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Articles 69151 - 69180 of 302419

Full-Text Articles in Physical Sciences and Mathematics

Mathematical Modeling Of Nonlinear Problem Biological Population In Not Divergent Form With Absorption, And Variable Density, Maftuha Sayfullayeva Sep 2020

Mathematical Modeling Of Nonlinear Problem Biological Population In Not Divergent Form With Absorption, And Variable Density, Maftuha Sayfullayeva

Acta of Turin Polytechnic University in Tashkent

В работе установлены критические и двойные критические случаи, обусловленные представлением двойного нелинейного параболического уравнения с переменной плотностью с поглощением в "радиально-симметричной" форме.Такое представление исходного уравнения дало возможность легко построить решения типа Зельдовоч-Баренбатт-Паттл для критических случаев в виде функций сравнения.

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Effect Of Grazing Intensity On Photosynthesis And Soil Respiration Of Alpine Grassland In Tibet, Y. F. Wan, Q. Z. Gao, Y. Li, X. B. Qin, W. Z. Jiancun, B. S. Wang Sep 2020

Effect Of Grazing Intensity On Photosynthesis And Soil Respiration Of Alpine Grassland In Tibet, Y. F. Wan, Q. Z. Gao, Y. Li, X. B. Qin, W. Z. Jiancun, B. S. Wang

IGC Proceedings (1993-2023)

No abstract provided.

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Relationship Between Different Grassland Types And Their Volatile Patterns To Enhance The Traceability Of Italian Typical Alpine Dairy Products, P. Aceto, S. Belviso, A. Cavallero, L. Falchero, A. Fossi, M. Giordano, R. Paoletti, Efisio Piano, A. Tava, G. Zeppa Sep 2020

Relationship Between Different Grassland Types And Their Volatile Patterns To Enhance The Traceability Of Italian Typical Alpine Dairy Products, P. Aceto, S. Belviso, A. Cavallero, L. Falchero, A. Fossi, M. Giordano, R. Paoletti, Efisio Piano, A. Tava, G. Zeppa

IGC Proceedings (1993-2023)

No abstract provided.

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Long-Time Effects Of Grazing On Patagonian Rangelands (Argentina), Gabriel E. Oliva, G. Humano, D. Ferrante Sep 2020

Long-Time Effects Of Grazing On Patagonian Rangelands (Argentina), Gabriel E. Oliva, G. Humano, D. Ferrante

IGC Proceedings (1993-2023)

No abstract provided.

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Isomorphism Of Trees And Isometry Of Ultrametric Spaces, Oleksiy Dovgoshey Sep 2020

Isomorphism Of Trees And Isometry Of Ultrametric Spaces, Oleksiy Dovgoshey

Theory and Applications of Graphs

We study the conditions under which the isometry of spaces with metrics generated by weights given on the edges of finite trees is equivalent to the isomorphism of these trees. Similar questions are studied for ultrametric spaces generated by labelings given on the vertices of trees. The obtained results generalized some facts previously known for phylogenetic trees and for Gurvich---Vyalyi monotone trees.

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Hybrid Density Functionals With Proper Exact Exchange, Liyuan Ye Sep 2020

Hybrid Density Functionals With Proper Exact Exchange, Liyuan Ye

Electronic Thesis and Dissertation Repository

Hybrid density functionals have the best overall performance among standard density func-tional approximations (DFA). According to their original design, hybrid DFAs are supposedto use the exact exchange (EXX). However, when hybrid functionals were originally intro-duced, there was no simple method to compute EXX, so all of their practical implementationsstarted using the Hartree–Fock exchange (HFX), which can be computed easily and is simi-lar to but distinct from EXX. Recent development of an efficient method for computing EXXmade it possible to implement hybrid functionals in line with their original definition. Weimplemented EXX in the PBE0 functional and compared its performance with that …

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Conductivity Reversal In Silicon Doped With S And Zn, Abdulaziz Shavkatovich Mavlyanov, Nurullo Zikrillayev, Maruf Khaqqulov, Erkin Khaltursunov, Farhod Shakarov Sep 2020

Conductivity Reversal In Silicon Doped With S And Zn, Abdulaziz Shavkatovich Mavlyanov, Nurullo Zikrillayev, Maruf Khaqqulov, Erkin Khaltursunov, Farhod Shakarov

Acta of Turin Polytechnic University in Tashkent

Based on experimental results of investigation of type of conductivity of silicon samples doped with sulfur at Т=1250°С, and thereafter with zinc at T=1200°С, the authors put forward the hypothesis about self-assembly of “binary” elementary cells where atoms of elements of group II (Zn) and IV (S) allegedly form ZnS-type compounds in Si. The thermodynamic conditions required for buildup of such elementary cells and assembly of various associations in the basic lattice of silicon including self-assembly of ZnS clusters were theoretically determined and experimentally justified.

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Xinjiang Grasslands Ecological Conservation And Herdsman Increase Investigation And Discussion Collecting A Countermeasure, Xuanzheng Guo, Zhiguo Dong, Li Li Sep 2020

Xinjiang Grasslands Ecological Conservation And Herdsman Increase Investigation And Discussion Collecting A Countermeasure, Xuanzheng Guo, Zhiguo Dong, Li Li

IGC Proceedings (1993-2023)

No abstract provided.

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Evaluation Of Grassland Resources In Etuoke Front Banner, Ying De, Tegen Ao, Burenjiya Sep 2020

Evaluation Of Grassland Resources In Etuoke Front Banner, Ying De, Tegen Ao, Burenjiya

IGC Proceedings (1993-2023)

No abstract provided.

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Natural Resource Management: Building The Case For Civic Participation In Managing The Environment, Karen Cosgrove Sep 2020

Natural Resource Management: Building The Case For Civic Participation In Managing The Environment, Karen Cosgrove

IGC Proceedings (1993-2023)

No abstract provided.

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Cymbopogon Nardus, A Grass Weed In The Rangelands Of Uganda: Impact On Plant Species Biodiversity And Livestock Performance, S. G. Byenkya, C. Ebong, C. Sudhe, J. Kigongo Sep 2020

Cymbopogon Nardus, A Grass Weed In The Rangelands Of Uganda: Impact On Plant Species Biodiversity And Livestock Performance, S. G. Byenkya, C. Ebong, C. Sudhe, J. Kigongo

IGC Proceedings (1993-2023)

No abstract provided.

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Rare Earth-Bearing Particles In Fly Ash Carbons: Examples From The Combustion Of Eastern Kentucky Coals, James C. Hower, John G. Groppo Jr. Sep 2020

Rare Earth-Bearing Particles In Fly Ash Carbons: Examples From The Combustion Of Eastern Kentucky Coals, James C. Hower, John G. Groppo Jr.

Center for Applied Energy Research Faculty and Staff Publications

Graphitic carbons from the combustion of bituminous coals and, perhaps, other coal ranks, tend to capture iron and a number of hazardous elements, including As, Hg, and Se. Rare earth elements in fly ashes occur in minerals, such as monazite, xenotime, and davidite. They also occur in sub-nm particles, probably in a mineral form, within the Al–Si glass on the investigated fly ashes. Just as graphitic carbons can capture Fe and hazardous elements, the carbons surrounding the fly ash glass and magnetic particles captures or encapsulates a broad suite of rare earth elements.

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Detecting Symptoms Of Chronic Obstructive Pulmonary Disease And Congestive Heart Failure Via Cough And Wheezing Sounds Using Smart-Phones And Machine Learning, Anthony Windmon Sep 2020

Detecting Symptoms Of Chronic Obstructive Pulmonary Disease And Congestive Heart Failure Via Cough And Wheezing Sounds Using Smart-Phones And Machine Learning, Anthony Windmon

USF Tampa Graduate Theses and Dissertations

Chronic Obstructive Pulmonary Disease (COPD) and Congestive Heart Failure (CHF) are progressive disorders, and major health concerns among today’s aging population. COPD causes a large mucus buildup in the lungs, leading to chronic cough and difficulty to breathe. CHF causes fluid buildup in the lower lungs due to the failing heart, causing cough and difficulty to breath. People who are clinically diagnosed with COPD or CHF are expected to regularly monitor their symptoms and follow complex medical recommendations in an effort to prevent exacerbation. In this dissertation, we elaborate upon three different machine learning based techniques that we developed for …

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Aqueous Kinetics Of Α-Hydroxyhippuric Acid Derivatives Bearing Electron-Withdrawing Groups As A Function Of Ph And Buffer Catalysts, Mohamad Imad Rafie Sep 2020

Aqueous Kinetics Of Α-Hydroxyhippuric Acid Derivatives Bearing Electron-Withdrawing Groups As A Function Of Ph And Buffer Catalysts, Mohamad Imad Rafie

Theses and Dissertations

It has been shown that carbinolamides are intermediates in the enzyme-catalyzed synthesis of -amidated peptides. Although carbinolamides are important intermediates in the production of these hormones and have roles in other biological venues, little attention has been given to their mechanisms of reaction in water, and, thus, it is difficult to speculate how their reaction would be enzymatically catalyzed. The purpose of the work presented here was to synthesize structural analogs of the biological intermediates and study their mechanism of breakdown in water. -Hydroxyhippuric acid, a substrate for the enzymatic system, provides an easily modified template for the study of …

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Do Fungal Symbionts Of Salt Marsh Plants Affect Interspecies Competition?, Vanessa Robertson-Rojas Sep 2020

Do Fungal Symbionts Of Salt Marsh Plants Affect Interspecies Competition?, Vanessa Robertson-Rojas

Dissertations and Theses

The effects of arbuscular mycorrhizal fungi (AMF) as salt marsh plant symbionts may have significant effects on landscape scale distribution patterns and plant-related ecosystem functions that are important to estuarine habitats. This work investigates the effects AMF have on Phalaris arundinacea, Deschampsia cespitosa, and Juncus balticus when grown in a common garden experiment. Plants were grown with and without AMF inoculation in both polyculture and monoculture communities and examined for a variety of response variables that represent different competition strategies. Factorial ANOVA analysis revealed a significant three-way interaction among fungal treatment type, community type, and species for …

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Chess As A Testing Grounds For The Oracle Approach To Ai Safety, James D. Miller, Roman Yampolskiy, Olle Häggström, Stuart Armstrong Sep 2020

Chess As A Testing Grounds For The Oracle Approach To Ai Safety, James D. Miller, Roman Yampolskiy, Olle Häggström, Stuart Armstrong

Faculty and Staff Scholarship

To reduce the danger of powerful super-intelligent AIs, we might make the first such AIs oracles that can only send and receive messages. This paper proposes a possibly practical means of using machine learning to create two classes of narrow AI oracles that would provide chess advice: those aligned with the player's interest, and those that want the player to lose and give deceptively bad advice. The player would be uncertain which type of oracle it was interacting with. As the oracles would be vastly more intelligent than the player in the domain of chess, experience with these oracles might …

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Contrasting Cumulative Risk And Multiple Individual Risk Models Of The Relationship Between Adverse Childhood Experiences (Aces) And Adult Health Outcomes, Marianna Lanoue, Brandon George, Deborah L Helitzer, Scott W Keith Sep 2020

Contrasting Cumulative Risk And Multiple Individual Risk Models Of The Relationship Between Adverse Childhood Experiences (Aces) And Adult Health Outcomes, Marianna Lanoue, Brandon George, Deborah L Helitzer, Scott W Keith

College of Population Health Faculty Papers

BACKGROUND: A very large body of research documents relationships between self-reported Adverse Childhood Experiences (srACEs) and adult health outcomes. Despite multiple assessment tools that use the same or similar questions, there is a great deal of inconsistency in the operationalization of self-reported childhood adversity for use as a predictor variable. Alternative conceptual models are rarely used and very limited evidence directly contrasts conceptual models to each other. Also, while a cumulative numeric 'ACE Score' is normative, there are differences in the way it is calculated and used in statistical models. We investigated differences in model fit and performance between the …

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Systems Microbiology: From Genomes To Ecosystems, Jizhong Zhou Sep 2020

Systems Microbiology: From Genomes To Ecosystems, Jizhong Zhou

Sustainability Seminar Series

Twenty-first century microbiology faces several grand challenges, e.g., linking structure to functions, mechanisms controlling extremely high diversity, information scaling from genomes to ecosystems, modeling simulation and predictions. With the recent advances of omics technologies, microbiologists have begun to tackle some of these challenges. In this talk, I will report the most recently progresses in these areas at the Institute for Environmental Genomics, with respect to genomic technologies, global microbial diversity and biogeography of wastewater treatment plants, climate warming, community assembly and network tool development, and ecosystem modeling.

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The Impact Of Overgrazing On Needlegrass‐Peashrub‐Forbs Community, D. Bolormaa, B. Avaadorj, B. Enkhmaa, Ts. Altanzul Sep 2020

The Impact Of Overgrazing On Needlegrass‐Peashrub‐Forbs Community, D. Bolormaa, B. Avaadorj, B. Enkhmaa, Ts. Altanzul

IGC Proceedings (1993-2023)

No abstract provided.

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Simulation Tools And Pastoral Resources Dynamics In Sahelian Area: The Senegalese Example, Alassane Bah, Ibra Touré, Alexandre Ickowicz, Amadou Tamsir Diop Sep 2020

Simulation Tools And Pastoral Resources Dynamics In Sahelian Area: The Senegalese Example, Alassane Bah, Ibra Touré, Alexandre Ickowicz, Amadou Tamsir Diop

IGC Proceedings (1993-2023)

No abstract provided.

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The Effect Of The Exclude On The Improvement Of The Rangelands In Hamadan Province, Iran, G. H. Asadian, M. R. Sadeghimanesh Sep 2020

The Effect Of The Exclude On The Improvement Of The Rangelands In Hamadan Province, Iran, G. H. Asadian, M. R. Sadeghimanesh

IGC Proceedings (1993-2023)

No abstract provided.

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Initial Study On The Construction Of Evaluation Index System Of The Herdsman Rights And Interests Protection--Taking Tianshan Pasture Of Urumqi, Xinjiang As An Example, Ying Ao, Litao Feng, Weifeng Chen Sep 2020

Initial Study On The Construction Of Evaluation Index System Of The Herdsman Rights And Interests Protection--Taking Tianshan Pasture Of Urumqi, Xinjiang As An Example, Ying Ao, Litao Feng, Weifeng Chen

IGC Proceedings (1993-2023)

No abstract provided.

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Application Of Nuclear Techniques In Improving Pasture/Range Management, Majid Ajorlo, Ramdzani B. Abdullah Sep 2020

Application Of Nuclear Techniques In Improving Pasture/Range Management, Majid Ajorlo, Ramdzani B. Abdullah

IGC Proceedings (1993-2023)

No abstract provided.

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Some Topics Involving Derived Categories Over Noetherian Formal Schemes., Saurabh Singh Dr. Sep 2020

Some Topics Involving Derived Categories Over Noetherian Formal Schemes., Saurabh Singh Dr.

Doctoral Theses

There are two parts to this thesis and both the parts involve working with derived categories over noetherian formal schemes. Beyond this there is no overlap between them and we discuss them separately.The first part concerns Grothendieck duality on noetherian formal schemes.Grothendieck duality is a vast generalisation of Serreduality in algebraic geometry. The main statements in this theory are expressed in the language of derived categories. We begin with an important special case.Let f : X → Y be a proper map of noetherian schemes which is smooth of relative dimension n. For any G ∈ D+ qc(Y ) (where …

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Trainable Structure Tensors For Autonomous Baggage Threat Detection Under Extreme Occlusion, Taimur Hassan, Samet Akçay, Mohammed Bennamoun, Salman Khan, Naoufel Werghi Sep 2020

Trainable Structure Tensors For Autonomous Baggage Threat Detection Under Extreme Occlusion, Taimur Hassan, Samet Akçay, Mohammed Bennamoun, Salman Khan, Naoufel Werghi

Computer Vision Faculty Publications

Detecting baggage threats is one of the most difficult tasks, even for expert officers. Many researchers have developed computer-aided screening systems to recognize these threats from the baggage X-ray scans. However, all of these frameworks are limited in identifying the contraband items under extreme occlusion. This paper presents a novel instance segmentation framework that utilizes trainable structure tensors to highlight the contours of the occluded and cluttered contraband items (by scanning multiple predominant orientations), while simultaneously suppressing the irrelevant baggage content. The proposed framework has been extensively tested on four publicly available X-ray datasets where it outperforms the state-of-the-art frameworks …

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The Fierce Green Fire: Vol. 11 Issue 1, Wofford College. Department Of Environmental Studies Sep 2020

The Fierce Green Fire: Vol. 11 Issue 1, Wofford College. Department Of Environmental Studies

The Fierce Green Fire

No abstract provided.

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Single‐Molecule 3d Orientation Imaging Reveals Nanoscale Compositional Heterogeneity In Lipid Membranes, Jin Lu, Hesam Mazidi, Tianben Ding, Oumeng Zhang, Matthew D. Lew Sep 2020

Single‐Molecule 3d Orientation Imaging Reveals Nanoscale Compositional Heterogeneity In Lipid Membranes, Jin Lu, Hesam Mazidi, Tianben Ding, Oumeng Zhang, Matthew D. Lew

Electrical & Systems Engineering Publications and Presentations

In soft matter, thermal energy causes molecules to continuously translate and rotate, even in crowded environments, thereby impacting the spatial organization and function of most molecular assemblies, such as lipid membranes. Directly measuring the orientation and spatial organization of large collections (>3000 molecules μm−2) of single molecules with nanoscale resolution remains elusive. In this paper, we utilize SMOLM, single‐molecule orientation localization microscopy, to directly measure the orientation spectra (3D orientation plus “wobble”) of lipophilic probes transiently bound to lipid membranes, revealing that Nile red's (NR) orientation spectra are extremely sensitive to membrane chemical composition. SMOLM images resolve …

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First Insights Into The Vertical Habitat Use Of The Whitespotted Eagle Ray Aetobatus Narinari Revealed By Pop‐Up Satellite Archival Tags, L. R. Brewster, B. V. Cahill, M. N. Burton, C. Dougan, J. S. Herr, L. Issac Norton, S. A. Mcguire, M. Pico, E. Urban-Gedamke, K. Bassos-Hull, J. P. Tyminski, R. E. Hueter, Bradley M. Wetherbee, Mahmood S. Shivji, N. Burnie, M. J. Ajemian Sep 2020

First Insights Into The Vertical Habitat Use Of The Whitespotted Eagle Ray Aetobatus Narinari Revealed By Pop‐Up Satellite Archival Tags, L. R. Brewster, B. V. Cahill, M. N. Burton, C. Dougan, J. S. Herr, L. Issac Norton, S. A. Mcguire, M. Pico, E. Urban-Gedamke, K. Bassos-Hull, J. P. Tyminski, R. E. Hueter, Bradley M. Wetherbee, Mahmood S. Shivji, N. Burnie, M. J. Ajemian

Marine & Environmental Sciences Faculty Articles

The whitespotted eagle ray Aetobatus narinari is a tropical to warm‐temperate benthopelagic batoid that ranges widely throughout the western Atlantic Ocean. Despite conservation concerns for the species, its vertical habitat use and diving behaviour remain unknown. Patterns and drivers in depth distribution of A. narinari were investigated at two separate locations—western North Atlantic (Islands of Bermuda) and Eastern Gulf of Mexico (Sarasota, Florida, USA). Between 2010 and 2014, seven pop‐up satellite archival tags (PSATs) were attached to A. narinari using three methods: a through‐tail suture; external tail‐band; and through‐wing attachment. Retention time ranged from 0–180 days, with tags attached via …

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An Explainable And Statistically Validated Ensemble Clustering Model Applied To The Identification Of Traumatic Brain Injury Subgroups, Dacosta Yeboah, Louis Steinmeister, Daniel B. Hier, Bassam Hadi, Donald C. Wunsch, Gayla R. Olbricht, Tayo Obafemi-Ajayi Sep 2020

An Explainable And Statistically Validated Ensemble Clustering Model Applied To The Identification Of Traumatic Brain Injury Subgroups, Dacosta Yeboah, Louis Steinmeister, Daniel B. Hier, Bassam Hadi, Donald C. Wunsch, Gayla R. Olbricht, Tayo Obafemi-Ajayi

Electrical and Computer Engineering Faculty Research & Creative Works

We present a framework for an explainable and statistically validated ensemble clustering model applied to Traumatic Brain Injury (TBI). The objective of our analysis is to identify patient injury severity subgroups and key phenotypes that delineate these subgroups using varied clinical and computed tomography data. Explainable and statistically-validated models are essential because a data-driven identification of subgroups is an inherently multidisciplinary undertaking. In our case, this procedure yielded six distinct patient subgroups with respect to mechanism of injury, severity of presentation, anatomy, psychometric, and functional outcome. This framework for ensemble cluster analysis fully integrates statistical methods at several stages of …

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Coastal Marsh Degradation Into Ponds Induces Irreversible Elevation Loss Relative To Sea Level In A Microtidal System, Lennert Schepers, Patrick Brennand, Matthew L. Kirwan, Glenn Guntenspergen, Stijn Temmerman Sep 2020

Coastal Marsh Degradation Into Ponds Induces Irreversible Elevation Loss Relative To Sea Level In A Microtidal System, Lennert Schepers, Patrick Brennand, Matthew L. Kirwan, Glenn Guntenspergen, Stijn Temmerman

VIMS Articles

Coastal marshes and their valuable ecosystem services are feared to be lost by sea level rise, yet the mechanisms of marsh degradation into ponds and potential recovery are poorly understood. We quantified and analyzed elevations of marsh surfaces and pond bottoms along a marsh loss gradient (Blackwater River, Maryland, USA). Our analyses show that ponds deepen with increasing tidal channel width connecting the ponds to the river, indicating a new feedback mechanism where channels lead to enhanced tidal export of pond bottom material. Pond elevations also decrease with increasing pond size, consistent with previous work identifying a positive feedback between …

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