Relevant bibliographies by topics / Intensity gradient direction

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Intensity gradient direction'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Intensity gradient direction"

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Burgi, Pierre-Yves. "Motion estimation based on the direction of intensity gradient." Image and Vision Computing 22, no. 8 (2004): 637–53. http://dx.doi.org/10.1016/j.imavis.2004.01.003.

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Wang, Purong, and Guoyin Xu. "Development and Application Characteristics of High Gradient Magnetic Separator." Journal of Physics: Conference Series 2160, no. 1 (2022): 012057. http://dx.doi.org/10.1088/1742-6596/2160/1/012057.

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Abstract As one of the most effective techniques for fine particle processing, high gradient magnetic separation is mainly used in the separation and enrichment of fine and weak magnetic particles and other important industrial fields. High gradient magnetic separator is a new type of high intensity magnetic separator, which has strong ability to capture fine and weak magnetic particles, developed on the basis of ordinary high intensity magnetic separator. Based on the early periodic- high -gradient magnetic separators, the optimization development direction of high gradient magnetic separator
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Wang, Qiang, Chun Jiang Wang, Hai Tao Zhang, En Gang Wang, and Ji Cheng He. "Effects of High Gradient Magnetic Fields on Solidified Structures of Non-Magnetic Metals with Different Susceptibilities." Materials Science Forum 546-549 (May 2007): 1003–8. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1003.

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In the present study, the influencing factors such as the intensity and the direction of gradient magnetic fields, the magnetic susceptibilities of non-magnetic metals on the structures are studied theoretically and experimentally. In the theoretical analyses, the influences of high gradient magnetic fields on nucleation and structures are investigated. In the experimental research, high gradient magnetic fields are imposed on paramagnetic material Al and diamagnetic one Sn during their solidification processes. Then the macro- and microstructures of these samples are examined and the influenc
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Haris, Muhammad, Kazuhito Sawase, Muhammad Rahmat Widyanto, and Hajime Nobuhara. "An Efficient Super Resolution Based on Image Dimensionality Reduction Using Accumulative Intensity Gradient." Journal of Advanced Computational Intelligence and Intelligent Informatics 18, no. 4 (2014): 518–28. http://dx.doi.org/10.20965/jaciii.2014.p0518.

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An efficient super resolution algorithm based on edge direction is proposed based on the dimensional reduction of color images and 3 types of edge direction. The basic idea is to reduce image – especially color image – dimensions and to interpolate pixels by using 3 simple edge directions – vertical, horizontal, and diagonal. The proposed algorithm conceivably eliminate more color artifacts than Bicubic. The results of experiments using 30 natural images confirm that PSNR of the proposed method achieve the same quality as Fast Curvature Based Interpolation (FCBI). We confirmed that computation
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Nelson, J. Bradley. "An alternate derivation of the three‐dimensional Hilbert transform relations from first principles." GEOPHYSICS 51, no. 4 (1986): 1014–15. http://dx.doi.org/10.1190/1.1442141.

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Several techniques for determining the location, geometry, and strength of a source are based on a knowledge of the magnetic gradients generated by that source. Hood (1965), Bhattacharyya (1966), and Rao et al. (1981) detailed three of these gradient methods. For many years, geophysicists have used the two‐dimensional (2-D) Hilbert transform to approximate the vertical gradient from measurements of the horizontal gradient in the magnetic‐field intensity (Nabighian, 1972; Stanley and Green, 1976; Stanley, 1977; Mohan et al., 1982). This technique is of limited applicability because of the impli
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Cui, Junlong, Yong Hou, Zekun Jiang, et al. "Sparse-view cone-beam computed tomography iterative reconstruction based on new multi-gradient direction total variation." Journal of Cancer Research and Therapeutics 20, no. 2 (2024): 615–24. http://dx.doi.org/10.4103/jcrt.jcrt_1761_23.

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ABSTRACT Aim: The accurate reconstruction of cone-beam computed tomography (CBCT) from sparse projections is one of the most important areas for study. The compressed sensing theory has been widely employed in the sparse reconstruction of CBCT. However, the total variation (TV) approach solely uses information from the i-coordinate, j-coordinate, and k-coordinate gradients to reconstruct the CBCT image. Materials and Methods: It is well recognized that the CBCT image can be reconstructed more accurately with more gradient information from different directions. Thus, this study introduces a nov
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Cook, Mylan R., Kent L. Gee, and Scott D. Sommerfeldt. "A coherence-based phase and amplitude gradient estimator method for calculating active acoustic intensity." Journal of the Acoustical Society of America 151, no. 6 (2022): 4053–60. http://dx.doi.org/10.1121/10.0011731.

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The phase and amplitude gradient estimator (PAGE) method [Thomas, Christensen, and Gee, J. Acoust. Soc. Am. 137, 3366–3376 (2015)] has been developed as an alternative to the traditional p-p method for calculating energy-based acoustic measures such as active acoustic intensity. While this method shows many marked improvements over the traditional method, such as a wider valid frequency bandwidth for broadband sources, contaminating noise can lead to inaccurate results. Contaminating noise degrades performance for both the traditional and PAGE methods and causes probe microphone pairs to exhib
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Zhang, Xue Xia, Zhi Xin Hu, Wen Bin Zhao, and Chan Li. "The Static Stress Intensity Factor around the Anti-Plane Crack in an Orthotropic Functionally Graded Material." Applied Mechanics and Materials 275-277 (January 2013): 208–14. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.208.

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The problem of anti-plane crack in infinity orthotropic functionally graded materials is studied by using of integral transforms-dual integral equations. The shear modulus in the two principal directions of the functionally graded material was assumed to vary proportionately as gradient model of double parameters. And the variation curves of the dimensionless stress intensity factor with the orthogonal parameter and the crack length have been obtained by using the mathematical software .The results shows that stress intensity factor increases with the increasing of and a. It means that stress
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Zhang, Jie, Wei Liu, and Shuyuan Zhang. "Understanding the Luminescence Characteristics of Ultraviolet InGaN/AlGaN Multiple Quantum Wells with Different In Gradients." Crystals 11, no. 11 (2021): 1390. http://dx.doi.org/10.3390/cryst11111390.

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The electroluminescence (EL) properties of InGaN/AlGaN ultraviolet light-emitting multiple quantum wells (MQWs) with identical average In content but different In gradients (In content increases linearly, along the growth direction) are investigated numerically. It is found that the luminescence efficiency is improved, and the EL spectral peak wavelength becomes longer for the MQW sample with a larger In gradient. Since the influence of In gradient is different for the conduction and valence bands in InGaN layers, the distribution of electrons and holes in QWs may be changed, leading to a reds
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Li, Meng, and Yi Zhan. "Integrating Feature Direction Information with a Level Set Formulation for Image Segmentation." East Asian Journal on Applied Mathematics 6, no. 1 (2016): 1–22. http://dx.doi.org/10.4208/eajam.231114.240915a.

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AbstractA feature-dependent variational level set formulation is proposed for image segmentation. Two second order directional derivatives act as the external constraint in the level set evolution, with the directional derivative across the image features direction playing a key role in contour extraction and another only slightly contributes. To overcome the local gradient limit, we integrate the information from the maximal (in magnitude) second-order directional derivative into a common variational framework. It naturally encourages the level set function to deform (up or down) in opposite
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Dissertations / Theses on the topic "Intensity gradient direction"

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Lawrence, Joseph Scott. "Use of Phase and Amplitude Gradient Estimation for Acoustic Source Characterization and Localization." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6969.

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Energy-based acoustic quantities provide vital information about acoustic fields and the characterization of acoustic sources. Recently, the phase and amplitude gradient estimator (PAGE) method has been developed to reduce error and extend bandwidth of energy-based quantity estimates. To inform uses and applications of the method, analytical and experimental characterizations of the method are presented. Analytical PAGE method bias errors are compared with those of traditional estimation for two- and three-microphone one-dimensional probes. For a monopole field when phase unwrapping is possibl
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Book chapters on the topic "Intensity gradient direction"

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Ifenthaler, Dirk. "Automated Essay Scoring Systems." In Handbook of Open, Distance and Digital Education. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-2080-6_59.

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AbstractEssays are scholarly compositions with a specific focus on a phenomenon in question. They provide learners the opportunity to demonstrate in-depth understanding of a subject matter; however, evaluating, grading, and providing feedback on written essays are time consuming and labor intensive. Advances in automated assessment systems may facilitate the feasibility, objectivity, reliability, and validity of the evaluation of written prose as well as providing instant feedback during learning processes. Measurements of written text include observable components such as content, style, orga
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Ifenthaler, Dirk. "Automated Essay Scoring Systems." In Handbook of Open, Distance and Digital Education. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0351-9_59-1.

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AbstractEssays are scholarly compositions with a specific focus on a phenomenon in question. They provide learners the opportunity to demonstrate in-depth understanding of a subject matter; however, evaluating, grading, and providing feedback on written essays are time consuming and labor intensive. Advances in automated assessment systems may facilitate the feasibility, objectivity, reliability, and validity of the evaluation of written prose as well as providing instant feedback during learning processes. Measurements of written text include observable components such as content, style, orga
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Bernal Jorge, Sánchez Javier, and Vilariño Fernando. "Depth of Valleys Accumulation Algorithm for Object Detection." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2011. https://doi.org/10.3233/978-1-60750-842-7-71.

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This work aims at detecting in which regions the objects in the image are by using information about the intensity of valleys, which appear to surround objects in images where the source of light is in the line of direction than the camera. We present our depth of valleys accumulation method, which consists of two stages: first, the definition of the depth of valleys image which combines the output of a ridges and valleys detector with the morphological gradient to measure how deep is a point inside a valley and second, an algorithm that denotes points of the image as interior to objects those
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Hoyt, Douglas V., and Kenneth H. Shatten. "Storms." In The Role of the Sun in Climate Change. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195094138.003.0011.

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We now examine some attempts to link storm numbers and storm track locations to solar activity. The number of both tropical cyclones and thunderstorms has increased and decreased with time and location as a function of solar activity. In fact, an early correlation between the number of Indian cyclones and solar activity proved so startling it caused an explosion of related research. In the previous century, tropical cyclones were called hurricanes or typhoons. Today tropical cyclones refer only to the weaker tropical storms with sustained winds above 31 miles per hour. Here, tropical cyclones
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Conference papers on the topic "Intensity gradient direction"

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Das Gupta, Rahul, Jatindra Kumar Dash, and Sudipta Mukhopadhyay. "Content based retrieval of interstitial lung disease patterns using spatial distribution of intensity, gradient magnitude and gradient direction." In 2016 International Conference on Systems in Medicine and Biology (ICSMB). IEEE, 2016. http://dx.doi.org/10.1109/icsmb.2016.7915087.

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Guo, Tongcui, Guihai Wang, Xinmin Song, et al. "Application of Wide-Azimuth Anisotropy Inversion Predicting Carbonate Fracture Intensity and Direction." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207651-ms.

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Abstract Fractures in carbonate rock are both storing reservoirs and migrating channels for oil and gas, so such fractures are one of the key targets for oil exploration and development. Traditional fracture prediction methods by seismic data include ant tracking cube, coherence cube and other seismic attributes. Fractures predicted by these methods are less accurate. This paper introduces a wide-azimuth anisotropic inversion method to effectively predict the fracture density and direction in carbonates. a wide-azimuth seismic anisotropy inversion workflow is established to predict the fractur
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Smith, Sandra L., and Richard L. Fork. "Beam deflection utilizing an induced gradient-index Kerr lens." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thmm21.

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A physical mechanism by which one optical pulse can redirect a second optical pulse within a densely packed array geometry is an important component for parallel optical processing systems. We computationally model such a mechanism through the action of a strong pump pulse on a weaker signal pulse as they copropagate through a nonlinear medium. By shaping the pump pulse to have a spatial intensity profile that varies transverse to the direction of propagation, we induce the desired effect. Proper design of the spatial intensity gradient can, via the optical Kerr effect, create a transient grad
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Colac¸o, Marcelo J., George S. Dulikravich, and Thomas J. Martin. "Reducing Convection Effects in Solidification by Applying Magnetic Fields Having Optimized Intensity Distribution." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47308.

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This paper presents a numerical procedure for achieving desired features of a melt undergoing solidification by applying an external magnetic field whose intensity and spatial distribution are obtained by the use of a hybrid optimization algorithm. The intensities of the magnets along the boundaries of the container are described as B-splines. The inverse problem is then formulated as to find the magnetic boundary conditions (the coefficients of the B-splines) in such a way that the gradients of temperature along the gravity direction are minimized. For this task, a hybrid optimization code wa
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Wang, C., and D. L. Shealy. "A gradient-index lens system for laser beam reshaping." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.ww1.

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Gradient-index (GRIN) lenses with spherical surfaces are able to yield the equivalent aspherical effects. A refractive system that consists of one plano-concave lens and one convex-piano lens using axial gradient-index materials has been designed to transform a Gaussian beam profile into a uniform intensity distribution. The GRIN distribution in the axial direction and the vertex curvatures of two spherical surfaces are determined by using the energy conservation condition and the condition of constant optical path length, which permits an exiting plane wave. The design and analysis of this gr
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Ihara, Tadayoshi, Xiaojian Qin, Takafumi Tanaka, and Kazunori Wakai. "Auto Ignition and Knocking Phenomena in Stratified Mixture of Lean Condition." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32736.

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Experimental study has been conducted on auto ignition and knocking phenomena of stratified mixture using a rapid compression machine (RCM) in order to investigate the effects of fuel concentration gradient on the auto ignition and combustion characteristics in the condition that mean equivalence ratio is lean. N-heptane is used as a fuel and mean equivalence ratio is 0.6, 0.8 and 1.0 in the combustion chamber. In the chamber, the lower the vertical location is, the richer the concentration of the mixture is. The difference of the equivalence ratio from bottom to top in the chamber is varied f
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Nsofor, Emmanuel C., and Xudong Wang. "Oscillatory Heat Transfer at the Heat Exchangers of the Thermoacoustic Refrigeration System." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41306.

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Thermoacoustic refrigeration systems utilize high intensity sound waves and the interactions with solid boundaries to create temperature gradient, heat pumping and consequent cooling. In this study, a thermoacoustic refrigeration system was designed and constructed. The stack was fabricated from a thermoplastic material to reduce conduction in the direction opposite to heat pumping. The direction of the stack plates perpendicular to the thickness was lined with an aluminum material to increase the heat transfer in this direction. A study on the oscillatory flow heat transfer at the heat exchan
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Kamaya, Masayuki. "Crack Growth Under Thermal Fatigue Loading (Effect of Stress Gradient and Relaxation)." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77547.

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Thermal fatigue is a critical problem in nuclear power plants. To prevent crack initiation, JSME has issued a guideline for design. In this study, the feasibility of incorporating crack growth analysis into the design and integrity evaluation was investigated. Two characteristics of thermal fatigue loading were considered. The first was the effects of stress gradient in the depth direction. It was shown that the steep stress gradient near the surface significantly reduced the stress intensity factor (SIF) of deep cracks. Assuming that crack growth is arrested by small SIF, it is possible to le
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Schobeiri, M. T., and R. E. Radke. "Effects of Periodic Unsteady Wake Flow and Pressure Gradient on Boundary Layer Transition Along the Concave Surface of a Curved Plate." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-327.

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Boundary layer transition and development on a turbomachinery blade is subjected to highly periodic unsteady turbulent flow, pressure gradient in longitudinal as well as lateral direction, and surface curvature. To study the effects of periodic unsteady wakes on the concave surface of a turbine blade, a curved plate was utilized. On the concave surface of this plate, detailed experimental investigations were carried out under zero and negative pressure gradient. The measurements were performed on an unsteady flow research facility using a rotating cascade of rods positioned upstream of the cur
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Wang, Z. H., S. Yang, and H. Chen. "Magnetic Field Effect on the Natural Convection of a Liquid Metal in a Horizontal Cylinder." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16349.

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Magneto-hydrodynamic (MHD) effects are widely exploited in different industrial processes. MHD play an essential role in nuclear fusion, where it is involved in the behavior of the liquid metal alloys employed in some of the currently considered designs of tritium breeding blankets. Results of numerical simulations are presented for the natural convection of a liquid metal placed in a horizontal cylinder in the presence of a vertical magnetic field. When there is an additional magnetic field, an induced current is produced by the movement of the liquid metal in a magnetic field. Induced curren
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