НГУ

Форумы НГУ
Текущее время: Пн июн 25, 2018 9:21 am

Часовой пояс: UTC + 7 часов




Начать новую тему Ответить на тему  [ 1 сообщение ] 
Автор Сообщение
 Заголовок сообщения: PLA Navy frigates introduced to visitors at Port of Antwerp
СообщениеДобавлено: Чт май 10, 2018 1:57 pm 
Не в сети
Постоянный посетитель

Зарегистрирован: Вт апр 03, 2018 8:06 am
Сообщения: 101
NAIROBI, May 16 (Xinhua) -- Kenya' s national football coach Stanley Okumbi on Monday invited Ismail Gonzalez and rising Australia A-League star Bruce Kamau to the East African nation.


The former was included in his preliminary squad of 29 friendly match against Sudan, and Tanzania at the end of the month. Discussions continue to convince the latter his international future lies with Kenya.


Gonzalez, born of a Spanish mother and a Kenyan father, has already agreed to the invitation and is expected to link up with the rest of the Stars squad, when the team assembles for camp.


Kamau, however, remains undecided since the Australia Socceroos have shown some interest in him and is reportedly weighing his options before making a decision after transferring from A-League giants, Adelaide United to Melbourne after the end of the season.


""I think it is important that we have a look at all players available, including the two,"" the national side' s first coach said.


""Talks with Gonzalez have been very positive, while Kamau is yet to make his decision as there is interest for his services elsewhere.


""But we are optimistic that we will have both of them available for selection in the upcoming friendlies,"" he added.


After losing star Liverpool forward, Divock Origi to Belgium, Kenya is keen to snap up the two youngsters as soon as possible.


Kamau and Gonzalez who are both 21 have not yet declared for the senior team in their adopted nations. Enditem

"



SAN FRANCISCO Wholesale Nike Air Huarache Triple White , July 17 (Xinhua) -- U.S. researchers have found that while octopuses, squid and other cephalopods are colorblind, their weirdly shaped pupils may allow them to detect color and mimic the colors of their background.


The researchers, a fatherson team from the University of California, Berkeley Clearance Nike Air Huarache Triple Black , and Harvard University, believe that the key for cephalopods to be able to see color, just differently from any other animal, is an unusual pupil that allows light to enter the eye through the lens from many directions, rather than just straight into the retina.


The U-shaped Womens Nike Air Huarache Run Ultra SE Black Cheap , W-shaped or dumbbell-shaped pupil accentuates the chromatic aberration, and may enable cephalopods to judge color by bringing specific wavelengths to a focus on the retina, much the way animals like chameleons judge distance by using relative focus, said UC Berkeley graduate student Alexander Stubbs. They focus these wavelengths by changing the depth of their eyeball, altering the distance between the lens and the retina Nike Air Huarache Ultra Breathe Black White For Sale , and moving the pupil around to change its off-axis location and thus the amount of chromatic blur.


"We propose that these creatures might exploit a ubiquitous source of image degradation in animal eyes, turning a bug into a feature," Stubbs was quoted as saying by a UC Berkeley news release. "While most organisms evolve ways to minimize this effect, the U-shaped pupils of octopus and their squid and cuttlefish relatives actually maximize this imperfection in their visual system while minimizing other sources of image error, blurring their view of the world but in a color-dependent way and opening the possibility for them to obtain color information."


Alexander Stubbs teamed up with his father Nike Air Huarache Ultra Breathe Triple White Online , Harvard astrophysicist Christopher Stubbs, to develop a computer simulation to model how cephalopod eyes might use this to sense color and published their hypothesis online in the journal Proceedings of the National Academy of Sciences.


The two researchers concluded that a U-shaped pupil like that of squid and cuttlefish would allow the animals to determine the color based on whether or not it was focused on its retina. The dumbbell-shaped pupils of many octopuses work similarly, since they are wrapped around the eyeball in a U shape and produce a similar effect when looking down.


"Their vision is blurry, but the blurriness depends on the color," Stubbs said. "They would be comparatively bad at resolving white objects Nike Air Huarache Ultra Breathe Triple Black Outlet , which reflect all wavelengths of light. But they could fairly precisely focus on objects that are purer colors, like yellow or blue, which are common on coral reefs and rocks and algae. It seems they pay a steep price for their pupil shape but may be willing to live with reduced visual acuity to maintain chromatically-dependent blurring, and this might allow color vision in these organisms."


"We carried out extensive computer modeling of the optical system of these animals, and were surprised at how strongly image contrast depends on color Cheap Womens Nike Air Huarache Run Ultra Br White ," said Harvard's Stubbs. "It would be a shame if nature didn't take advantage of this."


Human and other mammalian eyes have round pupils that contract to pinholes to give us sharp vision, with all colors focused on the same spot. But as anyone who's been to the eye doctor knows, dilated pupils not only make everything blurry, but create colorful fringes around objects, what is known as chromatic aberration. This is because the transparent lens of the eye Womens Nike Air Huarache Ultra Sandals Pink On Sale , which in humans changes shape to focus light on the retina, acts like a prism and splits white light into its component colors. The larger the pupillary area through which light enters, the more the colors are spread out. The smaller our pupil, the less the chromatic aberration.


"We believe we have found an elegant mechanism that could allow these cephalopods to determine the color of their surroundings, despite having a single visual pigment in their retina Womens Nike Air Huarache Ultra Sandals Black Online ," said the younger Stubbs. "This is an entirely different scheme than the multi-color visual pigments that are common in humans and many other animals. We hope this study will spur additional behavioral experiments by the cephalopod community."



JAKARTA, May 24 (Xinhua) -- Three people were reported to be killed and some injured as bombs exploded in Indonesia's capital of Jakarta on Wednesday evening,. Cheap USA Jerseys Cheap Portugal Jerseys Cheap France Jerseys Cheap England Soccer Jerseys Cheap Croatia Soccer Jerseys Cheap Colombia Soccer Jerseys Wholesale Chile Jerseys Wholesale Brazil Jerseys Wholesale Belgium Jerseys Wholesale Argentina Jerseys


Вернуться к началу
 Профиль  
 
Показать сообщения за:  Поле сортировки  
Начать новую тему Ответить на тему  [ 1 сообщение ] 

Часовой пояс: UTC + 7 часов


Кто сейчас на конференции

Сейчас этот форум просматривают: нет зарегистрированных пользователей и гости: 3


Вы не можете начинать темы
Вы не можете отвечать на сообщения
Вы не можете редактировать свои сообщения
Вы не можете удалять свои сообщения
Вы не можете добавлять вложения

Найти:
Перейти:  
Создано на основе phpBB® Forum Software © phpBB Group
Русская поддержка phpBB