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约找到 159 条结果,耗时 0.252 秒
遥控气球
立棍
13年4个月前
发表于
极客DIY
内容:点击此处查看视频哇 这个名为Air Swimmers的遥控玩具鱼也太高级了吧~鱼做得惟妙惟肖,尾巴还能摇摆,身体里是惰性气体
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,非常安全,有可爱的小丑鱼和凶猛的大鲨鱼两种可选,售价28.99美元。
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jiang248660720
10年6个月前
回复于
电磁炮
内容:据说可以用
氦气
等 容易离子化的气体填充轨道,通过等离子体导电,可以提高效率
回 5楼(我说要有光) 的帖子
蛋蛋
12年7个月前
回复于
喷气推进
内容:
氦气
比氢气安全,氢气万一爆炸了,就杯具了 [s:225] [s:104] [s:243] [s:242]
谷歌气球,飘到哪里,哪有WIFI。
lread
11年4个月前
回复于
极客DIY
内容:不知道
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球通信在中国怎么样?
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拔刀斋
11年2个月前
回复于
航空技术
内容:虎哥 发表于 2013-8-8 22:52 氢气可不是没人敢用,事实上天上飞的几乎都是氢气的,虽然国家禁止商用气球采用氢气,但是如果用真的
氦气
...有没有试过用氖气?
拆:HPGe(高纯锗)伽玛 能谱 探测器
RodTech
8年7个月前
回复于
核技术与核仪器
内容:不能充
氦气
什么的吗?
自D飞艇,瞎折腾了1个月,估计还得2个月随后跟进
悠闲的晶
11年4个月前
回复于
极客DIY
内容:能不能在制作泡沫塑料的时候把里面填充的气体换成
氦气
,这样泡沫塑料直接能飘起来了。
真空浮球
婺源寻芳
13年4个月前
回复于
极客DIY
内容:还不如用
氦气
当支架。
氢气球航拍地球的问题
HCN
6年2个月前
回复于
航空技术
内容:这里的爆炸指的是物理爆炸不是氢气燃烧爆炸,用
氦气
结果是一样的,到达一定高度一样会被撑爆。
个人实验室展示
虎哥
4年7个月前
回复于
化学
内容:
氦气
瓶子要把胶圈装上。
中科科仪溅射离子泵拆解
justinpiggy
5年6个月前
回复于
拆机鉴赏
内容:所以钛泵是抽不了
氦气
的,因为钛无法和
氦气
反应。
大型飞艇可用于未来低成本高可靠发射火箭
我说要有光
13年0个月前
回复于
喷气推进
内容:又不载人,为什么总盯着
氦气
?
外围参观PFEIFFER公司HLT260型氦质谱检漏仪
虎哥
5年5个月前
发表于
核技术与核仪器
内容:在真空舱的外面喷洒一点
氦气
,如果有漏孔的话,
氦气
会被抽进真空舱,然后进入质谱仪,质谱仪可以做到极高的灵敏度,因此只需要很少的
氦气
。
新闻:美国批准氦气球游太空 需花费7.5万美元
王者归来abs
11年2个月前
回复于
航空技术
内容:幻痛的心 发表于 2013-11-12 18:35 一方面是
氦气
的成本问题,另一方面是安全问题,客户想要体验太空游的费用正在下降,但作为普通人的我们,还 ...一看到太空天梯我就想到恩底弥翁。。。。
外围参观PFEIFFER公司HLT260型氦质谱检漏仪
虎哥
5年3个月前
回复于
核技术与核仪器
内容:对于正压捡漏,就得反过来测,罐子里面装
氦气
,检漏仪从另一个口吸气。
拆解 氦质谱检漏仪
RodTech
4年10个月前
回复于
核技术与核仪器
内容:是的,这个设计是被测系统自带泵,然后抽好了再开机,靠
氦气
在这里面分子泵的逆向扩散到质谱室检测,所以灵敏度低,大约跟带电子倍增器的残余气体分析仪(RGA)差不多。
回 8楼(lucifer) 的帖子
hefanghua
13年5个月前
回复于
极客DIY
内容:真空飞艇的思路不错,估计气球得用硬质材料,地面用
氦气
,上高空后抽真空。
今天玩了一种新型玩具——飞艇
longgexu
11年5个月前
回复于
航空技术
内容:引用第30楼ca-139于2013-08-10 22:26发表的 : 明明就是氮[s:178] 照片是气体公司拍的,先拍到了氮气,
氦气
应该单独放的没拍到,气体公司不能随便拍照的,一瓶气好像有六立方的气
大型飞艇可用于未来低成本高可靠发射火箭
极度深寒
13年0个月前
回复于
喷气推进
内容:毕竟
氦气
和气球成本也不低
遥控气球
1996615xp
11年2个月前
回复于
极客DIY
内容:kc2038 发表于 2013-11-9 00:25 屌丝玩不起啊,几百块的一罐
氦气
只够充两次,充一次顶不住三四天……不知换成氢气如何,氢气成本低。
制作一台可控核聚变装置(fusor)
justinpiggy
4年2个月前
回复于
核技术与核仪器
内容:KF法兰使用合格Viton O-ring对于大气渗透率已经非常低,唯一就是对氢气
氦气
渗透率稍高。,问题是大气中氢气和
氦气
含量非常少,所以除非持续对着法兰喷
氦气
,否则不会影响真空(不过氦检漏仪是可以看到的,具体表现就是停止喷
氦气
以后漏率指示缓缓上升,可能可以持续好几分钟)。
关于雷电能量收集储存的一点想法
wangjiarui
10年4个月前
回复于
极客DIY
内容:盛世大唐 发表于 2014-8-16 23:26 雷电能不太实际吧,一年才打多少次雷,况且还保证雷都打在一个地方这个世界上还有
氦气
球
225N 气氧-乙醇 电泵式再生冷却液体火箭发动机
tor44
1个月6天前
回复于
喷气推进
科创基金
内容:你猜猜为什么制式的挤压式发动机要用高压
氦气
,或者起码是高压氮气(。
真空浮球
婺源寻芳
13年7个月前
回复于
极客DIY
内容:你先用普通
氦气
球提菜,如果能行,再来谈真空气球。
星火计划 (用了一个寒假发射的探空气球)
火腿冬瓜汤
9年8个月前
回复于
航空技术
内容:是
氦气
吧~~为你的知识捉急
单晶硅片的镀膜工艺(丐版)
AtomictekOWO
2年7个月前
回复于
晶体养成所
核技术与核仪器
内容:它们大部分是上世纪末,本世纪初的产品,再加上这样的鸡屎氩弧焊,
氦气
导致泄漏也不足为奇。
氢气球航拍地球的问题
mintcrystal
7年11个月前
回复于
航空技术
内容:我以前也有这个想法,我想的是节约成本带一个旧手机和GoPro上天,气球和
氦气
某宝上都有卖,但考虑到第一个问题,我还是决定以后再说如果有好的主意或建议,欢迎补充😜😜
遥控气球
极度深寒
10年5个月前
回复于
极客DIY
内容:至于制氢气的原来倒是便宜 ...solar balloon 太阳能气球,无需
氦气
无需氢气
我做的八爪鱼飘升机~
wangrui555
14年6个月前
回复于
高电压技术
内容:还有个老外比较厉害,用几个很大的
氦气
球来抵消电池、高压发生器以及电极的重量,实现了遥控飞行。 ,我看过做得最好的是德国一家festo公司,做了一个大气离子推进遥控
氦气
飞艇(b-IONIC 飞鱼),外形非常漂亮,据他们自己介绍,大部分功率是产生等离子体用来减少空气阻力的,只有一小部分是用来提供推力的,本人由于各方面条件限制,没法搞到那么大一个
氦气
球,但是想到做不成离子推进飞艇,做一个离子推进小船也一样能说明问题,所以就把一个飘升机系统横过来装在了一个船型塑料泡沫块上。
准备做个探空气球 "Leo"
小龙
12年7个月前
回复于
航空技术
内容:也许不对
氦气
不便宜。。。。。
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