The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Masahiko Takeda - One of the best experts on this subject based on the ideXlab platform.
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long Term Variation of ampere force by geomagnetic sq currents and thermospheric pressure difference
Journal of Geophysical Research, 2016Co-Authors: Masahiko TakedaAbstract:The long-Term Variation of the Ampere force exerted by geomagnetic Sq currents was studied in relation to the thermospheric pressure. First, the long-Term trend of the pressure difference was estimated using a linear regression coefficient based on a high correlation between the Ampere force and the pressure difference in recent years. The pressure difference may be inferred from solar parameters such as solar sunspot number, inspection of the difference from Sq has a merit that it gives the "response" of the thermosphere in contrast with the "input" parameters of the solar activity index. Next, the effect of the version up of sunspot number was examined. The correlation of the Ampere force with sunspot number updated in 2015 (Ver. 2) is slightly higher than that with old sunspot number (Ver. 1), which suggests that the later version is an improved index for the solar activity and its effect on the state of the thermosphere. Last, the correlation between total Sq currents and sunspot number was found to be less than that between the Ampere force and sunspot number, although the difference is small and could not be statistically significant. This suggests that the geomagnetic main field affects the relation between the Ampere force and the pressure difference.
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contribution of wind conductivity and geomagnetic main field to the Variation in the geomagnetic sq field
Journal of Geophysical Research, 2013Co-Authors: Masahiko TakedaAbstract:[1] Long-Term Variation in the geomagnetic Sq field and the cause of the Variation were examined. The amplitude of the geomagnetic Y component (Sq(Y)) in equinox was averaged for each year and adopted as a proxy of the Sq field. Sq(Y) was combined with the ionospheric conductivity estimated by the International Reference Ionosphere model to deTermine the dynamo electric field and neutral wind velocity by using the geomagnetic main field strength. It was found that the solar activity dependence of the Sq field could be almost completely attributed to the conductivity Variation, and neutral winds tend to decrease when the solar activity increases. Although the long-Term Variation in the dynamo field differed among observatories, these differences were mostly attributed to the locality of the geomagnetic secular Variation, whereas the Variations in neutral wind amplitude were nearly the same in all regions. On the other hand, no clear long-Term Variation in neutral wind was detected other than that by solar activity.
Jerzy Banbura - One of the best experts on this subject based on the ideXlab platform.
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Long-Term Variation in hemoglobin concentration in nestling great tits Parus major.
Comparative biochemistry and physiology. Part A Molecular & integrative physiology, 2015Co-Authors: Adam Kalinski, Miroslawa Banbura, Joanna Skwarska, Michal Glądalski, Marcin Markowski, Piotr Zieliński, Iwona Cyżewska, Jarosław Wawrzyniak, Jerzy BanburaAbstract:Abstract Several studies have previously proposed that blood hemoglobin concentration in nestling passerines is a reliable index of individual condition and nutritional state. In this paper we present results concerning Variation in hemoglobin concentration in the blood of ca. 14-day-old nestling great tits Parus major in central Poland in an 11-year-long period, 2003–2013, in two distinct habitat types: urban park and deciduous forest. The most important findings of the study were: (i) Variation in hemoglobin concentration was consistent within broods, (ii) hemoglobin concentration of nestlings varied markedly across years, (iii) hemoglobin concentration was significantly higher in the forest study site which is richer in Terms of food abundance during the short period of tits breeding season and (iv) high hemoglobin level was a predictor of nestling survival from hatching to fledging.
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Long-Term Variation in Blood Glucose Concentration in Nestling Great Tits (Parus major):
Avian Biology Research, 2015Co-Authors: Adam Kalinski, Miroslawa Banbura, Joanna Skwarska, Michal Glądalski, Marcin Markowski, Piotr Zieliński, Jarosłtaw Wawrzyniak, Iwona Cyżewska, Jerzy BanburaAbstract:The main aim of this study was to examine if blood glucose concentration displays any pattern of Variation between years and distinct habitats. Bird blood glucose concentration reflects their high ...
Irena Spasic - One of the best experts on this subject based on the ideXlab platform.
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acronyms as an integral part of multi word Term recognition a token of appreciation
IEEE Access, 2018Co-Authors: Irena SpasicAbstract:Term conflation is the process of linking together different variants of the same Term. In automatic Term recognition approaches, all Term variants should be aggregated into a single normalized Term representative, which is associated with a single domain-specific concept as a latent variable. In a previous study, we described FlexiTerm, an unsupervised method for recognition of multiword Terms from a domain-specific corpus. It uses a range of methods to normalize three types of Term Variation—orthographic, morphological, and syntactic Variations. Acronyms, which represent a highly productive type of Term Variation, were not supported. In this paper, we describe how the functionality of FlexiTerm has been extended to recognize acronyms and incorporate them into the Term conflation process. The main contribution of this paper is not acronym recognition per se, but rather its integration with other types of Term Variation into the Term conflation process. We evaluated the effects of Term conflation in the context of information retrieval as one of its most prominent applications. On average, relative recall increased by 32 points, whereas index compression factor increased by 7% points. Therefore, evidence suggests that integration of acronyms provides nontrivial improvement of Term conflation.
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Acronyms as an Integral Part of Multi-Word Term Recognition – A Token of Appreciation
IEEE Access, 2018Co-Authors: Irena SpasicAbstract:Term conflation is the process of linking together different variants of the same Term. In automatic Term recognition approaches, all Term variants should be aggregated into a single normalized Term representative, which is associated with a single domain-specific concept as a latent variable. In a previous study, we described FlexiTerm, an unsupervised method for recognition of multiword Terms from a domain-specific corpus. It uses a range of methods to normalize three types of Term Variation—orthographic, morphological, and syntactic Variations. Acronyms, which represent a highly productive type of Term Variation, were not supported. In this paper, we describe how the functionality of FlexiTerm has been extended to recognize acronyms and incorporate them into the Term conflation process. The main contribution of this paper is not acronym recognition per se, but rather its integration with other types of Term Variation into the Term conflation process. We evaluated the effects of Term conflation in the context of information retrieval as one of its most prominent applications. On average, relative recall increased by 32 points, whereas index compression factor increased by 7% points. Therefore, evidence suggests that integration of acronyms provides nontrivial improvement of Term conflation.
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automatic acronym acquisition and Term Variation management within domain specific texts
Language Resources and Evaluation, 2002Co-Authors: Goran Nenadic, Irena Spasic, Sophia AnaniadouAbstract:In this paper we present a framework for the effective management of Terms and their variants that are automatically acquired from domain-specific texts. In our approach, the Term variant recognition is incorporated in the automatic Term retrieval process by taking into account orthographical, morphological, syntactic, lexico-semantic and pragmatic Term Variations. In particular, we address acronyms as a common way of introducing Term variants in scientific papers. We describe a method for the automatic acquisition of newly introduced acronyms and the mapping to their ‘meanings’, i.e. the corresponding Terms. The proposed three-step procedure is based on morpho-syntactic constraints that are commonly used in acronym definitions. First, acronym definitions containing an acronym and the corresponding Term are retrieved. These two elements are matched in the second step by performing morphological analysis of words and combining forms constituting the Term. The problems of acronym Variation and acronym ambiguity are addressed in the third step by establishing classes of Term variants that correspond to specific concepts. We present the results of the acronym acquisition in the domain of molecular biology: the precision of the method ranged from 94% to 99% depending on the size of the corpus used for evaluation, whilst the recall was 73%.
J Nakajima - One of the best experts on this subject based on the ideXlab platform.
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Observation of short Term Variation of Jovian synchrotron radiation at a frequency of 2290MHz
Advances in Space Research, 2000Co-Authors: Yoshizumi Miyoshi, Hiroaki Misawa, Akira Morioka, Tetsuro Kondo, Yusei Koyama, J NakajimaAbstract:Abstract The detailed observation of Jovian decimetric radiation (DIM) from relativistic electrons in the Jovian radiation belt has been carried out to seek the existence of its short Term Variation. In the observation, the terrestrial atmospheric extinction effect was corrected using the sky tipping method. Moreover, the back ground confusion which was the serious problem of the past observations was also evaluated. As the result, the DIM flux enhancement with a duration of a few days in November 1996 was confirmed. The data also showed the changes of the magnetic latitude beaming curves during the flux enhancement. These results showed that the relativistic electrons in Jovian radiation belt which has been thought to be stable has a short Term Variation.
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Observation of short‐Term Variation of Jupiter's synchrotron radiation
Geophysical Research Letters, 1999Co-Authors: Yoshizumi Miyoshi, Hiroaki Misawa, Akira Morioka, Tetsuro Kondo, Yasuhiro Koyama, J NakajimaAbstract:Detailed observations of Jovian decimetric radiation (DIM) from relativistic electrons in the inner Jovian radiation belt was carried out to seek the existence of a short-Term Variation which has information on the electromagnetic disturbances in the inner Jovian magnetosphere. Results demonstrated the DIM flux enhancement continuing for a few days for the case of November 1996. It was shown that the relativistic electrons were highly anisotropic during the DIM flux enhancement. The correlation between the DIM flux enhancement and the solar F10.7 flux enhancement was also detected. A model simulation suggested that the observed DIM flux Variation was caused by the enhanced radial diffusion due to the intense solar UV/EUV event which heated the Jupiter's upper atmosphere.
Adam Kalinski - One of the best experts on this subject based on the ideXlab platform.
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Long-Term Variation in hemoglobin concentration in nestling great tits Parus major.
Comparative biochemistry and physiology. Part A Molecular & integrative physiology, 2015Co-Authors: Adam Kalinski, Miroslawa Banbura, Joanna Skwarska, Michal Glądalski, Marcin Markowski, Piotr Zieliński, Iwona Cyżewska, Jarosław Wawrzyniak, Jerzy BanburaAbstract:Abstract Several studies have previously proposed that blood hemoglobin concentration in nestling passerines is a reliable index of individual condition and nutritional state. In this paper we present results concerning Variation in hemoglobin concentration in the blood of ca. 14-day-old nestling great tits Parus major in central Poland in an 11-year-long period, 2003–2013, in two distinct habitat types: urban park and deciduous forest. The most important findings of the study were: (i) Variation in hemoglobin concentration was consistent within broods, (ii) hemoglobin concentration of nestlings varied markedly across years, (iii) hemoglobin concentration was significantly higher in the forest study site which is richer in Terms of food abundance during the short period of tits breeding season and (iv) high hemoglobin level was a predictor of nestling survival from hatching to fledging.
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Long-Term Variation in Blood Glucose Concentration in Nestling Great Tits (Parus major):
Avian Biology Research, 2015Co-Authors: Adam Kalinski, Miroslawa Banbura, Joanna Skwarska, Michal Glądalski, Marcin Markowski, Piotr Zieliński, Jarosłtaw Wawrzyniak, Iwona Cyżewska, Jerzy BanburaAbstract:The main aim of this study was to examine if blood glucose concentration displays any pattern of Variation between years and distinct habitats. Bird blood glucose concentration reflects their high ...
