Pub Date : 2023-02-28DOI: 10.17265/2159-5348/2023.01.004
O. B. Ajiboye
: Geotechnical analyses were carried out to examine the contributions of engineering geological properties of subgrade soils to the failure of the Akure-Ikere Ekiti road, Southwestern Nigeria. Field observations revealed that the road is in a very poor state of serious deformation and disrepair as most parts of the road alignment have failed. The alignment of the studied road is predominantly underlain by Granite, Charnockites, and Migmatites. Laboratory tests results showed that the natural moisture content ranges from 10.98 to 21.4%, liquid limit from 22.8 to 47.7%, plastic limit from 19.2 to 24 .6, plasticity index 3.6 to 26.3%. The grain size analysis revealed that the amount of fines ranges from 15.9 to 49%. Others are linear shrinkage, between 1.4 and 10%, free swell between 25 and 46%, maximum dry density from 1593 to 2016 kg/m, and CBR between 5 and 48%. The specific gravity ranges from 2.64 to 2.74. With reference to AASHTO classification, 5% of the samples was classified as A-4, 15% classified as A-2-4, 40% classified as A-6, while 40% classified as A-7-6. The dominance of fair-to-good California bearing ratio, fair to good maximum dry density, high linear shrinkage and A-7-6, A-6, and A-2-4 soil groups have combined to give fair-to-good geotechnical properties to the studied soils. Generally, the fair to good geotechnical properties of soil of the road under study is an indication that the contribution of subgrade soil to the failure of the highway is negligible. The total breakdown of the road can be traced to substandard engineering specifications which are complemented by a poor drainage system.
{"title":"Contributions of Engineering Geological Properties of Subgrade Soils to Premature Failure of Major Highways in Southwestern Nigeria: A Case Study of Akure-Ikere Ekiti Highway","authors":"O. B. Ajiboye","doi":"10.17265/2159-5348/2023.01.004","DOIUrl":"https://doi.org/10.17265/2159-5348/2023.01.004","url":null,"abstract":": Geotechnical analyses were carried out to examine the contributions of engineering geological properties of subgrade soils to the failure of the Akure-Ikere Ekiti road, Southwestern Nigeria. Field observations revealed that the road is in a very poor state of serious deformation and disrepair as most parts of the road alignment have failed. The alignment of the studied road is predominantly underlain by Granite, Charnockites, and Migmatites. Laboratory tests results showed that the natural moisture content ranges from 10.98 to 21.4%, liquid limit from 22.8 to 47.7%, plastic limit from 19.2 to 24 .6, plasticity index 3.6 to 26.3%. The grain size analysis revealed that the amount of fines ranges from 15.9 to 49%. Others are linear shrinkage, between 1.4 and 10%, free swell between 25 and 46%, maximum dry density from 1593 to 2016 kg/m, and CBR between 5 and 48%. The specific gravity ranges from 2.64 to 2.74. With reference to AASHTO classification, 5% of the samples was classified as A-4, 15% classified as A-2-4, 40% classified as A-6, while 40% classified as A-7-6. The dominance of fair-to-good California bearing ratio, fair to good maximum dry density, high linear shrinkage and A-7-6, A-6, and A-2-4 soil groups have combined to give fair-to-good geotechnical properties to the studied soils. Generally, the fair to good geotechnical properties of soil of the road under study is an indication that the contribution of subgrade soil to the failure of the highway is negligible. The total breakdown of the road can be traced to substandard engineering specifications which are complemented by a poor drainage system.","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43824784","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 : 2023-02-28DOI: 10.17265/2159-5348/2023.01.002
T. Tsukutani, N. Yabuki
: This paper presents a current-mode universal biquad employing only positive type DVCCs (differential voltage current conveyors). The circuit enables LP (low-pass), BP (band-pass), HP (high-pass), BS (band-stop) and AP (all-pass) responses by the selection and addition of the input and output currents without any component matching constraints. Moreover the circuit parameters ω 0 and Q can be set orthogonally adjusting the circuit components. A design example is given together with simulation results by PSPICE.
{"title":"A Positive Type DVCC-Based Universal Biquad","authors":"T. Tsukutani, N. Yabuki","doi":"10.17265/2159-5348/2023.01.002","DOIUrl":"https://doi.org/10.17265/2159-5348/2023.01.002","url":null,"abstract":": This paper presents a current-mode universal biquad employing only positive type DVCCs (differential voltage current conveyors). The circuit enables LP (low-pass), BP (band-pass), HP (high-pass), BS (band-stop) and AP (all-pass) responses by the selection and addition of the input and output currents without any component matching constraints. Moreover the circuit parameters ω 0 and Q can be set orthogonally adjusting the circuit components. A design example is given together with simulation results by PSPICE.","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41786048","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 : 2023-02-28DOI: 10.17265/2159-5348/2023.01.001
Cuixiang Zhong
: Despite Pluto’s demotion to dwarf planet status, people are still attached to it. Scientists combined observations of Pluto from NASA’s New Horizons probe with observations of comet Churyumov-Gerasimenko from the European Space Agency’s Rosetta probe and found that Pluto’s nitrogen abundance matched the pattern of about a billion comets, which led to the theory that Pluto is made of about a billion comets. Yet they don’t know exactly when or where these comets originated. By studying the origin and orbit of comets, the author of this paper found that the material that condensed Pluto was mainly comets and dust ejected by Neptune, and the Kuiper Belt objects were condensed by material ejected by Neptune toward the outer side of its orbit.
{"title":"Formation and Evolution of Pluto and Kuiper Belt","authors":"Cuixiang Zhong","doi":"10.17265/2159-5348/2023.01.001","DOIUrl":"https://doi.org/10.17265/2159-5348/2023.01.001","url":null,"abstract":": Despite Pluto’s demotion to dwarf planet status, people are still attached to it. Scientists combined observations of Pluto from NASA’s New Horizons probe with observations of comet Churyumov-Gerasimenko from the European Space Agency’s Rosetta probe and found that Pluto’s nitrogen abundance matched the pattern of about a billion comets, which led to the theory that Pluto is made of about a billion comets. Yet they don’t know exactly when or where these comets originated. By studying the origin and orbit of comets, the author of this paper found that the material that condensed Pluto was mainly comets and dust ejected by Neptune, and the Kuiper Belt objects were condensed by material ejected by Neptune toward the outer side of its orbit.","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46703531","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 : 2023-02-28DOI: 10.17265/2159-5348/2023.01.003
K. Dobrovodský
: A system of mutually interacting point-mass objects is considered. All objects act on each other with mutual forces. A consistent relativity of motion based on the elimination of the observer is introduced. The center of inertia of the entire system is a common reference point. Central and mutual quantities are defined and the relationship between them is derived. A simple method of numerical approximation of the evolution of the central motion is presented. The scale invariance of the classical n-body problem is used to challenge the physical correctness of the problem formulation. Subsequently, a hypothesis is expressed about the extension of Coulomb’s law as well as Newton’s law of gravity. The consequences of the hypothesis are illustrated by the simulation of the helium-2 atom and the simulation of the motion of the stars S2, S4716 in the vicinity of the black hole in the core of our galaxy.
{"title":"N-Body Problem Extension Hypothesis","authors":"K. Dobrovodský","doi":"10.17265/2159-5348/2023.01.003","DOIUrl":"https://doi.org/10.17265/2159-5348/2023.01.003","url":null,"abstract":": A system of mutually interacting point-mass objects is considered. All objects act on each other with mutual forces. A consistent relativity of motion based on the elimination of the observer is introduced. The center of inertia of the entire system is a common reference point. Central and mutual quantities are defined and the relationship between them is derived. A simple method of numerical approximation of the evolution of the central motion is presented. The scale invariance of the classical n-body problem is used to challenge the physical correctness of the problem formulation. Subsequently, a hypothesis is expressed about the extension of Coulomb’s law as well as Newton’s law of gravity. The consequences of the hypothesis are illustrated by the simulation of the helium-2 atom and the simulation of the motion of the stars S2, S4716 in the vicinity of the black hole in the core of our galaxy.","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42243972","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 : 2022-02-28DOI: 10.17265/2159-5348/2022.01.002
R. Ahiska, Özge Bakar
: In this study, the soil-air generator of the thermoelectric safety system working with soil heat was investigated. For this, a special electronic safety device was made and the output parameters of the device were investigated. In order to investigate the operation of the thermoelectric “earth-air” generator safety system in real nature conditions, temperatures at the soil depth and soil surface equal to the length of the generator in four different regions of Ankara in four seasons were measured and modeled. Afterwards, physical parameters such as power P(W), voltage U(V) and current I(A) produced by the generator according to ΔT were examined by using all this scientific information with a special test setup. According to the results obtained, it has been determined that the Intelligent thermoelectric earth-air generator safety system (ATES) has the feature of notifying the security units in case of area violation by generating its own electricity with the help of the heat in the soil without the need for any electrical cable. In addition, the environmentally friendly ATES system is an innovative product and it has been seen that it will be used in various fields, especially in military applications.
{"title":"Smart Thermoelectric Earth-Air Generator Safety System","authors":"R. Ahiska, Özge Bakar","doi":"10.17265/2159-5348/2022.01.002","DOIUrl":"https://doi.org/10.17265/2159-5348/2022.01.002","url":null,"abstract":": In this study, the soil-air generator of the thermoelectric safety system working with soil heat was investigated. For this, a special electronic safety device was made and the output parameters of the device were investigated. In order to investigate the operation of the thermoelectric “earth-air” generator safety system in real nature conditions, temperatures at the soil depth and soil surface equal to the length of the generator in four different regions of Ankara in four seasons were measured and modeled. Afterwards, physical parameters such as power P(W), voltage U(V) and current I(A) produced by the generator according to ΔT were examined by using all this scientific information with a special test setup. According to the results obtained, it has been determined that the Intelligent thermoelectric earth-air generator safety system (ATES) has the feature of notifying the security units in case of area violation by generating its own electricity with the help of the heat in the soil without the need for any electrical cable. In addition, the environmentally friendly ATES system is an innovative product and it has been seen that it will be used in various fields, especially in military applications.","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43909895","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 : 2022-02-28DOI: 10.17265/2159-5348/2022.01.004
Quach Nguyen Bao Nguyen, Do Hung Dung
{"title":"Some Measures for Creating Creative Capacity for Students in Teaching Physics in High School","authors":"Quach Nguyen Bao Nguyen, Do Hung Dung","doi":"10.17265/2159-5348/2022.01.004","DOIUrl":"https://doi.org/10.17265/2159-5348/2022.01.004","url":null,"abstract":"","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47002158","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 : 2022-02-28DOI: 10.17265/2159-5348/2022.01.001
Cuixiang Zhong
{"title":"Formation and Evolution of Comets","authors":"Cuixiang Zhong","doi":"10.17265/2159-5348/2022.01.001","DOIUrl":"https://doi.org/10.17265/2159-5348/2022.01.001","url":null,"abstract":"","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48129425","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 : 2022-02-28DOI: 10.17265/2159-5348/2022.01.003
Huwaida K. Elgweri, Amal Hamed, Mohamed Mansor
{"title":"Numerical Solutions of Finite Well in Two Dimensions Using the Finite Difference Time Domain Method","authors":"Huwaida K. Elgweri, Amal Hamed, Mohamed Mansor","doi":"10.17265/2159-5348/2022.01.003","DOIUrl":"https://doi.org/10.17265/2159-5348/2022.01.003","url":null,"abstract":"","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48444113","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 : 2022-02-28DOI: 10.17265/2159-5348/2022.01.005
Laia Shirmohammadi
{"title":"Review the Behavior of Thorium Based Fuel (U,Th) and (Pu,Th)","authors":"Laia Shirmohammadi","doi":"10.17265/2159-5348/2022.01.005","DOIUrl":"https://doi.org/10.17265/2159-5348/2022.01.005","url":null,"abstract":"","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49462456","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 : 2021-02-28DOI: 10.17265/2159-5348/2021.02.002
Cuixiang Zhong
{"title":"Formation and Evolution of Galaxies and Its Black Holes and Quasars","authors":"Cuixiang Zhong","doi":"10.17265/2159-5348/2021.02.002","DOIUrl":"https://doi.org/10.17265/2159-5348/2021.02.002","url":null,"abstract":"","PeriodicalId":61481,"journal":{"name":"物理科学与应用:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47732887","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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