Engineering Commons^™

Stability Of Excavation Face Of Double‑Mode Shield In Earth Pressure Mode Crossing Fault Zone Of Pearl River, Tong Bin, Zhang Bin, Zhu Hanbiao, Wang Shuying

Journal of China & Foreign Highway

In view of the stability of the excavation face of the double-mode shield crossing the fault zone of the Pearl River，the project of the section from Hongshengsha Station to Yufengwei Station of the second phase of Guangzhou Metro Line Seven was studied.Through numerical simulations conducted to analyze the whole area and the local high-risk area of the shield crossing the fault zone of the Pearl River，this paper explored the construction risk of the shield crossing process.Besides，this paper analyzed the influence of different support stresses and grouting pressures on the stability of the excavation face and ground deformation，and finally，the tunneling parameters …

Development Trend On Raw Materials Market Of Ready‑Mixed Concrete Under Green Construction, Ding Hu, Ding Qingjun, Lin Haojun, Zhang Zhen

Journal of China & Foreign Highway

In the face of resource depletion，high energy consumption in production，high carbon emissions，and serious pollution brought by traditional pumpcrete raw materials，a variety of new raw materials have been gradually developed and promoted to conform with the green construction promoted by China ’s civil engineering industry，witnessing a stable increase in quality，output，and social recognition.High-quality natural river sand and pebbles are in short supply at the origin，and they can be explored in old silted river channels.Gravel and manufactured sand produced using large particle size natural pebbles，limestone，construction waste，and others as raw materials will become new substitutes.In the transformation and upgrading of production enterprises which tend …

10.28.2024 Orsp Connect, Liz Williamson

ORED Newsletter

ORSP Name Change

RED Talk

Businesses Invited to a Day With NASA

LINC Door Prize Winners

Review Of Snow And Ice Melting Techniques For Road And Bridge In Cold Regions, Tang Liyun, Shao Haitao, Tang Huaming, Qiu Peiyong, Du Xiaoqi, Zhang Lei, Peng Hui

Journal of China & Foreign Highway

Snow and ice melting of road and bridge surfaces is crucial for traffic safety，but current research on snow and ice melting techniques mainly focuses on engineering effects and technical evaluation，without the analysis and elaboration from the perspective of their mechanisms.To this end，based on the different mechanisms，this study divided snow and ice melting techniques into three types and summarized them：passive deicing，active deicing，and energy utilization deicing.This study systematically evaluated the advantages and disadvantages of traditional deicing methods such as deicing agents and mechanical deicing，analyzed two active deicing techniques，namely inhibitive freezing pavement and phase change material pavement，discussed the environmental-friendly method for road deicing …

Post‑Evaluation Method For Decision‑Making And Implementation Of Highway Maintenance Projects Based On Ahp‑Dematel, Yu Wei, Yang Na, Li Jue

Journal of China & Foreign Highway

Addressing the current lack of post-evaluation management systems related to highways，particularly highway maintenance，this paper proposed a post-evaluation method for the decision-making and implementation of highway maintenance projects based on the combination of analytic hierarchy process （AHP） and decision-making trial and evaluation laboratory （DEMATEL ）.After building a post-evaluation model for the decision-making and implementation of highway maintenance projects and designing the evaluation process，this paper calculated key factors influencing the post-evaluation of the decision-making and implementation of highway maintenance projects and their respective comprehensive weights.The research results indicate that decision-making can possess higher accuracy and efficiency under the above calculation method，providing a …

Bipolar Ionization Did Not Reduce Airborne Bacteria In A Lecture Hall, David A. Kormos, Nishit J. Shetty, Elliott T. Gall, Aaron J. Prussin, Amy Pruden, Linsey C. Marr

Mechanical and Materials Engineering Faculty Publications and Presentations

Ionization treatment of indoor air has attracted attention for its potential to inactivate airborne pathogens and reduce disease transmission, yet its real-world effectiveness remains unverified. We evaluated the impact of an in-duct, bipolar ionization system on airborne particles, including culturable bacteria, in a lecture hall. The ionizer was off with variable fan speed for 1 week, on with variable fan speed for a second week, and on with high and constant fan speed for a third week. We measured ion concentrations and aerosol particle concentrations, and we collected bioaerosol samples for analysis of 16S rRNA gene copies representing total bacteria …

Automation, Improvement, And Sensitivity Analysis Of 3d Parameterized Maize Stalk Models, Joseph Steven Carter

Theses and Dissertations

Maize is the most grown crop in the world. Each year, 5% of maize is lost due to a phenomenon known as stalk lodging (breakage of the stalk below the ear). One of the most promising solutions to stalk lodging is to design stalks with superior geometry to increase stalk strength. Researchers have developed a 3D parameterized maize stalk model, but these models take a long time to structurally analyze and are missing important material properties. This thesis addressed these problems by developing an automated package for analyzing the 3D parameterized maize stalk model, and by measuring the longitudinal shear …

Single Nanobubble Formation On Au Nanoelectrodes And Au@Ws2 Nanoelectrodes: Voltammetric Analysis And Electrocatalysis, Xian-Zhun Luo, Xiao-Hu Chen, Yong-Xin Li

Journal of Electrochemistry

Taking advantage of the extremely small size of the gold nanodisk electrode, the single hydrogen nanobubble generated on the surface of the nanoelectrode was studied to evaluate its hydrogen evolution performance. It was found that compared with the bare gold nanodisk electrode, the bubble formation potential of the gold nanodisk electrode modified with tungsten disulfide quantum dots (WS₂ QDs) on the surface was more positive, indicating that its hydrogen evolution activity was higher. Microdynamic model analysis shows that the average standard rate constant of the rate-determining step of the hydrogen evolution reaction of gold nanoelectrodes modified with WS_{2 …}

Platinum Nanoparticle-Based Collision Electrochemistry For Rapid Detection Of Breast Cancer Mcf-7 Cells, Fu-Xing Qin, Ming-Ke Li, Hui-Long Zhou, Wei Wen, Xiu-Hua Zhang, Sheng-Fu Wang, Zhen Wu

Journal of Electrochemistry

Cancer metastasis is the leading cause of death in cancer patients worldwide and one of the major challenges in treating cancer. Circulating tumor cells (CTCs) play a pivotal role in cancer metastasis. However, the content of CTCs in peripheral blood is minimal, so the detection of CTCs in real samples is extremely challenging. Therefore, efficient enrichment and early detection of CTCs are essential to achieve timely diagnosis of diseases. In this work, we constructed an innovative and sensitive single-nanoparticle collision electrochemistry (SNCE) biosensor for the detection of MCF-7 cells (human breast cancer cells) by immunomagnetic separation technique and liposome signal …

Goodbye With Tears! Deep Condolences To Academician Zhao-Wu Tian!, Editorial Office Of J.Electrochem.

Journal of Electrochemistry

No abstract provided.

The Adviser Of Journal Of Electrochemistry Professor Christian Amatore Received The Chinese Government Friendship Award, Editorial Office Of J.Electrochem.

Journal of Electrochemistry

No abstract provided.

Journal Of Electrochemistry Is Selected To Entering Ici Journals Master List, Editorial Office Of J.Electrochem.

Journal of Electrochemistry

No abstract provided.

Author Spotlight, Fei Li, Yi-Ge Zhou, Yi-Lun Ying, Yong-Xin Li, Yu Huang, Zhen Wu

Journal of Electrochemistry

No abstract provided.

Multiscale & Multiphysics Model Of Damage In Lithium-Ion Batteries, Edris Akbari

LSU Doctoral Dissertations

The demand for safer and more reliable lithium-ion batteries (LIBs) in electric vehicles has increased significantly, especially in addressing mechanical failures like internal short circuits (ISCs), which can lead to thermal runaway. This research investigates the mechanical behavior and damage mechanisms in lithium-ion pouch cells through a multiscale and multiphysics approach, focusing on Lithium Nickel Manganese Cobalt Oxide (NMC) and Lithium Iron Phosphate (LFP) batteries.

The study involved quasi-static and dynamic mechanical tests, including indentation and high-speed penetration, to evaluate stress-strain responses and fracture behaviors. Anisotropic mechanical properties were measured for individual battery components (anode, cathode, separator, and shell) using …

Design Of End Bent Piles For Downdrag, Tanna Frye

USF Tampa Graduate Theses and Dissertations

Embankments are commonly used for bridge approaches, with mechanically stabilized earth (MSE) walls being the preferred choice in Florida. However, the construction of embankments leads to the settlement of the underlying soil, regardless of soil type. When piles are driven before embankment construction, the initial settlement of the original soil creates relative movement between the pile and the surrounding soil, introducing frictional forces. When the existing soils move downward relative to the pile, a downward-oriented side shear known as downdrag is introduced. While downdrag is addressed in current codes and textbooks, it is often only briefly mentioned and primarily in …

Design Of Mathematical Model For Surface Roughness: Optimizing Rsm Through Process Parameters In Machining, Mevludin Shabani, Xhemajl Mehmeti

UBT International Conference

This research paper presents the design of mathematical model aimed at optimizing surface roughness, with a specific focus on the mean width of surface profile peaks (Rsm) during turning operations. It identifies cutting speed and feed rate as critical factors influencing Rsm, highlighting that feed rate exerts the most significant impact on surface quality. Increased feed rates result in coarser finishes due to greater distances between the cutting tool's contact points, whereas lower feed rates yield smoother surfaces. The study also explores how variations in feed rate can affect machining stability, leading to issues such as vibration, tool engagement challenges, …

Innovative Use Of Load Cell Technology For Analyzing Strength Of Plastic Shopping Bags: A Case Study, Ylli Rexhaj, Redon Rexhepi, Fidan Smaili

UBT International Conference

Load cells are essential components in modern measurement systems, widely utilized across various industries for precise force and weight measurements. This article presents the application of load cell technology in industry and in the testing field. In our project, an SC133 aluminum load cell with a highprecision weight sensor capable of measuring up to 20 kg was used. The load cell is mounted as a cantilever beam in a specially designed construction to ensure the testing of plastic bags and is connected through a microcontroller. The HX711 signal amplifier module was used, and data were monitored through an LCD screen …

Comparative Evaluation Of Microcontrollers For Real-Time Heart Rate Monitoring And Tachycardia/Bradycardia Detection, Arxhend Jetullahu, Luan Mulaku, Saranda Demolli

UBT International Conference

A surge in the yearning for portable gadgets related to healthcare has ignited a coupling of microchip controllers with models from the realm of machine learning, aimed at the task of immediate health observation. It's quite paramount, specifically in the context of identifying irregularities in heart rate, like tachycardia—where the heart races unusually fast—and bradycardia, an instance of a sluggish heartbeat. The neat thing is that this study takes a stab at contrasting the effectiveness among three popular microcontroller types—the ESP32, the Raspberry Pi, and the Arduino Nano 33 BLE Sense—in terms of real-time tracking of heartbeats and spotting any …

Using Object-Based Classification To Estimate Built-Up Density In An Urban Environment: A Case Study In Ferizaj, Kosova, Pajtim Zariqi, Lena Halounova

UBT International Conference

In this research, built-up density is quantified in Ferizaj’s urban setting through object-based classification on Planet Imagery (0.5m) acquired in 2019. The identification of homogeneous urban features is done by using ArcGIS Pro software and Mean Shift Segmentation. This segmentation is rather useful in the identification of clusters by incorporating the spatial and spectral characteristics that distinguish builtup and non-built-up regions. Training samples were obtained from satellite imagery and aerial images collected in 2019 with equal distribution of samples in the classification. Object-based classification has major benefits over pixel-based techniques in using spatial context and minimizing misclassification in urban areas. …

Fourier Transform Infrared Spectroscopic Characterization Of Raw And Thermally Treated Clays From Albania, Sidorela Vishkulli, Ilda Tole, Sonila Vito, Maria Hoxhaj, Ilirjana Boci

UBT International Conference

There is growing interest in using thermally treated clays as supplementary cementitious materials (SCMs) in construction. The suitability of the clays as SCMs varies according to their origin and composition. Clay minerals undergo several changes when heated, including dehydration, dehydroxylation, structural collapse, and new phases formation. This paper aims to evaluate the structural changes and modifications induced by thermal treatment of some selected clays from Albania. After grinding and sieving, the selected clays are treated thermally for one hour in different temperature values, ranging from 550 to 750°C. The raw and treated clays are analysed with FTIR spectrometer in order …

Expectations And Satisfaction Of Clients Who Collaborate With Architects For Interior Design, Ramadan Topuzi, Erblina Asani, Rrahim Sejdiu, Bujar Jashari, Agron Bajraktari

UBT International Conference

The study analyzes the needs, expectations and satisfaction of customers; considering the design skills of architects in the time of rapid technological developments and innovations, for the creation of an interior environment as attractive as possible. The study considers data from 230 respondents through questionnaires structured for this purpose, through purposive sampling as a non-probability sampling approach. The data were analyzed according to averages by grouping the respondents according to professions. The results show different levels of expectations regarding the time it takes to realize the design and the expected deadlines for the completion of the entire project. The design …

Comparison Between Concrete Column Retrofitting And Steel Jacketing, Blendi Ethemi, Asrim Rapuca

UBT International Conference

The project focuses on the strengthening of structural elements, specifically a column in a building being transformed from its current P+1 structure, used for residential purposes, into a new P+2 structure intended to serve as a bookstore and storage space. The analysis begins with the assessment of the current structure in two key aspects: the capacity of the existing column dimensions to accommodate new loads (ductility factor) and the verification of the concrete class through non-destructive testing. After completing the inspection of the current structure, two options are proposed for the central column of the building: concrete retrofitting by increasing …

Voltage Stability Analyses In Kosovo Power System, Kadri Kadriu, Armend Ymeri, Nexhmi Krasniqi

UBT International Conference

In recent years, there has been an increase in the frequency of blackouts in the system. On 21 June 2024 at 12:24 CET, due to a major incident in the Continental Europe power system region, a large part of the transmission systems of Albania, Montenegro, Bosnia and Herzegovina as well as Croatia suffered a voltage collapse followed by a total blackout. Research into preventing blackouts in power systems is crucial. Voltage stability analysis using the modal method is the focus of this paper, which is applied to the case study of the Kosovo power system. The voltage stability margin in …

Performance Analysis Of A 1 Mw Pv System Connected To The Distribution Grid, Armend Ymeri, Nexhmi Krasniqi, Kadri Kadriu, Alban Shala

UBT International Conference

This paper provides a thorough performance analysis of a 1 MW photovoltaic (PV) system integrated with the distribution network. The study evaluates the system's efficiency by examining the performance of both the PV modules and inverters. It presents detailed visualizations of the system, including peak power, the number of panels and inverters, panel orientation, tilt angles, and the spatial layout of the system in its deployment environment. Understanding these factors is crucial for assessing how the system will perform in its specific setting and for implementing necessary adjustments to enhance efficiency and electricity production. The paper highlights the impact of …

Water Quality Standards Assessment, Using Epanet Modeling– Prishtina Case – Oxidation-Reduction Of Manganese On Dw Network, Sokol Xhafa

UBT International Conference

Thermal stratification and water movement in reservoirs are key natural processes. While most effects of this movement are beneficial, such as increased oxygen levels, the presence of manganese (Mn) poses a challenge. During autumn, water circulation causes manganese to shift from its solid Mn(4+) form to the dissolved Mn(2+) form, preventing sedimentation and leading to issues in water treatment and distribution networks. This report focuses on these challenges at the Badovc Reservoir, near Prishtina, Kosovo. Built in 1965, Badovc is one of the oldest reservoirs in the country. Manganese, while usually an aesthetic issue that can cause "black water," can …

Building Efficient Energy And Pollution Control, Afrim Syla

UBT International Conference

The purpose of the Research paper is through the development of new integrated low energy building solutions entirely based on extensive energy savings and renewable energy supply to meet the society’s demands of 2030 and beyond for zero energy buildings. This is an attempt to develop a working definition for Zero Energy Building, which can be used by the participants in the research paper to focus their research and their development of new technologies. Secondly, the working definition might also be used as basis for a discussion of ”Near Zero Energy Building” definition for future energy regulations in Kosovo that …

Sensitivity Of Asphalt Pavements To Extreme Weather Conditions, Bekim Selimi, Beni Kizolli

UBT International Conference

Asphalt pavements constructed in warmer climates are more prone to rutting, whereas pavements in colder climates are more susceptible to cracking. Pavement mixtures should be designed not only to handle the high stresses exerted by wheel loads but also to withstand thermal stresses caused by extreme weather conditions. For heavy-duty pavements, it is crucial that both coarse and fine aggregate particles meet quality characteristics related to shape, texture, durability, and absorption. The selection of the asphalt binder for mixture design is equally important. The choice of high and low performance grades of asphalt binder primarily depends on the project’s location. …

Exploring Interpretable Machine Learning For Modeling Nonlinear Dynamic Systems, Liron Morina, Rina Peja, Getoar Vranovci

UBT International Conference

This paper provides an analysis of the interpretable machine learning (IML) approach applied to various nonlinear dynamic systems. The study focuses on modeling the restoring force by neural networks with two input values: displacement and velocity. A parallel neural network with the proposed architecture, initialized randomly, mirrors the designed model. Both models undergo multiple training and testing cycles on identical datasets to ensure robust statistical validation. The findings demonstrate that interpretable artificial neural networks (ANNs) outperform randomly initialized models in terms of accuracy and result consistency. This research provides valuable insights into the application of IML techniques for advancing the …

The Importance Of Gypsum In The Process Of Hydration Of Cement, Ibush Luzha, Bujar Aliu, Teodor Zguro

UBT International Conference

Gypsum plays an essential role in the cement bonding process of hydration of cement, acting as a setting time regulator. In the construction industry, Portland cement, which is the most commonly used, tends to strengthen very quickly after mixing with water, making it difficult to manipulate and shape. By adding small amounts of gypsum to the mix, the setting time is extended, allowing to work with the material for a longer period of time. This also regulates the exothermic reaction, avoiding possible cracks and damages in the built structures. In addition, gypsum contributes to improving the overall quality of the …

Analysis Of Bicycle Network Infrastructure - Example Of Gjakova Municipality, Beni Kizolli, Florin Halili

UBT International Conference

Asphalt During the war (1998-1997), the municipality of Gjakova suffered great destruction, especially in terms of construction and infrastructure. Since that time, the demand for new constructions and reconstructions of old residential houses as well as road infrastructure was increasing. The development of the construction and infrastructure sector has also influenced the increase in the number of employees in this sector. Due to the lack of experience in this field, many professional and complex problems have been encountered both in the field of infrastructure and in the field of traffic regulation. The formation of the state of Kosovo (1999-2007), initially …