Results 21 to 30 of about 11,599 (182)

Attack of carbonic anhydride and hydrogen sulfide on API class H cement slurries exposed to saline formation waters

Materiales de Construccion, 2011
This paper discusses the attack of the major ions (sulfate, chloride, and magnesium) and sour gases, present in natural gas (CO2 y SH2), on API class H cement, the type used in gas wells under high pressure and temperature.
G. Márquez, F. J. Alejandre, J. J. Martín-del-Río, R. Arribas, F. J. Blasco   +4 more
doaj   +1 more source

Directional‐DRX for 5G wireless communications

Electronics Letters, 2016
Directional‐discontinuous reception (D‐DRX) is proposed for millimetre‐wave enabled fifth‐generation communications. In addition to conventional active, short‐sleep and long‐sleep states, the proposed mechanism considers a separate beam searching state, to address alignment of directional beams between user equipment (UE) and evolved node B after a ...
Agiwal, M, Maheshwari, MK, Saxena, N, Roy, A   +3 more
openaire   +1 more source

Caracterización mineralógica y elemental de sedimentos sólidos de la laguna de Yantac, departamento de Junín, provincia de Yauli, distrito de Marcapomacocha, por difracción y fluorescencia de rayos X

Revista del Instituto de Investigación de la Facultad de Minas, Metalurgia y Ciencias Geográficas, 2016
Las muestras en estudio fueron extraídas a lo largo de la ribera de la laguna de Yantac-Junín, siendo uno de los objetivos identificar los minerales contaminantes procedentes de la actividad humana (ganadera, agrícola, etc.) y otros.
Biviano Miramira, Luis Vilcapoma, Javier Jacay   +2 more
doaj   +1 more source

Efecto de las nanopartículas de ZrO2 y L-Cys como agentes dopantes de recubrimientos sol-gel de sílice mesoporosa para la protección anticorrosiva de la aleación de magnesio AZ61

Revista de Metalurgia, 2019
Sobre la superficie de la aleación de magnesio AZ61 se aplicaron recubrimientos de sol-gel basados en el precursor GPTMS-TMOS, incluyendo como agentes dopantes L-Cysteína y ZrO2 en diferentes concentraciones.
Leonardo Hernández, Lucien Veleva, Federico R. García-Galván, Juan Carlos Galván   +3 more
doaj   +1 more source

Controlling dynamic recrystallization via modified LPSO phase morphology and distribution in Mg-Gd-Y-Zn-Zr alloy

Journal of Magnesium and Alloys, 2023
Featured initial microstructures of Mg-11Gd-4Y-2Zn-0.5Zr alloy (wt%) were obtained by adjusting temperatures of solid solution and cooling methods, including island intergranular 18R and 14H LPSO phases with low-density stacking faults, differentially ...
Ce Zheng, Shuaifeng Chen, Ming Cheng, Shihong Zhang, Yingju Li, Yuansheng Yang   +5 more
doaj   +1 more source

Correlación entre parámetros químicos, cristalográficos y espectroscópicos en la termometría de grafito aplicada a una aureola de contacto del monzogranito de La Soledad (Andes venezolanos)

Estudios Geologicos, 2017
Muestras de grafito provenientes de una aureola de contacto entre filitas de la Asociación Cerro Azul (Paleozoico) y el Monzogranito de La Soledad en Los Andes venezolanos, fueron estudiadas mediante técnicas químicas (% Carbono inorgánico y distribución
K. Reategui, M. Martínez
doaj   +1 more source

Functional analysis of enhancer elements regulating the expression of the Drosophila homeodomain transcription factor DRx by gene targeting

Hereditas, 2021
Background The Drosophila brain is an ideal model system to study stem cells, here called neuroblasts, and the generation of neural lineages. Many transcriptional activators are involved in formation of the brain during the development of Drosophila ...
Christine Klöppel, Kirsten Hildebrandt, Dieter Kolb, Nora Fürst, Isabelle Bley, Ruth-Jessica Karlowatz, Uwe Walldorf   +6 more
doaj   +1 more source

Investigating the influence of Si on dynamic recrystallization during hot deformation behavior of ultra-high-strength lightweight steel

Journal of Materials Research and Technology, 2023
In this work, we systematically evaluated the effect of Si on the dynamic recrystallization (DRX) during hot deformation behavior of a novel high-strength rolled Medium Mn steel.
Zhenshan Zhang, Chenghao Song, Wenyuan Wu, Haoliang Wang, Zhenzhong Sun   +4 more
doaj   +1 more source

Biodegradable Zn‐Based Implants: Progress, Challenges, and Pathways toward Clinical Translation

Advanced Science, EarlyView.
Exploring biodegradable Zn‐based implants offers a promising pathway to next‐generation biomedical devices with balanced degradation and biocompatibility. A comprehensive overview of biodegradable Zn‐based implants, covering their biological significance, material design principles, and advanced engineering strategies is provided.
Panfeng Zhao, Zhengquan Wang, Hui Yang, Xiyuan Zhang, Hanyuan Liu, Xiaotong Lu, Xiaocheng Li, Yanyan Liu, Xi Zhao, Wenhao Zhou, Yufeng Zheng   +10 more
wiley   +1 more source

Performance Comparison of External Active States for LTE DRX and HD-DRX Scenarios Based on Semi-Markov in 4G and 5G Networks [PDF]

Fayoum University Journal of Engineering
Energy consumption is one of the most vital obstacles which face wireless mobile communications to satisfy the User Equipment (UE) with great multimedia services. Unfortunately, the UE battery energy is more absorbed with higher users' requirements.
Mustafa Sallam, Mohamed Mahmoud
doaj   +1 more source