Results 71 to 80 of about 48,608 (309)

Sustainable Pd‐Catalyzed Aminations “on Dirty Water”

Angewandte Chemie International Edition, EarlyView.
Aminations, done safely yet neat, and therefore, quickly, using low levels of Pd, in “dirty water” that must contain 30% KOH; not NaOH, and not at 5%,10%, 20%, 40%, or 50% KOH. Moreover, no base sensitivity of functional groups! Very cool. Thank you, Nature.
Erfan Oftadeh, Marco Ortiz, Kylee Dismuke Rodriguez, Jonathan Yang, Bruce H. Lipshutz   +4 more
wiley   +1 more source

Induced eddy currents characteristics of coal gangue-based functional concrete in compression process

Meitan kexue jishu
Coal gangue-based cemented structures （CGCS） have been widely used in underground engineering. Due to the complex environment and limited space, there is still no effective method to monitor structural health in under-ground engineering.
Meng XIAO, Feng JU, Zequan HE, Pai NING, Tengfei WANG, Dong WANG   +5 more
doaj   +1 more source

SHPB Test and Microstructure Analysis on Ready-Mixed Concrete in Uniaxial Load and Passive Confining Pressure States

Shock and Vibration, 2019
Ready-mixed concrete has been used as a support in mine roadways, where the impact load of blasting excavation can cause damage to the concrete support of the roadway. However, limited studies are available on the effect of water content, storage period,
Jing-shuang Zhang, Xue-lei Duan, Zi-yan Yang   +2 more
doaj   +1 more source

[View of construction work in progress, construction of the Sydney underground railway, 28 December 1916, 2] [picture].

, 1916
Title supplied by cataloguer.; Photograph has the date printed on it.; Part of the collection: Construction of the Sydney underground railway.; Condition: creased ...

core  

A New Paradigm for Understanding the Rheology and Processability of Poly(p‐Phenylene Terephthalamide) Liquid‐Crystalline Solutions

Journal of Applied Polymer Science, EarlyView.
Kevlar is traditionally modeled as a rigid‐rod polymer, yet rheological behavior deviates from this assumption. The review introduces a novel “twist‐tie” entanglement theory for aramid polymer chains in the nematic liquid crystal state, providing a molecular explanation for deviations from rigid‐rod models. Understanding twist‐tie entanglement dynamics
Emma Egli, Jacob L. Pretko, Christopher W. Seay, Steven R. Lustig   +3 more
wiley   +1 more source

Experimental and simulation studies on damage characteristics, crack development patterns, and strength reduction mechanisms of sandstone under laser irradiation

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
In order to explore the damage characteristics and crack development laws of hard rock under laser irradiation, laser irradiation experiments on sandstone were conducted considering the interaction of three laser parameters: spot diameter, laser power ...
Junjun Liu, Chuo Zhang, Lei Yang, Xuemin Zhou, Jing Xie, Bengao Yang, Zhiqiang He, Mingzhong Gao   +7 more
doaj   +1 more source

[Construction of the Sydney underground railway, conservatorium of music in background, 17 November 1916] [picture].

, 1916
Title supplied by cataloguer.; Photograph has the date printed on it.; Part of the collection: Construction of the Sydney underground ...

core  

Analysis on Energy-saving Lighting Design of the Underground Construction

, 2012
oai:ojs.wcj.usp-pl.com:article/25There are often no windows and lack of natural light in the most of underground space, so lighting design is the most basic for most underground architectural design.
Wu, Feng, Li, Yong, Du, Fang
core   +1 more source

Underground houses - systematic approach toward underground construction of living space

, 2020
The urgent need for energy consumption reduction and trends of global warming leads toward exploring possibilities to “hide” living space from explosion to climate changes as a result of global warming.
Haziri, Arben, Rexhepi, Zejnulla, Mehmeti, Arben, Beqiri, Lulzim, Haziri, Imer, Faiku, Fatmir, Sinani, Besian, Sylejmani, Mimoza, Ibrahimi, Hamide   +8 more
core   +1 more source

Redescription of the Triassic cynodont Cistecynodon parvus and reassessment of its phylogeny

The Anatomical Record, EarlyView.
Abstract Cynodontia is an important subclade of Therapsida that first occurred in the late Permian. It includes extinct subclades which are the non‐mammaliaform cynodonts and Mammaliaformes, with the latter ultimately giving rise to crown mammals. The systematics of non‐mammaliaform cynodonts has been extensively studied and is relatively well‐resolved,
Erin S. Lund, Frederik P. Wolvaardt, Roger M. H. Smith, Jaganmoy Jodder, Julien Benoit   +4 more
wiley   +1 more source