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第一版 第一章(燃料部分,其中增塑剂为聚乙烯醇,普通箭体
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请参见基础手册,该书其他章节正在整理中) 下载地址: 本板块 帖子索引链接地址:https,://XXXXXXXXXXXXXXXX/t/33147常用模拟仿真及计算软件数据与公式:固体火箭发动机特性的计算[部分2分] XXXXXXXXXXXXXXXXXXXXXXXX/t/6739想用KNDX
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火箭发动机的请进
一种家用型大功率微风风力发电机系统
风电氢能
9年1个月前
回复于
极客DIY
内容:投入成本要根据实际
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的大小决定,还要根据环境决定,在海边效率肯定高于内陆。,折算小批量,还没计算过,主要还没确定究竟往哪个方面发展,是生产氢气的制气厂,还是生产风力发电机的风机
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厂。
任意插座
jrcsh
15年9个月前
回复于
极客DIY
内容:引用第12楼hamdad于2009-05-11 22:43发表的 :楼主过分高估了天朝
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两脚扁平电源插头这样简单电气零件的水平,姑且不找出相关国家标准规定的机械公差数值来论证,随便找您家的两只两脚扁平电源插头,虽然不安全 可考 但如果 楼主还是高中生以下 还是有不错的 创新能力前镜 我们 因当 帮他 找/指出不足之处 好了 好话说完了 来说说这个 天天用 惯了 垃圾播头和家伙吧 楼主过分高估了天朝
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两脚扁平电源插头这样简单电气零件的水平
和同学进行knsb燃料试点燃与确定火箭发动机
九又
4个月3天前
电波长电文
内容:燃料前端表面点火.....发动机尸体以下是发发动机的选取:总共
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价格560rmb(找人定制)话说此发动机是不是有些贵....
08年我国将诞生首个超高速电磁炮!!
大仙
16年5个月前
发表于
电磁炮
内容:在交通领域,用电磁发射原理
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电磁列车,使用原铁路轨道,其成本仅是磁悬浮车的1/4。,在工业方面,可用其原理
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电磁抽油机,代替目前油田的机械抽油机,从而大幅提高抽油效率及降低成本。,在海军方面,还可以
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磁流体喷水推进舰船。
欣赏一下一部无线电监测用测量接收机
1211
17年6个月前
回复于
电子技术
内容:我国
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的不少高频仪器也采用类似的有夹层的屏蔽结构,通常夹层是橡胶,接地点只能在板子的四周。
回 10楼(2012) 的帖子
gongluzhu
12年0个月前
回复于
化学
内容:但我认为,国内多数喜欢吃橄榄油的人肯定是想喜欢茶籽油一样,有一种情结在里面 ,当然
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千岛酱等用这个还是有一定优势的。
关于AI,关于人工智能
bunny9915
13年10个月前
回复于
极客DIY
内容:还有什么算是智能呢 一定要到 表达情绪才算智能么如果我们做出了一个程序能够完全和狗一样的行为和能力应该也是一种智能吧我想的基于大脑的构造的问题,是首先模拟一个智能产生的基础环境我们
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了很多计算机来实现
随身自行车道的改进?
herryuan
15年5个月前
回复于
极客DIY
内容:这个摆动不一定要靠电机什么的来
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恒定频率的固定摆动,完全可以靠弹簧或者簧片之类的结合骑车时的震动来获得,这样的闪烁频率不固定,更容易引起注意。
会自动发光的安全头盔
bunny9915
10年9个月前
回复于
极客DIY
内容:狂犬疫苗的例子虎哥早就说过,中国不能永远这样,为了偷懒就把整个成本转嫁到社会,这根本不是在解决问题,而是在
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新的问题
[原创]彻底抛弃汽油:电动车辆的未来战略
lifefire
17年7个月前
发表于
极客DIY
内容:电动汽车的构想出现以后,其环保优势和节约战略石油资源的潜力让所有的政治家和科学家为之振奋,尤其是轮毂电机问世以后,使电动汽车的设计更加简化,可靠性进一步提高,
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成本急剧降低。
回 12楼(rudolf) 的帖子
天易
11年7个月前
回复于
跳蚤市场
内容:而微米镜体积相对超小,塑料机架够用了,为什么还要舍弃低成本的
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呢?
[转帖]3D打印技术为DeltaWing赛车提供高质量零部件
wall哥
11年10个月前
发表于
机械与工具
内容:GRP通过使用3D打印技术为DeltaWing提供许多重要组成部分,包括电子外壳、电气接口、变速箱集成压力供油通道以及其他特殊构建部分,3D打印技术和Windform XT 2.0材料大大缩短了汽车的
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时间
新作完工!重型HID手提探照灯 烈阳使者
power_rdx
14年6个月前
发表于
机械与工具
动手实践: 实验报导
内容:该作品应用诸多创新设计,使用77口径的MCUV作为灯头玻璃,显著提高亮度输出,并可极为方便的安装各类摄影滤镜以获得不同的照明效果;使用铝合金型材及板材
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外壳,成功摆脱了成品手提灯外壳对制作的限制;使用多个
航天局的日常/玉兔5火箭讨论
novakon
11年2个月前
发表于
喷气推进
内容:在这里,我希望明确一下YT5火箭的主要技术目标和尚存在的障碍,如果现存的问题能够给出合理的解决方案,航天局会立刻启动YT5的
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计划。,YT4火箭的设计、
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与升空,证明了以下几点: 1)航天局有能力
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用于达到5km发射高度的固体发动机及其燃料。,3)航天局有能力
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适合该级别火箭的惯性姿态开伞装置(彩虹之巅),并经过了实践的检验。
美国测试更安全、更简单的火箭燃料:铝冰
Missile
13年10个月前
发表于
喷气推进
内容:也许ALICE推进剂最吸引人的地方就在于它可以“现场”
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,十分简单,也就是说几乎可以在任何地方进行生产。,对NASA来说,“现场
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”就意味着有可能在月球上、火星上或者其它地方进行ALICE推进剂的生产。,使用铝和水
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推进剂的想法并不是最新提出的。 ,柏坎说:“先前是在铝粒子的规格上
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铝水推进剂的。
[霉帝文献]固体火箭发动机的喷管
hamdad
16年5个月前
回复于
喷气推进
内容:原文是1976年发表在美国公开出版的学术期刊上的,在此转载的目的并非试图引导业余火箭爱好者能够
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出100%达到制式武器火箭性能的发动机。
为什么都是硝酸钾搭配葡萄糖而不是白糖?
mudi815
17年9个月前
回复于
喷气推进
内容:混合温度在150-160摄士度.铸造为空心管状药柱.孔径至少4毫米(太小没有实际意义).外面可以的话用牛皮纸包裹.注意:禁止在加工过程中接触水分,连湿度太高>60%都不行,因为此推进剂有一定的吸湿性.所以
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后尽快装到发动机里密封好
安全无保障
1211
10年10个月前
回复于
喷气推进
内容:建议楼主多发些比较擅长的机械
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方面的技术贴,在这方面与网友多交流。
详解模型火箭箭体,发射架制造及一次成功的火箭发射
极度深寒
12年6个月前
回复于
喷气推进
内容:剩下的在我以前帖子的资料里第一种我建议使用PVC管卡配合管子
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。
回 14楼(小特斯拉圈圈) 的帖子
20!Dopaminor
11年6个月前
回复于
高电压技术
内容:血气方刚么 就开始喷(kc这么多人 总有一两个会去喷的....)然后那些民科小白就会用他们的先进理论反喷,结果你是知道的虎哥不也在说这个问题么,下次安排几个人见到这种小白问题就先做个有爱的回答,做个榜样和
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一个良好的环境
LH4-B 设计图全公布 (一种不错的非金属固体发动机设计)
FROZEN巨擘
9年7个月前
回复于
喷气推进
内容:直接用石墨做称喉就好过于复杂的结构增加了重量和
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难度 而且PPR耐压高于PVC管即使是2层套管 我一直用PPR和石墨喷管 还可以重复使用2~3次 复杂的结构确实增加了重量,不过都是用五金店买的成品零件
玉兔(YT-5)火箭成功发射
花心大萝卜
9年5个月前
回复于
喷气推进
内容:先从
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整流罩开始吧,ZM-1型打印机,你值得拥有。
比亚迪搅局电动汽车
LED
17年1个月前
发表于
极客DIY
内容:比亚迪搅局电动汽车来源:理财周报 “比亚迪2015年建成中国第一汽车
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企业,2025年成为世界汽车龙头老大。”,“铁电池”这种全新电池是用价格低廉的铁元素
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电池的阴、阳两极,因此其成本要比采用锂、钴等贵金属
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的锂电池成本要低得多,而其电容量又很接近锂电池水平。
关于“中华民族是个劣等的民族”的争论
立棍
13年3个月前
回复于
科学技术学
内容:故意
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道德沦丧,是否为了故意的扼杀良性逻辑?)
爱好变职业有多难?
novakon
8年0个月前
回复于
科学技术学
内容:将来很可能
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智能机器人的只是少数人,大多数人的工作则是想办法把自己熟悉的技能传授给机器人,并藉此产生收入,而这会显著降低爱好变职业的门槛(因为生产力加倍了,生产力的质量就显得不那么重要了),这也是提及人工智能的原因
镓铟锡合金的制备
火星居士
11年0个月前
发表于
化学
内容:但是,由于
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成本的高昂,镓铟(锡)合金目前的应用还不广泛,而国外也只是少部分同仁
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并研究了这种合金。,至于国内,目前能够有能力大量
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并进行了系统研究的同仁更是少数。,二、具体制备过程与冶炼法 目前应用最为广泛的镓铟锡合金是一种名为galinstan的专利合金,它在低温环境下依然能够保持液态,再加上成本较镓铟合金低,因此也是
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最多的镓铟锡合金。
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