Results 61 to 70 of about 8,087 (211)

Using the HClO4–H2O2 System for Efficient Platinum Leaching: Optimal Conditions and Kinetics

ChemPlusChem, Volume 90, Issue 8, August 2025.
GA: The platinum leaching using HClO4 and H2O2 is studied. For each HClO4 concentration, an H2O2/HClO4 = 2.5 ratio optimizes the kinetics. The best operating conditions are ≈70 °C, [HClO4] 3 m, and [H2O2] 7.2 m. The leaching process is governed by diffusion in the boundary layer and chemical reaction. In this new extraction process, Cl2(g) is generated
Anailda Alvarado‐Gómez, Roberto Pérez‐Garibay, Juan Carlos Fuentes‐Aceituno, Ramón Arellano‐Piña, Daniel Mendieta‐Georges   +4 more
wiley   +1 more source

Comparison of Globorisk, SCORE2, and PREVENT in the Stratification of Cardiovascular Risk and its Relationship with End‐Organ Damage Among Adults With Arterial Hypertension

The Journal of Clinical Hypertension, Volume 27, Issue 8, August 2025.
ABSTRACT Arterial hypertension often coexists with comorbidities that increase vascular damage. Although the primary goal is to reduce cardiovascular risk, the available risk scores can produce varying estimates. Here, we aim to compare the prevalence of cardiovascular risk categories using three equations (Globorisk, SCORE2, and PREVENT) in adults ...
Silvia Palomo‐Piñón, Luis Alcocer, Humberto Álvarez‐López, Ernesto G. Cardona‐Muñoz, Adolfo Chávez‐Mendoza, Enrique Díaz‐Díaz, José Manuel Enciso‐Muñoz, Héctor Galván‐Oseguera, Martin Rosas‐Peralta, Luis Rey García‐Cortés, Moisés Moreno‐Noguez, Neftali Eduardo Antonio‐Villa, the Mexican Group of Experts on Arterial Hypertension   +12 more
wiley   +1 more source

Diversity Hotspots and Vulnerability of Pine Species in the Sierra Madre Occidental, Western Mexico

Ecology and Evolution, Volume 15, Issue 7, July 2025.
The present study employs a modeling approach to examine the current and future distribution of 19 pine species in the Sierra Madre Occidental, Mexico. This was done in order to identify areas with high potential for pine species richness and to determine which species are at risk due to climate change under different projections.
Lizeth Ruacho‐González, José Javier Corral‐Rivas, Jesús Guadalupe González‐Gallegos, M. Socorro González‐Elizondo, Pablito Marcelo López‐Serrano, Jaime Briseño‐Reyes   +5 more
wiley   +1 more source

Advancements in radiocarbon dating: An overview of its impact on Mexican archaeology

Archaeometry, Volume 67, Issue S2, Page S82-S99, July 2025.
Abstract In this article, we provide a concise historical summary tracing the evolution of radiocarbon dating techniques in Mexico and Central America. We explore the contributions of early pioneers who first employed radiocarbon dating methods, leading to the establishment of a Mexican accelerator mass spectrometry laboratory. The study highlights its
Corina Solís, María Rodríguez‐Ceja, Alberto Alcántara‐Chávez, Miguel Ángel Martínez‐Carrillo   +3 more
wiley   +1 more source

Pedology and Plant Provenance Can Improve Species Distribution Predictions of Australian Native Flora: A Calibrated and Validated Modeling Exercise on 5033 Species

Ecology and Evolution, Volume 15, Issue 6, June 2025.
Climate dominates species distribution models. Deserts depend more on soil factors. Higher thresholds improve model accuracy. Integrated models outperform single‐variable ones. Temperate regions show highest species richness. ABSTRACT Species distribution models (SDMs) are valuable tools for assessing species' responses to environmental factors and ...
Farzin Shabani, Mohsen Ahmadi, Niloufar Lorestani, Shazia Bibi, Atefeh Esmaeili, Tessa Lane, Martin F. Breed, John Llewelyn, Craig Liddicoat, Philip Kibet Langat, Bahareh Kalantar, Nadiezhda Ramírez‐Cabral, Pooja Singh, Ricardo Siqueira da Silva, Mohammed Abu‐Dieyeh, Masoud Nazarizadeh, Alessandro Ossola   +16 more
wiley   +1 more source

Estudio de la percepción del ciudadano respecto al turibus en Zacatecas, México

Transitare, 2020
El objetivo de este estudio es analizar desde la Teoría General de Sistemas, la percepción del ciudadano respecto al transporte turístico turibus en el ciudad de Zacatecas, México. La metodología empleada fue el análisis de regresión múltiple.
Luis Ángel Correa García
doaj  

Enhancing Stability of Microwave‐Synthesized Cs2SnxTi1‐xBr6 Perovskite by Cation Mixing

ChemSusChem, Volume 18, Issue 9, May 5, 2025.
This research introduces a microwave radiation synthesis technique for synthesizing Cs2SnxTi1‐xBr6 lead‐free double perovskite powders. By incorporating Sn4+ cations, the stability of the material is improved, particularly at elevated temperatures and outside conditions.
Emmanuel Reyes‐Francis, Beatriz Julián‐López, Carlos Echeverría‐Arrondo, Jhonatan Rodríguez‐Pereira, Diego Esparza, Tzarara López‐Luke, Jaime Espino‐Valencia, Daniel Prochowicz, Iván Mora‐Seró, Silver‐Hamill Turren‐Cruz   +9 more
wiley   +1 more source

Economic evaluation of the impact of cultural tourism in the city of Zacatecas

Investigaciones Geográficas, 2012
This essay has the purpose of evaluating the economic impact of cultural tourism in the city of Zacatecas, giving special emphasis to its historic downtown.
Alejandrina De Sicilia Muñoz
doaj   +1 more source

Late Pleistocene–Holocene environmental fluctuations of southern Chihuahua Desert, Mexico

Journal of Quaternary Science, Volume 40, Issue 4, Page 634-644, May 2025.
ABSTRACT Paleoenvironmental reconstructions from the Mexican Chihuahua Desert based on biological proxies are scarce, creating a gap in our understanding of the ecological responses to climate change in this water‐scarce region. Here, we present a paleoenvironmental reconstruction based on geochemical data and biological proxies such as ostracods and ...
C. M. Chávez‐Lara, N. B. Palacios‐García, K. García‐Macedo, D. Ibarra‐Morales, M. Caballero   +4 more
wiley   +1 more source

Paradojas de la migración internacional y el medio ambiente

Economía, Sociedad y Territorio, 2007
En el presente artículo se analiza la relación entre migración internacional y degradación ambiental, se estudia el caso de Zacatecas. Se identifican tres paradojas: a) factores como la degradación ecológica, la escasez de recursos naturales o la ...
Rodolfo García-Zamora, Óscar Pérez-Veyna, Guillermo Foladori, Raúl Delgado-Wise, Miguel Moctezuma-Longoria, Elivier Reyes-Rivas, Humberto Márquez-Covarrubias, Patricia Rivera-Castañeda   +7 more
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