bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Improvement of a Type of Turning Machines
Authors: Zhilevski Marin Milkov , Mikhov Mikho Rachev
Published: February 2022

The basic problems in modernization of a type of turning machines with digital program control are discussed in this paper. The main requirements for the drive system are analyzed and formulated. A number of models for computer simulation with various electric drives have been developed aiming at studying their dynamic and static regimes for the respective control algorithms. Some options for performance improvement of the respective drives are presented. The experimental research carried out confirms good performance of the applied solutions. The results of this study can be used in the design and set up of such driving systems.
A Comparative Analysis of Job Scheduling for Optimum Performance of Parallel Machines by Considering the Energy Consumption
Authors: Faccio Maurizio , Nedaei Mojtaba , Pilati Francesco
Published: February 2022

In this study, a comparative analysis of scheduling of machines and jobs was conducted by proposing a method, which aims to optimize the performance of the job-shop environment. A wide range of objective functions including make-span, maximum tardiness, total flow time, total tardiness, total weighted flow time, and total weighted tardiness, and energy consumption. The decision variables of a manufacturing company including the job’s weight, stating and completion time, due dates, releasing date, and processing time were considered as inputs of the optimization model. Then, subject to the defined technical constraints of the system, a comparative analysis on the basis of eight scheduling methods was conducted to assess the performance indicators of the job-shop system. Results of the analysis revealed variations of different objective functions based on the proposed methods. The optimum make-span varied from minimum of 210 days estimated by the Earliest Due Date (EDD) method, up to 222 days estimated by the Critical Ratio (CR) method. Further recommendations were also made for optimum values of the involved decision variables in the considered job-shop environment. Results revealed that the maximum tardiness was best optimized using the EDD method, whilst the Shortest Processing Time (SPT) led to the best optimum value for the total flow time. Analysis of the energy evaluation of the machines showed that the optimum overall energy consumption has been observed with the value of 7,934 kWh for the first operating machine under the effect of the Minimum Slack method, whilst the optimum energy consumption for the second machine was observed with the value of 7,968 kWh using the First Come First Served (FCFS). Last stage of study recommended the optimum planning schedules and resource allocations of the jobs in the machines considering each scheduling method during the operation of the designed job-shop.
Vibration Protection of Mechanical Systems Consisting of Solid And Deformable Bodies
Authors: Safarov Ismail Ibrahimovich , Khudoyberdiyevich Teshaev Muhsin
Published: February 2022

In this  paper active vibration protection of mechanical systems consisting of solid and deformable bodies is considered. To actively control the oscillations of dissipative mechanical systems, a constructive method is used to determine the structure of the reaction forces of servo constraints. As an example, we consider the system with a finite number of degrees of freedom. Numerical results for various harmonic are also given.
Decentralized Control Technique Application for Effective Energy Management in Microgird Network
Authors: Omorogiuwa Eseosa , Enebieyi Martins William
Published: February 2022

Micro-grid supplied by Renewable Energy Sources is characterized by randomness and intermittency due to varying weather conditions. Moreover, increasing demand for off-Grid electricity lead  to uneven expansion of Micro-grid structures which may attract additional cost due to complex communication requirements in centralized Systems. In view of the above problems, decentralized control technique is employed in this work to effectively improve energy supplied to an inverter-Based Micro grid by Solar PV and Battery. Droop-based PWM control technique is applied to low Voltage Micro grid at a reference location for effective Energy Management Improvement. Simulations of various operating modes and weather conditions are done in MATLAB/Simulink to validate energy management improvement system. Results obtained showed that active and reactive power is shared between Inverter-connected Energy sources according to their Voltage ratings in Islanded Mode. Coordination technique of energy Management Improvement System supports true Plug and Play Functionalities as DGs can be added to the network with varying voltage Magnitude and location without pre-configuration.
Thermal Lesion of Renal Tumour as a Function of Catheter Material Property
Authors: Towoju Olumide Adewole , Petinrin Moses Omolayo
Published: February 2022

The extent of lesion achieved during microwave ablation is dependent on some factors which include the time period of application, its intensity, antenna geometry, and relative permittivity of the tissue. Several studies have been conducted on microwave ablation for the treatment of tumours and have focused on different antenna geometries, its intensity, and time of application. This work seeks to find a correlation between the relative permittivity of the catheter and the temperature distribution which determines necrosis of the tissue by using Tefzel ETFE, Teflon FEP, PFA Teflon type A,  PFA Teflon type B, Teflon AF, and PTFE Teflon type B while modelling using COMSOL Multiphysics. The extent of the thermal lesion was observed to be dependent on the relative permittivity of the catheter material, with Tefzel ETFE giving the best performance and Teflon AF providing the least.
Innovation of Curriculum Planning in Accordance with CDIO Standards at Ho Chi Minh City University of Transport
Authors: Thi Lan Anh Vu , My Vien To
Published: February 2022

The CDIO initiative provides an integral approach including CDIO frameworks and CDIO standards in hopes of realizing students’ learning purposes and of figuring out learning experiences to meet output-standard based education and training.  Many Vietnamese universities have become pilot places of CDIO implementation as a main curriculum development not only to satisfy social requirements and international standards, but also to boost creativeness and stimulate new assessment methods and improvements for the curricular. Due to requirements of all-sided and basic innovation of tertiary education ratified by Vietnamese Party and Government (phase 2010-2020), the CDIO implementation is considered as an indispensability in Ho Chi Minh City University of Transport. The paper is aimed to clarify the processes and procedures to develop curricular so as to meet social demands and international standards.  This paper also mentions the principles to introduce this curriculum innovation to university educational institutions of Vietnam once the CDIO approach is put into application and implemented.
Experimental Study of Drying Parameters of Ginger at Different Temperature and Moisture Content
Authors: Olaoye Olusegun Solomon , Ogunleye A. J.
Published: February 2022

Drying provides extended shelf life to agricultural crops in general and thus proper design of dryer will assist in drying them to acceptable level and quality. To design adequate dryer, necessary drying parameters of drying materials is necessary. This work involves experimental determination of effective drying parameters such as moisture content, moisture diffusion coefficient, density (true and bulk), specific heat, thermal conductivity and thermal diffusivity of ginger and to analyze these parameters in relation to each other. Fresh ginger rhizomes were washed to remove soil from the field, peeled and washed again in clean water and sliced into thin pieces. The sliced ginger was heat-treated by adding 200ml of clean water and steaming for 5–8 minutes in an aluminum pot, to a temperature of 85–90 oC, and a light brown colour. Microwave oven, calorimeter, desiccators, thermometers, triple beams balance, micrometer screw gauge were used to determine the drying parameters of ginger. Effect of temperature and moisture content on some thermal properties was determined. The results of the experiments shows that average initial moisture content for the ginger samples was 72.31%, the true and bulk densities of the sample increased linearly from 0.5809 to 0.6338g/cm3 and 0.7405 to 0.7972 g/cm3 respectively between the temperatures of 45 – 75 °C. The specific heat capacity of ginger varied from a minimum of 1.568kJkg-1K-1 to a maximum of 2.026kJ kg-1K-1, with temperature in the range of 45oC to 75oC and moisture content in the range of 24.43 to 46.19 % (d.b). The thermal conductivity of ginger samples varied from 0.316×10-3 to 9.763×10-4 Jm-1S-1 oC; as the moisture content and temperature increased. Thermal diffusivity of the ginger increased linearly from 3.149×10-8 to 4.438×10-8 m2s-1 for ginger with increase in moisture content and temperature. Conclusively, the experimental study analysis show that specific heat of ginger varies with temperature. Also, there is variation in length, breath and thickness of ginger when subjected to temperature. Therefore, it can be said that ginger do shrinks when it is subjected to heat.
Teaching the Basic Commands of NoSQL Databases Using Neo4j in Vocational Education and Training (VET)
Authors: Kotsifakos Dimitrios , Magetos Dimitrios , Veletsos Alexandros , Douligeris Christos
Published: February 2022

This paper presents a new pedagogical approach to the teaching of the Databases course in a Vocational Education and Training (VET) environment. We propose an exemplary teaching scenario for basic database commands using Neo4j. This approach is necessitated by the fact that many online/network environments are taught in VET without any special preparation in the corresponding laboratories. Furthermore, our article describes various technical aspects of the NoSQL software family in general and of Neo4j in particular.
Students’ Perceptions on Using a Dual Modality Programming Environment
Authors: Menounou Georgia , Pantelopoulou Stavroula , Karaliopoulou Margarita , Kanidis Evangelos
Published: February 2022

In this paper we investigate students’ outcomes regarding the use of a dual modality programming environment that combines both text mode and block mode in class. The survey targets students of the 3nd grade of Junior High School (Gymnasium) in Greece and attempts to answer research questions regarding their perceptions after a one year course using the programming environment Pencil Code. The analysis of the collected data clearly indicates that the vast majority of students have used both modes during their work. The students find the block mode easier than the text mode but prefer to modify or correct the code using the text mode. We also noticed significant correlations between the mode used and the students’ gender, their school grades and their future course choice. The findings of this study can be useful when redesigning new Informatics curricula for the secondary education.
Educational Scenario of a Technological – Vocational course, using ICTs, in the context of Constructivism, Pragmatic model and Cross-thematic integration
Authors: Savelides Socrates
Published: February 2022

In this paper an Educational Scenario of a Technological – Vocational course is documented and presented.  In this the potentials of ICTs are exploited, as management tools of the information and as back up tools of the teaching method such that Constructivist learning environments can be established inside the classroom and achieve a smooth and successful integration of the ICT in the main cognitive subject of the Technological – Vocational course, which is examined at the Higher Education entrance exams. The Scenario has characteristics of a model useful for other Technological – Vocational courses as it suggests Practical Educational Techniques and Cross-thematic integration approaches and promotes the Metacognitive skills of the Vocational Upper Secondary School (EPAL) students with a specialization.
Design of Hybrid Industrial Solar Drying Unit
Authors: Elbasher Haider A. Gadir , Abdalla Babiker Karama , Mohamed Adil Ali
Published: February 2022

This study done for designing  industrial solar air heater drying unit with tow part of experimental steps(selecting solar air hater  type and other par for controlling outlet temperature through mixing hot and ambient air through static mixture) ., The experiment done for 6 six days for each type using fabricated glass covered corrugated solar air heater with tow possibility of modifications  one of them with fixed absorber plate defined as type one and other one tested with removed absorber  plate which defined as type two  experiments done with full  accessory (air supply fans, temperature mea with same test study using device, fresh air motor controlling RPM and fabricated static mixture. The drying temperature range (45 C to 55 C).Before testing pilot unit calculation of predicted hot air temperature was done for validity of unit then the experiments has been made with pilot unit of solar air heater with fresh air steam and static condition, the result show that solar air heater type one is better for stable results for out let temperature and suitable for working. also the experiments show that, the presented value of temperature of hot mixed air of SAH type one have fitness with set point of controller 90% for day one and day two but for SAH type two the present value haven’t fitness with set point, the reading either high or low than the set temperature   , for the other part of study prove that mixing hot air from solar air heater and fresh ambient air is success and control system working properly for the propellant drying process.
Experimental Investigation of Insulating Properties of Vegetable Oil under High Voltage
Authors: Islam Sanjida , Hossain Md. Selim , Reza Md. Farhamdur , Rashid Md. Mamunur
Published: February 2022

Due to concerns over the world’s energy necessity and environmental impact of mineral oil, these conditions induce many researchers to search for substitute sources for insulating oil. Alternatives insulating oil with biodegradable characteristics, environment friendly and presented in different countries including Bangladesh such as vegetable oils have been proposed for high voltage applications. In this paper, a relative measurement of breakdown voltage through experimental investigation of coconut, mustard, soybean, and palm oil and their blend (which is available in Bangladesh and cost effective) is presented. Break down voltage was measure with different electrode configuration by changing gap distance. The results show that the blend of (50% coconut oil + 50% palm oil) got high breakdown voltage in mushroom-mushroom electrode, and other side in plane-plane type pure soybean oil got high breakdown voltage, compared with transformer oil. The presented result illustrate that the proposed mixed oil provides better performance than the rise husk oil.
Community Analysis and Water Quality of Benthic Macroinvertebrates at Gwangseok stream in Korea
Authors: Huh Man Kyu
Published: February 2022

The study was to investigate species composition and biological water quality of benthic macroinvertebrates among localities at Gwangseok stream, Jinhae city in Korea. The identified benthic macroinvertebrates were 781 individuals belonged to 19 species, 14 families, 8 orders, 5 classes and 3 phyla. The value of dominance index (DI) was varied from 0.184 (St. C) to 0.333 (St. A) with a mean of 0.235. DI was significantly different among the four regions. Beck-Tsuda's Biotic Index (BI) was varied from 7 (St. D) to 20 (St. C) with a mean of 14. Total ecological score of benthic macroinvertebrate community (TESB) was varied from 12 (St. D) to 38 (St. B) with a mean of 26.3. Average ecological score of benthic macroinvertebrate community (AESB) was varied from 1.714 (St. D) to 1.900 (St. B) with a mean of 1.821. Benthic macroinvertebrate index (BMI) ) was varied from 22.354 (St. A) to 26.474 (St. D) with a mean of 39.756. Shannon-Weaver index (H´) for mammals at the upper regions (St. A and St. B) was higher than those of low regions (St. C and St. D). Berger-Parker’s index (BPI) was varied from 0.218 (St.. C) to 0.346 (St. A). Richness (R1) was different from each other and R2 was not shown significant differences (p < 0.05). Evenness indices (E1-E5) for four stations were different from each other, however there were not shown significant differences (p < 0.05).
Ocean Energy - A Clean Energy Source
Authors: Nguyen Phuoc Quy Phong , Dong Van Huong
Published: February 2022

The world is constantly seeking new sources of energy to replace the use of coal and fossil fuels to generate electricity. And a strong source of energy from the ocean is one of the hopes of scientists around the world. Ocean energy is an endless renewable energy source for making electricity used for the world. Marine technology was once considered too expensive to be a viable source of alternative clean energy, especially compared to already developed products such as wind and solar. However, with the increased price of oil and the issues of global warming and national security, U.S. coastal sites are looking to add ocean energy to their renewable energy portfolios. This paper gives an overview of ocean energy technologies, focusing on two different types: wave, tidal. It outlines the operating principles, the status, and the efficiency and cost of generating energy associated with each technology.
Application of a Genetic Algorithm for Improving Voltage Profile with Distributed Generation
Authors: Oodo Stephen , Owolabi Felix S.
Published: February 2022

The purpose of a power grid is to transfer electrical energy from the production to the consumption, while maintaining an acceptable reliability and voltage quality for all customers. This research paper present the integration of generation based on Biogas power renewable energy source to the Distribution network and how it stabilizes the network by normalizing the fluctuating voltage at the distribution end of power system. A Genetic Algorithm model was performed and evaluation of the impact of the DG by stimulating the developed model in the system. A mathematical formulation and optimization algorithm was performed using the MATLAB/Simulink program. The results obtained were correction of the faulty buses voltages and stable power supply which is 25% better than the conventional one. It was concluded that the implementation of the optimisation technique has improved the energy efficiency of the distribution network.
Potential of Biomass Sources for Fural-Based Fuel Production in the Consideration as a Green Fuel
Authors: Nguyen Danh Chan , Dong Van Huong
Published: February 2022

In Vietnam, although quite modest, but since 1998, there have been investments in nanotechnology research. To date, many research results of nanotechnology application have been published in theory and experiment. Along with research units, the business sector also boldly applied nanotechnology in production. In this paper, the authors mention research, application, testing of fuel saving measures and emission reductions on diesel engines. It focuses on measures to improve fuel efficiency (including the use of emulsified fuels and the use of fuels containing nano-technology additives and especially the combination of the above two types) to test Control combustion in the direction of increasing capacity, saving fuel and reducing emissions. This measure has the same advantages as: it can be used on circulating engines without interfering with engine "hardware". The results contribute to the construction of technologies to produce renewable fuels from agricultural waste, to participate in solving national energy security and environmental pollution caused by agricultural wastes. The research results confirmed that rapid pyrolysis and hydrodeoxygenation are advanced and feasible technologies for converting agricultural waste biomass into liquid fuel.
Reduction of Crude Oil Production Cost in Nigerian Indigenous Company using Activity Based Costing
Authors: Osetoba Segun Adebisi , Barinyima Nkoi , Amadi Rex
Published: February 2022

The aim of this study is to investigate the impact of activity based costing in reducing crude oil production cost in Nigerian indigenous oil and gas company. This research work identified strategies to effectively reduce the cost of crude oil production by adopting a cost reduction tool for crude oil production and to establish a good crude oil flow to the surface for production. Activity based costing was the cost reduction tool used for this work. The tool helps to differentiate between value added costing and non-value added costing. Non-value added costs must be reduced or eliminated during production so as to maximise profit. Data was collected from an indigenous oil service company. The collated data were tabulated and graphs were plotted with the aid of Microsoft excel. The analysis revealed a total sum of ? 416,978,977 was wrongly spent for a duration of three years on crude oil production due to non-value added costing. The activities are: poor transportation of crude oil, that is, use of mobile tanker for haulage instead of laying 4 inches coated pipes for a distance of 5km and contracting the treatment of produced water to a contractor instead of setting up a water treatment plant. Also, using a diesel engine generator for electric power supply while gas was available as a fuel gas for natural gas consuming generator was a non-value added activity. Lastly, inadequate oil well flowing practice by flowing the well through an adjustable choke for a long period of time instead of using a fixed choke. This is a huge loss for indigenous oil producing fields operated by an indigenous oil service company in Nigeria. The loss was due to inability of the producers/field location owners to set up few equipment to meet up with complete operation standard.
Characterization of the Influence of NaOH Chemical Solution with Different Concentration on the Properties of Nano-Composite Materials
Authors: Atiyah Ibrahim A.
Published: February 2022

In this work, composites based on unsaturated polyester resin reinforced with nano-silica (0.5%, 0.7% and 1%) Sio2 were studied to determine the influence of sodium hydroxide (NaOH)  chemical solution with different concentration ( 1% , 2% , 4% ,6% and 8%) wt. for a period of 24 hours under room temperature conditions on the mechanical properties of  polymer matrix composite material. For this purpose, tensile and hardness taste were carried out, Since Polyester is one of most commonly used polymar matrix with reinforcing for advanced composites applications due to its low cost, easy handling, corrosion resistant, and flame retardant.
Recycling of (Soaking, Deliming and Retannage) Solutions in Amatong Tannery in the Sudan
Authors: Selman Rehab Ahmed , Gasmelseed Gurashi A. , Hassan Rawia S.
Published: February 2022

Tanneries use much of chemicals such as sodium sulphide ,calcium hydroxide, ammonium sulphate, acids, basic chromium sulphate bactericide and fungicide. All these substances contribute to the environment pollution, although biological and chemical treatment methods are required, but still these methods are not effective enough to reduce pollution to the international standard level required. This pollution problem has to be solved completely via recycling through all wet processes from soaking to retannage.In this study the spent solutions were recycled for soaking, deliming and retannage processes many times with addition of makeup of chemicals and water ,that normally used , The produced crust quality was tested and the results were found to be satisfactory.
Presence of Pesticide Residues in Select Commodities in Albanian Market
Authors: Mai Sofiana , Ninga Ederina , Mukaj Mimoza , Cara Magdalena
Published: February 2022

Widespread use of pesticides is linked to the development of agriculture in our country; however, the usage of this toxic compound must be controlled. The purpose of this study is to investigate pesticide residues in grape and lettuce samples from the Albanian market. From March to October 2017, we randomly collected 44 grapes and 34 lettuce samples from some region in Albania such as Tirana, Durres, Fier, Lushnje, Elbasan and Vlora. The collected sample underwent pesticide residue analysis, and pesticide extraction which was performed using ethyl acetate. Instrumental analysis was carried out in GC/MS Triple Quadrupole in multiple reactions monitoring mode. Products such as vegetables and fruits, available in our markets should be safe and controlled to limit potential risk to public health. In this study we concluded that no lettuce samples exceed the maximum residues level values for some pesticides, 19% of grape samples resulted above the MRL, and Chlorpyrifos is the most active substance found more than 0.05 mg kg-1
Comparative Analysis on Economic Viability of Independent Power Producing System in Nigeria
Authors: Udoka Christopher , Nkoi Barinyima , Oparadike Felix E.
Published: February 2022

The aim of this research is to compare the economic benefits of various types of power generating technologies such as gas turbines, wind turbines and solar energy that is suitable for power producing plants in Nigeria. The study conducts economic assessment by developing a data-intensive spread-sheet-based model. The model estimates the unit cost of electricity generated by a 10MW capacity solar photovoltaic system (PV), Wind turbine and Gas Turbine. Comparison based on investment cost and capacity charge indicated that the levelized cost of electricity (LCOEsolar) by solar PV was found to be $0.05188 per kWh with a net present value of (-$3,520,003), (LCOEwind), by Wind turbine was found to be $0.0732per kWh or with a net present cost of (-$24,486,076), while (LCOEgas) by Gas turbine was found to be $0.07214 per kWh or with a net present value of ($11,813,136). Results obtained with reference to LCOE showed that solar PV has the lowest cost of power generation, followed by gas turbine, and then wind turbine. Consequently, comparison based on decision for economic and preferable energy to invest in as well as the annual return the investment is projected to generate indicated that the internal rate of return (IRR) for both solar PV and wind turbine was found to be negative with a simple payback period of 14 and 35 years respectively, while internal rate of return (IRR) for gas turbine was found to be 18.67% with 5 years payback period. Hence, result obtained with reference to IRR and SPBP showed that gas turbine is the most economic and preferable energy generating technology to invest in since it is projected to generate 18.67% annual return from the investment in a minimum of 5 years period as compared to solar PV and wind turbine. Although natural gas-based power generation has lower upfront costs but it is vulnerable to volatile fuel prices, whereas electricity generation from renewables has higher upfront costs but provides electricity at costs that are highly predictable.
Comparative Study of Pipeline Deliverables using Deterministic and Stochastic Models
Authors: Ihendeson Ernest Oria , Ujile Awajiogak A , Leol Anthony K.
Published: February 2022

This study aim to proffer solution to the factors causing delay is pipeline construction project deliverables, it compared deterministic model (variable with certainty) and stochastic model (variable with uncertainty), with Six (6) planned project schedules of Brownfield Energy Service Limited for pipeline construction. Time assigned to critical activities, identified from a network analysis, with the aid of the Critical Path Method, expected mean time, both deterministic and stochastic duration was calculated. Program Evaluation Review Techniques (PERT), the variance and standard deviation of the critical activities were also calculated. The probability of completion of a project within a given period was gotten with PERT. Comparing the results for deterministic duration 60 days to 79 days, which is 50% compared to 64%. It was concluded that stochastic model is preferable when scheduling and executing pipeline construction projects, because uncertainties are factored into the planning and scheduling process including delays. Delays during execution stage, occurs mainly due to community related issues, equipment failures, change in job scope and work- men antics but not limited to these. This study advocates elimination of causes of delay, especially before and during project execution phase. It also suggested that every project schedule should follow an order of precedents, prerequisite, and management involvement and cooperation at all stages of the project
Ageing of Aluminum Power Connectors Based on Current Cycle Test
Authors: Moustafa Ghareeb
Published: February 2022

The effect of current cycle on the behavior of contact resistance of clamped connectors was investigated experimentally to characterize the thermal behavior of the used clamped connector and optimizing the installation procedure in order to reduce contact resistance and ensure a lower temperature during normal operating conditions. The thermal network method is used for calculating the temperature rise of the connector when loaded by a current. The method is based on substitution of the connector geometry by a circuit consisting of thermal resistances, capacitance and heat sources. The temperature rise is determined using the network simulation program PSPICE with the corresponding thermal model libraries. The validity of the obtained results has been checked by comparing the computed values with those measured experimentally. The agreement was found satisfactory
Effects of Age and Height on Chemical Properties of Yushania Alpina Grown at Injibara District, Amhara Region, Ethiopia
Authors: Tolessa Amsalu , Haile Fikremariam , Dilnesa Abraham , Desisa Buzayehu , Tantu Tegene , Gebeyhu Danel
Published: February 2022

This paper studied the chemical composition of cultivated 3, 4 and 5 year-old highland bamboo (Y. alpina) which were classified into three position (top, medium and bottom) to determined the main compositions especially cellulose, lignin, extractive and ash content. From all culms representative samples were converted to the required size of wood chips to prepared sample for chemical testing. Then the specimens prepared from bottom, middle and top portions for the three ages were used to determine the chemical properties in accordance to American Society for Testing and Materials (ASTM) standards except for cellulose test determined according to Kurschner and Hoffer method. All parameters in the experiment were expressed by percent based on dry basis. From this research, we have found small but significant increases in mean cellulose content from the base to the top of the culm at all three ages. The lignin content in Y. alpina species of bamboo is in the ranged of 23.04 to 30.03%. The mean values of the chemical constituents in 3, 4 and 5- year-old culms were 51.83, 54.94 and 49.78% for cellulose content, 28.28, 24.99 and 24.53% for lignin content, 7.8, 10.09, and 9.54% for alcohol-toluene extractive, respectively. In general, the comprehensive knowledge of the chemical components in the bamboo species will facilitate the use of the materials in the forestry industrial sector and help to enhance their utilization in the chemical and bio-chemical related industry.
Characterization of Lactic Acid Bacteria That Have Ability to Improved Number of Carnosine on Bakasang Based on I6S rRNA Gene
Authors: Lawalata Helen J. , Rungkat Jovialine A.
Published: February 2022

Diversity of Lactic acid bacteria (LAB) that have ability to improved number of carnocine on bakasang were determind by application of molecular approach. Molecular characterization of LAB was based on 16S rRNA gene sequencing.  The result  showed that one isolate lactic acid bacteria (Pediococcus sp.B.5.1)   among 9 isolates LAB exhibited the highest ability to improved number of carnocine. The molecular characterization based on 16S rRNA gene sequence showed that the Pediococcus B.5.1 isolate  clearly belonged to members of species Pediococcus acidilactici. Therefore, lactic acid bacteria with the high ability to improved number of carnosine could be found from fermented fish bakasang and make bakasang as a functional food.
Pyramidal Microwave Absorber Design for Anechoic Chamber in the Microwave Frequency Range of 1GHz to 10GHz
Authors: Orakwue Stella Ifeoma , Onu Igochi Praise
Published: February 2022

The design of microwave absorbers is directly correlated to the general performance of an anechoic chamber for its signal absorptive capabilities. However, the cost of importing the total required microwave absorber for the 5m × 4m × 3m proposed anechoic chamber in the University of Port Harcourt Nigeria is at the tune of twenty-seven thousand dollars. This research is carried out to simulate and fabricate the microwave absorber using polyurethane material and locally obtained carbon in order to reduce cost. The simulation is done using Computer Simulation Technology (CST) software for the desired frequency range of 1GHz to 10GHz. Simulation results proved to have good absorptive performance and reflectivity loss comparable to that of the conventional microwave absorber. The reflectivity performance is below -30dB across the desired frequency range. With the polyurethane material and locally obtained conducting carbon the estimated cost is five thousand five hundred dollars against the twenty-seven thousand dollars importation cost; thereby reducing the cost by more than 60%.
Comparative Analysis of a Vision Based HGR System Used for Handicapped People
Authors: Bankar Rushikesh Tukaram , Salankar Suresh
Published: February 2022

The object tracking is critical to visual / video surveillance, analysis of the activity and gesture recognition. The major difficulties to be occurred in the visual tracking are different environmental conditions, illumination changes, occlusion and appearance. In this paper, the comparative analysis of the different systems which are used to recognize the head gestures under different environmental conditions is discussed. The existing algorithm used to recognize the head gestures has some limitations. The existing algorithm cannot work under outdoor environmental conditions. The traditional camshift algorithm and unscented kalman filter are integrated and used to recognize the head gestures under outdoor environmental conditions. The unscented kalman filter is a tracking algorithm used to remove the limitations of the traditional camshift algorithm. The simulation result shows the better performance of the improved algorithm than the traditional camshift algorithm.
Enhancing Features of Cloud Computing Using Cloud Access Security Brokers to Avoid Data Breaches
Authors: Kaur Shabnam , Gupta Rajandra
Published: February 2022

Data breaches have gained widespread attention as businesses of all sizes become increasingly reliant on digital data, cloud computing, and workforce mobility. Cloud applications reduce costs and improve productivity. But it is equally important to monitor and protect data in a cloud environment. These are the questions that arise how to deal with lost visibility, unmanaged devices, and careless users. This paper explains how cloud access security brokers (CASBs) extend security to cloud applications, awareness for data breaches, providing visibility, threat protection, access control, and compliance. The key characteristics and benefits of cloud access security brokers (CASBs) are visibility, threat protection, access control and compliance are key components of this paper to extend data loss prevention (DLP). There is need to create the architecture of CABs having feature to deal with all types of Data Breaches.  The result of the study provided a secure architecture to fulfill the security needs and tracks the complex connections between enterprise infrastructure and its cloud service provider.
Corrosivity Study of Sensitized Welded and Unwelded Austenitic Stainless Steel AISI 304 in Oxidizing and Non-Oxidizing Environment
Authors: Agbokwor Silas Ezedinma , Obikwelu Daniel Oray Nnamdi , Neife Simeon Ikechukwu , Obayi Camillus Sunday
Published: February 2022

An experimental investigation was carried out to determine the corrosive impact of oxidizing and non-oxidizing environments on sensitized welded and unwelded samples of AISI 304. The selected samples were cut into several sizes. To induce sensitization, the samples were heated and soaked at 750oC at different soaking time intervals such as 30 minutes, 60 minutes, 180minutes, 300 minutes and 600 minutes  followed by water quenching [1]. The resultant sensitized weldment and unwelded samples were subjected to immersion duration test each in oxidizing (H2SO4) and non-oxidizing (HCL) media for 5, 10, 15, 20, 25, 30, 35, 40, 45, & 50 minutes respectively. From the results obtained, it was concluded that corrosion rate decreases as soaking time/immersion duration increases, at constant soaking temperature in non-oxidizing medium of hydrochloric acid (HCL). However, the corrosion rate decrease of the unwelded samples of AISI 304 in non-oxidizing medium is greater than that of their welded counterpart as immersion duration/soaking time increases. Similarly, the unwelded and welded samples of AISI 304, in oxidizing medium of H2SO4 have one common characteristic with their corrosion rate decreasing as soaking time/immersion duration increases; but, surprisingly, the welded samples are having lower corrosion rate than that of the unwelded counterpart as the immersion duration/soaking time increases between 5-15minutes; but reverses to a higher corrosion rate than their unwelded counterpart as immersion duration increases between 15-50 minutes. The results showed that each sample reacted differently in oxidizing and non-oxidizing media; hence oxidizing and non-oxidizing media impacted the materials’ properties differently. The sensitization differences of the welded and the unwelded counterpart obtained during soaking time, significantly affected their reactions in oxidizing and non-oxidizing media which led to differences in the corrosive impacts, under the same environment.
Improving Company's Environmental Performance Through Measurement Based on Analytic Hierarchy Process (AHP) Method
Authors: Haddach Abdelhay , BENFSSAHI Mouna
Published: February 2022

Currently environmental performance is a burner topic for researchers and is also one of the major concerns of business leaders. To evaluate this performance, more and more of these leaders are putting in place some management tools recommended by ISO 14000 standards, such as audits and environmental indicators. For decades, several companies have become aware the need to develop tools for evaluating their environmental performance: "it is difficult to manage what is not measured". These companies have difficulty to setting up a suitable method to evaluate their environmental performance. Several tools have been developed recently to help companies in the development of their panel of environmental performance indicators. The main objective of this paper is to present an integrated methodology to perform this evaluation, based on issues which significantly affect the environment. So, through this work, we purpose a tool which will allow the assessment of this performance.
Optimal Sizing and Sitting of Distributed Generation for Power Quality Improvement of Distribution Network
Authors: Bawa Abubakar , Uthman Muhammad , Shaibu Farouq E. , Oyewale Koledowo Saliu
Published: February 2022

The Point of Common Coupling (PCC) where suppliers’ responsibility and customers demand meet is of great concern due to increase degree of voltage variation assessment; valuable indicator of system conditions (voltage profile). Unstable condition of the power system outside operational or statutory limit, an adverse effect of nonlinear loads usually generate harmonics as well as fundamental frequency voltage variations and increase rate of power losses. These loads need to be compensated for. The major concerns of utility operations is to mitigate adverse effect of this system conditions. This research work focuses on optimal siting and sizing of Distributed Generation (DG) in a 43 bus distribution system. Power losses coupled with voltage deviation, considering objective function that compute present percentage losses in 11kV Dikko feeder, Abuja Electricity Distribution Company (AEDC), Suleja Distribution Network, Nigeria. We identified buses with poor voltage profile without DG installation and determined optimal sizing and siting of DGs where losses can be mitigated and power quality improved. ETAP version 12.6 2014 was used for load flow analysis to establish a decisive based case. The total load of the system considered was (3490 + j2700) kVA. Active and Reactive power losses in the system before DG installation were 246.300 kW and 289.903 kVAR respectively. DGs installation in the case study, has a considerable effects on loss reduction in the network. It is observed that 8.10% and 7.20% active and reactive power loss reduction was achieved while bus voltage improved by 0.4%. Genetic Algorithm Optimization techniques programmed in MATLAB 2015 software was used for optimal placement and sizing of the DG in the system.
Study on Present Scenario of Bangladesh Ship Building Industries, Underlying Problems and Probable Solution
Authors: Saki Mohammad Takiuddin , Ali Md. Naser , Martuza Mohammad Ali
Published: February 2022

We are living in a competitive world. To develop economic condition of any country, industrial sector plays a major role. There are so many industries in our country in our country. Among these sector ship building is an important activity in context of Bangladesh. Ship building industries have been located along the coastal belt and riverbanks of Bangladesh. Ship building industry generates large amount of revenues for the country. The sea borne cargo growth is increasing 6-8% per year and demand of new ship building is increasing at the rate of 3-4% per year. Considering the world market and internal market, it is assumed that Bangladesh has a bright future to elevate herself as a ship building nations in the world market and surely that factor should encourage more Bangladeshi entrepreneurs to come forward in this business. Experts say more than 55% of the world`s ship are more than 20 years old and need replacing. Globally, this small and medium sized ship market is worth around $400 billion. If Bangladesh can get 1% of this market, then it amounts to $4 billion. Our research deals with the last few condition of ship building industry in Bangladesh. We also discuss about the condition of worker and environmental pollution & underlying problems of shipbuilding in Bangladesh. Finally, we formulating some suggestion which can be taken by the government and the private sector to improve the condition of ship building industry and creating demand for our ships in the world market.
Kansei Approach in Development of Application Interface Design Based on User’s Emotional Feeling
Authors: Hadiana Ana , Permana Budi , Tjahjadi Djajasukma
Published: February 2022

The emotional feeling of User plays major role in developping a web based application software especially when designing its interface, because it is one of important part of software that has position between system and user. The better interface the better impression to attract user to use it longer. This research applied Kansei Engineering to translate what user’s emotional feeling into application interface design component in order to show what user wants about interface. Kansei words related with user emotions are used to investigate user emotions when looking at appearance of interface of software. Data questionnaires are collected and processed using multivariate analysis, and then translated into detail interface design elements. This research found that four users’ emotional feeling related to helpdesk application, and the biggest impact of emotion in designing its interface is “Harmony”.
Research Method to Calculate Cutting Force when Longitudinal Feed Centerless Grinding
Authors: Trung Do Duc , Son Nguyen Hong , Ky Le Hong , Anh Le Hoang
Published: February 2022

The paper presents the results of analyzing the relationship between cutting force components and the force components exerting on the workrest blade, the ratio of slip - acceleration of the rotation motion between the part and control wheel, translational motion acceleration of the part along the axial axis when longitudinal feed centerless grinding. From that, the method of calculating cutting force components is calculated by measuring the force components exerting on the workrest blade, the ratio of slip, cceleration of the rotation motion between the part with control wheel, translational motion acceleration of the part along the axial axis. On that basis, this research also provides orientation for the construction of a system to measure the force, acceleration, velocity components, ... Then the development direction for the next research is also mentioned in the article.
Comparative Study of ELECTRE Methods with Intuitionistic Fuzzy Sets Applied on Consumer Decision Making Case
Authors: Wu Ming-Che
Published: February 2022

This article proposes an intuitionistic fuzzy (IF) Elimination and Choice Translating Reality (ELECTRE) method to rank consumers’ alternatives ranking order with subjects’ questionnaires by using IF data and the ranking order applied the proposed method are closer to consumers their own ranking order. Moreover, the mean value of Spearman correlation coefficients are higher than 80% in each product category, and also higher than 90% at bank service product category especially. This study uses IF sets characteristics to handle uncertain decision environment and to classify the concordance and discordance sets according to their score function for measuring the degree of suitability of each alternative and also using the concept of the positive and negative ideal solutions to rank all candidate alternatives in the proposed method. Furthermore, analyzer can use this method to gain valuable information from questionnaires, and consumers rarely provide preference data directly. Additionally, an empirical study is given to illustrate the proposed method and also compared with Wu and Chen 2011’s paper which considered not only score function but also accuracy function. The results show that using the proposed method, decision makers can easily predict candidate alternatives ranking order and make decisions accurately.