Search results

Real estate mass appraisal is the key preliminary work of imposing real estate tax in urban area.Various methods have been used for real estate mass appraisal,among which geographic information system(GIS) is a powerful method to improve the efficiency due to it’s capacity of spacial analysis and management.This article tries to explore the combination of GIS and Hedonic model,and uses GIS spacial analysis function to quantitative analysis influencing factors of real estate.At last we have a real estate mass appraisal practice on Xi’an,the result shows it is feasible and efficient to apply GIS in urban residential real estate mass appraisal.

The risk factors of continuous incremental launching bridge during construction stage are specialized. The risk in incremental launching stage is analyzed and identified. A risk assessment index system is built. A fuzzy comprehensive evaluation model is developed. The results obtained from the risk assessment model verifies the validity and practicality of the developed method by the combination of analytic hierarchy process and fuzzy mathematics theory. Moderate risk assessment results are developed to provide references for incremental launching construction method.

In order to solve the problem in k-means algorithm that inappropriate selection of initial clustering centers often causes clustering in local optimum and the time complexity is too high when handling large amounts of data, a fusion clustering algorithm based on geometry is proposed in this paper. The result of experiments shows this algorithm is better than the traditional k-means and the k-means++ algorithms, with higher quality and faster speed. And at last in this paper, we apply it in marine engineering.

In order to instruct on-site workers to accomplish the assembly job fast and exactly, improve the assembly quality and efficiency, we proposed a management method for assembly technical annotation in 3D assembly instruction. This method maps 3D technical annotations to assembly operation and assembly time based on time sequence granularity, achieves the goal of showing assembly technical annotations based on assembly process. We demonstrated the effectiveness of this method with a satellite antenna feed components assembly process instance. The instance shows that this method can mark assembly technical annotations based on assembly process, and show the annotations in time sequence but not in assembly space. This will help on-site assembly workers to understand the assembly order fast and unambiguously, finish the assembly operations correctly.

The halogenated hydrocarbon and pyridine are used in the synthesis of room temperature ionic liquid intermediates chlorinated N-butyl pyridine BPC, and the nuclear magnetic resonance instrument and the intermediate infrared spectrometer are used in chemical structure characterization, so it is determined that the synthesis is the room temperature ionic intermediates BPC. We use differential scanning calorimetric method for the determination of BPC melting point and enthalpy change. We use the double decomposition reaction of BPC and NaBF4 in acetone for the synthesis of BP-BF₄ ionic liquids. We use infrared spectrometer for the structure characterization, it is proved that we have gotten BP-BF₄ room temperature ionic liquids. Solvent polarity and acid alkali both will have an influence on ultraviolet spectrum diagram displacement of room temperature ionic liquid, so in the research of ultraviolet spectrum diagram of ionic liquids and other solvent mixed solution, it is necessary to indicate which solvent is used.

For the problems of the oversized voltage and undersized displacement in the electrostatic micro actuator of transverse loading recently, a silicon micro actuator model with characteristics of large-displacement and low-voltage is presented based on the principle of vertically-horizontally bending. The deflection equation of the micro actuator is derived. The axial static electricity, temperature stress and axial squeezing pressure on the deformation of micro-beam are analyzed. The simulation shows that the displacement is as big as 17.5μm when the driving voltage is as low as 5V. The displacement is much larger than the deformation of the current micro actuator.

The smart power consumption is an important orientation in peak load shifting and load shedding of power grid in particular time period. It has the significant effect to relieve the load shortage of the power grid. The large-scale electrical devices like central air-condition in commercial building have the great potential in the energy efficiency improvement and available load integration. The effectively regulation of power load in public and commercial construction can improve the stability and reliability of power grid. The power situation in china and the content of empirical study were introduced, and the system hardware design and software platform construction is demonstrated. The function modules of software platform and realization of regulation system are discussed in final.

As a necessary component in pneumatic muscle, minimum switch and minimum mechanical hand, pen cylinder used as prime actuator possesses the characteristics of high speed actuation possible, easy installation, improved wear resistance and so on. The construction and working principle of the pen cylinder are introduced. Using 3-D stress field finite element analysis (FEA) method, the stress field distribution of pen cylinder with preload in mounting nut is analyzed. Simulation results are presented. The stress characteristics are compared between different preload in mounting nut and thickness of mounting bracket.

Based on average loading assumption, a non-linear contact finite element model of coupling triple-diaphragm assembly configuration is established. In accordance with the result of diaphragm equivalent stress, the yield strength criterion and high cycle-stress fatigue life norm are adopted to calculate strength safety coefficient and fatigue life of coupling diaphragm. The durability of coupling diaphragm is proved enough numerically.

Manpower allocation determines the competence of the companies. Scientific manpower allocation calls for accurate evaluation on the abilities that the employees have for the posts. In this paper, we first present a general fuzzy clustering model for manpower evaluation for companies. To verify the approach, a new distance-based evaluation model is also presented. Simulation results demonstrated the accuracy of our research.