Weihua Guo

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2D optical beam steering through an InP photonic integrated circuit with on-chip monitors and an AWG-like structure has been demonstrated. Electronically controlled 2D optical beam steering is potentially useful for applications like LIDAR, 3D imaging, precision targeting, guidance and navigation, etc. Recently, we have demonstrated an InP photonic(More)
We use an integrated computational approach to reconstruct accurately the transition state ensemble (TSE) for folding of the src-SH3 protein domain. We first identify putative TSE conformations from free energy surfaces generated by importance sampling molecular dynamics for a fully atomic, solvated model of the src-SH3 protein domain. These putative TSE(More)
—Two-dimensional optical beam steering using an InP photonic integrated circuit has been demonstrated. Lateral beam steering controlled by a 1-D phased array has been made easier through on-chip interferometer monitors. Longitudinal beam steering controlled by the input wavelength has demonstrated an efficiency of 0.14 • /nm. Very fast beam steering (>10 7(More)
Optical beam steering controlled by an array of phase shifters from an InP photonic integrated circuit has been demonstrated with the help from on-chip monitors. Electronically controlled optical beam steering is potentially useful for a number of applications such as light detection and ranging (LIDAR), 3D imaging, precision targeting, guidance and(More)
Large-scale InP photonic integrated circuit containing 132 optical phased array packaged with ball grid array has demonstrated two-dimensional (2D) optical beam steering. Electronically controlled two-dimensional (2D) optical beam steering is potentially useful for light detection and ranging (LIDAR), secure laser communication, printing, etc. Recently we(More)
Acer buergerianum Miq. (Trident maple) is a native species of China with a large distribution, but exist in small population. Water and light are two important factors limiting plant growth and are crucial in the framework of forest regeneration. However, there is no consensus on how shade interacts with drought. Four hypotheses in the recent literature(More)
Increasing atmospheric nitrogen (N) deposition and biological invasion have become major concerns with global environmental change. This study aimed to determine the effects of an exotic species on a native one under increasing N deposition. We conducted a greenhouse experiment in which the exotic species Robinia pseudoacacia and the native species Quercus(More)
Anthropogenic nitrogen (N) and phosphorus (P) input has changed the relative importance of nutrient elements. This study aimed to examine the effects of different nutrient conditions on the interaction between exotic and native plants. We conducted a greenhouse experiment with a native species Quercus acutissima Carr. and an exotic species Rhus typhina L.(More)