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    - ENGINEERING (1180 journals)
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ENGINEERING (1180 journals)            First | 1 2 3 4 5 6 7 8 | Last

Designed Monomers and Polymers     Hybrid Journal   (Followers: 2)
Designs, Codes and Cryptography     Hybrid Journal   (Followers: 9)
Developments in Clay Science     Full-text available via subscription  
Developments in Geotechnical Engineering     Full-text available via subscription   (Followers: 3)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 1)
Diálogos Interdisciplinares     Open Access  
Diamond Light Source Proceedings     Full-text available via subscription  
Digital Signal Processing     Hybrid Journal   (Followers: 12)
Discrete Optimization     Full-text available via subscription   (Followers: 5)
Doct-Us Journal     Open Access  
Documents pour l'histoire des techniques     Open Access   (Followers: 1)
Dyes and Pigments     Hybrid Journal   (Followers: 3)
Dyna     Open Access  
Dynamical Systems : An International Journal     Hybrid Journal   (Followers: 1)
E&S Engineering and Science     Open Access  
El Hombre y la Máquina     Open Access  
Electromagnetics     Hybrid Journal   (Followers: 2)
Electrophoresis     Hybrid Journal   (Followers: 5)
Elsevier Geo-Engineering Book Series     Full-text available via subscription   (Followers: 3)
Elsevier Ocean Engineering Series     Full-text available via subscription   (Followers: 1)
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 23)
Energies     Open Access   (Followers: 3)
Energy and Power Engineering     Open Access   (Followers: 11)
Energy Conversion and Management     Hybrid Journal   (Followers: 11)
Energy Engineering     Full-text available via subscription   (Followers: 10)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Energy Procedia     Open Access   (Followers: 4)
Energy Science & Engineering     Open Access   (Followers: 5)
Energy Science and Technology     Open Access   (Followers: 13)
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects     Hybrid Journal   (Followers: 3)
Energy Sources, Part B: Economics, Planning, and Policy     Hybrid Journal   (Followers: 7)
Energy Systems     Hybrid Journal   (Followers: 12)
ENGEVISTA     Open Access   (Followers: 1)
ENGI : Revista Electrónica de la Facultad de Ingenieria     Open Access  
Engineer : Journal of the Institution of Engineers, Sri Lanka     Open Access  
Engineering     Open Access   (Followers: 2)
Engineering     Open Access   (Followers: 1)
Engineering & Technology     Hybrid Journal   (Followers: 19)
Engineering Analysis with Boundary Elements     Hybrid Journal   (Followers: 1)
Engineering Computations     Hybrid Journal   (Followers: 4)
Engineering Economics     Open Access   (Followers: 4)
Engineering Economist, The     Hybrid Journal   (Followers: 3)
Engineering Education     Open Access   (Followers: 1)
Engineering Failure Analysis     Hybrid Journal   (Followers: 43)
Engineering Geology     Hybrid Journal   (Followers: 8)
Engineering International     Open Access  
Engineering Journal     Open Access   (Followers: 1)
Engineering Management Journal     Hybrid Journal   (Followers: 14)
Engineering Management Research     Open Access   (Followers: 5)
Engineering Management Reviews     Open Access   (Followers: 1)
Engineering Optimization     Hybrid Journal   (Followers: 8)
Engineering Science and Technology, an International Journal     Open Access  
Engineering Sciences     Open Access  
Engineering Studies     Hybrid Journal  
Engineering With Computers     Hybrid Journal   (Followers: 5)
Engineering, Technology & Applied Science Research     Open Access   (Followers: 1)
Entramado     Open Access  
Entropy     Open Access   (Followers: 3)
Environmental & Engineering Geoscience     Full-text available via subscription   (Followers: 2)
Environmental and Ecological Statistics     Hybrid Journal   (Followers: 6)
Environmetrics     Hybrid Journal  
Épités - Épitészettudomány     Full-text available via subscription   (Followers: 1)
EPJ Photovoltaics     Open Access   (Followers: 2)
Épsilon     Open Access  
Ergonomics in Design: The Quarterly of Human Factors Applications     Hybrid Journal   (Followers: 11)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription  
ESAIM: Mathematical Modelling and Numerical Analysis     Full-text available via subscription   (Followers: 2)
ESAIM: Proceedings     Open Access  
Estuaries and Coasts     Hybrid Journal   (Followers: 7)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 3)
European Journal of Engineering Education     Hybrid Journal   (Followers: 3)
European Journal of Lipid Science and Technology     Hybrid Journal   (Followers: 1)
European Journal of Mass Spectrometry     Full-text available via subscription   (Followers: 11)
European Medical Device Technology     Full-text available via subscription   (Followers: 4)
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 5)
European Transport Research Review     Open Access   (Followers: 24)
Evolutionary Intelligence     Hybrid Journal  
Evolving Systems     Hybrid Journal   (Followers: 1)
Exacta     Open Access  
Experimental Techniques     Hybrid Journal   (Followers: 47)
Experiments in Fluids     Hybrid Journal   (Followers: 9)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
Filtration & Separation     Full-text available via subscription   (Followers: 5)
Finite Fields and Their Applications     Full-text available via subscription   (Followers: 3)
Fire Science Reviews     Open Access   (Followers: 6)
First Monday     Open Access   (Followers: 116)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Flow, Turbulence and Combustion     Hybrid Journal   (Followers: 20)
Fluid Dynamics     Hybrid Journal   (Followers: 6)
Fluid Dynamics Research     Full-text available via subscription   (Followers: 8)
Fluid Phase Equilibria     Hybrid Journal   (Followers: 4)
Focus on Catalysts     Full-text available via subscription   (Followers: 1)
Focus on Pigments     Full-text available via subscription   (Followers: 3)
Focus on Powder Coatings     Full-text available via subscription   (Followers: 3)
Focus on Surfactants     Full-text available via subscription   (Followers: 4)
Food Engineering Reviews     Hybrid Journal   (Followers: 3)
Food Science and Technology     Open Access   (Followers: 3)
Formación Universitaria     Open Access   (Followers: 4)
FORMakademisk     Open Access  
Formal Methods in System Design     Hybrid Journal   (Followers: 6)

  First | 1 2 3 4 5 6 7 8 | Last

Journal Cover   Engineering Journal
  [SJR: 0.269]   [H-I: 16]   [1 followers]  Follow
  This is an Open Access Journal Open Access journal
   ISSN (Print) 0125-8281 - ISSN (Online) 0125-8281
   Published by Chulalongkorn University Homepage  [1 journal]
  • Diagnosis through Series Connected Photovoltaic Panels by Pulse Power Line
           Communication Technique

    • Authors: Pairote Sirinamaratana, Ekachai Leelarasmee
      Abstract: Automatic diagnosis through individual PV panel is especially required for hard to reach locations such as solar rooftop or exterior building. Therefore, a novel solution for diagnosing photovoltaic (PV) panels through their PV string is proposed. Our solution not only measures IV curve of PV panels, but it can also determine disconnected or loose location of power cable. Large pulse communication technique is used to implement this solution to achieve low cost and zero power shut down. Comparison with other existing solutions is also discussed. The proposed technique is implemented on a five-panel PV string. Its satisfactorily testing results are presented under strong and weak sunlight conditions. For further understanding in PV panel, an amorphous silicon PV panel is characterized and also modeled to be a simple equivalent circuit.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Selected RSSI-based DV-Hop Localization for Wireless Sensor Networks

    • Authors: Mongkol Wongkhan, Soamsiri Chantaraskul
      Abstract: With the increasing demand on wireless sensor networks (WSNs) applications, acquiring the information of sensor node locations becomes one of the most important issues. Up to now, available localization approaches can be categorized into range-free and range-based methods. Range-free localizations are being pursued as a more cost-effective method. However, range-based schemes have better localization accuracy. This paper proposes the selected RSSI-based DV-Hop localization, which improves localization accuracy from the existing schemes by applying a combined technique that inherits the benefits from both methods. Our proposed technique firstly employs the DV-Hop approach of range-free algorithms, then uses the received signal strength indicator (RSSI) estimation technique of range-based algorithms to estimate the distances of selected hops. This paper also includes basic studies, which have been performed via computer simulations as well as testbed experiments, for distance calculation from RSSI measurement and location estimation in order to prove the credibility of our simulator. The proposed technique is implemented and tested via our developed WSN simulation model. Results in terms of distance error in comparison with traditional DV-Hop, RDV-Hop, and weighted RSSI algorithms show significant performance improvement by using our proposed method for both low-density and high-density wireless sensor network test scenarios.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • A Comparative Analysis of Three Optimisation Approaches to Free Swell
           Characterisation of Particulate Coconut Shell Reinforcement Composite

    • Authors: Oluwaseyi Ayodele Ajibade, Johnson Olumuyiwa Agunsoye, Sunday Ayoola Oke
      Abstract: There is paucity of data relating to the free swell properties of composite reinforcement materials in outdoor applications despite their undesirable tendency to absorb water. In this paper, a comparative performance analysis of three optimisation models - Taguchi method, simplex algorithm and Taguchi-simplex method - is pursued. We used experimental data of 0.600 mm particulate coconut shell with L27 (311) orthogonal arrays of the Taguchi method. For the Taguchi-simplex method, S/N ratios were used as the objective function that the simplex algorithm optimised. Parameters include initial and final volumes of coconut shell particulates (CSPs), mass of water, volumes of CSP and water as well as mass of CSP. The optimised Taguchi method yielded initial and final volumes of 10 and 34 cm3, respectively while it gave the optimal mass of water as 141.54 g. Also, 152 cm 3 was the optimal volume of CSP and water while the mass of CSP was optimised to 12.07 g with the use of Taguchi method. However, the use of simplex method retained the initial values of 20 cm3, 34 cm3, 146.81 g, 153 cm3 and 12.07 g as optimal values for the initial and final volumes, mass of water, volume of CSP and water as well as mass of CSP, respectively. The use of Taguchi-simplex method yielded optimal initial and final volumes of 16.6 and 24.82 cm3, respectively. Also, the mass of water was optimal at 92.49 g while the volume of CSP and water was optimal at 107.1 cm3. Lastly, the optimal value for the mass of CSP was obtained at 6.28 g. Confirmatory test validated the results. In conclusion, the optimum parametric setting of the Taguchi-simplex method was the best.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • A Dual-Band Rectifier for RF Energy Harvesting

    • Authors: Ekkaphol Khansalee, Kittipong Nuanyai, Yan Zhao
      Abstract: Our cities are surrounded by a large number of radio frequency (RF) signals broadcasted by various wireless systems. In order to enhance the efficiency of energy usage in addition to the purpose of communication, ambient RF energy harvesting systems are designed to harvest and recycle wireless energy for many applications such as battery chargers, sensor devices and portable devices. The main element of the ambient RF energy harvesting system is a rectenna which is the combination of an antenna and a rectifying circuit. Even though the ambient RF energy is widely broadcasted by many systems, the energy is extremely low. Therefore, high performance antenna and rectifying circuits have to be designed for supporting small incident power; also the number of frequency channels of the rectenna can enhance the performance and support different harvesting locations. This paper proposes a dual-band rectifier for RF energy harvesting which is designed to operate at 2.1 GHz and 2.45 GHz. The first channel can provide the maximum efficiency of 24% with 1.9 V of the output voltage at 10 dBm of input power. On the other hand, a maximum efficiency of 18% and 1.7 V of the output voltage can be achieved by the second channel at 10 dBm of input power.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Behaviour of Grain Separation in Thai Transverse Axial Threshing Units for
           Chainat 1 Rice Variety

    • Authors: Somchai Chuan-Udom
      Abstract: A transverse axial threshing unit is widely used in self-propelled combine harvesters in Thailand and the ASEAN region. The grain separating behaviour of this threshing unit affects the performance of the threshing unit and cleaning unit. This study aims to find out the behaviour of grain separation in a Thai transverse axial flow threshing unit. The concave rod clearance was chosen as the test medium, as this significantly affects the behaviour of grain separation and Chainat 1 rice variety was chosen for test. The results show that 70-80% of grain were separated from the straw, and then fell through the lower concave of the feeding zone into the cleaning unit; whilst the rest were threshed in the separation zone. The purity of grain input into the cleaning unit was quite steady in the feeding zone, although the grain purity in the separation zone decreased as the length of the separation zone increased. The cumulative straws increased linearly during the feeding zone, as they increased exponentially in the separation zone. In contrast, the cumulative undeveloped kernels and other contaminants increased linearly when the length of the separation zone also increased.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Effective Partitioning and Multiple RDF Indexing for Database Triple Store

    • Authors: Sunitha Abburu, Suresh Babu Golla
      Abstract: The capability of semantic technology leads to adaption of semantic technology to multiple applications of various domains. Due to vast number of applications, the size of RDF triple store is increasing. Effective semantic query execution has become a challenge due to the structure of RDF triple store. Effective indexing and partitioning leads to good sematic query performance against RDF triple store. The current research work has focused on various indexing techniques and proposed a predicate centric partitioning and multiple RDF indexing method for database triple store. A detailed analysis process is been executed to measure and compare the query performance. The current method is evaluated using standard benchmark and real datasets with various indexing techniques. Later the methodology is applied to R&D project management dataset. A set of twenty seven queries has been derived by considering various user requirements that cover most of the SPARQL constructs. The method is implemented and a detailed evaluation has been successfully carried out. The query time is evaluated on R&D project management dataset. The test results indicate that the proposed method provides considerable improvement in overall query performance.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • On Computing the Worst-case H∞ Performance of Lur'e Systems
           with Uncertain Time-invariant Delays

    • Authors: Thapana Nampradit, David Banjerdpongchai
      Abstract: This paper presents a worst-case H∞ performance analysis for Lur'e systems with time-invariant delays. The sucient condition to guarantee an upper bound of worst-case performance is developed based on the delay-partitioning Lyapunov-Krasovskii functional containing the integral of sector-bounded nonlinearities. Using Jensen inequality and S-procedure, the delay-dependent criterion is given in terms of linear matrix inequalities. In addition, we extend the criterion to compute the worst-case performance for Lur'e systems subject to norm-bounded uncertainties by using a matrix eliminating lemma. Numerical results show that our criterion provide the least upper bound on the worst-case H∞ performance comparing to the criteria derived based on existing techniques.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Machining Performance Analysis in End Milling: Predicting Using ANN and a
           Comparative Optimisation Study of ANN/BB-BC and ANN/PSO

    • Authors: Desmond Eseoghene Ighravwe, Sunday Ayoola Oke
      Abstract: End milling machining performance indicators such as surface roughness, tool wear and machining time are the principally indicators of machine tool industrial productivity, cost and competitiveness. Since accurate predictions and optimisations are necessary for control purposes, new merit-driven approaches are for good results. The aim of this work is two folds: prediction of machining performance for surface roughness, tool wear and machining time with ANN and the optimisation of these performance indicators using the combined models of ANN-BB-BC and ANN-PSO. However, the optimisation platform is hinged on the fuzzy goal programming model, which facilitates comparisons between the performance of the BB-BC and the PSO algorithms. To demonstrate the approach, optimal tool wear and surface roughness were obtained from a fuzzy goal programme, then converted to a bi-objective non-linear programming model, and solved with the BB-BC and the PSO algorithms. The outputs of the artificial neural network (ANN) were integrated with the optimisation models. The effectiveness of the method was ascertained using extensive literature data. Thus, prediction and optimisation of complex end milling parameters was attained using appropriate selection of parameters with high quality outputs, enhanced by precise prediction and optimisation tools in this proposed approach.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Effects of Design Parameters on the Fluid Flow and the Efficiency of
           Single Ended Evacuated Tubular Solar Thermal Collectors via FEM Modelling
           and Experimentation

    • Authors: Junkun Ma, Cris Koutsougeras
      Abstract: This work is about assessment of the single-ended evacuated tubular solar thermal collectors which are widely used in solar heating applications. Exchange and transfer of heat are accomplished by a thermosyphon process. The flow pattern of the working fluid within the collector is determined by a combination of gravity forces and the fluid's buoyancy forces which are due to varying density at varying temperature. This paper reports on a finite element method (FEM) based numerical study of the dependence of the working fluid flow pattern on the collector’s design parameters such as inclination angles and collector length-to-diameter ratio. This fluid flow pattern determines the heat exchange between the working fluid and the selective coating and thus the efficiency of the collector. A model of this process has been implemented in a simulator built via COMSOL FEM software package. A physical solar water heating system made with five commercial evacuated tubular collectors was also built and tested to verify the simulation results. Public access to the simulator is provided here.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • An Automatic Real-time Synchronization of Live speech with Its
           Transcription Approach

    • Authors: Nat Lertwongkhanakool, Natthawut Kertkeidkachorn, Proadpran Punyabukkana, Atiwong Suchato
      Abstract: Most studies in automatic synchronization of speech and transcription focus on the synchronization at the sentence level or the phrase level. Nevertheless, in some languages, like Thai, boundaries of such levels are difficult to linguistically define, especially in case of the synchronization of speech and its transcription. Consequently, the synchronization at a finer level like the syllabic level is promising. In this article, an approach to synchronize live speech with its corresponding transcription in real time at the syllabic level is proposed. Our approach employs the modified real-time syllable detection procedure from our previous work and the transcription verification procedure then adopts to verify correctness and to recover errors caused by the real-time syllable detection procedure. In experiments, the acoustic features and the parameters are customized empirically. Results are compared with two baselines which have been applied to the Thai scenario. Experimental results indicate that, our approach outperforms two baselines with error rate reduction of 75.9% and 41.9% respectively and also can provide results in the real-time situation. Besides, our approach is applied to the practical application, namely ChulaDAISY. Practical experiments show that ChulaDAISY applied with our approach could reduce time consumption for producing audio books.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Ni Dispersed on Sulfated Zirconia Pillared Montmorillonite as Bifunctional
           Catalyst in Eco-Friendly Citronellal Conversion

    • Authors: Is Fatimah, Dwiarso Rubiyanto, Thorikul Huda, Sri Handayani, Oryza Mutiara Ilahi, Septian Perwira Yudha
      Abstract: Nickel dispersed on sulfated zirconia pillared montmorillonite was prepared by three main steps; zirconia pillarization, sulfation and nickel dispersion. The synthesized material was characterized with FTIR spectroscopy, elemental analysis, x-ray diffraction and gas sorption analyzer before was tested for microwave assisted citronellal conversion via catalytic hydrogen transfer mechanism. The results showed that the obtained material gave high total conversion and demonstrated cyclization, isomerization and hydrogenation mechanism in one pot reaction. The presence of sulfate and nickel in the catalyst play important role within the mechanism.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Ethylene/1-Hexene Copolymerization over Different Phases Titania-Supported
           Zirconocene Catalysts

    • Authors: Mingkwan Wannaborworn, Thanai Sriphaisal, Piyasan Praserthdam, Bunjerd Jongsomjit
      Abstract: Ethylene/1-hexene copolymerization was performed over titania-supported zirconocene/dMMAO catalysts. Effects of titania having different phases on the catalytic activity and polymer properties were investigated. It was found that anatase titania exhibited the highest catalytic activity, and afforded copolymer with high 1-hexene incorporation among other titanias. According to TGA result, the stronger interaction between dMMAO and titania for anatase phase led to the highest catalytic activity, because the stronger interaction between cocatalyst and support would prevent the leaching of cocatalyst. Additionally, based on EDX mapping, a good dispersion of dMMAO over support surface is another reason for an increase in the catalytic activity. SEM analysis indicated that no significant change in polymer morphology was found for all supported catalysts. The incorporation of 1-hexene determined by 13C NMR suggested that titania which possessed high amount of [Al]dMMAO over support surface showed high ability to incorporate 1-hexene. The random copolymers were produced in all systems.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Transmission Line Based Wideband Microwave Sensor for Determination of
           Biodiesel Purification

    • Authors: Nutdechatorn Puangngernmak, Kanokwan Sroykesorn, Tawiwan Kangsadan, Suramate Chalermwisutkul
      Abstract: The main objective of this study is the application of the microwave measurement technique to determine electrical characteristics of material with complex permittivity values in a frequency range from 100MHz-10GHz. The measurement results represent the purification level of biodiesel compared to the results analyzed by Gas Chromatography (GC) technique (modified EN14103). The microwave sensor was created based on a simple strip line structure of a microwave transmission line which is filled with the liquid under test (LUT) samples. Scattering parameters have been measured using a vector network analyzer (VNA). After that, the complex permittivity values and impulse response using inverse Fourier transformation of the propagation coefficient have been calculated and compared with the results from GC analysis. The results of complex permittivity can be used to describe the behavior of LUT in terms of relative permittivity related to the stored energy and the dissipation of energy within the sample. The levels of purification of biodiesel are represented by the relative complex permittivity of the LUT. Another way to identify the level of purification uses the complex value of inverse Fourier transformation of the propagation coefficient. By doing this, the stored energy and the dissipation of the LUT can also be analyzed in time domain. Four biodiesel samples have been analyzed using the proposed sensor. The purification level can be obviously identified especially in a frequency range from 2 to 4 GHz.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
  • Application of Subcritical Water Hydrolysate from Thermosetting Polyester
           Resin to Aqueous Agents

    • Authors: Takaharu Nakagawa, Motonobu Goto
      Abstract: Thermosetting polyester resin used in fiber reinforced plastic (FRP) is very difficult to be recycled since it cannot be re-molded like thermoplastic resin. In recycling thermosetting polyester resin, subcritical water with alkali was applied to hydrolyze ester bonds to obtain styrene-fumaric acid copolymer (SFC). SFC, subcritical water hydrolysate from thermosetting polyester resin, has a molecular structure of functional polymer. Alkali salt of the SFC has a same molecular structure as alkali salt of styrene-maleic anhydride copolymer (SMA) which is widely used in various kinds of high performance additives for aqueous applications. In these applications, dispersing agent, detergent builder, and surface sizing agent were selected for application of alkali salt of the SFC . The reaction product liquid contains sodium salt of SFC (SFC-Na). It was evaluated as dispersing agent and detergent builder. Ammonium salt of SFC (SFC-NH4) was evaluated as surface sizing agent for paper. The evaluation results were compared with that of commercial additives to verify the possibility to substitute them. The reaction product liquid showed superior dispersing effect to commercial dispersing agent for hydrophobic powder. It also showed superior alkali buffering capacity to commercial detergent builder. SFC-NH4 showed higher sizing effect than commercial sizing agent.
      PubDate: 2015-10-31
      Issue No: Vol. 19 (2015)
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