نتایج جستجو برای: ring components
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Ring network design problems have many important applications, especially in the field of telecommunications and vehicle routing. Those problems generally consist of constructing a ring network by selecting a node subset and corresponding direct links. Different requirements and objectives lead to various specific types of NP-hard ring network design problems reported in the literature, each wi...
In the crystal structure of the title compound, C(30)H(24)N(4)O(2)S, the dihydro-quinoxaline fused-ring system is disordered over three orientations in a 0.358 (2):0.318 (3):0.324 (3) ratio; the mean planes of the non-H atoms of the disorder components are aligned at 4.0 (3), 11.8 (4) and 41.7 (2)° with respect to the pyrazole ring. The rings of the phenyl and tolyl substituents are aligned at ...
In the structure of the title compound, [Fe(C(5)H(5))(C(15)H(15)N(2)O)]·H(2)O, the unsubstituted cyclo-penta-diene (Cp) ring is disordered over two positions, with site-occupancy factors of 0.636 (12) and 0.364 (12). The dihedral angles between the planes of the substituted Cp ring and the major and minor components of the disordered ring are 0.8 (3) and 3.4 (6)°, respectively. The crystal pack...
Let I denote an ideal of a local Gorenstein ring (R, m). Then we show that the local cohomology module H I (R), c = height I, is indecomposable if and only if V (Id) is connected in codimension one. Here Id denotes the intersection of the highest dimensional primary components of I. This is a partial extension of a result shown by Hochster and Huneke in the case I the maximal ideal. Moreover th...
The cortical endoplasmic reticulum (ER), an elaborate network of tubules and cisternae [1], establishes contact sites with the plasma membrane (PM) through tethering machinery involving a set of conserved integral ER proteins [2]. The physiological consequences of forming ER-PM contacts are not fully understood. Here, we reveal a kinetic restriction role of ER-PM contacts over ring compaction p...
Between April and September 2017 in the final stages of Cassini Saturn Orbiter mission spacecraft executed 22 orbits passing planetward innermost ring, D-ring. During all periapsis passes oscillations were detected azimuthal magnetic field components on typical time scales a few minutes. We argue that these time-varying signals are also primarily plasma frame. Furthermore, we show nearly exhibi...
In the title compound, C(14)H(15)NO(6)S, the thia-zine ring adopts a distorted half-chair conformation. The structure displays several cooperative weak inter-molecular C-H⋯O hydrogen-bonding inter-actions, giving rise to a two-dimensional sheet packing motif. The CH(2) group in the meth-oxy linker to the oxirane ring, and the CH group in that ring, exhibit twofold positional disorder. The three...
The gravitational interaction of dust in the zodiacal cloud with individual planets is expected to give rise to ringlike features: Such a circumsolar ring has been observed associated with Earth, but such resonance rings have not been confirmed to exist for other planets. Here, we report on sensitive photometric observations, based on imaging from the STEREO mission, that confirm the existence ...
The mol-ecular structure of the title compound, [Fe(C(5)H(5))(C(13)H(9)N(2))], (I), is analogous to that of the compound (Z)-3-ferrocenyl-2-phenyl-acrylonitrile [Cao & Ye (2008). Acta Cryst. E64, m822], (II), with the pyridine ring in (I) replacing the benzene ring in (II). While the corresponding bond distances and angles in the two compounds show no significant differences, the two dihedral a...
Let R be an Abelian exchange ring. We prove the following results: 1. RZ2 and RS3 are clean rings. 2. If G is a group of prime order p and p is in the Jacobson radical of R, then RG is clean. 3. If identity in R is a sum of two units and G is a locally finite group, then every element in RG is a sum of two units. 4. For any locally finite group G, RG has stable range one. All rings in this note...
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