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回复于
电磁炮
内容:模拟寻找最佳参数,
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多级感应式加速器并达到100m/s初速(如果前期重接炮就发挥得很好那么我会拆掉几级感应式,找到那个脉冲感应-重接的平衡点)7.
尼摩艇长的礼物——钠电池的制作
火星居士
10年9个月前
发表于
极客DIY
内容:而我从海水中提出来的就是钠,我就是用这些钠
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我所需要的物质。” ,具体反应原理如下: 总反应:2Na+2CH3CH2OH=2CH3CH2Na+H2 负极:Na-e-=Na+ 正极:2H+ +2e-=H2 确定结构和电极,电解质材料之后,电池就可以开工
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了。
Cvnx的火箭试制历程(阶段二〉人生最爽的事情莫过于看着自己的火箭一飞冲天……
cvnx
15年0个月前
回复于
喷气推进
内容:,以及文具店、药店、五金店、化工店里常见的物品(在本地,这些商店里的东西在种类、数量和质量上都很匮乏,离如我买了N多胶水都是一家到燃料里就变成硬胶块,而PVC给水管则根本没有卖,尽管我也很想用),没有
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2018全球电车市场数据回顾
公众号EV技研作者1900
5年7个月前
发表于
电动汽车
内容:销量视角特斯来为最大赢家,交付超过145000次北汽EC系列攀升至第二位,达到90000次交付日产Leaf下降为第三名(87000)
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视角特斯拉小胜中国比亚迪(245000VS233000),但如果加上公共交通工具
不用子弹的空气枪
laodayu
8年9个月前
回复于
极客DIY
内容:为了减少雪崩对滑雪者的安全,就用了一个大约洗衣机大小(具体多大不要计较)的机器,有炮管,那个东西解说叫“空气炮”,那个东西解说叫“空气炮”,那个东西解说叫“空气炮”,用空气炮对有可能即将发生雪崩的雪山发射空气炮,人为
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雪崩
解析粘土3D打印现状
魂溷
8年9个月前
发表于
机械与工具
内容:在2014年意大利设计师和工程师Francesco Pacelli,利用注射泵也
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出了打印粘土的3D打印机 利用丝杠螺母的注射泵 粘土3D打印机 2015年2月3D PotterBot也推出了粘土,而且不是采用注射器而是自己设计
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的料筒活塞,喷嘴还有各种不同直径的。
知识贴:大型模拟复印机的原理
虎哥
14年10个月前
回复于
电子技术
内容:该机为丹麦
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,工作时几乎没有噪音,与国产空压机的可以把人吓跑的巨大声响形成鲜明对比。
[连载]从零打造电动汽车第1期——电机的选择
公众号EV技研作者1900
5年5个月前
发表于
电动汽车
内容:
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耗电量少、经济适用的电动车,重点在于运用更高效率的电机和逆变器,以及轻量化车体和减小空气阻力。
电动汽车背后藏着——石油、战争、地缘政治
公众号EV技研作者1900
5年8个月前
发表于
电动汽车
内容:但随着技术的进步,
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工艺的更新,市场规模的扩大,最后总以惊人的速度走入寻常百姓家。
强酸分解芯片
北落师门
14年8个月前
发表于
化学
内容:试管中其实没多少水,400℃下早就蒸发了,主要是没有蒸发的硫酸,此时开始析出晶体,不过这仪器貌似有点接触不良,一次消化不能完全将硫酸蒸干,需要再次消化,否则到测定的时候定量加入的碱不能中和剩余的酸,无法
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出强碱环境
Re:回 3楼(北落师门) 的帖子
skyline
11年9个月前
回复于
电磁炮
内容:尾翼稳定的缺点是弹体的结构复杂
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成本高不适合像自旋弹那样低成本批量
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,人类历史上口径最大装药最多的自旋稳定火箭弹的射程都没有超过30公里的,而采用尾翼稳定的火箭弹射程超过200公里甚至达到300公里的现在各个国家一抓一大把
民营企业发展趋势
1211
19年2个月前
发表于
极客DIY
内容:该公司从事激光加工设备的
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业务,从一开始就瞄准国际同行业的先进水平,在美国硅谷设立了研发中心,并以当地的薪金水平招聘中国留美人才。,民营高科技企业的崛起——以深圳大族激光为例 深圳大族激光是从事激光加工设备
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的企业。,1996年,大族激光成立,在国内率先采用产业化模式
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销售激光加工设备产品,逐渐开拓了我国自己的激光产业。,现在,激光打标机、激光焊接机、激光钻孔机、激光切割机等已成为当前工业
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业重要的支持装备,极大地改善了产品
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精度、质量和效率。
讨论生命科学的技术管制问题,以及连带的潜在的严重矛盾
1379号监听员
3年10个月前
回复于
科学技术学
内容:南非变种已经开始突变那个突触来谋求免疫逃逸了;论据2,“人体内执行代码”设想一下你自己的电脑,你就知道潜在风险多大了,就知道只靠表面上不出问题就过关的黑箱实验来审批多不靠谱了,事实上这类权限申请必须明箱开源,让各个国家各个群体自己为自己
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[转载]DIY全金属框架的3D打印机
skylighter
11年10个月前
发表于
机械与工具
内容:● 这个模型的直径约3英寸,在DTM 2500Plus快速成型机上采用激光烧结技术
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。,图中是截角120胞体的正交投影模型,用光固化成型技术
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,直径约6英寸。,这个模型是在用现代
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技术,向制作同心象牙球的传统艺术致敬。,这里是
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半个孟结海绵的stl文件,这个用激光烧结技术制作的模型边长是5.5厘米。,同时它也具有向杰出的数学家、天文学家、器械
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专家:Abraham Sharp致敬的意义。
电气武器版发展指南
1211
15年9个月前
发表于
电磁炮
内容:对于设计
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电磁枪弹速度计、激光功率计、声强及声频谱分析设备等类设备及其分析软件的帖子,给予大幅度加分奖励。
鸿鹄I型火箭、C2max发动机试车报告
CIT
1年9个月前
发表于
喷气推进
动手实践: 实验报导,严肃内容: 专著/论述
内容: 鸿鹄I型火箭:百米级可回收探空火箭 我的当前目标是
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探空火箭,经过先前的一些沉淀学习,我在新年伊始正式确定了,我要造一个什么样的火箭,鸿鹄I型火箭,70厘米高,直径6cm,重量约为2kg
【DSA神作】XT-2项目证明文件,参考模仿用,再也不用担心写不出项目报告啦!
chemistry02
7年9个月前
发表于
喷气推进
内容:目录:证明文件I “‘星天二号’半探空火箭研究与
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项目”规划安排书 四改版证明文件II 软件仿真数据及结果证明文件III 项目所用结构与气动等材料的理化性质、力学性质等简单分析证明文件IV
暑期火箭制作活动寻求指导
蜂起4223
7个月6天前
发表于
喷气推进
内容:科研现状:目前已经设计
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了一枚57mm火箭。
开源火箭设计软件OpenRocket汉化计划
warmonkey
11年5个月前
发表于
喷气推进
内容:并探讨了如何对此软件进行汉化11年11月:warmonkey使用OpenRocket设计了万户2号火箭12年9月:拔刀斋版主使用OpenRocket设计了万户3号火箭的气动外形,并被焓熵版主应用到实际
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中光有中文版压缩包是不够的
有奖金。求各位大侠推荐一种材料
龙之舞
10年11个月前
回复于
极客DIY
内容:"凯夫拉"与碳化硼等陶瓷的复合材料是
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直升飞机驾驶舱和驾驶座的理想材料。,凯夫拉"材料还是
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避弹衣的理想材料。
LCR大比拼
mass_lynnxy
15年9个月前
发表于
仪器仪表
内容:Chroma,中茂或致茂电子,虽不是通用仪器
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商,但在生产测试方面却广有涉猎,并均有建树。,Wayne kerr 6440B Wayne kerr是全球有名的元器件测试仪器
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商,LCR尤其出名。
200年内人类有可能进化出利用三聚氰胺的能力吗?
latexles
14年6个月前
回复于
科学技术学
内容:所以有望在目前CPU技术的基础上
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出连接脊髓神经的芯片。
为什么要废除中医中药 ZT
warmonkey
14年2个月前
回复于
科学技术学
内容:甚至大肆宣传能治疗现代医学现在还不能有效医疗的疑难病症(如癌症、艾滋病、血糖病、股骨头坏死等),
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针刺麻醉、针刺治疗聋哑等虚假现象”号脉能获得许多特别的信息,西医也会号脉,用听诊器和血压计配合测量血压的时候
回 24楼(qq363606096) 的帖子
whd1982
11年7个月前
回复于
电磁炮
内容:你理解错了,效率上讲,钉子完胜钢珠,我的意思是,由于用钢珠加速实用性上是大大超过钉子的,所以我宁愿损失那点效率换取实用性从自制的角度讲,电炮的最大优势是无需复杂的机械结构与
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工艺就能获得超越常规汽狗的动能首先要明确自己的目的
夺命智商税:核辐射超常500倍的负离子粉保健品
虎哥
4年11个月前
回复于
核技术与核仪器
内容:这些东西当然最先祸害日本国民,后来主要电器
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商发现忽悠外国人更有商业利益,产品就行销世界了。
901调试双工器时动态被压缩的原因和推荐解决方案
虎哥
11年9个月前
发表于
无线电
内容:如图,这支进口双工器调出了120dB的隔离度(仪器输出端有10dB衰减器改善匹配,输入端接有一环形器,仪器批号是213,去年9月
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) 注意:上图只是为了演示效果,实际工程中千万别把双工器调这么尖,这曲线手轻轻敲一下双工
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