Investigation of the relationship between plant species and environmental factors plays an important role in plant ecology. The present study aimed to develop the best predicting model for distribution of Prangos uloptera DC. using logistic regression (LR) and Maximum Entropy Methods (MaxEnt) in its habitat in the southern rangeland of Ardabil province, Iran. Vegetation data (presence and absen...

42 A properly measured, effective cross slope facilitates drainage on highways and prevents 43 hydroplaning. There is a need for transportation agencies to identify and measure road sections 44 that have improper and non-effective cross slopes so that timely corrective maintenance can be 45 performed. However, the traditional manual methods used by transportation agencies to measure 46 cross sl...

abstract although many studies have been carried out about dam break, this phenomenon still is one of the most important issues in the field of hydraulic engineering due to its hazards to human societies. predicting the critical conditions including coincidence of flooding and dam break indicates more field studies requirement. in this research the mutual effects of coincidence of negative surg...

this research has been done with the aim of explaining environmental and managerial factors that affects on rangeland vegetation distribution in saral rangelands of kurdistan province. after selecting plant types as working area were done sampling from plant types and determined some of plants parameters such as kind and number of plants and cover percentage. various environmental factors such ...

This paper introduces the problem of non-coal mine open pit waste dump in Shandong province, puts forward plant ecological restoration mode as solution, analyzes through adopting GIS and RS technology, from four aspects: elevation, slope, slope direction sensitivity design area, combines field investigation to carry out structural reinforcement on abandoned dump, design. The different species l...

The paper presents a novel approach for extracting structural features from segmented cursive handwriting. The proposed approach is based on the contour code and stroke direction. The contour code feature utilises the rate of change of slope along the contour profile in addition to other properties such as the ascender and descender count, start point and end point. The direction feature identi...

Semi-arid ecosystems form the stage for a plethora of vegetation patterns; a feature that has been captured in terms of mathematical models since the beginning of this millennium. To study these patterns, we use a reaction-advection-diffusion model that describes the interaction of vegetation and water supply on gentle slopes. As water diffuses much faster than vegetation, this model operates o...

The operation of a mid-infrared laser at 2244 nm in a Cr:ZnS polycrystalline channel waveguide fabricated using direct femtosecond laser writing with a helical movement technique is demonstrated. A maximum power output of 78 mW and an optical-to-optical slope efficiency of 8.6% are achieved. The compact waveguide structure with 2 mm length was obtained through direct femtosecond laser writing, ...

of course then depends not only on the point z but also on the direction of approach 8, that is, on the slope m = y' = dy/dx. The main theorem is that, plotted in the a, ß plane, the locus of points 7, corresponding to a given point z, is a circle (the derivative circlet), or more accurately a suitably parametrized circle, which I have termed a clock (the derivative clock). Various expressions ...