Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Definitions, importance

Electrochemistry provides routes to directly prepare nanostructures both delocalized in a random or organized way and localized at predefined surface sites with adjustable aspect ratios. Purity, monodispersity, ligation, and other chemical properties and treatments are definitely important in most cases. By delocalized electrodeposition it is possible to decorate large areas of metal or semiconductor surfaces with structures of a narrow size distribution stable nuclei-clusters can be... [Pg.153]

The discussion in this chapter is limited to cyanine-like NIR conjugated molecules, and further, is limited to discussing their two-photon absorption spectra with little emphasis on their excited state absorption properties. In principle, if the quantum mechanical states are known, the ultrafast nonlinear refraction may also be determined, but that is outside the scope of this chapter. The extent to which the results discussed here can be transferred to describe the nonlinear optical properties of other classes of molecules is debatable, but there are certain results that are clear. Designing molecules with large transition dipole moments that take advantage of intermediate state resonance and double resonance enhancements are definitely important approaches to obtain large two-photon absorption cross sections. [Pg.142]

The stoichiometry of the redox processes relevant for wastewater is important for balancing these processes. Therefore, procedures are needed for this purpose. A basic definition important for the determination of process stoichiometry is the oxidation level, OX, defined as follows an imaginary charge of an element for being stabilized in a molecule compared with a corresponding low stability of the single atom. [Pg.17]

Now suppose the BluePhone analysts extend their interest to CustomerCare and decide that the contents of that package need to refer to both faults and accounts (see Figure 7.22). If CustomerCare is unfolded, are there two copies of the definitions imported from Network Not really. [Pg.337]

These groups have a definite, important, physical meaning. The Reynolds number is the ratio of inertial forces to viscous forces, the Sherwood number the ratio of mass transfer resistance in fluid film to mass transfer in bulk fluid, and Schmidt number the ratio of momentum diffusivity to mass diffusivity. [Pg.527]

SYNTHESIS. Crystals of lead iodide growth on earth were formed only on the lower half of the membrane Indicating that gravitational effects are definitely Important. The exact reason for the absence of crystals... [Pg.6]

To sum up, the main mode of extraction of dissolved silica coming into the seas and oceans from the weathered layer is biogenic precipitation—a process widespread both in recent and in ancient sedimentary basins. Biogenic precipitation of silica from undersaturated solutions could also have been of definite importance in the formation of the Precambrian iron cherts, but no direct evidence has been obtained as yet. [Pg.179]

The DlOP-rhodium(I) complex attached to organic polymers , e.g., polystyrene resin and poly(methyl vinyl alcohol), exhibits good catalytic activity as a chiral catalyst comparable to the corresponding homogeneous catalyst. In contrast, the rhodium(I) complexes anchored on inorganic supports display only a low efficiency . Studies show that the steric requirements for a match of the chiral ligand, a hydrosilane and a ketone are of definite importance in bringing about effective asymmetric induction. [Pg.347]

Defense Mechanism Short Definition Important Associations... [Pg.683]

Recently many quantum chemists have dedicated a lot of elforts to the calculation and treatment of the electronic structures of polyatomic systems including heavy elements, which are involved in many interesting chemical and physical phenomena. They still present unique difficulties to the theoretical study. Until recently, the relativistic effect had ever been thought less important for chemical properties because the relativity appears primarily in the core electrons, which had been believed to be unlikely to affect chemically active valence regions dramatically. Recent studies, however, have revealed not only quantitatively but also quahtatively that the relativistic effect plays essential and comprehensive roles in total natures of molecular electronic structures for heavy-element systems. We are nowadays convinced that the relativistic effect is definitely important for the accurate theoretical treatment of heavy-element systems as well as the electron correlation effect. [Pg.541]

Define hydrodynamic particle size and particle size in air. How are the differences in definition important to predicting risk to lung ... [Pg.766]

Equation 12.5.b-8 is the same as Eq. I2.5.b-4 except for the term in the latter with D 2, representing direct effective particle-to-particle transport. For several types of situations, this term may be of definite importance mass transfer in highly porous solids at low Reynolds numbers (Wakao [63]) and the heat transfer situation discussed by Littman and Barile [61], which is analogous to the model for radial heat transfer proposed by De Wasch and Froment [62]. [Pg.629]

Importers are not specifically mentioned in the statutory or regulatory statements of the PMN requirement, but in both the statute and the regulations manufacture is defined to include both manufacture and import and so all of the premanufacture notification rules that apply to manufacturers also apply to importers. Importers do not need to ensure that substances in articles are on the Inventory because articles are exempt from the PMN process. However, it is important to review the definition of article to check that all of the substances in the article meet the definition. Importers must file PMNs on all new chemicals that they import in bulk or as part of a mixture. ... [Pg.101]

All the facts described here clearly indicate that the steric requirement for a match of the chiral ligand, a hydrosilane and a ketone is of definite importance in order to bring about an effective asymmetric induction. However, it is not understandable why the two catalysts, (BMPP)2Rh(SX l (8) and (DIOP)Rh(SX l (6), behave differently in activating monohydrosilanes. [Pg.202]

Some definitions important for these lens-imaging microscopes should be given now. The depth... [Pg.18]

It is definitely important to focus on building a system of health protection as a basic element of constructing a system of safety culture and its implementation in management procedures within a company if we take into consideration the information that four percent of gross domestic product (GDP) of most countries is lost due to injuries (ILO data). [Pg.33]

Fakirov S (2015) Is the use of correct terms and definitions important in creation of new materials Expr Polym Lett 9(8) 671... [Pg.200]

Fakirov S (2015) Composite materials—is the use of proper definitions important Mater Today 18(10) 529... [Pg.200]


See other pages where Definitions, importance is mentioned: [Pg.355]    [Pg.132]    [Pg.234]    [Pg.253]    [Pg.160]    [Pg.399]    [Pg.163]    [Pg.46]    [Pg.366]    [Pg.337]    [Pg.224]    [Pg.80]    [Pg.159]    [Pg.341]    [Pg.1511]    [Pg.155]    [Pg.596]    [Pg.159]    [Pg.139]    [Pg.126]    [Pg.18]    [Pg.287]    [Pg.56]    [Pg.186]    [Pg.304]    [Pg.165]    [Pg.473]   
See also in sourсe #XX -- [ Pg.17 ]




SEARCH



Gasification - Important Concepts and Definitions

Import definition

Import definition

Important Definitions

Important Definitions

Important definitions and descriptions

Importer, definition

Principal importer definition

Some Important Definitions

Some Important and Useful Definitions

Some other definitions of important thermodynamic functions

Terms and Definitions Important in Polyethylene Fabrication

© 2024 chempedia.info