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Trajectory optimisation in electrical discharge machining of three-dimensional curved and twisted channels

Chinese Journal of Aeronautics 2022年第4期35卷 473-484页

作者： Jianshe ZHAO Yicong QIU Jian yuan chao LIU College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Laboratory of Integrated Electrical Processing Nanjing HANGPU Machinery Technology Company LimitedNanjing 210000China Military Representative Bureau of the Air Force Equipment Department in Shanghai and Military Representative Office in Zhuzhou Region Zhuzhou 412002China AECC South Industry Company Limited Zhuzhou 412002China

Numerical control electrical discharge machining(NC EDM) is one of the most widely used machining technologies for manufacturing a closed blisk flow path, particularly for three-dimensional(3D) curved and twisted flow channels. In this process, tool electrode design and machining trajectory planning are the key factors affecting machining accessibility and efficiency. Herein, to reduce the difficulty in designing the electrode and its motion path in the closed curved and twisted channels, a heuristic search hybrid optimisation strategy based on channel grids is adopted to realise the initial electrode trajectory design search and optimised size reduction. By transferring the trajectory optimisation constraints from the complex free-form surface to numbered grids, the search is found to be more orderly and accurate. The two trajectory indicators, namely argument angle and minimum distance, are analysed separately for the optimised results of the adaptive learning particle swarm optimisation algorithm, demonstrating that they can meet the actual processing *** results of NC EDM indicate that the motion path generated by this design method can meet the machining requirements of 3D curved and twisted flow channels.

关键词： Blisk Electrical discharge machining(EDM) Electrode Objective functions Trajectory generation

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Interface structure of α-Mg/14H-LPSO:First-principles prediction and experimental study

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Journal of Rare Earths 2024年第9期42卷 1792-1799,I0006页

作者： yuan Shi Xiaohua Zhang Hongyan Yue chao Li School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin150040China

The interfacial structure of the α-Mg/14H-LPSO phase in rare earth-including magnesium alloy was investigated via high-angle annular dark-field scanning transmission electron microscopy(HAADFSTEM) imaging and first-principles calculations of density-functional *** possible interfacial models were constructed according to the different terminations of the LPSO phase,and the corresponding interfacial energies were calculated,from which the four most stable structures(Terl-MgY-hollow,Ter2-Zn-hollow,Ter3-MgYII-hollow and Ter4-Mg-bridge) were *** interfacial phase diagrams related to the Y chemical potentials were obtained from the calculations,and the most stable interfacial structure was ***-MgY-hollow and Ter2-Zn-hollow have the lowest interfacial energies in the range of-0.7 eV <Δμγ<-0.6 eV,where fluctuating change of state is the minimized and the interface is the most *** separation work of the two models was calculated to predict the bonding strength of the structures at both ends of the *** calculation results show that the maximum interfacial separation work is 1.45 J/m^(2) for the interface model of α-Mg and 14H-LPSO phase structure with Ter2-Zn-hollow termination.

关键词： Rare earths Magnesium alloy HAADF-STEM LPSO First-principles Interface

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Optimal Coordinated Bidding Strategy of Wind and Solar System with Energy Storage in Day-ahead Market

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 192-203页

作者： Yinping Yang chao Qin yuan Zeng Chengshan Wang School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

Although wind and solar power is the major reliable renewable energy sources used in power grids,the fluctuation and unpredictability of these renewable energy sources require the use of ancillary services,thereby increasing the integration *** study proposes a wind,solar,and pumped-storage cooperative(WSPC)model that can be applied to large-scale systems connected to dispersed renewable energy *** model provides an optimized coordinated bidding strategy in the day-ahead market,along with a method to facilitate revenue distribution among participating *** model takes advantage of the natural complementary characteristics of wind and solar power while using pumped storage to adjust the total output *** the coordinated bidding strategy,a proportion of the energies is provided as firm power,which can lower the ancillary service ***,a multi-period firm power-providing mode is adopted to reflect the wind-solar output characteristics of each period *** duration of each period is selected as a variable to accommodate seasonal *** ensures that the provision of firm power can maintain a high proportion under varied connected ratios of wind-solar,thereby obtaining higher *** using the revenue distribution method,the short-term influencing factors of the cooperative model are considered to provide the economic characteristics of wind farms and photovoltaic *** this way,revenue distribution can be fairly realized among the participating ***,the effectiveness and economy of the proposed model are validated based on actual data obtained from the power grid in California,USA.

关键词： Wind energy solar energy energy storage energy resources power system economics

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Neuromodulation of Chemical Synaptic Transmission Driven by THz Photons

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Research 2023年第3期2022卷 221-228页

作者： Xiaoxuan Tan yuan Zhong Ruijie Li chao Chang Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense Technology.Beijing 100071China Astronaut Center of China Beijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Brain Research Center and State Key Laboratory of Trauma Burnsand Combined InjuryThird Military Medical UniversityChongqing 400038China

Postsynaptic currents of chemical synapse are modulated by multitudinous neurotransmitters,such as acetylcholine,dopamine,glutamate,andγ-aminobutyric acid,many of which have been used in the treatment of neurological ***,based on molecular dynamics simulations and quantum chemical calculation,we propose that 30-to 45-THz photons can resonate with a variety of typical neurotransmitter molecules and make them absorb photon energy to activate the transition to high energy state,which is expected to be a new method of neural ***,we verified the calculated results through experiments that THz irradiation could substantively change neuronal signal emission and enhance the frequency,amplitude,and dynamic properties of excitatory postsynaptic current and inhibitory postsynaptic *** addition,we demonstrated the potential of neural information regulation by THz photons through 2-photon imaging in *** findings are expected to improve the understanding of the physical mechanism of biological phenomena and facilitate the application of terahertz technology in neural regulation and the development of new functional materials.

关键词： materials verified finding

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Analysis and Verification of the Relationship between the Maximum Mass Sensitivity of Quartz Crystal Microbalance and Electrode Parameters

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Chinese Physics Letters 2019年第7期36卷 23-26页

作者： Wei Pan Xian-He huang Qiao Chen Zhi-chao Fan yuan Xu School of Automation Engineering University of Electronic Science and Technology of China

We analyze the effect of electrode diameter and thickness on the mass sensitivity. Through the theoretical approximate calculation, we find that the mass sensitivity does not change monotonically with electrode diameter and there is a maximum point. The optimum electrode diameter corresponding to the maximum mass sensitivity varies with the electrode thickness. For a particular electrode diameter, a quartz crystal microbalance(QCM)with thick electrode has a higher mass sensitivity. A proper plating experiment using 35 QCMs with different electrode diameters and thicknesses verifies this finding. The present study further reveals how electrode size affects mass sensitivity and is helpful for QCM design.

关键词： effect of electrode mass sensitivity QCM design

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Strain concentration factor of heterogeneous materials and analytical influence functions based on Eshelby tensor

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Theoretical & Applied Mechanics Letters 2024年第4期14卷 306-313页

作者： Shanqiao huang Zifeng yuan HEDPS Center for Applied Physics and TechnologyDepartment of Mechanics and Engineering SciencePeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing 100871China

In this manuscript,Eshelby tensor is employed to assess the strain concentration that arises in the matrix phase at the interface,offering precise values and locations of maximum strain under specific loading conditions for both spherical and cylindrical *** compared to numerical simulation results,the analytical predictions grounded in the Eshelby tensor exhibit satisfactory *** an analytical calculation method based on Eshelby tensor for the elastic strain influence functions of reduced-order homogenization(ROH)method is developed and adopted on particle-reinforced and fibrous composites,presenting its feasibility and advantage on off-line stage calculation of ROH *** error analyses between analytical and numerical results are *** numerical results also exhibit the necessity of finer interface partitioning to obtain the response on micro-scale with higher resolution.

关键词： Eshelby tensor Strain concentration Composite structures Reduced-order-homogenization Influence functions

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Study on the effect of thermal deformation on the liquid seal of high-temperature molten salt pump in molten salt reactor

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Nuclear Science and Techniques 2023年第2期34卷 128-138页

作者： Xing‑chao Shen yuan Fu Jian‑Yu Zhang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The high-temperature molten salt pump is the core equipment in a molten salt reactor that drives the flow of the molten salt *** stability is key to the continuous and reliable operation of the molten salt pump,and the liquid seal at the wear ring can affect the dynamic characteristics of the rotor *** the molten salt pump is operated in the hightemperature molten salt medium,thermal deformation of the submerged parts inevitably occurs,changing clearance between the stator and rotor,affecting the leakage and dynamic characteristics of the *** this study,the seal leakage,seal dynamic characteristics,and rotor system dynamic characteristics are simulated and analyzed using finite element simulation software based on two cases of considering the effect of seal thermal deformation effect or *** results show a significant difference in the leakage characteristics and dynamic characteristics of the seal obtained by considering the effect of seal thermal deformation and neglecting the effect of thermal *** leakage flow rate decreases,and the first-order critical speed of the seal-bearing-rotor system decrease after considering the seal’s thermal deformation.

关键词： High-temperature molten salt pump Seal thermal deformation Leakage characteristics Seal dynamic characteristics Critical speed

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Vascular reconstruction provides short-term and long-term survival benefits for patients with hilar cholangiocarcinoma:A retrospective,multicenter study

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Hepatobiliary & Pancreatic Diseases International 2024年第6期23卷 595-603页

作者： Yi-Xian huang chao Xu Cheng-Cheng Zhang Guang-Yi Liu Xing-chao Liu Hai-Ning Fan Bi Pan yuan-Cheng Li Department of Hepatobiliary Surgery Southwest HospitalThird Military Medical University(Army Medical University)Chongqing 400038China Department of Hepatobiliary Surgery Liaocheng People’s HospitalLiaocheng 252000China Sichuan Academy of Medical Sciences&Sichuan Provincial People’s Hospital Chengdu 610000China Qinghai University Affiliated Hospital Xining 810016China

Background:In patients with hilar cholangiocarcinoma(HCCA),radical resection can be achieved by resection and reconstruction of the ***,whether vascular reconstruction(VR)improves long-term and short-term prognosis has not been demonstrated ***:This was a retrospective multicenter study of patients who received surgery for HCCA with or without *** associated with overall survival(OS)and recurrence-free survival(RFS)were identified based on Cox ***-Meier curves were used to explore the impact of *** mean survival time(RMST)was used for comparisons of short-term survival between the ***’intraoperative and postoperative characteristics were ***:Totally 447 patients were *** divided these patients into 3 groups:VR with radical resections(n=84);non-VR radical resections(n=309)and non-radical resection(we pooled VRnonradical and non-VR nonradical together,n=54).Cox regression revealed that carbohydrate antigen 242(CA242),vascular invasion,lymph node metastasis and poor differentiation were independent risk factors for OS and *** was no significant difference of RMST between the VR and non-VR radical groups within 12 months after surgery(10.18 vs.10.76 mon,P=0.179),although the 5-year OS(P<0.001)and RFS(P<0.001)were worse in the VR radical *** incidences of most complications were not significantly different,but those of bile leakage(P<0.001)and postoperative infection(P=0.009)were higher in the VR radical group than in the non-VR radical ***,the levels of alanine aminotransferase(ALT)and aspartate aminotransferase(AST)up to 7 days after surgery tended to decrease in all *** was no significant difference in the incidence of postoperative liver failure between the VR and non-VR radical ***:Radical resection can be achieved with VR to improve the survival rate without worsening short-term survival compared with resection wit

关键词： Hilar cholangiocarcinoma Hepatectomy Vascular reconstruction Prognosis

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Oxygen vacancies enriched Ir/WOx catalysts for the directly chem-catalytic conversion of cellulose to ethanol

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Tungsten 2025年第1期 88-99页

作者： Yu-Jing Weng Zhao-Ying Ding Ying-chao Li yuan-Feng Wu yuan-Yang Xu Rui Chen Xiao-Lei Zhao Hai-Yong Wang Da-Lei Zhang Yu-Long Zhang Henan Key Laboratory of Coal Green Conversion and International Joint Laboratory of Coal Clean Utilization College of Chemistry and Chemical Engineering Henan Polytechnic University Key Laboratory of Renewable Energy Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Liaoning Institute of Energy Technology

Tungsten and its oxides are highly versatile catalysts with unique properties that hold great promise for a wide array of applications,including biological pathways and chemical *** chemo-catalysis of cellulose to ethanol presents a promising avenue for ethanol synthesis with the potential for enhanced efficiency compared to conventional methods,offering a sustainable and carbon-neutral alternative to existing petrochemical and biological ***,Ir/WOxcatalysts enriched with oxygen vacancies were meticulously prepared and demonstrated remarkable catalytic performance in converting cellulose to ethanol directly in the presence of tungstic *** catalyst achieved a high ethanol yield of 66.5%under optimal reaction conditions,approaching the theoretical yield limit of traditional ethanol *** results revealed the presence of oxygen defects,Bronsted/Lewis acidity,and Ir nanoclusters on the catalyst surface,working synergistically to facilitate the cascade catalysis of cellulose hydrolysis,sugar retro-aldol condensation reaction,and C2 intermediate hydrodeoxygenation to *** situ Fourier transform infrared spectrometer analysis confirmed the catalyst's ability to enhance the adsorption and activation of ethylene glycol for ethanol *** manipulating subtle structural features,this study offers a fresh perspective on tungsten group catalyst design and underscores the importance of synergistic effects among catalytic sites for the efficient production of ethanol from cellulose.

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High thermoelectric performance at room temperature of n-type Mg_(3)Bi_(2)-based materials by Se doping

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Journal of Magnesium and Alloys 2022年第4期10卷 1024-1032页

作者： Xiaobo Mo Jiansong Liao Guocai yuan Sha Zhu Xiaobo Lei Lihong huang Qinyong Zhang chao Wang Zhifeng Ren Key Laboratory of Fluid and Power Machinery of Ministry of Education School of Materials Science&EngineeringXihua UniversityChengdu 610039China Clean Energy Materials and Engineering Center State Key Laboratory of Electronic Thin Film and Integrated DeviceSchool of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China Department of Physics and TcSUH University of HoustonHoustonTX 77204United States

Bi_(2)Te_(3) based alloys have been the most widely used thermoelectric material at low temperature for many *** we report Se doped n-type Mg_(3)Bi_(2) based materials with a thermoelectric figure-of-merit ZT of 0.82 at 300 K and a peak ZT of 1.24 at 498 K,which is comparable to the n-type Bi_(2)Te_(3) and Te doped Mg_(3)Bi_(1.4)Sb_(0.6).The improved thermoelectric performance is benefited from the high carrier concentration and mobility as well as the thermal conductivity *** reduced resistivity increased the power factor at all measured temperatures,leading to a higher engineering ZT(ZTeng)and engineering power factor(PFeng)for n-type Mg_(3)Bi_(2).The n-type Mg_(3)Bi_(1.4)Sb_(0.6) materials are promising for thermoelectric power generation and cooling applications near room temperature.

关键词： Mg_(3)Bi_(2) Zintl compound Thermoelectric Se-doping

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