Control of capillary flow through porous media has broad practical implications. However, achieving accurate and reliable control of such processes by tuning the pore size or by modification of interface wettability remains challenging. Here we propose that the liquid flow by capillary penetration can be accurately adjusted by tuning the geometry of porous media. Methodologies: On the basis of Darcy’s law, a general framework is proposed to facilitate the control of capillary flow in porous systems by tailoring the geometric shape of porous structures. A numerical simulation approach based on finite element method is also employed to validate the theoretical prediction. Findings: A basic capillary component with a tunable velocity gradient is designed according to the proposed framework. By using the basic component, two functional capillary elements, namely, (i) flow accelerator and (ii) flow resistor, are demonstrated. Then, multi-functional fluidic devices with controllable capillary flow are realized by assembling the designed capillary elements. All the theoretical designs are validated by numerical simulations. Finally, it is shown that the proposed concept can be extended to three-dimensional design of porous media
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11.2.2020. "Yrityskauppa on merkittävä investointi kotimaisen, riippumattoman journalismin digitaaliseen tulevaisuuteen. Kaupan tavoitteena on vahvistaa ostettavien lehtien ja Sanoman uutismedialiiketoiminnan kehitystä ja varmistaa kaikkia suomalaisia palveleva elinvoimainen, kotimainen, riippumaton uutismedia myös digitaalisessa toimintaympäristössä. Journalistisen riippumattomuuden varmistaminen myös jatkossa on yrityskaupan keskeinen osa: toimitukset ja uutisbrändit jatkavat itsenäisinä omien päätoimittajiensa johdolla."
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Dive into the world of The Probe, where investigative journalism meets in-depth news analysis. Explore exclusive stories, uncover hidden truths, and gain unparalleled insights into issues of public interest.
On Monday, June 3, the Ukrainian government banned the World Socialist Web Site across the country, issuing an order commanding all internet service providers to block access to the WSWS indefinitely.
The decision to ban the WSWS is a response to the outpouring of support within Ukraine and internationally for Bogdan Syrotiuk, a 25-year-old socialist internationalist who was arrested by the Zelensky regime on April 25 on trumped up charges of “high treason” for writing articles for the WSWS, which SBU prosecutors (Ukraine’s domestic intelligence agency) deceitfully claim is “Russian propaganda.” Syrotiuk and the organization to which he belongs, the Young Guard of Bolshevik-Leninists (YGBL), are Trotskyists and irreconcilable opponents of the US-NATO war against Russia as well as the capitalist government of Vladimir Putin.