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Full-Text Articles in Engineering

Quantization Of Fractional Constrained Systems With Wkb Approximation, Ola A. Jarabah Sep 2023

Quantization Of Fractional Constrained Systems With Wkb Approximation, Ola A. Jarabah

Applied Mathematics & Information Sciences

In this paper the constrained systems with two primary first class constraints are studied using fractional Lagrangian, after that we find the fractional Hamiltonian and the corresponding Hamilton Jacobi equation. Using separation of variables technique, we can find the action function S this function helps us to formulate the wave function which describe the behavior of our systems also from the action function S we can find the equations of motion and the corresponding momenta in fractional form. This work is illustrated using one example.

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Applications Of The Ara-Residual Power Series Technique To Physical Phenomena, Aliaa Burqan Sep 2023

Applications Of The Ara-Residual Power Series Technique To Physical Phenomena, Aliaa Burqan

Applied Mathematics & Information Sciences

In this paper, a new analytical method called the ARA-Residual power series method (ARA- RPSM) is implemented to solve some fractional physical equations. The methodology of the proposed method based on applying the ARA-transform to the given fractional differential equations, followed by the creation of approximate series solutions using Taylor’s expansion. Then the series solution is transformed using the inverse of the ARA-transform to get the solution in the original space. Accuracy, effectiveness, and validity of the suggested method are demonstrated through the discussion of three attractive applications. The solution obtained using ARA-RPSM demonstrates good agreement when compared to the …

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Generalization Of Renyi’S Entropy And Its Application In Source Coding, Ashiq Hussain Bhat, Niyamat Ali Siddiqui, Ismail A Mageed, Shawkat Alkhazaleh, Vidyanand Rabi Das, M. A. K Baig Sep 2023

Generalization Of Renyi’S Entropy And Its Application In Source Coding, Ashiq Hussain Bhat, Niyamat Ali Siddiqui, Ismail A Mageed, Shawkat Alkhazaleh, Vidyanand Rabi Das, M. A. K Baig

Applied Mathematics & Information Sciences

In this paper, we introduce a new generalization of Renyis entropy β(P) and the most important feature of this generalized entropy Rαβ (P) is that it derives most important entropies that are well known and influence information theory and applied mathematics. Some significant properties of Rαβ (P) has been undertaken in this article. In addition, we introduce a new generalized exponentiated mean codeword length Lβα (P) in this article then determine how Rβα (P) and Lβα (P) are related in terms of source coding theorem.

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Performance Evaluation Of Reclaimed Asphalt Pavement Rejuvenated With Waste Engine Oil And Vacuum Residue In The Presence Of Water, Heja Gh. M. Hasan, Ayman A. Abdulmawjoud Sep 2023

Performance Evaluation Of Reclaimed Asphalt Pavement Rejuvenated With Waste Engine Oil And Vacuum Residue In The Presence Of Water, Heja Gh. M. Hasan, Ayman A. Abdulmawjoud

Polytechnic Journal

The service life of a road pavement reduces as it ages and loses quality due to exposure to various traffic loads and environmental conditions. This study investigates the possibility of reusing aged asphalt in pavement by mixing Waste Engine Oil (WEO) and Vacuum Residue (VR) to create a hybrid rejuvenator. Four types of binders, namely, virgin asphalt, aged asphalt, blended aged and virgin asphalt, and rejuvenated hybrid (WEO-VR) with aged and virgin asphalt, were evaluated using rheological and water immersion tests. The results show that WEO-VR greatly enhanced the properties of old asphalt in the presence of water based on …

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Nonlinear Analysis Of Pile Raft Foundations Under Eccentric Loads, Khalid Qasim Hussein, Dr. Rafi’ M. Sulaiman Al-Ne’Aimi Sep 2023

Nonlinear Analysis Of Pile Raft Foundations Under Eccentric Loads, Khalid Qasim Hussein, Dr. Rafi’ M. Sulaiman Al-Ne’Aimi

Polytechnic Journal

This paper discusses a series of 3D nonlinear analyses of the pile group foundation of a 34-floor multi-story building subjected to vertical load and large moments using PLAXIS 3D v20 software. The soil profile consists of seven strata of various properties, with groundwater encountered at 19.6 m below the ground surface. The soil is modeled as hardening soil material in drained conditions. The piles in the pile group foundation are modeled as embedded pile elements. Several parameters were investigated through a rigorous parametric study, such as the pile spacing-diameter ratio (s/dpile), the number of piles, and the pile slenderness ratio …

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Effects Variability Number Of Load Repetitions On The Optimum Thickness Of Asphalt Layer With Respect To Fatigue And Rutting Behaviour On The Sand Bed Soil Area, Samir Hasan Raza, Nazeer Muhammed Ali Abdulah Sep 2023

Effects Variability Number Of Load Repetitions On The Optimum Thickness Of Asphalt Layer With Respect To Fatigue And Rutting Behaviour On The Sand Bed Soil Area, Samir Hasan Raza, Nazeer Muhammed Ali Abdulah

Polytechnic Journal

This study investigates the effect of the variability of a number of load repetitions on the asphalt layer thickness, and also the elastic modulus of pavement materials on the behaviour of flexible pavement structural on the sand bed soil with respect to fatigue failure and rutting failure using the mechanistic design approach. The framework is evaluated for a six-layered flexible pavement system. The major focus of this study is the influence of variability associated with the thickness and resilient moduli of an asphalt layer on fatigue and rutting failures is discussed. The methodology is based on the damage analysis concept …

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Indoors Smartphone Positioning Enhancement Using Wi-Fi And Magnetometer, Runahi F. Qadir, Halgurd S. Maghdid, Azhin T. Sabir Sep 2023

Indoors Smartphone Positioning Enhancement Using Wi-Fi And Magnetometer, Runahi F. Qadir, Halgurd S. Maghdid, Azhin T. Sabir

Polytechnic Journal

Recent embedded technologies on today’s smartphone make the smartphones more comfortable to run a large number of applications which are used for people’s daily activities. Among all these applications, the location-based services (LBS) are frequently used. The LBS applications utilized location information via Smartphones technologies. For example, when outdoors, Global Navigation System (GPS) or generally Global navigation satellite system (GNSS) signals are used to retrieve the location information within enough positioning accuracy. However, when smartphone holders are entering to the urbane area or indoors, the performance of GPS service will be degraded or sometime cannot retrieve location information due to …

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Modeling The Moisture Content And Drying Rate Of Zucchini (Cucurbita Pepo L.) In A Solar Hybrid Dryer Using Ann And Anfis Methods, Halil Nusret Bulus, Aytac Moralar, Soner Celen Sep 2023

Modeling The Moisture Content And Drying Rate Of Zucchini (Cucurbita Pepo L.) In A Solar Hybrid Dryer Using Ann And Anfis Methods, Halil Nusret Bulus, Aytac Moralar, Soner Celen

The Philippine Agricultural Scientist

Estimating product drying kinetics is critical to obtain the best drying process without compromising product quality and necessitates the development of numerical drying models. This research aims to compare the prediction models developed using artificial neural network (ANN) and adaptive network-based fuzzy inference system (ANFIS), two popular machine learning approaches in the recent years. Zucchini slices were chosen as samples and dried in a solar-assisted microwave belt dryer at 0.245 m/min belt speed and microwave powers of 0.7, 1, and 1.4 kW. On the data set obtained by computing the moisture content and drying rate values, prediction models were developed …

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Evaluation Of Slope Stabilization By Vegetation Reinforcement: Modelling Aspects, Shimal Abdulrahman Ahmed, Mohammed S. Hussain Sep 2023

Evaluation Of Slope Stabilization By Vegetation Reinforcement: Modelling Aspects, Shimal Abdulrahman Ahmed, Mohammed S. Hussain

Polytechnic Journal

The slope stability is one of the main concerns in geotechnical engineering. The focus of this study is the numerical assessment of the reinforcement using planting (vegetation) as an environmentally- friendly technique to increase the safety factor of slopes against failure. For this purpose, the physical interaction of the vegetation root with the soil structure, known as apparent root cohesion, is introduced in the Mohr-Coulomb failure model. Therefore, and using parametric study, the effects of root cohesion (Cr) and root depth (Zr) corresponding to different types of plants/trees on safety of different slopes are analyzed using both Numerical and Limit …

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Impact Of Crowded Sky On Gnss Positioning, Shamal Fatah Ahmed Sep 2023

Impact Of Crowded Sky On Gnss Positioning, Shamal Fatah Ahmed

Polytechnic Journal

Presently, there is a huge number of Global Navigation Satellite System (GNSS) satellites in orbit, and it is possible for users to have a clear view with a high number of satellites at a single epoch. This large number of satellites results in a significant improvement in satellite geometry, visibility, Dilution of Precision (DOP), and simultaneously, reduction of occupation time and sufficient time to fix the integer ambiguity. The static method is the most accurate method to establish geodetic networks using satellites, but the length of time required for the survey and the post-processing of the data may restrict its …

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Land Use Land Cover Changes Detection Of Erbil City Using Gis And Remote Sensing, Mohammed Ghadban Mohammed Sep 2023

Land Use Land Cover Changes Detection Of Erbil City Using Gis And Remote Sensing, Mohammed Ghadban Mohammed

Polytechnic Journal

Erbil City, the capital of the Kurdistan region in Iraq, witnessed significant land use land cover changes over the last two decades. These Land Cover Land Use (LULC) changes were attributed to many main social, political, climactic, and economic variables, especially after 2003 in Iraq. The use of geographic information systems and remote sensing became active tools that use public satellite images to detect LULC changes in cities. Two images of the study area of Erbil City for the years 2003 and 2020 respectively were used to analyze and get the nature and the magnitude of the LULC changes. Six …

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Scour Mitigation At Bridge Abutments Using Spur Dikes, Dina Hamdy Mustafa Mustafa Al Sirtasy, Hossam Abd El-Aziz Ahmed Abd El-Gawad, Mohamed T. Shamaa Aug 2023

Scour Mitigation At Bridge Abutments Using Spur Dikes, Dina Hamdy Mustafa Mustafa Al Sirtasy, Hossam Abd El-Aziz Ahmed Abd El-Gawad, Mohamed T. Shamaa

Mansoura Engineering Journal

One of the main reasons for bridge failure is local scour at the bridge abutments. Laboratory experiments, under clear water scour condition, were carried out to investigate scour reduction around the vertical bridge abutment by adding one upstream spur dike. Sand with a median and standard deviation of diameter equal to 0.80 mm and 2.173 mm respectively, formed the bed material. Three different stages of spur dikes with varying sets as: 1) distances from the abutment (6 sets), 2) orientation angles (4 sets), and 3) lengths (3 sets), were considered. Effects of all spur dikes are studied with respect to …

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Early Exposure/Long-Term Gains: Encouraging Underrepresented Middle School Students To Pursue Stem Careers, Trinetia Respress, Owen Johnson, Londee Boyd, Twianie Roberts Aug 2023

Early Exposure/Long-Term Gains: Encouraging Underrepresented Middle School Students To Pursue Stem Careers, Trinetia Respress, Owen Johnson, Londee Boyd, Twianie Roberts

The Journal of the Research Association of Minority Professors

Preparing middle school students in STEM for their transition to high school and ultimately for post-secondary endeavors requires early exposure to STEM subjects. This early exposure not only builds a foundation for the ever-changing skills that are needed for the workforce, but also boosts student achievement and test scores (STEM Education Works, 2021). The MUREP project focuses on increasing the number of underrepresented minority students interested in STEM fields. The purpose of this study is to examine underrepresented minority middle school students’ attitudes toward STEM and their expressed interest in STEM post-secondary subjects and careers after participation in the MUREP …

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Obtaining Sweet Molasses By The Method Of Hydromechanical And Enzymatic Processing Of Grain, Sadritdin Maxamatdinovich Turabdjanov, Kamoliddin Ahmadjonovich Mahmudov, Bexzod Alisherovich Kasimov, Kasun Dissanayake Kumara Aug 2023

Obtaining Sweet Molasses By The Method Of Hydromechanical And Enzymatic Processing Of Grain, Sadritdin Maxamatdinovich Turabdjanov, Kamoliddin Ahmadjonovich Mahmudov, Bexzod Alisherovich Kasimov, Kasun Dissanayake Kumara

Chemical Technology, Control and Management

Methods of hydrolysis of grains to starch under the influence of hydrodynamic and enzymatic processes are logically based. Polysaccharides derived from starchy grains are known and popular in the food industry for their thickening and stabilizing properties. To date, studies that allow for a deeper understanding of the mechanism of interaction of polysaccharide-containing products with their main components, the effect on the set of rheological, organoleptic, physico-chemical properties of food products that determine their functions are relevant.

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Electromagnetic Current Transducer For Control Of Reactive Power Consumption Of An Asynchronous Motor From A Single-Phase Supply Of Renewable Energy Source, Llhomjon Xakimovich Siddikov, Saidikrom Saidmurodovich A'Zamov, Dilyorbek Doniyorbek O'G'Li Karimjonov Aug 2023

Electromagnetic Current Transducer For Control Of Reactive Power Consumption Of An Asynchronous Motor From A Single-Phase Supply Of Renewable Energy Source, Llhomjon Xakimovich Siddikov, Saidikrom Saidmurodovich A'Zamov, Dilyorbek Doniyorbek O'G'Li Karimjonov

Chemical Technology, Control and Management

In the world, the demand for electricity and its quality is increasing, in order to further increase the share of renewable energy sources, the reactive power that generates the magnetic field and current in asynchronous motors, which consumes more than 60% of the electricity generated from them and provided by them The research of electromagnetic current transformers, which allows controlling the consumption, evaluating the asymmetry and nonsinusoidal indicators of reactive power and energy, remotely sensing and measuring these quantities with appropriate devices, and converting them into a standard signal, is considered an urgent issue . The research results of the …

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Application Of Evolutionary Algorithms For Optimization Of Operation Modes Of Regional Electric Power Systems, Isamiddin Khakimovich Siddikov, Oksana Vitalevna Porubay Aug 2023

Application Of Evolutionary Algorithms For Optimization Of Operation Modes Of Regional Electric Power Systems, Isamiddin Khakimovich Siddikov, Oksana Vitalevna Porubay

Chemical Technology, Control and Management

The paper presents the possibilities of using evolutionary algorithms to solve the problem of optimizing the operation modes of electric power facilities in the presence of constraints in the form of inequalities and equalities. The limits of constraints have a variable character, depending on the generated and consumed energy. Existing methods used for the optimization of modes are based on general principles and approaches to optimization, which usually adapt to the specifics of the problem. In electric power facilities, optimization problems have some peculiarities, among which is the presence of multiple constraints applied to both independent and dependent variables. Many …

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Computer Training Systems For Training Engineering Personnel For Control Industrial Enterprises, Yusuf Shodiyevich Avazov, Kamola Rustamovna Abdullaeva Aug 2023

Computer Training Systems For Training Engineering Personnel For Control Industrial Enterprises, Yusuf Shodiyevich Avazov, Kamola Rustamovna Abdullaeva

Chemical Technology, Control and Management

A principle has been proposed for constructing computer simulators for improving the qualifications of process control operators at industrial enterprises and for training students of higher educational institutions. The capabilities of a computer simulator that can be used as a digital assistant are revealed. Their architecture for building digital simulators is proposed. From the architecture it is clear that the computer simulator consists of two systems. The training process management system and the server of the computerized simulator are combined into a digital simulator. Simulators in this category provide student operators with the opportunity to develop skills in self-control of …

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Use Of Neural Networks In Intelligent Measurement Tools, N.R Yusupbekov, Y.Sh. Avazov, Umidjon Ruziev Phd Aug 2023

Use Of Neural Networks In Intelligent Measurement Tools, N.R Yusupbekov, Y.Sh. Avazov, Umidjon Ruziev Phd

Chemical Technology, Control and Management

The paper presents algorithms for processing the measurement signal with the possibilities of adaptation, learning and decision making. A comparative analysis of the methods of intellectual processing of measurement data is carried out. A model of a measuring instrument for determining the structure of a neural network has been developed. The problem of error reduction due to measurement noise filtering with the use of neural networks is considered. The structure of the neural network has been developed for intelligent processing of the measurement signal and ensuring the implementation of the functions of reconfiguration, calibration, self-diagnosis and self-control. A neural network …

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Methods For Control Of The Technical And Operational Parameters Of Vehicles, Erkin Uljaev, Utkirjon Murodillaevich Ubaydullaev Aug 2023

Methods For Control Of The Technical And Operational Parameters Of Vehicles, Erkin Uljaev, Utkirjon Murodillaevich Ubaydullaev

Chemical Technology, Control and Management

The necessity of automating the control and evaluation of the technical and operational indicators of motor vehicles (ATS) is substantiated. A classification of the main technical and operational indicators of vehicles has been carried out. Motor vehicles can be classified according to dimensions, weight, carrying capacity, cross-country ability, speed, maneuverability and other indicators. A brief review and analysis of well-known technical means of foreign firms, designed to automate the control and evaluation of the technical and operational indicators of vehicles and agricultural machinery, has been carried out. It is noted that more than 90% of the considered devices and means …

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Algorithms For Synthesis Of Adaptive Control Systems Based On The Neural Network Approach, Jasur Sevinov, Oxunjon Boborayimov, Sh.M. Abdishukurov Aug 2023

Algorithms For Synthesis Of Adaptive Control Systems Based On The Neural Network Approach, Jasur Sevinov, Oxunjon Boborayimov, Sh.M. Abdishukurov

Chemical Technology, Control and Management

Here are algorithms for the synthesis of adaptive control systems based on the neural network approach presented. The issues of choice of architectures of neural networks that produce parametric identification of the object regulation. Adaptative neural networks that reproduce the optimal parameters of implemented controllers, methods of forming training samples for their training are considered. The other question of using the theory of artificial neural networks for approximating the functional of the controller's tuning parameters are determined. Structures of synthesized neural networks of parametric identification of objects with self-alignment in an open loop ACS are proposed. Algorithms made it possible …

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The Morphology Analysis Of Soil In Remote Sensing Image Processing, Mirzayan Mirzaaxmedovich Kamilov, Mirzaakbar Xakkulmirzayevich Hudayberdiev, Bobomurod Mamitjonovich Tojiboev Aug 2023

The Morphology Analysis Of Soil In Remote Sensing Image Processing, Mirzayan Mirzaaxmedovich Kamilov, Mirzaakbar Xakkulmirzayevich Hudayberdiev, Bobomurod Mamitjonovich Tojiboev

Chemical Technology, Control and Management

This article analyzed various techniques used in satellite image processing to analyze soil morphology. Analysis of soil morphology using satellite imagery plays a crucial role in soil science research, Land Management, and environmental monitoring. It provides an economical and efficient means of studying large-scale soil variability, providing information on land sustainable use, resource management and soil conservation decisions.

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Results Of The Study Of The Pumpkin Drying Process, Jasur Esirgapovich Safarov, Shahnoza Abduvakhitovna Sultanova, Andrey Svyatoslavovich Ponasenko, Gani Toshkhujaevich Dadaev Aug 2023

Results Of The Study Of The Pumpkin Drying Process, Jasur Esirgapovich Safarov, Shahnoza Abduvakhitovna Sultanova, Andrey Svyatoslavovich Ponasenko, Gani Toshkhujaevich Dadaev

Chemical Technology, Control and Management

The article presents the results of the study of the pumpkin drying process, comparisons with different drying models are carried out. A mathematical model for numerical analysis has been developed. Pumpkin drying rates are calculated and various drying models are investigated. 5 different drying models were used to verify the accuracy of experimental data and search for the most suitable model. The experimental data obtained for the drying air temperature of 45 °C, 55 °C and 65 °C were applied to various drying models.

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Challenges In Optimization For The Performance On Sustainability Dimensions In Reverse Logistics Social Responsibility, Sumarsono Sudarto, Katsuhiko Takahashi, Mochammad Dewo Aug 2023

Challenges In Optimization For The Performance On Sustainability Dimensions In Reverse Logistics Social Responsibility, Sumarsono Sudarto, Katsuhiko Takahashi, Mochammad Dewo

Makara Journal of Technology

Reverse logistics social responsibility is preferred as the most acceptable solution for addressing the challenges in stakeholders’ debate regarding social responsibility in supply chains because it involves as many actors as possible in the supply chain to perform social responsibility to achieve sustainability. This paper explores the challenges in achieving optimal policies in sustainability dimensions for collection and recycling facilities in reverse logistics. Sustainability dimensions include economic, environmental, and social aspects. The reverse logistics is modeled on System Dynamics, and a simplified statistical analysis using a contour chart is employed in numerical experiments. Results show a narrow area of optimal …

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Mathematical Model Of An Industrial Robot Built On The Basis Of Linear Motion Mechatron Modules, Matyokubov Nurbek Rustamovich, Rakhimov Temurbek Omonboyevich Aug 2023

Mathematical Model Of An Industrial Robot Built On The Basis Of Linear Motion Mechatron Modules, Matyokubov Nurbek Rustamovich, Rakhimov Temurbek Omonboyevich

Chemical Technology, Control and Management

The use of Industry 4.0 technologies in modern production serves to increase production efficiency. Robots and robotic complexes with innovative intelligent control are widely used in industrial production. However, studying their mechanical part, linear motion mechatronic modules and control system is a complex object. The variety and complexity of control methods and operating modes negatively affects the operator's working time and production productivity. In such cases, it is necessary to improve control methods and develop technologies used in industry, including robots and robotic manipulators, which allow to perform short movements with high accuracy and speed. In the article, the mathematical …

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Systematic Analysis Of Methods Of Control Of Dynamic Objects In Conditions Of Non-Measurable Disturbances, Mamirov Farkhodovich Uktam, Buronov Mamurjon Ugli Bunyod Aug 2023

Systematic Analysis Of Methods Of Control Of Dynamic Objects In Conditions Of Non-Measurable Disturbances, Mamirov Farkhodovich Uktam, Buronov Mamurjon Ugli Bunyod

Chemical Technology, Control and Management

The article presents a systematic analysis of control methods of dynamic objects under non-measurable disturbances. It is important to study all the factors affecting the control object in order to increase the efficiency of the control system. Due to the immeasurable nature of disturbances affecting control objects, it is shown that they cause negative effects and increase the complexity of control systems in this case. In the control of dynamic objects of this type, the possibilities of control by indirect measurement of disturbances or by estimation of object position and disturbances have been explored. The use cases, shortcomings and achievements …

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Development Of The Computer Model Of The Waste Water Treatment Process Using Ion-Exchange Resins In The Matlab Program, Jaloliddin Abdurazzakovich Eshbobaev, Bakhodir Tajiddinovich Khamidov, Adham Tilovovich Norkobilov, Orifjon Sharipovich Kodirov Aug 2023

Development Of The Computer Model Of The Waste Water Treatment Process Using Ion-Exchange Resins In The Matlab Program, Jaloliddin Abdurazzakovich Eshbobaev, Bakhodir Tajiddinovich Khamidov, Adham Tilovovich Norkobilov, Orifjon Sharipovich Kodirov

Chemical Technology, Control and Management

In this work, a mathematical model of industrial wastewater treatment technology was formed. First, wastewater treatment technologies were analyzed and the technology of ion-exchange resin treatment was selected. A water purification device using ion-exchange resins was made, and tested on the Kungrad soda plant and the results were obtained. According to these results, it was determined that the cleaning coefficient of the device is up to 98-99%. In this article, a mathematical model of a wastewater treatment device using ion-exchange resins was developed using the stoichiometric matrix method. After the mathematical model of the process was found, a graph of …

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Accomplishments Of Endwall Contouring On Heat Transfer In A Passage Of A Turbine Blade, Kozhikkatil Sunil Arjun, Tide Porathoor Sunny, Narayanan Biju Aug 2023

Accomplishments Of Endwall Contouring On Heat Transfer In A Passage Of A Turbine Blade, Kozhikkatil Sunil Arjun, Tide Porathoor Sunny, Narayanan Biju

Makara Journal of Technology

The study explores axisymmetric endwall contouring with emphasis on the design of novel endwalls capable of heat load reduction. Optimizations with parameterization numerically determined by the endwall of flat shape led to the endwall of the contoured shape with substantial depletion of heat transfer in the passage of the vane. Heat transfer attributes for the generated contoured endwalls were analyzed for the exit Reynolds number of 2 × 106 . Endwall three-dimensional contouring resulted in remarkable changes in secondary flow vortices, jet-to-secondary flow interaction, and film cooling effectiveness on the flat endwall. The results pointed out that the axisymmetric convergent …

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Investigating The Resistance Properties Of Concrete Containing Waste Carpet Fibers, Faezeh Nejati, Ali Mahboobi Aug 2023

Investigating The Resistance Properties Of Concrete Containing Waste Carpet Fibers, Faezeh Nejati, Ali Mahboobi

Makara Journal of Technology

This research was conducted with the aim of investigating the use of waste carpet fiber (WCF) and assessing the resistance properties of concrete. The main goal of this study was to investigate the effect of the internal processing of concrete containing WCF on increasing its resistance properties. At the same time, the secondary goals pursued in the research included determining the optimal percentages of carpet fibers in improving compressive strength, tensile strength, and bending strength. The materials used included cement, aggregates, water, WCF, and super lubricant. This research applied seven mixing designs: A, B1, B2, C1, C2, D1, and D2. …

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Permeability Prediction For Expansive Soil Based On Physical Properties Using Artificial Neural Networks, Ferry Fatnanta, Imam Suprayogi, Nicola Rabb Ranata, Soewignjo Agus Nugroho, Agus Ika Putra Aug 2023

Permeability Prediction For Expansive Soil Based On Physical Properties Using Artificial Neural Networks, Ferry Fatnanta, Imam Suprayogi, Nicola Rabb Ranata, Soewignjo Agus Nugroho, Agus Ika Putra

Makara Journal of Technology

Permeability is a soil parameter related to the construction industry to understand the processes of infiltration, runoff, and settlement. The risk of testing errors is inevitable in permeability investigations, especially in expansive soils. Trial and error in permeability testing becomes difficult due to soils with small pore sizes and large shrinkage expansion. Several studies related to soil physical properties that affect permeability have been conducted. However, the correlation results obtained still have poor accuracy. Artificial neural networks (ANN) are machine learning systems that can change their structure to solve problems that are included in the system. The use of ANNs …

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The Relaying Network In Free-Space Optical Communications Using Optical Amplifiers In Cascaded Configuration, Ucuk Darusalam, Arockia Bazil Raj, Fitri Yuli Zulkifli, Purnomo Sidi Priambodo, Eko Tjipto Rahardjo Aug 2023

The Relaying Network In Free-Space Optical Communications Using Optical Amplifiers In Cascaded Configuration, Ucuk Darusalam, Arockia Bazil Raj, Fitri Yuli Zulkifli, Purnomo Sidi Priambodo, Eko Tjipto Rahardjo

Makara Journal of Technology

Optical relaying is the best technique to implement free-space optical (FSO) communications as a terrestrial platform. However, atmospheric turbulence (AT) limits the optical-propagation path length. In this study, the implementation of some optical amplifiers (OAs) in cascaded configuration, namely, erbium-doped fiber amplifiers, semiconductor OAs, and Raman amplifiers (RAs), are investigated through simulation. This study aims to search for the maximum link distance of an optical propagation and enhance the FSO performance caused by each configuration of OAs. The optical relaying network consists of three nodes, with each node designed with a space of several kilometers under the influence of AT. …

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