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Articles 61 - 90 of 121037
Full-Text Articles in Entire DC Network
Comparative Performance Evaluation Of Generative Ai-Assisted Acoustic Tiles From Recycled Educational Waste, Nada Ahmed Talaat, Ahmed Mahmoud Elfakarany, Nihal Atif Salim
Comparative Performance Evaluation Of Generative Ai-Assisted Acoustic Tiles From Recycled Educational Waste, Nada Ahmed Talaat, Ahmed Mahmoud Elfakarany, Nihal Atif Salim
HBRC Journal
Noise pollution is increasingly recognized as a critical environmental challenge with direct implications on public health and well-being. In Egypt, data from the Egyptian Environmental Affairs Agency (EEAA, 2019) identify noise as the second most reported environmental concern, affecting both indoor and outdoor spaces. At the same time, the growing volume of waste generated on university campuses represents an underexploited resource for sustainable design. This study addresses these challenges by investigating how generative AI can serve as a design collaborator in suggesting high-performance acoustic tiles from recycled campus waste. Two AI-driven prototypes were developed through prompts emphasizing acoustic absorption, aesthetic …
50 Years Of Irrigation District Modernization In The Usa -- Then And Now, Charles M. Burt
50 Years Of Irrigation District Modernization In The Usa -- Then And Now, Charles M. Burt
BioResource and Agricultural Engineering
Irrigation district modernization in the USA has seen changes in management attitudes, hardware, software, and the shouldering of responsibilities for environmental issues that were never envisioned fifty years ago. The pace of modernization is quite variable depending upon the state and location within the state. This paper provides some insights into the evolution of several aspects of modernization over that fifty year time span.
Comprehensive Variable-Temperature Raman And Spectroscopic Ellipsometry Investigation Of Bulk Undoped, Fe-Doped, And Ge-Doped Gan: Correlated Phonon, Carrier, Optical, And Disorder Dynamics, Manika Tun Nafisa, Sm Atiqur Rahman, Zhe Chuan Feng, Sandip Das, James N. Hilfiker, Nina Jong, Ian T. Ferguson, Benjamin Klein
Comprehensive Variable-Temperature Raman And Spectroscopic Ellipsometry Investigation Of Bulk Undoped, Fe-Doped, And Ge-Doped Gan: Correlated Phonon, Carrier, Optical, And Disorder Dynamics, Manika Tun Nafisa, Sm Atiqur Rahman, Zhe Chuan Feng, Sandip Das, James N. Hilfiker, Nina Jong, Ian T. Ferguson, Benjamin Klein
Faculty Articles
Bulk gallium nitride (GaN) substrates with controlled electrical compensation and doping are foundational materials for high-power electronics, optoelectronics, and emerging spintronic devices. Despite extensive studies on epitaxial GaN thin films, a complete and correlated understanding of crystal, phonon, free-carrier, birefringence, optical, and disorder-driven processes in high-quality bulk GaN crystals remains limited. In this work, a comprehensive temperature-dependent (25–300 °C) investigation of free-standing bulk undoped, Fe-doped, and Ge-doped GaN substrates using Raman spectroscopy, spectroscopic ellipsometry (SE), and atomic force microscopy (AFM) has been presented. A detailed analysis of phonon evolution, apparent Raman-shift-derived biaxial stress and in-plane strain, longitudinal optical phonon–plasmon coupling …
Source Page Evaluation Of Local Rag Retrieval For Engineering Safety: Implications For Mechanical And Civil Engineering, Sherif Sorour, Areej El Mufti, Mohamed Nabawy, Anwar Sahbel
Source Page Evaluation Of Local Rag Retrieval For Engineering Safety: Implications For Mechanical And Civil Engineering, Sherif Sorour, Areej El Mufti, Mohamed Nabawy, Anwar Sahbel
Civil Engineering
Industrial safety question answering requires access to the exact source material that supports an answer, not merely a related document. This study evaluates the retrieval stage of a local retrieval-augmented generation (RAG) system at the source page level. Eighteen documents on lockout/tagout, machine guarding, and personal protective equipment were prepared in raw, cleaned, and metadata-enriched forms. Best Matching 25 (BM25), latent semantic analysis (LSA), and reciprocal rank fusion (RRF) hybrid retrieval were tested on 54 questions: 36 answerable, 12 safety-related but unsupported, and 6 outside the covered topics. Raw BM25 achieved the highest mean reciprocal rank (0.492) and Hit@5 (0.722), …
Sensor Technologies And Integration Approaches For Smart Prosthetic Health Monitoring: A State-Of-The-Art Narrative Review, Mohammed Q. Abdulhasan, Jumaa S. Chiad, Firas M. Abdulghani
Sensor Technologies And Integration Approaches For Smart Prosthetic Health Monitoring: A State-Of-The-Art Narrative Review, Mohammed Q. Abdulhasan, Jumaa S. Chiad, Firas M. Abdulghani
AUIQ Technical Engineering Science
Transforming the residual-limb-socket interface from an intermittently evaluated ``black box'' into a monitored clinical setting that permits objective fit assessment, early danger detection, and better long-term prosthesis use is the aim of smart prosthetic health monitoring. This narrative exploration compiles peer-reviewed literature on sensing technology and, importantly, integration strategies that affect practical usability. Iterative searches by keywords and citation linking across major engineering and biomedical journal platforms were used to find literature, giving priority to current contributions while preserving important foundational works. The chosen studies were examined and classified based on (i) sensing modality (pressure/shear, temperature-humidity microclimate, chemical and perfusion-related …
Synthesis Protocols For Solar Cell Materials From Laboratory Fabrication To Scalable Manufacturing, Ayad Abbood Abdulhasan, A. M. Mustafa, Mohanad Muzahem Khalaf
Synthesis Protocols For Solar Cell Materials From Laboratory Fabrication To Scalable Manufacturing, Ayad Abbood Abdulhasan, A. M. Mustafa, Mohanad Muzahem Khalaf
AUIQ Technical Engineering Science
Photovoltaic (PV) technology has evolved over seven decades from single-crystal silicon cells with modest efficiencies to a diverse portfolio of silicon, thin-film, and emerging solar-cell architectures approaching or exceeding thermodynamic single-junction limits when combined in tandem configurations. Device efficiency and long-term operational stability are governed not only by the choice of absorber material but, critically, by the synthesis protocol used to fabricate it the crystal-growth method, deposition technique, solvent system, thermal budget, and interface-engineering strategy all leave a lasting imprint on morphology, defect density, and carrier transport. This review provides a comprehensive, protocol-centered survey of solar-cell synthesis across three technology …
Research On The Early Warning Model Of Online Public Opinion Risk Based On Cross-Social-Media Platforms, Tiejun Cheng, Tong Wang, Jianxiang Wei, Lanping Feng
Research On The Early Warning Model Of Online Public Opinion Risk Based On Cross-Social-Media Platforms, Tiejun Cheng, Tong Wang, Jianxiang Wei, Lanping Feng
Journal of Scientific Information Research
[Purpose/significance] Under the influence of cross-social media interactions, online public opinion can ferment simultaneously across different media platforms, deeply interact, and resonate multiple times, which is more likely to trigger a chain reaction of risks or even new types of risks. Therefore, it is significant to analyze the interactive influence of risks based on cross-social media public opinion data to promote the management of online public opinion towards preemptive prevention and early warning. [Method/process] Firstly, based on the analysis of the risk characteristics of cross-social media public opinion, a risk early warning indicator system for cross-social media online public opinion …
Building Services Engineering September/October 2026
Building Services Engineering September/October 2026
Building Services Engineering
This issue of Building Services Engineering explores Ireland's net-zero transition, highlighting AI data centre liquid-cooling innovations, critical energy infrastructure updates, ASHRAE and CIBSE safety insights, commercial heat pump selections, decarbonising elevators, and examples of engineering innovation and leadership across the building services sector.
The Army Spreads Its Wings: Army Aviation And Its Influence On War, Christopher J. Braund
The Army Spreads Its Wings: Army Aviation And Its Influence On War, Christopher J. Braund
Doctoral Dissertations and Projects
Today’s United States Army operates some of the world's most advanced helicopters, conducting some of the most dangerous aerial insertions and close air support missions. Every Army infantry division has a helicopter brigade, with capabilities ranging from command-and-control to attack, scout, and lift assets. Yet, that is a relatively new concept. Developed in the 1960s, the air mobility doctrine emerged from the Eisenhower Administration’s New Look defense policy, giving the Army direction on how to use helicopters within its overall land warfare capability. This dissertation looks at how that occurred. It fills a major gap in the historiography of Army …
An Integrated Review Of Maritime Emission Reduction Through Regulatory Operational Fuel And Technological Approaches, Ehab S. Elabd, Ahmed M. Shama
An Integrated Review Of Maritime Emission Reduction Through Regulatory Operational Fuel And Technological Approaches, Ehab S. Elabd, Ahmed M. Shama
Blue Economy
The research endeavor at hand is basically meant to trace the most prominent regulatory, operational, fuel-related, and technological approaches employed for maritime emission reduction. From a quantitative perspective, the conducted review comprises four major categories and 80 research contributions. Operational optimization and efficiency strategies and alternative-fuel solutions take the largest shares of the investigations reviewed. Operational optimization and efficiency strategies comprise 29 studies (36.3%), while alternative-fuel solutions comprise 28 studies (35.0%). Comparably, port-related emissions and mitigation strategies include 15 studies (18.8%), whereas design optimization and technological innovations incorporate 8 studies (10.0%). Considering the fact that maritime transport is responsible for …
Glutaraldehyde-Crosslinked Chitosan And Zinc Oxide Coating Reinforced With Polysulfone On Copper As A Platform For Electrochemical Formaldehyde Sensing, Anceu Murniati Anm, Rahmat Saputra Rs, Arie Hardian Ah, Manty Aldilani Ikaningsih Mai, Moh Haifan Haifan
Glutaraldehyde-Crosslinked Chitosan And Zinc Oxide Coating Reinforced With Polysulfone On Copper As A Platform For Electrochemical Formaldehyde Sensing, Anceu Murniati Anm, Rahmat Saputra Rs, Arie Hardian Ah, Manty Aldilani Ikaningsih Mai, Moh Haifan Haifan
Chimica et Natura Acta
Formaldehyde monitoring requires electrochemical platforms with stable structures and reliable interfacial responses. This study aimed to prepare and characterize a Cu|CS–GLA/ZnO–PSf composite film on a copper substrate as a platform for further formaldehyde-sensing development. The film was characterized using FTIR, SEM–EDX, XRD, and cyclic voltammetry. FTIR supported the presence of features associated with chitosan, imine, polysulfone, and Zn–O, while SEM–EDX revealed a heterogeneous polymer-rich coating with Zn- and O-containing domains distributed non-uniformly. XRD indicated a predominantly amorphous or poorly crystalline structure. Cyclic voltammetry showed scan-rate-dependent peak separations, with ΔEp increasing from 0.632 to 0.777 V in citrate buffer and from …
Securing The Frontier: Environmental Adaptation Versus Urban Fortification In Strategic Border Gateways: The Case Of East Qantara, Ahmed M. Selim, Mohamed A. Shebl, Doha M. Saeed, Heba M. Gaber
Securing The Frontier: Environmental Adaptation Versus Urban Fortification In Strategic Border Gateways: The Case Of East Qantara, Ahmed M. Selim, Mohamed A. Shebl, Doha M. Saeed, Heba M. Gaber
HBRC Journal
Security-oriented urban design at strategic national gateways often restricts spatial openness, cultural identity, and social inclusion, all essential to functional public spaces. This study develops a multi-criteria framework for security-inclusive urban design at East Qantara, the primary vehicular gateway between continental Egypt and the Sinai Peninsula. This study employed a sequential quantitative–interpretive design approach. In the quantitative phase, 51 criteria were identified from Crime Prevention Through Environmental Design (CPTED) principles, Hostile Vehicle Mitigation (HVM) guidance, publicness theory, and context-specific desert and socio-cultural literature, and subsequently revised to 37 criteria through expert panel validation. A structured expert questionnaire with a five-point …
Estimation Of Unmeasurable External Disturbances Of A Dynamic Object Based On A Robust Adaptive Kalman Filter, Bunyod Mamurjon Ugli Buronov
Estimation Of Unmeasurable External Disturbances Of A Dynamic Object Based On A Robust Adaptive Kalman Filter, Bunyod Mamurjon Ugli Buronov
Technical science and innovation
This article considers the problem of directly estimating unmeasurable external disturbances acting on a dynamic object under the condition that the state vector of the object is available for measurement. In the considered case, the problem is reduced to the estimation of an unknown input of a dynamic system. It is shown that when the system state is measurable, both a direct inversion scheme based on the object’s dynamic equation and filtering methods that eliminate the need for coarse numerical differentiation can be applied. For slowly varying disturbances, a random walk model with a small process noise covariance is proposed, …
Where Do We Go Now: An Examination Of The Role Of 3d Modeling In Cancer Research, Ella Claire Gregory, Hannah Noelle Cochran
Where Do We Go Now: An Examination Of The Role Of 3d Modeling In Cancer Research, Ella Claire Gregory, Hannah Noelle Cochran
ABE 4523/6523 Biomedical Materials
The development of three-dimensional tumor models has become an important area of cancer research. By incorporating biomaterials that can mimic the physical, chemical, and biological characteristics of the tumor environment. 3D models can provide a more physiologically relevant environment for studying tumor growth, cell interaction, metastasis, and drug response.
Satellite-Based Detection And Preliminary Flux Estimation Of The 2024 Boysun Methane Blowout Event In Uzbekistan, Shomurod Bakhtiyor Ugli Turaev, Dilbar Shamurodovna Fazilova, Aziz Nigmanovich Kazakov
Satellite-Based Detection And Preliminary Flux Estimation Of The 2024 Boysun Methane Blowout Event In Uzbekistan, Shomurod Bakhtiyor Ugli Turaev, Dilbar Shamurodovna Fazilova, Aziz Nigmanovich Kazakov
Technical science and innovation
Estimating accidental methane emissions from gas fields remains a difficult task, especially in remote mountainous areas where continuous ground-based observations are not available. This study examines the uncontrolled gas blowout that occurred in 2024 at the “Mustaqillikning 25-yilligi” gas-condensate field in Boysun district, Uzbekistan. Changes in methane content were analyzed using Sentinel-5P TROPOMI data for August–November 2024, processed in Google Earth Engine (GEE). The location of the accident site was refined using Sentinel-2 optical imagery, while ERA5 wind speed and direction data were applied for the preliminary calculation of methane flux. Based on the XCH₄ time series, four stages of …
Automatic +1 Diffraction Order Detection In Off-Axis Digital Holographic Interferometry Using An Energy-Based Spectral Model, Nigora Alimdjanovna Akbarova, Dilnoza Ibrokhim Kizi Abdulkhayeva
Automatic +1 Diffraction Order Detection In Off-Axis Digital Holographic Interferometry Using An Energy-Based Spectral Model, Nigora Alimdjanovna Akbarova, Dilnoza Ibrokhim Kizi Abdulkhayeva
Technical science and innovation
This paper presents an automatic +1 diffraction order detection algorithm for off-axis digital holographic interferometry (DHI Manual spectral filtering is widely used to find out the desired order of diffraction in the Fourier domain in conventional digital holographic reconstruction. Nevertheless, this approach is very subjective and must be subject to expert guidance, thus, the reconstruction reproducibility and stability can often deteriorate. To address these limitations, this designed scheme constructs a spectral model utilizing energy-maximization as well as adaptive DC suppression and dynamic filter radius estimates. The algorithm itself can automatically observe the distribution of energy in the hologram spectrum and …
Engineering-Geological And Seismic Conditions Of Arid Territories, Mirabbas Mirsaatovich Zakirov, Golibjon Ernazar Ugli Ochilov, Dilshod Kalandarovich Begimkulov, Inobat Abduvakhidovna Agzamova, Temur Makhmarajabovich Khudoyberdiyev, Ayzada Qaunis Jetpisbaeva
Engineering-Geological And Seismic Conditions Of Arid Territories, Mirabbas Mirsaatovich Zakirov, Golibjon Ernazar Ugli Ochilov, Dilshod Kalandarovich Begimkulov, Inobat Abduvakhidovna Agzamova, Temur Makhmarajabovich Khudoyberdiyev, Ayzada Qaunis Jetpisbaeva
Technical science and innovation
This article presents the results of an assessment of seismic intensity increments depending on the engineering and geological conditions of arid areas in the Muynak district, located in the current Aral Sea crisis zone. Natural and man-made factors shaping the geological environment are examined, including geological structure, lithological and stratigraphic composition, soil physical and mechanical properties, and hydrogeological conditions. Based on the analysis of engineering-geological data, normative classifications of soils according to seismic properties and field research materials, seismic microzoning of the territory was carried out, identifying areas with initial seismicity (“0”) and zones with an increase in seismic intensity …
Evaluation Of The Metrological Characteristics Of An Ultrasonic Flowmeter For Water Resources, Makhsud Idrisovich Makhmudov, Uktam Farkhodovich Mamirov, Siroj Sobirovich Nurov
Evaluation Of The Metrological Characteristics Of An Ultrasonic Flowmeter For Water Resources, Makhsud Idrisovich Makhmudov, Uktam Farkhodovich Mamirov, Siroj Sobirovich Nurov
Technical science and innovation
This paper presents the results of evaluating the metrological characteristics of a developed ultrasonic flowmeter intended for measuring water flow in open channels. The study analyzes the main sources of measurement errors and classifies them into methodological, instrumental, additional, systematic, and random components. Experimental investigations were carried out to estimate the random and systematic errors under steady-state flow conditions. Using the least-squares method, the systematic error was separated into additive and multiplicative components, providing a basis for calibration and correction of the measurement results. The reliability of the developed measuring instrument was evaluated using the failure rate method based on …
Mathematical Modelling Of Nitrification And Denitrification Processes Based On Neuro-Fuzzy Bioreactor Models, Mirkhalil Agzamovich Ismailov, Boburbek Zokirjon Ugli Mannobjonov
Mathematical Modelling Of Nitrification And Denitrification Processes Based On Neuro-Fuzzy Bioreactor Models, Mirkhalil Agzamovich Ismailov, Boburbek Zokirjon Ugli Mannobjonov
Technical science and innovation
This paper presents the development and investigation of hybrid neural network and fuzzy models for the mathematical modelling of nitrification and denitrification processes in a biological wastewater treatment bioreactor. A comprehensive approach is proposed, integrating a mechanistic model of the ASM1/ASM2d type with neural networks (LSTM and Gaussian Process Regression), as well as a fuzzy control system based on an extended set of expert rules. A digital twin of the bioreactor was developed to allow for the prediction of the dynamic behavior of key parameters such as NH₄⁺, NO₃⁻, dissolved oxygen, etc. within a prediction range of 1 to 12 …
Investigation Of The Production Technology Of Environmentally Safe Urethane Oligomers Based On Local Raw Materials, Bakhtiyor Kudratovich Shaykulov, Dilafruza Ruziboevna Akbarova Gulboeva, Fayzulla Nurmuminovich Nurqulov
Investigation Of The Production Technology Of Environmentally Safe Urethane Oligomers Based On Local Raw Materials, Bakhtiyor Kudratovich Shaykulov, Dilafruza Ruziboevna Akbarova Gulboeva, Fayzulla Nurmuminovich Nurqulov
Technical science and innovation
This paper investigates the step-by-step poly condensation pathway for synthesizing environmentally friendly, non-isocyanate urethane oligomers derived from local and safe raw materials: urea and ethylene glycol. The influence of thermodynamic parameters on the target product yield was systematically evaluated to determine the optimum technological matrix. Specifically, a 1:2 reactant mass ratio, a stable stationary temperature of 150-155 °C, and a reaction duration of 2 hours under an inert nitrogen atmosphere resulted in a sustainable and reproducible yield of 72%. Thermal degradation and competitive side-product condensations were activated above 160 °C, leading to a sharp drop in overall chemical efficiency. The …
Analysis And Study Of The Content Of Chloride Salts In Oil, Natalia Evgenievna Sheina, Muborak Akramovna Mirshomilova
Analysis And Study Of The Content Of Chloride Salts In Oil, Natalia Evgenievna Sheina, Muborak Akramovna Mirshomilova
Technical science and innovation
The article addresses the critical issue of crude oil quality control, specifically focusing on the determination of chloride salts (sodium, calcium, and magnesium), which exert a destructive impact on processing equipment. The paper provides a detailed analysis of the adverse effects of salts, which lead to severe equipment corrosion, scaling, and a reduced yield of valuable oil fractions. The chemical principles and specific applications of two standardized methods for analyzing aqueous extracts according to GOST 21534-2021 and ASTM D3230 are described: indicator (argentometric and mercurimetric) and potentiometric titration. The experimental section presents the results of a comparative analysis of crude …
On The Issue Of Developing Diagnostic Systems In Case Of Incompleteness Of Data, Amanulla Azizovich Kadirov, Shohijahon Ulugbek Ugli Akhmetov
On The Issue Of Developing Diagnostic Systems In Case Of Incompleteness Of Data, Amanulla Azizovich Kadirov, Shohijahon Ulugbek Ugli Akhmetov
Technical science and innovation
This paper addresses the problem of developing diagnostic systems for industrial equipment when initial failure data is incomplete or unavailable. An approach is proposed for generating synthetic data based on a pseudo-failure generator that implements stochastic modeling of degradation processes. A formalized algorithm for generating time-to-failure samples has been developed, including stages of failure physics analysis, statistical model selection, distribution parameterization, and simulation of operating conditions. The Weibull distribution is used as the base model, allowing for the consideration of various stages of the equipment’s life cycle. Additionally, factors that bring the synthetic data closer to real operating conditions are …
Evaluation Of Level Measurement Uncertainty For Three Types Of Laser Level Meters Using The Gum Methodology: Calculated Uncertainty Budgets, Uncertainty Profile, And Hardware Component Requirements, Lazizbek Furkatjanovich Saidoripov, Barat Makhmudovich Akhmedov
Evaluation Of Level Measurement Uncertainty For Three Types Of Laser Level Meters Using The Gum Methodology: Calculated Uncertainty Budgets, Uncertainty Profile, And Hardware Component Requirements, Lazizbek Furkatjanovich Saidoripov, Barat Makhmudovich Akhmedov
Technical science and innovation
A methodology is presented for evaluating the uncertainty of liquid petroleum product level measurements using laser level meters based on different measurands’ informative parameters: propagation time, phase difference, and image coordinates. Based on analytical expressions for error components and a traceability chain to the national length standard, calculated uncertainty budgets are developed in accordance with JCGM 100 for time-of-flight, phase-based, and laser–television level meters. Under the assumed input conditions, the expanded uncertainties (k = 2) are 1.66, 0.73, and 1.02 mm, respectively. For the laser–television level meter budget, the Gaussian approximation is verified using the Monte Carlo method (JCGM 101): …
Development Of An Experimental Stand For The Study Of The Directions Of Movement And Velocity Of Air Flows In The Pneumatic Channel Of The Final Aspiration Of The Muz-16 Air Sieve Separator, Hanna Borisovna Torgan, Zulfiya Kakhramonovna Ergasheva
Development Of An Experimental Stand For The Study Of The Directions Of Movement And Velocity Of Air Flows In The Pneumatic Channel Of The Final Aspiration Of The Muz-16 Air Sieve Separator, Hanna Borisovna Torgan, Zulfiya Kakhramonovna Ergasheva
Technical science and innovation
The article presents the results of experimental studies on the rheological properties of pasta dough obtained from various types of wheat flour (bakery highest grade, as well as durum varieties of Belarusian selection). The regularities of changes in the yield shear stress, plastic viscosity, and shear rate of the semi-finished product were studied depending on the key technological factors of extrusion: moisture content (0.28–0.335 kg/kg), temperature (25–55 °C), and discharge pressure (up to 88 · 10-5 Pa). The operating principle and design features of the modernized pressing unit and die using special converging-diverging (confuser-diffuser) inserts (according to the patents …
Research On The Effectiveness Of Various Methods For Primary Processing Of Silkworm Cocoons, Doston Ishmukhammat Ugli Samandarov
Research On The Effectiveness Of Various Methods For Primary Processing Of Silkworm Cocoons, Doston Ishmukhammat Ugli Samandarov
Technical science and innovation
This article presents the results of experimental studies of the primary processing (killing) of silkworm pupae using existing technological methods, as well as three different combinations of infrared (IR) and ultrasound (US). A series of pilot studies was conducted in the laboratory of the Department of Service Technology at Tashkent State Technical University on nine cocoon samples using existing technological equipment and an experimental setup developed under project AL-8724053050 and based on the combined effects of infrared radiation and ultrasound. A comparative evaluation of the studied processing methods was conducted based on the degree of pupal killing, moth hatching, process …
Effect Of Waste Cooking Oil And Tapioca Starch On Energy Content And Combustion Performance Of Coconut Shell-Rice Husk Briquettes, Satworo Adiwidodo, Wirawan Wirawan, Kris Witono, Moh. Hartono, Asrori Asrori, Fauzan Baananto, Suliono Suliono, Syahrul Mubarok, Norhafana Binti Mohamed
Effect Of Waste Cooking Oil And Tapioca Starch On Energy Content And Combustion Performance Of Coconut Shell-Rice Husk Briquettes, Satworo Adiwidodo, Wirawan Wirawan, Kris Witono, Moh. Hartono, Asrori Asrori, Fauzan Baananto, Suliono Suliono, Syahrul Mubarok, Norhafana Binti Mohamed
Journal of Mechanical Engineering Science and Technology (JMEST)
Agricultural waste, such as coconut shells and rice husks, is widely utilized as solid fuel. Tapioca starch serves as the binder, while waste cooking oil (WCO) is used as an additive. Briquette performance is influenced by the type of biomass, binder, and additives used. However, the individual and interactive effects of WCO and tapioca starch on the performance of coconut shell-rice husk briquettes remain insufficiently established. This research focused on evaluating the effects of WCO and tapioca starch on calorific value (CV) and mass consumption rate. The briquettes' base composition consisted of 75% coconut shell charcoal and 25% rice husk …
A Nonlinear Viscoelastic 3d Bellows Microspring Fabricated With Two-Photon Polymerization, Harris J. Hall, Tyler Grunzke, Samuel Campbell, Hengky Chandrahalim
A Nonlinear Viscoelastic 3d Bellows Microspring Fabricated With Two-Photon Polymerization, Harris J. Hall, Tyler Grunzke, Samuel Campbell, Hengky Chandrahalim
Faculty Publications
In the past decade, two-photon polymerization (TPP) based 3D printing has gained popularity for prototype fabrication of micro and nanoscale structures and mechanical metamaterials. However, practical considerations including response uniformity, nonlinear behaviors, and material aging effects remain challenges for device maturation and are seldom reported. In this work, a pair of cylindrical microscale bellows springs (~ 100 μm diameter), fabricated with a commercial TPP 3D printer, are shown to exhibit nonlinear stiffness profiles under compression (up to ~ 7%), with distinct linear and nonlinear regions, that change significantly after ~ 9–10 months of open air exposure in ambient lab conditions. …
Developing A Digital Facility Management Framework For Enhancing Operation And Maintenance Of Public Parks In Egypt, Alaa Ezzat, Alia Amer, Yasser M. El Sayed
Developing A Digital Facility Management Framework For Enhancing Operation And Maintenance Of Public Parks In Egypt, Alaa Ezzat, Alia Amer, Yasser M. El Sayed
HBRC Journal
Public parks in Cairo represent important urban assets, however, their operation and maintenance (O&M) face many challenges due to fragmented information, reactive maintenance practices, organizational constraints, and limited digital integration. Digital Facility Management discipline still lacks the tailored framework that adequately addresses the operational needs of public parks in Egypt with all its specific details. This study develops an integrated digital FM framework for improving the efficiency of the management process of public parks. A four-phase methodology was adopted, comprising a literature review, framework development, technical system specification, and expert assessment. The proposed framework integrates BIM, COBie, CMMS, IoT technologies, …
Machine Learning Models For Estimating The Consumed And Remaining Useful Life Of Haul Trucks In An Open-Pit Mine In Peru, Marco Cotrina, Jairo Marquina, Mario Sandoval, Jose Mamani, Johnny Ccatamayo
Machine Learning Models For Estimating The Consumed And Remaining Useful Life Of Haul Trucks In An Open-Pit Mine In Peru, Marco Cotrina, Jairo Marquina, Mario Sandoval, Jose Mamani, Johnny Ccatamayo
Journal of Sustainable Mining
The purpose of this study was to develop a machine learning-based model to predict the consumed useful life and estimate the remaining useful life of haul trucks in an open-pit mining operation in Peru. A comparative analysis of multiple machine learning models was conducted, including multiple linear regression (MLR), random forest + PSO, support vector regression (SVR), gradient boosting machine (GBM), decision tree + PSO, and artificial neural networks (ANN-MLP). The models were evaluated using performance metrics such as R2, RMSE, and MAE, selecting the optimal model to estimate the remaining useful life based on a theoretical lifespan …
Development Of A Spectral Index And Web Application For Automated Marble Quarry Monitoring: A Sentinel-2 Based Approach For Change Detection And Monitoring, Konstantinos Ntouros, Vasileios Drimzakas - Papadopoulos, Georgios Gkologkinas, Georgios Ntouros, Dimitrios Markou
Development Of A Spectral Index And Web Application For Automated Marble Quarry Monitoring: A Sentinel-2 Based Approach For Change Detection And Monitoring, Konstantinos Ntouros, Vasileios Drimzakas - Papadopoulos, Georgios Gkologkinas, Georgios Ntouros, Dimitrios Markou
Journal of Sustainable Mining
This study introduces an automated workflow to monitor marble quarry operations using Sentinel-2 satellite data, providing a cost-effective and efficient tool for regulatory oversight focused on environmental sustainability. At the core of this workflow is the Quarry Change Detection Index (QCDI), a new spectral index specifically developed to leverage the unique spectral characteristics of quarry sites, enhancing the detection of land cover changes associated with quarry expansion. To facilitate practical application, a web-based tool was developed using Google Earth Engine and Streamlit. The user-centric design of this platform features an intuitive interface, allowing users to easily select parameters, visualize data, …