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Surface quality investigation in high-speed dry milling of Ti-6Al-4V by using 2D ultrasonic-vibration-assisted milling platform

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Advances in Manufacturing 2024年第2期12卷 349-364页

作者： Jin Zhang li ling Qian-yue Wang Xue-Feng Huang Xin-Zhen Kang Gui-Bao Tao Hua-Jun Cao College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing400044People’s Republic of China State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing400044People’s Republic of China Aerospace Research Institute of Materials and Processing Technology Beijing100076People’s Republic of China

Ultrasonic-vibration-assisted milling(UVAM)is an advanced method for the efficient and precise machining of difficult-to-machine materials in modern ***,the milling efficiency is limited because the ultrasonic vibration toolholder ER16 collet has a critical cutting ***,a 2D UVAM platform is built to ensure precision machining efficiency and improve the surface quality without changing the milling *** evaluate this 2D UVAM platform,ultrasonic-vibration-assisted high-speed dry milling(UVAHSDM)is performed to process a titanium alloy(Ti-6Al-4V)on the platform,and the milling temperature,surface roughness,and residual stresses are selected as the important indicators for performance *** results show that the intermittent cutting mechanism of UVAHSDM combined with the specific spindle speed,feed speed,and vibration amplitude can reduce the milling temperature and improve the texture of the machined *** with conventional milling,UVAHSDM reduces surface roughness and peak-groove surface profile values and extends the range of residual surface compressive stresses from−413.96 MPa to−600.18 *** excellent processing performance demonstrates the feasibility and validity of applying this 2D UVAM platform for investigating surface quality achieved under UVAHSDM.

关键词： 2D ultrasonic-vibration-assisted milling(UVAM)platform Ultrasonic-vibration-assisted high-speed dry milling(UVAHSDM) Milling temperature Surface roughness Residual stress

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Rules-based object-relational databases ontology construction

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Journal of Systems Engineering and Electronics 2009年第1期20卷 211-215页

作者： Chen Jia Wu yue Dept. of Computer Science Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China Dept. of Electronic Engineering Univ. of California Irvine CA 92697 USA

To solve the problems of shaving and reusing information in the information system, a rules-based ontology constructing approach from object-relational databases is proposed. A 3-tuple ontology constructing model is proposed first. Then, four types of ontology constructing rules including class, property, property characteristics, and property restrictions ave formalized according to the model. Experiment results described in Web ontology language prove that our proposed approach is feasible for applying in the semantic objects project of semantic computing laboratory in UC Irvine. Our approach reduces about twenty percent constructing time compared with the ontology construction from relational databases.

关键词： ontology constructing semantic objects object-relational databases rules ontology Web ontologylanguage.

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Construction of MnS/MoS_(2) heterostructure on two-dimensional MoS_(2) surface to regulate the reaction pathways for high-performance li-O_(2) batteries

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Journal of Energy Chemistry 2024年第6期93卷 443-452,I0012页

作者： Guoliang Zhang Han Yu xia li Xiuqi Zhang Chuanxin Hou Shuhui Sun Yong Du Zhanhu Guo Feng Dang Key Laboratory for liquid-Solid Structure Evolution and.Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061ShandongChina School of Environmental and Material Engineering Yantai UniversityYantai 264005ShandongChina Institute National de la Recherche Scientifique CentreÉnergie Matériaux et TélécommunicationsVarennesQuébec J31S2Canada State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUK

The inherent catalytic anisotropy of two-dimensional(2D) materials has limited the enhancement of liO_(2) batteries(LOBs) performance due to the significantly different adsorption energies on 2D and edge *** the adsorption strength in 2D materials to the reaction intermediates is essential for achieving high-performance ***,a MnS/MoS_(2) heterostructure is designed as a cathode catalyst by adjusting the adsorption behavior at the *** from the toroidal-like discharge products on the MoS_(2) cathode,the MnS/MoS_(2) surface displays an improved adsorption energy to reaction species,thereby promoting the growth of the film-like discharge *** can disturb the layer growth of MoS_(2),in which the stack edge plane features a strong interaction with the intermediates and limits the growth of the discharge *** and theoretical results confirm that the MnS/MoS_(2) heterostructure possesses improved electron transfer kinetics at the interface and plays an important role in the adsorption process for reaction species,which finally affects the morphology of li_2O_(2),In consequence,the MnS/MoS_(2) heterostructure exhibits a high specific capacity of 11696.0 mA h g^(-1) and good cycle stability over 1800 h with a fixed specific capacity of 600 mA h g^(-1) at current density of100 mA g^(-1) This work provides a novel interfacial engineering strategy to enhance the performance of LOBs by tuning the adsorption properties of 2D materials.

关键词： li-O_(2)batteries Two-dimensional materials MnS/MoS_(2)heterostructure Edge plane Adsorption behavior

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Effect of roughness on wettability and floatability:Based on wetting film drainage between bubbles and solid surfaces

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International Journal of Mining Science and Technology 2022年第6期32卷 1389-1396页

作者： Ming li Yaowen Xing Chunyun Zhu Qinshan liu Zili Yang Rui Zhang Youfei Zhang Yangchao xia xiahui Gui Chinese National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

Wetting film thinning measurement was introduced to clarify the wettability and floatability of solid surfaces with varying roughness. The wettability was quantified using the contact angle measurement combined with the dynamic force microbalance test between solid surfaces and water droplets, while the floatability was investigated by the bubble-solid surface dynamic attachment observation and the induction time measurement. The results show that the water contact angles reduce(14.53°, 12.74°, and 6.71°)with the increase of glass surface roughness, while the water droplet-glass adhesion forces intensify(11.1, 19.1 and 19.2 μN) owing to the stable wetting film. The distortion of the contact surface and the Wenzel state are the causes. In contrast, the hydrophobized surfaces have the growing apparent contact angles(38.08°, 69.81°, and 81.01°), declining adhesion strength and shortening induction time(863, 352and 12 ms) along with the increasing surface roughness. The weak wettability and fine floatability on the rough hydrophobized surface is reflected in the fast wetting film drainage dynamics and three-phase contact formation, which may be attributed to the wetting film with short diameter on tiny rough nubs and the entrapped air in the grooves as a bridge between the bulk bubble and the solid surface.

关键词： Roughness Wetting film Wettability Floatability Flotation

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Quantifying nonclassicality of multimode bosonic fields via skew information

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Communications in Theoretical Physics 2021年第4期73卷 75-81页

作者： yue Zhang Shunlong Luo Beijing Academy of Quantum Information Sciences Beijing 100193China State Key Laboratory of Mesoscopic Physics School of PhysicsFrontiers Science Center for Nano-optoelectronicsPeking UniversityBeijing 100871China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

We quantify the nonclassicality of multimode bosonic field states by adopting an information-theoretic approach involving the Wigner-Yanase skew *** fundamental properties of the quantifier such as convexity,superadditivity,monotonicity,and conservation relations are *** quantifier is illustrated by a variety of typical examples,and applications to the quantification of nonclassical correlations are *** extensions are indicated.

关键词： Bosonic fields nonclassicality Wigner-Yanase skew information multimode states correlations

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Circumventing brittleness of 3D-printed Al_(2)O_(3)cellular ceramic structures via compositing with polyurea

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Rare Metals 2024年第11期43卷 5994-6005页

作者： Xue-Qin Zhang Ru-yue Su Xiong Gao Jing-Yi Chen Guo liu Ru-Jie He Ying li Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Department of Mechanical Engineering City University of Hong KongHongKong999077China

Benefiting from excellent mechanical properties and low density,cellular ceramic structures(CCSs)are competitive candidates as structural ***,inherent brittleness from strong chemical bonds among atoms extremely impeded CCSs'*** materials occupied outstanding strength and toughness simultaneously due to the dual-phase interpenetrated *** by natural materials,it was proposed to fabricate coating covered and fulfilled polyurea/CCS interpenetrated composites(C/CCSs and B/CCSs)to circumvent the brittleness of 3D-printed Al_(2)O_(3)*** was demonstrated that polyurea coating had less effect on the compressive strength of C/CCSs but tremendously improved their energy-absorbing *** energy-absorbing ability of C/CCSs was improved from26.48-52.57 kJ·m^(-3)of CCSs to 1.04-1.89 MJ·m^(-3)because of the extended plateau ***,compressive strength and energy-absorbing ability of B/CCSs were strengthened to 1.33-1.36 and 2.84-4.61 times of C/CCSs,***,failure mode of C/CCSs changed from localized deformation to fracturing entirely with the increase in relative density of CCSs inside,which was the same as that of ***,with the help of polyurea coating,C/CCSs were still intact at strains up to60%,which would neve r fail catastrophically as CCSs at low strains.B/CCSs tended to fracture as a whole,which was not influenced by relative density of pristine *** was believed that this work provided a creative way to circumvent the brittleness of CCSs and improve their mechanical performances.

关键词： Cellular ceramic structures Dual-phase interpenetrated composites Energy-absorbing ability Compressive strength 3D printing

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A multi-scale features-based method to detect Oplegnathus

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Information Processing in Agriculture 2021年第3期8卷 437-445页

作者： Jun yue Huihui Yang Shixiang Jia Qing Wang Zhenbo li Guangjie Kou Ruijia Ba School of Information and Electrical Engineering Ludong UniversityYantai 264025China School of Civil Engineering Ludong UniversityYantai 264025China School of Information and Electrical Engineering China Agricultrual UniversityBeijing 100083China

It is of great significance to use underwater video and image processing technology to detect and analyze fish *** this paper,an Oplegnathus image dataset for fish behaviors study by deep learning algorithm is constructed,and the data is captured from two cameras(one above water and another below water);and then an improved Neural Network model based on multi-scale features is proposed for fish behaviors learning *** overcome the occlusion and blur problems of the images,the lightweight neu-ral network MobileNet-SSD is improved by adding a dilate convolution,and SE blocks are added to the feature maps at different scales to establish a self-attention mechanism;the Focal Loss function is used to calculate the classification loss and to balance the propor-tion of background and target *** results of the experiments show that the aver-age behaviors detection accuracy of our method reach 90.94%and 88.36%in both overwater and underwater datasets.

关键词： Detection of the Oplegnathus Deep learning MobileNet-SSD Neural networks

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High efficiency removal of NO using waste calcium carbide slag by facile KOH modification

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Journal of Environmental Sciences 2024年第5期139卷 182-192页

作者： Fang Wang Hui li Jiyun Gao Na Geng Enzhu Jiang Futing xia Mingwu xiang lijuan Jia Ping Ning School of Chemistry and Environment Yunnan Minzu UniversityKunming 650504China Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China

Waste calcium carbide slags(CS),which are widely applied to desulfurisation,are not typically used in ***,to well achieve waste control by waste,a facile and highefficiency denitration strategy is developed using KOH to modify the calcium carbide slags(KCS).Various KCS samples were investigated using a series of physical and chemical *** performance test results showed that the KOH concentration and reaction temperature are the main factors affecting the denitration efficiency of KCS,and CS modified with 1.5 mol/L KOH(KCS-1.5)can achieve 100% denitration efficiency at 300℃.Such excellent removal efficiency is due to the catalytic oxidation of the oxygen-containing functional groups derived from the *** studies showed that KOH treatment significantly increased the concentration of oxygen vacancies,nitro compounds,and basic sites of *** study provides a novel strategy for the resource utilisation of waste CS in the future.

关键词： Waste Carbide slag KOH Effective denitration

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Prediction calculations for the first criticality of the HTR-PM using the PANGU code

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Nuclear Science and Techniques 2021年第9期32卷 9-15页

作者： Ding She Bing xia Jiong Guo Chun-lin Wei Jian Zhang Fu li Lei Shi Zuo-Yi Zhang Institute of Nuclear and New Energy Technology(INET) Tsinghua UniversityBeijing 100084China

The high-temperature reactor pebble-bed mod-ule(HTR-PM)is a modular high-temperature gas-cooled reactor demonstration power *** first criticality experiment is scheduled for the latter half of *** performing the first criticality experiment,a prediction calculation was performed using PANGU *** paper presents the calculation details for predicting the HTR-PM first criticality using PANGU,including the input model and parameters,numerical results,and uncertainty *** accuracy of the PANGU code was demonstrated by comparing it with the high-fidelity Monte Carlo solution,using the same input *** should be noted that k eff can be significantly affected by uncertainties in nuclear data and certain input parameters,making the criticality calculation ***,the PANGU is used to pre-dict the critical loading height of the HTR-PM first criti-cality under design conditions,which will be evaluated in the upcoming experiment later this year.

关键词： HTR-PM First criticality Prediction PANGU

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Cluster Structure in Be Isotopes within Point-Coupling Covariant Density Functional

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Chinese Physics Letters 2013年第1期30卷 52-55页

作者： TANG Zhong-Hua li Jia-Xing JI Juan-xia ZHOU Tao School of Physical Science and Technology Southwest UniversityChongqing 400715

The potential energy surfaces and density distributions of ground states in even-mass Be isotopes are studied by using the point-coupling covariant density functional theory with the PC-F1 effective *** clustering structure is exhibited automatically in most of the Be *** results indicate that ^(6)Be has an α+2p clustering structure,while ^(8,10,14)Be have the 2αclustering ***α–αdistances and the corresponding quadrupole deformation parameters have a similar evolution trend against the neutron number.

关键词： interaction. structure. number.

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