3,960,864 research outputs found
M. P. Walton letter
No full textThe collection contains a Civil War letter from M. P. Walton to his sister
Review of "Marvels of Medicine [:] Literature and Scientific Enquiry in Early Colonial Spanish America" by Patricia M. Garc��a.
No full textYar�� P��rez Mar��n. Marvels of Medicine [:] Literature and Scientific Enquiry in Early Colonial Spanish America. Liverpool: Liverpool University Press, 2020. XI + 181 pp. + 12 illus. ��90/$125. Review by Patricia M. Garc��a, The University of Texas at Austin
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
[Report to W. P. Gannaway by F. A. Hellinghausen and P. M. Parks, February 10, 1964 #2]
No full textCriminal intelligence report regarding an interview with Thomas M. and Natalie Ray. The Rays were friends of Lee Harvey Oswald and allowed him to stay at their home a few days prior to the assassination of President Kennedy. They stated that they first met Oswald at a party given at Mr. Declan Ford's home
[Report to W. P. Gannaway by F. A. Hellinghausen and P. M. Parks, February 10, 1964 #1]
No full textCriminal intelligence report regarding an interview with Thomas M. and Natalie Ray. The Rays were friends of Lee Harvey Oswald and allowed him to stay at their home a few days prior to the assassination of President Kennedy. They stated that they first met Oswald at a party given at Mr. Declan Ford's home
[Report to W. P. Gannaway by F. A. Hellinghausen and P. M. Parks, February 10, 1964 #3]
No full textCriminal intelligence report regarding an interview with Thomas M. and Natalie Ray. The Rays were friends of Lee Harvey Oswald and allowed him to stay at their home a few days prior to the assassination of President Kennedy. They stated that they first met Oswald at a party given at Mr. Declan Ford's home
Transition metal complexes for enantioselective catalysis of carbon-carbon, carbon-heteroatom, and carbon-hydrogen bond forming reactions
No full textIn some embodiments, the present disclosure pertains to a compound, comprising a transition metal complex having the formula ?-[M (x,y)-L1 (w,v)-L2 (t,u)-L3]p+An?mZ?p?m. In an embodiment of the present disclosure ? may be ?. In another embodiment ? may be ?. In some embodiments of the present disclosure, M is a transition metal. In a related embodiment, p is an integer corresponding to the oxidation state of M. In some embodiments of the present disclosure, each of x, y, w, v, t, and u independently comprise R. In other embodiments, each of x, y, w, v, t, and u independently comprise S. In an embodiment of the present disclosure, each of L1, L2, and L3 independently is a ligand comprising a substituted diamine. In some embodiments, An? comprises a lipophilic anion, where m is from 1 to 3, and where Z? comprises an optional second anion.U
Metal-metal multiply bonded complexes with metal-metal vector having orientational disorder
No full textVita.This dissertation presents detailed studies o f both trans and cis isom ers of W 2Cl4 (N H B ui)2 (PR 3 ) 2 (PR3 = PM e3, PM e2Ph, PEt3, PPr3). For trans PM e3 and P E t3 com pounds, low tem perature (less disordered) and room tem perature (more disordered) crystals were obtained. For trans PPr" and PM e2Ph com pounds, crystals obtained at low temperature and room temperature are the same. All trans com pounds undergo isomerization to cis isom ers in solution. Crystals of the cis isom er for PM e3 and PM e2Ph were obtained. The average W -P bond distances in the trans and the cis isom ers are 2.644(8) A and 2.52(1) A, respectively, and they are consistent with the ^ w -P coupling constants which are about 110 H z and 300 H z in the trans and cis isom ers, respectively. The short W -N distances in the m ore disordered crystals are not due to the presence o f a W -N triple bond, but are only apparent because the m etal-m etal orientational disorder is severe. The W -N bond distances in other trans and cis crystals are normal W -N double bond distances. The rate o f the trans to the cis isom erization is free phosphine dependent and a mechanism involving phosphine dissociation as the rate determining step is proposed. C ry stallizatio n at d ifferen t tem peratures affords d ifferen t cry stals for M 2Cl4 (PEt3)4 (M = Re, Mo, W ). Cubic crystals (space group I43m) were obtained at room tem perature for Re2Cl4 (PEt3)4 and M o2 Cl4 (PEt3)4 . W hen crystallization was carried out at -15 ��C, tetragonal crystals (space group I42m ) were form ed. The d iso rd er ratios change accordingly from equal distribution along three m utually perpendicular directions to one principal orientation along the c axis (4 axis), and two equally distributed m inor orientations along the a and b axes. For W 2 C l4 (PEt3>4 , crystals obtained at room temperature and -15 ��C are in the same space group I42m, but w ith different cell param eters and different disorder ratios. Once the crystals are formed, the disorder ratio will not change at room temperature
The long-wavelength view of GG Tau A: rocks in the ring world
No full textWe present the first detection of GG Tau A at centimetre wavelengths, made with the Arcminute Microkelvin Imager Large Array at a frequency of 16 GHz (λ = 1.8 cm). The source is detected at >6 σrms with an integrated flux density of S16GHz = 249 ± 45 µJy. We use these new centimetre-wave data, in conjunction with additional measurements compiled from the literature, to investigate the long-wavelength tail of the dust emission from this unusual protoplanetary system. We use an MCMC-based method to determine maximum likelihood parameters for a simple parametric spectral model and consider the opacity and mass of the dust contributing to the microwave emission. We derive a dust mass of Md ~ 0.1 Msun, constrain the dimensions of the emitting region and find that the opacity index at λ > 7 mm is less than unity, implying a contribution to the dust population from grains exceeding ~4 cm in size. We suggest that this indicates coagulation within the GG Tau A system has proceeded to the point where dust grains have grown to the size of small rocks with dimensions of a few centimetres. Considering the relatively young age of the GG Tau association in combination with the low derived disc mass, we suggest that this system may provide a useful test case for rapid core accretion planet formation models
[Report to W. P. Gannaway by P. M. Parks, February 11, 1964 #1]
No full textCriminal intelligence report addressed to Captain W. P. Gannaway of the Special Service Bureau. The report, which was submitted by P. M. Parks, presents a background check of Marlyne Moon. No results were uncovered
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