Advanced Materials Research Vols. 308-310

Abstract: The high average thermal expansion required for thermal compatibility of dental porcelain with their substrate alloy is supplied by the mineral leucite (KAlSi₂O₆). In the research, the high thermal expansion coefficients phase leucite was prepared by coprecipitation technique. Three materials with formulae of K₂O∶Al₂O₃∶SiO₂ = 1∶1∶x ( x=1.4, 2.0, 4.0 ) were investigated for differences in phase, thermal expansion. Unstoichiometric composition where K₂O and Al₂O₃ were added properly is advantage to leucite obtained. Coprecipitation processing produced fine leucite powder that would sinter at 1300°C, this temperature is about 200°C lower than of melting method. The average thermal expansion coefficients of leucite is 22.7×10-6/°Cfrom room temperature to 620°C,which is higher than the common porcelain. Changing in the leucite content of dental porcelain would results from thermal expansion coefficients of porcelain variation, which could be responsible for changes in porcelain-metal thermal compatibility.

Abstract: Book design is carried out and elaborated within a space of compact size and limited storage amount. It is not easy to accomplish a novel attractive book design, as innovation is required and connotation of books should be embodied. Especially when faced with the impact from electronic media, we have difficulty designing a book with a strong material sense and rich space and time association if we continue to design a book using single thought for publishment without the sense updating. Conceptual book design, based on the traditional books, is an attempt to seek a new morphological book form which fully incarnates the personality and connotation of a book and seeks to display the possibilities of the book contents. This paper mainly explores the morphosemantic meaning in conceptual book design and expounds features and expressions of morph morphosemantic of conceptual books, in order to contribute to the development of book design.

Abstract: With the rapid development of science and technology, science fiction products are gradually becoming realistic and stepping into and affecting our lives. This paper begins from the connotation of science fiction products in movies, analyzes social, economical and technological base for the existence of science fiction products, and involves the impact and function in existing product design of science fiction products in the aspects of innovative model, advanced technology and material use and so on. Finally it comes to the conclusion that we can take advantage of future technology and new materials of science fiction products in modern product design to improve man-machine relationship of realistic products, design new lifestyles, and better man’s quality of life.

Abstract: The problem facing of spool used in high pressure wellhead is illustrated. The methods and steps of conventional design and autofrettage design for spool are introduced. Based on the 4rd strength theory, the wall thickness of spool under 103.5MPa is designed using the two methods. Compared with the conventional design, the wall thickness of spool is declined 16.6%, the gross weight is 60% of previous, the stress distribution is more uniform and the utilization rate of raw materials is increased by autofrettage. Thus it provides a theoretical basis for design of spool used in high pressure wellhead.

Abstract: With the digitization of the whole society, digital reading becomes a new form of information-receiving, and technologies and products related with digital press, digital reading devices, reading contents, and reading methods have been always developing into perfection. Among all of these, humanization of digital reading design is no more limited in reading hardware. It shall meet users’ practical and aesthetic requirements by good-looking, practical, clear-themed, and simple operating system. This paper centers on digital reading and its visual expression to explore the features of digital reading with the hope of improving the coziness and pleasure of digital reading and offering information to receivers more effectively and correctly.

Abstract: A numerical simulation method is presented in this paper for 3D low speed micro flapping-wing with complex kinematics. The main characteristics for the numerical simulation of Flapping-wing Micro Air Vehicle (FMAV) include: low speed, big range of wing motion, and complex kinematics. The low speed problem is solved by preconditioning method. The big range of wing motion problem is solved by chimera grid system. The problem of complex kinematics is solved by decomposed into three main motions, i.e. plunging, pitching, and swing respectively. The numerical method is solving the Reynolds Averaged Navier-Stokes equations for the viscous flow over micro flapping-wing. The numerical method of this paper is validated by good accordance with experimental results of reference. This method can used to simulate the aerodynamic performance of micro flapping-wing with complex kinematics in low speed and is helpful to the FMAV designers as a design tool.

Abstract: Frequently wiggle of wrists is the primary cause of muscle fatigue and occupational diseases in the computer keyboard operation. It is revealed that the wiggle of wrist is caused by the workspace limit of finger tip. Based on the movement study and workspace analysis for human finger, a new type of computer keyboard designed with ergonomic consideration is put out. A tilting keyboard is used in the new configuration to fit the shape of finger workspace. It was approved by experiment that the new keyboard could reduce the rotation of wrist obviously, therefore to improve the comfort and avoid disorder of the wrist during operation.

Abstract: Based on FEM, a new type of ultrasonic elliptic vibrator design method was proposed, the ultrasonic elliptic vibration was achieved by the structural curve of the longitudinal and torsional vibrations. The impedance and vibration characteristics of the new longitudinal-torsional composite ultrasonic elliptic vibrator prototype were tested. It provides an important basis for impedance matching and longitudinal-torsional composite ultrasonic elliptical vibration application.

Abstract: Heat dissipation of high-power LED lamps has become a key technology to LED package due to the improvement of the LED output power. A detailed simulation of temperature distribution of three chips high-power LED tube lamp was made by finite element method. Based on the consistency of the LED lamp experimental and simulation results, the analyses of the effect of thermal conductivities of PCB, thermal grease, heat sink, convection coefficients and the length of the lamp on the junction temperature were made, which provide an effective reference for the thermal design.

Abstract: This paper proposes a new method for measuring 3D coordinates of a point using a single camera vision system. The contact point is determined by using 3D force sensors. In addition, the force limiting system has also been incorporated to improve accuracy of the results. 3D point is captured when the touching probe senses the force up to certain limit and subsequently recording of that point is initiated. The points being recorded are then processed for the required feature calculation such as distance between planes, angle, radius etc. The IMU (inertial measurement unit) initially estimates the target plane position which enables the whole system to perform the required task quickly. Hence, this system can be used for continuous scanning of any surface.