Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

Utah State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 3721 - 3750 of 7344

Full-Text Articles in Physical Sciences and Mathematics

Recent Progress In Mesospheric Gravity Wave Studies Usingnightglow Imaging Systems, Michael J. Taylor, W. R. Pendleton, Pierre-Dominique Pautet, Y. Zhao, C. Olsen, H. K. Surendra-Babu, A. F. Medeiros, H. Takahashi Jan 2007

Recent Progress In Mesospheric Gravity Wave Studies Usingnightglow Imaging Systems, Michael J. Taylor, W. R. Pendleton, Pierre-Dominique Pautet, Y. Zhao, C. Olsen, H. K. Surendra-Babu, A. F. Medeiros, H. Takahashi

All Physics Faculty Publications

During the past four decades a variety of optical remote sensing techniques have revealed a rich spectrum of wave activity in the upper atmosphere. Many of these perturbations, with periodicites ranging from ~5 min to several hours and horizontal scales of a few ten's of km to several thousands km, are due to freely propagating acoustic-gravity waves and forced tidal oscillations. Optical observations of the spatial and temporal characteristics of these waves in the mesosphere and lower thermosphere (MLT) region (~80-100 km) are facilitated by several naturally occurring, vertically distinct nightglow layers. This paper describes the use of state-of-the-art ground-based …

Go to article

Longitudinal Dependence Of Middle And Low Latitude Zonal Plasmadrifts Measured By De-2, J. W. Jensen, B. G. Fejer Jan 2007

Longitudinal Dependence Of Middle And Low Latitude Zonal Plasmadrifts Measured By De-2, J. W. Jensen, B. G. Fejer

All Physics Faculty Publications

We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are predominantly westward; the low latitude drifts are westward during the day and eastward at night. The daytime quiet-time drifts do not change much with longitude; the nighttime drifts have strong season dependent longitudinal variations. In the dusk-premidnight period, the equinoctial middle latitude westward drifts are smallest in the European sector and the low latitude eastward drifts are largest in the American-Pacific …

Go to article

Schroedinger Representation For The Polarized Gowdy Model, Charles G. Torre Jan 2007

Schroedinger Representation For The Polarized Gowdy Model, Charles G. Torre

All Physics Faculty Publications

The polarized T3 Gowdy model is, in a standard gauge, characterized by a point particle degree of freedom and a scalar field degree of freedom obeying a linear field equation on R × S1. The Fock representation of the scalar field has been well studied. We construct the Schrödinger representation for the scalar field at a fixed value of the Gowdy time in terms of square-integrable functions on a space of distributional fields with a Gaussian probability measure. We show that 'typical' field configurations are slightly more singular than square-integrable functions on the circle. For each time the corresponding Schrödinger …

Go to article

Functional Time Evolution, Anomaly Potentials, And The Geometric Phase, Charles G. Torre Jan 2007

Functional Time Evolution, Anomaly Potentials, And The Geometric Phase, Charles G. Torre

All Physics Faculty Publications

A free quantum field in 1+1 dimensions admits unitary Schrödinger picture dynamics along any foliation of spacetime by Cauchy curves. Kuchař showed that the Schrödinger picture state vectors, viewed as functionals of spacelike embeddings, satisfy a functional Schrödinger equation in which the generators of time evolution are the field energy-momentum densities with a particular normal-ordering and with a (nonunique) c-number contribution. The c-number contribution to the Schrödinger equation, called the “anomaly potential,” is needed to make the equation integrable in light of the Schwinger terms present in the commutators of the normal-ordered energy-momentum densities. Here we give a quantum geometric …

Go to article

Huntington North Dam Outlet Works Modification And Carriage Of Non-Project Water Through Emery County Project Facilities Final Environmental Assessment And Finding Of No Significant Impact, Peter Crookston Jan 2007

Huntington North Dam Outlet Works Modification And Carriage Of Non-Project Water Through Emery County Project Facilities Final Environmental Assessment And Finding Of No Significant Impact, Peter Crookston

All U.S. Government Documents (Utah Regional Depository)

This document is an Environmental Assessment (EA) for the conveyance of 14,074 acre-feet per year of non-project water through Huntington North Reservoir and the related outlet works modification and spillway construction. Huntington Cleveland Irrigation Company (HCIC) has requested Bureau of Reclamation (Reclamation) authorization for HCIC to convey non-project water through Emery County Project facilities.

Go to article

The Effects Of Charging By Ultraviolet Light On Granular Lunar Simulant In A Microgravity Environment, Sydney J. Chamberlin, Troy Munro, Sarah Isert, Tracy Garin Savage Jan 2007

The Effects Of Charging By Ultraviolet Light On Granular Lunar Simulant In A Microgravity Environment, Sydney J. Chamberlin, Troy Munro, Sarah Isert, Tracy Garin Savage

Reports and Proposals

No abstract provided.

Go to article

Paleomagnetic Dating Of Fault Slip In The Southern Rocky Mountains, Usa, And Itsimportance To An Integrated Laramide Foreland Strain Field, T. F. Wawrzyniec, Alexis K. Ault, J. W. Geissman, E. A. Erslev, S. D. Fankhauser Jan 2007

Paleomagnetic Dating Of Fault Slip In The Southern Rocky Mountains, Usa, And Itsimportance To An Integrated Laramide Foreland Strain Field, T. F. Wawrzyniec, Alexis K. Ault, J. W. Geissman, E. A. Erslev, S. D. Fankhauser

Geosciences Faculty Publications

The Laramide orogen of the U.S. Cordillera formed in the latest Cretaceous, and deformation lasted into the earliest Oligocene. Along and proximal to the eastern and northern margins of the Colorado Plateau, deformation associated with this event mainly took place along reactivated structures. Related tectonic models invoke some role for the plateau either as a stress guide transmitting compression to the foreland or as a freely rotating microplate. Models dominated by northward displacements of the Colorado Plateau also require covariance between timing and magnitude of dextral strike-slip deformation in the eastern domain and thrust deformation in the northern domain. Here …

Go to article

Utah Off-Highway Vehicle Laws And Rules, Utah Dnr State Parks Jan 2007

Utah Off-Highway Vehicle Laws And Rules, Utah Dnr State Parks

All U.S. Government Documents (Utah Regional Depository)

Utah Off-Highway Vehicle Laws and Rules taken from The Utah Off-Highway Vehicle Act and The Utah Board of Parks and Recreation Rules Title 41, Chapter 22, Utah Code Annotated 1953. NOTICE: Though the following laws and rules were screened for accuracy prior to publication, errors may still exist. In addition, changes in law and rule may be made at any time. Readers are encouraged to contact the Utah Division of Parks and Recreation for clarification of any law or rule contained herein.

Go to article

Factors Influencing Epiphytic Lichen Communities In Aspen-Associated Forests Of The Bear River Range, Idaho And Utah, Paul C. Rogers Jan 2007

Factors Influencing Epiphytic Lichen Communities In Aspen-Associated Forests Of The Bear River Range, Idaho And Utah, Paul C. Rogers

All U.S. Government Documents (Utah Regional Depository)

In western North America, quaking aspen (Populus tremuloides Michx.) is the most common hardwood in montane landscapes. Fire suppression, grazing, wildlife management practices, and climate patterns of the past century are some of the threats to aspen coverage in this region. Researchers are concerned that aspen-dependent species may be losing habitat, thereby threatening their long-term local and regional viability. Though lichens have a rich history as air pollution indicators, I believe that they may also be useful as a metric of community diversity associated with habitat change. To date, few studies have specifically examined the status of aspen’s epiphytic lichen …

Go to article

Cenozoic Extensional Processes And Tectonics In The Northern Rocky Mountains, Susanne U. Janecke Jan 2007

Cenozoic Extensional Processes And Tectonics In The Northern Rocky Mountains, Susanne U. Janecke

Susanne U. Janecke

Extension has shaped the crust of the Northern Rocky Mountains for more than a billion years. Rifting produced the Belt basin shortly after 1.5 Ga and initiated the Paleozoic passive margin. Mesozoic to early Cenozoic convergence pro-duced the Cordilleran fold-and-thrust belt, the uplifts of the Rocky Mountain foreland (Laramide) and an unusually broad Challis arc in the northern Rocky Mountains. The struc-tural grain of the contractional belts, basement features, and the rheology of the Idaho batho-lith influenced the locus, kinematics and ge-ometry of the >55 m.y. of extension that fol-lowed. Sparse data suggest that extension may have begun in the …

Go to article

Continuous Laser‐Excited Photothermal Spectrometry Of CdsXSe1‐X Doped Glasses, Oluwatosin Dada, Matthew R. Jorgensen, Stephen E. Bialkowski Jan 2007

Continuous Laser‐Excited Photothermal Spectrometry Of CdsXSe1‐X Doped Glasses, Oluwatosin Dada, Matthew R. Jorgensen, Stephen E. Bialkowski

Stephen E. Bialkowski

Photothermal lens measurements and finite element modeling are used to examine the physical changes taking place in optical filter glasses. Colored glass and neutral density filters are found to have a strong positive temperature-dependent refractive index change. The overall positive refractive index change is thought to be a consequence of complex counteracting factors: stress-induced birefringence, polarizability, structural network, and temperature-dependent carrier density changes in the CdSxSe1–x microcrystals that produce optical properties of these glasses. Finite element analysis (FEA) modeling is used to examine the temperature profiles and the goodness of the semi-infinite thermal diffusion solution normally used …

Go to article

Longitudinal Dependence Of Middle And Low Latitude Zonal Plasmadrifts Measured By De-2, J. Jensen, Bela Fejer Jan 2007

Longitudinal Dependence Of Middle And Low Latitude Zonal Plasmadrifts Measured By De-2, J. Jensen, Bela Fejer

Bela G. Fejer

We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are predominantly westward; the low latitude drifts are westward during the day and eastward at night. The daytime quiet-time drifts do not change much with longitude; the nighttime drifts have strong season dependent longitudinal variations. In the dusk-premidnight period, the equinoctial middle latitude westward drifts are smallest in the European sector and the low latitude eastward drifts are largest in the American-Pacific …

Go to article

Low-Temperature Charge Transport In Ga-Acceptor Nanowires Implanted By Focused-Ion Beams, S. J. Robinson, C. L. Perkins, T. -C. Shen, J. R. Tucker, T. Schenkel, X. W. Wang, T. P. Ma Jan 2007

Low-Temperature Charge Transport In Ga-Acceptor Nanowires Implanted By Focused-Ion Beams, S. J. Robinson, C. L. Perkins, T. -C. Shen, J. R. Tucker, T. Schenkel, X. W. Wang, T. P. Ma

T. -C. Shen

Ga-acceptor nanowires were embedded in crystalline Si using focused-ion beams. The dc current-voltage characteristics of these wires after annealing are highly nonlinear at low temperatures. A conductance threshold of less than 50mV is observed independent of Ga+ dosage and implant beam overlap. These features suggest a Coulomb blockade transport mechanism presumably caused by a network of Ga precipitates in the substrate. This granular scenario is further supported by measurements of gated nanowires. Nanowires with metallic conductance at low temperatures could be achieved by reducing the current density of the focused-ion beams.

Go to article

Aspen Indicator Species In Lichen Communities In The Bear River Range Of Idaho And Utah, Paul C. Rogers, Roger Rosentreter, Ronald J. Ryel Jan 2007

Aspen Indicator Species In Lichen Communities In The Bear River Range Of Idaho And Utah, Paul C. Rogers, Roger Rosentreter, Ronald J. Ryel

All U.S. Government Documents (Utah Regional Depository)

Aspen are thought to be declining in this region due to a combination of fire suppression, grazing and wildlife management practices, and potentially cool/wet climates of the past century which favor advancing conifer succession. Many scientists are concerned that aspen’s related species may also be losing habitat, thereby threatening the long-term local and regional viability of this important community. To date, few studies have specifically examined the role of aspen’s epiphytic lichen community. This paper presents basic community research describing the application of Indicator Species Analysis for lichens growing on aspen stems in the central Rocky Mountains of North American. …

Go to article

Utah Annual Air Monitoring Network Plan 2007 (Final Draft), Division Of Air Quality, Utah State Department Of Environmental Quality Jan 2007

Utah Annual Air Monitoring Network Plan 2007 (Final Draft), Division Of Air Quality, Utah State Department Of Environmental Quality

All U.S. Government Documents (Utah Regional Depository)

The monitoring network has been described in the network reviews from 1982 through 2007. A complete description of each station is located in the station file at the Air Monitoring Center and is available upon request. This network review will focus on the adequacy of the existing network and the changes that are needed. The existing or proposed monitoring stations are reviewed to see if the objectives are being met. The most recent emissions inventories for each pollutant are reviewed along with ambient data gathered in the area and, when available, current computer air pollution dispersion modeling is also reviewed. …

Go to article

Utah Off-Highway Vehicle Laws And Rules, Utah Dnr State Parks Jan 2007

Utah Off-Highway Vehicle Laws And Rules, Utah Dnr State Parks

All U.S. Government Documents (Utah Regional Depository)

Utah Off-Highway Vehicle Laws and Rules taken from The Utah Off-Highway Vehicle Act and The Utah Board of Parks and Recreation Rules Title 41, Chapter 22, Utah Code Annotated 1953. NOTICE: Though the following laws and rules were screened for accuracy prior to publication, errors may still exist. In addition, changes in law and rule may be made at any time. Readers are encouraged to contact the Utah Division of Parks and Recreation for clarification of any law or rule contained herein.

Go to article

Aphis’ Plant Inspection Stations: Protecting American Agriculture From Foreign Pests And Diseases, United States Department Fo Agriculture, Animal And Plant Health Inspection Service Jan 2007

Aphis’ Plant Inspection Stations: Protecting American Agriculture From Foreign Pests And Diseases, United States Department Fo Agriculture, Animal And Plant Health Inspection Service

All U.S. Government Documents (Utah Regional Depository)

In today’s global marketplace, the volume of international trade brings increased potential for the introduction of foreign pests, diseases, and noxious weeds that could threaten the safety of American agriculture. The results of such introductions can have a devastating effect on the U.S. food supply, damage our natural resources, and cost hundreds of millions of dollars in eradication and control measures that ultimately result in higher priced agricultural products for the consumer.

Go to article

Probabilistic Estimation Of Water Conservation Effectiveness, David E. Rosenberg Jan 2007

Probabilistic Estimation Of Water Conservation Effectiveness, David E. Rosenberg

Civil and Environmental Engineering Faculty Publications

An analytical method is derived to describe the distribution of water quantity saved among customers within a water-use sector who adopt a water conservation action. Analytical results tend toward lognormal distributions with long tails, quantifying a smaller subset of customers that show potential to achieve large savings. Example effectiveness distributions are shown for seven long-term conservation actions potentially implemented by urban, domestic water users in Amman, Jordan. Monte Carlo simulations verify the analytical derivations. The probabilistic outputs contrast with common methods that estimate conservation action effectiveness as a product of typical (average) characteristics for disaggregated customer groups. Implications to size …

Go to article

Characterization Of Power Induced Heating And Damage In Fiber Optic Probes For Near-Field Scanning Optical Microscopy, Nicholas E. Dickenson, E. S. Erickson, O. L. Mooren, R. C. Dunn Jan 2007

Characterization Of Power Induced Heating And Damage In Fiber Optic Probes For Near-Field Scanning Optical Microscopy, Nicholas E. Dickenson, E. S. Erickson, O. L. Mooren, R. C. Dunn

Chemistry and Biochemistry Faculty Publications

Tip-induced sample heating in near-field scanning optical microscopy (NSOM) is studied for fiber optic probes fabricated using the chemical etching technique. To characterize sample heating from etched NSOM probes, the spectra of a thermochromic polymer sample are measured as a function of probe output power, as was previously reported for pulled NSOM probes. The results reveal that sample heating increases rapidly to ~55–60°C as output powers reach ~50 nW. At higher output powers, the sample heating remains approximately constant up to the maximum power studied of ~450 nW. The sample heating profiles measured for etched NSOM probes are consistent with …

Go to article

Modeling Integrated Water User Decisions In Intermittent Supply Systems, David E. Rosenberg, Tareq Tawarneh, Rania Abdul-Khaleq, Jay Lund Jan 2007

Modeling Integrated Water User Decisions In Intermittent Supply Systems, David E. Rosenberg, Tareq Tawarneh, Rania Abdul-Khaleq, Jay Lund

Civil and Environmental Engineering Faculty Publications

We apply systems analysis to estimate household water use in an intermittent supply system considering numerous interdependent water user behaviors. Some 39 household actions include conservation; improving local storage or water quality; and accessing sources having variable costs, availabilities, reliabilities, and qualities. A stochastic optimization program with recourse decisions identifies the infrastructure investments and short-term coping actions a customer can adopt to cost-effectively respond to a probability distribution of piped water availability. Monte Carlo simulations show effects for a population of customers. Model calibration reproduces the distribution of billed residential water use in Amman, Jordan. Parametric analyses suggest economic and …

Go to article

Active Salt Tectonics In The Needles District, Canyonlands (Utah) As Detected By Interferometric Synthetic Aperture Radar And Point Target Analysis: 1992-2002, M. Furuya, K. Mueller, J. Wahr Jan 2007

Active Salt Tectonics In The Needles District, Canyonlands (Utah) As Detected By Interferometric Synthetic Aperture Radar And Point Target Analysis: 1992-2002, M. Furuya, K. Mueller, J. Wahr

Canyonlands Research Bibliography

The Needles District in Canyonlands National Park, Utah, is known for its well-exposed array of extensional faults, which are thought to be produced by gravity-driven extension and downward flexure of a thin sandstone plate into the Colorado River canyon in response to dissolution and flow of underlying evaporites (halite and gypsum). Owing to a lack of precise geodetic data, however, it remains uncertain if and to what extent those extensional faults are currently deforming. In this study we use synthetic aperture radar (SAR) data to search for ongoing, decadal ground displacements, by applying both a stacking interferometric SAR (InSAR) analysis …

Go to article

Home Range Characteristics Of Mexican Spotted Owls In The Canyonlands Of Utah, D. W. Willey, C. Van Riper Jan 2007

Home Range Characteristics Of Mexican Spotted Owls In The Canyonlands Of Utah, D. W. Willey, C. Van Riper

Canyonlands Research Bibliography

We studied home-range characteristics of adult Mexican Spotted Owls (Slyix occidentalis lucida) in southern Utah. Twenty-eight adult owls were radio-tracked using a ground-based telemetry system during 1991-95. Five males arid eight females molted tail feathers and dropped transmitters within 4 wk. We estimated cumulative home ranges for 15 Spotted Owls (12 males, 3 females). The mean estimate of cumulative home-range size was not statistically different between the minimum convex polygon and adaptive kernel (AK) 95% isopleth. Both estimators yielded relatively high SD, and male and fernale range sizes varied widely. For 12 owls tracked during both the breeding and nonbreeding …

Go to article

A Meta-Baci Approach Forevaluating Management Intervention On Chronic Wasting Disease In Mule Deer, Mary M. Conner, Michael W. Miller, Michael Ryan Ebinger, Kenneth P. Burnham Jan 2007

A Meta-Baci Approach Forevaluating Management Intervention On Chronic Wasting Disease In Mule Deer, Mary M. Conner, Michael W. Miller, Michael Ryan Ebinger, Kenneth P. Burnham

Wildland Resources Faculty Publications

Advances in acquiring and analyzing the spatial attributes of data have greatlyenhanced the potential utility of wildlife disease surveillance data for addressing problems ofecological or economic importance. We present an approach for using wildlife diseasesurveillance data to identify areas for (or of ) intervention, to spatially delineate pairedtreatment and control areas, and then to analyze these nonrandomly selected sites in a meta-analysis framework via before–after–control–impact (BACI) estimates of effect size. We applythese methods to evaluate the effectiveness of attempts to reduce chronic wasting disease(CWD) prevalence through intensive localized culling of mule deer (Odocoileus hemionus)innorth-central Colorado, USA. Areas where surveillance data …

Go to article

The Coefficient Of Bohm Diffusion In Fully Ionized Plasma And Its Theoretical Proof, Ahmad Talaei, Reza Amrollahi Dec 2006

The Coefficient Of Bohm Diffusion In Fully Ionized Plasma And Its Theoretical Proof, Ahmad Talaei, Reza Amrollahi

Graduate Student Presentations

As we know, the classical diffusion can not be able to respond the experimental results of the diffusion in the fully ionized and isothermal plasma. In this article, we purpose to extract the empirical coefficients of the Bohm diffusion and its confinement time, theoretically, in the fully ionized plasma, using the single fluid MHD equations.

Go to article

Final Technical Report: Integrated Restoration Strategies Towards Weed Control On Western Rangelands, Robert Nowak Dec 2006

Final Technical Report: Integrated Restoration Strategies Towards Weed Control On Western Rangelands, Robert Nowak

All U.S. Government Documents (Utah Regional Depository)

Invasive species are having severe ecological (Mack et al. 2000) and economic (Pimentel et al. 2005) impacts on ecosystems around the world. Invasive species can alter many ecosystem processes (Crooks 2002, Walker & Smith 1997) including: water and nutrient availability, such as form and amount of N if the soil (Evans et al. 2001, Sperry et al. 2006); primary productivity, through shifts in growth rates or efficiency of resource use; disturbance regimes, including the type, frequency, and severity of disturbances such as fire (D’Antonio 2002); and community dynamics, such as species replacements (Alvarez & Cushman 2002). The economic losses and …

Go to article

Moving Object Tracking: Seeking Extensible Solutions, Jeremy Pack Dec 2006

Moving Object Tracking: Seeking Extensible Solutions, Jeremy Pack

Undergraduate Honors Capstone Projects

Moving object tracking is a difficult field with no "best" solution. The documents contained here detail software that was developed in order to perform tracking of objects that are in the line of sight of multiple cameras. Some of the software developed is already in use by the US Army Dugway Proving Ground. Other software represents prototype or early development code. This software was written by Jeremy Pack, who was the lead programmer, and Luke Andrew at the Space Dynamics Laboratory in Logan, Utah.

Go to article

Mesospheric Gravity Waves Observed Near Equatorial And Low-Middle Latitude Stations: Wave Characteristics And Reverse Ray Tracing Results, C. M. Wrasse, T. Nakamura, H. Takahshi, A. F. Medeiros, Michael J. Taylor, D. Gobi, C. M. Denardini, J. Fechine, R. A. Buriti, A. Salatun, Suratno, E. Achmad, A. G. Admiranto Dec 2006

Mesospheric Gravity Waves Observed Near Equatorial And Low-Middle Latitude Stations: Wave Characteristics And Reverse Ray Tracing Results, C. M. Wrasse, T. Nakamura, H. Takahshi, A. F. Medeiros, Michael J. Taylor, D. Gobi, C. M. Denardini, J. Fechine, R. A. Buriti, A. Salatun, Suratno, E. Achmad, A. G. Admiranto

All Physics Faculty Publications

Gravity wave signatures were extracted from OH airglow observations using all-sky CCD imagers at four different stations: Cachoeira Paulista (CP) (22.7° S, 45° W) and São João do Cariri (7.4° S, 36.5° W), Brazil; Tanjungsari (TJS) (6.9° S, 107.9° E), Indonesia and Shigaraki (34.9° N, 136° E), Japan. The gravity wave parameters are used as an input in a reverse ray tracing model to study the gravity wave vertical propagation trajectory and to estimate the wave source region. Gravity waves observed near the equator showed a shorter period and a larger phase velocity than those waves observed at low-middle latitudes. …

Go to article

Public Engagement To Prioritize The Pastoral Research Agenda At The Pastoral And Agro-Pastoral Research Center Of Oari In Ethiopia, D. Layne Coppock, Getachew Gebru, Lemma Gizachew, Sintayehu Mesele, Mohammed Hassena, Solomon Desta Dec 2006

Public Engagement To Prioritize The Pastoral Research Agenda At The Pastoral And Agro-Pastoral Research Center Of Oari In Ethiopia, D. Layne Coppock, Getachew Gebru, Lemma Gizachew, Sintayehu Mesele, Mohammed Hassena, Solomon Desta

Environment and Society Faculty Publications

The Oromia Agricultural Research Institute (OARI) has a mandate to conduct agricultural and livestock research throughout the Regional State of Oromia in Ethiopia. OARI has recently opened a facility near Yabello town on the Borana Plateau called the Pastoral and Agro-Pastoral Research Center. A meeting was held in August 2006 at Yabello that involved representatives from pastoral communities, the private sector, government, and non-governmental organizations. The aim was to engage stakeholders in a process of problem prioritization and set the stage to create new partnerships to better address pressing problems. The final priorities included: addressing a general decline in forage …

Go to article

Changes In Land Cover And Soil Conditions For The Yabelo District Of The Borana Plateau, 1973-2003, D. Layne Coppock, Sintayehu Mesele, Heluf Gebrekidan, Lemma Gizachew Dec 2006

Changes In Land Cover And Soil Conditions For The Yabelo District Of The Borana Plateau, 1973-2003, D. Layne Coppock, Sintayehu Mesele, Heluf Gebrekidan, Lemma Gizachew

Environment and Society Faculty Publications

It has been proposed that the Borana Plateau has markedly changed in terms of land cover and land use in recent decades, but no hard data have been available to critically assess this claim. In addition, systematic analysis of soil properties has been limited. Research was designed to measure changes in land cover/land use over 30 years in the 400-km2 Yabelo District of southern Ethiopia using three satellite images taken at an average interval of 15 years. Samples were also collected to assess variation in the physical and chemical properties of dominant soils. Results indicated that Yabelo District has indeed …

Go to article

From Herd Diversification To Livelihood Diversification As A Response To Poverty: The Case Of The Waso Boran Of Northern Kenya, D. Layne Coppock, Abdullahi D. Jillo, Abdillahi A. Aboud Dec 2006

From Herd Diversification To Livelihood Diversification As A Response To Poverty: The Case Of The Waso Boran Of Northern Kenya, D. Layne Coppock, Abdullahi D. Jillo, Abdillahi A. Aboud

Environment and Society Faculty Publications

The Waso Boran of northern Kenya used to have large, mobile, and diverse herds of livestock that exploited equally large and diverse rangelands. Forty years of human population growth, drought, environmental change, and lack of relevant policies have altered this situation, however, with the majority of Waso Boran today being livestock poor and engaged in a variety of non-pastoral activities to diversify their livelihoods. One-third of 540 households we surveyed in Isiolo District now have ten head of cattle or less, and a larger census suggests that only 15 percent of households can currently be categorized as mobile pastoralists. The …

Go to article

First Prev Next Last