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Горюшкина, Алла Эрнестовна. "Метод управления информационными потоками в компьютеризированной системе на основе преобразования Хартли." Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/23298.
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Диссертация на соискание ученой степени кандидата технических наук по специальности 05.13.05 – компьютерные системы и компоненты. – Национальный технический университет "Харьковский политехнический институт", 2016 г.
Диссертация посвящена разработке научных подходов к повышению быстродействия передачи мультимедийных данных в компьютерных сетях авиатранспортного комплекса. На основании изучения современных методов передачи данных установлено, что в условиях повышенной интенсивности большого объема потока данных, используемые в настоящее время методы сжатия и управления компьютерными ресурсами не позволяют обеспечить быстродействие при передаче мультимедийных данных в компьютерных сетях авиатранспортного комплекса. Исследование основных методов сжатия и алгоритмов управления компьютерными ресурсами позволили определить основные направления научного исследования и сформулировать задачу повышения быстродействия передачи мультимедийных данных в компьютерных сетях авиатранспортного комплекса. Обоснован выбор дискретного преобразования Хартли в качестве основного при разработке модели сжатия данных. Определена взаимосвязь между дискретным преобразованием Хартли и методом моментов. Решается задача усовершенствования дискретного преобразования Хартли для сжатия данных, путем применения новой системы расчета, в основу которой положен метод моментов, а именно модульное сопоставление функций. Разработанная систолическая система вычисления одномерного дискретного преобразования Хартли позволяет снизить вычислительную сложность алгоритма до 7-10 %. Предложенный в работе метод динамического управления ресурсами компьютерной системы систем критического применения, основанный на модели прогнозирования краткосрочной нагрузки и распределения компьютерных ресурсов позволяет учесть свойства фрактальности компьютерных сетевых структур авиатранспортного комплекса и повысить быстродействие передачи данных до 1.4 раз. Для обоснования достоверности полученных результатов проведено имитационное моделирование процесса сжатия данных и управления ресурсами в компьютерных сетях систем критического применения. Показано, что большинстве предложенных тестовых ситуаций "расчетные" кривые, полученные в соответствии с разработанной в работе математической моделью, в большинстве практических случаев попадают в "усредненный" доверительный интервал. Высокая степень совпадения результатов имитационного и математического моделирования подтверждают достоверность разработанной математической модели подсистемы сжатия данных, прогнозирования и управления в компьютерных сетях авиатранспортного комплекса.The dissertation on competition of a scientific degree of candidate of technical Sciences in specialty 05.13.05 – computer systems and components. – National technical University "Kharkiv Polytechnic Institute", Kharkov, 2016 The thesis is devoted to improve performance of multimedia data transfer in computer networks, air transport infrastructure. Based on the study of modern methods of transmitting data is established that in conditions of high intensity large volume of data flow, the currently used compression techniques and management of computer resources do not allow to provide efficiency in the transmission of multimedia data in computer networks, air transport infrastructure. The choice of the discrete Hartley transform as the core in developing the model statku multimedia data. Establishes the relationship between the discrete Hartley transform and Hartley method. It is determined that the systolic system for the computation of one-dimensional discrete Hartley transform allows to reduce the computational complexity of the algorithm to 7 -10%. The developed method of dynamic resource management computer system aviation complex model-based forecasting of short term loads and the distribution of computing resources, which allowed us to consider the properties of fractal network structures in the air transport sector and to improve performance of multimedia data transfer in 1.4 times and develop automated software tool for information management in computer networks with the features of multimedia content.
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Gray, Mason J. "Electronic Spectroscopy of Topological Superconductor FeTe_{0.55}Se_{0.45}:." Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109190.
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Thesis advisor: Kenneth S. BurchIn condensed matter physics we study the behavior of crystals at finite density and low temperatures. By tuning and breaking the various materials, symmetries, and the topology of a crystal one can bring about brand new quantum phases of matter. These new phases of matter in turn produce emergent quasiparticles such as the cooper pair in superconductivity, the spinon in magnetic systems, and the Fermi arcs in Weyl semimetals. Of particular interest are systems in which superconductivity interacts with topology. These systems have been theoretically predicted to produce anyonic quasiparticles which may be used as qubits in a future fault-tolerant quantum computer. However, these ideas usually require the use of the superconducting proximity effect to inject cooper pairs into the topological system. This in turn requires interfacing two different materials which not only requires extremely clean interfaces, but also matching Fermi surfaces, comparable Fermi velocities, and more. The ideal candidate for topological superconductivity would therefore be a material that is both superconducting and topologically non-trivial. One promising candidate is the iron-based superconductor FeTe(1−x)Sex, specifically at the FeTe0.55Se0.45 (FTS) doping which also has non-trivial topology. In this dissertation, we address the fabrication of pristine interfaces using a new tool as well as new probes into the topology of FTS. In Chapter II we discuss the motivation, construction, and use of the “cleanroomin-a-glovebox”. This tool places an entire nanofabrication workflow into an inert argon atmosphere which has allowed us access to study a myriad of new materials and systems. A delightful offshoot of this glovebox is that it is a useful tool in training new scientists in fabrication techniques. The photolithography, Physical Vapor Deposition (PVD), and characterization tools in the glovebox are designed to be easy to use and thus afford new users a low-risk method of learning new techniques. In chapter III we discuss a specific example of a new quantum phase of matter e.g. topological superconductivity in FTS. There, I discuss the fabrication requirements to probe this elusive phase as well as the unique measurement technique used to provide evidence that FTS is a higher-order topological superconductor. The characterization of FTS continues in Chapter IV where we reveal some exciting new results in the FTS system. These new results are direct evidence for the topological nature of FTS, a feat which has only been shown in Angle-Resolved Photo Emission Spectroscopy (ARPES) and Scanning Tunneling Microscopy (STM). Chapter V concludes the dissertation with a summary of Chapters II, III, and IV. In addition, we give suggestions for future experiments to investigate the FTS system further as well as suggestions for insightful teaching programs with the cleanroom-in-a-glovebox
Thesis (PhD) — Boston College, 2021
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics
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Blėdis, Donatas. "Gedimų elektros tinklų 0,4-10 kV linijose tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120702_125908-80721.
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Šiame darbe nagrinėjamos skirstomojo tinklo 0,4- 10 kV linijų gedimų problemos, remiantis mokslinės literatūros analize ir praktinio darbo patirties apibendrinimu. Nustatomi Šiaulių regiono kiekvieno rajono elektros tinklų 0,4-10 kV linijų gedimų skaičius, atjungtų vartotojų skaičius, atjungimų trukmės ir priežastys. Apskaičiuojami Šiaulių regiono kiekvieno rajono elektros tinklo patikimumo rodikliai, daugiausiai gendančios elektros linijos parengties ir priverstinės prastovos koeficientai bei veikimo ir gedimo tikimybės per 12 mėnesių.This paper deals with the distribution network of 0.4 and 10 kV line fault problems based on the scientific literature and practical experience. The number of faults, the number of disconnections, the disconnections times and reasons of 0.4-10 kV grid lines of Šiauliai region have been investigated. Reliability indicators of electrical network of Šiauliai region have been calculated. Working and failure probabilities of the electrical network during 12 months have been calculated.
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Souza, Randy. "Evaluation of compact FELS operating at 0.4 micron wavelength." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA245761.
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Thesis (M.S. in Physics)--Naval Postgraduate School, December 1990.Thesis Advisor(s): Colson, W. B. Second Reader: Woehler, Karlheinz E. "December 1990." Description based on title screen as viewed on March 29, 2010 DTIC Descriptor(s): Free Electron Lasers, Electrodynamics, Optical Properties, Optics, Computations, Degradation, Physical Properties, Harmonics, Numerical Analysis, Saturation, Coding, Electron Beams, Physics, Low Energy, Gain, Numerical Methods And Procedures, Short Wavelengths, Computer Programs, Frequency DTIC Identifier(s): Free Electron Lasers, Theses, Wiggler Magnets, Undulators Author(s) subject terms: FEL, Undulator, Harmonics, Oscillator, Accelerator, Gain. Includes bibliographical references (p. 71-73). Also available in print.
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Vander, Schueren Michael. "Safety assessment of microwave radar breast imaging in the 0.434-9 GHz range." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104629.
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In recent years, microwave imaging has become a possible candidate for the early detection of breast cancer. Due to the different water content, there exists a dielectric contrast between malignant and healthy breast tissue at microwave frequencies. In addition, breast tumours appear relatively close to the skin surface, allowing low-power microwaves to penetrate through the tissue with a loss that is acceptably low to permit for a radar-like detection approach. While this imaging modality is relatively new, and a few prototypes have been reported, not many publications consider its safety. This work studies the exposure of a breast in the far field of radiofrequency sources operating in the 0.434-9-GHz range to assess the safety of a basic radar microwave imaging system. The electromagnetic fields inside a realistic MRI-derived 3-D numerical breast model has been computed using the finite-difference time-domain (FDTD) method with the help of SEMCAD-X (Schmid & Partner Engineering AG), a 3-D FDTD solver. It was used to model the resulting Specific Absorption Rate (SAR) of the breast tissue exposed to a plane wave. Experimental results are presented and discussed to determine whether they comply with exposure limits from Health's Canada Safety Code 6.Ces dernières années, l'imagerie par micro-ondes est devenue un candidat possible pour la détection précoce du cancer du sein. En raison de la teneur en eau différentes, il existe un contraste diélectrique entre les tissus mammaires malins et ceux en bonne santé à des fréquences micro-ondes. En outre, les tumeurs du sein sont généralement relativement proches de la surface de la peau, permettant aux micro-ondes de faible puissance de pénétrer à travers les tissus avec une perte qui est suffisamment faible, afin de permettre une approche de détection de type radar. Bien que cette modalité d'imagerie est relativement nouvelle, et quelques prototypes ont été signalés, peux de publications envisages leur sécurité.Ce travail étudie l'exposition d'un sein à une source émettant des micro-ondes à une grande distance, fonctionnant de 0,434 à 9 GHz pour évaluer la sécurité d'un système d'imagerie radar de base. Les champs électromagnétiques dans un modèle 3-D numérique réaliste du sein, dérivés par résonances magnétiques (IRM), ont été calculés en utilisant la méthode des différences finies dans le domaine temporel (FDTD) avec l'aide de SEMCAD-X (Schmid & Partner Engineering AG), un solveur FDTD 3-D. Il a été utilisé pour modeler le débit d'absorption spécifique résultant d'un tissu mammaire exposé à une onde plane. Les résultats expérimentaux sont présentés et discutés afin de déterminer s'ils sont conformes aux limites d'exposition de la Santé du Canada Code de sécurité 6.
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Hatami, Fariba. "Indium phosphide quantum dots in GaP and in In 0.48 Ga 0.52 P." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2002. http://dx.doi.org/10.18452/14873.
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Im Rahmen dieser Arbeit wurden selbstorganisierte, verspannte InP-Quantenpunkte mittels Gasquellen-Molekularstrahlepitaxie hergestellt und deren strukturelle und optische Eigenschaften untersucht. Die Quantenpunkte wurden sowohl in InGaP-Matrix gitterangepasst auf GaAs-Substrat als auch in GaP-Matrix auf GaP-Substrat realisiert. Die starke Gitterfehlanpassung von 3,8% im InP/InGaP- bzw. 7,7% im InP/GaP-Materialsystem ermöglicht Inselbildung mittels des Stranski-Krastanow-Wachstumsmodus: Ab einer kritischen InP-Schichtdicke findet kein zweidimensionales, sondern ein dreidimensionales Wachstum statt. Die kritische Schichtdicke wurde mit etwa 3 Monolagen für das InP/InGaP- und mit etwa 1,8 Monolagen für das InP/GaP-System bestimmt. Die strukturellen Untersuchungen zeigen, dass InP Quantenpunkte in GaP im Vergleich zu solchen in InGaP größer sind und stärker zum Abbau von Verspannung tendieren. Die in InGaP-Matrix eingebettete InP-Quantenpunkte zeigen sehr ausgeprägte optische Emissionen, die, in Abhängigkeit von den Wachstumsparametern, im Bereich von 1,6 bis 1,75eV liegen. Die Emissionslinie wird der strahlenden Rekombination von in den Quantenpunkten lokalisierten Elektronen und Löchern zugeordnet. Dies wird auch durch das Bänderschema bestätigt, das mit Hilfe der Model-Solid-Theorie modelliert wurde. Darüber hinaus weist die Lebensdauer der Ladungsträger von einigen hundert Pikosekunden darauf hin, dass die InP/InGaP Quantenpunkte vom Typ I sind. Zusätzlich zu den optischen Eigenschaften wurde die Anordnung von dicht gepackten InP-Quantenpunkten in und auf InGaP mittels zweidimensionaler Fourier-Transformation der Daten aus der Atomkraftmikroskopie, Transmissionelektronmikroskopie und diverser Röntgen-Streuexperimente untersucht sowie die planaren und vertikale Ordnungseffekte der Quantenpunkte studiert. Die Untersuchungen zeigen, dass die Ordnung der Quantenpunkte sowohl hinsichtlich ihrer Packungsdichte als auch ihrer Orientierung mit wachsender InP-Bedeckung zunimmt. Darüber hinaus wurde die Verspannungsverteilung in den InP/InGaP-Quantenpunkten mit Hilfe von diffuser Röntgen-Streuung in Verbindung mit kinematischen Simulationen studiert und eine asymmetrische Form der Quantenpunkte festgestellt, die auch Ursache für die gemessene Polarisationsanisotropie der Photolumineszenz sein kann. Die in GaP-Matrix eingebetteten InP-Quantenpunkte wurden im Rahmen dieser Arbeit erstmals erfolgreich auf ihre aktiven optischen Eigenschaften hin untersucht. Sie zeigen eine optische Emission zwischen 1,9 und 2 eV im sichtbaren Bereich. Diese strahlende Rekombination wird ebenfalls dem direkten Übergang zwischen Elektronen- und Löcherzuständen zugeordnet, die in den InP Quantenpunkten lokalisiert sind. Auch Photolumineszenzmessungen unter mechanischem Druck weisen darauf hin, dass es sich in diesem System hauptsächlich um einen direkten räumlichen Übergang handelt. Dieses Ergebnis wird dadurch untermauert, dass die Lebensdauer der Ladungsträger im Bereich von etwa 2 ns liegt, was nicht untypisch für Typ-I-Systeme ist. Die Ergebnisse für zweidimensionale, in GaP eingebettete InP-Schichten zeigen im Gegensatz zu den Quantenpunkten, dass die strahlende Rekombination in InP/GaP Quantentöpfen aufgrund eines indirekten Übergangs (sowohl in Orts- als auch in Impulsraum) zwischen Elektronen- und Löcherzuständen erfolgt. Die optischen Emissionslinien liegen für Quantentöpfe im Bereich von 2,15 bis 2,30eV. Die nachgewiesene sehr lange Lebensdauer der Ladungsträger von etwa 20ns weist weiter darauf hin, dass die Quantentöpfe ein Typ-II-System sind. Nach Modellierung des Bänderschemas für das verspannte InP/GaP-System und Berechnung der Energieniveaus von Löchern und Elektronen darin mit Hilfe der Effektive-Masse-Näherung in Abhängigkeit von der InP-Schichtdicke zeigt sich ferner, dass für InP-Quantentöpfe mit einer Breite kleiner als 3nm die Quantisierungsenergie der Elektronen so groß ist, dass der X-Punkt in GaP energetisch tiefer liegt als der Gamma-Punkt in InP. Dieser Potentialverlauf führt dazu , dass die Elektronen im X-Minimum des GaP lokalisieren, während die Löcher in der InP-Schicht bleiben. Optische Untersuchungen nach thermischer Behandlung der Quantenpunkte führen sowohl im InP/InGaP- als auch im InP/GaP-System zur Verstärkung der Lumineszenz, die bis zu 15 mal internsiver als bei unbehandelten Proben sein kann. Insgesamt zeigt diese Arbeit, dass InP-Quantenpunkte durch ihre optischen Eigenschaften sehr interessant für optoelektronische Anwendungen sind. Die Verwendung von durchsichtigem GaP (mit einer größeren Bandlücke und kleineren Gitterkonstante im Vergleich zu GaAs und InGaP) als Matrix und Substrat hat nicht nur den Vorteil, dass die InP-Quantenpunkte hierbei im sichtbaren Bereich Licht emittieren, sondern man kann in der Praxis auch von einer hochentwickelten GaP-basierten LED-Technologie profitieren. Hauptergebnis dieser Arbeit ist, dass die in indirektes GaP eingebetteten InP-Quantenpunkte aktive optische Eigenschaften zeigen. Sie können daher als aktive Medien zur Realisierung neuartiger effizienter Laser und Leuchtdioden verwendet werden.The growth and structural properties of self-assembled InP quantum dots are presented and discussed, together with their optical properties and associated carrier dynamics. The QDs are grown using gas-source molecular-beam epitaxy in and on the two materials InGaP (lattice matched to GaAs) and GaP. Under the proper growth conditions, formation of InP dots via the Stranski-Krastanow mechanism is observed. The critical InP coverage for 2D-3D transition is found to be 3ML for the InP/ InGaP system and 1.8ML for the InP/GaP system. The structural characterization indicates that the InP/GaP QDs are larger and, consequently, less dense compared to the InP/ InGaP QDs; hence, InP dots on GaP tend to be strain-relaxed. The InP/ InGaP QDs tend to form ordered arrays when InP coverage is increased. Intense photoluminescence from InP quantum dots in both material systems is observed. The PL from InP/GaP QDs peaks between 1.9 and 2 eV and is by about 200 meV higher in energy than the PL line from InP/ InGaP QDs. The optical emission from dots is attributed to direct transitions between the electrons and heavy-holes confined in the InP dots, whereas the photoluminescence from a two-dimensional InP layer embedded in GaP is explained as resulting from the spatially indirect recombination of electrons from the GaP X valleys with holes in InP and their phonon replicas. The type-II band alignment of InP/GaP two-dimensional structures is further confirmed by the carrier lifetime above 19 ns, which is much higher than in type-I systems. The observed carrier lifetimes of 100-500 ps for InP/ InGaPQDs and 2 ns for InP/GaP QDs support our band alignment modeling. Pressure-dependent photoluminescence measurements provide further evidence for a type-I band alignment for InP/GaP QDs at normal pressure, but indicate that they become type-II under hydrostatic pressures of about 1.2 GPa and are consistent with an energy difference between the lowest InP and GaP states of about 31 meV. Exploiting the visible direct-bandgap transition in the GaP system could lead to an increased efficiency of light emission in GaP-based light emitters.
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Cheng, Kit Yee. "The optical characterization of 0.4 nm single-walled carbon nanotubes /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202003%20CHENGK.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 91-92). Also available in electronic version. Access restricted to campus users.
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Mok, Siu Man. "Low-temperature Raman spectroscopy of 0.4 nm single-walled carbon nanotubes /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20MOK.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.Includes bibliographical references (leaves 144-145). Also available in electronic version. Access restricted to campus users.
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Goorhuis, Jolande. "0.25 [percent] and 0.4 [percent] amine fluoride gel for topical application /." [S.l : s.n.], 1986. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
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Sandora, John Samuel. "Design of the Electroscience Lab's 0.4-100GHZ compact range radar system." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1302888385.
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Pickering, Ethan M. "EDIFES 0.4: Scalable Data Analytics for Commercial Building Virtual Energy Audits." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1467986734.
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Zerbetto, Sandra Cristina. "Lasers moleculares na faixa de 0.4 à 11THz e aplicações à espectroscopia." [s.n.], 1995. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277750.
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Orientador: Elza da Costa Cruz VasconcellosTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica "Gleb Wataghin"
Made available in DSpace on 2018-07-21T18:08:19Z (GMT). No. of bitstreams: 1 Zerbetto_SandraCristina_D.pdf: 2654694 bytes, checksum: a96667eb3ce9962a3333bc969eae8fe1 (MD5) Previous issue date: 1996
Resumo: No presente trabalho, foram descobertas importantes linhas laser no infravermelho longínquo (IVL) a partir do bombeamento óptico com lasers de CO2. Importantes meios ativos, como o metanol e a hidrazina, foram investigados utilizando novas frequências de bombeamento disponíveis e uma nova cavidade ressonante no IVL com alto ganho para comprimentos de onda menores que 150 mm. Nestas condições, um número significante de linhas laser foram observadas na faixa de frequências entre 0.4 e 11 THz. Também obtivemos sucesso na identificação das transições laser nos meios ativos CH3OH e 13CH3OH, e medimos em absorção algumas das mais importantes linhas laser IVL com a utilização de um espectrômetro sintonizável no infravermelho longínquo
Abstract: We discovered many important laser lines from optically pumped far-infrared (FIR) lasers and measured their frequencies. Important active media, such as methanol and hydrazine, were investigated by using the extended line coverage available from an efficient CO2 laser design recently developed for optical pumping, and a new FIR laser cavity with high gain for wavelengths shorter than 150 mm. Under these conditions, a significant number of new lines were observed in the 3-11 THz region. These lines will help to fill the gap in this spectral region, and will be useful for applications in high resolution spectroscopy. Also, we succesfully assigned laser transitions in CH3OH and 13CH3OH, and measured in absorption several important laser transitions with the use of a tunable far-infrared (TuFIR) laser spectrometer
Doutorado
Física
Doutor em Ciências
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Zahedy, Fakhri S., Hsiao-Wen Chen, Michael Rauch, and Ann Zabludoff. "HST Detection of Extended Neutral Hydrogen in a Massive Elliptical at z = 0.4." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/625809.
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We report the first detection of extended neutral hydrogen (H I) gas in the interstellar medium (ISM) of a massive elliptical galaxy beyond z similar to 0. The observations utilize the doubly lensed images of QSO HE 0047-1756 at z(QSO) = 1.676 as absorption-line probes of the ISM in the massive (M-star approximate to 10(11) M-circle dot) elliptical lens at z = 0.408, detecting gas at projected distances of d = 3.3 and 4.6 kpc on opposite sides of the lens. Using the Space Telescope Imaging Spectrograph, we obtain UV absorption spectra of the lensed QSO and identify a prominent flux discontinuity and associated absorption features matching the Lyman series transitions at z = 0.408 in both sightlines. The H I column density is log N(H I)= 19.6-19.7 at both locations across the lens, comparable to what is seen in 21 cm images of nearby ellipticals. The H I gas kinematics are well-matched with the kinematics of the Fe II absorption complex revealed in ground-based echelle data, displaying a large velocity shear of approximate to 360 km s(-1) across the galaxy. We estimate an ISM Fe abundance of 0.3-0.4 solar at both locations. Including likely dust depletions increases the estimated Fe abundances to solar or supersolar, similar to those of the hot ISM and stars of nearby ellipticals. Assuming 100% covering fraction of this Fe-enriched gas, we infer a total Fe mass of M-cool(Fe) similar to (5-8) x 10(4) M-circle dot in the cool ISM of the massive elliptical lens, which is no more than 5% of the total Fe mass observed in the hot ISM.
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Phinney, Lucas C. "Thorium and Uranium M-shell X-ray Production Cross Sections for 0.4 – 4.0 MeV Protons, 0.4 - 6.0 MeV Helium Ions, 4.5 – 11.3 MeV Carbon Ions, and 4.5 – 13.5 MeV Oxygen Ions." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc68032/.
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The M-shell x-ray production cross section for thorium and uranium have been determined for protons of energy 0.4 - 4.0 MeV, helium ions of energy 0.4 - 6.0 MeV, carbon ions of energy 4.5 - 11.3 MeV and oxygen ions of energy 4.5 - 13.5 MeV. The total cross sections and the cross sections for individual x-ray peaks in the spectrum, consisting of the following transitions Mz (M4-N2, M5-N3, M4-N3), Ma (M5-N6,7), Mb (M4-N6, M5-O3, M4- O2), and Mg (M4-O3, M5-P3, M3-N4, M3-N5), were compared to the theoretical values determined from the PWBA + OBKN and ECUSAR. The theoretical values for the carbon and oxygen ions were also modified to take into account the effects of multiple ionizations of the target atom by the heavier ions. It is shown that the results of the ECUSAR theory tend to provide better agreement with the experimental data.
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Kranert, Christian, Jörg Lenzner, Marcus Jenderka, Michael Lorenz, Wenckstern Holger von, Rüdiger Schmidt-Grund, and Marius Grundmann. "Lattice parameters and Raman-active phonon modes of (InxGa1–x)2O3 for x < 0.4." American Institute of Physics, 2014. https://ul.qucosa.de/id/qucosa%3A31217.
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We present X-ray diffraction and Raman spectroscopy investigations of (InxGa1–x)2O3 thin films
and bulk-like ceramics in dependence of their composition. The thin films grown by pulsed laser
deposition have a continuous lateral composition spread allowing the determination of phonon
mode properties and lattice parameters with high sensitivity to the composition from a single 2-in.
wafer. In the regime of low indium concentration, the phonon energies depend linearly on the composition
and show a good agreement between both sample types. We determined the slopes of these
dependencies for eight different Raman modes. While the lattice parameters of the ceramics follow
Vegard’s rule, deviations are observed for the thin films. Further, we found indications of the highpressure
phase InGaO3 II in the thin films above a critical indium concentration, its value depending
on the type of substrate.
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Langa, Mihloti Christina. "An investigation into the variability of methanol and hydroxyl masers in the star-forming region G12.89+0.49 / Mihloti Christina Langa." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1700.
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Hamilton, J. C. "de l'émission du ciel à 0.4 meV et au delà de l'EeV : cosmologie et rayons cosmiques." Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2009. http://tel.archives-ouvertes.fr/tel-00706982.
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Cette habilitation a' diriger des recherches de ́crit les travaux de recherche que j'ai effectue ́s depuis ma soute- nance de the'se qui en 1999. Elle s'articule autour de deux parties correspondants aux deux the'mes scientifiques sur lesquels j'ai travaille ́ ces dernie'res anne ́es : les rayons cosmiques d'ultra-haute e ́nergie et l'e ́tude du fond diffus cosmologique. C'est au sein de la collaboration Pierre Auger que j'ai travaille ́ sur la the ́matique des rayons cosmiques ultra- e ́nerge ́tiques entre fin 2002 et fin 2006. Il s'agit la' du plus grand de ́tecteur jamais construit par l'homme destine ́ a' eclaircir un myste're vieux de plus d'un sie'cle : quelle est la nature, ou' sont produits, et comment se propagent lesrayonscosmiquesquel'onobservea'dese ́nergiesdequelques1019eV?enexiste-t-ilau-dela'delafameuse coupure GZK qui, du fait le la perte d'e ́nergie des rayons cosmiques aux plus hautes e ́nergies par inte ́raction avec le fond diffus cosmologique limite l'horizon a' quelques centaines de Mpc a' ces e ́nergies? Je de ́cris dans cette habilitation mes travaux d'analyse de donne ́es concernant d'une part la recherche d'e ́ventuelles aniso- tropies dans la distribution sur le ciel des rayons cosmiques (des anisotrpies aux petites e ́chelles permettant d'identifier les sources, et aux plus grandes e ́chelles pouvant signer divers sce ́narios, par exemple top-down si l'on observe un exce's en provenance du centre Galactique) et d'autre part sur sur la recherche de photons aux plus hautes e ́nergies, une des signatures les plus claires d'une origine top-down pour les rayons cosmques les plus e ́nerge ́tiques. Les re ́sultats ne ́gatifs de cette recherche de photons, ajoute ́s a' l'observation claire de la cou- pure GZK ont permis a' l'Observatoire Pierre Auger de trancher en faveur d'une origine bottom-up, c'est a' dire issue d'acce ́le ́rateurs cosmiques, pour les rayons cosmiques les plus e ́nerge ́tiques. Par ailleurs, aucune aniso- tropien'estpourl'heureobserve ́eauxplusgrandese ́chellesalorsquelesrayonscosmqieslespluse ́nerge ́tiques montrent une autocorre ́lation significative aux petites e ́chelles, en corre ́lation avec un catalogues d'AGN (dont la distribution spatiale est elle-meˆme corre ́le ́e au reste de la matie're, cela' ne signe donc pas les AGN comme sites d'acce ́le ́ration). J'ai commence ́ a' aborder la the ́matique des anisotropies du fond diffus cosmologique au cours de mon post- doctorat et de ma premie're anne ́e au CNRS au sein de l'e ́xperience Archeops, un projet ballon d'observation de latempe ́ratureetdelapolarisationdecerayonnementsavecuneinstrumentationsimilairea'celledePlanck-HFI. J'ai travaille ́ a' l'e ́laboration des cartes du ciel et a' l'extraction du spectre angulaire de puissance des fluctuations de tempe ́rature, permettant l'observation pre ́cise, avant WMAP, du premier pic acoustique, et la de ́termination des parame'tres cosmologiques. J'ai rejoint a' nouveau cette the ́matique fin-2006 au sein de la collaboration QU- BIC dont l'objectif est de ́tecter les modes-B de polarisation du fond diffus cosmologique. Ces derniers sont la signature d'ondes gravitationnelles primordiales, c'est a' dire de modes tenseurs engendre ́s par l'inflation. Leur de ́tection et la mesure de leur spectre est conside ́re ́e comme le Graal de la cosmologie contemporaine tant ont apprendrait sur les processus a' l'oeuvre dans l'Univers primordial : mesure de l'e ́chelle en e ́nergie de l'inflation, de ́termination de la forme du potentiel de l'inflaton, tests de cohe ́rence interne du mode'le inflationnaire. Ces modes-b de polarisation sont d'une amplitude si faible (en dessous du micro-Kelvin) qu'une nouvelle ge ́ne ́rtion d'intrumentsestrequisepourlesobserver:largesmatricesdebolome'tres(limite ́sparlebruitdephotons),design instrumental minimisant l'impact des effets syste ́matiques qui pourraient devenir dominants pour des de ́tecteurs aussi sensibles. Le projet QUBIC est base ́ sur le concept d'interfe ́rome ́trie bolome ́trique, combinant les avan- tages des bolome'tres en terme de sensibilite ́ et ceux des interfe ́rome'tres en terme de faible contamination par les effets syste ́matiques. Depuis pre's de trois ans, je travaille au de ́veloppement du concept instrumental d'un interfe ́rome'tre bolome ́trique : reconstruction des visibilite ́s de manie're optimale graˆce a' des modulateurs de phases, calcul de la sensibilite ́s et comparaison avec un imageur et un interfe ́rome'tre classique (montrant que nous avons en effet un interfe ́rome'tre plus sensible graˆce aux de ́tecteurs bolome ́triques) et enfin de ́termination du design optimal de l'instrument QUBIC afin d'atteindre notre objectif scientifique d'eˆtre en mesure d'exclure un rapport entre les modes tenseurs et scalaires de 0.01 a' 95% de niveau de confiance en un an. L'instrument ne ́cessaire est typiquement un ensemble de 6 modules d'interfe ́rome'tres comprenant chacun 144 cornets, une feneˆtre de 40 cm de diame'tre et un plan focal comprenant 900 bolome'tres avec une largeur de bande de 25%.
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Matthee, Jorryt, David Sobral, Philip Best, Ian Smail, Fuyan Bian, Behnam Darvish, Huub Röttgering, and Xiaohui Fan. "Boötes-HiZELS: an optical to near-infrared survey of emission-line galaxies at z = 0.4–4.7." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/625736.
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We present a sample of similar to 1000 emission-line galaxies at z = 0.4-4.7 from the similar to 0.7deg(2) High-z Emission-Line Survey in the Bootes field identified with a suite of six narrow-band filters at approximate to 0.4-2.1 mu m. These galaxies have been selected on their Ly alpha (73), [O (II)] (285), H beta/[O (III)] (387) or H alpha (362) emission line, and have been classified with optical to near-infrared colours. A subsample of 98 sources have reliable redshifts from multiple narrow-band (e.g. [O (II)]-H alpha) detections and/or spectroscopy. In this survey paper, we present the observations, selection and catalogues of emitters. We measure number densities of Ly alpha, [O (II)], H beta/[O (III)] and H alpha and confirm strong luminosity evolution in star-forming galaxies from z similar to 0.4 to similar to 5, in agreement with previous results. To demonstrate the usefulness of dual-line emitters, we use the sample of dual [O (II)]-H alpha emitters to measure the observed [O (II)]/H alpha ratio at z = 1.47. The observed [O (II)]/H alpha ratio increases significantly from 0.40 +/- 0.01 at z = 0.1 to 0.52 +/- 0.05 at z = 1.47, which we attribute to either decreasing dust attenuation with redshift, or due to a bias in the (typically) fibre measurements in the local Universe that only measure the central kpc regions. At the bright end, we find that both the H alpha and Ly alpha number densities at z approximate to 2.2 deviate significantly from a Schechter form, following a power law. We show that this is driven entirely by an increasing X-ray/active galactic nucleus fraction with line luminosity, which reaches approximate to 100 per cent at line luminosities L greater than or similar to 3 x 10(44) erg s(-1).
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Zahedy, Fakhri S., Hsiao-Wen Chen, Michael Rauch, Michelle L. Wilson, and Ann Zabludoff. "Probing the cool interstellar and circumgalactic gas of three massive lensing galaxies at z = 0.4–0.7." OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/614764.
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We present multisightline absorption spectroscopy of cool gas around three lensing galaxies at z = 0.4-0.7. These lenses have half-light radii r(e) = 2.6-8 kpc and stellar masses of log M-*/M-circle dot = 10.9-11.4, and therefore resemble nearby passive elliptical galaxies. The lensed QSO sightlines presented here occur at projected distances of d = 3-15 kpc (or d approximate to 1-2 r(e)) from the lensing galaxies, providing for the first time an opportunity to probe both interstellar gas at r similar to r(e) and circumgalactic gas at larger radii r >> r(e) of these distant quiescent galaxies. We observe distinct gas absorption properties among different lenses and among sightlines of individual lenses. Specifically, while the quadruple lens for HE 0435-1223 shows no absorption features to very sensitive limits along all four sightlines, strong MgII, Fe II, Mg I, and Ca II absorption transitions are detected along both sightlines near the double lens for HE 0047-1756, and in one of the two sightlines near the double lens for HE 1104-1805. The absorbers are resolved into 8-15 individual components with a line-of-sight velocity spread of Delta v approximate to 300-600 km s(-1). The large ionic column densities, log N greater than or similar to 14, observed in two components suggest that these may be Lyman limit or damped Ly a absorbers with a significant neutral hydrogen fraction. The majority of the absorbing components exhibit a uniform supersolar Fe/Mg ratio with a scatter of < 0.1 dex across the full Delta v range. Given a predominantly old stellar population in these lensing galaxies, we argue that the observed large velocity width and Fe-rich abundance pattern can be explained by SNe Ia enriched gas at radius r similar to r(e). We show that additional spatial constraints in line-of-sight velocity and relative abundance ratios afforded by a multisightline approach provide a powerful tool to resolve the origin of chemically enriched cool gas in massive haloes.
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Russ, William M. "Structure, property, and processing relationships of CMZP - [(Ca0.6,Mg0.4)Zr₄(PO₄)₆]." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/40630.
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Tan, Chee Hing. "Measurements of excess avalanche noise in sub-micron Si and Al[subscript 0.6]Ga[subscript 0.4]As avalanche photodiodes." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392325.
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Maziya, Mphumuzi Thembinkosi. "Investigation and analysis of the causes of 11/0.4 kV distribution transformers' high failure rate : case study - Swaziland Electricity Company." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20403.
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The distribution network of the Swaziland Electricity Company consists of a number of components like distribution lines, wooden poles, insulators, conductors, pole mounted transformers and metering, to mention but a few. The most expensive of these components per unit cost is the pole mounted transformer and it takes longer to install. The distribution network is the less reliable compared to the transmission network, and its components fail regularly, and the pole mounted transformers are among the components which have a significant contribution to the failures. Some interventions in the past have been tried, but the failure rate of transformers has not reduced to reasonable limits, thereby compromising the reliability of the distribution network. This research therefore tries to identify the causes of the high failure rate of transformers, the pattern of failure, areas where the failures are prevalent and what can be done to counter the root causes. Statistical data on the transformer failures was gathered over a period of four years, where on a daily basis, the number of failed transformers, weather conditions and time of day when the failures occurred were recorded. The weather conditions and time of day when the failures occurred made it easier to identify the possible causes of the failures. For instance, if there was a thunderstorm in a certain area and there were some failed units which were discovered immediately after the storm, then the failures of those units was attributed to lightning. Similarly, when there were no thunderstorms, but a transformer has failed windings, the likely cause of failure is overloading. After replacing that failed unit, its load was monitored to confirm overload and then take a corrective action. It is a standard practice that a failed transformer is replaced and the failed one taken for repairs and then later kept as a spare at the Swaziland Electricity Company. Basic tests on the failed transformers and visual inspections were carried out to determine the nature of damage on the failed unit, for instance, winding damage and bushing damage. Footing resistances were also recorded at the transformer structures and if there was a need, they were reduced to 10 Ω or less using the crowfoot earthing method or a combination of the crowfoot earthing method and conductive cement.
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Arredondo, Salmerón Adelina, and Zapien Cuitláhuac Marquez. "“HIDROXIETILALMIDÓN AL 6% 130/0.4 VS SOLUCIÓN HARTMAN EN COCARGA PARA PREVENCIÓN DE HIPOTENSIÓN MATERNA EN CESÁREA BAJO BLOQUEO EPIDURAL”." Tesis de Licenciatura, Medicina-Quimica, 2014. http://ri.uaemex.mx/handle/123456789/14689.
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Secrest, Jeffery A. "Measurement of electroweak asymmetries in vector electron positron scattering at 0.1 less than Q(2) less than 0.4 (GeV/c)(2)." W&M ScholarWorks, 2006. https://scholarworks.wm.edu/etd/1539623493.
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This work is based on the first engineering run of the G 0 experiment from October 2002 though January 2003 in Hall C at Jefferson Lab. The G0 experiment will be the first to measure the weak neutral form factors: GEZ( Q2), GMZ( Q2) and GAe( Q2) and to extract the proton's strange form factors: GEs(Q2) and GMs(Q 2) via a Rosenbluth separation over a range of Q 2 (0.1--1.0 (GeV/c)2). This will require four sets of measurements: forward angle measurements with a proton target, and three sets of backward angle measurements with a hydrogen and deuterium target. The measurements are made of the parity-violating asymmetries in elastic electron scattering.;The G0 experiment is a major installation at Jefferson Lab's Hall C with a new dedicated spectrometer. The superconducting magnet is made up of 8 coils with a maximum field of 1.6 T??m. The scintillator detector array (detector solid angle between 0.4--0.9 sr) detects recoiled protons in the forward angle measurement (where thetap = 70?? +/- 10?? corresponding to scattered electron angles of a few degrees) and to detect scattered electrons in the backward angle measurements. This detector array is made up of a set of 16 pairs of scintillators arranged in 8 sectors around the beam line. Custom electronics handle the high data rate (approximately 1 MHz per detector). The target is a 20 cm long liquid hydrogen cryotarget. Besides the check-out of the new hardware, G 0 has stringent requirements on the performance of the polarized electron beam in order to minimize false asymmetries. Further complicating this fact, in the forward mode, was the requirement that the time structure of the JLab beam had to be changed from 499 MHz to 31 MHz in order to count the recoiled protons in the spectrometer. Data was collected over a 12 day period at the end of the engineering run. These data were analyzed for a Q2 range of 0.1--0.4 (GeV/c) 2 corresponding to measured electroweak asymmetries that ranged from (-4.4 +/- 1.6 +/- 1.6 ppm) to (-8.5 +/- 2.8 +/- 2.5 ppm).
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Yang, Yaping. "Development of SiC whisker/chopped SiC fiber reinforced (Ca0.6,Mg0.4)Zr₄(PO₄)₆ ceramic matrix composites." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/38557.
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SiC whisker reinforced (Ca0.6,Mg0.4)Zr₄(PO₄)₆ (CMZP) matrix composites containing 10, 20, and 30 vol % whiskers were produced using a glass encapsulated hot isostatic pressing (HIPing) technique. The best HIPing temperature, pressure, and time conditions to optimize composite density and strength were determined to be 1050°C, 103 MPa, and 0.25 h.Ph. D.
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Van, Aken Stephen Mark. "Thermal expansion and thermal conductivity of (Ca1-x,Mgx)Zr₄(PO₄)₆ where x = 0.0-0.4." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42159.
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Solid-state reaction and sol-gel processing methods were used to prepare samples of (Ca1 - X,MgX)Zr₄(PO₄)₆(CZP-CMZP) where x = 0.0-0.4. CMZP is a member of the NaZr₂(PO₄)₃ (NZP) class of ceramics and is being investigated for heat engine applications. Linear thermal expansion was determined with a dual push rod dilatometer and axial thermal expansion by high temperature X-ray diffraction and least squares refinement. Thermal diffusivity was determined with the laser flash method and specific heat by differential scanning calorimetry. Thermal conductivity was found by the product of the thermal diffusivity, specific heat, and bulk density of each sample.
Results indicate that CMZP samples exhibit very low α̅L values which become more positive as Mg²⁺ content is increased. Thermal expansion anisotropy (from room temperature to 1000°C) is significantly reduced by the addition of Mg²⁺. Samples where x = 0.4 exhibit the lowest anisotropy with αa being essentially zero (hexagonal system). The thermal conductivity of CMZP samples is very low (0.56 W/m K at 200°C). Thermal conductivity values were observed to decrease with increasing Mg²⁺ content.
The materials structure and cation site selection are discussed in relation to the observed properties.Master of Science
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Caso, Pérez Diana Gisela. "Eficacia del polietilenglicol 400 0.4%)/ polipropilenglicol (0.3%) con hidroxipropil-guar en el tratamiento de la enfermedad de ojo seco leve a moderado." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2014. https://hdl.handle.net/20.500.12672/11911.
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Valora la eficacia del Polietilenglicol 400 (0.4%)/Polipropilenglicol (0.3%) Con Hidroxipropil-Guar en el Ojo Seco leve a moderado en la población de estudio, evaluando los siguientes parámetros Tiempo de Ruptura Lagrimal, Test de OSDI, Escala de Oxford y test de Schirmer. El estudio es prospectivo, experimental, longitudinal que incluye 44 pacientes (88 ojos) a los que luego de evaluar su grado de ojo seco de leve a moderado, se les brinda tratamiento con polietilenglicol 400:4.0mg polienglicol 3.0mg con hidroxipropil Guar a razón de 1 gota cada 6 horas en el caso de ojo seco leve y cada 4 horas en ojo seco moderado. Los parámetros evaluados antes del tratamiento y en cada visita (1 semanal, en total 5) fueron el cuestionario de síntomas (test de OSDI), tiempo de ruptura lagrimal (TRL), test de Schirmer I y tinción corneal con fluoresceína (Escala de Oxford). Se encontró mejoría estadísticamente significativa tras el tratamiento. En la escala de Oxford se encuentra una mejoría en el puntaje final 0.09 ± 0.29 comparado con el inicial 0.33 ± 0.60 (p<0.014). Se observa también una extensión en el test de Schirmer de 8.67 ± 3.56 mm en la visita inicial a 13.65 ± 6.46 mm en la visita final con un p=0.000. Al evaluar el tiempo de ruptura lagrimal se ve una mejoría de 5.40 ± 2.18 segundos en la visita inicial a 8.13 ± 1.17 segundos en la última visita (p=0.000). Finalmente, en el test de OSDI se halla notable mejoría de un puntaje inicial de 39.57 ± 10.02 a 16.51 ± 9.32 como puntaje en la última visita (p=0.000). Se concluye que el polietilenglicol 400 (0.4%)/propilenglicol (0.3%) con hidroxipropil-guar fue eficaz en todos los parámetros evaluados.Trabajo académico
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Hornsby-Myers, Jennifer L. "Use of track-etched polycarbonate filters in series to mimic the total human lung deposition in the ultrafine and fine particle range from 0.03 to 0.40 [mu]m." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1732.
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Thesis (M.S.)--West Virginia University, 2000.Title from document title page. Document formatted into pages; contains ix, 87 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 69-73).
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Ruß, Martin [Verfasser]. "Einfluss von 6% Hydroxyethylstärke 130kDa/0.4 vs. 4% Gelatine auf die Plasmahomöostase unter Azidämie und Hämofiltrations-gestützter Therapie mit THAM-Puffer / Martin Ruß." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2011. http://d-nb.info/1029846200/34.
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Zong, Xiaopeng. "NMR studies of the vanadium spin dynamics and spin structure in LiV₂O₄, CaV₂O₄, and (Li[subscript x]V₁[subscript -x])₃BO₅ (x [almost equal to] 0.33, 0.40)." [Ames, Iowa : Iowa State University], 2007.
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Pal, Y. O., and I. P. Studenyak. "Optical properties of sandwich structure "(Ag[3]AsS[3])[0.6](As[2]S[3])[0.4] thin films - gold nanoparticles" prepared by pulse laser deposition." Thesis, Sumy State University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/64948.
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Among silver-containing chalcogenides Ag-As-S ternary system are take the remarkable place. Glasses and composites of Ag–As–S system are promising materials for creation of solid electrolytes, electrochemical sensors, electrochromic displays etc. In the recent years surface plasmon resonance has been used to enhance photostructural changes due to the laser light. Therefore, it was of a certain interest to obtain and examine such effects in the new investigated Ag-As-S thin films.
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Kwapisz, Krzysztof, and Marcin Gwóźdź. "Influence of ageing process on the microstructure and mechanical properties of aluminium-silicon cast alloys - Al-9%Si-3%Cu and Al-9%Si-0.4%Mg." Thesis, Jönköping University, JTH, Mechanical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1358.
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The aim of this thesis is to investigate the influence of ageing process on the microstructure and mechanical properties of aluminium-silicon alloys. The investigation was carried on Al-9%Si-3%Cu and Al-9%Si-0.4%Mg. To obtain different DAS with low content of oxide films and micro shrinkage, gradient solidification has been used. The specimens were treated according to T6 heat treatment.
In this thesis it has been shown that solidification rate has great influence on mechanical properties since it controls microstructure. To reach peak level of mechanical properties different times of artificial ageing were used depending on the alloy.
In peak value condition Yield’s Strength of alloys was 197MPa for Al-Si-Cu alloy and 243MPa for Al-Si-Mg one. These results can be compared to these presented in other papers concerning aluminium silicon alloys. Such comparison shows that when talking about potential of alloy, these results are more or less the same as in other articles in this field.
The work was conducted within 10 weeks and for this reason not all the necessary data was collected. Further work will be conducted to obtain missing results, like overaged state for Al-Si-Cu alloy.
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Zanetti, Fernando Roberte 1983. "Efeito dos antiinflamatórios tópicos acetato de prednisolona 1%, nepafenaco 0.1% e cetorolaco de trometamina 0.4% na manutenção da midríase intra-operatória em facectomias = estudo clínico aleatorizado." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/311825.
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Orientadores: Rodrigo Pessoa Cavalcanti Lira, Carlos Eduardo Leite ArietaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas
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Resumo: Introdução: Os Antiinflamatórios tópicos são utilizados comumente no tratamento da inflamação ocular e do edema macular cistóide relacionado a cirurgia de catarata. Tem sido sugerido o uso de antiinflamatórios antes da cirurgia, para conseguir uma melhor midriase intraoperatória. Foi relatado que quando midriase e maior do que 6 mm, a incidência de ruptura da cápsula posterior e reduzido pela metade. O objetivo deste estudo original foi comparar o efeito do uso pré-operatório do acetato de prednisolona, do cetorolaco de trometamina, do nepafenaco e de um placebo, na manutenção da midriase intra-operatória da cirurgia de catarata. Objetivo: Comparar o efeito do uso pré-operatório dos antiinflamatórios tópicos acetato de prednisolona 1%, nepafenaco 0.1% e cetorolaco de trometamina 0.4%, alem de um placebo, na manutenção da midriase intraoperatoria durante a cirurgia de catarata. Desenho: Ensaio clinico aleatorizado, mascarado, realizado em um único centro. Métodos: E um estudo composto por 140 pacientes submetidos a cirurgia de facoemulsificação de catarata. Os pacientes (35 voluntários por grupo) foram aleatorizados para receber o placebo (carboximetilcelulose de sódio 0,5%), acetato de prednisolona 1%, cetorolaco de trometamina 0,4% e o nepafenaco 0,1%. Os colírios eram administrados 3 vezes ao dia e iniciados 48 horas antes da cirurgia.. A medida do tamanho da pupila foi realizada pelo cirurgião usando um compasso nos seguintes momentos: antes da secção da córnea e ao final da cirurgia. O desfecho primário foi avaliar a eficácia de cada medicamento em inibir a miose intraoperatoria (pupilas > 6mm, no final da cirurgia). O desfecho secundário foi obter pupilas > 6mm no inicio da cirurgia. Resultados: O numero de pacientes no grupo da prednisolona (29/35), no grupo do nepafenaco (31/35) e no grupo do cetorolaco (30/35) com diâmetro pupilar > 6 mm foi maior do que no grupo placebo em relação a manutenção da midriase intraoperatoria (19/35 - P =. 003). Não houve diferença estatística entre o grupo da prednisolona, do nepafenaco e do cetorolaco na manutenção da midriase intraoperatória (P =. 791). Não houve complicações durante a cirurgia ou efeitos adversos relacionados com o uso pré-operatório do colírio. Conclusão: O uso pré-operatório da prednisolona, do cetorolaco e do nepafenaco foi eficaz na manutenção midriase intraoperatória quando comparado com o placebo
Abstract: Introduction: Topical anti-inflammatory drugs are commonly used in the management of ocular inflammation and cystoid macular edema related to cataract surgery. It has been suggested the use of anti-inflammatory drugs before surgery, to achieve better intraoperative mydriasis. It was reported that, when mydriasis is greater than 6 mm, the incidence of posterior capsule rupture is reduced by half. The objective of the original study was to compare the effect of preoperative use of topical anti-inflammatory prednisolone acetate, ketorolac tromethamine, nepafenac and placebo, in the maintenance of intraoperative mydriasis in cataract surgery. Purpose: To compare the effects of preoperative use of topical anti-inflammatory prednisolone acetate, ketorolac tromethamine, nepafenac and placebo, on the maintenance of intraoperative mydriasis during cataract surgery. Design: Randomized clinical trial, single-center and masked. Methods: This study comprised 140 patients scheduled for cataract surgery. Patients (35 in each group) were randomized to receive placebo, prednisolone acetate, ketorolac tromethamine 0.4 % or nepafenac. These eye drops were administered three times daily for the two days prior to surgery. The pupillary diameters were measured by the surgeon using a compass prior to the corneal section and at the end of surgery. The primary outcome was the number of patients with pupil > 6 mm at the end of the surgery; the secondary outcome was the number of patients with pupil > 6 mm at the beginning of the surgery. Results: All the patients achieved pupil > 6 mm at the beginning of the surgery. The number of patients in the prednisolone (29/35), nepafenac (31/35) and ketorolac (30/35) groups with pupil > 6 mm was greater than in the placebo group in the maintenance of intraoperative mydriasis (19/35 - P =.003 - Table 2). There was no statistical difference among the prednisolone, nepafenac and ketorolac groups in the maintenance of intraoperative mydriasis (P =.791). There were no complications during surgery or related to the preoperative use of the eye drops. Conclusion: Preoperative use of ketorolac, prednisolone and nepafenac was effective in maintaining intraoperative mydriasis when compared with placebo
Mestrado
Oftalmologia
Mestre em Ciências Médicas
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LETOURNEAU, Alain. "Etudes de la réaction de spallation p+Au à 2.5 GeV et de la production neutronique en cibles épaisses (Pb,W et Hg) par des protons de 0.4 à 2.5 GeV." Phd thesis, Université de Caen, 2000. http://tel.archives-ouvertes.fr/tel-00002676.
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Le travail de thèse s'articule autour de deux études : étude de la réaction de spallation p+Au à 2.5 GeV et étude de la production neutronique en cibles épaisses. Ces deux études s'inscrivent dans un programme de recherche initié dans le cadre du projet de Source Européenne de Spallation (ESS) et du projet français de traitement des déchets radioactifs (GEDEON). A l'aide d'un dispositif expérimental très complet alliant un détecteur de neutrons à des détecteurs de particules chargées, tous deux d'efficacité supérieure à 80\%, nous avons pu étudier l'évolution du processus élémentaire de spallation en fonction de l'énergie déposée par le proton incident dans le noyau (énergie d'excitation). Nous avons ainsi montré le réalisme d'une description du processus en deux étapes et validé l'utilisation du code de cascade intra-nucléaire de J. Cugnon (INCL2.0) couplé à un code de désexcitation statistique (GEMINI). Les sections efficaces de production des particules chargées légères ont été mesurées et la contribution de l'émission de prééquilibre évaluée. La formation des particules composites ``directes'' a été ajoutée au code INCL2.0 à l'aide d'un modèle de coalescence. La production neutronique (multiplicités moyennes et distributions) a été étudiée en fonction de l'énergie du faisceau, de la géométrie de la cible et de la nature de la cible. Nous avons montré que le gain en neutrons, lorsque l'épaisseur de cible augmente, est dominé par la probabilité de réaction (pour des épaisseurs de cibles inférieures à 2 ou 3 longueurs d'interaction) et d'une façon moindre par le développement des réactions secondaires. Ces deux paramètres ont été étudiés séparément. Les données expérimentales ont été comparées aux résultats du code de transport HERMES, validant celui-ci pour l'émission de neutrons.
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Francés, González Sonia. "Efecto de la hidratación endovenosa con hidroxietil almidón 6% 130/0.4 (voluven®) versus ringer lactato previa a la analgesia epidural en la incidencia de hipotensión durante el trabajo de parto." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/292373.
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La fluidoterapia endovenosa en las gestantes durante trabajo de parto es
fundamental para la prevención de la hipotensión materna tras la analgesia
epidural y así mantener el bienestar materno-fetal. El tipo de fluidoterapia
administrada, coloides o cristaloides, puede influir en la incidencia de dicha
hipotensión. Presentamos los resultados de un estudio prospectivo
observacional de 188 gestantes en trabajo de parto. El objetivo principal del
estudio fue comparar la incidencia de hipotensión materna tras la
administración de un coloide (6% Hidroxietil almidón 130/0.4, 250 ml) o un
cristaloide (Ringer Lactato, 750 ml) previa a la analgesia epidural. También
evaluamos los requerimientos de drogas vasoactivas, la incidencia de náuseas
y vómitos y la repercusión fetal. La incidencia de hipotensión materna fue
menor en el grupo coloide, con un menor el requerimiento de vasopresores. La
incidencia de náuseas y vómitos fue similar en ambos grupos. En relación a la
repercusión fetal, el APGAR fue similar en ambos grupos, mientras que los
parámetros de pO2 y hemoglobina fueron mayores en el grupo coloide.Intravenous fluid therapy in pregnant women during labor is essential for the prevention of maternal hypotension following epidural analgesia and keeps maternal and fetal well-being. The type of fluid load, colloids or crystalloids, can influence on the incidence of this hypotension. We present the results of a prospective observational study of 188 pregnant women in labor. The main objective of the study was to compare the incidence of maternal hypotension after colloid (6% Hydroxyethyl starch 130/0.4, 250 ml) or crystalloid loading (Ringer Lactate, 750 ml) prior to epidural analgesia. We also evaluated the requirements of vasoactive drugs, the incidence of nausea and vomiting and fetal repercussion. The incidence of maternal hypotension was lower in the colloid group with a lower requirement of vasopressors. The incidence of nausea and vomiting was similar in both groups. In relation to fetal repercussion, the APGAR was similar in both groups, whereas the parameters of pO2 and hemoglobin were higher in the colloid group.
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Dufour-Beauséjour, Sophie. "Effet de la pression sur la renconstruction de la surface de Fermi du cuprate supraconducteur La[indice inférieur 1.6-x]Nd[indice inférieur 0.4]Sr[indice inférieur x]CuO[indice inférieur 4]." Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6718.
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Ce mémoire présente une étude de l’effet d’une pression hydrostatique sur la reconstruction de la surface de Fermi dans le cuprate supraconducteur La[indice inférieur 1.6−x]Nd[indice inférieur 0.4]Sr[indice inférieur x]CuO[indice inférieur 4]. Des mesures de la résistivité et de l’effet Hall ont été effectuées à Sherbrooke ainsi qu’au National High Magnetic Field Laboratory de Tallahassee sur des échantillons de La[indice inférieur 1.6−x]Nd[indice inférieur 0.4]Sr[indice inférieur x]CuO[indice inférieur 4] à deux dopages d’intérêt.
Une revue de la littérature pertinente à la mise en contexte des résultats est d’abord présentée, portant notamment sur les études de pression déjà publiées dans le domaine. Quelques notions théoriques sur le transport électrique et sur les signatures des fluctuations quantiques associées à la présence d’un point critique quantique sont ensuite amenées. La méthode expérimentale est décrite en détail et le fonctionnement des cellules de pression est expliqué. Les résultats obtenus dans le cadre de ces travaux sont ensuite présentés. Finalement, une discussion propose quelques pistes d’interprétation pour ces résultats.
Les mesures d’effet Hall sous pression ont permis de montrer que la reconstruction de la surface de Fermi est supprimée à p = 0.20. Les données de résistivité témoignent d’un déplacement de la ligne T∗ associée au pseudogap et montrent qu’une pression de 20 kbar suffit à révéler un intervalle de dopage où la résistivité est linéaire jusqu’à très basse température.
Ces résultats font état d’une grande ressemblance entre La[indice inférieur 1.6−x]Nd[indice inférieur 0.4]Sr[indice inférieur x]CuO[indice inférieur 4] sous pression et La[indice inférieur 2−x]Sr[indice inférieur x]CuO[indice inférieur 4], le composé parent. Ils appuient de plus la thèse que la pression supprime l’ordre de charge associé à la reconstruction de la surface de Fermi.
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Williams, Lyle. "Mechanisms of inclusion filtration and fluidity using prefil measurement on Al-7Si-0.4 Mg alloy melt report [thesis] submitted in partial fulfilment of the degree of Master of Engineering, Auckland University of Technology, April 2005." Full thesis. Abstract, 2005. http://puka2.aut.ac.nz/ait/theses/WilliamsL.pdf.
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John, Liza. "Comparison of Color and Thiobarbituric Acid (TBA) Values of Cooked Hamburger Patties and Top Sirloin Steaks after Storage of Fresh Beef Chubs and Raw Steaks in Modified Atmospheres of 80% Oxygen or 0.4% Carbon Monoxide." DigitalCommons@USU, 2004. https://digitalcommons.usu.edu/etd/5520.
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This study compared the effect of packaging method (0.4% carbon monoxide, 80% oxygen or vacuum), storage time (7, 14 and 21 days) and internal cooking temperature 49, 57, 66, 71 and 79°C) on color and thiobarbituric acid (TBA) values of top sirloin steaks and ground beef patties. Ground beef was obtained from 3 different sources (chuck, loin and trim). All samples were stored at 2°C for 7, 14 and 21 days.
All raw ground beef samples stored in 0.4% carbon monoxide remained bright red throughout the 21-day storage period. The phenomenon of premature browning (appearance of cooked color at lower than normal cooking temperatures) was observed in samples stored in high oxygen. TBA values were highest for the samples stored in 80% oxygen. Internal a* redness values were lowest for samples stored in 80% oxygen. Percent myogobin denaturation (PMD) increased with increase in internal cooking temperature and was highest for the ground beef samples stored in 80% oxygen.
The a* redness values were highest for raw steaks stored in 0.4% CO. Steaks stored in vacuum had a uniform purple color, but some browning was noticed on the surface of the samples by day 14. PMD and TBA values of cooked top sirloin steaks were highest for the samples stored in 80% oxygen
This study confirms that high oxygen packaging promotes rancidity in ground beef and top sirloin steaks. Packaging in 0.4% carbon monoxide helps maintain a bright cherry red color in ground beef and top sirloin steaks for up to 21 days.
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Beck, Kathrin [Verfasser], and Markus [Akademischer Betreuer] Rehm. "Betrachtungen zur Lebensqualität nach radikaler Zystektomie anhand der Evaluation der (Instrumentellen) Aktivitäten des täglichen Lebens, der postoperativen Nierenfunktion und des Pruritus - ein Vergleich von balancierter 6%iger Hydroxyethylstärke 130/0.4 und 5%igem Humanalbumin / Kathrin Beck ; Betreuer: Markus Rehm." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1201274656/34.
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Wang, Yun-Shiuan, and 王雲玄. "Microemulsion Synthesis Pb(Zr 0.52 Ti 0.48)O3 Nanopowder." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/17361867514451891051.
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Yu, Chih-Chun, and 游智鈞. "A study of phase transformationsin a Fe-21Mn-0.4C alloy." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/97704369831560914904.
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碩士國立臺灣科技大學
機械工程系
95
The alloy steel with a composition of Fe-21.1 wt% Mn-0.37wt% C was studied. Some specimens were heated at several high temperatures from 1300℃ to 1050℃, followed by quenching into water or air-cooling. Lots of precipitates with a wicker shape distributed uniformly in the FCC grains. In TEM study, we found the precipitates which could only be observed in some special angle had some characteristics of martensite phase. Therefore, the precipitates are coherent with the FCC matrix. For specimens heated at 1100℃ for solution heat treatment and aged at following low temperatures from 800℃ to 500℃, the phases existed in the specimens were similar to those specimens heated at temperatures from 1300℃ to 1050℃ and quenched into cold water or air-cooled. For specimens heated at 1100℃ and followed by furnace cooling, or aging at temperatures from 1000℃ to 900℃, we found ε martensite phase appeared in the FCC matrix of the alloy in addition to the wicker form precipitates.
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Lin, Yi-chieh, and 林義傑. "The Phase Transformations of the Fe-8Al-15Mn-1Si-0.4C Alloy." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/02992494445626453977.
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碩士國立屏東科技大學
機械工程系所
96
The main purposes of the present studies are to investigate the phase transformations of the Fe-8Al-15Mn-1Si-0.4C alloy by using optical microscopy (OM) and transmission electron microscopy (TEM). The microstructure of the alloy after being solution heat-treated at 1100℃ for 30 min and then quenched. It reveals a (γ+α) phase microstructure. The austenite matrix was single-phase and the ferrite matrix were (α+B2+DO3) phases microstructure, where the (α+B2+DO3) were formed by a continuous ordering transition during quenching. When the as-quenched specimen aged at the temperature from the 200℃~650℃ for longer times, no evidence of the (Fe,Mn)3AlCx carbides formed on the austenite matrix could be detected. Moreover, the needle-like precipitates has L12-type structure occurred as well as the DO3 precipitates grew along <100> directions on the ferrite matrix on the α matrix. When the aging temperature was increased to 750℃ for shorter times, a needle-like L12-type precipitates occurred on the twin boundary of austenite matrix. With increasing the aging temperatures from 200℃ to 750℃, the phase transformation sequence occurring within the α matrix is found to be (α+DO3+B2+needle-like L12-phase)→(α+ spherical DO3+ needle-like L12- phase)→(α+ quadrate DO3+ needle-like L12-phase) →(α+ B2). Furthermore, during aging, the ferrite grains grew along <100> directions to the austenite matrix on the γ/α grain boundary.
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LIN, HUI-JUAN, and 林惠娟. "The liquid-phase-epitaxy grown In 0.53 Ga 0.47 As/Inp semiconductor laser." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/48267042487171817861.
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Cheng, Wei-Hua, and 鄭惟華. "The Implementation of 0.4~0.9GHZ RF Receiver for LPWAN Application." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/z7ekxm.
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碩士元智大學
通訊工程學系
106
The research presents in this study is intended for application in LPWAN (LoRa).The research contains low power low noise amplifier with Active Inductor and down-conversion Mixer Designs. All of them were simulated and fabricated by using TSMC0.18um CMOS process. The low noise amplifier uses resistor feedback to bias and operates in subthreshold region to save power. Active inductor is used for output matching. The down-conversion mixer applies bulk injection in order to achieve low power consumption. Take cost into consideration, active balun is employed instead of passive one, and its transistors operate in subthreshold region as well. The circuit design consideration of this research is based on inductorless, and low noise figure, low power dissipation’. The circuit presented in the research were all taped out through the TSMC and verified the proposed idea work by on wafer measurement.
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Chan, Yun-Sheng, and 詹耘昇. "0.4V Configurable Near-Threshold TCAM Design in 28nm High-k Metal-Gate CMOS Process." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/xt3595.
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碩士國立交通大學
電子工程學系 電子研究所
104
Even though ternary content addressable (TCAM) is the power hungry circuitry, it still be extensively adopted in routing table of network systems by its high speed and unique. With the develop of the portable devices and the rise of Internet of Things (IoT), the issue of energy efficiency and low supply voltage become a major trend in SoC. If we want to introduce TCAM into IoT. Its power hungry problem should be solved first. However, conventional 6T SRAM is hard to work in low supply voltage duo to read/write ability degradation which caused by severely process variation in advance process. We realize our design in umc 28nm high-k metal-gate (HKMG) CMOS technology. We introduce the 6T Mini-array into TCAM and let it can even operate at 0.4V. Additionally, we use hierarchical PRE, power gating and ripple search-line in our design which let total energy consumption less.
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Ouchni, Fatiha [Verfasser]. "Exact diagonalization studies of a one-dimensional system at electron density ρ=0.4 [rho=0.4] : effect of the Coulomb repulsions and distant transfer / von Fatiha Ouchni." 2006. http://d-nb.info/981374425/34.
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許臻豪. "Hydrogen Storage in CoFeMnTiVxZry (0.4 ≤ x, y ≤ 3) High-Entropy Alloys." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/35885955614780794646.
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碩士國立清華大學
材料科學工程學系
96
Storage capacity, working pressure and temperature, cycle life, and rate of absorption and desorption in hydrogen storage are current emphasized developing issues. We use a vacuum arc remelter to prepare as-cast alloys. The alloys are characterized by scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), and x-ray diffractometry (XRD). Pressure-composition-isotherm (PCI) curves are used to investigate the absorption and desorption of hydrogen. After detailed investigation we conclude that both equal- and non-equal-molar high-entropy alloys have a high potentiality in hydrogen storage. Results on Laves phase-related CoFeMnTiVxZry (0.4 ≦ x, y ≦ 3) high-entropy alloys shows that with Zr as a component, high-entropy alloys are easily activated and absorb hydrogen. Simultaneous addition of Zr and V improves the capacity of hydrogen absorption. In this experiment, we first adopt the most popularly used equal-molar compositions in high-entropy alloys as a base to find a suitable alloy series, then change the relative amount among components in alloys or make substitution for elements to investigate in detail the effects of elements and non-equal molar compositions on the hydrogen storage properties. An equipartition method (EPM) for calculation formation enthalpy of multicomponent metal hydrides proposed in this study shows a linear relationship between enthalpy per mole atom in alloy and maximum storage capacity in atomic ratio for a single system. On the other hand, for different systems total energy determines the maximum storage capacity among systems.
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Syu, Sheng Jye, and 徐聖傑. "Coexistence of ferromagnetic and antiferromagnetic phase transitions in CeCu1-xMnxGe (0.1 ≤ x ≤ 0.4)." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/56670131581287665346.
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Liu, Yen-Nan, and 劉彥男. "Dielectric Response of Ba2SmNbxMo1-XO6 (X=1, 0.9, 0.5, 0.4, 0.3, 0.2, 0.1)." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/83958974469286200129.
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碩士國立臺灣大學
物理研究所
101
The synthesis, characterization and dielectric properties of the polycrystalline rare earth oxides Ba2SmNbXMo1-XO6 compounds were investigated. Powder X-ray diffraction patterns show that all these samples are single phase without any impurity. The dielectric properties of these compounds were studied in the frequency range from 20 Hz to 1 MHz between 20 K and 320 K. The Ba2SmNbXMo1-XO6 samples exhibit a high dielectric permittivity (ε’~104）at room temperature with frequency dispersion. The corresponding tanδ(T) curves exhibit two relaxations. The peak temperature TP of tanδ shifts to a higher temperature as the frequency increases in both relaxations, indicating thermally activated relaxation. The overall behavior of high temperature ε’ and tanδ is similar to that observed in giant dielectric constant materials. The observed giant dielectric response was explained in terms of internal (grain boundary) barrier layer capacitance (IBLC) effect. Complex modulus analysis was used to distinguish the grain and grain boundary resistance in all compositions. The observed results may provide a better understanding of the dielectric properties of the Ba2SmNbXMo1-XO6 system, and might be extended to advanced applications.
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Jan, Chi-hung, and 詹啟宏. "Magnetic properties and Capacity of Shape Memory Alloys Ni2+xMn1-xGa (x = 0~0.4)." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/90475425843129335230.
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