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We present an image-based 3D face modeling algorithm. Different from traditional complex stereo vision procedure, our new method needs only two orthogonal images for fast 3D modeling without any camera calibration. The proposed method has two steps. Firstly according to MPEG-4 protocol for 3D face structure, we appoint and deform feature points by radial(More)
BACKGROUND Although it has been widely accepted that global changes will pose the most important constrains to plant survival and distribution, our knowledge of the adaptive mechanism for plant with large-scale environmental changes (e.g. drought and high temperature) remains limited. METHODOLOGY/PRINCIPAL FINDINGS An experiment was conducted to examine(More)
BACKGROUND Global climatic change is generally expected to stimulate net primary production, and consequently increase soil carbon (C) input. The enhanced C input together with potentially increased precipitation may affect soil microbial processes and plant growth. METHODOLOGY/PRINCIPAL FINDINGS To examine the effects of C and water additions on soil(More)
Single photon emission computed tomography (SPECT) studies require the patient to remain motionless for protracted period of time. But considerable patient discomfort can lead to patient motion, which will introduce the image artifacts and degrade resolution. If the patient motion can be detected, it is possible to compensate for the motion to reduce or(More)
ACKNOWLEDGMENTS My deepest gratitude to my supervisor, Prof. Michael Gennert. This thesis is to a large extent a results of his skillful guidance and encouraging support of my work. My sincere thanks to Prof. Matt Ward for agreeing to be the second reader of this thesis. I also thank UMass Medical School Nuclear Medicine group, for providing a work(More)
At the species level, plants can respond to climate changes by changing their leaf traits; however, there is scant information regarding the responses of morphological, physiological and anatomical traits of plant functional types (PFTs) to aridity. Herein, the leaf traits of five PFTs representing 17 plant species in temperate grasslands were examined(More)
There have been debates on the driving factors of C4 plant expansion, such as PCO2 decline in the late Micocene and warmer climate and precipitation at large-scale modern ecosystems. These disputes are mainly due to the lack of direct evidence and extensive data analysis. Here we use mass flora data to explore the driving factors of C4 distribution and(More)
Elucidating the driving factors among-population divergence is an important task in evolutionary biology, however the relative contribution from natural selection and neutral genetic differentiation has been less debated. A manipulation experiment was conducted to examine whether the phenotypic divergence of Leymus chinensis depended on climate variations(More)
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