Faced with the threat of environmental pollution and energy consumption, China has put forward the sustainable development policy, and encouraged all sectors and industries to realize energy-saving production. As important energy supply units, power plants should also actively explore an energy-saving...

the jamming effect evaluation of ISAR is a hot and difficult issue in the field of electronic counter measures (ECM). Traditional evaluate methods are unsuitable to ISAR because of its new system; a new evaluation method of barrage jamming on ISAR is given according to the principle of radar jamming...

With the rapid development of radarsignal processing systems, a great demand of high-speed communication is required. JESD204B interface has become an outstanding solution for ADC-related data transmission, and has been widely applied. However, the synchronization of multiply JESD204B-based ADCs has...

A supramolecular guest copolymer (PNAP-co-PAM) based on naphthol-containing monomer (NAP) and acrylamide was synthesized via Atom Transfer Radical Polymerization. The structure of supramolecular guest copolymer was characterized by NMR and GPC. And the self-assembly behavior of supramolecular guest copolymer...

We study the problem of parameter estimation in in wideband bistatic MIMO radar system. Firstly, we propose a novel algorithm to estimate Doppler stretch and time delay in fractional Fourier transform (FRFT) domain. Secondly, we also construct two sub-array models based on the peaks of fractional Fourier...

Objective: To study the genetic problems of powdery mildew resistance gene in tobacco. Method: after tobacco powdery mildew resistant variety and susceptible variety provided by a greenhouse during May 2015~ May 2016 were selected as the research object, to build a genetic model, genetic laws of resistance...

At the present stage, with the continuous deepening of urbanization of China, the urban population increases day by day. As a result, water demand and urban sewage discharge also grow. Nowadays, some factories in peri-urban areas violate laws to discharge wastewater, which greatly threatens our water...

in recent years, product design concept has extended and expanded continuously. People's attention to low carbon concept improves gradually. In particular, the concept of low carbon and environmental protection starts to fuse in product design so as to improve environmental protection idea of products,...

In the construction industry, the construction quality and safety attract a widespread attention, and such problems are also critical in this industry. The acceleration of urbanization in our country results in ever-increasing construction problems, among which crack and leakage are more common. Thus,...

In recent years, plastic film mulching in our country has been widely applied to agriculture and well promote the development of agricultural industry. However, the residual pollution of plastic film mulching affects the better development of agriculture, because when the age limit of plastic film mulching...

A field experiment was conducted to investigate the single and combined of lead (Pb), cadmium (Cd), and cooper (Cu) on the growth and development of rice plants and the uptake of these heavy metals by rice. The results revealed that the growth and development of rice plants were more affected by combined...

The Alkali/Surfactant/Polymer formulation is selected based on surfactant solubility tests, phase behavior experiments, IFT measurements, polymer viscosity measurements and alkali/surfactant/polymer compatibility tests. Ultralow IFT (

In this paper, Effect of different contents of Ce on the Mechanical Properties of ZK20 magnesium alloy and thermal deformation behavior, through the use of room temperature tensile and compression test thermal simulation, analysis Ce element is present in the form of ZK20 magnesium alloy and its alloys...

In this paper, Effect of different contents of Ce on ZK20 magnesium alloy by conventional metallographic, X-ray, SEM, XRD, analysis of Ce element exists in the form of ZK20 magnesium alloy and microstructure of action the results show that: in the experimental range (0% ~ 0.68%Ce (mass fraction)), with...

Membrane bioreactor (MBR) technology has currently been widely researched and used in water treatment field. In order to further expand the application fields and control membrane fouling problem of MBR, powdered activated carbon-membrane bioreactor (PAC-MBR) combined technology has become a study hotspot...

Consideration the effects of surface tension on the elastic field of solid material has applications in several modern problems in solid mechanics. This paper proposes an application of surface elasticity theory in the analysis of contact problem at nanoscale. The Fourier integral transform method is...

Cancer stem cells (CSCs) have emerged as a population of cells that plays a vital role in recurrence of metastatic cancer, particularly resistant to chemotherapy and radiotherapy. In this article, we will discuss the correlation of CSCs with tumor immunology, microenvironment, long noncoding RNAs (lncRNAs)...

In order to resolve the resonance problem of jack-up riser with drill string, the frequency equation of natural transverse vibration with compressive axial load and the length of the riser above the seabed as independent variable was derived in this paper. Then the frequency equation was solved by the...

The purification effect of the blow wash method, low thermal air blow wash method, vacuum method and alcohol cleaning + blow wash method for helium mass-spectrometer back pressure leak detection were researched and compared. It is found that these four purification craft will not accelerate the helium...

Concrete is one of the important materials in engineering construction. The uniaxial compression experiment reflects its bearing capacity and deformation performance, which is an important method for concrete material properties research. In this paper, the traditional uniaxial compression experiment...

COD standard discharge of wastewater in offshore oilfields is an important part of oilfield wastewater treatment. The polymer-contained oily wastewater from oilfields in Bohai Sea was taken as the object. Combining with the wastewater treatment experiments, the major composition of COD as oils, polymer...

The curing reaction characteristics of modified amine-epoxy and epoxy asphalt system under different heating rates were analyzed by differential scanning calorimetry (DSC). The relationship between curing degree and activation energy during the curing reaction is studied. The Kissinger equation was used...

A series of aryl-substituted pyrazine derivatives, as well as their s-triazine analogues, have been synthesized. For the three-branched compounds, the pyrazine derivatives show strong emission, while its s-triazine analogue TSTA shows too weak emission to be detected. Furthermore, the two-branched pyrazine...

The exposures of aquatic organisms to pollutants are usually pulses yet the exposure concentrations in the standard toxicity tests are constant. It raises a question that whether these standard tests include the effects of pulse exposure Therefore, 24-hour pulse exposure to 4 heavy metal ions (Cd2+ Cr6+...

Magnesium alloy has the great advantage of aluminum compared to other light alloy materials, so magnesium alloy is being carried out step by step in automotive applications and attracted attention of the automobile industry because of superior characteristics of recirculation replace previous material...

Vacuum tube is working in a very harsh conditions, a high requirement for structural reliability has to be put forward. The research method of structural dynamic characteristics analysis was discussed in this paper, and the method combined finite element simulation and random vibration test is used to...

Electrolysis is an important branch of metal smelting. But due to the introduction of rectification device will produce a large number of harmonic, this undoubtedly greatly increased electric cost and the maintenance cost. This article used harmonic data in power supply system as the simulation parameters,...

In order to decrease the vibration of aircraft hydraulic pipeline, the vibration control techniques are studied from two aspects, i.e. suppression of the vibrating source and installation of dynamic vibration absorber. In this paper, the methods of increasing the length of the tubular joint and reduce...

Variable speed constant frequency (VSCF) doubly fed wind power generation system, which is mainly composed of doubly fed induction generator (DFIG), excitation control system and wind turbine, is a complicated system of electromechanical energy transformation and control. It is quite necessary to study...

In high-speed train, the harmonics generated in invertor due to control and nonlinear of switch may lead to the torque ripple in different frequency and amplitude. The driving device which consists of rotor, coupling, gear, shift and wheels of bogie has some resonance frequencies. When there are frequencies...

In high-speed train, since parts of driving medium are not fully rigid, it is common to have fluctuation of rotating speed in different sizes and phase leading to shaft torsional vibration in driving devices for kinds of reasons. Slight vibration can change the torsional stress on axis, which aggravate...

Multi-scale bistable array (MSBA), which combines normalized scale transform, stochastic resonance effect driven by colored noise and parallel array, can be applied to weak signal detection under heavy noise. The experimental application in incipient fault feature detection of rolling element bearing...

Precise and high efficiency of moisture content detection is important to the oil production and management in the oil chemical industry. In this paper, a new technology on moisture content automatic detection based on single chip microcomputer is proposed. This system can accurately measure the moisture...

Traditional six-sequence components can only be applied to the double-circuit lines with symmetrical parameters. In reality, there may appear partially coupled lines with asymmetrical parameter because of the difference in construction. A new decoupling method is adopted to solve this problem. Three...

In terms of domestic, road surface is divided into cement concrete and pavement of asphalt concrete. Asphalt concrete pavement has the characteristics of fast repair, low noise. So is a good use of asphalt pavement quality of road, but if you want to play to the performance of the asphalt surface, should...

The modal analysis is conducted to the base -tower. The effects of stiffness changes in different directions of the pile foundation on the natural frequency of the wind turbine is studied. After the analysis to the harmonic response of the base-tower, the response of the structure of the tower at different...

DQM is widely used to solve common boundary conditions of a variety of structures, but rarely applied to the complex boundary conditions corresponding to the actual projects. Most of the time , what is obtained is the dimensionless frequency, which can not be applied directly to the general engineering...

In this paper, it analyzes the characteristics of the changes of meteorological factors and short-term load. Besides, it studies the relationship between meteorological factors (temperature, humidity, rainfall) and short-term load forecasting, so as to select the important meteorological factors, after...

Wind-thermal-bundled power transmission by UHVDC system is regarded as one feasible way of developing global clean energy in the future and its characteristic of stability should be paid attention to. Different wind-thermal installed capacity ratio is proposed with the wind from the change of power angle...

In order to improve the reality of substation training environment, a 3D training system is developed to train operators' operating skills and ability to deal with accidents by means of a virtual reality environment. Functions, architecture, key technologies and application of the substation simulation...

Today's computer science and technology is developing rapidly with the development of optical technology. But any kind of technology development will be subject to its own limitations inherent physical properties. With the development of the VLSI, best integrated on a single chip electronic components...

With the development of power enterprise informatization,the information and communication security have get more and more attention.With the further development of Henan Company"two transformations",the information and communication security are facing the new situation and challenges. Aiming at these...

A kind of backstepping controller is designed for a kind of pitch channel model of hypersonic aircrafts. The main task is to realize attack angle tracking of hypersonic aircrafts. Compared with traditional linear design method, the main difference is that the nonlinear model is directly used in the design...

Compared with conventional combustion, catalytic combustion as a developing technology could make the pollutants emissions to zero. The experimental studies and theoretical analysis have been involved in this essay to study on if catalytic combustion furnace can burn overglaze color.In this paper, by...

Through the analysis of surface defect characteristic about mechanical parts, a new method of based on target feature was presented to surface defect detection of mechanical parts. First of all, the test image is processed by mean-filter in order to eliminate the effect of noise on the detection. Secondly,...

The study included for the innovative design of the image electronics course teaching experiment device, object oriented higher vocational college, school teachers and students. The results of the project to take a most intuitive and the most feasible way to replace the existing teaching equipment. It...

In order to obtain the optimal values of cable force, and determine the reasonable finished bridge state for large span Cable-stayed bridge with hybrid girder, the space finite element simulation analysis model of the whole bridge is established, considering the characteristics of its span arrangement...

The microstructure and associated formation mechanisms of deformation twins (DTs) in Cu-Nb alloy prepared by mechanical alloying (MA) at room temperature have been investigated by transmission electron microscope (TEM) and high-resolution TEM (HRTEM) observations. The results show that DTs form in Cu...

A Ni-based alloy gradient coating with four layers of the different composition was produced on surface of Cu alloy substrate using YAG laser. The microstructure, anti-wear and anti-heat shock properties of the gradient coating were studied by means of analysis techniques. The results show that there...

Parabens extracted from five kinds of daily cosmetics by ultrasonic extraction were detected by high performance liquid chromatography. The optimal extraction solvent was dichloromethane. And the extraction time was 15 min. The linear range was from 0.01 to 50.0 mg/L. Parabens were found in 3 kinds of...

Using Fe55 spherical fluxed alloy power as the raw material, a Fe-based alloy coating on the surface of steel was deposited by a semiconductor laser under the optimal process parameters. The microstructure and properties of the samples were analyzed by means of OM, SEM, XRD, the micro-hardness and frictional...

The ZrO2 particle reinforced Fe60 alloy coatings were deposited on the surface of steel by laser using Fe60 self-fluxing spherical alloy powder adding mass fraction of 0.1%, 0.3%, 0.5%, 0.7%, 0.9% content ZrO2 powder. The structure and hardness of the samples were analyzed by the means of OM SEM XRD...

In this article, a modified approach for drawing force estimation of bi-metallic composite pipe forming is proposed in the light of the results of FEM simulation, the assumptions of plane strain and elastic-perfectly plastic material model are employed additionally. The modified approach for drawing...

The downhole throttle technology is wildly used in Sulige gas field which was low voltage, low yield. To evaluate the service performance of throttle, property analysis of throttle rubber material under high temperature and high pressure in Sulige gas field was researched in this paper. An autoclave...

The preparation and characterization of composites of MgSO4•7H2O compounded with KAl(SO4)2•12H2O for thermal storage are reported in the present article. The co-melting method is employed to conduct the preparation. The thermal properties of the composites are studied. The results show that: the phenomenon...

Chaotic motions of a Rayleigh-Duffing oscillator with periodically external and parametric excitations are investigated rigorously. Chaos arising from intersections of homoclinic orbits is analyzed with the Melnikov method. The critical curves separating the chaotic and non-chaotic regions are obtained....

With the development of economy and technology, the new technology, new methods and new equipment are used in the construction of overhead transmission line. Currently, the part of the construction organizations lack cognition to this kind of new technology and new methods. Instead of, they rely more...

With the improvement of mechanical construction level of China, the organization planning of construction equipment in the mechanical construction is more and more important, while the construction organization measures of mechanized construction for transmission line are lacks of related research at...

The falling of wear layer on the surface of roller is a main form of roller failure. Based on the typical structure of normal roller and bionic coupling theory of structure and material, a coupling roller with strips on the surface of damping layer is designed. To study the mechanical property of the...

In order to improve the service life of weapons, an erosion additives of urea formaldehyde(UF) resin matrix composite particle is prepared by using in-situ polymerization method. The morphology composite particle is represented through scanning electron microscope, and the thermal analysis method is...

More than 80 percentages of high-speed sealed angular-contact ball bearings are lubricated by grease. The grease filling amount has a great influence on bearing performance and service life. The static space ratio s and movement space ratio d were analyzed and calculated in this paper. Bearing temperature...

The traction behavior of a special grease was tested on a self-made test-bed. The experiment were performed as close to the actual working conditions of the bearings, and then the traction curves were analyzed. The performances and applicability of T-J model and a kind of exponential model with four...

The RN wind turbine bearings are difficult to machine as they are large and heavy. Thus the analysis of inner diameter hard grinding process is necessary. In this paper, the parameters related to machining quality were studied based on the grinding principle and experiments, and the optimized machining...

In this paper ,the research object is the double friction drawing reel of winch which the rated load is 50kN. We identified the main parameters of the double friction drawing reel, includes the bottom diameter of reel , the type of groove, the pitch of groove, the depth of groove, the radius of groove...

The regularity of the through-feed superfinishing of the taper roller is considered, the radial contact arc length between a oilstone and a roller is calculated, the model of superfinishing dynamic valid cutting edge numbers is built, the influence of key parameters to radial contact arc length and dynamic...

The cordierite powders were successfully synthesized by a solid state reaction method, by using raw materials of high purity powder of MgO, Al2O3 and SiO2, mixed according to the stoichiometric ratio of cordierite. The cordierite powders were prepared under different manufacturing conditions and the...

Based on stringing construction of the conductor in power transmission engineering construction, Shanghai Power Transmission and Transformation Engineering Company designed the double rails propelle type crossing frame, which was used to protect the important crossed objects. Before the crossing frame...

Based on the principle of human factors engineering, the relevant data of the users including the babies and the caregivers are analyzed to provide parameters for mechanical structural design. The designed adjustable baby carriage/walker features novel multifunctional and is suitable for the babies in...

PTFE/aramid woven fiber liners were modified by acrylamide, phosphate ester coupling agent, respectively. The effects of the modified liner on the friction coefficient, the wear loss and the friction temperature of self-lubricating spherical plain bearings were investigated by using self-made compound...

In this paper, effect of frequency on multi-axial fretting fatigue damage behavior of Al-Zn-Mg alloys is studied. Point contact fretting fatigue tests are used to research effect of frequency on multi-axial fretting fatigue lives, fretting wear area and fracture appearance. Based on experimental results...

Experimental analysis of frequency on tensile-compressive fretting fatigue behaviour of Al-Zn-Mg alloy was studied in this paper. Effect of frequency on fretting fatigue lives, damage characterization and fretting fatigue fractures of Al-Zn-Mg alloy were researched under different frequencies. Factors...

A global energy demand projection model (GESDA), including the global energy service demand module, the energy system optimization module and the carbon emission module, for projections of global energy service demand , energy demand and supply, and associated carbon emissions. Projections of global...

Digital Electro Hydraulic (DEH) control System, a key element including the nonlinear aspects, is an important control component of the steam turbine control system. The changes in parameters of DEH affect greatly on dynamic characteristics and quality of electricity produced by steam turbine. This paper...

Focused on problems of the grid enterprise in the energy saving and emission reduction works at present, this paper systemically and comprehensively design the energy saving and emission reduction system for the grid enterprises by combining the current energy saving and emission reduction situations...

The surface modification of the tourmaline powder with acryloyl chloride was studied to prepare the polymerizable organic tourmaline. The experimental results showed that the surface of modified tourmaline had a better hydrophobicity compared with unmodified tourmaline when the mass ratio of acryloyl...

As the actual take-off weight of the aircraft is less than the maximum take-off weight, the technology utilizing thrust less than maximum take-off thrust for take-off is called reduced thrust take-off. Reduced thrust take-off is in generally divided into Assumed Temperature and Derate Method. In this...

The purpose of this study was to observe the effect of β-amyloid protein injury on intracellular calcium homeostasis in Hep-1 cells. Aβ25-35 was used to build the Hep-1 cell model of AD. Intracellular Calcium measurements was performed by incubation with the calcium indicator probe and then observed...

To improve the problem of delayed voltage recovery after fault, a dynamic voltage/var sensitivity model based on integral mapping is set up and a generator excitation control strategy based on WAMS is presented in this paper. It provides voltage supporting after voltage drop through increasing the reactive...

The main factors of dynamic reactive power output are analyzed theoretically in this paper. A dynamic reactive power control strategy based on local voltage signal is presented. Monitoring the high side voltage online, the power unit which high side voltage is conformed to the preset criterion, is selected...

In this paper, a broadband and highly efficient reflective polarization converter based on Z-shaped metasurface is demonstrated at sub-terahertz (THz) frequencies. The polarizer can convert a linearly polarized (LP) wave to its cross-polarized wave at three resonant frequencies, which can also convert...

The design and simulation of an asymmetrical coupling quadruple-resonant bilayer terahertz metamaterial based on Electric-inductance capacitance (ELC) resonators are presented in this paper. The simulation results show that the resonant frequencies are 0.173, 0.323, 0.481 and 0.622 THz, the first two...

According to the requirement of communication link simulation in the process of simulation experiment, this paper designs a framework of distributed communication simulation. The framework can dynamically load communication efficiency calculation model which exists in the form of a DLL for different...

In order to analyze the inter-harmonic affections on the voltage flicker, the relationship between the inter-harmonics and flicker analysis are carried out. In order to be able to accurately determine the level of inter-harmonics to make the electric light flicker, inter-harmonic-flicker limit curve...

This paper describes in detail the principle and process of transparent task mode by comparing the traditional electricity-price issuing mode and the transparent task electricity-price issuing mode. Experimental results of the emulational platform district and the on-site platform district are integrated....

The trace tracking control for quadrotor aircraft with system uncertainties and constraints for output tracking error is addressed. Uncertainties in quadrotor system is estimated by utilizing linear extended state observer. In addition, the backstepping method using barrier Lyapunov function is designed...

A kernel adaptive filtering de-nosing method for telemetry signal was proposed. The telemetry vibration signal is often interfered with Gaussian noise and impulse noise at the same time, the tradition de-noising method cannot obtain good de-noising performance. In the vehicle test, the vibration signal...

There are many factors that affect the performance of active power filter, which is a key factor for command current tracking control. Aiming at the deficiency of traditional PR controller, this paper puts forward an improved PR controller—vector resonant controller. The controller has the advantages...

Based on investigation data on Pb in bottom waters in Jiaozhou Bay in May, September and October 1983, we analyzed the horizontal distribution of Pb, and reveal the mechanism of high sedimentation of Pb. Results showed that the horizontal distributions of Pb in May, September and October 1983 were totally...

Based on investigation data on Pb in bottom waters in Jiaozhou Bay during 1979-1982, we analyzed the horizontal distribution features of Pb. Results showed that there were high value regions in bottom waters in the center of the bay mouth, and there were three horizontal distribution features of Pb contents...

Based on investigation data on Pb in bottom waters in Jiaozhou Bay in different months during 1979-1983, we analyzed the seasonal variations of Pb contents and pollution levels. Results showed that the pollution levels during 1979-1983 were light/moderate, and the pollution levels in the bay mouth were...

GW16 type isolation switch of outdoor high voltage system is the commonly used power distribution equipment in 220 kV power system. And it is widely used in the substations that maintained by the EHV power transmission company of Hunan province. It is mainly composed of a static contact assembly, main...

The voltage of power grid will drop when the units pump water in the pumped storage power station.This paper uses the method of simulation and field test to study effect of reactive power regulation on the power grid in the pumped storage power station,which will provide reference for voltage regulation...

Coaxial self-vibration and variable-frequency centrifuge of tube and mould for new type well pipe is composed of variable-frequency control system, hydraulic system, pressure device, self-vibration wheel, tube and mould, hydraulic supporting and protection device, transmission device and motor etc. Transmission...

In order to effectively combat the act of electricity stealing which had long plagued power supply enterprises, it is essential to train power consumption inspectors on that act of electricity stealing in theory and form. This paper first illustrates the importance and technical difficulties of anti-electricity...

The purpose of this paper is to propose a mixed integer programming model of service restoration reconfiguration considering the minimum switching frequency and power losses. The recovery after the service failure of distribution network is a multi-objective optimization problem with constraints. This...

By analyzing of typical op-amp differentiator circuit considered the op-amp amplitude-frequency characteristic, we give out a design of sine-wave oscillator based on an improved op-amp differentiator. This oscillator is not only the output sine wave harmonic distortion very low, but also easy to design...

At present, the application of gas insulated metal enclosed switchgear (GIS) in power system is used more and more widely, but the detection of GIS is often disturbed by various kinds of noise, which affects the effective location of the fault point. Commonly it can not reflect the frequency characteristics...

Electromechanical integrated toroidal drive is a new-style composite drive, it integrates power and drive function. The mathematic models in coordinate system of the drive were derived based on the operating principle of the drive. In order to improve the controllability of toroidal drive, a vector control...

The result of cycle quadratic function waveform Chen-Mobius transformation is applied to voice communication system. We compute the two classes of mutually orthogonal sets of functions then we took them as a new type of modulation and demodulation function, and we found itself these two functions are...

Lightning electromagnetic pulse is strong electromagnetic interference sources, along with the rapid development of information technology, it has all kinds of hazards of electrical and electronic equipment, communications equipment becoming more serious; interference with normal radio communications...