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Effect of Ablation Casting on microstructure and Casting Properties of A356 Aluminium Casting Alloy

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Acta metallurgica Sinica(English Letters) 2013年第1期26卷 85-91页

作者： v. Bohlooli m. Shabani mahalli S. m. A. Boutorabi Casting Research Center School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST) Center of Excellence for High Strength Alloys Technology (CEHSAT) School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST)

Recently the Ablation Casting Technology was invented as a new casting process to improve foundry products quality. In this study, the effects of processing variables on the porosity content, rnicrostructure and feedability of A356 casting alloy were investigated. Secondary dendrite arm spacing （SDAS） and eutectic silicon mor-phologies were studied to evaluate the influence of Ablation Casting on the rnicrostructure. Casting density was measured in order to identify porosity content and feedability of ablated and non-ablated specimens. In addition, solidification behavior of the samples was investigated by using thermal analysis technique. The cooling curves and the first derivative curves were plotted and compared with each other. Results showed the ablation process could increase solidification rate significantly. In addition, the microstructural evidences revealed that Ablation Casting process results in more fine and homogeneous structure compared to the non-ablated casting. The feedability improved, SDAS reduced to 35% and porosity content decreased to 3.84 vol.% by implementing this process. It concluded the Ablation Casting is an effective process to gain higher quality in aluminum foundry.

关键词： Ablation Casting A356 aluminium alloy microstructure Porosity Cooling curve

New approach to formation of coatings on mg-mn-Ce alloy using a combination of plasma treatment and spraying of fluoropolymers

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Journal of magnesium and Alloys 2022年第4期10卷 1033-1050页

作者： D.v.mashtalyar K.v.Nadaraia I.m.Imshinetskiy S.L.Sinebryukhov S.v.Gnedenkov Institute of Chemistry FEB RAS 159 Pr.100-letiyaVladivostok 690022Russia Far Eastern Federal University 10 Ajax BayRussky IslandVladivostok 690922Russia

This paper presents a method of the formation of composite polymer-containing coatings on a mg–mn–Ce magnesium alloy by forming a ceramic-like layer using plasma electrolytic oxidation(PEO)and subsequent spraying superdispersed polytetrafluoroethylene *** coating composition and their morphological features were studied by SEm,EDS,GDOES,and *** presented data confirm the embedding of fluoropolymer in the PEO *** evaluation of the corrosion properties of the formed composite polymer-containing coatings indicates a decrease in the corrosion current density by more than 3 orders of magnitude in comparison with the base PEO *** incorporation of a fluoropolymer in a PEO layer by more than 32%increases the load value at which abrasion of the coating to the substrate occurs and reduces the wear of the coating by more than 27 fold in comparison with the PEO *** has been established that composite coatings possess hydrophobic properties:the value of the contact angle attains 152°.

关键词： Plasma electrolytic oxidation Polytetrafluoroethylene Composite coatings Corrosion Wear Superhydrophobicity

maintenance of water uptake and reduced water loss contributeto water stress tolerance of Spiraea alba Du Roi and Spiraeatomentosa L.

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Horticulture Research 2014年第1期1卷 150-156页

作者： Kelly m Stanton michael v mickelbart Department of Horticulture and Landscape Architecture Purdue UniversityWest LafayetteIN 47907USA

Two primarily eastern US native shrubs,Spiraea alba Du Roi and Spiraea tomentosa L.,are typically found growing in wet areas,often with standing *** species have potential for use in the landscape,but little is known of their environmental requirements,including their adaptation to water *** geographic accessions of each species were evaluated for their response to water stress under greenhouse ***-ground biomass,water relations and gas exchange were measured in well-watered and water stress *** both species,water stress resulted in reduced growth,transpiration and pre-dawn water ***,both species also exhibited the ability to osmotically adjust to lower soil water content,resulting in maintained midday leaf turgor potential in all *** CO_(2) assimilation was reduced only in one accession of ***,primarily due to large reductions in stomatal *** lost a larger proportion of leaves than *** in response to water *** primary water stress tolerance strategies of *** and *** appear to be the maintenance of water uptake and reduced water loss.

关键词： stress primarily landscape

Diabetic Retinopathy Diagnosis Using Interval Neutrosophic Segmentation with Deep Learning model

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Computer Systems Science & Engineering 2023年第3期44卷 2129-2145页

作者： v.Thanikachalam m.G.Kavitha v.Sivamurugan Department of Information Technology Sri Sivasubramaniya Nadar College of EngineeringChennai603110India Department of Computer Science and Engineering University College of Engineering PtukottaiRajamadam614701India

In recent times,Internet of Things(IoT)and Deep Learning(DL)mod-els have revolutionized the diagnostic procedures of Diabetic Retinopathy(DR)in its early stages that can save the patient from vision *** the same time,the recent advancements made in machine Learning(mL)and DL models help in developing Computer Aided Diagnosis(CAD)models for DR recognition and *** this background,the current research works designs and develops an IoT-enabled Effective Neutrosophic based Segmentation with Optimal Deep Belief Network(ODBN)model i.e.,NS-ODBN model for diagnosis of *** presented model involves Interval Neutrosophic Set(INS)technique to dis-tinguish the diseased areas in fundus *** addition,three feature extraction techniques such as histogram features,texture features,and wavelet features are used in this ***,Optimal Deep Belief Network(ODBN)model is utilized as a classification model for *** model involves Shuffled Shepherd Optimization(SSO)algorithm to regulate the hyperparameters of DBN technique in an optimal *** utilization of SSO algorithm in DBN model helps in increasing the detection performance of the model *** presented technique was experimentally evaluated using benchmark DR dataset and the results were validated under different evaluation *** resultant values infer that the proposed INS-ODBN technique is a promising candidate than other existing techniques.

关键词： Diabetic retinopathy machine learning internet of things deep belief network image segmentation

RmCARTAm For DDoS Attack mitigation in SDN Using machine Learning

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Computer Systems Science & Engineering 2023年第6期45卷 3023-3036页

作者： m.Revathi v.v.Ramalingam B.Amutha Department of Computing Technologies SRM Institute of Science and TechnologyKattankulathurChennai603203Tamil NaduIndia

The impact of a Distributed Denial of Service(DDoS)attack on Soft-ware Defined Networks(SDN)is briefly *** approaches to detecting DDoS attacks exist,varying on the feature being considered and the method ***,the methods have a deficiency in the performance of detecting DDoS attacks and mitigating *** improve the performance of SDN,an efficient Real-time multi-Constrained Adaptive Replication and Traffic Approximation model(RmCARTAm)is sketched in this *** RmCARTAm considers different parameters or constraints in running different controllers responsible for handling incoming *** model is designed with multiple controllers to handle net-work traffic but can turn the controllers according to *** multi-con-straint adaptive replication model monitors different features of network traffic like rate of packet reception,class-based packet reception and target-specific *** to these features,the method estimates the Replication Turn-ing Weight(RTW)based on which triggering controllers are ***,the method applies Traffic Approximation(TA)in the detection of DDoS *** detection of a DDoS attack is performed by approximating the incoming traf-fic to any service and using various features like hop count,payload,service fre-quency,and malformed frequency to compute various support measures on bandwidth access,data support,frequency support,malformed support,route sup-port,and so *** all these support measures,the method computes the value of legitimate weight to conclude the behavior of any source in identifying the mal-icious *** node details are used in the mitigation of DDoS *** method stimulates the network performance by reducing the power factor by switching the controller according to different factors,which also reduces the *** the same way,the proposed model improves the accuracy of detecting DDoS attacks by estimating the features of incoming traffic in

关键词： DDoS SDN traffic approximation adaptive replication multi-controller support measures RTW

Antibacterial HA-coatings on bioresorbable mg alloy

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Journal of magnesium and Alloys 2024年第5期12卷 1965-1985页

作者： K.v.Nadaraia D.v.mashtalyar m.A.Piatkova A.I.Pleshkova I.m.Imshinetskiy m.S.Gerasimenko E.A.Belov v.v.Kumeiko D.N.Kozyrev K.A.Fomenko v.v.mostovaya B.R.Torpanov A.R.Biktimirov I.S.Osmushko S.L.Sinebryukhov S.v.Gnedenkov Institute of Chemistry FEB RAS 159 Pr.100-letiya VladivostokaVladivostok 690022Russia Far Eastern Federal University 10 Ajax BayRussky IslandVladivostok 690922Russia A.v.Zhirmunsky National Scientific Center of marine Biology FEB RAS 17 St.PalchevskogoVladivostok 690041Russia Regional Clinical Dermatovenerological Dispensary 18 V St.GamarnikaVladivostok 690033Russia NmIC“Treatment and Rehabilitation Center” 3 Ivankovskoe highwayMoscow 125367Russia

In this study,a calcium-phosphate coating was formed on a mg-mn-Ce alloy by the plasma electrolytic oxidation(PEO).The antibiotic vancomycin,widely used in the treatment of infections caused by Staphylococcus aureus(***),was impregnated into the *** with vancomycin showed high bactericidal activity against *** mechanical and electrochemical properties of the formed coatings were studied,as well as in vitro cytotoxicity tests and in vivo tests on mature male rats were *** to SEm,EDS,XRD and XPS data,coatings had a developed morphology and contained hydroxyapatite,which indicates high *** analysis of roughness of coatings without and with vancomycin did not reveal any differences,confirming the high roughness of the *** electrochemical tests,an increase in corrosion resistance by more than two times after the application of PEO coatings was *** to the results of an in vivo study,after 28 days of the implantation of samples with calcium phosphate PEO coating and vancomycin,no signs of inflammation were observed,while an inflammatory reaction developed in the area of implantation of bare alloy,followed by *** release tests from the coatings show a sharp decrease in the concentration of the released antibiotic on day 7 and then a gradual decrease until day *** the experiment,no significant deviations in the condition and behavior of the animals were observed;clinical tests did not reveal a systemic toxic reaction.

关键词： Bioactive coatings Biocompatibility mg alloy Plasma electrolytic oxidation Hydroxyapatite vancomycin

multi-conductor Line models for Harmonic Load-flow Calculations in Lv Networks with High Penetration of Pv Generation

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Journal of modern Power Systems and Clean Energy 2022年第5期10卷 1288-1301页

作者： Fernando m.Camilo m.E.Almeida Rui Castro v.Fernao Pires Institutode Engenhariade Sistemas e Computadores Investigacao eDesenvolvimento(INESC-ID)and TecnicoUniversity of LisbonLisbonPortugal ESTSetubal Polytechnics of SetubalSetuibalPortugal

Low-voltage(Lv) distribution networks are unbalanced and present loads with nonlinear behavior, which introduce harmonics in the networks. The predictable increase in photovoltaic microgeneration(Pv μG) accentuates this unbalanced characteristic, as well as poses new technical problems,namely voltage rise and reverse power flow. To accurately account for the distributed Pv and loads in the Lv network, unbalanced three-phase power flow algorithms should be utilized,where different approaches may be used to represent lines with various degrees of accuracy. The more accurate algorithm considers the electromagnetic coupling between the line conductors,whereas the simpler algorithm represents each conductor of the line as a single-phase line with pure resistive behavior. This paper aims to analyze the influence of the line model on the load flow in a highly unbalanced Lv network with a high penetration of Pv production, and considers the impact of the harmonics produced by nonlinear loads. Based on the results obtained,it is possible to identify the most suitable model to be used, depending on the study to be performed. Different scenarios of Pv generation and loads are addressed in this paper.

关键词： Line model nonlinear loads photovoltaic microgeneration unbalanced distribution network

Isomeric pair 95m,g Nb in the photonuclear reactions on natmo at the bremsstrahlung end-point energy of 38–93 mev

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Chinese Physics C 2023年第12期47卷 64-72页

作者： I.S.Timchenko O.S.Deiev S.m.Olejnik S.m.Potin v.A.Kushnir v.v.mytrochenko S.A.Perezhogin v.A.Bocharov Institute of Physics Slovak Academy of SciencesSK-84511 BratislavaSlovakia National Science Center"Kharkov Institute of Physics and Technology" 1Akademichna St.61108KharkivUkraine CNRS/IJCLAB 15 Rue Georges Clemenceau Str.Orsay91400France

The ^(nat)mo(γ,xnp)^(95m,g)Nb photonuclear reaction was studied using the electron beam from the NSC KIPT linear accelerator *** experiment was performed using the activation and off-line γ-ray spectrometric *** experimental isomeric yield ratio(IR) was determined for the reaction products ^(95m,g)Nb at the bremsstrahlung end-point energy E_(γmax) range of 38-93 *** obtained values of IR are in satisfactory agreement with the results of other studies and extend the range of previously known *** theoretical values of the yields Y_(m,g)(E_(γmax)) and the IR for the isomeric pair ^(95m,g)Nb from the ^(nat)mo(γ,xnp) reaction were calculated using the partial cross-sections σ(E) from the TALYS1.95 code for six different level density *** the investigated range of E_(γmax),the theoretical dependence of IR on energy was confirmed-the IR smoothly increases with increasing *** comparison showed a noticeable difference(more than 3.85 times) in the experimental IR relative to all theoretical estimates.

关键词： photonuclear reactions natmo isomeric pair 95m gNb isomeric yield ratio reaction yield bremsstrahlung end-point energy of 38–93 mev activation and off-lineγ-ray spectrometric technique TALYS1.95 level density model GEANT4.9.2.

One-loop approximation of mφller scattering in generalized Krein-space quantization

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Science China(Physics,mechanics & Astronomy) 2009年第2期52卷 212-217页

作者： F. PAYANDEH m. mEHRAFARIN m. v. TAKOOK Physics Department Amirkabir University of Technology Payame Noor University Physics Department Razi University

It has been shown that the negative-norm states necessarily appear in a covariant quantization of the free minimally coupled scalar field in de Sitter spacetime. In this processes ultraviolet and infrared di- vergences have been automatically eliminated. A natural renormalization of the one-loop interacting quantum field in minkowski spacetime (λφ 4) has been achieved through the consideration of the nega- tive-norm states defined in Krein space. It has been shown that the combination of quantum field theory in Krein space together with consideration of quantum metric fluctuation, results in quantum field the- ory without any divergences. Pursuing this approach, we express Wick’s theorem and calculate mφller scattering in the one-loop approximation in generalized Krein space. The mathematical consequence of this method is the disappearance of the ultraviolet divergence in the one-loop approximation.

关键词： quantum field theory Krein space negative energy states