Barriers to success: physical separation optimizes event-file retrieval in shared workspaces

2017 ◽  
Vol 82 (6) ◽  
pp. 1158-1176 ◽  
Author(s):  
Bibiana Klempova ◽  
Roman Liepelt
Author(s):  
E. C. Buck ◽  
N. L. Dietz ◽  
J. K. Bates

Operations at former weapons processing facilities in the U. S. have resulted in a large volume of radionuclidecontaminated soils and residues. In an effort to improve remediation strategies and meet environmental regulations, radionuclide-bearing particles in contaminant soils from Fernald in Ohio and the Rocky Flats Plant (RFP) in Colorado have been characterized by electron microscopy. The object of these studies was to determine the form of the contaminant radionuclide, so that it properties could be established [1]. Physical separation and radiochemical analysis determined that uranium contamination at Fernald was not present exclusively in any one size/density fraction [2]. The uranium-contamination resulted from aqueous and solid product spills, air-borne dust particles, and from the operation of an incinerator on site. At RFP the contamination was from the incineration of Pu-bearing materials. Further analysis by x-ray absorption spectroscopy indicated that the majority of the uranium was in the 6+ oxidation state [3].


Author(s):  
Luis F. Riquelme

Abstract Passing the Praxis Examination in speech-language pathology or audiology can be a difficult task. A passing score is the entry to a list of requirements for national certification (CCC-SLP, CCC-A) and for state licensure in the United States. This article will provide current information on the examination and address barriers to success that have been identified over the years. A call to action may serve to refocus efforts on improving access to success for all test-takers regardless of race/ethnicity, ability, or geographic location.


2018 ◽  
Author(s):  
Anna Newman

This infographic presents a sample scenario for how the high cost of a textbook affects student achievement. Depending on the method that students use to obtain their course materials, there are many barriers to success in their course. OER levels the playing field by giving students access to course materials on day one.


MicroRNA ◽  
2020 ◽  
Vol 09 ◽  
Author(s):  
M.S. Parker ◽  
A. Balasubramaniam ◽  
F.R. Sallee ◽  
S.L. Parker

: Matches of mature microRNAs (m-miRs) in human 3’utr can be traced to mutations producing fragments of original m-miR sequences without physical separation. (The by far fewer m-miR matches in 5’utr and cds follow similar patterns.) The sense and antisense m-miR fragments in 3’utr occur at quite similar levels. The fragmentation occurs at gene level by mutation within one of the paired m-miRs, which upon transcription results in increased interactive capability for both former pre-micro (pre-mir) RNA stem partners. The non-mutated stem partner can persist in 3’utr sequences, as is apparent from significant presence of miR-619-5p and miR-5096 and some conservation of 20 other simian-specific m-miR sequences. However, most of m-mir sequences in 3’utr are extensively fragmented, with low preservation of long matches. In flanks of individual m-miR embeds the mutated pre-mir positions are to a degree defined specifically. The m-mir matches of various sizes in 3’utr apparently reflect accumulation, on a phylogenetic time scale, of in-sequence point mutations. Across human 3’utr this fragmentation is significantly less for evolutionarily recent human m-miRs that originate in simians compared to human m-miRs first appearing in lower primates, and especially to human m-miRs introduced in non-primates.


Author(s):  
Bernhard Hommel

AbstractCommonsense and theorizing about action control agree in assuming that human behavior is (mainly) driven by goals, but no mechanistic theory of what goals are, where they come from, and how they impact action selection is available. Here I develop such a theory that is based on the assumption that GOALs guide Intentional Actions THrough criteria (GOALIATH). The theory is intended to be minimalist and parsimonious with respect to its assumptions, as transparent and mechanistic as possible, and it is based on representational assumptions provided by the Theory of Event Coding (TEC). It holds that goal-directed behavior is guided by selection criteria that activate and create competition between event files that contain action-effect codes matching one or more of the criteria—a competition that eventually settles into a solution favoring the best-matching event file. The criteria are associated with various sources, including biological drives, acquired needs (e.g., of achievement, power, or affiliation), and short-term, sometimes arbitrary, instructed aims. Action selection is, thus, a compromise that tries to satisfy various criteria related to different driving forces, which are also likely to vary in strength over time. Hence, what looks like goal-directed action emerges from, and represents an attempt to satisfy multiple constraints with different origins, purposes, operational characteristics, and timescales—which among other things does not guarantee a high degree of coherence or rationality of the eventual outcome. GOALIATH calls for a radical break with conventional theorizing about the control of goal-directed behavior, as it among other things questions existing cognitive-control theories and dual-route models of action control.


2006 ◽  
Vol 1 (3) ◽  
pp. 81-92
Author(s):  
Zoohan Gani ◽  
Mark Toleman

This paper presents research on the influence that organisational behaviour and workplace culture have on the success of and barriers faced by adopting telework within the B2C e-business context among organisations in Australia, Singapore and American based organisations in Singapore. This qualitative study used interview methods to determine success factors and barriers in adopting telework. A total of 16 participants were interviewed in the study and the outcomes highlight differences in the work-related values according to the respective cultural backgrounds of managers and employees. These findings create new possibilities for research on how telework success and barriers to success are perceived since a major existing limitation of the telework literature is that organisational theory has been largely ignored.


Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2136
Author(s):  
Karl Sohlberg

Extraction of hydrogen from hydrocarbons is a logical intermediate-term solution for the escalating worldwide demand for hydrogen. This work explores the possibility of using a single membrane to accomplish both the catalytic dehydrogenation and physical separation of hydrogen gas as a possible way to improve the efficiency of hydrogen production from hydrocarbon sources. The present analysis shows that regions of pressure/temperature space exist for which the overall process is thermodynamically spontaneous (ΔG < 0). Each step in the process is based on known physics. The rate of hydrogen production is likely to be controlled by the barrier to hydrogen abstraction, with the density of H-binding sites also playing a role. A critical materials issue will be the strength of the oxide/metal interface.


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