Advanced Materials Research Vols. 622-623

Abstract: In this paper, a comparative study of temperature effect which introduces a thermionic current under a high applied electric field, on three different modes of field emission current, such as Tunneling current, Fowler-Nordheim current and Field emission current in between these two regions has been done. Moreover, an idea of micromechanical displacement sensor with high sensitivity, operating in Fowler-Nordheim current mode, has been proposed. The displacement sensitivity of proposed sensor in Fowler-Nordheim current domain is about 10-9 m/A. The displacement sensitivity has been shifted from its expected value due to thermal effect (at 700K temperature) at about 1010V/m applied electric field across tip gap.

Abstract: Conventional methods to determine measuring instrument fitness for use or at time refers to accuracy of measuring instrument include adopt the accuracy of measuring instrument derives from the specification of the instrument itself, or error of reading from calibration certificate or multiples of resolution and some even consider calibration renders fitness for use. The common weaknesses of these conventional methods do not take into consideration of measurement uncertainty and measurement requirements. This paper researches into an alternative method in line with recent development in metrology as well as users requirements. It not only taking measurement cost into consideration, also meets the requirement of ISO QMS measuring instrument management requirements.

Abstract: A blade pitch angle sensitivity of wind turbine can be used to design a PID pitch controller. However, it is not simple to get a blade pitch angle sensitivity of wind turbine , becuase it depends on not only a blade-pitch angle but also wind speed. This paper suggests the analytical method of determining a blade pitch angle sensitivity. Finally, examples have been simulated to evaluate the proposed method in this paper.

Abstract: The ionic liquids used in this study are (1,1’-decane-1,10-diylbis (3-ethylpyridinium) dibromide. The reason of this experiment is to figure out character of ionic liquids called green solvent. It can help to use of ILs to know that specific feature since ionic liquids are made so many different way. Using maximum bubble pressure method, we tested dynamic surface tension in range of 298K~418K and time range is 0.03s~60s. Among various method of inspecting dynamic surface tension, maximum bubble pressure is the easiest way to have such description of the solution at air/water interface. In the short time, it show only diffusion model, but in the long time range there is different aspect which it called diffusion-controlled model

Abstract: Over the last several years, many concrete tunnels have been constructed for roads, highways, and railways. For safety in concrete tunnel, periodic inspection has been conducted using many testing technologies and techniques. However, these technologies cannot replace visual inspection because of their slow and complicated procedures. For this reason, the Knowledge-Based Systems (KBS) are used to diagnose R.C tunnel lining crack damage (DICRCTL). In this paper, we attempt to propose an alternative to the human expert, to give technical decisions in diagnosing crack damages in second segment of R.C. tunnel lining. To overcome this requirement, an expert system is developed to achieve the research aim. This proposed system was constructed on a knowledge base that incorporates with the gathered information in the form of rules which is suitable to implement in an expert system environment to diagnostic advisory nature. The proposed application results show an easy, fast and satisfactory answer to engineering needs.

Abstract: This paper presents a real-time pollution monitoring model of convection heating surfaces based on coal online soft sensing, This model reality the optimization calculation of clean factor and get the information of coal moisture, ash content and ultimate only according to the existing measuring points and data in the Distributed Control System (DCS) of thermal power plants, no need to use additional equipment. Used this technique in 1000MW power units and the result shows that, the computational accuracy of clean factor has greatly improved, which will correct the boiler blowing operation.

Abstract: Referred to the problem a manufacturer always faces that bottles in a casket are missing, caused by the bottles leaning down. Checking the parceling by human causes high risk from the explosion of the lean-down bottles. So this article presents how computer vision is applied to the inspection system. The system used a low-price webcam and image processing method to identify the defection. The process begins with adjusting HSV up before working on edge detection to reduce density of data. Then cross correlation as template matching to define the bottles and check the number of soda bottles. This system can identify 84% of completely loaded casket and 100% of the missing loaded casket.

Abstract: In recent years, in order to achieve a stable and efficient output, the research about the method of efficient controlling has become a significant and popular research topic in the academic field. In this paper, a novel electromagnetic transient model of photovoltaic cells is proposed and established with the method of Maximum Power Point Tracking (MPPT) and forward-feed controll. Dynamic simulation proves that the model can reflect working situation of the photovoltaic systems correctly under different environment parameters.

Abstract: The influence of contact thickness on electrical performance of bottom gate Organic Field Effect Transistor (BG-OFET) with staggered and planer structures is studied in this paper. Two dimensional device simulation is performed with identical dimensions for both devices which show a good agreement between simulated and measured results. Contact thickness is varied from 0nm to 20nm for planer and staggered structures. The electrical characteristics are strongly affected by the contact thickness variation. With increasing contact thickness, the threshold voltage shifts from negative to positive. The simulation results indicate that saturation current value of staggered structure is higher than that of planer. Although the current does not increase in staggered structure due to its increasing contact thickness, while the current in planer structure increases up to three times. However, current in planer is still below the current in staggered structure. The extracted field effect mobility and current on-off ratio at 20nm electrode thickness for staggered structure is 0.67 cm²/V.s and 10⁸, respectively. It has been observed that the field effect mobility, threshold voltage, sub-threshold slope, transconductance and current on-off ratio can be modified by varying contact thickness. Analysis of the results clearly demonstrates the significance of controlling the contact thickness in planer and staggered OFETs. It even offers a way to control OFETs parameters.

Abstract: Due to the analysis and research the of the Traffic Safety Management, faced with the problems of scattered business application systems, fully integrated business data resources and inter-departmental information sharing, and based on the existed OBAC Access Control Model, this study has proposed a dynamic trust-based information systems interoperable access control technology, provided technical support to solve the interoperability of information between inter-departmental access.