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2021

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Full-Text Articles in Physical Sciences and Mathematics

Artificial Intelligence In Cyber Security, University Of Maine Artificial Intelligence Initiative Sep 2021

Artificial Intelligence In Cyber Security, University Of Maine Artificial Intelligence Initiative

General University of Maine Publications

UMaine AI draws top talent and leverages a distinctive set of capabilities from the University of Maine and other collaborating institutions from across Maine and beyond, while it also recruits world-class talent from across the nation and the world. It is centered at the University of Maine, leveraging the university’s strengths across disciplines, including computing and information sciences, engineering, health and life sciences, business, education, social sciences, and more.

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Impact Of Overseeding Cool-Season Annual Forages On Spring Regrowth Of Tifton 85 Bermudagrass, Ricardo A. Reis, Lynn E. Sollenberger, D. Urbano Sep 2021

Impact Of Overseeding Cool-Season Annual Forages On Spring Regrowth Of Tifton 85 Bermudagrass, Ricardo A. Reis, Lynn E. Sollenberger, D. Urbano

IGC Proceedings (1993-2023)

Field observations have shown stand reduction and slow spring regrowth of Tifton 85 bermudagrass (Cynodon spp.) pastures overseeded with temperate forages for grazing during the cool season. This experiment compared the effect of cool-season management programs, including overseeding and use of different grazing treatments, on productivity of Tifton 85 the following warm season. There were seven treatments: four were bermudagrass overseeded with a cool-season annual forage mixture (two grasses and two legumes) and grazed differentially, and three were bermudagrass controls with differences in amount of residual stubble remaining at beginning of autumn. There was only a slight delay in …

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Influence Of Grazing Frequency On Biomass Production Using Several Selected Tropical Grasses, P. Mislevy, F. G. Martin, F. M. Pate, N. F. G. Rethman Sep 2021

Influence Of Grazing Frequency On Biomass Production Using Several Selected Tropical Grasses, P. Mislevy, F. G. Martin, F. M. Pate, N. F. G. Rethman

IGC Proceedings (1993-2023)

To provide commercial growers with forage grasses that produce well throughout the year, there is a constant need for screening and testing new germplasm. Two rhodesgrasses (Chloris gayana cv. Rhods and Callide), four stargrasses (Cynodon nlemfuensis Vanderyst var. nlemfuensis cv. Florona, Zimbabwe, Okeechobee, and Rhodesian No. 2), one bermudagrass (C. dactylon var. dactylon cv. Jiggs), and one creeping signalgrass (Brachiaria humidicola CIAT 6369) were tested under a mob-grazing system. Dry biomass yield increased linearly as grazing frequency (GF) was delayed from 2 to 7 weeks. The cultivars, Florona, Zimbabwe and Okeechobee stargrasses and Jiggs bermudagrass, yielded …

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Variation Of Herbage Intake (Hi) From Upland Pasture, As Influenced By The Grazing Initiation Date (Gid), D. Maæešiæ, M. Kneževiæ, Z. Štafa, J. Leto Sep 2021

Variation Of Herbage Intake (Hi) From Upland Pasture, As Influenced By The Grazing Initiation Date (Gid), D. Maæešiæ, M. Kneževiæ, Z. Štafa, J. Leto

IGC Proceedings (1993-2023)

Studies were conducted on an experimental pasture belonging to the Arrhenatherethum medioeur. and Lolio-Cynosureth. assoc. with D. glomerata, L. perenne and T. repens as main species, at an altitude of 680 m. Four equally sized paddocks (0.3 ha) were grazed by 10 Charolais heifers. The differences in total herbage dry matter intake (HDMI) between the four paddocks with different grazing initiation dates (GID) were significant (P < 0.05). The results of this experiment show that in order to achieve a higher HDMI and better herbage utilization an earlier initiation of grazing is recommended. That is, grazing should commence when the sward height is about 15 cm.

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Mgrre_Pureoilscouttickets_Woodruff_1_21127014260000, Mgrre Sep 2021

Mgrre_Pureoilscouttickets_Woodruff_1_21127014260000, Mgrre

Legacy Scout Tickets from Pure Oil Company

No abstract provided.

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Getting To Neutral: Updating Wcu's Climate And Sustainability Action Plan, Bradley Flamm Sep 2021

Getting To Neutral: Updating Wcu's Climate And Sustainability Action Plan, Bradley Flamm

Sustainability Research & Practice Seminar Presentations

Dr. Bradley Flamm, Office of Sustainability - Getting to Neutral: Updating WCU's Climate and Sustainability Action Plan

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Hyper Ne Structure S State Ofmuonic Helium Atom, D. T. Aznabayev, A. K. Bekbaev, V. I. Korobov Sep 2021

Hyper Ne Structure S State Ofmuonic Helium Atom, D. T. Aznabayev, A. K. Bekbaev, V. I. Korobov

Eurasian Journal of Physics and Functional Materials

In this work the nonrelativistic ionization energies3He2+µ-e-and4He2+µ-e-of helium-muonicatoms are calculated for S states.The estimates are based on the variational principle of exponentialexpansion. Convergence of the numerical values of variational energies is studied by increasing anumber of the basis functions N. That allows to claim that the obtained energy values have 30-33signi cant digits for S states

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Assessment Of The Radiation Situation In The Territory Of The Saumalkol Village, Located Near The Mothballed Uranium Mine Of The North Kazakhstan Region, A. S. Nygymanova, K. A. Kuterbekov, M. M. Bakhtin, E. I. Karpenko, A. M. Kabyshev Sep 2021

Assessment Of The Radiation Situation In The Territory Of The Saumalkol Village, Located Near The Mothballed Uranium Mine Of The North Kazakhstan Region, A. S. Nygymanova, K. A. Kuterbekov, M. M. Bakhtin, E. I. Karpenko, A. M. Kabyshev

Eurasian Journal of Physics and Functional Materials

For the first time after the mothballing of the uranium mine, comprehensive studies were carried out to assess the radiation situation in the territory of the Saumalkol settlement in the North Kazakhstan region. On the territory of the Saumalkol settlement, pedestrian and automobile gamma surveys were carried out, the rates of the ambient equivalent dose of gamma radiation, the flux density of . and . 220Rn particles and the equivalent equilibrium volumetric activity of daughter products of 222Rn and isotopes in residential premises were measured. Samples of soil, water and bottom sediments were taken for laboratory radio spectrometric and radiochemical …

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Unusual Metallic Conductivity Of High-Tc Cuprates, S. Dzhumanov, Sh. R. Malikov, Sh. S. Djumanov Sep 2021

Unusual Metallic Conductivity Of High-Tc Cuprates, S. Dzhumanov, Sh. R. Malikov, Sh. S. Djumanov

Eurasian Journal of Physics and Functional Materials

The intrinsic mechanisms of the unusual metallic transports of three types of relevant charge carriers (large polarons, excited (dissociated) polaronic components of bosonic Cooper pairs and bosonic Cooper pairs themselves) along the CuO2 layers of high-Tc cuprates are identified and the new features of metallic conductivity in the CuO2 layers (i.e. ab -planes) of underdoped and optimally doped cuprates are explained. The in-plane conductivity of high-Tc cuprates is associated with the metallic transports of such charge carriers at their scatteringbylattice vibrations in thin CuO2 layers. The proposed charge transport theory in high-Tc cuprates allows to explain consistently the distinctive features …

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Study Of Change In Beryllium Oxide Strength Properties As A Result Of Irradiation With Heavy Ions, M. V. Zdorovets, A. L. Kozlovskiy, D. B. Borgekov, D. I. Shlimas Sep 2021

Study Of Change In Beryllium Oxide Strength Properties As A Result Of Irradiation With Heavy Ions, M. V. Zdorovets, A. L. Kozlovskiy, D. B. Borgekov, D. I. Shlimas

Eurasian Journal of Physics and Functional Materials

The paper presents data on changes in strength properties, including data on microhardness, crack resistance, bending strength and wear of BeO ceramics as a result of irradiation with heavy accelerated ions. O2+ Kr15+ The following types of ions were selected as heavy ions: (28 MeV), Ar8+ (70 MeV), (147 MeV), Xe22+ (230 MeV). Radiation doses were 10 13 -10 15 ion/cm2 , which make it possible to assess the effect of both single defects arising from radiation, and cluster overlapping defective areas occurring at large radiation doses. During the studies carried out, it was found that an increase in the …

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Influence Of Cu+ Impurity On The Efficiency Of Creation Of Electron Hole Trapping Centers In Irradiated Na2so4-Cu Crystals, T. N. Nurakhmetov, B. N. Yussupbekova, A. M. Zhunusbekov, D. H. Daurenbekov, B. M. Sadykova, K. B. Zhangylyssov, T. T. Alibay, D. A. Tolekov Sep 2021

Influence Of Cu+ Impurity On The Efficiency Of Creation Of Electron Hole Trapping Centers In Irradiated Na2so4-Cu Crystals, T. N. Nurakhmetov, B. N. Yussupbekova, A. M. Zhunusbekov, D. H. Daurenbekov, B. M. Sadykova, K. B. Zhangylyssov, T. T. Alibay, D. A. Tolekov

Eurasian Journal of Physics and Functional Materials

The mechanisms of creation of impurity and intrinsic electron-hole trapping centers in Na2SO4 . Cu crystals have been investigated by spectroscopic methods. It is shown that impurity and intrinsic electron-hole trapping centers in the crystal lattice Na2SO4 . Cu are created in the same energy distances approximately 3.87-4.0 eV and 4.43-4.5 eV. During the annealing of electron-hole trapping centers, the energy of the re combination processes is transferred to impurities.

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Influence Of Plasma Electrolytic Hardening Modes On The Structure And Properties Of 65g Steel, B. K. Rakhadilov, R. S. Kozhanova, D. Baizhan, L. G. Zhurerova, G. U. Yerbolatova, A. A. Kalitova, L. N. Zhanuzakova Sep 2021

Influence Of Plasma Electrolytic Hardening Modes On The Structure And Properties Of 65g Steel, B. K. Rakhadilov, R. S. Kozhanova, D. Baizhan, L. G. Zhurerova, G. U. Yerbolatova, A. A. Kalitova, L. N. Zhanuzakova

Eurasian Journal of Physics and Functional Materials

This work presented a study of the structure, hardness and wear resistance of 65G steel treated with electrolyte-plasma hardening under different conditions. The electrolyte-plasma hardening technology and a laboratoryinstallation for the realisation of electrolyte-plasma hardening are also described. After electrolyte-plasmahardening,wehave established thata modifiedlayer consistsofthe a-phase (martensite) and M3C cementite. The study results showed that electrolyte-plasma hardening makes it possible to obtainlayersonthe65G steel surface thatprovidesan increasein microhardnessby2.6 times,wear resistanceby two times,resistance to abrasivewearby1.7 times compared to the original samples. In addition, local hardening ensures the achievement of technical and economic effects due to the absence of the need to isolate an …

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Conducting And Dielectric Properties Of Na3fe2(Po4)3 And Na2fepo4f, A. A. Nogai, Zh. M. Salikhodzha, A. S. Nogai, D. E. Uskenbaev Sep 2021

Conducting And Dielectric Properties Of Na3fe2(Po4)3 And Na2fepo4f, A. A. Nogai, Zh. M. Salikhodzha, A. S. Nogai, D. E. Uskenbaev

Eurasian Journal of Physics and Functional Materials

In this research, the structure parameters, conducting and dielectric properties of Na3Fe2(PO4)3 and Na2FePO4F polycrystals were studied obtained by solid-phase synthesis. The phase transition temperatures, conducting and dielectric parameters of Na3Fe2(PO4)3 and Na2FePO4F polycrystals were refined. A comparative evaluation of the conductive properties of Na3Fe2(PO4)3 and Na2FePO4F polycrystals is given in this article. The prospects of using of Na3Fe2(PO4)3 and Na2FePO4F are justified as electrode materials in sodium ion batteries.

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Mechanisms For The Creation Of Intrinsic Electron-Hole Trapping Centers In A Caso4 Crystal, T. N. Nurakhmetov, K. B. Zhangylyssov, A. M. Zhunusbekov, D. H. Daurenbekov, T. T. Alibay, B. M. Sadykova, B. N. Yussupbekova, D. A. Tolekov Sep 2021

Mechanisms For The Creation Of Intrinsic Electron-Hole Trapping Centers In A Caso4 Crystal, T. N. Nurakhmetov, K. B. Zhangylyssov, A. M. Zhunusbekov, D. H. Daurenbekov, T. T. Alibay, B. M. Sadykova, B. N. Yussupbekova, D. A. Tolekov

Eurasian Journal of Physics and Functional Materials

The mechanism of creation of electron-hole trapping centers in CaSO4 at 15-300 K was investigated by the methods of vacuum-ultraviolet and thermoactivation spectroscopy. It is shown that electron-hole trapping centers are formed upon trap of electrons in the anionic complexes SO2. and localization 4 of holes in the form of SO. radical. Based on the measurement of the spectrum of excitation of 4 long-wavelength recombination emission at 3.0-3.1 eV and 2.7 eV, the energy distance of the formed electron-hole trapping centers was estimated (4.43 eV and 3.87 eV).

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Features Of Model Thin-Film Solar Cells Photoelectric Characteristics Based On A Non-Toxic Multi-Component Connection Cuzn₂Als₄, D. Sergeyev, K. Shunkeyev, B. Kuatov, N. Zhanturina Sep 2021

Features Of Model Thin-Film Solar Cells Photoelectric Characteristics Based On A Non-Toxic Multi-Component Connection Cuzn₂Als₄, D. Sergeyev, K. Shunkeyev, B. Kuatov, N. Zhanturina

Eurasian Journal of Physics and Functional Materials

In this paper, the features of the characteristics of model thin-film solar cells based on the non-toxic multicomponent compound CuZn2AlS4(CZAS) are considered. The main parameters (open-circuit voltage, short-circuit current, fill factor, efficiency) and characteristics (quantum efficiency, current-voltage characteristic) of thin-film solar cells based on CZAS have been determined. The minimum optimal thickness of the CZAS absorber is found (1-1.25 microns). Deterioration of the performance of solar cells with an increase in operating temperature (280-400 K) is shown. It is revealed that in the wavelength range of 390-500 nm CZAS has a high external quantum efficiency, which …

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Recognition And Screening For Chagas Disease In The Usa, Rachel Marcus, Andres F. Henao-Martinez, Melissa Nolan Ph.D., Mph, Elizabeth Livingston, Stephen A. Klotz, Robert H. Gilman, Monica Miranda-Schaeubinger, Sheba Meymandi Sep 2021

Recognition And Screening For Chagas Disease In The Usa, Rachel Marcus, Andres F. Henao-Martinez, Melissa Nolan Ph.D., Mph, Elizabeth Livingston, Stephen A. Klotz, Robert H. Gilman, Monica Miranda-Schaeubinger, Sheba Meymandi

Faculty Publications

Chagas disease (CD), caused by the protozoan Trypanosoma cruzi, is a public health concern, mainly among countries in South and Central America. However, despite the large number of immigrants from endemic countries living in the USA, awareness of CD is poor in the medical community, and therefore it is significantly underdiagnosed. To avoid the catastrophic cardiac complications of CD and to prevent maternal–fetal transmission, widespread educational programs highlighting the need for diagnosis are urgently needed.

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Pathways To A Zero Carbon New York: Understanding Solar Resistance And Overcoming Barriers To Renewable Deployment, Emory Goodwin '23, Carson Halabi '22, Madison Hurtgen '22, Lillian Norton-Brainerd '23 Sep 2021

Pathways To A Zero Carbon New York: Understanding Solar Resistance And Overcoming Barriers To Renewable Deployment, Emory Goodwin '23, Carson Halabi '22, Madison Hurtgen '22, Lillian Norton-Brainerd '23

Student Scholarship

The mounting climate crisis, brought on by fossil fuel burning, requires ambitious climate solutions. By enacting the CLCPA (Climate Leadership and Protection Act) in 2019, New York has led the U.S. in its movement to cut greenhouse gas emissions and deploy renewable energy on a large scale. Acres of photovoltaic solar panels have been installed throughout the state in recent years. The rapid development of large scale solar has faced local opposition. The rationale behind community opposition reveals more complexity than the typical “Not In My Backyard” (NIMBY) argument. Residents of Kirkland, NY voiced their opinions of a proposed 60 …

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On The Inertia Conjecture And Its Generalizations., Soumyadip Das Dr. Sep 2021

On The Inertia Conjecture And Its Generalizations., Soumyadip Das Dr.

Doctoral Theses

This thesis concerns problems related to the ramification behaviour of the branched Galois covers of smooth projective connected curves defined over an algebraically closed field of positive characteristic. Our first main problem is the Inertia Conjecture proposed by Abhyankar in 2001. We will show several new evidence for this conjecture. We also formulate a certain generalization of it which is our second problem, and we provide evidence for it. We give a brief overview of these problems in this introduction and reserve the details for Chapter 4.Let k be an algebraically closed field, and U be a smooth connected affine …

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Convergence Analysis Of Some Tent-Based Schemes For Linear Hyperbolic Systems, Dow Drake, Jay Gopalakrishnan, Joachim Schöberl, Christoph Wintersteiger Sep 2021

Convergence Analysis Of Some Tent-Based Schemes For Linear Hyperbolic Systems, Dow Drake, Jay Gopalakrishnan, Joachim Schöberl, Christoph Wintersteiger

Mathematics and Statistics Faculty Publications and Presentations

Finite element methods for symmetric linear hyperbolic systems using unstructured advancing fronts (satisfying a causality condition) are considered in this work. Convergence results and error bounds are obtained for mapped tent pitching schemes made with standard discontinuous Galerkin discretizations for spatial approximation on mapped tents. Techniques to study semidiscretization on mapped tents, design fully discrete schemes, prove local error bounds, prove stability on spacetime fronts, and bound error propagated through unstructured layers are developed.

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Scaling Limits Of Some Random Interface Models., Biltu Dan Dr. Sep 2021

Scaling Limits Of Some Random Interface Models., Biltu Dan Dr.

Doctoral Theses

In this thesis, we study some probabilistic models of random interfaces. Interfaces between different phases have been topic of considerable interest in statistical physics. These interfaces are described by a family of random variables, indexed by the ddimensional integer lattice, which are considered as a height configuration, namely they indicate the height of the interface above a reference hyperplane. The models are defined in terms of an energy function (Hamiltonian), which defines a Gibbs measure on the set of height configurations. More formally, letÏ• = {Ï•x}x∈Z dbe a collection of real numbers indexed by the d-dimensional integer lattice Z d. …

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Neuron-Derived Extracellular Vesicles Modulate Microglia Activation And Function, Hui Peng, Brock T. Harvey, Christopher I. Richards, Kimberly Nixon Sep 2021

Neuron-Derived Extracellular Vesicles Modulate Microglia Activation And Function, Hui Peng, Brock T. Harvey, Christopher I. Richards, Kimberly Nixon

Pharmaceutical Sciences Faculty Publications

Microglia act as the immune cells of the central nervous system (CNS). They play an important role in maintaining brain homeostasis but also in mediating neuroimmune responses to insult. The interactions between neurons and microglia represent a key process for neuroimmune regulation and subsequent effects on CNS integrity. However, the molecular mechanisms of neuron-glia communication in regulating microglia function are not fully understood. One recently described means of this intercellular communication is via nano-sized extracellular vesicles (EVs) that transfer a large diversity of molecules between neurons and microglia, such as proteins, lipids, and nucleic acids. To determine the effects of …

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Functional Nanoparticles: Tin Monoxide And Molybdenum Disulfide Quantum Dots On Graphene Nanosheets, Denys Vidish Sep 2021

Functional Nanoparticles: Tin Monoxide And Molybdenum Disulfide Quantum Dots On Graphene Nanosheets, Denys Vidish

Electronic Thesis and Dissertation Repository

Light harvesting can be referred to the use of an ensemble of different nanoparticles, or quantum dots, or other absorbers to optimize the ability to capture a given spectrum of electromagnetic radiation (for example the solar spectrum under specific atmospheric conditions) in a light-absorbing system. To this end, different nanoparticles play complementary functions within the system and absorb or scatter light at different wavelength intervals. Light harvesting finds applications in fields as diverse as solar cells, photosynthesis and photocatalysis. Graphene supporting a set of different semiconducting nanoparticles has often been proposed as light harvesters. To further this concept, my thesis …

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Vermiculations In Painted Caves: New Inputs From Laboratory Experiments And Field Observations, Perrine Freydier, Eric Weber, Jérôme Martin, Pierre-Yves Jeannin, Béatrice Guerrier, Frédéric Doumenc Sep 2021

Vermiculations In Painted Caves: New Inputs From Laboratory Experiments And Field Observations, Perrine Freydier, Eric Weber, Jérôme Martin, Pierre-Yves Jeannin, Béatrice Guerrier, Frédéric Doumenc

International Journal of Speleology

Vermiculations are aggregates of small particles commonly found on cave walls. They are a major concern for the conservation of painted caves, as they can potentially alter valuable prehistoric cave paintings. A previous rheological study of fine sediment deposits on cave walls revealed that this material can undergo a solid-to-liquid transition triggered by variations in the chemical composition of the water film on the wall. Such a transition could occur at the origin of vermiculations by allowing the sediment to flow under low mechanical stress. In this work, we provide quantitative information on the conditions leading to this transition and …

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Nutritive Value Of Double Cropped Corn For Ruminant Production, D. Vaz Martins, A. Fassio Sep 2021

Nutritive Value Of Double Cropped Corn For Ruminant Production, D. Vaz Martins, A. Fassio

IGC Proceedings (1993-2023)

The viability of double cropping corn (Zea mays L.) in Uruguay, germplasm combination, dry matter yield and nutritive value were evaluated. An early (E) maturing hybrid, an early to medium (E-M) one and an E-M variety were planted as spring crops. One E-M hybrid, one medium to late (M-L) hybrid and a late (L) variety were planted as a second crop. PVC laboratory scale silo of the spring crop and the whole plant of the summer crop were chemically analyzed. The nutritive value of the silages were related to plant maturity stage. No differences were detected in nutritive value among …

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Two-Dimensional Monitoring Of Spatial Distribution Of Herbage Mass Under Grazing, S. Ogura, Masahiko Hirata Sep 2021

Two-Dimensional Monitoring Of Spatial Distribution Of Herbage Mass Under Grazing, S. Ogura, Masahiko Hirata

IGC Proceedings (1993-2023)

Spatial distribution of herbage mass (HM) was monitored two-dimensionally during the grazing season (from May to November) in a bahiagrass pasture rotationally grazed by cattle. An electronic capacitance probe was used to estimate HM in 1464 permanent positions (50 × 50 cm) whose centres formed 1.5 × 1.5 m grids in the central 90 × 34.5 m area of the pasture. The highest mean HM was in September and October, while coefficient of variation in November. The two-dimensional charting of HM showed almost stable spatial patterns throughout the grazing season, with some patches of high HM appearing and disappearing. The …

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The Effect Of Herbage Mass Of A Pasture On The Spatially Heterogeneous Grazing By Cattle, S. Ogura, Masahiko Hirata Sep 2021

The Effect Of Herbage Mass Of A Pasture On The Spatially Heterogeneous Grazing By Cattle, S. Ogura, Masahiko Hirata

IGC Proceedings (1993-2023)

To obtain information on spatially heterogeneous grazing by large herbivores at different time scales, spatial distribution of herbage mass and rate of defoliation was investigated on a bahiagrass (Paspalum notatum Flügge) pasture grazed by cattle during 4 to 5-day grazing periods in May, August and October. Pre-grazing herbage mass (Mpre) showed decreasing mean values and increasing spatial heterogeneity with the progress of grazing in all grazing periods, while the rate of defoliation showed inconsistent changes with season. Spatial distribution of the rate of defoliation was always more heterogeneous than that of Mpre. The correlation coefficient …

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Relationships Between Spatial Distributions Of Herbage Mass And Utilization In A Pasture Progressively Grazed By Cattle, Masahiko Hirata, S. Ogura Sep 2021

Relationships Between Spatial Distributions Of Herbage Mass And Utilization In A Pasture Progressively Grazed By Cattle, Masahiko Hirata, S. Ogura

IGC Proceedings (1993-2023)

To obtain some information about the mechanisms behind the spatially heterogeneous grazing of a pasture by large herbivores, the relationships between the spatial distributions of herbage mass, herbage consumption and ingestive behavior were investigated on a bahiagrass (Paspalum notatum Flügge) pasture during a 6-day grazing period with cattle. The animals almost always consumed more herbage from locations with higher pre-grazing herbage masses, which was attributed to greater bite weights. It was suggested that the high spatial heterogeneity in the rate of defoliation was caused mainly by the spatial heterogeneity in both the bite weight and the number of visits …

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Molecular And Supramolecular Structures Of Triiodides And Polyiodobismuthates Of Phenylenediammonium And Its N,N-Dimethyl Derivative, Evgeny V. Dikarev, Zheng Wei, Tatiana A. Shestimerova, Nikita A. Golubev, Mikhail A. Bykov, Andrei V. Mironov, Sergey A. Fateev, Alexey B. Tarasov, Ivan Turkevych, Andrei V. Shevelkov Sep 2021

Molecular And Supramolecular Structures Of Triiodides And Polyiodobismuthates Of Phenylenediammonium And Its N,N-Dimethyl Derivative, Evgeny V. Dikarev, Zheng Wei, Tatiana A. Shestimerova, Nikita A. Golubev, Mikhail A. Bykov, Andrei V. Mironov, Sergey A. Fateev, Alexey B. Tarasov, Ivan Turkevych, Andrei V. Shevelkov

Chemistry Department Faculty Scholarship

Despite remarkable progress in photoconversion efficiency, the toxicity of lead-based hybrid perovskites remains an important issue hindering their applications in consumer optoelectronic devices, such as solar cells, LED displays, and photodetectors. For that reason, lead-free metal halide complexes have attracted great attention as alternative optoelectronic materials. In this work, we demonstrate that reactions of two aromatic diamines with iodine in hydroiodic acid produced phenylenediammonium (PDA) and N,N-dimethyl-phenylenediammonium (DMPDA) triiodides, PDA(I3)2⋅2H2O and DMPDA(I3)I, respectively. If the source of bismuth was added, they were converted into previously reported PDA(BiI4)2⋅I2 …

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Tensor Pooling-Driven Instance Segmentation Framework For Baggage Threat Recognition, Taimur Hassan, Samet Akçay, Mohammed Bennamoun, Salman Khan, Naoufel Werghi Sep 2021

Tensor Pooling-Driven Instance Segmentation Framework For Baggage Threat Recognition, Taimur Hassan, Samet Akçay, Mohammed Bennamoun, Salman Khan, Naoufel Werghi

Computer Vision Faculty Publications

Automated systems designed for screening contraband items from the X-ray imagery are still facing difficulties with high clutter, concealment, and extreme occlusion. In this paper, we addressed this challenge using a novel multi-scale contour instance segmentation framework that effectively identifies the cluttered contraband data within the baggage X-ray scans. Unlike standard models that employ region-based or keypoint-based techniques to generate multiple boxes around objects, we propose to derive proposals according to the hierarchy of the regions defined by the contours. The proposed framework is rigorously validated on three public datasets, dubbed GDXray, SIXray, and OPIXray, where it outperforms the state-of-the-art …

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Based On Atmospheric Physics And Ecological Principle To Assess The Accuracies Of Field Co2 /H2o Measurements From Infrared Gas Analyzers In Closed-Path Eddy-Covariance Systems, Xinhua Zhou, Tian Gao, Yunchao Pang, Hayden Mahan, Xiufen Li, Ning Zheng, Andrew E. Suyker, Tala Awada, Jiaojun Zhu Sep 2021

Based On Atmospheric Physics And Ecological Principle To Assess The Accuracies Of Field Co2 /H2o Measurements From Infrared Gas Analyzers In Closed-Path Eddy-Covariance Systems, Xinhua Zhou, Tian Gao, Yunchao Pang, Hayden Mahan, Xiufen Li, Ning Zheng, Andrew E. Suyker, Tala Awada, Jiaojun Zhu

School of Natural Resources: Faculty Publications

Field CO2 /H2O measurements from infrared gas analyzers in closed-path eddy-covariance systems have wide applications in earth sciences. Knowledge about exactness of these measurements is required to assess measurement applicability. Although the analyzers are specified with uncertainty components (zero drift, gain drift, cross-sensitivities, and precision), exactness for individual measurements is unavailable due to an absence of methodology to comprehend the components as an overall uncertainty. Adopting an advanced definition of accuracy as a range of all measurement uncertainty sources, the specified components are composited into a model formulated for studying analyzers’ CO2 /H2O accuracy …

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