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Journal articles on the topic 'Concentric Reducer'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Subaschandar, N. "Computational Study of Fluid Flow Inside a Concentric Reducer." MATEC Web of Conferences 54 (2016): 11001. http://dx.doi.org/10.1051/matecconf/20165411001.

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2

Sang, Z. F., and G. E. O. Widera. "Stress and Strength Analysis of Concentric Reducers Consisting of Plates." Journal of Pressure Vessel Technology 110, no. 2 (1988): 217–24. http://dx.doi.org/10.1115/1.3265592.

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This paper presents a new kind of piping component—a concentric reducer consisting of plates. Authors performed experimental and elastic, elastic-plastic analyses on five test models having different structural parameters. The elastic stress distribution under hydraulic test pressure, the extension of the plastic region under higher than operating loads and the results of bursting tests are also reported on. Results indicate that under test pressure the maximum stress occurs at the inside of the junction area between the small end of the reducer and the small end tube. Yield and final burst al

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Singh, C. D., S. K. Dhua, M. Kumar, et al. "Metallurgical Investigation of a Prematurely Failed Concentric Reducer Tube Used in a Hot-Rolling Mill." Journal of Failure Analysis and Prevention 7, no. 4 (2007): 292–301. http://dx.doi.org/10.1007/s11668-007-9048-y.

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Ulfah, Nurul, Rahman Hakim, and Michael Tri Adelitho. "Rancang Bangun Jig & Fixture Untuk Pipe Fitting Steel Concentric Reducer Pada Mesin Bevel Pipa." Jurnal Poli-Teknologi 19, no. 2 (2020): 145–50. http://dx.doi.org/10.32722/pt.v19i2.2742.

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Pang, Seung-Ki, and Hye-Rin Ahn. "Evaluation of Flow Characteristics in Water Supply Pipes Shielding Electromagnetic Pulse of 100 dB with Concentric and Eccentric Reducers." Transactions of the Korea Society of Geothermal Energy Engineers 13, no. 1 (2017): 1–6. http://dx.doi.org/10.17664/ksgee.2017.13.1.001.

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Deev, A. V., T. Rasheed, M. C. Welsh, M. M. K. Khan, and M. G. Rasul. "Measurement of instantaneous flow velocities in a concentric reducer using Particle Image Velocimetry: Study of scale deposition." Experimental Thermal and Fluid Science 33, no. 6 (2009): 1003–11. http://dx.doi.org/10.1016/j.expthermflusci.2009.05.001.

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7

Aghaei-Lasboo, Anahita, Katherine Inoyama, Adam S. Fogarty, et al. "Tripolar concentric EEG electrodes reduce noise." Clinical Neurophysiology 131, no. 1 (2020): 193–98. http://dx.doi.org/10.1016/j.clinph.2019.10.022.

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Kay, Anthony D., and Anthony J. Blazevich. "Concentric muscle contractions before static stretching minimize, but do not remove, stretch-induced force deficits." Journal of Applied Physiology 108, no. 3 (2010): 637–45. http://dx.doi.org/10.1152/japplphysiol.01135.2009.

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The effects of concentric contractions and passive stretching on musculotendinous stiffness and muscle activity were studied in 18 healthy human volunteers. Passive and concentric plantar flexor joint moment data were recorded on an isokinetic dynamometer with simultaneous electromyogram (EMG) monitoring of the triceps surae, real-time motion analysis of the lower leg, and ultrasound imaging of the Achilles-medial gastrocnemius muscle-tendon junction. The subjects then performed six 8-s ramped maximal voluntary concentric contractions before repeating both the passive and concentric trials. Co

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9

Lee, Dae-Young, Jongwoo Kim, Ji-Suk Kim, et al. "Anisotropic Patterning to Reduce Instability of Concentric-Tube Robots." IEEE Transactions on Robotics 31, no. 6 (2015): 1311–23. http://dx.doi.org/10.1109/tro.2015.2481283.

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10

Banks, R. E., and W. K. R. Musgrave. "The operation of concentric-tube distillation columns under reduced pressure." Journal of Applied Chemistry 6, no. 5 (2007): 214–18. http://dx.doi.org/10.1002/jctb.5010060504.

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11

Aagaard, P., E. B. Simonsen, J. L. Andersen, S. P. Magnusson, J. Halkjær-Kristensen, and P. Dyhre-Poulsen. "Neural inhibition during maximal eccentric and concentric quadriceps contraction: effects of resistance training." Journal of Applied Physiology 89, no. 6 (2000): 2249–57. http://dx.doi.org/10.1152/jappl.2000.89.6.2249.

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Despite full voluntary effort, neuromuscular activation of the quadriceps femoris muscle appears inhibited during slow concentric and eccentric contractions. Our aim was to compare neuromuscular activation during maximal voluntary concentric and eccentric quadriceps contractions, hypothesizing that inhibition of neuromuscular activation diminishes with resistance training. In 15 men, pretraining electromyographic activity of the quadriceps muscles [vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF)] was 17–36% lower during slow and fast (30 and 240°/s) eccentric and slow conc

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12

Bortoletto, M., C. Rodella, R. Salvador, P. C. Miranda, and C. Miniussi. "Reduced Current Spread by Concentric Electrodes in Transcranial Electrical Stimulation (tES)." Brain Stimulation 9, no. 4 (2016): 525–28. http://dx.doi.org/10.1016/j.brs.2016.03.001.

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13

Li, Cheng Yu, and Yao Jie Guo. "Mechanical Behavior of Concrete Filled Steel Tubular out Stiffener Ring Connections with Reduced Beam Section." Advanced Materials Research 243-249 (May 2011): 865–70. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.865.

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The past study indicates that, when the space joint of concentric annular-stiffer is loaded, stress concentration may generate at corner. The destruction usually concentrates in the joint region, and then cannot generate “strong joint”. To change this unfavorable characteristic, the reduced beam section connection is adopted. Through oriented reducing beam section, the plastic region is formed, which can achieve the aim of “weak beam, strong joint”. After the simulation and analysis to space joints on outer concentric annular-stiffer which are processed by reduced beam section, the loading con

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14

Taber, Christopher B., Jared R. Morris, John P. Wagle, and Justin J. Merrigan. "Accentuated Eccentric Loading in the Bench Press: Considerations for Eccentric and Concentric Loading." Sports 9, no. 5 (2021): 54. http://dx.doi.org/10.3390/sports9050054.

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This study examined the effects of accentuated eccentric loading (AEL) on bench press velocities across a spectrum of concentric and eccentric loads. Ten strength trained men (bench press one-repetition maximum (1-RM): 124.3 ± 19.4 kg; relative strength ratio: 1.5 ± 0.2 kg∙body mass−1) participated. Subjects completed bench press repetitions using concentric loads from 30% to 80% 1-RM in 10% increments in each experimental session. The AEL protocols were implemented using 100% (AEL100) and 110% 1-RM (AEL110) loads during the eccentric action, while the eccentric load remained the same as the c

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Kay, Anthony D., and Anthony J. Blazevich. "Isometric contractions reduce plantar flexor moment, Achilles tendon stiffness, and neuromuscular activity but remove the subsequent effects of stretch." Journal of Applied Physiology 107, no. 4 (2009): 1181–89. http://dx.doi.org/10.1152/japplphysiol.00281.2009.

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The effects of isometric contractions and passive stretching on muscle-tendon mechanics and muscle activity were studied in 16 healthy human volunteers. First, peak concentric and passive ankle joint moment data were recorded on an isokinetic dynamometer with electromyographic monitoring of the triceps surae; real-time motion analysis of the lower leg and ultrasound imaging of the Achilles-medial gastrocnemius muscle-tendon junction were simultaneously conducted. Second, the subjects performed six 8-s maximal voluntary isometric contractions (MVICs) before repeating the passive and active tria

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Bai, Yun Shan, Yi Jiang, and Dong Mo Zhou. "Analysis of Concentric Canister Wall Roughness Effect on Jet Flow Based on Fluid Dynamics." Applied Mechanics and Materials 252 (December 2012): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.252.3.

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Adopting concentric canister launchers (CCL), high temperature and high pressure environment of CCL is unfavorable for the missile launch. In addition to the gap between internal canister and external canister, injecting water for cooling are the main factor of impact the canister flow field, CCL’s rough wall is also a very important influence factor. In this paper, under the two working conditions of rough wall and smooth wall, use dynamic layering manner of moving mesh update method to simulate concentric canister missile launch process. The results reveal that rough wall has a great influen

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17

Kang, Seok Hee, Yong Cheol Shin, Eun Young Hwang, et al. "Engineered “coffee-rings” of reduced graphene oxide as ultrathin contact guidance to enable patterning of living cells." Materials Horizons 6, no. 5 (2019): 1066–79. http://dx.doi.org/10.1039/c8mh01381k.

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The generation of ultrathin nanotextured films in the form of micropatterns (i.e., concentric gradient rGO coffee rings) is effectively tailored, and these patterned rGO arrays can be utilized as promising cell-responsive templates.

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18

Zhang, Li, Yong-Chang Jiao, and Bo Chen. "Optimization of Concentric Ring Array Geometry for 3D Beam Scanning." International Journal of Antennas and Propagation 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/625437.

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Optimization of the element placement in a concentric ring array for three-dimensional (3D) beam scanning with minimum peak sidelobe levels (SLLs) is addressed in this paper. In order to achieve 3D beam scanning with the lowest peak SLL, both the radius and the element spacing of each ring are optimized. Moreover, the aperture size is a very important constraint for the array, since there is an upper limit for the aperture size of a given array in real-life environment. Hence, in our optimization design, the maximum radius of the concentric ring array is constrained. Through the optimization,

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19

Burigo, Ricardo Lima, Robson Dias Scoz, Bruno Mazziotti de Oliveira Alves, et al. "Concentric and eccentric isokinetic hamstring injury risk among 582 professional elite soccer players: a 10-years retrospective cohort study." BMJ Open Sport & Exercise Medicine 6, no. 1 (2020): e000868. http://dx.doi.org/10.1136/bmjsem-2020-000868.

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Background/AimDifferent authors have tried to correlate the peak isokinetic torque values with the incidence of soccer match injuries. However, due to the wide variety of assessment testing protocols, such an inference becomes difficult. This study aimed to verify the capacity of an isokinetic test to establish injury risk reference values for hamstring strain injuries.MethodsA retrospective cohort study based on isokinetic data and clinical records from the last 10 years was conducted in 582 Brazilian elite-professional soccer players, who were subjected to the same isokinetic test protocol,

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20

Fedorova, N. N., and M. M. Habibulina. "Evaluation of hormonal balance indicators in men with arterial hypertension in various types of left ventricular remodeling." Kazan medical journal 97, no. 3 (2016): 323–27. http://dx.doi.org/10.17750/kmj2016-323.

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Aim. To evaluate features of the hormonal balance in men with hypertension with different types of left ventricular geometry.Methods. The study included 63 men (mean age 49.74±4.91 years) with II degree hypertension (the disease duration 6.03±3.64 years). In all patients the level of testosterone, estradiol, prolactin, thyroid-stimulating hormone in blood serum were determined and echocardiography was performed, which was done on the expert class machine PHILIPS iE33 (Netherlands).Results.. According to echocardiographic examination data concentric hypertrophy prevailed in the left ventricular

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21

Iltaf, Asim, Massab Junaid, Fahd N. khan, and Azhar Hussain. "Microstructure, mechanical properties, residual stresses and texture analysis of Ti-5Al-2.5Sn alloy weldments obtained using electron beam of different oscillation patterns." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 17 (2020): 3484–96. http://dx.doi.org/10.1177/0954406220916550.

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Electron beam welding was used for welding of Ti-5Al-2.5Sn alloy using three types of beam oscillation patterns, i.e. elliptical, concentric circles and arrow shape waveform. The influence of these patterns on microstructure, mechanical properties and residual stresses was investigated using optical microscopy, electron back scattered diffraction, scanning electron microscopy, microhardness measurement, residual stress measurement, impact testing, smooth and notch tensile testing. A partial martensitic transformation was observed in the fusion zone of all the three welding patterns. The fusion

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22

Gates, Phillip E., Christopher L. Gentile, Douglas R. Seals, and Demetra D. Christou. "Adiposity Contributes to Differences in Left Ventricular Structure and Diastolic Function with Age in Healthy Men." Journal of Clinical Endocrinology & Metabolism 88, no. 10 (2003): 4884–90. http://dx.doi.org/10.1210/jc.2003-030673.

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Abstract We sought to examine the influence of adiposity in age-associated changes in the left ventricle (LV) in a cohort of 113 healthy men, aged 20–79 yr, by measuring LV structure and diastolic function (echocardiography), whole body composition, and regional adiposity (dual energy x-ray absorptiometry). Aging was associated with increased levels of adiposity, greater wall thickness to chamber radius ratio, LV concentric remodeling, and reduced LV diastolic function (all P &lt; 0.05). Bivariate correlation analysis showed that mean LV wall thickness, a concentric LV morphology, and dias

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23

Domínguez Cabrera, María del Pino. "El Registro Especial de Buques de Canarias." Revista Electrónica de Derecho de la Universidad de La Rioja (REDUR), no. 2 (November 5, 2018): 99. http://dx.doi.org/10.18172/redur.3850.

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Este trabajo aborda el estudio del Registro Especial de Buques y Empresas Navieras de Canarias (REBECA) como único segundo registro marítimo español. Se trata de un registro adicional al Registro Marítimo ordinario que reúne además las características de especial, público y administrativo, opcional, heterónomo, y selectivo. Más específicamente, concentra su atención en el objeto registral pues, como el título indica, se ocupa exclusivamente del Registro de Buques, pero no de la inscripción de las empresas marítimas o navieras, aunque la Ley de Puertos del Estado y de la Marina Mercante también

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24

Babault, Nicolas, Michel Pousson, Yves Ballay, and Jacques Van Hoecke. "Activation of human quadriceps femoris during isometric, concentric, and eccentric contractions." Journal of Applied Physiology 91, no. 6 (2001): 2628–34. http://dx.doi.org/10.1152/jappl.2001.91.6.2628.

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Maximal and submaximal activation level of the right knee-extensor muscle group were studied during isometric and slow isokinetic muscular contractions in eight male subjects. The activation level was quantified by means of the twitch interpolation technique. A single electrical impulse was delivered, whatever the contraction mode, on the femoral nerve at a constant 50° knee flexion (0° = full extension). Concentric, eccentric (both at 20°/s velocity), and isometric voluntary activation levels were then calculated. The mean activation levels during maximal eccentric and maximal concentric cont

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25

Kay, Anthony D., and Anthony J. Blazevich. "Moderate-duration static stretch reduces active and passive plantar flexor moment but not Achilles tendon stiffness or active muscle length." Journal of Applied Physiology 106, no. 4 (2009): 1249–56. http://dx.doi.org/10.1152/japplphysiol.91476.2008.

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The effects of static stretch on muscle and tendon mechanical properties and muscle activation were studied in fifteen healthy human volunteers. Peak active and passive moment data were recorded during plantar flexion trials on an isokinetic dynamometer. Electromyography (EMG) monitoring of the triceps surae muscles, real-time motion analysis of the lower leg, and ultrasound imaging of the Achilles-medial gastrocnemius muscle-tendon junction were simultaneously conducted. Subjects performed three 60-s static stretches before being retested 2 min and 30 min poststretch. There were three main fi

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Hernández-Davó, J. L., R. Sabido, M. Moya-Ramón, and A. J. Blazevich. "Load knowledge reduces rapid force production and muscle activation during maximal-effort concentric lifts." European Journal of Applied Physiology 115, no. 12 (2015): 2571–81. http://dx.doi.org/10.1007/s00421-015-3276-8.

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Andersen, Ole Emil, Ole Bækgaard Nielsen, and Kristian Overgaard. "Early effects of eccentric contractions on muscle glucose uptake." Journal of Applied Physiology 126, no. 2 (2019): 376–85. http://dx.doi.org/10.1152/japplphysiol.00388.2018.

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Muscle-damaging eccentric exercise impairs muscle glucose uptake several hours to days after exercise. Little, however, is known about the acute effects of eccentric exercise on contraction- and insulin-induced glucose uptake. This study compares glucose uptake rates in the first hours following eccentric, concentric, and isometric contractions with and without insulin present. Isolated rat extensor digitorum longus muscles were exposed to either an eccentric, concentric, or isometric contraction protocol, and muscle contractions were induced by electric stimulation that was identical between

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Chen, Hung Chien, Tzu Chen Hung, and Yi Feng Chen. "Numerical Analysis of Heat Transfer in the Concentric Heat Exchanger." Applied Mechanics and Materials 275-277 (January 2013): 572–75. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.572.

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The computational fluid dynamics (CFD) software is used to compute three-dimensional concentric heat exchanger in this research. In order to reduce the burden of the computational time, the concentric heat exchanger is simplified sector of 5° for the regular arrangement of internal shape. The working fluids for hot flow and cold flow are helium and molten salt individually. The arrangements for hot and cold flow paths within a heat exchanger is opposite. This study is mainly focused on the distribution of field for the two layers of concentric heat exchanger. The width of the flow channel as w

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Teertstra, Peter M., M. Michael Yovanovich, and J. Richard Culham. "Natural Convection Measurements for a Concentric Spherical Enclosure." Journal of Heat Transfer 128, no. 6 (2005): 580–87. http://dx.doi.org/10.1115/1.2188476.

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An experimental test program is described for the measurement of natural convection for an isothermal, heated sphere centrally located in an isothermal, cooled spherical enclosure. A transient test method is used in a reduced pressure environment to provide data for a wide range of Rayleigh number, from the limiting case of laminar boundary layer convection to the diffusive limit. Tests are performed using a fixed outer diameter for four different inner sphere diameters, resulting in diameter ratios in the range 1.5⩽do∕di⩽4.8. The data are in excellent agreement with the exact solution for the

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Perentis, Panagiotis A., Evgenia D. Cherouveim, Vassiliki J. Malliou, et al. "The Effects of High-Intensity Interval Exercise on Skeletal Muscle and Cerebral Oxygenation during Cycling and Isokinetic Concentric and Eccentric Exercise." Journal of Functional Morphology and Kinesiology 6, no. 3 (2021): 62. http://dx.doi.org/10.3390/jfmk6030062.

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The aim of the present study was to study the effects of cycling and pure concentric and pure eccentric high-intensity interval exercise (HIIE) on skeletal muscle (i.e., vastus lateralis) and cerebral oxygenation. Twelve healthy males (n = 12, age 26 ± 1 yr, body mass 78 ± 2 kg, height 176 ± 2 cm, body fat 17 ± 1% of body mass) performed, in a random order, cycling exercise and isokinetic concentric and eccentric exercise. The isokinetic exercises were performed on each randomly selected leg. The muscle and the cerebral oxygenation were assessed by measuring oxyhemoglobin, deoxyhemoglobin, tot

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Chen, Young Long, Yung Chi Chang, and Yu Ling Zeng. "An Opportunistic Large Array Concentric Geographic Routing Algorithm with a Relay Node in Wireless Sensor Networks." Applied Mechanics and Materials 764-765 (May 2015): 838–42. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.838.

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Wireless sensor networks (WSNs) are a group of wireless sensor nodes, those sensor nodes with sensing and monitoring of environmental information. Energy consumption is an important topic; the node's power is limited. Therefore, we proposed an Opportunistic Large Array Concentric Geographic Routing Algorithm (OLACGRA) to reduce the node’s energy consumption and analysis the characteristic of energy model. The sink position of our proposed OLACGRA is at the center of concentric topology architecture. The source node wants to transmit data that it needs to calculate the distance between source n

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Klein, Franziska J., Stephen Bell, K. Elisabeth Runte, et al. "Heart rate-induced modifications of concentric left ventricular hypertrophy: exploration of a novel therapeutic concept." American Journal of Physiology-Heart and Circulatory Physiology 311, no. 4 (2016): H1031—H1039. http://dx.doi.org/10.1152/ajpheart.00301.2016.

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Lowering the heart rate is considered to be beneficial in heart failure (HF) with reduced ejection fraction (HFrEF). In a dilated left ventricle (LV), pharmacological heart rate lowering is associated with a reduction in LV chamber size. In patients with HFrEF, this structural change is associated with better survival. HF with preserved ejection fraction (HFpEF) is increasingly prevalent but, so far, without any evidence-based treatment. HFpEF is typically associated with LV concentric remodeling and hypertrophy. The effects of heart rate on this structural phenotype are not known. Analogous w

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Zhai, Zhenfeng, Weifeng Ye, Fei Xia, and Lele Yang. "Analytical Solution for Wave Diffraction by a Concentric Three-Cylinder System near a Vertical Wall." Mathematics 9, no. 16 (2021): 1876. http://dx.doi.org/10.3390/math9161876.

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In this study, a semi-analytical model was developed to study wave diffraction around a concentric three-cylinder system near a wall based on linear potential theory. As a critical element, the target problem is transformed into bidirectional incident wave diffraction around two concentric structures based on the image principle and an analytical solution is obtained through eigenfunction expansion combined with a matching technique and Graf’s addition theorem. The validity of the proposed model was verified by comparing its results to known values. Parametric studies on porosity, annular spac

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Dey, Anupam, and Rajarshi Sanyal. "Single layer miniaturized ultra-thin FSS with five closely spaced bands." International Journal of Microwave and Wireless Technologies 11, no. 08 (2019): 797–805. http://dx.doi.org/10.1017/s1759078719000370.

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AbstractThis Paper reveals a novel single layer five band frequency selective surface (FSS). Novelties of the proposed FSS lie in its five closely spaced stop bands at 2.4, 3.38, 4.82, 6.32, and 7.75 GHz as well as the reduced single layer structural thickness (0.0016 λ0) and the miniaturized unit cell size (0.0656 λ0) at lower resonant frequency as compared to the existing multiband FSS. The unit cell structure consists of six octagonal concentric interconnected loops. Adjacent loop interconnection technique reduces the cell size by more than 44%. Furthermore, arrow-shaped rings are also intr

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Khan, Muhammad Ammar, Jing-Fu Bao, Fei-Hong Bao, and Xin Zhou. "Concentric Split Aluminum with Silicon-Aluminum Nitride Annular Rings Resonators." Micromachines 10, no. 5 (2019): 296. http://dx.doi.org/10.3390/mi10050296.

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This paper presents a novel approach of annular concentric split rings microelectromechanical resonators with tether configuration to reduce anchor loss and gives very high-quality factor (Q) 2.97 Million based on FEA (Finite Element Analysis) simulation. The operating frequencies of these resonators are 188.55 MHz to 188.62 MHz. When the proposed SR (square rectangle) hole shaped one dimensional phononic crystal (1D PnC), and two dimensional phononic crystal (2D PnC) structure consist of very wide and complete band gaps is applied to novel design rings MEMS resonators, the quality factor (Q)

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Hawkey, Adam, and Alexander Dallaway. "Application of acute whole-body vibration and lower-body exercise: effects on concentric torque in lower-limb muscles." Biomedical Human Kinetics 12, no. 1 (2020): 157–65. http://dx.doi.org/10.2478/bhk-2020-0020.

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SummaryStudy aim: With contrary evidence regarding the effectiveness of acute whole-body vibration training (WBVT) on sporting performance, the current study examined WBVT’s effect on concentric torque of the quadriceps (Q) and hamstrings (H).Material and methods: Following ethical approval, 11 male team sport players (age: 22.9 ± 3.3 yrs, height: 1.80 ± 0.07 m, mass: 82.5 ± 12.6 kg) completed three separate weekly WBVT sessions. Baseline and post – WBVT intervention measurements of Q and H concentric torque were recorded, using an isokinetic dynamometer, at each session. Isokinetic knee exten

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Doyle, J. A., W. M. Sherman, and R. L. Strauss. "Effects of eccentric and concentric exercise on muscle glycogen replenishment." Journal of Applied Physiology 74, no. 4 (1993): 1848–55. http://dx.doi.org/10.1152/jappl.1993.74.4.1848.

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Eccentric contractions appear to reduce muscle glycogen replenishment during the 1- to 10-day period after exercise. The main purpose of this study was to determine whether consuming a large amount of carbohydrate (1.6 g.kg-1.h-1) during the 4 h after glycogen-reducing exercise would produce different patterns of glycogen replenishment in human muscle that had undergone either eccentric or concentric contractions approximately 2 or 48 h earlier. Subjects cycled for 75 min and undertook interval exercise to deplete glycogen on days 1 and 3. After cycling exercise on day 1 only, subjects perform

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Chen, Kesong, Yafei Li, and Jiajia Shi. "Optimization of Sparse Concentric Ring Arrays for Low Sidelobe." International Journal of Antennas and Propagation 2019 (June 2, 2019): 1–8. http://dx.doi.org/10.1155/2019/1485075.

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To lower the peak sidelobe level (PSLL) of sparse concentric ring arrays, a method with multiple design constraints that embed a function model into modified real genetic algorithm (MGA) and select the grid ring radii as optimization individual to synthesize sparse concentric ring arrays is proposed. The multiple constraints include the array aperture, the minimum element spacing, and the number of elements. The proposed method dynamically calculates the ratio of element on each ring, and it has a faster convergence rate than other algorithms. The MGA uses real number to code the optimization

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Ramin, Keyvan, and Mahmoud R. Maheri. "The Seismic Investigation of Off-Diagonal Steel Braced RC Frames." Slovak Journal of Civil Engineering 26, no. 3 (2018): 49–64. http://dx.doi.org/10.2478/sjce-2018-0020.

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Abstract Steel bracing may be used to enhance the seismic strength of RC frames. Concentric steel bracing generally reduces ductility, which is a key component of seismic design. To overcome the problem, ductile steel brace-RC frame systems are therefore usually introduced in the form of eccentric braces. In the present study, the Off-Diagonal Bracing System (ODBS), which works as a concentric type of bracing, is investigated. In this paper the response of ODBS elements to cyclic loading is first explored and compared with those of other types of bracing such as X-bracing and inverted-V bracin

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Bliss, Donald B., David Raudales, and Linda P. Franzoni. "A study of multi-element/multi-path concentric shell structures to reduce noise and vibration." Journal of the Acoustical Society of America 135, no. 4 (2014): 2386. http://dx.doi.org/10.1121/1.4877888.

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Moreno-Azze, Alejandro, José Luis Arjol-Serrano, David Falcón-Miguel, Chris Bishop, and Oliver Gonzalo-Skok. "Comparison of Three Eccentric Overload Training Strategies on Power Output and Interlimb Asymmetry in Youth Soccer Players." International Journal of Environmental Research and Public Health 18, no. 16 (2021): 8270. http://dx.doi.org/10.3390/ijerph18168270.

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Background: The present study compared the effects of performing the lateral squat exercise in three different formats from eccentric overload training on concentric/eccentric peak/mean power and inter-limb asymmetries in young soccer players. Methods: Forty-five young male (U-17) soccer players were distributed into three groups. Two groups performed the same training volume with both legs, beginning with the weaker leg (SVW, n = 15) or with the stronger leg (SVS, n = 15). The third group executed double volume with the weaker leg and also commenced with such leg (DVW, n = 15) in the lateral

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Babault, Nicolas, Wacef Bazine, Gaëlle Deley, Christos Paizis, and Grégory Lattier. "Direct Relation of Acute Effects of Static Stretching on Isokinetic Torque Production With Initial Flexibility Level." International Journal of Sports Physiology and Performance 10, no. 1 (2015): 117–19. http://dx.doi.org/10.1123/ijspp.2013-0555.

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Purpose:To examine the acute effect of a single static-stretching session of hamstring muscles on torque production in relation with individual flexibility.Methods:Maximal voluntary concentric torque of hamstring muscles was measured before and after a static-stretching session (6 × 30 s). Torque changes were correlated with the flexibility level determined at the onset of the experimental procedure.Results:The hamstring-stretching intervention significantly reduced maximal concentric torque in participants with low and high hamstring flexibility. Hamstring flexibility and torque decrease, det

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De Ruiter, C. J., and A. De Haan. "Similar effects of cooling and fatigue on eccentric and concentric force-velocity relationships in human muscle." Journal of Applied Physiology 90, no. 6 (2001): 2109–16. http://dx.doi.org/10.1152/jappl.2001.90.6.2109.

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The purpose of this study was to investigate the effects of muscle temperature and fatigue during stretch (eccentric) and shortening (concentric) contractions of the maximally electrically activated human adductor pollicis muscle. After immersion of the lower arm in water baths of four different temperatures, the calculated muscle temperatures were 36.8, 31.6, 26.6, and 22.3°C. Normalized (isometric force = 100%) eccentric force increased with stretch velocity to maximal values of 136.4 ± 1.6 and 162.1 ± 2.0% at 36.8 and 22.3°C, respectively. After repetitive ischemic concentric contractions,

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Milandri, Giovanni, and Sudesh Sivarasu. "A Randomized Controlled Trial of Eccentric Versus Concentric Cycling for Anterior Cruciate Ligament Reconstruction Rehabilitation." American Journal of Sports Medicine 49, no. 3 (2021): 626–36. http://dx.doi.org/10.1177/0363546520987566.

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Background: Persistent strength and biomechanical deviations remain after anterior cruciate ligament reconstruction (ACLR). Eccentric training may reduce these and associated reinjury or osteoarthritis risks. Hypothesis: For male patients who have undergone ACLR, eccentric training is more effective than concentric training at improving knee flexion angle and other biomechanical deviations, as well as strength and patient-reported outcomes, using a matched perceived exertion dose. Study Design: Randomized controlled trial; Level of evidence, 1. Methods: A total of 26 men, 10-16 weeks after ham

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Sah, S., M. R. Tripathy, and A. Mittal. "Multiband and Miniaturized dual layer Antenna incorporated with FSS and DGS." Advanced Electromagnetics 7, no. 1 (2018): 1–6. http://dx.doi.org/10.7716/aem.v7i1.534.

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A novel dual layer rectangular printed Antenna based on loop type Frequency selective surfaces with five concentric rings and I shaped defected ground structure (DGS) is designed and investigated. The deigned antenna is tested for application in C band, WiFi devices and some cordless telephones and X band radiolocation, airborne and naval radars as multiband operational frequencies are at 5.5GHz, 6.81GHz, 9.3GHz and thus covers two wireless communication band C Band (4 to 8GHz ) and X band (8 to 12 GHz) The bandwidth is 200MHz, 300MHz and 1GHz respectively and measured gain of this designed an

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Hollman, David S., Henry F. Schaefer, and Edward F. Valeev. "Semi-exact concentric atomic density fitting: Reduced cost and increased accuracy compared to standard density fitting." Journal of Chemical Physics 140, no. 6 (2014): 064109. http://dx.doi.org/10.1063/1.4864755.

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Dib, Nihad. "Design of planar concentric circular antenna arrays with reduced side lobe level using symbiotic organisms search." Neural Computing and Applications 30, no. 12 (2017): 3859–68. http://dx.doi.org/10.1007/s00521-017-2971-2.

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Alekseev, Viktor. "Deep structure and geodynamic conditions of granitoid magmatism in the Eastern Russia." Journal of Mining Institute 243 (June 14, 2020): 259. http://dx.doi.org/10.31897/pmi.2020.3.259.

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We investigated the deep structure of the lithosphere and the geodynamic conditions of granitoid magmatism in the Eastern Russia within the borders of the Far Eastern Federal District. The relevance of the work is determined by the need to establish the geotectonic and geodynamic conditions of the granitoids petrogenesis and ore genesis in the Russian sector of the Pacific Ore Belt. The purpose of the article is to study the deep structure of the lithosphere and determine the geodynamic conditions of granitoid magmatism in the East of Russia. The author's data on the magmatism of ore regions,

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WENG, HUEI CHU, CHA'O-KUANG CHEN, and MIN-HSING CHANG. "Stability of micropolar fluid flow between concentric rotating cylinders." Journal of Fluid Mechanics 631 (July 17, 2009): 343–62. http://dx.doi.org/10.1017/s0022112009007150.

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In this study, the theory of micropolar fluids is employed to study the stability problem of flow between two concentric rotating cylinders. The field equations subject to no-slip conditions (non-zero velocity and microrotation velocity components) at the wall surfaces are solved. The analytical solutions of the velocity and microrotation velocity fields as well as the shear stress difference, couple stress and strain rate for basic flow are obtained. The equations with respect to non-axisymmetric disturbances are derived and solved by a direct numerical procedure. It is found that non-zero wa

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Lundberg, Tommy R., Rodrigo Fernandez-Gonzalo, and Per A. Tesch. "Exercise-induced AMPK activation does not interfere with muscle hypertrophy in response to resistance training in men." Journal of Applied Physiology 116, no. 6 (2014): 611–20. http://dx.doi.org/10.1152/japplphysiol.01082.2013.

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As aerobic exercise (AE) may interfere with adaptations to resistance exercise (RE), this study explored acute and chronic responses to consecutive AE (∼45 min cycling) and RE (4 × 7 maximal knee extensions) vs. RE only. Ten men performed acute unilateral AE + RE interspersed by 15 min recovery. The contralateral leg was subjected to RE. This exercise paradigm was then implemented in a 5-wk training program. Protein phosphorylation, gene expression, and glycogen content were assessed in biopsies obtained from the vastus lateralis muscle of both legs immediately before and 3 h after acute RE. Q

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