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An acoustofluidic scanning nanoscope using enhanced image stacking and processing

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Microsystems & Nanoengineering 2022年第4期8卷 191-198页

作者： Geonsoo Jin Joseph rich Jianping Xia Albert JHe Chenglong Zhao Tony Jun Huang Thomas Lord Department of Mechanical Engineering and Material Science Duke UniversityDurhamNC 27708USA Department of Biomedical Engineering Duke UniversityDurhamNC 27708USA Department of Physics University of Dayton300 College ParkDaytonOH 45469USA Department of Electro-Optics and Photonics University of Dayton300 College ParkDaytonOH 45469USA

Nanoscale optical resolution with a large field of view is a critical feature for many research and industry areas,such as semiconductor fabrication,biomedical imaging,and nanoscale material *** scanning microscopes have been developed to resolve the inverse relationship between the resolution and field of view;however,those scanning microscopes still rely upon fluorescence labeling and complex optical *** overcome these limitations,we developed a dual-camera acoustofluidic nanoscope with a seamless image merging algorithm(alphablending process).This design allows us to precisely image both the sample and the microspheres simultaneously and accurately track the particle path and ***,the number of images required to capture the entire field of view(200×200μm)by using our acoustofluidic scanning nanoscope is reduced by 55-fold compared with previous ***,the image quality is also greatly improved by applying an alpha-blending imaging technique,which is critical for accurately depicting and identifying nanoscale objects or *** dual-camera acoustofluidic nanoscope paves the way for enhanced nanoimaging with high resolution and a large field of view.

关键词： image overcome stacking

Oxidation of a Co-base Superalloy

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Journal of Materials Science & Technology 2008年第6期24卷 883-890页

作者： Guichen HO u Zhiyuan LIu Hua WEI Qi ZHENG Xiaofeng SuN Hengrong G uAN Zhuangqi Hu Superalloy Division Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China China Aviation Powerplant Research Institute Zhuzhou 412002 China

The oxidation behavior of a cast polycrystalline Co-base superalloy was studied at temperatures from 900 to 1050℃ and analyzed by thermogravimetric analysis （TGA）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results indicate that a cast Co-base superalloy follows the subparabolic oxidation kinetics at 900 and 1000℃, which are controlled by the growth of the inner Cr-rich layer, and that after oxidation at 1050℃ for 200 h, it almost exhibits the linear oxidation kinetics possible due to the volatility of Cr-rich oxide. A mixed scale forms on the alloy after prolonged oxidation. The oxide scale formed at 900 and 1000℃ is composed of an outer layer of spinel and an inner continuous Cr-rich layer and at I050℃ is composed of a very discontinuous Cr-rich layer.

关键词： Co-base superalloy Oxidation Kinetics Microstructure

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动态转矩测试法

河北电力技术 1990年第1期9卷 70-74,F003页

作者： G.Gürich u.MiLz H.-C.Wolf 龚乐年南京大学

计及d′Alembert惯性力转矩后,动态条件下的转矩测量在形式上与静态条件下的测试相同。根据描述测试系统的微分方程可得动态条件下转矩测试普遍有效的测量原则。暂态过程中交流异步电动机气隙转矩的测量是一个很有实际意义的课题。由此... 详细信息

计及d′Alembert惯性力转矩后,动态条件下的转矩测量在形式上与静态条件下的测试相同。根据描述测试系统的微分方程可得动态条件下转矩测试普遍有效的测量原则。暂态过程中交流异步电动机气隙转矩的测量是一个很有实际意义的课题。由此利用一台异步电机组成了一个传动系统,并选择其气隙转矩作为被测量。根据这样一个模型系统研究了测试方法的可用性。

关键词：异步电机转矩测试

Effect of Ce-base mischmetal addition on the microstructure and mechanical properties of hot-rolled ZK60 alloy

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Journal of Magnesium and Alloys 2021年第3期9卷 995-1006页

作者： E.P.Silva R.H.Buzolin F.Marques F.Soldera u.Alfaro H.C.Pinto Institute of Engineering Science and Technology(IECT)Federal University of Vales do Jequitinhonha e Mucuri(UFVJM)JanaúbaMGBrazil São Carlos School of Engineering(EESC) University of São Paulo(USP)Department of Materials EngineeringCEP 13563-120 São Carlos-SPBrazil Christian Doppler Laboratory for Design of high-performance alloys by thermomechanical processing Kopernikusgasse 24/I8010 GrazAustria Technische universität Graz(Tu Graz) Institute of Materials ScienceJoining and FormingKopernikusgasse 24/I8010 GrazAustria Institute of Functional Materials Department of Materials Science and EngineeringSaarland UniversitySaarbrueckenGermany German Aerospace Center(DLR)Institute of Materials Research Linder Höhe51147 CologneGermany

Mg-Zn-Zr(ZK)alloys exhibit notably high mechanical strength amongst all magnesium alloy ***,due to the formation of low melting point Mg_3Zn_7-precipitates,these alloys are susceptible to hot cracking,thus compromising their metallurgical *** addition of rare earths to ZK alloys is an alternative to form higher melting point intermetallic compounds,speed up dynamic recrystallization,refine grain size,enhance corrosion resistance and extend the service temperature due to improved creep *** work deals with the effect of Ce-base mischmetal addition on the hot rolling behaviour of as-cast ZK60 *** microstructure investigation conducted using electron microscopy and X-Ray diffraction shows that precipitation of Mg_(7)Zn_(3) intermetallics occur during hot rolling,whereas no further precipitation is observed for the ZK60-Mm *** fragmentation of the intermetallic compounds occur during hot rolling and finer particles of Mg_(7)Zn_(3) are observed for the ZK60,whereas Mg_(7)Zn_(3) and Mg Zn_(2) Ce intermetallics are formed in the alloy modified with mischmetal addition.A higher fraction of dynamically recrystallized grains is observed for the ZK60-Mm in comparison to the *** recrystallization takes place in ZK60 with the formation of sub-grains near to the intermetallics and the addition of mischmetal promotes the occurrence of discontinuous recrystallization with the nucleation of new grains close to the *** mechanical strength and,in particular,the ductility of the hot-rolled alloys are notably improved when compared to the same alloys in the as-cast *** mechanical strength is,however,higher for the ZK60 *** solid solution strengthening,softer Mg Zn_(2) Ce intermetallics and more extensive recrystallization contribute to reduce the mechanical strength of *** in both alloys are initiated at coarse intermetallics and propagate through intermetallic-rich regions.

关键词： Magnesium alloys Hot rolling Mischmetal Recrystallization Microstructure Mechanical properties

Optimization of Transducer Location for Novel Non-Intrusive Methodologies of Diagnosis in Diesel Engines

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Sound & Vibration 2021年第3期55卷 221-234页

作者： S.Narayan M.u.Kaisan Shitu Abubakar Faisal O.Mahroogi Vipul Gupta Department of Mechanical Engineering Qassim UniversityBuraydah51452Saudi Arabia Department of Mechanical Engineering Ahmadu Bello UniversityZaria810211Nigeria Department of Mechanical Engineering Islamic University of MadinaMedina42351Saudi Arabia Department of Mechanical Engineering Indus International UniversityUna174301India

The health monitoring has been studied to ensure integrity of design of engine structure by detection,quantification,and prediction of *** detection of faults may allow the downtime of maintenance to be rescheduled,thus preventing sudden shutdown of *** cylinder pressure developed,vibrations and noise emissions data provide a rich source of information about condition of *** of vibrations and noise emissions are novel non-intrusive methodologies for which positioning of various transducers are important *** presented work shows applicability of these diagnosis methodologies adopted in case of diesel *** effects of changing various fuel injection parameters was *** of using non-intrusive technique has been analyzed by changing locations of *** of this worklies in exploring signal processing methods for various locations around the engine test set *** frequency ranges of contributing noise and vibration sources were ***-Frequency analysis showed the onset of various *** on the identification of various frequency bands,it is possible to device suitable filters in order to extract more information.

关键词： IC engines automotive vibrations and noise emissions condition monitoring specialized industrial machinery and equipment

Improved guided bone regeneration by combined application of unmodified, fresh autologous adipose derived regenerative cells and plasma rich in growth factors:A first-in-human case report and literature review

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World Journal of Stem Cells 2019年第2期11卷 124-146页

作者： ?nder Solakoglu Werner G?tz Maren C Kiessling Christopher Alt Christoph Schmitz Eckhard u Alt Dental Department of the university Medical Center Hamburg-Eppendorf Clinic for Periodontology and Implantology Department of Orthodontics Center of Dento-Maxillo-Facial MedicineUniversity of Bonn Institute of Anatomy Faculty of MedicineLMU Munich InGeneron GmbH InGeneron Inc. Isar Klinikum Munich

BACKGROuND Novel strategies are needed for improving guided bone regeneration(GBR) in oral surgery prior to implant placement, particularly in maxillary sinus augmentation(GBR-MSA) and in lateral alveolar ridge augmentation(LRA). This study tested the hypothesis that the combination of freshly isolated, unmodified autologous adipose-derived regenerative cells(uA-ADRCs), fraction 2 of plasma rich in growth factors(PRGF-2) and an osteoinductive scaffold(OIS)(uAADRC/PRGF-2/OIS) is superior to the combination of PRGF-2 and the same OIS alone(PRGF-2/OIS) in GBR-MSA/*** SuMMARY A 79-year-old patient was treated with a bilateral external sinus lift procedure as well as a bilateral lateral alveolar ridge augmentation. GBR-MSA/LRA was performed with uA-ADRC/PRGF-2/OIS on the right side, and with PRGF-2/OIS on the left side. Biopsies were collected at 6 wk and 34 wk after GBRMSA/LRA. At the latter time point implants were placed. Radiographs(32 mo follow-up time) demonstrated excellent bone healing. No radiological or histological signs of inflammation were observed. Detailed histologic,histomorphometric, and immunohistochemical analysis of the biopsies evidenced that uA-ADRC/PRGF-2/OIS resulted in better and faster bone regeneration than PRGF-2/*** GBR-MSA with uA-ADRCs, PRGF-2, and an OIS shows effectiveness without adverse effects.

关键词： Case report Cell-based therapy Guided bone regeneration Maxillary sinus augmentation Lateral alveolar ridge augmentation unmodified autologous adipose-derived regenerative cells Stem cells

Microscopic Mechanism of Neutron-proton Effective Mass Splitting in Neutron-rich Nuclear Matter

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IMP & HIRFL Annual Report 2005年 4-5页

作者： u. Lombardo Dipartimento di Fisica universit’a di Catania Italy and INFN-LNS

We explore the mechanism of the isospin splitting of neutron and proton effective masses in neutronrich nuclear matter within the framework of the Brueckner-Hartree-Fock (BHF) approach. First we find that the neutron-proton effective mass splitting in neutron-rich matter is dominated by the nonlocality of the microscopic s. p. potentials in spatial space,i. e.,by the isospin splitting of the k-mass shown in Fig.

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Disintegrated Comet Trail in Southern Tibet

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Open Journal of Geology 2018年第12期8卷 1102-1112页

作者： Mahesh u. Patil Thane India

In southern Tibet, there is a series of lakes in the region (82°30'E, 29°N and 90°30'E, 33°N). This study indicates that these lakes were formed by the impact of a single disintegrating comet that hit the region. Observation indicates that the lakes are unusually closely aligned and have a steep slope facing circular feature on the eastern side. Fractures and faults connecting these lakes can be observed over entire subject site hinting towards the multiple impact craters. The terrain is uneven and lakes are partially filled hence in some cases do not look like circular or elliptical. These lakes vary from 1 Km to 65 Km in diameter and are linearly aligned around a single line. Studies of deuterium by Yuan et al. (2011) [1] indicate an abrupt 4‰ increase in δ18O in middle Holocene period around 6000 years ago. The study indicates that the region is rich in diamond, Coesite, Platinum Group Elements (PGE), Stishovite, tektites, and other complex alloys, as would be expected from a high energy impact of an extraterrestrial object. The possibility of the impact as one of the reasons for the diamond in this region was also suggested by Wen-Ji Bai and Qing-Song Fang (2007) [2]. However in absence of definitive evidence they favoured mantle origin. Two possible reasons of absence of impact signature are source of sample and impact pattern. First is the source of the sample which is collected from the river beds of Yarlung-Zangbo Suture Zone of Tibet which is believed to be the origin of this diamond, however it ignores the fact that these rivers get water from lakes which are in the proposed impact zone and the second reason is the impact-pattern spread over close to 800 km which is not expected from the asteroid impact. It will therefore be prudent to test samples from the lake region to understand surface distortion features to confirm the impact. Based on satellite imagery major industrial development supported by road infrastructure in the subject regio

关键词： Comet Impact Micro Diamond Tibet lake Tektites Qingsongite Craters

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铝化物涂层拓扑密排相的研究进展

材料保护 2024年第2期57卷 98-107,147页

作者：黄良阳齐浩雄马瑞孟国辉刘梅军杨冠军西安交通大学金属材料强度国家重点实验室陕西西安710049

铝化物涂层因其良好的抗高温氧化能力而被应用于航机和燃机叶片的高温防护。在涂层制备与服役过程中,涂层与基体元素互扩散,使基体的相结构发生转变,导致在涂层/基体界面形成互扩散区(IDZ),并析出富含Re、W、Cr、Mo等元素的细小拓扑密排... 详细信息

铝化物涂层因其良好的抗高温氧化能力而被应用于航机和燃机叶片的高温防护。在涂层制备与服役过程中,涂层与基体元素互扩散,使基体的相结构发生转变,导致在涂层/基体界面形成互扩散区(IDZ),并析出富含Re、W、Cr、Mo等元素的细小拓扑密排相(TCP相)。TCP相的析出导致固溶强化效果减弱,同时作为一种脆性相促进了裂纹的产生,此外,互扩散区的形成减小了基体的承载面积,导致基体的高温蠕变性能下降。针对涂层TCP相的析出及IDZ的形成机理进行了介绍,分析了TCP相的类型(σ相、μ相、P相)、特点及对基体性能的危害。添加铂族改性元素和预沉积Ni层是抑制TCP相析出的主要方法,添加改性元素可以增大固溶元素的固溶度,并抑制TCP相的生长和成核,而预沉积Ni层可以减小固溶强化元素的扩散。最后,展望了未来可通过添加多元改性元素或元素改性与预沉积Ni相结合的方法来抑制铝化物涂层TCP相的析出。

关键词：铝化物涂层元素互扩散拓扑密排相改性元素预沉积 Ni