2,065 research outputs found

    Harmonic analysis of irradiation asymmetry for cylindrical implosions driven by high-frequency rotating ion beams

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    Cylindrical implosions driven by intense heavy ions beams should be instrumental in a near future to study High Energy Density Matter. By rotating the beam by means of a high frequency wobbler, it should be possible to deposit energy in the outer layers of a cylinder, compressing the material deposited in its core. The beam temporal profile should however generate an inevitable irradiation asymmetry likely to feed the Rayleigh-Taylor instability (RTI) during the implosion phase. In this paper, we compute the Fourier components of the target irradiation in order to make the junction with previous works on RTI performed in this setting. Implementing a 1D and 2D beam models, we find these components can be expressed exactly in terms of the Fourier transform of the temporal beam profile. If TT is the beam duration and Ω\Omega its rotation frequency, "magic products" ΩT\Omega T can be identified which cancel the first harmonic of the deposited density, resulting in an improved irradiation symmetry.Comment: 19 pages, 8 figures, to appear in PR

    Crystal structure of 3-{(E)-[(3, 4-dichloro-phenyl)imino]methyl}benzene-1, 2-diol

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    The authors acknowledge the provision of funds for the purchase of diffractometer and encouragement by Dr.Muhammad Akram Chaudhary, Vice Chancellor, University of Sargodha, Pakistan.Peer reviewedPublisher PD

    EAST: Energy Efficient Adaptive Scheme for Transmission in Wireless Sensor Networks

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    In this paper, we propose Energy-efficient Adaptive Scheme for Transmission (EAST) in WSNs. EAST is IEEE 802.15.4 standard compliant. In this approach, open-loop is used for temperature-aware link quality estimation and compensation. Whereas, closed-loop feedback helps to divide network into three logical regions to minimize overhead of control packets on basis of Threshold transmitter power loss (RSSIloss) for each region and current number of neighbor nodes that help to adapt transmit power according to link quality changes due to temperature variation. Simulation results show that propose scheme; EAST effectively adapts transmission power to changing link quality with less control packets overhead and energy consumption compared to classical approach with single region in which maximum transmitter power assigned to compensate temperature variation

    Plasma induced energy deposition and radiation transport effects in ion beam heated plane metal targets and analytic solutions of the non-linear radiation conduction equation

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    The effects of microscopic energy deposition in hot, dense plasmas and radiation transport in plasmas, on the interaction of ion beams with plane metal targets are investigated in this paper. In order to do this we analyze the plasma dynamics of ablatively accelerated plane metal foils. The physical analysis of these results is achieved by the derivation of solutions of the non-linear radiation conduction equation with boundary temperatures which increase in time. We illustrate, by means of numerical simulations, how range shortening due to plasma effects such as increased energy loss to excited electrons and an increased effective charge due to a reduction in the recombination rate, may be compensated for by radiation transport. The effect of radiation transport and detailed microscopic energy deposition on ion beam implosions, including hydrodynamic instability, is discusse

    Physics of ablative Rayleigh–Taylor and Landau–Darrieus instabilities

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    Efketifitas Simpang Bersinyal Dengan Sistem Pengaturan Dua Fase Pada Jalan Utama Di Kota Palu (Studi Kasus: Simpang Samratulangi – Sudirman- Cik Ditiro- Haji Hayyun)

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    The growth of vehicle every year give impact to traffic intersection performance. The impact of trrafic such as vehicle queueing , traffic jam , rise in delay time and also increase travel time could be caused by traffic control system no effective because the increasing by traffic volumeThis research is conducted in one of Major Street in Palu, namely at Samratulangi – Sudirman Street street is the intersection between Hj. Hayyun – Cik Ditiro Street.In this research, the analyzed by using Manual Kapasitas Jalan Indonesia ( MKJI).From result of analysis by using MKJI , got intersection performance at condition of morning peak reside at service of level C with queue length is equal to 38,73, in the peak day has level of service F with queue length is equal to 65,04 m and afternoon peak with level of service E where the queueing length is 70,07 m. According to value of level of service on the this intersection had shown that traffic control system 2 (two) stage was not effective agai

    Evaluating tools to support a new practical classification of diabetes: excellent control may represent misdiagnosis and omission from disease registers is associated with worse control.

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    To conduct a service evaluation of usability and utility on-line clinical audit tools developed as part of a UK Classification of Diabetes project to improve the categorisation and ultimately management of diabetes

    The effect of transverse magnetic correlations on a coupled order parameter: shifted transition temperatures and thermal hysteresis

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    We use a Green's function method with Random Phase Approximation to show how magnetic correlations may affect electric polarization in multiferroic materials with magnetic-exchange-type magnetoelectric coupling. We use a model spin 1/2 ferromagnetic ferroelectric system but our results are expected to apply to multiferroic materials with more complex magnetic structures. In particular, we find that transverse magnetic correlations result in a change in the free energy of the ferroelectric solutions leading to the possibility for thermal hysteresis of the electric polarization above the magnetic Curie temperature. Although we are motivated by multiferroic materials, this problem represents a more general calculation of the effect of fluctuations on coupled order parameters
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