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6 results

  • Key deviation source diagnosis of complex thin-walled structures based on complex networks and weighted transfer entropy

  • Y.G. Zhu, Q. Shi, W.P. Jiang, B. Deng
  • Journal:
    The Aeronautical Journal / Volume 128 / Issue 1322 / April 2024
    Published online by Cambridge University Press:
    14 August 2023, pp. 812-829
    • Article
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  • There are many deviation sources in the assembly process of aircraft complex thin-walled structures. To get important factors that affect quality, it is crucial to diagnose the key deviation resources. The deviation transfer between deviation sources and assembly parts has the characteristics of small sample size, nonlinearity, and strong coupling, so it is difficult to diagnose the key deviation sources by constructing assembly dimension chains. Therefore, based on the deviation detection data, transfer entropy and complex network theory are introduced. Integrating the depth-first traversal algorithm with degree centrality theory, a key deviation diagnosis method for complex thin-walled structures is proposed based on weighted transfer entropy and complex networks. The application shows that key deviation sources that affect assembly quality can be accurately identified by the key deviation source diagnosis method based on complex networks and weighted transfer entropy.

  • Leftward deviation of the primary septum or dividing left atrial shelf?

  • Part of
  • Jelena Hubrechts, Julie Pollenus, Marc Gewillig
  • Journal:
    Cardiology in the Young / Volume 31 / Issue 12 / December 2021
    Published online by Cambridge University Press:
    09 November 2021, pp. 1893-1900

  • Isolated leftward prolapse or deviation of the primary atrial septum is a rare CHD that can mimic abnormal pulmonary venous return at first sight. We present a case of a newborn infant, referred for surgical correction of totally anomalous pulmonary venous return into the right atrium, with the peri-operative finding of a leftward deviation of the superior margin of the primary atrial septum. The distinction with a dividing atrial shelf could not be confirmed with certainty. Fifty-three similar cases from the literature are incorporated. A detailed review of the current account on atrial septation is studied. The embryological and clinical features of a dividing partition of the left atrium are discussed.

  • 15 - Throughflow Code for Radial Compressors

  • Michael Casey, Chris Robinson
  • Book:
    Radial Flow Turbocompressors
    Published online:
    08 July 2021
    Print publication:
    29 April 2021, pp 480-527

  • Summary

    This chapter describes a streamline curvature throughflow method which has been developed specially for radial machines, such as centrifugal compressor stages, pumps and radial turbines. The method can also be used for axial machines, both compressors and turbines, and for axial compressors with a centrifugal rear stage. The terms in the governing equation are described in some detail to illustrate how the geometry controls the pressure and flow gradients both along and normal to the streamlines in the compressor. Such codes have been in use since the 1960s as they a offer a good overview of the ideal velocity and pressure distributions through a component. They also highlight blade loading issues and identify risks of choking. In the design process, the throughflow method weeds out the weakest design options very quickly and thus eliminates the need for more complex, time-consuming CFD simulations on poor designs. A comparison of a throughflow calculation with the test results on the Eckardt impeller A shows the limits of the method and the efficacy of this procedure for preliminary design.

  • P02-136 - Questionnaire on Sexual Attitude and Function 2009: a Novel Clinical and Epidemiological Computer Based Tool

  • K. Pirkalani, Z. Talaei Rad
  • Journal:
    European Psychiatry / Volume 25 / Issue S1 / 2010
    Published online by Cambridge University Press:
    17 April 2020, 25-E750
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  • Objective

    To study sexual problems of our patients and standardizing it for patients with or without religious and cultural restrains we developed a questionnaire with 240 phrases that were extracted from a pool of 1400 sentences addressing sexual problems. Sixty four scales under four headings (sexual general characteristics, deviations, dysfunctions and psychodynamic syndromes) (16 items each) were evaluated based on criteria of DSM-IV and ICD 10. Five validity scales (honesty, desirability, debasement, guilt feeling and overall validity) were also used for better assessment.

    Methods

    A total of 1300 patients in the four variants of the test were evaluated during a time span of 7 years. The questions were presented to examinees at 8th. Grade and higher in a calm environment and the results were evaluated by a computer software specifically developed for this purpose.

    Results

    The last version of the test was completed by 734 patients with excellent compliance. It was of nice politeness and comprehensiveness. For almost all scales the sensitivity and specificity were around 85 and 92% respectively.

    Conclusion

    We conclude that QSAF 2009 is an excellent tool both in clinics (diagnosis and follow up) and epidemiology with high sensitivity and specificity. It has also application in cross cultural studies, medico - legal issues and medical documentation. It prevents face to face interviews, breaks patients’ resistance and is less time consuming than scheduled interviews.

  • EPA-0632 – Questionnaire on Sexual Attitude and Function 2009: A Novel Clinical and Epidemiological Computer Based Tool

  • K. Pirkalani
  • Journal:
    European Psychiatry / Volume 29 / Issue S1 / 2014
    Published online by Cambridge University Press:
    15 April 2020, p. 1
    • Article
      • You have access
    • PDF
    • Export citation
  • Objective:

    To study sexual problems of our patients and standardizing it for patients with or without religious and cultural restrains we developed a questionnaire with 240 phrases that were extracted from a pool of 1400 sentences addressing sexual problems. Sixty four scales under four headings (sexual general characteristics, deviations, dysfunctions and psychodynamic syndromes) (16 items each) were evaluated based on criteria of DSM-IV and ICD 10. Five validity scales (honesty, desirability, debasement, guilt feeling and overall validity) were also used for better assessment.

    Methods:

    A total of 1300 patients in the four variants of the test were evaluated during a time span of 7 years. The questions were presented to examinees at 8th. Grade and higher in a calm environment and the results were evaluated by a computer software specifically developed for this purpose.

    Results:

    The last version of the test was completed by 734 patients with excellent compliance. It was of nice politeness and comprehensiveness. For almost all scales the sensitivity and specificity were around 85 and 92% respectively.

    Conclusion:

    We conclude that QSAF 2009 is an excellent tool both in clinics (diagnosis and follow up) and epidemiology with high sensitivity and specificity. It has also application in cross cultural studies, medico – legal issues and medical documentation. It prevents face to face interviews, breaks patients’ resistance and is less time consuming than scheduled interviews.

  • A novel and practical strategy for the precise chamferless robotic peg hole insertion

  • H. Qiao, B. S. Dalay, R. M. Parkin
  • Journal:
    Robotica / Volume 13 / Issue 1 / January 1995
    Published online by Cambridge University Press:
    09 March 2009, pp. 29-35

  • The influence of the angle between the axes of the peg and hole (angular error) and the contact surface defects on the measurement of deviation (lateral error) have been carefully analysed. It has been shown that they would influence the measurement of the magnitude of deviation and even its direction. This phenomenon causes severe difficulty in the assembly operations. A novel strategy for the high-precision chamferless peg hold insertion with a wrist force sensor is presented. This strategy is constructed: (1) to obtain the relationship between the peg and hole from the force sensor signal when an angle between the axes of the peg and hole exists and defects of the contact surfaces are present, (2) to reduce the angular and lateral errors, (3) to achieve the precise chamferless robotic peg hole insertion. In this paper, the insertion can be obtained with a reasonably large range of initial conditions. The principle is to move and rotate the peg from an area having many geometric uncertainties to a new area, where the deviation of the peg and hole can be obtained.