Magnetoelectric Jones Dichroism in Atoms

The authors suggest that atomic experiments measuring the interference between magnetic-dipole and electric-field-induced electric-dipole transition amplitudes provide a valuable system to study magnetoelectric Jones effects.Comment: 3 pages, 2 figure

FirstLight: Pluggable Optical Interconnect Technologies for Polymeric Electro-Optical Printed Circuit Boards in Data Centers

The protocol data rate governing data storage devices will increase to over 12 Gb/s by 2013 thereby imposing unmanageable cost and performance burdens on future digital data storage systems. The resulting performance bottleneck can be substantially reduced by conveying high-speed data optically instead of electronically. A novel active pluggable 82.5 Gb/s aggregate bit rate optical connector technology, the design and fabrication of a compact electro-optical printed circuit board to meet exacting specifications, and a method for low cost, high precision, passive optical assembly are presented. A demonstration platform was constructed to assess the viability of embedded electro-optical midplane technology in such systems including the first ever demonstration of a pluggable active optical waveguide printed circuit board connector. High-speed optical data transfer at 10.3125 Gb/s was demonstrated through a complex polymer waveguide interconnect layer embedded into a 262 mm × 240 mm × 4.3 mm electro-optical midplane. Bit error rates of less than 10-12 and optical losses as low as 6 dB were demonstrated through nine multimode polymer wave guides with an aggregate data bandwidth of 92.8125 Gb/s

Quantum Vacuum Contribution to the Momentum of the Dielectric Media

Momentum transfer between matter and electromagnetic field is analyzed. The related equations of motion and conservation laws are derived using relativistic formalism. Their correspondence to various, at first sight self-contradicting, experimental data (the so called Abraham-Minkowski controversy) is demonstrated. A new, Casimir like, quantum phenomenon is predicted: contribution of vacuum fluctuations to the motion of dielectric liquids in crossed electric and magnetic fields. Velocities about $50nm/s$ can be expected due to the contribution of high frequency vacuum modes

Searching for gravitational waves from the Crab pulsar - the problem of timing noise

Of the current known pulsars, the Crab pulsar (B0531+21) is one of the most promising sources of gravitational waves. The relatively large timing noise of the Crab causes its phase evolution to depart from a simple spin-down model. This effect needs to be taken in to account when performing time domain searches for the Crab pulsar in order to avoid severely degrading the search efficiency. The Jodrell Bank Crab pulsar ephemeris is examined to see if it can be used for tracking the phase evolution of any gravitational wave signal from the pulsar, and we present a method of heterodyning the data that takes account of the phase wander. The possibility of obtaining physical information about the pulsar from comparisons of the electromagnetically and a gravitationally observed timing noise is discussed. Finally, additional problems caused by pulsar glitches are discussed.Comment: 5 pages, 1 figure, Proceedings of the 5th Amaldi Conference on Gravitational Waves, Pisa, Italy, 6-11 July 200

Photonic Quantum Logic with Narrowband Light from Single Atoms

Increasing control of single photons enables new applications of photonic quantum-enhanced technology and further experimental exploration of fundamental quantum phenomena. Here, we demonstrate quantum logic using narrow linewidth photons that are produced under nearly perfect quantum control from a single ^87Rb atom strongly coupled to a high-finesse cavity. We use a controlled- NOT gate integrated into a photonic chip to entangle these photons, and we observe non-classical correlations between events separated by periods exceeding the travel time across the chip by three orders of magnitude. This enables quantum technology that will use the properties of both narrowband single photon sources and integrated quantum photonics, such as networked quantum computing, narrow linewidth quantum enhanced sensing and atomic memories.Comment: 5 pates, 3 figure

Bridging the Gap: Addressing the Mental Health Needs of Underrepresented Collegiate Students at Psychology Training Clinics

Mental health treatment utilization on college campuses remains disproportionately low among underrepresented (UR) students (i.e., racial/ethnic minorities, first-generation college students, and students from low-income families). Additionally, UR students report that factors including stigma, long wait times, and costs are barriers to accessing treatment. Given these trends, new methods to bolster the utilization of counseling services among UR college students are needed. Concurrently, there is a call for psychology training programs to increase their efforts in preparing health service psychologists to work with culturally diverse populations including UR students. Psychology training clinics may be an additional resource on campuses that can be useful in meeting both of these needs. We present a program evaluation of 4-year partnership between a counseling psychology department training clinic and an academic division serving UR students at a large Midwestern university. Two quantitative metrics, including service utilization hours by UR students (2,020) and direct service hours accrued by clinical trainees (1,266), highlight the benefits of the partnership. A social justice framework and implications for training programs interested in developing similar partnerships are discussed. (PsycInfo Database Record (c) 2020 APA, all rights reserved

Investigation of an amide-pseudo amide hydrogen bonding motif within a series of theophylline:amide cocrystals

The pharmaceutically active compound theophylline (T) was cocrystallised with the amides formamide (1), acetamide (2), N-methylformamide (3), N,N-dimethylformamide (4), benzamide (5) and pyrazinamide (6), with systems T:1, T:5 and T:6 displaying polymorphic behaviour. The cocrystals with formamide (T:1), acetamide (T:2) and benzamide (T:5), and one polymorph of the cocrystal with pyrazinamide (T:6-I), contain an R22(9) hydrogen bonding motif between the amide cocrystal formers and the HN-C-C=O moiety of the theophylline molecule (an amide-pseudo amide synthon). This motif was, however, absent from the other polymorph of the pyrazinamide cocrystal (T:6-II), and also from the N-methylformamide cocrystal (T:3) (and is not possible in the N,N-dimethylformamide cocrystal (T:4)). These observations are rationalised using hydrogen bond propensity calculations, although limitations of using such calculations for predicting cocrystallisation are noted. The amide-pseudo amide synthon is favoured when theophylline cocrystallises with both primary amides and with secondary amides which are locked in a cis configuration. On heating, all cocrystals were found to dissociate before melting due to loss of the amide, making stability to dissociation a more meaningful measure of cocrystal stability than melting point for these systems. On dissociation of the cocrystals, theophylline typically crystallises as the commonly observed polymorph Form II. In the case of the acetamide cocrystal (T:2), however, the rarely observed metastable polymorph, Form V, crystallises concomitantly with Form II suggesting that cocrystal dissociation on heating could be a strategy for generating novel polymorphic forms of compounds

Effects of Bolus vs. Metered Rehydration Rates on Fluid Retention and Hydration Efficiency using 150% Fluid Replacement.

Effects of Bolus vs. Metered Rehydration Rates on Fluid Retention and Hydration Efficiency using 150% Fluid Replacement. Authors: Jared Graham (Masters), Tiffany Newcomb (Masters), Nathan Frischman (Undergraduate), Eric Jones (Ph D) Department of Kinesiology and Health Science Stephen F. Austin State University Nacogdoches TX. 75962 Purpose: This study assessed differences in urine production using bolus vs. metered ingestion fluid consumption during post-exercise rehydration. Methods: Using light to moderate activity in an environmentally controlled chamber (35°C), 9 male subjects were dehydrated by ~ 2% body weight. Following dehydration, counterbalanced rehydration trials (water) were performed in which two different methods of rehydrating; metered consumption (18.75% of total volume every 30mins for 4 hours) and bolus consumption (150% of total volume within 1 hour) were utilized. Urine production was evaluated and reported each hour during an eight-hour period following exercise to evaluate net fluid balance and hydration efficiency (fluid consumed vs. fluid retained). Results: Paired samples T-test revealed no significant differences (p=.94) between the two rehydration methods for hydration efficiency (bolus 41.5% vs. metered 42%) or net fluid balance (mean urine production: bolus 1347ml vs. metered 1337ml). Conclusions: Previous research using 100% fluid replacement (water) has revealed that metered consumption improves hydration efficiency and net fluid balance. However, the current findings suggest that any advantages gained through varying fluid consumption rates may be nullified by larger total rehydration volumes (150%)

Centaurus A: multiple outbursts or bursting bubble?

We present new radio observations of the brighter region of the northern lobe (the Northern Middle Lobe, NML) of Centaurus A obtained at 20 cm with the Australia Telescope Compact Array. The angular resolutions are ~50 and ~130 arcsec, therefore much higher than for the previously available radio images of this region. The most interesting feature detected is a large-scale jet that connects the inner radio lobe and the NML and that is imaged for the first time. The NML itself appears as diffuse emission with a relatively bright ridge on the eastern side. The radio morphology of Centaurus A and, in particular, its NML could be the result of a precessing jet that has undergone a strong interaction with the environment at least in the northern side. The very big drop in intensity between the inner jet and the large-scale jet can be explained with a sequence of bursts of activity at different epochs in the life of the source. Alternatively (or additionally) a ``bursting bubble'' model is proposed which could also explain the good collimation of the large-scale jet. In this model, the plasma accumulated in the inner lobe would be able to ``burst'' out only through one nozzle that would be the region where the large-scale jet forms. From the comparison between the radio emission and the regions of ionized gas we find that the inner optical filament falls about 2 arcmin (~2 kpc) away from the large-scale radio jet. Thus, this filament does not seem to have experienced a direct interaction with the radio plasma. The outer filaments appear to be, in projection, closer to the radio emission, arguing for a direct interaction with the radio jet. However, also in this case a more complicated interaction than assumed so far has to be occuring.Comment: To appear in MNRAS; 11 pages, LateX, 7 figures. Fig 1 is available at http://www.ira.bo.cnr.it/~rmorgant/Centaurus