We explore theoretically the optical response properties in an optomechanical system under electromagnetically induced transparency condition but with the mechanical resonator being driven by an additional coherent field. In this configuration, more complex quantum coherent and interference phenomena occur. In particular, we find that the probe transmission spectra depend on the total phase of the applied fields. Our study also provides an efficient way to control propagation of a probe field from perfect absorption to remarkable amplification.

A novel quad-band bandpass filter with individually controllable centre frequencies and bandwidths using a folded stepped-impedance resonator (SIR) is proposed. The new filter that centres at 2.4, 3.3, 4.1 and 5.2 GHz has a measured passband insertion loss of no more than 1.6 dB, and has a miniature circuit size of 0.448λ g × 0.027λ g. The presented filter is fabricated and tested, and the experiment demonstrates the new design. The new quad-band bandpass filter has compact and simple circuit topology, good performance of low passband insertion loss and transmission zeros, and greatly reduced circuit size compared with the relative reports.

No abstract

In this paper, a compact battery charger based on wireless power transfer (WPT) technology without any communication requirement is proposed. Here, a new intermediate coil is developed to achieve load-independent constant current (CC) and constant voltage (CV) outputs. The intermediate coil is spilt into two coils and is overlapped with the receiver coil to form a compact structure. Two switches on the receiver side are used to reconfigure the intermediate resonant circuit in order to select different charging modes, i.e., CC mode or CV mode. The communication between the transmitter side and the receiver side as well as complex control strategies are not needed in the proposed structure. Besides, the proposed system can achieve zero phase angle (ZPA) operation, fixed operating frequency and zero voltage switching (ZVS), which not only can lower the power rating of power devices but also improve the efficiency. A laboratory prototype with a 3.6A charging current and a 48V charging voltage is built to verify the feasibility of the proposed method.Index Terms-Wireless power transfer (WPT), battery, constant current (CC), constant voltage (CV) Recently, to address the issues mentioned above, various approaches have been investigated. The CC output and CV outputs can be achieved by adjusting the operating frequency of the WPT system [6]. However, the WPT system may be unstable by using the frequency control method due to the frequency bifurcation phenomenon [7]. Besides, without zero phase angle (ZPA) operation of the inverter, reactive power will be generated, which will increase the power rating of the power deceives in the inverter. Furthermore, the wireless communication between the transmitter side and the receiver side is needed for the feedback control, which increases the overall system cost.It is desirable that the output current and output voltage are independent of the load, which can simplify the design of the control dramatically. By using an optimal operating frequency, a series-series (SS) tuned WPT system can achieve the load-independent CV output [8]. Nevertheless, the realizations of ZPA and CC output are missing in [8]. Both load-independent CC and CV outputs can be achieved by switching series compensation into parallel compensation on the transmitter side [9]. However, it needs three switches and an extra inductor on the receiver side, which will increase the cost and installation space. A hybrid compensation topology, using an inductor, three capacitors, and two switches, is used on the receiver side to achieve CC and CV charging [10]. Similarly, additional components used on the receiver side will increase the installation space.Another concern is that, in existing wireless battery charging systems, communication between the stationary transmitter in the charging station and the receiver attached to the battery of the vehicle is usually required to form a closed-loop control. Unfortunately, wireless communication facilities will increase the system cost. Also, the charging performance suffers f...

Hypothesis testing using Bayes factors (BFs) is known not to be well defined under the improper prior. In the context of latent variable models, an additional problem with BFs is that they are difficult to compute. In this paper, a new Bayesian method, based on decision theory and the EM algorithm, is introduced to test a point hypothesis in latent variable models. The new statistic is a by-product of the Bayesian MCMC output and, hence, easy to compute. It is shown that the new statistic is easy to interpret and appropriately defined under improper priors because the method employs a continuous loss function. The method is illustrated using a one-factor asset pricing model and a stochastic volatility model with jumps.JEL classification: C11, C12, G12.

a b s t r a c tA new Bayesian test statistic is proposed to test a point null hypothesis based on a quadratic loss. The proposed test statistic may be regarded as the Bayesian version of the Lagrange multiplier test. Its asymptotic distribution is obtained based on a set of regular conditions and follows a chi-squared distribution when the null hypothesis is correct. The new statistic has several important advantages that make it appealing in practical applications. First, it is well-defined under improper prior distributions. Second, it avoids Jeffrey-Lindley's paradox. Third, it always takes a non-negative value and is relatively easy to compute, even for models with latent variables. Fourth, its numerical standard error is relatively easy to obtain. Finally, it is asymptotically pivotal and its threshold values can be obtained from the chisquared distribution. The method is illustrated using some real examples in economics and finance.Crown

No abstract

This paper presents design and optimization of an 8-DOF haptic manipulator using series-parallel mechanism. Parallel mechanism is designed to control 3-DOF translation input parameters and transfer the feedback force to the operator. Series mechanism is a 4-DOF quadruple-axial concurrent redundant mechanism, controlling three orientation angles. Forward and inverse kinematic analyses have been performed and the jacobian matrix is derived. Operating performance indexes such as global conditioning index, global kinematic performance fluctuant index and workspaces are evaluated to find optimal parameters in design stage.