Physical Sciences and Mathematics Commons^™

Right Rate, Timing, Source And Placement: More Bang For The Pasture Fertilizer Buck, John H. Grove, Christopher D. Teutsch

Kentucky Grazing Conference

As we write this paper for the conference, fall fertilizer prices continue to increase, albeit at a slower pace than earlier this fall for most materials. The latest DTN retail price survey https://www.dtnpf.com/agriculture/web/ag/crops/article/2021/10/06/fertilizer‐price‐gains-losing‐steam has urea (46‐0‐0) at $620/ton, DAP (18‐46‐0) at $722/ton and potash (0‐ 0‐60) at $647/ton. This gives $0.675/lb N, $0.52/lb P₂O₅ (after the N value in DAP price was accounted for), and $0.54/lb K₂O. Compared to this time last year, urea, DAP and muriate of potash are 71, 64 and 92% higher, respectively. Other important materials used in Kentucky are also higher: …

An Integrated Approach To Weed Management In Pastures, Jonathan D. Green

Kentucky Grazing Conference

Weeds reduce the quantity and the stand life of desirable forage plants in pastures and diminish the palatability and quality of the forages available for livestock grazing. In some situations, certain weed species are potentially poisonous to grazing animals. The aesthetic value of a pasture is also impacted by weeds. Therefore, it is often desirable to implement weed management strategies that reduce the impact of weeds on pasture productivity.

Long‐Term Weather Trends And Implications For Grazing Operations In The Mid‐South, Matt Dixon

Kentucky Grazing Conference

Weather plays a large role in determining our agricultural production and management-related decisions throughout the growing season. In a couple examples, it controls when we can cut hay or when we are able/not able to graze (drought 2019). The short‐term shift in the weather pattern is always on the back of any farmers mind and how it’ll impact their own operation, but what about long‐term changes? These can be just as important. This can be tracked by looking at our climate, which is the average weather conditions over a specific period of time (usually 30 years). Unlike weather, which tells …

Introduction To Pasture Ecology, Ed Rayburn

Kentucky Grazing Conference

Pasture‐based livestock production is an integrated process. Plants intercept solar energy, take up soil water and minerals, making carbohydrates and proteins to feed themselves. Animals graze the pasture. Microbes in the animal’s rumen digest the forage and are then digested by the animal to provide energy, protein, and minerals for animal maintenance, growth, and milk production. Dead plant tops and roots along with manure and urine provide energy and protein to soil organisms. The soil organisms maintain soil pore space and structure, provide water infiltration and soil water holding capacity, and cycle nutrients into forms that can be taken up …

Foreword And Conference Information [2021], Christopher D. Teutsch, Jimmy C. Henning, S. Ray Smith

Kentucky Grazing Conference

No abstract provided.

Hydrogen/Deuterium Exchange Measurements May Provide An Incomplete View Of Protein Dynamics: A Case Study On Cytochrome, Pablo M Scrosati, Victor Yin, Lars Konermann

Chemistry Publications

Many aspects of protein function rely on conformational fluctuations. Hydrogen/deuterium exchange (HDX) mass spectrometry (MS) provides a window into these dynamics. Despite the widespread use of HDX-MS, it remains unclear whether this technique provides a truly comprehensive view of protein dynamics. HDX is mediated by H-bond-opening/closing events, implying that HDX methods provide an H-bond-centric view. This raises the question if there could be fluctuations that leave the H-bond network unaffected, thereby rendering them undetectable by HDX-MS. We explore this issue in experiments on cytochrome

Post-Polymerization ‘Click’ End-Capping Of Polyglyoxylate Self-Immolative Polymers, Peter G. Maschmeyer, Xiaoli Liang, Allison Hung, Oksana Ahmadzai, Annmaree L. Kenny, Yuan C. Luong, Timothy N. Forder, Haoxiang Zeng, Elizabeth R. Gillies, Derrick A. Roberts

Chemistry Publications

No abstract provided.

Bioadhesives, Mark Alan Helle, Chin Li Cheung

Department of Chemistry: Faculty Publications

Materials and methods for preparing reactive lignin and for preparing a bio - based adhesive are described herein.

Elastic Thickness And Crust-Mantle Interface Models Of Tharsis Bulge On Mars And Surrounding Areas, R. T. Ratheesh-Kumar, Dhananjay Ravat, Paul Morgan

Earth and Environmental Sciences Research Data

The datasets contain the final models of spatial variation of elastic thickness (Te) and the depth to Moho or the Crust-Mantle Interface (CMI) of the Tharsis Bulge and the surrounding regions derived from the software package LithoFLEX. The models are based on the crustal density of 2900 kg/m³, which was selected from analyzing results of a range of densities, and other standard lithospheric parameters. The models are useful for understanding the nature and evolution of the Tharsis Bulge and the surrounding regions.

Determining The Anthropogenic Effects On Eutrophication Of Utah Lake Since European Settlement Using Multiple Geochemical Approaches, Richard Ronald Rawle Williams

Theses and Dissertations

Recent urbanization of Utah Valley, Utah, has highlighted the impacts of anthropogenically-driven eutrophication of Utah Lake, which may lead to more frequent harmful algal blooms. To examine changes in trophic state, three freeze cores were taken from Utah Lake (Goshen Bay, Provo Bay, and near the Provo Boat Harbor) to examine the extent of eutrophication since European settlement. 210Pb and 137Cs chronologies were constructed for all three cores, although due to low supported 210Pb in the Provo Boat Harbor core, an additional pollen analysis was performed. Lower juniper pollen counts in addition to higher POACEAE (grasses and cereals) counts above …

Mgrre_Pureoilscouttickets_Copenhaver_3_21127021450000, Mgrre

Legacy Scout Tickets from Pure Oil Company

No abstract provided.

Method Of Making Temperature-Immune Self-Referencing Fabry–Pérot Cavity Sensors, Hengky Chandrahalim, Jonathan W. Smith

AFIT Patents

A method of making passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes forming a three-dimensional microscopic optical structure on a cleaved tip of an optical fiber that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.

Shape-Based Classification Of Partially Observed Curves, With Applications To Anthropology, Gregory J. Matthews, Karthik Bharath, Sebastian Kurtek, Juliet K. Brophy, George K. Thiruvathukal, Ofer Harel

Computer Science: Faculty Publications and Other Works

We consider the problem of classifying curves when they are observed only partially on their parameter domains. We propose computational methods for (i) completion of partially observed curves; (ii) assessment of completion variability through a nonparametric multiple imputation procedure; (iii) development of nearest neighbor classifiers compatible with the completion techniques. Our contributions are founded on exploiting the geometric notion of shape of a curve, defined as those aspects of a curve that remain unchanged under translations, rotations and reparameterizations. Explicit incorporation of shape information into the computational methods plays the dual role of limiting the set of all possible completions …

Organic Synthesis, Kevin M. Shea, Libretext

Open Educational Resources: Textbooks

My goal in writing this text is to help advanced undergraduates and beginning graduate students learn key topics in organic chemistry that often don't come up in your Organic I and II classes. So, you can think about this as an Organic III text. My focus is on key reaction types that enable the construction of complex organic molecules: pericyclic reactions, transition metal catalyzed reactions, rearrangements, fragmentations, radical reactions, and carbene reactions. I hope that this text is a resource that helps you understand the mechanisms of these reactions and enables you to use these reactions in your own syntheses. …

Informing Complexity: The Business Case For Managing Digital Twins Of Complex Process Facilities As A Valuable Asset, William Randell Mcnair

USF Tampa Graduate Theses and Dissertations

The Digital Twins of complex facilities, specifically 3D models created during their design, is a potentially valuable information asset. This three- article dissertation explores the business case for firms in the petrochemical process industry to manage throughout the facility lifecycle. A maturity model is provided to illustrate the stages of digital twin evolution and serves as a tool to help communicate each of the five levels of digital twin maturity achievable in various use cases. An industry analysis reviews existing literature and proposes a model to assess informing or insight value of digital twins from three perspectives. Next, an empirical …

A Comparison Of Bayesian Spatial Models For Hiv Mapping In South Africa, Kassahun Abere Ayalew, Samuel Manda, Bo Cai Ph.D.

Faculty Publications

Despite making significant progress in tackling its HIV epidemic, South Africa, with 7.7 million people living with HIV, still has the biggest HIV epidemic in the world. The Government, in collaboration with developmental partners and agencies, has been strengthening its responses to the HIV epidemic to better target the delivery of HIV care, treatment strategies and prevention services. Population-based household HIV surveys have, over time, contributed to the country’s efforts in monitoring and understanding the magnitude and heterogeneity of the HIV epidemic. Local-level monitoring of progress made against HIV and AIDS is increasingly needed for decision making. Previous studies have …

Assessing The Vertical Displacement Of The Grand Ethiopian Renaissance Dam During Its Filling Using Dinsar Technology And Its Potential Acute Consequences On The Downstream Countries, Hesham El-Askary, Amr Fawzy, Rejoice Thomas, Wenzhao Li, Nicholas Lahaye, Erik Linstead, 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, is currently under construction and has been filling at a fast rate without sufficient known analysis on possible impacts on the body of the structure. The filling of GERD not only has an impact on the Blue Nile Basin hydrology, water storage and flow but also poses massive risks in case of collapse. Rosaries Dam located in Sudan at only 116 km downstream of GERD, along with the 20 million Sudanese benefiting from that dam, would be seriously threatened in case of the collapse of GERD. In this …

Residential Curbside Recycle Context Analysis, Ntchanang Mpafe

USF Tampa Graduate Theses and Dissertations

Curbside recycling as a preferred mode of residential and municipal sustainability goals seems to have an overwhelming acceptance and adoption in the US. About 69.8 million out of 97.3 million (72%) single-family households in the United States have access to curbside recycling services (State of Curbside Recycling Report, 2020). Collectively, the programs divert about nine million tons of recyclables from landfill disposal each year (Cottom, 2019).

For a design that started in the 1980s in the US, its rapid universal adoption seems to have precluded a concerted effort in examining the coproduced nature (Households: service receptors and Municipalities: service providers) …

Texturing In Bi2Te3 Alloy Thermoelectric Materials: An Applied Physics Investigation, Oluwagbemiga P. Ojo

USF Tampa Graduate Theses and Dissertations

Thermoelectric devices provide the means for direct conversion between heat and electricity. The device conversion efficiency, or performance, is directly related to the thermoelectric figure of merit, ZT, of the working materials. Bismuth telluride alloys are the materials currently in use in most thermoelectric devices for near room temperature solid-state refrigeration and power conversion applications. The vast majority of publications in the literature on thermoelectricity report on investigations towards developing new materials with enhanced thermoelectric properties, however Bi₂Te₃ alloys have been used in thermoelectric devices for decades.

In this thesis, an investigation of crystallographic texturing on large …

Geology & Geography News, Georgia Southern University

Earth, Environment & Sustainability: News & Publications (2013-2021)

• Homecoming Alumni Breakfast 2021

Check Your Tech - The Ethics Of Gamification In Education, Dympna O'Sullivan, Ioannis Stavrakakis, Damian Gordon, Anna Becevel

Conference papers

No abstract provided.

Check Your Tech - The Ethics Of Deepfakes In A Political Context, Dympna O'Sullivan, Damian Gordon, Ioannis Stavrakakis, Michael Collins

Conference papers

No abstract provided.

Lateral Growth Of Xenon Hydrate Films On Mica, Avinash Kumar Both, Chin Li Cheung

Department of Chemistry: Faculty Publications

In this paper, we report an in situ optical microscopy study of lateral growth of xenon (Xe) hydrate thin films on mica at sub-zero temperatures. The interactions between a solid surface and water molecules can strongly affect the alignment of water molecules and induce ice-like ordered structures within the water layer at the water-surface interface. Mica was chosen as a model surface to study the surface effect of hydrophilic sheet silicates on the lateral growth of Xe hydrate films. Under the experimental conditions, the lateral growth of Xe hydrate films was measured to be at an average rapid rate of …

Radiocarbon Analyses Quantify Peat Carbon Losses With Increasing Temperature In A Whole Ecosystem Warming Experiment, Rachel M. Wilson, Natalie A. Griffiths, Ate Visser, Karis J. Mcfarlane, Stephen D. Sebestyen, Keith C. Oleheiser, Samantha Bosman, Anya M. Hopple, Malak M. Tfaily, Randall K. Kolka, Paul J. Hanson, Joel E. Kostka, Scott D. Bridgham, Jason K. Keller, Jeffrey P. Chanton

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Climate warming is expected to accelerate peatland degradation and release rates of carbon dioxide (CO2) and methane (CH4). Spruce and Peatlands Responses Under Changing Environments is an ecosystem-scale climate manipulation experiment, designed to examine peatland ecosystem response to climate forcings. We examined whether heating up to +9 °C to 3 m-deep in a peat bog over a 7-year period led to higher C turnover and CO2 and CH4 emissions, by measuring 14C of solid peat, dissolved organic carbon (DOC), CH4, and dissolved CO2 (DIC). DOC, a major substrate for heterotrophic respiration, increased significantly with warming. There was no 7-year trend …

A Network Of Transdisciplinary Observation Mechanisms As A Digital Source Of Knowledge On Rangeland, To Communicate And Exchange At Local, Regional And Global Scales, Alessandro Rizzo, El Hassane El Mahdad, Abdelfettah Sifeddine, S. Lucatello, Lhoussaine Bouchaou, Elisabeth Huber-Sannwald

IGC Proceedings (1977-2023)

For several decades, interventions geared towards the development of drylands have been the catalysts of much change in a rapidly evolving world, and learning how to build sustainable trajectories that take into account both cultural and contextual variations is becoming of increasingly great import. As local problems become intertwined, and given the difficulty of large-scale collective action, understanding these dynamics requires cognizance of all levels of knowledge governance systems and their interactions. So far as rangelands are concerned, the lack of easily accessible documentation encompassing all knowledge to date is a major impediment to their sustainable development. With this in …

Long-Term Socio-Ecological Research In The Biosphere Reserve In Mapimi, Mexico: A Multidimensional Participatory Observatory Of Rangeland/Pastoral Systems, V. M. Reyes Gómez, Elisabeth Huber-Sannwald, N. Martínez Tagüeña, I. Espejel Carvajal, S. Lucatello, M. A. Bowker, C. L. Lauterio Martínez

IGC Proceedings (1977-2023)

Since the creation of the UNESCO Biosphere Reserve Mapimi (BRM) in Mexico 45 years ago, pastoralism has undergone a series of transformations. Upon the arrival of the Spaniards, horse breeding flourished until 1900; thereafter extensive cattle production lasted for six decades. Only recently, farmers have adopted alternative management types for organic meat production. National and international efforts to achieve the Sustainable Development Goals (SDGs) require basic, applied, and participatory research efforts. In the socio-ecological pastoral system BRM, first halophytic ecosystems were examined for their ecohydrological role in rangeland productivity. In 1996, a long-term ecological research site was installed to monitor …

Re-Envisioning Global Rangeland Stewardship: An Ecosystem Services Assessment Framework, David D. Briske

IGC Proceedings (1977-2023)

Rangeland stewardship may be enhanced by transforming the global narrative from one of ‘resource scarcity and unpredictability’ to one of ‘global rangeland value’. This may be accomplished by devising a stewardship strategy founded on a more complete accounting of rangeland ecosystem services to inform land use planning and decision making. An ecosystem services framework may provide the necessary feedbacks to identify and assess potential tradeoffs among ecosystem services prior to implementing land use actions and policy. The ultimate goal of this alternative stewardship strategy would be to provide optimal combinations of ecosystem services to meet the needs of global citizens, …

Mongolian Herders’ Evaluation Of Rangeland Ecosystems Services, Values, And Changes Over The Past Decade, T. Ulambayar, B. Yunden, N. Davaasuren, S. Balt, D. Davaajav, B. Zambuu

IGC Proceedings (1977-2023)

Mongolia's rangeland is one of the largest remaining contiguous ecosystems encompassing 2.6% of the global grasslands, and almost three-fourths of the country's territory provides essential ecosystem services (ESS) for over 3 million Mongolians and 71 million livestock. The well-being of 171,605 pastoral households directly depends on the rangelands receiving provisional services in the forms of nutrition, material use and energy, regulatory services, and cultural services. This study explored herders' perceptions of these ESS, their evaluation for ESS values, and observations of ESS change for the last decade. The study found that Mongolian herders have more benefits from provisional ESS (on …

Conceptualizing Pastoral Development Based On Carbon Sequestration: The Case Of Yabelo District In The Southern Ethiopian Rangelands, D. L. Coppock

IGC Proceedings (1977-2023)

Major challenges for rangeland stewardship in the developing world include how to mitigate the spread of pastoral poverty and environmental degradation. Arresting such trends requires a scale of investment, policy incentives, and institutional commitments not previously observed in pastoral development. Indeed, such a rangeland revolution requires several global events to set the stage, namely: (1) Creation of markets for diverse ecosystem services; (2) recognition that improved rangeland stewardship is vital to mitigate climate change; and (3) distribution of green climate funds in support of local projects. New approaches for pastoral development projects are also needed. Previous projects have largely focused …

Wildlife Conservation And The Role Of The Indigenous Communities Living Around Conservation Areas, N. Parmisa, K. A. Galvin

IGC Proceedings (1977-2023)

The Indigenous Kenyan Maasai community has coexisted with the wildlife surrounding it for decades from Nairobi National Park, Maasai Mara and Amboseli. These parks border Maasai lands. Although the northern, eastern, and western perimeters of the Nairobi National Park are fenced, the southern part is not. It is at this point that the Maasai community’s land meets the park. This area also acts as a wildlife dispersal area where wildlife can freely migrate to other parks, including Maasai Mara and Amboseli. The park is only 117sq kms and its vitality depends on the plains to the south where the Maasai …