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Articles 10471 - 10500 of 302421

Full-Text Articles in Physical Sciences and Mathematics

Blended Learning In The Wake Of Ict Infrastructure Deficiencies: The Case Of A Zimbabwean University, Lucia Makwasha, Sam Jnr Takavarasha, Hazel Mubango Sep 2023

Blended Learning In The Wake Of Ict Infrastructure Deficiencies: The Case Of A Zimbabwean University, Lucia Makwasha, Sam Jnr Takavarasha, Hazel Mubango

African Conference on Information Systems and Technology

In the wake of debates between actors in the Zimbabwean higher education sector about the effectiveness of e-learning models, it is important to investigate the effectiveness of using blended learning at a time when infrastructure challenges are disrupting ICT access. This paper aims to address this quest for a deeper understanding by investigating students' perceptions of blended learning at a selected Zimbabwean university. Twelve in-depth interviews were conducted with students from a Zimbabwean university that employs blended learning under an interpretivist paradigm. Vygotsky's Zone of Proximal Development (ZPD) was used for conceptualising students' cognitive development and Engestrom's (2003) Third-generation Activity …

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Factors Influencing User Adherence Towards Privacy Standards Of Internet Of Things Devices, Philip Bazanye, Walter Uys, Wallace Chigona Sep 2023

Factors Influencing User Adherence Towards Privacy Standards Of Internet Of Things Devices, Philip Bazanye, Walter Uys, Wallace Chigona

African Conference on Information Systems and Technology

The upsurge in the use of Internet of things (IoT) devices increases the likelihood of cyber-attacks on end users. The objective of the study reported here was to investigate the factors that influence IoT device users’ adherence to privacy standards. This interpretivist exploratory research was guided by a three-phased approach using activity theory. The interview questions were derived from the conceptual model and themes analysed using deductive thematic analysis. The findings indicate that a lack of adherence is driven by a lack of trust in IoT devices and service providers, as well as convenience and health factors. In addition, users’ …

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Approaches To Assessing Nutrient Coupling In Open Ocean Datasets, James M. Moore, Claire P. Till Sep 2023

Approaches To Assessing Nutrient Coupling In Open Ocean Datasets, James M. Moore, Claire P. Till

IdeaFest: Interdisciplinary Journal of Creative Works and Research from Cal Poly Humboldt

Nutrient coupling describes a process where the biogeochemical cycles of two elements are linked by being incorporated similarly into biomass. This paper uses data from the GEOTRACES GP16 cruise (Eastern Pacific Zonal Transect) to investigate the relationship between certain macronutrients generally coupled to trace elements in terms of their oceanic distributions with the notable exception of in an oxygen minimum zone: cadmium-phosphate and zinc-silicate. There are many methods applied to oceanographic data to correlate analyte concentrations; while they are often presented independently in literature, here we attempt to use them in conjunction for a more thorough interpretation. By compiling 1) …

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Social Media & Privacy: Understanding Privacy In The Age Of Content Creator Culture, Robert Tagoe, Raphael Amponsah, Emmanuel Awuni Kolog, Eric Afful-Dadzie Sep 2023

Social Media & Privacy: Understanding Privacy In The Age Of Content Creator Culture, Robert Tagoe, Raphael Amponsah, Emmanuel Awuni Kolog, Eric Afful-Dadzie

African Conference on Information Systems and Technology

In today's digital age, content creators are gaining public attention and becoming highly influential. With that increased influence, it is important to acknowledge the privacy concerns within this culture. This interpretive research study seeks to identify and understand the dynamics of privacy within the content creator culture. This research will leverage information from interviews with content creators from various social media platforms such as YouTube, Instagram, Facebook, and TikTok. Using theories to understand the phenomena, theories of privacy calculus, privacy paradox and self-disclosure, will be used to view how content creators define and navigate privacy, strategies employed to control personal …

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Digital Transformation In Government: A Bibliometric Scoping Of African Aspirations And The Realities, Hossana Twinomurinzi, Sibukele Gumbo Sep 2023

Digital Transformation In Government: A Bibliometric Scoping Of African Aspirations And The Realities, Hossana Twinomurinzi, Sibukele Gumbo

African Conference on Information Systems and Technology

African countries have persistently ranked poorly in the United Nations E-Government Development index (EGDI). This study therefore sought to make sense of the nature and form of digital transformation (DX) in African governments. It used a bibliometric analysis and a critical realist lens to explore some of the underlying structures and generative mechanisms that influence DX. The key findings from 606 scholarly publications over the three decades of DX research reveals marked sharp contrasts, with South Africa dominating the research on DX, an underrepresentation of DX research from most African nations, and some influence from non-African nations, particularly the United …

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Codesigning A Big Data Analytic Tool For Girl Child Learner Drop Out From Eastern Cape Province -South Africa, Nobert Rangarirai Jere, Nosipho Carol Mavuso, Nelly Sharpley Sep 2023

Codesigning A Big Data Analytic Tool For Girl Child Learner Drop Out From Eastern Cape Province -South Africa, Nobert Rangarirai Jere, Nosipho Carol Mavuso, Nelly Sharpley

African Conference on Information Systems and Technology

Developing sustainable solutions is critical for adoption of digital solutions. As the high number of learners dropping out of school continues to increase, it is critical to find innovative ways of predicting and preventing high drop out. Current literature has documented a number of factors that influence learner drop out. Innovative ideas, techniques and activities have been undertaken to motivate learners to stay at school. It is unfortunate that most of the initiatives have not helped to avoid drop out of learners. The study is based on a mixed approached that was used targeting female learns from Oliver Tambo District …

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Methane Dynamics Of Kentucky Bottomland Hardwood Forested Systems, Marissa Miles, Jessica B. Moon, Skylar Ross, Jarred Asselta, Niklas Klauss, Rosie Carey, Kabi Raj Khatiwada, Bassil El Masri, Gary Stinchcomb, Benjamin R. K. Runkle Sep 2023

Methane Dynamics Of Kentucky Bottomland Hardwood Forested Systems, Marissa Miles, Jessica B. Moon, Skylar Ross, Jarred Asselta, Niklas Klauss, Rosie Carey, Kabi Raj Khatiwada, Bassil El Masri, Gary Stinchcomb, Benjamin R. K. Runkle

Kentucky Water Resources Annual Symposium

No abstract provided.

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Floating Vegetation As A Driver Of Ch4 Emissions In Small Ponds Across Louisville, Ky, Mark Tierney, C. Jalink, J. H. Loughrin, S. W. Antle, Andrew S. Mehring Sep 2023

Floating Vegetation As A Driver Of Ch4 Emissions In Small Ponds Across Louisville, Ky, Mark Tierney, C. Jalink, J. H. Loughrin, S. W. Antle, Andrew S. Mehring

Kentucky Water Resources Annual Symposium

No abstract provided.

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Measuring The Contribution Of Bald Cypress “Knees” To Greenhouse Gas Emissions During Climate Extremes, Skylar Ross, Jessica B. Moon, Niklas Klauss, Marissa Miles, Kabi Raj Khatiwada4, Bassil El Masri, Gary Stinchcomb, Benjamin R. K. Runkle Sep 2023

Measuring The Contribution Of Bald Cypress “Knees” To Greenhouse Gas Emissions During Climate Extremes, Skylar Ross, Jessica B. Moon, Niklas Klauss, Marissa Miles, Kabi Raj Khatiwada4, Bassil El Masri, Gary Stinchcomb, Benjamin R. K. Runkle

Kentucky Water Resources Annual Symposium

No abstract provided.

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Characterizing Louisville Wetlands From Above And Below To Better Predict Wetland Carbon Sink-Source Status, Andrea E. Gaughan, Andrew S. Mehring, Mark Tierney, David Brown, Kassidy Haynes, Madison Cicha Sep 2023

Characterizing Louisville Wetlands From Above And Below To Better Predict Wetland Carbon Sink-Source Status, Andrea E. Gaughan, Andrew S. Mehring, Mark Tierney, David Brown, Kassidy Haynes, Madison Cicha

Kentucky Water Resources Annual Symposium

No abstract provided.

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Paleokarst Coastal Caves At Torricelle Hills (Lessini Mountains, Venetian Prealps, Italy), Guido Gonzato, Enrico Borghi, Roberto Chignola, Nereo Preto, Guido Rossi Sep 2023

Paleokarst Coastal Caves At Torricelle Hills (Lessini Mountains, Venetian Prealps, Italy), Guido Gonzato, Enrico Borghi, Roberto Chignola, Nereo Preto, Guido Rossi

International Journal of Speleology

This paper describes a set of paleokarst caves at Torricelle Hills near Verona (Southern Alps, Italy.) At this locality, erosional surfaces and paleokarst cavities show that sedimentation of late Paleogene neritic limestones was interrupted by subaerial exposure. Karst features developed during a phase of marine regression that started after the early Oligocene and ended in the mid Miocene. These caves were originally completely filled by iron oxides- and hydrated oxides-rich paleosol sediments (ochre) that, for centuries, have been mined for pigments. Mining activity emptied the caves, leaving the voids and related shapes mostly intact; as a result, the original morphologies …

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Elevated Risk Of Compound Extreme Precipitation Preceded By Extreme Heat Events In The Upper Midwestern United States, Manas Khan, Rabin Bhattarai, Liang Chen Sep 2023

Elevated Risk Of Compound Extreme Precipitation Preceded By Extreme Heat Events In The Upper Midwestern United States, Manas Khan, Rabin Bhattarai, Liang Chen

Department of Earth and Atmospheric Sciences: Faculty Publications

Compound extreme events can potentially cause deadlier socio-economic consequences. Although several studies focused on individual extreme climate events, the occurrence of compound extreme events is still not well studied in the upper Midwestern United States. In this study, compound extreme precipitation preceded by extreme hot day events was investigated. Results showed a strong linkage between extreme precipitation events and extreme hot days. A significant increasing trend was noticed mainly in Iowa (10.1%), northern parts of Illinois (5.04%), and Michigan (5.04%). Results also showed a higher intensity of extreme precipitation events preceded by an extremely hot day compared to the intensity …

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The Fierce Green Fire: Vol. 14 Issue 2, Wofford College Environmental Studies Program Sep 2023

The Fierce Green Fire: Vol. 14 Issue 2, Wofford College Environmental Studies Program

The Fierce Green Fire

No abstract provided.

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Chlorinated Water As A Source Of Chlorate Contamination In Farm Bulk Milk, Lorna Twomey, Ambrose Furey, Bernadette O'Brien, David Gleeson Sep 2023

Chlorinated Water As A Source Of Chlorate Contamination In Farm Bulk Milk, Lorna Twomey, Ambrose Furey, Bernadette O'Brien, David Gleeson

Physical Sciences Publications

The potential for chlorinated water to cause chlorate contamination of milk was evaluated at both laboratory and field level. It was found that for such contamination to occur, direct contact of water and milk was necessary. To minimise the opportunity for chlorinated water to cause chlorate contamination of milk, it is vital to ensure that milk handling equipment is engineered to provide for proper drainage of water and that all necessary steps are taken to prevent the adulteration of milk with water.

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On Nowhere Zero 4-Flows In Regular Matroids, Xiaofeng Wang, Taoye Zhang, Ju Zhou Sep 2023

On Nowhere Zero 4-Flows In Regular Matroids, Xiaofeng Wang, Taoye Zhang, Ju Zhou

Theory and Applications of Graphs

Walton and Welsh proved that if a co-loopless regular matroid M does not have a minor in {M(K(3,3)),M∗(K5)}, then M admits a nowhere zero 4-flow. Lai, Li and Poon proved that if M does not have a minor in {M(K5),M∗(K5)}, then M admits a nowhere zero 4-flow. We prove that if a co-loopless regular matroid M does not have a minor in {M((P10)¯3 ),M∗(K5)}, then M admits a nowhere zero 4-flow where (P10)¯3 is the graph obtained from the Petersen graph P10by contracting 3 edges of a perfect matching. As …

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Identification Of Sources In A Boundary Value Problem For Benney-Luke Type Differential Equation With Integral Conditions, Farhod Rakhmonov Sep 2023

Identification Of Sources In A Boundary Value Problem For Benney-Luke Type Differential Equation With Integral Conditions, Farhod Rakhmonov

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

In three-dimensional domain a problem of identification of recourses for Benney-Luke type partial differential equation of the even order with integral form conditions, spectral parameter and small positive parameters in mixed derivatives is considered. The solution of this partial differential equation is studied in the class of regular functions. The Fourier series method is used. Using this Fourier method, is obtained a countable system of ordinary differential equations. So, the nonlocal boundary value problem is integrated as an ordinary differential equation. When we define the arbitrary integration constants there are possible five cases with respect to the spectral parameter. By …

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Error Estimation For The Third-Order Accuracy Approximate Solution Of The Cauchy Problem By The Taylor Formula, Abdugani Abdullaev Sep 2023

Error Estimation For The Third-Order Accuracy Approximate Solution Of The Cauchy Problem By The Taylor Formula, Abdugani Abdullaev

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

A method based on the Taylor formula for the approximate solution of the Cauchy problem for the ordinary differential equation is studied. The problem of estimating the accuracy of the approximate solution generated by this method is considered, and an estimate of high accuracy is obtained for the difference of the exact and approximate solution. Here, different from the known values, an exact expression for the estimation coefficient is found.

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Evasion Differential Game Of Two Pursuers And One Evader, Toychivoy Tursunaliev Sep 2023

Evasion Differential Game Of Two Pursuers And One Evader, Toychivoy Tursunaliev

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

We study a linear evasion differential game of two pursuers and one evader. We impose geometric constraints on the control parameters of players. The control sets of pursuers are unit balls, and that of evader is the ball of radius σ,σ>1. Evasion is said to be possible if the state of the evader doesn't coincide with the state of any pursuer for all time. We construct an evasion strategy for the evader that guarantees the evasion from any initial positions of players. Also, we introduce the concept of approach times. We show that the number of approach times doesn't …

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Asymptotic Results For Empirical Processes In Informative Model Of Random Censorship From Both Sides, Abdurakhim Abdushukurov, Dilshod Mansurov Sep 2023

Asymptotic Results For Empirical Processes In Informative Model Of Random Censorship From Both Sides, Abdurakhim Abdushukurov, Dilshod Mansurov

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

In the paper, the empirical process in informative model of random censorship from both sides is investigated. For it, the limit Gaussian process with mean zero is founded. Under investigating of empirical process, the characterization properties of the considered informative model is used. The properties of the semiparametric estimator by using methods of numerical modeling are discussed.

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Efficient Power Management Optimization Based On Whale Optimization Algorithm And Enhanced Differential Evolution, Khalid Zaman, Sun Zhaoyun, Babar Shah, Altaf Hussain, Tariq Hussain, Umer Sadiq Khan, Farman Ali, Boukansous Sarra Sep 2023

Efficient Power Management Optimization Based On Whale Optimization Algorithm And Enhanced Differential Evolution, Khalid Zaman, Sun Zhaoyun, Babar Shah, Altaf Hussain, Tariq Hussain, Umer Sadiq Khan, Farman Ali, Boukansous Sarra

All Works

Daily increases in electricity prices accompany daily increases in energy consumption and use. An effective load-balancing scheduling system is necessary for the lowest cost of use and the lowest cost. Despite these devices having a significant capacity for power consumption, they must find a means to balance the load at a low price. Even if lowering the voltage is challenging, it is possible to do it at the lowest cost. Hybrid Whale Differential Evolution (HWDE) is a new optimization method that combines the well-known approaches of the Whale Optimization Algorithm (WOA) and Enhanced Differential Evolution (EDE). By balancing the required …

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A New Capacity In The Class Of ShM Functions Defined By Laplace Operator, Nurali Akramov, Khakimboy Egamberganov Sep 2023

A New Capacity In The Class Of ShM Functions Defined By Laplace Operator, Nurali Akramov, Khakimboy Egamberganov

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

In this paper, we define a new capacity Δm on the class of shm functions, which is defined by Laplace operator. We prove that Δm-capacity satisfies Choquet’s axioms of measurability. Moreover, we compare our capacity with Sadullaev-Abdullaev capacities. In particular, it implies that Δm-capacity of a set E is zero if and only if E is a m-polar set.

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Gibbs Measures Of Models With Uncountable Set Of Spin Values On Lattice Systems, Farhod Haydarov Sep 2023

Gibbs Measures Of Models With Uncountable Set Of Spin Values On Lattice Systems, Farhod Haydarov

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

In this paper, we shall discuss the construction of Gibbs measures for models with uncountable set of spin values on Cayley trees. It is known that "translation-invariant Gibbs measures" of the model with an uncountable set of spin values can be described by positive fixed points of a nonlinear integral operator of Hammerstein type. The problem of constructing a kernel with non-uniqueness of the integral operator is sufficient in Gibbs measure theory. In this paper, we construct a degenerate kernel in which the number of solutions does not exceed 3, and in turn, it only gives us a chance to …

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Final Third Cycle Best Management Practices (Bmps) New And Mahoney Work Plan, Pioneer Technical Services, Inc. Sep 2023

Final Third Cycle Best Management Practices (Bmps) New And Mahoney Work Plan, Pioneer Technical Services, Inc.

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

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Final 2023 Butte Priority Soils Operable Unit (Bpsou) Borrow Amendment Work Plan, Pioneer Technical Services, Inc. Sep 2023

Final 2023 Butte Priority Soils Operable Unit (Bpsou) Borrow Amendment Work Plan, Pioneer Technical Services, Inc.

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

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Sugar-Sweetened Beverages And Artificially Sweetened Beverages Consumption And The Risk Of Nonalcoholic Fatty Liver (Nafld) And Nonalcoholic Steatohepatitis (Nash), Tung Sung Tseng, Wei Ting Lin, Peng Sheng Ting, Chiung Kuei Huang, Po Hung Chen, Gabrielle V. Gonzalez, Hui Yi Lin Sep 2023

Sugar-Sweetened Beverages And Artificially Sweetened Beverages Consumption And The Risk Of Nonalcoholic Fatty Liver (Nafld) And Nonalcoholic Steatohepatitis (Nash), Tung Sung Tseng, Wei Ting Lin, Peng Sheng Ting, Chiung Kuei Huang, Po Hung Chen, Gabrielle V. Gonzalez, Hui Yi Lin

School of Public Health Faculty Publications

Nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH) are fast becoming the most common chronic liver disease and are often preventable with healthy dietary habits and weight management. Sugar-sweetened beverage (SSB) consumption is associated with obesity and NAFLD. However, the impact of different types of SSBs, including artificially sweetened beverages (ASBs), is not clear after controlling for total sugar intake and total caloric intake. The aim of this study was to examine the association between the consumption of different SSBs and the risk of NAFLD and NASH in US adults. The representativeness of 3739 US adults aged ≥20 years …

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Inventory Of Glaciers And Perennial Snowfields Of The Conterminous Usa, Andrew G. Fountain, Bryce Glenn, Christopher Mcneil Sep 2023

Inventory Of Glaciers And Perennial Snowfields Of The Conterminous Usa, Andrew G. Fountain, Bryce Glenn, Christopher Mcneil

Geology Faculty Publications and Presentations

This report summarizes an updated inventory of glaciers and perennial snowfields of the conterminous United States. The inventory is based on interpretation of mostly aerial imagery provided by the National Agricultural Imagery Program, US Department of Agriculture, with some satellite imagery in places where aerial imagery was not suitable. The inventory includes all perennial snow and ice features ≥ 0.01 km2. Due to aerial survey schedules and seasonal snow cover, imageries acquired over a number of years were required. The earliest date is 2013 and the latest is 2020, but more than 73 % of the outlines were …

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Development Of Single-Crystalline And 3d-Printable Porous Organic Materials, Mingshi Zhang Sep 2023

Development Of Single-Crystalline And 3d-Printable Porous Organic Materials, Mingshi Zhang

Dartmouth College Ph.D Dissertations

Porous organic materials with designable structures, large surface areas, low densities, and unique electronic and optical properties have found widespread applications in adsorption, separation, energy storage, and catalysis. However, the majority of organic porous materials are synthesized as fluffy powders, which poses two fundamental challenges for them. Firstly, they lack a single-crystal structure at the microscopic scale, making it difficult to study the specific pore size, shape, and potential substrate binding sites at the atomic level and further establish the structure-property relationship. Secondly, they lack the general processing method and macroscopic shape design, making it difficult to manufacture suitable components …

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Constraints On Near-Ridge Magmatism Using 40Ar/39Ar Geochronology Of Enriched Morb From The 8°20' N Seamount Chain, Molly K. Anderson, Michael R. Perfit, Leah E. Morgan, Daniel J. Fornari, Michael Cosca, V. Dorsey Wanless Sep 2023

Constraints On Near-Ridge Magmatism Using 40Ar/39Ar Geochronology Of Enriched Morb From The 8°20' N Seamount Chain, Molly K. Anderson, Michael R. Perfit, Leah E. Morgan, Daniel J. Fornari, Michael Cosca, V. Dorsey Wanless

Geosciences Faculty Publications and Presentations

Our understanding of the spatial-temporal-compositional relationships between off-axis magmatism and mid-ocean ridge spreading centers is limited. Determining the 40Ar/39Ar ages of mid-ocean ridge basalt (MORB) lavas erupting near mid-ocean ridges (MOR) has been a challenge due to the characteristically low K2O contents in incompatible element-depleted normal MORB (NMORB). High-precision 40Ar/39Ar geochronology is used here to determine ages of young, basaltic lavas erupted along the 8°20' N seamount chain west of the East Pacific Rise (EPR) axis that have a range of incompatible element enrichments (EMORB) suitable for 40Ar/39Ar geochronology …

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A Social Profile-Based E-Learning Model, Xola Ntlangula Sep 2023

A Social Profile-Based E-Learning Model, Xola Ntlangula

African Conference on Information Systems and Technology

Many High Education Institutions (HEIs) have migrated to blended or complete online learning to cater for less interruption with learning. As such, there is a growing demand for personalized e-learning to accommodate the diversity of students' needs. Personalization can be achieved using recommendation systems powered by artificial intelligence. Although using student data to personalize learning is not a new concept, collecting and identifying appropriate data is necessary to determine the best recommendations for students. By reviewing the existing data collection capabilities of the e-learning platforms deployed by public universities in South Africa, we were able to establish the readiness of …

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Factors Influencing The Retention Of Millennial Software Developers In South African Companies, Kim Fouche, Maureen Tanner Sep 2023

Factors Influencing The Retention Of Millennial Software Developers In South African Companies, Kim Fouche, Maureen Tanner

African Conference on Information Systems and Technology

South Africa has an Information Technology skills shortage leading to high turnover of Information Technology professionals. Not only do companies face significant costs in replacing software developers, but high mobility also affects staff morale. Millennials are known to be more loyal to their own needs and do not tend to stay at companies for long, increasing the complexities of retention. This study explores the factors that influence the retention of millennial software developers in South African companies. The qualitative study was carried out using online semi-structured interviews. The study found that work environment, lifestyle, and management style, play a key …

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