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约找到 3478 条结果,耗时 0.353 秒
Re:回 3楼(虎哥) 的帖子
ltl
12年10个月前
回复于
喷气推进
内容:引用第4楼精密
制造
于2012-03-13 08:12发表的 回 3楼(虎哥) 的帖子 :是的,即便是忽略了时钟源的漂移,DDS合成的噪声扰动引起的频偏,要单纯实现10E-n级别的鉴频是很不容易的,况且原帖并未采用高频载波
对kc的火箭的飞控与电子系统感到奇怪
thank蓝调
11年7个月前
回复于
喷气推进
内容:他使用的控制器是Arduino nano,供电是9v电池,几个传感器进行数据采集,还有一个继电器控制开伞(貌似现在是改进版了),已经是把火箭的空间都塞满了..........所以想要进行更完善的电气化,只能
制造
更大型的火箭了
【资料】国外发动机设计图纸
xj198398xujing
14年2个月前
回复于
喷气推进
内容:其实使用45#在发动机正常工作的0.几到几秒的时间之内是完全能够胜任的实在没必要弄其他的东西来代替如果实在觉得不放心的话还有316不锈钢 这个工作10秒以内都应该没问题我门的燃料
制造
技术还不能保证能持续燃烧
回 12楼(旗舰实验室) 的帖子
乖老汉
12年11个月前
回复于
喷气推进
内容:推广你个头,玻璃钢是火箭专业化生产的一个方案,就加工难度和少量的
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成本而言怎么可能推广。
关于超级电容
skyline
11年6个月前
回复于
电磁炮
内容:PS:楼主说的好象是法拉电容,真正的超级电容不是你在taobao看的那种几V然后很1F的,那个工程师当时还提到48v100F还是1000F的超级电容的价格是3W多,这种价位的电储能设备明显肯定不是为了
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出来给民间电磁炮玩的了
新买的6N2电子管
自由无敌
15年10个月前
回复于
电子技术
内容:还有四个58年南京产的6H8P,网上说58年是新中国刚开始生产电子管,都是是仿英国
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,手工制作。
设计了3D打印的CO2激光器,各位看看可行吗
电子Q
7年5个月前
发表于
强激光
内容:初三狗一枚,略懂各种电子设计pcb
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化学合成含能材料高压电的也玩过微积分线性代数什么学的差不多造过小发动机钳工入门各种喷灯氢氧焊机太阳能发过电火箭燃料爆炸两次还活着的刚刚没中考的小伙子XXXXXXXXXXXXXXXXXXXXXX
CPLD控制经典ZVS电路设计探索
rb-sama
5年8个月前
发表于
电气电工
高电压技术
动手实践: 实验报导,严肃内容: 专著/论述
内容:脆脆对于这个问题,在她的帖子里提出了一个Solution,方法简单的说就是人为
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死区时间,让开关交叠,避免Q12同时断开。 ,所以此时才能触发下一个启动方波进入CPLD电路中,而如果给波形一个固定延迟,人为
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死区。
电子公交站牌也能“光合作用”
mass_lynnxy
15年7个月前
发表于
电子技术
内容:欧特克数字化样机解决方案(DigitalPrototyping)是一种面向
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业的产品开发方法,用户可以基于单一的产品三维数字模型,在概念设计、结构设计、工程设计、电气设计、产品设计数据管理甚至市场宣传的过程中实现高效的协同设计,欧特克
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业部高级副总裁Robert “Buzz” Kross说:“Syncromatics致力于为全国的公交机构开发创新型定制解决方案,由此带来的改善让公交乘客和经营者都受益匪浅。
能量二极管
时空隧道
14年11个月前
发表于
极客DIY
内容: 电流有电流二极管,水流有单向阀,类似二极管,能否
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出能量二极管。
日本研制出高温超导马达 输出功率达40马力
大仙
16年5个月前
发表于
极客DIY
内容:用这种马达
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的直径约80厘米、长约2米的船舶推进装置20日在横滨亮相。
比钢铁坚硬上百倍的新材料?还透明?还比银更导电?
玄明
11年10个月前
发表于
机械与工具
内容:由于石墨烯实质上是一种透明、良好的导体,也适合用来
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透明触控屏幕、光板、甚至是太阳能电池。,在2006年3月,佐治亚理工学院研究员宣布, 他们成功地
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了石墨烯平面场效应晶体管,并观测到了量子干涉效应,并基于此结果,研究出以石墨烯为基材的电路.石墨烯的问世引起了全世界的研究热潮。,石墨烯有可能会成为硅的替代品,
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超微型晶体管,用来生产未来的超级计算机,碳元素更高的电子迁移率可以使未来的计算机获得更高的速度。
云舟系列临近空间卫星发射项目
帝江航天空间动力
8个月11天前
发表于
喷气推进
内容:这款发动机目前已经设计完毕,正在
制造
中。,并且依次
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该类型的发动机,推力为2000牛,5000牛,30千牛。,完成了BM1型固体矢量火箭的研发与
制造
。
【水】【原创】简单的分析一下业余火箭发动机的技术路线
154454496
5年7个月前
发表于
喷气推进
内容:成本估算:推进剂成本普遍在10-50元每千克这一区间,并能获得300s+的比冲,但是发动机的
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是个无底大坑。,4、脉喷优点:比冲高(不需要带氧化剂,直接导致比冲可以把其他类发动机打出翔来),
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相对简单,不需要处理各种危险的氧化剂,文献资料充足。,,高燃速,可以水浴加热
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。,成本:15-20元每千克左右用途:同KNDX,但是可以搞的直径更大一点4、RNX优点:
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安全,不吸湿,可以
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大直径的发动机,固化时间长,可以很方便地做成各种形状,燃速慢(可以在无法
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大直径药柱的情况下搞大总冲,显而易见,用于火箭
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的材料应该选择比强度尽可能高的材料。
从一起步学做PCB
任某人
12年11个月前
回复于
电子技术
内容:【跟主角一批
制造
的板子靓照~【知情人士能看出来干吗用的~万恶的SMD。。】】
北美建成车首个氢气加气站
大仙
16年5个月前
发表于
电气电工
内容:这个氢气加气站目前只给6辆面包车加气,通用汽车公司
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了这些面包车展示了汽车用氢气为动力的技术。
[新发现] 尿:清洁的能源
antprince
14年11个月前
发表于
电气电工
内容:基于美国俄亥俄州立大学的专家研究出来的新技术,科学家们大概在半年后就能
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出“尿能”车和家用电器了。
钴,一只随时都可能掐死电动车产业的手
公众号EV技研作者1900
5年8个月前
发表于
电动汽车
内容:例如许晓雄博士把氧化物和硫化物电解质与PEO复合取得了很大的成功,
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出钴酸锂正极固态电池,密度达260-280wh/kg,下一步就到300wh/kg;中科院青能所采用聚碳酸丙烯酯电解质,是世界首创,正极是三元,
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商们尝试改变电池阴极的材料配方占比,将镍/钴/锰的配比从6:2:2更改为了8:1:1,以前普遍采用的NCM111、NCM523,由于镍含量较低,如今正在向镍含量更高的NCM622、NMC811以及NCA
【比赛系列】全球电动汽车比赛介绍第1期
公众号EV技研作者1900
5年5个月前
发表于
电动汽车
内容:在汽车行业,
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商竞相开发环保型汽车。, 停止比赛如果出现暴雨天气等无法保证参赛者安全的情况,将终止比赛比赛场地2018年参赛队伍及比赛成绩2、都市大エコ1チャレンジカップ(东京都市大学环保挑战杯)举办比赛的目的(官宣)1、引导中学生认识到
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的乐趣和重要性
4700万年前奇特甲虫化石:外壳颜色鲜艳未变
立棍
13年3个月前
发表于
农业
内容:根据这些形状,研究人员利用根据现代甲虫外壳
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的模型进行计算,推断这些化石最初究竟是何模样。
关于PX项目的一些观点
博丽灵梦
10年9个月前
发表于
化学
内容:然而,催化重整和热解法的BTX(苯、甲苯、二甲苯)
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工艺中,三者的产量比(苯:甲苯:二甲苯产量约为32:36:32)和业界的需求(苯:甲苯:二甲苯需求大约为55:11:34)不符。,因此,产生了使用供大于求的甲苯
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另两者的商业动力。,用途 对二甲苯主要用于
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对苯二甲酸,可用于化工及制药工业等。,此外,对二甲苯也是
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增塑剂的原料。
仙童(Fairchild)让你感慨半导体业的历史
虎哥
7年9个月前
发表于
科学技术学
内容:“仙童”们商议要
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一种双扩散 基型晶体管,以便用硅来取代传统的锗材料,这是他们在肖克利实验室尚未完成却又不受肖克利重视的项目。,仙 童半导体公司在诺依斯精心运筹下,业务迅速地发展,同时,一整套
制造
晶体管的平面处理技术也日趋成熟。,仙童公司
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晶体管的方法也与众不同,他们首先把具有半导体性质的杂质扩散到高纯度硅片上,然而在掩模上绘好晶体 管结构,用照相制版的方法缩小,将结构显影在硅片表面氧化层,再用光刻法去掉不需要的部分。,早在 1962年,仙童半导体公司就在缅因州建立了研制和
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晶体管的生产线,在加州,在犹他州,甚至在南韩和马来西亚都有其分部,在半导体器件领域仍有较强的 实力,主要研制和生产半导体存储器设备。,这次收购将使仙童
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的半导体产品更适合于电视、录像机和音频设备,大踏步地向消费电子
制造
业挺进。
招贤纳士
帝江航天空间动力
10个月1天前
发表于
会员海报
内容:完成了BM1型固体矢量火箭的研发与
制造
。
测试放电管大电流下的导通压降以及击穿电压
Ball_Lightning
2年5个月前
回复于
电磁炮
内容:如果三级开关另外半部分真的是靠储能电容自己击穿的,那它也太不可靠了——会不会由于
制造
工艺问题,冲着冲着电就走火了😆。
大家来讨论下太空战舰对轰用什么武器好。
火炎焱焔
8年11个月前
回复于
电磁炮
内容:能源核心舱拥有战舰的大部分能源调配权,可为主推进器提供能源或对战舰整体进行电磁牵引,同时吸引战舰外部的金属碎片以高速绕舰运转来防御有工质弹头,
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电磁黑洞吞噬敌方的激光武器或隐藏战舰自身反射的光线和屏蔽自身的电磁通讯防止敌方窃听情报
超音速飞行,头锥那里到底有多高的温度?
darkorochi
12年5个月前
回复于
喷气推进
内容:我们决定
制造
世界上第一架钛飞机。,我们甚至必须自己
制造
钛螺丝钉和铆钉。
CSX620 64B运算加速卡,厂家提供开发工具和开发包,我想知怎么样用这些东西请人开发
jrcsh
14年0个月前
回复于
软件综合
内容:◆ 从性能上看,GT200在单精度性能上要远高于其他加速器,由于其使用了先进的65nm集成电路
制造
工艺,导致其性能功耗比较高。
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