Bibliographies thématiques / Polar parameters

Littérature scientifique sur le sujet « Polar parameters »

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Publié le 25 mai 2024

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Articles de revues sur le sujet "Polar parameters"

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J K Pendharkar, J. K. Pendharkar, et Veena Khilnani. « Acoustic Parameters of Polar- Non polar Chemicals at Variable Frequencies ». Indian Journal of Applied Research 3, no 7 (1 octobre 2011) : 588–90. http://dx.doi.org/10.15373/2249555x/july2013/186.

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Dierer, Silke, et Katharina Heinke Schluenzen. « In fluence parameters for a polar mesocyclone development ». Meteorologische Zeitschrift 14, no 6 (19 décembre 2005) : 781–92. http://dx.doi.org/10.1127/0941-2948/2005/0077.

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Giese, Bernd, et Wolf Mehl. « Polar parameters for radical substituents ». Tetrahedron Letters 32, no 34 (janvier 1991) : 4275–78. http://dx.doi.org/10.1016/s0040-4039(00)92147-6.

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McCarthy, Dennis D. « Requirements for Earth Rotation Parameters ». Highlights of Astronomy 7 (1986) : 63–64. http://dx.doi.org/10.1017/s1539299600006183.

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AbstractObservations of Earth orientation parameters (polar motion and Universal Time) have reached a level of accuracy which challenges the definition of the reference systems which these observations seek to relate. Observational accuracies of better than in polar motion and in Universal Time are now routinely available. Urgent requirements therefore exist now for the IAU to take a fresh look at the concepts and definitions of the reference systems as well as reference frames. Of particular concern are the definitons of the equinox, the terrestrial reference pole, the zero of longitude and sidereal time.
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Zhao, Chen-Yang, Chi-Fai Cheung et Wen-Peng Fu. « An Investigation of the Cutting Strategy for the Machining of Polar Microstructures Used in Ultra-Precision Machining Optical Precision Measurement ». Micromachines 12, no 7 (27 juin 2021) : 755. http://dx.doi.org/10.3390/mi12070755.

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In this paper, an investigation of cutting strategy is presented for the optimization of machining parameters in the ultra-precision machining of polar microstructures, which are used for optical precision measurement. The critical machining parameters affecting the surface generation and surface quality in the machining of polar microstructures are studied. Hence, the critical ranges of machining parameters have been determined through a series of cutting simulations, as well as cutting experiments. First of all, the influence of field of view (FOV) is investigated. After that, theoretical modeling of polar microstructures is built to generate the simulated surface topography of polar microstructures. A feature point detection algorithm is built for image processing of polar microstructures. Hence, an experimental investigation of the influence of cutting tool geometry, depth of cut, and groove spacing of polar microstructures was conducted. There are transition points from which the patterns of surface generation of polar microstructures vary with the machining parameters. The optimization of machining parameters and determination of the optimized cutting strategy are undertaken in the ultra-precision machining of polar microstructures.
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Ou, Shui-Ping, Sen Wang, Xu-Mei Zhou et Ling Chen. « Solubility Behaviour of Baicalin in Polar and Non-Polar Solvents : Solubility Parameters Approach ». Asian Journal of Chemistry 27, no 7 (2015) : 2401–5. http://dx.doi.org/10.14233/ajchem.2015.17854.

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Golubkin, Pavel, Julia Smirnova et Leonid Bobylev. « Satellite-Derived Spatio-Temporal Distribution and Parameters of North Atlantic Polar Lows for 2015–2017 ». Atmosphere 12, no 2 (6 février 2021) : 224. http://dx.doi.org/10.3390/atmos12020224.

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A list of North Atlantic polar lows was compiled for 2015–2017. A total of 131 polar lows were found by analyzing the Moderate Resolution Imaging Spectroradiometer (MODIS) infrared imagery and auxiliary information. The study region was additionally divided by the 20° W meridian to assess possible differences in the polar lows occurring in the western and eastern parts of the region. The highest polar low activity was found over the Barents Sea and the northern Norwegian Sea. A large number of polar lows over this region were dual or multiple. When considering such systems as a single event, more polar lows were found in 2015 over the Labrador Sea and southern Davis Strait, which is the region with the second highest number of polar lows. High interannual variability of polar low frequency was noted, which was more pronounced in the western part of the region. During the analyzed period, the largest number of polar lows occurred in January for the western part of the region and in February for the eastern part. The main polar low parameters were similar within the region, with the mean values slightly higher in the western part of the region, but all extreme high values were observed in the eastern part.
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Sobia, Iren. « Fluctuations of Solar Wind Parameters During Polar Reversal ». American Journal of Astronomy and Astrophysics 3, no 3 (2015) : 56. http://dx.doi.org/10.11648/j.ajaa.20150303.15.

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van Leeuwen, M. E. « Derivation of Stockmayer potential parameters for polar fluids ». Fluid Phase Equilibria 99 (août 1994) : 1–18. http://dx.doi.org/10.1016/0378-3812(94)80018-9.

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Dudev, T., et B. Galabov. « Relationship between infrared intensity theories : Electro-optical parameters and bond polar parameters ». Spectrochimica Acta Part A : Molecular Spectroscopy 48, no 8 (août 1992) : 1153–63. http://dx.doi.org/10.1016/0584-8539(92)80126-h.

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Thèses sur le sujet "Polar parameters"

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Saha, Ujjwal. « Dielectric relaxation parameters of polar liquids from ultra-high frequency conductivity of solutes in non-polar solvents ». Thesis, University of North Bengal, 1993. http://hdl.handle.net/123456789/660.

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Ramsch, Roland. « Catanionic surfactants in polar cohesive solvents : impact of solvent physical parameters on their aggregation behavior ». Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1005/.

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On trouve peu d'études, dans la littérature, sur les tensioactifs (TA) catanioniques - formés d'une paire d'ions entre un TA anionique et un TA cationique - en milieu nonaqueux. Nous avons voulu rationaliser, dans ce travail, le comportement d'agr´egation de ce type de tensioactifs en les étudiant comparativement dans l'eau, dans le formamide, dans le glycérol et dans des mélanges de ces solvants polaires et cohésifs. Nous avons pour ce faire synthétis´e trois différents types de TA catanioniques (alcanoate d'alkylammonium, tétradécanoate de norbornène méthylène ammonium, alcanoate de N-alkylammonium-1-d´eoxy-D-glucitol). Les TA catanioniques ont la propriété de s'agréger en vésicules dans l'eau. Dans le cas des autres solvants ou mélanges des solvants, nous avons constat que le type d'agrégat que forment les TA catanioniques dépend de deux principaux facteurs : la constante diélectrique du solvant et le degré d'interaction entre les deux TA. En effet, le formamide ayant une constante diélectrique plus élevée que l'eau, il exerce une force dissociative sur la paire d'ions qui peut ainsi être séparée pour conduire `a un mélange de TA ioniques monocaténaires formant alors des micelles. D'autre part, une augmentation de l'effet hydrophobe, obtenu en utilisant des chaînes hydrophobes plus longues, renforce la paire d'ions et conduit `a la formation de vésicules dans le formamide pur. Par ailleurs, l'étude du système tétradécanoate de norbornène méthylène ammonium a également montré l'importance des interactions hydrophobes entre les têtes polaires, un autre facteur pouvant favoriser la formation de vésicules dans le formamide pur
In the literature, little work has been done on catanionic surfactants in non-aqueous solution. Catanionic surfactants are ion pairs composed of an anionic and a cationic surfactant. In the frame of this work, we wanted to rationalize the aggregation behavior of this surfactant type by studying them in water, in formamide, in glycerol and in some mixtures of these polar and cohesive solvents. For this issue, we synthesized three different types of catanionic surfactants (alkylammonium alkanoate, norbornene methyleneammonium tetradecanoate, N-alkylammonium-1-deoxy-D-glucitol alkanoate). Catanionic surfactants usually form vesicles in water. In the case of non-aqueous solvents and mixtures of solvents, we could observe that the type of aggregates formed with catanionic surfactants depends on two major factors: the dielectric constant of the solvent and the degree of interaction between the two surfactants. Effectively, formamide having a higher dielectric constant than water exerts a dissociative force on the ion pair. The ion pair can be separated leading to a mixture of monocatenar ionic surfactants, which then forms micelles. On the other hand, hydrophobic effects can be increased using longer hydrophobic chains, which reinforce the ion pair and lead to the formation of vesicles in pure formamide. Moreover, the study on the norbornene methyleneammonium tetradecanoate showed the importance of hydrophobic headgroup-headgroup interactions, an additional parameter which can favor vesicle formation in pure formamide
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Ormbostad, Ingunn. « Relationships Between Persistent Organic Pollutants (POPs) and Plasma Clinical-Chemical Parameters in Polar Bears (Ursus maritimus) from Svalbard, Norway ». Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16823.

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In the present study, clinical-chemical parameters in relationship to persistent organic pollutants (POPs) were investigated in plasma samples from polar bears (Ursus maritimus) captured at Svalbard in 2007. The clinical-chemical parameters examined were: hematocrit (HCT), hemoglobin (HB), aspartate aminotransferase (ASAT), alanine aminotransferase (ALAT), γ-glutamyltransferase (GGT), creatine kinase (CK), triglycerides (TG), cholesterol (CHOL), high-density lipoprotein (HDLP), creatinine (CREA), urea, and potassium (K). Altered homeostasis of clinical-chemical parameters in plasma may indicate impact on liver, kidney, heart, muscle, bone, metabolism or the endocrine system. Of the twelve clinical-chemical parameters examined in this study, significant association to POPs were found in seven parameters in female polar bears, whereas eight parameters were found in male polar bears. The results indicate that different POPs may exhibit toxic effect to different organs of polar bears. Liver toxicity was indicated by a decrease of hematologic parameters (HCT and HB), a decrease of liver enzymes (ASAT and GGT), and an elevation of metabolites (TG, CHOL, and HDLP) in relation to contaminant concentrations. Further, kidney toxicity was indicated by a decrease of CREA concentrations in relation to contaminant-concentrations, and muscle toxicity by a decrease in CK concentrations in relation to contaminant-concentrations. Continuous exposure to contaminants may therefore result in decreased renal, hepatic, and muscular functions. It is possible that these POP-associated effects may reduce the fitness and survival of polar bears. The results also indicate that clinical-chemical parameters in plasma can be applied as a non-invasive biomarker for toxicity to organs and metabolic homeostasis caused by exposure to POPs in polar bear. Because of the fast response to environmental factors, including POPs, these biomarkers can be used to measure an effect at an early stage, as well as at low exposure concentrations. However, the present study was not designed to evaluate the relationship between cause and effect, and it is important to take into consideration other factors that can affect clinical-chemical parameters when interpreting the results.
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Chase, Adam Thomas. « Flight Testing Small UAVs for Aerodynamic Parameter Estimation ». DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1191.

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A flight data acquisition system was developed to aid unmanned vehicle designers in verifying the vehicle's design performance. The system is reconfigurable and allows the designer to choose the correct combination of complexity, risk, and cost for a given flight test. The designer can also reconfigure the system to meet packaging and integration requirements. System functionality, repeatbility, and accuracy was validated by collecting data during multiple flights of a radio-controlled aircraft. Future work includes sensor fusion, thrust prediction methods, stability and control derivative estimation, and growing Cal Poly's small-scale component aerodynamic database.
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Fendri, Ahmed. « Impedimetric Sensor System for Edible Oil Quality Assessment ». Universitätsverlag Chemnitz, 2019. https://monarch.qucosa.de/id/qucosa%3A37173.

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The repeated usage of frying oil is hazardous due to the degradation caused by chemical reactions, which happen while heating. The total polar compounds and the free fatty acids are the main two chemical parameters affected by frying. These parameters increase significantly with the use of oil for frying and are reported as reasons for causing serious illnesses like heart diseases. For this purpose, sensor systems for oil quality assessment are necessary. In fact, changes of the composition due to frying leads to variation of its dielectric parameters. This can be measured using a capacitive sensor and the measurement of its impedance change. The main challenge thereby is that the impedance changes are very small and stray capacitances have a big influence on the measurements. In this context, this work proposes a sensor system with high accuracy able to detect the small changes that occur in the resistance and capacitance under influence of stry capacitances. Theoretical and simulation studies are carried out for different cap acitive sensors as well as meas urement procedures of its cornp lex imp edance. The sensor should provide a high sensitivity to relative perrnittivity and the electrical conductiv ity, and at the same time a small size and a high reproducibility. Interdigital electrodes sensor with a suitable design fulfils all these requirements. A deep consideration of stray capacitances is needed to realize an accurate sensor system. For t hese reasons, the design of the measurement circuit is crucial within this work. We propose, a measurernent circuit based on a combinat ion of the method of capacitance to voltage conversion and the phase shift measurement method. By cornbining both rnethods together it is possible to rneasure accurate ly the complex irnpedance of edible oil. Experimental results show that measurement systern is capable to detect small changes of dielectric parameters, which are correlated to the chemical parameters.
Die mehrfach wiederholte Verwendung von Frittieröl ist aufgrund der Qualitätsver­ schlechterung, die während des Erhitzens auftreten durch chemische Reaktionen verursacht wird, gefährlich für die Gesundheit. Die totale polaren Kompon enten und die freien Fettsäuren sind die zwei wichtigsten chemischen Komponenten, die wesentlich durch das Braten beeinflusst werden. Diese Komponenten erhöhen sich signifikant mit der Wiederverwendung von Bratöl und verursachen u. a. ernste Herzkrankheiten. Diese Arbeit zielt darauf hin, ein mobiles, kostengünstiges, einfach zu verwenden­ des Sensorsystem für die Abschätzung der Ölqualität zu entwickeln. Das System charakterisiert die Veränderung der elektrischen Parameter des Öls durch Messung der Änderung seiner komplexen elektrischen Eigenschaft en. In dieser Arbeit wurde ein Sensorelement mit interdigitalen Elektroden entwickelt, der eine hohe Empfindlichkeit auf die relative Permittivität und die elektrischen Leitfähigkeit des Öls hat und dabei einer hohe Reproduzierbarkeit erzielen kann. Es wird ein Messverfahren vorgeschlagen, das auf der Wandlung in einer Spannung und einer Phasenverschiebung basiert. Sowohl durch theoretische Überlegungen als auch durch Simulationen konnte belegt werden, dass die Kombination beider Metho­ den eine akkurate Messung der Komplexem Imped anz hochdielektrischer Materia lien ermöglichen kann. Experiment elle Ergebnisse zeige n, dass das Messsystem in der Lage ist , kleine Änderungen der dielektrischen Parameter zu erfassen, die mit den chemischen Ölparamtern stark korrelieren.
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McGaughran, Angela. « Polar eveolution : molecular genetic and physiological parameters of Antarctic arthropod populations : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Molecular Biosciences at the Allan Wilson Centre of Molecular Ecology and Evolution, Institute of Molecular Biosciences, Massey University, Palmerston North, New Zealand ». Massey University, 2009. http://hdl.handle.net/10179/1163.

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This thesis is presented as a collection of research papers synthesising knowledge gained during the period of candidacy. Its underlying focus is the examination of evolution from a variety of perspectives for terrestrial arthropods (springtails) in an Antarctic setting. These perspectives include investigation of the ways in which springtail populations respond both physiologically and genetically to environmental variability over historical and contemporary time-scales. While the physiological and genetic may seem two worlds apart, this thesis recognises that, in reality the two are inextricably linked. Thus, when genetic differentiation between populations of the same species can be demonstrated, physiological differentiation of these populations may also be predicted (and vice versa). Therefore, across several locations and springtail species, physiological and genetic parameters of individuals and populations are examined both separately and, where possible, in concert. The physiological aspect of this thesis focuses on the springtail Gomphiocephalus hodgsoni from continental Antarctica. In addition to providing the first metabolic rate data for a continental Antarctic springtail, seasonal variation in metabolic rates is examined across multiple temporal and spatial scales to evaluate the ways in which individuals and populations respond to environmental variability. Metabolic activity in this species is intricately linked to a variety of factors, both intrinsic and extrinsic. These include biological function, temperature profiles in the local microclimate, and body mass and genetic differences among populations. In the genetically-focused aspect of this thesis, population genetic patterns of G. hodgsoni from several continental locations and Cryptopygus antarcticus antarcticus from locations across the Antarctica Peninsula are compared. Here, the importance of differing evolutionary histories in influencing patterns of contemporary genetic population structure is highlighted. While both species have been similarly affected genetically by Pleistocene (2 Ma – present) glacial cycling, it is clear that differences in timing of colonisation events and subsequent population expansions have left distinct genetic signatures in each species. In a separate molecular study, phylogenetic analyses are employed to study members of the circum-Antarctic springtail family Isotomidae. Thesis Abstract The genetic ancestry among these closely related species is shown to reflect a diverse evolutionary origin in the Miocene (23 – 5 Ma), subsequent to which both vicariant and dispersal processes have been important. Phylogenetic re-constructions tease out the relationships among sister species, and the identification of several genetically distant lineages suggests that a revision of current species designations is required. Finally, two studies that integrate the physiological and molecular genetic are presented. First, metabolic rate variation across several locations on sub-Antarctic Marion Island in the springtail Cryptopygus antarcticus travei is examined. This variation is related to the genetic structure of populations to show that historical and contemporary environmental characteristics have left their trace in the expression of both genetic and physiological variability of these populations. Second, the perceived association between metabolic rate and genetic (mutation) rate is investigated more closely - a sophisticated Bayesian correlation analysis detects that there is an indirect relationship between metabolic rate and underlying species phylogeny in C. a. travei. Thus, the physiological and molecular genetic elements of this thesis test or advance important hypotheses within their own fields, and the integrated approach applied is a new step in interpreting evidence of physiological adaptation in Antarctic species. In its multi-faceted approach to evolutionary studies, this thesis enhances understanding of the current picture of springtail evolution in polar environments.
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Molčan, Vladimír. « Určení prostorových vztahů jeřábové dráhy ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-227104.

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The main theme of this master thesis is the design of technological process measurement and processing of measured data entered crane tracks to determine the geometric parameters of these crane tracks. Diploma thesis further describes the procedure for testing and possible rectification surveying equipment and instrumentation. The thesis is divided of 7 parts, contains 31 images, 4 graphs, 44 tables and 13 attachments. The theoretical part of this thesis contains information about several types of cranes, methods of measurement and processing, as well information on legal and technical regulations related to this topic of the thesis. The fourth and fifth parts of this thesis provides information on selected crane tracks on which the measurements were taken, the choice of methods of measurement, processing technique and the results obtained. The final part of the thesis includes evaluation of the results obtained, comparing methods of measurement, processing, evaluation and design of a technique of determining the geometric parameters of crane tracks.
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Bernardi, Camila Motta Marin. « Desempenho de progênies e clones de Eucalyptus grandis hill ex. Maiden em sistema silvipastoril ». Ilha Solteira, 2018. http://hdl.handle.net/11449/154363.

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Orientador: Miguel Luiz Menezes Freitas
Resumo: Neste estudo objetivou-se estimar parâmetros genéticos e estatísticos para caracteres quantitativos nos primeiros seis anos de crescimento de progênies de Eucalyptus grandis em sistema silvipastoril; comparar a produtividade, estabilidade e adaptabilidade das progênies em diferentes idades e mensurar a produção de forragem e as características morfológicas e bromatológicas do capim Urochloa decumbens cv. Basilisk em crescimento livre no sub-bosque das árvores. Foram mensurados a altura (ALT), diâmetro a altura do peito (DAP) e sobrevivência (SOB), aos 2, 3, 4, 5, e 6 anos após o plantio. O delineamento utilizado foi o de blocos casualizados desbalanceados com 150 tratamentos (147 progênies de Eucalyptus grandis e três clones comerciais: C041H, P4295H e H15), 26 repetições e uma planta por parcela, no espaçamento de 2,0 x 2,5 x 4,0 m. Para avaliação do capim foram coletadas amostras da área abaixo e entre as linhas duplas de E. grandis. Na análise individual, os clones comerciais tiveram praticamente 100% de seus indivíduos entre os primeiros 250 classificados, as progênies 25 e 162 apresentaram número significativo de indivíduos nesta classificação. Em relação a classificação dos genitores, ao longo dos anos, os clones C041H e H15 sempre ficaram entre as primeiras posições. Mas as progênies 25 e 162 superaram o clone P4295H nos caracteres ALT, DAP e VOL, com correlação alta e positiva entre os anos para ALT e DAP (>0,74). Houve diferença significativa entre os tratamentos no ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of this study was to estimate genetic and statistical parameters for quantitative traits in the first six years of growth of Eucalyptus grandis progenies in the silvipastoril system; to compare productivity, stability and adaptability of progenies at different ages and to measure forage production and morphological and bromatological characteristics of Urochloa decumbens cv. Basilisk in free growth in the understorey of the trees. Height (ALT), diameter at breast height (DAP) and survival (SOB) were measured at 2, 3, 4, 5, and 6 years after planting. The experimental design was a randomized block with 150 treatments (147 progenies of Eucalyptus grandis and three commercial clones: C041H , P4295H and H15), 26 replicates and one plant per plot, at a spacing of 2.0 x 2.5 x 4 , 0 m. For evaluation of the grass samples were collected from the area below and between the double lines of E. grandis. In the individual analysis, commercial clones had practically 100% of their individuals among the first 250 classified, progenies 25 and 162 presented a significant number of individuals in this classification. Regarding the classification of the parents, over the years, the clones C041H and H15 always were among the first positions. But progenies 25 and 162 outperformed clone P4295H in ALT, DAP and VOL, with high and positive correlation between the years for ALT and DAP (> 0.74). There was a significant difference between the treatments during the evaluation years for the ... (Complete abstract click electronic access below)
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Zaruma, Darlin Ulises Gonzalez. « Pomar de sementes por mudas em Eucalyptus camaldulensis e Hymenaea stigonocarpa : uma opção para o melhoramento e a conservação genética em espécies arbóreas exóticas e nativas / ». Botucatu, 2020. http://hdl.handle.net/11449/192613.

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Orientador: Mario Luiz Teixeira de Moraes
Resumo: As espécies florestais possuem grande importância econômica, pois oferecem diversos produtos fundamentais para a sociedade, mas dada a impossibilidade de se separar ações de melhoramento das de conservação de recursos genéticos, técnicas como os testes combinados de progênies e procedências, tanto para espécies exóticas ou nativas, visam a seleção de árvores pelo valor genético e a transformação dos experimentos em PSM (pomares de semente por mudas). Os pomares de sementes são os vetores de produção de sementes de alta qualidade genética, que ligam as atividades de melhoramento das árvores às práticas de conservação. No anterior contexto, sementes de polinização aberta provenientes de uma população base de Eucalyptus camaldulensis e de um fragmento de Cerrado com Hymenaea stigonocarpa, foram coletadas e plantadas na Faculdade de Engenharia de Ilha Solteira (FEIS/UNESP), em Selvíria-MS. O objetivo deste trabalho foi verificar a variação genética e ganhos genéticos a partir do desbaste dentro de progênies de E. camaldulensis aos 10 anos de idade e estimar parâmetros genéticos populacionais, por meio de marcadores moleculares do tipo microssatélites para H. stigonocarpa, com vistas ao melhoramento genético e conservação, respectivamente. Para análise quantitativa, os caracteres altura (ALT), diâmetro a altura do peito (DAP), volume (VOL), densidade básica (DBM) e sobrevivência (SOB) foram utilizados. Assim os valores observados para sobrevivência (>90%) de E. camaldulensis indic... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Forest species are of great economic importance, as they offer several fundamental products for society, but given the impossibility of separating actions to improve those from the conservation of genetic resources, techniques such as the combined testing of progenies and provenances for both exotic and native species, aim at the selection of trees by their genetic value and the transformation of the experiments in PSM (seed orchards by seedlings). Seed orchards are the vectors of seed production of high genetic quality, which link tree improvement activities to conservation practices. In the previous context, open pollination seeds from a base population of Eucalyptus camaldulensis and a fragment of Cerrado with Hymenaea stigonocarpa, were collected and planted at the Faculty of Engineering of Ilha Solteira (FEIS/UNESP), in Selvíria-MS. The objective of this work was to evaluate the genetic variation and genetic gains from thinning within E. camaldulensis progeny at 10 years of age, and to estimate population genetic parameters, using microsatellite molecular markers for H. stigonocarpa, with a view to genetic improvement and conservation, respectively. For quantitative analysis, the characters height (H), diameter at breast height (DBH), volume (VOL), basic density (DBM) and survival (SUR) were used, thus the values observed for survival (> 90%) indicate good adaptation of the species to the place. Estimates considered to be of high magnitude were obtained for the coefficie... (Complete abstract click electronic access below)
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Mirjana, Topić. « Fiziološki aspekti otpornosti hrasta lužnjaka (Quercus robur L.), cera (Quercus cerris L.) i crne topole (Populus nigra L.) u uslovima vodnog deficita ». Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=95391&source=NDLTD&language=en.

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    U radu je ispitan uticaj vodnog deficita na fiziološke osobine klonova crne topole ipopulacija hrasta lužnjaka i cera, kao i mogućnost oporavka ovih biljaka nakon ponovnog uspostavljanja optimalnog vodnog režima. Cilj istraživanja je bio da se ukaže na potencijal ispitivanih genotipova topole i hrastova za opstanak u  promenljivim uslovima životne sredine, u skladu sa aktuelnim klimatskim promenama koje uključuju smanjenje količine padavina i ograničenu dostupnost vode. Dobijeni rezultati su pokazali specifično variranje ispitivanih morfo-anatomskih, fizioloških i biohemijskih parametara koje je zavisilo od momentalne vlažnosti zemljišta na primenjenom tretmanu (kontrola, suša praćena oporavkom, konstantna suša) i od genotipa biljke.    Negativan uticaj vodnog  deficita na tretmanu konstantne suše je u najmanjoj meri bio ispoljen na rastenje klona topole X/32, populaciju hrasta lužnjaka L1 i populaciju hrasta cera C1. Indeks tolerancije na stres izračunat na osnovu visine biljke (PHSI) takodje je potvrdio dobru morfološku prilagodjenost pomenutih genotipovana uslove suše. Dobijene vrednosti indeksa stoma ukazuju da vodni status ispitivanih populacija hrastova nije bio naroĉito pogodjen vodnim deficitom na sušnim tretmanima.    Tretman konstantne suše je u oba ogleda  doveo do najvećeg smanjenja vrednostiparametara razmene gasova kod skoro svih genotipova. S druge strane, primenjeni sušni tretmani nisu uslovili smanjenje sadržaja fotosintetiĉkih pigmenata, kao ni parametra Fv/Fm, kod većine ispitivanih biljaka. U odnosu na kontrolu, sadržaj prolina u listovima ispitivanih biljaka na tretmanu konstantne suše bio je    znaĉajno povećan, a aktivnost enzima nitrat-reduktaze značajno smanjena, kod većine genotipova.    Genotipovi kod kojih u uslovima jakog vodnog deficita nije došlo do značajne promene većine ispitivanih morfo-anatomskih, fizioloških i biohemijskih parametara mogu biti od velike važnosti kad je u pitanju njihov odabir i upotreba za uspešno pošumljavanje sušnih staništa, kojih će biti sve više usled negativnog uticaja brojnih ekoloških činilaca nastalih kao posledica klimatskih promena.
The impact of water deficit and recovery on physiological features of the black poplar clones, as well as of the oaks populations were analyzed. The aim of this research was to indicate the potential of the studied genotypes for survival under changing environmental conditions, in accordance with current climate changes, which include the reduction in amount of rainfall and limited water availability. Obtained results have shown a specific variation of studied morpho-anatomical, physiological and biochemical parameters which depended on soil humidity on the applied treatment (control, drought followed by recovery and permanent drought), as well as on plant genotype.Water deficit on permanent drought treatment had little negative effect on plant growth of poplar clone X/32, as well as oak populations L1 and C1. Plant height stress tolerance index also confirmed good morphological adaptation to drought of these genotypes. Stomatal index was not negatively affected by water deficit in oak plants.     In both experiments, a permanent drought treatment led to the largest reduction in the values of gas exchange parameters in almost all genotypes.On the other hand, concentration of  photosynthetic pigments was not considerably decreased in plants exposed to water deficit, as well as the parameter Fv/Fm, in most examined plants. Compared to the control, the impact of permanent drought treatment  on biochemical parameters was expected, in the most cases.     Compared to the control, proline content in leaves of most examined genotypes was significantly increased on permanent drought treatment, while nitrate reductase activity was significantly decreased.Examined genotypes exhibiting slight or no reduction in values of the most  examined parameters during severe  drought stress, could be used for afforestation in arid sites. Arid habitats appeared to be more numerous due to the effects of global climate changes.
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Livres sur le sujet "Polar parameters"

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Santimay, Basu, et U.S. Air Force Geophysics Laboratory. Ionospheric Physics Division, dir. 250 MHz/GHz scintillation parameters in the equatorial, polar and auroral environments. Hanscom AFB, MA : Ionospheric Physics Division, Air Force Geophysics Laboratory, 1986.

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L, Horwitz James, Moore T. E et United States. National Aeronautics and Space Administration., dir. DE-1 observations of polar 0+ stream bulk parameters and comparison with a model of the centrifugally-accelerated polar wind. [Washington, DC : National Aeronautics and Space Administration, 1995.

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L, Horwitz James, Moore T. E et United States. National Aeronautics and Space Administration., dir. DE-1 observations of polar 0+ stream bulk parameters and comparison with a model of the centrifugally-accelerated polar wind. [Washington, DC : National Aeronautics and Space Administration, 1995.

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Ninul, Anatolij Sergeevič. Tenzornaja trigonometrija : Teorija i prilozenija / Theory and Applications /. Moscow, Russia : Mir Publisher, 2004.

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Ninul, Anatolij Sergeevič. Tensor Trigonometry. Moscow, Russia : Fizmatlit Publisher, 2021.

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DE-1 observations of polar 0+ stream bulk parameters and comparison with a model of the centrifugally-accelerated polar wind. [Washington, DC : National Aeronautics and Space Administration, 1995.

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National Aeronautics and Space Administration (NASA) Staff. De-1 Observations of Polar o(+) Stream Bulk Parameters and Comparison with a Model of the Centrifugally-Accelerated Polar Wind. Independently Published, 2018.

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Chapitres de livres sur le sujet "Polar parameters"

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Comiso, Josefino. « Geophysical Parameters and Algorithms for High Latitude Applications ». Dans Polar Oceans from Space, 113–80. New York, NY : Springer New York, 2010. http://dx.doi.org/10.1007/978-0-387-68300-3_4.

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Foster, J. C., J. M. Holt, J. D. Kelly et V. B. Wickwar. « High-Resolution Observations of Electric Fields and F-Region Plasma Parameters in the Cleft Ionosphere ». Dans The Polar Cusp, 349–64. Dordrecht : Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5295-9_25.

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Wilson, Clark R., et R. O. Vicente. « Maximum likelihood estimates of polar motion parameters ». Dans Variations in Earth Rotation, 151–55. Washington, D. C. : American Geophysical Union, 1990. http://dx.doi.org/10.1029/gm059p0151.

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Chen, Lue, Geshi Tang, Songjie Hu, Ming Chen, Yifei Li, Mei Wang, Jing Sun, Ming Shi et Li Li. « Earth Polar Motion Parameters High Accuracy Differential Prediction ». Dans Lecture Notes in Electrical Engineering, 71–79. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44687-4_7.

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Daniilidis, Konstantinos. « Computation of 3D-motion parameters using the log-polar transform ». Dans Computer Analysis of Images and Patterns, 82–89. Berlin, Heidelberg : Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/3-540-60268-2_283.

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Li, S., Z. Cheng et W. F. Weeks. « Extraction of Intermediate Scale Sea Ice Deformation Parameters from SAR Ice Motion Products ». Dans Analysis of SAR Data of the Polar Oceans, 69–90. Berlin, Heidelberg : Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-60282-5_4.

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Pednekar, S. M. « Spatio and Temporal Variability of Physical Parameters in the Prydz Bay for Climate Change ». Dans Polar Ice and Global Warming in Cryosphere Regions, 208–24. New York : CRC Press, 2024. http://dx.doi.org/10.1201/9781003364115-10.

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Kirschner, S., et F. Seitz. « Recursive Adjustment Approach for the Estimation of Physical Earth Parameters from Polar Motion ». Dans International Association of Geodesy Symposia, 453–59. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37222-3_60.

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Faccioli, Pietro, et Carlos Lourenço. « Meaning and Interpretation of the Frame-Independent Polarization ». Dans Particle Polarization in High Energy Physics, 121–46. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08876-6_4.

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AbstractThis chapter discusses the importance of the invariant polarization observable $$\mathcal{F}$$ (or $$\tilde{\lambda}$$) in certain physics scenarios, where none of the adoptable polarization frames would provide a particularly simple picture in terms of $$\lambda_\vartheta$$, $$\lambda_\varphi$$ and $$\lambda_{\vartheta\varphi}$$. One such case is the production of Drell--Yan dileptons, where the polarization parameters, calculated including perturbative QCD corrections, satisfy the Lam--Tung identity, a frame-independent relation maintaining its seemingly surprising simplicity even when the polar and azimuthal anisotropies have strong dependences on the particle momentum. The notion of invariant polarization allows us to reinterpret this relation in a geometrical way, explaining it as a mere consequence of helicity conservation and rotational invariance.
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Zhang, Shuang, Lu Wang, Xiangchuan Yu et Bo Chen. « A Terrain Classification Method for POLSAR Images Based on Modified Scattering Parameters ». Dans E-Learning and Games, 149–53. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23712-7_21.

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Actes de conférences sur le sujet "Polar parameters"

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Gupta, Aman, et Swaminathan R. « Blind Estimation of Polar Encoder Parameters ». Dans 2023 IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS). IEEE, 2023. http://dx.doi.org/10.1109/ants59832.2023.10468860.

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Xiong, Jiahui, et Lijun Zhang. « Simplified Calculation of Bhattacharyya Parameters in Polar Codes ». Dans 2020 IEEE 14th International Conference on Anti-counterfeiting, Security, and Identification (ASID). IEEE, 2020. http://dx.doi.org/10.1109/asid50160.2020.9271700.

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Ma, Xuan, Meng Zhu, Lixin Li, Xiaocong Wen, Jiaying Yin et Jing Li. « Equivalent Channel Parameters for Polar Coded Cooperative Relaying ». Dans 4th International Conference on Information Systems and Computing Technology. Paris, France : Atlantis Press, 2016. http://dx.doi.org/10.2991/isct-16.2016.14.

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Galabov, B., et T. Dudev. « Relationship Between Infrared Intensity Theories : Electro-Optical Parameters And Bond Polar Parameters ». Dans Intl Conf on Fourier and Computerized Infrared Spectroscopy, sous la direction de David G. Cameron. SPIE, 1989. http://dx.doi.org/10.1117/12.969596.

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Kiryanov, A. V. « Metrological Parameters Enhancement for Polar Coordinates Laser Pattern Generator ». Dans ACIT - Information and Communication Technology. Calgary,AB,Canada : ACTAPRESS, 2010. http://dx.doi.org/10.2316/p.2010.693-009.

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Lin, Rongrong, et Leon Thomsen. « Extracting polar anisotropy parameters from seismic data and well logs ». Dans SEG Technical Program Expanded Abstracts 2013. Society of Exploration Geophysicists, 2013. http://dx.doi.org/10.1190/segam2013-1150.1.

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Sherstyukov, Ruslan, Alexander Kozlovsky, Thomas Ulich et Samson Moges. « Deep learning for ionogram parameters scaling at polar region ionosphere ». Dans 2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2023. http://dx.doi.org/10.23919/ursigass57860.2023.10265632.

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Avdovic, Pajazit, Linhong Xu, Mats Andersson et Jan-Eric Sta˚hl. « Evaluating the Machinability of Inconel 718 Using Polar Diagrams ». Dans ASME Turbo Expo 2010 : Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22695.

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The use of a polar diagram method for describing and evaluating the machinability of Inconel 718 was explored. Five key parameters of the work material, representing the mechanical and physical properties which have strongest influence on its machinability, were employed in the diagrams. These five parameters were integrated into a single polar diagram, used to describe the machinability of Inconel 718. Variations in the machinability of Inconel 718 products or components of a given type produced in different batches were analyzed. Industrial experiments were conducted to test the relationship between the polar diagram of the work material, its carbon content, and tool wear of the ceramic cutting tools used in machining it. Work materials of Inconel 718 in which the polar diagrams of machinability were similar in size and shape exhibited very similar behavior during the cutting process. The polar diagram method employed appeared to be useful for selecting suitable cutting data for the machining of new materials.
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Suslikov, M. V., et A. I. Kolbin. « Determination of the parameters of polar V379 Vir components, magnetic field and accretion ». Dans Всероссийская с международным участием научная конференция студентов и молодых ученых, посвященная памяти Полины Евгеньевны Захаровой «Астрономия и исследование космического пространства». Ural University Press, 2021. http://dx.doi.org/10.15826/b978-5-7996-3229-8.15.

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In this work we performed a photometric and spectral study of the polar V379 Vir. We used the modeling of the IR light curves based on a simple model of cyclotrone radiation source, the method of synthetic photometry to fit the observed spectral distribution of the energy, as well as the modeling of the magnetic curve obtained from Zeeman splitting of the Hβ line to determine the parameters of the system. We managed to estimate the temperature of the white dwarf Teff = 11 450 K, the masses and radii of the primary and secondary components: M1 = 0.696 M , R1 = 0.011 R , M2 = 0.105 M , R2 = 0.14 R . The separation of the components was about 0.6 AU, and the inclination i lies in the range 47—60◦.
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Dapeng, Gao, Guo Zhidong, Wang Tianjiao, Liu Yuewu et Hou Shaoji. « VARIATION OF PARAMETERS METHOD FOR MICRO-POLAR FLUID THROUGH A CBM POROUS MEDIA ». Dans International Conference on New Materials and Intelligent Manufacturing (ICNMIM). Volkson Press, 2018. http://dx.doi.org/10.26480/icnmim.01.2018.466.468.

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Rapports d'organisations sur le sujet "Polar parameters"

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MacKenzie, Eileen, Sunanda Basu et Paul Pruneau. Scintillation and In-situ Irregularity Parameters in the Auroral Oval and Polar Cap. Fort Belvoir, VA : Defense Technical Information Center, décembre 1990. http://dx.doi.org/10.21236/ada282459.

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BARKHATOV, NIKOLAY, et SERGEY REVUNOV. A software-computational neural network tool for predicting the electromagnetic state of the polar magnetosphere, taking into account the process that simulates its slow loading by the kinetic energy of the solar wind. SIB-Expertise, décembre 2021. http://dx.doi.org/10.12731/er0519.07122021.

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The auroral activity indices AU, AL, AE, introduced into geophysics at the beginning of the space era, although they have certain drawbacks, are still widely used to monitor geomagnetic activity at high latitudes. The AU index reflects the intensity of the eastern electric jet, while the AL index is determined by the intensity of the western electric jet. There are many regression relationships linking the indices of magnetic activity with a wide range of phenomena observed in the Earth's magnetosphere and atmosphere. These relationships determine the importance of monitoring and predicting geomagnetic activity for research in various areas of solar-terrestrial physics. The most dramatic phenomena in the magnetosphere and high-latitude ionosphere occur during periods of magnetospheric substorms, a sensitive indicator of which is the time variation and value of the AL index. Currently, AL index forecasting is carried out by various methods using both dynamic systems and artificial intelligence. Forecasting is based on the close relationship between the state of the magnetosphere and the parameters of the solar wind and the interplanetary magnetic field (IMF). This application proposes an algorithm for describing the process of substorm formation using an instrument in the form of an Elman-type ANN by reconstructing the AL index using the dynamics of the new integral parameter we introduced. The use of an integral parameter at the input of the ANN makes it possible to simulate the structure and intellectual properties of the biological nervous system, since in this way an additional realization of the memory of the prehistory of the modeled process is provided.
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