Results 151 to 160 of about 2,851,390 (300)

Africa's Growth Tragedy: Policies and Ethnic Divisions

, 1997
W. Easterly, Ross Levine
semanticscholar   +1 more source

A Termite‐Inspired Alternative to Cement

Advanced Functional Materials, EarlyView.
A termite‐inspired composite of clay, cellulose, and lignin forms a dense fibrous network with concrete‐like strength (32 MPa) and superior elasticity, processed at ambient temperature. Abstract Clay combined with organic materials is used by termites as a strong and durable construction material for their mounds with minimal environmental impact. Here,
Oren Regev, Peter Fratzl, Emeline Raguin, Markus Antonietti   +3 more
wiley   +1 more source

Flaxseed Fiber-Structured Nanoemulgels for Salad Dressing Applications: Processing and Stability

Gels
This study aimed to investigate the production of nanoemulgels structured with flaxseed fiber, designed to simulate salad dressings. For this purpose, the influence of microfluidizer passes (from one to four) on physicochemical and rheological properties
María-Carmen Alfaro-Rodríguez, Fátima Vela, María-Carmen García-González, José Muñoz   +3 more
doaj   +1 more source

Coordinated Multi‐Component Gradient Engineering of Catalyst Layers for Advanced Polymer Electrolyte Fuel Cells

Advanced Functional Materials, EarlyView.
This work presents a continuous linear gradient catalyst layer design, a general strategy for improving membrane electrode assemblies across electrochemical devices. Fabricated via a dual‐nozzle spray coating method, the architecture controls the Pt/carbon ratio, ionomer content and ionomer type across the catalyst layer, enhancing proton conduction ...
Shangwei Zhou, Matt P. Tudball, Yiming Guo, Bia Brandt, Adam Zucconi, Wenjia Du, Junfu Bu, Daniel H. C. Wan, Jianuo Chen, Emanuele Magliocca, Feng Ryan Wang, Alexander J.E. Rettie, Patrick S. Grant, Paul R. Shearing, Rhodri Jervis, Thomas S. Miller   +15 more
wiley   +1 more source

A difícil e esquecida questão do Saara Ocidental

Meridiano 47, 2017
O artigo discute a questão do Saara Ocidental, a assim chamada última colônia africana. O objetivo é mostrar o estágio atual da questão e suas perspectivas.
Pio Penna Filho
doaj  

Ultrasonic Processing and Its Impact on the Rheology and Physical Stability of Flaxseed Fiber Dispersions

Applied Sciences
Ultrasonic homogenization is an emerging technique with significant potential to modify the structure and functionality of food ingredients. This study evaluated the effect of ultrasonic homogenization on the rheological behavior and physical stability ...
Maria-Carmen Alfaro-Rodríguez, Maria-Carmen Garcia-González, José Muñoz   +2 more
doaj   +1 more source

El trauma de la violencia colonial en África [PDF]

, 2004
La violencia actual en África posee un componente traumático cuyo origen se sitúa en el pasado colonial. Comprender esas heridas que aún se expanden por las sociedades africanas es el objetivo del presente texto.
Alonso Rocafort, Victor
core   +2 more sources

Photothermal Macroporous Lignin Cryogels for Off‐Grid, Continuous Atmospheric Water Collection via Interlayer Heat Recovery

Advanced Functional Materials, EarlyView.
Photothermal, macroporous lignin‐based cryogels are engineered to convert sunlight into low‐grade heat. Integrated as stacked beds in a drum‐type device, a thin copper interlayer transfers waste heat between beds, enabling interlayer heat recovery and continuous solar cycling.
Jie Yan, Jiqing Lu, Tian Bai, Lin Li, Zhaoxuan Niu, Yiying Yue, Wanli Cheng, Guangping Han, Orlando J. Rojas   +8 more
wiley   +1 more source

La Rivalidad entre Argelia y Marruecos. Un análisis de la ruptura de relaciones diplomáticas de 2021 desde el Derecho Internacional y las Relaciones Internacionales

Paix et Sécurité Internationales
La ruptura de relaciones diplomáticas en agosto 2021 entre Argelia y Marruecos, teniendo como trasfondo el Sahara Occidental, supone la mayor crisis desde sus independencias, en un contexto bilateral marcado por cuestiones territoriales no ...
Paloma González Gómez del Miño
doaj   +1 more source

La crisis en el Norte de África y su impacto en la inmigración irregular a la Unión Europea [PDF]

, 2011
Los procesos de cambio político que se suceden en el Norte de África tienen un impacto inmediato en la inmigración irregular hacia Europa. Una visión desde Frontex. Este análisis se realiza desde la perspectiva del impacto que la crisis en el Norte de
Arias, Gil
core