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Dry sliding tribological behavior of AZ31-WC nano-composites

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Journal of Magnesium and Alloys 2019年第2期7卷 315-327页

作者： sudip banerjee Suswagata Poria Goutam Sutradhar Prasanta Sahoo Department of Mechanical Engineering Jadavpur UniversityKolkata 700032India

The present study investigates the effect of WC nano-particles on tribological behavior of magnesium based nanocomposites for varying wt%of WC(0.5,1,1.5 and 2 wt%).Nanocomposites are fabricated using ultrasonic vibration assisted stir casting *** microscopy,scanning electron microscopy and energy dispersive x-ray patterns are used to characterize the base alloy and fabricated *** values of as-cast composites are obtained through Vicker’s micro-hardness *** and wear behavior of fabricated composites are studied using pin-on-disk type tribotester at room temperature under dry sliding *** load range is 10-40 N while sliding speed range is 0.1-0.4 m/*** of Mg-composites confirms particle inclusion as well as better microstructural integrity with increase in *** value of composites increases with increase in the amount of WC *** and friction behavior of base matrix are also enhanced due to incorporation of WC *** wear mechanisms occurring at the contact surfaces are ascertained through SEM images and EDAX *** in the tested surface is also identified through SEM and *** yields better tribological behavior in composites.

关键词： Mg-WC nanocomposites Ultrasonic vibration Stir-casting Wear Friction

Characterization and Propagation of Historical and Projected Droughts in the Umatilla River Basin, Oregon, USA

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Advances in Atmospheric Sciences 2024年第2期41卷 247-262,I0020-I0028页

作者： sudip GAUTAM Alok SAMANTARAY Meghna BABBAR-SEBENS Meenu RAMADAS School of Civil and Construction Engineering Oregon State UniversityCorvallisOR 97331USA School of Infrastructure Indian Institute of TechnologyBhubaneswarOdisha 752050India

Climate change is expected to have long-term impacts on drought and wildfire risks in Oregon as summers continue to become warmer and drier. This paper investigates the projected changes in drought characteristics and drought propagation in the Umatilla River Basin in northeastern Oregon for mid-century(2030–2059) and late-century(2070–2099) climate scenarios. Drought characteristics for projected climates were determined using downscaled CMIP5 climate datasets from ten climate models and Soil and Water Assessment Tool to simulate effects on hydrologic processes. Short-term(three months) drought characteristics(frequency, duration, and severity) were analyzed using four drought indices, including the Standardized Precipitation Index(SPI-3), Standardized Precipitation-Evapotranspiration Index(SPEI-3), Standardized Streamflow Index(SSI-3), and the Standardized Soil Moisture Index(SSMI-3). Results indicate that short-term meteorological droughts are projected to become more prevalent, with up to a 20% increase in the frequency of SPI-3drought events. Short-term hydrological droughts are projected to become more frequent(average increase of 11% in frequency of SSI-3 drought events), more severe, and longer in duration(average increase of 8% for short-term droughts).Similarly, short-term agricultural droughts are projected to become more frequent(average increase of 28% in frequency of SSMI-3 drought events) but slightly shorter in duration(average decrease of 4%) in the future. Historically, drought propagation time from meteorological to hydrological drought is shorter than from meteorological to agricultural drought in most sub-basins. For the projected climate scenarios, the decrease in drought propagation time will likely stress the timing and capacity of water supply in the basin for irrigation and other uses.

关键词： Umatilla drought SPI SPEI SSI SSMI

Propagating disturbances along fan-like coronal loops in an active region

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Research in Astronomy and Astrophysics 2015年第11期15卷 1832-1842页

作者： sudip Mandal Tanmoy Samanta Dipankar banerjee S.Krishna Prasad Luca Teriaca Indian Institute of Astrophysics Astrophysics Research Centre School of Mathematics and Physics Queen’s University Belfast Max-Planck-Institut fuer Sonnensystemforschung (MPS)

Propagating disturbances are often observed in active region fan-like coronal loops. They were thought to be due to slow mode magnetohydrodynamic waves based on some of the observed properties. However, recent studies involving spectroscopy indicate that they could be due to high speed quasi-periodic upflows which are difficult to distinguish from upward propagating slow waves. In this context, we have studied a fan loop structure in the active region AR 11465 using simultaneous spectroscopic and imaging observations from the Extreme Ultraviolet Imaging Spectrometer onboard Hinode and Atmospheric Imaging Assembly onboard Solar Dynamics Observatory. Analysis of the data shows significant oscillations at different locations. We explore the variations in different line parameters to determine whether the waves or flows could cause these oscillations to improve the current understanding of the nature of these disturbances.

关键词： wavelet simultaneous distinguish Extreme propagating Solar fitting pixel spectroscopic Roberts

Simultaneous observations of a pair of kilohertz QPOs and a plausible 1860Hz QPO from an accreting neutron star system

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Research in Astronomy and Astrophysics 2010年第3期10卷 227-234页

作者： sudip Bhattacharyya Department of Astronomy and Astrophysics Tata Institute of Fundamental Research

We report an indication （3.22 or） of ≈ 1860 Hz quasi-periodic oscillations from a neutron star low-mass X-ray binary 4U 1636-536. If confirmed, this will be by far the highest frequency feature observed from an accreting neutron star system, and hence could be very useful in understanding such systems. This plausible timing feature was observed simultaneously with lower （≈ 585 Hz） and upper （≈ 904 Hz） kilohertz quasi-periodic oscillations. The two kilohertz quasi-periodic oscillation frequencies had a ratio of ≈ 1.5, and the frequency of the alleged ≈ 1860 Hz feature was close to the triple and the double values of these frequencies. This can be useful for constraining the models of all the three features. In particular, the ≈ 1860Hz feature could be （1） from a new and heretofore unknown class of quasi-periodic oscillations, or （2） the first observed overtone of lower or upper kilohertz quasi-periodic oscillations. Finally, we note that, although the relatively low significance of the ≈ 1860 Hz feature argues for caution, even a 3.22 σ feature at such a uniquely high frequency should be interesting enough to spur a systematic search in the archival data, as well as to scientifically motivate sufficiently large timing instruments for the next generation X-ray missions.

关键词： accretion accretion disks -- methods: data analysis -- relativity -- stars: neutron -- X-rays: binaries -- X-rays: individual (4U 1636-536)

Study of an epidemic model with Z-type control

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International Journal of Biomathematics 2018年第7期11卷 37-57页

作者： sudip Samanta Department of Mathematics Faculty of Science and Arts --Rabigh King Abdulaziz University Rabigh 25732Saudi Arabia

In the present paper,an epidemic model with Z-type control mechanism has been pro- posed and analyzed to explore the disease control strategy on an infectious disease *** uncontrolled model can have a disease-free equilibrium and an endemic *** expression of the basic reproduction number and the conditions for the stability of the equilibria are *** is also observed that the disease-free equilibrium is globally asymptotically stable if R0*** model is further improved by considering Z-control mechanism and *** can be controlled by using Z-control while the basic reproduction of the uncontrolled system is greater than *** positivity conditions of the solutions are derived and the basin of attraction for successful implementation of Z-control mechanism is also *** verify the analytical findings,extensive numerical simulations on the model are carried out.

关键词： SI model basic reproduction number global stability Z-type control basin of attraction disease control

Finding effective combinations of compounds to prevent Alzheimer's disease

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Neural Regeneration Research 2022年第11期17卷 2450-2451页

作者： sudip Dhakal Ian Macreadie School of Science Bundoora CampusRMIT University

Alzheimer's disease AD remains one of the significant causes of death and morbidity in the older population (2021).The cause of AD remains unclear despite there being numerous *** the most widely accepted hypothesis is the amyloid cascade hypothesis which is based on the accumulation of amyloid beta (Aβ) in neurons (Dhakal et al., 2019).

关键词： Alzheimer Aβ death

Fabrication of Biomimetic Transparent and Flexible Pectin/PEG Composite Film for Temperature Sensing Applications

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Journal of Bionic Engineering 2023年第1期20卷 47-56页

作者： M.E.Harikumar sudip K.Batabyal Department of Electronics and Communication Engineering Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatore641112India Department of Science Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatore641112India Amrita Center for Industrial Research&Innovation(ACIRI) Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatore641112India

In the field of robotics to enhance the interaction with humans in real-time and in the bioengineering field to develop prosthetic devices, the need for artificial skin is in high demand. In this work, the hydrogen-bonded complex network structure of the Pectin/PEG composite has been designed, resulting in the free-standing film functioning as a temperature-sensing device. With the gelation technique and the addition of PEG, the film’s flexibility and conductivity were enhanced. The fabricated device worked at a low voltage of 1 V supply with high throughput. With different dimensions, three devices were fabricated, and the maximum-induced ionic current was 34 µA ± 5%. The device has an average sensitivity of 1.3–2.7 µA/°C over the range of 30 °C to 42 °C. The device's fastest response time to sense the temperature change was 2 s ± 5%. The present device exhibits good stability for a long duration of time. These pectin/PEG films can be used as biomimetic skin to improve the efficiency in sensing the temperature.

关键词： Pectin film Temperature sensor Ionic current.Thermo-reversible Thin-film NTC

Potential contributions of trace amines in Alzheimer's disease and therapeutic prospects

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Neural Regeneration Research 2021年第7期16卷 1394-1396页

作者： sudip Dhakal Ian Macreadie School of Science Bundoora CampusRMIT UniversityVictoriaAustralia

Trace amines and their biochemistry: Trace amines represent endogenous monoamines present in very low concentration(usually nM) in the brain in comparison to classical monoamine *** trace amines can regulate the amoun... 详细信息

关键词： amines Trace usual

Polymer Modified Banana Pseudo Stem-based Interfacial Solar-driven Evaporation System

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Journal of Bionic Engineering 2022年第3期19卷 752-760页

作者： Vivek Chandran Sujith Lal sudip K.Batabyal Department of Sciences Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatoreTamil Nadu641112India Amrita Centre for Industrial Research and Innovation(ACIRI) Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatoreTamil Nadu641112India

Interfacial solar-driven evaporation technique is an environmental friendly and cost-effective advanced approach for water purification using solar *** energy sources are effectively utilized using the structural design of evaporators and functional *** this work,we have fabricated a solar-driven interfacial evaporation device with Banana Pseudo Stem(BPS)and a photothermal layer made up of PVA PDMS Carbon(PPC)is attached to *** evaporation rate of 2.03 kg m^(−2) h^(−1) is achieved by the system under 1 sun *** localization on interfacial surface,reflectance of photothermal layer,presence of micro-fluidic channels in BPS were studied using IR imaging,UV-DRS and SEM characterization techniques,*** localization of interfacial temperature around 53℃ and very low reflectance of photothermal layer substantiates high photothermal conversion efficiency of the *** complete purification of water containing high concentration of Rhodamine-B dye using BPS is a novel and simple approach for water *** is an eco-friendly,cost-efficient novel approach in fabrication of interfacial solar-driven evaporation system with high evaporation rate for purification of water containing high concentration of organic dye.

关键词： Banana pseudo stem Polymers Interfacial evaporator Biomaterial Water purification High efficiency