Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

2021

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 24781 - 24810 of 27886

Full-Text Articles in Physical Sciences and Mathematics

Summer Research Fellowship Project Descriptions 2021, Clark Science Center's Summer Research Fellows Program Jan 2021

Summer Research Fellowship Project Descriptions 2021, Clark Science Center's Summer Research Fellows Program

SURF Abstracts (Women in Science)

A summary of research done by Smith College’s 2021 Summer Research Fellowship (SURF) Program participants. Ever since its 1967 start, SURF has been a cornerstone of Smith’s science education. Supervised by faculty mentor-advisors drawn from the Clark Science Center and connected to its eighteen science, mathematics, and engineering departments and programs and associated centers and units. At summer’s end, SURF participants were asked to summarize their research experiences for this publication.

Go to article

Coastal Virginia Social Vulnerability Index At The Block Group Level, Sarah Stafford, Schyler Vander Schaaf Jan 2021

Coastal Virginia Social Vulnerability Index At The Block Group Level, Sarah Stafford, Schyler Vander Schaaf

Data

Following other social vulnerability indexes, including the SoVI® developed by the Hazards & Vulnerability Research Institute at the University of South Carolina, this vulnerability index is based on a principal component analysis (PCA). PCA is a statistical technique that takes as its input a matrix of interrelated socioeconomic variables – in this case those considered to measure various dimensions of social vulnerability – and creates a new set of orthogonal principal components that extract the important variation the underlying input data while reducing the noise and redundancy in the data. After conducting the PCA, the researcher combines the newly created …

Go to article

An Ensemble Approach For Annotating Source Code Identifiers With Part-Of-Speech Tags, Christian D. Newman,, Michael J. Decker, Reem S. Alsuhaibani, Anthony Peruma, Mohamed Wiem Mkaouer, Satyajit Mohapatra, Tejal Vishnoi, Marcos Zampieri, Timothy Sheldon, Emily Hill Jan 2021

An Ensemble Approach For Annotating Source Code Identifiers With Part-Of-Speech Tags, Christian D. Newman,, Michael J. Decker, Reem S. Alsuhaibani, Anthony Peruma, Mohamed Wiem Mkaouer, Satyajit Mohapatra, Tejal Vishnoi, Marcos Zampieri, Timothy Sheldon, Emily Hill

Articles

This paper presents an ensemble part-of-speech tagging approach for source code identifiers. Ensemble tagging is a technique that uses machine-learning and the output from multiple part-of-speech taggers to annotate natural language text at a higher quality than the part-of-speech taggers are able to obtain independently. Our ensemble uses three state-of-the-art part-of-speech taggers: SWUM, POSSE, and Stanford. We study the quality of the ensemble's annotations on five different types of identifier names: function, class, attribute, parameter, and declaration statement at the level of both individual words and full identifier names. We also study and discuss the weaknesses of our tagger to …

Go to article

Data-Driven Reconstruction And Encoding Of Sparse Stimuli Across Convergent Sensory Layers From Downstream Neuronal Network Dynamics, Victor J. Barranca, Yolanda Hu , '22, Zoe Porterfield , '22, Samuel Rothstein , '21, Alex Xuan , '22 Jan 2021

Data-Driven Reconstruction And Encoding Of Sparse Stimuli Across Convergent Sensory Layers From Downstream Neuronal Network Dynamics, Victor J. Barranca, Yolanda Hu , '22, Zoe Porterfield , '22, Samuel Rothstein , '21, Alex Xuan , '22

Mathematics & Statistics Faculty Works

Neuronal networks vary dramatically in size, connectivity structure, and functionality across downstream layers of the brain. This raises the question of whether information is lost as it is re-encoded along compressive and expansive pathways. In this work, we develop a potential data-driven mechanism for the preservation of information in the activity of neuronal networks across downstream layers, which uses the widespread linearity of individual neuronal responses to sufficiently strong ramped artificial inputs to fit a linear input-output mapping across the network. We analyze the dynamics of several families of two-layer neuronal network models, where the input components far outnumber the …

Go to article

Glycinergic Axonal Inhibition Subserves Acute Spatial Sensitivity To Sudden Increases In Sound Intensity, T. P. Franken, B. J. Bondy, D. B. Haimes, Joshua H. Goldwyn, N. L. Golding, P. H. Smith, P. X. Joris Jan 2021

Glycinergic Axonal Inhibition Subserves Acute Spatial Sensitivity To Sudden Increases In Sound Intensity, T. P. Franken, B. J. Bondy, D. B. Haimes, Joshua H. Goldwyn, N. L. Golding, P. H. Smith, P. X. Joris

Mathematics & Statistics Faculty Works

Locomotion generates adventitious sounds which enable detection and localization of predators and prey. Such sounds contain brisk changes or transients in amplitude. We investigated the hypothesis that ill-understood temporal specializations in binaural circuits subserve lateralization of such sound transients, based on different time of arrival at the ears (interaural time differences, ITDs). We find that Lateral Superior Olive (LSO) neurons show exquisite ITD-sensitivity, reflecting extreme precision and reliability of excitatory and inhibitory postsynaptic potentials, in contrast to Medial Superior Olive neurons, traditionally viewed as the ultimate ITD-detectors. In vivo, inhibition blocks LSO excitation over an extremely short window, which, in …

Go to article

Dynamics Of The Auditory Continuity Illusion, Qianyi Cao , '22, Noah Parks , '22, Joshua H. Goldwyn Jan 2021

Dynamics Of The Auditory Continuity Illusion, Qianyi Cao , '22, Noah Parks , '22, Joshua H. Goldwyn

Mathematics & Statistics Faculty Works

Illusions give intriguing insights into perceptual and neural dynamics. In the auditory continuity illusion, two brief tones separated by a silent gap may be heard as one continuous tone if a noise burst with appropriate characteristics fills the gap. This illusion probes the conditions under which listeners link related sounds across time and maintain perceptual continuity in the face of sudden changes in sound mixtures. Conceptual explanations of this illusion have been proposed, but its neural basis is still being investigated. In this work we provide a dynamical systems framework, grounded in principles of neural dynamics, to explain the continuity …

Go to article

Branched Covers Bounding Rational Homology Balls, P. Aceto, J. Meier, Allison N. Miller, M. Miller, Jh Park, A. I. Stipsicz Jan 2021

Branched Covers Bounding Rational Homology Balls, P. Aceto, J. Meier, Allison N. Miller, M. Miller, Jh Park, A. I. Stipsicz

Mathematics & Statistics Faculty Works

Prime power–fold cyclic branched covers along smoothly slice knots all bound rational homology balls. This phenomenon, however, does not characterize slice knots. We give a new construction of nonslice knots that have the above property. The sliceness obstruction comes from computing twisted Alexander polynomials, and we introduce new techniques to simplify their calculation.

Go to article

Why Question-Based Reasoning Leads To Constructive Approach To Knowledge, Olga Kosheleva, Vladik Kreinovich Jan 2021

Why Question-Based Reasoning Leads To Constructive Approach To Knowledge, Olga Kosheleva, Vladik Kreinovich

Departmental Technical Reports (CS)

Once we have partial knowledge, what next question do we usually pursue? Empirical study shows, e.g., that if we know that A \/ B is true, but we do not know whether A is true or B is true, then the usual next step is to ask whether A is true or B is true. This selection of the next step is in line with the constructive approach to knowledge, in which when A \/ B is true, this means that we either know that A is true, or we know that B is true. In this paper, we provide …

Go to article

Temporal Invariance Of Social-Ecological Catchments, Mark A. Kaemingk, Christine N. Bender, Chris Chizinski, Aaron J. Bunch, Kevin L. Pope Jan 2021

Temporal Invariance Of Social-Ecological Catchments, Mark A. Kaemingk, Christine N. Bender, Chris Chizinski, Aaron J. Bunch, Kevin L. Pope

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Natural resources such as waterbodies, public parks, and wildlife refuges attract people from varying distances on the landscape, creating “social-ecological catchments.” Catchments have provided great utility for understanding physical and social relationships within specific disciplines. Yet, catchments are rarely used across disciplines, such as its application to understand complex spatiotemporal dynamics between mobile human users and patchily distributed natural resources. We collected residence ZIP codes from 19,983 angler parties during 2014–2017 to construct seven angler–waterbody catchments in Nebraska, USA. We predicted that sizes of dense (10% utilization distribution) and dispersed (95% utilization distribution) angler–waterbody catchments would change across seasons and …

Go to article

Roost Use And Movements Of Northern Long-Eared Bats In A Southeast Nebraska Agricultural Landscape, Christopher Fill, Craig R. Allen, John F. Benson, Dirac Twidwell Jan 2021

Roost Use And Movements Of Northern Long-Eared Bats In A Southeast Nebraska Agricultural Landscape, Christopher Fill, Craig R. Allen, John F. Benson, Dirac Twidwell

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Bats are important bio-indicators of ecosystem health and provide a number of ecosystem services. White-nose Syndrome and habitat loss have led to the decline of many bat species in eastern North America, including the federally threatened northern long-eared bat, Myotis septentrionalis. White-nose Syndrome was only recently found in Nebraska, which lies on the western extent of this species geographic range. To better understand how this forest-dependent species persists in an agriculturally dominated landscape amid a growing number of pressures, we investigated the roosting habits of this bat at the Homestead National Monument of America, located in southeast Nebraska. We …

Go to article

Impacts Of Extreme Environmental Disturbances On Piping Plover Survival Are Partially Moderated By Migratory Connectivity, Kristen S. Ellis, Michael J. Anteau, Francesca J. Cuthbert, Cheri L. Gratto-Trevor, Joel G. Jorgensen, David J. Newstead, Larkin Powell, Megan M. Ring, Mark H. Sherfy, Rose J. Swift, Dustin L. Toy, David N. Koons Jan 2021

Impacts Of Extreme Environmental Disturbances On Piping Plover Survival Are Partially Moderated By Migratory Connectivity, Kristen S. Ellis, Michael J. Anteau, Francesca J. Cuthbert, Cheri L. Gratto-Trevor, Joel G. Jorgensen, David J. Newstead, Larkin Powell, Megan M. Ring, Mark H. Sherfy, Rose J. Swift, Dustin L. Toy, David N. Koons

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Effective conservation for listed migratory species requires an understanding of how drivers of population decline vary spatially and temporally, as well as knowledge of range-wide connectivity between breeding and nonbreeding areas. Environmental conditions distant from breeding areas can have lasting effects on the demography of migratory species, yet these consequences are often the least understood. Our objectives were to 1) evaluate associations between survival and extreme environmental disturbances at nonbreeding areas, including hurricanes, harmful algal blooms, and oil spills, and 2) estimate migratory connectivity between breeding and nonbreeding areas of midcontinental piping plovers (Charadrius melodus). We used capture …

Go to article

Game-Theoretic Analysis Of Effort Allocation Of Contributors To Public Projects, Jared Soundy, Chenhao Wang, Clay Stevens, Hau Chan Jan 2021

Game-Theoretic Analysis Of Effort Allocation Of Contributors To Public Projects, Jared Soundy, Chenhao Wang, Clay Stevens, Hau Chan

CSE Conference and Workshop Papers

Public projects can succeed or fail for many reasons such as the feasibility of the original goal and coordination among contributors. One major reason for failure is that insufficient work leaves the project partially completed. For certain types of projects anything short of full completion is a failure (e.g., feature request on software projects in GitHub). Therefore, project success relies heavily on individuals allocating sufficient effort. When there are multiple public projects, each contributor needs to make decisions to best allocate his/her limited effort (e.g., time) to projects while considering the effort allocation decisions of other strategic contributors and his/her …

Go to article

Analysis Of Lubricants At Trace Levels Using Infrared Spectroscopy, Tanmai Bandarupalli Jan 2021

Analysis Of Lubricants At Trace Levels Using Infrared Spectroscopy, Tanmai Bandarupalli

Honors Undergraduate Theses

Analysis of trace evidence involved in sexual assault investigations holds considerable potential as a newer avenue of identification when bulk, larger evidence is not found or unreliable. Trace analysis of forensic materials involves common findings such as strands of hair, residues left on clothing, shards of paint or glass, etc. In recent research focused on the analysis of trace materials found as evidence in a sexual assault, there has been promise in condom and bottled lubricant classification based on their chemical profiles that can provide an associative link in an investigation. Few studies have considered the examination of lubricant evidence …

Go to article

Improvement In 14-3-3 Binding Site Prediction, Katherine K. Mccormack Jan 2021

Improvement In 14-3-3 Binding Site Prediction, Katherine K. Mccormack

ScholarsArchive Data

The 14-3-3 family of phospho-binding proteins regulate a variety of major cellular processes through interaction with a network of dynamic proteins. Deregulation of the 14-3-3 interaction network contributes to a variety of degenerative disorders and cancers. Our lab focuses on identifying novel 14-3-3 interactions and understanding how 14-3-3 binding regulates protein function. A major gap in this process is that identifying the phospho-site where 14-3-3 docks on a given protein is time- and resource-consuming. Prediction algorithms have been developed to predict canonical 14-3-3 binding sites, however, there are many non-canonical sites that existing software is unable to predict. To fill …

Go to article

A Narrative Review On Environmental Impacts Of Cannabis Cultivation, Zhonghua Zheng, Kelsey Fiddes, Liangcheng Yang Jan 2021

A Narrative Review On Environmental Impacts Of Cannabis Cultivation, Zhonghua Zheng, Kelsey Fiddes, Liangcheng Yang

Faculty Publications - Agriculture

Interest in growing cannabis for medical and recreational purposes is increasing worldwide. This study reviews the environmental impacts of cannabis cultivation. Results show that both indoor and outdoor cannabis growing is water-intensive. The high water demand leads to water pollution and diversion, which could negatively affect the ecosystem. Studies found out that cannabis plants emit a significant amount of biogenic volatile organic compounds, which could cause indoor air quality issues. Indoor cannabis cultivation is energy-consuming, mainly due to heating, ventilation, air conditioning, and lighting. Energy consumption leads to greenhouse gas emissions. Cannabis cultivation could directly contribute to soil erosion. Meanwhile, …

Go to article

The Adams Spectral Sequence For Topological Modular Forms, Robert Bruner, John Rognes Jan 2021

The Adams Spectral Sequence For Topological Modular Forms, Robert Bruner, John Rognes

Mathematics Faculty Research Publications

The connective topological modular forms spectrum, 𝑡𝑚𝑓, is in a sense initial among elliptic spectra, and as such is an important link between the homotopy groups of spheres and modular forms. A primary goal of this volume is to give a complete account, with full proofs, of the homotopy of 𝑡𝑚𝑓 and several 𝑡𝑚𝑓-module spectra by means of the classical Adams spectral sequence, thus verifying, correcting, and extending existing approaches. In the process, folklore results are made precise and generalized. Anderson and Brown-Comenetz duality, and the corresponding dualities in homotopy groups, are carefully proved. The volume also includes an account …

Go to article

A Review Of Spatial Causal Inference Methods For Environmental And Epidemiological Applications, Brian J. Reich, Shu Yang, Yawen Guan, Andrew B. Giffin, Matthew J. Miller, Ana Rappold Jan 2021

A Review Of Spatial Causal Inference Methods For Environmental And Epidemiological Applications, Brian J. Reich, Shu Yang, Yawen Guan, Andrew B. Giffin, Matthew J. Miller, Ana Rappold

Department of Statistics: Faculty Publications

The scientific rigor and computational methods of causal inference have had great impacts on many disciplines but have only recently begun to take hold in spatial applications. Spatial causal inference poses analytic challenges due to complex correlation structures and interference between the treatment at one location and the outcomes at others. In this paper, we review the current literature on spatial causal inference and identify areas of future work. We first discuss methods that exploit spatial structure to account for unmeasured confounding variables. We then discuss causal analysis in the presence of spatial interference including several common assumptions used to …

Go to article

Treatment Of Inconclusive Results In Firearms Error Rate Studies, Heike Hofmann, Susan Vanderplas, Alicia L. Carriquiry Jan 2021

Treatment Of Inconclusive Results In Firearms Error Rate Studies, Heike Hofmann, Susan Vanderplas, Alicia L. Carriquiry

Department of Statistics: Faculty Publications

★ Defining error rates for firearms evidence ★ Impact of inconclusive decisions on error rates ★ Predictive probabilities and errors

Go to article

Investigating The Efficiency Of Energy Transfer In Vehicular Motion, Joshua M. Etukudo Jan 2021

Investigating The Efficiency Of Energy Transfer In Vehicular Motion, Joshua M. Etukudo

Senior Projects Spring 2021

One of my principal interests in life is transportation which involves building and working with vehicles, and that is why I chose to pursue this project. This write-up, in addition to being a small-scale study of the various properties of automobiles, is to serve as a guide for others who wish to pursue such an endeavor in the years to come. To do this, I first take a look at three of the many key structures which enable vehicular movement: The engine, the wheels and the steering system. After this, I give a detailed recount of how I built the …

Go to article

Tverberg Type Partitions: Sub-Regular And Elliptical Polygons, Tobias Golz Timofeyev Jan 2021

Tverberg Type Partitions: Sub-Regular And Elliptical Polygons, Tobias Golz Timofeyev

Senior Projects Spring 2021

Tverberg's theorem states that given a set S of T(r,d)=(r-1)(d+1)+1 points in Rd, there exists a partition of S into r subsets whose convex hulls intersect. A feature of Tverberg's theorem is that T(r,d) is tight, so in this senior project we investigate Tverberg-type results when |S|. We found that in R2, given a set S of T(r,2)-2=3r-4 points, and assuming r=r1 r2, there exists a partition of S into r sets such that when grouped into r1 collections of r2 sets, the convex hulls of each collection overlap, and we …

Go to article

Materials Anddevices For Integrated Room Temperature Quantum Spintronics, Mehmet Cengi̇z Onbaşli Jan 2021

Materials Anddevices For Integrated Room Temperature Quantum Spintronics, Mehmet Cengi̇z Onbaşli

Turkish Journal of Physics

Recent advances in precise stoichiometry control and high-resolution characterization of advanced spintronicmaterials allowed for the development of integrated spintronic devices, which might enable ultralow power magnonicdevices with multi-THz spin wave bandwidth and topologically protected spin wavefunctions that are robust for fabrica-tion imperfections. In addition, advances in microwave and optical excitation and control of quantum states in diamondnitrogen-vacancy systems (diamond-NV) allowed for ultrasensitive magnetometry and integrated quantum logic applica-tions. Here, an integrated spintronic garnet/diamond-NV quantum system has been reviewed and discussed for logic andmemory applications. After an overview of the recent advances in the growth and characterization of insulating magneticiron garnets, …

Go to article

Hollow-Core Optical Fiber With Eight-Pointed Star Cladding Structure For Low-Loss Transmission In Telecom Bands, Mustafa Ordu Jan 2021

Hollow-Core Optical Fiber With Eight-Pointed Star Cladding Structure For Low-Loss Transmission In Telecom Bands, Mustafa Ordu

Turkish Journal of Physics

In this study, a novel negative curvature hollow-core fiber is proposed for low-loss transmission in thenear-infrared region. We numerically investigate the effect of the cladding structure, which is formed of concentricallyinterlaced squares, to the confinement losses using the finite element modelling. The design has eight cladding tubeswith nested elements placed to the outer edge of the tubes. The confinement losses of the interlaced square core fiberis calculated as low as 0.12 dB/km in the range of 1.3 to 1.65 $\mu$m. The loss profile of the noncircular core design is comparable with the circular cores, and have improved transmission performance at …

Go to article

$\Psi(2s)$ And $J/\Psi$ Production In Pp Collisions At $\Sqrt{S}$ = 7, 8 And 13 Tev, Yasir Ali, Uzma Tabassam, Syed Uzair Ahmed Shah, Atif Arif, Mais Suleymanov, Zain Ul Abidin Jan 2021

$\Psi(2s)$ And $J/\Psi$ Production In Pp Collisions At $\Sqrt{S}$ = 7, 8 And 13 Tev, Yasir Ali, Uzma Tabassam, Syed Uzair Ahmed Shah, Atif Arif, Mais Suleymanov, Zain Ul Abidin

Turkish Journal of Physics

Proton-proton collision is an essential part of high energy physics, as it is a baseline for nucleus-nucleus and hadron-nucleus collisions. Quark-gluon plasma, an exotic state of strongly interacting QCD matter, is routinely produced in heavy nuclei high-energy collisions. Charmonium, the bound states of $c\bar{c}$ produced at the early stages of collisions, are nice probes to examine the properties of matter through which they pass. The differential cross-sections of inclusive $\psi(2S)$ in pp collisions at energies of $\sqrt{s}$ = 7, 8 and 13 TeV have been studied. PYTHIA 8.1 event generator is used for the simulation of data. The differential cross-section …

Go to article

The Effect Of Sn Doping On The Electronic And Mechanical Properties Of Ti${}_{3}$Al${}_{1-X}$Sn${}_{X}$C${}_{2}$ Max Phases, Ayşenur Gencer, Aytaç Erki̇şi̇ Jan 2021

The Effect Of Sn Doping On The Electronic And Mechanical Properties Of Ti${}_{3}$Al${}_{1-X}$Sn${}_{X}$C${}_{2}$ Max Phases, Ayşenur Gencer, Aytaç Erki̇şi̇

Turkish Journal of Physics

The phase pure synthesis of Ti${}_{3}$AlC${}_{2}$ MAX phase is quite difficult and some additives are required to get a phase pure Ti${}_{3}$AlC${}_{2}$ such as Sn. In this study, Sn doped Ti${}_{3}$AlC${}_{2}$ MAX phase has been investigated taking into account the experimental synthesis conditions where some Sn atoms could replace Al atoms in the structure. For this purpose, Ti${}_{3}$Al${}_{1-x}$Sn${}_{x}$C${}_{2}$ with x ranging from 0 to 1 with 0.1 interval has been studied using the first principles method and the results show that all compositions are thermodynamically stable. The electronic properties of these compositions have been studied using band filling theory in …

Go to article

Hydrogen Sensing Properties Of Pd Loaded Tio$_2$ Nanorods, Serkan Büyükköse Jan 2021

Hydrogen Sensing Properties Of Pd Loaded Tio$_2$ Nanorods, Serkan Büyükköse

Turkish Journal of Physics

The hydrogen sensing performance of palladium (Pd) catalyst loaded TiO$_2$ nanorods based sensors were investigated. TiO$_2$ nanorods were grown on Al$_2$O$_3$ substrate by a facile hydrothermal process. TiO$_2$ nanorods (NRs) were functionalized with Pd metal by RF magnetron sputtering. Samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques for structural and morphological analysis. Sensor measurements toward H$_2$ and some volatile organic compounds (VOCs) such as acetone, ethanol, xylene and toluene were performed by varying gas concentrations at different temperatures. The sensors were found to exhibit excellent sensitivities towards different hydrogen concentrations ranging from 25 to 1000 …

Go to article

The Effect Of Two Different Substituted Atoms In Lithium Positions On The Structureof Garnet-Type Solid Electrolytes, Sevda Saran, Osman Murat Özkendi̇r, Ülfet Atav Jan 2021

The Effect Of Two Different Substituted Atoms In Lithium Positions On The Structureof Garnet-Type Solid Electrolytes, Sevda Saran, Osman Murat Özkendi̇r, Ülfet Atav

Turkish Journal of Physics

Li${}_{7}$La${}_{3}$Zr${}_{2}$O${}_{12}$ (LLZO), lithium lanthanum zirconate is a promising garnet-type solid electrolyte that is being intensively studied for solid-state lithium batteries. The properties of LLZO such as compatibility with the lithium electrode, stability, and ionic conductivity make them to be used in all solid-state batteries. Moreover, lithium ion concentration and distribution, doping different cations, chemical composition, and interaction between different dopants have remarkable effects on the ionic conduction of LLZO material. Herein, we investigate the solid electrolyte, Li${}_{6.4}$(Ga${}_{(1-y)}$In${}_{(y)}$)${}_{0.2}$La${}_{3}$Zr${}_{2}$O${}_{12}$ (y = 0.05, 0.10, 0.15, 0.20), by probing the influence of indium substitution to gallium sites at the same lithium concentration on the …

Go to article

The Investigation Of The Complex Dielectric And Electric Modulus Of Al/Mg${}_{2}$Si/P-Si Schottky Diode And Its Ac Electrical Conductivity In A Wide Frequency Range, Ömer Sevgi̇li̇ Jan 2021

The Investigation Of The Complex Dielectric And Electric Modulus Of Al/Mg${}_{2}$Si/P-Si Schottky Diode And Its Ac Electrical Conductivity In A Wide Frequency Range, Ömer Sevgi̇li̇

Turkish Journal of Physics

The Al/Mg${}_{2}$Si/p-Si Schottky diode was fabricated using spin coating. The real ($\varepsilon$$\mathrm{\prime}$) and imaginary ($\varepsilon$$\mathrm{\prime}$$\mathrm{\prime}$) components of complex dielectric ($\varepsilon$*), the real (M$\mathrm{\prime}$) and imaginary (M$\mathrm{\prime}$$\mathrm{\prime}$) components of complex electric modulus (M*) and AC electrical conductivity ($\sigma$${}_{AC}$) of the fabricated Al/Mg${}_{2}$Si/p-Si Schottky diode (SD) were examined by using the impedance spectroscopy (IS) measurements in a wide frequency range of 1 kHz-1 MHz. The $\varepsilon$$\mathrm{\prime}$ and $\varepsilon$$\mathrm{\prime}$$\mathrm{\prime}$ were obtained using the value of measured capacitance and conductance while the values of dielectric loss tangent (tan$\delta$, M$\mathrm{\prime}$, M$\mathrm{\prime}$$\mathrm{\prime}$ and $\sigma$${}_{AC}$${}_{\ }$were obtained using the value of $\varepsilon$$\mathrm{\prime}$ and $\varepsilon$$\mathrm{\prime}$$\mathrm{\prime}$. While the values …

Go to article

Sputtered 2d Transition Metal Dichalcogenides: From Growth To Deviceapplications, Merve Acar, Emre Gür Jan 2021

Sputtered 2d Transition Metal Dichalcogenides: From Growth To Deviceapplications, Merve Acar, Emre Gür

Turkish Journal of Physics

Starting from graphene, 2D layered materials family has been recently set up more than 100 different materials with variety of different class of materials such as semiconductors, metals, semimetals, superconductors. Among these materials, 2D semiconductors have found especial importance in the state of the art device applications compared to that of the current conventional devices such as (which material based for example Si based) field effect transistors (FETs) and photodetectors during the last two decades. This high potential in solid state devices is mostly revealed by the transition metal dichalcogenides (TMDCs) semiconductor materials such as MoS${}_{2}$, WS${}_{2}$, MoSe${}_{2}$ and WSe${}_{2}$. …

Go to article

Investigating The Effect Of Self-Trapped Holes In The Current Gain Mechanism Of $ \Beta \Mathbf{-}{\Mathbf{Ga}}_{\Mathbf{2}}{\Mathbf{O}}_{\Mathbf{3}}$ Schottky Diode Photodetectors, Fati̇h Akyol Jan 2021

Investigating The Effect Of Self-Trapped Holes In The Current Gain Mechanism Of $ \Beta \Mathbf{-}{\Mathbf{Ga}}_{\Mathbf{2}}{\Mathbf{O}}_{\Mathbf{3}}$ Schottky Diode Photodetectors, Fati̇h Akyol

Turkish Journal of Physics

Monoclinic gallium oxide $(\beta\mathrm{-}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{3}})$ has found great research interest in solar blind photodetector (SBP) applications due to its' bandgap $\mathrm{\sim}$4.85 eV and availability of high quality native crystal growth. Applications including missile guidance, flame detection, underwater/intersatellite communication and water purification systems require SBPs. $\beta\mathrm{-}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{3}}$ SBPs with high responsivity values have been published indicating internal gain in these devices. The gain has been attributed to accumulation of self-trapped hole (STH) below Schottky metal which the lowers Schottky barrier in these devices based on some approximations rather than a proper device simulation. In this paper, technology computer-aided design (TCAD) simulation of $\beta\mathrm{-}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{3}}$ …

Go to article

Fano Enhancement Of Second Harmonic Field Via Dark-Bright Plasmon Coupling, Mehmet Günay Jan 2021

Fano Enhancement Of Second Harmonic Field Via Dark-Bright Plasmon Coupling, Mehmet Günay

Turkish Journal of Physics

Surface plasmon resonances, the coherent oscillation of free electrons, can concentrate incident field into small volumes much smaller than the incident wavelength. The intense fields at these hot spots enhance the light-matter interactions and may lead to the appearance of nonlinearity. Controlling such nonlinearities is significant for various practical applications. The existence of the long-lived particles in these hotspots may lead to creating Fano resonances in both linear and nonlinear fields. Here we demonstrate that by coupling plasmonic dark modes to the first and the generated second harmonic modes separately, one can gain control over both fields. We find that …

Go to article

First Prev Next Last