent results within a span of one year
Constraints on millicharged particles with low threshold germanium detectors at Kuo-Sheng Reactor Neutrino Laboratory
Relativistic millicharged particles () have been proposed in various
extensions to the Standard Model of particle physics. We consider the scenarios
where they are produced at nuclear reactor core and via interactions of
cosmic-rays with the earth's atmosphere. Millicharged particles could also be
candidates for dark matter, and become relativistic through acceleration by
supernova explosion shock waves. The atomic ionization cross section of
with matter are derived with the equivalent photon approximation.
Smoking-gun signatures with significant enhancement in the differential cross
section are identified. New limits on the mass and charge of are
derived, using data taken with a point-contact germanium detector with 500g
mass functioning at an energy threshold of 300~eV at the Kuo-Sheng Reactor
Neutrino Laboratory.Comment: 8 pages, 7 figure
Chandra High Resolution X-ray Spectroscopy of AM Her
We present the results of high resolution spectroscopy of the prototype polar
AM Herculis observed with Chandra High Energy Transmission Grating. The X-ray
spectrum contains hydrogen-like and helium-like lines of Fe, S, Si, Mg, Ne and
O with several Fe L-shell emission lines. The forbidden lines in the spectrum
are generally weak whereas the hydrogen-like lines are stronger suggesting that
emission from a multi-temperature, collisionally ionized plasma dominates. The
helium-like line flux ratios yield a plasma temperature of 2 MK and a plasma
density 1 - 9 x10^12 cm^-3, whereas the line flux ratio of Fe XXVI to Fe XXV
gives an ionization temperature of 12.4 +1.1 -1.4 keV. We present the
differential emission measure distribution of AM Her whose shape is consistent
with the volume emission measure obtained by multi-temperature APEC model. The
multi-temperature plasma model fit to the average X-ray spectrum indicates the
mass of the white dwarf to be ~1.15 M_sun. From phase resolved spectroscopy, we
find the line centers of Mg XII, S XVI, resonance line of Fe XXV, and Fe XXVI
emission modulated by a few hundred to 1000 km/s from the theoretically
expected values indicating bulk motion of ionized matter in the accretion
column of AM Her. The observed velocities of Fe XXVI ions are close to the
expected shock velocity for a 0.6 M_sun white dwarf. The observed velocity
modulation is consistent with that expected from a single pole accreting binary
system.Comment: 6 figures, AASTEX style, accepted for publication in Ap
Assessment of insecticides and Cry2AB toxin resistance development in Karnataka population of Plutella xylostella (Linn.)
Insecticidal resistance studies against third instar larvae of DBM (Plutella xylostella L.) were carried out to know the rate of development of resistance from F1 to F3 generations in Karnataka population. The third instar larvae obtained from field were subjected to bioassay studies with tested against acephate, cypermethrin, spinosad, cartap hydrochloride and Cry2Ab toxin using leaf dip method to calculate LC50 values. The LC50 values of the insecticides were further used to quantify the resistance in P. xylostella of parental generation (F0) from Karnataka field population. The survivals from F0 generation were reared to next generation (F1). Resistance development studies was assessed from F1 to F3 generation with third instar larvae in every generation with a concentration that caused 80.00 % mortality for all the test insecticides and Cry2Ab toxin. Results revealed that ((0.17 folds) no resistance was developed against acephate in F3 generation. In case of cypermethrin 2.33 folds. Resistance studies further revealed that 1.50 folds resistance was developed against spinosad, 2.28 folds against cartap hydrochloride and Cry2Ab toxin 1.49 folds resistance was recorded in F3 generation. The rate of development of resistance from F1 to F3 generations increased in all the test insecticides and Cry toxin, except against acephate in Karnataka population. This data will be useful in the development of insecticide resistance management approach for DBM
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