Two region core

A zero-energy thermal reactor two-region core graphite moderated and reflected with carbon dioxide heating and cooling. 

The computational model used to produce the data shown in Figs. 4.1 and 4.2 was modified to substitute a stainless steel reflector for the graphite. The model was also modified to include a two-region core (to be described in a later section), and critical radius as a function of reflector thickness was computed. The results of the study are shown in Figs. 4.3 and 4.4. For comparable reflector thicknesses, reactor volumes and masses were lower for graphite reflectors than for steel. 

The boundary between the two regions and the radius rc of the core is determined by the position in the cross-section at which the shear stress is exactly equal to the yield stress Ry of the fluid. Since the shear stress is linearly related to the radial position ... 

Solids Circulation Pattern. Yang et al. (1986) have shown that, based on the traversing force probe responses, three separate axial solids flow patterns can be identified. In the central core of the bed, the solid flow direction is all upward, induced primarily by the action of the jets and the rising bubbles. In the outer regions, close to the vessel walls, the solid flow is all downward. A transition zone, in which the solids move alternately upward and downward, depending on the approach and departure of the large bubbles, was detected in between these two regions. 

Despite the similar functions of each isozyme, only two regions of amino acid homology exist (X and Y), one of 150 and a second of 120 amino acid residues, which are 54% and 42% identical among the isozymes but are differentially localized within each enzyme (Fig. 20-3). The X and Y domains form the catalytic core of the enzyme. A characteristic of the (3 and 8 isoforms is that relatively few amino acids (40-110) separate the X and Y entities, whereas a much larger separation is observed for the PLCy isoform (approx. 400). In addition, in PLCy, the region between X and Y contains amino acid sequences that are found in nonreceptor tyrosine kinases (SH2 and SH3 domains). All four isoforms possess pleckstrin homology (PH) domains. The latter are considered to enable the enzyme to become tethered to the plasmalemma via an interaction with PI(4,5)P2. In addition, all PLC isoforms possess an E-F hand domain, which is located between PH and X domains, and a C2 domain, which is located close to the Y domain. 

The genetic information of eukaryotic cells is propagated in the form of chromosomal DNA. Besides the nucleic acid component, chromosomes contain architectural proteins as stoichiometric components, which are involved in the protective compaction of the fragile DNA double strands. Together, the DNA and proteins form a nucleoprotein structure called chromatin. The fundamental repeating unit of chromatin is the nucleosome core particle. It consists of about 147 base pairs of DNA wrapped around a histone octamer of a (H3/H4)2 tetramer and two (H2A-H2B) heterodimers. One molecule of the linker histone HI (or H5) binds the linker DNA region between two nucleosome core particles (Bates and Thomas 1981). 

Bovine heart cytochrome bci (PDB 1BE3 and PDB IBGY) as studied by Iwata et al. exists as a dimer in the asymmetric unit cell. Each monomer consists of 11 different polypeptide subunits (SU) with a total of -2165 amino acid residues and a molecular mass of -240 kDa. The protein subunits of the complex occupy three separate regions (1) the intermembrane space (p side) occupied by cytochrome Ci (subunit 4, SU4), the iron-sulfur protein (ISP, SU5) and subunit 8 (2) the transmembrane region occupied by cytochrome b (SU3), the transmembrane helices of cytochrome Ci and the ISP, and subunits 7,10, and 11 and (3) the matrix space (n side) occupied by two large core proteins (subunits 1 and 2) as well as subunits 6 and 9. Subunit 8 is often called the hinge protein and is thought to be essential for proper complex formation between cytochrome c (the exit point for some bci complex electrons) and... 

A cylindrical hard deposit, which is grown on the tip of a cathode (A in Fig. 10.2.2), consists of two regions an inner fibrous black core and an outer gray hard shell (15). The inner core had a columnar structure that was made up of bundles of nanotubes and flocks of polyhedral graphitic particles (32). On the other hand, the hard shell was made of stacked graphitic flakes. 

Lyfenko, A. D., Ducreux, S., Wang, Y., Xu, L., Zorzato, F., Ferreiro, A., Meissner, G., Treves, S., and Dirksen, R. T. (2006). Two Central Core Disease (CCD) Deletions in the C-Terminal Region of RYR1 Alter Muscle Excitation-Contraction (EC) Coupling by Distinct Mechanisms. Hum Mutat. 

We shall begin (Section II) by assembling the basic equipment. Section II.A formulates the problem in the complementary languages of thermodynamics and statistical mechanics. The shift in perspective—from free energies in the former to probabilities in the latter—helps to show what the core problem of phase behavior really is a comparison of the a priori probabilities of two regions of configuration space. Section II.B outlines the standard portfolio of MC tools and explains why they are not equal to the challenge posed by this core problem. 

The optical micrographs, taken in polarized light, point out the existence of two different regions in the PAN-based carbon fiber [100] a central isotropic region and an outer circumferential layer. The existence of these two regions was also observed in a previous study by TEM [97], where it was observed that the raw PAN-based carbon fiber consists of an external 2 pm ring and a core of 3 pm diameter. 

The core lies farther below the mantle, and two regions constitute the earth s core. The outer core extends from about 3000 km (1800 mi) to about 5000 km (3100 mi), and it... 

X-ray absorption spectroscopy (XAS) refers to the structured absorption occurring in the vicinity of a core-electron X-ray absorption threshold (an absorption edge ) (2-5). In the following, we restrict our attention to the Mn K-edge (Is initial state) absorption spectrum, which occurs at an energy of ca. 6500 eV (i.e., an X-ray wavelength of ca. 2 A). An XAS spectrum is conventionally divided into two regions, the X-ray ab-... 

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