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Earthquake Engineering and Engineering Vibration 2004年第1期3卷 101-106页

作者： raul j.alonso Mohammad Noori Soheil Saadat Arata MasudaDepartment of Mechanical and System Engineering Kyoto Institute of Technology Matsugasaki Sakyo-ku Mechanical Engineering & Eleetro Optical Systems-MS 368 1362 Brass Mill Road Department of Mechanical & Aerospace Engineering North Carolina State University

Accurate estimation of stiffness loss is a challenging problem in structural health *** this studyorthogonal wavelet decomposition is used for identifying the stiffness loss in a single degree of freedom *** effects of excitation frequency on accuracy of damage detection is *** show that pseudo-aliaseffects caused by the orthogonal wavelet decomposition(OWD),affect damage *** is demonstrated that theproposed approach is sunable for damage detection when the excitation frequency is relatively *** study shows how apriori knowledge about the signal and ability to control the sampling frequency can enhance damage detectability.

关键词： wavelet analysis damage detection structural health monitoring

3D printing of ABS *** of processing and effects of multi-wall and single-wall carbon nanotubes on thermal,mechanical and electrical properties

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journal of Materials Science & Technology 2022年第26期121卷 52-66页

作者： Sithiprumnea Dul Brenda j.alonso Gutierrez Alessandro Pegoretti jaime Alvarez-Quintana Luca Fambri Department of Industrial Engineering and INSTM Research Unit University of TrentoTrento 38123Italy Centro de Investigación en Materiales Avanzados S.C.Unidad MonterreyApodaca 66600Mexico Facultad de Ingeniería Mecánica y Eléctrica Universidad Autónoma de Nuevo LeónAvenida Universidad s/nCiudad UniversitariaSan Nicolás de los Garza 66451México

The following paper reports on a comparative study of the effects of two types of carbon nanotubes,namely multiwall(MWCNT)and single-wall(SWCNT)carbon nanotube,on the properties of 3D-printed parts produced with acrylonitrile-butadiene-styrene(ABS)nanocomposites with various CNT loadings of5-10 wt.%.Quasi-static tensile properties and Vicat softening temperature of 3D-printed parts were enhanced with the increasing CNT *** highest enhancement in tensile properties was observed for the ABS/CNT nanocomposites at 10 wt.%filler loading.3D-printed ABS/SWCNT composites showed higher tensile modulus,better creep stability and higher Vicat ***,the strength of ABS/SWCNT 3D samples is relatively lower than that of ABS/*** addition,3D-printed parts exhibited anisotropic electrical conductive behaviour,which has a conductivity of through-layer of about2-3 orders of magnitude higher than *** highest conductivity of 3D-printed samples reached25.2 S/m,and 9.3 S/m for ABS/MWCNT and ABS/SWCNT composites at 10 wt.%,*** results obtained,*** successful fuse filament fabrication and the consequent electromechanical properties,confirm that these 3D printable nanocomposite could be properly utilized for the production,and application up to about 90°C,of thermoelectric devices and/or resistors for flexible circuits.

关键词： Fuse filament fabrication Conductive polymers Nanocomposites Mechanical properties Creep behavior Resistivity

High-speed silicon photonic electro-optic Kerr modulation

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Photonics Research 2024年第1期12卷 51-60页

作者： jONATHAN PELTIER WEIWEI ZHANG LEOPOLD VIROT CHRISTIAN LAFFORGUE LUCAS DENIEL DELPHINE MARRIS-MORINI GUY AUBIN FARAH AMAR DENH TRAN XINGZHAO YAN CALLUM G.LITTLEjOHNS CARLOS alonso-RAMOS KE LI DAVID j.THOMSON GRAHAM REED LAURENT VIVIEN University Paris-Saclay CNRSCentre for Nanoscience and Nanotechnology(C2N)Palaiseau 91120France University Grenoble Alpes CEALETIGrenoble 38000France Optoelectronics Research Centre Zepler Institute for Photonics and NanoelectronicsFaculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK

Silicon-based electro-optic modulators contribute to easing the integration of high-speed and low-power consumption circuits for classical optical communications and data *** the plasma dispersion modulation,an alternative solution in silicon is to exploit the DC Kerr effect,which generates an equivalent linear electro-optical effect enabled by applying a large DC electric *** some theoretical and experimental studies have shown its existence in silicon,limited contributions relative to plasma dispersion have been achieved in high-speed modulation so *** paper presents high-speed optical modulation based on the DC Kerr effect in silicon PIN *** contributions of both plasma dispersion and Kerr effects have been analyzed in different waveguide configurations,and we demonstrated that the Kerr induced modulation is dominant when a high external DC electric field is applied in PIN ***-speed optical modulation response is analyzed,and eye diagrams up to 80 Gbit/s in NRZ format are obtained under a *** of 30 *** work paves the way to exploit the Kerr effect to generate high-speed Pockels-like optical modulation.

关键词： waveguide dispersion effect

Low-Cost and Biodegradable Thermoelectric Devices Based on van der Waals Semiconductors on Paper Substrates

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Energy & Environmental Materials 2024年第1期7卷 205-210页

作者： Gulsum Ersu Carmen Munuera Federico j.Mompean Daniel Vaquero jorge Quereda jo?o Elias F.S.Rodrigues jose A.alonso Eduardo Flores jose R.Ares Isabel j.Ferrer Abdullah M.Al-Enizi Ayman Nafady Sruthi Kuriakose joshua O.Island Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC) Nanotechnology Group USAL–Nanolab Univesidad de Salamanca GISC Departamento de Física de Materiales Universidad Complutense de Madrid Departamento de Física Aplicada Centro de Investigación y Estudios Avanzados MIRE Group Departamento de Física de Materiales Universidad Autónoma de Madrid Instituto Nicolás Cabrera Universidad Autónoma de Madrid Department of Chemistry College of Science King Saud University Department of Physics and Astronomy University of Nevada Las Vegas

We present a method to fabricate handcrafted thermoelectric devices on standard office paper *** devices are based on thin films of WS2,Te,and BP（P-type semiconductors） and TiS3and TiS2（N-type semiconductors）,depo... 详细信息

关键词： paper-based electronics Seebeck effect semiconductors thermoelectrics van der Waals materials

Mass Production of Cost Effective Systems Based on High Concentration

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Bulk lateral shearing interferometry for spatiotemporal study of time-varying ultrashort optical vortices

第十五届国际光伏科学与工程大会

作者： V.Díaz j.Llvarez j.alonso ISOFOTON ISOFOTON ISOFOTON

＜正＞ ISOFOTON S.A., the Spanish PV manufacturer company, is interested in the exploitation of concentrating photovoltaic. It is actively involved in the industrialization of High Concentration PV （HCPV） at really competitive price （below 2,5€/Wpk for installed systems） when mass production issues are considered. This paper describes very briefly main issues of the high concentration strategy, efforts and considerations for a market penetration. A view of the PV market status is also analyzed taking into account some of the projections for new concepts carried out by authorized institutions.

关键词： Concentrators PV-systems Ⅲ-V Solar Cell

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Photonics Research 2022年第4期10卷 922-931页

作者： Miguel Lopez-Ripa Inigo j.Sola Benjamin alonso Grupo de Aplicaciones del Laser y Fotonica(ALF) Departamento de Fisica AplicadaUniversidad de Salamanca37008 SalamancaSpain

The spatiotemporal measurement of ultrashort laser beams usually involves techniques with complex set-ups or limited by instabilities that are unable to accurately retrieve the frequency-resolved wavefront. Here, we solve these drawbacks by implementing a simple, compact, and ultra-stable spatiotemporal characterization technique based on bulk lateral shearing spectral interferometry using a birefringent uniaxial crystal. We apply it to retrieve complex spatiotemporal structures by characterizing ultrafast optical vortices with constant and time-varying orbital angular momentum. This technique can operate in all the transparency range of the anisotropic elements,enabling the characterization in different spectral ranges like infrared, visible, or ultraviolet.

关键词： ultrashort shearing interferometry

Elenoside increases intestinal motility

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World journal of Gastroenterology 2006年第44期12卷 7143-7148页

作者： E Navarro Sj.alonso R Navarro j Trujillo E jorge Department of Pharmacology Faculty of Medicine University of La Laguna 38071 La Laguna Apdo. 55 Tenerife Canary Islands Spain Department of Medical and Chirurgical Sciences University of Las Palmas Gran Canaria Canary Islands Spain Centro de Productos Naturales y Agrobiologia CSIC Tenerife Canary Islands Spain

AIM： TO study the effects of elenoside, an arylnaphthalene lignan from justicia hyssopifolia, on gastrointestinal motility in vivo and in vitro in rats. METHODS： Routine in vivo experimental assessments were catharsis index, water percentage of boluses, intestinal transit, and codeine antagonism. The groups included were vehicle control （propylene glycol-ethanolplant oil-tween 80）, elenoside （i.p. 25 and 50 mg/kg）, cisapride （i.p. 10 mg/kg）, and codeine phosphate （intragastric route, 50 mg/kg）. In v/tro approaches used isolated rat intestinal tissues （duodenum, jejunum, and ileum）. The effects of elenoside at concentrations of 3.2 ×10^4, 6.4 ×10^4 and 1.2 ×10^3 mol/L, and cisapride at 10^6 mol/L were investigated. RESULTS： Elenoside in vivo produced an increase in the catharsis index and water percentage of boluses and in the percentage of distance traveled by a suspension of activated charcoal. Codeine phosphate antagonized the effect of 25 mg/kg of elenoside. In vitro, elenoside in duodenum, jejunum and ileum produced an initial decrease in the contraction force followed by an increase. Elenoslde resulted in decreased intestinal frequency in duodenum, jejunum, and ileum. The in vitro and in vivo effects of elenoside were similar to those produced by cisapride. CONCLUSION： Elenoside is a lignan with an action similar to that of purgative and prokinetics drugs. Elenoside, could be an alternative to cisapride in treatment of gastrointestinal diseases as well as a preventive therapy for the undesirable gastrointestinal effects produced by opioids used for mild to moderate pain.

关键词： Elenoside Gastrointestinal motility, Smail intestine preparation

MODELING HEADCUT DEVELOPMENT AND MIGRATION IN UPLAND CONCENTRATED FLOWS

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International journal of Sediment Research 2005年第4期20卷 281-294页

作者： Sean j. BENNETT Carlos V. alonso Department of Geography University at Buffalo Buffalo NY 14261-0055 USA USDA-ARS National Sedimentation Laboratory P.O. Box 1157 Oxford MS 38655

On hillslopes and agricultural fields, discrete areas of intense, localized soil erosion commonly take place in the form of migrating headcuts. These erosional features significantly increase soil loss and landscape degradation, yet the unsteady, transient, and migratory habits of headcuts complicate their phenomenological and erosional characterization. Here a unique experimental facility was constructed to examine actively migrating headcuts typical of upland concentrated flows. Essential components of the facility include a deep soil cavity with external drainage, rainfall simulator, capacity for overland flow, and a video recording technique for data collection. Results from these experiments show that: (1) after a short period of adjustment, headcut migration attained a steady-state condition, where the rate of migration, scour hole geometry, and sediment discharge remain constant with time; (2) boundary conditions of higher rates of overland flow, steeper bed slopes, and larger initial headcut heights produced systematically larger scour holes with higher rates of soil erosion; and (3) during migration, the turbulent flow structure within the scour hole remained unchanged, consisting of an overfall nappe at the brink transitioning into a reattached wall jet with two recirculation eddies within the plunge pool. The systematic behavior of headcut development and migration enabled the application of modified jet impingement theory to predict with good success the characteristics of the impinging jet, the depth of maximum scour, the rate of headcut migration, and the rate of sediment erosion. These laboratory data and the analytical formulation can be used in conjunction with soil erosion prediction technology to improve the management of agricultural areas impacted by headcut development and ephemeral gully erosion.

关键词： Soil erosion Headcuts Rills Gullies jet impingement

Micromechanical investigation of granular ratcheting using a discrete model of polygonal particles

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Particuology 2008年第6期6卷 390-403页

作者： Fernando alonso-Marroquín Hans B. Mhlhaus Hans j. Herrmann Earth Systems Science Computational Centre & School of Physical Sciences The University of Queensland Earth Systems Science Computational Centre The University of Queensland Institut fr Baustoffe ETH-HenggerbergZrich

We use a two-dimensional model of polygonal particles to investigate granular ratcheting. Ratcheting is a long-term response of granular materials under cyclic loading, where the same amount of permanent deformation is accumulated after each cycle. We report on ratcheting for low frequencies and extremely small loading amplitudes. The evolution of the sub-network of sliding contacts allows us to understand the micromechanics of ratcheting. We show that the contact network evolves almost periodically under cyclic loading as the sub-network of the sliding contacts reaches different stages of anisotropy in each cycle. Sliding contacts lead to a monotonic accumulation of permanent deformation per cycle in each particle. The distribution of these deformations appears to be correlated in form of vortices inside the granular assembly.

关键词： Granular systems Dynamics and kinematics of rigid bodies Molecular dynamics methods

Maschke Type Theorems for Weak Hopf Quasigroups

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Algebra Colloquium 2020年第2期27卷 213-230页

作者： j.N.alonso Alvarez j.M.Fernández Vilaboa R.González Rodríguez Departamento de Matematicas Vniversidade de Vigo Campus Universitario Lagoas-MarcosendeE-36280 VigoSpain Departamento de Matematicas Universidade de Santiago de Compostela E-15771 Santiago de CompostelaSpain Departamento de Matematica Aplicada II Universidade de Vigo Campus Universitario Lagoas-MarcosendeE-36310 VigoSpain

In this paper we give necessary and sufficient conditions for a comodule magma over a weak Hopf quasigroup to have a total integral,thus extending the theories developed in the Hopf algebra,weak Hopf algebra and non-associative Hopf algebra *** this result we also deduce a version of Maschke’s theorems for right(H,B)-Hopf triples associated to a weak Hopf quasigroup H and a right H-comodule magma B.

关键词： (weak)Hopf algebra (weak)Hopf quasigroup integral Maschke theorem