The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Ricardo Oliveira - One of the best experts on this subject based on the ideXlab platform.

  • Strain Sensitivity Control of an In-Series Silica and Polymer FBG
    Sensors, 2018
    Co-Authors: Ricardo Oliveira, Lúcia Bilro, Rogerio N Nogueira
    Abstract:

    This work reports on the use of an in-series silica and polymer Fiber Bragg grating (FBG) to control the FBG strain sensitivities and enhance in the case of the polymer Fiber Bragg grating (PFBG). Due to differences in the Young’s Modulus of the Fibers employed, the amount of strain is unequally distributed in each Fiber Section. By acting on the silica Fiber length, it was possible to control the strain sensitivity of the two FBGs, allowing a polymer FBG strain sensitivity much higher than the one found in the elementary Fiber to be obtained. The influence of the diameter of the polymer Fiber on the strain sensitivities of the FBGs was also investigated. Results have shown that, besides the strain sensitivity control, an even greater improvement in the PFBG strain sensitivity can be achieved.

  • Strain Sensitivity Enhancement of a Sensing Head Based on ZEONEX Polymer FBG in Series With Silica Fiber
    Journal of Lightwave Technology, 2018
    Co-Authors: Ricardo Oliveira, Cristiano M. B. Cordeiro, Lúcia Bilro, Thiago H. R. Marques, Rogério Nogueira
    Abstract:

    This study presents the use of a sensing device composed of an all ZEONEX-480R polymer Fiber Bragg grating, in series with a silica Fiber, for the control/enhancement of the strain sensitivity. The results show that the amount of strain imposed in the total gauge length is unequally distributed in each Fiber Section. The low Young's modulus and diameter of the polymer Fiber employed, compared to the silica one, leads to a higher strain density in the former. Additionally, the control of the length of each Fiber Section plays also an important role on the distribution of strain in each Fiber. Theoretical results show that higher strain sensitivities are easier to achieve for short and long polymer and silica Fiber lengths, respectively. Experimental characterization of a sensing head composed by a 2.6 cm polymer optical Fiber and different lengths of silica Fiber, led us to control and improve the strain sensitivity of the sensing device.

R. L. Terjung - One of the best experts on this subject based on the ideXlab platform.

  • IMP reamination to AMP in rat skeletal muscle Fiber types
    American Journal of Physiology-Cell Physiology, 1996
    Co-Authors: P. C. Tullson, P. G. Arabadjis, K. W. Rundell, R. L. Terjung
    Abstract:

    Inosine 5'-monophosphate (IMP) reamination in skeletal muscle Fiber Sections of the rat hindlimb was studied. High IMP concentrations were established during ischemic contractions in each Fiber Section: 3.1, 2.8, or 0.6 mumol/g in the fast-twitch white (FTW), fast-twitch red (FTR), and slow-twitch red (STR) muscle Sections, respectively. Thereafter blood flow was restored and stimulation was discontinued to allow reamination of IMP. After 0, 2, 5, 10, 15, or 20 min of recovery, muscle Sections were freeze-clamped and analyzed for metabolite contents. IMP was nearly fully reaminated after 10 and 20 min of recovery in STR and FTR muscles, respectively. Reamination in TW Fibers was delayed and slower, with only 50% of the IMP reaminated after 20 min of recovery. Significant recovery (approximately 75%) of phosphocreatine occurs in each Fiber Section before the onset of reamination. Reamination was also evaluated after high-speed treadmill running with or without inhibition of reamination by hadacidin. Runnin...

  • IMP reamination to AMP in rat skeletal muscle Fiber types.
    The American journal of physiology, 1996
    Co-Authors: P. C. Tullson, P. G. Arabadjis, K. W. Rundell, R. L. Terjung
    Abstract:

    Inosine 5'-monophosphate (IMP) reamination in skeletal muscle Fiber Sections of the rat hindlimb was studied. High IMP concentrations were established during ischemic contractions in each Fiber Section: 3.1, 2.8, or 0.6 mumol/g in the fast-twitch white (FTW), fast-twitch red (FTR), and slow-twitch red (STR) muscle Sections, respectively. Thereafter blood flow was restored and stimulation was discontinued to allow reamination of IMP. After 0, 2, 5, 10, 15, or 20 min of recovery, muscle Sections were freeze-clamped and analyzed for metabolite contents. IMP was nearly fully reaminated after 10 and 20 min of recovery in STR and FTR muscles, respectively. Reamination in TW Fibers was delayed and slower, with only 50% of the IMP reaminated after 20 min of recovery. Significant recovery (approximately 75%) of phosphocreatine occurs in each Fiber Section before the onset of reamination. Reamination was also evaluated after high-speed treadmill running with or without inhibition of reamination by hadacidin. Running resulted in large accumulations of IMP in FTW and FTR Fibers (3.5 and 1.4 mumul/g, respectively); IMP in FTR Fibers was higher with hadacidin treatment. Reamination after running was much greater in FTR than in FTW Fibers and was associated with recovery of phosphocreatine. After running, the purine degradation products inosine and hypoxanthine were increased in FTW and FTR Fibers in normal and hadacidin-treated animals. Plasma inosine, hypoxanthine, and urate increased after exercise; concentrations continued to increase if reamination was inhibited by hadacidin. These results demonstrate that when muscle IMP is increased, subsequent degradation and loss of purines occur. Rapid reamination should minimize the quantity of purine lost from muscle and limit the metabolic cost of replenishing purines by the de novo synthesis or salvage pathways.

  • Triacylglycerol synthesis in the different skeletal muscle Fiber Sections of the rat.
    The American journal of physiology, 1996
    Co-Authors: L Budohoski, J Gorski, K Nazar, H Kaciuba-uscilko, R. L. Terjung
    Abstract:

    Triacylglycerol (TG) synthesis rates of low-oxidative fast-twitch white and high-oxidative fast- and slow-twitch red skeletal muscle Fiber Sections of adult rats were measured by the incorporation of perfusate-derived palmitate into the neutral lipid fraction by use of a perfused hindquarter preparation under high-flow conditions. The perfusion medium consisted of 95% O2-5% CO2 Krebs-Henseleit buffer, pH 7.4, containing 5 g/100 ml bovine serum albumin, 100 microU/ml insulin, 5 mmol/l glucose, amino acids, and added fatty acids (FA), including 0.1 microCi/ml [3H]palmitate. FA incorporation was linear with time. TG synthesis rates correlated (r > or = 0.90) with the oxidative capacity of each of the different Fiber type Sections and increased in proportion to the perfusate FA concentration (0.25, 0.5, 1.0, 1.5, and 2.0 mmol/l). TG synthesis rates among different muscle Fiber Sections were related (r > or = 0.90) to perfusate flow during high-flow conditions; however, this was not causal, because TG synthesis rates within each muscle Fiber Section were independent of flow rate when experimentally varied over an approximately threefold range. Thus the relatively high TG synthesis rates observed in the high-oxidative muscle Sections are not uniquely related to their high-flow capacities but are inherent to the TG synthesis process, probably events associated with FA uptake and/or capacity of the TG synthesis pathway.

Rogério Nogueira - One of the best experts on this subject based on the ideXlab platform.

  • Strain Sensitivity Enhancement of a Sensing Head Based on ZEONEX Polymer FBG in Series With Silica Fiber
    Journal of Lightwave Technology, 2018
    Co-Authors: Ricardo Oliveira, Cristiano M. B. Cordeiro, Lúcia Bilro, Thiago H. R. Marques, Rogério Nogueira
    Abstract:

    This study presents the use of a sensing device composed of an all ZEONEX-480R polymer Fiber Bragg grating, in series with a silica Fiber, for the control/enhancement of the strain sensitivity. The results show that the amount of strain imposed in the total gauge length is unequally distributed in each Fiber Section. The low Young's modulus and diameter of the polymer Fiber employed, compared to the silica one, leads to a higher strain density in the former. Additionally, the control of the length of each Fiber Section plays also an important role on the distribution of strain in each Fiber. Theoretical results show that higher strain sensitivities are easier to achieve for short and long polymer and silica Fiber lengths, respectively. Experimental characterization of a sensing head composed by a 2.6 cm polymer optical Fiber and different lengths of silica Fiber, led us to control and improve the strain sensitivity of the sensing device.

Lúcia Bilro - One of the best experts on this subject based on the ideXlab platform.

  • Strain Sensitivity Control of an In-Series Silica and Polymer FBG
    Sensors, 2018
    Co-Authors: Ricardo Oliveira, Lúcia Bilro, Rogerio N Nogueira
    Abstract:

    This work reports on the use of an in-series silica and polymer Fiber Bragg grating (FBG) to control the FBG strain sensitivities and enhance in the case of the polymer Fiber Bragg grating (PFBG). Due to differences in the Young’s Modulus of the Fibers employed, the amount of strain is unequally distributed in each Fiber Section. By acting on the silica Fiber length, it was possible to control the strain sensitivity of the two FBGs, allowing a polymer FBG strain sensitivity much higher than the one found in the elementary Fiber to be obtained. The influence of the diameter of the polymer Fiber on the strain sensitivities of the FBGs was also investigated. Results have shown that, besides the strain sensitivity control, an even greater improvement in the PFBG strain sensitivity can be achieved.

  • Strain Sensitivity Enhancement of a Sensing Head Based on ZEONEX Polymer FBG in Series With Silica Fiber
    Journal of Lightwave Technology, 2018
    Co-Authors: Ricardo Oliveira, Cristiano M. B. Cordeiro, Lúcia Bilro, Thiago H. R. Marques, Rogério Nogueira
    Abstract:

    This study presents the use of a sensing device composed of an all ZEONEX-480R polymer Fiber Bragg grating, in series with a silica Fiber, for the control/enhancement of the strain sensitivity. The results show that the amount of strain imposed in the total gauge length is unequally distributed in each Fiber Section. The low Young's modulus and diameter of the polymer Fiber employed, compared to the silica one, leads to a higher strain density in the former. Additionally, the control of the length of each Fiber Section plays also an important role on the distribution of strain in each Fiber. Theoretical results show that higher strain sensitivities are easier to achieve for short and long polymer and silica Fiber lengths, respectively. Experimental characterization of a sensing head composed by a 2.6 cm polymer optical Fiber and different lengths of silica Fiber, led us to control and improve the strain sensitivity of the sensing device.

Gerald Farrell - One of the best experts on this subject based on the ideXlab platform.

  • Light Coupling Between a Singlemode- Multimode-Singlemode (SMS) Fiber Structure and a Long Period Fiber Grating
    Journal of Lightwave Technology, 2011
    Co-Authors: Yuliya Semenova, Pengfei Wang, Tuan Guo, Long Jin, Gerald Farrell
    Abstract:

    We propose a novel optical coupling technique based on evanescent field coupling between a singlemode- multimode-singlemode (SMS) Fiber structure and a long period Fiber grating (LPFG). By parallel placement of the two Fiber Sections in close proximity to each other, the excited multi-cladding modes from the SMS Fiber Section can be selectively coupled to the guided mode in the LPFG, and vice versa. A theoretical analysis based for such a structure is undertaken and the simulated results are verified by experiments demonstrating a maximum coupling efficiency of up to 1.66% (which could be improved to 27.5% in theory) over a broadband resonance (42 nm with a 3 dB bandwidth).