Results 111 to 120 of about 20,197 (313)

Monosubstituted N‐Arylhydroxylamine Chemistry: Integrating Contemporary Synthetic Approaches for the Efficient Construction of Diverse Heterocyclic Scaffolds

Chemistry – A European Journal, EarlyView.
Monosubstituted N‐arylhydroxylamines represent a unique subclass of hydroxylamines that act as pivotal intermediates in redox transformations and as versatile platforms for further synthetic transformations. They serve as key building blocks in the synthesis of architecturally complex heterocycles and other valuable organic compounds.
Michael G. Kallitsakis, Kyriakos D. Nikopoulos, Ioannis N. Lykakis   +2 more
wiley   +1 more source

Family's socioeconomic and demographic factors on elements of children's dental and oral health: A scoping review

Clinical and Experimental Dental Research, EarlyView.
Abstract Background Family plays a significant role in children's dental and oral health (DOH) elements, such as children's DOH knowledge and practice, the development of children's dental fear and anxiety (DFA), children's dental visits, and children's DOH status.
Wisnu Fadila, Mugia B. Rahardja, Puguh Prasetyoputra, Anne A. Suwargiani, Yanu E. Prasetyo, Eriska Riyanti   +5 more
wiley   +1 more source

How Metallographic Examinations Can Give the Forming Process of Metal Artefacts? The Example of the Hoard Of Farébersviller

EXARC Journal, 2012
The hoard of Farébersviller (Moselle, France) was discovered in 1991 during rescue excavations (See Image above). This set contains 130 "bronze" artifacts, which date to the Late Bronze Age (8th century BC). The technological study of the forming process
Cécile Veber, Michel Pernot
doaj  

Rescue archaeological excavations of the Uzlovoe Severnoe barrow

, 2021
В статье рассматриваются результаты спасательных раскопок кургана Узловое Северное, проведенных осенью 2017 г. Крымским отрядом ИАЭТ СО РАН на территории Республики Крым. Исследованный курган расположен в юго-восточной части Крымского п-ва, в окрестностях г. Феодосия и входил в зону строительства автомобильной трассы «Таврида». В кургане исследовано 38
openaire   +1 more source

El Molí Roig. A third millennium BC settlement in Banyeres de Mariola (l’Alcoià, Alicante, Spain) [PDF]

, 2004
En aquest article presentem els resultats de les dues excavacions arqueològiques d’urgència (anys 1990 i 1993), desenvolupades al jaciment prehistòric del Molí Roig (Banyeres de Mariola, l’Alcoià). D’aquestes es desprén que es tracta d’un extens jaciment
Pascual Beneyto, Josep, Ribera Gomes, Agustí   +1 more
core  

Probability prediction of true‐triaxial compressive strength of intact rocks based on the improved PSO‐RVM model

Deep Underground Science and Engineering, EarlyView.
In this work, we propose an improved particle swarm optimization (PSO) algorithm and develop an improved PSO‐relevance vector machine (RVM) model as a substitute for traditional true‐triaxial testing. The model's high prediction accuracy was validated through comparisons with two other machine learning methods and five three‐dimensional Hoek–Brown type
Qi Zhang, Maohui Wang, Ning Wang, Yixin Shen, Xuzhen He   +4 more
wiley   +1 more source

Geological and geotechnical challenges on the Great Dyke of Zimbabwe and their impact on hardrock pillar design

Deep Underground Science and Engineering, EarlyView.
The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza, Hendrik Grobler, Moshood Onifade, Manoj Khandelwal   +3 more
wiley   +1 more source

Real‐time monitoring of tunnel structures using digital twin and artificial intelligence: A short overview

Deep Underground Science and Engineering, EarlyView.
How artificial intelligence (AI) and digital twin (DT) technologies are revolutionizing tunnel surveillance, offering proactive maintenance strategies and enhanced safety protocols. It explores AI's analytical power and DT's virtual replicas of infrastructure, emphasizing their role in optimizing maintenance and safety in tunnel management.
Mohammad Afrazi, Danial Jahed Armaghani, Hossein Afrazi, Hadi Fattahi, Pijush Samui   +4 more
wiley   +1 more source

Multiple injection techniques to stimulate complex fracture networks in coal reservoirs: A case study on gas disaster reduction of subsurface coal mine in southwest China

Deep Underground Science and Engineering, EarlyView.
An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang, Farui Shi, Jun Lu, Minghui Li, Cunbao Li, Heping Xie   +5 more
wiley   +1 more source

Advancing mine pillar design: Evaluating traditional methods and integrating AI for enhanced stability of pillars in the Great Dyke, Zimbabwe

Deep Underground Science and Engineering, EarlyView.
B1 is bord width 1, B2 is bord width 2, L is the pillar length, W is the pillar width, red color and letter A represent the pillars, and white color and number 1 represent excavated areas. Pstress is the average pillar stress; σv is the vertical component of the virgin stress, MPa; and e is the areal extraction ratio. e = B o B o + B P ${\rm{e}}=\frac{{
Tawanda Zvarivadza, Hendrik Grobler, Peter Apata Olubambi, Moshood Onifade, Manoj Khandelwal   +4 more
wiley   +1 more source