はてなキーワード: r and cとは
>> In France, after the new coronavirus was confirmed on January 24, 2020, a lot of harassment and discrimination against Asians occurred . It is aimed at Asians such as Chinese, Korean, Japanese, Vietnamese, Filipino , and taxis and trains that refuse to board Chinese, Korean, Japanese have appeared   ].
In the ranking of the number of infected people in the world, the United States is alone, with 1.34 million people, accounting for more than a quarter of the total infected people of 402 million people as of May 10.
I think that the trilingual diplomacy of Britain has created the situation in the Middle East, where terrorism is frequent nowadays, and has repeatedly carried out wrongdoing by repeatedly discriminating against blacks, Indians, and yellow races.
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"I wrote that first one wrong on purpose, because I wanted you to learn something important. This was for you to know how world out there will treat you. You can see that I wrote RIGHT 9 times, but none of you congratulated me for it; you all laughed and criticized me because of one wrong thing I did.
What plays a invaluable role for our study is descriptions gathered from me about each incident that had happened along them. We were able to obtain a large number of the descriptions, since a winter chill in the air reminded me the divine memories of the days with her. We carefully examined each of them and arranged the incidents into some categories. By combing chronological order and categories of the incidents, we analyzed the emotional changes of me and her.
We propose a simple model that explain the breakup between them, based on the above mentioned analysis. From discussions about the model with some people, the model is considered to be capturing major matters. We also present our attempt to match the model to the existing collection of patterns of the way how once loved people would break up. Even though this attempt is not much succeeded, at least it reveals that what I experienced was quite ordinal breakup.
February With the world going mobile and billions of new devices requiring electrical storage, battery technology is almost certainly due for a renaissance in the near future and recent developments suggest MIT will play a role in the next significant battery technology. Less than a week ago, we reported on work being done by MIT's Laboratory for Electromagnetic and Electronic Systems (LEES) that could become the first technologically significant and economically viable alternative to conventional batteries in 200 years. Now a second new and highly promising battery technology is emerging from MIT - a new type of lithium battery that could become a cheaper alternative to the batteries that now power hybrid electric cars.
Until now, lithium batteries have not had the rapid charging capability or safety level needed for use in cars. Hybrid cars now run on nickel metal hydride batteries, which power an electric motor and can rapidly recharge while the car is decelerating or standing still.
But lithium nickel manganese oxide, described in a paper to be published in Science on Feb. 17, could revolutionize the hybrid car industry -- a sector that has "enormous growth potential," says Gerbrand Ceder, MIT professor of materials science and engineering, who led the project.
The new material is more stable (and thus safer) than lithium cobalt oxide batteries, which are used to power small electronic devices like cell phones, laptop computers, rechargeable personal digital assistants (PDAs) and such medical devices as pacemakers.
The small safety risk posed by lithium cobalt oxide is manageable in small devices but makes the material not viable for the larger batteries needed to run hybrid cars, Ceder said. Cobalt is also fairly expensive, he said.
Scientists already knew that lithium nickel manganese oxide could store a lot of energy, but the material took too long to charge to be commercially useful. The MIT researchers set out to modify the material's structure to make it capable of charging and discharging more quickly.
Lithium nickel manganese oxide consists of layers of metal (nickel and manganese) separated from lithium layers by oxygen. The major problem with the compound was that the crystalline structure was too "disordered," meaning that the nickel and lithium were drawn to each other, interfering with the flow of lithium ions and slowing down the charging rate.
Lithium ions carry the battery's charge, so to maximize the speed at which the battery can charge and discharge, the researchers designed and synthesized a material with a very ordered crystalline structure, allowing lithium ions to freely flow between the metal layers.
A battery made from the new material can charge or discharge in about 10 minutes -- about 10 times faster than the unmodified lithium nickel manganese oxide. That brings it much closer to the timeframe needed for hybrid car batteries, Ceder said.
The lead author on the research paper is Kisuk Kang, a graduate student in Ceder's lab. Ying Shirley Meng, a postdoctoral associate in materials science and engineering at MIT, and Julien Breger and Clare P. Grey of the State University of New York at Stony Brook are also authors on the paper.