Xem 1-14 trên 14 kết quả Matter characterization
  • Soft matter (or soft condensed matter) refers to a group of systems that includes polymers, colloids, amphiphiles, membranes, micelles, emulsions, dendrimers, liquid crystals, polyelectrolytes, and their mixtures. Soft matter systems usually have structural length scales in the region from a nanometer to several hundred nanometers and thus fall within the domain of “nanotechnology.” The soft matter length scales are often characterized by interactions that are of the order of thermal energies so that relatively small perturbations can cause dramatic structural changes in them.

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  • This volume is an update of the book, Soil Sampling and Methods of Analysis, first published in 1993. The aims of this second edition remain the same as those of the earlier edition—to provide a compilation of soil analytical and sampling methods that are commonly used, straightforward, and relatively easy to use. The materials and procedures for these methods are presented with sufficient detail and information, along with key references, to characterize the potential and limitation of each method....

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  • An Introduction to the Study of Mineralogy is a collection of papers that can be easily understood by a wide variety of readers, whether they wish to use it in their work, or simply to extend their knowledge. It is unique in that it presents a broad view of the mineralogy field. The book is intended for chemists, physicists, engineers, and the students of geology, geophysics, and soil science, but it will also be invaluable to the more advanced students of mineralogy who are looking for a concise revision guide....

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  • It is important to note, however, that no matter how or if they change, UN agencies and other global entities can only be as useful as individual governments allow them to be. The agencies serve the governments, which have ultimate responsibility for overseeing service provision for their citizens. Global partners can and should offer extensive support to governments that show a clear interest in developing realistic policies and programmes to reduce vertical transmission.

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  • The order of writing presented here highlights the importance of your results for defining the focus of your article. You should define the focus of your article based on the evidence you have. This way you can set the focus of your article relatively early and avoid unnecessary re-working when writing up the theory and other elements of the text. It is sensible to start writing an article by outlining the subject matter and content by a few bullet points or key words. This phase will act later as an aid in writing the introduction. After outlining the...

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  • Waste incinerators fall somewhere between the two categories of incidental and deliberate emissions. Similar to a coal plant, they burn a feedstock — in this case garbage — and mercury is released as an incidental emission. The difference is that most of the incidental emissions from waste incinerators are a result of mercury that is deliberately put into products. These may include fluorescent lamps, old batteries, dental office waste, electrical switches or thermostats.

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  • Some physical qualities include soil density, permeability, porosity, temperature, thermal conductivity and heat capacity. These properties dictate how the biologicalmicro organisms whichfeedontheplantorganicmattersurvive.Forexamplethepenetrationofheat,waterand otheressentialorganicresiduedependsonthedensityofthesoil.Bioenergycropswiththeir extensiveandheavyrootsystemhaveanessentialroletoplayhere. Inadditionto increasing thesoilcarboncontenttheycanimprovesoildensityandporosity....

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  • A new 3 -acetoxy-urs-23,28,30-trioic acid, named acantrifoic acid B (1), has been isolated from the leaves of Acanthopanax trifoliatus. Its chemical structure has been characterized on the basis of spectral and chemical evidence. I - INTRODUCTION Acanthopanax trifoliatus (L.) Merr., (Araliaceae) is distributed in North Vietnam and used in the folk medicines of south–east Asia (Chi, 1997; Loi, 2001) as a drug with ginsenglike activity. Lupane-triterpene carboxylic acids and a lupane-triterpene glycoside have been reported from the leaves of A. trifoliatus (Ty et al.

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  • Over the past few decades numerous studies have shown an alarming increase in the concentration of atmospheric particular matter called aerosols resulting from a variety of human activities, ranging from agricultural to combustion of fossil fuels. Besides having serious impacts on the health of all living creatures, these particles can affect planetary radiation budget. Consequences of this change include global temperature shifts and the altering of atmospheric and oceanic circulation patterns.

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  • All the phenomena of nature are characterized by motion; this is an essential property of matter, having infinity of aspects. For instance, the motion can be mechanical, physical, chemical and biological; there correspond various sciences of nature. Among them, mechanics studies the objective laws of the mechanical motion of material bodies, the simplest form of motion of matter; we will deal with such a study in what follows. The scientific study of matter has put in evidence its existence in the form of physical systems.

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  • Field data are being integrated into well-developed and tested models to better understand and characterize aerosol pollution in Mexico City. The spatial, temporal, size, and chemical characteristics of specific emissions sources are needed to allow their contributions to PM concentrations to be distinguished from each other and to provide accurate inputs to air quality models.

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  • In 1996, the U.S. Department of Energy (DOE) and Mexico s Petr leos Mexicanos (PEMEX) began sponsoring this project to characterize the nature and sources of suspended particulate matter found in the ambient air in Mexico City. This collaborative effort follows another program sponsored by DOE and PEMEX in the early 1990 s to study gas phase pollutants and photochemical oxidants in the Valle de Mexico. 3,4 The high altitude, the year- round sunshine, and the complex atmospheric chemistry characteristic of Mexico City create a challenging laboratory for scientific research.

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  • An efficient use of lexical cohesion is described for ranking text units according to their contribution in defining the meaning of a text (textual saliency), their ability to form a cohesive subtext (textual connectivity) and the extent and effectiveness to which they address the different topics which characterize the subject matter of the text (topic aptness).

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  • We present a novel method for record extraction from social streams such as Twitter. Unlike typical extraction setups, these environments are characterized by short, one sentence messages with heavily colloquial speech. To further complicate matters, individual messages may not express the full relation to be uncovered, as is often assumed in extraction tasks.

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