Pradeep Hegde - Academia.edu (original) (raw)

Papers by Pradeep Hegde

Research paper thumbnail of Titanium silicate molecular sieve (TS1) induced catalytic cleavage of tosylhydrazones

Journal of The Chemical Society, Chemical Communications, 1993

... Pradeep Kumar, Vishnumurthy R. Hegde, Bipin Pandey and T. Ravindranathan" National Chemi... more ... Pradeep Kumar, Vishnumurthy R. Hegde, Bipin Pandey and T. Ravindranathan" National Chemical Laboratory, Pune-4 I 1008, India ... We also thank Dr Rajiv Kumar and Dr A. P. Singh of the Catalysis Division for discussion and for providing the catalyst. ... 12 RG Pews, J. Org. ...

Research paper thumbnail of Accidental Dextropropoxyphene poisoning

Indian Journal of Pediatrics, 2003

Dextropropoxyphene poisoning is an uncommon accidental poisoning in children. Presentation is sim... more Dextropropoxyphene poisoning is an uncommon accidental poisoning in children. Presentation is similar to narcotic over dosage or poisoning. Convulsions, conduction disturbances, arrhythmias and hypoglycemia are common. Naloxone is the antidote. As it is uncommon and not documented in children in Indian literature we are reporting this case.

Research paper thumbnail of Design and fabrication of an indigenous molecular beam ultraviolet photoelectron spectrometer

Journal of Chemical Sciences, 1991

An ultraviolet photoelectron spectrometer for the study of van der Waals molecules has been desig... more An ultraviolet photoelectron spectrometer for the study of van der Waals molecules has been designed and fabricated indigenously. The spectrometer consists of an Hel discharge lamp, a molecular beam sample inlet system, an electrostatic lens, a 180° hemispherical electrostatic analyser and a channeltron detector. Performance of the spectrometer is illustrated with an example.

Research paper thumbnail of Ultraviolet photoelectron spectroscopy of the hydrogen bonded heterodimer H2S...HCl

Spectrochimica Acta Part A: Molecular Spectroscopy, 1992

The He1 photoelectron spectrum of the hydrogen bonded hetero-dimer H& . .HCI shows two vertical i... more The He1 photoelectron spectrum of the hydrogen bonded hetero-dimer H& . .HCI shows two vertical ionization energies at 10.91 and 12.16 eV. Ab initio MO calculations reveal that these features are due to the sulphur and chlorine lone pair ionizations respectively. Results show that while the ground ionic state is repulsive the first excited ionic state is strongly bound. The photoelectron spectrum of the diethyl sulphide. . .HCI complex is similar to that of H$+ . .HCI

Research paper thumbnail of SERICSAT

International Journal of Hospitality & Tourism Administration, 2007

In the first part of the present paper, a preliminary instrument is developed to measure the sati... more In the first part of the present paper, a preliminary instrument is developed to measure the satisfaction customers experience as an outcome of the perceived fairness of the service recovery process. Towards this end, the concept of justice with its three dimensions, that is, procedural justice, interaction justice, and distributive justice, is modeled after the expectation-performance paradigm of customer satisfaction, resulting in the service recovery satisfaction scale, SERICSAT. The validity and reliability of the scale has been established for tourism and allied services. Later, the scale is employed to examine a proposition related to the effect of tourist satisfaction with particular service recovery situations upon future complaint behavior. It is posited that satisfactory complaint redressal associated with a tourist service has the effect of reinforcing the propensity not only to repurchase that service but also to complain about it in the future.

Research paper thumbnail of Photoelectron spectrum of the Xe . . . HCl van der Waals molecule

Research paper thumbnail of Photoelectron spectrum of the Xe⋅⋅⋅HCl van der Waals molecule

Research paper thumbnail of Knowledge of dental trauma among mothers in Mangalore: Knowledge of dental trauma among mothers in Mangalore

Dental Traumatology, 2010

Abstract – Aim: The aim of this study was to assess the knowledge of Mangalore mothers regarding ... more Abstract – Aim: The aim of this study was to assess the knowledge of Mangalore mothers regarding dental trauma. Methods: A questionnaire inquiring about mother’s knowledge on dental trauma was distributed to 500 working and non-working mothers via their children attending two primary schools in the Mangalore city. Results: Around 68.5% of the mothers were aware of the management of dental trauma. Of the working mothers, 72% were aware of the management of dental trauma while 65% of the non-working mothers were aware. When asked about saving the avulsed tooth, 36% of mothers said that the avulsed tooth can be saved. Regarding mouth guards, 54.5% of the mothers said that they aware of the use of mouth guards to prevent traumatic injuries to the teeth. Of the working mothers 72% knew that mouth guards are useful in the prevention of dental trauma while 37% of the non-working mothers have this knowledge; 68% of the mothers would take the child to the dentist following tooth injury whereas 17% of the mothers would use an emergency kit. Chi-square test and logistic regression analysis indicated a significant difference between the responses of working and the non-working mothers with regard to mouth guard knowledge and recommendation (P-value 0.001). Conclusion: Most of the mothers were graduates and were aware of the emergency management of dental trauma. The working mothers had better knowledge and awareness regarding mouth guards (72%) when compared with non-working mothers (37%).

Research paper thumbnail of Vortical waves incident on junctions between different wave-bearing media

We present a solution to a receptivity-type problem whereby a TS wave or other vortical wave prop... more We present a solution to a receptivity-type problem whereby a TS wave or other vortical wave propagating along a plane Poiseuille flow is incident on a junction between a rigid and compliant wall. Depending on whether the upstream wall is rigid or compliant there can be both transmitted and reflected waves. We show that the incident wave creates a virtual wave-driver. The problem then reduces to determining the strength of the driver in terms of the incident wave amplitude from which the amplitudes of the reflected and transmitted waves can then be determined. A high-Reynolds-number asymptotic theory combined with the use of adjoint eigenmodes is developed to solve this problem. We believe that the main features of this theory are generic for all vortical waves.

Research paper thumbnail of An ultraviolet photoelectron spectroscopic study of the hydrogen bonded dimers of methanol, ethanol, and dimethylamine in the vapor phase

Journal of Molecular Spectroscopy, 1991

... Tokhadze,J. Mol. Struct. 219 (1990) 203. [6] JA. Odutola, R. Viswanathan and TR Dyke, J. Am. ... more ... Tokhadze,J. Mol. Struct. 219 (1990) 203. [6] JA. Odutola, R. Viswanathan and TR Dyke, J. Am. Chem. Soc. 101 (1979)4787. ... Phys. 84 (1986) 1653. 110] iV. Ortiz, Chem. Phys. Letters 134 (1987) 366. [Il] T. Pradeep, MS. Hegde and CNR Rao, J. Chem. Phys. 94 (1991) 4680. ...

Research paper thumbnail of Numerical Analysis of Multistack Microchannel Heat Sinks Cooled by Boiling Two Phase Flow

Microchannel heat sinks are widely regarded as being amongst the most effective heat removal tech... more Microchannel heat sinks are widely regarded as being amongst the most effective heat removal techniques from the space constrained electronic devices. Boiling flow cooled MicroChannel heat sinks have several advantages such as better cooling capability due to higher heat transfer coefficients, ability to handle ultra large heat loads and low coolant inventory requirements. In the present work multi- stack microchannel heat sinks cooled by boiling two phase flow are studied to obtain improved thermal and hydraulic performances. Rectangular cross section multi-stack microchannel heat sinks (with hydraulic diameters of the order of 200 mum) cooled by boiling flow of water are analyzed using the finite element method. A unique twelve noded, repetitive finite element representing a pair of adjacent microchannels is used for the finite element modeling of the microchannel heat sinks. The analysis yields the base temperature distribution, thermal resistance and pressure drop for multi-stack as well as single stack microchannel heat sinks.

Research paper thumbnail of Thermal analysis of single layer counter flow heat sinks with two phase flow

Pm&r, 2004

The thermal performance of single layer counter-flow (SLCF) microchannel heat sinks with two-phas... more The thermal performance of single layer counter-flow (SLCF) microchannel heat sinks with two-phase flow have been analyzed using the finite element method. Parameters such as the thermal resistance, pressure drop and the temperature distribution in SLCF heat sinks with two-phase flow have been determined and compared with those for the single layer parallel flow (SLPF) heat sinks with two-phase flow. It is observed that two-phase flow in the micro-channel heat sinks generally yield low thermal resistance and better temperature uniformity in the stream-wise direction. It is also observed that the thermal performance of the SLCF microchannel heat sinks are better especially at higher base heat fluxes compared to the SLPF heat sinks working under similar conditions

Research paper thumbnail of Thermal analysis of micro-channel heat exchangers with two-phase flow using FEM

International Journal of Numerical Methods for Heat & Fluid Flow, 2005

Abstract:< B> Purpose</B>-To analyze two-phase flow in micro-channel ... more Abstract:< B> Purpose</B>-To analyze two-phase flow in micro-channel heat exchangers used for high flux micro-electronics cooling and to obtain performance parameters such as thermal resistance, pressure drop, etc. Both uniform and non-uniform micro-channel base ...

Research paper thumbnail of Effects of non-uniform base heating in multi stack microchannel heat sinks used for cooling high heat flux electronic chips and devices

Microchannel heat sinks are widely regarded as being amongst the most effective heat removal tech... more Microchannel heat sinks are widely regarded as being amongst the most effective heat removal techniques from the space constrained electronic devices. Electronic components and chips are often subjected to spatially varying heat fluxes and hot spots in certain regions. In the present work, effects of non-uniform base heating on the performance of stacked microchannel heat sinks cooled by forced circulated water is analyzed. Finite element method is used for the analysis wherein a self developed 12 noded element is used for channel discretization. Different types of non-uniform base heating such as non-uniform heating in the ascending and descending orders with respect to the coolant flow direction in the bottom channel, upstream half heating, downstream half heating and center half heating (similar to central hotspot) are analyzed for both parallel flow and counter flow models. The results are compared with the case of uniform heating throughout the base.

Research paper thumbnail of Titanium silicate molecular sieve (TS1) induced catalytic cleavage of tosylhydrazones

Journal of The Chemical Society, Chemical Communications, 1993

... Pradeep Kumar, Vishnumurthy R. Hegde, Bipin Pandey and T. Ravindranathan" National Chemi... more ... Pradeep Kumar, Vishnumurthy R. Hegde, Bipin Pandey and T. Ravindranathan" National Chemical Laboratory, Pune-4 I 1008, India ... We also thank Dr Rajiv Kumar and Dr A. P. Singh of the Catalysis Division for discussion and for providing the catalyst. ... 12 RG Pews, J. Org. ...

Research paper thumbnail of Accidental Dextropropoxyphene poisoning

Indian Journal of Pediatrics, 2003

Dextropropoxyphene poisoning is an uncommon accidental poisoning in children. Presentation is sim... more Dextropropoxyphene poisoning is an uncommon accidental poisoning in children. Presentation is similar to narcotic over dosage or poisoning. Convulsions, conduction disturbances, arrhythmias and hypoglycemia are common. Naloxone is the antidote. As it is uncommon and not documented in children in Indian literature we are reporting this case.

Research paper thumbnail of Design and fabrication of an indigenous molecular beam ultraviolet photoelectron spectrometer

Journal of Chemical Sciences, 1991

An ultraviolet photoelectron spectrometer for the study of van der Waals molecules has been desig... more An ultraviolet photoelectron spectrometer for the study of van der Waals molecules has been designed and fabricated indigenously. The spectrometer consists of an Hel discharge lamp, a molecular beam sample inlet system, an electrostatic lens, a 180° hemispherical electrostatic analyser and a channeltron detector. Performance of the spectrometer is illustrated with an example.

Research paper thumbnail of Ultraviolet photoelectron spectroscopy of the hydrogen bonded heterodimer H2S...HCl

Spectrochimica Acta Part A: Molecular Spectroscopy, 1992

The He1 photoelectron spectrum of the hydrogen bonded hetero-dimer H& . .HCI shows two vertical i... more The He1 photoelectron spectrum of the hydrogen bonded hetero-dimer H& . .HCI shows two vertical ionization energies at 10.91 and 12.16 eV. Ab initio MO calculations reveal that these features are due to the sulphur and chlorine lone pair ionizations respectively. Results show that while the ground ionic state is repulsive the first excited ionic state is strongly bound. The photoelectron spectrum of the diethyl sulphide. . .HCI complex is similar to that of H$+ . .HCI

Research paper thumbnail of SERICSAT

International Journal of Hospitality & Tourism Administration, 2007

In the first part of the present paper, a preliminary instrument is developed to measure the sati... more In the first part of the present paper, a preliminary instrument is developed to measure the satisfaction customers experience as an outcome of the perceived fairness of the service recovery process. Towards this end, the concept of justice with its three dimensions, that is, procedural justice, interaction justice, and distributive justice, is modeled after the expectation-performance paradigm of customer satisfaction, resulting in the service recovery satisfaction scale, SERICSAT. The validity and reliability of the scale has been established for tourism and allied services. Later, the scale is employed to examine a proposition related to the effect of tourist satisfaction with particular service recovery situations upon future complaint behavior. It is posited that satisfactory complaint redressal associated with a tourist service has the effect of reinforcing the propensity not only to repurchase that service but also to complain about it in the future.

Research paper thumbnail of Photoelectron spectrum of the Xe . . . HCl van der Waals molecule

Research paper thumbnail of Photoelectron spectrum of the Xe⋅⋅⋅HCl van der Waals molecule

Research paper thumbnail of Knowledge of dental trauma among mothers in Mangalore: Knowledge of dental trauma among mothers in Mangalore

Dental Traumatology, 2010

Abstract – Aim: The aim of this study was to assess the knowledge of Mangalore mothers regarding ... more Abstract – Aim: The aim of this study was to assess the knowledge of Mangalore mothers regarding dental trauma. Methods: A questionnaire inquiring about mother’s knowledge on dental trauma was distributed to 500 working and non-working mothers via their children attending two primary schools in the Mangalore city. Results: Around 68.5% of the mothers were aware of the management of dental trauma. Of the working mothers, 72% were aware of the management of dental trauma while 65% of the non-working mothers were aware. When asked about saving the avulsed tooth, 36% of mothers said that the avulsed tooth can be saved. Regarding mouth guards, 54.5% of the mothers said that they aware of the use of mouth guards to prevent traumatic injuries to the teeth. Of the working mothers 72% knew that mouth guards are useful in the prevention of dental trauma while 37% of the non-working mothers have this knowledge; 68% of the mothers would take the child to the dentist following tooth injury whereas 17% of the mothers would use an emergency kit. Chi-square test and logistic regression analysis indicated a significant difference between the responses of working and the non-working mothers with regard to mouth guard knowledge and recommendation (P-value 0.001). Conclusion: Most of the mothers were graduates and were aware of the emergency management of dental trauma. The working mothers had better knowledge and awareness regarding mouth guards (72%) when compared with non-working mothers (37%).

Research paper thumbnail of Vortical waves incident on junctions between different wave-bearing media

We present a solution to a receptivity-type problem whereby a TS wave or other vortical wave prop... more We present a solution to a receptivity-type problem whereby a TS wave or other vortical wave propagating along a plane Poiseuille flow is incident on a junction between a rigid and compliant wall. Depending on whether the upstream wall is rigid or compliant there can be both transmitted and reflected waves. We show that the incident wave creates a virtual wave-driver. The problem then reduces to determining the strength of the driver in terms of the incident wave amplitude from which the amplitudes of the reflected and transmitted waves can then be determined. A high-Reynolds-number asymptotic theory combined with the use of adjoint eigenmodes is developed to solve this problem. We believe that the main features of this theory are generic for all vortical waves.

Research paper thumbnail of An ultraviolet photoelectron spectroscopic study of the hydrogen bonded dimers of methanol, ethanol, and dimethylamine in the vapor phase

Journal of Molecular Spectroscopy, 1991

... Tokhadze,J. Mol. Struct. 219 (1990) 203. [6] JA. Odutola, R. Viswanathan and TR Dyke, J. Am. ... more ... Tokhadze,J. Mol. Struct. 219 (1990) 203. [6] JA. Odutola, R. Viswanathan and TR Dyke, J. Am. Chem. Soc. 101 (1979)4787. ... Phys. 84 (1986) 1653. 110] iV. Ortiz, Chem. Phys. Letters 134 (1987) 366. [Il] T. Pradeep, MS. Hegde and CNR Rao, J. Chem. Phys. 94 (1991) 4680. ...

Research paper thumbnail of Numerical Analysis of Multistack Microchannel Heat Sinks Cooled by Boiling Two Phase Flow

Microchannel heat sinks are widely regarded as being amongst the most effective heat removal tech... more Microchannel heat sinks are widely regarded as being amongst the most effective heat removal techniques from the space constrained electronic devices. Boiling flow cooled MicroChannel heat sinks have several advantages such as better cooling capability due to higher heat transfer coefficients, ability to handle ultra large heat loads and low coolant inventory requirements. In the present work multi- stack microchannel heat sinks cooled by boiling two phase flow are studied to obtain improved thermal and hydraulic performances. Rectangular cross section multi-stack microchannel heat sinks (with hydraulic diameters of the order of 200 mum) cooled by boiling flow of water are analyzed using the finite element method. A unique twelve noded, repetitive finite element representing a pair of adjacent microchannels is used for the finite element modeling of the microchannel heat sinks. The analysis yields the base temperature distribution, thermal resistance and pressure drop for multi-stack as well as single stack microchannel heat sinks.

Research paper thumbnail of Thermal analysis of single layer counter flow heat sinks with two phase flow

Pm&r, 2004

The thermal performance of single layer counter-flow (SLCF) microchannel heat sinks with two-phas... more The thermal performance of single layer counter-flow (SLCF) microchannel heat sinks with two-phase flow have been analyzed using the finite element method. Parameters such as the thermal resistance, pressure drop and the temperature distribution in SLCF heat sinks with two-phase flow have been determined and compared with those for the single layer parallel flow (SLPF) heat sinks with two-phase flow. It is observed that two-phase flow in the micro-channel heat sinks generally yield low thermal resistance and better temperature uniformity in the stream-wise direction. It is also observed that the thermal performance of the SLCF microchannel heat sinks are better especially at higher base heat fluxes compared to the SLPF heat sinks working under similar conditions

Research paper thumbnail of Thermal analysis of micro-channel heat exchangers with two-phase flow using FEM

International Journal of Numerical Methods for Heat & Fluid Flow, 2005

Abstract:< B> Purpose</B>-To analyze two-phase flow in micro-channel ... more Abstract:< B> Purpose</B>-To analyze two-phase flow in micro-channel heat exchangers used for high flux micro-electronics cooling and to obtain performance parameters such as thermal resistance, pressure drop, etc. Both uniform and non-uniform micro-channel base ...

Research paper thumbnail of Effects of non-uniform base heating in multi stack microchannel heat sinks used for cooling high heat flux electronic chips and devices

Microchannel heat sinks are widely regarded as being amongst the most effective heat removal tech... more Microchannel heat sinks are widely regarded as being amongst the most effective heat removal techniques from the space constrained electronic devices. Electronic components and chips are often subjected to spatially varying heat fluxes and hot spots in certain regions. In the present work, effects of non-uniform base heating on the performance of stacked microchannel heat sinks cooled by forced circulated water is analyzed. Finite element method is used for the analysis wherein a self developed 12 noded element is used for channel discretization. Different types of non-uniform base heating such as non-uniform heating in the ascending and descending orders with respect to the coolant flow direction in the bottom channel, upstream half heating, downstream half heating and center half heating (similar to central hotspot) are analyzed for both parallel flow and counter flow models. The results are compared with the case of uniform heating throughout the base.