[en] The template synthesis of copper(II) and nickel(II) complexes derived from 2,6-diformyl-4-methylphenol with diethylenetriamine or 1,2-bis(3-amino propylamino)ethane produce the 12-membered N₃O and 17-membered N₄O macrocyclic complexes, respectively. The geometry of the complexes has been determined with the help of electronic and EPR spectroscopic values and found to be five coordinated square pyramidal and, six coordinated distorted tetragonal for 12-membered and 17-membered macrocyclic complexes, respectively. Electrochemical studies of the mononuclear N₃O and N₄O copper(II) complexes show one irreversible one electron reduction wave at E^pc = .1.35 and .1.15 V respectively, and the corresponding nickel(II) complexes show irreversible one-electron reduction wave at E^pc = .1.25 and .1.22 V, respectively. The nickel(II) complexes show irreversible one-electron oxidation wave at Epa = +0.84 and +0.82 V, respectively. All the complexes were evaluated for in vitro antimicrobial activity against the human pathogenic bacteria and fungi

[en] Realizing different physical properties in one material is a very interesting approach to create novel materials of rich functionality. Ln₂O₃ rare-earth sesquioxides are a group of compounds exhibit interesting magnetic, optical and electronic properties. In the present work, iron (Fe) substituted dysprosium oxide system Dy_1-xFe_xO₃ (where x = 0 to 0.2) were prepared by solid state reaction technique by subsequent heating from 900 to 1300℃. Phase identification of the prepared compounds were carried out by powder X-ray diffraction analysis using Bruker D2 PHASER diffractometer. Crystal structures of the prepared compounds were analyzed using POWDERX indexing software and it was found that there is variation in the crystal system from parent (Dy₂O₃) cubic to tetragonal in the iron substituted compounds. The occurrence of tetragonality in the Fe substituted compounds may be attributed to the variation in the occupancy position of Fe in Dy₂O₃ system. The effect of Fe substitution in surface morphology and elemental composition of the compounds was analyzed with scanning electron microscopy and Energy dispersive X-ray analysis respectively. Diffused reflectance studies show a red shift in energy gap while increasing the concentration of Fe in Dy₂O₃ system. The magnetic behaviour of the prepared compounds was studied using Vibrating Sample magnetometer and the results reveal the increase in magnetic moment on increasing the substitution level of Fe in the Dy₂O₃ system. (author)

[en] α-Naphthylisocyanation reactions are first conducted on Schiff base chelates of lanthanide(III) ion. The results of reaction reactivity clearly indicate that α-naphthylisocyanate attacks at the coordinated Schiff base chelates and after prototropic rearrangement forms α- naphthylamido derivatives. The results are investigated and based on spectroscopic results. The structures of the chelates are proposed. (author)

[en] The objective of this study is to evaluate the dose delivery accuracy of two beam matched linear accelerators and ensure their compliance through TPS dose verifications, 2D planar dose distribution and various beam matching parameters. TPS dose verifications and 2D planar dose distribution verifications among two LINACs were analysed along with beam matching parameters and the results were within acceptable criteria. Therefore, it is possible to interchange accelerators for ongoing irradiated patients without re-planning

[en] Ventricular Tachycardia (VT) refers to a type of abnormal heart rhythm that originates from ventricles and is difficult to manage or control with standard treatments, such as medications or repeated catheter ablation. Cardiac Stereotactic body radiation therapy (SBRT) is a novel technique with capability of delivering high doses of radiation to the target with sub-millimeter accuracy for the treatment of refractory VT patients. This has demonstrated decrease in arrhythmia episodes with favourable short term safety profile. This study discuss the feasibility of cardiac SBRT as a treatment option with our initial experience. Non-Invasive cardiac radioablation has proven to be a valid new therapeutic options for the refractory VT patients. In the modern treatment era, with the help of advanced imaging modalities, treatment modalities and sophisticated software along with high definition cardiac imaging, Cardiac SBRT can be considered as a front line alternative therapy for refractory VT patients

[en] The nonlinear optical properties of 2-Nitroaniline, which is known to be a superior nonlinear optical material, have been investigated. The optical properties, such as absorption coefficients, are analyzed with UV visible spectroscopy analyses. The third-order nonlinear optical properties of the sample are analyzed with Z-scan, Eclipse Z-scan and f -scan techniques. The nonlinear absorption coefficient, nonlinear refractive index and third-order susceptibility are examined using open aperture and closed aperture Z-scan methods. The nanoscale sensitive variations in the nonlinear optical properties are observed with the Eclipse Z-scan method. The third-order optical nonlinearities occurring in the nanoscale range are also analyzed using the f -scan method and compared with the results obtained from the Z-scan measurement. The optical limiting characteristics of the sample have also been examined for its low-power optical limiting applications. (paper)

[en] Purpose: To validate the Monaco montecorlo beam model for a range of small field in the heterogeneous medium. Methods: A in-house phantom with three different medium of Foam, PMMA and derlin resembling the densities of lung, soft tissue, and bone was used for the study. The field sizes of 8, 16, 24, 32 and 48mm were studied for the validation of montecarlo algorithm using 0.01cc volume ionchamber and gafchromic films. The 6MV photon beam from Elekta Beam modulator was used with 100cm SAD setup. The outputs were measured at the depth of 5, 10 and 20mm in every second medium with 3cm buildup of first medium for the interface of lung-bone, lung-soft tissue, soft tissue-bone, bone-lung and soft tissue-lung. Similarly, the 2D dose analysis with gamma criteria of 2%2mm were done at the same depths using gafchromic film. For all the measurements 10.4×10.4cm were taken as reference to which the other field sizes were compared. Monaco TPSv.3.20 was used to calculate the dose distribution for all the simulated measurement setups. Results: The average maximum difference among the field sizes of 8, 16, 24, 32 and 48mm at the depth of 5mm in second medium with the interface of lung-bone, lung-soft tissue, soft tissue-bone, bone-lung and soft tissue-lung were observed as 1.29±0.14%, 0.49±0.16%, 0.87±0.23%, 0.92±0.11%, 1.01±0.19% respectively. The minimum and maximum variation of dose among different materials for the smallest field size of 8mm were observed as 0.23% and 1.67% respectively. The 2D analysis showed the average gamma passing of 98.9±0.5%. The calculated two-tailed P-value were showed insignificance with values of 0.562 and 0.452 for both ionchamber and film measurements. Conclusion: The accuracy of dose calculation for the small fields in Monaco Montecarlo TPS algorithm was validated in different inhomogeneous medium and found the results were well correlated with measurement data.

[en] We focus on the application of powder diffraction data to get abinitio crystal structure determination of thiophene derived 1,4 DHP prepared by cyclocondensation method using solid catalyst. Crystal structure of the compound has been solved by direct-space approach on Monte Carlo search in parallel tempering mode using FOX program. Initial atomic coordinates were derived using Gaussian 09W quantum chemistry software in semi-empirical approach and Rietveld refinement was carried out using GSAS program. The crystal structure of the compound is stabilized by one N-H…O and three C-H…O hydrogen bonds. PIXEL lattice energy calculation was carried out to understand the physical nature of intermolecular interactions in the crystal packing, on which the total lattice energy is contributed into Columbic, polarization, dispersion, and repulsion energies.

[en] The search for thermoelectric materials has been incredibly increased due to the increase in global energy demand. Hence the present work focus on preparation and characterization of thermal transport phenomena of pure and Ba/Ca substituted perovskite LaFeO₃ orthoferrite system. The conventional solid state reaction technique is utilized for the preparation of LaFeO₃ and La_0.9M_0.1FeO₃ (M = Ca and Ba) compounds. Crystal structure analyses of the prepared samples are analyses using Rietveld refinement process which confirms the orthoferrite crystal structure of all the prepared compounds with induced distortion in position of atoms by the incorporation of substituent atoms. The electronic structure calculations are performed by VASP. As the LaFeO₃ compound is a strongly energy correlated system, the Density Functional Theory (DFT) calculations are performed by DFT + U (Hubbard function) method. The computed band gap values are compared with the energy gap values calculated from UV–Vis spectral analysis. Electrical conductivity measurement and Arrhenius behavior for the temperature range of room temperature to 650 K are analyzed and the drift increase in conductivity with respect to temperature is due to the thermally activated mobility of charge carriers. Temperature dependent thermopower analysis is also examined using homemade seebeck coefficient measurement system. The calculation of thermoelectric power factor reveals that the Ba substituted LaFeO₃ compound show highest power factor value of 3.73 μW/K² cm at higher temperature and the superior power factor values observed in the Ba substituted compound determine the material's capability in power generating devices based on thermoelectric effect.

[en] Purpose: To evaluate the angular dependence correction for Matrix Evolution 2D array detector in quality assurance of volumetric modulated arc therapy(VMAT). Methods: Total ten patients comprising of different sites were planned for VMAT and taken for the study. Each plan was exposed on Matrix Evolution 2D array detector with Omnipro IMRT software based on the following three different methods using 6MV photon beams from Elekta Synergy linear accelerator. First method, VMAT plan was delivered on Matrix Evolution detector as it gantry mounted with dedicated holder with build-up of 2.3cm. Second, the VMAT plan was delivered with the static gantry angle on to the table mounted setup. Third, the VMAT plan was delivered with actual gantry angle on Matrix Evolution detector fixed in Multicube phantom with gantry angle sensor and angular dependence correction were applied to quantify the plan quality. For all these methods, the corresponding QA plans were generated in TPS and the dose verification was done for both point and 2D fluence analysis with pass criteria of 3% dose difference and 3mm distance to agreement. Results: The measured point dose variation for the first method was observed as 1.58±0.6% of mean and SD with TPS calculated. For second and third method, the mean and standard deviation(SD) was observed as 1.67±0.7% and 1.85±0.8% respectively. The 2D fluence analysis of measured and TPS calculated has the mean and SD of 97.9±1.1%, 97.88±1.2% and 97.55±1.3% for first, second and third methods respectively. The calculated two-tailed Pvalue for point dose and 2D fluence analysis shows the insignificance with values of 0.9316 and 0.9015 respectively, among the different methods of QA. Conclusion: The qualitative evaluation of angular dependence correction for Matrix Evolution 2D array detector shows its competency in accuracy of quality assurance measurement of composite dose distribution of volumetric modulated arc therapy