Now showing items 181-200 of 475

    • Identifying boosted objects with N-subjettiness and linear k-means clustering 

      Van Tilburg, Ken (Massachusetts Institute of Technology, 2011)
      In this thesis, I explore aspects of a new jet shape - N-subjettiness - designed to identify boosted hadronically-decaying objects (with a particular focus on tagging top quarks) at particle accelerators such as the Large ...
    • Imaging black holes with simulated space expansions to the event horizon telescope 

      Palumbo, Daniel(Daniel C.) (Massachusetts Institute of Technology, 2018)
      The Event Horizon Telescope (EHT) is a multinational Very-Long-Baseline Interferometry (VLBI) network of dishes joined to resolve general relativistic behavior near a supermassive black hole. The imaging quality of the EHT ...
    • Imaging the invisible : constraining dark matter distributions in galaxy clusters using strong gravitational lensing 

      Corless, Virginia Leigh (Massachusetts Institute of Technology, 2005)
      In this thesis, I design and construct a Monte-Carlo gravitational lensing simulation that statistically studies the strong lensing of extended galactic sources by dark matter distributions in galaxy clusters, using recent ...
    • Imaging the two gaps of the high temperature superconductor Pb-Bi₂Sr₂CuO₆₊x 

      Yi, Ming, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2007)
      The nature and behavior of electronic states in high temperature superconductors are the center of much debate. The pseudogap state, observed above the superconducting transition temperature Tc, is seen by some as a precursor ...
    • Implementation and performance evaluation of a GPU particle-in-cell code 

      Payne, Joshua Estes (Massachusetts Institute of Technology, 2012)
      In this thesis, I designed and implemented a particle-in-cell (PIC) code on a graphical processing unit (GPU) using NVIDA's Compute Unified Architecture (CUDA). The massively parallel nature of computing on a GPU nessecitated ...
    • Implementation of scattering pinhole diagnostic for detection of fusion products on CR-39 at high particle fluence 

      Orozco, David, S.B. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2014)
      Many Inertial Confinement Fusion (ICF) experiments use solid-state nuclear track detector CR-39 as a means to detect different types of nuclear products. Until recently, it was difficult to use CR-39 in experiments with ...
    • Implementation of side-fringe locking in an SHG cavity 

      Moore, Sam, S.B. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2016)
      An alternative method for locking a second-harmonic generation (SHG) cavity on resonance is described and implemented. The usual method, Pound-Drever-Hall locking, is prone to long-term power fluctuations from power ...
    • Impulse damping in structural materials 

      Gessel, David Jacob (Massachusetts Institute of Technology, 1990)
    • Incoherent scatter radar detection of enhanced plasma line in ionospheric E-region over Arecibo 

      Pradipta, Rezy (Massachusetts Institute of Technology, 2006)
      A series of incoherent scatter radar (ISR) observation were conducted at the Arecibo Observatory from December 27, 2005 until January 3, 2006. From plasma line measurements that were taken during this radar campaign, we ...
    • Influence of gene expression gradients on positional information content in fly embryos 

      Hastewell, Alasdair (Massachusetts Institute of Technology, 2018)
      The concept of positional information was introduced to qualitatively explain how individual cells are involved in forming patterns. Recent experimental and theoretical developments have made studying specific biological ...
    • Infrared photoconductive PbTe film processing and oxygen sensitization 

      Klingshim, Christopher J (Massachusetts Institute of Technology, 2015)
      Infrared (IR) thermal detectors and photodetectors have significant applications including thermal imaging, infrared spectroscopy and chemical and biological sensing. In this work we focus on photodetectors, which typically ...
    • Initial analysis towards a measurement of the branching fractions B [right arrow] [rho][gamma] and B [right arrow] [omega][gamma] 

      Bright, Molly (Molly Gallogly) (Massachusetts Institute of Technology, 2006)
      The Standard Model of particle physics predicts the existence of the "Unitary Triangle," which graphically relates the matrix elements of the Cabbibo Kobayashi Maskawa matrix and describes the strength of transformations ...
    • An injection-locked 674 nm laser for Strontium-88 ion trapping 

      Katz, Rena J. (Rena Jenelle) (Massachusetts Institute of Technology, 2012)
      Energy levels of the valence electron of a single trapped ⁸⁸Sr+ ion can be harnessed as an effective qubit for quantum information processing. The qubit transition to a metastable energy state can be stimulated by a laser ...
    • Instabilities of rotating jets 

      Zahniser, Russell, 1982- (Massachusetts Institute of Technology, 2004)
      When a jet of water is in free fall, it rapidly breaks up into drops, since a cylinder of water is unstable. This and other problems involving the form of a volume of water bound by surface tension have yielded a wealth ...
    • Instrumentation and algorithms for electrostatic inverse problems 

      Strachan, John Paul, 1978- (Massachusetts Institute of Technology, 2001)
      This thesis describes tracking objects with low-level electric fields. A physical model is presented that describes the important interactions and the required mathematical inversions. Sophisticated hardware used to perform ...
    • Intense spreading of radar echoes from ionospheric plasmas 

      Dorfman, Seth E (Massachusetts Institute of Technology, 2005)
      On December 25, 2004, a large-scale ionospheric plasma bubble was observed over Arecibo Observatory in Puerto Rico, inducing significant range spreading on ionograms. This phenomena may be explained by means of the E x B ...
    • Interactions of neutrons with silicon CCD chips 

      Sahin, Timur Cemal (Massachusetts Institute of Technology, 2011)
      Dark matter makes up approximately 22% of the energy density of the universe and as much as 83% of its matter composition. Despite its ubiquitous nature, it remains incredibly difficult to detect due to the weakness of its ...
    • The interior Casimir problem 

      Zaheer, Saad (Massachusetts Institute of Technology, 2009)
      We study the electromagnetic Casimir interaction of a metallic compact object with a compact and bounded metallic surface in which it is contained. We express the interaction energy in terms of the objects' scattering ...
    • Interrogating the void : the difficulty of extracting information from many-body systems 

      Diab, Kenan S. (Kenan Sebastian) (Massachusetts Institute of Technology, 2011)
      In this thesis, I will explore some of the ways the information-theoretic properties of quantum many-body systems can be analyzed. I do this in two different settings. First, I will describe an approach to the "scrambling ...
    • Intersecting brane landscape 

      Rosenhaus, Vladimir (Massachusetts Institute of Technology, 2009)
      This thesis studies intersecting brane models, which are a class of quasi-realistic compactifications of string theory. Techniques are developed for exploring the complete space of intersecting brane models on an orientifold. ...