检索结果-南通市图书馆

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

Morphological and Microstructural Evidences of Paleo-Seisminc Occurrences in an Earthquake Prone Zone of Tripura, India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2014年第2期25卷 289-298页

作者： sudip Dey Sushmita Paul Prasamita Sarkar Department of Geography and Disaster Management Tripura University

Morphology and structure of a faulted zone not only express the present status but also preserve the evidences of early seismo-tectonic occurrences. The present paper aims to assess the morphological as well as subsurface evidences of early seismo-tectonic occurrences in an earth- quake prone zone of Baromura Hill, Tripura. Tectonically this is a part of Tripura-Mizoram fold belt and fall within Zone V of BIS seismic map. In the present research the tectonic lineaments of Baromura Hill was identified by using satellite data. For that purpose, Landsat TM shortwave in- frared, midwave infrared and near infrared was selected for preparing suitable band combination. A classified thermal infrared was used for final operation. From the remote sensing operation five clear tectonic lineaments were found. During the field work rock samples were collected for labora- tory testing. Thin sections of the rocks show that complex stress pattern was developed during the geological past which caused strong seismo-tectonic occurrences. From the study it can be assessed that though the nature of the paleo-seismic occurrences were almost same but the level of impact varied through spatial and temporal scales due different physical properties and arrangements. It is also clear from the study that the geological evolution of this place is more complex as it seems to be. Tectonic and geomorphic processes worked together through the Tertiary and Quaternary periods and played equally important role for landform evolution.

关键词： morphology tectonic lineament microstructure grain scale deformation Baromura Hill geomorphic process.

Probing the compound effect of spatially varying intrinsic defects and doping on mechanical properties of hybrid graphene monolayers

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第15期47卷 44-58页

作者： Kritesh Kumar Gupta Tanmoy Mukhopadhyay Aditya Roy sudip Dey Department of Mechanical Engineering National Institute of Technology SilcharSilcharIndia Department of Aerospace Engineering Indian Institute of Technology KanpurKanpurIndia

Doping in pristine 2 D materials brings about the advantage of modulating wide range of mechanical properties ***,intrinsic defects(such as Stone-Wales and nanopore) in such hybrid materials are inevitable due to complex manu facturing and synthesis *** that,de fects and irregularities can be intentionally induced in a pristine nanostructure for multi-synchronous modulation of various multi-functional *** the case may be,in order to realistically analyse a doped graphene sheet,it is of utmost importance to investigate the compound effect of doping and defects in such 2 D *** we present a molecular dynamics based investigation for probing mechanical properties(such as Young’s modulus,post-elastic behaviour,failure strength and strain)of doped graphene(C14 and Si) coupling the effect of inevitable *** sensitivity of defect and doping are systematically analyzed considering different rational *** study reveals the effects of individual defects and doping along with their possible compounded influences on the failure stress,failure strain,Young’s modulus and constitutive relations beyond the elastic *** detailed mechanical characterization under the practically relevant compound effects would allow us to access the viability of adopting doped graphene in various multifunctional nanoelectromechanical devices and systems in a realistic situation.

关键词： Defect in graphene Doped graphene Defected 2D material Temperature-dependent mechanical properties Spatial sensitivity of defect and doping

Illumination-Free Clustering Using Improved Slime Mould Algorithm for Acute Lymphoblastic Leukemia Image Segmentation

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2023年第6期20卷 2916-2934页

作者： Krishna Gopal Dhal Swarnajit Ray sudip Barik Arunita Das Department of Computer Science and Application Midnapore College(Autonomous)Paschim MedinipurMidnaporeWest BengalIndia Department of Computer Science and Engineering Maulana Abul Kalam Azad University of TechnologyKolkataWest BengalIndia Department of Computer Science and Engineering Kalyani Government Engineering CollegeKalyaniWest BengalIndia

Partitional clustering techniques such as K-Means(KM),Fuzzy C-Means(FCM),and Rough K-Means(RKM)are very simple and effective techniques for image ***,because their initial cluster centers are randomly determined,it is often seen that certain clusters converge to local *** addition to that,pathology image segmentation is also problematic due to uneven lighting,stain,and camera settings during the microscopic image capturing ***,this study proposes an Improved Slime Mould Algorithm(ISMA)based on opposition based learning and differential evolution’s mutation strategy to perform illumination-free White Blood Cell(WBC)*** ISMA helps to overcome the local optima trapping problem of the partitional clustering techniques to some *** paper also performs a depth analysis by considering only color components of many well-known color spaces for clustering to find the effect of illumination over color pathology image *** and visual results encourage the utilization of illumination-free or color component-based clustering approaches for image ***-KM and“ab”color channels of CIELab color space provide best results with above-99%accuracy for only nucleus ***,for entire WBC segmentation,ISMA-KM and the“CbCr”color component of YCbCr color space provide the best results with an accuracy of above 99%.Furthermore,ISMA-KM and ISMA-RKM have the lowest and highest execution times,*** the other hand,ISMA provides competitive outcomes over CEC2019 benchmark test functions compared to recent well-established and efficient Nature-Inspired Optimization Algorithms(NIOAs).

关键词： Pathology image Image segmentation Clustering Color space White blood cell Optimization Swarm intelligence Fuzzy clustering Rough clustering