2,621 research outputs found
Patterson, Joseph (Death, 1899-01-02)
No full textAddress: United StatesAge at death: 59 yrs.Pg 2/1899/57/M N M/City Infirmary/City Infirmary/Dr. Thos. P. Hart/J. Habig & Sons/U. Baptist Cem.Original record filed in drawer labeled 'PATTERSON,F-PECK'
The evolution of cataclysmic variables as revealed by their donor stars
No full textWe present an attempt to reconstruct the complete evolutionary path followed by cataclysmic variables (CVs), based on the observed mass-radius relationship of their donor stars. Along the way, we update the semi-empirical CV donor sequence presented previously by one of us, present a comprehensive review of the connection between CV evolution and the secondary stars in these systems, and reexamine most of the commonly used magnetic braking (MB) recipes, finding that even conceptually similar ones can differ greatly in both magnitude and functional form. The great advantage of using donor radii to infer mass-transfer and angular-momentum-loss (AML) rates is that they sample the longest accessible timescales and are most likely to represent the true secular (evolutionary average) rates. We show explicitly that if CVs exhibit long-term mass-transfer-rate fluctuations, as is often assumed, the expected variability timescales are so long that other tracers of the mass-transfer rate—including white dwarf (WD) temperatures—become unreliable. We carefully explore how much of the radius difference between CV donors and models of isolated main-sequence stars may be due to mechanisms other than mass loss. The tidal and rotational deformation of Roche-lobe-filling stars produces sime 4.5% radius inflation below the period gap and sime 7.9% above. A comparison of stellar models to mass-radius data for non-interacting stars suggests a real offset of sime 1.5% for fully convective stars (i.e., donors below the gap) and sime 4.9% for partially radiative ones (donors above the gap). We also show that donor bloating due to irradiation is probably smaller than, and at most comparable to, these effects. After calibrating our models to account for these issues, we fit self-consistent evolution sequences to our compilation of donor masses and radii. In the standard model of CV evolution, AMLs below the period gap are assumed to be driven solely by gravitational radiation (GR), while AMLs above the gap are usually described by an MB law first suggested by Rappaport et al. We adopt simple scaled versions of these AML recipes and find that these are able to match the data quite well. The optimal scaling factors turn out to be f GR = 2.47 ± 0.22 below the gap and f MB = 0.66 ± 0.05 above (the errors here are purely statistical, and the standard model corresponds to f GR = f MB = 1). This revised model describes the mass-radius data significantly better than the standard model. Some of the most important implications and applications of our results are as follows. (1) The revised evolution sequence yields correct locations for the minimum period and the upper edge of the period gap; the standard sequence does not. (2) The observed spectral types of CV donors are compatible with both standard and revised models. (3) A direct comparison of predicted and observed WD temperatures suggests an even higher value for f GR, but this comparison is sensitive to the assumed mean WD mass and the possible existence of mass-transfer-rate fluctuations. (4) The predicted absolute magnitudes of donor stars in the near-infrared form a lower envelope around the observed absolute magnitudes for systems with parallax distances. This is true for all of our sequences, so any of them can be used to set firm lower limits on (or obtain rough estimates of) the distances toward CVs based only on P orb and single epoch near-IR measurements. (5) Both standard and revised sequences predict that short-period CVs should be susceptible to dwarf nova (DN) eruptions, consistent with observations. However, both sequences also predict that the fraction of DNe among long-period CVs should decline with P orb above the period gap. Observations suggest the opposite behavior, and we discuss the possible explanations for this discrepancy. (6) Approximate orbital period distributions constructed from our evolution sequences suggest that the ratio of long-period CVs to short-period, pre-bounce CVs is about 3 × higher for the revised sequence than the standard one. This may resolve a long-standing problem in CV evolution. Tables describing our donor and evolution sequences are provided in electronically readable form
Evidence for erbium-erbium energy migration in erbium(III) bis(perfluoro-p-tolyl)phosphinate
No full textCopyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Applied Physics Letters 92, 103303 (2008) and may be found at
Patterson functions of the type I and II collagen 00L (meridional) series.
No full text<p>A) Patterson function from 0.0–0.5D, the inverse (0.5–1.0) half of the Patterson function is not shown. The fractional distances between periodicities indicated in the functions has been multiplied by 67 nm (the length of the one dimensional unit cell – the D-period) for comparison with the helix symmetry periods. B) Enhanced view of the Patterson function range of interest for the helix symmetry periodicities. C) Table of key helix periodicities for comparison with A and B (see also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0089519#pone-0089519-g004" target="_blank">Figure 4</a>).</p
A fruitful bough : the Old Testament story of Joseph in medieval and Golden Age Spanish literature
No full texttextThe Old Testament story of Joseph is common to the Christians, Muslims, and Jews of medieval Spain, and each group drew upon its own and other exegetical traditions to produce literary versions of the biblical tale. After the expulsion of the latter two groups, several Hispanic playwrights, including such notable figures as Lope de Vega, Pedro Calderón de la Barca, and Sor Juana Inés de la Cruz, continued to produce theatrical versions of the Josephine legend throughout the Golden Age. Most of these plays attained a great deal of popularity. In spite of the importance of these works in early Spanish culture, recent scholarship has paid comparatively little attention to them. The present study is meant to remedy that situation. By drawing upon the theoretical concepts of Edward Said, Amin Maalouf, Jonathan Z. Smith, and others regarding identity and Otherness, I demonstrate how each adaptation of the story constructs or evaluates religious and national identity. Medieval prose and poetic adaptations written by representatives of each of the three monotheistic faiths reveal an attempt to maintain the boundaries of religious identity within a multicultural context. Sixteenth-century theatrical versions deal with the post-expulsion identity crisis by proposing a more inclusive attitude towards New Christians. Finally, under the Baroque influence of the late seventeenth century, adaptations of the Joseph story become increasingly metatheatrical. This literary self-reflection serves to interrogate the nature of identity and reveal its constructedness. Given the importance of identity issues in current scholarship, this analysis suggests the need for increased critical attention to be paid to the Spanish Josephine tradition.Spanish and Portugues
Buying a computer for your farm or ranch
No full textBulletin no. 758 Moscow, Idaho :University of Idaho, College of Agriculture, Cooperative Extension System, 1994-06-01. Author(s): Patterson, P. E.; Gray, C. W.; Davis, A
The effects of very early Alzheimer's disease on the characteristics of writing by a renowned author
No full textIris Murdoch (I.M.) was among the most celebrated British writers of the post-war era. Her final novel, however, received a less than enthusiastic critical response on its publication in 1995. Not long afterwards, I.M. began to show signs of insidious cognitive decline, and received a diagnosis of Alzheimer's disease, which was confirmed histologically after her death in 1999. Anecdotal evidence, as well as the natural history of the condition, would suggest that the changes of Alzheimer's disease were already established in I.M. while she was writing her final work. The end product was unlikely, however, to have been influenced by the compensatory use of dictionaries or thesauri, let alone by later editorial interference. These facts present a unique opportunity to examine the effects of the early stages of Alzheimer's disease on spontaneous written output from an individual with exceptional expertise in this area. Techniques of automated textual analysis were used to obtain detailed comparisons among three of her novels: her first published work, a work written during the prime of her creative life and the final novel. Whilst there were few disparities at the levels of overall structure and syntax, measures of lexical diversity and the lexical characteristics of these three texts varied markedly and in a consistent fashion. This unique set of findings is discussed in the context of the debate as to whether syntax and semantics decline separately or in parallel in patients with Alzheimer's disease
Patterson functions of collagen model structure factors 00L (meridional) series.
No full text<p>A) Comparison of GPO (7/2 model) and GPO with collagen sequence threaded to check if amino acid sequence effects periodicities detected by the Patterson function. It does not appear so. B) As (A) except for GAA (10/3 model). C) Patterson functions of collagen types I and II are compared with those from the GAA and GPO coordinate models with the collagen sequence threaded onto them. The semi-transparent arrows mark: red, the maximum of the GAA (10/3) helix model pitch and repeat periods, the black arrows mark the collagen I and II respective positions for these periods. Note that the collagen experimental data show periods that are longer then the 7/2 and do seem to almost reach the 10/3 expected range. This could be interpreted to mean that both helical symmetries are found in native fibrillar collagen in addition to other possible conformations.</p
Patterson function periodicities and correlation between observed and ‘perfect’ helical symmetry periodicities (see also Figure 5).
No full text<p>Patterson function periodicities and correlation between observed and ‘perfect’ helical symmetry periodicities (see also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0089519#pone-0089519-g005" target="_blank">Figure 5</a>).</p
Decoding the evolution and dynamics of semicrystalline block copolymer assembly via liquid-phase transmission electron microscopy
No full textNature utilizes self-assembly to form complex, functional structures, inspiring advanced materials design. Polymer crystallization drives assemblies with both ordered and disordered regions. Crystallization-driven assembly of BCPs enables unique hierarchical nanostructures with enhanced colloidal stability and directionality, applicable from optoelectronics to biomedicine. However, mechanisms governing morphological transitions remain poorly understood due to complex microphase separation and competitive crystallization. Using liquid-phase transmission electron microscopy, we visualize the spontaneous assembly of semicrystalline amphiphilic BCPs. We observe structural transformations from unimers to spherical, cylindrical, toroidal micelles, and vesicles by varying constituent block ratios. Image segmentation overcomes low contrast of aqueous assemblies, enabling motion tracking. Nanostructures exhibit structural evolution driven by long-range hydrophobic interactions from formed elemental micelles undergoing anomalous diffusion. Notably, toroid formation follows a distinct pathway compared with conventional BCPs due to semicrystalline BCPs' preference for low curvature at the core-corona interface. Insights into assembly dynamics via real-time imaging provide strategies for controlling complex hierarchical structures.
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