Soil nitrogen (N) budgets are used in a global, distributed flow-path model with 0.5° × 0.5° resolution, representing denitrification and N2O emissions from soils, groundwater and riparian zones for the period 1900-2000 and scenarios for the period 2000-2050 based on the Millennium Ecosystem Assessment. Total agricultural and natural N inputs from N fertilizers, animal manure, biological N2 fix...

Hilbert's third problem: brief reminder. It is known that in a plane, every two polygons P and P ′ of equal area A(P ) = A(P ′) are scissors congruent (equidecomposable) – i.e., they can be both decomposed into the same nite number of pair-wise congruent polygonal pieces: P = P1 ∪ . . . ∪ Pp, P ′ = P ′ 1 ∪ . . . ∪ P ′ p, and Pi ∼ P ′ i . In one of the 23 problems that D. Hilbert formulated in 1...

this paper presents the seismicity and seismotectonic characteristics of esfahan and adjoining regions, an area bounded between 49.5-54o e and 31-34.1o n. according to mirzaei et al. (1998) this region is placed between two major seismotectonic provinces: zagros and central-east iran. the boundary between these two provinces is known to be the main zagros reverse fault. geological maps with sca...

Hilbert problems. In 1900, the world-wide mathematical community asked David Hilbert, the leading mathematician of his time, to prepare the list of challenging mathematical problems for the coming 20th century. After careful analysis, Hilbert selected 23 problems that he considered to be the most important and the most promising. These problems were delivered in his famous 1900 lecture [12]. Fr...

The short term effects of increased levels of CO(2) on gas exchange of leaves of bigtooth aspen (Populus grandidentata Michx.) were studied at the University of Michigan Biological Station, Pellston, MI. Leaf gas exchange was measured in situ in the upper half of the canopy, 12 to 14 meters above ground. In 1900 microliters per liter CO(2), maximum CO(2) exchange rate (CER) in saturating light ...

braconidae (hymenoptera) communities at high altitudes in alfalfa fields of kerman province (iran) were analyzed. the communities were sampled by sweep netting in 2014 and 2015. samples were taken from three altitudinal transects: 1900–2300 m, 2400–2700 m and 2800–3100 m. a total of 1773 braconid specimens belonging to seven subfamilies were collected. alpha, beta and gamma diversities were ana...

ethno-musicology is an academic field encompassing various approaches to the study of music that emphasize its cultural, social, material, cognitive, biological, and other dimensions or contexts instead of its isolated ‘sound’ component or any particular repertoire. the term ‘ethno-musicology’ became common in1950, although the emergence of the field can be traced back to the late nineteenth ce...

pistachio nut is one of the most important export crops in iran. for prevention of rancidity and to ensure good quality, pistachio must be harvested in a short time and be prepared for drying in 24h.the ohadi variety of iranian raw dry pistachio nuts was selected for the experiments. instrumental hardness and sensory characteristics of pistachio nuts such as: flavor , texture and total acceptan...