Thematische Bibliographien / Analysis of directionality

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Auswahl der wissenschaftlichen Literatur zum Thema „Analysis of directionality“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 17. Februar 2022

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Zeitschriftenartikel zum Thema "Analysis of directionality"

Fife, J. L., J. C. Li, D. C. Dunand und P. W. Voorhees. „Morphological analysis of pores in directionally freeze-cast titanium foams“. Journal of Materials Research 24, Nr. 1 (Januar 2009): 117–24. http://dx.doi.org/10.1557/jmr.2009.0023.

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Synchrotron x-ray tomography was performed on titanium foams with aligned, elongated pores, initially created by sintering directionally freeze-cast preforms using two different powder sizes. Three-dimensional reconstructions of the pore structures were analyzed morphologically using interface shape and interface normal distributions. A smaller powder size leads to more completely sintered titanium walls separating the dendritic pores, which in turn created a more compact distribution of pore shapes as well as stronger pore directionality parallel to the ice growth direction. The distribution of pore shapes is comparable to trabecular bone reported in the literature, indicating the foam's potential as a bone replacement material.

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Perelberg, Azik I., und Scott C. Hornbostel. „Applications of seismic polarization analysis“. GEOPHYSICS 59, Nr. 1 (Januar 1994): 119–30. http://dx.doi.org/10.1190/1.1443522.

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Multicomponent seismic recording contains a wealth of information. A major challenge is to distill this information into something manageable. Polarization analysis is a technique for simplifying the situation by extracting two simple measures: ellipticity and directionality. These measures can be obtained quickly from the data covariance matrices and are sufficient for data analysis or for the design of weighting functions for seismic wave‐type selection. Data analysis using these measures may include the study of ellipticity to discern anisotropy and the use of ellipticity and directionality for a quick survey of the various wave types in the data. Applications of the related weighting functions include the removal of ground roll, the separation of converted waves or refractions, and the removal of out‐of‐plane arrivals.

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Tulsky, D., J. Zhu und E. L. Rolfhus. „WAIS-III scale discrepancy analysis and hypothesized directionality“. Archives of Clinical Neuropsychology 14, Nr. 8 (01.11.1999): 723–24. http://dx.doi.org/10.1093/arclin/14.8.723a.

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Meszaros, Megan, Desneige Meyer, Lindsey Vold und Wanda Martin. „Plotting Directionality on Positional Maps: A Methodological Consideration for Situational Analysis“. International Journal of Qualitative Methods 18 (01.01.2019): 160940691985528. http://dx.doi.org/10.1177/1609406919855280.

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In this article, we aim to expand situational analysis (SA), oriented by complex adaptive systems (CAS), by adding the dimension of directionality over time to positional maps. This addition furthers the analytic utility of SA and can aid researchers in identifying areas for transformative action regarding social justice and health equity issues. Adding directionality over time to positional maps pushes researchers to explore how positions move, evolve, and how they could continue to develop. Analyzing these elements expands the analytic utility of positional maps as researchers abductively analyze explicit connections between theorized antecedents, current conditions, and potential futures within a CAS to understand positional movements. The purpose of this analysis is not as a predictive tool but as a tool in identifying potential actionable areas for interventions while further grounding SA in its Foucauldian and Straussian theoretical roots. We use an ongoing public health project in the Ngorongoro Conservation Area, Tanzania, to demonstrate how a researcher can apply directionality over time to positional maps.

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Company Company, Concepción. „Four directionalities for grammaticalization“. Journal of Historical Linguistics 8, Nr. 3 (31.12.2018): 356–87. http://dx.doi.org/10.1075/jhl.17032.com.

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Abstract This article offers an analysis and systematization of the relationship between directionality and grammaticalization and develops an innovative proposal regarding a new type of directionality. The article proposes four types of directionality in grammaticalization: A. down, B. up, C. neither down nor up, and D. up and down. The first three types are very well studied, but the last has been overlooked in the theoretical literature. The article analyzes directionality D in depth. It is a directionality that is very similar to a round trip: an up in the cline is followed by a down in the cline. First, the form or construction leaves sentence grammar and enters into periphery grammar, acquiring a new category and a discourse meaning, generally a subjective one; later, the form comes back into sentence grammar, but always re-enters as a different category from the etymological source. This process appears to be round trip directionality. This round trip process constitutes a fourth type of directionality in grammaticalization. Directionality D requires its own status, distinct from the sum of directionalities A and B, due to its specific source and due to the fact that the reinsertion into the sentence grammar is in a specific category. It has its own individual distribution and a characteristic and innovative circular path. The evidence of this directionality presented in this article comes from Spanish, but this path very likely also generalizes to other languages.

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Grewal, Shiv I. S., und Amar J. S. Klar. „A Recombinationally Repressed Region Between mat2 and mat3 Loci Shares Homology to Centromeric Repeats and Regulates Directionality of Mating-Type Switching in Fission Yeast“. Genetics 146, Nr. 4 (01.08.1997): 1221–38. http://dx.doi.org/10.1093/genetics/146.4.1221.

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Cells of the fission yeast Schizosaccharomyces pombe switch mating type by replacing genetic information at the transcriptionally active mat1 locus with sequences copied from one of two closely linked silent loci, mat2-P or mat3-M. By a process referred to as directionality of switching, cells predominantly switch to the opposite mat1 allele; the mat1-P allele preferentially recombines with mat3, while mat1-M selects the mat2. In contrast to efficient recombination at mat1, recombination within the adjoining mat2-mat3 interval is undetectable. We defined the role of sequences between mat2 and mat3, designated the K-region, in directionality as well as recombinational suppression. Cloning and sequencing analysis revealed that a part of the K-region is homologous to repeat sequences present at centromeres, which also display transcriptional and recombinational suppression. Replacement of 7.5 kb of the K-region with the ura4 + gene affected directionality in a variegated manner. Analysis of the swi6-mod locus, which was previously shown to affect directionality, in KΔ::ura4 + strains suggested the existence of at least two overlapping directionality mechanisms. Our work furthers the model that directionality is regulated by cell-type-specific organization of the heterochromatin-like structure in the mating-type region and provides evidence that the K-region contributes to silencing of the mat2-mat3 interval.

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Pawlus, P., R. Reizer und M. Wieczorowski. „The analysis of directionality of honed cylinder liners surfaces“. Scanning 36, Nr. 1 (19.06.2013): 95–104. http://dx.doi.org/10.1002/sca.21101.

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Huang, Zhigang, und David V. Rosowsky. „Analysis of hurricane directionality effects using event-based simulation“. Wind and Structures 3, Nr. 3 (25.09.2000): 177–91. http://dx.doi.org/10.12989/was.2000.3.3.177.

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Waseda, Takuji, Takeshi Kinoshita und Hitoshi Tamura. „Evolution of a Random Directional Wave and Freak Wave Occurrence“. Journal of Physical Oceanography 39, Nr. 3 (01.03.2009): 621–39. http://dx.doi.org/10.1175/2008jpo4031.1.

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Abstract The evolution of a random directional wave in deep water was studied in a laboratory wave tank (50 m long, 10 m wide, 5 m deep) utilizing a directional wave generator. A number of experiments were conducted, changing the various spectral parameters (wave steepness 0.05 < ɛ < 0.11, with directional spreading up to 36° and frequency bandwidth 0.2 < δk/k < 0.6). The wave evolution was studied by an array of wave wires distributed down the tank. As the spectral parameters were altered, the wave height statistics change. Without any wave directionality, the occurrence of waves exceeding twice the significant wave height (the freak wave) increases as the frequency bandwidth narrows and steepness increases, due to quasi-resonant wave–wave interaction. However, the probability of an extreme wave rapidly reduces as the directional bandwidth broadens. The effective Benjamin–Feir index (BFIeff) is introduced, extending the BFI (the relative magnitude of nonlinearity and dispersion) to incorporate the effect of directionality, and successfully parameterizes the observed occurrence of freak waves in the tank. Analysis of the high-resolution hindcast wave field of the northwest Pacific reveals that such a directionally confined wind sea with high extreme wave probability is rare and corresponds mostly to a swell–wind sea mixed condition. Therefore, extreme wave occurrence in the sea as a result of quasi-resonant wave–wave interaction is a rare event that occurs only when the wind sea directionality is extremely narrow.

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Ascher, Marcia. „How Can Spin, Ply, and Knot Direction Contribute to Understanding the Quipu Code?“ Latin American Antiquity 16, Nr. 1 (März 2005): 99–111. http://dx.doi.org/10.2307/30042488.

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AbstractEssential to quipu analysis is identification of the logical structure of the quipu and the internal relationships of the data within that structure. The identification process relies on examining, in detail, the colors, placement, and spacing of the quipu cords, and the knot types and positions on the cords. Spin, ply, and knot directionality have recently become available for 59 otherwise well-described quipus. Here, I examine this additional information in the context of the logic of the quipus. Analysis shows that for these quipus, except for three in which the main cord differs from the other cords, spin and ply are uniform for all the cords on a quipu. For the large majority of the quipus (about 81 percent), knot directionality is also uniform throughout. The 19 percent for which knot directionality is mixed are presented and discussed individually. On them, knot directionality conforms to, and plays a role in, the overall logic of the quipu. It is clear that spin, ply, and knot directionality are not chosen by the quipu-maker on a cord-by-cord basis and they do not serve to distinguish between quantitative and non-quantitative data.

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Dissertationen zum Thema "Analysis of directionality"

Iyun, Oluwatope Ebenezer. „Plant-wide diagnosis : cause-and-effect analysis using process connectivity and directionality information“. Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9296.

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Production plants used in modern process industry must produce products that meet stringent environmental, quality and profitability constraints. In such integrated plants, non-linearity and strong process dynamic interactions among process units complicate root-cause diagnosis of plant-wide disturbances because disturbances may propagate to units at some distance away from the primary source of the upset. Similarly, implemented advanced process control strategies, backup and recovery systems, use of recycle streams and heat integration may hamper detection and diagnostic efforts. It is important to track down the root-cause of a plant-wide disturbance because once corrective action is taken at the source, secondary propagated effects can be quickly eliminated with minimum effort and reduced down time with the resultant positive impact on process efficiency, productivity and profitability. In order to diagnose the root-cause of disturbances that manifest plant-wide, it is crucial to incorporate and utilize knowledge about the overall process topology or interrelated physical structure of the plant, such as is contained in Piping and Instrumentation Diagrams (P&IDs). Traditionally, process control engineers have intuitively referred to the physical structure of the plant by visual inspection and manual tracing of fault propagation paths within the process structures, such as the process drawings on printed P&IDs, in order to make logical conclusions based on the results from data-driven analysis. This manual approach, however, is prone to various sources of errors and can quickly become complicated in real processes. The aim of this thesis, therefore, is to establish innovative techniques for the electronic capture and manipulation of process schematic information from large plants such as refineries in order to provide an automated means of diagnosing plant-wide performance problems. This report also describes the design and implementation of a computer application program that integrates: (i) process connectivity and directionality information from intelligent P&IDs (ii) results from data-driven cause-and-effect analysis of process measurements and (iii) process know-how to aid process control engineers and plant operators gain process insight. This work explored process intelligent P&IDs, created with AVEVA® P&ID, a Computer Aided Design (CAD) tool, and exported as an ISO 15926 compliant platform and vendor independent text-based XML description of the plant. The XML output was processed by a software tool developed in Microsoft® .NET environment in this research project to computationally generate connectivity matrix that shows plant items and their connections. The connectivity matrix produced can be exported to Excel® spreadsheet application as a basis for other application and has served as precursor to other research work. The final version of the developed software tool links statistical results of cause-and-effect analysis of process data with the connectivity matrix to simplify and gain insights into the cause and effect analysis using the connectivity information. Process knowhow and understanding is incorporated to generate logical conclusions. The thesis presents a case study in an atmospheric crude heating unit as an illustrative example to drive home key concepts and also describes an industrial case study involving refinery operations. In the industrial case study, in addition to confirming the root-cause candidate, the developed software tool was set the task to determine the physical sequence of fault propagation path within the plant. This was then compared with the hypothesis about disturbance propagation sequence generated by pure data-driven method. The results show a high degree of overlap which helps to validate statistical data-driven technique and easily identify any spurious results from the data-driven multivariable analysis. This significantly increase control engineers confidence in data-driven method being used for root-cause diagnosis. The thesis concludes with a discussion of the approach and presents ideas for further development of the methods.

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Martineau, Eugénie. „Linking single cell directionality to dynamic multicellular transitions in Myxococcus xanthus : a multiscale analysis“. Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0089.

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La δ-proteobactérie Myxococcus xanthus est étudiée depuis des décennies pour sa capacité à s’auto-organiser en réponse à des stimuli environnementaux. Cette bactérie colonise des niches écologiques favorables grâce à sa capacité à se mouvoir sur des surfaces. Cette motilité lui permet d’avoir un comportement prédateur envers des organismes proies, alors qu’en absence de nutriments, elle met en place un processus développemental permettant la formation de corps fructifères contenant des myxospores résistant aux stress environnementaux. Tous ces comportements multicellulaires requièrent un contrôle dynamique de la polarité de la cellule, établi par trois protéines polaires : MglA, MglB et RomR. Ensemble, elles définissent la direction de la cellule, qui peut être rapidement inversée sous l’action du système chimiotactique Frz (réversion). Dans ce travail de thèse, à travers une approche expérimentale et computationnelle, nous avons mis en évidence que le système de régulation forme un nouveau type d’oscillateur protéique, contrôlé par deux protéines RomR et FrzX, qui agissent ensemble et de manière complémentaire pour déclencher la réversion à l’arrière des cellules. L’architecture unique de ce système permet une réponse très large à différents stimuli, essentielle pour de nombreux comportements multicellulaires. Afin de comprendre l’importance de ces transitions, nous avons mis au point un outil à haute résolution spatiale et temporelle afin de connecter les cellules individuelles aux comportements multicellulaires, et ainsi comprendre le rôle du système Frz dans un modèle multicellulaire de prédation
The δ-proteobacteria Myxococcus xanthus has been a model of study for decades for its self-organized behavior as a response of environmental stimuli. It colonizes favorable ecological niches by using surface motility. In particular, this motility allows M.xanthus to predate collectively over prey microorganisms, while under starvation they start a developmental process to form macroscopic fruiting bodies, filled with environmental resistant myxospores. All these multicellular behaviors require a dynamic control of the cell polarity established by the polarity proteins MglA, MglB and RomR. Together, they define the direction of movement of the cell, which can be rapidly inverted by the Frz chemosensory system (reversion). In this thesis work, through combined computational/experimental approaches, we highlight that the regulation system forms a new type of biochemical oscillator, controlled by two proteins RomR and FrzX, which act together through complementary action to trigger the reversion at the lagging pole. The unique architecture of this system allows a wide response to various stimuli, which could be very beneficial for collective cell behaviors. To understand the importance of these transitions, we have developed a new high-resolution single cell assay linking single cMARTINEAU EUGENIE 2018AIXM0089/016ED62 2018/03/21 62 SCES SCHell behaviors to multicellular structures at unprecedented spatial and temporal resolutions. This way, we have investigated the role of the newly identified biochemical oscillator in the multicellular model of predation

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Parsa, Amanullah. „EFFECT OF BUILDING ORIENTATION ON STRUCTURAL RESPONSE OF REINFORCED CONCRETE MOMENT RESISTING FRAME STRUCTURES“. OpenSIUC, 2020. https://opensiuc.lib.siu.edu/theses/2698.

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In time history analysis of structures, the geometric mean of two orthogonal horizontal components of ground motion in the as-recorded direction of sensors, have been used as measure of ground motion intensity prior to the 2009 NEHRP provision. The 2009 NEHRP Provisions and accordingly the seismic design provisions of the ASCE/SEI 7-10, modified the definition of ground motion intensity measure from geometric mean to the maximum direction ground motion, corresponding to the direction that results in peak response of the oscillator. Maximum direction response spectra are assumed to envelope the range of maximum possible responses over all nonredundant rotation angles. Two assumptions are made in the use maximum ground motion as the intensity measure: (1) the structure’s strength and stiffness properties are identical in all directions and (2) azimuth of the maximum spectral acceleration coincides with the one of the principal axes of the structure. The implications of these assumptions are examined in this study, using 3D computer models of multi-story structures having symmetric and asymmetric layouts and elastic vibration period of 0.2 second and 1.0 second subjected to a set of 25 ground-motion pairs recorded at a distance of more than 20 km from the fault. The influence of the ground-motion rotation angle on structural response (here lateral displacement and story drift) is examined to form benchmarks for evaluating the use of the maximum direction (MD) ground motions. The results of this study suggest that while MD ground motions do not always result in largest structural response, they tend to produce larger response than the as-recorded ground motions. On the other hand, more research on non-linear seismic time history analysis is recommended, especially for asymmetric layout plan buildings.

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Henebry, Michael Lee. „Biological and Ecological Trait Associations and Analysis of Spatial and Intraspecific Variation in Fish Traits“. Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/33894.

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Traits provide an informative approach to examine species-environment interactions. Often, species-by-species approaches are inefficient to generate generalizable ecological relationships and do not predict species responses to environmental changes based on specific traits species possess. Multiple lines of inquiry and multi-scale approaches are best for assessing environment-trait responses. This thesis examines important questions not specifically addressed before in traits-based research. Chapter one explores biological and ecological trait associations incorporating ontogenetic diet shifts for New River fishes. Niche shift analysis as a chapter one sub-objective quantitatively support where species-specific diet shifts likely occur. Strong biological-ecological trait associations, some intuitive and others not so intuitive, were found that relate biological structure to ecological function. Improved understanding of trait associations, including what factors influence others, supports inference of ecology of fishes. Chapters two and three examine spatial and intraspecific trait variability. Chapter two specifically examines large-scale life history trait variability along latitudinal gradients for twelve widely distributed fish species, including directionality of trait variation, and hypothesizing how optimal traits change with large-scale environmental factors. Strong positive and negative patterns found include average total length of newly hatched larvae, average total length at maturation, average spawning temperature, average egg diameter, and maximum length. These five traits are correlated with other adaptive attributes (i.e. growth rate, reproductive output, and longevity/population turnover rate). In contrast to latitudinal scale, Chapter three examines trait variability of white sucker (Catostomus commersonii) and fantail darter (Etheostoma flabellare) as a function of small-watershed scale spatial factors and anthropogenic disturbance. Toms Creek and Chestnut Creek white sucker and fantail darter displayed positive response to disturbance, contrary to past studies. Lower resource competition, and / or competitive exclusion of fishes with similar niche requirements are possible mechanisms. All three objectives support understanding of trait association and variability as a useful foundation in ecological applications and for formulating plans for conservation and management of species.
Master of Science

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Appel, Jan Kristoffer [Verfasser]. „Particle Flux Directionality and other Aspects of the Martian Radiation Environment: An Analysis of MSL/RAD Observation Data and Simulation Data / Jan Kristoffer Appel“. Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1176518895/34.

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Plišková, Diana. „Analýza směrovosti neuritů“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442501.

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Práca je zameraná na navrhnutie vhodnej metódy analýzy smerovosti neuritov. Využité boli snímky neurónov z fluorescenčnej mikroskopie. Pred samotnou segmentáciou bolo potrebné snímky predspracovať, pričom sa postupne využila úprava kontrastu, ostrenie a adaptívna filtrácia pomocou Weinerovského filtru. Jednotlivé návrhy metód segmentácie pozostávali z prostého prahovania, narastaním oblastí a využitím morfologických operácií. Následná analýza smerovosti využívala smer gradientov v obraze. Navrhnutá metóda bola využitá aj ako klasifikátor, ktorý dokázal rozdeliť jednotlivé snímky do skupín podľa smeru rastu.

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Jeong, Sang Min. „Analysis of Vibration of 2-D Periodic Cellular Structures“. Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7122.

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The vibration of and wave propagation in periodic cellular structures are analyzed. Cellular structures exhibit a number of desirable multifunctional properties, which make them attractive in a variety of engineering applications. These include ultra-light structures, thermal and acoustic insulators, and impact amelioration systems, among others. Cellular structures with deterministic architecture can be considered as example of periodic structures. Periodic structures feature unique wave propagation characteristics, whereby elastic waves propagate only in specific frequency bands, known as "pass band", while they are attenuated in all other frequency bands, known as "stop bands". Such dynamic properties are here exploited to provide cellular structures with the capability of behaving as directional, pass-band mechanical filters, thus complementing their well documented multifunctional characteristics. This work presents a methodology for the analysis of the dynamic behavior of periodic cellular structures, which allows the evaluation of location and spectral width of propagation and attenuation regions. The filtering characteristics are tested and demonstrated for structures of various geometry and topology, including cylindrical grid-like structures, Kagom and eacute; and tetrhedral truss core lattices. Experimental investigations is done on a 2-D lattice manufactured out of aluminum. The complete wave field of the specimen at various frequencies is measured using a Scanning Laser Doppler Vibrometer (SLDV). Experimental results show good agreement with the methodology and computational tools developed in this work. The results demonstrate how wave propagation characteristics are defined by cell geometry and configuration. Numerical and experimental results show the potential of periodic cellular structures as mechanical filters and/or isolators of vibrations.

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Vecchi, Pierpaolo. „Defect analysis in directionally solidified multicrystalline silicon“. Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21177/.

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This project studies how the microstructure and metallic impurities affect the electrical properties of mc-Si wafers, to improve the efficiency and the production yield of photovoltaic solar cells. Dislocations and impurities in silicon are recombination centres that reduce free carrier lifetime and thus efficiency of solar cells. The quality of the material can be improved by finding optimal growth conditions and a threshold value for the contamination that does not compromise the device efficiency. Two sets of p-type mc-Si wafers located at different heights and lateral positions of two directionally solidified ingots, one contaminated with iron and one with aluminum, were analysed with several characterization techniques. The two ingots show similar microstructure, but the top of the iron contaminated ingot has a significantly lower lifetime, as it contains more dislocation clusters decorated with segregated iron. Aluminum is less detrimental at this low concentration level and it is more homogeneously distributed along the ingot height. A Mott-Schottky analysis after evaporation of aluminum contacts confirmed the p-type nature of the samples and estimated the free charge carrier concentration. Current profiles and local I-V curves measured with Conductive Atomic Force Microscopy show that decorated grain boundaries are a preferential path for electrical conduction compared to the grain regions and iron precipitates affect more heavily the electrical properties of the wafer compared to aluminum precipitates. The shape of the current profile at the boundary was justified with a theoretical model that assumes a redistribution of charge density due to a Coulombic potential introduced by a spherical and positively charged precipitate, that can be identified with b-FeSi2. The results from this characterization show that metallic contamination at grain boundaries in Si is responsible for enhanced free carrier recombination and thus efficiency reduction in mc-Si cells.

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Angart, Samuel Gilbert. „Microstructure Analysis Of Directionally Solidified Aluminum Alloy Aboard The International Space Station“. Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/595975.

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This thesis entails a detailed microstructure analysis of directionally solidified (DS) Al-7Si alloys processed in microgravity aboard the International Space Station and similar duplicate ground based experiments at Cleveland State University. In recent years, the European Space Agency (ESA) has conducted experiments on alloy solidification in microgravity. NASA and ESA have collaborated for three DS experiments with Al- 7 wt. % Si alloy, aboard the International Space Station (ISS) denoted as MICAST6, MICAST7 and MICAST12. The first two experiments were processed on the ISS in 2009 and 2010. MICAST12 was processed aboard the ISS in the spring of 2014; the resulting experimental results of MICAST12 are not discussed in this thesis. The primary goal of the thesis was to understand the effect of convection in primary dendrite arm spacings (PDAS) and radial macrosegregation within DS aluminum alloys. The MICAST experiments were processed with various solidification speeds and thermal gradients to produce alloy with differences in microstructure features. PDAS and radial macrosegregation were measured in the solidified ingot that developed during the transition from one solidification speed to another. To represent PDAS in DS alloy in the presence of no convection, the Hunt-Lu model was used to represent diffusion-controlled growth. By sectioning cross-sections throughout the entire length of solidified samples, PDAS was measured and calculated. The ground-based (1-g) experiments done at Cleveland State University CSU were also analyzed for comparison to the ISS experiments (0-g). During steady state in the microgravity environment, there was a reasonable agreement between the measured and calculated PDAS. In ground-based experiments, transverse sections exhibited obvious radial macrosegregation caused by thermosolutal convection resulting in a non-agreement with the Hunt- Lu model. Using a combination of image processing techniques and Electron Microprobe Analysis, the extent of radial macrosegregation was found to be a function of processing conditions and PDAS.

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McAllister, Mark Laing. „Analysis of laboratory and field measurements of directionally spread nonlinear ocean waves“. Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28762.

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Surface gravity waves exist in the oceans as multi-directional nonlinear phenomena. Understanding how these two properties interact is intrinsically important in itself. Furthermore, an understanding of this relationship may be used to gain insight into other oceanic phenomena. This thesis first describes an experimental investigation into the relationship between directionality and non-linearity (Part I). This relationship was then used as a tool to estimate the directional spreading of field data (Part II). Experiments have been conducted in which directionally spread focused wave groups were created in a wave tank. The relationship between the degree of directional spreading and the second-order bound harmonics of the wave groups was examined, in particular the formation of a `set-up'. These measurements were then compared to predictions from second-order theories, finding good agreement. The two-dimensional structure of the bound waves was explored giving new insight into the underlying physics. Experiments were then carried out for directionally spread crossing wave groups. It is believed that the crossing of two sufficiently separated wave groups may be the cause of an anomalous set-up in the second-order bound waves observed for some extreme and potentially freak waves. This set-up is reproduced experimentally. Again, the results of these test agreed very well when compared to second-order theory. The insight gained from the foregoing experiments was then utilised in the analysis of field data. A method, which requires only a single measurement to estimate the observed degree of directional spreading, was applied to a large dataset of field measurements from the North Alwyn platform in the North Sea. This method was then compared to conventional approaches, which require multiple concurrent measurements. The method that requires only a single measurement was shown to be effective, and presents a promising approach to gaining additional insight about the directional spreading of point observations.

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Bücher zum Thema "Analysis of directionality"

MacIsaac, Maitland. An analysis of circling directionality as a factor relating to academic achievement laterality, age, sex and point of commencement in students, grades K, 1, 2, 3. 1986.

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Sreeramesh, Kalluri, und United States. National Aeronautics and Space Administration., Hrsg. Estimation of the engineering elastic constants of a directionally solidified superalloy for finite element structural analysis. [Washington, D.C.?]: National Aeronautics and Space Administration, 1991.

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Buchteile zum Thema "Analysis of directionality"

Boye, Johan, Jukka Paakki und Jan Małuszyński. „Synthesis of directionality information for functional logic programs“. In Static Analysis, 165–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/3-540-57264-3_38.

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Wiedermann, Wolfgang, und Alexander von Eye. „Directionality of Effects in Causal Mediation Analysis“. In Statistics and Causality, 63–106. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118947074.ch4.

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Heuser, Svenja, Béatrice Arend und Patrick Sunnen. „Reading Aloud in Human-Computer Interaction: How Spatial Distribution of Digital Text Units at an Interactive Tabletop Contributes to the Participants’ Shared Understanding“. In Lecture Notes in Computer Science, 117–34. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60117-1_9.

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Abstract This paper is concerned with how the spatial distribution of written informings in a serious game activity at an interactive tabletop (ITT) induces participants to read aloud interactionally relevant information to each other in the process of co-constructing a shared understanding. Engaging in an unfamiliar game activity, the participants are all equally dependent on written informings from the interface that serve as a game manual and provide crucial information for jointly achieving the game task(s). When it comes to making use of these written informings, we find the participants to read them aloud, making them accountable within the group. Our findings from multimodal video analysis of two reading-aloud cases suggest that the written informing’s directionality and distribution (here, either designed as ‘distributed’ or ‘shared’ among the interface) regulate the participants’ access to information. And that participants who cannot visually access the information they are interested in reading (aloud) co-organize fine-grained joint successive actions build on and actualized by read-aloud utterances. These joint actions allow them to align their orientation and share their understanding of game activity-relevant content.

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Nam, Tran Tuan. „Analysis of Steel Columns Deteriorated Two-Directionally During Seismic Loading“. In Lecture Notes in Civil Engineering, 551–56. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0945-9_46.

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Kaneko, Yasutomo, Kazushi Mori und Hiroharu Ooyama. „Vibration Response Analysis of Mistuned Bladed Disk Consisting of Directionally Solidified Blade“. In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 101–11. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_9.

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Rodriguez, Carlos M., Adriana E. Candia, Carlos E. Schvezov, Mario R. Rosenberger und Alicia Ares. „Analysis of Thermal and Structural Parameters and Microhardess Variations in Different Al-Cu Alloys Directionally Solidified“. In Light Metals 2012, 369–74. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48179-1_62.

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Rodriguez, Carlos M., Adriana E. Candia, Carlos E. Schvezov, Mario R. Rosenberger und Alicia Ares. „Analysis of Thermal and Structural Parameters and Microhardess Variations in Different Al-Cu Alloys Directionally Solidified“. In Light Metals 2012, 369–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118359259.ch62.

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Hearn, Grant E., und Andrew V. Metcalfe. „Wave directionality monitoring“. In Spectral Analysis in Engineering, 184–207. Elsevier, 1995. http://dx.doi.org/10.1016/b978-034063171-3/50010-5.

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„Determining Motion and Directionality“. In Bloodstain Pattern Analysis, 165–84. CRC Press, 2001. http://dx.doi.org/10.1201/9781420041255-11.

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„Determining Motion and Directionality“. In Bloodstain Pattern Analysis. CRC Press, 2001. http://dx.doi.org/10.1201/9781420041255.ch5.

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Konferenzberichte zum Thema "Analysis of directionality"

LEPISTÖ, LEENA, IIVARI KUNTTU, ARI VISA und JORMA AUTIO. „RETRIEVAL OF NON-HOMOGENOUS TEXTURES BASED ON DIRECTIONALITY“. In Proceedings of the 4th European Workshop on Image Analysis for Multimedia Interactive Services. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704337_0020.

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Neve-Oz, Yair, Therese Pollok, Sven Burger, Michael Golosovsky, Ron Lifshitz, Dan Davidov, Theodore E. Simos, George Psihoyios und Ch Tsitouras. „Negative Refraction and Omni Directionality in 2D Photonic Quasicrystal Superstructure“. In ICNAAM 2010: International Conference of Numerical Analysis and Applied Mathematics 2010. AIP, 2010. http://dx.doi.org/10.1063/1.3498134.

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Yang, Su, Wang Jiang-ping, Zhang Yong-zhi und Li Yu-quan. „Analysis of directionality for Pulsed Magnetic Field Measurement Sensor“. In 2007 8th International Conference on Electronic Measurement and Instruments. IEEE, 2007. http://dx.doi.org/10.1109/icemi.2007.4351099.

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Menezes, Pradeep L., Kishore und Satish V. Kailas. „Effect of Directionality of Grinding Marks on Friction and Formation of Transfer Layer“. In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59010.

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Surface texture influences friction and transfer layer formation during sliding. In the present investigation, basic studies were conducted using inclined pin-on-plate sliding tester to understand the effect of directionality of surface grinding marks of hard material on friction and transfer layer formation during sliding against soft materials. 080 M40 steel plates were ground to attain different surface roughness with unidirectional grinding marks. Then pins made of soft materials such as pure Al, pure Mg and Al-Mg alloy were slid against the prepared steel plates. Grinding angle (i.e., the angle between direction of sliding and grinding marks) was varied between 0° and 90° in the tests. Experiments were conducted under both dry and lubricated conditions on each plate in ambient environment. It was observed that the transfer layer formation and the coefficient of friction, which has two components — adhesion and plowing — depend primarily on the directionality of grinding marks of the harder mating surface, and independent of surface roughness of the harder mating surface. For the case of pure Mg, stick-slip phenomenon was observed under dry condition for all grinding angles and it was absent upto 20° grinding angles under lubricated condition. However, for the case of Al, it was observed only under lubricated conditions for angles exceeding 20°. As regards the alloy, namely, Al-Mg alloy, it was absent in both conditions. For the case of pure Mg and Al, it was observed that the amplitude of stick-slip motion primarily depends on plowing component of friction. The grinding angle effect on coefficient of friction was attributed to the variation of plowing component of friction with grinding angle.

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Bartkowiak, Tomasz. „Characterization of 3D Surface Texture Directionality Using Multi-Scale Curvature Tensor Analysis“. In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71609.

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Anisotropy of surface texture can in many practical cases significantly affect the interaction between the surface and phenomena that influence or are influenced by the topography. Tribological contacts in sheet forming, wetting behavior or dental wear are good examples. This article introduces and exemplifies a method for quantification and visualization of anisotropy using the newly developed 3D multi-scale curvature tensor analysis. Examples of a milled steel surface, which exhibited an evident anisotropy, and a ruby contact probe surface, which was the example of isotropic surface, were measured by the confocal microscope. They were presented in the paper to support the proposed approach. In the method, the curvature tensor T is calculated using three proximate unit vectors normal to the surface. The multi-scale effect is achieved by changing the size of the sampling interval for the estimation of the normals. Normals are estimated from regular meshes by applying a covariance matrix method. Estimation of curvature tensor allows determination of two directions around which surface bends the most and the least (principal directions) and the bending radii (principal curvatures). The direction of the normal plane, where the curvature took its maximum, could be plotted for each analyzed region and scale. In addition, 2D and 3D distribution graphs could be provided to visualize anisotropic or isotropic characteristics. This helps to determine the dominant texture direction or directions for each scale. In contrast to commonly used surface isotropy/anisotropy determination techniques such as Fourier transform or autocorrelation, the presented method provides the analysis in 3D and for every region at each scale. Thus, different aspects of the studied surfaces could clearly be seen at different scales.

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Park, MyungGu, und Jaeil Jung. „An analysis of communication performance according to antenna directionality in UAV operation environment“. In 2010 2nd IEEE International Conference on Network Infrastructure and Digital Content (IC-NIDC 2010). IEEE, 2010. http://dx.doi.org/10.1109/icnidc.2010.5657918.

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Anwar, A. R., M. Muthalib, S. Perrey, A. Galka, O. Granert, S. Wolff, G. Deuschl, J. Raethjen, U. Heute und M. Muthuraman. „Directionality analysis on functional magnetic resonance imaging during motor task using Granger Causality“. In 2012 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2012. http://dx.doi.org/10.1109/embc.2012.6346419.

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Dang, Shilpa, Santanu Chaudhury, Brejesh Lall und Prasun Kumar Roy. „Assessing assumptions of multivariate linear regression framework implemented for directionality analysis of fMRI“. In 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2015. http://dx.doi.org/10.1109/embc.2015.7318990.

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Beserra, Eliab R., Andre´ L. T. Mendes, Segen F. Estefen und Carlos E. Parente. „Wave Climate Analysis for a Wave Energy Conversion Application in Brazil“. In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29597.

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A variety of ocean wave energy conversion devices have been proposed worldwide considering different technology and energy extraction methods. In order to support full-scale prototype design and performance assessments of a conversion scheme to be deployed on the northern coast of Brazil, a long-term wave climate analysis is under development. A 5-year pitch-roll buoy data series has been investigated through an adaptive technique to enhance spatial resolution and allow for accurate wave directionality evaluation. Device design most influential variables such as extreme significant wave height, peak period and directionality were considered. Temporal variability in wave energy levels was particularly investigated for energy resource assessment. The major findings of this work include the narrow directional amplitude of the incident wave and higher significant wave heights of locally generated waves. The estimated energy resource levels agreed well with literature, also showing little annual fluctuation. The wave climate demonstrated to be in full agreement with the large-scale Equatorial Atlantic atmospheric variability, dominated by either local wind waves or by distant storm swells.

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Pilkinton, Gregory, und Benjamin Cimerman. „Prediction of vehicle noise signature using source directionality in combination with Statistical Energy Analysis“. In 5th AIAA/CEAS Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-1906.

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