24 research outputs found
Low-field magnetoresistance in GaAs 2D holes
We report low-field magnetotransport data in two-dimensional hole systems in
GaAs/AlGaAs heterostructures and quantum wells, in a large density range, cm, with primary focus on
samples grown on (311)A GaAs substrates. At high densities, cm, we observe a remarkably strong positive magnetoresistance.
It appears in samples with an anisotropic in-plane mobility and predominantly
along the low-mobility direction, and is strongly dependent on the
perpendicular electric field and the resulting spin-orbit interaction induced
spin-subband population difference. A careful examination of the data reveals
that the magnetoresistance must result from a combination of factors including
the presence of two spin-subbands, a corrugated quantum well interface which
leads to the mobility anisotropy, and possibly weak anti-localization. None of
these factors can alone account for the observed positive magnetoresistance. We
also present the evolution of the data with density: the magnitude of the
positive magnetoresistance decreases with decreasing density until, at the
lowest density studied ( cm), it vanishes and is
replaced by a weak negative magnetoresistance.Comment: 8 pages, 8 figure
411 Surgical sperm retrieval in Non-Obstructive Azoospermia(NOA) - How do we predict success?
Magnetoresistance studies and optimization of deposition parameters of pulsed electron deposited La
We document the magnetotransport properties of multicomponent La0.6Pb0.4Mn0.8Ru0.2O3 oxide thin films deposited using Pulsed Electron Deposition. This is a model composition in this series, which shows adequate hole transport aided by the presence of both Mn4+ and Ru5+ ions with similar t2gand eg parentage. The optimized metal to insulator transition temperature (Tmi
Synthesis, characterization, and electrochemical cycling behavior of the Ru-doped spinel, Li[Mn2-xRux]O4 (x=0, 0.1, and 0.25)
10.1149/1.3139013Journal of the Electrochemical Society1568A652-A660JESO
Magnetoresistance studies and optimization of deposition parameters of pulsed electron deposited La 0.6
X-ray absorption spectra at the Ru and Mn L2,3 edges and long-range ferromagnetism in SrRu1-xMnxO3 solid solutions (0<x<0.5)
Trends in incidence of Ewing sarcoma of bone in India – Evidence from the National Cancer Registry Programme (1982–2011)
Background: Ewing sarcoma is a malignant tumour found mainly in childhood and adolescence. The present study aims at analyzing the data on Ewing sarcoma cases of bone from the National Cancer Registry Programme, India to provide incidence, patterns, and trends in the Indian population. Materials and Methods: The data of five Population Based Cancer Registries (PBCR) of Bangalore, Mumbai, Chennai, Bhopal and Delhi over 30 years period (1982– 2011) were used to calculate the Age Specific and Age Standardized Incidence Rates (ASpR and ASIR), and trends in incidence was analyzed by linear and Joinpoint Regression. Results: Ewing sarcoma comprised around 15 % of all bone malignancies. Sixty-eight percent were 0–19 years, with 1.6 times risk of tumour in bones of limbs as compared to other bones. The highest incidence rate (per million) was in the 10–14 years age group (male −4.4, female −2.9) with significantly increasing trend in ASpR observed in both sexes. Pooled ASIR per million for all ages was higher in male (1.6) than female (1.0) with an increasing rate ratio of ASIR with increase in age. Trend of pooled ASIR for all ages was significantly increased in both sexes. Twelve percent cases were reported in ≥30 years of age. Conclusion: This paper has described population based measurements on burden and trends in incidence of skeletal Ewing in India. These may steer further research questions on the clinical and molecular epidemiology to explain factors associated with the increasing incidence of Ewing sarcoma bone observed in India. Keywords: Ewing sarcoma, Bone, Incidence, Cancer Registry, Indi