Pub Date : 2014-01-01DOI: 10.3788/GXJS20144002.0156
柳翔 Liu Xiang, 励强华 Li Qianghua, 张岩宇 Zhang Yanyu, 周世伟 Zhou Shiwei
The time response relation of central position drift of FBG temperature sensor reflection wavelength is theoretically analyzed,influence of material,heat exchange coefficient,cladding and other factors on FBG temperature and time response speed is discussed.The temperature and time response characteristic of bare FBG in medium as well as the temperature and time response characteristic of FBG in cladding are respectively verified through experiment.Through experimental verification,the hysteresis quality of FBG sensor reflection wavelength central position drifts is greatly related to fiber optic materials,optical surface area and surface thermal conductance h.The larger the surface coefficient is,the shorter the retardation time of reflection wavelength central position drifts will be.The change rule conforms to the theoretical analysis results.
{"title":"Research of temperature response time hysteresis rule on fiber Bragg grating sensing","authors":"柳翔 Liu Xiang, 励强华 Li Qianghua, 张岩宇 Zhang Yanyu, 周世伟 Zhou Shiwei","doi":"10.3788/GXJS20144002.0156","DOIUrl":"https://doi.org/10.3788/GXJS20144002.0156","url":null,"abstract":"The time response relation of central position drift of FBG temperature sensor reflection wavelength is theoretically analyzed,influence of material,heat exchange coefficient,cladding and other factors on FBG temperature and time response speed is discussed.The temperature and time response characteristic of bare FBG in medium as well as the temperature and time response characteristic of FBG in cladding are respectively verified through experiment.Through experimental verification,the hysteresis quality of FBG sensor reflection wavelength central position drifts is greatly related to fiber optic materials,optical surface area and surface thermal conductance h.The larger the surface coefficient is,the shorter the retardation time of reflection wavelength central position drifts will be.The change rule conforms to the theoretical analysis results.","PeriodicalId":35591,"journal":{"name":"光学技术","volume":"40 1","pages":"156-159"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70263199","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 : 2014-01-01DOI: 10.3788/GXJS20144003.0214
许俊飞 Xu Junfei, 肖锋 Xiao Feng, 赵振刚 Zhao Zhengang, 代云洪 Dai Yunhong, 胡明耀 Hu Mingyao, 李川 Li Chuan
The quality and behavior of the molten metal can be defined by density,which is reflected the basic changes of the inter-atomic distance and coordination number of molten metal.A float-type fiber Bragg grating sensor is manufactured to measure the density of molten metal.The floater submerged in molten metal is controlled by buoyancy force. Through the driving rod,equal armed lever and connecting rod,pulling the equal strength cantilever beam,the deflection is changed.On the basis of detecting the wavelength shift of fiber Bragg grating which is pasted on the surface of cantilever beam the buoyancy values be obtained.The density of molten metal is detected.The theoretical sensitivity of the sensor is 0.115pm/(kg/m3).According to the four times experiment,the average density value of the molten metal is 7.574 ×103 kg/m3,which is less than the theoretical data for 7.621×103 kg/m3.The relative error is 0.62,the root mean square error is 117.371kg/m3.
{"title":"Float-type fiber Bragg grating sensor for measuring the density of molten metal","authors":"许俊飞 Xu Junfei, 肖锋 Xiao Feng, 赵振刚 Zhao Zhengang, 代云洪 Dai Yunhong, 胡明耀 Hu Mingyao, 李川 Li Chuan","doi":"10.3788/GXJS20144003.0214","DOIUrl":"https://doi.org/10.3788/GXJS20144003.0214","url":null,"abstract":"The quality and behavior of the molten metal can be defined by density,which is reflected the basic changes of the inter-atomic distance and coordination number of molten metal.A float-type fiber Bragg grating sensor is manufactured to measure the density of molten metal.The floater submerged in molten metal is controlled by buoyancy force. Through the driving rod,equal armed lever and connecting rod,pulling the equal strength cantilever beam,the deflection is changed.On the basis of detecting the wavelength shift of fiber Bragg grating which is pasted on the surface of cantilever beam the buoyancy values be obtained.The density of molten metal is detected.The theoretical sensitivity of the sensor is 0.115pm/(kg/m3).According to the four times experiment,the average density value of the molten metal is 7.574 ×103 kg/m3,which is less than the theoretical data for 7.621×103 kg/m3.The relative error is 0.62,the root mean square error is 117.371kg/m3.","PeriodicalId":35591,"journal":{"name":"光学技术","volume":"40 1","pages":"214-218"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70264480","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 : 2014-01-01DOI: 10.3788/GXJS20144006.0560
宋志平 Song Zhiping, 张明辉 Zhang Ming-hui, 洪. H. Jin, 乔延利 Qiao Yanli
A simple and precise method is proposed for assembling the modulator of an intensity modulation spectropolarimeter.The principle of the method is introduced,and the modulator is built based on the method.In order to verify the effectiveness of the method presented,the experimental device of the intensity modulation spectropolarimeter is assembled using the modulator built.The carriers produced by the modulator are measured and they are used demodulating the data measured by the experiment device.Experimental results show that the polarized degree of the light from a tungsten-halogen lamp collimator is less than 10%,but it is about 100% when the light is polarized by apolarizer in the spectral range of 525~700nm.These results are coincident with the theoretical results well,which verifies the feasibility of method proposed.
{"title":"Simple and precise method for assembling the modulator of an intensity modulation spectropolarimeter","authors":"宋志平 Song Zhiping, 张明辉 Zhang Ming-hui, 洪. H. Jin, 乔延利 Qiao Yanli","doi":"10.3788/GXJS20144006.0560","DOIUrl":"https://doi.org/10.3788/GXJS20144006.0560","url":null,"abstract":"A simple and precise method is proposed for assembling the modulator of an intensity modulation spectropolarimeter.The principle of the method is introduced,and the modulator is built based on the method.In order to verify the effectiveness of the method presented,the experimental device of the intensity modulation spectropolarimeter is assembled using the modulator built.The carriers produced by the modulator are measured and they are used demodulating the data measured by the experiment device.Experimental results show that the polarized degree of the light from a tungsten-halogen lamp collimator is less than 10%,but it is about 100% when the light is polarized by apolarizer in the spectral range of 525~700nm.These results are coincident with the theoretical results well,which verifies the feasibility of method proposed.","PeriodicalId":35591,"journal":{"name":"光学技术","volume":"40 1","pages":"560-564"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70266466","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 : 2014-01-01DOI: 10.3788/GXJS20144001.0013
李福瑞 Li Furui, 王俊红 Wang Junhong, 张. Z. Wei, 滕树云 Teng Shuyun
Visible light and near-infrared absorption of fiber are studied experimentally.With the polychromatic light illumination,the propagation loss of optical fiber is measured according to the fiber truncation method.The absorption coefficient of fiber is obtained through the simple calculation.Several absorption peaks of fiber are found in the absorption spectrum from 500nm to 1000nm.The corresponding explanation for these absorption peaks is given.
{"title":"The experimental study about visible and near infrared absorption of fiber","authors":"李福瑞 Li Furui, 王俊红 Wang Junhong, 张. Z. Wei, 滕树云 Teng Shuyun","doi":"10.3788/GXJS20144001.0013","DOIUrl":"https://doi.org/10.3788/GXJS20144001.0013","url":null,"abstract":"Visible light and near-infrared absorption of fiber are studied experimentally.With the polychromatic light illumination,the propagation loss of optical fiber is measured according to the fiber truncation method.The absorption coefficient of fiber is obtained through the simple calculation.Several absorption peaks of fiber are found in the absorption spectrum from 500nm to 1000nm.The corresponding explanation for these absorption peaks is given.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"13-15"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70262333","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 : 2014-01-01DOI: 10.3788/GXJS20144001.0094
郑. Z. Yan, 王然 Wang Ran, 叶. Y. Qing
It is an important method to measure the concentration of methane(CH4)by using 1.6μm laser differential absorption.By analyzing and calculating the absorption spectrum of CH4,based on a tunable Er∶YAG single frequency laser,the absorption of CH4 towards 1.645μm laser is measured experimentally.The results are useful for selecting the LIDAR's source for measuring the concentration of CH4.
{"title":"Measurement of the absorption spectrum of methane by using a tunable Er∶YAG single frequency laser","authors":"郑. Z. Yan, 王然 Wang Ran, 叶. Y. Qing","doi":"10.3788/GXJS20144001.0094","DOIUrl":"https://doi.org/10.3788/GXJS20144001.0094","url":null,"abstract":"It is an important method to measure the concentration of methane(CH4)by using 1.6μm laser differential absorption.By analyzing and calculating the absorption spectrum of CH4,based on a tunable Er∶YAG single frequency laser,the absorption of CH4 towards 1.645μm laser is measured experimentally.The results are useful for selecting the LIDAR's source for measuring the concentration of CH4.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"94-96"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70262904","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 : 2014-01-01DOI: 10.3788/GXJS20144003.0277
罗文飞 Luo Wenfei, 张. Z. Bin, 刘根 Liu Gen, 钟哲强 Zhong Zheqiang
Using the optical analysis software ASAP,the photoluminescence properties about Ce3+-doping YAG fluorescent ceramics are simulated.The results show that for a given Ce3+-doped density,with the increasing of the thickness of the fluorescent ceramics,the luminous flux of the white LED packaged by Ce3+-doping YAG fluorescent ceramics first increases and then decreases,whereas the correlated color temperature gradually decreases and then keeps a low value. The color coordinates keeps increasing to the yellow area in the CIE.There exists an optimal thickness of the fluorescent ceramics,resulting in the maximum luminous efficiency.Meanwhile,the optimal thickness of the fluorescent ceramics decreases with the increasing of the Ce3+-doped density.With the increasing of the packaging distance of the fluorescent ceramics to the LED chip,the luminous flux,color coordinates and efficiency of the white LED gradually increase,while the correlated color temperature gradually decreases,and the light of LED trends warm.
{"title":"Study on photoluminescence properties of Ce-doping YAG fluorescent ceramics packaging white LED","authors":"罗文飞 Luo Wenfei, 张. Z. Bin, 刘根 Liu Gen, 钟哲强 Zhong Zheqiang","doi":"10.3788/GXJS20144003.0277","DOIUrl":"https://doi.org/10.3788/GXJS20144003.0277","url":null,"abstract":"Using the optical analysis software ASAP,the photoluminescence properties about Ce3+-doping YAG fluorescent ceramics are simulated.The results show that for a given Ce3+-doped density,with the increasing of the thickness of the fluorescent ceramics,the luminous flux of the white LED packaged by Ce3+-doping YAG fluorescent ceramics first increases and then decreases,whereas the correlated color temperature gradually decreases and then keeps a low value. The color coordinates keeps increasing to the yellow area in the CIE.There exists an optimal thickness of the fluorescent ceramics,resulting in the maximum luminous efficiency.Meanwhile,the optimal thickness of the fluorescent ceramics decreases with the increasing of the Ce3+-doped density.With the increasing of the packaging distance of the fluorescent ceramics to the LED chip,the luminous flux,color coordinates and efficiency of the white LED gradually increase,while the correlated color temperature gradually decreases,and the light of LED trends warm.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"277-281"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70264348","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 : 2014-01-01DOI: 10.3788/GXJS20144002.0184
易涛 Yi Tao, 韦敏习 Wei Minxi, 侯立飞 Hou Lifei, 杨国洪 Yang Guohong, 李. L. Jun, 刘慎业 Liu Shenye
An aluminum target soft X ray tube is presented.This soft X ray tube shows good performance on imaging thin or light material samples such as biological specimen or membranes with better resolution and definition.The experimental test of the soft X ray tube using multilayer membrane and biological samples is presented.The result shows that the imaging quality is better than ordinary X ray tube because more soft X ray is absorbed by the sample and the proportion of the soft X-ray in the emission spectrum is changed by adjust the work voltage.The aluminum target X ray tube is very useful in biological imaging,material inspection and X ray microscopy.
{"title":"Study on a new soft X ray tube with Al target","authors":"易涛 Yi Tao, 韦敏习 Wei Minxi, 侯立飞 Hou Lifei, 杨国洪 Yang Guohong, 李. L. Jun, 刘慎业 Liu Shenye","doi":"10.3788/GXJS20144002.0184","DOIUrl":"https://doi.org/10.3788/GXJS20144002.0184","url":null,"abstract":"An aluminum target soft X ray tube is presented.This soft X ray tube shows good performance on imaging thin or light material samples such as biological specimen or membranes with better resolution and definition.The experimental test of the soft X ray tube using multilayer membrane and biological samples is presented.The result shows that the imaging quality is better than ordinary X ray tube because more soft X ray is absorbed by the sample and the proportion of the soft X-ray in the emission spectrum is changed by adjust the work voltage.The aluminum target X ray tube is very useful in biological imaging,material inspection and X ray microscopy.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"184-188"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70264390","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 : 2014-01-01DOI: 10.3788/GXJS20144004.0289
符媛英 Fu Yuanying, 李艳秋 Li Yanqiu, 刘晓林 Liu Xiaolin, 曹. C. Zhen, 刘. L. Ke
A simple and reliable method of tolerance analysis is proposed to ensure the performance of lithographic projection lens and minimize the manufacturing costs of lithographic projection lens.This method defines P-V wavefront error as merit function based on RMS wavefront error,and selects the optimal compensators.Compared to present methods,this method decreases mechanical complexity and minimizes the manufacturing costs by adopting less compensators,with both RMS wavefront error and P-V wavefront error achieving the requirement.As an example the method is applied to a refractive projection lens for 90nm resolution lithography projection lens designed by us.The results show that,only with 7compensators,RMS wavefront error and P-V wavefront error at 97.7%probability are less than 0.0412λand 0.2469λ,respectively.In conclusion,this method is able to meet the performance requirement of lithographic projection lens.
{"title":"A method of tolerance analysis for wavefront error of lithographic projection lens","authors":"符媛英 Fu Yuanying, 李艳秋 Li Yanqiu, 刘晓林 Liu Xiaolin, 曹. C. Zhen, 刘. L. Ke","doi":"10.3788/GXJS20144004.0289","DOIUrl":"https://doi.org/10.3788/GXJS20144004.0289","url":null,"abstract":"A simple and reliable method of tolerance analysis is proposed to ensure the performance of lithographic projection lens and minimize the manufacturing costs of lithographic projection lens.This method defines P-V wavefront error as merit function based on RMS wavefront error,and selects the optimal compensators.Compared to present methods,this method decreases mechanical complexity and minimizes the manufacturing costs by adopting less compensators,with both RMS wavefront error and P-V wavefront error achieving the requirement.As an example the method is applied to a refractive projection lens for 90nm resolution lithography projection lens designed by us.The results show that,only with 7compensators,RMS wavefront error and P-V wavefront error at 97.7%probability are less than 0.0412λand 0.2469λ,respectively.In conclusion,this method is able to meet the performance requirement of lithographic projection lens.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"41 1","pages":"289-294"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70264698","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 : 2014-01-01DOI: 10.3788/GXJS20144003.0282
郭琼 Guo Qiong, 李艳晓 Li Yanxiao, 孔东 Kong Dong
The high intensity dynamic infrared stimulator is placed in the field and projects a time dependent infrared beam toward the flying aircraft.The time dependent high intensity of the beam simulates the infrared emittance of an approaching missile in the 3to 5micron spectral range as sensed by a Missile Warning Systems.It is able to test the ability of the MWS to detect the threat and recognize in-flight.It is composed of two strong IR sources in the focus of a large reflective optics.The projected intensities are controlled by two motor driven sets of parallel slats,positioned in front of the optics,in the manner of a venetian blind.The intensity of the beam and the uniformity of the beam are measured.Experimental result show that the intensity of the beam is higher that 840W/sr,the uniformity of the beam is 89%,design scheme fully meet the design requirements.
{"title":"Investigation of high intensity dynamic infrared threat stimulator","authors":"郭琼 Guo Qiong, 李艳晓 Li Yanxiao, 孔东 Kong Dong","doi":"10.3788/GXJS20144003.0282","DOIUrl":"https://doi.org/10.3788/GXJS20144003.0282","url":null,"abstract":"The high intensity dynamic infrared stimulator is placed in the field and projects a time dependent infrared beam toward the flying aircraft.The time dependent high intensity of the beam simulates the infrared emittance of an approaching missile in the 3to 5micron spectral range as sensed by a Missile Warning Systems.It is able to test the ability of the MWS to detect the threat and recognize in-flight.It is composed of two strong IR sources in the focus of a large reflective optics.The projected intensities are controlled by two motor driven sets of parallel slats,positioned in front of the optics,in the manner of a venetian blind.The intensity of the beam and the uniformity of the beam are measured.Experimental result show that the intensity of the beam is higher that 840W/sr,the uniformity of the beam is 89%,design scheme fully meet the design requirements.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"282-285"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70264884","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 : 2014-01-01DOI: 10.3788/GXJS20144004.0313
郝殿中 Hao Dianzhong, 韩培高 Han Peigao, 牛明生 Niu Mingsheng
In order to study the effects of band structure and optical properties of TiO2films and Zr-doped TiO2films to its photocatalytic,TiO2films and Zr-doped TiO2films are prepared by electron beam gun evaporation on glass.The optical properties and absorption spectra of TiO2films and Zr-doped TiO2films are characterized by UV-visible spectrometry and Raman spectrometer.Analysis results show that:the anatase phase films obtained at annealing temperature of 773Kare mainly composed of TiO2,the energy band gap is decreased owing to the doped Zr,the optical absorption coefficients are increased in the region of350~450nm,a red shift of absorption band can be found,the photo catalytic activity of TiO2is enhanced.
{"title":"Optical properties and photocatalytic of Zr-doped TiO_2 films","authors":"郝殿中 Hao Dianzhong, 韩培高 Han Peigao, 牛明生 Niu Mingsheng","doi":"10.3788/GXJS20144004.0313","DOIUrl":"https://doi.org/10.3788/GXJS20144004.0313","url":null,"abstract":"In order to study the effects of band structure and optical properties of TiO2films and Zr-doped TiO2films to its photocatalytic,TiO2films and Zr-doped TiO2films are prepared by electron beam gun evaporation on glass.The optical properties and absorption spectra of TiO2films and Zr-doped TiO2films are characterized by UV-visible spectrometry and Raman spectrometer.Analysis results show that:the anatase phase films obtained at annealing temperature of 773Kare mainly composed of TiO2,the energy band gap is decreased owing to the doped Zr,the optical absorption coefficients are increased in the region of350~450nm,a red shift of absorption band can be found,the photo catalytic activity of TiO2is enhanced.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"56 1","pages":"313-315"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70264980","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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