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Liquid superlubricity of lubricants containing hydroxyl groups and their aqueous solution under rolling/sliding conditions

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Friction 2024年第1期12卷 164-173页

作者： Tomáš POLÁČek petr ŠPERKA Ivan KŘUPKA Faculty of Mechanical Engineering Brno University of TechnologyBrno 61669Czech Republic

Macroscale rolling/sliding conditions are in the superlubricity,a little-studied topic so *** purpose of this paper is to examine the formation of elastohydrodynamic lubrication(EHL)films by water-based lubricants(glycerol and polyethylene glycol(PEG)),providing superlubricous *** were carried out on an optical ball-on-disc tribometer under rolling/sliding *** film thickness was measured by the thin film colorimetric interferometry,and the viscosity of liquids was measured by rotational and high-pressure falling body *** results show that tribochemical reactions are not the mandatory reason for friction to reach the superlubricity level when using the water-based *** studied liquids themselves are almost *** the addition of water,the signs of shear thinning behavior disappear even *** conditions for this type of lubricant can be predicted using the known Hamrock–Dowson *** anomaly in the thickness of the lubricants was observed as an abrupt change at certain *** more PEG there is in the lubricant,the higher the thickness at the beginning of the jump.

关键词： macroscale superlubricity super low traction water-based lubricants elastohydrodynamic lubrication(EHL) film thickness

Numerical Simulation of Separated Flows in Channels

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Journal of Thermal Science 2012年第2期21卷 145-153页

作者： petr Louda Jaromír Príhoda petr Sváek Karel Kozel Czech Technical University in Prague Fac. of Mechanical Engineering Karlovo nám. 13 CZ-121 35 Praha 2 Institute of Thermomechanics AS CR v.v.i. Dolejkova 5 CZ-182 00 Praha 8

The work deals with numerical modelling of turbulent flows in channels with an expansion of the cross-section where flow separation and reattachment occur. The performance of several eddy viscosity models and an explicit algebraic Reynolds stress model (EARSM) is studied. The used test cases are flows in channels with various backward facing steps where the step is perpendicular or inclined and the top wall is parallel or deflected. Furthermore, a channel with the circular ramp is considered. The numerical solution is achieved by the finite volume method or by the finite element method. The results of both numerical approaches are compared.

关键词： backward facing step flow EARSM model SST model

Timing is everything:does early and late germination favor invasions by herbaceous alien plants?

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Journal of Plant Ecology 2018年第1期11卷 4-16页

作者： Margherita Gioria petr Pyšek Bruce A.Osborne Institute of Botany Department of Invasion EcologyThe Czech Academy of SciencesCZ-25243 PrůhoniceCzech Republic UCD School of Biology and Environmental Science University College DublinBelfieldDublin 4Ireland Department of Ecology Faculty of ScienceCharles University in PragueViničná7CZ-12844 Prague 2Czech Republic UCD Earth Institute University College DublinBelfieldDublin 4Ireland

Aims Plant invasions represent a unique opportunity to study the mechanisms underlying community assembly rules and species distribution *** a superior competitive ability has often been proposed as a major driver of successful plant invasions,its significance depends crucially on the timing of any competitive *** assess whether a mismatch in germination phenology can favor the establishment of alien species,allowing them to exploit vacant niches where competition is *** well as having important effects on the survival,growth and fitness of a species,asymmetric competition and potential soil legacies resulting from early or late germination can also impact on species ***,early or late germination comes at a cost,increases the risks of exposure to unfavorable conditions and requires an enhanced abiotic resistance if it is to lead to successful *** Findings While there are several anecdotal accounts of early and late ger-mination for invasive species,there are limited comparative data with resident species growing under natural *** evidence from grassland communities indicates that a short-term germination advantage or priority(few days/weeks)provides inva-sive species with a strong competitive advantage over native species and is a critical factor in many *** the exploitation of periods of low competition is a plausible mechanism for the suc-cessful establishment of many invasive plants,direct evidence for this strategy is still *** is particularly true with regard to the exploitation of late germination ***,long-term comparative monitoring of the germination phenology of invasive and native plants in situ is needed to assess its significance in a range of ecosystems and its impact on community dynamics.

关键词： competition germination invasive plants phenology temporal niche

Single balloon enteroscopy for endoscopic retrograde cholangiography in patients with Roux-en-Y hepaticojejuno anastomosis

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World Journal of Gastroenterology 2013年第44期19卷 8047-8055页

作者： Bohuslav Kianika Jan Lata Ivo Novotny petr Dítě Jirí Vaníek 2nd Clinic of Internal Medicine Department of Gastroenterology St. Anne’s University Hospital Brno 656 91 Brno Czech Republic University of Ostrava Faculty of Medicine 703 00 Ostrava Czech Republic Department of Gastroenterology Masaryk Memorial Cancer Institute 602 00 Brno Czech Republic Academic Centre of Digestive Oncology Faculty of Medicine University of Ostrava 703 00 Ostrava Czech Republic Department of Diagnostic Imaging and International Clinical Research Center (ICRC) St. Anne’s University Hospital Brno 656 91 Brno Czech Republic

AIM:To evaluate single balloon enteroscopy in diagnostic and therapeutic endoscopic retrograde cholangiography(ERC)in patients with Roux-en-Y hepaticojejunoanastomosis(HJA).METHODS:The study took place from January 2009to December 2011 and we retrospectively assessed 15patients with Roux-en-Y HJA who had signs of biliary *** total,23 ERC procedures were performed in these patients and a single balloon videoen-teroscope(Olympus SIF Q 180)was used in all of the cases.A transparent overtube was drawn over the videoenteroscope and it freely moved on the working part of the *** distal end was equipped with a silicone balloon that was inflated by air from an external pump at a pressure of≤5.4 *** technical limitations or rather the parameters of the single balloon enteroscope(working length-200 cm,diameter of the working channel-2.8 mm,absence of Albarran bridge)showed the need for special endoscopic ***:Cannulation success was reached in diagnostic ERC in 12 of 15 *** findings were normal in 1 of 12 *** in the remaining 11 patients showed some pathological *** of these(cystic bile duct dilation)was subsequently resolved *** treatment was initialized in the remaining 10 patients(5 with HJA stenosis,2 with choledocholithiasis,and 3 with both).This treatment was successful in 9 of 10 *** endoscopic therapeutic procedures included:balloon dilatation of HJA stenosis-11 times(7 patients);choledocholitiasis extraction-five times(5 patients);biliary plastic stent placement-six times(4 patients);and removal of biliary stents placed by us-six times(4 patients).The mean time of performing a single ERC was 72 *** longest procedure took 110 min and the shortest took34 *** shows that it is necessary to allow for more time in individual ***,these procedures require the presence of an *** did not observe any complications in these 15 ***

关键词： Single balloon enteroscopy Endoscopic retrograde cholangiography Roux-Y hepaticojejunoanastomosis Endoscopic diagnosis Endoscopic treatment

Identification of altitude profiles in 3D geovisualizations:the role of interaction and spatial abilities

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International Journal of Digital Earth 2019年第2期12卷 156-172页

作者： petr Kubíček Čeněk Šašinka Zdeněk Stachoň Lukáš Herman Vojtěch Juřík Tomáš Urbánek Jiří Chmelík Department of Geography Faculty of ScienceMasaryk UniversityBrnoCzech Republic HUME Lab Faculty of ArtsMasaryk UniversityBrnoCzech Republic Department of Psychology Faculty of ArtsMasaryk UniversityBrnoCzech Republic Department of Computer Graphics and Design Faculty of InformaticsMasaryk UniversityBrnoCzech Republic

Three-dimensional geovisualizations are currently pushed both by technological development and by the demands of experts in various applied *** the presented empirical study,we compared the features of real 3D(stereoscopic)versus pseudo 3D(monoscopic)geovisualizations in static and interactive digital elevation *** tested 39 high-school students in their ability to identify the correct terrain profile from digital elevation ***’performance was recorded and further analysed with respect to their spatial abilities,which were measured by a psychological mental rotation test and think aloud *** results of the study indicated that the influence of the type of 3D visualization(monoscopic/stereoscopic)on the performance of the users is not clear,the level of navigational interactivity has significant influence on the usability of a particular 3D visualization,and finally no influences of the spatial abilities on the performance of the user within the 3D environment were identified.

关键词： 3D geovisualizations stereoscopic and monoscopic 3D vision spatial abilities level of navigational interactivity

An integrated microfluidic platform for nucleic acid testing

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Microsystems & Nanoengineering 2024年第3期10卷 181-194页

作者： Antao Sun petra Vopařilová Xiaocheng Liu Bingqian Kou TomášŘezníček TomášLednický Sheng Ni JiříKudr Ondřej Zítka Zdenka Fohlerová petr Pajer Haoqing Zhang Pavel Neužil Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical University127 West Youyi RoadXi’anShaanxi 710072P.R.China Department of Chemistry and Biochemistry Mendel University in BrnoZemědělská161300 BrnoCzech Republic ITD Tech s.r.o Osvoboditelů100573581 BohumínCzech Republic Central European Institute of Technology Brno University of TechnologyPurkyňova 123Brno 61200Czech Republic Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina Department of Microelectronics Faculty of Electrical Engineering and CommunicationBrno University of TechnologyTechnická3058/10Brno 61600Czech Republic Military Health Institute U Vojenskénemocnice 120016200 Praha 6Czech Republic The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’anShaanxi 710049P.R.China Bioinspired Engineering and Biomechanics Center(BEBC) Xi’an Jiaotong UniversityXi’an 710049P.R.China

This study presents a rapid and versatile low-cost sample-to-answer system for SARS-CoV-2 *** system integrates the extraction and purification of nucleic acids,followed by amplification via either reverse transcriptionquantitative polymerase chain reaction(RT–qPCR)or reverse transcription loop-mediated isothermal amplification(RT–LAMP).By meeting diverse diagnostic and reagent needs,the platform yields testing results that closely align with those of commercial RT-LAMP and RT‒qPCR *** advantages of our system include its speed and *** assay is completed within 28 min,including sample loading(5 min),ribonucleic acid(RNA)extraction(3 min),and RT-LAMP(20 min).The cost of each assay is≈$9.5,and this pricing is competitive against that of Food and Drug Administration(FDA)-approved commercial *** some RNA loss during on-chip extraction is observed,the platform maintains a potential limit of detection lower than 297 *** makes the system particularly useful in environments where centralized laboratories are either unavailable or inconveniently *** key feature is the platform’s versatility,allowing users to choose between RT‒qPCR or RT‒LAMP tests based on specific requirements.

关键词： testing maintain versatile

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抗菌型鞋衬里革的制备及抗菌性能研究

中国皮革 2009年第5期38卷 12-15,26页

作者：辜海彬赵长青陈武勇郝霞 petr Hlavek 四川大学制革清洁技术国家工程实验室四川成都610065 捷克共和国Tomas Bata大学鞋与健康系

使用一种新的抗菌剂——4-(2-苯并噻唑基亚氨甲基)苯氧乙酸的铜配合物(简称CCBMP),以喷洒的方式加入到鞋衬里革中,并采用抑菌圈法和抑菌率法测定了鞋衬里革对从鞋内分离出来的霉菌、细菌和酵母菌的抑制效果,结果表明:当该化合物在鞋衬... 详细信息

使用一种新的抗菌剂——4-(2-苯并噻唑基亚氨甲基)苯氧乙酸的铜配合物(简称CCBMP),以喷洒的方式加入到鞋衬里革中,并采用抑菌圈法和抑菌率法测定了鞋衬里革对从鞋内分离出来的霉菌、细菌和酵母菌的抑制效果,结果表明:当该化合物在鞋衬里革中的含量为18.68g/kg时,鞋衬里革对混合细菌、混合霉菌和混合酵母菌的抑菌率,分别为99.83%、99.98%和99.99%,而要形成清晰的抑菌圈,它在鞋衬里革中的含量则要到达37.59g/kg。

关键词：抗菌剂鞋衬里革抗菌性能

Periodic surface functional group density on graphene via laserinduced substrate patterning at Si/SiO2 interface

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Nano Research 2020年第9期13卷 2332-2339页

作者： Karolina A.Drogowska-Horna Inam Mirza Alvaro Rodriguez petr Kovaricek Juraj Sladek Thibault J.-Y.Derrien Mindaugas Gedvilas Gediminas Raciukaitis Otakar Frank Nadezhda M.Bulgakova Martin Kalbac J.Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Dolejskova 2155/318223 PragueCzech Republic HiLASE Centre Institute of Physics of the Czech Academy of SciencesZa Radnict 82825241 Dolni BrezanyCzech Republic Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PragueBrehova 78/711519Czech Republic Center for Physical Sciences and Technology Savanoriu Ave.231LT-023000VilniusLithuania

Controlling the spatial distribution of functional groups on two-dimensional(2D)materials on a micrometer scale and below represents a fascinating opportunity to achieve anisotropic(opto)electronic properties of these *** patterns of covalent functionalization can lead to pericxJic potentials in the monolayer;however,creating such superstructures is very ***,we describe an original approach to the periodic functionalization of graphene induced by substrate patterning using a pulsed ***-induced periodic surface structures(LIPSS)are produced on silicon wafers with thermally-grown oxide *** irradiation conditions for the formation of UPSS confined at the SiO2/Si interface have been *** imprint their periodicity to the reactivity of the monolayer graphene placed on the substrate via modulation of its local doping *** method is clean,straightforward and scalable with high spatial resolution.

关键词： two-dimensional(2D)materials graphene functionalization laser-induced periodic surface structures(LIPSS) periodic patterns Raman spectroscopy atomic force microscopy(AFM)

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糖尿病患者特殊功能鞋抗菌鞋垫的制备

皮革科学与工程 2009年第2期19卷 5-12页

作者：辜海彬李萍萍王利黄妩王向华陈武勇 petr Hlavacek 四川大学制革清洁技术国家工程实验室四川成都610065 捷克共和国Tomas Bata大学鞋与健康系捷克Zlin27576272

制备了一种新的复配型抗菌剂(三氯新、尼泊金丁酯和2-氨基苯并噻唑/对甲酰基苯氧乙酸锌配合物(Zn(SD)2))乳液,并分别以喷洒和浸泡的方式对鞋里革和设计成型的PU发泡材料进行抗菌处理,以含少量该复配型抗菌剂的白乳胶将二者粘接起来,制... 详细信息

制备了一种新的复配型抗菌剂(三氯新、尼泊金丁酯和2-氨基苯并噻唑/对甲酰基苯氧乙酸锌配合物(Zn(SD)2))乳液,并分别以喷洒和浸泡的方式对鞋里革和设计成型的PU发泡材料进行抗菌处理,以含少量该复配型抗菌剂的白乳胶将二者粘接起来,制备出能用于糖尿病患者特殊功能鞋的抗菌鞋垫,同时系统考察了水洗和汗液浸泡对其抗菌性能的影响。结果表明,以20 g/L的复配型抗菌剂乳液处理后的鞋里革、PU发泡材料以及由它们制备的鞋垫对细菌、酵母菌和霉菌都具有良好的抑制效果,但抑菌效果都随着水洗和汗液浸泡次数的增加而逐渐减弱,其中,水洗对鞋垫抗菌性能的影响要比汗液浸泡作用强得多。尽管如此,水洗20次或用汗液浸泡6次后,鞋垫仍然表现出较好的抑菌效果,对所有供试菌种的抑制率都在97%以上。

关键词：糖尿病足特殊功能鞋抗菌鞋垫耐水洗性耐汗性