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Pore-scale lattice Boltzmann simulation of flow and mass transfer in bioreactor with an immobilized granule for biohydrogen production

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Science Bulletin 2017年第1期62卷 22-30页

作者： Qiang Liao yan-Xia yang xun Zhu Rong Chen Qian Fu Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Ministry of Education Chongqing 400030 China Institute of Engineering Thermophysics Chongqing University Chongqing 400030 China

The photo bioreaction combined with flow and mass transfer is simulated with pore-scale lattice Boltzmann （LB） method, which is the scenario of a bioreactor filled with a porous granule immobilized photosynthetic bacteria cells for hydrogen production. The quartet structure generation set （QSGS） is used to generate porous structure of the immobilized granule. The effects of porosity of the immobilized granule on flow and concentration fields as well as the hydrogen production performance are investi- gated. Higher porosity facilitates the substrate solution smoothly flowing through the porous granule with increasing velocity, and thus results in higher product concentration inside the immobilized gran- ule. Additionally, the substrate consumption efficiency increases, while hydrogen yield slightly decreases with increasing porosity, and they tend to stable for the porosity larger than 0.5. Furthermore, the LB numerical results have a good agreement with the experimental results. It is demonstrated that the pore-scale LB simulation method coupling with QSGS is available to simulate the photo hydrogen produc- tion in the hioreactor with porous immobilized granules.

关键词： Lattice Boltzmann method Pore scale Immobilized granule Photo biohydrogen production

A Layer-Structured Metal-Organic Framework-Derived Mesoporous Carbon for Efficient Oxygen Reduction Reaction

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Chinese Journal of Chemical Physics 2016年第6期29卷 693-698,I0001页

作者： Hong-guang Song yan-iun Ding Jia yang Hang-xun Xu CA5KeyLaboratoryofSoftMatterChemistry DepartmentofPolymerScienceandEngineeringUniversityofScienceandTechnologyofChinaHefei230026China

Developing highly active and durable electrocatalysts for the oxygen reduction reaction （ORR） is crucial to large-scale commercialization of fuel cells and metal-air batteries. Here we report a facile approach for the synthesis of nitrogen and oxygen dual-doped meso-porous layer-structured carbon electrocatalyst embedded with graphitic carbon coated cobalt nanoparticles by direct pyrolysis of a layer-structured metal-organic framework. The elec- trocatalyst prepared at 800℃ exhibits comparable ORR performance to Pt/C catalysts but possesses superior stability to Pt/C catalysts. This synthetic approach provides new prospects in developing sustainable carbon-based electrocatalysts for electrochemical energy conversion devices.

关键词： Electrocatalysis Oxygen reduction reaction Mesoporous carbon Cobaltnanoparticles

Direct numerical simulation of compressible turbulent flows

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Acta Mechanica Sinica 2010年第6期26卷 795-806页

作者： Xin-Liang Li De-xun Fu yan-Wen Ma Xian Liang LHD Institute of MechanicsChinese Academy of Sciences 100190 BeijingChina LNM Institute of MechanicsChinese Academy of Sciences 100190 BeijingChina

This paper reviews the authors＇ recent studies on compressible turbulence by using direct numerical simulation （DNS）,including DNS of isotropic（decaying） turbulence, turbulent mixing-layer,turbulent boundary-layer and shock/boundary-layer *** statistics, compressibility effects,turbulent kinetic energy budget and coherent structures are studied based on the DNS *** mechanism of sound source in turbulent flows is also analyzed. It shows that DNS is a powerful tool for the mechanistic study of compressible turbulence.

关键词： Direct numerical simulation Compressible turbulence Coherent structures Turbulent boundary-layer flow

Crystalline-magnetism action in biomimetic mineralization of calcium carbonate

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Chinese Journal of Chemical Engineering 2023年第7期59卷 146-152页

作者： Chaoqun Wu xun Liu Fujun Yao Xin yang yan Wang Wenyuan Hu State Key Laboratory of Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang 621000China Materials Science and Engineering Southwest University of Science and TechnologyMianyang 621000China National Health Commission Key Laboratory of Nuclear Technology Medical Transformation Mianyang Central HospitalMianyang 621010China

The influence of minor environmental factors,such as the geomagnetic field,on the biomineralization of nacres,is often ignored but a great deal of research has confirmed its important role in the normal mineralization of calcium *** the geomagnetic field is weak,its cumulative effects need to be considered given that the biomineralization process can take ***,the authors of this paper have investigated the effects of weak magnetic fields(25 Gs or 50 Gs)on calcium carbonate mineralization and analyzed the mechanism *** results show that even a weak magnetic field conduces to the formation of vaterite or aragonite,in the induction order of precursor→vaterite→*** stronger the magnetic field and the longer the time,the more obvious the induction *** effect of a magnetic field is strongest in the aging stage and weakest in the solution *** by egg-white protein and by a magnetic field inhibit each other,but they both restrict particle *** findings highlight the importance of minor environmental factors for biomineralization and can serve as a reference for biomimetic preparation of a CaCO_(3)nacre-like structure and for anti-scale technology for circulating cooling water.

关键词： Biomimetic mineralization Calcium carbonate Magnetic field Egg-white protein

Flow Analysis of Tandem Blades as the Outlet Vane of a Highly Loaded Compressor

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Journal of Thermal Science 2024年第6期33卷 2005-2018页

作者： LUO Qiao LUO Lei DU Wei yan Han WANG Songtao ZHOU xun School of Energy Science and Engineering Harbin Institute of TechnologyHeilongjiang 150001China

A tandem blade configuration is a significant flow control method that delays the onset of flow *** study numerically investigates the effects of diffusion factor and percentage pitch on the flow structure of tandem *** factors vary from 0.328 to *** pitches change from 0.80 to *** show that the loss coefficient increases with diffusion factor and decreases with percentage *** is a hub-corner stall of the forward blade in all *** flow determines the rear blade corner *** the percentage pitch and diffusion factor changes the momentum distribution of the gap *** separation of the rear blade is inhibited as low-momentum gap fluids are involved in the passage vortex along with the hub-corner stall of the forward *** diffusion factor causes a change in incidence at the leading edge of the rear blade,resulting in a variation at the corner separation of the rear blade.A tandem blade is compared with the reference outlet *** performance of the tandem blade is superior to that of the reference outlet vane in all incidences,with a 26.35%reduction in the loss coefficient and a 7.89%enhancement in the pressurization at the designed *** blades stall at positive incidence because of the hub-corner stall of the forward *** intensity of the gap flow increases with incidence,preventing corner separation of the rear blade at positive incidences.

关键词： compressor tandem blade loss corner separation gap flow

Engineered Cancer Nanovaccines:A New Frontier in Cancer Therapy

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Nano-Micro Letters 2025年第2期17卷 134-168页

作者： Yijie Wang Congrui Liu Chao Fang Qiuxia Peng Wen Qin Xuebing yan Kun Zhang Central Laboratory and Department of Medical Ultrasound Sichuan Academy of Medical SciencesSichuan Provincial People’s HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaNo.32West Second SectionFirst Ring RoadChengdu 610072People’s Republic of China Department of Stomatology and Central Laboratory School of MedicineShanghai Tenth People’s HospitalTongji UniversityNO.301 Yan‑Chang‑Zhong RoadShanghai 200072People’s Republic of China Jiangsu Provincial Innovation and Practice Base for Postdoctors Suining People’s HospitalAffiliated Hospital of Xuzhou Medical UniversityNo.2Bayi West RoadSuiningXu Zhou 221000Jiangsu ProvincePeople’s Republic of China

Vaccinations are essential for preventing and treating disease,especially cancer nanovaccines,which have gained considerable interest recently for their strong anti-tumor immune *** can prompt the immune system to generate antibodies and activate various immune cells,leading to a response against tumor tissues and reducing the negative effects and recurrence risks of traditional chemotherapy and *** enhance the flexibility and targeting of vaccines,nanovaccines utilize nanotechnology to encapsulate or carry antigens at the nanoscale level,enabling more controlled and precise drug delivery to enhance immune *** nanovaccines function by encapsulating tumor-specific antigens or tumor-associated antigens within *** small size of these nanomaterials allows for precise targeting of T cells,dendritic cells,or cancer cells,thereby eliciting a more potent anti-tumor *** this paper,we focus on the classification of carriers for cancer nanovaccines,the roles of different target cells,and clinically tested cancer nanovaccines,discussing strategies for effectively inducing cytotoxic T lymphocytes responses and optimizing antigen presentation,while also looking ahead to the translational challenges of moving from animal experiments to clinical trials.

关键词： Cancer nanovaccines Immunotherapy Nanobiotechnology Immune targets Signaling pathway

A Solvable Decorated Ising Lattice Model

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Communications in Theoretical Physics 2006年第3期45卷 555-557页

作者： SUN Chun-Feng KONG Xiang-Mu YIN xun-chang Department of Physics Xiaogan University Xiaogan 432100 China Department of Physics Qufu Normal University Qufu 273165 China Interdisciplinary Center of Theoretical Studies the Chinese Academy of Sciences Beijing 100080 China

A decorated lattice is suggested and the Ising model on it with three kinds of interactions K1, K2, and K3 is studied. Using an equivalent transformation, the square decorated Ising lattice is transformed into a regular square Ising lattice with nearest-neighbor, next-nearest-nelghbor, and four-spin interactions, and the critical fixed point is found at K1 = 0.5769, K2= -0.0671, and K3 = 0.3428, which determines the critical temperature of the system. It is also found that this system and the regular square Ising lattice, and the eight-vertex model belong to the same universality class.

关键词： Ising model square decorated lattice critical point universality class

Efficient fine-grained shared buffer management for multiple OpenCL devices

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第11期14卷 859-872页

作者： chang-qing xun Dong CHEN Qiang LAN Chun-yuan ZHANG College of Computer National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology

OpenCL programming provides full code portability between different hardware platforms,and can serve as a good programming candidate for heterogeneous systems,which typically consist of a host processor and several ***,to make full use of the computing capacity of such a system,programmers are requested to manage diverse OpenCL-enabled devices explicitly,including distributing the workload between different devices and managing data transfer between multiple *** these tedious jobs pose a huge challenge for *** this paper,a distributed shared OpenCL memory(DSOM) is presented,which relieves users of having to manage data transfer explicitly,by supporting shared buffers across *** allocates shared buffers in the system memory and treats the on-device memory as a software managed virtual cache *** support fine-grained shared buffer management,we designed a kernel parser in DSOM for buffer access range analysis.A basic modified,shared,invalid cache coherency is implemented for DSOM to maintain coherency for cache *** addition,we propose a novel strategy to minimize communication cost between devices by launching each necessary data transfer as early as *** strategy enables overlap of data transfer with kernel *** experimental results show that the applicability of our method for buffer access range analysis is good,and the efficiency of DSOM is high.

关键词： Shared buffer OpenCL Heterogeneous programming Fine grained

Low Root Zone Temperature Limits Nutrient Effects on Cucumber Seedling Growth and Induces Adversity Physiological Response

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Journal of Integrative Agriculture 2013年第8期12卷 1450-1460页

作者： yan Qiu-yan DUAN Zeng-qiang MAO Jing-dong LI xun DONG Fei State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences Department of Chemistry and Biochemistry Old Dominion University Agricultural Bureau of Xiangfen County Shanxi Province

Effects of root-zone temperatures （RZT）（12℃-RZT and 20℃-RZT） and different N, P, and K nutrient regimes on the growth, reactive oxygen species （ROS）, and antioxidant enzyme in cucumber seedlings were investigated in hydroponics. Strong interactions were observed between RZT and nutrient on the dry weight （P=0.001）, root length （P=0.001） and leaf area （P=0.05）. Plant dry weights were suppressed at low RZT of 12℃, while higher biomass and growth of cucumber seedlings were produced at elevated RZT of 20℃ under each nutrient treatment. Growth indexes （plant height, internode length, root length, and leaf area） at 12℃-RZT had less difference among nutrient treatments, but greater response was obtained for different nutrients at high RZT. RZT had larger effects （P=0.001） on cucumber seedling growth than nutrients. In addition, N was more effective nutrients to plant growth than P and K under low root temperature to plant growth. Higher hydrogen peroxide （H202）, malondialdehyde （MDA）, soluble sugar （SS） contents in leaves were observed at 12℃-RZT in all nutrient treatments than those at 20℃-RZT, indicating the chilling adversity damaged to plant growth. In general, antioxidant enzyme had larger response under low root-zone temperature. Superoxide dismutase （SOD） activities were higher in both leaves and roots while peroxidase （POD） and catalase （CAT） showed large different action in leaves and roots at both the two root-zone temperature.

关键词： Cucumis sativus L. growth indexes antioxidant enzyme reactive oxygen