Structural characterizations of dune sand and construction sand of Sidi Slimane and Zaouia El Abidia areas in the Touggourt region in southeast Algeria

2021 ◽  
Vol 14 (22) ◽  
Author(s):  
Sayhia Benchaa ◽  
Rachid Gheriani ◽  
Abderrahim Achouri ◽  
Hamza Bouguettaia ◽  
Mohammed Laïd Mechri
1980 ◽  
Vol 3 (1) ◽  
pp. 15-36
Author(s):  
Grzegorz Rozenberg ◽  
Dirk Vermeir

The concept of metalinearity in ETOL systems is investigated. Some structural characterizations, a pumping lemma and the closure properties of the resulting class of languages are established. Finally, some applications in the theory of L systems of finite index are provided.


2021 ◽  
Vol 1233 ◽  
pp. 130043
Author(s):  
Hua Zhang ◽  
Ting Xu ◽  
Dongdong Li ◽  
Tao Cheng ◽  
Jing Chen ◽  
...  

2021 ◽  
Author(s):  
Rui Liu ◽  
Fangfang Gao ◽  
Jingjing Liu ◽  
Jing Wei ◽  
Lei Hou ◽  
...  

The isolable anionic oxoborane 3 and thioxoborane 4 have been assembled using a 1,2-bis(imino)acenaphthene ligand (Dip-BIAN). Structural characterizations and DFT calculations confirmed that two compounds contain terminal doubly bonded B=E...


Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1326 ◽  
Author(s):  
Amina Othmani ◽  
Aida Kesraoui ◽  
Roberto Boada ◽  
Mongi Seffen ◽  
Manuel Valiente

This paper aims to synthesize hybrid materials with high pollutant-uptake capacity and low costbased based on Luffa cylindrica (L.C) and different percentage of Zn2+ in the presence and absence of alternating current (AC). Physico-chemical, morphological and structural characterizations of the hybrid materials were performed by Boehm method, point zero charge (pHpzc), infrared characterizations (IR), scanning electron microscopy (SEM), energy–dispersive spectroscopyand and X-ray photoelectron spectroscopy. The efficiency of the designed hybrid materials was optimized based on their performance in water depollution. Methylene blue (MB) and industrial textile wastewater were the investigated pollutants models. IR characterizations confirmed the fixation of Zn2+ onto the L.C by the creation of Zn-OH, Zn-O and Zn-O-C bonds. Boehm titration showed that the fixation of Zn2+ onto L.C is accompanied by an increase of the basic functions of its surface and subsequently an increase in the pHpzc. SEM results confirmed the fixation of Zn2+ onto the L.C coupling AC with biosorption showed an increase in the adsorbed amount of MB and speed when adding the 4% of Zn2+ compared to the pure L.C the Qm shifted from 3.22 to 9.84 and 8.81 mg/g, respectively, for hybrid materials synthesized under AC, in absence of AC and pure L.C.


Geomorphology ◽  
1999 ◽  
Vol 29 (3-4) ◽  
pp. 235-249 ◽  
Author(s):  
Patrick P Pease ◽  
Gregory D Bierly ◽  
Vatche P Tchakerian ◽  
Neil W Tindale

2009 ◽  
Vol 28 (24) ◽  
pp. 7015-7024 ◽  
Author(s):  
Maria A. Cinellu ◽  
Laura Maiore ◽  
Giovanni Minghetti ◽  
Fabio Cocco ◽  
Sergio Stoccoro ◽  
...  

2016 ◽  
Vol 112 ◽  
pp. 3048-3056 ◽  
Author(s):  
Allaoua Belferrag ◽  
Abdelouahed Kriker ◽  
Said Abboudi ◽  
Salima Tié Bi
Keyword(s):  

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