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是谁 设计的这么精准严密的生物链............
acmilan
8年2个月前
回复于
生物学
内容:一些比较不稳定的分子和自由基自发组合起来了,其中某些组合真实起到了一定的效果,于是就出现了生命物质,这些生命物质又有不稳定的,就又自发组合起来了,其中一些组合真实起到了一定的效果,于是就有了最初级的生命
【Caesar】套件发布!!
caesar_king
10年6个月前
发表于
跳蚤市场
内容:周一到周五晚6点到10点,周六周日全天) QQ:490030064(备注科创) 此次发售三款套件: 一、经典ZVS套件 1.电路板材质为双面1.6mm军工板,大面积敷铜走线,大功率运行非常稳定,2.谐振电容采用保真优质丰明电磁炉谐振电容,大厂家好产品,稳定性极高 3.G极输入电阻采用3W 1%精度金属膜电阻,保证稳定性 XXXXS采用大散热片,保证在满负荷工作时电路的极致稳定性 5.所有元件均采用优质高精度元件
拆【安利MH648A】前置放大器
虎哥
10年0个月前
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仪器仪表
拆机鉴赏
内容:单支管子的mmic现在30dB的稳定增益还是比较难找,这个不大不小的增益,一般还是得用两支管子。
登天-4发射成功(图片视频贴)
山氰水溴
5年3个月前
回复于
科创基金
喷气推进
内容:谢谢建议,稳定装置和壳体使用3d打印技术制造,后期我也准备改进壳体,设计使用复合材料制造
简谈火箭不稳定运动
hypersonic_m
2年8个月前
回复于
喷气推进
内容:俯仰,偏航,滚转都是飞行器(包括火箭)的基本运动方式,这在任何一本飞行力学书里都可以见到,不是你所说的不稳定运动。,说火箭飞行的稳定性,就要定义稳定性是什么——和其它动力学系统一样,我们说的稳定性都是用的李雅普诺夫定义下的
稳定。
,火箭的稳定性实质上是运动方程解的稳定性:只考虑俯仰力矩的复攻角方程解的稳定性——静稳定;考虑俯仰力矩与陀螺力矩——陀螺稳定;考虑全力矩——动稳定;此外,火箭还有追随稳定,这是根据任务特性来的。
基于航模技术的探空火箭姿态自稳定装置
虎哥
9个月24天前
回复于
航空技术
喷气推进
内容:如果有鸭翼很容易静不稳定,靠这个飞控恐怕搞不定。
求教:超导体在磁场上悬浮起的那一瞬间是否能量守恒?
414984185
11年0个月前
回复于
物理
内容:不违反能量守恒,即使是超导体,一通电后电流也不是立即稳定的,而是有一个过程,磁铁上升的能量,就是在这个稳定的过程中变化的电流对其做的功提供的。
便携式,半自动,10级加速,12J动能,45米/秒,磁阻枪!
yszg268
8年11个月前
回复于
电磁炮
内容:引用 1642223032:弹丸怎么稳定的?,这种弹丸飞出去后不能稳定,威力不到一定级别稳定意义不大。
===扫盲贴: 仪表不太准,怎么才能测准未知量?===
RodTech
10年10个月前
发表于
仪器仪表
内容:1、平均值法 解决的问题与适用范围: 测量仪器噪声大(短稳差),但长期稳定性良好,比如某个电压表,测量1.00000000v电压,显示末尾数字经常在0.99999995-1.00000005,操作方法: 按照噪声大小与仪器实际情况,酌情(有数学依据地酌情)选择合适的测量时长,时间越长,平均值越稳定,测得越准,但是时间过长也不可,过长就无法忽略长期稳定性了。,2.背靠背法(B2B测量) 解决的问题与适用范围: 表的长期稳定性不好,不能单纯采用平均值法,但是在短时间内(比如10秒内)有很好的稳定性,且线性精度优良,又有一个非常稳定的参考基准。,这种方法经常与平均值法联用,事实上很少见到单独使用的情形,除非你的表真是太稳定了,测量时末尾数字一动不动。
双氧水和氢氧化钠能共存吗
焓熵`
14年1个月前
回复于
化学
内容:氢化过氧负离子趋于不稳定的状态!,而过氧负离子更加趋于稳定!,所以,反应方向趋向稳定态,so没有氢化过氧负离子存在,也可以说不可能稳定存在!,所以某童鞋所说的NaHO2是不会稳定存在的!!!
80W 输入55V 输出400V DC-DC推挽正激 SG3525闭环求助
掘坟看人
12年9个月前
发表于
电子技术
内容:芯片补偿脚波形不
稳定。
,3pi参数设置为100k 400n 时 ,曾经 进入闭环 稳定成功过,但是 那是偶然性。,二次板进闭环怎么都不
稳定。
[原创]我也贡献下,谈谈我对火箭稳定性的研究.
ABC
16年6个月前
回复于
喷气推进
内容:引用第9楼暗剑于2008-07-30 21:16发表的 :燃气舵与飞行的稳定是很有联系的。。。,才留意到你的回帖,我看不到你的资料,但我还是要提醒,燃气舵与火箭稳定(严格说是静稳定)是没有关系的,它只是个控制部件,与火箭的稳定因素没有联系,它不是稳定部件.当然,它能为火箭姿态提供控制力,就能通过飞行控制系统保持火箭的飞行,"稳定",这么一来就能和稳定有点关系,但这其实已经不是"稳定"了,而是制导.如果没有飞控系统而装了燃气舵,除了白白减小推力,没有其它作用了
40瓦的SGTC出炉了!来看看!
黑体辐射
12年5个月前
发表于
高电压技术
内容:开机后zvs工作不稳定,发现12v电源不稳定,就在zvs输入端加上了2uf的电容来稳定电压。
科学家确认117号元素
4869Aether
10年6个月前
回复于
化学
内容:稳定岛啊稳定到~
HP8565EC频谱仪的内部图
虎哥
3年0个月前
回复于
拆机鉴赏
仪器仪表
内容:最近这机器工作不太稳定,表现为关机以后不能马上开,长期开机后有时本振丢失,冷却后再开又莫名其妙恢复正常。
正在测试小UU外设部分(不定时更新)
神之觉醒
10年2个月前
回复于
计算机电子学
内容:原来CPU跑25MHZ不稳定..然后换成16MHZ跑一天了.,稳定..
【59元套件】 ‘Fulcrum’复用型铝合金固体火箭发动机套件预售中
CIT
1年10个月前
回复于
会员海报
喷气推进
内容:发动机推力有多少,能够稳定输出吗?
Hi-Fi音频电子管放大器制作实例(第1辑)-内购入口
UICalc
1年5个月前
回复于
会员海报
电子技术
内容:不过电子管这类东西去哪里找稳定的供应商估计成问题。
或许是首个太阳能球粉机
kebalstar
2年9个月前
回复于
机械与工具
内容:为什么直流“肯定”比交流稳定?,如果真的直流比交流稳定,那为什么产生的火花少?
请教改造玩具四轴的狂人
west_0830
8年11个月前
回复于
航空技术
内容:包括怎么去组装……但我想用最低的成本去完成稳定和可控性高的四轴……现在想着利用大量的成本玩具电路板,去进行改装。,想过利用四激光头和接收去控制四轴的
稳定。
,外加稳定的电机。
腐蚀硫磺七号
腐蚀硫磺
10年10个月前
发表于
喷气推进
内容:现在出现了个疑问,我用软件模拟的压心位置比较靠后,稳定性应该是可以的。,但是我用一根2米的线系住重心的位置,原地转圈使火箭绕着我做圆周运动,火箭不稳定,我从没加配重开始试,再加一点,再加多点,最后加到150g,可是头锥没有一次朝切线方向。,(难道是线太短了吗) 大家看我这枚火箭稳定性到底怎样?
示波器莫名其妙的噪声求解释
1176764177
9年10个月前
回复于
仪器仪表
内容:引用 Einstein:那就不好说了,输入不稳定输出可能稳定吗 输出挂了3个pi形低通然后用三极管做了一个有源滤波表示示波器噪声压倒1mvpp坑死了示波器底噪只有600uv。。
探寻低成本LM399电压基准的最佳电路
炭达人
2年2个月前
回复于
仪器仪表
电子技术
内容:多档开关是个好思路,比电位器稳定,不过想调到10.00000V,看起来也很费劲
回 49楼(novakon) 的帖子
lucifer
12年5个月前
回复于
软件综合
内容:VS2010这个我之前还真没知道……Ubuntu哲学那个这么说是有点早了……那么如果挑剔的话……看来要装Debian了……这货的稳定性我喜欢……就是软件源为了保守稳定性更新得真慢啊,而且用起来比Ubuntu,只有更需要了解计算机……><话说咱对床的同学为了体验GNOME3的Bug宁可不要稳定性遑论性能,这种敢为小白鼠的精神……= =
探究单级感应炮的初速和效率与电容储能-电容电压-线圈自感的关系
Ma3.02的守望
5年8个月前
回复于
电磁炮
科创基金
内容:4、”将来打算用于验证飞行稳定的定制弹丸”未见结构设计。,“感应炮实验”和“验证弹丸稳定性”应当是两个项目,后者也不必需感应炮平台。,建议在此项目中,使用普通铝棒/铜棒作为弹丸材料,如有“验证弹丸稳定性”的项目,再申请定制弹丸。
基于Arduino的开源可拓展四轴无人机
小丛雨天下第一
2年4个月前
发表于
航空技术
科创基金
内容:研究目标:飞控能对各传感器数据做到读取、回传;使得无人机能在电脑的远程操控完成正常的飞行动作;使得无人机能在弱风条件下达到较为稳定的悬停;能留下如位置、图像等的记录;做出一个稳定的地面无人机测试平台,以便在地面进行安全的测试,完成托管在GitHub上的代码的稳定版的更新。 ,但是由于PID的特性,我们并不需要知道马达提供的力矩滚转力矩确切是多少,便能通过经典的齐格勒-尼科尔斯方法使得无人机达到
稳定。
,并且由于外界环境的不确定性,无人机能否保持稳定悬停也是个问题。
T2升压模块,开坑!劝大家放弃ZVS
潜伏者
9年11个月前
回复于
电气电工
高电压技术
内容:引用 三水合番:单节锂电输入不用给芯片独立供电么 设计了电源管理,电源管理可稳定的输出11.89v3A和5.57v2A
关于炮姐转职生产硝酸钾这档事(完)
肖特基的救赎
3年8个月前
回复于
化工矿冶
内容:PS:把气隙加到2mm,电弧稳定性更好了
端面燃烧的一个问题?
glock
14年3个月前
发表于
喷气推进
内容:在此想和大家交流下,如果端面是个圆锥形,那在稳定燃烧的过程中是否还能保持这种形状?,换句话说就是能不能够产生稳定推力
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