Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"new particle"”.
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Ion dynamics and aerosol mass spectrometry during atmospheric new particle formation
Eine große Zahl atmosphärischer Aerosolpartikel entsteht durch häufig auftretende sekundäre Neubildungsprozesse. Die aus Vorläufergasen entstehenden Partikel tragen zu einem großen Teil zur Gesamtpartikelanzahl in der Atmosphäre bei und haben somit einen weitreichenden Einfluss auf das Klima. Die …
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Observation of New Particle Formation in the Northern Hemisphere at Altitude from 4 to 20 km
<p>New particle formation (NPF) is investigated using measurements of aerosol size distributions and meteorological variables made in two continents, including USA and Europe. Despite the considerably different aerosol particle abundances among the sites, a common relationship was found between the …
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Organic particle formation in halogen-influenced environments
… bromine was studied in laboratory experiments. New particle formation was initiated about five times faster by chlorine than by bromine. While new particle formation was observed at mixing ratios of 2.5 ppb Cl2 and 10 ppb α-pinene, new particle formation with bromine was not observed below 10 …
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Observation and measurement of a standard model Higgs Boson-like diphoton resonance with the CMS detector
This thesis concerns the observation of a new particle and the measurements of its properties, from the search of the Higgs boson through its decay into two photons at the CMS experiment at CERN's Large Hadron Collider (LHC), on the full LHC "Run I" data collected by the CMS detector during 2011 …
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A tale of two particles
… two astrophysical systems in the context of new particle physics. Taking a phenomenological approach, we calculate observable consequences of novel particle models during two different stages in the development of our universe. First, we explore the possibility that nonminimally coupled …
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Observation and examination of a Higgs boson in the ZZ to four lepton channel
… examine the transverse momentum spectrum of the new particle and find it to be consistent with the SM expectation, and also determine that the Standard Model JPC = 0++ is favored over the plausible alternative hypotheses.
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Developing efficient configurational sampling : structure, formation, and stability of atmospheric molecular clusters
A suspension of fine solid particles and liquid droplets in the air is called an aerosol. Atmospheric aerosols play an important role in climate and also affect human health. Some of these aerosols are formed in the atmosphere by collisions of gas molecules with favorable interactions. The …
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An efficient multinomial sampling algorithm for spatially distributed stochastic particle simulations
This study develops a new particle-resolved method (PGM) for stochastically simulating the transport of particles by advection and diffusion processes. This particle-resolved method is based on a multinomial sampling algorithm which calculates the number of particles transferred between adjacent …
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Sulfuric acid and amines in atmospheric clustering : first-principles investigations
… involving minuscule atmospheric aerosol particles pose many important and currently unresolved questions. The research presented in this doctoral dissertation concentrates on one of the most fundamental of these questions: where do the smallest particles come from? This thesis …
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Development and Application of Particle Image Velocimetry in High-Speed Separated Flow: Two-Dimensional Base Cavities
A new particle image velocimetry (PIV) system has been developed to obtain two-dimensional instantaneous velocity data over a planar region in high-speed separated flows for the quantitative analysis of turbulent and unsteady flow structures. This PIV system is the first of its type to incorporate …
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Evidence for a narrow Higgs-like diphoton resonance with a mass of 125 GeV in pp collisions at [square root of]s = 7 - 8 TeV
… deviations. This constitutes evidence for a new particle decaying to diphotons with a mass of around 125 GeV. The rate of observed events is consistent with predictions for the standard model Higgs boson.
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Measurement of Exclusive Photo-Production of K+ Σ*- Quasi-Free off Neutrons In Deuterium
… careful detector calibration and developing a new particle identification method and event selection, a very clean data sample with high signal-to-background ratio was obtained with little data loss. This enables us to obtain results agreeing with previous published data and greatly extending …
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Efficient particle methods for solving the Boltzmann equation
A new particle simulation method for solving the Boltzmann equation is presented and tested. This method holds a significant computational efficiency advantage for low-signal flows compared to traditional particle methods such as the Direct Simulation Monte Carlo (DSMC). More specifically, the …
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Immersed Finite Element Particle-In-Cell Simulations of Ion Propulsion
A new particle-in-cell algorithm was developed for plasma simulations involving complex boundary conditions. The new algorithm is based on the three-dimensional immersed finite element method which is developed in this thesis, and a modified legacy particle-in-cell code. The model also applies a …
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The design of multifunctional hydrogel nanoparticles for drug delivery
Hydrogel micro- and nanoparticles (microgels and nanogels) are a promising class of drug delivery vehicles. Composed of hydrophilic polymers arranged into a cross-linked network structure, nanogels show several attractive features for the delivery of macromolecule therapeutics. For instance, the …
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Stochastic histories of dust grains in the interstellar medium
… In order to record chemical detail, we take each new particle to consist of a superrefractory core plus a more massive refractory mantle. The particles are allowed to transfer to and fro between the different phases of the ISM until either the particles are destroyed or the program finishes. The …
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Computer Simulation of Ion-Induced Nucleation in the Presence of Single Ions and Ion Pairs
Atmospheric aerosol particles play an important role in climate and human health. Despite their importance, the mechanisms of their formation are still poorly understood. Ion-induced nucleation may play a role in the process, but details are lacking about how the nucleation rate depends on the …
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Searches for Diboson New Physics and the L1Calo Software Development with the ATLAS Detector
… in describing the behaviour of fundamental particles, but there are still problems remaining unsolved. New theoretical models are therefore proposed to answer those questions with either new interactions or new particles. This thesis is presenting the searches for new physics with diboson …
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Precipitation growth processes in the comma head region of an east coast winter storm
… total number concentration. Interpretations of particle growth were thus consistent with vapor deposition and aggregation, with no evidence of riming as no supercooled liquid water was observed within this region. In the cloud-top generating cell region, new particle habits were observed within …
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