Search

Empty nest" is increasingly serious and jQuery Mobile (JQM) has become a mainstream UI framework for Mobile web development. According to which phenomenon, formulate 18 kinds of service items according to the practical needs of the old. Build modular interface by means of JQM, and then fill detailed function in each module combining with MySQL database. The content of the database includes service resources and information about the old, which need to be updated in real time. Realize foreground-background communication through SOCK_DGRAM. Results show that the platform can accomplish the prospective service for the old. This mode has low cost and strong scalability, and it is a new socialization care for the old platform which is clear to operate, supporting the use of resources and multi-party benefit.

A novel insulation monitoring method which can monitor the insulation resistance between both the positive and the negative electrode of the electric vehicle's battery pack and the vehicle's body is proposed. The insulation monitoring method proposed in this paper is deduced theoretically, and the hardware and software design of an insulation monitoring device based on this method is given. The experimental results prove the correctness of the insulation monitoring method and the practicability of the insulation monitoring device.

The interactions of bovine serum albumin (BSA) with phosphotungstic heteropoly acid (PW), silicon tungsten heteropoly acid (SiW) and silicon tungsten-cobalt acid (SiWCo) were studied by fluorescence spectroscopy and UV absorption spectroscopy at Tris buffer solution (pH = 7.40). It was found that the fluorescence quenching of PW, SiW and SiWCo with BSA was static and the binding constant, binding site and the thermodynamic parameters were calculated at 298 and 310K. In addition, the conformations of BSA impacted by PW, SiW and SiWCo were researched using synchronous fluorescence. The results showed that PW, SiW and SiWCo all could interact with BSA but they had not changed the conformation of BSA.

With the large-scale use of power battery pack, its security issues are attracting more attention, especially insulation faults. Traditional insulation monitoring methods can only detect insulation faults appeared at the most positive and negative ends of the battery pack, which cannot meet the requirements of monitoring the insulation state of an entire battery pack system. This paper analyzed the multi-point grounding insulation model of power battery pack, and obtained an equivalent model. A method of detecting the insulation resistance and locating the insulation fault was given, based on the equivalent model. The results of the simulation on Multisim 10.0 and the experiment test proved the correctness of the simplifying process of the insulation model and the insulation monitoring method.

This paper describes the structure of energy storage system in smart grid, and analyzes the battery management system applied in the energy storage system. Battery temperature’s acquisition mode and the anti interference measures are studied. A battery state-of-charge (SOC) estimation method using the extreme accelerate correction method is proposed and the method is feasible to ensure the accuracy of SOC estimation. A battery voltage failure threshold table is constituted by extracting the important experimental data, and the safe using of the battery can be ensured by querying the threshold table. Now the battery management system could meet the needs of the actual operation of the battery energy storage system.

The vibration of oil well sucker rod is one of the main reasons that cause breaking and disengaging to the pumping well. According to vibration mechanics theory and nonlinear theory, building the vibration mechanics model of the subsurface rod system, combined with finite element theory, using spatial beam element to establish the finite element of the rod. And according to the interface ingenerating conditions, adopt augmented Lagrange multiplier method to embed it into the finite element equations, tracing the contact friction state of the rod and tubing, to obtain the rod vibration characteristics and the contact state with the tubing during work process, to analyze the change law and influencing factors, providing the theoretical support to the vibration control of the rod.

Spontaneous combustion in coal goaf area is one of major disasters in coal mines. Detection technology based on signature Gas and Temperature is the primary means of spontaneous combustion forecasting of coal goaf area. A real-time remote fire detection system is proposed based on tunable diode laser absorption spectroscopy technology and FBG temperature sensing technology, to achieve valid detect of gas concentration and temperature. The System include fiber mathen concentration sensor and fiber temperature sensor based FBG. The system achieved remote on-line monitoring of gas concentration and temperature in mine goaf, meet the fire forecast need for Coal goaf area. There are obvious advantages Compared with the existing beam tube monitoring system in coal mine.

This document analyses the surface of piston in two aspects, discrete points of axial section profile are fitted by cubic spline tool of MATLAB, interpolate curve after fitting with method of precision linear approximation. Equipartition of cross section profile are done,and through subdivision of points of equipartition,to approach theory contour. the number of divide points must satisfy the request was made, with the principle of the relative movement，in the processing of cross section in an ellipse，detailed analysis the motion of line motor，pointed out how changes the speed and acceleration of workbench.and must satisfy the basic conditions of the line motor to respond to the turning of cross section in an ellipse. On this basis, design a lathe machining CNC system of piston with structure of upper and lower computer, moulding of surface of piston are completed by upper computer, feed drive of X, Z axis and spindle are completed by lower computer, surface of middle-convex and varying piston are processed finally.

GCr15 alloy produced by hot-forged is subjected to equal channel angular extrusion (ECAE) process at 950°C. The microstructure of GCr15 steel via ECAE and annealed is studied by an optical microscope. The effect of ECAE and annealing on the wear properties of the alloy is also investigated. The results show that the grain size reduced from 50 mm to 10 mm via one pass ECAE, and the hardness of the alloy is increased. The wear mass loss of the alloy is greatly reduced due to the grain-refinement after ECAE and annealing.