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戴尔G7光碟追逐笔记本京东订房：第8代i7 RTX 20614999元_我的网站

一 |     A team of scientists has discovered a likely explanation for why one may feel exhausted after engaging in intense cognitive work.,In their study, published in the Current Biology last week, the researchers argue that intense cognitive work, when it lasts for several hours, results in the buildup of potentially toxic byproducts in the prefrontal cortex part of the human brain, which then affects a person’s behavior.,“Influential theories suggested that fatigue is a sort of illusion cooked up by the brain to make us stop whatever we are doing and turn to a more gratifying activity,” Mathias Pessiglione of Pitié-Salpêtrière University in Paris, said as quoted in a news release by Cell Press. “But our findings show that cognitive work results in a true functional alteration—accumulation of noxious substances—so fatigue would indeed be a signal that makes us stop working but for a different purpose: to preserve the integrity of brain functioning.”,During the course of their research, the team employed magnetic resonance spectroscopy to monitor the brain chemistry of two groups of people during a workday, with one group performing easy cognitive tasks while the other engaged in more complex mental activities.,Only the latter group ended up exhibiting signs of fatigue, as well as a tendency to favor “options proposing rewards at short delay with little effort,” as the news release put it.,AmericasChild Survives After 7 Minutes Without Blood Flow to Brain During Surgery, US Cardiologist Reveals11 August, 16:41 GMT,Furthermore, members of that group had higher levels of glutamate in the synapses of the prefrontal cortex, leading the researchers to suggest that the accumulation of glutamate “makes further activation of the prefrontal cortex more costly,” and thus a mentally exhaustive workday makes cognitive control more difficult.,Unfortunately, there seems to be no fancy way to deal with this problem other than the tried and tested method that is probably as old as history itself.,“I would employ good old recipes: rest and sleep!” Pessiglione remarked. “There is good evidence that glutamate is eliminated from synapses during sleep.”。1月9日，戴尔G7不久前在CES上宣布，并已在京东预约。i7-8750H/8G/128GSSD/1T HDD/RTX2060版本的预订价格为14999元。

二 | 京东预售版搭载15.6英寸、72%NTSC游戏机、Intel 8 i7 CPU、RTX 2060图形卡、8G内存、128G SSD 1T HDD。

三 | 在外观方面，戴尔G7采用了19.9毫米厚的金属机身、四个插座和四个RGB键盘。

四 | 据报道，戴尔G5 15（5590）/G7 15（7590）/G7 17（7790）是戴尔在CES上发布的三款新型笔记本电脑。CPU是Intel 8代标准电压处理器，16GB内存，图形卡为RTX 2080 MAX-Q，固态硬盘为1TB NVMe。在屏幕侧，可以从模型中看到三个模型的大小。标准分辨率为fhd@60Hz。此外，这三款笔记本都有fhd@144hz版本。两个15.6英寸版本也有UHD（4K）OLED屏幕，400 nit亮度和60 Hz刷新率。目前还不清楚国内是否有OLED版本。北京东戴尔G7（I7-8750H 8G 128GSSD 1T RTX 2060）14999元直连。

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