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Microstructural evaluation and nanohardness of an AlcocucrFeNiTi high-entropy alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第5期26卷 634-641页

作者： c.d.gómez-esparza R.Peréz-Bustamante J.M.Alvarado-Orozco J.Mu?oz-Salda?a R.Martínez-Sánchez J.M.Olivares-Ramírez A.duarte-Moller centro de Investigación en Materiales Avanzados (cIMAV) Laboratorio Nacional de Nanotecnología cONAcYT-corporación Mexicana de Investigación en Materiales S.A.de c.V.(cOMIMSA) centro de Ingeniería y desarrollo Industrial Querétaro Campus centro de Investigación y de Estudios Avanzados del IPN Unidad Querétaro Universidad Tecnológica de San Juan del Río Escuela de Ingeniería civil Industrialy Mecánica Universidad De La Salle Bajío

An AlcocucrFeNiTi high-entropy alloy(HEA) was prepared by mechanical alloying and sintering to study the effect of Ti addition to the widely studied AlcocucrFeNi system. The structural and microstructural characteristics were investigated by X-ray diffraction(XRd), scanning electron microscopy(SEM), and transmission electron microscopy(TEM). The formation of four micrometric phases was detected: a cu-rich phase with a face-centered cubic(fcc) structure, a body-centered cubic(bcc) solid solution with cu-rich plate-like precipitates(fcc), an ordered bcc phase, and a tetragonal structure. The XRd patterns corroborate the presence of a mixture of bcc-, fcc-, and tetragonal-structured phases. The Vickers hardness of the alloy under study was more than twice that of the AlcocucrFeNi alloy. Nanoindentation tests were performed to evaluate the mechanical response of the individual phases to elucidate the relationship between chemical composition, crystal structure, and mechanical performance of the multiphase microstructure of the AlcocucrFeNiTi HEA.

关键词： high-entropy alloys mechanical alloying microstructure nanoindentation

Mechanical properties of the A356 aluminum alloy modified with La/ce

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Journal of Rare Earths 2013年第8期31卷 811-816页

作者： E. Aguirre-de la Torre R. Pérez-Bustamante J. camarillo-cisneros c.d. gómez-esparza H.M. Medrano-Prieto R. Martínez-Sánchez Advanced Materials Research center (cIMAV) National Laboratory of Nanotechnology

The research of rare earths for the synthesis of materials with improved mechanical performance is of great interest when they are considered for potential applications in the automotive industry. In this regard, the effect on the mechanical properties and microstmcture of the automotive A356 aluminum alloy reinforced with 0.2 （wt.%） AI-6ce-3La （AcL） was investigated. The AcL was added to the melted A356 alloy in the as-received condition and processed by mechanical milling. In the second route, the effect of the AcL processed by mechanical milling and powder metallurgy techniques was investigated, and compared with the results ob- tained from the A356 alloy strengthened with AcL in the as-received condition. Microstmctural properties were evaluated by means of X-ray diffraction in order to observe the solubility of ce/La in the A1 matrix. In addition, electron microscopy was employed in or- der to investigate the effect of milling time on the size and morphology of La/ce phase under milling process. Mechanical properties of the A356 alloy modified with AcL were measured by hardness and tensile test. For comparison unmodified specimens of the A356 were characterized according to the previous procedure. The microstructural and mechanical characterization was carried out in specimens alter solution and artificial aging. Observations in scanning electron microscopy indicated a homogeneous dispersion of La/ce phases by using both routes; however, mechanical results, in the modified A356 alloy with the AcL in the as-received condi- tion, showed an improvement in the mechanical performance of the A356 alloy over that reinforced with the AcL mechanically milled.

关键词： A356 rare earths mechanical milling mechanical properties

dinophysoid dinoflagellates from subphotic depths:Amphisolenia ***,dinofurcula tricornuta ***.,and dinophysis profunda ***.(dinophysales,dinophyceae)

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Journal of Oceanology and Limnology 2022年第2期40卷 703-711页

作者： Fernando gÓmez department of Biological and Environmental Sciences and Technologies University of SalentoLecce 73100Italy

Three species of dinophysoid planktonic dinoflagellates are described from the eastern Mediterranean *** *** was collected at 70-m depth in the Ionian *** small species showed a more asymmetric midbody and a proportionally longer neck when compared to the closer relative *** individuals of dinofurcula tricornuta *** at 154-m depth in the Marmara Sea are characterized by three posterior-oriented processes when compared to its congeneric *** is the first record of the genus dinofurcula beyond the eastern tropical Pacific *** profunda *** at 500-m depth in the Ionian Sea is characterized by ovate hypotheca and a serrate crest-like left sulcal list when compared to its close relative *** findings evidence an undescribed biodiversity in the under-sampled subphotic depths.

关键词： deep ocean dinophyta dinoflagellata Mediterranean Sea mesopelagic new species

Ultra‑Transparent and Multifunctional IZVO Mesh Electrodes for Next‑generation Flexible Optoelectronics

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Nano-Micro Letters 2025年第1期17卷 293-309页

作者： Kiran A.Nirmal Tukaram d.dongale Atul c.Khot chenjie Yao Nahyun Kim Tae geun Kim School of Electrical Engineering Korea UniversityAnam‑ro 145Seongbuk‑guSeoulRepublic of Korea computational Electronics and Nanoscience Research Laboratory School of Nanoscience and BiotechnologyShivaji UniversityKolhapur 416004India

Mechanically durable transparent electrodes are essential for achieving long-term stability in flexible optoelectronic ***,they are crucial for applications in the fields of energy,display,healthcare,and soft *** meshes represent a promising alternative to traditional,brittle,metal oxide conductors due to their high electrical conductivity,optical transparency,and enhanced mechanical *** this paper,we present a simple method for fabricating an ultra-transparent conducting metal oxide mesh electrode using selfcracking-assisted *** this method,we produced an electrode with ultra-transparency(97.39%),high conductance(Rs=21.24Ωsq^(−1)),elevated work function(5.16 eV),and good mechanical *** also evaluated the effectiveness of the fabricated electrodes by integrating them into organic photovoltaics,organic light-emitting diodes,and flexible transparent memristor devices for neuromorphic computing,resulting in exceptional device *** addition,the unique porous structure of the vanadium-doped indium zinc oxide mesh electrodes provided excellent flexibility,rendering them a promising option for application in flexible optoelectronics.

关键词： Self-cracking template Vanadium-doped indium zinc oxide mesh Organic solar cells Organic light-emitting diodes Flexible transparent memory

Morphology and distribution of Pronoctiluca (dinoflagellata, incertae sedis) in the Pacific Ocean

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Acta Oceanologica Sinica 2013年第4期32卷 71-76页

作者： gómez Fernando department of Biological Oceanography Institute of Oceanography University of S o Paulo

The diversity and distribution of Pronoctiluca, a marine dinoflagellate of enigmatic systematic position, was studied in the vicinity of the Kuroshio and Oyashio currents, the Philippines, celebes, Sulu and South china Seas, western and central equatorial and southeast Pacific Ocean. The abundance of Pronoctiluca was high- er, with a wide vertical distribution, in eutrophic temperate regions, whereas it was nearly absent in surface waters of oligotrophic tropical regions. Most of the specimens corresponded to P. spinifera. Pronoctiluca pelagica, covered by hyaline layers and with no flagella, is considered as an encysted form. The bipartition was only observed in P. acuta-P, spinifera forms, that together with the occurrence of intermediate forms between P. spinifera and P. pelagica suggest that they may correspond to developmental stages of a single species. Pronoctiluca is essential to understanding the evolutionary history of the alveolates.

关键词： Alveolata basal dinoflagellates dinophyceae heterotrophic flagellate Noctilucales plankton

Technology innovation for infectious diseases in the developing world

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Infectious diseases of Poverty 2012年第1期1卷 6-14页

作者： Anthony d So Quentin Ruiz-esparza Program on global Health and Technology Access Sanford School of Public Policy and Duke Global Health InstituteDuke University302 Towerview DriveCB#90312DurhamNorth Carolina 27708USA

Enabling innovation and access to health technologies remains a key strategy in combating infectious diseases in low-and middle-income countries(LMIcs).However,a gulf between paying markets and the endemicity of such diseases has contributed to the dearth of R&d in meeting these public health *** the pharmaceutical industry views emerging economies as potential new markets,most of the world’s poorest bottom billion now reside in middle-income countries-a fact that has complicated tiered access ***,product development partnerships-particularly those involving academic institutions and small firms-find commercial opportunities in pursuing even neglected diseases;and a growing pharmaceutical sector in BRIcS countries offers hope for an indigenous base of *** innovation will be shaped by 1)access to building blocks of knowledge;2)strategic use of intellectual property and innovative financing to meet public health goals;3)collaborative norms of open innovation;and 4)alternative business models,some with a double bottom *** such resource constraints,LMIcs are poised to develop a new,more resource-effective model of innovation that holds exciting promise in meeting the needs of global health.

关键词： Innovation Technology Access Policy Public health R&d collaboration R&d Business model Open source Open innovation

A stable anthraquinone-derivative cathode to develop sodium metal batteries: The role of ammoniates as electrolytes

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Journal of Energy chemistry 2023年第2期77卷 572-580,I0015页

作者： débora Ruiz-Martínez José M.Orts Roberto gómez departament de Química Física i Institut Universitari d’Electroquímica Universitat d’AlacantApartat 99Alicante E-03080Spain

Rechargeable sodium metal batteries constitute a cost-effective option for energy storage although sodium shows some drawbacks in terms of reactivity with organic solvents and dendritic *** we demonstrate that an organic dye,indanthrone blue,behaves as an efficient cathode material for the development of secondary sodium metal batteries when combined with novel inorganic *** electrolytes are ammonia solvates,known as liquid ammoniates,which can be formulated as NaI·3.3NH_(3) and NaBF_(4)·2.5NH_(3).They impart excellent stability to sodium metal,and they favor sodium non-dendritic growth linked to their exceedingly high sodium ion *** advantage is complemented by a high specific *** battery described here can last hundreds of cycles at 10 c while keeping a coulombic efficiency of 99%from the first *** of the high capacity of the cathode and the superior physicochemical properties of the electrolytes,the battery can reach a specific energy value as high as 210 W h kgIB^(-1),and a high specific power of 2.2 kW kgIB^(-1),even at below room temperature(4℃).Importantly,the battery is based on abundant and cost-effective materials,bearing promise for its application in large-scale energy storage.

关键词： Sodium metal batteries Anthraquinone-based cathode Vat dye Indanthrone blue Inorganic electrolytes Liquid ammoniates

Nonlinear numerical assessment of the seismic response of hillside Rc buildings

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 423-440页

作者： Miguel A.gómez Edgar giovanny díaz-Segura Juan carlos Vielma civil Engineering School Pontificia Universidad Católica de ValparaísoValparaíso 2340000Chile

Major damage has been reported in hilly areas after major earthquakes,primarily because of two special conditions:the variation in the seismic ground motion due to the inclined ground surface and the irregularities caused by a stepped base level in the *** aim of this study is to evaluate possible differences in the responses of chilean hillside buildings through numerical linear-elastic and nonlinear *** the first step,a set of response-spectrum analyses were performed on four simplified 2d structures with mean base inclination angles of 0°,15°,30°,and 45°.The structures were designed to comply with chilean seismic codes and standards,and the primary response parameters were *** assess the seismic performance of the buildings,nonlinear static(pushover)and dynamic(time-history)analyses were performed with SeismoStruct *** analyses were used to compare the nonlinear response at the maximum roof displacement and the damage ***-history analyses were performed to assess the nonlinear dynamic response of the structures subjected to seismic ground motions modified by topographic *** consider the topographic modification,acceleration records were obtained from numerical models of soil,which were calculated using the rock acceleration record of the Mw 8.01985 chilean *** differences in the structure responses(roof displacements and maximum element forces and moments)were caused by the topographic effects in the seismic input motion,with the highly predominant ones being the differences caused by the step-back configuration at the base of the *** concentrations of shear forces in short walls were observed,corresponding to the walls located in the upper zone of the foundation *** response of the structures with higher angles was observed to be more prone to fragile failures due to the accumulation of shear *** though hillside buildings gain stiffness in the lower stories,resulting

关键词： topographic effect hillside buildings nonlinear analyses shear-wall buildings

BANcO dE BILBAO HEAdQUARTERS:FIRST LOW-ENERgY BUILdINg IN SPAIN?

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Journal of green Building 2011年第4期6卷 37-44页

作者： césar Martín gómez School of Architecture Installations and Energy Section

Francisco Javier Sáenz de Oíza was perhaps the greatest architect of the twentieth century in Spain,and his masterpiece was the Banco de Bilbao Headquarters,located in the Paseo de la castellana in Madrid(Spain).Sáenz de Oíza was a university professor in the Installations and Energy Areas at the University of *** him,concepts such as indoor comfort,lighting,heat production,cooling,and solar houses were an indispensable part of the student’s learning and,of course,he included them in his building *** applied these concepts in the Banco de Bilbao ***,the purpose of this paper will be to examine the Banco de Bilbao technical knowledge in depth-including its passive architectonical design-and to present the main good decisions(and mistakes)of this first low-energy Spanish building after almost 30 years of intensive use,to extend its lessons for future buildings.

关键词： office building design techniques Sáenz de Oíza façade radiation skyscraper