1,153 research outputs found
Electrostatic tuning of magnetism at the conducting (111) (LaSr)(AlTa)/SrTiO interface
We present measurements of the low temperature electrical transport
properties of the two dimensional carrier gas that forms at the interface of
(LaSr)(AlTa)/SrTiO (LSAT/STO) as
a function of applied back gate voltage, . As is found in (111)
LaAlO/SrTiO interfaces, the low-field Hall coefficient is
electron-like, but shows a sharp reduction in magnitude below 20 V,
indicating the presence of hole-like carriers in the system. This same value of
correlates approximately with the gate voltage below which the
magnetoresistance evolves from nonhysteretic to hysteretic behavior at
millikelvin temperatures, signaling the onset of magnetic order in the system.
We believe our results can provide insight into the mechanism of magnetism in
SrTiO based systems.Comment: 5 pages, 3 figure
Numerical and experimental investigation of FBG strain response at cryogenic temperatures
Strain response of FBG sensors are investigated at various temperatures from 298 K to 4.2 K. Numerical modelling is carried out for acrylate coated, substrate-free fiber Bragg grating (FBG) sensors at room temperature of 298 K and cryogenic temperatures of 77 K, 10 K and 4.2 K. A 1550 nm Bragg wavelength (λB) FBG sensor is modelled and simulated for applied strain (ε) ranging from 0 to 800 µm/m. The Bragg wavelength shifts (ΔλB) thus obtained are compared with the experimentally investigated values obtained by subjecting the FBG sensor to axial strain, with its sensing part not being bonded to any surface. The MTS25 tensile machine with a cryostat under vacuum conditions (10-4 mbar pressure) is used for the experiments and the required temperatures are maintained using liquid Nitrogen (LN2) and compressed Helium gas (He). The Bragg wavelength shift (ΔλB) versus induced strain (ε) is regressed with a linear polynomial function and the strain sensitivity obtained in both the cases are discussed
Stranding of a whale shark, Rhincodon typus (Smith) at Pamban, Gulf of Mannar
The stranding of whale sharks in shallow waters
along the Indian coast is not uncommon. Whale
shark is listed as an endangered species as per the
IUCN Red List (2000)
Mass mortality of triggerfish Odonus niger (Rupell) along Dhanuskodi coast
On 3rd and 4th October 2007, several fishes of
the species Odonus niger (locally known as
Karuppu Klaathi ) were washed ashore along the
coast for a stretch of nearly 4 km from Dhanuskodi
check post to Arichumunai. On an average, 60 fishes
were found lying in every 15 m of the stretch
Bioluminescence assay of adenosine triphosphate in drug susceptibility testing of Mycobacterium tuberculosis
Twenty three clinical isolates of M. tuberculosis and the reference strain, M. tuberculosis H37Rv were
tested for their susceptibility to trifluoperazine (TFP) by the standard broth dilution method and the
bioluminescence assay. The results showed that in 15 of the 23 isolates, the minimal inhibitory
concentration (MIC) was identical in both the methods and in the remaining 8 isolates the difference
in the MIC values between the methods, was less than two fold and was not significant. The findings
suggest that the measurement of adenosine triphosphate (ATP) by bioluminescence assay can be
employed as an alternative method for the rapid screening of clinical isolates for their susceptibility
to anti-mycobacterial agents
Investigation of laser ablated ZnO thin films grown with Zn metal target: a structural study
High quality ZnO thin films were gown using the pulsed laser deposition
technique on (0001) AlO substrates in an oxidizing atmosphere, using a
Zn metallic target. We varied the growth conditions such as the deposition
temperature and the oxygen pressure. First, using a battery of techniques such
as x-rays diffraction, Rutherford Backscattering spectroscopy and atomic force
microscopy, we evaluated the structural quality, the stress and the degree of
epitaxy of the films. Second, the relations between the deposition conditions
and the structural properties, that are directly related to the nature of the
thin films, are discussed qualitatively. Finally, a number of issues on how to
get good-quality ZnO films are addressed.Comment: To be published in Jour. Appl. Phys. (15 August 2004
समुद्री संवर्धन प्रणाली से उच्च मूल्य खाघ शुक्ति पर एक मूल्य श्रृंखला
A value chain on High value edible oyster from Mariculture system
Structural and magnetic properties of a series of low doped ZnCoO thin films deposited from Zn and Co metal targets on (0001) AlO substrates
We report on the synthesis of low doping ZnCoO () thin
films on (0001)-AlO substrates. The films were prepared in an oxidizing
atmosphere, using the pulsed laser deposition technique starting from Zn and Co
metallic targets. We first studied the influence of the strains of ZnO and
their stuctural properties. Second, we have investigated the structural and the
magnetic properties of the ZnCoO films. We show that at low doping,
the lattice parameters and the magnetization of the ZnCoO films
depend strongly on the Co concentration.Comment: to be published in Journal Applied Physics (June 2004) as a
proceeding of the MMM/Intermag Conferenc
A Study on pulmonary tuberculosis in the adult population social, clinical, radiological presentation of smear-positive tuberculosis
On a humpback dolphin, washed ashore at Seeniappa Durgah, Gulf of Mannar
A dead dolphin was washed ashore at Seeniappa
Durgah along the Gulf of Mannar coast on
22-10-2007
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