Performance of an Orifice Compensated Two-Lobe Hole-Entry Hybrid Journal Bearing

The work presented in this paper aims to study the performance of a two-lobe hole-entry hybrid journal bearing system compensated by orifice restrictors. The Reynolds equation governing the flow of lubricant in the clearance space between the journal and bearing together with the equation of flow through an orifice restrictor has been solved using FEM and Galerkin's method. The bearing performance characteristics results have been simulated for an orifice compensated nonrecessed two-lobe hole-entry hybrid journal bearing symmetric configuration for the various values of offset factor (), restrictor design parameter (2), and the value of external load (0). Further, a comparative study of the performance of a two-lobe hole-entry hybrid journal bearing system with a circular hole-entry symmetric hybrid journal bearing system has also been carried out so that a designer has a better flexibility in choosing a suitable bearing configuration. The simulated numerical results indicate that for the two-lobe symmetric hole-entry hybrid journal bearing system with an offset factor () greater than one provides 30 to 50 percent larger values of direct stiffness and direct damping coefficients as compared to a circular symmetric hole-entry hybrid journal bearing system

Effects of noise on a model of oscillatory chemical reaction

A simple oscillating reaction model subject to additive Gaussian white noise is investigated as the model is located in the dynamic region of oscillations. The model is composed of three ordinary differential equations representing the time evolutions of X, Y, and Z, respectively. Initially, a uniform random noise is separately added to the three equations to study the effect of noise on the oscillatory cycle of X, Y, and Z. For a given value of noise intensity, the amplitude of oscillation increases monotonically with time. Furthermore, the noise is added to any one of the three equations to study the impact of noise on one species on the bifurcation behavior of the other

Electrical Conductivity Studies on Co(II), Cu(II), Ni(II) and Cd(II) Complexes of Azines

Abstract: 1-Phenyl-4-(2'-hydroxyphenyl-1-yl)di-imino azine, {1P-4-(2' HPDA)} 1, 4(2'-hydroxyphenyl-1-yl)di-imino azine, {1, 4-(2' HPDA)} are derived from benzophenone hydrozone with different aldehydes in presence of few drops of concentrated hydrochloric acid in alcoholic medium. Metal(II) complexes have been prepared by salts of CoCl 2 , CuCl 2 , NiCl 2 and CdCl 2 reacting with azine ligands dissolved in alcohol in the molar ratio of (1:2). The prepared complexes were characterized by using various physical methods viz. elemental, molar conductance, magnetic susceptibility, IR, NMR, XRD and UV-Visible. Conductivity of the powder samples were measured by two probe method. Measured electrical conductivities of Co(II), Cu(II), Ni(II) and Cd(II) complexes of azines are reported in this paper. It is found that at room temperature these complexes show insulator behavior. At higher temperature conductivity increases linearly, showing semi conducting behavior

A ternary PEDOT-TiO2-reduced graphene oxide nanocomposite for supercapacitor applications

A ternary composite of PEDOT was prepared with TiO2 via emulsion polymerization method adjusting various weight ratios of TiO2 to PEDOT and synthesized rGO was then blended with this composite. The FTIR, UV–Vis and XRD analysis displayed characteristic features of PEDOT and TiO2. The morphology of the nano-hybrid structure was additionally investigated by SEM analysis. Pore size and surface area analysis of particles were characterized by BET method. The electrochemical analysis showed that the specific capacitance (Csp) for PEDOT-TiO2-15-rGO was 18.9 F.cm-2 at 0.1 mA g-1 current density

Microwave absorption studies of polyaniline nanocomposites containing Poly (2-acrylamido-2- methyl-1-propanesulfonicacid)/graphene nanoplatelet

Polymer nano-composites polyaniline containing poly(2-acrylamido-2-methyl-1-propanesulfonicacid) and graphene nanoplatelets were prepared via in situ deposition. The nanopolymer composites were studied for their characterization and structural morphologies. Pellets were prepared by conventional techniques were used to study the microwave absorption properties in the microwave range of 10-80 GHz range, and the effects of sample thickness on the microwave absorption were investigated. Based on the observations the prepared nanocomposites are cost-effective and will be very useful for interdisciplinary applications

Partially degradable electrically conductive poly (3,4-ethylenedioxy-thiophene)/sigma cellulose polymer composites

Poly (3,4-ehtylenedioxythiophene) (PEDOT) nanocomposites, including a biodegradable Sigma Cellulose (SC), were prepared byin situ polymerization technique and characterized by FT-IR spectra. Morphological studies of the composites were performed using transmission electron microscopy.Results of characterization and surface morphology indicated a strong interaction between PEDOT and SC. The results of electrochemical properties of PEDOT/SC showed that the addition of SC exhibited remarkable improvement in the conductivityof the PESC composites

A conceptual study on 'Green Management' in food processing industry

The word 'Green' generally is referred to healthy and a clean atmosphere. 'Green' blends into the other topics of sustainability, pollution control, and conservation. The concept of being or going 'Green' is given due importance in all the business firms as it is considered imperative to a healthy society. Many countries aim at achieving a green economy which is defined as a sustainable economy and society with zero carbon emissions as there is a threat of global warming. A green economy rigorously applies the triple bottom line of people, planet and profits across all corporations at the microeconomic level and throughout entire economy at macroeconomic level. This paper attempts to study the concept of 'Green' applied in the food processing industry. Food Processing is a branch of food science. The United States Federal Food, Drug and Cosmetic Act, Section 201, Chapter II, defines processed food as "any food other than a raw agricultural commodity and includes any raw agricultural commodity that has been subject to processing, such as canning, cooking, freezing, dehydration, or milling." Food processing is the method and technique used to transform raw ingredients into food for human consumption. The green growth model recognizes the steps to protect and conserve environmental resources, which can be a driver for national and global economic progress

Economic Analysis of Post-harvest Losses in Food Grains in India: A Case Study of Karnataka

The post-harvest losses have been estimated at different stages in two major food grains, viz. rice and wheat in India. The time series data from 1982-83 to 2001-02 on area, production and productivity of the selected food grains have been subjected to growth rate analysis. The post-harvest losses have been estimated using the survey data collected from 100 farmers, 20 wholesalers, 20 processors and 20 retailers in each crop in Karnataka for the year 2003-04. Tabular analysis has been used to estimate the post-harvest losses at different stages, and functional analysis has been used to assess the influence of socio-economic factors on postharvest losses at the farm level. The increase in rice production in the study district of Shimoga has been mainly from increased area under rice. The increased rice output at the state level is the result of increased productivity and area, while at the national level it is the rise in productivity. The increased wheat output in the country has been due to increased wheat productivity. The postharvest losses at the farm level have been estimated to be 3.82 kg/ q for rice and 3.28 kg/q for wheat. The losses have been highest during storage in both the crops. The factors that influence the post-harvest losses significantly at the farm level have been identified and some policy implications have been highlighted

Studies on surface morphology and thermal stability of polypyrrole-poly (e-caprolactone) polymer composites

: Polypyrrole (PPy) polymer composites were prepared via chemical polymerization of the pyrrole monomer in an aqueous solution using different weight percentages of poly(e-caprolactone) (PCL) (10, 20, 30, 40, and 50 wt%) as the dopant and ammonium per sulfate as the oxidant. The cryst-allinity of the synthesized PPy-PCL composites was dete-rmined using X-ray diffraction, and the surface morphology was observed under scanning electron and transmission electron microscopes. Thermogravimetry, differential thermogravimetry, and differential scanning calorimetry were used to study the thermal stability of the compo-sites, which was found higher than that of pure PPy. The improvement in the thermal stability of the PPy-PCL composites is attributed to the interaction between PPy and PCL, which restricts the thermal motion of the PPy chains and prevents the degradation of PPy