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2021

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Predictive Analysis And Synthesis, Modeling And Control Of Complex Technological Processes And Systems, Zhahongir Sherboyevich Bekqulov Dec 2021

Predictive Analysis And Synthesis, Modeling And Control Of Complex Technological Processes And Systems, Zhahongir Sherboyevich Bekqulov

Chemical Technology, Control and Management

Consider the theoretical underpinnings of practically predictive analysis and synthesis, modeling and automatic control of complex chemical technological processes and systems, and the evolution of advanced (or advanced) APC (Advanced Process Control) control of technological processes and industries. The current state of industrial automation systems and the characteristics of their deployment are highlighted. The features of each stage of the analysis and synthesis of APC - advanced process control for complex dynamic objects are disclosed. The real situation and features of the implementation of industrial automation systems of industrial enterprises are reflected.

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New Transformer Changer Static Characteristics Measuring Angle Silences Difference, Sultan Faizullayevich Аmirov, Nurulla Raxmatullayevich Yuldashev Dec 2021

New Transformer Changer Static Characteristics Measuring Angle Silences Difference, Sultan Faizullayevich Аmirov, Nurulla Raxmatullayevich Yuldashev

Chemical Technology, Control and Management

Presented the specific features of the new transformer converter, which measures the difference in angular displacement, and examines the nonlinearity levels of static characteristics, sensitivity and static characteristics. Studies have shown that in a new measuring device, where one of the two moving parts consists of a magnetic conductor made in the form of an Archimedean spiral made of ferromagnetic material, the balance of the magnetic bridge changes not only depending on the angle of rotation of it’s shoulder resistances. the current is disturbed by the change in the magnitude of the combined air gap depending on the angle of …

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Quality Control Of Combustion Of Gaseous Fuel In Furnaces, Azamat Toirovich Rajabov Dec 2021

Quality Control Of Combustion Of Gaseous Fuel In Furnaces, Azamat Toirovich Rajabov

Chemical Technology, Control and Management

The issues of research and development of systems for monitoring the availability and quality of the process of fuel combustion in industrial furnaces are interpreted. The perspective of using new elements in control systems - communication sensors for the presence and quality in gas-burning installations and furnaces are shown. A method has been developed to control the optimal aeration coefficient based on the extreme of the total integral amplitude-frequency characteristic of the flame conductivity pulsations, which makes it possible to control the quality characteristics of gas-burner devices and control the ratio of the components of the combustible mixture with high …

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Algorithm For Calculating The Parameters Of A Multi-Position Electromagnetic Linear Mechatronic Module, Nazarov Khayriddin Nuritdinovich, Matyokubov Nurbek Rustamovich, Temurbek Omonboyevich Rakhimov Dec 2021

Algorithm For Calculating The Parameters Of A Multi-Position Electromagnetic Linear Mechatronic Module, Nazarov Khayriddin Nuritdinovich, Matyokubov Nurbek Rustamovich, Temurbek Omonboyevich Rakhimov

Chemical Technology, Control and Management

Currently, in the world in the field of science, engineering and technology, including in mechatronics and robotics, the creation of multi-coordinate mechatronic systems that perform power and control functions is becoming of paramount importance, this is due to a number of important positive qualities of the systems, such as simplicity and compactness of the design, the possibility of obtaining significant efforts, high accuracy and stability of the establishment of fixed positions, ease of control and high reliability. This article presents the calculation of the parameters of multi-position mechatronic modules based on linear execution elements. In the construction of this model, …

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Regular Algorithms For Adaptive Identification Of Linear Non-Stationary Systems, H.Z. Igamberdiyev, H.I. Sotvoldiev, U.F Mamirov Dec 2021

Regular Algorithms For Adaptive Identification Of Linear Non-Stationary Systems, H.Z. Igamberdiyev, H.I. Sotvoldiev, U.F Mamirov

Chemical Technology, Control and Management

The article deals with the formation of regular algorithms for adaptive parametric spline identification of linear non-stationary systems. Analyzed the issues of constructing adaptive identification of continuous linear non-stationary systems with monotonic and sign-constant parameters. In this case, in a non-stationary system, the entire observation interval is in some way divided into sub-intervals. Identification is carried out at each of the parameter constancy intervals, while the parameter matrix is re-evaluated for the next interval. The input data of the system are determined with an error depending on the error of approximating the state of the system by splines and approximating …

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A Study Of The Awareness And Utilization Of Digitized Resources In Selected University Libraries Of Karnataka, K N Lakshmipathi, Research Scholar, Centre For Research And Evaluation, Senhilkumar R., Research Supervisor, Bharathiar University & Librarian (Sg) & Head (Research), Dept. Of Lis, Kongunadu Arts And Science College (Autonomous) Dec 2021

A Study Of The Awareness And Utilization Of Digitized Resources In Selected University Libraries Of Karnataka, K N Lakshmipathi, Research Scholar, Centre For Research And Evaluation, Senhilkumar R., Research Supervisor, Bharathiar University & Librarian (Sg) & Head (Research), Dept. Of Lis, Kongunadu Arts And Science College (Autonomous)

Library Philosophy and Practice (e-journal)

Due to information explosion and overload of information, libraries are unable to procure or subscribe to the enormous published information. Libraries are finding it difficult to supply the most deemed reading materials such as reference, rare, career advancement, scholarly publications, government publications, and research related reading materials. Thus, to overcome this existing problem, now the libraries, especially university libraries are starting to digitize the value added reading materials and have made them available through a digital library, gateways, portals, archives, repositories, and consortium electronic platforms. In this context, the present study evaluates the awareness and utilization of digitized resources by …

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Online Databases Backbone For Teaching And Research: Case Study Of Rajarambapu Institute Of Technology, Affiliated To Shivaji University, Kolhapur, Maharashtra (India), Vishwas L. Hase, Mahesh N. Gaikwad, Yuvraj G. Jadhav Assistant Professor , Dept. Of Library And Information Science Dec 2021

Online Databases Backbone For Teaching And Research: Case Study Of Rajarambapu Institute Of Technology, Affiliated To Shivaji University, Kolhapur, Maharashtra (India), Vishwas L. Hase, Mahesh N. Gaikwad, Yuvraj G. Jadhav Assistant Professor , Dept. Of Library And Information Science

Library Philosophy and Practice (e-journal)

The library facilities and services have changed during the pandemic from both the librarians’ and library users’ points of view. Research and academic communication disseminated via emerging online databases and resulted in creating awareness and utilization of electronic resources remotely. The present study investigates the availability, awareness, and use of online databases subscribed from direct publishers and also accessed from Shivaji University, Kolhapur, India, under the INFEED project by Rajarambapu Institute of Technology (RIT) staff members and students during the lockdown period. A mixed research approach (i.e. quantitative and qualitative) has been applied by using an online questionnaire as a …

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Measurement Of Differential Branching Fractions Of Inclusive B →Xuℓ+Νℓ Decays, L. Cao, W. Sutcliffe, R. Van Tonder, F. U. Bernlochner, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, K. Belous, J. Bennett, M. Bessner, T. Bilka, J. Biswal, A. Bobrov, M. Bračko Dec 2021

Measurement Of Differential Branching Fractions Of Inclusive B →Xuℓ+Νℓ Decays, L. Cao, W. Sutcliffe, R. Van Tonder, F. U. Bernlochner, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, K. Belous, J. Bennett, M. Bessner, T. Bilka, J. Biswal, A. Bobrov, M. Bračko

Faculty and Student Publications

The first measurements of differential branching fractions of inclusive semileptonic B→Xuℓ+νℓ decays are performed using the full Belle data set of 711 fb-1 of integrated luminosity at the (4S) resonance and for ℓ=e, μ. With the availability of these measurements, new avenues for future shape-function model-independent determinations of the Cabibbo-Kobayashi-Maskawa matrix element |Vub| can be pursued to gain new insights in the existing tension with respect to exclusive determinations. The differential branching fractions are reported as a function of the lepton energy, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting …

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Regional Topological Aberrances Of White Matter- And Gray Matter-Based Functional Networks For Attention Processing May Foster Traumatic Brain Injury-Related Attention Deficits In Adults, Ziyan Wu, Meng Cao, Xin Di, Kai Wu, Yu Gao, Xiaobo Li Dec 2021

Regional Topological Aberrances Of White Matter- And Gray Matter-Based Functional Networks For Attention Processing May Foster Traumatic Brain Injury-Related Attention Deficits In Adults, Ziyan Wu, Meng Cao, Xin Di, Kai Wu, Yu Gao, Xiaobo Li

Publications and Research

Traumatic brain injury (TBI) is highly prevalent in adults. TBI-related functional brain alterations have been linked with common post-TBI neurobehavioral sequelae, with unknown neural substrates. This study examined the systems-level functional brain alterations in white matter (WM) and gray matter (GM) for visual sustained-attention processing, and their interactions and contributions to post-TBI attention deficits. Task-based functional MRI data were collected from 42 adults with TBI and 43 group-matched normal controls (NCs), and analyzed using the graph theoretic technique. Global and nodal topological properties were calculated and compared between the two groups. Correlation analyses were conducted between the neuroimaging measures that …

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Dielectric Relaxation Studies Of Hydrogen Bonded Complexes Of Benzamide And Acetamide With Halogenated Phenols Using X-Band Microwave Frequency, Basha A. Aathif, Khan F. Liakath Ali Dec 2021

Dielectric Relaxation Studies Of Hydrogen Bonded Complexes Of Benzamide And Acetamide With Halogenated Phenols Using X-Band Microwave Frequency, Basha A. Aathif, Khan F. Liakath Ali

ASEAN Journal on Science and Technology for Development

At 308 K, using a 9.37 GHz dielectric relaxation setup, dielectric studies of hydrogen bonded complexes of benzamide and acetamide with 4-fluorophenol, 4-bromophenol, 4-chlorophenol, and 4-iodophenol in benzene were performed. Various dielectric parameters (such as ?', ?'', ?0, ??) were tested. The steric interactions of the proton donor determined the group rotation relaxation time t(2), whereas the significance of the single frequency method of Higasi et al. for multiple relaxation time t(1) was determined by the hydrogen bonding power of the phenolic hydrogen. The presence of a 1:1 complex system between the prepared samples, as well as a charge transfer …

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Study Of Microstructure And Mechanical Properties Of As-Built And Heat-Treated Additive Manufactured Inconel 718 Alloy, Maurya Ajay Kumar, Kumar Amit Dec 2021

Study Of Microstructure And Mechanical Properties Of As-Built And Heat-Treated Additive Manufactured Inconel 718 Alloy, Maurya Ajay Kumar, Kumar Amit

ASEAN Journal on Science and Technology for Development

Additive manufacturing technology is becoming popular in the industry because it allows the manufacturer to fabricate cost-effective, strong, lightweight, and complex-shaped parts directly from 3D design data as compared with the conventional manufacturing method. Inconel 718 alloy is the most demanding material in aviation as well as in the automobile industry, in terms of manufacturing high-performance parts. In this study, Inconel 718 samples were built using the direct metal laser sintering process, and standard heat treatment was performed on the samples to improve their microstructure and mechanical properties. The as-built samples exhibited good grain structure with fine laves phases, but …

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High Expression Of Glycolytic Genes In Clinical Glioblastoma Patients Correlates With Lower Survival, Kimberly M. Stanke, Carrick Wilson, Srivatsan Kidambi Dec 2021

High Expression Of Glycolytic Genes In Clinical Glioblastoma Patients Correlates With Lower Survival, Kimberly M. Stanke, Carrick Wilson, Srivatsan Kidambi

Department of Chemical and Biomolecular Engineering: Faculty Publications

Glioblastoma (GBM), the most aggressive brain tumor, is associated with a median survival at diagnosis of 16–20 months and limited treatment options. The key hallmark of GBM is altered tumor metabolism and marked increase in the rate of glycolysis. Aerobic glycolysis along with elevated glucose consumption and lactate production supports rapid cell proliferation and GBM growth. In this study, we examined the gene expression profile of metabolic targets in GBM samples from patients with lower grade glioma (LGG) and GBM. We found that gene expression of glycolytic enzymes is up-regulated in GBM samples and significantly associated with an elevated risk …

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Spatial Variation In Epibiont Communities On The Shells Of Patella Vulgata Along An Estuarine Gradient, Edward Wilson Dec 2021

Spatial Variation In Epibiont Communities On The Shells Of Patella Vulgata Along An Estuarine Gradient, Edward Wilson

The Plymouth Student Scientist

In space limited intertidal habitats, non-specific substratum generalists can be observed to increase their survival and settlement opportunities by growing upon other living organisms. To date, few studies have assessed the influence of multiple environmental factors in determining patterns of epibiont diversity and community structure upon gastropod shells, across spatial scales. This study investigated the significance of surface salinity range, wave exposure and shell metrics in determining the composition and diversity of epibionts found upon shells of Patella vulgata (Common Limpet), throughout the Plymouth Sound and lower reaches of the Tamar Estuary, United Kingdom (UK). A total of 292 shells …

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Predicting Emergency Repairs Using Classification Method, Jacqueline Tan, Qing Zhang, Sia Wang Ying, Yutong Qin Dec 2021

Predicting Emergency Repairs Using Classification Method, Jacqueline Tan, Qing Zhang, Sia Wang Ying, Yutong Qin

The Plymouth Student Scientist

This paper discusses how each explanatory variable affects the possibility of having an emergency repair to people’s home with the help of machine learning. Here, the outcome variable is binary. The aim of this is to determine whether increasing the frequency of routine repairs would decrease the frequency of emergency repairs, and the predicted probability of having an emergency repair based on the variable statuses for each property. Data exploratory is first carried out to understand and simplify the dataset obtained from a Housing Association. Statistical models such as logistic regression, decision tree, random forest, linear discriminant analysis and k-nearest …

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Constrained Portfolio Optimisation, Mohammad Alam Tahir Dec 2021

Constrained Portfolio Optimisation, Mohammad Alam Tahir

The Plymouth Student Scientist

Portfolio optimisation is an important problem in finance; it allows investors to manage their investments effectively. This paper considers finding the efficient frontier associated with the mean-variance portfolio optimisation (unconstrained) problem. We then extend the mean-variance model to include cardinality constraints (resulting in an NPHard problem) that limits the number of assets in a portfolio. We discuss different types of algorithms that one can use for finding the optimal portfolios, implementing a meta-heuristic genetic algorithm technique to solve the unconstrained and cardinality constrained problems. Finally, we improve our solutions by altering the crossover and mutation probabilities in the genetic algorithm …

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The Effect Of Onshore Wind On Wave Overtopping Of A Vertical Sea Wall, Sarah Durbridge Dec 2021

The Effect Of Onshore Wind On Wave Overtopping Of A Vertical Sea Wall, Sarah Durbridge

The Plymouth Student Scientist

Strong winds can produce overtopping rates that are considerably higher than predicted by the EurOtop formulae, which do not make provision for wind. However, no detailed industry guidance exists about the quantification of those wind effects. Physical modelling tests (scale 1:21) investigated how the mean rate of overtopping changed with wave frequency under the influence of various wind speeds. The nature and quantity of overtopping was found to be strongly related to the frequency of the incident wave. The wind had a significant effect on the mean overtopping rate, with the most pronounced effect occurring when the overtopping was at …

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An Isotropic Neo-Hookean Finite Element Model Of Healthy Elastic Arterial Walls Within Commercial Software, Reece Ambrose Dec 2021

An Isotropic Neo-Hookean Finite Element Model Of Healthy Elastic Arterial Walls Within Commercial Software, Reece Ambrose

The Plymouth Student Scientist

A non-linear isotropic finite element model of an elastic arterial wall is developed within the ANSYS commercial software package. While progressively increasing complexity of the model, it is validated with analytical theory. Geometric nonlinearity is investigated and an iterative convergence method for the calculation of a solution-dependent axial force, which increases with artery deformation, is presented. Neo-Hookean hyperelastic material models are fitted to existing uniaxial, biaxial, and shear experimental data from literature for both rubber and polyurethane elastomer to introduce material nonlinearity into the arterial wall model. A mesh independence study was performed to determine a suitable mesh and the …

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Scale Model Behaviour And Float Geometry Influence On An Oscillating Water Column System, Daniel Cresswell Dec 2021

Scale Model Behaviour And Float Geometry Influence On An Oscillating Water Column System, Daniel Cresswell

The Plymouth Student Scientist

A numerical model based on a 1:60 scale Lazy-S Mooring Line has been developed using the dynamic analysis software OrcaFlex, to determine the software’s capabilities when analysing discretized scale models, and to quantify the effect that varying float surface geometry has on mooring line system damping. Static analysis was performed, followed by dynamic analysis, based on experimental data from physical testing in the University of Plymouth 35m Sediment Flume tank, against two distinct float shapes with equivalent hydrostatic properties but aspect ratio variance perpendicular to fluid flow. The impact of scale modelling on static line forces, effective tension and driving …

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Variability In Epifaunal Assemblages Between Sargassum Muticum And Zostera Marina: A Functional Group Approach, Jenny Hickman Dec 2021

Variability In Epifaunal Assemblages Between Sargassum Muticum And Zostera Marina: A Functional Group Approach, Jenny Hickman

The Plymouth Student Scientist

Marine macrophytes are globally important to coastal ecosystems, providing refugia, nutrients and important ecological processes. The structure and composition of macrophytes have a bottom-up effect on the epifauna they support. Due to their wide-reaching effects, invasive algae are considered one of the greatest threats facing marine ecosystems. Sargassum muticum is a Japanese algae increasing its non-native range in coastal habitats globally. A highly dispersive algae, able to colonise soft substratum, it is considered a threat to seagrass beds across the North East Atlantic. In Salcombe Estuary, Devon, beds of Zostera marina have seen increasing levels of invasion by S. muticum. …

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A Comparison Of The Risk Of Pancreatic Adenocarcinoma Development Between Individuals With Different Abo Blood Group Phenotypes: A Meta-Analysis, Danielle Martin Dec 2021

A Comparison Of The Risk Of Pancreatic Adenocarcinoma Development Between Individuals With Different Abo Blood Group Phenotypes: A Meta-Analysis, Danielle Martin

The Plymouth Student Scientist

A comparison of the risk of pancreatic adenocarcinoma development between individuals with different ABO blood group phenotypes: A meta-analysis

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What Effect Do Government Policies Have On The Transmission Of Covid-19?, Emily Prestige Dec 2021

What Effect Do Government Policies Have On The Transmission Of Covid-19?, Emily Prestige

The Plymouth Student Scientist

This investigation aimed to determine the effect of government policies on the transmission of COVID-19 during the period 30/01/2020 – 03/01/2021. This investigation used qualitative data from policy legislation and journals and quantitative data from official government pandemic figures. It also used central factors of successful government approaches to assess the efficacy of the UK Government strategy. The measure used to monitor transmission rates is the instantaneous reproduction number Rt. I have used summary statistics, data visualisation, and time series representations to conduct exploratory data analyses. I also investigated the change in testing capacity and positivity rate over time to …

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Review—Concentration Measurements In Molten Chloride Salts Using Electrochemical Methods, Tyler Williams, Rankin Shum, Devin Rappleye Dec 2021

Review—Concentration Measurements In Molten Chloride Salts Using Electrochemical Methods, Tyler Williams, Rankin Shum, Devin Rappleye

Faculty Publications

The electrochemical measurement of concentration in molten chloride salts is a valuable tool for the control of existing and potential industrial processes, recycling of precious materials and energy production. The electrochemical techniques commonly used to measure concentration and each techniques’ associated theory are discussed. Practices which improve measurement accuracy and precision are set forth. Exceptionally accurate and precise measurements published in the literature are evaluated based on their performance in specified concentration ranges. The strengths and weaknesses of the most accurate measurements are briefly explored. Chronopotentiometry (CP) and square wave voltammetry (SWV) are accurate and precise with low concentration measurements. …

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Increasing Awareness Of Inclusive Stem Education Through A College-Level Student Research Group, Sami Kahn, Tiffany Agyarko, Grace Lanouette, Sean Lee, Courteney Wiredu Dec 2021

Increasing Awareness Of Inclusive Stem Education Through A College-Level Student Research Group, Sami Kahn, Tiffany Agyarko, Grace Lanouette, Sean Lee, Courteney Wiredu

Journal of Science Education for Students with Disabilities

The underrepresentation of persons with disabilities in STEM reflects not only a moral failing in society’s commitment to equity but also a practical dilemma as science benefits from the contributions of people with diverse perspectives. While teacher education programs attempt to address equity at the K-12 level, societal biases and misconceptions about who is “able” in science present persistent barriers for people with disabilities throughout the STEM pipeline, in higher education, employment, and beyond. How can we ensure that students with disabilities will encounter professors, employers, coworkers, and peers who are supportive of their efforts in STEM? To address this …

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Application Of Competitive Intelligence For Insular Territories: Automatic Analysis Of Scientific And Technology Trends To Fight The Negative Effects Of Climate Change, Henri Dou, Pierre Fournie Dec 2021

Application Of Competitive Intelligence For Insular Territories: Automatic Analysis Of Scientific And Technology Trends To Fight The Negative Effects Of Climate Change, Henri Dou, Pierre Fournie

International Journal of Islands Research

Islands are fragile territories because of their geographical position. As a result, climate impacts can have serious consequences, of which some are irreversible. Therefore, it is necessary to allow insular territories to benefit from the latest scientific and technological advances in combating climate effects. The current article shows how to deal with automatic analysis of scientific information on the one hand, but also its applications via patents. We will analyse the latest scientific results as well as their possible applications using patent analysis. We will also focus on experts, laboratories, and leading companies, that are active on the field. The …

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Human-Nature Relationships In Raja Ampat: How Tourism Development In Coastal Areas Affects Residents’ Local Wisdom And Social Wellbeing, Timoti Tirta Dec 2021

Human-Nature Relationships In Raja Ampat: How Tourism Development In Coastal Areas Affects Residents’ Local Wisdom And Social Wellbeing, Timoti Tirta

International Journal of Islands Research

This article illustrates residents’ local wisdom and social well-being regarding tourism development in a coastal area. Tourism development is believed to cause various impacts in various aspects of residents’ life, such as economic, socio-cultural and environmental. This article will explain how those impacts, added to residents’ local wisdom, result in different perceptions from them. The research which was conducted for this article used qualitative methods, involving 18 informants in semi-structured interviews in Saporkren and Sawingrai, Raja Ampat. The research sought to elaborate the relationship between impacts, residents’ perceptions and their social well-being in the context of tourism development. The findings …

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Climate Change-Induced Effects On Beach Degradation And Tourist Behaviour: A Review Of Previous Studies With Potential In An Island Tourism Context, Yen E. Lam González, Carmen Garcia, Matias M. González Hernández, Carmelo J. Leon Dec 2021

Climate Change-Induced Effects On Beach Degradation And Tourist Behaviour: A Review Of Previous Studies With Potential In An Island Tourism Context, Yen E. Lam González, Carmen Garcia, Matias M. González Hernández, Carmelo J. Leon

International Journal of Islands Research

This article conducts a qualitative meta-analysis of papers addressing the topic of climate change impacts on beach loss and degradation, and its relation to tourist behaviour (destination choice, willingness to re-visit, expenditure and willingness to pay). The main aim is to identify values that can be used in future research works in the context of island tourism. We found that the strong specialisation and fragmentation of data and methods limit the transferability potential of previous research analysing climate-induced effects on beaches and tourist behaviour. Researchers from different fields bring their own conceptual models which often address similar problems but use …

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A Proposed Methodology For Monitoring The Design And Implementation Phases Of Educational Buildings, Husham Hadhi Albeity Dec 2021

A Proposed Methodology For Monitoring The Design And Implementation Phases Of Educational Buildings, Husham Hadhi Albeity

Hadhramout University Journal of Natural & Applied Sciences

The planning process for the design and implementation of educational buildings constitutes an important input into the development process that targets educational buildings in the cities of Yemen, including Hadhramout Governorate - due to its weakness and deficit in meeting the needs of the educational process and in absorbing modern educational developments. It describes for its users specific steps to reach satisfying learning and teaching environments. Moreover, it clarifies the needs of its users far from randomness in the design and implementation processes for these facilities, especially in the third world countries, including Yemen. This study aims mainly to propose …

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Removal Of Lead (Ii) From Polluted Seawater In Mukalla Coast, Hadhramout Using Biotechnology Of Dried Biomass Of Macroalgae, Gracilaria Sp And Sargassum Sp, Abdullah Salem Bawazir, Eman Hassan Ba Othman Dec 2021

Removal Of Lead (Ii) From Polluted Seawater In Mukalla Coast, Hadhramout Using Biotechnology Of Dried Biomass Of Macroalgae, Gracilaria Sp And Sargassum Sp, Abdullah Salem Bawazir, Eman Hassan Ba Othman

Hadhramout University Journal of Natural & Applied Sciences

This study aimed to remove lead ions (Pb²+) from seawater mixed with wastewater that discharged to Mukalla coast. Water samples were collected from points near the sewage discharging sampling station. Macroalgae samples, Gracilaria sp and Sargassum sp were used for bio-sorption of Pb²+ from seawater in the study area. Besides, this study aimed to assess the removal efficiency of lead-heavy metal ions (Pb²+) from polluted seawaters in Mukalla coast by Macroalgae biomass. The effect of pH values (4.5 –7.5 ± 0.5) and different adsorbent dosages were used on the adsorption process through Winter and Summer …

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Seventh And Twelfth-Order Iterative Methods For Roots Of Nonlinear Equations, Hassan Mohamed Bawazir Dec 2021

Seventh And Twelfth-Order Iterative Methods For Roots Of Nonlinear Equations, Hassan Mohamed Bawazir

Hadhramout University Journal of Natural & Applied Sciences

This study presents two iterative methods, based on Newton’s method, to attain the numerical solutions of nonlinear equations. We prove that our methods have seven and twelve orders of convergence. The analytical investigation has been established to show that our schemes have higher efficiency indexes than some recent methods. Numerical examples are executed to investigate the performance of the proposed schemes. Moreover, the theoretical order of convergence is verified on the numerical examples.

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Comparative Study Of Different Fuzzy Models For Gas Compressibility Factor Prediction, Abdelrigeeb Ali Al-Gathe, Salem Obeid Baarimah, Abbas Mohamed Al-Khudafi Dec 2021

Comparative Study Of Different Fuzzy Models For Gas Compressibility Factor Prediction, Abdelrigeeb Ali Al-Gathe, Salem Obeid Baarimah, Abbas Mohamed Al-Khudafi

Hadhramout University Journal of Natural & Applied Sciences

Good estimation of gas compressibility factor (z-factor) of gas is an essential key in numerous gas and oil calculations. In the absence of experimental data, the iterative methods were run to estimate the z-factor. However, these methods are more complex and have a large number of factors, which require longer calculations. In addition, the accuracy of these correlations has become insufficient for the best estimations due to their limitations. The objective of this study is to test various Fuzzy Logic (FL) technique to develop a simple and robust approach. The FL has three types: Fuzzy c-means (FCM), grid partition (GP), …

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