bluuebunny/crossref_metadata_2025_split huggingface dataset:
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.
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.
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.
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
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.
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.
Utilization of Limed Flesh Through Fat Extraction and Soap Preparation
Authors: Pathan Estehad , Ahmed Sobur , Shakil Saidur Rahman 
Published: February 2022

Leather industry is an export oriented industry in Bangladesh and according to the Export Promotion Bureau, in the fiscal year 2017–2018 leather sector earned US$1.03 billion by exporting leather, leather products, and footwear [1] . But it is a matter of great concern that this industry produces lots of pollution which impacts on our environment immensely. Normally thousands of kg raw cattle hide converts into 200kg finished leather [2]. Leather processing (tanning) is a complex procedure comprising of several technological steps to shield the raw hide/skin against microbiological degradation as well as to stabilize collagen with defined tanning agents which produce a significant amount of waste. Wastes originate from all stages of leather manufacturing, such as tiny particles, residues from various tanning stages and reagents from different waste liquors comprising of cuttings of raw hides and skins , trimmings and shavings, fleshing residues, solid hair debris [3]. In this conversion process the amount of total solid waste produces is about 450-550kg. This work is intended to develop a fat extraction method from the limed flashings for soap production. In leather processing, just after washing, following the liming process, swollen pelts (lime treated hide/skin) have to pass through an operation to remove the remaining fat and flesh from the flesh side in order to improve the diffusion of chemicals into pelt is known as fleshing. Generally, fleshings are kept indiscriminately nearly the industrial area as green, which has an adverse effect on the environment including human health. It contains a considerable amount of fat, which could be great source raw materials for soap. The process could be optimized for large scale production, which would be allowed to produce a new product for the commercial use. The approach could also contribute a significant reduction in the environmental impact of inevitable solid waste and decrease the costs associated with disposal.
Anion-Exchange Membrane with Poly(3,3’-(hexyl) bis(1-vinylimidazolium) bromide)/PVC Composites Prepared by Inter-polymerization
Authors: Kim Soo-Yeoun , Kim Woonjung , Choi Seong-Ho 
Published: February 2022

The advanced anion-exchange membranes with the poly(3,3’-(hexyl)bis(1-vinylimidazolium)bromide), PHVB, was synthesized by inter-polymerization of a 3,3'-(hexyl)bis(1-vinylimidazolium) bromide in poly(vinyl chloride), PVC, solution. We confirmed the successful preparation of the advanced anion-exchange membrane (AEM) such as ionic conductivity (S/cm), water uptake (%), ion-exchange capacity (meq/g), vanadium permeability, thermal properties, and SEM analysis, respectively. The vanadium redox flow battery (VRFB) performances using the prepared AEM based on PHVB/PVC composite polymers in organic electrolytes was examined. In the prepared advanced AEM, the maximum voltages reached 2.5 V under the fixed current value of 0.005mA. The synthesized advanced AEM has also good stability with organic electrolyte by battery performance under 1000 cycles. As results, the advanced AEM based on PHVB/PVC prepared by the inter-polymerization is suitable for use as a battery separator in VRFB.
Tannery Solid Waste into Wealth by Non-Edible Gelatin Production from Raw Trimmings
Authors: Shakil Md. Saidur Rahman , Ahmed Sobur , Pathan Estehad 
Published: February 2022

During the conversion of raw hides or skins into leather involves generation of enormous amount of solid waste which has been major concern for environment and cause detrimental effect on it. In leather industry solid wastes can be generated almost from all operations including pre-tanning, tanning, and even post tanning operation. Solid wastes are mainly raw trimmings, fleshing, chrome shaving, buffing dust, keratin, finished scraps etc. The economic development of a country depends on the utilization of indigenous raw materials and their by-products. This paper focuses on utilization of raw trimmings into useful product like non edible gelatin those demand is going up day by day due to its versatile application in various fields. Raw trimmings are mainly originated during sorting of leather before actual tanning process happens and best for non- edible gelatin production as it does not contain any harmful chemicals. This study will also describe the chemical properties of gelatin, gelatin manufacturing process, manufacturing parameters from the leather wastes like raw trimmings. Optimum extraction of non-edible gelatin from raw trimmings found at 75-85?C for 12 hours in slightly basic condition. This study found that huge amount of raw trimmings which generally thrown directly to environment can serve as potential raw materials for the manufacture of non-edible as well as edible gelatin.
Vibration Analysis of A 3-Bladed Marine Propeller Shaft for 35000DWT Bulk Carrier
Authors: Madokuboye Asima , Ogbonnaya Alfred E. 
Published: February 2022

Vibration Analysis of a 3-bladed Marine Propeller shaft for 35000 DWT Bulk Carrier was carried out. The objectives of the analysis were mathematically designing the 3-bladed propeller shaft, carrying out computer aided design of the shaft and numerically performing vibration analysis. The methodology include mathematically designing the marine propeller and the corresponding shaft, manual calculation of the natural frequency of the shaft, using solidworks to design the shaft and numerically performing vibration analysis on the designed shaft using Analysis System (ANSYS) software. Hub (boss) diameter of 0.17m was calculated. The hollow shaft has external and internal diameters of 0.10m and 0.09m respectively. Torques of 202Nm2 and 384.72Nm2 were obtained at the driver and driven shafts respectively. The natural frequency calculated manually was 249Hz while that of the ANSYS was 280Hz which gives an error of 12%. However, the numerical analysis carried out with ANSYS software also showed that a phase difference of 1800 occurs at the frequency of 280Hz which is a signal of possible misalignment of shaft. At this frequency, the displacement of the shaft has a maximum value of 7.87 . Reaction forces from the components of the shaft were also observed to play major role in the vibration of the propeller shaft. These reaction forces, which cause wearing of the stern tube and intermediate bearings due to friction, are represented by phase angles closer to zero degree. Wear due to friction is a major source of shaft misalignment.
Automated Estimation of Coastal Bathymetry from High Resolution Multi-Spectral Satellite Images
Authors: Wijesundara Anusha , Rathnayake R. M. D. I. 
Published: February 2022

Coastal bathymetry is the most essential tool for marine planning, monitoring and management, modelling, nautical navigation and scientific studies of marine environments. The techniques have been developed over the last decade to derive bathymetry using remote sensing technology with efficiently and low costly. Log linear bathymetric inversion model and non-linear bathymetric inversion model provides two empirical approaches for deriving bathymetry from multispectral satellite imagery, which have been refined and widely applied. This paper compares these two approaches by means of a geographical error analysis for the site Kankesanturai using WorldView-2 satellite imagery. In order to calibrate both models; Single Beam Echo Sounding (SBES) data in this study area were used as reference points. Corrections for atmospheric and sun-glint effects are applied prior to the water depth algorithm. The algorithm was tuned and both models were calibrated by performing the necessary algorithm with available single beam echo sounding data in the study area. The coefficients of standard R2 is estimated as 0.846 for log-linear and 0.692 for non-linear model. Log linear model performs better than the non-linear model. The model residuals were mapped and the spatial auto-correlation was calculated based on the bathymetric estimation model. A spatial error model was constructed to generate more reliable estimates of bathymetry by calculating the spatial autocorrelation of model error and integrating this into an improved regression model. Finally, the spatial error model improved the bathymetric estimates of R2 up to 0.854 for log-linear and 0.704 non-linear model respectively. The Root Mean Square Error (RMSE) was calculated for the different depth ranges and also for all reference points. The overall accuracy for the log linear and the non-linear inversion model after the geographical error analysis is estimated as ±1.532 m and ±2.089 m for this study. The spatial error model improved bathymetric estimates than those derived from a conventional log-linear and non-linear technique although these methods perform very similar estimates overall.
Thermal Properties of Beef Tallow/Coconut Oil Bio PCM Using T-History Method for Wall Building Applications
Authors: Thaib Razali , Amin Muhammad , Umar Hamdani 
Published: February 2022

Thermal energy storage using Phase Change Materials (PCM) is now widely applied to wall buildings. In general, PCM which is used for applications on building walls is organic PCM and has temperature range from 0? to 65oC. Beef tallow and coconut oil is a type of organic PCM known as Bio PCM needs to characterize by using the T-History Method. The T-History method is more accurate than Differential Scanning Calorimetry (DSC) and Differential Thermal Analysis (DTA). This study aimed to determine the thermal properties of beef tallow/coconut oil PCM using the T-History method. The beef tallow and coconut oil as bio PCM material was used in this study with the variation are respectively: 100%, 70+30%, 60+40%, and 50+50%. Tests are carried out using the T-History method. From the results of testing and analysis obtained supercooling temperature, melting temperature, specific heat, and latent heat for bio PCM beef tallow/coconut oil. The effect of adding coconut oil mixture to beef tallow caused a decrease in melting temperature and supercooling temperature, while the specific heat and latent heat of bio PCM of beef tallow/coconut oil ranged from 2.96-2.19 kJ/kg.? and 101.05-72.32 kJ/kg. The result obtained that this bio PCM material of cow beef tallow/coconut oil can apply, as additional material in wall building applications.
Free Convection in a Triangular Cavity Filled with Hybrid-Nanofluid along with Sinusoidal Heat
Authors: Hasan Md.Rakibul , Uddin Md. Borhan , U. Ahmed M. 
Published: February 2022

A numerical study on convective heat transfer of hybrid nanofluid packed in a right angled triangular cavity heated by a sinusoidal temperature maintained from lower side and subjected to a constant magnetic field have been studied in this work. The hypotenuse side of the triangular cavity has been kept in uniform cool temperature while the remaining side is insulated. The governing equations of the problem have been discretized numerically with help of finite element method. A fixed Prandtl number Pr=6.2 has been used for the numerical solution. Several values of Rayleigh number Ra=102-106 , and Hartmann number Ha=0-100 which are the non-dimensional governing parameters have been examined. The volume fraction =0.01, 0.05, 0.1 and the heat generation parameter Q = 1 have been taken for this work. Calculate and the graph of Nusselt number corresponding to different parameters have been presented. The results show that Nusselt number has been decreasing function of nanoparticles Rayleigh number and also it is a decreasing function of Hartmann number. Obtained results has been compared with previously obtained data by other authors.
Adaptive and Robust Second Order Sliding Mode Controller Dedicated to Nonlinear Uncertain Pendulum Application System
Authors: Dhouibi Hedi , Ghabi Jalel , Selmi Tarek 
Published: February 2022

The research work presented within this paper deals with an innovative second-order sliding mode control (SOSMC) allocated to adaptive gain and associated with nonlinear systems subject to unknown but bounded uncertainties. The derived controller guarantees the control gain dynamical adaptation for the sake of counteracting the system’s uncertainties and to mitigate the chattering phenomenon. The Lyapunov method is also used to analyses the stability of any closed loop system (CLS) within a finite-time under bounded uncertainties assumptions. To assess how effective is the approach considered within this paper, the adaptive controller has been carefully studied on a benchmark of nonlinear systems on a damped overturned pendulum.