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  • 11
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 568-572 
    ISSN: 1662-7482
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study takes virtual instrument technology as the development platform to completedata acquisition, pre-processing, analysis and database storage for three orthogonal components of acutting force and the corresponding cutting temperature. Simultaneously, single-factorexperimentation is adopted to establish empirical formulas of these cutting state parameters forfurther check analysis. Hence real-time monitoring of cutting process can be implemented torepresent cutting-tool wear, failure and rationality of parameter selection in cutting state
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  • 12
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 1043-1048 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The fracture is an important failure behavior of cancellous bone. Three-point-bendingexperiment was used to study fracture behavior of cancellous bone. Three group specimens weretaken from two human femoral head and there was a non-angled crack and an angled crack in everygroup respectively. By using Digital Speckle Correlation Method (DSCM), the displacement andstrain field were obtained at the crack-tip and the full specimen. The initial crack path was always atthe maximal strain location and could be predicted by the DSCM. In the macro-scope, the crackpropagation paths towards the load tip, and are independent of the initial crack angle
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  • 13
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 667-671 
    ISSN: 1662-7482
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Aiming at different ground surfaces of hardened bearing steel GCr15, this paper madeexperimental research on assessment method of surface roughness based on computer visiontechnology. Firstly, some pre-processing of the ground images should be carried out to eliminatenoise and get more detail information, including image enhancement and median filtering. Then themethod of power spectrum analysis transformed representation of processed image from spatialdomain to frequency domain by adopting two-dimensional Discrete Fourier Transform. Gaining themean power spectrum named E and its corresponding radius r, we made efforts to seek the directionin which the arithmetic average surface roughness Ra varied according to E and r. After that thevariation rule can be regarded as an assessment basis of ground surface roughness
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  • 14
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 53-54 (July 2008), p. 231-235 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Grinding is a very complex machining process. Single grain grinding methods are usefulto study complex grinding action. Very low speed single-grain grinding tests were carried out for 45steel and 20Cr alloy with 14# ZA grain. The grinding groove width and depth, the grinding forceratio, specific grinding forces, and grain wear and fracture are studied. The plowing decreases withthe grinding section area or grinding depth increase. The average tangential force at grain fracture inthe experiments is 54.4N; the average normal force at grain fracture is 949.6N. The ratio oftangential-to-normal force varies suddenly when grain fracture
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  • 15
    ISSN: 1662-7482
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Boundary element (BE) analysis is well known as a tool for assessing the stiffness andstrength of engineering components, but, along with finite element (FE) techniques, it is also findingnew applications as a means of simulating the behaviour of deformable objects within virtual realitysimulations since it exploits precisely the same kind of surface-only definition used for visualrendering of three-dimensional solid objects. This paper briefly reviews existing applications of BEand FE within virtual reality, and describes recent work on the BE-based simulation of aspects ofsurgical operations on the brain, making use of commercial hand-held force-feedback interfaces(haptic devices) to measure the positions of the virtual surgical tools and provide tactile feedback tothe user. The paper presents an overview of the project then concentrates on recent developments,including the incorporation of simulated tumours in the virtual brain
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  • 16
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 762-766 
    ISSN: 1662-7482
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Polycrystalline Cubic Boron Nitride (PCBN) cutting tools has have been developedfor high speed machining in modern automation manufacture. The machining surface roughness isregarded as an important criterion to assess PCBN cutting tools performance. There are too manyproblems in conventional detection method. In order to solve that problem, we present a new waythat is based on image analysis of machining surface texture to assess surface roughness. The newmethod is consisted of three steps. It captures surface texture image when machining is finished orpauses. Firstly, RGB histogram is adopted to analyze image pixel information. This means takesadvantage of histogram technique and provides more pixel distribution information than grayhistogram. Secondly, unsupervised texture segmentation is used based on resonance algorithm.Thirdly, a new estimation parameter E that is the density of surface contour peak is put forward toestimate machining surface roughness
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  • 17
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 435-439 
    ISSN: 1662-7482
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to find an optimum assembly sequence in engineering design domain, aknowledge-based virtual assembly approach was put forward. Virtual assembly design environmentwas also introduced, and knowledge representation models for virtual assembly rules and cases areintroduced and studied respectively. A side-center virtual assembly method was applied to avoid theoccurrence of assembly interference. Finally, a case was employed to demonstrate the practicalityof knowledge-based virtual assembly planning
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  • 18
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 508-512 
    ISSN: 1662-7482
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The detecting instrument for surface quality of steel ball bases on embedded controlsystem and image detection technique, and is applied to detect surface defect region of steel ball inbearing. Its control system requires excellent real-time character and control accuracy. This paperputs forward a new design for controller of detecting instrument. We adopted TMS320LF2407Awhich produced by company TI as main processor, and integrated CPLD to develop an embeddedcontroller. We used the Ziegler–Nichols tuning methods to get PID control and designed hardwarecircuit. We realized the function of correlative logic elements through programming, andconstructed an embedded multitask operating system based on the transplant of μC/OS-II onTMS320LF2407A. It solved problems about intricate structure and bad real-time character existedin traditional control module. The result of simulation and experiment indicates that this controlsystem satisfied excellently the requirement of high speed and real-time image detection
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Annales geophysicae 13 (1995), S. 517-521 
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Eight accounts from ancient Chinese literature have been found that describe phenomena in contexts and in metaphors that are distinctly auroral. These accounts relate to personages purported to have lived in the third millennium B.C. The historicity of the personages and the actual dates of their lives are still a matter of controversy. Thus the accounts should be considered at a minimum as valuable additions to the inventory of ancient allusions to the aurora. At the other extreme, if taken at face value, they document the occurrence of low-latitude aurorae in the third millennium B.C.
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  • 20
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2806-2817 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The resonance Raman scattering of methyl iodide cooled in neat and seeded supersonic jets has been observed. The incident radiation is resonant with the X→B Rydberg transition (∼200 nm). To our knowledge this is the first reported observation of the resonance Raman scattering of jet-cooled species. Depolarization ratio measurements determine the rotational temperature of the molecular beam to be 10 K (4% CH3I/2 atm He). The only observed spectral evidence of (CH3I)n species (n≥2) in the cooled molecular beam is the appearance of the resonance Raman spectra of I2 produced by the photodecomposition of methyl iodide clusters. The nascent I2 is born with an extremely hot (∼1000 K) vibrational distribution. The excitation profile of the I2 vibrational resonance Raman scattering reveals that the absorption band of the clusters are much broader than that of the monomer. Semiempirical calculations (AM1) predict a CH3I dimer with a bent "heat-to-head'' ground-state equilibrium structure which is a favorable orientation for the production of I2.
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