Temperature dependence of conduction noise of MgB2 superconductor

Singh, Davinder; Khare, Neeraj; Shekhar, Chandra; Srivastava, O. N.

doi:10.1016/j.physc.2008.02.002

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Terkait permasalahan yang ditemukan di lapangan ini, maka urgensi penelitian terhadap kualitas air di DI Kali Metro menjadi sangat tinggi. Hal ini dikarenakan kualitas air irigasi yang dipakai untuk mengairi lahan pertanian sama pentingnya dengan tingkat kesuburan tanah (Singh & Khare, 2008). Penilaian kualitas air irigasi dapat ditentukan berdasarkan tingkat bahaya salinitas, tingkat bahaya alkalinitas, dan tingkat bahaya toksisitasnya (Khan et al, 2014).…”

Section: Pendahuluanunclassified

Penilaian Spasio-Temporal Kualitas Air Irigasi di Daerah Irigasi Kali Metro, Jawa Timur, Indonesia

Amik,

Soetopo,

Siswoyo

2023

Agro. Bali. Agric. J.

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Daerah Irigasi Kali Metro mendapatkan suplai air dari Sungai Metro melalui bangunan utama yaitu Bendung Mergan. Berdasarkan hasil survei di lapangan, diketahui bahwa kondisi air di Sungai Metro saat ini tidak hanya berasal dari mata airnya melainkan juga sudah tercampur dengan limbah domestik. Tujuan dilaksanakannya penelitian ini adalah untuk menilai kualitas air irigasi secara spasio-temporal dan kesesuaiannya dengan tanah dan tanaman pada lahan pertanian di Daerah Irigasi Kali Metro. Penilaian kualitas air irigasi dilakukan dengan menggunakan Model Indeks Kualitas Air Irigasi. Nilai indeks kualitas air irigasi di lokasi penelitian baik secara spasial maupun secara temporal berada pada rentang 70–85. Air irigasi dapat diberikan pada lahan pertanian dengan kondisi permeabilitas tanah sedang dan tidak untuk diberikan pada tanaman- tanaman yang sensitif terhadap garam.

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Section: Pendahuluanunclassified

Penilaian Spasio-Temporal Kualitas Air Irigasi di Daerah Irigasi Kali Metro, Jawa Timur, Indonesia

Amik,

Soetopo,

Siswoyo

2023

Agro. Bali. Agric. J.

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Frequency and Voltage Dependence of Dielectric Loss of MgB2 Composites at Different Temperatures

Korucu

Ertekin

Belenli

et al. 2012

J Supercond Nov Magn

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Dual stage resistive transition of MgB2 evidenced by noise analysis

Andreoli¹,

Carbone²,

Mazzetti³

et al. 2011

Journal of Applied Physics

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The resistive transition of polycrystalline superconducting MgB2 films is studied by means of an extensive set of stationary noise measurements, going from the very beginning of the transition to its final point, where the normal state is reached, either with and without magnetic field. The experimental results, taken at low current density and close to the critical temperature Tc, show very clearly the existence of two different dissipative processes at the different stages of the transition. An extended analysis proves that, at the beginning of the transition, when the resistance is below ten percent of normal value, the specimen is in a mixed state and dissipation is produced by fluxoid creation and motion. At higher temperature the specimen is in an intermediate state, constituted by a structure of interleaved superconducting and resistive domains. Such a situation occurs in type II superconductor when the transition temperature is very near to Tc and the critical field Hc for fluxoid penetration tends to zero. It is found that in the intermediate state, the power spectrum of the relative resistance fluctuations, is independent of the average resistance value and is unaffected by the magnetic field. As shown in the paper, this means that the noise is generated by density fluctuation of the normal electron gas in the resistive domains, while the contribution of the superconducting ones is negligible. The reduced noise amplitude does not depend on the steepness of the transition curve, thus adding further evidence to the above interpretation. The noise is thus related to the film impurities and can be investigated when the specimen is in the normal state, even at room temperature. The occurrence of a different dissipative process at low resistance is clearly evidenced by the experimental results, which show that the amplitude of the reduced power spectrum of the noise depends on magnetic field and resistance. These results are consistent with the assumption of fluxoid noise as shown by the model for the calculation of the noise developed in the manuscript.

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Temperature dependence of conduction noise of MgB2 superconductor

Cited by 3 publications

References 25 publications

Penilaian Spasio-Temporal Kualitas Air Irigasi di Daerah Irigasi Kali Metro, Jawa Timur, Indonesia

Penilaian Spasio-Temporal Kualitas Air Irigasi di Daerah Irigasi Kali Metro, Jawa Timur, Indonesia

Frequency and Voltage Dependence of Dielectric Loss of MgB2 Composites at Different Temperatures

Dual stage resistive transition of MgB2 evidenced by noise analysis

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