The micro-vibration caused by the locally unstable gas flow field of an aerostatic thrust bearing does always occur even if an invariable load acts on the bearing, which is harmful to the accuracy of an ultra-precision measuring device or manufacturing equipment. However, most researchers forecasted...

The device is made up of walking institution, lifting institution, package institution. Walking institution mainly by package rubber pulley composition, through motor provides power led pulley scroll, to achieve robot in overhead line of walking function; lifting institution is made by two big cantilevers...

In this paper, a linear power amplifier with MESFET tube is simulated and optimized by the application of ADS software and S parameter method. The MESFET tube is a kind of low distortion power FET provided by the company of Excelics and its tag is EFC480C. After optimizing the size of the power amplifier...

Both milling force and temperature are the key influence factor of thin-wall part deformation. Therefore, to study the influence of milling parameters including milling speed, feed per tooth, radial depth of cutting and axial depth of cutting on milling force and temperature in the cutting process the...

The Triassic continental shale from Ordos basin was selected as the research object, through the analysis of X-ray diffraction (XRD), field emission scanning electron microscopy (SEM) and nitrogen adsorption experiment, the mineral composition and pore structure characteristics of Triassic continental...

Shale gas resource potential is tremendous in China, the recoverable resources are 25.08 ×1012 m3. However, they mainly located in the arid area with lack of water, and clay mineral content of shale reservoir is higher, traditional water-based fracturing fluid used for shale gas development has defects...

Based on the panel data of SME firms in the manufacturing industry, this paper explores whether the involvement of venture capital can have significant impact on the manufacturing firms' performance in the productivity efficiency. The lagged value of the shareholding of VC firms is proven to be negatively...

The influence of hygrothermal environment on compressive property of woven carbon fiber epoxy resin composite was investigated via tensile and compress tests under different hygrothermal environment. Moisture absorption, tensile and compressive properties, failure modes, FTIR and dynamic mechanical property...

In order to determine the fatigue limits of two kinds of titanium alloy pipes connected by welding and rolling, the vibration fatigue tests were carried out according to Aero-Criterion HB5277-84 which defines the test method and failure rule[1]. The test adopted the displacement of the pipes' free end...

Based on the basic thought of industrialized building, one prefabricated external thermal insulation system ETIS with point supported horizontal keel was designed in this paper. Bad support was fastened on the structural wall and horizontal keel was fastened on bed support. Then panel was fixed on horizontal...

In the aerospace tracking and control mission the command and display system is deployed to a large number of different command terminals that located in different locations, which makes the coordination between these systems become difficult. In this paper, an agent-based control system is proposed....

Based on the lack of monitoring methods and strength of the outdoor advertising screen remote monitoring technology, the overall framework of the remote monitoring system based on the C/S mode is constructed and the overall design of the monitoring unit and the monitoring center of the advertisement...

In this paper, the lightweight external wall brick was prepared by means of dry pressure molding sintering process to explore the effect of the pore-forming agent on its performance. The shale and clay were used as the main raw materials and additives of bran, coal powder and SiC were chosen as pore-forming...

The 6600 DWT asphalt carrier is taken as an example, utilizing the finite element software MSC/PATRAN and MSC/NASTRAN, which the research on yield and bucking direct calculation of asphalt carrier structural strength is conducted respectively dealing with temperature field and without temperature field....

In this paper, colloidal mesoporous silica nanoparticles functionalized with amino-terminated polyethylene glycol (CMS-PEG-NH2) were successfully synthesized using silica nanoparticles modified with a carboxy group (CMS-COOH) and amino-terminated polyethylene glycol (H2N-PEG-NH2). Moreover, the particle...

In order to prepare targeted nanocarrier to gene delivery, a novel nanoparticle was designed to condense pDNA. Hyaluronic acid was regarded as the targeted bio-materials because the HA–receptor-mediated CD44 receptors existed in many issues which were interacted with tumor membrane. The preparation procedure...

Interface is the information platform for Man-Computer Exchange. It's the key factor of user experience. This thesis concludes the principle and methods of product interface design, in the view of user experience, by research on interface design of industrial products. It uses NEST learning temperature...

Eye Tracking is a technology which can accurately tracking the path of human vision, by recording some key data of human eye movement process. The difference in the recording methods selection will decide accuracy and subjectivity of eye movement data. The device to record the date is called Eye Tracking...

Aiming to solve the problem of difficulty of wiring and operation of infant incubator test, we put forward a wireless smart sensor module based on IEEE 1451. The module can realize the function of self recognition, plug and play. The key technology of wireless smart sensor module is thoroughly discussed,...

Presently, the preparation of high pure manganese sulfate solution shows a long and complex process with low efficiency from the low grade manganese ore. The complete removal of calcium and magnesium ions coordinating with high recovery rate of manganese becomes one of the challenges for the conventional...

This paper analyzes how the deformation pattern of the superstructure's side wall alters when the material parameters of the laminate face sheet are tempered while the Foam-Core Sandwich Superstructure is under vertical and horizontal forces separately. The results revealed that, under each separate...

Sustainable product design has become significant factor for customers' selection, whereas it is difficult to evaluate sustainability with imprecise, vague and uncertain information. This paper proposes sustainable design performance assessment model integrating fuzzy theory and grey correlation analysis...

This paper conducts revisions of the existing elastic-plastic contact models for a single asperity with the fractal surface topographies generated from W-M functions. The expressions of the critical parameters and the contact load-area relationship are deduced in the terms of fractal parameters, asperity's...

The extended finite element method (XFEM) is a newly developed method for studying the fracture problems. With the XFEM, the crack is independent of the grids. Compared with the traditional finite element method, it avoids dividing the complex mesh near the crack tip and remeshing work when simulating...

The plant disposition pattern of the soil dump and tailing pond in a metal mine is defined as the model of grass, shrub and arbor, on which based the restrictive factors of land reclamation in mining area, the optimal allocation principle of vegetation and the experimental research on field. The method...

To improve the strength of hexagonal honeycomb, the structure of reinforced honeycomb is proposed in this paper. The strength of this structure could be adjusted by changing the superposition mode of core material. The theoretical model of reinforced honeycomb is built based on the theory of simplified...

To ensure the safe and stable operation of HVDC systems without grounding electrode, this paper proposes a concept of replacing the HVDC grounding electrode with the converter station's grounding grid. This paper studies the technical problems of heating problem of grounding grid. The result shows that...

In order to overcome the low adjusting efficiency, the bad adaptability and the poor controllability in the conventional mechanical cold heading machine. A kind of novel Computer Numerical Control (CNC) scheme is presented. The overall structure is introduced. The selection methods of main transmission...

Photocatalytic activity of doping TiO2 with different kinds of ions were investigated. Through photocatalytic degradation of methylene blue solution, photocatalytic activities of the three materials after treatment and the influencing factors were compared. The result showed that the degradation rate...

For a two-stage supply chain system which consists of a supplier and a retailer with capital constraint, the supplier provides the retailer with option contract. By establishing the ordering model under option contract for the retailer with capital constraint based on CVaR, the optimal order of retailers...

Sulige gas field lies in the desertification area of Ordos Basin, and the natural environment is adverse there, the difficulty of using traditional methods to manage thousands of gas wells there is great. This paper introduced the development of a type of electromagnetic valve for remote control, which...

In some engineering applications, the probability distributions of some random variables are truncated. Under the conditions, if traditional reliability-based optimization design is directly used, difficulties may arise and this treatment may result in large errors in reliability-based optimization design....

To solve the obstacle avoidance problem when UAV is implementing SLAM, a collision cone is built using obstacle avoidance strategy based on collision cone. By ascertaining whether the velocity direction of UAV motion is within the cone, the occasion of UAV obstacle avoidance is judged. This algorithm...

A diamond heat spreader has been combined with Si microchannel for the improvement of the hotspots cooling capability for GaN high power electronic devices. The effects of the diamond heat spreader and Si die have been simulated using steady model by finite element analysis. It was found that the diamond...

The aging tests of nitrile rubber were carried on in transformer oil, and under compression in transformer oil. The effects of compression stress on the thermal aging behaviors of nitrile rubber were studied by mechanical property measurements. The variations of physical properties during the ageing...

Objective To investigate the clinical value of ultrasonography in screening Turner syndrome(45,X) during the second trimester.Methods Amniocentesis were performed on 3,948 pregnant women with indications for prenatal diagnosis to detect karyotype of the fetus during second trimester , The detection rate...

Objective To investigate the value of prenatal ultrasonography screening fetal autosomal trisomy(trisomy 21 trisomy 18 trisomy 13).Methods Amniocentesis and cordocentesis were performed on 6425 pregnant women respectively with indications for prenatal diagnosis to detect karyotype of the fetus during...

Objective To analyze the ultrasonogram characteristics of ovarian thecoma in order to improve the diganostic level for this disease. Methods The ultrasonic characteristics of 64 patients with ovarian thecoma confirmed with pathology were retrospectively analyzed.Results The tumors located at left side...

As an important part in vehicle powertrain mounting system, hydraulic engine mounts (HEM) affect the noise, vibration and harshness (NVH) in vehicle greatly. The modeling and parameter identification of the lumped parameters in model has great significance in the design and study of HEM. A lumped model...

Jujube is a type of forest-fruit product originated in China. Its harvest mainly depends on manual picking resulting in low efficiency, high strength and cost. In order to improve the level of mechanization of harvesting jujube, this research investigated a rotating-contact harvest method of jujube....

The geometry optimization and the shear performance of the nanopins based on the Y-junction carbon nanotubes (CNTs) are investigated by using the classical molecular dynamics simulations. The results show that the service performance of the nanopin is not sensitive to the length of the inserting end...

Wastewater and sewage sludge samples were collected from a conventional wastewater treatment plant (WWTP) in Shanghai, and the concentrations of a frequently detected brominated flame retardant (BFR), namely hexabromocyclododecane (HBCD), were determined. In wastewater samples, HBCD was detected in concentrations...

For the study of the actual performance of TiAl base self-lubricating joints bearing, this paper adopts the vacuum hot-pressing sintering technology to prepare the self lubricating joint bearing blank body. Prepare TiAl base self-lubricating joints bearing through the mechanical processing method. And...

Based on the fractal theory, this paper quantitatively studies the influence of machining parameters on fractal characterization of typical metallic surface topography. Seven kinds of materials were selected including Q235, 45#, 0Cr18Ni9, HT200, T2, HPb59-1 and YL12. The surface topography was obtained...

This paper introduces the freshness rate factor decays exponentially as time goes on to model a market demand function depends on sales price and freshness rate. At the same time, considering the dual influences exerted from the way freshness-keeping effort level of the reseller to the arrival rate and...

With the improvement of aircraft assembly digitized and new aviation difficult-to-machine materials are widely used, conventional drilling is more and more cannot satisfy the needs of processing. Spiral milling hole technology as a new machining technology is relatively traditional drilling especially...

Braided wire rope has been widely used because of its high strength and high twist resistance, and its safety performance in service has been paid more and more attention.Based on the reasonable simplification of the wire rope, resorting to ellipse Four-Center-Arcs method, the deformation of the rope...