Results 11 to 20 of about 89,463 (100)

Assumptions, uncertainty, and catastrophic/existential risk: National risk assessments need improved methods and stakeholder engagement

open access: yesRisk Analysis, Volume 43, Issue 12, Page 2486-2502, December 2023., 2023
Abstract Two key shortcomings of national risk assessments (NRAs) are: (1) lack of justification and transparency around important foundational assumptions of the process, (2) omission of almost all the largest scale risks. Using a demonstration set of risks, we illustrate how NRA process assumptions around time horizon, discount rate, scenario choice,
Matt Boyd, Nick Wilson
wiley   +1 more source

The quadruple/quintuple helix model in entrepreneurial ecosystems: an institutional perspective on the space case study

open access: yesR&D Management, Volume 53, Issue 4, Page 675-694, September 2023., 2023
Although entrepreneurial ecosystems (EEs) have attracted increasing conceptual interest in the academic literature, little research has been conducted on their dynamics regarding the sociotechnological transformations that they undergo. To gain a bigger picture of this process, the theoretical underpinning is lacking. This research aims to address this
Aveline Cloitre   +2 more
wiley   +1 more source

Using the potassium‐argon laser experiment (KArLE) to date ancient, low‐K chondritic meteorites

open access: yesMeteoritics &Planetary Science, Volume 58, Issue 4, Page 591-611, April 2023., 2023
Abstract Several laboratories have been investigating the feasibility of in situ K‐Ar dating for use in future landing planetary missions. One drawback of these laboratory demonstrations is the insufficient analogy of the analyzed analog samples with expected future targets. We present the results obtained using the K‐Ar laser experiment (KArLE) on two
Fanny Cattani   +3 more
wiley   +1 more source

Water Dynamics in Highly Concentrated Salt Solutions: A Multi‐Nuclear NMR Approach

open access: yesChemistryOpen, Volume 11, Issue 6, June 2022., 2022
A multi‐nuclear NMR approach including quadrupolar nuclei is used to monitor water and ions mobility in a series of saturated salt solutions. It is shown that water can preserve a high degree of mobility inside such solutions. The results shed light on water dynamics in highly crowded environments such as phase‐separated cellular compartments enriched ...
Nasrollah Rezaei‐Ghaleh
wiley   +1 more source

Olivine aggregates reveal a complex collisional history of the main group pallasite parent body

open access: yesMeteoritics &Planetary Science, Volume 57, Issue 5, Page 1098-1115, May 2022., 2022
Abstract Olivine aggregates, bodies found in pallasites that consist of olivines with coherent grain boundaries and minor amounts of Fe‐Ni and troilite, likely represent well‐preserved samples of different mantle regions of pallasite parent bodies (PPBs).
Nicolas P. Walte, Gregor J. Golabek
wiley   +1 more source

Characterization of a dszEABC operon providing fast growth on dibenzothiophene and construction of broad‐host‐range biodesulfurization catalysts

open access: yesEnvironmental Microbiology, Volume 24, Issue 4, Page 1946-1963, April 2022., 2022
Summary A new operon for biodesulfurization (BDS) of dibenzothiophene and derivatives has been isolated from a metagenomic library made from oil‐contaminated soil, by selecting growth of E. coli on DBT as the sulfur source. This operon is similar to a dszEABC operon also isolated by metagenomic functional screening but exhibited substantial differences:
Guadalupe Martín‐Cabello   +2 more
wiley   +1 more source

The protein kinase LKB1 promotes self‐renewal and blocks invasiveness in glioblastoma

open access: yesJournal of Cellular Physiology, Volume 237, Issue 1, Page 743-762, January 2022., 2022
LKB1 is both a protumorigenic factor contributing to the maintenance of malignant stem‐like cells and a tumor suppressor repressing the invasive potential of glioblastoma. Abstract The role of liver kinase B1 (LKB1) in glioblastoma (GBM) development remains poorly understood.
Laia Caja   +9 more
wiley   +1 more source

Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes [PDF]

open access: yes, 2011
Asteroid sizes can be directly measured by observing occultations of stars by asteroids. When there are enough observations across the path of the shadow, the asteroid’s projected silhouette can be reconstructed.
J. Ďurech   +11 more
semanticscholar   +1 more source

Algorithms and Almost Tight Results for $$3$$ 3 -Colorability of Small Diameter Graphs [PDF]

open access: yes, 2013
The 3-coloring problem is well known to be NP-complete. It is also well known that it remains NP-complete when the input is restricted to graphs with diameter 4.
George B. Mertzios, Paul G. Spirakis
core   +4 more sources

Experimental Observation of a Calcium Silicon Double Carbonate

open access: yesAngewandte Chemie, Volume 138, Issue 9, 23 February 2026.
High‐pressure and ‐temperature reactions between Ca5(Si2O7)(CO3)2 tilleyite and CO2 carbon dioxide yield the first experimental evidence of the double carbonate Ca2Si(CO3)4 and a new Ca2(C4O10) phase containing tetrahedral [CO4] units. These findings reveal unexpected carbonate chemistry and highlight pathways for carbon incorporation under mantle ...
Benedito Donizeti Botan‐Neto   +6 more
wiley   +2 more sources

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