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時間:2022-08-17 來源:本站 點擊:258次

South Africa detects new COVID******


A baby cries as her mother receives her Pfizer vaccine against COVID-19 in Diepsloot Township near Johannesburg on October 21.。

Scientists in South Africa said on Thursday they had detected a new COVID-19 variant with a large number of mutations, blaming it for a surge in infection numbers.。

The number of daily infections in Africa's hardest-hit country has increased tenfold since the start of the month.。

In response, Britain banned all travel from the country and five other southern African nations as concerns grow about the new variant, which scientists say could be more infectious than Delta and more resistant to current vaccines.。

"Unfortunately we have detected a new variant, which is a reason for concern in South Africa," virologist Tulio de Oliveira told a hastily called news conference.。

The variant, which goes by the scientific label B.1.1.529, "has a very high number of mutations," he said, adding that the World Health Organization may give it a Greek variant name – like the dominant Delta strain – on Friday.。

"It's unfortunately causing a resurgence of infections," he said.。

The variant has also been detected in Botswana and Hong Kong among travelers from South Africa, de Oliveira added.。

The WHO said it is "closely monitoring" the reported variant and is expected to meet on Friday to determine if it should be designated a variant of "interest" or of "concern."

"Early analysis shows that this variant has a large number of mutations that require and will undergo further study," the WHO added.。

'A major threat'

South African Health Minister Joe Phaahla said the variant was of "serious concern" and behind an "exponential" increase in reported cases, making it "a major threat."

The country's daily number of infections hit 1,200 on Wednesday, up from 106 earlier in the month.。

Before the detection of the new variant, authorities had predicted a fourth wave to hit South Africa starting around the middle of December, buoyed by travel ahead of the festive season.。

The government-run National Institute for Communicable Diseases said 22 positive cases of the new variant have been recorded in the country.。

The NICD said the number of detected cases and the percentage testing positive are "increasing quickly" in three of the country's provinces including Gauteng, home to the economic hub Johannesburg and the capital Pretoria.。

A cluster outbreak was recently identified, concentrated at a higher education institute in Pretoria, the NICD added.。

Last year, the Beta variant of the virus first emerged in South Africa, although until now its infection numbers have been driven by Delta, which was originally detected in India.。

South Africa has the highest pandemic numbers in Africa with around 2.95 million cases, of which 89,657 have been fatal.。

10 mutations。

Scientists said the new variant has at least 10 mutations, compared with two for Delta and three for Beta.。

"The concern is that when you have so many mutations, it can have an impact on how the virus behaves," Maria Van Kerkhove, the WHO's technical lead on COVID-19, said at a virtual press briefing.。

"It will take a few weeks for us to understand what impact this variant has on any potential vaccines," she added.。

Neutralizing the variant is "complicated by the number of mutations this variant" contains, said one of the South African scientists Penny Moore.。

"This variant contains many mutations that we are not familiar with," she added.。

The Africa Centres for Disease Control and Prevention said it will soon meet South African experts to discuss the variant.。

"There are so many variants out there but some of them are of no consequence on the trajectory of the epidemic," Africa CDC head John Nkengasong told a news conference on Thursday.。

Over half of Ukrainian children displaced by war: UN******


Ukrainian refugees exit a plane chartered by a Swiss millionaire at Zurich Airport, on March 22, 2022.

More than half of all children in Ukraine have been displaced from their homes since Russia launched its full-scale attack on February 24, the United Nations said Thursday.

"One month of war in Ukraine has led to the displacement of 4.3 million children -- more than half of the country's estimated 7.5 million child population," the UN children's agency Unicef said.

Displaced children make up nearly half of the over 10 million people who have been forced to flee their homes since the invasion began.

More than 1.8 million children have fled Ukraine as refugees, while another 2.5 million are now displaced inside their war-ravaged country, the UN said.

"The war has caused one of the fastest large-scale displacements of children since World War II," Unicef chief Catherine Russell said.

"This is a grim milestone that could have lasting consequences for generations to come," she warned.

"Children's safety, well-being and access to essential services are all under threat from non-stop horrific violence."

Her comments came a month after Russian tanks rolled over the border, bringing a conflict that has already killed thousands of Ukrainian civilians.

The UN human rights office has confirmed that 81 children have been killed in the conflict and 108 injured but acknowledges that the true toll is likely far higher.

The UN has also decried that the conflict is taking a devastating toll on civilian infrastructure and access to basic services.

The World Health Organization has verified 64 attacks on health care, including on hospitals, clinics and ambulances, since the attack began.

And Ukraine's education ministry has reported damage to more than 500 schools and other education facilities, according to Unicef.

The UN children's agency estimated that 1.4 million people now lack access to safe water, while 4.6 million people have limited access to water or are at risk of being cut-off.

"Over 450,000 children aged six to 23 months need complementary food support," it said.

Unicef also cautioned that it is already observing a reduction in vaccination coverage for routine and childhood immunisation, including for measles and polio.

"This could quickly lead to outbreaks of vaccine-preventable diseases especially in overcrowded areas where people are sheltering from the violence," it said.

The UN agency reiterated its appeal for an immediate ceasefire and for the protection of children from harm.

It stressed that essential infrastructure that children depend on, like schools, hospitals and buildings sheltering civilians, "must never come under attack."

"In just a few weeks, the war has wrought such devastation for Ukraine's children," Russell said.

"Children urgently need peace and protection. They need their rights."

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西安江村大墓将角逐 全国十大考古新发现终评******


“江村大墓”外藏坑 新华社发


“江村大墓”出土的陶马 新华社发






  与此同时,我省历届入选全国十大考古新发现的项目建立了一系列考古遗址公园、研学参观基地等,使考古从神秘走向公开,从学术走向大众。如汉阳陵国家考古遗址公园、韩城梁带村芮国遗址博物馆、石峁考古遗址公园、周原国际考古研究基地等依托遗址建立,唐昭陵、澄城刘家洼、高陵杨官寨等,丰富了人们的休闲活动,加深了民众对历史以及文化遗产的认识,切身感受到文化遗产保护的社会价值和深远意义。记者 杨明



锐龙轻薄本谁更值得买?小新 VS MateBook******


  在过去的近一年时间里,联想小新Pro凭借其强悍的性能、更丰富的接口和更持久的续航,重新挽回了不少口碑;同时,联想还将其IdeaPad 700系列划拨到了中高端的YOGA S系列,欲在做工质感上也与MateBook一争高低。而华为也没有就此甘休,本月他们带来了2020款的Matebook 13/14锐龙版,在散热、接口等方面进行了强化和补足。双方的较量结果又会如何呢?

  小新Pro VS MateBook 13

  在13寸轻薄本上,小新Pro和MateBook 13 2020锐龙版可谓各有千秋,二者都有着轻薄的机身,超强的性能释放和全面屏的设计。

  小新Pro13采用了低压处理器,35瓦的散热能力稍弱于Matebook 13的40瓦,但由于低压版能效更高的,二者实际处理性能差别不大,在集显性能和内存频率上小新Pro还略有优势。另外,小新Pro的屏幕的ppi更高,显示更精细;电池容量大,续航表现好;两个全功能USB-C也避免了充电时接口被占用的问题。

  MateBook 13的机身更薄更小巧,且散热效果较前代进步显著;3:2的宽高屏除了使四面边框可以做得更窄外,其纵向显示的内容比16:10屏幕还要多;它的键盘为全尺寸布局,并且键程更长,打字手感更加舒适;采用两脚插头的type-c充电器,不但体积更小,还兼容华为手机快充,便携性很好;对华为手机用户还有多屏协同的生态优势,这代还把一碰传NFC内置到了触控板里;接口也不再是以前的全type-c,而是换成了兼容性更好的1A1C。

  结论:这两款产品都非常不错,但有着各自更为匹配的用户群。小新Pro适合更注重外出使用时的续航或者兼顾游戏的用户,尤其是R7版本集显性能有明显优势。而MateBook 13则有更好的外观和便携性,还有更良好的键盘手感以及多屏协同带来的更高的生产效率,适合更加专注办公的人群,特别对华为中高端手机(支持NFC)的用户来说,更加值得优先考虑。

  YOGA 14S VS MateBook 14

  YOGA 14s曾是同价位14寸锐龙轻薄本中的王者,但Matebook 14锐龙版的发布却使其“荣光黯淡”。

  YOGA 14s虽然也做了窄边框设计,但并没有像小新Pro那样采用宽高屏,而是保持了传统的16:9屏幕。配置上同样可选择低压版R5和R7处理器,支持28W散热,板载最新的LPDDR4X内存,频率高达4266MHz。接口也比较完备,提供分别2个USB-A和USB-C。

  MateBook 14比13显得更均衡全能,并且在同尺寸机型中颇具竞争力。它拥有同价位14寸轻薄本中最强的性能释放,最细腻的2K屏,更适合办公和网页浏览的3:2屏幕比例,而且接口齐全,电池容量大,再加上生态优势,无论追求性能、外观、还是屏幕素质,MateBook 14都会是同价位14寸锐龙轻薄本的最佳选择。

  结论:在最核心的性能释放和屏幕素质上,Matebook 14锐龙版一骑绝尘,YOGA 14s则只有在接口、WiFi6等次要方面稍有优势,更低价位的小新Air14就与之更没法比了。可以说,MateBook 14锐龙版在14寸市场中已经形成“通杀”。





1.俄乌都称战局将有重大突破 顿巴斯之战接近收官?



4.暑期景区夜游人次增长165% 海昌携程共推夜经济2.0产品生态体系

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