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Mechanical behavior of 2G NPR bolt anchored rock samples under static disturbance loading

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Journal of Mountain Science 2024年第7期21卷 2494-2516页

作者： wang Jiong JIANG Jian wang siyu CHANG Yiwen LIU Peng HE Manchao CHENG Shuang State Key Laboratory for Tunnel Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China

The deep mining of coal resources is accompanied by severe environmental challenges and various potential engineering *** implementation of NPR(negative Poisson's ratio)bolts are capable of controlling large deformations in the surrounding rock *** paper focuses on studying the mechanical properties of the NPR bolt under static disturbance *** deep nonlinear mechanical experimental system was used to study the mechanical behavior of rock samples with different anchored types(unanchored/PR anchored/2G NPR anchored)under static disturbance *** whole process of rock samples was taken by high-speed camera to obtain the real-time failure characteristics under static disturbance *** the same time,the acoustic emission signal was collected to obtain the key characteristic parameters of acoustic emission such as acoustic emission count,energy,and *** deformation at the failure of the samples was calculated and analyzed by digital speckle *** findings indicate that the failure mode of rock is influenced by different types of *** peak failure strength of 2G NPR bolt anchored rock samples exhibits an increase of 6.5%when compared to the unanchored rock *** cumulative count and cumulative energy of acoustic emission exhibit a decrease of 62.16%and 62.90%,*** maximum deformation of bearing capacity exhibits an increase of 59.27%,while the failure time demonstrates a delay of 42.86%.The peak failure strength of the 2G NPR bolt anchored ones under static disturbance load exhibits an increase of 5.94%when compared to the rock anchored by PR(Poisson's ratio)*** cumulative count and cumulative energy of acoustic emission exhibit a decrease of 47.16%and 43.86%,*** maximum deformation of the bearing capacity exhibits an increase of 50.43%,and the failure time demonstrates a delay of 32%.After anchoring by 2G NPR bolt,anchoring support effectively reduces the risk of damage caused by s

关键词： Anchored rock samples Static disturbance load Acoustic emission characteristics Digital speckle Negative Poisson's ratio

Supporting factors model for the sustainable step development of supply chain:An empirical study from China with grounded theory

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Frontiers of Engineering Management 2024年第2期11卷 311-325页

作者： Xiaohong CHEN Chunfang LU Weihua LIU siyu wang Shangsong LONG Jingcheng QIU Yujie wang Hunan University of Commerce Changsha 410205China Chinese Academy of Engineering Beijing 100088China College of Management and Economics Tianjin UniversityTianjin 300072China

The ongoing stability of supply chains faces significant challenges from trade protectionism,anti-globalization trends,and the COVID-19 *** remain resilient in this dynamic market environment,supply chains must evolve through iterative upgrades and transition to a higher level of sustainability,a process termed“step development.”The current literature,however,offers limited insights into achieving such step development in supply chain sustainability and its critical supporting *** study,grounded in theory,involved interviews with representatives from eight diverse Chinese *** introduce a model delineating supporting factors and a roadmap for Sustainable Step Development of Supply Chains(SSDSC).Our findings highlight three pivotal categories of support for SSDSC:institutional,technological,and social ***,we observed that external influences in these categories positively modulate their internal *** study identifies industrial technology,digital intelligence technology,corporate responsibility,and stakeholder needs as key elements in this *** conclude by offering theoretical and practical recommendations to foster SSDSC.

关键词： supply chain sustainable development supporting factors grounded theory

Nonstandard limit theorems and large deviation for β-Jacobi ensembles with a different scaling

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Acta Mathematica Sinica,English Series 2024年

作者： Yutao MA Yong-Hua MAO siyu wang School of Mathematical Sciences Beijing Normal University

We consider β-Jacobi ensembles with parameters p1, p2≥n. We prove that the empirical measure of the rescaled Jacobi ensembles converges weakly to a modified Watcher law via the spectral measure method. We also provide the central limit theorem and the large deviation for the corresponding rescaled spectral measure.

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A novel semi-dominant allele of the transmembrane NAC transcription factor ZmNTL2 reduces the size of multiple maize organs

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The Crop Journal 2024年第3期12卷 676-687页

作者： Chuan Li Yun Bai Yuwei Hou siyu wang Yue Xin Tao Yu Jing wang Xiaowei Liu Hongyang Yi Chao Xia Hai Lan Moju Cao State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Maize Research InstituteSichuan Agricultural UniversityChengdu 611130SichuanChina Jilin Engineering Research Center for Crop Biotechnology Breeding College of Plant ScienceJilin UniversityChangchun 130012JilinChina

Maize plant architecture influences planting density and,in turn,grain *** of the plant architecture-related traits can be described as organ *** describe a miniature maize mutant,Tiny plant 4(Tip4),which exhibits reduced size of multiple organs and exhibits a semi-dominant monofactorial inheritance *** cloning confirmed that a 4-bp deletion in the NAC TF with transmembrane motif 1-Like(NTL)gene ZmNTL2,denoted as ZmNTL2^(Δ),confers the Tip4 ***-PCR showed that ZmNTL2 was expressed in all tested ***2 functions as a transcriptional activator and is located in both the nucleus and *** mutation does not affect the mRNA abundance of ZmNTL2 locus,but it does result in the loss of transmembrane domain and confines the ZmNTL2^(Δ)protein to the *** out ZmNTL2 has no effect on maize organ size development,indicating that the 4-bp deletion might be a gain-of-function mutation in organ size *** transcriptome sequencing with cytokinin and auxin content determination suggests that the decreased organ size may be possibly mediated by changes in hormone homeostasis.

关键词： Organ size c-ray mutagenesis Membrane-bound NAC TF Hormone homeostasis Maize

Response of warm season secondary pollutants to emissions and meteorology in the North China Plain region during 2018-2022

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Atmospheric and Oceanic Science Letters 2024年第4期17卷 58-64页

作者： Yueqi Gao siyu wang Zhaolei Zhang Wenxuan Yu Shuai wang Shengqiang Zhu Peng wang Yan Li Yele Sun Hongliang Zhang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science&EngineeringFudan UniversityShanghaiChina Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghaiChina Shanghai Key Laboratory of Ocean-land-atmosphere Boundary Dynamics and Climate Change ShanghaiChina IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghaiChina State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina Institute of Eco-Chongming ShanghaiChina

自2013年起中国空气质量虽改善,但华北平原(NCP)重污染仍存在且二次污染加剧,而人们对其成因和变化了解有限.本研究利用2018-2022年数据,借助CMAQ模型探讨此污染响应.结果显示,在2018-2022年间,PM_(2.5)浓度显著下降31%-37%,O_(3)和NO_... 详细信息

自2013年起中国空气质量虽改善,但华北平原(NCP)重污染仍存在且二次污染加剧,而人们对其成因和变化了解有限.本研究利用2018-2022年数据,借助CMAQ模型探讨此污染响应.结果显示,在2018-2022年间,PM_(2.5)浓度显著下降31%-37%,O_(3)和NO_(2)的年下降速率分别为1%和0.5%SIA和SOA也显著减少,每年分别减少9%和6%PM_(2.5)主要因排放减少而下降,而O_(3)则受气象影响而波动.硫酸盐和铵下降的主因是减排,而硝酸盐对气象变化敏感排放和气象变化对SOA的总体减少同样重要,但人为SOA对排放控制敏感生物SOA易受气象变化影响.研究强调了控制人为排放对缓解NCP地区夏季二次污染的重要性.

关键词： PM_(2.5) 二次污染物人为排放气象华北平原

Ethnic Customs and Rural Tourism Development in Xinbin Manchu Autonomous County of Fushun City

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Asian Agricultural Research 2024年第5期16卷 8-10页

作者： siyu wang Liang ZHAO School of Business Administration University of Science and Technology LiaoningAnshan 114051China

The development of ethnic minority tourism is currently a hot topic in domestic tourism *** an important component of Chinese civilization,the Manchu people have created brilliant culture in the long river of historical *** the hometown of the Manchu people,Fushun has unique folk cultural tourism resources and a strong ethnic ***,under the promotion of the rural revitalization strategy,the construction of new rural areas is constantly developing,and rural tourism is gradually becoming a new ***,in the context of the increasingly prosperous rural tourism industry,it has become increasingly important to combine the ethnic customs of Manchu culture with rural *** the ethnic customs and integrated development of rural tourism in Xinbin Manchu Autonomous County of Fushun City,Liaoning Province as the research object,this paper mainly sorts out the current situation and characteristics of rural tourism development in the region,systematically explores the problems in development and how to further optimize development,and proposes new models suitable for the development of folk tourism in Xinbin of Fushun,in order to achieve maximum economic and social benefits and provide a reference for promoting the development of tourism in the region.

关键词： Xinbin Manchu Autonomous County Manchu ethnic customs Rural revitalization Rural tourism development

Wireless measurement of orthodontic forces in invisible aligners

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Medicine in Novel Technology and Devices 2024年第1期21卷 64-70页

作者： siyu wang Bingxin Xu Xiaokang wang Xinfang Li Bangzheng Pu Gui Chen Jianmin Han Shengzhao Xiao Yubo Fan Jiebo Li Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationInstitute of Medical PhotonicsBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100191China Department of Orthodontics Peking University School and Hospital of Stomatology&.National Clinical Research Center for Oral Diseases&.National Engineering Laboratory for Digital and Material Technology of Stomatology&.Beijing Key Laboratory of Digital Stomatology&.Research Center of Engineering and Technology for Computerized Dentistry Ministry of HealthBeijing100081China Department of Dental Materials Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental MaterialsBeijing100081China Department of Orthodontics Shanghai Ninth People's HospitalCollage of StomatologyShanghai Jiao Tong University School of MedicineNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology&Shanghai Research Institute of StomatologyShanghaiChina

Invisible orthodontic treatment is an effective form of malocclusion treatment favored in recent *** magnitude of its orthodontic force has a crucial impact on the outcome of the treatment and has gained a high level of clinical ***,there are very few explorations of in vivo measurements of orthodontic force,and existing studies are limited to a large number of couplings,which are inconvenient for clinical *** this work,we developed a wireless flexible measurement system that allows quantitative measurement of the orthodontic force of an invisible aligner on a dental *** system is wireless,tiny,flexible,fast responding,and has a range suitable for the range of orthodontic *** show the difference in the orthodontic force applied to different tooth positions and the difference in the orthodontic force applied to different positions of the same *** addition,the system can evaluate the mechanical differences between aligners of different brands and materials as well as the deviation of fabrication *** system provides a test tool and evaluation method for future real-time assessment of clinical orthodontic forces.

关键词： Orthodontic forces Wireless measurement systems Flexible sensors Invisible orthodontics Performance evaluation Quantitative measurements

非传统安全挑战下的准军事力量安全角色重塑——基于土耳其、波兰和乌克兰的比较分析

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国际展望 2024年第2期16卷 141-160,166页

作者：王思羽上海外国语大学上海全球治理与区域国别研究院上海201620

准军事力量是民族国家概念与西方现代军事制度的早期实践产物,是一种在组织结构、文化甚至职能上与军队类似的半军事化力量,并拥有显著的政治属性。19世纪至20世纪初期的脆弱民族国家雏体和激进的民族主义,共同拓展了非正规武力的使用... 详细信息

准军事力量是民族国家概念与西方现代军事制度的早期实践产物,是一种在组织结构、文化甚至职能上与军队类似的半军事化力量,并拥有显著的政治属性。19世纪至20世纪初期的脆弱民族国家雏体和激进的民族主义,共同拓展了非正规武力的使用空间和暴力的道德尺度,强化了军事精英群体在国家政治生活与议程中的影响与作用。这构成了一种准军事主义的社会性文化土壤,直至冷战末期都被镌刻并保留在一些国家的制度记忆与民族身份的象征符号中。21世纪全球性非传统安全挑战的上升推动了不同国家安全战略的调整,使准军事力量获得了新的安全角色转型契机。通过对土耳其、波兰和乌克兰不同准军事力量的形成、演变和当代角色调整的比较,可以发现三国的准军事力量的模糊性在制度和规范影响下弱化,且在军队与警察之间获得更清晰的角色定位,并从原先的文化产物转变为制度产物。

关键词：准军事力量非传统安全乌克兰波兰土耳其

Quantitative analysis of the morphing wing mechanism of raptors: Analysis methods, folding motions, and bionic design of Falco Peregrinus

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Fundamental Research 2024年第2期4卷 344-352页

作者： Di Tang Xipeng Huang Jinqi Che Weijie Jin Yahui Cui Yangjun Chen Yuxiao Yuan Zhongyong Fan Weiwei Lu siyu wang Yin Yang Dawei Liu College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310014China Affiliated HangZhou XiXi hospital Zhejiang University School of MedicineHangzhou 310023China Zhejiang Museum of Natural History Hangzhou 310014China High Speed Aerodynamic Institute China Aerodynamics Research and Development CenterMianyang 621000China

Raptors can change the shape and area of their wings to an exceptional degree in a fast and efficient manner,surpassing other birds,insects,or *** researchers have focused on the functional properties of muscle skeletons,mechanics,and flapping robot ***,the wing motion of the birds of prey has not been measured quantitatively,and synthetic bionic wings with morphing abilities similar to raptors are far from ***,in the current study,a 3D suspension system for holding bird carcasses was designed and fabricated to fasten the wings of Falco Peregrinus with a series of morphing ***,the wing skeleton of the falcon was scanned during extending motions using the computed tomography(CT)approach to obtain three consecutive ***,the skeleton was reconstructed to identify the contribution of the forelimb bones to the extending/folding *** by these findings,we propose a simple mechanical model with four bones to form a wing-morphing mechanism using the proposed pose optimisation ***,a bionic wing mechanism was implemented to imitate the motion of the falcon wing—divided into inner and outer wings with folding and twisting *** results show that the proposed four-bar mechanism can track bone motion paths with high fidelity.

关键词： Falco Peregrinus Raptor Suspension system CT scan Bionic wings Four-bar mechanism