نتایج جستجو برای: deltas
تعداد نتایج: 1272 فیلتر نتایج به سال:
This paper addresses maintenance of materialized views in a warehousing environment, where views reside on a remote database. We analyze so called Change Data Capture techniques used to capture changes (also referred to as deltas) at the source systems. We show that many existing CDC techniques do not provide complete deltas but rather incomplete (or partial) deltas. Traditional view maintenanc...
Coastal deltas are landforms that typically offer a wide variety of benefits to society including highly fertile soils for agricultural development, freshwater resources, and rich biodiversity. For these reasons, many deltas are densely populated, are important economic hubs, and have been transformed by human interventions such as agricultural intensification, modification of water and sedimen...
This paper presents an empirical test of Dupire's (1993) option price inversion approach using FT–SE 100 index options. The performance of option deltas determined using the Dupire approach is compared to the performance of a pair of Black-Scholes (1973) based deltas. The study finds that Black-Scholes based deltas out-perform the Dupire-deltas, which is consistent with the results in synthesiz...
The Heraclitus languages are database programming languages that give prominence to \delayed updates" or deltas, which are rst-class values representing sets of proposed updates, such as inserts and deletes, to the underlying persistent store. Deltas can be created, inspected and combined without committing to the given updates. Deltas are useful for realizing advanced database features that ma...
In diesem Beitrag werden Konzepte zur Erweiterung eines mehrperspektivischen Meta-Modells (am Beispiel des SPES Meta-Modells) um Aspekte der Variabilitätsmodellierung durch das Konzept der Delta-Modellierung vorgestellt. Die Konzepte werden exemplarisch anhand der logischen und der funktionalen Perspektive des SPES Meta-Modells illustriert. Die vorgestellten Konzepte können ohne Weiteres auch a...
This study investigates the influence of the solid-state properties melting point (T(m)), enthalpy of melting (DeltaH(m)) and entropy of melting (DeltaS(m)) of a drug on its intrinsic solubility (S(0)). For this purpose, 26 chemically and structurally diverse drugs covering the oral drug space were selected and the S(0), T(m), DeltaH(m) and DeltaS(m) were determined experimentally. The influenc...
Deltas contain complex self-organizing channel networks that nourish the surface with sediment and nutrients. Developing a quantitative understanding of how controlling physical mechanisms of delta formation relate to the channel networks they imprint on the landscape remains an open problem, hindering further progress on quantitative delta classification and understanding process from form. He...
Deltaic systems are among the most dynamic and productive environments on Earth and many have a high population density. Deltas play a central role in food and water security but are increasingly facing hazards such as submergence, riverine and coastal flooding, and coastal erosion. This paper synthesizes efforts of the Belmont Forum Deltas project, an international network of interdisciplinary...
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