Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158269
R. Schlanbusch, E. Oland, P. J. Nicklasson
In this paper we present dynamics and control of a spacecraft in an elliptic orbit. Our contribution is modeling and determination of the angular velocity of the satellite orbit reference frame using a Local Vertical/Local Horizontal (LVLH) orbit reference frame and an orbit propagator without the constraint of no out of plane motion. A non-linear passivity-based sliding surface controller is derived, uniformly asymptotically stability (UAS) is proven, and the control law is adapted to work for magnetic torquers. Simulations are performed on a CubeSat model showing the performance of our model and controller.
{"title":"Modeling and simulation of a cubesat using nonlinear control in an elliptic orbit","authors":"R. Schlanbusch, E. Oland, P. J. Nicklasson","doi":"10.1109/RAST.2009.5158269","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158269","url":null,"abstract":"In this paper we present dynamics and control of a spacecraft in an elliptic orbit. Our contribution is modeling and determination of the angular velocity of the satellite orbit reference frame using a Local Vertical/Local Horizontal (LVLH) orbit reference frame and an orbit propagator without the constraint of no out of plane motion. A non-linear passivity-based sliding surface controller is derived, uniformly asymptotically stability (UAS) is proven, and the control law is adapted to work for magnetic torquers. Simulations are performed on a CubeSat model showing the performance of our model and controller.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115419864","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158182
H. Bayraktar, B. Bayram
Southeast Anatolia Region was subject to a large flood disaster whose severity is expected only once each 100 years in November 2006. Several people died or injured after a very heavy rain fell which outlast nearly 3 hours. Nonetheless government made a strong effort to interfere the casualties. Before and after images of TERRA/ASTER satellite were used to analyse the effects of the disaster. Before image was gathered on May and after image was gathered on November. November image was registered onto May image with a very accurate rectification process in spite of a huge seasonal difference. Land use and land cover classification using an object oriented method has been performed on the study area. VNIR, SWIR and TIR bands of both satellite images were included in classification process. Fuzzy image segmentation was attempted using scale parameters of 5, 10, 20 and 30 on both images. Pre-flood and post-flood classification results were fulfilled according to the scale parameter of “5”. Even though the date of the post-flood image 4 days after the flood, affected regions were determined by courtesy of object oriented fuzzy classification process.
{"title":"Fuzzy logic analysis of flood disaster monitoring and assessment of damage in SE Anatolia Turkey","authors":"H. Bayraktar, B. Bayram","doi":"10.1109/RAST.2009.5158182","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158182","url":null,"abstract":"Southeast Anatolia Region was subject to a large flood disaster whose severity is expected only once each 100 years in November 2006. Several people died or injured after a very heavy rain fell which outlast nearly 3 hours. Nonetheless government made a strong effort to interfere the casualties. Before and after images of TERRA/ASTER satellite were used to analyse the effects of the disaster. Before image was gathered on May and after image was gathered on November. November image was registered onto May image with a very accurate rectification process in spite of a huge seasonal difference. Land use and land cover classification using an object oriented method has been performed on the study area. VNIR, SWIR and TIR bands of both satellite images were included in classification process. Fuzzy image segmentation was attempted using scale parameters of 5, 10, 20 and 30 on both images. Pre-flood and post-flood classification results were fulfilled according to the scale parameter of “5”. Even though the date of the post-flood image 4 days after the flood, affected regions were determined by courtesy of object oriented fuzzy classification process.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126001374","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158241
N. H. Kaplan, I. Erer, S. Kent
A new edge detection algorithm based on the subband decomposition using lattice filter structures is presented. The method is used for the edge detection of remote sensing images. The image is decomposed into subband images using 1-D lattice filters, these sub-images are combined in the subband domain using a predefined rule and edges of the image are detected.
{"title":"Edge detection in remote sensing images via lattice filters based subband decomposition","authors":"N. H. Kaplan, I. Erer, S. Kent","doi":"10.1109/RAST.2009.5158241","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158241","url":null,"abstract":"A new edge detection algorithm based on the subband decomposition using lattice filter structures is presented. The method is used for the edge detection of remote sensing images. The image is decomposed into subband images using 1-D lattice filters, these sub-images are combined in the subband domain using a predefined rule and edges of the image are detected.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125312593","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158184
Merve Melek, M. O. Kaya
In this paper, the supersonic flutter behaviors of functionally graded panels are analyzed by using the Differential Transformation Method (DTM). The material properties are assumed to be graded in the thickness direction and the Mori-Tanaka scheme and a simple power-law are used to estimate the effective material properties. The structural formulation is based on Classical Plate Theory (CPT) and the aerodynamic loading is formulated using quasi-steady supersonic piston theory. The governing equations are derived using the Hamilton's principle.
{"title":"Supersonic flutter prediction of functionally graded panel","authors":"Merve Melek, M. O. Kaya","doi":"10.1109/RAST.2009.5158184","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158184","url":null,"abstract":"In this paper, the supersonic flutter behaviors of functionally graded panels are analyzed by using the Differential Transformation Method (DTM). The material properties are assumed to be graded in the thickness direction and the Mori-Tanaka scheme and a simple power-law are used to estimate the effective material properties. The structural formulation is based on Classical Plate Theory (CPT) and the aerodynamic loading is formulated using quasi-steady supersonic piston theory. The governing equations are derived using the Hamilton's principle.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117013820","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158178
K. Krezhov
Substitution is a feasible means in designing novel functional materials with perovskite-like structure. Both A- and B- sites of the perovskite structure could be affected. We show that the magnetic interactions and other electronic properties of important materials such as colossal magnetoresistive (CMR) hexagonal double perovskites and manganates, or multiferroic RMn2O5 (R=rare earth metal) could be influenced but to understand why the compound does not display the expected properties calls for detailed information on microscopic level. Indeed, unlike ferromagnetic and half metallic Sr2FeMoO6, which is a paradigmatic CMR compound, lack of long-range magnetic ordering and spin glass behavior was established in Ba2MSbO6 (M=Fe, Co) due to a significant antisite disorder. In the parent charge ordered Bi0.5A0.5FexMn1-xO3 (A=Ca, Sr) substitution with Fe3+ for Mn3+ destroyed the charge order known to hamper CMR behavior without to induce magnetoresistive effect. Similarly, although partial substitution of Mn seems to be the way to increase the crosslink between magnetization and electric polarization in multiferroic YbMn2O5 we found that it introduces a low level of disorder between the two transition metal positions in the YbFeMnO5 structure. The lack of evidence for a crystallographic phase transition to a polar space group rules out expectations of a spontaneous electric polarization. In addition, the observed collinear magnetic structure with k = 0 does not permit a spin polarization and, therefore, YbMnFeO5 is not expected to be a multiferroic compound.
{"title":"Substitution effects on orbital ordering and multiferroicity in some perovskite-like candidates for advanced functional materials","authors":"K. Krezhov","doi":"10.1109/RAST.2009.5158178","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158178","url":null,"abstract":"Substitution is a feasible means in designing novel functional materials with perovskite-like structure. Both A- and B- sites of the perovskite structure could be affected. We show that the magnetic interactions and other electronic properties of important materials such as colossal magnetoresistive (CMR) hexagonal double perovskites and manganates, or multiferroic RMn<inf>2</inf>O<inf>5</inf> (R=rare earth metal) could be influenced but to understand why the compound does not display the expected properties calls for detailed information on microscopic level. Indeed, unlike ferromagnetic and half metallic Sr<inf>2</inf>FeMoO<inf>6</inf>, which is a paradigmatic CMR compound, lack of long-range magnetic ordering and spin glass behavior was established in Ba<inf>2</inf>MSbO<inf>6</inf> (M=Fe, Co) due to a significant antisite disorder. In the parent charge ordered Bi<inf>0.5</inf>A<inf>0.5</inf>Fe<inf>x</inf>Mn<inf>1-x</inf>O<inf>3</inf> (A=Ca, Sr) substitution with Fe<sup>3+</sup> for Mn<sup>3+</sup> destroyed the charge order known to hamper CMR behavior without to induce magnetoresistive effect. Similarly, although partial substitution of Mn seems to be the way to increase the crosslink between magnetization and electric polarization in multiferroic YbMn<inf>2</inf>O<inf>5</inf> we found that it introduces a low level of disorder between the two transition metal positions in the YbFeMnO<inf>5</inf> structure. The lack of evidence for a crystallographic phase transition to a polar space group rules out expectations of a spontaneous electric polarization. In addition, the observed collinear magnetic structure with k = 0 does not permit a spin polarization and, therefore, YbMnFeO<inf>5</inf> is not expected to be a multiferroic compound.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129492055","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158273
K. Tomita-Yokotani, K. Baba, Y. Hasegawa, H. Hashimoto, M. Yamashita
Space is a challenging field for science engineering and education. Cosmo Flower 2008 is a payload on the International Space Station coordinated by Japan Manned Space Systems Corporation (JAMSS). Science team, local governments and civilians get together to send flower seeds to space. This mission aims to create a legend of space, which will be shared by everyone. Seeds of plants including Japanese cherry are sent to space. Those trees were selected nation wide, and their seeds were collected by the local people. Space flown seeds will be returned to the original place, and planted there for a memoir of space flight. We propose to extend this kind of space mission to all over the world. Each nation and area has their own special flowers or plant species of their love. It turns to the firm basis of space development, and strong support of people on it.
{"title":"Cosmo Flower 2008 mission for legend and education - Connection with plant science under space environment","authors":"K. Tomita-Yokotani, K. Baba, Y. Hasegawa, H. Hashimoto, M. Yamashita","doi":"10.1109/RAST.2009.5158273","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158273","url":null,"abstract":"Space is a challenging field for science engineering and education. Cosmo Flower 2008 is a payload on the International Space Station coordinated by Japan Manned Space Systems Corporation (JAMSS). Science team, local governments and civilians get together to send flower seeds to space. This mission aims to create a legend of space, which will be shared by everyone. Seeds of plants including Japanese cherry are sent to space. Those trees were selected nation wide, and their seeds were collected by the local people. Space flown seeds will be returned to the original place, and planted there for a memoir of space flight. We propose to extend this kind of space mission to all over the world. Each nation and area has their own special flowers or plant species of their love. It turns to the firm basis of space development, and strong support of people on it.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"17 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129272195","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158238
Marinela Nidelea, N. Jula, K. Izet-Unsalan, C. Racuciu, A. Dascalescu, D. Unsalan
Within the European Politics for Geographic Information, geographic information represents a complex part in continuous development of informational society having a wide range of applicability. This can be categorized into: spatial, geographic information and descriptive, qualitative information. These two types of data can be integrated in the same information management system by a Geographic Informational System. (GIS).
{"title":"Techniques of aquisition, processing and validation of satellite images","authors":"Marinela Nidelea, N. Jula, K. Izet-Unsalan, C. Racuciu, A. Dascalescu, D. Unsalan","doi":"10.1109/RAST.2009.5158238","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158238","url":null,"abstract":"Within the European Politics for Geographic Information, geographic information represents a complex part in continuous development of informational society having a wide range of applicability. This can be categorized into: spatial, geographic information and descriptive, qualitative information. These two types of data can be integrated in the same information management system by a Geographic Informational System. (GIS).","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129469466","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158233
D. Krezhova, I. Iliev, O. Yanev, E. Kirova
The effects of different salt concentration treatment of soybean plants and the occurrence of salinity stress have been assessed from a comparative analysis of remotely sensed ground-based spectral reflectance data and biochemical parameters. The contents of phenols, proline, malondialdehid, hydrogen peroxide, thiol groups, and chlorophyll a and b have been determined. The soybean plants were grown under controlled conditions as water cultures on Helrigel nutrient solution. Salinity was performed at the stage of 2nd to 4th trifoliate expanded leaves by adding of NaCl in the nutrient solution in concentrations 40 mM and 80 mM. The leaf spectral reflectance was measured in laboratory in the visible and near infrared spectral ranges using a fibre-optic multichannel spectrometer. An algorithm based on multivariate statistical analysis of the leaf reflectance spectra was developed. It includes Student's t-criterion, discriminant analysis and derivative analysis. The spectral intervals of interest were the green, red, red-edge and near infrared ranges of the spectrum. Statistically significant differences at p≪0.05 were found between the leaf spectral reflectance data of control and treated plants at 80 mM NaCl in all of the ranges examined with the exception of the near infrared range. No statistically significant differences were established at 40 mM NaCl treatment. Some of the biochemical parameters (proline, malondialdehid, thiol groups) were found at salinity treatment by 40 mM NaCl to increase in value more than 10% while the chlorophyll a and b concentrations decreased more than 20%. This trend was preserved for the 80 mM NaCl treatment as the corresponding parameters changed by about 45% on average, which is symptomatic for the stressed plants.
通过对遥感地面光谱反射率数据和生化参数的对比分析，评价了不同盐浓度处理对大豆植株的影响和盐胁迫的发生。测定了酚类、脯氨酸、丙二酚、过氧化氢、巯基、叶绿素a和叶绿素b的含量。采用Helrigel营养液，在控制条件下对大豆植株进行水培养。在40 mM和80 mM浓度的营养液中加入NaCl，对三叶草膨大第2 ~ 4叶进行盐度处理，利用光纤多通道光谱仪在实验室测量叶片可见光和近红外光谱范围的光谱反射率。提出了一种基于叶片反射光谱多元统计分析的算法。它包括学生t准则、判别分析和导数分析。感兴趣的光谱区间是光谱的绿色、红色、红边和近红外范围。在80mm NaCl条件下，除近红外波段外，对照和处理植株的叶片光谱反射率数据在所有检测范围内均存在统计学上的显著差异(p < 0.05)。在40 mM NaCl处理下，差异无统计学意义。部分生化指标(脯氨酸、丙二酚、硫醇)在40 mM NaCl盐度处理下升高10%以上，叶绿素a、b浓度下降20%以上。这一趋势在80 mM NaCl处理下保持不变，相应的参数平均变化约45%，这是胁迫植株的症状。
{"title":"Assessment of the effect of salinity on the early growth stage of soybean plants (Glycine max L.)","authors":"D. Krezhova, I. Iliev, O. Yanev, E. Kirova","doi":"10.1109/RAST.2009.5158233","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158233","url":null,"abstract":"The effects of different salt concentration treatment of soybean plants and the occurrence of salinity stress have been assessed from a comparative analysis of remotely sensed ground-based spectral reflectance data and biochemical parameters. The contents of phenols, proline, malondialdehid, hydrogen peroxide, thiol groups, and chlorophyll a and b have been determined. The soybean plants were grown under controlled conditions as water cultures on Helrigel nutrient solution. Salinity was performed at the stage of 2nd to 4th trifoliate expanded leaves by adding of NaCl in the nutrient solution in concentrations 40 mM and 80 mM. The leaf spectral reflectance was measured in laboratory in the visible and near infrared spectral ranges using a fibre-optic multichannel spectrometer. An algorithm based on multivariate statistical analysis of the leaf reflectance spectra was developed. It includes Student's t-criterion, discriminant analysis and derivative analysis. The spectral intervals of interest were the green, red, red-edge and near infrared ranges of the spectrum. Statistically significant differences at p≪0.05 were found between the leaf spectral reflectance data of control and treated plants at 80 mM NaCl in all of the ranges examined with the exception of the near infrared range. No statistically significant differences were established at 40 mM NaCl treatment. Some of the biochemical parameters (proline, malondialdehid, thiol groups) were found at salinity treatment by 40 mM NaCl to increase in value more than 10% while the chlorophyll a and b concentrations decreased more than 20%. This trend was preserved for the 80 mM NaCl treatment as the corresponding parameters changed by about 45% on average, which is symptomatic for the stressed plants.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123469430","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158179
L. Aydın, H. Seçil Artem
This study considers multi-objective optimal design of the fiber reinforced symmetric-balanced laminated composites using genetic algorithms. MATLAB Genetic Algorithm and Direct Search Toolbox is used to obtain Pareto-optimal design for three different model problems. The objectives of the problems are to maximize the Young's moduli and minimize the coefficient of thermal expansion (CTE) simultaneously for 8 and 16 layered carbon/epoxy composites. Simplified micromechanics equations and classical lamination theory are used in order to obtain the fitness functions of the problems. Stress and strain distributions are presented through the thickness of the laminates for the optimized problems under mechanical and thermal loadings.
{"title":"Multiobjective Genetic Algorithm optimization of the composite laminates as a satellite structure material for coefficient of thermal expansion and elastic modulus","authors":"L. Aydın, H. Seçil Artem","doi":"10.1109/RAST.2009.5158179","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158179","url":null,"abstract":"This study considers multi-objective optimal design of the fiber reinforced symmetric-balanced laminated composites using genetic algorithms. MATLAB Genetic Algorithm and Direct Search Toolbox is used to obtain Pareto-optimal design for three different model problems. The objectives of the problems are to maximize the Young's moduli and minimize the coefficient of thermal expansion (CTE) simultaneously for 8 and 16 layered carbon/epoxy composites. Simplified micromechanics equations and classical lamination theory are used in order to obtain the fitness functions of the problems. Stress and strain distributions are presented through the thickness of the laminates for the optimized problems under mechanical and thermal loadings.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124125241","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 : 2009-06-11DOI: 10.1109/RAST.2009.5158234
I. Iliev, D. Krezhova, O. Yanev, E. Kirova, V. Alexieva
The chlorophyll fluorescence in response to salinity stress of soybean plants in spectral range 650–850 nm and slow transient fluorescence kinetics were investigated using remote sensing techniques. The soybean plants were grown under controlled conditions as water cultures on nutrient solution of Helrigel. Salinity was performed at the stage of 2nd to 4th trifoliate expanded leaves by adding of NaCl in the nutrient solution at concentrations 40 mM and 80 mM. The chlorophyll fluorescence was registered by a multichannel fiber optic spectrometer USB2000 working in time-acquisition mode. As a source of actinic light, a light emitting diode with the maximum of the light output at 470 nm was used. The fluorescence spectra were registered subsequently in time at every 2 second. At least 40 spectra from each soybean leaf were obtained; the leaves being taken from 20 control plants and 20 plants treated with two NaCl concentrations. Measurements were conducted on the 14th day after treatment. Several indices such as fluorescence spectra area, halfwidth of the fluorescence spectral curve, and wavelength of spectrum maximum were used to characterize the differences between the normalized fluorescence spectra of leaves of control and treated plants. The Student t-criterion, discriminant analysis and derivative analysis were applied to estimate the statistical significance of the differences between the average values of the indices. The results revealed that the low NaCl concentration led to salinity tolerance while the high NaCl concentration caused salinity stress in the soybean plants.
{"title":"Response of chlorophyll fluorescence to salinity stress on the early growth stage of the soybean plants (Glycine max L.)","authors":"I. Iliev, D. Krezhova, O. Yanev, E. Kirova, V. Alexieva","doi":"10.1109/RAST.2009.5158234","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158234","url":null,"abstract":"The chlorophyll fluorescence in response to salinity stress of soybean plants in spectral range 650–850 nm and slow transient fluorescence kinetics were investigated using remote sensing techniques. The soybean plants were grown under controlled conditions as water cultures on nutrient solution of Helrigel. Salinity was performed at the stage of 2nd to 4th trifoliate expanded leaves by adding of NaCl in the nutrient solution at concentrations 40 mM and 80 mM. The chlorophyll fluorescence was registered by a multichannel fiber optic spectrometer USB2000 working in time-acquisition mode. As a source of actinic light, a light emitting diode with the maximum of the light output at 470 nm was used. The fluorescence spectra were registered subsequently in time at every 2 second. At least 40 spectra from each soybean leaf were obtained; the leaves being taken from 20 control plants and 20 plants treated with two NaCl concentrations. Measurements were conducted on the 14th day after treatment. Several indices such as fluorescence spectra area, halfwidth of the fluorescence spectral curve, and wavelength of spectrum maximum were used to characterize the differences between the normalized fluorescence spectra of leaves of control and treated plants. The Student t-criterion, discriminant analysis and derivative analysis were applied to estimate the statistical significance of the differences between the average values of the indices. The results revealed that the low NaCl concentration led to salinity tolerance while the high NaCl concentration caused salinity stress in the soybean plants.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128014146","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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