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Feasibility neutronic design for the reactor core configurations of a 5 MWth transportable block-type HTR

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Nuclear Science and Techniques 2013年第4期24卷 75-80页

作者： ding ming KLOOSTERMAN Jan Leen College of Nuclear Science and Technology Harbin Engineering University Reactor Institute Delft Delft University of Technology

Small long-life transportable high temperature gas-cooled reactors(HTRs) are interesting because they can safely provide electricity or heat in remote areas or to industrial users in developed or developing *** paper presents the neutronic design of the U-Battery,which is a 5 MWth block-type HTR with a fuel lifetime of 5–10 *** a reactor pressure vessel diameter of less than 3.7 m,some possible reactor core configurations of the 5 MWth U-Battery have been investigated using the TRITON module in SCALE *** neutronic analysis shows that Layout 12×2B,a scattering core containing 2 layers of 12 fuel blocks each with 20% enriched235U,reaches a fuel lifetime of 10 effective full power years(EFPYs).When the diameter of the reactor pressure vessel is reduced to 1.8 m,a fuel lifetime of 4 EFPYs will be achieved for the 5 MWth U-Battery with a 25-cm thick graphite side *** 6×3 and 6×4 with a 25-cm thick BeO side reflector achieve a fuel lifetime of 7 and 10 EFPYs,*** comparison of the different core configurations shows that,keeping the number of fuel blocks in the reactor core constant,the annular and scattering core configurations have longer fuel lifetimes and lower fuel cost than the cylindrical ***,for the 5 MWth U-Battery,reducing the fuel inventory in the reactor core by decreasing the diameter of fuel kernels and packing fraction of TRISO particles is more effective to lower the fuel cost than decreasing the 235U enrichment.

关键词：高温气冷反应堆堆芯中子设计反应堆压力容器 HTR 可移动燃料成本

Interaction and eruption of two filaments observed by Hinode, SOHO, and STEREO

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Research in Astronomy and Astrophysics 2012年第3期12卷 287-299页

作者： Ying Li ming-De ding School of Astronomy and Space Science Nanjing UniversityNanjing 210093China Key Laboratory for Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210093China

We investigate the interaction between two filaments and the subsequent filament eruption event observed from different viewing angles by Hinode, the Solar and Heliospheric Observatory, and the Solar Terrestrial Relations Observatory. In the event, the two filaments rose high, interacted with each other, and finally were ejected along two different paths. We measure the bulk-flow velocity using spectroscopic data. We find significant outflows at the speed of a few hundreds of km s 1 during the filament eruption, and also some downflows at a few tens of km s-1 at the edge of the eruption region in the late stage of the eruption. The erupting material was composed of plasmas with a wide temperature range of 10-4–106 K. These results shed light on the filament nature and the coronal dynamics.

关键词： line: profiles—Sun: corona—Sun: filaments—Sun: flares—Sun: UV radiation

Energy Storage Properties of Phase Change Materials Prepared from PEG/CPP

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Chinese Chemical Letters 2005年第10期16卷 1375-1378页

作者： ya Nan ZANG En Yong ding Key Laboratory of Cellulose and Lignocellulosics Chemistry Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 Graduate School of the Chinese Academy of Sciences Beijing 100039

New kinds of solid-solid phase change materials have been prepared in our laboratory. In these materials, the rigid polymer chlorinated polypropylene is taken as skeletons and the flexible polymer polyethylene glycol 6000 and polyethylene glycol 10000 are taken as functional chains. Results show that chlorinated polypropylene grafted by polyethylene glycol 10000 has greater enthalpy than chlorinated polypropylene grafted by polyethylene glycol 6000.

关键词： Polyethylene glycol chlorinated polypropylene phase change materials.

Panax notoginseng saponins prevent colitis-associated colorectal cancer via inhibition IDO1 mediated immune regulation

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Chinese Journal of Natural Medicines 2022年第4期20卷 258-269页

作者： LI Xue-ming YUAN ding-Yi LIU ya-Hui ZHU Lei QIN Hong-Kun yaNG Yu-Bing LI yan yaN Fang WANG ya-Jing Department of physiology School of Basic Medicine and Clinical PharmacyChina Pharmaceutical UniversityNanjing 210009China Department of Pharmaceutical Analysis School of pharmacologyChina Pharmaceutical UniversityNanjing 210009China Department of Chronic Communicable Disease Jiangsu Provincial Center for Disease Prevention and ControlNanjing 210009China

Colorectal cancer(CRC)is the third most lethal cancer and leading cause of cancer mortality worldwide.A key driver of CRC development is colon inflammatory responses especially in patients with inflammatory bowl disease(IBD).It has been proved that Panax notoginseng saponins(PNS)have anti-inflammatory,anti-oxidant and anti-tumor *** chemopreventive and immunomodulatory functions of PNS on colitis-associated colorectal cancer(CAC)have not been *** present study was designed to study the potential protective effects of PNS on AOM/DSS-induced CAC mice to explore the possible mechanism of PNS against *** study showed that PNS significantly alleviated colitis severity and prevented the occurrence of *** assays revealed that PNS relieved immunosuppression of Treg cells in the CAC microenvironment by inhibiting the expression of IDO 1 mediated directly by signal transducer and activator of transcription 1(STAT1)rather than phosphorylated ***,Rhl,one of the PNS metabolites,exhibited the best inhibitory effect on IDO1 enzyme *** study showed that PNS exerted significant chemopreventive function and immunomodulatory properties on *** could reduce macrophages accumulation and Treg cells differentiation to reshape the immune microenvironment of *** findings provided a promising approach for CAC intervention.

关键词： Panax notoginseng saponins Colitis-associated colorectal cancer Chemoprevention Treg cells IDO1

A novel cell search scheme for OFDM cellular systems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第1期8卷 10-17页

作者： ding ming LUO Han-wen WU Yun Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

A novel cell search scheme for OFDM cellular systems is proposed. It is based on one OFDM symbol with several identical slots as preamble, the time domain repetition structure of which can be utilized to accomplish OFDM timing/frequency synchronization. The cell ID is comprised of two parts: a sub-carrier mask index g and a sequence index x. Each sub-carrier mask activates or deactivates some of the sub-carriers, after which a differentially coded sequence is loaded on pairs of the adjacent active sub-carriers. The user equipment (UE) recognizes the mask with index g via power detection of the received frequency domain signal. Then it estimates the index x from differential demodulation followed by detection of the frequency domain se-quence. In order to improve the performance, a method of jointly estimating g and x is devised. Simulation results showed that the proposed scheme is able to support a very large number of cell IDs while maintaining a good performance even in bad multi-cell environment.

关键词： Orthogonal frequency division multiplexing (OFDM) Cell search Cell ID Multi-cell Mask

Kinematics of Non-axially Positioned Vesicles through a Pore

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Chinese Journal of Polymer Science 2020年第7期38卷 776-783,I0008页

作者： Yun-Long Han ming-ming ding Rui Li Tong-Fei Shi School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

We employ finite element method to investigate the kinematics of non-axially positioned vesicles through a *** complete the coupling between fluid flow and the vesicle membranes,we use the fluid structure interactions with the arbitrary Lagrangian Eulerian *** results demonstrate that the vesicles show different deformations in migration process,in turn an oblique ellipse-shape,slipper-shape,*** find that the rotation angle of non-axially positioned vesicles mainly shows the trend of increase,besides the small fluctuation induced by deformation ***,when the vesicles move towards the axis of the channel,the rotation angle exhibits a decrease because of the decrease of the shear ***,rotation of axially positioned vesicles hardly occur due to symmetrical shear *** results further indicate that the rotation is faster nearby the pore for non-axially positioned *** work answers the mapping between the positions of vesicles and deformed states,as well as the change of rotation angle and rotation velocity,which can provide helpful information on the utilization of vesicles in pharmaceutical,chemical,and physiological processes.

关键词： Vesicles Narrow pore Rotation angle Rotation velocity

Conformation of an Amphiphilic Comb-like Copolymer in a Selective Solvent

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Chinese Journal of Polymer Science 2023年第9期41卷 1386-1391,I0006页

作者： Peng Hao Xing-Hong Mai Qiao-Yue Chen ming-ming ding Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics College of Physical Science and TechnologyYili Normal UniversityYining835000China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China

We study the conformation of an amphiphilic comb-like copolymer in a selective solvent by using Brownian dynamics *** results demonstrate that,there is an optimal total degree of polymerization to form spherical *** when the total degree of polymerization is less than the optimal total degree of polymerization,a unimolecular spherical micelle can be formed,otherwise,the spherical micelle will be transformed into a cylindrical *** the total degree of polymerization is less than the optimal total degree of polymerization,the radius of gyration and the stretching factor meet an exponential relationship,where the power exponent decreases with the increase of the length of hydrophilic side *** fundamental principles uncovered here afford insights for the optimization of molecular design of amphiphilic comb-like copolymers in various applications.

关键词： Comb-like copolymer Conformation Selective solvent Brownian dynamics

Stability of the Phase Separation State for Compressible Navier-Stokes/Allen-Cahn System

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 45-74页

作者： ya-zhou Chen Hakho Hong Xiao-ding Shi Department of Mathematics College of Mathematics and PhysicsBeijing University of Chemical TechnologyBeijing100029China Institute of Mathematics State Academy of SciencesPyongyangKorea

This paper is concerned with the large time behavior of the Cauchy problem for Navier-Stokes/AllenCahn system describing the interface motion of immiscible two-phase flow in 3-D. The existence and uniqueness of global solutions and the stability of the phase separation state are proved under the small initial perturbations. Moreover, the optimal time decay rates are obtained for higher-order spatial derivatives of density,velocity and phase. Our results imply that if the immiscible two-phase flow is initially located near the phase separation state, then under small perturbation conditions, the solution exists globally and decays algebraically to the complete separation state of the two-phase flow, that is, there will be no interface fracture, vacuum, shock wave, mass concentration at any time, and the interface thickness tends to zero as the time t → +∞.

关键词： Navier-Stokes/Allen-Cahn system existence uniqueness large time behavior decay rate

Screening of plane S waves by an array of rigid piles in poroelastic soil

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第5期9卷 589-599页

作者： Yuan-qiang CAI Guang-ya ding Chang-jie XU MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang Universiry Hangzhou 310027 China College of Architecture and Civil Engineering Wenzhou University Wenzhou 325035 China

An array of rigid piles used as a screening barrier for plane shear (S) waves is investigated in a homogeneous unbounded space. The dynamic poroelastic theory of Biot is employed, under the assumption of an incompressible solid grain. Using Fourier-Bessel series, the problem of multiple scattering is solved by imposing continuity conditions and equilibrium conditions at the soil-pile interfaces with the translational addition theorem. A parametric analysis is conducted to investigate the influence of the permeability of poroelastic soil, separation between piles, number of piles and frequency of incident waves on screening effectiveness of the barrier, and the results are compared with those in an elastic soil medium. Computed results show that the intrinsic permeability of the soil medium displays an apparent effect on the screening of plane S waves.

关键词： Array of rigid piles Poroelastic soil Theory of Biot Scattering Screening effectiveness