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约找到 5783 条结果,耗时 0.401 秒
大型火箭,分离装置设计
焓熵`
13年8个月前
发表于
喷气推进
内容:爆炸螺栓虽然工作稳定,但是不能保证传感器第一时间把辅助发动机分离,因而出现了动力损耗(就是“主体发动机拖着辅助发动机飞”)希望大家指点指点···~~~[s:233]
《导弹总体结构设计网络课程》
虎哥
16年5个月前
回复于
喷气推进
内容:4-2-3 气动布局的横滚稳定性分析 导弹以攻角、侧滑角()飞行时,因气流不对称产生的相对于纵轴的滚动力矩称为斜吹力矩。,有时会因为气动布局不当而使斜吹力矩达到很大数值,其方向可能是正号也可能是负号,力矩的数值可能超过偏转横滚控制面所能提供的滚动控制力矩,因此,在选择气动布局时就应采取措施减小斜吹力矩,使导弹获得较好的横滚稳定性,所以从横滚稳定性来说,在所有气动布局中,鸭式是最不利的。,由于横滚稳定性不佳,滚动力矩较大,而鸭式的舵面面积较小,因此,鸭式导弹不能用舵面差动来起副翼作用。
一个困扰我多年的问题PH试纸能否测双氧水
ne555
9年7个月前
回复于
化学
内容:我觉得在动力学上有不少关系,甲基紫也是一种比较稳定的酸碱指示剂,上一次在氢氧化铁存在下,用过氧化氢氧化很稀的甲基紫溶液,用了半天时间,肉眼才能够看出变化,用了一天一夜才比较彻底。
我的DR啊,弄死都不出电弧,调压器都调到200V了~!
七千八百二十一
8年10个月前
回复于
高电压技术
内容:做个小机器,线圈制作的成本很小~更何况,我一不是卖模块的,,二不是卖全桥的 ,我只是希望刚入门tc的爱好者直接做一个安全,不容易过载,稳定,不用总去更换零件的dr罢了,
对1g硫酸镭(RaSO4)【含硫化锌、非纯】的简单测评
NuclearExplorer
2年6个月前
电波长电文
内容:可以在镭盐中加入铍粉从而形成镭铍中子源*)反应类型:衰变反应活度:未知(本人家境贫寒,买不起活度剂)最高实时西弗:10.03μsv/h(隔瓶测,没有特殊的防护措施不敢打开,里面有氡气)附:镭-226为镭的最稳定同位素
620v IGBT半桥式 MCU开环控制 紧密加速线圈炮测试更新:七级已破百
iSee
7年0个月前
回复于
电磁炮
内容:引用 3DA502:引用 iSee:引用 3DA502:烧一堆管的钱足够PCB打样几次了这是沉金工艺的四层阻抗板,内部都是大片的电源和地平面,本身是用于16路1.458G差分信号处理,电源和地的稳定性非常好
什么样的微处理器才能满足电机矢量控制?
公众号EV技研作者1900
5年5个月前
发表于
电动汽车
内容:进行180°通电时,A-D 转换时间在PWM 通断动作时无法准确地捕捉,需要在电流稳定时进行观察。
利用光电反馈实现磁悬浮
novakon
8年9个月前
回复于
电气电工
内容:这预示着:如果我们把螺丝钉靠近电磁铁,令距离小于d2,那么这颗螺丝钉最终会稳定在d1的位置上,而不会紧贴在磁铁上,也就实现了悬浮。
回 2楼(cnxunuo) 的帖子
willychen
11年9个月前
回复于
极客DIY
内容:波长,光斑质量,稳定性一个都不能少[s:226]原因是用途:全息试验1,拍明胶全息,明胶只对蓝紫光敏感,红光,绿光,根本不起光化作用,通讯用的红外LD更不用说了,所以得买405NM的2,功率?
KC-LS1u简介和预订
神之觉醒
9年11个月前
发表于
会员海报
内容:这次开发过程不是很顺利,套间测试过程中经过1次BUG修正,完美修正了CPU内核的两个BUG,目前运行稳定.,本机搭载了一颗独家原创设计的精简单周期处理器,能提供高达1MIPS/MHZ的处理能力,这个内核用74HC系列IC的情况下能运行达到12MHZ及以上的频率,为用户提供了强大而稳定的处理能力, 下面为两片CPU
为什么不能放纵濒危生物就此灭绝?
usafn6132
9年2个月前
回复于
农业
内容:如果想有人类没想到的更多可能性,也不应该把濒危动物关到人工场所里保护啊,那样一个稳定、食物充足又没有威胁的人工生态环境很难或者说根本不会让生物进化啊,因为没有任何自然选择的空间啊,这种封闭式养殖的状况跟把濒危物种全身插满管子泡在仪器中的营养液里养殖有区别吗
教你如何把Arduino项目做成成品,Arduino管脚对应关系
justinpiggy
11年7个月前
发表于
电子技术
内容:电路供电5V一下也是可以的,理论上如果工作在16MHz,不能降得太低,但是我最新一次测试显示降到3V仍然可以工作,不过不一定
稳定。
指令集不全的炮灰级8位CPU
vol2088
11年5个月前
发表于
电子技术
内容:LZ马上要上大学,985大学的条件比较好,我的专业也是对口的电子信息工程,入学后稳定下来就会把成品做出来,贴片芯片+PCB。
航天小硕的就业抉择
忆昔长别
4年6个月前
发表于
航天技术
喷气推进
内容:最近二院招聘,面试管竟然担心男同学有女朋友,猜测女友工作不稳定,所以判断男同学容易跳槽。
23级加速器开工了
rye55357991
8年1个月前
发表于
电磁炮
内容:高速时误差会使蛋蛋错过放电尖峰,经过一级级地放大会和稳定性大大折扣。
2DW7,2DW232和2DW14系列电压基准的研究
研究黑魔法的生菜
1年7个月前
发表于
仪器仪表
电子技术
动手实践: 实验报导
内容:我个人推测2DW14C是配合恒温设备使用的,如果将工作电流设为10mA,并将温度稳定在55℃左右,则2DW14C可以工作在零温度系数点,恐怕会有比肩LTZ1000的温度稳定性。
准备搞把便携式电磁木仓,继续缓慢更新。。。。
whd1982
11年7个月前
发表于
电磁炮
内容:和六足炮相同),效率理论值8%左右,加速的还是7MM的钢珠,也就是说出膛动能3J出头,65m/s左右,调试好了估计实际效果60+应该没什么问题还是准备纯单片机触发不用光电,3级六足炮纯单片机触发的出膛速度基本很稳定
40mm发动机试车
Sugars
3年3个月前
发表于
喷气推进
内容:多次尝试制作但最终都以失败告终)总结上次试车的安全隐患XXXXXXXXXXXXXXXXXXXX/s/6nwvznut上次使用的导火索点火属于危险行为1.这并非真正导火索,而是烟花店买的烟花,点燃啪啪啪的那种,燃速不稳定
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
warmonkey
3年10个月前
回复于
科学技术学
内容:非常细的研究分支,做得非常深入,需要有稳定的发展环境,需要搭建一个体系。
最近几天做了个充电宝。。效率颇低
maximumt
11年10个月前
发表于
极客DIY
内容:充电电压稳定在12.8V。
DIY T12白光焊台求助
xiongfeixiang
9年4个月前
发表于
极客DIY
内容:AC80多V感应电压 测试都能点亮发光二极管;了测电笔测量有110V电压 如果电烙铁接,接地线是能消除感应电压 但又有一个新问题产生 接地后影响温度显示 数码管显示的温度数字上下乱跳 不能稳定显示设定的温度数字
【长期有效】8月新增270w电源!消费满500元赠送PSP2000游戏机一部!12V小电源\\电池
玄明
11年6个月前
回复于
跳蚤市场
内容:电压很稳定,基本保持在12+-0.8V之内。
620v IGBT半桥式 MCU开环控制 紧密加速线圈炮测试更新:七级已破百
莱特
7年0个月前
回复于
电磁炮
内容:10.25J,平均加速度23688.31第四级平均离开速度:76.42m/s,40.29J,ΔE=10.87J,平均加速度24332.90根据以上数据可以发现,能量一直是在平稳的增加中,加速度变化也非常稳定,没有用的原因主要是基于以下考虑:首先这是用于积累实验数据的测试机,薄膜电容最接近理想电容,在系统调试时可以较少考虑电容的影响;其次是即使在军事等实用中,体积并不是一个大的问题,性能稳定是最重要的。
PCR引物与酶相关知识总结
atlas
13年3个月前
发表于
农业
内容:当末位是A时,错赔率低,应避免引物3’末端的第一位是T,引物3’末端最佳碱基选择为G/C,配对较为
稳定。
,(1)热稳定性。
93 讲讲你玩单片机的经验
hwdz
15年11个月前
回复于
电子技术
内容:我从入门就是TI的MSP430,到现在也是,51倒是有几片,可是一直没有入门,还在那放着,倒是做过一51的ISP,也成功的烧录了一片STC的52RD,不过好像运行很不稳定,经常会当掉,因为不熟悉51,也不知道问题在哪
对于激光.窃.听.器.的一种构思,大伙看看可行不。
ehco
12年4个月前
回复于
电子技术
内容:假设:你使用74HC4046 载频最高稳定为10MHz,波长即为30米,周期T为1E-7(S)。
MIT中国男生:普林斯顿著名学者告诉我 不懂文科的理科生是狗
虎哥
10年8个月前
回复于
科学技术学
内容:相反,从历史唯物主义角度来看,如果没有科学理性就一定没有多元化,多元化是物质社会发展到一定阶段,人类的自然诉求和稳定形态,与人文学科没有直接的逻辑关系。
TL431 应用技术简单介绍 转帖 转自电源网
布布卡
14年11个月前
发表于
电子技术
内容:典型应用电路如下: 1:精密基准电压源(附图1)该电路具有良好的温度稳定性及较大的输出电流.但在连接容性负载时,应特别注意CL的取值,以免自激. 2: 可调稳压电源(附图2)Vo可在2.5~36V
Arduino Ethernet Switch现在支持继电器开关,纯手工洞洞板作品,还有竞猜
justinpiggy
12年11个月前
发表于
电子技术
内容:Shift Register),这是一个8Bit的移位寄存器,具有串口输出功能,也就可以组成菊花链(Daisy Chain),根据某些人测试发现74HC595可以支持到8个IC组成菊花链不产生错误,当然为了稳定在本电路中采用
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