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Institution

University of Rhode Island

EducationKingston, Rhode Island, United States
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.


Papers
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Journal ArticleDOI
TL;DR: Occurrence of secondary metabolites in microalgae (protoctista) is discussed with respect to the phylogenic or taxonomic relationships of organisms.
Abstract: Occurrence of secondary metabolites in microalgae (protoctista) is discussed with respect to the phylogenic or taxonomic relationships of organisms. Biosynthetic mechanisms of certain metabolites such as paralytic shellfish poisoning toxins and polyether toxins are also discussed, and genetic aspects of the secondary metabolite production as well.

229 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed surface electrical resistivity methods for estimating hydraulic conductivities in glacial outwash materials, using the results of Schlumberger electrical soundings at six sites in southern Rhode Island where pumping tests had previously been made.
Abstract: The objective of this study was to develop surface electrical resistivity methods for estimating hydraulic conductivities in glacial outwash materials Aquifer electrical resistivities were determined from the results of Schlumberger electrical soundings at six sites in southern Rhode Island where pumping tests had previously been made Hydraulic conductivities and transmissivities determined from pumping tests were then correlated with resistivities obtained from electrical soundings Results indicate that electrical resistivities determined from soundings can be used to predict aquifer hydraulic conductivities; an empirical relation between aquifer electrical resistivity and aquifer hydraulic conductivity was developed A semiempirical relation between aquifer formation factor and hydraulic conductivity was also developed

229 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive experimental investigation was performed to understand the pullout behavior of polypropylene fibers from a cementitious matrix and the effect of exposure to degrading environments, like seawater and salt water, on the interfacial bond between the fibers and cementitious matrices were studied.

228 citations

Journal ArticleDOI
TL;DR: In this paper, a set of experiments designed to investigate factors that may influence proxy-based reconstructions of large-scale temperature patterns in past centuries are presented from a set-of-experiments.
Abstract: Results are presented from a set of experiments designed to investigate factors that may influence proxy-based reconstructions of large-scale temperature patterns in past centuries. The factors investigated include 1) the method used to assimilate proxy data into a climate reconstruction, 2) the proxy data network used, 3) the target season, and 4) the spatial domain of the reconstruction. Estimates of hemispheric-mean temperature are formed through spatial averaging of reconstructed temperature patterns that are based on either the local calibration of proxy and instrumental data or a more elaborate multivariate climate field reconstruction approach. The experiments compare results based on the global multiproxy dataset used by Mann and coworkers, with results obtained using the extratropical Northern Hemisphere (NH) maximum latewood tree-ring density set used by Briffa and coworkers. Mean temperature reconstructions are compared for the full NH (Tropics and extratropics, land and ocean) and ext...

228 citations

Journal ArticleDOI
TL;DR: In this article, the authors used a dynamic firn densification model to calculate the firn-ice transition depth and the age of the ice at this depth and an air diffusion model to determine the air at the transition.
Abstract: The air occluded in ice sheets and glaciers has, in general, a younger age (defined as the time after its isolation from the atmosphere) than the surrounding ice matrix because snow is first transformed into open porous firn, in which the air can exchange with the atmosphere. Only at a certain depth (firn-ice transition) the pores are pinched off and the air is definitely isolated from the atmosphere. The firn-ice transition depth is at around 70 m under present climatic conditions at Summit, central Greenland. The air at this depth is roughly 10 years old due to diffusive mixing, whereas the ice is about 220 years old. This results in an age difference between the air and the ice of 210 years. This difference depends on temperature and accumulation rate and did thus not remain constant during the past. We used a dynamic firn densification model to calculate the firn-ice transition depth and the age of the ice at this depth and an air diffusion model to determine the age of the air at the transition. Past temperatures and accumulation rates have been deduced from the δ18O record using time independent functions. We present the results of model calculations of two paleotemperature scenarios yielding a record of the age difference between the air and the ice for the Greenland Ice Core Project (GRIP) and the Greenland Ice Sheet Project Two (GISP2) ice cores for the last 100,000 years. During the Holocene, the age difference stayed rather stable around 200 years, while it reached values up to 1400 years during the last glaciation for the colder scenario. The model results are compared with age differences obtained independently by matching corresponding climate events in the methane and δ18O records assuming a very small phase lag between variations in the Greenland surface temperature and the atmospheric methane. The past firn-ice transition depths are compared with diffusive column heights obtained from δ15N of N2 measurements. The results of this study corroborate the large temperature change of 20 to 25 K from the coldest glacial to Holocene climate found by evaluating borehole temperature profiles.

228 citations


Authors

Showing all 11569 results

NameH-indexPapersCitations
James M. Tiedje150688102287
Roberto Kolter12031552942
Robert S. Stern12076162834
Michael S. Feld11955251968
William C. Sessa11738352208
Kenneth H. Mayer115135164698
Staffan Kjelleberg11442544414
Kevin C. Jones11474450207
David R. Nelson11061566627
Peter K. Smith10785549174
Peter M. Groffman10645740165
Ming Li103166962672
Victor Nizet10256444193
Anil Kumar99212464825
James O. Prochaska9732073265
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202344
2022161
20211,105
20201,058
2019996
2018888