1 Institute for Computational & Mathematical Engineering, Stanford University, 475 Via Ortega, Stanford, CA 94306, USA 2 High Energy Accelerator Research Organization, KEK, 1-1 Oho, Tsukuba, Ibaraki, 305-0801, JAPAN SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata, ...

We examined the processes of calcite nucleation and crystal growth to determine the dominant mechanism for precipitation of calcite in the presence of dissolved organic carbon (DOC). Our experiments, conducted at 25°C and at a Ca:HCO, molar ratio of 1:2, were performed with and without calcite seeds. Scanning electron micrograph observations showed that the particle size of calcite crystals in ...

S. X.-L. Sun,1 A. P. Kaduwela,2,3 A. X. Gray,1,4,5 and C. S. Fadley1,4 1Department of Physics, University of California Davis, Davis, California 95616, USA 2Air Resources Board, California Environmental Protection Agency, Sacramento, California 95814, USA 3Department of Land, Air, and Water Resources, University of California Davis, Davis, California 95616, USA 4Materials Sciences Division, Law...

C. J. Jia,1,2 B. Moritz,1,3 C.-C. Chen,1,4 B. Sriram Shastry,5 and T. P. Devereaux1,6 1SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA 2Department of Applied Physics, Stanford University, California 94305, USA 3Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North ...

In India, family Bignoniaceae is represented by 21 genera and about 25 species including the non indigenous ornamental plants. The genera of Tecomella are a monotypic genus shrub/tree of the arid zone region in India. The natural stands of Tecomella undulata are restricted to the western parts and a few to southeastern parts of Pakistan. The species has been identified as an important for envir...

An increase in intracellular Ca2+ concentration ([Ca2+]) and morphological were simultaneously observed by epifluorescence and differential interference contrast (DIC) microscopy during fertilization of the sand dollar, Clypeaster japonicus. [Ca2+], which was detected by a Ca2+ indicator, Fluo-3, initially increased just beneath the sperm-attached site on the egg surface 8.6 sec after attachmen...

We summarize information concerning Recent and Pleistocene-Holocene Uruguayan sand dollars (Mellitidae), as well as Miocene taxa (Monophorasteridae). Recent and Pleistocene-Holocene species (Encope emarginata, Mellita quinquiesperforata, and Leodia sexisperforata) are at their southernmost limits of distribution, with only E. emarginata recorded further south than Uruguay. Lower temperatures to...

Many larvae and other plankton have complex and variable morphologies of unknown functional significance. We experimentally and theoretically investigated the functional consequences of the complex morphologies of larval sand dollars, Dendraster excentricus (Eschscholtz), for hydrodynamic interactions between swimming and turbulent water motion. Vertical shearing flows (horizontal gradients of ...

Optical and radiocarbon dating indicates that alluvium underlying dunes near Abilene was deposited at or before 45 ka, and that the overlying dunes were active at 1.1–0.5 ka. Geochemical data indicate that the Abilene dune sand is immature and was derived from the underlying Pleistocene alluvium, and not from Holocene age Smoky Hill River deposits. These findings suggest that dune activation wa...

2014 We discuss the problem of magnetic hysteresis in the framework of a model of a distribution of thermally activated double well potentials. Having shown the equivalence, at T = 0, of this description with the classical picture of Preisach and Néel we consider specifically the effects associated with the fact that the width of the distribution of the barrier-heights is necessarily finite. We...