Birla Institute of Technology and Science

About: Birla Institute of Technology and Science is a education organization based out in Pilāni, Rajasthan, India. It is known for research contribution in the topics: Computer science & Population. The organization has 8897 authors who have published 13947 publications receiving 170008 citations.

Kantowski-Sachs Universe Filled with Perfect Fluid in f( R, T) Theory of Gravity

Abstract: The exact solutions of the field equations in respect of Kantowski-Sachs universe filled with perfect fluid in the framework of f(R,T) theory of gravity (Harko et al. in Phys. Rev. D 84:024020, 2011) is derived. A cosmological model with an appropriate choice of the function f(T) is constructed. The physical behavior of the cosmological model is studied. Some important features of astrophysical phenomena, like Hubble’s parameter H(z), luminosity distance (d L ) and distance modulus μ(z) with red-shift are also discussed.

Magnetically Separable Nanospherical g-C3N4@Fe3O4 as a Recyclable Material for Chromium Adsorption and Visible-Light-Driven Catalytic Reduction of Aromatic Nitro Compounds

Abstract: Graphite-like graphitic carbon nitride (g-C3N4) has gained considerable interest in the past few years. However, merely a few studies have been undertaken regarding the application of g-C3N4 for metal adsorption and visible-light-driven reduction of aromatic nitro compounds. Here, we describe a versatile method for the preparation of g-C3N4 nanocomposite decorated with magnetite nanoparticles (g-C3N4@Fe3O4NPs) that subsequently showed their efficiency in sequestration of Cr(VI)/Cr(III) and NaBH4-mediated conversion of 2-nitroaniline (2-NA) and 4-nitroaniline (4-NA) under visible-light exposure. The as-synthesized g-C3N4@Fe3O4NPs adsorbent revealed excellent water dispersibility, superior magnetic property, and porous structure. Numerous surface hydroxyls (−OH) and amino groups (−N, −NH, −NH2) enabled g-C3N4@Fe3O4NPs to rapidly isolate Cr(VI) from aqueous solution through applying an outer magnetic field. The adsorbed Cr(VI) on the g-C3N4@Fe3O4NPs surface offered a maximum equilibrium adsorption capacity o...

Cow urine as a potential source for struvite production

Abstract: Rock phosphate deposits are non-renewable and are facing a decline. Due to this, phosphate fertilizers are going to be limited in future. Struvite is a crystalline mineral substance containing equimolar amount (1:1:1) of magnesium ammonium and phosphate ions (MgNH4PO4·6H2O), a good source of phosphorus and a slow release fertilizer. In the present study it was crystallized from cow urine using brine as cheap source of magnesium. Cow urine and brine was mixed at different proportion to find out the optimum concentration for struvite crystallization. Crystallized struvite was characterized by X-ray diffraction, thermogravimetric and differential thermal analysis, Fourier transform infrared spectroscopy and scanning electron microscopy and energy dispersive spectroscopy. The ratio of 1:0.5 cow urine and brine mixing gave the best quality struvite at pH 9. The analysis of struvite for phosphate, magnesium and ammonium ions showed 5.85, 3.16, and 0.56 % respectively. The fertilizer potential of struvite was evaluated on the growth of Vigna radiata. The best growth was observed in the pots where struvite was added at a concentration of 2 g/kg of soil. Struvite is a good source of phosphate and it can be recovered from livestock waste such as cow urine. Struvite can be made from a renewable source for a sustainable agricultural development. Theoretically at the yield of 40 g/L a total of 12,176 tons struvite could be made per day all over India for fertilizer use.

Fabrication of electron beam physical vapor deposited polysilicon piezoresistive MEMS pressure sensor

Abstract: MEMS pressure sensor fabrication introduce a number of challenges to handle the processed wafers in batch fabrication after bulk-micromachining In this paper, fabrication process sequence was optimized where photolithography steps were reduced after the diaphragm formation Reactive ion etching (RIE) and low pressure chemical vapor deposition (LPCVD) has been replaced during the modified process Polysilicon thin film based on electron beam physical vapor deposition (EBPVD) was optimized for required sheet resistivity MEMS pressure sensor rooted on EBPVD polysilicon piezoresistive sensing element was successfully fabricated and characterized in terms of sensitivity, linearity and repeatability