Fluorapatite from Cerro de Mercado, Durango, Mexico has been used in several important diffusion studies aimed at calibrating the closure temperature of the (U-Th)/He apatite thermochronometer and has become a de facto standard for (U-Th)/He laboratories. Nevertheless, replicate laser fusion analyses of small crystal fragments of the "Durango fluorapatite" typically yield a range of (U-Th)/He d...

optimal use of lands heavily relies on careful assessment of agro-ecological resources. the present study was aimed to zoning of suitable areas for of soybean cropping in qaresoo basin of golestan province by geographical information system (gis) and analytical hierarchy process (ahp). in this study, environmental components included: minimum, average, maximum temperatures, precipitation, slope...

One of the most important resources for drinking water is groundwater. Recently, the quality of groundwater has been endangered due to several reasons, including human activities, vast agricultural activities, and the discharge of industrial wastewater containing nitrogen (N) and heavy metals. For this study we investigated the values of NO3, NO2, and some heavy metals and analyzed the groundwa...

In character recognition, zoning based feature extraction is one of the most popular methods. The character image is divided into predefined number of zones and a feature is computed from each of these zones. Usually, this feature is based on the pattern (black) pixels contained in that zone. Some of such features are average pixel density, sum squared distance, histogram. But in such features,...

The ornamental and medicinal saffron with high economic value encompasses a great share of non-oil exports in Iran. As a result, identification of suitable areas for saffron cultivation in Ardabil province located in northwestern part of Iran necessitate effective planning for expanding cultivation and production of this product. Given the effect of various environmental factors on growth and y...

BACKGROUND To identify and analyze factors that influence the grading and zoning management model of emergency triage as a first step in the improvement of the system. METHODS Questionnaires were used to extract data from clinical histories of 286 patients who attended the Emergency Department of Binzhou Central Hospital (Binzhou City, Shandong Province, China) from September to November of 2...

BACKGROUND Zoning is a fundamental tool for the effective management of nature reserves. A three-zone model (core zone, buffer zone, and experimental zone) has been applied to nature reserves in China since 1980s; however, this model appears not fit for all types of nature reserves, especially wetlands. CASE DESCRIPTION Wuliangsuhai is such a typical wetland reserve, which can represent most ...

The paper presents currently used approaches to the assessment of water pollution by various types pollutants. Based on existing criteria, an algorithm for assessing risks and vulnerability anthropogenic impacts is proposed. software package obtained their basis makes it possible model processes spread pollutants in studied area, detect evaluate power sources manage them, assess vulnerabilities...