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A series of charge-separated (CS) sensitizers with various donor modules and pyrimidine as acceptor were synthesized and employed to explore the effect of donor structure engineering on the properties of CS sensitizers and photovoltaic performances of dye-sensitized solar cells (DSSCs). Using previously reported CS sensitizer MTPA-Pyc or YD-Pyc as the model molecule, cyano group or benzotriazole were...
A porphyrin based ambipolar organic molecule consisting of styrene based triphenylamine derivative (MTPA) as electron donor, s-triazine group (TRC) as electron acceptor 1 and metal-free tetraphenyl porphyrin (HTPP) as electron acceptor 2 was synthesized and characterized using computational methods and electrochemical and spectroscopic measurements. The kinetics analysis indicates that the photo-induced...
In order to solve the problem of complicated calculation and frequent human intervention, a new method for extracting the centerline of blood vessel based on magnetic resonance angiography (MRA) is proposed in this paper. First of all, according to the different diameter of blood vessels, the multi-scale filtering algorithm is utilized for enhancing the different scales of blood vessels by Hessian...
In this paper, a new channel estimation method is proposed for channel estimation in the 3GPP LTE downlink. The channel estimation is first implemented in the time-domain before selecting the dominant channel taps to improve the signal to noise ratio (SNR) by ignoring the taps corresponding to the lower powers. In the frequency-domain, the transformed channel data corresponding to the pilot positions...
One of the major drawbacks of the OFDM systems is the high peak-to-average power ratio (PAPR), which limits its applications in wireless communication systems [1]. In this paper, an improved method is proposed for PAPR reduction in an OFDM system. It utilizes the selected mapping (SLM) scheme followed by an improved signal clipping method. Compared with the SLM-only-based approach, the proposed scheme...
In this paper, a beamforming scheme combined with quasi-orthogonal space-time block codes (QOSTBC) is proposed. At the transmitter, quasi-orthogonal space-time block coding signals is transmitted by using four independent transmit beams. As the receiver, a pairwise decoding algorithm is employed. A flat Rayleigh fading channel model is used in the simulations to compare performance of the proposed...
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