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Devitrification process in rapidly solidified Al-Ni-Cu-Nd metallic glass

Journal of Central South University of Technology 2003年第3期10卷 163-167页

作者：肖于德黎文献 D.Jacovkis N.Clavaguera m.T.Clavaguera-mora J.rodriguez-Viejo College of materials Science and Engineering Central South University Changsha 410083 China Grup de Fisica de Materials I Departament de FisicaUniversitat Autonoma de Barcelona 08193 Bellaterra Spain Fisica de l'Estat Solid Facultat de Fisica Universitat de BarcelonaDiagonal 647 08028 Barcelona Spain College of materials Science and Engineering Central South University Changsha 410083 China Grup de Fisica de materials I Departament de Fisica Universitat Autonoma de Barcelona 08193 Bellaterra Spain Fisica de l'Estat Solid Facultat de Fisica Universitat de Barcelona Diagonal 647 08028 Barcelona Spain)

In the present study, rapidly solidified ribbons of Al87 Ni7Cu3 Nd3 metallic glass was prepared by usingmelt spinning. Devitrification process of the totally amorphous ribbons was investigated by high temperature X-raydiffraction analysis, combining with differential scanning calorimetry, under continuous and isothermal heating re-gime. The X-ray diffraction intensity and full width at the half maximum (FWHm) were analyzed to investigate theincrease of crystallized amount and growth of α-Al crystal particles. The results show that under continuous heatingregime, the metallic glass devitrifies via two main stages: primary crystallization, resulting in two-phase mixture ofα-Al plus residual amorphous phase, and secondary crystallization, corresponding to rapid precipitation of some in-ter-metallic phases in the form of dispersion or eutectic mixture. Under isothermal heating regime, only Al crystalprecipitates from the Al-rich amorphous matrix at low temperature, and when heating at 280 ℃ only Al crystal pre-cipitates within a short time, and then Al8 Cu4 Nd forms, followed by Al3 Ni, in the residual amorphous phase. Whenheating at higher temperature or for longer time, Aln Nd3 forms, the amorphous phase disappears, and the ribbonsdevelop into polycrystalline morphologies with multiply phase mixture of a-Al, Al8 Cu4 Nd, Al3 Ni, and Al11 Nd3.

关键词： rapid solidification Al-rich amorphous alloy devitrification process phase transformation

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Homotypic Vacuole Fusion Requires VTI11 and Is Regulated by Phosphoinositides

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molecular Plant 2014年第6期7卷 1026-1040页

作者： Sang Won Han maria Fernanda rodriguez-Welsh marcela Rojas-Pierce Department of Plant and microbial Biology North Carolina State University Raleigh NC 27695 USA

most plant cells contain a large central vacuole that is essential to maintain cellular turgor. We report a new mutant allele of VTI11 that implicates the SNARE protein VTI11 in homotypic fusion of protein storage and lytic vacuoles. Fusion of the multiple vacuoles present in vtill mutants could be induced by treatment with Wortmannin and LY294002, which are inhibitors of Phosphatidylinositol 3-Kinase （PI3K）. We provide evidence that Phosphatidylinositol 3-Phosphate （Ptdlns（3）P） regulates vacuole fusion in vtill mutants, and that fusion of these vacuoles requires intact microtubules and actin filaments. Finally, we show that Wortmannin also induced the fusion of guard cell vacuoles in fava beans, where vacuoles are naturally fragmented after ABA-induced stomata closure. These results suggest a ubiquitous role of phosphoinositides in vacuole fusion, both during the development of the large central vacuole and during the dynamic vacuole remodeling that occurs as part of stomata movements.

关键词： vacuole SNARE phosphoinositides membrane fusion Wortmannin.

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OTB-morph:One-time Biometrics via morphing

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machine Intelligence Research 2023年第6期20卷 855-871页

作者： mahdi Ghafourian Julian Fierrez Ruben Vera-rodriguez Aythami morales Ignacio Serna Biometrics and Data Pattern Analytics Laboratory(BiDA Lab) Universidad Autonoma de MadridMadrid28049Spain

Cancelable biometrics are a group of techniques to transform the input biometric to an irreversible feature intentionally using a transformation function and usually a key in order to provide security and privacy in biometric recognition *** transformation is repeatable enabling subsequent biometric *** paper introduces a new idea to be exploited as a transformation function for cancelable biometrics aimed at protecting templates against iterative optimization *** proposed scheme is based on time-varying keys(random biometrics in our case)and morphing *** experimental implementation of the proposed scheme is given for face *** results confirm that the proposed approach is able to withstand leakage attacks while improving the recognition performance.

关键词： Biometrics face recognition template protection morphing security

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Silk-ELR co-recombinamer covered stents obtained by electrospinning

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Regenerative Biomaterials 2019年第1期6卷 21-28页

作者： m.Putzu F.Causa manuel Parente Israel Gonza´lez de Torre J.C.rodriguez-Cabello P.A.Netti Dipartimento di Ingegneria Chimica dei Materiali e della Produzione Industriale(DICMAPI)University“Federico II”Piazzale Tecchio 8080125 NaplesItaly Interdisciplinary Research Centre on Biomaterials(CRIB) University of Naples Federico IIPiazzale Tecchio 8080125 NapoliItaly Center for Advanced Biomaterials for Health Care@CRIB Istituto Italiano di TecnologiaLargo Barsanti e Matteucci 5380125 NapoliItaly Conic Vascular via Carlo Maderno 236901 LuganoSwitzerland Technical Proteins NanoBioTechnology S.L. Edificio CTTAPaseo de Belen9A47011 ValladolidSpain Networking Research Center on Bioengineering Biomaterials and Nanomedicine(CIBER-BBN)ValladolidSpain Bioforge Lab University of ValladolidEdificio LUCIAPaseo de Belen1947011 ValladolidSpain

In the field of tissue engineering the choice of materials is of great importance given the possibility to use biocompatible polymers produced by means of biotechnology.A large number of synthetic and natural materials have been used to this purpose and processed into scaffolds using Electrospinning *** materials that could be used for the fabrication of scaffold and degradable membranes,natural polymers such as collagen,elastin or fibroin offer the possibility to design structures strictly similar to the extracellular matrix(ECm).Biotechnology and genetic engineering made possible the advent of a new class of biopolymers called protein-based *** example is represented by the silk-elastin-proteins that combine the elasticity and resilience of elastin with the high tensile strength of silk-fibroin and display engineered bioactive *** this work,we use electrospinning technique to produce a fibrous scaffold made of the corecombinamer *** fibres have been characterized from the morphological point of *** and morphology have been explored using Scanning Electron microscopy.A thorough study regarding the influence of Voltage,flow rate and distance have been carried out to determine the appropriate parameters to obtain the fibrous mats without defects and with a good distribution of *** has also been in vitro *** the first time we use the co-recombinamer Silk-ELR for the fabrication of a 2.5 angioplasty balloon *** structure could be useful as a coated scaffold for the regeneration of intima layer of vessels.

关键词： electrospinning silk elastin-like-recombinamers tissue engineering

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Parametrization of mean Radiative Properties of Optically Thin Steady-State Plasmas and Applications

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Communications in Computational Physics 2014年第8期16卷 612-631页

作者： R.rodriguez G.Espinosa J.m.Gil J.G.Rubiano m.A.mendoza P.martel E.minguez Departmento de Fisica Universidad de Las Palmas de Gran Canaria35017Spain. Instituto de Fusion Nuclear Universidad Politecnica de Madrid28006MadridSpain.

Plasma radiative properties play a pivotal role both in nuclear fusion and *** are essential to analyze and explain experiments or observations and also in radiative-hydrodynamics *** computation requires the generation of large atomic databases and the calculation,by solving a set of rate equations,of a huge number of atomic level populations in wide ranges of plasma *** facts make that,for example,radiative-hydrodynamics in-line simulations be almost *** has lead to develop analytical expressions based on the parametrization of radiative ***,most of them are accurate only for coronal or local thermodynamic *** this work we present a code for the parametrization of plasma radiative properties of mono-component plasmas,in terms of plasma density and temperature,such as radiative power loss,the Planck and Rosseland mean opacities and the average ionization,which is valid for steady-state optically thin plasmas in wide ranges of plasma densities and ***,we also present some applications of this parametrization such as the analysis of the optical depth and radiative character of plasmas,the use to perform diagnostics of the electron temperature,the determination of mean radiative properties for multicomponent plasmas and the analysis of radiative cooling instabilities in some kind of experiments on high-energy density laboratory ***,to ease the use of the code for the parametrization,this one has been integrated in a user interface and brief comments about it are presented.

关键词： Parametrization of plasma radiative properties and applications steady-state collisional-radiative model optically thin mono-and multi-component plasmas.

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Novel Fast Operating moving Coil Actuator with Compensation Coil for HVDC Circuit Breakers

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CSEE Journal of Power and Energy Systems 2021年第5期7卷 1041-1050页

作者： Boyuan Yin Xianwu Zeng John F.Eastham Damian Vilchis-rodriguez Xiaoze Pei Department of Electronic&Electrical Engineering.University of Bath.Bath.United Kingdom Department of mechanical Engineering University of Bath.Bath.United Kingdom. Power and Energy Division School of Electrical and Electronic EngineeringThe University of ManchesterManchester M139PLUnited Kingdom.

DC circuit breakers are major enabling components for multi-terminal HVDC *** key design targets are operating speed and *** paper proposes a novel moving coil actuator using a compensation coil topology to operate mechanical circuit *** topology aims to significantly improve the magnetic field saturation and reduce the system inductance,so that the operating speed is *** possible connection methods for the compensation coils are proposed and analyzed using finite element modeling,ensuing simulation results are compared and *** operating speed of the moving coil actuator with compensation coils is significantly improved compared with the original moving coil *** moving coil actuator with compensation coils can open a distance of 5 mm within 2.8 ms and the peak efficiency is 47%.

关键词： Compensation coil DC circuit breaker HVDC mechanical circuit breaker moving coil actuator

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Paclitaxel-loaded hollow-poly（4-vinylpyridine） nano- particles enhance drug chemotherapeutic efficacy in lung and breast cancer cell lines

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Nano Research 2017年第3期10卷 856-875页

作者： Rafael Contreras-Caceres maria C. Leiva Raul Ortiz Amelia Diaz Gloria Perazzoli miguel A.Casado-rodriguez Consolacion melguizo Jose m. Baeyens Juan m. Lopez-Romero Jose Prados Department of Organic Chemistry Faculty of Science University of Mdlaga 29071 Malaga Spain Institute of Biopathology and Regenerative medicine (IBImER) Center of Biomedical Research (CIBM) University of Granada 18100 Granada Spain Department of Anatomy and Embryology Faculty of Medicine University of Granada 18071 Granada Spain Biosanitary Institute of Granada (IBS. GRANADA) SAS-Universidad de Granada 18014 Granada Spain Department of Health Science University of Jaen 23071 Jadn Spain Department of Pharmacology Institute of Neuroscience Biomedical Research Center (CIBM) University of Granada 18100 Granada Spain

Paclitaxel （PTX）, one of the most effective cytotoxins for the treatment of breast and lung cancer, is limited by its severe side effects and low tumor selectivity. In this work hollow-poly（4-vinylpyridine）（hollow-p4VP） nanoparticles （NPs） have been used for the first time to generate PTX@p4VP NPs, employing a novel technique in which a gold core in the center of the NP is further oxidized to produce the hollow structure into which PTX molecules can be incorporated. The hollow-p4VP NPs exhibit good physicochemical properties and displayed excellent biocompatibility when tested on blood （no hemolysis） and cell cultures （no cytotoxicity）. Interestingly, PTX@p4VP NPs significantly increased PTX cytotoxicity in human lung （A-549） and breast （mCF-7） cancer cells with a significant reduction of PTX ICs0 （from 5.9 to 3.6 nm in A-549 and from 13.75 to 4.71 nm in mCF-7）. In addition, PTX@p4VP caused a decrease in volume of A-549 and mCF-7 multicellular tumor spheroids （mTS）, an in vitro system that mimics in vivo tumors, in comparison to free PTX. This increased antitumoral activity is accompanied by efficient cell internalization and increased apoptosis, especially in lung cancer mTS. Our results offer the first evidence that hollow- p4VP NPs can improve the antitumoral activity of PTX. This system can be used as a new nanoplatform to overcome the limitations of current breast and lung cancer treatments.

关键词： paclitaxel poly(4-vinylpyridine)(p4VP) nanoparticles lung cancer breast cancer cytotoxicity multicellular tumorspheroids

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Acetosolv delignification of marabou (Dichrostachys cinerea) wood with and without acid prehydrolysis

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Forestry Studies in China 2011年第1期13卷 64-70页

作者： Venkata Prabhakar SOUDHAm Dani rodriguez George J m ROCHA mohammad J TAHERZADEH Carlos mARTIN Bioresource Technology Group Department of Chemistry and Chemical EngineeringUniversity of Matanzas School of Engineering University of Bors Department of Biotechnology Lorena School of EngineeringUniversity of So Paulo

The chemical composition of marabou（Dichrostachys cinerea） wood and its treatment with acetic acid were *** different treatment approaches,direct acetosolv and combined acid prehydrolysis/acetosolv,were *** effects of acetic acid concentration（50%,70% and 90%） and temperature（normal boiling temperature and 121°C） on yield of solids,solubilization of lignin and hemicelluloses and recovery of cellulose were evaluated for both *** solubilization of marabou components was observed in the direct acetosolv treatment at 121°C,especially at the highest acetic acid concentration,where around 84.8% of lignin and 78% of hemicelluloses were *** the material was subjected to acid prehydrolysis prior to acetosolv treatment,lignin solubilization was improved,especially at low acetic acid *** 80% of the solubilized lignin was recovered from the liquors in the direct acetosolv treatment,but the recovery was lower in the combined *** was well preserved in all the treatment schemes.

关键词： Dichrostachys cinerea delignification acetosolv acid hydrolysis

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Structure of a cereal purple acid phytase provides new insights to phytate degradation in plants

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Plant Communications 2022年第2期3卷 52-61页

作者： Raquel Faba-rodriguez Yinghong Gu melissa Salmon Giuseppe Dionisio Henrik Brinch-Pedersen Charles A.Brearley Andrew m.Hemmings School of Chemistry University of East AngliaNorwich Research ParkNorwich NR47TJUK School of Biological Sciences University of East AngliaNorwich Research ParkNorwich NR47TJUK Department of Agroecology Research Center FlakkebjergAarhus University4200 SlagelseDenmark College of Food Science and Technology Shanghai Ocean UniversityShanghai 201306China

Grain phytate,a mixed metal ion salt of inositol hexakisphosphate,accounts for 60%–80%of stored phosphorus in plants and is a potent antinutrient of non-ruminant animals including *** neofunctionalization of purple acid phytases(PAPhy),some cereals such as wheat and rye have acquired particularly high mature grain phytase *** PAPhy activity supplies phosphate,liberates metal ions necessary for seedling emergence,and obviates antinutrient effects of phytate,its manipulation and control are targeted crop *** we show the X-ray crystal structure of the b2 isoform of wheat PAPhy induced during *** high-resolution crystal structure suggests a model for phytate recognition that,validated by molecular dynamics simulations,implicates elements of two sequence inserts(termed PAPhy motifs)relative to a canonical metallophosphoesterase(mPE)domain in forming phytate-specific substrate specificity *** motifs are well conserved in PAPhys from monocot cereals,enzymes which are characterized by high specificity for *** by mutagenesis,residues His229 in PAPhy motif 4 and Lys410 in the mPE domain,both conserved in PAPhys,are found to strongly influence phytase *** results explain the observed phytase activity of cereal PAPhys and open the way to the rational engineering of phytase activity in planta.

关键词： wheat purple acid phytase X-ray crystallography stereospecificity

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A System Identification-based modeling Framework of Bidirectional DC-DC Converters for Power Grids

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Journal of modern Power Systems and Clean Energy 2022年第3期10卷 788-799页

作者： Gabriel E.mejia-Ruiz mario R.A.Paternina Juan R.rodriguez R. Juan m.Ramirez Alejandro Zamora-mendez Guillermo Bolivar-O. Department of Electrical Engineering National Autonomous University of Mexico(UNAM)Mexico CityMexico Department of Electrical Engineering Center for Research and Advanced Studies(CINVESTAV)GuadalajaraMexico Electrical Engineering Faculty Michoacan University of Saint Nicholas of Hidalgo(UMSNH)MoreliaMexico Engineering Faculty Corporacion Universitaria Minuto de Dios-UNIMINUTOBelloColombia

This paper proposes a system identification framework based on eigensystem realization to accurately model power electronic *** proposed framework affords an energy-based optimal reduction method to precisely identify the dynamics of power electronic converters from simulated or actual raw data measured at the converter’s *** method does not require any prior knowledge of the topology or internal parameters of the converter to derive the system modal *** accuracy and feasibility of the proposed method are exhaustively evaluated via simulations and practical tests on a software-simulated and hardware-implemented dual active bridge(DAB)converter under steady-state and transient *** various comparisons with the Fourier series-based generalized average model,switching model,and experimental measurements,the proposed method attains a root mean square error(RmSE)of less than 1%with respect to the actual raw ***,the computational effort is reduced to 1/8.6 of the Fourier series-based model.

关键词： Dual active bridge eigensystem realization algorithm generalized average model power electronic converter identification

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