20 results on '"vectorial"'
Search Results
2. Regularity for local minima of a special class of vectorial problems with fully anisotropic growth.
- Author
-
Granucci, Tiziano and Randolfi, Monia
- Abstract
In this paper we establish boundedness and continuity results for vectorial local minimizers of special classes of integral functionals. In particular we consider a class of vectorial problems in which the energy density satisfies fully anisotropic growth. We analyze two different types of anisotropic growths connected with the Orlicz Sobolev spaces. We prove boundedness results for energy densities satisfying anisotropic growth, moreover for particular energy densities we get Hölder continuity results by proving that each component belongs to a suitable De Giorgi class. Finally, we provide specific non-trivial instances of our results. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Exploring fundamental physics with gravitational waves
- Author
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Mihaylov, Deyan Petrov, Gilmore, Gerard Francis, Lasenby, Anthony, and Gair, Jonathan
- Subjects
gravity ,gravitational waves ,wave ,physics ,fundamental physics ,Gaia ,astrometry ,star ,galaxy ,Milky Way ,observatory ,Bayesian ,inference ,frequency ,spectrum ,sensitivity ,black hole ,binary ,supermassive black hole ,orbit ,inspiral ,light year ,correlation ,cross-correlation ,overlap reduction function ,correlation curve ,LIGO ,LISA ,astrometric response ,background ,tensorial ,scalar ,vectorial ,longitudinal ,polarisation ,resonance ,EMRI ,extreme mass-ratio inspiral ,self-force ,differential equation ,non-linear ,phase ,deflection ,Kerr ,Schwarzschild ,geodesic ,integral - Abstract
In this dissertation I explore several topics in the field of gravitational wave astronomy. By means of introduction, I review the historical evolution of humanity's understanding of the mechanics of gravity, and the events which eventually led to the first ever detection of gravitational waves in 2015. The first half of the thesis is dedicated to the effect which gravitational waves have on the apparent position of stars on the sky. The astrometric shift caused by a gravitational wave signal can be quantified, and precise astrometric measurements (from Gaia) can provide a new method for searching for low-frequency GWs. This method is applied to searches for signals from individually resolvable supermassive black hole binaries. The main obstacle to performing efficient searches is the large size of the data sets, which consist of more than one billion stars. A near-lossless compression which reduces the size of the data set by a factor of 10⁶ is discussed and implemented. Mock data sets are generated to simulate detections of gravitational waves using this method, and the frequency and directional sensitivities of the full-term Gaia mission are calculated. Parallels are drawn with the field of pulsar timing searches for GWs. This knowledge of the astrometric response is used to address the problem of searching for low frequency gravitational wave backgrounds using astrometric measurements. The astrometric deflections due to a stochastic GW background form a correlated vector field on the sphere (sky). Using a convenient decomposition of the correlation matrix, the 2-point correlation functions are calculated and compared to the redshift correlation in pulsar timing literature (and the Hellings-Downs curve). The correlation between redshift and astrometric deflections is also considered. The second part of the dissertation focuses on the problem of resonances in extreme mass-ratio in-spirals (EMRIs). These events are prime candidates for GW detection in the millihertz band (by detectors like LISA), and involve a stellar mass black hole (or a similar compact object) merging with a supermassive black hole. Properties of the trajectory of the lighter body are well known, however little is known about the behaviour of such systems during resonance of the radial and polar motions. Two existing models for this behaviour are described: the instantaneous frequency approach (developed by Gair, Bender, and Yunes) and the two timescales approach (proposed by Flanagan and Hinderer). Both methods depend on exact treatment of the gravitational self-force, which is currently not available. The results of Gair, Bender, and Yunes are extended to higher-order in the on-resonance flux modification, and the instantaneous frequency approach is confirmed to be a valid treatment of this problem. The algorithm for finding higher-order solutions is described, and further directions for extending this research are proposed.
- Published
- 2019
- Full Text
- View/download PDF
4. Everywhere Hölder continuity of vectorial local minimizers of special classes of integral functionals with rank one integrands.
- Author
-
Granucci, Tiziano
- Abstract
In this paper we study the everywhere Hölder continuity of the minima of the following class of vectorial integral functionals ∫ Ω ∑ α = 1 n f α x , u α , ∇ u α + G x , u , ∇ u d x The energy densities satisfy suitable structure assumptions and may have neither radial nor quasi-diagonal structure. The regularity of minimizers is obtained by proving that each component stays in a suitable De Giorgi class and, from this, we conclude about the Hölder continuity. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
5. On the Hölder continuity for a class of vectorial problems
- Author
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Cupini Giovanni, Focardi Matteo, Leonetti Francesco, and Mascolo Elvira
- Subjects
holder ,continuity ,regularity ,vectorial ,minimizer ,variational ,integral ,primary: 49n60 ,secondary: 35j50 ,Analysis ,QA299.6-433 - Abstract
In this paper we prove local Hölder continuity of vectorial local minimizers of special classes of integral functionals with rank-one and polyconvex integrands. The energy densities satisfy suitable structure assumptions and may have neither radial nor quasi-diagonal structure. The regularity of minimizers is obtained by proving that each component stays in a suitable De Giorgi class and, from this, we conclude about the Hölder continuity. In the final section, we provide some non-trivial applications of our results.
- Published
- 2019
- Full Text
- View/download PDF
6. Vectorial facial sculpting: A novel sub‐SMAS filler injection technique to reverse the impact of the attenuated retaining ligaments.
- Author
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Cohen, Sarit, Artzi, Ofir, Mehrabi, Joseph N., and Heller, Lior
- Subjects
- *
LIGAMENTS , *REJUVENATION , *SCULPTURE , *FILLER materials , *INJECTIONS , *ORBITAL diseases - Abstract
Background: Age‐related attenuation of the orbital, zygomatic, and masseteric ligaments contribute to temporal brow ptosis, deepening nasolabial fold, and jowl, respectively. Aims: To present and assess the vectorial facial sculpting (VFS) technique, a novel nonsurgical panfacial rejuvenation method which focuses on reversal of the impact of attenuated ligaments on the aging face. Methods: This case series included women who underwent vectorial facial sculpting at a private clinic from June 2018 to January 2019. Sagging tissues in the lateral brow, nasolabial fold, and jowl were repositioned in a directed manner with vectors whose cross‐product counteracted the vector of the respective causative attenuated ligament. Filler material was deposited into the supraperiosteal/sub‐SMAS plane in right angle vectors at the lateral supra‐orbital rim for brow ptosis, pre‐auricular and malar region for nasolabial fold and across the jawline region for jowl. Standardized photographs were taken before and at 3 months following treatment. Outcome was assessed by both the patients and an independent investigator using a validated Global Aesthetic Improvement Scale. Adverse outcomes were documented. Results: Forty‐five patients of mean age 59.8 ± 3.9 years were included. Mean Global Aesthetic Improvement Scale scores for patients and an independent investigator alike at 3 months following treatment indicated "very much improved" (1.44 ± 0.66 and 1.56 ± 0.78, respectively). The procedure was well tolerated with no adverse events. Conclusion: Vectorial facial sculpting is a comprehensive anatomical approach for nonsurgical directional tissue mobilization. Based on physical and mathematical rules to reverse the respective causative attenuated ligament, the technique effectively and safely restores youthful facial contours. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
7. CARTOGRAPHICAL ALGORITHM OF EFFICIENT CULLING OF VECTORIAL OBJECTS.
- Author
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I. Alekseichuk and A. Vejtsblit
- Subjects
algorithm ,efficiency ,GIS ,vectorial ,visualization ,Education - Abstract
Algorithm, presented in the article, demonstrates an effective model of processing of vectorial objects in GIS, in particular visualization
- Published
- 2010
8. DEVELOPING A MATHEMATICAL MODEL FOR THE PROCESS OF DEVELOPING A MATHEMATICAL MODEL FOR THE PROCESS OF SEDIMENTARY TANKS
- Author
-
Valeria Victoria IOVANOV
- Subjects
matrix ,vectorial ,differential ,non-convex ,Technology ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
The model is reformulated by means of stochastic differential equations, and the parametersare estimated by a maximum likelihood method.VESILIND (1968; 1979) proposed a sludge settling velocity model of exponential form. During recent years,several refinements to the original model have been proposed, see e.g. GRIJSPEERDT et al. (1995); DUPONTand DAHL (1995) EKAMA et al. (1997). In the proposed models several layers in the settling tank areincorporated to permit the calculation of SS profiles over the tank depth and predict the SS concentrations in thereturn sludge and in the effluent from the clarifier.Here, the original VESILIND model combined with a simple suction depth model is used to enable predictionof the SS concentration in the effluent from the tank. In order to make the model applicable for real time controlpurposes, only two layers of variable height in the tank are considered
- Published
- 2013
9. ARGUMENT.
- Author
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PASAT, Alexandru
- Subjects
ART history ,ARTISTIC creation ,IMAGINATION ,DRAWING ability ,21ST century art ,FORM (Aesthetics) - Abstract
Scientific argumentation of the permanent reversion into the synthesizing tendency, to purification and simplification of the plastic – sculptural form, along the history of the art. The privilege of the form to periodically gain its freedom by the creative imagination of the artist, by the need to give always a new plastic sense to the "line of the absolute return", either on own account, or in the name of a new aesthetics, crossing over parallel worlds in the eagerness to become elementary and simple. [ABSTRACT FROM AUTHOR]
- Published
- 2011
10. TNF-α induces vectorial secretion of IL-8 in Caco-2 cells.
- Author
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Sonnier, Dennis I., Bailey, Stephanie R., Schuster, Rebecca M., Lentsch, Alex B., and Pritts, Timothy A.
- Subjects
- *
CELLS , *TUMOR necrosis factor receptors , *INTERLEUKIN-8 , *EPITHELIAL cells , *INTESTINES , *IMMUNITY , *INFLAMMATION - Abstract
Introduction: Intestinal epithelial cells represent an important component of innate immunity, with sophisticated responses to inflammatory stimuli. The manner in which intestinal epithelial cell polarity affects responses to inflammatory stimuli is largely unknown. We hypothesized that polarized intestinal epithelial cells exhibit a bidirectional inflammatory response dependent upon the location of the stimulus.Methods: Caco-2 cells were grown on semi-permeable inserts in a dual-compartment culture system and treated with tumor necrosis factor-α (TNF-α; 100 ng/ml) or serum-free media in the apical or basolateral chamber. Interleukin-8 (IL-8) production in each chamber was measured by enzyme-linked immunosorbent assay. To determine receptor specificity, anti-TNF receptor antibodies were added to the apical or basolateral chamber.Results: Basolateral stimulation with TNF-α resulted in increased apical and basolateral IL-8 production. Apical TNF-α stimulation resulted in increased apical, but not basolateral IL-8 production. Receptor blockade suggested TNF receptor 1 involvement on both apical and basolateral membranes, while TNF receptor 2 was only active on the apical membrane.Conclusion: Polarized intestinal epithelial cells respond to TNF-α stimulation with focused, directional secretion of the proinflammatory cytokine IL-8. These findings are important because they suggest that intestinal epithelial cells are capable of organizing their response to inflammatory signals and producing inflammatory mediators in a bidirectional, vectorial fashion. [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF
11. Propagation properties of vectorial Hermite-cosine-Gaussian beams beyond the paraxial approximation.
- Author
-
Bin Tang and Meiping Jiang
- Subjects
- *
OPTICS , *GAUSSIAN beams , *FREE space optical interconnects , *OPTICAL diffraction , *INTEGRALS , *MATHEMATICAL models , *NUMERICAL analysis , *APPROXIMATION theory - Abstract
Starting from the vectorial Rayleigh-Sommerfeld diffraction integrals, the analytical propagation expressions of vectorial nonparaxial Hermite-cosine-Gaussian (HCosG) beams in free space are derived. The on-axis intensity, far-field equation and, in particular, paraxial expressions are given and treated as special cases of our result. It is shown that for vectorial nonparaxial HCosG beams, the parameter f = 1/kw0, with k being the wave number and w0 being the waist width, determines their nonparaxiality. What is more, the decentered parameter also affects their intensity distribution and nonparaxial behavior. The calculation results indicate that the position of maximum on-axis intensity changes with the mode indices. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
12. Tight junctions and apical/basolateral polarity.
- Author
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Cereijido, Marcelino, Ponce, Arturo, and Gonzalez-Mariscal, Lorenza
- Abstract
Physiological studies led to devise models of epithelial cells in which the membrane does not have its molecules distributed homogeneously, but polarized towards the apical or towards the basolateral regions. For a while, it was assumed that the TJ, acting as a fence between the two regions, would be responsible for this asymmetry. However, today the information available indicates not only that polarization may proceed independently of the TJ, but that this structure itself may attain its precise location due to a polarization process. Nevertheless, TJs may play a role in restricting to the apical or to the basolateral region those molecules that are free to diffuse in the plane of the cell membrane (e.g., lipids and protein that are not attached to cytoplasmic or extracellular structures). [ABSTRACT FROM AUTHOR]
- Published
- 1989
- Full Text
- View/download PDF
13. End-to-End Learning of Polygons for Remote Sensing Image Classification
- Author
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Nicolas Girard, Yuliya Tarabalka, Geometric Modeling of 3D Environments (TITANE), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), and Girard, Nicolas
- Subjects
[INFO.INFO-AI] Computer Science [cs]/Artificial Intelligence [cs.AI] ,Geographic information system ,Computer science ,Feature extraction ,0211 other engineering and technologies ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Image (mathematics) ,[INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI] ,[INFO.INFO-CV] Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV] ,[INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG] ,convolutional neural networks ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences ,Remote sensing ,Contextual image classification ,business.industry ,deep learning ,[INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV] ,[INFO.INFO-LG] Computer Science [cs]/Machine Learning [cs.LG] ,vectorial ,Vertex (geometry) ,polygon ,[INFO.INFO-TI] Computer Science [cs]/Image Processing [eess.IV] ,[INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV] ,Polygon ,regression ,business ,Index Terms— High-resolution aerial images - Abstract
International audience; While geographic information systems typically use polygonal representations to map Earth's objects, most state-of-the-art methods produce maps by performing pixelwise classification of remote sensing images, then vectorizing the outputs. This paper studies if one can learn to directly output a vectorial semantic labeling of the image. We here cast a mapping problem as a polygon prediction task, and propose a deep learning approach which predicts vertices of the polygons outlining objects of interest. Experimental results on the Solar photovoltaic array location dataset show that the proposed network succeeds in learning to regress polygon coordinates, yielding directly vectorial map outputs.
- Published
- 2018
14. Obstacle-avoiding navigation system
- Author
-
Levine, Simon [Ann Arbor, MI]
- Published
- 1991
15. CARTOGRAPHICAL ALGORITHM OF EFFICIENT CULLING OF VECTORIAL OBJECTS
- Author
-
A. Vejtsblit and I. Alekseichuk
- Subjects
algorithm ,Computer science ,efficiency ,Culling ,vectorial ,GIS ,lcsh:L ,Algorithm ,visualization ,lcsh:Education - Abstract
Algorithm, presented in the article, demonstrates an effective model of processing of vectorial objects in GIS, in particular visualization
- Published
- 2010
16. An Anisotropic Bimodal Energy for detection of thin tubes and its approximation with Γ-convergence
- Author
-
Vicente, David, Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), and Vicente, David
- Subjects
\Gamma-convergence ,local metric ,thin tubes detection ,MSC 49J45 ,[MATH.MATH-OC] Mathematics [math]/Optimization and Control [math.OC] ,vectorial ,[MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC] ,anisotropic - Abstract
This work is a contribution to the problem of detection of thin struc- tures, namely tubes, in a 2D or 3D image. We introduce a bimodal model for the case where the histogram of the image has two main modes. This model involves an energy functional depending on a function and a rie- mannian metric. One of the term of this energy is the anisotropic perime- ter associated to the dual metric. We perform an approximation of this functional and prove it Γ-converges to the original one.
- Published
- 2014
17. General imaging of advanced 3D mask objects based on the fully-vectorial Extended Nijboer-Zernike (ENZ) theory
- Subjects
mask topography effects ,FDTD ,non-periodic objects ,vectorial ,mask imaging ,Extended Nijboer-Zernike (EZN) ,Abbe method - Abstract
In this paper we introduce a new mask imaging algorithm that is based on the source point integration method (or Abbe method). The method presented here distinguishes itself from existing methods by exploiting the through-focus imaging feature of the Extended Nijboer-Zernike (ENZ) theory of diffraction. An introduction to ENZ-theory and its application in general imaging is provided after which we describe the mask imaging scheme that can be derived from it. The remainder of the paper is devoted to illustrating the advantages of the new method over existing methods (Hopkins-based). To this extent several simulation results are included that illustrate advantages arising from: the accurate incorporation of isolated structures, the rigorous treatment of the object (mask topography) and the fully vectorial through-focus image formation of the ENZ-based algorithm.
- Published
- 2008
18. General imaging of advanced 3D mask objects based on the fully-vectorial Extended Nijboer-Zernike (ENZ) theory
- Author
-
H. Paul Urbach, Joseph J. M. Braat, O.T.A. Janssen, Augustus J. E. M. Janssen, Silvania F. Pereira, Sven van Haver, and Control Systems
- Subjects
Diffraction ,Image formation ,business.industry ,Computer science ,Zernike polynomials ,FDTD ,Finite-difference time-domain method ,vectorial ,Object (computer science) ,Abbe method ,law.invention ,mask topography effects ,symbols.namesake ,law ,symbols ,non-periodic objects ,Point (geometry) ,Computer vision ,Artificial intelligence ,Photolithography ,Remainder ,mask imaging ,Extended Nijboer-Zernike (EZN) ,business - Abstract
In this paper we introduce a new mask imaging algorithm that is based on the source point integration method (or Abbe method). The method presented here distinguishes itself from existing methods by exploiting the through-focus imaging feature of the Extended Nijboer-Zernike (ENZ) theory of diffraction. An introduction to ENZ-theory and its application in general imaging is provided after which we describe the mask imaging scheme that can be derived from it. The remainder of the paper is devoted to illustrating the advantages of the new method over existing methods (Hopkins-based). To this extent several simulation results are included that illustrate advantages arising from: the accurate incorporation of isolated structures, the rigorous treatment of the object (mask topography) and the fully vectorial through-focus image formation of the ENZ-based algorithm.
- Published
- 2008
19. DEVELOPING A MATHEMATICAL MODEL FOR THE PROCESS OF PURIFYING INDUSTRIAL RESIDUAL WATERS IN THE SEDIMENTARY TANKS.
- Author
-
IOVANOV, Valeria Victoria
- Subjects
- *
MATHEMATICS , *MATHEMATICAL models , *DIFFERENTIAL equations , *STOCHASTIC differential equations , *BESSEL functions - Abstract
The model is reformulated by means of stochastic differential equations, and the parameters are estimated by a maximum likelihood method. VESILIND (1968; 1979) proposed a sludge settling velocity model of exponential form. During recent years, several refinements to the original model have been proposed, see e.g. GRIJSPEERDT et al. (1995); DUPONT and DAHL (1995) EKAMA et al. (1997). In the proposed models several layers in the settling tank are incorporated to permit the calculation of SS profiles over the tank depth and predict the SS concentrations in the return sludge and in the effluent from the clarifier. Here, the original VESILIND model combined with a simple suction depth model is used to enable prediction of the SS concentration in the effluent from the tank. In order to make the model applicable for real time control purposes, only two layers of variable height in the tank are considered. [ABSTRACT FROM AUTHOR]
- Published
- 2013
20. Autotransporters: The Cellular Environment Reshapes a Folding Mechanism to Promote Protein Transport.
- Author
-
Braselmann E and Clark PL
- Abstract
We know very little about how the cellular environment affects protein folding mechanisms. Here, we focus on one unique aspect of that environment that is difficult to recapitulate in the test tube: the effect of a folding vector. When protein folding is initiated at one end of the polypeptide chain, folding starts from a much smaller ensemble of conformations than during refolding of a full-length polypeptide chain. But to what extent can vectorial folding affect protein folding kinetics and the conformations of folding intermediates? We focus on recent studies of autotransporter proteins, the largest class of virulence proteins from pathogenic Gram-negative bacteria. Autotransporter proteins are secreted across the bacterial inner membrane from N→C-terminus, which, like refolding in vitro , retards folding. But in contrast, upon C→N-terminal secretion across the outer membrane autotransporter folding proceeds orders of magnitude faster. The potential impact of vectorial folding on the folding mechanisms of other proteins is also discussed.
- Published
- 2012
- Full Text
- View/download PDF
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