89 research outputs found
Progress in Economics
No full textThe Author discusses the relevance of studying the progress made in economic research and how to assess the existence of different models
Representation of lattices with modal operators in two-sorted frames
No full textWe study general lattices with normal unary operators for which we prove relational representation and duality results. Similar results have appeared in print, using Urquhart's lattice representation, by the second author with Vakarelov, Radzikowska and Rewitzky. We base our approach in this article on the Hartonas and Dunn lattice duality, proven by Gehrke and Harding to deliver a canonical lattice extension, and on recent results by the first author on the relational representation of normal lattice operators. We verify that the operators at the representation level (appropriately generated by relations) are the canonical extensions of the lattice operators, in Gehrke and Harding's sense. © 2019 - IOS Press and the authors. All rights reserved
Experimental reintroduction of woody debris on the Williams River, NSW: geomorphic and ecological responses
No full textA total of 436 logs were used to create 20 engineered log jams (ELJs) in a 1.1 km reach of the Williams River, NSW, Australia, a gravel-bed river that has been desnagged and had most of its riparian vegetation removed over the last 200 years. The experiment was designed to test the effectiveness of reintroducing woody debris (WD) as a means of improving channel stability and recreating habitat diversity. The study assessed geomorphic and ecological responses to introducing woody habitat by comparing paired test and control reaches. Channel characteristics (e.g. bedforms, bars, texture) within test and control reaches were assessed before and after wood placement to quantify the morphological variability induced by the ELJs in the test reach. Since construction in September 2000, the ELJs have been subjected to five overtopping flows, three of which were larger than the mean annual flood. A high-resolution three-dimensional survey of both reaches was completed after major bed-mobilizing flows. Cumulative changes induced by consecutive floods were also assessed. After 12 months, the major geomorphologic changes in the test reach included an increase in pool and riffle area and pool depth; the addition of a pool-riffle sequence; an increase by 0.5-1 m in pool-riffle amplitude; a net gain of 40 m3 of sediment storage per 1000 m2 of channel area (while the control reach experienced a net loss of 15 m3/1000 m2 over the same period); and a substantial increase in the spatial complexity of bed-material distribution. Fish assemblages in the test reach showed an increase in species richness and abundance, and reduced temporal variability compared to the reference reach, suggesting that the changes in physical habitat were beneficial to fish at the reach scale
Role of Staphylococcus aureus capsular polysaccharide in osteoclastogenesis
No full textStaphylococcus aureus isolates lacking capsular polysaccharide (CP) expression (NT) are frequently recovered from patients with chronic osteomyelitis. It has been proposed that the loss of CP expression during long term bone infection is the consequence of bacterial microevolution in the bone and it could represent an adaptive advantage contributing to bacterial persistence. Considering that the presence of S. aureus in the bone microenvironment enhances osteoclastogenesis and that loss of CP is associated to chronic osteomyelitis, the aim of this study was to determine the impact of CP expression in osteoclast differentiation. We determined the ability of different S. aureus strain pairs-encapsulated (CP5+) and nonencapsulated (NT) - to induce osteoclast differentiation using RAW 264.7 cells as precursors. The S. aureus Reynolds strain CP5+ induced significantly decreased osteoclastogenesis than its genetically obtained NT derivative (p<0.05, Student t test). Equivalent results were obtained using a clinical isolate. The S. aureus NT isolate HU14, obtained from a patient with chronic osteomyelitis, induced significantly increased osteoclastogenesis than its CP5+ derivative P3.1 (p<0.05, Student t test). In addition, we analyzed the production of TNF-alpha, a pro-inflammatory cytokine known to positively modulate osteoclastogenesis. Regardless of the S. aureus pair evaluated, the NT isolates induced higher levels of TNF-alpha (p<0.05, Student t test) in osteoclast precursors, than their related CP5+ positive derivatives. Taken together, these results suggest that the loss of capsular polysaccharide expression contributes to enhance inflammatory signaling and osteoclastogenesis representing an adaptive advantage for S. aureus during chronic bone infection.Fil: Gehrke, Ana-katharina Elsa. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Maimónides. Área de Investigaciones Biomédicas y Biotecnológicas. Centro de Estudios Biomédicos, Biotecnológicos, Ambientales y de Diagnóstico; ArgentinaFil: Suligoy, C. M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; ArgentinaFil: Sordelli, Daniel Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; ArgentinaFil: Delpino, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Inmunología, Genética y Metabolismo. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Inmunología, Genética y Metabolismo; ArgentinaFil: Gómez, Marisa Ileana. Universidad Maimónides. Área de Investigaciones Biomédicas y Biotecnológicas. Centro de Estudios Biomédicos, Biotecnológicos, Ambientales y de Diagnóstico; ArgentinaLXVII Reunión Anual de la Sociedad Argentina de InmunologíaSan Miguel de TucumánArgentinaSociedad Argentina de Inmunologí
New attempts at Electronic Documents in Transport. Bolero - the end of the experiment, the beginning of the future?
No full textIn this thesis the author examines a 'revolution' taking place in the shipping industry brought on by the development of computerisation, electronic commerce and the change from paper documentation to electronic documentation in the carriage of goods by sea. The focus of the paper is on Bolero, a project of the European Community beginning in the early 1990s and which has been used commercially since September 1999. In this paper the author follows the Bolero project from its inception as an experiment through to its commercial application. The question is asked to what extent Bolero has become an alternative to, or in fact replaced paper documentation in the carriage of goods by sea. As an introduction the author looks at the paper bill of lading and other forms of sea transport documentation with a focus on their advantages and disadvantages. He then examines the development of EDI and paperless sea transport documentation, in particular Bolero and the history of its development. Following this is an in depth investigation of the Bolero system in its current form, the contractual relations involved and the position of Bolero in the surrounding legal framework in a South African and international context. Finally the author looks at the future of Bolero as a commercial enterprise
Lecture versus discussion in the study of sophomore library skills
No full textThe purpose of this study was to determine which method of instruction--the lecture or the small group discussion--would achieve the best learning results as far as knowledge of certain unfamiliar materials was concerned.
Specifically, the author of this research study tried to answer this questions When an instructor is teaching selected reference books to average-ability sophomores in an English 10 library skills unit at Fort Dodge Senior High School, Fort Dodge, Iowa, which method of instruction--the lecture or the small group discussion--will achieve the best learning results as measured by an author- constructed post-test?
In this research study the author predicted a null hypothesis, no significant difference in student learning achievement as measured by an author-constructed post-test in English 10 library skills unit of selected reference books will be found between the lecture and the small group discussion methods of teaching
MV-algebras, Grothendieck toposes and applications
No full text2014 - 2015This thesis is a contribution to the research program ‘toposes as bridges’ introduced in [12],
which aims at developing the unifying potential of the notion of Grothendieck topos as a means
for relating different mathematical theories to each other through topos-theoretic invariants.
The general methodology outlined therein is applied here to study already existing categorical
equivalences of particular interest arising in the field of many-valued logics and also to produce
new ones. The original content of the disseration is contained in [22], [21] and [23]... [edited by Author]XIV n.s
OIMB Term Photo: Summer 2009
No full textBack Row: Erin Morgan, Tom Peterman, Katie Bennett, Matthew Kleinman, Dan Erickson, Max Dresow, Aaron Norwood, Patrick Baker, Wendy Williams, Doug Warrick, Lauren Bridgeman, Coral Gehrke, Josh Lord, Zair Burris.
Second Row: Cynthia Trowbridge, Stephanie Schroeder, Mark Middleton, Max Beeken, Katie Thomas, Cameron Hirtle, Kaleonani Hurley, Kevin Chaney, Jenna Kulluson, Trish Mace.
Third Row: Matthew Greer, Victoria Sparks, Shannon Faulkinbury , Cherie Lawrence, Nate Braudrick, Craig Emmes, Alinda McMorran, Sarah Greenhalgh, Emily Castillo, Blaine Alvarez, Chris Cunningham, Charlee Jackson.
Fourth Row: Chelsea Berggren, Heather Austin, Nora Terwilliger, Maryjanna Grove, Isaac Klingensmith, Kristen Boysen, Jaci Nora, Ashley Bulseco, Brittany Kuhn, Marissa Paulling, Brittney Dlouhy, Allison Cramer, Tori Smith.
Front Row: Myndee McNeill, Jan Hodder, Alex Baker, Andy Baker, Arthur Baker, Shirley Baker, Julia Sherwood, Krystin Parkinson, Elizabeth Cooney, Anders Warrick.Photographer: Shirley Pedr
Detecting exploitable stages in the life history of koi carp (Cyprinus carpio) in New Zealand
No full textKoi carp are a highly coloured strain of common carp (Cyprinus carpio L.) and are an invasive alien species to New Zealand. The introduction of koi carp to the lower Waikato River during the 1980s has coincided with a dramatic decline in water quality within the regions riverine lakes. Removing koi carp from riverine lakes may improve water quality and preserve native biodiversity. This study used telemetry to examine the movements and seasonal habitat use of adult koi carp to find key locations to efficiently remove koi carp from the lower Waikato River basin.
Common carp are notoriously difficult to monitor in water temperatures above 20˚C using telemetry due to transmitter expulsion. To prepare for telemetry based field experiments, three tank trials were conducted to determine the most appropriate surgical technique for the implantation and retention of telemetry transmitters in koi carp. To reduce transmitter loss, two methods were initially tested in tank trials including two treatment groups and two control groups of ten adult koi carp. In one treatment, radio transmitters were anchored to the pelvic girdle, and in a second treatment, a polymer coating was applied to acoustic transmitters to reduce tissue irritation. After 365 days, expulsion rates for uncoated acoustic transmitters were 60% (n = 6), coated acoustic transmitters 50% (n = 5), unanchored radio transmitters 60% (n = 6) and anchored radio transmitters 90% (n = 9). Bacterial infection of the wound appears to be the primary mechanism for transmitter expulsion.
To reduce the influence of bacterial infection on transmitter expulsion, a slow-release antibiotic was tested to improve transmitter retention. Dummy acoustic transmitters were implanted in two groups of 20 adult koi carp, an untreated control group, and a group treated with a slow-release, single-dose antibiotic. After 176 days, the rejection rate of control fish (40%, n = 8) was twice that of fish treated with a slow-release antibiotic (20%, n = 4). Although we did not find a statistical difference between test groups, this was likely a function of sample size and we view the results as encouraging, justifying further investigation and use of slow-release antibiotics in koi carp.
Koi carp were monitored on the lower Waikato River using both radio and acoustic telemetry for 18 months. Koi carp migrated throughout the basin and frequently used lateral habitat. At least 74% of fish that were monitored for at least 250 days migrated through the waterways between riverine lakes or wetlands and the Waikato River. Waterways connecting riverine lakes and wetlands to the lower Waikato River are ideal locations to intercept migrating koi carp. Fish released at Lake Whangape occupied a total linear range (TLR) of over 120 km in just 218 days, which represents 71% of the potential in river TLR within the lower Waikato River Basin. Adult koi carp were found to be active year-round, but peak movements occurred during spawning season (October) during both years of the study. With a long-term commitment and thoughtful planning, removing a biologically significant proportion of koi carp biomass from the riverine lakes and wetlands of the lower Waikato River is feasible
Simultaneous Improvement of Schooling and the Education of Teachers: Creating a Collaborative Consciousness
No full textBased on her experience in creating a professional development center-a school-university project to improve middle schools and create appropriate professional programs for middle school teachers-theauthor examines three dysfunctional attitudes in such collaborative efforts: the Trophy Mentality; the Education-as-Entrepreneurship Mindset; and the "I\u27m Okay, You\u27re Okay" Frame of Mind. To change the three attitudes, the author suggests using three tools: careful selection of incoming participants, education for skills and attitudes of collaboration, and socialization to the collaborative roles through role modeling and rewards
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