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System isolated, importance

Today two directions of research are of interest On the one hand, investigations on the reactivity of basic systems are important to elucidate the typical" Si=E-multiple bond properties, in particular with respect to their use as synthons in organo silicon chemistry without being hampered in their synthetical potential by bulky substituents in this context, a comparison on their reactivity with the carbon analogues is still attractive. On the other hand, the isolation of new stable unsaturated silicon compounds and their structure determination continues to be of interest for quite a number of research groups worldwide. [Pg.79]

If the temperature of a water mass is altered after having been isolated from the sea surfece, deviations from saturation can result. Such alterations are a consequence of heat transport via either conduction (molecular diffusion of heat) or turbulent mixing of adjacent water masses. In the case of the former, hydrothermal systems are important subsurface heat sources. If two water masses of different temperature imdergo turbulent mixing, the temperature of the admixture will differ from that of the source waters. [Pg.157]

Isolation and containment of flammable or toxic vapors and gases within a drainage system is important to prevent their spread through the system to other locations well away from where the release or spill occurred. Isolation and containment of vapors and gases can prevent fires and explosions from propagating back to process areas or between process areas. The primary means of isolation and containment of flammable or toxic vapors and gases in drainage systems are ... [Pg.243]

The IRT method was applied initially to the kinetics of isolated spurs. Such calculations were used to test the model and the validity of the independent pairs approximation upon which the technique is based. When applied to real radiation chemical systems, isolated spur calculations were found to predict physically unrealistic radii for the spurs, demonstrating that the concept of a distribution of isolated spurs is physically inappropriate [59]. Application of the IRT methodology to realistic electron radiation track structures has now been reported by several research groups [60-64], and the excellent agreement found between experimental data for scavenger and time-dependent yields and the predictions of IRT simulation shows that the important input parameter in determining the chemical kinetics is the initial configuration of the reactants, i.e., the use of a realistic radiation track structure. [Pg.92]

These isolations of highly reactive prototype systems are important for our understanding of chemical bonding. [Pg.1145]

The vitro synthesis of amino acid conjugates has not been demonstrated with enzyme systems Isolated from plants in spite of the great Importance of these enzymes to our understanding of the mode of action and metabolism of lAA, NAA, and 2,4-D (56). However, it appears that these enzymes can be Induced by exogenous 2,4-D,... [Pg.91]

Studied and has been shown to be extremely sensitive to the presence of H-bonds in its vicinity (12-14). It also pnt into evidence the weak H-bonds N2 molecules accept, a result that may have important consequences in atmospheric chemistry. We cannot sufficiently stress the interest of these resnlts that have been collected nsing these methods, and which eventnally gave us a precise understanding of the original properties of simple H-bonds, snch as their spectroscopic properties we describe in this chapter, but also of their thermodynamic properties, and of the reactivity of H-bonds we describe in Ch. 6. This is crncial, becanse we shall see in aqneons systems the importance of the interactions of H-bonds, more precisely in the H-bond networks that appear with the presence of H2O molecnles, and which have collective properties we conld have hardly nnderstood and could not have defined if we had previonsly not got a precise knowledge of the properties of isolated H-bonds. It could be achieved thanks to the hypersensitivity of IR spectroscopy to H-bonds. Microwave spectroscopy, described in Ch. 3, is also a precise technique, in particular for what concerns the geometrical parameters of these simple H-bonded systems. The sensitivity of IR spectroscopy has more general impact, as IR spectroscopy is a method of a much wider application that may also be nsed with liqnids and solids. Its sensitivity may then be used to study systems where the number of H-bonds is small. [Pg.88]

Due to the structure of natural rubber, with its conjugated system of double bonds and the ability to reduce the unwanted dynamic motions associated with a mounting system, isolation is its most important use. However, natural rubber use in seals and gaskets is a natural fit. The automotive chemist chooses natural rubber for several reasons. The elastic behavior of rubber can be attributed to electrostatic strain... [Pg.120]

In this part, the breakup of polymer drops wUl be discussed, initially dealing with dilute systems (isolated drops) and subsequently with concentrated dispersions where coalescence is of equal importance. Dispersion in Newtonian systems was discussed in 7.S.2.2. Emulsion microrheology. [Pg.492]

Before going on to consider more complicated systems, we review here some of the basic behavior of a two-state quantum system in the presence of a fast stochastic bath. This highly simplified bath model is useful because it allows qualitatively meaningful results to be obtained from a density matrix calculation when bath correlation functions are not available in fact, the bath coupling to any given system operator is reduced to a scalar. In the case of the two-level system, analytic results for the density matrix dynamics are easily obtained, and these provide an important reference point for discussing more complicated systems, both because it is often possible to isolate important parts of more complicated systems as effective two-level systems and because many aspects of the dynamics of multilevel systems appear already at this level. An earlier discussion of the two-level system can be found in Ref. 80. The more... [Pg.98]

The principle of conservation states that certain measurable properties of an isolated system remain constant despite changes in the system. Two important principles of conservation are the conservation of mass and charge. [Pg.78]

This concept of cycle validation is even more important due to the breakthrough of the ALUS (Automatic Loading Unloading Systems), isolation technologies, and RABS (Restricted Access Biological Systems) which make product temperature control and monitoring very difficult if not almost impossible to handle. [Pg.525]

Another study in the same maimer using garhc powder (1 % added to a standard chow for an 8-week period) also showed significantly reduced ischemia reperfusion-induced ventricular fibrillation (VF) in isolated perfused rat heart and suggested that an intact alliin-alliinase system is important for this activity of garhc... [Pg.3684]

Most important is the measuring system isolation, which can assure no exchange of heat and mass isolated), enabling only heat exchange closed) and making possible that all components are exchangeable open). Most usually,... [Pg.382]


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See also in sourсe #XX -- [ Pg.12 ]




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