Simulations of the angular dependence of the dipole-dipole interaction among Rydberg atoms

The dipole-dipole interaction between two Rydberg atoms depends on the relative orientation of the atoms and on the change in the magnetic quantum number. We simulate the effect of this anisotropy on the energy transport in an amorphous many atom system subject to a homogeneous applied electric field. We consider two experimentally feasible geometries and find that the effects should be measurable in current generation imaging experiments. In both geometries atoms of $p$ character are localized to a small region of space which is immersed in a larger region that is filled with atoms of $s$ character. Energy transfer due to the dipole-dipole interaction can lead to a spread of $p$ character into the region initially occupied by $s$ atoms. Over long timescales the energy transport is confined to the volume near the border of the $p$ region which is suggestive of Anderson localization. We calculate a correlation length of 6.3~$\mu$m for one particular geometry.Comment: 6 pages, 5 figures, revised draf

Quantum control via a genetic algorithm of the field ionization pathway of a Rydberg electron

Quantum control of the pathway along which a Rydberg electron field ionizes is experimentally and computationally demonstrated. Selective field ionization is typically done with a slowly rising electric field pulse. The $(1/n^*)^4$ scaling of the classical ionization threshold leads to a rough mapping between arrival time of the electron signal and principal quantum number of the Rydberg electron. This is complicated by the many avoided level crossings that the electron must traverse on the way to ionization, which in general leads to broadening of the time-resolved field ionization signal. In order to control the ionization pathway, thus directing the signal to the desired arrival time, a perturbing electric field produced by an arbitrary waveform generator is added to a slowly rising electric field. A genetic algorithm evolves the perturbing field in an effort to achieve the target time-resolved field ionization signal.Comment: Corrected minor typographic errors and changed the titl

Randomized Algorithms for Approximating a Connected Dominating Set in Wireless Sensor Networks

A Connected Dominating Set (CDS) of a graph representing a Wireless Sensor Network can be used as a virtual backbone for routing through the network. Since the sensors in the network are constrained by limited battery life, we desire a minimal CDS for the network, a known NP-hard problem. In this paper we present three randomized algorithms for constructing a CDS. We evaluate our algorithms using simulations and compare them to the two-hop K2 algorithm and two other greedy algorithms from the literature. After pruning, the randomized algorithms construct a CDS that are generally equivalent in size to those constructed by K2 while being asymptotically better in time and message complexity. This shows the potential of significant energy savings in using a randomized approach as a result of the reduced complexity

The Ursinus Weekly, October 2, 1975

Meetings on Perkiomen Valley growth • In memoriam • Gene Shue presents: Year of the Sixers • City planner speaks • Ursinus College appoints Assoc. Prof. of Education • Kane earns Doctorate • Editorial: A different year? • Is there more to life? • New dorms renovated • Saturday Lunch • Forum series opens: Nina Deutsch • Musical notes • Chris Hillman rated • New events at Walnut • Nancy Drew revisited • Alumnus is named to Library post • British history specialist joins Ursinus faculty • Instructor returns to Ursinus • Pa. Dutch Program is success • Instructor appointed to Biology Dept. • Lindback Award presented • Soccer season opens • Ursinus allies with area • Balloons! • Ursinus named a \u2776er • Register now! • Grads elect officers • Yes we can gang didn\u27t • NFC forecast • MAC report • F & M stings Bears 35 - 21https://digitalcommons.ursinus.edu/weekly/1041/thumbnail.jp

The Ursinus Weekly, April 25, 1974

Jeane Dixon arrives at Ursinus College • Bruce Springsteen and band a big hit in Helfferich at first major rock music concert at Ursinus • Editorial staff named for Ursinus Weekly • Two more forums planned for April • IRC participates in Model UN • Committee meets on women’s hours • Editorial: Does anybody really care? • Jeane Dixon: Before it all happened • Union’s learn-ums: Mini-courses galore • Volunteers help special students • C. Vaughn Fitzgerald meets the challenge of London culture and energy crisis • Gutman speaks to Ec club • Freshman Mark Sellers new college chess champ • Travelin’ 7 benefits Pierce scholarship fund • The Zodiac: The water signs: Cancer, Scorpio, Pisces • Songfest slated for April 30 • Women’s Lacrosse hosts “all college” tri-outs • U.C. runs awayhttps://digitalcommons.ursinus.edu/weekly/1014/thumbnail.jp

Telegram From Philander C. Knox to Francis Mairs Huntington-Wilson, July 4, 1910

The document is a telegram from the Secretary of State to the Assistant Secretary of State regarding instructions for the Mexican Ambassador while the Secretary is ill.https://digitalcommons.ursinus.edu/fmhw_knox/1014/thumbnail.jp

Program for the Stage Production The Barrets of Wimpole Street

This eight-page program details the Curtain Club of Ursinus College’s production of The Barretts of Wimpole Street, held December 12 and 13, 1947 in Thompson-Gay Gymnasium. It includes information about the director, cast, production of the show, and a scene synopsis.https://digitalcommons.ursinus.edu/theater_programs/1004/thumbnail.jp

The Ursinus Weekly, March 4, 1963

Campus Chest drive begins with $2000 goal: Bitsy Lamberton and Bill Graver co-chairmen of Ursinus\u27 two-week appeal to aid 4 charities • Student opinion poll indicates need for extended library hours • Pi Nu initiates ten • Taxation to be topic of panel Wednesday • Sororities plan open parties for interested coeds • Sample student comments selected from Weekly \u27s library survey • 45 Meistersingers to go on tour • UC chapter of ICG to host region convention Saturday • Fullam & Swann elected to MSGA • Pre-medicals hear endocrine talk • Class representatives selected for 1963 Spring Festival court • Ash Wednesday service held by Y last week • Zucker to join choir in Carnegie concert • Final student concert to be given tonight • Mike Reed places in L&M contest • Editorial: Improving with time; Quite an education • Campus song Red, old gold & black written in 1899 by music director • Letters to the editor • Dry humor, awareness of life reflect Gustavson\u27s personality • Cagers end year with 90-84 win over Pharmacy • Drexel deals UC 24-7 mat defeat • Wrestlers cop 7th place in MACs; Dick Dean regains 147-pound title • Women cagers edge Stroudsburg • Intramural story • Greek gleaningshttps://digitalcommons.ursinus.edu/weekly/1289/thumbnail.jp

The Ursinus Weekly, January 8, 1962

Former Ursinusite, now Africa expert, to address Forum Wednesday night • Soc. classes hear prejudice speaker • Volunteer U.C. students pitch in at local Catholic boys\u27 protectory • Dr. Pancoast takes oath as mayor of Collegeville • President\u27s report reveals 1961 data, interesting facts • Fifty students attend open meeting; MSGA\u27s Moll airs campus problems • U.C. receives $2000 from Standard Oil • Delaware museum offers five grants • Day students tell Y of difficulties • Bill Scholl named to MAC first team • Eye surgery to be topic of next pre-med meeting • Singers choose Kershner 1962 business manager • Editorial: The right not to participate • Ursinus in the past • The New Lost City Ramblers at Haverford College • All Italian highways lead to Rome, the city of colorful contrasts • Twenty freshmen answer Weekly competition call • Cagers still seek win key; Losing streak at five games • Grapplers crunch Haverford, 31 to 3, in season\u27s opener • Freshman wrestler Fred Powers adds strength in the 157 lb. weight class • Ursinus again to host county science fairhttps://digitalcommons.ursinus.edu/weekly/1308/thumbnail.jp

The Ursinus Weekly, January 15, 1962

Shadowy figure of Ursinus\u27 past publishes volume of 66 poems • Dr. Snyder, Forum speaker, outlines seven strong forces in Africa today • Spontaneous fun object of new social committee • Prof casts critical eye over Lantern; Discovers sound creative instincts • Bursting water pipe sends Alumni Office to 620 Main • Student teachers\u27 light-hearted talk explains what\u27s not in the Ed. book • Best-dressed co-ed sought by Weekly • Shares of the pecuniary pie • Pre-medders hear about corneal transplant work • Editorial: Appeal of wrestling • Ursinus in the past • Letters to the editor • Obituary for a timid intellectual • Dryfoos sets two Ursinus cage marks; Dean ties record with quick pin • Pair of heartbreaking losses catch grapplers last week • Basketball begins • Frymen flounder; Lose to PMC, 92-80; Drop thriller to Swarthmore, 89 to 85 • Greek gleaningshttps://digitalcommons.ursinus.edu/weekly/1309/thumbnail.jp