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  Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 253 journals)
    - CERAMICS, GLASS AND POTTERY (24 journals)
    - MACHINERY (32 journals)
    - MANUFACTURING AND TECHNOLOGY (151 journals)
    - METROLOGY AND STANDARDIZATION (3 journals)
    - PACKAGING (13 journals)
    - PAINTS AND PROTECTIVE COATINGS (5 journals)
    - PLASTICS (25 journals)

MANUFACTURING AND TECHNOLOGY (151 journals)                  1 2     

3D Printing and Additive Manufacturing     Full-text available via subscription  
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 5)
Advances in Manufacturing     Hybrid Journal   (Followers: 2)
Advances in Manufacturing Science and Technology     Open Access   (Followers: 5)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Nanotechnology     Open Access   (Followers: 7)
Appita Journal: Journal of the Technical Association of the Australian and New Zealand Pulp and Paper Industry     Full-text available via subscription   (Followers: 5)
Applied Ergonomics     Full-text available via subscription   (Followers: 9)
Asia Pacific Biotech News     Hybrid Journal   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 3)
Australian Journal of Learning Difficulties     Hybrid Journal   (Followers: 5)
Australian TAFE Teacher     Full-text available via subscription   (Followers: 1)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access  
Biotechnology     Open Access   (Followers: 5)
Biotechnology Progress     Hybrid Journal   (Followers: 20)
Building Service Engineering Research and Technology     Hybrid Journal   (Followers: 4)
Bulletin of Science, Technology & Society     Hybrid Journal   (Followers: 4)
CATTECH     Hybrid Journal   (Followers: 1)
Centaurus     Hybrid Journal   (Followers: 3)
Circuit World     Hybrid Journal   (Followers: 8)
Cold Regions Science and Technology     Hybrid Journal   (Followers: 2)
Comparative Technology Transfer and Society     Full-text available via subscription   (Followers: 1)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Composites Science and Technology     Hybrid Journal   (Followers: 34)
Comprehensive Therapy     Hybrid Journal   (Followers: 3)
Control Theory and Informatics     Open Access   (Followers: 4)
Cryoletters     Full-text available via subscription   (Followers: 2)
Design Studies     Hybrid Journal   (Followers: 17)
East Asian Science, Technology and Society: An International Journal     Full-text available via subscription   (Followers: 2)
Economics of Innovation and New Technology     Hybrid Journal   (Followers: 9)
Environmental Technology     Hybrid Journal   (Followers: 1)
Fibers     Open Access   (Followers: 6)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
foresight     Hybrid Journal   (Followers: 7)
FORMakademisk     Open Access  
Futures     Hybrid Journal   (Followers: 11)
Gender, Technology and Development     Hybrid Journal   (Followers: 5)
History and Technology: An International Journal     Hybrid Journal   (Followers: 4)
IEEE Engineering in Medicine and Biology Magazine     Full-text available via subscription   (Followers: 5)
IETE Journal of Research     Open Access   (Followers: 5)
IETE Technical Review     Open Access   (Followers: 1)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 4)
Informaci√≥n Tecnol√≥gica     Open Access  
Innovation: Management, Policy & Practice     Full-text available via subscription   (Followers: 10)
Innovation: The European Journal of Social Science Research     Hybrid Journal   (Followers: 5)
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 6)
Integrating Materials and Manufacturing Innovation     Open Access   (Followers: 7)
International Journal of Advanced Design and Manufacturing Technology     Open Access   (Followers: 4)
International Journal of Automation and Logistics     Hybrid Journal   (Followers: 1)
International Journal of Bifurcation and Chaos     Hybrid Journal   (Followers: 1)
International Journal of Biomedical Nanoscience and Nanotechnology     Hybrid Journal   (Followers: 5)
International Journal of Business and Systems Research     Hybrid Journal   (Followers: 1)
International Journal of CAD/CAM     Open Access  
International Journal of Critical Infrastructure Protection     Hybrid Journal   (Followers: 5)
International Journal of Design     Open Access   (Followers: 12)
International Journal of e-Business Management     Full-text available via subscription   (Followers: 2)
International Journal of Energy Technology and Policy     Hybrid Journal   (Followers: 6)
International Journal of Experimental Design and Process Optimisation     Hybrid Journal   (Followers: 3)
International Journal of Information Acquisition     Hybrid Journal   (Followers: 1)
International Journal of Innovation and Technology Management     Hybrid Journal   (Followers: 7)
International Journal of Innovation Science     Full-text available via subscription   (Followers: 6)
International Journal of Intelligent Transportation Systems Research     Hybrid Journal   (Followers: 5)
International Journal of Law and Information Technology     Hybrid Journal   (Followers: 3)
International Journal of Learning Technology     Hybrid Journal   (Followers: 6)
International Journal of Manufacturing Engineering     Open Access  
International Journal of Manufacturing, Materials, and Mechanical Engineering     Full-text available via subscription   (Followers: 10)
International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (Followers: 6)
International Journal of Nano and Biomaterials     Hybrid Journal   (Followers: 6)
International Journal of Physical Modelling in Geotechnics     Hybrid Journal   (Followers: 3)
International Journal of Planning and Scheduling     Hybrid Journal   (Followers: 1)
International Journal of Production Management and Engineering     Open Access   (Followers: 2)
International Journal of Quality and Innovation     Hybrid Journal   (Followers: 3)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 2)
International Journal of Service and Computing Oriented Manufacturing     Hybrid Journal   (Followers: 2)
International Journal of Social and Humanistic Computing     Hybrid Journal   (Followers: 3)
International Journal of System of Systems Engineering     Hybrid Journal  
International Journal of Technoentrepreneurship     Hybrid Journal   (Followers: 1)
International Journal of Technological Learning, Innovation and Development     Hybrid Journal   (Followers: 3)
International Journal of Technology and Design Education     Hybrid Journal   (Followers: 9)
International Journal of Technology and Globalisation     Hybrid Journal  
International Journal of Technology Intelligence and Planning     Hybrid Journal   (Followers: 1)
International Journal of Technology Management     Hybrid Journal   (Followers: 1)
International Journal of Technology Marketing     Hybrid Journal   (Followers: 3)
International Journal of Technology Transfer and Commercialisation     Hybrid Journal   (Followers: 1)
International Journal of Technology, Policy and Management     Hybrid Journal  
International Journal of Vehicle Autonomous Systems     Hybrid Journal   (Followers: 1)
International Journal of Vehicle Design     Hybrid Journal   (Followers: 6)
ISRN Metallurgy     Open Access   (Followers: 1)
ITL - International Journal of Applied Linguistics     Full-text available via subscription   (Followers: 8)
Journal for Manufacturing Science and Production     Full-text available via subscription   (Followers: 6)
Journal for New Generation Sciences     Full-text available via subscription   (Followers: 3)
Journal of Analytical Science & Technology     Open Access   (Followers: 4)
Journal of Applied Sciences     Open Access   (Followers: 5)
Journal of Control & Instrumentation     Full-text available via subscription   (Followers: 1)
Journal of Control Theory and Applications     Hybrid Journal  
Journal of Design Research     Hybrid Journal   (Followers: 9)
Journal of Engineering and Technology     Open Access   (Followers: 5)
Journal of Enterprise Transformation     Hybrid Journal   (Followers: 1)
Journal of Industrial and Production Engineering     Hybrid Journal   (Followers: 2)
Journal of Law, Information and Science     Full-text available via subscription   (Followers: 23)

        1 2     

Journal Cover Journal of Applied Sciences
   Journal TOC RSS feeds Export to Zotero [7 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 1812-5654 - ISSN (Online) 1812-5662
     Published by Asian Network for Scientific Information (ANSInet) Homepage  [30 journals]   [SJR: 0.351]   [H-I: 16]
  • Carbon Dioxide Removal by Adsorption

    • Abstract: Carbon dioxide (CO2) among other air pollutants is a major culprit to the greenhouse gases that is fueling global warming. To mitigate global warming, Kyoto Protocal urges 37 industrialized nations and European Union to reduce their greenhouse gas emissions to a level of 5.2% on average lower than those of 1990 during the period of 2008-2012. It is therefore essential to develop the CCS technologies to cope with the global demand of CO2 reduction. In this study the technologies of CO2 removal are reviewed.
      PubDate: 14 September, 2014
       
  • Palm Oil Mill Biogas Producing Process Effluent Treatment: A Short Review

    • Abstract: Biogas generation from palm oil mill effluent treatment plant is becoming the future trend for the palm oil millers. Therefore, the efficient treatment of biogas producing process effluent is equally important to minimize the detrimental effect towards human and environment. In addition, stricter regulations in the future, increasing in public awareness and towards water reuse also motivated investigation on this important topic. This study aims to discuss several treatment systems for palm oil mill biogas producing process effluent. Integrated treatment system is vital for treating palm oil mill biogas producing process effluent.
      PubDate: 14 September, 2014
       
  • Adsorptive Denitrogenation of Fuel by Oil Palm Shells as Low Cost
           Adsorbents

    • Abstract: This study reviews the suitability and effectiveness of oil palm shells as low cost adsorbents via physically activation with carbon dioxide as an adsorbent for denitrogenation of fuel under different concentrations. With hydrogen, high temperature and pressure, hydro-denitrogenation (HDN) is used to remove Nitrogen Containing Compounds (NCCs). However, the cost of HDN is increasing rapidly due to the increasing concentration of NCCs in fossil fuels. NCCs compete with sulfur compounds on the active sites of catalysts in the conventional process. Therefore, NCCs should be removed as much as possible. Thus, searching for an alternative process to remove NCCs in a cost efficient manner is very important.
      PubDate: 14 September, 2014
       
  • A Comprehensive Study on the Current Pressure Drop Calculation in
           Multiphase Vertical Wells; Current Trends and Future Prospective

    • Abstract: A reliable estimation of the pressure drop in well tubing is essential for the solution of a number of important production engineering and reservoir analysis problems. Many empirical correlation and mechanistic models have been proposed to estimate the pressure drop in vertical wells that produce a mixture of oil, water and gas. Although, many correlations and models are available to calculate the pressure loss, these models developed based on certain assumption and for particular range of data where it may not be applicable to be used in different sets of data. This study presents an investigation on the predictive performance evaluation for the reliable methods used to calculate the pressure drop in multiphase vertical wells taking into consideration the dimensions of each model. Most correlations and models created to calculate pressure drop were developed based on accurately and reliably measured flow parameters. However, it can only work best on the proposed data range. Statistical error analysis and graphical error analysis are used to analyze the variation between predicted values and actual ones. Hence, it showed most reliable methods that can perform well in different well conditions. Based on the analysis of this study, the artificial neural network models had showed better prediction accuracy and minimum number of variables even if other data beyond the range of data is used.
      PubDate: 14 September, 2014
       
  • 3D CFD Modeling and Simulation of RFCC Riser Hydrodynamics and Kinetics

    • Abstract: The riser of an industrial RFCC unit is simulated using a steady-state multi-fluid Eulerian 3D model in ANSYS FLUENT workbench 14. The comprehensive hydrodynamics model together with 7-lump kinetic model describes the flow behavior and cracking reactions inside the riser very well. The radial variation in the axial particle velocity and particle volume fraction is found. The product distribution and temperature distribution along the riser shows very good agreement with the industrial RFCC plant data.
      PubDate: 14 September, 2014
       
  • Application of Soot in the Removal of 2, 5-Dichlorophenol in Aqueous
           Medium

    • Abstract: The study aims to use, soot as adsorbent for the removal of 2, 5-dichlorophenol (2, 5-DCP) in aqueous medium. The adsorption kinetic and isotherm were studied using a variety of adsorption models. Soot, obtain from the exhaust pipe of vehicles, was a poor adsorbent with a very limited surface area. As such, the adsorption of 2, 5-DCP had to be conducted for 7 h in order to achieve equilibrium which was between the 240 and 360th min. The highest percentage of removal of 2, 5-DCP achieve was 43.9%. This showed that soot was a weak adsorbent. The experimental data showed that the adsorption kinetics and adsorption isotherm of 2, 5-DCP by soot obeyed the pseudo-second order kinetic model (R2 = 0.9985) and Freundlich isotherm (R2 = 0.9825), respectively indicating that both physisorption and chemisorptions were instrumental in the adsorption process. Characterization of the soot recovered from the exhaust pipe showed that the ash content and moisture content in soot were quite high at 4.62 and 2.50%, respectively. The SEM indicated that the soot was nanoparticle in size (>100 nm) with non-visible pores. The soot had spherical shape and tend to cluster together forming aggregates. The FTIR showed that the functional groups such as O-H, C-H and C = O groups, may have contributed to the adsorption process. The BET isotherm indicated that soot obey the type III isotherm without the presence of hysteresis loop. Although this material is not a good adsorbent, it adsorptive ability may be improved by altering its structure chemically providing a waste to wealth opportunity.
      PubDate: 14 September, 2014
       
  • Analysis of Optimal Injection Moulding Process Parameters for Thin-Shell
           Plastic Product Using Response Surface Methodology

    • Abstract: The injection molding process is used to produce thin-walled plastic products for a wide variety of applications. However, the difficulty in adjusting optimum process parameters setting may cause defects on injected moulded parts such as shrinkage. A study was conducted for the determination of the optimal injection moulding process parameters which will minimize the shrinkage defect on a thin-shell plastic product for cell phone housing component. The machine process setting in use currently caused shrinkage where variations in the dimensions of the length and width below the specification limit. Therefore the experiment is needed to identify the optimal process parameters that could be set to maintain the length and width dimensions closest to the target value with smallest possible variation. The process parameters selected in this study are the mould temperature, injection pressure and screw rotation speed. The Response Surface Method (RSM) of analysis was used for the determination of the optimal moulding process parameters. The significant factors affecting the responses were identified from ANOVA. Statistical results and analysis are used to provide better interpretation of the experiment. Verification runs with the optimal process parameter setting found by RSM determined that the shrinkage defect can be minimized.
      PubDate: 14 September, 2014
       
  • Brief Development of Underwater Autonomous Biomimetic Fish

    • Abstract: Underwater autonomous device with capability of locomotion in liquid environment has become a popular area of interest as technology closes in the gap to match with reality. However, the nature in liquid environment is complex and it is current need to overcome maneuverability, mechanism robustness, speed, operation duration and control system that still pose a major challenge. Current trend of study are experimenting on aquatic animal inspired concept to mimic the mother nature of fish swimming to provide better option for a far more dynamic and efficient technique for underwater applications. This has motivated a brief review on the fish morphology and swimming mode, the underwater biomimetic fish modelling and simulation and finally the control system development so far.
      PubDate: 14 September, 2014
       
  • Developing a Conceptual Framework for Value Oriented Environmental
           Management System (V-EMS) in Offshore Construction Projects

    • Abstract: Offshore platforms are huge steel or concrete structures used worldwide for a variety of functions including oil exploration and production, navigation, ship loading and unloading and to support bridges and causeways. Construction of these platforms represents a significant challenge to designers, planners and environmentalists. The environmental challenge is how to construct these platforms as huge as possible to satisfy all required functions but with less possible environmental impacts. Environmentalists encourage using Environmental Management System (EMS) to ensure including of environment issues in the operation of companies/businesses which perform construction processes. Operations are maintained by Business Processes Management (BPM) and Business Processes Re-engineering (BPR). Efficiency of EMS depends on these two concepts; BPM and BPR. In construction, site wise Environmental impacts Value Management (EiVM) will lead to achieve planned environmental objectives. Environmental impacts of different types of structures can be assessed by using Life Cycle Assessment (LCA) method. The efficiency of the overall environmental management depends on the degree of compatibility between EMSs of project parties and the procedure by which the project activities will be environmentally managed. This study aims at analyzing the elements required to reinforce this compatibility. It suggests a theoretical framework for Project Environmental Management (PEM) based on EMS, BPM, BPR and EiVM. It is expected that this framework will effectively tie EMS to EiVM. Such conceptual frameworks will encourage more researches about value oriented EMS.
      PubDate: 14 September, 2014
       
  • Development of a Universal Pressure Drop Model in Pipelines Using Group
           Method of Data Handling-Type Neural Networks Model

    • Abstract: This study presents a universal pressure drop model in pipelines using the Group Method of Data Handling (GMDH)-type neural networks technique. The model has been generated and validated under three phase flow conditions. As it is quite known in production engineering that estimating pressure drop under different angles of inclination is of a massive value for design purposes. The new correlation was made simple for the purpose of eliminating the tedious and yet the inaccurate and cumbersome conventional methods such as empirical correlations and mechanistic methods. In this study, GMDH-type neural networks technique has been utilized as a powerful modeling tool to establish the complex relationship between the most relevant input parameters and the pressure drop in pipeline systems under wide range of angles of inclination. The performance of the model has been evaluated against the best commonly available empirical correlations and mechanistic models in the literature. Statistical and graphical tools were also utilized to show the significance of the generated model. The new developed model reduced the curse of dimensionality in terms of the low number of input parameters that have been utilized as compared to the existing models.
      PubDate: 14 September, 2014
       
  • Absorption of Green House Gas (CO2) and Physical Properties of Aqueous
           Solutions of 2-Amino-2-Hydroxymethyl-1, 3-Propanediol and Di-Ethanolamine
           (AHPD+DEA) at Elevated Pressures

    • Abstract: Removal or capture of CO2 from various industrial streams using amine based absorption process is the most widely used process in industry around the world. This is due to flexibility and applicability of the process for different applications. In chemical absorption, the absorbed substances undergo chemical reactions with the solvents which help to achieve high loadings but on the other hand leading to excessive energy consumption to recover solvents. Therefore, any alternative absorbent that could facilitate the separation of CO2 from gas mixtures from various industrial streams, e.g., natural gas, flue gas from power plant, with high rate of reaction, high CO2 absorption, cyclic capacity and negligible volatility, making them be highly desired. For this purpose, a new class of amines which is called Sterically Hindered Amines (SHA) is experimentally investigated in blend with DEA in order to combine the desired properties of two solvents in one hybrid mixture. Due to the cyclic structure of 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD), which is one of the stericlally hindered amines, offers high rate of reaction and higher CO2 absorption which makes this solvent a potential replacement of conventional amines. Therefore, the solubility of carbon dioxide (CO2) in aqueous blends of 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD) and Di-ethanolamine (DEA), (DEA + AHPD) was measured at elevated pressure up to 1600 kPa for various hybrid mixtures concentrations. It was found that the addition of AHPD to the aqueous solutions of DEA gives significantly higher CO2 loadings at higher pressures. The influence of pressure on solubility is found to be positive. However, solubility decreases with increase of temperature. Transport properties of aqueous blends of DEA+AHPD were also measured and correlated over the wide range of temperature. The total solvent concentration was kept at 30 wt% as per industrial interest. Density and viscosity values show the decreasing trend by increasing the temperature. However, viscosity of aqueous blends increase with the addition of AHPD concentration in the aqueous solutions.
      PubDate: 14 September, 2014
       
  • Horizontal Well Cleanup Operation Using Foam in Different Coiled
           Tubing/Annulus Diameter Ratios

    • Abstract: Well cleanup operation for large diameter well with low bottomhole pressure is problematic and common cleanout fluids are not effective as a circulation fluid due to severe pressure losses and low suspension capability. So, it is required to analyze a fluid which can suspend the solid particles even at low annular velocities and efficiently clean the wellbore. Recently, the use of foam as cleaning agent has become more popular due to its low density and high viscosity which are desirable in many underbalanced operations. This study is focused to analyze the coil tubing fill cleanout with foam in horizontal annulus. The objective of this study is to investigate the effect of foam quality and velocity on fill concentration during horizontal wellbore cleanup operation at different CT/Annulus diametric ratios using Herschel Buckley viscosity model. Results showed that foam quality and velocity are the deciding factors for the fill transport. Present study also showed that for all size of fill particles, lower foam quality removes fill more efficiently than higher foam quality. It is noticed that diametric ratio has high effect on particle removal when foam quality is 70%. Surprisingly, it is found that the effect of diametric ratio on fill concentration decreases when foam quality is 90%.
      PubDate: 14 September, 2014
       
  • Biomimetic Robot Fish Modelling Base on Shark Swimming Kinematics

    • Abstract: Fundamental fish swimming kinematic by sinusoidal fit consisting of smooth amplitude modulated travelling wave h(x,t) along the fish body from the nose to tail being a construe of wave amplitude envelope f(x) and a fish tail oscillation function g(t). Improved fundamental parameters by previous workers, such as the body wave speed (C), wavelength of body wave (λ), swimming speed (U), tail beat amplitude (A) and Strouhal-Number (St) were utilized in the simulation for designing the biomimetic robotic fish. Effects of these parameters on the swimming kinematic model had been developed for comparison between the Blacktip shark and biomimetic robot fish over a single cycle with 18 iteration of full fish body motion from nose to tail. Results showed that Blacktip shark could be seen to produce a more elongated body displacement shape as compared to the biomimetic robotic fish. Doubling the swimming speed (U) had also showed insignificant body motion change though increase in tail beat frequency and reduction of tail beat amplitude (A) and wavelength (λ) was obvious. The effect of doubling the tail beat frequency had also shown similar behavior as doubling the swimming speed.
      PubDate: 14 September, 2014
       
  • Simulation of Phenol Adsorption in a Packed Bed Column

    • Abstract: Water pollution is a very persistent problem. The intensive throwing up of different toxic substances without control constitutes a real danger for humanity. Phenolic compounds are common contaminants in wastewater, generated by petroleum and petrochemical, coal conversion and phenol producing industries. The phenols are considered as priority pollutants since they are harmful to organisms at low concentrations because of their potential harm to human health. United State Environmental Protection Agency (EPA) regulations call for lowering phenol content in wastewater to less than 1 mg L-1 before discharging. This study focuses on the feasibility of using activated carbon to remove phenol from waste water in industry. Simulation by Aspen Adsorption is conducted to investigate the feasibility. Several sensitivity analyses such as changing the parameters which affected the rate of adsorption are discussed. Besides that, it is found that the scaling up of the column is not practicable in industry.
      PubDate: 14 September, 2014
       
  • Dispersion Study of Pressurised CO2 Release with Obstacles

    • Abstract: Carbon Capture and Storage (CCS) is an alternative for decreasing greenhouse gas (GHG) emissions by removing carbon dioxide (CO2) from power plants. Accidental discharges from CCS plant will result in a release of dense CO2 gas cloud to the ambience at high concentration which becomes a dominated threat to human health. However, there is a knowledge gap in assessing the release of CO2 via pipeline leakage. Thus, it is necessary to develop an accurate consequence model for CO2 release in order to demonstrate a safe layout and other safeguards. In this study, pure CO2 discharge and dispersion have been detailed out using a three-dimension model with presence of obstacles in a Computational Fluid Dynamics (CFD) software. The realizable κ-ε turbulence model was chosen for simulating the dispersion of pure CO2-air. A case study based on Kit Fox gas experiments of pure CO2 instantaneous release is developed to evaluate the discharge scenario. The results obtained from the model are compared with experimental data available in literatures and validation is achieved.
      PubDate: 14 September, 2014
       
  • Modelling of Pressure Drop and Cuttings Concentration in Eccentric Narrow
           Horizontal Wellbore with Rotating Drillpipe

    • Abstract: In drilling operations, estimation of pressure drop and cuttings concentration in the annulus is very complex due to the combination of interacting drilling parameters. Over the years, many investigators have developed empirical correlations to determine these parameters, however, the use of these correlations are limited to their experimental data range and setup and cannot be applicable to all cases. Computational Fluid Dynamics (CFD) method has been widely accepted as the best technique, not only due to its ability to handle complex multiphase flow problems but also its ability to handle unlimited number of physical and operational conditions. The present study examines the effects of annular diameter ratio, flow rate (fluid velocity), drillpipe rotation and fluid type on pressure drop and cuttings concentration in eccentric horizontal wellbore using CFD method. The annular diameter ratio varies from 0.64-0.90 with the drillpipe positioned at eccentricity of 0.623 and rotating about its own axis at 80 and 120 rpm. The drilling fluids were modelled using Newtonian and Power-Law fluids. Results show that at diameter ratio of 0.90, pressure drop is very dramatic yet, the amount of cuttings transported remained almost constant for all fluid velocities. Experimental pressure drop and cuttings concentration data compared favourably with simulation data with mean percentage error of 0.84 and 12%, respectively, confirming the validity of the current model.
      PubDate: 14 September, 2014
       
  • Stability of Water-in-Crude Oil Emulsion Using Cocamide Surfactant

    • Abstract: The formation of water-in-crude oil emulsion can be encountered in many stages such as drilling, transporting and processing of crude oil. To enhance and control these processes, it is necessary to understand the emulsion mechanisms. In this study, two types of Malaysian crude oil namely; heavy crude oil and light-heavy blended crude oil (40-60 vol%) were characterized physically to use as the oil phase. Cocaamide DEA was used as a natural surfactant. The stability of water-in-crude oil emulsion were investigated at different water volume fractions (50 and 20%) with four volume fractions of Cocamide DEA (0.2 , 0.5, 1 and 1.5%). These emulsions were tested for relative rates of water separation and for rheology studies to demonstrate the viscosity behavior on the emulsion stability. Brookfield Viscometer was used to study the effects of shear rate, temperature, rotation speed (rpm) and water content on the viscosity at varying temperature (30-90°C) and rotation speed (50-250 rpm). Results showed that higher concentration of Cocamide DEA and lower water volume fraction were effective in stabilizing the water-in-crude oil emulsion at room temperature. In addition, the viscosity of the emulsion stabilized by Cocamide DEA showed non-Newtonian behavior.
      PubDate: 14 September, 2014
       
  • New Method for Viscosity Estimation of Waxy Lube Oil/MEK-Toluene Solvent
           Composition

    • Abstract: This study presents a newly developed method to estimate the dynamic viscosity of lubricating oil feedstock/solvent composition in solvent dewaxing process, where the high normal paraffin components are to be extracted from the mixture. A reliable technique to determine the flow properties in the complex multi-component mixture depends on selecting high carbon number, from the C20 to C40 chain, as a solute and light one, bellow C20, as a liquid that matches the wax mass fraction in the light portion of the oil. The study focuses on the viscosity in the dissolution region (liquid phase) to characterize the feedstock/solvent composition behavior. The tested feedstock is ASE30 and the solvent is MEK-Toluene. The selected high carbon numbers are C33, C34 and C45, while the light one is C10. The obtained viscosity results by the proposed method were found to be in good agreement with the predicted viscosities of multi mixture components using the available mixed rules procedure reported in the literature. It can be concluded that the linkage between the solubility model and the carbon number selection could govern the characteristics of the waxy lube oil/MEK-Toluene solution.
      PubDate: 14 September, 2014
       
  • Hydrothermal Synthesis of Zeolite A Using Natural Kaolin from KG. Gading
           Bongawan Sabah

    • Abstract: Zeolite A was successfully synthesized from natural kaolin procured from KG. Gading, Bongawan Sabah. The raw kaolin was treated with sodium hexametaphosphate to remove the impurities exist in the natural kaolin. The kaolin clay undergoes metakaolinization at 800°C for 5 h transforming it into highly disordered and amorphous. The raw kaolin and metakaolin were characterized under XRF, XRD and SEM. Reaction mixture for zeolite A was obtained by mixing metakaolin and sodium hydroxide without additional silica. The reaction mixture was stirred for 30 min before hydrothermally synthesised at 100°C for 8 h. Optimum condition for the zeolite A synthesis was studied by preparing reaction mixture with varying molarity. The formation of zeolite A and sodalite was strongly influenced by the molarity of the NaOH used in the reaction mixture.
      PubDate: 14 September, 2014
       
  • Marine Propeller Geometry Characterization

    • Abstract: This study describes a non-contact methodology of characterizing marine propeller geometric properties using 3-D scanning and computer aided design application tool. The process develops a solid virtual propeller model by converting the physical model through 3-D scanning. An outboard marine propeller of ‘9.25x8J1’ has been utilized for the purpose of demonstrating the feasibility of this method. Studies showed that the geometric properties can be successfully characterized. The virtual modelling found a propeller nominal pitch distance value of 203.26 mm has an insignificant variance of 0.03% from that of the manufacturer’s design value. An average variance of 0.83% of the pitch distance across each sectional radius is also found to be insignificant as compared to the physical model.
      PubDate: 14 September, 2014
       
  • Dynamic Simulation of Hydrogen Sulfide Adsorption in a Packed Bed Column
           of Activated Carbon

    • Abstract: Petroleum has been a major energy sources to our human being in operating machine and in other usages. The high profitable petroleum is important in our daily life but before acquiring the useful products, there are also impurities such as hydrogen sulfide which is available in the crude oil that must be removed to avoid any hazard that could bring to the environment and human health. In oil refinery industry, hydrogen sulfide is commonly removed through water stripper but very little data is available on the removal of hydrogen sulfide using adsorption process. Thus, in this study, simulation modeling of adsorption of hydrogen sulfide onto activated carbon was carried out by providing respective adsorption isotherm, adsorption kinetic, mass balance and kinetic modeling. Under isothermal conditions with no pressure drop and constant velocity, the simulation had been conducted to justify the feasibility of the data provided by the industry after optimizing the size of adsorption bed that should be used. Most of the parameters should be assumed with a reasonable value in order to continue with the simulation. As a result, the actual data provided by the industry shows the feasibility of the size of adsorption bed after optimization due to the high flow rate and high hydrogen sulfide concentration.
      PubDate: 14 September, 2014
       
  • Interpretation of Adsorption Isotherm of Non Azeotropic Mixture onto
           Porous Adsorbents

    • Abstract: Adsorption isotherm is essential component in the understanding of the adsorption process. Several methods of the measurements, analysis and interpretation of adsorption from solution have been reported in the literature. Most of the measurements of adsorption isotherm from solution were involved the measurement of excess isotherm conducted at low region of sorbates concentration. Direct interpretation of excess adsorption isotherm as adsorption isotherm is always been practice. Therefore, in this study, on the measurement of the adsorption isotherm from solution of non-azeotropic organic solvent mixture onto porous adsorbents for whole range of liquid concentration was conducted. The study included the measurement of excess adsorption isotherm using conventional technique. Theoretical analysis and interpretation of adsorption isotherm from the excess isotherm were conducted using Pseudo Ideal Adsorption, Gibbs Dividing Plane Model and Langmuir-Fruendlich binary isotherm model. For organic solvents, acetone and propanol were chosen as the adsorbates due to the non-azeotropic properties in the mixture. Activated carbon and silicalite were chosen as adsorbents due to the different in their porosity such as macro porous and micro porous structure. The result of the study has revealed that the adsorption isotherm of non-azeotropic mixture onto activated carbon and silicalite can be interpreted as monolayer type of adsorption.
      PubDate: 14 September, 2014
       
  • Reflectivity of P-Wave Analysis for Fractured Reservoir Characterization
           in HTI Medium

    • Abstract: Nowadays, fracture is crucial issues for reservoir characterization because it is a main factor to control the fluid flow and has a correlation with permeability of the rock in the reservoir. Reflectivity of P-wave or known by, AVO analysis is a popular method that is used in industry to characterize the reservoir. However, for reservoir with fractures (fractured reservoir), AVO analysis for isotropy medium will give the inaccuracy result because fractures induce anisotropy so anisotropy parameter should be considered to characterize the fractures. AVOZ analysis was applied for fractures characterization including its parameter (orientation, intensity and fluid-filling) to know the behavior of fracture in HTI medium. In this study, we get that AVOZ analysis is more accurate than AVO for isotropy medium to characterize the fracture in HTI medium. In addition, by using AVOZ analysis fractures, its parameters could be characterized. Fractures that have same orientation with symmetry axis of plane will have lower anisotropy reflectivity and it will increase until the azimuth angle is perpendicular with symmetry axis.
      PubDate: 14 September, 2014
       
  • Impact of Bioturbation on Reservoir Quality: A Case Study of Biogenically
           Reduced Permeabilities of Reservoir Sandstones of the Baram Delta,
           Sarawak, Malaysia

    • Abstract: Baram Delta is one of seven geologic provinces in the Sarawak basin and is the most prolific. Bioturbation is an important source of reservoir heterogeneity and has an impact on porosity and permeability of reservoir sandstones. There is still a lack of knowledge on the impact of bioturbation on porosity-permeability characteristics of reservoir rocks in the Baram Delta therefore this study is aimed at evaluating the impact of bioturbation on porosity and permeability of reservoir rocks of the Baram Delta. Reservoir sandstones were analyzed using thin sections, spot permeability, scanning electron microscopy and energy dispersive x-ray. Sample, S1, from the studied core interval is dominated by Diplocraterion ichnofabric. S1 is highly to intensely bioturbated with bioturbation index between 60-99%. Spot permeability values range between 158-381 mD in the host sediment and 33.8-176 mD in the burrow and burrow lining, respectively. This represents a permeability decrease of 78% between host sandstone and burrow. Sediment packing activity was observed in S1. Sediment packers incorporate iron oxides, clays and organic matter from the host sandstone into burrow fills and linings, thereby decreasing isotropy and sorting of the sediments resulting in a reduction of porosity and permeability locally in the burrow relative to the host sandstone.
      PubDate: 14 September, 2014
       
  • CFD Simulation for Compact Inline Contactor for Separation of CO2 from
           Natural Gas

    • Abstract: An investigation of the selected geometry for Compact Inline Contactor (CIC) has been carried out to study the effect of geometry on the pressure drop and mass transfer rate. Ejector type geometry has been selected and two-dimensional (2D) surface has been created for gas-liquid study using CFD approach. Operating condition is maintained by using constant value for inlet pressure and flow-rate for both gas and liquid. The length of diameter ratio of mixing tube (Lm/Dm) was varied from 5, 6 and 7. At Lm/Dm = 7, pressure recovery is found to be faster than other Lm/Dm ratios. However, at Lm/Dm = 5, mass transfer rate profiles is better than others.
      PubDate: 14 September, 2014
       
  • Effect of POM on Formation Kinetics of Methane Hydrate

    • Abstract: The kinetics of formation of methane hydrate in deionised water in presence of Potassium Oxalate Monohydrate (POM) is studied in a batch reactor which is designed and built for a laboratory scale used. In this experimental study, the formation of methane hydrate in deionised water (18Ω) is investigated at fixed temperature of 273.15 K and pressures of 65, 60, 55, 50, 40 bar, respectively. The formation of methane hydrates in POM solutions are investigated by using various concentrations of POM up to 2000 ppm at temperature of 273.15 K and 65 bar presure. For methane hydrate, the induction time decreases with the increase of initial pressure due to the increase of sub cooling and driving force in the system. Moreover, experimental results show that the addition of POM reduces the induction time required for hydrate formation and significantly increases the carbon dioxide and methane uptake and these effects are concentration dependant. Furthermore, the addition of POM in the hydrate forming systems has been shown to improve the apparent rate constant of the system.
      PubDate: 14 September, 2014
       
  • Extraction of Dibenzothiophene from N-Dodecane using Ionic Liquids

    • Abstract: Deep desulfurization of fuels has attracted lot of attention from growing number of researchers due to more stringent regulations imposed on sulfur content. There is a great demand to comply the regulation in current technology (hydrodesulfurization) because it requires high pressure, high temperature and high hydrogen consumption. Furthermore, aromatic sulfur compounds are also inefficient to be removed in current technology. Ionic Liquids (ILs), as class of green solvent, actually play important role as a promising alternative for desulfurization of fuels. This study focuses on the selection of potential ILs for extraction of aromatic sulfur compound involving the effect of higher alkyl chain, different cation-anion and nitrile group incorporation.
      PubDate: 14 September, 2014
       
  • Impacts of Viscosity, Density and Pour Point to the Wax Deposition

    • Abstract: In order to overcome wax deposition problem, the better understanding of the physical characterization of crude oil is necessary. Viscosity, density and pour point are properties that ascertain handling characteristics of crude oils. In this study, crude oils from Malaysian oil fields are studied to determine their wax formation tendency for flow assurance purposes. For this study, density, viscosity and pour point of all crude oils is measured by digital den-sity meter (DMA 4500 M), advanced AR-G2 rheometer and D-97 ASTM methods, respectively. Result showed that there is linear trend between density and temperature. In general, wax precipitation and deposition has direct relationship with wax content of crude oil. Moreover, the shear rate has considerable effect on viscosity reduction. Temperature reduction causes viscosity to increase. However, it is against shear rate that tends to lower it.
      PubDate: 14 September, 2014
       
  • Solubility of Foam Surfactants in High Divalent Ions at High Temperature

    • Abstract: In Water Alternating Gas (WAG) injection processes, injected gas suffers from poor sweep efficiency due to low gas density, low gas viscosity leading to gravity segregation, override and viscous fingering. The oil recovery during the process remains low due to the problems of gravity segregation and viscous fingering. Foam surfactant is used to reduce gas mobility by increasing its apparent viscosity and improve volumetric sweep efficiency but the foam efficiency decreases in the presence of crude oil, divalent ions and high reservoir temperature. The main objective of this study is the screening of foam forming surfactants for CO2 mobility control during water alternating gas injection process in the presence of maximum divalent ions at high temperature. Alpha Olefin Sulfonate (AOS) was selected as main surfactant. Solubility test of AOS with different brine was performed at 120°C. AOS was stable in the total brine salinity of 78568 ppm with 3265 ppm of calcium ions and 1434 ppm of magnesium ions. To maximize the range of divalent ions, Lauramidopropylamide Oxide (LMDO) was blended with AOS. The solution was stable in the presence of total salinity 78358 ppm with 4082 ppm of calcium ions and 1793 ppm of magnesium ions at 120°C. The aqueous stability over a range of divalent ions and temperature was improved by blend of surfactants and this will help for generating stable foam for CO2 mobility control.
      PubDate: 14 September, 2014
       
  • Heat Transfer Energy Balance Model of Single Slope Solar Still

    • Abstract: Single slope solar still absorbs the thermal energy from sunlight to distillate polluted water into clean water in an enclosed space. Principal of heat transfer and energy balance were the governing equations for the operation of single slope solar still. A mathematical model was developed to express these thermodynamics behaviours. In the model, critical parameters had been identified, such as slope angle of glass cover, mass of water in basin and wind speed. Simulation had been carried out and results revealed the importance of the slope angle matching the latitude of the experimental location, the increasing of water mass in the basin leading to decreasing of clean water production and the presence of wind speed also increase the output only when the sunlight is still sufficient.
      PubDate: 14 September, 2014
       
  • Measurement of Isoelectric Point of Sandstone and Carbonate Rock for
           Monitoring Water Encroachment

    • Abstract: Excessive water production is one of the main problems in oilfields. Isoelectric point (IEP) is defined as the point of pH at which a solid surface, such as sandstone or carbonate rock, submerged in an electrolyte, exhibits zero net charge. Previous studies reported different values of IEP for carbonate and sandstone rocks, mostly utilizing the electrophoresis technique. Precise values of IEP for both types of reservoir rocks need to be investigated in order to interpret the streaming potential signal. Recently, streaming potential measurement has been proposed to be applied in managing oilfields. By combination of intelligent well technology and streaming potential measurement, water encroachment will be able to be detected proactively. The IEP measurement will start in low salinity (1x10-3 M), seawater salinity (0.6 M) and high salinity (5.5 M) brine solutions. The voltage measurements will be recorded continuously by National Instrument Data Acquisition System using Labview software. Values of IEP were determined from a plot of voltage against pH for every run. Measured values of IEP for both carbonate and sandstone rocks were lied in range of 9.40-9.60 and 2.2-2.8, respectively. As the pH of the flowing fluid get closer to the IEP, the surface charge becomes smaller and so does the magnitude of the streaming potential. The knowledge of the IEP values for both types of reservoir rocks plays a crucial role in understanding the ion-sorption processes at the mineral and solution interface. Having the understanding will enable the streaming potential signal to be interpreted accurately. As a result, water encroachment issue will be overcome efficiently.
      PubDate: 14 September, 2014
       
  • Integration of Rock Digital Images to Improve Carbonate Rock Physics Model
           of Offshore Sarawak

    • Abstract: It has been recognized that carbonate reservoirs is one of the biggest reserved for hydrocarbon. Clearly, the evaluation of these reservoirs is critical. For accurate reservoir characterization and performance prediction from geophysical measurements, good understanding of geophysical response of different carbonate pore types is crucial. However, carbonate rocks is difficult to characterize due to their complex pore systems. The complex depositional environment and significant diagenesis process makes pore systems in carbonates far more complicated than in clastics. Therefore, it is difficult to establish rock physics model for carbonate rock type. In this study, we evaluate the possible rock physics model of 20 core plugs of a Miocene carbonate platform in Central Luconia, Sarawak. The published laboratory data of this area were used as an input to create the carbonate rock physics models. The elastic properties were analyzed to examine the validity of an existing analytical carbonate rock physics model. We integrated the Xu-Payne Differential Effective Medium (DEM) Model and the elastic modulus which was simulated from a digital carbonate rock image using Finite Element Modeling. The results of this integration matched well for the separation of carbonate pore types and sonic P-wave velocity obtained from laboratory measurement. Thus, the results of this study show that the integration of rock digital image and theoretical rock physics might improve the elastic properties prediction and useful for more advance geophysical techniques (e.g., Seismic Inversion) of carbonate reservoir in Sarawak.
      PubDate: 14 September, 2014
       
  • Impact Behaviour of Modified Biopolymer Droplet on Urea Surface

    • Abstract: The droplet impact behaviour provides the particle coating characterization during the coating process of controlled release fertiliser. To have a good coating uniformity around the urea granules, it is necessary to enhance the wettabitily properties between the coating material and urea surface. In this study, modified biopolymer is used as the coating material for the controlled release fertilizer. Various compositions of starch:urea:borate were prepared and evaluated for the wettability properties. The wettability properties measured are the maximum spreading diameter, dynamic contact angle and surface tension. The high speed Charged Couple Device (CCD) camera was used to capture the images of this droplet impact behaviour. From this analysis, it is indicated that a composition of starch:urea:borate (50:15:2.5) has the best wettability characteristic and thus are suitable to be used as a coating material.
      PubDate: 14 September, 2014
       
  • Hydrate Equilibrium Measurement of Single CO2 and CH4 Hydrates Using Micro
           DSC

    • Abstract: In this study, the simple gas hydrate equilibrium conditions of methane and carbon dioxide in water were measured by using high pressure micro DSC (why is the advantage). The technique was chosen because it is economic, fast and accurate. In this study, the methane hydrate equilibrium conditions were measured at pressure between 35-112 bar and temperature between 276-288 K. In addition, the carbon dioxide hydrate equilibrium conditions were measured at pressure between 15-37 bar and temperature between 274-282.5 K. The measured data was compared to the available literature data and the AADT % between the measured data and predicted model was calculated. Good agreements were obtained between the measured and literature data. The AADT% between the measured data and predicted models is less than 0.07% for CH4 hydrate and 0.15% for CO2 hydrate.
      PubDate: 14 September, 2014
       
  • CFD Simulation for Bubble Nucleation Rate of Dissolved Gas

    • Abstract: The natural gas in Malaysia is high in CO2 content. The well removal of CO2 from natural gas can be carried out by using physical absorption method. CO2 will be absorbed at high pressure and desorbed at low pressure. The objective of this study was to analyze the phenomenon of CO2 desorption across a venturi nozzle. Dissolved CO2 gas bubble nucleation in water was studied by using CFD simulation. Models regarding bubble nucleation of dissolved gas and solubility in water at different pressure were written in User Defined Function (UDF) to be incorporated into FLUENT. The main parameters that affect the bubble nucleation are the pressure drop across the nozzle and the number of dissolved gas molecules in solution, which is defined by the solubility at the initial condition. The bubble nucleation rate increased exponentially with pressure drop. The highest bubble nucleation was found to be at the wall of the throat of the nozzle. No bubble nucleation can be detected for area with insufficient pressure drop. The bubble nucleation rate profile was similar as the pressure profile across the nozzle.
      PubDate: 14 September, 2014
       
  • Synthesis and Characterization of Flufenamic Ionic Liquids

    • Abstract: Active Pharmaceutical Ingredients-Ionic Liquids (APIs-ILs), when compared to Active Pharmaceutical Ingredients Hydrochloride (APIs-HCl), exhibits modified solubility, increased thermal stability and significant enhancement in the efficiency of APIs. To produce and demonstrate application of green ionic liquid form of the APIs, we prepared ammonium, phosphonium and choline couple with flufenamic acid. Their physical properties such as thermal stability, melting points and solubility were studied. Flufenamic ionic liquids undoubtedly represent a promising group of ionic liquids. As these new ionic liquids are halogen–free, it is expected that such new compounds will prove useful in further studies centered on active pharmaceutical ingredients ionic liquids.
      PubDate: 14 September, 2014
       
  • Effect of Healing Agent Concentration on Viscosity of Epoxythermoplastic
           Blend and Void Distribution of Composite Laminates

    • Abstract: Fabrication of self-healing Carbon Fibre Fabric Reinforced Polymer (CFFRP) composite laminates were carried out by hand lay-up and density was measured via water buoyancy. The results obtained from two methods were consistent showing laminates with a higher concentration of healing agent had greater void contents. Void content was also found to be higher near the edges of laminates compared to the central areas. High viscosity of the polymer blends due to the addition of thermoplastic healing agent is suspected to be the main reason for the void distribution pattern; air bubbles entrapped in laminates during fabrication are difficult to move in viscous resin during vacuum-degassing such that eventually the movement could be halted and voids accumulate near the laminate edges. The composite laminates fabricated in this study support the potential suitability for industrial applications.
      PubDate: 14 September, 2014
       
  • Effect of Sodium Hydroxide Concentration on the Mechanical Property of Non
           Sodium Silicate Fly Ash Based Geopolymer

    • Abstract: Alkali activator and materials rich in Si and Al are the requirements for the geopolymer synthesis. The common activator use is sodium hydroxide with silicate solution. There is limited literature on the mechanical property of geopolymer in the absence of silicate solution. In this study, fly ash was used as the raw material to provide Si and Al and sodium hydroxide (NaOH) as the only activator for the synthesis of geopolymer. This study describes the effect of varying the sodium hydroxide concentration with respect to curing time and temperature on mechanical properties of non-sodium silicate fly ash based geopolymer. The samples were prepared by mixing fly ash with 8, 10 and 12 M of NaOH concentration and cured in room temperature and 60°C for 1, 7 and 28 days. The highest alkali concentration of 12 M showed the fastest setting time and the highest compressive strength regardless of days of curing. The highest compressive strength obtained for curing at 60°C was 59.81 MPa and 45 min was recorded for the setting time. Meanwhile, at room temperature, the highest strength obtained was 17.71 MPa and 248 min for setting time.
      PubDate: 14 September, 2014
       
  • Optimization of Coating Uniformity Using Modified Bio-Polymer in a
           Tangential Fluidized Bed Coater

    • Abstract: This study presents the coating uniformity using modified bio-polymer in a tangential fluidized bed coater via Taguchi’s method. The study focused on the implementation of coating uniformity using modified bio-polymer toward granular urea. In this study, efficiency of mass coating per granular urea was used as indicator for coating uniformity. A series of coating experiments were carried out to determine the effect of inlet air temperature, disc rotation speed and spraying rate to the efficiency of mass coating per granular urea. An orthogonal array, the signal-to-noise ratio and analysis of variance (ANOVA) were used. Besides achieving optimal parameters for the efficiency of mass coating per granular urea, the findings explain parameters that affect the results. The confirmation run had carried out to verify the conclusion from the variance analysis.
      PubDate: 14 September, 2014
       
 
 
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