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Articles 52561 - 52590 of 1114206
Full-Text Articles in Entire DC Network
Understanding The Through-Space Intermolecular Interactions Of Isothiourea Catalysts In Acylation/Silylation Reactions Of Secondary Alcohols, Ziyuan Gong
Theses and Dissertations
Through space interactions, including cation-π interaction, lone pair-πinteraction, steric hinderance etc. play a central role in organocatalytic reaction. They can control the reactivity or the selectivity of an organic reaction. Previous work in our group has already shown that the chiral isothiourea compounds can catalyze the acylation as well as silylation reaction of secondary alcohol with the possible cation-πinteraction between the catalyst and substrate. However, there is lack of study to understand how the delocalization of the positive charge would affect the reaction rate and whether some unexpected inter- or intramolecular interaction could help stabilize …
Explorations Of Multi-Carboranyl Thiols And Phosphines, Jared Ross Riffle
Explorations Of Multi-Carboranyl Thiols And Phosphines, Jared Ross Riffle
Theses and Dissertations
In order to ascribe the impact of substituent groups on the bis-ortho-carborane, closo-{C2B10}-closo-{C2B10} multi-cluster system, the first sulfur-containing biscarborane derivatives were synthesized. Biscarborane dithiol, disulfide, bis(methyl)thioether, as well as multiple dithiolate salts were structurally characterized. The exceedingly long C–C bonds and shortened C–S bonds in biscarborane dithiol and its doubly deprotonated dithiolate salts are indicative of significant delocalization of electron density from the sulfur atoms into the cluster. Additionally, a new concept of ligand ambiphilicity is described where, instead of the involvement of only a single center in a ligand, this amphiphilicity relies on the redox behavior of the indirectly …
Investigating The Use Of Socio-Scientific Issues As Phenomena Through A Storyline Framework In A High School Biology Course, Dana Marie Delpha
Investigating The Use Of Socio-Scientific Issues As Phenomena Through A Storyline Framework In A High School Biology Course, Dana Marie Delpha
Theses and Dissertations
This action research dissertation investigates the efficacy of a socio-scientific phenomena-driven biology curriculum in a Title 1 Massachusetts High School. Grounded in social constructivism, culturally relevant pedagogy, and self-determination theories, the study explores the impact of socio-scientific phenomena on students’ perceived importance of science education, motivation, engagement, and achievement. A mixed-methods approach was used, and data was collected through student engagement reflection, Science Motivation Questionnaire, and pre- and post-assessments to holistically evaluate the efficacy of the curriculum. The findings include increased student engagement, motivation, and achievement after participating in the intervention, which supports the motivation-engagement-achievement feedback loop. Student agency was …
Dr-4429: Social Perceptions And Narratives Of The 2019 Mississippi Delta Flood, Lily B. Langstaff
Dr-4429: Social Perceptions And Narratives Of The 2019 Mississippi Delta Flood, Lily B. Langstaff
Honors Theses
This thesis examines the social perceptions and narratives surrounding the 2019 Mississippi Delta flood. Recognizing flooding as a “wicked problem,” the research highlights how socioeconomic and cultural identities relate to access to resources and assistance for affected communities, with an emphasis on infrastructure. Through qualitative analysis, including thematic coding of journalistic media sources covering the flood, the study explores the perceptions and experiences as well as the concept of ‘deservingness’ and its relationship with government resources and assistance. Findings indicate that the Mississippi Delta community faced temporal barriers to post-flood recovery due to disparities in representation and perception, underscoring the …
Can Chaperones Promote Protein Splicing?, Hazel Thomas
Can Chaperones Promote Protein Splicing?, Hazel Thomas
Honors College Theses
Inteins are a mobile genetic element hypothesized to function as regulatory molecules in microbes. They bear a homing endonuclease domain for genome traversal, as well as specific residues allowing for protein splicing. In the protein splicing reaction, the intein is removed and the flanking residues, termed exteins, are ligated together with a peptide bond to form a functional host protein. Due to their interruption prior to splicing, inteins prevent a host protein from functioning until the intein ligates the two exteins. To measure factors that regulate protein splicing in vivo, an intein-based biosensor based on kanamycin resistance (K …
Cellulose Recovery From Waste Denim Fabrics Through Indigo Vat Dye Reduction And Spandex Dissolution, Tito N. Venance
Cellulose Recovery From Waste Denim Fabrics Through Indigo Vat Dye Reduction And Spandex Dissolution, Tito N. Venance
Tanzania Journal of Engineering and Technology (TJET)
This study addresses environmental conservation by tackling end-of-life management for post-consumer denim garments through the recycling of cotton fibres from waste denim. The purification process involved dithionite reduction of vat dyes in the presence of an alkali followed by selective dissolution of spandex using N,N-dimethylformamide (DMF). Optimal conditions for dye removal were determined at 90°C for 120 minutes with sodium hydroxide at 25 g/L, sodium dithionite at 6 g/L and PVP at 4.5 g/L, while spandex extraction was achieved using a 5% DMF solution at 70°C for 4 hours. Ultraviolet (UV)-vis spectrophotometric analysis indicated a significant increase in whiteness (DL*). …
A Fuzzy Based Framework For Sustainable Technology Selection In Small-Scale Gold Mining Operations, John M. Kafuku
A Fuzzy Based Framework For Sustainable Technology Selection In Small-Scale Gold Mining Operations, John M. Kafuku
Tanzania Journal of Engineering and Technology (TJET)
Small-scale gold mining (SSGM) operations in Tanzania has been operating inefficiently due to inadequate mining processing technologies, poor working tools, lack of enough capital, and insufficient electricity. Despite the efforts made by different stakeholders in boosting the sustainability of SSGM yet the sector has not reached the expected goal. This paper proposes a framework for appropriate technology selection to help small scale gold miners in evaluating various gold mineral processing technologies. The framework utilizes the fuzzy logic set theory for technology evaluation and selection. The developed framework for technology selection upon validation provided results that technology adequacy of more than …
Microwave Ore Pre-Treatment Review And Process Flowsheet Conceptualization, Baker F. Giyani
Microwave Ore Pre-Treatment Review And Process Flowsheet Conceptualization, Baker F. Giyani
Tanzania Journal of Engineering and Technology (TJET)
The global demand for mineral commodities has increased dramatically over the years, and this is largely due to several factors, including technological advancements, industrialization, and a rise in population. Further, the demand keeps increasing because the ore being mined is becoming more complex, and the feed grade is declining over the years, prompting the need for innovative technologies to treat such ores more efficiently. Microwave ore pre-treatment is one of the potential technologies that can be employed to improve process performance. This is possible because ores are composed of both good-microwave heaters and poor microwave heaters, which creates thermal stresses …
Assessment Of Factors Contributing On Early Rotting Of Chromated Copper Arsenate Treated Utility Power Distribution Wood Poles In Tanzania, Innocent J. Macha
Assessment Of Factors Contributing On Early Rotting Of Chromated Copper Arsenate Treated Utility Power Distribution Wood Poles In Tanzania, Innocent J. Macha
Tanzania Journal of Engineering and Technology (TJET)
The study aimed to assess the factors contributing to the premature decay of Chromated Copper Arsenate (CCA) treated utility power distribution wooden poles in Tanzania. Deteriorated poles samples from various regions in Tanzania were analyzed using handheld X-ray spectrometry to quantify the retention of CCA preservative chemicals. The ages of these poles were estimated based on annual growth rings. The findings indicated that premature failure of CCA treated wooden poles is attributed to an imbalance in the chemical composition of the preservative solution. The study found that CuO retention in most samples ranged between 10-18 kg/m3, significant lower that the …
Compensating Regulatory Losers, Todd S. Aagaard
Compensating Regulatory Losers, Todd S. Aagaard
Faculty Publications
Every change in government regulation creates benefits and burdens that fall unequally on the population. This unequal distribution raises the question of whether fairness requires compensating those who bear regulatory costs—what is known as the “compensation problem.” The extensive body of scholarship addressing the compensation problem tends to focus only on the burdens of regulatory compliance and ignores the burdens of injuries left unaddressed by regulation. The effect of this differential treatment is to treat past regulatory windfalls as permanent entitlements and to omit from the analysis equally deserving regulatory losers who have suffered the consequences of unregulated harms. This …
A Path For A Post-Oil Iraq: A Green Transition Strategy To Prepare Iraq For Climate Change, Jason Edward Harsha
A Path For A Post-Oil Iraq: A Green Transition Strategy To Prepare Iraq For Climate Change, Jason Edward Harsha
Departmental Honors & Graduate Capstone Projects
Due to resource scarcities from climate change, Iraq needs to reconfigure it's economic policy to resolve them. It needs to have an export model that is diversified from oil due it's weakness as a valuable export. Oil is vulnerable to price shocks and decreased demand from global energy transitions. Instead, Iraq should build knowledge intensive industries that create multiple valuable products to earn the revenue to import scarce resources. This can be attained with a just transition strategy that implements a energy transition while protecting the working class. A energy transition needs policies that lower the relative cost of renewable …
The Revolving Door Of Industry Standards, Zachary Kester, Spencer Rehn
The Revolving Door Of Industry Standards, Zachary Kester, Spencer Rehn
St. Mary's Law Journal
No abstract provided.
Water As A Natural Souvenir, Grace Winningham
Water As A Natural Souvenir, Grace Winningham
Journal of Contemporary Water Research and Education
This research note explores the significance of natural souvenirs in tourism, emphasizing their contribution to cultural and environmental sustainability. Through a mixed-methods approach including a literature review and oral histories, the study examines how natural souvenirs, particularly water-based ones, foster souvenir-person-place bonding, enhance destination branding, and promote sustainable tourism practices. The findings highlight the unique and authentic nature of water souvenirs, which serve as powerful reminders of travel experiences and strengthen emotional connection to destinations. Additionally, the study discusses the role of natural souvenirs in differentiating destinations, leveraging unique attributes for branding, and stimulating interest through word-of-mouth marketing. Also addressed …
Improving Image Quality In Electrical Capacitance Tomography Using Otsu Thresholding, Josiah Nombo
Improving Image Quality In Electrical Capacitance Tomography Using Otsu Thresholding, Josiah Nombo
Tanzania Journal of Engineering and Technology (TJET)
Electrical Capacitance Tomography (ECT) is an imaging technique used in industrial process monitoring, particularly for monitoring and measuring the composition of multiphase flows. Despite its widespread application, the commonly used Linear Back Projection (LBP) algorithm often produces low-quality images due to its limited ability to handle high permittivity contrasts and nonlinearities. This study investigates the use of Otsu thresholding as a post-processing technique to enhance ECT image quality. By maximizing inter-class variance in the image histogram, Otsu thresholding improves contrast, clarity, and structural definition, enabling more effective segmentation of oil and gas components in multiphase flows. The proposed Otsu-based reconstruction …
Baseer: A Drone-Based System Leveraging Facial And Pattern Recognition For Efficient Real-Time Child Recovery, Afraa Attiah, Abeer Hakeem
Baseer: A Drone-Based System Leveraging Facial And Pattern Recognition For Efficient Real-Time Child Recovery, Afraa Attiah, Abeer Hakeem
Journal of King Abdulaziz University: Computing and Information Technology Sciences
The loss of a child is a profound event that poses substantial emotional, psychological, and logistical challenges for families. Conventional child recovery methods, like search parties and media campaigns, often falter due to delayed responses, limited outreach, and ineffective data management. These methods struggle to handle vast information or employ modern tools efficiently. In response, this study introduces Baseer, a system merging drone technology with AI to enhance the efficacy of locating missing children. Baseer utilizes drones with high-resolution imaging systems for rapid aerial surveillance, expanding search capabilities beyond standard ground-based approaches. AI algorithms analyze real-time images for automated identification …
Iot Resource Management Based On The Sparrow Search Algorithm In Healthcare Applications, Entisar Alkayal, Nesreen M. Alharbi
Iot Resource Management Based On The Sparrow Search Algorithm In Healthcare Applications, Entisar Alkayal, Nesreen M. Alharbi
Journal of King Abdulaziz University: Computing and Information Technology Sciences
Healthcare applications, such as remote patient monitoring systems (RPMSs), utilize various Internet of Things (IoT) devices, including headsets, pulse oximeters, EEG monitors, ECG monitors, and smartwatches, to remotely gather critical patient data, such as heart rate, body temperature, and blood pressure. This technology enables healthcare professionals to collect patient information without needing in-person visits, streamlining data collection. Once the data is collected, these IoT devices transmit the information to smartphones, which serve as edge devices. Given the limited processing capabilities of smartphones, data preprocessing is necessary before transferring the data to the fog layer, where it can be analyzed using …
Determining Patterns Of Instructors’ Usage Of Blackboard Features Using A Clustering Technique, Maryam A. Alamoudi, Arwa A. Allinjawi
Determining Patterns Of Instructors’ Usage Of Blackboard Features Using A Clustering Technique, Maryam A. Alamoudi, Arwa A. Allinjawi
Journal of King Abdulaziz University: Computing and Information Technology Sciences
Learning Management Systems (LMSs), such as Blackboard, have been shown to be valuable for online teaching and learning activities. They offer many tools for students and instructors. Moreover, they can track and record users’ activities, which can be analyzed using data mining techniques. The success of LMSs depends heavily on instructors because they typically initiate the activities and encourage the students to use LMSs. However, several studies indicate that instructors’ use of LMS features is often limited. This study aimed to identify the patterns of instructors’ usage of Blackboard features using a clustering technique. The experiment was conducted at King …
Developer Analytics: A Novel Approach To Analyzing Developer Performance Through Football Comparisons, Ahmed Harbaoui, Waseem Ahmed
Developer Analytics: A Novel Approach To Analyzing Developer Performance Through Football Comparisons, Ahmed Harbaoui, Waseem Ahmed
Journal of King Abdulaziz University: Computing and Information Technology Sciences
This article explores a novel approach to evaluating developer performance and software quality by drawing parallels between programmers and football players. We highlight the inefficiencies in current assessment methods, which often rely on years of experience rather than quantitative metrics that truly reflect a developer's capabilities. By examining the historical evolution of both fields, we identify the significant advancements in performance analysis in football, which are rooted in statistical data. We propose a framework for developer analytics that utilizes performance metrics derived from programming contests, allowing for a more nuanced classification of programmers based on their skills and roles. Our …
Deep Learning Model With Hybrid Resampling Technique For Electricity Theft Detection In Smart Grid, Fawzia Algarni, Laila Nassef, Nahed Alowidi
Deep Learning Model With Hybrid Resampling Technique For Electricity Theft Detection In Smart Grid, Fawzia Algarni, Laila Nassef, Nahed Alowidi
Journal of King Abdulaziz University: Computing and Information Technology Sciences
Electricity theft is a serious problem that results in significant revenue losses and jeopardizes economic stability. The accurate detection of theft is hindered by the prevalence of imbalanced, real-world electricity consumption datasets. Consequently, data balancing is necessary prior to the classification of normal and abnormal consumers in order to mitigate the classifier’s inherent biases toward the majority class. This study proposes a deep learning–based electricity theft detection model coupled with a hybrid resampling technique (synthetic minority over-sampling technique–edited nearest neighbor (SMOTEENN)). This hybrid technique resolves the bias problem in classifying the imbalanced data, reduces the risk of overfitting, and preserves …
Um Engineers Develop Wearable Heart Attack Detection Tech, Clara Turnage
Um Engineers Develop Wearable Heart Attack Detection Tech, Clara Turnage
University of Mississippi News
OXFORD, Miss. – Every second counts when it comes to detecting and treating heart attacks. That's where a new technology from the University of Mississippi may come in to identify heart attacks faster and more accurately than traditional methods.
Opportunities And Challenges Of Land Sale And Purchase Agreement Transactions In The Digital Era In Indonesia, Sanusi Sanusi, Bha’Iq Roza Rakhmatullah, Erwin Aditya Pratama, Fajar Dian Aryani, Muhammad Wildan
Opportunities And Challenges Of Land Sale And Purchase Agreement Transactions In The Digital Era In Indonesia, Sanusi Sanusi, Bha’Iq Roza Rakhmatullah, Erwin Aditya Pratama, Fajar Dian Aryani, Muhammad Wildan
Indonesia Law Review
In this digital era, technology has changed many aspects of life. Land purchase agreements in Indonesia, which were previously carried out conventionally, have begun to shift to digital platforms. Digitalization in land purchase agreements offers various opportunities, but this process also has a number of challenges that need to be overcome to ensure that land purchase transactions can be carried out efficiently and safely, providing legal protection to buyers. The formulation of the problem in this study is how the challenges and opportunities of land purchase agreement transactions in the digital era in Indonesia and how legal protection is provided …
The Regulatory Void Of Pfas And Contaminated Sites, Irem Tekogul, David Lampert, Farzad Mohammadi, Amandeep K. Sandhu, Matthew Shapiro
The Regulatory Void Of Pfas And Contaminated Sites, Irem Tekogul, David Lampert, Farzad Mohammadi, Amandeep K. Sandhu, Matthew Shapiro
Journal of Contemporary Water Research and Education
Per- and polyfluoroalkyl substances (PFAS), often referred to as “forever chemicals,” are widely used due to their unique properties. The adverse health impacts of PFAS have been available for the last two decades, but the persistence of inadequate and poorly enforced regulations has led to pervasive environmental contamination. Recent regulatory changes by the U.S. Environmental Protection Agency address PFAS in drinking water under the Safe Drinking Water Act and address PFAS in contaminated sites under the Comprehensive Environmental Response, Compensation, and Liability Act. However, regulatory gaps persist, particularly regarding acceptable risks from sites contaminated with thousands of PFAS. This paper …
Innovative Circular Business Model As A Tool For Applying Rational Consumption Of The Natural Resource Landscape, Nataliia Gavkalova, John Martin, Nadiia Shmygol
Innovative Circular Business Model As A Tool For Applying Rational Consumption Of The Natural Resource Landscape, Nataliia Gavkalova, John Martin, Nadiia Shmygol
Professional Services
Economic growth within the traditional linear production model increases environmental pressure, depleting resources, and raising pollution levels. In contrast, the circular economy promotes closed production cycles, ensuring the repeated use of extracted resources. However, transitioning to this model requires active innovation adoption. Despite its rising popularity, circular economy concepts remain underdeveloped scientifically, lacking formulated models that comprehensively address implementation in both public and private sectors. This study aims to theoretically and practically substantiate the development of an innovative circular business model as a tool for rational natural resource consumption. Achieving this requires a multidisciplinary approach, integrating business models, technological innovations, …
Interview With Juneau Rowe, Juneau Rowe, Jessica Oliva
Interview With Juneau Rowe, Juneau Rowe, Jessica Oliva
Heritage Musics Interviews
Juneau Rowe is a musician, educator, and multimedia creative who performs with the BASSment band and teaches piano through Palenke Arts in the Monterey Bay area. In the interview, Rowe discusses becoming involved with Palenke Arts and supporting its mission of multicultural arts education and creative community-building. The interview includes reflections on the BASSment’s socially conscious hip-hop, perspectives as a trans artist, and the role of live music in sharing stories, strengthening cultural understanding, and connecting audiences. Rowe also emphasizes protecting access to arts programs and helping students develop creativity, confidence, and the ability to apply themselves through music.
Human Rights For The Twenty-First Century, Marcus Moore
Human Rights For The Twenty-First Century, Marcus Moore
All Faculty Publications
In this article, I explore the way that traditionally dominant conceptions of human rights have been rendered inadequate in the 21st century through the example of contemporary threats to the freedom of thought arising from the Information Revolution. The sequence of the article is: an initial section provides background on freedom of thought as one of the most fundamental but overlooked of human rights, and reflects on the myriad ways in which it is imperiled by processes enabled or amplified by the current Age of Information. I then draw on this example to demonstrate why it is vital to move …
Pengembangan Modul Pembelajaran Ips Berbasis Outdoor Learning Media Peta Harta Karun Kelas Viii Smp, Evrilia Dwiyanti, Djoko Soelistijo
Pengembangan Modul Pembelajaran Ips Berbasis Outdoor Learning Media Peta Harta Karun Kelas Viii Smp, Evrilia Dwiyanti, Djoko Soelistijo
Journal of Innovation and Teacher Professionalism
Penelitian ini bertujuan untuk mengembangkan dan menghasilkan modul pembelajaran IPS berbasis outdoor learning dengan bantuan media PHK (Peta Harta Karun) pada materi perkembangan kerajaan Islam di Indonesia. Tujuan ini didasarkan pada hasil analisis yang menunjukkan bahwa siswa merasa bosan dengan pembelajaran konvensional dan beranggapan bahwa materi IPS hanya sekadar hafalan di kelas, sehingga membuat mereka jenuh dan kurang termotivasi. Dalam konteks ini, diperlukan perencanaan pembelajaran yang inovatif dalam penggunaan PHK agar dapat mencapai tujuan pembelajaran secara efektif dan sesuai dengan karakteristik siswa yang beragam. Penelitian ini menggunakan metode Research and Development (R&D) dengan model ADDIE dalam tahap awal, analisis dilakukan …
Minutes From April 30 2025, University Senate
Minutes From April 30 2025, University Senate
University Senate Minutes
Minutes from April 30 2025 University Senate Meeting
Influence Of Substrate Temperature On The Properties Of Reactive Dc Magnetron Co-Sputtered Ag-Doped Tio2 Thin Films, Hezekiah B. Sawa
Influence Of Substrate Temperature On The Properties Of Reactive Dc Magnetron Co-Sputtered Ag-Doped Tio2 Thin Films, Hezekiah B. Sawa
Tanzania Journal of Engineering and Technology (TJET)
This study reports on the influence of substrate temperature on the properties of Ag-doped TiO2 thin films. The films were deposited by reactive DC co-sputtering of Ti and Ag targets at different substrate temperatures and Ag target sputtering powers. Grazing incident X-ray diffractometer confirmed that all films were polycrystalline with dominant peak oriented along (101) planes representing the anatase TiO2 phase. The average grain size of the samples improved with increase in deposition temperature. At a substrate temperature of 450 ℃, the samples had a dominant peak representing the rutile phase, suggesting partial transformation from anatase to rutile phase. The …
A Critical Realist Erp Implementation In Zimbabwean Mining Industry Organisations, Jairos Mukwenha
A Critical Realist Erp Implementation In Zimbabwean Mining Industry Organisations, Jairos Mukwenha
Tanzania Journal of Engineering and Technology (TJET)
This research uses a critical realist framework to examine the factors influencing the success of enterprise resource planning (ERP) system implementation in Zimbabwean mining industry organisations. From the perspective of critical realism, the mining industry in Zimbabwe faces a complex interplay of opportunities and obstacles while implementing ERP systems. The deployment of ERP in mining firms is critically examined in this paper, emphasising how these systems might improve operational efficiency while considering Zimbabwe's particular socioeconomic circumstances. By exploring underlying structures, mechanisms, and outcomes, the research aims to identify critical challenges and opportunities and develop practical recommendations for improving ERP adoption …
Development Of A Microcontroller-Based Intelligent Traffic Light Control System For Vehicular Movement In T-Junctions, Frederick O. Ehiagwina
Development Of A Microcontroller-Based Intelligent Traffic Light Control System For Vehicular Movement In T-Junctions, Frederick O. Ehiagwina
Tanzania Journal of Engineering and Technology (TJET)
This research is devoted to the issue of regulating traffic congestion in major cities using light-dependent resistors coupled with the PIC16F877A microcontroller. This study proposes an intelligent traffic control system for T-Junctions, utilizing sensing and control to optimize traffic flow through dynamic phase adjustments and congestion reduction, enabled by a microcontroller-based decision-making system. The proposed system reduces traffic congestion, automates control, and enhances safety, minimizing accidents and lowering infrastructure costs. Under simulated environment, it demonstrates an average response time of 50 ms and achieves 99% accuracy in displaying the correct countdown. Finally, the number of state transitions handled per minute …