Archives

Volume 5 Number 2 February 2019

Blockchain for Real Estate Industry


Authors: Somi S. Thota
Pages: 53-56
DOI: doi.org/10.32861/sr.52.53.56
Abstract
Blockchain technology is one of the latest technologies on the horizon and has evolved over the last 7-10 years. There is tremendous potential for usage of Blockchain technology in today’s Real Estate industry. This paper aims to analyze the disruptive power of Blockchain digital technologies in the real estate industry. This paper will start with an introduction of the blockchain technology and high-level technical overview. It will then go on to discuss the various benefits the Real Estate industry can reap from this technology. It will also put forth various use cases or opportunities in the Real Estate sector for this technology. In the end, the paper will also discuss the present-day limitations and the questions marks over this technology in relation to its usage for the Real Estate industry.

Biodegradation of Hexavalent Chromium from Paint Industry Effluent by Indigenous Bacteria


Authors: Tofa Begum ; Md. Imranul Hoq ; Md. Zahidul Haque Bulbul ; Jumana Mahmud ; Md. K. Pramanik ; Md. Abu Hena Mostofa Kamal ; Md. Naimul Islam ; Ruhul A. Khan
Pages: 45-52
DOI: doi.org/10.32861/sr.52.45.52
Abstract
Hexavalent chromium (Cr-VI) is toxic, mutagenic and carcinogenic chemical, whereas its reduced trivalent form (Cr-III) is much less toxic. Cr-VI is widely used in paint industry, tannery industry, and so on. In the present study an attempt was made to isolate naturally occurring bacteria from paint industry effluent possessing high potentiality to reduce Cr-VI. Seven efficient chromium reducing bacterial strains were isolated as Bacillus korlensis, Bacillus subtilis, Bacillus cereus, Micrococcus luteus, Micrococcus varians, Enterobacter intermedius and Tatumella terrea. These bacteria reduced chromium in culture media at maximum 5 mM concentration within a period of 24–72 h as determined by 1, 5-diphenylcarbazide (DPC) colorimetric method. However, significant Cr-VI reduction or biodegradation was observed at 1.25 mM substrate concentration within 24 h at 37°C. The research was very promising for development of a microbiological process to be used in the removal of toxic hexavalent chromium from the environment.

Study of Microstructural, Electrical and Dielectric Properties of La0.9Pb0.1MnO3 and La0.8Y0.1Pb0.1MnO3 Ceramics


Authors: S. A. Saleh
Pages: 33-44
DOI: doi.org/10.32861/sr.52.33.44
Abstract
The present work studies the microstructural and electrical properties of La0.9Pb0.1MnO3 and La0.8Y0.1Pb0.1MnO3 ceramics synthesized by solid-state route method. Microstructure and elemental analysis of both samples were carried out by field emission scanning electron microscope (FESEM) and energy dispersive spectroscopy (EDS) method, respectively. Phase analysis by X-ray diffraction (XRD) indicated formation of single phase distorted  structure. The XRD data were further analyzed by Rietveld refinement technique. Raman analysis reveals that Y atom substitutes La site into the LPMO with shifting of phonon modes. The temperature variation of resistivity of undoped and Y-doped La0.9Pb0.1MnO3 samples have been investigated. The electrical resistivity as a function of temperature showed that all samples undergo an metal-insulator (M-I) transition having a peak at transition temperature TMI. Y-doping increases the resistivity and the metal-insulator transition temperature (TMI) shifts to lower temperature. The temperature-dependent resistivity for temperatures less than metal-insulator transition is explained in terms the quadratic temperature dependence and for T > TMI, thermally activated conduction (TAC) is appropriate. Variation of frequency dispersion in permittivity and loss pattern due to La-site substitution in LPMO was observed in the dielectric response curve.