The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Niranjan Karak - One of the best experts on this subject based on the ideXlab platform.
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Sustainable starch modified polyol based tough, biocompatible, hyperbranched polyurethane with a shape Memory Attribute
New Journal of Chemistry, 2016Co-Authors: Rituparna Duarah, Yogendra Pratap Singh, Biman B. Mandal, Niranjan KarakAbstract:In recent years, application of shape Memory polymers (SMPs) has gained substantial impetus in the design of improved and minimally invasive smart biomedical implant devices based on their thermal response behavior. In this direction, the authors designed a tough, biodegradable and biocompatible shape Memory hyperbranched polyurethane (HPU) suitable for use in medical implant devices. HPUs with three different compositions containing 11, 14 and 17 wt% of starch modified polyol as the branch generating moiety were synthesized via an Ax + By (x, y ≥ 2) approach, without the use of any plasticizer or catalyst. The structures of the synthesized HPU were confirmed from FTIR, NMR and various analytical studies. The biodegradable HPU exhibited combined Attributes of remarkable mechanical properties (17 MPa tensile strength, 1450% elongation at break, 6.5 kg scratch hardness, >100 cm impact strength and 163 MJ m−3 toughness) at room temperature and the desired shape Memory behavior (98.8% shape fixity and 98.9% shape recovery) at around body temperature (37 ± 1) °C. Also, no significant change in mechanical performance was observed under wet conditions. Moreover, cell proliferation and live/dead cell viability assays confirmed the biocompatibility of the synthesized HPU. Thus, the overall results indicated its potential application as an advanced material in the biomedical field.
Rituparna Duarah - One of the best experts on this subject based on the ideXlab platform.
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Sustainable starch modified polyol based tough, biocompatible, hyperbranched polyurethane with a shape Memory Attribute
New Journal of Chemistry, 2016Co-Authors: Rituparna Duarah, Yogendra Pratap Singh, Biman B. Mandal, Niranjan KarakAbstract:In recent years, application of shape Memory polymers (SMPs) has gained substantial impetus in the design of improved and minimally invasive smart biomedical implant devices based on their thermal response behavior. In this direction, the authors designed a tough, biodegradable and biocompatible shape Memory hyperbranched polyurethane (HPU) suitable for use in medical implant devices. HPUs with three different compositions containing 11, 14 and 17 wt% of starch modified polyol as the branch generating moiety were synthesized via an Ax + By (x, y ≥ 2) approach, without the use of any plasticizer or catalyst. The structures of the synthesized HPU were confirmed from FTIR, NMR and various analytical studies. The biodegradable HPU exhibited combined Attributes of remarkable mechanical properties (17 MPa tensile strength, 1450% elongation at break, 6.5 kg scratch hardness, >100 cm impact strength and 163 MJ m−3 toughness) at room temperature and the desired shape Memory behavior (98.8% shape fixity and 98.9% shape recovery) at around body temperature (37 ± 1) °C. Also, no significant change in mechanical performance was observed under wet conditions. Moreover, cell proliferation and live/dead cell viability assays confirmed the biocompatibility of the synthesized HPU. Thus, the overall results indicated its potential application as an advanced material in the biomedical field.
Soheil Ganjefar - One of the best experts on this subject based on the ideXlab platform.
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Maximum power extraction from fractional order doubly fed induction generator based wind turbines using homotopy singular perturbation method
International Journal of Electrical Power & Energy Systems, 2020Co-Authors: Mahnaz Abolvafaei, Soheil GanjefarAbstract:Abstract In this paper, a novel control mechanism is presented for the control of variable speed wind turbine (VSWT) with a fractional-order doubly fed induction generator (DFIG) to extract the maximum power in region 2. Firstly, the homotopy singular perturbation method (HSPM) is proposed to simplify the fractional order nonlinear model, to reduce the long Memory Attribute, and to decrease the mechanical stress. This method is a composition of fractional order singular perturbation method (SPM) and modification of the homotopy perturbation method (HPM). Using this method, the nonlinear fractional order DFIG based VSWT is separated into two lower order subsystems, including nonlinear integer order subsystem and linear fractional order subsystem. Integer order modeling is applied to have the maximum wind power extraction and to increase the trajectory tracking speed, while the fractional order modeling is exerted to reduce the mechanical loads and to ensure better tracking. Then, a sliding mode controller based on HSPM is designed and applied to the original fractional order nonlinear system. Stability of the original system is evaluated by investigating the Lyapunov stability theorem for each subsystem. The controller performance designed based on HSPM is compared to the designed controller performance for fractional order nonlinear system decomposed using fractional order SPM, integer order nonlinear system decomposed by SPM, and integer order nonlinear system without simplification. The simulation results affirm the effectiveness of the controller design based on the proposed method.
Biman B. Mandal - One of the best experts on this subject based on the ideXlab platform.
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Sustainable starch modified polyol based tough, biocompatible, hyperbranched polyurethane with a shape Memory Attribute
New Journal of Chemistry, 2016Co-Authors: Rituparna Duarah, Yogendra Pratap Singh, Biman B. Mandal, Niranjan KarakAbstract:In recent years, application of shape Memory polymers (SMPs) has gained substantial impetus in the design of improved and minimally invasive smart biomedical implant devices based on their thermal response behavior. In this direction, the authors designed a tough, biodegradable and biocompatible shape Memory hyperbranched polyurethane (HPU) suitable for use in medical implant devices. HPUs with three different compositions containing 11, 14 and 17 wt% of starch modified polyol as the branch generating moiety were synthesized via an Ax + By (x, y ≥ 2) approach, without the use of any plasticizer or catalyst. The structures of the synthesized HPU were confirmed from FTIR, NMR and various analytical studies. The biodegradable HPU exhibited combined Attributes of remarkable mechanical properties (17 MPa tensile strength, 1450% elongation at break, 6.5 kg scratch hardness, >100 cm impact strength and 163 MJ m−3 toughness) at room temperature and the desired shape Memory behavior (98.8% shape fixity and 98.9% shape recovery) at around body temperature (37 ± 1) °C. Also, no significant change in mechanical performance was observed under wet conditions. Moreover, cell proliferation and live/dead cell viability assays confirmed the biocompatibility of the synthesized HPU. Thus, the overall results indicated its potential application as an advanced material in the biomedical field.
Yogendra Pratap Singh - One of the best experts on this subject based on the ideXlab platform.
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Sustainable starch modified polyol based tough, biocompatible, hyperbranched polyurethane with a shape Memory Attribute
New Journal of Chemistry, 2016Co-Authors: Rituparna Duarah, Yogendra Pratap Singh, Biman B. Mandal, Niranjan KarakAbstract:In recent years, application of shape Memory polymers (SMPs) has gained substantial impetus in the design of improved and minimally invasive smart biomedical implant devices based on their thermal response behavior. In this direction, the authors designed a tough, biodegradable and biocompatible shape Memory hyperbranched polyurethane (HPU) suitable for use in medical implant devices. HPUs with three different compositions containing 11, 14 and 17 wt% of starch modified polyol as the branch generating moiety were synthesized via an Ax + By (x, y ≥ 2) approach, without the use of any plasticizer or catalyst. The structures of the synthesized HPU were confirmed from FTIR, NMR and various analytical studies. The biodegradable HPU exhibited combined Attributes of remarkable mechanical properties (17 MPa tensile strength, 1450% elongation at break, 6.5 kg scratch hardness, >100 cm impact strength and 163 MJ m−3 toughness) at room temperature and the desired shape Memory behavior (98.8% shape fixity and 98.9% shape recovery) at around body temperature (37 ± 1) °C. Also, no significant change in mechanical performance was observed under wet conditions. Moreover, cell proliferation and live/dead cell viability assays confirmed the biocompatibility of the synthesized HPU. Thus, the overall results indicated its potential application as an advanced material in the biomedical field.