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An analytical model for water-oil two-phase flow in inorganic nanopores in shale oil reservoirs

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Petroleum Science 2021年第6期18卷 1776-1787页

作者： Ran Li Zhangxin Chen Keliu Wu xing hao Jinze Xu Department of Chemical and Petroleum Engineering University of CalgaryCalgaryAlbertaT2N 1N4Canada State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Illinois Institute of Technology ChicagoIL60616United States

The existence of water phase occupies oil flow area and impacts the confined oil flow behavior at the solid substrate in inorganic nanopores of shale oil reservoirs,resulting in a completely different flow pattern when compared with the single oil phase *** study proposes an analytical model to describe the water-oil two-phase *** this model,water slippage at the solid substrate is considered while oil slip is introduced to calculate the oil movement at the solid-oil boundary in dry *** is proven that the oil flow profiles of both the two-phase model and single-phase model show parabolic shapes,but the oil flow capacity drops when water takes up the flow space and the impact of water is more significant when the pore dimension is smaller than 30 ***,the oil flow velocity at a pore center is found to drop linearly given a larger water saturation in wet *** effects of surface wettability and oil properties on water-oil flow are also *** with the existing singlephase models,this model describes oil flow pattern in the wet condition with the incorporation of the influence of nanopore properties,which better predicts the oil transport in actual reservoir ***-oil relative permeability curves are also obtained to improve oil yield.

关键词： Shale oil Water films Two-phase flow Nanopore

Effects of Sb and heat treatment on the microstructure of Al-15.5wt%Mg_2Si alloy

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International Journal of Minerals,Metallurgy and Materials 2013年第7期20卷 653-658页

作者： Yu-hua Zhao Xiu-bin Wang xing-hao Du Chao Wang School of Materials Science and Engineering Shenyang Aerospace University

The modification effects of alloying element Sb and heat treatment on Al-15.5wt%Mg2Si alloy were investigated by Olympus microscopy （OM）, scanning electron microscopy and energy disperse spectroscopy （SEM-EDS）, and X-ray diffraction （XRD）. It is found that Sb plays a significant role in shaping primary Mg2Si phase and eutectic Mg2Si phase in Al-15.5wt%MgzSi alloy. The Sb addition of about 1.0wt% makes the resultant alloy show the finest primary Mg2Si phase and the eutectic Mg2Si phase with well distribution. But further increasing the Sb content decreases the amount of primary Mg2Si phase, and some segregated phases appear at regions between the grains. In addition, heat treatment can modify the microstructural feature of Sb-modified Al-15.5wt%Mg2Si alloy in terms of obviously shortening the nodulizing time of primary Mg2Si phase and eutectic Mg2Si phase.

关键词： aluminum alloys intermetallics heat treatment antimony microstructure modification

Solar thermal swing adsorption on porous carbon monoliths for high-performance CO_(2)capture

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Nano Research 2023年第7期16卷 10617-10625页

作者： Zheng Wu xing-hao Du Qian-Feng Zhang Maria Strømme Chao Xu Institute of Molecular Engineering and Applied Chemistry Anhui University of TechnologyMa’anshan 243002China Division of Nanotechnology and Functional Materials Department of Materials Science and EngineeringÅngström LaboratoryUppsala UniversityUppsala SE-75121Sweden

Utilizing solar energy for sorbent regeneration during the CO_(2)swing adsorption process could potentially reduce CO_(2)capture *** study describes a new technique—solar thermal swing adsorption(STSA)for CO_(2)capture based on application of intermittent illumination onto porous carbon monolith(PCM)sorbents during the CO_(2)capture *** allows CO_(2)to be selectively adsorbed on the sorbents during the light-off periods and thereafter released during the light-on periods due to the solar thermal *** freestanding and mechanically strong PCMs have rich ultramicropores with narrow pore size distributions,displaying relatively high CO_(2)adsorption capacity and high CO_(2)/N_(2) *** the high CO_(2)capture performance,high solar thermal conversion efficiency,and high thermal conductivity,the PCM sorbents could achieve high CO_(2)capture rate of up to 0.226 kg·kgcarbon^(-1)·h^(-1)from a gas mixture of 20 vol.%CO_(2)/80 vol.%N_(2) under STSA conditions with a light intensity of 1000 W·m^(-2).In addition,the combination of STSA with the conventional vacuum swing adsorption technique further increases the CO_(2)working capacity.

关键词： microporous materials adsorption porous carbon monoliths solar thermal swing adsorption CO_(2)capture

Enhanced compression ductility of stoichiometric NiAl at room temperature by Y and Cu co-addition

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 348-353页

作者： xing-hao Du Chong Gao Bao-lin Wu Yu-hua Zhao Ji-jie Wang School of Materials Science and Engineering Shenyang Aerospace University Shenyang 110136 China

The combined effects of （Y, Cu） on the microstructttre and room-temperature mechanical properties of the NiA1 intermetallic com- pound under uniaxial compression stress were investigated. It is found that the co-addition of Y and Cu enlarges the difference between the inter- granular yield strength and the intragranular yield strength of NiA1 grains. Hence, for the resultant NiAI-（Y,Cu） alloy, a mechanically hierar- chical structure forms. This is beneficial to improve the room-temperature mechanical response of NiA1 alloys; as a result, the resultant alloy with 0.56at% （Y, Cu） exhibits a remarkably enhanced compression plasticity of about 11.2%.

关键词： intermetallics microalloying microstructure plasticity

Synthesis and properties of polyfluorene copolymers bearing thiophene and porphyrin

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Chinese Chemical Letters 2007年第7期18卷 879-882页

作者： xing Xu hao Chen Xian Rong Cai Ying Li Qing Jiang College of Chemistry Sichuan University Chengdu 610064 China

To search for more wider absorption and higher charge carriers mobilities materials of polymer solar cell, a series of soluble alternating polyfluorene copolymers were synthesized by palladium-catalyzed Suzuki coupling reaction. Their structures were determined by 1H NMR, IR and UV-vis. And their UV-vis absorption spectra indicated that they had strong absorption over 600 nm spectral range and nearly cover 400-700 nm visible region. The band gaps of copolymers calculated according to cyclic voltammetry （CV） were between 1.96 and 2.03 eV. Polymer：TiO2 bulk-heterojunction films were made from mixtures of polymer and titanium isopropoxide, a precursor for TiO2, via hydrolysis in air overnight. The photoluminescence at 380-800 nm of the blend film of PT-TPP20 （5 mg/mL）：Ti（OC3H7）4 （80 μL/mL）（20% volume fraction） was significantly quenched in the 50% Ti（OC3H7）4 blend film, indicating that rapid and efficient separation of photoinduced electron-hole pairs.

关键词： Polyfluorene copolymers Synthesis Absorption Bulk-heterojunction

Controlling Three-Dimensional Electron-Electron Correlation via Elliptically Polarized Intense Laser Field

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Chinese Physics Letters 2017年第4期34卷 30-34页

作者： Jian-xing hao Xiao-Lei hao Wei-Dong Li Shi-Lin Hu Jing Chen Institute of Theoretical Physics and Department of Physics Shanxi University Taiyuan 030006 HEDPS Center for Applied Physics and Technology Peking University Beijing 100871 Institute of Applied Physics and Computational Mathematics Beijing 100088

The three-dimensional electron-electron correlation in an elliptically polarized laser field is investigated based on a semiclassical model. Asymmetry parameter α of the correlated electron momentum distribution is used to quantitatively describe the electron-electron correlation. The dependence of α on elliptieity e is totally different in three directions. For the z direction （maJor polarization direction）, α first increases and reaches a maximum at ε = 0.275, then it decreases quickly. For the y direction in which the laser field is always absent, the ellipticity has a minor effect, and the asymmetry parameter fluctuates around α = -0.15. However, for the x direction （minor polarization direction）, α increases monotonously with ellipticity though starts from the same value as in the y direction when ε = 0. The behavior of α in the x direction actually indicates a transformation from the Coulomb interaction dominated correlation to the laser field dominated correlation. Therefore, our work provides an efficient way to control the three-dimensional electron electron correlation via an elliptically polarized intense laser field.

关键词： Controlling Three-Dimensional Electron-Electron Correlation via Elliptically Polarized Intense Laser Field RII

Two-Stream Temporal Convolutional Networks for Skeleton-Based Human Action Recognition

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Journal of Computer Science & Technology 2020年第3期35卷 538-550页

作者： Jin-Gong Jia Yuan-Feng Zhou xing-Wei hao Feng Li Christian Desrosiers Cai-Ming Zhang School of Software Shandong UniversityJinan 250101China Department of Software and IT Engineering University of QuebecMontreal H3C 3P8Canada

With the growing popularity of somatosensory interaction devices,human action recognition is becoming attractive in many application ***-based action recognition is effective because the skeleton can represent the position and the structure of key points of the human *** this paper,we leverage spatiotemporal vectors between skeleton sequences as input feature representation of the network,which is more sensitive to changes of the human skeleton compared with representations based on distance and angle *** addition,we redesign residual blocks that have different strides in the depth of the network to improve the processing ability of the temporal convolutional networks(TCNs)for long time dependent *** this work,we propose the two-stream temporal convolutional networks(TSTCNs)that take full advantage of the inter-frame vector feature and the intra-frame vector feature of skeleton sequences in the spatiotemporal *** framework can integrate different feature representations of skeleton sequences so that the two feature representations can make up for each other’s *** fusion loss function is used to supervise the training parameters of the two branch *** on public datasets show that our network achieves superior performance and attains an improvement of 1.2%over the recent GCN-based(BGC-LSTM)method on the NTU RGB+D dataset.

关键词： skeleton action recognition temporal convolutional network(TCN) vector feature representation neural network

Asymmetric Synthesis of Chiral 1,3-Disubstituted Allylsilanes via Copper(I)-Catalyzed 1,4-Conjugate Silylation ofα,β-Unsaturated Sulfones and Subsequent Julia-Kocienski Olefination

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Chinese Journal of Chemistry 2021年第7期39卷 1916-1922页

作者： Xian-Liang Wang xing-hao Yin Jun-Zhao Xiao Xue-Shun Jia Liang Yin CAS Key Laboratory of Synthetic Chemistry of Natural Substances Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences345 Lingling RoadShanghai200032 China Department of Chemistry Shanghai University99 Shangda RoadShanghai200444 China

Main observation and conclusion A general synthesis of chiral 1,3-disubstituted allylsilanes is established through copper(I)-catalyzed asymmetric 1,4-conjugate silylation ofα,β-unsaturated sulfones and subsequent Julia-Kocienski *** modification of McQuade's NHC ligand,the catalytic asymmetric conjugate silylation with a broad substrate scope is achieved in high enantioselectivity.

关键词： Chiral allylsilanes Silylation Olefination Allylation Asymmetric catalysis

The Influence of Sea Sprays on Drag Coefficient at High Wind Speed

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Journal of Ocean University of China 2023年第1期22卷 21-27页

作者： SHI Hongyuan LI Qingjie WANG Zhaowei ZHANG Xuri LI Huaqing xing hao ZHANG Kuncheng Centre for Ports and Coastal Disaster Mitigation Ludong UniversityYantai 264025China The Center for Ports and Maritime Safety(CPMS) Dalian Maritime UniversityDalian 1160263China Marine Environmental Monitoring Central Station State Oceanic AdministrationYantai 264025China Guangxi Key Laboratory of Marine Environmental Science Guangxi Academy of SciencesNanning 530025China

Field and laboratory observations indicate that the variation of drag coefficient with wind speed at high winds is different from that under low-to-moderate *** taking the effects of wave development and sea spray into account,a new parameterization of drag coefficient applicable from low to extreme winds is *** is shown that,under low-to-moderate wind conditions so that the sea spray effects could be neglected,the nondimensional aerodynamic roughness first increases and then decreases with the increasing wave age;whereas under high wind conditions,the drag coefficient decreases with the increasing wind speed due to the modification of the logarithmic wind profile by the effect of sea spray droplets produced by bursting bubbles or wind tearing breaking wave *** drag coefficients and sea surface aerodynamic roughnesses reach their maximum values vary under different wave ***,the reduction of drag coefficient under high winds reduces the increasing rate of friction velocity with increasing wind speed.

关键词： sea spray wave age drag coefficient high wind speed