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The effect of temperature on the wear behaviour of dental composites

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Biosurface and Biotribology 2022年第4期8卷 329-336页

作者： joseph A.Arsecularatne Serena Tran mark j.Hoffman School of Materials Science and Engineering UNSW SydneySydneyNew South WalesAustralia School of Mechanical and Manufacturing Engineering UNSW SydneySydneyNew South WalesAustralia School of Engineering University of NewcastleCallaghanNew South WalesAustralia

Despite numerous published studies on the wear of dental composites,few have considered the influence of temperature on the two-body wear ***,no previous work has considered the influence of temperature on dominant wear mecha-nisms during the consumption of hot substances,hence the focus of this ***-rocating wear tests were carried out at varying artificial saliva lubricant temperatures(37 and 57℃)and material loss was quantified using *** wear tracks were analysed using FIB/SEM/*** reveal that the wear rate of a dental composite can significantly increase with temperature,with fatigue/delamination and ploughing acting as dominant mechanisms.

关键词： dental composite temperature tribological performance wear mechanism

Senescence-specific Alteration of Hydrogen Peroxide Levels in Arabidopsis thaliana and Oilseed Rape Spring Variety Brassica napus ***

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journal of Integrative Plant Biology 2012年第8期54卷 540-554页

作者： Stefan Bieker Lena Riester mark Stahl jürgen Franzaring Ulrike Zentgraf ZMBP (Center for Plant Molecular Biology) University of TübingenAuf der Morgenstelle 2872076 Tübingen Germany Institute for Landscape and Plant Ecology kologiezentrum 2August-von-Hartmann-Str.370599 StuttgartGermany

In order to analyze the signaling function of hydrogen peroxide （H202） production in senescence in more detail, we manipulated intracellular H202 levels in Arabidopsis thaliala （L.） Heynh by using the hydrogen- peroxide-sensitive part of the Escherichia coil transcription regulator OxyR, which was directed to the cytoplasm as well as into the peroxisomes. H202 levels were lowered and senescence was delayed in both transgenic lines, but OxyR was found to be more effective in the cytoplasm. To transfer this knowledge to crop plants, we analyzed oilseed rape plants Brassica napus L. cv. Mozart for H20~ and its scavenging enzymes catalase （CAT） and ascorbate peroxidase （APX） during leaf and plant development. H202 levels were found to increase during bolting and flowering time, but no increase could be observed in the very late stages of senescence. With increasing H202 levels, CAT and APX activities declined, so it is likely that similar mechanisms are used in oilseed rape and Arabidopsis to control H202 levels. Under elevated CO2 conditions, oilseed rape senescence was accelerated and coincided with an earlier increase in H202 levels, indicating that H202 may be one of the signals to inducing senescence in a broader range of Brassicaceae.

关键词： Arabidopsis thaliana Brassica napus E. coil Oxy-RD intracellular hydrogen peroxide senescence phenotype catalase ascorbatePeroxidase elevated CO2.

INCIDENCE MATRIX APPROACH FOR CALCULATING READINESS LEVELS

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journal of Systems Science and Systems Engineering 2014年第4期23卷 377-403页

作者： mark A.London Thomas H.Holzer Timothy j.Eveleigh Shahryar Sarkani School of Engineering and Applied Science George Washington University

Contemporary system maturity assessment approaches have failed to provide robust quantitative system evaluations resulting in increased program costs and developmental *** assessment metrics,such as Technology Readiness Levels（TRL）,do not sufficiently evaluate increasingly complex *** System Readiness Level（SRL）is a newly developed system development metric that is a mathematical function of TRL and Integration Readiness Level（IRL） values for the components and connections of a particular *** acceptance has been hindered because of concerns over SRL mathematical operations that may lead to inaccurate system readiness *** inaccurate system readiness assessments are called readiness reversals.A new SRL calculation method using incidence matrices is proposed to alleviate these mathematical *** presence of SRL readiness reversal is modeled for four SRL calculation methods across several system *** regression analysis demonstrates that the proposed Incidence Matrix SRL（IMSRL）method has a decreased presence of readiness reversal than other approaches suggested in the *** SRL methods will foster greater SRL adoption by systems engineering professionals and will support system development risk reduction goals.

关键词： Technology Readiness Level(TRL) integration readiness level(IRL) system readiness level(SRL) system readiness graph theory systems engineering

Alternatives for large-scale production of cultured beef: A review

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journal of Integrative Agriculture 2015年第2期14卷 208-216页

作者： Matilda S M Moritz Sanne E L Verbruggen mark j Post Department of Physiology Maastricht UniversityMaastricht 6229 ER The Netherlands Department of Physics Chemistry and Biology Linkping UniversityLinkping SE-581 83 Sweden

Cultured beef is a method where stem cells from skeletal muscle of cows are cultured in vitro to gain edible muscle tissue. For large-scale production of cultured beef, the culture technique needs to become more efficient than today＇s 2-dimensional（2D） standard technique that was used to make the first cultured hamburger. Options for efficient large-scale production of stem cells are to culture cells on microcarriers, either in suspension or in a packed bed bioreactor, or to culture aggregated cells in suspension. We discuss the pros and cons of these systems as well as the possibilities to use the systems for tissue culture. Either of the production systems needs to be optimized to achieve an efficient production of cultured beef. It is anticipated that the optimization of large-scale cell culture as performed for other stem cells can be translated into successful protocols for bovine satellite cells resulting in resource and cost efficient cultured beef.

关键词： cultured beef microcarriers aggregated cells packed bed bioreactor cell culture

β-Chitin/Chitosan Obtained from Loligo and Humboldt Squids Effectiveness as Wound Dressing Material

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journal of Donghua University(English Edition) 2013年第5期30卷 406-409页

作者： jINDAN Rahim ZALAL Rahim hudson Samuel KING W Martin College of Textiles North Carolina State University College of Textiles Donghua University

A number of materials are utilized to develop wound care dressing materials with metallic treatments such as ionic silver and zinc. Metallic ions if used for a prolonged time may lead to toxicity. Alternatively chitin,a natural polysaccharide found in nature, is utilized. It is found in fungi, crabs, mushrooms,squids, octopus, and many other living organisms. Chitin has similar structure to cellulose but its deacetylated derivate chitosan has amine groups that provide potential antibacterial properties along with a number of other advantages. Chitin in its natural form is found in three different structural forms,namely α,β,and γ.The β-chitin and chitosan are mostly found in the exoskeleton of squids. Loligo and Humboldt squids were studied. It is anticipated that Humboldt chitin is more effective in serving as antibacterial material and can be utilized for wound care. Differences in steriochemical structure were observed among β-chitin structures obtained and amine group's presences were found along with ability of materials to swell.

关键词： β-chitin chitosan wound dressing material

On-Line Prediction of a Fixed-Bed Reactor Using K-L Expansion and Neural Networks

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Chinese journal of Chemical Engineering 1998年第4期6卷 21-27页

作者：周兴贵刘良宏戴迎春袁渭康 j.L.hudson Department of Chemical Engineering University of Virginia Charlottesville VA 22903 USA

An on-line prediction scheme combining the Karhunen-Love expansion and a recurrent neural network for a wall-cooled fixed-bed reactor is *** oxidation in a pilotscale,single tube fixed-bed reactor is chosen as a working system and a pseudo-homogeneous twodimensional model is used to generate simulation data to investigate the prediction scheme presentedunder randomly changing operating *** scheme consisting of the K-L expansion andneural network performs satisfactorily for on-line prediction of reaction yield and bed temperatures.

关键词： fixed-bed reactor artificial neural network. Karhunen-Loeve expansion

A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency

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Light(Science & Applications) 2024年第1期13卷 91-102页

作者： Weipeng Zhang joshua C.Lederman Thomas Ferreira de Lima jiawei Zhang Simon Bilodeau Leila hudson Alexander Tait Bhavin j.Shastri Paul R.Prucnal Department of Electrical and Computer Engineering Princeton UniversityPrinceton08544NJUSA NEC Laboratories America Princeton08540NJUSA Department of Electrical and Computer Engineering Queen’s UniversityKingstonK7L 3N6OntarioCanada Department of Physics Engineering Physics and AstronomyQueen’s UniversityKingstonK7L 3N6OntarioCanada

Radio-frequency interference is a growing concern as wireless technology advances,with potentially life-threatening consequences like interference between radar altimeters and 5 G cellular *** transceivers mix signals with varying ratios over time,posing challenges for conventional digital signal processing(DSP)due to its high *** challenges will worsen as future wireless technologies adopt higher carrier frequencies and data ***,conventional DSPs,already on the brink of their clock frequency limit,are expected to offer only marginal speed *** paper introduces a photonic processor to address dynamic interference through blind source separation(BSS).Our system-on-chip processor employs a fully integrated photonic signal pathway in the analogue domain,enabling rapid demixing of received mixtures and recovering the signal-of-interest in under 15 *** reduction in latency surpasses electronic counterparts by more than three orders of *** complement the photonic processor,electronic peripherals based on field-programmable gate array(FPGA)assess the effectiveness of demixing and continuously update demixing weights at a rate of up to 305 *** compact setup features precise dithering weight control,impedance-controlled circuit board and optical fibre packaging,suitable for handheld and mobile *** experimentally demonstrate the processor’s ability to suppress transmission errors and maintain signal-to-noise ratios in two scenarios,radar altimeters and mobile *** work pioneers the real-time adaptability of integrated silicon photonics,enabling online learning and weight adjustments,and showcasing practical operational applications for photonic processing.

关键词： processor mixing dynamic

结合GIS和多准则决策技术的区域尺度风能和太阳能农场适宜性评价

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城市规划学刊 2015年第4期 123-124页

作者： WATSON j hudson M

随着可再生能源使用越来越广泛,对可再生能源项目的选址也日益重要。这两类使用可再生能源的农场也会对视觉环境等带来负面影响,项目本身也有特定的选址要求。英国南安普顿大学研究团队在区域尺度上,对风能农场、太阳能农场的选址进行... 详细信息

随着可再生能源使用越来越广泛,对可再生能源项目的选址也日益重要。这两类使用可再生能源的农场也会对视觉环境等带来负面影响,项目本身也有特定的选址要求。英国南安普顿大学研究团队在区域尺度上,对风能农场、太阳能农场的选址进行了研究,提出了相应的适宜性评价方法。这项研究以中南英格兰区域为研究范围。该区域地处南部沿海,面积为17094km;,人口约591万

关键词：农场风能气候资源适宜性评价太阳能太阳辐射能区域尺度大阳 GIS

Many ways to repress!jAZ’s agony of choices

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Molecular Plant 2021年第5期14卷 714-716页

作者： mark Zander Waksman Institute of Microbiology Department of Plant BiologySchool of Environmental and Biological SciencesRutgersThe State University of New JerseyPiscatawayNJ 08554USA

The major plant hormone jasmonic acid(jA)controls a wide range of important biological processes;in particular stress responses and male reproductive development(Wasternack and Song,2017).Local de novo biosynthesis as well aslong-distance transport of jA and subsequent perception of its conjugate jasmonoyl-isoleucine(jA-lle)leads to the activation of a large transcriptional regulatory network with thousands of genes transcriptionally reprogrammed(Wasternack and Song,2017;Aerts et al.,2021).Key regulators of this jA-initiated transcriptional network are the jAZ(jASMONATE-ZIM DOMAIN)proteins that directly repress the master transcription factors(TFs)MYC2 to MYC5 and other TFs(Wasternack and Song,2017).

关键词： network initiated conjugate