In Situ Burning Wave Tank Tests at Prudhoe Bay, Alaska1

1999 ◽  
Vol 1999 (1) ◽  
pp. 1269-1272
Author(s):  
Ian Buist ◽  
James McCourt ◽  
Joseph V. Mullin ◽  
Nick W. Glover ◽  
Charlene Hutton ◽  
...  
Keyword(s):  
Open Water ◽  
North Slope ◽  
Experimental Program ◽  
New Wave ◽  
Wave Tank ◽  
Burning Wave ◽  
Surface Active ◽  
Prudhoe Bay ◽  
And Training

ABSTRACT A series of research burns was carried out in the fall of 1997 in Prudhoe Bay, Alaska, in a new wave tank purpose-built for oil spill research and training. These tests were the culmination of a 3-year research project by Alaska Clean Seas (ACS) and S.L. Ross into the effects of oil type, emulsification, temperature and waves on in situ burning in Arctic open water conditions. The 1997 experimental program involved conducting mid-scale burns with fresh and weathered Alaska North Slope (ANS) and Milne Pt. crude oils and emulsion slicks in waves, including tests involving the addition of emulsion breakers. Emulsion breakers are surface active chemicals which are added at very low dosages (1:500 to 1:5000) to petroleum emulsions to promote separation of the emulsion into discrete oil and water phases.

IN SITU BURNING OF ALASKA NORTH SLOPE EMULSIONS

1995 ◽  
Vol 1995 (1) ◽  
pp. 139-146 ◽  
Author(s):  
Ian A. Buist ◽  
Nick Glover
Keyword(s):  
Crude Oil ◽  
Water Content ◽  
Laboratory Scale ◽  
North Slope ◽  
Small Scale ◽  
Oil Removal ◽  
Prudhoe Bay ◽  
Water Contents ◽  
Meso Scale

ABSTRACT The onset of water-in-oil emulsion formation in an oil slick often signals the closing of the window of opportunity for in-situ burning as a countermeasure. Water contents in excess of 25 percent in a stable emulsion generally preclude ignition of the slick. A study of in-situ burning of water-in-oil emulsions formed by weathered Alaska North Slope (ANS) crude oil has recently been completed by Alaska Clean Seas. The study consisted of three phases: laboratory-scale burns in Ottawa in a 0.13 m2 burn ring, small-scale burns in Prudhoe Bay in 1.2 m2 and 3.3 m2 pans, and meso-scale burns in a 69 m2 circle of 3M Fire Boom in a water-filled pit at Prudhoe Bay. The laboratory-scale tests showed that stable, weathered ANS crude emulsions could be ignited in-situ using conventional gelled fuel igniters only up to a water content of 25 percent. The combination of adding an oilfield emulsion breaker, Petrolite EXO 0894, and the use of gelled crude oil as an alternate igniter fuel, permitted ignition and efficient combustion of weathered ANS emulsions with water contents of 65 percent, the maximum achievable. The small-scale pan tests conducted in Prudhoe Bay proved the same: that normally unignitable emulsions of weathered ANS crude, up to 65 percent water content, could be successfully ignited and efficiently burned outdoors at 0° to 5°C in winds up to 32 km/h with the application of EXO 0894 one hour prior to ignition. Tests with the Helitorch igniter system suspended from a crane showed that a mixture of gelled gasoline and crude oil was the most effective ignition fuel for the emulsions. Attempts were made to ignite emulsion slicks with gelled igniter fuels containing the emulsion breaker; but this technique did not prove as effective as pre-mixing the breaker into the slick. These tests also indicated that the emulsion burns produced a lighter smoke than that from crude oil. Three meso-scale experimental burns were carried out: one involved approximately 13 m3 (80 bbl) of fresh ANS crude as a baseline; one used about 8 m3 (50 bbl) of a stable 50 percent water-in-weathered crude emulsion; and, the final burn was done with 17 m3 (105 bbl) of stable 60 percent water content emulsion. The oil removal efficiency for the fresh crude oil burn was approximately 98 percent. The oil removal efficiencies for the 50 and 60 percent water emulsions were 97 and 96 percent respectively.

scholarly journals The Vocational School of Sintra and Its Contribution to Heritage Education

Heritage ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 466-478
Author(s):  
Ana Mafalda Cardeira ◽  
Marta Frade
Keyword(s):  
Cultural Heritage ◽  
Educational System ◽  
Analytical Methods ◽  
Vocational School ◽  
Work Related ◽  
Heritage Education ◽  
12Th Grade ◽  
And Training

This paper aims to share the experience acquired with students of the 3rd year (namely the 12th grade of the Portuguese educational system) at the Vocational School for the Recovery of Heritage of Sintra in the Course of Studies for Conservation and Restoration Assistants in the field of Plaster Restoration, in the classes of Work-Related Training and Analytical Methods of Examination and Laboratory Analysis, by carrying out theoretical-practical work and training in a work context specifically focused on Portuguese heritage, demonstrating how practical classes motivate students and prepare them for future professional work. This vocational course helps students to reflect and question themselves on the role of “looking” at heritage. Thus, its cross information, both interdisciplinary and from the historical-artistic context of the monument, will provide a better perspective over its materiality and its use. In situ learning awakens students to the reality of work. The notion that they are helping to maintain the memory of ancestors credits them and gives them confidence in their work. After presenting their Final Year Projects, they look at heritage with a more awakened vision. With this, they have the perception that they have contributed to the reconstruction of memory, their cultural heritage.

Naturalistic Decision Making in High Performance Team Sport Coaching

2015 ◽  
Vol 2 (2) ◽  
pp. 152-168 ◽  
Author(s):  
Stephen Harvey ◽  
John William Baird Lyle ◽  
Bob Muir
Keyword(s):  
Decision Making ◽  
High Performance ◽  
Recent Literature ◽  
Critical Factors ◽  
Naturalistic Decision Making ◽  
Problem Framing ◽  
Stimulated Recall ◽  
Suitable Framework ◽  
And Training

A defining element of coaching expertise is characterised by the coach’s ability to make decisions. Recent literature has explored the potential of Naturalistic Decision Making (NDM) as a useful framework for research into coaches’ in situ decision making behaviour. The purpose of this paper was to investigate whether the NDM paradigm offered a valid mechanism for exploring three high performance coaches’ decision-making behaviour in competition and training settings. The approach comprised three phases: 1) existing literature was synthesised to develop a conceptual framework of decision-making cues to guide and shape the exploration of empirical data; 2) data were generated from stimulated recall procedures to populate the framework; 3) existing theory was combined with empirical evidence to generate a set of concepts that offer explanations for the coaches’ decision-making behaviour. Findings revealed that NDM offered a suitable framework to apply to coaches’ decision-making behaviour. This behaviour was guided by the emergence of a slow, interactive script that evolves through a process of pattern recognition and/or problem framing. This revealed ‘key attractors’ that formed the initial catalyst and the potential necessity for the coach to make a decision through the breaching of a ‘threshold’. These were the critical factors for coaches’ interventions.

scholarly journals Integrating a FISH imaging system into the cytology laboratory

CytoJournal ◽  
2010 ◽  
Vol 7 ◽  
pp. 3 ◽  
Author(s):  
G. Denice Smith ◽  
Matt Riding ◽  
Kim Oswald ◽  
Joel S. Bentz
Keyword(s):  
Training Programs ◽  
Imaging System ◽  
Job Descriptions ◽  
Hard Drives ◽  
Financial Investment ◽  
Automated Scanning ◽  
Space Requirements ◽  
And Training

We have implemented an interactive imaging system for the interpretation of UroVysion fluorescence in situ hybridization (FISH) to improve throughput, productivity, quality control and diagnostic accuracy. We describe the Duet imaging system, our experiences with implementation, and outline the financial investment, space requirements, information technology needs, validation, and training of cytotechnologists needed to integrate such a system into a cytology laboratory. Before purchasing the imaging system, we evaluated and validated the instrument at our facility. Implementation required slide preparation changes, IT modifications, development of training programs, and revision of job descriptions for cytotechnologists. A darkened room was built to house the automated scanning station and microscope, as well as two imaging stations. IT changes included generation of storage for archival images on the LAN, addition of external hard drives for back-up, and changes to cable connections for communication between remote locations. Training programs for cytotechnologists, and pathologists/fellows/residents were developed, and cytotechnologists were integrated into multiple steps of the process. The imaging system has resulted in increased productivity for pathologists, concomitant with an expanded role of cytotechnologists in multiple critical steps, including FISH, scan setup, reclassification, and initial interpretation.

Application of an in Situ Growth Model: Inferred Instance of Interspecific Trophic Competition between Anadromous Fishes of Prudhoe Bay, Alaska

1995 ◽  
Vol 124 (1) ◽  
pp. 55-69 ◽  
Author(s):  
Robert G. Fechhelm ◽  
William B. Griffiths ◽  
James D. Bryan ◽  
Benny J. Gallaway ◽  
William J. Wilson
Keyword(s):  
Growth Model ◽  
In Situ Growth ◽  
Prudhoe Bay ◽  
Trophic Competition

scholarly journals Loop-Type Wave-Generation Method for Generating Wind Waves under Long-Fetch Conditions

2017 ◽  
Vol 34 (10) ◽  
pp. 2129-2139 ◽  
Author(s):  
Naohisa Takagaki ◽  
Satoru Komori ◽  
Mizuki Ishida ◽  
Koji Iwano ◽  
Ryoichi Kurose ◽  
...  
Keyword(s):  
Wind Wave ◽  
Wind Waves ◽  
Peak Frequency ◽  
Wave Generation ◽  
New Wave ◽  
Wave Tank ◽  
Irregular Wave ◽  
Wind Speeds ◽  
Type Wave ◽  
Wave Generator

AbstractIt is important to develop a wave-generation method for extending the fetch in laboratory experiments, because previous laboratory studies were limited to the fetch shorter than several dozen meters. A new wave-generation method is proposed for generating wind waves under long-fetch conditions in a wind-wave tank, using a programmable irregular-wave generator. This new method is named a loop-type wave-generation method (LTWGM), because the waves with wave characteristics close to the wind waves measured at the end of the tank are reproduced at the entrance of the tank by the programmable irregular-wave generator and the mechanical wave generation is repeated at the entrance in order to increase the fetch. Water-level fluctuation is measured at both normal and extremely high wind speeds using resistance-type wave gauges. The results show that, at both wind speeds, LTWGM can produce wind waves with long fetches exceeding the length of the wind-wave tank. It is observed that the spectrum of wind waves with a long fetch reproduced by a wave generator is consistent with that of pure wind-driven waves without a wave generator. The fetch laws between the significant wave height and the peak frequency are also confirmed for the wind waves under long-fetch conditions. This implies that the ideal wind waves under long-fetch conditions can be reproduced using LTWGM with the programmable irregular-wave generator.

scholarly journals The Use of Geogrids in Mitigating Pavement Defects on Roads Built over Expansive Soils

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Richard Shumbusho ◽  
Gurmel S. Ghataora ◽  
Michael P.N. Burrow ◽  
Digne R. Rwabuhungu
Keyword(s):  
Seasonal Changes ◽  
Expansive Soils ◽  
Expansive Soil ◽  
Real Field ◽  
Experimental Program ◽  
Swelling Potential ◽  
Swelling Behaviour ◽  
Wetting And Drying ◽  
Potential Benefits

This study was conducted to investigate the potential benefits of using geogrids in mitigating pavement defects notably roughness and longitudinal cracking on pavements built over expansive soils. The seasonal changes of expansive soils (periodic wetting and drying) cause detrimental effects on the overlying road pavements. Such detrimental behavior of expansive soils was simulated in a controlled laboratory environment through allowing cyclic wetting and drying of an expansive soil underlying a pavement section. The shrink/swell effects of the expansive soil subgrade were examined through monitoring its change in moisture, and measuring deformation of overlying pavement section. The experimental study suggested that a geogrid layer in a reinforced pavement section can reduce surface differential shrinking and swelling deformation resulting from underlying expansive soils by a factor of 2 and 3 respectively in comparison to unreinforced section. Given that an oedometer test which is typically used to predict swelling potential of expansive soils is known to overpredict in-situ soil swell, experimental program also investigated quantitatively the extent to which the oedometer can overestimate swelling behaviour of the real-field scenarios. It was found that oedometer percent swell can overpredict in-situ swelling behaviour of the expansive soil by a factor ranging between 2 and 10 depending upon the period over which the in-situ expansive soil has been in contact with water.

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