Can Ethanol Affect The Cell Structure - A Dynamic Molecular And Raman Spectroscopy Study, 2020 Universidade do Vale do Paraiba, Brazil
Can Ethanol Affect The Cell Structure - A Dynamic Molecular And Raman Spectroscopy Study, Luis Felipe Carvalho, Laurita Dos Santos, Kate O'Callaghan, Franck Bonnier, Steven Flint, Fiona Lyng, Hugh Byrne
Articles
The role that tobacco consumption plays in the etiology of oral cancer carcinogenesis, and of alcohol consumption acting as a co-factor, have been well established. However, in recent years, the contribution of alcohol consumption alone to oral cancer has been proposed. In fact, a high percentage of patients who develop oral cancer have both habits (tobacco and alcohol consumption), and other small patient groups only consume alcohol or do not have any other identifiable bad habits. In the present study, we demonstrate for the first time, using a combination of dynamic molecular modelling and Raman spectroscopy, that ethanol has a …
Can We Preserve Physically Meaningful "Macro" Analyticity Without Requiring Physically Meaningless "Micro" Analyticity?, 2020 The University of Texas at El Paso
Can We Preserve Physically Meaningful "Macro" Analyticity Without Requiring Physically Meaningless "Micro" Analyticity?, Olga Kosheleva, Vladik Kreinovich
Departmental Technical Reports (CS)
Physicists working on quantum field theory actively used "macro" analyticity -- e.g., that an integral of an analytical function over a large closed loop is 0 -- but they agree that "micro" analyticity -- the possibility to expand into Taylor series -- is not physically meaningful on the micro level. Many physicists prefer physical theories with physically meaningful mathematical foundations. So, a natural question is: can we preserve physically meaningful "macro" analyticity without requiring physically meaningless "micro" analyticity? In the 1970s, an attempt to do it was made by using constructive mathematics, in which only objects generated by algorithms are …
Edge-Coupling Of O-Band Inp Etched-Facet Lasers To Polymer Waveguides On Soi By Micro-Transfer-Printing, 2020 Tyndall National Institute at National University of Ireland, Cork
Edge-Coupling Of O-Band Inp Etched-Facet Lasers To Polymer Waveguides On Soi By Micro-Transfer-Printing, Ruggero Loi, Steven Kelleher, Raja Fazan Gul, Antonio Jose Trindade, David Gomez, Liam O'Faolain, Brian Corbett, Simone Iadanza, Brendan Roycroft, James O'Callaghan, Lei Liu, Kevin Thomas, Agnieszka Gocalinska, Emanuele Pelucchi, Alexander Farrell
Cappa Publications
O-band InP etched facets lasers were heterogeneously integrated by micro-transfer-printing into a 1.54~\mu \text{m} deep recess created in the 3~\mu \text{m} thick oxide layer of a 220 nm SOI wafer. A 7\times 1.5\,\,\mu \text{m}^{2} cross-section, 2 mm long multimode polymer waveguide was aligned to the ridge post-integration by e-beam lithography with < 0.7~\mu \text{m} lateral misalignment and incorporated a tapered silicon waveguide. A 170 nm thick metal layer positioned at the bottom of the recess adjusts the vertical alignment of the laser and serves as a thermal via to sink the heat to the Si substrate. This strategy shows a roadmap for active polymer waveguide-based photonic integrated circuits.
Computational Modeling Of Charge And Excitation Energy Transfer Dynamics In Complex Environments, 2020 The Graduate Center, City University of New York
Computational Modeling Of Charge And Excitation Energy Transfer Dynamics In Complex Environments, Ning Chen
Dissertations, Theses, and Capstone Projects
This thesis describes computational simulations of charge and exciton dynamics and quantum calculations of organic conjugated oligomers. A comprehensive computational study of charge hopping dynamics was conducted for a model of disordered chain of sites coupled to quantum environments. Time-dependent mean square displacement, diffusion constant, and mobility were calculated by three different computational methods for solving the master equation, which validate the accuracy of calculations. Approximate rate kernels were also tested to understand the effects of approximations in representing quantum environments. In addition to the effects of temperature and disorder, different values of the gradient in the site energy were …
In-Situ Gold-Ceria Nanoparticles: Superior Optical Fluorescence Quenching Sensor For Dissolved Oxygen, 2020 Old Dominion University
In-Situ Gold-Ceria Nanoparticles: Superior Optical Fluorescence Quenching Sensor For Dissolved Oxygen, Nader Shehata, Ishac Kandas, Effat Samir
Electrical & Computer Engineering Faculty Publications
Cerium oxide (ceria) nanoparticles (NPs) have been proved to be an efficient optical fluorescent material through generating visible emission (~530 nm) under violet excitation. This feature allowed ceria NPs to be used as an optical sensor via the fluorescence quenching Technique. In this paper, the impact of in-situ embedded gold nanoparticles (Au NPs) inside ceria nanoparticles was studied. Then, gold–ceria NPs were used for sensing dissolved oxygen (DO) in aqueous media. It was observed that both fluorescence intensity and lifetime were changed due to increased concentration of DO. Added gold was found to enhance the sensitivity of ceria to DO …
Overview Of Trends In Indian Optics Research (2008 – 2018), 2020 Kuvempu University
Overview Of Trends In Indian Optics Research (2008 – 2018), Mallikarjun Kappi, Biradar B S
Library Philosophy and Practice (e-journal)
The present study deals with the assessment of Indian optics research output as reflected in Web of Science (WOS) database for the period 2008 to 2018 for identifying the research output in the field of optics literature. It also provides a comparative evaluation and performance of different types of scientometric indicators, such as number of publications, number of citations and collaboration from India. The Indian optics research has increased exponentially over the last decade.
Duality In A Model Of Layered Superfluids And Sliding Phases, 2020 The Graduate Center, City University of New York
Duality In A Model Of Layered Superfluids And Sliding Phases, Steven Vayl
Dissertations, Theses, and Capstone Projects
The intent of my project is to determine if the proposal of sliding phases in XY layered systems has physical ground. It will be done by comparing numerical and analytical results for a layered XY models. Sliding phases were first proposed in the context of DNA complexes and then extended to XY models, 1D coupled wires and superfluid films. The existence of the sliding phase would mean that there is a phase transition from 3D to 2D behavior. Such systems have been studied both in the clean case and with disorder. The idea of the sliding phases is based on …
Sociophysics Analysis Of Multi-Group Conflicts, 2020 Cleveland State University
Sociophysics Analysis Of Multi-Group Conflicts, Miron Kaufman, Hung T. Diep, Sanda Kaufman
Physics Faculty Publications
© 2020 by the authors. We present our research on the application of statistical physics techniques to multi-group social conflicts. We identify real conflict situations of which the characteristics correspond to the model. We offer realistic assumptions about conflict behaviors that get factored into model-generated scenarios. The scenarios can inform conflict research and strategies for conflict management. We discuss model applications to two-and three-group conflicts. We identify chaotic time evolution of mean attitudes and the occurrence of strange attractors. We examine the role that the range of interactions plays with respect to the occurrence of chaotic behavior.
Radiation-Induced Electron And Hole Traps In Ge1-XSnX (X = 0-0.094), 2020 Air Force Institute of Technology
Radiation-Induced Electron And Hole Traps In Ge1-XSnX (X = 0-0.094), Michael R. Hogsed, Kevin Choe, Norman Miguel, Buguo Wang, John Kouvetakis
Faculty Publications
The band structure of germanium changes significantly when alloyed with a few percent concentrations of tin, and while much work has been done to characterize and exploit these changes, the corresponding deep-level defect characteristics are largely unknown. In this paper, we investigate the dominant deep-level defects created by 2 MeV proton irradiation in Ge1 -xSnx (x = 0.0, 0.020, 0.053, 0.069, and 0.094) diodes and determine how the ionization energies of these defects change with tin concentrations. Deep-level transient spectroscopy measurements approximate the ionization energies associated with electron transitions to/from the valence band (hole traps) and conduction band (electron traps) …
Teaching Doppler Ultrasound In An Introductory Laboratory For Pre-Health Students, 2020 Portland State University
Teaching Doppler Ultrasound In An Introductory Laboratory For Pre-Health Students, Theodore Stedmark, Thomas Allen, Ralf Widenhorn
Physics Faculty Publications and Presentations
We present a novel activity to demonstrate the Doppler shift of a sound wave, incident at an angle, upon a moving reflector. This activity is intended for use in an introductory physics laboratory focused on preparing students for the health and medical fields. The activity is designed to simulate Doppler velocity measurements from ultrasound imaging. While there have been previous qualitative discussions of blood flow measurements in the physics education literature, they were without associated laboratory activities.1 The lab can be part of a life science physics curriculum that has been identified in need of reforms to meet the …
Defect-Free Plastic Deformation Through Dimensionality Reduction And Self-Annihilation Of Topological Defects In Crystalline Solids, 2020 Idaho National Laboratory
Defect-Free Plastic Deformation Through Dimensionality Reduction And Self-Annihilation Of Topological Defects In Crystalline Solids, Yipeng Gao, Yongfeng Zhang, Larry K. Aagesen, Jianguo Yu, Min Long, Yunzhi Wang
Computer Science Faculty Publications and Presentations
As a signature of symmetry-breaking processes, the generation and annihilation of topological defects (domain walls, strings, etc.) are of great interest in condensed matter physics and cosmology. Here we propose a distinctive self-organization process through phase transitions, in which all the generated topological defects are dimensionality reduced and self-annihilated. In crystalline solids, such a unique mechanism allows a perfect single crystal after plastic deformation, which originates from the coupling of different types of broken symmetries.
Density Functional Theory Study Of Two-Dimensional Boron Nitride Films, 2020 The Graduate Center, City University of New York
Density Functional Theory Study Of Two-Dimensional Boron Nitride Films, Pradip R. Niraula
Dissertations, Theses, and Capstone Projects
Since graphene was isolated in 2004, the number of two-dimensional (2D) materials and their scientific relevance have grown exponentially. Besides graphene, one of the most important and technolocially promizing 2D materials that has emerged in recent years is hexagonal boron nitride, in its monolayer or multilayer form. In my thesis work, I used density functional theory (DFT) calculations to investigate the properties of boron nitride films. In particular, I first studied the properties (i.e. formation energy, defect states, and structure) of point charged defects in monolayer and bilayer hexagonal boron nitride, and subsequently, I focused on the linear and nonlinear …
Kinetic Alfvénwaves Frommagnetotail To The Ionosphere In Global Hybrid Simulation Associated With Fast Flows, 2020 Auburn University
Kinetic Alfvénwaves Frommagnetotail To The Ionosphere In Global Hybrid Simulation Associated With Fast Flows, Lei Cheng, Yu Lin, J. D. Perez, Jay R. Johnson, Xueyi Wang
Faculty Publications
We have used the Auburn Global Hybrid Code in 3‐D to study the generation, dynamics, and global structure of kinetic Alfvén waves (KAWs) from the magnetotail to the ionosphere. Our results show that KAWs are generated in magnetic reconnection in the plasma sheet, located around fast flows, and carrying transverse electromagnetic perturbations, parallel Poynting fluxes, parallel currents, and parallel electric field. Overall, shear Alfvénic turbulent spectrum is found in the plasma sheet. The KAWs are shear Alfvén waves possessing short perpendicular wavelength with , where is the perpendicular wave number and the ion Larmor radius. The KAWs are identified by …
Ii-Vi Type-Ii Quantum Dot Superlattices For Novel Applications, 2020 The Graduate Center, City University of New York
Ii-Vi Type-Ii Quantum Dot Superlattices For Novel Applications, Vasilios Deligiannakis
Dissertations, Theses, and Capstone Projects
In this thesis, we discuss the growth procedure and the characterization results obtained for epitaxially grown submonolayer type-II quantum dot superlattices made of II-VI semiconductors. We have investigated the spin dynamics of ZnSe layers with embedded type-II ZnTe quantum dots and the use of (Zn)CdTe/ZnCdSe QDs for intermediate band solar cell (IBSC). Samples with a higher quantum dot density exhibit longer electron spin lifetimes, up to ~1 ns at low temperatures. Tellurium isoelectronic centers, which form in the ZnSe spacer regions as a result of the growth conditions, were also probed. A new growth sequence for type-II (Zn)CdTe/ZnCdSe (QDs) was …
Studying The Kinetics Of The Decomposition Of Sulfur-Containing Phosphorits By Nitric Acid, 2020 Namangan Civil Engineering Institute
Studying The Kinetics Of The Decomposition Of Sulfur-Containing Phosphorits By Nitric Acid, M. M. Sobirov, Sh. V. Raxmonov, T. S. Urozov, A. Aslanov
Scientific Journal of Samarkand University
The kinetics of decomposition of sulfur-containing phosphorits was studied at a rate of 40-100% nitric acid. It has been established that the decomposition process of sulfur-containing phosphorits acid is easy to implement, the components interact within 2.5-30 minutes. The main part of sulfur-containing phosphorits decomposes within 10 minutes
Quantitatively Ranking Incorrect Responses To Multiple-Choice Questions Using Item Response Theory, 2020 Rowan University
Quantitatively Ranking Incorrect Responses To Multiple-Choice Questions Using Item Response Theory, Trevor Smith, Kyle J. Louis, Bartholemew J. Ricci Iv, Nasrine Bendjilali
Faculty Scholarship for the College of Science & Mathematics
Research-based assessment instruments (RBAIs) are ubiquitous throughout both physics instruction and physics education research. The vast majority of analyses involving student responses to RBAI questions have focused on whether or not a student selects correct answers and using correctness to measure growth. This approach often undervalues the rich information that may be obtained by examining students’ particular choices of incorrect answers. In the present study, we aim to reveal some of this valuable information by quantitatively determining the relative correctness of various incorrect responses. To accomplish this, we propose an assumption that allows us to define relative correctness: students who …
Studying Resting State And Stimulus Induced Bold Activity Using The Generalized Ising Model And Independent Component Graph Analysis, 2020 The University of Western Ontario
Studying Resting State And Stimulus Induced Bold Activity Using The Generalized Ising Model And Independent Component Graph Analysis, Sivayini Kandeepan
Electronic Thesis and Dissertation Repository
Although many technical advancements have been made, neuroscientists still struggle to explain the underlying behaviour of how brain regions communicate with each other to form large-scale functional networks. functional Magnetic Resonance Imaging (fMRI) has been commonly used to investigate changes between brain regions over time using the Blood Oxygen Level Dependent (BOLD) signal.
The goal of this thesis is to show the applicability of novel techniques and tools, such as the generalized Ising model (GIM) and the independent component graph analysis (GraphICA), to obtain information on the functional connectivity of populations with altered perception of consciousness. The GIM was used …
Attenuation Of Ultrasonic Waves And Acoustic Gruneisen Parameter In Aluminum Alloys, 2020 Samarkand State University
Attenuation Of Ultrasonic Waves And Acoustic Gruneisen Parameter In Aluminum Alloys, F. R. Axmedjanov, A. F. Boltabayev, E. N. Kurtaliyev, J. T. Nazarov
Scientific Journal of Samarkand University
Attenuation of acoustics waves and Grüneisen parameter has been investigated in AMG-2 and SAV-1 aluminum alloys used as a construction material in nuclear reactors. The measurements of attenuation coefficient of longitudinal acoustics waves were carried out by the echo pulse method at frequencies 10 and 30 MHz and temperature range 290 – 580 K. The maximum observed in temperature dependence of attenuation coefficient is explained by different relaxation mechanisms
Laser Spectoscopy Of Mandelstems - Brillian Scattering In Aqueous Nonelectrolyte Solutions, 2020 Samarkand State University
Laser Spectoscopy Of Mandelstems - Brillian Scattering In Aqueous Nonelectrolyte Solutions, L. M. Sabirov, D. I. Semenov, X. S. Xaydarov, F. R. Sabirov
Scientific Journal of Samarkand University
In this work we developed a method of laser spectroscopy to study the frequency shift of Mandelshtam-Brillouin components in the fine structure of Reyleigh line, which are origin due to the pressure fluctuations. The method allows to study a character of hypersound (~109 Hz)propagation in a critical region of a thermodynamic instability. Analysis of a complex of experimental material , presented in the paper, allows one to conclude that in aqueous solutions of non-electrolytes at critical concentration there is a whole structural transformations in solutions at the singular point temperature in “temperature-concentration” coordinates
Aromatic Ouroboroi: Heterocycles Involving A Sigma-Donor-Acceptor Bond And 4n+2 Pi-Electrons, 2020 University of Richmond
Aromatic Ouroboroi: Heterocycles Involving A Sigma-Donor-Acceptor Bond And 4n+2 Pi-Electrons, Kelling J. Donald, William Tiznado, Rodrigo Baez-Grez, Diego Inostroza
Chemistry Faculty Publications
The aromaticity and dynamics of a set of recently proposed neutral 5- and 6-membered heterocycles that are closed by dative (donor–acceptor) or multi-center s bonds, and have resonance forms with a Hu¨ckel number of p-electrons, are examined. The donors and acceptors in the rings include N, O, and F, and B, Be, and Mg, respectively. The planar geometry of the rings, coupled with evidence from different measures of aromaticity, namely the NICSzz, and NICSpzz components of the conventional nucleus independent chemical shifts (NICS), and ring current strengths (RCS), indicate non-trivial degrees of aromaticity in certain cases, including the cyclic C3B2OH6 …