CSM-398 - Data Extraction from Web Data Sources

This paper provides an explanation of the basic data structures used in a new page analysis technique to create wrappers (data extractors) for the result pages produced by web sites in response to user qeries via web page forms. The key structure called a tpGrid is a representation of the web page, which is easier to analyse than the raw html code. The analysis looks for repetition patterns of sets of tagSets, which are defined in the paper

CSM-399 - Providing Robust Access to Data in Web Pages

Much useful e-commerce information is available on web pages, especially those created by queries to web servers. The problem for programs to use that information is how to ‘screen-scrape’ the data off the web page into machineusable data structures. Wrappers for web data sources use knowledge of the page layout in order to extract data accurately. So they fail if page format changes. This paper describes a fast method for wrapper production and also a method to automatically detect page format change, before it causes data access to fail. The method works for pages that contain collections of items, such as lists, tables and hierarchical structures. It uses a representation of html documents, which makes repetitive features apparent. This provides fully automatic wrapper production for a class of web pages, and rapid interactive production for others

F-Element Binolate Complexes: Control of Secondary Structure for Applications in Redox Chemistry, Complex Design, and Asymmetric Catalysis

Rare earth elements (REs; Sc, Y, La - Lu) are critical components to many current applications and technologies making the synthesis of molecular compounds with specific and tunable properties highly desirable. However, control of the coordination environment of REs can be challenging, due to the ionic nature of the metal-ligand bonds. Our studies have focused on the introduction of non-covalent interactions in the secondary coordination sphere of f-element BINOLate complexes, which enabled controlled f-element coordination environments in heterobimetallic and hydrogen-bonded frameworks. Reactivity and properties were tunable by interactions in the secondary coordination sphere, and had immediate applications to redox chemistry, coordination chemistry and asymmetric catalysis. Detailed spectroscopic and mechanistic studies were undertaken to understand the role of these interactions, and provide guiding design principles for future systems and applications

Concert recording 2019-01-25

[Track 1]. Down east ; [Track 2]. Two memories. A. Very pleasant ; B. Rather sad ; [Track 3]. Two little flowers (and dedicated to them) / Charles Ives -- [Track 4]. Ansturm ; [Track 5]. Bei dir ist es traut / Alma Mahler -- [Track 6]. Già il sole dal Gange / A. Scarlatti -- [Track 7]. Beautiful dreamer / Foster ; arranged by Penhorwood -- [Track 8]. Danza, danza, fanciulla / Durante -- [Track 9]. Ring, ring the banjo / Foster ; arranged by Penhorwood -- [Track 10]. Attente / Lilì Boulander -- [Track 11]. Among dawn flowers I ; Among dawn flowers II / Augusta Read Thomas -- [Track 12]. Reflets / Boulanger -- [Track 13]. His buttons are marked U.S. / Carrie Jacobs Bond -- [Track 14]. The ragtime pipe of Pan / Sigmund Romberg -- [Track 15]. The red rose rag / Percy Weinrich -- [Track 16]. I\u27ll be your baby vampire / Grace Doro -- [Track 17]. He\u27s a rag picker / Irving Berlin -- The maple leaf rag / Scott Joplin -- [Track 18]. A perfect day / Carrie Jacobs Bond -- [Track 19]. You\u27ve got to see mamma / Rose ; Conrad

ExaHDF5: Delivering Efficient Parallel I/O on Exascale Computing Systems

Scientific applications at exascale generate and analyze massive amounts of data. A critical requirement of these applications is the capability to access and manage this data efficiently on exascale systems. Parallel I/O, the key technology enables moving data between compute nodes and storage, faces monumental challenges from new applications, memory, and storage architectures considered in the designs of exascale systems. As the storage hierarchy is expanding to include node-local persistent memory, burst buffers, etc., as well as disk-based storage, data movement among these layers must be efficient. Parallel I/O libraries of the future should be capable of handling file sizes of many terabytes and beyond. In this paper, we describe new capabilities we have developed in Hierarchical Data Format version 5 (HDF5), the most popular parallel I/O library for scientific applications. HDF5 is one of the most used libraries at the leadership computing facilities for performing parallel I/O on existing HPC systems. The state-of-the-art features we describe include: Virtual Object Layer (VOL), Data Elevator, asynchronous I/O, full-featured single-writer and multiple-reader (Full SWMR), and parallel querying. In this paper, we introduce these features, their implementations, and the performance and feature benefits to applications and other libraries

Polarization-Current-Based FDTD Near-to-Far-Field Transformation

A new near-to-far-field transformation algorithm for three-dimensional finite-different time-domain is presented in this article. This new approach is based directly on the polarization current of the scatterer, not the scattered near fields. It therefore eliminates the numerical errors originating from the spatial offset of the E and H fields, inherent in the standard near-to-far-field transformation. The proposed method is validated via direct comparisons with the analytical Lorentz-Mie solutions of plane waves scattered by large dielectric and metallic spheres with strong forward-scattering lobes.Comment: 8 pages, 2 figures. Submitted to publis

Limits of the Stokes and Navier-Stokes equations in a punctured periodic domain

We treat three problems on a two-dimensional “punctured periodic domain”: we take Ωr=(−L,L)2∖rK, where r>0 and K is the closure of an open connected set that is star-shaped with respect to 0 and has a C1 boundary. We impose periodic boundary conditions on the boundary of Ω=(−L,L)2, and Dirichlet boundary conditions on ∂(rK). In this setting we consider the Poisson equation, the Stokes equations, and the time-dependent Navier–Stokes equations, all with a fixed forcing function f, and examine the behavior of solutions as r→0. In all three cases we show convergence of the solutions to those of the limiting problem, i.e. the problem posed on all of Ω with periodic boundary conditions

Scattering of Macroscopic Heterotic Strings

We show that macroscopic heterotic strings, formulated as strings which wind around a compact direction of finite but macroscopic extent, exhibit non-trivial scattering at low energies. This occurs at order velocity squared and may thus be described as geodesic motion on a moduli space with a non-trivial metric which we construct. Our result is in agreement with a direct calculation of the string scattering amplitude.Comment: 14 pp (harvmac l