Xem 1-20 trên 61 kết quả Constituent materials
  • In the last decade, we have witnessed a rapid growth in research and development of nanotechnology, especially nanostructured materials. Nanoporous materials as an important class of nanostructured materials possess high specific surface area, large pore volume, uniform pore size, and rich surface chemistry. These materials present great promises and opportunities for a new generation of functional materials with improved and tailorable properties for applications in adsorption, membranes, sensors, energy storage, catalysis and photocatalysis, and biotechnology, etc.

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  • Whatever the context, be it solid, liquid, or some transitionary setting, materials science seeks an understanding of a material's macromolecular structure and properties by drawing on knowledge of its atomic and molecular constituents. Until recently, the term ''materials science'' was used primarily to denote empirical study, fundamental research, synthesis, a

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  • Eight students in this study achieved an increase in their Overall score from Test 1 to Test 2 of one whole band and a further 14 achieved a half band increase. In other words, just over half of this sample of 40 students were able to achieve a better result in the IELTS Test when taken again after two or three years of higher education in Australia. A total of 12 students achieved the same Overall score in Test 2 as in Test 1, and six students actually regressed, dropping a half band. Of course, this is not to say...

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  • Histological assessment showed that independently of the etiological factor involved, changes of the mucosa refer both to the gingival epithelium and the lamina propria (Banita et al., 2008, 2011). There is now general agreement that all gingival overgrowth lesions contain fibrotic or expanded connective tissue with various levels of inflammation and an enlarged gingival epithelium. As soon as plaque accumulates adjacent to the gingival margin, inflammatory cells infiltrate in the subjacent connective tissue and initiate its destruction.

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  • Composites are engineered or naturally occurring materials made from two or more constituent materials with significantly different physical or chemical properties which remain separate and distinct within the finished structure. Basically, they can be categorized into two major types, i.e., structural composites with outstanding mechanical properties and functional composites with various outstanding physical, chemical or electrochemical properties. They have been widely used in a wide variety of products, e.g.

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  • Reporting that rare species are more abundant on larger islands, they make the case for greater conservation efforts on larger islands. In the next chapter, Hugo Mejía-Madrid evaluates the roles of heterochrony and ecological fitting in the evolution of helminth fish parasites. Contrary to expectations, helminth speciation lags substantially behind that of their hosts, tending to occur in pulses associated with continent jumps among hosts. Next in this section, Toshiharu Mita et al.

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  • The country case studies make clear that international partners share some of the blame, particularly because they too often fail to coordinate programs to help promote more integrated, comprehensive health care for women. However, it is equally clear that many of the obstacles are wholly local in nature: National governments and policymakers are often unable or unwilling to initiate or sustain health care programs and reforms that would improve women’s access to services and, by extension, reduce rates of vertical transmission.

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  • Progress of thermodynamics has been stimulated by the fi ndings of a variety of fi elds of science and technology. In the nineteenth century, studies on engineering problems, effi ciency of thermal machines, lead to the discovery of the second law of thermodynamics. Following development of statistical mechanics and quantum mechanics allowed us to understand thermodynamics on the basis of the properties of constituent molecules.

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  • Some flow cytometers have the ability to physically separate different sub-populations of interest (cell sorting) depending on their cytometric characteristics (stream-in-air), thus permitting the recovery and purification of cell subsets from a mixed population for further applications (Bergquist et al., 2009; Davey, 2010).

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  • Common engineering materials reach in many engineering applications such as automotive or aerospace; their limits and new developments are required to fulfill increasing demands on performance and characteristics. The properties of mate- rials can be increased, for example, by combining different materials to achieve better properties than a single constituent or by shaping the material or constituents in a specific structure. Many of these new materials reveal a much more complex behavior than traditional engineering materials due to their advanced structure or composition.

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  • There are two basic approaches of synthesizing nanowires: top-down and bottom-up pproach. In a top-down approach a large piece of material is cut down to small pieces hrough different means such as lithography and electrophoresis. In a bottom-up approach he nanowire is synthesized by the combination of constituent ad-atoms. Most of the ynthesis techniques nowadays are based on bottom-up approaches.

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  • The Presence of Hydrodynamics in Modern Sciences: Optimizing Methods and Tools “Water is the beginning of everything” (Tales of Mileto) “Air is the beginning of everything” (Anaxímenes of Mileto) Why is it important to study Hydrodynamics? The answer may be strictly technical, but it may also involve some kind of human feeling about our environment, and our (eventual) limitations to deal with its fluidic constituents.

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  • In 2008 food prices surged plunging millions back into hunger and triggering riots from Egypt to Haiti and Cameroon to Bangladesh. Whereas fuel prices, which also surged, have fallen back sharply food prices remain problematic with wheat, corn and soya still higher than they were 12-18 months ago. In order to understand the factors underpinning the food crisis and to assess trends, UNEP commissioned a Rapid Response team of internal and international experts. Their conclusions are presented in this report launched during UNEP’s 25th Governing Council/Global Ministerial Environment Forum.

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  • Most enterprises deal with a single end product, which indicates the high degree of specialisation of the enterprises in Jepara. The vast majority (95.5%) are enterprises run by a single extended family, while relatively few involved two (4.3%) or three (0.2%) separate families or lineages. Almost all enterprises had at least one other regular partner enterprise, even if there were no links in the ownership of the enterprises.

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  • The distance measure consists of three dummy variables:7 The first indicates diary weeks starting on payday, and weeks starting 1 to 7 days after payday. The second indicates weeks starting 8 to 14 days after payday. Diary weeks beginning at distances 15 to 22 are omitted from the equation and serve as the reference category. The third dummy indicates weeks beginning 4 to 1 days before the next payday. These weeks overlap the (imputed) next payday by at least three days.

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  • Movies have always had a powerful influence on people’s behavior, from how they talk to how they dress. Tobacco marketers took advantage of this power to popularize cigarettes over cigars and to make smoking by women socially acceptable. The number of women stars posing with cigarettes in the 1930s and 1940s may have been no accident. And paying stars to endorse cigarette brands in print and billboard advertising was certainly business as usual, until smoking’s link to lung cancer shattered tobacco’s glamorous image in the early 1960s....

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  • Alubaidy et al. Nanoscale Research Letters 2011, 6:375 http://www.nanoscalereslett.com/content/6/1/375 NANO EXPRESS Open Access Synthesis of magnetic nanofibers using femtosecond laser material processing in air Mohammed-Amin Alubaidy1, Krishnan Venkatakrishnan1* and Bo Tan2 Abstract In this study, we report formation of weblike fibrous nanostructure and nanoparticles of magnetic neodymiumiron-boron (NdFeB) via femtosecond laser radiation at MHz pulse repetition frequency in air at atmospheric pressure.

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  • Why is it important to study Hydrodynamics? The answer may be strictly technical, but it may also involve some kind of human feeling about our environment and our (eventual) limitations to deal with its fluidic constituents. As teachers, when talking to our students about the importance of quantifying fluids, we (authors) go to the blackboard and draw, in blue color, a small circumference in the center of the board, and add the obvious name 'Earth'.

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  • Insurance companies provided Massachusetts in the filing address in 103 of the 173 instances where the subject address was listed as New York. For these same 173 instances, 37 filers noted New York as their filing location. Filers located in Califor- nia identified New York as the subjects’ state in 53 of the 148 instances, followed by Iowa (25), and then Massachusetts (15). Only one California filer listed its own state as the filer and subject address location.

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  • Clearly, a straightforward implication of wages being determined by sectoral conditions would be that industry-level contracts offer little scope for adjustments of individual wages to firm-specific demand shocks, even if the latter are of permanent nature. However, as demonstrated in Section 2.2, industry-level contracts do not necessarily provide an obstacle to the adjustment of wages to local conditions, as recent decentralisation tendencies in Germany have introduced the option of making such wage adjustments.

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