Nature as the background

Background here means not only the back cloth of the firework display, but the whole environment. Nature means the natural order involving natural and artifical things such as sky, cloud, mountain, gorge, forest, lake, sea, ships, houses, palaces, temples, churches, shrines, lights, the moon, the sun, wilderness, desert etc. 

Weather conditions particularly disturb the beauty of fireworks and a cloudy sky especially hides the flowers of fire. Strong wind is not desirable, but no wind is equally unhelpful because it causes a large volume 

Nature cannot be controlled by man but it is possible to foresee the conditions to some extent. When we plan a firework display, we try to arrange it so that it harmonizes with these backgrounds as far as possible. 

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Ottawa 20-30 mesh sand (0.60-0.85 mm ASTM designation C778), obtained from U S. Silica Co., Ottawa, IL, was used as the porous medium for column experiments and as the background medium for box studies. Low-permeability layers were packed within Ottawa 20-30 mesh sand in 2-D box studies. The rectangular layers consisted of a natural aquifer material obtained from Wurtsmith AFB in Oscoda, Michigan and F-70 sand (Ottawa 40-270 mesh) obtained from U.S. Silica Co. Table 1 summarizes relevant properties of the porous media used in the column and 2-D box experiments. 

As the background noise in the brain is never interrupted and can even become more accentuated during sleep than in the vigilant resting state, the dreamworld, the classic example of a man-created universe, has always given inspiration to art. Its ultimate explanation awaits the resolution of scientific problems the chemistry of cortical enhancer regulation and the natural law that determines the operation of the brain and its self and is responsible for the immense variability of human activities. 

The fact that the process rate under activation control conditions is independent of the nature of the background salt cation can serve as an additional criterion for the primary nature of cathodic generation of solvated electrons. Systematic studies into the effect of this factor were made in hexamethylphosphotriamide and they... 

Since you fellows are all graduate students and therefore real scientific experts. I d like to make a quick rundown of the basic laws of Nature which serve as the background of this course. Can anyone here name a single infallible law of Nature ... 

Chemical education researchers may play various roles within departments of chemistry. The nature of the relationship will be determined by characteristics of the department - size, programmatic emphasis, history - as well as the background, expertise and interests of the researcher. In many cases, researchers in chemical education are seeking tenure through departments of-chemistry that do not have a long (or sometimes any) history of tenure decisions in the field of chemical education. 

Fig. 7. A texture of a main-chain liquid crystal polymer, X, as seen in transmitted light between crossed polars. By analogy with small molecule liquid crystal parlance, it is known as a Schlieren texture. The fine granular nature of the background is caused by crystallization on cooling otherwise the microstructure is unchanged from that in the liquid crystal state. (Photograph courtesy of T. J. Lemmon, Department of Materials Science and Metallurgy, University of Cambridge.)...

More concretely, it is natural to turn to the parallelism between 2 10-17 and 8 13-14 as the background for the poet s choice of voice. In 2 14 the Lover begs Let me see your face Let me hear your voice For your voice is sweet... 

Schlemmer et al. [124] continued this research using HR-CS AAS, where the nature of the background absorption becomes apparent, as shown in Figure 8.50. It is quite obvious from the structure of the peak that the interference is not due to an atomic line, but to some molecular absorption, although the kind of molecule that causes the absorption is yet unknown. It also becomes clear that part of the problems observed in LS AAS is the rapid change of the absorbance with time, which is difficult to follow with sequential correction systems. 

In the first step (far away from the pore), the polymer undergoes a combination of drift, due to the externally imposed force fields, and diffusion arising from collisions with solvent molecules. The drift-diffusion of the polymer is established by the structure and size of the polymer, the nature of the background fluid (such as solvent quality and ionic strength), and influences from external forces (such as electric field and pressure gradient). 

Since electrochemical reduction of the fullerene films involves incorporation of cations to form a new phase, the nature of the background electrolyte cation is the most important factor determining the electrochemical behavior of the film. Properties of the new phase, such as solubility, conductivity and kinetics of the phase reorganization affect the electrochemistry of the film. The nature of the solvent, on the other hand, mainly affects the solubility of the reduced film. Since the reduced fullerenes dissolve easily in many non-aqueous solvents (see Section 1.1), the electrochemical studies of the thin fullerene films have been limited mainly to acetonitrile with a few studies in propylene carbonate [136,144] or y-butyrolactone [151]. Unless otherwise stated, all the results described below have been obtained with acetonitrile as solvent. 

The pH of rainwater in equUibrium with atmospheric CO2 is 5.6, a value frequendy cited as the natural background pH. However, in the presence of other naturaUy occurring species such as SO2,, NH, organic acids, sea salt, and alkaline cmstal dust, the natural values of unpoUuted rainwater vary... 

The standard rates the offending noise according to its nature 5dB(A) is added where the noise has a definite continuous note and a further 5 dB(A) added for noise of an intermittent nature. The number of occasions that happen in an 8-hour period is then plotted on a graph and the correction for intermittency is derived. When these calculations have been performed, the noise level is compared to the background level. The standard states that where the noise exceeds the background by 5 dB or more, the nuisance is to be classed as marginal, and where the background is exceeded by lOdB(A) or more, complaints are to be expected. 

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