SYNTHESIS OF ACTIVATED CARBONS FROM PUTRESCIBLE SOLID WASTE FOR TREATING TEXTILE DYE EFFLUENT

In the present study an attempt has been made to compare the adsorption efficiency of activated carbons (PVW and PFW) prepared from putrescible solid waste. Methylene blue dye (MB) was selected as the model compound. Activated carbons were characterized to find their adsorption capacity. Batch mode adsorption studies were conducted to evaluate the effect of various parameters. BET surface area was found to be 603.7 and 227.3 m2g-1 for PVW and PFW respectively. The adsorption followed pseudo second order kinetics for both the adsorbents. The isotherm data concluded that the adsorption of MB onto both the adsorbents is monolayer and chemisorption in nature. The adsorbents showed a maximum desorption of 40.2% for PVW and 70.1 % for PFW. Batch mode adsorption was carried out with textile dye effluent and the results confirmed that the activated carbons can be employed as effective adsorbents for improving their quality. Â

Electrical and Magnetic behaviour of PrFeAsO0.8F0.2 superconductor

The superconducting and ground state samples of PrFeAsO0.8F0.2 and PrFeAsO have been synthesised via easy and versatile single step solid state reaction route. X-ray & Reitveld refine parameters of the synthesised samples are in good agreement to the earlier reported value of the structure. The ground state of the pristine compound (PrFeAsO) exhibited a metallic like step in resistivity below 150K followed by another step at 12K. The former is associated with the spin density wave (SDW) like ordering of Fe spins and later to the anomalous magnetic ordering for Pr moments. Both the resistivity anomalies are absent in case of superconducting PrFeAsO0.8F0.2 sample. Detailed high field (up to 12Tesla) electrical and magnetization measurements are carried out for superconducting PrFeAsO0.8F0.2 sample. The PrFeAsO0.8F0.2 exhibited superconducting onset (Tconset) at around 47K with Tc({\rho} =0) at 38K. Though the Tconset remains nearly invariant, the Tc({\rho} =0) is decreased with applied field, and the same is around 23K under applied field of 12Tesla. The upper critical field (Hc2) is estimated from the Ginzburg Landau equation (GL) fitting, which is found to be ~ 182Tesla. Critical current density (Jc) being calculated from high field isothermal magnetization (MH) loops with the help of Beans critical state model, is found to be of the order of 103 A/cm2. Summarily, the superconductivity characterization of single step synthesised PrFeAsO0.8F0.2 superconductor is presented.Comment: 15 Pages Text + Fig

Structural, Magnetic and Magneto-caloric studies of Ni50Mn30Sn20Shape Memory Alloy

We have synthesized a nominal composition of Ni50Mn30Sn20 alloy using arc melting technique. Rietveld refinement confirms the austenite L21 structure in Fm-3m space group. Electrical resistivity has been found to clearly exhibiting two different phenomena viz. a magnetic transition from paramagnetic to ferromagnetic and a structural transition from austenite to martensitic phase. Thermo-magnetization measurements M(T) confirms ferromagnetic transition temperature TC at 222 K and martensitic transition starting at 127 K(MS). Magnetization measurement M(H) at 10 K confirms the ferromagnetic state. Frequency dependence of ac susceptibility \c{hi}' at low temperature suggests spin glass behavior in the system. The isothermal magnetic entropy change values have been found to be 1.14 J/Kg.K, 2.69 J/Kg.K and 3.9 J/Kg.K, with refrigeration capacities of 19.6 J/kg, 37.8 J/kg and 54.6 J/kg for the field change of 1, 2 and 3 Tesla respectively at 227 K.Comment: 16 pages text + Figs. Ni50Mn30Sn20 alloy: reasonable refrigeration capacity tunable to Room

Structural, elastic and magnetic properties of spinel Co3O4

We have investigated the structural and magnetic properties of Co3O4 ceramic synthesized by solid state reaction method. Powder X-ray diffraction (XRD), Raman spectroscopic and Fourier transforms infrared (FTIR) analysis reveals single phase formation at room temperature. Analysis of XRD data indicates that the Co3O4 crystallizes in cubic symmetry with face-centered cubic (fcc) Bravais lattice. Force constants and elastic properties have been estimated at room temperature using XRD and FTIR spectra and interpreted in terms of bond lengths. An octahedral broadening of the FTIR band (vo) and large force constant (ko) has been observed and indicated the inverse proportionality relationship between the force constant and the bond length. The elastic moduli and Poisson’s ratio uncorrected and corrected to zero porosity reveals the solidification of the Co3O4 ceramic sample. The field cooled (FC) and zero field cooled (ZFC) magnetization measurements using superconducting quantum interface device (SQUID) magnetometer exhibit a well-defined long-range antiferromagnetic order below transition (TN = 40 K) temperature

A prospective randomized control trial of topical tranexamic acid used in elderly patients with femoral neck fractures treated with hemiarthroplasty

Background: Geriatric hip fracture patients frequently suffer femoral neck injuries. The advantage of using TXA topically over the IV route is that maximum concentration of the drug is attained at the wound/surgical site with minimal systemic side effects of drug and also it is easy to administer locally. Aim of current study was fragmented necks of the femur can be treated with Tranexamic acid to reduce postoperative blood loss. Methods: Over the course of 20 months from June 2020 to December 2021, the orthopaedics department at SMS Hospital, Jaipur, conducted this study. A total of 174 patients (87 in each group) of age >60 years, presenting with neck of the femur in orthopaedics wards were enrolled in this study. Results: Compared to the control group, the case group experienced 408 ml more blood loss, which was treated with tranexamic acid. In cases and controls, transfusion was necessary for 31 and 41 patients, respectively. Conclusions: One dosage of topical tranexamic acid may be given to an older patient undergoing bipolar hemiarthroplasty for a fractured femoral neck in order to minimize post-operative blood loss

Superconductivity with high upper critical field in Ta-Hf Alloys

High upper-critical field superconducting alloys are required for superconducting device applications. In this study, we extensively characterized the structure and superconducting properties of alloys Ta$_{x}$ Hf$_{1-x}$ (x = 0.2, 0.4, 0.5, 0.6 and 0.8). The substitution of Hf (T$_{C}$ = 0.12 K, type-I superconductor) with Ta (T$_{C}$ = 4.4 K, type-I superconductor) shows an anomalous enhancement of T$_{C}$ with variation of composition. Interestingly, all compositions exhibited strongly coupled bulk type-II superconductivity with a high upper critical field. In particular, for compositions x = 0.2, and 0.4, the upper critical field (H$_{C2}$) approached the Pauli limiting field.Comment: 8 pages, 6 figure

Hikami-Larkin-Nagaoka (HLN) Fitting of Magneto Transport of Bi2Se3 Single Crystal in Different Magnetic Field Ranges

We report the detailed study of structural micro-structuraland high magnetic field magneto transport propertiesof Bi2Se3single crystal. Bi2Se3 single crystal is grown through conventional solid-state reaction route via the self-flux method. Rietveld analysis on Powder X-ray Diffraction showed that the studied Bi2Se3 crystal is crystallized in single-phase without any impurity. The surface morphology analyzed through Scanning Electron Microscopy study which shows that as-grown single crystal exhibit layered type structure and the quantitative weight of the atomic constituents (Bi and Se) are found to be closeto the stoichiometric amount in energy-dispersive X-ray spectroscopy analysis. Low temperature (2.5K) magneto-resistance (MR) exhibited a v-type cusp around origin at lower magnetic field, which is the sign of weak anti-localization effect. Further, Bi2Se3 single crystal magneto conductivity data is fitted by well-known HLN equation in different magnetic field range of 2Tesla, 4Tesla and 6Tesla and the resultant found that the conduction mechanism of Bi2Se3 is dominated by WAL state.Comment: 4 Pages Text + Fig

Prevalence and epidemiological aspect of dengue fever in western Rajasthan in year 2018

Background: Dengue fever (DF) is a common mosquito borne disease caused by dengue virus and is transmitted by Aedes mosquito. It is one of the major public health problems in India which affects all levels of society, but the burden of disease is a higher in poor people who live together in communities.  Aim of present study is aimed to assess the prevalence and epidemiological characteristics of cases of DF in  Tertiary Care Hospitals in Jodhpur, Rajasthan.Methods: A cross-sectional study was conducted in all cases of DF registered in the associated group of Hospitals of Dr. S.N. Medical College, Jodhpur from 1st January 2018 to 31st December 2018. Rapid immune-chromatographic card test and MAC ELISA test method was used to detect dengue non-structural protein 1 (NS1) antigen and dengue immunoglobulin M (IgM) antibodies in the Viral Research Diagnostic Laboratory (VRDL) of Department of Microbiology, Dr. S.N. Medical College to confirm the diagnosis. Results: Out of 2701 patients, 541 patients were tested serologically positive for DF (NS1, IgM). The highest number of suspected cases (1061) was reported in the month of October, 2018 out of whom 228 were positive. Maximum number of dengue cases reported were males belonging to 31-40 years age group from urban area. Fever was the main complaint in all the cases followed by vomiting, headache, and abdominal pain.Conclusion: Dengue is one of the major public health problems in India. A large number of cases are reported in the monsoon and post-monsoon period in the months from  September to December. Measures can be taken both at personal and government level to reduce morbidity and mortality from dengue

Sharp change over from compound nuclear fission to shape dependent quasi fission

Fission fragment mass distribution has been measured from the decay of $^{246}$Bk nucleus populating via two entrance channels with slight difference in mass asymmetries but belonging on either side of the Businaro Gallone mass asymmetry parameter. Both the target nuclei were deformed. Near the Coulomb barrier, at similar excitation energies the width of the fission fragment mass distribution was found to be drastically different for the $^{14}$N + $^{232}$Th reaction compared to the $^{11}$B + $^{235}$U reaction. The entrance channel mass asymmetry was found to affect the fusion process sharply.Comment: 4 pages,6 figure