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约找到 157 条结果,耗时 0.203 秒
涉取雷电的力量
iangough
10年8个月前
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内容:第一, 用
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氦气
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氦气
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内容:高压
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认真的考虑一种电泵小型火箭的可能性
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升温.,
氦气
同样驱动RCS推力器.火箭内部的通信可以做的简单一些, 直接舰载Ethernet就行, 再学一次老马搞三个便宜x86(不用F9那种, 可以选更便宜的, F9要计算回收轨迹的), 做三重冗余.想要回收可以第一级加降落伞
准备做个探空气球 "Leo"
yang6661262
9年10个月前
回复于
航空技术
内容:没看到你谈气球啊,20里路程不是玩具气球可以胜任的,
氦气
也不好搞,。
星火计划 (用了一个寒假发射的探空气球)
水银发生器
9年2个月前
回复于
航空技术
内容:是
氦气
吧~~为你的知识捉急 我呸,XD说错了,只会用英文[s::P]
氢气球航拍地球的问题
极度深寒
9年8个月前
回复于
航空技术
内容:只做过
氦气
球的研究。。,
氦气
球最高能飞40km..
拆:HPGe(高纯锗)伽玛 能谱 探测器
北落师门
8年1个月前
回复于
核技术与核仪器
内容:不能充
氦气
什么的吗?
太空气球,回传高空图像
pengzi
10年8个月前
发表于
航空技术
内容:本帖最后由 pengzi 于 2013-11-11 12:53 编辑 想做一个太空
氦气
气球,并加载方向控制系统和图像回传系统。
今天玩了一种新型玩具——飞艇
Beacon烽火
10年8个月前
回复于
航空技术
内容:突然想用
氦气
球加遥控螺旋桨推进上下,下挂摄像机航拍。。。。。
(讨论)目前世界上比热最大的物质
okingkoom
12年11个月前
回复于
化学
内容:::XXXXXXXXXXXXXXXXXXXXXXX/question/XXXXXXXXXXXml氢气的比热容最大,14.30J/(g·K);其次是
氦气
氦,5.193J/(g·K);液氨4.609J/(g,----英文维基(XXXXXXXXXXXXXXXXXXXXXXX/wiki/Heat_capacity#Heat_capacity)上的数据(单位J·g^−1·K^−1):氢气:14.30;
氦气
:5.1932
Re:Re:回 10楼(虎哥) 的帖子
S.D.P
10年11个月前
回复于
航空技术
内容:引用第14楼虎哥于2013-08-08 22:52发表的 Re:回 10楼(虎哥) 的帖子 :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
,整个行业就得立马死绝,不过,现在科研单位怕出事故,不差钱,所以就用
氦气
了,那些博士硕士生才敢悠然的坐在下面调东西。.......
星火计划 (用了一个寒假发射的探空气球)
happy·geek
9年1个月前
回复于
航空技术
内容:还有
氦气
不可再生。
今天玩了一种新型玩具——飞艇
星条旗永不落
10年11个月前
回复于
航空技术
内容:不得不羡慕嫉妒恨啊,贵得伤人心的
氦气
居然是相充就充,想放就放,一次性使用。。。
飞机滞空的一个想法
【四方】
10年11个月前
回复于
极客DIY
内容:
氦气
。。。
回 楼主(平原上少年) 的帖子
飞湛
10年10个月前
回复于
极客DIY
内容:氢气作死,
氦气
属于稀缺+不可再生资源
出Gm制冷机全套
苦丁茶
5年1个月前
回复于
跳蚤市场
内容:现在这里
氦气
就1.9MPa了,制冷量是远远不够了
自D飞艇,瞎折腾了1个月,估计还得2个月随后跟进
林番薯
10年10个月前
回复于
极客DIY
内容:
氦气
渗透性很强,还有浮力足够吗,楼主
自D飞艇,瞎折腾了1个月,估计还得2个月随后跟进
handishen
10年9个月前
回复于
极客DIY
内容:
氦气
怎么制呀, 我知道氢气怎么制,就是太危险了
新闻:美国批准氦气球游太空 需花费7.5万美元
幻痛的心
10年8个月前
回复于
航空技术
内容: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,还是消费不起,所以才会有太空巴士,
氦气
球太空游,最新的设想是欧洲和日本提出的太空天梯计划,这种技术现在有个难以攻克的难关
单晶硅片的镀膜工艺(丐版)
RodTech
2年1个月前
回复于
晶体养成所
核技术与核仪器
内容:国产的源氩弧焊焊得非常糟糕,简直吓人,
氦气
压力逐年增加,建议做一下擦拭测试看看有没有漏。
白磷保存在真空的小塑料瓶内安全吗 会变质吗?
灬小猫
8年0个月前
回复于
化学
内容:路边找个卖气球的往瓶子里充点
氦气
是不是安全一些?
关于气球30000米以上高空摄影问题初步构思
binglayueshe
9年8个月前
回复于
航空技术
内容:计算气球充气量的网址:XXXXXXXXXXXXXXXXXXXXXXXXXXXX/Random_Aerospace/XXXXXXXXXXXml选择800g规格气球,
氦气
,负载300g,升速4m/s.预计爆破直径
关于小型商用无人机
shsyfsh
8年8个月前
回复于
极客DIY
内容:
氦气
在地球上的资源极其有限。
【继续原创】一块凝固的气体
AnthraX
15年6个月前
回复于
极客DIY
内容:忽然想起来多啦A梦长篇里的云之王国了……用
氦气
凝胶估计可以……
白磷保存在真空的小塑料瓶内安全吗 会变质吗?
园丁鸟0703
8年0个月前
回复于
化学
内容:引用 灬小猫:路边找个卖气球的往瓶子里充点
氦气
是不是安全一些?
遥控气球
立棍
12年9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
氦气
,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。
回 5楼(我说要有光) 的帖子
蛋蛋
12年1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]
遥控气球
kc2038
10年8个月前
回复于
极客DIY
内容: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……
嗯。两个小问题
acmilan
15年0个月前
回复于
化学
内容:引用第8楼acmilan于2009-07-11 17:27发表的 :你应该说是液态的...高压
氦气
效果不好。。。
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