Search

Al2O3-Fe based metal ceramic is a functional ceramic material prepared by high temperature sintering with Al2O3 as the main component, plus iron powder (binder phase) and other additives. In this paper, the composition design of Al2O3-Fe based metal ceramic was made, and the performance of the material was tested and studied. The change of the content of iron powder also has a great influence on the compressive strength and bending strength of the Al2O3 metal ceramic. Experiments also show that the Al2O3-Fe-based cermet has good corrosion resistance. Finally, the following conclusions were obtained through the comprehensive analysis: the best test formula is No.4 sample, and its compressive strength is 79.79MPa, bending strength is 15.90 MPa, corrosion resistance rate is 0.028 g/dm2·h.

The paper implements a dynamic system for multi-angle glass-free 3D video, the technology for playing content acquisition have higher requirements. The system using the camera matrix, gathering content for multi-angle shooting, and then after decoding, correction, synthesis, processing changes have sustained multiple angles of video images, in order to achieve the Glass-Free 3D viewing . System uses Java to achieve the driver. As the experimental results shows that the camera capturing problems like distortion and image alignment are solved and the dynamic full HD video with four view angles realized.

ZOOM FFT technology is widely used in signal processing and modal analysis, it can improve frequency resolution, and amplify the characteristic curve in selected regions, makes the frequency characteristic of the system more clearly shown. ZOOM FFT technology based on analytic signal and band-pass filter has greatly improved than traditional methods, provides a new way to virtual instrument based on computer platform. This article discusses the application of Matlab to achieve the ZOOM FFT.

The Scramjet performance of air-breathing hypersonic vehicle is highly correlated with flight height, Mach and angle of attack (AOA). The violent disturbance of the AOA can cause the engine power off. Consequently the maneuverability of hypersonic vehicle is strictly limited in the phase of cruise. A composite Control system for an air-breathing hypersonic vehicle is presented. The hypersonic vehicle has a configuration with tail control rudders and a set of deflectable wings installed nearby the center of gravity. During the phase of cruise, the precision of AOA is achieved by deflecting tail rudders, and the maneuverable acceleration command is tracked by deflecting wings. A linear quadratic (LQ) track control algorithm with integrator is used to design the composite control system. Simulation results demonstrate that the composite control system has good performance in tracking AOA and acceleration command by respective deflection in cruise.

The ethanol concentration, solid-to-solvent ratio, extraction temperature and extraction time were optimized by using orthogonal array design, an ultrasonic-assisted extraction (UAE) method was formed for extracting total flavonoids from Cassia Seeds. The optimal conditions for total flavonoids preparation were found to be extracted at 55 °C for 40 min with 75% (v/v) ethanol and a solid-to-liquid ratio of 1:30 (g/mL). The UAE was proven more efficient than the conventional extraction (CE) technique, which could be considered a time-saving method. Therefore, the UAE could be a promising candidate for extracting phenolic phytochemicals from natural plants.

This paper proposes a new algorithms for compression of digital images especially at the encoding stage of compressive sensing. The research consider the fact that a certain region of a given imagery is more important in most applications. The first algorithm proposed for the encoding stage of Compressive Sensing (CS) exploits the known structure of transform image coefficients. The proposed algorithm makes use of the unequal error protection (UEP) principle, which is widely used in the area of error control coding. The second algorithm which exploits the UEP principle to recover the more important part of an image with more quality while the rest part of the image is not significantly degraded. The proposed algorithm shown to be successful in digital image compression where images are represented in the spatial and transform domains. This new algorithm were recommended for use in image compression.

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. The oscillation may be periods such as the motion of a pendulum or random such as the movement of tire on a gravel road. Vibration causes waste of energy and creates unwanted sound-noise. Monitoring such process generally possess a big problem especially for a system. The present traditional single resolution techniques could not solve this problem, coupled with the Fourier transform which seems to be one of the best method in analyzing and monitoring vibration in machineries or machinery components.This paper present a new algorithm using wavelet- packet based feature in classification of vibration signals. This study explores the feasibility of the wavelet packet transform as a tool in search for features that may be used in the detection and classification of machinery vibration signals. By formulating a systematic method of determining wavelet packet based features that exploit class specific differences among interested signals, which avoid human interaction. This new algorithm provide more effective method to achieve robust classification than traditional single resolution techniques. The new algorithm in wavelet transform techniques proved to be more efficient, better analysis, and provides better results with minimum error than any existing method.

An efficient facial representation is a crucial step for successful and effective performance of cognitive tasks such as object recognition, fixation, facial recognition system, etc. This paper demonstrates the use of Gabor wavelets transform for efficient facial representation and recognition. Facial recognition is influenced by several factors such as shape, reflectance, pose, occlusion and illumination which make it even more difficult. Gabor wavelet transform is used for facial features vector construction due to its powerful representation of the behavior of receptive fields in human visual system (HVS). The method is based on selecting peaks (high-energized points) of the Gabor wavelet responses as feature points. This paper work introduces the use of Gabor wavelets transform for efficient facial representation and recognition. Compare to predefined graph nodes of elastic graph matching, the approach used in this paper has better representative capability for Gabor wavelets transform. The feature points are automatically extracted using the local characteristics of each individual face in order to decrease the effect of occluded features. Based on the experiment, the proposed method performs better compared to the graph matching and eigenface based methods. The feature points are automatically extracted using the local characteristics of each individual face in order to decrease the effect of occluded features. The proposed system is validated using four different face databases of ORL, FERRET, Purdue and Stirling database.

The aim of this paper is to investigate FGD gypsum quality from coal-fired power plants and its comprehensive utilization. FGD gypsum comprehensive utilization technologies mainly include employed in the wallboard manufacture, as cement retarders, as a construction material for roads and as a soil ameliorant. In China, FGD gypsum is mainly utilized to produce wallboard and as cement retarders. FGD gypsum comprehensive utilization technical route was proposed based on FGD gypsum produce, storage, transport and comprehensive utilization. In order to ensure FGD gypsum quality so that it can be well utilized, the following requirements should be satisfied: for FGD gypsum, moisture content (wet basis) should be no more than 10%; CaSO4·2H2O content should be no less than 90%; CaSO4·1/2H2O content should be no more than 0.5%; pH should be controlled between 5 and 9; Cl- content (dry basis) should be no more than 200 mg/kg.

Cu-14Fe and Cu-17Fe alloys were produced by casting and processed into in situ composites by hot and cold deformation, and intermediate heat treatment. The microstructures were investigated by using a scanning electron microscope and an optical microscope. The electrical conductivity was evaluated by using a digital micro-ohmmeter. The tensile strength was measured by using an electronic tensile-testing machine. The results show that there are similar cast and deformation microstructures in Cu-14Fe and Cu-17Fe. The tensile strength of deformation-processed Cu-17Fe in situ composite is much higher than that of Cu-14Fe, while the conductivity of deformation-processed Cu-17Fe in situ composite is slightly lower than that of Cu-14Fe at the same cold deformation strain. The Cu-17Fe in situ composite produced by using proper thermo-mechanical processing possesses a good combination of tensile strength and electrical conductivity.

The friction and wear characteristics of different cemented carbides YG6 with Ti6Al4V alloys in different loads and speeds are revealed by pin-on-disc rotation, and analyses the wear mechanism, when the system is designed with the tribology theory to guide the development of titanium machining tool material and rational use.

Black soybean peptides (BSPs) with potent antioxidant activity were purified from black soybean protein hydrolysates (BSH) by using the ultrafiltration (UF) and macroporous adsorption resin (MAR), andin vivoantioxidant activity of the fraction BSP-DA-c was evaluated in aging mice induced byD-galactose. The results showed that orally administration of BSP-DA-c fraction at the dose of 500 and 1000 mg/kg per day could remarkably increase (PP

The prognostics and health management system of next generation turbofan aero-engine is researched for better adapting military mission needs. The system canonical structure is designed on the basis of GE company open structure. Additionally, the gas path PHM architecture is especially analyzed, and the key technologies in the system are introduced. It gets the technology ways for the realization of the system development. And the work can provide support for the development of the PHM system from the top course structure view.

Nowadays, face recognition has the rapid development with more in-depth study and more achievements. Many achievements have been applied in different fields which improves that the study of face recognition is valuable and meaningful. In this paper, a face recognition system based on the video stream is implemented. And the face recognition system consists of the following modules: face adding module, face recognition module, information querying module and global settings module. Among the all modules, face recognition modules is the core of the whole system in which completes the most of the work of the whole system. In practice, the results of the system are valuable and the system is able to meet the requirements of some applications.

The maleic anhydride-grafted ethylene-octene copolymer (POE-g-MAH) and 2, 3-epoxy propoxy propyltrimethoxysilicane (KH-560) modified nano-silica particles/ POE nanocomposites were fabricated by solution coprecipitation. Tribological behaviors of these nanocomposites were investigated using a pin-on-disk friction and wear tester under dry friction condition, and worn surfaces were studied by scan electron microscope (SEM) and color 3D laser scanning microscope, respectively. The results indicated that the addition of the low inclusion (more than 10 wt%) of nano-silica particles could improve the reducing-friction and anti-wear abilities of the POE matrix composites, and modified nano-silica as the filler are superior to nano-silica in terms of the ability of decreasing friction coefficient and wear rate of the POE polymer materials. In both cases, appropriate treatments could effectively improve the mechanical and tribological properties of the POE matrix composites due to the enhanced nanosilicas-matrix interfacial bonding.

The aim of this work was to isolate and identify antioxidant peptides from black soybean protein hydrolysates (BSH) by using the ultrafiltration (UF) and macroporous adsorption resin (MAR), and the fraction BSP-DA-c performed high antioxidant activity was further purified using consecutive methods on Sephadex G-25 column and reversed phase high-performance liquid chromatography (RH-HPLC). Two highly purified antioxidant peptides SBP3 and BSPb were got, and their amino acid sequences were confirmed as Trp-Asn-Pro and Tyr-Asn-Ile by automated Edman degradation with a protein sequencer, respectively.

In order to efficient tap the potential value in Chinese PDF documents and use Chinese PDF documents, an unique idea that extracting images from Chinese PDF documents is proposed in this paper. The idea combines PDFs document structure and page tree to extract images. Based on this idea, the experiments in this paper are done with one hundred Chinese PDF documents. And the extraction rate of the experiments obtains 83.56 percent. According to the analysis of experimental results, it is proved that the idea proposed in this paper is applicable to most of Chinese PDF documents and it is able to meet most of the needs of practical application.

A fast and effective method was developed for sequence determination of Cd and Pb in honey by incomplete digestion-high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS). Cd and Pb in some honey samples using incomplete digestion treatment were measured by HR-CS GFAAS. The factors influencing determination were investigated by single factor experimental design. The optimal determination conditions were found as follows: NH4H2PO4(10mg/mL) were added as a chemical modifier with the volume of 5μL; pyrolysis temperature 600°C(Cd) and 800°C(Pb); atomization temperature 1100°C(Cd) and 1400°C(Pb). Detection limits (3σ,n=12) were found to be 0.06 μg/L and 0.78 μg/L for Cd and Pb, respectively. The precisions (RSD) for 6 replicate measurements of Cd and Pb in honeys were 3.8% and 2.6%, respectively. Recoveries of added Cd and Pb were varied from 95% to 103%. Therefore, the proposed method was rapid, accurate and stable with a high practical value. It provided scientific basis for multi-element sequence determination in food.

Recently, as the development of thermoplastic resin with excellent property and forming process of thermoplastic resin composite material, research of thermoplastic resin becomes a hot issue in related areas. Comparing with common composite material, thermoplastic resin composite material has many advantages, such as, excellent impacting resistance and many processes. So, more and more researchers focus in thermoplastic resin composite material. In this article, applications of carbon fiber strengthen thermoplastic resin composite materials are comprehensive.

Using screw injecting molding method to prepare the short fiber strengthening thermo plastic resin composite material, using short carbon fiber as strengthening material and polytene resin as matrix. Study different influence of carbon fiber content to the hardness of short fiber strengthening thermo plastic resin composite material. The result shows that the hardness of short carbon fiber strengthening thermo resin composite material increase as increasing the short carbon fiber content.

In the process of micro-cutting for the precision small parts, one of the main problems is the micro burrs. The finite element software Abaqus was used to simulate the micro-cutting process of aluminum 2024-T3. To create this model, Johnson-Cook (J-C) model was used to establish the material model, and Arbitrary Lagrangian Eulerian (ALE) method was used to separate the chip from work-piece. The contact friction models which was used between chip and tool was the modified Coulomb friction law. The formation process of micro burrs was simulated dynamically, and the effect of different cutting parameters and tool geometry parameters on burrs forming was analyzed. Furthermore, the general law was obtained. The results provide the guidance for optimizing the tool geometry parameters and cutting parameters to reduce the burrs in micro-cutting with the high surface quality.

Localization of sensors is one key technique in wireless sensor networks (WSN).Because the midnormal-based localization algorithm (MBLA) has shortcomings such as low accuracy, relatively large number of iterations, a localization algorithm based on permutation and combination midnormal (PACMLA) for WSN is proposed. Nodes are divided into anchor nodes and unknown nodes. In its own communication range, unknown node can communicate with anchor nodes. In PACMLA algorithm, the unknown node communicates with the anchor nodes in turn, and collects their coordinate information and RSSI value. Then by comparing the RSSI values received by unknown node, these RSSI values are formed an array in accordance with the order from small to large. Then starting from the first value of the RSSI array, each of these values and the value behind them will be combined into data sets. Finally, according to corresponding coordinate information of the RSSI value in the data sets, we will determine the position of the unknown node by Point In Which Side (PIWS) determination. In addition, our algorithm is a kind of Range-free algorithm, and it can cuts down the node energy cost. The experiment results illustrate that the PACMLA algorithm has lower error and higher accuracy.

In this paper, the semi-physical simulation technology is introduced with the design and implementation of a semi-physical simulation test bench. A certain low-speed marine diesel engine of high pressure common rail (HPCR) electronic control system is taken as the subject of the test bench. In order to retain the functional and structural features of the HPCR electronic control system, the essential components are in consistent with the target engine, and some auxiliary parts are simplified and reformed. Specially, a real-time simulation model is built based on the principles of Mean Value Engine Model and cylinder moving method, which captures the requirements of ECU, such as the crank angle, the exhaust valve stroke signal, the scavenging pressure and so on. Therefore a closed-loop control system is accomplished including a real-time controller deployed in the simulation model, ECU and the executing agency of HPCR system. Additionally a monitoring management system is developed for the test bench with the functions of acquiring signals, monitoring parameters, storing data, alarming and etc. Finally, some tests are finished in the test bench and through analyzing the experimental results, the test bench can perform the characteristics and functions of the HPCR electronic control system. The semi-physical simulation technology can be used for the functional verification and performance test of HPCR electronic control system for the low-speed marine diesel engine.

The soft surface of birds and aquatic organisms in the nature can effectively reduce the drag. Inspired by the fact in this paper, an attempt is made to stick silicone rubber soft surface on the surfaces of NACA 4412 and NACA 6409 airfoils. The drags, lifts and lift-drag ratios of airfoils with soft and rigid surfaces in 5 different thickness were compared through wind tunnel test under the condition of = 0 . The results show that most of the bionic soft surfaces play the role of reducing the aerodynamic drag, and also increasing the lift at the same time, in which the soft surface of 0.6mm had the most significant effect of drag reduction and lift increasing. (2014) Trans Tech Publications, Switzerland.

The pits is a typical biomimetic surface morphology, typically it is beneficial to reduce the flow drag on the wall surface. In this paper, a method combining theoretical analysis and numerical simulation is adopted, it carries out a flow and stress analysis on the wall surface distributed by 3mm-diameter pits with typical bionic surface morphology, reveals the forms down stream flow field and the pit internal as well as the distribution of stress, it also analyzes the relationship between the viscous drag of the pit wall surface, the pressure drag and the flow drag, comparing the size of the downstream shear stress of the smooth wall and wall surface distributed with pits, investigates the mechanism of the downstream shear stress decreases on the biomimetic pit wall surface.

In order to solve the problem that the management of water-supply operation is still backward and the phenomenon of water resources wasting is exceedingly serious, this paper introduce some advanced technologies such as computer, frequency transformer, programmable logical controller (PLC) and so on into water-supply network, the constant pressure water supply system is devised to achieve the variable-frequency speed control by making use of the electric controlling system composed of S7-200PLC, MM440 frequency transformer, miniature circuit breaker, AC contactor, thermal relay, DC power supply, miniature electro-magnetic relay, sorts of indicator lights and host command devices.

The reliability theory based analysis is more advanced and reasonable compared with the traditional methods for slope stability analysis. Limit equilibrium method is usually used to evaluate the stability of a slope. In this paper, a new reliability analysis method is obtained based on JC method and multi sliding surface method which a new limit equilibrium method developed by Huang. Then, this new method is applied for a wharf slope. The sliding surface get from the safety factor is not the same as that from reliability index though they are close to each other. The safety factor or reliability index get from Fellenius method is smaller than that from other method. The safety factor or reliability index get from multi sliding surface method is close to that from Bishops method. The reliability index can be more reasonable after the standard deviation of the soil property index is deduced with random field theory.

The paper research building energy-saving technologies, in particular, phase change materials and traditional building materials combined into a new building material with a heat storage and heat. It has the energy density and the approximate constant temperature exothermic absorption, etc., can effectively maintain the comfort of the environment and reduce building heating and cooling energy consumption and costs. By collecting and analyzing the data in the the Model room temperature under infrared lamp irradiation, found that compared with the model of the phase change material without adding room, both the peak temperature of the maximum differential is 1.70 °C, the energy-saving efficiency up to 27.56%, with good energy savings.

In view of the grid has a large number of harmonics, serious interference power quality, but the existing harmonic detection has many disadvantages, this paper uses genetic algorithm to optimize the BP neural network (GA-BP),Combined with fanaticism, independent component technique in the separation technology, achieve rapid separation and accurate fitting for harmonic reduction. The method to solve the problem of slow convergence speed of BP neural network and easier to fall into local optimal solution; Separation, independent component analysis in the signal could not accurate reduction the source signal. In this paper a signal containing harmonic component are simulated. Results show that GA-BP neural network optimization independent component analysis has convergence speed, high precision, compared with the single BP neural network and the independent component analysis of the superiority.

In order to build an efficient, sample and convenient system of face recognition based on the video streaming, a mixed mode of software development is proposed in this paper. In requirement analysis of the face recognition system, efficient code, sample development and ease of use are designed in this system. To obtain better recognition efficiency, Dynamic Link Library (DLL) is used to program the part of face recognition. The whole system is based on Microsoft .NET platform which provides a simple and rapid development. The mixed of Browser/Server (B/S) and Client/Server (C/S) modes makes the system more flexible, at the same time more convenient for user to use. The whole system is divided into three parts: server, client and browser. And the server-side is storing data through a database, managing different clients and providing data to the browsers. The client-side mainly monitors and collets data. The browser-side provides users with querying information which they want. And the proposed system architecture can satisfy the application requirements for the customer.

Uniform safety factors are normally assumed in slope stability analysis and this assumption can influence the rationality of the analysis. New analysis methods were obtained based on Fellenius, Bishop and multi sliding surface method to study a failed slope of a port in southern China. The calculation results show that the safety factors of soft soil layers will be overestimated and the safety factors of hard soil layers will be underestimated if soil mass of slope vary widely in the strength. For the failed slope in this paper, the factors obtained with normal methods will be overestimated because of the hard soil layer of this slope.

Horizontal drainage cushion plays a key role in vacuum preloading projects. The traditional horizontal drainage cushion is sand blanket which consumes large amount of sand and is not enviromentally friendly. Several improvements or modifications of horizontal drainage cushion were developed in engineer practices in recent years. Drainage net was used as horizontal drainage cushion in ultra-soft soil improving projects in order to solve the laying problem of sand blanket. Sand ditch was used to deduce the consumption of sand. Direct vacuum preloading method linked the PVDs and filer tubes together in order to improving the transfer efficiency of pressure and canceled the sand blanket at the same time. Low position vacuum preloading method set horizontal drainage cushion below the surface of the ground in order to cancel the sealing membrane.

The main topic of this article is the architecture modeling data which is involved in 3D GIS. The constructing platform of modeling data is also discussed. Then, it makes comparison and analysis between these platforms. Comparing to other platforms, SketchUp has lots of advantages, such as easy to operate, good for effect, saving storage space and cross-platform. So it has been used for feature modeling in 3D-GIS area, and it can satisfy the demand of this domain. At last, combining with the practical engineering, the article discusses the modeling method using the SketchUp software. The results are desired, and the method is worth to extend.

In urban environment, the soil disturbance induced by shield tunneling can be sensitive because it can cause deformation of the ground and damage the near structure. To study this disturbance in the construction process of Tianjin metro line No.3, in-situ monitoring of pore water pressure, soil pressure and ground settlement were conducted. The pore water pressure was monitored for the soil around the tunnel. The soil pressure was monitored for the soil around the tunnel and on the tunnel face. It was revealed that the pore water pressure and soil pressure changed twice in the tunneling process and these changes were induced by cutting face and grouting at the shield tail. The soil pressure on the tunnel face reached its maximal value when the distance between the cutting face and the sensor elements was around the diameter of the tunnel. Ground settlement developed in the tunneling process. The shape of ultimate settlement trough is closed to the one obtained by Pecks method.

Conical conformal microstrip patch antenna is very important in wireless communication and microwave instrument. In this paper, a Ka-band rectangular inset-fed microstrip patch antenna which conforms to a conical surface has been designed, the specific designed method and parameters were given. Then a conical conformal microstrip antenna is simulated by CST, the difference between planar antenna and conical conformal antenna has been discussed, and the effect of surface curvature on conical conformal antenna resonant frequency of has been analyzed.

Orthogonal discrete frequency coding waveforms(DFCWs) is an ideal quasi-orthogonal waveform. This paper analyses the ambiguity function of DFCWs and the results indicate that the correlation characteristics of DFCWs have only relationship with the code length and coding order. Based on the theoretical analysis, we defined the cross-correlation energy as the cost function, and used the improved discrete particle swarmoptimization(DPSO) to optimize the order of DFCWs. The new signal can effectively restrain the cross-correlation level between the two DFCWs. Simulation results verify the effectiveness of the designed DFCWs.

To improve anti-ship missiles selection capability over the intended target of the ship formation, a method is presented to select intended target by utilizing the mutual locations and RCS information of the ship formation. Firstly, this method takes advantage of the hausdorff distance to match the optimum position of the point set which are respectively acquired by fire-control radar and terminal guidance radar. Then, the point sets common points are acquired by the bidirectional nearest neighbor rule. At last, the common points are further selected by utilizing the RCS information of the target. The composite metric distance method is presented by utilizing the targets RCS information and the formation information, and the selection probability of the intended target is analyzed. The simulation experiments show that this method is free from the influence of the dispersion error of the control end and the whole maneuver of the formation target, and its correct selection probability over the intended target is higher than the method which uses the formation information only.

The present environmental regulations in China require sludge to be disposed of in a safe and environmentally sound manner. This paper presented an investigation on methods to stabilize wastewater sludge and stability evaluation of stabilized sludge landfill. Laboratory studies were conducted to determine the feasibility of solidifying and stabilizing sludge using fly ash, lime, and clay at varied mixing ratios. Geotechnical properties of stabilized sludge were studied. The test results revealed that the strength of stabilized sludge increased with curing time and the decrease of moisture content. Significant increases in strength were achieved to math suitability for disposal in landfills and a stabilization method was selected based on cost and availability of material. The stability of landfill slope was studied and an optimum slope ratio balancing the safety and economy was presented.

In order to investigate the drag reduction mechanisms of vibration digging shovel from the kinematics and mechanical aspects, and to estimate the magnitude of its traction resistance, we performed kinematic analysis when the velocity of the digging shovel was undergoing sinusoidal changes. Based on the analysis of the relationship between vibration direction angle, ascending direction angle and the edge motion curve, we evaluated the efficacy of different mining modes and proposed the ideal working conditions. We found that when the vibration direction angle φ

Based on environmental stochastic excitation, a large scale modal test was conducted at an important section of Shanghai Metro Line 1. According to the collected time response data, the natural frequencies of the soft soil-tunnel system were obtained by means of theoretical and experimental analysis, which can provide calculation parameters for further relevant dynamic analysis.

Ultra-soft soil improvement projects are new trend in present China because of the limitation of construction period. Technical problems occur when traditional vacuum preloading method is applied for ultra-soft soil. This paper firstly gave an analysis of the main technical problems which include construction channel problems for building materials and workers, portion division problems of project area, installation problems of prefabricated vertical drains and formation problems of horizontal drainage cushion. Then solutions for these problems were presented. Based on the solutions and traditional vacuum preloading method, a new method for ultra-soft soil improving was put forward. A typical application of this new method was give at the end of this paper.

In this article, the technology of ultrasound impacting is mentioned. The toe of 16Mn welded joints are treated by the ultrasound impacting, and the fatigue, hardness and residual compressive stress of the 16Mn welded joints are compared after treated by ultrasound impacting. The results shows that, the ultrasound impacting bring high residual compressive stress on the surface of the 16Mn welded joints, besides, the treatment of ultrasound impacting can improve the fatigue and hardness of the 16Mn welded joints, and when the impacting electric current is 1.5A, and the impacting time is 10 min, the fatigue and hardness of the sample is the best.

In this paper, a set of 12 in-vessel resonant magnetic perturbation coils are designed for the J-TEXT to investigate the interactions between external resonant magnetic perturbations (RMPs) and a tokamak plasma. Since the coils will be fed with AC 10kA/10kHz and mounted inside the vacuum vessel where the pressure is E-7 Pa and the center-line field reaches 3 T, the coils design adopted and installed is a water-cooled hollow copper conductor insulated with polyamide and cured epoxy resin, and then housed inside a welded stainless steel jacket that forms a vacuum boundary. A solution of how the coils are connected to the power supply outside the vacuum in a limited space is also given in this paper. The primary challenge in the design of these coils is dressing the copper conductor with stainless steel jacket by welding without overheating the polyamide and cured epoxy resin insulator.

A CPW-fed microstrip monopole antenna which is conformal to a conical surface is presented in this paper. It has a simple structure printed on a substrate with dielectric constant of 2.55 and thickness of 0.2mm. By the aid of electromagnetic simulation software of CST Microwave Studio, the main influencing parameters of the antenna are simulated and analyzed, the difference between planar antenna and conical conformal antenna has been discussed, and the optimized physical model has been achieved. The simulated result shows the proposed CPW-fed conical conformal antenna has a broad bandwidth property that covers from 6.2 to 20GHz(VSWR 2), and it is suitable for wideband radar applications.

During deep penetration laser welding, a keyhole is formed in the molten pool. The characteristics of keyhole are related to the welding quality and stability. Analyzing the characteristic parameters of a keyhole during high power fiber laser welding is one of effective measures to control the welding quality and improve the welding stability. This paper studies a fiber laser butt-joint welding of Type 304 austenitic stainless steel plate with a high power 10 kW continuous wave fiber laser, and an infrared sensitive high-speed video camera was used to capture the dynamic images of the molten pools. A combination filtering system with a filter length of 960-990nm in front of the vision sensor was used to obtain the near infrared image and eliminate other light disturbances. The width, the area, the leftmost point, the rightmost point, the upmost point and the bottommost point of a keyhole were defined as the keyhole characteristic parameters. By using the image preprocessing method, such as median filtering, Wiener filtering, threshold segmentation and Canny edge detection methods, the characteristic parameters of a keyhole were obtained. By analyzing the change of the keyhole characteristic parameters during welding process, it was found that these parameters could reflect the quality and stability of laser welding effectively.

The 3D finite element simulation of three-roller cold rolling model for stainless steel tube was established using finite element software MSC. Marc. The metal flow rule of contact deformation zone, the distributions of equivalent stress and strain were analyzed. The experiment of cold rolling process was carried out based on the technical parameters of the simulation.

The slope stability is an important problem for the slope building on the soft clay ground. At present, the vane shear strength is common used to calculate the factor of slope stability at short term. In fact, a lot of cases show that the vane shear strength underestimates the real shear strength of the sliding surface. Therefore, based on Mohr-Coulomb theory, and using the linear relation between the vane shear strength and the depth, a method of converting in-situ vane shear strength into undrained shear strength parameter is presented. Two shear strength parameters c and φ are from statistical regression analysis. The anisotropy, the lateral compression coefficient and the average consolidation degree of the soft clay are considered. The two shear strength parameters are used to calculate the short term safety factor of the slope stability. The safety factor is greater than 1.0 for steady slope.

In urban environment, short-distance undercrossing of shield tunneling to an existent tunnel is an unloading process and can cause adverse effect on the existent tunnel. This kind of effect should be controlled. To analysis and control this effect, numerical simulation, field monitoring and optimization of construction parameter are used. To get reasonable calculation parameters for numerical models, field monitoring is conducted. The numerical simulation is utilized to study the process of short-distance undercrossing. The simulation result revealed that the deformation of the existent tunnel can be beyond the tolerable value unless some measure is adopted, but the deformation can be reduced significantly by improving the ground under the existent tunnel with cement deep mixing method. Construction measures are adopted, such as the strict controlling of synchronized grouting, secondary grouting, rotation speed of cutter head and driving speed. As a result, the deformation of the existent tunnel is controlled in the tolerable value.

In the ground source heat pump (GSHP) system, the temperature around the borehole exchangers (BHEs) would continue to spread further because of the heat accumulation, in addition the groundwater advection would have an important impact on the thermal dispersion. In order to have more accurate spacing between holes for design, the definition of temperature plume distance is proposed, based on the steady-state model with groundwater advection in porous media, the approximate analytical expression of temperature plume distance was obtained, the factors affecting the temperature plume distance was analyzed by comparing to infinite line source (ILS) model.

On the basis of the limit equilibrium method and the physical significance of Coulomb’s yield criteria, extremum conditions of yield functions is established, which will be the fundamental equations for the limit analysis of soil mass. Once the stress equation along a sliding surface is available, the normal stress on the sliding surface can be obtained, a new limit analysis method, generalized limit equilibrium method (GLEM), can be established. With the generalized limit equilibrium method, an analysis method to solve the problem of slope stability can be obtained without introducing any other assumptions or simplified conditions but the sliding surface. With this algorithm, any discretionally possible sliding surface can be trial calculated and the least value of the calculated results of different sliding surfaces is taken as the safety factor. As long as a selected sliding surface is close to the true sliding surface, the derived safety factor will be approximate to the genuine solution to a problem of slope stability.