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极客DIY
内容:引用第4楼wzx0033于2010-10-17 22:02发表的 :其实人工心脏难点不在于
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泵,难的是怎么样提高其工作可靠度,因为这个泵一旦停止几分钟内不能恢复人就死了,而没有必要设备与人员几分钟内根本解决不了设备故障其次是延长其更换周期
高等学校教材【固体推进剂性能】
bkh123
12年9个月前
回复于
喷气推进
内容:2 温度对反应速度的影响第六章 固体推进剂的燃烧性能 §6-1 燃烧的基本概念§6-2 固体推进剂的燃烧性能参数§6-3 固体推进剂稳态燃烧机理§6-4 固体推进剂燃烧线速度测定第七章 固体推进剂装药
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工艺,§7-1 双基及改性双基推进剂的
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工艺§7-2 复合推进剂的
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工艺§7-3 固体推进剂的包覆材料及包覆工艺§7-4 固体推进剂装药的质量检验第八章 现用固体推进剂性能评述 §8-1 双基推进剂§8
关于惯性技术的介绍
samhrc
12年10个月前
回复于
航空技术
内容:拆过一个,里头距离检测磁头是铁氧体烧结
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的,跟转子间隙不到一毫米。
【59元套件】 ‘Fulcrum’复用型铝合金固体火箭发动机套件预售中
飞鹰航天
1年11个月前
发表于
会员海报
喷气推进
内容:请认准该标志发动机壳体采用黑色磨砂工艺外壳可重复使用套件采用树脂复合材料喷管内衬及陶瓷喷喉复合材料喷管采用双圆弧型面设计双圆弧法构造喷管是基于径向流动条件提出的,众多前辈的实验经验证明这种喷管的型面不会产生激波,而且此方法构造的喷管较短,适合于微型固体发动机本设计为提高
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喷管的工艺连续性和成功率
“反一次性筷子”的闹剧该收场了 zt
latexles
14年11个月前
发表于
科学技术学
内容:事实上,根本不会有哪个厂家会奢侈到用一棵棵价值不菲的森林原木来
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区区“6000—8000双”价格低廉的一次性筷子。,那些质地坚实、油脂丰富的优良木材也根本不适合
制造
一次性筷子。,有人要问了,那
制造
这些一次性筷子所耗用的木材总不会是人为“变”出来的吧?,一次性筷子的主要原料正是来自于人工种植的速生杨、桦树等质地疏松、油脂较少的经济林木和其它边角废木料,还有部分则用竹子
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。
沙漠中为什么不利用太阳能要制造冷凝水呢?
hambaby
14年4个月前
回复于
极客DIY
内容:沙漠中的相对湿度经常只有不到5%,露点低于气温50摄氏度,恐怕只能
制造
肉眼都看不见的一点“霜”出来。
【MS精工】超级电车“风暴之灵”诞生记
power_rdx
11年8个月前
回复于
电动汽车
内容:他们
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出外形奇异的整流罩,甚至为此举办专门的比赛。
1959年德国德克尔DECKEL高精度万能磨刀机
tongbaoa
13年0个月前
发表于
机械与工具
内容:我手感下来横向框量应该10丝以内,一般0.1-0.2毫米框动量作为钳工会感觉出来挺明显的,他们
制造
的几丝框量就可以达到自清洁导轨,磨刀机会产生大量的磨粒到燕尾槽上,紧密的燕尾配合可以自动赶走可恶的磨粒,,现在的导轨配合正好达到了这个效果,打开燕尾可以看到没有磨粒引起插伤丝痕,工艺还挺考究的,不是一般等级灰口铸铁
制造
的,怎么也是好点的孕育铸铁。
飞机发动机的新思路
标准手业
11年2个月前
发表于
极客DIY
内容:这样的话,飞机的外形可以有更多的选择,甚至可以用来
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飞行汽车什么的。
电容使用知识
mass_lynnxy
16年5个月前
发表于
电子技术
内容:但若依功能及
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材料、
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方法细分,那可不是一朝一夕能说得明白。,美国货也仅能排第二,瑞典或德国
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的才能排第一。,
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日期,9627就是1996年第27周出厂;近年来日制电容似乎逐渐有意省略
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日期的标示。,
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厂牌也关乎品质特性,前述有人终其一生不用日制品。,但只要是仍在美国
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,外皮印有made in USA,商标更改与
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品质应无关联。
关于模型火箭、火箭模型、竟技火箭、业余火箭等用语的规定
leeqingyang
12年0个月前
回复于
喷气推进
内容:科创火箭版是探讨火箭技术和业余火箭设计
制造
的专业版块。,所谓业余火箭,参照国际通行的定义,是指主要利用非政府、非商业资金或条件设计和
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的火箭,其设计、
制造
、发射等活动服务于科技爱好者及其组织,而非政府、军事或商业用途。,业余火箭活动、业余火箭制作等,属于科技爱好,是科技爱好者围绕火箭研究及其应用而展开的研究、开发、
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、测试等一系列活动的总称。
美科学家发现月球北极含有6亿吨水冰(图)
玄明
14年11个月前
回复于
极客DIY
内容:火星适合人类,我记得有个设想是
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一些大镜子,把阳光照在火星一点,氧化物释放氧气。
沙漠中为什么不利用太阳能要制造冷凝水呢?
hackboymzw
14年4个月前
回复于
极客DIY
内容:沙漠中的相对湿度经常只有不到5%,露点低于气温50摄氏度,恐怕只能
制造
肉眼都看不见的一点“霜”出来。
关于小型商用无人机
3.14
9年6个月前
回复于
极客DIY
内容:飞艇用什么气体,飞行高度以及航线(不能影响到其他商业飞机的运行),航行速度等,飞艇的结构设计、大小、载重量、设计使用寿命等以及所用的材料,造价,
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工艺、流程,建造所需要的设备和检测、维修设备,安全系数等
[历史帖,已废止]关于探空火箭的制作
jlt1
16年11个月前
发表于
喷气推进
内容:为作好首发火箭,发动大家一起参与设计与
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工作。
冬天到了,保暖衣物依然是世界性难题,怎办
shsyfsh
8年11个月前
回复于
极客DIY
内容:苦逼的
制造
业 棉花应该是最不保暖的材料之一了,一般用克罗值来衡量材料的保暖性能 常见的各类材料克罗值数据如下: .04 clo/oz (棉) .084 clo/oz (美利奴羊毛)?
陀螺仪简介
kltty
16年3个月前
发表于
电子技术
内容:利用这种光程的变化,如果使不同方向上前进的光之间产生干涉来 测量环路的转动速度,这样就可以
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出干涉式光纤陀螺仪,如果利用这种环路光程的变化来实现在环路中不断循环的光之间的干涉,也就是通过调整光纤环路的光,的谐振频率进而测量环路的转动速度,就可以
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出谐振式的光陀螺仪。
市面上常见的电动机能达到1500r/min的速度吗?
hamdad
16年10个月前
回复于
跳蚤市场
内容:直流空载转速能有18000,而玩具赛车马达的空载转速可以达到数万甚至十多万请您列举出商品玩具马达(电动机或者发动机)转速≮100,000rpm的型号及生产厂商,让吾等菜鸟也开开眼……197x年,意大利
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的
3D打印机商业战场硝烟四起有望造就新的亿万富翁
神の左手
11年10个月前
发表于
机械与工具
内容:这一变化不是因为这一年来3D技术取得的研究成果,而是基于全球
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业整体出现低迷态势,许多人将
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业复兴的希望寄托于3D打印行业。
[转帖]3D打印带来生产技术革命-光明而崎岖的颠覆世界之路
skylighter
11年10个月前
发表于
机械与工具
内容:长尾理论下的3D打印 美国《连线》前主编克里斯 ·安德森提出长尾理论并决定进入3D打印机行业无疑是为这个平静了几十年的增材
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技术注入了新的活力,有关3D打印机技术的相关信息爆炸式的进入人们的耳朵。,3D打印带来的革命性影响 有分析人士指出,3D打印将改变传统的
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方式,带来工业变革,对人类社会有着深远的影响。
普源DS1052E示波器本底噪声有4mvp-p,正常吗?
1211
15年11个月前
回复于
电子技术
内容:所以,这种毛刺是示波器的设计缺陷和
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工艺缺陷所造成的,并非数字示波器的固有现象。,我也十分希望贵厂能够成长出像泰克一样有影响的仪器
制造
商。
【重磅】【猫猫】DIY大功率可调电源,焊台,热风枪三合一便携设备
落叶兄
4年8个月前
发表于
极客DIY
会员海报
内容:设计与
制造
过程我之前在实验室里负责过一些电源的设计,我先是设计完电路图便赶紧画出pcb给交给工厂打样去了,为了尽可能缩小体积,除了没有贴片的元件以外,全部采用贴片元件。
发动机测试(090103)
glock
16年1个月前
回复于
喷气推进
内容:我一直都在想办法
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微型的点火头,桥丝一直都用25W电烙铁里的电热丝,因为用焊锡焊不起来,所以就弯折导线夹住,所以体积还还是稍微有点大。
[讨论]电泵液体火箭发动机的发展前景及业余爱好者试制的可能性
虎哥
3年0个月前
回复于
喷气推进
内容:XXXXXXXXXXXXXXXXXXXXXXXX/t/83408对小液机来说,能不能用电来驱动是次要矛盾,涡轮泵太小以至于性能很难做起来是主要矛盾,关键是涡轮泵的设计和
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工艺,驱动电机和电源的方案已经有比较好的工业基础了
【多图】有关余空航天(原技术宅科技)真空仓内爆事故的陈述与报告
红盟大使
8年10个月前
回复于
喷气推进
内容:真空仓的操作或是
制造
本身就是一件危险的事,坑了这么多钱,还不给消费者一个最基本的安全保护,简直不知道他们怎么想的,难道钱真的比生命要可贵?
固体火箭结构诸元的计算方法
虎哥
16年4个月前
发表于
喷气推进
内容:本系列主题关系着火箭设计
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的成败,因此非常重要。
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