Online Parameter Estimation Under Non-Persistent Excitations For High-Rate Dynamic Systems, 2021 Iowa State University and Palo Alto Research Center
Online Parameter Estimation Under Non-Persistent Excitations For High-Rate Dynamic Systems, Jin Yan, Simon Laflamme, Jonathan Hong, Jacob Dodson
Civil, Construction and Environmental Engineering Publications
High-rate dynamic systems are defined as systems experiencing dynamic events of typical amplitudes higher than 100 gn for a duration of less than 100 ms. They are characterized by 1) large uncertainties on the external loads; 2) high levels of nonstationarity and heavy disturbance; and 3) generation of unmodeled dynamics from changes in mechanical configuration. To fully enable these systems, feedback capabilities must be developed. This includes computationally fast software and low latency hardware. This paper presents a pure time-based online parameter estimation algorithm for high-rate dynamic systems with real-time applicability. The algorithm is based on a model reference ...
Design And Control Of A Peristaltic Pump To Simulate Left Atrial Pressure In A Conductive Silicone Model, 2021 University of Arkansas, Fayetteville
Design And Control Of A Peristaltic Pump To Simulate Left Atrial Pressure In A Conductive Silicone Model, Jeremy Collins
Mechanical Engineering Undergraduate Honors Theses
According to the CDC, atrial fibrillation is responsible for more than 454,000 hospitalizations and approximately 158,000 deaths per year. A common treatment for atrial fibrillation is catheter ablation, a process in which a long flexible tube is guided through the femoral artery and to the source of arrhythmia in the heart, where it measures the electrical potential at various locations and converts problematic heart tissue to scar tissue via ablation. This paper details the design and control of a low-cost ($400) peristaltic pump system using repetitive control to replicate blood pressure in the left atrium in a conductive ...
Sorption Of Ions Of Some Metals On Synthesized Weakly Basic Ion Exchangers, 2021 Tashkent Chemical-Technological institute
Sorption Of Ions Of Some Metals On Synthesized Weakly Basic Ion Exchangers, Dilmurod Azimov, S. Turabjanov, Farrukh Igitov, Rano Nazirova, Tulkin Tursunov
CHEMISTRY AND CHEMICAL ENGINEERING
The purpose of the study is to test a weakly basic anion exchanger of the polycondensation type in the processes of sorption of ions of copper, nickel, cobalt, zinc, cadmium. Among the indicated metal ions, the maximum sorption was established for copper ions.
To study the process of sorption of copper ions by the tested anion exchanger, the method of potentiometric titration was used. It was found that copper ions are sorbed by the anion exchanger in the form of a complex in the range of pH = 3,4-4,2. The formation of the copper ions complexes decreases with an ...
Fabrication And Characterization Of Highly Ordered Aao Nanotubes, 2021 National University of Uzbekistan
Fabrication And Characterization Of Highly Ordered Aao Nanotubes, Anvar Khamidov, Farhod Hoshimov, Suvonkul Erkhanovich Nurmonov, Olim Ruzimuradov, Shavkat Mamatkulov
CHEMISTRY AND CHEMICAL ENGINEERING
Investigated the electrochemical synthesis and characterized of a nanometer scale porous anodic aluminum oxide (AAO) membranes with a mean pore diameter about of 80-100 nm. The anodizing process done by varying the anodizing temperature from 20 °C to 25 °C. The membranes exhibit interesting properties such as controllable pore diameters, periodicity and density distribution. These properties can preselected by adjusting the controlling parameters of a temperature controlled two-step anodization process. The surface features of the nanometer scale membrane such as pore density, pore diameter and interpore distance were quantified using scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM ...
Assessing Change In Runoff Water Parameters Through Road Shoulder Vegetated Filter Strips: Experimental Comparison Of Soils And Engineered Infiltration Media, Andrew Corrado, Mohammad Shokri
The Pegasus Review: UCF Undergraduate Research Journal
Placement of Vegetated Filter Strips (VFS) along roadways may facilitate removal of nutrients from stormwater runoff. The objective of this research is to compare water quality performance of a VFS containing engineered media to that of typical Florida sandy soil. Storms of variable intensity were simulated over two 1:1 scale physical models of typical one- and two-lane roadway shoulders, one with engineered media (treatment), and one without (control). Simulated roadway runoff was introduced as sheet flow from the roadway and precipitation was applied with a rainfall simulator. Samples of runoff and infiltrate were tested for Dissolved Oxygen (DO) concentration ...
Influence Of Parameters Of Non-Standard Modes Of Heat Treatment On Increasing The Wear Resistance Of Steel Products, 2021 ashkent state technical University, the department “Metal Forming”
Influence Of Parameters Of Non-Standard Modes Of Heat Treatment On Increasing The Wear Resistance Of Steel Products, Dorob Murotovich Berdiyev Dsn, Abdulaziz Abdullajanovich Yusupov Head Teacher, Ravshan Kobilovich Tashmatov Doctoral Student, Tuychi Nemat Ogli Ibodullayev Assistant, Kabira Erkinovna Qurbonova Head Teacher
The use of non-standard modes of heat treatment increases the density of dislocations in the crystal structure of the α-phase and increases the wear resistance of carbon, low-alloy steels under various friction conditions, which is comparable to the results when heated to a standard temperature (Ac3+30÷50 °C). The preliminary extreme heating temperature is determined. After re-quenching at standard temperature and low tempering, the wear resistance of steels under various types of friction increases by up to 40 % compared to standard quenching.
Monitoring Impact Damage In Composites With Large Area Sensing Skins, 2021 University of South Carolina
Monitoring Impact Damage In Composites With Large Area Sensing Skins, Alexander B. Vereen, Austin Downey, Subramani Sockalingham, Paul Ziehl, Simon Laflamme, Jian Li, Hongki Jo
Civil, Construction and Environmental Engineering Conference Presentations and Proceedings
The effect of low energy impacts can seriously impair the operational life span of composites in the field. These low-energy impacts can induce a permanent loss in the toughness of the composite without any visible indication of the material’s compromise. The detection of this damage utilizing nondestructive inspection requires dense measurements over much of the surface and has been traditionally achieved by removing the part from service for advanced imaging techniques. While these methods can accurately diagnose the damage inflicted internally by the impacts, they accrue non-trivial opportunity costs while the structure is inspected. To enable the capabilities of ...
Chemin De Fer De Marseille Au Rhone, 2021 Livre de Lyon
Chemin De Fer De Marseille Au Rhone, Conseil Municipal D'Arles
No abstract provided.
La Quistione Del Passaggio Delle Alpi Elvetiche Con Una Ferrovia, 2021 Livre de Lyon
La Quistione Del Passaggio Delle Alpi Elvetiche Con Una Ferrovia, Milano Editori Del Politecnico
No abstract provided.
Me-Em Enewsbrief, March 2021, 2021 Michigan Technological University
Me-Em Enewsbrief, March 2021, Department Of Mechanical Engineering-Engineering Mechanics, Michigan Technological University
Department of Mechanical Engineering-Engineering Mechanics eNewsBrief
No abstract provided.
How To Cleave Wafers: Latticegear Protocol, 2021 Singh Center for Nanotechnology
How To Cleave Wafers: Latticegear Protocol, Shenshen Wan, George Patrick Watson
Protocols and Reports
We report on the process protocol to cleave wafers using LatticeGear cleaving and scribing tools sets.
Fingering Behavior Of Flame Spread Over Solid Combustibles, 2021 Toyohashi University of Technology
Fingering Behavior Of Flame Spread Over Solid Combustibles, Tsuneyoshi Matsuoka, Kentaro Nakashima, Takuma Kajimoto, Akihiro Yoshimasa, Yuji Nakamura
Progress in Scale Modeling, an International Journal
In this study, the fingering pattern formation and the following flamelet spreading over three different kinds of thick combustibles, i.e., Poly methacrylate (PMMA), Poly ethylene (PE) and Poly carbonate (PC) were observed and the effective Lewis number correlation was validated. Experiments were performed with a narrow channel apparatus. In addition to the kinds of solid fuel materials, the channel height and the oxidizer velocity were varied as experimental parameters. An image analysis method was developed to quantify the number, diameter and spread rate of the flamelets. Replacing the fuel thickness into the thermal thickness, the effective Lewis number which ...
A Single-Stage Passive Vibration Isolation System For Scanning Tunneling Microscopy, 2021 California Polytechnic State University, San Luis Obispo
A Single-Stage Passive Vibration Isolation System For Scanning Tunneling Microscopy, Toan T. Le
Scanning Tunneling Microscopy (STM) uses quantum tunneling effect to study the surfaces of materials on an atomic scale. Since the probe of the microscope is on the order of nanometers away from the surface, the device is prone to noises due to vibrations from the surroundings. To minimize the random noises and floor vibrations, passive vibration isolation is a commonly used technique due to its low cost and simpler design compared to active vibration isolation, especially when the entire vibration isolation system (VIS) stays inside an Ultra High Vacuum (UHV) environment. This research aims to analyze and build a single-stage ...
Optimization Of Bilayer Lift-Off Process To Enable The Gap Size Of 1Μm Using Lor 3a And S1813, 2021 Singh Center for Nanotechnology
Optimization Of Bilayer Lift-Off Process To Enable The Gap Size Of 1Μm Using Lor 3a And S1813, Yeonjoon Suh, George Patrick Watson
Protocols and Reports
Bilayer lift-off process for 1μm feature size is demonstrated using LOR 3A and S1813 photoresist. The thickness of photoresists was fixed, whereas development time is varied. The process was further investigated by measuring the undercut depth and undercut rate by scanning electron microscopy. An optimized and reproducible recipe is provided.
Optimal Nonlinear Pid Speed Control Based On Harmony Search For An Electric Vehicle, 2021 Future University in Egypt
Optimal Nonlinear Pid Speed Control Based On Harmony Search For An Electric Vehicle, Mohamed Shamseldin, Mohamed Abdel Ghany, Yahia Hendawey
Future Engineering Journal
the paper presents an efficient scheme for a Nonlinear PID (NPID) controller to improve the dynamic response of the Electric Vehicle (EV). The objective of the proposed controller is to track accurately the reference speed selected by the driver of the EV. A MATLAB/Simulink model is established and validated for the considered EV to study the system performance. The proposed NPID controller has been investigated by comparing it with the traditional PID controller. The optimal parameters of Both the NPID and PID controllers were obtained using the Harmony Search (HS) optimization technique based on a cost function. The desired ...
Research Trend Of Metal Matrix Composites Reinforced With Silica Extracted By Green Route: A Bibliometric Analysis, 2021 Symbiosis Institute of Technology (SIT), Symbiosis International (Deemed University) (SIU), Lavale, Pune, India
Research Trend Of Metal Matrix Composites Reinforced With Silica Extracted By Green Route: A Bibliometric Analysis, Rinku Datkhile, Meena Laad, Babaji Ghule
Library Philosophy and Practice (e-journal)
Metal Matrix Composites have acquired an important place in the engineering applications due to their distinctive characteristics such as high specific strength, lower specific gravity, improved material stiffness, better durability, enhanced creep and fatigue strength etc. Worldwide scientists are working on the improvement of mechanical properties of composite materials. The present work attempts to summarise all the research carried out on metal matrix composites reinforced with silica extracted by green route and provides up-to-date research material for researchers who are interested in the field of composites with metal matrices. Scopus databases and software such as Gephi Vos Viewer and Table2Net ...
A Typology For Magnetic Field Generator Technologies, 2021 Iowa State University
A Typology For Magnetic Field Generator Technologies, N. Robert Y. Bouda, N. Prabhu Gaunkar, W. Shen Theh, Mani Mina
Industrial Design Publications
This paper identifies different methodologies used to design suitable magnetic field generators (MFG) with adjustable characteristics. Variations in parameters, such as pulse frequency and amplitude elicit distinct responses. Assessing the differences between design parameters and experimental observations of magnetic field generators is essential for various applications. The use of magnetic field generator-based techniques is first studied in applications related to optical transmission, transcranial magnetic stimulation devices and magnetic resonance. Decades of research and technological advancement are associated with these methods. The associated nomenclature for describing and characterizing these methods are introduced and discussed. Finally, the paper presents possible future framework ...
Quantifying Shape Of Star-Like Objects Using Shape Curves And A New Compactness Measure, 2021 University of New Hampshire, Durham
Quantifying Shape Of Star-Like Objects Using Shape Curves And A New Compactness Measure, Gopal K. Mulukutla, Emese Hadnagy, Matthew Fearon, Edward Garboczi
Earth Systems Research Center
Shape is an important indicator of the physical and chemical behavior of natural and engineered particulate materials (e.g., sediment, sand, rock, volcanic ash). It directly or indirectly affects numerous microscopic and macroscopic geologic, environmental and engineering processes. Due to the complex, highly irregular shapes found in particulate materials, there is a perennial need for quantitative shape descriptions. We developed a new characterization method (shape curve analysis) and a new quantitative measure (compactness, not the topological mathematical definition) by applying a fundamental principle that the geometric anisotropy of an object is a unique signature of its internal spatial distribution ...
Nondestructive Evaluation Of Aluminium Foam Panels Subjected To Impact Loading, 2021 University of Messina
Nondestructive Evaluation Of Aluminium Foam Panels Subjected To Impact Loading, Gabriella Epasto, Fabio Distefano, Hozhabar Mozafari, Emanoil Linul, Vincenzo Crupi
Mechanical & Materials Engineering Faculty Publications
Aluminium foam sandwich structures have excellent energy absorption capacity, combined with good mechanical properties and low density. Some of the authors of this paper proposed an innovative Metallic Foam Shell protective device against flying ballast impact damage in railway axles. A closed-cell aluminium foam was chosen for the Metallic Foam Shell device. The main goal of this study was the experimental investigation of the impact responses of aluminium foam panels. Low velocity impact tests were carried out at different energies on different types of aluminium foam panels in order to investigate the effects of some parameters, such as core thickness ...
Metallic Surface Doping Of Metal Halide Perovskites, 2021 University of North Carolina
Metallic Surface Doping Of Metal Halide Perovskites, Yuze Lin, Yuchuan Shao, Jun Dai, Tao Li, Yi Liu, Xuezeng Dai, Xun Xiao, Yehao Deng, Alexei Gruverman, Xiao Cheng Zeng, Jinsong Huang
Mechanical & Materials Engineering Faculty Publications
Intentional doping is the core of semiconductor technologies to tune electrical and optical properties of semiconductors for electronic devices, however, it has shown to be a grand challenge for halide perovskites. Here, we show that some metal ions, such as silver, strontium, cerium ions, which exist in the precursors of halide perovskites as impurities, can n-dope the surface of perovskites from being intrinsic to metallic. The low solubility of these ions in halide perovskite crystals excludes the metal impurities to perovskite surfaces, leaving the interior of perovskite crystals intrinsic. Computation shows these metal ions introduce many electronic states close to ...