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Articles 30841 - 30870 of 196358

Full-Text Articles in Engineering

Closing The Modern Irish Municipal Wastewater Phosphorus Cycle, Ciaran O’Donnell Jan 2023

Closing The Modern Irish Municipal Wastewater Phosphorus Cycle, Ciaran O’Donnell

Theses

Phosphorus (P) is an essential life-supporting nutrient for which there is no substitute. P naturally cycles within nature. Modern farming practice and food production have altered the natural P cycle. Successive crop harvests remove P from the soil as crops and transport them to urban areas to feed the population. To replace P removed from the soil through these crop harvests, mineral P fertilisers are applied to the soil to sustain crop production. Mineral P fertilisers are derived from finite phosphate rock. The European Union does not have an indigenous supply of phosphorus rock, which poses a significant issue for …

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Synergistic Effects Of Microplastics And Organic Foulants On The Performance Of Forward Osmosis Membranes, Mitra Golgoli, Mehdi Khiadani, Tushar Kanti Sen, Amir Razmjou, Michael L. Johns, Masoumeh Zargar Jan 2023

Synergistic Effects Of Microplastics And Organic Foulants On The Performance Of Forward Osmosis Membranes, Mitra Golgoli, Mehdi Khiadani, Tushar Kanti Sen, Amir Razmjou, Michael L. Johns, Masoumeh Zargar

Research outputs 2022 to 2026

Microplastics (MPs) are emerging contaminants that are abundantly present in the influent and effluent of wastewater treatment plants (WWTPs). Forward osmosis (FO) is an advanced treatment technology with potential applications in WWTPs. The presence of MPs in WWTP effluents can contribute to FO fouling and performance deterioration. This study focuses on FO membrane fouling by MPs of different sizes, and the interactional impacts of MPs and Humic acid (HA) (as the most common organic foulant in WWTPs) on FO membrane performance. The synergistic effect of combined MPs and HA fouling is shown to cause higher flux decline for FO membranes …

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The Glycome And Glycomedicine, Wei Wang, Baofeng Yang Jan 2023

The Glycome And Glycomedicine, Wei Wang, Baofeng Yang

Research outputs 2022 to 2026

“Life requires more than nucleic acids and proteins; sweet sugar molecules could be another life code beyond the central dogma of molecular biology.” …

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Influence Of Three-Dimensional Printing Parameters On Compressive Properties And Surface Smoothness Of Polylactic Acid Specimens, Hamed Bakhtiari, Mostafa Nikzad, Majid Tolouei-Rad Jan 2023

Influence Of Three-Dimensional Printing Parameters On Compressive Properties And Surface Smoothness Of Polylactic Acid Specimens, Hamed Bakhtiari, Mostafa Nikzad, Majid Tolouei-Rad

Research outputs 2022 to 2026

While the mechanical performance of fused filament fabrication (FFF) parts has been extensively studied in terms of the tensile and bending strength, limited research accounts for their compressive performance. This study investigates the effect of four process parameters (layer height, extrusion width, nozzle temperature, and printing speed) on the compressive properties and surface smoothness of FFF parts made of Polylactic Acid (PLA). The orthogonal Taguchi method was employed for designing the experiments. The surface roughness and compressive properties of the specimens were then measured and optimized using the analysis of variance (ANOVA). A microscopic analysis was also performed to identify …

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Lost Circulation Control During Drilling And Completion In Complex Formations, Chong Lin, Arash D. Taleghani, Chengyuan Xu, Zhenjiang You Jan 2023

Lost Circulation Control During Drilling And Completion In Complex Formations, Chong Lin, Arash D. Taleghani, Chengyuan Xu, Zhenjiang You

Research outputs 2022 to 2026

Well drilling is a common method for Earth exploration, underground mineral resource extraction, and geological storage of nuclear waste and carbon dioxide. Drilling fluid circulates in the well during drilling, cooling the drill bit, transporting rock cuttings, preventing wellbore collapse, and balancing formation pressure. Lost circulation occurs when less fluid returns from the wellbore than is pumped into it, resulting in economic losses due to drilling fluid wastage and nonproductive time. Untreated losses can cause well control issues, poor hole cleaning, pack-offs, and stuck pipe, impairing normal drilling. Lost circulation incidents are more likely to occur with the increasing share …

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Influence Of Surface Cracking, Anchor Head Profile, And Anchor Head Size On Cast-In Headed Anchors In Geopolymer Concrete, Trijon Karmokar, Alireza Moyheddin Jan 2023

Influence Of Surface Cracking, Anchor Head Profile, And Anchor Head Size On Cast-In Headed Anchors In Geopolymer Concrete, Trijon Karmokar, Alireza Moyheddin

Research outputs 2022 to 2026

In this study, the concrete cone capacity, concrete cone angle, and load–displacement response of cast-in headed anchors in geopolymer concrete are explored using numerical analyses. The concrete damaged plasticity (CDP) model in ABAQUS is used to simulate the behavior of concrete substrates. The tensile behavior of anchors in geopolymer concrete is compared with that in normal concrete as well as that predicted by the linear fracture mechanics (LFM) and concrete capacity design (CCD) models. The results show that the capacity of the anchors in geopolymer concrete is 30%–40% lower than that in normal concrete. The results also indicate that the …

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Embedded Aperture-Based Fss Sensor, Lauryn Morris, Swathi Muthyala Ramesh, Logan M. Wilcox, Doyle T. Motes, Kristen M. Donnell Jan 2023

Embedded Aperture-Based Fss Sensor, Lauryn Morris, Swathi Muthyala Ramesh, Logan M. Wilcox, Doyle T. Motes, Kristen M. Donnell

Electrical and Computer Engineering Faculty Research & Creative Works

Frequency Selective Surfaces (FSSs) Are Two-Dimensional Periodic Arrays of Electrically Conductive Elements or Apertures that Have a Specific Electromagnetic Reflection And/or Transmission Response. in This Work, an Aperture-Based Sensor Design Was Proposed that is Capable of Sensing Strain When Embedded in a Layered Dielectric Structure (I.e., an Embedded Sensor). an Aperture Approach Was Selected Due to the Potential for Operation in Reflection Mode Without a Conductive Backplane. the Sensor Was Designed to Operate within the K-Band to Improve the Potential Strain Measurement Resolution, as the Unit Cell Dimensions Are Inversely Related to the Operating Frequency and Directly Related to Strain …

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Enhancing Near-Field Wireless Localization With Lidar-Assisted Ris In Multipath Environments, Omar Rinch, Ahmed Elzanaty, Ahmad Alsharoa Jan 2023

Enhancing Near-Field Wireless Localization With Lidar-Assisted Ris In Multipath Environments, Omar Rinch, Ahmed Elzanaty, Ahmad Alsharoa

Electrical and Computer Engineering Faculty Research & Creative Works

In Next-Generation Wireless Networks that Adopt Millimeter-Waves and Large RIS, the User is Expected to Be in the Near-Field Region, Where the Widely Adopted Far-Field Algorithms based on Far-Field Can Yield Low Positioning Accuracy. Also, the Localization of UE Becomes More Challenging in Multipath Environments. in This Paper, We Propose a Localization Algorithm for a UE in the Near-Field of a RIS in Multipath Environments. the Proposed Scheme Utilizes a LiDAR to Assist the UE Positioning by Providing Geometric Information About Some of the Scatterers in the Environment. This Information is Fed to a Sparse Recovery Algorithm to Improve the …

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Experimental Verification Of Characteristic Mode Analysis (Cma) Using Reverberation Chamber, Haran Manoharan, Xu Wang, Matthew Wu, Jagan Rajagopalan, Akshay Mohan, Chulsoon Hwang Jan 2023

Experimental Verification Of Characteristic Mode Analysis (Cma) Using Reverberation Chamber, Haran Manoharan, Xu Wang, Matthew Wu, Jagan Rajagopalan, Akshay Mohan, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

In This Work, a Novel Experimental Validation of Characteristic Mode Analysis (CMA) is Proposed using Reverberation Chamber Measurements. using the Modal Weighting Coefficient Formulation based on the Magnetic Moment and Modal H Field Obtained from Solvers, the Total Radiated Power (TRP) is Calculated. This TRP is Compared with the TRP Obtained from the Reverberation Chamber Measurements. a Good Correlation between the Simulation and Measurement Was Achieved for a Simple Rectangular Plate of Size 15 Cm X 8 Cm with an Error of Less Than 4 DB.

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Application Of Tvs Models For Seed Simulation Of A Variety Of Tvs Devices, Li Shen, Yang Xu, Steffen Holland, Sergej Bub, David Pommerenke, Daryl G. Beetner Jan 2023

Application Of Tvs Models For Seed Simulation Of A Variety Of Tvs Devices, Li Shen, Yang Xu, Steffen Holland, Sergej Bub, David Pommerenke, Daryl G. Beetner

Electrical and Computer Engineering Faculty Research & Creative Works

Accurate Models of Transient Voltage Suppression (TVS) Devices Are Important for Determining the Suitability of Electrostatic Discharge (ESD) Protection Strategies Early in the Design Process. an Improved TVS Model is Used in the Following Paper to Represent a Variety of TVS Devices, Including a Snapback Device, Non-Snapback Device, and a Varistor. the Models Include Recent Improvements to Represent Conductivity Modulation and the overall Shape of the TVS Device's Transient Response. the Models Are Tuned based on Characterizations of These Protection Devices using a Transmission Line Pulse (TLP) and Are Then Used in a System Efficient ESD Design (SEED) Simulation to …

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An Analysis On The Effectiveness Of 2 And 3 Terminal Capacitors In Pdn Design, Jack Juang, Jiahuan Huang, Anfeng Huang, Kelvin Qiu, Hanfeng Wang, Yansheng Wang, Zhiping Yang, Chulsoon Hwang Jan 2023

An Analysis On The Effectiveness Of 2 And 3 Terminal Capacitors In Pdn Design, Jack Juang, Jiahuan Huang, Anfeng Huang, Kelvin Qiu, Hanfeng Wang, Yansheng Wang, Zhiping Yang, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

The Parasitic Inductance of a Capacitor Depends on its Physical Structure. Due to the Geometry of 3-Terminal Capacitors, They Boast a Lower Parasitic Inductance Compared to 2-Terminal Capacitors of the Same and Possibly Smaller Package Sizes. While the Parasitic Inductance of a Single 3-Terminal Capacitor May Be Lower, using Multiple 2-Terminal Capacitors May Result in Similar Performance. in This Work, the Inductance of 2-Terminal (0201, Nominal 2.2 UF) and 3-Terminal (0402, Nominal 4.3 UF) Capacitors is Extracted and Compared through Measurements. from Our De-Embedding Method and Characterized Capacitors, the Inductance of 2-Terminal Capacitors is Only About 20 PH Higher Than …

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Analysis On Extraction Of Potential Radiated Emission Limit Line For Data Center Equipment From 10 Ghz To 40 Ghz, Zhekun Peng, Wei Zhang, Jong Hwa Kwon, Donghyun Kim Jan 2023

Analysis On Extraction Of Potential Radiated Emission Limit Line For Data Center Equipment From 10 Ghz To 40 Ghz, Zhekun Peng, Wei Zhang, Jong Hwa Kwon, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

The Radiated Emission (RE) Potential Limit Line for Router System is Analyzed from 10 GHz to 40 GHz based on CISPR TR 16-4-4 Standard. Statistical Data is Collected for the Limit Line Extraction from Measurement, Numerical Analysis, 3D Full-Wave Simulation and Literature Studies. All the Factors Considered in Limit Line Calculation Are Analyzed for Data Center Equipment Operation. the Result of Extracted Potential Limit Line Shows the Rising Limit Line between 10 GHz and 40 GHz Frequency Band for Potential Future Radiated Emission Limit Line above 40 GHz Targeted for High-Speed Equipment Radiated Emission. This Paper is Not a Standard …

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Analysis Of Electromagnetic Interference Problems Caused By Split Reference Plane On High-Speed Multilayer Boards, Xin Fang, Chulsoon Hwang, Michelle Liu, Rodrigo Rodriguez Navarrete Jan 2023

Analysis Of Electromagnetic Interference Problems Caused By Split Reference Plane On High-Speed Multilayer Boards, Xin Fang, Chulsoon Hwang, Michelle Liu, Rodrigo Rodriguez Navarrete

Electrical and Computer Engineering Faculty Research & Creative Works

Digital/Analog Ground Partitioning Has Been Used to Isolate Noisy Digital and Power Current from Sensitive Analog Currents in High-Speed Multiplayer Printed Circuit Boards. This Design, However, Breaks the Current Return Path for Signal Traces that Cross the Two Separated Grounds, Which Causes Undesired Effects Such as Signal Distortion and Radiated Emission. Electromagnetic Mechanism Associated with Them Needs to Be Understood to Control and Suppress These Undesired Effects. in This Paper, Equivalent Circuit Diagrams Are Presented to Explain the Current Path in a Practical Camera Device with the Separated Ground. Finally, Optimal Stitching Via Locations is Determined to Provide a Good …

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On The Permittivity Of Xt-Cf20, Aaron Harmon, Wei Zhang, Victor Khilkevich Jan 2023

On The Permittivity Of Xt-Cf20, Aaron Harmon, Wei Zhang, Victor Khilkevich

Electrical and Computer Engineering Faculty Research & Creative Works

In This Work, the Permittivity of a 3D-Printed Carbon Fiber-Loaded Anisotropic Material, XT-CF20, is Examined Further. the Microstructure of XT-CF20 is First Examined Via Optical Imaging and is Shown to Be Composed of Inclusions that Are Aligned with the Print Direction of the Sample. the Permittivity Tensor for the Aligned Microstructure is Then Measured using a Capacitive Measurement Technique and Simulations Are Provided to Demonstrate the Validity of This Measurement Method. the Simulated Permittivity Values for XT-CF20 Samples with Varying Infill Structures Are Then Presented and Compared to the Measured Permittivity Values of Said Samples. an Error of Less Than …

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Continual Learning-Based Optimal Output Tracking Of Nonlinear Discrete-Time Systems With Constraints: Application To Safe Cargo Transfer, Behzad Farzanegan, S. (Sarangapani) Jagannathan Jan 2023

Continual Learning-Based Optimal Output Tracking Of Nonlinear Discrete-Time Systems With Constraints: Application To Safe Cargo Transfer, Behzad Farzanegan, S. (Sarangapani) Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Addresses a Novel Lifelong Learning (LL)-Based Optimal Output Tracking Control of Uncertain Non-Linear Affine Discrete-Time Systems (DT) with State Constraints. First, to Deal with Optimal Tracking and Reduce the Steady State Error, a Novel Augmented System, Including Tracking Error and its Integral Value and Desired Trajectory, is Proposed. to Guarantee Safety, an Asymmetric Barrier Function (BF) is Incorporated into the Utility Function to Keep the Tracking Error in a Safe Region. Then, an Adaptive Neural Network (NN) Observer is Employed to Estimate the State Vector and the Control Input Matrix of the Uncertain Nonlinear System. Next, an NN-Based …

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Reconfigurable Intelligent Surface (Ris) Design For 5g N260 Frequency Band, Reza Yazdani, Manish Kizhakkeveettil Mathew, Zhekun Peng, Donghyun Kim Jan 2023

Reconfigurable Intelligent Surface (Ris) Design For 5g N260 Frequency Band, Reza Yazdani, Manish Kizhakkeveettil Mathew, Zhekun Peng, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

In This Paper, a New Low Profile Reconfigurable Intelligent Surface Design with High Resolution Steering Reflector and Wide Frequency Band Width is Proposed at N260 Frequency Band, Used for 5G New Radio Applications. the Dynamic Reflection Phase and Tunability is Realized by Integrating of Varactor Diode with Each Unit Cell. This Study Presents Design Procedures, Reflection Simulation Verifications, and the Effects of Important Parameters on the Performance of the Proposed Novel Resonant Unit Cell. the Proposed Unit Cell Offers a Dynamic Reflection Phase Range of More Than 270° at a Wide Frequency Bandwidth. Simulation Results of Beam Steering Capability in …

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Coupling Path Analysis For Smart Speaker Intentional Electromagnetic Interference Attacks, Tanner Fokkens, Shengxuan Xia, Aaron Harmon, Chulsoon Hwang Jan 2023

Coupling Path Analysis For Smart Speaker Intentional Electromagnetic Interference Attacks, Tanner Fokkens, Shengxuan Xia, Aaron Harmon, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Shows an Improved Understanding of the Coupling Path for Intentional Electromagnetic Interference (IEMI) Attacks on Smart Speaker Devices. This Includes a Method for Finding the Ideal Attack Angle and Locating the Region Sensitive to the Coupled EMI. in Previous Works, It Was Shown to Be Possible to Send RF Commands to a Smart Speaker and Have These Commands Be Interpreted as Voice Commands by the Microphone. However, the Attack Still Had Some Limited Understanding in Terms of the Coupling Path Location and Long-Distance Attack Potential. using the Improved Understanding of the Attack, a Longer Attack Distance is Achieved …

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Extraction For Multilayer Ceramic Capacitor Vibration Induced Force, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Xin Hua, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang Jan 2023

Extraction For Multilayer Ceramic Capacitor Vibration Induced Force, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Xin Hua, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

Due to the Piezoelectric Characteristic of the MLCC Dielectric BaTiO3, the Multilayer Ceramic Capacitor (MLCC) Can Vibrate When the Supply Voltage Has AC Components. the Vibration of the MLCC Will Generate a Force on the Printed Circuit Board (PCB) It is Connected To, Causing the PCB to Vibrate as Well. the MLCC Vibration-Generated Force is Extracted using a Measurement-Simulation-Based Methodology in This Paper. the Force of an MLCC is First Extracted at the PCB Resonance Frequencies. Then, a Broadband Force Profile is Obtained by using the Interpolating Method. the Extraction Methodology Can Be Used in Different Boundary Conditions, on Different …

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Simplified Equivalent Golden Finger Port Setup For Fast And Accurate High-Speed Channel Simulation, Chaofeng Li, Kevin Cai, Mehdi Mousavi, Manish Kizhakkeveettil Mathew, Bidyut Sen, Donghyun Kim Jan 2023

Simplified Equivalent Golden Finger Port Setup For Fast And Accurate High-Speed Channel Simulation, Chaofeng Li, Kevin Cai, Mehdi Mousavi, Manish Kizhakkeveettil Mathew, Bidyut Sen, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

A Simplified Equivalent Golden Finger Port Setup is Proposed for Efficient, Accurate 3D Full-Wave Simulation for High-Speed Channels. the Bent Connector Pins, Which Mate with the Golden Finger, Are Simplified as Equivalent Cylindrical Pins to Meet the Wave Port Setting Requirements for 3D Full-Wave Simulation. the Effects of the Equivalent Cylindrical Pin Location and Diameter Are Analyzed through 3D Full-Wave Simulation. a Closed-Form Expression is Newly Proposed to Correlate the Location and Diameter of the Equivalent Cylindrical Pin with Respect to the Widely Used Bent Connector Pin. on the Basis of the Closed-Form Expression, the Bent Connector Pin Can Be …

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On Finding An Equivalent Force To Mimic The Multilayer Ceramic Capacitor Vibration, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Shengyin Ding, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang Jan 2023

On Finding An Equivalent Force To Mimic The Multilayer Ceramic Capacitor Vibration, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Shengyin Ding, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

The Multilayer Ceramic Capacitor (MLCC) Can Vibrate Due to the Piezoelectric Effect When There is AC Noise on the Power Rail. the Vibration of the Capacitor Will Generate a Force on the PCB and Thus Cause the PCB Vibration and Audible Problems May Occur. the Work in This Paper Finds an Equivalent Force with Similar Behavior to the MLCC-Generated Force. the Force is Controllable and Knowable and Thus Can Mimic the Capacitor Vibration on the PCB.

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Undesired-Resonance Analysis And Modeling Of Differential Signals Due To Narrow Ground Lines Without Stitching Vias, Chaofeng Li, Yuandong Guo, Yuanzhuo Liu, Siqi Bai, Bichen Chen, Srinivas Venkataraman, Xu Wang, Donghyun Kim Jan 2023

Undesired-Resonance Analysis And Modeling Of Differential Signals Due To Narrow Ground Lines Without Stitching Vias, Chaofeng Li, Yuandong Guo, Yuanzhuo Liu, Siqi Bai, Bichen Chen, Srinivas Venkataraman, Xu Wang, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Undesired Resonances on High-Speed Differential Signals Are Studied in This Paper, which is Caused by the Adjacent Narrow Ground Line Without Stitching Vias. Due to Space Limitations in the High-Speed Channel Layouts of Certain Package Applications, the Ground (GND) Line is Often Narrow and Has Insufficient Stitching Vias, Potentially Causing Undesired Resonance in High-Speed Differential Signals. in This Study, These Undesired Resonances Were Investigated using 3D Simulations, revealing that They Can Be Modeled as Parallel-Coupled Half-Wavelength Resonance. the Resonance Frequency of the Parallel-Coupled Half-Wavelength Resonance Structure Can Be Predicted Well using the Formula based on the GND Line Length. Moreover, …

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Challenges And Prospects Of Vehicle Ota Spherical Near-Field Measurement Probes, Dao Lin, Zhanghua Cai, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi Jan 2023

Challenges And Prospects Of Vehicle Ota Spherical Near-Field Measurement Probes, Dao Lin, Zhanghua Cai, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Discusses the Issue of Measuring Probe Indicators for Large-Scale Equipment, Such as Automobiles, under Conditions of Offset Configuration. a Simulation of Spherical Near-Field Measurement based on an Offset Configuration is Presented in This Paper. the Measurement Error is Defined According to the Reference Data Calculated by Spherical Wave Expansion Theory. through Comparative Analysis of the Simulation Results, the Main Reason for the Measurement Error is the Insufficient Coverage of the Probe's Beamwidth. by Adjusting the Probe's Radiation Pattern using Simulation Software, an Optimized Probe that Satisfies Near-Field Measurement Requirements under Meter-Level Offset Conditions is Obtained. Finally, based on …

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High-Speed Differential Via Optimization Using A High-Accuracy And High-Bandwidth Via Model, Chaofeng Li, Kevin Cai, Manish Kizhakkeveettil Mathew, Seyedmehdi Mousavi, Muqi Ouyang, Bidyut Sen, Donghyun Kim Jan 2023

High-Speed Differential Via Optimization Using A High-Accuracy And High-Bandwidth Via Model, Chaofeng Li, Kevin Cai, Manish Kizhakkeveettil Mathew, Seyedmehdi Mousavi, Muqi Ouyang, Bidyut Sen, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

A Physics-Based Equivalent Model of the High-Speed Differential Via Pair with High Accuracy and High Bandwidth is Proposed for the First Time. the Proposed Physics-Based Equivalent Circuit Model of the Differential Via Pair Includes the Effect of Adjacent Ground (GND) Vias. the Proposed Model is Verified using 3D Full-Wave Numerical Simulation Results. in Addition, the Change in Electrical Performance Due to Change in Anti-Pad Radius, the Via Pitch and the GND-Via-To-Differential-Via Distance is Analyzed. based on the Analysis, Electrical Performance of Differential Via Pair Can Be Accurately and Rapidly Optimized with Respect to Design Parameters, such as the Via Pitch, …

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Esd Behavior Of Rf Switches And Importance Of System Efficient Esd Design, Seyed Mostafa Mousavi, Emil Tauber, Amin Pak, David Pommerenke, Daryl G. Beetner, Ketan Shringarpure, Benjamin Lee, Warwick Ka Kui Wong Jan 2023

Esd Behavior Of Rf Switches And Importance Of System Efficient Esd Design, Seyed Mostafa Mousavi, Emil Tauber, Amin Pak, David Pommerenke, Daryl G. Beetner, Ketan Shringarpure, Benjamin Lee, Warwick Ka Kui Wong

Electrical and Computer Engineering Faculty Research & Creative Works

RF Switches Are Typically Used in the RF Front-End of Portable Devices Such as Antenna or Matching Tuners to Improve the RF Link Performance. They Are Usually the First Active Devices after the Antenna and Are Vulnerable to Primary or Secondary ESD Discharges to the Antennas. This Paper Investigates the ESD Behavior of One of the High Frequency Switches Used in the RF-Front-End of Portable Devices and Expresses the Importance of the ESD Pulse that Passes through the Switch and Reaches the Next Stage in the RF Path, Possibly Damaging the Next Stage.

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Coordinated System Reliability Assessment And Production Cost Simulation In Transmission Planning Of Eastern Interconnection, Xiaokang Xu, Reza Yousefian, Jie Tang, Rui Bo, John P. Buechler, Jordon Bakke, Zheng Zhou Jan 2023

Coordinated System Reliability Assessment And Production Cost Simulation In Transmission Planning Of Eastern Interconnection, Xiaokang Xu, Reza Yousefian, Jie Tang, Rui Bo, John P. Buechler, Jordon Bakke, Zheng Zhou

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a transmission need analysis for the Eastern Interconnection (EI) using a coordinated technical approach consisting of system reliability assessment (SRA) and production cost simulation (PCS). As North American Transmission Systems are being evolved with increasing levels of renewable energy resources such as wind, solar, storage, biomass, hydro, etc., maintaining grid reliability and managing transmission congestion cost are becoming increasingly challenging. It also poses complexity and challenges in technical and economic planning of the transmission grid. The coordinated SRA and PCS were conducted to assess transmission reliability and congestion for the interconnected grids of the EI in a …

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Lifelong Learning-Based Multilayer Neural Network Control Of Nonlinear Continuous-Time Strict-Feedback Systems, Irfan Ahmad Ganie, S. (Sarangapani) Jagannathan Jan 2023

Lifelong Learning-Based Multilayer Neural Network Control Of Nonlinear Continuous-Time Strict-Feedback Systems, Irfan Ahmad Ganie, S. (Sarangapani) Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

In This Paper, We Investigate Lifelong Learning (LL)-Based Tracking Control for Partially Uncertain Strict Feedback Nonlinear Systems with State Constraints, employing a Singular Value Decomposition (SVD) of the Multilayer Neural Networks (MNNs) Activation Function based Weight Tuning Scheme. the Novel SVD-Based Approach Extends the MNN Weight Tuning to (Formula Presented.) Layers. a Unique Online LL Method, based on Tracking Error, is Integrated into the MNN Weight Update Laws to Counteract Catastrophic Forgetting. to Adeptly Address Constraints for Safety Assurances, Taking into Account the Effects Caused by Disturbances, We Utilize a Time-Varying Barrier Lyapunov Function (TBLF) that Ensures a Uniformly Ultimately …

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A Statistical Shmoo For A Decision Feedback Equalizer (Dfe), Junyong Park, Donghyun Kim Jan 2023

A Statistical Shmoo For A Decision Feedback Equalizer (Dfe), Junyong Park, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

This article proposes a statistical shmoo for a Decision Feedback Equalizer (DFE). A statistical shmoo shows a Bit-Error Rate (BER) distribution of a system depending on conditions such as a threshold voltage and sampling time. The previous statistical eye diagram can be converted to a statistical shmoo except for the case of a DFE. In the shmoo, rows and columns represent different threshold voltages and sampling times, respectively. Thus, the DFE operation also depends on each row and column. Furthermore, a DFE may have error propagations because of substantial noise. Therefore, this article proposes a statistical shmoo for an ideal …

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Improved System For Measuring Contact Induced Harmonics, Rui Mi, Leonhard Petzel, Sam Bai, Seyedmostafa Mousavi, Lijuan Qu, Yiqiang Zhang, David Pommerenke Jan 2023

Improved System For Measuring Contact Induced Harmonics, Rui Mi, Leonhard Petzel, Sam Bai, Seyedmostafa Mousavi, Lijuan Qu, Yiqiang Zhang, David Pommerenke

Electrical and Computer Engineering Faculty Research & Creative Works

Portable wireless devices cannot avoid electrical contact due to assembly and maintenance requirements. In this paper, an improved test system is proposed for systematic investigation of harmonic distortion induced by metal-to-metal contacts. The system supports harmonic distortion measurements, DC resistance measurements, fine control of contact force or contraction and automatic re-mating for statistical purposes. In this regard, forward and reflected harmonic signals are measured and ultrasonic vibration is applied to cure contacts. A novel sample holder structure is designed and fabricated as a test vehicle for the measurements.

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A Combined Model For Transient And Self-Heating Of Snapback Type Esd Protection Devices, Xin Yan, Seyed Mostafa Mousavi, Li Shen, Yang Xu, Wei Zhang, Sergej Bub, Steffen Holland, David Pommerenke, Daryl G. Beetner Jan 2023

A Combined Model For Transient And Self-Heating Of Snapback Type Esd Protection Devices, Xin Yan, Seyed Mostafa Mousavi, Li Shen, Yang Xu, Wei Zhang, Sergej Bub, Steffen Holland, David Pommerenke, Daryl G. Beetner

Electrical and Computer Engineering Faculty Research & Creative Works

A simplified physics-based model for predicting the transient response and self-heating behavior of silicon-controlled rectifier (SCR) snapback-type transient voltage suppressors (TVS) is presented. Comparisons of the predicted quasi-static behavior and transient waveforms with measurements suggest that the proposed model accurately captures the most important characteristics of the device. Its simplified nature means it can be easily tuned using only data obtained from package-level measurements.

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Simulating Multi-Tapered Coaxial Baluns With An Isogeometric Surface Integral Equation Method, Maximilian Nolte, Riccardo Torchio, Sebastian Schops, Albert E. Ruehli Jan 2023

Simulating Multi-Tapered Coaxial Baluns With An Isogeometric Surface Integral Equation Method, Maximilian Nolte, Riccardo Torchio, Sebastian Schops, Albert E. Ruehli

Electrical and Computer Engineering Faculty Research & Creative Works

In this contribution we present the numerical analysis of multi-tapered coaxial baluns simulated with an Iso geometric surface integral equation method and demonstrate thereby an application of the work, which completes the studies on electrostatics conducted in [6] with the full-wave case.

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