174 research outputs found
Dichloridobis(4-pyridylmethyl 1H-pyrrole-2-carboxylate-κN)zinc
In the title molecule, [ZnCl2(C11H10N2O2)2], the ZnII ion, situated on a twofold axis, is in a distorted tetrahedral coordination environment formed by two chloride anions and two pyridine N atoms of the two organic ligands. In the pyrrole-2-carboxylate unit, the pyrrole N—H group and the carbonyl group point approximately in the same direction. The dihedral angle between the two pyridine rings is 54.8 (3)°. The complex molecules are connected into chains extending along [101] by N—H⋯Cl hydrogen bonds. The chains are further assembled into (-101) layers by C—H⋯O and C—H⋯Cl interactions
meso-5,5′-Bis[(4-fluorophenyl)diazenyl]-2,2′-(pentane-3,3-diyl)di-1H-pyrrole
There are two independent molecules in the asymmetric unit of the title compound, C25H24F2N6, in which the N=N bonds adopt a trans configuration with distances in the range 1.262 (2)–1.269 (3) Å. The dihedral angles between heterocycles are 86.7 (2) and 85.6 (2)° in the two molecules while the dihedral angles between the heterocylic rings and the adjacent benzene rings are 13.4 (2) and 13.4 (2)° in one molecule and 5.3 (2) and 6.5 (2)° in the other. In the crystal, pairs of independent molecules are held together by four N—H⋯N hydrogen bonds, forming interlocked dimers
Potential destination discovery for low predictability individuals based on knowledge graph
Travelers may travel to locations they have never visited, which we call
potential destinations of them. Especially under a very limited observation,
travelers tend to show random movement patterns and usually have a large number
of potential destinations, which make them difficult to handle for mobility
prediction (e.g., destination prediction). In this paper, we develop a new
knowledge graph-based framework (PDPFKG) for potential destination discovery of
low predictability travelers by considering trip association relationships
between them. We first construct a trip knowledge graph (TKG) to model the trip
scenario by entities (e.g., travelers, destinations and time information) and
their relationships, in which we introduce the concept of private relationship
for complexity reduction. Then a modified knowledge graph embedding algorithm
is implemented to optimize the overall graph representation. Based on the trip
knowledge graph embedding model (TKGEM), the possible ranking of individuals'
unobserved destinations to be chosen in the future can be obtained by
calculating triples' distance. Empirically. PDPFKG is tested using an anonymous
vehicular dataset from 138 intersections equipped with video-based vehicle
detection systems in Xuancheng city, China. The results show that (i) the
proposed method significantly outperforms baseline methods, and (ii) the
results show strong consistency with traveler behavior in choosing potential
destinations. Finally, we provide a comprehensive discussion of the innovative
points of the methodology
Airworthiness Compliance Verification Method Based on Simulation of Complex System
AbstractA study is conducted on a new airworthiness compliance verification method based on pilot-aircraft-environment complex system simulation. Verification scenarios are established by “block diagram” method based on airworthiness criteria. A pilot-aircraft-environment complex model is set up and a virtual flight testing method based on connection of MATLAB/Simulink and Flightgear is proposed. Special researches are conducted on the modeling of pilot manipulation stochastic parameters and manipulation in critical situation. Unfavorable flight factors of certain scenario are analyzed, and reliability modeling of important system is researched. A distribution function of small probability event and the theory on risk probability measurement are studied. Nonlinear function is used to depict the relationship between the cumulative probability and the extremum of the critical parameter. A synthetic evaluation model is set up, modified genetic algorithm (MGA) is applied to ascertaining the distribution parameter in the model, and a more reasonable result is obtained. A clause about vehicle control functions (VCFs) verification in MIL-HDBK-516B is selected as an example to validate the practicability of the method
Anisotropic vortex quantum droplets in dipolar Bose-Einstein condensates
Creation of stable intrinsically anisotropic self-bound states with embedded
vorticity is a challenging issue. Previously, no such states in Bose-Einstein
condensates (BECs) or other physical settings were known. Dipolar BEC suggests
a unique possibility to predict stable anisotropic vortex quantum droplets
(AVQDs). We demonstrate that they can be created with the vortex' axis oriented
\emph{perpendicular} to the polarization of dipoles. The stability area and
characteristics of the AVQDs in the parameter space are revealed by means of
analytical and numerical methods. Further, the rotation of the polarizing
magnetic field is considered, and the largest angular velocities, up to which
spinning AVQDs can follow the rotation in clockwise and anti-clockwise
directions, are found. Collisions between moving AVQDs are studied too,
demonstrating formation of bound states with a vortex-antivortex-vortex
structure. A stability domain for such stationary bound states is identified.
Unstable dipolar states, that can be readily implemented by means of phase
imprinting, quickly transform into robust AVQDs, which suggests a
straightforward possibility for the creation of these states in the experiment.Comment: 6 pages, 6 figures, and 48 reference
Strongly anisotropic vortices in dipolar quantum droplets
We construct strongly anisotropic quantum droplets with embedded vorticity in
the 3D space, with mutually perpendicular vortex axis and polarization of the
atomic magnetic moments. Stability of these anisotropic vortex quantum droplets
(AVQDs) is verified by means of systematic simulations. Their stability area is
identified in the parametric plane of the total atom number and scattering
length of contact interactions. The application of torque perpendicular to the
vorticity axis gives rise to robust intrinsic oscillations or rotation of the
AVQDs. Collisions between slowly and fast moving AVQDs give rise, respectively,
to the elastic outcome or merger. Finally, we construct stable
vortex-antivortex-vortex bound states and find their stability regions in the
parameter space.Comment: 6 pages, 6 figures, and 66 Reference
Aromatic Amino Acid Mutagenesis at the Substrate Binding Pocket of Yarrowia lipolytica
The lipase2 from Yarrowia lipolytica (YLLip2) is a yeast lipase exhibiting high homologous to filamentous fungal lipase family. Though its crystal structure has been resolved, its structure-function relationship has rarely been reported. By contrast, there are two amino acid residues (V94 and I100) with significant difference in the substrate binding pocket of YLLip2; they were subjected to site-directed mutagenesis (SDM) to introduce aromatic amino acid mutations. Two mutants (V94W and I100F) were created. The enzymatic properties of the mutant lipases were detected and compared with the wild-type. The activities of mutant enzymes dropped to some extent towards p-nitrophenyl palmitate (pNPC16) and their optimum temperature was 35°C, which was 5°C lower than that of the wild-type. However, the thermostability of I100F increased 22.44% after incubation for 1 h at 40°C and its optimum substrate shifted from p-nitrophenyl laurate (pNPC12) to p-nitrophenyl caprate (pNPC10). The above results demonstrated that the two substituted amino acid residuals have close relationship with such enzymatic properties as thermostability and substrate selectivity
Nitrogen Fertilizer Deep Placement for Increased Grain Yield and Nitrogen Recovery Efficiency in Rice Grown in Subtropical China
Field plot experiments were conducted over 3 years (from April 2014 to November 2016) in a double-rice (Oryza sativa L.) cropping system in subtropical China to evaluate the effects of N fertilizer placement on grain yield and N recovery efficiency (NRE). Different N application methods included: no N application (CK); N broadcast application (NBP); N and NPK deep placement (NDP and NPKDP, respectively). Results showed that grain yield and apparent NRE significantly increased for NDP and NPKDP as compared to NBP. The main reason was that N deep placement (NDP) increased the number of productive panicle per m-2. To further evaluate the increase, a pot experiment was conducted to understand the N supply in different soil layers in NDP during the whole rice growing stage and a 15N tracing technique was used in a field experiment to investigate the fate of urea-15N in the rice–soil system during rice growth and at maturity. The pot experiment indicated that NDP could maintain a higher N supply in deep soil layers than N broadcast for 52 days during rice growth. The 15N tracing study showed that NDP could maintain much higher fertilizer N in the 5–20 cm soil layer during rice growth and could induce plant to absorb more N from fertilizer and soil than NBP, which led to higher NRE. One important finding was that NDP and NPKDP significantly increased fertilizer NRE but did not lead to N declined in soil compared to NBP. Compared to NPK, NPKDP induced rice plants to absorb more fertilizer N rather than soil N
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