Atmospheric nitrogen (N) deposition is an important determinant of N availability for natural ecosystems worldwide. Increased anthropogenic N deposition shifts the stoichiometric equilibrium of ecosystems, with direct and indirect impacts on ecosystem functioning and biogeochemical cycles. Current simulation data suggest that remote tropical forests still receive low atmospheric N deposition du...

asphaltene precipitation and deposition is a serious problem in many iranian fields. the deposited asphaltene results in partial or total blockage of the wellbore and wellstring reducing or completely seizing oil production. this paper studies the asphaltene problem and mitigation methods in wellstring systematically. it presents new approach based on the combination of thermodynamic modeling o...

Introduction: Nitrogen (N) pollution affects many of California’s ecosystems and the amount of N that is delivered to these ecosystems will continue to increase. Plant growth is strongly dependent on nitrogen availability. Many previous studies have seen this, yet most of these studies have focused on the response of plants under experimental conditions to high rates of N over a few years [1]. ...

Microcrystalline silicon solar cells with AM 1.5 conversion efficiency above 5 % have been deposited at deposition rates in excess of 10 Å/s. This is achieved by VHF-GD at an excitation frequency of 130 MHz. By increasing the plasma power at a dilution ratio of 7.5 % silane/(silane+hydrogen) there first appears a morphological transition from a-Si:H to μc-Si:H and then an increase in deposition...

Our research program focuses on identifying and quantifying sediment erosion, transport, and deposition processes on the continental shelf through state-of-the-art observational techniques in both fine grained and sandy environments. In sandy environments our goal is to understand the detailed interactions and feedbacks between hydrodynamics, bedforms, and the resulting sand transport. In fine-...

Our research program focuses on identifying and quantifying sediment erosion, transport, and deposition processes on the continental shelf through state of the art observational techniques in both fine grained and sandy environments. In sandy environments our goal is to understand the detailed interactions and feedbacks between hydrodynamics, bedforms, and the resulting sand transport. In fine ...

Several silicon dioxide chemical vapor deposition processes using high density plasma sources have been recently proposed in the literature [11, 7] for deposition of self-planarizing inter-level dielectric deposition. All these processes exhibit the competitive effect of simultaneous deposition and etching mechanisms. This paper describes the use of a robust simulation technique that can includ...

Abstract In this paper we present a kinetic model based on numerical simulations of a chemical vapor deposition (CVD) process. We discuss a model that is based on kinetics of the deposition rates to the material. Such a kinetic model helps to explain the experimental results and reduce expensive real-life studies. We concentrate on experiments with 3 2 Ti SiC and we verify our model based on te...

Aerosol particles can readily penetrate through air permeable fabrics. Air flow and aerosol deposition models were used to determine the skin deposition rates of aerosols through up to two fabric layers. These models were used in conjunction with a plume dispersion model to examine the risks associated with wearing air permeable CBR protective clothing, to inform IPE fabric development programs...