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Articles 70081 - 70110 of 294774

Full-Text Articles in Physical Sciences and Mathematics

Re-Envisioning Global Rangeland Stewardship: An Ecosystem Services Assessment Framework, David D. Briske Oct 2021

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, …

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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 Oct 2021

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 …

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Conceptualizing Pastoral Development Based On Carbon Sequestration: The Case Of Yabelo District In The Southern Ethiopian Rangelands, D. L. Coppock Oct 2021

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 …

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Wildlife Conservation And The Role Of The Indigenous Communities Living Around Conservation Areas, N. Parmisa, K. A. Galvin Oct 2021

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 …

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Whose Knowledge Counts?: Irrigation Development In Turkana, Kenya (1963-2019), G. L. Akall Oct 2021

Whose Knowledge Counts?: Irrigation Development In Turkana, Kenya (1963-2019), G. L. Akall

IGC Proceedings (1977-2023)

Irrigation has long been promoted in Africa’s drylands as a means to improve food security and livelihoods. Turkana County, one of the driest regions of Kenya, has a long history of irrigation interventions, extending from the colonial era to the present. The recent discovery of two huge water aquifers in the arid Turkana region, Kenya’s Vision 2030 and devolution has fed into enthusiasm for irrigation as an excellent solution to the multiple problems in the region against other activities like pastoralism. This is in spite of a history of failed irrigation developments in Turkana (Hogg 1987). This paper explores the …

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Co-Produced Research Supports Pastoralists To Pursue Transformative Social And Ecological Change In Rangelands, R. S. Reid, K-A. S. Kassam, T. Pickering, A. Yasin, Chantsallkham Jamsranjav, Khishigbayar Jamiyansharav, Tungalag Ulambayar, Corrine N. Knapp Oct 2021

Co-Produced Research Supports Pastoralists To Pursue Transformative Social And Ecological Change In Rangelands, R. S. Reid, K-A. S. Kassam, T. Pickering, A. Yasin, Chantsallkham Jamsranjav, Khishigbayar Jamiyansharav, Tungalag Ulambayar, Corrine N. Knapp

IGC Proceedings (1977-2023)

Over the last two decades, pastoralists and researchers have formed powerful alliances to transform how we think about and do research-with-action in rangelands. These alliances promote faster learning about problems and their potential solutions by bringing together diverse partners and their different ways of understanding important issues. They also ensure research is fully relevant to real problems, so it supports pastoralists to act on both old and new issues that they face. While these approaches can be contentious when perspectives and experiences do not align, team members are finding them transformative, if they commit to working together over the long …

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Land Use Planning For Resilient Pastoral Rangelands: Greater Serengeti Mara Ecosystem, Y. M. Said, B. J. Graae, M. Nielsen, H. P. Hartstean Oct 2021

Land Use Planning For Resilient Pastoral Rangelands: Greater Serengeti Mara Ecosystem, Y. M. Said, B. J. Graae, M. Nielsen, H. P. Hartstean

IGC Proceedings (1977-2023)

Greater Serengeti Mara Ecosystem (GSME) encompasses large protected areas of savanna with iconic wildlife surrounded by pastoralists and farms. GSME is facing severe pressure from human-induced changes due to rapid increase in population and climate variability. We undertook surveys with local communities to understand the potential impacts of these changes on wildlife and livelihoods of communities. We visited eight villages in Kenya and Tanzania and discussed with local communities and leaders, park management on drivers of change, and wishes for future development. To facilitate the conversation, we developed posters with four scenarios as a basis for discussions and a board …

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Producing Useful Knowledge For Sustainable Development, K. A. Galvin Oct 2021

Producing Useful Knowledge For Sustainable Development, K. A. Galvin

IGC Proceedings (1977-2023)

Africa makes a relatively minor contribution to global greenhouse gas emissions compared with developed nations, yet the African continent will be increasingly vulnerable to climate change processes in the coming decades. Critical challenges include meeting basic needs for food, water, shelter, and other necessities without undermining biodiversity and ecosystem services. Coordination efforts to address multiple global change related stressors has generally occurred at the national level and taken an external approach, with national governments favoring collaboration with foreign-based NGOs and other international institutions. However, the involvement of actors at the local level correlates with decisions that are better adapted to …

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Mega-Herbivores, Plants And Soils, Jennifer Adams Krumins Oct 2021

Mega-Herbivores, Plants And Soils, Jennifer Adams Krumins

Sustainability Seminar Series

Ecosystem and plant ecologists understand that herbivory can have a profound influence on primary production and plant community structure. This can be seen in mass outbreaks of insect herbivores or the grazing activity of ungulate herds. Likewise, the same ecologists understand that plants interact closely in a bidirectional relationship with soil organisms and the ecosystem properties they moderate. Therefore, logically we hypothesize that herbivory will have either a direct effect on soil communities and their functioning, or at minimum, an indirect effect on the soils via the plants they support. My sabbatical research included participation in multiple programs studying the …

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A Clark-Ocone Type Formula Via Itô Calculus And Its Application To Finance, Takuji Arai, Ryoichi Suzuki Oct 2021

A Clark-Ocone Type Formula Via Itô Calculus And Its Application To Finance, Takuji Arai, Ryoichi Suzuki

Journal of Stochastic Analysis

No abstract provided.

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Relationships Among Toilet Sharing, Water Source Locations, And Handwashing Places Without Observed Soap: A Cross-Sectional Study Of The Richest Households In Bangladesh, Mazbahul G. Ahamad, Mark Burbach, Fahian Tanin Oct 2021

Relationships Among Toilet Sharing, Water Source Locations, And Handwashing Places Without Observed Soap: A Cross-Sectional Study Of The Richest Households In Bangladesh, Mazbahul G. Ahamad, Mark Burbach, Fahian Tanin

School of Natural Resources: Faculty Publications

Background: A high percentage of the richest households in Bangladesh lack soap at their handwashing places, a problem that is typically considered to be one of the poor. Objective: We investigated toilet sharing practices, locations of water sources, and relevant sociodemographic factors associated with the observed handwashing places that lack soap in the richest (ninth wealth decile) households in Bangladesh. Methods: We used data from the 2017-18 Bangladesh Demographic and Health (BDHS) Survey. Logistic regression technique was used to investigate how toilet sharing practices, water source locations, and different sociodemographic factors were associated with observed handwashing places without soap. Results: …

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Ferromagnetic Resonances In Single-Crystal Yttrium Iron Garnet Nanofilms Fabricated By Metal-Organic Decomposition, Szu Fan Wang, Kayetan Chorazewicz, Suvechhya Lamichhane, Ronald A. Parrott, Stefano Cabrini, Peter Fischer, Noah Kent, John H. Turner, Takayuki Ishibashi, Zachary Parker Frohock, Jacob J. Wisser, Peng Li, Ruthi Zielinski, Bryce Herrington, Yuri Suzuki, Mingzhong Wu, Keiko Munechika, Carlos Pina-Hernandez, Robert Streubel, Allen A. Sweet Oct 2021

Ferromagnetic Resonances In Single-Crystal Yttrium Iron Garnet Nanofilms Fabricated By Metal-Organic Decomposition, Szu Fan Wang, Kayetan Chorazewicz, Suvechhya Lamichhane, Ronald A. Parrott, Stefano Cabrini, Peter Fischer, Noah Kent, John H. Turner, Takayuki Ishibashi, Zachary Parker Frohock, Jacob J. Wisser, Peng Li, Ruthi Zielinski, Bryce Herrington, Yuri Suzuki, Mingzhong Wu, Keiko Munechika, Carlos Pina-Hernandez, Robert Streubel, Allen A. Sweet

Robert Streubel Papers

Tunable microwave and millimeter wave oscillators and bandpass filters with ultra-low phase noise play a critical role in electronic devices, including wireless communication, microelectronics, and quantum computing. Magnetic materials, such as yttrium iron garnet (YIG), possess ultra-low phase noise and a ferromagnetic resonance tunable up to tens of gigahertz. Here, we report structural and magnetic properties of single-crystal 60 and 130 nm-thick YIG films prepared by metal-organic decomposition epitaxy. These films, consisting of multiple homoepitaxially grown monolayers, are atomically flat and possess magnetic properties similar to those grown with liquid-phase epitaxy, pulsed laser deposition, and sputtering. Our approach does not …

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Structural And Morphological Properties Of Wool Keratin And Cellulose Biocomposites Fabricated Using Ionic Liquids, Karleena Rybacki, Stacy A. Love, Bailey Blessing, Abneris Morales, Emily Mcdermott, Kaylyn Cai, Xiao Hu, David Salas-De La Cruz Oct 2021

Structural And Morphological Properties Of Wool Keratin And Cellulose Biocomposites Fabricated Using Ionic Liquids, Karleena Rybacki, Stacy A. Love, Bailey Blessing, Abneris Morales, Emily Mcdermott, Kaylyn Cai, Xiao Hu, David Salas-De La Cruz

College of Science & Mathematics Departmental Research

In this study, the structural, thermal, and morphological properties of biocomposite films composed of wool keratin mixed with cellulose and regenerated with ionic liquids and various coagulation agents were characterized and explored. These blended films exhibit different physical and thermal properties based on the polymer ratio and coagulation agent type in the fabrication process. Thus, understanding their structure and molecular interaction will enable an understanding of how the crystallinity of cellulose can be modified in order to understand the formation of protein secondary structures. The thermal, morphological, and physiochemical properties of the biocomposites were investigated by Fourier transform infrared (FTIR) …

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Mine Water Drainage Pollution In China's Coal Mining Areas And The Construction Of Prevention And Control Technical System, Sun Yajun, Xu Zhimin, Li Xin, Zhang Li, Chen Ge, Zhao Xianming, Gao Yating, Liu Qi, Zhang Shangguo, Wang Weijun, Zhu Lulu, Wang Sheng Oct 2021

Mine Water Drainage Pollution In China's Coal Mining Areas And The Construction Of Prevention And Control Technical System, Sun Yajun, Xu Zhimin, Li Xin, Zhang Li, Chen Ge, Zhao Xianming, Gao Yating, Liu Qi, Zhang Shangguo, Wang Weijun, Zhu Lulu, Wang Sheng

Coal Geology & Exploration

Mining activities are bound to produce enormous mine water drainage. Mine water in China shows relatively poor water quality and high cost of water treatment and other problems. Firstly, the main characteristics of mine water quality in China's typical mine areas are clarified in this paper: conventional ions are the main chemical components causing poor mine water quality; mine water has a small proportion of toxic and harmful substances, which is generally better than the quality standard of class Ⅲ groundwater. Secondly, some scientific issues on the formation and evolution of mine water quality are discussed in detail, including the …

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Gas Emission-Based Determination Of The Reasonable Driving Speed In Coal Roadway, Fu Shuai, Si Qingmin, Wang Qifei, Guo Xinyao, Zhang Hongtu Oct 2021

Gas Emission-Based Determination Of The Reasonable Driving Speed In Coal Roadway, Fu Shuai, Si Qingmin, Wang Qifei, Guo Xinyao, Zhang Hongtu

Coal Geology & Exploration

Scientific determination of the tunneling speed is an important prerequisite for the safe and efficient production in coal mines with high gas and outburst. In order to determine the reasonable driving speed of coal roadway and reduce the occurrence of dynamic disasters in coal roadway driving, the distribution law of gas in roadway head was analyzed, the mathematical model was established. Gas emission characteristics were also analyzed at different driving speeds based on the model. Taking Jinhui Wanfeng Coal Mine as an example, the reasonable driving speed was determined in this coal mine based on its gas emission characteristics. Results …

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Discussion On Overburden Zoning Model After Mining And Its Engineering Significance, Lyu Yuguang, Qiao Wei, Cheng Jianyuan, Cui Ping Oct 2021

Discussion On Overburden Zoning Model After Mining And Its Engineering Significance, Lyu Yuguang, Qiao Wei, Cheng Jianyuan, Cui Ping

Coal Geology & Exploration

The mechanical state of overburden after mining is directly related to roof accidents and roof water disasters, so it is necessary to study the overburden structure after mining. The "New Four Zones" model of overburden structure is proposed: caving zone, fracture zone, bedrock separation zone and loose alluvium zone. Combined with the previous "Three Zones" model and "Four Zones" model, this paper makes a spatial comparative analysis to clarify the spatial relationship of the three zoning models. It discusses the scientific nature of the "New Four Zones" model in terms of the influence of mining on water level of the …

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Statistical Regularity Of Physical And Mechanical Indexes Of Secondary Red Clay In Chenggong District, Kunming, Gao Haiyan, Zhang Jiaming Oct 2021

Statistical Regularity Of Physical And Mechanical Indexes Of Secondary Red Clay In Chenggong District, Kunming, Gao Haiyan, Zhang Jiaming

Coal Geology & Exploration

In order to analyze the statistical regularity of physical and mechanical indexes of secondary red clay in Chenggong District, Kunming, the index data of 275 groups of secondary red clay samples from 69 geotechnical investigation boreholes in Wujiaying area of Chenggong are taken as the research object. Based on the statistical analysis principle, the variation range, average value, standard deviation, coefficient of variation of 13 indexes and the correlation between indexes and depth are analyzed by SPSS statistical analysis software, and the physical and mechanical properties of secondary red clay are summarized. Then, the linear empirical formula between indexes is …

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Distribution Characteristics And Paleo-Climatic Significance Of Continental Climate-Sensitive Sediments In The Late Cretaceous In China, Bin Xu, Fang Xiang, Shuxia Li Oct 2021

Distribution Characteristics And Paleo-Climatic Significance Of Continental Climate-Sensitive Sediments In The Late Cretaceous In China, Bin Xu, Fang Xiang, Shuxia Li

Coal Geology & Exploration

The Cretaceous is a typical period for studying the greenhouse climate and the earth system interactions, and the world's most extensive terrestrial strata are mainly in East Asia, especially in China. Continental sediments can effectively reflect the paleo-climate change, but the previous studies of the Late Cretaceous paleo-climate, based on the combined characteristics of continental climate-sensitive sediments, were barely found in China. To obtain the Late Cretaceous paleo-climate characteristics of China, the distribution characteristics of different continental climate-sensitive sediment types in the early, middle and Late Cretaceous in China were studied in detail. According to the distribution and combination characteristics …

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Influence Of Surrounding Rock Changes On The Coal Seam Reflected Wave Under Thin Interbed Condition, Chang Suoliang, Zhang Sheng, Liu Jing, Liu Zuiliang, Chen Qiang, Liu Bo Oct 2021

Influence Of Surrounding Rock Changes On The Coal Seam Reflected Wave Under Thin Interbed Condition, Chang Suoliang, Zhang Sheng, Liu Jing, Liu Zuiliang, Chen Qiang, Liu Bo

Coal Geology & Exploration

In order to study the influence of the changes of surrounding rock on the reflected wave of coal seam under the condition of thin interbeds, the coal-bearing strata in the λ/4 thin layer range in seismic exploration is taken as the research object, and three types of models of surrounding rock lithology, thickness and structure change are established. By Brekhovskikh equation in the theory of thin-bed reflection coefficient spectrum, the influence of surrounding rock changes on the AVO curve, attributes and gathers of coal seams are calculated and summarized. The research results show that the changes of surrounding rock …

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Research On Three-Component Response Of Ground-Airborne Tem Considering Emission Current Waveform, Hou Yanwei, Guo Jianlei, Si Yinnyu, Jiang Tao Oct 2021

Research On Three-Component Response Of Ground-Airborne Tem Considering Emission Current Waveform, Hou Yanwei, Guo Jianlei, Si Yinnyu, Jiang Tao

Coal Geology & Exploration

The ground-airborne TEM has received more and more attention in coal goaf exploration and other fields. In order to provide a theoretical basis for the processing and interpretation of ground-airborne transient electromagnetic data, it is necessary to study the influence of the transmitted current waveform parameter on the three-component response characteristics of ground-airborne TEM. Taking trapezoidal waves as an example, this article firstly studies the frequency distribution of different emission current waveform, and then investigates the effects of the rising edge time, pulse width and turn-off time of the transmitted waveform on the three-component magnetic field response of ground-air transient …

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Research And Application Of Horizontal Wire-Line Directional Deviation Correction While Drilling, Wu Jinsheng, Huang Xiaolin, Jiang Bing, Zhang Chi, Wu Wanjiong Oct 2021

Research And Application Of Horizontal Wire-Line Directional Deviation Correction While Drilling, Wu Jinsheng, Huang Xiaolin, Jiang Bing, Zhang Chi, Wu Wanjiong

Coal Geology & Exploration

In wire-line core drilling of horizontal holes, the rotation axis of the drilling tool is not in a straight line with its own gravity direction; with the ground hole pressurized, the drilling trajectory will be deviated due to the soft and hard formation or the occurrence of the rock formation. At present, there is no effective way to achieve directional deviation correction while drilling. This paper studies the pushing, fixing and fishing technologies of small-diameter horizontal wire-line directional instruments while drilling. A set of horizontal rope directional drilling tools and directional technology are developed and applied in directional deviation correction …

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Design And Application Of Pdc Bit For Large Diameter Directional Drilling Of Coal Seam Roof With Double Stage And Double Speed, Gao Xiaoliang, Ju Pei, Zhao Jianguo Oct 2021

Design And Application Of Pdc Bit For Large Diameter Directional Drilling Of Coal Seam Roof With Double Stage And Double Speed, Gao Xiaoliang, Ju Pei, Zhao Jianguo

Coal Geology & Exploration

The development of large diameter directional drilling technology has provided technical support for the extraction of gas in the upper corner of the goaf by "replacing roadway with borehole". At present, conventional large-diameter drilling mainly adopts the step-by-step hole-forming method, which solves the problem of insufficient power of large-diameter drilling equipment in underground coal mines. However, step-by-step reaming requires multiple times of lifting and lowering, long auxiliary time and intensive labor of the workers. In order to improve the drilling efficiency of large-diameter holes in the coal roof, a double stage drilling process with two speeds was developed. The process …

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Application And Development Of Advanced Drilling Technology For Coal Mine Roadway Heading, Zhang Youzhen, Fan Tao, Kan Zhitao, Wei Hongchao, Chen Hongyan Oct 2021

Application And Development Of Advanced Drilling Technology For Coal Mine Roadway Heading, Zhang Youzhen, Fan Tao, Kan Zhitao, Wei Hongchao, Chen Hongyan

Coal Geology & Exploration

With the development of intelligent and fast roadway heading in coal mines, the demand for advanced and fine exploration of heading face is becoming increasingly urgent. Considering the technical characteristics of roadway heading and tunnel drilling, this paper firstly analyzes the technical characteristics and technical requirements of roadway heading advanced drilling under the background of intelligent green mining of coal mines and describes the innovative practice of technology and equipment, such as the integration of excavation and exploration, dual-arm advanced drilling and comprehensive exploration based on directional drilling to effectively solve the contradiction of exploration and excavation and improve the …

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Remediation Techniques For Cadmium-Contaminated Dredged River Sediments After Land Disposal, Zhang Changsong Oct 2021

Remediation Techniques For Cadmium-Contaminated Dredged River Sediments After Land Disposal, Zhang Changsong

Coal Geology & Exploration

The remediation of heavy metal Cd contamination in municipal waste is one of the urgent environmental problems in China. To determine the best Cd pollution remediation technology, this paper investigates the applicability of various cadmium(Cd) remediation techniques in river treatment. These remediation methods are compared and analyzed based on the dredged river sediments after land disposal in a city in East China. Three remediation techniques of stabilization, soil leaching, and phytoremediation, are compared by analyzing the performance of the techniques for Cd-contaminated soil remediation. The experimental results show that the stabilization technique reduced the leaching rate of soil Cd from …

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Mgrre_Pureoilscouttickets_Robertson_1_21127021230000, Mgrre Oct 2021

Mgrre_Pureoilscouttickets_Robertson_1_21127021230000, Mgrre

Legacy Scout Tickets from Pure Oil Company

No abstract provided.

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Tracking Secondary Lahar Flow Paths And Characterizing Pulses And Surges Using Infrasound Array Networks At Volcán De Fuego, Guatemala, Ashley R. Bosa, Jeffrey B. Johnson, Silvio De Angelis, John J. Lyons, Amilcar Roca, Jacob F. Anderson, Amando Pineda Oct 2021

Tracking Secondary Lahar Flow Paths And Characterizing Pulses And Surges Using Infrasound Array Networks At Volcán De Fuego, Guatemala, Ashley R. Bosa, Jeffrey B. Johnson, Silvio De Angelis, John J. Lyons, Amilcar Roca, Jacob F. Anderson, Amando Pineda

Geosciences Faculty Publications and Presentations

Lahars are one of the greatest hazards at many volcanoes, including Volcán de Fuego (Guatemala). On 1 December 2018 at 8:00 pm local Guatemala time (~2:06:00 UTC), an hour-long lahar event was detected at Volcán de Fuego by two permanent seismo-acoustic stations along the Las Lajas drainage on the southeast side. To establish the timing, duration, and speed of the lahar, infrasound array records were examined to identify both the source direction(s) and the correlated energy fluctuations at the two stations. Co-located seismic and acoustic signals were also examined, which indicated at least five distinct energy pulses within the lahar …

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Automated Identification Of Stages In Gonotrophic Cycle Of Mosquitoes Using Computer Vision Techniques, Sherzod Kariev Oct 2021

Automated Identification Of Stages In Gonotrophic Cycle Of Mosquitoes Using Computer Vision Techniques, Sherzod Kariev

USF Tampa Graduate Theses and Dissertations

In this paper, we design Computer Vision techniques to determine stages in the Gonotrophic cycle of mosquitoes. The dataset for our problem came from 125 adult female mosquitoes - each of which belonged to one of three species - Aedes aegypti, Culex quinquefasciatus, and Anopheles stephensi. The mosquitoes were raised in a lab and passed through all fourGonotrophic stages (Un-fed, Fully-fed, Semi-gravid, and Gravid). At each stage, their images were captured on a plain background via a Xiaomi smartphone, resulting in a dataset of 1784 images. The images were then augmented using standard techniques to generate a larger dataset of …

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Comments On The Holographic Description Of Narain Theories, Anatoly Dymarsky, Alfred D. Shapere Oct 2021

Comments On The Holographic Description Of Narain Theories, Anatoly Dymarsky, Alfred D. Shapere

Physics and Astronomy Faculty Publications

We discuss the holographic description of Narain U(1)c × U(1)c conformal field theories, and their potential similarity to conventional weakly coupled gravitational theories in the bulk, in the sense that the effective IR bulk description includes “U(1) gravity” amended with additional light degrees of freedom. Starting from this picture, we formulate the hypothesis that in the large central charge limit the density of states of any Narain theory is bounded by below by the density of states of U(1) gravity. This immediately implies that the maximal value of the spectral gap for primary fields is ∆1 = …

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Application Of Surface Nuclear Magnetic Resonance Technology In Detecting Water Abundance In Concealed Burnt Zone, Hou Enke, Fan Jiangwei, Gao Lijun, Wang Jianwen, Chen Dehai, Chi Baosuo, Wang Hongke Oct 2021

Application Of Surface Nuclear Magnetic Resonance Technology In Detecting Water Abundance In Concealed Burnt Zone, Hou Enke, Fan Jiangwei, Gao Lijun, Wang Jianwen, Chen Dehai, Chi Baosuo, Wang Hongke

Coal Geology & Exploration

The overlying bedrock composite aquifer(including weathered bedrock and burnt rock aquifer) in the concealed burnt zone of coal seams is one of the main threats to coal mining. It is of great significance to clarify the water enrichment of the concealed burnt zone for the prevention and control of coal mine water hazards. Ningtiaota Coal Mine, which has experienced a large water inrush accident, was used as the research object, and the Surface Nuclear Magnetic Resonance(SNMR) was used to detect the water enrichment of the aquifer in the concealed burnt area. The results show that there are two aquifers in …

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Beware Of Ips In Sheep's Clothing: Measurement And Disclosure Of Ip Spoofing Vulnerabilities, Alden Douglas Hilton Oct 2021

Beware Of Ips In Sheep's Clothing: Measurement And Disclosure Of Ip Spoofing Vulnerabilities, Alden Douglas Hilton

Theses and Dissertations

Networks not employing destination-side source address validation (DSAV) expose themselves to a class of pernicious attacks which could be prevented by filtering inbound traffic purporting to originate from within the network. In this work, we survey the pervasiveness of networks vulnerable to infiltration using spoofed addresses internal to the network. We issue recursive Domain Name System (DNS) queries to a large set of known DNS servers world-wide using various spoofed-source addresses. In late 2019, we found that 49% of the autonomous systems we tested lacked DSAV. After a large-scale notification campaign run in late 2020, we repeated our measurements in …

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