December 2010
Power consumption pattern based on fuzzy method
The experience of many countries worldwide shows that one of the appropriate ways that can make power subscribers (clients) to maintain the consumption power coefficient within the allowed limit is to apply consumption partitioning by controlling electricity consumption power coefficient. In this article, a trial has been made to examine a new method in which we can limit the clients whose consumption power coefficient...
December 2010
Dynamic weighted discrimination power analysis: A novel approach for face and palmprint recognition in DCT domain
Although Discrete Cosine Transform (DCT) is widely employed to extract proper features for biometric recognition, the problem on how to select proper DCT coefficients to obtain the best discrimination effect has not been solved satisfactorily. Some approaches discard the low-frequency DCT coefficients unreasonably and rely on proper premasking window to improve performance. But there is not a uniform criterion to...
December 2010
Vehicle speed detection in video image sequences using CVS method
Video and image processing has been used for traffic surveillance, analysis and monitoring of traffic conditions in many cities and urban areas. This paper aims to present another approach to estimate the vehicles velocity. In this study, the captured traffic movies are collected with a stationary camera which is mounted on a freeway. The camera was calibrated based on geometrical equations that were supported directly...
December 2010
Comparison of robust and intelligent based power system stabilizers
Power System Stabilizers (PSS) are used to generate supplementary damping control signals for the excitation system in order to damp the low frequency oscillations (LFO) of the electric power system. The PSS is usually designed based on classical control approaches but this Conventional power system stabilizers (CPSS) has some problems. To overcome the drawbacks of CPSS, numerous techniques have been proposed in...
December 2010
Tuning of power system stabilizers using particle swarm optimization with passive congregation
Power System Stabilizers (PSSs) are the most well-known and efficient devices to damp the power system oscillations caused by interruptions. This paper introduces a novel algorithm to determine the PSS parameters, using the multi-objective optimization approach called particle swarm optimization with the passive congregation (PSOPC). The tuning of the PSS parameters is usually formulated as the objective function...
December 2010
The study of the effect of protective devices performance on voltage sag due to distribution network faults
Voltage sag is one of the most common power quality disturbances in electric networks. It is necessary to investigate voltage sag due to consumers’ vulnerability. Faults are the main cause of voltage sags in distribution networks. Fault in distribution networks according to its specifications (its location, duration and time) can cause an interruption or a voltage sag at the nodes of the network. By making random...
December 2010
The effect of cure conditions and temperature changes on the compressive strength of normal and fly ash-added concretes
The aim of this study was to examine compressive strength of fly ash-added concrete and normal concrete cured in water and air and to compare their compressive strength on the 7th, 14th, 21st and 28th days. In addition, the study investigated temperature-induced changes in the compressive strength of concrete samples which completed 28 day cure period. While the compressive strength of concretes cured in air was...
December 2010
An experimental investigation of binding types of reinforcing steel rebars subjected to aggressive solutions under cathodic protection against corrosion
Reinforcement corrosion in reinforced concrete structures results in significant reduction in durability and may cause premature failure. This study presents an experimental investigation of corrosion in reinforcing steel rebars with different binding types exposed to aggressive solutions of various concentrations under cathodic protection. The corrosion rate in the steel bars for different types of serial bindings...
December 2010
A characteristic of consolidation parameters of marine clay in Busan Area – South Korea
In this study the city of Busan was selected and investigated for a characteristic of consolidation parameters. Busan is one of representative cities in the southern coast of Korea, where main harbors are located, and many geotechnical investigations were performed due to massive harbor constructions in the past. Consolidation parameters, including pre-consolidation pressure, compression index (Cc), swelling index (Cs),...
December 2010
Material properties of air-cured ultra-high-performance steel-fiber-reinforced concrete at early ages
This study investigated the material properties of air-cured ultra-high-performance fiber-reinforced concrete (UHPFRC) at early ages. To assess the material properties of UHPFRC at early ages, compressive and three-point bending tests were respectively performed at the 10 stages of early ages on ø 100 × 200 mm cylinders and 100 × 100 × 400 mm specimens made from UHPFRC with a 2% steel fiber...
December 2010
Ultimate capacity and reinforcement area requirement for bridge girder using various FRP re-bars
An analytical study on the use of various types of fibre reinforced plastic rebars as reinforcement is presented in this paper. The structural element examined was a girder, which formed a bridge deck and was designed in accordance to the ACI code. Three types of fibres were considered in the reinforced plastic rebar, namely glass, aramid and carbon. A finite element model of the bridge girder was created using solid...
December 2010
Parametric investigation on an off-centre braced frame system's stiffness
In this paper, a particular off-centre braced (OCB) system subjected to lateral load, which induced compressive force to the brace elements is examined. This bracing system consists of three members, where the diagonal member is not straight and it is connected to the corner of the frame by a third member. The out-of-straightness of the diagonal members will introduce eccentricity to the system. This system improves the...
December 2010
Reduction of data size for transmission in localization of mobile robots
In the SLAM (Simultaneous Localization and Mapping) technology, an environmental map is generated by a mobile robot. When it results in failure, it is necessary to inspect the scene. This localization and browsing require transmission of video signal to a remote place. In the system in this paper, an indoor mobile robot has two cameras. One is the "upward" which captures scenery of ceiling. The other is...
December 2010
Growth of several indigenous species in the degraded forest in the northern Vietnam
This study was conducted in the northern mountainous region of Vietnam. Research occurred at two main sites: the Hoa Binh province and the Phu Tho province. The objective of this study was to compare growth rate and the physiological characteristics of the indigenous tree species; with the ultimate goal of selecting a suitable species for the restoration of the degraded forest area. Except for an Acacia hybrid, this...
December 2010
First-principles study on electronic and optical properties of La-doped ZnS
Using the first principle plane-wave pseudo potential method, a systematic investigation on electronic and optical properties of ZnS with and without La-doping has been performed. Calculation results show that La-doping narrows the band gap of ZnS systems and La doped ZnS system changes from semiconductor into metal through the Mott transition. Moreover, with La-doping increasing, the decrease of absorption coefficient...
December 2010
Wave-like interaction, occurring at superluminal speeds, or the same, de Broglie relationship, as imposed by the law of energy conservation: Electrically bound particles (Part 1)
Based on the law of conservation of energy, we have shown that, the steady state electronic motion around a given nucleus in a non-circular orbit depicts a rest mass variation, though the overall relativistic energy remains constant. This is, in no way, conflicting with the usual quantum mechanical approach. On the contrary, it provides us with the possibility of bridging the special theory of relativity and quantum...
December 2010
Effects of exercises on bone mineral density of proximal femour region among athletes of different branches
This study was carried out to evaluate and determine the differences in T and Z values of proximal femour (femoral neck, trochanter, intertrochanter and ward’s triangle) region bone mineral density (BMD) among high level male athletes of different branches. The study was completed with the voluntary attendance of a total of 42 uninjured male national athletes in different branches (taekwondo 12, wrestling 8, judo...
December 2010
University students’ attitudes towards environmental problems: A case study from Turkey
By this research the attitudes of university students towards environmental problems is aimed to be investigated in several variables. The study group of the research are 931 students that attend Karabük University in 2009 to 2010 Academic year. Survey model is used in that study and as a data collection tool “The Attitude Scale of Environmental Problems” which is developed by Åžama (2003) is used....
December 2010
Planetary milling parameters optimization for the production of ZnO nanocrystalline
An artificial-neural-network (ANN) model is developed for the analysis and prediction of correlations between processing planetary milling parameters and the crystallite size of ZnO nanopowder by applying the back-propagation (BP) neural network technique. The input parameters of the BP network are rotation speed and ball-to-powder weight ratio. The nanopowder was synthesized by planetary mechanical milling and the...
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