Hemant Gupta - Academia.edu (original) (raw)
Papers by Hemant Gupta
Case Studies in Thermal Engineering, 2015
The efficiency of conventional tube-in-plate type solar collectors is limited due to higher heat ... more The efficiency of conventional tube-in-plate type solar collectors is limited due to higher heat losses for surface based solar energy absorption and indirect transfer of heat from hot absorber surface to working fluid having poor heat transfer properties flowing through tubes. In this paper, a prototype direct absorption solar collector having gross area 1.4 m 2 working on volumetric absorption principle is developed to investigate the effect of using Al 2 O 3 -H 2 O nanofluid as heat transfer fluid at different flow rates. Experimentation was carried using distilled water and 0.005% volume fractions of 20 nm size Al 2 O 3 nanoparticles at three flow rates of 1.5, 2 and 2.5 lpm. ASHRAE standard 93-86 was followed for calculation of instantaneous efficiency of solar collector. Use of nanofluid improves the optical and thermo physical properties that result into an increase in the efficiency of the collector in all cases of using nanofluids in place of water. Collector efficiency enhancement of 8.1% and 4.2% has been observed for 1.5 and 2 lpm flow rate of nanofluid respectively. Optimum flow rate of 2.5 and 2 lpm towards maximum collector efficiency have also been observed for water and nanofluid respectively.
International Conference on Recent Advances and Innovations in Engineering (ICRAIE-2014), 2014
International Journal of Engineering & Technology, 2012
Abstract─ The purpose of this paper is to design a yagi-uda antenna at 1 GHz. The designing formu... more Abstract─ The purpose of this paper is to design a yagi-uda antenna at 1 GHz. The designing formulas and structure were discussed. The antenna characteristics like return loss with different liquids are filled in the all the yagi elements were also discussed in this ...
Materials Science and Engineering B-advanced Functional Solid-state Materials, 1995
The kinetics of formation of nanocrystalline chromium silicide and silicon carbide composites fro... more The kinetics of formation of nanocrystalline chromium silicide and silicon carbide composites from homogeneous amorphous precursor powders has been investigated. This study was conducted in a dynamic argon atmosphere at 1 atm in the temperature range 900–1300 °C for time periods ranging from 3 min to 62 h. Two precursors with different concentration ratios of Cr, Si and C were examined. The phase percentages of the final composites, (1) hexagonal Cr5Si3CX and cubic β-SiC and (2) tetragonal Cr5Si3 and cubic β-SiC, vs. temperature and time were determined using X-ray diffraction. The relationship between the phase percentages of the crystalline material, the processing temperature and time follow the Avrami-Erofe'ev equation (J.D. Verhoeven, Fundamentals of Physical Metallurgy, Wiley, 1975). The activation energies have also been determined, and the formation of nanocrystalline chromium silicide and silicon carbide has been discussed.
Forests are important due to their environmental functions (wildlife refuge, watershed protection... more Forests are important due to their environmental functions (wildlife refuge, watershed protection, prevention of soil and water runoff, and groundwater recharge) and country like India for their subsistence function as fuel-wood, food fodder, and source of income for 100 million forest dwellers as these are particularly sensitive to deforestation. India has experienced three policy phases since its independence that is
Small-scale Forestry, 2007
A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Him... more A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Himalaya, to investigate the perceptions of Indian foresters about aspects of forest management relevant for effective Joint Forest Management (JFM). A lack of uniform understanding was found amongst forestry staff about almost all the studied issues pertaining to JFM. A need is identified to emphasise social aspects in the training of the foresters (including in-service training), along with the existing silvi-technical aspects. For JFM success, measures need to be devised to reduce the political interference in JFM, reduce hierarchical rigidity, and increase interaction between field staff and the administrative hierarchy. Strategies should be devised to make JFM participants as well as forestry staff equally responsible to honour their commitments with respect to JFM.
International Journal of Neuroscience, 2001
This study tested the prediction that reading Vedic Sanskrit texts, without knowledge of their me... more This study tested the prediction that reading Vedic Sanskrit texts, without knowledge of their meaning, produces a distinct physiological state. We measured EEG, breath rate, heart rate, and skin conductance during: (1) 15-min Transcendental Meditation (TM) practice; (2) 15-min reading verses of the Bhagavad Gita in Sanskrit; and (3) 15-min reading the same verses translated in German, Spanish, or French. The two reading conditions were randomly counterbalanced, and subjects filled out experience forms between each block to reduce carryover effects. Skin conductance levels significantly decreased during both reading Sanskrit and TM practice, and increased slightly during reading a modern language. Alpha power and coherence were significantly higher when reading Sanskrit and during TM practice, compared to reading modern languages. Similar physiological patterns when reading Sanskrit and during practice of the TM technique suggests that the state gained during TM practice may be integrated with active mental processes by reading Sanskrit.
International Journal of Electronics and Electrical Engineering, 2013
International Journal of Engineering & Technology, 2012
ABSTRACT
Journal of Computational Intelligence and Electronic Systems, 2012
ABSTRACT
International Journal of Electronics and Electrical Engineering, 2013
International Journal of Engineering & Technology, 2012
This paper describes a design of Microstrip Planar five-element yagi-uda antenna for 2.4 GHz band... more This paper describes a design of Microstrip Planar five-element yagi-uda antenna for 2.4 GHz band.The structure has been optimized for a maximum front-to-back ratio by CST Simulation software. Special feature of the antenna are reflector formed by ground plane edge and solution of impedance summarization and matching. Antenna has been realized simulated result.
International Journal of Engineering & Technology, 2012
ABSTRACT
International Journal of Electronics and Electrical Engineering, 2014
Small-scale Forestry, 2007
A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Him... more A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Himalaya, to investigate the perceptions of Indian foresters about aspects of forest management relevant for effective Joint Forest Management (JFM). A lack of uniform understanding was found amongst forestry staff about almost all the studied issues pertaining to JFM. A need is identified to emphasise social aspects in the training of the foresters (including in-service training), along with the existing silvi-technical aspects. For JFM success, measures need to be devised to reduce the political interference in JFM, reduce hierarchical rigidity, and increase interaction between field staff and the administrative hierarchy. Strategies should be devised to make JFM participants as well as forestry staff equally responsible to honour their commitments with respect to JFM.
Scripta Metallurgica Et Materialia, 1995
The determination of weight fraction of various phases in an alloy or composite is extremely impo... more The determination of weight fraction of various phases in an alloy or composite is extremely important in order to have a better control over the properties. Quantitative metallography and x-ray diffraction have been traditionally in use for this purpose. These methods have their merits as well as limitations. A simple method of determining the weight fraction of a phase has
Journal of Oral Biology and Craniofacial Research, 2012
Oral submucous fibrosis (OSMF), a chronic debilitating condition of the mouth, has been treated b... more Oral submucous fibrosis (OSMF), a chronic debilitating condition of the mouth, has been treated both surgically and non-surgically, but non-surgical methods yield inconsistent results. The surgical methods essentially comprise of bilateral sectioning of fibrous bands with or without coronoidectomy followed by covering of the surgical defect with a graft or a wound dressing material such as collagen sheet. This study comprised 30 clinically diagnosed cases of OSMF. This study compared transposition of buccal pad fat graft with collagen sheet to cover the defect within the following parameters: pain, swelling, mouth opening, color of mucosa, palpability of fibrous bands, and suppleness of mucosa. We found significant difference in the postoperative mouth opening, an insignificant difference for post surgical morbidity and higher grades of surgical convenience in using collagen sheet as a wound dressing material. Collagen membrane is a superior method compared to transposition of the buccal pad of fat as a graft to cover the surgical wound in the treatment of OSMF of grade III and above.
Journal of Oral Biology and Craniofacial Research, 2011
Bone grafts are frequently used for the treatment of bone defects, but can cause postoperative co... more Bone grafts are frequently used for the treatment of bone defects, but can cause postoperative complications, and sometimes a sufficient quantity of bone is not available. Hence, synthetic biomaterials have been used as an alternative to autogenous bone grafts. Recent clinical reports suggest that application of autologous blood plasma enriched with platelets can enhance the formation of new bone. There are very few in vitro or in vivo studies published on the efficiency of platelet-rich plasma (PRP). The objective of this study was to evaluate the alloplastic bone substitute for its osteogenic potential with or without PRP. Twenty-three patients with periapical bony defects were selected for this study. Clinical parameters such as pain visual analog scale (VAS), swelling, infection, graft migration, rejection, radiographical interpretations at regular interval and scintigraphic evaluation were done to evaluate osteogenic potential of alloplastic bone substitute with or without PRP. The highest acceleration in bone formation was observed in groups where alloplastic bone substitute was used with PRP. There were no statistically significant differences between the two groups regarding other outcome variables throughout the postoperative period. Addition of PRP significantly accelerates vascularization of the graft, improves soft tissue healing, reduces postoperative morbidity and enhances bone regeneration.
Plastic Surgery International, 2012
Mandible is the second most common facial fracture. There has been a significant increase in the ... more Mandible is the second most common facial fracture. There has been a significant increase in the number of cases in recent years with the advent of fast moving automobiles. Mandibular fractures constitute a substantial proportion of maxillofacial trauma cases in Lucknow. This study was undertaken to study mandibular fractures clinicoradiologically with an aim to calculate incidence and study pattern and the commonest site of fractures in population in and around Lucknow. Patient presenting with history of trauma at various centers of maxillofacial surgery in and around Lucknow were included in this study. Detailed case history was recorded followed by thorough clinical examination, and radiological interpretation was done for establishing the diagnosis and the data obtained was analyzed statistically. Out of 66 patients with mandibular fractures, highest percentage was found in 21-30 years of age with male predominance. Road traffic accidents were the most common cause of fracture with parasymphysis being commonest site. Commonest combination was parasymphysis with subcondyle. There was no gender bias in etiology with number of fracture sites. The incidence and causes of mandibular fracture reflect trauma patterns within the community and can provide a guide to the design of programs geared toward prevention and treatment.
Craniomaxillofacial Trauma and Reconstruction, 2013
Osteomyelitis is an inflammatory disease of the bone that usually begins as an infection of the m... more Osteomyelitis is an inflammatory disease of the bone that usually begins as an infection of the medullary cavity, rapidly involves the haversian system, and quickly extends to the periosteum of the area. It develops in the jaws after a chronic odontogenic infection or for a variety of other reasons such as trauma, inadequate treatment of fracture, or irradiation to the mandible. When antimicrobial agents or drainage prove unsuccessful, acute osteomyelitis may become chronic. Conventional radiography, culture, bone biopsy, radioisotope bone scan, laser Doppler flowmetry, computed tomography, and magnetic resonance imaging are used for its diagnosis. We present a case of chronic suppurative osteomyelitis associated with a draining extraoral sinus, which was successfully treated with surgical debridement and stabilization with a 10-hole reconstruction plate and bicortical screws using AO principles.
Case Studies in Thermal Engineering, 2015
The efficiency of conventional tube-in-plate type solar collectors is limited due to higher heat ... more The efficiency of conventional tube-in-plate type solar collectors is limited due to higher heat losses for surface based solar energy absorption and indirect transfer of heat from hot absorber surface to working fluid having poor heat transfer properties flowing through tubes. In this paper, a prototype direct absorption solar collector having gross area 1.4 m 2 working on volumetric absorption principle is developed to investigate the effect of using Al 2 O 3 -H 2 O nanofluid as heat transfer fluid at different flow rates. Experimentation was carried using distilled water and 0.005% volume fractions of 20 nm size Al 2 O 3 nanoparticles at three flow rates of 1.5, 2 and 2.5 lpm. ASHRAE standard 93-86 was followed for calculation of instantaneous efficiency of solar collector. Use of nanofluid improves the optical and thermo physical properties that result into an increase in the efficiency of the collector in all cases of using nanofluids in place of water. Collector efficiency enhancement of 8.1% and 4.2% has been observed for 1.5 and 2 lpm flow rate of nanofluid respectively. Optimum flow rate of 2.5 and 2 lpm towards maximum collector efficiency have also been observed for water and nanofluid respectively.
International Conference on Recent Advances and Innovations in Engineering (ICRAIE-2014), 2014
International Journal of Engineering & Technology, 2012
Abstract─ The purpose of this paper is to design a yagi-uda antenna at 1 GHz. The designing formu... more Abstract─ The purpose of this paper is to design a yagi-uda antenna at 1 GHz. The designing formulas and structure were discussed. The antenna characteristics like return loss with different liquids are filled in the all the yagi elements were also discussed in this ...
Materials Science and Engineering B-advanced Functional Solid-state Materials, 1995
The kinetics of formation of nanocrystalline chromium silicide and silicon carbide composites fro... more The kinetics of formation of nanocrystalline chromium silicide and silicon carbide composites from homogeneous amorphous precursor powders has been investigated. This study was conducted in a dynamic argon atmosphere at 1 atm in the temperature range 900–1300 °C for time periods ranging from 3 min to 62 h. Two precursors with different concentration ratios of Cr, Si and C were examined. The phase percentages of the final composites, (1) hexagonal Cr5Si3CX and cubic β-SiC and (2) tetragonal Cr5Si3 and cubic β-SiC, vs. temperature and time were determined using X-ray diffraction. The relationship between the phase percentages of the crystalline material, the processing temperature and time follow the Avrami-Erofe'ev equation (J.D. Verhoeven, Fundamentals of Physical Metallurgy, Wiley, 1975). The activation energies have also been determined, and the formation of nanocrystalline chromium silicide and silicon carbide has been discussed.
Forests are important due to their environmental functions (wildlife refuge, watershed protection... more Forests are important due to their environmental functions (wildlife refuge, watershed protection, prevention of soil and water runoff, and groundwater recharge) and country like India for their subsistence function as fuel-wood, food fodder, and source of income for 100 million forest dwellers as these are particularly sensitive to deforestation. India has experienced three policy phases since its independence that is
Small-scale Forestry, 2007
A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Him... more A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Himalaya, to investigate the perceptions of Indian foresters about aspects of forest management relevant for effective Joint Forest Management (JFM). A lack of uniform understanding was found amongst forestry staff about almost all the studied issues pertaining to JFM. A need is identified to emphasise social aspects in the training of the foresters (including in-service training), along with the existing silvi-technical aspects. For JFM success, measures need to be devised to reduce the political interference in JFM, reduce hierarchical rigidity, and increase interaction between field staff and the administrative hierarchy. Strategies should be devised to make JFM participants as well as forestry staff equally responsible to honour their commitments with respect to JFM.
International Journal of Neuroscience, 2001
This study tested the prediction that reading Vedic Sanskrit texts, without knowledge of their me... more This study tested the prediction that reading Vedic Sanskrit texts, without knowledge of their meaning, produces a distinct physiological state. We measured EEG, breath rate, heart rate, and skin conductance during: (1) 15-min Transcendental Meditation (TM) practice; (2) 15-min reading verses of the Bhagavad Gita in Sanskrit; and (3) 15-min reading the same verses translated in German, Spanish, or French. The two reading conditions were randomly counterbalanced, and subjects filled out experience forms between each block to reduce carryover effects. Skin conductance levels significantly decreased during both reading Sanskrit and TM practice, and increased slightly during reading a modern language. Alpha power and coherence were significantly higher when reading Sanskrit and during TM practice, compared to reading modern languages. Similar physiological patterns when reading Sanskrit and during practice of the TM technique suggests that the state gained during TM practice may be integrated with active mental processes by reading Sanskrit.
International Journal of Electronics and Electrical Engineering, 2013
International Journal of Engineering & Technology, 2012
ABSTRACT
Journal of Computational Intelligence and Electronic Systems, 2012
ABSTRACT
International Journal of Electronics and Electrical Engineering, 2013
International Journal of Engineering & Technology, 2012
This paper describes a design of Microstrip Planar five-element yagi-uda antenna for 2.4 GHz band... more This paper describes a design of Microstrip Planar five-element yagi-uda antenna for 2.4 GHz band.The structure has been optimized for a maximum front-to-back ratio by CST Simulation software. Special feature of the antenna are reflector formed by ground plane edge and solution of impedance summarization and matching. Antenna has been realized simulated result.
International Journal of Engineering & Technology, 2012
ABSTRACT
International Journal of Electronics and Electrical Engineering, 2014
Small-scale Forestry, 2007
A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Him... more A study was conducted in Kullu district in the province of Himachal Pradesh in Indian Western Himalaya, to investigate the perceptions of Indian foresters about aspects of forest management relevant for effective Joint Forest Management (JFM). A lack of uniform understanding was found amongst forestry staff about almost all the studied issues pertaining to JFM. A need is identified to emphasise social aspects in the training of the foresters (including in-service training), along with the existing silvi-technical aspects. For JFM success, measures need to be devised to reduce the political interference in JFM, reduce hierarchical rigidity, and increase interaction between field staff and the administrative hierarchy. Strategies should be devised to make JFM participants as well as forestry staff equally responsible to honour their commitments with respect to JFM.
Scripta Metallurgica Et Materialia, 1995
The determination of weight fraction of various phases in an alloy or composite is extremely impo... more The determination of weight fraction of various phases in an alloy or composite is extremely important in order to have a better control over the properties. Quantitative metallography and x-ray diffraction have been traditionally in use for this purpose. These methods have their merits as well as limitations. A simple method of determining the weight fraction of a phase has
Journal of Oral Biology and Craniofacial Research, 2012
Oral submucous fibrosis (OSMF), a chronic debilitating condition of the mouth, has been treated b... more Oral submucous fibrosis (OSMF), a chronic debilitating condition of the mouth, has been treated both surgically and non-surgically, but non-surgical methods yield inconsistent results. The surgical methods essentially comprise of bilateral sectioning of fibrous bands with or without coronoidectomy followed by covering of the surgical defect with a graft or a wound dressing material such as collagen sheet. This study comprised 30 clinically diagnosed cases of OSMF. This study compared transposition of buccal pad fat graft with collagen sheet to cover the defect within the following parameters: pain, swelling, mouth opening, color of mucosa, palpability of fibrous bands, and suppleness of mucosa. We found significant difference in the postoperative mouth opening, an insignificant difference for post surgical morbidity and higher grades of surgical convenience in using collagen sheet as a wound dressing material. Collagen membrane is a superior method compared to transposition of the buccal pad of fat as a graft to cover the surgical wound in the treatment of OSMF of grade III and above.
Journal of Oral Biology and Craniofacial Research, 2011
Bone grafts are frequently used for the treatment of bone defects, but can cause postoperative co... more Bone grafts are frequently used for the treatment of bone defects, but can cause postoperative complications, and sometimes a sufficient quantity of bone is not available. Hence, synthetic biomaterials have been used as an alternative to autogenous bone grafts. Recent clinical reports suggest that application of autologous blood plasma enriched with platelets can enhance the formation of new bone. There are very few in vitro or in vivo studies published on the efficiency of platelet-rich plasma (PRP). The objective of this study was to evaluate the alloplastic bone substitute for its osteogenic potential with or without PRP. Twenty-three patients with periapical bony defects were selected for this study. Clinical parameters such as pain visual analog scale (VAS), swelling, infection, graft migration, rejection, radiographical interpretations at regular interval and scintigraphic evaluation were done to evaluate osteogenic potential of alloplastic bone substitute with or without PRP. The highest acceleration in bone formation was observed in groups where alloplastic bone substitute was used with PRP. There were no statistically significant differences between the two groups regarding other outcome variables throughout the postoperative period. Addition of PRP significantly accelerates vascularization of the graft, improves soft tissue healing, reduces postoperative morbidity and enhances bone regeneration.
Plastic Surgery International, 2012
Mandible is the second most common facial fracture. There has been a significant increase in the ... more Mandible is the second most common facial fracture. There has been a significant increase in the number of cases in recent years with the advent of fast moving automobiles. Mandibular fractures constitute a substantial proportion of maxillofacial trauma cases in Lucknow. This study was undertaken to study mandibular fractures clinicoradiologically with an aim to calculate incidence and study pattern and the commonest site of fractures in population in and around Lucknow. Patient presenting with history of trauma at various centers of maxillofacial surgery in and around Lucknow were included in this study. Detailed case history was recorded followed by thorough clinical examination, and radiological interpretation was done for establishing the diagnosis and the data obtained was analyzed statistically. Out of 66 patients with mandibular fractures, highest percentage was found in 21-30 years of age with male predominance. Road traffic accidents were the most common cause of fracture with parasymphysis being commonest site. Commonest combination was parasymphysis with subcondyle. There was no gender bias in etiology with number of fracture sites. The incidence and causes of mandibular fracture reflect trauma patterns within the community and can provide a guide to the design of programs geared toward prevention and treatment.
Craniomaxillofacial Trauma and Reconstruction, 2013
Osteomyelitis is an inflammatory disease of the bone that usually begins as an infection of the m... more Osteomyelitis is an inflammatory disease of the bone that usually begins as an infection of the medullary cavity, rapidly involves the haversian system, and quickly extends to the periosteum of the area. It develops in the jaws after a chronic odontogenic infection or for a variety of other reasons such as trauma, inadequate treatment of fracture, or irradiation to the mandible. When antimicrobial agents or drainage prove unsuccessful, acute osteomyelitis may become chronic. Conventional radiography, culture, bone biopsy, radioisotope bone scan, laser Doppler flowmetry, computed tomography, and magnetic resonance imaging are used for its diagnosis. We present a case of chronic suppurative osteomyelitis associated with a draining extraoral sinus, which was successfully treated with surgical debridement and stabilization with a 10-hole reconstruction plate and bicortical screws using AO principles.