Summary This paper firstly analyzed the uncertainty of AVOZ inversion based on two-term Rüger equation. Then, based on three-term Rüger equation, through subtraction method among different azimuths, a new non-linear equation is derived, which includes the third term of Rüger equation and Thomsen parameters. Subsequently, the new equation is solved by non-linear method-particle swarm optimization (PSO) method, by which fracture density, Thomsen parameters and can be simultaneously obtained. Then, the fracture fluid indicator is expressed in another form by using fracture density and Thomsen parameters. The numerical model application shows that the inverted fracture density from PSO method is much closer to the theoretical value than that from AVOZ inversion and the inverted anisotropic parameters are also approximate to the theoretical value, which indicate the PSO method is reliable to solve the proposed non-linear equation; meanwhile, fracture fluid indicator on the basis of non-linear inverted results can successfully identify different fluid types.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
This paper discusses running mechanism of the virtual machining simulation software,and from the simulation results classified,it introduces three-dimensional dynamic simulation characteristic of the various types,function and range of application,and uses examples to illustrate.Then points out Current status of the NC machining simulation software technology and it’s future development direction.
Understanding the conformation effect on force-induced melting is important for developing advanced semicrystalline polymer materials. Here, two types of polymer single crystals, polycaprolactone (zigzag conformation) and poly(l-lactic acid) (helical conformation), have been selected to study the conformation effect on force-induced melting by using the atomic force microscopy (AFM)-based single-molecule force spectroscopy (SMFS). We find that the zigzag chains facilitate the stick–slip motion, and the single helical chain takes smooth motion during force-induced melting from the single crystals. Furthermore, we illustrate that the conformation acts on the force-induced melting by defining the interaction in between the adjacent stems. This SMFS study deepens our understanding on the relationship between the chain conformation and nanomechanical properties of polymer crystals.
A family of five host-guest assemblies comprising different metal ions inside a cuboid 12-palladium-oxo cage, [MO8Pd12L8]n- (MPd12L8, M = ScIII, CoII, CuII, L = AsO43-; M = CdII, HgII, L = PhAsO32-), was synthesized and structurally characterized in the solid state by single-crystal X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis, and their solution and gas-phase stability were validated by multinuclear NMR spectroscopy and electrospray-ionization mass spectrometry (ESI-MS). The polyoxopalladates (POPs) ScPd12As8, CoPd12As8, and CuPd12As8 represent the first three examples of the MPd12As8 archetype. The unique cubic ligand field of {MO8} allows for collecting the speciation profiles of the POPs in solution using 45Sc and 113Cd NMR techniques. Detailed magnetic and electron paramagnetic resonance (EPR) studies were performed on CuPd12As8. Catalytic studies on MPd12As8 (M = CuII and CoII) supported on SBA-15 unveiled a guest metal-dependent structure-function relationship, with CuPd12As8 being the more efficient precatalyst for the hydroconversion of o-xylene in a fixed-bed reactor.
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