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A new strategy for corrosion protection of porous stainless steel using polypyrrole films

Journal of Materials Science & Technology 2020年第2期37卷 85-95页

作者： C.Garcia-Cabezon C.Garcia-Hernandez M.L.Rodriguez-Mendez F.Martin-Pedrosa Materials Engineering E.I.I.Universidad de Valladolid47011 ValladolidSpain UVASENS E.I.I.Universidad de Valladolid47011 ValladolidSpain

In this work,a method to improve the protection against corrosion of porous sintered stainless steel is *** is based on the electrodeposition of polypyrrole(PPy)layers doped with a large size counterion such as dodecylbenzenesulphonic acid(DBSA),a conducting polymer with high corrosion resistance and good *** efficacy of PPy coating depends on the adequate adhesion between the metal substrate and the coating *** protection against corrosion has been tested using 316 L stainless steel(SS)powder sintered at different conditions to evaluate the effect of the sintering atmosphere(nitrogen and vacuum)and cooling rates(furnace and water)on corrosion resistance,while wrought 316 L SS has been used as reference *** addition,two electrochemical deposition techniques have been tested to select the most *** circuit potential evolution,anodic polarization measurements and electrochemical impedance spectra have been used to evaluate corrosion protection in phosphate buffer saline *** has been evidenced that a more homogeneous and stable coating was obtained in the case of porous stainless *** corrosion potential shifted to nobler values and the anodic polarization branch became more *** porous samples have a good passivation performance with a lower stable passive current density and a higher breakdown *** transfer electronic resistance and the impedance module increase more than one order of ***,the porosity of sintered stainless steel is seen as an advantage for the improvement of the adherence of the PPy *** best corrosion protection is found for samples sintered in nitrogen and water-cooled.

关键词： Stainless steel Powder metallurgy Protection corrosion Electrodeposited films Polymer coatings

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5DGWO-GAN:A Novel Five-Dimensional Gray Wolf Optimizer for Generative Adversarial Network-Enabled Intrusion Detection in IoT Systems

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Computers, Materials & Continua 2025年第1期82卷 881-911页

作者： Sarvenaz Sadat Khatami Mehrdad Shoeibi Anita Ershadi Oskouei Diego Martín Maral Keramat Dashliboroun Department of Data Science Engineering University of HoustonHoustonTX 77204USA The WPI Business School Worcester Polytechnic InstituteWorcesterMA 01609USA School of Systems and Enterprises Stevens Institute of TechnologyHobokenNJ 07030USA Department of Computer Science Escuela de Ingeniería Informática de SegoviaUniversidad de ValladolidSegovia40005Spain Ernest G.Welch School of Art&Design Georgia State UniversityAtlantaGA 30303USA

The Internet of Things(IoT)is integral to modern infrastructure,enabling connectivity among a wide range of devices from home automation to industrial control *** the exponential increase in data generated by these interconnected devices,robust anomaly detection mechanisms are *** detection in this dynamic environment necessitates methods that can accurately distinguish between normal and anomalous behavior by learning intricate *** paper presents a novel approach utilizing generative adversarial networks(GANs)for anomaly detection in IoT ***,optimizing GANs involves tuning hyper-parameters such as learning rate,batch size,and optimization algorithms,which can be challenging due to the non-convex nature of GAN loss *** address this,we propose a five-dimensional Gray wolf optimizer(5DGWO)to optimize GAN *** 5DGWO introduces two new types of wolves:gamma(γ)for improved exploitation and convergence,and theta(θ)for enhanced exploration and escaping local *** proposed system framework comprises four key stages:1)preprocessing,2)generative model training,3)autoencoder(AE)training,and 4)predictive model *** generative models are utilized to assist the AE training,and the final predictive models(including convolutional neural network(CNN),deep belief network(DBN),recurrent neural network(RNN),random forest(RF),and extreme gradient boosting(XGBoost))are trained using the generated data and AE-encoded *** evaluated the system on three benchmark datasets:NSL-KDD,UNSW-NB15,and *** conducted on diverse IoT datasets show that our method outperforms existing anomaly detection strategies and significantly reduces false *** 5DGWO-GAN-CNNAE exhibits superior performance in various metrics,including accuracy,recall,precision,root mean square error(RMSE),and convergence *** proposed 5DGWO-GAN-CNNAE achieved the lowest RMSE values across the NSL-KDD,UNSW-NB15,and

关键词： Internet of things intrusion detection generative adversarial networks five-dimensional binary gray wolf optimizer deep learning

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Increasing the performance of anaerobic digestion:Pilot scale experimental study for thermal hydrolysis of mixed sludge

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Frontiers of Environmental Science & Engineering 2010年第2期4卷 135-141页

作者： S.I.PEREZ-ELVIRA M.FDZ-POLANCO F.FDZ-POLANCO Department of Chemical Engineering and Environmental Technology University of ValladolidValladolid 47011Spain

The performance of a pilot plant operation combining thermal hydrolysis(170℃,30 min)and anaerobic digestion(AD)was studied,determining the main properties for samples of fresh mixed sludge,hydrolyzed sludge,and digested sludge,in order to quantify the thermal pretreatment performance(disintegration,solubilisation,and dewaterability)and its impact on the anaerobic digestion performance(biodegradability,volatile solids reduction,and digester rheology)and end product characteristics(dewaterability,sanitation,organic and nitrogen content).The disintegration achieved during the thermal treatment enhances the sludge centrifugation,allowing a 70%higher total solids concentration in the feed to anaerobic *** digestion of this sludge generates 40%more biogas in half the time,due to the higher solids removal compared to a conventional *** waste generated can be dewatered by centrifugation to 7%dry solids without polymer addition,and is pathogen free.

关键词： anaerobic digestion(AD) biogas performance sludge thermal hydrolysis

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Stem cell-based approaches: Possible route to hearing restoration?

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World Journal of Stem Cells 2020年第6期12卷 422-437页

作者： María Beatriz Durán-Alonso Institute of Biology and Molecular Genetics University of ValladolidValladolid 47003Spain

Disabling hearing loss is the most common sensorineural disability *** affects around 466 million people and its incidence is expected to rise to around 900 million people by 2050,according to World Health Organization *** cases of hearing impairment are due to the degeneration of hair cells(HCs)in the cochlea,mechano-receptors that transduce incoming sound information into electrical signals that are sent to the *** to these cells is mainly caused by exposure to aminoglycoside antibiotics and to some anti-cancer drugs such as cisplatin,loud sounds,age,infections and genetic *** deficits may also result from damage to the spiral ganglion neurons that innervate cochlear *** from what is observed in avian and nonmammalian species,there is no regeneration of missing sensory cell types in the adult mammalian cochlea,what makes hearing loss an irreversible *** review summarizes the research that has been conducted with the aim of developing cell-based strategies that lead to sensory cell replacement in the adult cochlea and,ultimately,to hearing *** main lines of research are discussed,one directed toward the transplantation of exogenous replacement cells into the damaged tissue,and another that aims at reactivating the regenerative potential of putative progenitor cells in the adult inner *** from some of the studies that have been conducted are presented and the advantages and drawbacks of the various approaches discussed.

关键词： Hearing loss Cochlear hair cells Spiral ganglion neurons Cell regeneration Adult stem cells Cell transplantation

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Improvements in tribological and anticorrosion performance of porous Ti–6Al–4V via PEO coating

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Friction 2021年第5期9卷 1303-1318页

作者： C.Garcia-Cabezón M.L.Rodríguez-Méndez V.AmigóBorrás R.Bayón C.Salvo-Comino C.Garcia-Hernandez F.Martin-Pedrosa Materials Engineering E.I.I.Universidad de ValladolidValladolid 47011Spain BioecoUVA Research Institute Universidad de ValladolidValladolid 47011Spain Group UVASENS Escuela de Ingenierías IndustrialesUniversidad de ValladolidValladolid 47011Spain Instituto de Tecnología de Materials Univesitat Politécnica de ValenciaValencia 46022Spain Tribology Unit Fundación IK4-TeknikerEibar 20600Spain

Medical implants manufactured using biomaterial Ti–6Al–4V exhibit some *** higher elastic modulus than that of natural bone can cause stress shielding *** can be avoided using Ti–6Al–4V with pores in the implant ***,poor corrosion and tribocorrosion behaviors are yielded because of the large area exposed to the *** mitigate both issues,coating technologies can be *** plasma electrolytic oxidation(PEO)process is a cost‐effective process that has been used successfully in nonporous Ti *** this study,two PEO coatings with different amounts of Ca/P are ***,reports regarding their application in porous materials are *** effects of PEO treatments on corrosion and tribocorrosion in Ti–6Al–4V powder metallurgy are analyzed *** porous materials provide an efficient surface for PEO coatings,as demonstrated via scanning electron microscopy(SEM)and atomic force microscopy(AFM),and the porosity of the substrates improved the adherence of the *** corrosion resistance measured via electrochemical impedance spectroscopy confirmed the beneficial effect of the coatings,particularly for long exposure *** lower roughness,small pore size,and more compact film observed in the PEO–Ca/P sample resulted in favorable tribological and corrosion properties.

关键词： Ti‐based alloys corrosion tribocorrosion surface modification

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Degradation of indomethacin in river water under stress and non-stress laboratory conditions:degradation products,long-term evolution and adsorption to sediment

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Journal of Environmental Sciences 2017年第1期29卷 13-20页

作者： Juan J.Jimenez Maria I.Sanchez Rafael Pardo Beatriz E.Munoz Department of Analytical Chemistry Faculty of SciencesCampus Miguel DelibesUniversity of ValladolidPaseo de Belen 747012 ValladolidSpain I.U.CINQUIMA Campus Miguel DelibesUniversity of ValladolidPaseo de Belen 547011 ValladolidSpain Department of Analytical Chemistry School of Industrial EngineersUniversity of ValladoliclFrancisco Mendizdbal 147014 ValladolidSpain

The pharmaceutical compound indomethacin is not totally removed in wastewater treatment plants,whose effluents flow into aquatic environments;concentrations in the 0.1-100 ng/L range are commonly found in surface waters,and its fate is ***,biological,photochemical and thermal degradation assays were conducted under stress and non-stress conditions to estimate its degradation rate in river water and establish its degradation products over *** results revealed that direct sunlight irradiation promoted the complete degradation of indomethacin（2 μg/L） in less than 6 hr,but indomethacin was detected over a period of 4 months when water was kept under the natural day-night cycle and the exposure to sunlight was partially limited,as occurs inside a body of *** biological degradation in water was negligible,while the hydrolysis at pH 7.8 was *** were monitored by ultra-pressure liquid chromatography/quadrupole time-of-flight/mass spectrometry after solid-phase extraction,and six degradation products were found;their structures were proposed based on the molecular formulae and fragmentation observed in high-resolution tandem mass spectra.4-Chlorobenzoic and 2-acetamido-5-methoxybenzoic acids were the long-term transformation products,persisting for at least 30 weeks in water kept under non-stress ***,the degradation in the presence of sediment was also monitored over time,with some differences being *** adsorption coefficients of indomethacin and degradation products on river sediment were calculated;long-term degradation products did not have significant adsorption to sediment.

关键词： Indomethacin Degradation products River water Adsorption coefficients High-resolution mass spectrometry

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Stochastic Earned Duration Analysis for Project Schedule Management

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Engineering 2022年第2期8卷 148-161页

作者： Fernando Acebes David Poza JoséManuel González-Varona Adolfo López-Paredes GIR INSISOC-Department of Business Organization and CIM School of Industrial EngineeringUniversity of ValladolidValladolid 47011Spain

Earned duration management(EDM)is a methodology for project schedule management(PSM)that can be considered an alternative to earned value management(EVM).EDM provides an estimation of devia-tions in schedule and a final project duration *** is a key difference between EDM and EVM:In EDM,the value of activities is expressed as work periods;whereas in EVM,value is expressed in terms of *** this paper,we present how EDM can be applied to monitor and control stochastic *** explain the methodology,we use a real case study with a project that presents a high level of uncertainty and activities with random *** analyze the usability of this approach according to the activities network topology and compare the EVM and earned schedule methodology(ESM)for PSM.

关键词： Earned duration management Earned value management Stochastic project control Duration forecasting Uncertainty

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Strengthening of the Territorial Position of valladolid through Planning Strategies： Networks, Patterns and Centralities

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Journal of Civil Engineering and Architecture 2014年第9期8卷 1168-1177页

作者： Juan Luis de las Rivas Sanz Mario Paris School of Architecture Universidad de Valladolid Valladolid 47011 Spain

The urban condition of the European territory requires new approaches to explain the current development of cities and to propose new planning tools. The aim of this paper is to demonstrate that we can support an innovative perspective based on intermediate geographical scales, more useful for outlining the specific features of territory. While we analyze the territory, we should overcome the strictly local scale of the administrative boundaries and create new relationship between contemporary urban concepts （metropolization of territory and metapolis） and the regional ecological patterns. In the case of valladolid （E） urban/metropolitan area, we focus on both causes and process of city growth. We have understood that it could be inefficient for planning forgetting the real spatial configuration （the city is located in an intersection between two territorial corridors） and misunderstanding the territorial role of the city at different scales （the double centrality in the emerging urban area and in the region）. The significance of this case is to reveal the inter-scalar condition of places as generators of constraints in the contemporary urban fabric and, at the same time, to show the quality and the potential of places in the future urban realm.

关键词： Urban planning town planning city-region urban networks centralities green corridors

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Unexplained liver laceration after metastasis radiofrequency ablation

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World Journal of Gastroenterology 2009年第40期15卷 5103-5105页

作者： Esther Ua Javier Trueba Jose Manuel Montes Medical Oncology Service Clinical University Hospital of Valladolid Radiology Service Clinical University Hospital of Valladolid

Many studies have established the role of radiofrequency (RF) ablation as a minimally invasive treatment for liver metastases. Although relatively safe, several complications have been reported with the increased use of RF ablation. We describe here a case of unexplained liver laceration after a RF procedure. A woman who presented a solitary metachronous liver metastasis underwent RF ablation treatment for this lesion. Six hours later the patient displayed fatigue and pallor. Emergency blood tests showed a haemoglobin level of < 7 g/dL and markedly elevated transaminase levels. A computed tomography examination revealed two areas of liver laceration with haematoma, one of them following the path of the needle and the other leading away from the f irst. Following a blood transfusion, the patient was haemodynamically stable and completely recovered 24 h later. The patient remained in bed for 1 wk. No surgical intervention was required, and she was discharged 1 wk later.

关键词： Colon cancer Liver haemorrhage Liver laceration Liver metastases Radiofrequency ablation

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Internal dispersal of seed-inhabiting insects by vertebrate frugivores:a review and prospects

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Integrative Zoology 2011年第3期6卷 213-221页

作者： Ángel HERNÁNDEZ Department of Agroforestry University of ValladolidPalenciaSpain

The finding that some seed-inhabiting insects can survive passage through the entire digestive tract of seed-dispersing vertebrates is relatively recent,but evidence suggests that it does ***,I document this phenomenon,discuss its qualitative and quantitative dimensions,and offer suggestions for further *** few documented cases that I review include plant species belonging to different families,with varied fleshy fruit types,number of seeds per fruit and seed *** vertebrate frugivores involved include passerines that feed on relatively small fruits,and galliforms,and perissodactyls and primates that feed on larger *** seed-inhabiting insects in-volved are the larvae of seed-infesting wasps,parasitoid wasps and seed-infesting *** phenomenon has been verified in open,rural ecosystems in North America and Southern Europe,and in tropical and subtropical forests in South *** varied scenarios suggest that the qualitative dimension of the phenomenon is considerably greater than known thus far.A simple method for detecting new events is ***,re-search must also focus on the identity and biology of seed-feeding insects of wild fleshy fruits and their *** survival rates of seed-inhabiting insects after vertebrate gut passage are *** phenomenon generally appears to favor insect dispersal.

关键词： digestion-resistant insects endozoochory frugivory tetratrophic interactions tritrophic interactions

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