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Showing 1 to 20 of 109 for “"helicity"”.
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Submanifold Helicity
In this thesis we will focus on the topic of helicity. Helicity gives us a way to measure the coiling of flow lines in a vector field, computed by the formula [see formula in PDF file] . To start our exploration of helicity we begin with the topic of differential forms and their correspondence with …
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Helicity density matrix formalism and polarized processes in QCD
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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A Study of Magnetic Helicity in Decaying and Forced 3D-MHD Turbulence
… from small scales to large scales) of magnetic helicity. Magnetic helicity is defined as the volume integral of the dot product of the magnetic field and the magnetic vector potential. It characterizes the linkage and twists of the magnetic field lines. The inverse cascade is believed to be one …
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Hydrogen bonding in aqueous solution and peptide helicity studied using model systems
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.
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Validation of solar flare forecasting & evolution of magnetic helicity of two active regions
… The temporal evolution of the relative magnetic helicity of two ARs, AR 11072 and 11158 is investigated. The former is flare-quiet while the latter is flare-productive over the 5-day observation period. It is found that for both regions, the shear-term is a predominant factor of magnetic helicity …
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Study of magnetic helicity in solar active regions and its relationship with solar eruptions
… interlinkages of magnetic field lines. Magnetic helicity has been recognized as a useful measure for these properties of a given magnetic field system. Magnetic helicity studies have been naturally directed to the energy buildup and instability leading to solar eruptions. However, in spite of …
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Probing the Role of Nascent Helicity in Protein Function: p27kip1 as a Regulator of the Cell Cycle
<p>p27<sup>kip1</sup> binds to and regulates the activity of cyclin-dependent kinases (Cdks) which are the master timekeepers of the cell division cycle. Members of the p27 family of proteins, also including p21 and p57, are called cyclin-dependent kinase inhibitors (CKIs). The amino terminal …
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The radiance of the gluon spin : constraining the proton spin structure with the direct photon double helicity asymmetry
… from an initial-state gluon, the double-helicity asymmetry directly probes the underlying gluon polarization and provides much stronger experimental constraints. Asymmetries measured with hadronic final-states have already improved the understanding of the proton spin structure …
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Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at [the square root of sigma]=200 GeV at STAR
One of the primary goals of the spin physics program at the STAR experiment is to constrain the polarized gluon distribution function, [delta]g(X,Q²), by measuring the double longitudinal spin asymmetry, ALL, of various final-state channels. Neutral pions provide a potentially powerful final state …
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Double helicity asymmetry for charged pion + jet production in p+p collisions at [square root of] s=200 GeV at STAR
Inclusive measurements from polarized proton-proton collisions at RHIC have constrained [Delta]g, the polarized gluon distribution function of the proton. Correlation observables, such as this pion+jet measurement, allow for reconstruction of initial parton kinematics and are thus sensitive to the …
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Finite-beta simulations of HIT-SI and HIT-SI3 using the NIMROD code
The Helicity Injected Torus with Steady Inductive helicity injection (HIT-SI) and HIT-SI3 experiments are a pair of devices that form and sustain spheromak plasmas through the use of Steady Inductive Helicity Injection (SIHI). SIHI is accomplished through a set of semi-toroidal injectors that …
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Experimental characterization of polyalanine helices in short and long contexts
… are used in combination to quantify fractional helicity in order to determine the intrinsic helical propensity of an alanine residue, free from the hydrophobic packing within proteins. Constructed cross checks between these methods add rigor to propensity assignments and present the opportunity …
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Study of CP-violation at the Belle experiment
… decay is a scalar → vector vector decay, three helicity configurations are present. Exploiting the helicity configura- tions via angular analysis, the time-dependent CP-violation parameters encoding 2ϕ1 +ϕ3 are obtained from the fit. 1
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A search for parity non-conservation in polarized proton-nucleon scattering at 6 GEV/C
… of the total proton-nucleon cross section on the helicity of the incident proton. A dependence of the total cross section on the proton helicity is a measure of the strength of the weak interaction in the hadronic system. The cross section was determined by measuring the transmission of 6 GeVlc …
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Effective field theories for the LHC
… collinear effective theory, I also develop a helicity operator basis, which facilitates matching calculations to fixed order computations performed using spinor-helicity techniques, and demonstrate its utility by computing an observable relevant for studying the properties of the newly …
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Design and Synthesis of Hyaluronan:RHAMM Interaction Inhibitors
… the effects cyclizing each binding domain has on helicity and its biological effect. Eighteen peptides were synthesized and cyclized using lactam bridges. The peptides were analyzed by circular dichroism spectroscopy and one stapled peptide exhibited a 4-fold increase in helicity compared to the …
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Exploratory physics-based turbulent flow modification using distributed computing architectures
… structures that selectively alter the energy and helicity of the flow, and the scales at which they are applied. We find that selective helicity modification may excite certain Kelvin (twist) modes within individual vortex tubes. Further, we present python bindings to a supersonic GPU accelerated …
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A QED framework for nonlinear and singular optics
… flux, delivering results proportional to the helicity and spin angular momentum in monochromatic beams. A new polarisation basis is introduced to determine the maximum values that an infinite family of optical helicity- and spin- type measures may take, and disproves recent claims of …
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Accuracy and precision in collider event shapes
… the possible precision of calculations. On-shell helicity methods provide powerful tools for determining scattering amplitudes, which have a one-to-one correspondence with leading power helicity operators in SCET away from singular regions of phase space. We show that helicity based operators are …
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