5,026 research outputs found
Anisotropic superconducting properties of aligned SmLaFeAsOF microcrystalline powder
The SmLaFeAsOF compound is a quasi-2D
layered superconductor with a superconducting transition temperature T = 52
K. Due to the Fe spin-orbital related anisotropic exchange coupling
(antiferromagnetic or ferromagnetic fluctuation), the tetragonal
microcrystalline powder can be aligned at room temperature using the
field-rotation method where the tetragonal -plane is parallel to the
aligned magnetic field B and -axis along the rotation axis.
Anisotropic superconducting properties with anisotropic diamagnetic ratio
2.4 + 0.6 was observed from low field susceptibility
(T) and magnetization M(B). The anisotropic low-field phase diagram
with the variation of lower critical field gives a zero-temperature penetration
depth (0) = 280 nm and (0) = 120 nm. The magnetic
fluctuation used for powder alignment at 300 K may be related with the pairing
mechanism of superconductivity at lower temperature.Comment: 4 pages, 6 figure
Coercive Field and Magnetization Deficit in Ga(1-x)Mn(x)As Epilayers
We have studied the field dependence of the magnetization in epilayers of the
diluted magnetic semiconductor Ga(1-x)Mn(x)As for 0.0135 < x < 0.083.
Measurements of the low temperature magnetization in fields up to 3 T show a
significant deficit in the total moment below that expected for full saturation
of all the Mn spins. These results suggest that the spin state of the
non-ferromagnetic Mn spins is energetically well separated from the
ferromagnetism of the bulk of the spins. We have also studied the coercive
field (Hc) as a function of temperature and Mn concentration, finding that Hc
decreases with increasing Mn concentration as predicted theoretically.Comment: 15 total pages -- 5 text, 1 table, 4 figues. Accepted for publication
in MMM 2002 conference proceedings (APL
POST COVID PNEUMONIA: MODERN THERAPEUTIC APPROACH BY PULMONARY DRUG DELIVERY DEVICE
Streptococcus pneumonia (also known as pneumococcal) is a commensal that colonizes the upper respiratory tract and a pathogen that causes intrusive illnesses like otitis media, pneumonia, sepsis, and meningitis. In India, the Invasive Bacterial Infection Surveillance (IBIS) organization and South Asian Pneumococcal Alliance (SAPNA) have been associated with assortment of significant information in regards to serotype dissemination and antimicrobial obstruction of pneumococcal diseases for over 12 years. COVID 19 Patients are much more prone towards this infection, if untreated at appropriate time. So development of New Device are immense Important which contributes rapid and Proper Drug Delivery to lungs. Research must be carried out in the field of Novel Drug Delivery System for target delivery of Drugs like Antibiotic, Bronchodiator and Corticosteroid to Respiratory Tract. The present Review article focus Different grade of Pneumococcal Infection and Infection associated with Post COVID Condition. The article also highlights new devices which helpful for Pulmonary drug delivery which is vital during COVID Associated Pneumococcal Infection
An Optimized Deep Learning Based Optimization Algorithm for the Detection of Colon Cancer Using Deep Recurrent Neural Networks
Colon cancer is the second leading dreadful disease-causing death. The challenge in the colon cancer detection is the accurate identification of the lesion at the early stage such that mortality and morbidity can be reduced. In this work, a colon cancer classification method is identified out using Dragonfly-based water wave optimization (DWWO) based deep recurrent neural network. Initially, the input cancer images subjected to carry a pre-processing, in which outer artifacts are removed. The pre-processed image is forwarded for segmentation then the images are converted into segments using Generative adversarial networks (GAN). The obtained segments are forwarded for attribute selection module, where the statistical features like mean, variance, kurtosis, entropy, and textual features, like LOOP features are effectively extracted. Finally, the colon cancer classification is solved by using the deep RNN, which is trained by the proposed Dragonfly-based water wave optimization algorithm. The proposed DWWO algorithm is developed by integrating the Dragonfly algorithm and water wave optimization
Capping-induced suppression of annealing in Ga(1-x)Mn(x)As epilayers
We have studied the effects of capping ferromagnetic Ga(1-x)Mn(x)As epilayers
with a thin layer of undoped GaAs, and we find that even a few monolayers of
GaAs have a significant effect on the ferromagnetic properties. In particular,
the presence of a capping layer only 10 monolayers thick completely suppresses
the enhancement of the ferromagnetism associated with low temperature
annealing. This result, which demonstrates that the surface of a Ga(1-x)Mn(x)As
epilayer strongly affects the defect structure, has important implications for
the incorporation of Ga(1-x)Mn(x)As into device heterostructures.Comment: 13 pages with figures attatche
Effects of NH3 pre-treatment time on nitrogen-polar GaN grown on carbon-face 4H-SiC using high-temperature metal-organic chemical vapor deposition
Electron-hole and plasmon excitations in 3d transition metals: Ab initio calculations and inelastic x-ray scattering measurements
We report extensive all-electron time-dependent density-functional
calculations and nonresonant inelastic x-ray scattering measurements of the
dynamical structure factor of 3d transition metals. For small wave vectors, a
plasmon peak is observed which is well described by our calculations. At large
wave vectors, both theory and experiment exhibit characteristic low-energy
electron-hole excitations of d character which correlate with the presence of d
bands below and above the Fermi level. Our calculations, which have been
carried out in the random-phase and adiabatic local-density approximations, are
found to be in remarkable agreement with the measured dynamical structure
factor of Sc and Cr at energies below the semicore onset energy (M-edge) of
these materials.Comment: To appear in Phys. Rev.
Exchange Biasing of the Ferromagnetic Semiconductor Ga1-xMnxAs
We demonstrate the exchange coupling of a ferromagnetic semiconductor
(Ga1-xMnxAs) with an overgrown antiferromagnet (MnO). Unlike most conventional
exchange biased systems, the blocking temperature of the antiferromagnet (T_B =
48 +- 2 K) and the Curie temperature of the ferromagnet (T_C = 55.1 +- 0.2 K)
are comparable. The resulting exchange bias manifests itself as a clear shift
in the magnetization hysteresis loop when the bilayer is cooled in the presence
of an applied magnetic field and an enhancement of the coercive field.Comment: pdf file only; submitted to Applied Physics Letter
- …