Pub Date : 2008-10-31DOI: 10.1109/ISEIM.2008.4664435
S. Matsumoto, N. Shiroi, I. Suzuki, T. Akiba, M. Sobataka, K. Kasajima, Y. Shibuya, Y. Murooka, T. Kawamura
Measurement of partial discharge by electromagnetic method is widely used in high voltage testing. This paper deals with the three-axis loop antenna to detect the electromagnetic signal caused by partial discharge. The principle of the newly developed three-axis antenna and some experimental results are shown in this paper. Test result shows that the antenna has high sensitivity and space resolution for the directivity.
{"title":"Three-axis loop antenna for the detection of partial discharge signal","authors":"S. Matsumoto, N. Shiroi, I. Suzuki, T. Akiba, M. Sobataka, K. Kasajima, Y. Shibuya, Y. Murooka, T. Kawamura","doi":"10.1109/ISEIM.2008.4664435","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664435","url":null,"abstract":"Measurement of partial discharge by electromagnetic method is widely used in high voltage testing. This paper deals with the three-axis loop antenna to detect the electromagnetic signal caused by partial discharge. The principle of the newly developed three-axis antenna and some experimental results are shown in this paper. Test result shows that the antenna has high sensitivity and space resolution for the directivity.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126003457","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664469
T. Tanaka, K. Yokoyama, Y. Ohki, Y. Murata, Y. Sekiguchi, M. Goshowaki
This paper deals with initiation of light emission and electrical trees in LDPE/MgO nanocomposite. Specimens were prepared in such a way that a tungsten needle of 50 mum phi and 1mumR was inserted into dielectrics with a spacing of 0.4 mm between high voltage and ground. Light emission was observed by an ICCD camera, and tree shapes were examined by an optical microscope. As a result, it was found that light emission originates from electrical trees rather than electroluminescence in our experiments and that initiation of electrical trees and light emission are affected by the addition of nano MgO fillers. That is, it was clarified that applied voltage or electric stress for tree initiation tends to increase, as filler content increases in the range of 0 to 1 phr. In addition, tree length is shortened due to inclusion of nano-fillers.
本文研究了LDPE/MgO纳米复合材料的发光起始和电树。试样的制备方法是将一根50 μ m φ和1 μ m r的钨针插入高压与地间距为0.4 mm的电介质中。用ICCD相机观察光发射，用光学显微镜检查树的形状。实验结果表明，纳米MgO填料的加入影响了纳米MgO材料的电树发光，而不是电致发光。也就是说，在0到1 phr范围内，随着填料含量的增加，树形起始的施加电压或电应力趋于增加。此外，由于纳米填料的加入，树的长度也缩短了。
{"title":"High field light emission in LDPE/MgO nanocomposite","authors":"T. Tanaka, K. Yokoyama, Y. Ohki, Y. Murata, Y. Sekiguchi, M. Goshowaki","doi":"10.1109/ISEIM.2008.4664469","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664469","url":null,"abstract":"This paper deals with initiation of light emission and electrical trees in LDPE/MgO nanocomposite. Specimens were prepared in such a way that a tungsten needle of 50 mum phi and 1mumR was inserted into dielectrics with a spacing of 0.4 mm between high voltage and ground. Light emission was observed by an ICCD camera, and tree shapes were examined by an optical microscope. As a result, it was found that light emission originates from electrical trees rather than electroluminescence in our experiments and that initiation of electrical trees and light emission are affected by the addition of nano MgO fillers. That is, it was clarified that applied voltage or electric stress for tree initiation tends to increase, as filler content increases in the range of 0 to 1 phr. In addition, tree length is shortened due to inclusion of nano-fillers.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123966134","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664576
Yong-Up Park, Dong myung Kim, N. W. Lee
ACSR-OC(aluminum stranded conductors steel reinforced outdoor linked wires) wire is composed of the three type metals(aluminum, zinc, iron) and contacted with each other. So ACSR-OC wire is liable to occur the electrolytic corrosion when the conductive water solution exists. We carried out the test about the used ACSR-OC wires above 10 years in the real site and the new products in order to investigate the performance characteristic changed by a salt. Also we conducted the mechanical strength test, the component analysis(SEM) and the microscope observation of each samples. As a result of experiment, A component as a Al, O, Cl, Na has been detected in the wire surface of the used line. Also the wire has been already corroded or underway, therefore the mechanical strength of wire has been reduced.
{"title":"The investigation of the aluminum insulation wire characteristic change in the seashore area","authors":"Yong-Up Park, Dong myung Kim, N. W. Lee","doi":"10.1109/ISEIM.2008.4664576","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664576","url":null,"abstract":"ACSR-OC(aluminum stranded conductors steel reinforced outdoor linked wires) wire is composed of the three type metals(aluminum, zinc, iron) and contacted with each other. So ACSR-OC wire is liable to occur the electrolytic corrosion when the conductive water solution exists. We carried out the test about the used ACSR-OC wires above 10 years in the real site and the new products in order to investigate the performance characteristic changed by a salt. Also we conducted the mechanical strength test, the component analysis(SEM) and the microscope observation of each samples. As a result of experiment, A component as a Al, O, Cl, Na has been detected in the wire surface of the used line. Also the wire has been already corroded or underway, therefore the mechanical strength of wire has been reduced.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129567993","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664478
K. Iwai, M. Okada, N. Fuse, Y. Ohki, K. Fukunaga, M. Mizuno
Terahertz time-domain spectroscopy was measured as an effective procedure to analyze the mechanism that induces superior properties in polymer nanocomposites. The peak frequency of dielectric absorption appearing at frequencies 2.7 - 3.1 THz shifts to a lower frequency by the presence of nanofillers, which seems to be ascribable to the restriction of molecular motion at the interfaces between the polymer matrix and nanofillers.
{"title":"Terahertz dielectric relaxation spectroscopy in polyamide nanocomposite","authors":"K. Iwai, M. Okada, N. Fuse, Y. Ohki, K. Fukunaga, M. Mizuno","doi":"10.1109/ISEIM.2008.4664478","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664478","url":null,"abstract":"Terahertz time-domain spectroscopy was measured as an effective procedure to analyze the mechanism that induces superior properties in polymer nanocomposites. The peak frequency of dielectric absorption appearing at frequencies 2.7 - 3.1 THz shifts to a lower frequency by the presence of nanofillers, which seems to be ascribable to the restriction of molecular motion at the interfaces between the polymer matrix and nanofillers.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128894887","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664479
Gao Junguo, Zhang Jinmei, Ji Quanquan, L. Jiayin, Zhang Mingyan, Zhang Xiaohong
Polyethylene/montmorillonite (LDPE/MMT) nano-composites are prepared by melting intercalation process. The characteristics of electrical breakdown and partial discharge (PD) of the nano-composites are investigated. The test results indicate that electrical breakdown strength of LDPE/MMT is obviously higher than that of LDPE, up to 1.35~1.70 times at the test temperature of 333 ~ 363 K, especially. The results of PD test indicate that under the same test condition both the amplitude and numbers of PD are smaller than pure PE.
{"title":"Study on brekdown and paitial discharge of polyethylene/montmorillonite nanocomposites","authors":"Gao Junguo, Zhang Jinmei, Ji Quanquan, L. Jiayin, Zhang Mingyan, Zhang Xiaohong","doi":"10.1109/ISEIM.2008.4664479","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664479","url":null,"abstract":"Polyethylene/montmorillonite (LDPE/MMT) nano-composites are prepared by melting intercalation process. The characteristics of electrical breakdown and partial discharge (PD) of the nano-composites are investigated. The test results indicate that electrical breakdown strength of LDPE/MMT is obviously higher than that of LDPE, up to 1.35~1.70 times at the test temperature of 333 ~ 363 K, especially. The results of PD test indicate that under the same test condition both the amplitude and numbers of PD are smaller than pure PE.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121093907","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664560
Zhang Jinmei, Gao Junguo, L. Jiayin, Ji Quanquan, Zhang Mingyan, Zhang Xiaohong
In this paper polyethylene/montmorillonite nanocomposites are made by melt intercalated process. Electrical tree and partial discharge properties of original polyethylene and polyethylene/ montmorillonite nanocomposites are respectively investigated by the combined test system of electrical tree initiation and partial discharge measurement. The results show that most of electrical trees in polyethylene/ montmorillonite nanocomposites samples are bush-shaped, the length of electrical trees are about 230 mum, and the maximum partial discharge pulse height increases up to 140 pC at first 60 min, then partial discharge pulse height decreases gradually, almost none of discharge signal can be observed at 120 min. However, in original polyethylene samples, most of electrical trees are branch-shaped, the length are about 400 mum, and the maximum partial discharge pulse height continually increases up to 180 pC at the electrical stress applied to the samples for 120 min.
{"title":"Studies on electrical tree and partial discharge properties of PE/MMT nanocomposites","authors":"Zhang Jinmei, Gao Junguo, L. Jiayin, Ji Quanquan, Zhang Mingyan, Zhang Xiaohong","doi":"10.1109/ISEIM.2008.4664560","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664560","url":null,"abstract":"In this paper polyethylene/montmorillonite nanocomposites are made by melt intercalated process. Electrical tree and partial discharge properties of original polyethylene and polyethylene/ montmorillonite nanocomposites are respectively investigated by the combined test system of electrical tree initiation and partial discharge measurement. The results show that most of electrical trees in polyethylene/ montmorillonite nanocomposites samples are bush-shaped, the length of electrical trees are about 230 mum, and the maximum partial discharge pulse height increases up to 140 pC at first 60 min, then partial discharge pulse height decreases gradually, almost none of discharge signal can be observed at 120 min. However, in original polyethylene samples, most of electrical trees are branch-shaped, the length are about 400 mum, and the maximum partial discharge pulse height continually increases up to 180 pC at the electrical stress applied to the samples for 120 min.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121261283","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664544
S. Ochiai, J. Ramajothi, K. Kojima, T. Mizutani
The third-order nonlinear optical properties of regioregular poly(3-hexylthiophene) (RR-P3HT) thin films prepared on fused glass substrate were evaluated. The surface modification by hexamethyldisilazane (HMDS) and octadecyltrichlorosilane (ODTS) was performed on the glass substrate to enhance the optical property of the RR-P3HT thin films. The third-order optical susceptibilities chi(3) (-3omega; omega, omega, omega) of spin coated P3HT thin films on quartz glass substrate were estimated from optical third-harmonics (TH) intensity measurement using the Maker-fringe method. The orientation, alignment and crystallinity of the RR-P3HT thin films were evaluated using X-ray diffraction and UV-vis absorption spectra. An Nd:YAG laser with a wavelength of 1064 nm, a pulse width of 5 ns and a repetition frequency of 10 Hz was used to evaluate the TH intensity. The effect of surface modification of quartz glass substrate by HMDS and ODTS on the RR-P3HT film structure was also investigated. The third-order nonlinear optical susceptibility (chi(3)) of RR-P3HT thin films on quartz glass surface modified by ODTS is 1.90 times 10-8 esu.
{"title":"Third-order nonlinear optical properties of regioregular poly(3-hexylthiophene) thin film on quartz glass modified by HMDS and ODTS","authors":"S. Ochiai, J. Ramajothi, K. Kojima, T. Mizutani","doi":"10.1109/ISEIM.2008.4664544","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664544","url":null,"abstract":"The third-order nonlinear optical properties of regioregular poly(3-hexylthiophene) (RR-P3HT) thin films prepared on fused glass substrate were evaluated. The surface modification by hexamethyldisilazane (HMDS) and octadecyltrichlorosilane (ODTS) was performed on the glass substrate to enhance the optical property of the RR-P3HT thin films. The third-order optical susceptibilities chi(3) (-3omega; omega, omega, omega) of spin coated P3HT thin films on quartz glass substrate were estimated from optical third-harmonics (TH) intensity measurement using the Maker-fringe method. The orientation, alignment and crystallinity of the RR-P3HT thin films were evaluated using X-ray diffraction and UV-vis absorption spectra. An Nd:YAG laser with a wavelength of 1064 nm, a pulse width of 5 ns and a repetition frequency of 10 Hz was used to evaluate the TH intensity. The effect of surface modification of quartz glass substrate by HMDS and ODTS on the RR-P3HT film structure was also investigated. The third-order nonlinear optical susceptibility (chi(3)) of RR-P3HT thin films on quartz glass surface modified by ODTS is 1.90 times 10-8 esu.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121512464","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664528
B. Du, Yong Liu, Y. Xia, B.C. Liu
Biodegradable polymers are increasingly expected for substitute of present insulating materials in the electrical and electronic devices. However, their electrical properties are not systematically confirmed and need further investigation. In this paper, biodegradable polyethylene (BDPE) films are employed as the specimens and high density polyethylene (HDPE) films are as the reference. The breakdown endurance of BDPE film is examined using bias DC voltage under UV-irradiation environments. The images of breakdown craters are captured through applying a monocular-video-zoom microscope. Both breakdown area and box dimension of breakdown craters are obtained by an image-pattern-identification technique. The results reveal that for both BDPE and HDPE films, the breakdown voltage, breakdown area and box dimension all decrease with the increase of UV-irradiation level. Based on comparison of the results, it shows that under UV-irradiation environment, breakdown endurance of BDPE film is better than that of HDPE film.
{"title":"Breakdown phenomenon identification of biodegradable polyethylene film under UV-irradiation environment","authors":"B. Du, Yong Liu, Y. Xia, B.C. Liu","doi":"10.1109/ISEIM.2008.4664528","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664528","url":null,"abstract":"Biodegradable polymers are increasingly expected for substitute of present insulating materials in the electrical and electronic devices. However, their electrical properties are not systematically confirmed and need further investigation. In this paper, biodegradable polyethylene (BDPE) films are employed as the specimens and high density polyethylene (HDPE) films are as the reference. The breakdown endurance of BDPE film is examined using bias DC voltage under UV-irradiation environments. The images of breakdown craters are captured through applying a monocular-video-zoom microscope. Both breakdown area and box dimension of breakdown craters are obtained by an image-pattern-identification technique. The results reveal that for both BDPE and HDPE films, the breakdown voltage, breakdown area and box dimension all decrease with the increase of UV-irradiation level. Based on comparison of the results, it shows that under UV-irradiation environment, breakdown endurance of BDPE film is better than that of HDPE film.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123189575","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664472
I. Umeda, K. Tanaka, T. Kondo, K. Kondo, Y. Suzuki
An aged silicone polymer insulator, which had been used at testing station near sea coast for approx. 10 years, was investigated. The aging mode was different from erosion. It was confirmed that the rubber aging phenomena was similar to damage due to nitric acid by FT-IR analysis. It is deemed that the acid was generated during corona discharge on rubber housing. In order to avoid such a rubber aging, it is important to minimize corona discharge even under wet conditions.
{"title":"Acid aging of silicone rubber housing for polymer insulators","authors":"I. Umeda, K. Tanaka, T. Kondo, K. Kondo, Y. Suzuki","doi":"10.1109/ISEIM.2008.4664472","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664472","url":null,"abstract":"An aged silicone polymer insulator, which had been used at testing station near sea coast for approx. 10 years, was investigated. The aging mode was different from erosion. It was confirmed that the rubber aging phenomena was similar to damage due to nitric acid by FT-IR analysis. It is deemed that the acid was generated during corona discharge on rubber housing. In order to avoid such a rubber aging, it is important to minimize corona discharge even under wet conditions.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"42 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113938761","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664433
P. Jiang, Chonung Kim, Xingyi Huang, Fei Liu
During the growth of water trees in the XLPE cable insulation, the distribution of the electric field is modified because of the local change of the dielectric properties of the material. A better knowledge of the comparative danger for the different kinds of water trees could lead to a way of improving the quality of cable insulation. Numerical analysis results show that the dielectric permittivity of a water tree itself and its distribution inside it are so influential to the electric field intensity both in the tip and on the surface of the water tree that they may play important roles both in water tree inception and growth and in the morphology of water treeing.
{"title":"The influence of dielectric permittivity and its distribution on water tree initiation and growth in XLPE cables","authors":"P. Jiang, Chonung Kim, Xingyi Huang, Fei Liu","doi":"10.1109/ISEIM.2008.4664433","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664433","url":null,"abstract":"During the growth of water trees in the XLPE cable insulation, the distribution of the electric field is modified because of the local change of the dielectric properties of the material. A better knowledge of the comparative danger for the different kinds of water trees could lead to a way of improving the quality of cable insulation. Numerical analysis results show that the dielectric permittivity of a water tree itself and its distribution inside it are so influential to the electric field intensity both in the tip and on the surface of the water tree that they may play important roles both in water tree inception and growth and in the morphology of water treeing.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115387901","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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