bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimum Elements Selection in IRS-Assisted UAV Communications with Phase Errors
Authors: Jangsher sobia , Al-Dweik Arafat , Al-Jarrah MOHAMMAD AHMAD , Alsusa Emad , Alouini Mohamed-Slim
Published: September 2021

This letter considers minimizing the bit error rate (BER) of unmanned aerial vehicle (UAV) communications assisted by intelligent reflecting surfaces (IRSs). By noting that increasing the number of IRS elements in the presence of phase errors does not necessarily improve the BER, it is crucial to use only the elements that contribute to reducing the BER. Consequently, we propose an efficient algorithm to activate only the elements that improve the BER. The proposed algorithm has lower complexity and comparable BER to the optimum selection process, which is an NP-hard problem. The accuracy of the estimated phase is evaluated by deriving the probability distribution function (PDF) of the least-square (LS) channel estimator, and showing that the PDF can be closely approximated by the von Mises distribution at high signal-to-noise ratios (SNRs). The obtained analytical and simulation results show that using all the available reflectors can significantly deteriorate the BER, and thus, elements’ selection is necessary. In particular scenarios, using about 26% of the reflectors provides more than 10 fold BER reduction.
Identifying reusable services from collaborative activities using activity theory (AT): The Activity-Based Service Identification Framework (ASIF)
Authors: Ayalew Sertse
Published: September 2021

Qualitative data
Response of vegetable oil production to monetary policy in Nigeria
Authors: J.C. Mgbanya , J.C. Onwumere , K. Njoku , M.U. Agunannah
Published: September 2021

Monetary policy is one of the macroeconomic variables that control economy. This is why the study evaluated the response of vegetable oil production to mone- tary policy in Nigeria. Annual time series that spanned for 39 years were obtained from the database of Central Bank of Nigeria and Food and Agriculture Organisa- tion. Data obtained were analysed using descriptive statistics, quadratic trend model and ARDL model. The result indicated that the coefficient of beta 2 (B2) for vegetable oil production (9.15E-05) is positively signed at P-value > 0.1. The implication is that vegetable oil production in Nigeria experienced stagnated growth. The result showed that monetary policy determinants such as inflation rate and broad money supply made significant negative impact on vegetable oil production in Nigeria. Therefore the study strongly recommended that the mone- tary authorities should make available commercial loan for industries involved in the production of vegetable oil at the single-digit prime lending rate to encourage them to grow and expand their vegetable oil agribusiness.
EXPERIMENTAL AND FINITE ELEMENT ANALYSIS OF NONAXISYMMETRIC STRETCH FLANGING PROCESS USING AA 5052
Authors:   Department of Engineering and Technology, LNCT University, Bhopal, Madhya Pradesh 462042, India., Nikam Sachin Kumar , Jaiswal Sandeep ,   Department of Engineering and Technology, LNCT University, Bhopal, Madhya Pradesh 462042, India.
Published: September 2021

This paper deals with experimental and finite element analysis of the stretch flanging process using AA- 5052 sheets of 0.5 mm thick. A parametrical study has been done through finite element simulation to inspect the influence of procedural parametrical properties on maximum thinning (%) within the stretch flanging process. The influence of preliminary flange length of sheet metal blank, punch die clearance, and width was examined on the maximum thinning (%). An explicit dynamic finite element method was utilized using the finite element commercial package ABAQUS. Strain measurement was done after conducting stretch flanging tests. A Mesh convergence examination was carried out to ascertain the maximum percentage accuracy in FEM model. It is found through finite element simulation that the width of sheet metal blanks has a greater impact on the maximum percentage of thinning as compared to preliminary flange length, and clearance of the punch dies.
THERMODYNAMIC ANALYSIS OF WIND CATCHER WITH COOLING PADS USING SSG REYNOLDS STRESS TURBULENCE MODEL.
Authors:   Department of Mechanical Engineering, FET, University of Botswana, Gaborone, Botswana., A Agarwal , I Pitso ,   Department of Mechanical Engineering, FET, University of Botswana, Gaborone, Botswana., M.T Letsatsi ,   Department of Industrial Design & technology, FET, University of Botswana, Gaborone, Botswana.
Published: September 2021

With increase in energy requirement, the researchers are looking for energy efficient passive ventilation techniques. The current design concept is based on environment sustainability and use of renewable energy sources is preferred over conventional energy sources. The current research investigates the wind catcher design with cooling pads using techniques of Computational Fluid Dynamics. The CAD model of wind catcher is designed using Creo design software and CFD analysis is conducted using ANSYS CFX software. The CFD analysis is directed at different air inlet velocities and SSG Reynolds stress turbulence model under steady state thermal conditions for both side open design and singe side open designs. The cooling pads have successfully reduced temperature up to 1.65 degrees for single side opening and 2.86 degrees for double side opening design. Maximum air flow rate is achieved with higher air inlet velocities for both design types.
FINITE ELEMENT BEHAVIOR OF AA7075 UNDER SQUARE SHAPE OF STRIKER OF SPLIT HOPKINSON PRESSURE BAR WITH VARYING LOADS
Authors:   Department of Mechanical Engineering, National Institute of Technology Patna, Patna, 80005, India., Gupta Manish Kumar
Published: September 2021

To know the high strain rate behavior of aluminum alloy 7075 (AA7075) is very significant due to its vital uses in aviation, buildings, and automobile industries. Taylor impact test, projectile tests and split Hopkinson pressure bar are usually utilized to know the behavior of materials under high strain rate conditions. But due to lack of availabilities and very costly setups, various types of changes can’t be done easily. However, numerical simulation gives opportunity to observe the phenomena of materials under different conditions without much cost. This paper investigated the behavior of square shaped specimens of AA7075 under varying impact velocities of impact velocities of 20m/s-50m/s of square striker bar of SHPB using Abaqus. To understand the importance of shape, striker bar and specimen shape are varying from square to circular under dynamic conditions. Results obtained under varying conditions indicated that the material behavior strongly dependent to the strain rates, striker shapes and specimen shapes.
MECHANICAL BEHAVIOR OF BANANA REINFORCED EPOXY COMPOSITE BY FINITE ELEMENT METHOD
Authors:   Shri Vaishnav Vidyapeeth Vishwavidyalaya, Indore, Gupta Upendra Sharan , Tiwari Sudhir ,   Shri Govindram Sakseria Institute of Technology and sciences, Indore, Namdeo Rajeev ,   Shri Vaishnav Vidyapeeth Vishwavidyalaya, Indore, Chaturvedi Siddhartha ,   Shri Vaishnav Vidyapeeth Vishwavidyalaya, Indore
Published: September 2021

In the recent years, there is a shift in interest of engineers and researchers to natural fibres from synthetic fibres. Natural fibres have high strength, are light weight and are also inexpensive than the traditional synthetic fibres. In addition, the fibres obtained naturally are biodegradability and eco-friendly in nature. Banana fibre is a derived product by cultivation of banana fruit and thus plentiful in environment. Banana fibre is classified among the strongest naturally obtained fibre and therefore when reinforced with other few binding resins can be utilized for different applications. Epoxy resin are suitable matrix for composite creation since they have outstanding binding characteristics. The (FEA) Finite Element Analysis of epoxy-banana composite shows that the maximum value of impact, flexural and tensile load that the composite can bear is 1000 N, 900 N and 2100 N respectively. According to this investigation it can be concluded that because of their outstanding load bearing characteristics epoxy-banana composite can be utilized for several medium load industrial uses to high load industrial uses. It is observed that the composite with least volume percent of epoxy has better mechanical strength and can bear higher deformation under higher load for tensile and flexural tests and for the impact strength results, the increase in fibre % results in lower impact strength. Also, the increase in higher vol. % of epoxy results in lower stiffness and higher deflection in the specimens, except for the specimen with 40% vol. of epoxy which obtained the most optimal results.
1 DESIGN OF MODULAR ARCHITECTURE FOR EV AND HEV FOR PASSENGER CARS
Authors:   ARAI Academy, Chakan, Pune, India, Muraleedharan Midhun , Das Amitabh ,   ARAI Academy, Chakan, Pune, India, Agrewale Dr. Mohammad Rafiq ,   ARAI Academy, Chakan, Pune, India, Vora Dr. K.C. ,   ARAI Academy, Chakan, Pune, India
Published: September 2021

Hybridization is important to obtain the advantages of both the engine and motor as the sources of propulsion. This paper discusses the effect of hybridization of powertrain on vehicle performance. The Hybrid architectures are differentiated on the basis percentage of power dependency on the engine and motor. Passenger car with hybridization ratios of 20%, 40%, 60%, 80% and 100% are modelled on MATLAB/Simulink using the backward facing approach with the engine and motor specifications remaining constant. The hybridizations ratios and the energy consumption in terms of fuel and battery energy are obtained from the model and compared. Neural network is implemented to determine the fuel consumption. The outputs can be used by a system designer to determine a desirable hybridization factor based on the requirements dictated by the specific application.
3D printed patient-specific bone models for anatomy education from medical imaging
Authors:   Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore, Tamil Nadu, India, Pugalendhi Arivazhagan , Arumugam SenthilMurugan ,   Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore, Tamil Nadu, India, Ranganathan Rajesh ,   Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore, Tamil Nadu, India, Ganesan Sivakumar ,   Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore, Tamil Nadu, India
Published: September 2021

Evolution of 3D printing from medical image datasets are escalating and has widespread in healthcare applications such as anatomical models, surgical guides, and customized implants. In 3D printing, solid objects are fabricated by the frequently added the thin layers of material as per the digital model. This paper demonstrates the fabrication of 3D printed patient-specific bone models of leg and ankle foot from Digital Imaging and Communications in Medicine (DICOM) files. Processing of DICOM file is prepared by D2P (DICOM to PRINT) software and physical models are produced by Stratasys uPrint 3D printer. This 3D printed anatomical model eliminates the requirement of actual human bones, significance of preservation and mistakes in assembly of bones. The results of the study not only encourage education, surgical planning and validating medical devices but stimulate exciting innovations.
Design and Implementation of Passive Dynamic Vibration Absorber for Vibration control of rotating mass unbalanced Air Blower
Authors:   Gujarat Technological University, Ahmedabad, Gujarat, India, Sheth A. J. , Patel U. A. ,   L D College of Engineering, Ahmedabad, Gujarat, India
Published: September 2021

Frequently it is found in the industry that unbalances of the rotating components generate vibration due to centrifugal force. Here an attempt has been made to reduce vibrations caused by unbalance in the impeller of the Air Blower. The Dynamic Vibration Absorber (DVA) device is designed in such a way that optimal tuning damping factor and mass ratio were found as same as that obtained by using higher order of perturbation method. The designed DVA brings Vrms values within the limit set by ISO 10816-3 for Unlimited Long-Term Operation Allowable. More than 50% appreciable vibration reduction was measured in radial horizontal and vertical direction both at the motor drive and non-drive end.
ELEMENTAL COMPOSITION OF BIODIESEL PRODUCED BY FAST PYROLYSIS OF EUCALYPTUS LEAVES
Authors:   Research scholar, S.G.S.I.T.S., Indore (M.P.), India, Patel Ashok , Agrawal Basant ,   Professor, S.G.S.I.T.S., Indore (M.P.), India, Rawal B R ,   Professor, S.G.S.I.T.S., Indore (M.P.), India
Published: September 2021

In this study, temperature studies were studied on the production of a product from selected eucalyptus leaving samples. The bio-diesel yield from these samples was further determined using non-model methods and analytical pyrolysis-gas chromatography / mass spectrometry (Py-GC / MS). The fresh eucalyptus leaves were obtained from nearby forest of Godhra (Gujarat), India. Results of the Proximate analysis of eucalyptus leaves powder sample study shows that volatile matter, fixed carbon, ash content and moisture content are 61.70 %, 26.37%, 8.36 % and 3.57%, The results of the basic analysis indicate that the carbon, hydrogen, nitrogen, oxygen, and sulfur content is 89.17%, 7.36%, 1.01%, 1.98% and 0.26%, respectively. The higher heating value (HHV) of the biodiesel obtained from the biomass samples is 32.81 MJ/kg. Chemical composition analysis of Eucalyptus Biodiesel carried out and compared with standards. The study revealed that pyro-fuel is not only used as fuel but also can be purified and used as a commodity in the chemical and processing industries.
EXPERIMENTAL INVESTIGATION & ANALYSIS OF HEA TRANSFER CHARACTERISTICS IN AUTOMOTIVE MMC DISC BRAKE UNDER STEADY STATE AND DYNAMIC CONDITIONS
Authors:   Department of Mechanical Engineering, FET, University of Botswana, Gaborone, Botswana, A Agarwal , O.B Molwane ,   Department of Industrial Design & technology, FET, University of Botswana, Gaborone, Botswana., M.T Letsatsi ,   Department of Industrial Design & technology, FET, University of Botswana, Gaborone, Botswana.
Published: September 2021

During braking process, the kinetic energy of vehicle reduces and gets converted in thermal energy due to friction between disk and brake pads. The disk brake is used to retard the motion of vehicle by pressing brake pads against disk rotors. The frequent braking or panic braking results in overheating of brake disks which may result in brake fade. It is therefore essential to test newer materials which are more effective and possess better heat transfer characteristics than conventional cast iron material. The current research investigates the application of Al MMC material for ATV disk brake using experimental and numerical techniques. The numerical analysis is conducted on both conventional cast iron and Al MMC disk brake under steady state conditions and dynamic conditions. The dynamic condition testing involved testing of disk brake with externally flowing air at 2.5m/s and 5m/s using techniques of Computational Fluid Dynamics (CFD). The CAD model of ATV disk brake is developed in Creo design software and CFD analysis is conducted using ANSYS CFX. The turbulence model used for analysis is RNG k-epsilon. The temperature and heat flux are determined for disk brake under steady state and dynamic conditions. The results have shown that disk brake made from Al MMC possess better heat transfer characteristics as compared to conventional cast iron and cooling time also reduces with increase in external air speed.
Evaluating and ranking the circular supply chain implementation enablers
Authors:   Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India., Lahane Swapnil , Prajapati Himanshu ,   Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India., Kant Ravi ,   Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India.
Published: September 2021

This research aims to evaluate and rank the Circular Supply Chain (CSC) enablers for the effective implementation of CSC management. From the literature and input received from industrial experts, 30 CSC enablers are identified. Further, the selected CSC enablers are classified into seven main categories. This research employs the Pythagorean fuzzy analytic hierarchy process (PF-AHP) technique to prioritize the selected CSC enablers based on pairwise comparison of criteria and sub-criteria. The effectiveness of the proposed method is illustrated with the help of responses received from an Indian manufacturing industry. The result reveals that global climate pressure and ecological scarcity of resources is the most significant enabler and the environment management certifications and systems is the least important enabler. The result of the present study will assist the practitioners / decision makers in implementing CSC in manufacturing organizations by adopting the ranking obtained in a systematic way.
Experimental study on dehumidification performance of liquid desiccant system with aqueous HCO2K solution
Authors:   Department of Management Engineering, NIT Calicut, Kerala, India., M Ijas Ahmed. , Yatelly Amulya ,   Department of Management Engineering, NIT Calicut, Kerala, India., Kumar L Gangadhara Kiran ,   Department of Management Engineering, NIT Calicut, Kerala, India.
Published: September 2021

The liquid desiccant systems are one of the promising technologies in dehumidification applications. The experimental study on dehumidification performance of a counter flow structured packing liquid desiccant system is done with Aqueous HCO2K as working fluid. The HCO2K solution at different mass flow rate of air and solution is tested. The airflow rate is varied from 0.187 kg/s to 0.272 kg/s and the solution flow rate is varied from 0.053 to 0.115 kg/s. The output parameters, specific moisture change, moisture removal rate, dehumidification effectiveness and latent heat removal capacity varied in following ranges 3-4.2 g/kg of dry air, 2.4-3.1 kg/h, 0.12-0.21 and 1.7-2.1 kW respectively. Particularly when air flow rate increases from 0.187 kg/s to 0.272 kg/s the moisture removal performance improves about 11% whereas when the solution flow rate increases from 0.055 to 0.115 kg/s, improvement in moisture removal performance about 20%. The results imply that increase in solution flow rate always have the positive impact on dehumidification performance. The increase in airflow rate has the negative impact on specific moisture removal and effectiveness, but the impact is positive in case of the moisture removal rate and latent heat removal capacity. The Overall results show a promising dehumidification performance and further improvement is possible by incorporating a cooling system.
DESIGN AND ANALYSIS OF ADVANCED WALKER CUM ROLLATOR
Authors:   Department of Mechanical Engineering, Bharati Vidyapeeth (DU), COE, Pune, India, Mohite Dadaso D , Toraskar Harsh S ,   Department of Mechanical Engineering, Bharati Vidyapeeth (DU), COE, Pune, India, Chaturvedi Vibhor ,   Department of Mechanical Engineering, Bharati Vidyapeeth (DU), COE, Pune, India, Bose Neeladri S ,   Department of Mechanical Engineering, Bharati Vidyapeeth (DU), COE, Pune, India
Published: September 2021

Over the year’s walker or rollator have helped many elderly people to overcome the barrier of dependency. As the age grows, the muscles and bones suffer weakening due to lack of calcium because of which person has to depend on others for their movement. This unwanted condition creates a bad physiological and psychological impact on the victim and slowly pulls them out of all possible types of interactions with society. Thus, to make the walker more users friendly, safe, and reliable, a new design or solution is proposed. This not only addresses the problem which is prevalent in the elderly section of society but also will be helpful to people with other disabilities. The proposed design of the walker is to increase the safety and movability of the user. The design of this walker is advanced as it consists of various sensors like an Obstacle sensor, GPS, and Load Sensor. In this paper, the design and analysis of an advanced walker cum rollator is elaborated, which significantly reduces the challenges faced by the elderly and specially challenged in day-to-day life.
Modelling the Digital Supply Chain enablers using TISM and MICMAC approach
Authors:   Department of mechanical engineering, Shri Vaishnav Vidyapeeth Vishwavidyalaya, Indore, Dixit Vimal Kumar , Malviya Rakesh Kumar ,   Department of mechanical engineering, Shri Vaishnav Vidyapeeth Vishwavidyalaya, Indore, Pandey Shrikant ,   Department of mechanical engineering, Shri Vaishnav Vidyapeeth Vishwavidyalaya, Indore
Published: September 2021

The purpose of this article is to select digital supply chain enablers (DSCEs) to find its contextual relationship for successful digital supply chain (DSC) implementation. Total interpretative structural modelling (TISM) is used to develop the relationship among selected DSCEs. The findings of TISM are worked for the Matriced Impacts Croises Multiplication Appliqueeaun Classement (MICMAC) approach to identify the driving and dependence power of DSCEs. This paper identified 10 DSCEs and developed an integrated model using TISM and the FMICMAC approach. The model is used to recognize and organize the important enablers and show the direct and indirect relationship and effects of each enabler on the DSC implementation.
OPTIMIZATION OF FUSED DEPOSITION MODELING PROCESS PARAMETERS FOR MATERIAL CONSUMPTION AND MANUFACTURING TIME
Authors:   Department of Mechanical Engineering, Jawaharlal Nehru Engineering College, MGM University, Aurangabad, India, Pawar Shrikrishna , Quadri Sarfraz Ali ,   Department of Mechanical Engineering, Jawaharlal Nehru Engineering College, MGM University, Aurangabad, India, Dolas Dr. Dhananjay ,   Department of Mechanical Engineering, Jawaharlal Nehru Engineering College, MGM University, Aurangabad, India
Published: September 2021

This paper aims to explore the effect of layer thickness, infill density and build orientation on the material consumption and manufacturing time of specimens printed by the fused deposition modeling process. Specimens in accordance with ASTM Standards were printed by varying the process parameters such as layer thickness, infill density and build orientation. Time required to manufacture the part and amount of material consumed during the process are recorded. Increase in infill density results into increase in material consumption and manufacturing time. Layer thickness and build orientation also impacts manufacturing time and material consumption respectively. With increased application of FDM process, determining the process parameter to decrease the material consumption and manufacturing time shall help the FDM practitioners globally. Present work elucidates the optimization of FDM process parameters to achieve minimum material consumption and manufacturing time.
Influence of the size of walnut shell particulates on mechanical properties of epoxy-based composites
Authors:   Mechanical Engineering Department, Shri Govindram Seksaria Institute of Technology and Science, Indore, India, Shejkar Satish Kumar , Agrawal Basant ,   Mechanical Engineering Department, Shri Govindram Seksaria Institute of Technology and Science, Indore, India, Agrawal Alok ,   Mechanical Engineering Department, Sagar Institute of Research & Technology-Excellence, Bhopal, India.
Published: September 2021

In the present work, a new class of polymer composite is developed using walnut shell powder (WSP) as particulate filler in the epoxy matrix. Three different sizes of WSP are used for preparing three different sets of composites. The particle size selected is 50-micron, 75-micron, and 100-micron. In each set of composites with different particle size, four compositions i.e., 5 wt. %, 10 wt. %, 15 wt. % and 20 wt. % of the WSP is fabricated. All prepared composites have undergone testing to study the behavior of the material under mechanical loading. The different mechanical tests performed are the tensile test, flexural test, compressive test and hardness test. From the experimentation, the inclusion of WSP appreciably alters the different mechanical properties of epoxy. With the increase in the content of filler, an appreciable increase in the value of hardness and compressive strength is observed. Though, it has been seen that the tensile strength and flexural strength of the material is compromised slightly when the content of WSP increases beyond a certain limit. Further, it is observed that composites fabricated with smaller size particles give improved mechanical properties as compared to their counterparts.
MECHANICAL PROCESSES IN TRIBOTECHNICAL UNITS
Authors: Jamaladdin Aslanov Jamaladdin Aslanov
Published: September 2021

The study examined the diffusion phenomenon caused by compressive forces in tribotechnical nodes adhering to each other under high contact pressure and the mechanism of rupture of surfaces during surface fatigue. As a result, for two metal surfaces, depending on the nature of the touch, the gravitational and repulsive forces generated during the interaction in any environment are determined based on the number of touches and an analytical expression is obtained to calculate them.
Keywords: tribotechnical knot, mutual contact, diffusion phenomenon, surface attraction, molecular contact, mechanical contact.
STUDY OF THE OPERATING COLUMN IN LOCATION INSTALLATION OF THE ANCHOR DEVICE
Authors: Sevinc Abasova Sevinc Abasova
Published: September 2021

The article discusses the stress state of the casing at the site of anchoring with anchor devices, the solutions of the problem are used. In the column, in interaction with the teeth of the anchor device rams, tangential and radial stresses are determined.
Keywords: design and technological parameters, equipment, analytical calculations, anchor device, design scheme.
THE DEVELOPMENT OF A UNIVERSAL CORROSION INHIBITOR
Authors: Lala Haciyeva Lala Haciyeva , Mehin Baghirova Mehin Baghirova
Published: September 2021

In the article, in order to eliminate of the corrosion process, a universal bactericidal inhibitor was developed, based on the condensation products of aminoethylethanolamine and fatty acids. The bactericidal properties of the developed inhibitor were investigated. In wells operated on offshore platforms of O.G.E.O. on May 28, SOCSR carried out chemical and microbiological analysis of formation waters. The number of bactericidal cells of the investigated inhibitor and their vital activity indicate the bactericidal effect of its organizing advantage.
The topic posed in this article is topical and has great theoretical and practical importance.
An inhibiting composition has been developed, obtained on the basis of processing the residue of condensation products of aminoethylethanolamine and fatty acids, which have high inhibitory properties in model solutions.
The optimal conditions for the synthesis of this inhibitor have been determined.
The inhibiting properties of the composition of the new series, moreover, with a different composition in hydrogen sulfide media of oil fields of formation waters, imitating siphate-reducing bacteria, with respect to the bactericidal effect, have been established.
Keywords: corrosion, oilfield equipment, inhibitor protection, aggressive protection, aggressive environment, hydrogen sulfide, carbon dioxide, oxygen, carbonate, dispersed particle.
ELASTOPLASTIC PROBLEM FOR PERFORATED PLATE IN TRANSVERSE SHEAR
Authors: Rafail Mehdiyev Rafail Mehdiyev , Alekber Mehdiyev Alekber Mehdiyev , Rustam Mammadov Rustam Mammadov
Published: September 2021

A solution is given to the problem of transverse shear of a thin plate clamped along the edges of the holes and weakened by a doubly periodic system of rectilinear through cracks with plastic end zones collinear to the abscissa and ordinate axes of unequal length. General representations of solutions are constructed that describe the class of problems with a doubly periodic stress distribution outside circular holes and rectilinear cracks with end zones of plastic deformations. Satisfying the boundary conditions, the solution of the problem of the theory of shear plates is reduced to two infinite systems of algebraic equations and two singular integral equations. Then each singular integral equation is reduced to a finite system of linear algebraic equations.
Keywords: perforated thin plate, straight cracks with end zones, transverse bending, plastic deformation zones.
IMPROVED VALVE DESIGN SUSTAINABILITY RESEARCH
Authors: Jamaladdin Aslanov Jamaladdin Aslanov , Niyaz Zeynalov Niyaz Zeynalov
Published: September 2021

The issues of tightness and abrasion resistance of the new design of the ZMS-type valve are considered. An analytical expression was obtained to determine the relative pressure generated across the check valve of the improved valve. Checked the condition of the valve tightness and abrasion resistance. The new valve design was tested at JSCO “NEFTGAZMASH”, and as a result of the tests it was found that the new valve fully complies with these conditions.
Keywords: leakage, relative pressure, seal, improved, ZMS, abrasion resistance.
RESULTS OF RESEARCH ON THE USE OF MAGNETIC FLUIDS IN THE PROCESS OF OIL REFINING FROM TAR SANDS
Authors: Tarana Sadigova Tarana Sadigova
Published: September 2021

Despite extensive theoretical research, scientific-practical and various engineering works in the field of separation of residual oil in bituminous sands, the problem remains relevant.
For this purpose, the article considers the issue of improving the process of separation of oil from bituminous sands under the influence of physical fields.
Keywords: Bituminous sands, ferromagnetic based fluids, magnetic and electric fields, oil yield factor.
SOMEONE FIRST IN THE WORLD OF LOGIC-LOGISTICS
Authors: Zakir Rustamov Zakir Rustamov
Published: September 2021

In the article, in contrast to those who consider only one of the two historical figures with identical functions and attribute the first mention of "Logistic" to the 9th-10th centuries. AD [1], the author, studying all the facts, claims that the formation of another personality (mantig-vizier), confirmed by historical documents, is more ancient and belongs to the 17-16 centuries. BC NS. [2]. Thus, based on the event, which is described in the holy books of the scriptures Torah, the Bible and the Koran and dated 1864-1754. "Interpretation of the Pharaoh's dream", and in the literary aspect, a more common work like "Yusuf and Zuleikha" [3], the author in the economic and technical aspect proves that the founder of the above identical functions - frugality, the art of calculation and logical thinking, is "Pharaoh - Prophet Yusuf"
Keywords: logistic, logic, talent, security, reliable, guaranteed, stocking (purchase), distributes.
RISK MANAGEMENT IN MAQISTRAL GAS AND OIL PIPELINE SYSTEMS WITH POTENTIAL COST CONSTRAINTS
Authors: Oleq Dyshin, Ibrahim Habibov Oleq Dyshin, Ibrahim Habibov , Camaladdin Aslanov, Sevda Aghammadova Camaladdin Aslanov, Sevda Aghammadova
Published: September 2021

The problem of managing technical and technological risks in main gas and oil pipeline systems, subject to the possibility of limited funds allocated for the prevention and elimination of the consequences of accidents, is considered in the form of a semi-Markov decision-making model for a controlled Markov process in continuous time with the criterion of the maximum average discounted income. To find the optimal nonrandomized Markov stationary strategy, a procedure is proposed based on reducing the formulated fuzzy problem to an equivalent Boolean programming problem with deterministic constraints. To solve the resulting system of inequality constraints, an algorithm has been developed for finding basic solutions for an arbitrary number of accidents and measures to eliminate them.
The numerical implementation of the proposed approach is implemented for the real problem of risk management in the main gas pipeline with unclear cost constraints.
Keywords: semi-Markov decision-making process, Markov stationary strategy, feasibility optimization, basic solutions to inequalities.
STUDY OF HIGH CHROME WHITE SHEEP DEPENDENCE ON CARBONE QUANTITY AND ABRAZIVE CONDITIONS
Authors: Aghali Quliyev, Zaka Salimov Aghali Quliyev, Zaka Salimov
Published: September 2021

In addition to studying the properties of abrasive corrosion-resistant alloys, the article considers it important to study the abrasive corrosion-based effect of abrasive corrosion resistance of high-chromium white cast iron on the amount of carbon and the dependence of abrasive particles on carbide and particle dependence.
At the same time, the spread of white cast iron with 1.5 - 30% Mo is higher, which makes it easier to spread the processed martensite cast iron.
Açar sözlər: oil drilling equipment high chromium alloy, abrasive particle, diffusion resistance, hardness, erosion coefficient, abrasive conditions.
ANALYSIS OF THE STATE OF SERVICEABILITY IN THE PROCESS OF WEAR OF ELEMENTS DURING THE OPERATION OF OIL AND GAS PRODUCTION EQUIPMENT
Authors: Sevda Aliyeva Sevda Aliyeva
Published: September 2021

The generalized indicator of useful use, depending on the state of individual elements of oil-producing equipment, characterizes the ability of this equipment to perform its function during operation at optimal working time. The generalized indicator of the useful use of operational equipment can be described as the calculated sum of the indicator of the useful use of individual equipment elements. If, during operation, the oil-producing equipment retains its operability due to frequent replacement of its structural and non-structural elements, then such operational equipment is considered by users as outdated.
Operating equipment can be divided into 6 categories according to the indicators of suitability. The article analyzes the state of useful use of equipment and, as a result, the total utility of equipment is calculated in accordance with the indicators of useful use by category, and graphs of changes in the state of useful use are constructed. Based on the study of the graphs of the useful use of equipment, it was proposed to conduct an analysis in the following areas:
• Evaluation of the design and technological perfection of the equipment by users according to important new parameters.
• Determination of equipment compliance with wear standards during operation.
Keywords: structural element, wear theory, the usefulness of jam, categories, schedule of changes, reliability.
RESEARCH OF WORKING BENEFITS OF BEARINGS APPLICATION OF MATHEMATICAL METHOD
Authors: Sevinc Abasova Sevinc Abasova
Published: September 2021

It is known that the service life of oilfield machines and mechanisms is to a certain extent determined by the operability of friction units, the operation of which, as a rule, occurs under severe conditions (heavy loads, abrasive aqueous medium, etc.). It is also known that the determining parameters in the units of machines and mechanisms (lubricated with water) with polymer elements are specific load, sliding speed and relative clearance. In the field, these factors affect the coefficient of friction together, therefore, the study of their influence [µ = f (p, ʋ, ψ)] on the coefficient of friction is possible only with the use of mathematical modeling. We have studied the nature of the joint influence of the main operating parameters on the performance of the ison thermoplastic elastomer plain bearings.
Keywords: Operation, polymer elements, field conditions, bearings, sliding speed.
Does conformity occur during students' decision making for their careers?
Authors: Fadilla Putri Fathia , Abdullah Sri Muliati , Wu Mingchang
Published: September 2021

Students between ages 13 to 18 years old are exposed to have career development assignments of life focused on the education field such as choosing majors or career fields. Students see career decision making is always accompanied by feelings of doubt, uncertainty, and even stress. In the end, students make their choice on careers by just following the decisions of their peers, which is not necessarily the right decision for them. Their decision taken can lead to career success. The purpose of this study to determine the effect of the conformity of students' decision making for their careers. The quantitative research methods are used where the samples are 136 students of class XII. Data are obtained from the Likert scale instrument and analyzed using regression analysis. The result shows there is influence between conformity and students’ decision making for their career. The findings of the research are the categorization score of conformity is in high category with 60.29%, while the variable of career decision making is in the low category with 54.41%. Thus, the coefficient value is -0.573 (p<0.01) with an effective contribution of 32.9% and the remaining is 67.1% is determined by other variables, which are not considered in this research. This shows that the higher of conformity, so the lower of career decision making in the class XII students. Hence, this study is essential to provide a view on the importance of career decision making abilities that will affect the students' future.
Development of touristic village and creative industry in improving social welfare at Wukirsari Village, Imogiri, Bantul District
Authors: Saraswati Prihatin , Ahmad Puad Farah Najwa
Published: September 2021

The purpose of this study is to find out the role of development of touristic village and creative industry in improving social welfare on Wukirsari Village, Special Region of Yogyakarta Province (DIY Province). This research used qualitative and descriptive method. The data conveys that the development of touristic village and creative industry in Wukirsari Village brings out positive impact to its social welfare. The development consists of various productions; leather wayang puppet with tatah sungging, wedang uwuh traditional drink, bamboo crafts, and natural-dye batik. In addition, the village has distinct potentials to become a touristic village. Those distinct potentials are originated from its cultural resource, the Mataram kings’ burial ground. The obstacles regarding this research were the coaching of better-quality touristic village development and creative industry people management in order to become a competitive travel destination.
An Analysis of validity of test items in chemistry final semester examination for vocational students majoring in computer and networking engineering in Bantul Regency
Authors: Salirawati Das , Nugraheni Anggiyani Ratnaningtyas Eka
Published: September 2021

This research aims to investigate the quality of final examination test items given to the Computer and Networking Engineering students. The test items were developed by four chemistry teachers in the state vocational school (SVS) and private vocational school (PVS) in Bantul regency respectively. This research discusses on the quality of the test conducted and overall items developed by the chemistry teachers for both of SVS and PVS. The quality of the test items is measured by using four variables which are (1) material, construction, and language aspects, (2) cognitive level comparison, (3) the suitability of the materials tested to the materials covered in 2013 Curriculum, and (4) the suitability of the number of the test items given to the materials covered and time allocated. Ex-post facto research design was administered for this research. The sample of the research was taken from the final examination test items for the 10th grade vocational school students of the Computer and Networking Engineering in Bantul regency for 2017/2018 academic year. The schools that involved in this research were represented by four schools for each of the SVS and PVS. The quality of the final examination test items was measured by using the instrument that was validated by three lecturers who are specialized in chemistry education. Each variable was analyzed descriptively using performance average. For variable 1, it was found that the quality of material, construction, and language of the final examination test items for both schools’ categories were very good. For variable 2, the quality of cognitive level of the final examination test items by SVS was very poor but poor for the PVS. However, it was a reversal for variable 3, when the PVS was very good prevailed by the mean percentage of the suitability of the materials tested to the materials covered in 2013 Curriculum compared to the SVS which was only in good category. For variable 4, the suitability of the number of test items given to the materials covered and time allocated, the mean percentage in SVS was very poor but poor for PVS. In conclusion, the overall of the quality test items developed by both the SVS and PVS chemistry teachers, was in good category for variables 1 and 3, and poor for variables 2 and 4. To conclude, this research able to observe that vocational school chemistry teachers for both SVS and PVS are able to construct good quality and appropriate test items.
Application of Structural Equation Modeling (SEM) in Estimating the Contributing Factors to Satisfaction of TASKA Services in East Coast Malaysia
Authors: Kharuddin Azrul Fazwan , Azid Norazura , Mustafa Zaida , Ku Ibrahim Ku Faridah , Kharuddin Darvinatasya
Published: September 2021

This research shows the application of the Structured Equation Modeling (SEM) to obtain the best model for studying the relationship between the more efficient and accurate against the findings and the interpretation of the variables. The objectives of the study are to assess the reliability of the developed instrument and to test construct validity of the research instruments in estimating the contributing factors to TASKA service satisfaction. The proportionate stratified random sampling method was used to select a total of 61 TASKAs from three states on the east coast of Malaysia consisting of 273 parents and guardians which are currently using the TASKA services. Validity and reliability of the measurement model in the analysis using Structural Equation Modeling (SEM) method. Measurement models were data-based and fit based on the fit index (CMF) χ2 = 3230.541, with degrees of freedom (df) = 902, CMIN / df = 3.582 (≤5.0), CFI & TLI (≤0.9), and RMSEA = 0.070 (≤0.1). Based on the results obtained, all indices meet standardized metric and assessment tools have proven to be a good instrument. The results show that there are 5 factors that influence parents' satisfaction with the quality of services offered by TASKA. Analysis found that the combination of manage, grow, fees, activity and cost constitutes a strong association to estimate a complete structured equation model while supported by demographic factors such as education level, occupation, location, distance, agency, status and age of children to strengthen the TASKA selection factor. Research shows that this TASKA service model can assist as a guide in improving the existing quality for future improvement. Furthermore, it can be used as a module in providing the best quality of services to the satisfaction of parents and guardians.
Study on The Mechanical Properties of Roselle Fiber and Palm Seed Powder Reinforced Epoxy Hybrid Composite
Authors: K Sakthi Vadivel , K Vigneshwaran , C Sivaraj
Published: September 2021

Recently, due to increasing environmental concerns, scientists and researchers have been replacing synthetic fibers with natural fibers as the main component in composites. Roselle is one suitable natural fiber. The plant’s history, physical description, cultural methods, and usages were explained to further understand this potential plant. It is clear that extensive research has been performed on the fiber extraction methods, properties, and possible surface treatments of Roselle fibers to enhance its properties in the manufacturing of natural-fiber-reinforced polymer composites.Also Epoxy hybrid Palm Seed powder with Roselle fiber to strengthen the materials; however, no review has covered the properties and applications of Roselle fibers and palm seed powders in detail. Thus we have investigated Tensile, Impact, Flexural and Water absorption test of Roselle fiber and Palm Seed powder composite. Therefore, a study was performed on Roselle fiber to determine its potential to enable a better selection of materials to produce composites for potential applications in the construction and building, automotive, and aerospace industries.
Temperature Distribution Analysis of Composite Heat Sink (Pin Fin) by Experimental and Finite Element Method
Authors: A Karthick
Published: September 2021

Design of machine components plays a vital role in the field of Engineering where it includes the shape of component, size, applied loads, position and materials used. Due to the applied loads namely static, thermal and combined loads etc., the component undergoes stresses and deformations which affect the life of component and also the system. The Finite Element Method (FEM) is a numerical tool used for solving problems of engineering and mathematical problems in the fields of structural analysis, heat transfer, fluid flow, mass transport etc., For problems involving complicated geometries, loadings and material properties, it is generally not possible to obtain analytical solutions. These solutions generally require the ordinary or partial differential equations. Because of the complicated geometries, loadings and material properties, the solution can’t be obtained easily. So, in FEM the complicated shape of the component is divided in to small entities called elements. Element characteristics are studied and then all the elements are combined to make a single system of component. In the present work, Experiments have been conducted to find the temperature distribution within the pin fin made of composite metals and steady state heat transfer analysis has been carried using a finite element software ANSYS to test and validate results. The temperature distribution at different regions of pin fin are evaluated by FEM and compared with the results obtained by experimental work. The results are in good agreement and thus validated.
D.C. Magnetron Sputtering Coating on Trenches
Authors: V Srikumaran
Published: September 2021

The development and application of plasma processing such as plasma assisted CVD and PVD become highly important in various industrial fields such as microelectronics, sensors, solar cells, automobiles, cutting tools, etc.  In PVD different process are used such as Vacuum Evaporation, Electron Beam evaporation, Sputtering etc. But all processes have common limitation of one as such deposition is inline sight. It is difficult to achieve uniform coating on complex surfaces, holes and trenches. The width dimension and higher aspect ratio (Depth: width >1) of trenches generally in compatible with sputter deposition. When aspect ratio is increased, undesirable discontinuity can be observed at the lower half compared to upper half of trenches.  So that 3 axis rotation of substrate holder was designed with a stepper motors to get uniform coating on complex surfaces and holes. The angle of rotation and the speed are controlled by programmed micro controller. By positioning the surface features perpendicular to the plasma the holes, grooves are coated uniformly. The coating was characterized using X-ray diffractometer, SEM and micro hardness tester.