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  • articleNo Access

    Surface Slip Effect on Thermal Environment of Hypersonic Non-Equilibrium Flows

    Boundary slip effect caused by low gas density has an important influence on the thermal environment of the vehicles. Numerical studies on the boundary slip effect and accommodation for moment and energy have been carried out in this paper. The simulations considering slip boundary and surface catalysis are validated with Arc-jet test data. Mechanism and rules of impact on surface heat flux by different boundary slip level (Knudsen number from 0.0028 to 0.05) has been investigated in typical hypersonic flow conditions. The results show that mechanisms of boundary slip effect on mass diffusion heat flux and convective heat flux are different; slip boundary diminishes the convective heat, whereas enhances the mass diffusion heat flux. Smaller moment and energy accommodation coefficient is equivalent to more rarefaction. As Knudsen number goes up, the influences of accommodation on heatflux are enhanced, it mainly affects the convective heat flux.

  • articleNo Access

    KILLING MUSHROOMS: THE REALPOLITIK OF TERMINATING INNOVATION PROJECTS

    Successful organizations depend not only on highly successful ideas and projects, but also on terminating poorer projects so that they do not drain their intellectual and other resources. There is, however, evidence that organizations let many projects go on for too long before terminating them. This paper investigates managers' termination behaviors in the energy industry along two dimensions — termination and accommodation. Managers have two main concerns when terminating innovative ideas and projects. One is that the idea is actually abandoned (termination) and the other is that whoever came up with the idea does not become de-motivated when a project is terminated (accommodation). We explore the variance in the data to generate categories of termination and accommodation behaviors. We group our findings into seven major categories of termination strategies that vary with respect to accommodation. We then discuss three major features of accommodation strategies.

  • articleOpen Access

    Simultaneously measuring ocular aberration and anterior segment biometry during accommodation

    In the human eye, accommodation is essential for functional vision. However, the mechanisms regulating accommodation and the ocular parameters affecting aberrations remain to be explored. In order to measure the alterations of ocular aberration and crystalline lens biometry during dynamic accommodative stimuli, we designed an optical coherence tomography with ultra-long penetration depth (UL-OCT) combined with a Shack–Hartmann wavefront sensor (SHWFS). This integrated set up measures human eye's anterior segment as well as monochromatic high-order aberrations (HOAs) with 6 μm resolution and (1/20) λ accuracy. A total of 10 healthy volunteers without ocular diseases were examined. Upon exposure to accommodative stimuli, the wavefront aberrations became larger. Among the anterior segment biometry, the anterior crystalline lens demonstrated significant curvature during accommodation and was the major cause of high-order aberration. These findings suggest that the front surface of the crystalline lens can significantly affect variation among aberrations, which is a key factor underlying the quality of human vision.

  • chapterNo Access

    Does the Accommodative Mechanism of the Eye Calibrate Itself Using Aberration Dynamics? – Oral Paper

    Kotulak and Schor have suggested that the accommodative mechanism of the human eye can determine the required response from the changes in retinal image contrast associated with the microfluctuations of accommodation. As other aberrations also display dynamic behaviour, they may too have an input in this self-calibration mechanism. An adaptive optics system with separate measurement and manipulation channels was developed to investigate this possibility. A rotating diffuser is used to reduce laser speckle. The light hits the 37-element piezoelectric deformable mirror twice to increase its effective stroke. The accommodation response to 0.75 D step changes in target vergence whilst inverting selective aberrations during the latency period was studied in three subjects. In two subjects, inversion of astigmatism and spherical aberration showed the greatest effect; suggesting that for these subjects the eye potentially calibrates itself using information obtained from the aberration dynamics. One subject could not accommodate even with the aberrations left unchanged, and so may require chromatic aberration to guide the accommodative mechanism.

  • chapterNo Access

    ADAPTIVE LEARNING OF ASSIMILATION AND ACCOMMODATION FOR INTELLIGENT AGENT SYSTEM

    This paper presents an adaptive approach to address a kind of adaptive learning for intelligent agent. We propose a knowledge processing cycle for intelligent agent to mimic the human's learning process. In this process we regard two important parts. We apply the assimilation process to learn the new information and the accommodation process when the new information has some conflict with agent's proper known. We use the JADE (Java Agent DEvelopment Framework) as our agent platform, and explain our approach through pursuit-evasion game.