scholarly journals Characterization of Seismic Responses in Mexico City Using Hilbert-Huang Transform

Geophysics ◽  
2018 ◽  
Author(s):  
Silvia Raquel García Benítez ◽  
Leonardo Alcántara Nolasco
Keyword(s):  
Mexico City ◽  
Seismic Responses ◽  
Hilbert Huang Transform

Characterization of NOx-Ox relationships during daytime interchange of air masses over a mountain pass in the Mexico City megalopolis

2018 ◽  
Vol 177 ◽  
pp. 100-110 ◽  
Author(s):  
J.S. García-Yee ◽  
R. Torres-Jardón ◽  
H. Barrera-Huertas ◽  
T. Castro ◽  
O. Peralta ◽  
...  
Keyword(s):  
Mexico City ◽  
Mountain Pass ◽  
Air Masses

scholarly journals Thermodynamic characterization of Mexico City aerosol during MILAGRO 2006

2007 ◽  
Vol 7 (3) ◽  
pp. 9203-9233 ◽  
Author(s):  
C. Fountoukis ◽  
A. Nenes ◽  
A. Sullivan ◽  
R. Weber ◽  
T. VanReken ◽  
...  
Keyword(s):  
Gas Phase ◽  
Mexico City ◽  
Thermodynamic Equilibrium ◽  
Phase State ◽  
Molar Ratio ◽  
Inorganic Species ◽  
Equilibrium Calculations ◽  
Thermodynamic Equilibrium Model ◽  
Thermodynamic Equilibrium Calculations

Abstract. Fast measurements of aerosol and gas-phase constituents coupled with the ISORROPIA-II thermodynamic equilibrium model are used to study the partitioning of semivolatile inorganic species and phase state of Mexico City aerosol sampled at the T1 site during the MILAGRO 2006 campaign. Overall, predicted semivolatile partitioning agrees well with measurements. PM2.5 is insensitive to changes in ammonia but is to acidic semivolatile species. Semi-volatile partitioning equilibrates on a timescale between 6 and 20 min. When the aerosol sulfate-to-nitrate molar ratio is less than 1, predictions improve substantially if the aerosol is assumed to follow the deliquescent phase diagram. Treating crustal species as "equivalent sodium" (rather than explicitly) in the thermodynamic equilibrium calculations introduces important biases in predicted aerosol water uptake, nitrate and ammonium; neglecting crustals further increases errors dramatically. This suggests that explicitly considering crustals in the thermodynamic calculations are required to accurately predict the partitioning and phase state of aerosols.

Aerosol climatology over the Mexico City basin: Characterization of optical properties

2017 ◽  
Vol 194 ◽  
pp. 190-201 ◽  
Author(s):  
Giovanni Carabali ◽  
Héctor Raúl Estévez ◽  
Mauro Valdés-Barrón ◽  
Roberto Bonifaz-Alfonzo ◽  
David Riveros-Rosas ◽  
...  
Keyword(s):  
Optical Properties ◽  
Mexico City

Characterization of Fluidization Regimes and Their Transition in Gas–Solid Fluidization by Hilbert–Huang Transform

2019 ◽  
Vol 59 (2) ◽  
pp. 883-896 ◽  
Author(s):  
Musango Lungu ◽  
John Siame ◽  
Jingyuan Sun ◽  
Lloyd Mukosha ◽  
Jingdai Wang ◽  
...  
Keyword(s):  
Hilbert Huang Transform

scholarly journals Characterization of non-linear bearings using the Hilbert–Huang transform

2015 ◽  
Vol 7 (4) ◽  
pp. 168781401558212 ◽  
Author(s):  
Arturo González ◽  
Hussein Aied
Keyword(s):  
Hilbert Huang Transform ◽  
Non Linear

Characterization of a 3DOF aeroelastic system with freeplay and aerodynamic nonlinearities – Part II: Hilbert–Huang transform

2019 ◽  
Vol 114 ◽  
pp. 628-643 ◽  
Author(s):  
Michael Candon ◽  
Robert Carrese ◽  
Hideaki Ogawa ◽  
Pier Marzocca ◽  
Carl Mouser ◽  
...  
Keyword(s):  
Aeroelastic System ◽  
Hilbert Huang Transform

Identification and characterization of single use oxo/biodegradable plastics from Mexico City, Mexico: Is the advertised labeling useful?

2020 ◽  
Vol 739 ◽  
pp. 140358
Author(s):  
V.C. Shruti ◽  
Fermín Pérez-Guevara ◽  
Priyadarsi D. Roy ◽  
I. Elizalde-Martínez ◽  
Gurusamy Kutralam-Muniasamy
Keyword(s):  
Mexico City ◽  
Biodegradable Plastics ◽  
Single Use ◽  
Identification And Characterization

Physico-chemical and bacteriological characterization of wastewater from Mexico City

1998 ◽  
Vol 37 (1) ◽  
pp. 1-8 ◽  
Author(s):  
C. Blanca Jiménez ◽  
V. Homero Landa
Keyword(s):  
Mexico City ◽  
Primary Treatment ◽  
Faecal Coliforms ◽  
Filtration Process ◽  
Jar Test ◽  
Helminth Eggs ◽  
Physico Chemical ◽  
International Regulations ◽  
Dose Ranging

This study was designed to characterize the behavior of the wastewater produced by Mexico City after being subjected to a physico-chemical treatment of Al2(SO4)3 and FeCl3 in a jar test simulation of an Advanced Primary Treatment (APT). Special attention was paid to the evaluation of the removal efficiency of suspended solids and of helminth eggs. The effluent thus obtained was first subjected to a simulated filtration process (through a fiberglass filter paper with an opening of 11 μm) and then it was disinfected with the use of two chemicals: sodium hypochlorite (NaOCl) and copper sulphate (CuSO4). The use of both the Al2(SO4)3 (dose ranging from 25 to 40 mg/L) and the FeCl3 (varying from 20 to 40 mg/L) in combination with the filtration process proved to be quite effective in what refers to the removal mechanisms of helminth eggs. The concentrations recorded in each of the effluents fell always below the international regulations for irrigation reuse (<1 org/L as helminth eggs). The removal rates achieved for both coagulants were close to 99%. In what refers to the disinfection accomplished with the use of NaOCl (from 4 to 17 mg/L as Cl2) and CuSO4 (from 3 to 5 mg/L as Cu), it was found to be an excellent supplementary process because less than 1000 CFU/100 mL were recorded and this value satisfies the international recommendations. The treatment as a whole showed removal efficiencies of 45% as COD, 73% SST, 99% helminth eggs, 99.99% faecal coliforms and from 7 to 87% in heavy metals.

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