Star types

In the multi-channel version comprising 10 packed-bed reactors (Figure 5.14), the gas flow is distributed by star-type manifolds to the 10 reaction units [11,12],... 

Russell explains spectra of carbon stars (types R, N, S) as consequence of reversal of the usual C/O ratio. 

The main characteristic of cluster-type indices is that all bonds are connected to the common, central atom (star-type structure). The third-order cluster molecular connectivity index (3yc) is the first, simplest member of the cluster-type indices where three bonds are joined to the common central atom [102-104, 111-113,152-154,166,167,269]. The simplest chemical structure it refers to is the non-hydrogen part of ferf-butane. This index is then calculated using Eq. (43) ... 

It is worth noting in passing that the ratios O/Fe, Mg/Fe, Si/Fe, Ca/Fe and Ti/Fe in the ejected matter are roughly three times greater than their solar counterparts. These excesses of a nuclei are observed in ancient stars of the galactic halo, suggesting that the explosion of massive stars (type II supernovas) may have produced them (see Chapter 8). 

It can therefore be concluded that the aggregation of the monofunctional molecules in dilute solution of a nonpolar solvent leads to the formation of star-type inverse micelles of narrow molecular weight distribution. In addition, the extremely small CMC shows that the relative amount of material dissolved as unimers can be neglected at concentrations above 1%. 

There are many polymer architectures beyond chains such as stars, combs, and brushes. An example of a star-type oligophenylene is structure 100.276 It can be described as possessing three oli-... 

Variable Stars Oscillation Period Star type Distance Markers... 

Cepheid variable star—type of star that varies in brightness as the star pulsates in size. Cephied variables are important distance yardsticks in establishing the distance to nearby galaxies. 

Fig. 32.15 Staghorn calculus in the common bile duct and the two branches of the common hepatic duct (so-called Mercedes-star type) in primary sclerosing cholangitis...

Novikov (1938) proved the uniqueness theorem for a star-type body with the given homogeneous density distribution p(r) = pg. The theorem states that if it is known that the gravity field is generated by a star-type body with the a given constant density, the gravity inverse problem has a unique solution. In the case of spherical balls, this result is obvious according to formula (1.39), if pj = P2, then R — H-2 ... 

Multiarm heteroblock star-type copolymers of poly(lactic acid) (PLA) and poly(e-CL), poly(LA-co-e-CL) were prepared via a chemoenzymatic route [90]. Firstly, ROP of e-CL was initiated regioselectively from 6-OH site of ethyl glucopyrano-side (EGP) (see also above) using porcine pancreatic lipase as catalyst followed by termination of the EGP-PCL-OH terminus by lipase-catalyzed acetylated using vinyl acetate. Subsequently, Sn-catalyzed ROP of lactide was initiated from 2-, 3- and 4-OH groups of EGP to give a copolymer consisting of one poly(e-CL) arm with M = 1300 and three PLA arms so that the M of the final product was 11500 (Scheme 4.25). 

Scheme 4.25 Synthesis of multiarm heteroblock star-type copolymer via chemoenzymatic route.

In discussing supemovae, one frequently encounters the terms Type la, Ib, and Ic and Type II supemovae. These are spectroscopic classifications. Type I supemovae do not have hydrogen in their spectra, while Type II do. The subclassification of Type I supemovae denotes whether they have silicon or helium in their spectra. Type la supemovae do not have hydrogen or helixim in their spectra but do have silicon. Type Ib supemovae do not have hydrogen or silicon in their spectra, but do have helium. Type Ic s show no hydrogen, helium, or silicon in their spectra. The connection to core-collapse or thermonuclear supemovae discussed above is that Type la supemovae are probably thermonuclear explosions of white dwarf stars. Type II supemovae are probably core-collapse explosions of massive stars. Type Ib and Ic supernova are probably also core-collapse explosions but of massive stars that have lost... 

FIGURE 2.3 Schematic representation of linear polymers, short- and long-chain branching (brush) polymers, star-type polymers, and cross-linked polymer chains. The dendrimer structure on the right is an extreme form of highly short-chain branched macromolecules. 

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