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Articles 70351 - 70380 of 302586
Full-Text Articles in Physical Sciences and Mathematics
Repairable K/N Voting System Life Situation Model Analysis And Simulation From Time Response, Yongfeng Fang, Jianjun Chen
Repairable K/N Voting System Life Situation Model Analysis And Simulation From Time Response, Yongfeng Fang, Jianjun Chen
Journal of System Simulation
Abstract: For the k of k/n system is given according to the one's experience in the current, the probability of the failure of the singular system components was given according to the stress-strength interference theory and the load distribution of the component withstand. The dynamic reliability prediction model of the repairable k/n system was established by using probabilistic differential equations and by the repairable system components moving in reliable and failure. The equation was solved and their answers were shown to give the precisely k when the k would be determined. The model shows accuracy and feasibility …
Modeling And Simulation Of Executable Architecture Based On P-Devs, Jianpeng Hu, Linpeng Huang
Modeling And Simulation Of Executable Architecture Based On P-Devs, Jianpeng Hu, Linpeng Huang
Journal of System Simulation
Abstract: Executable architecture modeling plays a vital role in the design of complex systems and System of Systems (SoS), but there is still no common view and standard, unified execution mechanism and environment for an executable architecture. Three major elements of executable architecting were analyzed and summarized with a comparison among the options of these elements. To realize automated transformation from graphical models to executable codes, a generic modeling approach to executable architecture of SoS based on Parallel Discrete Event System Specification (P-DEVS) was proposed, and a case study of airport SoS shows its feasibility and effectiveness.
Research On Switched Current Mirror Mismatch And Simulation, Jierong Guo, Yigang He, Changqing Liu
Research On Switched Current Mirror Mismatch And Simulation, Jierong Guo, Yigang He, Changqing Liu
Journal of System Simulation
Abstract: Typical sources of switched current mirror mismatch were discussed. The most important three parameter of mismatch: transconductance, threshold voltage and the sub threshold slope were analyzed, due to the switch current circuit adopts the width to length ratio characteristic for calibration design. SPICE model using Hspice platform and 0.18 um BSIM3_V3.1 were proposed for circuit simulation. The simulation and analysis of mismatch were executed based on two kinds of operating rules of weak inversion and strong inversion. The compensation ability for mismatch was provided by floating gate switch current mirror which was also verified by simulation. Analysis and simulation …
Using Raster Lattices To Build Terrain Attribute Of Wargame Map, Jinming Zhang
Using Raster Lattices To Build Terrain Attribute Of Wargame Map, Jinming Zhang
Journal of System Simulation
Abstract: Wargame map is a sketchy description of geographical environment under certain conditions. It is used to assist commanders or operational models to locate spatial positions and to determine spatial attributes. The former process is called geometric modeling and the latter attribute modeling, and the combination of which is known as Wargame Map Modeling. A Raster Lattice Algorithm for attribute modeling was proposed, which could effectively reduce modeling complexity and improve modeling efficiency. The basic process of attribute modeling and discussing its difficulty was described, i.e., the calculation of the covered areal ratio between hexagon and the geographical environment element. …
Nonlinear H∞ Control For Marine Speed With Parameter Perturbation And Ambient Interference, Yupeng Yuan, Zhang Meng, Xinping Yan, Guo Bo, Jianglong Wan
Nonlinear H∞ Control For Marine Speed With Parameter Perturbation And Ambient Interference, Yupeng Yuan, Zhang Meng, Xinping Yan, Guo Bo, Jianglong Wan
Journal of System Simulation
Abstract: In order to improve the automation level and enhance the navigation safety of ships, stable control for ship speed is very important. Good control effect is difficult to obtain based on the conventional control method since the marine speed control system is a time-varying parameters and nonlinear complicated propulsion system. The uncertainty of the system parameters and the effect of environment such as winds, waves and currents were considered adequately in ship motion mathematical model with disturbing force. The mathematic model was linearized accurately with the differential geometry method. Then the nonlinear H∞ controller was designed according to …
State Estimation Approach By Fusing Delayed Measurements And Its Application, Pengcheng Qi, Zhonggai Zhao, Liu Fei
State Estimation Approach By Fusing Delayed Measurements And Its Application, Pengcheng Qi, Zhonggai Zhao, Liu Fei
Journal of System Simulation
Abstract: In batch processes, the key parameters were usually obtained online with low accuracy or offline with large time delay, and a state estimation algorithm was proposed to estimate the key parameters by incorporating delayed measurements with the real-time measurements. Due to the different sampling intervals of these two kinds of measurements, two cases were analyzed, including the case of only real-time measurements available and the case of both real-time and delayed measurements available. Considering the nature of nonlinearity and non-Gaussianity in batch processes, the particle filter algorithm was introduced for the state estimation, and it was further extended …
Passive Radar Simulation And Evaluation System Based On Raw Signals, Xiaofeng Ai, Yonghu Zeng, Liandong Wang, Guangyong Zheng, Xiaoyang Wang, Manxi Wang
Passive Radar Simulation And Evaluation System Based On Raw Signals, Xiaofeng Ai, Yonghu Zeng, Liandong Wang, Guangyong Zheng, Xiaoyang Wang, Manxi Wang
Journal of System Simulation
Abstract: Detection ability of the passive radar is very closely related with many factors in the real aplication. A method was proposed based on the raw data and the dynamic characteristics of a specific target. In this method, the reference and the surveillance channels' signals were obtained through the actual passive radar receiving system. The direct-path signal was reconstructed by using the reference signal. The target echo was obtained by modulating the direct-path signal with the echo power, delay and Doppler parameters, which was calculated with the move and scattering characteristics of target. Adding the target echo to surveillance channel, …
Soil Characteristics Associated With Horse Cases Of Eastern Equine Encephalitis Virus In Florida, Fulya Guzelkucuk
Soil Characteristics Associated With Horse Cases Of Eastern Equine Encephalitis Virus In Florida, Fulya Guzelkucuk
USF Tampa Graduate Theses and Dissertations
Eastern Equine Encephalitis virus (EEEV) is a mosquito-borne virus found in Florida that affects humans and horses. Also, EEEV is an agricultural land management issue in Florida, as it causes mortality in large numbers of horses each year and sometimes humans. This study investigates the characteristics of soils associated with horse cases of EEEV in the State of Florida, focusing on differences in soil characteristics between summer and winter cases. This study analyzed a total of 676 EEEV cases during 2005-2018, including 611 summer cases and 65 winter cases. Soil characteristics that were examined include: soil texture, drainage class, hydrology …
Improving The Sustainability And Mitigating Environmental Impacts Of Grazed Grassland, H. J. Di, K. C. Cameron
Improving The Sustainability And Mitigating Environmental Impacts Of Grazed Grassland, H. J. Di, K. C. Cameron
IGC Proceedings (1993-2023)
No abstract provided.
Effect Of Peat On The Soil Physical Properties, Jianyu Cui, Yajia Liu, Kangguo Mu, Xiaoqing Zhang, Lin Hu
Effect Of Peat On The Soil Physical Properties, Jianyu Cui, Yajia Liu, Kangguo Mu, Xiaoqing Zhang, Lin Hu
IGC Proceedings (1993-2023)
No abstract provided.
Effects Of Alfalfa Stand Age On Rhizosphere Soil Phosphorus In Saline Soil, Wenxing Gao, Zhiyu Zhou, Lili Zhang, Bin Ma, Gang Zhang
Effects Of Alfalfa Stand Age On Rhizosphere Soil Phosphorus In Saline Soil, Wenxing Gao, Zhiyu Zhou, Lili Zhang, Bin Ma, Gang Zhang
IGC Proceedings (1993-2023)
No abstract provided.
Elmer Fem-Dakota: A Unified Open-Source Computational Framework For Electromagnetics And Data Analytics, Anjali Sandip
Elmer Fem-Dakota: A Unified Open-Source Computational Framework For Electromagnetics And Data Analytics, Anjali Sandip
Mechanical Engineering Faculty Publications
Open-source electromagnetic design software, Elmer FEM, was interfaced with data analytics toolkit, Dakota. Furthermore, the coupled software was validated against a benchmark test. The interface developed provides a unified open-source computational framework for electromagnetics and data analytics. Its key features include uncertainty quantification, surrogate modelling and parameter studies. This framework enables a richer understanding of model predictions to better design electric machines in a time sensitive manner.
Late Quaternary Climate Variability And Change From Aotearoa New Zealand Speleothems: Progress In Age Modelling, Oxygen Isotope Master Record Construction And Proxy-Model Comparisons, Andrew M. Lorrey, Paul W. Williams, John-Mark Woolley, Nicolas C. Faushereau, Adam Hartland, Helen Bostock, Shaun Eaves, Matthew S. Lachniet, James A. Renwick, Vidya Varma
Late Quaternary Climate Variability And Change From Aotearoa New Zealand Speleothems: Progress In Age Modelling, Oxygen Isotope Master Record Construction And Proxy-Model Comparisons, Andrew M. Lorrey, Paul W. Williams, John-Mark Woolley, Nicolas C. Faushereau, Adam Hartland, Helen Bostock, Shaun Eaves, Matthew S. Lachniet, James A. Renwick, Vidya Varma
Geoscience Faculty Research
We re-evaluated speleothem isotope series from Aotearoa New Zealand that were recently contributed to the Speleothem Isotopes Synthesis and AnaLysis (SISAL) database. COnstructing Proxy Records from Age Models (COPRA) software was used to produce Bayesian age models for those speleothems. The new age modelling helped us examine Late Quaternary temporal coverage for the national speleothem network, and also supported our exploration of three different isotope master record generation techniques using Holocene δ18O data from Waitomo. We then applied the output from one of the isotope master record techniques to test an application case of how climate transfer functions can be …
Estimation Of Co-Seismic Land Deformation Due To Mw 7.3 2017 Earthquake In Iran (12 November 2017) Using Sentinel-1 Dinsar, Fatma Canaslan Çomut, Şule Gürboğa, Tayeb Smail
Estimation Of Co-Seismic Land Deformation Due To Mw 7.3 2017 Earthquake In Iran (12 November 2017) Using Sentinel-1 Dinsar, Fatma Canaslan Çomut, Şule Gürboğa, Tayeb Smail
Bulletin of the Mineral Research and Exploration
A strong shaking with Mw 7.3 occurred on 12th November 2017 around the Sarpol-e Zahab town in the border area between Iran and Iraq. It has a number of foreshocks and aftershocks increasing the total deformation, cumulatively. In this study, we have investigated how earth surface deformed after such a strong earthquake and its scatters. Because, the deformation inspection are indispensable for the safety of citizens and infrastructures. The best way for monitoring of surface deformation in such a big event is the SAR technique. This system can work effectively during night and day under different weather conditions. The Interferometric …
Effects Of Nitrogen Fertilizers On Growth And Turf Quality Of Kentucky Bluegrass, Yuling Deng, Yan Peng, Yukuan Wang
Effects Of Nitrogen Fertilizers On Growth And Turf Quality Of Kentucky Bluegrass, Yuling Deng, Yan Peng, Yukuan Wang
IGC Proceedings (1993-2023)
No abstract provided.
Change In Soil Nh4+‐N And No3- Under Different Land Use Types In The Longzhong Part Of Loess Plateau, Ding Guo, Xiaoyu Dong, Xiaodong Li, Xudong Li, Hua Fu
Change In Soil Nh4+‐N And No3- Under Different Land Use Types In The Longzhong Part Of Loess Plateau, Ding Guo, Xiaoyu Dong, Xiaodong Li, Xudong Li, Hua Fu
IGC Proceedings (1993-2023)
No abstract provided.
Litterfall Deposition Along An Altitude Gradient, Northeast Mexico, Humberto González, T. G. Domínguez, I. C. Silva, M. V. Gómez, R. G. Ramírez
Litterfall Deposition Along An Altitude Gradient, Northeast Mexico, Humberto González, T. G. Domínguez, I. C. Silva, M. V. Gómez, R. G. Ramírez
IGC Proceedings (1993-2023)
No abstract provided.
Effect Of Nitrogen Fertilisation And Cutting Frequency On The Yield And Regrowth Of Panicum Maximum Jacq In West Cameroon, E. Tedonkeng Pamo, B. Boukila, C. N. Meduke, F. Tendonkeng
Effect Of Nitrogen Fertilisation And Cutting Frequency On The Yield And Regrowth Of Panicum Maximum Jacq In West Cameroon, E. Tedonkeng Pamo, B. Boukila, C. N. Meduke, F. Tendonkeng
IGC Proceedings (1993-2023)
No abstract provided.
Sward Height Effect On Emission Of Nh3 From Broiler Manure Applied To Dactylis Glomerata L., Shabtai Bittman, A. K. Lau, D. E. Hunt, C. G. Kowalenko
Sward Height Effect On Emission Of Nh3 From Broiler Manure Applied To Dactylis Glomerata L., Shabtai Bittman, A. K. Lau, D. E. Hunt, C. G. Kowalenko
IGC Proceedings (1993-2023)
No abstract provided.
Stay Calm And Focus On The Learning Outcomes: Tools For Taking Biophysical Chemistry Online, Maria Ballester, Brian L. Van Hoozen Jr., Arthur Sikora
Stay Calm And Focus On The Learning Outcomes: Tools For Taking Biophysical Chemistry Online, Maria Ballester, Brian L. Van Hoozen Jr., Arthur Sikora
Chemistry and Physics Faculty Articles
Course specific learning outcomes are an important tool to define the scope of a course and can be very helpful when designing experiments and assessments. With slight modification, these learning outcomes can serve as a guide when transitioning to the distance learning format especially in courses with a traditional lab. Here we present such an example for the biophysical chemistry course.
Characterization Of Iron Ore And Scale For Synthesizing Vinyl Paint, Mohammed Tayeb Abedghars, Mokhtar Ghers, Salah Bouhouche, Belgacem Bezzina
Characterization Of Iron Ore And Scale For Synthesizing Vinyl Paint, Mohammed Tayeb Abedghars, Mokhtar Ghers, Salah Bouhouche, Belgacem Bezzina
Bulletin of the Mineral Research and Exploration
Two materials are studied to synthesize a vinyl painting. Iron ore is an iron pigment with an oolithic structure containing phosphorus. The second material is a steel by-product. The raw materials proprieties were studied by chemical, particle size, thermal, XRD and spectrophotometric analysis. The iron contents of the pigment and scale are respectively 53.18% and 73.83%. The grindability of scale is better than that of the pigment. The particle volume distribution is 0.7 to 32 µm for scale and 0.6 to 40 µm for pigment. TGA and DTA tests show that the pigment loses weight with phase dissolution by consuming …
X-Rays From Warped Black Hole Accretion Disks, Quincy Abarr
X-Rays From Warped Black Hole Accretion Disks, Quincy Abarr
Arts & Sciences Electronic Theses and Dissertations
In this thesis, I present the results from my research to better understand accretion onto black holes and neutron stars based on spectropolarimetric X-ray observations.
I have developed a general relativistic ray-tracing code which simulates X-rays from warped accretion disks around black holes.
I used this to predict the polarization of the thermal X-ray emission and the energy spectrum the reflected power law emission.
Both of these can be used to measure properties of black hole systems, such as the spin parameter and the inclination of the observer to its spin axis.
My results enable the measurement of these parameters …
Separating Signal From Noise In High-Density Diffuse Optical Tomography, Arefeh Sherafati
Separating Signal From Noise In High-Density Diffuse Optical Tomography, Arefeh Sherafati
Arts & Sciences Electronic Theses and Dissertations
High-density diffuse optical tomography (HD-DOT) is a relatively new neuroimaging technique that detects the changes in hemoglobin concentrations following neuronal activity through the measurement of near-infrared light intensities. Thus, it has the potential to be a surrogate for functional MRI (fMRI) as a more naturalistic, portable, and cost-effective neuroimaging system. As in other neuroimaging modalities, head motion is the most common source of noise in HD-DOT data that results in spurious effects in the functional brain images. Unlike other neuroimaging modalities, data quality assessment methods are still underdeveloped for HD-DOT. Therefore, developing robust motion detection and motion removal methods in …
First Year Students' Experience In A Cyber World Course - An Evaluation, Frank Breitinger, Ryan Tully-Doyle, Kristen Przyborski, Lauren Beck, Ronald S. Harichandran
First Year Students' Experience In A Cyber World Course - An Evaluation, Frank Breitinger, Ryan Tully-Doyle, Kristen Przyborski, Lauren Beck, Ronald S. Harichandran
Electrical & Computer Engineering and Computer Science Faculty Publications
Although cybersecurity is a major present concern, it is not a required subject in University. In response, we developed Cyber World which introduces students to eight highly important cybersecurity topics (primarily taught by none cybersecurity experts). We embedded it into our critical thinking Common Course (core curriculum) which is a team-taught first-year experience required for all students. Cyber World was first taught in Fall 2018 to a cohort of over 150 students from various majors at the University of New Haven. This article presents the evaluation of our Fall taught course. In detail, we compare the performance of Cyber World …
Biomedical Applications Of Polarimetry, Nathaniel Owen King
Biomedical Applications Of Polarimetry, Nathaniel Owen King
McKelvey School of Engineering Theses & Dissertations
Non- or minimally-invasive data collection is highly desirable for gathering the broad base of information that facilitates moving technology to the point of care. Polarimetry has been making this transition for years. Early forms of polarization-sensitive optics involved custom multiplexing a series of images to generate a single image, but today’s snapshot polarimeters are readily commercially available.
The research presented in this dissertation advances three areas of polarimetric imaging: First, this research develops a reflectance-based measurement for tracking changes in the alignment of dynamically loaded soft tissue, specifically tendon. This work highlights a range of mounting angles across which signal …
Structural Organization And Chemical Activity Revealed By New Developments In Single-Molecule Fluorescence And Orientation Imaging, Tianben Ding
McKelvey School of Engineering Theses & Dissertations
Single-molecule (SM) fluorescence and its localization are important and versatile tools for understanding and quantifying dynamical nanoscale behavior of nanoparticles and biological systems. By actively controlling the concentration of fluorescent molecules and precisely localizing individual single molecules, it is possible to overcome the classical diffraction limit and achieve 'super-resolution' with image resolution on the order of 10 nanometers.
Single molecules also can be considered as nanoscale sensors since their fluorescence changes in response to their local nanoenvironment. This dissertation discusses extending this SM approach to resolve heterogeneity and dynamics of nanoscale materials and biophysical structures by using positions and orientations …
New Physics With Ultra-High Energy Neutrinos, Yicong Sui
New Physics With Ultra-High Energy Neutrinos, Yicong Sui
Arts & Sciences Electronic Theses and Dissertations
Ultra-high energy (UHE) astrophysical neutrinos are unique in the sense that they are the
only known particles that could travel through incredibly long distance unattenuated, with
TeV to EeV energy, much higher than the most powerful man-made collider could provide.
The detection of these UHE neutrinos has ushered a new era in neutrino astrophysics, as they
carry important information directly from the inside of energetic astrophysical objects. On the
other hand, from the particle physics point of view, the UHE neutrinos also offer a new window
of opportunity for studying beyond the Standard Model (BSM) phenomena. This is the main …
Growth Of Small Particles In Nonequilibrium Plasmas, Necip Berker Üner
Growth Of Small Particles In Nonequilibrium Plasmas, Necip Berker Üner
McKelvey School of Engineering Theses & Dissertations
Nonequilibrium plasma (NEP) is an extraordinary environment for material synthesis. NEP is comprised of hot electrons with temperatures greater than 10000 K and of cold ions and neutrals that are usually at few hundred kelvins above room temperature. Due to this large difference in species’ temperatures, the assumption of local thermal equilibrium does not hold in NEP. Therefore, NEP can act as a unique processor of mass, and it can transform materials along pathways that are not accessible by methods wherein local thermal equilibrium is valid. For decades, NEPs have been employed in the semiconductor industry to manufacture many thin …
Gw190412: Observation Of A Binary-Black-Hole Coalescence With Asymmetric Masses, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, A. Aich, L. Aiello, A. Ain, P. Ajith, S. Akcay, G. Allen, A. Allocca, P. A. Altin, A. Amato, S. Anand, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Ansoldi, S. Antier, S. Appert, K. Arai, Tiffany Z. Summerscales
Gw190412: Observation Of A Binary-Black-Hole Coalescence With Asymmetric Masses, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, A. Aich, L. Aiello, A. Ain, P. Ajith, S. Akcay, G. Allen, A. Allocca, P. A. Altin, A. Amato, S. Anand, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Ansoldi, S. Antier, S. Appert, K. Arai, Tiffany Z. Summerscales
Faculty Publications
© 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGO's and Virgo's third observing run. The signal was recorded on April 12, 2019 at 05â¶30â¶44 UTC with a network signal-to-noise ratio of 19. The binary is different from observations during the first two observing runs most …
Convex Relaxations For Particle-Gradient Flow With Applications In Super-Resolution Single-Molecule Localization Microscopy, Hesam Mazidisharfabadi
Convex Relaxations For Particle-Gradient Flow With Applications In Super-Resolution Single-Molecule Localization Microscopy, Hesam Mazidisharfabadi
McKelvey School of Engineering Theses & Dissertations
Single-molecule localization microscopy (SMLM) techniques have become advanced bioanalytical tools by quantifying the positions and orientations of molecules in space and time at the nanoscale. With the noisy and heterogeneous nature of SMLM datasets in mind, we discuss leveraging particle-gradient flow 1) for quantifying the accuracy of localization algorithms with and without ground truth and 2) as a basis for novel, model-driven localization algorithms with empirically robust performance. Using experimental data, we demonstrate that overlapping images of molecules, a typical consequence of densely packed biological structures, cause biases in position estimates and reconstruction artifacts. To minimize such biases, we develop …