The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Pankaj Kumar Choudhury - One of the best experts on this subject based on the ideXlab platform.
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Investigation of uniaxial anisotropic chiral metamaterial waveguide with perfect electromagnetic conductor loading
Optik, 2015Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:Abstract The paper presents investigations of the electromagnetic characteristics of circular waveguides made of uniaxial anisotropic chiral medium; the outer surface of the guide being coated with a PEMC (perfect electromagnetic conductor) medium. The emphasis is given on the Energy Flux Density patterns of such guides with varieties of anisotropic chiral materials. Dispersion relation of the guide is developed, and followed by the evaluation of sustained modes, which determine the Energy Flux Density patterns corresponding to different low-order hybrid modes. The Flux Density characteristics provide the evidence of existing backward waves in uniaxial anisotropic mediums, contributing more to the phenomenon of slow light in chiral metamaterials.
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Energy Flux Density in twisted clad optical fibers
2013 IEEE International Conference of Electron Devices and Solid-state Circuits, 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:The paper reports on the wave propagation through twisted clad optical fibers. Analytical treatment of the boundary-value problem has been presented to evaluate the dispersion relation of the fiber followed by the Flux densities. Considering the EH11 and EH12 modes, the propagation constants are obtained to deduce the Energy Flux Density corresponding to these modes. It has been theoretically investigated that the increase of pitch causes the Flux Density to increase in the fiber core - the feature that would be of great use to device attenuators in communication systems.
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Energy Flux Density in a DB boundary loaded uniaxial anisotropic chiral fiber
2013 10th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology, 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar Choudhury, A. IbrahimAbstract:A detailed analytical investigation of the propagation of electromagnetic waves in optical fibers made of uniaxial anisotropic chiral medium is presented. The emphasis is given on the characteristics of Flux Density patterns in the guide. In the structure of fiber, the outer region is assumed to be as bounded by a DB boundary. The study has been performed considering varying radial parameter of the guide. Also, two different types of anisotropic mediums as well as fiber dimensions are taken into account. The dispersion relation of the guide is deduced which provides the allowed values of propagation constants. This is followed by the evolution of the expression for the Flux Density in the fiber. A study of the Flux Density pattern reveals the existence of both the forward as well as the backward waves in the fiber structure under consideration.
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On the Wave Propagation through Twisted Clad Optical Fibers Under Slow Wave Approximation
International Photonics and Optoelectronics Meetings (POEM), 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:Propagation of Energy Flux Density through twisted clad optical fibers is studied under slow wave approximation. Twists are introduced in the form of conducting helical windings, and dominance of helix pitch angle is detected.
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EFFECTS ON THE Energy Flux Density DUE TO PITCH IN TWISTED CLAD OPTICAL FIBERS
Progress In Electromagnetics Research, 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:The paper deals with the propagation of electromagnetic waves through twisted clad dielectric optical flbers. The structure of these flbers is analogous to travelling wave tubes used in microwave devices, and the usefulness would be in the areas of optical sensing. This is because the twists in flber would be afiected due to the imposed stress and/or strain, leaving thereby the possibility to alter the propagation characteristics. A rigorous analytical investigation has been carried out with the emphasis on the Energy ∞ux Density patterns due to the difierent propagating modes in the flber. The dispersion relations of the system are deduced and the Energy ∞ux densities are evaluated under difierent pitch angles of twist. The efiect due to conducting helix pitch on the electromagnetic wave propagation is emphasized.
Muhammad Abuzar Baqir - One of the best experts on this subject based on the ideXlab platform.
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Investigation of uniaxial anisotropic chiral metamaterial waveguide with perfect electromagnetic conductor loading
Optik, 2015Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:Abstract The paper presents investigations of the electromagnetic characteristics of circular waveguides made of uniaxial anisotropic chiral medium; the outer surface of the guide being coated with a PEMC (perfect electromagnetic conductor) medium. The emphasis is given on the Energy Flux Density patterns of such guides with varieties of anisotropic chiral materials. Dispersion relation of the guide is developed, and followed by the evaluation of sustained modes, which determine the Energy Flux Density patterns corresponding to different low-order hybrid modes. The Flux Density characteristics provide the evidence of existing backward waves in uniaxial anisotropic mediums, contributing more to the phenomenon of slow light in chiral metamaterials.
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Energy Flux Density in twisted clad optical fibers
2013 IEEE International Conference of Electron Devices and Solid-state Circuits, 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:The paper reports on the wave propagation through twisted clad optical fibers. Analytical treatment of the boundary-value problem has been presented to evaluate the dispersion relation of the fiber followed by the Flux densities. Considering the EH11 and EH12 modes, the propagation constants are obtained to deduce the Energy Flux Density corresponding to these modes. It has been theoretically investigated that the increase of pitch causes the Flux Density to increase in the fiber core - the feature that would be of great use to device attenuators in communication systems.
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Energy Flux Density in a DB boundary loaded uniaxial anisotropic chiral fiber
2013 10th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology, 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar Choudhury, A. IbrahimAbstract:A detailed analytical investigation of the propagation of electromagnetic waves in optical fibers made of uniaxial anisotropic chiral medium is presented. The emphasis is given on the characteristics of Flux Density patterns in the guide. In the structure of fiber, the outer region is assumed to be as bounded by a DB boundary. The study has been performed considering varying radial parameter of the guide. Also, two different types of anisotropic mediums as well as fiber dimensions are taken into account. The dispersion relation of the guide is deduced which provides the allowed values of propagation constants. This is followed by the evolution of the expression for the Flux Density in the fiber. A study of the Flux Density pattern reveals the existence of both the forward as well as the backward waves in the fiber structure under consideration.
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On the Wave Propagation through Twisted Clad Optical Fibers Under Slow Wave Approximation
International Photonics and Optoelectronics Meetings (POEM), 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:Propagation of Energy Flux Density through twisted clad optical fibers is studied under slow wave approximation. Twists are introduced in the form of conducting helical windings, and dominance of helix pitch angle is detected.
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EFFECTS ON THE Energy Flux Density DUE TO PITCH IN TWISTED CLAD OPTICAL FIBERS
Progress In Electromagnetics Research, 2013Co-Authors: Muhammad Abuzar Baqir, Pankaj Kumar ChoudhuryAbstract:The paper deals with the propagation of electromagnetic waves through twisted clad dielectric optical flbers. The structure of these flbers is analogous to travelling wave tubes used in microwave devices, and the usefulness would be in the areas of optical sensing. This is because the twists in flber would be afiected due to the imposed stress and/or strain, leaving thereby the possibility to alter the propagation characteristics. A rigorous analytical investigation has been carried out with the emphasis on the Energy ∞ux Density patterns due to the difierent propagating modes in the flber. The dispersion relations of the system are deduced and the Energy ∞ux densities are evaluated under difierent pitch angles of twist. The efiect due to conducting helix pitch on the electromagnetic wave propagation is emphasized.
Ömer Gezginaslan - One of the best experts on this subject based on the ideXlab platform.
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High-Energy Flux Density Extracorporeal Shock-wave Therapy Versus Therapeutic Steroid Injection in Costochondritis: A Single-Blind, Randomised Controlled Study
Aktuelle Rheumatologie, 2020Co-Authors: Halil Çiftçi, Ömer GezginaslanAbstract:Background This study aims to investigate the effects of extracorporeal shock-wave therapy (ESWT) and intra-articular steroid injection (IASI) on pain, depression, quality of life and pressure pain threshold (PPT) in patients with costochondritis. Methods A total of 67 patients diagnosed with costochondritis were included. Patients were divided into 2 groups. Group 1 (n=34) received high-Energy Flux Density (H-ESWT) (> 0.28 mJ/mm2) for a total of 7 sessions at 3-day intervals. Group 2 (n=33) received IASI twice at 2-week intervals. At baseline and one month after treatment, Visual Analog Scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Beck Depression Inventory (BDI) scores and PPT values were compared. Results There was a statistically significant decrease in VAS scores after treatment compared with baseline scores in both groups. The PPT and SF-36 subscale scores were also statistically significantly higher (p 0,28 mJ/mm²). Gruppe 2 (n=33) erhielt 2-mal im Abstand von 2 Wochen IASI. Zu Studienbeginn und einen Monat nach der Behandlung wurden die Werte fur Visual Analog Scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Beck Depression Inventory (BDI) und PPT-Werte verglichen. Ergebnisse Es gab eine statistisch signifikante Abnahme der VAS-Werte nach der Behandlung im Vergleich zu den Ausgangswerten in beiden Gruppen. Die Subskalenwerte fur PPT und SF-36 waren ebenfalls statistisch signifikant hoher (p
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high Energy Flux Density extracorporeal shock wave therapy versus therapeutic steroid injection in costochondritis a single blind randomised controlled study
Aktuelle Rheumatologie, 2020Co-Authors: Halil Çiftçi, Ömer GezginaslanAbstract:Background This study aims to investigate the effects of extracorporeal shock-wave therapy (ESWT) and intra-articular steroid injection (IASI) on pain, depression, quality of life and pressure pain threshold (PPT) in patients with costochondritis. Methods A total of 67 patients diagnosed with costochondritis were included. Patients were divided into 2 groups. Group 1 (n=34) received high-Energy Flux Density (H-ESWT) (> 0.28 mJ/mm2) for a total of 7 sessions at 3-day intervals. Group 2 (n=33) received IASI twice at 2-week intervals. At baseline and one month after treatment, Visual Analog Scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Beck Depression Inventory (BDI) scores and PPT values were compared. Results There was a statistically significant decrease in VAS scores after treatment compared with baseline scores in both groups. The PPT and SF-36 subscale scores were also statistically significantly higher (p<0.05). After treatment, VAS and PPT showed a significantly better improvement in Group 1 compared to Group 2. There was a significant correlation between VAS and SF-36 physical functioning as well as pain subscales in Group 1 and a significant correlation between VAS and SF-36 physical functioning in Group 2. Conclusions Our data suggest that both treatments H-ESWT and IASI are effective in costochondritis patients. Of note, H-ESWT has a stronger effect on pain and PPT scores. Hintergrund Ziel dieser Studie ist es, die Auswirkungen der extrakorporalen Stoswellentherapie (ESWT) und der intraartikularen Steroidinjektion (IASI) auf Schmerzen, Depressionen, Lebensqualitat und Druckschmerzschwelle (PPT) bei Patienten mit Costochondritis zu untersuchen. Methoden Insgesamt wurden 67 Patienten mit der Diagnose einer Costochondritis eingeschlossen. Die Patienten wurden in 2 Gruppen eingeteilt. Gruppe 1 (n=34) erhielt fur insgesamt 7 Sitzungen in 3-tagigen Intervallen eine hochenergetische Flussdichte (H-ESWT) (> 0,28 mJ/mm²). Gruppe 2 (n=33) erhielt 2-mal im Abstand von 2 Wochen IASI. Zu Studienbeginn und einen Monat nach der Behandlung wurden die Werte fur Visual Analog Scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Beck Depression Inventory (BDI) und PPT-Werte verglichen. Ergebnisse Es gab eine statistisch signifikante Abnahme der VAS-Werte nach der Behandlung im Vergleich zu den Ausgangswerten in beiden Gruppen. Die Subskalenwerte fur PPT und SF-36 waren ebenfalls statistisch signifikant hoher (p<0,05). Nach der Behandlung zeigten VAS und PPT eine signifikant grosere Verbesserung in Gruppe 1 im Vergleich zu Gruppe 2. Es bestand ein signifikanter Zusammenhang zwischen der VAS und der korperlichen Funktionsfahigkeit nach SF-36, sowie Schmerz-Subskalen in Gruppe 1 und eine signifikante Korrelation zwischen der VAS und der korperlichen Funktionsfahigkeit nach SF-36 in Gruppe 2. Schlussfolgerungen Unsere Daten deuten darauf hin, dass sowohl die H-ESWT als auch die IASI-Behandlung bei Patienten mit Costochondritis wirksam sind. Die H-ESWT hat dabei eine starkere Wirkung auf Schmerzen und PPT-Scores.
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High-Energy Flux Density Extracorporeal Shock Wave Therapy Versus Traditional Physical Therapy Modalities in Myofascial Pain Syndrome: A Randomized-controlled, Single-Blind Trial
Archives of rheumatology, 2020Co-Authors: Ömer Gezginaslan, Sevgi Gümüş AtalayAbstract:Objectives This study aims to investigate the effects of extracorporeal shock wave therapy (ESWT) on pain, sleep, fatigue, disability, depression, and quality of life (QoL) in patients with myofascial pain syndrome (MPS). Patients and methods Between March 2018 and September 2018, a total of 94 patients (16 males, 78 females; mean age 44.2±11.94 years; range, 19 to 74 years) with the diagnosis of MPS were included in the study. The patients were divided into two groups. The treatment group consisted of 49 patients and a total of seven sessions of high-Energy Flux Density ESWT (H-ESWT) (0.26 mJ/mm2) were given with three days interval. The control group consisted of 45 patients and the treatment of hot pack, transcutaneous electrical nerve stimulation, and ultrasound was given for five days for two weeks. At baseline and one month after treatment, the visual analog scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Functional Assessment of Chronic Illness Therapy (FACIT)-Fatigue Scale, Neck Disability Index (NDI), and Beck Depression Inventory (BDI) scores were compared between the groups. Results There were no statistically significant differences in the age, sex, demographic characteristics, and baseline VAS, SF-36, NDI, BDI, FACIT, and PSQI scores between the groups (p>0.05). In the ESWT group, there was a statistically significant decrease in the VAS, SF-36, NDI, BDI, FACIT, and PSQI scores after treatment compared to the baseline scores, while only the SF-36 subscale scores were statistically significantly higher (p
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high Energy Flux Density extracorporeal shock wave therapy versus traditional physical therapy modalities in myofascial pain syndrome a randomized controlled single blind trial
Archives of Rheumatology, 2020Co-Authors: Ömer Gezginaslan, Sevgi Gümüş AtalayAbstract:Objectives This study aims to investigate the effects of extracorporeal shock wave therapy (ESWT) on pain, sleep, fatigue, disability, depression, and quality of life (QoL) in patients with myofascial pain syndrome (MPS). Patients and methods Between March 2018 and September 2018, a total of 94 patients (16 males, 78 females; mean age 44.2±11.94 years; range, 19 to 74 years) with the diagnosis of MPS were included in the study. The patients were divided into two groups. The treatment group consisted of 49 patients and a total of seven sessions of high-Energy Flux Density ESWT (H-ESWT) (0.26 mJ/mm2) were given with three days interval. The control group consisted of 45 patients and the treatment of hot pack, transcutaneous electrical nerve stimulation, and ultrasound was given for five days for two weeks. At baseline and one month after treatment, the visual analog scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Functional Assessment of Chronic Illness Therapy (FACIT)-Fatigue Scale, Neck Disability Index (NDI), and Beck Depression Inventory (BDI) scores were compared between the groups. Results There were no statistically significant differences in the age, sex, demographic characteristics, and baseline VAS, SF-36, NDI, BDI, FACIT, and PSQI scores between the groups (p>0.05). In the ESWT group, there was a statistically significant decrease in the VAS, SF-36, NDI, BDI, FACIT, and PSQI scores after treatment compared to the baseline scores, while only the SF-36 subscale scores were statistically significantly higher (p<0.05). There was a statistically significant correlation between the VAS and SF-36 scores and the BDI, NDI, FACIT and PSQI scores after the treatment. Conclusion Our study results suggest that H-ESWT is more effective than traditional physical therapy methods on pain, QoL, sleep, fatigue, depression, and disability in patients with MPS.
Sevgi Gümüş Atalay - One of the best experts on this subject based on the ideXlab platform.
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High-Energy Flux Density Extracorporeal Shock Wave Therapy Versus Traditional Physical Therapy Modalities in Myofascial Pain Syndrome: A Randomized-controlled, Single-Blind Trial
Archives of rheumatology, 2020Co-Authors: Ömer Gezginaslan, Sevgi Gümüş AtalayAbstract:Objectives This study aims to investigate the effects of extracorporeal shock wave therapy (ESWT) on pain, sleep, fatigue, disability, depression, and quality of life (QoL) in patients with myofascial pain syndrome (MPS). Patients and methods Between March 2018 and September 2018, a total of 94 patients (16 males, 78 females; mean age 44.2±11.94 years; range, 19 to 74 years) with the diagnosis of MPS were included in the study. The patients were divided into two groups. The treatment group consisted of 49 patients and a total of seven sessions of high-Energy Flux Density ESWT (H-ESWT) (0.26 mJ/mm2) were given with three days interval. The control group consisted of 45 patients and the treatment of hot pack, transcutaneous electrical nerve stimulation, and ultrasound was given for five days for two weeks. At baseline and one month after treatment, the visual analog scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Functional Assessment of Chronic Illness Therapy (FACIT)-Fatigue Scale, Neck Disability Index (NDI), and Beck Depression Inventory (BDI) scores were compared between the groups. Results There were no statistically significant differences in the age, sex, demographic characteristics, and baseline VAS, SF-36, NDI, BDI, FACIT, and PSQI scores between the groups (p>0.05). In the ESWT group, there was a statistically significant decrease in the VAS, SF-36, NDI, BDI, FACIT, and PSQI scores after treatment compared to the baseline scores, while only the SF-36 subscale scores were statistically significantly higher (p
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high Energy Flux Density extracorporeal shock wave therapy versus traditional physical therapy modalities in myofascial pain syndrome a randomized controlled single blind trial
Archives of Rheumatology, 2020Co-Authors: Ömer Gezginaslan, Sevgi Gümüş AtalayAbstract:Objectives This study aims to investigate the effects of extracorporeal shock wave therapy (ESWT) on pain, sleep, fatigue, disability, depression, and quality of life (QoL) in patients with myofascial pain syndrome (MPS). Patients and methods Between March 2018 and September 2018, a total of 94 patients (16 males, 78 females; mean age 44.2±11.94 years; range, 19 to 74 years) with the diagnosis of MPS were included in the study. The patients were divided into two groups. The treatment group consisted of 49 patients and a total of seven sessions of high-Energy Flux Density ESWT (H-ESWT) (0.26 mJ/mm2) were given with three days interval. The control group consisted of 45 patients and the treatment of hot pack, transcutaneous electrical nerve stimulation, and ultrasound was given for five days for two weeks. At baseline and one month after treatment, the visual analog scale (VAS), Short Form-36 (SF-36), Pittsburgh Sleep Quality Index (PSQI), Functional Assessment of Chronic Illness Therapy (FACIT)-Fatigue Scale, Neck Disability Index (NDI), and Beck Depression Inventory (BDI) scores were compared between the groups. Results There were no statistically significant differences in the age, sex, demographic characteristics, and baseline VAS, SF-36, NDI, BDI, FACIT, and PSQI scores between the groups (p>0.05). In the ESWT group, there was a statistically significant decrease in the VAS, SF-36, NDI, BDI, FACIT, and PSQI scores after treatment compared to the baseline scores, while only the SF-36 subscale scores were statistically significantly higher (p<0.05). There was a statistically significant correlation between the VAS and SF-36 scores and the BDI, NDI, FACIT and PSQI scores after the treatment. Conclusion Our study results suggest that H-ESWT is more effective than traditional physical therapy methods on pain, QoL, sleep, fatigue, depression, and disability in patients with MPS.
Wu Weiwei - One of the best experts on this subject based on the ideXlab platform.
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Extracorporeal shock wave therapy with low-Energy Flux Density inhibits hypertrophic scar formation in an animal model.
International journal of molecular medicine, 2018Co-Authors: Jing-chun Zhao, Bo-ru Zhang, Lei Hong, Kai Shi, Wu WeiweiAbstract:Hypertrophic scar is characterized by excessive deposits of collagen during skin wound healing, which could become a challenge to clinicians. This study assessed the effects of the extracorporeal shock wave therapy (ESWT) on hyper-trophic scar formation and the underlying gene regulation. A rabbit ear hypertrophic scar model was generated and randomly divided into three groups: L-ESWT group to receive L-ESWT (Energy Flux Density of 0.1 mJ/mm2), H-ESWT (Energy Flux Density of 0.2 mJ/mm2) and sham ESWT group (S-ESWT). Hypertrophic scar tissues were then collected and stained with hematoxylin and eosin (H&E) and Masson's trichrome staining, respectively, to assess scar elevation index (SEI), fibroblast Density and collagen fiber arrangement. Expression of cell proliferation marker proliferating cell nuclear antigen (PCNA) and α-smooth muscle actin (α-SMA) were assessed using RT-PCR and immunohistochemistry in hypertrophic scar tissues. H&E staining sections showed significant reduction of SEI and fibroblast Density in both ESWT treatment groups compared to S-ESWT, but there was no dramatic difference between L-ESWT and H-ESWT groups. Masson's trichrome staining showed that collagen fibers were more slender and broader and oriented in parallel to skin surface after administration of ESWT compared to control tissues. At the gene level, PCNA-positive fibroblasts and α-SMA-positive myofibroblasts were significantly decreased after L-ESWT or H-ESWT compared to the controls. Furthermore, there was no significant difference in expression of PCNA mRNA between L-ESWT or H-ESWT and S-ESWT, whereas expression of α-SMA mRNA significantly decreased in L-ESWT compared to that of H-ESWT and S-ESWT (P=0.002 and P=0.030, respectively). In conclusion, L-ESWT could be effective on suppression of hypertrophic scar formation by inhibition of scar elevation index and fibroblast Density as well as α-SMA expression in hypertrophic scar tissues of the rabbit model.