The Elastic Closet
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The Elastic Closet
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Author : S. Gunther
language : en
Publisher: Springer
Release Date : 2008-11-12
The Elastic Closet written by S. Gunther and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-11-12 with History categories.
A history of French homosexuals since 1942 in the interconnected realms of law, politics and the media, with a focus on the complex relationship between French republican values and the possibilities they have offered for change in each of these three spheres.
The Elastic Closet
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Author : Scott Eric Gunther
language : en
Publisher:
Release Date : 2001
The Elastic Closet written by Scott Eric Gunther and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Gays categories.
Principles And Practice Of Plumbing
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Author : Samuel Stevens Hellyer
language : en
Publisher:
Release Date : 1893
Principles And Practice Of Plumbing written by Samuel Stevens Hellyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1893 with Plumbing categories.
Official Gazette Of The United States Patent Office
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Author : United States. Patent Office
language : en
Publisher:
Release Date : 1929
Official Gazette Of The United States Patent Office written by United States. Patent Office and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1929 with Patents categories.
Lattice Dynamics
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Author : Johan Tidholm
language : en
Publisher: Linköping University Electronic Press
Release Date : 2020-11-02
Lattice Dynamics written by Johan Tidholm and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-02 with Electronic books categories.
The reason to perform calculations in material science usually falls into one of two categories: to predict or explain the origin of material properties. This thesis covers first-principle calculations for solids at extreme conditions, from both of the two mentioned categories. I primarily have studied the effects of high-pressure and high-temperature on lattice dynamics, mechanical and electronic properties. To treat the effects of temperature, ab initio molecular dynamics (AIMD) simulations and self-consistent phonon calculations, based on density functional theory, have been utilised. These approaches account for the temperature effects by considering thermally excited supercells as samples of a statistical ensemble. To extract properties from this representation, I have used methods which maps the supercell data to a unit cell representation or fits it to a simple model Hamiltonian. The small displacement method was used to analyse the dynamical stability for nitrides and polymorphs of silica, synthesised at high-pressure in a diamond anvil cell. The nitride compounds consist of a high amount of nitrogen either as chains, forming a porous framework together with transition metal atoms or as dinitrogen molecules, occupying the channels of the framework. The nitrogen chains consist of single- or double-bonded nitrogen atoms, making these compounds highly energetic. Polymorphs of silica can be used to model deep Earth liquids. These new polymorphs, named coesite-IV and coesite-V, consist of four-, five-, and six-oriented silicon. Some of the octahedra of the six-oriented silicon atoms, of these new phases, are sharing faces, which according to Pauling's third rule would make them highly unstable. My phonon calculations indicate these phases to be dynamically stable. Furthermore, my calculations predict higher compressibility for these new phases compared to the competing ones. By modelling silicate melts with coesite-IV and coesite-V, a more complex and compressible structure is expected, affecting the predicted seismic behaviour. I studied Kohn anomalies for body-centered cubic niobium by simulating this material with self-consistent phonon calculations. The electronic structure was studied by using a band unfolding technique, for which I obtained an effective unit cell representation of the electronic structure at elevated temperatures. Temperature primarily smeared the electronic states but did not induce significant shifts of the bands. In parallel, the anharmonicity of this system was studied using the temperature dependent effective potential method. Even close to the melting temperature, this element is remarkably harmonic. The experimentally observed disappearance of the Kohn anomalies with increased temperature is predominantly dependent, according to my calculations, on the temperature-induced smearing of the electronic states. Using stress-strain relations, accurate high-temperature elastic properties were predicted for Ti0.5Al0.5N. The simulations were performed with AIMD. The stresses were fitted using the least-squares method to a linear expression from which the elastic constants were derived. The results were compared with previously performed calculations that employed additional approximations. The results of the symmetry imposed force constant temperature dependent effective potential (SIFC-TDEP) method agrees well with our results. I also compared my results with TiN calculations that employed a similar methodology. My and the SIFC-TDEP results are reporting lower values for the polycrystalline moduli than the calculations for TiN. The data I generated were also used for a machine learned interatomic potential method, where moment tensor potentials were trained and evaluated, using this data. Den här avhandlingen handlar om beräkningar för material. När materialberäkningar utförs är det antingen för att förutsäga eller förklara egenskaper. De beräkningar som jag har gjort i denna avhandling är baserade på fundamentala fysiska lagar. Detta betyder att de är rent baserade på teori, och inte har anpassats efter resultat av experiment. Jag har i mitt arbete använt mig mycket utav en teori som kallas gitter dynamik. Den är definierad för periodiska material, det vill säga att atomerna i dessa material upprepas i periodiska mönster. Vi kan då anta att det finns en jämviktspunkt för alla atomerna, som de vibrerar omkring. Dessa vibrationer kan beskrivas som om atomerna påverkar varandra med fiktiva fjädrar. Genom att beräkna styrkan för dessa fjädrar kan vi beskriva vibrationerna av atomerna. Dessa vibrationer i sin tur är avgörande för materialets egenskaper. För att beskriva ett material vid en specifik temperatur har jag använt mig utav olika metoder för att simulera det. En simulering kan ses som ett “dator experiment”. Problemet är dock hur vi ska mäta egenskaperna i simuleringen. Ju större och mera komplex en simulering är, desto svårare blir det att beräkna egenskaperna av det simulerade materialet. Vi hamnar i en situation likt den vi skulle befinna oss om vi hade gjort ett experiment i verkligheten, och tvingas använda förenklade modeler för att kunna tolka resultatet. Jag har därför använt mig utav metoder för att utvinna vibrationer av atomer, elektrontillstånd eller elastiska egenskaper, specifikt utvecklade för att användas på denna typ utav simuleringar. Mitt arbete har kretsat kring hur dessa egenskaper påverkas av extrema temperaturer och tryck. De beräkningar jag har utfört vid höga tryck har varit för nyupptäckta nitrider och faser av kiseldioxid. Nitriderna är porösa material som innehåller en stor mängd kväve. Det höga kväveinehållet gör så att det lagras en stor mängd kemisk energi i enkel- och dubbelbindningar mellan kväveatomerna. De nya faserna av kiseldioxid har en betydelse för vår förståelse av jordens inre. Deras existens öppnar upp för att det kan finnas mera komplexa och ihoptryckbara flytande material, under jordens nedre mantel, än vad tidigare har varit antaget. Mina beräkningar har bekräftat strukturerna för dessa nyupptäckta material. Vid höga temperaturer har jag studerat för metallen niob hur vibrationerna av atomerna är relaterade till olika elektrontillstånd. För specifika vibrationer ökar frekvensen med ökad temperatur. Detta är något ovanligt eftersom vibrationernas frekvenser vanligtvis brukar minska med ökad temperatur. Mina simulering för denna metal överensstämmer med resultat från experiment. Orsaken till varför visa vibrationers frekvenser ökar kan jag förklara med att elektrontillståndens enskilda energier varierar över tid på grund av den ökade temperaturen. Jag har även använt mig av simuleringar för att beräkna elastiska egenskaper av legeringen Ti0.5Al0.5N. Ti1?xAlxN legeringar används som beläggningar på skärverktyg som används för metall. För att öka effektiviteten av beläggningen, behövs det detaljerad kunskap av dess mekaniska egenskaper för den temperatur som de används vid. Jag beräknade därför så noggrant som möjligt de elastiska egenskaperna för Ti0.5Al0.5N. Dessa beräkningar är avsedda för att användas som en referens för andra beräkningsmässigt billigare metoder. Datan som genererades från mina simuleringar användes även för en sådan metod, baserad på maskininlärning.
The Sanitary Record
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Author : ernest hart
language : en
Publisher:
Release Date : 1883
The Sanitary Record written by ernest hart and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1883 with categories.
The Sanitary Record And Journal Of Sanitary Municipal Engineering
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Author :
language : en
Publisher:
Release Date : 1883
The Sanitary Record And Journal Of Sanitary Municipal Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1883 with Sanitary engineering categories.
The Sanitary Record And Journal Of Sanitary And Municipal Engineering
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Author :
language : en
Publisher:
Release Date : 1882
The Sanitary Record And Journal Of Sanitary And Municipal Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1882 with Municipal engineering categories.
The Exhibition Record A Descriptive Account Of The Principal Exhibits Compiled From Special Suppl Issued With The Sanitary Record
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Author : International health exhibition, 1884
language : en
Publisher:
Release Date : 1882
The Exhibition Record A Descriptive Account Of The Principal Exhibits Compiled From Special Suppl Issued With The Sanitary Record written by International health exhibition, 1884 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1882 with categories.
Bungalow Bathrooms
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Author : Jane Powell
language : en
Publisher: Gibbs Smith
Release Date : 2001
Bungalow Bathrooms written by Jane Powell and has been published by Gibbs Smith this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Architecture categories.
This hands-on sourcebook shows how to create and restore a stylish bathroom in the Arts and Crafts spirit. Full color.