University of Rhode Island

About: University of Rhode Island is a education organization based out in Kingston, Rhode Island, United States. It is known for research contribution in the topics: Population & Bay. The organization has 11464 authors who have published 22770 publications receiving 841066 citations. The organization is also known as: URI & Rhode Island College of Agriculture and the Mechanic Arts.

Cyanophora paradoxa Genome Elucidates Origin of Photosynthesis in Algae and Plants

Abstract: The primary endosymbiotic origin of the plastid in eukaryotes more than 1 billion years ago led to the evolution of algae and plants. We analyzed draft genome and transcriptome data from the basally diverging alga Cyanophora paradoxa and provide evidence for a single origin of the primary plastid in the eukaryote supergroup Plantae. C. paradoxa retains ancestral features of starch biosynthesis, fermentation, and plastid protein translocation common to plants and algae but lacks typical eukaryotic light-harvesting complex proteins. Traces of an ancient link to parasites such as Chlamydiae were found in the genomes of C. paradoxa and other Plantae. Apparently, Chlamydia-like bacteria donated genes that allow export of photosynthate from the plastid and its polymerization into storage polysaccharide in the cytosol.

Product Aggregation, Market Integration, and Relationships between Prices: An Application to World Salmon Markets

Abstract: Relationships between prices of goods offer motives of interest in at least two areas: market integration and product aggregation. There is a close relationship between market integration and aggregation, which may increase the usefulness of market integration studies. In this article, these relationships are developed and illustrated by an application to the world salmon market. It is shown that the Law of One Price holds for an international market with five salmon species. This result has significant implications for the world salmon market regarding both product aggregation in demand analyses and international trade policy.

Generalized preisach model for hysteresis nonlinearity of piezoceramic actuators

Abstract: This paper presents a new approach for modeling the hysteresis nonlinearity of a piezoceramic actuator using a modified generalized Preisach model, and the use of this model in a linearizing control scheme. The developed generalized Preisach model relaxes the congruency requirement on the hysteresis loops of a piezoceramic actuator, which must be satisfied when using the classical Preisach model. The congruency property is experimentally proved to not hold when running the actuator on a minor hysteresis loop. A numerical expression of the model is derived in terms of first- and second-order reversal curve experimental datasets. Output prediction using this model is performed on both an exponentially decayed sinusoidal input signal and an arbitrary input signal, and the results show that the model can accurately reproduce the hysteresis response with an error of less than 2.7%. A tracking control system for a piezoceramic actuator is also developed by combining a PID feedback controller with a hysteresis linearizing scheme in a feed-forward loop. The results show that this new control system can achieve 0.25 μm tracking control accuracy, which is 80 and 50% less than that obtained when using an open-loop controller and a regular feedback control system, respectively.

Controlled-Release Drug Delivery Systems for Prolonged Gastric Residence: An Overview

Abstract: (1996). Controlled-Release Drug Delivery Systems for Prolonged Gastric Residence: An Overview. Drug Development and Industrial Pharmacy: Vol. 22, No. 6, pp. 531-539.