3,963 research outputs found
Exploratory talk within collaborative small groups in mathematics
No full textThis report describes one aspect of a wider research study on exploratory talk within collaborative small groups in secondary mathematics lessons. It outlines students’ views of using collaborative activity to learn mathematics. The fuller research study explores the extent to which exploratory talk occurs in collaborative peer groups in secondary mathematics classrooms
Audio Interview with Mr. Jefferson Davis Edwards
No full textAudio - Mr. Edwards discusses immigrating to Alberta due to segregation in the United States. He recounts the early history, leaders and locations of black settlements in Alberta. He reveals how Amber Valley got its name along with descriptions of early social activities such as picnics and Sunday School. Freighting, the post office, the Hudson's Bay and various other businesses and social activities are also described (20 minutes)Interview of Mr. J.D. Edwards in April 1961, re-recorded by R. Tannas March 1980, from Reel to Reel to Cassette. Mr. Edwards is approximately 73 years of age at time of interview and recalls numerous details
Computational identification and analysis of protein short linear motifs
No full textShort linear motifs (SLiMs) in proteins can act as targets for proteolytic cleavage, sites of post-translational modification, determinants of sub-cellular localization, and mediators of protein-protein interactions. Computational discovery of SLiMs involves assembling a group of proteins postulated to share a potential motif, masking out residues less likely to contain such a motif, down-weighting shared motifs arising through common evolutionary descent, and calculation of statistical probabilities allowing for the multiple testing of all possible motifs. Much of the challenge for motif discovery lies in the assembly and masking of datasets of proteins likely to share motifs, since the motifs are typically short (between 3 and 10 amino acids in length), so that potential signals can be easily swamped by the noise of stochastically recurring motifs. Focusing on disordered regions of proteins, where SLiMs are predominantly found, and masking out non-conserved residues can reduce the level of noise but more work is required to improve the quality of high-throughput experimental datasets (e.g. of physical protein interactions) as input for computational discovery
Does the Current Account Matter?
No full textThe purpose of this paper is to investigate in detail the behavior of the current account in emerging economies, and in particular its role if any in financial crises. Models of current account behavior are reviewed, and a dynamic model of current account sustainability is developed. The empirical analysis is based on a massive data set that covers over 120 countries during more than 25 years. Important controversies related to the current account including the extent to which current account deficits help predict currency crises are also analyzed. Throughout the paper I am interested in analyzing whether there is evidence supporting the idea that there are costs involved in running 'very large' deficits. Moreover, I investigate the nature of these potential costs, including whether they are particularly high in the presence of other type of imbalances.
Reviving the past : eighteenth-century evangelical interpretations of church history
No full textThis study addresses eighteenth-century English-speaking evangelicals' understandings of church history, through the lens of published attempts to represent preceding Christian centuries panoramically or comprehensively. Sources entail several short reflections on history emerging in the early years of the transatlantic Revival (1730s-1740s) and subsequent, more substantial efforts by evangelical leaders John Gillies, Jonathan Edwards, John Wesley, Joseph and Isaac Milner, and Thomas Haweis. Little scholarly analysis exists on these sources, aside from the renaissance of interest in recent decades in Edwards. This is surprising, considering the acknowledged prominence of history-writing in the eighteenth century and the influence attributed, then and now, to the works of authors such as Gibbon, Hume, and Robertson. The aim is, first, to elucidate each of the above evangelicals' interpretations of the Christian past, both in overview and according to what they said on a roster of particular historical events, people and movements, and then to consider shared and divergent aspects. These aspects range from points of detail to paradigmatic theological convictions. Secondarily, evangelical church histories are analyzed in relation to earlier Protestant as well as eighteenth-century 'enlightened' historiography, in part through attention to evangelical authors' explicit engagement with these currents. This contextualization assists in determining the unique qualities of evangelical interpretations. Is there, then, evidence of a characteristically 'evangelical' perspective on church history? An examination of this neglected area illumines patterns and particulars of evangelicals' historical thought, and these in turn communicate the self-perceptions and the defining features of evangelicalism itself. Findings support the primary contention that evangelical leaders made use of a dynamic pattern of revival and declension as a means of accounting for the full history of Christianity. Beyond displaying the central place of 'revival' for evangelicals, these church histories demonstrate evangelicalism‘s complex relationship—involving both receptivity and critique—with Protestant and Enlightenment currents of historical inquiry
Why the Electoral College Is Bad for America Third Edition
No full textA new edition of the best†'known book critiquing the U.S. electoral college In this third edition of the definitive book on the unique system by which Americans choose a president-and why that system should be changed-George Edwards includes a new chapter focusing on the 2016 election. "As the U.S. hurtles toward yet another election in which the popular vote loser may become president, Edwards's book is essential reading. It clearly and methodically punctures myths about the Electoral College's benefits."-Richard L. Hasen, author of The Voting Wars "Supported by both history and data, George Edwards convincingly argues the Electoral College is anti†'democratic, anti†'equality, and anti†'common sense. We should dismantle it, and soon."-Kent Greenfield, author of Corporations Are People Too (And They Should Act Like It
Determination of Pure Neutron Radiolysis Yields for use in Chemical Modeling of Supercritical Water
No full textThis work has determined pure neutron radical yields at elevated temperature and pressure up to supercritical conditions using a reactor core radiation. The data will be necessary to provides realistic conditions for material corrosion experiments for the supercritical water reactor (SCWR) through water chemistry modeling. The work has been performed at the University of Wisconsin Nuclear Reactor using an apparatus designed to transport supercritical water near the reactor core. Low LET yield data used in the experiment was provided by a similar project at the Notre Dame Radiation Lab.
Radicals formed by radiolysis were measured through chemical scavenging reactions. The aqueous electron was measured by two methods, a reaction with N2O to produce molecular nitrogen and a reaction with SF6 to produce fluoride ions. The hydrogen radical was measured through a reaction with ethanol-D6 (CD3CD2OD) to form HD. Molecular hydrogen was measured directly. Gaseous products were measured with a mass spectrometer and ions were measured with an ion selective electrode. Radiation energy deposition was calibrated for neutron and gamma radiation separately with a neutron activation analysis and a radiolysis experiment. Pure neutron yields were calculated by subtracting gamma contribution using the calibrated gamma energy deposition and yield results from work at the Notre Dame Radiation Laboratory.
Pure neutron yields have been experimentally determined for aqueous electrons from 25o to 400o�C at 248 bar and for the hydrogen radical from 25o�C to 350o�C at 248�bar. Isothermal data has been acquired for the aqueous electron at 380o�C�and 400o C as a function of density. Molecular hydrogen yields were measured as a function of temperature and pressure, although there was evidence that chemical reactions with the walls of the water tubing were creating molecular hydrogen in addition to that formed through radiolysis. Critical hydrogen concentration behavior was investigated but a final result was not determined because a measurable oxygen yield was not seen at the outlet of the radiolysis loop
Contract Enforcement and Institutions among the Maghribi Traders: Refuting Edwards and Ogilvie
No full textEdwards and Ogilvie (2008) dispute the empirical basis for the view (Greif, e.g., 1989, 1994, 2006) that multilateral reputation mechanism mitigated agency problems among the eleventh-century Maghribi traders. They assert that the relations among merchants and agents were law-based. This paper refutes this assertion using quantitative and documentary evidence thereby vindicating the position that the legal system had a marginal role in mitigating agency problems in long-distance trade in this historical era.** Edwards and Ogilvie constantly present legal actions in non-trade related legal cases as evidence for a reliance on the legal system for matters pertaining to long-distance trade. Their criticism of Greif’s documentary analysis also fails scrutiny. The claim that merchants' relations with their overseas agents were law-based is wrong. This paper is based on quantitative analyses of the corpuses containing the hundreds of documents on which the literature relies and a careful review of the documents and the literature Edwards and Ogilvie cite. Their assertion is shown to be based on unrepresentative and irrelevant examples, an inaccurate description of the literature, and a consistent misreading of the few sources they consulted. In particular, their examples for the use of the court are mainly taken from mandatory legal procedures associated with sorting out the assets and liabilities of deceased traders’ estates. Such examples do not support the claim that agency relations were law-based. The quantitative analysis reveals that empirical basis for the multilateral reputation view is stronger than originally perceived. This paper also sheds light on the roles of the legal system and reputation mechanism during this period.
Miscellanies, in prose and verse. By Miss Edwards [electronic resource].
No full textThe twelve final leaves contain 'A list of the subscribers' with separate register.Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
Groundwater availability modeling: Northern segment of the Edwards Aquifer, Texas
No full textThe northern segment of the Edwards aquifer covers an area that includes some of the fastest growing counties in Texas. As a result of rapid population growth, demand for water in this region is also rising. A groundwater availability model simulating flow through this segment of the Edwards aquifer was constructed as a groundwater resource management tool. The purpose of this tool is to aid groundwater conservation districts, regional water planning groups, and others in evaluating groundwater resource management strategies to meet projected groundwater demands. This model was constructed by calibrating to steady-state conditions for 1980 and historical transient conditions for the period 1980-2000. The calibrated model can be used to predict future water-level changes that may result from projected pumping rates and/or climatic conditions. The model results indicate that (1) no historical regional-scale cones-of-depression exist in the northern Edwards aquifer, (2) 60-80 percent of natural discharge is baseflow to perennial streams that cross the aquifer outcrop, (3) pumping is less than 20 percent of total discharge, (4) the flow system is more active in the unconfined part of the aquifer than in downdip portions, and (5) gradual long-term water-level decline is occurring in the Pflugerville-Georgetown area. Historical pumping trends indicate steadily increasing municipal, rural domestic, and industrial pumping, rising from 20,000 to 30,000 acre-feet/year over the past 20 years. Regional-scale drawdown associated with increasing pumping has not been observed, so far, largely because pumping is a relatively small portion of the total water budget of this segment of the Edwards aquifer. However, pumping results in local drawdown. -- Author Open Access Edwards Aquifer Authority Collection See Extended description for more information
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