18 research outputs found
Fabrication of PbS quantum dots and their applications in solar cells based on ZnO nanorod arrays
No full textPrediction of Ground Water Level using SVM-WOA Approach: A Case Study
No full text269-277Reliable and accurate estimation of Groundwater Level (GWL) fluctuations is essential and vital for sustainable water
resources management. Due to uncertainties and interdependencies in hydro-geological processes, GWL prediction is
complex by the fact that fluctuation of GWL is extremely nonlinear and non-stationary. Utilising novel methods for
accurately predicting GWL is of vital significance in arid regions. In present work, Support Vector Machine (SVM), in
combination with Whale Optimisation Algorithm (SVM-WOA), is applied to forecast GWL in Bhubaneswar region (Odisha
University of Agricultural Technology). Three quantitative statistical performance assessment indices, coefficient of
determination (R2), Mean Squared Error (MSE), and Wilmott Index (WI), is used to assess model performances. Based on
the assessment with conventional SVM and RBFN models, the performance of hybrid SVM-WOA model is preeminent.
SVM-WOA is capable of predicting nonlinear behavior of GWLs. Proposed modelling technique can be applied in different
regions for proper management of groundwater resources and provides significant information, at a short time scale, to
estimate variability in groundwater at local level
Magneto-optical properties of CoFeB ultrathin films: Effect of Ta buffer and capping layer
No full textGrowth and dynamic magnetization study of Co2MnAl full Heusler alloy thin films
No full textStructural and dynamic magnetization properties of Co2MnAl (CMA) full Heusler alloy thin films grown on Si (100) substrates at different substrate temperatures (T-s) room temperature (RT), 200 degrees C, 300 degrees C, 400 degrees C and 500 degrees C are investigated. X-ray diffraction patterns revealed the formation of B2 ordered phase. Ferromagnetic Resonance (FMR) technique have been used to investigate the dynamic magnetization response. From the observed frequency dependence of the resonance field (H-r) and line width (Delta H), the effective saturation magnetization (4 pi M-eff) and damping constant () have been evaluated. The lowest damping constant was found to be 0.007 +/- 0.002 for the film grown at T-s=200 degrees C which is comparable to the reported value.</p
Effect of post-annealing on the magnetic properties of sputtered Mn56Al44 thin films
No full textMa(56)Al(44) (MnAl) thin films of constant thickness (similar to 30nm) were grown on naturally oxidized Si substrates using DC-magnetron sputtering. Effect of deposition parameters such as sputtering power, substrate temperature (T-s), and post-annealing temperature have been systematically invstigated. X-ray diffraction patterns revealed the presence of mixed phases, namely the tau- and beta-MnAl. The highest saturation magnetization (M.$) was found to be 65emu/cc using PPMSVSM in film grown at T-s =500 degrees C. The magnetic ordering was found to get significantly improved by performing post annealing of these as-grwon at 400 degrees C for 1 hr in the presence of out-of-plane magnetic field of similar to 15000e in vacuum. In particular, at room temperature (RT), the Ms got enhanced after magnetic annealing from 65mm/cc to 500 emu/cc in MnAl films grown at T-s=500 degrees C. This sample exhibited a magneto-resistance of similar to 1.5% at RT. The tuning of the structural and magnetic properties of MnAl binary alloy thin films as established here by varying the growth parameters is critical with regards to the prospective applications of MnAI, a metastable ferromagnetic system which possesses the highest perpendicular magnetic anisotropy at RT till date.</p
Tunneling Magneto-resistance in grain boundary tailored Fe3O4 nano structured thin films
No full textRamanujan-style congruences for prime level
Get PDFWe establish Ramanujan-style congruences modulo certain primes between
an Eisenstein series of weight , prime level and a cuspidal newform in
the -eigenspace of the Atkin-Lehner operator inside the space of
cusp forms of weight for . Under a mild assumption, this
refines a result of Gaba-Popa. We use these congruences and recent work of
Ciolan, Languasco and the third author on Euler-Kronecker constants, to
quantify the non-divisibility of the Fourier coefficients involved by
The degree of the number field generated by these coefficients we investigate
using recent results on prime factors of shifted prime numbers.Comment: The final version, published in Mathematische Zeitschrifte
Composite Polymeric Magnetic Nanoparticles for Co-Delivery of Hydrophobic and Hydrophilic Anticancer Drugs and MRI Imaging for Cancer Therapy
No full textExercising complementary roles of polymer-coated magnetic nanoparticles for precise drug delivery and image contrast agents has attracted significant attention in biomedical applications. The objective of this study was to prepare and characterize magnetic nanoparticles embedded in polylactide-co-glycolide matrixes (PLGA-MNPs) as a dual drug delivery and imaging system capable of encapsulating both hydrophilic and hydrophobic drugs. PLGA-MNPs were capable of encapsulating both hydrophobic and hydrophilic drugs in a 2:1 ratio. Biocompatibility, cellular uptake, cytotoxicity, membrane potential, and apoptosis were carried out in two different cancer cell lines (MCF-7 and PANC-1). The molecular basis of induction of apoptosis was validated by Western blotting analysis. For targeted delivery of drugs, targeting ligand such as Herceptin was used, and such a conjugated system demonstrated enhanced cellular uptake and an augmented synergistic effect in an in vitro system when compared with native drugs. Magnetic resonance imaging was carried out both in vitro and in vivo to assess the efficacy of PLGA-MNPs as contrast agents. PLGA-MNPs showed a better contrast effect than commercial contrast agents due to higher T relaxivity with a blood circulation half-life ∼ 47 min in the rat model. Thus, our results demonstrated the dual usable purpose of formulated PLGA-MNPs toward either, in therapeutics by delivering different hydrophobic or hydrophilic drugs individually or in combination and imaging for cancer therapeutics in the near future
Static and dynamic properties of Co2FeAl thin films: Effect of MgO and Ta as capping layers
No full textThe influence of MgO and Ta capping layers on the static and dynamic magnetic properties of Co2FeAl (CFA) Heusler alloy thin films has been investigated. It is observed that the CFA film deposited with MgO capping layer is preeminent compared to the uncapped or Ta capped CFA film. In particular, the magnetic inhomogeneity contribution to the ferromagnetic resonance line broadening and damping constant are found to be minimal for the MgO capped CFA thin film i.e., 0.12±0.01 Oe and 0.0074±0.00014, respectively. The saturationmagnetization was found to be 960±25emu/cc.</p
Composite Polymeric Magnetic Nanoparticles for Co-Delivery of Hydrophobic and Hydrophilic Anticancer Drugs and MRI Imaging for Cancer Therapy
No full textExercising complementary roles of polymer-coated magnetic nanoparticles
for precise drug delivery and image contrast agents has attracted
significant attention in biomedical applications. The objective of
this study was to prepare and characterize magnetic nanoparticles
embedded in polylactide-co-glycolide matrixes (PLGA-MNPs) as a dual
drug delivery and imaging system capable of encapsulating both hydrophilic
and hydrophobic drugs. PLGA-MNPs were capable of encapsulating both
hydrophobic and hydrophilic drugs in a 2:1 ratio. Biocompatibility,
cellular uptake, cytotoxicity, membrane potential, and apoptosis were
carried out in two different cancer cell lines (MCF-7 and PANC-1).
The molecular basis of induction of apoptosis was validated by Western
blotting analysis. For targeted delivery of drugs, targeting ligand
such as Herceptin was used, and such a conjugated system demonstrated
enhanced cellular uptake and an augmented synergistic effect in an in vitro system when compared with native drugs. Magnetic
resonance imaging was carried out both in vitro and in vivo to assess the efficacy of PLGA-MNPs as contrast
agents. PLGA-MNPs showed a better contrast effect than commercial
contrast agents due to higher T2 relaxivity with a blood
circulation half-life ∼ 47 min in the rat model. Thus, our
results demonstrated the dual usable purpose of formulated PLGA-MNPs
toward either, in therapeutics by delivering different hydrophobic
or hydrophilic drugs individually or in combination and imaging for
cancer therapeutics in the near future
