Results 81 to 90 of about 642,691 (356)

Symmetries in Images on Ancient Seals [PDF]

open access: yes, 2009
We discuss the presence of symmetries in images engraved on ancient seals, in particular on stamp seals. Used to stamp decorations, to secure the containers from tampering and for owner's identification, we can find seals that can be dated from Neolithic
Sparavigna, Amelia Carolina
core   +1 more source

Thermoelectric Modules Incorporating MgAgSb and Mg3(Sb,Bi)2 Synthesized Using a Melting Method

open access: yesAdvanced Engineering Materials, EarlyView.
A scalable synthesis method for a thermoelectric material of MgAgSb is established. A thermoelectric power module of MgAgSb/Mg3(Sb,Bi)2 is fabricated, showing the conversion efficiency of 7.4% at ΔT = 315 K. The performance is comparable to conventional Bi2Te3 modules when they are operated with an air‐cooled heat exchanger.
Kazuo Nagase   +8 more
wiley   +1 more source

Seals of Bishop Henryk of Wierzbna (1301–1319)

open access: yesWrocławski Przegląd Teologiczny, 2020
Did Bishop Henryk of Wierzbna use his seals only for legal and political purposes? Establishing this is the purpose of the article. For this purpose, the extant seals were analysed for the sealed image and legend. When analysing Bishop Henryk’s seals, we
Norbert Jerzak
doaj   +1 more source

Exploring Dipolar Dynamics and Ionic Transport in Metal‐Organic Frameworks: Experimental and Theoretical Insights

open access: yesAdvanced Functional Materials, EarlyView.
In this study, the interplay of dipolar dynamics and ionic charge transport in MOF compounds is investigated. Synthesizing the novel structure CFA‐25 with integrated freely rotating dipolar groups, local and macroscopic effects, including interactions with Cs cations are explored.
Ralph Freund   +6 more
wiley   +1 more source

Ideal Molecular Sieving with a Dense MOF for Helium Upgrading with Highly Diffusion Selective Mixed Matrix Membranes

open access: yesAdvanced Functional Materials, EarlyView.
The separation of Helium gas from natural gas is challenging but highly important. MIL‐116(Ga), a “non‐porous” metal–organic framework is used as a molecular sieve to separate He from CH4. Druse‐like MIL‐116(Ga) particles are integrated into polysulfone mixed matrix membranes.
Ayisha Komal   +10 more
wiley   +1 more source

Trends in pinniped interactions with commercial passenger fisheries vessels in California

open access: yesCalifornia Fish and Wildlife Journal
The resurgence of pinniped populations along the West Coast of the United States, a consequence of the Marine Mammal Protection Act, has resulted in unintended ecological and socio-economic repercussions.
Zachary A. Schakner   +3 more
doaj   +1 more source

Légalité et intégrité de la loi : le rôle des Archives nationales

open access: yesClio@Themis, 2013
The National Archives played a key role in the history of law under the Revolution and the Empire. The institution created by the Revolution was charged with the preservation of the minutes book of the Constituent Assembly that would constitute the C ...
Isabelle Rouge-Ducos
doaj   +1 more source

Leak-rate of seals: comparison of theory with experiment

open access: yes, 2009
Seals are extremely useful devices to prevent fluid leakage. We present experimental results for the leak-rate of rubber seals, and compare the results to a novel theory, which is based on percolation theory and a recently developed contact mechanics ...
  +12 more
core   +1 more source

NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity

open access: yesAdvanced Functional Materials, EarlyView.
This study presents novel anti‐counterfeiting tags with multilevel security features that utilize additional disguise features. They combine luminescent nanosized Ln‐MOFs with conductive polymers to multifunctional mixed‐matrix membranes and powder composites. The materials exhibit visible/NIR emission and matrix‐based conductivity even as black bodies.
Moritz Maxeiner   +9 more
wiley   +1 more source

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