Results 61 to 70 of about 56,452 (295)

Eternal Quest: The Story of the Great Naturalists. Alexander B. Adams. New York: G.P. Putnam\u27s Sons, 1969. 509 pp. $10.95. [PDF]

open access: yes, 2017
Excerpt: Alexander Adams seems, if unconsciously, to be following in the footsteps of Donald Culross Peattie. Like Peattie, he wrote a volume on Audubon and then essayed a biographical survey of a number of important naturalists.
Wilkinson, Ronald S
core   +3 more sources

A Michaelis‐Arbuzov‐Type Pathway to a Protected 2ʹ‐Deoxy‐2ʹ‐Selenomethyl‐Adenosine‐3ʹ,5ʹ‐Phosphoroselenolate Guanosine Dinucleotide for Use in Modified m7G Cap Synthesis

open access: yesChemistry – A European Journal, EarlyView.
Here we report a synthesis of the dinucleotide 4 for a projected future total synthesis of the m7G cap 1. Highlights of the route include: 1) a 3ʹ‐H‐phosphonate/5ʹ‐selenocyanate Michaelis‐Arbuzov coupling to forge the 3ʹ,5ʹ‐phosphoroselenolate; 2) an Amosova reductive selenomethylation to install the 2ʹ‐SeMe; 3) a solid CPR II 5ʹ‐O‐phosphitylation; and
K. Lawrence E. Hale   +2 more
wiley   +1 more source

Negative non-Gaussianity as a salvager for PBHs with PTAs in bounce

open access: yesEuropean Physical Journal C: Particles and Fields
Non-Gaussianity in the primordial curvature perturbation is a crucial element of the early universe due to its significant impact on the primordial black hole (PBH) production.
Sayantan Choudhury   +5 more
doaj   +1 more source

Initiating New Prospects of Rural Science Popularization in the Digital Media Era

open access: yesSHS Web of Conferences, 2014
The development of digital media has brought a new challenge to existing science popularization in the rural areas. In this paper, new experience of rural science popularization on both traditional and digital media in Zhejiang province was introduced ...
Jun Li
doaj   +1 more source

From Near to Far: Maria Short and the Places and Spaces of Science in Edinburgh from 1736 to 1850 [PDF]

open access: yes, 2014
A relatively unknown woman named Maria Theresa Short opened a popular observatory in 1835 in Ed inburgh - a time and place where men of science and property had long failed to make a viable space for astronomy.
Loader, Alison Reiko
core  

ESG Performance Evolution in Retail: A Systematic Review and Meta‐Analysis

open access: yesCorporate Social Responsibility and Environmental Management, EarlyView.
ABSTRACT Environmental, social, and governance (ESG) practices have transformed from peripheral corporate social responsibility initiatives into core strategic imperatives in retail. Despite growing interest, the literature remains fragmented across disciplines and geographic contexts, with no comprehensive sector‐specific analysis examining the ...
Jiyeon Kim, Wooyoung Yang
wiley   +1 more source

Популяризація науки серед іноземних студентів технічних вишів України – один з актуальних напрямів сучасної освіти [PDF]

open access: yes, 2017
The pedagogical conditions of the model form of a modern technical specialist, endowed with professional ethics knowledge through the introduction of a science popularization program are determined.
Lapuzina, O., Lisachuk, Lidiya
core  

A rock brittleness index based on the postpeak energy release rate and damage surface characteristics for brittle hard rock

open access: yesDeep Underground Science and Engineering, EarlyView.
This study examines energy evolution in rock rupture via triaxial direct shear tests, exploring the impact of confining pressure and temperature on fracture surface randomness. A novel energy‐based brittleness index is proposed, validated experimentally, and compared with existing methods for reliability and accuracy.
Biao Wang   +5 more
wiley   +1 more source

Insulator fault feature extraction system of substation equipment based on machine vision

open access: yesIET Networks, EarlyView., 2022
Abstract The artificial intelligence technology and intelligent automation are more and more widely used, the insulators play a supporting and insulating role in the operation of the grid. The use of machine vision inspection technology to detect insulator faults has become an inevitable trend of the times.
Keruo Jiang   +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

open access: yesDeep 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   +5 more
wiley   +1 more source

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