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Brain age estimation:premise,promise,and problems

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Neural Regeneration Research 2025年第8期20卷 2313-2314页

作者： Jarrad Perron Ji Hyun Ko Graduate Program in Biomedical engineering Price Faculty of EngineeringUniversity of ManitobaWinnipegMBCanada PrairieNeuro Research Centre Kleysen Institute for Advanced MedicineHealth Sciences CentreWinnipegMBCanada Department of Human Anatomy and Cell Science Rady Faculty of Health SciencesUniversity of ManitobaWinnipegMBCanada

Premise:The com bined effects of modern healthcare practices which prolong lifespan and declining birthrates have created unprecedented changes in age demographics worldwide that are especially pronounced in Japan,South Korea,Europe,and North *** old age is the most significant predictor of dementia,global healthcare systems must rise to the challenge of providing care for those with neurodegenerative disorders.

关键词： estimation providing birth

Multi-Stage-Based Siamese Neural Network for Seal Image Recognition

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Computer Modeling in engineering & Sciences 2025年第1期142卷 405-423页

作者： Jianfeng Lu Xiangye Huang Caijin Li Renlin Xin Shanqing Zhang Mahmoud Emam School of Computer Science and Technology Hangzhou Dianzi UniversityHangzhou310018China Shangyu Institute of Science and engineering Hangzhou Dianzi UniversityShaoxing312300China faculty of Artificial Intelligence Menoufia UniversityShebin El-Koom32511Egypt

Seal authentication is an important task for verifying the authenticity of stamped seals used in various domains to protect legal documents from tampering and *** seal inspection is commonly audited manually to ensure document ***,manual assessment of seal images is tedious and laborintensive due to human errors,inconsistent placement,and completeness of the *** image recognition systems are inadequate enough to identify seal types accurately,necessitating a neural network-based method for seal image ***,neural network-based classification algorithms,such as Residual Networks(ResNet)andVisualGeometryGroup with 16 layers(VGG16)yield suboptimal recognition rates on stamp ***,the fixed training data categories make handling new categories to be a challenging *** paper proposes amulti-stage seal recognition algorithmbased on Siamese network to overcome these ***,the seal image is pre-processed by applying an image rotation correction module based on Histogram of Oriented Gradients(HOG).Secondly,the similarity between input seal image pairs is measured by utilizing a similarity comparison module based on the Siamese ***,we compare the results with the pre-stored standard seal template images in the database to obtain the seal *** evaluate the performance of the proposed method,we further create a new seal image dataset that contains two subsets with 210,000 valid labeled pairs in *** proposed work has a practical significance in industries where automatic seal authentication is essential as in legal,financial,and governmental sectors,where automatic seal recognition can enhance document security and streamline validation ***,the experimental results show that the proposed multi-stage method for seal image recognition outperforms state-of-the-art methods on the two established datasets.

关键词： Seal recognition seal authentication document tampering siamese network spatial transformer network similarity comparison network

Microstructure and mechanical properties of Cu-B4C and CuAl-B4C composites produced by hot pressing

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Rare Metals 2019年第12期38卷 1169-1177页

作者： Zulkuf Balalan Furkan Gulan Mechanical engineering Department Faculty of Engineering and ArchitectureUniversity of Bingol

Cu matrix composite materials reinforced with B4C particle at four different contents(1.5 wt%,3.0 wt%,4.5 wt% and 6.0 wt%) and also CuAl matrix composites with 13 wt% Al reinforced with B4C particle at four different contents(1.5 wt%,3.0 wt%,4.5 wt% and 6.0 wt%)were fabricated by hot pressing(HP) and a powder metallurgy(PM) *** samples were produced by keeping them at 880℃ at the constant pressure of 2.3×10~8 Pa for 6 *** density,microstructure and mechanical properties of the produced samples were *** microstructure and phase examinations were carried out by scanning electron microscope(SEM)and optical microscope(OM),energy-dispersive spectrometer(EDS) and X-ray diffractometer(XRD) *** hardness measurements,three-point bending test and impact test were conducted to determine the mechanical *** a result of the examinations,it was observed that the relative density values decreased with the increasing content of B4C and provided a relatively effective ***,it was homogeneously distributed in the produced ***,there was a considerable increase in the hardness and the bending strength of CuAl matrix specimens with Al addition.

关键词： Boron carbide Hot pressing Mechanical properties Aluminum

Examination of Sarikaya(Yozgat-Turkey) iron mineralization with rare earth element(REE) method

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Journal of Rare Earths 2010年第1期28卷 143-149页

作者： Nursel OKSUZ Sukru KOC Department of Geological engineering Faculty of Engineering & ArchitectureBozok University Department of Geological engineering Faculty of EngineeringAnkara University

Iron mineralizations in the study area are found in amphibolites in the localities of Buyukoren,Uzunkuyu-Atkayasi,and Karabacak and they display a predominantly banded *** paragenesis is dominated by magnetite and *** this study,iron mineralizations in Sarikaya were examined in terms of rare earth element(REE) contents and attempts were made to determine some physicochemical conditions that had an impact upon their *** this purpose,42 ore samples and 17 enriched magnetite samples...

关键词： iron magnetite volcanosedimantery rare earth elements Sarikaya(Yozgat)

Geochemical characteristics of the Eymir(Sorgun-Yozgat) manganese deposit,Turkey

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Journal of Rare Earths 2011年第3期29卷 287-296页

作者： Nursel OKSUZ Department of Geological engineering Faculty of Engineering&ArchitectureBozok University

The Eymir（Yozgat-Sorgun,Turkey） manganese deposit occurs within radiolarite cherts of the lower Cretaceous ophiolite *** mineralization was observed banded and lenticular *** geochemical characteristics of the Eymir deposit was studied by means of major oxide,trace and rare earth element（REE） contents and the origin of mineralization was *** correlation coefficients indicated the presence of strong positive relations between major oxides and various trace elements（Al2O3-Fe2O3：r=0.75;Al2O3-CaO：r=0.79;Al2O3-TiO2：r=0.80;Al2O3-Zr：r=0.66;TiO2-Fe2O3：r=0.98;TiO2-CaO：r=0.82;TiO2-Zr：r=0.85 and Fe2O3-Zr：r=0.89） and the contribution of mafic terrigenous material to the *** chondrite normalized REE graphics samples were characterized by highly negative and positive Ce *** showed negative anomaly in all *** negative Ce anomaly was typical to submarine hydrothermal deposits and positive Ce anomaly was indicative of hydrogenous *** negative Eu anomaly showed contamination from the continental crust and/or sediment contribution via *** values in the Eymir mineralization were computed from the equation of Ceanom=lg [3xCeN/（2xLaN＋NdN）] and anomalies were found as Ceanom-0.1 in 8 samples and Ceanom-0.1 in 12 *** values are indicative of both oxic and anoxic sedimentation *** available data indicated that the Eymir manganese deposit is a hydrothermal-hydrogenous type volcanosedimentary mineralization.

关键词： manganese geochemistry hydrogenous hydrothermal Eymir(Turkey-Yozgat) rare earths

Corrosion Properties of Ceramic-Based TiO_(2)Films on Plasma Oxidized Ti6Al4V/316L Layered Implant Structured Manufactured by Selective Laser Melting

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Journal of Bionic engineering 2021年第4期18卷 944-957页

作者： Hilmi Tekdir Tuba Yetim Ali Fatih Yetim faculty of engineering and architecture Department of Mechanical EngineeringErzurum Technical UniversityErzurum25050Turkey faculty of engineering and architecture Department of Chemical EngineeringErzurum Technical UniversityErzurum25050Turkey

Selective Laser Melting(SLM),one of the metal additive manufacturing methods in the powder bed,is frequently used in the production of 316L stainless steel *** this study,the effect of duplex surface modification(metal additive manufacturing and plasma oxidizing)on the corrosion resistance of 316L was ***6Al4V layer was formed by additive manufacturing on 316L produced by selective laser melting *** obtained layered Ti6Al4V/316L samples were oxidized by plasma at 650℃–750℃ and 1 h–4 h parameter ***_(2)ceramic layer was formed on the Ti6Al4V/316L structure by plasma oxidation process in several layer *** properties of the TiO_(2)layer were determined by Open Circuit Potential(OCP),potentiodynamic polarization,and Electrochemical Impedance Spectroscopy(EIS)tests in Simulated Body Fluid(SBF)***,the surface characterizations of the samples were determined by the Vickers micro-hardness tester,Scanning Electron Microscopy(SEM),and X-Ray Diffractometer(XRD)*** the results,it was obtained that the corrosion resistance of the plasma oxidized was higher than the untreated 316L and layered Ti6Al4V/316L *** best corrosion resistance was obtained under the 750℃ and 4 h parameter conditions because of the increasing plasma oxidizing time and temperature.

关键词： selective laser melting layered structure Ti6Al4V/316L plasma oxidizing TiO_(2) corrosion

Some New Results Related to Compact Matrix Operators in the Class((l_p)T,l_∞)

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Acta Mathematica Sinica,English Series 2015年第8期31卷 1339-1347页

作者： Katarina PETKOVI faculty of Civil engineering and architecture University of Nis

The main goal of this paper is to establish necessary and sufficient conditions for a matrix A ∈（（lp）T,l∞）, where T is an arbitrary triangle, 1 ≤ p ≤∞, to be a compact operator. In the past,only sufficient conditions were established in almost all of those cases, by using the Hausdorff measure of noncompactness. We improve those results by applying another method for the characterizations of compact linear operators between BK spaces.

关键词： BK spaces bounded and compact linear operators Hausdorff measure of noncompactness

The hydro-abrasive erosion wear behavior of duplex-treated surfaces of AISI H13 tool steel

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Science China(Technological Sciences) 2014年第5期57卷 1040-1051页

作者： TUTAR Mumin AYDIN Hakan DURMUS Ali BAYRAM Ali YIGIT Kurtulus Department of Mechanical engineering Faculty of Engineering and Architecture Uludag University

The influence of duplex surface treatments consisting of a DC-pulsed plasma nitriding process and subsequent coatings of CrN and TiAlN deposited by physical vapor deposition(PVD)on AISI H13 tool steel was studied in this *** treated samples were characterized using metallographic techniques,SEM,EDS,and microhardness ***-abrasive erosion wear tests were performed in a specifically designed wear tester in which the samples were rotated in a wear tank containing a mixture of distilled water and ceramic abrasive chips with a fixed rotational *** wear rates caused by the abrasive particle impacts were assessed based on accumulated weight loss *** worn surfaces were also characterized using optical microscopy,SEM,and *** measurements indicated a significant increase in the surface hardness of the duplex-treated *** surfaces of the samples with the TiAlN coating were approximately 15 times harder than that of the untreated samples and 3 times that of the plasma nitrided ***-abrasive erosion wear results showed that the duplex surface treatments,especially the CrN coating,displayed the highest erosion wear resistance.

关键词： plasma nitriding physical vapor deposition duplex surface treatment microhardness hydro-abrasive erosion wear

Non-uniform EWMA-PCA based cache size allocation scheme in Named Data Networks

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Science China(Information Sciences) 2018年第1期61卷 123-135页

作者： Narges MEHRAN Naser MOVAHHEDINIA Department of Computer architecture Faculty of Computer Engineering University of Isfahan

As a data-centric cache-enabled architecture, Named Data Networking(NDN) is considered to be an appropriate alternative to the current host-centric IP-based Internet infrastructure. Leveraging innetwork caching, name-based routing, and receiver-driven sessions, NDN can greatly enhance the way Internet resources are being used. A critical issue in NDN is the procedure of cache allocation and management. Our main contribution in this research is the analysis of memory requirements to allocate suitable Content-Store size to NDN routers, with respect to combined impacts of long-term centrality-based metric and Exponential Weighted Moving Average(EWMA) of short-term parameters such as users behaviours and outgoing *** determine correlations in such large data sets, data mining methods can prove valuable to *** this paper, we apply a data-fusion approach, namely Principal Component Analysis(PCA), to discover relations from short-and long-term parameters of the router. The output of PCA, exploited to mine out raw data sets, is used to allocate a proper cache size to the router. Evaluation results show an increase in the hit ratio of Content-Stores in sources, and NDN routers. Moreover, for the proposed cache size allocation scheme,the number of unsatisfied and pending Interests in NDN routers is smaller than the Degree-Centrality cache size scheme.

关键词： content centric networks Named Data Networks future Internet NDN cache size exponential weighted moving average principal component analysis