Search results

Seneor et al [1] have reviewed the experiments and theories on the interplay between Coulomb blockade and spin properties (namely Magneto-Coulomb effects) in structures where a single nano-object is connected to ferromagnetic leads, and have also discussed briefly the future directions in the emerging field of nanospintronics towards quantum dots, carbon nanotubes and single molecule magnets.
Kervalishvilia and Lagutinb [2] have given a brief overview of recent advances in the area of semiconductor nanomaterials, which represent extremely promising applications for materials with the spin-polarized transport of the charge carriers, and on the basis of the last theoretical and experimental achievements, have shown that the development of diluted semiconductors with the controlled disorder and the wide energy gaps as well as the study of their molecular structures are very prospective routes for producing the novel magnetic semiconductors.
It is now well established that the modern nanoscience is the interdisciplinary branch of investigations, covering physics, chemistry, biology and computational mathematics, leading the researchers to aim, for the well-controlled manipulation of objects (atoms, molecules and clusters) on the nanometre scale.
A technical note on magnetic tunneling junctions, their types, structures and significance in spintronics.

The host glass structure was determined in bulk form through X-ray diffraction (XRD) analysis on a Siemens D5000 X-ray diffractometer at range of 2q = (5 – 80 degree) utilizing Cu-Ka (1.5406 Å) radiation with an applied voltage of 40 KV and 40 mA anode current at rate of 20 min-1.
The increase in molar volume is often related to the formation of greater number of non-bridging oxygens (NBOs), which modified the tellurite host structure and creating more network spaces.
In this work both physical and chemistry properties of the Er3+ nature within glass matrix are justified from the obtained JO intensity parameters Wt.
Such inhomogenous broadening has been suggested due to the complexness of the glass network structure which offered greater variety of dopant sites and as consequences modified the local crystal field surrounding the Er3+ ions [33].

Besides, some of the procedures (e.g. in Germany and The Netherlands) also take ecological processes (Ecological services) into account, like nutrient cycling, organic matter degradation and formatting the soil structure.
During the 1990s there was an effort to expand ecological risk assessment to more accurately reflect the reality of the structure, function, and scale of ecological structures.
In recent years, the regional ecological risk assessment has not only focused on the former study of chemicals and biological species toxicity, but also based on environmental chemistry, ecology, toxicology, applied physics, mathematics and computer science techniques to predict pollutants harmful effects on the ecosystem [1] in China.

In this paper, consider the fundamental processes that govern the process of (QDOLEDs) by studying working variation in a variety of (QDOLEDs) structures.
Fig. 1 shows three structures of the QDOLEDs.
A one layer device is the basic structure of an OLED.
Yang, Solution-processed organic light-emitting devices with two polymer light-emitting units connected in series by a charge-generation layer, Journal of Materials Chemistry, (2012), 1-5

Due to the supercritical evaporation technology has material excellent thermal insulation performance (its porosity normally exceeds 90%) because of its nano-porous structure with an average diameter in the range from 20 to 40 nm, and very small solid grain size approximately 2 – 5 nm [5].
Aerogel structure was made of randomly arranged fine fibres and the surface of the insulation boards was hydrophobized.
This materials performance we assign to the high total open porosity of both materials and randomly oriented fibre structure of aerogel insulation.
Authors’ brief introduction The authors are members of the Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic.

The paper structure includes biomass and gasification research (Section 2), methodology and modeling (Section 3), simulation, real-world results, discussion, and analysis (Section 4), and conclusions (Section 5). 2.0 Previous Work on Gasification Stove A review of recent research on gasification stoves, biomass fuels for gasification stoves, designs for previous stoves, performance analysis, and material analysis is presented in this section. 2.1 Biomass Gasification Process Carbon monoxide, hydrogen, and carbon dioxide are produced when organic or fossil-based carbonaceous materials are gasified by using high temperatures (>700°C) without combustion.
Gasification requires a series of physical changes and chemical reactions within the gasifier to achieve its chemistry.
Materials and structures subjected to forces were analyzed to determine their stresses and strains.
ANSYS Fluent's meshing tools were employed to create a structured or unstructured mesh, depending on the complexity of the geometry.

Therefore, several studies have been recently proposed for understanding the behaviour of concrete made with different types of recycled aggregates [2], and, among them, a clear focus was placed on using aggregates derived from the demolition of concrete members and structures, generally referred to as Recycled Concrete Aggregates (RCAs).
First of all, RCAs under investigation were received from different sources, such as demolished concrete structures and from some crushed concrete samples already tested in laboratory.
Crow, The concrete conundrum, Chemistry World. 5(3) (2008) 62-66
J. of Concrete Structures and Materials. 7(1) (2013) 61-69

The Kupferschiefer and the Delitzsch structure were not mined so far in Saxony and can be considered as relevant future resources [5].
Even after more than 20 years without a producing ore mine Saxony retains all structures, networks and regulations needed for a successful re-launch of ore and spar mining.
In all cases, the arsenic is an unwanted impurity and its presence causes great concern due to its potential impact on process chemistry and its potential hazard to the environment.
Bevilaqua 1; 1Institute of Chemistry, Sao Paulo State University, Araraquara/BR 018 Biotechnical selenate removal in inverse fluidized bed reactor K.
Rudolph1; 1Helmholtz-Zentrum DresdenRossendorf, Dresden/D 029 The surface chemistry characterization during bioleaching and biooxidation S.

This feature, coupled with high reaction temperatures (>2000K), makes it difficult to synthesize nanoscale structures with high surface area.
General Definitions Typically, SCS involves a self-sustained reaction in a solution of metal containing oxidizer (e.g. metal nitrite) and fuels which can be classified based on the chemical structure of the fuel, i.e. type of reactive groups (e.g. amino, hydroxyl, carboxyl) bonded to a hydrocarbon chain.
Obviously, this steady-state propagating mode allows very precise control of the material composition and structure, as compared to the conventional VSC scheme, and more important that it produces finer products.
SEM micrograph of the as synthesized pure Ni for φ = 1.25 (Fig. 7a) presents a typical morphology of the SC products, i.e. highly porous structure with tightly agglomerated nano-crystallites with individual size well below 50 nm (see insert).
Aruna,Chemistry of nanocrystalline oxide materials: combustion synthesis, properties and applications, (World Scientific, Singapore 2008) [9] A.S.

METALLURGICAL AFFECTS OF THREE DIMENSIONAL PRINTING BASED RAPID CASTING SOLUTION Rupinder Singh1, a 1Department of Production Engineering, GNDEC, Ludhiana, India aemail: rupindersingh78@yahoo.com Keywords: Three dimensional printing; rapid castings; mechanical properties; micro structure.
Fig.5), at 10mm shell wall thickness, mixed grain with uniform distribution have been observed, whereas at other shell wall thickness dendrite structures have been observed.
This may be because of better heat transfer rate conditions, which results into refine grain structure (with no dendrites).
At shell wall thickness of 9mm, 11mm, the spikes tend to form side arms, producing a dendritic structure, which was not observed at other shell wall thicknesses.
[19] Stampfl J. and Liska R., New materials for rapid prototyping applications, Macromolecular Chemistry and Physics.