Search for dissertations about: "the circle method"

Showing result 1 - 5 of 70 swedish dissertations containing the words the circle method.

  2. 1. On the ring lemma

    Author : Jonatan Vasilis; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; ring lemma; circle packing; sphere packing; Apollonian; sphere packing;

    Abstract : The sharp ring lemma states that if n ≥ 3 cyclically tangent discs with pairwise disjoint interiors are externally tangent to and surround the unit disc, then no disc has a radius below cn = (F2n-1 + F2n-2 - 1)-1 – where Fk denotes the kth Fibonacci number – and that the lower bound is attained in essentially unique Apollonian configurations. Here we give a proof by transforming the problem to a class of strip configurations, after which we closely follow a method of proof due to Aharonov and Stephenson. READ MORE

  4. 2. Between square and circle : A study on the behaviour of polygonal steel profiles under compression

    Author : Panagiotis Manoleas; Ove Lagerqvist; Efthymios Koltsakis; Leroy Gardner; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polygonal; RCPS; plate buckling; shell buckling; towers; transmission lines; wind turbines; high strength steel; Stålbyggnad; Steel Structures;

    Abstract : The present study explores the structural properties of regular convex polygonal cross section (RCPS). Such profiles are commonly used to construct masts and towers, e.g.  transmission towers, light poles etc. READ MORE

  5. 3. Radio meteors above the Arctic Circle : radiants, orbits and estimated magnitudes

    Author : Csilla Szasz; Asta Pellinen-Wannberg; Noah Brosch; Umeå universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; meteors; meteoroids; dust; meteor radiants; meteoroid orbits; sporadic sources; radar; meteorradianter; meteoroidbanor; sporadiska källområden; radar; meteorer; meteoroider; interplanetärs stoft; Space engineering; Rymdteknik;

    Abstract : This thesis presents results based on data collected with the 930 MHz EISCAT UHF radar system and three SKiYMet specular meteor radars. It describes in detail a method for meteoroid orbit calculation. The EISCAT UHF system comprises three identical 32 m parabolic antennae: one high-power transmitter/receiver and two remote receivers. READ MORE

  6. 4. Method development for the analysis of protein interactions

    Author : Despoina Kermpatsou; Ola Söderberg; Maréne Landström; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; in situ; proximity ligation assay PLA ; strand displacement; proximity-dependent initiation of hybridisation chain reaction proxHCR ; protein complexes; rolling circle amplification RCA ; MolBoolean; vitamin D; 1; 25D3-MARRS receptor; PDIA3; ERp57; CYP24A1; c-Myc; prostate cancer; Molekylär cellbiologi; Molecular Cellbiology; Molekylär medicin; Molecular Medicine;

    Abstract : Biological processes take place through interactions between macromolecules, such as nucleic acids and proteins. It is, therefore, fundamental to understand the functions of proteins and how they form complexes in order to carry out their role. READ MORE

  7. 5. Some Cases of Kudla’s Modularity Conjecture for Unitary Shimura Varieties

    Author : Jiacheng Xia; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; special cycles; Eisenstein series; spherical designs; central L-values; unitary Shimura varieties; Jacobi forms; rational points; generating functions; the circle method; Kudla s modularity conjecture; theta series; Rankin--Selberg method;

    Abstract : A common theme of the thesis is the interplay of symmetry and rigidity, which is a general phenomenon in mathematics. Symmetry is a notion related to the degree to which an object remains unchanged under transformations, and rigidity is a notion that in terms of physics can be thought of as a lack of freedom, which leads to stronger properties of an object than we normally expect. READ MORE