Ultrasonic And Numerical Modeling Of Reflections From Simulated Fractured Reservoirs

Vve examine seismic waves scattered from anisotropic heterogeneity with laboratory data and numerical modeling in order to develop modeling techniques for the characterization of fracture properties in tight gas sands from surface seismic reflection data. Laboratory models representing features of a fractured reservoir were constructed using Phenolite (the "reservoir") embedded in a Lucite background, and seismic surveys were gathered over these models. In parallel with laboratory measurements, finite-difference modeling of reflections from a fractured medium were carried out. Fracture zone properties were calculated using an effective medium theory; the variation of fracture density produced a heterogeneous medium. The heterogeneity was modeled with a stochastic process, characterized by a probability density function and an auto-correlation function. Results from both modeling efforts show that prestacked AVO data can contain important information describing reservoir heterogeneity.United States. Dept. of Energy (Grant DEFG02-95ER82066)Massachusetts Institute of Technology. Earth Resources Laboratory. Reservoir Delineation Consortiu

Laserocarpum, a new genus of Apiaceae endemic to Greece

Laserpitium pseudomeum is an endemic umbellifer of Greece occurring in the mountains of Sterea Ellas and northern Peloponnese. Molecular data indicate that it is not related to its putative congeners, but instead constitutes an isolated lineage. The nuclear ribosomal DNA ITS tree places it as a weakly supported sister group to Portenschlagiella ramosissima, the sole species in its genus, whereas the tree inferred from three noncoding cpDNA loci does not confirm this relationship. Portenschlagiella ramosissima is sometimes placed in Athamanta, an affinity supported neither by molecular data nor by fruit morphology. Laserpitium pseudomeum notably differs from P. ramosissima in vegetative, flower, and fruit characteristics, and no obvious morphological synapomorphies indicate their close relationship. Therefore, we place L. pseudomeum in the newly described genus Laserocarpum and lectotypify the species with the specimen Orphanides 2019 (G00766460) at G-Boiss

Random Set Tracker Experiment on a Road Constrained Network with Resource Management

Abstract -This paper describes the application of finite set statistics (FISST) to real-time multiple target road constrained tracking problems. We studied specific test problems where multiple modality wireless sensor networks monitored road networks of interest. Acoustic and radar detections updated a global density that tracked the number and positions of targets. The global density determines "information states" that form the basis of a closed-loop Markov Decision Process resource management procedure that controls sensor operation