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Littérature scientifique sur le sujet « ENHANCED CORRELATION »

Auteur : Grafiati

Publié le 16 janvier 2024

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Articles de revues sur le sujet "ENHANCED CORRELATION"

Xie, Boya, et Sheng Feng. « Heterodyne detection enhanced by quantum correlation ». Chinese Optics Letters 19, n^o 7 (2021) : 072701. http://dx.doi.org/10.3788/col202119.072701.

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Sanchis, Charlotte, et Alfred Hanssen. « Enhanced local correlation stacking method ». GEOPHYSICS 76, n^o 3 (mai 2011) : V33—V45. http://dx.doi.org/10.1190/1.3552687.

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Stacking is a common technique to improve the signal-to-noise ratio (S/N) and the imaging quality of seismic data. Conventional stacking that averages equally a collection of normal moveout corrected or migrated shot gathers with a common reflection point is not always satisfactory. Instead, we propose a novel time-dependent weighted average stacking method that utilizes local correlation between each individual trace and a chosen reference trace as a measure of weight and a new weight normalization scheme that ensures meaningful amplitudes of the output. Three different reference traces have been proposed. These are based on conventional stacking, S/N estimation, and Kalman filtering. The outputs of the enhanced stacking methods, as well as their reference traces, were compared on both synthetic data and real marine migrated subsalt data. We conclude that both S/N estimation and Kalman reference stacking methods as well as the output of the enhanced stacking method yield consistently better results than conventional stacking. They exhibit cleaner and better defined reflection events and a larger number of reflections. We found that the Kalman reference method produces the best overall seismic image contrast and reveals many more reflected events, but at the cost of a higher noise level and a longer processing time. Thus, enhanced stacking using S/N estimation as reference method is a possible alternative that has the advantages of running faster, but also emphasizes some reflected events under the subsalt structure.

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Alam, M. S., et M. A. Karim. « Enhanced correlation discrimination using binary joint transform correlation with feedback ». Microwave and Optical Technology Letters 5, n^o 14 (20 décembre 1992) : 752–57. http://dx.doi.org/10.1002/mop.4650051415.

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Wang, Hongfei, et Kun He. « Sub‐population prediction using enhanced correlation filters ». Electronics Letters 54, n^o 13 (juin 2018) : 831–33. http://dx.doi.org/10.1049/el.2018.0338.

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Jian, Muwei, Yue Jin et Hui Yu. « Enhanced Temporal Correlation for Universal Lesion Detection ». Computer Modeling in Engineering & ; Sciences 138, n^o 3 (2024) : 3051–63. http://dx.doi.org/10.32604/cmes.2023.030236.

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Zeng, Chunhua, Tao Yang, Qinglin Han, Chun Zhang, Dong Tian et Hua Wang. « Noises-induced toggle switch and stability in a gene regulation network ». International Journal of Modern Physics B 28, n^o 31 (8 décembre 2014) : 1450223. http://dx.doi.org/10.1142/s0217979214502233.

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It is well-known that noises are inevitable in gene regulatory networks due to the low-copy numbers of molecules and environmental fluctuations. In this paper, we investigate the stationary probability distribution (SPD) between both low (OFF state) and high (ON state) protein levels and mean first passage time (MFPT) in an abstract model of the Myc/E2F/miR-17-92 network presented by Aguda et al., PNAS 105, 19678 (2008), where the gene expression is assumed to be disturbed simultaneously by intrinsic and extrinsic noises that were correlated. Our results show that (i) the OFF state is enhanced by the extrinsic noise (D), while the ON state is enhanced by the intrinsic noise (Q) or cross-correlation between two noises (λ); (ii) for the cases of negative or no cross-correlation (λ⩽0.0), the increase of the noise intensity (D or Q) leads to a decline of the MFPT and enhances the probability of toggle switch to the OFF state; (iii) but for the case of positive cross-correlation (λ>0.0), the MFPT as a function of the noise intensity (D or Q) exhibits a maximum, this maximum for MFPT identifies the characteristic of noise enhanced stability of the ON state and (iv) the cross-correlation between two noises can enhance stability of the ON state.

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Amirruddin, Melaty, Mohd Rafi Adzman, Nur Adyani Mohd Affendi, Muhd Hafizi Idris et Syahirah Abd Halim. « Arcing fault diagnosis using enhanced cross-correlation technique ». Journal of Physics : Conference Series 2312, n^o 1 (1 août 2022) : 012066. http://dx.doi.org/10.1088/1742-6596/2312/1/012066.

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Abstract This study explored the potential use of cross-correlation as a technique for detecting arcing faults in a power system distribution network. The cross-correlation technique was employed to investigate the effect of each antenna placement as a detection device, time difference of arrival (TDOA), time delay, and correlation magnitude of arcing signals detected during on-line arcing fault measurement. The arcing fault was detected using four antennas that had been set up around the arc source point in a high voltage (HV) laboratory. The measurements were taken using a digital oscilloscope. For precise results, the Discrete Wavelet Transform (DWT) denoising technique combined with cross-correlation (CC) technique were applied using MATLAB software to identify the arcing signals detected in order to diagnose the differentiation between noisy and real arcing fault signals. Further assessment was carried out by performing a cross-correlation technique on the real arcing signals obtained to find the similarities and arrival time’s delay between single arcing signals’ placement. The outcome shows that all measurements including the time difference of arrival (TDOA), correlation magnitude, time delay, and antennas’ placement towards the arcing source point are valuable in determining the arcing signals detected precisely.

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Ma, Hong-Mei, Li-Qing Chen et Chun-Hua Yuan. « Cascade correlation-enhanced Raman scattering in atomic vapors ». Chinese Physics B 25, n^o 12 (29 novembre 2016) : 124206. http://dx.doi.org/10.1088/1674-1056/25/12/124206.

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Evangelidis, G. D., et E. Z. Psarakis. « Parametric Image Alignment Using Enhanced Correlation Coefficient Maximization ». IEEE Transactions on Pattern Analysis and Machine Intelligence 30, n^o 10 (octobre 2008) : 1858–65. http://dx.doi.org/10.1109/tpami.2008.113.

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Langguth, Lutz, et A. Femius Koenderink. « Simple model for plasmon enhanced fluorescence correlation spectroscopy ». Optics Express 22, n^o 13 (17 juin 2014) : 15397. http://dx.doi.org/10.1364/oe.22.015397.

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Thèses sur le sujet "ENHANCED CORRELATION"

Das, Shamiparna. « Microstructure for Enhanced Plasticity and Toughness ». Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc862825/.

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Magnesium is the lightest metal with a very high specific strength. However, its practical applicability is limited by its toughness and reliability. Mg, being HCP has low ductility. This makes the improvement of toughness a grand challenge in Mg alloys. Friction stir processing (FSP) is a thermomechanical technique used to effect microstructural modification. Here, FSP was utilized to affect the toughness of WE43 sheets through microstructural modification. Room temperature Kahn-type tests were conducted to measure the toughness of WE43 sheets. Microscopic techniques (SEM, TEM) was utilized to study the effect of various microstructural factors like grain size, texture, constituent particles, precipitates on crack initiation and propagation. Tensile properties were evaluated by mini-tensile tests. Crack growth in WE43 sheets was also affected by mechanics and digital image correlation (DIC) was utilized to study the plastic zone size. The underlying mechanisms affecting toughness of these sheets were understood which will help in formulating ways in improving it. WE43 nanocomposites were fabricated via FSP. Uniform distribution of reinforcements was obtained in the composites. Improved mechanical properties like that of enhanced strength, increased hardness and stiffness were obtained. But contrary to other metal matrix composites which show reduction in ductility with incorporation of ceramic reinforcements, the nanocomposites showed good strength-ductility combination. The composites were precisely characterized and mechanisms governing this property were studied. The nano-length of the reinforcements was observed to be the main criteria and the dislocation-particle interaction, the main reason behind the strength-ductility property.

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Al, Kharusi Laiyyan Mohammed. « Correlation between High Resolution Sequence Stratigraphy and Mechanical Stratigraphy for Enhanced Fracture Characteristic Prediction ». Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/339.

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Sequence stratigraphy relates changes in vertical and lateral facies distribution to relative changes in sea level. These relative changes in carbonates effect early diagenesis, types of pores, cementation and dissolution patterns. As a result, in carbonates, relative changes in sea level significantly impact the lithology, porosity, diagenesis, bed and bounding surfaces which are all factors that control fracture patterns. This study explores these relationships by integrating stratigraphy with fracture analysis and petrophysical properties. A special focus is given to the relationship between mechanical boundaries and sequence stratigraphic boundaries in three different settings: 1) Mississippian strata in Sheep Mountain Anticline, Wyoming, 2) Mississippian limestones in St. Louis, Missouri, and 3) Pennsylvanian limestones intermixed with clastics in the Paradox Basin, Utah. The analysis of these sections demonstrate that a fracture hierarchy exists in relation to the sequence stratigraphic hierarchy. The majority of fractures (80%) terminate at genetic unit boundaries or the internal flooding surface that separates the transgressive from regressive hemicycle. Fractures (20%) that do not terminate at genetic unit boundaries or their internal flooding surface terminate at lower order sequence stratigraphic boundaries or their internal flooding surfaces. Secondly, the fracture spacing relates well to bed thickness in mechanical units no greater than 0.5m in thickness but with increasing bed thickness a scatter from the linear trend is observed. In the Paradox Basin the influence of strain on fracture density is illustrated by two sections measured in different strain regimes. The folded strata at Raplee Anticline has higher fracture densities than the flat-lying beds at the Honaker Trail. Cemented low porosity rocks in the Paradox Basin do not show a correlation between fracture pattern and porosity. However velocity and rock stiffness moduli's display a slight correlation to fracture spacing. Furthermore, bed thickness is found to be only one factor in determining fracture density but with increasing strain, internal bedforms and rock petrophysical heterogeneities influence fracture density patterns. This study illustrates how integrating sedimentologic and sequence stratigraphic interpretations with data on structural kinematics can lead to refined predictive understanding of fracture attributes.

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Regmi, Raju. « Nanophotonic antennas for enhanced single-molecule fluorescence detection and nanospectroscopy in living cell membranes ». Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0523/document.

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La spectroscopie de fluorescence de molécule individuelle a révolutionné le domaine des sciences biophysiques, en permettant la visualisation des interactions moléculaires dynamiques et des caractéristiques nanoscopiques avec une haute résolution spatio-temporelle. Le contrôle des réactions enzymatiques et l'étude de la dynamique de diffusion de molécules individuelles permet de comprendre l'influence et le contrôle de ces entités nanoscopiques sur plusieurs processus biophysiques. La nanophotonique basée sur la plasmonique offre des nouvelles opportunités de suivi d'évènements à molécule unique, puisque il est possible de confiner des champs électromagnétiques dans les hotspots à nano-échelle, à dimensions spatiales comparables à une molécule unique. Dans ce projet de thèse, nous explorons plusieurs plateformes de nanoantennas photoniques avec des hotspots, et nous avons démontré les applications dans l'amélioration de la spectroscopie de fluorescence de molécule individuelle. En utilisant la fluorescence burst analysis, l'analyse de fluctuations temporelle de fluorescence,TCSPC, nous quantifions les facteurs d'amélioration de fluorescence, les volumes de détection de nanoantennas; ainsi, nous discutons l'accélération de fluorescence photo dynamique. En alternative aux structures plasmoniques, des antennes diélectriques basées sur les dimères en silicone ont aussi démontré d'améliorer la détection de fluorescence à molécule unique, pour des concentrations micro molaires physiologiquement pertinentes. En outre, nous explorons des systèmes planaires antennas in box pour l'investigation de la dynamique de diffusion de la PE et de la SM dans les membranes des cellules vivantes
Single-molecule fluorescence spectroscopy has revolutionized the field of biophysical sciences by enabling visualization of dynamic molecular interactions and nanoscopic features with high spatiotemporal resolution. Monitoring enzymatic reactions and studying diffusion dynamics of individual molecules help us understand how these nanoscopic entities influence and control various biochemical processes. Nanophotonic antennas can efficiently localize electromagnetic radiation into nanoscale spatial dimensions comparable to single bio-molecules. These confined illumination hotspots there by offer the opportunity to follow single-molecule events at physiological expression levels. In this thesis, we explore various photonic nanoantenna platforms and demonstrate their application in enhanced single-molecule fluorescence detection. Using fluorescence burst analysis, fluorescence correlation spectroscopy (FCS), time-correlated TCSPC measurements, and near field simulations, we quantify nanoantenna detection volumes, fluorescence enhancement factors and discuss the fluorescence photodynamic accelerations mediated by optical antennas. Further, using resonant planar antenna-in-box devices we investigate the diffusion dynamics of phosphoethanolamine and sphingomyelin on the plasma membrane of living cells and discuss the results in the context of lipid rafts. Together with cholesterol depletion experiments, we provide evidence of cholesterol-induced nanodomain partitioning within less than 10~nm diameters and characteristic times being ~100 microseconds

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Sands, Caroline Jane. « Statistical correlation based methods for enhanced interpretation of, and information recovery from, NMR metabolic data sets ». Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/7061.

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Owing to its ability to capture a systemic and temporal metabolic description of an organism’s response to a treatment, metabonomics is a well-established and valuable approach in elucidating the effects and mechanisms of a given perturbation. However, to optimise information recovery from the complex datasets generated, chemometric methods are essential. The work presented in this thesis focuses on the development of novel methods, and the use of existing methods in new applications to ease data interpretation and enhance information recovery from 1H Nuclear Magnetic Resonance (NMR) metabonomic datasets using correlation based methods. Although the methods here are largely applied to toxicological data, they could be equally valuable in the analysis of any metabonomic dataset, and indeed potentially to other ‘omics’ data presenting similar analytical challenges. The first two methodological approaches relate to novel extensions of Statistical Total Correlation Spectroscopy (STOCSY), a valuable tool in elucidation of both inter- and intra-metabolite spectral intensity correlations in NMR metabonomic datasets. In the first, STOCSY is utilised in STOCSY-editing, a method for the selective identification and downscaling of the peaks from unwanted metabolites such as those arising from xenobiotics. Structurally correlated peaks from drug metabolites are first identified using STOCSY, and the returned correlation information utilised to scale the spectra across these regions, producing a modified set of spectra in which drug metabolite contributions are reduced, endogenous peaks reconstructed and thus, analysis by pattern recognition methods without drug metabolite interferences facilitated. In the second, the STOCSY approach is extended in Iterative-STOCSY, where metabolic associations are followed over several rounds of STOCSY through calculation of correlation coefficients initially from a driver spectral peak of interest, and subsequently from all peaks identified as correlating above a set threshold to peaks picked in the previous round. The condensation of putatively structurally related peaks into single nodes, and representation of the otherwise complex network in a fully interactive plot of node-to-node connections and corresponding spectral data, allows the ready exploration of both inter- and intrametabolite relationships and a more directed approach to the identification of biomarkers of the studied perturbation. Finally various clustering methods are investigated with the aim of providing improved structural (intra-metabolite) versus non-structural (inter-metabolite) assignment. Thus, this thesis presents a framework for the enhanced identification, recovery and characterisation of inter- and intrametabolite relationships and how these are affected by metabonomic perturbation.

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Daemi, Bita. « Enhanced image analysis, a tool for precision metrology in the micro and macro world ». Doctoral thesis, KTH, Industriell produktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207594.

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The need for high speed and cost efficient inspection in manufacturing lineshas led to a vast usage of camera-based vision systems. The performance ofthese systems is sufficient to determine shape and size, but hardly to an accuracylevel comparable with traditional metrology tools. To achieve highprecision shape/position/defect measurements, the camera techniques haveto be combined with high performance image metrology techniques whichare developed and adapted to the manufactured components. The focus ofthis thesis is the application of enhanced image analysis as a tool for highprecision metrology. Dedicated algorithms have been developed, tested andevaluated in three practical cases ranging from micro manufacturing at submicronprecision to meter sized aerospace components with precision requirementsin the 10 μm range.The latter measurement challenge was solved by low cost standard consumerproducts, i.e. digital cameras in a stereo configuration and structured lightfrom a gobo-projector. Combined with high-precision image analysis and anew approach in camera calibration and 3D reconstruction for precise 3Dshape measurement of meter sized surfaces, the achievement was fulfilledand verified by two conventional measurement systems; a high precisioncoordinate measurement machine and a laser scanner.The sub-micron challenge was the implementation of image metrology forverification of micro manufacturing installations within a joint Europeaninfrastructure network, EUMINAfab. The results were an unpleasant surprisefor some of the participating laboratories, but became a big step forwardto improve the dimensional accuracy of the investigated laser micromachining, micro milling and micro-printing systems, since the accuracy ofthese techniques are very difficult to assess.The third high precision metrology challenge was the measurement of longrange,low-amplitude topographic structures on specular (shiny) aerodynamicsurfaces. In this case Fringe Reflection Technique (FRT) was appliedand image analysis algorithms were used to evaluate the fringe deformationas a measure of the surface slopes to obtain high resolution data. The resultwas compared with an interferometric analysis showing height deviation inthe range of tens of micrometers over a lateral extension of several cm.

QC 20170523

LOCOMACHS
EUMINAfab
Cleansky

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Gulas, Michal. « Growth of carbon nanotubes by plasma enhanced hot filament catalytic chemical vapour deposition : Correlation between gas phase and substrate surface ». Université Louis Pasteur (Strasbourg) (1971-2008), 2008. http://www.theses.fr/2008STR13144.

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Regmi, Raju. « Nanophotonic antennas for enhanced single-molecule fluorescence detection and nanospectroscopy in living cells membranes ». Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461707.

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Single-molecule fluorescence spectroscopy has revolutionized the field of biophysical sciences by enabling visualization of dynamic molecular interactions and nanoscopic features with high spatiotemporal resolution. Monitoring enzymatic reactions and studying diffusion dynamics of individual molecules (such as lipids and proteins) help us understand how these nanoscopic entities influence and control various biochemical processes. Nanophotonic antennas can efficiently localize electromagnetic radiation into nanoscale spatial dimensions comparable to single bio-molecules (<10 nm). These ultra-confined illumination hotspots thereby offer opportunity to follow single-molecule events at physiological expression levels. In this thesis, we explore various photonic nanoantenna platforms (double nanohole apertures, dimer nanogap antennas and planar "antenna-in-box'') and demonstrate their application in enhanced single-molecule fluorescence detection. Using fluorescence burst analysis, fluorescence correlation spectroscopy (FCS), time-correlated TCSPC measurements, and near field simulations, we quantify nanoantenna detection volumes, fluorescence enhancement factors and discuss the fluorescence photodynamic accelerations mediated by optical nanoantennas. An alternative to plasmonic structures, all-dielectric nanoantenna based on silicon nanogap is also demonstrated to enhance the fluorescence detection of single molecules diffusing in concentrated solutions. Further, using resonant planar "antenna-in-box'' devices we investigate the diffusion dynamics of phosphoethanolamine and sphingomyelin on the plasma membrane of living cells and discuss the results in the context of lipid rafts. Together with cholesterol depletion experiments, we provide evidence of cholesterol-induced nanodomain partitioning within less than 10 nm diameters and characteristic times being ~100 microseconds
La espectroscopia de fluorescencia de una sola molecula ha revolucionado el campo de las ciencias biofisicas, permitiendo la visualizacion de interacciones moleculares dinamicas y caracteristicas nanoscopicas con alta resolucion espaciotemporal. La monitorizacion de las reacciones enzimaticas y el analisis de la dinamica de difusion de moleculas individuales (como lipidos y proteinas) nos ayudan a comprender como estas entidades nanoscopicas influyen y controlan diversos procesos bioquimicos. Las antenas nanofotonicas pueden localizar eficientemente la radiacion electromagnetica en dimensiones espaciales en nanoescala, comparables a biomoleculas unicas (<10 nm). Estos hotspots de iluminacion ultra configurados ofrecen de este modo la oportunidad de monitorizar eventos de molecula unica a niveles de expresion fisiologica. En esta tesis, exploramos varias plataformas fotonicas de nanoantenas (double nanohole aperture, dimero nanogap antenas y "antenna-in-box" planares) y demostramos su aplicacion en la mejora de la deteccion una sola molecula de fluorescencia. Utilizando el analisis por explosion de fluorescencia, espectroscopia de correlacion de fluorescencia (FCS), medidas TCSPC correlacionadas en el tiempo y simulaciones de campo cercano, cuantificamos volumenes de deteccion de nanoantenas, factores de mejora de fluorescencia y discutimos las aceleraciones fotodinámicas de fluorescencia mediada por nanoantennas opticas. Las nanoantennas dielectricas basadas en nanogaps de silico se han propuesto como una alternativa en el realce de la deteccion de fluorescencia de difusion de moleculas unicas en soluciones concentradas. Ademas, utilizando dispositivos resonantes planares de "antenna-in-box", investigamos la dinamica de difusion de la fosfoetanolamina y la esfingomielina en la membrana plasmatica de las celulas vivas y discutimos los resultados en el contexto de las balsas lipidicas. Junto con experimentos de dismincion de colesterol, proporcionamos pruebas de division inducida por colesterol en el nanodominio dentro de diametros menors de 10 nm y con tiempos caracteristicos de ~100 microsegundos.
La spectroscopie de fluorescence d'une seule molécule a révolutionné le domaine des sciences biophysiques, permettant la visualisation d'interactions moléculaires dynamiques et de caractéristiques nanoscopiques à haute résolution spatio-temporelle. Le suivi des réactions enzymatiques et l'analyse de la dynamique de diffusion des molécules individuelles (telles que les lipides et les protéines) nous aident à comprendre comment ces entités nanoscopiques influencent et contrôlent divers processus biochimiques. Les antennes nanophotoniques peuvent localiser efficacement le rayonnement électromagnétique à des dimensions spatiales nanométriques, comparables à des biomolécules uniques (<10 nm). Ces hotspots d'éclairage ultra-configurés offrent la possibilité de surveiller les événements de molécules uniques à des niveaux d'expression physiologiques. Dans ce mémoire, nous examinons plusieurs plates-formes photoniques nanoantennas (nanotrou à double ouverture, I antennes Dimer nanoespace et plane « antenne-in-box ») et de démontrer son application dans l'amélioration de la détection d'une fluorescence seule molécule. Utilisation de l'analyse par spectroscopie de fluorescence d'explosion corrélation de fluorescence (FCS), les mesures TCSPC corrélées dans le temps et proches des simulations champ quantifier les volumes de détection de nanoantennas, les facteurs d'amélioration fluorescence et discuter des accélérations photodynamiques fluorescence médiée nanoantennas opticas. Des nanoantennas diélectriques à base de nanogap silico ont été proposées comme alternative dans l'amélioration de la détection par fluorescence de la diffusion de molécules uniques dans des solutions concentrées. En outre, l'utilisation de "plan d'antenne-in-box" dispositifs de résonance, nous étudions la dynamique de diffusion de phosphoéthanolamine et sphingomyéline dans la membrane plasmique des cellules vivantes et de discuter des résultats dans le contexte des radeaux lipidiques. Conjointement avec des expériences de réduction du cholestérol, nous fournissons des tests de division induits par le cholestérol dans le nanodomaine dans des diamètres plus petits de 10 nm et avec des temps caractéristiques de ~ 100 microsecondes.

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Barulin, Aleksandr. « Label-free single protein fluorescence detection in the UV enhanced by aluminum plasmonic nanostructures ». Thesis, Aix-Marseille, 2020. http://theses.univ-amu.fr.lama.univ-amu.fr/201204_BARULIN_360oitqab739occoku598wcb932u_TH.pdf.

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Les techniques de fluorescence de molécule individuelle permettent de suivre la dynamique moléculaire et les interactions dans les processus biologiques. Maintenant, la dynamique moléculaire des protéines est principalement accompagnée du marquage fluorescent externe. Cependant, une molécule attachée peut perturber la dynamique de protéines. Heureusement, la majorité des protéines contiennent le tryptophane ou la tyrosine qui absorbent et émettent la lumière dans le domaine spectral d'UV entre 260 nm et 400 nm. Ces acides aminés ont de basses efficacités quantiques, photostabilisées dans l'UV et la section efficace d'absorption, qui gênent la détection des protéines individuelles. Afin d'atteindre la sensitivité de l'auto fluorescence UV des protéines individuelles, nous développons un microscope confocal UV à la résolution temporelle avec les lasers de 266 nm et 295 nm. Nous quantifions la sensitivité de détection et l'effet des techniques de photostabilisation sur l'autofluorescence des protéines. La spectroscopie de corrélation de fluorescence (SCF) et les mesures de time-correlated single photon counting (TCSPC) fournissent des informations quantitatives du volume de détection, de l'amélioration de fluorescence (AF), et de la photokinétique accélérée des molécules émettant à la présence et à l'absence des nanostructures d'aluminium (Al). En utilisant le p-terphenyl, nous optimisons les nanostructures plasmoniques d'Al afin d'améliorer la fluorescence. Sous certaines conditions, le confinement de la lumière et l'AF dans les structures d'Al permettent d'appliquer la plasmonique UV pour la détection des protéines individuelles de beta-galactosidase sans marquage
Single molecule fluorescence techniques enable to monitor the molecular dynamics and interactions in the biological processes. Nowadays, the molecular dynamics of proteins is principally accompanied by external fluorescent labeling. However, an attached molecule might perturb the protein dynamics. Fortunately, a vast majority of proteins contain tryptophan and tyrosine that absorb and emit light in the UV range of 260-400 nm. These intrinsically fluorescent amino acids yield limited absorption cross-section, quantum yield, and photostability in the UV range, which hampers single protein UV autofluorescence detection. In order to reach single molecule sensitivity of protein UV autofluorescence, we develop a time-resolved UV confocal microscope with 266 nm and 295 nm excitations and the detection optics in the near UV. Based on the total fluorescence time traces, we quantify the single molecule sensitivity, the effect of photostabilization techniques on the protein autofluorescence. Fluorescence correlation spectroscopy (FCS) and time-correlated single photon counting (TCSPC) measurements provide quantitative information on the detection volume, the fluorescence enhancement factors, and the accelerated photokinetics of the UV emitting molecules in the presence and absence of the aluminum (Al) nanostructures. Using p-terphenyl as a bright UV emitting molecule, we optimize the Al plasmonic nanostructures to enhance the single molecule fluorescence. Under certain conditions, the light confinement and fluorescence enhancement in the aluminum nanostructures enable to apply the UV plasmonics for the single molecule detection of label-free beta-galactosidase protein

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Riccardi, Francesco. « Experimental and numerical investigation of the interaction between concrete and FRP reinforcement anchorages ». Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST065.

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Des opérations de renforcement ou réparation sont souvent nécessaires pour garantir l’intégrité des structures en Béton Armé (BA) vis-à-vis du risque sismique. Dans ce cadre, le Polymère Renforcé de Fibres (PRF) stratifié au contact a démontré son efficacité pour améliorer le comportement en flexion des éléments de structures tant en termes de résistance que de ductilité. Afin d’en améliorer la liaison en proximité des jonctions, les ancrages noyés dans le béton représentent une solution avantageuse en termes de performances et de facilité de mise en place. Néanmoins, leur comportement mécanique est fréquemment associé à des mécanismes locaux de déformation qui peuvent affecter la réponse globale de la structure. Un nouveau montage expérimental a été donc conçu pour réaliser des essais de flexion in-situ sur des poutres renforcées de petite échelle avec l’utilisation de la tomographie 3D et étudier l’interaction entre le béton et les ancrages. L’objectif principal est de suivre grâce à la Corrélation d’Images Volumiques (CIV) l’évolution de la dégradation du matériau pendant le chargement et de reconstruire la cinématique de la zone renforcée. D’un point de vue numérique, un modèle éléments finis enrichis inspiré par la Méthode des Discontinuités Fortes (SDA) a été développé dans le but d’améliorer la représentation de l’interface. De cette façon, des comportements mécaniques complexes comme les phénomènes d’arrachement peuvent être facilement reproduits, en limitant en même temps le coût de calcul. La calibration du comportement d’interface est faite enfin grâce aux résultats des essais in-situ qui permettent de valider le modèle dans le cas de problèmes non-linéaires
Strengthening and retrofitting techniques are often required for guaranteeing the integrity of Reinforced Concrete (RC) structures to prevent seismic risk. In such a framework, Externally Bonded (EB) FRP strengthening systems have proven their effectiveness in enhancing the flexural performances of structural members both in terms of bearing capacity and ductility. In order to improve the bond in the vicinity of RC joints, embedded anchors represent an attractive solution in terms of both performances and ease of installation. Nevertheless, their mechanical behaviour is often associated with localised deformation mechanisms that can strongly affect the overall structural response. A novel experimental apparatus has therefore been designed in order to carry out in-situ bending tests on small-scale strengthened beams in conjunction with 3D tomography and study the interaction between concrete and anchors. The main goal is to track the evolution of material degradation over the entire loading history by means of Digital Volume Correlation (DVC) and to reconstruct the kinematics of the strengthened region. From a numerical point of view, an enriched finite element model inspired by the Strong Discontinuity Approach (SDA) has been developed with the aim of improving the interface representation. By means of a kinematic enrichment, this strategy allows, on the one hand, to account for complex mechanical behaviours such as pull-out deformation modes and debonding mechanisms, on the other hand, to limit the computational effort. The calibration of the interfacial behaviour is then realised by means of the in-situ experimental results which allow to validate the model in the case of non-linear problems

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Hayes, Anthony. « Quantum enhanced metrology : quantum mechanical correlations and uncertainty relations ». Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/78385/.

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The foundational theory of quantum enhanced metrology for parameter estimation is of fundamental importance to the progression of science and technology as the scientific method is built upon empirical evidence, the acquisition of which is entirely reliant on measurement. Quantum mechanical properties can be exploited to yield measurement results to a greater precision (lesser uncertainty) than that which is permitted by classical methods. This has been mathematically demonstrated by the derivation of theoretical bounds which place a fundamental limit on the uncertainty of a measurement. Furthermore, quantum metrology is of immediate interest in the application of quantum technologies since measurement plays a central role. This thesis focuses on the role of quantum correlations and uncertainty relations which govern the precision bounds. We show how correlations can be distributed amongst limited resources in realistic scenarios, as permitted by current experimental capabilities, to achieve higher precision measurements than current approaches. This is extended to the setting of multiparameter estimation in which we demonstrate a more technologically feasible method of correlation distribution than those previously posited which perform as well as, or worse than, our scheme. Furthermore, a quantum metrology protocol is typically comprised of three stages: probe state preparation, sensing and then readout, where the time required for the first and last stages is usually neglected. We consider the more realistic sensing scenario of time being a limited resource which is divided amongst the three stages and demonstrate the most efficient use of this resource. Additionally, we take an information theoretic approach to quantum mechanical uncertainty relations and derive a one-parameter class of uncertainty relations which supplies more information about the quantum mechanical system of interest than conventional uncertainty relations. Finally, we demonstrate how we can use this class of uncertainty relations to reconstruct information of the state of the quantum mechanical system.

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Livres sur le sujet "ENHANCED CORRELATION"

United States. National Aeronautics and Space Administration., dir. Fuzzy interference enhanced information recovery from digital PIV using cross-correlation combined with particle tracking. [Washington, D.C.] : National Aeronautics and Space Administration, 1995.

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Cofffer, Alexander. An enhanced correlation analysis of the corrosion of steel reinforced OPC and PFA concrete, resulting from chloride ingression. [London] : Queen Mary and Westfield College, 1997.

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Graves, Anne, et Jana Echevarria. Sheltered Content Instruction : Teaching English Learners with Diverse Abilities, Enhanced Pearson eText - Access Card. Pearson, 2014.

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Short, Deborah J. Making Content Comprehensible for Secondary English Learners : The SIOP Model, Enhanced Pearson EText -- Access Card. Pearson Education Canada, 2017.

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Short, Deborah J. Making Content Comprehensible for Elementary English Learners : The SIOP Model, Enhanced Pearson EText -- Access Card. Pearson Education Canada, 2017.

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Short, Deborah J., Jana J. Echevarria et MaryEllen J. Vogt. Making Content Comprehensible for Secondary English Learners : The SIOP Model, with Enhanced Pearson EText -- Access Card Package. Pearson Education, 2017.

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Short, Deborah J., Jana J. Echevarria et MaryEllen J. Vogt. Making Content Comprehensible for Elementary English Learners : The SIOP Model, with Enhanced Pearson EText -- Access Card Package. Pearson Education Canada, 2017.

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Bishop, Michael. Clinical Chemistry : Principles, Techniques, and Correlations, Enhanced Edition. Jones & Bartlett Learning, LLC, 2020.

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Martin, Jeffrey J. Exercise and Body Image. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190638054.003.0038.

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A major research question in disability exercise psychology is if exercise can positively influence body image. The purpose of this chapter is to review the research on disability, exercise, and body image. Physical activity (PA) may enhance perceptions of body image because people can lose body fat and increase their muscularity. It can also enhance functionality and make activities of daily living easier and help people shift their focus from appearance to body function. PA can reduce the negative evaluations and increase the positive evaluations that individuals with disabilities receive from others. Correlational studies have provided some support for a link between body image and exercise, as social physique anxiety is negatively linked to self-esteem and athletic identity among athletes with disabilities. Qualitative researchers have documented exercisers and athletes proclaiming the importance of PA in helping them feel good about their bodies. Limited intervention research has shown that PA can produce enhanced body image cognitions, such as increased body satisfaction.

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Clarke, Andrew. Temperature and diversity. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199551668.003.0015.

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The diversity (species richness) of plants and animals is typically highest in the tropics and the strongest environmental correlate of species richness is often climate. The energy for plant production is sunlight, but the rate is governed jointly by temperature and the availability of water (as captured by actual evapotranspiration, AET). Greater production is then linked to higher diversity because larger population size protects against stochastic extinction (the more individuals mechanism). A greater biomass and diversity of plants allows for a greater diversity of herbivores and so on through the food web, though the correlation with climate (AET) gets progressively weaker at higher trophic levels. This is the basis of the species-energy theory of diversity. The Metabolic Theory of Biodiversity posits a mechanistic explanation for higher diversity in warmer places mediated through an enhanced generation of mutations as a by-product of the faster metabolic rate associated with a higher body temperature. Evidence for this is equivocal, and this mechanism cannot explain the strong association between endotherm species richness and climate. The striking differences between the northern and southern hemispheres point to an important role for history, particularly recent glacial history, in influencing current patterns of diversity. We still lack a comprehensive theory of biological diversity, but evidence points to a complex series of factors being important, with the dominant ones being energy and time (history).

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Chapitres de livres sur le sujet "ENHANCED CORRELATION"

Moradi, Amir, Oliver Mischke et Thomas Eisenbarth. « Correlation-Enhanced Power Analysis Collision Attack ». Dans Cryptographic Hardware and Embedded Systems, CHES 2010, 125–39. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15031-9_9.

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Zou, Mianlu, Zhongyi Hu, Qi Wu et Changzu Chen. « Tracking via Enhanced Context-Aware Correlation Filter ». Dans Lecture Notes in Electrical Engineering, 268–76. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9698-5_31.

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Benferhat, Salem, Fabien Autrel et Frédéric Cuppens. « Enhanced Correlation in an Intrusion Detection Process ». Dans Lecture Notes in Computer Science, 157–70. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45215-7_13.

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Yusof, Robiah, Siti Rahayu Selamat, Shahrin Sahib, Mohd Zaki Mas’ud et Mohd Faizal Abdollah. « Enhanced Alert Correlation Framework for Heterogeneous Log ». Dans Informatics Engineering and Information Science, 107–22. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25327-0_10.

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Ou, Changhai, Zhu Wang, Degang Sun, Xinping Zhou, Juan Ai et Na Pang. « Enhanced Correlation Power Analysis by Biasing Power Traces ». Dans Lecture Notes in Computer Science, 59–72. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45871-7_5.

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Fulger, Daniel, et Enrico Scalas. « Spectral Properties of Correlation Matrices – Towards Enhanced Spectral Clustering ». Dans Methods in Molecular Biology, 381–411. Totowa, NJ : Humana Press, 2010. http://dx.doi.org/10.1007/978-1-60761-987-1_25.

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Zhu, Nan, et Zhao Li. « Recaptured Image Detection Through Enhanced Residual-Based Correlation Coefficients ». Dans Cloud Computing and Security, 624–34. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00021-9_55.

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Wakahara, Toru, et Yukihiko Yamashita. « Enhanced GPT Correlation for 2D Projection Transformation Invariant Template Matching ». Dans Lecture Notes in Computer Science, 435–45. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24947-6_36.

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Wiemers, Andreas, et Dominik Klein. « Entropy Reduction for the Correlation-Enhanced Power Analysis Collision Attack ». Dans Advances in Information and Computer Security, 51–67. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97916-8_4.

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Fouzia, Syeda, Mark Bell et Reinhard Klette. « Improved Saliency-Enhanced Multi-cue Correlation-Filter-Based Visual Tracking ». Dans Image and Video Technology, 240–54. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34879-3_19.

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Actes de conférences sur le sujet "ENHANCED CORRELATION"

Pedrini, G., D. Hopp, U. Gopinathan et W. Osten. « Resolution enhanced technologies in digital holography ». Dans Correlation Optics 2009. SPIE, 2009. http://dx.doi.org/10.1117/12.849634.

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Scholl, Marija S., Michael S. Shumate et Gabriel Udomkesmalee. « Object-enhanced optical correlation ». Dans San Diego, '91, San Diego, CA, sous la direction de Bahram Javidi. SPIE, 1991. http://dx.doi.org/10.1117/12.49707.

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Khoury, J., P. Gianino, J. Kane et C. Woods. « Enhanced storage with binary phase associative memories ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.mqq7.

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Most holographic associative memories share a similar architecture, which is essentially a correlator with a retroreflecting thresholding device. The thresholding device performs two functions: it reduces cross correlation components, and it sharpens the correlation peak so that it is more like a δ function. In order to enhance the storage capabilities of the binary phase-only associative memory demonstrated in our previous work, these two operations must be improved. We have examined two techniques for this purpose; the first is de blocking, which improves the signal to noise ratio, and the second is cascading the BPOF with a Laplacian filter, which enhances the correlation peak and reduces the noise. Our results show that de blocking can enhance the storage capability by a factor of 4 and Laplacian filtering enhances the storage capability by a factor of 6.

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Anderegg, F., D. H. E. Dubin, T. M. O'Neil et C. F. Driscoll. « Measurements of correlation-enhanced collision rates ». Dans NON-NEUTRAL PLASMA PHYSICS VIII : 10th International Workshop on Non-Neutral Plasmas. AIP, 2013. http://dx.doi.org/10.1063/1.4796082.

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Nilsson, Martin, et Henrik Jorntell. « Correlation-enhanced adaptive Internal Model Control ». Dans 2010 2nd International Conference on Industrial Mechatronics and Automation (ICIMA 2010). IEEE, 2010. http://dx.doi.org/10.1109/icindma.2010.5538225.

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Mishachev, Nikolai, Anatoly Shmyrin et Andrey Kanyugin. « Multiple Correlation Coefficient Versus Tolerances ». Dans 2023 3rd International Conference on Technology Enhanced Learning in Higher Education (TELE). IEEE, 2023. http://dx.doi.org/10.1109/tele58910.2023.10184346.

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Lee, Sungho, Narae Choi et Woong Il Choi. « Enhanced Correlation Matching based Video Frame Interpolation ». Dans 2022 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV). IEEE, 2022. http://dx.doi.org/10.1109/wacv51458.2022.00318.

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Kim, May Eun Yeon. « Optical atomic clock comparisons using correlation spectroscopy (Conference Presentation) ». Dans Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II, sous la direction de Selim M. Shahriar et Jacob Scheuer. SPIE, 2020. http://dx.doi.org/10.1117/12.2552651.

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Chang, Chung-Chih, Ming-Seng Hsu, Shiang-Shi Cheng, Wei-Chia Su et Yueh Ouyang. « Optical implementation of edge-enhanced triple correlation via four-wave-mixing correlator ». Dans Practical Holography XXIII : Materials and Applications. SPIE, 2009. http://dx.doi.org/10.1117/12.809907.

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Kast, B. A., F. M. Dickey et M. L. Yee. « Gray scale correlation with a real-time AO correlator : experimental results ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.ws1.

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Real-time correlation in the spatial domain has been demonstrated previously by using an acousto-optical (AO) correlator. This acousto-optic system performs correlations at high frame rates, which permits the implementation of real-time pattern recognition algorithms that use multiple templates. Previous work has been done with edge-enhanced templates and images, by using binary rather than full gray-scale pixels. The present work shows the ability of the AO correlator to process gray-scale imagery for the purpose of implementing the classical matched filter. Since intensity invariance is an issue with gray-scale imagery, normalized correlation is implemented on the AO correlator. Experimental results obtained by using real gray-scale imagery are presented.

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Rapports d'organisations sur le sujet "ENHANCED CORRELATION"

Muller, Isabelle S., Keith S. Matlack, Ian L. Pegg et Innocent Joseph. Enhanced LAW Glass Correlation - Phase 1. Office of Scientific and Technical Information (OSTI), décembre 2016. http://dx.doi.org/10.2172/1347604.

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Muller, Isabelle S., Keith S. Matlack, Ian L. Pegg et Innocent Joseph. Enhanced LAW Glass Correlation - Phase 2 (Final Report, Rev. 0). Office of Scientific and Technical Information (OSTI), juin 2017. http://dx.doi.org/10.2172/1513830.

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Muller, Isabelle S., Keith S. Matlack, Ian L. Pegg et Innocent Joseph. Final Report : Enhanced LAW Glass Correlation - Phase 3, VSL-17R4230-1, Rev 0. Office of Scientific and Technical Information (OSTI), novembre 2017. http://dx.doi.org/10.2172/1512925.

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Fayer, Michael D. Enhanced Vibrational Echo Correlation Spectrometer for the Study of Molecular Dynamics, Structures, and Analytical Applications. Fort Belvoir, VA : Defense Technical Information Center, septembre 2006. http://dx.doi.org/10.21236/ada463590.

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Newcomer, P. P., E. L. Venturini, B. L. Doyle, D. K. Brice et H. Schoene. Correlation of intermediate ion energy induced extended defect continuity to enhanced pinning potential in Tl-2212 films. Office of Scientific and Technical Information (OSTI), septembre 1998. http://dx.doi.org/10.2172/672119.

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Zhang, Hongbin B., David J. Bonfil et Shahal Abbo. Genomics Tools for Legume Agronomic Gene Mapping and Cloning, and Genome Analysis : Chickpea as a Model. United States Department of Agriculture, mars 2003. http://dx.doi.org/10.32747/2003.7586464.bard.

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The goals of this project were to develop essential genomic tools for modern chickpea genetics and genomics research, map the genes and quantitative traits of importance to chickpea production and generate DNA markers that are well-suited for enhanced chickpea germplasm analysis and breeding. To achieve these research goals, we proposed the following research objectives in this period of the project: 1) Develop an ordered BAC library with an average insert size of 150 - 200 kb (USA); 2) Develop 300 simple sequence repeat (SSR) markers with an aid of the BAC library (USA); 3) Develop SSR marker tags for Ascochyta response, flowering date and grain weight (USA); 4) Develop a molecular genetic map consisting of at least 200 SSR markers (Israel and USA); 5) Map genes and QTLs most important to chickpea production in the U.S. and Israel: Ascochyta response, flowering and seed set date, grain weight, and grain yield under extreme dryland conditions (Israel); and 6) Determine the genetic correlation between the above four traits (Israel). Chickpea is the third most important pulse crop in the world and ranks the first in the Middle East. Chickpea seeds are a good source of plant protein (12.4-31.5%) and carbohydrates (52.4-70.9%). Although it has been demonstrated in other major crops that the modern genetics and genomics research is essential to enhance our capacity for crop genetic improvement and breeding, little work was pursued in these research areas for chickpea. It was absent in resources, tools and infrastructure that are essential for chickpea genomics and modern genetics research. For instance, there were no large-insert BAC and BIBAC libraries, no sufficient and user- friendly DNA markers, and no intraspecific genetic map. Grain sizes, flowering time and Ascochyta response are three main constraints to chickpea production in drylands. Combination of large seeds, early flowering time and Ascochyta blight resistance is desirable and of significance for further genetic improvement of chickpea. However, it was unknown how many genes and/or loci contribute to each of the traits and what correlations occur among them, making breeders difficult to combine these desirable traits. In this period of the project, we developed the resources, tools and infrastructure that are essential for chickpea genomics and modern genetics research. In particular, we constructed the proposed large-insert BAC library and an additional plant-transformation-competent BIBAC library from an Israeli advanced chickpea cultivar, Hadas. The BAC library contains 30,720 clones and has an average insert size of 151 kb, equivalent to 6.3 x chickpea haploid genomes. The BIBAC library contains 18,432 clones and has an average insert size of 135 kb, equivalent to 3.4 x chickpea haploid genomes. The combined libraries contain 49,152 clones, equivalent to 10.7 x chickpea haploid genomes. We identified all SSR loci-containing clones from the chickpea BAC library, generated sequences for 536 SSR loci from a part of the SSR-containing BACs and developed 310 new SSR markers. From the new SSR markers and selected existing SSR markers, we developed a SSR marker-based molecular genetic map of the chickpea genome. The BAC and BIBAC libraries, SSR markers and the molecular genetic map have provided essential resources and tools for modern genetic and genomic analyses of the chickpea genome. Using the SSR markers and genetic map, we mapped the genes and loci for flowering time and Ascochyta responses; one major QTL and a few minor QTLs have been identified for Ascochyta response and one major QTL has been identified for flowering time. The genetic correlations between flowering time, grain weight and Ascochyta response have been established. These results have provided essential tools and knowledge for effective manipulation and enhanced breeding of the traits in chickpea.

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Gupta, Kanika, Sung Soo Park, Antonio Bobet et Tommy Nantung. Improved Reliability of FWD Test Results and Correlations with Resilient Modulus. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317370.

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Resilient modulus (MR) is a key factor in the Mechanistic Empirical Pavement Design Guide (MEPDG) which was adopted by INDOT in January 2009. The resilient modulus can be determined in new pavement projects from subgrade soil samples collected at the site. However, for a pavement rehabilitation project, it becomes difficult to obtain soil information, and coring for samples may not be feasible because of traffic. The literature is rich with correlations between the MR of the subgrade obtained in the laboratory with that estimated from FWD tests in the field. However, the review conducted shows very contradictory and inconsistent findings, thus existing correlations seem to apply only to the cases investigated, i.e., they are ad hoc correlations and cannot be generalized. To improve the interpretation of the FWD data and enhance the reliability of the results in Indiana, FWD and GPR tests were performed at five different road construction projects at the same locations where soil samples were collected and tested in the laboratory for resilient modulus. The selected sites included roads with rigid pavement and treated subgrade and flexible pavement with untreated subgrade. The study showed that (1) FWD backcalculation is greatly affected by pavement thickness; (2) GPR can provide actual thicknesses and can identify discrepancies between as-built and design pavement thickness; (3) for flexible pavements, a one-to-one correlation exists between FWD modulus and laboratory resilient modulus values for untreated subgrade soils; (4) MODTAG or ELMOD codes can both be used to estimate the resilient modulus of the subgrade in flexible pavements; (5) for rigid pavements, results of FWD backcalculation analysis using ELMOD or MODTAG greatly overestimate the resilient modulus of the soil, with backcalculated moduli 1.3 to 6 times higher than laboratory results; (6) ELMOD is recommended for routine analysis of FWD data, while MODTAG is recommended for research or to evaluate the quality of the data, when needed.

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Eshel, Amram, Jonathan P. Lynch et Kathleen M. Brown. Physiological Regulation of Root System Architecture : The Role of Ethylene and Phosphorus. United States Department of Agriculture, décembre 2001. http://dx.doi.org/10.32747/2001.7585195.bard.

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Specific Objectives and Related Results: 1) Determine the effect of phosphorus availability on ethylene production by roots. Test the hypothesis that phosphorus availability regulates ethylene production Clear differences were found between the two plants that were studied. In beans ethylene production is affected by P nutrition, tissue type, and stage of development. There are genotypic differences in the rate of ethylene production by various root types and in the differential in ethylene production when P treatments are compared. The acceleration in ethylene production with P deficiency increases with time. These findings support the hypothesis that ethylene production may be enhanced by phosphorus deficiency, and that the degree of enhancement varies with genotype. In tomatoes the low-P level did not enhance significantly ethylene production by the roots. Wildtype cultivars and ethylene insensitive mutants behaved similarly in that respect. 2) Characterize the effects of phosphorus availability and ethylene on the architecture of whole root systems. Test the hypothesis that both ethylene and low phosphorus availability modify root architecture. In common bean, the basal roots give rise to a major fraction of the whole root system. Unlike other laterals these roots respond to gravitropic stimulation. Their growth angle determines the proportion of the root length in the shallow layers of the soil. A correlation between ethylene production and basal root angle was found in shallow rooted but not deep-rooted genotypes, indicating that acceleration of ethylene synthesis may account for the change in basal root angle in genotypes demonstrating a plastic response to P availability. Short-time gravitropic response of the tap roots of young bean seedlings was not affected by P level in the nutrient solution. Low phosphorus specifically increases root hair length and root hair density in Arabidopsis. We tested 7 different mutants in ethylene perception and response and in each case, the response to low P was lower than that of the wild-type. The extent of reduction in P response varied among the mutants, but every mutant retained some responsiveness to changes in P concentration. The increase in root hair density was due to the increase in the number of trichoblast cell files under low P and was not mediated by ethylene. Low P did not increase the number of root hairs forming from atrichoblasts. This is in contrast to ethylene treatment, which increased the number of root hairs partly by causing root hairs to form on atrichoblasts. 3) Assess the adaptive value of root architectural plasticity in response to phosphorus availability. A simulation study indicated that genetic variation for root architecture in common bean may be related to adaptation to diverse competitive environments. The fractal dimension of tomato root system was directly correlated with P level.

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Jeong, Stephen, Sarah Stawiski, Sol Bukin et Heather Champion. Stemming the Great Resignation through Leadership Development. Center for Creative Leadership, 2022. http://dx.doi.org/10.35613/ccl.2022.2051.

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The recent rise in voluntary turnover has sparked a renewed focus on attracting and retaining talent. In their attempts to stem the tide of the Great Resignation, organizations are augmenting traditional retention strategies – e.g., higher pay, enhanced benefits, more opportunities for career advancement etc. – with remote and hybrid work schedules brought about by the COVID pandemic. Given its inherent appeal to both employees and organizations, leadership development (LD) opportunities have long been believed to play a crucial role in helping to attract and retain employees. While the body of existing correlational research does point to a positive relationship between LD opportunities and retention, there is scant research that elucidates the mechanism(s) that may help to bridge the two. Guided by existing research, this paper examined Center for Creative Leadership’s large database of program evaluation data to uncover those potential mechanisms. We found preliminary support for three specific outcomes of leadership development that may serve as potential mediators linking LD with retention; they include enhanced self-efficacy, meaningful connections, and capacity to engage followers. We conclude with implications of these findings for future research as well as some caveats related to our investigation.

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Campi, Mercedes, Marco Dueñas et Tommaso Ciarli. Open configuration options Do Creative Industries Enhance Employment Growth ? Regional Evidence from Colombia. Inter-American Development Bank, février 2022. http://dx.doi.org/10.18235/0003993.

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Creative industries are considered highly innovative and productive, constituting an important driver of economic change. For high-income countries, several studies discuss the positive spillovers of creative industries for the local economy, for instance by attracting creative workers, which can benet entrepreneurs and workers in other industries. Like many other activities, creative industries are likely to dier in low- and middle-income countries compared to high-income countries. Moreover, the existing evidence is based on correlations between variables likely to be endogenous. This paper contributes to the literature on the role of creative industries in driving economic change in two main ways. First, we make a rst attempt to control for endogeneity and identify the impact of creative industries on local economies. Second, we report evidence for a middle-income country. Using granular employment data, we study the agglomeration patterns of creative industries across Colombian cities between 2008 and 2017. Exploiting the co-location of creative industries with other industries, we estimate the relation between employment growth in creative and non-creative industries in the same city. Using a shift-share instrumental variable approach, we estimate the multiplier eect of employment growth in creative industries on the employment growth in the rest of the economy. Creative industries represented between 2.7 and 3.3 percent of Colombian employment in 2008 and 2017. We nd that creative industries agglomerate mainly in three large cities (Bogota, Medelln, and Cartagena) and in a few smaller cities. Such agglomeration is positively related to an increase in the employment of non-creative services industries. For a positive causal relation to materialize, creative industries should have a larger size or be more connected to other economic sectors. However, after controlling for endogeneity, we nd no signicant impact of an increase of creative industries employment on employment growth in other industries.

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