Browsing Department of Physics by Title

Browsing Department of Physics by Title

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  • Generation of low-frequency oscillations in the subsolar venus ionopause 
    Singh, R.N.; Upadhyay, H.O. (Springer India, 1989-10)
    The steep electron density gradient, the magnetic field curvature and the effect of gravity make the Venus ionopause region unstable. The onset of flute instability in the Venus ionopause plasma has been studied. The ...
  • Geographically Weighted Method Integrated with Logistic Regression for Analyzing Spatially Varying Accuracy Measures of Remote Sensing Image Classification 
    Mishra, V. N.; Kumar, V.; Prasad, R.; punia, M. (Springer, 2021-05)
    The accuracy of thematic information extracted from remote sensing image is assessed recurrently using the confusion matrix method. But the accuracies have been criticized as a consequence of its aspatial nature. The work ...
  • Geometric quenches in quasidisordered lattice systems 
    Kumar, Ravi; Modak, Ranjan (American Physical Society, 2022-06-01)
    While global quantum quench has been extensively used in the literature to understand the localization-delocalization transition for the one-dimensional quantum spin chain, the effect of geometric quench (which corresponds ...
  • Ghost diffraction: A spatial statistical approach 
    Unknown author (Elsevier B.V., 2023-02-01)
    We report a new method to reconstruct a two-dimensional object in Ghost diffraction scheme using a spatial statistical optics approach. This is implemented by using a static diffuser rather than a pseudo thermal light ...
  • Ghost diffraction: A spatial statistical approach 
    ., Manisha; Tiwari, Vipin; Bisht, Nandan S.; Das, Bhargab; Singh, Rakesh Kumar (Elsevier B.V., 2022-09-17)
    We report a new method to reconstruct a two-dimensional object in Ghost diffraction scheme using a spatial statistical optics approach. This is implemented by using a static diffuser rather than a pseudo thermal light ...
  • Global maps of the magnetic field in the solar corona 
    Yang, Z.; Bethge, C.; Tian, H.; Tomczyk, S.; Morton, R.; Del Zanna, G.; Del Zanna, S.W.; Karak, B.B.; Gibson, S.; Samanta, T.; He, J.; Chen, Y.; Wang, L. (American Association for the Advancement of Science, 2020-08-07)
    Understanding many physical processes in the solar atmosphere requires determination of the magnetic field in each atmospheric layer. However, direct measurements of the magnetic field in the Sun's corona are difficult to ...
  • Gravitational redshift and the vacuum index of refraction 
    Wilhelm, K.; Dwivedi, B.N. (Springer Netherlands, 2019-02-01)
    A physical process of the gravitational redshift was described in an earlier paper (Wilhelm and Dwivedi, New Astron. 31:8, 2014). This process did not require any information for the emitting atom neither on the local ...
  • Greenish-yellow emission from rare-earth free Li+ doped zinc vanadate phosphor 
    Chauhan, Vaibhav; Deshmukh, Pratik; Satapathy S.; Pandey, Praveen C. (Elsevier B.V., 2022-08)
    In this article, we present synthesis and spectral study of Zn(3-x)Lix(VO4)2 (x = 0, 0.01, 0.02, 0.03) samples. The orthorhombic phase of all the samples is validated by their XRD pattern. The crystallinity of Zn3(VO4)2 ...
  • High temperature impedance spectroscopy of barium stannate, BaSnO3 
    Upadhyay, Shail (Indian Academy of Sciences, 2012-07-14)
    Polycrystalline powder of BaSnO3 was prepared at 1300 °C using a high-temperature solid-state reaction technique. X-ray diffraction analysis indicated the formation of a single-phase cubic structure with lattice parameter: ...
  • High temperature spin-freezing transition in pyrochlore Eu2Ti2O7: A new observation from ac-susceptibility 
    Pal, Arkadeb; Singh, Abhishek; Ghosh, A.K.; Chatterjee, Sandip (Elsevier B.V., 2018-09-15)
    The magnetization (both dc and ac) of pyrochlore Eu2Ti2O7 have been investigated. Ac susceptibility (χ/ & χ//) measurements reveal a new unusual spin freezing below 35 K for pure Eu2Ti2O7. Frequency dependence of these ac ...
  • High-spin states of 204 At: isomeric states and shears band structure 
    Kanjilal D.; Dey S.K.; Bhattacharjee S.S.; Bisoi A.; Das M.; Dey C.C.; Nag S.; Palit R.; Ray S.; Saha S.; Sethi J.; Saha S. (Springer Science and Business Media Deutschland GmbH, 2022-08)
    High-spin states of neutron-deficient trans-lead nucleus 204At were populated up to ∼8MeV excitation through the 12C + 197Au fusion evaporation reaction. Decay of the associated levels through prompt and delayed γ-ray ...
  • Ho3+activated Ca0.5Y1.90-xO3 green-emitting nanophosphors for solid state lightening 
    Dwivedi, A; Srivastava, M; Srivastava, S K (Elsevier B.V., 2021-11-30)
    This paper presents a series of Ho3+activated Ca0.5Y1.90-xO3 green-emitting nanophosphors using the facile solution combustion method. X-ray diffraction (XRD) and Transmission electron microscope (TEM) confirm the phase ...
  • Holography with Incoherent Light 
    Gautam, Akanksha; T S, Athira; Naik, Dinesh N.; Narayanmurthy C.S.; Singh, Rajeev; Singh, Rakesh Kumar (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-04)
    Conventional digital holography uses the technique of combining two coherent light fields and the numerical reconstruction of the recorded hologram leads to the object amplitude and phase information. Despite significant ...
  • Hybrid quantum–classical chaotic NEMS 
    Singh A.K.; Chotorlishvili L.; Toklikishvili Z.; Tralle I.; Mishra S.K. (Elsevier B.V., 2022-11)
    We present an exactly solvable model of a hybrid quantum–classical system of a Nitrogen-Vacancy (NV) center spin (quantum spin) coupled to a nanocantilever (classical) and analyze the enforcement of the regular or chaotic ...
  • Identification of point defects on Co-Ni codoping in SnO2 nanocrystals and their effect on the structural and optical properties 
    Roy, S.; Prajapati, B.; Singh, A.; Joshi, A.G.; Chatterjee, S.; Ghosh, A.K. (American Institute of Physics Inc., 2019-10-21)
    Sn 0.97 - yCo 0.03Ni yO 2 (0 ≤ y ≤ 0.04) nanocrystals, with the average crystallite size in the range from 7.3 nm (for y = 0.00) to 5.6 nm (for y = 0.04), have been synthesized using a pH-controlled chemical coprecipitation ...
  • Imaging Incoherent Target Using Hadamard Basis Patterns † 
    Karmakar, Tanushree; Singh, Rajeev; Singh, Rakesh Kumar (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-31)
    In this paper, we present a correlation-based imaging technique in a single-pixel imaging scheme using Hadamard basis illumination. The Hadamard basis, which has the characteristics of a two-bit value {−1, 1} and sparsity ...
  • Impact of crystal structure on optical properties and temperature sensing behavior of NaYF4:Yb3+/Er3+ nanoparticles 
    Dubey, Charu; Yadav, Anjana; Baloni, Diksha; Kachhap, Santosh; Singh, Sunil Kumar; Singh, Akhilesh Kumar (Royal Society of Chemistry, 2023-07-11)
    We report a comprehensive study of the structural, morphological, and optical properties, and UC-based ratiometric temperature sensing behavior of (α) cubic and (β) hexagonal phases of NaYF4:Yb3+/Er3+ nanoparticles. The ...
  • Improvement of the “Triangle Method” for Soil Moisture Retrieval Using ECOSTRESS and Sentinel-2: Results over a Heterogeneous Agricultural Field in Northern India 
    Singh, Rishabh; Srivastava, Prashant K.; Petropoulos, George P.; Shukla, Sudhakar; Prasad, Rajendra (MDPI, 2022-10)
    For the purpose of deriving spatiotemporal estimates of soil moisture, the triangle method is one of the most widely used approaches today utilizing remote sensing data. Generally, those techniques are based on the physical ...
  • Impulsively Generated Linear and Non-Linear Alfvén Waves in the Coronal Funnels 
    Chmielewski, P.; Srivastava, A.K.; Murawski, K.; and et. al. (Polska Akademia Nauk, 2013-12-01)
    We present simulation results of the impulsively generated linear and non-linear Alfvén waves in the weakly curved coronal magnetic ffux-tubes (coronal funnels) and discuss their implications for the coronal heating and ...
  • Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona 
    A. K. Srivastava; D. Kuridze; T. V. Zaqarashvili; B. N. Dwivedi (2008-04)
    We study intensity oscillations in the solar chromosphere and corona, above a quiet-Sun magnetic network. Methods. We analyse the time series of He II 256.32 Å, Fe XI 188.23 Å and Fe XII 195.12 Å spectral lines, observed ...

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