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Articles 1 - 25 of 25
Full-Text Articles in Physical Sciences and Mathematics
Giant Sequoia Insect, Disease, And Ecosystem Interactions, Douglas D. Piirto
Giant Sequoia Insect, Disease, And Ecosystem Interactions, Douglas D. Piirto
Douglas D. Piirto
Individual trees of giant sequoia (Sequoia gigantea [Lindl.] Decne.) have demonstrated a capacity to attain both a long life and very large size. It is not uncommon to find old-growth giant sequoia trees in their native range that are 1,500 years old and over 15 feet in diameter at breast height. The ability of individual giant sequoia trees to survive over such long periods of time has often been attributed to the species high resistance to disease, insect, and fire damage. Such a statement, however, is a gross oversimplification, given broader ecosystem and temporal interactions. For example, why isn't there …
Efficacy Of Herbicide Application Methods Used To Control Tanoak (Lithocarpus Densiflorus) In An Uneven-Aged Coast Redwood Management Context, Douglas D. Piirto, Brenda Smith, Eric K. Huff, Scott T. Robinson
Efficacy Of Herbicide Application Methods Used To Control Tanoak (Lithocarpus Densiflorus) In An Uneven-Aged Coast Redwood Management Context, Douglas D. Piirto, Brenda Smith, Eric K. Huff, Scott T. Robinson
Douglas D. Piirto
Three methods of tanoak (Lithocarpus densiflorus [Hook. & Arn.] Rehd.) control involving the application of the amine or ester form of triclopyr were evaluated in this coast redwood uneven-aged forest management study of herbicides. A cut-stump application with the amine form of triclopyr (Garlon 3A), frill cut with the amine form of triclopyr, basal-bark (outer surface) with the ester form of triclopyr (Garlon 4), and an untreated control were replicated three times. The tanoak control results in Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) and/ or coast redwood (Sequoia sempervirens [D. Don] Endl.) predominated stands obtained in earlier studies …
Cost-Effective Fire Management For Southern California's Chaparral Wilderness: An Analytical Procedure, Chris A. Childers, Douglas D. Piirto
Cost-Effective Fire Management For Southern California's Chaparral Wilderness: An Analytical Procedure, Chris A. Childers, Douglas D. Piirto
Douglas D. Piirto
Fire management has always meant fire suppression to the managers of the chaparral covered southern California National Forests. Today, Forest Service fire management programs must be cost effective, while wilderness fire management objectives are aimed at recreating natural fire regimes. A cost-effectiveness analysis has been developed to compare fire management options for meeting these objectives in California's chaparral wilderness. This paper describes the analytical procedure using examples from a study currently being conducted for the Los Padres National Forest, and discusses some preliminary results.
Fluoranthene, But Not Benzo[A]Pyrene, Interacts With Hypoxia Resulting In Pericardial Effusion And Lordosis In Developing Zebrafish, Cole W. Matson, Alicia R. Timme-Laragy, Richard T. Di Giulio
Fluoranthene, But Not Benzo[A]Pyrene, Interacts With Hypoxia Resulting In Pericardial Effusion And Lordosis In Developing Zebrafish, Cole W. Matson, Alicia R. Timme-Laragy, Richard T. Di Giulio
Alicia R. Timme-Laragy
Previous research has documented several PAHs that interact synergistically, causing severe teratogenicity in developing fish embryos. The coexposure of CYP1A inhibitors (e.g. FL or ANF) with AHR agonists (e.g. BaP or BNF) results in a synergistic increase in toxicity. As with chemical CYP1A inhibitors, it has also been shown that CYP1A morpholinos exacerbate BNF-induced embryotoxicity. We hypothesized that a hypoxia-induced reduction in CYP1A activity in BNF or BaP-exposed zebrafish embryos would similarly enhance pericardial effusion and other developmental abnormalities. BaP, BNF, ANF, and FL exposures, both individually and as BaP+FL or BNF+ANF combinations, were performed under hypoxia and normoxia. CYP1A …
Reframing Global Health & Environmental Issues In The 21st Century, Nat Quansah
Reframing Global Health & Environmental Issues In The 21st Century, Nat Quansah
Nat Quansah
No abstract provided.
A Method For Computing Infiltration And Redistribution In A Discretized Moisture Content Domain, Fred L. Ogden
A Method For Computing Infiltration And Redistribution In A Discretized Moisture Content Domain, Fred L. Ogden
Fred L. Ogden
A new one-dimensional infiltration and redistribution method is proposed as an alternative to the Richards equation (RE) for coupled surface and subsurface models. The proposed method discretizes soil water content into hypothetical hydraulically interacting bins. The entry and propagation of displacement fronts in each bin are simulated by means of explicit infiltration and drainage approximations based on capillary and gravitational driving forces. Wetting front advances within bins create water deficits that are satisfied by capillary-driven interbin flow. The method inherently provides numerical stability by precluding the need to directly estimate nonlinear gradients through numerical schemes. Comparisons of the performance of …
Świadomość Społeczna Z Zakresu Niekontrolowanego Spalania Odpadów I Problemu Dioksyn, Robert Oleniacz, Anna Tomkowicz
Świadomość Społeczna Z Zakresu Niekontrolowanego Spalania Odpadów I Problemu Dioksyn, Robert Oleniacz, Anna Tomkowicz
Robert Oleniacz
The paper presents the problem of uncontrolled waste combustion in a rural community (Municipality Krościenko Wyżne, South-East Poland) and social awareness concerning the formation of dioxins using the results of the survey. In the questionnaire studies both combustion of wastes in household stoves was included as well as on the open space. The results of the survey showed a large scale of waste burning and low public awareness of inhabitants of the Polish village.
English title: Public awareness in the field of uncontrolled waste combustion and the problem of dioxins.
Forward Modeling Synsedimentary Deformation Associated With A Prograding Steep-Rimmed Carbonate Margin, Phillip Resor
Forward Modeling Synsedimentary Deformation Associated With A Prograding Steep-Rimmed Carbonate Margin, Phillip Resor
Phillip G Resor
No abstract provided.
Being Prepared - Community Flood Education Planning In Nsw, Neil Dufty, David Webber
Being Prepared - Community Flood Education Planning In Nsw, Neil Dufty, David Webber
Neil Dufty
No abstract provided.
Evaluation Of The Floodsmart And Stormsmart Pilot Programs And Their Transferability To The Urban Environment (Report), Neil Dufty
Neil Dufty
No abstract provided.
Review Of The Gippsland November 2007 Flood Response (Report), Neil Dufty
Review Of The Gippsland November 2007 Flood Response (Report), Neil Dufty
Neil Dufty
No abstract provided.
A New Approach To Flood Education (Booklet), Neil Dufty
A New Approach To Flood Education (Booklet), Neil Dufty
Neil Dufty
No abstract provided.
Global Warming: Forecasts By Scientists Versus Scientific Forecasts, Kesten C. Green, J. Scott Armstrong
Global Warming: Forecasts By Scientists Versus Scientific Forecasts, Kesten C. Green, J. Scott Armstrong
J. Scott Armstrong
In 2007, the Intergovernmental Panel on Climate Changes Working Group One, a panel of experts established by the World Meteorological Organization and the United Nations Environment Programme, issued its updated, Fourth Assessment Report, forecasts. The Report was commissioned at great cost in order to provide policy recommendations to governments. It included predictions of dramatic and harmful increases in average world temperatures over the next 92 years. Using forecasting principles as our guide we asked, are these forecasts a good basis for developing public policy? Our answer is "no." To provide forecasts of climate change that are useful for policy-making, one …
Cracking And Crumbling: Exploring Mechanisms Of Dike Emplacement, Teaching Structural Geology In The 21st Century, Resources For Teaching Structural Geology, Phillip Resor
Phillip G Resor
No abstract provided.
Teaching Structural Geology Through Integrated Field Observation And Modeling, Phillip Resor
Teaching Structural Geology Through Integrated Field Observation And Modeling, Phillip Resor
Phillip G Resor
Research in Earth and Environmental Sciences is becoming increasingly quantitative and process-based. This trend is driven by the widespread availability of digital data sets and high-power computing as well as the need to develop predictive models of earth processes to address societal problems. To address these changes in the field I integrate traditional aspects of structural geology including field observation and three-dimensional visualization with quantitative process-based methods in a series of topical course modules. Two examples of this approach are: 1) An integrated investigation into rock fracture that includes performing Nick Nickelsen's plaster of paris dike in Jello experiment (Davis …
Photogrammetric 3d Mapping Of The Permian Reef, Nm And Tx, Usa, Phillip Resor, George Bennum, Eric Flodin, Jeremy Fairbanks
Photogrammetric 3d Mapping Of The Permian Reef, Nm And Tx, Usa, Phillip Resor, George Bennum, Eric Flodin, Jeremy Fairbanks
Phillip G Resor
Although the Permian Capitan depositional system is perhaps one of the best-exposed and most thoroughly studied steep-rimmed carbonate systems, the role of synsedimentary deformation in the development of the platform geometry is still poorly understood. We have undertaken an effort to map 3D stratal and structural architecture in two regions of the Guadalupe Mountains, Slaughter and Big Canyons, to better constrain present-day geometry and quantify the distribution and magnitude of syn- and post-depositional deformation. The resulting 3D geologic models serve to inform and constrain mechanical models aimed at understanding the process of synsedimentary deformation, including formation of early fracture systems …
Community-Based Rangeland Rehabilitation: The Tall Ar-Remah Case Study, Raed Al-Tabini, H. Saoub, K. Alkhalidi
Community-Based Rangeland Rehabilitation: The Tall Ar-Remah Case Study, Raed Al-Tabini, H. Saoub, K. Alkhalidi
Raed Al-Tabini
No abstract provided.
Community-Based Projects In Jordan's Badia: The Anaqeed Al-Khair Case Study, Raed Al-Tabini, B. Gorman, J. Libbin, R. Grassberger, I. Abuamoud, S. Aloun
Community-Based Projects In Jordan's Badia: The Anaqeed Al-Khair Case Study, Raed Al-Tabini, B. Gorman, J. Libbin, R. Grassberger, I. Abuamoud, S. Aloun
Raed Al-Tabini
No abstract provided.
Integrating Geomechanical Modeling And Three-Dimensional Mapping To Constrain Deformation Associated With Growth Of The Permian Capitan Reef Complex, Phillip Resor, Eric Flodin
Integrating Geomechanical Modeling And Three-Dimensional Mapping To Constrain Deformation Associated With Growth Of The Permian Capitan Reef Complex, Phillip Resor, Eric Flodin
Phillip G Resor
The stratal geometry of the Permian Capitan Reef Complex has been influenced by syn-sedimentary deformation including tilting, folding, Previous HitfracturingTop, and faulting of strata. The importance of these effects has been a topic of debate for decades and impacts our understanding of the initial sedimentary geometry as well as the distribution of early-formed fracture systems. We use geomechanical finite element modeling to predict the magnitude and distribution of syn-sedimentary deformation associated with a prograding shelf margin. The model is linear elastic with heterogeneous layering comprised of four principal facies (platform, reef, upper slope, and lower slope/basin). In order to simulate …
Water Resource Requirements Of Corn-Based Ethanol, Stanley Mubako
Water Resource Requirements Of Corn-Based Ethanol, Stanley Mubako
Stanley Mubako
No abstract provided.
Southern Africa Environment Outlook 2008, Stanley Mubako
Southern Africa Environment Outlook 2008, Stanley Mubako
Stanley Mubako
No abstract provided.
Ocena Wpływu Planowanego Zakładu Termicznego Przekształcania Odpadów Komunalnych Na Jakość Powietrza W Krakowie, Robert Oleniacz, Maria Pilch
Ocena Wpływu Planowanego Zakładu Termicznego Przekształcania Odpadów Komunalnych Na Jakość Powietrza W Krakowie, Robert Oleniacz, Maria Pilch
Robert Oleniacz
Construction of the Municipal Solid Waste Incineration (MSWI) plant is considered optimal in the Programme of Management of Solid Waste in Krakow as well as in proposed scenarios of Municipal Waste Management. Evaluation of impact of the incineration plant with a capacity of 255000 tons per year on air quality in Krakow is presented in this work. The evaluation is based on assumption that air pollutant emissions from the incinerator will be at the highest allowed level resulting from emission limit values for waste incineration plants with operation time each of two planned lines 7500 hours per year. Calculation results …
Deformation Associated With A Continental Normal Fault System, Western Grand Canyon, Arizona, Phillip G. Resor
Deformation Associated With A Continental Normal Fault System, Western Grand Canyon, Arizona, Phillip G. Resor
Phillip G Resor
Reverse-drag folds are often used to infer subsurface fault geometry in extended terrains, yet details of how these folds form in association with slip on normal fault systems are poorly understood. Detailed structural mapping and global positioning system (GPS) surveying of the Frog Fault and Lone Mountain Monocline in the western Grand Canyon demonstrate a systematic relationship between elements of the normal fault system and fold geometry. The Lone Mountain Monocline, which parallels the Frog Fault, is made up of two half-monoclinal flexures: a hanging-wall fold in which dips gradually increase toward the fault over ~1.5 km reaching a maximum …
A New Approach To Community Flood Education, Neil Dufty
A New Approach To Community Flood Education, Neil Dufty
Neil Dufty
No abstract provided.
Building Community Resilience To Floods: The Role Of Education (Booklet), Neil Dufty
Building Community Resilience To Floods: The Role Of Education (Booklet), Neil Dufty
Neil Dufty
No abstract provided.