A new and efficient approach to time-dependent density-functional perturbation theory for optical spectroscopy

Using a super-operator formulation of linearized time-dependent density-functional theory, the dynamical polarizability of a system of interacting electrons is given a matrix continued-fraction representation whose coefficients can be obtained from the non-symmetric block-Lanczos method. The resulting algorithm allows for the calculation of the {\em full spectrum} of a system with a computational workload which is only a few times larger than that needed for {\em static} polarizabilities within time-independent density-functional perturbation theory. The method is demonstrated with the calculation of the spectrum of benzene, and prospects for its application to the large-scale calculation of optical spectra are discussed.Comment: 4 pages, 2 figure

Density of states "width parity" effect in d-wave superconducting quantum wires

We calculate the density of states (DOS) in a clean mesoscopic d-wave superconducting quantum wire, i.e. a sample of infinite length but finite width $N$. For open boundary conditions, the DOS at zero energy is found to be zero if $N$ is even, and nonzero if $N$ is odd. At finite chemical potential, all chains are gapped but the qualtitative differences between even and odd $N$ remain.Comment: 7 pages, 8 figures, new figures and extended discussio

Predicting long-term outcome after acute ischemic stroke: a simple index works in patients from controlled clinical trials

Background and Purpose—An early and reliable prognosis for recovery in stroke patients is important for initiation of individual treatment and for informing patients and relatives. We recently developed and validated models for predicting survival and functional independence within 3 months after acute stroke, based on age and the National Institutes of Health Stroke Scale score assessed within 6 hours after stroke. Herein we demonstrate the applicability of our models in an independent sample of patients from controlled clinical trials. Methods—The prognostic models were used to predict survival and functional recovery in 5419 patients from the Virtual International Stroke Trials Archive (VISTA). Furthermore, we tried to improve the accuracy by adapting intercepts and estimating new model parameters. Results—The original models were able to correctly classify 70.4% (survival) and 72.9% (functional recovery) of patients. Because the prediction was slightly pessimistic for patients in the controlled trials, adapting the intercept improved the accuracy to 74.8% (survival) and 74.0% (functional recovery). Novel estimation of parameters, however, yielded no relevant further improvement. Conclusions—For acute ischemic stroke patients included in controlled trials, our easy-to-apply prognostic models based on age and National Institutes of Health Stroke Scale score correctly predicted survival and functional recovery after 3 months. Furthermore, a simple adaptation helps to adjust for a different prognosis and is recommended if a large data set is available. (Stroke. 2008;39:000-000.

The Ursinus Weekly, March 6, 1950

\u2751ers rate second place, capture trophy in contest • Sophs plan week-end of sophisticate decor • Senator to discuss many new issues facing law-makers • Helfferich ekes out heavyweight honor for second season • Scout frat sponsors heart disease drive with dorm workers • Bare, B. Keller win roles as adult duo in teen-age drama • Law students await Temple preliminary to April ICG parley • Vesper service ends emphasis week • Senators to launch soliciting campaign for Red Cross aid • Muench to conquer coed athlete ranks as minstrel emcee • Seniors to present Saurman\u27s musical • Southern exposure: Keller returns from the Mardi Gras • War brings German to Ursinus • Ursinus sage sees college past; hints at amazing future • Naturalists find Audubon • Specialists explain aspects of cancer from U.S. research • Druggists lose 75-47 as bears win fourth • Visitors sink coeds in tank meet 35-22 for fourth victory • Bearettes succumb 31-24 to undefeated Owl team • Leaders still pace intramural league; applications posted • Reilly leads Garnet five in 100-49 rout of bears • Cubs rally to beat Pharmacy juniors in 60-45 reversal • Belles knot contest at Southern College after yielding lead • Ursinus ties for fifth in MAC mat tourney • Bruin Quintet drops 58-51 court verdict in Jayvee skirmish • Bryn Mawr downs shuttlecock gals 5-0 • Tennis squad faces ten-match schedule • Juniors capitalize on campus freaks for initial 1951 Ruby budget activity • Thespians rehearse Gloria Mundi roles • Scout meeting to feature trip to Florida via slideshttps://digitalcommons.ursinus.edu/weekly/1586/thumbnail.jp

The Ursinus Weekly, May 1, 1950

Frosh, sophs, and Y offer varied weekend activities • General Synod to meet at Ursinus this summer • Expert to lecture here on Tuesday for IRC discussion • Curtain Club gives play this Tuesday; authored by Swan • Schmidt is chosen new Lantern editor • Women elect WAA and WSGA leaders • Eleven Y posts filled by YW-YM presidents • May Day play gets finishing touches • WSGA completes year with important activity • Y panel censures both scientist and layman • Dreschler elected pre-legal head • Gross chosen moderator • Tait to address pre-med society • Files reveal origin of May Day fetes • Y committee directs campus tours for visitors to Ursinus • Bomberger and Baxter are named head waiters • Future lawyers warned of poor job prospects • Munson speaks on law to pre-legal members • Alumni group to feast seniors at May dinner • Theater: Margetson in Clutterbuck • Six Ursinus track men compete in Penn relays • Tennis elucidated by Weekly writer; emphasizes scoring • Linksmen lose 9-0 to Blue Hen squad • Injury-riddled cindermen fall to diplomats 88-38 • Bears bow to Garnet 8-6 in eleven inning contest • \u27Ruby\u27 arrives this week; deficit faces senior class • Mattern to speak at vespershttps://digitalcommons.ursinus.edu/weekly/1591/thumbnail.jp

A Multi-Level Mathematical Model of the CO Catalytic Conversion Process

This paper presents a three-level modelling approach to the catalytic carbon monoxide oxidation in a temperature range between 400 K – 800 K. The first level involves the description of the chemical kinetics for the exothermic reactions on the catalyst surface. The second level models the thermal and hydrodynamic processes in the boundary diffusion layer between the catalyst surface and the reactive stream. Finally, the third modelling level focuses on the representation of the hydrodynamic and thermal properties for the bulk multi-component gas flow at various gas velocity and temperature ranges. The dynamic behaviour of the reactive system has been studied through simulated runs

The Ursinus Weekly, November 22, 1948

Radio broadcasting begun by students over station WURS • Racial prejudice poll completed by \u27CORE\u27 • Weekly staff grows to record size as cub reporters join • Y asks students to give toys for foreign Christmas • Med schools pick twenty-three for next year\u27s class • Uncle Harry set; cast full of talent • What do you consider an ideal weekend? • Crystal ball motif to be used for Senior Ball at Sunnybrook • Cub reporter suffers collapse; visualizes growth of Ursinus • Inscription creates frustration, defeat, malnutrition, scorn • Marsteller perfects apparatus for department of astronomy • Scarcity of squirrels is fall highlight • Belles notch fifth victory by downing Chestnut Hillers 7-1 • Ten gridders end college careers • Jay Vees trounce Chestnut Hill coeds • Seeders cuts squad to twenty-three; Veterans near peak as opener looms • Grizzlies bow to Staggs 13-0 ending season with 7 losses • Junior varsity due for \u2749 promotion as seven hockey stars leave in June • Last minute tally gives Diplomats 2-1 victory over bears • Belles drop second as Temple wins 3-1 • Music club offers 1st student recital • Pre-Meds observe microscopy exhibit at regular meeting • Ruby to hold Basket-Ball in gym featuring court game and dancehttps://digitalcommons.ursinus.edu/weekly/1602/thumbnail.jp