Digital Commons Network^™

Nepantla: The Space In-Between, Samantha Shamard

All Theses

The word Nepantla is from the Mesoamerican Nahuatl language and is used by theorist Gloria Anzaldúa to describe a space of mixed, and borderland identity. Nepantla: the space in-between creates a physical manifestation of my experience as a mixed Latina woman raised in American suburban culture. This series is made up of ceramic objects on wall-mounted altars made of wood panels adorned with wallpaper and paint. The surfaces utilize visual references and color schemes from 90s girls’ bedrooms and Mexican pop-culture. Ceramic bones and cacti mounted onto the altar forms are all made through molded ceramic processes, which for me …

Multilingualism And Memory: Investigating Possible Differences In The Abilities Of Monolingual And Multilingual College Students, Clara E. Barned

Honors Projects

This study investigated whether there is a difference in the memories of monolingual and multilingual undergraduate students using simple memorization tasks. There were 46 participants, 30 of which were monolingual (only knew one language) and 16 of which were multilingual (knew two or more languages). There was found to be no significant difference between the performance of the two groups, with the data generating a p-value of 0.557. This study further suggests related avenues of research and ways in which the study could be improved in the future.

Cultivating Music Educators For Engaging In Varied Pedagogy Within An Increasingly Pluralistic Society, Maggie Brown

Honors Projects

As society continues to grow increasingly pluralistic, questions arise concerning how to better prepare preservice educators in teacher preparation programs. The purpose of this study was to determine the connections between P12 teachers’ training, experience, and what is being done in the classroom. Three participants were hand-selected for participation due to their proven track record employing varied curricular practice. The participants represented a varied range of areas of expertise and years of experience. After exploring the experiences of these three teachers, themes of (1) getting outside of one’s comfort zone, (2) engaging in musical amateurism, and (3) synergizing traditional and …

If You Give A Beetle A Maple: Anoplophora Glabripennis Habitat Selection Patterns On An Island In South Carolina, Meredith Bean

All Theses

At the epicenter of the Asian longhorned beetle (Anoplophora glabripennis Motschulsky) quarantine zone in South Carolina, a small island containing an actively growing subpopulation of A. glabripennis had not completely killed its 37 host trees in 2020. Before these trees were removed and destroyed according to the USDA Eradication Program protocols, I performed an observational study to examine the microhabitat selection tendencies of the invasive A. glabripennis within this satellite infestation. After cataloging >14,000 oviposition sites and >1,600 exit holes created by A. glabripennis, I found dispersal trends according to a host’s stem status (single or multi-stemmed), vertical …

An Evaluation Of Bovine Reproductive Function From The Microrna Expression In The Female To Performance Testing In The Male, Erin Amiss

All Theses

Reproductive function is crucial to the success of a beef or dairy herd. Both the female and male play significant roles in the outcome of bovine reproduction. The bull contributes to reproductive success in many ways, such as genetics. The initial role that the bull has in reproductive success is fertilization, whether natural or by artificial insemination. One method of assessing bull performance are central bull test stations, which are traditionally administered by a university, extension center, or are privately owned. Central bull tests assess the performance of bulls from various management systems, breeds, and ages. Some measurements taken during …

Reducing Physical Restraints And Emergency Psychiatric Medications On An Inpatient Psychiatric Unit With The Broset Violence Checklist, Victoria Hernandez

Doctor of Nursing Practice

Background: Physical restraint and psychiatric emergency medication use, especially psychotropic medications, is problematic, negatively impacting patient safety on psychiatric units (Ambwani et al., 2021; Iuppa et al., 2013; Rahman, 2021). The Bröset Violence Checklist (Woods & Almvik, 2002), a short-term violence-predicting tool, has been used in the inpatient setting to predict violent outbursts and determine when high-level violence interventions are needed.

Purpose: The purpose of this project was to recognize signs and symptoms of aggression and agitation early and intervene to reduce the use of physical restraints and emergency restraint medications on an inpatient psychiatric unit, thereby improving patient safety. …

Optogenetic Heart Pacing And Heart Arrest In Drosophila Melanogaster Using Integrated Ocm Imaging And Light Stimulation System, Yuxuan Wang

McKelvey School of Engineering Graduate Student Theses & Dissertations

Optogenetics has been widely applied to cardiovascular research using different models. Among them, Drosophila melanogaster (fruit fly) outstands for its similarity of human genes for disease modeling and short life cycle for rapid screening to analyze genetic mechanisms of heart disease. However, most of the current models only allow either activation or inhibition of the heartbeat, which is not sufficient to model complex arrhythmia. Our lab developed a novel Drosophila transgenic model based on a double transgenic line containing two light-sensitive genes, Channelrhodopsin-2 (ChR2) and Halorhodopsin2.0 (NpHR2.0), that enable dual-directional control of the heartbeat rhythm. Real-time optical control of the …

A Fault Section Location Method Of Distribution Networks Based On Hausdorff Distance Algorithm, Tianxi Huang, Bin Li, Wunen Liu, Changbin Luo, Jumei Jiang, Shanming Wan

Journal of Electric Power Science and Technology

In order to cope with the difficulty in locating the fault section when single-phase-to-ground fault occurs in the small current grounding system of a distribution network, this paper proposes a fault section location method based on the Hausdorff Distance algorithm according to the characteristics that the zero sequence currents on both sides of the fault point are opposite in the fault line. In this method, the zero sequence current is selected as the fault feature firstly, and is then filtered to ensure the wavelet approximate sequence of the zero sequence current of each detection node of the fault feeder can …

Modeling And Stability Analysis Of Single Phase Voltage Source Converter Rectifier Based On Harmonic Transfer Function, Dongqiang Jia, Wenjun Liu, Hongchuan Li, Wanfang Xiao, Bin Li, Xiangyang Xia, Yunfeng Li

Journal of Electric Power Science and Technology

Single phase VSC has a wide range of applications, and studying its operating characteristics is of great significance for harmonic generation mechanism, harmonic suppression and stability improvement. Firstly, the second-order generalized integrator is used to construct the synchronous phase-locked loop for the main circuit structure of single-phase VSC rectifier. Secondly, according to the requirements of DC voltage outer loop control and unit power factor operation, the equation of inner current control loop is established using the quasi-proportional-resonant controller. Thirdly, based on the linearization principle of the running trajectory of the time-varying period system, the harmonic transfer function matrix of the …

Assessment Of Distribution Line Zero-Sequence Overcurrent Protection Inrush Maloperation Risk And Corresponding Countermeasure With 5g, Ye Peng, Zhen Jin, Hongshan Chen, Shu Xu, Changbing Luo, Wei Hou, Jinfeng He, Jun Chen

Journal of Electric Power Science and Technology

The high zero-sequence inrush will be caused when the high-voltage built-in high-impedance transformer performs no-load closing, which may penetrate into the 20 kV distribution network with a grounding small resistance through the adjacent transformers, leading to the maloperation of zero-sequence overcurrent protection of distribution lines. This will result in the power loss of users. To solve this, the amplitude characteristics of high-voltage built-in high-impedance transformers are analyzed based on zero-sequence inrush formula. Then, the validity of the model and the possibility of protection maloperation are studied based on PSCAD/EMTDC simulation platform. At last, the calculation procedure for assessing risks of …

Accurate Measurement Method Of Distribution Network-To-Ground Capacitance Based On Graded Adjustment Of Grounding Transformer Windings, Lifang Wu, Hao Bai, Jianna Ouyang, Zhiyong Yuan, Shan Li

Journal of Electric Power Science and Technology

The traditional measurement method of distribution network grounding capacitance is greatly affected by the neutral grounding mode, and cannot eliminate the influence of harmonic elimination resistance and internal impedance of voltage transformer on the measurement accuracy. For this reason, an accurate measurement method of distribution network grounding capacitance that is not affected by the neutral point grounding mode is proposed. By using the Y/△ connection grounding transformer with tap connected externally to the distribution network, the zero sequence voltage of the distribution network is ensured to change within the specified offset value by adjusting the grounding tap of the high …

Regional-Joint Peak-Load Shifting Strategy Based On The Aggregated Systems Of Sharing Phase Change Material Energy Storage, Chao Zhang, Changjie Jia, Wenjun He, Taijun Zhong, Zhongnan Feng

Journal of Electric Power Science and Technology

As a distributed energy storage with high flexibility, high reliability, and a green economy, the energy storage system with phase change materials can provide flexible and reliable auxiliary services for the grid as a kind of adjustable load. For the purpose of further investigating the application potential of distributed energy storage systems with phase change material, a kind of regional-joint peak-load shifting strategy is presented based on the aggregated system with shared phase change energy storage. Firstly, an aggregated controllable model for units of distributed phase change material energy storage is proposed. After that, a feasible regional-joint control architecture based …

Research On Distribution Network Planning Optimization Based Onurban Energy Internet, Shimin Rong, Cong Wang, Chunguang He, Huiqing Ma, Tao Wang

Journal of Electric Power Science and Technology

The traditional distribution network planning method ignores of the power difference before and after the distributed generation is connected to the distribution network, which leads to a high construction cost. Therefore, a distribution network planning optimization method is proposed on the basis of the urban energy internet. Firstly, the power of the distributed generator is calculated before and after it is connected to the distribution network. And then, the load changes are compared in terms of the power change, so as to determine the influencing factors of the urban energy internet on the distribution network. Based on these influencing factors, …

Analysis Of "2·15" Blackout In Texas And Its Enlightenment To China's New Power System Supply Adequacy, Zhengqi Li, Ye Cai, Yijia Cao, Long Li, Yudong Tan

Journal of Electric Power Science and Technology

With the fast development of the economy and society, the reliable supply of electricity has triggered a wide range of concerns. On 15th, February, 2021, a large-scale power outage occurred in Texas, USA due to the extremely cold weather. More than 4.8 million users are affected. This accident has a serious impact on industrial production and people's lives. Firstly, the general situation of the power system in Texas is briefly introduced, and then the specific process of the blackout is described in chronological order. After that, the causes of the blackout event are analyzed from three aspects: grid adequacy, regional …

Risk Analysis Of Power System Cyber Security Considering Identity Of Malicious Adversaries, Ruiqing Shan, Yang Sheng, Sheng Su, Guanghui Chang, Xiangshuo Li, Gaichao Xue, Chong Ruan, Po Wu, Jiangnan Zhang

Journal of Electric Power Science and Technology

The ever-increasing coupling relationship between cyber and physical systems makes cyber-attacks become an important factor affecting the reliability of power system operations. First, this article conducts the analysis of the network security risk from the attacker’s perspective, infers the available resources of the attacker based on the identity of the attacker, analyzes the purpose of the attack to be achieved, and infers the possible penetration and intrusion path and damage modes. The guidance can be provided to develop the specific protection methods based on the above analysis. Then this paper analyzes the deficiencies of the trusted computing, hierarchical protection, security …

Hybrid State Estimation Method For Electric-Thermal Integrated Energy Systems, Xinhe Zhang, Guixiong He, Kecheng Li, Ming Zhong, Kaicheng Liu

Journal of Electric Power Science and Technology

Integrated Energy System (IES) covers a variety of energy such as electricity, heat and gas, which have complex operating states and diverse dynamic characteristics of the equipment. Accurate state estimation (SE) helps IES operate safely and reliably. In this case, a method is proposed for IES mixed state estimation regarding to the poor timeliness and accuracy of IES estimation. Firstly, the influence of the coupling measurement model on the redundancy of IES measurement is analyzed, and the effect of heat network state estimation is improved according to the variation of redundancy. Then, the distributed state estimation is introduced into IES …

The Decision-Making Method Of Orderly Power Consumption Based On Variable Weights Given By The Entropy Weight-Grey Relation, Xiafei Tang, Xufeng Yin, Louzhi Liu, Xuan Pan, Xueqin Li, Xueying Peng

Journal of Electric Power Science and Technology

Nowadays, the contradiction in the seasonal and periodic power supply and demand is gradually dominant. The orderly use of electricity via avoiding peak and shifting peak can alleviate the contradiction, delay the construction of transmission and distribution facilities and confirm the safe operation of the power system. Under the background, a decision-making method of orderly Power consumption is proposed with weight given by the entropy weight-grey relation. Firstly, since the constant weight is insensitive to abnormal indicators, the information entropy is combined with the grey correlation degree to decide the weight. After that, the potential is comprehensively evaluated for users …

A Data Augmentation Method For Distributed Photovoltaic Electricity Theft Using Generative Adversarial Network, Jingge Li, Na Rong, Qingchao Chen

Journal of Electric Power Science and Technology

Due to the difficulty of the inspection of distributed photovoltaic (PV) electricity theft, the number of electricity theft samples collected by relevant departments is limited, which cannot meet the needs of data-driven electricity theft detection. This paper proposes a data augmentation method for distributed PV electricity theft using Wasserstein generative adversarial network (WGAN). First, WGAN can explicitly learn the time correlation that is difficult to model in the PV electricity theft data sequence. Furthermore, it can generate new electricity theft samples with similar distributions to the real ones through the confrontation training of the generator and discriminator networks. Then, according …

Fault Detection Method Of Transformer Winding Based On Combined Algorithm Of Ultrasonic Synthetic Aperture Arc Scanning, Nan Zhou, Cuan Wang, Hailong Yang

Journal of Electric Power Science and Technology

In order to solve the problem that the resolution of the transformer windings ultrasonic detection system decreases with the increasing detection distance, this paper proposes a combined algorithm of ultrasonic synthetic aperture arc scanning, so that the resolution of the detection system is only related to the transducer itself. By applying the proposed method, faults can be quickly located, thus detection efficiency and detection accuracy are improved. Finally, a transformer winding ultrasonic synthetic aperture detection system is designed in this paper, and a 400 kHz ultrasonic transducer is used to conduct experiments on a transformer. The final experimental results show …

Detection Method Of Terminal Number Of Secondary Circuit Based On East, Xingyuan Wang, Chunyu Wang, Zhi Li, Jinquan Zhao

Journal of Electric Power Science and Technology

The field inspection of the secondary circuit is an important step in the field inspection of the gateway electrical energy metering device. However, the method of finding a secondary circuit terminal to be tested was rather complicated in the past. In order to optimize the process of finding terminals to be tested, this paper proposes a terminal number detection method based on EAST. In this method, the training dataset is first established, and the EAST model is trained. The trained model is used to detect the text in the terminal block image and outputs the size and position information of …

Terminal Temperature Detection Method For Smart Meter Based On Rbf Neural Network Optimized By Improved Pso, Youjie Fan, Xiangdong Deng, Yunpeng Gao, Zhenhua Tang, Junjian Zhu, Liang Zhu

Journal of Electric Power Science and Technology

Aiming at the problem that it is difficult to directly detect the temperature of the front-end terminal of the smart meter, this paper proposes an improved particle swarm optimization radial basis function neural network for the detection of the temperature terminal of the smart meter. First, the mapping relationship between the terminal temperature of the electric energy meter and its influencing factors based on the RBF neural network is established. The central position of the appropriate network core function is selected through the K-Means++ algorithm, and the recursive least square method is used to obtain the network core function connection …

Apwm Control Strategy Of Fixed Frequency Llc Resonant Converter For Wide Voltage Applications, Jian Pan, Songlin Liu, Di Shi, Haojie Song, Jiaxin Xiong

Journal of Electric Power Science and Technology

The conventional frequency-controlled LLC resonant converter suffers from wide frequency regulation range and low conversion efficiency, so that it is unsuitable for wide voltage range applications with a wide voltage range. In order to solve these problems, a PWM control strategy of the full-bridge LLC resonant converter is proposed in this paper, which realizes the gain adjustment by adjusting the duty cycle of the switch The switches of two lower arms of the resonant converter are controlled by a fixed frequency, and the switching frequency is equal to the resonant frequency, while the switches of the two upper arms are …

Double-Deck Planning Model Of Integrated Energy System In Consideration Of Dynamic Load Energy Storage Strategy, Mingzhe Jiang, Guixue Cheng, Jinbin Zhao

Journal of Electric Power Science and Technology

Most of the existing planning strategies for the electricity gas-heat-integrated energy system are realized by cutting or transferring the load, and the influence of the dynamic coupling process is not considered. Therefore, the scheduling is not flexible enough. Under the background, a two-layer optimal scheduling model that considers the Dynamic Energy Conversion (DEC) energy storage and loads collaborative optimization strategy is proposed in this paper. In the upper layer, the dynamic conversion of energy flow is considered and the whole life cycle impact of the electric facilities, such as batteries, super-capacitors, and electricity to gas, is also concerned. Then the …

Line Loss Allocation Method Considering The Dg Influence Level Division And Weight Characteristics, Han Wu, Yangsen Ou, Weitian Cheng, Zhen Zhang

Journal of Electric Power Science and Technology

In view of the current situation that the existing line loss allocation methods do not reasonably consider the actual impact of distributed generator (DG) grid connection on the line loss of distribution network, this paper proposes a line loss allocation method which takes into account DG impact levels and weight characteristics. Firstly, a set of impact index system is designed in terms of the planning, operation and management of distribution network so as to comprehensively characterize the impact of DG grid connection on distribution network. On this basis, the line loss allocation strategy is developed to deduce the economic cost …

Research On A New Fault Location Method For Cable Considering Metal Sheath Structure, Jun Zhang, Nenhong Xia, Jie Wang, Zhipeng Yuan

Journal of Electric Power Science and Technology

Many faults of single core cables are related to metal sheath. The simplified model that only considers the core cannot realize the sheath-related fault location. This paper proposes a novel fault location method considering the metal sheath of the cable basing on the distributed parameter model. First, based on the distribution parameter theory, the equivalent distribution parameter circuit of the fault cable of considering the metal sheath is analyzed, the voltage and current equations are established; then, the unknown parameters in the voltage and current equations are solved through boundary conditions, the voltage and the current value of both sides …

A Value Evaluation Method Of Power User Based On Ahp And Bp-Adaboost Algorithms, Jiran Zhu, Di Zhang, Zhidan Zhang, Tao Peng, Jinliang You, Xiaowei Tang, Rui Ma

Journal of Electric Power Science and Technology

The traditional value evaluation of power users does not consider the high and low voltage levels generally. In fact, the applicable indicators of high voltage and low voltage users are different, especially, there is no corresponding indicator system for the current low voltage power user value evaluation. Therefore, this paper proposes a low voltage power user value evaluation method based on the AHP and BP Adaboost algorithms. Firstly, a set of low-voltage power user value evaluation index systems are established, and the scoring rules and grading rules are defined. Then the comprehensive scores and grades of low-voltage power user value …

Ultra-Short-Term Power Prediction Method Of Distribution Network Based On Improved Recurrent Neural Network, Zhenbing Zhao, Yifan Qiang, Xin Li, Na Xiao, Jian Li, Yanna Xi, Ying Shi

Journal of Electric Power Science and Technology

The traditional one-directional neural network has some problems in the field of ultra-short-term power prediction in distribution networks, such as the out-of-shape curve prediction, the over-fitting phenomenon of the model, low prediction accuracy and slow convergence speed, etc. Thus, an improved bi-directional recurrent neural network model is proposed based on the wavelet transform and self-attention mechanism to overcome these problems. Firstly, the forward and reverse laws of the power data are studied by the bi-directional network to improve the prediction accuracy of the model. Afterward, the wavelet transform is employed to reduce the overall difficulty of power prediction. Consequently, the …

Simulation Research On Impulse Characteristics Of Pole Tower Grounding Device In Double Layer Soil Based On Atp-Draw, Lixing Zhou, Lizhi Luo, Yubin Liu, Hong Su, Jinqi Liu, Yuwen Deng

Journal of Electric Power Science and Technology

In order to study the influence of layered soil on the impulse current dispersing characteristics of grounding device. This paper proposes a simulation method for the impulse characteristics of the double-layer soil tower grounding device based on ATP-Draw. By using the Laplace method, the grounding resistance of the horizontal grounding body and the vertical grounding body in the double-layer soil are calculated. The conductivity parameters, capacitance parameters, and inductance parameters of each part of the chain circuit model of the grounding device under the double-layer soil structure are obtained. ATP-Draw simulation model of pole grounding device in complex soil is …

Container-Based Microservice Modeling And Computing Resource Scheduling Method For Distribution Network Protection, Zhichao Lin, Hongmei Zhong, Yuanqing Wei, Guiling Zhang

Journal of Electric Power Science and Technology

With the development of intelligent distribution networks, the type and quantity of equipment in distribution networks show the trend of massive access. The explosive growth of heterogeneous and multi-source data information also puts forward higher requirements for the real-time and reliability of intelligent distribution network protection business. In order to better meet the delay requirements of distribution network protection services, this paper proposes a container-based distribution network protection microservice modeling and computing resource scheduling method. Firstly, the distribution network protection service is decomposed into multiple microservices, and the microservice timing logic model of the distribution network protection service and the …

Acpid Control Method Of Unmatched Nonlinear Systems, Dan Huang, Huiqing Xu, Lei Zhuang, Zhao Zeng

Journal of Electric Power Science and Technology

The unmatched disturbance is a common disturbance type in practical engineering problems, and traditional control methods are difficult to achieve ideal control performance. Under the background, a control method based on auto-coupling PID(Auto-Coupling Proportional-Integral-Differential, ACPID) control theory is utilized to solve the control problem of a class of nonlinear systems with non-matching disturbances. Firstly, the external disturbances and internal state of this method in the unmatched channel are defined as new unknown states. Meanwhile, the internal dynamics and external disturbances are defined as total disturbances. Then, the system can be transferred to an equivalent unknown linear system. After that, a …