Dumb-bell

In the limit k = (a/i) /i with L < all, the system should consist of dipolar dumb-bells. The asymptotic fonn of the direct correlation fiinction (defined tln-ough the Omstein-Zemike equation) for this system (in the absence of a solvent) is given by... 

Zhou Y and Stell G 1993 Analytic approach to molecular liquids V. Symmetric dissociative dipolar dumb-bells with the bonding length o/3 = L = al2 and related systems J. Chem. Phys. 98 5777... 

C medium speed iujection mol ding mold temperature 20°C ASTM No. 1 dumb bells. 

The first group of tests is carried out on specimens generally fabricated into a dumb-bell shape, with forces applied uniaxially. The usual apparatus consists of a machine with a pair of jaws, which during the test are moved relative to each other, either together or apart, in a controlled manner. A chart recorder is employed to give a permanent record of the results obtained, so that the force at fracture can be determined. Whether this kind of set up measures tensile, compressive, or flexural strength depends on how the sample is oriented between the jaws, and on the direction that the jaws are set to travel relative to one another. 

Drying, use of absorbent cotton, 20,8, 9 Dumb-bell vacuum desiccator, 23, 105... 

Demethylation of a phenolic ether by hydriodic acid, 22, 91 Desiccator, vacuum, dumb-bell type, 23,105... 

The Sn-Cl distances in the SnCl2 dumb-bell as opposite to the Sn(P)-Cl tin centers differ by 0.3 A, which has been explained by the higher coordination of the SnCl2 tin atom. Similar complexes between cyclodiazastannanediyls with SnX2 have been reported (53). 

Ap subshell contains three p orbitals, denoted px, py and pz. A p orbital is a dumb-bell shape. 

G.-W. Wang, K. Komatsu, Y. Murata, M. Shiro, Synthesis and X-ray Structure of Dumb-Bell-Shaped C120 , Nature 1997, 387 583-586. 

The simplest case of comb polymer is the H-shaped structure in which two side arms of equal length are grafted onto each end of a linear cross-bar [6]. In this case the backbones may reptate, but the reptation time is proportional to the square of Mj, rather than the cube, because the drag is dominated by the dumb-bell-like frictional branch points at the chain ends [45,46]. In this case the dependence on is not a signature of Rouse motion - the relaxation spectrum itself exhibits a characteristic reptation form. The dynamic structure factor would also point to entangled rather than free motion. 

The term proteasome is used to describe two kinds of multisubunit proteolytic complexes, the 26S and 20S, based on their sedimentation coefficient. The 26S proteasome degrades ubiquitinated protein substrates. The 26S complex contains the 20S as a core and regulatory caps on either end like a dumb bell. Each cap of the 26S proteasome is known as the 19S regulatory complex (19S RC). The 20S core is a cylindrical structure consisting of the catalytic part of the proteasome. ... 

The wavefunction of an electron associated with an atomic nucleus. The orbital is typically depicted as a three-dimensional electron density cloud. If an electron s azimuthal quantum number (/) is zero, then the atomic orbital is called an s orbital and the electron density graph is spherically symmetric. If I is one, there are three spatially distinct orbitals, all referred to as p orbitals, having a dumb-bell shape with a node in the center where the probability of finding the electron is extremely small. (Note For relativistic considerations, the probability of an electron residing at the node cannot be zero.) Electrons having a quantum number I equal to two are associated with d orbitals. 

It will be obvious that the treatment of the present section can also be applied to the subchain model (77). As is well-known, this model where every junction point of subchains is assumed to interact with the surroundings, seems to provide a more realistic description of the dynamic behaviour of chain molecules than the simple model used in the proceeding paragraphs, viz. the elastic dumb-bell model where only the end-points of the chain are assumed to interact with the surrounding. One of the important assumptions of the subchain model is that every subchain should contain enough random links for a statistical treatment. From this it becomes evident that the derivations given above for a single chain, can immediately be applied to any individual subchain. In particular, those tensor components which were characterized by an asterisk, will hold for the individual subchains as well. 

This latter result has been obtained with the aid of the dumb-bell model by Hermans (61) as early as in 1943. Introducing the well-known molecular weight averages ... 

C0Pi6 (137) was the first to give an expression for the contribution of the form birefringence to the Maxwell constant. His theory is based on the elastic dumb-bell model, which has been used in early theories on flow birefringence and viscosity and which is identical with the model used in Sections 2.6.1 and 2.6.2. The ratio of Maxwell constant to intrinsic viscosity is probably unaffected by this simplification, when also the viscosity is calculated with the same model, as Copi6 did. For the absence of the form effect, this has strictly been shown in the mentioned Sections. In fact, in the case of small shear rates the situation is rather simple To a first approximation with respect to shear rate, the chain molecules are only oriented, their intramolecular distances which are needed for the calculation of form birefringence, being unaffected. 

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