120 research outputs found
Redding crew portrait, 1978
No full textA group picture of the crew for the Redding Smokejumper Base.
Back Row: (standing) Jim Eakin, Skip Alderson. Kev Hodgin, Gary Schneegas, Mike Spurlock, Doug Whitcomb, Tim Pettitt, Monty Wilburn, Rob Early, Dennis Golik
Middle Row: (standing) Gary Johnson, Mark Kroger, Chuck Greer, Mike Nielson, John Bald, John Newman, Ken Perkins, Greg Zschaechner, Ralph Ryan, Craig Irvine, Rick Elefant, Bob Harris, Steve Meyer, Dick Linebarger, Bill Kroger, Dave Noble
Front Row: (kneeling) Doug Tilden, Bill Rolls, Tim Huntington, Tom Murphy, Don Jones, Arlen Cravens, Ron Omont, Larry Hartgrave, Tom Hunnicut, Ed Strong, Dennis Custer, Toni Osa, Dick Tracy, Dave Nani, Don Sterret
Not Pictured: Buster Kleinhttps://dc.ewu.edu/nsa_crewpics/1431/thumbnail.jp
Fungal-microbial interactions impacting the physico-chemical and structural integrity of concrete
No full textFilamentous fungi are prevalent in concrete environments, impacting its physico-chemical properties and leading to either fungal-induced deterioration (FID) or self-healing. These opposing effects are facilitated by the unique mycelial structure of fungi, which penetrate the concrete matrix to acquire and transport organic resources and nutrients, as well as their ability to secrete organic acids. Preventing FID and enhancing self-healing are crucial for reducing maintenance costs and promoting sustainable construction materials. This study examined the effects of three common fungal strains in building environment — Aspergillus niger, Cladosporium sphaerospermum, Fusarium oxysporum, and environmental isolates of A. niger and F. oxysporum, on the microstructural properties of mortar, and the chemical (focussing on oxalic acid) and physical mechanisms influencing FID and self-healing of different mortar types and under different environmental conditions.
Aspergillus niger produced oxalic acid, forming a large quantities of bipyramidal calcium oxalate dihydrate (COD) crystals and their large size of aggregates that expand and, coupled with hyphal penetration, cause progressive FID of the mortar outer layers. In contrast, FID induced by C. sphaerospermum is milder, mainly discoloration from melanin release and minor surface spalling due to oxalic or citric acid production. In contrast, F. oxysporum generated tubular-like precipitates and bipyramidal-prism crystals of COD, which, combined with fungal hyphae, filled mortar pores and cracks, promoting self-healing by increasing the mortar mass and reducing mortar porosity. Among all mortar and environmental condition treatments, reducing the water/cement ratio limited FID and increased self-healing processes to the greatest extent, while, the soil environment promoted the most aggressive FID and inhibited self-healing.
This study is the first to identify aggregates of bipyramidal COD and singular bipyramidal-prism COD crystals in mortar samples due to the microstructural effects of filamentous fungi, and the contrasting roles of oxalic acid in FID and self-healing of concrete is first reported.Open Acces
The emergence of sustainability culture and the sustainability practitioner
No full textIn this thesis, I propose that sustainability is a new emergent cultural phenomenon – a new “dreaming” - arising from our conscious and unconscious actions, our relationships and our connection to place. Such a culture of sustainability is essential to support the vision of a sustainable global society. I further propose that the way sustainability is practised, both personally and professionally, has significant potential for fostering the emergence of sustainability culture, and that a mature sustainability culture, in turn, will support our myriad actions towards sustainability. The above propositions have a significant caveat: emergence, as understood in complexity theory, is not predictable. The current unsustainable paradigm of global development is also an emergent phenomenon. Real sustainability is therefore not inevitable, simply because a vision has been articulated, and strategies and actions implemented.
I also contend that as sustainability is holistic in conception, it requires a holistic approach to practice, in addition to the mechanistic prescriptions common to much contemporary sustainability practice. To move towards a holistic approach to practice requires a different type of practitioner from the conventional practitioner: more generalist than specialist, drawing on their “inner sustainability culture” when faced with complex sustainability problems, capable of working across scales, open to discovery of new patterns, and mindful of the degree of complexity in any practice setting.
In recognition of the need for a new cultural paradigm of sustainability, and drawing on the concept of emergence as described by complexity theory, I have designed this research project to investigate the following four themes:
1. Culture as an emergent quality of complex adaptive socio-technical systems;
2. The connections between human action and emergent system qualities;
3. The prospects for the emergence of a culture of sustainability; and
4. The implications of emergent sustainability culture for the sustainability practitioner.
In this thesis, I argue that we need a model of sustainability culture that accommodates the emergence phenomenon and new ways of emergence-based sustainability practice. I therefore propose an Emergence Model of Sustainability Culture to illustrate the relationship between sustainability, culture and the emergence phenomenon, and I articulate four Emergence Patterns for Sustainability Practice as a working framework for emergence-oriented sustainability practice across different generic practice settings in simple, complicated, complex and chaotic space. I hope that sustainability practitioners will find my Emergence Model and Emergence Patterns to be helpful in progressing to a more considered and deeper approach to sustainability practice than contemporary approaches, especially where sustainability problems are complex and difficult. In this way we may continue to develop a culture of sustainability as a new “dreaming” and the practice of sustainability will progress further to service humanity’s compelling need
Redding crew portrait, 1984
No full textA group picture of the crew for the Redding Smokejumper Base.
Back Row: (standing) Tim Pettitt, Buzz Teter, Bill Frost (pilot), Ray Searcy (pilot), Dan Emry
Middle Row: (standing) Stan Jones, Arlen Cravens, John Barker, Gordon Woodhead, Scott Brockman, Tony Loughton, Dave Nani, Tim Quigley, Ralph Ryan, Diane Pryce, Dan Mitchell, John Bald, Jerry Zumalt, Steve Meyer, Nick Holmes, Dave Noble
Front Row: (kneeling) Joe Wilkins, Gary Sexton, Mark Youmans, Rick Haagenson, Al Foley, Ron Omont, Bob Harris, Bill Newlun, Jim Gerber, Gary Johnson, Don Sand, Tim Huntington, Andy Thorne Not Pictured: Chris Palmer, Gary Schneegas, Rob Early, Norm Baker, George Masen, Ken Malley, Ken Perkins, Omar Roos, Doug Swatner, Don Sterret, Roger Archibald, Kevin Hodginhttps://dc.ewu.edu/nsa_crewpics/1437/thumbnail.jp
Redding crew portrait, 1977
No full textA group picture of the crew for the Redding Smokejumper Base.
Back Row: (standing) Bob Kersh, Brenda Turner, Fred Fuchs, Mike Nielson, Rob Bennetts, Tim Huntington, Dave Noble, John Williamson, Ted Moore, Kev Hodgin, Mike Gutierrez, Tim Riffel, Tim Pettitt, Bill Frost (pilot), Chris Palmer, Dave Schas, Kent harper, Bill Kroger, Dave Nani, Don Sterret, Bob Totten
Middle Row: (kneeling) Mark Kroger, Charlie Robinson, Larry Darling, Bob Early, Steve Slate, Ken perkins, John Tice, Larry Hartgrave, Steve Eckert, Greg Zschaechner, Ed Strong, Craig Irvine, Bob Harris, Roscoe Rowney, Buster Klein
Front Row: (sitting) Chuck Greer, Gary Johnson, Jim Thomason, Ralph Ryan, Walt Robinson, Steve Ingraham, Ronny Ramirez, Doug Whitcomb, Jim Howard, Rick Elefant, Dick Linebarger, Bill Cady, Jerry Martinez, Dick Tracy Not Pictured: Monty Wilburn, A. Agosta, F. Knowles, S. Lederer, Pat O’Bannonhttps://dc.ewu.edu/nsa_crewpics/1430/thumbnail.jp
Comparative analysis of nonparametric change-point detectors commonly used in hydrology
No full textSeveral commonly-used nonparametric change-point detection methods are analysed in terms of power, ability and accuracy of the estimated change-point location. The analysis is performed with synthetic data for different sample sizes, two types of change and different magnitudes of change. The methods studied are the Pettitt method, a method based on the Cramér von Mises (CvM) two-sample test statistic and a variant of the CUSUM method. The methods differ considerably in behaviour. For all methods the spread of estimated change-point location increases significantly for points near one of the ends of the sample. Series of annual maximum runoff for four stations on the Yangtze River in China are used to examine the performance of the methods on real data. It was found that the CvM-based test gave the best results, but all three methods suffer from bias and low detection rates for change points near the ends of the series.Water Resource
Analysis of the impact of conservation measures on stream flow regime in catchments of the Loess Plateau, China
No full textCatchments in the Loess Plateau have been under the influence of human activities for centuries. In the last four decades, soil conservation measures have accelerated and intensified. These measures were designed to reduce soil erosion, improve agricultural productivity, and enhance environmental quality. It is important to evaluate the effects of these measures on hydrology in order to develop sustainable catchment management plans in the region. This study evaluated changes in stream flow data for four selected catchments in the Loess Plateau following large-scale soil conservation measures. The non-parametric Mann-Kendall test was used to identify trends in annual stream flow and the results showed significant downward trends in three of the four catchments. The Pettitt test indicated that a change point occurred in 1978 in these three catchments. Annual precipitation in all the catchments showed no significant trend during the period of record. Comparison of daily flow duration curves for two 20-year periods (1957-1978) and (1979-2003) showed significant changes in stream flow regime. Reduction in most percentile flows varied between 20 and 45%, and the reduction in low flows was greatest. Overall, the reductions in daily flow were increasing with time, with significant changes occurring in the 1990s. However, it is not clear whether these catchments have seen the full effects of the soil conservation measures, so the results of this study might underestimate the final impact of soil conservation on stream flow regime. Copyright (c) 2007 John Wiley & Sons, Ltd
Boise crew portrait, 1999
No full textA group portrait of the smokejumper crew for the Boise Smokejumper Base. Front row: Erik Hipke, Joel, Gosswilller, Davis Zuares, Alli Cushman, Erik Walker, Emil Magallanes, Billy Lee Rickard, Dave Vining, Erik Reynolds, Walt Wasser, George Steele, Tom Romanello, Tom Caughlin. Middle row: Dave Russel (pilot), Bill Werhane (WYS), Jerry Drazinski, Joel Kerley, Dennis Terry, Steve Price, Todd Jenkins, Matt Bowers, Tim Schaeffer, Bill Birmingham, Shannon Orr, Hector Madrid, Rich Zimmerlee, Kenny Franz. Back row: Mike Tupper, Scott Salisberry, Darryl Wittke, Todd Johnson, Phil Brollier, Brad Sauer, John Kawczinski, Mike Burin, Rhonda Steinman, John Curd, Greg Anderson (WYS), Tim Pettitt, Tony DeMasters, Mimi Scissons, Lee Svobada (pilot), Brent Johnson, Brady Collins, Bell Steck (pilot), Dan Arnold, Jim Olson, Neal Person, Bud Derham, John Hawkins, Bob Hurley, Kasey Rose, George Matthews (pilot), Sean Cross, Trent Hamilton. Not pictured: Marty Adell, Grant Beebe, Dave Estey, Jason Hofman, Ted Mason, Mark Motes, Chris Palmer.https://dc.ewu.edu/nsa_crewpics/1257/thumbnail.jp
(Re)thinking racial identity through difference
No full textThis thesis was scanned from the print manuscript for digital preservation and is copyright the author.
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