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| 1 | Simulation of energy and water balance in Soil-Vegetation-Atmosphere Transfer system in the mountain area of Heihe River Basin at Hexi Corridor of northwest China显示文摘In the mountain area of inland Heihe River Basin at Hexi Corridor of northwest China during the vegetation growing season from May to September, the Simultaneous Heat and Water (SHAW) model of Soil-Vegetation-Atmosphere Transfer (SVAT) system is applied to simulating and studying energy and water balance of the soil-residue-plant canopy layers in the Picea crassifolia forest and the grassland by the forest at the shaded slope and the grassland at the sun-facing slope. The simulation of energy balance indicates that net radiation of the grass- land at the sun-facing slope is more than that of the Picea crassifolia forest and the grassland by the forest at the shaded slope. The energy outgoing components are the first latent heat and next sensible heat from the grassland both at the shaded slope and the sun-facing slope, but those at the former are less. The energy outgoing components are the first sensible heat and next latent heat from the Picea crassifolia forest. The composition and distribution of energy in the soil-residue-plant canopy layers in the Picea crassifolia forest and the grassland by the forest at the shaded slope make the soil layer receive less energy, which therefore, especially the forest possesses the energy conditions for soil water conservation. The simulation of water balance indicates that the water loss of the grassland at the sun-facing slope is mainly caused by soil evaporation, while evapotranspiration of the Picea crassifolia forest and the grassland by the forest at the shaded slope is less than that of the grassland at the sun-facing slope. Half of the evapotranspiration of the Picea crassifolia forest and the grassland by the forest at the shaded slope is consumed by transpiration. After precipitation, the soil water storage is increased much more for the Picea crassifolia forest and also more for the grassland by the forest at the shaded slope. Therefore the shaded slope vegetation, especially the forest is favorable for soil water storage. | KANG Ersi1, CHENG Guodong1, , SONG Kechao1, JIN Bowen1, , LIU Xiande3 2 3 & WANG Jinye3 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China 2. State Key Laboratory of Frozen Soil Engineering, Chinese Academy of Sciences, Lanzhou 730000, China 3. Academy of Water Resources Conservation Forest of Qilian Mountains, Gansu Province, Zhangye 734000, China | 2005 | Science China Earth Sciences2005，48，4： | 25 |
| 2 | Turbulent intensity and its similarity function over an Inner Mongolian grassland during spring显示文摘Macroscopic reason for the development of turbulences in fluid is the conjunction action of velocity and temperature shears. We use the 2008 spring flux observations in the surface layer over Inner Mongolian grassland, obtain the similarity functions of turbulent intensity under different stratification stability conditions, and calculate the clear day turbulent intensity in the spring, which is then analyzed and compared with the observed values of turbulent intensity. The results show that in the Inner Mongolian grassland, under the condition of spring unstable stratification of the surface layer, dependence of the similarity function of turbulent intensity on stratification stability follows a '2/3 power law'. The structural function is a constant under the neutral stratification condition, and complicated under the stable condition. The calculated turbulent intensity has a close correlation with the observed one, which verifies the accuracy of the similarity functions and the suitability of the theorem of turbulent intensity in the grassland region. | YUE Ping1,2,3, NIU ShengJie2, HU YinQiao4 & ZHANG Qiang1 1 Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster of CMA, Institute of Arid Meteorology, CMA, Lanzhou 730020, China 2 Nanjing University of Information Science and Technology, Nanjing 210044, China 3 Zhangye National Meteorological Observatory, Zhangye 734000, China 4 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou 730000, China | 2010 | Science China Earth Sciences2010，53，5： | 7 |
| 3 | A Fast Feature Extraction Method Based on Integer Wavelet Transform for Hyperspectral Images显示文摘Hyperspectral remote sensing provides high-resolution spectral data and the potential for remote discrimination between subtle differences in ground covers. However, the high-dimensional data space generated by the hyperspectral sensors creates a new challenge for conventional spectral data analysis techniques. A challenging problem in using hyperspectral data is to eliminate redundancy and preserve useful spectral information for applications. In this paper, a Fast feature extraction (FFE) method based on integer wavelet transform is proposed to extract useful features and reduce dimensionality of hyperspectral images. The FFE method can be directly used to extract useful features from spectral vector of each pixel resident in the hyperspectral images. The FFE method has two main merits: high computational efficiency and good ability to extract spectral features. In order to better testify the effectiveness and the performance of the proposed method, classification experiments of hyperspectral images are performed on two groups of AVIRIS (Airborne visible/infrared imaging spectrometer) data respectively. In addition, three existing methods for feature extraction of hyperspectral images, i.e. PCA, SPCT and Wavelet Transform, are performed on the same data for comparison with the proposed method. The experimental investigation shows that the efficiency of the FFE method for feature extraction outclasses those of the other three methods mentioned above. | GUYanfeng ZHANGYe YUShanshan | 2004 | Chinese Journal of Electronics2004，13，3： | 3 |
| 4 | A Kernel—based Nonlinear Subspace Projection Method for Dimensionality Reduction of Hyperspectral Image Data显示文摘A challenging problem in using hyper-spectral data is to eliminate redundancy and preserve useful spectral information for applications. In this pa-per, a kernel-based nonlinear subspace projection (KNSP)method is proposed for feature extraction and dimension-ality reduction in hyperspectral images. The proposed method includes three key steps: subspace partition of hyperspectral data, feature extraction using kernel-based principal component analysis (KPCA) and feature selec-tion based on class separability in the subspaces. Accord-ing to the strong correlation between neighboring bands,the whole data space is partitioned to requested subspaces.In each subspace, the KPCA method is used to effectively extract spectral feature and eliminate redundancies. A criterion function based on class discrimination and sepa-rability is used for the transformed feature selection. For the purpose of testifying its effectiveness, the proposed new method is compared with the classical principal component analysis (PCA) and segmented principal component trans-formation (SPCT). A hyperspectral image classification is performed on AVIRIS data. which have 224 svectral bands.Experimental results show that KNSP is very effective for feature extraction and dimensionality reduction of hyper-spectral data and provides significant improvement over classical PCA and current SPCT technique. | GUYanfeng ZHANGYe QUANTaifan | 2003 | Chinese Journal of Electronics2003，12，2： | 2 |
| 5 | Remifentanil preconditioning confers cardio protection via cardiac kappa-and delta-opioid receptors 显示文摘 | ZhangY Irwin MG Wong TM | 2005 | Anesthesiology2005，102，2： | 1 |
| 6 | Moleculardynamicssimulationofplasticdeformationduringnanoindentation显示文摘 | LiQ ZhangY ChuW | 2004 | ActaMetallurgicaSinica(China)2004，40，12： | 1 |
| 7 | Glycosylatedhemoglobininrelationshiptocardiovascularoutcomesanddeathinpatientswithtype2diabetes:Asystematicreviewand-meta-analysis显示文摘 | ZhangY HuG YuanZ etal | 2012 | PLoSOne2012，7，42： | 1 |
| 8 | PositivesolutionsofsingularsublinearEmden-Fowlerboundaryvalueproblems显示文摘 | ZhangY | 1994 | JMathAnalAppl1994，185，1： | 1 |
| 9 | AnovelHIV-!- encoded microRNA enhances its viral replication by targeting the TATA box region 显示文摘 | ZhangY FanM GengG etal | 2014 | Retrovirology2014，11，1： | 1 |
| 10 | Use of HEMA in gelcasting ofceramics:a case study on fused silica显示文摘 | ZHANGY CHENG Y B | 2006 | Journal of the Ameri-can Ceramic Society2006，89，9： | 1 |
| 11 | EffectofboronadGditiononinterfacemicrostructureandthermalconductivGityofCu/diamondcompositesproducedbyhightemperGatureGhighpressuremethod显示文摘 | HeJS ZhangHL ZhangY etal | | PhysicaStatusSolidiA0，211，： | 1 |
| 12 | Profilingof95microRNAsin pancreatic cancercelllines andsurgicalspecimensbyreal-timePCRanalysis显示文摘 | ZhangY LiM WangH etal | 2009 | WorldJSurg2009，33，4： | 1 |
| 13 | Pharmacokinetics of vildagliptin in patients with varying degrees of renal impairment显示文摘 | HeYL KulmatyckiK ZhangY | 2013 | Int J Clin Pharmacol Ther2013，51，9： | 1 |
| 14 | Positionalcloningofthemouseobesegeneanditshumanhomologue显示文摘 | ZhangY ProencaR MaffeiM etal | 1994 | Nature1994，372，： | 1 |
| 15 | Amicrodialysis study of effects of gastrodin on neurochemical changes in the ischemic/reperfused rat cerebral hippocampus显示文摘 | Zeng XH ZhangY Zhang SM | 2007 | Biol Pharm Bull2007，30，4： | 1 |
| 16 | Clinicopathologicalandprognosticsignificanceofgalectin-1andvascularendothelialgrowth factor expression in gastric cancer显示文摘 | ChenJ ZhouSJ ZhangY etal | 2013 | World JGastroenterol2013，19，13： | 1 |
| 17 | Anewlogicfor DNA engineering using recombinationinEscherichiacoli显示文摘 | ZhangY BuchholzF MuyrersJP StewartAF | 1998 | NatGenet1998，20，12： | 1 |
| 18 | An emerging recombinant human enterovirus 71 responsible for the 2008 outbreak of hand foot and mouth disease in Fuyang city of China 显示文摘 | ZhangY ZhuZ YangW | 2010 | Virology Journal2010，7，： | 1 |
| 19 | DNAcloningbyhomologousrecombinationinEscherichiacoli显示文摘 | ZhangY MuyrersJP TestaG StewartAF | 2000 | NatBiotechnol2000，18，13： | 1 |
| 20 | Treatmentoftype2diabetesanddyslipidemiawiththenaturalplantalkaloidberberine显示文摘 | ZhangY LiX ZouD etal | 2008 | JClinEndocrinolMetab2008，93，7： | 1 |
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