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In order to describe the stress-strain characteristic of the geotechnical dielectric material in the Huanggou pumped storage power station, using the samples taken from the construct site, the consolidation-drained shear test is carried out. Combined with Duncan-Chang model, the test results are analyzed to obtain the parameters of the model. Based on this, the Normalized Behavior is studied, and The results show that the normalized degree is highest when used (σ1-σ3)ult as normalization factor.

With an increasing number of the offshore oil and gas fixed platforms, the traffic environment is becoming more complicated, which will have a negative impact on the safety of both platforms and ships around. Considering the operation method and safety of the offshore oil and gas fixed platform, and the ship’s motion when being not under command, the safe distance between the platform and the ships’ customary routes is determined according to the big and frequent ship type sailing in the routes. The safe distance calculation result provides a basis for both the site selection and the distance keeping for ships passing by the platform and the water around.

A DNA sequence encoding for the human proinsulin was designed according to the codon bias of Escherichia coli and then chemically synthesized. The synthesized DNA fragment was subcloned into pGEX-3X for expression in E. coli BL21 (DE3) and E. coli BL21 Star (DE3), respectively. Conditions for the highest expression of the GST-proinsulin fusion proteins were optimized. These conditions are that cells of E. coli BL21 star (DE3) are incubated in 100mL of the LB medium with 2 mmol/L IPTG and 60μ?g/mL ampicillin at 26oCfor 4h. After disrupted E. coli cells with ultrasonication, inclusion bodies were precipitated from cell lysis and washed. Fusion proteins from the inclusion bodies were redissolved in 8mmol/L of urea. After dialysed in purified water, fusion proteins were analysed by SDS-PAGE. The purity of the fusion protein is about 80.5% in total. The fusion protein from SDS-PAGE was further identified by mass/mass spectrum. GST in the dyad protein is confirmed by the 9 matched sequences. However, the left part is proved a polypeptide of which is completely different from the human proinsulin.

the safety of power grid scheduling is the key to ensure the safe and stable operation of power grid. Scheduling work dangerous point analysis, formulate measures, strengthen precontrol is important means to ensure the safety of power grid. Introduces the analysis of the dispatching work dangerous points and preview. This paper expounds the main work and status quo of power system dispatching operation management, and puts forward solutions.

Effects of T-shaped micro-channel structure sizes on the formation of micro-liquid column formed by vertical-shear-flow were studied. The method of CFD based on VOF (Volume of Fluid) model was used in the computation. H2O and C5H3 were used as continuous-phase and as dispersed-phase. Interface-tracking method was used to get data of the two phases. The size parameters include crossing angle (∠β), width ratio of vertical channel and main channel (W2/W1), depth ratio of vertical channel and main channel (D2/D1), depth-width ratio of main channel (D1/W1). The above parameters affect the forming time of micro-liquid columns, the order of importance is D2/D1,∠β, D1/W1, W2/W1; And for the length, the order is∠β, D2/D1, D1/W1, W2/W1. For the shortest forming time, the optimized parameters of ∠β, D2/D1, D1/W1 and W2/W1 are 90°, 1.00, 1.00 and 1.60. To get the shortest micro-liquid columns, the optimized parameters of ∠β, D2/D1, D1/W1 and W2/W1 are 60°, 1.00, 1.00 and 1.60.

The property of anti-penetration plays a leading role in modern composite target plate. In order to research the mechanism of anti-penetration, a 12.7mm wadcutter was used to penetrate an AD95 Ceramic / Metal composite target plate. ANSYS / LS-DYNA non-linear finite element analysis software was applied to establish and mesh the model based on 3D Lagrange equation. A comparison was made between experimental and numerical analyzing results. A design is given by adding a constrained steel plate and analyzing the best thickness to maximize the property of anti-penetration. The research provides guidance not only for structure configuration and optimal design, also for penetration experiment in the future.

With the 42m trawler as object, an ordinary propeller and a ducted propeller are designed and their open water hydrodynamic performance are simulated by using CFD software. The computed results and experimental results of ducted propeller are in good agreement, which verified the reliability of numerical calculation. Then the computed results of ordinary propeller and ducted propeller are compared with each other, it is found that the thrust and torque of ducted propeller is bigger than ordinary propeller in trawling. This article also discusses the pressure distribution of their blade and the reason why ducted propeller has a better hydrodynamic performance is studied.

Through the scanning electron microscope and energy spectrum analysis of vanadium slag after calcination at different temperatures of Panzhihua Iron and steel in industrial production, analyzed the change of morphology and composition of the various main phase, Focuses on the change process of two main vanadium containing phase which are vanadium spinels and calcium vanadate. The vanadium spinels into calcium vanadate optimal temperature range is 800 ~ 900 °C, and provides a theoretical basis for the extraction process of vanadium, which can further improve the industrial production of vanadium.

The optimum overlay structure and the better regeneration of the old cement concrete pavement were analyzed by empirical method, which compared the merits and faults of crack-seat and rubblization with the better regeneration to the old cement concrete pavement, then the concept of hair-crack-rubblization (HCR) was put forward, specific parameter standard of HCR was calculated by mechanical method. According to the desired requirement of HCR the hair-crack-rubblization machine was produced by Xi’an Changda Highway Maintenance Technology Co., Ltd. After that concrete realizable control standards of HCR and the optimum overlay scheme were gotten by the construction condition, then the merits of high strength, stable plate, good water-resistant and so on after HCR of the old cement concrete pavement, which combines the merits of crack-seat and rubblization, were showed by the engineering application.

Coal blending is widely utilized in coal chemical industry and power plants, and ash slagging propensity, a non-additive property of the pure coals, is difficult to predict and related to its AFTs (ash fusion temperatures). A combustion experimental approach was undertaken to investigate the influence of coal blending ratio on the AFTs of three coal samples Sh-coal, Qi-coal, Que-coal from Ningdong mining areas. The results showed that a nonlinear decrease of the AFTs was obtained with the blending ratios (Sh-coal/Qi-coal or Sh-coal/Que-coal) increasing, the AFTs dropped by 30 °C from 0.5 to 0.8 ratio; the content of Al2O3 can be obviously lowered AFTs. Therefore, coal blending could lower the AFTs evidently. The obtained results in this research can be used in coal gasification process and further theoretical studies.

It is an important factor to predict the LFG production rate and production quantity accurately and conveniently for the LFG recovery projects.According to the characters of Chinese Municipal Solid Waste (MSW) component, the paper studies on the Landfill Gas (LFG) models, and establishes the LFG model that is adapt to the characters of Chinese MSW component. The paper takes the Laohuchong landfill sites in Shenyang for example, predicts the LFG production and analyses the energy utilization and environmental benefit.

To investigate biomass classification technology, such as rotary classifier, and to select appropriate biomass classifier. Through the change of different feeding rates and rotation speeds of the classifier, the classification efficiency and Newton classification efficiency, specific particle size and uniformity index, the recoveries of coarse and fine powder and energy consumption were measured. The results indicate that feeding rate and rotation speed have an important effect on the classification. When the rotation rate of classifier is 300rpm, the classification efficiency decrease basically, but in 78.96kg/h, it is the maximum. And Newton classification efficiency would decrease at first and then increase, in 88.96kg/h, it is the lowest. When the feed rate are 78.96kg/h and 88.96kg/h, as the rotation speed increases from 50r/min to 150r/min, there is a moderate increase in uniformity coefficient, that means the biomass size distribution becomes narrower. The energy consumption means the pulverizer capacity is larger, the less is the wasted energy. It is a common sense that the larger the mill, the higher the efficiency.

Aiming at the preparation problems of Al2O3+cordierite+AlN composite ceramic, the experiment emphatically investigates two influencing factors both the addition of cordierite and Al2O3 and sintering process parameter. The Al2O3+cordierite+AlNcomposite ceramic has been obtained through such technique procedure as mixing materials, ball-milling, forming by dry pressing and pressutrless sintering in nitrogen at temperature between 1350°C~1400°C. The chemical compositions of ceramic are examined by XRD diffraction. The microstructure and composition of the fracture of the materials are observed by SEM and EDS. The results show that owing to the addition of cordierite the composite ceramic has been sintered at 1375°C;the composite ceramic are more dense sintering at higher temperature; more Al5O6N can be obtained by improving the content of AlN, thus improving the thermal conductivity.

In this paper surface modification was adopted on 3 kinds of titanium alloy and TiO2 nanotubes arrays were prepared on these surfaces by anodic oxidation method.nanoindentation and nanoscratch experiments were performed to test the mechanical properties of TiO2 film, such as micro hardness and elastic modulus.Through comparing and analyzing,it is seen that,The film generated on the TC4 has better mechanical properties than the others and TC4 is better substrate for surface modification by anodic oxidation as the implanted materials.

TiO2 nano film with different nano structure were prepared on the surfaces of titanium TA1 and titanium alloy TC4 via electrochemical anodization. The surface morphology was observed with SEM, and it is found that TiO2 films prepared on TA1 surface have porous structures, while the TiO2 films synthesized on TC4 surface look like nano rod. The contact angle(CA) test results show that the TiO2 nano film prepared on TA1 is hydrophilicity and the CA is about 19°,the film on the TC4 is super hydrophilicity and its CA is smaller than 2°. After combined with fluorinated silane the self-assembled film synthesized on the surfaces and they are superhy- drophobic and the Contact angle is 150° and 158° respectively. It is concluded that both nano- structures and fluoroalkysilanes with low surface energy have play an important role in the wettability with the contact angle is more than 150°. The surface only have nano roughness without the low energy does not show superhydrophobicity.

The purpose of the present work is to present a overall design of digital AC servo system, which is based on PMSM on the background of Self-propelled Artillery servo system. A magnetic field Orienting control tactic based on vector control technology is explored. DSP CMOS chip TMS320F2812 is adopted as a control core to design total-digital AC servo system. Since the work current of the servo system is high, the MOSFET component is used to construct the power inverter circuit, rendering the high current controllable. The simulation results prove that the system has good dynamic performance.

laser radar is a kind of modern active optical remote sensing device and is the outcome of the combination of the traditional radar technology and the modern laser technology. It takes laser as the light source and senses remotely the target through the radiation signal generated when the detecting laser and the target interact. This paper summarizes the structure and classification of the laser radar for the purpose of atmosphere composition detection, and also discusses the existing problems and development trends.

Degree of polarization (DOP) is an important physical quantity for describing the optical polarization effect and is widely applied in optical fiber communication, optical fiber gyro and the related technologies. In this paper, the polarization beam combination method is raised to research and manufacture the standard optical fiber light source device with the variable DOP, and an indicated error measurement has been conducted for a DOP meter.

The key components of ringmatrixpress is a loop die, whose periphery clouds of die hole, which is easy to deformation to failure, need for frequent replacement of the mold. This improves the production costs of biomass briquetting technology. The study of stress state of die hole can provide a theoretical basis for the design of strength, long life die hole. By theoretical analysis of the stress of circumstances in the different locations of the die hole, we explore the stress distribution in the die hole and the influence on the strength of the die hole, determine the optimal parameters of biomass briquetting process.By analyzing the deformation produced by die hole under the effect of the pressure load, we seek the law of molding pressure on the die hole.

In view of the influence of a certain amount of the sediment in agricultural irrigation water and low temperature to water meter accuracy, experiment of performance and abrasion under the different sediment rate and experiment of the freezing heaving in the different temperature to water meter were developed, the results show, the error rate of water meter is different under different sediment rate, and the error rate become bigger after abrasion 500h under the different sediment rate, and the reading of numerous water meter become smaller. Under the condition of low temperature, the water meter is easy to happen the frost heaving damage phenomenon when the water meter chamber filled with water, and the water meter is generally not heave when water meter chamber not filled with water. The change of water meter accuracy is little after low temperature frost heave.

A series of new main-chain liquid-crystal polymers (LCPs) were prepared from sebacoyl chloride (SD) and various amount of 4, 4-Dihydroxy-2, 2-dimethyl Benzalazine (DDBA) and isosorbide (ISO). The liquid crystal (LC) properties were investigated by polarized optical microscope (POM), differential scanning calorimetry (DSC) and X-ray diffraction measurements. P1 exhibited a typical nematic thread texture, which contains no ISO. P2-P7 are Sc* and N LCPs, which exhibited broken fan-shaped texture and droplet texture. The introduction of chiral units into the polymers led to a change of mesomorphase, as compared with P1.

High pressure jet grouting pile has been widely used in engineering application, with the increase of depth, demand for construction machinery will increase, also the difficulty of the construction quality control. Through the deep soft soil area in southeast coastal areas in fujian actual engineering example, we have improved ultra-deep Yet Grouting Pile machinery to meet the construction requirements.

In view of the traditional ceramsite using a large number of high-quality natural clay and shale, the destruction of the environment problem, ceramsite was prepared by kyanite tailings in Hebei, The results show that when the kyanite tailings and clay was in the ratio of 7: 3, the preheating temperature was 500°C, preheating time was 15min, calcination temperature was 1100°C, heat preservation time was 15min, the apparent density of ceramsite is 816kg/m3, the particle strength of 851N.

Fly ash is a large amount of solid wastes produced from power plants, use of its resources has always been a matter of the government and experts are concerned. Combining with the characteristics of the nature of the fly ash, introduces the fly ash resource utilization in construction materials using some new approaches and application of the status quo.

According to the peculiarities of repairing of coke oven the spraying coating of normal temperature was used. The energy of the coke oven was used by the spraying powder to adhere to the wall of coke oven. The heating time equation of spraying powder has been deduced from thermal radiation equation, and the computer simulated calculation of heating time which is programmed is based on this equation. The possibility of spraying coating reacting in short time and adhering to the coke oven is speculated. The result of adhering of the spraying powder was proved.

Vibrating lamella thickener (VLT) developed by Kunming University of Science and Technology is a new generation of inclined plate settling device, and in this device such long-standing problems in traditional lamella thickener (LT) as material bonding and blockage between channels in inclined plates, material deposits and blockage in cone bucket, as well as unsteady discharging of high solids underflow, etc. are effectively resolved, through periodic vibration of inclined plate modules, the use of built-in device for removal of deposited material on cone wall and of forced discharging device for high solids underflow. Paste discharging is now a new way for the effective treatment of tailings in recent years, due to its superiority for mining safety and environmental protection. The industrial tests for paste thickening of iron tailings were carried out in a mineral processing plant of Mining Co., Ltd. of Panzhihua Iron and Steel Group, using a ZXNQP-32 VLT. In the test the size distribution and settling characteristics of the tailings were analyzed, and the main operating parameters in the VLT were tested under the natural settling and flocculated settling conditions, respectively. The results of test indicate that the solids concentration of underflow from the VLT is capable of reaching higher than 70%; meanwhile, the solids content in overflow from the VLT is as low as less than 300 mg/l while flocculant is added in the ore pulp for pretreatment and such an overflow can be directly discharged into environment or be recycled in the plant. It is thus concluded that VLT is effective for paste thickening of iron tailings.

This paper presents a new scheme of lifting and lowering base plate used in deep-water exploration ship. The scheme with a wire rope and two fixed pulley acted as rotary lifting points ensures that the base plate can be lifted or lowered when one of the two winches breaks down. A closed circuit system is designed to actuate two winches to lift or lower the base plate. The working principle and characteristics of the hydraulic system was described. The parameters of components in the closed circuits were calculated according to the design conditions and design requirements given. Finally, the hydraulic equipment based on the hydraulic system was tested by using a simple test setup. The results of the test indicate that the hydraulic equipment meets the design requirements.

The detailed mechanism of divorced pearlite in bearing steels began to be actively discussed more recently. The survey of divorced pearlite in higher Mn bearing steel was carried out through scanning electronic microscope following isothermal transformation heat treatment. The results show that while divorced transformation taking place in the higher Mn bearing steel just slightly below A1, the cementite could be produced in such way as growing on the base of pre-existing cementite particles in austenite, or emerge either in globular particles or in short rod directly from the austenite. Under isothermal transformation, the carbon atoms in austenite prefer to precipitate on the original boundary of the austenite. The enough small size of the cementite particles remained in the austenite is helpful for getting spheroidal cementite particles structure through divorced eutectoid transformation.

We used the iron tailings with different concentrations of raw slurry and the classifier overflow after desliming for natural sedimentation and adding flocculants flocculating sedimentation test research. The results show that: the settling velocity is slower during the natural sedimentation, The effect that concentration on the settling velocity of material is larger, with the increase of concentration, particle settling velocity drop, When the concentration reached 20%, material group is in a state of suspension, particle is essentially not settlement; Adding polyacrylamide flocculant for the pulp material pretreatment, the settling velocity is obviously improved than natural sedimentation, Supernatant turbidity also decreased significantly, but the pulp concentration still has a great influence on the sedimentation rate, the higher the concentration of the settlement, the slower settling velocity. The test result is according to the theoretical formula of settlement.

Taking the ZY5600-16-34 hydraulic support as the research object, using Pro/E software to build its shield beam’s three-dimensional model, and use ANSYS software to take finite element analysis on intensity of the shield beam. Then optimize its structure based on this. Through taking new finite element analysis on the new model, the results show that the optimization design is effective to increase the strength of shield beam's damageable parts, to provide a beneficial reference for the shield beam’s design.

this review summarizes an important factor of clogging in subsurface flow constructed wetlands ¬(SSF)—field distribution. The efficiency of filter media and the spatial distribution of biological growth are determined by the flow field distribution directly. If the flow field distribution is un-uniform, it would accelerate the clogging of substrate. The influencing factors for flow field distribution, including hydraulic loads, properties of filter media, filling structures and root distribution were investigated, and the clogging reasons were discussed additionally. At last, this study showed some corresponding research methods, and helping in the process of research and development of subsurface flow constructed wetlands in solving clogging problem.

Based on the structure and working principle of our giant magnetostrictive actuator (GMA), the properties of the driving magnetic field were researched. A 3-D nonlinear magnetic field model of the GMA was established with the finite element analysis method, and the magnetic field distribution of the GMA was obtained with the software ANSYS. Then the 3-D model helped us to find the effects about the distribution of magnetic field of the GMA from the structure. The 3-D magnetic field finite element analysis model can give us a new tool of GMA design and analysis.

In the finishing machining, processing parameters directly affects the quality of machined surface. While the micro topography of the surface maps with the fractal dimensions. The paper researched the relation between processing parameters and fractal dimensions through the experiments in order to obtain the relationship. Through the design of orthogonal rotation experiment, determine the experimental parameters. Then measure the experimental sample for the surface and calculate the fractal dimensions using the box counting method. In the end, obtain the functional relation of processing parameters and fractal dimensions by regression method. The results show that the specific processing parameters of the surface can predict the fractal dimension by this formula. And this provides reference for selection of processing parameters.

Discussed the principle of electro-optic sampling technique and implementation methods of Ultra-fast electrical signals, the electric field of electro-optical crystal and sampling pulses as well as the interaction between the principle of time scanning unit, established the coplanar waveguide parameters model, and analyzed the technical indicators of test system.

The paper analyzed the sulfur in steel for civil engineering in 150t converter in TangSteel. Based on the analysis of desulfurization process and the thermodynamic conditions in converter, the operation of desulfurization was optimized. The industrial tests for desulfurization were carried out, and the results were analyzed. The results were shown that the distribution coefficient would be the highest value, when the alkalinity of slag was 3.5 and the FeO content was 21% in making SPHD steel. The distribution coefficient would reduce, when the temperature was increased, especially more than 1700°C, so end point temperature should be best less than 1700°C.

Degree of Polarization (DOP) is a very important parameter for light polarization effect. The DOP meter is widely used in optical fiber communication and gyroscope. In this paper, several measurement methods of DOP are compared and analyzed, and also a calibration method of DOP meter is present as well as the measurement results.

As an important parameter in the laser communication system, the narrow linewidth of tunable laser source (TLS) must be measured accurately. Therefore, the linewidth of a TLS was measured with the delayed self-heterodyne detection method in the present work. The total-reflected delay line was used in the measurement system for make full use of 25km single-mode fiber delay line. The measured linewidth of the 1550 TLS is of 127 kHz, in agreement with the nominal value.

Three kinds of schemes of passive heave compensation systems (PHCS) for base plate are presented in this paper. These schemes are PHCS based on winch, PHCS based on weight and PHCS based on hydraulic cylinder. An analysis focused on the principles and the characteristics of these schemes is developed, and the hydraulic systems of these schemes are also established. This provides an important theoretical guidance for choosing the scheme of the passive heave compensation system for base plate according to different conditions.

Calcium-activated chloride channels (CaCCs) play pivotal roles in many physiological Activities, including transepithelial fluid secretion, smooth muscle contraction and sensory transduction. TMEM16A is a bona fide calcium-activated chloride channel，which was discovered by three independent labs in 2008 after Calcium-activated chloride channel current was recorded about thirty years ago. In this study, DNA fragments encoding mouse TMEM16A with green fluorescence protein (GFP) fusion protein were subcloned into pcDNA3.1/Zeo. Transient transfection condition was optimized and Fischer Thyroid epithelial cells (FRT) expressing TMEM16A were got by stable transfection. The classical calcium-activated chloride channels current was recorded in FRT cells stably expressing TMEM16A by whole cell patch clamp technique. These results were beneficial for the delving into the effects of other bivalent cations on TMEM16A-CaCCs and the role of TMEM16A-CaCCs in cell proliferation and migration.

Based on characteristics of high-speed trains, a special passive protective structure was designed and simulated by the non-linear FEA code LS-DYNA. The two-step energy-absorbing structure fixed on the cab side and the similar function structure on the other end were studied. It was proved that the two-step structure deformed orderly and had an energy absorbing capacity of 3.4MJ which could protect the cab effectively and that the rear end low stiffness zone had an energy absorbing capacity of 6.5MJ which also could protect the integrity of the passenger areas. Three typical train-to-train collision scenarios were studied by full-scale FEA method.

In this paper, the electromagnetic shielding fabric with Ni-Cu-Ni three layers and colorized appearance was prepared by the electroless plating and colorized electroplating. The current density was distributed unevenly in the course of colorized electroplating, which resulted in the nonuniform color of the electroplated fabric. In this paper, this problem was solved by improving the electroplating fixture. The adhesion strength and the conductivity of the coating were measured respectively. The results showed that the Ni-Cu- Ni multilayered coating possessed stronger adhesion strength to the fabric substrate than single layered coating, and the conductivity of coating was better than that of pure metal.

In this article, the equation of the starch and fine hematite particle has been put forward combining with the collision theory. After analyzing the equation and test data, the reaction order of the starch and fen hematite particle can be obtained by integration method and half-life method, which is first degree. It lays the foundation about adsorbed rate equation of the starch and fen hematite particle.

In order to improve the scientificity and rationality of life evaluation of internal coating on in-service natural gas pipeline, the evaluation model of life evaluation of internal coating based on fuzzy theory is proposed. The model transforms the fuzzy appraisal of zone index to the overall fuzzy appraisal by fuzzy evaluation, and the final evaluation score can be computed combined with comment set. The model structure and concrete steps have been clarified in this paper, and applied to the life evaluation of resistance-reducing internal coating of five-year-old in-service natural gas pipeline, the application results indicated that it is feasible and has the widespread serviceability.

A frosting test bench was designed, and unsteady frosting on vertical plate surface was dynamically described with liquid nitrogen as working medium under natural convection conditions. The variation of frost thickness was analyzed, and the flow state of moist air and temperature distribution near the vertical plate were described. The experimental results show the unsteady frosting of vertical plate surface under natural convection and cryogenic condition actually includes several steps: formation of frost crystals, growth of frost crystals and growth of frost layer. The initial frosting rate is large, but the rate decreases as time goes on until the frost layer thickness is unchanged. Moist air conducts a top-down flow near the vertical plate, and the rest of moist air flows into the main flow. The temperature of moist air decreased systematically along the tangential direction of vertical plate from top to bottom and along the normal direction of vertical plate from far to vertical plate surface.

This paper presents a heave compensation system for base plate used in 3000m deep-water exploration ship according to the sea conditions and the compensation requirements. The heave compensation system consists of a passive heave compensation system and an active heave compensation system. The passive heave compensation system with two hydraulic circuits and two air circuits is described, and the working principle is analyzed. The active heave compensation system, which consists of the hydraulic compensation cylinder, the hydraulic system using the closed-circuit and the electrical control system, is also established, and the working principle is investigated. The heave compensation system can keep compensation tension in the wire rope within certain range and make the rod run at design range (±500mm), which can avoid the serious equipment damage and a safety hazard to operators.

In this paper the mechanisms of the bottom radiant noise generation of a given mini vehicle was investigated and the corresponding countermeasures were put forward in reducing the noise of a diesel engine. According to the analysis of acoustic signals and vibration signals measurement, an investigation of the noise source identification in a given vehicle was presented. With the sound intensity method, the major sources of the bottom radiation noise of the engine under three operating conditions were surveyed. The research provides the reliable basis for the engineering practice to reduce vehicle noise level.

Semi-fixed abrasive plate (SFAP) lapping is an effective ultra-precision lapping method. It can efficiently obtain good surface quality in ductile regime machining. Probability density function of abrasive grains cutting depth is the key factor to control removing mode. This paper verified the function by analyzing and comparing simulation results and detection results. It showed the simulation results were consistent with the detection results. The more fine grits SFAP could result in the more consistent cutting depth on workpiece surface, and standard deviation of cutting depth distribution of 4000# SFAP was only 0.0754, compared with 1000# SFAP (0.1527).

TiC reinforced Ni-based composite coating added with 10% TiC particles was prepared on the surface of Q235 steel by plasma cladding. SEM as well as EDS and XRD were used to investigate the microstructure and formation mechanism of composite coating. The results show that between composite coating and substrate is metallurgical combination, and the microstructure of composite coating is composed of basic microstructure dendrite γ-Ni, interdendritic eutectic structure (α-Fe+Cr7C3+Fe3C) and dispersed TiC particle. The maximum value of micro-hardness of composite coating added with 10% TiC particle is 440 HV0.2.

Engineering plastics has many uses, such as national defence, communication and scientific research. In this paper a new experiment plan was proposed in order to get a new engineering plastics forming method. Through the compressive test of polyoxymethylene powder, the process parameters such as temperature, stress and velocity are obtained.Based on the parameters got from compressive test polyoxymethylene powder solid extrusion forming was studied by self-made device. Microscopic analysis and mechanical properties test show that the process parameters are reasonable, the crystallinity increase and molecular chain is oriented along the extrusion direction, as a result the tensile strength and modulus increase greatly.

This paper presents a mold cavity surface subdivision method by using image boundary detection technology to realize high efficiency NC machining. From the new perspective of image processing, the method constructed an optimal cutting direction angle field image in the u-v system of parameters according to the relationship between maximum cutting bandwidth and cutting direction in the theory of iso-scallop height firstly, and then fuzzy c - means clustering method was applied for subdivision surface boundary detection. Experimental results demonstrate good performance of the proposed method in distinguishing and extracting boundary points of surface subdivision.