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Assessment of compressive strength of jet grouting by machine learning

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 102-111页

作者： Esteban Diaz edgar leonardo Salamanca-Medina Roberto Tomas Departamento de Ingeniería Civil Escuela Politécnica SuperiorUniversidad de AlicanteP.O.Box 99E-03080AlicanteSpain

Jet grouting is one of the most popular soil improvement techniques,but its design usually involves great uncertainties that can lead to economic cost overruns in construction *** high dispersion in the properties of the improved material leads to designers assuming a conservative,arbitrary and unjustified strength,which is even sometimes subjected to the results of the test *** present paper presents an approach for prediction of the uniaxial compressive strength(UCS)of jet grouting columns based on the analysis of several machine learning algorithms on a database of 854 results mainly collected from different research *** selected machine learning model(extremely randomized trees)relates the soil type and various parameters of the technique to the value of the compressive *** the complex mechanism that surrounds the jet grouting process,evidenced by the high dispersion and low correlation of the variables studied,the trained model allows to optimally predict the values of compressive strength with a significant improvement with respect to the existing ***,this work proposes for the first time a reliable and easily applicable approach for estimation of the compressive strength of jet grouting columns.

关键词： Jet grouting Ground improvement Compressive strength Machine learning

Numerical Simulation of the Blood Flow through a Brain Vascular Aneurysm with an Artificial Stent Using the SpH Method

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Engineering（科研） 2018年第12期10卷 891-912页

作者： leonardo Di G. Sigalotti Jaime Klapp Karla pedroza edgar Nathal Carlos E. Alvarado-Rodríguez Area of physics of Irreversible processes Department of Basic Sciences Autonomous Metropolitan University-Azcapotzalco (UAM-A) Mexico City Mexico physics Department National Institute of Nuclear Research (ININ) Ocoyoacac Mexico Los Cabos H+ Hospital San José del Cabo Mexico National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez” Mexico City Mexico Departament of Chemical Engineering DCNyE University of Guanajuato Guanajuato Mexico

We present numerical simulations of blood flow through a brain vascular aneurysm with an artificial stent using Smoothed particle Hydrodynamics (SpH). The aim of this work is to analyze how the flow into an aneurysm changes using different stent configurations. The initial conditions for the simulations were constructed from angiographic images of a real patient with an aneurysm. The wall shear stresses, pressure and highest velocity within the artery, and other particular quantities are calculated which are of medical specific interest. The numerical simulations of the cerebral circulation help doctors to determine if the patient’s own vascular anatomy has the conditions to allow arterial stenting by endovascular method before the surgery or even evaluate the effect of different stent structure and materials. The results show that the flow downstream the aneurysm is highly modified by the stent configuration and that the best choice for reducing the flow in the aneurysm is to use a completely extended Endeavor stent.

关键词： Brain Vascular Flow Aneurysms Blood Flow particle Methods Numerical Modeling

Device-associated infection rates, mortality, length of stay and bacterial resistance in intensive care units in Ecuador: International Nosocomial Infection Control Consortium's findings

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World Journal of Biological Chemistry 2017年第1期8卷 95-101页

作者： Estuardo Salgado Yepez Maria M Bovera Victor D Rosenthal Hugo A González Flores leonardo pazmino Francisco Valencia Nelly Alquinga Vanessa Ramirez edgar Jara Miguel Lascano Veronica Delgado Cristian Cevallos Gasdali Santacruz Cristian pelaéz Celso Zaruma Diego Barahona pinto Clínica la Merced Hospital de los Valles International Nosocomial Infection Control Consortium

AIM To report the results of the International Nosocomial Infection Control Consortium(INICC) study conducted in Quito, *** A device-associated healthcare-acquired infection(DAHAI) prospective surveillance study conducted from October 2013 to January 2015 in 2 adult intensive care units(ICUs) from 2 hospitals using the United States Centers for Disease Control/National Healthcare Safety Network(CDC/NHSN) definitions and INICC methods. RESULTS We followed 776 ICU patients for 4818 bed-days. The central line-associated bloodstream infection(CLABSI) rate was 6.5 per 1000 central line(CL)-days, the ventilator-associated pneumonia(VAp) rate was 44.3 per 1000 mechanical ventilator(MV)-days, and the catheterassociated urinary tract infection(CAUTI) rate was 5.7 per 1000 urinary catheter(UC)-days. CLABSI and CAUTI rates in our ICUs were similar to INICC rates [4.9(CLABSI) and 5.3(CAUTI)] and higher than NHSN rates [0.8(CLABSI) and 1.3(CAUTI)]- although device use ratios for CL and UC were higher than INICC and CDC/NSHN's ratios. By contrast, despite the VAp rate was higher than INICC(16.5) and NHSN's rates(1.1), MV DUR was lower in our ICUs. Resistance of A. baumannii to imipenem and meropenem was 75.0%, and of pseudomonas aeruginosa to ciprofloxacin and piperacillin-tazobactam was higher than 72.7%, all them higher than CDC/NHSN rates. Excess length of stay was 7.4 d for patients with CLABSI, 4.8 for patients with VAp and 9.2 for patients CAUTI. Excess crude mortality in ICUs was 30.9% for CLABSI, 14.5% for VAp and 17.6% for CAUTI. CONCLUSION DA-HAI rates in our ICUs from Ecuador are higher than United States CDC/NSHN rates and similar to INICC international rates.

关键词： Ventilator-associated pneumonia Catheter-associated urinary tract infection Healthcare-associated infection Antibiotic resistance Developing countries Intensive care unit Surveillance Central line-associated bloodstream infections Hospital infection

Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals

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Ultrafast Science 2023年第6期3卷 11-16页

作者： Tobias Flöry Vinzenz Stummer Justinas pupeikis Benjamin Willenberg Alexander Nussbaum-Lapping edgar Kaksis Franco V.A.Camargo Martynas Barkauskas Christopher R.phillips Ursula Keller Giulio Cerullo Audrius pugzlys Andrius Baltuška photonics Institute TU WienViennaAustria Department of physics ETH ZurichZurichSwitzerland Istituto di Fotonica e Nanotecnologie-CNR Piazza Leonardo da Vinci 3220133 MilanoItaly Light Conversion Ltd. VilniusLithuania Dipartimento di Fisica Politecnico di MilanoPiazza Leonardo da Vinci 3220133 MilanoItaly Center for physical Sciences&Technology.SavanoriuAve.231 LT-02300 VilniusLithuania.

Femtosecond dual-comb lasers have revolutionized linear Fourier-domain spectroscopy by offering a rapid motion-free,precise,and accurate measurement mode with easy registration of the combs beat note in the radio frequency *** of this technique already found application for nonlinear time-resolved spectroscopy within the energy limit available from sources operating at the full oscillator repetition ***,we present a technique based on time filtering of femtosecond frequency combs by pulse gating in a laser *** gives the required boost to the pulse energy and provides the flexibility to engineer pairs of arbitrarily delayed wavelength-tunable pulses for pump-probe *** a dual-channel millijoule amplifier,we demonstrate programmable generation of both extremely short,fs,and extremely long(>ns)interpulse delays.A predetermined arbitrarily chosen interpulse delay can be directly realized in each successive amplifier shot,eliminating the massive waiting time required to alter the delay setting by means of an optomechanical line or an asynchronous scan of 2 free-running *** confirm the versatility of this delay generation method by measuringχ(2)cross-correlation andχ(3)multicomponent population recovery kinetics.

关键词： amplifier delay repetition