Bibliografías temáticas / Natural sciences - Physics / Tesis
Siga este enlace para ver otros tipos de publicaciones sobre el tema: Natural sciences - Physics.

Tesis sobre el tema "Natural sciences - Physics"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 1 de febrero de 2022

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros

Elija tipo de fuente:

Consulte los 50 mejores tesis para su investigación sobre el tema "Natural sciences - Physics".

Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.

También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.

Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.

1

Helfgott, Michel y Darrell Moore. "Introductory Calculus for the Natural Sciences". Digital Commons @ East Tennessee State University, 2013. http://amzn.com/1453880836.

Texto completo
Resumen
This textbook is intended for first-year college students in biology, chemistry, or physics. Its most distinctive feature is the central role played by applications to the natural sciences. Considering that nowadays students have access to graphing calculators that can solve complicated integrals, little or no space has been devoted in the book to integrals that require subtle changes of variables. Rather, we choose to concentrate on the basic techniques of integration and stress the solution of applied problems, especially those that use real data. We envision a calculus course where students not only learn to calculate derivatives or solve integrals, but are also able to discuss the validity of a model and estimate parameters.
https://dc.etsu.edu/etsu_books/1059/thumbnail.jpg
Los estilos APA, Harvard, Vancouver, ISO, etc.
2

Liu, Zhiyuan. "A Study of Stochastic Processes in Natural and Social Sciences". University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin153027399786377.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
3

Lindh, Max. "An Introduction to the McKay Correspondence : Master Thesis in Physics". Thesis, Uppsala universitet, Högenergifysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-342308.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
4

Prytz, Christopher. "A Qualitative Analysis of Students' Free Exploration of a Physics Simulation Software". Thesis, Uppsala universitet, Fysikundervisningens didaktik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385668.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
5

Fernandez-Martinez, Alejandro. "Physics of natural nanoparticles - water interfaces: chemical reactivity and environmental implications". Phd thesis, Université de Grenoble, 2009. http://tel.archives-ouvertes.fr/tel-00771937.

Texto completo
Resumen
Les eaux et les plantes des zones volcaniques sont souvent très pauvres en sélénium, alors que les teneurs totales observées dans les sols sont normales. Ceci est très spécifique aux zones volcaniques et semble dû aux argiles des sols qui ne sont pas des phylloaluminosilicates comme dans la plupart des autres régions du globe, mais des aluminosilicates tubulaires, les imogolites. Ces minéraux sont dotés d'une très grande surface spécifique (400-1000 m2 g-1 selon la méthode) et réagissent avec les anions de sélénium en formant des complexes de sphère interne, liées par des liaisons covalentes, qui réduisent la mobilité du sélénium en affectant sa biodisponibilité. D'un autre cote, l'interaction de la surface externe de ces nanotubes d'imogolite, similaire a la surface (001) de la gibbsite, avec l'eau a été étudié par des simulations de dynamique moléculaire. Les simulations décrivent une surface plus hydrophobique que celle de la gibbsite, étant l'hydrophobicite induite par la courbure de la structure. Ce résultat a des importantes implications environnementales, car il peut expliquer la formation de complexes organo-minerales entre les aluminosilicates nanotubulaires ou nanoparticulés. Comme dernier résultat, une structure pour la schwertmannite, un oxyhydroxy-sulphate de fer nanoparticulé, a été décrite a partir de données de diffraction de rayons X de haute énergie et des simulations ab-initio.
Los estilos APA, Harvard, Vancouver, ISO, etc.
6

Rydbeck, Sara. "Phenomenological Studies in Cosmoparticle Physics : Expansion Histories in non-Einstein Gravity and Dark Matter at the Large Hadron Collider". Doctoral thesis, Stockholms universitet, Fysikum, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-56952.

Texto completo
Resumen
As the Big Bang model has become established, the fields of cosmology and particle physics have become intertwined. A range of observations forces us to consider the phenomena of dark matter and dark energy. This interpretation is based on our understanding of gravity, while the standard model of particle physics describes the other fundamental forces in nature and fails to explain the dark components. This thesis includes two different types of studies where hypotheses of physics beyond the standard models of particle physics and cosmology are faced with what observations and experiments can tell us. The first one deals with the possibility that our theory of gravity is what has to be modified at large distances to explain the dark energy, which then need not be a contribution to the energy content at all. The expansion histories in two such frameworks are tested with data from type Ia supernovae and measurements of the baryon acoustic peak in the galaxy distribution as well as in the cosmic microwave background. The second type of study concerns the possibility of establishing the particle nature of dark matter through interactions other than gravitational. While there are ways of doing this using astrophysical observations, the uncertainties due to astrophysics and the unknown distribution of the dark matter are large. High energy particle colliders provide a way of imitating the conditions of the early universe in the laboratory, where we can hope to produce yet unknown heavy particle states and in a more controlled environment determine their properties. We study the prospects for discovering two types of weakly interacting dark matter candidates at the CERN Large Hadron Collider.
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.
Los estilos APA, Harvard, Vancouver, ISO, etc.
7

Stantchev, Rayko Ivanov. "Non-invasive near-field THz imaging using a single pixel detector". Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/27766.

Texto completo
Resumen
The terehertz radiation potentially has many interesting applications. From air port security, non-destructive evaluations of electronics and space shuttle panels, to non-ionizing photon energies with the potential to detect cancer growths and quality control of pharmaceutical tables, the list of potential applications is vast as shown in chapter 1. However, there is a lack of cheap, robust and efficient THz sources, detectors and modulators. Further, the long wavelengths render micron sized details unseeable with far-field imaging techniques. This has rendered most imaging applications unusable in the real world. This thesis is based around demonstrating an imaging technique that uses a near-field THz modulator to obtain sub-wavelength images. There are five distinct experimental demonstrations that show the full capacity of the imaging technique developed here. Chapter 2 gives an outline of the background physics knowledge needed to understand the entirety of the thesis. An outline of the mathematics used for modellingis given in the latter part of the chapter as well. Chapter 3 gives a background on the THz generation and detection techniques used in our THz-TDS system, optical rectification and electro-optic sampling in ZnTe. Further more, our system is capable of photoexciting a sample in conjunction to it being probed with a THz pulse. For the most part, we photoexcite a silicon wafer in order to use its photoconductive properties to modulate our THz pulse. Our photoexcitation pulse is spatially modulated, via a digital micromirror device, which in turn spatially modulates our THz pulse. This patterned THz pulse can then be used with a single-element detector to perform imaging. How to do this and the type of patterns needed is described in the latter part of chapter 3. Chapter 4 is the first demonstration that photo-induced conductivity in silicon can be used to manipulate evanescent THz fields for sub-wavelength imaging. For this, we imaged a 1D sub-wavelength slit and were able to obtain the slit profile with 65μm (λ/6 at 0.75T Hz) resolution. Chapter 5 demonstrates what limits the resolution in our imaging system. Namely, the distance which the patterned THz pulse propagates to the object from where itwas spatially modulated. We demonstrate 9μm (λ/45 at 0.75T Hz) resolution using an ultra-thin (6μm) silicon wafer. At such sub-wavelength scales polarization becomes an important factor. We show how one can use polarization in order to detect 8μm breaks in a circuit board hidden by 115μm of silicon. Chapter 6 concerns itself with showing how noise affects our images. Further more, our imaging system is compatible with compressed sensing where one can obtain an image using fewer measurements than the number of pixels. We investigate how different under-sampling techniques perform in our system. Note under-sampling at sub-wavelength resolutions, as is done here, is rather unusual and is of yet to be demonstrated for other part of the electro-magnetic spectrum. Chapter 7 shows that one does not need to photoexcite silicon. One can in principle illuminate any material, hence we photoexcite graphene with our spatially modulated optical pulses. This allows us to obtain the THz photoconductive response of our graphene sample with sub-wavelength resolution (75μm ≈ λ/5 at 0.75T Hz). We compare our results with Raman spectra maps. We find a clear correlation between THz photoconductivity and carrier concentration (extracted from Raman). Chapter 8 exploits the full capacity of our imaging system by performing hyper-spectral near-field THz imaging on a biological sample. For this, in our imaged field of view, we measured the full temporal trace of our THz pulse at a sub-wavelength spatial resolution. This has allowed us to extract the frequency dependent permittivity of our biological sample, articular cartilage, over our spectral range (0.2-2T Hz). We find the permittivity to change on a sub-wavelength scale in correlation with changes in the structure of our sample. However, the permittivity extraction procedures that have been developed make a far-field approximation. We mathematically show the presence of the THz near-fields to render the long wavelength spectral parts of our extracted permittivity to be wrong. Chapter 9 is where we conclude and point out the main problem that needs to be addressed in order to make the measurements presented here more accessible to others. Namely, the cost of the laser system powering the THz-TDS and how to further reduce the acquisition time.
Los estilos APA, Harvard, Vancouver, ISO, etc.
8

Lam, Quang Vinh. "Applying problem-solving approaches in a general physics laboratory in the College of Natural Sciences, Ho Chi Minh City, Vietnam". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0026/MQ51384.pdf.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
9

Vestberg, Robert. "Dendron decorated chromophores for optical power limiting applications". Doctoral thesis, Stockholm, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-78.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
10

Ma, Tao. "Statistics of Quantum Energy Levels of Integrable Systems and a Stochastic Network Model with Applications to Natural and Social Sciences". University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1378196433.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
11

Pasuwan, Patrawan. "Measurements of luminosity and a search for dark matter in the ATLAS experiment". Licentiate thesis, Stockholms universitet, Fysikum, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-193096.

Texto completo
Resumen
This licentiate thesis presents contributions to the luminosity measurement from the data recorded by the ATLAS detector in 2017 using a track-counting technique, as well as a search for dark matter in the ATLAS experiment using 139 fb-1 of √s = 13 TeV pp collision data delivered by the LHC from 2015 to 2018. Track-counting luminosity measurements in low-luminosity operations are performed to study the effect of low collision rates on luminosity determination. The luminosity measured in a calibration transfer procedure using the track-counting technique is used to correct the pile-up dependence observed in ATLAS’s main luminosity detector called LUCID. A search in the final state of a lepton, jets and missing transverse energy, where the final state is produced from a pair of top quarks and a spin-0 scalar/pseudoscalar mediator, is presented. A dedicated signal region is designed to target this final state in which the mediator decays into dark matter particles. The signal region covers the search in the mass plane of the mediator and the dark matter particle. Dedicated control regions are designed to estimate the top-quark background events, as well as the events where a Zboson is produced in association with the top quarks. The signal region event counts in the data have not been unblinded yet, but expected exclusion limits at 95% confidence level as a function of mediator mass are presented. Scalar and pseudoscalar mediators are expected to be excluded up to 200 and 250 GeV, respectively, for the dark matter mass of 1 GeV, and the coupling strengths of the mediator to the dark matter and Standard Model particles of 1.
Los estilos APA, Harvard, Vancouver, ISO, etc.
12

Rydén, Gabriel. "Ab initio lattice dynamics and Anharmonic effects in refractory Rock-salt structure TaN ceramic". Thesis, Linköpings universitet, Teoretisk Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-174208.

Texto completo
Resumen
Transition Metal Nitrides (TMN) are of considerable importance for the industry and have gathered a great deal of interest in the scientific community, mostly due to their unique physical and mechanical properties. To increase the understanding of what enables them to have such extraordinary properties requires the study of lattice dynamics and their phonon dispersion. In this thesis, the transition metal nitride, TaN, is studied extensively along with preliminary results for NbN. The primary tool for this investigation is simulations. Computational methods, such as ab initio Molecular Dynamics (AIMD) and the Temperature Dependent Effective Potential (TDEP) method are used to generate phonon spectra and to compute the lattice thermal conductivity. The results indicate that TaN crystal structure stabilizes dynamically at much lower temperatures than previously established with other methods. The average linear thermal expansion coefficient of TaN is a = 9.0 * 10-6 K-1, which is consistent with other TMN. The phonon-phonon lattice thermal conductivity of TaN follows a similar behaviour as for other TMN. Preliminary result for NbN suggests a behaviour at lower temperatures that are similar to that observed for TaN. However, further investigations are required to pinpoint TaN and NbN transition temperatures more exactly and include effects, such as electron-phonon scattering and isotope effects for a better estimation of the lattice thermal conductivity.
Los estilos APA, Harvard, Vancouver, ISO, etc.
13

Zhang, Hengfang. "Hot-wall MOCVD of N-polar group-III nitride materials". Licentiate thesis, Linköpings universitet, Halvledarmaterial, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-175502.

Texto completo
Resumen
Group III-Nitride semiconductors: indium nitride (InN), gallium nitride (GaN), aluminum nitride (AlN) and their alloys continue to attract significant scientific interest due to their unique properties and diverse applications in photonic and electronic applications. Group-III nitrides have direct bandgaps which cover the entire spectral range from the infrared (InN) to the ultraviolet (GaN) and to the deep ultraviolet (AlN). This makes III-nitride materials suitable for high-efficient and energy-saving optoelectronic devices, such as light-emitting diodes (LEDs) and laser diodes (LDs). The Nobel Prize in Physics 2014 was awarded for the invention of efficient GaN blue LEDs, which further accelerated the research in the field of group III-nitride materials. GaN and related alloys are also suitable for high-temperature, high-power and high-frequency electronic devices with performance that cannot be delivered by other semiconductor technologies such as silicon (Si) and gallium arsenide (GaAs). For example, GaN-based high electron mobility transistors (HEMTs) have been widely adopted for radio frequency (RF) communication and power amplifiers, high-voltage power switches in radars, satellites, and wireless base stations for 5G.  Recently, nitrogen (N)-polar group-III nitrides have drawn much attention due to their advantages over their metal-polar counterparts in e.g. HEMTs. These include feasibility to fabricate ohmic contacts with low resistance, an enhanced carrier confinement with a natural back barrier, and improved device scalability. Despite intensive research, the growth of micrometer-thick high-quality N-polar GaN based materials remains challenging. One of the major problems to develop device-quality N-polar nitrides is the high surface roughness, which results from the formation of hexagonal hillocks or step-bunching. Another significant hurdle is the unintentional polarity inversion, which reduces the crystalline quality and prohibits device fabrication.  This licentiate thesis focuses on the development of N-polar AlN and GaN heterostructures on SiC substrates for HEMT RF applications. The overall aim is to exploit the advantages of the hot-wall MOCVD concept to grow high-quality N-polar HEMT structures for higher operational frequencies and improved device performance. In order to achieve this goal, special effort is dedicated to understanding the effects of growth conditions and substrate orientation on the structural properties and polarity of AlN, GaN and AlGaN grown by hot-wall MOCVD. N-polar AlN nucleation layers (NLs) with layer by layer growth mode and step-flow growth mode can be achieved on on-axis and 4_ offaxis SiC (000¯1), respectively, by carefully controlling V/III ratio and growth temperature. Utilizing scanning transmission electron microscopy (STEM) we have established a comprehensive picture of the atomic arrangements, local polarity and polarity evolution in AlN, GaN/AlN and AlGaN/GaN/AlN in the cases of low-temperature and high-temperature AlN NLs both for on-axis and off-axis substrates. We have shown that typically employed methods for polarity determination using potassium hydroxide wet etching could not provide conclusive results in the case of mixed-polar AlN as Al-polar domains may be easily over-etched and remain undetected. Atomic scale electron microscopy is therefore needed to accurately determine the polarity. We further have developed growth strategy and have optimized the epitaxial process for N-polar GaN, and have demonstrated high quality N-polar AlGaN/GaN/AlN heterostructures.

Additional funding agencies: Chalmers University of technology; ABB; Ericsson; Epiluvac; FMV; Gotmic; Saab; SweGaN; UMS; Swedish Foundation for Strategic Research under Grants No. FL12-0181, No. RIF14-055, and No. EM16-0024; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University, Faculty Grant SFO Mat LiU No.2009- 00971.

Los estilos APA, Harvard, Vancouver, ISO, etc.
14

Dieval, Catherine. "Solar wind ions inside the induced magnetosphere of Mars". Doctoral thesis, Luleå tekniska universitet, Rymdteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17120.

Texto completo
Resumen
The subject of the thesis is analysis and modeling of the entry, transport, and atmospheric precipitation of solar wind ions, H+ and He2+, into the induced magnetosphere of Mars. The solar wind is a flow of charged particles emitted by the Sun. The solar wind carries with it a magnetic field, the interplanetary magnetic field (IMF). The IMF piles up on the dayside of the non-magnetized Mars and is then convected towards the nightside. The solar wind ions can normally not cross the magnetic barrier, formed by the pile up IMF. However, in situ observations by the Mars Express spacecraft reveal that downward moving solar wind H+ and He2+ are sometimes present in the Martian ionosphere, below the magnetic barrier. The gyroradii of shocked solar wind ions may be comparable to the size of the dayside Martian magnetic barrier and for certain circumstances, these ions can gyrate through. Observations by Mars Express are used to analyze H+ and He2+ penetrating through the magnetic barrier and precipitating into the Martian ionosphere, identified by the presence of ionospheric photo-electrons. A case study shows evidence of narrower energy distributions for H+ (with energy ≥ solar wind energy), as the spacecraft moves down in altitude. From this, the study concludes that the magnetic barrier prevents the lower energy H+, from reaching low altitudes. The thesis also describes a statistical study of precipitating H+ fluxes, which indicate that H+ precipitation is rare (detected during 3% of the dayside observation time only) and carries on average 0.2% of the upstream solar wind particle flux. In another statistical study, the thesis shows that the precipitation of H+ and He2+ decreases even further when Mars encounters solar wind pressure pulses. A possible explanation is that the enhanced mass loading of the magnetic field flux tubes by planetary heavy ions, while the tubes drag through the ionosphere at lower altitudes, slows down their velocity and allows more magnetic flux to pile up. The magnetic barrier becomes a more effective obstacle to the solar wind ion precipitation. Furthermore, the thesis describes a model of H+ precipitation onto the Martian upper atmosphere using a hybrid code of the Mars solar wind interaction. The spatial patterns of the precipitation depend on the H+ energy, on the H+ origin (solar wind or generated from the hydrogen corona) and on the altitude. Some features of the observed H+ distributions are reproduced by simulations, while others are not, indicating a more complex physics than in the model. The thesis also describes amodel study of transport of H+, fast H atoms and He2+ through the atmosphere using a Direct Simulation Monte Carlo model. This study demonstrates the crucial role of the magnetic field in determining the energy deposition of the solar wind ions in the topside atmosphere. For instance, a horizontal magnetic field with strength of 50 nT backscattered almost all H+, thus preventing these particles to deposit their energy at lower altitudes. The conclusion of the thesis work is that although some solar wind ions do precipitate, the magnetic barrier effectively protects the onospherefrom precipitating solar wind ions.
Ämnet för avhandlingen är analys och modellering av inflödet av solvindsjoner, H+ och He2+, genom Mars inducerade magnetosfär. Solvinden är ett flöde av laddade partiklar från Solen. Solvinden bär med sig ett magnetfält, det så kallade interplanetära magnetfältet (IMF). IMF packas ihop framför dagsidan av planeten innan det tar sig vidare mot nattsidan. Solvindsjoner kan vanligtvis inte passera denna magnetiska barriär som skapas då IMF packas ihop. Dock avslöjar in situ-observationer av rymdsonden Mars Express att nedåtflödande H+ och He2+ från solvinden ibland påträffas inuti Mars jonosfär, nedanför den magnetiska barriären. Gyroradierna hos solvindsjoner i shockregionen kan vara jämförbara med storleken av den magnetiska barriären over Mars dagsida och i vissa fall kan jonerna gyrera igenom barriären. Observationer från Mars Express används för att analysera H+ och He2+ som tar sig igenom den magnetiska barriären och ner i Mars jonosfär, vilken identifieras genom närvaron av jonosfäriska fotoelektroner. En fallstudie visar tecken på smalare energifördelningar av H+ (med energi ≥ solvindens energi), ju lägre rymdsonden tog sig. Från detta slutleder studien att den magnetiska barriären reflekterar H+ med lägre energi och förhindrar dem från att nå lägre altituder. Avhandlingen beskiver även en statistisk studie av inflödande H+, vilken indikerar att inflödet av H+ är sällsynt (observeras enbart under 3% av observationstiden över dagsidan) och bär i genomsnitt med sig 0.2% av partikelflödet som finns uppströms i solvinden. I en annan statistisk studie visar avhandlingen att inflödet av solvindsjonerna H+ och He2+ minskar ytterligare när Mars möter tryckpulser i solvinden. En möjlig förklaring är att den ökade masslastningen av magnetfältets av tunga planetära joner, då magnetfältet släpas genom jonosfären på lägre höjd, bromsar upp magnetfältet och orsakar ytterligare hoppackning av magnetfältet. Det gör den magnetiska barriären till ett mer effektivt hinder för inflödet av solvindsjoner. Vidare beskriver avhandlingen en modell för inflöde av H+ till Mars övre atmosfär genom att använda en hybridkod för Mars växelverkan med solvinden. Mönster i utbredningen av inflödet beror på energin hos H+, på källan till H+ (solvinden eller skapad från vätekoronan), och på altituden. Vissa egenskaper hos H+-fördelningarna återskapas av simuleringar, medan andra inte gör det, vilket tyder på en mer komplicerad fysik än i modellen. Avhandlingen beskriver också en modellstudie av transport av H+ , snabba H atomer, och He2+ genom atmosfären med en Direct Simulation Monte Carlo modell. Denna studie demonstrerar den avgörande roll som magnetfältet har i att bestämma energin som solvindsjoner avlämnar i den övre atmosfären. Till exempel reflekterade ett horisontellt magnetfält på 50 nT nästan allt H+, och förhindrade dessa partiklar från att avlämna sin energi på lägre altituder. Slutsatsen av avhandlingen är att även om vissa solvindsjoner tar sig igenom, så är den magnetiska barriären ett effektivt skydd av jonosfären mot infallande solvindsjoner.

Godkänd; 2012; 20121009 (catdiv); DISPUTATION Ämne: Rymdteknik/Space Technology Opponent: PhD Christian Mazelle, Institut de Recherche en Astrophysique et Planétologie, Toulouse, France Ordförande: Professor Stas Barabash, Svenska institutet för rymdfysik, Kiruna Tid: Fredag den 14 december 2012, kl 10.00 Plats: Aula, Svenska institutet för rymdfysik, Kiruna

Los estilos APA, Harvard, Vancouver, ISO, etc.
15

Klostermann, Ulrich. "Submicrometer sized magnetic tunnel junctions : dissertation submitted in the requirement for the degree of doctor natural sciences in physics in the graduate division of the university of Regensburg, 2001 /". Berlin : Logos-verl, 2002. http://catalogue.bnf.fr/ark:/12148/cb39077330h.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
16

Lababidi, Ahmad Montaser. "Measuring Stress in Thin Films by a Multi-beam Optical Sensor (MOS)". Thesis, Uppsala universitet, Materialfysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-439565.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
17

Gustafsson, Mikael y Rikard Ask. "Betydelsen av utomhuspedagogik för elevers lärande inom naturvetenskap". Thesis, Malmö universitet, Fakulteten för lärande och samhälle (LS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-28798.

Texto completo
Resumen
AbstractOutdoor education is a concept of the idea where you teach matters. This study asks the question of what significance outdoor education has for learning in natural science and how motivation influence the learning of the students.For young students in natural science it is important that they have the possibility to vary their environmental setting to be able to get firsthand and authentic experiences of life, nature, society and culture in its natural place, so that they can use that in their early education. A variety of how the students learn should mix between literal- and sense-based learning. Several of the studies that we have researched shows the same thing, outdoor education has an impact on the knowledge and skillset within natural science for the students. Yet it is rarely used to the extent that maybe it should within education. It does however not stop there; outside education also motivates students to learn both in the outside and inside settings.
Los estilos APA, Harvard, Vancouver, ISO, etc.
18

Enghag, Margareta. "Two dimensions of Student Ownership of Learning during Small-Group Work with Miniprojects and Context Rich Problems in Physics". Doctoral thesis, Västerås : Department of Mathematics and Physics, Mälardalen University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-169.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
19

Spode, Lennart. "Mapping the binding energy of H inside amorphous and crystalline transition metals using the effective medium theory". Thesis, Uppsala universitet, Materialfysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-413982.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
20

Guerrero, Salgado Eduardo. "SÍNTESIS, CARACTERIZACIÓN Y ANÁLISIS DE LA RESPUESTA TERMOLUMINISCENTE DE HIDROXIAPATITA OBTENIDA A PARTIR DE HUESO DE PESCADO Y DOPADA CON Nd2O3". Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2021. http://hdl.handle.net/20.500.11799/110648.

Texto completo
Resumen
El estudio y búsqueda de nuevos materiales termoluminiscentes que permitan sensar radiación ionizante es un área muy activa en física de radiaciones, por lo que, la motivación del presente trabajo de tesis consiste en el procesamiento y caracterización de muestras de hidroxiapatita puras y dopadas con óxido de neodimio (Nd2O3) sometidas a diferentes dosis de irradiación gamma para aplicación como dosímetros termoluminiscentes pasivos (DTL).
El estudio y búsqueda de nuevos materiales termoluminiscentes que permitan sensar radiación ionizante es un área muy activa en física de radiaciones, por lo que, la motivación del presente trabajo de tesis consiste en el procesamiento y caracterización de muestras de hidroxiapatita puras y dopadas con óxido de neodimio (Nd2O3) sometidas a diferentes dosis de irradiación gamma para aplicación como dosímetros termoluminiscentes pasivos (DTL).
Trabajo soportado por el Instituto Nacional de Investigaciones Nucleares
Los estilos APA, Harvard, Vancouver, ISO, etc.
21

Filippov, Andrei. "Self-Diffusion and Microstructure of Some Ionic Liquids in Bulk and in Confinement". Doctoral thesis, Luleå tekniska universitet, Kemiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18055.

Texto completo
Resumen
An ionic liquid (IL) is a salt, which usually is in the liquid state at normal temperature and pressure. The properties of ILs can be adjusted for various processes and applications by choosing different combinations of ions. Similar to other salts, ILs contain only ions with positive (cations) and negative (anions) charges in equal proportions. However, to prevent solidification, ions in ionic liquids usually contain bulky organic chemical groups, which, apart from electrostatic interactions, promote other types of interactions between ions, such as: (i) van-der-Waals interactions; (ii) hydrogen bonding; (iii) - stacking, etc., depending on the particular chemical structure of the ions. All these interactions, in combination, may lead to formation of specific microstructures in ILs, which may vary with temperature caused by changing thermal rotational and translational energies of the ions. Ions in these microstructures may have preferential orientations relative to each other, maintain anisotropic properties similar to those in liquid crystals or, in some specific cases, may even separate into microscopically organised liquid phases. Therefore, the dynamics of ILs may also be dependent on their microstructure. In many practical applications ionic liquids are placed on surfaces or in confinements. Solid surfaces introduce extra forces, which may be specific to the charge of the ions or/and to functional groups in the ILs. The geometry and interactions of ions in confinements or/and pores of materials may also disrupt specific bulk microstructures of ILs. Both confinement effects and interactions of ions with surfaces are manifested in the translational dynamics of the ions. One of the most direct and informative methods to study translational dynamics of ILs is pulse-field-gradient nuclear magnetic resonance (PFG-NMR).In this thesis the results of PFG-NMR studies on a few classes of ILs are reported: (i) the historically “standard” (since Walden’s discovery in 1914) ionic liquid, the ethylammonium nitrate (EAN) and (ii) halogen-free orthoborate-based phosphonium, imidazolium and pyrrolidinium ILs with varied structure and lengths of alkyl chains in cations, and varied structures of orthoborate anions. These ILs were studied in bulk at different temperatures, and also in confinements, such as between parallel glass and Teflon plates and in mesoporous Vycor glass. It was found that diffusion coefficients of cations and anions in EAN, phosphonium and pyrrolidinium orthoborate ILs in bulk are different, but according to the standard Stocks-Einstein model, they correspond to diffusion of ions in homogeneous liquids. A change in the chemical structure of one of the ions results in a change in both the diffusion coefficient of the oppositely charged ion and the activation energy of diffusion for both ions in an IL. Similar effects were observed from the chemical shifts and diffusion coefficients measured by NMR for imidazolium orthoborate ILs dissolved in polyethylene glycol solutions, in which imidazolium cations strongly interact with PEG molecules, further affecting the diffusion of orthoborate anions via electrostatic interactions. A liquid-liquid phase separation was suggested for a few phosphonium and pyrrolidinium bis(mandelato)borate ILs, in which a divergence of diffusion coefficients and activation energies of diffusion for cations and anions was detected at temperatures below ca 50 °C. In addition, a free-volume theory was invoked to explain the dependences of density of ILs on the alkyl chain length in cations.It was also found that for a phosphonium bis(salicylato)borate IL confined in 4 nm mesoporous Vycor glass the diffusion coefficients of ions increase by a factor of 35! This phenomenon was explained by the dynamic heterogeneity of this IL in micropores and empty voids of the Vycor glass. For EAN IL in confinements between glass and Teflon plates, the diffusion of ethylammonium cations and nitrate anions is significantly anisotropic, i.e. slower in the direction of the normal to the plates and faster along the plates compared to diffusion of the ions in bulk. A plausible explanation of this PFG NMR data is that EAN forms layers near polar and non-polar solid surfaces. A similar phenomenon, to a lesser extent, was also observed for phosphonium cations of bis(mandelato)borate, bis(salicylato)borate and bis(oxalato)borate confined between glass plates. The results of these studies may have implications in modeling tribological performance, i.e., friction and wear reduction for contact pairs of different materials lubricated by various classes of ionic liquids.
För godkännande; 2016; 20160420 (andfil)
Los estilos APA, Harvard, Vancouver, ISO, etc.
22

Stjernhammar, Lizette y My Ågren. "Laboration och lärande : En litteraturöversikt om laborativa inslag i fysikundervisningen för de lägre årskurserna". Thesis, Högskolan i Halmstad, Akademin för lärande, humaniora och samhälle, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-43071.

Texto completo
Resumen
Syftet med denna litteraturstudie är att ta reda på vår frågeställning Vad säger forskningen om kvaliteter och brister i hur de laborativa inslagen i fysikundervisning genomförs i de lägre årskurserna, samt vad säger forskningen om huruvida eleverna lär sig fysik i dessa inslag? För att besvara frågeställningen och uppnå litteraturstudiens syfte har vi systematiskt och manuellt tagit fram, analyserat och sammanställt vetenskapliga studier om ämnet naturvetenskap med inriktning på fysik och då framförallt laborativ undervisning i de lägre årskurserna, det vill säga F-3. Resultatet visar att det finns en del brister i undervisningen inom detta ämnesområde såsom elevernas lärande och genomförandet i de laborativa inslagen i undervisningen. Det blir ett problem för lärare att tolka styrdokumenten såsom det kanske är tänkt men även att begrepp inom ämnet är viktiga att ha i åtanke och att använda dessa på rätt sätt i elevernas undervisning för optimalt lärande. En aspekt är lärarnas självförtroende och kunskapsinsikt. Detta är relevant att veta då det är lärarna som ska kunna undervisa eleverna inom fysikämnet, som är kopplat till vår frågeställning. Vi har valt att ha lite bredare perspektiv för att sen kunna smalna av det i examensarbete 2 eftersom vi vill ha en grund att stå på inför detta. Vårt förslag på vidare forskning blir att studera de lägre årskurserna och då specifikt inom naturvetenskap och fysik och hur lärarna arbetar med detta laborativt.
Los estilos APA, Harvard, Vancouver, ISO, etc.
23

Rebecka, Vahlström. "Förskollärares kompetensutveckling och förutsättningar för undervisning av fysik i förskolan : En studie av sju förskollärares uppfattningar om deras kompetensutveckling och fortbildning i fysik samt förutsättningar för fysikundervisning i förskolan". Thesis, Karlstads universitet, Institutionen för pedagogiska studier, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-66294.

Texto completo
Resumen
The aim of this study was to investigate seven in-service preschool teachers’ conception of their competence in physics, needs in further educational training and their perceptions around conditions surrounding physics education in preschool. The study is based on a phenomenographic approach where individual interviews have been conducted.The study shows that most of the preschool teachers feels that physics is difficult and something they are struggling with, both when it comes to teaching and understanding the subject themselves. Everyone in the study does not share these thoughts. The conception that also appears is that they do have good knowledge in the subject but not in teaching it. Most of the teachers are open minded in their needs of professional development. They express that they want education in the form of workshops, that both has a basic theoretical and practical approach. A minority feels that they can seek further development themselves through various types of literature. The study shows that there are many aspects of underlying conditions for why they do not teach preschoolers in physics. Perception that stands out are time-economic circumstances, their lack of knowledge in physics, lack of interest in the subject and arguments that indicate that they also use the preschoolers’ lack of interest as a defending argument.
Syftet med studien är att undersöka sju verksamma förskollärares uppfattningar kring deras egen kompetens, behov av fortbildning och deras uppfattningar kring förutsättningar för fysikundervisning i förskolan. Studien grundar sig på fenomenografisk teori och metodologi och semistrukturerade intervjuer har använts som datainsamlingsmetod.Studien visar att majoriteten av förskollärarna uppfattar sina kunskaper i fysik som mindre bra och upplever fysikämnet som svårt. De få som anser sig ha goda kunskaper i fysik uttrycker trots goda kunskaper i ämnet osäkerhet kring hur de ska undervisa i fysik. Studien visar att förskollärarna i allmänhet känner att de behöver kompetensutveckling framförallt i hur de ska undervisa i fysik i förskolan. Majoriteten av förskollärarna i studien vill ha fortbildning i form av workshops eller föreläsningar som har både teoretiska och praktiska inslag. Förskollärarnas uppfattningar om förutsättningar för fysik i förskolan visar på en mängd hinder för utvecklande av fysikundervisningen. De lyfter speciellt det tidsekonomiska begränsningar som finns, bristande kunskaper i fysik, bristande intresse i fysik och använder också barnens intressen som starkt argument till att de inte arbetar med fysik i förskolan.
Los estilos APA, Harvard, Vancouver, ISO, etc.
24

Williamson, Alexander James. "Methods, rules and limits of successful self-assembly". Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:9eb549f9-3372-4a38-9370-a9b0e58ca26b.

Texto completo
Resumen
The self-assembly of structured particles into monodisperse clusters is a challenge on the nano-, micro- and even macro-scale. While biological systems are able to self-assemble with comparative ease, many aspects of this self-assembly are not fully understood. In this thesis, we look at the strategies and rules that can be applied to encourage the formation of monodisperse clusters. Though much of the inspiration is biological in nature, the simulations use a simple minimal patchy particle model and are thus applicable to a wide range of systems. The topics that this thesis addresses include: Encapsulation: We show how clusters can be used to encapsulate objects and demonstrate that such `templates' can be used to control the assembly mechanisms and enhance the formation of more complex objects. Hierarchical self-assembly: We investigate the use of hierarchical mechanisms in enhancing the formation of clusters. We find that, while we are able to extend the ranges where we see successful assembly by using a hierarchical assembly pathway, it does not straightforwardly provide a route to enhance the complexity of structures that can be formed. Pore formation: We use our simple model to investigate a particular biological example, namely the self-assembly and formation of heptameric alpha-haemolysin pores, and show that pore insertion is key to rationalising experimental results on this system. Phase re-entrance: We look at the computation of equilibrium phase diagrams for self-assembling systems, particularly focusing on the possible presence of an unusual liquid-vapour phase re-entrance that has been suggested by dynamical simulations, using a variety of techniques.
Los estilos APA, Harvard, Vancouver, ISO, etc.
25

Ahlin, Karin. "Hur ser en fysiklaboration ut på lågstadiet? : En studie om hur lärare på lågstadiet arbetar på ett undersökande sätt i fysik". Thesis, Karlstads universitet, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-67762.

Texto completo
Resumen
The purpose of this study was to find out how Primary school teachers work and think about the practical teaching in physics. Primary school teachers who work with a teacher support in science and technology, and Primary school teachers who do not work after any program have been interviewed. The method chosen in this study is semi-structured interview with sound recording. A total of seven interviews have been conducted and each interview took about 30 minutes to complete. The study addresses what research today says about practical activities in school and how the children learn the best way. Therefore, teachers are also asked about how they experience physics and practical work and how they choose to put an investigative approach. The result shows that the teachers experience physics as difficult and abstract. Teachers who work with a support program experience that the program helped them teach physics on a deeper level. The study also shows that most teachers uses closed and given labs.
Syftet med studien är att ta reda på hur lågstadielärare arbetar och tänker kring den praktiska undervisningen i fysikämnet. Lågstadielärare som arbetar med lärarstöd i naturkunskap och teknik samt lågstadielärare som inte arbetar efter något program har intervjuats. Metoden som valts vid denna studie är semistrukturerad intervju som spelats in med ljudupptagning. Totalt har sju intervjuer verkställts och varje intervju tog cirka 30 minuters att genomföra. Studien tar upp vad forskning idag säger om praktiska aktiviteter i skolan och hur barnen på bästa sätt lär sig. Därför frågas också lärarna om hur de upplever fysikämnet och praktiskt arbete samt om hur de väljer att lägga upp undervisningen. Resultatet visar att lärarna upplever fysikämnet som svårt och abstrakt. Lärare som arbetar med ett stödprogram upplever att programmet hjälpt dem undervisa i fysik på en djupare nivå. Studien visar också att de flesta lärarna arbetar efter arbetssättet slutna laborationer.
Los estilos APA, Harvard, Vancouver, ISO, etc.
26

Heinze, Martin. "Spectrum and quantum symmetries of the AdS5 × S5 superstring". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17257.

Texto completo
Resumen
Die AdS/CFT-Dualität zwischen N=4 SYM und dem AdS_5 × S^5 Superstring zeigt Quanten-Integrabilität im planaren Limes und erlaubte die Konstruktion mächtiger Methoden, welche das Spektrale Problem zu lösen scheinen. Unser Verständnis der direkten Quantisierung des AdS_5 × S^5 Superstrings ist jedoch weiterhin unbefriedigend und besonders das Spektrum kurzer Stringzustände war bisher nur in führender Ordnung in starker ''t Hooft-Kopplung bekannt. In dieser Arbeit untersuchen wir verschiedene Methoden der perturbativen Quantisierung kurzer Strings über die führende Ordnung hinaus, wodurch wir uns auch einen besseres Verständnis der vorhandenen Quanten-Symmetrien erhoffen. Wir fokusieren auf die niedrigst angeregten Stringzustände, dual zum Konishi-Supermultiplet, und begutachten kritisch eine angeblichen Berechnung der Konishi anomalen Skalendimension im Pure-Spinor-Superstring-Formalismus. Als nächstes betrachten wir den bosonischen AdS_5 × S^5 String in statischer Eichung und konstruieren eine sog. Einzelmoden-Stringlösung, eine Veralgemeinerung des pulsierenden Strings durch unbeschränkte Nullmoden. Diese ist klassisch integrabel und quanteninvariant unter den Isometrien SO(2,4) × SO(6). Mögliche Korrekturen der vernachlässigten Supersymmetrie werden heuristisch berücksichtigt, wodurch die ersten Quantenkorrekturen der Konishi anomale Skalendimension reproduzieren werden. Wir implementieren statische Eichung für den AdS_5 × S^5 Superstring und finden elegante Ausdrücke für die Lagrangedichte und Superladungen. Unter Beschränkung auf das Superteilchen finden wir auf zwei unterschiedliche Arten kanonische Koordinaten in quadratischer Ordnung in Fermionen. Schließlich betrachten wir eine weitere Quantisierungsmethode: Da der Einzelmoden-String die SO(2,4) × SO(6)-Bahn des pulsierenden Strings ist, wenden wir Bahn-Methoden-Quantisierung auf das Teilchen und Spinning Strings in bosonischem AdS_3 × S^3 an und erhalten konsistente Ergebnisse für die Spektra.
The initial AdS/CFT duality pair, the duality between N=4 SYM and the AdS_5 × S^5 superstring, appears to enjoy quantum integrability in the planar limit, which allowed to devise powerful methods ostensibly solving the spectral problem. However, quantization of the AdS_5 × S^5 superstring from first principles is still an open question and especially the spectrum of short string states has previously been derived only at leading order in large ''t Hooft coupling. In this thesis we investigate possible routes to quantize short string states perturbatively beyond the leading order, where equally our aim is to gain better appreciation of the quantum symmetries at play. A prominent role is played by the lowest excited string states, dual to the Konishi supermultiplet, and we start by reviewing critically an asserted derivation of the Konishi anomalous dimension in the setup of pure spinor string theory. Next, we constrain ourselves to bosonic AdS_5 × S^5 String in static gauge, where we construct a so-called single-mode string solution, a generalization of the pulsating string allowing for unconstrained zero-modes. This solution shows classical integrability and invariance under the isometries SO(2,4) × SO(6) at the quantum level. Arguing heuristically about the effects of supersymmetry, we indeed recover the first non-trivial quantum correction to the Konishi anomalous dimension. We continue by implementing static gauge for the full AdS_5 × S^5 superstring and find elegant expressions for the Lagrangian density and the supercharges. We then constrain our interest to the superparticle and, using two different methods, find canonical coordinates at quadratic order in fermions. We conclude by exploring another quantization scheme: As the single-mode string is nothing but the SO(2,4) × SO(6) orbit of the pulsating string, we apply orbit method quantization to the particle and spinning string solutions in bosonic AdS_3 × S^3 yielding consistent results for the spectra.
Los estilos APA, Harvard, Vancouver, ISO, etc.
27

Leite, Ana Catarina de Oliveira. "Optimization of ESPRESSO Fundamental Physics Tests". Dissertação, 2015. https://repositorio-aberto.up.pt/handle/10216/87010.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
28

Leite, Ana Catarina de Oliveira. "Optimization of ESPRESSO Fundamental Physics Tests". Master's thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/87010.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
29

Chibaca, José Caiongo. "Development and Application of Laser Hologram Production Techniques for the Teaching of Physics and the Public Awareness of Science". Master's thesis, 2019. https://hdl.handle.net/10216/126602.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
30

Crawford, David Robert. "Chance Begets Order: Hierarchical Probabilistic Processes in the Natural Sciences". Diss., 2012. http://hdl.handle.net/10161/6184.

Texto completo
Resumen

At the end of the nineteenth century Charles Sanders Peirce wrote that "chance begets order" - indeterministic or `chancy' processes can underlie orderly and seemingly deterministic processes. Indeed, Peirce argues that indeterminism is the seed of all order in the natural world. The dissertation explores this theme in three parts. The first chapter reconstructs and elaborates Peirce's objections against necessitarianism, the position that all natural laws are perfectly orderly, deterministic. The second chapter examines and elaborates Ronald Aylmer Fisher's sophisticated analogy between gas models from statistical mechanics and his own population genetics models. The final chapter treats a contemporary indeterministic account of biological fitness and examines several points on which intuitions from deterministic theories misinterpret this quintessentially indeterministic position. The dissertation motivates an indeterministic theory of natural law and reinvigorates its implications for hierarchical models of the natural world.


Dissertation
Los estilos APA, Harvard, Vancouver, ISO, etc.
31

Chung-I, Lin y 林宗義. "The correlation between Natural Sciences and Living Technologies Course in Junior High School and The First Year Physics Textbook in Senior High School". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/83905812614551185526.

Texto completo
Resumen
碩士
國立彰化師範大學
物理學系
94
With the implementation of Nine-year Integrated Curriculum policy and the High School Provisional Curricular Guideline for 95’s school year, the purpose of this study aims to analyze the prerequisite knowledge and the basic mathematic capability, which first-graders of the senior high school need to have in physics courses. This study also manages to analyze the curriculum articulation of physical concepts and prerequisite knowledge between Natural Science and Living Technologies Course for junior high school students, and the first-grade Physics courses for senior high school students. The research method of the study is content analysis. Firstly, this research sets the categories for textbook content analysis, including category tables of physics concepts and prerequisite knowledge of the senior high first-grade physics textbook, and category tables of the basic mathematic capability. These two category tables are used to analyze 12 volumes of Natural Sciences and Living Technologies Course from two approved publishers, and 4 volumes of the first-grade Physics textbook in senior high school from two approved publishers in 2005 and 2006. The research conclusions are as follows: A. The most-needed prerequisite knowledge of the first-grade physics textbooks for senior high school students includes the physics concepts about Optics, electromagnetism, and thermology. B. Natural Science and Living Technology Courses for junior high school students cannot articulate the curricular sections in high technology and modern physics, which belongs to senior high first-grade physics textbooks. C. No matter which publisher it is, compared the senior high first-grade physics textbooks of 2005 with those of 2006, the content of textbooks is almost invariable, except for the addition of the high technology and modern physics in curriculum. D. The frequency of basic mathematic capability which senior high school first-graders need to utilize in studying physics textbook is in sequence as follows: one-variable linear equation, exponentiation, geometry, direct proportion and inverse proportion, sphericity ,etc.
Los estilos APA, Harvard, Vancouver, ISO, etc.
32

Duquette, Jonathan. "Towards a philosophical reconstruction of the dialogue between modern physics and Advaita Vedanta : an inquiry into the concepts of akasa, vacuum and reality". Thèse, 2010. http://hdl.handle.net/1866/4866.

Texto completo
Resumen
Vers la fin du 19ème siècle, le moine et réformateur hindou Swami Vivekananda affirma que la science moderne convergeait vers l'Advaita Vedanta, un important courant philosophique et religieux de l'hindouisme. Au cours des décennies suivantes, suite aux apports scientifiques révolutionnaires de la théorie de la relativité d'Einstein et de la physique quantique, un nombre croissant d'auteurs soutenaient que d'importants "parallèles" pouvaient être tracés entre l'Advaita Vedanta et la physique moderne. Encore aujourd'hui, de tels rapprochements sont faits, particulièrement en relation avec la physique quantique. Cette thèse examine de manière critique ces rapprochements à travers l'étude comparative détaillée de deux concepts: le concept d'akasa dans l'Advaita Vedanta et celui de vide en physique quantique. L'énoncé examiné est celui selon lequel ces deux concepts pointeraient vers une même réalité: un substratum omniprésent et subtil duquel émergent et auquel retournent ultimement les divers constituants de l'univers. Sur la base de cette étude comparative, la thèse argumente que des comparaisons de nature conceptuelle favorisent rarement la mise en place d'un véritable dialogue entre l'Advaita Vedanta et la physique moderne. Une autre voie d'approche serait de prendre en considération les limites épistémologiques respectivement rencontrées par ces disciplines dans leur approche du "réel-en-soi" ou de la "réalité ultime." Une attention particulière sera portée sur l'épistémologie et le problème de la nature de la réalité dans l'Advaita Vedanta, ainsi que sur le réalisme scientifique et les implications philosophiques de la non-séparabilité en physique quantique.
Toward the end of the 19th century, the Hindu monk and reformer Swami Vivekananda claimed that modern science was inevitably converging towards Advaita Vedanta, an important philosophico-religious system in Hinduism. In the decades that followed, in the midst of the revolution occasioned by the emergence of Einstein's relativity and quantum physics, a growing number of authors claimed to discover striking "parallels" between Advaita Vedanta and modern physics. Such claims of convergence have continued to the present day, especially in relation to quantum physics. In this dissertation, an attempt is made to critically examine such claims by engaging a detailed comparative analysis of two concepts: akasa in Advaita Vedanta and vacuum in quantum physics. What is examined is the claim that both concepts would refer to the same reality — an enduring, subtle and all-pervading physical substratum out of which the constituents of the world come into existence and to which they ultimately return. Based on this study, the dissertation argues that comparisons relying on conceptual affinities alone generally fall short of establishing a productive dialogue between Advaita Vedanta and modern physics. Another approach is to bring into focus the epistemological limits respectively encountered by these systems when attempting to define the content of "reality-in-itself" or "ultimate reality." Emphasis is given to epistemology and the problem of reality in Advaita Vedanta, and scientific realism and philosophical implications of nonseparability in quantum physics.
Los estilos APA, Harvard, Vancouver, ISO, etc.
33

Almeida, Tiago Norberto Béco de. "An Application of Physical Models to the Study of Human Migrations". Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/70534.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
34

Silva, Patrícia Sofia Brás. "Effect of enzymatic and physical gelation methods and Xanthan gum in the gelation capacity of Acheta domesticus flour". Dissertação, 2020. https://hdl.handle.net/10216/132176.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
35

Almeida, Tiago Norberto Béco de. "An Application of Physical Models to the Study of Human Migrations". Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/70534.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
36

Berbée, Vincent. "Der naturwissenschaftliche Bildungsbereich in der Kindertagesstätte: Analyse und Entwicklung didaktischen Materials". 2019. https://tud.qucosa.de/id/qucosa%3A38680.

Texto completo
Resumen
Die Arbeit begründet durch die Betrachtung empirischer Befunde die Notwendigkeit von naturwissenschaftlicher Vorschulbildung, hinterfragt und analysiert bestehendes Bildungsmaterial und entwickelt einen Umsetzungsvorschlag in Form einer Broschüre für die Bildungspraxis von Erzieher_innen. Dazu werden in dieser Arbeit Qualitätsmerkmale naturwissenschaftlicher Bildungsprozesse und naturwissenschaftlichen Bildungsmaterials herausgearbeitet und auf bestehendes Bildungsmaterial angewendet. Das Fazit diagnostiziert den bestehenden Bildungskonzepten ein naturwissenschaftliches Defizit und ein mangelndes Verständnis dafür, was naturwissenschaftliches Vorgehen ausmacht. Es stellt die Anschlussfähigkeit des erworbenen Wissens in Frage und fordert ein Umdenken in der naturwissenschaftlichen Ausbildung von Erzieher_innen.:1. Einleitung 1.1 Problembeschreibung 1.2 Fragestellung 1.3 Methodische Vorgehensweise 2. Naturwissenschaftliche Vorschulbildung in Studien, Lehr- und Bildungsplänen 2.1 Vorschulbildung in empirischen Studien 2.2 Naturwissenschaften im sächsischen Bildungsplan 2.3 Naturwissenschaft im Lehrplan der sächsischen Fachschule für Sozialwesen 3. Theoretische Betrachtung naturwissenschaftlicher Bildung 3.1 Scientific Literacy 3.2 Nature of Science 3.3 Naturwissenschaftliche Konzepte 3.4 Conceptual Change Theorie 3.5 Situationsansatz 3.6 Ziele naturwissenschaftlicher Vorschulbildung 3.7 Qualitätsdimensionen naturwissenschaftlicher Bildung in der Kita 4. Analyse und Bewertung bestehenden Materials für die Kita 4.1 Experimentierbücher 4.2 Broschüren der Stiftung Haus der kleinen Forscher 4.3 Experimentierkästen 5. Entwicklung eines didaktischen Mediums 5.1 Identifikation physikalischer Konzepte 5.1.1 Basiskonzept Materie 5.1.2 Basiskonzept Energie 5.1.3 Basiskonzept Wellen und Schwingungen 5.1.4 Basiskonzept Kräfte und Wechselwirkungen 5.2 Naturwissenschaftliche Denk- und Arbeitsweisen 5.3 Die physikalische Grundbildung der Fachkraft 5.4 Konzipierung des didaktischen Materials 6. Implementierung einer geeigneten naturwissenschaftlichen Bildungspraxis in der Kita 6.1 Gesellschaftliche Akzeptanz 6.2 Entwicklung professioneller Kompetenz 6.3 Verfügbarkeit geeigneten Materials 7. Zusammenfassung 8. Weiterführende Fragen Literaturverzeichnis Anhänge Anhang 1 – Übersicht der empirischen Studien zur vorschulischen Bildung Anhang 2 – Soziale Disparität in der PISA 2015 Studie Anhang 3 – Das Struktur-Prozessmodell nach Roux und Tietze Anhang 4 – Kriterien zur Bewertung naturwissenschaftlichen Bildungsmaterials Anhang 5 – Mathematische Herleitung des Archimedischen Prinzips Anhang 6 – Schatten in unterschiedlichen Beleuchtungssituationen Anhang 7 – Übersicht der physikalischen Realschulbildung Anhang 8 – Broschüre „Physik in der Kita“
Los estilos APA, Harvard, Vancouver, ISO, etc.
37

"An investigation of natural climate variability, sensitivity, and poleward flux using the COADS data set". Tulane University, 1994.

Buscar texto completo
Resumen
Upwelling-diffusion climate models have shown that radiative forcing changes in the ocean surface temperature penetrate only very slowly into the intermediate ocean whereas changes in deep water formation and basin scale upwelling can affect the water temperatures at intermediate depths sizably and quickly. Hence, both mechanisms could be involved in the warming of oceans at intermediate depths that has been observed. Seeing how the heat flux at the ocean-air interface has varied through time would give us an idea of the degree to which it accounts for the rise in intermediate water temperatures and hence the lack of a marked greenhouse warming signal in the temperature record This study also looks at the overall poleward heat transport in the oceans as well as in individual ocean basins and their variation over the years To achieve these goals, the heat flux at the ocean-air interface was calculated for the 1946-1991 period using the Comprehensive Ocean Atmosphere Data Set (COADS). The heat flux was broken down into the four components of shortwave flux, longwave flux, latent, and sensible heat and individual components were calculated by the bulk parameterization method The magnitudes of the individual heat flux calculations were found to depend critically on the parameterization scheme adopted. There was however no difference in the temporal variation or spatial pattern of the individual flux components due to the parameterization scheme adopted. The net heat flux values, in turn, depended on the choice of parameterization schemes and therefore have a high uncertainty in comparison to the greenhouse radiative forcing signal that is expected to be hiding in the ocean There seems to have been a period of high heat flux into the ocean that was tapering off at the beginning of the record being analyzed. From the early 1960s the net heat flux seems to have increased till about 1980 and resumed its decreasing trend since then. One of the three net flux calculations carried out seems to be close to a zero global average for much of the period being analyzed, and therefore, likely to be the real scenario The poleward heat flux calculations show that the Pacific Ocean shows higher magnitudes in the mid latitudes compared to the Atlantic and Indian Oceans. There seems to be a signficant variation in the poleward heat transport in the individual ocean basins over the years with an apparent shift occurring around 1980. (Abstract shortened by UMI.)
acase@tulane.edu
Los estilos APA, Harvard, Vancouver, ISO, etc.
38

Silva, Patrícia Sofia Brás. "Effect of enzymatic and physical gelation methods and Xanthan gum in the gelation capacity of Acheta domesticus flour". Master's thesis, 2020. https://hdl.handle.net/10216/132176.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
39

Silva, Rui Miguel Abreu Vilarinho da. "From Structural Distortions to Physical Properties in Orthorhombic Rare-Earth Perovskites". Tese, 2019. https://hdl.handle.net/10216/119391.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
40

Sousa, André Manuel Alves de. "Deoxyanthocyanidins and derivatives: physical-chemical and antioxidant properties in aqueous solution". Tese, 2015. https://repositorio-aberto.up.pt/handle/10216/79063.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
41

Silva, Rui Miguel Abreu Vilarinho da. "From Structural Distortions to Physical Properties in Orthorhombic Rare-Earth Perovskites". Doctoral thesis, 2019. https://hdl.handle.net/10216/119391.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
42

Sousa, André Manuel Alves de. "Deoxyanthocyanidins and derivatives: physical-chemical and antioxidant properties in aqueous solution". Doctoral thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/79063.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
43

Rodrigues, Ana Sofia Moreira Conde. "Isomerization effect on the physical-chemical properties of ionic liquids and polyphenyls". Tese, 2017. https://repositorio-aberto.up.pt/handle/10216/102436.

Texto completo
Resumen
Ionic Liquids; Polyphenyls; Polyphenylbenzenes; Thermodynamics; Energetics, Isomerization; Thermophysical; Vapour Pressures; Enthalpy; Sublimation; Vaporization; Entropy; Volatility; Heat capacity; Refractive Index; Glass Transition; Phase Behaviour; Calorimetry; Density; Viscosity.
Los estilos APA, Harvard, Vancouver, ISO, etc.
44

Rodrigues, Ana Sofia Moreira Conde. "Isomerization effect on the physical-chemical properties of ionic liquids and polyphenyls". Doctoral thesis, 2017. https://repositorio-aberto.up.pt/handle/10216/102436.

Texto completo
Resumen
Ionic Liquids; Polyphenyls; Polyphenylbenzenes; Thermodynamics; Energetics, Isomerization; Thermophysical; Vapour Pressures; Enthalpy; Sublimation; Vaporization; Entropy; Volatility; Heat capacity; Refractive Index; Glass Transition; Phase Behaviour; Calorimetry; Density; Viscosity.
Los estilos APA, Harvard, Vancouver, ISO, etc.
45

Martins, Zita Emanuela de Sá Veloso. "Reuse of agroindustry by-products to produce new fibre enriched bread formulations: impact in physico-chemical, sensorial and nutritional chraracteristics". Tese, 2017. https://hdl.handle.net/10216/107085.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
46

Martins, Zita Emanuela de Sá Veloso. "Reuse of agroindustry by-products to produce new fibre enriched bread formulations: impact in physico-chemical, sensorial and nutritional chraracteristics". Doctoral thesis, 2017. https://hdl.handle.net/10216/107085.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
47

Fernandes, Paula Maria do Vale. "Assembly of graphene-based nanomaterials on solid surfaces: physical characterization and charge transfer studies". Tese, 2021. https://hdl.handle.net/10216/133322.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
48

Fernandes, Paula Maria do Vale. "Assembly of graphene-based nanomaterials on solid surfaces: physical characterization and charge transfer studies". Doctoral thesis, 2021. https://hdl.handle.net/10216/133322.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
49

Moayyed, Hamed. "Analysis of Plasmonics Based Fiber Optic Sensing Structures". Tese, 2016. https://repositorio-aberto.up.pt/handle/10216/86618.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
50

Santos, Ângela Raquel Gonçalves dos. "On the relation between magnetic activity and stellar oscillations". Tese, 2017. https://repositorio-aberto.up.pt/handle/10216/105114.

Texto completo
Los estilos APA, Harvard, Vancouver, ISO, etc.
También puede estar interesado en las bibliografías sobre el tema "Natural sciences - Physics" para otros tipos de fuentes:
Artículos de revistas Libros
Ofrecemos descuentos en todos los planes premium para autores cuyas obras están incluidas en selecciones literarias temáticas. ¡Contáctenos para obtener un código promocional único!

Pasar a la bibliografía