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“雪龙”号是中国最大的极地考察船,也是中国唯一能在极地破冰前行的船只.雪龙船耐寒,能以1.5节航速连续冲破1.2米厚的冰层(含0.2米雪).满载时的排水量为21025吨,自重15000吨.“雪龙”号上的装备也是经常更新换代.下面我们一起来领略下“雪龙”号上的先进设备.1架“雪鹰”号直升机、1艘黄河艇、一艘无人智能测量艇﹣“海巡166﹣01”艇、固定翼飞行机器人、旋翼飞行机器人和冰盖漫游机器人(图为冰盖漫游机器人)3员“大将”组成的机器人兵团、以及多波束声呐、卫星实时动态差分定位系统、磁力仪器等扫测设备,这些设备为“雪龙”号顺利完成极地科考任务保驾护航.

(1)冰盖漫游机器人的四个轮子用四个三角形履带替代,是为了____ 对冰面的压强.

(2)“雪龙”号的最大载重量为____ 吨.

(3)声纳是利用____ 反射来完成定位.

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    Does the future of filmmaking lie in virtual reality (VR) films?

   An ambitious team led by Yale senior Celine Tien might hold the answer to that question.

    Tien produced,directed and acted in Pippa's Pan,which she says is “one of the world's first live-action VR films.”The film,which was completed in April,mixes live action with VR sections.Some of the characters were created via animation(动画)and other techniques that distinguish the film from 360° VR videos like the ones frequently seen on YouTube.

    “360° VR videos are stagnant,which means you don't move with them and see a 360° view of whatever they're filming.”Tien explained.“What we're doing is immersive(沉浸式的)VR.When you put on the goggles (a kind of special glasses) you can physic.ally walk around in the space,pick up objects and engage with the environment.It's a huge difference.”

    The immersive VR film experience is different for everyone who interacts with the medium,but that doesn't mean the film's ending will change for each viewer.

    The film stars two Chinese-speaking actors."It's a love story about a woman suffering from Alzheimer's disease who is trying to bring back memories of her husband,"Tien said.

    The film has already been recognized by the VR industry.After handing in a short demo to the AT&T Developer Summit Conference,Tien and her team were invited to Las Vegas in January,where they came in third place.

    If you're dying to see the film already,your choices area bit limited: Pippa's Pan can't be seen in movie theaters unless they happen to have VR goggles available.According to Tien,many theaters in China will soon have the ability,which makes sense considering China is the film's target market.

    Pippa's Pan will be released in three languages: Chinese,English and Korean.“It can get spread in different ways: at film festivals with VR set ups and through HTC or Oculus headset stores,”Tien says.“If you have VR goggles you can download it and experience it yourself.We will also cooperate with movie theaters that have VR set ups.”