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 Geplaatst: 05-09-2018 10:36:54 Onderwerp: Making personalised Christma |
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CAPE TOWN， March 28 (Xinhua) -- South African anti-apartheid activist Ahmed Kathrada died in the early hours of Tuesday morning at the age of 87， the Ahmed Kathrada Foundation has confirmed.
Kathrada passed away peacefully after a short period of illness and following surgery to the brain at the Donald Gordon Hospital in Johannesburg， the foundation said.
"This is great loss to the ANC (African National Congress)， the broader liberation movement and South Africa as a whole. Internationally， he was staunch in his support for the Palestinian struggle. 'Kathy' was an inspiration to millions in different parts of the world，" said Neeshan Balton， Executive Director of the foundation.
Kathrada will be buried according to Muslim religious rights， details of which will be made publicly available in due course， according to the foundation.
Born on Aug. 21， 1929， Kathrada was introduced to politics as a young boy when he joined a non-racial youth club run by the Young Communist League.
At 17， Kathrada participated in the 1946 Passive Resistance Campaign led by the South African Indian Congress. He was part of 2，000 resisters who were arrested and imprisoned for defying a law that discriminated against Indian South Africans.
Kathrada spent 26 years and three months in prison， 18 of which were on Robben Island where Nelson Mandela， who later became South Africa's first black president， was also imprisoned.
Kathrada has had an illustrious political career， having served between 1994 and 1999 as the parliamentary counsellor to then President Mandela.
Kathrada is survived by his wife， Barbara Hogan， also an ANC stalwart and veteran.
LOS ANGELES Hydro Flask 12 OZ Kids Wide Mouth Pas Cher , Oct. 28 (Xinhua) -- A team of researchers in the United States has shown it is possible to improve conductivity and safety in lithium-ion batteries, which are used to power many electronic devices around the world, including laptops, iPods Enfants Hydro Flask Pas Cher , satellites, artificial hearts and cell phones.
The work, by researchers from Virginia Commonwealth University, was detailed in a study published recently in the Proceedings of the National Academy of Sciences.
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Instability in lithium-ion batteries due to liquid-state electrolytes that help carry charges from one battery electrode to another is one hazard scientists can prevent, researchers say.
Despite this instability, compared to more stable solid-state electrolytes, liquid-state electrolytes are commonplace in lithium-ion batteries due to their conductive superiority.
However Hydro Flask Straw Pas Cher , the new theoretical studies has shown it is possible to design solid-state electrolytes not only to be as conductive as their liquid counterparts but also very stable.
Electrolytes, which are central to a battery, are salts composed of positive and negative ions. Positive ions are atoms that have more protons than electrons, while negative ions inversely have more electrons than protons.
In a lithium-ion battery Hydro Flask PNW Pas Cher , positive lithium ions flow between electrodes via electrolytes. Lithium ions can flow freely through liquid-state electrolytes but are less mobile in a solid-state electrolyte, which adversely affects conductivity.
To improve the conductivity in solid-state electrolytes, the researchers produced a computational model in which a single negative ion is removed. Negative cluster ions, groups of atoms with more electrons than protons www.hydroflaskfrance.fr , replace the absent ion.
Originally, the electrolyte, which belongs to a family of crystals called antiperovskites, contained positive ions made of three lithium atoms and one oxygen atom. The positive ions were joined with a single chlorine atom that was a negative ion.
In the computational model Hydro Flask France Pas Cher , the chlorine atom was replaced by a negative cluster ion created by one boron atom and four fluorine atoms joined to the existing positive ions. Other combinations of negative cluster ions were identified to potentially enhance conductivity.
"Replacing the chlorine ion with cluster ions improves conductivity because these ions are larger and allow the lithium ions to move quickly, as if they were in a liquid," said Hong Fang, a postdoctoral fellow in the Department of Physics.
Next Hydro Flask France , researchers are now in search of collaborators to test their computational model in a laboratory setting for eventual lithium-ion battery applications.
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