INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019最新文献

{"title":"A possible low-energy positron source at Jefferson Lab","authors":"S. Benson, B. Wojtsekhowski, B. Vlahovic, S. Golge","doi":"10.1063/1.5135843","DOIUrl":"https://doi.org/10.1063/1.5135843","url":null,"abstract":"Jefferson Lab is interested in the production of positrons for nuclear physics applications but also has the capability of producing low energy positrons that could be used for positron annihilation studies. Using the LERF accelerator at the Thomas Jefferson National Accelerator Facility, it is possible to produce a high brightness source of very low-energy positrons. The accelerator requirements are well within the capabilities of the installed hardware. For these experiments, we only need run at up to 120 MeV. A challenge is the production of the positrons. The gamma converter must be able to absorb the 50 kW of beam power that the linac delivers. At this low an energy, the converter, though challenging, is feasible. The transport of the low energy positrons from the production target to the next stage, where the energy is reduced even further, must have a very large acceptance to be able to efficiently transport the flux of positrons from the positron production target to the moderator. We propose to accomplish such a transport by means of a guiding solenoidal field with a novel endcap design. Finally, it is in principle possible to produce a spin polarized beam by filtering the positrons at low energy. The layout of the proposed device will be described in this presentation.Jefferson Lab is interested in the production of positrons for nuclear physics applications but also has the capability of producing low energy positrons that could be used for positron annihilation studies. Using the LERF accelerator at the Thomas Jefferson National Accelerator Facility, it is possible to produce a high brightness source of very low-energy positrons. The accelerator requirements are well within the capabilities of the installed hardware. For these experiments, we only need run at up to 120 MeV. A challenge is the production of the positrons. The gamma converter must be able to absorb the 50 kW of beam power that the linac delivers. At this low an energy, the converter, though challenging, is feasible. The transport of the low energy positrons from the production target to the next stage, where the energy is reduced even further, must have a very large acceptance to be able to efficiently transport the flux of positrons from the positron production target to the moderator. We propose to a...","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130241384","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}

{"title":"4f imaging system method to determine optical properties of thin film magnetic material","authors":"N. Franata, F. P. Sari, Lukman Hakim, A. Sudarmaji, Handoyo, D. Handoko","doi":"10.1063/1.5141642","DOIUrl":"https://doi.org/10.1063/1.5141642","url":null,"abstract":"In recent years, X-ray has been attracting enormous attention as a tool to determine the magnetic properties of thin film material. We have constructed a simple method base on 4F imaging system to determine analytically optical properties of thin film material. Very small narrow slit is applied to yield diffraction and interference pattern in the X-ray scale. It was found that the sequential changes of Fraunhofer diffraction pattern due to slit width variation. Sensitivity of the method was validated by measuring the power distribution of the temporal observed patterns. The object shape was also varied for comprehensive discussion.","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132947853","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}

{"title":"Solution of time independent cosmic string using supersymmetry quantum mechanics method for trigonometric non-central potentials system","authors":"C. Cari, D. Anggraini, A. Suparmi, M. Ma’arif","doi":"10.1063/1.5141621","DOIUrl":"https://doi.org/10.1063/1.5141621","url":null,"abstract":"Supersymmetry quantum mechanics method had been used to solve the time independent cosmic string equation for trigonometric non-central potential system. Variable separation method was applied to the time independent cosmic string equation, and three one-dimensional Schrodinger equation had been obtained. Radial wave functions, angular wave functions, azimuthal wave functions, and energy levels were analyzed using supersymmetry quantum mechanics method. The effect of the trigonometric non-central potential caused energy levels to increase. Energy levels for ≠ λ0 ≠ κ,0 ≠ ϖ,0, a ≠0, and b ≠0 had a higher value than energy levels for = λO = κ,0 = ϖ,0, a =0, and b = 0. The increased value of parameter λ, parameter κ, parameter ϖ, parameter a , parameter b , and the decreased of the cosmic string parameter a, caused an increase in energy levels.Supersymmetry quantum mechanics method had been used to solve the time independent cosmic string equation for trigonometric non-central potential system. Variable separation method was applied to the time independent cosmic string equation, and three one-dimensional Schrodinger equation had been obtained. Radial wave functions, angular wave functions, azimuthal wave functions, and energy levels were analyzed using supersymmetry quantum mechanics method. The effect of the trigonometric non-central potential caused energy levels to increase. Energy levels for ≠ λ0 ≠ κ,0 ≠ ϖ,0, a ≠0, and b ≠0 had a higher value than energy levels for = λO = κ,0 = ϖ,0, a =0, and b = 0. The increased value of parameter λ, parameter κ, parameter ϖ, parameter a , parameter b , and the decreased of the cosmic string parameter a, caused an increase in energy levels.","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133105173","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}

{"title":"Investigation of free volumes in phthalocyanines and perylene","authors":"O. Melikhova, J. Čížek, P. Hruška, T. Vlasák, P. Fitl, M. Novotný","doi":"10.1063/1.5135868","DOIUrl":"https://doi.org/10.1063/1.5135868","url":null,"abstract":"Phthalocyanine and perylene are aromatic organic compounds. Metal complexes can be derived from phthalocyanine by substituting H2 in the central ring of the molecule by a metal ion. In the present work, positron annihilation spectroscopy was employed for characterization of the size distribution and local chemical environment of free volumes in perylene, phthalocyanine and its complexes with metals. The size distribution of free volumes was determined from the pick-off annihilation lifetimes of ortho-positronium. The local chemical environment of positron annihilation sites was characterized by the coincidence Doppler broadening spectroscopy.Phthalocyanine and perylene are aromatic organic compounds. Metal complexes can be derived from phthalocyanine by substituting H2 in the central ring of the molecule by a metal ion. In the present work, positron annihilation spectroscopy was employed for characterization of the size distribution and local chemical environment of free volumes in perylene, phthalocyanine and its complexes with metals. The size distribution of free volumes was determined from the pick-off annihilation lifetimes of ortho-positronium. The local chemical environment of positron annihilation sites was characterized by the coincidence Doppler broadening spectroscopy.","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115326724","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}

{"title":"Crop growth prediction model at vegetative phase to support the precision agriculture application in plant factory","authors":"A. Rizkiana, A. P. Nugroho, Muhammad Irfan, L. Sutiarso, T. Okayasu","doi":"10.1063/1.5141717","DOIUrl":"https://doi.org/10.1063/1.5141717","url":null,"abstract":"","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"275 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115942705","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}

{"title":"Analysis of positron lifetime spectra using the PALSfit3 program","authors":"Jens V. Olsen, P. Kirkegaard, M. Eldrup","doi":"10.1063/1.5135837","DOIUrl":"https://doi.org/10.1063/1.5135837","url":null,"abstract":"A brief description is given of the most recent version of the PALSfit3 program. Based on previous programs (PALSfit and PATFIT) which have been used by a number of positron annihilation groups, PALSfit3 has been extended to include the option of log-normal broadening of the lifetime components. In addition more detailed graphics output has been added, and the possibility to select output in spread sheet format included. A special feature is the possibility to exclude certain channel ranges in a lifetime spectrum from the analysis, which may be valuable if spectra contain ”bumps”, for example due to scattered positrons in beam experiments. Details of PALSfit3 can be found on the PALSfit web page (www.palsfit.dk).A brief description is given of the most recent version of the PALSfit3 program. Based on previous programs (PALSfit and PATFIT) which have been used by a number of positron annihilation groups, PALSfit3 has been extended to include the option of log-normal broadening of the lifetime components. In addition more detailed graphics output has been added, and the possibility to select output in spread sheet format included. A special feature is the possibility to exclude certain channel ranges in a lifetime spectrum from the analysis, which may be valuable if spectra contain ”bumps”, for example due to scattered positrons in beam experiments. Details of PALSfit3 can be found on the PALSfit web page (www.palsfit.dk).","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124585416","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}

{"title":"Science literation ability and physics concept understanding in the topic of work and energy with inquiry-STEM","authors":"M. Hudha, J. R. Batlolona, W. Wartono","doi":"10.1063/1.5141676","DOIUrl":"https://doi.org/10.1063/1.5141676","url":null,"abstract":"This study aimed to determine the effect of inquiry-STEM learning on improving scientific literacy competencies and physics concepts understanding with different classes. The research sample was 40 students. The instrument used was a scientific literacy competency test and concepts understanding as many as 25 and 10 questions. Based on hypothesis testing using the t-test test, it was obtained a comparison of the increase in scientific literacy competencies namely tcount (0.29) ttable (1.68). Conclusions from the results of scientific literacy competency research and understanding of concepts show that, 1) Improvement of students’ scientific literacy competencies that studied with inquiry-STEM learning was not different compared to students who studied with conventional learning. 2) Improvement of students’ concepts understanding with inquiry-STEM learning was higher than students who studied with conventional learning. Thus, the inquiry-STEM learning model can improve scientific literacy competencies and students’ physics concepts understanding.This study aimed to determine the effect of inquiry-STEM learning on improving scientific literacy competencies and physics concepts understanding with different classes. The research sample was 40 students. The instrument used was a scientific literacy competency test and concepts understanding as many as 25 and 10 questions. Based on hypothesis testing using the t-test test, it was obtained a comparison of the increase in scientific literacy competencies namely tcount (0.29) ttable (1.68). Conclusions from the results of scientific literacy competency research and understanding of concepts show that, 1) Improvement of students’ scientific literacy competencies that studied with inquiry-STEM learning was not different compared to students who studied with conventional learning. 2) Improvement of students’ concepts understanding with inquiry-STEM learning was higher than students who studied with con...","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124593085","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}

{"title":"A model for joint processing of LT and CDB spectra of dielectric nano-sized powders","authors":"P. Stepanov, F. A. Selim, S. Stepanov, V. Byakov","doi":"10.1063/1.5135836","DOIUrl":"https://doi.org/10.1063/1.5135836","url":null,"abstract":"A model that allows interpretation of positron annihilation spectra (LT and CDB) in nanodispersed dielectric powders is developed. Model takes into account e+ capture by vacancy-type defects, formation of e+ surface-bound states, as well as the formation of quasi-free positronium (inside crystallites) which may escape into intergranular space where it becomes thermalized during elastic collisions. The process of annihilation of ortho-Ps is narrowed down to its conversion into the para-state as a result of collisions with oxygen molecules (O2) adsorbed on the surface of crystallites. A computer program for lifetime spectra fitting that accounts on the parameters of the above model is developed (with ROOT framework). Combination of the program with our CDB software allows joint processing of the LT and CDB annihilation spectra of nanopowders.A model that allows interpretation of positron annihilation spectra (LT and CDB) in nanodispersed dielectric powders is developed. Model takes into account e+ capture by vacancy-type defects, formation of e+ surface-bound states, as well as the formation of quasi-free positronium (inside crystallites) which may escape into intergranular space where it becomes thermalized during elastic collisions. The process of annihilation of ortho-Ps is narrowed down to its conversion into the para-state as a result of collisions with oxygen molecules (O2) adsorbed on the surface of crystallites. A computer program for lifetime spectra fitting that accounts on the parameters of the above model is developed (with ROOT framework). Combination of the program with our CDB software allows joint processing of the LT and CDB annihilation spectra of nanopowders.","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114416307","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}

{"title":"Crystallinity and electrical properties of silicon dioxide (SiO2) from rice straw","authors":"N. Har, Irzaman, Irmansyah","doi":"10.1063/1.5141641","DOIUrl":"https://doi.org/10.1063/1.5141641","url":null,"abstract":"Rice straw is agro-waste that contain celluloses (32–47%), hemicelluloses (19–27%), lignin (5-24%) and ash (13–20%). The ash of rice straw has a high component of silicon dioxide (SiO2). This study aims to determine the effect variation of temperature on the extraction process, to assess crystallinity and electrical properties of silicon dioxide from rice straw. Based on the results and analysis, the influence of the combustion shown that the increase in temperature, will reduce the purity of the silicon dioxide. The composition of each treatment still contained the impurities at 3% of HCl solution consisted of carbon, calcium, and potassium. The structural characteristics obtained are samples in the amorphous phase. The electrical components of the sample are semiconductors and have the best dielectric constant at a temperature treatment of 800 C.Rice straw is agro-waste that contain celluloses (32–47%), hemicelluloses (19–27%), lignin (5-24%) and ash (13–20%). The ash of rice straw has a high component of silicon dioxide (SiO2). This study aims to determine the effect variation of temperature on the extraction process, to assess crystallinity and electrical properties of silicon dioxide from rice straw. Based on the results and analysis, the influence of the combustion shown that the increase in temperature, will reduce the purity of the silicon dioxide. The composition of each treatment still contained the impurities at 3% of HCl solution consisted of carbon, calcium, and potassium. The structural characteristics obtained are samples in the amorphous phase. The electrical components of the sample are semiconductors and have the best dielectric constant at a temperature treatment of 800 C.","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114949373","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}

{"title":"Hydrophobic of polyethylene/SiO2 modified coating for self cleaning material","authors":"L. Silvia, Iqroatul Hasanah, M. Zainuri","doi":"10.1063/1.5141617","DOIUrl":"https://doi.org/10.1063/1.5141617","url":null,"abstract":"SiO2 based on silica sand material was successfully introduced as hydrophobic material. Polyethylene/SiO2 modified were prepared by dip-coating methods for self-cleaning material. SiO2 has made from silica sand will be achieved by a simple and efficient way. Polyethylene/SiO2 modified coating is applied to ITO glass at a different phase of SiO2 quartz, amorphous, and cristobalite. The effects of different phase on the hydrophobic property of SiO2 were studied, and the performances were characterized by X-ray fluorescence spectrometer (XRF), X-ray powder diffraction (XRD), Particle size analyzer (PSA), UV-Vis, and Water contact angle (WCA) to investigate the element composition, crystal structure, size of particles, transparency, and hydrophobicity of the prepared samples respectively. The results showed that the contact angle of polyethylene/SiO2 modified coatings was more than 90° when applied at ITO glass. The maximum hydrophobicity properties of polyethylene/SiO2 modified coating was about 116°.","PeriodicalId":243773,"journal":{"name":"INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124047715","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}