Care of Nursery Stock in Retail Outlets

PDF pages: 1

Making the small oblique parameters large

We compute the oblique parameters, including the three new parameters $V$, $W$ and $X$ introduced recently by the Montreal group, for the case of one scalar multiplet of arbitrary weak isospin $J$ and weak hypercharge $Y$. We show that, when the masses of the heaviest and lightest components of the multiplet remain constant, but $J$ increases, the oblique parameter $U$ and the three new oblique parameters increase like $J^3$, while $T$ only increases like $J$. For large multiplets with masses not much higher than $m_Z$, the oblique parameters $U$ and $V$ may become much larger than $T$ and $S$.Comment: 9 pages, standard LATEX, 3 figures available from the authors, report CMU-HEP93-17 and DOE-ER/40682-4

Opening of an interface flaw in a layered elastic half-plane under compressive loading

A static analysis is given of the problem of an elastic layer perfectly bonded, except for a frictionless interface crack, to a dissimilar elastic half-plane. The free surface of the layer is loaded by a finite pressure distribution directly over the crack. The problem is formulated using the two dimensional linear elasticity equations. Using Fourier transforms, the governing equations are converted to a pair of coupled singular integral equations. The integral equations are reduced to a set of simultaneous algebraic equations by expanding the unknown functions in a series of Jacobi polynomials and then evaluating the singular Cauchy-type integrals. The resulting equations are found to be ill-conditioned and, consequently, are solved in the least-squares sense. Results from the analysis show that, under a normal pressure distribution on the free surface of the layer and depending on the combination of geometric and material parameters, the ends of the crack can open. The resulting stresses at the crack-tips are singular, implying that crack growth is possible. The extent of the opening and the crack-top stress intensity factors depend on the width of the pressure distribution zone, the layer thickness, and the relative material properties of the layer and half-plane

Cenomanian ammonites from Santander (Cantabria) and Sopeira (Aragón, southcentral Pyrenees), northern Spain

Ammonites del Cenomaniense de Santander (Cantabria) y de Sopeira (Aragón, Pirineos centro-meridionales), España septentrional. Se describen por primera vez ammonites del Cenomaniense superior (Cretácico) de los alrededores de Santander y de Sopeira (provincia de Huesca), España septentrional. Las siguientes especies están presentes: Tetragonites subtimotheanus Wiedmann, 1962, Calycoceras ( Newboldiceras) asiaticum asiaticum (Jimbo, 1894), Calycoceras ( Newboldiceras) planecostatum (Kossmat, 1897), Eucalycoceras pentagonum (Jukes-Browne, 1896), Eucalycoceras jeanneti Collignon, 1937 y Thomelites sornayi (Thomel, 1966). Esta asociación es típica de la parte inferior del Cenomaniense superior de la zona de Calycoceras (Proeucalycoceras) guerangeri a excepción de E. jeanneti, conocido solamente de Madagascar.Upper Cenomanian (Cretaceous) ammonites are described for the first time from the environs of Santander (Cantabria) and Sopeira (Aragón, Huesca province) in northern Spain. The following species are present: Tetragonites subtimotheanus Wiedmann, 1962, Calycoceras( Newboldiceras) asiaticum asiaticum(Jimbo, 1894), Calycoceras( Newboldiceras) planecostatum(Kossmat, 1897), Eucalycoceras pentagonum(Jukes-Browne,1896), Eucalycoceras jeannetiCollignon, 1937, and Thomelites sornayi(Thomel, 1966). This assemblage is typical of the lower Upper Cenomanian Calycoceras ( Proeucalycoceras) guerangeriZone, with the exception of E. jeanneti, previously known only from Madagascar.Ammonites del Cenomaniense de Santander (Cantabria) y de Sopeira (Aragón, Pirineos centro-meridionales), España septentrional. Se describen por primera vez ammonites del Cenomaniense superior (Cretácico) de los alrededores de Santander y de Sopeira (provincia de Huesca), España septentrional. Las siguientes especies están presentes: Tetragonites subtimotheanus Wiedmann, 1962, Calycoceras ( Newboldiceras) asiaticum asiaticum (Jimbo, 1894), Calycoceras ( Newboldiceras) planecostatum (Kossmat, 1897), Eucalycoceras pentagonum (Jukes-Browne, 1896), Eucalycoceras jeanneti Collignon, 1937 y Thomelites sornayi (Thomel, 1966). Esta asociación es típica de la parte inferior del Cenomaniense superior de la zona de Calycoceras (Proeucalycoceras) guerangeri a excepción de E. jeanneti, conocido solamente de Madagascar

Cenomanian ammonites from the condensed deposits of the Helvetic Domain (western Alps, France and Switzerland)

The Cenomanian ammonites of the Helvetic Domain (French-Swiss Western Alps) are revised and illustrated for the first time since the middle of the Nineteenth Century. The faunas occur in remarkable condensed hemipelagic glauconite-rich biomicrites that also contain planktic foraminifera and small stromatolites. Thirty-three ammonite species referred to 15 genera are described; the assemblage extends from the lower part of the Lower Cenomanian Mantelliceras mantelli Zone (Neostlingoceras carcitanense Subzone) to the lower part of the Middle Cenomanian Acanthoceras rhotomagense Zone (Turrilites costatus Subzone). The assemblage comprises 57 percent trachyostracous forms, 41 percent heteromorphs of the standard N.W. European sequence, and 2 percent leiostracous forms, which inhabited an external shelf biome. The biogeographic affinity of this fauna is essentially cosmopolitan (69 percent), but 31 percent of the specimens belong to the European Boreal biota, with no Tethyan tax