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Articles 5041 - 5070 of 8069
Full-Text Articles in Entire DC Network
Adsorption Of Pb And Cd Onto Metal Oxides And Organic Material In Natural Surface Coatings As Determined By Selective Extractions: New Evidence For The Importance Of Mn And Fe Oxides, Deming Dong, Yarrow M. Nelson, Leonard W. Lion, Michael L. Shuler, Whilliam C. Ghiorse
Adsorption Of Pb And Cd Onto Metal Oxides And Organic Material In Natural Surface Coatings As Determined By Selective Extractions: New Evidence For The Importance Of Mn And Fe Oxides, Deming Dong, Yarrow M. Nelson, Leonard W. Lion, Michael L. Shuler, Whilliam C. Ghiorse
Civil and Environmental Engineering
Surface coatings (biofilms and associated minerals) were collected on glass slides in the toxic surface waters of Cayuga Lake (New York State, U.S.A.) and were used to evaluate the relative contributions of Fe, Mn and Al oxides and organic material to total observed Pb and Cd adsorption by the surface coating materials. Several alternative selective extraction techniques were evaluated with respect to both selectivity and alteration of the residual unextracted material. Pb and Cd adsorption was measured under controlled laboratory conditions (mineral salts solution with defined metal speciation, ionic strength 0.05 M, 25°C and pH 6.0) before and after extractions …
Estimation Of Base Temperatures For Nine Weed Species, Scott J. Steinmaus, Timothy S. Prather, Jodie S. Holt
Estimation Of Base Temperatures For Nine Weed Species, Scott J. Steinmaus, Timothy S. Prather, Jodie S. Holt
Biological Sciences
Experiments were conducted to test several methods for estimating low temperature thresholds for seed germination. Temperature responses of nine weeds common in annual agroecosystems were assessed in temperature gradient experiments. Species included summer annuals (Amaranthus albus, A. palmeri, Digitaria sanguinalis, Echinochloa crus-galli, Portulaca oleracea, and Setaria glauca), winter annuals (Hirschfeldia incana and Sonchus oleraceus), and Conyza canadensis, which is classified as a summer or winter annual. The temperature below which development ceases (Tbase) was estimated as the x-intercept of four conventional germination rate indices regressed on temperature, by repeated probit analysis, …
Does Market Timing Contribute To The Cattle Cycle?, Stephen F. Hamilton, Terry L. Kastens
Does Market Timing Contribute To The Cattle Cycle?, Stephen F. Hamilton, Terry L. Kastens
Economics
Recent evidence suggests that cyclical cattle inventories are driven by exogenous shocks. This article examines a second possible contributing factor to the cattle cycle: a market timing effect that arises from individual attempts to maintain countercyclical inventories. The model uncovers an important conceptual point: to the extent that cycles are driven by exogenous shocks, a representative producer should outperform one who maintains a constant inventory; whereas, for cycles induced by market timing, a representative producer should underperform one with a constant inventory. Simulated net returns over 1974–98 reveal that a constant-inventory manager significantly outperformed the representative U.S. producer, which indicates …
Mustang Daily, January 26, 2000
Mustang Daily, January 26, 2000
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
Mustang Daily, January 20, 2000
Mustang Daily, January 20, 2000
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
January 19, 2000 Cal Poly Report, Public Affairs Office
January 19, 2000 Cal Poly Report, Public Affairs Office
Cal Poly Report
No abstract provided.
Fork-Tailed Katydid Studies, David H. Headrick
Fork-Tailed Katydid Studies, David H. Headrick
Horticulture and Crop Science
The fork-tailed katydid, Scudderia furcata Brunner (Orthoptera: Tettigoniidae) was considered a minor pest of citrus in California, but in the last few years has increasingly become a problem due to reduction in organophosphate and carbamate pesticides (Grafton-Cardwell 1999). Our objective is to study the biology and behavior of the fork-tailed katydid as a pest of commercially grown citrus in order to develop ecologically-based control methods for application in commercial citrus production.
Course And Curricular Updates To The California Polytechnic State University 2000-2001 Catalog, Academic Affairs, California Polytechnic State University - San Luis Obispo
Course And Curricular Updates To The California Polytechnic State University 2000-2001 Catalog, Academic Affairs, California Polytechnic State University - San Luis Obispo
Course Catalogs
No abstract provided.
California Polytechnic State University 2000-2001 Catalog, Academic Affairs, California Polytechnic State University - San Luis Obispo
California Polytechnic State University 2000-2001 Catalog, Academic Affairs, California Polytechnic State University - San Luis Obispo
Course Catalogs
No abstract provided.
Time Course And Magnitude Of Synthesis Of Heat-Shock Proteins In Congeneric Marine Snails (Genus Tegula) From Different Tidal Heights, Lars Tomanek, George N. Somero
Time Course And Magnitude Of Synthesis Of Heat-Shock Proteins In Congeneric Marine Snails (Genus Tegula) From Different Tidal Heights, Lars Tomanek, George N. Somero
Biological Sciences
The time course and magnitude of the heat-shock response in relation to severity of thermal stress are important, yet poorly understood, aspects of thermotolerance. We examined patterns of protein synthesis in congeneric marine snails (genus Tegula) that occur at different heights along the subtidal to intertidal gradient after a thermal exposure (30°C for 2.5 h, followed by 50 h recovery at 13°C) that induced the heat-shock response. We monitored the kinetics and magnitudes of protein synthesis by quantifying incorporation of 35S-labeled methionine and cysteine into newly synthesized proteins and observed synthesis of putative heat-shock proteins (hsp’s) of size …
Energetic Dynamics And Anuran Breeding Phenology: Insights From A Dynamic Game, Shannon J. Mccauley, Sarah S. Bouchard, Brian J. Farina, Kavita Isvaran, Suhel Quader, Daniel W. Wood, Colette M. St. Mary
Energetic Dynamics And Anuran Breeding Phenology: Insights From A Dynamic Game, Shannon J. Mccauley, Sarah S. Bouchard, Brian J. Farina, Kavita Isvaran, Suhel Quader, Daniel W. Wood, Colette M. St. Mary
Biological Sciences
We designed a dynamic optimization model to examine anuran-breeding phenologies. We evaluated the fitness consequences for males adopting one of four alternative strategies: calling, satelliting, foraging, or hiding. Various factors potentially influence male behavior, including energy reserves, predation risk, cost of calling, probability of finding food, distribution of male energy states in the population, and probability of surviving to another breeding season. We manipulated these parameters to determine how strongly each affects breeding phenology and chorus structure. Manipulating parameters related to the energetic costs and benefits of individual decisions, we generated the three basic patterns of anuran breeding phenology: explosive, …
Optical Fractionation Of Chlorophyll And Primary Production For Coastal Waters Of The Southern Ocean, Mark A. Moline, Barbara B. Prezelin
Optical Fractionation Of Chlorophyll And Primary Production For Coastal Waters Of The Southern Ocean, Mark A. Moline, Barbara B. Prezelin
Biological Sciences
Our objective was to quantify the potential variability in remotely sensed chlorophyll a (Chl a) and primary productivity in coastal waters of the Southern Ocean. From data collected throughout the springs/summers of 1991–1994, we calculated the proportion of water column Chl a and primary productivity within the upper optical attenuation length (K −1 par) and the satellite-weighted depth. The temporal variability was resolved every 2–3 days and was observed to be greater within years than between years. Three-year averages (n=223) revealed that 10.2 ± 3.6% of total Chl a and 14.8 ± 6.5% of production occurred …
Neural Networks And Structured Knowledge: Rule Extraction And Applications, Franz J. Kurfess
Neural Networks And Structured Knowledge: Rule Extraction And Applications, Franz J. Kurfess
Computer Science and Software Engineering
As the second part of a special issue on "Neural Networks and Structured Knowledge," the contributions collected here concentrate on the extraction of knowledge, particularly in the form of rules, from neural networks, and on applications relying on the representation and processing of structured knowledge by neural networks. The transformation of the low-level internal representation in a neural network into higher-level knowledge or information that can be interpreted more easily by humans and integrated with symbol-oriented mechanisms is the subject of the first group of papers. The second group of papers uses specific applications as starting point, and describes approaches …
Evaluation Of The Performance Enhancement Of Silicone Biofouling-Release Coatings By Oil Incorporation, Kathryn Truby, Christina Wood, Judith Stein, James Cella, John Carpenter, Christopher Kavanagh, Geoff Swain, Deborah Wiebe, David Lapota, Anne Meyer, Eric Holm, Dean Wendt, Celia Smith, Jean Montemarano
Evaluation Of The Performance Enhancement Of Silicone Biofouling-Release Coatings By Oil Incorporation, Kathryn Truby, Christina Wood, Judith Stein, James Cella, John Carpenter, Christopher Kavanagh, Geoff Swain, Deborah Wiebe, David Lapota, Anne Meyer, Eric Holm, Dean Wendt, Celia Smith, Jean Montemarano
Biological Sciences
In response to increased evidence of ecosystem damage by toxic antifouling paints, many researchers have developed nontoxic silicone fouling release coatings. The fouling release capability of these Systems may be improved by adding nonbonding silicone oils to the coating matrix. This idea has been tested by comparing the adhesion strength of hard- and soft-fouling organisms on a cured polydimethylsilicone (PDMS) network to that of the same network containing free polydi-methyldiphenylsilicone (PDMDPS) oil at five exposure sites in North America and Hawaii. Fouling coverage is discussed, together with the bioadhesion data, to emphasize that although these coatings foul the fouling is …
Cal Poly Program Flyers: 2000-2005, Robert Field
Cal Poly Program Flyers: 2000-2005, Robert Field
Research Scholars in Residence
No abstract provided.
Biologically-Controlled Mineralization Of Magnetic Iron Minerals By Magnetotactic Bacteria, D. A. Bazylinski, R. B. Frankel
Biologically-Controlled Mineralization Of Magnetic Iron Minerals By Magnetotactic Bacteria, D. A. Bazylinski, R. B. Frankel
Physics
No abstract provided.
Temporal And Spatial Variations In Macrofouling Of Silicone Fouling-Release Coatings, Christina Darkangelo Wood, Kathryn Truby, Judith Stein, Deborah Wiebe, Eric Holm, Dean Wendt, Celia Smith, Christopher Kavanagh, Jean Montemarano, Geoff Swain, Anne Meyer
Temporal And Spatial Variations In Macrofouling Of Silicone Fouling-Release Coatings, Christina Darkangelo Wood, Kathryn Truby, Judith Stein, Deborah Wiebe, Eric Holm, Dean Wendt, Celia Smith, Christopher Kavanagh, Jean Montemarano, Geoff Swain, Anne Meyer
Biological Sciences
Nontoxic, low surface free energy silicone coatings having reduced biofouling adhesion strength have been developed as an alternative to antifouling paints. Silicone coatings permit macrofouling to adhere; however, fouling can be removed easily by water pressure or light scrubbing. One of the current methods used to evaluate the performance of non-toxic silicone fouling-release coatings relies heavily on fouling coverage. The organismal community structure as well as total coverage can affect the ease of fouling removal from these coatings. This paper explores fouling coverage and organismal adhesion over time. Long-term fouling coverage data were collected at four sites (in Massachusetts, Hawaii …
Eating Frequency And Risk Of Colorectal Cancer, Marilyn Tseng, Deborah D. Ingram, Rebecca Darden, Regina G. Ziegler, Matthew P. Longnecker
Eating Frequency And Risk Of Colorectal Cancer, Marilyn Tseng, Deborah D. Ingram, Rebecca Darden, Regina G. Ziegler, Matthew P. Longnecker
Kinesiology and Public Health
Case-control studies have found elevated risk of colorectal cancer with higher eating frequency. The present analyses, the first to examine this association using prospectively collected information, utilized nationally representative data from the Epidemiologic Follow-Up Study of the First National Health and Nutrition Examination Survey (NHEFS). The study population included 9,978 subjects followed from 1982–84 to 1992. Colorectal cancer cases (n = 141) were identified by self-report, hospital records, and death certificates. Interviews conducted in 1982–84 provided information on meal and snack frequencies and covariates of interest. Relative risk (RR) of colorectal cancer and 95% confidence intervals (CI) were estimated using …
Socialization Of Prospective Physical Education Teachers: The Story Of New Blood, Camille P. O'Bryant, Mary O'Sullivan, Jeanne Raudensky
Socialization Of Prospective Physical Education Teachers: The Story Of New Blood, Camille P. O'Bryant, Mary O'Sullivan, Jeanne Raudensky
Kinesiology and Public Health
There has been much criticism of how teachers are prepared to teach and physical education has not been immune from this criticism. Despite numerous efforts to improve the content and focus of teacher education programmes there is still a paucity of programme evaluation research on the efficacy of these teacher education programmes (Metzler & Tjeerdsma, 1998). This paper reports on part of a yearlong investigation on the efficacy of a graduate physical education teacher education programme to prepare teachers. The focus of this aspect of the study was to identify what attracted graduate students to pursue a teaching career and …
December 8, 1999 Cal Poly Report, Public Affairs Office
December 8, 1999 Cal Poly Report, Public Affairs Office
Cal Poly Report
No abstract provided.
Mustang Daily, December 3, 1999
Mustang Daily, December 3, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
December 1, 1999 Cal Poly Report, Public Affairs Office
December 1, 1999 Cal Poly Report, Public Affairs Office
Cal Poly Report
No abstract provided.
Mustang Daily, November 30, 1999
Mustang Daily, November 30, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
Mustang Daily, November 29, 1999
Mustang Daily, November 29, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
Mustang Daily, November 23, 1999
Mustang Daily, November 23, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
Mustang Daily, November 22, 1999
Mustang Daily, November 22, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
Mustang Daily, November 16, 1999
Mustang Daily, November 16, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
Mustang Daily, November 15, 1999
Mustang Daily, November 15, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
Immaccs: A Military Decision-Support System, Jens G. Pohl, Anthony A. Wood, Kym Jason Pohl, Arthur J. Chapman
Immaccs: A Military Decision-Support System, Jens G. Pohl, Anthony A. Wood, Kym Jason Pohl, Arthur J. Chapman
Collaborative Agent Design (CAD) Research Center
The Integrated Marine Multi-Agent Command and Control System (IMMACCS) is a multi-agent, distributed system, designed to provide a ‘common tactical picture’ with integrated and meaningful decision-support facilities to authorized operators at any access node. IMMACCS has been implemented as a three-tier architecture that distinguishes between information, logic and presentation. It utilizes an object-serving communication facility with subscription and multi-casting capabilities that is based on the Common Object Request Broker Architecture (CORBA). With an emphasis on application, IMMACCS was designed and implemented in concert with its military users as an integral component of experiments conceived by the Marine Corps Warfighting Laboratory …
November 10, 1999 Cal Poly Report, Public Affairs Office
November 10, 1999 Cal Poly Report, Public Affairs Office
Cal Poly Report
No abstract provided.