Gandhi Institute of Technology and Management

About: Gandhi Institute of Technology and Management is a education organization based out in Visakhapatnam, Andhra Pradesh, India. It is known for research contribution in the topics: Computer science & Heat transfer. The organization has 3392 authors who have published 4043 publications receiving 29139 citations. The organization is also known as: GITAM & GITAM College.

Experimental Investigations on Performance, Combustion, and Emission Characteristics of Niger (Guizotia abyssinica) Seed Oil Methyl Ester Blends with Diesel at Different Compression Ratios

Abstract: In this study, the fuel performance, combustion, and emission characteristics were tested on four-stroke, multi-fuel variable compression research engine with different blends of Niger seed oil methyl ester (NSOME). Experiments were carried out at four test fuels of standard diesel, B10, B20, and B40 and at three different compression ratios (CRs) of 16, 17.5, and 18.5. Experimental results of the study revealed that the NSOME has alike characteristics of standard diesel oil. The brake thermal efficiency (BTE) of blend B20 was found to be nearer to standard diesel and decreased for blends B10 and B40. Brake-specific fuel consumption (BSFC) of the NSOME blends increased compared to standard diesel. Further, cylinder pressure and net heat release rate of NSOME blends increased significantly with blend ratio and B20 showed higher value as compared with standard diesel fuel. A notable reduction in CO, UHC, and smoke emissions was observed with all three blends of NSOME with an increase in NOx emissions. The same trend was continued for all three compression ratios. Among all three blends of NSOME, B20 has shown better results concerning performance, combustion, and emissions at CR 18.5. At CR 18.5, the BSFC, CP, NHRR, and NOx emissions of B20 were increased by 1.45%, 1.75%, 5.62%, and 10.76%, while BTE, CO, UHC, and smoke opacity were decreased by 1.65%, 58.40%, 38.93%, and 5.09%, respectively, at full load (12 kgf).

A plane symmetric cosmological model in Lyra manifold

Abstract: A non-static plane-symmetric cosmological model in Lyra's manifold is obtained when the source of the gravitational field is a perfect fluid with pressure equal to energy density. Some properties of the model have also been discussed.

Photoinduced Changes in Aromaticity Facilitate Electrocyclization of Dithienylbenzene Switches.

Abstract: The concepts of excited-state aromaticity and antiaromaticity have in recent years with increasing frequency been invoked to rationalize the photochemistry of cyclic conjugated organic compounds, w...

Study on electric modulus, complex modulus and conductivity properties of Nb/Sm, Gd doped barium titanate-lithium ferrite ceramic composites

Abstract: The (90)BaTi(1−2x) YxNbxO3 + (10)Li0.5Fe2.5O4 (Y = Gd, Sm and x = 0, 0.05, 0.1) composites are prepared using the solid state method. The structural properties like X-ray diffraction (XRD), FESEM, electrical properties like electric modulus (M′), complex electric modulus (M″) and conductivity properties of doped and undoped composites have been discussed. The XRD studies confirm the tetragonal structure of all composites. FESEM studies reveal an increase in the average grain size of the (90)BaTiO3 + (10)Li0.5Fe2.5O4 composite upon doping with Gd/Nb and Sm/Nb. As and when the temperature of the sample is decreased, with frequency is similar but its conductivity has decreased. In the high frequency region, the frequencies beyond 100 MHz, the conductivity of all composites are not zero, which shows the existence of hopping of electrons to a new site. The real electric modulus (M′) of composites confirm the occurrence of dispersion in all composites at all temperatures. The imaginary electric modulus (M″) increases with frequency and exhibits a peak at a certain frequency. The relaxation time of all composites reveals the short range movement of charge carriers. The nearly same value of activation energy of all composites reveals that the distribution of energy barriers in the Gd/Nb and Sm/Nb doped 0.9BT0.1LF composites. The area of semicircles of all composites increase and the shift of the intercept of a semicircle towards the higher value of M′ represents an increase in the capacitance. The normalized scaling behavior of all composites is studied by plotting normalized parameters M″/M″maxVs Log (f/fmax).

Solid lubricants in machining

Abstract: This article presents a review of solid lubricants application in different machining processes such as grinding, milling, drilling, and turning. Of late, several reasons have led to the increased usage of solid lubricants in machining. The heat generated in the cutting zone during machining is critical in deciding the workpiece quality. Although cutting fluids are widely employed to carry away the heat in machining, their usage poses threat to ecology and the health of workers. Hence, there arises a need to identify eco-friendly and user-friendly alternatives to conventional cutting fluids. Modern tribology has facilitated the use of solid lubricants as an alternative to cutting fluids in machining. Graphite, calcium fluoride, molybdenum disulphide, and boric acid are the general solid lubricants used in machining. Process performance is improved with the application of solid lubricants in machining. By reducing coefficient of friction, cutting forces and tool wear are reduced in machining with solid lub...