A Genealogy

We are talking about who looks like who again (although he looks most like me and I am nobody\u27s mother yet) and why this is a compelling argument in one child\u27s favor. ~excerpt from poe

A model study of acoustic reflection from a rippled water-sand interface

A model experiment was performed to measure acoustic reflection from a rippled sand surface using a pulse-echo system employing electrostatic transducers over the frequency range 100-350 kHz. The ripple wavelength of 1.23 cm was slightly greater than the longest acoustic wavelength and had an amplitude to wavelength ratio of 1/10. Boiling of the sand to remove entrapped air was essential before the scattering effects of the ripples could be observed. The angles of propagation of the scattered spectra are found to agree with the theoretical prediction within + 2°. The amplitudes of two orders of the scattered spectrum were measured at an incident angle of 45° and compared to the theory for the limiting condition where the ripple wavelength is very much larger than the acoustic wavelength. Agreement was excellent for the spectral reflection, but was not as good for the first order reflection.http://www.archive.org/details/modelstudyofacou00arcuLieutenant Commander, United States Nav

Distortion of He emission lines after fast-ion collisions

After excitation by fast ions (velocity = 2 to 5 au) the emission line profiles of doubly-excited helium atoms are observed to differ significantly from the normal shape of Beutler-Fano resonances. This difference is attributed to the Coulomb interaction between the emitted electron and the ion used to excite the atom. We explain the effect quantitatively with a simple classical model combined with a post-collision-interaction theory. 4 refs., 4 figs

DETERMINATION OF THE (0, 1) - (0, 3) ROTATIONAL SPLITTING OF H2+H_{2}{^{+}} FROM MICROWAVE SPECTROSCOPY OF H2H_{2} RYDBERG STATES.∗STATES.^{\ast}

$^{\ast}$Supported by NSF under Grant PHY-87-09707 $^{1}$L. Wolniewicz and J.D. Poll, Mol. Phys. 59, 953 (1986)Author Institution: Dept. of Physics, Univ. of Notre DameThe 1-3 rotational splitting of the ground vibrational state of $H_{2}^{+}$ has been $calculated^{1}$ to be $288.861(1) cm^{-1}$. As a consequence, the (0, 1)28L and (1, 3)16L Rydberg states of $H_{2}$ are separated in energy by only about 7 GHz. Electric dipole transitions between the two series, which would normally be forbidden, are weakly allowed by virtue of mixing between the two series. This allows a direct determination of the energy difference between states of the two series by microwave spectroscopy, from which the core rotational splitting may be inferred with high precision. Preliminary results of such a determination based on observation of the $(0, 1)28H_{6} - (0, 3)161_{7}$ transition, and other similar transitions will be described

The effects of intranasal oxytocin in opioid-dependent individuals and healthy control subjects: a pilot study.

RationaleThere has been an explosion of research on the potential benefits of the social neuropeptide oxytocin for a number of mental disorders including substance use disorders. Recent evidence suggests that intranasal oxytocin has both direct anti-addiction effects and pro-social effects that may facilitate engagement in psychosocial treatment for substance use disorders.ObjectivesWe aimed to assess the tolerability of intranasal oxytocin and its effects on heroin craving, implicit association with heroin and social perceptual ability in opioid-dependent patients receiving opioid replacement therapy (ORT) and healthy control participants.MethodsWe performed a randomized, double-blind, placebo-controlled, within- and between-subjects, crossover, proof-of-concept trial to examine the effects of oxytocin (40 international units) on a cue-induced craving task (ORT patients only), an Implicit Association Task (IAT), and two social perception tasks: the Reading the Mind in the Eyes Task (RMET) and The Awareness of Social Inference Test (TASIT).ResultsOxytocin was well tolerated by patients receiving ORT but had no significant effects on craving or IAT scores. There was a significant reduction in RMET performance after oxytocin administration versus placebo in the patient group only, and a significant reduction in TASIT performance after oxytocin in both the patient and healthy control groups.ConclusionsA single dose of intranasal oxytocin is well tolerated by patients receiving ORT, paving the way for future investigations. Despite no significant improvement in craving or IAT scores after a single dose of oxytocin and some evidence that social perception was worsened, further investigation is required to determine the role oxytocin may play in the treatment of opioid use disorder.Clinical trial registrationMethadone Oxytocin Option. ClinicalTrials.gov identifier: NCT01728909