An attempt has been made to predict the ice rubble field load on Norströmsgrund lighthouse by usi... more An attempt has been made to predict the ice rubble field load on Norströmsgrund lighthouse by using Cohesive Element (CE) formulation. Two sub-load events were selected to validate the numerical and material model used in simulation of interaction of the ice rubble field and lighthouse. A literature review of simulation of rubble field structure interaction methods is also included in order to illustrate the knowledge gaps and highlight shortcomings of existing techniques. A description of chosen ice rubble field load events and signal post processing is added. A linear Mohr-Coulomb material model was used for the bulk element. For the cohesive element formulation, a material model was chosen which is based on three irreversible mixed-mode interaction with an arbitrary normalized traction-separation law governed by a load curve. The elastic modulus and fracture toughness for the ice rubble field were scaled using the ice rubble field porosity. A parametric study was conducted, and effects were documented. The numerical model predicted similar values for maximum total force, but average and standard deviation values of total force were higher than measured. The observed load drops in measured force time histories were reproduced with reasonable accuracy in simulated force time histories.
An attempt has been made to calibrate the material model parameters of the continuous surface cap... more An attempt has been made to calibrate the material model parameters of the continuous surface cap model with data from punch through tests performed in the Northern Gulf of Bothnia. An axisymmetric ...
Compression and tensile strength properties are important input data for constitutive modelling. ... more Compression and tensile strength properties are important input data for constitutive modelling. Still strength properties of ridged ice are not yet sufficiently investigated. During winter 2011 an ...
Exploration and production of hydrocarbons in artic areas demands stronger, lighter and safer off... more Exploration and production of hydrocarbons in artic areas demands stronger, lighter and safer offshore structures. Wind and sea currents are responsible for ice loads on structure. The design of these structures is based on load level which is usually determined by the drift ice features i.e. ice ridges and surrounding level ice fields if icebergs are not dominating in the area. Ridges drift and hit fixed or moored surface structures such as platforms or ships, or they may scour the seabed endangering pipelines and wellheads. Realistic Constitutive models will help to build more accurate numerical analysis of the ice load. It will decrease the capital costs for the offshore structures, resulting in more economic field development for arctic offshore. This literature review paper is focused on existing models used to simulate the constitutive behavior of the ice rubble. In the first chapter of ridge types, their formation and typical geometrical features has been discussed. The secon...
Introduction Prompt recognition and aggressive management of acute intoxication due to organophos... more Introduction Prompt recognition and aggressive management of acute intoxication due to organophosphorus poisoning are essential to minimize the morbidity and mortality. The present study was undertaken to know the prognosis and outcome of organophosphorus poisoning patients with the estimation of low-cost enzymes like the serum amylase level in a population with financial constraints. Methods In this cross-sectional study, we had enrolled 100 cases that had a history of exposure to organophosphorus compounds, and the serum amylase level was measured in all the patients. We assessed the outcome of all the patients in the form of discharge, need of ventilators, intensive care unit stay, and death. Results The mean serum amylase level in discharge patients was 335.40 ± 192.45, and in the patients who died it was 843.37 ± 22.60. It was significant to predict the outcome (t-value 7.07, p-value 0.0001, statistically significant). Conclusion Serum amylase level shows significant correlatio...
International Journal of Advances in Medicine, 2019
A50-year-old known diabetic female presented to us with gradually progressive dyspnea and swellin... more A50-year-old known diabetic female presented to us with gradually progressive dyspnea and swelling over both lower limbs since 15 days. She was a known case of ischemic heart disease since 3 years on medical management. On examination she was afebrile, heart rate was 128 beats/min, BP-98/52mm of Hg, JVP was raised at 11 cm of water. The respiratory rate was 30/min. Oxygen saturation was 92% while breathing in ambient air. Air entry was decreased on right inter and infra scapular areas with bi basal late inspiratory crepitations.
Introduction: Tranexamic acid (TEA) is used in reducing surgical blood loss. Literature shows no ... more Introduction: Tranexamic acid (TEA) is used in reducing surgical blood loss. Literature shows no optimal regimen recommended for Bilateral Total Knee Arthroplasty (TKA). We evaluated three TEA regimens differing in dosage, timing and mode of administration in bilateral TKA to identify the most effective regimen to reduce blood loss. Methods: We prospectively studied three TEA regimens (25 patients each) as follows: (1) two intraoperative, intravenous doses (IOIO), (2) two intraoperative local applications (LALA), and (3) one preoperative plus two intraoperative, intravenous doses (POIOIO). Two independent parameters of drain loss and total blood loss, calculated by the hemoglobin balance method were statistically evaluated. Results: Mean drain loss was least (412.9 ml) in the POIOIO group, greatest (607.2 ml) in the IOIO group and LALA group in between (579.4 ml), with a statistically significant difference among them (p = 0.0022). On paired evaluation, the drain loss in the POIOIO group was significantly less as compared to the other two groups, whereas the difference between IOIO and LALA was not significant. Mean total blood loss was least in the POIOIO group (1207 ml) and greatest in LALA group (1270 ml). The difference among the groups was not statistically significant (p = 0.80). There was no incidence of any thromboembolic phenomenon. On correlation with our study on Most Effective Regimen in Unilateral TKA, both results were found to substantiate each other.
Abstract Taper waveguides for near field coupling have been designed by finite difference time do... more Abstract Taper waveguides for near field coupling have been designed by finite difference time domain simulations with Silicon core and SiO2 cladding. Thin metal layers above and below the core layer has improved the field profile making them suitable for on-chip near ...
2011 International Conference on Nanoscience, Technology and Societal Implications, 2011
Page 1. Metal nanoparticle chains as light couplers Sushrut Modak, Aniket Patil, Raj Patil, Chand... more Page 1. Metal nanoparticle chains as light couplers Sushrut Modak, Aniket Patil, Raj Patil, ChandraShekhar Garde, RG Purandare Department of Electronics and Telecommunication Vishwakarma Institute of Information Technology Kondhwa, Pune, INDIA 411048 ...
Background: The low contact stress rotating platform (LCS RP) knee (DePuy Orthopedics, Inc, Warsa... more Background: The low contact stress rotating platform (LCS RP) knee (DePuy Orthopedics, Inc, Warsaw, Indiana), in use for last four decades in Western population, is reported to have a survival of more than 95% at 15 to 20 years. The reported Indian experience of this knee is limited to 5 years. Our aim was to report the clinical and radiological results of the LCS RP TKA design in the Indian population with a minimum followup of 10 years. Materials and Methods: Fifty-five LCS knees (45 patients) operated between February 1997 and October 2001 were evaluated retrospectively. LCS design was generally selected if the patient was young (≤65 years of age), active and had no severe deformity. There were 40 female (88.9%) and 5 male (11.1%) patients; 47 knees had osteoarthritis (85.5%) and 8 knees had rheumatoid arthritis (14.5%). Knee Society Scores (KSS) and outcome questionnaire were filled at followup and radiographs were analyzed using Knee Society radiographic evaluation and scoring system. Results: Of 45 patients (55 knees) enrolled, 37 patients (44 knees; 80%) were available for followup at 10 years. Average age was 59.6 years (range 40 to 77). Minimum followup was 10 years (average 12.3 years; range 10 to 15.3 years.). Three knees (6.8%) had been revised, one each for aseptic loosening, bearing dislocation and infection. Mean preoperative KSS of 33 improved to 91 postoperatively. Mean preoperative functional score of 45 improved to 76 postoperatively. Mean preoperative flexion of 113° (90°-140°) reduced to 102° (80°-135°) postoperatively. Erratic femoral rollback and tighter flexion gap to prevent spin out are the probable factors for decreased postoperative range of motion. Five (12%) patients could sit cross-legged and sit on the floor. Anterior knee pain was present in 4.6% (2/44 knees). The survival was 93.2% at 12.3 years. One patient (1.8%) had spin-out of the rotating bearing. No knee had osteolysis or progressive radiolucent lines on X-rays. Conclusion: LCS implant has given good survival (93.2% at 12.3 years) with low rates of spin-out and anterior knee pain and no incidence of osteolysis. Limited flexion post surgery (104°) with only 12% managing to sit cross legged on the floor is a drawback.
An attempt has been made to predict the ice rubble field load on Norströmsgrund lighthouse by usi... more An attempt has been made to predict the ice rubble field load on Norströmsgrund lighthouse by using Cohesive Element (CE) formulation. Two sub-load events were selected to validate the numerical and material model used in simulation of interaction of the ice rubble field and lighthouse. A literature review of simulation of rubble field structure interaction methods is also included in order to illustrate the knowledge gaps and highlight shortcomings of existing techniques. A description of chosen ice rubble field load events and signal post processing is added. A linear Mohr-Coulomb material model was used for the bulk element. For the cohesive element formulation, a material model was chosen which is based on three irreversible mixed-mode interaction with an arbitrary normalized traction-separation law governed by a load curve. The elastic modulus and fracture toughness for the ice rubble field were scaled using the ice rubble field porosity. A parametric study was conducted, and effects were documented. The numerical model predicted similar values for maximum total force, but average and standard deviation values of total force were higher than measured. The observed load drops in measured force time histories were reproduced with reasonable accuracy in simulated force time histories.
An attempt has been made to calibrate the material model parameters of the continuous surface cap... more An attempt has been made to calibrate the material model parameters of the continuous surface cap model with data from punch through tests performed in the Northern Gulf of Bothnia. An axisymmetric ...
Compression and tensile strength properties are important input data for constitutive modelling. ... more Compression and tensile strength properties are important input data for constitutive modelling. Still strength properties of ridged ice are not yet sufficiently investigated. During winter 2011 an ...
Exploration and production of hydrocarbons in artic areas demands stronger, lighter and safer off... more Exploration and production of hydrocarbons in artic areas demands stronger, lighter and safer offshore structures. Wind and sea currents are responsible for ice loads on structure. The design of these structures is based on load level which is usually determined by the drift ice features i.e. ice ridges and surrounding level ice fields if icebergs are not dominating in the area. Ridges drift and hit fixed or moored surface structures such as platforms or ships, or they may scour the seabed endangering pipelines and wellheads. Realistic Constitutive models will help to build more accurate numerical analysis of the ice load. It will decrease the capital costs for the offshore structures, resulting in more economic field development for arctic offshore. This literature review paper is focused on existing models used to simulate the constitutive behavior of the ice rubble. In the first chapter of ridge types, their formation and typical geometrical features has been discussed. The secon...
Introduction Prompt recognition and aggressive management of acute intoxication due to organophos... more Introduction Prompt recognition and aggressive management of acute intoxication due to organophosphorus poisoning are essential to minimize the morbidity and mortality. The present study was undertaken to know the prognosis and outcome of organophosphorus poisoning patients with the estimation of low-cost enzymes like the serum amylase level in a population with financial constraints. Methods In this cross-sectional study, we had enrolled 100 cases that had a history of exposure to organophosphorus compounds, and the serum amylase level was measured in all the patients. We assessed the outcome of all the patients in the form of discharge, need of ventilators, intensive care unit stay, and death. Results The mean serum amylase level in discharge patients was 335.40 ± 192.45, and in the patients who died it was 843.37 ± 22.60. It was significant to predict the outcome (t-value 7.07, p-value 0.0001, statistically significant). Conclusion Serum amylase level shows significant correlatio...
International Journal of Advances in Medicine, 2019
A50-year-old known diabetic female presented to us with gradually progressive dyspnea and swellin... more A50-year-old known diabetic female presented to us with gradually progressive dyspnea and swelling over both lower limbs since 15 days. She was a known case of ischemic heart disease since 3 years on medical management. On examination she was afebrile, heart rate was 128 beats/min, BP-98/52mm of Hg, JVP was raised at 11 cm of water. The respiratory rate was 30/min. Oxygen saturation was 92% while breathing in ambient air. Air entry was decreased on right inter and infra scapular areas with bi basal late inspiratory crepitations.
Introduction: Tranexamic acid (TEA) is used in reducing surgical blood loss. Literature shows no ... more Introduction: Tranexamic acid (TEA) is used in reducing surgical blood loss. Literature shows no optimal regimen recommended for Bilateral Total Knee Arthroplasty (TKA). We evaluated three TEA regimens differing in dosage, timing and mode of administration in bilateral TKA to identify the most effective regimen to reduce blood loss. Methods: We prospectively studied three TEA regimens (25 patients each) as follows: (1) two intraoperative, intravenous doses (IOIO), (2) two intraoperative local applications (LALA), and (3) one preoperative plus two intraoperative, intravenous doses (POIOIO). Two independent parameters of drain loss and total blood loss, calculated by the hemoglobin balance method were statistically evaluated. Results: Mean drain loss was least (412.9 ml) in the POIOIO group, greatest (607.2 ml) in the IOIO group and LALA group in between (579.4 ml), with a statistically significant difference among them (p = 0.0022). On paired evaluation, the drain loss in the POIOIO group was significantly less as compared to the other two groups, whereas the difference between IOIO and LALA was not significant. Mean total blood loss was least in the POIOIO group (1207 ml) and greatest in LALA group (1270 ml). The difference among the groups was not statistically significant (p = 0.80). There was no incidence of any thromboembolic phenomenon. On correlation with our study on Most Effective Regimen in Unilateral TKA, both results were found to substantiate each other.
Abstract Taper waveguides for near field coupling have been designed by finite difference time do... more Abstract Taper waveguides for near field coupling have been designed by finite difference time domain simulations with Silicon core and SiO2 cladding. Thin metal layers above and below the core layer has improved the field profile making them suitable for on-chip near ...
2011 International Conference on Nanoscience, Technology and Societal Implications, 2011
Page 1. Metal nanoparticle chains as light couplers Sushrut Modak, Aniket Patil, Raj Patil, Chand... more Page 1. Metal nanoparticle chains as light couplers Sushrut Modak, Aniket Patil, Raj Patil, ChandraShekhar Garde, RG Purandare Department of Electronics and Telecommunication Vishwakarma Institute of Information Technology Kondhwa, Pune, INDIA 411048 ...
Background: The low contact stress rotating platform (LCS RP) knee (DePuy Orthopedics, Inc, Warsa... more Background: The low contact stress rotating platform (LCS RP) knee (DePuy Orthopedics, Inc, Warsaw, Indiana), in use for last four decades in Western population, is reported to have a survival of more than 95% at 15 to 20 years. The reported Indian experience of this knee is limited to 5 years. Our aim was to report the clinical and radiological results of the LCS RP TKA design in the Indian population with a minimum followup of 10 years. Materials and Methods: Fifty-five LCS knees (45 patients) operated between February 1997 and October 2001 were evaluated retrospectively. LCS design was generally selected if the patient was young (≤65 years of age), active and had no severe deformity. There were 40 female (88.9%) and 5 male (11.1%) patients; 47 knees had osteoarthritis (85.5%) and 8 knees had rheumatoid arthritis (14.5%). Knee Society Scores (KSS) and outcome questionnaire were filled at followup and radiographs were analyzed using Knee Society radiographic evaluation and scoring system. Results: Of 45 patients (55 knees) enrolled, 37 patients (44 knees; 80%) were available for followup at 10 years. Average age was 59.6 years (range 40 to 77). Minimum followup was 10 years (average 12.3 years; range 10 to 15.3 years.). Three knees (6.8%) had been revised, one each for aseptic loosening, bearing dislocation and infection. Mean preoperative KSS of 33 improved to 91 postoperatively. Mean preoperative functional score of 45 improved to 76 postoperatively. Mean preoperative flexion of 113° (90°-140°) reduced to 102° (80°-135°) postoperatively. Erratic femoral rollback and tighter flexion gap to prevent spin out are the probable factors for decreased postoperative range of motion. Five (12%) patients could sit cross-legged and sit on the floor. Anterior knee pain was present in 4.6% (2/44 knees). The survival was 93.2% at 12.3 years. One patient (1.8%) had spin-out of the rotating bearing. No knee had osteolysis or progressive radiolucent lines on X-rays. Conclusion: LCS implant has given good survival (93.2% at 12.3 years) with low rates of spin-out and anterior knee pain and no incidence of osteolysis. Limited flexion post surgery (104°) with only 12% managing to sit cross legged on the floor is a drawback.
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