123,181 research outputs found
Pickering, James D., March 13, 1995 [Interview]
No full textProfessor of English and former Dean James D. Pickering was interviewed on March 13, 1995, by Michael Birkner about his career at Gettysburg College, including memories of colleagues, classes, and students.Langsam, Walter C.; Mason, Francis C.; Geyer, Richard B.; Lindeman, Ralph D.; Pickering, Anne; Bloom, Robert L.; Crapster, Basil L.; Glatfelter, Charles H.; Mara, Richard T.; Barnes, Robert D.; Sundermyer, William K.; Warthen, George S.; Wolfinger, Joseph K.; Baskerville, Edward J.; Hanson, Henry W.A.; Paul, Willard S.; Hartzell, Mildred H.; Zagars, Waldemar; Tilberg, Wilbur E.; Dunn, Seymour B.; Shainline, John W.; Storek, Martha; Jones, W. Ramsey; Frying, Robert H.; Rice, John S.; Ziegler, Earl E.; Schubart, W. Richard; Bream, Henry T.; Kramer, Frank H.; Bowen, Earl; Zinn, John B.; Held, C. Robert; Ahrens, Frederick C.; Hinrichs, Donald W.; Packard, Bruce L.; Glassick, Charles E.; Williams, Frank B.; Hoffman, F. Stanley; Potts, David B.; Taylor, Katherine K.Walter C. Langsam Years; Willard S. Paul Years; Carl Arnold Hanson Years; Charles E. Glassick Year
Impacts of hunter-gatherers on the vegetation history of the eastern vale of pickering, Yorkshire
No full textResearch is undertaken into the vegetation and human impact at three previously un-researched archaeological sites from the eastern Vale of Pickering. The vegetation history is reconstructed from the end of the Windermere Interstadial c. 13,000 (^14)C yr BP until the final Mesolithic c. 5100 (^14)C yr BP. The early Mesolithic human impact on the vegetation is assessed using a three stage statistical test to establish the internal variability in the data as well as background variations in pollen output. The results reveal that humans had a small but significant impact on the vegetation around two of the sites. Pollen preservation at the third site precluded analyses of the impacts of humans on the vegetation. The three-stage test used to test for human impact was quite successful but requires revision before any further use. On the whole the tests confirmed the findings of conventional human impact analyses. During the pre-Holocene fires occurred on a regular basis. These fires varied in location and intensity, suggesting that some of the fires were regional or large-scale, whilst others were small and very localized. A multi-causal explanation has been given for the fires. Later, during the early Mesolithic, human groups are thought to have burnt the reedswamp at the lake edges as part of an economic strategy. Star Carr is the only site that demonstrates clearance of significant areas of woodland. During the later Mesolithic the hunter-gatherers have a greater impact on the vegetation within the Vale. This is attributed to the need for more resources as a result of vegetation change and increased population levels. Unlike their counter-parts from the North York Moors, the occupants of the lowland Vale of Pickering cause no long-term change to their environment
AAC users' discourse in the workplace
No full textA number of attempts have been made to capture the discourse of AAC users (Beukelman, et al.
1984; Vertanen & Kristensson, 2011) but only one corpus exists that explicitly focusses on the
language of AAC users and non-AAC users in the workplace. In this chapter, we will discuss the
work that has been done to describe AAC users’ discourse and research conducted using the
AAC and non-AAC workplace corpus (ANAWC) (Pickering & Bruce, 2009). This work has
shown that AAC users often prefer to vocalize instead of using their devices in interaction in
order to inhabit the same “time stream” as their interlocutors (Bouchard, 2016; Friginal,
Pickering & Bruce, 2016). We expand this work and compare the speech produced by AAC
users while using their devices and when vocalizing. The data from the ANAWC are
separated in two sub corpora: one that includes all the vocalizations made by the AAC users, and
one that includes all the speech produced using their devices. These sub corpora are analyzed
quantitatively, looking at word frequency and word clusters, and qualitatively, focusing on the
situations when the speakers vocalize or use their devices. This advances our understanding
of the discourse of AAC users in the workplace in a way that would not be possible without the
use of corpora
Diffusion across particle-laden interfaces in Pickering droplets
No full textEmulsions stabilized by nanoparticles, known as Pickering emulsions, exhibit remarkable stability, which enables applications ranging from encapsulation, to advanced materials, to chemical conversion. The layer of nanoparticles at the interface of Pickering droplets is a semi-permeable barrier between the two liquid phases, which can affect the rate of release of encapsulates, and the interfacial transfer of reactants and products in biphasic chemical conversion. A gap in our fundamental understanding of diffusion in multiphase systems with particle-laden interfaces currently limits the optimal development of these applications. To address this gap, we developed an experimental approach for in situ, real-time quantification of concentration fields in Pickering droplets in a Hele-Shaw geometry and investigated the effect of the layer of nanoparticles on diffusion of solute across a liquid–liquid interface. The experiments did not reveal a significant hindrance on the diffusion of solute across an interface densely covered by nanoparticles. We interpret this result using an unsteady diffusion model to predict the spatio-temporal evolution of the concentration of solute with a particle-laden interface. We find that the concentration field is only affected in the immediate vicinity of the layer of particles, where the area available for diffusion is affected by the particles. This defines a characteristic time scale for the problem, which is the time for diffusion across the layer of particles. The far-field concentration profile evolves towards that of a bare interface. This localized effect of the particle hindrance is not measurable in our experiments, which take place over a much longer time scale. Our model also predicts that the hindrance by particles can be more pronounced depending on the particle size and physicochemical properties of the liquids and can ultimately affect performance in applications.ChemE/Transport Phenomen
Emerging Applications of Pickering Emulsions in Pharmaceutical Formulations: A Comprehensive Review
No full textXingyue Wang, Na Tian, Lili He, Zhixiang Yuan, Lu Han College of Pharmacy, Southwest Minzu University, Chengdu, 610041, People’s Republic of ChinaCorrespondence: Lu Han, Email [email protected]: Over the past two decades, particle-stabilized Pickering emulsions (PEs) have emerged as a versatile platform in pharmaceutical formulations, demonstrating distinct advantages over surfactant-based systems through enhanced stability, reduced toxicity, and tunable interfacial properties. These systems exhibit unique drug delivery potential through their precisely controllable architecture, particularly in achieving spatiotemporal drug release patterns, tissue-specific targeting, and enhanced therapeutic payload encapsulation. In this review, the characteristics of PEs are first detailed, followed by an introduction to the main preparation methods and the key parameters for controlling the type, droplet size, and stability of PEs. The third section categorizes and discusses the advantages and disadvantages of various solid particles as emulsifiers. Lastly, emphasis is placed on the application of PEs in the pharmaceutical field, including functionalized designs and various administration routes to enlighten the rational design of PEs for effective drug delivery.Keywords: Pickering emulsions, drug delivery, solid particle emulsifiers, controlled releas
An introduction to the ANAWC. The AAC and Non-AAC Workplace Corpus
No full textThis paper presents an overview of the Augmentative and Alternative Communication (AAC) and Non-AAC Workplace Corpus (ANAWC) (Pickering & Bruce, 2009). The corpus is the first resource of its kind that makes it possible to systematically study the typical language patterns of both AAC users and comparable non-AAC users in the workplace. We discuss the origin of the corpus and give an account of the methodology used for its collection and transcription. We also introduce several publications that demonstrate the novel qualitative and quantitative findings that can be generated on the basis of the corpora. This kind of research will be crucial to guide future developments in AAC development for workplace applications
4D printing of Pickering emulsion: Temperature-driven color changes
No full textPickering emulsion inks were employed to demonstrate the temperature-driven 4D printing method. The Pickering emulsion consisted of water phase containing NaHCO3 and oil phase containing curcumin. Upon heating, the movement of pigment molecules was induced, resulting in color changes. The formation mechanism, rheological properties, printing properties and color changes of Pickering emulsion as well as the release kinetic mechanism of curcumin were investigated. The results indicated that relationships were also established between quantified color values (L*, a*, b*) and heating time. Moreover, the release of the curcumin in the Pickering emulsion, which was designated as a swelling process, followed the non-Fickian mechanism due to the occurrence of diffusion and erosion. The Hixson-Crowell model exhibited the highest linearity (R2: 0.9430 to 0.9825) of Pickering emulsions. In conclusion, the research offers a new perspective for the development of personalized Pickering emulsion food with bright colors
Linguistic characteristics of AAC discourse in the workplace
No full textThis study examines linguistic co-occurrence patterns in the discourse of individuals with communication impairments who use augmentative and alternative communication (AAC) devices in the workplace by comparing them to those of non-AAC users in similar job settings. A typical workweek (≈ 40 hours) per focal participant (four AAC; four non-AAC) was recorded and transcribed to create a specialized corpus of workplace discourse of approximately 464,000 words at the time of this analysis. A multidimensional analysis of co-occurrence patterns along functional linguistic dimensions, following Biber (1988, 1995) [Variation across Speech and Writing. Cambridge: Cambridge University Press; Dimensions of Register Variation: A Cross-Linguistic Perspective. Cambridge: Cambridge University Press], reveals differences in the macro discourse characteristics of AAC vis-a-vis non-AAC texts. Results indicate that AAC texts make use of more informational, non-narrative, and explicit textual features of discourse than their non-AAC counterparts. Implications to improve the capabilities of AAC devices to produce speech that matches baseline expectations of co-workers in the workplace are discussed. © The Author(s) 2013
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