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Numerical evaluations on the effects of thermal properties on the thermo-mechanical behaviour of a phase change concrete energy pile

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Energy and Built Environment 2023年第1期4卷 1-12页

作者： Weibo Yang Binbin Yang Feng Wang Naidong Jing college of Electrical Energy and Power EngineeringYangzhou UniversityChina Hengtong construction Group co.ltd YangzhouJiangsuChina Jiangsu Tongya Housing Industrialization Technology co.ltd YangzhouJiangsuChina

Energy pile is a kind of economic and efficient geothermal utilization technology that the ground heat exchanger(GHE)used in ground source heat pump(GSHP)is embedded into building pile foundation to realize heat ex-change with surrounding *** phase change material(PCM)into the energy pile can not only reduce the temperature variation and thermal deformation range of energy pile,but also improve its energy storage and heat transfer *** this work,phase change concrete energy pile(PCCEP)is proposed by using PCM as a part of backfill material of energy pile.A three-dimensional numerical model is developed to find the influences of thermal properties of PCCEP on its thermo-mechanical *** to the model,the in-fluences of thermal conductivity,phase change latent heat(PCLE)and phase change temperature(PCT)on the thermal performance and mechanical characteristics of PCCEP are numerically *** can be seen that for improving heat transfer performance of PCCEP,the thermal conductivity should be increased,but from the perspective of reducing change of pile displacement,axial force and side friction resistance,the thermal conduc-tivity should be *** heat release mode,lower PCT and larger PCLE contribute to the improvement of thermal performance of PCCEP,and accordingly the rise range of pile temperature,pile displacement change and pile thermal stress can all be *** experimental validation on the model shows that the simulation values of pile wall middle temperature(PWMT)and pile top displacement are agreed well with the corresponding experimental results,the real-time relative error of PWMT and pile top displacement are respectively within 5.1 and 12%.

关键词： GSHP Energy pile Phase change concrete Thermo-mechanical behaviour Numerical evaluation

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Morphology and Cure Behavior of Multi-walled Carbon Nanotubes-based Thermally conductive Adhesive

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Journal of Wuhan University of Technology(Materials Science) 2014年第3期29卷 451-454页

作者：王军霞晏石林 HE Yunban YAN Fei XIE Beiping School of Science Wuhan University of Technology Guangzhou Yueneng Power Technology Development co.ltd

We evaluated the cure behavior of multi-walled carbon nanotubes （MWCNTs） based thermally conductive adhesive by comprehensively thermal analysis, which presented extremely complicated variability of conversion ratio a as a function of temperature with synergistic action of positive effect and negative volumeblocking effect of MWCNTs and cross-linked network of cured polymer molecules. Due to the decomposition of MWCNTs and degradation of polymer, the mass drop is dramatically obvious over the temperature range of 330-370 ℃. Binary resins filled with acid -treated MWCNTs present similar reaction interval as neat epoxy and matrix resins, which is distinct from the material filled with raw MWCNTs. The alteration of the crystalline temperature and cure temperature of resins is attributed to heterogeneous nucleation of MWCNTs in matrix resins. The --coOH group of acid-treated MWCNTs reacts with epoxy groups and thus generates cross-linking, accelerates the reaction rate and reduces the cure temperature.

关键词： adhesive carbon nanotubcs thermal analysis degradation

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configuration confirmation of Euphorbia Factor L_1 by Single-crystal X-ray Diffraction

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Chinese Journal of Structural Chemistry 2008年第12期27卷 1431-1434页

作者：焦威郁开北鲁润华 Chengdu Institute of Biology Chinese Academy of Sciences Chengdu Organic Chemical co.ltd Chinese Academy of Sciences

A 6,（17）-epoxylathyrol diterpenoid （（2S＊3S＊4R＊5R＊6S＊9S＊11S＊15R＊）-5,15-diacetoxy-3- phenylacetoxy-14-oxolathyra-6（17）,（12E）-diene-6（17）-epoxide） was isolated from the seeds of Euhporbia lathyris L. Its configuration was puzzled because of the incomplete X-ray results reported before. In this work, the atom connectivity and configuration were confirmed by single-crystal X-ray diffraction together with ESI-MS, ^1H-, and ^13C-NMR spectroscopy. The compound crystallizes in monoclinic, space group P21 with a = 11.386（1）, b = 8.2839（7）, c = 17.192（2） A, β = 108.305（2）°, Z = 2, V = 1539.5（2）A^3, C32H40O8, Mr = 552.64, Dc = 1.192 g/m^3, /7（000） = 592,μ（MoKα） = 0.085 mm^-l, T = 293（2） K, the final R = 0.0398 and wR = 0.0950 for 2057 observed reflections with Ⅰ 〉 2α（Ⅰ）. The molecule shows a tricyclic terpenoid skeleton, consisting of fused five-, eleven- and three-membered rings. The configuration at C（5） is R^＊ and that at C（6） S^＊.

关键词： epoxylathyrol diterpenoid Euphorbia lathyris crystal structure

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LOW-POWER SURVIVOR MEMORY ARCHITECTURE FOR DFSE IN 1000BASE-T TRANSCEIVER

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Journal of Electronics(China) 2014年第2期31卷 92-99页

作者： Qiu Bingsen 2012 Laboratories Huawei Technologies Co.Ltd

A novel approach to survivor memory unit of Decision Feedback Sequence Estimator(DFSE) for 1000BASE-T transceiver based on hybrid architecture of the classical register-exchange and trace-back methods is *** proposed architecture is investigated with special emphasis on low power and small decoder latency,in which a dedicated register-exchange module is designed to provide tentative survivor symbols with zero latency,and a high-speed trace back logic is presented to meet the tight latency budget specified for 1000BASE-T ***,clock-gating register banks are constructed for power *** implementation reveals that,the proposed architecture provides about 40% savings in power consumption compared to the traditional register-exchange architecture.

关键词： Survivor memory unit Register exchange Trace back Decision Feedback Sequence Estimator(DFSE) 1000BASE-T

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Engineering optimization approach of nonaqueous electrolyte for sodium ion battery with long cycle life and safety

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Green Energy & Environment 2021年第2期6卷 212-219页

作者： Haiying Che Xinrong Yang Yan Yu Chaoliang Pan Hong Wang Yonghong Deng Linsen Li Zi-Feng Ma Shanghai Electrochemical Energy Devices Research Center Depurment of Chemical EngineeringShanghai Jiao Tong UniversitygShanghai200240China Zhejiang NaTRIUM Energy co.ltd. Shaoxing 312000China Shanghai Zjian Chemical Technology co.ltd Shanghai200241China Shenzhen CAPCHEM Technology co.ltd Shenzhen518027China

Electrolyte design strategies are closely related to the capacities, cycle life and safety of sodium–ion batteries. In this study, we aimed to optimize electrolyte with the focus on engineering aspects. The basic physicochemical properties including ionic conductivity, viscosity,wettability and thermochemical stability of the electrolytes using Na PF6 as the solute and the mixed solvent with different components of EMC,DMC or DEC in PC or EC were systematically measured. Ah pouch cell with NaNi_(1/3)Fe_(1/3)Mn_(1/3)O_(2)/hard carbon electrodes was used to evaluate the performance of the prepared electrolytes. By using the Inductive coupled Plasma Emission Spectrometer(ICP), X-ray photoelectron spectroscopy(XPS), Thermogravimetric-differential scanning calorimetry(TG-DSC) and Accelerating Rate Calorimeter(ARC), we show that an optimized electrolyte can effectively promote the formation of a protective interfacial layer on two electrodes, which not only retards parasitic reactions between the electrodes and electrolyte but also suppresses dissolution of metal ions from the cathode. With an optimized electrolyte, a NaNi_(1/3)Fe_(1/3)Mn_(1/3)O_(2)/hard carbon cell can attain 56.16% capacity retention under the low temperature of -40℃, and can be able to retain 80%capacity retention after more than 2500 cycles while presenting excellent thermal safety.

关键词： Sodium–ion battery NaNi_(1/3)Fe_(1/3)Mn_(1/3)O_(2) Nonaqueous electrolyte Safety Engineering optimization

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Effect of Functional Chemical Admixtures on the Performance of Cement Asphalt Mortar Used in Ballastless Track

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Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 995-1000页

作者：蒋金洋 SHE Wei LI Wei PAN Li Jiangsu Key Laboratory for construction Materials Southeast University Jiangsu Institute of Building Science co.ltd

Chemical admixtures are of paramount importance to the performance of modern cement based composites. In this paper, we performed a series of tests to investigate the effects of chemical admixtures on the cement asphalt mortar(CA mortar), i e, compressive strength, frost resistance, permeability, fatigue resistance, pore structure and microstructure. In particular, two types of chemical admixtures were tested, i e, defoamer(tributyl phosphate(TBP)) and polycarboxylate superplasticizer(PS). The results indicate that the addition of TBP and PS eliminates big bubbles and promotes small non-connected pores forming in matrix. Besides, an optimum dosage of TBP and PS may be determined with respect to the frost resistance, permeability and fatigue resistance of CA mortar. Further elaborative discussions are presented as well as experimental evidences from mercury intrusion porosimetry, scanning electron microscopy and energy dispersive spectroscopy.

关键词： cement asphalt mortar chemical admixture frost resistance fatigue resistance pore structure microstructure

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GPU-accelerated scanning path optimization in particle cancer therapy

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Nuclear Science and Techniques 2019年第4期30卷 27-34页

作者： Chao Wu Yue-Hu Pu Xiao Zhang Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai APACTRON Particle Equipment co.ltd

When using the beam scanning method for particle beam therapy, the target volume is divided into many iso-energy slices and is irradiated slice by slice. Each slice may comprise thousands of discrete scanning beam positions. An optimized scanning path can decrease the transit dose and may bypass important organs. The minimization of the scanning path length can be considered as a variation of the traveling salesman problem; the simulated annealing algorithm is adopted to solve this problem. The initial scanning path is assumed as a simple zigzag path;subsequently, random searches for accepted new paths are performed through cost evaluation and criteria-based judging. To reduce the optimization time of a given slice,random searches are parallelized by employing thousands of threads. The simultaneous optimization of multiple slices is realized by using many thread blocks of generalpurpose computing on graphics processing units *** on a computer with an Intel i7-4790 CPU and NVIDIA K2200 GPU, our new method required only 1.3 s to obtain optimized scanning paths with a total of 40 slices in typically studied cases. The procedure and optimization results of this new method are presented in this work.

关键词： Particle beam therapy Treatment planning Scanning path optimization

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Tribological characteristics of C/C-SiC braking composites under dry and wet conditions

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中国有色金属学会会刊：英文版 2008年第5期18卷 1071-1075页

作者：李专肖鹏熊翔朱苏华 State Key Laboratory of Powder Metallurgy Central South University Hunan Boyun New Material co.ltd

C/C-SiC braking composites,based on reinforcement of carbon fibers and matrices of carbon and silicon carbide,were fabricated by warm compaction and in situ reaction *** tribological characteristics of C/C-SiC braking composites under dry and wet conditions were investigated by means of MM-1000 type of friction testing *** influence of dry and wet conditions on the tribological characteristics of the C/C-SiC composites was *** dry condition,C/C-SiC braking composites show superior tribological characteristics,including high coefficient of friction (0.38),good abrasive resistance (thickness loss is 1.10 μm per cycle) and steady *** main wear mechanism is plastic deformation and abrasion caused by *** wet condition,frictional films form on the worn *** coefficient of friction (0.35) could maintain mostly,and the thickness loss (0.70 μm per cycle) reduces to a certain ***,braking curves are steady and adhesion and oxidation are the main wear mechanisms.

关键词： C/C-SiC 焊接条件摩擦特征制动复合材料

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Fast Beam Deflection and Beam Quality- Keys to Economic High Quality Electron Beam Applications

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稀有金属材料与工程 2011年第S4期40卷 90-94页

作者： Uwe Clauβ James Bull Pro-Beam AG & co.KGaA Pro-Beam electron beam technology Suzhou co.ltd

Since its first introduction to the industry the control systems of electron beam machines have gone through an enormous *** the availability of fast amplifier components and digital beam controllers the advantages of the electron beam have further increased making it a truly software controlled thermal processing *** beam controllers enable multi-beam and multi-focus technologies,where the beam is split in up to 60 individual *** technologies can reduce the processing time by parallel processing or improve the quality by optimized thermal expansion of the ***-process technologies,where several processes are performed in one run (*** and cosmetic treatment) further extend the application range of the electron beam *** beam deflection in conjunction with electron-optical monitoring is the fundamental component for advanced seam tracking *** allow automating the EB application in order to optimize the process costs and improve the quality of the re-sults in a reproducible *** for a high quality of the EB process is the condition of the tool,the electron beam *** in-troducing the beam parameter product to the electron beam,reliable information about the quality of the beam can be ***-plemented into automatic beam alignment systems repeatable results with high quality are achieved.

关键词： electron beam control system fast beam deflection multi-beam technology multi-focus technology electron-optical monitoring seam tracking systems beam parameter product beam quality automatic beam alignment

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Research on anti-attack performance of a private cloud safety computer based on the Markov-Percopy dynamic heterogeneous redundancy structure

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Transportation Safety and Environment 2023年第4期5卷 107-116页

作者： Jiakun Wen Zhen Liu Huan Ding CRSC Research&Design Institute Group co.ltd Beijing 100070China

With the increasing computing demand of train operation control systems,the application of cloud computing technology on safety computer platforms of train control system has become a research hotspot in recent *** to improve the safety and availability of private cloud safety computers is the key problem when applying cloud computing to train operation control *** the cloud computing platform is in an open network environment,it can face many security loopholes and malicious network ***,it is necessary to change the existing safety computer platform structure to improve the attack resistance of the private cloud safety computer platform,thereby enhancing its safety and ***,a private cloud safety computer platform architecture based on dynamic heterogeneous redundant(DHR)structure is proposed,and a dynamic migration mechanism for heterogeneous executives is ***,a generalized stochastic Petri net(GSPN)model of a private cloud safety computer platform based on DHR is established,and its steady-state probability is solved by using its isomorphism with the continuous-time Markov model(CTMC)to analyse the impact of different system structures and executive migration mechanisms on the system's anti-attack ***,through experimental verifcation,the system structure proposed in this paper can improve the anti-attack capability of the private cloud safety computer platform,thereby improving its safety and reliability.

关键词： Safety computer logical monitoring method continuous time Markov modelling,cloud computing anti-attack analysis

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