bluuebunny/crossref_metadata_2025 huggingface dataset:
The Problem of Organization and Industry after Using ERP
Authors: Subpratatsavee Puchong , Tiensai Chutimon
Published: April 2015

Current industrial manufacturing or agencies tend to adopt ERP systems into applications to enhance the work of the administration of the organization. The use the ERP system is not easy. They also have to endure the force of employees in an organization that does not change the original work. To the development of corporate ERP is slow. This research focuses on the analysis of problems and issues that come up that I use the ERP system ERP reason to successfully injected problems in the organization.
Keys for Redesign Industrial Facilities in a Current Productive Environment
Authors: Carrizosa I. Pablo , Rubio M. Oliver , Mora O. Julián , Guarín G. Álvaro
Published: April 2015

Today companies don’t have time and resources availability to stop their production to evaluate new layout and strategies, unless the results are guaranteed. Developing or redesigning products, gathering them in a product family and creating product platforms can be expensive tasks that represent a meaningful outlay for companies if they don’t have the adequate tools in order to facilitate the work. Thus, it is important to define the most appropriate manufacturing system as well as the performance of the chain value and the equipment layout in order to achieve an optimal production with the best quality and the shortest times and production costs. Therefore, computational tools, validated by working strategies and philosophies as Lean Manufacturing (LM) and Product Lifecycle Management (PLM) become necessary. After the evaluation of products, the value chain and the layout, these tools allow the construction of models and simulations as dynamic Value Stream Map (dynamic VSM), to analyze the actual process functioning or future process plans and PLM software, to estimate production flows, equipment and human labor requirements without stopping the normal production activities and providing competitive advantages to the company.
Research on Strategic Supplier Selection and Evaluation Method of Manufacturing Enterprise Based on AHP-GCA Method
Authors: Wu Bang Lei , Chen Xiao Juan , Yu Jing , Sun Qing
Published: April 2015

With application of intelligence technology in the manufacturing industry, the supply chain of manufacturing industry is more and more competitive. Strategic supplier is becoming more and more key element for the success of manufacturing enterprise. At present, there are many methods on selection and evaluation of strategic supplier of manufacturing enterprise. Analytical hierarchy process and grey correlation analysis is method which is used to choose strategic supplier of manufacturing enterprise by building optimum reference date and solving grey correlation degree. These have great effects in the enterprise practice in the aspects of qualitative diagnosis, quantitative diagnosis and grey information processing.
Research on Strategic Supplier Selection and Evaluation Standard System of Manufacturing Enterprise
Authors: Wu Bang Lei , Yu Jing , Sun Qing
Published: April 2015

With the market competition aggravating, strategic supplier of manufacturing enterprise is becoming more and more critical for the success of manufacturing enterprise. It plays decisive role in the areas of product quality, date of delivery, service, etc. At present, there are many methods on selection and evaluation of strategic supplier of manufacturing enterprise. But, there lacks of integral system. Through the establishment of outsourcing criteria to supplier classification based on products, this paper builds selection and evaluation standard system of strategic supplier of manufacturing enterprise in order to provide reference to manufacturing enterprise on choosing strategic supplier.
Modelling of the Influence of a Pointed Field Emission Cathode Design from the Silicon Carbide with Graphene Film on the Electric Field Strength
Authors: Svetlichnyi Alexander M. , Ageev Oleg. A. , Volkov Evgeny Yu. , Jityaev Igor L. , Dem'yanenko Maxim V.
Published: April 2015

Graphene film on silicon carbide is considered to be promising material for high-frequency vacuum nanoelectronics. However, the possibility of graphene application in this area is still poorly understood. We have carried out the simulation of the electric field distribution in interelectrode gap of the anode-cathode system pointed field emission cathode based on silicon carbide with graphene film on its surface subject to the rounding-off radius of the top, interelectrode gap, height and cathode forming half-angle of the cone opening by the finite element method. The influence of constructional parameters on the electric field strength in the test structure was analyzed. It is shown that the values of rounding-off radius of the cone point and interelectrode distance has the biggest influence on the electric field in the investigated structure. Changing of the height and cathode forming half-angle of the cone opening does not lead to a significant increase or decrease of the electric field value.
Removal of Ammonia Nitrogen from Domestic Wastewater Using Vertical Aerated Limestone Filter
Authors: binti Hamdan Rafidah , Ibrahim Izzati Izwani , Abdul Talib Ain Nabila
Published: April 2015

Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. Excessive concentrations in the water body can cause excessive growth of algae and other plants, leading to accelerate eutrophication of lakes, and occasional depletion of dissolved oxygen. To remove nitrogen conventionally from domestic wastewater requires a high cost technology due to consumption of chemicals, high operational and maintenance cost. Therefore, an alternative low cost treatment technology particularly for nutrient removal including nitrogen removal system has been developed to improve the final effluent quality that is an aerated rock filter system. However, the optimization study under warm climate has not yet been developed. Hence, the present study was carried out to investigate the removal of ammonia nitrogen (AN) from domestic wastewater through nitrification process using a lab-scale vertical aerated limestone filter. Domestic wastewater sample used in this study was collected from Taman Bukit Perdana Wastewater Treatment Plant (WWTP), Batu Pahat, Johor owned by IWK. The experiment has been carried out for 10 weeks. The influent and effluent of the vertical aerated limestone filter system have been sampled and analyzed on biweekly basis for selected parameters including AN, Total Kjedhal Nitrogen (TKN), pH, alkalinity, temperature and dissolved oxygen to monitor the effectiveness of the filter. Results from this study show that nitrification process has took place within the aerated limestone filter as the results from laboratory experiments show that AN in wastewater was oxidized to nitrate and efficiently removed as the removal of AN was ranged from 85 % to 92 % and the removal percentage of TKN was ranged from 83.52 % - 91.67 %. The temperature was in the average of 26.3oC±0.75, pH value average of , DO was from 6.64 mg/L to 7.75 mg/L , and the alkalinity was from 15 to 110 mg / l as CaCO3 . Therefore, from this study it can be concluded that aerated rock filter system has high potential in removing AN and TKN. It is also able to produce a good final effluent quality which is comply with the effluent requirement for nutrient removal in wastewater under the Environmental Quality Act (Sewage) Regulations, 2009 that is safe to be released to the water body.
Study of the pH Effects on the Phosphorus Removal Mechanism in Lab-Scale Electric Arc Furnace Slag and Limestone Filters in Synthetic Wastewater
Authors: Wan-Mohamed Wan Afnizan , binti Hamdan Rafidah , Othman Norzila
Published: April 2015

Eutrophication as a result of uncontrolled phosphorus (P) concentration that is released in wastewater has emerged as a major problem nowadays. Treatment of P demands high costs specifically to its chemical and maintenance needs. A lot of efforts were undertaken to find the most economical material that can treat P such as Electric Arc Furnace Slag (EAFS), a by-product from steel industry and Limestone (LS), and a natural resource that can be easily obtained from sedimentary rock. Despite numerous study conducted previously, the mechanism of P removal between these two materials have not been explored yet in detail. Therefore, an experimental work had been designed to evaluate the performance of P removal mechanism between the EAFS and LS lab-scale filter systems which can offer the best removal in overall. In this study a column lab scale of vertical rock filters in 100 mm diameter × 400 mm height were constructed for both EAFS and LS filters. The observation period was conducted for 2.5 months utilizing synthetic phosphorus concentration of 25 mg/L as its initial concentration. Working condition of the experiment was adjusted at pH 4.5 to 7.5 under 26.8±0.64 °C. X-ray fluorescence (XRF) analysis was also performed in order to determine chemical composition of EAFS and LS media. Results revealed that EAFS showed a significant effect on the removal of P mechanism compared to the LS filter system. The highest removal of P for both filter systems were observed to achieve 90% (pH 5) in the EAFS compared to only 68% (pH 4.5) in the LS system. This may be associated with the dissolution of Ca, Fe and Al elements in the EAFS that promotes precipitation process and hence gave higher removal compared to the LS element (only Ca has the highest percentage = 91%). At lower pH (acidic) condition the soluble metal salts react with phosphate ion to form phosphate hydrolysis product thus promoting precipitation in the system. In conclusion, it is predicted that precipitation may occur within the filter systems predominantly in the EAFS filter as pH was change from acidic to alkaline (4.5 – 7.5) due to dissolved (Al3+, Ca2+, Fe3+) within the filter system. Nevertheless, it is recommended that future study should be carried out on the precipitates salts through X-ray diffraction (XRD) analysis so as the existence of phosphate and metal salts as a result of precipitation can be finally confirmed.
Impact of Electrode Wire Feed Ways on Residual Stresses in Welded Joints
Authors: Kryukov Artem V. , Pavlov Nikolay
Published: April 2015

A series of experiments have been done to evaluate the way an electrode wire feed affects residual stresses in welded joints. It was found that an electrode wire pulse feed combined with shielding gases decreases residual stresses up to two times in comparison with welding with a continuous feed of an electrode wire.
The Simulation of the Electrolyte Temperature Effect on the Value Change of the Microhardness of Anodic Alumina Oxide Layers
Authors: Sobotova Lydia , Badida Miroslav , Kmec Jan , Gombar Miroslav , Kucerka Daniel
Published: April 2015

In order to improve the mechanical properties of the layer deposited by anodic oxidation of aluminum on the material EN AW-1050 H24, in the contribution was investigated the microhardness of the deposited layer as a function of the physic-chemical factors affecting in the process of anodic oxidation at the constant anodic current density J = 3 A.dm-2 in electrolyte formed by sulfuric acid and oxalic acid, with the emphasis on the influence of electrolyte temperature in the range – 1,78 °C to 45,78 °C. The model of the studied dependence was compiled based on mathematical and statistical analysis of matrix from experimental obtained data from composite rotation plan of experiment with five independent variable factors (amount of sulfuric acid in the electrolyte, the amount of oxalic acid in the electrolyte, electrolyte, anodizing time and applied voltage).
Effect of Particle Size of Recycled Polyamide 6 to Impact Toughness and Hardness
Authors: Senkerik Vojtech , Stanek Michal , Manas David , Manas Miroslav , Skrobak Adam , Navratil Jan
Published: April 2015

This work aims to investigate the effect of recycled material and effect of particle size on the mechanical properties of the recycled material. Tested material is polyamide 6. Every manufacture of any plastic parts produces certain amount of waste, such as defective injects or cold runner system from injection molding technology. When size of this material is reduced, particles of different sizes are made. From large particles similar to the original granulate material, to dust particles. This size variation can cause problems during subsequent processing. These particles of different size have distinct melting rate. To determine behavior of recycled material at room temperature. Impact toughness and hardness tests are performed.
Mechanical Properties of Injection Molded Rubber Testing Samples
Authors: Skrobak Adam , Stanek Michal , Manas David , Ovsik Martin , Senkerik Vojtech , Reznicek Martin
Published: April 2015

The aim of this article is to demonstrate and asses to what extent there is an impact on the mechanical properties of a standardized testing sample made of rubber compound based on synthetic rubber EPDM and produced by injection molding in comparison with a sample produced by classic preparation (cutting off a compression molded plate) according to the standard ISO 23529.
Micro-Hardness of PA6 Influenced by Beta Irradiation
Authors: Ovsik Martin , Manas David , Manas Miroslav , Stanek Michal , Reznicek Martin , Kratky Petr
Published: April 2015

In this paper, the effect of the electron beam irradiation on the indentation hardness, indentation modulus and indentation creep have been studied by means of the Depth sensing indentation (DSI). Cross-linking is a process in which polymer chains are associated through chemical bonds. Radiation doses of 33, 66 and 99 kGy were used for unfilled polyamide 6 with the 7% crosslinking agent (triallyl isocyanurate). Beta irradiation of the examined thermoplastic caused the growth of values of material parameters as micro-hardness, indentation modulus or indentation creep etc. From this point of view, there may be new application in areas with mechanical properties higher than their original properties. This study compared the mechanical properties of irradiated and non-irradiated PA6.
The Basic Mechanisms of Turbine Dummy-Blades Assembly and Dry-Friction Dampers Interaction Experimental Investigation
Authors: Nikhamkin M.Sh. , Sazhenkov N.A. , Semenova I.V. , Semenov S.V.
Published: April 2015

Experimental technique of turbine blades dry-friction dampers efficiency estimation is presented. Dummy turbine blades with underplattform friction dampers were used as a investigation objects. Experimental and numerical results of system modal characteristics changes and friction dampers parameters have been obtained for the range of centrifugal forces 0...149 N acting on the damper.
Thermo-Mechanical Properties and Tensile Behaviour of Modified LDPE by Radiation Cross-Linking after Temperature Load
Authors: Mizera Ales , Manas Miroslav , Manas David , Stanek Michal , Navratil Jan , Bednarik Martin
Published: April 2015

Radiation processing of polymers is a well-established and economical commercial method of precisely modifying the properties of polymers, especially thermo-mechanical properties. The thermo-mechanical properties and the tensile behaviour of modified LDPE samples by radiation cross-linking were measured at the ambient temperature and after temperature load. The tested samples showed significant changes of tensile behaviour before and after temperature load. From this point of view, new applications could also be seen in areas with service temperatures higher than their former melting point.
FE Analysis of the Effect of Material Gradient on the Performance of a Functionally Graded Endodontic Prefabricated Parallel Post
Authors: Helal Wasim M.K. , Shi Dong Yan , Wang Zhi Kai
Published: April 2015

A study of the effect of material gradient on the performance of a functionally graded endodontic prefabricated parallel post (FGEPPP) is the main goal of the current study. Elastic modulus (E) of FGEPPP is considered to vary continuously from lower to upper surfaces. This variation is performed according the volume fraction. Based on a modified sigmoid function, the volume fraction will be defined in the present work. The primary goal of the current investigation is to analyze the difference between the performance of a homogeneous endodontic prefabricated parallel post (EPPP) and a FGEPPP through finite element analysis (FEA). In the current investigation, von Mises stress, and shear stress in FGEPPP case with a modified sigmoid function and in homogeneous EPPP case are carried out. After that, the effect of material gradient on the performance of an EPPP made of FGM was carried out through FEA in the current investigation. The simulation cases shown that, the maximum values of von Mises stress, and shear stress increase when increasing the value of “D”, and decrease when increasing the value of “w”.
Test Research on Rubber Powder Asphalt Mixture under the Action of Temperature and Chlorine Salt
Authors: Ying Ming Gan , Zhong Dong Qing , Ma Ai Qun , Fan Yong Guang
Published: April 2015

This experiment analyzes the relation between rubber power asphalt mixture and Marshall Test results under the action of the temperature and salt corrosion, by using matrix asphalt mixture and 80 mesh 10% rubber power. It carries out 18 test, considering two factors of NaCl solution solubility and soak time. The test result indicated that immersed in the NaCl solution of the matrix asphalt mixture and the rubber power asphalt mixture stability is trending downward, with the increase of immersion time; Rubber power can improve the ability of asphalt mixture for resistance temperature and salinity. According to SEM micro-analysis, NaCl solution of salt corrosion can contribute to the further damage of asphalt mixture.
Keywords. Temperature; Chlorine Salt Corrosion; Rubber Powder; Asphalt Mixture
Comparison of Pavement Response Analysis between a 18-Axles Truck and Standard Thai Truck
Authors: Chaichannawatik Bhawat , Laosirihongthong Tawatchai , Boonyoo Tassana , Suparp Suniti
Published: April 2015

This article intends to present the pavement response analysis due to the 18-axles special truck used to transport a 400 tons generator parts. According to the DOH Declarations issued in 2005, DOH had issued the additional declarations containing special trucks or vehicles for overloaded transportation, proper axle and gross weights of each type of vehicles. However, the strain of the special truck must be less than the standard Thai truck (Truck25). The typical asphalt pavement is modeled and performed based on layered elastic analysis theory. The pavement is loaded with 18-axle truck. The maximum tensile strains under asphaltic concrete layer and compression strains on base, subbase, selected material and subgrade for special truck load are 234.4 ,618.1, 494.4, 422.9, and 772.3 με, respectively. However, the maximum compressive strains on selected material and subgrade of the special 18-axle truck was exceeded the standard Thai truck.
Investigation on Mechanical Properties of Natural Fiber Composite Using RTM Manufacturing Method
Authors: Park Hyun Bum
Published: April 2015

In this study, an investigation on mechanical properties of flax/vinyl ester natural fiber composite was performed. Vacuum Assisted Resin Transfer Molding (VARTM) manufacturing method was adopted for manufacturing the flax fiber composite specimen. The mechanical properties of the manufactured flax composites were compared with flax composite data cited from some references. Based on this, the experimental data showed that the flax/vinyl ester composite has some advantages when it is applied to environment-friendly structure.
A Parameter Study for the Test Condition of Kolsky Bar Experiment
Authors: Kim Yoon Sang , Young Sung
Published: April 2015

When the cross-sectional area of the specimen for the Kosky bar experiment (Split Hopkinson bar) is very small compared to the area of the input bar, most stress wave will be reflected and the signal detected by the strain gage attached on the output bar is very weak. The signal to noise ratio is very significant so that smoothing process is necessary to obtain meaningful results. To improve the design of the experiment, 2-dimensional finite element calculations are carried out for various specimen thickness and length and elastic stiffness of the bar. It is found that short specimen with large contact area and bar material with low stiffness give better results.
Microstructural and Mechanical Properties of Selective Laser Melted Al 4047
Authors: Siddique Shafaqat , Wycisk Eric , Frieling Gerrit , Emmelmann Claus , Walther Frank
Published: April 2015

Selective laser melting (SLM) has been recognized as a pertinent process for manufacturing of complex geometries. Al 4047 has been manufactured in this study with different processing parameters of the SLM process to obtain the optimal parameters suitable for required applications, as well as to determine the effect of these parameters and post-processing heat treatment on mechanical properties. A unique Al-Si eutectic microstructure is obtained with Al dendrites growing in the scanning direction. Mechanical properties of the SLM manufactured Al 4047 are at par with those of conventionally manufactured alloy. These properties can be varied by changing the SLM process parameters which can help controlling the process cost depending upon required mechanical properties.
Numerical Simulation for Predicting Fire Behavior of Axially Loaded Circular Concrete Filled Steel Tubular Columns
Authors: Rizalman Ahmad Nurfaidhi , Md Tahir Mahmood , Mohammad Shahrin , Sulaiman Arizu
Published: April 2015

The present study investigates the behavior of axial loaded circular concrete filled hollow steel section (CFHSS) columns. A nonlinear finite element model using ABAQUS program was developed to investigate the fire behavior of the inspected columns from previous fire tests. The study variables include column dimensions, steel section wall thickness, concrete strength, concrete types (plain or reinforced), and fire protection thickness. The comparison indicated that the results obtained from the model were within acceptable limit of accuracy of 15%. A sensitivity study was carried out to investigate the influence of the output of the numerical model including the Poisson’s ratio of concrete, thermal conductance at the steel-concrete interface, frictional contact at steel-concrete interface, and imperfection buckling of columns. Based on the sensitivity analysis, several modelling suggestions were given in this paper which will be beneficial for further study.
Behaviour of Composite Column of Cold-Formed Steel Section without Web Stiffener Integrated with Ferrocement Jacket
Authors: Saggaff Anis , Alenezi Khaled , Md Tahir Mahmood , Alhajri Talal , Ragae Mohamad
Published: April 2015

Cold-formed steel (CFS) is known to be a thin section. Thus it is considered a weak slender steel section which limits the compression capacity of the column. The aim of this study was to determine the ultimate capacity of built-up lipped CFS (assembled with ferrocement jacket) as composite column (CFFCC) under axial compression load. Nine specimens of composite columns were prepared and tested. The main parameters that varied in the CFFCC columns were column height, cold-formed steel thickness, and influence of ferrocement jacket. There were are three different heights of the CFFCC composite column namely 2000mm, 3000mm and 4000mm used in this study. All CFFCC columns were tested under axial load by a thick steel plate. The results indicated that ferrocement jacket provided sufficient lateral support to the column web and significantly increased both the strength and ductility of the specimens under axial loading. The strength capacity of CFFCC improved significantly, about 149% greater than that of bare steel column section. It was also found that the axial load capacity of CFS-ferrocement jacket composite columns (CFFCC) had increased significantly (in the range of 20% to 40%) as thickness of CFS increased.
Behaviour of Composite Column of Cold-Formed Steel Section with Web-Stiffener Integrated with Ferrocement Jacket
Authors: Alenezi Khaled , Md Tahir Mahmood , Alhajri Talal , Ragae Mohamad
Published: April 2015

Cold-formed steel (CFS) is known as slender or class 4 section due to high ratio of web-to-thickness ratio. The compressive strength of this type of section is usually very low as it tends to fail due to distortion and warping before reaching the actual compressive strength. The aim of this study is to determine the ultimate capacity of build-up lipped CFS assembled with ferrocement jacket where web-stiffener is provided as the proposed composite column (CFFCC) is under axial compression load. Nine specimens of composite columns were prepared and tested. The main parameters varied in the CFFCC columns are column height, cold-formed steel thickness and influence of ferrocement jacket and web-stiffener. There are three different heights of the CFFCC composite column namely 2000mm, 3000mm and 4000mm used in this study. All CFFCC columns were tested under axial load where a thick steel plate is used to evenly distribute the applied load. The results show the effect of providing both the ferrocement jacket to increase the confinement effect and the web stiffener to provide sufficient lateral support to the column web. A significant increase in both the strength and the ductility of the specimens under axial loading has been recorded. The strength capacity of CFFCC has been improved by about 178% greater than that of bare steel column. Also it is found that, axial load capacity of CFS-ferrocement jacket composite columns (CFFCC) were increased with the increase in thickness of CFS. The use of web-stiffener has improved the axial load capacity of the column but not that significant.
FRP-Concrete-Steel Double Skin Tubular Cantilever Beams: Behavior under Cyclic Loading
Authors: Idris Yunita , Ozbakkloglu Togay
Published: April 2015

This paper reports on an experimental study on the flexural behavior of fiber reinforced polymer (FRP)-concrete-steel double skin cantilever beams (referred to as DSTBs) that were tested under reversed cyclic loading. The beams were manufactured using a high-strength concrete (HSC) mix and they were 150 mm in diameter and 1.2 m in length. The main parameters of the experimental study included the size of the inner steel tube and the use of mechanical connectors in the form of steel rings welded on the inner steel tube. Test results indicate that DSTBs are capable of developing a highly ductile behavior under reversed cyclic lateral displacement excursions. It is found that the addition of mechanical connectors on the steel tube has no significant influence on the lateral displacement capacity of the test specimens, but they can eliminate the slippage between the concrete and inner steel tube. Examination of the test results has led to a number of significant conclusions on the influence of the beam parameters on the performance of DSTBs, which are discussed in the paper.
Investigation on the Use of Fly Ash and Residual Rice Husk Ash for Producing Unfired Building Bricks
Authors: Hwang Chao Lung , Huynh Trong Phuoc
Published: April 2015

This paper reports on the potential use of fly ash (FA) and residual rice husk ash (RHA) in producing unfired building bricks (UBB) with the application of densified mixture design algorithm (DMDA) method. In this study, little amount of cement (10–15%) was added into the mixtures as binder substitution. Whereas, unground rice husk ash (URHA), an agricultural by-product, was used as partial aggregate replacement (10–20%) in the mixtures. The UBB of 220×105×60 mm in size were prepared and the hardened properties of the bricks were tested including compressive strength, flexural strength, water absorption and bulk density according to Vietnamese standard. Forming pressure of 35 MPa was applied to form the solid bricks in the mold. The test results show that all brick specimens achieved very good mechanical properties. The compressive strength, flexural strength and water absorption of brick specimens were respectively in range of 16.1–22.1 MPa, 2.8–3.5 MPa and 9.5–14.8% and the other properties of the bricks were well conformed to related Vietnamese standard. It was definitely proved many potential applications of FA and RHA in the production of UBB.
Settlement Researches of Seismically Isolated Buildings
Authors: Andreev Vladimir I. , Mkrtychev O.V. , Dzhinchvelashvili Guram A. , Bunov A.A.
Published: April 2015

The paper studies the efficiency of seismic isolation system in the form of rubber-metal bearings with different height buildings at multicomponent seismic impact. As an example, seismically insulated monolithic reinforced concrete 5-, 9-and 16-storey buildings are considered. The solution of the problem is obtained by a direct integration of the motion equations for an explicit scheme in the software package LS-DYNA. The calculation is performed considering nonlinear nature of rubber bearings. The analysis of the effectiveness of buildings with seismic insulation and without it is performed.
Study on Wheel-Rail Coupled Vibration of Metro with Co-Simulation of Finite Element Analysis and Multi-Body Dynamics Simulation
Authors: Sun Wen Jing , Gong Dao , Zhou Jin Song
Published: April 2015

Based on the multi-body dynamics theory and modal-reduction analysis, finite element method and multi-body dynamics were combined to establish the flexible track model. The rigid-flexible coupled dynamics model can reflect the features of coupled vibration accurately. When the flexibility of the rail, damping and stiffness of support layers under the rail are taken into consideration, the whole track structure acted as a buffer while wheel and rail is interacting with each other. Compared with rigid track model, the wheel-rail vibration is less in the flexible track model. The proposed method in this paper is simple and effective, which makes the calculation of vehicle-track dynamic response more convenient and quick.
Effects of Solid Fractions in a Slurry Die Casting Process on Defects of 7075 Aluminum Alloy
Authors: Jumpol Waraporn , Wannasin Jessada , Janudom Somjai , Canyook Rungsinee , Plookphol Thawatchai , Wisutmethangoon Sirikul
Published: April 2015

The effects of Gas Induced Semi-Solid (GISS) in the slurry die casting process on defects of 7075 aluminum alloy were studied, different initial solid fractions with 10, 15, and 20 sec of rheocasting time were investigated. The results showed that the percentage of porosity in semi-solid die casting was smaller than in the liquid die casting. In terms of the initial solid fraction in 7075 aluminum alloy, it was found that the defects were found when the initial solid fraction was high. In addition.
Effect of Physicochemical Parameters on Methylene Blue Adsorption by Sulfuric Acid Treated Spent Grated Coconut
Authors: Khalid Khadijah , Hanafiah Megat Ahmad Kamal Megat , Wan Mat Khalir Wan Khaima Azira
Published: April 2015

The effect of physicochemical parameters on methylene blue (MB) adsorption by sulfuric acid treated spent grated coconut (SSGC) was investigated. The field emission scanning electron microscope (FESEM) images showed a change in surface morphology of spent grated coconut before and after acid treatment. Energy dispersive X-ray (EDX) spectrometer suggested the mechanism of ion-exchange occurred during MB adsorption onto SSGC. The pHpzc value of SSGC was 5.40. The amount of MB adsorbed remained constant after pH 3. The optimum dosage of SSGC was observed at 0.03 g, while the stirring rate did not significantly affect the amount of MB adsorbed. This work suggested electrostatic attraction and ion-exchange as the main mechanisms involved in MB adsorption.
Development of an Environmental Database for Construction Finish Materials Organized by Building Element
Authors: Kim Rak Hyun , Tae Sung Ho , Chae Chang U , Kim Ji Hoon
Published: April 2015

The purpose of this study was to develop an environmental database for construction finish materials organized by building element as part of an effort to develop an environmental effect assessment program for buildings. To this end, a classification system has been developed for building elements that satisfies the demands from construction project stakeholders to acquire environmental information. Furthermore, among the construction materials, an environmental database of the finish materials has been developed for each building element based on reference substances and the impact indexes of six environmental effect categories of the national LCI DB.
Optimization of Plate Heat Exchangers with Intermittent Ridges
Authors: Dvorak Vaclav
Published: April 2015

Research of devices for heat recovery is currently focused on increasing the temperature and heat efficiency of plate heat exchangers. The goal of optimization is not only to increase the heat transfer or even moisture but also reduce the pressure loss and possibly material costs. This study deals with a plate heat exchanger with wall shaped by intermittent ridges. We used software fluent and user defined deforming to deform computational mesh and create various heat exchange walls with different number of ridges and different number of set-offs. The intention of the set-offs is to discompose boundary layer inside channels created by ridges, mix the temperature field and thus intensify the heat transfer. We used previously formulated objective function, which is a linear combination of efficiency and pressure loss, and a simple local method to optimize the heat exchanger for required pressure loss. It was found that the objective function surface is monotone and unimodal, but is not smooth. The global optimums were identified and it was shown that the optimal wall shape has no set-off for low pressure losses. The optimal count of ridges and optimal count of set-offs rise with higher required pressure loss. It was proved that the suggested objective function is suitable for optimization of a counterflow plate heat exchanger, but use of a global optimization method would be beneficial.
Technological and Operational Aspects of Integrated Bladed Rotors Manufacture
Authors: Kutin Andrei , Grigoriev Sergei , Turkin Mikhail , Sedykh Mikhail
Published: April 2015

This paper examines technological and operational aspects that influence the selection of manufacturing process structure for integrated bladed rotors. On one hand the choice of rough manufacturing process technologies is highly important as it determines the main portion of the cycle time and as a result greatly affects the overall unit cost. On the other hand the finishing processes greatly influences the operational parameters of the blisk in service as the final geometry, surface roughness and boundary layer properties are formed at this stage. This research provides ways to build a solid framework for selecting optimal technologies and tools at each stage of blisk manufacturing based on a set of key parameters that include geometric requirements specified by the drawings, properties of the stock material, production volume and operational requirements.
Technology for Hydrothermal Destruction of Organic Fuel Materials
Authors: Mazalov Yuriy , Pustovgar Andrey , Grigorev Viktor , Vedenin Aleksandr , Adamtsevich Aleksey
Published: April 2015

The article presents the results of research of the hydrothermal destruction technology of organic fuel materials for the production of steam-flue gas mixture for thermal engines.
Technological Limitations of Selective Laser Melting Method
Authors: Tarasova T.V. , Nazarov Alexey
Published: April 2015

The method of selective laser melting (further SLM) has big prospects from the point of view of achievement of a difficult form of details with high precision and quality of a surface, however SLM has also a number of technological restrictions from the point of view of achievement of a difficult form of details. In this work technological capabilities of production of figurine details from a heat resisting cobalt alloy are investigated by method of selective laser melting, technological restrictions of a method and way of their overcoming are shown.
The Extension of Battery Lives Used in a Solar Irrigation System with Regards to Charge-Discharge Numbers
Authors: Kazan Fatih Alpaslan , Sungur Cemil , Terzioğlu Hakan
Published: April 2015

In the present study, an irrigation system with an adaptive control system and powered by solar photovoltaic panels was designed and implemented. The control circuit, which was produced by using dsPIC, performed the online processing of the data received from current-voltage sensors and liquid level measurements. Different from the other studies in the literature, in this study, the source from which the irrigation system is fed was determined based on the power produced by the panel. If the power produced by the panel was lower than the determined power value, the system was fed from the battery, if higher, directly from the panel. With this developed algorithm, it was aimed to keep the tank full and to extend the expected life of the battery in terms of the number of charges-discharges through preventing the unnecessary discharge of the battery at times when water was needed. As the result of this study, the system was operated at an optimum level without requiring any energy other than the photovoltaic panel.
Enhancement the Maneuverability of Tele-Hydraulic System Using Fuzzy Friction Compensator
Authors: Po-Ngaen Watcharin , Maka J.
Published: April 2015

One degree of freedom (DOF) tele-hydraulic manipulation using force reflecting bilateral control will be investigated. The primary objective in the development of a simple one DOF experimental rig was to allow the investigation of different tele-control strategies prior to their implementation on the eight DOF tele-hydraulic excavator system. Because of the friction nonlinearity characteristic in hydraulic system, high steady state error and overshoot have occurred in the position response as a typical imperfect implementation of associated control dynamic. In this situation, there is a necessity to be able to effectively utilizing the intelligent friction compensated controller. This fuzzy compensator combined with fuzzy controller will be implemented to enhance the maneuverability performance. Experiments were carried out and the experimental results illustrated that the above compensated intelligent framework can improve the bilateral performance
Cellulosic Materials Characterisation of Kenaf Core from Retting Process Using Thermal Analysis
Authors: Nor Munirah A. , Ramlah M.T. , Sharifah A.
Published: April 2015

The waste from the kenaf water retting; kenaf core can be used to create by-product. The characteristics of the kenaf are important to create new by-product. Cellulosic materials can be obtained from fibrous plants which known as cellulose, hemicelluloses, lignin, waxes, and several water-soluble compounds. Kenaf was categorized as one of the fibrous family plants. Hence, its cellulosic materials need to be determined before extraction process. This research was conducted to determine the cellulosic materials concentration in kenaf core using Thermal Gravimetry Analyzer (TGA) and Differential Scanning Calorimetry (DSC). As result, the percentage of degradation and decomposition of cellulosic materials were recorded and analyzed as reported in this paper.
Growth Kinetic Study on Lyophilized and Cryopreserved Pleurotus sajor-caju Spawn
Authors: Mohd Shayuti Sharul Aida , Chong Shi Fern , Zakaria Zarina , Arbain Dachyar , Yaacob Noorulnajwa Diyana
Published: April 2015

A study was conducted to determine the most optimal preservation technique for P. sajor-caju spawns which produce maximum specific growth rate and shortest doubling time by using contois kinetic model. The analyzed experimental data showed that lyophilized P. sajor-caju spawn showed the highest maximum specific growth rate, and shortest doubling time compared to cryopreserved P. sajor-caju spawn and 4oC stored P. spawn. There was no significant difference in aspect of growth rate between the lyophilization and cryopreservation techniques which were; 0.148 (μmax)/ (g/day) and 0.147(μmax)/ (g/day) respectively. Based on the result, lyophilization technique was considered as the best preservation technique for preserving P. sajor-caju spawn due to high maximum growth rate which indicates high survival after exposure to preservation treatment.
Nanoemulsion Formulation Using Biodegradable Oil in Enhance Oil Recovery (EOR)
Authors: Effah Yahya , Nur Hashimah Alias , Nurul Aimi Ghazali , Tengku Amran Tengku Mohd , Hafizzuddin Othman
Published: April 2015

Nanoemuslion is type of dispersion of emulsion in nanoscale from the effect that forms by shear that inducing rupturing. This small particle size of distribution conduit a higher efficiency in the sweeping trapped oil and lowering the IFT as the small size of nanoparticle provided a larger surface area contact to the reservoir. Thus, nanoemulsion is one of the new implemented techniques of the nanotechnology formulation of chemical flooding in the oil and gas industry. This paper presented the formulation of nanoemulsion using biodegradable oil as the nanoemulsion is the oil in water emulsion. Biodegradable oil is proven able to introduce a several advantages in the industry as it is renewable, environmental friendly, and produced easily in rural areas. In this research, nanoemulsion was formulated using three chosen biodegradable oil which is a corn oil, olive oil and sunflower oil that had been emulsified in the non ionic surfactant (Tween 80) and distilled water. The nanoemulsion that had been formulated was being analyzed based on particle size of distribution. Water flooding oil recovery using the lowest salinity of brine had recovered at average of 50% of IOIP. In the nanoemulsion flooding in enhance oil recover; corn oil has the recovered the highest percentage of IOIP which is 34.38% followed with olive oil 32.79% and sunflower oil 30.23%. Corn oil nanoemulsion is the most optimum biodegradable oil to be act to be act as displacing fluid in EOR chemical flooding in this case of research paper.
Extraction of Oil from Jatropha curcas L. Seed and Kernel at Supercritical Hexane via High-Temperature High-Pressure Batch Wise Reactor System
Authors: Ishak Mohd Azlan Mohd , Hussain H.H. , Ismail K. , Nawawi Wan Izhan , Zaidi Ab Ghani , Ani A.Y.
Published: April 2015

Extraction of oil from Jatropha curcas L. seed and kernel using hexane as solvent was performed at supercritical state of hexane; temperature from 200-280 °C, pressure from 4-12 MPa, with fixed 30 min extraction time, sample ratio to solvent 1:40 (w/v), and 300 rpm in a 1-liter high-temperature high-pressure batch wise reactor system. The percentages of oil yield from seed and kernel obtained via supercritical hexane were 67.2 and 81.2 %, respectively. The percentages of oil yield increase with increasing in pressure and temperature. The percentages of oil yield via supercritical hexane extraction were much better compared to soxhlet extraction (i.e. seed, 37 % and kernel, 48 %) and mechanical pressing techniques (i.e. seed, 30 % and kernel, 25 %). Oils extracted were derivatized into FAMEs before quantified using GC-MS. The results showed that maximum oil yield was obtained at temperature 280 °C, pressure 12 MPa, whereby oleic acid is the most abundance (43.4 %) followed by linoleic acid (29 %), palmitic acid (20.1 %) and stearic acid (7.5 %). Comparison extraction with soxhlet and mechanical pressing showed that the percentages of FAMEs distributions are similar in all extracts and they agree with the previous data obtained by other researchers.
pH Measurement Using Titanium Dioxide Nanoparticles Thin Film Based Sensors
Authors: Puah A.Y.P. , Nadzirah Sharipah , Md Arshad Mohd Khairuddin , Ramzan Mat Ayub , Rahim Ruslinda A. , Hashim Uda
Published: April 2015

Optimization gap size and integration of TiO2 nanoparticles thin film produce a sensitive sensor device. Sol-gel spin coated TiO2 nanoparticles thin film is coated on a conventional fabricated IDEs with gap sizes of 7 μm, 10 μm, 14 μm and 17 μm which is then validated through electrical characterization. I-V characteristics of without and with TiO2 thin film of various gap sizes are subjected to pH test are then plotted to describe the resistance of the devices and correlate with the sensitivity measurement. Sensing devices show that devices with larger spacing and greater pH values have higher current. On the other hand, integration of TiO2 thin film reduced the resistance of devices. Among the four gap sizes, 7 μm gap sized device is the most sensitive one due to the tremendous difference after small amount of pH dropped on surface, thus lowering the detection limit.
Tuning Graphene Surface Resistance for a 52 GHz Nano-Antenna
Authors: Ezanuddin A.A.M. , Ismail A.H.
Published: April 2015

The commercial potential of the 60 GHz band, in combination with the scaling growth of graphene nanotechnology, has resulted in a lot of digital graphene circuits for millimeter-wave application. This work presents a 0.345 nm monolayer graphene film on substrates SiO2/Teflon/Copper as a new nanoantenna. The nanoantenna achieves 2.003 of maximum gain (Abs) with particularly the graphene sheet resistance and reactance as the key variables. The presented nanoantenna targets 52 GHz communication where beamforming is required.
Functionalization of Multi Wall Carbon Nanotubes Using Nitric Acid Oxidation
Authors: Ba Hashwan Saeed S. , Fatin M.F. , Ruslinda A. Rahim , Md Arshad M.K. , Hashim Uda , Ramzan Mat Ayub
Published: April 2015

Functionalized of Multi Wall Carbon Nanotubes (MWCNTs) were demonstrated using the nitric acid (HNO3) oxidation technique in order to get opened caps, removing carbonaceous and metal particles impurities for carboxylic groups (-COOH). The surface morphology and the existence of the carboxyl-group on the MWCNTs were examined using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM), respectively. The carboxylic groups were observed at the peak of 1640.40cm-1 via FTIR and indicate the absorbance intensity of the functionalized MWCNTs is 2.22 A which is higher than raw material. Furthermore, SEM image shows the bundle of structure on the raw MWCNTs signified the Van der Waals interaction between MWCNTs while after functionalized a groovy CNTs wall were observed due to presence of carboxyl group at the defect sites.
Effects of Indium (In) to the Efficiency Tandem Cell Ga1-xInxP/Silicon for Solar Cell Application
Authors: Zahari Suhaila Mohd , Osman Rozana Aina Maulat , Norizan Mohd Natashah , Mohamad Ili Salwani , Malini Azura , Taking Sanna
Published: April 2015

In this paper, the contribution of Indium (In) to the Gallium Phosphide (GaP) composition of solar cell was investigated to know the effectiveness of the In when its being substitute to GaP layer on the top layer of Silicon (Si) substrate. The substitution was made to the Ga1-xInxP for the range of (0≤x≤0.5). The highest efficiency was 10.1235% for x=0.5 for the Ga1-xInxP. In contribution shows a higher efficiency compared to single layer GaP which only about 5.40608%. As the x composition increased, the efficiency becomes higher for each composition increment. The rate of efficiency, increased about 88% and improves current density with a value up to 13.1134mA/cm2.The efficiency obtained in this work is considerably high using simulation tools compared to the previous record for InGaP/Silicon reported in Feb 2014 about 6~11.2% by fabrication method.