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We study human perception of gaze rendered by popular semi-virtual robotic heads, which use a screen to render a robot’s face. It is known that when these heads are stationary, the screen may induce the Mona Lisa gaze effect, which widens the robot’s apparent cone of direct gaze. But how do people perceive gaze when the head can move as well? To study this question, we conducted a laboratory experiment that investigated human perception of robot gaze when a semi-virtual platform looked in different directions. We varied the way in which the robot conveyed gaze, using several behaviors involving 2D eye and head motion. Our results suggest that the interplay between these motions can regulate how wide users perceive the robot’s cone of direct gaze. Also, our findings suggest that the location of observers can affect the perception of gaze by semi-virtual robotic heads. We discuss the implications of our findings for social interaction.

A modified antenna based on fractal split ring resonators (FSRRs) is presented. The antenna is composed of two layers of Teflon with a low permittivity (e=2.2). The inner and outer ring of FSRRS are connected with ground plane by two metal pins by which way the antenna is similarly to planar inverted-F antennas (PIFAs). The modified antenna with fractal split ring resonators (FSRRs) make the size of antenna to 0.06λ× 0.06λ for the low frequency and 0.11λ×0.11λ for the high frequency while the gain of antenna is higher about 2dB than antenna with SRRS. Simulated and measured results of return losses and gains of this modified antenna are provided.

A dielectric embedded monopole antenna is proposed for super wideband(SWB)applications. The antenna is designed become inverted cone in order to expand the bandwidth, and the SWB antenna possesses a method to minimize the size of antenna by dielectric embedded to lower the height. The antenna is simulated and measured after practically fabricated. Measured results show a good agreement with simulated results that a −10dB bandwidth of 43.5GHz (4.5–48GHz) is achieved with ratio bandwidth 10.7∶1.The antenna prototype shows good impedance matching, stable far-field radiation patterns, and constant group delay over the super wideband.

In order to cure and damp coupled bunch instabilities (CBI), a bunch-by-bunch (BxB) measurement and transverse feedback system is under commission at Hefei light source (HLS). In this paper we introduce the overview of the measurement and analogy transverse BxB feedback system in emphases. The measurement system is dedicated to observe the beam instability and works as a part of the analogy and digital transverse BxB feedback system. The development of several characterized components and stripline feedback kicker as well as the experiment result of the feedback system in HLS ring is also presented in this paper.

Several novel approaches are summarized, which are from our EMC project practices for recent years. These include: (1) A universal near/far field algorithm,; (2) A deductive method for near/far field estimate; (3) Element technique combined with GTD approaches to predict near/far field. Some examples are shown to support these approaches. They may be widely used in the antenna analysis and EMC prediction.

In order to cure and damp coupled bunch (CB) instabilities caused by the high order modes (HOMs) of the RF cavity and the resistive wall impedance of the Ring vacuum chamber. HOMs are ineluctable during the operation of the accelerator. An observer system characterized by bunch by bunch measurement of transverse β oscillation and longitudinal synchrotron phase oscillation has been constructed and commissioned at Hefei Light Source (HLS) [1, 2]. A transverse bunch-by-bunch feedback system is under construction. The design and development of the observe systems, as well as diagnostics results of machine instabilities are presented in this paper.

Measurement principles and analysis of Turn-by-Turn beam position monitor system at Hefei Light Source (HLS) are presented in this paper. In emphases, several typical applications are presented here, which include the commissioning of upgraded injection system on HLS storage, monitoring of transientν transientν transientν transientν transientν transientν transientν transientν transientν transientν and damping time of storage ring, beam instability in injection, as well as experiments of low frequency feedback system. Precise analyses of experimental results offer some conclusions, which are consistent with theoretical expectations. The system plays an important role in study of beam instability and improvement of machine performance.

In this paper, we introduce a bunch tracing system which is based on a bunch-by-bunch (BxB) measurement system in Hefei Light Source (HLS), and present the analysis of the experiment results. Using an in-phase gate signal and a double balance mixer to control an external trigger of ADC, we test the reliability of the BxB system. By this system, we can trace all marked bunches in a set time slot or in manual burst mode. We can record all bunches’ data during the injection, ramping, wiggler excitation and normal operation, and provide a powerful facility for machine study.