This paper presents a method for the determination of bending stress minimization of involute spur gears. A computer program has been developed to investigate the variation of bending stress and contact ratio dependin...
详细信息
This paper presents a method for the determination of bending stress minimization of involute spur gears. A computer program has been developed to investigate the variation of bending stress and contact ratio depending on the pressure angle on the drive side. Since asymmetric tooth is not standard, the tooth model, which was introduced by DIN 3990/Method C and ISO/TC 60, has been adjusted for asymmetric tooth by the authors. The determination of the tooth form and stress concentration factors for asymmetric tooth has been accomplished for each different parameter (pressure angles, tool radius, rack shift, etc.). The sample results, which were obtained by using a developed computer program, are illustrated with numerical examples.
Objectives. To determine the reproducibility of digitized dental stone replicas compared to the master model and the reliability of the computer aided analysis. Methods. Four master dies, prepared for complete crowns ...
详细信息
Objectives. To determine the reproducibility of digitized dental stone replicas compared to the master model and the reliability of the computer aided analysis. Methods. Four master dies, prepared for complete crowns were fabricated in presintered yttria-stabilized tetragonal zirconia (Y-TZP). Eight vinyl polysiloxane impressions (PROVIL novo;Heraeus Kulzer) were taken of each die and stone replicas were poured in type IV stone (Vel-Mix Stone;Kerr). The master dies and the stone replicas were digitized in a touch-probe scanner (Procera (R) Forte;Nobel Biocare AB), to create triangulated surface-models. The point-cloud from the first of the repeated digitizations of each master die was used as CAD-reference-models (CRM). Discrepancies between the points in the triangulated surface-models and the corresponding CRM were measured by a matching-software (CopyCAD 6.504 SP2;Delcam Plc). The distribution of the discrepancies was analyzed and presented in color-difference-maps. Results. The precision of the measuring method, presented as the repeatability coefficient, ranged between 7 and 16 mu m (entire surface), whereas the analysis of the stone replicas revealed a precision (repeatability coefficient) ranging from 19 to 26 mu m. The accuracy of the replica to master (the mean discrepancy) ranged from 0.5 to 2.0 mu m (95% confidence interval 1.5-2.9 mu m). Significance. The greatest precision of the measurement was seen in the jacket surface of the die. The size of the stone replicas varied and the repeatability coefficient was on average 15 mu m (2-25 mu m) greater for the replica-to-master alignment than the repeated digitizations of the master. (c) 2008 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
A method for estimating, from cytophotometric data, the proportion of cells in three different phases of the cell cycle is proposed. Computation is done by means of determining seven parameters in the approximate func...
详细信息
A method for estimating, from cytophotometric data, the proportion of cells in three different phases of the cell cycle is proposed. Computation is done by means of determining seven parameters in the approximate function for the fluorescence intensity histogram. The proportion of cells in the GI, S, and G2-M phases, obtained by this method, was found to be reliable.
Cold roll forming is a complicated metal processing, and its is very difficult to simulate the forming process. Based on the Updated-Lagrange method in the deformation mechanics, an elastic-plastic large deformation s...
详细信息
Cold roll forming is a complicated metal processing, and its is very difficult to simulate the forming process. Based on the Updated-Lagrange method in the deformation mechanics, an elastic-plastic large deformation spline finite strip method is developed to analyze cold roll forming of a thin channel section. The longitudinal membrane strain values on the edge of the deformed strip for four one-pass sequences in different fold angles are got. Simulated results are compared with the results from previously conducted experiments. The deviation of the simulated peak strain values is within 30% compared with the experimental results.
computer-aided circuit analysis techniques are utilized to predict the performance of individual CMOS cells and combinations of such cells which might be found in medium scale integrated circuits. The predictions incl...
详细信息
computer-aided circuit analysis techniques are utilized to predict the performance of individual CMOS cells and combinations of such cells which might be found in medium scale integrated circuits. The predictions include statistical variations, thermal effects, loading effects, and radiation effects including variations due to applied bias. Experimental data from tests conducted on devices from a special test wafer are compared to the predictions to provide verification of results.
Although thermal sterilisation is a widely employed industrial process, little work is reported in the available literature including patents on the mathematical analysis and simulation of these processes. In the pres...
详细信息
computer based analysis of blood and bone marrow cells is a task which cannot be solved once and for all, but is a task for which the solution should be developed continually in step with the advances made in the stat...
详细信息
computer based analysis of blood and bone marrow cells is a task which cannot be solved once and for all, but is a task for which the solution should be developed continually in step with the advances made in the state of knowledge of cell biology. Consequently the goal was set to develop a system (named KMIAT - Medical Image Analysing Tool for the K-Desktop Environment) for cell analysis in which the latest knowledge regarding the relationship between features of the cell images and the diagnosis can be can be integrated into the system and exploited by pathologists and medical doctors. The system KMIAT can be employed for other image processing applications involving classification of coloured or grey scale images. In the following the task of image processing for the diagnosis of leukaemia and features of the System KMIAT are described.
Historically, most published research in construction management topics has been based on quantitative methods. Recent debate within the construction management research community has focused concerns on the appropria...
详细信息
Historically, most published research in construction management topics has been based on quantitative methods. Recent debate within the construction management research community has focused concerns on the appropriateness of quantitative methods for investigation into social aspects of the subject. In this paper, two contributory factors behind the historical reliance on quantitative or positivist methods are addressed: the practical difficulties in analysing large amounts of unstructured data within sensible time-scales;and wider issues concerning the perceived rigour, depth of understanding, consistency and methodological transparency of qualitative analytical techniques. An interesting new dimension to qualitative research methodologies is the use of computer software to aid the textual analysis of ethnographic data. This paper is a reflexive example of the use of a computer-aided method in the analysis of a 'Grounded Theory' study, within industrial organizations with commercial objectives, It is concluded that, whilst computer aided analysis does not provide a definitive solution to the wider acceptance of qualitative research methods in the field, it offers considerable potential for construction management research projects which are undertaken within defined time and resource constraints.
computer programs for the analysis of cascaded two-ports, based on chain parameters, can be easily extended to incorporate computation of the noise properties of passive networks. The numerical results obtained for a ...
详细信息
computer programs for the analysis of cascaded two-ports, based on chain parameters, can be easily extended to incorporate computation of the noise properties of passive networks. The numerical results obtained for a five-section microstrip bandpass filter indicate that the noise factor is approximately equal to the attenuation, and no significant improvement can be obtained by a mismatch of the source.
Horizontal vee type transmission line insulator assemblies are described and the system's mechanical stability discussed. A computer program for determining the wind loading stability limits for typical system par...
详细信息
Horizontal vee type transmission line insulator assemblies are described and the system's mechanical stability discussed. A computer program for determining the wind loading stability limits for typical system parameters is presented. Methods are also considered for increasing the stability of such systems to wind induced forces.
暂无评论