Relevant bibliographies by topics / Directional dependence

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Directional dependence'

Author: Grafiati
Published: 25 May 2024
Last updated: 22 June 2025

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Journal articles on the topic "Directional dependence"

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Noh, Hohsuk, Hyuna Jang, Kun Ho Kim, and Jong-Min Kim. "Nonparametric Directional Dependence Estimation and Its Application to Cryptocurrency." Axioms 12, no. 3 (2023): 293. http://dx.doi.org/10.3390/axioms12030293.

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This paper proposes a nonparametric directional dependence by using the local polynomial regression technique. With data generated from a bivariate copula having a nonmonotone regression structure, we show that our nonparametric directional dependence is superior to the copula directional dependence method in terms of the root-mean-square error. To validate the directional dependence with real data, we use the log returns of daily prices of Bitcoin, Ethereum, Ripple, and Stellar. We conclude that our nonparametric directional dependence, by using the local polynomial regression technique with asymmetric-threshold GARCH models for marginal distributions, detects the directional dependence better than the copula directional dependence method by an asymmetric GARCH model.
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von Eye, Alexander, and Richard P. DeShon. "Decisions concerning directional dependence." International Journal of Behavioral Development 36, no. 4 (2012): 323–26. http://dx.doi.org/10.1177/0165025412450111.

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Aslanov, T. G., and S. A. Ibragimov. "STUDY OF THE TOPOLOGY OF THE VIVALDI ANTENNA WITH A MIRROR ARRANGEMENT OF THE PETALS." Herald of Dagestan State Technical University. Technical Sciences 45, no. 3 (2019): 76–84. http://dx.doi.org/10.21822/2073-6185-2018-45-3-76-84.

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Objectives. In work questions of a research of topology of the antenna of Vivaldi with a mirror arrangement of petals are considered.Method. By modeling in the program CST MicroWave Studio environment collecting necessary data, in particular dependence of width of the directional pattern on curvature and a distance from the middle of the top part of the antenna to the petal antenna petals is carried out.Result. Graphic dependences of curvature of petals and size of a distance from the middle of the top part of the antenna to the petal on directional pattern width in two planes for various frequencies are constructed. Approximation of the received dependences for two planes θ = 900 (the antenna plane) and φ = 00 is carried out (the plane perpendicular the antenna planes). The equations of the approximating curves for various frequencies are received. The analysis of change of curve dependences of curvature of petals and width of a distance from the middle of the top part of the antenna to the petal from directional pattern width upon transition from one frequency is carried out to another. The dependence of the standing wave ratio (VSWR) of the antenna on teflon thickness is investigated. The dependence of a strip of working frequencies on the sizes of the antenna is investigated.Conclusion. Dependences of topology of the antenna on directional pattern width on the range of frequencies of the antenna are revealed. Problems of construction and optimization of model of the set characteristics are solved. The mathematical model allowing depending on the set frequency and width of the directional pattern is received to receive necessary topology of petals of the antenna.
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Thoemmes, Felix. "Empirical evaluation of directional-dependence tests." International Journal of Behavioral Development 39, no. 6 (2015): 560–69. http://dx.doi.org/10.1177/0165025415582055.

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Testing of directional dependence is a method to infer causal direction that recently has attracted some attention. Previous examples by e.g. von Eye and DeShon (2012a) and extensive simulation studies by Pornprasertmanit and Little (2012) have demonstrated that under specific assumptions, directional-dependence tests can recover the true causal direction between two variables. Simulation results are important in the evaluation of any statistical method, but they are necessarily less complex than real data that come with potential irregularities (e.g. departures from linearity, presence of confounders, etc.). In this article, we evaluate the performance of directional-dependence tests using benchmark data consisting of 65 variable pairs with known causal order. We find that between 21% and 43% of all cases are correctly classified using different directional-dependence tests that rely on differences in skew, kurtosis, or a combined measure. We then examine some of the assumptions of the directional-dependence test and find that for virtually all variable pairs, some assumptions are violated. When only pairs in which assumptions are fulfilled are selected, performance of all directional-dependence tests improves. We probe whether particular features of the variable pairs impact whether a test yields a correct or incorrect result, but find no strong predictors. Our findings provide a complimentary picture to previously conducted simulation studies, and highlight the fact that directional-dependence tests are prone to causal classification errors when key assumptions are violated. Such violations are potentially common in real data.
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von Eye, Alexander, and Richard P. DeShon. "Directional dependence in developmental research." International Journal of Behavioral Development 36, no. 4 (2012): 303–12. http://dx.doi.org/10.1177/0165025412439968.

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In this article, we discuss and propose methods that may be of use to determine direction of dependence in non-normally distributed variables. First, it is shown that standard regression analysis is unable to distinguish between explanatory and response variables. Then, skewness and kurtosis are discussed as tools to assess deviation from normality. Deviation from normality can be used to assess direction of dependence. This proposition is based on the fact that the response variable will always have less skew than the independent variable (Dodge & Rousson, 2000). It has been shown that the cube of the Pearson correlation coefficient can be calculated as the ratio of the skewness measures of the correlated variables. Because correlations cannot exceed the interval (−1.0; +1.0), directional dependence of the two correlated variables can be determined by the ratio that results in a correlation that stays within this interval. It is also proposed that other measures of deviation from normality can be used to determine directional dependence; for example, kurtosis. Recommendations are given for making decisions concerning directional dependence. Empirical data examples from developmental research on violence against women and on attention deficit hyperactivity disorder (ADHD) illustrate the use of the methodology. Cross-sectional and temporal directional dependence are discussed, and the effects of onset of a causal agent and termination of a causal agent are illustrated.
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Quesada-Molina, José Juan, and Manuel Úbeda-Flores. "Directional dependence of random vectors." Information Sciences 215 (December 2012): 67–74. http://dx.doi.org/10.1016/j.ins.2012.05.019.

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Nelsen, Roger B., and Manuel Úbeda-Flores. "Directional dependence in multivariate distributions." Annals of the Institute of Statistical Mathematics 64, no. 3 (2011): 677–85. http://dx.doi.org/10.1007/s10463-011-0329-6.

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Hyun, Steve, Jimin Lee, Jong-Min Kim, and Chulhee Jun. "What Coins Lead in the Cryptocurrency Market: Using Copula and Neural Networks Models." Journal of Risk and Financial Management 12, no. 3 (2019): 132. http://dx.doi.org/10.3390/jrfm12030132.

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Exploring dependence structures between financial time series has been important within a wide range of applications. The main aim of this paper is to examine dependence relationships among five well-known cryptocurrencies—Bitcoin, Ethereum, Litecoin, Ripple, and Stella—by a copula directional dependence (CDD). By employing a neural network autoregression model to avoid the serial dependence in each individual cryptocurrency, we generate residuals of the fitted models with time series of daily log-returns in percentage of the five cryptocurrencies and then we apply a Gaussian copula marginal beta regression model to the residuals to explore the CDD. The results show that the CDD from Bitcoin to Litecoin is highest among all ordered directional dependencies and the CDDs from Ethereum to the other four cryptocurrencies are relatively higher than the CDDs to Ethereum from those cryptocurrencies. This finding implies that the return shocks of Bitcoin have the most effect on Litecoin and the return shocks of Ethereum relatively influence the shocks on the other four cryptocurrencies instead of being affected by them. This allows investors to build the market-timing strategies by observing the directional flow of return shocks among cryptocurrencies.
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Middlebrooks, John C., and David M. Green. "Directional dependence of interaural envelope delays." Journal of the Acoustical Society of America 87, no. 5 (1990): 2149–62. http://dx.doi.org/10.1121/1.399183.

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Sungur, Engin A., and Jessica M. Orth. "Understanding Directional Dependence Through Angular Correlation." Communications in Statistics - Theory and Methods 43, no. 19 (2014): 4143–55. http://dx.doi.org/10.1080/03610926.2012.707735.

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Dissertations / Theses on the topic "Directional dependence"

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Sanchez, Caballero Lizeth Katherine. "Geostatistical modeling of geotechnical variables considering directional dependence." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. https://thesesprivees.mines-paristech.fr/2022/2022UPSLM045_archivage.pdf.

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Avec la modélisation géologique et géométallurgique, la modélisation géotechnique est l'une des composantes essentielles de la planification et du développement de projets miniers à ciel ouvert et souterrains. Une caractéristique particulière de nombreuses variables géotechniques est d'être dépendante de la direction, c'est-à-dire que la mesure d'une carotte de sondage dépend non seulement de sa position géographique mais aussi de son orientation. Pour tenir compte de cette caractéristique, il est proposé de régionaliser les variables géotechniques dans un espace à cinq dimensions correspondant au produit sur l'espace géographique à trois dimensions et la sphère à deux dimensions, de sorte que chaque mesure soit indexée par ses coordonnées est, nord, élévation, azimut et pendage. Au lieu de faire des prédictions et des simulations conditionnées à une direction particulière, ce nouveau paradigme permet d'interpoler des variables géotechniques à n'importe quel endroit de l'espace géographique, et pour n'importe quelle direction. La structure de corrélation spatiale peut être inférée et modélisée en utilisant des covariances séparables ou des combinaisons de covariances séparables, sous une hypothèse de stationnarité dans l'espace géographique et d'isotropie sur la sphère. De plus, une simulation conditionnelle peut être effectuée par des méthodes spectrales ou de bandes tournantes, basées sur des produits de champs aléatoires stationnaires dans l'espace géographique et de champs aléatoires isotropes sur la sphère. La méthodologie proposée est illustrée par modélisation de la fréquence de discontinuité linéaire (P10), la désignation de la qualité de la roche (RQD), et le Slope Mass Rating (SMR) dans trois gisements miniers<br>Together with geological and geometallurgical modeling, geotechnical modeling is one of the essential components for the planning and development of open pit and underground mining projects. A particular characteristic of many geotechnical variables is to be direction-dependent, i.e., the measurement of a core sample not only depends on the in-situ position of this sample but also on its in-situ orientation. To account for this characteristic, it is proposed to regionalize such variables in a five-dimensional space corresponding to the product on the three-dimensional geographical space and the two-dimensional sphere, so that each measurement is indexed by its easting, northing, elevation, azimuth, and dip. Instead of making predictions and simulations conditioned to a particular direction, this new paradigm allows geotechnical variables to be interpolated at any place in the geographic space, for any direction. The spatial correlation structure can be inferred and modeled by using separable covariances or combinations of separable covariances, under an assumption of stationarity in the geographical space and isotropy on the sphere. Also, conditional simulation can be performed by turning bands, based on products of stationary random fields in the geographic space and isotropic random fields on the sphere. The proposed methodology is illustrated with the modeling of the linear discontinuity frequency (P10), the rock quality designation (RQD), and Slope Mass Rating (SMR) in three mineral deposits
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Ulbrich, Carolin [Verfasser]. "Spectral and directional dependence of light-trapping in solar cells / Carolin Ulbrich." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2011. http://d-nb.info/1018190570/34.

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Yoder, Tim. "Investigation in to nonlinear grasshoff number dependence of convection within a hot melt during directional solidification." Connect to this title online, 2005. http://hdl.handle.net/1811/311.

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Thesis (Honors)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formattted into pages: contains 31 p.; also includes graphics. Includes bibliographical references (p. 31). Available online via Ohio State University's Knowledge Bank.
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Bourgeois, Raymond C. "Phonotactic orientation behavior of tethered flying crickets (Teleogryllus oceanicus) and its dependence on stimulus carrier frequency." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63311.

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Noureldin, Diaa. "Essays on multivariate volatility and dependence models for financial time series." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:fdf82d35-a5e7-4295-b7bf-c7009cad7b56.

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This thesis investigates the modelling and forecasting of multivariate volatility and dependence in financial time series. The first paper proposes a new model for forecasting changes in the term structure (TS) of interest rates. Using the level, slope and curvature factors of the dynamic Nelson-Siegel model, we build a time-varying copula model for the factor dynamics allowing for departure from the normality assumption typically adopted in TS models. To induce relative immunity to structural breaks, we model and forecast the factor changes and not the factor levels. Using US Treasury yields for the period 1986:3-2010:12, our in-sample analysis indicates model stability and we show statistically significant gains due to allowing for a time-varying dependence structure which permits joint extreme factor movements. Our out-of-sample analysis indicates the model's superior ability to forecast the conditional mean in terms of root mean square error reductions and directional forecast accuracy. The forecast gains are stronger during the recent financial crisis. We also conduct out-of-sample model evaluation based on conditional density forecasts. The second paper introduces a new class of multivariate volatility models that utilizes high-frequency data. We discuss the models' dynamics and highlight their differences from multivariate GARCH models. We also discuss their covariance targeting specification and provide closed-form formulas for multi-step forecasts. Estimation and inference strategies are outlined. Empirical results suggest that the HEAVY model outperforms the multivariate GARCH model out-of-sample, with the gains being particularly significant at short forecast horizons. Forecast gains are obtained for both forecast variances and correlations. The third paper introduces a new class of multivariate volatility models which is easy to estimate using covariance targeting. The key idea is to rotate the returns and then fit them using a BEKK model for the conditional covariance with the identity matrix as the covariance target. The extension to DCC type models is given, enriching this class. We focus primarily on diagonal BEKK and DCC models, and a related parameterisation which imposes common persistence on all elements of the conditional covariance matrix. Inference for these models is computationally attractive, and the asymptotics is standard. The techniques are illustrated using recent data on the S&P 500 ETF and some DJIA stocks, including comparisons to the related orthogonal GARCH models.
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Zhao, Ding. "Spherulitic Growth and Thermodynamic Equilibrium in Multicomponent Elastic Films Under Solvent-vapor Annealing." UKnowledge, 2018. https://uknowledge.uky.edu/math_etds/56.

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In this dissertation, we will study solvent-vapor induced spherulitic growth in multicomponent thin films modeled as prestressed elastic solids. The interface between the crystalline phase and the amorphous phase will be treated as an evolving thermodynamic system and no diffusion of any component will be considered. The dissertation is divided into three parts. In Part I we will determine necessary conditions of thermodynamic equilibrium between the two solid phases, the inter- face, and the vapor. In Part II we will derive the thermodynamic driving force for spherulitic growth in multicomponent elastic thin films. In Part III we will investigate the effect of prestress on the directional dependence of the growth. There a formula that delineates how the prestress affects the shape of the spherulite will be proposed.
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Fisch, Adam(Adam Joshua). "Typology-aware neural dependency parsing : challenges and directions." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/128400.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2020<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 39-41).<br>This thesis explores the task of leveraging typology in the context of cross-lingual dependency parsing. While this linguistic information has shown great promise in pre-neural parsing, results for neural architectures have been mixed. The aim of the investigation put forth in this thesis is to better understand this state-of-the-art. Our main findings are as follows: 1) The benefit of typological information is derived from coarsely grouping languages into syntactically-homogeneous clusters rather than from learning to leverage variations along individual typological dimensions in a compositional manner; 2) Typology consistent with the actual corpus statistics yields better transfer performance; 3) Typological similarity is only a rough proxy of cross-lingual transferability with respect to parsing. Code for the work in this thesis is available at https://github.com/ajfisch/TypologyParser.<br>by Adam Fisch.<br>S.M.<br>S.M. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
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Jack, David Abram. "Incorporation of directionally dependent diffusion with polymer composite flow theory." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4579.

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Thesis (M.S.) University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 23, 2007) Includes bibliographical references.
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Jagannathan, Preshanth. "Full Mueller imaging: direction dependent corrections in polarimetric radio imaging." Doctoral thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/28421.

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Magnetic fields pervade the universe, spanning a multitude of scales from the dipolar field on Earth, to the largest gravitationally bound structures such as galaxy clusters [1]. The magnetic fields play a vital role in the evolution of these astronomical systems. In addition to the multitude of scales, magnetic fields are present in different astronomical systems of varying strengths. The strongest observed astronomical magnetic fields are in neutron stars with a field strength of ≈ 1015 G [2], far higher than any man-made fields till date. In stark contrast magnetic fields in the interstellar medium while ubiquitous are only a few µG in field strength. Many fundamental processes in astrophysics have magnetism at their heart, be it cosmic ray particle acceleration, star formation, or the launch of radio galaxy jets, pulsars, etc. One key fundamental process that allows us to detect and characterize cosmic magnetic fields with radio astronomy is the polarization of synchrotron radiation. Synchrotron radiation is intrinsically polarized broadband continuum radiation emitted by relativistic charged particles accelerated by the presence of magnetic fields. The emissivity of the synchrotron radiation is tied to the magnetic field strength B and the spectral index α (defined such that the flux density S ∝ ν −α ) such that ε ∝ B 1+α .
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Chehab, Abdul Ghafar. "Time dependent response of pulled-in-place HDPE pipes." Thesis, Kingston, Ont. : [s.n.], 2008. http://hdl.handle.net/1974/1239.

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Books on the topic "Directional dependence"

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L, Maples Anna, and United States. National Aeronautics and Space Administration., eds. MPS solidification model: Final report, analysis and calculation of macrosegregation in a casting ingot. General Electric Co., Space Systems Division, Huntsville Center Operations, 1985.

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Thompson, John A. The portable executive: Building your own job security from corporate dependency to self-direction. Simon & Schuster, 1995.

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G, Long D., and United States. National Aeronautics and Space Administration., eds. Dependence of the normalized radar cross section of water waves on Bragg wavelength-wind speed sensitivity. National Aeronautics and Space Administration, 1996.

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Canada. Bureau of Dangerous Drugs. and Canada. Health and Welfare Canada., eds. The use of opioids in the management of opioid dependence: Drugs Directorate guidelines = L'utilisation des opioïdes dans le traitement de la dépendance aux opioïdes : directives de la Direction des médicaments. Bureau of Dangerous Drugs, Drugs Directorate, Health Protection Branch, Health and Welfare Canada, 1992.

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1931-, Sakamoto N., Angel Aubie, Hotta N, International Congress on Obesity (6th : 1990 : Kōbe-shi, Japan), and International Satellite Symposium on Obesity and Diabetes Mellitus (1990 : Nagoya-shi, Japan), eds. New directions in research and clinical works for obesity and diabetes mellitus: Proceedings of a satellite symposium of the 6th International Congress of Obesity : obesity and diabetes mellitus, Nagoya, Japan, 18-19 October 1990. Excerpta Medica, 1991.

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United States. National Aeronautics and Space Administration., ed. Numerical studies of boundary-layer receptivity: A progress report. National Aeronautics and Space Administration, 1995.

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Vallejo Maldonado, Pablo Ramon, and Nikolay Chaynov. Kinematics and dynamics of automobile piston engines. INFRA-M Academic Publishing LLC., 2019. http://dx.doi.org/10.12737/989072.

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The fundamentals of kinematics and dynamics of transport piston internal combustion engines made using different layout schemes are presented. Along with the traditional in-line, V-shaped, including oppositional, arrangement of cylinders, schemes with "staggered" arrangement of cylinders in the block at the displaced connecting rod necks of the crankshaft of the engine are considered. The kinematics of the coaxial crank mechanism is considered in detail. The questions of dynamics with reduction of calculated dependences of forces, moments, a choice of a rational order of work of cylinders in relation to the considered kinematic schemes are in detail stated. Considerable attention is paid to the unevenness of the crankshaft rotation speed and engine balancing. The loads on the main and connecting rod bearings of the crankshaft, the knowledge of which is necessary in determining the bearing capacity of bearing units, are also considered.&#x0D; Meets the requirements of the Federal state educational standards of higher education of the last generation.&#x0D; For students of higher educational institutions studying in the direction of training 23.03.03 "Operation of transport and technological machines and complexes" and related areas.
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United States. Congress. House. Committee on Small Business. Subcommittee on Regulation, Business Opportunities, and Technology. Suitability, direction, and funding of federal economic development assistance programs for small, timber-dependent communities in the Northwest: Hearing before the Subcommittee on Regulation, Business Opportunities, and Technology of the Committee on Small Business, House of Representatives, One Hundred Third Congress, first session, Portland, OR, December 15, 1993. U.S. G.P.O., 1994.

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United States. Congress. House. Committee on Small Business. Subcommittee on Regulation, Business Opportunities, and Technology. Suitability, direction, and funding of federal economic development assistance programs for small, timber-dependent communities in the Northwest: Hearing before the Subcommittee on Regulation, Business Opportunities, and Technology of the Committee on Small Business, House of Representatives, One Hundred Third Congress, first session, Portland, OR, December 15, 1993. U.S. G.P.O., 1994.

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Eye, Alexander von, Wolfgang Wiedermann, Daeyoung Kim, and Engin Sungur. Direction Dependence in Statistical Modeling: Methods of Analysis. Wiley & Sons, Limited, John, 2020.

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Book chapters on the topic "Directional dependence"

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Beran, Jan, Britta Steffens, and Sucharita Ghosh. "Long-Range Dependence in Directional Data." In Forum for Interdisciplinary Mathematics. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1044-9_21.

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Terdik, György. "Long Range Dependence in Third Order for Non-Gaussian Time Series." In Advances in Directional and Linear Statistics. Physica-Verlag HD, 2010. http://dx.doi.org/10.1007/978-3-7908-2628-9_18.

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Kim, Seongyong, and Daeyoung Kim. "Directional Dependence Analysis Using Skew-Normal Copula-Based Regression." In Statistics and Causality. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118947074.ch6.

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Wei, Zheng, Tonghui Wang, and Daeyoung Kim. "Multiple Copula Regression Function and Directional Dependence Under Multivariate Non-exchangeable Copulas." In Causal Inference in Econometrics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-27284-9_10.

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Xu, Y. B., Y. H. Sha, J. H. Zhang, and Z. Q. Hu. "Orientation Dependence of Directional Coarsening in a Single Crystal Nickel-Base Superalloy." In Fatigue and Fracture Behavior of High Temperature Materials. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118787823.ch12.

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McLean, J. S., A. Medina, R. Sutton, and H. Foltz. "Directional Dependence of the Minimum-Phase Property of the TEM Horn Transfer Function." In Ultra-Wideband, Short-Pulse Electromagnetics 10. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-9500-0_16.

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Gutierrez-López, Alfonso, Marilú Meza-Ruiz, and Jose Vargas-Baecheler. "Analysis of the Spatial Dependence of Rainfall Fields in the Southeast of Mexico, Using Directional Variograms." In Water Resources of Mexico. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40686-8_14.

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Zuerch, Michael. "Ultrafast Second-Harmonic XUV Spectroscopy: A Novel Probe for Symmetry." In Springer Proceedings in Physics. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-47938-0_16.

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AbstractExtreme-ultraviolet second-harmonic generation spectroscopy (XUV-SHG) is a novel spectroscopy that enables probing element-selective symmetry-broken states. This renders XUV-SHG especially useful to study surfaces, interfaces, and symmetry-broken bulk states in otherwise complex chemical environments. In a string of recent works, XUV-SHG was successfully applied to study the role of lithium in various compounds. One of the most striking recent results studied the role of Li symmetry-breaking displacement causing the emergence of polarity in the polar metal LiOsO3. Furthermore, the directional dependence of the SHG process allows geometry specific measurements. Given the femtosecond nature of the probe pulses, one can readily envision this method to be applied to study interfacial carrier dynamics in complex in-operando environments that are difficult to probe with conventional ultrafast methods.
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Dodge, Yadolah, and Iraj Yadegari. "Measuring directional dependency." In Institute of Mathematical Statistics Collections. Institute of Mathematical Statistics, 2010. http://dx.doi.org/10.1214/10-imscoll706.

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Falsafi, Babak, Samuel Midkiff, JackB Dennis, et al. "Dependence Direction Vector." In Encyclopedia of Parallel Computing. Springer US, 2011. http://dx.doi.org/10.1007/978-0-387-09766-4_2312.

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Conference papers on the topic "Directional dependence"

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Kafle, L., U. Mok, H. H. Einstein, R. Villamor-Lora, and J. Germaine. "Characterization of Direction-Dependent Properties of Sierra White Granite: Initial Results." In 58th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2024. http://dx.doi.org/10.56952/arma-2024-0544.

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ABSTRACT: Most granites have preferred directions ("rift", "grain", and "hardway") that affect the ease with which the rock can be split. In this study, we present a series of uniaxial and triaxial tests on the directional-dependent properties of Sierra White Granite, a rock that has been chosen as a laboratory analog for the FORGE site granitoid. We performed triaxial tests on 1.5" by 3.5" cylindrical cores involving a test program including isotropic compression, cyclic loading, and triaxial compression in three preferred directions under low to high confining pressure. In these tests, we measured stress, displacement, axial and circumferential strain, and P-wave velocity. We found no significant degree of direction dependency in the deformation (stiffness) and strength parameters. On the other hand, the P-wave velocity results show the largest velocity along (equation) (direction perpendicular to plane C) then (equation) and (equation). More tests are needed to accurately quantify the direction-dependent behavior of the given test material. 1. INTRODUCTION The direction dependence (anisotropy) of granite is often reported in the literature, both in relation to practical engineering and scientific aspects. With respect to practical engineering, the best known are the orthogonally oriented so-called "quarry planes" rift, grain, and hardway, indicating the ease of splitting or cleavage in this sequence (i.e., rift the easiest, and hardway the hardest). In quarrying, this direction dependence is often used to split the rock by a hammer blow in the rift direction. From the geotechnical viewpoint, one wants to know what causes the direction dependence, if it affects other small- and larger-scale properties, and what these effects are. Moreover, understanding the material reaction to external influences such as stress, temperature, electrical currents, and chemical agents, is also important to better design geotechnical structures. Most researchers agree that the mechanical properties along the rift orientation depend on the orientation of microcracks and fluid intrusions – which in turn are affected by the direction dependence of quartz (see e.g. Douglass &amp; Voight, 1969; Osborne, 1935). The reasons behind the other two directional dependencies are less clear, but most likely involve the effects of foliation, large-scale stress, and/or temperature changes (Osborne, 1935). It should be noted, however, that some granite samples used in laboratory experiments do not show preferred directions (Chen et al., 1999).
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Schön, J. H., D. T. Georgi, and O. Fanini. "Imparting Directional Dependence on Log-derived Permeability." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2001. http://dx.doi.org/10.2118/71721-ms.

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Matsui, W. "Directional dependence of indoor multipath propagation characteristics." In IEEE Antennas and Propagation Society International Symposium 1992 Digest. IEEE, 1992. http://dx.doi.org/10.1109/aps.1992.221638.

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Das, Alok K., Amar K. Ganguly, Mehabub A. Mondal, and Dilip K. Paul. "Temperature dependence of polymer waveguide directional coupler." In Optical Tools for Manufacturing and Advanced Automation, edited by Ramon P. DePaula. SPIE, 1994. http://dx.doi.org/10.1117/12.169935.

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Al-Naami, Khaled, Swarup Chandra, Ahmad Mustafa, et al. "Adaptive encrypted traffic fingerprinting with bi-directional dependence." In ACSAC '16: 2016 Annual Computer Security Applications Conference. ACM, 2016. http://dx.doi.org/10.1145/2991079.2991123.

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Sawada, Hirokazu, Hiroyuki Nakase, Shuzo Kato, Masahiro Umehira, Katsuyoshi Sato, and Hiroshi Harada. "Polarization dependence in double directional propagation channel at 60GHz." In 2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2009). IEEE, 2009. http://dx.doi.org/10.1109/pimrc.2009.5450006.

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LIU, P., Y. W. ZHANG, and C. LU. "DIRECTIONAL DEPENDENCE OF SURFACE MORPHOLOGICAL EVOLUTION OF HETEROEPITAXIAL FILMS." In Proceedings of the International Conference on Scientific and Engineering Computation (IC-SEC) 2002. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949524_0104.

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Ravelo, Ramon. "Directional-Dependence in Shock-Induced Melting of FCC Metals." In SHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2006. http://dx.doi.org/10.1063/1.2263315.

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Jalden, Niklas, Per Zetterberg, and Bjorn Ottersten. "Directional Dependence of Large Scale Parameters in Wireless Channel Models." In 2008 IEEE Wireless Communications and Networking Conference. IEEE, 2008. http://dx.doi.org/10.1109/wcnc.2008.220.

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Lozano-Crisóstomo, N., D. A. May-Arrioja, M. Torres-Cisneros, J. A. Andrade-Lucio, J. J. Sánchez-Mondragón, and G. P. Agrawal. "Nanowires geometry dependence of coupling properties of a hybrid directional coupler." In Latin America Optics and Photonics Conference. OSA, 2012. http://dx.doi.org/10.1364/laop.2012.lm2a.28.

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Reports on the topic "Directional dependence"

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Linton, Oliver, Tatsushi Oka, Yoon-Jae Whang, and Heejoon Han. The cross-quantilogram: measuring quantile dependence and testing directional predictability between time series. Institute for Fiscal Studies, 2014. http://dx.doi.org/10.1920/wp.cem.2014.0614.

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Brush, L. N., S. R. Coriell, and G. B. McFadden. Directional solidification of a planar interface in the presence of a time-dependent electric current. National Institute of Standards and Technology, 1989. http://dx.doi.org/10.6028/nist.ir.89-4161.

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SHEVTSOVA, T. P. ON THE IMPACT OF VAT ON THE CHOICE OF TAXATION REGIME IN AGRICULTURE. Science and Innovation Center Publishing House, 2022. http://dx.doi.org/10.12731/2070-7568-2022-11-2-3-38-43.

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The analysis of the reporting of the Federal Tax Service on tax revenues from agricultural producers to the budget has been carried out, trends in the behavior of taxpayers in connection with the provision of new benefits after their introduction have been identified, directions for further improvement of taxation in agriculture, taking into account the interests of the state and taxpayers, have been identified, directions for studying the dependence of tax policy in the regional aspect.
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Eshed, Yuval, and Sarah Hake. Shaping plant architecture by age dependent programs: implications for food, feed and biofuel. United States Department of Agriculture, 2012. http://dx.doi.org/10.32747/2012.7597922.bard.

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Age dependent programs are responsible for the physiological and developmental differences of young and mature plants. These include a range of morphological characters such as leaf shape and leaf composition (waxes, lignin etc..) but also different in developmental potentials. Apical buds of juvenile plants are vegetative, while those of mature plants can be reproductive. Likewise, basal buds form in the axills of juvenile leaves have different fates than distal buds formed in the axils of mature leaves. The goal of our joint project is to understand and exploit theses age related programs for specific improvement of crop plants. To that end both the WIS group and the PGEC group are using mutants with age related defects as well as modified expression of miR156 to modify age related programs in crop plants- Tomato and potato in Israel and Maize, switchgrass and Brchipodium in the US. In the US, major effort were made to: Characterize the contribution of selected miR156 target genes to yield component traits of maize. Functional analysis of microRNAs and their targets in new crop plants. In Israel, the research progressed in several directions: Understanding the interplay between age dependent programs and the potential of tomato and potato meristems to produce tubers. Evaluation of the agronomic value of mutants that alter flowering regime in side shoots in general, and in the sympodial buds in particular Characterization of wild type axillary buds, comparing shoot ontogeny of gradually maturing apices from basal and distal positions along the main shoot of tomato.
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Sanginés, Jorge Carreto, Margherita Russo, and Annamaria Simonazzi. Mexico’s Automotive Industry: A Success Story? Institute for New Economic Thinking Working Paper Series, 2021. http://dx.doi.org/10.36687/inetwp166.

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largest world producer of automotive vehicles. The Mexican experience is part of the more general case of the “integrated peripheries.” The development of these cannot be accounted for separately from the developments occurring in its core country. Unlike the core-periphery literature, however, our analysis emphasizes that the various clusters of cores and integrated peripheries are not alike. In the case under study, the core has been systematically lagging behind the main transformations pioneered by its competitors. The paper traces the evolution of the Mexican automotive industry, emphasizing the difficulties faced by a late-comer country in developing an independent industry, and the importance of policy choices as well as the macroeconomic context in affecting its development. NAFTA represents the culmination of an integration process that has profoundly transformed the structure of the Mexican automotive industry, deepening its dependence on the US market. While there is no doubt that it has contributed to the spectacular growth of the Mexican auto industry, whether it also increased its resilience or, rather, its dependence is still an open question. This issue is particularly relevant in view of the transformations that are taking place in the automotive sector and in the geopolitical scenario. These include the end of NAFTA and the advent of USMCA, the entry of powerful competitors into the global market, and the transition to electric and autonomous vehicles, which all entail risks and opportunities. The lens of the centre-periphery relationship can help to understand the present integration of North America and its future direction.
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Barbato, Robyn, Robert Jones, Michael Musty, and Scott Slone. Reading the ground : understanding the response of bioelectric microbes to anthropogenic compounds in soil based terrestrial microbial fuel cells. Engineer Research and Development Center (U.S.), 2025. https://doi.org/10.21079/11681/49639.

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Electrogenic bacteria produce power in soil based terrestrial microbial fuel cells (tMFCs) by growing on electrodes and transferring electrons released from the breakdown of substrates. The direction and magnitude of voltage production is hypothesized to be dependent on the available substrates. A sensor technology was developed for compounds indicative of anthropological activity by exposing tMFCs to gasoline, petroleum, 2,4-dinitrotoluene, fertilizer, and urea. A machine learning classifier was trained to identify compounds based on the voltage patterns. After 5 to 10 days, the mean voltage stabilized (+/- 0.5 mV). After the entire incubation, voltage ranged from -59.1 mV to 631.8 mV, with the tMFCs containing urea and gasoline producing the highest (624 mV) and lowest (-9 mV) average voltage, respectively. The machine learning algorithm effectively discerned between gasoline, urea, and fertilizer with greater than 94% accuracy, demonstrating that this technology could be successfully operated as an environmental sensor for change detection.
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Allen, Jeffrey, Robert Moser, Zackery McClelland, Md Mohaiminul Islam, and Ling Liu. Phase-field modeling of nonequilibrium solidification processes in additive manufacturing. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42605.

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This project models dendrite growth during nonequilibrium solidification of binary alloys using the phase-field method (PFM). Understanding the dendrite formation processes is important because the microstructural features directly influence mechanical properties of the produced parts. An improved understanding of dendrite formation may inform design protocols to achieve optimized process parameters for controlled microstructures and enhanced properties of materials. To this end, this work implements a phase-field model to simulate directional solidification of binary alloys. For applications involving strong nonequilibrium effects, a modified antitrapping current model is incorporated to help eject solute into the liquid phase based on experimentally calibrated, velocity-dependent partitioning coefficient. Investigated allow systems include SCN, Si-As, and Ni-Nb. The SCN alloy is chosen to verify the computational method, and the other two are selected for a parametric study due to their different diffusion properties. The modified antitrapping current model is compared with the classical model in terms of predicted dendrite profiles, tip undercooling, and tip velocity. Solidification parameters—the cooling rate and the strength of anisotropy—are studied to reveal their influences on dendrite growth. Computational results demonstrate effectiveness of the PFM and the modified antitrapping current model in simulating rapid solidification with strong nonequilibrium at the interface.
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Zielinski, Daniel, James Kerr, Kim Bærum, Olivia Simmons, Ana Silva, and R. Goodwin. Advancements in riverine fish movement modeling : bridging environmental complexity and fish behavior. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/49423.

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Understanding fish movement and response in relation to their environment near infrastructure and migratory barriers is crucial for developing sustainable fisheries management solutions. Intermediate-scale movement models are a contemporary approach for understanding and predicting movement patterns of riverine fish considering their changing environment, which is predominately water flow. These models can be complex and require interdisciplinary knowledge. For more than 60 years, different approaches have been developed for investigating, reproducing, and predicting the movement outcomes of fish decision making. Due to the breadth of model frameworks available, a systematic review is helpful to summarize the available knowledge including a description of general model properties, environment modeling, agent characteristics, and methods of data use, output, and validation. The analysis of 38 studies found a wide range of model frameworks and architectures. Despite the lack of consistency, each model imposed some combination of the following behaviors: response to flow direction (i.e., rheotaxis), response to flow velocity magnitude, response to turbulence, response to depth, and memory/experience of the individual. There is a clear need for more consistent modeling approaches, increased consideration of memory/experience, inclusion of a wider range of species, incorporation of more detailed environmental covariates, and use of time-dependent solutions in fish movement models.
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Willits, Daniel H., Meir Teitel, Josef Tanny, Mary M. Peet, Shabtai Cohen, and Eli Matan. Comparing the performance of naturally ventilated and fan-ventilated greenhouses. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7586542.bard.

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The objectives of this project were to predict the performance of naturally and fan-ventilated greenhouses as a function of climate, type of crop, evaporative cooling and greenhouse size, and to estimate the effects of the two cooling systems on yield, quality and disease development in the different crops under study. Background In the competitive field of greenhouse cultivation, growers and designers in both the US and Israel are repeatedly forced to choose between naturally ventilated (NV) and fan ventilated (FV) cooling systems as they expand their ranges in an effort to remain profitable. The known advantages and disadvantages of each system do not presently allow a clear decision. Whether essentially zero operating costs can offset the less dependable cooling of natural ventilation systems is question this report hopes to answer. Major Conclusions US It was concluded very early on that FV greenhouses without evaporative pad cooling are not competitive with NV greenhouses during hot weather. During the first year, the US team found that average air temperatures were always higher in the FV houses, compared to the NV houses, when evaporative pad cooling was not used, regardless of ventilation rate in the FV houses or the vent configuration in the NV houses. Canopy temperatures were also higher in the FV ventilated houses when three vents were used in the NV houses. A second major conclusion was that the US team found that low pressure fogging (4 atm) in NV houses does not completely offset the advantage of evaporative pad cooling in FV houses. High pressure fog (65 atm) is more effective, but considerably more expensive. Israel Experiments were done with roses in the years 2003-2005 and with tomatoes in 2005. Three modes of natural ventilation (roof, side and side + roof openings) were compared with a fan-ventilated (with evaporative cooling) house. It was shown that under common practice of fan ventilation, during summer, the ventilation rate is usually lower with NV than with FV. The microclimate under both NV and FV was not homogeneous. In both treatments there were strong gradients in temperature and humidity in the vertical direction. In addition, there were gradients that developed in horizontal planes in a direction parallel to the direction of the prevailing air velocity within the greenhouse. The gradients in the horizontal direction appear to be larger with FV than with NV. The ratio between sensible and latent heat fluxes (Bowen ratio) was found to be dependent considerably on whether NV or FV is applied. This ratio was generally negative in the naturally ventilated house (about -0.14) and positive in the fan ventilated one (about 0.19). Theoretical models based on Penman-Monteith equation were used to predict the interior air and crop temperatures and the transpiration rate with NV. Good agreement between the model and experimental results was obtained with regard to the air temperature and transpiration with side and side + roof ventilation. However, the agreement was poor with only roof ventilation. The yield (number of rose stems longer than 40 cm) was higher with FV
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Petzke, Jonas, Dennis Kleinschmidt, and Florian Brüning. Simulative approach for predicting the heating behavior of elastomers in the solid-state microwave heating process. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.gs.ms.2.

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The increasing demand for energy efficient vulcanization of rubber extrusions requires the optimization and further development of existing processes. Microwave vulcanization allows the energy required for this process to be coupled directly into the material via dielectric losses. Microwave heating requires the polarity of the rubber so that the electromagnetic wave can cause the polar components of the material to vibrate. These vibrations cause internal friction, resulting in an increase in the temperature of the rubber compound. In this research project, microwaves were used to heat a rubber strand placed in a specially prepared waveguide. This method offers advantages over conventional methods, such as hot air vulcanization. A key advantage is that the energy is coupled directly into the material, resulting in low losses. In contrast to hot air vulcanization, where the air must first be heated, the heating of the material also takes place within the product to be heated. This results in a significant increase in energy efficiency, reaching up to 90 %. In addition, internal heating provides a more homogeneous heat distribution in the rubber strand compared to external heating by hot air vulcanization. To predict the heating behavior of rubber in the microwave process, a simulative model is created in the multiphysics simulation environment CST Studio Suite®. The model describes the microwave heating behavior of rubbers based on the thermodynamic and electromagnetic material data of the rubber compound. This simulation is known as a bi-directional simulation, so that temperature-dependent variables such as dielectric loss and thermal conductivity can be considered. The model is used to analyze parameter variations of the electromagnetic wave frequency, waveguide geometry, and strand orientation in the waveguide. Finally, optimized settings for the real process are recommended.
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