Advancing ethnic foods in diverse global ecologies through systems-based solutions is essential to global food security and climate resilience–integrated human health benefits

Kalidas Shetty,Dipayan Sarkar 한국식품연구원 2018 Journal of Ethnic Foods Vol.5 No.1

The face of global food security challenges has changed and must address both needs of sufficient macronutrients and micronutrients to counter overall malnutrition that exists in several regions of the world and also new more rapid emergence of diet-linked noncommunicable chronic diseases (NCDs). Therefore, the current global food and nutritional security strategies must be improved to generate adequate global food production from a wide diversity of crops that will meet macronutrient/micronutrient needs along with beneficial bioactive ingredients to counter diet-linked NCDs.

Influence of chemical reaction and viscous dissipation on MHD mixed convection flow

Kalidas Das 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5

This paper investigates the effect of chemical reaction and viscous dissipation on MHD mixed convective heat and mass transfer flowof a viscous, incompressible, electrically conducting second grade fluid past a semi-infinite stretching sheet in the presence of thermaldiffusion and thermal radiation with Rosseland approximation. The governing boundary layer equations are written into a dimensionlessform by similarity transformations. Numerical results for the dimensionless velocity, temperature, concentration profiles as well as for theskin friction coefficient, Nusselt number and Sherwood number are obtained and displayed through graphs and tables for pertinent parametersto show interesting aspects of the solution.

Cu-water nanofluid flow and heat transfer over a shrinking sheet

Kalidas Das 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12

The influence of an external magnetic field and thermal radiation on Cu-water nanofluid flow and heat transfer over a shrinking sheetwith slip surface was studied. The governing partial differential equations for steady two dimensional flows are reduced to self-similarordinary differential equations by similarity transformation technique and then solved numerically using Runge-Kutta-Fehlberg methodwith shooting technique. Physical interpretation of various embedding parameters is assigned through graphs and tables for the velocityand temperature profiles as well as for skin friction coefficient and Nusselt number.

Investigation of the Effects of Different Models of Nanofluids on their Flow and Heat Transfer Characteristics

Kalidas Das,Nilangshu Acharya,Prabir Kumar Kundu 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.7

This paper is devoted to an investigation of the influences of thermal radiation on an unsteady, mixed, convection boundary layer flow and the heat transfer over a vertical heated permeable stretching sheet embedded in a porous medium. Different models of the nanofluid based on different formulae for the thermal conductivity and the dynamic viscosity and their effects on the fluid flow and the heat transfer characteristics are discussed. Using the similarity transformation, we transform the governing equations into similarity, non-linear, ordinary differential equations which are solved by employing a numerical shooting technique with a fourth-order Runge-Kutta integration scheme. The obtained results are presented graphically, and the physical aspects of the problem are discussed.

Nanofluid bioconvection in presence of gyrotactic microorganisms and chemical reaction in a porous medium

Kalidas Das,Pinaki Ranjan Duari,Prabir Kumar Kundu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11

In this paper, we investigate the hydromagnetic bioconvection of gyrotactic microorganisms past a permeable vertical plate embeddedin a porous medium filled with a water-based nanofluid. The model for the nanofluid, proposed by Kuznetsov and Nield [23], incorporatesBrownian motion, thermophoresis, bioconvection of gyrotactic microorganisms and chemical reaction. Using appropriate similaritytransformations, the model boundary value problem is tackled numerically using bvp4c function from Matlab. The influences of bioconvectionparameters, chemical reaction parameter, inverse Darcy number etc on the velocity, temperature, nanoparticle concentration andthe micro-organisms density profiles are analyzed and discussed in detail. A comparative analysis of our results with previously reportedresults in the literature is given.

LAWC: Optimizing Write Cache Using Layout-Aware I/O Scheduling for All Flash Storage

Ganesh, Kalidas,Kim, Youngjae,Debnath, Monobrata,Park, Sungyong,Lee, Junghee IEEE 2017 IEEE Transactions on Computers Vol. No.

<P>Flash memory-based SSD-RAIDs are swiftly replacing conventional hard disk drives by exhibiting improved performance and stability, especially in I/O-intensive environments. However, the variations in latency and throughput occurring due to uncoordinated internal garbage collection cripples further boosting of performance. In addition, the unwanted variations in each SSD can influence the overall performance of the entire flash storage adversely. This performance bottleneck can be essentially reduced by an internal write cache in the RAID controller designed prudently by considering the crucial device characteristics. The state-of-the-art cache write for the RAID controller fails to incorporate device characteristics of flash memory-based SSDs and mitigates the performance gain. In this paper, we propose a novel cache design namely Layout-Aware Write Cache (LAWC) to overcome the performance barrier inculcated by independent garbage collections. LAWC implements (i) improved I/O scheduling for logically partitioned write caches, (ii) a destage write synchronization mechanism to allow individual write caches to flush write blocks into the SSD array in a coordinated manner, and (iii) a two-level hybrid cache algorithm utilizing small front level cache for the improved write cache efficiency. LAWC shows significant reduction in response time by 82.39 percent on RAID-0 and 68.51 percent on RAID-5 types of SSDs when compared with state-of-the-art write cache algorithms.</P>

Heat and mass transfer of a second grade magnetohydrodynamic fluid over a convectively heated stretching sheet

Das, Kalidas,Sharma, Ram Prakash,Sarkar, Amit Society for Computational Design and Engineering 2016 Journal of computational design and engineering Vol.3 No.4

The present work is concerned with heat and mass transfer of an electrically conducting second grade MHD fluid past a semi-infinite stretching sheet with convective surface heat flux. The analysis accounts for thermophoresis and thermal radiation. A similarity transformations is used to reduce the governing equations into a dimensionless form. The local similarity equations are derived and solved using Nachtsheim-Swigert shooting iteration technique together with Runge-Kutta sixth order integration scheme. Results for various flow characteristics are presented through graphs and tables delineating the effect of various parameters characterizing the flow. Our analysis explores that the rate of heat transfer enhances with increasing the values of the surface convection parameter. Also the fluid velocity and temperature in the boundary layer region rise significantly for increasing the values of thermal radiation parameter.

Ag-water nanofluid flow over an inclined porous plate embedded in a non-Darcy porous medium due to solar radiation

Tanmoy Chakraborty,Kalidas Das,Prabir Kumar Kundu 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5

The heat absorber uses in solar power plants have generally low energy adaptation owing to large emissive losses at high temperature. Recently, nanofluid based solar energy absorber have acknowledged immense scientific curiosity to competent share and store the thermal energy. Here we examine theoretically the natural convective flow of an Ag nanoparticle based nanofluid flow along an inclined flat sheet embedded in a Darcy-Forchheimer permeable medium coexistence of solar radiation. By use of similarity transformations, the fundamental partial differential system and boundary conditions are tackled numerically using Runge-Kutta Gill based shooting procedure. The impacts of governing parameters upon the flow, temperature, Nusselt number and skin friction coefficient are represented tabular as well as in graphical form.

On the heat transport mechanism and entropy generation in a nozzle of liquid rocket engine using ferrofluid: A computational framework

Nilankush Acharya,Kalidas Das,Prabir Kumar Kundu 한국CDE학회 2019 Journal of computational design and engineering Vol.6 No.4

An investigation has been carried out to demonstrate the performance of heat transfer and entropy gen-eration in a regenerative cooling channel of a rocket engine. The Nanofluid flow in composition with fer-rous nanoparticles has been utilized. Foremost equations are reduced to its non-dimensional shape using similarity renovation and sketched out using variational iterative method (VIM). Impression of the per-tinent factors on hydrothermal performance has been brought forwarded via tables and graphs. Favourable comparison originates the basis of our present work. Result communicates that non-dimensional entropy generation amplifies in response to the parameter R and Bejan number intensifies for the parameter N. Significance or application of the present literature is to provide kerosene based fer-rofluid as a coolant of rocket engine and how pertinent factors affect the entropy inside the system. Parametric study of this investigation will aid aerospace engineers to design the regenerative equipment in an effective way.

Metabolic stimulation of phenolic biosynthesis and antioxidant enzyme response in dark germinated barley (Hordeum vulgare L.) sprouts using bioprocessed elicitors

Ramnarain Ramakrishna,Dipayan Sarkar,Kalidas Shetty 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4

Sprouting and seed elicitor treatments stimulatethe biosynthesis of health relevant phenolic bioactives inplants partly by upregulating proline-associated pentosephosphate pathway (PAPPP). This study investigated theupregulation of PAPPP-linked and antioxidant enzymeassociated metabolic responses in elicitor-treated barley(Hordeum vulgare L.) sprouts previously established withstimulation of health relevant phenolic bioactives. Barleyseeds were treated with bioprocessed elicitors marineprotein hydrolysates (GroPro , GP) and soluble chitosanoligosaccharide and germinated under dark conditions. Upregulation of PAPPP and subsequent stimulation ofphenolic biosynthesis and antioxidant enzyme responseswere monitored at day 2, 4, and 6 of sprouting. HighPAPPP-linked antioxidant enzyme responses wereobserved at early stages of germination with selected dosesof GP treatments, especially in cv. Pinnacle. Total solublephenolic content remained at higher level, while guaiacolperoxidase activity increased over the course of sproutingindicating increased phenolic polymerization to supportstructural needs of sprouts.