737 research outputs found
2-Carboxy-1-(3-nitrophenyl)ethanaminium perchlorate
In the title compound, C9H11N2O4
+·ClO4
−, the organic cations form centrosymmetric dimers via a pair of O—H⋯O hydrogen bonds between the carboxyl groups. In the crystal, N—H⋯O interactions between the protonated amine group and the perchlorate anions and the nitro group connect the components into a two-dimensional network parallel to (001)
2,4-Dimethylanilinium perchlorate
The crystal packing of the title compound, C8H12N+·ClO4
−, is stabilized by N—H⋯O hydrogen bonds, the protonated amine group acting as a hydrogen-bond donor with the perchlorate O atoms as acceptors. These connect neighbouring cations and anions, forming a two-dimensional network. Variable-temperature dielectric constant measurements on the salt indicated that no distinct phase transition occurred within the measured temperature range of 80–293 K
Identifying vital edges in Chinese air route network via memetic algorithm
Due to its rapid development in the past decade, air transportation system
has attracted considerable research attention from diverse communities. While
most of the previous studies focused on airline networks, here we
systematically explore the robustness of the Chinese air route network, and
identify the vital edges which form the backbone of Chinese air transportation
system. Specifically, we employ a memetic algorithm to minimize the network
robustness after removing certain edges hence the solution of this model is the
set of vital edges. Counterintuitively, our results show that the most vital
edges are not necessarily the edges of highest topological importance, for
which we provide an extensive explanation from the microscope of view. Our
findings also offer new insights to understanding and optimizing other
real-world network systems
Oxonium 2-carboxy-3-(2-furyl)acrylate
In the title compound, H3O+·C8H5O5
−, neighbouring cations and anions are linked by O—H⋯O hydrogen bonds, forming a one-dimensional chain framework along [001]. The crystal structure is further stabilized by π–π interactions, with centroid–centroid distances of 3.734 (3) Å
2-Carboxy-1-phenylethanaminium nitrate
In the title salt, C9H12NO2
+·NO3
−, the cation and anion are linked by a bifurcated N—H⋯(O,O) hydrogen bond. The crystal packing is stabilized by intermolecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds, which connect neighbouring cations and anions, resulting in a two-dimensional network
3,5-Dicarboxyanilinium nitrate dihydrate
In the crystal of the title compound, C8H8NO4
+·NO3
−·2H2O, the 5-ammonioisophthalic acid cations, the nitrate anions and the water molecules are linked by N—H⋯O, O—H⋯O and C—H ⋯O hydrogen bonds into a three-dimensional network. The structure is further stabilized by aromatic π–π stacking interactions, with centroid–centroid separations of 3.827 (2) Å
Noise in Genotype Selection Model
We study the steady state properties of a genotype selection model in
presence of correlated Gaussian white noise. The effect of the noise on the
genotype selection model is discussed. It is found that correlated noise can
break the balance of gene selection and induce the phase transition which can
makes us select one type gene haploid from a gene group.Comment: 8 pages, 4 figure
2,2′-Bis(4-nitrophenoxy)-1,1′-binaphthyl
The title compound, C32H20N2O6, was synthesized by the reaction of 1,1′-binaphthyl-2,2′-diol and 4-nitrophenol in the presence of K2CO3. The two naphthalene systems make a dihedral angle of 73.70 (5)°. The crystal packing involves molecules connected by C—H⋯O hydrogen bonds into a chain along the c axis
catena-Poly[cadmium(II)-μ-benzene-1,2-diamine-κ2 N:N′-di-μ-chlorido]
The title compound, [CdCl2(C6H8N2)]n, is a coordination polymer prepared by the hydrothermal reaction of cadmium chloride and o-diaminobenzene. The cadmium cation, located on an inversion center, is octahedrally coordinated by four Cl atoms at equatorial sites and two N atoms from two ligands at the axial sites. Cd atoms are bridged by Cl atoms, forming extended chains parallel to [010]. Neighboring chains are connected by N—H⋯Cl hydrogen bonds
Current Reversals in a inhomogeneous system with asymmetric unbiased fluctuations
We present a study of transport of a Brownian particle moving in periodic
symmetric potential in the presence of asymmetric unbiased fluctuations. The
particle is considered to move in a medium with periodic space dependent
friction. By tuning the parameters of the system, the direction of current
exhibit reversals, both as a function of temperature as well as the amplitude
of rocking force. We found that the mutual interplay between the opposite
driving factors is the necessary term for current reversals.Comment: 9 pages, 7 figure
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