365 research outputs found
The characteristics of aluminum–scandium alloys processed by ECAP
No full textAluminum–scandium alloys were prepared having different scandium additions of 0.2, 1.0 and 2.0 wt.% and these alloys were processed by equal-channel angular pressing (ECAP) at 473 K. The results show the grain refinement of the aluminum matrix and the morphology of the Al3Sc precipitates depends strongly on the scandium concentration. The tensile properties were evaluated after ECAP by pulling to failure at initial strain rates from 1.0 × 10?3 to 1.0 × 10?1 s?1. The Al–1% Sc alloy exhibited the highest tensile strength of 250 MPa at a strain rate of 1.0 × 10?1 s?1. This alloy also exhibited a superior grain refinement of 0.4 ?m after ECAP where this is attributed to a smaller initial grain size and an optimum volume fraction of dispersed Al3Sc precipitates having both micrometer and nanometer sizes.<br/
Covid-19 Diagnosis from X-Ray Images using Support Vector Machine
No full textAbstract: Coronavirus disease strike the world in 2019 and commonly called COVID-19 with its update given by the World Health Organization (WHO) on December 31, 2019. It infected more than 100 countries, an infectious disease strike the whole world and people of all age groups became a global health emergency. This disease can transmit from person to person through respiratory droplets and thus is highly contagious. The second wave almost killed billions of persons and lead to several liver problems, pneumonia, respiratory failure, cardiovascular diseases, etc. This can be symptomatic as well as asymptomatic in some patients and thus lead to increased communicability. Machine Learning is a latest trend currently useful in almost all research areas. Using these techniques to diagnose corona makes it highly feasible to cope up with this emergency. Different methods for testing corona virus are present but they require huge delay, are expensive, highly dependent test kits, higher negative false rate and prone to human errors. In this article we provide the state of the art of the covid diagnosis using Chest X ray images and this can guide both clinicians and technologists. A support vector machine is used to train the model and classify images into normal, pneumonia, and covid images. An overall accuracy of 95% is achieved using this method.
Keywords: COVID-19, Corona Virus, Machine Learning, Convolutional Neural Network, Support Vector Machine, X-ray images, Pneumonia.
Title: Covid-19 Diagnosis from X-Ray Images using Support Vector Machine
Author: Satyendra Kumar Sagar
International Journal of Recent Research in Mathematics Computer Science and Information Technology
ISSN 2350-1022
Vol. 9, Issue 2, October 2022 - March 2023
Page No: 24-32
Paper Publications
Website: www.paperpublications.org
Published Date: 16-December-2022
DOI: https://doi.org/10.5281/zenodo.7446436
Paper Download Link (Source)
https://www.paperpublications.org/upload/book/Covid-19%20Diagnosis%20from%20X-Ray-16122022-2.pdfInternational Journal of Recent Research in Mathematics Computer Science and Information Technology, ISSN 2350-1022, Paper Publications, Website: www.paperpublications.or
Scientometric Portrait of Homi Jehangir Bhabha: The Father of Indian Nuclear Research Programme
No full textQuantitative and qualitative analysis with graphic representation of the publication productivity of a scientist facilitates easy and clear perception about the work of a scientist. Bhabha’s scientific work spanned over more than three decades (1933-1967) during which he published 104 publications, which could be classified into nine fields: Interaction of Radiation with Matter (4), Quantum Electrodynamics (5), Mathematical Physics (2), Cosmic Ray Physics (18), Elementary Particle Physics (14), Field Theory (15), General Physics (2), Nuclear Physics (4) and General (40). The highest number of publications (6) were published in 1941, 1945 and 1964 respectively. The average number of publications published per year was 3.05. His productivity coefficient was 0.05 which is a clear indicates that his publication productivity was quite consistent throughout his scientific career. He was single author in 79 of his publications and the main author in 24 publications indicates that he always preferred to work himself and lead the team as ‘mentor’. Bhabha had 22 collaborators during the period. Team of research collaborators working with a successful scientist documents the sociological aspect of history of science while generating knowledge by a leader in a domain.
Bhabha became a citable author in 1937. Bhabha received 1211 citations to his 30 publications out of 104 publications. Out of 104, 74 publications did not receive any citations. Out of 74 publications, 40 publications dealt subjects mainly of general interest. Bhabha’s 86.66 percent of cited publications received their first citations within four years of their publication indicates that his publications were noticed immediately and had direct impact among the fellow researchers working all over the world. His overall citation rate was 11.64 per cited publication. The highest citations 389 were received to the domain ‘Cosmic ray physics’. The highest number of citations received were 45 in 1938. His self-citations were only 24 (1.98%) and citations by others were 1187 (98.02%). The highest self citations were six in 1946. Bhabha’s mean diachronous self-citation rate was 1.98. The highest citation rate 28.4 was to the domain ‘Quantum electrodynamics. His single authored publications have received the highest number 863 (71.26%) of citations. Bhabha’s five publications have been cited more than 100 times each. His publications have been cited by the authors working in various diverse fields like nuclear physics, mathematical physics, instrumentation, optics, geophysics and geochemistry, condensed matter physics, applied physics, electrical and electronic engineering, mechanical engineering etc., indicating a very diverse influence and impact of Bhabha’s publications. Bhabha’s publications have also been cited by the Nobel laureates like V. L. Ginzberg, Wolfgang Pauli, H. A. Bethe, M. Born, W. Bothe, E. P. Wigner, H. Yukawa, P. M. S. Blackett and C. N. Yang which is an indication of his originality of ideas and high quality of publications
Slow Dynamics In Complex Fluids : Confined Polymers And Soft Colloids
No full textThe thesis describes the study of slow dynamics of confined polymers and
soft colloids. We study the finite size effect on the dynamics of glassy polymers
using newly developed interfacial microrheology technique. Systematic
measurement have been performed to address the issue of reduction of glass
transition under confinements. Slow and heterogeneous dynamics are the underlined observed behavior for dynamics in confined glassy polymers. The slow relaxation dynamics and dynamical heterogeneity in polymer grafted nanoparticles (PGNPs) systems were studied using advanced X - ray photon correlation spectroscopy (XPCS) techniques. Our studies presented in this thesis on dynamics of polymer grafted nanoparticle systems in melts and solution are the first attempt to study them experimentally. Thus our work shed the light about new technique to study confined system more accurately and explore new soft colloidal system to study fascinating dynamics and interesting phase behavior.
In Chapter 1, we provide the theoretical background along with brief review of the literature for understanding the results presented in this thesis. The details of the experimental set up and their operating principle along with the details of the experimental conditions are provided in Chapter 2. In Chapter 3 we present our newly developed technique (interfacial microrhelogy) and its consequences to study the complex fluids at interface. Chapter 4 discusses the concentration and temperature dependent glassy dynamics in confined glassy
polymers. In Chapter 5 we provide the structural and dynamical study of polymer
grafted nanoparticles in melts and solutions. We provide the summary of
our result and the future prospective of the work in Chapter 6.
Chapter-1 provides the ground work and theoretical aspects for understanding
the results presented in this thesis. It starts with the discussion about
the slow dynamics of complex fluids and transit to dynamic behavior of polymer
in confinement, glassy dynamics in confinements . This also discusses
the basic aspects of studying viscoelastic properties using rheology, interface
rheology, microrheology, interface microrheology techinques. In continuation it
discusses structure and dynamics of different soft colloids investigated for last decade and then theoretical aspects of XPCS is discussed. Towards the end
of this Chapter, we discuss the procedure to explain and understand systems
dynamical heterogeneity near glass like phase transition.
Chapter-2 contains the details of the experimental techniques which has been used for the study of confined polymers and soft colloids. Brief introduction to basic principles of the measurements followed by details of the material and
methods have been provided.
Chapter-3 we discuss the interafacial microrheology of different complex fluids and advantages of the techniques is discussed in Chapter 3. This includes
discussion about the technique sensitivity at the surface using quantum dots
(QDs) as a probe and about the configuration of the QDs at/on monolayer. Later
on establishment of the technique has been demonstrated through easurements on arachidic acid, poly(methylmethacrylate) (PMMA), poly(vinylacetate) (PVAc), poly(methylacrylate) (PMA) monolayers. The extracted subdiffusive nature of QDs in on monolayers through mean square displacement has been explained using fractional Brownian motion model. Towards the end of the chapter we discuss about the extraction of real and imaginary elastic modulus from mean square displacement data using generalized Stokes-Einstein relation for the quasi two dimensional systems and explains about the possible viscoelastic transition in the different monolayers.
The concentration and temperature dependent glassy dynamics of confined polymers (PMMA) are discussed in Chapter-4. We demonstrate the microscopic nature of spatio-temporal variation of dynamics of glassy polymers confined to a monolayer of 2 3 nm thickness as a function of surface density and temperature. It illustrates the systems dynamical heterogeneity and explain the observed large reduction of glass transition temperature in confined system through finite size effect.
In Chapter 5 we discuss the result based on systematic studies of dynamics of PGNPs in melts and solutions. In addition it also illustrates the structural anisotropy and anomalous dynamical transitions in binary mixture of PGNPs and homopolymers in good solvent condition. It provides temperature
and wave vector dependent XPCS measurements on polymer grafted nanoparticles with the variation of functionality. The functionality ( f ) dependent nonmonotonic relaxation in melts of PGNPs and solvent quality dependent non monotonic relaxation of PGNPs system have been elaborated in the continuation.
We present possible phase behavior of PGNPs system in good solvent with addition of homopolymer of two different molecular weight.
Chapter 6 contains the summary and the future perspective of the work presented
Ceramic-Metal Joining Using Active Filler Alloy-An In-Depth Electron Microscopic Study
No full textNon
Dansyl cadaverine regulates ligand induced endocytosis of interleukin-8 receptor in human polymorphonuclear neutrophils
No full textAbstractInterleukin-8 (IL-8), a neutrophil chemotactic agent, acts as a key mediator in a large number of acute and chronic inflammatory diseases. At 37°C, the receptor for IL-8 is rapidly internalized with its ligand. But no specific inhibitor of this ligand induced internalization of the receptor has been reported so far. We have found that monodansyl cadaverine (MDC) inhibited about 70% of IL-8 induced endocytosis and caused 70% and 66% inhibition of IL-8 mediated chemotaxis and respiratory burst response, respectively, in neutrophils. The uninternalized receptor was detected by anti IL-8R antibody in MDC treated cells. The endocytosis of IL-8R was strongly inhibited under Ca2+ depleted conditions which was restored on addition of 1 mM CaCl2 indicating the critical involvement of a Ca2+ ion in the process. Absence of receptor internalisation makes the MDC treated neutrophils suitable for studying the interaction of IL-8R with potential therapeutic agents e.g. for in vitro screening of anti-inflammatory agents
Chiral tricyclic triazolooxazine derived mesoionic carbene (MIC)-Pd(II) complexes of cyclohexene oxide scaffold: Synthesis, structure, and characterizations
No full textWe herein report the well-defined two novel chiral palladium(II) complexes 1(b−c), of the chiral N-fused tricyclic triazolooxazine derived mesoionic carbene (tz-MIC) ligand 1a. The chiral tricyclic PEPPSI type complex (pyridine enhanced pre-catalyst preparation stabilization and initiation) namely, trans-[tz-MIC)-PdI2(pyridine)] (1b), and the chiral tricyclic bis(tz-MIC)-palladium complex namely, cis-[tz-MIC)2-PdCl2] (1c). The chiral tricyclic trans-[tz-MIC)-PdI2(pyridine)] PEPPSI type complex (pyridine enhanced pre-catalyst preparation stabilization and initiation) (1b) was directly obtained from their respective chiral tricyclic triazolooxazinium iodide salt (1a), by treatment with PdCl2 and K2CO3 in pyridine in 77% yield. The chiral tricyclic triazolooxazinium iodide salt (1a), was first converted to its in-situ silver analogue by reaction with Ag2O and then subsequently upon treatment with (COD)PdCl2 to produce the chiral tricyclic (tz-MIC)2PdCl2 type palladium complex (1c) in 84% yield. All these palladium complexes were isolated for the first time and structurally characterized by 1H NMR and 13C{1H}-NMR spectroscopy, FT-IR spectroscopy, mass spectrometry, elemental analysis and single crystal X-ray crystallography.MKG thanks to the Council of Scientific and Industrial Research (CSIR File No: 09/087(0663)/2010-EMR-I), New Delhi, for financial support of this research. The author gratefully acknowledge to the Single Crystal X-ray Diffraction Facility, Department of Chemistry IIT Bombay, India. The author also thanks to Professor P. Ghosh from Department of Chemistry, IIT Bombay, for his technical support. The author thanks to Professor Raymond John Butcher for solving the Single Crystal X-ray structures. The author gratefully acknowledge to CSIR, New Delhi for research fellowship
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