Biodiversity plays a crucial role in stability and productivity of natural ecosystem. The main goal of this research was to classify ecological groups in steppe rangeland and investigate their relationships with plant diversity indices. Therefore, fifty different Land Unit Tracts (LUT) were identified in Khod-Neuk basin, Yazd province, Iran, in 2010. Vegetation and soil samples were taken in th...

The timing of the disappearance of the snow cover in spring, or snow melt day (SMD), is a key parameter controlling the carbon dioxide balance between the northern mire and heath ecosystems and the atmosphere. We present a simple method for the determination of the SMD using a satellite-based surface albedo product (SAL). The method is based on the local change of albedo from higher wintertime ...

A common and high-performance practice when carrying out euclidian reconstruction from two cameras is to rst calibrate both cameras thanks to a pair of images of a calibration object. However, it remains di cult to accurately determine the intrinsic parameters of each camera and we know their value have a signi cant e ect on Euclidian reconstruction. Moreover, the calibration issued from a sing...

Around 1950, populations of the brown tree snake (Boiga irregularis) were introduced on Guam, a previously snake-free island. This introduction was the result of post-World War II traffic carrying military materials from the South Pacific region (Savidge 1987; Rodda et al. 1992). It resulted in major ecological changes and the loss of several bird and lizard species from the island starting in ...

Impact of mire reclamation on export potential and characteristics of dissolved carbons in the Sanjiang Plain, Northeast China Y. D. Guo, C. C. Song, Y. Z. Lu, Y. Y. Song, and Z. M. Wan Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China College of Earth Science, Jilin University, Changchun 130...

This paper presents an original approach to the problem of camera calibration using a calibration pattern. It consists of directly searching for the camera parameters that best project three-dimensional points of a calibration pattern onto intensity edges in an image of this pattern, without explicitly extracting the edges. Based on a characterization of image edges as maxima of the intensity g...

We present the first testate amoeba-based palaeohydrological reconstruction from the Swiss Alps, and the first depth to the water table (DWT) calibration dataset for this region. Compared to existing models, our new calibration dataset performs well (RMSEP1⁄4 4.88), despite the length of the Faculty of Physics, Adam Mickiewicz University, Poznań, Poland water table gradient covered (53 cm). The...

Purpose The aim of the study was to quantify the isolated tear film adhesion error in a Goldmann applanation tonometer (GAT) prism and in a correcting applanation tonometry surface (CATS) prism. Methods The separation force of a tonometer prism adhered by a tear film to a simulated cornea was measured to quantify an isolated tear film adhesion force. Acrylic hemispheres (7.8 mm radius) used a...