1,721,812 research outputs found
Related Data for: Late-Holocene sea-level markers preserved in a beach ridge system on Phra Thong Island, Thailand
No full text100 MHz ground penetrating radar (GPR) data were collected from Phra Thong Island, Thailand
Rediscovery of Morina ludlowii (Caprifoliaceae): An overlooked species from India
No full textKumar, Rahul, Krishna, Gopal, Kumar, Vikas (2023): Rediscovery of Morina ludlowii (Caprifoliaceae): An overlooked species from India. Phytotaxa 591 (2): 177-180, DOI: 10.11646/phytotaxa.591.2.10, URL: http://dx.doi.org/10.1094/PDIS-04-22-0755-PD
FIGURE 1 in A review of the species of Oreichthys (Teleostei: Cyprinidae) in the Western Ghats, India
No full textFIGURE 1. Map showing collection localities of Oreichthys from the Western Ghats: A, Nagara, Karnataka; B, Agumbe, Shimoga, Karnataka; C, Coorg, Karnataka; D, Mannarkkad, Kerala. Not to scale.Published as part of Marcus Knight, J. D. & Kumar, Rahul G., 2015, A review of the species of Oreichthys (Teleostei: Cyprinidae) in the Western Ghats, India, pp. 157-167 in Zootaxa 3914 (2) on page 158, DOI: 10.11646/zootaxa.3914.2.5, http://zenodo.org/record/23457
FIGURE 5. A in A review of the species of Oreichthys (Teleostei: Cyprinidae) in the Western Ghats, India
No full textFIGURE 5. A, Oreichthys cosuatis: Hamiton's manuscript drawing of Cyprinus cosuatis, reproduced by M'Clelland (1839: pl. 44 fig. 9). B, Oreichthys cosuatis from Nadia,West Bengal.Published as part of Marcus Knight, J. D. & Kumar, Rahul G., 2015, A review of the species of Oreichthys (Teleostei: Cyprinidae) in the Western Ghats, India, pp. 157-167 in Zootaxa 3914 (2) on page 164, DOI: 10.11646/zootaxa.3914.2.5, http://zenodo.org/record/23457
FIGURE 3 in A review of the species of Oreichthys (Teleostei: Cyprinidae) in the Western Ghats, India
No full textFIGURE 3. Oreichthys incognito sp. nov.: A, holotype, ZSI FF 5250, 31.4 mm SL. B, Live specimen from Kunthipuzha, Kerala, not preserved.Published as part of Marcus Knight, J. D. & Kumar, Rahul G., 2015, A review of the species of Oreichthys (Teleostei: Cyprinidae) in the Western Ghats, India, pp. 157-167 in Zootaxa 3914 (2) on page 162, DOI: 10.11646/zootaxa.3914.2.5, http://zenodo.org/record/23457
Exploring effective TET through a vibro-impact nonlinear energy sink over broad parameter regimes
No full textIn recent times, the vibro-impact nonlinear energy sink (VINES) has emerged as a promising passive mechanism for vibration mitigation in engineering systems. The VINES system consists of a ball traveling within a cavity of an externally excited linear oscillator (LO). The ball impacts either end of the cavity, transferring energy from the LO to the ball and mitigating excess oscillations of the LO. Earlier studies of VINES analyzed scenarios with the mass of the ball to be small relative to the LO, with low forcing amplitude near the resonant frequency of the LO. Improvements in targeted energy transfer (TET), observed for an increased mass of the ball, motivate an investigation of VINES for larger mass ratios, using a recently developed semi-analytical map-based approach that provides the exact solution without the limitations of previous analyses. Complementary analytical and numerical approaches treat larger mass ratios and higher amplitudes of the external harmonic excitation for forcing frequencies away from the natural frequency of the LO, identifying parameter regimes for efficient and inefficient performance based on standard measures of energy transfer. The analysis identifies multiple regions for the desired behavior with two alternating impacts per forcing period and provides relevant stability conditions. Numerical results indicate chattering behavior in regimes where energy transfer is minimal, yielding performance that appears similar to resonance. This phenomenon can be directly related to the passive nature of the VINES design, where the natural frequency of the VINES system decreases as the mass of the ball, and thus that of the system, increases. Then the peak response of the LO is shifted away from its resonant frequency, allowing excellent energy transfer to be realized there.</p
The identity of Rasbora neilgherriensis (Teleostei: Danionidae), with a redescription
No full textThampy, Dencin Rons, Kurian, Agin George, Devi, K. Rema, Kumar, Rahul G. (2020): The identity of Rasbora neilgherriensis (Teleostei: Danionidae), with a redescription. Zootaxa 4894 (2): 261-268, DOI: https://doi.org/10.11646/zootaxa.4894.2.
FIGURE 4 in The identity of Rasbora neilgherriensis (Teleostei: Danionidae), with a redescription
No full textFIGURE 4: Collection locations of Rasbora neilgherriensis in the Cauvery River Basin; collection data are given in Table 2.Published as part of Thampy, Dencin Rons, Kurian, Agin George, Devi, K. Rema & Kumar, Rahul G., 2020, The identity of Rasbora neilgherriensis (Teleostei: Danionidae), with a redescription, pp. 261-268 in Zootaxa 4894 (2) on page 267, DOI: 10.11646/zootaxa.4894.2.5, http://zenodo.org/record/431573
FEM based Assessment of Winding Inter-Tum Fault Indicators in Line Connected Induction Motors
No full textThe paper aims at the definition of proper indicators for the effective detection of stator inter-turn faults in line connected induction motors. The procedure uses a finite element model related to a standard medium rated motor, tuned taking into account both magnetic saturation and the actual winding scheme. After the experimental check with reference to different load conditions, multiple fault indicators are evaluated by elaborating the motor current components. The same model predicts the effects of asymmetric voltage supply on the current harmonics to prevent misleading fault detection. Moreover, a relation between fault severity and the experimental setup to reproduce similar current asymmetries as in the actual fault condition has been examined. On this basis, some measurements have been carried out, enabling to have a broad check on the fault indicator effectiveness
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Preferential Heating and Acceleration of Heavy Ions in Impulsive Solar Flares
Full text linkWe simulate decaying turbulence in a homogeneous pair plasma using a three-dimensional electromagnetic particle-in-cell method. A uniform background magnetic field permeates the plasma such that the magnetic pressure is three times larger than the thermal pressure and the turbulence is generated by counter-propagating shear Alfvén waves. The energy predominately cascades transverse to the background magnetic field, rendering the turbulence anisotropic at smaller scales. We simultaneously move several ion species of varying charge to mass ratios in our simulation and show that the particles of smaller charge to mass ratios are heated and accelerated to non-thermal energies at a faster rate. This is in accordance with the enhancement of heavy ions and a non-thermal tail in their energy spectrum observed in the impulsive solar flares. We further show that the heavy ions are energized mostly in the direction perpendicular to the background magnetic field, with a rate consistent with our analytical estimate of the rate of heating due to cyclotron resonance with the Alfvén waves, of which a large fraction is due to obliquely propagating waves
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