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Artificial intelligence-based predictive model of nanoscale friction using experimental data

Friction 2021年第6期9卷 1726-1748页

作者： Marko PERČIĆ sa.a.ZELENIKA Igor MEZIĆ University of Rijeka Faculty of Engineering51000 RijekaCroatia University of Rijeka Centre for Micro-and Nanosciences and Technologies&Center for Artificial Intelligence and Cybersecurity51000 RijekaCroatia University of California santa Barbara Department of Mechanical EngineeringSanta BarbaraCA 93105USA

A recent systematic experimental characterisation of technological thin films,based on elaborated design of experiments as well as probe calibration and correction procedures,allowed for the first time the determination of nanoscale friction under the concurrent influence of several process parameters,comprising normal forces,sliding velocities,and temperature,thus providing an indication of the intricate correlations induced by their interactions and mutual *** created the preconditions to undertake in this work an effort to model friction in the nanometric domain with the goal of overcoming the limitations of currently available models in ascertaining the effects of the physicochemical processes and phenomena involved in nanoscale *** to the stochastic nature of nanoscale friction and the relatively sparse available experimental data,meta-modelling tools fail,however,at predicting the factual *** on the acquired experimental data,data mining,incorporating various state-of-the-art machine learning(ML)numerical regression algorithms,is therefore *** results of the numerical analyses are assessed on an unseen test dataset via a comparative statistical *** is therefore shown that the black box ML methods provide effective predictions of the studied correlations with rather good accuracy levels,but the intrinsic nature of such algorithms prevents their usage in most practical *** programming-based artificial intelligence(AI)methods are consequently finally *** the marked complexity of the analysed phenomena and the inherent dispersion of the measurements,the developed AI-based symbolic regression models allow attaining an excellent predictive performance with the respective prediction accuracy,depending on the sample type,between 72%and 91%,allowing also to attain an extremely simple functional description of the multidimensional dependence of nanoscale friction on the studied variable process param

关键词： nanoscale friction thin films data mining machine learning(ML) predictive artificial intelligence(AI)-based model

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Computational Prediction of Micro RNAs from Toxoplasma gondii Potentially Regulating the Hosts' Gene Expression

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Genomics, Proteomics & Bioinformatics 2014年第5期12卷 228-238页

作者： Müs?erref Duygu sa.a. Caner Bagc? Jens Allmer Molecular Biology and Genetics Izmir Institute of Technology Urla Izmir 35430 Turkey Biotechnology Izmir Institute of Technology Urla Izmir 35430 Turkey Bionia Incorporated IZTEKGEB A8 Urla Izmir 35430 Turkey

MicroRNAs （miRNAs） were discovered two decades ago, yet there is still a great need for further studies elucidating their genesis and targeting in different phyla. since experimental discovery and validation of miRNAs is difficult, computational predictions are indispensable and today most computational approaches employ machine learning. Toxoplasma gondii, a parasite residing within the cells of its hosts like human, uses miRNAs for its post-transcriptional gene reg- ulation. It may also regulate its hosts＇ gene expression, which has been shown in brain cancer. since previous studies have shown that overexpressed miRNAs within the host are causal for disease onset, we hypothesized that T. gondii could export miRNAs into its host cell. We computationally predicted all hairpins from the genome of T. gondii and used mouse and human models to filter possible candidates. These were then further compared to known miRNAs in human and rodents and their expression was examined for T. gondii grown in mouse and human hosts, respectively. We found that among the millions of potential hairpins in T. gondii, only a few thousand pass filtering using a human or mouse model and that even fewer of those are expressed. since they are expressed and differentially expressed in rodents and human, we suggest that there is a chance that T. gondii may export miRNAs into its hosts for direct regulation.

关键词： Toxoplasma gondii MicroRNA Regulation Host interaction Parasite

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为交互网Internet的灵魂而战(下)

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电脑知识与技术 1995年第5期 50-52页

作者： David s.jackson ,徐忠国,李翠莲国营368厂国营368厂

二、保守派与新手之争交互网的老用户们无意接纳从现实世界加入进来的所谓“难民”。这些新用户并不急着去学网络工作中的陌生语言和那些古怪的习惯,而爱用嘲讽和无礼的“火焰”去互相问候。尤其当他们对网络规范一无所知,就更为严重。... 详细信息

二、保守派与新手之争交互网的老用户们无意接纳从现实世界加入进来的所谓“难民”。这些新用户并不急着去学网络工作中的陌生语言和那些古怪的习惯,而爱用嘲讽和无礼的“火焰”去互相问候。尤其当他们对网络规范一无所知,就更为严重。新手上场每年九月在美国,新来者(或称新手)和老用户之间的紧张关系便爆发了。新手就是那些新入学

关键词：加密系统新手用户新闻集团 Internet 信息板纽约美国 AOI 计算机

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Investigation of Particle Breakdown in the Production of Composite Magnesium Chloride and Zeolite Based Thermochemical Energy storage Materials

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Energy Engineering 2023年第10期120卷 2193-2209页

作者： Louis F.Marie Karina sałek Tadhg s.O’Donovan HeriotWatt University Institute of MechanicalProcess and Energy EngineeringEdinburghUK

Composite thermochemical energy storage(TCEs)represents an exciting field of thermal energy storage which could address the issue of seasonal variance in renewable energy ***,there are open questions about their performance and the root cause of some observed *** researchers have observed the breakdown of particles in their production phase,and in their *** study seeks to investigate the underlying cause of this *** and EDX analysis have been conducted on MgCl2 impregnated 13X zeolite composites of differing diameters,as well as LiX *** was done in order to study the level of impregnation of salt into the zeolite matrix,as well as the effect this impregnation process has on the morphology of the *** was conducted using ImageJ software to study the effect of the impregnation process on the diameter of the *** has been found that a by weight impregnation concentration of magnesium chloride of 11.90%for the LiX zeolite,and 7.59%and 5.26%for the large diameter 13X zeolite and the small diameter 13X zeolite respectively has been *** has been found that the impregnation process significantly affects themorphology of 13X zeolite particles,causing large fissures to form,and eventually resulting in the previously found breakdown of these *** has been verified that a primary factor influencing the breakdown of the 13X zeolite particles is the efflorescence and sub-fluorescence phenomena,which leads to a build-up of crystals in the zeolite *** has also been found that prolonged impregnation times and the use of high concentration salt solutions in the soaking process can induce significant crystal growth which also leads to the breakdown of these *** demonstrate that LiX zeolite is the optimum host matrix choice in these *** results will allow for the design of more resilient composite TCEs particles.

关键词： Composites thermochemical energy storage salt-in-porous-matrix zeolites seasonal storage

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The influence of various grease compositions and silver nanoparticle additives on electrically induced rolling-element bearing damage

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Friction 2024年第4期12卷 796-811页

作者： samuel BOND Robert L.jackson German MILLs Department of Chemistry and Biochemistry Auburn UniversityAuburn 36849-5412USA Department of Mechanical Engineering Auburn UniversityAuburn 36849-5412USA

Leakage currents accelerate surface degradation of metal contacts via small scale arcing across lubricating films,but recent observations suggest that metallic nanoparticle additives in lubricants may be useful to improve contact *** findings prompted a study that examined electrically induced surface pitting of steel contacts in the presence of several lubricating greases including some containing nanometer-sized colloidal silver(Ag)*** rolling sphere-on-disk experiments were conducted under electro-tribological loads employing polyurea greases derived from mineral and synthetic base oils with and without *** forces and electrical resistance were monitored continuously during the tests;surface changes were characterized by means of optical spectroscopy,stylus profilometry,and scanning electron microscopy(sEM)including compositional analysis using energy dispersive spectroscopy(EDs).The observations demonstrate that surface pitting induced by arcing occurs mainly at the points were the rolling motion changes direction and that eroded metal is deposited along the wear ***-sized pits are formed which contain carbon and oxygen indicating that arcing causes decomposition of the hydrocarbon *** findings indicate a significant inhibition of pitting is induced by the Ag nanoparticles;some greases containing other additives exhibit a similar,although less pronounced,effect.

关键词： electric motor bearings wheel bearings electric vehicles arcing electrically induced bearing damage pitting leakage current stray current

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sYNTHEsIs OF sOLUBLE POLY(3,4-DIHYDROXY-o-TOLYLENE):REDOX POLYMER

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Chinese Journal of Polymer science 2006年第1期24卷 41-46页

作者： sad Moulay Fatima M'zyène Laboratoire de Chimie-Physique Moléculaire et Macromoléculaire Faculté des sciences de l'Ingénieur Département de Chimie Industrielle Université de BlidaRoute de SoumèaB.P.270Blida 09000Algeria. Laboratoire de Chimie-Physique Moléculaire et Macromoléculaire Faculté des sciences de l'Ingénieur Département de Chimie Industrielle Université de BlidaRoute de SoumaB.P.270Blida 09000Algeria.

Conventional chloromethylation, paraformaldehyde/hydrogen chloride in acetic acid medium, was applied to 1,2- dimethoxybenzene. Chloroform-soluble poly（3,4-dimethoxy-o-tolylene） was obtained with an intrinsic viscosity of 0.034 dL g^-1. The polymer was evaluated as a condensation redox polymer precursor formed by a Friedel-Crafts reaction. Cleavage of the methoxy groups present in this polymer resulted in poly（3,4-dihydroxy-o-tolylene） which manifested a great air-oxidation resistance. The redox property of the latter polymer was found to be 1017 mV by potentiometric titration with 0.05 N ceric ammonium nitrate at 25℃. This midpotential was compared to that of catechol, a monomeric analogue, under the same titration conditions.

关键词： Poly(3,4-dimethoxy-o-tolylene) Poly(3,4-dihydroxy-o-tolylene) Redox polymer.

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Particle swarm Optimization Based support Vector Regression for Blind Image Restoration

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Journal of Computer science & Technology 2012年第5期27卷 989-995页

作者： Ratnakar Dash Pankaj Kumar sa Banshidhar Majhi Computer science and Engineering Department National Institute of Technology RourkelaRourkela 769008India

This paper presents a swarm intelligence based parameter optimization of the support vector machine （sVM） for blind image restoration. In this work, sVM is used to solve a regression problem. support vector regression （sVR） has been utilized to obtain a true mapping of images from the observed noisy blurred images. The parameters of sVR are optimized through particle swarm optimization （PsO） technique. The restoration error function has been utilized as the fitness function for PsO. The suggested scheme tries to adapt the sVM parameters depending on the type of blur and noise strength and the experimental results validate its effectiveness. The results show that the parameter optimization of the sVR model gives better performance than conventional sVR model as well as other competent schemes for blind image restoration.

关键词： image restoration support vector regression particle swarm optimization

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Present status of JT-60sa Project and Development of Heating systems for JT-60sa

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Plasma science and Technology 2011年第3期13卷 367-375页

作者： Yoshitaka IKEDA JT-60sa Team Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan

Present status of the JT-60sa （JT-60 super Advanced） project, implemented jointly by Europe and Japan since 2007, is described. The design of the main tokamak components was completed in late 2008, and all the scientific missions are preserved to contribute to ITER and DEMO reactors. The construction of the JT-60sa has begun with procurement activities for the superconducting magnet systems, vacuum vessel, in-vessel components and other components under the relevant procurement arrangements between the implementing agencies of JAEA （Japan Atomic Energy Agency） in Japan and Fusion for Energy in Europe. Designs and developments of the auxiliary heating systems for JT-60sa have been progressing at JAEA so as to provide the total injection power of 41 MW for 100 s.

关键词： JT-60sa ITER DEMO JAEA heating systems

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seasonal variability in CDOM absorption and fluorescence properties in the Barataria Basin,Louisiana,Usa

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Journal of Environmental sciences 2010年第10期22卷 1481-1490页

作者： shatrughan singh Eurico D'sa Erick swenson Department of Oceanography and Coastal sciences Louisiana State University

Absorption and fluorescence properties of chromophoric dissolved organic matter （CDOM） along a 124 km transect in the Barataria Basin, a large estuary located in Louisiana, Usa, were investigated during high and low flow periods of the Mississippi River in the spring and winter of 2008-2009. Mean CDOM absorption at 355 nm from the marine to the freshwater end member stations ranged from （3.25 ± 0.56） to （20.76 ± 2.43） m^-1 for the three month high flow period whereas it varied from （1.48 ± 1.08） to （25.45 ± 7.03） m^-1 for the same stations during low flow period. Corresponding salinity values at these stations indicated the influence of river and shelf exchanges in the lower basin and precipitation and runoff in the upper basin. An inverse relationship of CDOM absorbance and fluorescence with salinity observed in the basin could he a useful indicator of salinity. CDOM fluorescence also varied over a large range showing an approximately 8 to 12-fold increase between the marine and freshwater end members for the two flow seasons. Excitation-emission matrix spectral plots indicated the presence of various fluorescence components with highest being the A-peak, lowest the T-peak, and the C and M-peaks showing similar trends along the transect. During low flow season the A/C ratio were well correlated with station locations indicating increased terrestrial influence towards the upper basin. CDOM absorption and fluorescence at 355 nm were highly correlated and independent of CDOM sources suggesting that fluorescence could be used to characterize CDOM in the basin.

关键词： Barataria Basin chromophoric dissolved organic matter CDOM fluorescence excitation-emission matrix

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Bioinspired nanotransducers for neuromodulation

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Nano Research 2024年第2期17卷 618-632页

作者： Fan Yang Xiang Wu sa Cai Guosong Hong Department of Materials science and Engineering Stanford UniversityStanfordCA 94305USA Wu Tsai Neurosciences Institute Stanford UniversityStanfordCA 94305USA school of science Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China

The field of neuromodulation has experienced significant advancements in the past decade,owing to breakthroughs in disciplines such as materials science,genetics,bioengineering,photonics,and *** convergence of these fields has resulted in the development of nanotransducers,devices that harness the synergies of these diverse *** nanotransducers,essential for neuromodulation,often draw inspiration from energy conversion processes found in nature for their unique *** this review,we will delve into the latest advancements in wireless neuromodulation facilitated by optical,magnetic,and mechanical *** will examine their working principles,properties,advantages,and limitations in comparison to current methods for deep brain neuromodulation,highlighting the impact of natural systems on their design and ***,we will underscore potential future directions,emphasizing how continued progress in materials science,neuroscience,and bioengineering might expand the horizons of what is achievable with nanotransducer-enabled neuromodulation.

关键词： bioinspired synthesis neuromodulation mechanoluminescence focused ultrasound nanotransducers sono-optogenetics

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