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This paper presents a procedure for precision measurements of stone surface roughness by close-range digital photogrammetric technique. To obtain the stone surface roughness from the ideal surface, the best fitting reference planes were determined by least square methods. The RMSE of the normal distance between the points of the sample areas and the reference planes did exceed 0.1mm.
The running-in behaviour of the metal carbon coating (WC/C) has been evaluated with regard to its applicability as wear-resistant coating to key components in engines. Confocal microscopy and scanning electron microscopy were used to observe worn surfaces and the wear scars on the steel balls. Elemental composition of the coating and worn surfaces were characterized using Auger electron spectroscopy. The friction behavior of WC/C coating was comparable to common carbon-based coatings. Thin tribofilm was formed on the worn surface of the steel ball due to material transfer and tribochemical reaction whereas there was no evidence of tribofilm generation on the coating surface. indicating the chemical innertness of WC/C coating.
In micro/nano-scale contacts in MEMS and NEMS, capillary and van der Waals forces generated around contacting micro-asperities significantly influence the performance of concerning device as they are related to adhesion and stiction of interacting surfaces, In this regard, it is of prime importance to accurately estimate the magnitude of surface forces so that an optimal solution for reducing friction and adhesion of micro/nano-surfaces may be obtained. We introduce an effective method to calculate these surface forces based on topography information obtained from an atomic force microscope
An experimental investigation of the basic characteristics of a micro-cantilever sensor was performed by inspecting the amplitude and frequency characteristics using a commercial tuning fork. Application of acetone and ethanol with a volume of 1μl on the tine of a vibrating tuning fork cause immediate response in its amplitude and frequency. It has shown that the tuning fork has ability to recognize a chemical agent with high sensitivity.
In digital processing of remotely sensed image data, digital mosaicking is required for display and analysis of large regions covered by more than one image. In this paper, digital mosaic process for any given multisensor data set of Landsat Thematic Mapper(TM) and SPOT multispectral(XS) data has been described. A statistical normalization was implemented to reduce radiometric discontinuity �� 새 the multisensor and multidata reflectance. An automated digital matching technique was used to find the corresponding ground control points in the overlapped area and to generate more geometrically accurate mosaic image.
The NT(nanotechnology) - IT(information technology) integrated technology has become new growth engine for the nation’s economy and technological competitiveness. A recent survey on the man power in NT- IT integrated field in Korea revealed that the demand is far greater than the supply. This causes an enormous expense to construct the state of art Nano and IT facilities and working environments. With the urgent needs and global technology trends, Seoul Technopark has been founded to assist and develop NIT based top-notch businesses, to train highly talented professionals, and to lead a major role in NIT research and manufacturing. As one of the core projects for Seoul Technopark, NIT University (NITU) program has been developed to bring forth a new future and new competitiveness for the nation. The NITU program has founded to foster talented experts in the field of Nano and IT integrated technologies, especially in the microsystems packaging (MSP) technology. It is confident that this program will continue to provide highly focused and practical education, to contribute human resource cultivation in the field of MSP technology and Nano and IT manufacturing equipment, which emerges as next generation growth industries, and to strengthen a global industrial competitiveness.
Optimal conditions for HA plasma spray-coating on Ti6Al4V alloy were investigated in order to obtain enhanced bone-bonding ability with Ti6Al4V alloy. The properties of plasma spray coated film were analyzed by SEM, XRD, surface roughness measurement, and adhesion strength test because the film's transformed phase and crystallinity were known to be influential to bone-bonding ability withTi6Al4V alloy. The films were formed by a plasma spray coating technique with various combinations of plasma power, spray distance, and auxiliary He gas pressure. The film properties were analyzed in order to determine the optimal spray coating parameters with which we will able to achieve enhanced bone-bonding ability with Ti6Al4V alloy. The most influential coating parameter was found to be the plasma spray distance to the specimen from the spray gun nozzle. Additionally, it was observed that a relatively higher film crystallinity can be obtained with lower auxiliary gas pressure. Moderate adhesion strength can be achievable at minimal plasma power. That is, adhesion strength is minimally dependent on the plasma power. The combination of shorter spray distance, lower auxiliary gas pressure, and moderate spray power can be recommended as the optimal spray conditions. In this study, optimal plasma spray coated films were formed with spray distance of 70 mm, plasma current of 800 A, and auxiliary gas pressure of 60 psi.
Tribological properties of nanoporous structured alumina film was investigated. Alumina film (AAO: anodic aluminum oxide) of 60 μm thickness having nanopores of 45 nm diameter with 105 nm interpore-diatance was fabricated by mild anodization process. Reciprocating ball-on-flat sliding friction tests using 1 mm diameter steel ball as a counterpart were carried out with wide range of normal load from 1 mN to 1 N in an ambient environment. The morphology of worn surfaces were analyzed using scanning electron microscopy. The friction coefficient was strongly influenced by the applied normal load. Smooth layer patches were formed on the worn surface of both AAO and steel ball at relatively high load (100 mN and 1 N) due to tribochemical reaction and compaction of wear debris. These tribolayers contributed to the lower friction at high loads. Extremely thin layer patches, due to mild plastic deformation of surface layer, were sparsely distributed on the worn surface of AAO at low loads (1 mN and 10 mN) without the evidence of tribochemical reaction. Delaminated wear particles were generated at high loads by fatigue due to repeated loading and sliding.
Phase contrast imaging in atomic force microscopy showed a promise as an effective tool for better understanding of micromechanical properties of surfaces at nano scale. A qualitative estimation model for phase contrast images obtained with a tapping mode AFM was developed. This investigation demonstrated the high efficiency of combined analysis of topography and phase contrast images for characterizing nanosurfaces. Phase contrast images allowed estimation of relative stiffness (elastic modulus) of the sample surface. The phase contrast images revealed a significant inhomogeneity of the nano scale worn surfaces. Phase contrast images are also capable of revealing the formation of tribofilms.