Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abec2a
S. Joseph
Strain wave equation is a fourth order non-linear partial differential equation that arises in the study of non-dissipative strain wave propagation in micro structured solids. This equation also represents the dynamics of several physical phenomena. This equation can also be consider as a generalization of Boussinesq equation with dual dispersion. In this paper, a general strain wave equation is considered and obtained several new exact solutions. A variant of F-expansion method is applied to obtain the required solutions. The available traveling wave exact solutions are primarily obtained by integrating the resulting fourth order ordinary differential equation twice. But, in this paper, we show that there exist several traveling wave solutions to strain wave equation which cannot be derived using the existing methods. Several families of new exact solutions in rational function form are derived using this novel method, without performing the initial integration.
{"title":"New traveling wave rational form exact solutions for strain wave equation in micro structured solids","authors":"S. Joseph","doi":"10.1088/2633-1357/abec2a","DOIUrl":"https://doi.org/10.1088/2633-1357/abec2a","url":null,"abstract":"Strain wave equation is a fourth order non-linear partial differential equation that arises in the study of non-dissipative strain wave propagation in micro structured solids. This equation also represents the dynamics of several physical phenomena. This equation can also be consider as a generalization of Boussinesq equation with dual dispersion. In this paper, a general strain wave equation is considered and obtained several new exact solutions. A variant of F-expansion method is applied to obtain the required solutions. The available traveling wave exact solutions are primarily obtained by integrating the resulting fourth order ordinary differential equation twice. But, in this paper, we show that there exist several traveling wave solutions to strain wave equation which cannot be derived using the existing methods. Several families of new exact solutions in rational function form are derived using this novel method, without performing the initial integration.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48651823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abec2b
Arpan Dutta, V. Tiainen, J. Toppari
Fluorescence spectroscopy is commonly employed to study the excited-state photophysics of organic molecules. Planar Fabry-Pérot microcavities play an essential role in such studies and a strategic cavity design is necessary to attain an enhanced light-matter interaction. In this work, we computationally study different geometries for a planar metallic Fabry-Pérot microcavity tuned for the absorption of Sulforhodamine 101, a typical dye for fluorescence spectroscopy. The cavity consists of a polymer layer enclosed between two silver mirrors, where the thicknesses of all the three layers are varied to optimize the cavity. Our transfer-matrix and finite-difference time-domain simulations suggest that a cavity with 30 nm thin top mirror and 200 nm fully reflective thick bottom mirror, thus having only reflection and absorption and no transmission, is an optimal design for maximizing the Purcell factor and spectral overlap between the cavity and molecule, while still sustaining an efficient measurability of the fluorescence.
{"title":"Optimizing geometry of low-Q all-metal Fabry-Pérot microcavity for fluorescence spectroscopy","authors":"Arpan Dutta, V. Tiainen, J. Toppari","doi":"10.1088/2633-1357/abec2b","DOIUrl":"https://doi.org/10.1088/2633-1357/abec2b","url":null,"abstract":"Fluorescence spectroscopy is commonly employed to study the excited-state photophysics of organic molecules. Planar Fabry-Pérot microcavities play an essential role in such studies and a strategic cavity design is necessary to attain an enhanced light-matter interaction. In this work, we computationally study different geometries for a planar metallic Fabry-Pérot microcavity tuned for the absorption of Sulforhodamine 101, a typical dye for fluorescence spectroscopy. The cavity consists of a polymer layer enclosed between two silver mirrors, where the thicknesses of all the three layers are varied to optimize the cavity. Our transfer-matrix and finite-difference time-domain simulations suggest that a cavity with 30 nm thin top mirror and 200 nm fully reflective thick bottom mirror, thus having only reflection and absorption and no transmission, is an optimal design for maximizing the Purcell factor and spectral overlap between the cavity and molecule, while still sustaining an efficient measurability of the fluorescence.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41890137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abec9f
M. Hameeda, A. Plastino, Maria Cossu Rocca
In a cosmological context, observational best fits for galaxies’ distributions in the Universe have been tackled by recourse to different distribution functions. We provide here arguments favoring the formulation of a rather general distribution function (DF), of Poisson origin, describing galaxy clustering. The DF should be useful irrespective of distances or temperatures. We will be discussing distribution function for gravitational interactions.
{"title":"Generalized Poisson distributions for systems with two-particle interactions","authors":"M. Hameeda, A. Plastino, Maria Cossu Rocca","doi":"10.1088/2633-1357/abec9f","DOIUrl":"https://doi.org/10.1088/2633-1357/abec9f","url":null,"abstract":"In a cosmological context, observational best fits for galaxies’ distributions in the Universe have been tackled by recourse to different distribution functions. We provide here arguments favoring the formulation of a rather general distribution function (DF), of Poisson origin, describing galaxy clustering. The DF should be useful irrespective of distances or temperatures. We will be discussing distribution function for gravitational interactions.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49183569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abe99f
K. Tanabe
A direct, explicit derivation of the recently discovered time–information uncertainty relation in thermodynamics [S. B. Nicholson et al (2020), Nat. Phys. 16, 1211] is presented.
{"title":"An explicit derivation of the time–information uncertainty relation in thermodynamics","authors":"K. Tanabe","doi":"10.1088/2633-1357/abe99f","DOIUrl":"https://doi.org/10.1088/2633-1357/abe99f","url":null,"abstract":"A direct, explicit derivation of the recently discovered time–information uncertainty relation in thermodynamics [S. B. Nicholson et al (2020), Nat. Phys. 16, 1211] is presented.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42986475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abe364
G. Nagaraju, R. Sarathi
Epoxy nano composites were fabricated with the incorporation of nano AlN and MgO fillers to investigate their dielectric and space charge properties. Epoxy AlN nanocomposites with the addition of nano MgO have shown lower permittivity with reduced tanδ, good space charge behaviour, during poling period. Higher wt% of AlN in epoxy resin exhibited higher permittivity. The nanocomposites with AlN nanofiller have revealed higher space charge accumulation than on addition of MgO nano filler. Also, the addition of nanofillers to the base polymer has led to enhanced space charge decay performance compared to the base matrix.
{"title":"Investigation on the impact of nano MgO addition on dielectric properties and space charge behavior of epoxy resin AlN nanocomposites","authors":"G. Nagaraju, R. Sarathi","doi":"10.1088/2633-1357/abe364","DOIUrl":"https://doi.org/10.1088/2633-1357/abe364","url":null,"abstract":"Epoxy nano composites were fabricated with the incorporation of nano AlN and MgO fillers to investigate their dielectric and space charge properties. Epoxy AlN nanocomposites with the addition of nano MgO have shown lower permittivity with reduced tanδ, good space charge behaviour, during poling period. Higher wt% of AlN in epoxy resin exhibited higher permittivity. The nanocomposites with AlN nanofiller have revealed higher space charge accumulation than on addition of MgO nano filler. Also, the addition of nanofillers to the base polymer has led to enhanced space charge decay performance compared to the base matrix.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44374931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abdd96
J. Obiko
This article reports the effects of friction on the flow stress-strain curve obtained from uniaxial compression test. Uniaxial compression test was done at deformation temperature range of 575 °C–650 °C and strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1 and 0.5 s−1 to a strain of 0.6 using Gleeble® 3500 thermo-mechanical simulator. The friction parameter was calculated by using the analytical equation from the literature. The study reports the flow stress-strain curve results. The results showed a variation between the measured and the friction corrected flow stress-strain curves. The flow stress variation increased with an increase in strain. This result shows an increase in friction parameter resulting from contact between the die and the workpiece during deformation. The study has shown that the analytical equations used for hot deformation are applicable in analysing warm deformation flow stress-strain curves.
{"title":"Friction correction of flow stress-strain curve in the upsetting process","authors":"J. Obiko","doi":"10.1088/2633-1357/abdd96","DOIUrl":"https://doi.org/10.1088/2633-1357/abdd96","url":null,"abstract":"This article reports the effects of friction on the flow stress-strain curve obtained from uniaxial compression test. Uniaxial compression test was done at deformation temperature range of 575 °C–650 °C and strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1 and 0.5 s−1 to a strain of 0.6 using Gleeble® 3500 thermo-mechanical simulator. The friction parameter was calculated by using the analytical equation from the literature. The study reports the flow stress-strain curve results. The results showed a variation between the measured and the friction corrected flow stress-strain curves. The flow stress variation increased with an increase in strain. This result shows an increase in friction parameter resulting from contact between the die and the workpiece during deformation. The study has shown that the analytical equations used for hot deformation are applicable in analysing warm deformation flow stress-strain curves.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45528525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abddc9
E. Porcelli, V. S. Filho
We performed several measurements of angular velocities on a suspended monolayer capacitor subjected to high electric voltages. The experimental setup is similar to that reported by Trouton and Noble, but which presented negative results for the rotation of the device. The measurements were made without or with electromagnetic shielding in the capacitor. We measured a small torque on the device which caused its rotation in both configurations. The runs performed with and without electromagnetic shielding covering the capacitor, more or less insulation covering the elements of setup, several changes in the space separation between those elements and the small magnitude of the monitored current in the capacitor indicates that ion wind, electrostatic interaction and also the interaction with the Earth's magnetic field via leakage current cannot explain the magnitude of angular velocity or rotation effect. We hope that the data of our experiments can contribute for enhancement of understanding of the old puzzle.
{"title":"Trouton-Noble-like experiments on suspended capacitors","authors":"E. Porcelli, V. S. Filho","doi":"10.1088/2633-1357/abddc9","DOIUrl":"https://doi.org/10.1088/2633-1357/abddc9","url":null,"abstract":"We performed several measurements of angular velocities on a suspended monolayer capacitor subjected to high electric voltages. The experimental setup is similar to that reported by Trouton and Noble, but which presented negative results for the rotation of the device. The measurements were made without or with electromagnetic shielding in the capacitor. We measured a small torque on the device which caused its rotation in both configurations. The runs performed with and without electromagnetic shielding covering the capacitor, more or less insulation covering the elements of setup, several changes in the space separation between those elements and the small magnitude of the monitored current in the capacitor indicates that ion wind, electrostatic interaction and also the interaction with the Earth's magnetic field via leakage current cannot explain the magnitude of angular velocity or rotation effect. We hope that the data of our experiments can contribute for enhancement of understanding of the old puzzle.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43119603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abedca
E. M. Tari, A. Bahaoui, R. Lamsoudi, M. Khouilid, M. Ibnchaikh
In this research, we propose a simple approximation technique based on the decomposition of particles and on the Wentzel-Kramers-Brillouin approximation (WKB). The latter allows us to express analytically the expression of the form factor of a particle of a regular prismatic ice crystal shape. Our focus will be on studying the light scattering by horizontally oriented prismatic particles which rotate about their principal axes. To illustrate our formalism, a few numerical examples will be analyzed.
{"title":"The Wentzel-Kramers-Brillouin approximation for light scattering by horizontally oriented prismatic particles","authors":"E. M. Tari, A. Bahaoui, R. Lamsoudi, M. Khouilid, M. Ibnchaikh","doi":"10.1088/2633-1357/abedca","DOIUrl":"https://doi.org/10.1088/2633-1357/abedca","url":null,"abstract":"In this research, we propose a simple approximation technique based on the decomposition of particles and on the Wentzel-Kramers-Brillouin approximation (WKB). The latter allows us to express analytically the expression of the form factor of a particle of a regular prismatic ice crystal shape. Our focus will be on studying the light scattering by horizontally oriented prismatic particles which rotate about their principal axes. To illustrate our formalism, a few numerical examples will be analyzed.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44257092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.1088/2633-1357/abe99e
S. Pirandola
In this brief review, we start by clarifying the crucial differences between three different protocols of quantum channel discrimination. In some recent literature, there has been confusion between the protocols of quantum illumination [, ], quantum reading [], and a scheme of communication within a discrete-variable quantum computer []. While all these protocols are based on the model of quantum channel discrimination, they have completely different applications and features, which is the reason why they have different names and should not be naively confused. We also discuss the notion of quantum reading capacity [] of an ensemble of quantum channels, clarifying how this is easily extended to an adaptive formulation and discussing the mathematical conditions under which it can be connected to the different notion of dense coding capacity [] of a quantum channel.
{"title":"On quantum reading, quantum illumination, and other notions","authors":"S. Pirandola","doi":"10.1088/2633-1357/abe99e","DOIUrl":"https://doi.org/10.1088/2633-1357/abe99e","url":null,"abstract":"In this brief review, we start by clarifying the crucial differences between three different protocols of quantum channel discrimination. In some recent literature, there has been confusion between the protocols of quantum illumination [, ], quantum reading [], and a scheme of communication within a discrete-variable quantum computer []. While all these protocols are based on the model of quantum channel discrimination, they have completely different applications and features, which is the reason why they have different names and should not be naively confused. We also discuss the notion of quantum reading capacity [] of an ensemble of quantum channels, clarifying how this is easily extended to an adaptive formulation and discussing the mathematical conditions under which it can be connected to the different notion of dense coding capacity [] of a quantum channel.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41270988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-25DOI: 10.1088/2633-1357/abe9be
R. Kruse, Tharindu Lokukatagoda, Suboh Alkhushayni
We present an application of association rule learning to analyze Twitter account follow patterns. In doing so, we develop a basic framework and tutorial for future researchers to build on, which takes advantage of the Twitter API. To demonstrate the method, we take samples of Twitter accounts following Joe Biden and Donald Trump. For each account in our sample population, we pull the account’s 100 most recently followed accounts. This data is cleaned and formatted for use with Python’s apyori package, which uses the well-known apriori algorithm to learn association rules for a given dataset. This work has two objectives: (1) demonstrate the application association rule learning to social media networks and (2) perform exploratory analysis on the resulting association rules. We successfully demonstrate association rule learning in a Jupyter-notebook environment with Python. The resulting association rules indicate some interesting similarities and differences in the networks of Biden’s and Trump’s Twitter followers. The demonstrated method can be generalized to any non-private Twitter account(s). Extensions of our work can apply the method to larger datasets, with a focus on analyzing the learned association rules. Our study demonstrates an innovative application of association rule learning outside of the traditional use cases, which suggests similar opportunities in fields such as politics, education, public health, and more.
{"title":"A framework for association rule learning with social media networks","authors":"R. Kruse, Tharindu Lokukatagoda, Suboh Alkhushayni","doi":"10.1088/2633-1357/abe9be","DOIUrl":"https://doi.org/10.1088/2633-1357/abe9be","url":null,"abstract":"We present an application of association rule learning to analyze Twitter account follow patterns. In doing so, we develop a basic framework and tutorial for future researchers to build on, which takes advantage of the Twitter API. To demonstrate the method, we take samples of Twitter accounts following Joe Biden and Donald Trump. For each account in our sample population, we pull the account’s 100 most recently followed accounts. This data is cleaned and formatted for use with Python’s apyori package, which uses the well-known apriori algorithm to learn association rules for a given dataset. This work has two objectives: (1) demonstrate the application association rule learning to social media networks and (2) perform exploratory analysis on the resulting association rules. We successfully demonstrate association rule learning in a Jupyter-notebook environment with Python. The resulting association rules indicate some interesting similarities and differences in the networks of Biden’s and Trump’s Twitter followers. The demonstrated method can be generalized to any non-private Twitter account(s). Extensions of our work can apply the method to larger datasets, with a focus on analyzing the learned association rules. Our study demonstrates an innovative application of association rule learning outside of the traditional use cases, which suggests similar opportunities in fields such as politics, education, public health, and more.","PeriodicalId":93771,"journal":{"name":"IOP SciNotes","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47702771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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