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 15 of 15 for “"alpha-n"”.
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Reconsideration of Inherent Neutron Sources in Liquid Fuel of Molten Salt Reactors
Calculation of inherent neutron sources from alpha-n and gamma-n reactions in molten fluoride fuel salts using current gamma-n and alpha-n cross-sections and codes where possible. Original inherent neutron source was calculated for Molten Salt Reactor Experiment (MSRE) in 1959 using then-determined …
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Convergence in Ergodic Theory
… transformation T and a weight function w(alpha) → 0 as alpha → 0, is there a p > 0 such that the expression w(alpha)#{ n : 1n k=1nfT kx >a } have a limit, a.s. or in norm, as alpha → 0 for all functions f ∈ Lp0 [0,1]? No, we show. Here # denotes counting measure and f's …
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Reduction of Radiation Produced in Ion Implantation Devices, and Measurement of Some Relevant Cross-Sections
… radiation, particularly of neutrons from the ¹³C(alpha,n)¹⁶O reaction, creating an unacceptable radiation hazard. To address this issue, we undertake dose mapping and modeling efforts to create simulation tools in Geant4 which can accurately predict dose rates on the Axcelis VXE LT. Existing …
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Cluster Effective Field Theory calculation of electromagnetic breakup reactions with the Lorentz Integral Transform method
… to a state consisting of cluster sub-units, the alpha-particles, and possibly a neutron, n. The theoretical study of the cross section in the low-energy regime is conducted by using a three-body ab initio approach. Beryllium-9 exhibits a clear separation of energy scales, since its alpha-alpha-n …
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Tail Asymptotics for the Limiting Distribution of Theta Sums
… to be exponential sums of the form S_{N}(x; \alpha, \beta) := \sum_{n =1}^{N} e((\tfrac{1}{2} n^2 + \beta n)x + \alpha n), where e(z) = e^{2 \pi i z}. If \alpha and \beta are fixed rational numbers, and x is chosen randomly from the unit interval, we use homogeneous dynamics to show that …
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Studies on the rates of mutarotation of the benzyl-N-carbobenzoxy-D-glucosaminides
The independent interconversion of alpha-N-carbobenzoxy-D-glucosaminide to the beta- form, and vice versa, suggests that the proper treatment of the rate data must involve a system of opposing reactions. It is evident from the data cited in the preceding chapter that such opposing rates must …
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Difference Methods for Stiff Delay Differential Equations
… form y'(t) = f(y(t), z(t)), where z(t) = {y(,1)((alpha)(,1)(y(t))),..., y(,n)((alpha)(,n)(y(t)))}('T) and (alpha)(,i)(y(t)) (LESSTHEQ) t arise in many scientific and engineering fields when transport lags and propagation times are physically significant in a dynamic process. Difference methods for …
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The Motional Stark Effect diagnostic on Alcator C-Mod
… by measuring the polarization angle of Balmer-[alpha] n=2) emission from a radially injected hydrogen Diagnostic Neutral Beam (50 keV, 5 A, 50 ms). The Lorentz electric field (EL = v ) and the magnetic field cause the nominally fully degenerate Balmer-[alpha] to split into a partially degenerate …
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Topics in high-dimensional geometry and optimal transport
… First, we show that there exist constants $\alpha,\epsilon>0$ such that for every positive integer $n$ there is a continuous odd function $\psi : S^m\to S^n$, with $m\geq \alpha n$, such that the $\epsilon$-expansion of the image of $\psi$ does not contain a great circle. We also show how …
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Order computations in generic groups
… [theta](N^1/2) group operations to compute abs([alpha])=N. A lower bound of [omega](N^1/2) has been conjectured. We disprove this conjecture, presenting a generic algorithm with complexity o(N^1/2). The running time is O((N/loglogN)^1/2) when N is prime, but for nearly half the integers N..., the …
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Superprobability on Graphs
… that on the complete graph $K_{N}$ with $\beta=\alpha/N$ there is a phase transition similar to that of the Erdős--Rényi random graph: a giant tree percolates for $\alpha > 1$ and all trees have bounded size for $\alpha<1$. In contrast to this, by exploiting an exact relationship with the …
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Topics in combinatorial and computational geometry
… arrangement of segments that runs in time $O(n\alpha\sp2(n)\ \log\ n)$ where $\alpha(n)$ is a very slowly growing function.
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Beatty ratios, algorithms related to Sturmian sequences and uniform distribution theory
… sizes in the sequence of fractional parts $\{\alpha n\}_{n<N}$. The main discovery of this section is that if we average over a short interval $[\gamma,\gamma+\eta]$, the distribution becomes continuous. Moreover, this continuous distribution is universal in the sense that it is the same for …
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Observational aspects of dark energy
… estimate a spatially varying rotation angle $\alpha(n)$. We use this estimator to quantify the prospects of detecting such a rotation field with forthcoming experiments. For PLANCK and CMBPol we find that the estimator containing the product of the $E$ and $B$ components of the polarization …
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EPIDEMIOLOGIA GENOMICA DELLE PRINCIPALI VARIANTI DI SARS-COV-2 CIRCOLANTI IN ITALIA PRIMA E DURANTE L'ERA OMICRON
… before and during Omicron era, such as 20E.EU1, Alpha, Delta variants and Omicron BA.1, BA.2 and BA.5, respectively. Material and methods The nasopharyngeal swabs of COVID-19 patients attending more than 70 clinical centers distributed throughout whole Italy, participating in the collaborative …