Review of \u3cem\u3eChallenges of Urban Education: Sociological Perspectives for the Next Century.\u3c/em\u3e Karen A. McClafferty, Carlos Alberto Torres and Theodor R. Mitchell (Eds.). Reviewed by Chad Ellett

Book review of Karen A. McClafferty, Carlos Alberto Torres and Theodor R. Mitchell (Eds.), Challenges of Urban Education: Sociological Perspectives for the Next Century. Albany, N.Y.: State University of New York Press, 2000. $19.95 papercover

A comparison of conjunctival bacteria in contact lens wearers and noncontact lens wearers

The lower conjunctival fornix of 241 contact lens wearers and nonwearers were sampled then cultured to determine the presence or lack of bateria. Several other factors were also investigated: the duration of contact lens wear, the hours/day of wear, the type or types of solutions used, lens hygiene, the age, and the sex of the subjects. A Chi Squared Test was used as the criteria of difference. The incidence of bacteria for contact lens wearers did not differ from nonwearers. Incidence was not influenced by any of the other factors either

Angular Distribution of the Protons from the Deuteron - Deuteron Reaction

A collimated beam of deuterons, of accurately controlled energy, has been directed into a chamber filled with deuterium gas at a pressure of 0.5 mm. of Mercury. High Energy protons are produced in the well-known nuclear reaction: H2+H2→H1+H3. The number of such protons ejected per unit solid angle from disintegrations occurring in a selected volume has been measured as a function of angle with the incident beam. For a bombarding energy of 325 kilovolts we find the angular distribution to be represented by 1 + 1.35 cos2 ϑ, where ϑ is the angle with the beam as assigned by an observer at rest with respect to the center of mass of the colliding deuterons. The theoretical significance of the result will be discussed. Data for 250 and 400 kilovolts should also be available for presentation at the meeting

High Voltage Apparatus for Nuclear Physics

The design and performance of a transformer-rectifier voltage quadrupling installation for potentials up to 600 KV will be described

Surface salinity of the North Atlantic : can we reconstruct its fluctuations over the last one hundred years ?

Surface samples have been collected in the North Atlantic in the past one hundred years for determining the ocean salinity and its temperature. A large share of the data we have used were collected by merchant vessels of weather ships of European countries and to a large extent are listed in reports, in particular in the "Bulletin Hydrographique". We investigate whether these data are relevant for determining low frequency fluctuations of the sea surface salinity. We find many crossing in the 1920s for which salinity is anomalously high compared with the climatology or with other crossings collected on the same ship line. These anomalies are indicative of a contamination of the sample. By examining hydrographic data, reports and recent experience in collectionand storage in sea water, we can attribute these large errors to unclean buckets where salt crystals dissolve into the sample and to breathing of the samples during the storage. Each of these stages contributes in estimating a too large salinity and adds to the scatter of the measurements. (D'après résumé d'auteur

Quantum Simulations on a Quantum Computer

We present a general scheme for performing a simulation of the dynamics of one quantum system using another. This scheme is used to experimentally simulate the dynamics of truncated quantum harmonic and anharmonic oscillators using nuclear magnetic resonance. We believe this to be the first explicit physical realization of such a simulation.Comment: 4 pages, 2 figures (\documentstyle[prl,aps,epsfig,amscd]{revtex}); to appear in Phys. Rev. Let

Comparing Bedside Methods of Determining Placement of Gastric Tubes in Children

Purpose The purpose of this study was to compare the accuracy and predictive validity of pH, bilirubin, and CO2 in identifying gastric tube placement errors in children. Design and Methods After the tube was inserted into 276 children, the CO2 monitor reading was obtained. Fluid was then aspirated to test pH and bilirubin. Results Lack of ability to obtain tube aspirate was the best predictor of NG/OG placement errors with a sensitivity of 34.9% and a positive predictive value of 66.7%. Measuring pH, bilirubin, and CO2 of tube aspirate was less helpful. Practice Implications Health care providers should suspect NG/OG tube misplacement when no fluid is aspirated

Pseudorapidity Distribution of Charged Particles in PbarP Collisions at root(s)= 630GeV

Using a silicon vertex detector, we measure the charged particle pseudorapidity distribution over the range 1.5 to 5.5 using data collected from PbarP collisions at root s = 630 GeV. With a data sample of 3 million events, we deduce a result with an overall normalization uncertainty of 5%, and typical bin to bin errors of a few percent. We compare our result to the measurement of UA5, and the distribution generated by the Lund Monte Carlo with default settings. This is only the second measurement at this level of precision, and only the second measurement for pseudorapidity greater than 3.Comment: 9 pages, 5 figures, LaTeX format. For ps file see http://hep1.physics.wayne.edu/harr/harr.html Submitted to Physics Letters

Magnetic Resonance

Contains reports on one research project.Joint Services Electronics Programs (U. S. Army, U. S. Navy, and U. S. Air Force) under Contract DA 28-043-AMC-02536(E