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Mission Analysis And Control Optimization Of Reusable Rockets With Retropropulsion For Low Earth Orbit Missions, Khalid A Juhany Jun 2025

Mission Analysis And Control Optimization Of Reusable Rockets With Retropropulsion For Low Earth Orbit Missions, Khalid A Juhany

Journal of King Abdulaziz University: Engineering Sciences

This study presents a comprehensive mission analysis and control framework for reusable launch vehicles (RLVs) employing retropropulsion-assisted vertical takeoff and landing (VTVL) configurations. The focus is on a two-stage RLV optimized for Low Earth Orbit (LEO) missions, with the first stage designed for reusability. Inspired by proven systems such as SpaceX's Falcon 9 and DLR's RETALT-2, the vehicle incorporates a nine-engine cluster and retropropulsion for booster recovery. The ascent phase is modeled using point mass and three-degrees-of-freedom (3-DOF) simulations, while the descent is evaluated through a six-degrees-of-freedom (6-DOF) dynamic model integrated with a neural network-based NARMA-L2 controller to optimize fuel …

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Synthesis And Characteristics Of Cerium Vanadate-Strontium Oxide: Exploring Novel Composite Material, Sunnia Shafiq, Adeeba Noshahi, Muhammad Shahid Shafique, Bushra Kanwal, Shavezah Nazeer, Zainab Javed, Rabia Zahoor Jun 2025

Synthesis And Characteristics Of Cerium Vanadate-Strontium Oxide: Exploring Novel Composite Material, Sunnia Shafiq, Adeeba Noshahi, Muhammad Shahid Shafique, Bushra Kanwal, Shavezah Nazeer, Zainab Javed, Rabia Zahoor

Journal of King Abdulaziz University: Engineering Sciences

The study describes the synthesis and characterization of Cerium Vanadate-Strontium Oxide (CeVO4-SrO) nanocomposite. It emphasizes the importance of nanoparticles in various scientific applications, especially energy storage. The study used a hydrothermal approach with particular precursor components to synthesize the nanocomposite. The resultant materials are examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to evaluate their crystallite sizes and structural characteristics. The study found that SrO has an irregular rough shape, CeVO4 appears spherical, and the composites have a nanorod-like structure. UV-visible spectroscopy provides discrete absorbance peaks, which confirm the material's optical characteristics. The conclusion highlights …

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The Future Is Inclusive, Victoria Mcclendon Jun 2025

The Future Is Inclusive, Victoria Mcclendon

Theses and Dissertations

Victoria McClendon THE FUTURE IS INCLUSIVE 2024-2025 Stephanie Lezotte, Ph.D. Master of Arts in Higher Education This research explores the role of Diversity, Equity, and Inclusion (DEI) programs in higher education, specifically focusing on the impact of inclusion through Rowan University’s Unified Sports program. DEI programs are designed to support historically underrepresented groups, including students of color, LGBTQ+ students, students with disabilities, and other marginalized communities. This study examines the importance of DEI in fostering inclusive educational environments and investigates the consequences of removing such programs. A qualitative case study approach is employed, involving group interviews with students and faculty …

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Pengaruh Emotional Intelligence, Locus Of Control, Risk Aversion, Dan Financial Literacy Terhadap Risky Investment Intention Di Indonesia, Sekar Savira Ramadhani, Maria Ulpah, Wardatul Adawiyah Jun 2025

Pengaruh Emotional Intelligence, Locus Of Control, Risk Aversion, Dan Financial Literacy Terhadap Risky Investment Intention Di Indonesia, Sekar Savira Ramadhani, Maria Ulpah, Wardatul Adawiyah

Jurnal Manajemen dan Usahawan Indonesia

This study investigates how individual factors—namely emotional intelligence, external locus of control, risk aversion, and financial literacy—affect the intention to invest in risky financial instruments in Indonesia. The research explores both the direct and indirect effects of these factors on risky investment intentions. Data were collected from 507 respondents through an online questionnaire. The findings indicate that emotional intelligence, external locus of control, and financial literacy positively influence the intention to invest in risky assets, while risk aversion has a negative effect. Additionally, the analysis of indirect effects shows that financial literacy moderates the relationship between emotional intelligence and risk …

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Life Beneath The Tides: Seagrass Meadows In Surigao Del Sur, Philippines, Giselle B. Ramos, Roxan E. Caray Jun 2025

Life Beneath The Tides: Seagrass Meadows In Surigao Del Sur, Philippines, Giselle B. Ramos, Roxan E. Caray

Journal of King Abdulaziz University: Marine Science

Seagrasses are a valuable component of global blue carbon ecosystems yet are also endangered due to natural and man-made pressures. This study assessed the seagrass resources regarding species community structure and diversity using a transect-quadrat design along the intertidal coastlines of selected towns of Surigao del Sur. Of the 19 recorded species in the Philippines, seven common species were observed: Cymodocea rotundata, Enhalus acoroides, Halodule pinifolia, Halodule uninervis, Thalassia hemprichii, Syringodium isoetifolium, and Halophila ovalis. Across study sites, the most evident species are T. hemprichii, C. rotundata, and S. isoetifolium; the existence …

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Steric Sea Level Variability Over The Red Sea, Turki Alraddadi Jun 2025

Steric Sea Level Variability Over The Red Sea, Turki Alraddadi

Journal of King Abdulaziz University: Marine Science

The current paper analyzes the steric sea level (SSL) variability over the Red Sea (RS) and linked it with climate modes namely, North Atlantic Oscillation (NAO) and East Atlantic West Russian (EAWR) patterns using a reanalysis dataset. Long-term (1993--2015) profile temperature and salinity data acquired from Simple Ocean Data Assimilation (SODA) was used to compute the SSL. The results show that the SSL is out of phase comparing to the total sea level, which may reduce fluctuations of water level within the sea. Furthermore, it accounts for only 10% of the total sea level variations. The first and second Empirical …

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Machine Learning Applications For Berth Allocation Optimization In Major Red Sea Ports: A Multi-Port Analysis, Mohammed H. Alshareef Jun 2025

Machine Learning Applications For Berth Allocation Optimization In Major Red Sea Ports: A Multi-Port Analysis, Mohammed H. Alshareef

Journal of King Abdulaziz University: Marine Science

Efficient berth allocation remains a critical challenge in Red Sea port operations, particularly given the diverse operational capabilities across the region's ports. The research utilized historical operational data from 147,892 berth allocation instances across these ports spanning 2019--2023. A deep learning model was developed using four dense layers with ReLU activation functions, incorporating vessel characteristics, weather patterns, and operational constraints. The model's performance was validated through comparison with traditional allocation methods using real-time port operation data. Port selection criteria included geographical distribution along the Red Sea, varying levels of technological adoption, and willingness to share operational data for research purposes. …

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Operating Fund Budget/ Expenditure Summary Report 2024-25, Csusb Budget Office Jun 2025

Operating Fund Budget/ Expenditure Summary Report 2024-25, Csusb Budget Office

University Budget Office records

No abstract provided.

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Physical Quality Analysis Of Ginger Yogurt With Different Types Of Ginger And Telang Flower Natural Colorant, Mazarina Devi, Soenar Soekopitojo, Arindra Nirbaya, Mansoor Abdul Hamid Jun 2025

Physical Quality Analysis Of Ginger Yogurt With Different Types Of Ginger And Telang Flower Natural Colorant, Mazarina Devi, Soenar Soekopitojo, Arindra Nirbaya, Mansoor Abdul Hamid

Bulletin of Culinary Art and Hospitality

Physical quality is a standard that must be met to ensure that new products have quality in accordance with predetermined specifications and meet consumer expectations. This study aims to analyse the quality of viscosity and colour of yoghurt drinks added with three different types of ginger, namely emprit ginger, elephant ginger, and red ginger. Telang flower was used as a natural colourant. The viscosity test of telang flower ginger yoghurt drink was measured with a viscometer and the colour of telang flower ginger yoghurt drink was measured with a colorimeter. The data obtained were then analysed with ANOVA to see …

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Innovations In Shipbuilding: A Comprehensive Review Of Material Selection, Corrosion Management, And Environmental Considerations, Oumaima Bouanani, Sara Sandabad, Moulay El Houssine Ech-Chhibat Jun 2025

Innovations In Shipbuilding: A Comprehensive Review Of Material Selection, Corrosion Management, And Environmental Considerations, Oumaima Bouanani, Sara Sandabad, Moulay El Houssine Ech-Chhibat

Journal of King Abdulaziz University: Marine Science

The shipbuilding industry, a cornerstone of global maritime operations, oversees vessel lifecycles from design through commissioning. This article delves into the industry's complex role in facilitating global trade, driving technological advancements, and prioritizing sustainability and safety. The harsh marine environment-marked by salinity, temperature extremes, and mechanical stresses-necessitates resilient and durable vessel structures. Consequently, the careful selection of materials is crucial for ensuring vessel longevity and performance under stringent safety and environmental standards. Recent breakthroughs in shipbuilding materials, including high-strength steel, composites, and lightweight alloys, have transformed the industry. Innovative solutions, such as shape memory alloys and eco-friendly composites, are designed …

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Identifying And Analysing Coastal Landforms In Ar Rāyis, Saudi Arabia: Insights From Sentinel Data And Field Studies, Omar A. Alharbi Jun 2025

Identifying And Analysing Coastal Landforms In Ar Rāyis, Saudi Arabia: Insights From Sentinel Data And Field Studies, Omar A. Alharbi

Journal of King Abdulaziz University: Marine Science

This study examines the coastal geomorphology of the Ar Rāyis coastal zone on the eastern Red Sea coastal plain, along with the processes underpinning this geomorphology. Coastal areas feature various landforms, including beaches, intertidal flats, khawrs (lagoons), sand spits, sand dunes, sabkhas (salt marshes), coral reefs, wadis, raised coral reef terraces, and alluvial terraces. These landform features suggest rapid alterations in coastal conditions. Furthermore, the analysis of Sentinel-2B data via digital processing reveals a range of natural land covers, with field investigations confirming the results. The supervised classification methods assisted in distinguishing between regions of deep and shallow water, while …

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Do They Already Know? Level Of Gender Language Sensitivity Among Education Students, Bethany P. Villanueva, Azil Jane Guingguing, Bryan Abondo, Diane Deuna, Adelyne Abrea Jun 2025

Do They Already Know? Level Of Gender Language Sensitivity Among Education Students, Bethany P. Villanueva, Azil Jane Guingguing, Bryan Abondo, Diane Deuna, Adelyne Abrea

Journal of English and Applied Linguistics

This study, conducted within a Philippine educational setting, assessed gender language sensitivity among education students. Completing two tests, the gender-neutral pronoun usage test and the gender-sensitive language test, 255 randomly selected first- and second-year students participated. Additional qualitative data was gathered through a focus group discussion. Statistical analysis using analysis of variance and Z-tests revealed no significant differences in the use of gender-neutral pronouns based on year level, program, gender identity, and preferred pronouns. However, a significant difference was observed in using gender-sensitive language based on year level and preferred pronouns. Overall, the respondents demonstrated a beginning level of proficiency …

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Estimation And Analysis Of Modernized Gps C1x Differential Hardware Delay, Mohamed Elsayed Elsobeiey Jun 2025

Estimation And Analysis Of Modernized Gps C1x Differential Hardware Delay, Mohamed Elsayed Elsobeiey

Journal of King Abdulaziz University: Engineering Sciences

The aim of this paper is to estimate and analyze the modernized signal C1X and the legacy signal C2W satellite differential hardware delay (DCBP1 - CXs). To this end, GPS data from a network consisting of 35 globally distributed IGS stations is used to estimate satellites C1C-C2W differential hardware delay (DCBP1 - C1s) using three methods. The first method is based on the direct estimation from Rinex data, the second method is based on Precise Point Positioning technique, and the third method is based on satellite clock analysis. The estimated values using …

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A Smart System For Detecting Anatomic And Histological Symptoms Of Diseased Agricultural Plants, Rustam Baratov, Himola Sunnatillayeva, Alimardon Mamatovich Mustafoqulov Jun 2025

A Smart System For Detecting Anatomic And Histological Symptoms Of Diseased Agricultural Plants, Rustam Baratov, Himola Sunnatillayeva, Alimardon Mamatovich Mustafoqulov

Chemical Technology, Control and Management

This study describes a novel agricultural plant disease detecting smart system, capable of handling measured plant body parameters and images received by high resolution camera at the same time. The proposed plant disease detection method is based on evaluation of the signals received by measured and controlled plant body physical parameters like resistance, temperature and capacitance of the plant stem and image processing. An analogue plant model based on an electrical circuit with distributed parameters was developed. In addition, in the article the block diagram of the smart system for the early detection of plant diseases, the circuit diagram, its …

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Optimisation Of Astatic Controllers In Automatic Control Systems, Isamiddin Xakimovich Siddikov, Dilnoza Maxamadjanovna Umurzakova Jun 2025

Optimisation Of Astatic Controllers In Automatic Control Systems, Isamiddin Xakimovich Siddikov, Dilnoza Maxamadjanovna Umurzakova

Chemical Technology, Control and Management

This article examines the influence of various factors on the efficiency of optimizing station controllers in automatic control systems. The main focus is on minimizing static errors and improving the reliability of controllers. Optimization methods for PID and PI2D controllers are discussed, including the use of modern approaches such as genetic algorithms. The necessity of compromise solutions to achieve high-quality system responses to various impacts is investigated. It was also suggested that there is a need for an integrated approach to setting up controllers in order to increase their reliability and flexibility in conditions of dynamically changing processes. …

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Design Of Automation For The Absorption Process In Hydrogen Purification From Carbon Dioxide, Azizbek Nodirbekovich Yusupbekov, Saidamirkhon Oripov, Diyoraxon Zokirxon Qizi Oripova Jun 2025

Design Of Automation For The Absorption Process In Hydrogen Purification From Carbon Dioxide, Azizbek Nodirbekovich Yusupbekov, Saidamirkhon Oripov, Diyoraxon Zokirxon Qizi Oripova

Chemical Technology, Control and Management

This article discusses the automation of the methanol-acetone mixture absorption process to improve control efficiency. The existing local automatic control system (ACS) was upgraded to a cascade system, reducing component concentration deviations by 12% and decreasing the transition process time from 1606 to 1592 seconds. A mathematical model of the gas absorption process was developed, incorporating material balance equations, mass transfer equations, and transfer functions. The parameters of the PI controller were calculated to ensure system stability under ±10% coefficient variations. A comparative analysis of system characteristics before and after modernization confirmed a reduction in overshoot to 0% and an …

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Determinants Of Catastrophic Health Expenditure Of Households In Indonesia, Rafa Fayza Afrizal, Novira Hasya, Faticha Putri Harda, Wildan Avif Alfathin, Vanissa Nur Latifah, Maxent Rael Nainggolan, Fadillah Rahmah Jaelani, Estro Dariatno Sihaloho Jun 2025

Determinants Of Catastrophic Health Expenditure Of Households In Indonesia, Rafa Fayza Afrizal, Novira Hasya, Faticha Putri Harda, Wildan Avif Alfathin, Vanissa Nur Latifah, Maxent Rael Nainggolan, Fadillah Rahmah Jaelani, Estro Dariatno Sihaloho

Jurnal Ekonomi Kesehatan Indonesia

The need for healthcare services due to illness is unpredictable, thus burdening patients economically and posing a risk of catastrophic events. The percentage of households with catastrophic health expenditures is defined as out-of-pocket payments exceeding 10% of the household’s capacity to pay for healthcare. Increasing catastrophic expenditure costs can further deteriorate the household’s financial condition. This study analyzes the determinants of catastrophic health expenditures in Indonesian households. A total of 12,892 household samples from the cross-sectional Indonesian Family Life Survey (IFLS) wave 5 (2014) were used in this study. Using a logistic regression model, this study aims to identify various …

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Kebijakan Cukai Konsumsi Minuman Berpemanis Dalam Kemasan (Mbdk) Dalam Mengendalikan Masalah Kesehatan: Tinjauan Literatur Sistematis Dan Meta Analisis, Risky Kusuma Hartono, Fitria Aryani Susanti Jun 2025

Kebijakan Cukai Konsumsi Minuman Berpemanis Dalam Kemasan (Mbdk) Dalam Mengendalikan Masalah Kesehatan: Tinjauan Literatur Sistematis Dan Meta Analisis, Risky Kusuma Hartono, Fitria Aryani Susanti

Jurnal Ekonomi Kesehatan Indonesia

Globally, the consumption of sugar-sweetened beverages (SSBs) has increased by nearly 16%. The imposition of taxes on sugary drinks is considered one of the strategic measures to control diseases associated with their consumption. This study aims to conduct a meta-analysis of the correlation between SSB taxation and health issues. The systematic review and meta-analysis were carried out following the Preferred Reporting Items for Systematic Reviews and MetaAnalyses (PRISMA) guidelines. Literature from various countries published since January 1, 2014, was collected using databases such as Google Scholar, PubMed, and Science Direct. The meta-analysis process was performed using a funnel plot. A …

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Development And Experimental Validation Of A Non-Invasive Blood Group Detection System, Nurath K. Nurudini Jun 2025

Development And Experimental Validation Of A Non-Invasive Blood Group Detection System, Nurath K. Nurudini

Tanzania Journal of Engineering and Technology (TJET)

An individual's blood group consists of red blood cell antigens whose composition is determined by protein presence, antigen structure, and gene series. Persons aged above six months have significant anti-A and/or anti-B in their serum. During transplantation and transfusion, ABO blood group identification is the most essential factor. The conventional method involves drawing blood samples from patients, and the blood group is determined based on the antigen-antibody reaction. This method consists of adding chemical reagents. However, this requires time of operation, and throughput analysis is high, and the process is also challenging to interpret. Accurate and rapid identification of blood …

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Towards Metrology 4.0 In Developing Countries’ Manufacturing Industries, Jailos Nzumile Jun 2025

Towards Metrology 4.0 In Developing Countries’ Manufacturing Industries, Jailos Nzumile

Tanzania Journal of Engineering and Technology (TJET)

A systematic literature review was conducted to unveil the status of the digital transformation of metrology in developing countries, as they are lagging in utilising fourth industrial revolution (IR4.0) technologies to transform manufacturing industries. A PRISMA technique was employed using various keywords to identify, screen, and select the relevant literature. Forty publications were selected for the review, mainly discussing IR 4.0 technologies in metrological operations. The results indicate that the digital transformation of metrology has yet to be initiated in developing countries. However, the employment of IR4.0 technologies in advancing metrological operations in manufacturing industries is mostly discussed in the …

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Fuzzy Logic-Based Decision Support System For Adoption Of Industry 4.0 Predictive Maintenance By Manufacturing Industries, Fred E. Peter Jun 2025

Fuzzy Logic-Based Decision Support System For Adoption Of Industry 4.0 Predictive Maintenance By Manufacturing Industries, Fred E. Peter

Tanzania Journal of Engineering and Technology (TJET)

In the context of Industry 4.0, predictive maintenance enhances operational efficiency by optimizing processes, minimizing downtime, and improving cost-effectiveness. However, implementing predictive maintenance requires a systematic approach due to its complexity. This study collected expert input from 15 food and beverage manufacturing industries located in Dar es Salaam, Tanzania, using a purposive sampling technique. Six representatives were selected from each industry, and their opinions were analyzed using MATLAB 7.6 through a fuzzy logic inference system. The analysis focused on key factors influencing Industry 4.0 technology adoption for predictive maintenance, including adoption intention (strategic decision, equipment data, perceived benefit) and perceived …

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The Role Of Internal Factors On Vehicular Mobility, Aziz Mdimi Jun 2025

The Role Of Internal Factors On Vehicular Mobility, Aziz Mdimi

Tanzania Journal of Engineering and Technology (TJET)

Vehicle mobility internal factors are influenced by the performance state of the road surface quality, governor, engine, gear train, differential unit and mobility unit. Studies on vehicular mobility models exist for off-road external factors but absent on on-road internal factors. The on-road internal factors model describes the vehicular mobility performance as a function of internal factors. In the current undertaking, results are generated by the determination of mobility performance characteristics with the application of 2nd Order Ordinary Differential Equations and using Laplace operator with MATLAB Software simulation. The effect of road surface against the time taken varies accordingly. At a …

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Towards Effective Academia-Industry Collaborations: The Case Of Higher Learning Institutions In Tanzania, Fatuma S. Ikuja Jun 2025

Towards Effective Academia-Industry Collaborations: The Case Of Higher Learning Institutions In Tanzania, Fatuma S. Ikuja

Tanzania Journal of Engineering and Technology (TJET)

Industries are the main consumers of products from higher learning institutions (HLIs); graduates for employment and research outputs for socio-economic development. Research outputs from HLIs are commercialized as services or products facilitated by academia-industry collaborations. The collaborations are expected to address mismatch between labour market needs and HLIs’ products, which has resulted in graduates’ employability challenges. Despite their importance, effective academia-industry collaborations remain challenging. This study explores the effectiveness of Academia-Industry collaborations established by HLIs in implementing the Higher Education Economic Transformation (HEET) project (2021-2026) in Tanzania. One of the project objectives is to build functional linkages between industry and …

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Energy Optimal Coverage Motion Trajectory Generation Using A Fourth-Order Motion Profile, Mathias Halinga Jun 2025

Energy Optimal Coverage Motion Trajectory Generation Using A Fourth-Order Motion Profile, Mathias Halinga

Tanzania Journal of Engineering and Technology (TJET)

Industrial machines are widely used in manufacturing sector to manufacture several products to meet customer demands. Most of these industries runs all the time throughout a day leading to high operating cost. To cut costs and satisfy customer demand for precise products, industrial machines’ motion generation is important in improving machine motion precision while using less energy. This study presents a coverage motion energy optimization which is generated by linear interpolation of each segment described by the fourth-order motion profile. The phase changes in the profile are attained with continuity of machine kinematic limits jerk, acceleration, and velocity, which are …

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Quantum Analysis Of Protein–Ligand Binding By Integrating Structural Resolution, Sequence Homology, And Ligand Properties, Don Roosan, Samira Samrose, Rubayat Khan, Saif Nirzhor, Brian Provencher Jun 2025

Quantum Analysis Of Protein–Ligand Binding By Integrating Structural Resolution, Sequence Homology, And Ligand Properties, Don Roosan, Samira Samrose, Rubayat Khan, Saif Nirzhor, Brian Provencher

Computer and Data Science Faculty Publications

Predicting protein–ligand binding affinity is a fundamental challenge in computational biology and drug discovery, complicated by diverse factors including protein sequence variability, ligand chemical diversity, and structural resolution. Here, we present an integrative study that combines classical machine learning and quantum-enhanced modeling to investigate how crystal structure resolution, sequence similarity, and ligand properties jointly influence binding affinity. Using a curated “refined” dataset from PDBbind and an expanded general dataset, we first conduct correlation and regression analyses to quantify the relationships among binding affinity, ligand descriptors (e.g., molecular weight, logP), and protein structural metrics (resolution, R-factor). We observe moderate positive correlations …

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Waterpod: Evaluating Learner Engagement And Conceptual Understanding Through Gamified Virtual Reality, Leeza Eimeria Duller Jun 2025

Waterpod: Evaluating Learner Engagement And Conceptual Understanding Through Gamified Virtual Reality, Leeza Eimeria Duller

Theses and Dissertations

The water and wastewater industry faces a growing workforce crisis due to high retirement rates, limited public awareness, and underrepresentation of technical talent. Traditional outreach methods have struggled to engage students or convey the complexity of water systems. This study evaluates WaterPOD, an interactive virtual reality (VR) simulation designed to introduce users to wastewater treatment processes and careers through immersive learning. Grounded in Social Cognitive Career Theory (SCCT), Cognitive Load Theory (CLT), and Constructivist Learning Theory (ConLT), the study examined how VR influences conceptual understanding and career perceptions. A mixed-methods study with 138 college students measured SCCT constructs, CLT- and …

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Compact Space-Folded Multi-Resonator Duct Silencer With Broadband Noise Reduction And Minimal Flow Disturbance, Joshua Lloyd Jun 2025

Compact Space-Folded Multi-Resonator Duct Silencer With Broadband Noise Reduction And Minimal Flow Disturbance, Joshua Lloyd

Theses and Dissertations

Control and reduction of unwanted noise is a significant concern in many residential, commercial, and industrial fields. Specifically, ducted noise control is of increasing importance due to the complex challenges of ventilation requirements imposed on the system. This research presents a compact, space-folded silencer which achieves broadband attenuation of noise in ducted applications. Making use of axial arrays of side- loaded resonators, this structure allows for unobstructed fluid-flow through its center, resulting in a static fluid pressure drop across the device of only 14.5 Pa. In addition, due to the silencer’s configurable nature, the geometry can be tuned to meet …

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Towards Future Sustainable Infrastructure: The Role Of Technical Audit In Tanzania’S Public Works, George C. Haule Jun 2025

Towards Future Sustainable Infrastructure: The Role Of Technical Audit In Tanzania’S Public Works, George C. Haule

Tanzania Journal of Engineering and Technology (TJET)

This study aimed to investigate the vital role and impact of technical audits in promoting sustainable infrastructure development in Tanzania. The role and effects of technical audits in long-term infrastructure development were studied using a mixed-methods approach with both quantitative and qualitative parts. Data were collected through analysis of technical audit documentation, a semi-structured questionnaire, and stakeholder interviews. The study revealed the various dimensions of infrastructure investment projects, including initiation and planning, design, procurement of contractors and consultants, contract management, environment, health, and safety. The technical audit findings reported weaknesses or non-performance issues in infrastructure planning at the national level …

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Wet Gas Metering Performance Using Conventional Flow Measurement Devices, Vitali Mwinyi Jun 2025

Wet Gas Metering Performance Using Conventional Flow Measurement Devices, Vitali Mwinyi

Tanzania Journal of Engineering and Technology (TJET)

The demand for and production of natural wet gas from wells has significantly risen in recent years. Although natural gas liquids hold substantial value in the oil and gas market, their presence in wet gas adversely affects gas metering, leading to overreading during measurement. A comprehensive study has been undertaken to formulate and enhance correlations for rectifying overreading in wet gas metering. Nevertheless, most current correlations are designed for horizontal configurations of traditional meters. Mitigating this constraint is crucial to consider the impact of gravity on pressure loss in vertically oriented systems. This study seeks to evaluate the efficacy of …

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Fuzzy-Ahp Based Decision Support System For The Selection Of Optimal Maintenance Strategy For Meter Gauge Railway Infrastructure: A Review, Hamisi J. Maulid Jun 2025

Fuzzy-Ahp Based Decision Support System For The Selection Of Optimal Maintenance Strategy For Meter Gauge Railway Infrastructure: A Review, Hamisi J. Maulid

Tanzania Journal of Engineering and Technology (TJET)

There are many uncertainties and complexities associated with maintaining Meter Gauge Railway (MGR) infrastructure, which calls for a methodical approach to decision-making. The development and application of a fuzzy-AHP-based decision support system (DSS) to select the optimal maintenance strategy for the MGR are presented in this study. The review covers research from 2013 to 2023 and focusses on the use of Multi-Criteria Decision Making (MCDM) and Fuzzy Analytic Hierarchy Process (Fuzzy-AHP) techniques in railway infrastructure maintenance. To manage the inherent uncertainties and subjective judgements involved in maintenance decision-making, the Fuzzy-AHP methodology combines fuzzy logic with the Analytic Hierarchy Process (AHP). …

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