960 research outputs found
Code from: An evolutionary attractor model for sapwood cross section in relation to leaf area
No full text<p>This repository contains all the code used in the manuscript:</p>
<p>Westoby, M, W. K. Cornwell, and D. S. Falster. “An evolutionary attractor model for sapwood cross section in relation to leaf area.” <em>Journal of Theoretical Biology</em> <strong>303</strong> (2012): 98–109. doi: 10.1016/j.jtbi.2012.03.008.</p>
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Oregon Plan for Salmon and Watersheds
No full textStaci Stein, Trevan J. Cornwell, Kim K. Jones.Title from PDF title page (viewed on April 12, 2022).Covers OCLC #1310491306 and OCLC #1310490398.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.This project was financed with funds from the Oregon Watershed Enhancement Board, Oregon Department of Fish and Wildlife, and U.S. Fish and Wildlife Service Contract 13420-8-J810.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Propagation of coherence in scattering: an experiment using interplanetary scintillation
No full textRestricted Access.It is well known that high-time-resolution imaging of the optical seeing disk reveals the existence of speckles inside
the envelope. Since analogs of seeing disks occur in many different fields, one might expect that analogs of speckles
also exist. Using radio-astronomical techniques, we have studied one such example in depth: interplanetary
scintillation. By using a radio-interferometric array, we measured directly the coherence of the radiation after
scattering by the solar wind and confirmed the existence of fine-scale structure similar to speckles. In order to
understand further the behavior of the coherence function after scattering, we adapted and extended the theory
previously developed by Cornwell and Napier [in Proceedings of the National Radio Astronomy Observatory
Workshop on Radio Astronomy in Space (National Radio Astronomy Observatory, Greenbank, W. Va., 1986);
Radio Sci. 23, 739 (1988)] for the case of coherence measurements at the focal plane of a single-reflector radio
telescope. We develop and demonstrate a test for coherence of the scattered radiation, and we discuss the prospects
for high-angular-resolution imaging of objects. This treatment also leads to new insights into the effect of spatial
coherence of emitters on interferometric measurements
A treatise on civil polity and political economy: with an appendix, containing a brief account of the powers, duties, and salaries, of national, state, county and town officers. For the use of schools and academies. By Marcius Willson.
No full textvi, [7]-299 p
The thermal conductivity of molten salts
No full textExperimental values of the thermal conductivity of molten salts are reviewed and found to deviate appreciably from values predicted by semi-empirical theories to the thermal conductivity of liquids. The author shows that for univalent molten salts a simple correlation exists between the thermal conductivity at the melting point and the mean ionic weight of a univalent molten salt. Mixtures of molten salts have a thermal conductivity which is less than the proportional mean of the constituent salts.</p
That's 'é' not 'þ' '?' or '☐': a user-driven context-aware approach to erroneous metadata in digital libraries
No full textIn this paper we present a novel system for user-driven integration of name variants when interacting with web-based information systems. The growth and diversity of online information means that many users experience disambiguation and collocation errors in their information searching. We approach these issues via a client-side JavaScript browser extension that can reorganise web content and also integrate remote data sources. The system is illustrated through three worked examples using existing digital libraries
The thermoelectric potential of molten salt thermocells
No full textThe thermoelectric potential of a molten salt thermocell is not only dependent on the molten salt but also on the types of electrodes used for measurement. The thermo-electric potential of a thermocell with reversible electrodes constructed of the metal of the salt is determined by the entropy changes of the cation and is termed the 'cationic thermoelectric potential' by the author. Similarly, electrodes of the anionic component of the salt lead to an anionic thermoelectric potential. This paper is concerned with the thermoelectric potential of cationic thermocells containing pure salts, and binary mixtures of pure salts with a common anion or cation. Previous work has been reviewed and the theory of the thermoelectric potential and the entropies of transfer of ions in mixtures of salts has been extended. Experimental studies of cells containing argentous and cuprous halide mixtures between pure metal and alloy electrodes have generally confirmed this theory. The possibility of using the thermoelectric potential of a molten salt thermocell for electrical generation was examined experimentally by the construction of a 13 V trial generator. This form of direct generation was shown to be possible but the expected efficiency of no more than 10% rather limited the field of application.</p
Successful interventions with difficult pupil behaviour in primary schools : a critique of consultative practice between educational psychologists and teachers from the perspective of applied behavioural analysis, organisational dynamics and attribution shift.
No full textThis two-part study examines practice by educational psychologists who draw upon behavioural psychology when consulting with teachers of pupils of primary age range deemed to be displaying difficult behaviour. The first section examines the content and effectiveness of strategies and aspects of the consultative relationship by means of a postal questionnaire completed by a sample of 68 educational psychologists from 13 Local Education Authorities. Unlike published accounts of successful interventions, this questionnaire study examines practice with a variety of outcomes. Results show that educational psychologists favour approaches that frequently incorporate contingent teacher praise but that there are few grounds to warrant concerns about the 'dangers of a mindless technology' (Berger 1979) or 'behavioural overkill' (Wheldall 1981). The second section of the study concentrates upon the teachers' perspectives and is based upon a structured interview with 24 primary range teachers in 8 LEAs. The teachers were identified by local educational psychologists as having taken part in consultations concerning the difficult behaviour of a pupil in their class. The sample was also selected so that each had experienced successful outcomes following a recommended intervention that derived to some extent from behavioural psychology. Using a grounded theory approach, these outcomes are shown to be far more closely related to factors such as staff culture, organisational boundaries and inter-personal dynamics than is normally recognised in the literature on behavioural interventions. The study concludes with a formal statement of the emergent grounded theory in respect of successful behavioural consultations in primary schools
KRAS mutation is present in a small subset of primary urinary bladder adenocarcinomas.
No full textHistopathology KRAS mutation is present in a small subset of primary urinary bladder adenocarcinomas Aims: To determine whether KRAS mutations occur in primary bladder adenocarcinoma. Methods and results: Twenty-six cases of primary urinary bladder adenocarcinoma were analysed. DNA was extracted from formalin-fixed, paraffin-embedded tissue and amplified with shifted termination assay technology, which recognizes wild-type or mutant target sequences and selectively extends detection primers with labelled nucleotides. A mutation in KRAS was found in three (11.5%) of 26 primary bladder adenocarcinomas. Two of these three cases exhibited a G13D mutation, whereas the remaining case contained a mutation in G12V. None of the ten cases of urothelial carcinoma with glandular differentiation displayed KRAS mutation. Colonic adenocarcinoma contained a KRAS mutation in 18 (33%) of 55 cases. There was no distinct difference with regard to grade, stage or outcome according to the limited clinicopathological data available. However, the two youngest patients, aged 32 and 39 years, in our study group, with a mean population age of 61 years, were found to have mutations in KRAS. Conclusions: KRAS mutations are present in a small subset of primary urinary bladder adenocarcinomas. Future clinical trials for treatment of bladder adenocarcinoma, employing targeted therapies similar to those used for treatment of colon cancer, may also benefit from the predictive implications of KRAS mutational testing
Plant-driven variation in decomposition rates improves projections of global litter stock distribution.
No full textPlant litter stocks are critical, regionally for their role in fueling fire
regimes and controlling soil fertility, and globally through their feedback
to atmospheric CO2 and climate. Here we employ two global databases
linking plant functional types to decomposition rates of wood and leaf
litter (Cornwell et al., 2008; Weedon et al., 2009) to improve future
projections of climate and carbon cycle using an intermediate complexity
Earth System model. Implementing separate wood and leaf litter
decomposabilities and their temperature sensitivities for a range of plant
functional types yielded a more realistic distribution of litter stocks in
all present biomes with the exception of boreal forests and projects a
strong increase in global litter stocks by 35 Gt C and a concomitant small
decrease in atmospheric CO2 by 3 ppm by the end of this century.
Despite a relatively strong increase in litter stocks, the modified
parameterization results in less elevated wildfire emissions because of a
litter redistribution towards more humid regions
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