William E. Stein
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View article: First direct observation of FEL (free-electron laser) lasing from. lambda. = 20 to 45. mu. m
First direct observation of FEL (free-electron laser) lasing from. lambda. = 20 to 45. mu. m Open
In recent experiments at Los Alamos, we directly observed for the first time free-electron laser (FEL) fundamental wavelengths from 20 to 45{mu}m. Our 1988 facility's demonstrated wavelength span now extends from 9 to 45{mu}m. Upgrades are…
View article: Emittance studies at the Los Alamos National Laboratory Free-Electron Laser
Emittance studies at the Los Alamos National Laboratory Free-Electron Laser Open
Recent emittance studies at the Los Alamos FEL have indicated several areas of concern in the linac and beamline feeding the wiggler. Four emittance growth mechanisms of special importance have been studied. First, a rapid growth of the el…
View article: Microwave accelerator E-beam pumped laser
Microwave accelerator E-beam pumped laser Open
A device and method for pumping gaseous lasers by means of a microwave accelerator. The microwave accelerator produces a relativistic electron beam which is applied along the longitudinal axis of the laser through an electron beam window. …
View article: A New Reconstruction of the Iridopteridalean <i>Ibyka amphikoma</i> Skog et Banks from the Middle Devonian of Gilboa, New York State
A New Reconstruction of the Iridopteridalean <i>Ibyka amphikoma</i> Skog et Banks from the Middle Devonian of Gilboa, New York State Open
Premise of research. Clarifying the basic anatomy and morphology of Devonian fossils is essential for understanding the origin and radiation of land plants in deep time. Iridopteridales is a major Devonian plant group for which there is no…
View article: The classic mid-Devonian Eospermatopteris localities, Gilboa NY. USA. Map and data.
The classic mid-Devonian Eospermatopteris localities, Gilboa NY. USA. Map and data. Open
A. Paleosol Map from Riverside Quarry in afdesign and psd formats. B. Riverside Quarry Objects - database containing all identified plants in MS Excel format. C. Riverside Quarry Root mound measurements in MS Excel format. D. Riverside Qua…
View article: Peer Review #1 of "Keraphyton gen. nov., a new Late Devonian fern-like plant from Australia (v0.1)"
Peer Review #1 of "Keraphyton gen. nov., a new Late Devonian fern-like plant from Australia (v0.1)" Open
The first plants related to the ferns are represented by several extinct groups that emerged during the Devonian.Among them, the iridopterids are closely allied to the sphenopsids, a group represented today by the genus Equisetum.They have…
View article: JohnCremona/eclib v20190226
JohnCremona/eclib v20190226 Open
Changes since last release: fix modular symbol scaling bug introduced in v20170815 checkgens now reads files including torsion points as in ecdata binder support (work in progress)
View article: Unique growth strategy in the Earth’s first trees revealed in silicified fossil trunks from China
Unique growth strategy in the Earth’s first trees revealed in silicified fossil trunks from China Open
Significance The evolution of trees and forests in the Mid–Late Devonian Period, 393–359 million years ago, profoundly transformed the terrestrial environment and atmosphere. The oldest fossil trees belong to the Cladoxylopsida. Their wate…
View article: Torsion points on elliptic curves over number fields of small degree
Torsion points on elliptic curves over number fields of small degree Open
We determine the set $S(d)$ of possible prime orders of $K$-rational points on elliptic curves over number fields $K$ of degree $d$, for $d = 4$, $5$, $6$, and $7$.
View article: eclib: bug fix
eclib: bug fix Open
Fixes a bug in mwrank relevant for curves with trivial 2-torsion and non-trivial Sha[2], as reported by William Stein and Jennifer Balakrishnan.
View article: Investigating<scp>D</scp>evonian trees as geo‐engineers of past climates: linking palaeosols to palaeobotany and experimental geobiology
Investigating<span>D</span>evonian trees as geo‐engineers of past climates: linking palaeosols to palaeobotany and experimental geobiology Open
We present the rationale for a cross‐disciplinary investigation addressing the ‘ D evonian plant hypothesis’ which proposes that the evolutionary appearance of trees with deep, complex rooting systems represents one of the major biotic fee…
View article: eclib: eclib-20150423
eclib: eclib-20150423 Open
The eclib package includes mwrank (for 2-descent on elliptic curves over Q) and modular symbol code used to create the elliptic curve database. It is a standard component of SageMath (http://www.sagemath.org/).