Solving the Schrödinger equation with use of 1/N perturbation theory

The large N expansion provides a powerful new tool for solving the Schrödinger equation. In this paper, we present simple recursion formulas which facilitate the calculation. We do some numerical calculations which illustrate the speed and accuracy of the technique

Genome Sequences of Poaceae-Associated Gemycirularviruses from the Pacific Ocean Island of Tonga

We sampled and analyzed 43 Poaceae plants from the Pacific Ocean island of Tonga for the presence of circular DNA viruses. From these samples, we recovered three gemycircularvirus genomes, which share >99% identity, from Brachiaria deflexa (n 2) and sugarcane (n 1). These genomes share<61% genome-wide identity with other gemycircularvirus sequences in public databases

Applications of patching to quadratic forms and central simple algebras

This paper provides applications of patching to quadratic forms and central simple algebras over function fields of curves over henselian valued fields. In particular, we use a patching approach to reprove and generalize a recent result of Parimala and Suresh on the u-invariant of p-adic function fields, for p odd. The strategy relies on a local-global principle for homogeneous spaces for rational algebraic groups, combined with local computations.Comment: 48 pages; connectivity now required in the definition of rational group; beginning of Section 4 reorganized; other minor change

Coordinated optimization of visual cortical maps (II) Numerical studies

It is an attractive hypothesis that the spatial structure of visual cortical architecture can be explained by the coordinated optimization of multiple visual cortical maps representing orientation preference (OP), ocular dominance (OD), spatial frequency, or direction preference. In part (I) of this study we defined a class of analytically tractable coordinated optimization models and solved representative examples in which a spatially complex organization of the orientation preference map is induced by inter-map interactions. We found that attractor solutions near symmetry breaking threshold predict a highly ordered map layout and require a substantial OD bias for OP pinwheel stabilization. Here we examine in numerical simulations whether such models exhibit biologically more realistic spatially irregular solutions at a finite distance from threshold and when transients towards attractor states are considered. We also examine whether model behavior qualitatively changes when the spatial periodicities of the two maps are detuned and when considering more than 2 feature dimensions. Our numerical results support the view that neither minimal energy states nor intermediate transient states of our coordinated optimization models successfully explain the spatially irregular architecture of the visual cortex. We discuss several alternative scenarios and additional factors that may improve the agreement between model solutions and biological observations.Comment: 55 pages, 11 figures. arXiv admin note: substantial text overlap with arXiv:1102.335

The Grizzly, February 4, 1991

Ursinus Celebrates Black History Month • Welcome Back President Richter • Noted Psychologist to Speak at Ursinus Forum • Kirstin Border Crowned • Sophomore Scholarship Competition Announced • Operation Ursinus Cares • Peace Activist Speaks • Veteran Leads Discussion • King Swamp • The Dark Half • Organ Recital • Fact vs. Fiction • Wrestlers Take It To the Mat • Football Players Honored at Banquet • Swimmers Drown E-town • Martin Scores 1,00th Career Point • Hoopsters Fall to Hopkins • Donald R. Groff Named New Softball Coach • Peace Movement Needs Agenda • Why we are at War: The Opinion of One Informed Layperson • Garbage: A Terrible Thing to Waste • Chemistry of the Gulf Warhttps://digitalcommons.ursinus.edu/grizzlynews/1269/thumbnail.jp

The Grizzly, February 11, 1991

Fraternity Pledging Returns Again • Wachtel Explains the Poverty of Affluence • The Changing War • Peer Educators and Community Service • Alumni Visit the Ballet • Study Abroad Memorable • A Valentine History • Side Winders • Dance Marathon • Get Shorty • Triumph of the Spirit • Gymnasts Fare Well at Ithaca, Reach Team Goal • Track Women Place Third at PAIAW Championships • Hoopsters Rounding Out Season • Fro Scores Point, Swimmers Wash Out Widener • Wrestlers Excel • Letters: Bring Becker Back; Praise From Florida; Oh no, Mr. Bill!; Respect Yourself and Your Major • War: A Personal Experience on the Homefront • Who Wants the Persian Gulf War? • The Mephisto of Calculus • This Spill No Mistakehttps://digitalcommons.ursinus.edu/grizzlynews/1270/thumbnail.jp

On-treatment comparison between corrective His bundle pacing and biventricular pacing for cardiac resynchronization: A secondary analysis of His-SYNC

Background The His-SYNC pilot trial was the first randomized comparison between His bundle pacing in lieu of a left ventricular lead for cardiac resynchronization therapy (His-CRT) and biventricular pacing (BiV-CRT), but was limited by high rates of crossover. Objective To evaluate the results of the His-SYNC pilot trial utilizing treatment-received (TR) and per-protocol (PP) analyses. Methods The His-SYNC pilot was a multicenter, prospective, single-blinded, randomized, controlled trial comparing His-CRT vs BiV-CRT in patients meeting standard indications for CRT (eg, NYHA II–IV patients with QRS >120 ms). Crossovers were required based on prespecified criteria. The primary endpoints analyzed included improvement in QRS duration, left ventricular ejection fraction (LVEF), and freedom from cardiovascular (CV) hospitalization and mortality. Results Among 41 patients enrolled (aged 64 ± 13 years, 38% female, LVEF 28%, QRS 168 ± 18 ms), 21 were randomized to His-CRT and 20 to BiV-CRT. Crossover occurred in 48% of His-CRT and 26% of BiV-CRT. The most common reason for crossover from His-CRT was inability to correct QRS owing to nonspecific intraventricular conduction delay (n = 5). Patients treated with His-CRT demonstrated greater QRS narrowing compared to BiV (125 ± 22 ms vs 164 ± 25 ms [TR], P < .001;124 ± 19 ms vs 162 ± 24 ms [PP], P < .001). A trend toward higher echocardiographic response was also observed (80 vs 57% [TR], P = .14; 91% vs 54% [PP], P = .078). No significant differences in CV hospitalization or mortality were observed. Conclusions Patients receiving His-CRT on-treatment demonstrated superior electrical resynchronization and a trend toward higher echocardiographic response than BiV-CRT. Larger prospective studies may be justifiable with refinements in patient selection and implantation techniques to minimize crossovers

The Grizzly, March 19, 1991

New U.S.G.A Officers Appointed • Pennsylvania Pro-Life Convention Held • Rare Israeli Exhibition Arrives Safely • Village Idiots Compete at Pitt • Tenure Candidates Approved for Next Year • Alcohol Recovery Group to Start • Seniors Prepare for Graduation • Just Do It -- The Nautilus Connection • Flags: The Collegeville Connection • U.S.G.A Minutes • The Knack is Bnack! • Ursinus Students in Indonesia for a Day • Julian\u27s House • Meistersingers • Talking With Betty Boop • Bowie: Something Old and Something New • City of David at Berman • Men\u27s Lacrosse Club Wins Season Opener • Tennis Teams Begin Season • Five Named to MAC Honor Roll • Softball Starts Season • Baseball World Tour \u2791 • Indoor Track Finishes Season • Letter: On Teaching Catalan • Student Apathy is Growing • Consider Women\u27s Studies Next Semesterhttps://digitalcommons.ursinus.edu/grizzlynews/1273/thumbnail.jp

Managed Aquifer Recharge as a Tool to Enhance Sustainable Groundwater Management in California

A growing population and an increased demand for water resources have resulted in a global trend of groundwater depletion. Arid and semi-arid climates are particularly susceptible, often relying on groundwater to support large population centers or irrigated agriculture in the absence of sufficient surface water resources. In an effort to increase the security of groundwater resources, managed aquifer recharge (MAR) programs have been developed and implemented globally. MAR is the approach of intentionally harvesting and infiltrating water to recharge depleted aquifer storage. California is a prime example of this growing problem, with three cities that have over a million residents and an agricultural industry that was valued at 47 billion dollars in 2015. The present-day groundwater overdraft of over 100 km3 (since 1962) indicates a clear disparity between surface water supply and water demand within the state. In the face of groundwater overdraft and the anticipated effects of climate change, many new MAR projects are being constructed or investigated throughout California, adding to those that have existed for decades. Some common MAR types utilized in California include injection wells, infiltration basins (also known as spreading basins, percolation basins, or recharge basins), and low-impact development. An emerging MAR type that is actively being investigated is the winter flooding of agricultural fields using existing irrigation infrastructure and excess surface water resources, known as agricultural MAR. California therefore provides an excellent case study to look at the historical use and performance of MAR, ongoing and emerging challenges, novel MAR applications, and the potential for expansion of MAR. Effective MAR projects are an essential tool for increasing groundwater security, both in California and on a global scale. This chapter aims to provide an overview of the most common MAR types and applications within the State of California and neighboring semi-arid regions

The Grizzly, October 16, 1990

Olin Walkway Changes the Face of Ursinus • Congressional Candidate Lewis Du Pont Smith Spurs Debate • The Minority Student Union: A Step Toward Diversity • USEAC Conference Bolsters Environmental Activism • Father Changes • Reflecting on Rosen • New Hang-out • The Replacements • Upcoming Berman • Cross Country Runs On • Soccer Wins Two • Netters Upset • Hockey Splits • Grubb Predicts Again • Football Refuses To Give Up • Letters: Complain, but Don\u27t Steal; Positive Pledging; Wismer Food: Quick Service and Healthy Variety • A Contradiction in American Beliefs • This is America? • A Spectacular Devicehttps://digitalcommons.ursinus.edu/grizzlynews/1261/thumbnail.jp