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Multiphysics simulation and optimization of the in-situ beneficiation process of ilmenite minerals from lunar regolith

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Science China Earth Sciences 2025年第1期68卷 195-207页

作者： Peng zhang Xin LIU Guanghui LIU Wei DAI Hanzhe yang Haibo ZHENG Zhi WANG Ran NIU Yifan BAI yang zhang Chengbao LIU Ge yang Junwei yang Guang zhang Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing Hegong Simulation Co. Ltd

The exploration and utilization of lunar resources have become the major objectives of future lunar exploration missions. The classified collection and processing of lunar minerals is the basic prerequisite for the in-situ exploration and utilization of lunar resources. In this study, we propose a scheme for in-situ separation of magnetic minerals from lunar soils using the dry magnetic separation method. The scheme can realize the purpose of separating magnetic minerals from lunar regolith by altering the motion trajectory of lunar regolith particles with different magnetic properties. Detailed modeling of the dry magnetic separation device is conducted, and the three-dimensional distribution of magnetic parameters is calculated and analyzed. Based on the characterization and analysis of the Chang E-5's samples, the morphologies and physical parameters of lunar regolith particles are modeled and simulated. A discrete element simulation of the motion process of lunar regolith particles under multi-physical field conditions is performed, and the influences of key parameters on the beneficiation performance of lunar magnetic minerals are investigated. Our results indicate that optimal separation and beneficiation of lunar regolith particles can be achieved under specific conditions of magnetic field strength and drum speed. Additionally, we analyze the effects of lunar weak gravity conditions and the charged nature of lunar particles on the beneficiation process, showing that these factors can obviously enhance the beneficiation process of lunar ilmenites. This study demonstrates the feasibility of using the dry magnetic separation method for the beneficiation of magnetic minerals from lunar regolith, providing a theoretical basis for the scientific tasks of collecting, processing, and utilizing lunar mineral resources.

关键词： Lunar regolith In-situ resource utilization Magnetic separation Classified sampling

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Interpretable Machine Learning Method for Compressive Strength Prediction and Analysis of Pure Fly Ash-based Geopolymer Concrete

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 65-78页

作者： SHI Yuqiong LI Jingyi zhang yang LI Li Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F Uni-versityYangling 712100China College of Water Resources and Architectural Engineering Northwest A&F UniversityYangling 712100China Chongqing Key Laboratory of Public Big Data Security Technology Chongqing 401420China Chongqing College of Mobile Communication Chongqing 401520China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina National Rail Transit Electrification and Automation Engineering Technology Research Center(Hong Kong Branch) The Hong Kong Polytechnic UniversityKowloonHung HomHong KongChina

In order to study the characteristics of pure fly ash-based geopolymer concrete(PFGC)conveniently,we used a machine learning method that can quantify the perception of characteristics to predict its compressive *** this study,505 groups of data were collected,and a new database of compressive strength of PFGC was *** order to establish an accurate prediction model of compressive strength,five different types of machine learning networks were used for comparative *** five machine learning models all showed good compressive strength prediction performance on *** them,R2,MSE,RMSE and MAE of decision tree model(DT)are 0.99,1.58,1.25,and 0.25,*** R2,MSE,RMSE and MAE of random forest model(RF)are 0.97,5.17,2.27 and 1.38,*** two models have high prediction accuracy and outstanding generalization *** order to enhance the interpretability of model decision-making,we used importance ranking to obtain the perception of machine learning model to 13 *** 13 variables include chemical composition of fly ash(SiO_(2)/Al_(2)O_(3),Si/Al),the ratio of alkaline liquid to the binder,curing temperature,curing durations inside oven,fly ash dosage,fine aggregate dosage,coarse aggregate dosage,extra water dosage and sodium hydroxide *** temperature,specimen ages and curing durations inside oven have the greatest influence on the prediction results,indicating that curing conditions have more prominent influence on the compressive strength of PFGC than ordinary Portland cement *** importance of curing conditions of PFGC even exceeds that of the concrete mix proportion,due to the low reactivity of pure fly ash.

关键词： machine learning pure fly ash geopolymer compressive strength feature perception

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基于LabVIEW的拖拉机电气故障诊断系统设计

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农机化研究 2025年第2期47卷 239-243,248页

作者：张扬山西职业技术学院太原030006

设计了一种基于LabVIEW的拖拉机电气故障诊断系统,其采用模块化设计,可以自动检测和诊断拖拉机的电气故障,并提供可视化的诊断结果。系统由数据采集模块、信号处理模块、故障诊断模块和用户界面模块组成。数据采集模块负责采集拖拉机各... 详细信息

设计了一种基于LabVIEW的拖拉机电气故障诊断系统,其采用模块化设计,可以自动检测和诊断拖拉机的电气故障,并提供可视化的诊断结果。系统由数据采集模块、信号处理模块、故障诊断模块和用户界面模块组成。数据采集模块负责采集拖拉机各个部件的电气参数数据,信号处理模块对采集到的数据进行处理和分析,故障诊断模块通过分析处理后的数据来判断拖拉机是否存在故障,并给出相应的诊断结果,用户界面模块提供友好的交互界面。试验结果表明:系统可以准确地诊断拖拉机的电气故障,具有良好的应用前景和推广价值。

关键词：拖拉机电气故障诊断 LabVIEW 数据采集模块化设计

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Strong Energy Condition of Simple Gauge Field System

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Chinese Physics Letters 1998年第8期15卷 622-624页

作者： zhang yang Astrophysics Center University of Science and Technology of ChinaHefei 230026

An investigation is carried out for the violation of the strong energy condition by a generic field system consisting of charged scalar boson condensate,fermions,and U(1)gauge *** Bose-Einstein condensation of the system is also studied by the Hamiltonian *** is found that the strong energy condition can be violated by this quantum field system at high densities.

关键词： field system gauge

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Origin of the Negative Pressure for Relativistic Boson Condensate

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Chinese Physics Letters 2000年第1期17卷 76-78页

作者： zhang yang Astrophysics Center University of Science and Technology of ChinaNational Astronomical ObservatoriesChinese Academy of SciencesHefei 230026

We study the physical origin of the negative pressure for quantum scalar fields in inffationary *** vacuum state and other quantum coherent states are explicitly constructed for the charged and uncharged relativistic ... 详细信息

关键词： quantum coherent relativistic

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“In front of patients,I will always be a pupil.”*** zhang:the founder of the modern Chinese gastroenterology

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Protein & Cell 2019年第1期10卷 1-4页

作者： Lu Wang Xudong Liu Wenli Duan Shu-yang zhang Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China

*** zhang(张教骞,Hsiao-Chien Chang)was an outstanding clinician,therapist and medical educator,a member of the Academic Divisions of the Chinese Academy of Sciences,he is considered to be the founder of the modern Chinese gastroenterology(PUMCH,1988).As a doctor,he made a systemic and deep research on human blood volume,gastric secretion function,peptic ulcer disease,gastric ulcer and gastric cancer,celiac tuberculosis,amoebic dysentery,ulcerative colitis and so *** diagnosed and treated multiple intractable *** an educator,he emphasized the training of clinical basic skills,urged students to grasp the utilization of science in study and *** trained a large number of talents for Chinese medicine.

关键词： be multiple doctor basic grasp he

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A New Method for Type Synthesis of 2R1T and 2T1R 3-DOF Redundant Actuated Parallel Mechanisms with Closed Loop Units

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 134-157页

作者： Yongquan Li yang zhang Lijie zhang Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao066004China Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao066004China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518052China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan UniversityQinhuangdao066004China

The current type synthesis of the redundant actuated parallel mechanisms is adding active-actuated kinematic branches on the basis of the traditional parallel mechanisms,or using screw theory to perform multiple getting intersection and union to complete type *** number of redundant parallel mechanisms obtained by these two methods is *** this paper,based on Grassmann line geometry and Atlas method,a novel and effective method for type synthesis of redundant actuated parallel mechanisms(PMs)with closed-loop units is ***,the degree of freedom(DOF)and constraint line graph of the moving platform are determined successively,and redundant lines are added in constraint line graph to obtain the redundant constraint line graph and their equivalent line graph,and a branch constraint allocation scheme is formulated based on the allocation ***,a scheme is selected and redundant lines are added in the branch chains DOF graph to construct the redundant actuated branch chains with closed-loop ***,the branch chains that meet the requirements of branch chains configuration criteria and F&C(degree of freedom&constraint)line graph are *** this paper,two types of 2 rotational and 1 translational(2R1T)redundant actuated parallel mechanisms and one type of 2 translational and 1 rotational(2T1R)redundant actuated parallel mechanisms with few branches and closed-loop units were taken as examples,and 238,92 and 15 new configurations were *** the mechanisms contain closed-loop units,and the mechanisms and the actuators both have good ***,all the mechanisms have excellent comprehensive performance,in which the two rotational DOFs of the moving platform of 2R1T redundant actuated parallel mechanism can be independently *** instantaneous analysis shows that all mechanisms are not instantaneous,which proves the feasibility and practicability of the method.

关键词： Redundant actuated Parallel mechanisms Type synthesis Atlas method Instantaneous analysis

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Turbine Endwall Film Cooling With Combustor-Turbine Interface Gap Leak- age Flow: Effect of Incidence Angle

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Journal of Thermal Science 2013年第2期22卷 135-144页

作者： zhang yang YUAN Xin Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University

This paper is focused on the film cooling performance of combustor-turbine leakage flow at off-design condition. The influence of incidence angle on film cooling effectiveness on first-stage vane endwall with combustor-turbine interface slot is studied. A baseline slot configuration is tested in a low speed four-blade cascade comprising a large-scale model of the GE-E 3 Nozzle Guide Vane (NGV). The slot has a forward expansion angle of 30 deg. to the endwall surface. The Reynolds number based on the axial chord and inlet velocity of the free-stream flow is 3.5 × 10 5 and the testing is done in a four-blade cascade with low Mach number condition (0.1 at the inlet). The blowing ratio of the coolant through the interface gap varies from M = 0.1 to M = 0.3, while the blowing ratio varies from M = 0.7 to M = 1.3 for the endwall film cooling holes. The film-cooling effectiveness distributions are obtained using the pressure sensitive paint (PSP) technique. The results show that with an increasing blowing ratio the film-cooling effectiveness increases on the endwall. As the incidence angle varies from i = +10 deg. to i = 10 deg., at low blowing ratio, the averaged film-cooling effectiveness changes slightly near the leading edge suction side area. The case of i = +10 deg. has better film-cooling performance at the downstream part of this region where the axial chord is between 0.15 and 0.25. However, the disadvantage of positive incidence appears when the blowing ratio increases, especially at the upstream part of near suction side region where the axial chord is between 0 and 0.15. On the main passage endwall surface, as the incidence angle changes from i = +10 deg. to i = 10 deg., the averaged film-cooling effectiveness changes slightly and the negative incidence appears to be more effective for the downstream part film cooling of the endwall surface where the axial chord is between 0.6 and 0.8.

关键词： Film Cooling Endwall Pressure Sensitive Paint Leakage Flow

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An operational happens-before memory model

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Frontiers of Computer Science 2016年第1期10卷 54-81页

作者： yang zhang Xinyu FENG School of Computer Science and Technology University of Science and Technology of China Hefei 230026 China Suzhou Institute for Advanced Study University of Science and Technology of China Suzhou 215123 China

Happens-before memory model （HMM） is used as the basis of Java memory model （JMM）. Although HMM itself is simple, some complex axioms have to be introduced in JMM to prevent the causality loop, which causes absurd out-of-thin-air reads that may break the type safety and se- curity guarantee of Java. The resulting JMM is complex and difficult to understand. It also has many anti-intuitive behav- iors, as demonstrated by the ＂ugly examples＂ by Aspinall and ~ev6~ [1]. Furthermore, HMM （and JMM） specifies only what execution traces are acceptable, but says nothing about how these traces are generated. This gap makes it difficult for static reasoning about programs. In this paper we present OHMM, an operational variation of HMM. The model is specified by giving an operational semantics to a language running on an abstract machine de- signed to simulate HMM. Thanks to its generative nature, the model naturally prevents out-of-thin-air reads. On the other hand, it uses a novel replay mechanism to allow instruc- tions to be executed multiple times, which can be used to model many useful speculations and optimization. The model is weaker than JMM for lockless programs, thus can accom- modate more optimization, such as the reordering of inde- pendent memory accesses that is not valid in JMM. Program behaviors are more natural in this model than in JMM, and many of the anti-intuitive examples in JMM are no longer valid here. We hope OHMM can serve as the basis for new memory models for Java-like languages.

关键词： relaxed memory model happens-before opera-tonal semantics DRF-Guarantee JMM

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Preparation of REPO_4(RE=La–Gd) nanorods from an ionic liquid extraction system and luminescent properties of CePO_4:Tb^(3+)

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Rare Metals 2019年第2期38卷 122-127页

作者： yang zhang Ji Chen State Key Laboratory of Rare Earth Resources Utilization Changchun Institution of Applied Chemistry Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences

Uniform nanorods of rare earth phosphate(REPO_4, RE = La–Gd) nanocrystals were prepared in a properly designed ionic liquid extraction system by a stripping precipitation method. Rare earth ions were extracted into the organic phase at first; after that, the loaded organic phase was stripped by aqueous solution of PO_4^(3-) under stirring at room temperature within 5 *** extractant used here is a bifunctional ionic liquid extractant called [A336][cyanex272]. The products are hexagonal phase in crystal structure, and their morphology is nanorods. The diameter of the products is from 30 to 50 nm, and the length increases from 200 nm to 2 μm gradually. Besides, the ionic liquid-absorbed CePO_4:Tb^(3+) nanorods show improved luminescent emitting intensity and lifetime. Based on the results, a possible growth mechanism of the REPO_4(RE = La–Gd) nanorods is proposed, where the extractants here also play roles of structure-directing agents and surfactants during the formation process of nanocrystals.

关键词： Ionic liquid Extraction Rare earth Luminescence

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