Готові списки джерел за темами / Intrinsic volume

Добірка наукової літератури з теми "Intrinsic volume"

Автор: Grafiati
Опубліковано: 7 липня 2024

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Зміст

  1. Статті в журналах
  2. Дисертації
  3. Книги
  4. Частини книг
  5. Тези доповідей конференцій
  6. Звіти організацій

Статті в журналах з теми "Intrinsic volume":

1

Dedieu, Thomas. "Intrinsic pseudo-volume forms for logarithmic pairs." Bulletin de la Société mathématique de France 138, no. 4 (2010): 543–82. http://dx.doi.org/10.24033/bsmf.2596.

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2

Rice, Roy W., and William J. McDonough. "Intrinsic Volume Changes of Self-propagating Synthesis." Journal of the American Ceramic Society 68, no. 5 (May 1985): C—122—C—123. http://dx.doi.org/10.1111/j.1151-2916.1985.tb15328.x.

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3

Fernández, R., J. Mancebo, Ll Blanch, S. Benito, N. Calaf, and A. Net. "Intrinsic PEEP on static pressure-volume curves." Intensive Care Medicine 16, no. 4 (April 1990): 233–36. http://dx.doi.org/10.1007/bf01705157.

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4

Edelsbrunner, Herbert, and Florian Pausinger. "Approximation and convergence of the intrinsic volume." Advances in Mathematics 287 (January 2016): 674–703. http://dx.doi.org/10.1016/j.aim.2015.10.004.

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5

Budd, Peter M., Neil B. McKeown, and Detlev Fritsch. "Free volume and intrinsic microporosity in polymers." Journal of Materials Chemistry 15, no. 20 (2005): 1977. http://dx.doi.org/10.1039/b417402j.

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6

Bailey, E. Fiona, Yu-Hsien Huang, and Ralph F. Fregosi. "Anatomic consequences of intrinsic tongue muscle activation." Journal of Applied Physiology 101, no. 5 (November 2006): 1377–85. http://dx.doi.org/10.1152/japplphysiol.00379.2006.

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We recently showed respiratory-related coactivation of both extrinsic and intrinsic tongue muscles in the rat. Here, we test the hypothesis that intrinsic tongue muscles contribute importantly to changes in velopharyngeal airway volume. Spontaneously breathing anesthetized rats were placed in a MRI scanner. A catheter was placed in the hypopharynx and connected to a pressure source. Axial and sagittal images of the velopharyngeal airway were obtained, and the volume of each image was computed at airway pressures ranging from +5.0 to −5.0 cmH2O. We obtained images in the hypoglossal intact animal (i.e., coactivation of intrinsic and extrinsic tongue muscles) and after selective denervation of the intrinsic tongue muscles, with and without electrical stimulation. Denervation of the intrinsic tongue muscles reduced velopharyngeal airway volume at atmospheric and positive airway pressures. Electrical stimulation of the intact hypoglossal nerve increased velopharyngeal airway volume; however, when stimulation was repeated after selective denervation of the intrinsic tongue muscles, the increase in velopharyngeal airway volume was significantly attenuated. These findings support our working hypothesis that intrinsic tongue muscles play a critical role in modulating upper airway patency.
7

Liu, Xin Lu, and Ying Wang. "Influence of Internal Noise on Rhythmic Calcium Bursting." Applied Mechanics and Materials 389 (August 2013): 17–20. http://dx.doi.org/10.4028/www.scientific.net/amm.389.17.

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The chemical Langevin method is adopted to study effects of intrinsic noise in calcium bursting oscillations. Results show that by changing the cell volume and thus tuning the strength of internal noise the calcium oscillations show different performance. With the addition of small magnitude intrinsic noise the bursting oscillations do not appear irregular, for moderate volumes relative regular bursting oscillations are observed and internal noise shortens the period of bursting oscillations. As the volume decreases, the level of internal noise increases. Thus, for the volume small enough, the level of internal noise becomes so high that bursting behavior is disrupted, resulting in random oscillations. The most interesting phenomenon is that with the decrease of cell volume the bursting oscillations disappear entirely and only spikes remain. This will be helpful for understanding frequency encoding.
8

Travers, Gavin, José González-Alonso, Nathan Riding, David Nichols, Anthony Shaw, and Julien D. Périard. "Exercise heat acclimation has minimal effects on left ventricular volumes, function and systemic hemodynamics in euhydrated and dehydrated trained humans." American Journal of Physiology-Heart and Circulatory Physiology 319, no. 5 (November 1, 2020): H965—H979. http://dx.doi.org/10.1152/ajpheart.00466.2020.

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This study demonstrates that 10 days of exercise heat acclimation has minimal effects on left ventricular volumes, intrinsic cardiac function, and systemic hemodynamics during prolonged, repeated semirecumbent exercise in moderate heat, where heart rate and blood volume are similar to preacclimation levels. However, progressive dehydration is consistently associated with similar degrees of hyperthermia and tachycardia and reductions in blood volume, diastolic filling of the left ventricle, stroke volume, and cardiac output, regardless of acclimation state.
9

Singh, Ranjodh, Zhiping Zhou, Jamie Tisnado, Sofia Haque, Kyung K. Peck, Robert J. Young, Apostolos John Tsiouris, Sunitha B. Thakur, and Mark M. Souweidane. "A novel magnetic resonance imaging segmentation technique for determining diffuse intrinsic pontine glioma tumor volume." Journal of Neurosurgery: Pediatrics 18, no. 5 (November 2016): 565–72. http://dx.doi.org/10.3171/2016.4.peds16132.

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OBJECTIVE Accurately determining diffuse intrinsic pontine glioma (DIPG) tumor volume is clinically important. The aims of the current study were to 1) measure DIPG volumes using methods that require different degrees of subjective judgment; and 2) evaluate interobserver agreement of measurements made using these methods. METHODS Eight patients from a Phase I clinical trial testing convection-enhanced delivery (CED) of a therapeutic antibody were included in the study. Pre-CED, post–radiation therapy axial T2-weighted images were analyzed using 2 methods requiring high degrees of subjective judgment (picture archiving and communication system [PACS] polygon and Volume Viewer auto-contour methods) and 1 method requiring a low degree of subjective judgment (k-means clustering segmentation) to determine tumor volumes. Lin's concordance correlation coefficients (CCCs) were calculated to assess interobserver agreement. RESULTS The CCCs of measurements made by 2 observers with the PACS polygon and the Volume Viewer auto-contour methods were 0.9465 (lower 1-sided 95% confidence limit 0.8472) and 0.7514 (lower 1-sided 95% confidence limit 0.3143), respectively. Both were considered poor agreement. The CCC of measurements made using k-means clustering segmentation was 0.9938 (lower 1-sided 95% confidence limit 0.9772), which was considered substantial strength of agreement. CONCLUSIONS The poor interobserver agreement of PACS polygon and Volume Viewer auto-contour methods highlighted the difficulty in consistently measuring DIPG tumor volumes using methods requiring high degrees of subjective judgment. k-means clustering segmentation, which requires a low degree of subjective judgment, showed better interobserver agreement and produced tumor volumes with delineated borders.
10

Cuneo, B., S. Hughes, and D. W. Benson. "Heart rate perturbation in chick embryos: a comparison of two methods." American Journal of Physiology-Heart and Circulatory Physiology 260, no. 6 (June 1, 1991): H1864—H1869. http://dx.doi.org/10.1152/ajpheart.1991.260.6.h1864.

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This report compares the effects of two methods of heart rate (HR) perturbation on stroke volume and dorsal aortic flow in the Hamburger-Hamilton stage 24 chick embryo. The sinus venosus was paced at intrinsic HR and at 150, 125, 75, and 50% of intrinsic HR (n = 23). Alternatively, a 1-mm steel probe heated to increase and cooled to decrease HR was applied to the sinus venosus (n = 15). All studies were performed in ovo at 37–38 degrees C. Aortic flow (mm3/S) and stroke volume (mm3/beat) were calculated from aortic velocity, aortic cross-sectional area, and HR. Atrioventricular (AV) inflow velocities were measured during pacing (n = 10) or probe application (n = 11) technique. Dorsal aortic flow was maximum at intrinsic HR and decreased at both increased and decreased HR. Stroke volume decreased proportionally to HR during rate increase. At decreased HR, when AV synchrony was disrupted (pacing), stroke volume was unchanged from intrinsic values. However, when AV synchrony was maintained at decreased HR (cold probe), the embryonic ventricle significantly increased stroke volume.
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Статті в журналах Дисертації Книги

Дисертації з теми "Intrinsic volume":

1

Shpotyuk, Oleh, Valentina Balitska, Mykhaylo Shpotyuk, Yaroslaw Shpotyuk, and Vitaliy Boyko. "On the role of intrinsic free volume in radiation-induced effects in chalcogenide vitreous semiconductors." Thesis, Abstracts of 10th Jubilee International Conference on Radiation in Various Fields of Research, Montenegro, 13-17 june 2022, 2022. https://sci.ldubgd.edu.ua/jspui/handle/123456789/9697.

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2

Walker, Jonathan Keith Earl. "Novel polymers and dendrimers of intrinsic microporosity derived from triptycene and other monomers of high internal free volume." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/55141/.

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The research described in this thesis is largely focused on monomers derived from the triptycene moiety, and their potential to form polymers of intrinsic microporosity (PIMs), organic molecules of intrinsic microporosity (OMIMs) and dendrimers of intrinsic microporosity (DIMs). Triptycene is of particular interest here due to its high internal molecular free volume (IMFV) and previously reported success in the formation of microporous materials - triptycene is in fact the basis of the most microporous PIM reported to date, and the basis of the only reported example of an amorphous molecular microporous material. The work later extends to incorporate other presumed high IMFV moieties based on spirobifluorene and propellane. The research begins by focusing on the synthesis of potentially soluble polymers. They are of interest due to their processability, which when coupled with microporosity, can potentially yield permeable membranes suitable for selective gas separation. There has been much research into PIMs and their corresponding membranes, with particular interest surrounding PIM-1, a polymer formed between a spirobisindane based monomer, and 2,3,5,6-tetrafluoroterephthalonitrile.1 The same nucleophilic aromatic substitution reaction (SNAr) as is used to make PIM-1 is employed throughout this thesis for the formation of final products. The second section of this project focused on the synthesis of network polymers based around triptycene, introducing bitriptycenes, triptycene side groups, and unsymmetrical triptycenes with new functional groups, the main focus on increased surface area. Although highly microporous materials were prepared, no enhancement over previously obtained triptycene polymers was obtained. The third section of the thesis focuses on the synthesis of novel microporous materials termed Organic Molecules of Intrinsic Microporosity (OMIMs) and Dendrimers of Intrinsic Microporosity (DIMs). These are discrete molecules lacking any long range order that cannot pack space efficiently due to their rigid structures, composed of monomer subunits with high IMFV. All materials were analysed for their apparent BET surface areas (N2 adsorption at 77 K), which were in the range 0-700 m2 g"1.
3

Thekkudan, Dennis. "Multidimensional Methods: Applications in Drug-Enzyme Intrinsic Clearance Determination and Comprehensive Two-Dimensional Liquid Chromatography Peak Volume Determination." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/2005.

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The goal of the first project was to evaluate strategies for determining the in vitro intrinsic clearance (CLint) of dextrorphan (DR) as metabolized by the UGT2B7 enzyme to obtain dextrorphan glucuronide (DR-G). A direct injection liquid chromatography-mass spectrometry (LC-MS) method was used to monitor products using the pseudo-first-order (PFO) model. Standard enzymatic incubations were also quantified using LC-MS. These data were fit utilizing both PFO and Michaelis-Menten (MM) models to determine estimates of kinetic parameters. The CLint was determined to be 0.28 (± 0.08) µL/min/mg protein for a baculovirus insect cell-expressed UGT2B7 enzyme. This is the first confirmation that dextrorphan is specifically metabolized by UGT2B7 and the first report of these kinetic parameters. Simulated chromatographic data were used to determine the precision and accuracy in the estimation of peak volumes in comprehensive two-dimensional liquid chromatography (2D-LC). Volumes were determined both by summing the areas in the second dimension chromatograms via the moments method and by fitting the second dimension areas to a Gaussian peak. When only two second dimension signals are substantially above baseline, the accuracy and precision are poor because the solution to the Gaussian fitting algorithm is indeterminate. The fit of a Gaussian peak to the areas of the second dimension peaks is better at predicting the peak volume when there are at least three second dimension injections above the limit of detection. Based on simulations where the sampling interval and sampling phase were varied, we conclude for well-resolved peaks that the optimum precision in peak volumes in 2D separations will be obtained when the sampling ratio is approximately two. This provides an RSD of approximately 2 % for the signal-to-noise (S/N) used in this work. The precision of peak volume estimation for experimental data was also assessed, and RSD values were in the 4-5 % range. We conclude that the poorer precision found in the 2D-LC experimental data as compared to 1D-LC is due to a combination of factors, including variations in the first dimension peak shape related to undersampling and loss in S/N due to the injection of multiple smaller peaks onto the second dimension column.
4

Sigurbjornsson, Omar Freyr. "Vibrational dynamics of icy aerosol particles : phase transitions and intrinsic particle properties." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2795.

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Phase transitions and other intrinsic properties (shape, size, architecture) of molecularly structured aerosol particles are important for understanding their role in planetary atmospheres and for technical applications. By combining bath gas cooling with time resolved mid-infrared spectroscopy and modeling, information is obtained on dynamic processes and intrinsic properties of fluoroform and ethane aerosol particles. The distinct infrared spectral features of fluoroform aerosol particles make it a particularly suitable model system. Homogeneous crystallization rates of the sub-micron sized aerosol particles are determined (JV = 10⁸ - 10¹⁰ cm-³s-¹ or JS = 10³ – 10⁵ cm-²s-¹ at a temperature of T = 78 K), and the controversial question regarding volume versus surface nucleation in freezing aerosols is addressed. It is demonstrated that current state of the art measurements of droplet ensembles cannot distinguish between the two mechanisms due to inherent experimental uncertainties. The evolution of particle shape from spherical supercooled droplets to cube-like crystalline particles and eventually to elongated crystalline particles is recorded and analyzed in detail with the help of vibrational exciton model calculations. Phase behaviour of pure ethane aerosols and ethane aerosols formed in the presence of other ice nuclei under conditions mimicking Titan’s atmosphere provide evidence for the formation of supercooled liquid ethane aerosol droplets, which subsequently crystallize. The observed homogeneous freezing rates (JV = 10⁷ – 10⁹ cm-³s-¹) imply that supercooled ethane could play a similar role in ethane rich regions of Titan’s atmosphere as supercooled water does in the Earth’s atmosphere.
5

Vezzoli, Massimiliano. "Intrinsic kinetics of titania photocatalysis : simplified models for their investigation." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/51574/1/Massimiliano_Vezzoli_Thesis.pdf.

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Even though titanium dioxide photocatalysis has been promoted as a leading green technology for water purification, many issues have hindered its application on a large commercial scale. For the materials scientist the main issues have centred the synthesis of more efficient materials and the investigation of degradation mechanisms; whereas for the engineers the main issues have been the development of appropriate models and the evaluation of intrinsic kinetics parameters that allow the scale up or re-design of efficient large-scale photocatalytic reactors. In order to obtain intrinsic kinetics parameters the reaction must be analysed and modelled considering the influence of the radiation field, pollutant concentrations and fluid dynamics. In this way, the obtained kinetic parameters are independent of the reactor size and configuration and can be subsequently used for scale-up purposes or for the development of entirely new reactor designs. This work investigates the intrinsic kinetics of phenol degradation over titania film due to the practicality of a fixed film configuration over a slurry. A flat plate reactor was designed in order to be able to control reaction parameters that include the UV irradiance, flow rates, pollutant concentration and temperature. Particular attention was paid to the investigation of the radiation field over the reactive surface and to the issue of mass transfer limited reactions. The ability of different emission models to describe the radiation field was investigated and compared to actinometric measurements. The RAD-LSI model was found to give the best predictions over the conditions tested. Mass transfer issues often limit fixed film reactors. The influence of this phenomenon was investigated with specifically planned sets of benzoic acid experiments and with the adoption of the stagnant film model. The phenol mass transfer coefficient in the system was calculated to be km,phenol=8.5815x10-7Re0.65(ms-1). The data obtained from a wide range of experimental conditions, together with an appropriate model of the system, has enabled determination of intrinsic kinetic parameters. The experiments were performed in four different irradiation levels (70.7, 57.9, 37.1 and 20.4 W m-2) and combined with three different initial phenol concentrations (20, 40 and 80 ppm) to give a wide range of final pollutant conversions (from 22% to 85%). The simple model adopted was able to fit the wide range of conditions with only four kinetic parameters; two reaction rate constants (one for phenol and one for the family of intermediates) and their corresponding adsorption constants. The intrinsic kinetic parameters values were defined as kph = 0.5226 mmol m-1 s-1 W-1, kI = 0.120 mmol m-1 s-1 W-1, Kph = 8.5 x 10-4 m3 mmol-1 and KI = 2.2 x 10-3 m3 mmol-1. The flat plate reactor allowed the investigation of the reaction under two different light configurations; liquid and substrate side illumination. The latter of particular interest for real world applications where light absorption due to turbidity and pollutants contained in the water stream to be treated could represent a significant issue. The two light configurations allowed the investigation of the effects of film thickness and the determination of the catalyst optimal thickness. The experimental investigation confirmed the predictions of a porous medium model developed to investigate the influence of diffusion, advection and photocatalytic phenomena inside the porous titania film, with the optimal thickness value individuated at 5 ìm. The model used the intrinsic kinetic parameters obtained from the flat plate reactor to predict the influence of thickness and transport phenomena on the final observed phenol conversion without using any correction factor; the excellent match between predictions and experimental results provided further proof of the quality of the parameters obtained with the proposed method.
6

FORMOZOV, ANDREY. "SEARCH FOR NON-STANDARD NEUTRINO INTERACTIONS WITH LARGE-VOLUME LIQUID SCINTILLATOR DETECTORS." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/646205.

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Even though electroweak part of the Standard Model passed decades of testing and precision measurements, there is still a space for the presence of new physics. In particular, the neutrino sector in the last years has been reaching the level of precision oscillometry. However, the current data are not able to exclude many possible extended scenarios, in which new interactions comparable with the standard ones are still possible. This work is dedicated to beyond-Standard-Model interactions of neutrino and electron called Non-Standard Interactions or shortly NSI. Analogously to standard electroweak interactions, NSI could be charged current (CC) and neutral current (NC) type. Usually, in analyses of experiments, NC and CC NSI are considered separately, and I follow this strategy in the course of this work. The global search for NSI involves almost all experimental approaches of neutrino physics and goes far beyond the scope of this work. Here, instead, I look at the problem through the prism of the large-scale liquid scintillator experiments and confine the investigation to the search for NC NSI with solar neutrinos. In addition, I review CC NSI with reactor neutrinos at medium baseline. As a contribution into upcoming JUNO experiment, I investigate liquid scintillator energy response and radiopurity, which are essential for the successful realization of solar and reactor neutrino physics programs and, therefore, for NC and CC NSI search. I analyze in detail the non-linearity and energy resolution of liquid scintillator. I develop an experimental Compton coincidence technique with High Pure Germanium gamma spectrometer, provide a conservative measurement of the Birks’ ionization quenching constant kB and discuss problems related to its measurement. Throughout the study, I also formulate the optimal characteristics of the experimental apparatus for this improvement. The ultimate goal of this investigation is separating intrinsic energy resolution, which was never yet robustly measured for liquid organic scintillators. The intrinsic energy resolution may have an impact on the energy response of the new generation large liquid scintillator detectors such as JUNO and have to be carefully investigated. Applying single photon counting technique, I perform a calibration of the PMT charge scale and set apart statistical term from the total liquid scintillator energy resolution. Remaining term significantly differs from zero, indicating the presence of additional contribution associated with the intrinsic energy resolution. As an outlook, the precise estimation of the light collection should be conducted in order to ensure that its contribution is not significant to mimic the observed intrinsic resolution effect. The analysis of the radiopurity of the liquid scintillator showed that it is close to the one demanded for reactor neutrino program and CC-NSI search. Still, an improvement of purification procedure is necessary to fulfill solar neutrino program requirements for NC NSI search. Finally, I place the limits to NC NSI parameters for electron and tau neutrino with the Phase II data of Borexino experiment. The limits are quite stringent and compatible with other experiments. The best up-to-date limit to the left electron NSI-parameter is obtained. The allowed regions could be further significantly reduced by incorporating the current result in a global analysis. Besides, the same analysis approach is used to measure the squared sine of the Weinberg angle with a precision comparable with reactor neutrino experiments and place the most robust limit on the probability of ν−ν̄ conversion in the Sun for solar neutrinos with energies Eν < 1.8 MeV. I conclude with deliberation on the applicability of solar neutrino NC NSI approach for current JUNO detector configuration.
7

Paul, Uchenna Prince. "Fluorescence Detectors for Proteins and Toxic Heavy Metals." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd416.pdf.

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8

Wissel, Daniel [Verfasser]. "Intrinsic Dimension Estimation using Simplex Volumes / Daniel Wissel." Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1153467011/34.

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9

Cotsakis, Ryan. "Sur la géométrie des ensembles d'excursion : garanties théoriques et computationnelles." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5007.

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L'ensemble d'excursion EX(u) d'un champ aléatoire réel X sur R^d à un niveau de seuil u ∈ R est le sous-ensemble du domaine R^d où X dépasse u. Ainsi, l'ensemble d'excursion est aléatoire, et sa distribution à un niveau fixe u est déterminée par la distribution de X. Étant des sous-ensembles de R^d, les ensembles d'excursions peuvent être étudiés en termes de leurs propriétés géométriques comme moyen d'obtenir des informations partielles sur les propriétés de distribution des champs aléatoires sous-jacents.Cette thèse examine :(a) comment les mesures géométriques d'un ensemble d'excursion peuvent être déduites à partir d'un échantillon discret de l'ensemble d'excursion, et(b) comment ces mesures peuvent être liées aux propriétés distributionnelles du champ aléatoire à partir duquel l'ensemble d'excursion a été obtenu. Chacun de ces points est examiné en détail dans le Chapitre 1, qui fournit un aperçu global des résultats trouvés tout au long du reste de ce manuscrit. Les mesures géométriques que nous étudions (pour les ensembles d'excursion et les sous-ensembles déterministes de R^d) lors de l'adressage du point (a) sont la mesure de la surface de dimension (d−1), le reach, et le rayon de r-convexité. Chacune de ces quantités peut être liée à la régularité de la frontière de l'ensemble, ce qui est souvent difficile à déduire à partir d'échantillons discrets de points.Pour résoudre ce problème, nous apportons les contributions suivantes au domaine de la géométrie computationnelle :- Dans le Chapitre 2, nous identifions le facteur de biais qui correspond aux algorithmes de comptage local pour calculer la mesure de la surface de dimension (d − 1) des ensembles d'excursion sur une grande classe de pavages de R^d. Le facteur de biais dépend uniquement de la dimension d et non de la géométrie précise du pavage.- Dans le Chapitre 3, nous introduisons un algorithme de comptage pseudo-local pour calculer le périmètre des ensembles d'excursion en deux dimensions. L'algorithme proposé est convergent multigrille (multigrid convergent en anglais) et comporte un hyper paramètre réglable pouvant être choisi automatiquement à partir d'informations accessibles.- Dans le Chapitre 4, nous introduisons le β-reach en tant que généralisation du reach, et l'utilisons pour prouver la cohérence d'un estimateur du reach des sous-ensembles fermés de R^d. De même, nous définissons un estimateur cohérent du rayon de r-convexité des sous-ensembles fermés de R^d. De nouvelles relations théoriques sont établies entre le reach et le rayon de r-convexité. Nous étudions également comment ces mesures géométriques des ensembles d'excursion sont liées à la distribution du champ aléatoire.- Dans le Chapitre 5, nous introduisons l'extremal range : une statistique géométrique locale qui caractérise l'étendue spatiale des dépassements de seuil à un niveau fixe u ∈ R. La distribution de l'extremal range est entièrement déterminée par la distribution de l'ensemble d'excursion au niveau u. Nous montrons comment l'extremal range est liée distributionnellement aux volumes intrinsèques de l'ensemble d'excursion. De plus, le comportement limite de l'extremal range aux grands seuils est étudié en relation avec la stabilité des peaks-over-threshold du champ aléatoire sous-jacent. Enfin, la théorie est appliquée à des données climatiques réelles pour mesurer le degré d'indépendance asymptotique présent et sa variation dans l'espace.Des perspectives sur la manière dont ces résultats peuvent être améliorés et étendus sont fournies dans le Chapitre 6
The excursion set EX(u) of a real-valued random field X on R^d at a threshold level u ∈ R is the subset of the domain R^d on which X exceeds u. Thus, the excursion set is random, and its distribution at a fixed level u is determined by the distribution of X. Being subsets of R^d, excursion sets can be studied in terms of their geometrical properties as a means of obtaining partial information about the distributional properties of the underlying random fields.This thesis investigates(a) how the geometric measures of an excursion set can be inferred from a discrete sample of the excursion set, and(b) how these measures can be related back to the distributional properties of the random field from which the excursion set was obtained.Each of these points are examined in detail in Chapter 1, which provides a broad overview of the results found throughout the remainder of this manuscript. The geometric measures that we study (for both excursion sets and deterministic subsets of R^d) when addressing point (a) are the (d − 1)-dimensional surface area measure, the reach, and the radius of r-convexity. Each of these quantities can be related to the smoothness of the boundary of the set, which is often difficult to infer from discrete samples of points. To address this problem, we make the following contributions to the field of computational geometry:• In Chapter 2, we identify the bias factor in using local counting algorithms for computing the (d − 1)-dimensional surface area of excursion sets over a large class of tessellations of R^d. The bias factor is seen to depend only on the dimension d and not on the precise geometry of the tessellation.• In Chapter 3, we introduce a pseudo-local counting algorithm for computing the perimeter of excursion sets in two-dimensions. The proposed algorithm is multigrid convergent, and features a tunable hyperparameter that can be chosen automatically from accessible information.• In Chapter 4, we introduce the β-reach as a generalization of the reach, and use it to prove the consistency of an estimator for the reach of closed subsets of R^d. Similarly, we define a consistent estimator for the radius of r-convexity of closed subsets of R^d. New theoretical relationships are established between the reach and the radius of r-convexity.We also study how these geometric measures of excursion sets relate to the distribution of the random field.• In Chapter 5, we introduce the extremal range: a local, geometric statistic that characterizes the spatial extent of threshold exceedances at a fixed level threshold u ∈ R. The distribution of the extremal range is completely determined by the distribution of the excursion set at the level u. We show how the extremal range is distributionally related to the intrinsic volumes of the excursion set. Moreover, the limiting behavior of the extremal range at large thresholds is studied in relation to the peaks-over-threshold stability of the underlying random field. Finally, the theory is applied to real climate data to measure the degree of asymptotic independence present, and its variation throughout space.Perspectives on how these results may be improved and expanded upon are provided in Chapter 6
10

Savas, Berkant. "Algorithms in data mining using matrix and tensor methods." Doctoral thesis, Linköpings universitet, Beräkningsvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11597.

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In many fields of science, engineering, and economics large amounts of data are stored and there is a need to analyze these data in order to extract information for various purposes. Data mining is a general concept involving different tools for performing this kind of analysis. The development of mathematical models and efficient algorithms is of key importance. In this thesis we discuss algorithms for the reduced rank regression problem and algorithms for the computation of the best multilinear rank approximation of tensors. The first two papers deal with the reduced rank regression problem, which is encountered in the field of state-space subspace system identification. More specifically the problem is \[ \min_{\rank(X) = k} \det (B - X A)(B - X A)\tp, \] where $A$ and $B$ are given matrices and we want to find $X$ under a certain rank condition that minimizes the determinant. This problem is not properly stated since it involves implicit assumptions on $A$ and $B$ so that $(B - X A)(B - X A)\tp$ is never singular. This deficiency of the determinant criterion is fixed by generalizing the minimization criterion to rank reduction and volume minimization of the objective matrix. The volume of a matrix is defined as the product of its nonzero singular values. We give an algorithm that solves the generalized problem and identify properties of the input and output signals causing a singular objective matrix. Classification problems occur in many applications. The task is to determine the label or class of an unknown object. The third paper concerns with classification of handwritten digits in the context of tensors or multidimensional data arrays. Tensor and multilinear algebra is an area that attracts more and more attention because of the multidimensional structure of the collected data in various applications. Two classification algorithms are given based on the higher order singular value decomposition (HOSVD). The main algorithm makes a data reduction using HOSVD of 98--99 \% prior the construction of the class models. The models are computed as a set of orthonormal bases spanning the dominant subspaces for the different classes. An unknown digit is expressed as a linear combination of the basis vectors. The resulting algorithm achieves 5\% in classification error with fairly low amount of computations. The remaining two papers discuss computational methods for the best multilinear rank approximation problem \[ \min_{\cB} \| \cA - \cB\| \] where $\cA$ is a given tensor and we seek the best low multilinear rank approximation tensor $\cB$. This is a generalization of the best low rank matrix approximation problem. It is well known that for matrices the solution is given by truncating the singular values in the singular value decomposition (SVD) of the matrix. But for tensors in general the truncated HOSVD does not give an optimal approximation. For example, a third order tensor $\cB \in \RR^{I \x J \x K}$ with rank$(\cB) = (r_1,r_2,r_3)$ can be written as the product \[ \cB = \tml{X,Y,Z}{\cC}, \qquad b_{ijk}=\sum_{\lambda,\mu,\nu} x_{i\lambda} y_{j\mu} z_{k\nu} c_{\lambda\mu\nu}, \] where $\cC \in \RR^{r_1 \x r_2 \x r_3}$ and $X \in \RR^{I \times r_1}$, $Y \in \RR^{J \times r_2}$, and $Z \in \RR^{K \times r_3}$ are matrices of full column rank. Since it is no restriction to assume that $X$, $Y$, and $Z$ have orthonormal columns and due to these constraints, the approximation problem can be considered as a nonlinear optimization problem defined on a product of Grassmann manifolds. We introduce novel techniques for multilinear algebraic manipulations enabling means for theoretical analysis and algorithmic implementation. These techniques are used to solve the approximation problem using Newton and Quasi-Newton methods specifically adapted to operate on products of Grassmann manifolds. The presented algorithms are suited for small, large and sparse problems and, when applied on difficult problems, they clearly outperform alternating least squares methods, which are standard in the field.
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Книги з теми "Intrinsic volume":

1

Wu, Jianping, and Joseph William Holloway. Red Meat Science and Production: Volume 2. Intrinsic Meat Character. Springer, 2019.

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2

Wu, Jianping, and Joseph William Holloway. Red Meat Science and Production: Volume 2. Intrinsic Meat Character. Springer Singapore Pte. Limited, 2020.

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3

(Editor), S. S. Kutateladze, and Yu G. Reshetnyak (Editor), eds. A.D. Alexandrov: Selected Works: Intrinsic Geometry of Convex Surfaces - 2 Volume Set (Classics of Soviet Mathematics). CRC, 2005.

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4

Oliver, Charles M., and S. Ramani Moonesinghe. Setting rate, volume, and time in ventilatory support. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0093.

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Ventilator rate, volume, and time parameters are interrelated directly, mechanically, and physiologically, and interactions between intrinsic pulmonary physio-mechanics, pathology and the effects of mechanical ventilation complex. The physiological consequences of mechanical ventilation and risks of ventilator-induced trauma may be exacerbated by lung pathology. Programming of ventilator parameters should be considered within the context of an individualized ventilatory strategy to achieve adequate gas exchange, while minimizing attendant risks of mechanical ventilation. Recommended strategies should be modified within accepted limits to mitigate disease-specific risks. Parameters should subsequently be titrated against blood gas- and ventilator-derived targets, and other clinical variables.
5

Bloom, Floyd E. Handbook of Physiology: Section 1: The Nervous System Volume IV: Intrinsic Regulatory Systems of the Brain (HANDBOOK OF PHYSIOLOGY: SECT 1: NERVOUS SYSTEM). An American Physiological Society Book, 1985.

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6

Konrad, Kerstin, Adriana Di Martino, and Yuta Aoki. Brain volumes and intrinsic brain connectivity in ADHD. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198739258.003.0006.

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Neuroimaging studies have increased our understanding of the neurobiological underpinnings of ADHD. Structural brain imaging studies demonstrate widespread changes in brain volumes, in particular in frontal-striatal-cerebellar networks. Based on the widespread nature of structural and functional brain abnormalities, approaches able to capture the organizing principles of large-scale neural systems have been used in ADHD. These include diffusion magnetic resonance imaging (MRI) and resting state functional MRI (R-fMRI). Complementary to findings of volumetric studies, diffusion investigations have reported structural connectivity abnormalities in frontal-striatal-cerebellar networks. In parallel, R-fMRI studies point towards abnormalities in the interaction of multiple networks, extending the functional territory of explorations beyond cognitive and motor control. In the future, a deep phenotypic characterization beyond diagnostic categories combined with longitudinal study designs and novel analytical approaches will accelerate the pace towards clinical translations of neuroimaging to improve the detection and prediction of neural trajectories and treatment response in ADHD.
7

Vincent, Jean-Louis. Ethical issues in cardiac arrest and acute cardiac care: a European perspective. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199687039.003.0013.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system enables adaptation of not only respiratory management, but also haemodynamic management.
8

Vincent, Jean-Louis. Ethical issues in cardiac arrest and acute cardiac care: a European perspective. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199687039.003.0013_update_001.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system enables adaptation of not only respiratory management, but also haemodynamic management.
9

Vieillard-Baron, Antoine. The respiratory system. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199687039.003.0015.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system enables adaptation of not only respiratory management, but also haemodynamic management.
10

Lameire, Norbert, Raymond Vanholder, and Wim Van Biesen. Clinical approach to the patient with acute kidney injury. Edited by Norbert Lameire. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199592548.003.0222_update_001.

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The prognosis of acute kidney injury (AKI) depends on early diagnosis and therapy. A multitude of causes are classified according to their origin as prerenal, intrinsic (intrarenal), and post-renal.Prerenal AKI means a loss of renal function despite intact nephrons, for example, because of volume depletion and/or hypotension.There is a broad spectrum of intrinsic causes of AKI including acute tubular necrosis (ATN), interstitial nephritis, glomerulonephritis, and vasculitis. Evaluation includes careful review of the patient’s history, physical examination, urinalysis, selected urine chemistries, imaging of the urinary tree, and eventual kidney biopsy. The history should focus on the tempo of loss of function (if known), associated systemic diseases, and symptoms related to the urinary tract (especially those that suggest obstruction). In addition, a review of the medications looking for potentially nephrotoxic drugs is essential. The physical examination is directed towards the identification of findings of a systemic disease and a detailed assessment of the patient’s haemodynamic status. This latter goal may require invasive monitoring, especially in the oliguric patient with conflicting clinical findings, where the physical examination has limited accuracy.Excluding urinary tract obstruction is necessary in all cases and may be established easily by renal ultrasound.Distinction between the two most common causes of AKI (prerenal AKI and ATN) is sometimes difficult, especially because the clinical examination is often misleading in the setting of mild volume depletion or overload. Urinary chemistries, like calculation of the fractional excretion of sodium (FENa), may be used to help in this distinction. In contrast to FENa, the fractional excretion of urea has the advantage of being rather independent of diuretic therapy. Response to fluid repletion is still regarded as the gold standard in the differentiation between prerenal and intrinsic AKI. Return of renal function to baseline or resuming of diuresis within 24 to 72 hours is considered to indicate ‘transient, mostly prerenal AKI’, whereas persistent renal failure usually indicates intrinsic disease. Transient AKI may, however, also occur in short-lived ATN. Furthermore, rapid fluid application is contraindicated in a substantial number of patients, such as those with congestive heart failure.‘Muddy brown’ casts and/or tubular epithelial cell casts in the urine sediment are typically seen in patients with ATN. Their presence is an important tool in the distinction between ATN and prerenal AKI, which is characterized by a normal sediment, or by occasional hyaline casts. There is a possible role for new serum and/or urinary biomarkers in the diagnosis and prognosis of the patient with AKI, including the differential diagnosis between pre-renal AKI and ATN. Further studies are needed before their routine determination can be recommended.When a diagnosis cannot be made with reasonable certainty through this evaluation, renal biopsy should be considered; when intrarenal causes such as crescentic glomerulonephritis or vasculitis are suspected, immediate biopsy to avoid delay in the initiation of therapy is mandatory.
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Частини книг з теми "Intrinsic volume":

1

Kass, David A. "Extrinsic Versus Intrinsic Determinants of the Diastolic Pressure—Volume Relation." In Cardiac-Vascular Remodeling and Functional Interaction, 143–62. Tokyo: Springer Japan, 1997. http://dx.doi.org/10.1007/978-4-431-67041-4_12.

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2

Cronenberg, Stephanie. "Considering Young Adolescent Intrinsic Motivation in Music Learning." In Dialogues in Middle Level Education Research Volume 2, 187–96. New York: Routledge, 2023. http://dx.doi.org/10.4324/b23258-20.

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3

Beer, Randall D. "Environmental Influences and Intrinsic Dynamics in Adaptive Behavior." In Prerational Intelligence: Adaptive Behavior and Intelligent Systems Without Symbols and Logic, Volume 1, Volume 2 Prerational Intelligence: Interdisciplinary Perspectives on the Behavior of Natural and Artificial Systems, Volume 3, 718–23. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-0870-9_45.

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4

Cheng, Hwee Ming, Kin Kheong Mah, and Kumar Seluakumaran. "Defecation Reflex: Parasympathetic Defecation Reflex, Intrinsic Myenteric Defection Reflex." In Defining Physiology: Principles, Themes, Concepts. Volume 2, 75–77. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62285-5_21.

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5

Pratt, Jon R., Gordon A. Shaw, and Douglas T. Smith. "Nanomechanical standards based on the intrinsic mechanics of molecules and atoms." In MEMS and Nanotechnology, Volume 2, 1–7. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8825-6_1.

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6

Bredlau, Amy Lee, and David N. Korones. "Diffuse Intrinsic Pontine Gliomas in Children: Treatment (An Update)." In Tumors of the Central Nervous System, Volume 11, 75–83. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7037-9_6.

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7

Ghazi, Reza Mohammadi, and Oral Buyukozturk. "Assessment and Localization of Active Discontinuities Using Energy Distribution Between Intrinsic Modes." In Structural Health Monitoring, Volume 5, 1–9. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04570-2_1.

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8

Beeler, Benjamin, Chaitanya Deo, Michael Baskes, and Maria Okuniewski. "Atomistic Investigations of Intrinsic and Extrinsic Point Defects in bcc Uranium." In Effects of Radiation on Nuclear Materials: 25th Volume, 231–47. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104141.

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9

Kodaira, K. "38. On Kahler Varieties of Restricted Type (An Intrinsic Characterization of Algebraic Varieties)." In Kunihiko Kodaira: Collected Works, Volume II, 687–707. Princeton: Princeton University Press, 2015. http://dx.doi.org/10.1515/9781400869862-008.

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10

Ionescu, Clara M., and J. Tenreiro Machado. "Intrinsic Fractal Dynamics in the Respiratory System by Means of Pressure–Volume Loops." In Nonlinear and Complex Dynamics, 217–27. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0231-2_18.

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Тези доповідей конференцій з теми "Intrinsic volume":

1

Sood, P. C. "Intrinsic excitations in doubly odd nuclei." In AIP Conference Proceedings Volume 125. AIP, 1985. http://dx.doi.org/10.1063/1.35038.

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2

Danos, Michael, L. C. Biedenharn, and Alfons Stahlhofen. "Comprehensive theory of nuclear effects on the intrinsic sticking probability: II++." In AIP Conference Proceedings Volume 181. AIP, 1988. http://dx.doi.org/10.1063/1.37918.

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3

Danos, Micheal, L. C. Biedenharn, and Alfons Stahlhofen. "Comprehensive theory of nuclear effects on the intrinsic sticking probability: I." In AIP Conference Proceedings Volume 181. AIP, 1988. http://dx.doi.org/10.1063/1.37917.

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4

Nagaoka, Ryo, Kazuto Kobayashi, Shin Yoshizawa, Shin-ichiro Umemura, and Yoshifumi Saijo. "Intrinsic elastography and its dependence on arterial flow volume." In 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2015. http://dx.doi.org/10.1109/embc.2015.7319835.

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5

Yaghoobzadeh, Yadollah, and Hinrich Schütze. "Intrinsic Subspace Evaluation of Word Embedding Representations." In Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers). Stroudsburg, PA, USA: Association for Computational Linguistics, 2016. http://dx.doi.org/10.18653/v1/p16-1023.

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6

Chia-Ping Chen and Chu-Song Chen. "Lighting normalization with generic intrinsic illumination subspace for face recognition." In Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1. IEEE, 2005. http://dx.doi.org/10.1109/iccv.2005.144.

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7

Wang, J., Q. S. Sun, H. N. Liu та Y. L. He. "Photo-induced density-of-states variation measured by DLTS method in intrinsic micro-crystalline silicon (i-μc-Si:H) films". У AIP Conference Proceedings Volume 157. AIP, 1987. http://dx.doi.org/10.1063/1.36526.

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8

Haifeng Gong, Chunhong Pan, Qing Yang, Hanqing Lu, and Songde Ma. "A semi-supervised framework for mapping data to the intrinsic manifold." In Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1. IEEE, 2005. http://dx.doi.org/10.1109/iccv.2005.18.

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9

Klym, H., and Kostiv Yu. "Intrinsic free volume in thick-film layers based on semiconductor Cu0.1Ni0.1Co1.6Mn1.2O4 ceramics." In 2016 IEEE 7th International Conference on Advanced Optoelectronics and Lasers (CAOL). IEEE, 2016. http://dx.doi.org/10.1109/caol.2016.7851446.

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10

Hench, Larry L. "Intrinsic silica optical components by solgel processing." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.fe3.

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The unique intrinsic optical properties of new alkoxide solgels derived (type V and VI) gel silica optics are compared with types I and II fused quartz optics and types III and IV synthetic fused silica optics. Type V gel silica has excellent transmission in the vacuum ultraviolet with the cutoff near theoretical, based on quantum mechanical calculations, at 159 nm. The high optical transmission extends up to 4200 nm with no OH absorption peaks in the near infrared. Other physical properties and structural characteristics of type V gel silica are similar to the highest grade fused silica but offer the important advantages of netshape casting with high accuracy. This eliminates the labor intensive grinding and polishing of many precision optical components. In addition, optical elements such as Fresnel lenses or elements with internal cavities can be made with the solgel type V silica process. Type V gel silica also has a lower coefficient of thermal expansion than traditional commercial vitreous silica optics and the lower expansion extends over a broader temperature range. It is also possible to make optically transparent gel silica with a controlled volume fraction inside of pores. This new material for optical use is called type VI gel silica. The ultraporous type VI gel silica optics can be impregnated with up to 30-40% by volume from a second phase that can be optically active organic or inorganic compounds. The type VI porous gel silica can also be used as a substrate for laser densification of waveguides.

Звіти організацій з теми "Intrinsic volume":

1

PARSONS ENGINEERING SCIENCE INC DENVER CO. Treatability Study in Support of Intrinsic Remediation for Site OT 24. Volume 1. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada381498.

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2

PARSONS ENGINEERING SCIENCE INC DENVER CO. Treatability Study in Support of Intrinsic Remediation for Site OT 24 at MacDill Air Force Base, Florida. Volume 2. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada286946.

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3

PARSONS ENGINEERING SCIENCE INC DENVER CO. Treatability Study in Support of Intrinsic Remediation for Site OT 24 at MacDill Air Force Base, Florida. Volume 1. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada286947.

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Wiedemeier, Todd H., John T. Wilson, Donald H. Kampbell, Ross N. Miller, and Jerry E. Hansen. Technical Protocol for Implementing Intrinsic Remediation with Long-Term Monitoring for Natural Attenuation of Fuel Contamination Dissolved in Groundwater. Volume II. Fort Belvoir, VA: Defense Technical Information Center, June 1995. http://dx.doi.org/10.21236/ada324247.

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Wiedemeier, Todd H., John T. Wilson, Donald H. Kampbell, Ross N. Miller, and Jerry E. Hansen. Technical Protocol for Implementing Intrinsic Remediation with Long-Term Monitoring for Natural Attenuation of Fuel Contamination Dissolved in Groundwater. Volume I. Fort Belvoir, VA: Defense Technical Information Center, June 1995. http://dx.doi.org/10.21236/ada324248.

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PARSONS ENGINEERING SCIENCE INC DENVER CO. Remedial Action Option Evaluation in Support of Intrinsic Remediation for the Jet Fuel Transfer Line Southwest of Building 412 and the POL Yard. Volume 1: Text. Fort Belvoir, VA: Defense Technical Information Center, February 1995. http://dx.doi.org/10.21236/ada381496.

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PARSONS ENGINEERING SCIENCE INC DENVER CO. Treatability Study in Support of Intrinsic Remediation for the Jet Fuel Transfer Line Southwest of Building 412 and the POL Yard. Volume 2: Appendices. Wisconsin Air National Guard at Truax Field, Madison, Wisconsin. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada286964.

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