sagar kumar | Malaviya National Institute of Technology, Jaipur (original) (raw)

Papers by sagar kumar

International Journal of Current Microbiology and Applied Sciences, 2020

Cotton (Gossypium hirsutum L.) known as “The king of fibre” and the leading fibre crop of the Ind... more Cotton (Gossypium hirsutum L.) known as “The king of fibre” and the leading fibre crop of the India. Cotton is an important raw material for the Indian textile industry and an important cash crop of the country. The cotton crop also called „white gold‟ enjoys a premier position amongst all commercial crops in India. In India, the cotton productivity is very low as compared to other countries. But after the launching of "Technology Mission on Cotton" by Government of India in February 2000, the significant achievements have been made in increasing yield and productivity through development of high yielding varieties, better farm management practices, increased area under cultivation of Bt cotton hybrids. After introduction of transgenic Bt hybrid cotton in India, the productivity of cotton has increased substantially from 303 to 561 kg/ha within a span of seven years (Tayade et al., 2011). International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Vo...

Journal of Advanced Manufacturing Systems, 2018

This paper presents a systematic methodology to determine optimal injection molding conditions fo... more This paper presents a systematic methodology to determine optimal injection molding conditions for minimum warpage and shrinkage in a thin wall relay part using modified particle swarm optimization algorithm (MPSO). Polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) were injected in a thin wall relay component for different processing parameters: melt temperature, packing pressure and packing time. Further, Taguchi’s L9 (3[Formula: see text] orthogonal array is used for conducting simulation analysis to consider the interaction effects of the above parameters. A predictive mathematical model for shrinkage and warpage is developed in terms of the above process parameters using regression analysis. ANOVA analysis is performed to establish statistical significance within the injection molding parameters. The analytical model is further optimized using a newly developed MPSO algorithm and the process parameters values are predicted for minimizing shrinkage and warpage...

Measurement Science Review, 2017

This paper presents a modified particle swarm optimization (MPSO) algorithm for the evaluation of... more This paper presents a modified particle swarm optimization (MPSO) algorithm for the evaluation of geometric characteristics defining form and function of planar surfaces. The geometric features of planar surfaces are decomposed into four components; namely straightness, flatness, perpendicularity, and parallelism. A non-linear minimum zone objective function is formulated mathematically for each planar surface geometric characteristic. Finally, the result of the proposed method is compared with previous work on the same problem and with other nature inspired algorithms. The results demonstrate that the proposed MPSO algorithm is more efficient and accurate in comparison to other algorithms and is well suited for effective and accurate evaluation of planar surface characteristics.

In the present study, a systematic methodology has been presented to determine optimal injection ... more In the present study, a systematic methodology has been presented to determine optimal injection molding conditions for minimizing warpage and shrinkage in a thin wall relay part using modified particle swarm algorithm (MPSO). Polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) have been injected in thin wall relay component under different processing parameters: melt temperature, packing pressure and packing time. Further, Taguchi's L 9 (3 2) orthogonal array has been used for conducting simulation analysis to consider the interaction effects of the above parameters. A predictive mathematical model for shrinkage and warpage has been developed in terms of the above process parameters using regression model. ANOVA analysis has been performed to establish statistical significance among the injection molding parameters and the developed model. The developed model has been further optimized using a newly developed modified particle swarm optimization (MPSO) algorithm and the process parameters values have been obtained for minimized shrinkage and warpage. Furthermore, the predicted values of the shrinkage and warpage using MPSO algorithm have been reduced by approximately 30% as compared to the initial simulation values making more adequate parts.

International Journal of Advances in Materials Science and Engineering (IJAMSE)<... more International Journal of Advances in Materials Science and Engineering (IJAMSE) ISSN:2201-2311 http://wireilla.com/engg/ijamse/index.html Scope & Topics International Journal of Advances in Materials Science and Engineering (IJAMSE) is a quarterly open access peer-reviewed journal that publishes articles which contribute new results in all areas of the Materials Science and Engineering. The journal is devoted to the publication of high quality papers on theoretical and practical aspects of Materials Science and Engineering. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on Materials Science and Engineering advancements, and establishing new collaborations in these areas. Original research papers, state-of-the-art reviews are invited for publication in all areas of Materials Science and Engineering. Topics of interest include but are not limited to, the following Authors are solicited to contribute to the conference by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the following areas, but are not limited to ·Art Conservation Science ·Biomaterials, tissue engineering ·Ceramics ·Composites ·Corrosion ·Diffraction studies ·Energy ·Fracture of materials ·Magnetic Materials ·Materials for Electronics and Photonics ·Materials Synthesis & Processing ·Materials Theory, Computation, and Design ·Mechanical properties ·Metals and alloys ·Nanomaterials, Nano particulates and nanocomposites ·Polymers ·Self-Assembly ·Solar energy ·Surfaces and Interfaces Paper Submission Authors are invited to submit papers for this journal through the Submission System or ijamsejournal@wireilla.com.Submissions must be original and should not have been published previously or be under consideration for publication while being evaluated for this Journal. Important Dates <stro [...]

Sādhanā, 2020

This paper estimates the volumetric shrinkage for thermoplastic Polypropylene (PP) injection mold... more This paper estimates the volumetric shrinkage for thermoplastic Polypropylene (PP) injection molded components made using digital Acrylonitrile butadiene styrene (ABS) mold. The parameters affecting volumetric shrinkage for the digital ABS mold are mold temperature and injection temperature, cooling time, hold pressure and injecting speed. Therefore, twelve standard benchmark CAD model were selected with different geometric attributes. Subsequently, simulation analysis was performed on all CAD model using Moldflow® (MFA) simulation software. Additionally, regression analysis is applied to identify the effect of injection molding parameters on the volumetric shrinkage of part made using rapid tooling mold insert of digital ABS material. It is found that maximum volumetric shrinkage (18.75%) is observed for square pyramid frustum, conical frustum, and solid torus. On the contrary, hollow rectangular prism shows minimum shrinkage effect having 12.61% of volumetric shrinkage. This study predicted that shrinkage is the main concern for these three geometric features (i.e., square pyramid frustum, conical frustum, and solid torus) and must be looked for its minimization. The results are experimentally validated, with 3D scanner integrated with COMET plus and Inspect plus softwares. Since shrinkage estimation for digital ABS mold using Rapid Tooling technique has not been attempted before, therefore, this study provides guidance for the optimum parameter selection and assigning suitable shrinkage compensation values for digital ABS mold made using direct rapid tooling.

International Journal of Advances in Materials Science and Engineering, 2018

Applied Nanoscience, 2020

International Journal of Advances in Materials Science and Engineering, 2016

This study investigates the effect of static load and sliding speed on wear resistance of 0.58% E... more This study investigates the effect of static load and sliding speed on wear resistance of 0.58% EN8 carbon steel which comes under the class of medium carbon steel. Experiments are performed under unlubricated conditions in moist air on pin on disk type wear apparatus. In this study, three levels of static load and sliding speed were used for conducting experiments. The results shows that wear increases with increasing the load and sliding speed. Average values of wear are considered for both parameters. In this condition, the effect of load shows greater influence on wear as compared to sliding speed which can result in degradation of material at faster rate than normal condition.

International Journal of Advances in Materials Science and Engineering (IJAMSE), 2018

Rapid Prototyping is being accepted globally by industries for its potential in saving on process... more Rapid Prototyping is being accepted globally by industries for its potential in saving on process time and cost. Rapid Tooling helps Rapid Prototyping grow beyond its conventional Feel & Fit status to Feel Fit Function status and is increasingly becoming popular. However, potential of rapid prototyping for normal production run is still not being realized. In that situation Rapid Tooling becomes a viable alternative. The greatest opportunity for rapid tooling implementation is the use of Additive Manufacturing (AM) technology. Further, polymer based direct rapid tooling provide large cost reduction and can also be readily accessible by industries. With the advances in materials along with the new access and low cost plastic based-AM equipment, direct use Polymer Rapid Tools (PRTs) would be a far more advantageous option in creating injection molds for low and highly flexible production. However, the use of polymer based direct rapid tooling by industries is curtailed due to the issu...

International Journal of Advances in Materials Science and Engineering (IJAMSE), 2018

Object detection, is an important element of various computer vision areas, such as image retriev... more Object detection, is an important element of various computer vision areas, such as image retrieval, shot detection, video surveillance, etc. which require automatic segmentation or location of regions of interest in images which can be further analyzed by more computationally demanding techniques to produce a correct interpretation. This paper explores the possibility of performing this task of object detection in any general environment using the intensity pattern information in individual channels of YCbCr Color space. It was observed that prominent objects could be easily and efficiently detected by the algorithm irrespective of the environment they are kept in. The efficiency of the algorithm boasts the possibilities of further simplistic models for the invigorating task as of image detection for complicated computer vision applications.

Journal of Indian Society of Pedodontics and Preventive Dentistry, 2010

We present a case of 10 year-old boy with oropharyngeal injury caused by a toothbrush which penet... more We present a case of 10 year-old boy with oropharyngeal injury caused by a toothbrush which penetrated the parapharyngeal space. Initial examination revealed broken end of the toothbrush in oral cavity with the head of the toothbrush having bristles, beyond the soft palate. Tongue and palate were lacerated and there were blood and oral secretions in the oral cavity. Patient was having bradycardia. Computed tomography (CT) scan showed the toothbrush head near the carotid artery, the carotid being laterally displaced. The foreign body was surgically removed without any intraoperative or postoperative complications.

Reduction in plastic injection molding cycle time and increase in part quality are two goals that... more Reduction in plastic injection molding cycle time and increase in part quality are two goals that are not usually thought of as being compatible. Conformal cooling channels are one of the technologies that will help achieve both goals. Cooling time is the only phase of the injection molding cycle that has significant time to reduce. Reduction in cooling time usually results in parts with hotter temperatures. This could result in increased part shrinkage and warpage. The key to cycle time reduction and better quality is to cool the parts uniformly and more quickly.

International Journal of Current Microbiology and Applied Sciences, 2020

Journal of Advanced Manufacturing Systems, 2018

Measurement Science Review, 2017

Sādhanā, 2020

International Journal of Advances in Materials Science and Engineering, 2018

Applied Nanoscience, 2020

International Journal of Advances in Materials Science and Engineering, 2016

International Journal of Advances in Materials Science and Engineering (IJAMSE), 2018

Journal of Indian Society of Pedodontics and Preventive Dentistry, 2010