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Articles 70141 - 70170 of 302576

Full-Text Articles in Physical Sciences and Mathematics

Rare Earth Element Contents, Geochemistry Of Soil Samples Between Burdur And Isparta Region And Assessment Of Their Origin, Ebru Tat, Mustafa Gürhan Yalçin Aug 2020

Rare Earth Element Contents, Geochemistry Of Soil Samples Between Burdur And Isparta Region And Assessment Of Their Origin, Ebru Tat, Mustafa Gürhan Yalçin

Bulletin of the Mineral Research and Exploration

This study was carried out in 5 locations between Burdur and Isparta in the inner southern part of Isparta Bend. The study aims to determine the rare earth element (REE) concentrations in the soil samples collected from the field and to interpret the origin of the high concentrations detected. In this context, a total of 104 samples were collected from Canakli Village (19 samples), Cobanisa Village (34 samples), Kuyubasi Village (17 samples), Kuzca Village (17 samples), and Yilanli Village (17 samples) in the study field. The average ∑REE (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, …

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Diagrams Of ⋆-Trisections, José Román Aranda, Jesse Moeller Aug 2020

Diagrams Of ⋆-Trisections, José Román Aranda, Jesse Moeller

Department of Mathematics: Faculty Publications

In this note we provide a generalization for the definition of a trisection of a 4-manifold with boundary. We demonstrate the utility of this more general definition by finding a trisection diagram for the Cacime Surface, and also by finding a trisection-theoretic way to perform logarithmic surgery. In addition, we describe how to perform 1-surgery on closed trisections. The insight gained from this description leads us to the classification of an infinite family of genus three trisections. We include an appendix where we extend two classic results for relative trisections for the case when the trisection surface is closed.

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Variations In The Southern Hemisphere Westerlies Over The Last 23,000 Years From Lake Records In The Falkland Islands, Meghan M. Spoth Aug 2020

Variations In The Southern Hemisphere Westerlies Over The Last 23,000 Years From Lake Records In The Falkland Islands, Meghan M. Spoth

Electronic Theses and Dissertations

The Southern Hemisphere Westerlies (SHW) are an important driver of climate in the mid-latitudes of the Southern Hemisphere. Abrupt latitudinal migration of this coupled atmospheric-oceanic system is thought to be linked to the onset of the Termination at the end of the last ice age and to subsequent climatic variation through the late-glacial period and Holocene. However, the timing and spatial extent of these shifts, as well as variations in wind intensity, are poorly constrained, hindering our understanding of abrupt climate change in the Southern Hemisphere. In addition, future changes in the position and intensity of the SHW are a …

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A First Look At Forensic Analysis Of Sailfishos, Krassimir Tzvetanov, Umit Karabiyik Aug 2020

A First Look At Forensic Analysis Of Sailfishos, Krassimir Tzvetanov, Umit Karabiyik

Faculty Publications

SailfishOS is a Linux kernel-based embedded device operation system, mostly deployed on cell phones. Currently, there is no sufficient research in this space, and at the same time, this operating system is gaining popularity, so it is likely for investigators to encounter it in the field. This paper focuses on mapping the digital artifacts pertinent to an investigation, which can be found on the filesystem of a phone running SailfishOS 3.2. Currently, there is no other known publicly available research and no commercially available solutions for the acquisition and analysis of this platform. This is a major gap, as the …

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Biophysical And Stable Isotopic Profiles Of The Salmon Louse Lepeophtheirus Salmonis (Krøyer, 1837), Emma Taccardi Aug 2020

Biophysical And Stable Isotopic Profiles Of The Salmon Louse Lepeophtheirus Salmonis (Krøyer, 1837), Emma Taccardi

Electronic Theses and Dissertations

The salmon louse Lepeophtheirus salmonis is a parasitic copepod that infects wild and farmed salmonids throughout the northern hemisphere. L. salmonis represents the largest economic hurdle of the Atlantic salmon (Salmo salar) industry, with an estimated annual cost of nearly $1 billion globally due to production losses and anti-parasitic control measures. Salmon farming in Maine has existed for decades and is a critical economic driver, yet the region is underrepresented in global sea lice research. The aim of this work was to examine parasites in the context of animal trophic transfer and characterize physiological condition by quantifying the …

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Bicknell's Thrush Habitat Use On Commercial Forests In Maine, Usa, Kaitlyn Wilson Aug 2020

Bicknell's Thrush Habitat Use On Commercial Forests In Maine, Usa, Kaitlyn Wilson

Electronic Theses and Dissertations

Forest reliant species may be significantly impacted by forest management practices. Understanding these impacts, and whether they are positive or negative, requires a species- specific understanding of habitat use. Bicknell’s thrush (Catharus bicknelli) is a range-restricted habitat specialist occurring in balsam fir (Abies balsamea) dominated montane forests that have been recently disturbed and are undergoing successional growth. While research investigating this species’ habitat use has been conducted throughout much of its breeding range, knowledge of Bicknell’s thrush habitat use in Maine is lacking. Greater understanding of habitat use in Maine would improve the ability of forest managers to promote conservation …

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Investigations On The Helix-Coil Transition Inside Nanotubes, Dylan Suvlu Aug 2020

Investigations On The Helix-Coil Transition Inside Nanotubes, Dylan Suvlu

Electronic Theses and Dissertations

Proteins are the workhorses of biology and are essential to life as we know it. A protein’s function in the cell is intimately related to its three-dimensional structure. Thus, understanding structure formation in proteins has been an essential goal in molecular biology. Experiments indicate proteins start acquiring structure inside the ribosome—the cellular manufacturing plant of proteins—and the process is particularly important for membrane proteins. Therefore, the ribosome appears to play an active role in facilitating protein structure acquisition. However, how and when the ribosome accomplishes this task remains poorly understood. To better understand this process, we conducted molecular dynamics computer …

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Long Term Air Quality Analysis In Reference To Thermal Power Plants Using Satellite Data In Singrauli Region, India, H. K. Romana, Ramesh P. Singh, D. P. Shukla Aug 2020

Long Term Air Quality Analysis In Reference To Thermal Power Plants Using Satellite Data In Singrauli Region, India, H. K. Romana, Ramesh P. Singh, D. P. Shukla

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

The exponentially growing population and related anthropogenic activities have led to modifications in local environment. The change in local environment, evolving pattern of land use, concentrations of greenhouse gases and aerosols alter the energy balance of our climate system. This alteration in climate is leading to pre-mature deaths worldwide. This study analyses the air quality of Singrauli region, Madhya Pradesh, India for the past 15 years. Otherwise known as Urjanchal “the energy capital” of India has been declared as critically polluted by CPCB. The study provides an updated list of thermal power plants in the study area and their emission …

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Proposing A Sustainable Future For The Muskoka Region, Andrew Court '22 Aug 2020

Proposing A Sustainable Future For The Muskoka Region, Andrew Court '22

Student Scholarship

The following report is from a summer research project conducted between May and August 2020 that was supported by Hamilton College’s Emerson Collaborative Grants. The project’s ultimate goal is to collect empirical survey data combined with expert interviews to propose pathways to a sustainable future for the Muskoka Region. The Muskoka Region is a gorgeous and unique area in Northern Canada that requires and deserves environmental stability and preservation. Over the past few years, Muskoka's environment has been increasingly degraded, and the causes and motivations of this degradation merit attention. This project consists of 3 reports, and aims to improve …

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Clayoquot Sound Harmful Algal Blooms Investigation Of Herbert Inlet – 2019, Claire Byers Aug 2020

Clayoquot Sound Harmful Algal Blooms Investigation Of Herbert Inlet – 2019, Claire Byers

Environmental Science Undergraduate Theses

Clayoquot Sound of British Columbia, Canada is a protected biosphere that has been affected by Alexandrium, a known toxic dinoflagellate, that when consumed by humans can cause paralytic shellfish poisoning. The “BLOB” events that heated the water in the Pacific Ocean in 2014 and 2019 created favorable conditions for these algae to flourish in this region. This study focused on analyzing and comparing nitrate, phosphate, and silicate levels, oceanic conditions, and water properties like temperature, salinity, density, dissolved oxygen, fluorescence, and transmissivity for Herbert Inlet in 2014 and 2019. Surface and bottom samples were collected and sent to the University …

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Clayoquot Sound Harmful Algal Blooms Investigation Of Sydney Inlet – 2019, Alyssa Anderbery Aug 2020

Clayoquot Sound Harmful Algal Blooms Investigation Of Sydney Inlet – 2019, Alyssa Anderbery

Environmental Science Undergraduate Theses

In 2014 and 2019, an unusually warm patch of water in the North Pacific called the ‘Blob’, came ashore in early Fall of both years. Researchers were interested to see if this warm water intruded into Sydney Inlet of Clayoquot Sound, which is located off the west coast of Vancouver Island an important source of food and income for the neighboring communities. If these warm waters intruded into the Sound, this could in-turn create favorable conditions for harmful algal blooms (HABs) to form, specifically the phytoplankton Alexandrium known to be present in this region. As a result, University of Washington …

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Understanding The Magnetic Properties Of Ii-Vi Semiconductor Nanocrystals, Alex Khammang Aug 2020

Understanding The Magnetic Properties Of Ii-Vi Semiconductor Nanocrystals, Alex Khammang

Electronic Theses and Dissertations

Semiconductor nanocrystals (NC) are well known for their unique size tunable optical properties making them suitable candidates for devices such as light emitting diodes (LEDs), solar cells, and cellular labels. II-VI semiconductors in the bulk form behave diamagnetically, but can inherit paramagnetic (PM) or ferromagnetic (FM) properties at the nanoscale. Reports suggest that the emergence of weak PM or FM behavior in undoped NCs are attributed to the increased surface to volume ratio compared for NCs. Traditionally, these NCs only obtain magnetic properties after doping with certain transition metals, such as Co, Mn, or Fe. Many mechanisms have been proposed …

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Sulfur And Trace Metal Cycling At Convergent Margins, Jesse B. Walters Aug 2020

Sulfur And Trace Metal Cycling At Convergent Margins, Jesse B. Walters

Electronic Theses and Dissertations

Subduction zones are the site of long-term chemical exchange between Earth’s surface and interior geochemical reservoirs. Subducting slabs are progressively depleted in volatiles and other mobile elements through dehydration and melting reactions. These elements are then introduced to the mantle wedge and volcanic arc. One consequence of this cycle is that volcanic arcs produce the most oxidized magmas on Earth. Sulfur, which exhibits a range in valence states from S2- to S6+, is one of the few elements in the subducting slab capable of oxidizing the arc and mantle wedge. Sulfides in the slab may also act …

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Induced Ferroelectric Phases In Srtio3 By A Nanocomposite Approach, Erik Enriquez, Qian Li, Pamela Bowlan, Ping Lu, Bruce Zhang, Leigang Li, Haiyan Wang, Antoinette J. Taylor, Dmitry Yarotski, Rohit P. Prasankumar Aug 2020

Induced Ferroelectric Phases In Srtio3 By A Nanocomposite Approach, Erik Enriquez, Qian Li, Pamela Bowlan, Ping Lu, Bruce Zhang, Leigang Li, Haiyan Wang, Antoinette J. Taylor, Dmitry Yarotski, Rohit P. Prasankumar

Physics and Astronomy Faculty Publications and Presentations

Inducing new phases in thick films via vertical lattice strain is one of the critical advantages of vertically aligned nanocomposites (VANs). In SrTiO3 (STO), the ground state is ferroelastic, and the ferroelectricity in STO is suppressed by the orthorhombic transition. Here, we explore whether vertical lattice strain in three-dimensional VANs can be used to induce new ferroelectric phases in SrTiO3:MgO (STO:MgO) VAN thin films. The STO:MgO system incorporates ordered, vertically aligned MgO nanopillars into a STO film matrix. Strong lattice coupling between STO and MgO imposes a large lattice strain in the STO film. We have investigated ferroelectricity in the …

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Distribution, Geochronology, And Petrogenesis Of The Picture Gorge Basalt With Special Focus On Petrological Relationships To The Main Columbia River Basalt Group, Emily Bogdan Cahoon Aug 2020

Distribution, Geochronology, And Petrogenesis Of The Picture Gorge Basalt With Special Focus On Petrological Relationships To The Main Columbia River Basalt Group, Emily Bogdan Cahoon

Dissertations and Theses

The Columbia River Basalt Group (CRBG) is the youngest and volumetrically smallest continental flood basalt exposed across the Pacific Northwest, USA. Similar to other large igneous provinces, the majority of material erupted during the initial 1 million years of activity, these lavas are subdivided into four main-phase units. The Picture Gorge Basalt (PGB) is the only main-phase unit of the CRBG whose age is not precisely known and understanding of PGB petrogenesis is largely based on a limited number of samples when compared with other main-phase units. It is suggested that a time gap of over 0.5 myr existed between …

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Effect Of Liming And Mineral Fertilisation On Soil Properties And Long‐Term Sward Agrocoenosis Productivity, Ruta Butkute Aug 2020

Effect Of Liming And Mineral Fertilisation On Soil Properties And Long‐Term Sward Agrocoenosis Productivity, Ruta Butkute

IGC Proceedings (1993-2023)

No abstract provided.

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Effect Of Nitrogen Fertilization And Cutting Management On The Chemical Composition Of Panicum Maximum Jacq In West Cameroon, B. Boukila, E. Tedonkeng Pamo, F. Tendonkeng, C. N. Meduke Aug 2020

Effect Of Nitrogen Fertilization And Cutting Management On The Chemical Composition Of Panicum Maximum Jacq In West Cameroon, B. Boukila, E. Tedonkeng Pamo, F. Tendonkeng, C. N. Meduke

IGC Proceedings (1993-2023)

No abstract provided.

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Critical Plant And Leaf N Concentrations Of An Ageing Timothy Sward, Gilles Bélanger, Gaëtan F. Tremblay Aug 2020

Critical Plant And Leaf N Concentrations Of An Ageing Timothy Sward, Gilles Bélanger, Gaëtan F. Tremblay

IGC Proceedings (1993-2023)

No abstract provided.

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A Two-Stage Model For Social Network Investigations In Digital Forensics, Anne David, Sarah Morris, Gareth Appleby-Thomas Aug 2020

A Two-Stage Model For Social Network Investigations In Digital Forensics, Anne David, Sarah Morris, Gareth Appleby-Thomas

Journal of Digital Forensics, Security and Law

This paper proposes a two-stage model for identifying and contextualizing features from artefacts created as a result of social networking activity. This technique can be useful in digital investigations and is based on understanding and the deconstruction of the processes that take place prior to, during and after user activity; this includes corroborating artefacts. Digital Investigations are becoming more complex due to factors such as, the volume of data to be examined; different data formats; a wide range of sources for digital evidence; the volatility of data and the limitations of some of the standard digital forensic tools. This paper …

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Revision And Thinking About Agent-Based Modeling Research To Group Violent Activity, Chen Peng, Jianguo Chen, Hongyong Yuan Aug 2020

Revision And Thinking About Agent-Based Modeling Research To Group Violent Activity, Chen Peng, Jianguo Chen, Hongyong Yuan

Journal of System Simulation

Abstract: The current work about Agent-based modeling research on group violent incidents was reviewed, which included the social science theory which undertakes the group violence simulation, the studies about Agent categorization, relationship modeling, Agent emotion production, adaptive decision-making process and evolution of complex behaviors. It was indicated that the constructing of Agent model experienced the process in which the Agent model transited from simplicity to more complexity, thus, focusing on individuality and heterogeneity's model construction which was integrated more on sociology and psychology would become a significant development trend. Following that, some suggestions and thinking which included the principle of …

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Research Progress On Virtual Pruning Fruit Trees, Mengmeng Lü, Shenglian Lu, Xinyu Guo Aug 2020

Research Progress On Virtual Pruning Fruit Trees, Mengmeng Lü, Shenglian Lu, Xinyu Guo

Journal of System Simulation

Abstract: The tree structure has a strong influence on fruit yield and quality, and pruning is one of the most important management measures of tree shapes with high yield and good quality. Pruning test or technology demonstration in real fruit trees are irreversible defects, high cost, and difficult to fast rendering of pruning. Virtual pruning of fruit trees, which is in this context with rapid progress of virtual reality technology has developed rapidly and becomes the hot research topic. The aim is to create a space of virtual and simulate fruit tree pruning and the influence of pruning, so as …

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Simulation-Enable Method Based On Architecture, Qiurui Chen, Xinping Xiong, Duzheng Qing, Zhang Jin Aug 2020

Simulation-Enable Method Based On Architecture, Qiurui Chen, Xinping Xiong, Duzheng Qing, Zhang Jin

Journal of System Simulation

Abstract: Requirements of architect simulation-enable were analyzed which conducted the study of the completeness condition for architect execution and architecture description framework was extended. An executable architecture framework satisfied the completeness condition and its development process was proposed, and upon which simulation-enable method based on executable architecture framework was put forward. The theory of mapping and conversion from architecture products to input of simulation platform was introduced. The method provided an available approach to raise the simulation model development efficiency and keep the consistency of the high level design with simulation system. A water distribution system was taken as an …

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Simulation Analysis On Radial Diffusion Model For Solidification Process Of Carbon Fiber Production, Lihong Ren, Xu Feng, Yongsheng Ding, Zhang Tao Aug 2020

Simulation Analysis On Radial Diffusion Model For Solidification Process Of Carbon Fiber Production, Lihong Ren, Xu Feng, Yongsheng Ding, Zhang Tao

Journal of System Simulation

Abstract: Considering that Polyacrylonitrile Dimethyl Sulfoxide solution and Dimethyl Sulfoxide aqueous solution were used as the spinning dope and coagulating liquid respectively, the solidification process in spinning system of carbon fiber was studied. The radial concentration distribution and the curve of time-dependence concentration were proposed. The influence of the spinning conditions on the solidification process was investigated by changing the parameters of the model. The results show that extending the coagulation time by using coarser article spinning or increasing the solid content in dope can help to obtain the fiber with uniform structure and densification. The proposed method has good …

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Combat Crowd Behavior Modeling Based On Multilayered Decision-Making, Xue Qing, Wenchao Xu, Changwei Zheng, Guohui Zhang Aug 2020

Combat Crowd Behavior Modeling Based On Multilayered Decision-Making, Xue Qing, Wenchao Xu, Changwei Zheng, Guohui Zhang

Journal of System Simulation

Abstract: Training simulator is one important part of the virtual solider technology application, and the combat crowd behavior research can improve training effect efficiently. The model divided the combat decision-making into five layers: biomechanical, reactive, cognitive, and rational, and constructed combat crowd behavior model; proposed the concept of interaction unit that can save and perform the interaction between agents. The multilayered decision-making system used an oriented graph managed the behavior planning and built the interaction management. The model divided the combat behavior into seven basic behavior in order to simplify the combat goal. The model was used in an equipment …

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Simulation Study On Effect Of Mechanical Environmental Load On Electro-Mechanical Actuator Under Working Condition, Xuerong Ye, Yingqi Wang, Zixian Li, Ansheng Liang Aug 2020

Simulation Study On Effect Of Mechanical Environmental Load On Electro-Mechanical Actuator Under Working Condition, Xuerong Ye, Yingqi Wang, Zixian Li, Ansheng Liang

Journal of System Simulation

Abstract: Electro-mechanical actuator (EMA) is a key part for helicopter to realize the accurate guidance. Random vibration and impact can affect its working performance directly. Based on multi-software co-simulation, a new method for analyzing the influence of mechanical environment on the working performance of EMA was proposed. The model of EMA was built by UG, and then mechanical property of the EMA interconnecting pieces under work condition was analyzed by ADAMS. After that, Patran and Nastran were used to study the dynamics features including random vibration and impact performance, so as to get influence of mechanical load on the structure …

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Target Association Algorithm And Simulation For Radar And Ais Based On Bp Network, Xiaolong Zhang, Jiachun Zheng, Changchuan Lin, Xiaorui Hu, Qiaoping Chen, Shuangshuang Zhu Aug 2020

Target Association Algorithm And Simulation For Radar And Ais Based On Bp Network, Xiaolong Zhang, Jiachun Zheng, Changchuan Lin, Xiaorui Hu, Qiaoping Chen, Shuangshuang Zhu

Journal of System Simulation

Abstract: Radar and AIS (Automatic Identification System) are two kinds of important equipment to obtain targets information in marine traffic, but the content and accuracy of both information are different, which can complement for each other in a certain sense. To hand more reliable and precise of the targets information, information fusion is necessary, and targets association decision is the indispensable stage in the whole process. According to multi-sensor information fusion theory and principle of BP neural network, a targets association algorithm of radar and AIS based on BP network was proposed, after the discussion of net structure design, simulation …

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Study On Performance Of Pure Electric Vehicles Nder Single Energy Source And Dual-Energy Source Based On Bench Test, Shaojian Song, Qingfang Lin, Xiaofeng Lin Aug 2020

Study On Performance Of Pure Electric Vehicles Nder Single Energy Source And Dual-Energy Source Based On Bench Test, Shaojian Song, Qingfang Lin, Xiaofeng Lin

Journal of System Simulation

Abstract: With most of the study on performance of the pure electrical vehicles under single energy source and dual-energy source based on virtual vehicle simulation software, such as ADVISOR, PSAT, the mechanical properties of the real vehicle system, the physical properties of the battery pack, the conversion efficiency of the bi-directional DC/DC converter and the response time of the energy management system were ignored, which could not reflect the real vehicle systems accurately. Taking the pure electric vehicle test system as the research object, in which the LiFePO4 battery pack was the main energy source and the ultra-capacitor was …

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Gait Planning And Control Of Quadruped Robot With High Payload, Hu Nan, Shaoyuan Li, Huang Dan, Gao Feng Aug 2020

Gait Planning And Control Of Quadruped Robot With High Payload, Hu Nan, Shaoyuan Li, Huang Dan, Gao Feng

Journal of System Simulation

Abstract: A position controller for a quadruped robot with high payload was proposed. The robot was developed by the lab, and the high payload capacity was realized by the specific design of its actuation system, integrating novel high precision actuators, and by its legs, composed by a new family of parallel mechanisms. The foot trajectory was scheduled based on the Bezier curve in order to improve the stability of quadruped robot. The performance and efficiency of the proposed methods were verified by simulation and experiments.

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Dynamic Offense And Defense Conversion Strategy Of Robot Soccer Based On Ant Colony System, Xianlun Tang, Jialin Zhou, Lamei Li, Zhang Yi Aug 2020

Dynamic Offense And Defense Conversion Strategy Of Robot Soccer Based On Ant Colony System, Xianlun Tang, Jialin Zhou, Lamei Li, Zhang Yi

Journal of System Simulation

Abstract: In order to improve the offense and defense capability of robot soccer, a dynamic offense and defense conversion strategy of robot soccer based on hybrid communication mechanism of ant colony system was proposed. The mechanism enhanced robots' collaboration capabilities and avoided the conflict or task deadlock. The strategy divided the region and established the formation according to the sub-regional pheromone, and the position of the ball was regarded as the drive information. Experimental results in FIRA simulation platform show that the dynamic offense and defense conversion strategy have better performance and improve the global offense and defense capability, so …

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Fault Diagnosis For Automobile Coating Equipments Based On Extension Neural Network, Yongwei Ye, Shedong Ren, Lianqiang Ye, Shenhao Ge, Zhiqin Qian Aug 2020

Fault Diagnosis For Automobile Coating Equipments Based On Extension Neural Network, Yongwei Ye, Shedong Ren, Lianqiang Ye, Shenhao Ge, Zhiqin Qian

Journal of System Simulation

Abstract: Aiming at the difficulty in discovering and eliminating the system faults of automobile coating equipments in time, a new method of fault diagnosis based on extension neural network was proposed. The feature of extension theory was used in managing the structured information through qualitative and quantitative description, and it was also combined by the characteristic of parallel construct in neural network. So the extension reasoning process was completed by means of the parallel distributed processing construct of the network. Matter-element input and output models were established according to the equipment monitoring parameters and fault types for the heating system. …

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