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Behaviors of a micro oil droplet in an EHL contact

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Friction 2016年第4期4卷 359-368页

作者： Xinming LI feng GUO shaopeng WANG Chenglong LIU Wenzhong WANG School of Mechanical Engineering Qingdao University of Technology Qingdao 266520 China School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China

Oil-air lubrication supplies lubricants in the form of droplets to elastohydrodynamic lubrication (EHL)contacts,such as those in high-speed spindle ***,there is a paucity of information related to understanding the lubrication behaviors of oil droplets within EHL *** this study,behaviors of lubricant droplets,in terms of spreading around a static contact as well as passing through a roiling contact,were studied with an optical ball-on-disk EHL test *** of oil droplet size,viscosity,and surface tension on droplet spreading were *** film formation was also investigated when droplets traveled through the EHL contact *** results indicated that droplet size and running speed significantly influenced film *** increasing entrainment speeds,a small droplet passed through the contact without spreading and generated films with a significant depression in the central contact region.

关键词： oil droplet spreading elastohydrodynamic lubrication optical interferometry

Genome research profile of two Cordyceps sinensis cDNA libraries

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Chinese Science Bulletin 2010年第14期55卷 1403-1411页

作者： ZHANG shaopeng feng Hui LI XiaoYan JIN YongSan DONG Wei Beijing Institute of Genomics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China StaffRoom of Traditional Chinese Medicine Diagnostics Beijing University of Chinese Medicine Beijing 100029 China Hangzhou Genomics Institute Hangzhou 310008 China Beijing Genomics Institute Beijing 100029 China

Cordyceps sinensis (CS) is well known as an ancient Chinese herb. It is used to expand bronchial smooth muscles, inhibit tumor growth and decrease blood pressure. Cordyceps sinensis is composed of two parts. One is the dead larvae body; the other is the stroma like withered grass. Up to now, few genome database articles about Cordyceps sinensis have been reported. In this study, two cDNA libraries were constructed using the worm part and grass part respectively for the first time. 12192 and 15456 clones from the worm-part (CSCA) and grass-part (CSBA) library were respectively picked. Sequences derived from CSCA were clustered into 1333 contigs and 2469 singlets, while those from CSBA were clustered into 1297 contigs and 2875 singlets. These ESTs include sequences representing a significant portion of proteins encoding genes in cell signalling, metabolism, information storage and processing. Some enzymes encoding genes were also found and linked with CS’s physiology such as proteases, peptidases, lipases and chitinase. Pairwise comparison between the two cDNA libraries was also studied. Some ESTs were found only in CSCA and some only in CSBA. Finally, a comparative genomics research was performed with Fusarium graminearum, Aspergillus nidulans, Neurospora crassa and Saccharomyces bayanus. The results indicate that the fungus’ genes maybe have complicated variation at the nucleic acid level, but the proteins translated are still conservative.

关键词：基因组数据库 cDNA文库冬虫夏草支气管平滑肌细胞信号传递小麦赤霉病菌比较基因组学环境技术

Progress and key challenges in catalytic combustion of lean methane

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Journal of Energy Chemistry 2022年第12期75卷 173-215,I0005页

作者： Xiangbo feng Lei Jiang Danyang Li shaopeng Tian Xing Zhu Hua Wang Chi He Kongzhai Li Xi’an Key Laboratory of Advanced Photoelectronics Materials and Energy Conversion Device School of ScienceXijing UniversityXi’an 710123ShaanxiChina State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093YunnanChina Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina National Engineering Laboratory for VOCs Pollution Control Material&Technology University of Chinese Academy of SciencesBeijing 101408China

As a primary type of clean energy,methane is also the second most important greenhouse gas after CO_(2)due to the high global warming *** quantities of lean methane(0.1–1.0 vol%)are emitted into the atmosphere without any treatment during coal mine,oil,and natural gas production,thus leading to energy loss and greenhouse *** general,it is challenging to utilize lean methane due to its low concentration and flow instability,while catalytic combustion is a vital pathway to realize an efficient utilization of lean methane owing to the reduced emissions of polluting gases(e.g.,NOxand CO)during the *** particular,to efficiently convert lean methane,it necessitates both the designs of highly active and stable heterogeneous catalysts that accelerate lean methane combustion at low temperatures and smart reactors that enable autothermal operation by optimizing heat *** this review,we discuss the in-depth development,challenges,and prospects of catalytic lean methane combustion technology in various configurations,with particular emphasis on heat management from the point of view of material design combined with reactor *** target is to describe a framework that can correlate the guiding principles among catalyst design,device innovation and system optimization,inspiring the development of groundbreaking combustion technology for the efficient utilization of lean methane.

关键词： Lean methane combustion Catalyst design Heat management Reactor optimization Catalytic mechanism

Yield and quality properties of silage maize and their influencing factors in China

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Science China(Life Sciences) 2022年第8期65卷 1655-1666页

作者： Mengying Zhao Yinping feng Yue Shi Haihua Shen Huifeng Hu Yongkai Luo Longchao Xu Jie Kang Aijun Xing shaopeng Wang Jingyun Fang State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China

Silage maize(Zea mays L.) is one of the most important forages in the world, and its yield and quality properties are critical parameters for livestock production and assessment of forage values. However, relationships between its yield and quality properties and the controlling factors are not well documented. In this study, we collected 5,663 observations from 196 publications across the country to identify the relationships between yield and quality properties of silage maize and to assess the impact of management practices and climatic factors on its yield and quality in China. The average dry matter yield of silage maize was(19.98±6.93) Mg ha^(-1), and the average value of crude protein, ether extract, crude ash, crude fiber, acid detergent fiber, neutral detergent fiber, nitrogen-free extract, and relative feed value was 7.86%±1.71%, 2.53%±1.01%, 5.05%±1.66%,23.97%±6.34%, 27.62%±7.12%, 51.60%±9.85%, 59.68%±7.72%, and 131.17±31.49, respectively. In general, its nutritive value decreased as its yield increased. Increasing planting density could increase the yield but inhibit the nutritive values, while increasing fertilization could benefit the nutritive values. Geographically, the yield increased and the nutritive value decreased from warm(south) to cold(north) regions. The length of growth duration was a major controlling factor for the patterns of these properties. Our findings provide insights for police-makers to make strategy for achieving high yield and good quality of silage maize and help local people to implement better management practices.

关键词： silage maize yield quality management practices climatic factors

Regulation of rheumatoid arthritis microenvironment via a self-healing injectable hydrogel for improved inflammation elimination and bone repair

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Bioactive Materials 2024年第6期36卷 287-300页

作者： Wenbo Geng Jie Zhao Bailong Tao Yulu Yang Qiaojian Duan Pengfei Gao Tingting He shaopeng Liu Qian feng Peng Zhao Kaiyong Cai Key Laboratory of Biorheological Science and Technology Ministry of Education College of BioengineeringChongqing UniversityChongqing400044PR China College of Medicine and Life Sciences Chengdu University of Traditional Chinese MedicineChengdu611137SichuanPR China Laboratory Research Center The First Affiliated Hospital of Chongqing Medical UniversityChongqing400016PR China

The rheumatoid arthritis(RA)microenvironment is often followed by a vicious circle of high inflammation,endogenous gas levels imbalance,and poor *** break the circle,we develop a dual-gas-mediated injectable hydrogel for modulating the immune microenvironment of RA and simultaneously releasing therapeutic *** hydrogel(DNRS gel)could be broken down on-demand by consuming excessive nitric oxide(NO)and releasing therapeutic hydrogen sulfide(H_(2)S),resulting in endogenous gas restoration,inflammation alleviation,and macrophage polarization to M2 ***,the hydrogel could suppress osteoclastogenesis and enhance ***,the intra-articularly injected hydrogel with methotrexate(MTX/DNRS gel)significantly alleviated inflammation and clinical symptoms and promoted the repair of bone erosion in the collagen-induced arthritis rat *** a result,in vivo results demonstrated that MTX/DNRS gel restored the microenvironment and improved the therapeutic effect of *** study provides a novel understanding of developing versatile smart delivery platforms for RA treatment.

关键词： Microenvironment Hydrogels Rheumatoid arthritis Nitric oxide Hydrogen sulfide

Performance enhancement for antipodal Vivaldi antenna modulated by a high-permittivity metasurface lens

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Frontiers of Information Technology & Electronic Engineering 2021年第12期22卷 1655-1665页

作者： shaopeng PAN Mingtuan LIN Lin QI Pan CHEN Yang feng Gaosheng LI College of Electrical and Information Engineering Hunan UniversityChangsha 410082China College of Electronic Science National University of Defense TechnologyChangsha 410073China

A metasurface unit is designed operating at 2–20 GHz to enhance the gain and radiation performance of an antipodal Vivaldi antenna(AVA).The unit has a simple structure,stable ultra-wideband performance,high permittivity,and can independently modulate two polarization modes electromagnetic *** analyze the current distribution on the unit and extract equivalent characteristic parameters to verify the ability of independent modulation on two polarization modes electromagnetic *** designed metasurface unit is integrated into the aperture of the AVA and forms the metasurface lens(ML)for guiding the propagation of electromagnetic *** types of ML are proposed and integrated into the AVA to design antennas Ant1 and *** modulation effect of the lens on the electromagnetic wave is analyzed from the perspective of electric field amplitude and phase,and the final design is *** the optimized design results,the AVA and the proposed Ant2 are fabricated and measured,and the measurement results are in good agreement with the simulation *** impedance bandwidth measured by Ant2 basically covers the 2–18 GHz frequency *** with the conventional AVA,the gain of the proposed Ant2 is increased by 0.6–3.7 d B,the sidelobe level is significantly reduced,and the directivity has also been clearly improved.

关键词： Antipodal Vivaldi antenna(AVA) Ultra-wideband High-permittivity Dual-polarization Metasurface lens(ML)

Review of ultraviolet ageing mechanisms and anti-ageing methods for asphalt binders

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Journal of Road Engineering 2022年第2期2卷 137-155页

作者： Yuanyuan Li Jianlin feng shaopeng Wu Anqi Chen Dongliang Kuang Tao Bai Yangming Gao Jizhe Zhang Linglin Li Liyao Wan Quantao Liu Zongwu Chen Dengjun Gu School of Civil Engineering and Architecture Wuhan Institute of TechnologyWuhan 430074China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Nottingham Transportation Engineering Centre School of Civil EngineeringUniversity of NottinghamNottingham NG72RDUK School of Materials Science and Engineering Chang’an UniversityXi’an 710064China Marie S.Curie Research Fellow Section of Pavement Engineering Faculty of Civil Engineering and GeosciencesDelft University of TechnologyDelft 2628 CNthe Netherlands School of Qilu Transportation Shandong UniversityJinan 250002China School of Automotive and Transportation Engineering Hefei University of TechnologyHefei 230000China Faculty of Engineering China University of GeosciencesWuhan 430074China

Asphalt binder is inevitably aged by ultraviolet(UV)light during its service *** ageing can significantly decrease the technical properties of asphalt *** sensitivity of asphalt to UV ageing and thermal-oxidative ageing differs,such that the UV ageing performance cannot be determined based on the thermal-oxidative ageing *** researches mainly focused on the chemical composite and technical performance changes of asphalt binder during UV ageing,and the UV light parameters effect on the ageing rate of asphalt ***,the theory for characterizing and explaining the development of UV ageing depth does not get too much attentions,and the UV ageing mechanism of asphalt binder is not very ***,it cannot guide to develop or select the good methods or anti-UV ageing additives for asphalt *** paper focuses on the latest researches of the mechanisms and anti-ageing methods of asphalt *** the increase of UV ageing time,the UV ageing of asphalt binder develops gradually from the surface to inner *** are various methods,such as low-penetration grade asphalt,less air void ratio,UV stabilizers and UV light absorbers,that can improve the UV ageing resistance of asphalt binders.A new theory of sensitive wavelengths of asphalt UV ageing is proposed,which can enrich the basic theory of asphalt UV *** on this theory,different wavelengths of UV light have different ageing effects on asphalt *** composite anti-UV ageing additives with barrier and specific absorption effects on UV light is proposed,and may have better improvement effect on the anti-UV ageing performance of asphalt binder.

关键词： Road engineering Asphalt pavement Asphalt binder UV ageing Anti-UV ageing method

Targeted Ptpn11 deletion in mice reveals the essential role of SHP2 in osteoblast differentiation and skeletal homeostasis

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Bone Research 2021年第1期9卷 75-85页

作者： Lijun Wang Huiliang Yang Jiahui Huang shaopeng Pei Liyun Wang Jian Q.feng Dian Jing Hu Zhao Henry M.Kronenberg Douglas C.Moore Wentian Yang Department of Orthopedic Surgery Brown University Alpert Medical School and Rhode Island HospitalProvidenceRI 02903USA Department of Mechanical Engineering University of DelawareNewarkDE DE19716USA Department of Biomedical Sciences Texas A&M College of Dentistry3302 Gaston AveDallasTX 75246USA Department of Comprehensive Dentistry Texas A&M College of Dentistry3302 Gaston AveDallasTX 75246USA Endocrine Unit Massachusetts General Hospital and Harvard Medical SchoolBostonMA 02114USA

The maturation and function of osteoblasts(OBs)rely heavily on the reversible phosphorylation of signaling *** date,most of the work in OBs has focused on phosphorylation by tyrosyl kinases,but little has been revealed about dephosphorylation by protein tyrosine phosphatases(PTPases).SHP2(encoded by PTPN11)is a ubiquitously expressed ***11 mutations are associated with both bone and cartilage manifestations in patients with Noonan syndrome(NS)and metachondromatosis(MC),although the underlying mechanisms remain ***,we report that SHP2 deletion in bone gamma-carboxyglutamate protein-expressing(Bglap+)bone cells leads to massive osteopenia in both trabecular and cortical bones due to the failure of bone cell maturation and enhanced osteoclast activity,and its deletion in Bglap+chondrocytes results in the onset of enchondroma and osteochondroma in aged mice with increased tubular bone ***,SHP2 was found to be required for osteoblastic differentiation by promoting RUNX2/OSTERIX signaling and for the suppression of osteoclastogenesis by inhibiting STAT3-mediated RANKL production by osteoblasts and *** findings are likely to explain the compromised skeletal system in NS and MC patients and to inform the development of novel therapeutics to combat skeletal disorders.

关键词： skeletal homeostasis SHP2

Mechanism of vertical crack formation in Yb_(2)SiO_(5) coatings deposited via plasma spray-physical vapor deposition

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Journal of Materiomics 2020年第1期6卷 102-108页

作者： Xiaofeng Zhang Chao Wang Ruijun Ye Chunming Deng Xinghua Liang Ziqian Deng shaopeng Niu Jinbing Song Guo Liu Min Liu Kesong Zhou Jian Lu Junli feng National Engineering Laboratory for Modern Materials Surface Engineering Technology Guangdong Institute of New MaterialsGuangzhou510650China Department of Mechanical Engineering City University of Hong KongHong KongChina Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science&TechnologyLiuzhou545000China Shenzhen Customs Industrial Products Inspection Technology Center Shenzhen518067China

Plasma spray-physical vapor deposition(i.e.,PS-PVD)is a promising method for obtaining advanced environmental barrier coatings(EBCs).The EBCs must meet some requirements in the application,in which the thermal cycle performance affects the service *** preparation of artificial vertical cracks in Yb_(2)SiO_(5) coatings is an effective approach for meeting the requirements above because vertical cracks provide a strain *** clarify the formation mechanism of vertical cracks during the PSPVD,the effects of coating thickness and substrate temperature on the formation of vertical cracks were *** addition,the interactions of spray powder and plasma flame during coating deposition were also characterized by optical *** is indicated that vertical cracks are formed due to a thermal expansion mismatch between Yb_(2)SiO_(5) and mullite coating,transient cooling after deposition and the nucleation of evaporated Yb_(2)SiO_(5) as well.

关键词： Environmental barrier coatings Yb_(2)SiO_(5)coating Vertical crack PS-PVD