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Islam Q.A.,Indian Central Glass and Ceramic Research Institute | Raja M.W.,State Forensic Science Laboratory | Basu R.N.,Indian Central Glass and Ceramic Research Institute
International Journal of Hydrogen Energy | Year: 2016

The present study aims to develop a series of novel perovskite based materials with a nominal composition of LaxSr1-xBi0.2Co0.35Fe0.45O3-δ (x = 0.5 to 0.8) as oxygen separation membranes. The powder has been synthesized by a soft chemical alanine assisted combustion method. X-ray diffractograms of calcined powders reveal orthorhombic perovskite structure. The optical properties measured by UV-VIS spectroscopy suggest that the variation of lanthanum concentration has mere effect in the electron density as well as band gap of the membranes. Total electrical conductivity as calculated is maximum for the composition with lowest lanthanum concentration (La = 0.5). The permeation flux as measured reveals that the flux generally decreases as the lanthanum concentration increases in the stoichiometry. A highest oxygen permeation flux of 0.23 ml/min/cm2 has been achieved for the composition La0.5Sr0.5Bi0.2Co0.35Fe0.45O3-δ at 900 °C. © 2016 Hydrogen Energy Publications, LLC.

Saini K.,Punjabi University | Saroa J.S.,State Forensic Science Laboratory
Journal of Forensic Identification | Year: 2011

In this study, an attempt was made to differentiate 28 processed color toners and 10 raw samples using thin-layer chromatography (TLC), ultraviolet spectroscopy (UV), and fourier transform infrared (FTIR) spectroscopy. When all of these methods were used, most of the toners were able to be differentiated.

Ahmed G.,University of Rajasthan | Dashora A.,University of Rajasthan | Sharma M.,State Forensic Science Laboratory | Ahuja B.L.,University of Rajasthan
Applied Radiation and Isotopes | Year: 2010

In this paper, we present the first-ever experimental Compton line shapes of HgBr2 and HgI2 using 137Cs Compton spectrometer. To compare our experimental momentum densities, we have computed the Compton profiles using Hartree-Fock and density functional theory within linear combination of atomic orbitals. We have also computed the energy bands and density of states using the linear combination of atomic orbitals and full potential linearized augmented plane wave method. On the basis of equal-valence-electron-density profiles, it is seen that HgI2 is more covalent than HgBr2 which is in agreement with the valence charge densities. The experimental isotropic profiles are found to be relatively in better agreement with the Hartree-Fock data. We have also discussed the photoluminescence and detection properties of both the halides. © 2009 Elsevier Ltd. All rights reserved.

Kumar S.,State Forensic Science Laboratory | Ma Y.G.,CAS Shanghai Institute of Applied Physics
Physical Review C - Nuclear Physics | Year: 2015

The phase space obtained using the isospin quantum molecular dynamical (IQMD) model is analyzed by applying the binding energy cut in the most commonly and widely used secondary cluster recognition algorithm. In addition, for the present study, the energy contribution from momentum-dependent and symmetry potentials is also included during the calculation of total binding energy, which was absent in clusterization algorithms used earlier. The stability of fragments and isospin effects are explored by using the new clusterization algorithm. The findings are summarized as follows: (1) The clusterization algorithm identifies the fragments at quite early time. (2) It is more sensitive for free nucleons and light charged particles compared to intermediate mass fragments, which results in the enhanced (reduced) production of free nucleons (light charged particles, or LCPs). (3) It has affected the yield of isospin-sensitive observables - neutrons (n), protons (p), H3,He3, and the single ratio [R(n/p)] - to a greater extent in the mid-rapidity and low kinetic energy region. In conclusion, the inclusion of the binding energy cut in the clusterization algorithm is found to play a crucial role in the study of isospin physics. This study will give another direction for the determination of symmetry energy in heavy-ion collisions at intermediate energies. © 2015 American Physical Society.

Nirmalkar J.,Pandit Ravishankar Shukla University | Deb M.K.,Pandit Ravishankar Shukla University | Deshmukh D.K.,Pandit Ravishankar Shukla University | Verma S.K.,State Forensic Science Laboratory
Bulletin of Environmental Contamination and Toxicology | Year: 2013

The effects of combustion of the fire crackers on the air quality in eastern Central India were studied for the first time during Diwali festival. This case study analyzes the size distribution and temporal variation of aerosols collected in the rural area of eastern Central India during pre-diwali, Diwali and post-diwali period for the year of 2011. Fifteen aerosol samples were collected during the special case study of Diwali period using Andersen sampler. The mean concentrations of PM10 (respirable particulate matter) were found to be 212.8 ± 4.2, 555.5 ± 20.2 and 284.4 ± 5.8 during pre-diwali, Diwali and post-diwali period, respectively. During Diwali festival PM10 concentration was about 2.6 and 1.9 times higher than pre-diwali and post-diwali period, respectively. PM2.5 (fine) and PM1 (submicron) concentrations during Diwali festival were more than 2 times higher than pre-diwali and post-diwali. © 2012 Springer Science+Business Media New York.

Kumar R.,State Forensic Science Laboratory
Forensic Science International | Year: 2010

Bayesian statistics was applied to a small sample database of the tensile properties of five different brands of writing paper which were perceptibly similar. The measured parameters in the database were found to overlap for the five brands. This posed a limitation to the application of the classical approach for "match" or "no match". It was found that using Bayesian statistics for source correspondence, a mere 2-3 measurements corresponding to a particular brand raised the probabilities associated with that brand to as high a 72% and eliminating a couple of brands. © 2009 Elsevier Ireland Ltd. All rights reserved.

Rana A.K.,State Forensic Science Laboratory | Ankri S.,Technion - Israel Institute of Technology
Frontiers in Genetics | Year: 2016

RNA, the earliest genetic and catalytic molecule, has a relatively delicate and labile chemical structure, when compared to DNA. It is proneto be damaged by alkali, heat, nucleases, or stress conditions. One mechanism to protect RNA or DNA from damage is through site-specific methylation. Here, we propose that RNA methylation began prior to DNA methylation in the early forms of life evolving on Earth. In this article, the biochemical properties of some RNA methyltransferases (MTases), such as 2'-O-MTases (Rlml/RlmN), spOUT MTases and the NSun2 MTases are dissected for the insight they provide on the transition from an RNAworld to our present RNA/DNA/protein world. © 2016 Rana and Ankri.

Kumar R.,Regional Forensic Science Laboratory | Patial N.,State Forensic Science Laboratory | Singh S.,State Forensic Science Laboratory
Journal of Forensic Sciences | Year: 2013

Linkage of a cutting tool (a sickle) with a telephone cable of 100 pairs of copper wires is reported in a case of theft of a telephone cable. Telephone cables contain numerous insulated copper wires of small diameter inside an outer covering and are stolen for the relatively precious copper. The cutting pattern of the cable can only point to the type of the tool but because of the large number of copper wires, it is practically difficult to make a definite linkage with the tool used to cut the cable by comparing the tool marks. The present work reports the successful attempt of the authors in establishing a definite linkage of a stolen telephone cable with a sickle recovered from the suspects. Spot microchemical test was performed for detection of copper on the blade of the sickle, and then tool mark comparison was performed to link the tool marks on the metal strip inside the outer covering of the cable to the blade of the sickle. © 2012 American Academy of Forensic Sciences.

Kumar S.,State Forensic Science Laboratory
EPJ Web of Conferences | Year: 2015

In the present work, the Quantum Molecular Dynamical (QMD) model is summarized as a useful tool for the incident energy range of 50 to 1000 MeV/nucleon in heavy-ion collisions. The model has reproduced the experimental results of various collaborations such as ALADIN, INDRA, PLASTIC BALL and FOPI upto a high level of accuracy for the phenomena like multifragmentation, collective flow as well as elliptical flow in the above prescribed energy range. The efforts are further in the direction to predict the symmetry energy in the wide incident energy range. © Owned by the authors, published by EDP Sciences, 2014.

Kumar R.,State Forensic Science Laboratory
Journal of Forensic Sciences | Year: 2011

An organization had approved the sample of writing paper, and accordingly the supplier had to execute the supply. The supply received was suspected to be of different quality from approved one. The organization sent the samples for comparison to the Forensic Science Laboratory. Both the approved and supplied samples were compared using Tensile Testing Method with the Material Testing Machine and Fluorescence and spectral analysis using the Video Spectral Comparator (VSC2000). The difference between the mean loads at peak before rupture in the tensile testing mode for the two samples was about 33%. The two samples differed significantly in terms of UV fluorescence, and there was about 5% average difference in the percentage of maximum reflected intensity in the wavelength region of 400-900nm. It has been observed in this study that these two methods can adequately distinguish paper samples of different origin. © 2011 American Academy of Forensic Sciences.

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