Relevant bibliographies by topics / IRTF

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'IRTF'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 May 2024

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Journal articles on the topic "IRTF"

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Ohikhena, Agele, Samuel. "Dry season Irrigation Regime Effects on Water Use, Rootzone Moisture and Yield of Cacao (Theobroma cacao L.) in a Rainforest Zone of Nigeria." International Journal of Plant & Soil Science 35, no. 18 (July 17, 2023): 302–20. http://dx.doi.org/10.9734/ijpss/2023/v35i183293.

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The humid tropics is characterized by wet-dry seasonal transitions, irrigation has the potential for building adaptation and resilience to climate stress for enhancing crop performance. A field trial was conducted to investigate the effects of dry season irrigation regimes on water use, root zone moisture dynamics and yield of cacao in a rainforest zone of Nigeria. Irrigation amounts computed as EPan x Pan coefficients were based on cumulative class A Pan evaporation. Irrigation treatments were coded as IrT1 (EPan x 1,0), IrT2 (EPan x 0.7) and IrT3 (EPan x 0.5). Irrigation water was applied 5-days interval and discharged via point source emitters (2.8 l/h discharge rate ) on drip lines laterally installed per row of trees. Mean irrigation requirements were 4.49 mm (9.81:9.6 l/tree/day), 3.14 mm (7.06:6.8 l/tree/day) and 2.44 mm (5.49: 4.8 l/tree/day) while total seasonal water applied were 121.19, 84.83 and 60.59 l/tree for IrT1, IrT2 and IrT3 respectively. Mean soil moisture contents and cacao evapotranspiration (ETc) were 52, 45 and 28 % and 4.54, 3.19 and 2.32 mm/day while evaporation from soil area wetted by emitters (EWz) were 5.65, 2.82 and 0.19 mm/day for respective IrT1, IrT2 and IrT3. The deficit irrigation strategies (IrT2 and 31 IrT3) imposed soil moisture deficit stress on cacao and produced lower pod and bean yields, it however enhanced water use efficiencies (25 and 44 %) and 30 and 50 % water savings. The study established suitable Pan coefficients for scheduling irrigation for cacao yield enhancement and drought (climate stress) amelioration.
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Kroustallas, Fotios G., Georgios A. Papadopoulos, Sofia Chalvatzi, Vasilis Skampardonis, Leonidas Leontides, and Paschalis Fortomaris. "Infrared Thermography Evaluation of Feet Temperature and Its Association with Claw Lengths and Anisodactylia in Purebred Sows of Three Greek Herds." Veterinary Sciences 8, no. 12 (December 6, 2021): 309. http://dx.doi.org/10.3390/vetsci8120309.

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The aim of the study was to investigate the associations of lower feet temperature with claw lengths measurements in purebred sows. In total 22, 19 and 45 multiparous sows in three herds A, B and C of PIC, DANBRED and TOPIGS genetic lines respectively participated in the study. Mean parity was 2.5, 2.3 and 3.0 for sows from herds A, B and C respectively. Measurements were made during the periparturient period. Infrared temperature distribution was measured in carpus/tarsus, upper-lower metacarpi/metatarsi and phalanges (IRT1, IRT2, IRT3 and IRT4 respectively). In addition, dorsal, diagonal, heel–sole and dew claw lengths of medial and lateral claw were measured and the difference in dorsal claw length between medial and lateral claw (anisodactylia) was calculated in all four feet. Differences between herds regarding IRT and claw length measurements were analyzed with one-way ANOVA with herds as a fixed factor. Correlations between IRT and claw length measurements in each foot including data from all herds were evaluated using the Pearson’s correlation test. Maximum IRT1 to 4 in almost all rear feet, differed significantly between herds, being lower in sows of herd C than A and B (p < 0.05). Claw lengths of all feet were lower in herd C than those of A and B (p < 0.05). Anisodactylia, differed significantly only in rear feet between herds been higher in herd A than C and B (p < 0.05). In all sows, claw lengths and rear feet anisodactylia were positively correlated with maximum IRT1 to IRT4 (p < 0.05). According to the results, IRT temperature distribution of lower feet of purebred sows of different genetic lines were positive correlated with claw lengths measurements and anisodactylia. Collectively, measuring IRT temperature of lower feet of sows with mobile IRT device could be used as an additional tool towards monitoring feet and claw health.
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Impey, C. D., C. G. Wynn-Williams, and E. E. Becklin. "Infrared Emission from Radio Galaxies." Symposium - International Astronomical Union 134 (1989): 404–5. http://dx.doi.org/10.1017/s0074180900141488.

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Kozlowski, Wojciech, and Rodney Van Meter. "Schrödinger's Internet at the IRTF." IEEE Communications Standards Magazine 4, no. 3 (September 2020): 4–6. http://dx.doi.org/10.1109/mcomstd.2020.9204590.

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Morales, Walter G., Alfredo Sequeira, Ester Chamorro, Mara Braga, Abilio Sobral, and Herminio De Sousa. "Termogravimetría y espectroscopía de infrarrojo para el control del rendimiento en la obtención de alquil esteres." Extensionismo, Innovación y Transferencia Tecnológica 2 (June 21, 2015): 35. http://dx.doi.org/10.30972/eitt.20278.

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En este trabajo se preparó zirconia modificada con sulfato de cerio al 5%, se evaluaron sus propiedades texturales y de acidez, y se han comparado bajo las mismas condiciones como catalizadores de las reacciones de esterificación y transesterificación de aceite de semilla de algodón con etanol y metanol. Las reacciones se llevaron a cabo en reactor bach bajo diferentes condiciones de tempe-ratura de reacción, relación molar aceite:alcohol, cantidad de catalizador y tiempo de reacción, la presión fue autogenerada de 30bar. Los productos de reacción fueron cuan-tificados por HPLC y posteriormente con análisis termogravimétrico (TGA) y espectroscopía infrarroja con transformada de Fourier (IRTF). Se halló que el análisis TGA es muy útil para seguimiento de reacciones de obtención de etil y metil ésteres, hallándose diferencias importantes hasta concentración del 96%, mientras que el IRTF es mucho menos sensible
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Marcq, E., I. Amine, M. Duquesnoy, and B. Bézard. "Evidence for SO2 latitudinal variations below the clouds of Venus." Astronomy & Astrophysics 648 (April 2021): L8. http://dx.doi.org/10.1051/0004-6361/202140837.

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Context. Sulphur dioxide (SO2) is highly variable above the clouds of Venus, yet no spatial or temporal variability below the clouds had been known until now. Aims. In order to constrain Venus’s atmospheric circulation and chemistry (including possible volcanic outgassing), more accurate SO2 measurements below the clouds are therefore needed. Methods. We used the high-resolution iSHELL spectrometer located at the NASA IRTF to record thermal night-side spectra, which we fitted using an updated forward radiative transfer model that was previously employed to process SpeX/IRTF and VIRTIS-H/Venus Express spectra. Results. We report, for the first time, an increase in SO2 with increasing latitude (+30% between the minimum near 15°S and > 35°N). This is consistent with the interaction between the Hadley-cell circulation and a postulated vertical profile in SO2 estimated to increase between 30 and 40 km in altitude, as previously suggested by in situ ISAV measurements. Conclusions. This SO2 variability challenges our current understanding of Venus’s tropospheric thermochemistry and underlines the high scientific return from high-resolution spectroscopy from, for example, future orbiters.
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Rayner, John, Alan Tokunaga, Daniel Jaffe, Timothy Bond, Morgan Bonnet, Gregory Ching, Michael Connelley, et al. "iSHELL: a 1–5 micron R = 80,000 Immersion Grating Spectrograph for the NASA Infrared Telescope Facility." Publications of the Astronomical Society of the Pacific 134, no. 1031 (January 1, 2022): 015002. http://dx.doi.org/10.1088/1538-3873/ac3cb4.

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Abstract iSHELL is a 1.06–5.3 μm high spectral resolution spectrograph built for the 3.2 m NASA Infrared Telescope Facility (IRTF) on Maunakea, Hawaii. Dispersion is accomplished with a silicon immersion grating in order to keep the instrument small enough to be mounted at the Cassegrain focus of the telescope. The white pupil spectrograph produces resolving powers of up to about R ≡ λ/δλ = 80,000 (0.″375 slit). Cross-dispersing gratings mounted in a tiltable mechanism allow observers to select different wavelength ranges and, in combination with a slit wheel and Dekker mechanism, slit widths ranging from 0.″375 to 4.″0 and slit lengths ranging from 5″ to 25″. One Teledyne 2048 × 2048 HAWAII-2RG array is used in the spectrograph, and one Raytheon 512 × 512 Aladdin 2 array is used in a 1–5 μm slit viewer for object acquisition, guiding, and scientific imaging. iSHELL has been in productive regular use on IRTF since first light in 2016 September. In this paper we discuss details of the science case, design, construction and astronomical use of iSHELL.
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Cesetti, M., A. Pizzella, V. D. Ivanov, L. Morelli, E. M. Corsini, and E. Dalla Bontà. "The Infrared Telescope Facility (IRTF) spectral library:." Astronomy & Astrophysics 549 (January 2013): A129. http://dx.doi.org/10.1051/0004-6361/201219078.

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Morelli, L., V. D. Ivanov, A. Pizzella, D. Gasparri, L. Coccato, E. M. Corsini, E. Dalla Bontà, P. François, and M. Cesetti. "The Infrared Telescope Facility (IRTF) spectral library." Astronomy & Astrophysics 641 (September 2020): A44. http://dx.doi.org/10.1051/0004-6361/202037505.

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Context. Stellar population studies in the infrared (IR) wavelength range have two main advantages with respect to the optical regime: they probe different populations, because most of the light in the IR comes from redder and generally older stars, and they allow us to see through dust because IR light is less affected by extinction. Unfortunately, IR modeling work was halted by the lack of adequate stellar libraries, but this has changed in the recent years. Aims. Our project investigates the sensitivity of various spectral features in the 1−5 μm wavelength range to the physical properties of stars (Teff, [Fe/H], log g) and aims to objectively define spectral indices that can characterize the age and metallicity of unresolved stellar populations. Methods. We implemented a method that uses derivatives of the indices as functions of Teff, [Fe/H] or log g across the entire available wavelength range to reveal the most sensitive indices to these parameters and the ranges in which these indices work. Results. Here, we complement the previous work in the I and K bands, reporting a new system of 14, 12, 22, and 12 indices for Y, J, H, and L atmospheric windows, respectively, and describe their behavior. We list the equivalent widths of these indices for the Infrared Telescope Facility (IRTF) spectral library stars. Conclusions. Our analysis indicates that features sensitive to the effective temperature are present and measurable in all the investigated atmospheric windows at the spectral resolution and in the metallicity range of the IRTF library for a signal-to-noise ratio greater than 20−30. The surface gravity is more challenging and only indices in the H and J windows are best suited for this. The metallicity range of the stars with available spectra is too narrow to search for suitable diagnostics. For the spectra of unresolved galaxies, the defined indices are valuable tools in tracing the properties of the stars in the IR-dominant stellar populations.
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Huitema, Christian, Geoff Huston, Dirk Kutscher, and Lixia Zhang. "Report of 2021 DINRG Workshop on Centralization in the Internet." ACM SIGCOMM Computer Communication Review 53, no. 2 (April 30, 2023): 31–39. http://dx.doi.org/10.1145/3610381.3610386.

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The Internet Research Task Force (IRTF) Research Group on Decentralizing the Internet (DINRG) hosted a workshop on Centralization in the Internet on June 3, 2021. The workshop focused on painting a broad-brush landscape of the Internet centralization problem space: its starting point, its driving force, together with an articulation on what can and should be done.
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Dissertations / Theses on the topic "IRTF"

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HELBERT, MARYVONNE. "Applications biomedicales de la spectromerie irtf." Nantes, 1990. http://www.theses.fr/1990NANT2002.

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Nous avons etudi trois applications de la spectrometrie irtf dans le domaine biomedical. Nous avons d'abord mis au point une methode d'analyse des calculs renaux par spectrometrie infrarouge utilisant la technique de la reflexion diffuse. Elle permet l'analyse quantitative et donc la creation d'une bibliotheque des spectres ir de tous les melanges en proportions quelconques des constitutants possibles des calculs renaux. Nous avons ainsi construit une bibliotheque de 497 spectres digitalises et etabli le protocole d'utilisation d'un logiciel d'analyse des calculs inconnus. Nous avons ensuite montre comment la modulation chimique d'un steroide, la triamcinolone, pouvait etre suivie par spectroscopie irtf dans la region des carbonyles. Une combinaison lineaire de spectres de molecules modeles permet de creer un spectre synthetique simulant le spectre experimental et de suivre les diffrentes etapes de transformation su steroide. Nous avons enfin tire avantage de la precision photometrique des spectrometres irtf pour mesurer avec plus de precision les constantes de formation de liaison hydrogene. Nous avons ainsi etabli une echelle de basicite utiisable dans les relations quantitatives structure-activite biologique et permettant de mieux comprendre la formation des complexes enzyme-substrat ou medicament-recepteur pour lesquels la liaison hydrogene constitue une des forces intermoleculaires les plus importantes.
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Chen, Hsiang-Hsin. "Imagerie IRTF tridimensionnelle pour l'étude de l'insuffisance rénale chronique." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0448/document.

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L’insuffisance rénale chronique (IRC) et l’une des pires maladies chroniques dans les pays développés. Les grades de l’IRC sont principalement basés sur la mesure ou l’estimation du taux de filtration rénale (GFR). Cependant, cette méthode est peu sensible sur les premiers stades de la pathologie et n’apporte donc pas de valeur diagnostique. La détection de la pathologie à des stades précoces et son traitement peuvent éviter ou limiter les effets délétères de la chronicité. Cette thèse se penche sur le développement de la microscopie IRTF en tant qu’outil diagnostic pour l’identification par histopathologie à l’échelle du glomérule dans un modèle d’IRC. Nous avons développé la technique de reconstruction 3D pour l’imagerie IRTF des modifications biochimiques à l’échelle du glomérule pour déterminer des marqueurs de l’IRC. La déconvolution spectrale et le clustering sont appliqués après analyses IRTF pour distinguer les modèles sains et pathologiques. Ensuite, la microvasculature glomérulaire est révélée par agent de contraste pour en déterminer les anomalies morphologiques. Grâce aux résultats obtenus en 3D et l’utilisation de méthodes statistiques avancées, la microscopie IRTF est utilisée comme une technique fonctionnelle pour déterminer les modifications morphologiques et moléculaires apparaissant au cours du développement de l’IRC
CKD (Chronic Kidney Disease) is one of the worst public diseases in developing countries. The stages of CKD are mainly based on measured or estimated GFR (Glomerular Filtration Rate). However, this method is not sensitive enough on early stages of the pathology and thus do not offer accurate diagnostic value. Early detection and treatment can often limit or avoid the chronicity effects of the disease. This thesis focuses on the development of FTIR microscopy as a diagnostic tool for the identification by histopathology at glomerulus level of the kidney in CKD model. We developed a technique of 3D reconstruction for the FTIR imaging of biochemical components changes in glomeruli for identifying the pathological marker of CKD. The curve-fitting and spectral clustering are applied on the FTIR microscopy analysis to distinguish between healthy and pathological glomeruli of a kidney. Then, the glomerular microvasculatureis highlighted to reveal the morphological abnormalities by perfusing contrast agents into blood vessels. With advanced 3D statistical methods and 3D image visualization by microscopy, FTIR spectro-imaging can be used as a functional technique to determine the morphological and molecular changes occurring along CKD development
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Belbachir, Karima. "Etude de l’organisation des collagènes dans les myopathies par spéctro-imagerie IRTF." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14215.

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Les myopathies sont une maladie rare qui entraine une déficience musculaire. Il apparait que la plupart des myopathies présentent une modification dans la biodistribution et la concentration des collagènes. Le diagnostic actuel de ces maladies repose sur l’étude de protéines déficientes par des outils de biologie moléculaire dont les résultats sont incertains. Nous proposons de développer la spectro-imagerie IRTF pour différencier les cinq principaux types de collagène dans le tissu conjonctif musculaire. Pour cela, nous avons appliqué deux méthodes : la déconvolution spectrale de l’amide I et la détermination des coefficients d’extinction anisotropes des fibres. Nous avons ensuite mis au point une matrice synthétique mimant la composition moléculaire d’un tissu musculaire squelettique d’un muscle de bœuf. Cette matrice a pour but de calibrer la spectro-imagerie IRTF et de quantifier à moyen terme les collagènes dans les tissus
Myopathies are a rare disease which leads a muscular deficiency. It seems that most of the myopathies present a modification in the biodistribution and in the concentration of collagens. The current diagnosis of these diseases is based on the study of deficient proteins by molecular biology techniques whose the results are uncertain. We suggest developing the spectro-imaging IRTF to differentiate five main types of collagen in the muscular connective tissue. For that, we applied two methods: the spectral déconvolution of the amide I and the determination of the anisotropic extinction coefficient of the fibers. Then, we have set up a synthetic matrix miming the molecular composition of a squeletic muscular tissue of beef muscle. This matrix aims at calibrating the spectro-imaging IRTTF and at quantifying in the medium term the collagen in tissues
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Shah, Kaya (Kaya Y. ). "Killer asteroids : feasibility of using the IRTF to track near-earth objects." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/114132.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2006.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 31).
The possibility of an asteroid or comet impact necessitates the tracking and cataloging of all such objects which could potentially impact Earth. Currently, no comprehensive catalog of Near Earth Objects (NEOs) exists which contains information on the physical properties of the objects. Spectroscopic observation of NEOs must be carried out in an efficient and timely manner in order to determine the physical properties of NEOs for this catalog. The cumulative fractions of objects visible at certain magnitudes were examined and compared for the NEOs discovered in 2005 at discovery, those at the first quarter moon following discovery, and all known NEOs in 1, 3, 5, and 10 year forecasted surveys to determine the best combination of Infrared Telescope Facility (IRTF) instrumentation, telescope observation time, and survey length. This thesis finds that the IRTF instrumentation should be improved to at least 19.5 to spectroscopically observe 57% of the objects discovered in 2005. Furthermore, spectroscopic observation of the objects should not occur at the first quarter moon immediately after discovery, as is currently the case, because as much as ~15% of the objects discovered in 2005 cannot be observed at this time. As survey length is increased, the fraction of objects that can be observed at the IRTF's current limiting magnitude also increase; thus it is best to conduct the survey as long as possible. Additionally, spectroscopic observation of the objects should be carried out every 7 days in order to gather the most information. Lastly, it is best to spectroscopically observe the objects within 7 days of discovery because the objects are generally discovered when they are at their closest possible approach to the Earth.
by Kaya Shah.
S.B.
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Dagneaux, Cécile. "Etude par spectroscopie IRTF de la structure de triple-hélices d'acides nucléiques." Paris 13, 1996. http://www.theses.fr/1996PA132008.

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On distingue trois grandes familles de triple-hélices classiques, obtenues en ciblant une séquence constituée principalement des bases puriques a et g en double-hélice. Ce sont les triple-hélices de type pyr*pur-pyr, dans lesquelles le troisième brin contient des thymines et (ou) des cytosines protonnées ; les triple-hélices de type pur*pur-pyr, dans lesquelles le troisième brin contient des guanines et (ou) des adénines et les triple-hélices mixtes, dans lesquelles le troisième brin contient des guanines et des thymines. Nous avons étudié notamment par spectroscopies ftir et UV la structure et les conditions de formation de triple-hélices classiques, formées en utilisant aussi bien des polynucléotides, que des oligonucléotides dont certains étaient modifiés (anomerie alpha ; 2'omethyl riboses, cytosines methylées). Il s'agissait notamment d'étudier la faisabilité de la triple-hélice de type pur*pur-pyr obtenue en ciblant la séquence polypurine des rétrovirus murins de friend et moloney. Nous avons ainsi montré que cibler cette séquence, conservée dans le génome des rétrovirus et composée de 13 bases, par un oligonucléotide composé des purines a et g, induit une inhibition de la prolifération du rétrovirus dans des cellules de dunni infectées de novo. Pour améliorer l'efficacité de l'utilisation des oligonucléotides formant des triple-hélices (tfo) sur les systèmes cellulaires infectés (stratégie antigènes), l'une des possibilités est d'élargir la reconnaissance par les bases de l'oligonucléotide troisième brin à des séquences contenant les quatre bases. La formation de complexes à trois brins ayant cette caractéristique est proposée en présence de protéines recombinantes. Dans ces complexes, le troisième brin constitue des quatre bases est de séquence homologue à celle d'un des brins de la double-hélice. Nous avons montré que de telles structures se forment en présence de la protéine reca d'e. Coli en solution.
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Masmoudi, Houda. "Vieillissement d'émulsions cosmétiques : apports comparés de la spectroscopie IRTF et de la rhéologie." Aix-Marseille 3, 2005. http://www.theses.fr/2005AIX30022.

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Les émulsions sont particulièrement présentes dans le domaine cosmétique. En fonction des nouvelles normes européennes, les industriels devront fournir davantage d'informations sur la composition, la toxicité et la durée d'utilisation des produits. Ils devront être capable d'estimer leur dégradation par des protocoles de vieillissement accéléré et des outils analytiques appropriés. Dans cette optique, les émulsions étudiées, ont été stockées à long terme à différentes températures pour accélérer leur vieillissement et évaluer leur stabilité. Leur évolution a été suivie par différentes techniques d'analyses : spectroscopie IRTF, rhéologie, microscopie, conductimétrie, texture. . . . La spectroscopie IRTF, par le biais d'indices structuraux, a révélé de nouvelles espèces issues de l'oxydation (identifiées par déconvolution) et des mécanismes d'oxydation ont été proposés. Les mesures rhéologiques, réalisées en parallèle, ont un aspect prédictif puisque des modifications des paramètres rhéologiques sont détectées pour des émulsions stables à l'œil nu et pour lesquelles aucune modification chimique n'est mesurée. De plus ces deux techniques ont permis de mettre en évidence l'influence de la nature de l'huile et de l'émulsifiant sur la stabilité des émulsions. Elles faciliteront ainsi le choix d'additifs
Emulsions play a major role in cosmetology. Given the new European standards, manufacturers will be compelled to provide more information on the products, in particular on their compositions, their toxicity and their expected lifetime. They will have to be able to assess the degradation through protocols of accelerated ageing and suitable analytical tools. Accordingly, the emulsions studied, were stored over a long-term duration at various temperatures to accelerate the ageing process and to evaluate the stability of cosmetic emulsions. Their evolution was followed by various classical analytical techniques: spectroscopy FTIR, rheology, microscopy, conductimetry, texture analysis. . . . Spectroscopy IRTF, using structural indices, revealed new species resulting from the oxidation (identified by deconvolution) and oxidation mechanisms are proposed. The rheological measurements, carried out at the same time, have a predictive aspect since modifications of the rheological parameters are detected for stable emulsions with the naked eye and for which no chemical modification is measured. Moreover these two techniques made it possible to highlight the influence of the nature of oil and of the emulsifier on the stability of the emulsions. Thus, they will ease the choice of additives
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Begaudeau, Karine. "Modélisation thermodynamique et Spectroscopies IRTF, RMN des pyroxènes : des xénolites à la rhéologie mantellique." Phd thesis, Université de La Rochelle, 2011. http://tel.archives-ouvertes.fr/tel-00696775.

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Ces dernières décennies, les xénolites de péridotites provenant des kimberlites et des basaltes ont contribué de manière déterminante à la compréhension de l'état physico-chimique du manteau supérieur de la Terre dont dépend la modélisation directe de déformation telle que le rebond post-glaciaire. Une telle approche requiert a priori la détermination des conditions physiques P, T et σ dont témoignent la chimie minérale et la texture de ces roches. Un protocole original d'inversion thermodynamique de données expérimentales pour des pyroxènes en équilibre mutuel, a d'abord été développé dans le but d'obtenir un géothermobaromètre fiable. D'autre part, l'étude menée par spectroscopie IRTF de pyroxènes montre que ces minéraux nominalement anhydres (NAMs) contiennent en fait de l'eau sous forme dissoute, de 38 à 450 ppm pour les cpx, et de 19 à 184 ppm pour les opx.Par son rôle perturbateur du réseau cristallin, cette eau affecte directement les propriétés physico-chimiques du manteau terrestre (viscosité, diagrammes de phase, conductivité électrique). La dissolution de cette eau est correlée à fO2, P et T, et seulement indirectement à la chimie des minéraux. Des analyses 1H, 27Al et 29Si MAS RMN sur ces phases contenant des teneurs non négligeables en fer, ainsi que sur des mélanges kaolinite+magnétite, permettent, entre autres, d'authentifier les signatures spectrales de ces pyroxènes naturels mais aussi de quantifier les espèces Al en termes de sites d'occupation. La complémentarité de ces outils, appliqués ici avec succès, ouvre de nouvelles perspectives de compréhension et modélisation des processus profonds.
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Essendoubi, Mohammed. "Identification et typage par (micro) spectroscopie IRTF des levures du genre Candida d'origine clinique." Reims, 2007. http://theses.univ-reims.fr/exl-doc/GED00000629.pdf.

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L'@apport de la (micro)spectroscopie infrarouge à transformée de Fourier (IRTF) à la différenciation et l’identification des levures du genre Candida isolés en milieu clinique a été évalué. Nous avons appliqué cette technique d’une part à l'identification de 96 souches appartenant à 6 espèces de Candida les plus fréquentes en clinique, d'autre part au typage de 3 espèces (albicans, glabrata et parapsilosis). Les résultats montrent que la différenciation des espèces est possible à partir des suspensions et des microcolonies. Une base de données comprenant 180 spectres de Candida appartenant à ces 6 espèces a été construite. A l'aide de souches inconnues, nous avons testé le potentiel de la méthode comme outil d'identification en routine. Pour 4 des espèces, un taux d’identification de 100% a pu être atteint. Le taux inférieur observé pour les deux autres espèces est expliqué par le manque de spectres représentatifs de ces espèces dans la base de données. Pour le typage, deux applications cliniques ont été menées : un suivi longitudinal de souches de C. Glabrata chez un patient hospitalisé en service de réanimation et un suivi épidémiologique sur 13 souches de C. Glabrata isolées chez 4 patients. Une transmission interhumaine des souches entre ces patients a pu être exclue aussi bien par spectroscopie IRTF que par RAPD. Ces travaux confirment la capacité de la spectroscopie IRTF à discriminer des souches de Candida au niveau de l’espèce mais également de la souche lors d’un typage ou d’une étude clinique. Au-delà de son haut contenu en informations, la spectroscopie IRTF est rapide, fiable, peu coûteuse et peut représenter une approche nouvelle au diagnostic mycology
The@use of FTIR (micro)spectroscopy for the differentiation and identification of Candida yeasts of clinical origin has been evaluated. Ninety-six strains belonging to six different species have been tested for the differentiation process while strains from three species (C. Albicans, C. Glabrata, and C. Parapsilosis) have been used for the typing tests. Our results show that species differentiation isachievable by analysing both suspensions and microcolonies. A spectral data base consisting of 180 strains from six different Candida species frequently encountered in medical practice has been set up. The data base was then tested with unknown species from patients. An identification score of 100% was achieved for four of the species. The lower score obtained for the other two species was explainedby the lack of representative spectra belonging to these strains in the initial data base. To demonstrate the feasibility of the method for strain typing, two clinical studies were conducted. The first study reports on to the longitudinal follow-up of C. Glabrata strains in an intensive care patient and the second concerns an epidemiological study where 13 C. Glabrata strains isolated from four differentpatients were investigated. In both cases, the FTIR results excluded an inter-human transmission. This was further confirmed by RAPD technique. These results confirm the potentials of (micro)FTIR spectroscopy to discriminate Candida strains both at species and strain levels. Besides its high information content, FTIR spectroscopy is a rapid, reliable, and low-cost technique and can be foreseen as a new diagnostic approach in medical mycology
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Essendoubi, Mohammed Sockalingum Dhruvananda Ganesh. "Identification et typage par (micro) spectroscopie IRTF des levures du genre Candida d'origine clinique." S.n. : S.l, 2007. http://scdurca.univ-reims.fr/exl-doc/GED00000629.pdf.

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Dumas, Severine. "Dosage du polymorphisme : spectrométrie IRTF et chimiométrie. Application aux formes polymorphes du CL20 (Hexaazahexanitroisowurtzitane / HNIW)." Phd thesis, Université Claude Bernard - Lyon I, 2003. http://tel.archives-ouvertes.fr/tel-00352294.

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L'HexaazahexaNitroIsoWurtzitane (ou HNIW), dérivé hexanitré, encore appelé CL20, est une nouvelle molécule hautement énergétique, qui présente quatre formes polymorphes : α, β, γ et ε. La forme ε est la plus active et la commercialisation stipule de fournir un produit dont la teneur en forme ε soit supérieure à 95%, avec estimation des teneurs des autres formes ainsi que de l'impureté majoritaire (dérivé pentanitré). L'objet du présent travail est d'une part de caractériser les différentes formes polymorphes, et d'autre part de mettre au point, d'optimiser et de valider une méthode d'analyse quantitative du CL20 polymorphe par couplage spectro-métrie IRTF/chimiométrie, respectant les impératifs techniques et commerciaux et transférable sur site industriel. Les méthodes chimiométriques sont utilisées pour concevoir l'expérimentation et traiter l'information expérimentale nécessaire (étalonnage et validation).
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Books on the topic "IRTF"

1

Vuoristo, Sari. Irti: Novelleja. Jyväskylä: Gummerus, 1998.

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Alonso, Roberto Alonso. IRPF casos prácticos. Madrid [Spain]: Centro de Estudios Financieros, 2009.

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Roberto, Alonso Alonso, and Centro de Estudios Financieros. Gabinete Jurídico., eds. IRPF casos prácticos. Madrid [Spain]: Centro de Estudios Financieros, 2009.

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Khalaf, Munīr Muḥammad. Janāzat al-irth. Al-Qāhirah: [s.n., 2007.

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Spain. Código del IRPF. Elcano (Navarra): Aranzadi Editorial, 2000.

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Carolyn, Noble, ed. B irth stories. Charnwood, ACT: Ginninderra Press, 2001.

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Estalella, Jordi Solé. El IRPF inteligible. Madrid: Marcial Pons, 2013.

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Irtă kȯt︠h︡: Shigyrt︠h︡ar. Ȯfȯ: Kitap, 2017.

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Irth al-ḥikāyah. Madīnat Naṣr, al-Qāhirah: Dār al-Shurūq, 2014.

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al-Raḥīm, Aḥmad Muḥammad ʻAbd. Muʻānāt wa-irth. [Cairo: s.n., 1987.

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Book chapters on the topic "IRTF"

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Dimitrov, Dimiter M. "CTT-IRT." In D-scoring Method of Measurement, 39–44. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003343004-3.

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Shinde, Suhas Vishwasrao. "PVT Insensitive IREF Generation." In Transactions on Engineering Technologies, 195–204. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9588-3_15.

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Wu, Margaret, Hak Ping Tam, and Tsung-Hau Jen. "Multidimensional IRT Models." In Educational Measurement for Applied Researchers, 283–97. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-3302-5_15.

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Bock, R. Darrell, and Michele F. Zimowski. "Multiple Group IRT." In Handbook of Modern Item Response Theory, 433–48. New York, NY: Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4757-2691-6_25.

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Dimitrov, Dimiter M. "DSM-IRT Connections." In D-scoring Method of Measurement, 110–21. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003343004-12.

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Matsumoto, T. "Infrared Telescope in Space: IRTS." In Infrared and Submillimeter Space Missions in the Coming Decade, 73–79. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0363-3_9.

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Matsumoto, Toshio. "IRTS: Infrared Telescope in Space." In Observatories in Earth Orbit and Beyond, 215–22. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3454-5_24.

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Fabbricatore, Rosa, and Francesco Palumbo. "Clustering students according to their proficiency: a comparison between different approaches based on item response theory models." In Proceedings e report, 43–48. Florence: Firenze University Press, 2021. http://dx.doi.org/10.36253/978-88-5518-461-8.09.

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Evaluating learners' competencies is a crucial concern in education, and home and classroom structured tests represent an effective assessment tool. Structured tests consist of sets of items that can refer to several abilities or more than one topic. Several statistical approaches allow evaluating students considering the items in a multidimensional way, accounting for their structure. According to the evaluation's ending aim, the assessment process assigns a final grade to each student or clusters students in homogeneous groups according to their level of mastery and ability. The latter represents a helpful tool for developing tailored recommendations and remediations for each group. At this aim, latent class models represent a reference. In the item response theory (IRT) paradigm, the multidimensional latent class IRT models, releasing both the traditional constraints of unidimensionality and continuous nature of the latent trait, allow to detect sub-populations of homogeneous students according to their proficiency level also accounting for the multidimensional nature of their ability. Moreover, the semi-parametric formulation leads to several advantages in practice: It avoids normality assumptions that may not hold and reduces the computation demanding. This study compares the results of the multidimensional latent class IRT models with those obtained by a two-step procedure, which consists of firstly modeling a multidimensional IRT model to estimate students' ability and then applying a clustering algorithm to classify students accordingly. Regarding the latter, parametric and non-parametric approaches were considered. Data refer to the admission test for the degree course in psychology exploited in 2014 at the University of Naples Federico II. Students involved were N=944, and their ability dimensions were defined according to the domains assessed by the entrance exam, namely Humanities, Reading and Comprehension, Mathematics, Science, and English. In particular, a multidimensional two-parameter logistic IRT model for dichotomously-scored items was considered for students' ability estimation.
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Wu, Margaret, Hak Ping Tam, and Tsung-Hau Jen. "Two-Parameter IRT Models." In Educational Measurement for Applied Researchers, 187–205. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-3302-5_10.

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Turner, Barry. "International Road Federation (IRF)." In The Stateman’s Yearbook, 50. London: Palgrave Macmillan UK, 2007. http://dx.doi.org/10.1007/978-1-349-74024-6_41.

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Conference papers on the topic "IRTF"

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Smith, Steven S., and Peter M. Onaka. "NASA IRTF tip-tilt secondary system." In Optical Science, Engineering and Instrumentation '97, edited by Hilton Lewis. SPIE, 1997. http://dx.doi.org/10.1117/12.278828.

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Lakdashti, A., M. S. Moin, and K. Badie. "IRTF: Image Retrieval through Fuzzy Modeling." In 2008 IEEE International Conference on Communications. IEEE, 2008. http://dx.doi.org/10.1109/icc.2008.97.

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Toomey, Douglas W., Werner E. Stahlberger, and Darryl Y. Watanabe. "Cryostat design and construction at the IRTF." In 1994 Symposium on Astronomical Telescopes & Instrumentation for the 21st Century, edited by David L. Crawford and Eric R. Craine. SPIE, 1994. http://dx.doi.org/10.1117/12.176773.

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Denault, Anthony J. "Description of the NASA IRTF instrumentation software." In 1994 Symposium on Astronomical Telescopes & Instrumentation for the 21st Century, edited by David L. Crawford and Eric R. Craine. SPIE, 1994. http://dx.doi.org/10.1117/12.176791.

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O'Connor, Daniel J., J. Elon Graves, Malcolm J. Northcott, Douglas W. Toomey, Robert D. Joseph, and J. C. Shelton. "Curvature-based adaptive optics for the NASA IRTF." In Astronomical Telescopes and Instrumentation, edited by Peter L. Wizinowich. SPIE, 2000. http://dx.doi.org/10.1117/12.390295.

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Pilger, Eric J., James V. Harwood, and Peter M. Onaka. "Modernization of the NASA IRTF Telescope Control System." In 1994 Symposium on Astronomical Telescopes & Instrumentation for the 21st Century, edited by David L. Crawford and Eric R. Craine. SPIE, 1994. http://dx.doi.org/10.1117/12.176793.

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Rayner, John T., Douglas W. Toomey, Peter M. Onaka, Anthony J. Denault, Werner E. Stahlberger, Darryl Y. Watanabe, and Shu-i. Wang. "SpeX: a medium-resolution IR spectrograph for IRTF." In Astronomical Telescopes & Instrumentation, edited by Albert M. Fowler. SPIE, 1998. http://dx.doi.org/10.1117/12.317273.

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Bus, Schelte J., Anthony J. Denault, John T. Rayner, Richard P. Binzel, and Mirel Birlan. "Remote observing at the NASA Infrared Telescope Facility (IRTF)." In Astronomical Telescopes and Instrumentation, edited by Robert I. Kibrick. SPIE, 2002. http://dx.doi.org/10.1117/12.461175.

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Toomey, Douglas W., Christ Ftaclas, Robert H. Brown, and David Trilling. "CoCo: an experiment in infrared coronagraphy at the IRTF." In Astronomical Telescopes & Instrumentation, edited by Albert M. Fowler. SPIE, 1998. http://dx.doi.org/10.1117/12.317214.

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Onaka, Peter M., and Anthony J. Denault. "NASA IRTF design proposal for large-format infrared array controller electronics." In 1994 Symposium on Astronomical Telescopes & Instrumentation for the 21st Century, edited by David L. Crawford and Eric R. Craine. SPIE, 1994. http://dx.doi.org/10.1117/12.176792.

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Reports on the topic "IRTF"

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Weinrib, A., and J. Postel. IRTF Research Group Guidelines and Procedures. RFC Editor, October 1996. http://dx.doi.org/10.17487/rfc2014.

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Dawkins, S., ed. An IRTF Primer for IETF Participants. RFC Editor, December 2014. http://dx.doi.org/10.17487/rfc7418.

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Eggert, L. The Role of the IRTF Chair. RFC Editor, March 2016. http://dx.doi.org/10.17487/rfc7827.

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Alvestrand, H., and R. Housley. IESG Procedures for Handling of Independent and IRTF Stream Submissions. RFC Editor, December 2009. http://dx.doi.org/10.17487/rfc5742.

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Falk, A. Definition of an Internet Research Task Force (IRTF) Document Stream. RFC Editor, December 2009. http://dx.doi.org/10.17487/rfc5743.

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Floyd, S., V. Paxson, and A. Falk, eds. IAB Thoughts on the Role of the Internet Research Task Force (IRTF). RFC Editor, March 2006. http://dx.doi.org/10.17487/rfc4440.

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Hoffman, P. Datatracker States and Annotations for the IAB, IRTF, and Independent Submission Streams. RFC Editor, July 2011. http://dx.doi.org/10.17487/rfc6322.

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Bubbers, Lex. Task Force Fox and IRTF(L) - Reinforce: The Partner to Improve Time-Critical Operations. Fort Belvoir, VA: Defense Technical Information Center, June 2004. http://dx.doi.org/10.21236/ada465954.

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Tschofenig, H., L. Eggert, and Z. Sarker. Report from the IAB/IRTF Workshop on Congestion Control for Interactive Real-Time Communication. RFC Editor, July 2014. http://dx.doi.org/10.17487/rfc7295.

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Morris, Victor R. Infrared Thermometer (IRT) Instrument Handbook. Office of Scientific and Technical Information (OSTI), January 2018. http://dx.doi.org/10.2172/1417312.

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