Search

The temperature and magnetic field data acquisition system is developed for HTS Magnet of ITER. According to its working environment, the type of probes used for detection and the corresponding supporting equipment are chosen. Based on the requirements of data acquisition precision, the selection of the data acquisition instruments is completed. Optimize the number and configuration of probes and keep key monitoring on its Conduction-cooled structure. A complete set of complete data collection and human-computer interaction system is designed by using LabVIEW.

High temperature superconducting (HTS) cable termination is an important component of the HTS cable system, which functions to connect the HTS cable and the conventional cable accessory. The stress cones of the HTS cable termination can improve the internal electric field distribution and the electrical insulation strength of the cable termination. In this paper, the mathematical model and equivalent circuit model of the stress cones are built and the genetic algorithm is adopted to the design of 110-kV HTS cable terminal stress cone. The capacitance, radial electric field, axial electric field, voltage, insulation thickness and other parameters of the stress cone were compared before and after the optimization of the stress cone. Finally, the simulations of the stress cone with the optimized structure were made using finite-element analysis software COMSOL to test the optimization result.

Compared with the conventional transformer, high temperature superconducting (HTS) transformer can effectively improve the efficiency of the system. The current lead of HTS transformer is a main part that leads to leak out heat, and its thermal leakage loss greatly influents the performance of cryogenic system. So it is important to design and optimize the current lead. In this paper, the current lead of a 50MVA HTS transformer is designed, depended on the calculated conclusion of temperature field with FEM method, the optimization of the current lead is carried out to decrease heat losses.

Taking a rise steel as a study, study response of the structure to the dynamic characteristics under fluctuating wind load. The results showed that: deformation of structure under the fluctuating wind load is shear deformation; Structural displacement response curve is similar to the curve of the pressure time history. Because of consider different heights the structure of spatial correlation affect, Displacement positions on different floors response curves are differ.

In consider of construction characteristics of drilling bitten pile in Kunming metro engineering, this paper study on preparation and performance of super retarded concrete. Meanwhile, this paper find appropriate raw materials and mixing amount, which can meet construction requirement of high flowability and long setting time for this engineering. Combined theory with experiments, it lay the foundation of popularization and application of super retarded concrete to find the influence law of performance of super retarded concrete by mixing amount of all materials.

The AC loss calculation is crucial for the thermal analysis of the High Temperature Superconducting (HTS) magnet. Generally, the critical state model is used to calculate the AC loss value of the HTS conductor with Finite Element Method (FEM). The mesh of the model have a large impact both on the convergence and the accuracy in calculation processes. In this paper, we investigate the effect of different meshes on the AC loss calculation of HTS conductors using a second generation tape model. Both triangular and quadrangle element with fix number of elements and predefined distribution type meshes have been used. The results illustrates that quadrangle with geometric sequence is the best choice when calculating the AC loss in HTS tape.

Used electrochemical tests and the natural atmospheric exposure experiment to study initial atmospheric corrosion of 2cr13 steel in Guiyang city . Measured impedance spectrum curves and polarization curves of experimental steel in the local rain medium.Weight method measured the corrosion rate. The results showed that the exposure period of 0 to 60 days, with longer time, the corrosion current increased firstly then decreased, and the corrosion current decreased after the firstly increased. Impedance spectra showed that passivation process was controlled by the electrochemical reaction. Measured the corrosion rate of 0.000280 ~ 0.000280 mm/a, which belongs to the corrosion level 2 - very corrosion resistance.

Due to the high current density in 77K, the high temperature superconducting facilities are expected to improve the efficient in power transmission. Superconducting facilities electromagnetic design is highly dependent on the characteristic of the superconducting tape. As a result, the comparison of the effect of different tape in electromagnetic design should be studied. In this paper, several facilities model are used as example to analyze the effect of different tape utilization. The result shows in different application conditions, or, specific benefits are considered, there is a specific tape will be the best choice.

This research was mainly on morphology observation of syrphid common species including Episyrphus balteatus, Eristalis latréillè, Eupeodes osten, and Melanostoma schiner. Observations of four species of syrphid morphological characteristics in Shenyang were of the first radial cell area (R1), the third radial cell area (R3), the fifth radial cell area (R5), the second median cell area (M2), the first anal cell area (1A), spurious vein and wing length. The results showed that the first radial cells area, the third radial cells area, the fifth radial cell area, the second median cells area, the first cell area and wing length of M. schiner were the minimum, and spurious vein length was the maximum. The first radial cell area of E. latréillè was larger than that in other three species. The first radial cell area of E. latréillè was larger than that in other three species. The third radial cell area, the fifth radial cell area and the second median cell area of E. balteatus were larger than that in other three species. The wing length of E. osten was longer than that in other three species. Significance test showed that syrphid wings of the same individual from the four species had no significant differences.

Saturable magnetic circuit is a common phenomenon in power system. It can lead to waveform distortion, coefficient of self-inductance decrease and measurement error increase. So establishing a mathematical model for saturable magnetic circuit and revealing the mathematical relationships in saturable phenomenon. It is helpful to reliable and safe operation of power system. This paper base on double expontential function fitting algorithm and simplex algorithm to establish the function relationship between relative permeability and magnetic field intensity. Applying for the model,we can obtain the waveform of magnetic flux in transformer core and transformer voltage waveform. The research has certain significance in the abstract and foreground in the application for the study of saturable phenomenon.

The power equipments made of high-temperature superconductor (HTS) widely applied in power system in the recent years. A HTS adjustable reactor (HTS-AR) is a novel controllable reactor with the controllable windings made of HTS tapes. Shunt HTS-AR can regulate the reactive power of power and reduce the transmission loss. However, the leakage magnetic flux of the superconducting windings is relatively large, which may restrict the application of the HTS-AR in high-voltage transmission line. Basing on the research of the structure design for HTS winding, the characteristic analysis of magnetic and AC loss of HTS-AR with considering the structure of superconducting winding is shown in this study. The results show that the HTS winding with the ladder-like structure has a better performance compares with HTS winding with the solenoid structure.

In high temperature superconducting (HTS) magnet design, it well known that the critical current (Ic) is sensitive to the direction of the local magnetic field. The perpendicular magnetic field component to the face of tape have a larger effect on the Icof a HTS tape than the parallel component. Thus in HTS magnet design, the magnetic field distribution is the first considering factor. This work presents a HTS magnet design using genetic algorithm to obtain the object. When the length of the tape is certain, the results show that the process gives the optimal number of the double pancake and the inner radius of the magnet.

The strong and specific binding of two DNA cytosine bases by silver ion (C-Ag+-C) was applied to develop an efficient electrochemical biosensor for the detection of silver ion in aqueous solution. As a redox indicator, the hydrogen peroxide worked to generate a readable electrochemical signal. Thiolated short oligonucleotide strands containing 5 cytosine bases served as probe and self-assembled via AuS bonding on gold electrode. In the presence of Ag+, the specific coordination between Ag+ and cytosine bases resulted in more stable and porous arrangement of oligonucleotide strands. Hydrogen peroxide could adsorb onto the surface of gold electrode and produce an electrochemical signal. The cyclic voltammetry shows a linear correlation between the signal and the concentration of Ag+ over the range 0-0.2 μM (R2 = 0.9955) with a detection limit of 30 nM. The length of probe DNA has no significant impact on the sensor performance. This biosensor is simple, economical and reusable with good sensitivity and selectivity. We also validated the practicality for the determination of Ag+ in real water samples.

Total generation amount of scrap tires in China and the U.S. reach 500 million and total weights are about 10 million tons. Management on scrap tires is the common challenges for both countries. In this paper, generation situations, material flows and management policies of the two countries were analyzed and compared. Comparison results show higher possession of private vehicles and higher retreading ratio for commercial trucks in the U.S. results in relatively higher generation amounts (0.3billion units) and relatively lighter weights (4.4 million tons). Management policies on scrap tires in the U.S. are more comprehensive and stricter than those in China. The successful implementation of economic instruments in the U.S provides practical experiences for China to improve material flows and avoid illegally oil refining. In the U.S. co-disposed as an alternative fuel is the main outlet for scrap tires, while in China they are mainly recycled to produce reclaimed rubber.

Based on a case study of Jilin province in Northeast China, this paper applied input-output analysis method to contrast different effects of wind power and thermal power generation on local economic growth. The results indicate that the driving effect of wind power on economic growth in the output of per ten thousand Yuan is lower 5205 Yuan than that of thermal power. However, taking serious environmental externalities produced by thermal power generation into account, thermal power economic value will be greatly decreased.

Today, near-infrared (NIR) has been proved to be a powerful analytical tool. It has been applied widely in agricultural, petrochemical, textile and pharmaceutical industries. In this paper, near-infrared spectroscopy (NIRS) combined with partical least square (PLS) was used as a qualitative tool to rapidly determinate two active components in Fructus Corni. The PLS calibration model of NIR Spectroscopy, the correlation coefficients (R2) of Loganin and Morroniside were 0.95895 and 0.98450, the root-mean-square error of cross-validation (RMSECV), the Correction of deviation, the prediction mean square error was 0.0344,0.109;0.0625, 0.2641 and 0.0948, 0.233. The result shows that, the near-infrared Reflectance Spectroscopy could be used to determinate the content of Loganin and Morroniside, and meanwhile as a simple and rapid new method for the quality assessment of Fructus Corni. In addition, the NIRS has a unique advantage in the quality control of traditional Chinese Medicine (TCM), such as rapid, accurate, nondestructive and no pollution. It is expected to be further uses in the quality control of TCM. It is can achieve the requirement of rapid detection of large quantities of Fructus Corni.

The heights of fully-mechanized mining water-flowing fracture zone of Yanzhou mining area were measured by borehole simple hydrology method .In order to confirm the influence degree of the geology and mining factors to the damage height of overburden rock , the paper analyses the measured data by using grey relation analysis theory, and concludes that the face span, mining thickness and mining depth are main influence factors to the height of the water-flowing fracture zone. On this basis, the paper reveals the general rules of fully-mechanized caving mining overburden rock destruction with the on conditions of gentle dip, thick coal seam and hard and medium hard roof by using regression analysis method.

Supported rare earth double perovskite (La2MnNiO6) oxide catalysts were prepared by incipient wet impregnation method for methane catalytic combustion, and effects of the support (Al2O3, ZrO2 and MgO) were investigated. The loaded catalysts were characterized by means of XRD, TPR, SEM techniques and their catalytic activities were tested by complete methane oxidation. Depending on the different oxide carrier (e.g. Al2O3, MgO and ZrO2), catalysts have different catalytic properties, because the interaction of metal oxide-support will affect both redox property and dispersity of the active phase. The results on catalysts have shown that the dispersion on Al2O3 and MgO supports had an effect to enhance the catalytic performances of the catalysts that had been treated at 1100 oC. The activity of ZrO2 supported catalyst significantly decreases when calcination temperature at is 1100 oC. The dispersity of the active phase and the nature of the oxide carrier played an important role in the catalytic performance.

Aiming at high power consumption by auxiliaries of circulating fluidized bed (CFB) boiler, combustion tests were carried out on a 300MW inferior anthracite fired CFB boiler to decrease the bed material inventory via energy saving combustion technologies for CFB boiler based on fluidization reconstruction. The effects of fluidization reconstruction on boiler performance improvement were analyzed. Application practices show that after fluidization reconstruction, the power consumed by auxiliaries of the CFB boiler decreases obviously. Auxiliary power ratio of the 300MW boiler unit has been reduced from 6.1% to 4.3%. The erosion of boiler heating surface has been alleviated obviously.

In this paper, the new bamboo-based consolidated composite floors were fabricated with thin bamboo veneers which used as decoration layers, wear resistant layers, high density fiberboards and equilibrium layers through assembling and scuffing. The effect rules of the composite floor on properties were preliminarily studied by three factors: hot-pressing temperature, pressure and time. The results showed that the wear resistance and surface bond strength of the thin bamboo veneer consolidated composite floor significantly increased with the rise of hot-pressing temperature. In the scope of resources, the effect of hot-pressing pressure and time on properties of the floor is not significant. The optimizing technology is hot-pressing temperature 170°C, pressure 3MPa and time 40s/mm in this study. The thin bamboo veneer consolidated composite floor is an excellent floor decorative material, which has good physical and mechanical properties.

XPS analysis is used in studying surface chemical composition and structure of ultrafine raw Al powder and PVP/Al composite powder, respectively. It shows that: in PVP/Al composite powder’s surface, comparing with raw Al powder, relative content of Al decrease and relative contents of C and N increase. New chemical bonds are formed in PVP/Al composite powder’s surface, and it is certain that, these new chemical bonds derive from N atom and O atom of PVP’s pyrrole with Al atom in Al powder surface.

Soil surface electrochemical properties may have an important effect on soil fertility and genesis. Few researches are available on the changes of surface electrochemical properties of purple soils during the pedogenesis. In present work, four purple rocks and their derived soils under arable, orchard, forest and grass were collected to determine surface electrochemical properties including surface specific area, surface charge quantity, surface charge density, electric field strength, and surface potential using the kinetic method. The results indicated that soil surface specific area and surface charge quantity of soils were both significantly higher than their parent rocks. There were similar trends in surface potential, surface charge density and electric field strength of soils and parent rocks, soils derived from Shaximiao Formation (J2s) and Suining Formation (J3s) were higher than those of parent rocks, whereas the reverse trends existed in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p). At the same time, surface potential of soil samples collected from four sites with different land utilization, i.e., Arable, Orchard, Forest and Grass, were determined to illustrate the various trends of soil electrochemical properties change. Under different land use patterns, the descending orders of soil surface potential in Shaximiao Formation (J2s) and Suining Formation (J3s) were both as follows: orchard > forest > arable > grass; the order in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p) were as: orchard > forest > grass > arable. On the other hand, the value of soil surface charge quantity was increased with clay content and soil acidity because of the intensive physical weathering and slight chemical weathering. Therefore, the surface electrochemical properties may have some agreements with the weathering extent of the purple soils. Soil surface potential, surface charge quantity, surface charge density, electric field strength, and surface specific area could be employed as reference criteria for pedogenesis of purple soils.

The catalysts were prepared by the impregnation method and characterized thought X-ray powder diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), measurement of surface area, differial thermal and thermogravimetric analysis. Rare-earth compound oxides La 0.8Sr0.2CoO3 act as active component; Alumina act as carriers. The effects were investigated on loading amounts of active components, calcinations temperature and the addition components on the catalytic oxidation of xylene.

In the case of gas radial flowing in layer-though boring, use the method of draining water gathering gas measured the Gas flow of borehole that there is water flow out from drilling Sometimes,the coal seam gas permeability coefficient is calculated using"Radial Flow Method"and"Optimizing Method,found out the range of 5-3 original coal seam Hongmiao coal mine permeability coefficient is0.007~0.008 m2/(MPa2·d).

The dose calculation parameters of 103Pd radioactive seed need to be determined strictly before clinical application for tumor implanted treatment. The radial dose function and the anisotropy factor are data analyzed and nonlinear fitted based on the value of dose parameters in American Association of Physicists in Medicine (AAPM) TG-43 and TG-43U1 by Cftool and SFTool toolbox in Matlab. Result was selected according to the optimum principle of fitting accuracy that is the coefficient of determination is close to 1 and gets the minimum value of the sum of square of deviations in fitting process. The calculation of the radial dose function and the anisotropy factor result are obtained in an ideal situation, and then the dose calculation of 103Pd radioactive seed is determined. The calculation of 103Pd radioactive seed provides a theoretical basis for 103Pd implanted treatment of tumor in clinical.

Small diameter bamboo and bamboo processing residues were cut into particles; bamboo particles and bamboo mat were constructed into a composite mat; the composite mat was hot-pressed to form a composite board. A study was made of the hot-pressing process for bamboo mat bamboo particle composite boards, taking its hot-pressing time, hot-pressing temperature and glue consumption as the process variables. An analysis of the variance and regression of the test results shows that, among the three variables, glue consumption has the largest effect on every quality index of the product, hot-pressing time has less, and hot-pressing temperature has the least. Based on this, the optimal variables have been determined.Hot-pressing time is 70s/mm, hot-pressing temperature is 170 , and glue consumption is 12%. Prediction and verification of the variables show that these variables are reasonable and helpful in bettering product quality. Advantage of the presented technology was to make full use of character of bamboo mat and bamboo particle, and to raise the rate of bamboo utilization.