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Sumit Kumar Jindal,Kishan Kumar,Shulin Saraswat,Ajay Kumar,Sanjeev Kumar Raghuwanshi 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
There is a huge diff erence between electricity production and its demand. In order to meet the requirements, a selective power cut is carried out which is currently based on area and time. Although this is a simplistic solution, it has many drawbacks such as the area gets completely deprived of even the very basic appliances such as lights and fans, which do not contribute signifi cantly to the power consumption. This creates a need to come up with a solution so that no one gets deprived of using basic appliances at any time and still be able to reduce power consumption to fulfi ll the ever-growing demand. This work has dealt with the same by implementing a device selective protocol which can selectively cut power of particular devices depending on their energy rating, power rating, manufacturer etc. by the use of power line carrier communication. Hence, revolutionizing the whole concept of area selective power cut to device selective power cut. Since, IoT refers to a network of devices or “Things”, this work incorporates the basic principles of IoT by essentially creating a network of devices which can communicate with each other, over low bandwidth.
Spontaneous Rectal Perforation with Transanal Evisceration of the Small Bowel: A Rare Case Report
Pal Ajay Kumar,Kumar Prasoon,Yadav Dhirendra,Kumar Awanish,Pahwa Harvinder Singh,Singh Krishna Kant 대한외상중환자외과학회 2022 Journal of Acute Care Surgery Vol.12 No.2
Transanal evisceration of the small bowel is a rare surgical emergency. Rectal perforation in such cases is usually due to an underlying rectal prolapse. We report a case of a middle aged (45 years) male with spontaneous rectal perforation and transanal evisceration of the small bowel. Approximately 150 cm of small bowel had eviscerated transanally and the patient required emergent abdominal exploration, reposition of the small bowel, and repair of the rectal perforation. Small bowel evisceration through the anal verge is an emergent condition and the aim was to prevent life threatening complications related to sepsis.
Experimental and mathematical analysis of simulation results for sheet metal parts in deep drawing
Ajay Kumar Choubey,Geeta Agnihotri,C. Sasikumar 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
In this paper, deep drawing of conical and cylindrical cups without blank holder is investigated using a conical die design. These cups are produced by pushing circular blanks by pushing the flat head punch in a single stroke. ANSYS APDL 14.0 was then used to investigate the effects of die and punch geometry, half-cone angle, die and punch fillet radius, and drawing load. The thickness distribution of the cup was numerically investigated to determine the optimal process design, and mathematical analysis was adopted to determine the thickness distribution and longitudinal stress calculation. An experimental set-up was designed to validate the simulation results for conical and cylindrical shaped sheet-metal cups. Tensile tests were carried out to obtain the flow of the stress-strain curve for the simulation. The drawing characteristics of materials were investigated by performing Erichsen cupping and Vickers hardness tests. Experiments were conducted on blanks of aluminum alloys and stainless steel with initial thicknesses of 1.5 mm. A cylindrical cup of ss304 with LDR of up to 2.2 and conical cup of AA1100 with LDR of up to 2.7 were successfully achieved. Finite element simulation results showed good agreement with the mathematical and experimental results.
Ajay Kumar Goel,Meenu Jain,Pramod Kumar,Pennagaram Sarguna,Meera Bai,Neha Ghosh,Natrajan Gopalan 한국미생물학회 2011 The journal of microbiology Vol.49 No.2
Thirty-four Vibrio cholerae isolates collected from a cholera outbreak in Hyderabad, South India were found to belong to serogroup O1 biotype El Tor serotype Ogawa. The genotype of all the isolates was confirmed by PCR assays. All the isolates were found PCR positive for ctxAB, ompW, rfbO1, rtxC, and tcpA genes. All the isolates but one harboured rstR^(El Tor) allele. However, one isolate carried both rstR^(El Tor) as well as rstR^(Classical) alleles. Cholera toxin (ctxB) genotyping of the isolates confirmed the presence of altered cholera toxin B of classical biotype in all the isolates. All the isolates except VCH35 harboured an RS1-CTX prophage array on the large chromosome. The isolate VCH35 contained a tandem repeat of classical CTX prophage on the small chromosome. The clonal relationship among the V. cholerae isolates as carried out by enterobacterial repetitive intergenic consensus sequences PCR, BOX PCR and randomly amplified polymorphic DNA, uniformly showed a genetic relationship among the outbreak isolates. The results of this study suggest that altered El Tor biotype V. cholerae with the classical cholera toxin gene are involved in cholera outbreaks in India.
Implementation of an Efficient Algorithm for a Single Phase Matrix Converter
Ajay Kumar Gola,Vineeta Agarwal 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.2
An algorithm is developed that enables a single-phase matrix converter (SPMC) to perform functions of a generalized single phase power electronics converter such as acting as a frequency changer, rectifier, inverter, and chopper. This reduces the need for new converter hardware. The algorithm is implemented first on computer simulation software Orcad Capture CIS version 9.1. Simulation results are presented for five types of converters with a control input variable that decides the 1) type of converter and 2) type of output waveform. The simulated results verify the working and operation of a generalized converter based on SPMC. Simulated results are verified with experimental results. Hardware design is obtained using readily available ICs and other components. The trigger circuit has been tested qualitatively by observing waveforms on CRO. The operation of the proposed system has been found to be satisfactory.
Ajay Kumar,Arvind Singh Chauhan,Rohit Bains,Pralay Das 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
A sustainable, easy to operate, scalable, and chemically pre-treatments free method has been explored forrice straw (RS) biomass conversion to furfural, 5-hydroxymethylfurfural (5-HMF), lignin and bio-charproduction. Initially, the RS was dipped into liquid nitrogen in a thermos flask and grinded easily to finepowder for better handling of biomass under reaction conditions in a reactor. The process also reducesthe volume of biomass and enhances the surface area of RS biomass which was further analysed bySEM, TEM, IR, TGA and DSC, and further validated by its fruitful conversion to furfural, 5-HMF, ligninand bio-char synthesis in satisfied yields. The developed acidic process was performed at 130 C for 6hrs under a closed reaction system in reflux conditions. The ultra-performance liquid chromatography(UPLC) purity of furfural and 5-HMF was measured to >90% without additional purification technique. Moreover, the method was also examined in 250-gram scale and found to perform well.
Transient response of rhombic laminates
Ajay Kumar,Anish,Abhay K. Chaubey,Satyam Vishwakarma,Stanisław Fic,Danuta Barnat-Hunek 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.5
In the present study, a suitable mathematical model considering parabolic transverse shear strains for dynamic analysis of laminated composite skew plates under different types of impulse and spatial loads was presented for the first time. The proposed mathematical model satisfies zero transverse shear strain at the top and bottom of the plate. On the basis of the cubic variation of thickness coordinate in in-plane displacement fields of the present mathematical model, a 2D finite element (FE) model was developed including skew transformations in the mathematical model. No shear correction factor is required in the present formulation and damping effect was also incorporated. This is the first FE implementation considering a cubic variation of thickness coordinate in in-plane displacement fields including skew transformations to solve the forced vibration problem of composite skew plates. The effect of transverse shear and rotary inertia was incorporated in the present model. The Newmark-β scheme was adapted to perform time integration from step to step. The C0 FE formulation was implemented to overcome the problem of C1 continuity associated with the cubic variation of thickness coordinate in in-plane displacement fields. The numerical studies showed that the present 2D FE model predicts the result close to the analytical results. Many new results varying different parameter such as skew angles, boundary conditions, etc. were presented.