High Density Jet Fuel Availability Study. Phase 1. Refining Industry Survey

1987 ◽  
Author(s):  
F. P. Frederick
2021 ◽  
pp. 004723952110160
Author(s):  
Kristen L. Granger ◽  
Maureen A. Conroy ◽  
Kevin S. Sutherland ◽  
Edward G. Feil ◽  
Jessica Wright ◽  
...  

The purpose of this article is to describe the adaptation process of an evidence-based early childhood Tier-2 intervention program, BEST in CLASS-Prekindergarten, from a face-to-face format to a web-based delivery format called BEST in CLASS-Web. We describe the three-phase iterative development process used to adapt the parent program for delivery via the web. Activities in these phases included focus groups, interviews, an expert panel review, alpha and beta testing (Phase 1), feasibility testing (Phase 2), and a pilot promise study (Phase 3). Each phase included a series of refinements and improvements to materials based on data and stakeholder feedback. Lessons learned and implications for developing and implementing professional development services via online platforms are discussed.


2021 ◽  
Author(s):  
◽  
Loc Tan Nguyen

<p>Recent years have seen increasing research interest in the teaching of pronunciation in English as a second/foreign language classes (Thomson & Derwing, 2014), with particular strands of this research focused on understanding how pronunciation is represented in instructional materials and actual teaching practices in a range of settings and in teacher cognition (e.g., Couper, 2017; Derwing, Diepenbroek, & Foote, 2012; Foote, Trofimovich, Collins, & Urzúa, 2016). The study reported in this dissertation extends this research by investigating pronunciation teaching in a context where it has hitherto been under-researched, namely tertiary EFL in Vietnam.  The research involved two phases. Phase 1 was an introductory situation analysis which investigated pronunciation teaching practices of six Vietnamese tertiary EFL teachers teaching six intact classes at a Vietnamese university. First, the representation of pronunciation features in prescribed textbooks and supplementary materials of the EFL programme were analysed. Six ninety-minute lessons (one from each of the teachers) were then observed, and the teachers and 24 students across the six groups interviewed. The teacher interviews included both stimulated recall and general questions probing their beliefs about pronunciation teaching. Students were interviewed in focus groups (four each) regarding their teachers’ pronunciation teaching and their own pronunciation needs. The focus of Phase 1 was on how the teachers taught pronunciation, the factors shaping their pedagogical choices, and the students’ beliefs about their teachers’ pronunciation teaching and their instructional needs. The findings revealed that pronunciation was largely absent from course books and curriculum documents and that the teachers’ beliefs were in contrast with what they actually did in class. The teachers reported that they would follow deliberate steps if they taught pronunciation explicitly such as listening discrimination followed by explaining places of articulation and then practice. However, in the observed lessons, they only corrected their students’ pronunciation errors through recasts and/or prompts, with little if any explicit or pre-planned pronunciation teaching. In the interviews, the teachers confirmed that they never used any other techniques and that this was typically the only way they taught pronunciation in class.  The teachers’ pronunciation teaching was textbook-driven and was shaped by contextual factors including the curriculum and the learners. Decision making by all the teachers reflected a general commitment to strictly follow the mandated curriculum, with little evidence of pronunciation being taught explicitly. All the teachers reported a lack of initial training and professional learning in pronunciation pedagogy. In addition, there was a mismatch between the teachers’ and students’ preferences and beliefs about pronunciation teaching. Whereas the teachers believed error correction through recasts and/or prompts was effective, the students did not, and expressed a strong need for more explicit, communicative teaching of pronunciation. This pronunciation instructional need and the teachers’ lack of initial training and PL in pronunciation pedagogy motivated the Phase 2 study.  Phase 2 was an intervention study conducted with the same teachers teaching different classes. At the beginning of Phase 2, the teachers attended a teacher professional learning (TPL) workshop in which they were introduced to a pedagogic framework for teaching English pronunciation communicatively proposed by Celce-Murcia, Brinton, & Goodwin (2010). The teachers then planned communicative pronunciation teaching (CPT) lessons using this framework, and were subsequently observed implementing these lessons in their classes. Both the workshop and subsequent classes of this phase were audio-video recorded. A total of seven lesson plans and 24 classroom observations were made across the six teachers (four observations each). Right after the classroom observations, the teachers were interviewed to obtain their views of the TPL workshop and their implementation of the CPT lessons. Twenty-four students across the six groups were interviewed to reflect on their experience with the CPT lessons.  Observational data showed that the teachers understood and were able to translate what they learned about CPT from the workshop into actual classroom practice as reflected in their lesson planning and subsequent teaching. The lesson plans designed by the teachers closely followed the principles of the communicative framework. Interview data showed that the CPT model was favoured by both teacher and student participants. On the basis of the teachers’ implementation of the CPT lessons, both the teachers and students were confident that CPT has the advantages for promoting learners’ pronunciation knowledge, fostering their phonological ability, and developing their oral communication skills. They also reported that CPT can arouse learners’ interest and engagement in classroom learning.  Taken as a whole, this research highlights the need for pronunciation to be given a more explicit place in teaching and learning in tertiary EFL programmes in Vietnam, and for teachers to be better equipped for teaching pronunciation. Findings from interviews with teachers and learners in the study suggest that they would be receptive to such changes.</p>


2018 ◽  
Vol 2 (8) ◽  
pp. 1863-1869 ◽  
Author(s):  
Jiawei Xie ◽  
Lei Zhang ◽  
Xiangwen Zhang ◽  
Peijuan Han ◽  
Junjian Xie ◽  
...  

Biofuels synthesized from lignocellulose-derived platform chemicals are very attractive for sustainable development.


1965 ◽  
Author(s):  
AUERBACH CORP PHILADELPHIA PA
Keyword(s):  
Phase 1 ◽  

2019 ◽  
Vol 7 (4) ◽  
pp. T857-T867 ◽  
Author(s):  
Mei Liu ◽  
Irina Filina ◽  
Paul Mann

We have investigated the crustal structure of a 400 km wide zone of thinned continental crust in the northeastern Gulf of Mexico (GOM) using gravity and magnetic modeling along two deeply penetrated seismic transects. Using this approach, we identify two zones of prominent, southward-dipping reflectors associated with 7–10 km thick, dense, and highly magnetic material. Previous workers have interpreted the zones as either coarse clastic redbeds of Mesozoic age that are tilted within half-grabens or seaward-dipping reflectors of magmatic origin. Both seismic reflection lines reveal a 10 km thick and 67 km wide northern zone of high density near the Florida coastline beneath the Apalachicola rift (AR). The southern zone of high density occurs 70 km to the south in the deepwater central GOM along the northern flank of the marginal rift, a 48 km wide, southeast-trending structure of inferred Late Jurassic age that is filled by 3 km of low-density and low-magnetic susceptibility sediments including complexly deformed salt deposits. We propose that these two subparallel rifts and their associated magmatic belts formed in the following sequence: (1) AR formed during Triassic-early Jurassic (210–163 Ma) phase 1 of diffuse continental stretching and was partially infilled on its northern edge by southward-dipping volcanic flows; and (2) the similarly southward-dipping southern magmatic zone formed adjacent to the marginal rift during the early phase 2 of late Jurassic (161–153 Ma) rifting of the GOM continental extension; this southern area of SDR formation immediately preceded the formation of the adjacent oceanic crust that separated the rift-related evaporates into the northern and southern GOM. Our integrated approach combining 2D seismic, gravity, and magnetic data sets results in a more confident delineation of these deep crustal features than from seismic data alone.


2019 ◽  
Vol 21 (14) ◽  
pp. 3789-3795 ◽  
Author(s):  
Hao Tang ◽  
Yancheng Hu ◽  
Guangyi Li ◽  
Aiqin Wang ◽  
Guoliang Xu ◽  
...  
Keyword(s):  
Jet Fuel ◽  

Jet fuel range high-density C13–C15 cycloalkanes were first synthesized at a high overall yield (∼80%) with polycarbonate waste.


2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Alexis Ogdie ◽  
W. Benjamin Nowell ◽  
Eddie Applegate ◽  
Kelly Gavigan ◽  
Shilpa Venkatachalam ◽  
...  

Abstract Background There are limited real-world data on the diagnostic experiences of patients with psoriatic arthritis (PsA), including medical care sought and potential barriers to diagnosis. We aim to describe patient experiences related to receiving a PsA diagnosis. Methods Ours was a mixed-method, 2-phase study. Phase 1 comprised concept elicitation and cognitive interviews with clinical experts and adults diagnosed with PsA to develop a cross sectional, web-based survey. US adults with a self-reported PsA diagnosis were recruited through a patient support community (CreakyJoints), an online patient research registry (ArthritisPower), and social media outreach. In Phase 2, the online survey collected data on sociodemographics, clinical symptoms, disease burden, and diagnosis history of survey respondents with PsA. Results Of the 203 respondents included, 172 (84.7%) were female, and the mean (SD) age was 51.6 (10.8) years. The time between seeking medical attention and receiving a diagnosis was < 6 months for 69 respondents, 6 months to 4 years for 68 respondents, and ≥ 5 years for 66 respondents. Most respondents sought care from general practitioners (79.8%) and rheumatologists (66.5%). Common initial symptoms that led respondents to seek medical attention were joint pain (70.0%) and stiffness (53.7%). Among the initial symptoms that led respondents to seek care, joint pain, swollen joints, and sausage-like fingers or toes (indicating dactylitis) were more common among respondents with shorter time to diagnosis, whereas stiffness, fatigue, enthesitis (indicated by foot problems, tendon and ligament pain), and back pain were more common among respondents with longer time to diagnosis. Common misdiagnoses were psychosomatic issues (26.6%) and osteoarthritis (21.7%). Respondents with shorter times to diagnosis had lower frequencies of misdiagnosis. Conclusions Respondents with PsA reported delays in diagnosis and misdiagnoses on their journey to a PsA diagnosis. Symptom differences, such as enthesitis and stiffness, were noted among respondents with shorter vs longer time to diagnosis. Increased understanding of diagnostic barriers may lead to earlier diagnosis and appropriate management to improve outcomes.


2003 ◽  
Vol 29 (12) ◽  
pp. 787-793 ◽  
Author(s):  
S FRIEDMAN ◽  
S ABITBOL ◽  
H LAWRENCE

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