16 research outputs found
Application of Bayesian Belief Network for Agile Kanban Backlog Estimation
What is Agile Kanban? Different from Kanban for JIT manufacturing! Visualization of workflow Limit work in process (WIP
Experimental ionization of atomic hydrogen with few-cycle pulses
We present the first experimental data on strong-field ionization of atomic
hydrogen by few-cycle laser pulses. We obtain quantitative agreement at the 10%
level between the data and an {\it ab initio} simulation over a wide range of
laser intensities and electron energies
Ionization and ionization-excitation of helium to the n=1–4 states of He+ by electron impact
We present experimental and theoretical results for the electron-impact-induced ionization of ground-state helium atoms. Using a high-sensitivity toroidal electron spectrometer, we measured cross-section ratios for transitions leading to the first three excited states of the residual helium ion relative to the transition leaving the ion in the ground state. Measurements were performed for both symmetric- and asymmetric-energy-sharing kinematics. By presenting results as a ratio, a direct comparison can be made between theoretical and experimental predictions without recourse to normalization. The experimental data are compared to theoretical predictions employing various first-order models and a second-order hybrid distorted-wave + convergent R matrix with pseudostates close-coupling approach. All the first-order models fail in predicting even the approximate size of the cross-section ratios. The second-order calculations are found to describe the experimental data for asymmetric-energy-sharing with reasonable fidelity, although significant disparities are evident for the symmetric-energy-sharing cases. These comparisons demonstrate the need for further theoretical developments, in which all four charged particles are treated on an equal footing.S. Bellm, J. Lower, K. Bartschat, X. Guan, D. Weflen, M. Foster, A. L. Harris, and D. H. Madiso
Carrier-envelope phase effects in few-cycle ionisation of atomic hydrogen
We have observed carrier-envelope phase effects in the ionisation of atomic hydrogen exposed to an intense few-cycle laser pulse. Experimental data show good agreement with an advanced ab initio time dependent Schrodinger equation simulation
Above-threshold ionization in atomic hydrogen using intense, few-cycle laser pulses
The interaction of intense few-cycle light pulses and matter has given rise to a number of high-field physical processes that are of great interest. The high non-linearity of such interactions necessitates complex numerical simulations in order to retrieve useful physical measurements from the experimental data. Here we demonstrate quantitative agreement at the 10% level between experimentally obtained integrated photoelectron spectra and numerical simulations for above-threshold ionization in the intense few-cycle regime. The use of atomic hydrogen provides a key experimental innovation as it is the only electronic system for which ab initio simulations in this regime are available
Above-threshold ionization in atomic hydrogen using intense few-cycle laser pulses
We have performed the first strong-field ionization experiment in atomic hydrogen using few-cycle laser pulses. Quantitative agreement between experimental data and advanced ab initio simulations has been achieved at the 10% level
CellMapper: rapid and accurate inference of gene expression in difficult-to-isolate cell types
We present a sensitive approach to predict genes expressed selectively in specific cell types, by searching publicly available expression data for genes with a similar expression profile to known cell-specific markers. Our method, CellMapper, strongly outperforms previous computational algorithms to predict cell type-specific expression, especially for rare and difficult-to-isolate cell types. Furthermore, CellMapper makes accurate predictions for human brain cell types that have never been isolated, and can be rapidly applied to diverse cell types from many tissues. We demonstrate a clinically relevant application to prioritize candidate genes in disease susceptibility loci identified by GWAS. Electronic supplementary material The online version of this article (doi:10.1186/s13059-016-1062-5) contains supplementary material, which is available to authorized users