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Elastohydrodynamic Lubrication Interface Stiffness and Damping Considering Asperity Lateral Contact

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Acta Mechanica Solida Sinica 2024年第1期37卷 109-123页

作者： zhiqiang gao Yu Zhang Xian Wei Yanfang Zhu Lixia Peng Weiping Fu Wen Wang School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an 710048China School of Intelligent Manufacturing Panzhihua UniversityPanzhihua 617000China Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Light Chemical TechnologyYibin 644002China School of Mechanical Engineering Anyang Institute of TechnologyAnyang 455099China

Elastohydrodynamic lubrication(EHL)point contact occurs between two rough surfaces at the mesoscopic level,while the interaction of rough surfaces involves contact between asperities at the microscale *** most cases,the contact between asperities within an interface takes the form of lateral contact rather than peak *** devoid of contact asperities are filled with lubricating ***,conventional models often oversimplify lateral contact forms as interactions between asperities and a smooth,rigid *** simplifications fail to accurately represent the true contact conditions and can lead to inaccuracies in the analysis of EHL’s contact *** address this issue,we have developed a novel EHL interface model comprising two rough *** model allows us to explore the influence of asperity height,contact angle,and contact azimuth angle on EHL interface performance.

关键词： EHL interface Asperity lateral contact Contact stiffness Damping

Optimization of inter-seasonal nitrogen allocation increases yield and resource-use efficiency in a water-limited wheat-maize cropping system in the North China Plain

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The Crop Journal 2024年第3期12卷 907-914页

作者： Xiaonan Zhou Chenghang Du Haoran Li Zhencai Sun Yifei Chen zhiqiang gao Zhigan Zhao Yinghua Zhang Zhimin Wang Ying Liu College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100193China Ministerial and Provincial Co-Innovation Centre for Endemic Crops Production with High-Quality and Efficiency in Loess Plateau Taigu 030801ShanxiChina

Winter wheat–summer maize cropping system in the North China Plain often experiences droughtinduced yield reduction in the wheat season and rainwater and nitrogen(N)fertilizer losses in the maize *** study aimed to identify an optimal interseasonal water-and N-management strategy to alleviate these *** ratios of allocation of 360 kg N ha^(-1)between the wheat and maize seasons under one-time presowing root-zone irrigation(W0)and additional jointing and anthesis irrigation(W2)in wheat and one irrigation after maize sowing were set as follows:N1(120:240),N2(180:180),N3(240:120)and N4(300:60).The results showed that under W0,the N3 treatment produced the highest annual yield,crop water productivity(WPC),and nitrogen partial factor productivity(PFPN).Increased N allocation in wheat under W0 improved wheat yield without affecting maize yield,as surplus nitrate after wheat harvest was retained in the topsoil layers and available for the subsequent *** W2,annual yield was largest in the N2 *** risk of nitrate leaching increased in W2 when N application rate in wheat exceeded that of the N2 treatment,especially in the wet *** to W2N2,the W0N3 maintained 95.2%grain yield over two *** WPCwas higher in the W0 treatment than in the W2 ***,following limited total N rate,an appropriate fertilizer N transfer from maize to wheat season had the potential of a“triple win”for high annual yield,WPCand PFPN in a water-limited wheat–maize cropping system.

关键词： Cropping system Water-saving irrigation North China Plain Nitrogen optimization Sustainable intensification

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面神经功能评价

临床耳鼻咽喉头颈外科杂志 2024年第5期38卷 359-363页

作者：高志强中国医学科学院北京协和医院北京100010

面神经功能评价是面神经诊疗中至关重要的工作。面神经功能评价系统主要分为主观评价系统和客观评价系统。主观评价系统简便、应用广泛,但受评价者的主观影响,精准性欠佳。客观评价系统有更高的准确性和稳定性,能提供更多的量化信息。... 详细信息

面神经功能评价是面神经诊疗中至关重要的工作。面神经功能评价系统主要分为主观评价系统和客观评价系统。主观评价系统简便、应用广泛,但受评价者的主观影响,精准性欠佳。客观评价系统有更高的准确性和稳定性,能提供更多的量化信息。随着近年计算机视觉、人工智能等技术的快速发展,越来越精准、稳定且智能化的面神经评价系统逐渐走向临床应用。在选择具体的面神经评价系统时需综合临床场景、评价目的、患者特点等因素进行选择。

关键词：面神经功能评价人工智能

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MXene基阻燃环氧复合材料的制备及性能

工程塑料应用 2024年第1期52卷 51-58页

作者：于光徐长安高志强深圳职业技术大学深圳518055 华南农业大学生物基材料与能源教育部重点实验室广州510642 中山火炬职业技术学院广东中山528436

为提升环氧(EP)树脂的阻燃性,首先采用三聚氰胺-甲醛预聚体(MF)原位功能化MXene纳米片制备了纳米阻燃填料(MF@MXene),随后将MF@MXene加入到EP树脂中,以4,4’-二氨基二苯基甲烷为固化剂,进一步研制了MXene基阻燃环氧复合材料。使用傅里... 详细信息

为提升环氧(EP)树脂的阻燃性,首先采用三聚氰胺-甲醛预聚体(MF)原位功能化MXene纳米片制备了纳米阻燃填料(MF@MXene),随后将MF@MXene加入到EP树脂中,以4,4’-二氨基二苯基甲烷为固化剂,进一步研制了MXene基阻燃环氧复合材料。使用傅里叶变换红外光谱、扫描电子显微镜和能谱分析等手段分别表征了MXene和MF@MXene的化学结构、微观形貌和元素含量。采用拉伸试验机和锥形量热测试仪分别测试了复合材料的力学性能和阻燃性能。结果表明,MF@MXene可以显著改善MXene在环氧树脂中的分散性并提升EP复合材料的力学性能和阻燃性能。当MF@MXene的添加质量分数为2.0%时,EP复合材料的拉伸强度高达82.5 MPa,相比纯EP提升了20.2%;其热释放率峰值、总热释放量、烟雾释放率峰值和总烟雾释放量分别下降了36.99%,10.31%,25.81%,3.97%,展现出优异的力学和阻燃性能。

关键词：环氧树脂 MXene 阻燃复合材料锥形量热

High-power mode-programmable orbital angular momentum beam emitter with an internally sensed optical phased array

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Chinese Optics Letters 2024年第2期22卷 120-127页

作者：龙金虎邓宇高志强常洪祥常琦马阎星吴坚粟荣涛马鹏飞周朴 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China Hunan Provincial Key Laboratory of High Energy Laser Technology National University of Defense TechnologyChangsha 410073China

The high-power mode-programmable orbital angular momentum(OAM)beam has attracted significant attention in a wide range of applications,such as long-distance optical communication,nonlinear frequency conversion,and beam *** beam combining(CBC)of an optical phased array(OPA)can offer a promising solution for both generating the high-power OAM beam and rapidly switching the OAM ***,achieving real-time phase noise locking and formation of desired phase structures in a high-power CBC system faces significant ***,an internal phase-sensing technique was utilized to generate the high-power OAM beam,which effectively mitigated thermal effects and eliminated the need for large optical *** OPA with six elements was employed for experimental *** first effective generation of over 1.5 kW mode-programmable OAM beam in a continuous-wave domain was ***,the results demonstrated that the generated OAM beam could be modulated with multiple *** topological charge can be switched in real time from-1 ***,this OAM beam emitter could function as an OAM beam copier by easily transforming a single OAM beam into an OAM beam *** importantly,a comprehensive analysis was conducted on power scaling,mode switching speed,and expansion of OAM ***,the system’s compact design enabled it to function as a packageable OAM beam *** to the advantages of having high power and programmable modes with multiple dimension modulation in phase structures and intensity distribution,this work can pave the way for producing high-power structured light beams and advancing their applications.

关键词： orbital angular momentum optical vortex optical phased array coherent beam combining

课程思政对财务管理专业大学生意识与行为的影响

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黑龙江科学 2024年第11期15卷 97-99页

作者：高志强西安交通工程学院西安712000

为探究课程思政对财务管理专业大学生意识与行为的影响,采用问卷调研方法收集财务管理专业大学生的意识与行为等方面的信息,主成分分析表明课程思政对财务管理专业大学生的影响主要体现在价值观念、专业素养与社会责任感等方面,即课程... 详细信息

为探究课程思政对财务管理专业大学生意识与行为的影响,采用问卷调研方法收集财务管理专业大学生的意识与行为等方面的信息,主成分分析表明课程思政对财务管理专业大学生的影响主要体现在价值观念、专业素养与社会责任感等方面,即课程思政对学生的意识与行为产生了积极影响,尤其是在价值观念方面表现突出,而在提升专业素养与社会责任感方面还有进一步的发展空间。基于此,建议学校进一步完善课程思政内容与教学方法,加强课程思政与实际工作、社会实践的结合,引导学生树立正确的人生观、价值观,促进学生全面发展。

关键词：课程思政财务管理意识行为大学生

12305上材料巷沿空留巷工艺经济效益分析

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新疆钢铁 2024年第2期 147-149页

作者：高志强山东能源枣庄矿业集团柴里煤矿山东枣庄277519

长壁工作面之间一般情况下都留有一定宽度的安全煤柱,造成煤柱损失;在一定条件下,实行无煤柱开采,具有明显的经济和社会效益。某煤矿12305工作面与12304工作面之间试行无煤柱开采沿空留巷技术取得成功,实现了无煤柱开采和沿空留巷技术,... 详细信息

长壁工作面之间一般情况下都留有一定宽度的安全煤柱,造成煤柱损失;在一定条件下,实行无煤柱开采,具有明显的经济和社会效益。某煤矿12305工作面与12304工作面之间试行无煤柱开采沿空留巷技术取得成功,实现了无煤柱开采和沿空留巷技术,为后续工作面实行无煤柱开采提供了借鉴模式和经验。对此,本文通过阐述工作面沿空留巷的应用,分析比较经济效益,进而探索沿空留巷工艺的前景,以期为煤炭生产提供更有效的技术支持。

关键词：沿空留巷巷道支护经济效益

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中国术中面神经监测抽样调查

中华耳鼻咽喉头颈外科杂志 2024年第2期59卷 122-126页

作者：赵杨薛松波田旭冯国栋高志强中国医学科学院、北京协和医学院、北京协和医院耳鼻咽喉科北京100730

目的了解目前国内术中面神经监测(intraoperative facial nerve monitoring,IOFNM)应用情况及相关学科医务人员对其认识情况。方法我们于2022年10月至2023年2月采用网络问卷形式开展此现状抽样调查研究。调查范围包括国内不同地区的不... 详细信息

目的了解目前国内术中面神经监测(intraoperative facial nerve monitoring,IOFNM)应用情况及相关学科医务人员对其认识情况。方法我们于2022年10月至2023年2月采用网络问卷形式开展此现状抽样调查研究。调查范围包括国内不同地区的不同级别医务人员,涉及科室有耳鼻咽喉科、头颈外科、神经外科、口腔颌面外科。调查内容包括一般信息、IOFNM开展情况、受培训情况,以及IOFNM适应证、监测相关参数和影响条件等。结果共417名,来自31个省市自治区的213家机构的医务人员参与此次调查。共227名(54.4%,227/417)受调查者所在的53家机构(24.9%,53/213)已开展术中面神经监测。所选适应证排名前三的手术分别为听神经瘤手术、腮腺手术和修正性中耳手术(切除乳突)。已开展IOFNM的机构中81.1%(184/227)的医务人员接受过相关的培训或带教,但其中57.3%(130/227)~92.1%(209/227)对IOFNM的记录阈值、刺激电流量、刺激频率、刺激波宽等参数设置表示不清楚。结论国内尚有多数医疗机构未开展IOFNM,且不同医务人员对其认识存在差异,有必要形成相应的行业规范或者共识以促进其更好地开展和应用。

关键词：面神经监测,手术中问卷调查

On geometric interpretation of extended state observer: a preliminary study

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Control Theory and Technology 2023年第1期21卷 89-96页

作者： Jinfeng Chen zhiqiang gao Center for Advanced Control Technologies Cleveland State University2121 Euclid AvenueClevelandOH 44115USA

Borrowing the framework of the geometric approach, this paper tries to analyze and explain why it is possible for the extended state observer (ESO) to estimate the state vector and total disturbance accurately. The geometric approach has provided an elegant and rigorous framework to redefine some key concepts in modern control theory, such as controllability and observability. Moreover, those concepts can be extended to deal with systems in the presence of inaccessible disturbances, such as controlled invariants and conditioned invariants. It is shown in this paper that the augmented system of the ESO is unknown-state unknown-input completely reconstructable in finite time interval. A numerical simulation is given to verify the state vector and total disturbance can be estimated accurately by the ESO if the augmented system is unknown-state unknown-input completely reconstructable.

关键词： Extended state observer:Geometric approach-Observability Uncertain linear systems