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微量供油下的线接触副润滑增效分析

中国机械工程 2024年第7期35卷 1205-1211页

作者：李书义郭峰黄柏林金薇梁鹏青岛理工大学机械与汽车工程学院青岛266520 香港城市大学机械工程系中国香港999077

实验发现亲/疏油交替供油的功能润湿表面能提高微量供油下有效润滑的成膜性能。基于此,建立了有限长滚子副润滑模型,分析了交替供油的亲/疏油带宽及工作参数对润滑性能的增强规律。研究发现,微量供油条件下可利用交替供油方式达到线接... 详细信息

实验发现亲/疏油交替供油的功能润湿表面能提高微量供油下有效润滑的成膜性能。基于此,建立了有限长滚子副润滑模型,分析了交替供油的亲/疏油带宽及工作参数对润滑性能的增强规律。研究发现,微量供油条件下可利用交替供油方式达到线接触副润滑增效的目的,但供油交替变换使接触区润滑性能不稳定,且润滑增效作用会受功能表面亲/疏油带宽和卷吸速度的影响。

关键词：线接触副微量润滑功能表面供油

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Protective effects ofLactobacillus plantarum against epithelial barrier dysfunction of human colon cell line NCM460

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World Journal of Gastroenterology 2010年第45期16卷 5759-5765页

作者： Mary pat Moyer INCELL Corporation San AntonioTX 78249United States

AIM: To investigate the effects of Lactobacillus plantarum (L. plantarum ) in the intestinal permeability and expression of tight junction (TJ) using the normal human colon cell line NCM460. METHODS: Paracellular permeability of NCM460 monolayers was determined by transepithelial electrical resistance and dextran permeability. Expression of TJ proteins in NCM460 cell monolayers was detected by Western blotting and quantitative real-time polymerase chain ***: L. plantarum played an important role in increasing transepithelial electrical resistance and decreasing the permeability to macromolecules of NCM460 monolayers against the disruption caused by enteropathogenic Escherichia coli (E. coli ) or enteroinvasive E. coli . L. plantarum also prevented the decrease in the expression of TJ proteins and F-actin in NCM460 ***: L. plantarum can protect against dysfunction of NCM460 intestinal epithelial barrier caused by enteropathogenic E. coli or enteroinvasive E. coli , and thus can be a potential candidate of therapeutic agents for the treatment of intestinal diseases.

关键词： Lactobacillus plantarum NCM460 Tight junction Intestinal barrier

Retinoblastoma: The Situation in Burkina Faso over Ten Years

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Open Journal of Ophthalmology 2024年第3期14卷 175-195页

作者： Amadou Ouattara Anicet Corneille Beremwidougou paté Sankara Mariam Traore Dolo Tierinyê Armand Meda Windinmanégdé Pierre Djiguimde Rolande Kabore Chantal Gabrielle Bouda Gertrude Augustine Meda Hien Jerome Sanou Jean Wenceslas Diallo Ahgbatouhabeba Zabsonre Ahnoux Ophthalmology Department Regional University Hospital of Ouahigouya Ouahigouya Burkina Faso Regional University Hospital of Ouahigouya Ouahigouya Burkina Faso National Center for the Fight against Blindness Ouagadougou Burkina Faso University Hospital of Sour Sanou Bobo-Dioulasso Burkina Faso Nouna District Hospital Nouna Burkina Faso University Hospital of Bogodogo Ouagadougou Burkina Faso University Hospital of Yalgado Ouedraogo Ouagadougou Burkina Faso

Context: In Burkina Faso, there is only one retinoblastoma treatment center located in the capital. Nowadays, the treatment of retinoblastoma has benefited from the contribution of scientific progress. Objective: The aim was to take stock of the situation of retinoblastoma in the pediatric oncology department from January 1, 2010 to December 31, 2019. Materials and Methods: This was a descriptive cross-sectional study with retrospective data collection over a 10-year period, based on records of patients admitted to pediatric oncology department of CHU-YO. Data were analysed using CS Pro version 7.2 software. Categorical variables were compared using Pearsons Chi-square test at the 5% significance level. Overall survival was estimated using the Kaplan-Meier method. Operational definitions were used for lost to follow-up, consultation and diagnosis delays. Results: We collected a total of 204 cases in 10 years, i.e. an annual average of 20.4 cases/year. The mean age at diagnosis was 37.5 months for unilateral cases and 26.4 months for bilateral cases. Male predominance was noted, with a sex ratio of 1.31. The majority of patients came from disadvantaged backgrounds (72% farming fathers and 91% housewives). Clinically, leukocoria and exophthalmos were the main presenting features. The average time to consultation was long (8.73 months) and unilateral localization was predominantly unilateral at 77%. In terms of treatment, 102 patients were eligible for curative treatment and 80 for palliative treatment. The prognosis was poor, with 41% death and numerous cases of lost to follow-up (18%). Overall survival was estimated at 32%. The factor associated with the lethality of retiniblastoma was the extension of the tumor to other organs. Conclusion: Recognition of the early clinical signs of retinoblastoma can anticipate the occurrence of this cancer. Health professionals should be encouraged to perform the Buckner test every time they come into contact with children aged 0 t

关键词： Retinoblastoma Prognosis Pediatric Oncology CHU-YO Burkina Faso

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放射性药物治疗中的剂量测定

中华核医学与分子影像杂志 2024年第6期44卷 380-384页

作者：杨楠(译) 刘嘉月(审校) 王风(审校) 朱华(审校) 杨志(审校) 北京大学肿瘤医院核医学科北京100142

放射性药物治疗已经在某些疾病中应用,并且该领域正在扩大。近年来,新的治疗性放射性药物已开发出来,更多的药物正在研究中。同时,内照射剂量测量作为一种个性化和潜在优化患者治疗的手段,越来越受到关注。内照射剂量测量是多方面的,该... 详细信息

放射性药物治疗已经在某些疾病中应用,并且该领域正在扩大。近年来,新的治疗性放射性药物已开发出来,更多的药物正在研究中。同时,内照射剂量测量作为一种个性化和潜在优化患者治疗的手段,越来越受到关注。内照射剂量测量是多方面的,该篇继续教育文章讨论了目前的技术状况,主题包括剂量测量的背景、内照射剂量学方法、在放射性药物治疗中纳入剂量测量计算的优缺点、实施患者特异性剂量测量的工作流程描述,并对该领域的未来进行展望。

关键词：放射性核素治疗阿尔法粒子俄歇电子剂量测量法放射生物学放射性药物

Application of physics-informed neural network in the analysis of hydrodynamic lubrication

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Friction 2023年第7期11卷 1253-1264页

作者： Yang ZHAO Liang GUO patrick pat Lam WONG School of Automotive and Transportation Engineering Shenzhen PolytechnicShenzhen 518055China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China Department of Mechanical Engineering City University of Hong KongHong KongChina

The last decade has witnessed a surge of interest in artificial neural network in many different areas of scientific *** the rapid expansion in the application of neural networks,few efforts have been carried out to introduce such a powerful tool into lubrication ***,this work aims to apply the physics-informed neural network(PINN)to the hydrodynamic lubrication *** 2D Reynolds equation is *** PINN is a meshless method and does not require big data for network training compared with classical *** results are consistent with those obtained by experiments and the finite element ***,we envision that the PINN method will have great application potential in lubrication and bearing research.

关键词： physics-informed neural network hydrodynamic lubrication slider bearing

CRYPTOFAUNAL COMMUNITIES OF CORAL REEFS

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Acta Oceanologica Sinica 1986年第4期5卷 603-613页

作者： pat HUTCHINGS The Australian Museum Sydney

INTRODUCTION Cryptofaunal communities consist of the animals and plants living within dead *** a very large part of a coral reef is composed of dead coral,the biomasses of crypto-faunal communities on a reef must be *** as many of the cryptofaunal animalsreproduce at regular intervals,rates of turnover of the community are also high and thusare major contributors to the productivity of coral ***(1973)collected a 4.7

关键词： CRYPTOFAUNAL COMMUNITIES OF CORAL REEFS

Laetmonice iocasica ***.,a new polychaete species(Annelida:Aphroditidae)from seamounts in the tropical Western Pacific,with remarks on *** Grube,1877

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Journal of Oceanology and Limnology 2021年第5期39卷 1805-1816页

作者： Xuwen WU pat HUTCHINGS Anna MURRAY Kuidong XU Laboratory of Marine Organism Taxonomy and Phylogeny Shandong Province Key Laboratory of Experimental Marine BiologyInstitute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Australian Museum Australian Museum Research InstituteSydney NSW 2000Australia Biological Sciences Macquarie UniversityNorth Ryde 2109Australia University of Chinese Academy of Sciences Beijing 100049China

Laetmonice Kinberg,1856 is a remarkable genus characterized by having harpoon notochaetae in the polychaete family *** describe a new species of Laetmonice,Laetmonice iocasica ***.,found from seamounts on the Caroline Ridge in the tropical Western *** new species is readily distinguished from congeners,particularly those distributed in the Indo-Pacific Ocean by possessing45 segments with 18 pairs of elytra,and the tuberculated harpoon notochaetae in the elytrigerous segments,which are replaced by tuberculated notochaetae without recurved fangs on segments 4 and *** iocasica *** closely related to *** Grube,1877,but differs in both morphology and the genetic distance of the mitochondrial cytochrome oxidase subunit I(COI)*** producta Grube,1877 contained five varieties reported in various marine areas,which have been raised to species ***,the records of *** from the Sagami B ay and Suruga B ay in Japan and in the south-eastern Australia remain obscure and probably represent a different *** data indicate that ***,which was originally described from Kerguelen Islands in the Southern Ocean and later commonly found on the Antarctic shelf,is probably distributed only at high latitudes of the Southern Hemisphere.

关键词： Polychaeta taxonomy biodiversity deep-sea

Stripe theory based numerical method for solving asymmetrical hysteresis of friction force in linear rolling guideways

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Science China(Technological Sciences) 2016年第9期59卷 1320-1327页

作者： ZHAO Yang XI YinHu MAO JunHong WONG patrick pat Lam Theory of Lubrication and Bearing Institute Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'an Jiaotong University Department of Mechanical and Biomedical Engineering City University of Hong Kong

Linear rolling guideways(LRGs) play an important role in precision engineering. In the pre-rolling region, the hysteretic friction force exerts great impacts on the positioning accuracy. Numerical and experimental studies of the hysteresis of friction force are presented in this paper. A model, which is based on the stripe theory and the simplified theory of rolling contact, is built to describe the transient hysteresis of the friction force. Then, the model is modified by taking the anelasticity effect into consideration. Experimentally, a linear motor direct-drive setup is utilized to measure the transient asymmetrical hysteresis of the friction force in the pre-rolling region of an LRG. The influences of the pre-rolling displacement and the dwelling time on the asymmetrical hysteresis of the friction force are studied. The numerical and experimental results are well correlated, which shows good accuracy of the model. The transient asymmetrical hysteresis of friction force in the pre-rolling region of LRGs can thus be determined using the model.

关键词： pre-rolling friction anelasticity hysteresis linear rolling guideway

Extra dimensions and atomic transition frequencies

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Chinese Physics B 2008年第1期17卷 70-75页

作者：李志刚倪维斗 Antonio Pulido patón Center for Gravitation and Cosmology Purple Mountain ObservatoryChinese Academy of Sciences

New unification theories predict large extra dimensions （LEDs）. If that is the case, gravity would be stronger at short ranges than what Newtonian gravity predicts. LEDs could also have effects at atomic level. In this paper we propose a new method to constrain the size of ‘gravity-only’ LEDs by analysing how these LEDs modify the energy of the atomic transitions 1s-2s and 2s-2p （Lamb shift）, in the particular case of the hydrogen and muonium atoms. We estimate these effects by using Bethe＇s non-relativistic treatment of Lamb shift. In the particular case of three LEDs, which may be a candidate to explain the interaction mechanism of dark matter particles, we have found that current knowledge in atomic spectroscopy could constrain their sizes to less than 10 μm. Although our contributions do not reach the sensitivity given by SN1987a, they are still slightly better than recent constraints given by Inverse Square Law tests of the Eoet-Wash group at Washington University, which gave R3 〈 36.6 μm.

关键词： large extra dimensions Lamb shift atomic spectroscopy