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This paper proposed a new kind of precast hollow cross-grid floor system which is fabricated by several precast panels and post-poured concrete strips. As there is a lack of data related to the vibration serviceability of this new floor system which aim at being used in the large-span buildings, an experimental investigation was conducted. The data obtained from the experiment showed the new floor system meet existing China criteria under most pedestrian excitations. The resultsalso demonstrated thepacing rate influence the vibration performances most as the crowd effect least. Then the FEM analysis was taken to predict the peak acceleration of the new kind of floor system comparing to the experimental results using different coefficient of dynamic force.

The fatigue property of a TRIP (transformation induced plasticity) steel after resistance spot welding (RSW) is investigated. It is found that the fatigue strength of the spot weld is only 8.9% of the original TRIP800 steel. This is a result of microstructure mismatch in heat affected zone (HAZ) due to different cooling rates during RSW. A maximum variation of about 220HV microhardness is observed at different areas from the relatively narrow HAZ. The fatigue degradation is attributed to the inhomogeneous distributions of microstructure and microhardness at HAZ and its adjacent zones. The fatigue crack initiated between HAZ and BM is a cleavage fracture as confirmed by scanning electron microscopy (SEM) observation.

The hard spots are investigated in ADC12 die casting cylinder blocks for air compressors using metallographic method and a micro- hardness tester. The results show that the hard spots have two main shapes. There is a nonuniform micro-hardness distribution within a hard spot. Energy dispersive spectrometry (EDS) analysis reveals that these hard spots are some kind of mixture of oxide and carbide, which are formed during melting and die casting process.

Hexangular in-phase coherently coupled arrays of vertical cavity surface-emitting lasers (VCSELs) were fabricated using proton implantation. The arrays show excellent beam quality with far-field divergence of 4.8° and the output power of 3mW under continuous-wave condition. Different global flower-shaped patterns appeared with the varied injection currents.

The purpose of this paper is to develop a practical method which integrate the mighty function of GIS with KBS (Knowledge Based System) .It emphatically bring forward a prototype of KBGIS. The research is an example of GIS-KBS integration in which the elements of KBS techniques are actually integrated with GIS. The idea of the prototype KBGIS system design was to put the model, data, domain knowledge, and the system's knowledge acquisition and reasoning mechanism and GIS together into a same environment.

This paper first used parametric design language APDL to establish three kind of the single hyperbolic paraboloid shell model with rectangular projection. The parametric design of the reticulated shell structure could be realized after inputting the span (S),rise (F),the grid number of each side (Kn),the warping rate (K),which provided great convenience for optimizing the structure and force analysis.Then through contrasting three structure schemes and different warping rate,it studied how they influence the mechanical properties of structure.And at last it got some conclusions with engineering significance.

Control strategy under unbalanced and distorted grid voltage is one of the most significant tasks for grid-connected inverter (GCI). In order to guarantee that the grid current meets the related IEEE Std.929-2000, a new control scheme was presented. Firstly, the typical model of GCI was presented. Secondly, the GCI control model based on PI-QR controller in synchronous reference frame (SRF) was built. Finally, the system’s simulation was conducted under distorted and unbalanced grid voltage. The results demonstrate the effectiveness of the presented control strategy.

Biochar has been applied in soil amelioration due to its multiple agricultural and environmental benefits. Biochar sample (BC) and biochar-based amendment (AD) were added into a poor quality soil (light sierozem) collected from Ningxia Hui Autonomous Region at the rates of 0%, 1.5%, 3% and 5% (w/w), respectively. Maize (Zea mays) was chosen as a test plant, and the effect of BC and AD on its growth was investigated. The results indicated that the maize biomass increased by 44.4-96.2% and 113.8-187.3% in the soils amended with BC and AD, respectively. Therefore, BC and AD may be used as the poor quality soil amendments.

By using the parametric design language APDL, developed ellipsoidal reticulated shell parametric macros, only enter the long axis S1, short axis S2, high vector F, scale factor t, ring symmetric region shares Kn, radial nodes turns Nx, to generate the desired lattice shell; comparative analysis of 30 kinds of scheme through two types of single-shell ellipsoid reticulated shell with different rise span ratio force, studied its stress characteristics, providing a theoretical reference for designing and engineering ellipsoid reticulated shell application.

This paper presents a method of estimating cutting forces of the tool by taking the tool’s run out into account during micro milling processes. The thickness of uncut chip is modelled based on the trochoidal trajectory synthesized from the rotational motion, the feed motion, and the run out of rotational micro tools. The strain gradient plasticity theory is then used in conjunction with the Johnson–Cook constitutive equation to calculate flow stresses, where the influence of the plough shear on the rake face and the elastic recovery on the flank face is considered. The calculated cutting forces using the proposed method for micro milling processes show a satisfactory agreement with existing experimental results.

In order to study the residual fatigue life of 500 kv transmission tower under load conditions, a multi-scale finite element model of transmission tower is established. By simulating time course of wind load, using Miner fatigue cumulative damage theory and linear S-N curve, the calculation method of transmission towers fatigue life is established. The research shows that the multi-scale model can better simulate the stress and strain state of the transmission tower, and can predict the remaining service life of the transmission tower .The research has important significance and application value for the safe operation of the transmission lines.

In order to analyze the mechanical properties of UHVDC transmission tower joint accurately, a multi-scale finite element model of the transmission tower is established with the interface between solid element model and beam element model. The model is applied to the nonlinear analysis of a key joint in a test condition .The results show that the tower destruction is caused by buckling behavior of the cross bracing member and the multi-scale model can simulate the force state of gusset-plate and the connected members realistically, which is superior to traditional large scale models. The analysis coincides with the experiment well and provides references for the transmission tower design.

This paper presents a method of measuring the volumetric tool wear by use of the image processing technique. A single CCD camera based stereo vision system is built to acquire the image pair. The crater wear’s boundary of the cutting tool is then detected, and then the 3D volumetric shape of the worn region on the rake face is reconstructed through the developed image matching algorithms, and the crater’s volume and depth is estimated. A Matlab software system is developed to perform image acquisition, calibration, image rectification, image adjustment, stereo matching, crater’s depth estimation, and the representation of the volumetric tool wear. The feasibility of the proposed method is verified through experiments.

Using ANSYS software comes with parametric design language APDL, developed a square pyramid partial double layer of Schwedler spherical reticulated shell parametric design macro program; achieved this kind of spherical shell parametric modeling with the given shell span S, vector high F, the thickness (height) of the pyramid, ring copies of the symmetric region Kn and radial nodes laps Nx. Analyzed the static performance of the spherical reticulated shell under different structural parameters, studied the displacement of the structure and the distribution of the stress change with macroscopic geometric parameter change rule. Analysis results of eight kinds of conditions showed that the square pyramid partial double layer of Schwedler spherical reticulated shell has good mechanical performance. The result of the analysis provides a theoretical basis for the relevant engineering design.

In order to study the damage problem caused by the transmission tower fatigue cracks and bolt pretightening force loss ,this paper proposes a transmission tower damage identification method based on concurrent multi-scale model, namely establish solid model on nodes of fatigue crack and bolt looseness based on large scale model., subdividing elements size. Take a practical engineering 500kV transmission towers as an example to establish a concurrent multi-scale models. This paper simulates 8 kinds of conditions including bolt pretightening force loss and angle steel crack, research shows that the sum of wavelet packet energy curvature difference can effectively identify minute damage, and then get the function relation between damage level and damage index with no noise interference, also this provides a theoretical basis for it as actual damage monitoring indicators index.

In order to study the vibration and seismic performance of K8 triangular cone partial double layer spherical reticulated shell and analyze the factors that impact its self-vibration and seismic performance, this paper used parametric design language APDL of ANSYS to establish the shell model,then used 3D El-Centro seismic waves to analyze the influencing factors of its self-vibration and seismic performance by changing the ratio of rise to span, the ratio of thickness to span, bar section area and other parameters. Therefore this paper get some conclusions with engineering significance.

By using ANSYS software parameter of design language APDL the parametric design macro program of two types of equilateral triangle cylindrical lattice shell are given with the given parameters of the span S, the length L, the rise F, the number of lattice in the span direction the model of equilateral triangle cylindrical lattice shell would be obtain easily. Thus offer convenience for force analysis and optimization design about this structure. The force analysis of the two type equilateral triangle cylindrical lattice shell is done. By contrast with the five typical cylindrical shells, the two type equilateral triangle cylindrical lattice shell has good rigidity and strength, and has application value in practice engineering.

While “Form follows function” is a familiar tenet of 20th century architecture, originally expressed by the Bauhaus School of Design and popularized in America by Frank Lloyd Wright, today’s architectural form usually starts from pursuit of design concepts, a process of an intuitive understanding of design problems solving. The process of making concepts is often associated with the starting point of a long journey, where designers keep improving on and adding details on the concepts until concepts evolve to be innovative and operable. In a conceptual planning with a specific context, the form of the whole design, including layout, architecture and landscape, comes into being naturally according to the expression of concept.

Nowadays we advocate low carbon economy, energy conservation and emission reduction, emphasize the harmonious development of human being and the nature. As a result, the clean, efficient microgrid with flexible use mode is widely payed attention to. A microgrid uses natural resources as electric power source, it can effectively relieve burden of the grid, and help to solve the problem of transporting electricity from the grid to remote suburb area. How to design the structure of a microgrid to make it run harmoniously with the grid while using clean energy efficiently and controlling the microgrid reasonably is the key to developing microgrid technique. Based on the construction of microgrids in China, this paper concludes the main key techniques in designing and constructing of microgrid, introduces several typical microgrids in China, and makes an outlook to the designing of microgrid structure and technique development.

Base on the theory that 222Rn can transport in any medium, fast prediction model of radon concentration in environment air can be acquired. And it has been proved accurate by an experiment in laboratory. Many field tests also showed that the average absolute relative error is 8.78% between mean value of measurement and that of fast prediction. It can be predict fleetly the radon concentration by 226Ra which is acquired from the airborne gamma-ray spectra. The relative error between measurement and model is-11.7%. Therefore, the transport model can be effectively applied to predict radon concentration in environment air.

Old communities suffer increasing crime rates in China. The original environment layout can not meet the needs of living safety and needs redesign for crime prevention. The theory of Crime Prevention Through Environmental Design or CPTED is based on one simple idea that crime results partly from the opportunities presented by physical environment. It is possible to alter the physical environment so that crime is less likely to occur. This paper focuses on CPTED strategies applied to a typical Chinese community for neighborhood renewal. The physical environment problems associated with community crime and fear of crime are first identified. Four distinct ways to implement CPTED strategies are emphasized and discussed in detail individually in the research: community layout, traffic, landscaping and buildings. The paper ends with pending issues and a major lesson that CPTED must be tailored to the specific problems occurring in particular settings.

Unsymmetrical loading twin-arch tunnel which has its own characteristics is different from the general separated tunnel. This paper takes a unsymmetrical loading twin-arch tunnel as the background, supervises the tunnel and clears up and analyzes the monitoring data. The results shows: (1) The subsidence of arch crown grows with section excavation, it diminishes gradually and tends to be stable in the initial stage of support and the complete stage of inverted arch. (2) The convergence pre-day of tunnel surrounding rock increases and becomes stable until the lower inverted arch has finished in the effect of unsymmetrical loading and excavation. (3) The surface position of tunnel midline is the most significant position of excavation influence. (4) Unsymmetrical loading makes the lining and middle wall become dislocated, and cracks and peeling phenomenon appears. These conclusions can provide reference for slope design, construction process and site monitoring for unsymmetrical loading twin-arch tunnel under similar conditions.

Based on the traditional DSR Protocol has obvious drawbacks such as short network lifetime in the small reconnaissance UAV ad hoc network, a routing protocols called UEDSR(UAV Energy Dynamic Source Routing Protocol) suitable for small reconnaissance UAV ad hoc network is proposed. This protocol introduces the energy balancing mechanism into the algorithms based on DSR, then improves the situation of excessive energy consumption of hot nodes and prolongs the network lifetime. The simulation of protocol by NS2 illustrates that comparing to DSR the UEDSR protocol achieves about 7% increase in the network lifetime and the packet delivery and the average of network throughput are effectively improved.

Using the information technology appropriately will positively affect the professional development of the teachers and, in turn, the educational reform towards the direction where we hope it to go. A survey about the teacher IT ability and training needs has been carried out from 2011-2013. More than 300 primary and middle school teachers are involved in our questionnaire and interview. Most of the teachers (76.84 percent) believe the improvement of the information literacy will be of great benefit their professional development.

the paper firstly designs dynamics model of a 6-DOF vertical multi-joint robot and simplifies it, aiming at the existing algorithms PID path tracking control, the paper put forward two new algorithms based on the analysis of the variable structure control: fast variable structure control algorithm and adaptive fuzzy variable structure control algorithm. The fast variable structure control algorithm can improve the control effect by optimizing the reaching movement. By introducing adaptive processing and fuzziness into reaching law of traditional variable structure control, the reaching motion is improved during sliding mode process. The results show that the two algorithms can not only improve response rate, but also ensure the accuracy of trajectory tracking, as well as the advantages of simple structure, high robustness and adaptability.

Two biochars were prepared at 400 °C from peanut shell and Chinese medicine material residue, and their surface properties were measured by scanning electron microscopy (SEM) and electron dispersive X-ray analysis (EDX). The two biochars were mixed at a ratio of 1:1, and then was applied to an acidic soil collected from a cropland in Huangdao district of Qingdao, Shandong province, China. The results of soil incubation and pot experiments showed that biochar applications to the acidic soil (1% and 5%) increased pH value from 5.8 to 6.1 and 6.7, improved Indian mustard (Brassica juncea) seed germination rate by 10% and 15%, respectively, and the shoot and root dry weight were significantly increased by 8.3%/28.5% and 11.5%/26.9%.

To produce 130MPa reactive powder concrete with iron tailing sands as aggregation in an economic hot curing system, the effects of curing temperature, curing time and curing conditions on the reactive powder concrete was studied, the reasons of the strength of reactive powder concrete in different curing systems has the difference from the submicroscopic structure point of view was analyzed. The results show that use 90°C hot water to cure reactive powder concrete for 48h can lead it’s 28 day compressive strength reaches 140MPa, the flexural strength reaches 28MPa.

Based on the discrete mathematics model, this paper analyzes and studies the artificial intelligence virtual technology of computer and verifies the feasibility and reliability of the model through the virtual numerical experiment of computers simulation. The first part of the article describes the key of computers artificial intelligence virtual process and virtual technology and discusses the analog signal and conversion process of digital signal and the visualization process. Base on this, this paper establishes the discrete mathematical model of computers logic. This model can determine the signal and issue digital signal and control instruction. At last, this paper designs a virtual computers simulation and verifies the reliability of the model through the successful control of multi-freedom of virtual human. It also has been extended to piano playing process and concluded the time visualization chart of the pianos frequency response event which provides a technical reference for the study of vocal performance process simulation.

Ethnic harmony can make the every chord has stability within tone. It can make the chord has strong logic which has the role of continuity. Functional and tonality of harmony have important relevance. Harmony cannot play the role of harmony in the application without the tonality. The national electronic musical instrument of the system treats MIC29151 as core regulator. It controls ADC0809 sampling through AT89S52 and displays output power timely. Leakage protection device achieves the leakage protection by an instrumentation amplifier AD623, voltage comparator LM2901 and CD4013 dual D flip-flop relay switch. The system can output 5V voltage stability and precise. When rate current is 1A and input voltage is 7~25V, output voltage regulation is 0.132%. When input voltage is 5.5~7V, output voltage is 5±0.05V. When input voltage is 7V, load regulation is 0.032% which is an ideal solution for national electronic musical instrument.

When observing the WWD-0.8/10 air compressor that was noiseless and oilless, its vibration and noise were large. These phenomena were related to air compressors reciprocating inertial force and overturning moment which were separately depended on pistons acceleration and forces of connecting rod. Movement mechanisms three-dimensional solid model establishment, virtual assembly and motion simulation were accomplished by Pro/E. The main procedures were introduced in the paper. Many important metrical data obtained about pistons acceleration and forces of connecting rod by motion simulation could supply necessary references for air compressors dynamic optimizations.

With the social development of China, new energy power generation industry keeps developing with the strong support of the government. Compared with traditional coal power, new energy power generation has more advantages in environment, energy saving and so on. China's increasingly serious pressure on energy and increasing attention to energy saving and environmental pollution reduction make the economic study of new energy power generation necessary. Under the background of global financial crisis and climate change, new energy industry development has aroused general concern, which promotes the development of new energy industry and makes it a new growth point of global economy. China's new energy industry has stepped in fast developing stage, meanwhile, new energy technology keeps developing, industry scale is rapidly increasing, new energy equipment manufacturing level and industrial technology research and development level are promoting.

In order to study the carbon emission characteristics of inland ships, a carbon emission monitoring system is designed. By real-time monitoring of oil consumption and the method of tree of decision in ship discharge, it achieves the monitor of carbon emission. The recursive least square method and Wilcoxon symbols average rank test are used to improve the precision of the carbon emissions monitoring. Finally, through carbon testing experiment, it demonstrates the feasibility of the carbon emission monitoring system, and finds that the main factor affecting the accuracy of the system is carbon oxidation rate.

The influence of grain refiner on the microstructure and mechanical properties of pure aluminum was investigated by separate and combined addition trace ScZr elements. The results show that the grain refinement effect of 0.2%Zr added alone is better than that of 0.2%Sc, each of them separate addition can make the strength and hardness of alloys increased obviously, and the decrease of the ductility is not remarkable, but the hardness increase of the alloy with 0.2%Sc is more significant than 0.2%Zr because of the strongly solid solution strengthening of Sc. While, the combined addition of 0.2%Sc and 0.2%Zr possesses the most excellent grain refining effect and change the growth morphology from columnar grains to equiaxed ones, the average grain size of the alloy is dropped to only about 100μm, and the strength, plastic and hardness of the alloy meet the reasonable matching, which is largely attributed to the effectively reduce of the Al-Sc eutectic point and the formation of Al3(Sc, Zr) composite particles, These Al3(Sc, Zr) particles can not only keep all the beneficial effect of A13Sc but can act as extremely effective nucleation sites of α (Al) and cause strongly fine-grain strengthening effect.

In this paper, the influence of topography on ground-motion intensity parameter, response spectrum, peak ground acceleration (PGA) and the ratio of response spectrum were studied based on the measured data from large scale shaking table test and observation stations in XiShan park for Wenchuan earthquake. The results show that: in the EW direction, the height do not affect PGD, SMA, VSI and HI, while V_RMS decreases slightly at the middle of the slope, the other intensity parameters increase with the increase of height. In the EW direction, the height has no influence on PGD, V_RMS, SMA, SED, A_RMS, VSI and HI, while other parameters increase as the height increase. In the UD direction, the height has no influence on SMV, PGD, V_RMS, SMV, ASI, VSI and HI, while A_RMS decreases at the middle of the slope, and the other intensity parameters increase as the height increase. Ignoring the local topographic effect, the amplitude of response spectrum increases with the increase of height at the part of short period (T1s), the part of long period (T>1s) is not effected by height. The ground motion will be amplified by local canyon topography, and the influence of local topography is larger than height. The research carried out in paper will deepen the understanding of topographic effect. 0 Preface Earthquake often cause extensive rock slope failures and various types of mass movement in mountainous areas. Catastrophic seismically-induced landsides are among the Earths most powerful geomorphic events, causing sudden and dramatic changes to the landscape, creating high risks to both infrastructures and life, and reputedly causing large economic losses. Seismic waves interacting with topography lead to amplification and deamplification of resulting ground motion. In the western mountainous areas of China, the topography is extremely complex, many large hydropower stations were built in narrow valleys and many large bridge piers were built on valleys and hillsides, so the research about topographic effect is essential to the seismic design of large-scale projects. Topographic effect is always analyzed with following three approaches: motion observation, analytical analysis and numerical analysis. The motion observation is regarded as the most efficient and common approach [1]. Long time ago, the researchers found that the intensity of buildings built on local convex topography was abnormal, in order to reveal the reason of abnormal intensity, array stations were constructed specially to study the effect of local convex topography on ground motion, some observation data were obtained. Some L-7 type strong motion seismographs were installed at the crest and foot of Kagel and Josephine mountain, California, by Lawrence L. Davis and Lewis R. West, the 2 array stations had recorded several aftershocks record of SanFernando earthquake, which occurred on February 9, 1971[. Some L-7 type strong motion seismographs were also installed at the crest, hillside and foot of Butler mountain, Nevada, to record blasting vibration in test site. In 1984, in order to observe the topographic effect of rocky mountain, 8 observation stations were installed by B. E. Tucker, five stations were placed in two tunnels with different elevation, the other three were placed at the surface of outcropped rock [. After the 1989 Loma prieta earthquake, dense array stations of seven digital and triaxial seismographs were mounted on Robinwood Ridge, which is located at 7.3km northwest of epicenter, to analyze the reason of seriously damage on high-strength buildings and cracks of ground [4,. In China, a earthquake observation station was constructed in XiShan Park, ZiGong, SiChuan province in 2007, which recorded the main acceleration time history of WenChuan earthquake perfectly, the establishment of this station offers valuable data to researchers for exploring the local topographic effect on ground motion [6]. In 2010, a research was conducted by Wang Haiyun and Xie Lili with traditional spectral ratio method, some significant conclusions were drawn about the influence of topographic effect on ground motion [7]. In this paper, WenChuan seismic wave was analyzed in time and frequency domain to explore the influence of topography on ground-motion intensity parameters, response spectrum and spectrum characteristic.

The paper describes the main factors of influencing increase cropper electrolysis current density.The main circuit and the control circuit of cycle reverse rectification power for copper electrolysis are designed. The simulation and practical results show the cycle reverse electrolysis power based active disturbance rejection controller has high reliability and precision of steady current and anti-disturbance,the density of electrolysis current can be increased and anode passivation can be decreased ，the effect is better especially for high impurities of anode sheets. the energy-saving and lower costs and high quality and increase of output are achieved. this technology is practicable.

On the basis of analyzing recent years research achievement of similitude material, we adopt cement, gypsum, blanc fixe and water to perform matching experiment. Orthogonal test has been used in this experiment. From the calculating data, it can be received that density, elasticity modulus and ultimate compressive strength in different specimens. Meanwhile, the relationship between elasticity modulus, ultimate compressive strength and the proportion of each composition is obtained. The results show that the similitude material is recognized to satisfy actual tunnel lining properties such as elasticity modulus and ultimate compressive strength .

ZrN thin films were successfully deposited by DC magnetron sputtering on die steel substrates. The objective of this study was to investigate heat treatment on the microstructure, morphology, nanohardness properties determined by X-ray diffraction, field-emission scanning electron microscope (FE-SEM), nanoindentation, and pin-on-disk, respectively. The XRD result shows that ZrN has intensity of (111) and (200) peak after 400 °C for 1 h at lower nitrogen flow rates. The surface of coatings revealed smaller grains and smooth surface under heat treatment. ZrN coatings consisted of lower nitrogen flow rate had much lower friction coefficient, better mechanical properties by annealing treatment process.

Taiyuan Boiler Group Co. Ltd. designed and developed an 850t/h CFB boiler with energy saving technology on the principle of “State Specification Design Theory”. By measuring the ash formation and attrition characteristic of the design coal, with the one dimension mass balance model developed by Tsinghua University, the bed quality of the bed inventory and the pressure drop were modified. Based on the particle density calculated, the heating transfer coefficients were chosen and the arrangements of the heating surfaces were modified. According to the special operation conditions of the user, the practical working conditions for the boiler are determined so as to assure the technical characteristics and structural properties in 850t/h CFB boiler.

The friction materials have many species and they are being used widely, but people have higher requests to friction materials along with the development of technology. the friction material of this expermental optimization formula have the advantages of suitable and stable friction coefficient under high temperature, low wear rate, good restoration characteristics and so on. It can effcetively reduce heat fade of friction and wear under high temperature barking. fricton and wear performance of friction material with second adhesive is better than common preparation friction material , it has higher friction coefficient and lower wear rate, It was determined by physical chemical properities of tin and sulfer. while heating or wearing, the temperature of friction material reach melting temperature of tin, it will become molten state, and sulfer has strong oxidation, on the one hand, tin and sulfer occurred chemical reaction, generating sulfide, stannous (one sulfide tin),on the other hand, while the sulfer is being molten state, it will absorb some abrasive dust, at the same time of generating sulfide, abrasive dust will be adsorb and solidify to pits of friction surface, forming abrasive dust membrane, let the friction coefficient of sample become stable rapidly, reducing the wear rate of friction material.

One approach to extend the network lifetime is to divide the deployed sensors into disjoint subsets of sensors, or sensor covers, such that each sensor cover can cover all targets and work by turns. The more sensor covers can be found, the longer sensor network lifetime can be prolonged.This study propose a novel hybrid genetic algorithm (NHGA) comprising both basic generic operations with a fitness-improving local-search strategy to divide all wireless sensor nodes into a maximum number of disjoint set covers (DSCs). The simulation results show that NHGA outperforms the existing methods by generating more disjoint set covers and prolongs network lifetime.

The study with Li2CO3 and Mn3O4 through the solid state reaction makes cathode material for lithium battery spinel - LiMn2O4. According to past literature, under the solid-state reaction. The experiment carries out sintering at temperature of 850°C.. Cathode materials under these sintering temperatures are made to fabricate battery. For Ni doped LiMn2O4, the capacitance decreasing speed is slow and stable; after 15 times charging-discharging cycles, the attrition rates were 3.05 % or less. The result of experiment demonstrates that the best sintering temperature is at 850°C. Under the condition of 850°C, various contents for extra amount of lithium (1.02 mole-1.1 mole) are fabricated and range of working voltage is released. It is found a further increase of initial capacity to 140.51 mAh/g. LiMn2O4 further extends circulation and usage.

The shipboard power system (SPS) supplies energy to sophisticated systems for weapons, communications, navigation and operation. It is critical for the system to be reconfigurable for the purpose of survivability and reliability. The present paper proposes a new variation of PSO model for restoration of shipboard power system. A new inertia weight of S-Curve Decreasing variation is introduced. Particle Swarm Optimization with S-Curve Decreasing Inertia Weight (SDW-PSO) approach can improve the speed of convergence as well as fine tune the search. The proposed Particle Swarm Optimization algorithm enables to find the optimal combination of loads that can be supplied after the occurrence of the fault, in which the priorities of the loads and the constraint of balance between the total load and total generation are considered.

ZrN films were prepared by magnetron sputtering on die steel substrates. The objective of this study was to investigate the effect of nitrogen flow rate on the microstructure ,morphology, nanohardness properties determined by X-ray diffraction, field-emission scanning electron microscope, nanoindentation, and pin-on-disk, respectively. The XRD shows that ZrN has (111) and (200) preferred orientation under lower nitrogen flow rates. The surface of coatings revealed smaller grains and uniform dense under lower nitrogen flow rates. With increasing the nitrogen flow rates, this result showed ZrN films lead to poor mechanical properties and hardness values. However, films consisted of up high ernitrogen flow rate had much lower friction coefficient.

The worst case analysis by means of software Saber is implemented on a three-output flyback switching power supply. The analysis results offer a criterion to definite error range of the device parameters.

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over solid base Na2O/ZrO2 using a fixed-bed reactor. The CCl2F2 adsorption was multilayer chemical adsorption and its process was corresponding with Freundlich model. Its adsorption heat was from 43.74 to 76.31 KJ.mol-1, and the CCl2F2 adsorption over solid base Na2O/ZrO2 was exothermic and chemical.

With the rapid development of computer technology, the processing ability of image simulation system is becoming stronger and stronger. The widely used AutoCAD (Computer Aided Design technology) in automobile car body drawing gradually extends to automation direction,and it can be more widely used.Realizing the informationization deepening in automobile car body drawing has a very important significance for the modernization construction of our country.Based on the analysis of advantages and disadvantages of AutoCAD technology,this paper puts forwards the application of reliable transmission technology in automobile car body drawing operation,designs automation model of automobile car body drawing system and introduces the information feedback of transport layer in this mechanism,so as to achieve the optimization of highly efficient application in automobile car body drawing system.

Model selection is carried out structural analysis Transmission Tower one of the priorities. Through the establishment of traditional beams - truss hybrid model, improved beam - beam hybrid model and frame model, a modeling analysis of angle steel tower cathead. First on the transmission tower modal analysis, and then the common wind conditions and ice conditions of the maximum stress and maximum displacement results are discussed, and then local analysis. Identify similarities and differences between the three models, discusses the advantages and disadvantages of the model to meet the design requirements of the situation and the results can be obtained more reasonable feasibility.

Under the high temperature of fire, the temperature change of the reinforced concrete beam is very important to the structure study. This paper, with heat transfer theory as its theoretical basis, explores the analytical method, the common method for analysis, calculation method of numerical value and finite element analysis by analyzing the temperature field of the concrete component cross sections under high temperature. With the help of MATLAB, it calculates and analyzes the temperature field of the reinforced concrete beam under the high temperature of fire, determines the temperature rise curve of the reinforced concrete beam in case of fire, and calculates the cross section temperature fields of the beam or pillar under the circumstances of different cross section sizes and different timings of fire on three sides.

The traditional financial distress method normally divided samples into two categories by healthy and bankruptcy. And the financial indicators are typically chosen without using a systematic and reasonable theory. To be more realistic, this paper selected all the companies in a certain industry as the research objects. Twenty-one financial indicators were primarily chosen as the condition attributes, reduction set was obtained by matrix reduction identification based on rough set theory. Then PSO-based clustering algorithm K-means was used to divide subjects into 5 categories of different financial status. The decision-making table was formed with the reduction set using the classification as a decision attribute. Finally, we tested the reasonableness of the classification and generated early warning rules together with rough set theory to evaluate the financial status of listed companies. The results showed that PSO-based K-means algorithm was able to reasonably classify companies, at the same time to overcome the subjective impacts in the artificial measure of financial crisis level. Data generated using this method agreed with the rough set theory for up to 87.0%, thus proving this method to be effective and feasible.

The mechanical property of the concrete under high temperature will go through great changes with much greater deformation. The uneven temperature distribution causes equilibrium temperature stress of the cross section and deformation of components, thus damaging the structure system of the concrete. This paper conducts a high-temperature test on the C25 concrete specimen with fire retardant coating, compares the test result with the test on the C25 concrete specimen without fire retardant coating, and analyzes the protective role of the surface fire retardant coating in the concrete structure buildings in case of fire.