Search

Aluminum alloys exhibit poor weldability by conventional fusion welding process. The heat treatable aluminum alloy AA2014 is extensively used in the aircraft industry because it has good ductility and high strength to weight ratio. In this paper the effects of welding parameters and tool profile on the mechanical properties of friction stir welded butt joints of dissimilar aluminum alloy sheets AA6082 and AA2014. The process parameters such as rotational speed, transverse speed and axial forces were considered. The effect of parameters on weld quality was analyzed. Hardness and tensile tests are carried out at room temperature to examine the mechanical properties of the welded joints. The joints produced with straight square tool pin profile have higher ultimate tensile strength, whereas the straight cylindrical tool pin profile results in lower tensile strength.

Biped robot with heterogeneous legs (BRHL) is a new pattern humanoid robot. This paper first introduces the conception, research purpose and configuration of HRHL. Then coordinated dynamics model and magneto-rheological (MR) damper model are given. In the end, this paper discusses the control model of BRHL and gives combined control simulation. The result indicates that intelligent bionic leg controlled by MR damper can track artificial leg’s gait well.

The demand for town houses using the constructions of lightweight conrete is growing rapidly in recent time. One of the most common building materials for cottage construction is lightweight aggregate blocks. An important role for lightweight expanded clay aggregate (LECA) concrete plays such a property as vapor permeability. This paper presents the results of vapor permeability test of the samples, the analysis and recommendations for construction of the building. These samples were taken from the LECA concrete blocks covered by unidentified cladding, of which one of the town houses was under construction in the North-West of Russia. An assumption has been made that the unidentified cladding may cause losses to the building’s wall enclosure.

Graphene is a material that has been heavily investigated in many researches due to its beneficial characteristics such as large surface area, low manufacturing cost, high electro conductivity and incredible mechanical strength. Applying the graphene in water-based solvents however can cause agglomeration due to its hydrophobic properties. Researchers have composited the graphene with other materials in overcoming its hydrophobicity. In this research, graphene was nanocomposited with thionine to make it disperse well in water-based solvents while preserving its intrinsic properties. The nanocomposition process involves mixing of both graphene oxide with thionine and were reduced by hydrazine hydrate while reflux heating. The produced mixture was then filtered to obtain the Thionine-Graphene nanocomposite. The obtained sample was then characterized to confirm the composition of both graphene and thionine. Fourier transfer infrared spectroscopy was operated to investigate the chemical bonds and hence concluding the presence of both graphene and thionine in the sample. The preservation of the intrinsic properties of graphene was also investigated through observing the absence of functionalized graphene bonds. Post-investigation reports that the chemical bonds from both of the materials, graphene and thionine were detected confirming the successfulness of the nanocomposition.

This paper discusses and analyzes the development process of economic type mechanical engraving machine, including the system overall layout, structure scheme, the movement mode of numerical control system, mechanical system design process and the design process of the control system and the "mechanical engraving" the choice of interpolation algorithm, analysis and implementation process. Compared to the same function of the CNC engraving machine, has certain advantages in terms of price, to fill the gaps in the domestic and foreign enterprises, to meet the market demand.

In this paper, the multilayer frame structure containing sheet crack was researched. Based on wavelet analysis theory, the finite element method was applied to analyze the dynamic characteristics of structural damage. Established a method about the identification of containing sheet crack frame structure by modulus maxima of wavelet coefficients to determine the location of the crack, it verifies the validity of the method through calculation analysis of damage identification to a two layers of a cross frame structure containing sheet crack. The conclusions of this paper can be used for frame structure damage diagnosis application reference.

This paper designs a multi parameter real-time water quality on-line monitoring system for aquaculture water. This system achieves the online monitoring among temperature, turbidity, DO (dissolved oxygen), pH and electrical conductivity. The crosstalk, produced by the simultaneous measurement with DO and pH sensors, will affect accuracy and stability of monitoring results. This paper analyzes the source of crosstalk, describes a circuit model of causing crosstalk, and designs an isolated circuit between powers and signals as well. The experimental results show that, the real-time monitoring of DO and pH has the characteristics of speediness, high precision, small error and low noise.

Oculomotor plant and saccade generator are the basics of the saccadic system. The purpose of this paper is mainly focused on mathematical models of horizontal eye movement system. In this respect, it is presented a model for the mechanics of horizontal eye movement. The oculomotor system is presented incorporates known physiological dynamics and musculotendon complex geometry. Developing muscle strength can be described by a two-component version of the model Hill and consists of a passive and active contractile component. The active component includes force-velocity and force-length characteristics of the muscle. Passive component accounts for elastic and viscous effects. Couple neuronal activation dynamics controls that is appropriate for judder from muscle mechanics.

Adopted the load-structure model to tunnel structure design calculation, our country often use surrounding rock pressure experience calculation formula, This paper analysed the problems existing in the experience calculation formula and calculated the surrounding rock pressure have influence on calculation results of tunnel structure internal force with the formulas, and at last given out more actual modification formula, the surrounding rock stress is continuity with the formula calculated, it is more actual than the traditional experience formula, provided a new way for accurate calculated the surrounding rock pressure.

In classic radial sampling scheme, angle intervals between adjacent straight sampling lines are the same. And so the coherence between the sampling matrix and the sparse matrix is high. Many pseudo-shadows will occur on the reconstructed image. For this problem, we put forward a novel sampling scheme in which the scan lines are placed in the manner of golden section angle interval. In the resulting sampling matrix, the scan lines scatter randomly on the whole. Experimental results demonstrate that the algorithm proposed in this paper has lower correlation coefficient between sampling matrix and sparse matrix than classic radial sampling scheme and random radial sampling scheme. Image can be accurately reconstructed by collecting less data than the other two schemes.

This paper briefly introduces the design, construction and wave attenuation effect test of a kind of floating breakwater sheltering deep water aquaculture. This novel floating breakwater structure is composed of 28 standard modules and corresponding anchoring systems, and each standard module comprises a catamaran raft and a wave-attenuating and oscillation-inhibiting device, with a length of 30 m, a width of 7 m, a depth of 2 m and a draft of 1.1 m. Each catamaran raft employs a box-shaped multi-ribbed beam-and-slab structure, and was constructed using high-performance concrete and ferrocement materials and internally filled with polystyrene foam plastics. Each wave-attenuating and oscillation-inhibiting device uses a detachable split box-shaped structure and was pre-fabricated using high-performance concrete, with a length of 2 m, a width of 1.638 m and a height of 2 m. Each standard module is anchored using 6 anchor chains, each of which has an on-floor length of about 25 m. After construction, this floating breakwater system was tested for wave attenuation effect, and the data analysis results show that the floating breakwater system has a wave attenuation effect of up to 50 %.

The location and the overall arrangement of the charging stations is an important problem with the development of electric vehicles. It is related to the charging needs, city planning, service level of charging station, geographic location and competitive ability and so on. A distribution model of EV charging station is introduced in the paper. In order to describe the model preferably, this paper introduces the attractive factor of charging stations and the area-different factor. The model can give the charging station rational positions by analyzing the data of the traffic flow and the electric-consuming-rate of cars on the road. A case study is given to illustrate the applying the model.

This paper presents a analytical method to calculate the minimum clamping force to prevent slippage between the workpiece and spherical-tipped fixture elements during milling process. After the contact deformation between the workpiece and spherical-tipped fixture element is determined, the relationships between the workpiece displacement and the contact deformations are obtained. Based on the static equilibrium equations, these equations are combined and linear equations are obtained to calculate the tangential contact forces between the workpiece and spherical-tipped fixture element. According to the maximum tangential contact force, the minimum clamping force to prevent slippage between the workpiece and spherical-tipped fixture elements is calculated. At last, this method is illustrated with a simulation example.

Focus on equipment maintenance support informationization basic requirements, this paper introduced certain ordnance equipment maintenance support system based on B/S structure , carried on preliminary discussion on design of equipment integrated support system, gave a preliminary analysis and research on design ideas, system structure and function, auxiliary module.

The servicing industry is more prosperous than others recently, how to alternate a chain store corporation to invest or operate is an important subject today. For the risk reducible and adding more opportunities to profit, the investors should collect some information (such as competition, potential...) of the industry by some rules before to join them .Therefore, it is expected to use the method of the Grey Analytic Hierarchical Process to estimate the competition about the chain store corporation for supporting investors more opportunities to profit in this paper.

On the basis of human factors analysis of driver error accidents, this paper establishes the accident-causing index system due to driver errors and puts forward the use of trapezoidal fuzzy hierarchy - the grey correlation analysis method to analyze the accident-causing index model due to driver errors. Then this paper uses related data and proposed analysis method to obtain the weights order of accident-causing factors. The results reveal the main cause of accidents due to driver errors, and provide the reference for further research to prevent the traffic accidents.

Microsoft office Excel is an important part of the Microsoft Office suite of software that can be processed, statistical analysis of various data, with its quick style and rich functionality has been generally welcomed, but with the database networking and sharing trends deepening, Excel application bottlenecks in stand-alone mode began to appear, and the network is the computer information technology in today's inevitable end, I imagine combining ADO technology developed by Delphi Excel data server in order to break this limitation, changes in non-network applications Excel mode.Excel Data Server is a set of services and client program, the server deployed on the server, the client is retrieved by the query language SQL, Excel data file can perform various operations and customer interface directly to form a Web-based application systems, customer service not only to support the application at both ends of the LAN, you can also support the application on the Internet. In this paper, Delphi7.0 support, using ADO and RemObjects SDK tools to develop an Excel data server. RemObjects referred to RO. RO version a lot, but it is recommended to use RemObjects Data Abstract 6.0.43.801, Delphi's experience in the development of it appear to be more stable, server-side and client-side data connections and programming efficiency, data manipulation more convenient.

The paper presents an experimental study on the relationship betweenprocess parametersand surface integrity of powder-metallurgy high-speed steel S390 in ultraprecision grinding. The optimal machining parametershave been obtained based on the Taguchi quality design method.The affected layerinduced by ultraprecision grinding has a uniform white layerand an inconspicuous dark layer; there are some carbides in the white layer of some samples; a compressive residual stress field exists on the ground surface. In addition, experiments confirm that lapping can remove the white layer effectively and increase the compressive residual stresses with a growth rate of 65%.The derived results satisfy the real requirements in practice.

Coal gangue is a byproduct of mining process, filling the gangue in the road embankment can reduce the pollution caused by the gangue accumulation. Because the formation and type of rock is different, the performance of gangue is different. In this paper, the main types of gangue of Handan & Xingtai coal mining area was taken laboratory test, the mechanical properties and chemical properties of different gangues were compared to determine the feasibility of gangue filling in the road embankment, and the performance law of coal gangue.

The mechanical properties of foam asphalt mixture are investigated, including indirect tensile strength (ITS), moisture resistance, rutting resistance and fatigue resistance. The test results indicate the 40°C3d curing mehod can stimulate the 30d or 60d natural environment temperature (25°C) curing procedures, which can quickly evaluate the long term ITS of foam asphalt mixture with cement or without cement. Cement can obviously improve the ITS, moisture resistance and fatigue test. The paper recommends proper cement content of foam asphalt mixture should be in between 1.5% to 2.5%.

This paper presents a numerical procedure for modelling the thermal performance of ventilated hollow core slabs (VHCS). A turbulence model suitable for this purpose is identified first by considering a smooth horizontal pipe subjected to turbulent mixed convention conditions typical of VHCSs. Comparison of the fully-developed dimensionless velocity (u+) and temperature (T+) profiles as well as the Nusselt numbers (Nu) predicted by five different turbulence models against empirical expressions available in the literature shows that the Standard and Realisable k-ε models provide the best overall predictions of u+, T+ and Nu. Since the Standard k-ε model gives slightly better estimates of the Nu values, it is adopted to model the thermal performance of a VHCS geometry for which experimental thermal responses are reported in the literature. The numerical predictions of local temperatures within the VHCS agree well with the experimental measurements, and hence the Standard k-ε model is recommended here for the modeling of VHCSs.

By analyzing the oilfield wireless monitoring system, the paper puts forward an oilfield monitoring system framework based on ZigBee wireless sensor networks on basic of studying ZigBee standard communication protocol. Software and hardware of data acquisition and transmission are designed in this system. The fast network and wireless transmission are realized.

This paper proposes an auto-focus method that is based on Ostu segment. The method uses the variance of the two classes of the segment results as the guidance of the auto-focus system. This guidance function responses to wide range of object distance range, it has a strong anti jamming ability and it provides a wide range of the guidance value. The result shows that this method can work well and the time it takes to focus is unconcerned to the position when the focus process starts and it responses to a wide range of object distance.

This paper presents the mechanical properties of a lightweight geopolymer concrete synthesized by the alkali-activation of a fly ash source (FA) produced by mixing a paste of geopolymer with foam produced by using NCT Foam Generator. Two curing conditions are used, curing at room temperature and curing in an oven with a constant temperature which is 60 oC. Bulk density showed that fly ash-based geopolymer lightweight concrete is light with the density of 1225 kg/m3 - 1667 kg/m3 with an acceptable compressive strength of 17.60 MPa for the density of 1667 kg/m3.

In this paper, a wavelet-based pipeline inspection method was illustrated experimentally. Piezoelectric ceramic (PZT5), as sensors, was used to generate and receive the guided wave signal. To be specific, a piezoelectric ring was an excitation sensor in order to generate L(0,2) mode guided wave and 16 evenly distributed piezoelectric patches in pipe circle were the reception sensors. A transverse artificial notch in the pipe wall could be detected successfully by the guided wave. For reducing the noise from the testing signal, a wavelet-based denoise technique was proposed Based on the denoised signal, both location and size of the defect could be identified. The result shows that the crack size identification was in good agreement with the theoretical prediction.

In this paper, microwave-surfactant assisted extraction of saponin from Momordica Charantia.L was studied. The content of saponin was determined by the method of vanillin-acetic acid and perchloric which were used as developer. Four main factors including extraction powder, extraction time, ratio of solid to liquid and surfactant concentration were studied by orthogonal experiments. Results showed that extraction powder was the most significant influential factor, followed by extraction time and ratio of solid to liquid. Surfactant concentration showed the minimum influence. The optimum extraction conditions were: extraction powder 400W, extraction time 5min, ratio of solid to liquid 1:12g/mL and surfactant concentration 0.03mol/L, under which the extraction yield of saponin reached 4.69%.

Reverse engineering is an important tool to generate CAD models. This paper describes an integrated approach for modeling parts from point cloud to surfaces or solids based on features and constraints. The approach allows designers to integrate reverse engineering and feature-based CAD system in the reconstruction of parts. This approach has two advantages over current practice and the reconstructed models produced by this method are feature-based and constraints satisfaction, which provides a higher level description of part geometry rather than the tedious low-level editing of geometric descriptions as in reverse engineering. This method also facilitates modification and innovative design to the reconstructed parts, which would be extremely difficult or impossible to accomplish if current reverse engineering method is applied. In addition, it is a more convenient and practical way for designers. To illustrate the validation of this integrated modeling approach, a more complicated example is illustrated based on the approach.

Based on the analysis of 30 provinces ( except Tibet) in China , this paper used the environmental staffs' number, completed industrial pollution abatement investment amount, waste treatment facilities’ number, the three wastes’ comprehensive utilization output value, and harmless waste treatment capacity as input and output index. The paper evaluated the 30 provinces’ environmental management efficiency (except Tibet) in 2008 and 2009 by Data Envelopment Analysis, then analyzed the time series data of the 30 provinces from 2003 to 2009 by Malmquist index. Study finds that overall Chinese environmental management efficiency’s TFP index is 0.942 in 2009, and decreasing year by year. Besides, it shows that technology is dominant factor of restricting Chinese environmental management efficiency, So, we should increase the investment in science and technology as to improve the efficiency. In addition, the environmental management scale’ expansion and structure optimization are also necessary methods of improving the efficiency.

Considering the contacts between solid and fluid are subjected to dynamic lodes, the influence of vibration characteristic of structure which is coupled with solid and fluid are applied to calculation. In this paper, the calculation formula of structure vibration between solid mass and fluid is derived and the finite element method (FEM) is adopted for discrete of pump station structure and fluid, considering the effect of fluid flow to solid structure, the natural frequency of pump station is acquired. The result shows the method is correct and reasonable.

This paper presents a novel photovoltaic (PV) model for a commercial PV module, which is augmented with an energy balance equation to simultaneously describe cell temperature and PV electricity output characteristics. Having the thermal and electrical characteristics of commercial PV module available from the manufacturer datasheet, the proposed PV model is implemented on the Simulink environment and verified under the standard test condition (STC) and nominal operating cell temperature (NOCT) condition. The NOCT verification with a commercial PV module datasheet is first addressed. Through experimental measurement of a commercial PV module in real operation from June 1 to August 31, 2011, the proposed model demonstrates the good estimation performance of both cell temperatures and output electricity characteristics. Comparing with ones of the other methods, the predicted output characteristics of the proposed model have a better agreement with the measured ones of an operating PV module.

Highway bridges played an important role in lifeline systems. Their seismic damage status made a direct influence on the implement plan of the earthquake relief work and the life and property security of the people. Therefore, accurate assessment and prediction for the seismic damage of highway bridges were of vital significance, based on which reasonable earthquake fortification could be implemented. This paper summarized and classified the existing seismic damage assessment methods for highway bridges, including certain index evaluation methods based on statistical results, vulnerability index evaluation methods based on probability theory and vulnerability index evaluation methods based on aggregation model. Then the capacity-spectrum method which could be used for calculating the fragility curve and the seismic assessment model of highway bridges used in HAZUS were specially explained. At last, the proposal for the development of seismic assessment systems related with highway bridges in China was put forward. Considering HAZUS’s good performance in seismic assessment, a similar assessment system should be built in China as soon as possible. The first step should be classifying highway bridges in China based on their current situation and obtaining their seismic assessment model parameters roughly, which tend to be safe. The second step should be carrying out sufficient experiments and numerical analysis and revising the model parameters obtained in the first step.

The Propeller Boss Cap Fins (PBCF) is often used to ordinary propeller, a good energy-saving effect being obtained. In order to study the energy-saving mechanism of ducted propeller with PBCF, in this paper, the FLUENT has been taken to simulate the distribution of thrust coefficient, torque coefficient, blade pressure and velocity vector of hub surface at different advance coefficients. By contrasting the results of numerical simulation of hydrodynamic performance of ducted propeller between with fins and without fins, we know that at the low advance coefficient, the ducted propeller with fins will increase the thrust coefficient and decrease the torque coefficient; rising the open water propeller efficiency, improving the efficiency under the premise of the efficiency increase by duct. The existence of fins has changed velocity distribution of water around the hub and made the water that flowed around the propeller hub with propeller rotation direction flow to propeller tail along the fins not gather in the cub, so it weakened the hub vortex.

The function of large sports facilities is complex as the space center of people assembling and the comprehensive displaying of city image and vitality, the importance is undoubted for the design of large sports facilities in fire prevention and safe evacuation. This paper puts forward the design process of fire prevention and evacuation and the method for reasonable division of fire partition. According to the special requirements of large space evacuation, the new idea of safety exit borrowing and setting the inner ring road is introduced, the design of building fire protection and smoke control area to open space is studied as the main characteristics of the large sports facilities.

The firing accuracy of trajectory correction rocket improves significantly after conducting trajectory correction. A trajectory correction rocket repetitious damage effectiveness model was proposed in this paper based on the original rocket damage effectiveness model, difference of repetitious damage effectiveness caused by the improvement of a certain type trajectory correction rocket was researched. Research conclusions have reference value for the determination of trajectory correction rocket accuracy index design, the actual operational use and operational effectiveness evaluation.

Optical ring networks have been widely implemented as the major metro network architectures. However, as the network coverage expands, the system performance of the single ring structure degrades significantly. In this paper, we propose an interconnected ring topology to enhance the network throughput and efficiency. The carried out simulation results have revealed the superiority of employing such an interconnected architecture. We also discuss the increased complexities and fairness issues induced by such design.

The paper presents the general structure and the feedback control method of a compact type of driving simulator, having a mobile suspended seat actuated by pneumatic muscles. The completed simulator is intended to be used as an advertising demonstrator for the university and also for various research projects. In order to better observe the viability and behavior of the proposed feedback structure, a scaled model is constructed using similar pneumatic muscle actuation of a 3+1 DOF suspended mass. For analysis purposes, multi-step pressure and tri-state muscle contraction control is employed. The feedback data is exchanged between the software simulator and the motion control PLC by using a custom software application.

With the continuous advancement of processor manufacturing process as well as the exposed limitations of single-core Processors, Multi-Processor System-on-Chip (MPSoC) has become the inevitable outcome of the technological development and practical application needs. It is used to meet the requirements of multitasking, multifunctional and high performance computing. With the improvement of chip complexity, verification module also increases exponentially. Verification of MPSoC is becoming Bottleneck in the process of chip’s design. So this paper first introduces the origin of MPSoC, and analyzes developing tendency of its verification. And then, the theory and main challenges to the formal verification of MPSoC are discussed. This paper will provide support for building the verified theory method and technology that can meet the demand of MPSoC design, and Developing MPSoC high-level architecture design verification technology.

This paper investigated the effect of fly-ash on environmental sustainability and engineering performance of mortar. Samples of mortar were prepared with different dosage of superplasticizer to gives three ranges of workability that is normal slump flow, high slump flow and self-compacting flow. Cement content of 550 kg/m³, water/binder ratio of 0.35, binder/cement ratio of 2.00 and fly ash replacement 10%,20%, 40%, and 60% were adopted for the mix proportion.The relationship to look into are the potential of CO2 reduction in the mortar mixes while cement content were replace by fly ash. Results showed that self-compacting mixes with 20 % replacement by fly ash provides an increase in 28 day strength, enhancing the durability with low % of water absorption and reducing the environmental impact with low CO2 footprint. This gives it the best balance of durability and environmental sustainability impact of the mixes.

The thick wall pipes have been widely used in the field of petrochemical industry, nuclear power, weapons and special equipment. In this paper, the propagation characteristics of circumferential Lamb wave in thick wall pipe and the interaction law with radial cracks were studied. A large number of simulation were carried out by using the commercial finite element software ABAQUS. The propagation characteristics of circumferential Lamb wave in thick wall pipe were analyzed. The research results show that the propagation process of Lamb wave in thick wall pipes are totally different from with that in the thin wall pipes, the energy distribution in the wall thickness direction are changing constantly. It is hard to evaluate the depth of smaller defects. The influence of various factors on acoustic field distribution should be considered synthetically in the practical inspection, such as the size of crystal, the angle of wedge, the excited signal. So detection sensitivity of the small defects can be improved.

Based on the analysis of the development, defects and motion of present hydraulic system vibrating table, it is divided into several single disciplinary system modes which are organic related in this paper. Establishing unified digital model in integrated simulation environment through analyzing the function of these models, which will guide the design of digital vibration table system.

Cooperative innovation is an important way to improve an enterprise’s independent innovation ability. In this paper, an efficiency evaluation index system of cooperative innovation is set up for China’s manufacturing firstly, then a Data Envelopment Analysis (DEA) clustering model is proposed to classify the cooperative innovation efficiency of each manufacturing industries by pure technical efficiency and scale efficiency separately, finally an empirical study on China’s 28 manufacturing industries is done. Results show that most of China’s manufacturing industries have lower cooperative innovation efficiencies, the lower utilization of science and technology funds at internal payment and industry-university-institute external cooperative payment, and the insufficiency of patent application are the reasons for the lower efficiency in cooperative innovation. Lastly, some suggestions are presented to enterprises, cooperative members and the government for increasing cooperative innovation efficiencies of China’s manufacturing industries.

Simulated annealing algorithm is a mathematic model, which imitates the physical process of annealing. And optical thin film is widely used in many industry, To perform the functions for which they were designed, the films must have proper thickness, roughness and other characteristics. In the paper, the simulated annealing algorithm is used to determine the film optical constant It uses the transmission data through thin film over a range of wavelengths to calculate the thickness. According to the experimental results, the solution found by simulated annealing algorithm is unique and correct.

Tibetan-Chinese named entity extraction is the foundation of cross language information processing, and provides a basis for machine translation and cross language information retrieval research. In this paper, we use the multi-language links of Wikipedia to obtain Tibetan-Chinese comparable corpus, and combine sentence length, word matching and entity boundary words together to get parallel sentence. Then we extract Tibetan-Chinese named entity from the comparable corpus in three ways: (1) Extracting Natural labeling information. (2) Acquiring the links of Tibetan entries and Chinese entries. (3) Using sequence intersection method, which includes the sentence representation, Chinese named entity recognition and corresponding Tibetan sentences intersection. Finally, the results show the extraction method based on comparable corpus is effective.

The subsea connector for manifolds is working in bad conditions. The water environment is harsh. And the inner pressure of the jumper which is connected by the subsea connector is high. In this paper, a new design of metal gasket for the connector is proposed. The metal gasket develops a surface contact with the upper and lower hubs. Under the effect of internal pressure, the seal ring will expand outward to ensure good seal performance. The design has a simple structure, and is easy to manufacture and disassemble .This paper uses the finite element analysis to investigate the gasket’s performance in different working conditions, and provides reference for real tests and the engineering application.

Parameterized model of combine harvester frame is created using the DM module of ANSYS Workbench in this paper. Analysis on the strength and stiffness of the frame is implemented to estimate its safety and economy. According to the analysis result, optimization is made to save material appropriately. Modal analysis of the frame is proceeded to study its natural frequency and compare it with external excitation frequency.

The locality sensitive k-means clustering method has been presented recently. Although this approach can improve the clustering accuracies, it often gains the unstable clustering results because some random samples are employed for the initial centers. In this paper, an initialization method based on the core clusters is used for the locality sensitive k-means clustering. The core clusters can be formed by constructing the σ-neighborhood graph and their centers are regarded as the initial centers of the locality sensitive k-means clustering. To investigate the effectiveness of our approach, several experiments are done on three datasets. Experimental results show that our proposed method can improve the clustering performance compared to the previous locality sensitive k-means clustering.

In this paper, vehicle systems and track-tunnel system are regarded as an interactional, mutual coupling overall system and the interaction between wheel and rail is regarded as the “ligament” of these two subsystems. The vehicle vibration model and vibration equation are established by considering the body vertical vibration, a suspension of vertical vibration and wheelset vertical vibration. By the displacement compatibility condition of the vehicle and track, integrating the vehicle equations and discretized track-tunnel vibration equation, the dynamic coupling model and the equations that reflect the vehicle-track systematicness is constituted. It provides a reference for the further research of the dynamic analysis of vehicle-tunnel coupled system.

Microcontroller Arduino Mega and ATmega is a computer chip that needed and developed to control system or process. Microcontroller Arduino Mega and ATmega can be used to temperature control systems [1][2][3], the room lighting control, security control, the hazard warning [4], scheduling, monitoring water flow and dams actuator door and etc. Most studies on the microcontroller is focused on the functional capability of a microcontroller to read or measure the object. In addition to aspects of good function, microcontroller must have a high sensitivity in order to avoid delay or in-accuracies in the sensor reading measured object such as temperature. Microcontrollers has some advantages and disadvantages of the process accuracy depends on the processor and the ability microcontroller. In this paper focuses on the measurement errors that occur on microcontroller Arduino Mega and ATmega 8535 with a temperature sensor LM 35 and hygrometer digitizes dt05 for the application process cooling and heating sea water controls. The volume of sea water is measured is 3 to 35 litters with a temperature set point 28°C of lower temperatures above 25°C and 31°C. The results show that the maximum error obtained by using microcontroller Arduino Mega is 1,32°C or 13,2 mV and ATmega 8535 is 0,2°C or 2 mV. Also the microcontroller Arduino Mega is more suitable for control temperature measurement in the process of heating and cooling sea water.

This paper completed a reinforced test of eight aging damaged old wooden beams of CFRP, studied the different layers of the CFRP reinforced rectangular failure pattern of the old wooden beams, the bending bearing capacity, load-deflection curve. The results show that reinforced aging old wooden beam repaired with CFRP not only improve the flexural bearing capacity and its failure mode changed from brittle tensile damage to compression of ductile damage.

In the present paper we introduce an approach to implementing parallel metaheuristic optimization frameworks which is used in the design of the framework HeO. This experimental cross-platform framework is a collection of popular optimization methods implemented in C++ as algorithmic skeletons. The key feature of the discussed approach is the wide usage of metaprogramming and design patterns which allow to increase the reusability of the code and ease the process of hybrid algorithms construction for the end-user. We consider framework structure and implementation details and provide the results of numerical experiments for some well-known optimization problems.