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Microchannel reactors for Fischer-Tropsch synthesis:Experimental investigation and mathematical modeling

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Chinese Journal of Chemical Engineering 2023年第12期64卷 224-240页

作者： Huili Cao Run Xu Xiaojin Tang Tao Yang Shuandi hou Chaopeng hou SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China

The Fischer-Tropsch synthesis is a significant technology for converting coal,natural gas,and biomass into synthetic *** recent years,the use of microchannel reactors for the Fischer-Tropsch synthesis has attracted significant ***-Tropsch synthesis experiments were carried out in a microchannel reactor and the influences of reaction conditions on the experimental results were investigated in this *** on the experimental data,a dynamic multi-component pseudo-homogeneous variable-volume flow model of microchannel reactors for the Fischer-Tropsch synthesis was built to determine the pressure-,velocity-,conversion-and(component-wise)concentration-distributions in reaction *** model takes into account the combined effects of gas volume expansion caused by the frictional pressure drop and gas volume contraction caused by reaction consumption.A novel effective method for calculating the pressure and superficial gas velocity values in microchannel reactors was proposed in the *** that,two sets of experimental data were selected from references to evaluate the validity and accuracy of the *** reaction performances in the microchannels were analyzed carefully based on the calculated results.

关键词： Fischer-Tropsch synthesis Microchannel reactors Modeling Variable-volume flow

Peierls-phase-induced topological semimetals in an optical lattice:Moving of Dirac points,anisotropy of Dirac cones,and hidden symmetry protection

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Chinese Physics B 2020年第12期29卷 82-87页

作者： Jing-Min hou School of Physics Southeast UniversityNanjing 211189China

We propose a square optical lattice in which some of neighbor hoppings have a Peierls *** Peierls phase makes the lattice have a special band structure and induces the existence of Dirac points in the Brillouin zone,which means that topological semimetals exist in the *** Dirac points move with the change of the Peierls phase and the Dirac cones are anisotropic for some vales of the Peierls *** lattice has a novel hidden symmetry,which is a composite antiunitary symmetry composed of a translation operation,a sublattice exchange,a complex conjugation,and a local U(1)gauge *** prove that the Dirac points are protected by the hidden symmetry and perfectly explain the moving of Dirac points with the change of the Peierls phase based on the hidden symmetry protection.

关键词： topological semimetal optical lattice hidden symmetry

Asymptotic Behavior of Solutions of a Free Boundary Problem Modeling Multi-layer Tumor Growth in Presence of Inhibitor

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Acta Mathematica Sinica,English Series 2011年第8期27卷 1621-1636页

作者： Xiu Mei hou Wuhan Bioengineering Institute Wuhan 430415 P. R. China Department of Mathematics Sun Yat-Sen University Guangzhou 510275 P. R. China

In this paper we study well-posedness and asymptotic behavior of solution of a free boundary problem modeling the growth of multi-layer tumors under the action of an external inhibitor. We first prove that this problem is locally well-posed i[n little H61der spaces. Next we investigate asymptotic behavior of the solution. By computing the spectrum of the linearized problem and using the linearized stability theorem, we give the rigorous analysis of stability and instability of all stationary fiat solutions under the non-fiat perturbations. The method used in proving these results is first to reduce the free boundary problem to a differential equation in a Banach space, and next use the abstract well-posedness and geometric theory for parabolic differential equations in Banach spaces to make the analysis.

关键词： Free boundary problem multi-layer tumor inhibitor well-posedness asymptotic behavior

Characteristics of coastline changes in China's Mainland since the early 1940s

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Science China Earth Sciences 2016年第9期59卷 1791-1802页

作者： hou XiYong WU Ting hou Wan CHEN Qing WANG YuanDong YU LiangJu Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China University of Chinese Academy of Sciences Beijing 100049 China

Based on multi-temporal topographic maps, remote sensing images and field surveys covering the entire coastal zone of China's Mainland, the coastlines of six periods since the early 1940s were extracted. Coastline changes over the last 70 years were then analyzed in terms of coastline structure, coastline fractals, coastline change rates, land-sea patterns, and bay areas. The results showed that mainland coastline structure changed dramatically, and due to the significant coastline artificialization mainly driven by sea reclamation and coastal engineering, the remaining natural coastline merely accounts for less than one third at present. Coastline fractal dimension represented an overall spatial pattern of ＂north 〈 entirety 〈 south＂; however, the discrepancy between the north and south coast was apparently narrowed due to dramatic coastline artificialization of northern China which in turn altered the whole pattern. Patterns and processes of land-sea interchange along the mainland coast were complex and varied spatially and temporally, with over 68% advancing toward sea and 22% retreating toward land. The net growth of land area was nearly 14.2 ×10^3 km2 with an average growth rate of 202.82 km2 al; and coast retreat was characterized by area decrease of 93 bays with a magnitude of 10.1 ×10^3 km2 and an average shrinking rate up to 18.19% or an average shrinking speed up to 144.20 km2 a-1, among which the total area of Bohai shrunk by 7.06%, with an average annual loss amounting to 82 km2. The dramatic coastline changes along China's Mainland have brought about kinds of challenges to the coastal environment, therefore the integrated management, effective environment protection and sustainable utilization of coastlines is urgent.

关键词： China Mainland coastline Coastline structure Coastline fractal dimension Coastline change rate Land-Sea change Bay area

Integral Operators Between Fock Spaces

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Chinese Annals of Mathematics,Series B 2024年第2期45卷 265-278页

作者： Yongqing LIU Shengzhao hou School of Mathematics and Statistics Changshu Institute of TechnologySuzhou 215006JiangsuChina School of Mathematical Sciences Soochow UniversitySuzhou 215006JiangsuChina

In this paper,the authors study the integral operator■induced by a kernel functionφ(z,·)∈F_α~∞between Fock *** 1≤p≤∞,they prove that S_φ:F_α^(1)→F_α^(p)is bounded if and only if■where k_(a)is the normali... 详细信息

关键词： Fock spaces Integral operators Normalized reproducing kernel

Nonequilibrium Dynamics of Chemically Active Particles

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Chinese Journal of Chemistry 2022年第3期40卷 419-429页

作者： Huijun Jiang Zhonghuai hou Hefei National Laboratory for Physical Sciences ot the Microscale&Technology of China HefeiAnhui 230026China

Chemically active motion is ubiquitous in many nature and artificial systems where each unit can move directionally by converting chemical energy into kinetic *** the systems are driven by activity far from equilibrium,many dynamical behaviors forbidden in equilibrium systems may be *** dynamics of such systems is then a hot multidisciplinary topic with great ***,we review our recent theoretical advances in some fundamental problems at the single active particle level,the collective behavior level,as well as in systems where active particles act as baths.

关键词： Statistical mechanics Nonequilibrium processes Kinetics Chemically active particle Multiscale modeling

Design of Copper Oxide Nanosheets-Loaded Zeolite with Efficient Inhibition of Marine Bacteria

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Journal of Ocean University of China 2022年第5期21卷 1237-1243页

作者： hou Jin YE Yongcheng Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Shandong Key Laboratory of Corrosion Science Institute of OceanologyChinese Academy of SciencesQingdao 266100China

Copper oxide-loaded zeolite 4A nanocomposites(CuO-zeolite NCs)were successfully prepared by modifying zeolite 4A with CuSO_(4)aqueous solution as the copper *** 4A showed an important role in hosting copper oxide,and CuO-zeolite NCs exhibited a controlled release of copper *** patterns confirmed the appearance of new diffraction peaks of copper oxide at 35.83°and 38.83°.CuO nanosheets formed on the surface of zeolite 4A were about 30–40 nm thick over a width of 200–300 ***-zeolite NCs were primarily composed of Cu,Si,Al and O,as measured by *** 2p_(3/2) and Cu 2p_(1/2) peaks were fitted into two main peaks centered at 934.7 eV and 954.6 eV,which were attributed to Cu(II).Zeolite 4A and CuO-zeolite NC displayed reversible Langmuir isotherm(type-I)characteristics and showed maximum adsorption quantities of almost 200 cm^(3) g^(−1) at a relative pressure of 1.0 by CO_(2)adsorption-desorption *** antibacterial efficiencies of the CuO-zeolite NC were 99.4%,96.7%,and 96.8%against Pseudoalteromonas tetraodonis(***),Micrococcus luteus(***),and Shewanella putrefaciens(***),*** values showed that nano CuO-loaded zeolite 4A acted as a strong bactericide against marine ***-zeolite NCs can be further applied to marine antifouling coating.

关键词： antibacterial activities marine bacteria copper oxide nanosheets zeolite

Discovery of the Early Paleozoic Boin Sum-Ordor Sum Island Arc in the Hadamiao Gold Ore District, Inner Mongolia and its Significance to the Evolution of the Paleo-Asian Ocean

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Acta Geologica Sinica(English Edition) 2012年第5期86卷 1251-1264页

作者： HAO Baiwu hou Zenqian Gold Geological Institute of Chinese Army Police Force LangfangHebei 065000China China University of Geosciences Beijing 100083China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

Early Paleozoic granodiorite has been identified on the northern margin of the North China craton in the east section of the central-Asian orogenic belt, which was previously known as early Indosinian in age. By using the LA-ICP-MS method, the obtained zircon U-Pb age is 445.6 2.7 Ma, which represents the crystallization age of the granodiorite. The granodiorite near the east of the large-sized Bilihe gold deposit is of the tholeiite series with low potassium. It is quasi-aluminous I-type granite, enriched in sodium （Na2 O/K2O=7.29 9.77） and magnesium （Mg # =0.51 0.67）. The ΣREE value is relatively low, obvious differentiation is shown between LREE and HREE and within LREE, and the Eu anomaly is low and negative （δEu=0.74 0.91）. In the primitive-mantle normalized spider diagrams of trace elements, the granodiorite is relatively rich in LREE and LILE （Ba, Sr, Th）, and strongly depleted in HFSE （Nb, Ta, Ti and P）, which shows features of subduction zone components （SZC）. In the discrimination diagrams of tectonic settings of granite for Rb vs. （Nb＋Y）, Rb vs. （Ya＋Ta）, La/Nb vs. Ba/Nb and Th/Nb vs. Ba/Nb, the granodiorite exhibits typical features of island arc granite. The normalized values of K and Rb are extremely low, while the values of Sr and Eu are very high, which are similar to those of island arc magma that has undergone metasomatism of fluid from the oceanic crust. The granodiorite is relatively depleted in ε Hf （t）（5.1 7.1） and low in ε Hf （t） model ages （1089 921 Ma）. In the ε Hf （t） vs. age （T） diagram, the distribution area of the granodiorite is accordant with the field of the Xing’anling-Mongolia orogenic belt, which indicates that the magmatic sources are mainly the mixture of partial melting of wedged mantle subjected to metasomatism of fluid from the oceanic crust and young substance from the crust. The granodiorite is similar to the felsic arc magma in the Damao Banner, Bate Obon, Boin Sum and Ordor Sum regions, and they altogether constitute an ea

关键词： granodiorite magmatic provenance of granodiorite zircon LA-ICP-MS U-Pb dating arc magmatic belt northern margin of the North China craton

Task allocation based on profit maximization for mobile crowdsourcing

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The Journal of China Universities of Posts and Telecommunications 2020年第1期27卷 26-37页

作者： hou Yinglin Cheng Weiqing School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory of Computer Network and Information Integration Southeast UniversityNanjing 211189China

In recent years, with the development of smart devices, mobile users can use them to sense the environment. In order to improve the data quality and achieve maximum profits, incentive mechanism is needed to motivate users to participate. In this paper, reputation mechanism, participant selection, task allocation and joint pricing in mobile crowdsourcing system are studied. A user reputation evaluation method is proposed, and a participant selection algorithm(PSA) based on user reputation is proposed. Besides, a social welfare maximization algorithm(SWMA) is proposed, which achieves task pricing with maximizing the interests of all parties, including both task publishers and mobile users. The social welfare maximization problem is divided into local optimization sub-problems which can be solved by double decomposition. It is proved that the algorithm converges to the optimal solution. Results of simulations verify that algorithms PSA and SWMA are effective.

关键词： mobile crowdsourcing maximum profits reputation mechanism task allocation