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不完美的奇点

商学院 2014年第10期 116-117页

作者： alvaro marquez 青蛙设计上海工作室

全新数字自我正在快速崛起,旧有的敏感性模拟已经逐渐落后,我们对这种不可避免的整合,悲喜交加,一路推动着传感技术走到了发展的奇点。这是一种非语言的信号,它在很大程度上决定着人类思考和感知的方式。诸如这些表情符号所能传递的信... 详细信息

全新数字自我正在快速崛起,旧有的敏感性模拟已经逐渐落后,我们对这种不可避免的整合,悲喜交加,一路推动着传感技术走到了发展的奇点。这是一种非语言的信号,它在很大程度上决定着人类思考和感知的方式。诸如这些表情符号所能传递的信息与语言同样丰富,某种程度上甚至比语言更容易为人所接受。

关键词：奇点传感技术表情符号非语言信息高度互动心智模式行为科学家社交媒体传感设备应用程序

墨西哥火山带碱性及钙碱性火山作用:活动陆缘与地幔柱有关的岩浆作用及延伸裂谷的例证

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海洋地质动态 1999年第6期15卷 17-19页

作者： alvaro marquez

向东扩延的墨西哥火山带是由钙碱性和大洋岛屿玄武岩（以下简称ＯＩＢ）类火山岩组成的，其成因和演化还是个谜。支持该火山是由于消减作用而产生的主要证据是因为它有着经典板块构造背景，与消减性大洋板块有关（Ｃｏｃｏｓ及Ｒｉｖｅ... 详细信息

向东扩延的墨西哥火山带是由钙碱性和大洋岛屿玄武岩（以下简称ＯＩＢ）类火山岩组成的，其成因和演化还是个谜。支持该火山是由于消减作用而产生的主要证据是因为它有着经典板块构造背景，与消减性大洋板块有关（Ｃｏｃｏｓ及Ｒｉｖｅｒａ板块），而且带内大部分熔岩具备...

关键词：火山带火山作用火山岩地幔柱岩浆作用裂谷

Smoothed particle hydrodynamics based numerical study of hydroplaning considering permeability characteristics of runway surface

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Frontiers of Structural and Civil Engineering 2024年第3期18卷 319-333页

作者： Yang YANG Xingyi ZHU Denis JELAGIN alvaro GUARIN Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China Auto Engineering Research Institute BYD Auto Industry Company LimitedShenzhen 518118China Department of Civil and Architectural Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden

The presence of water films on a runway surface presents a risk to the landing of *** tire of the aircraft is separated from the runway due to a hydrodynamic force exerted through the water film,a phenomenon called *** a lot of numerical investigations into hydroplaning have been conducted,only a few have considered the impact of the runway ***,computational problems,such as excessive distortion and computing efficiency decay,may arise with such numerical models when dealing with the thin water *** paper presents a numerical model comprising of the tire,water film,and the interaction with the runway,applying a mathematical model using the smoothed particle hydrodynamics and finite element(SPH-FE)*** material properties and geometric features of the tire model were included in the model framework and water film thicknesses from 0.75 mm to 7.5 mm were used in the numerical ***,this work investigated the impacts of both surface texture and the runway *** interaction between tire rubber and the rough runway was analyzed in terms of frictional force between the two *** SPH-FE model was validated with an empirical equation proposed by the National Aeronautics and Space Administration(NASA).Then the computational efficiency of the model was compared with the traditional coupled Eulerian-Lagrangian(CEL)*** on the SPH-FE model,four types of the runway(Flat,SMA-13,AC-13,and OGFC-13)were *** simulation of the asphalt runway shows that the SMA-13,AC-13,and OGFC-13 do not present a hydroplaning risk when the runway permeability coefficient exceeds 6%.

关键词： SPH-FE approach hydroplaning numerical simulation surface texture runway surface reconstruction

Multiple scales method for analyzing a forced damped rotational pendulum oscillatorwithgallows

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Communications in Theoretical Physics 2024年第5期76卷 58-67页

作者： Haifa A Alyousef alvaro H Salas B M Alotaibi S A El-Tantawy Department of Physics College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Department of Mathematics and Statistics Universidad Nacional de ColombiaFIZMAKO Research GroupColombia Department of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Research Center for Physics(RCP) Department of PhysicsFaculty of Science and ArtsAl-MikhwahAl-Baha UniversityAl-Baha 1988Saudi Arabia

This study reports the analytical solution for a generalized rotational pendulum system with gallows and periodic excited *** multiple scales method(MSM)is applied to solve the proposed *** types of rotational pendulum oscillators are studied and talked about in *** include the forced damped rotating pendulum oscillator with gallows,the damped standard simple pendulum oscillator,and the damped rotating pendulum oscillator without *** MSM first-order approximations for all the cases mentioned are derived in *** obtained results are illustrated with concrete numerical *** first-order MSM approximations are compared to the fourth-order Runge-Kutta(RK4)numerical ***,the maximum error is estimated for the first-order approximations obtained through the MSM,compared to the numerical approximations obtained by the RK4 ***,we conducted a comparative analysis of the outcomes obtained by the used method(MSM)and He-MSM to ascertain their respective levels of *** proposed method can be applied to analyze many strong nonlinear oscillatory equations.

关键词： rotational pendulum system multiple scales method approximate solution damped oscillations forced pendulum with gallows he-multiple scales method

Alkali and Plasma-Treated Guadua angustifolia Bamboo Fibers:A Study on Reinforcement Potential for Polymeric Matrices

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Journal of Renewable Materials 2024年第8期12卷 1399-1416页

作者： Patricia Luna Juan Lizarazo-Marriaga alvaro Mariño Facultad de Ingeniería Universidad Nacional de ColombiaBogotá11001Colombia Facultad de Ciencias Universidad Nacional de ColombiaBogotá11001Colombia

This study focuses on treating Guadua angustifolia bamboo fibers to enhance their properties for reinforcement applications in composite ***(alkali)and physical(dry etching plasma)treatments were used separately to augment compatibility of Guadua angustifolia fibers with various composite *** influence of these treatments on the fibers’performance,chemical composition,and surface morphology were *** analysis indicated that alkali treatments reduced the tensile modulus of elasticity and strength of fibers by up to 40%and 20%,respectively,whereas plasma treatments maintain the fibers’mechanical *** spectroscopy revealed significant alterations in chemical composition due to alkali treatments,while plasma-treated fibers showed minimal *** examination through Scanning Electron Microscopy(SEM)revealed post-treatment modifications in both cases;alkali treatments served as a cleanser,eliminating lignin and hemicellulose from the fiber surface,whereas plasma treatments also produce rough *** results validate the impact of the treatments on the fiber mechanical performance,which opens up possibilities for using Guadua angustifolia fibers as an alternative reinforcement in composite manufacturing.

关键词： Bamboo fibers Guadua angustifolia alkali treatment dry etching plasma treatment composite reinforcement

Pancreatic neuroendocrine tumors:Are tumors smaller than 2 cm truly indolent?

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World Journal of Gastrointestinal Oncology 2024年第5期16卷 1756-1762页

作者： Sergio Hoyos Pablo Posada-Moreno Natalia Guzman-Arango Romario Chanci-Drago Jaime Chavez alvaro Andrés-Duarte Santiago Salazar-Ochoa Hepatobilary and Liver Transplant Unit Hospital Pablo Tobon Uribe and Gastrohepathology Group Universidad de AntioquiaMedellin 050034AntioquiaColombia Department of General Surgery Universidad Pontificia BolivarianaMedellín 050034AntioquiaColombia

BACKGROUND Pancreatic neuroendocrine tumors(PNETs)are relatively rare but rank as the second most common pancreatic *** can be functional,causing early metabolic disturbances due to hormone secretion,or non-functional and diagnosed later based on tumor size-related *** diagnoses of PNETs under 2 cm in size have sparked debates about their management;some practitioners advocate for surgical removal and others suggest observation due to the tumors’lower potential for ***,it is unclear whether managing these small tumors expectantly is truly *** To evaluate poor prognostic factors in PNETs based on tumor size(>2 cm or<2 cm)in surgically treated *** This cohort study included 64 patients with PNETs who underwent surgical resection between 2006 and 2019 at a high-complexity reference hospital in Medellín,*** assess patient survival,quarterly follow-ups were conducted during the first year after surgery,followed by semi-annual con-sultations at the hospital's hepatobiliary surgery *** variables were described using absolute and relative frequencies,and quantitative variables were expressed using measures of central tendency and their corresponding measures of *** The presence of lymph node involvement,neural involvement,and lymphovascular invasion were all associated with an increased risk of mortality,with hazard ratios of 5.68(95%CI:1.26–25.61,P=0.024),6.44(95%CI:1.43–28.93,P=0.015),and 24.87(95%CI:2.98–207.19,P=0.003),*** involvement and lymphovascular invasion were present in tumors smaller than 2 cm in diameter and those larger than 2 cm in *** recurrence rates between the two tumor groups were furthermore similar:18.2%for tumors smaller than 2 cm and 21.4%for tumors larger than 2 *** survival was additionally comparable between the two tumor *** Tumor size does not dictate prognosis;lymph node and lymphovascular involvement a

关键词： Neuroendocrine tumor Pancreatic neoplasm Pancreas Pancreatic neuroendocrine neoplasm Pancreatic neuroendocrine tumors

Quantum-mechanical effects in photoluminescence from thin crystalline gold films

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Light(Science & Applications) 2024年第4期13卷 783-794页

作者： Alan R.Bowman alvaro Rodríguez Echarri Fatemeh Kiani Fadil Iyikanat Ted V.Tsoulos Joel D.Cox Ravishankar Sundararaman F.Javier García de Abajo Giulia Tagliabue Laboratory of Nanoscience for Energy Technologies(LNET) STIÉcole Polytechnique Fédérale de Lausanne(EPFL)LausanneSwitzerland ICFO–Institut de Ciencies Fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)Spain. MBI–Max-Born-Institut BerlinGermany. POLIMA–Center for Polariton-driven Light–Matter Interactions University of Southern DenmarkOdense MDenmark. Danish Institute for Advanced Study University of Southern DenmarkOdense MDenmark. Department of Materials Science&Engineering Rensselaer Polytechnic InstituteTroyNYUSA. Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNYUSA. ICREA–Institucio Catalana de Recerca i Estudis Avancats BarcelonaSpain

Luminescence constitutes a unique source of insight into hot carrier processes in metals,including those in plasmonic nanostructures used for sensing and energy ***,being weak in nature,metal luminescence remains poorly understood,its microscopic origin strongly debated,and its potential for unraveling nanoscale carrier dynamics largely ***,we reveal quantum-mechanical effects in the luminescence emanating from thin monocrystalline gold ***,we present experimental evidence,supported by first-principles simulations,to demonstrate its photoluminescence origin(i.e.,radiative emission from electron/hole recombination)when exciting in the interband *** model allows us to identify changes to the measured gold luminescence due to quantum-mechanical effects as the gold film thickness is ***,such effects are observable in the luminescence signal from flakes up to 40 nm in thickness,associated with the out-of-plane discreteness of the electronic band structure near the Fermi *** qualitatively reproduce the observations with first-principles modeling,thus establishing a unified description of luminescence in gold monocrystalline flakes and enabling its widespread application as a probe of carrier dynamics and light-matter interactions in this *** study paves the way for future explorations of hot carriers and charge-transfer dynamics in a multitude of material systems.

关键词： luminescence quantum crystalline

Potential role of transmembrane 9 superfamily member 1 as a biomarker in urothelial cancer

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World Journal of Clinical Oncology 2024年第8期15卷 965-967页

作者： alvaro Pinto Abrahams Ocanto Felipe Couñago Department of Medical Oncology University Hospital La PazPaseo Castellana 261Madrid 28046Spain Department of Radiation Oncology GenesisCareHospital Universitario San Francisco de AsísMadrid 28002Spain Department of Radiation Oncology GenesisCareVithas La Milagrosa University HospitalMadrid 28010Spain National Director GenesisCare Madrid 28043Spain

Bladder cancer is a urological tumor with high rates of recurrence despite recent advances in novel *** proteins involved in the molecular mechanisms are currently an enigma,especially the transmembrane 9 superfamily member 1 which has an unclear *** et al published the function and mechanism of this protein,and showed that it could participate in the proliferation,migration and invasion of tumor cells in bladder cancer,therefore treatments directed against this protein may be beneficial in avoiding this condition.

关键词： Bladder cancer Transmembrane 9 superfamily member 1 Biomarker Urothelial cancer Protein

Rainfall Sensitivity to Microphysics and Planetary Boundary Layer Parameterizations in Convection-Permitting Simulations over Northwestern South America

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Journal of Meteorological Research 2024年第4期38卷 805-825页

作者： K.Santiago HERNANDEZ Sebastian GOMEZ-RIOS Juan J.HENAO Vanessa ROBLEDO alvaro RAMiREZ-CARDONA Angela M.RENDON Geolimna Escuela AmbientalFacultad de IngenieriaUniversidad de AntioquiaMedellin 050010Colombia Grupo de Ingenieria y Gestion Ambiental(GIGA) Escuela AmbientalFacultad de IngenieriaUniversidad de AntioquiaMedellin 050010Colombia Division of Atmospheric Sciences Desert Research InstituteRenoNV 89512USA

Convection-permitting modeling allows us to understand mechanisms that influence rainfall in specific ***,microphysics parameterization(MP) and planetary boundary layer(PBL) schemes remain an important source of uncertainty,affecting rainfall intensity,occurrence,duration,and ***,we study the sensitivity of rainfall to three MP [Weather Research and Forecasting(WRF) Single-Moment 6-class(WSM6),Thompson,and Morrison] and two PBL [the Yonsei University(YSU) and Mellor–Yamada Nakanishi Niino(MYNN)] schemes with a convection-permitting resolution(4 km) over northwestern South America(NWSA).Simulations were performed by using the WRF model and the results were evaluated against soundings,rain gauges,and satellite data,considering the spatio-temporal variability of rainfall over diverse regions prone to deep convection in *** and PBL schemes largely influenced simulated rainfall,with better results for the less computationally expensive WSM6 MP and YSU PBL *** rain gauges and satellite estimates,simulations with Morrison MP overestimated rainfall,especially westward of the Andes,whereas the MYNN PBL underestimated precipitation in the Amazon–Savannas *** found that the uncertainty in the rainfall representation is highly dependent on the region,with a higher influence of MP in the Colombian Pacific and PBL in the Amazon–Savannas *** analyzing rainfall-related processes,the selection of both MP and PBL parameterizations exerted a large influence on the simulated lower tropospheric moisture flux and moisture *** schemes significantly influenced the downward shortwave radiation,with MYNN simulating a greater amount of low clouds,which decreased the radiation ***,latent heat fluxes were greater for YSU,favoring moist convection and *** schemes had a marked impact on vertical ***,Morrison MP showed stronger convection and higher precipitation rates,which is assoc

关键词： sensitivity microphysics planetary boundary layer(PBL) Weather Research and Forecasting(WRF) processes