Pub Date : 2014-12-26DOI: 10.3968/J.ANS.1715787020120504.688
Z. Jian, Tan Wen-xian, Su Shi-jie, G. Chao
In order to investigate effects of different foundation models on jack-up site assessment, numerical simulation of a jack-up is presented based on fix joint, pin joint, linear springs and elastic-plastic model. The hull, leg, hull-leg connection is modelled using equivalent beam, beam element, spring element, respectively. Environmental loads, such as steady current, wind, wave, inertial load and buoyancy, are also included in the numerical model. Static and natural frequency extraction analysis of the jack-up is then performed in elevated condition. Finally, static and natural response rules are proposed for the four foundation models. The results show that, the horizontal hull displacement, maximum leg stress, loads on spudcan B and horizontal moment on spudcan A decrease as the rotational stiffness increases, while the natural frequency, vertical load and horizontal load on spudcan A increase with the increasing rotational stiffness. And the responses for elastic-plastic model are close to the pin joint. The proposed modelling and analyzing method is effective and reliable, which could provide guidance for jack-up development and assessment. Key words: Jack-up; Fix joint; Pin joint; Linear springs; Elastic-plastic model; Numerical simulation
{"title":"Effects of Foundation Models on Jack-up Site Assessment","authors":"Z. Jian, Tan Wen-xian, Su Shi-jie, G. Chao","doi":"10.3968/J.ANS.1715787020120504.688","DOIUrl":"https://doi.org/10.3968/J.ANS.1715787020120504.688","url":null,"abstract":"In order to investigate effects of different foundation models on jack-up site assessment, numerical simulation of a jack-up is presented based on fix joint, pin joint, linear springs and elastic-plastic model. The hull, leg, hull-leg connection is modelled using equivalent beam, beam element, spring element, respectively. Environmental loads, such as steady current, wind, wave, inertial load and buoyancy, are also included in the numerical model. Static and natural frequency extraction analysis of the jack-up is then performed in elevated condition. Finally, static and natural response rules are proposed for the four foundation models. The results show that, the horizontal hull displacement, maximum leg stress, loads on spudcan B and horizontal moment on spudcan A decrease as the rotational stiffness increases, while the natural frequency, vertical load and horizontal load on spudcan A increase with the increasing rotational stiffness. And the responses for elastic-plastic model are close to the pin joint. The proposed modelling and analyzing method is effective and reliable, which could provide guidance for jack-up development and assessment. Key words: Jack-up; Fix joint; Pin joint; Linear springs; Elastic-plastic model; Numerical simulation","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84632675","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}
In the traditional teaching mode,students passively receive knowledge, in the way that hindered the development of students’ thinking. It limits training comprehensive analysis capabilities, innovation capability. The computational thinking is one of the basic objectives of teaching computer. This paper describes the methods of using computational thinking to analyze and solve problems, combined with C language programming with its characteristics, explained by an example in the theory and practice of teaching. After that, reform proposals put forward.
{"title":"Curriculum Reform of C Language Programming and Cultivation of Computational Thinking","authors":"Yuxin Zhang, Yan Ding","doi":"10.3968/6086","DOIUrl":"https://doi.org/10.3968/6086","url":null,"abstract":"In the traditional teaching mode,students passively receive knowledge, in the way that hindered the development of students’ thinking. It limits training comprehensive analysis capabilities, innovation capability. The computational thinking is one of the basic objectives of teaching computer. This paper describes the methods of using computational thinking to analyze and solve problems, combined with C language programming with its characteristics, explained by an example in the theory and practice of teaching. After that, reform proposals put forward.","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86167027","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 : 2014-12-26DOI: 10.3968/J.ANS.1715787020120504.1953
Lopang Maphale, Lucy Phalaagae
The spatial data plays a vital role in any developmental activities whether it is natural resource management or socio-economi c development. Most land-related government departments in Botswana have over the years since independence in 1966 developed systems to support their principal areas of operations as regards to spatial data. The adequacy and currency of spatial data in government operations improved leading to a need for integrated systems. This has progressively led to issues of building a National Spatial Data Infrastructure (NSDI) and an initiative modeled around Federal Geographic Data Committee (FGDC) has been established. Several facilitative committees were set and several meetings held in attempt to develop the idea to a realizable level and integrate it into the greater workings of the national economy. This noble idea has stalled for some time now and it is the intention of this paper to report on how the idea was initiated in Botswana and look at the probable causes for its stalling. The paper will then go ahead and suggest what could be done to revitalize the idea by relating it to what is considered the best practices in Spatial Data Infrastructure (SDI) programmes globally.
{"title":"National Spatial Data Infrastructure in Botswana – An Overview","authors":"Lopang Maphale, Lucy Phalaagae","doi":"10.3968/J.ANS.1715787020120504.1953","DOIUrl":"https://doi.org/10.3968/J.ANS.1715787020120504.1953","url":null,"abstract":"The spatial data plays a vital role in any developmental activities whether it is natural resource management or socio-economi c development. Most land-related government departments in Botswana have over the years since independence in 1966 developed systems to support their principal areas of operations as regards to spatial data. The adequacy and currency of spatial data in government operations improved leading to a need for integrated systems. This has progressively led to issues of building a National Spatial Data Infrastructure (NSDI) and an initiative modeled around Federal Geographic Data Committee (FGDC) has been established. Several facilitative committees were set and several meetings held in attempt to develop the idea to a realizable level and integrate it into the greater workings of the national economy. This noble idea has stalled for some time now and it is the intention of this paper to report on how the idea was initiated in Botswana and look at the probable causes for its stalling. The paper will then go ahead and suggest what could be done to revitalize the idea by relating it to what is considered the best practices in Spatial Data Infrastructure (SDI) programmes globally.","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79760612","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 : 2014-12-26DOI: 10.3968/J.ANS.1715787020120504.2019
J. Mazurkiewicz, P. Tomasik
Applying the Monte Carlo method, molecules of methanol, ethanol and 1-butanol are brought to temperature of 300 K and under the influence of external electric field of 0.01 a.u their electronic spectra are simulated with HyperChem 8.0 involving ZINDO/S semiempirical method. Particular molecules differently react to the electric field applied as shown by the electronic spectra simulated in the range of 250-2.84 nm. Total energy of the methanol and ethanol molecules turn slightly more negative in the electric field whereas that energy found for 1-butanol more significantly turn to less negative. HyperChem 8.0 software is used together with the AM1 method for optimization of the conformation of the molecules of methanol, ethanol, 1-propanol and 1-butanol. Then polarizability, charge distribution, potential and dipole moment for molecules placed in the external electric field of 0.000, 0.001, 0.01 and 0.05 a.u. are calculated. External field induces a slightly field strength dependent polarizability of the molecules and the electron density redistribution at particular atoms. Total dipole moment (DM) for particular alkanols increases with the strength of the field applied. There is particularly sharp increase in DM at 0.05 a.u. field. Key words: Butanol; Computer simulations; Ethanol; Methanol; Propanol
{"title":"Effect of External Electric Field upon Lower Alkanols","authors":"J. Mazurkiewicz, P. Tomasik","doi":"10.3968/J.ANS.1715787020120504.2019","DOIUrl":"https://doi.org/10.3968/J.ANS.1715787020120504.2019","url":null,"abstract":"Applying the Monte Carlo method, molecules of methanol, ethanol and 1-butanol are brought to temperature of 300 K and under the influence of external electric field of 0.01 a.u their electronic spectra are simulated with HyperChem 8.0 involving ZINDO/S semiempirical method. Particular molecules differently react to the electric field applied as shown by the electronic spectra simulated in the range of 250-2.84 nm. Total energy of the methanol and ethanol molecules turn slightly more negative in the electric field whereas that energy found for 1-butanol more significantly turn to less negative. HyperChem 8.0 software is used together with the AM1 method for optimization of the conformation of the molecules of methanol, ethanol, 1-propanol and 1-butanol. Then polarizability, charge distribution, potential and dipole moment for molecules placed in the external electric field of 0.000, 0.001, 0.01 and 0.05 a.u. are calculated. External field induces a slightly field strength dependent polarizability of the molecules and the electron density redistribution at particular atoms. Total dipole moment (DM) for particular alkanols increases with the strength of the field applied. There is particularly sharp increase in DM at 0.05 a.u. field. Key words: Butanol; Computer simulations; Ethanol; Methanol; Propanol","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89538348","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}
In order to analyze collusion stability in real economy under different cost structure, the fixed cost structure and variable cost structure is assumed under vertical differentiation and different competitive types (Cournot competition and Bertrand competition). By comparing the different competitive equilibrium, firm competes with each other under different cost structure and competitive types, which influences the stability of collusion in different ways. Under fixed cost and changeable cost structure, the high-quality firm is always more difficult to maintain collusion than the low-quality firm in vertical differentiation. With the increase of, the quality difference will get smaller and smaller, the high-quality becomes more and more difficult to maintain collusion. In equilibrium, price competition is fiercer, firms aim to release price competition under Bertrand competition, and so the quality difference will be bigger.
{"title":"The Analysis About Vertical Differentiation, Cost Structure and the Stability of Collusion","authors":"Huishuang He","doi":"10.3968/6199","DOIUrl":"https://doi.org/10.3968/6199","url":null,"abstract":"In order to analyze collusion stability in real economy under different cost structure, the fixed cost structure and variable cost structure is assumed under vertical differentiation and different competitive types (Cournot competition and Bertrand competition). By comparing the different competitive equilibrium, firm competes with each other under different cost structure and competitive types, which influences the stability of collusion in different ways. Under fixed cost and changeable cost structure, the high-quality firm is always more difficult to maintain collusion than the low-quality firm in vertical differentiation. With the increase of, the quality difference will get smaller and smaller, the high-quality becomes more and more difficult to maintain collusion. In equilibrium, price competition is fiercer, firms aim to release price competition under Bertrand competition, and so the quality difference will be bigger.","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91155976","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}
It is shown that photon angular distribution of electron-positron annihilation is consequence of Doppler’s effect in the reference frame of the electron and positron mass center. In the reference frame bound with electron the photon angular distribution is absent. But it is replaced by the Doppler’s shift of photon frequencies. The received results can be used in work of a positron-emission tomograph.
{"title":"The Reason of Photons Angular Distribution at Electron-Positron Annihilation in a Positron-Emission Tomograph","authors":"A. Volobuev, E. Mokin","doi":"10.3968/6062","DOIUrl":"https://doi.org/10.3968/6062","url":null,"abstract":"It is shown that photon angular distribution of electron-positron annihilation is consequence of Doppler’s effect in the reference frame of the electron and positron mass center. In the reference frame bound with electron the photon angular distribution is absent. But it is replaced by the Doppler’s shift of photon frequencies. The received results can be used in work of a positron-emission tomograph.","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85608940","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 : 2014-12-26DOI: 10.3968/J.ANS.1715787020120504.ZJ001
Jin Yuzi
With the population data of Jilin Province from the year 1949 to 2009 and valid population growth change rates, this paper intends to predict the population growth trend of Jilin province by a comparative study conducted under the Malthusian Population Model and Logistic Model and to explore the accuracy of these two models. It then comes to the conclusion that the population of Jilin province will reach the peak when it amounts to 33 million, that is to say, the net population growth rate tends to be a stable one, namely to be zero. Key words: Malthusian population model; Logistic model; Population growth rate; Comparison
{"title":"Study on Jilin Province’s Population Growth Trend Model","authors":"Jin Yuzi","doi":"10.3968/J.ANS.1715787020120504.ZJ001","DOIUrl":"https://doi.org/10.3968/J.ANS.1715787020120504.ZJ001","url":null,"abstract":"With the population data of Jilin Province from the year 1949 to 2009 and valid population growth change rates, this paper intends to predict the population growth trend of Jilin province by a comparative study conducted under the Malthusian Population Model and Logistic Model and to explore the accuracy of these two models. It then comes to the conclusion that the population of Jilin province will reach the peak when it amounts to 33 million, that is to say, the net population growth rate tends to be a stable one, namely to be zero. Key words: Malthusian population model; Logistic model; Population growth rate; Comparison","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89206940","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}
Dongdong Xu, Xiaoqiang Zhong, Jun Zhou, Qinwen Zhen, Yu Dong
As the current situation of imperfect model algorithm of electrical equipment for energy efficiency evaluation, we set up energy efficiency DEA model. In the model, we got average load rate, average power factor and tri-phase unbalance factor as inputs indexes. And we got economic output of per unit of power consumption and energy pollution as outputs indexes. Then we transformed multiple pollutants into a pollutant index through principal component analysis. And we got it as the desired output. The result of 12 industrial enterprises in the energy efficiency of electrical equipment shows that the evaluation model is suitable for energy efficiency evaluation and system analysis. The DEA model is useful to further improvement in the energy efficiency of equipment.
{"title":"Energy Efficiency Evaluation of Power Equipment Based on DEA","authors":"Dongdong Xu, Xiaoqiang Zhong, Jun Zhou, Qinwen Zhen, Yu Dong","doi":"10.3968/5896","DOIUrl":"https://doi.org/10.3968/5896","url":null,"abstract":"As the current situation of imperfect model algorithm of electrical equipment for energy efficiency evaluation, we set up energy efficiency DEA model. In the model, we got average load rate, average power factor and tri-phase unbalance factor as inputs indexes. And we got economic output of per unit of power consumption and energy pollution as outputs indexes. Then we transformed multiple pollutants into a pollutant index through principal component analysis. And we got it as the desired output. The result of 12 industrial enterprises in the energy efficiency of electrical equipment shows that the evaluation model is suitable for energy efficiency evaluation and system analysis. The DEA model is useful to further improvement in the energy efficiency of equipment.","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78388410","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 : 2014-12-26DOI: 10.3968/J.ANS.1715787020120504.2014
G. Bellotti
This paper has the objective of familiarising the reader with the guidelines and the main results of Electromagnetic Atomic Theory (EAT) published in Physics Essays and Applied Physics Research and looks at the potential new approaches to developing EAT in the future. Key words: Electromagnetic atomic theory; Complete relativity; Electron structure; Positron structure; Wave equation; Dynamic bi-Laplacian equation; Doppler effect of electromagnetic waves; Structure of the universe; Speculative fiction
{"title":"The Ideas Behind the Electromagnetic Atomic Theory","authors":"G. Bellotti","doi":"10.3968/J.ANS.1715787020120504.2014","DOIUrl":"https://doi.org/10.3968/J.ANS.1715787020120504.2014","url":null,"abstract":"This paper has the objective of familiarising the reader with the guidelines and the main results of Electromagnetic Atomic Theory (EAT) published in Physics Essays and Applied Physics Research and looks at the potential new approaches to developing EAT in the future. Key words: Electromagnetic atomic theory; Complete relativity; Electron structure; Positron structure; Wave equation; Dynamic bi-Laplacian equation; Doppler effect of electromagnetic waves; Structure of the universe; Speculative fiction","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91399555","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}
In order to make students understand dc motor performances, we design a virtual experiment platform of the armature-controlled DC motor. The block diagram of an armature-controlled DC motor is established based on the research of control parameters. Through analyzing of the control characteristic of the armature-controlled dc motor, we set up block diagram of a speed-control and a position-control of armature-controlled DC motor. The influence factors of speed-control and position-control are analyzed respectively. Simulink model of open-loop speed, speed-control, and position-control is established with MATLAB and Simulink software. Finally we do the experiments using the designed Virtual experiment platform. It was a challenging task to develop platform that provides the students with practical appreciation and understanding of dc motors including modeling, system identification and controller design.
{"title":"Virtual Experiment Research of Armature-Controlled DC Motor","authors":"Jie Duan, Xianyang Sun, Shubin Geng","doi":"10.3968/6228","DOIUrl":"https://doi.org/10.3968/6228","url":null,"abstract":"In order to make students understand dc motor performances, we design a virtual experiment platform of the armature-controlled DC motor. The block diagram of an armature-controlled DC motor is established based on the research of control parameters. Through analyzing of the control characteristic of the armature-controlled dc motor, we set up block diagram of a speed-control and a position-control of armature-controlled DC motor. The influence factors of speed-control and position-control are analyzed respectively. Simulink model of open-loop speed, speed-control, and position-control is established with MATLAB and Simulink software. Finally we do the experiments using the designed Virtual experiment platform. It was a challenging task to develop platform that provides the students with practical appreciation and understanding of dc motors including modeling, system identification and controller design.","PeriodicalId":7348,"journal":{"name":"Advances in Natural Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87288177","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：