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Analysis of grinding mechanics and improved grinding force model based on randomized grain geometric characteristics

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Chinese Journal of Aeronautics 2023年第7期36卷 160-193页

作者： Mingzheng LIU Changhe LI Yanbin ZHANG Min YANG Teng GAO Xin CUI Xiaoming WANG wenhao xu Zongming ZHOU Bo LIU Zafar SAID Runze LI Shubham SHARMA School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China Hanergy(Qingdao)Lubrication Technology Co. LTDQingdao 266520China Sichuan Future Aerospace Industry LLC Shifang 618400China Department of Sustainable and Renewable Energy Engineering University of SharjahSharjah 27272United Arab Emirates Department of Biomedical Engineering University of Southern CaliforniaLos AngelesCA 90089–1111USA Department of Mechanical Engineering I.K.Gujral Punjab Technical UniversityJalandhar 144603India

Too high grinding force will lead to a large increase in specific grinding energy, resulting in high temperature in grinding zone, especially for the aerospace difficult cutting metal materials,seriously affecting the surface quality and accuracy. At present, the theoretical models of grinding force are mostly based on the assumption of uniform or simplified morphological characteristics of grains, which is inconsistent with the actual grains. Especially for non-engineering grinding wheel,most geometric characteristics of grains are ignored, resulting in the calculation accuracy that cannot guide practical production. Based on this, an improved grinding force model based on random grain geometric characteristics is proposed in this paper. Firstly, the surface topography model of CBN grinding wheel is established, and the effective grain determination mechanism in grinding zone is revealed. Based on the known grinding force model and mechanical behavior of interaction between grains and workpiece in different stages, the concept of grain effective action area is proposed. The variation mechanism of effective action area under the influence of grain geometric and spatial characteristics is deeply analyzed, and the calculation method under random combination of five influencing parameters is obtained. The numerical simulation is carried out to reveal the dynamic variation process of grinding force in grinding zone. In order to verify the theoretical model, the experiments of dry grinding Ti-6Al-4 V are designed. The experimental results show that under different machining parameters, the results of numerical calculation and experimental measurement are in good agreement, and the minimum error value is only 2.1 %, which indicates that the calculation accuracy of grinding force model meets the requirements and is feasible. This study will provide a theoretical basis for optimizing the wheel structure, effectively controlling the grinding force range, adjusting the grindi

关键词： Effective action area Grinding force Improved model Mechanical behaviour Randomized grain

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RiceENCODE:A comprehensive epigenomicdatabase as a rice Encyclopedia of DNA Elements

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Molecular Plant 2021年第10期14卷 1604-1606页

作者： Liang Xie Minghao Liu Lun Zhao Kai Cao Peng Wang wenhao xu Wing-Kin Sung Xingwang Li Guoliang Li National Key Laboratory of Crop Genetic Improvement Hubei HongshanLaboratoryHuazhong Agricultural University1 Shizishan StreetHongshanDistrictWuhan 430070HubeiChina Agricultural Bioinformatics Key Laboratory of Hubei Province and HubeiEngineering Technology Research Center of Agricultural Big Data 3DGenomics Research CenterHuazhong Agricultural University1 ShizishanStreetHongshan DistrictWuhan 430070HubeiChina Department of Computer Science National University of SingaporeSingapore 117417Singapore Department of Computational and Systems Biology Genome Institute ofSingaporeSingapore 138672Singapore

Dear Editor,Rice(Oryza sativa)is one of the most important crops in the worldand a common model plant for genomic *** genomesofXian/IndicaandGeng/Japonicahave been completelysequenced and annotated with accurate genome *** the past few years,epigenomic information,including DNAmethylation,histone modification,and chromatin accessibility,has been characterized in theXian/IndicaandGeng/Japonicage-nomes(Zhao et al.,2020).Quite a few rice three-dimensionalgenome studies have been published in the meantime(Zhaoet al.,2019).However,it is still a big challenge for many groupsthat lack dedicated bioinformatic personnel or sufficientcomputational resources to utilize such epigenetic data.

关键词： sativa Oryza crops

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达芬奇机器人辅助最大程度保留周围结构的前列腺癌根治术的临床研究

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重庆医学 2024年第18期53卷 2776-2780页

作者：徐文浩刘良邓旻朱景振李思月陈宇吴清剑郑霁陆军军医大学第二附属医院泌尿外科中心重庆400037 保定市第一中心医院泌尿外一科河北保定071000

目的观察最大程度保留前列腺周围结构的前列腺癌根治术(MS-RARP)后功能恢复情况。方法选取2019年6月至2022年6月于陆军军医大学第二附属医院行MS-RARP治疗的67例局限性前列腺癌患者为研究对象,比较术前与术后6周、3个月、6个月和12个月... 详细信息

目的观察最大程度保留前列腺周围结构的前列腺癌根治术(MS-RARP)后功能恢复情况。方法选取2019年6月至2022年6月于陆军军医大学第二附属医院行MS-RARP治疗的67例局限性前列腺癌患者为研究对象,比较术前与术后6周、3个月、6个月和12个月时的尿控功能、勃起功能、生活质量、总前列腺特异性抗原(t-PSA)改变情况。采用扩展前列腺癌指数综合指数(EPIC-50)评价患者的尿控功能,国际勃起功能指数(IIEF-5)问卷评估患者的勃起功能,采用EPIC-50和美国泌尿系统评分系统(AUA-SS)评估患者生活满意情况。结果MS-RARP患者术后6周、3个月、6个月和12个月尿控功能恢复率、勃起功能恢复率、生活质量满意率逐渐提高,分别为71.8%、95.5%、97.3%、98.1%,31.7%、38.1%、41.3%、44.4%,38.9%、83.6%、88.1%、97.0%,t-PSA逐渐降低,分别为0.026(0.010,0.410)、0.009(0.003,0.060)、0.006(0.001,0.050)和0.004(0.001,0.006)ng/mL。术后各时间点生活质量满意率较术前均明显升高(P<0.05),t-PSA较术前均明显下降(P<0.05)。结论RARP可以很好地保护患者术后尿控功能、性功能,提高患者术后生活质量。

关键词：达芬奇机器人最大程度保留周围结构前列腺癌根治术

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Electrostatic atomization minimum quantity lubrication machining:from mechanism to application

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International Journal of Extreme Manufacturing 2022年第4期4卷 58-100页

作者： wenhao xu Changhe Li Yanbin Zhang Hafiz Muhammad Ali Shubham Sharma Runze Li Min Yang Teng Gao Mingzheng Liu Xiaoming Wang Zafar Said Xin Liu Zongming Zhou School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520People's Republic of China State Key Laboratory of Ultra-Precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong KongPeople's Republic of China Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Department of Mechanical Engineering IK Gujral Punjab Technical UniversityPunjab 144603India Department of Biomedical Engineering University of Southern CaliforniaLos AngelesCA 90089-1111United States of America College of Engineering University of SharjahSharjah 27272United Arab Emirates School of Mechanical Engineering Dalian University of TechnologyDalian 116024People's Republic of China Hanergy(Qingdao)Lubrication Technology Co.LTD Qingdao 266520People's Republic of China

Metal cutting fluids(MCFs)under flood conditions do not meet the urgent needs of reducing carbon ***-based minimum quantity lubrication(MQL)is an effective alternative to flood ***,pneumatic atomization MQL has poor atomization properties,which is detrimental to occupational ***,electrostatic atomization MQL requires preliminary exploratory ***,systematic reviews are lacking in terms of capturing the current research status and development direction of this *** study aims to provide a comprehensive review and critical assessment of the existing understanding of electrostatic atomization *** research can be used by scientists to gain insights into the action mechanism,theoretical basis,machining performance,and development direction of this ***,the critical equipment,eco-friendly atomization media(biolubricants),and empowering mechanisms of electrostatic atomization MQL are ***,the advanced lubrication and heat transfer mechanisms of biolubricants are revealed by quantitatively comparing MQL with MCF-based wet ***,the distinctive wetting and infiltration mechanisms of electrostatic atomization MQL,combined with its unique empowering mechanism and atomization method,are compared with those of pneumatic atomization *** experiments have shown that electrostatic atomization MQL can reduce tool wear by 42.4%in metal cutting and improve the machined surface Ra by 47%compared with pneumatic atomization ***,future development directions,including the improvement of the coordination parameters and equipment integration aspects,are proposed.

关键词： cutting grinding minimum quantity lubrication electrostatic atomization biolubricant

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Carbon nanocages bridged with graphene enable fast kinetics for dual-carbon lithium-ion capacitors

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Green Energy & Environment 2024年第3期9卷 573-583页

作者： Shani Li Yanan xu wenhao Liu xudong Zhang Yibo Ma Qifan Peng Xiong Zhang Xianzhong Sun Kai Wang Yanwei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Innovation Academy for Green Manufacture Beijing100190China Beijing Institute of Technology Beijing100081China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Lithium-ion capacitors(LICs) combining the advantages of lithium-ion batteries and supercapacitors are considered a promising nextgeneration energy storage device. However, the sluggish kinetics of battery-type anode cannot match the capacitor-type cathode, restricting the development of LICs. Herein, hierarchical carbon framework(HCF) anode material composed of 0D carbon nanocage bridged with 2D graphene network are developed via a template-confined synthesis process. The HCF with nanocage structure reduces the Li^(+) transport path and benefits the rapid Li^(+) migration, while 2D graphene network can promote the electron interconnecting of carbon nanocages. In addition, the doped N atoms in HCF facilitate to the adsorption of ions and enhance the pseudo contribution, thus accelerate the kinetics of the anode. The HCF anode delivers high specific capacity, remarkable rate capability. The LIC pouch-cell based on HCF anode and active HCF(a-HCF) cathode can provide a high energy density of 162 Wh kg^(-1) and a superior power density of 15.8 kW kg^(-1), as well as a long cycling life exceeding 15,000cycles. This study demonstrates that the well-defined design of hierarchical carbon framework by incorporating 0D carbon nanocages and 2D graphene network is an effective strategy to promote LIC anode kinetics and hence boost the LIC electrochemical performance.

关键词： Hierarchical carbon framework Nanocage ZIF Graphene Lithium-ion capacitors

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Functional near-infrared spectroscopy in non-invasive neuromodulation

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Neural Regeneration Research 2024年第7期19卷 1517-1522页

作者： Congcong Huo Gongcheng xu Hui Xie Tiandi Chen Guangjian Shao Jue Wang wenhao Li Daifa Wang Zengyong Li Beijing Advanced Innovation Center for Biomedical Engineering Key Laboratory for Biomechanics and Mechanobiology of Ministry of EducationSchool of Biological Science and Medical EngineeringBeihang UniversityBeijingChina Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age Disability National Research Center for Rehabilitation Technical AidsBeijingChina School of Mechatronic Engineering and Automation Foshan UniversityFoshanGuangdong ProvinceChina School of Rehabilitation Engineering Beijing College of Social AdministrationBeijingChina Key Laboratory of Neuro-functional Information and Rehabilitation Engineering of the Ministry of Civil Affairs BeijingChina

Non-invasive cerebral neuromodulation technologies are essential for the reorganization of cerebral neural networks,which have been widely applied in the field of central neurological diseases,such as stroke,Parkinson’s disease,and mental *** significant advances have been made in neuromodulation technologies,the identification of optimal neurostimulation paramete rs including the co rtical target,duration,and inhibition or excitation pattern is still limited due to the lack of guidance for neural *** r,the neural mechanism unde rlying neuromodulation for improved behavioral performance remains poorly ***,advancements in neuroimaging have provided insight into neuromodulation *** near-infrared spectroscopy,as a novel non-invasive optical brain imaging method,can detect brain activity by measuring cerebral hemodynamics with the advantages of portability,high motion tole rance,and anti-electromagnetic *** functional near-infra red spectroscopy with neuromodulation technologies offe rs an opportunity to monitor the cortical response,provide realtime feedbac k,and establish a closed-loop strategy integrating evaluation,feedbac k,and intervention for neurostimulation,which provides a theoretical basis for development of individualized precise neuro *** aimed to summarize the advantages of functional near-infra red spectroscopy and provide an ove rview of the current research on functional near-infrared spectroscopy in transcranial magnetic stimulation,transcranial electrical stimulation,neurofeedback,and braincomputer ***,the future perspectives and directions for the application of functional near-infrared spectroscopy in neuromodulation are *** conclusion,functional near-infrared spectroscopy combined with neuromodulation may promote the optimization of central pellral reorganization to achieve better functional recovery form central nervous system

关键词： brain-computer interface cerebral neural networks functional near-infrared spectroscopy neural circuit neurofeedback neurological diseases neuromodulation non-invasive brain stimulation transcranial electrical stimulation transcranial electrical stimulation

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Intensive management enhances mycorrhizal respiration but decreases free-living microbial respiration by affecting microbial abundance and community structure in Moso bamboo forest soils

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Pedosphere 2024年第2期34卷 508-519页

作者： wenhao JIN Jiangfei GE Shuai SHAO Liyuan PENG Jiajia XING Chenfei LIANG Junhui CHEN Qiufang xu Hua QIN State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China School of Environmental and Resource Sciences Zhejiang A&F UniversityHangzhou 311300China

Intensive management is known to markedly alter soil carbon(C)storage and turnover in Moso bamboo forests compared with extensive ***,the effects of intensive management on soil respiration(RS)components remain *** study aimed to evaluate the changes in different RScomponents(root,mycorrhizal,and free-living microorganism respiration)in Moso bamboo forests under extensive and intensive management practices.A1-year in-situ microcosm experiment was conducted to quantify the RScomponents in Moso bamboo forests under the two management practices using mesh screens of varying *** results showed that the total RSand its components exhibited similar seasonal variability between the two management *** with extensive management,intensive management significantly increased cumulative respiration from mycorrhizal fungi by 36.73%,while decreased cumulative respiration from free-living soil microorganisms by 8.97%.Moreover,the abundance of arbuscular mycorrhizal fungi(AMF)increased by 43.38%,but bacterial and fungal abundances decreased by 21.65%and 33.30%,respectively,under intensive *** management practices significantly changed the bacterial community composition,which could be mainly explained by soil pH and available *** fungi and intensive management affected the interrelationships between bacterial *** equation modeling indicated that intensive management changed the cumulative RSby elevating AMF abundance and lowering bacterial *** concluded that intensive management reduced the microbial respiration-derived C loss,but increased mycorrhizal respiration-derived C loss.

关键词： arbuscular mycorrhizal fungi extensive management microbial co-occurrence network root respiration soil organic C soil respiration structural equation model

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Systematic Genome-Wide Profiles Reveal Alternative Splicing Landscape and Implications of Splicing Regulator DExD-Box Helicase 21 in Aggressive Progression of Adrenocortical Carcinoma

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Phenomics 2021年第6期1卷 243-256页

作者： wenhao xu Aihetaimujiang Anwaier Wangrui Liu Xi Tian Wen-Kai Zhu Jian Wang Yuanyuan Qu Hailiang Zhang Dingwei Ye Department of Urology Fudan University Shanghai Cancer CenterNo.270 Dong’an RoadShanghai 200032People’s Republic of China Department of Oncology Shanghai Medical CollegeFudan UniversityShanghai 200032People’s Republic of China Department of Transplantation Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092People’s Republic of China

Alternative splicing(AS)in the tumor biological process has provided a novel perspective on ***,the clinical significance of individual AS patterns of adrenocortical carcinoma(ACC)has been underestimated,and in-depth investigations are *** selected 76 ACC samples from the Cancer Genome Atlas(TCGA)SpliceSeq and SpliceAid2 databases,and 39 ACC samples from Fudan University Shanghai Cancer Center(FUSCC).Prognosis-related AS events(PASEs)and survival analysis were evaluated based on prediction models constructed by machine-learning *** total,23,984 AS events and 3,614 PASEs were detected in the patients with *** predicted risk score of each patient suggested that eight PASEs groups were significantly correlated with the clinical outcomes of these patients(p<0.001).Prognostic models produced AUC values of 0.907 in all PASEs’*** splicing factors(SFs),including BAG2,CXorf56,DExD-Box Helicase 21(DDX21),HSPB1,MBNL3,MSI1,RBMXL2,and SEC31B,were identified in regulatory networks of ***21 was identified and validated as a novel clinical promoter and therapeutic target in 115 patients with ACC from TCGA and FUSCC *** conclusion,the strict standards used in this study ensured the systematic discovery of profiles of AS events using genome-wide *** findings contribute to a comprehensive understanding of the landscape and underlying mechanism of AS,providing valuable insights into the potential usages of DDX21 for predict-ing prognosis for patients with ACC.

关键词： Adrenocortical carcinoma Genome-wide analysis Prognosis Alternative splicing Bioinformatics DExD-Box Helicase 21(DDX21)

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Mg/Fe site-specific dual-doping to boost the performance of cobalt-free nickle-rich layered oxide cathode for high-energy lithium-ion batteries

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Journal of Energy Chemistry 2024年第4期91卷 670-679页

作者： Yunting Wang Gaohui Du Di Han wenhao Shi Jiahao Deng Huayu Li Wenqi Zhao Shukai Ding Qingmei Su Bingshe xu Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi'an 710021ShanxiChina Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Layer-type LiNi0.9Mn0.1O2is promising to be the primary cathode material for lithium-ion batteries(LIBs)due to its excellent electrochemical ***,the cathode with high nickel content suffers from severely detrimental structural transformation that causes rapid capacity ***,site-specific dual-doping with Fe and Mg ions is proposed to enhance the structural stability of *** Fe3+dopants are inserted into transition metal sites(3b)and can favorably provide additional redox potential to compensate for charge and enhance the reversibility of anionic *** Mg ions are doped into the Li sites(3a)and serve as O_(2)^(-)-Mg^(2+)-O_(2)^(-)pillar to reinforce the electrostatic cohesion between the two adjacent transition-metal layers,which further suppress the cracking and the generation of harmful phase transitions,ultimately improving the *** theoretical calculations,including Bader charge and crystal orbital Hamilton populations(COHP)analyses,confirm that the doped Fe and Mg can form stable bonds with oxygen and the electrostatic repulsion of O_(2)^(-)-O_(2)^(-)can be effectively suppressed,which effectively mitigates oxygen anion loss at the high delithiation *** dual-site doping strategy offers new avenues for understanding and regulating the crystalline oxygen redox and demonstrates significant potential for designing high-performance cobalt-free nickel-rich cathodes.

关键词： Cobalt-free Layered oxide Cathode Dual dopants Density functional theory calculation

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TC4/30CrMnSiNi2A钎焊接头组织与力学性能分析

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稀有金属材料与工程 2019年第9期48卷 3035-3040页

作者：岳喜山谢宗蕻徐文豪西北工业大学陕西西安710072 中国航空制造技术研究院航空焊接与连接技术航空科技重点实验室北京100024

采用Ti-37.5Zr-15Cu-10Ni和Ag-Cu28两种钎料分别对TC4钛合金/30CrMnSiNi2超高强钢异种材料进行了钎焊,对钎焊界面组织以及接头的力学性能进行了分析。结果表明:Ag基钎料钎焊TC4与30CrMnSiNi2A异种材料时,钎缝界面组织为Ag(s,s)+Ti-Cu系... 详细信息

采用Ti-37.5Zr-15Cu-10Ni和Ag-Cu28两种钎料分别对TC4钛合金/30CrMnSiNi2超高强钢异种材料进行了钎焊,对钎焊界面组织以及接头的力学性能进行了分析。结果表明:Ag基钎料钎焊TC4与30CrMnSiNi2A异种材料时,钎缝界面组织为Ag(s,s)+Ti-Cu系化合物组成;因Ag固溶体的存在,钎缝具有一定的韧性,接头剪切强度较高,剪切断口呈现出韧性断裂特征。Ti基钎料钎焊TC4与30CrMnSiNi2A异种材料时,钎缝界面组织为Ti-Zr固溶体+未完全反应凝固钎料,钎缝显微硬度较高,接头剪切强度较低,呈现出脆性断裂特征。Ag基钎料TC4/30CrMnSiNi2A异种材料钎焊接头力学性能明显优于Ti基钎料结果,在钎焊温度830℃,保温时间15 min时,抗剪切强度为125.52 MPa。

关键词： TC4钛合金 30CrMnSiNi2超高强钢钎焊组织力学性能

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