Advanced Materials Research Vols. 503-504

Abstract: Thermal lens microscope (TLM) coupled to lab-on-chip chemistry in microfluidic systems is a powerful tool for analyzing a variety of compounds. However, the limited range of emission lines of laser-based TLM severely restricted the specificity of this technique and therefore limited the use of such TLM systems for practical applications. Here, a broad-band incoherent light source was introduced into the TLM to improve the specificity. A three-layer theoretical model was built. Through numerical simulation, it was found that at usual sample length of 100 μm in micro-volumes, the sensitivity can be increased by approximately one order of magnitude at low frequencies when the top and bottom layers are organic solvents. The sensitivity is even higher than that in laser excitation case.

Abstract: Proton exchange membrane fuel cell (PEMFC) is considered a promising energy generation device. Testing is critical for evaluating the performance and durability of PEMFC stacks. In this paper, a PEMFC testing system was designed and developed, which consisted of hydrogen fueling subsystem, air supplying subsystem, cooling subsystem, and control subsystem. The operation conditions were optimized through a series of experiments. Test was taken with a 47-cell PEMFC stack, and the system efficiency reached 44% when the stack output power was 4.2kW.

Abstract: This paper deals with the problem of fault detection for Markov jump systems (MJSs) with time-varying delays and partly unknown transition probabilities. The aim of this paper is to design a fault detection filter such that the filtering error system is stochastically asymptotically stable with an attenuation level. By using the Lyapunov-Krasovskii functional, a sufficient condition for the existence of the desired fault detection filter is formulated in terms of linear matrix inequalities. A numerical example is given to illustrate the effectiveness of the proposed main results.

Abstract: Under the precondition of keeping the original control circuit’s all control functions and not adding any electrical components, we make necessary improvements to the control circuit aiming at the two problems existing in the lathe main motor control circuit. The improved control circuit is more safe and reliable, the control functions is more perfect.

Abstract: There are many parameters that be used to represent typical breath flow, mainly divided into three types: one is temporal, the second is frequency, and the last is pressure driven model. The temporal parameters include breath period, tidal volume, inspiration expiration ratio, and functional residual volume, to name a few. The frequency parameters mainly include every harmonic content variation. The pressure driven model use mechanical parameters to calculate flow. All the methods above have one common disadvantage: they do not take variation into account. We proposed here that the fourth type parameter should be also used to describe flow pattern, namely fractal parameter, fractal dimension of breath flow signal. The necessity and advantage of the fractal parameter is elucidated. The fractal dimension parameter is optional because of its stability compared with other parameters.

Abstract: The computer techniques are used in the processing of the defects images of weft knitted fabrics in this paper. First, the fabric defects images are collected, and are pretreated in order to be seen more clearly. Then the classification and the extraction of characteristic value of the defects are introduced on the basis of researching anglicizing of the pretreated images, and reaching the purpose of identifying the defects types of weft knitted fabrics.

Abstract: Aiming at wireless sensor network technology be imported to the mechanical equipment failure monitoring system, firstly introduce the characteristics of the wireless sensor network technology, and design a kind of wireless equipment vibration data acquisition node, Put forward the whole scheme for node. The most important to be introduced is the choice of the sensor, the core processor and communications chip and the design of hardware electrocircuit, finally give the software design of the data acquisition node.

Abstract: The high pressure turbine clearance control valve (HPTACCV) fuel leakage on CFM56-5B engine can cause some flight delays and cancellations. The basic structure of HPTACCV is introduced. The root cause of the fuel leakage is given. In the field, to provide a more reliable engine, Weibull Analysis can be used to determine the soft time. This paper presents how to use Weibull Distribution to calculate the soft time life and forecast the spare parts equipments. This method can be used to evaluate the other failures of the aero engine components.

Abstract: In view of static wireless sensor node deployment efficiency low and dynamic wireless sensor node deployment non-uniform question, proposed based on a sensation environment object minute bunch with the motion proxy node gathering data method, effectively solves wireless sensor node deployment energy management and data collection and so on crucial the technical difficult problems, thus enhances the wireless sensor network the application value

Abstract: A testing system for the outdoor fitness equipment has been developed, which conforms to the new national standard. It can be applied to fatigue performance test, stability test and impact deformation test. Using Omron CPM2A PLC, the system guarantees industrial-level reliability. Measurement data is acquired and subsequently transmitted to PC via Host Link protocol. Developed in C#, the monitoring program applies a dedicated measurement thread. Attention has been paid to the assignment of PLC data memory. Therefore improved performance in speed can be achieved.