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Stress distribution and fatigue life of nonlinear vibration of an axially moving beam

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Science China(Technological Sciences) 2019年第7期62卷 1123-1133页

作者： DING Hu HUANG LingLu DOWELL earl CHEN LiQun Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Shanghai 200072 China Department of Mechanical Engineering and Materials Science Duke University Durham 27708 USA Department of Mechanics Shanghai University Shanghai 200444 China

In this paper, the effects of the nonlinear vibration on stress distribution and fatigue life of the axially moving beam are *** parametric excitation of the flexible material is created by the pulsating moving speed. Three-to-one internal resonance condition is satisfied. The three-parameter model is adopted in the viscoelastic constitutive relation. The nonlinear vibration of the axially moving beam with parametric and internal resonance are studied by using the direct multiple scales method(MSM)with numerical simulation confirmation. Based on the approximate analytical solution, the distribution of tensile stress and bending stress on the axially moving beam is presented by adopting a V-belt as the prototype. Based on the maximum stable cyclic stress, the limit cycle response of the V-belt is utilized to evaluate the effect of the resonance on the fatigue life. Also, the influences of the internal resonance on the steady-state responses and the fatigue life of the V-belt are revealed. Numerical examples illustrate that large unwanted resonances occur and the second-order mode receives vibration energy from to the firstorder mode. The numerical results demonstrate that the nonlinear vibration significantly reduces the fatigue life of the *** fatigue life analysis method in this paper can be applied to the excited vibration of other axially moving systems and even static continuum.

关键词： axially moving beam nonlinear vibration parametric excitation internal resonance stress distribution V-belt

Intake and diet preference of dairy heifers grazing mixed or alternating rows of birdsfoot trefoil and cool-season grasses

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Grassland Research 2024年第3期3卷 219-229页

作者： Michael D.Peel Blair L.Waldron Jacob T.Briscoe Marcus F.Rose S.Clay Isom Kara J.Thornton Jacob A.Hadfield Kerry A.Rood J.earl creech USDA Agricultural Research Service Forage and Range Research Laboratory LoganUtahUSA Plants Soilsand Climate DepartmentUtah State UniversityLoganUtahUSA Animal Dairyand Veterinary Sciences DepartmentUtah State UniversityLoganUtahUSA College of Veterinary Medicine Utah State UniversityLoganUtahUSA

cattle;diet selection;dry-matter intake;legume;orchardgrass;perennial ryegrass;tall fescue;utilization Background:Mixtures with birdsfoot trefoil(BFT)increase herbage intake in grazing *** hypothesized that BFT spatially separated from grasses would increase preferential grazing of BFT and herbage intake compared to grass and BFT in mixed ***:Binary mixtures of BFT were established with orchardgrass,meadow bromegrass,tall fescue,and perennial ryegrass in alternating and in mixed *** were rotationally stocked with Jersey heifers,and herbage mass,intake,and preferential grazing were ***:Planting BFT in alternating rows did not affect herbage mass,intake,or BFT *** of spatial arrangement,pasture production averaged 4116 kg ha−1 per rotation,of which 32%was *** comprised 39%of herbage intake in alternating and mixed rows,7%greater(p=0.001)than offered,indicating partial preference for *** preferential grazing of BFT was in tall fescue and orchardgrass mixtures,but less than commonly reported for legumes grown in more contrasting spatial arrangements with cool-season ***:Grazing heifers showed partial preference for BFT over ***,the lack of an effect of spatial arrangement on herbage mass,herbage intake,and diet preference indicates that spatial arrangements greater than alternating rows may be needed to increase overall herbage intake.

关键词： mixed arrangement season

Historic Cities: Issues of Urban Conservation, edited by Jeff Cody and Francesco Siravo. Getty Conservation Institute, Los Angeles, 2019. 610 pp. $60.00. ISBN9781606065938

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Built Heritage 2021年第1期5卷 1-3页

作者： earl Kessler Bureau of Humanitarian Assistance USAID55512th StreetNWWashingtonDC 20004USA

Jeff Cody and Francesco Siravo have captured the crisis confronting historic cities and issued a call to action in Historic Cities:Issues of Urban *** book consolidates thinking about,investigations into and ac-tions taken that embarks us on a journey to educate us about and rescue historic cities for the value they repre-sent to us now and into the *** world is now URBAN and as much as the Development Set still ro-manticizes rural development at the expense of urban areas,it is cities—all sizes and kinds of cities—that are the future.

关键词： Urban Conservation sizes

The effect of total carbon on microscopic soil properties and implications for crop production

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Journal of Arid Land 2012年第3期4卷 251-259页

作者： Inma LEBRON Milton earl MCGIFFEN Jr Donald Louis SUAREZ Centre for Ecology and Hydrology Bangor Gwynedd LL57 2UW UK Department of Botany and Plant Science University of California Riverside CA 92521-0334 USA U.S. Salinity Laboratory Riverside CA 92521-0334 USA

Soil structure is a dynamic property affected by physical, chemical, and microbiological processes. Addition of organic matter to soils and the use of different management practices have been reported to impact soil structure and crop production. Moderation in soil temperature and increases in microbial activity and soil water retention are often suggested as reasons for the rise in crop yield when organic matter is added to the soil. Less is known about the direct effect of changes in soil structure on crop production. A field experiment was conducted to study the effect of summer cover crop and in-season management system on soil structure. The experiment was a nested design with summer cover crop as the main plot and management system as the subplot. Summer cover crop treatments included cowpea （Vigna unguiculata L. Walp.） incorporated into the soil in the fall （CI）, cowpea used as mulch in the fall （CM）, sudangrass （Sorghum vulgare） incorporated into the soil in the fall （S）, and dry fallow or bare ground （B）. Management systems were organic （ORG） and conventional （CNV） systems. Lettuce （Lactuca sativa L.） and cantaloupes （Cucumis melo L.） were cultivated in rotation in the plots for three consecutive years using the same cover crops and management systems for each plot. Disturbed and undisturbed soil cores were collected at the end of the third year and used for laboratory experiments to measure physical, chemical, and hy- draulic properties. Image analysis was used to quantify soil structure properties using a scanning electron micro- scope on thin sections prepared from the undisturbed soil cores. We found that total soil carbon was correlated with porosity, saturation percentage, and pore roughness. Pore roughness was correlated with crop production in gen- eral and with marketable production in particular. We found that the higher the complexity of the pore space, the more water retained in the soil, which may increase soil water residence and reduce plant

关键词： summer cover crop management systems soil structure properties total carbon

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斜激波总压损失率极小值理论解与物理意义

航空学报 2018年第12期39卷 149-158页

作者：史爱明 earl HDOWELL 西北工业大学航空学院NPU-Duke空气动力与气动弹性联合实验室西安710072 杜克大学普拉特工学院NPU-Duke空气动力与气动弹性联合实验室达勒姆277080300

以法向马赫数作为激波强度表征量,对斜激波关系式进行重新推导,得到了穿过激波总压损失率极小值的理论解。控制方程表达式为激波角对物面角的线性函数。依据斜激波总压损失率极小值解析公式,首先,绘制了针对超声速流总压损失率应用的楔... 详细信息

以法向马赫数作为激波强度表征量,对斜激波关系式进行重新推导,得到了穿过激波总压损失率极小值的理论解。控制方程表达式为激波角对物面角的线性函数。依据斜激波总压损失率极小值解析公式,首先,绘制了针对超声速流总压损失率应用的楔形角-激波角-马赫数的斜激波效率图。其次,通过生成斜激波三维总压损失率等值线图,呈现了总压损失率在楔形角-激波角-特征马赫数空间上的分布规律。此外,利用斜激波效率图,揭示了等总压损失率条件下马赫数与激波角的对称双解现象。

关键词：激波马赫数激波强度总压损失率斜激波效率图

Preclinical-to-clinical Anti-cancer Drug Response Prediction and Biomarker Identification Using TINDL

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Genomics, Proteomics & Bioinformatics 2023年第3期21卷 535-550页

作者： David earl Hostallero Lixuan Wei Liewei Wang Junmei Cairns Amin Emad Department of Electrical and Computer Engineering McGill UniversityMontrealQC H3A 0E9Canada Mila–Quebec Artificial Intelligence Institute MontrealQC H2S 3H1Canada Department of Molecular Pharmacology and Experimental Therapeutics Mayo ClinicRochesterMN 55905USA The Rosalind and Morris Goodman Cancer Institute McGill UniversityMontrealQC H3A 1A3Canada

Prediction of the response of cancer patients to different treatments and identification of biomarkers of drug response are two major goals of individualized ***,we developed a deep learning framework called TINDL,completely trained on preclinical cancer cell lines(CCLs),to predict the response of cancer patients to different *** utilizes a tissue-informed normalization to account for the tissue type and cancer type of the tumors and to reduce the statistical discrepancies between CCLs and patient ***,by making the deep learning black box interpretable,this model identifies a small set of genes whose expression levels are predictive of drug response in the trained model,enabling identification of biomarkers of drug *** data from two large databases of CCLs and cancer tumors,we showed that this model can distinguish between sensitive and resistant tumors for 10(out of 14)drugs,outperforming various other machine learning *** addition,our small interfering RNA(siRNA)knockdown experiments on 10 genes identified by this model for one of the drugs(tamoxifen)confirmed that tamoxifen sensitivity is substantially influenced by all of these genes in MCF7 cells,and seven of these genes in T47D ***,genes implicated for multiple drugs pointed to shared mechanism of action among drugs and suggested several important signaling *** summary,this study provides a powerful deep learning framework for prediction of drug response and identification of biomarkers of drug response in *** code can be accessed at https://***/ddhostallero/tindl.

关键词： Drug response Deep learning Explainable AI Cancer Gene knockdown experiment

Active sorting of orbital angular momentum states of light with a cascaded tunable resonator

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Light(Science & Applications) 2020年第1期9卷 1904-1913页

作者： Shibiao Wei Stuart K.earl Jiao Lin Shan Shan Kou Xiao-Cong Yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Department of Chemistry and Physics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityVictoria 3086Australia School of Engineering RMIT UniversityMelbourneVictoria 3001Australia School of Physics The University of MelbourneTin AlleyMelbourneVictoria 3010Australia

The orbital angular momentum(OAM)of light has been shown to be useful in diverse fields ranging from astronomy and optical trapping to optical communications and data ***,one of the primary impediments preventing such applications from widespread adoption is the lack of a straightforward and dynamic method to sort incident OAM states without altering the ***,we report a technique that can dynamically filter individual OAM states and preserve the incident OAM states for subsequent *** the working principle of this technique is based on resonance,the device operation is not limited to a particular *** states with different wavelengths can resonate in the resonator without any additional modulation other than changing the length of the ***,we are able to demonstrate a reconfigurable OAM sorter that is constructed by cascading such optical *** approach does not require specially designed components and is readily amenable to integration into potential applications.

关键词： resonator tunable momentum

Interpretatio Romana: an Influence on Old English Vocabulary

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外语教学 1997年第4期18卷 11-27页

作者： earl R. Anderson(Department of EnglishCleveland State University)

: Latin influences on early English vocabulary usually are considered atomistically: the idea is that individual Latin words are berrowed, although sometimes these words belong to a semantic field that reflects the type of cultural or political contact that led to the borrowing. Thus, words borrowed from Latin into dritinental Germanic before the fifth century A. D. mostIy belong to the semantic fields of commerce and military activity; words borrowed during the seventh century, when the AngloSaxons gradually adopted Christianity, mostly belong to the semantic fields of religion, literacy and edu-cation; and words bormwed from ca. 950 - 1020- the time of the Bencdictine Reform, mootly are words of a bookish, learned, or technical character and are the by-product of translation of Latin scholarly treatises into Old English.

关键词： Be an Influence on Old English Vocabulary Interpretatio Romana

Disaster Risk Reduction and Management: Recalling the Need for Paradigm Shift in Definition

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Journal of Geoscience and Environment Protection 2022年第6期10卷 86-105页

作者： earl Bailey Faculty of The Built Environment University of Technology Jamaica Kingston Jamaica

The paper articulates the need for a paradigm shift in defining the basis of what constitutes a disaster. This new framework must be sensitive to the need for a more theoretical approach to inform disaster and hazard management. Central to this is that the resulting approach cannot be muddled in linear rational and procedural doctrines but appreciate the dynamics of complex nonlinearity of disaster events. By engaging in thought experiment and critical analysis of existing literature, the paper deconstructs the normative paradigm of defining disaster. The end is to inform disaster management and risk reduction intervention and mitigation programmes. The presented alternative approach is sensitive of the need to equally include;spatial, political, social, parameters. These are appreciated as being equally important as those dealing with ecological and economic. The resulting not only include other elements, but also expands the definition to the complex conditions inherent in the origin of phenomena to the interaction of the phenomena with multiple and complex socio-spatial and demographic dynamics, and then appreciating the complex results of this nonlinear interaction. The need for a more substantive definition of disaster underlines the pre-analysis that is necessary for implementation of mitigation and prevention strategies. That disasters are becoming more complex is synonymous with the complexities inherent in post-war development dynamics.

关键词： Risk Reduction Disaster Management Origin-İnteraction-Resultant Spatial Nonlinear