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Articles 15601 - 15630 of 16206
Full-Text Articles in Earth Sciences
Estimated 2020 Co2 Emission Reductions In Virginia’S Transportation Sector From Covid-19, Eden E. Rakes, Pamela R. Grothe, Jeremy S. Hoffman
Estimated 2020 Co2 Emission Reductions In Virginia’S Transportation Sector From Covid-19, Eden E. Rakes, Pamela R. Grothe, Jeremy S. Hoffman
Virginia Journal of Science
The initial lockdown phase of the COVID-19 pandemic presented an unfortunate opportunity to observe how abrupt, large-scale changes in traffic volume can reduce greenhouse gas emissions. This study explores how carbon dioxide (CO2) emissions from Virginia’s transportation sector may have been affected by the changes in activity stemming from COVID-19 to inform more carbon-neutral policies as the state recovers from the economic downfall. Emission savings were calculated by multiplying the percent change from 2019 to 2020 in traffic volume from the Virginia Department of Transportation with the business-as-usual 2020 U.S. Environmental Protection Agency estimate of CO2 emissions …
Determination Of Aquifer Parameters From Resistivity Data: A Case Of University Of Ilorin Campus, Northcentral Nigeria, Babatunde Onawola, Saminu Olatunji, Oluwatoyin Ologe, Razak Jimoh
Determination Of Aquifer Parameters From Resistivity Data: A Case Of University Of Ilorin Campus, Northcentral Nigeria, Babatunde Onawola, Saminu Olatunji, Oluwatoyin Ologe, Razak Jimoh
Tanzania Journal of Science
A total of twenty-one (21) vertical electrical sounding (VES) data were acquired using Pz-02 resistivity meter within the Precambrian basement area of part of Ilorin Metropolis north central Nigeria to evaluate the hydraulic characteristics of aquifers. The Schlumberger configuration with half-current electrode separation (AB/2) varying from 1 m to 60 m was used. The aquifer hydraulic characteristics such as hydraulic conductivity K and transmissivity T (Ωm2) were calculated from the interpreted VES data using the concept of Dar-Zarrouk parameters. The data, processed with computer software IPI2WIN, indicated three to four geo-electric layers, namely; topsoil, clayey (wet to dry), weathered or …
Forest Structure And Climate Change Mitigation Potential: A Case Of Wilolesi And Ikonongo Forested Hills In Iringa Municipality, Tanzania, Evarist Fundisha, Hamidu Seki, Anasia Saria
Forest Structure And Climate Change Mitigation Potential: A Case Of Wilolesi And Ikonongo Forested Hills In Iringa Municipality, Tanzania, Evarist Fundisha, Hamidu Seki, Anasia Saria
Tanzania Journal of Science
Vegetation plays major roles in carbon storage and ecosystem functioning by modifying the rate of carbon fluxes thereby mitigating climate change. However, the focus of assessing the potentials for different vegetation on climate change mitigation has for so long been conducted outside cities, towns and municipalities. This study was conducted in Wilolesi and Ikonongo hills located in Iringa as representative of the Municipality forested hills in Tanzania to assess vegetation structure and their potential for climate change mitigation. Random sampling technique was employed to establish 20 rectangular plots of 20 m x 40 m (0.08 ha) in each hill to …
Seismic Attributes Analysis As A Precursor To Hydrocarbon Indicators: A Case Study Of “Ok” Field, Niger Delta, Oluwatoyin Ologe, Mary Olowokere
Seismic Attributes Analysis As A Precursor To Hydrocarbon Indicators: A Case Study Of “Ok” Field, Niger Delta, Oluwatoyin Ologe, Mary Olowokere
Tanzania Journal of Science
Seismic data volume was employed to gain more insights into the complexities of the hydrocarbon hosting units within and outside the vicinity of well control in the OK-field Niger Delta to overcome wrong deductions from complexly faulted subsurface configuration for the oilfield exploration programme. The methodology involved integration of well log with seismic data, seismic structural analysis and seismic attributes analysis. Horizons and fault interpretations were carried out to produce subsurface attribute maps. Lithologic panels derived from well log data showed that the study area is characterized by sand-shale interbedding. Two hydrocarbon bearing reservoirs were delineated within the study interval, …
Hiv/Aids Transmission Dynamics: Modelling The Roles Of Long Distance Truck Drivers, Nyimvua Mbare
Hiv/Aids Transmission Dynamics: Modelling The Roles Of Long Distance Truck Drivers, Nyimvua Mbare
Tanzania Journal of Science
A mathematical model to investigate the roles of long distance truck drivers on HIV transmission dynamics was formulated and analyzed to establish the existence of disease free and endemic equilibrium points. The results show that, the disease free equilibrium point is asymptotically stable when the basic reproduction number is less than unity and unstable otherwise. Furthermore, comprehensive analyses on the two steady states (infection free and endemic) have shown that they are both globally and asymptotically stable. Sensitivity analysis is performed on the reproduction number in order to establish the relative importance of parameters, and it shows that the truck …
Analyzing The Electricity Consumption And Costs Of Electrical-Powered Machines When There Is Orepass Failure In Underground Mine, Bartłomiej Skawina, Abubakary Salama
Analyzing The Electricity Consumption And Costs Of Electrical-Powered Machines When There Is Orepass Failure In Underground Mine, Bartłomiej Skawina, Abubakary Salama
Tanzania Journal of Science
In underground mining environment where the loss of orepasses is a dominant factor, the mine may face a challenge of improving the loading and hauling operations. Some of the options will be to rehabilitate the lost orepasses, or developing the new ones. When the rehabilitation cost is high, alternative strategies should be applied to compensate for the orepasses failure. One of the possible options is to use diesel or electric Load-Haul-Dumps (LHDs). The use of diesel-powered LHDs will increase heat and gas emissions which increase environmental concerns and ventilation costs, while adoption of electric-powered vehicles needs to be analysed. Therefore, …
Mineralogy And Geochemistry Of Shale-Hosted Copper Of The Middle Buanji Group, Chimala Area, South-Western Tanzania, Almachius Mutasingwa, Michael Msabi, Neema Jackson, Seetharamaiah Jagarlamudi
Mineralogy And Geochemistry Of Shale-Hosted Copper Of The Middle Buanji Group, Chimala Area, South-Western Tanzania, Almachius Mutasingwa, Michael Msabi, Neema Jackson, Seetharamaiah Jagarlamudi
Tanzania Journal of Science
The mineralogical and geochemical assessments are presented in this paper to constrain the mineralogy and copper concentrations of the shale-hosted copper in the Middle Buanji Group of the Upper Paleoproterozoic (1.67 Ga). The XRD analysis revealed that illite and chamosite are the major clay minerals present in the shales together with pseudomalachite, quartz, and muscovite that constitute over 95% by proportion of the sample. The minerals biotite, birnessite, ferroselite, bearsite, chloritoid, and anatase are present in association with shale-hosted copper in low amounts (i.e., <5% by proportion of the sample). The pseudomalachite [Cu5(PO4)2(OH)4] is considered as ore mineral of copper in the shales of the Middle Buanji Group. Field observations revealed the presence of different shale layers within the Middle Buanji Group such as red, grey and green/blue in which copper mineral is distributed. On average, the copper concentrations in the shale layers were unevenly distributed throughout the red-grey-green shales layers with values of 0.31 wt%, 5.2 wt% and 13.19 wt%, respectively. A noticeable amount of copper mineralization up to 25.7 wt% was restricted within the green shale layer as compared to red (0.31 wt%) and grey (10.9 wt%) layers. Keywords: Pseudomalachite; Supergene enrichment; Shale-hosted copper; Green shale layer
An Assessment Of The Filling Process Of The Grand Ethiopian Renaissance Dam And Its Impact On The Downstream Countries, Prakrut Kansara, Wenzhao Li, Hesham El-Askary, Venkat Lakshmi, Thomas Piechota, Daniele Struppa, Mohamed Abdelaty Sayed
An Assessment Of The Filling Process Of The Grand Ethiopian Renaissance Dam And Its Impact On The Downstream Countries, Prakrut Kansara, Wenzhao Li, Hesham El-Askary, Venkat Lakshmi, Thomas Piechota, Daniele Struppa, Mohamed Abdelaty Sayed
Mathematics, Physics, and Computer Science Faculty Articles and Research
The Grand Ethiopian Renaissance Dam (GERD), formerly known as the Millennium Dam, has been filling at a fast rate. This project has created issues for the Nile Basin countries of Egypt, Sudan, and Ethiopia. The filling of GERD has an impact on the Nile Basin hydrology and specifically the water storages (lakes/reservoirs) and flow downstream. In this study, through the analysis of multi-source satellite imagery, we study the filling of the GERD reservoir. The time-series generated using Sentinel-1 SAR imagery displays the number of classified water pixels in the dam from early June 2017 to September 2020, indicating a contrasting …
Carbon Isotope Discrimination, Selection Response, And Forage Production Of Tall Fescue In Contrasting Environments, R. C. Johnson, Andrew A. Hopkins, M. A. Evans
Carbon Isotope Discrimination, Selection Response, And Forage Production Of Tall Fescue In Contrasting Environments, R. C. Johnson, Andrew A. Hopkins, M. A. Evans
IGC Proceedings (1977-2023)
No abstract provided.
Selection Of Panicum Maximum Genotypes Under Different Shade Levels, Liana Jank, M. M. Gontijo Neto, V. A. Laura, Rosangela M. S. Resende, Cacilda Borges Do Valle
Selection Of Panicum Maximum Genotypes Under Different Shade Levels, Liana Jank, M. M. Gontijo Neto, V. A. Laura, Rosangela M. S. Resende, Cacilda Borges Do Valle
IGC Proceedings (1977-2023)
No abstract provided.
Development Of Improved Wheatgrasses For The Southern Great Plains Of The Usa, Andrew A. Hopkins
Development Of Improved Wheatgrasses For The Southern Great Plains Of The Usa, Andrew A. Hopkins
IGC Proceedings (1977-2023)
No abstract provided.
The Development Of Talish Clover (Trifolium Tumens Steven Ex M. Bieb.) As A Potential New Perennial Pasture Legume For Low Rainfall Temperate Environments, Eric J. Hall, A. M. Hurst
The Development Of Talish Clover (Trifolium Tumens Steven Ex M. Bieb.) As A Potential New Perennial Pasture Legume For Low Rainfall Temperate Environments, Eric J. Hall, A. M. Hurst
IGC Proceedings (1977-2023)
No abstract provided.
Dactylis Glomerata Ssp. Hispanica (Roth) Nyman, Cultivars Uplands And Sendace, Drought Tolerant Forage Grasses For Temperate Environments, Eric J. Hall, P. A. Lane, A. M. Hurst
Dactylis Glomerata Ssp. Hispanica (Roth) Nyman, Cultivars Uplands And Sendace, Drought Tolerant Forage Grasses For Temperate Environments, Eric J. Hall, P. A. Lane, A. M. Hurst
IGC Proceedings (1977-2023)
No abstract provided.
Germplasm Improvement In Pasture Legumes By Developing Core Collections, K. Ghamkhar, R. Snowball, M. Ryan, Ph. Nichols, R. Appels
Germplasm Improvement In Pasture Legumes By Developing Core Collections, K. Ghamkhar, R. Snowball, M. Ryan, Ph. Nichols, R. Appels
IGC Proceedings (1977-2023)
No abstract provided.
Techniques For Artificial Hybridization In The Self‐Pollinated Forage Legume Bituminaria Bituminosa And The Cross‐Pollinated Forage Legume Hedysarum Coronarium, D. Real, K. Foster, Enrique Correal, D. Kidd, P. Mendez
Techniques For Artificial Hybridization In The Self‐Pollinated Forage Legume Bituminaria Bituminosa And The Cross‐Pollinated Forage Legume Hedysarum Coronarium, D. Real, K. Foster, Enrique Correal, D. Kidd, P. Mendez
IGC Proceedings (1977-2023)
No abstract provided.
Establishment Of Perennial Forage Crops Using Fast‐Growing Short‐Lived Grasses As Companion Crops, Bruce E. Coulman, Cheryl Duncan, Tim Nelson, Arend Kleinhout
Establishment Of Perennial Forage Crops Using Fast‐Growing Short‐Lived Grasses As Companion Crops, Bruce E. Coulman, Cheryl Duncan, Tim Nelson, Arend Kleinhout
IGC Proceedings (1977-2023)
No abstract provided.
Carbon Fluxes And Microbial Activities From Boreal Peatlands Experiencing Permafrost Thaw, M. P. Waldrop, J. W. Mcfarland, K. L. Manies, M. C. Leewis, S. J. Blazewicz, M. C. Jones, R. B. Neumann, Jason K. Keller, L. Cohen, E. S. Euskirchen, C. Edgar, M. R. Turetsky, W. L. Cable
Carbon Fluxes And Microbial Activities From Boreal Peatlands Experiencing Permafrost Thaw, M. P. Waldrop, J. W. Mcfarland, K. L. Manies, M. C. Leewis, S. J. Blazewicz, M. C. Jones, R. B. Neumann, Jason K. Keller, L. Cohen, E. S. Euskirchen, C. Edgar, M. R. Turetsky, W. L. Cable
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Permafrost thaw in northern ecosystems may cause large quantities of carbon (C) to move from soil to atmospheric pools. Because soil microbial communities play a critical role in regulating C fluxes from soils, we examined microbial activity and greenhouse gas production soon after permafrost thaw and ground collapse (into collapse‐scar bogs), relative to the permafrost plateau or older thaw features. Using multiple field and laboratory‐based assays at a field site in interior Alaska, we show that the youngest collapse‐scar bog had the highest CH4 production potential from soil incubations, and, based upon temporal changes in porewater concentrations and 13 …
The Forage Selection Program At The Cerrados Research Center--33 Years Of Contributions For The Tropics, Marcelo A. Carvalho, Claudio T. Karia, A. O. Barcellos, G. G. Leite, Lourival Vilela, Allan K. B. Ramos, Francisco Duarte Fernandes, S. V. Paula-Moraes, G. B. Martha Júnior, R. Guimarães Júnior
The Forage Selection Program At The Cerrados Research Center--33 Years Of Contributions For The Tropics, Marcelo A. Carvalho, Claudio T. Karia, A. O. Barcellos, G. G. Leite, Lourival Vilela, Allan K. B. Ramos, Francisco Duarte Fernandes, S. V. Paula-Moraes, G. B. Martha Júnior, R. Guimarães Júnior
IGC Proceedings (1977-2023)
No abstract provided.
Tiller Development Of Three Bromegrass (Bromus) Species Following Defoliation, Biligetu, B. E. Coulman
Tiller Development Of Three Bromegrass (Bromus) Species Following Defoliation, Biligetu, B. E. Coulman
IGC Proceedings (1977-2023)
No abstract provided.
Heritability And Genetic Correlations Of Forage Yield Traits In Alfalfa (Medicago Sativa L.) For Central Valley Of Mexico, B. Alarcon‐Zuniga, R. Perdomo‐Gomez
Heritability And Genetic Correlations Of Forage Yield Traits In Alfalfa (Medicago Sativa L.) For Central Valley Of Mexico, B. Alarcon‐Zuniga, R. Perdomo‐Gomez
IGC Proceedings (1977-2023)
No abstract provided.
Genetic Diversity Of Hemarthria Compressa Germplasm In Southwest China Detected By Issr Markers, Fang Li, Yan Fan, Xinquan Zhang, Xiao Ma
Genetic Diversity Of Hemarthria Compressa Germplasm In Southwest China Detected By Issr Markers, Fang Li, Yan Fan, Xinquan Zhang, Xiao Ma
IGC Proceedings (1977-2023)
No abstract provided.
Insect Reproductive Behaviors Are Important Mediators Of Carrion Nutrient Release Into Soil, Brooke K. Woelber-Kastner, Serita D. Frey, Daniel R. Howard, Carrie L. Hall
Insect Reproductive Behaviors Are Important Mediators Of Carrion Nutrient Release Into Soil, Brooke K. Woelber-Kastner, Serita D. Frey, Daniel R. Howard, Carrie L. Hall
Faculty Publications
Current declines in terrestrial insect biomass and abundance have raised global concern for the fate of insects and the ecosystem services they provide. However, the ecological and economic contributions of many insects have yet to be quantified. Carrion-specializing invertebrates are important mediators of carrion decomposition; however, the role of their reproductive activities in facilitating this nutrient pulse into ecosystems is poorly understood. Here, we investigate whether insects that sequester carrion belowground for reproduction alter soil biotic and abiotic properties in North American temperate forests. We conducted a field experiment that measured soil conditions in control, surface carrion alone, and beetle-utilized …
Agrobacterium‐Mediated Genetic Transformation Of Elymus Breviaristatus With Pseudomonas Pseudoalcaligenes Insecticidal Protein Gene, Daxu Li, Shiqie Bai, Gang Liu, Minghong You
Agrobacterium‐Mediated Genetic Transformation Of Elymus Breviaristatus With Pseudomonas Pseudoalcaligenes Insecticidal Protein Gene, Daxu Li, Shiqie Bai, Gang Liu, Minghong You
IGC Proceedings (1977-2023)
No abstract provided.
Improvement Of Forage Grass Quality For Future Climate And Agricultural Demands, C. S. Jensen, T. Didion, G. Gadegaard, I. Lenk, C. Gao, M. Folling, R. Sabroe, K. K. Nielsen
Improvement Of Forage Grass Quality For Future Climate And Agricultural Demands, C. S. Jensen, T. Didion, G. Gadegaard, I. Lenk, C. Gao, M. Folling, R. Sabroe, K. K. Nielsen
IGC Proceedings (1977-2023)
No abstract provided.
Metabolic Response Of Lolium Perenne To Drought Stress, Heike Hahn, J. Kopka, Oliver Fiehn, B. Scott
Metabolic Response Of Lolium Perenne To Drought Stress, Heike Hahn, J. Kopka, Oliver Fiehn, B. Scott
IGC Proceedings (1977-2023)
No abstract provided.
Nutrients Intake By The Ile‐De‐France Lambs Fed Up With Diets Containing Sugar Cane Forage Variety Or Corn Silage, A. G. Silva Sobrinho, G. M. B. Moreno, A. G. Leão, C. M. B. Loureiro, A. A. M. Sampaio
Nutrients Intake By The Ile‐De‐France Lambs Fed Up With Diets Containing Sugar Cane Forage Variety Or Corn Silage, A. G. Silva Sobrinho, G. M. B. Moreno, A. G. Leão, C. M. B. Loureiro, A. A. M. Sampaio
IGC Proceedings (1977-2023)
No abstract provided.
So42- Uptake And Its Assimilation In The Different Genotypes Of Rape On The S‐Deficient, Lushen Li, Yulan Jin, Bok-Rye Lee, Woo-Jin Jung, Tae-Hwan Kim
So42- Uptake And Its Assimilation In The Different Genotypes Of Rape On The S‐Deficient, Lushen Li, Yulan Jin, Bok-Rye Lee, Woo-Jin Jung, Tae-Hwan Kim
IGC Proceedings (1977-2023)
No abstract provided.
Problems Of Grass Feed Quality Providing And Its Influence On Animals Health, Baiba Osmane, Aleksandrs Jemeljanovs, Jānis Blūzmanis
Problems Of Grass Feed Quality Providing And Its Influence On Animals Health, Baiba Osmane, Aleksandrs Jemeljanovs, Jānis Blūzmanis
IGC Proceedings (1977-2023)
No abstract provided.
Use Of By‐Products Derived From Neem Tree (Azadirachta Indica) In Livestock Production, W. Z. Yang, B. N. Ametaj
Use Of By‐Products Derived From Neem Tree (Azadirachta Indica) In Livestock Production, W. Z. Yang, B. N. Ametaj
IGC Proceedings (1977-2023)
No abstract provided.
Fodder Availability And Nutritive Value Of Two Sahelian Browse Plants: Acacia Senegal And Pterocarpus Lucens, H. O. Sanon, F. Ouattara, I. Ledin
Fodder Availability And Nutritive Value Of Two Sahelian Browse Plants: Acacia Senegal And Pterocarpus Lucens, H. O. Sanon, F. Ouattara, I. Ledin
IGC Proceedings (1977-2023)
No abstract provided.