Advanced Materials Research Vols. 282-283

Abstract: A kind of ultra micro pressure range MEMS pressure sensor is elaborated and analyzed in detail. The chip structure selection of pressure sensor is researched by the relative theory and the reasonable chip structure is designed in this paper. In order to design the Wheatstone bridge properly, we explore the width and length of the resistors on the membrane of the pressure sensor. At last, through the finite element analysis method, the relevant dynamic properties are analyzed for the sensor too. The dynamic response time is 3.2×10^-5s. The response speed is fast and the sensor has many advantages under the periodic variation pressure.

Abstract: In this paper, one-dimensional parabolic equations is studied .A high accuracy method for solving one-dimensional parabolic equations is structured by choosing suitable parameters, its accuracy is better-then- third-order in time and space direction.

Abstract: In order to study the effect of RE on anti-corrosion mechanism, high Mg content Zn-Al-Mg and Zn-Al-Mg-RE (where RE is Rare Earth) alloy coatings were produced on low carbon steel substrates by using cored wires and arc spraying. The electrochemical impedance spectroscopy (EIS) was used to determine the anti-corrosion mechanism of the two coatings in 5% NaCl solution. The composition and structure of corrosion products on the coatings surface have been investigated after corrosion tests by X-ray diffractometer (XRD). The results show that, Zn-Al-Mg-RE coating has superior corrosion resistance compared to Zn-Al-Mg coating due to the formation of more compact and uniform corrosion products. The self-sealing effect of the Zn-Al-Mg-RE coatings, especially for longer immersion times is extremely good. The role of the RE elements appears to be associated with the self-sealing process and the refinement of the coating microstructure.

Abstract: This paper presents a general framework for the study of rough set approximation operators in vague environment in which both constructive and axiomatic approaches are used. In constructive approach, by means of a vague relation defined by us, a new pair of vague rough approximation operators is first defined. Also some properties about the approximation operators are then discussed. In axiomatic approach, an operator-oriented characterization of vague rough sets is proposed, that is, vague rough approximation operators are defined by axioms.

Abstract: As a suitable mathematical model to handle partial knowledge in data bases, rough set theory is emerging as a powerful theory and has been found its successive applications in the fields of artificial intelligence such as pattern recognition, machine learning, etc. In the paper, a vague relation is first defined, which is the extension of fuzzy relation. Then a new pair of lower and upper generalized rough approximation operators based on the vague relation is first proposed by us. Finally, the representations of vague rough approximation operators are presented.

Abstract: This paper investigates residual implication of interval-valued fuzzy triangle norm and its properties. Residual implication of interval-valued fuzzy triangle norm is first defined. Then the relation between residual implication of interval-valued fuzzy triangle norm and residual implication of triangle norm is established. Finally, some properties of residual implication of interval-valued fuzzy triangle norm are examined.

Abstract: The process of integration in the global economy driven by foreign business cycle fluctuations on China's economy has become increasingly evident. United States as the world's largest economy, the world economy has a significant impact, while the United States is China's most important trading partner, the most important foreign export market. From the close trade links between the two countries on the run, U.S. economic growth has an important role in China's economic development. Articles by examined the 1979-2010 China-US previous years, the operation of law of economic cycles and volatility characteristics of China and the U.S. business cycle synchronization features. Came to the conclusion, fluctuations in business cycle synchronization between the two countries occurred mainly after 2000 results.

Abstract: The paper introduces the principle and structure of adaptive filter based on LMS algorithm, studies a design scheme of a single frequency adaptive notch filter, and simulates its working procedure by using the Simulink simulation tool. The simulation results show that the adaptive notch filter based on LMS algorithm has the better convergence and the smaller steady-state error than traditional notch filter in the appropriate parameter.

Abstract: After consulting a large number of literature and experts, survey to the present situation of sports dance teaching methods that P.E. teachers used in the senior high school is not efficient. The author is deeply impressed that sports dance teaching in the multimedia environment provides conditions for students to establish action representation, arouse students' learning passion and enthusiasm, emphasize students` subjective dynamic role and cultivate students' self-confidence to complete the right technology action with the strong will and the ability. This paper raises that sports dance teacher should choose the best way which can achieve the teaching purpose and finish the teaching task in terms of the different teaching content stages and different levels of students， compounding the traditional and advanced multimedia technology organically. This study provides the theoretical basis and method reference in order to promote common college sports dance teaching method theory and teaching practice.

Abstract: Any one who knows the signer’s public key can verify the validity of a given signature in partially blind signature schemes. This verifying universality may be used by cheats if the signed message is sensitive or personal. To solve this problem, a new convertible user designating confirmer partially blind signature, in which only the designated confirmer (designated by the user) and the user can verify and confirm the validity of given signatures and convert given signatures into publicly verifiable ones, is proposed. Compared with Huang et al.’s scheme, the signature size is shortened about 25% and the computation quantity is reduced about 36% in the proposed scheme. Under random oracle model and intractability of Discrete Logarithm Problem the proposed scheme is provably secure.