Academic literature on the topic 'Correlation tracker'
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Journal articles on the topic "Correlation tracker"
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Mohamed, Islam, Ibrahim Elhenawy, Ahmed W. Sallam, Andrew Gatt, and Ahmad Salah. "A practical evaluation of correlation filter-based object trackers with new features." PLOS ONE 17, no. 8 (2022): e0273022. http://dx.doi.org/10.1371/journal.pone.0273022.
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Visual object tracking is a critical problem in the field of computer vision. The visual object tracker methods can be divided into Correlation Filters (CF) and non-correlation filters trackers. The main advantage of CF-based trackers is that they have an accepted real-time tracking response. In this article, we will focus on CF-based trackers, due to their key role in online applications such as an Unmanned Aerial Vehicle (UAV), through two contributions. In the first contribution, we proposed a set of new video sequences to address two uncovered issues of the existing standard datasets. The first issue is to create two video sequence that is difficult to be tracked by a human being for the movement of the Amoeba under the microscope; these two proposed video sequences include a new feature that combined background clutter and occlusion features in a unique way; we called it hard-to-follow-by-human. The second issue is to increase the difficulty of the existing sequences by increasing the displacement of the tracked object. Then, we proposed a thorough, practical evaluation of eight CF-base trackers, with the top performance, on the existing sequence features such as out-of-view, background clutters, and fast motion. The evaluation utilized the well-known OTB-2013 dataset as well as the proposed video sequences. The overall assessment of the eight trackers on the standard evaluation metrics, e.g., precision and success rates, revealed that the Large Displacement Estimation of Similarity transformation (LDES) tracker is the best CF-based tracker among the trackers of comparison. On the contrary, with a deeper analysis, the results of the proposed video sequences show an average performance of the LDES tracker among the other trackers. The eight trackers failed to capture the moving objects in every frame of the proposed Amoeba movement video sequences while the same trackers managed to capture the object in almost every frame of the sequences of the standard dataset. These results outline the need to improve the CF-based object trackers to be able to process sequences with the proposed feature (i.e., hard-to-follow-by-human).
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Hao, Zhaohui, Guixi Liu, Jiayu Gao, and Haoyang Zhang. "Robust Visual Tracking Using Structural Patch Response Map Fusion Based on Complementary Correlation Filter and Color Histogram." Sensors 19, no. 19 (2019): 4178. http://dx.doi.org/10.3390/s19194178.
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A part-based strategy has been applied to visual tracking with demonstrated success in recent years. Different from most existing part-based methods that only employ one type of tracking representation model, in this paper, we propose an effective complementary tracker based on structural patch response fusion under correlation filter and color histogram models. The proposed method includes two component trackers with complementary merits to adaptively handle illumination variation and deformation. To identify and take full advantage of reliable patches, we present an adaptive hedge algorithm to hedge the responses of patches into a more credible one in each component tracker. In addition, we design different loss metrics of tracked patches in two components to be applied in the proposed hedge algorithm. Finally, we selectively combine the two component trackers at the response maps level with different merging factors according to the confidence of each component tracker. Extensive experimental evaluations on OTB2013, OTB2015, and VOT2016 datasets show outstanding performance of the proposed algorithm contrasted with some state-of-the-art trackers.
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Li, Chunbao, and Bo Yang. "Robust Scale Adaptive Visual Tracking with Correlation Filters." Applied Sciences 8, no. 11 (2018): 2037. http://dx.doi.org/10.3390/app8112037.
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Visual tracking is a challenging task in computer vision due to various appearance changes of the target object. In recent years, correlation filter plays an important role in visual tracking and many state-of-the-art correlation filter based trackers are proposed in the literature. However, these trackers still have certain limitations. Most of existing trackers cannot well deal with scale variation, and they may easily drift to the background in the case of occlusion. To overcome the above problems, we propose a Correlation Filters based Scale Adaptive (CFSA) visual tracker. In the tracker, a modified EdgeBoxes generator, is proposed to generate high-quality candidate object proposals for tracking. The pool of generated candidate object proposals is adopted to estimate the position of the target object using a kernelized correlation filter based tracker with HOG and color naming features. In order to deal with changes in target scale, a scale estimation method is proposed by combining the water flow driven MBD (minimum barrier distance) algorithm with the estimated position. Furthermore, an online updating schema is adopted to reduce the interference of the surrounding background. Experimental results on two large benchmark datasets demonstrate that the CFSA tracker achieves favorable performance compared with the state-of-the-art trackers.
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Li, Chenpu, Qianjian Xing, Zhenguo Ma, and Ke Zang. "MFCFSiam: A Correlation-Filter-Guided Siamese Network with Multifeature for Visual Tracking." Wireless Communications and Mobile Computing 2020 (December 23, 2020): 1–19. http://dx.doi.org/10.1155/2020/6681391.
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With the development of deep learning, trackers based on convolutional neural networks (CNNs) have made significant achievements in visual tracking over the years. The fully connected Siamese network (SiamFC) is a typical representation of those trackers. SiamFC designs a two-branch architecture of a CNN and models’ visual tracking as a general similarity-learning problem. However, the feature maps it uses for visual tracking are only from the last layer of the CNN. Those features contain high-level semantic information but lack sufficiently detailed texture information. This means that the SiamFC tracker tends to drift when there are other same-category objects or when the contrast between the target and the background is very low. Focusing on addressing this problem, we design a novel tracking algorithm that combines a correlation filter tracker and the SiamFC tracker into one framework. In this framework, the correlation filter tracker can use the Histograms of Oriented Gradients (HOG) and color name (CN) features to guide the SiamFC tracker. This framework also contains an evaluation criterion which we design to evaluate the tracking result of the two trackers. If this criterion finds the SiamFC tracker fails in some cases, our framework will use the tracking result from the correlation filter tracker to correct the SiamFC. In this way, the defects of SiamFC’s high-level semantic features are remedied by the HOG and CN features. So, our algorithm provides a framework which combines two trackers together and makes them complement each other in visual tracking. And to the best of our knowledge, our algorithm is also the first one which designs an evaluation criterion using correlation filter and zero padding to evaluate the tracking result. Comprehensive experiments are conducted on the Online Tracking Benchmark (OTB), Temple Color (TC128), Benchmark for UAV Tracking (UAV-123), and Visual Object Tracking (VOT) Benchmark. The results show that our algorithm achieves quite a competitive performance when compared with the baseline tracker and several other state-of-the-art trackers.
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Woodham, Catherine A., William A. Sandham, and Tariq S. Durrani. "Error analysis for the seismic PDA tracker." GEOPHYSICS 60, no. 5 (1995): 1451–56. http://dx.doi.org/10.1190/1.1443879.
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A new method for assessing the accuracy of a seismic event tracking algorithm is presented. Currently, the accuracy of automatic event tracking algorithms is assessed by the interpreter without the aid of any tracker error analysis. It is clear that a method for mathematically analyzing the tracker accuracy is important, and the method described here enables an accurate assessment of the tracker confidence. The tracking of seismic events through 3-D data sets using probabilistic data association (PDA) is a recently developed technique. The method requires the correlation of information from trackers working in two perpendicular directions, and diagonally, and also from trackers working forward and backward through the data set. The information contained in the covariance matrix, which forms part of the standard Kalman filter model, may be used in the tracking of seismic events using PDA. The importance of this information is two‐fold—it gives an indication of the confidence of the tracker over a particular seismic event, and it may be used to improve the correlation of the tracker information. The relevant Kalman filter theory will be presented, and its use in analyzing the tracker errors and in improving the tracker correlation will be explained. It is clear from the examples presented that the tracker correlation, and hence the overall accuracy of the tracker, may be improved, and that the tracker confidence may be obtained.
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Zhou, Tongxue, Ming Zhu, Dongdong Zeng, and Hang Yang. "Scale Adaptive Kernelized Correlation Filter Tracker with Feature Fusion." Mathematical Problems in Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/1605959.
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Visual tracking is one of the most important components in numerous applications of computer vision. Although correlation filter based trackers gained popularity due to their efficiency, there is a need to improve the overall tracking capability. In this paper, a tracking algorithm based on the kernelized correlation filter (KCF) is proposed. First, fused features including HOG, color-naming, and HSV are employed to boost the tracking performance. Second, to tackle the fixed template size, a scale adaptive scheme is proposed which strengthens the tracking precision. Third, an adaptive learning rate and an occlusion detection mechanism are presented to update the target appearance model in presence of occlusion problem. Extensive evaluation on the OTB-2013 dataset demonstrates that the proposed tracker outperforms the state-of-the-art trackers significantly. The results show that our tracker gets a 14.79% improvement in success rate and a 7.43% improvement in precision rate compared to the original KCF tracker, and our tracker is robust to illumination variations, scale variations, occlusion, and other complex scenes.
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Kishore, M. Sankar, and K. Veerabhadra Rao. "Robust correlation tracker." Sadhana 26, no. 3 (2001): 227–36. http://dx.doi.org/10.1007/bf02703384.
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Zhu, Chengfei, Shan Jiang, Shuxiao Li, and Xiaosong Lan. "Efficient and Practical Correlation Filter Tracking." Sensors 21, no. 3 (2021): 790. http://dx.doi.org/10.3390/s21030790.
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Visual tracking is a basic task in many applications. However, the heavy computation and low speed of many recent trackers limit their applications in some computing power restricted scenarios. On the other hand, the simple update scheme of most correlation filter-based trackers restricts their robustness during target deformation and occlusion. In this paper, we explore the update scheme of correlation filter-based trackers and propose an efficient and adaptive training sample update scheme. The training sample extracted in each frame is updated to the training set according to its distance between existing samples measured with a difference hashing algorithm or discarded according to tracking result reliability. In addition, we expand our new tracker to long-term tracking. On the basis of the proposed model updating mechanism, we propose a new tracking state discrimination mechanism to accurately judge tracking failure, and resume tracking after the target is recovered. Experiments on OTB-2015, Temple Color 128 and UAV123 (including UAV20L) demonstrate that our tracker performs favorably against state-of-the-art trackers with light computation and runs over 100 fps on desktop computer with Intel i7-8700 CPU(3.2 GHz).
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Zhang, Fei, Shiping Ma, Lixin Yu, Yule Zhang, Zhuling Qiu, and Zhenyu Li. "Learning Future-Aware Correlation Filters for Efficient UAV Tracking." Remote Sensing 13, no. 20 (2021): 4111. http://dx.doi.org/10.3390/rs13204111.
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In recent years, discriminative correlation filter (DCF)-based trackers have made considerable progress and drawn widespread attention in the unmanned aerial vehicle (UAV) tracking community. Most existing trackers collect historical information, e.g., training samples, previous filters, and response maps, to promote their discrimination and robustness. Under UAV-specific tracking challenges, e.g., fast motion and view change, variations of both the target and its environment in the new frame are unpredictable. Interfered by future unknown environments, trackers that trained with historical information may be confused by the new context, resulting in tracking failure. In this paper, we propose a novel future-aware correlation filter tracker, i.e., FACF. The proposed method aims at effectively utilizing context information in the new frame for better discriminative and robust abilities, which consists of two stages: future state awareness and future context awareness. In the former stage, an effective time series forecast method is employed to reason a coarse position of the target, which is the reference for obtaining a context patch in the new frame. In the latter stage, we firstly obtain the single context patch with an efficient target-aware method. Then, we train a filter with the future context information in order to perform robust tracking. Extensive experimental results obtained from three UAV benchmarks, i.e., UAV123_10fps, DTB70, and UAVTrack112, demonstrate the effectiveness and robustness of the proposed tracker. Our tracker has comparable performance with other state-of-the-art trackers while running at ∼49 FPS on a single CPU.
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Du, Chenjie, Mengyang Lan, Mingyu Gao, Zhekang Dong, Haibin Yu, and Zhiwei He. "Real-Time Object Tracking via Adaptive Correlation Filters." Sensors 20, no. 15 (2020): 4124. http://dx.doi.org/10.3390/s20154124.
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Although correlation filter-based trackers (CFTs) have made great achievements on both robustness and accuracy, the performance of trackers can still be improved, because most of the existing trackers use either a sole filter template or fixed features fusion weight to represent a target. Herein, a real-time dual-template CFT for various challenge scenarios is proposed in this work. First, the color histograms, histogram of oriented gradient (HOG), and color naming (CN) features are extracted from the target image patch. Then, the dual-template is utilized based on the target response confidence. Meanwhile, in order to solve the various appearance variations in complicated challenge scenarios, the schemes of discriminative appearance model, multi-peaks target re-detection, and scale adaptive are integrated into the proposed tracker. Furthermore, the problem that the filter model may drift or even corrupt is solved by using high confidence template updating technique. In the experiment, 27 existing competitors, including 16 handcrafted features-based trackers (HFTs) and 11 deep features-based trackers (DFTs), are introduced for the comprehensive contrastive analysis on four benchmark databases. The experimental results demonstrate that the proposed tracker performs favorably against state-of-the-art HFTs and is comparable with the DFTs.
Dissertations / Theses on the topic "Correlation tracker"
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Söderberg, Martin. "Identifying Website Usability Solely from Gaze Data of Visual Search." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203976.
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If researchers are able to derive usability simply by analysing gaze data it provides a quick, objective and potentially automatic way of measuring the usability of an interface. In order to do that it is essential to know which traits of the gaze data that have an impact on usability. This paper investigates these traits by analysing different eye tracking metrics in the data. The goal is to see which of these metrics have a general correlation with usability. Previous research provides a clue about which metrics are useful when analysing usability. However, much of the research is based on subjective analysis or lacks in general applicability. This research provides an objective analysis that is independent of characteristics of the interface. A user study is done on 20 participants. They complete tasks on nine different ecommerce websites while their eye movements are recorded. Correlation is measured between usability and eye tracking metrics in order to investigate which metrics that are sensitive to changes in usability. The results show that fixational backtracks and number of fixations have the strongest correlation with usability. Previous research did suggest that both of these eye tracking metrics have an impact on usability.<br>Om det är möjligt för forskare att härleda användbarhet endast genom att analysera ögondata så tillhandahålls ett snabbt, objektivt och potentiellt automatiserat sätt att mäta användbarheten hos ett gränssnitt. För att göra detta är det avgörande att veta vilka karakteristiska drag i ögondatan som påverkar användbarheten. Denna rapport utforskar dessa drag genom att analysera olika mått i ögondatan. Målet är att se vilka av dessa mått som uppvisar en generell korrelation med användbarhet. Tidigare forskning förser oss med ledtrådar om vilka mått som är lämpliga att analysera när användbarhet ska mätas. Dock så är mycket av denna forskning baserad på subjektiv analys eller saknar generell tillämpbarhet. Denna rapport tillhandahåller en objektiv analys som är oberoende av karakteristiken hos gränssnittet. En användarstudie utförs på 20 deltagare. De utför uppgifter på nio olika webbsidor för e-handel medan deras ögonrörelser spelas in. Korrelation mäts mellan användbarhet och mått i ögondatan för att undersöka vilka mått som är känsliga för förändringar i användbarhet. Resultatet visar att tillbakabildande sackader och antal fixeringar har starkast korrelation med användbarhet. Tidigare forskning visade att båda dessa mått påverkades av användbarheten.
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Illien, Pierre. "Fluctuations and correlations of a biased tracer in a hardcore lattice gas." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066264/document.
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Nous étudions la dynamique d'un traceur soumis à une force extérieure dans un bain de particules. Nous proposons un modèle qui prend en compte explicitement la dynamique du bain, et qui décrit les corrélations entre la dynamique du traceur et la réponse du bain. Nous considérons un traceur biaisé dans un gaz de coeurs durs sur réseau : le traceur réalise une marche aléatoire biaisée tandis que les particules du bain réalisent des marches aléatoires symétriques. Nous étudions plus particulièrement les fluctuations de la position du traceur. Dans la limite de haute densité, nous obtenons des résultats exacts à l'ordre dominant en la densité de lacunes. En géométrie confinée, un calcul analytique des fluctuations de la position du traceur prévoit un long régime superdiffusif, et une transition vers un régime diffusif final. Nous proposons une description simplifiée du système qui révèle le mécanisme physique à l'origine de ce comportement anormal. Nous montrons l'existence d'une anomalie de la vitesse du traceur dans les systèmes quasi-1D. Nous étudions également le cas général d'une densité arbitraire de particules sur un réseau en contact avec un réservoir. Cette situation constitue un problème à N corps décrit par une équation maîtresse, qui ne peut être résolue qu'en recourant à une approximation de type champ moyen consistant en le découplage de certaines fonctions de corrélation. Il est alors possible de déterminer des valeurs approchées de la vitesse, de coefficient de diffusion du traceur ainsi que de la distribution de position du traceur. Nous montrons enfin que l'approximation de découplage est exacte dans les limites de basse et de haute densité<br>We study the dynamics of a tracer submitted to an external force in a bath of particles. We propose a model which takes explicitly into account the dynamics of the bath, and which describes the correlations between the dynamics of the tracer and the response of the bath. We consider a biased tracer in a lattice gas of hardcore particles: the tracer performs a biased random walk whereas the bath particles perform symmetric random walks. We study in particular the fluctuations of the position of the tracer. In the high-density limit, we obtain exact results at leading order in the density of vacancies. In confined geometries, an analytical calculation of the fluctuations of tracer position predicts a long superdiffusive regime, and a crossover to an ultimate diffusive regime. We give a simplified description of the system that unveils the physical mechanism explaining this anomalous behavior. We show the existence of a velocity anomaly in quasi-1D systems.We also study the general case of an arbitrary density of particles on a lattice in contact with a reservoir. This situation is a N-body problem described by a master equation, that can be solved by resorting to a mean-field-type approximation, which consists in the decoupling of relevant correlation functions. It is then possible to determine approximate values of the velocity, the diffusion coefficient and the distribution of the position of the tracer. We finally show that the decoupling approximation is exact in the high-density and low-density limits
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Wang, Dapeng [Verfasser]. "Tracer diffusion at water-oil interfaces studied by fluorescence correlation spectroscopy / Dapeng Wang." Mainz : Universitätsbibliothek Mainz, 2013. http://d-nb.info/1032369612/34.
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Vagias, Apostolos N. [Verfasser]. "Complex tracer mobilities in polymer networks revealed by fluorescence correlation spectroscopy / Apostolos N. Vagias." Mainz : Universitätsbibliothek Mainz, 2014. http://d-nb.info/1051237149/34.
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Chevalier, Dominique. "Les trachees en fourreau de sabre : analyse video-endoscopique, correlations morphologiques et fonctionnelles." Angers, 1992. http://www.theses.fr/1992ANGE1020.
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Pérez, Ràfols Ignasi. "The cross-correlation among tracers of the underlying large-scale mass distribution in the universe." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/400493.
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The work presented in this Ph.D. thesis is mostly related to the measurement and interpretation of the cross-correlation of different species. This is achieved using spectroscopic data from the BOSS survey of which I am a member. Along the thesis I will be visiting the cross-correlation of different tracers. This tracers include the Mg II absorbers, the Damped Lyα Systems (DLA), the Lyα forest, the quasars and the galaxies. Save the last mentioned, all tracers are measured from quasar spectra from BOSS. The galaxies are taken from the BOSS CMASS catalogue.
The first cross-correlation I address is that of Mg II absorbers with CMASS galaxies. I present a new method for measuring the equivalent width of metal absorbers, developed in collaboration with Britt Lundgren and Jordi Miralda- Escud´e, and I apply it to the absorption doublet.
Then I shift my attention to the DLAs and the Ly forest. Since the Lyα forest autocorrelation has already been studied (see e.g. Delubac et al. 2015; Blomqvist et al. 2015), the Lyα parameters are well constrained. I use those constraints to provide more accurate measurements of the DLA bias when analysing the cross-correlation of DLAs with the Lyα forest. The study has been made in collaboration with Andreu Font-Ribera, Nicol´as Busca, and Jordi Miralda-Escud´e. In particular, the estimator for the cross-correlation was orig- inally developed by Nicol´as Busca for the analysis of the Lyα autocorrelation and later adapted to the measurement of the cross-correlation.
The first two cross-correlations studied and more importantly their interpre- tation, are mostly focused on large scales, where the linear theory is valid. At smaller scales, non-linear effects start to kick in and the linear approximation is no longer valid. I measure the cross-correlation of quasars with the Lyα forest, and focus on the small scales effects. I show that a contamination from metals is clearly present in the cross-correlation. Also, I discuss some of the possible non-linear effects and give a simple theoretical model to explain the effect that quasar radiation can have in the surrounding hydrogen clouds.<br>El treball fet en aquesta tesi doctoral es basa principalment en la mesura i interpretació de la correlació creuada entre diferents traçadors. Els traçadors emprats en aquesta tesi són les galàxies del catàleg CMASS, els quàsars del catàleg de Baryon Oscillations Spectroscopic Survey (BOSS), els sistemes absorbidors de MgII, el bosc de Lya i els sistemes Lya esmorteïts o DLAs (els tres darrers són sistemes absorbidors detectats als espectres dels quàsars).
El projecte BOSS és un dels quatre projectes que han composat la tercera fase de la col·laboració de l’Sloan Digital Sky Survey (SDSS) el principal objectiu del qual ha estat la detecció del senyal de les oscil·lacions acústiques dels barions (BAO, de l’anglès Baryon Acoustic Oscillations) i que ha estat recollint espectres electromagnètics de quàsars i galàxies des de la tardor de 2013 fins a la
tardor de 2014.
L’estructura d’aquesta tesi es divideix en tres capítols que fan referència a l’estudi de diferents traçadors. En el capítol ì els traçadors emprats són les galàxies de CMASS i els sistemes absorbidors de MgII; en el capítol 3, els DLA i el bosc de Lya, i en el capítol 5, els quàsars i el bosc de Lya. A més la tesi compta amb una introducció en català, una altra en anglès i un compendi de les conclusions obtingudes.
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Karis, Tomas. "Correlation between Track Irregularities and Vehicle Dynamic Response Based on Measurements and Simulations." Licentiate thesis, KTH, Farkost och flyg, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-228056.
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Deviations from the design track geometry are called track irregularities, which are a main excitation mechanism in the track–vehicle dynamic system, and very important to monitor and maintain to have trac on a line run safely and comfortably. Especially during vehicle acceptance testing, it is important that a new vehicle behaves close to design predictions and within limit values, thus it is important to be able to describe track irregularities in a consistent way. There are several methods which quantify the eects track irregularities have on a vehicle while running along the track. Most common is analyse standard deviations and percentiles and maximum values over sections with pre-defined length. However, these quantities do not correlate well with the vehicle dynamic response, e.g. two track sections with similar maxima and standard deviations can result in very dierent response of the vehicle. To improve the correlation between track irregularities and vehicle re- sponse measures, it is recommended by past research to use multiple regres- sion analysis to take e.g. vehicle speed and track curvature into account as well. Other methods range from derivatives of track irregularities, via trans- fer functions and vehicle filters to neural networks. Common for all these methods are that there is either still slight inconsistencies in the results or that they are tailored for certain vehicle types on specific lines. As a result, the preferred method to evaluate track irregularities is still to use standard deviations. In this thesis, data from three vehicles in two measurement campaigns is evaluated using a single degree of freedom model as inspiration to break down the path from track to vehicle into several steps. A weak link in these steps is identified, which shows significantly lower correlation coecients than the other steps. The weak link is the step from vertical track irregularity second spatial derivative to vertical axle box acceleration divided by the squared vehicle speed. A variable wavelength range Dx is introduced, as an alternative to the common D1 (3–25 m), D2 (25–70 m) and D3 (70–150 m) wavelength ranges. Its wavelength range corresponds to the vehicle response band-pass filter frequencies and is thus speed dependent. Simulations are also carried out to investigate the weak link and for the possibility to vary parameters that cannot be changed during on-track mea- surements. A multi-body system model of the passenger coach Bim 547.5 is used, together with recorded track data and vehicle speed from the on-track measurements. The varied parameters have rather low sensitivity and aect results to a small extent. Most impact has the randomly varying vertical track stiness which aects the vertical wheel–rail forces and axle box accelerations. In future work, it should be explored if it is possible – and in such case how – to separate the eects of varying track stiness from the track irreg- ularities. This to better understand when a vehicle response is linked more to the track irregularities or to the track flexibility. The weak link identified in the steps from track to vehicle should also be further explored, perhaps by extending the underlying model or evaluate a dierent set of measurements.<br>Spårlägesfel är avvikelser från den nominella spårgeometrin. De är en vik- tig excitationsmekanism i det dynamiska system som bana och fordon utgör och är viktiga att övervaka och åtgärda för att trafiken ska kunna flyta sä- kert och komfortabelt. Eftersom det vid mätningar för typgodkännande av fordon är viktigt att fordonet beter sig som förväntat och inom gränsvärden, är det viktigt att kunna beskriva spårlägesfel på ett sätt som är konsekvent och motsvarar hur fordonet ”känner av” dem. Det finns ett flertal olika metoder som kvantifierar de eekter spårläges- fel har på ett fordon som rör sig längs ett spår. Vanligast är att använda standardavvikelser, percentiler och maxvärden från spårsektioner med för- definierad längd. Dessa storheter korrelerar dock inte väl med den dynamiska fordonsresponsen, till exempel kan två spårsektioner med liknande maxvärden och standardavvikelse resultera i väldigt olika fordonsrespons. För att förbättra korrelationen mellan storheter för spårlägesfel och for- donsrespons rekommenderar tidigare forskning att använda multipel regres- sionsanalys för att även ta hänsyn till till exempel fordonets hastighet eller spårets kurvatur. Det finns flera alternativa metoder, till exempel derivator av spårlägesfel, överföringsfunktioner och fordonsfilter eller neurala nätverk. Generellt ger dock dessa metoder antingen fortfarande en viss osäkerhet i resultaten, eller så är de anpassade för vissa fordonstyper på enstaka järn- vägslinjer. Sammantaget är resultatet att den metod som föredras för att utvärdera spårlägesfel, fortfarande baseras på standardavvikelser. I den här avhandlingen används en enfrihetsgradsmodell som inspiration för att bryta ner excitationsvägen från spår till fordon i ett antal steg, som sedan undersöks genom att utvärdera mätdata från tre fordon i två forsk- ningsprojekt. En svag länk bland stegen identifieras, vilken visar signifikant lägre korrelationsvärde än övriga steg. Den svaga länken är steget från spatial andraderivata av spårlägesfel till axelboxacceleration dividerat med fordons- hastigheten i kvadrat. Ett variabelt våglängdsområde Dx introduceras som ett alternativ till de vanligt förekommande D1 (3–25 m), D2 (25–70 m) och D3 (70–150 m). Det variabla våglängdsområdet motsvarar de frekvenser som används för utvärdering av fordonsrespons och är därmed hastighetsberoende. Vidare används simuleringar för att undersöka den svaga länken och för möjligheten till parametervariationer. En flerkroppsmodell (MBS-modell) av passagerarvagnen Bim 547.5 används tillsammans med uppmätta data för spår och fordonshastighet. De parametrar som varieras visar sig ha låg käns- lighet och påverkar resultaten i liten utsträckning. Störst inverkan har den slumpmässigt varierande vertikala spårstyvheten, vilken påverkar de vertikala hjul–rälkrafterna och axelboxaccelerationerna. Fortsatt forskning bör undersöka om det är möjligt att – och i så fall hur – separera eekten av varierande spårstyvhet och spårlägesfel. Detta kan ge bättre förståelse för om fordonsrespons kopplar mer till spårlägesfelen eller till spårflexibiliteten. Den svaga länken som identifierats bör också undersö- kas ytterligare, förslagsvis genom att utöka den bakomliggande modellen eller analysera annan mätdata.<br><p>QC 20180517</p>
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Karis, Tomas. "Track Irregularities for High-Speed Trains : Evaluation of their correlation with vehicle response." Thesis, KTH, Järnvägsteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156640.
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Machado, Gabriel Gonzalo. "Correlations between geological track and bentonite quality in the mercosur trade block." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-01032019-090527/.
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It is undoubtable that the geological path followed by a bentonite natural occurrence, will set a birthmark in terms of grade and quality, the former being expressed in terms of mineralogical composition, smectite content and other aspects derived from the bulk sample characterization, and the latter being expressed in terms of the crystal chemistry of smectite species present and derived from the clay size fraction observations. The influence of parent rock composition, genesis mode, burial history and preservation conditions after alteration, would set the fingerprint on bentonite and inherent structural features in smectites species, which determines potential industrial and scientific uses. The following thesis aims to evaluate physicochemical properties of 12 bentonite samples, coming from the six most relevant bentonite bearing geological areas located in the Mercosur economic block (Argentina, Brazil and Uruguay)1; in order to stablish possible correlations between distinctive geological contexts, and observed characteristics from whole rock providing information regarding grade and the clay size fraction will provide information regarding quality. Mineralogical composition corroborated the tendency to be influenced by the geochemical signature of parent rock firstly, and secondly genesis mode (probably due to lack of information in this aspect). Age, on the other hand, could on the contrary, be a misleading parameter; in the sense that preservation is not necessarily time dependent. Poor grade and the presence of mixed layers and accessory clay mineral phases (mostly kaolinite but also I/S, illite and pyrophyllite) appear to be associated with hydrothermal to sedimentary alteration modes, higher grade bentonites with tendency to yield extreme relative values of physical properties, measured in layer charge, swelling and organic sorption, were found in association to diagenetic bentonites. In terms of smectite species, all members found belong to the montmorillonite-beidellite series, and rhyolitic to dacitic volcanic source, tends to alter into the montmorillonite end member of the series; and accordingly, basic precursors (basalt) to intermediary (andesite), show a tendency to alter into transitional up to beidellite Fe-rich end members of the series respectively. To evaluate implications on possible applications, crystal chemistry was evaluated over the <1 µm size fractions by XRD and XRF along with other accessory techniques (FTIR, SEM-EDS and size distribution analysis), finding a clear trend, between layer charge relative magnitude, as a function organo-sorption behavior; by simply evaluating the d-001 XRD reflections on oriented slides after first K-saturation and sequential ethylene glycol solvation, against (CTAC)-montmorillonite d001 basal reflection , being inversely proportional and resulting in a broad variety Organophilic XRD patterns, showing distinctive expandability behavior ranging from 15,2 Å To 21,68 Å. As a function of alkyl chain size and the known sorption isotherm, basically all patterns of organo-compound sorption where observed, going from lateral monolayer to paraffin type sorption behavior.<br>É inquestionável que o caminho geológico seguido pela ocorrência natural de bentonitas, irá indicar suas características em termos de teor e qualidade, o primeiro expressado em termos da composição mineralógica, conteúdo de esmectitas e outros aspectos derivados da caracterização da amostra cabeça, e o Segundo expressado em termos da química cristalina das espécies esmectiticas presentes e derivado das observações na fracção de tamanho de argilas. A influência da composição da rocha parental, sua gênese, o histórico de soterramento e das condições de preservação após processo de alteração, determinaria a \"impressão digital\" da bentonita e as características estruturais inerentes as espécies de esmectitas, que determina os usos potenciais e industriais. O objetivo deste trabalho é avaliar propriedades físico-químicas de 12 amostras de bentonitas, provenientes de seis áreas geológicas mais relevantes localizadas no bloco econômico do Mercosul (Argentina, Brasil e Uruguai)2; o intuito é estabelecer possíveis correlações entre contextos geológicos distintos e características observadas em rochas (teor) e fração de tamanho de argila (qualidade). A composição mineralógica corroborou a tendência de ser influenciada pela assinatura geoquímica da rocha parental em primeiro lugar, e em segundo lugar, por sua gênese (provavelmente devido à falta de informação neste aspecto). A idade, por outro lado, poderia, pelo contrário, ser um parâmetro ilusório, no sentido de que a conservação não é necessariamente dependente do tempo. Baixo teor e baixo conteúdo de esmectita, assim como a presença de camadas mistas e fases argilosas acessórias (principalmente caulinita, mas também I/S, ilita e pirofilita) parecem estar associadas aos modos de alteração hidrotermal a sedimentar, bentonita de alto teor, com tendência a produzir valores relativos extremos de propriedades físicas, medidas em carga foliar, inchamento e sorção orgânica, foram encontradas em associação com bentonitas diagenéticas. Em termos de espécies de esmectitas, todos os membros identificados como pertencentes a série montmorilonita-beidellita, e a fonte vulcânica riolítica a dacítica, tendem a se alterar para membro final da série montmorilonita, e consequentemente, os precursores básicos (basalto) e intermediário (andesito), mostram tendência a se alterar em membros transitórios e beidellita ricos em ferro, respectivamente. Para avaliar as implicações nas possíveis aplicações, a química cristalina foi avaliada nas frações abaixo de 1 µm por DRX e FRX, juntamente de outras técnicas de apoio (FTIR, MEV/EDS e distribuição granulométrica), encontrando uma tendência clara entre a magnitude relativa da carga da camada, como uma função do comportamento da organo-absorção, simplesmente avaliando as reflexões basais em d-001 a partir de lâminas orientadas após a primeira saturação em potássio e solvatação sequencial de etileno glicol, contra reflexão em d-001 da (CTAC)-montmorilonita, sendo inversamente proporcional e resultando em uma ampla variedade de padrões de DRX organofílico, mostrando um comportamento de expansibilidade distinto, variando de 15,2 Å a 21,68 Å. Como função do tamanho da cadeia carbônica e da isoterma de sorção conhecida, basicamente todos os padrões de sorção de organo-compostos foram observados, partindo do comportamento de sorção do tipo monocamada lateral para sorção tipo parafina.
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Domart, Florelle. "Nano-imagerie corrélative de fluorescence X synchrotron et de super résolution des métaux et des protéines dans les synapses de neurones d’hippocampe." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0185/document.
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Les éléments chimiques métalliques tels que Fe, Cu ou Zn sont présents en quantité infime dans le cerveau. Le rôle de ces métaux traces dans les fonctions neuronales, telles que la transmission synaptique et les processus de mémorisation, reste encore largement à élucider. En outre, une dyshoméostasie des métaux est retrouvée dans de nombreuses neuropathologies, telles que maladie d’Alzheimer, de Parkinson ou sclérose latérale amyotrophique. Les mécanismes d’interaction des métaux traces au niveau neuronal sont difficiles à décrire faute de méthodes analytiques possédant une résolution et une sensibilité adaptées pour en déterminer la distribution à l’échelle synaptique. La spectrométrie de fluorescence-X synchrotron (SXRF) est une méthode d’analyse chimique multi-élémentaire permettant de décrire la distribution quantitative de ces éléments à l’échelle subcellulaire avec une résolution nanométrique (40 nm avec la ligne ID16A du synchrotron ESRF) et une très haute sensibilité. Afin d’interpréter avec précision les résultats d’imagerie chimique, nous avons développé un protocole pour corréler l’imagerie nano-SXRF avec la microscopie super résolutive de déplétion par émission stimulée (STED) permettant ainsi la corrélation des distributions des métaux avec celle de protéines cibles en super résolution. Nous avons marqué les microtubules et l’actine-F de neurones primaires d’hippocampe de rat puis imagé le cytosquelette par microscopie STED avant de déterminer par spectrométrie SXRF les distributions des éléments P, S, Fe, Cu et Zn. Nous avons ainsi mis en évidence la colocalisation du Zn et des microtubules au niveau dendritique ainsi qu’une localisation du Cu essentiellement dans le cou des épines dendritiques riches en F-actine, et une distribution du Fe sous forme de points très localisés dans les dendrites. Ces résultats ont révélé le rôle essentiel du Zn dans l’architecture du cytosquelette des neurones d’hippocampe et la méthode d’imagerie corrélative développée ouvre de nouvelles perspectives pour l’étude des dyshoméostasies des métaux dans les maladies neurodégénératives<br>Metallic chemical elements such as Fe, Cu or Zn are present in minute quantities in the brain. The role of these trace metals in neuronal functions such as synaptic transmission and memory processes remains largely unclear. Moreover, metal dyshomeostasis is found in many neuropathologies, such as Alzheimer’s disease, Parkinson’s or amyotrophic lateral sclerosis. The interaction mechanisms of trace metals at the neuronal level are difficult to describe because of the lack of analytical methods with appropriate resolution and sensitivity to determine metal distribution at the synaptic level. Synchrotron X-ray fluorescence spectrometry (SXRF) is a multielemental chemical analysis method for describing the quantitative distribution of these elements at the sub-cellular scale with a nanometric resolution (40 nm at ESRF beamline ID16A ) and a very high sensitivity. In order to accurately interpret chemical imaging results, we have developed a protocol to correlate nano-SXRF imaging with stimulated emission depletion super resolution microscopy (STED), allowing the correlation of metal distribution and that of target proteins in super resolution. We labeled microtubules and F-actin of primary rat hippocampal neurons and imaged the cytoskeleton by STED microscopy before determining the distributions of P, S, Fe, Cu and Zn by SXRF spectrometry. We evidenced the colocalization of Zn and microtubules at the dendritic level and a localization of Cu mainly in the neck of dendritic spines rich in F-actin, and a distribution of Fe in the form of very localized points in the dendrites. These results highlight the crucial role of Zn in cytoskeleton architecture of hippocampal neurons and the developed correlative imaging method opens new perspectives for the study of metal dyshomeostasis in neurodegenerative diseases
Books on the topic "Correlation tracker"
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Fritz, W. H. Lithology, trace fossils, and correlation of Precambrian-Cambrian boundary beds, Cassiar Mountains, North-Central British Columbia. Energy, Mines and Resources Canada, 1985.
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United States. National Aeronautics and Space Administration., ed. Fuzzy interference enhanced information recovery from digital PIV using cross-correlation combined with particle tracking. National Aeronautics and Space Administration, 1995.
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Harrison, Edwin F. ATLAS-3 correlative measurement opportunities with UARS and surface observations. National Aeronautics and Space Administration, Langley Research Center, 1995.
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Harrison, Edwin F. ATLAS-3 correlative measurement opportunities with UARS and surface observations. National Aeronautics and Space Administration, Langley Research Center, 1995.
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Harrison, Edwin F. ATLAS-3 correlative measurement opportunities with UARS and surface observations. National Aeronautics and Space Administration, Langley Research Center, 1995.
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Harrison, Edwin F. ATLAS-3 correlative measurement opportunities with UARS and surface observations. National Aeronautics and Space Administration, Langley Research Center, 1995.
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Pohl, Christa. Wechselbeziehungen zwischen Spurenmetallkonzentrationen (Cd, Cu, Pb, Zn) im Meerwasser und in Zooplanktonorganismen (Copepoda) der Arktis und des Atlantiks =: Correlations between trace metal concentrations (Cd, Cu, Pb, Zn) in seawater and zooplankton organisms (Copepoda) of the Arctic and Atlantic Ocean. Alfred-Wegener-Institut für Polar- und Meeresforschung, 1992.
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Nevskiy, Sergey, Aleksandr Hudokormov, Mihail Pokidchenko, et al. The history of the concept of social market economy in Germany. INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1703180.
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The monograph traces the history of the development of German neoliberal economic thought from the origins of the Freiburg School in the 1930s to the first results of the practical implementation of the concept of a social market economy in West Germany in the late 1940s-early 1960s. The author demonstrates the broad historical context of the development of German ideas about the theory and practice of the policy of order (Ordnungstheorie und Ordnungspolitik), shows the features of the formation and spread of the scientific and intellectual economic tradition in Germany, as well as beyond its borders, starting with the birth of the German historical school and the perception of its heritage by Russian socio-economic thought in the second half of the XIX — early XX century and ending with the practical implementation of the concept of order of the Freiburg school and the correlation of its ideological and spiritual and moral foundations with the social teaching of Catholicism and liberalism of Friedrich von Hayek. Special attention is paid to some controversial issues of the formation of the theory of ordoliberalism during the period of national socialism and the problems of the social market economy in modern Germany.
 The book is intended to fill the shortage of specialized scientific literature on relevant issues and to acquaint the Russian reader, primarily students, teachers and researchers, with the variety of ideological and scientific-theoretical foundations of the socio-economic system of the post-war Germany.
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Hansen, James H. Correlation of Forces. Praeger Publishers, 1987. http://dx.doi.org/10.5040/9798216962984.
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There are a number of books on the Soviet armed forces that describe weapons and composition. Here is the most broad ranging, detailed treatment of the subject to date. Correlation of Forces traces the development of the Soviet military over the past forty years, decade by decade. In addition to weaponry and composition, this authoritative reference covers leadership and geopolitical ebb and flow--including current troop movements in the Third World and along the Soviet-Sino border. Author Hansen has also selected fourteen years of critical importance to the development of the Soviet military, assesses the events of those years, and analyzes their significance.
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Staff, Houghton Mifflin Company. Houghton Mifflin Science California: Ind Bk Lv2 Chp2 Challenge the Animal Trackers. Houghton Mifflin Harcourt Publishing Company, 2006.
Find full textBook chapters on the topic "Correlation tracker"
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Rimmele, Th, and O. von der Lühe. "A Correlation Tracker for Solar Fine Scale Studies." In Reviews in Modern Astronomy. Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-75183-7_9.
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Shao, Jingjing, Lei Xiao, and Zhongyi Hu. "Adaptive Model Updating Correlation Filter Tracker with Feature Fusion." In Pattern Recognition and Computer Vision. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60639-8_22.
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Zhou, Bin, Xin Liu, and Bineng Zhong. "A Cooperative Tracker by Fusing Correlation Filter and Siamese Network." In Pattern Recognition and Computer Vision. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60639-8_56.
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Zhang, Dengzhuo, Donglan Cai, Yun Gao, Hao Zhou, and Tianwen Li. "Correlation Filters Tracker Based on Two-Level Filtering Edge Feature." In Communications in Computer and Information Science. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7299-4_44.
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Li, Yang, and Jianke Zhu. "A Scale Adaptive Kernel Correlation Filter Tracker with Feature Integration." In Computer Vision - ECCV 2014 Workshops. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16181-5_18.
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You, Shaoze, Hua Zhu, Menggang Li, Lei Wang, and Chaoquan Tang. "Long-Term Real-Time Correlation Filter Tracker for Mobile Robot." In Intelligent Robotics and Applications. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27526-6_22.
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Zhang, Fei, and Shiping Ma. "Correlation Filter RGB-T Tracker with Modality and Channel Reliability." In Lecture Notes in Electrical Engineering. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6963-7_61.
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Xiong, Ruoyan, Shang Zhang, Yang Zou, and Yue Zhang. "SRCFT: A Correlation Filter Tracker with Siamese Super-Resolution Network and Sample Reliability Awareness for Thermal Infrared Target Tracking." In Lecture Notes in Computer Science. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5612-4_13.
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Lukežič, Alan, Luka Čehovin Zajc, Tomáš Vojíř, Jiří Matas, and Matej Kristan. "FuCoLoT – A Fully-Correlational Long-Term Tracker." In Computer Vision – ACCV 2018. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20890-5_38.
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Grohs, Michael, and Jana-Rebecca Rehse. "Attribute-Based Conformance Diagnosis: Correlating Trace Attributes with Process Conformance." In Lecture Notes in Business Information Processing. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-27815-0_15.
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AbstractAn important practical capability of conformance checking is that organizations can use it to alleviate potential deviations from the intended process behavior. However, existing techniques only identify these deviations, but do not provide insights on potential explanations, which could help to improve the process. In this paper, we present attribute-based conformance diagnosis (ABCD), a novel approach for correlating process conformance with trace attributes. ABCD builds on existing conformance checking techniques and uses machine learning techniques to find trace attribute values that potentially impact the process conformance. It creates a regression tree to identify those attribute combinations that correlate with higher or lower trace fitness. We evaluate the explanatory power, computational efficiency, and generated insights of ABCD based on publicly available event logs. The evaluation shows that ABCD can find correlations of trace attribute combinations with higher or lower fitness in a sufficiently efficient way, although computation time increases for larger log sizes.
Conference papers on the topic "Correlation tracker"
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Dang, Tuan Phuong, Adnan F. Alhaj Hasan, and Talgat R. Gazizov. "Performance Comparison of Correlation Coefficient Based Trackers for Characteristic Mode Analysis." In 2024 International Conference on Actual Problems of Electron Devices Engineering (APEDE). IEEE, 2024. http://dx.doi.org/10.1109/apede59883.2024.10715817.
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Rimmele, Thomas R., Oskar von der Luehe, P. H. Wiborg, A. Lee Widener, Richard B. Dunn, and G. Spence. "Solar feature correlation tracker." In San Diego, '91, San Diego, CA, edited by Mark A. Ealey. SPIE, 1991. http://dx.doi.org/10.1117/12.48806.
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Venkateswarlu, Ronda, Meng H. Er, Yu H. Gan, and Yew C. Fong. "Area-correlation tracker with improved reliability." In AeroSense '97, edited by Michael K. Masten and Larry A. Stockum. SPIE, 1997. http://dx.doi.org/10.1117/12.277189.
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Jiang, Aimin, Sen Wang, and Shengzheng Jin. "Simulation system for a correlation tracker." In Photonics Asia 2002, edited by Wenhan Jiang and Robert K. Tyson. SPIE, 2002. http://dx.doi.org/10.1117/12.481696.
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Wong, Sebastien, and Brendan Hennessy. "The Advanced Correlation Tracker in Real-Time." In 2008 4th Southern Conference on Programmable Logic (SPL). IEEE, 2008. http://dx.doi.org/10.1109/spl.2008.4547751.
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Tang, Zhao-Qian, and Kaoru Arakawa. "Kernel Correlation Filter Tracker via Adaptive Model." In 2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS). IEEE, 2018. http://dx.doi.org/10.1109/ispacs.2018.8923187.
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Arun Singh, Pradeep Kumar Gautam, and Maheshkumar P. Jagtap. "Multicore DSP implementation of adaptive correlation tracker." In TENCON 2008 - 2008 IEEE Region 10 Conference (TENCON). IEEE, 2008. http://dx.doi.org/10.1109/tencon.2008.4766773.
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Pu, Lei, Xinxi Feng, Zhiqiang Hou, Wangsheng Yu, Yufei Zha, and Sugang Ma. "Deep Correlation Filter based Real-Time Tracker." In 2019 22th International Conference on Information Fusion (FUSION). IEEE, 2019. http://dx.doi.org/10.23919/fusion43075.2019.9011354.
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Jiang, Aimin, Binxun Ye, Jinghao Sun, and Guoxiang Ai. "Correlation tracker system for Space Solar Telescope." In Astronomical Telescopes and Instrumentation, edited by Peter L. Wizinowich and Domenico Bonaccini. SPIE, 2003. http://dx.doi.org/10.1117/12.457023.
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Li, Yang, Zhan Xu, and Jianke Zhu. "CFNN: Correlation Filter Neural Network for Visual Object Tracking." In Twenty-Sixth International Joint Conference on Artificial Intelligence. International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/309.
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Albeit convolutional neural network (CNN) has shown promising capacity in many computer vision tasks, applying it to visual tracking is yet far from solved. Existing methods either employ a large external dataset to undertake exhaustive pre-training or suffer from less satisfactory results in terms of accuracy and robustness. To track single target in a wide range of videos, we present a novel Correlation Filter Neural Network architecture, as well as a complete visual tracking pipeline, The proposed approach is a special case of CNN, whose initialization does not need any pre-training on the external dataset. The initialization of network enjoys the merits of cyclic sampling to achieve the appealing discriminative capability, while the network updating scheme adopts advantages from back-propagation in order to capture new appearance variations. The tracking pipeline integrates both aspects well by making them complementary to each other. We validate our tracker on OTB-2013 benchmark. The proposed tracker obtains the promising results compared to most of existing representative trackers.
Reports on the topic "Correlation tracker"
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Reid, M. S., X. Wang, N. Utting, and C. Jiang. Comparison of water chemistry of hydraulic-fracturing flowback water from two geological locations at the Duvernay Formation, Alberta, Canada. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329276.
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We analyzed and compared the water chemistry between 17 Fox Creek region samples, each from a different well, and 23 Three Hills region samples from a single well. Overall, the two regions were similar in chemical composition but showed small differences in some lower abundance dissolved elements. Additionally, we investigated changes in water chemistry of FPW over time from a single well. The majority of water quality parameters and water chemistry remained constant over the 7-month sampling time. Major ion chemistry showed increasing concentrations of Ca and Mg, and a decreasing concentration of SO4. Several trace elements also showed small trends of both increasing and decreasing concentrations over time. There was a strong correlation between Ca and Mg concentrations in both the Fox Creek region samples and Three Hills region samples, which is an indication of the mixing of formation water. However, the correlation between B and Sr was different among two region samples, which is likely due to the delayed mixing of formation water with the fracturing fluids during the flowback at different time periods of post fracturing. Likewise, Fox Creek region samples showed correlations between concentrations of Cl and Ca, Na and Ca, and Na and Mg, but these correlations were not seen in the Three Hills region samples. Geochemical modeling demonstrates that there are potential scales formed in the flowback water, but most of the minerals are still in the dissolution state in the formation. Stable isotopic analysis confirmed the mixing of injection water and the formation water.
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Lammert, Michael P., Kenneth J. Kelly, and Janet Yanowitz. Correlations of Platooning Track Test and Wind Tunnel Data. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1422885.
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Fritz, W. H., and T. P. Crimes. Lithology, trace fossils and correlation of Precambrian-Cambrian boundary beds, Cassiar Mountains, north-central British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120142.
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Russo, David, and William A. Jury. Characterization of Preferential Flow in Spatially Variable Unsaturated Field Soils. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7580681.bard.
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Preferential flow appears to be the rule rather than the exception in field soils and should be considered in the quantitative description of solute transport in the unsaturated zone of heterogeneous formations on the field scale. This study focused on both experimental monitoring and computer simulations to identify important features of preferential flow in the natural environment. The specific objectives of this research were: (1) To conduct dye tracing and multiple tracer experiments on undisturbed field plots to reveal information about the flow velocity, spatial prevalence, and time evolution of a preferential flow event; (2) To conduct numerical experiments to determine (i) whether preferential flow observations are consistent with the Richards flow equation; and (ii) whether volume averaging over a domain experiencing preferential flow is possible; (3) To develop a stochastic or a transfer function model that incorporates preferential flow. Regarding our field work, we succeeded to develop a new method for detecting flow patterns faithfully representing the movement of water flow paths in structured and non-structured soils. The method which is based on application of ammonium carbonate was tested in a laboratory study. Its use to detect preferential flow was also illustrated in a field experiment. It was shown that ammonium carbonate is a more conservative tracer of the water front than the popular Brilliant Blue. In our detailed field experiments we also succeeded to document the occurrence of preferential flow during soil water redistribution following the cessation of precipitation in several structureless field soils. Symptoms of the unstable flow observed included vertical fingers 20 - 60 cm wide, isolated patches, and highly concentrated areas of the tracers in the transmission zone. Soil moisture and tracer measurements revealed that the redistribution flow became fingered following a reversal of matric potential gradient within the wetted area. Regarding our simulation work, we succeeded to develop, implement and test a finite- difference, numerical scheme for solving the equations governing flow and transport in three-dimensional, heterogeneous, bimodal, flow domains with highly contrasting soil materials. Results of our simulations demonstrated that under steady-state flow conditions, the embedded clay lenses (with very low conductivity) in bimodal formations may induce preferential flow, and, consequently, may enhance considerably both the solute spreading and the skewing of the solute breakthrough curves. On the other hand, under transient flow conditions associated with substantial redistribution periods with diminishing water saturation, the effect of the embedded clay lenses on the flow and the transport might diminish substantially. Regarding our stochastic modeling effort, we succeeded to develop a theoretical framework for flow and transport in bimodal, heterogeneous, unsaturated formations, based on a stochastic continuum presentation of the flow and a general Lagrangian description of the transport. Results of our analysis show that, generally, a bimodal distribution of the formation properties, characterized by a relatively complex spatial correlation structure, contributes to the variability in water velocity and, consequently, may considerably enhance solute spreading. This applies especially in formations in which: (i) the correlation length scales and the variances of the soil properties associated with the embedded soil are much larger than those of the background soil; (ii) the contrast between mean properties of the two subdomains is large; (iii) mean water saturation is relatively small; and (iv) the volume fraction of the flow domain occupied by the embedded soil is relatively large.
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Naibert, T. J., and Alicja Wypych. Regional correlation of metamorphic rocks in the Ladue River-Mount Fairplay map area using trace-element geochemistry. Alaska Division of Geological & Geophysical Surveys, 2021. http://dx.doi.org/10.14509/30737.
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Ivanova, Iryna, and Elena Afanasieva. MODEL OF INTERACTION BETWEEN ADVERTISING, PR AND JOURNALISM. Ivan Franko National University of Lviv, 2021. http://dx.doi.org/10.30970/vjo.2021.49.11060.
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The article is an overview of the journalism – PR – advertising relationship at the terminological, empirical-analytical and practical levels. It traces the state of the discussion of these correlations in the post-soviet media such as Ukraine. The study describes that domesticating the importance of the appropriate partnership between the three communication technologies. The thesis is that journalism, advertising and PR create a mutual connection that takes place in an atmosphere of PR and advertising permissiveness and deepens with the development of digitalization, Social network development. The present research is based on a comprehensive approach. The inductive and deductive methods are adopted to discuss theoretical materials, and the interdisciplinary research method is used to detect PR-specific features as a philosophy of a new journalism project. The interpretive approach, usually employed to analyze media text as a complex synthetic structure, was also taken into consideration. The analytical method application identified the modern means of substantiating the ideological, esthetical and informative value of brand journalism and spin doctor. The innovative character of modern media as a behavioral strategy in the advertising and PR industry consists in the fact that it is a form of creative production and behavior rather than adapting a specific communication situation. The article examines the main directions of contemporary interactions between PR, advertising and journalism as a media content creation. In this context, it is asserted that advertising, journalism and PR activities can contribute to the creation of media content. At some point, good media content is achieved not only as a result of this competition but also from the correlation between PR, advertising and journalism.
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Cavalli, Nicolò. Future orientation and fertility: cross-national evidence using Google search. Verlag der Österreichischen Akademie der Wissenschaften, 2020. http://dx.doi.org/10.1553/populationyearbook2020.res06.
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Using digital traces to investigate demographic behaviours, I leverage in this paper aggregated web search data to develop a Future Orientation Index for 200 countries and territories across the world. This index is expressed as the ratio of Google search volumes for ‘next year’ (e.g., 2021) to search volumes for ‘current year’ (e.g., 2020), adjusted for country-level internet penetration rates. I show that countries with lower levels of future orientation also have higher levels of fertility. Fertility rates decrease quickly as future orientation levels increase; but at the highest levels of future orientation, this correlation flattens out. Theoretically, I reconstruct the role that varying degrees of future orientation might play in fertility decisions by incorporating advances in behavioural economics into a traditional quantity-quality framework à la Becker.
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Young, Brianna. Testing the Correlation of Trace Element Characteristics with the Petrology and Temperature of Eruption of mid-Miocene Rhyolites in Eastern Oregon. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.7394.
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Brenan, J. M., K. Woods, J. E. Mungall, and R. Weston. Origin of chromitites in the Esker Intrusive Complex, Ring of Fire Intrusive Suite, as revealed by chromite trace element chemistry and simple crystallization models. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328981.
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To better constrain the origin of the chromitites associated with the Esker Intrusive Complex (EIC) of the Ring of Fire Intrusive Suite (RoFIS), a total of 50 chromite-bearing samples from the Black Thor, Big Daddy, Blackbird, and Black Label chromite deposits have been analysed for major and trace elements. The samples represent three textural groups, as defined by the relative abundance of cumulate silicate phases and chromite. To provide deposit-specific partition coefficients for modeling, we also report on the results of laboratory experiments to measure olivine- and chromite-melt partitioning of V and Ga, which are two elements readily detectable in the chromites analysed. Comparison of the Cr/Cr+Al and Fe/Fe+Mg of the EIC chromites and compositions from previous experimental studies indicates overlap in Cr/Cr+Al between the natural samples and experiments done at &amp;gt;1400oC, but significant offset of the natural samples to higher Fe/Fe+Mg. This is interpreted to be the result of subsolidus Fe-Mg exchange between chromite and the silicate matrix. However, little change in Cr/Cr+Al from magmatic values, owing to the lack of an exchangeable reservoir for these elements. A comparison of the composition of the EIC chromites and a subset of samples from other tectonic settings reveals a strong similarity to chromites from the similarly-aged Munro Township komatiites. Partition coefficients for V and Ga are consistent with past results in that both elements are compatible in chromite (DV = 2-4; DGa ~ 3), and incompatible in olivine (DV = 0.01-0.14; DGa ~ 0.02), with values for V increasing with decreasing fO2. Simple fractional crystallization models that use these partition coefficients are developed that monitor the change in element behaviour based on the relative proportions of olivine to chromite in the crystallizing assemblage; from 'normal' cotectic proportions involving predominantly olivine, to chromite-only crystallization. Comparison of models to the natural chromite V-Ga array suggests that the overall positive correlation between these two elements is consistent with chromite formed from a Munro Township-like komatiitic magma crystallizing olivine and chromite in 'normal' cotectic proportions, with no evidence of the strong depletion in these elements expected for chromite-only crystallization. The V-Ga array can be explained if the initial magma responsible for chromite formation is slightly reduced with respect to the FMQ oxygen buffer (~FMQ- 0.5), and has assimilated up to ~20% of wall-rock banded iron formation or granodiorite. Despite the evidence for contamination, results indicate that the EIC chromitites crystallized from 'normal' cotectic proportions of olivine to chromite, and therefore no specific causative link is made between contamination and chromitite formation. Instead, the development of near- monomineralic chromite layers likely involves the preferential removal of olivine relative to chromite by physical segregation during magma flow. As suggested for some other chromitite-forming systems, the specific fluid dynamic regime during magma emplacement may therefore be responsible for crystal sorting and chromite accumulation.
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Systematic rare plant survey at the Cuyahoga Valley National Park: Final report (public version). National Park Service, 2023. http://dx.doi.org/10.36967/2300360.
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EnviroScience completed a systematic rare plant survey in the Cuyahoga Valley National Park (CUVA). CUVA staff use the visitor use management planning (VUMP) process to draft proposed management zones for the park to track resource degradation and guide management decisions. The VUMP process has identified a critical need for a park-wide rare plant inventory to supplement outdated surveys conducted from 1986 to the early 2000s. This systematic transect-based survey was designed to provide current rare plant data to inform the VUMP process. These updated rare plant data will support the National Park Service (NPS) in their efforts to: ? Prioritize ongoing conservation efforts. ? Support and improve the quality of the VUMP products and validate the proposed management zones. ? Support early stages of Comprehensive River Management Planning. ? Inform ongoing management decisions in sometimes contentious areas of the park. ? Help prioritize ongoing management efforts. Field surveys consisted of 10-meter-wide belt transect surveys conducted throughout all portions of the park. Transects were aligned with previous 400-m transects from the park?s invasive plant survey (Morgan et al. 2018), supplemented by additional parallel transects placed 200m from the original transects. For high priority areas identified by NPS, additional meander surveys were completed to increase the total area surveyed to ten percent of these areas. Meander surveys were often routed to pass through or near historic locations of rare species, ensuring that historic rare plant locations were visited. A total of 98 species and 675 rare plant locations were inventoried during the survey. Of the 23 surveyed management zones, A-P North Sensitive Resources, Virginia Kendall High Value Experience and Blossom Woods Natural zones had the highest number of rare plant records while those zones with fewer records had relatively high population size and densities. Invasive species were dominant in Virginia Kendall High Value Experience and Blossom Woods Natural zones in locations where rare plants were found. Among management zones, no discernible variation in habitat and disturbance-based measures was observed. Most zones were characterized as containing some levels of human disturbance, earthworm infestation and deer browsing effects colocated with rare plants. Correlations among population and species-based parameters did not show any clear positive or negative associations with the exception of a weak positive relationship between areal percent cover of rare species and percent cover of invasive species. Patterns of negative but weak correlations were observed between earthworm infestation, deer browsing and density and cover of rare species. Results from canonical correspondence analyses showed that the vegetation type was one of the most important factors in structuring rare plant assemblages with floodplain and oak dominated habitats showing strong associations with groupings of rare species.