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2000

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Articles 511 - 540 of 2647

Full-Text Articles in Physical Sciences and Mathematics

A Lattice Path Integral For Supersymmetric Quantum Mechanics, Simon Catterall, Eric B. Gregory Aug 2000

A Lattice Path Integral For Supersymmetric Quantum Mechanics, Simon Catterall, Eric B. Gregory

Physics - All Scholarship

We report on a study of the supersymmetric anharmonic oscillator computed using a euclidean lattice path integral. Our numerical work utilizes a Fourier accelerated hybrid Monte Carlo scheme to sample the path integral. Using this we are able to measure massgaps and check Ward identities to a precision of better than one percent. We work with a non-standard lattice action which we show has an {\it exact} supersymmetry for arbitrary lattice spacing in the limit of zero interaction coupling. For the interacting model we show that supersymmetry is restored in the continuum limit without fine tuning. This is contrasted with …

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An Approximation To Miscible Fluid Flows In Porous Media With Point Sources And Sinks By An Eulerian-Lagrangian Localized Adjoint Method And Mixed Finite Element Methods, Hong Wang, Liang Dong, Richard E. Ewing, Stephen L. Lyons, Guan Qin Aug 2000

An Approximation To Miscible Fluid Flows In Porous Media With Point Sources And Sinks By An Eulerian-Lagrangian Localized Adjoint Method And Mixed Finite Element Methods, Hong Wang, Liang Dong, Richard E. Ewing, Stephen L. Lyons, Guan Qin

Faculty Publications

We develop an Eulerian–Lagrangian localized adjoint method (ELLAM)-mixed finite element method (MFEM) solution technique for accurate numerical simulation of coupled systems of partial differential equations (PDEs), which describe complex fluid flow processes in porous media. An ELLAM, which was shown previously to outperform many widely used methods in the context of linear convection-diffusion PDEs, is presented to solve the transport equation for concentration. Since accurate fluid velocities are crucial in numerical simulations, an MFEM is used to solve the pressure equation for the pressure and Darcy velocity. This minimizes the numerical difficulties occurring in standard methods for approximating velocities caused …

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Magnetic Localization In Transition-Metal Nanowires, Ralph Skomski, H. Zeng, M. Zheng, David J. Sellmyer Aug 2000

Magnetic Localization In Transition-Metal Nanowires, Ralph Skomski, H. Zeng, M. Zheng, David J. Sellmyer

David Sellmyer Publications

Magnetization reversal in transition-metal nanowires is investigated. Model calculations explain why magnetization reversal is localized, as opposed to the sometimes assumed delocalized coherent-rotation and curling modes. The localization is a quite general phenomenon caused by morphological inhomogenities and occurring in both polycrystalline and single-crystalline wires. In the polycrystalline limit, the competition between interatomic exchange and anisotropy gives rise to a variety of random-anisotropy effects, whereas nearly single-crystalline wires exhibit a weak localization of the nucleation mode. Model predictions are used to explain the coercive and magnetic-viscosity behavior of Co (and Ni) nanowires electrodeposited in self-assembled alumina pores.

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Spectroscopy And Photometry Of Nearby Young Solar Analogs, Eric J. Gaidos, Gregory W. Henry, Stephen M. Henry Aug 2000

Spectroscopy And Photometry Of Nearby Young Solar Analogs, Eric J. Gaidos, Gregory W. Henry, Stephen M. Henry

Information Systems and Engineering Management Research Publications

We present new photometry and spectroscopy of 34 stars from a catalog of 38 nearby (d < 25 pc) G and K dwarfs selected as analogs to the early Sun. We report that the least active star in our sample is also slowly rotating and probably of solar age. Two other stars appear to be evolved objects that have recently acquired angular momentum. A fourth star may be a spectroscopic binary. Many of the other stars belong to previously identified common proper-motion groups. Space motions, lithium abundances, and Ca II emission of these stars suggest ages between 70 and 800 Myr.

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Association Of Energetic Neutral Atom Bursts And Magnetospheric Substorms, A. M. Jorgensen, L. Kepko, M. G. Henderson, Harlan E. Spence, G. D. Reeves, J. B. Sigwarth, L. A. Frank Aug 2000

Association Of Energetic Neutral Atom Bursts And Magnetospheric Substorms, A. M. Jorgensen, L. Kepko, M. G. Henderson, Harlan E. Spence, G. D. Reeves, J. B. Sigwarth, L. A. Frank

Physics & Astronomy

No abstract provided.

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The John Muir Newsletter, Fall 2000, The John Muir Center For Regional Studies Aug 2000

The John Muir Newsletter, Fall 2000, The John Muir Center For Regional Studies

Muir Center Newsletters (1981-2015)

I J ' Ov Volume 10, Number 4 NEWSLETTER I Fall 2000 A Sense of the Natural by Richard F. Fleck w rom the time of my first published essay about a Maine sea coast tidal pool in June, 1954 (when I was not quite seventeen), until now, some forty-six fpars later, my major source of inspiration has been the Batural world, be it the Irish Mountains of Mourne rolling flown to the sea or the rocky coast of Maine, or the windy Himmits of Longs Peak, Colorado or Mount Fuji, Japan, ■have always delighted in the smell of turf …

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Molecular-Dynamics Study Of Phase Transitions In Alkali Thiocyanates, M. M. Ossowski, John R. Hardy, Robert W. Smith Aug 2000

Molecular-Dynamics Study Of Phase Transitions In Alkali Thiocyanates, M. M. Ossowski, John R. Hardy, Robert W. Smith

Physics Faculty Publications

An account is presented of our studies of the order-disorder phase transitions in KSCN, RbSCN, and CsSCN. These are based on parameter-free interionic potentials based on the Gordon-Kim modified electron gas formalism extended to molecular ions. We performed static structural relaxations and supercell molecular dynamics and predicted with reasonable accuracy the temperatures for the onset of the transitions. In particular, we address the question of how the SCN2 ions disorder to yield subsequent structural transformations. We found high-temperature phases of average Fm3¯m symmetry for both KSCN and RbSCN. We argue that in reality the full appearance of these phases is …

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Economics Of Using On-Farm Reservoirs To Distribute Diverted Surface Water To Depleted Ground Water Areas Of The Southern Mississippi Valley Region, Eric J. Wailes, Kenneth B. Young, James Smartt, Gail L. Cramer Aug 2000

Economics Of Using On-Farm Reservoirs To Distribute Diverted Surface Water To Depleted Ground Water Areas Of The Southern Mississippi Valley Region, Eric J. Wailes, Kenneth B. Young, James Smartt, Gail L. Cramer

Arkansas Water Resources Center Technical Reports

Rapid ground water depletion has become a significant problem for parts of the Southern Mississippi River Valley. In 1997, the Arkansas Soil and Water Conservation Commission (ASWCC) declared six counties in the Grand Prairie of Arkansas critical ground water areas. A proposed solution to the ground water depletion problem in this region is to divert surplus flows from the White River by a canal system to the farmer stakeholders. To make the system work, on-farm reservoirs will be needed to store and manage the diverted surface water for crop irrigation use during the growing season.

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Effect Of The Direction Of The Blast On Vegetation Recovery Within The Zone Of Devastation Created By The May 18, 1980 Eruption Of Mount St. Helens, Washington, Dmitri Barkovsky Aug 2000

Effect Of The Direction Of The Blast On Vegetation Recovery Within The Zone Of Devastation Created By The May 18, 1980 Eruption Of Mount St. Helens, Washington, Dmitri Barkovsky

All-Inclusive List of Electronic Theses and Dissertations

A number of different remote sensing techniques were used to analyze Landsat TM image data in order to study vegetation recovery patterns at three locations within the zone of devastation of Mount St. Helens (MSH). Prior to the May 18, 1980 eruption, the vegetation in the area ofMSH was characterized by mature coniferous forest disturbed only by a few clearcuts, according to analysis of Landsat MSS data. As a result of the MSH eruption, more than 600 sq. km of the area predominantly north of the volcano were severely devastated by a number of volcanic events such as phreatic explosions, …

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Comparative Analysis Of Thebes And Kirk Lithic Technology And Home Range Implications In Southwestern Indiana, Mark E. Cantin Aug 2000

Comparative Analysis Of Thebes And Kirk Lithic Technology And Home Range Implications In Southwestern Indiana, Mark E. Cantin

All-Inclusive List of Electronic Theses and Dissertations

Early Archaic populations are typically characterized as highly mobile forager groups with expansive home ranges, though little distinction is made between systems of penecontemporaneous groups. This thesis will investigate and compare home range size, technology, and material type and quality selection practices between two Early Archaic populations as manifested by Kirk and Thebes Cluster projectile points in a data set recovered from southwestern Indiana. The mechanisms behind and the relationships between chert selection and mobility will be shown as a complex feedback loop. As such, the role of curation, embeddedness, and risk management in technological organization and the potential influence …

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Study Of Polyaromatic Hydrocarbons Emitted In The Fly Ash From Coal Combustion In A Fluidized Bed Combuster, Rebecca Heltsley Aug 2000

Study Of Polyaromatic Hydrocarbons Emitted In The Fly Ash From Coal Combustion In A Fluidized Bed Combuster, Rebecca Heltsley

Masters Theses & Specialist Projects

Exposure to Polyaromatic Hydrocarbons (PAHs) has long been identified as an environmental concern because of their carcinogenic and mutagenic effects. The Environmental Protection Agency (EPA) has developed a list of 16 PAHs that are found on the Priority Pollutant List due to the extensive amount of data suggesting the hazards of these compounds. These toxic compounds are often emitted into the atmosphere by anthropogenic sources, such as combustors. Therefore, analysis of these compounds must be conducted during coal combustion. Two 1000-hour coal combustion burns were performed using the 0.1 MWth bench-scale fluidized bed combustor (FBC), which is found in the …

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Characterization Of An Isolate That Uses Vinyl Chloride As A Growth Substrate Under Aerobic Conditions, Matthew F. Verce, Ricky L. Ulrich, David L. Freedman Aug 2000

Characterization Of An Isolate That Uses Vinyl Chloride As A Growth Substrate Under Aerobic Conditions, Matthew F. Verce, Ricky L. Ulrich, David L. Freedman

Publications

An aerobic enrichment culture was developed by using vinyl chloride (VC) as the sole organic carbon and electron donor source. VC concentrations as high as 7.3 mM were biodegraded without apparent inhibition. VC use did not occur when nitrate was provided as the electron acceptor. A gram-negative, rod-shaped, motile isolate was obtained from the enrichment culture and identified based on biochemical characteristics and the sequence of its 16S rRNA gene as Pseudomonas aeruginosa, designated strain MF1. The observed yield of MF1 when it was grown on VC was 0.20 mg of total suspended solids (TSS)/mg of VC. Ethene, acetate, glyoxylate, …

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Development Of Bismaleimide/Cyanate Ester Based Aerospace Polymers For Possible Use In Nasa's Relaunchable Vehicles Program, Brian Sisk Aug 2000

Development Of Bismaleimide/Cyanate Ester Based Aerospace Polymers For Possible Use In Nasa's Relaunchable Vehicles Program, Brian Sisk

Masters Theses & Specialist Projects

Since the beginning of the space age, the goal of materials development in the aerospace industry has been to replace metal alloys with much lighter polymer resins, while maintaining the strength over a wide temperature range characteristic of metals. Polymers such as polyimides and epoxies have been used to satisfy many needs, but strength, temperature resistance, and ease of processing are difficult to incorporate into a single polymer. Because of this gap, bismaleimides and cyanate esters, and possibly combinations of the two, are seen as having potential in applications where ease of processing characteristic of epoxies is desired, but for …

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Ecology Of Elk In The Pine Ridge Region Of Northwestern Nebraska: Seasonal Distribution, Characteristics Of Wintering Sites, And Herd Health, Michael A. Cover Aug 2000

Ecology Of Elk In The Pine Ridge Region Of Northwestern Nebraska: Seasonal Distribution, Characteristics Of Wintering Sites, And Herd Health, Michael A. Cover

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

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An Analysis Of Deer–Vehicle Collisions: The Case Of Ohio, Kurt A. Schwabe, Peter W. Schuhmann, Michael J. Tonkovich, Ellen Wu Aug 2000

An Analysis Of Deer–Vehicle Collisions: The Case Of Ohio, Kurt A. Schwabe, Peter W. Schuhmann, Michael J. Tonkovich, Ellen Wu

Human Conflicts with Wildlife: 2002 Symposium

The costs of deer-vehicle collisions (DVCs) in Ohio are estimated to be in excess of US$ 52 million annually. The intention of this paper is to identify factors contributing to the abundance of DVCs in Ohio, calculate the average cost of a deer–vehicle collision event, and illustrate the potential gains in economic efficiency from alternative approaches for reducing DVCs. Our results suggest that large potential economic gains from reducing DVCs in Ohio exist and that the optimal strategies for achieving these reductions seem to combine both changes in deer management schemes and deer-vehicle mitigation strategies.

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Economic Analysis Of A Large Scale Oral Vaccination Program To Control Raccoon Rabies, Philip Kemere, Michael K. Liddel, Phylo Evangelou, Dennis Slate, Steven Osmek Aug 2000

Economic Analysis Of A Large Scale Oral Vaccination Program To Control Raccoon Rabies, Philip Kemere, Michael K. Liddel, Phylo Evangelou, Dennis Slate, Steven Osmek

Human Conflicts with Wildlife: 2002 Symposium

Since the late 1980s, results of oral vaccination trials in several states have provided growing evidence that this vaccination method may be effective for controlling the spread of rabies in raccoons (Procyon lotor). This study examines the economic feasibility of using oral vaccination on a larger scale than previous trials. We analyze the benefits and costs associated with a hypothetical barrier that would stretch from Lake Erie to the Gulf of Mexico, combining natural geographic features provided by the Appalachian Mountains with oral vaccination zones. The goal of this barrier would be to prevent the raccoon rabies variant …

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Cormorant Depredation Losses And Their Prevention At Catfish Farms: Economic Considerations, James F. Glahn, Scott J. Werner, Terry Hanson, Carole R. Engle Aug 2000

Cormorant Depredation Losses And Their Prevention At Catfish Farms: Economic Considerations, James F. Glahn, Scott J. Werner, Terry Hanson, Carole R. Engle

Human Conflicts with Wildlife: 2002 Symposium

Although several piscivorous birds are involved in depredation conflicts with southern aquaculture, the double-crested cormorant causes some of the most widespread and significant problems to catfish, the dominant industry. Unlike other agriculture commodities, catfish losses due to predation cannot be directly measured, so we review several approaches taken to estimate these losses. Although these approaches are valid for predicting the costs of simply replacing these fish at the time of predation, they have been criticized because they failed to consider the functional relationships between predation and output parameters at harvest. Recent controlled experiments are reviewed that confirm previous estimates of …

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Fundamentals Of Economic Principles And Wildlife Management, Peter W. Schuhmann, Kurt A. Schwabe Aug 2000

Fundamentals Of Economic Principles And Wildlife Management, Peter W. Schuhmann, Kurt A. Schwabe

Human Conflicts with Wildlife: 2002 Symposium

This paper presents an overview of the economic fundamentals involved in wildlife management, with special consideration for cases involving harmful wildlife-human interactions. The process of benefit-cost analysis is used as a unifying platform for incorporating both theoretical and empirical issues. Topics such as external market effects and public goods are detailed in order to give the reader a theoretical foundation for understanding the economic perspective on the problems associated with defining and attaining optimally managed wildlife populations. To these principles we add practical considerations for measuring the costs and benefits associated with wildlife populations. Different categories of wildlife values, such …

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Damage Abatement And Compensation Programs As Incentives For Wildlife Management On Private Land, Jonathan K. Yoder Aug 2000

Damage Abatement And Compensation Programs As Incentives For Wildlife Management On Private Land, Jonathan K. Yoder

Human Conflicts with Wildlife: 2002 Symposium

Public damage abatement and compensation programs may be used to alter private incentives for damage abatement and habitat provision. A model is developed that explains the economic logic behind prevalent characteristics of public wildlife damage programs. The model is supported with an examination of a broad cross-section of wildlife agency policy and law. The model can be used by wildlife managers and policy makers as a conceptual framework for understanding the incentive effects of compensation and abatement policy.

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The Endangered Species Act And Private Landowner Incentives, Jeffrey A. Michael Aug 2000

The Endangered Species Act And Private Landowner Incentives, Jeffrey A. Michael

Human Conflicts with Wildlife: 2002 Symposium

While intended to increase the habitat available to endangered species, the restrictions of the Endangered Species Act (ESA) increase the costs of harboring an endangered species to private landowners and create incentives for private landowners to reduce habitat. This paper illustrates the incentive for habitat destruction with a simple model of private land use under the ESA, and uses it to predict the effects of changes in policy or biological conditions on private landowner incentives. Many anecdotal accounts and recent empirical research support the predictions of the model. Because of the ESA’s perverse incentives, many have proposed replacing the punitive …

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Economic Considerations Of Damage Assessment, Richard M. Engeman Aug 2000

Economic Considerations Of Damage Assessment, Richard M. Engeman

Human Conflicts with Wildlife: 2002 Symposium

Cost-effectiveness is the fundamental economic test of any damage control or damage mitigation strategy, and damage assessment is the essential component for determination of cost-effectiveness. However, there are many potential costs associated with making damage assessments. The sampling and measurement required to produce a damage assessment have associated effort and costs, but even greater costs can be incurred due to inappropriate management decisions resulting from inaccurate damage assessments. Other costs can result from using an assessment method that is unsuited to management objectives, or by misinterpreting or not understanding the relationship between observed damage and actual losses. The concepts of …

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Spreadsheets, Response Surfaces, And Intervention Decisions In Wildlife Damage Management, Ray T. Sterner Aug 2000

Spreadsheets, Response Surfaces, And Intervention Decisions In Wildlife Damage Management, Ray T. Sterner

Human Conflicts with Wildlife: 2002 Symposium

An a priori approach to examining the economics of performing management activities to reduce agricultural and resource damage by wildlife is described. Computer spreadsheet procedures are used to derive response surfaces of potential net savings and benefit:cost indices for selected crop- or resource-protection activities. Tabular and graphical displays of these indices afford decision-making aids for wildlife-damage interventions. An example based on the use of an acute rodenticide, zinc phosphide (Zn3P2), for vole (Microtus spp.) control in alfalfa (Medicago sativa) is described. Iterative calculations were derived for 1,260 possible combinations of 3 field-size, 6 …

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Impacts Of House Mice On Crops In Australia: Costs And Damage, Peter R. Brown, Grant R. Singleton Aug 2000

Impacts Of House Mice On Crops In Australia: Costs And Damage, Peter R. Brown, Grant R. Singleton

Human Conflicts with Wildlife: 2002 Symposium

Rodents cause serious losses to crops in many different parts of the world. The house mouse (Mus domesticus, Schwarz and Schwarz 1943) is a serious pest to agriculture in Australia. The impacts of house mouse damage to crops in Australia were examined. Plagues of mice (> 1,000 mice/ha) cause enormous economic and social stress to rural communities in Australia. The mouse plague in 1993/94 caused about US$60 million in damage to crops, intensive livestock industries, and rural communities. The impact of mouse plagues is generally well understood, but there is a dearth of knowledge about the relationship between …

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Development Of A Model To Assess Rodent Control In Swine Facilities, Kurt C. Vercauteren, Scott E. Hygnstrom, Robert M. Timm, Robert M. Corrigan, John Beller, Larry L. Bitney, Michael C. Brumm, Daniel Meyer, Dallas R. Virchow, Robert W. Wills Aug 2000

Development Of A Model To Assess Rodent Control In Swine Facilities, Kurt C. Vercauteren, Scott E. Hygnstrom, Robert M. Timm, Robert M. Corrigan, John Beller, Larry L. Bitney, Michael C. Brumm, Daniel Meyer, Dallas R. Virchow, Robert W. Wills

Human Conflicts with Wildlife: 2002 Symposium

At the request, and with the support, of the National Pork Producers Council we are conducting a comprehensive economic analysis of rodent control in swine production facilities. The authors represent an interdisciplinary working group that has been assembled to identify all necessary input variables and values associated with rodent damage and control. The working group consists of specialists in swine production, facilities management, agricultural economics, swine health, rodent control, the pest management industry, systems modeling, and distance education. We incorporated data from the scientific literature and personal experience into an interactive STELLA systems model. The model generates benefit-cost analyses and …

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Using Bioeconomic Models To Maximize Benefits From Vertebrate Pest Control: Lamb Predation By Feral Pigs, David Choquenot, Jim Hone Aug 2000

Using Bioeconomic Models To Maximize Benefits From Vertebrate Pest Control: Lamb Predation By Feral Pigs, David Choquenot, Jim Hone

Human Conflicts with Wildlife: 2002 Symposium

The question “When should investment in pest control stop?” either explicitly or implicitly underpins decisions concerning pest control made at every level of enterprise or government, regardless of whether these decisions are tactical or strategic. Bioeconomic modeling provides a quantitative framework for considering the benefits and costs of alternative pest control strategies. In this case study, we develop 3 bioeconomic models that examine strategies based on helicopter shooting and 1080 poisoning, for reducing feral pig (Sus scrofa) predation of newborn lambs in wool-growing enterprises located in Australia’s rangelands. In the first model, marginal analysis indicated that helicopter shooting …

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Economics Of Predation Management In Relation To Agriculture, Wildlife, And Human Health And Safety, Michael J. Bodenchuk, J. Russell Mason, William C. Pitt Aug 2000

Economics Of Predation Management In Relation To Agriculture, Wildlife, And Human Health And Safety, Michael J. Bodenchuk, J. Russell Mason, William C. Pitt

Human Conflicts with Wildlife: 2002 Symposium

Predation management is controversial and much recent debate has focused on the cost of management efforts. This manuscript considers the cost of predators to agriculture, big game or threatened and endangered species management, and human health and safety. Subsequently, the cost of efforts to manage predation in these contexts is discussed, and benefit:cost ratios are calculated. When properly applied, predation management shows benefit:cost ratios of between 3:1 to 27:1 for agriculture and 2:1 to 22:1 for wildlife protection. For human health and safety, benefit:cost ratios are more difficult to calculate, but we argue that benefits outweigh costs in many different …

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The Economics Of Managing Beding's Ground Squirrel In Alfalfa In Northeastern California, Desley A. Whisson, Steve B. Orloff, Donald L. Lancaster Aug 2000

The Economics Of Managing Beding's Ground Squirrel In Alfalfa In Northeastern California, Desley A. Whisson, Steve B. Orloff, Donald L. Lancaster

Human Conflicts with Wildlife: 2002 Symposium

We used estimates of yield loss from 1995 to 1999 and the reported costs and effectiveness of available control methods to provide a basis for developing a cost-effective management strategy for Belding’s ground squirrels in alfalfa in northern California. Mean annual losses varied between US$ 110/ha and US$ 300/ha of alfalfa. Growers usually spend less than US$ 25/ha on control methods that are implemented haphazardly and provide poor control. We suggest that growers can afford to spend more on control methods such as burrow fumigation or exclusion fencing that previously have been viewed as being too expensive. Control efforts should …

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Economic Tools For Managing Impacts Of Urban Canada Geese, Nicole H. Mccoy Aug 2000

Economic Tools For Managing Impacts Of Urban Canada Geese, Nicole H. Mccoy

Human Conflicts with Wildlife: 2002 Symposium

Management of urban Canada geese impacts can be assisted by the use of economic analyses of both the problem and the proposed solution. Management of a species that is both geographically mobile and stationary, protected by the Migratory Bird Act of 1918, and loved by much of the public while posing a significant risk of damage to both private and public property is a difficult task. The issue is further complicated by the scope and scale of urban goose impacts. While the presence of urban Canada geese results in both positive and negative impacts, this paper will focus primarily on …

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Evaluation Of Wildlife Damage To Forests In Germany, Markus J. Schaller Aug 2000

Evaluation Of Wildlife Damage To Forests In Germany, Markus J. Schaller

Human Conflicts with Wildlife: 2002 Symposium

Legal regulations concerning wildlife damage in Germany are totally different from regulations in the United States. In certain cases German game laws provide the right to compensation for wildlife damage to forests for forest owners. But not everyone has to be compensated. Liability exists only for damage caused by hooved game, rabbits, and pheasants, and only to important local tree species (Hauptholzarten). If, for example, red deer damage an afforestation of Norway spruce (Picea abies) by browsing, normally the shooting tenant has to compensate for the damage. The most important types of damage to forests in Germany are …

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The Costs Of Bird Strikes And Bird Strike Prevention, John R. Allan Aug 2000

The Costs Of Bird Strikes And Bird Strike Prevention, John R. Allan

Human Conflicts with Wildlife: 2002 Symposium

Collisions between birds (and other wildlife) and aircraft are known to cause substantial losses to the aviation industry in terms of damage and delays every year. Techniques exist to control bird numbers on airfields and hence to reduce the number of wildlife strikes, but they are applied at widely different levels from airport to airport. Some of this variation may be due to differing levels of strike-risk at the different sites, but much of it is due to the unwillingness or inability of the airports concerned to invest in bird strike prevention. Part of the reason for this reluctance to …

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