bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Vibration Characteristics of the Explosion Vessel Using Wigner-Ville Distribution
Authors: Liu Hong Li , Guo Peng , Dong Guo Ling , Liu Jun , Mu Yi
Published: June 2014

The deformation analysis of explosion vessel is very important in strength analysis and engineering design. By means of laser Doppler measurement and Wigner-Ville distribution, the expansion process of steel explosion vessels has been studied, and the frequency characteristics of the strain wave are analyzed. Finally, the experimental results of deformation and vibration frequency of vessel are given under the condition of 300g TNT explosion equivalent.
Investigation of Incoherent Gamma-Ray Scattering Potential for the Fluid Density Measurement
Authors: Wirawan Rahadi , Djamal Mitra , Waris Abdul , Handayani Gunawan , Kim Hong Joo
Published: June 2014

Incoherent gamma ray scattering is a method that can be applied for the fluid parameter characterization. The aim of the present work is to study the potential usage of the incoherent gamma ray scattering measurements to evaluate the fluid density based on the Monte Carlo approach. Enlarging the density of a fluid results in a significant reduction in the intensity of the detected gamma scattering. The difference of the simulation curve slope results in the gamma transmission mode its about 0.02 compared to the experimental result.
Effect of Calcination Temperature on Synthesis of N-Fe-TiO2 for Photocatalytic Degradation of Methylene Blue under Visible Light
Authors: Sikirman Arman , Krishnan Jagannathan
Published: June 2014

Effect of calcination temperature on the synthesis of N, Fe codoped TiO2for the photodegradation of methylene blue under ordinary visible lamps was investigated. The photocatalyst were prepared using solgel method where titanium isopropoxide was used as precursor of titania. The calcination temperatures were varied from 450 to 600°C. The prepared photocatalysts were characterized by using XRD, FE-SEM and FTIR to determine their physical properties. The results from XRD proved that photocatalysts calcined at 600°C possessed perfect properties in phase and crystal size. FE-SEM image analysis revealed the formation of the fine spherical particles and the FTIR analysis verified the presence of dopants at various calcination temperatures. The effectivity of photocatalysts was tested by performing a standard batch photocatalytic degradation experiment with methylene blue as a model pollutant under ordinary visible light. The result showed that N and Fe codoped photocatalyst calcined at 600°C (1.0 % N, Fe-TiO2-600) yielded a maximum of 80.50% methylene blue degraded within five hours of irradiation time.
Research on Electronic Implementation, Circulation Process in PDM System
Authors: Yin Hai Jun , Pan Xin , Li Xiao Dan , Su Xue Ming
Published: June 2014

In this paper, the structure management technology of document is achieved by the secondary development of the PDM system. The paper-documents is canceled, the change files of design and process documents are implemented and circulated by electronics process in PDM system. The statistics and bulletin board function is added, the implementation and circulation process of design change files and process documents can be real-time monitoring.
Analysis of the Concentration of Pollutants Based on Wavelet Analysis
Authors: Yu Li , Wang Jia Quan
Published: June 2014

The main pollutants in Huaihe river city average concentration time series, for example, according to the basic principles of the wavelet analysis, the application of wavelet decomposition and reconstruction of Huaihe river main pollutant concentration changes of time sequence is analyzed by the major pollutants of Huaihe river in changing trends and mutation characteristics. The results of the study show that, wavelet analysis is applied to the analysis of the concentration of pollutant time series is feasible.
Hardware Design of Nature Gas Engine ECU Based on Single Chip
Authors: Wang Xin Li , Ping Xu
Published: June 2014

Gas supply method plays an important role in engine performance for natural gas engines (NGE). In order to overcome the low charging efficiency of pre-mixed fuel gas supply method the multi-point injection (MPI) gas engine controller hardware system is designed in this paper. For the nature gas engine controller the main controller is selected as the microcontroller MC9S12XSl28, then the circuitry for semiconductor piezoelectric air pressure sensor, potentiometer throttle position, thermistor temperature sensor, a magnetic-electric sensor for detecting the top dead center (TDC) and simulating engine speed are designed. What have done above is the base of software design. Key Words: nature gas engine; controller; hardware design
Fabrication of 1-3 Cement-Based Piezoelectric Ultrasonic Sensors for NDE Applications
Authors: Xie Xin Chun , Zhang Jin Sen , Xu Dong Yu , Guo Xiao Jing , Sha Fei , Huang Shi Feng
Published: June 2014

This paper described fabrication and comparison of embedded ultrasonic sensors for NDE applications. A 1-3 cement-based piezoelectric composite was used as the sensing element of the ultrasonic sensor. As a front matching layer between test material and piezoelectric materials, cement/epoxy resin was selected. In order to make the backing materials for sensors had enough acoustic attenuation performance, the backing material of sensors doped with tungsten powder. When the mass ratio of tungsten/cement backing was two and the thickness of cement/epoxy resin front-face matching was 3mm, the 1-3 cement-based piezoelectric ultrasonic sensor showed a significant enhancement in both relative pulse-echo sensitivity and-6dB bandwidth. These promising results suggested the great potential for developing high-performance ultrasonic sensors using the 1-3 cement-based piezoelectric composite.
The Study on High Way Traffic Capacity Based on the Maximum-Flow Algorithm
Authors: Wang Ke Nan , Wang Hai Xing
Published: June 2014

The high way with its characteristics of high flow, fast, safe and comfortable, has played an important role in road traffic. In this paper, based on the maximum-flow algorithm, study on the traffic capacity of highway. Firstly, explain the basic theory of highway traffic capacity.Then, focusing on the method of maximum-flow algorithm to calculate the highway capacity, convert it into usable calculation mathematical model, explain the problem and cite an example.Finally,summarized the full text of the research work. The main research achievements and innovation in this paper is studying the highway network capacity from the macro level, use a quantitative study on the highway traffic capacity of the network.
Monotonic Convergence Analysis for 2-D Roesser Systems via a LMI Approach
Authors: Li Zhi Fu , Hu Yue Ming
Published: June 2014

The monotonic convergence (MC) property of discrete two-dimensional (2-D) systems described by the Roesser model is studied. The MC problem of the 2-D system is firstly converted to two H∞ disturbance attenuation problems of the traditional one-dimensional system. Then, the sufficient condition is derived for the MC, which is given by two linear matrix inequalities (LMIs). Furthermore, it can be shown that either of the LMIs can also guarantee the Bounded-Input Bounded-Output (BIBO) stability of the 2-D system. Finally, a simulation example is given to show the effectiveness of the LMIs condition.
Creation of Coherent Superposition State by Stimulated Raman Adiabatic Passage in Serial Multi-Λ-Type System
Authors: Shu Xiao Qin , Deng Chi , Kuang Ye , Yang Jian Hui , Liu Yi Ding
Published: June 2014

We propose a scheme for creating coherent atomic superposition states via the technique of stimulated Raman adiabatic passage (STIRAP) in a Λ-type system where final states are composed of manifold of levels and the intermediate levels could be more than one level. If the pump pulses and Stokes pulses are kept in the same order of ordinary STIRAP, through the control the delay time between the Stokes pulses and pump pulse, we could create arbitrary superposition states in the manifold of levels.
Dye Decolourization of the Remazol Dye in Textile Effluent by Using Bambusa heterostachya
Authors: Nurhaslina C.R. , Nur Hazirah R. , Ku Hamid Ku Halim
Published: June 2014

Enlargement of textile industry in Malaysia is swiftly growing as it plays vital role in human evolution by providing cloths. Industrialization in textile fields plays main part in colouring of fabric as it gives environmental concerns associated with textile effluent. The usages of dyestuff make textile effluent difficult to biodegrade as the complexity of chemical structures of dyes. The diversity of forestry creates nature plant such as bamboo which is used as mediator in dye decolorize of textile effluent. As sustainable resolution can reduce environmental system destruction, the effectiveness and competency of bambusa heterostachya has been investigated to analyze the potential in decolorize of textile effluent. The result exhibited good dye decolourization rate of 70 - 80 % in less than 72 hours with influence studies.
Gas-Liquid Mixer Design of Multiphase Flow Experimental Apparatus
Authors: Peng Hui Ying , Zhou Mo , Li Meng Xia
Published: June 2014

Multiphase flow experimental facility is an indispensable part in the construction of laboratory of oil and gas storage and transportation, and the gas-liquid mixer is an important part of the experimental facility. Because the existing gas-liquid mixer has certain limitation, the author designs a new type of gas-liquid mixer on the base of existing mixer. Finally, through calculation of CFD simulation software, the new mixer can achieve good mixing effect and satisfy the requirement of experiment.
Thermal Characterization of Lithium Polymer Battery Module for Electric Vehicle Application
Authors: Maruvada Teja , Patidar Lalit , Patel Meet
Published: June 2014

Modern day electric vehicles and hybrid vehicles which run completely/partially on electric power typically use lithium polymer cells to build the battery module. The high energy density of the lithium polymer cells makes them desirable compared to others. These battery modules get heated up as high currents pass through the cells, which are arranged in stacks. Thermal management of cells is one of the main factors to be considered in the battery module design. A properly designed thermal management system is crucial to prevent overheating and uneven heating across a large battery module of lithium polymer cells, which can lead to degradation, mismatch in cell capacity and thermal runaway. A Three dimensional transient thermal analysis of cell stacks is performed in ANSYS workbench under the required operating conditions and a temperature profile of each and every point is obtained. An experimental setup is designed and built to simulate both the thermal and electrical conditions of the battery module in order to determine the thermal performance of the cell stacks. The simulation results are validated with the experimentally obtained results.
Bio-Diesel from Almond Oil as an Alternative Fuel for Diesel Engines
Authors: Abu-Hamdeh Nidal H. , Alnefaie Khaled A.
Published: June 2014

Different fuel blends containing 10, 30 and 50% almond oil with diesel fuel were prepared and the influence of these blends on emissions and some performance parameters were inspected using a diesel engine. The blends and the diesel fuel were examined under various load conditions and the results showed that almond-blended fuels have slightly different properties than diesel fuel. Measured engine performance parameters have generally showed a slight increase in exhaust gas temperature and in brake specific fuel consumption, and a slight reduction in brake thermal efficiency. Blending of almond oil with diesel fuel reduced the engine CO and increased NOx percentages.
A Way to Determine the Economic Operation Mode of Substation Transformer
Authors: Zhao De Li , Zhang Hui Lin , Liu Feng Zhen , Zhao Xin
Published: June 2014

By analyzing the main transformer substation operation mode change various calculation methods of loss are conducted on how to determine the economic operation mode of the double main transformer substation. According to load changes, in order to achieve best value for economy it is neccessary to reduce variable transformer loss. In this paper, a practical method of substation transfomer determination is analyzed.
The Design of Battery Management System Based on MC9S08DZ60 and the Monitor Backstage Based on VB6.0
Authors: Lin Ju Guang , Zhao Shuo
Published: June 2014

This paper has designed the battery management system based on microcontroller MC9S08DZ60 for real-time monitoring for all battery parameters of the battery and realizing charge and discharge. This system is mainly consisted of current and voltage module, the temperature detection module, charge and discharge module and CAN communication module. It can implement the charge and discharge of the battery by analyzing the data of each battery parameters. Besides, this paper has designed the monitor backstage based on VB to get real time display and control of the voltage parameter which needs monitoring and controlling. At last, this paper also has applied USB - CAN set instruments to implement the communications and the connection between battery management system and PC communications.
Numerical Simulation of Heat Transfer for the Ethyl Benzene Dehydrogenation Catalyst in the Kiln
Authors: Wang Zheng Tao , Liu Wei Wei , Xu Jing Jing
Published: June 2014

In industrial reactors, the chemical or physical transformations are always expected to occur in the best way, so the performance controlling processes associated with mixing of reactants, heat transfer, contacting of multiple phases, mass transfer, chemical reactions, and phase changes are important. In this paper the heat transfer simulation of the gas-solid multiphase flow in ethylbenzene dehydrogenation catalyst kiln, heat conduction, convection and radiation involved, has been expressed by using the computational fluid dynamics (CFD) method. The present study can contribute to our better understanding of the heating process and at the same time, the thermal power distribution and temperature variation of the fluid and catalyst particles can provide guidance for the kiln design.
To Study Different Losses and Loss Co-Efficient on Solar Flat Plate Collector at 900 Yaw Angle
Authors: Bhatt M.K. , Sutaria B.M. , Gaderia S.N. , Channiwala S.A.
Published: June 2014

The flat plate collector is a device used for harnessing the solar energy. The efficiency of this device is dependent on the various heat losses. These losses are bottom loss, side loss, edge loss, corner loss, sealing loss & top loss. These losses are measured as well as recorded. There are forty eight thermocouples located at different points. The input energy is through the electric heaters to the collector. These heaters are kept below the absorber. The capacity of each heater is 0.5 kW. These heaters are two in number. The wind velocity is measured by the vane type anemometer. The input heat flux is kept constant & wind velocity is varied. The evaluation of various heat losses is important for the performance evaluation of the collector. Generally the upward heat losses play an important role in the total heat losses. The present paper is an experimental simulation of a horizontal single glazed flat plate collector. The losses are measured under steady state conditions at different wind velocity & keeping 900yaw angle and at zero tilt angle.
The Quantitative Forecast and Suppression on the Electromagnetic Radiation from Low Voltage Frequency Converter
Authors: Gao Cheng Hai , Wan Jian Ru , Li Jiang
Published: June 2014

The main electromagnetic radiation source and the generating mechanism in low voltage frequency converter were defined and analyzed in this paper according to electromagnetic radiation theory together with the discussion of the impact on radiation from raise time, falling time of pulse width modulation (PWM) signal and carrier frequency, so that the radiation can be understood more exactly in term of numerical value change, which helps specifically reduction of converter radiation during design phase in compliance with related international standards and technical norms regarding industrial converter. Started with the theory of electromagnetic field the zone around converter were differentiated and analyzed based on the radiation characteristics. As main means of radiation suppression in converter shielding and grounding were quantitatively analyzed. A series of tests with different power rating converters verified the calculation and analysis. Consequently the design of converter was guided to meet the requirements of standard.
A Preliminary Study of the HPN Robot
Authors: Sun Hao , Cheng Bin , Wang Ning Yang , Chen Xiao Ping
Published: June 2014

Soft robots are robots made of soft materials and actuators. Previously we proposed the HPN (Honeycomb PneuNets) Robot, where PneuNets were placed as actuators into honeycomb shaped elastomer. In this paper, we present some progress of this effort. A random search algorithm is applied to plan the obstacle-avoid movements of an HPN robot. We test it through several cases, and the results showed that the algorithm can work effectively. We introduce an HPN robot prototype, which is made of RTV-2 silicone rubber. Preliminary experiments showed that some good expansion rate and flexibility can be achieved. A piston and soft body simulation model of HPN robots is also presented, which can mimic the basic behaviors of the HPN robot.
Numerical Simulation on Moulded Thin-Walled Parts via Injection Moulding Process
Authors: Azaman M.D. , Sapuan S.M. , Sulaiman Shamsuddin , Zainudin E.S. , Khalina Abdan
Published: June 2014

The current trend in the industry is to produce thin, light weight, and environmental products. In this project, flat or shallow thin-walled parts were designed and moulded lignocellulosic polymer composites (PP + 50 wt% wood) to visualize the processability via moulding simulation. This studied focused on the filling, shear stress at wall, and in-cavity residual stresses behaviors. The shallow thin-walled part is preferable in moulding PP + 50 wt% wood due to economically in processing, low shear stress distribution and low residual stresses than the flat thin-walled part.
Research on Inverse Control of Active Magnetic Bearing Based on Fuzzy Inverse Model
Authors: Jiang Wen , Su Yi Xin , Zhang Dan Hong
Published: June 2014

For magnetic bearing system with characteristics of zero damping, negative stiffness and nonlinearity, this paper put forward a method of inverse control based on the fuzzy inverse model. The fuzzy system with fuzzifier and defuzzifier was used as an interpolator to approximate the inverse model of magnetic bearing. Then we connected the fuzzy inverse model in series with the magnetic bearing system to form a generalized pseudo linear plant, and selected a PID controller to control the pseudo linear plant. The fuzzy inverse model and the PID controller together formed an inverse controller to implement the closed-loop inverse control of the system. The simulation results demonstrate that the inverse control can reduce the overshoot, shorten the settling time, and make the rotor levitate in a larger range.
Mechanical Design of Mini Automated Storage and Retrieval Warehouse System for Electronic Components
Authors: Sim K.S. , Ng E.F.
Published: June 2014

Automated storage and retrieval warehouse systems (ASRS) have been implemented in industrial for few decades. This kind of combination of project has become common in current industry field. Refer to Pa. Pittsburgh, the enhancement of ASRS has helped to improve optimal stock capacity in limited space and minimize process flow time. The purpose of this project is to design a hardware prototype that can fulfill the concept of ASRS and can be implemented at electronic components store that requires store management. This is to improve the process in stock checking and also store or retrieve item. Furthermore, there have several major parts that can be considered to use this hardware such as method of store and retrieve, storage structure, movement of the machine and machine travelling system. The timing belt system is implemented on this hardware for performing linear X-Y-Z motions. Besides, the concept of pallets supported rack had been implemented in storage structure design. Last but not least, the concept of an automated guided machine travels to the desired location on rack is selected as a store and retrieve method for this hardware.
Wheel Synchronization Control in Steer-by-Wire Using Composite Nonlinear Feedback
Authors: Saruchi Sarah Atifah , Zamzuri Hairi , Mazlan Saiful Amri , Fahami Sheikh Muhammad Hafiz , Zulkarnain Noraishikin
Published: June 2014

This paper proposes a new control strategy to ensure the steering wheel and front wheel synchronization in Steer-by-Wire (SBW) using a Composite Nonlinear Feedback (CNF) controller. CNF is a combination of linear and non-linear feedback control laws. This controller is designed in order to minimize the delay in settling time, achieve fast rising time and lower the overshoot for the front wheel response. A simulation based on this control strategy was made and compared to analyze the system performance.
Modeling and Optimization of Laser Polishing Process
Authors: Rosa Benoit , Hascoet Jean Yves , Mognol Pascal
Published: June 2014

Laser polishing is a finishing process based on melting material, with the objective of improving surface topography. Some operating parameters must be taken into consideration, such as laser power, feed rate, offset, and overlapping. Moreover, because of its dependence on the primary process, the initial topography has also an impact on the final result. This study describes a quadratic model, conceived to optimize final topography according to the primary process and laser polishing. Based on an experimental matrix, the model takes into account both laser operating parameters and the initial topography, in order to predict polished surfaces and to determine optimal set of parameters. After the phase of experimentation and the creation of the quadratic model, an optimal final topography is introduced, taking into account the initial surface and the laser parameters.
The Variable Steering Ratio for Vehicle Steer by Wire System Using Hyperbolic Tangent Method
Authors: Fahami Sheikh Muhammad Hafiz , Zamzuri Hairi , Mazlan Saiful Amri , Saruchi Sarah Atifah
Published: June 2014

In conventional steering system, during the parking maneuver, driver required large turned on the steering wheel to move the fornt tyre. Thus, it will increase the driver burden when turned the steering wheel. The feature of variable steering ratio (VSR), help to reduce driver burden. Moreover, it improves the vehicle maneuver at lower and high speed. This paper, proposed a control algorithm of variable steering ratio (VSR) in vehicle SBW system. The concept of hyperbolic tangent is used where it not only improved the maneuverability at lower speed, but also reduces the driver burden on the steering wheel. To investigate the effectiveness of the proposed VSR algorithm, the result is compared with conventional steering system
Mathematical Modeling of Electromagnetic Levitation Based Active Suspension Using Bond Graph
Authors: Mishra Anand Kumar , Kumar Romil , Sarangi Somnath
Published: June 2014

This paper offers motivation for modeling and simulation of an electromagnetic levitation based active suspension system (EMLASS) using bondgraph. Model of EMLASS contains 2 electromagnets as an unsprung mass and one magnet as sprung mass. Levitation based suspension is a novel technique to develop an active suspension over current technology. It has a high dynamic capability which is more sensitive for the road irregularities and its advantage is to provide additional stability to eliminate the effect of road irregularities. Our goal is to develop mathematical modeling and bondgraph modeling of EMLASS.
Remote Monitoring Technology and its Application to Control of Industrial Power Supply
Authors: Zhu Jin Hong , Wei Ze Guo
Published: June 2014

In this paper, remote monitoring technology and its application to control of industrial power supply are discussed in detail, including its composition, function and classification. The two approaches of wired and wireless communication are analyzed, and four cases of typical systems are introduced as well. Practice has proved that the presented several control schemes are feasible and effective.
Materials Development and Hardness Properties of Aluminum Alloy
Authors: Hasa Muhammad Husna Al , Masrukan  , Adhi Arief Sasongko
Published: June 2014

This research aims to develop an aluminum alloy suitable for applications in the nuclear industry, particularly in terms of its hardness. A synthesized AlFeNiMg alloy plate was subjected to deformation in a gradual rolling process at room temperature. A Vickers hardness tester and an optical microscope were employed to analyze the hardness and to observe the microstructure of the aluminum alloy consecutively. Analyses of elements and phase structures were performed by EDS-SEM and X-ray diffraction. The result shows that the hardness of AlFeNiMg alloy increases along with the increase in rolling deformation. The alloy hardness increases from 88 HV to 113 HV, 135 HV, 153 HV and 165 HV at percent cold reduction of 30%, 53%, 65% and 88% consecutively. From the microstructure observation, the grains tend to get more elongated along with increasing rolling deformation. The pattern analysis of X-ray diffraction shows that there are two phases, namely α and θ (FeAl3).
Machine Learning Tools in Machinery Faults Diagnosis: A Review
Authors: Hui K.H. , Hee Lim Meng , Leong M. Salman
Published: June 2014

Machinery faults can be detected by various signal processing tools; however, they require human expertise to achieve maximum success. Machine learning tools can help to achieve automatic machinery-faults diagnosis. This paper provides a brief review of the most common machine learning tools.
Experimental Study of Electric Bicycle Charging Fault Simulation
Authors: Wu Ying
Published: June 2014

This article selects an intelligent pulse three-stage charger commonly used in electric bicycles and conducts fault simulation tests of the charger under different environmental conditions based on analysis of the charging characteristics of a lead-acid battery. The test proves that the fault of the charger may lead to breakdown or explosion of the electronic devices of the charger; however, the possibility of a fire inside the charger is very small because of limited temperature rise of heating components in the charger, a small amount of combustible materials in the components, flame retardant plastics-made charger housing, etc. A fire inside the charger easily results in short circuit of connecting lines. If there is no a protective device, the electric bicycle easily catches fire.
A Novel Application for the Emulation of Sensor Net-Works
Authors: Song Xiao Jing , Pan Jun
Published: June 2014

Many futurists would agree that, had it not been for architecture, the synthesis of B-trees might never have occurred. Given the current status of mobile methodologies, physicists clearly desire the deployment of the memory bus, which embodies the practical principles of cryptography. Here we construct a novel application for the emulation of sensor net-works (Spray), validating that congestion control and voice-over-IP can cooperate to overcome this grand challenge.
The Effect of Zr Content in the U-ZrHx Alloy Powder on Density, Heat Capacity, and Morphology
Authors: Masrukan  , Hasa Muhammad Husna Al , Yusnitha Erilia
Published: June 2014

Experiment in the making of U-ZrHx powder at Zr content variation for PWR reactor fuel has been carried out. At first, U-Zr ingots was made with Zr content of 35wt% (U-35Zr), 45wt% (U-45Zr) and 55wt% (U-55Zr). Then U-Zr ingots were used to make U-ZrHx powder through hydriding technique. Hydriding process carried out at temperatures of 450° C with vacuum pressure of 14.80884 x 10-3 psi and under hydrogen gas flowing for 10 hours. Then U-ZrHx powders were tested to determine the characteristics such as density, heat capacity, and morphology. The test results showed that the density of the U-ZrHx decrease with increasing Zr content. The density are 10.4256 g/cc, 8.000 g/cc respectively, and 7.0359 g / cc for U-35ZrHx, U-45ZrHx and U-55ZrHx alloy. The heat capacity test results showed that the highest heat capacity is achieved at U-45ZrHx alloy powder that measured up to temperature of 437° C that is equal to 0.37J/g.°C. When observed from the test temperature, indicate that the heat capacity value for each sample examination decrease with increasing the test temperature. Meanwhile, the powder morphology examination result showed that all the U-ZrHx powder sample have a flat shape, irregular and tend have the smaller particle with higher increasing the Zr content.
Scheduling with Discretely Compressible Processing Times to Minimize Makespan
Authors: Zhang Shu Xia , Zhang Yu Zhong
Published: June 2014

In this paper, we address the scheduling model with discretely compressible processing times, where processing any job with a compressed processing time incurs a corresponding compression cost. We consider the following problem: scheduling with discretely compressible processing times to minimize makespan with the constraint of total compression cost on identical parallel machines. Jobs may have simultaneous release times. We design a pseudo-polynomial time algorithm by approach of dynamic programming and an FPTAS.
Effect of Co Doping on the Properties of Ce0.75Zr0.25O2 Nanocatalyst
Authors: Nor S. Hanim Md , Shah M. Nazri Abu , Hadi Abdul , Ismail Kamariah Noor
Published: June 2014

5wt% Co deposited on a support catalyst Ce0.75Zr0.25O2 mixed oxide were prepared by combination of microemulsion and deposition-precipitation method followed by calcinations at temperature 500°C. The microemulsion component comprise of cetyl trimetyl ammonium-bromide (CTAB), 1-butanol, n-octane and aqueous solution. Sodium hydroxide (NaOH) was used as precipitation precursor for the preparation of water-in-oil microemulsions method. The particles were characterized by X-ray diffraction (XRD), N2 adsorption-desorption analysis and Field Emission Scanning Electron Microscopy (FESEM). The results showed the preparation method has significant influences on the textural and structure properties of Co/Ce0.75Zr0.25O2. The formation of Co/Ce0.75Zr0.25O2 inhibit the better performance based on the particles size, specific surface area and particle distribution of cobalt into Ce0.75Zr0.25O2.
Overview: Modification of Cerium Oxide in Three-Way Catalysts
Authors: Shah M. Nazri Abu , Nor S. Hanim Md , Ismail Kamariah Noor , Hadi Abdul
Published: June 2014

An overview of modification of cerium oxide, CeO2which is employed in the three-way catalyst (TWCs) is presented in this article. The modifications of cerium oxide, CeO2incorporated with the metal oxides for the improvement of thermal stability, microstructure and oxygen storage capacity (OSC) are discussed. In view of that, the types of metal oxide are grouped into transition metals, rare earth metals, and alkaline metals and the effect of each group into cerium oxide, CeO2are elaborated.
Experimental and Numerical Analysis of Timber-Lightweight Concrete Composite with Adhesive Connection
Authors: Kanócz Ján , Bajzecerová Viktória , Mojdis Marek
Published: June 2014

In this paper experimental and numerical analysis of timber-lightweight concrete composite floor elements with glued shear connection under short term loading is presented. The composite connection of two materials by special adhesive for bounding wet concrete to timber was performed. For experimental test and theoretical analysis two type of composite beams was used. Comparison of test with theoretical results is finally presented.
Experimental Testing for the Analysis of a Landslide Phenomenon Produced in a Hillside Area from Romania
Authors: Dobrescu Cornelia Florentina , Calarasu Elena Andreea , Stoica Marius , Moldoveanu Traian , Tamas Florin Tamas
Published: June 2014

The landslide that is the subject of this paper occurred in the central part of Romania, in Prahova County, located near the Prahova Valley, in hillside area, frequently affected by this kind of major hazard. The geological phenomenon occurred in the area is an old event and it was reactivated starting with 2010. The inappropriate geological and geotechnical conditions characteristic of the area and also the lack of a drainage system were conducted to landslide reactivation during a period of intense rainfall. The present work was carried out to study the spatial influence of geological and morphological factors upon landslide occurrence on a local scale by using geotechnical and geophysical methods in order to determine local trigger parameters. The complex studies were conducted in finding the most feasible technical and economical option for the efficient emergency management of landslide hazard.
Impact of Seismicity on Stability of Earthen Dam Slopes
Authors: Harabinova Slavka , Panulinova Eva
Published: June 2014

The impact of seismicity on stability of earthen dam slopes is discussed in the article. The analysis of the slope stability of the Domaša Dam was carried out. Petterson, Bishop and Sarma methods were employed for the calculations while taking into account the seismic actions according to EN1998-1.
Insulation - Technical Analysis of Ground Connections and its Impact on the Solution of Substructure Design Details
Authors: Sedláková Anna
Published: June 2014

Most industrial hall type buildings are large. The accurate design of the substructures construction is influenced by many entry parameters from the standpoint of structural analysis, building thermal technology, building hydro-insulation technology and anti-radon measures. By respecting these specific requirements of individual science disciplines, the symbiosis expressing the optimal solution in the theory of structural production of buildings are presented.
Methods for Analyzing the Stability of an Earthen Dam Slope
Authors: Panulinova Eva , Harabinova Slavka
Published: June 2014

The slope stability of a water construction in four cross-profiles is analyzed in the article and the factors of safety reviewed. The GEO 5 software package for slope stability calculations is an essential component of work. The computer software was employed to simulate and calculate the stability in the particular profiles of the downstream and upstream slopes of the Domaša Dam. Bishop, Petterson and Sarma methods were applied to determine the critical factors of safety.
Narrow Reinforced Concrete Slabs after their Flexural Destruction
Authors: Wieczorek Mirosław
Published: June 2014

In the course of the exploitation of building structures frequently situations turn up, in which the structure is not adequately used (it may, for instance, be exposed to considerably greater loads than previously been intended). In the state of an unforeseen overload of the structure, essential reserves of their load-bearing capacity may be disclosed in the case of the self-acting work as a flexible strand. The paper presents the results of investigations concerning the influence of the parameters of reinforcing steel on the mechanism of the destruction of six single-span models of narrow reinforced concrete slabs, in which a horizontal shift of the supports was not possible. The tests were carried out on narrow slabs with the dimensions 3860×480×100 mm. The results of the tests were compared with analytical calculations.
Nonlinear Analysis of Underground Walls in Interaction with Subgrade
Authors: Prekop Ľubomír
Published: June 2014

Effects of interaction between the structure and the subgrade represent an important factor that has to be considered within the structural design. Foundation structures as the bearing parts enter the structure-subgrade interaction processes considerably and the calculations have to be performed in detail. The paper presents modeling of the contact between the sheeting wall and the surrounding soil. Characteristics of particular contact elements used in ANSYS software follow. 2D and 3D models of the wall-soil contact have been created using various input data. In the conclusion, the obtained results have been presented and compared.
Analysis of Causes of Mold Growth on Residential Building Envelopes in Central City Zone of Košice
Authors: Tóth Stanislav , Vojtuš Jaroslav
Published: June 2014

Water may easily penetrate into a walling in two stages, in a vapor phase and liquid phase. Externally it makes itself as a typical dark moist map, painting and plaster gradual destruction and subsequently even walling decomposition. Mentioned phenomena further affects indoor environment relative humidity, especially in a basement floor, in floors partially embedded into ground, but also in ground floors. Buildings are unusable from statically and hygienic points of view by a high humidity combined with high salinity, biologic offenders and often water free inflowing.
Probabilistic Simulation of the Mechanical Response of a Pre-Stressed Railway Sleeper: Initiation and Propagation of Cracks during Static Test
Authors: Řoutil Ladislav , Veselý Václav , Keršner Zbyněk
Published: June 2014

The paper deals with the mechanical response of a pre-stressed railway sleeper during a standardized static loading test estimations of the variability of the sleepers response and especially the probabilities of the occurrence of cracks of specific widths at specific load levels (as a consequence of random concrete parameters) based on the results of (3D) numerical models are presented. The paper follows on from and extends previous results obtained by the authors research team in cooperation with specialists from the sleeper manufacturing company ZPSV a. s.
Problems with Variability in Using Fly Ash in Mixed Cement
Authors: Zobal Ondřej , Padevět Pavel , Šmilauer Vít , Bittnar Zdeněk
Published: June 2014

The use of fly ash as a substitute for cement clinker brings some benefits, but also problems. One of the biggest problems of using fly ash in general is its high variability. This paper is dedicated not only to the variability of fly ash in the Czech Republic, but the issue of different water absorption of fly ash is described here as well. In addition, one of the options for coping with variability is stated here. If we follow one of the main indicators for sorting fly ash, which is the grading curve, we can optimize the use of ash produced. Based on grading curves, the mixing of various ash fractions was optimized with regard to the porosity of the mixture. Porosity has a direct effect on the compressive strength of the resulting material. This optimization will subsequently be verified experimentally.
Remarks to the Complex Modelling of Concrete Structures: From Experiment to Reliability Assesment
Authors: Novák Drahomír , Řoutil Ladislav
Published: June 2014

The paper describes a summary of the complex approach to evaluation of quasi-brittle structures/structural members made of (advanced) cement based composites. It reviews chosen aspects and results of nonlinear stochastic analysis of structural members made of these composites and inserts them into the complex methodology. Application example illustrates the methodology.
Sandwich Beam in Four-Point Bending Test: Experiment and Numerical Models
Authors: Piovár Stanislav , Kormaníková Eva
Published: June 2014

The numerical modeling of lightweight sandwich beam in four-point bending, using combination of finite elements by help of two modeling approaches 2-D and 3-D models is presented. The mechanical results of hot-dipped zinc steel face layers and polyurethane foam core, obtained from comprehensive material testing program, were used as input data in order to implement the finite element analysis by the commercial ANSYS code. The material nonlinearities, most pronounced in the core, as well as geometric nonlinearities are included in the models. As was shown an advantage of plane stress condition can be applied in numerical models in one-way bending.
Software Application for Optimizing a Method Used to Waterproofing Rehabilitation for Building Infrastructure
Authors: Tamas Florin Lucian , Ungureanu Valentin Vasile
Published: June 2014

For constructions affected by capillary moisture, choosing the right method, in order to remove these deficiencies, is always a challenge. There are known several technologies that can solve the rising damp problem in old buildings, such as castles, cathedrals or churches. Therefore we mention here only the treatment which consists in cutting wall procedure. The aim of this article is to present a software application created in order to optimize one of the most effective technical solutions.
Stability and Vibration of Imperfect Column and Slender Web
Authors: Šnirc Ľuboš , Ravinger Jan
Published: June 2014

Using the geometric non-linear theory (The Total Lagrange Description) in dynamics we can establish the problem of the natural vibration of the structure including the effects of the structural and geometrical imperfections. The incremental stiffness matrix can take into account the residual stresses (structural imperfections) and the geometrical initial displacements (geometrical imperfections) as well. The behaviour of columns, frames and thin-walled structures is sensitive to imperfections. This theory and results can be used as a base for the non-destructive method for the evaluation of the level of the load and the imperfections.
The Intumescent Paint Layers Thickness Influence on the Load-Bearing Capacity of the Steel Joints
Authors: Száva Ioan , Jármai Károly , Vlase Sorin , Bodnár Tibor , Ungureanu Valentin Vasile , Gálfi Botond Pál , Dani Péter , Munteanu Renáta , Tamas Florin Lucian
Published: June 2014

In order to improve the steel structures protection against fire, the intumescent paint method can be applied along with other methods. The intumescent paints layers numbers have to be optimized though. An uniform layer of intumescent paint, foreseen to protect the whole structure, represents both a higher cost and an uneconomical solution. The authors started examination on this problem, by analyzing one of the most recommended steel joints from the earthquake-proof criteria. The conceived and realized original electric furnace allows both a high-accuracy tuning/adjustment of the temperature and a good-stability of its, by means of the original electronic command. In order to perform high-accuracy and full-field monitoring of the displacements, the authors used a modern optical non-contact system, the Video Image Correlation one. The obtained preliminary results are very promising and will be continued in the next period by this international team.
The Welding Process as a Local Issue with Global Consequences
Authors: Al Ali Mohamad
Published: June 2014

The welding process causes transient thermal stresses and non-continuous plastic strains around the weld due to the induced high temperatures. Uneven heating and cooling during the welding process cause a residual stresses in the welded member. The paper deals with the local influence of welding process and its global consequences at the creation and final redistribution of welding stresses. The paper also presents a verification of Modified empirical formulae, developed by the author, using experimental results of research program oriented to the effects of welding stresses and beams local stability [1, 2 and 3].
Using of Computer Fluid Dynamics in Simulation of the Waste Reserviors Processes
Authors: Leoveanu Ioan Sorin , Kotrasova Kamila , Kormaníková Eva
Published: June 2014

The paper scope consists in using the computational fluid dynamics for the simulation of waste reservoirs processes like the flood filling regime, flow over the dam in flood filling, and earthquake disaster. The flood regime may induce a particularly dynamics pressure on the dam walls and a particularly distribution of fluid flow inside liquid. On the other hand, when the disaster like earthquake occurs, the fluid dynamics and the induced pressures on the dam walls become extremely important for safety estimation of critical components. The dam break case is extremely important in management of safety buildings in the neighboring area of the reservoirs too. Solutions of these important civil engineering problems were obtained using the classical Navier-Stokes fluid flow equations. In the analyzed cases, the simulations were based for solving the problem of fluid with the free surface flow and complex boundary configurations by using an original program developed with MAC method.
Comparation of Numerical Methods for Calculation of Thin Slabs
Authors: Sucharda Oldrich , Kubosek Jan
Published: June 2014

The purpose of this paper is to compare calculation of internal forces and deformations of slabs for two calculation methods: the finite element method and the finite difference method. Two concrete slabs have been analysed. In the case of the finite element method, different element mesh are used, providing, thus, solutions in different variants. The calculation and algorithms is based on a thin slab theory. Variants calculate in program Scia Engineer effects of shearing forces by means of the Midlins theory or thin slab theory. Algorithms for the calculation were developed in Matlab.
A Scarf Joint for Reconstructions of Historical Structures
Authors: Fajman Petr
Published: June 2014

This Traditional joints used for the restoration of historical timber structures are not designed according to standards. A very common joint is a vertical splice skew with a key. Unfortunately, the forces mutually acting in its separated parts are not known. It is only their limits that may be derived with some accuracy, but even this is very valuable for practice. The accurate values may be obtained from measurements or experiments.
Reconstruction Method of Reconfigurable Machine Tool Based on Task Polymorphism
Authors: Zhou Feng Xu , Li Ai Ping , Xie Nan , Xu Li Yun
Published: June 2014

For the problem of reconfigurable machine tools existing in the field of manufacturing and processing cost, the reconfiguration strategy of a reconfigurable machine tool (RMT) was proposed based on the analysis of polymorphism processing tasks. Firstly, the models of fixed cost and reconstruction cost in per production cycle were built. On this basis, the cost model of RMT during the whole production cycle was built. Then the Dijkstra’s algorithm was used to solve the model and the optimal reconstruction program was obtained. Finally, a RMT for the engine block production was taken as an example to verify the validity of the model and the method.
Improved Model by Grouting Graded Gravel in Subgrade Surface Layer
Authors: Zhang Zhen , Luo Man , Liu Yuan
Published: June 2014

As the major component of surface layer in subgrade, the frost heave of subgrade is determined the frost heave of graded gravel. The remediation of frost heave of graded gravel by grouting was introduced, the properties of slurry and the actual condition of roadbed, the method of model improvement tests by grouting have been investigated, and the grouting effect of model test was analyzed, the results indicate that: the slurry have been shown well bounding with the graded gravel and the groutability of the slurry met the test requirement. The permeability of graded gravel decreased significantly after grouting, and the permeability of graded gravel could be improved by grouting. The frost heave of graded gravel after improved meet the requirement of passenger dedicated line. The model test of grouting provided an reference to the field grouting test of graded gravel in subgrade.