In view of the late start of the research on switched flux permanent magnet motors, as well as insufficient discussion of the structure and characteristics, a new structure of E-type stator switching flux permanent magnet synchronous motor is proposed and the mathematical model of the motor is established, the structure is designed and the parameters are calculated. Through simulation analysis and cost calculation of U-type and E-type topology switched flux permanent magnet motors, the performance is compared with the existing U-type stator structure. The results show that the output torque of the E-type stator structure is 37.54 % lower than that of the U-type stator structure, and the motor cost is reduced by 13.41 %.
This paper combines the characteristics of task assignment of conventional missile launch to establish a model, finds the shortest path set from the starting point to the launch point based on Dijkstra algorithm, and obtains the shortest and most reasonable path of missile force transportation by establishing 0-1 integer planning. The total shortest exposure time for the combat troops to complete two wave launch missions has also been derived. It has solved the problem of motorized transportation of missile units and improved the combat efficiency of missile operations.
Based on the force analysis of the reinforced concrete beam with steel truss by ABAQUS , and compared with the experiment results , the simulation matches well with experiments , which proves the feasibility of the finite element analysis .Some changes are made about the area of the oblique abdominal rod to discuss the influence on ultimate bearing capacity .It shows that the ultimate bearing capacity is increased gradually with the increase of the oblique abdominal rod ..Through the simulation results , the formula of ulti-mate flexural bearing capacity of the reinforced concrete beam with steel truss are derived when the oblique ab -dominal rod is considered .The revised calculation results are compared with experiment results , and it shows that calculation precision is greatly improved .
To realize the automation and intelligent management of greenhouse,an environment monitoring system of greenhouse based on micro UAV has been designed. PC works as the control center of monitoring system. The system collects environmental data and obtains crop growth status via a variety of sensors and micro unmanned aerial vehicle. And then these data will be transmitted through the wireless transceiver module CC2430 and GPRS network. Finally,collected data will eventually be displayed on the PC. The system is combined Zig Bee wireless network with micro uav acquisition module,achieving real-time monitoring of the greenhouse crop growth status.
This paper examines a supply chain consisting of a supplier and a retailer,and builds a mathematical model through the introduction of the price of product,the level of quality effort and the degree of risk aversion,which is to meet the profit maximization between suppler and retailer. Thus the most excellent revenue distribution contract is drawn. In addition,what are also analyzed in the study are the influences of price response to the market demand,level of quality effort response to the market demand,risk aversion of supplier,variance of uncertainties and effort cost coefficient on revenue distribution contract. Finally,more intuitive results are obtained by numerical simulation.
For the purpose of water‐saving irrigation ,a set of the sprinkler irrigation control system was designed based on power line carrier communication .The system could get the field signal and control the actuator with master‐slave multicomputer communication mode based on power line carrier communication means ,and the host on the control centre room was as the core .Finally ,the system test had been carried out .Results showed that the error rate was low ,and the data transmission e‐quipment operation was reliable and stable .The control distance reached about 300 m long .The sys‐tem not only achieves the control purpose ,saves the water resources ,but also saves a large amount of communication cable ,and has very good application value .
With the rapid development of modern manufacturing technology,traditional manual,hydraulic and pneumatic clamping fixture cannot meet the requirements of industrial manufacture day by day.The fixture is developing toward energy-saving,environment-friendly with high efficiency and flexibility. For this reason,we have designed an economical and environmental gas-liquid composite fixture. Then,the working mechanism and basic structural characteristics are analyzed,and the formula of output force and displacement are derived. The fixture uses compressed air as power source,and the output force can be magnified 2times through the angle function between toggles and the area effect of hydromantic. It is of flexible structure,low cost and environmental protection,fits with the green manufacturing idea,and can solve problems of traditional fixture with small claming force and low working efficiency.
Based on the structural feature of the retaining wall template,we use plate and shell theory of finite element method( FEM) on the complex structure buttressed retaining wall template for the design and optimization of the related research. On the optimization model of the rod position,through the location layout optimization,we make the template deformation reduced 39%. Through calculation,we have drawn the template curves showing the relationship between the maximum deformation and the thickness of plate and the distribution of the stress component templates panel. This paper can also provide a reference for other thin-walled structure optimization design and parameter calculation. It also shows that finite element method proves to be of great value in improving the safety,reliability and reducing cost in penal desing.
To date,vitamin D receptors( VDRs) from mammalian and avian have been studied extensively,but little is known about VDR in lower vertebrate species such as amphibians and fishes. In this study,bullfrog and zebrafish were chosen as the representatives of amphibians and fishes,the bullfrog duodenum,bullfrog kidney and zebrafish intestine were collected as potential target tissues for VDR detection. After protein extraction from the selected tissues,the tissue distribution of VDR was detected by immunoblotting,and the experimental conditions were optimized in the experiment. This study will provide the valuable technical support for VDR studies of amphibians and fishes,and promote advances in research of the related fields.
With a clear understanding of measurement tasks,this paper studied the working principle of photoelectric encoder and method of Fourfold Frequency processing of the output signal. Based on this,a simulation analysis was made of the original signal and fourfold frequency signal by Proteus software so as to provide a sufficient basis for selection of hardware circuit components. And then a hardware detection system was constructed,using the AT89S52 single chip microcomputer as the main control unit and a photoelectric encoder as the front sensor,plus Fourfold Frequency processing circuit,and selecting LCD( liquid crystal display) to display measurement results,acquire signals and process data. The circuit of hardware detection system was simple in structure and low in cost.
Pallet is the key power transmission component of weighing sensor error calibration device,and satisfying the stress and strain limiting condition is the basis to guarantee the quality of calibration. This paper builds 3D model by UG based on the pallet of weighing sensor error calibration device,and obtains the distribution of stress and deformation of the pallet with finite element analysis software and method. Then the paper exercises optimal design under ANSYS Workbench according to analysis results and gets the relationship between input parameters and stress,strain and quality. And it selects the optimal input parameters on this basis. The final result shows that optimization method could decrease by about 7% quality of the pallet.
The paper makes an analysis of the heating load of solar energy in buildings in Yushu district with De ST software. The results show that the modified architecture has remarkable energy saving effect,energy-saving rate being 24%,27% and 31% respectively when room temperature is at 18 ℃,16 ℃,and14 ℃. Meanwhile,with Poly Sun software,the paper analyzes the energy saving of the solar heating system including the solar collector performance,system scale,installing angle,water tank volume,geographical position,geographical location,etc. The results of the analysis provide technical support for the popularization of solar heating system.
For the expansion of traditional music player function , multi-functional media player was de-signed, which uses STM32F103VCT6 micro controller as the core device .The hardware circuit of the system is composed of MCU, TFT color touch screen, temperature sensor, EEPROM chip, Flash chip, audio decoder chip and SD card modules etc .the system software is compiled in Keil MDK design platform by the TFT LCD driver , ADS7846 touch driver , VS1003 audio decoder driver , SD card reader driver , music playback function program and other related functional program composition .Experimental results show that: the media player can achieve MP3 music player and track lyrics spectrum information of color display , and has multiple func-tions of clock temperature display , e-books, picture browsing and drawing board .
To resolve the shortcomings of Boost capacity inadequacy by the traditional Boost converter,the study puts forward a new Interleaved Boost converter. Based on the traditional one,the new high-gain boost converter combines the operating characteristics of the capacitor charging and the features of staggered parallel structure with small output ripple and simple circuit structure. The paper analyzes the working principle of the converter and uses the software Saber to simulate and analyze the converter. The result shows that this new high-gain Boost converter has many advantages like high gain,low ripple,high efficiency,small size,and it verifies the correctness of theoretical analysis.
6-methylene progesterone acetate was characterized by NMR,IR,UV,MS,TLC and elemental analysis on the basis of detailed spectroscopic analysis,its molecular configuration,conformation and crystal structure was also elucidated by X-ray structure analysis. The crystal of 6-methylene progesterone acetate belongs to monoclinic crystallographic system,space group P2( 1),and unit cell parameters: a =1. 123 7( 14) nm,b = 0. 997 6( 13) nm,c = 1. 887( 2) nm,α = γ = 90. 00°,β = 90. 387°,V =2. 116( 5) nm3,Dc= 1. 207 mg / m3,Z = 4,F( 000) = 823.
In this study,bone marrow-derived mesenchymal stem cells( BM-MSCs) were isolated from Sprague-Dawley( SD) rat by using the whole bone marrow adherence method. To identify their osteogenic differentiation potential,BM-MSCs were cultured in osteogenic medium. Alkaline phosphatase staining was performed on the 7th day and there are alkaline phosphatase positive cells,and Alizarin Red S( ARS) staining was performed on the 21 st day and bone nodules formation showed up. To identify their adipogenic differentiation potential,BM-MSCs were cultured in adipogenic induction medium,then switched in adipogenic maintenance medium,and on the 10 th day oil red O staining showed lipid drop formation. It indicates that rat BMMSCs with multiple differentiation potential have been successfully isolated from SD rat bone marrow,which lays a foundation for the clinic and research using rat BM-MSCs as seed cells.
The author has studied the breeding of Microhyla mixture in the north of Yangxian county by the integrated approach between field investigation and laboratory from March 2013 to October 2014.The re-sults show that rice field is the habitat for frogs.Microhyla mixtura is closely associated with rice field in spaw-ning and tadpoles life period.The survival rate for frogs from egg to young frog is very low, being only 3%. The factors affecting the survival rate of frog reproduction include water source, dredging, pesticides, fishing, water quality and natural enemies, in descending order.Frog eggs are raised by artificial method, and then re-leased into the field, a protective measure is supported by experimental data.
The Wiener index of a connected graph G is the sum of distance between all unordered pairs of vertices in G,that is W( G) = Σ{ u,v} V(G)d( u,v). The paper studies Wiener index of bicyclic graphs Gr,t which has arbitrarily large diameter. It proves that Gr,tmeets the properties W( Gr,t) = W( L( G_(r,t))),where L(G_(r,t)) is the line graphs of G_(r,t).
Among the syrphids samples collected from Lishan Natural Reserve as part of an ongoing sur-vey of Syrphids fauna in Shanxi Province, 107 species, 47 genera and 11 tribes in three subfamilies of Syrphi-dae were recognized, in which 69 species and 30 genera of 4 tribes were identified to belong to the biggest subfamily Syrphinae, 37 species and 16 genera of 6 tribes were Eristalinae, and only one species from Mier-odontinae.Among them, one species, Spilomyia manicata ( Rondani, 1865 ) , was recorded from China for the first time, 64 species were newly recorded to Shanxi Province, and 7 species were undefined.The records of Syrphidae in Shanxi Province reached 159 species according to the survey.Based on the analysis of 100 known species and 47 genera in the fauna of Syrphids from Lishan Natural Reserve, the results showed that Palaearctic region and Oriental region were predominant, and elements of Palaeretic species were slightly more abundant than those of Oriental species.According to the distributional types, the subfamily Syrphinae multi-zoogeographical genera are predominant (70.21%), while the proportion of single-zoogeographical genera is relatively low.The results showed that the fauna of Syrphids of the Lishan Natural Reserve in Shanxi Province is transitional and complex.
The microstructure and the corrosion resistance of hot dip Zn-0.5Al-1.5Mg,Zn-2Al-1.5Mg and Zn-2Al-1.5Mg-0.3Si alloy coatings were comparatively investigated.The composition phases and the mi-crostructures of coatings were analyzed by X-ray diffractometer,scanning electron microscope and energy dis-persive spectrometer.The corrosion resistance of coatings was characterized by full immersion corrosion and neutral salt spray test.The results indicate that the Zn-Al-Mg and Zn-Al-Mg-Si alloy coatings are mainly com-posed of Zn phase,Al phase and MgZn2 phase, the Zn+MgZn2 eutectic and Zn+Al+MgZn2 eutectic were found in alloy coatings, the element of Al and Si can refine the grain size, adding Si in the Zn-Al-Mg alloy bath can enhance alloy coatings’ resistance to corrosion.
