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Journal articles on the topic 'Rotational loss'

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Author: Grafiati

Published: 14 March 2023

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1

Li, Jingsong, Lixiang Wang, Qingxin Yang, Shanming Wang, Yongjian Li, Changgeng Zhang, and Baojun Qu. "Measurement and modelling of rotational anomalous loss considering skin effect of electrical steel sheets." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 6 (November 6, 2017): 1750–58. http://dx.doi.org/10.1108/compel-12-2016-0576.

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Purpose Due to existence of skin effect under rotational excitation, especially to high-frequency motors and power transformers run at the frequency of hundreds or even thousands of hertz, core losses will increase significantly, which may cause local overheating damage, and the efficiency and longevity will be decreased. The purpose of this paper is to accurately calculate the rotational anomalous loss in electrical steel sheets. Design/methodology/approach The influence of skin effect to rotational anomalous loss coefficient is described in detail. Based on the rotational core losses calculation approach, the transformed coefficient and parameters of rotational anomalous loss are determined in accordance with experimental data obtained by using 3D magnetic properties testing system. Then, a variable loss coefficient calculation model of rotational anomalous loss is built. Meanwhile, a separation of the total 2D elliptical rotation experimental core losses is worked out. Findings The two methods are analysed and compared qualitatively. It should be noted that the novel calculation model can be more effectively presented anomalous loss features. Moreover, quantitative comparisons between 2D elliptical rotation and alternating core losses have achieved beneficial conclusions. Originality/value Transformed rotational anomalous loss coefficient and parameters of electrical steel sheets considering skin effect are determined. Based on that, a novel calculation model evaluating 2D elliptical rotation anomalous loss is presented and verified based on the experimental measurement and the separation of the total 2D elliptical rotation core losses. The 2D elliptical rotation core losses separation method and quantitative comparison with alternating excitation are helpful to engineering application.

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2

Maeder, André, and Georges Meynet. "Evolution of Massive Stars with Rotation and Mass Loss." Symposium - International Astronomical Union 215 (2004): 500–509. http://dx.doi.org/10.1017/s0074180900196093.

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Rotation appears as a dominant effect in massive star evolution. It largely affects all the model outputs: inner structure, tracks, lifetimes, isochrones, surface compositions, blue to red supergiant ratios, etc. At lower metallicities, the effects of rotational mixing are larger; also, more stars may reach critical velocity, even if the initial distribution of rotational velocities is the same.

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3

Enokizono, M., T. Suzuki, and J. D. Sievert. "Measurement iron loss using rotational magnetic loss measurement apparatus." Journal of the Magnetics Society of Japan 14, no. 2 (1990): 455–58. http://dx.doi.org/10.3379/jmsjmag.14.455.

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4

Tutukov, A. V., and A. V. Fedorova. "Rotational mass loss by Be stars." Astronomy Reports 47, no. 10 (October 2003): 826–30. http://dx.doi.org/10.1134/1.1618994.

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5

Nencib, N., A. Kedous-Lebouc, and B. Cornut. "2D analysis of rotational loss tester." IEEE Transactions on Magnetics 31, no. 6 (1995): 3388–90. http://dx.doi.org/10.1109/20.490391.

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6

Enokizono, M., T. Suzuki, and J. D. Sievert. "Measurement of Iron Loss Using Rotational Magnetic Loss Measurement Apparatus." IEEE Translation Journal on Magnetics in Japan 6, no. 6 (June 1991): 508–14. http://dx.doi.org/10.1109/tjmj.1991.4565198.

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7

Shi, Jianwei, Abdul Ghaffar, Yongwei Li, Irfan Mehdi, Rehan Mehdi, Fayaz A. Soomro, Sadam Hussain, Mujahid Mehdi, Qiang Li, and Zhiqiang Li. "Dynamic Rotational Sensor Using Polymer Optical Fiber for Robot Movement Assessment Based on Intensity Variation." Polymers 14, no. 23 (November 28, 2022): 5167. http://dx.doi.org/10.3390/polym14235167.

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A complex signal processing technique is usually required to process the data in most sensor design structures, and integration into real applications is also challenging. This work presents a dynamic rotational sensor using polymethyl methacrylate (PMMA) fiber for robot movement assessment. The sensor design structure is based on the coupling of light intensity, in which two PMMA fibers are twisted together. Both fibers are bent after twisting and attached on the linear translation stage, which is further attached to the robot. The variation in bending radius causes the bending loss, and that loss is coupled in the second fiber. The change in the macro-bend radius corresponds to the rotation of the robot. Experimental results indicate that the sensor can operate in full rotational cycle (i.e., 0°–360°) as well as for clock and anti-clockwise rotation. Moreover, different rotational speeds (2°/s, 3°/s, 5°/s, and 10°/s) were carried out. The hysteresis loss of the sensor was about 0.77% and the sensitivity was 8.69 nW/°. The presented dynamic rotational sensor is cost-effective and easily integrated into the robot structure to analyze the robot’s circular motion.

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8

Masaie, I., K. Demachi, T. Ichihara, and M. Uesaka. "Rotational Loss Modeling in Superconducting Magnetic Bearing." IEEE Transactions on Applied Superconductivity 16, no. 2 (June 2006): 1807–10. http://dx.doi.org/10.1109/tasc.2005.864309.

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9

Akiror, Jemimah C., John Wanjiku, Pragasen Pillay, Julian Cave, and Arezki Merkhouf. "Rotational Core Loss Magnetizer: Design and Measurements." IEEE Transactions on Industry Applications 54, no. 5 (September 2018): 4355–64. http://dx.doi.org/10.1109/tia.2018.2844844.

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10

Enokizono, M., T. Suzuki, J. Sievert, and J. Xu. "Rotational power loss of silicon steel sheet." IEEE Transactions on Magnetics 26, no. 5 (1990): 2562–64. http://dx.doi.org/10.1109/20.104798.

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11

Birnbaum, Florian, Thomas Reinhard, Daniel B�hringer, and Rainer Sundmacher. "Endothelial cell loss after autologous rotational keratoplasty." Graefe's Archive for Clinical and Experimental Ophthalmology 243, no. 1 (April 7, 2004): 57–59. http://dx.doi.org/10.1007/s00417-004-0902-2.

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12

Lei Ma, M. Sanada, S. Morimoto, and Y. Takeda. "Prediction of iron loss in rotating machines with rotational loss included." IEEE Transactions on Magnetics 39, no. 4 (July 2003): 2036–41. http://dx.doi.org/10.1109/tmag.2003.812706.

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13

Ji, Kuizhou, Yaoming Li, Zhenwei Liang, Yanbin Liu, Junhui Cheng, Hanhao Wang, Ruiheng Zhu, Shengbo Xia, and Guoqiang Zheng. "Device and Method Suitable for Matching and Adjusting Reel Speed and Forward Speed of Multi-Crop Harvesting." Agriculture 12, no. 2 (February 1, 2022): 213. http://dx.doi.org/10.3390/agriculture12020213.

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In order to meet the requirements of multi-crop harvesting, reduce the loss of harvesting, and improve the quality of harvesting, the device and method of matching and adjusting the rotation speed and forward speed of the pulling reel were designed. On the premise of satisfying the matching regulation, the parameters of the rotary wheel and the cutting table were adjusted so that the rotational speed ratio λ of the harvest crop was in the suitable range of the rotational speed ratio of the crop. The speed ratio was designed as a suitable interval of different crops by experiments and experience, and, in order to meet the requirements, it was designed to optimize the wheel speed. The speed-matching was designed, and through the experiments on the wheel-speed-adjustment error, which was less than 2%, it was designed to meet the design requirements. Crop-harvesting experiments were carried out under rotational speed-matching and a random speed, and the experimental results showed that the loss rate under rotational speed-matching was significantly lower than that under random speeds; the tests showed that the wheel speed designed with speed-matching can effectively reduce the loss rate.

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14

Tan, K., A. Datta, P. Flanders, and C. Graham. "Rotational loss in thin gage soft magnetic materials." IEEE Transactions on Magnetics 21, no. 5 (September 1985): 1921–23. http://dx.doi.org/10.1109/tmag.1985.1064105.

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15

Dupré, L. R., F. Fiorillo, C. Appino, A. M. Rietto, and J. Melkebeek. "Rotational loss separation in grain-oriented Fe–Si." Journal of Applied Physics 87, no. 9 (May 2000): 6511–13. http://dx.doi.org/10.1063/1.372754.

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Kitzberger, Martin, Gerd Bramerdorfer, Dietmar Andessner, Gereon Goldbeck, and Wolfgang Amrhein. "Design of a rotational iron loss measurement system." tm - Technisches Messen 85, no. 4 (April 25, 2018): 233–43. http://dx.doi.org/10.1515/teme-2017-0098.

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AbstractThis article is about the design of a measurement system for measuring iron losses in soft magnetic composites under controlled circular flux density patterns. With conventional measurement setups for iron loss determination, material samples are usually magnetized along a single spatial direction. However, in some parts of electrical machines magnetization loci over time substantially divert from the patterns used during conventional alternating loss measurements. Based on previous findings, iron losses strongly depend on the actual two dimensional magnetization locus over time. Therefore, the measurement with alternating magnetization cannot fully reflect the magnetizing conditions and iron losses present during machine operation. Available data especially for soft magnetic composites (SMC) regarding rotational losses is very limited. Hence, in this article a new measurement setup for the investigation of iron losses under controlled circular flux density loci was designed. It turns out, that iron losses show a significant deviation when comparing alternating and rotational losses with regard to the flux density magnitude and frequency.

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17

Enokizono, M., and I. Tanabe. "Studies on a new simplified rotational loss tester." IEEE Transactions on Magnetics 33, no. 5 (1997): 4020–22. http://dx.doi.org/10.1109/20.619649.

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18

Nell, Martin Marco, Benedikt Schauerte, Tim Brimmers, and Kay Hameyer. "Simulation of iron losses in induction machines using an iron loss model for rotating magnetization loci in no electrical steel." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 41, no. 2 (January 5, 2022): 600–614. http://dx.doi.org/10.1108/compel-06-2021-0220.

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Purpose Various iron loss models can be used for the simulation of electrical machines. In particular, the effect of rotating magnetic flux density at certain geometric locations in a machine is often neglected by conventional iron loss models. The purpose of this paper is to compare the adapted IEM loss model for rotational magnetization that is developed within the context of this work with other existing models in the framework of a finite element simulation of an exemplary induction machine. Design/methodology/approach In this paper, an adapted IEM loss model for rotational magnetization, developed within the context of the paper, is implemented in a finite element method simulation and used to calculate the iron losses of an exemplary induction machine. The resulting iron losses are compared with the iron losses simulated using three other already existing iron loss models that do not consider the effects of rotational flux densities. The used iron loss models are the modified Bertotti model, the IEM-5 parameter model and a dynamic core loss model. For the analysis, different operating points and different locations within the machine are examined, leading to the analysis of different shapes and amplitudes of the flux density curves. Findings The modified Bertotti model, the IEM-5 parameter model and the dynamic core loss model underestimate the hysteresis and excess losses in locations of rotational magnetizations and low-flux densities, while they overestimate the losses for rotational magnetization and high-flux densities. The error is reduced by the adapted IEM loss model for rotational magnetization. Furthermore, it is shown that the dynamic core loss model results in significant higher hysteresis losses for magnetizations with a high amount of harmonics. Originality/value The simulation results show that the adapted IEM loss model for rotational magnetization provides very similar results to existing iron loss models in the case of unidirectional magnetization. Furthermore, it is able to reproduce the effects of rotational flux densities on iron losses within a machine simulation.

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Painter, K. M., D. L. Young, D. M. Granatstein, and D. J. Mulla. "Combining alternative and conventional systems for environmental gains." American Journal of Alternative Agriculture 10, no. 2 (June 1995): 88–96. http://dx.doi.org/10.1017/s0889189300006214.

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AbstractTwo conventional cropping systems (winter wheat/dry peas and winter wheat/spring barley/dry peas) in the dryland grain region of southeastern Washington were compared with several alternative systems regarding profitability and environmental impacts. Two of the alternative systems use green manure crops and have low fertilizer and pesticide requirements. The remaining two are otherwise conventional rotations modified to include soil-building crops, bluegrass seed and rapeseed.Estimates of annual off-site erosion damage ranged from $6.56 to $20.50 per rotational acre, while on-site damage estimates ranged from $0.50 to $1.55 per rotational acre. Estimated leaching losses of pesticides to a water table 3.6 feet deep were negligible, but significant leaching losses of nitrate-N were predicted to occur from fall-applied inorganic fertilizer.Including bluegrass in a conventional grain rotation increased estimated net returns over variable costs by 16% and decreased soil loss by 33% compared with the most profitable conventional rotation. The next most profitable alternative system, rapeseed plus a conventional grain rotation, had slightly higher net returns over variable costs than the second most profitable conventional rotation, with slightly less soil loss. When fixed costs of machinery depreciation and land are included, the alternative systems fared relatively better. An experimental wheat/pea/medic system had higher projected net returns over total costs than the most profitable conventional rotation, while averaging just one-third as much soil loss per year. A wheat/barley/sweetclover green manure rotation was similar in profitability to the less profitable conventional rotation, but had only two-thirds as much soil loss.We constructed a mixed-integer linear programming model to determine the profitmaximizing combination of conventional and alternative rotations under 1990 farm bill provisions. Planting all or nearly all land to the bluegrass plus conventional grain rotation maximized returns over total costs for high, medium, and low program crop price scenarios. Farmers maximized profit by participating in both the wheat and barley programs under the low price scenario, only in the wheat program with moderate prices, and in neither the wheat nor the barley program under the high price scenario.

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20

Vlemmings, W. H. T., T. Khouri, E. De Beck, H. Olofsson, G. García-Segura, E. Villaver, A. Baudry, E. M. L. Humphreys, M. Maercker, and S. Ramstedt. "Rotation of the asymptotic giant branch star R Doradus." Astronomy & Astrophysics 613 (May 2018): L4. http://dx.doi.org/10.1051/0004-6361/201832929.

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High-resolution observations of the extended atmospheres of asymptotic giant branch (AGB) stars can now directly be compared to the theories that describe stellar mass loss. Using Atacama Large Millimeter/submillimeter Array (ALMA) high angular resolution (30 × 42 mas) observations, we have for the first time resolved stellar rotation of an AGB star, R Dor. We measure an angular rotation velocity of ωR sin i = (3.5 ± 0.3) × 10−9 rad s−1, which indicates a rotational velocity of |υrot sin i| = 1.0 ± 0.1 km s−1 at the stellar surface (R* = 31.2 mas at 214 GHz). The rotation axis projected on the plane of the sky has a position angle Φ = 7 ± 6°. We find that the rotation of R Dor is two orders of magnitude faster than expected for a solitary AGB star that will have lost most of its angular momentum. Its rotational velocity is consistent with angular momentum transfer from a close companion. As a companion has not been directly detected, we suggest R Dor has a low-mass, close-in companion. The rotational velocity approaches the critical velocity, set by the local sound speed in the extended envelope, and is thus expected to affect the mass-loss characteristics of R Dor.

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Liu, Yang, Yanli Zhang, Dexin Xie, and Baodong Bai. "Simplified analysis of iron loss in three-phase transformer considering rotating loss." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 1/2 (December 20, 2013): 74–84. http://dx.doi.org/10.1108/compel-11-2012-0331.

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Purpose – A simplified method for calculating iron loss of three-phase transformer is proposed in this paper. The rotating iron loss measured from 2-D vector magnetic property measurement system of gain-oriented silicon steel sheet can be taken into account in this method. The paper aims to discuss these issues. Design/methodology/approach – The finite element analysis formulation is combined with the magnetic reluctivity model expressed by diagonal tensor for 2-D nonlinear and anisotropic magnetic problem, while the iron loss is computed in terms of the interpolation of rotational loss curves measured under various loci of controlled magnetic flux density B. Findings – The iron loss of three-phase transformer is obtained by the proposed method. And the calculating iron loss is verified with experimental results. Originality/value – The method presented in this paper enables the iron loss of three-phase transformer to be more accurately calculated and more easily applied, considering the rotational iron loss.

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22

Gagnier, D., M. Rieutord, C. Charbonnel, B. Putigny, and F. Espinosa Lara. "Evolution of rotation in rapidly rotating early-type stars during the main sequence with 2D models." Astronomy & Astrophysics 625 (May 2019): A89. http://dx.doi.org/10.1051/0004-6361/201832581.

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The understanding of the rotational evolution of early-type stars is deeply related to that of anisotropic mass and angular momentum loss. In this paper, we aim to clarify the rotational evolution of rapidly rotating early-type stars along the main sequence (MS). We have used the 2D ESTER code to compute and evolve isolated rapidly rotating early-type stellar models along the MS, with and without anisotropic mass loss. We show that stars with Z = 0.02 and masses between 5 and 7 M⊙ reach criticality during the main sequence provided their initial angular velocity is larger than 50% of the Keplerian one. More massive stars are subject to radiation-driven winds and to an associated loss of mass and angular momentum. We find that this angular momentum extraction from the outer layers can prevent massive stars from reaching critical rotation and greatly reduce the degree of criticality at the end of the MS. Our model includes the so-called bi-stability jump of the Ṁ − Teff relation of 1D-models. This discontinuity now shows up in the latitude variations of the mass-flux surface density, endowing rotating massive stars with either a single-wind regime (no discontinuity) or a two-wind regime (a discontinuity). In the two-wind regime, mass loss and angular momentum loss are strongly increased at low latitudes inducing a faster slow-down of the rotation. However, predicting the rotational fate of a massive star is difficult, mainly because of the non-linearity of the phenomena involved and their strong dependence on uncertain prescriptions. Moreover, the very existence of the bi-stability jump in mass-loss rate remains to be substantiated by observations.

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Maeder, André. "New models of massive and Wolf-Rayet stars with mass loss and rotation." Symposium - International Astronomical Union 193 (1999): 177–86. http://dx.doi.org/10.1017/s0074180900205287.

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We give results of models of massive stars which have a detailed physical treatment of rotation, including structural equations for shellular rotation, new treatments of shears in differentially rotating stars and of meridional circulation, together with mass loss rates depending on rotation. For a 20 M⊙ star, He- and N-enrichments at the stellar surface already occur during the MS phase for moderately low rotational velocities, thus most supergiants are enriched in helium and nitrogen. A long B- and A-supergiant phase results from rotational mixing, with some primary nitrogen formed at this stage. For the most massive stars, rotation makes the star to enter the WR stage during the MS phase thus avoiding the LBV and red supergiant stage.The WR life-times are considerably increased by rotation and the minimum mass for forming WR stars is lowered. Interestingly enough, the increase of the WN life-time is larger than for WC stars, so that rotation leads to a decrease of the WC/WN number ratio. Also, the fraction of transition WN/WC stars is much larger at higher rotation.Finally, on the basis of clusters in the SMC, in the LMC and towards the galactic interior and exterior, we show that for clusters with ages between about 1 and 3 x 107 yr the fraction of Be stars with respect to normal B stars is larger at lower metallicities. This may suggest a higher rotation at lower metallicities for massive stars, due to a different history of star formation.

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Maeder, André, and Georges Meynet. "The role of rotation and mass loss in the evolution of massive stars." Symposium - International Astronomical Union 212 (2003): 267–74. http://dx.doi.org/10.1017/s0074180900212321.

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Rotation affects all the outputs of the evolution and nucleosynthesis of massive stars. We discuss the evolution of the rotational velocities, the internal ω-gradients, the tracks in the H-R diagram, the age determinations, the evolution of the surface N/C abundance ratios, the B/R number ratios of blue to red supergiants and the lifetimes in the WR stages.

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Nierla, Michael, Manfred Kaltenbacher, and Stefan Johann Rupitsch. "Computation of rotational hysteresis losses by vector Preisach models based on rotational operators." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 41, no. 3 (February 1, 2022): 981–95. http://dx.doi.org/10.1108/compel-02-2021-0061.

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Purpose A major purpose of vector hysteresis models lies in the prediction of power losses under rotating magnetic fields. The well-known vector Preisach model by Mayergoyz has been shown to well predict such power losses at low amplitudes of the applied field. However, in its original form, it fails to predict the reduction of rotational power losses at high fields. In recent years, two variants of a novel vector Preisach model based on rotational operators have been published and investigated with respect to general accuracy and performance. This paper aims to examine the capabilities of the named vector Preisach models in terms of rotational hysteresis loss calculations. Design/methodology/approach In a first step, both variants of the novel rotational operator-based vector Preisach model are tested with respect to their overall capability to prescribe rotational hysteresis losses. Hereby, the direct influence of the model-specific parameters onto the computable losses is investigated. Afterward, it is researched whether there exists an optimized set of parameters for these models that allows the matching of measured rotational hysteresis losses. Findings The theoretical investigations on the influence of the model-specific parameters onto the computable rotational hysteresis losses showed that such losses can be predicted in general and that a variation of these parameters allows to adapt the simulated loss curves in both shape and amplitude. Furthermore, an optimized parameter set for the prediction of the named losses could be retrieved by direct matching of simulated and measured loss curves. Originality/value Even though the practical applicability and the efficiency of the novel vector Preisach model based on rotational operators has been proven in previous publications, its capabilities to predict rotational hysteresis losses has not been researched so far. This publication does not only show the general possibility to compute such losses with help of the named vector Preisach models but also in addition provides a routine to derive an optimized parameter set, which allows an accurate modeling of actually measured loss curves.

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Dravins, Dainis. "Spectroscopic Measurements of Stellar Rotation." Highlights of Astronomy 10 (1995): 403–6. http://dx.doi.org/10.1017/s1539299600011540.

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This section title is identical to that of the first paper where the broadening of absorption lines in response to stellar rotation was discussed: Abney (1877).More accurate measurements now reveal also the details of stellar line shapes, making it possible to segregate the signatures of rotational and other broadening mechanisms: e.g. Gray (1992) and Smith & Gray (1976). To determine the rotation, fits can be made to line profiles (e.g. Anders et al., 1993), to their Fourier transforms (e.g. Dravins et al. 1990;Smith & Gray 1976), or to extended spectral regions (e.g. Kurucz et al. 1977).This review, however, concerns issues for [single-epoch] spectroscopic observations only, no temporal aspect will be discussed.What is observed is a rotationally broadened profile, the accuracy begins to get limited by the incomplete physical understanding of stellarline profiles and of the nature of stellar rotation. In order to disentangle the rotational broadening from other effects, one needs to know the ‘intrinsic’ (i.e. rotationally unbroadened) profile of the non-rotating star. How does this profile change with latitude and longitude across the stellar disk? What effects besides rotation are broadening the lines? What about mass loss, radial pulsation, non-radial oscillations, magnetic fields, spots, etc.? And the star might not even rotate as a rigid body, but perhaps differentially with respect to latitude and/or atmospheric height. All this has to be deduced from the often blended lines in complex spectra.

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Wardiningrum, Aprilia Dila, Agus Dharmawan, Soni Sisbudi Harsono, and Siswoyo Soekarno. "Rancang Bangun dan Uji Kinerja Mesin Pembersihan dan Pengayakan Tipe-Grizzly Untuk Beras." Rona Teknik Pertanian 14, no. 2 (October 30, 2021): 65–75. http://dx.doi.org/10.17969/rtp.v14i2.20741.

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Abstrak. Penelitian ini bertujuan untuk mengembangkan mesin pembersih dan pengayak tipe grizzly untuk beras sekaligus menguji kinerja mesin. Penelitian terdiri atas perancangan, perakitan, dan evaluasi kinerja mesin. Mesin yang dikembangkan memiliki 6 (enam) komponen utama, yaitu sumber dan transmisi tenaga putar, lubang pemasukan, unit pembersih beras, unit pengayak beras, lubang pengeluaran, dan kerangka mesin. Penelitian dilakukan menggunakan 3 (tiga) percobaan putaran, L (lambat), S (sedang), dan C (cepat) untuk mendapatkan data dari parameter pengukuran seperti kapasitas kerja, kecepatan putar mesin, laju isapan udara pada unit pembersih, slip putaran puli, dan persentase kehilangan bahan. Pada percobaan putaran L-S-C, yaitu 1654, 1817, dan 1979 rpm, menghasilkan laju isapan udara adalah 7,04, 7,79, dan 8,50 m/s. Slip putaran puli terjadi pada pulli 4 dengan nilai 3,27% tanpa sampal dan 1,70% dengan sampel; puli ini bertugas untuk menggetarkan ayakan grizzly 10-mesh. Kapasitas kerja pada 3 percobaan putaran (L-S-C) berturut-turut adalah 78,5, 81,6 dan 146,7 kg/jam. Pemisahan optimal dedak terjadi para percobaan putaran C sendangkan pemisahan menir terjadi pada percobaan L. Persentase kehilangan bahan tertinggi terjadi selama terjadi penurunan kecepatan putar yang mengakibatkan penurunan efektivitas kerja mesin.Design and Performance Test of Cleaning and Gryzzly-Type Sieving Machine for Rice Abstract. This research aimed to develop and a rice cleaning and grizzly-type sieving machine which also evaluates its performance. It consisted of designing, assembling, and performance evaluating of the machine. The desired machine was developed in six main components, i.e., power source, hopper, rice cleaner, rice siever, outlets, and machine frame. The research used three rotational speed treatments (Slow-Middle-Fast or L-S-C rotations) for data collections, whereas the parameters of performance testing consisted of work capacity, engine rotation speed, airflow rate, pulley rotational slip, and grain loss percentage. Engine rotation speeds at L-S-C treatments are 1654, 1817, and 1979 rpm and resulted in 7.04, 7.79, and 8.50 m/s, respectively, for airflow rates produced by the suction from a blower. The most significant rotational slip is occurred at Pulley-4 resulted in 3.27% (operating without samples) and 1.70% (operating with samples); this pulley transmitted rotational power to vibrate the 10-mesh grizzly sieve. The work capacities at L-S-C rotational treatments were 78.5, 81.6, and 146.7 kg/h, respectively. The optimal separation of brans was at C-rotational treatment, while the optimal separation of groats was at L-rotational treatment. The high percentage of grain loss occurred along with a reduction in speed that made the machine work ineffectively.

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Maeng, D. J., J. S. Lee, R. Jakoby, S. Kim, and S. Wittig. "Characteristics of Discharge Coefficient in a Rotating Disk System." Journal of Engineering for Gas Turbines and Power 121, no. 4 (October 1, 1999): 663–69. http://dx.doi.org/10.1115/1.2818523.

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The discharge coefficient of a long orifice in a rotating system is measured to examine the rotational effect on discharge behavior. The rotating system is comprised of a rotating disk and two stators on both sides of the rotating disk. Test rig is constructed to simulate the real turbine operating conditions. Pressure ratios between upstream and downstream cavities of the orifice range from 1.05 to 1.8, and rotational speed of the rotor disk is varied up to 10,000 rpm. The orifice hole bored through the rotor disk has length-to-diameter ratio of 10. For a better interpretation of discharge behavior, three-dimensional velocity field in the downstream and upstream cavities of the rotor is measured using a Laser Doppler Velocimetry. A new definition of the rotational discharge coefficient is introduced to consider the momentum transfer from the rotor to the orifice flow. Additional loss in the discharge coefficient due to pressure loss in the orifice hole at the inlet and exit regions is quantitatively presented in terms of the Rotation number and the compressibility factor. The effect of corner radiusing at the orifice inlet is also investigated at various rotational conditions.

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Kim, Yeol-oh, Yoon-ju Jo, Si-hyun Kim, and Kyue-nam Park. "Shoulder Pain and Rotational Range of Motion of the Trunk, Shoulder, and Hip in Baseball Players." Journal of Athletic Training 54, no. 11 (November 1, 2019): 1149–55. http://dx.doi.org/10.4085/1062-6050-203-18.

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Context Deficient glenohumeral rotational range of motion (ROM) is a risk factor for shoulder pain. Adapted ROM of the trunk and hip in response to loss of glenohumeral ROM has been suggested, as the nature of baseball leads to ROM adaptations. Objective To compare the bilateral rotational ROM values of the trunk and glenohumeral and hip joints in adolescent baseball players with or without shoulder pain and to measure the correlation between shoulder-pain intensity and bilateral rotational ROM values for each body area. Design Cross-sectional study. Setting Research laboratory. Patients or Other Participants Ninety-five adolescent baseball players (60 with shoulder pain, 35 without shoulder pain). Main Outcome Measure(s) Bilateral trunk rotation and internal rotation, external rotation, and total rotation of the dominant and nondominant glenohumeral and hip joints. Results Glenohumeral and hip ROM did not differ between groups, and pain intensity and rotational ROM were not related in either joint. Trunk rotational ROM was greater in the pain group than in the control group (dominant side = 48.8° ± 14.2° versus 41.8° ± 11.9°, respectively; nondominant side = 45.1° ± 14.2° versus 38.9° ± 7.7°, respectively; P values < .05), although the difference was clinically small (mean differences = 7.0° ± 2.7° [95% confidence interval = 1.7, 12.4] on the dominant side, P = .01, and 6.1° ± 2.7° [95% confidence interval = 0.8, 11.5] on the nondominant side, P = .03). Positive but low correlations in all players (ρ = 0.27, P = .01) and in those with shoulder pain (ρ = 0.36, P = .001) were present between shoulder-pain intensity and trunk rotational ROM toward the dominant side. Conclusions We found no clinical relationship between shoulder pain and rotational ROM and no clinical differences in rotational ROM values between players with and those without shoulder pain.

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Au, Brigham, Marissa Daniels Jamieson, and Rahul Banerjee. "Rotational Osteoplasty for Femoral Head Fracture With Cartilage Loss." Orthopedics 36, no. 1 (January 1, 2013): e105-e108. http://dx.doi.org/10.3928/01477447-20121217-27.

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Akiror, Jemimah C., R. Sudharshan Kaarthik, John Wanjiku, Pragasen Pillay, and Arezki Merkhouf. "Closed-Loop Control for a Rotational Core Loss Tester." IEEE Transactions on Industry Applications 54, no. 6 (November 2018): 5888–96. http://dx.doi.org/10.1109/tia.2018.2854270.

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32

Abdulfattah Sharaf, Rania, and Rudrapathy Palaniappan. "Evaluation of balance function in patients with radiologically (CT scan) confirmed otosclerosis." Biomedical Research and Therapy 6, no. 3 (March 29, 2019): 3034–39. http://dx.doi.org/10.15419/bmrat.v6i3.526.

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Objective: To assess balance function in patients with radiologically confirmed otosclerosis. Methods: Sixteen patients (14 females and 2 males), who attended the Neuro-Otology clinic/ ENT clinics at the Royal National Throat Nose and Ear Hospital, participated in this study. After general medical, audiological and Neuro-Otological examination, patients underwent the caloric and rotational testing. Results: Thirteen of the 16 patients had radiologically confirmed otosclerosis (12 females and 1 male). A total of 3 patients (2 females and 1 male) did not have CT confirmation of otosclerosis, and therefore, were excluded from the study. The remaining 13 patients' data were analyzed. Nine patients had a mixed hearing impairment at least on one side, while eight patients had a bilateral mixed hearing loss and one patient had a sensorineural hearing loss on one side. Four patients had a bilateral sensorineural hearing loss. Only 1 patient had a canal paresis (CP) at 35 %. None of the patients had any significant directional preponderance (DP). The patient with significant CP (35%) did not show any rotational asymmetry on impulsive rotation. Eleven patients had a rotational chair test. Only one patient had a significant asymmetry to the right at 25.30% (normal range is <20%). Overall, 18% (n = 2) of the radiologically confirmed otosclerosis patients showed an abnormal balance test, including both caloric and rotational tests. More than 80% (n = 9) of the patients with radiological otosclerosis showed balance symptoms. Conclusions: the current study indicates a high prevalence of balance symptoms (n = 9 or 82%) in patients with radiological otosclerosis, although only a small proportion (n = 2 or 18%) showed an abnormal vestibular function on caloric and impulse rotation testing. However, due to a small number of samples, further validation of this result is warranted.

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Ploegmakers, Joris, Bertram The, Allan Wang, Mike Brutty, and Tim Ackland. "Supination and Pronation Strength Deficits Persist at 2-4 Years after Treatment of Distal Radius Fractures." Hand Surgery 20, no. 03 (September 21, 2015): 430–34. http://dx.doi.org/10.1142/s0218810415500355.

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Forearm rotation is a key function in the upper extremity. Following distal radius fracture, residual disability may occur in tasks requiring forearm rotation. The objectives of this study are to define pronation and supination strength profiles tested through the range of forearm rotation in normal individuals, and to evaluate the rotational strength profiles and rotational strength deficits across the testing range in a cohort of patients treated for distal radius fracture associated with an ulnar styloid base fracture. In a normative cohort of 29 subjects the supination strength profile showed an increasing linear relationship from supination to pronation. Twelve subjects were evaluated 2-4 years after anatomical open reduction and volar plate fixation of a distal radius fracture. The injured wrist was consistently weaker (corrected for hand dominance) in both supination and pronation strength in all testing positions, with the greatest loss in 60 degrees supination. Mean supination strength loss across all testing positions was significantly correlated with worse PRWE scores, highlighting the importance of supination in wrist function.

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34

de Freitas, Daniel B., and J. R. De Medeiros. "A nonextensive approach for the angular momentum loss rate in low-mass stars." Proceedings of the International Astronomical Union 8, S294 (August 2012): 197–98. http://dx.doi.org/10.1017/s1743921313002494.

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AbstractThe present study demonstrates that behavior of rotational velocity as a function of stellar age is consistent using Tsallis' nonextensive formalism, resulting in a new approach to understanding the stellar rotational scenario.

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Enokizono, M., and J. D. Sievert. "Magnetic field and loss analysis in an apparatus for the determination of rotational loss." Physica Scripta 39, no. 3 (March 1, 1989): 356–59. http://dx.doi.org/10.1088/0031-8949/39/3/017.

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36

Jhala, Amit J., Hugh J. Beckie, Thomas J. Peters, A. Stanley Culpepper, and Jason K. Norsworthy. "Interference and management of herbicide-resistant crop volunteers." Weed Science 69, no. 3 (January 22, 2021): 257–73. http://dx.doi.org/10.1017/wsc.2021.3.

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AbstractSince the commercialization of herbicide-resistant (HR) crops, primarily glyphosate-resistant crops, their adoption has increased rapidly. Multiple herbicide resistance traits in crops such as canola (Brassica napus L.), corn (Zea mays L.), cotton (Gossypium hirsutum L.), and soybean [Glycine max (L.) Merr.] have become available in recent years, and management of their volunteers needs attention to prevent interference and yield loss in rotational crops. The objectives of this review were to summarize HR crop traits in barley (Hordeum vulgare L.), canola, corn, cotton, rice (Oryza sativa L.), soybean, sugarbeet (Beta vulgaris L.), and wheat (Triticum aestivum L.); assess their potential for volunteerism; and review existing literature on the interference of HR crop volunteers, yield loss, and their management in rotational crops. HR crop volunteers are problem weeds in agronomic cropping systems, and the impact of volunteerism depends on several factors, such as crop grown in rotation, the density of volunteers, management practices, and microclimate. Interference of imidazolinone-resistant (IR) barley or wheat volunteers can be a problem in rotational crops, particularly when IR crops such as canola or wheat are grown. HR canola volunteers are abundant in the Northern Great Plains due to high fecundity, seed loss before or during harvest, and secondary seed dormancy, and they can interfere in crops grown in rotation such as flax (Linum usitatissimum L.), field peas (Pisum sativum L.), and soybean. HR corn volunteers are competitive in crops grown in rotation such as corn, cotton, soybean, and sugarbeet, with yield loss depending on the density of HR corn volunteers. Volunteers of HR cotton, rice, soybean, and sugarbeet are not major concerns and can be controlled with existing herbicides. Herbicide options would be limited if the crop volunteers are multiple HR; therefore, recording the cultivar planted the previous year and selecting the appropriate herbicide are important. The increasing use of 2,4-D, dicamba, glufosinate, and glyphosate in North American cropping systems requires research on herbicide interactions and alternative herbicides or methods for controlling multiple HR crop volunteers.

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Xu, Zhongchao, Rujun Wu, and Wen Yang. "Eddy Current Magnetic Field Analysis of Disk Synchronous Magnetic Coupler." Journal of Physics: Conference Series 2355, no. 1 (October 1, 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2355/1/012016.

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Abstract Aiming at the problem that the eddy current loss generated by the metal isolation sleeve of the disc type synchronous magnetic coupler affects its transmission performance, this paper firstly deduces the equation of eddy current loss from the theory, then analyzes the influence of the difference in rotation angles and rotation speed on the eddy current loss, and also studies the influence of the induced magnetic field generated by the eddy current on the air gap magnetic field. Through simulation, it is concluded that: the smaller the difference in turning angle or the larger the rotational speed produces the greater eddy current loss; the influence of the induced magnetic field on the air gap magnetic field is different from different turning angles differences. The conclusion is of guiding significance to reduce the eddy current loss and improve the transmission performance of the magnetic coupler.

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Nishio, Hiroaki, Hitoshi Taguchi, Fumihiko Hirata, and Taku Takeishi. "Analysis of Rotational Hysteresis Loss for Sr-ferrite Fine Particles." Journal of the Japan Society of Powder and Powder Metallurgy 41, no. 6 (1994): 701–4. http://dx.doi.org/10.2497/jjspm.41.701.

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Enokizono, M., and J. D. Sievert. "Numerical analysis of accuracy of rotational magnetic loss measurement apparatus." Journal of the Magnetics Society of Japan 13, no. 2 (1989): 403–6. http://dx.doi.org/10.3379/jmsjmag.13.403.

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UESAKA, Mitsuru, Akira TAKESHITA, Yoshikatsu YOSHIDA, and Kenzo MIYA. "Fundamental Study on Rotational Loss in High Tc Superconducting Flywheel." TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 30, no. 11 (1995): 502–9. http://dx.doi.org/10.2221/jcsj.30.502.

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41

Enokizono, M., and J. D. Sievert. "Numerical Analysis of Accuracy of Rotational Magnetic Loss Measurement Apparatus." IEEE Translation Journal on Magnetics in Japan 5, no. 9 (September 1990): 742–48. http://dx.doi.org/10.1109/tjmj.1990.4564334.

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42

Hull, John R., Thomas M. Mulcahy, and Joseph F. Labataille. "Velocity dependence of rotational loss in Evershed-type superconducting bearings." Applied Physics Letters 70, no. 5 (February 3, 1997): 655–57. http://dx.doi.org/10.1063/1.118324.

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43

Cansiz, A., and J. R. Hull. "Stable Load-Carrying and Rotational Loss Characteristics of Diamagnetic Bearings." IEEE Transactions on Magnetics 40, no. 3 (May 2004): 1636–41. http://dx.doi.org/10.1109/tmag.2004.827181.

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44

Soeya, Susumu, Shin Nakamura, Takao Imagawa, and Shinji Narishige. "Rotational hysteresis loss study on exchange coupled Ni81Fe19/NiO films." Journal of Applied Physics 77, no. 11 (June 1995): 5838–42. http://dx.doi.org/10.1063/1.359164.

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Braun, Daniel, and Ulrich Weiss. "Rotational tunnelling and librational excitations: The loss of quantum coherence." Physica B: Condensed Matter 202, no. 3-4 (October 1994): 264–72. http://dx.doi.org/10.1016/0921-4526(94)90304-2.

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Nencib, N., A. Kedous-Lebouc, and B. Cornut. "3D analysis of a rotational loss tester with vertical yokes." Journal of Magnetism and Magnetic Materials 133, no. 1-3 (May 1994): 553–56. http://dx.doi.org/10.1016/0304-8853(94)90620-3.

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Alatawneh, Natheer, and Pragasen Pillay. "The Negative Value of Power in Rotational Core Loss Measurements." IEEE Transactions on Energy Conversion 30, no. 1 (March 2015): 410–12. http://dx.doi.org/10.1109/tec.2014.2337756.

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Enokizono, M., T. Todaka, T. Sashikata, J. D. Sievert, and H. Ahlers. "Magnetic field analysis of rotational loss tester with vertical yoke." Journal of Magnetism and Magnetic Materials 112, no. 1-3 (July 1992): 81–84. http://dx.doi.org/10.1016/0304-8853(92)91118-d.

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Yamada, Hayatoshi, Hiroaki Nagashima, Yukihiko Sakashita, Wataru Mikami, Manabu Okamur, and Shigeya Tanimoto. "Rotational Core Loss of Induction Motor by Finite Element Method." Electrical Engineering in Japan 103, no. 3 (October 8, 2007): 75–82. http://dx.doi.org/10.1002/eej.4391030310.

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Eislöffel, Jochen, and Alexander Scholz. "The rotation of very low-mass stars and brown dwarfs." Proceedings of the International Astronomical Union 3, S243 (May 2007): 241–48. http://dx.doi.org/10.1017/s174392130700960x.

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AbstractThe evolution of angular momentum is a key to our understanding of star formation and stellar evolution. The rotational evolution of solar-mass stars is mostly controlled by magnetic interaction with the circumstellar disc and angular momentum loss through stellar winds. Major differences in the internal structure of very low-mass stars and brown dwarfs – they are believed to be fully convective throughout their lives, and thus should not operate a solar-type dynamo – may lead to major differences in the rotation and activity of these objects. Here, we report on observational studies to understand the rotational evolution of the very low-mass stars and brown dwarfs.

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