Browsing by Author "Dheeraj Kumar"

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A study of anxiety and depression in benign breast disease
(Wolters Kluwer Medknow Publications, 2020) Vivek Srivastava; Rakesh Kumar Meena; Mumtaz A. Ansari; Dheeraj Kumar; Anand Kumar
Background: To compare the prevalence of anxiety and depression levels in patients with benign breast disease (BBD) and healthy individuals using Hospital Anxiety and Depression Scale (HADS) and Brief Patient Health Questionnaire (BPHQ). Methods: This study includes 100 patients who were clinically suspected of having BBDs and were matched against 100 healthy age-matched controls from June 2016 and July 2018. The diagnosis of BBD was established on the basis of ultrasonography, fine needle aspiration cytology, and/or histopathology. For the diagnosis of anxiety and depression, BPHQ was used and the level of anxiety and depression was measured using the HADS. The questionnaire at both prediagnosis and at follow-up assessment after 3 months was done. Results: On comparing anxiety and depression using BPHQ score among cases and controls, both were significantly associated with cases than controls (P < 0.001 and P = 0.0016, respectively). On comparing anxiety and depression using HADS score, there was a significant difference (median) in both anxiety and depression level between cases and controls (P < 0.001 and P < 0.001, respectively). After 3 months of follow-up, there was a significant improvement in anxiety and depression scores by both BPHQ (P = 0.007 and P = 0.0016) and HADS (P < 0.001 and P < 0.001). The 3-month follow-up data showed a significant improvement in BPHQ (depression) score in patients with breast lump and mastalgia (P = 0.001 and P = 0.008). The HADS (anxiety score) showed significant improvement in patients presenting with diseases/aberrations other than fibroadenoma while the HADS (depression) score showed a significant improvement in all except fibroadenosis present either alone or along with fibroadenoma. The HADS (depression) score showed a significant improvement in fibroadenoma, others group, breast lump, and mastalgia (P = 0.040, P = 0.005, P < 0.001, and P = 0.025, respectively). Conclusion: Indian female patients who present with BBDs are also affected by anxiety and depression. © 2020 Wolters Kluwer Medknow Publications. All rights reserved.
Effect of Chelated Minerals Supplement on Milk Yield and Composition of Sahiwal and Hariana Cows
(Agricultural Research Communication Centre, 2021) Tushar Rajendra Bhosale; Gorakshanath Raosaheb Antre; Dheeraj Kumar; Rajendra Kumar Pandey
Background: The study was carried out at the Dairy farm of Banaras Hindu University, Dist. Varanasi (Uttar Pradesh). Twelve (12) Sahiwal and Hariana cows ranging 4 - 6 years of age was randomly selected for present investigations. Animals were stratified for their initial body weight and age. The objective of the study was to compare the effect of feeding chelated mineral based formulation on dairy cow production performance, namely milk yield and milk composition. Methods: The trial was conducted with dairy cows 3 - 4 months of lactation. The experimental treatments included: Fedamin (Chelated minerals, given 50 gm. /day/ cow) and control. The study lasted from 0 to 30 days. Milk yield and milk composition of cows were measured individually on days 1, 8, 15, 22 and 30. Result: The Fedamin treated group (Chelated minerals) improved the milk yield and fat percentage in milk during this study as compared to control and specific gravity, solid-not fat, protein, lactose and total solids of milk differ non-significantly. © 2021 Agricultural Research Communication Centre. All Rights Reserved.
Electrical and magnetic properties of double perovskite Y2-xCaxCoMnO6 (x = 0.1, 0.2, 0.5)
(Springer, 2024) Dheeraj Kumar; Mohd Alam; Prajyoti Singh; Srishti Dixit; A.K. Ghosh; Sandip Chatterjee
The crystal structure, electronic, magnetic, and transport properties of the hole substituted (Ca2+) and partially B-site disordered double perovskite Y2-xCaxCoMnO6 system are studied. At room temperature, the samples demonstrated a monoclinic perovskite structure with a space group P21/n which was confirmed by Rietveld refinement of X-ray diffraction data. Ultra-violet visible analysis of these samples shows a direct band gap including gap energy near about 1.50 eV. X-ray photoemission spectroscopy measurement shows that component Co and Mn ions exist in a mixed state (Co3+, Co2+, Mn3+, and Mn4+). All samples exhibit semiconducting/insulating, and electrical conduction can be explained by Mott’s 3-D variable range hopping and small polaron hopping fitting. The magnetization numerical value decreases observed with increases in Ca concentration appears to be caused by increases in antiferromagnetic (AFM) phases. The double perovskite Y1.9Ca0.1CoMnO6 and Y1.8Ca0.2CoMnO6 show ferromagnetic transition at transition temperatures Tc~ 70 K and Tc~ 68 K, respectively. The analysis of the samples’ zero fields cooled DC magnetic susceptibility as a function of temperature reveals Griffiths-like singularity features that arise as the concentration of Ca increases in the parent system. The Griffith-like phase exists in the sample Y-site with Ca-substitution is independent of the structural disorder caused by the John–Teller active Mn3+ions in sample Y1.5Ca0.5CoMnO6. Field-dependent magnetization shows meta-magnetic behavior at low-temperature regions in Y1.9Ca0.1CoMnO6 and Y1.8Ca0.2CoMnO6. As the concentration of Ca increased from Y1.8Ca0.2CoMnO6 to Y1.5Ca0.5CoMnO6 meta-magnetic behavior disappeared. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.
Giant dielectric constant, magnetocaloric effect and spin-phonon coupling in EuTbCoMnO6 semiconductor
(Elsevier B.V., 2023) Mohd Alam; Labanya Ghosh; Srishti Dixit; Madhusmita Jena; Seema Kumari; Satya Vijay Kumar; Dheeraj Kumar; Abhineet Verma; A.K. Ghosh; Satyen Saha; R.J. Choudhary; Sandip Chatterjee
Transport, dielectric, magnetic and Raman studies of polycrystalline double perovskite EuTbCoMnO6 have been performed. Temperature-dependent resistivity follows the variable range and small polaron hopping mechanism. The temperature-dependent dielectric study shows the usual frequency-dependent step-like behavior. It also shows thermally activated relaxor peak in loss curves with giant dielectric constant near room temperature. The temperature-dependent magnetization demonstrates a second-order phase transition around 113 K. The critical behavior near the magnetic transition has been systematically investigated. The Widom scaling relation and magnetic entropy change calculation have verified the reliability of critical parameters. Maximum magnetic entropy change around the magnetic transition temperature shows the magnetocaloric effect. The estimated values of critical parameters are close to the value of the theoretical mean-field model. Temperature-dependent Raman study shows spin-phonon coupling in the system. The appearance of the magnetocaloric effect and colossal dielectric constant shows that these materials are interesting for real-life applications. © 2023 Elsevier B.V.
Impact of Trace Minerals Supplement on Reproductive Performance of Crossbred Cattle
(Agricultural Research Communication Centre, 2021) Dheeraj Kumar; Tushar Rajendra Bhosale; Mahendra Kumar; V.K. Paswan; Keshav Kumar; Anjali Nagori
Background: In lactating animals, the majority of factors like nutrient intake, physiological health, housing management and atmospheric conditions affect reproductive performance of the animal. In dairy animals the main factor affecting reproduction is nutrition status that too trace minerals. So to have a good return from the livestock trace minerals with balanced feeding of the animals must be done. Optimum feeding of minerals with respect to the various stages of reproductive life cycle must be done to increase the reproductive performance. Methods: Hence, present research trial was carried out at the Dairy farm of Banaras Hindu University, Dist. Varanasi (Uttar Pradesh). 24 Crossbred (Sahiwal × HF) non-cyclic, non-pregnant cattle, ranging 3-6 years of age were randomly selected to assess the role of trace minerals in fertility of infertile cows. Result: It is observed from the study, total 24 infertile crossbred cows were selected to induce oestrus taken for correction of anoestrosity with incorporated minerals. Total 8 out of 24 animals exhibited oestrus symptoms after the treatment. Among the animals received incorporated mineral (treatment group) 50% showed the oestrus symptoms. Among the animals under control 16.66% came into heat. © 2021 Agricultural Research Communication Centre. All right reserved.
Multifunctional behaviour in B-site disordered double perovskite EuPrCoMnO6
(IOP Publishing Ltd, 2022) Mohd Alam; Labanya Ghosh; Supriyo Majumder; Prajyoti Singh; Satya Vijay Kumar; Srishti Dixit; Dheeraj Kumar; Khyati Anand; Seema Kumari; A.K. Ghosh; R.J. Choudhary; Sandip Chatterjee
We report magnetic, transport, dielectric, and complex impedance of polycrystalline double perovskite EuPrCoMnO6 which crystallizes in disordered orthorhombic phase with space group Pnma. The DC magnetization shows two successive ferromagnetic transitions around 146 K and 138 K. The temperature and magnetic field variation of DC-susceptibility suggest the existence of Griffith phase and spontaneous exchange bias. AC susceptibility measurement shows a glassy dynamic behaviour near ferromagnetic transition. Further, a re-entrant glassy dynamic state is seen at a low temperature around 40 K. Temperature-dependent resistivity shows semiconducting/insulating nature, which gets increased under the application of magnetic field, showing positive magnetoresistance. The dielectric study shows usual frequency-dependent step-like behaviour with a colossal dielectric constant near room temperature. The complex impedance study shows both grain and grain boundary contribute to the electrical properties. The observed properties suggest the material can be used for spintronic devices and high dielectric applications. © 2022 IOP Publishing Ltd.
Observation of structural change-driven Griffiths to non-Griffiths-like phase transformation in Pr2-xSrxCoFeO6 (x = 0 to 1)
(Elsevier B.V., 2022) Arkadeb Pal; Khyati Anand; Dheeraj Kumar; Amish G. Joshi; Peter Tsung-Wen Yen; Shin-Ming Huang; H.D. Yang; A.K. Ghosh; Sandip Chatterjee
The study of crystal structure, electronic structure, transport, and magnetic properties of heterovalent Sr2+ doped Pr2-xSrxCoFeO6 (x = 0.0 to 1.0) system have been done. Crystal structure study reveals an occurrence of structural change from orthorhombic (Pnma) to tetragonal (I4/m) phase above x = 0.6. A sudden transformation of the Griffiths-like to non-Griffiths-like magnetic phase is observed as the system changes its crystal structure from Pnma to I4/m. The X-ray photoemission spectroscopy (XPS) study suggests for the existence of mixed oxidation states of the B-site ions viz., Co3+/Co4+ and Fe3+/Fe4+, and it also indicates an increase in the mean oxidation states owing to the hole substitution (Sr2+). The temperature variation of the electrical resistivity of the studied systems follows two different transport mechanisms, such as the variable range hopping (VRH) (in the lower temperature region) and small polaron hoping (SPH) (in the higher temperature region) models. Dc magnetization study shows that a local competing ferromagnetic (FM) exchange interaction increases with Sr doping. Finally, the ac susceptibility study reveals breaking of the long-range-ordering in the system x = 1.0, which appears to be related to the structural change and enhanced spin frustration due to increased competing local FM exchange interactions. In addition, electronic density of states (DOS) calculations of PrSrCoFeO6 (i.e. x = 1.0) using the density functional theory (DFT) have been performed for various Co/Fe atomic distributions. For most of the Co/Fe atomic distributions studied, the calculations show that the total energy of the system with FM coupling among spins has slightly lower energy than that for antiferromagnetic (AFM) coupling. © 2022
Observation of the multiple magnetic phases in double perovskite Pr1.8La0.2CoFeO6
(Elsevier B.V., 2024) Dheeraj Kumar; Prajyoti Singh; Mohd Alam; Satya Vijay Kumar; Srishti Dixit; Krishanu Bandyopadhyay; G.D. Dwivedi; Satyen Saha; A.K. Ghosh; Sandip Chatterjee
The structural and magnetic properties of the double perovskite Pr1.8La0.2CoFeO6 have been investigated. The X-ray diffraction study shows that the system acquires room-temperature orthorhombic phase with the Pnma space group. The X-ray photoemission spectroscopy (XPS) measurement confirmed that the B-site ions are present in mixed valence states i.e. Co has been found in Co2+ and Co3+ valance states whereas Fe has been found in Fe3+/Fe4+. Magnetic measurements of the system confirm the existence of several fascinating magnetic behaviors, such as long-range canted antiferromagnetism withTN ∼ 271 K, giant exchange bias, and re-entrant cluster glass phase (TG ∼ 33 K). Field-dependent magnetization shows a large spontaneous exchange bias; HSEB∼ 1.8 kOe and giant conventional exchange bias, HCEB∼ 2.4 kOe at 5 K. Antiferromagnetic materials with large exchange bias can be utilized in high-density spintronic devices. Temperature-dependent Raman study demonstrates that the observed phonon mode exhibits anomalous behavior close to the magnetic transition temperature. Analysis of anomalous softening of phonon mode below TN, clarifies the presence of significant spin-phonon coupling while the magnetostriction effect does not play any significant role in the observed phonon anomaly. © 2024