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The Innovation 2024年第2期5卷 70-78页

作者： Kun Zhang Zhe Zhang Hailong Pan Haoyu Wang Xueting Zhao Ji Qi Zhao Zhang Ruiqi Song Chenyang yu Biaohong Huang Xujing Li Huaican Chen Wen Yin Changlong Tan Weijin Hu Michael Wüubbenhorst Jiangshui Luo dehong yu Zhidong Zhang Bing Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Laboratory for Soft Matter and Biophysics Department of Physics and AstronomyKU Leuven3001 LeuvenBelgium Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150080China Australian Nuclear Science and Technology Organisation Lucas HeightsNSW 2234Australia

Heat is almost *** electricity,which can be easily manipulated,the current ability to control heat is still highly limited owing to spontaneous thermal dissipation imposed by the second law of *** illumination and pressure have been used to switch endothermic/exothermic responses of materials via phase transitions;however,these strategies are less cost-effective and ***,we spectroscopically demonstrate the glassy crystal state of 2-amino-2-methyl-1,3-propanediol(AMP)to realize an affordable,easily manageable approach for thermal energy *** supercooled state of AMP is so sensitive to pressure that even several megapascals can induce crystallization to the ordered crystal,resulting in a substantial temperature increase of 48 K within 20 ***,we demonstrate a proof-of-concept device capable of programable heating with an extremely high work-to-heat conversion effi-ciency of*** delicate and efficient tuning of heat may remarkably facilitate rational utilization of waste heat.

关键词： illumination thermal rational

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3D打印个体化模体在胸部调强治疗计划中的剂量学研究

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中国医学装备 2024年第2期21卷 37-41页

作者：陈晶晶陈宏林于德洪尹敏徐州医科大学附属邳州医院放疗科徐州221300 徐州市肿瘤医院放疗科徐州221005

目的:利用3D打印技术制作反映患者真实情况的3D打印个体化模体,分析3D打印个体化模体内各器官CT值及放射治疗剂量分布。方法:根据患者定位CT图像重建并3D打印出各器官的三维立体结构空壳,以CT值为依据选择各器官的等效材料进行填充,即... 详细信息

目的:利用3D打印技术制作反映患者真实情况的3D打印个体化模体,分析3D打印个体化模体内各器官CT值及放射治疗剂量分布。方法:根据患者定位CT图像重建并3D打印出各器官的三维立体结构空壳,以CT值为依据选择各器官的等效材料进行填充,即得到体现患者结构特征的个体化胸部模体。将患者治疗计划纳入患者图像组,将患者治疗计划移植到3D打印个体化模体上的计划纳入模体图像组,比较两组计划的剂量学参数。结果:模体图像组患者图像的左右肺脏、软组织、骨松质、骨密质和心脏的平均CT值分别为-709、-737、14、144、760和28 HU。模体图像CT值与患者定位图像CT值比较,误差均<16.7%。两组图像上放射治疗计划的正常组织受量均能满足临床要求;靶区剂量学参数最小剂量(Dmin)、平均剂量(Dmean)、98%、50%和2%的靶区体积对应的剂量(D98%、D50%和D2%)、适形指数(CI)、均匀指数(HI)、机器跳数(MU)均能满足临床要求,且均无统计学差异;靶区最大剂量(Dmax)差异有统计学意义(t=2.678,P<0.05),其中模体图像组Dmax偏大,为(56.97±0.32)Gy。结论:最终设计的模体在放射治疗中的CT值、组织结构、空间分布上均可以仿真人体胸部,验证了3D打印模体在放射治疗质量保证中用于剂量测量的可行性。

关键词： 3D打印个体化模体组织等效材料调强放射治疗

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Modeling and Analysis of A Rotary Direct Drive Servovalve

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 1064-1074页

作者： yu Jue ZHUANG Jian yu dehong School of Mechanical Engineering Xi'an Jiaotong University

Direct drive servovalves are mostly restricted to low flow rate and low bandwidth applications due to the considerable flow *** studies mainly focus on enhancing the driving force,which in turn is limited to the development of the magnetic *** at reducing the flow forces,a novel rotary direct drive servovalve（RDDV）is introduced in this *** RDDV servovalve is designed in a rotating structure and its axially symmetric spool rotates within a certain angle range in the valve *** servovalve orifices are formed by the matching between the square wave shaped land on the spool and the rectangular ports on the *** order to study the RDDV servovalve performance,flow rate model and mechanical model are established,wherein flow rates and flow induced torques at different spool rotation angles or spool radiuses are *** model analysis shows that the driving torque can be alleviated due to the proposed valve *** fluid dynamics（CFD）analysis using ANSYS/FLUENT is applied to evaluate and validate the theoretical *** addition,experiments on the flow rate and the mechanical characteristic of the RDDV servovalve are carried *** simulation and experimental results conform to the results of the theoretical model analysis,which proves that this novel and innovative structure for direct drive servovalves can reduce the flow force on the spool and improve valve frequency response *** research proposes a novel rotary direct drive servovalve,which can reduce the flow forces effectively.

关键词： direct drive servovalve computational fluid dynamics(CFD) flow rate flow induced torque

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Multi-objective Optimal Design of High Frequency Probe for Scanning Ion Conductance Microscopy

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Chinese Journal of Mechanical Engineering 2016年第1期29卷 195-203页

作者： GUO Renfei ZHUANG Jian MA Li LI Fei yu dehong School of Mechanical Engineering Xi’an Jiaotong University School of Science Xi’an Jiaotong University Bioinspired Engineering and Biomechanics Center(BEBC) Xi’an Jiaotong University

Scanning ion conductance microscopy（SICM） is an emerging non-destructive surface topography characterization apparatus with nanoscale resolution. However, the low regulating frequency of probe in most existing modulated current based SICM systems increases the system noise, and has difficulty in imaging sample surface with steep height changes. In order to enable SICM to have the capability of imaging surfaces with steep height changes, a novel probe that can be used in the modulated current based bopping mode is designed. The design relies on two piezoelectric ceramics with different travels to separate position adjustment and probe frequency regulation in the Z direction. To fiarther improve the resonant frequency of the probe, the material and the key dimensions for each component of the probe are optimized based on the multi-objective optimization method and the finite element analysis. The optimal design has a resonant frequency of above 10 kHz. To validate the rationality of the designed probe, microstructured grating samples are imaged using the homebuilt modulated current based SICM system. The experimental results indicate that the designed high frequency probe can effectively reduce the spike noise by 26% in the average number of spike noise. The proposed design provides a feasible solution for improving the imaging quality of the existing SICM systems which normally use ordinary probes with relatively low regulating frequency.

关键词： scanning ion conductance microscopy(SICM) multi-objective optimization high frequency probe finite element analysis,imaging quality

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Tungsten separation behavior on preparation of high-purity cerium by combined vacuum gravity sedimentation-directional solidification

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Journal of Rare Earths 2024年第6期42卷 1182-1186,I0007页

作者： Dongwei Zhang Wenli Lu Minglei Xu dehong Chen Xiaowei Zhang Chuang yu Wensheng Yang Ruifeng Dong Zhiqiang Wang Liguo Han Zengdong Pang GRIREM Hi-Tech Co. Ltd.Langfang065201China National Engineering Research Center for Rare Earth China GRINM Group Co.Ltd.Beijing100088China GRIREM Advanced Materials Co. Ltd.Beijing100088China

In light of the difficult removal of harmful impurity tungsten(W)in Ce metal,in this paper a combined vacuum gravity sedimentation-directional solidification method was innovatively designed and the W separation behavior was *** reducing the electron beam power instantly and gradually at reduction rates of 1,3 and 5 kW/min,it is found that W is enriched at the bottom of ingots as the melt *** enrichment effect is much better than that of single purification method and the enrichment degree increases as the beam reduction rate decreases,attributed to the k0(W)>1 andρ(W)>ρ(Ce).Overall,the minimum content of W impurity can decrease from 630 to 0.1 ppm at the top of the ingot,and the purity of Ce increases from 99.932 wt%to 99.995 wt%by this combined ***,this paper provides a new method for the removal of high density and low evaporation coefficient impurities in low vapor pressure rare earth metals.

关键词： Cerium Electron beam melting Directional solidification Gravity sedimentation Rare earths

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Highly collective atomic transport mechanism in high-entropy glass-forming metallic liquids

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Journal of Materials Science & Technology 2019年第1期35卷 44-47页

作者： Changjiu Chen Kaikin Wong Rithin P.Krishnan Lei Zhifeng dehong yu Zhaoping Lu Suresh M.Chathoth Department of Physics City University of Hong Kong State Key Laboratory for Advanced Metals and Materials University of Science and TechnologyBeijing Australian Nuclear Science and Technology Organization

Quasielastic neutron scattering(QENS) has been used to study the atomic relaxation process and microscopic transport mechanism in high-entropy glass-forming metallic(HE-GFM) liquids. Self-intermediate scattering functions obtained from the QENS data show unusually large stretching, which indicates highly heterogeneous atomic dynamics in HE-GFM liquids. In these liquids, a group of atoms over a length scale of about 21 ? diffuses collectively even well above the melting temperature. However, the temperature dependence of diffusion process in one of the HE-GFM liquid is Arrhenius, but in the other HE-GFM liquid it is non-Arrhenius. Although the glass-forming ability of these HE-GFM liquids is very poor, the diffusion coefficients obtained from the QENS data indicate the long range atomic transport process is much slower than that of the best metallic glass-forming liquids at their melting temperatures.

关键词： High-entropy alloy Neutron scattering Atomic relaxation Diffusion

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Multi-functional Materials and Neutron Scatterings

Multi-functional Materials and Neutron Scatterings

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第十六届全国晶体生长与材料学术会议

作者： dehong yu Jiyang Wang Bragg Institute Australian Nuclear Science and Technology OrganizationLucas HeightNSW2234Australia State Key Laboratory of Crystal Materials Shandong University

Neutron is one of the fundamental particles forming atoms and thus *** unique properties of slow neutrons have made the neutron a powerful probe in characterisation

关键词： neutron scattering,material characterization

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Proton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials

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Green Energy & Environment 2017年第3期2卷 294-301页

作者： Krystina Lamb Richard A.Mole dehong yu Roland de Marco John R Bartlett Sarah Windsor San Ping Jiang Jin Zhang Vanessa K.Peterson Faculty of Science.Health Education and EngineeringUniversity of the Sunshine Coast Australian Centre for Neutron Scattering Australian Nuclear Science and Technology Organisation School of Chemistry and Molecular Biosciences The University of Queensland Fuels and Energy Technology Institute Curtin University

Phosphotungstic acid is an excellent proton conductor that can be incorporated into porous supports, and nanocomposite proton exchange membrane materials made from mesoporous silica impregnated with phosphotungstic acid have been suggested for use in fuels cells operating> 100 ℃. In this work, quasielastic neutron scattering was used to study proton self-diffusion in mesoporous disordered and P6 mm symmetry silica impregnated with two concentrations of phosphotungstic acid. Overall, the silica structure had a significantly greater effect on proton conduction and diffusion than phosphotungstic acid concentration, with higher proton conduction occurring for the P6 mm symmetry silica samples. Quasielastic neutron scattering revealed two populations of protons diffusing through each sample, and that proton conduction is limited by the slower of these populations, which diffuse via a jump-diffusion mechanism. Whilst the fundamental jump-diffusion mechanism by which these slower protons moved was found to be similar for both silica supports and phosphotungstic acid concentrations, the faster diffusion occurring in P6 mm structured silica arises from a lower residence time of protons moving between sites in the jump-diffusion model, suggesting a lower energy barrier.

关键词： Fuel cells Neutron scattering Proton conduction Proton exchange membranes Silica

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An Intelligent Neural Networks System for Adaptive Learning and Prediction of a Bioreactor Benchmark Process

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Chinese Journal of Chemical Engineering 2008年第1期16卷 62-66页

作者：邹志云于德弘冯文强于鲁平郭宁 School of Mechanical Engineering Xi＇an Jiaotong University Xi＇an 710049 China Beijing Research Institute of Pharmaceutical Chemistry Beijing 102205 China

适应学习和一个高度非线性、变化时间的生物反应器基准过程的预言用神经原线，为在 G2 实时聪明的环境开发并且部署神经网络的一个图形的工具箱，和新修改 Broyden 被学习，弗莱彻， Goldfarb ，并且 Shanno ( BFGS )伪--牛顿算法。为... 详细信息

适应学习和一个高度非线性、变化时间的生物反应器基准过程的预言用神经原线，为在 G2 实时聪明的环境开发并且部署神经网络的一个图形的工具箱，和新修改 Broyden 被学习，弗莱彻， Goldfarb ，并且 Shanno ( BFGS )伪--牛顿算法。为神经网络被开发并且由介绍学习率到完整的存储器 BFGS 算法的一个新搜索方法嵌进神经原线的背繁殖(BP ) 的适应学习的修改 BFGS 算法。模拟结果证明适应学习和神经网络系统能快速追踪的预言生物反应器的变化时间、非线性的行为。

关键词：生化反应器智能自适应学习预测方法神经元网络系统

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模糊抗饱和补偿器的设计及应用

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西安交通大学学报 2013年第1期47卷 68-73页

作者：俞珏庄健于德弘西安交通大学机械工程学院西安710049

针对采用固定反馈系数的传统抗饱和补偿器难以有效补偿强非线性系统的问题,提出了一种基于模糊思想的抗饱和补偿器。采用基于条件积分法和反计算法的混合补偿方式,对反计算法中所需的补偿系数进行模糊整定,在此基础上,采用硬件描述语言... 详细信息

针对采用固定反馈系数的传统抗饱和补偿器难以有效补偿强非线性系统的问题,提出了一种基于模糊思想的抗饱和补偿器。采用基于条件积分法和反计算法的混合补偿方式,对反计算法中所需的补偿系数进行模糊整定,在此基础上,采用硬件描述语言描述该补偿器的逻辑算法,对算法中的乘、除运算进行优化,并移植到现场可编程门阵列器件中来完成硬件的实现。实验表明,所设计的新型补偿器在直驱式转阀的控制中能够有效地提高控制精度并减少占用资源,阀芯阶跃响应的最大超调量小于3%,需要的等效逻辑门数比未优化前减少了约41%,从而证实了模糊抗饱和补偿器的可行性。

关键词：抗饱和补偿器模糊思想现场可编程门阵列器件转阀

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