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约找到 5781 条结果,耗时 0.385 秒
适用于火箭爱好者的遥控点火控制器KC107
虎哥
5年6个月前
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稳定。
转帖:H2O2-PE固液火箭发动机燃料退移速率研究
清纯小萝莉
12年5个月前
回复于
喷气推进
内容:当燃料表面温度到达910 K后,传热和热解达到平衡,表面温度趋于
稳定。
,两种作用平衡时,燃料的热解速率将保持
稳定。
,因此这种现象对发动机的燃烧极为不利,既降低了燃烧效率又可能造成发动机工作不
稳定。
,此外,PE燃料液体层的存在有利于提高热解速度,但液体层也可能导致燃烧效率下降和出现不稳定燃烧。
液机历程
乖雪狼
13年1个月前
发表于
喷气推进
内容:点火比较原始,由于此次燃料管还是为加止回阀,导致压力不稳定,有几秒喘喷现象。
龙吟一号固体探空火箭设计与制作
就是氧化铁喽
7个月25天前
发表于
喷气推进
动手实践: 实验报导
内容:头锥采用半椭圆形结构,使其能“钻开上方的空气”减少阻力因为3D打印机面积太小,所以采用了3D打印套筒加外部尾翼的方式(需要环氧树脂粘接),而且还极大的减少了运输包装难度以为装配视频Open rocket稳定性仿真此外还用
[实验展示] [原创] 简化版“班氏试剂”的配制——碳酸根离子对二价铜离子的络合作用初探
TBsoft
9年9个月前
发表于
化学
内容:或者柠檬酸根离子)也可以作为络合剂络合Cu2+,使得溶液不出现沉淀,这种溶液叫做班乃德(Benedict)试剂,又译作本尼迪克试剂,简称班氏试剂,也是著名的醛基(或者还原糖)检测试剂,班氏试剂比费林试剂稳定
从5.12救灾实际看业余无线电应急通信—在2009年五五节大会上的发言
虎哥
12年10个月前
发表于
无线电
内容:短波单跳传播比较稳定,在几十到一百余千米的尺度,用垂射天线在3至8兆赫能够实现相当可靠的联络。
一种低成本ppr固体发动机喷口的设想
悟死参玄
1年8个月前
发表于
喷气推进
动手实践: 实验报导,严肃内容: 教程/课程
内容:可以看到前期偏移,可能是由于导向孔中轴线未对齐导致偏移,不过后面的轨迹还算可以,可能是燃料质量减小导致重心上移提高了稳定性。
ZVS双管自激电路原理仿真分析
frival
12年9个月前
发表于
高电压技术
严肃内容: 专著/论述
内容:MOS管其实是存在一个互锁的状态,只要有一个导通程度比另外一个大一点,就会将这个优势正反馈过去,将另外一个管子的栅极电压继续拉低,以至完全截止,而它则能进一步完全导通;如果没有LC回路,它的状态是会一直稳定下去的
天文教材第一卷发布帖
客星晨出东方
1年10个月前
回复于
天文与空间科学
内容:氦闪产生大量的能量,但对于外部几乎不会导致恒星亮度增加,反而因为星核膨胀,吸热导致光度骤减,进入稳定的氦燃烧阶段,这样对于这颗恒星,其核心是氦的燃烧,其外部氢的壳层依然在燃烧,此时的恒星称之为氦燃烧星,,这种反应模式末期,核聚变的能量不足以维持核心稳定存在,核心即剧烈坍缩,温度剧烈上升,铁原子核随即分裂为氦原子核,一个氦原子核又分解为两个质子与两个中子,这两个质子俘获电子也形成中子,导致核心强烈的中子化,量子力学中的真空是所有正能态都空着,而所有负能态都填充一个粒子的状态,但是正负能态之间存在一个禁区,所以真空是稳定的,但是在有外加场(如电场,引力场)存在的情况下,负能态的粒子有概率穿透禁区,从正能态出射
DIY了个弹丸测速器~
千斤拨四两
10年7个月前
发表于
极客DIY
内容:为了体现 经济实用 稳定精确 皮实耐用 的原则, 又不想把开支搞大,初步想法: 1:核心不想搞的太差,准备用stc的高端单片机。
闭环步进电机驱动
m24h
1年2个月前
发表于
极客DIY
内容:需要长时间工作 噪声 发热 失步都是关键问题 而且一般皮带驱动 步距大 转速低 而且负荷低且平稳厂房工业驱动 控制代码简单 无论是皮带还是丝杆驱动 都有转速大 负荷大的需要 一般简单地来回 过程要求转速稳定
【原创】尝试理解我们的世界
zhiyangwork
10年10个月前
发表于
科学技术学
内容:凭感性想一想,假如现在这3.5万 个基因的状态是稳定的,突然有一个基因的状态改变,那么一定会激起一片状态改变的涟漪,基因之间的关系网会把这个涟漪放大并且影响到每一个基因,于是基因 就变成了躁动的海洋,每一个基因都会不停地改变自己的状态,好在事情的真相是,不论是哪一个基因的状态改变,最终基因们都会以某些特定的状态稳定下来。,他发现当基因关系网不 是那么稠密的时候,几百条基因组成的网络竟然出现了数量非常有限的稳定状态,而且稳定状态数大致相当于网络内基因数的平方根。,这说明每一个细胞类型都呼应某一种稳定的基因状态。,很明显,看似混乱的基因网络涌现出了极具秩序的稳定状态。
AR试剂的提纯【转】
123123123
14年1个月前
发表于
化学
内容:6.氯仿普通氯仿中含有1%乙醇(这是为防止氯仿分解为有毒的光气,作为稳定剂加进去的)。
电脑电源为什么不能为音响设备供电?
kuanglong7
15年3个月前
回复于
电子技术
内容:众所周知,专业功主要应用于迪厅、舞厅、舞台演出、体育场馆等场合,最需要的是高功率、高声压的连续输出,在计上主要追求在连续高功率输出的稳定性、可靠性,至于音质,只要没有明显的缺陷就可以了。
中国业余脑图计划-召集-算法-研讨-step1努力开始还原神经元,胶质模型
noya2012
11年1个月前
回复于
软件综合
内容:引起的有趣联想是,如果细胞也能感受到它腔体内的液体浓度和咸甜程度,那么这是一个更高维度的信息处理能力.但是这个需要液体很恒定的浓度,稳定的化学环境和温度,才保证信息的存储,我认为在生物内部环境中,这个稳定的化学环境和物理环境
[连载]EP-65:一台高压电磁发射器是如何炼成的
rb-sama
5年8个月前
回复于
电磁炮
内容:这个视频里还讲到了这类峰值电流控制的模式,相比CCM只有一个极点,更容易实现环路稳定控制。
『新手请教』几个关于自制火箭问题,恳请详解。
moskvich
17年8个月前
发表于
喷气推进
内容:(2)尾翼设计有什么原则,不同形状的尾翼空气动力学性能有什么不同,为保持航向稳定性推荐用何种形状的尾翼呢?
(已更新dark-ll的部分)[CZSA] (欢迎砖拍)国内业余界第一台35N固体燃料球状引擎试车及固体燃料柱孔球状发动机药柱计算方法
ERIC20041219
4年11个月前
发表于
喷气推进
内容:则:升推力段:药柱本身加工硬伤导致的燃烧不
稳定。
非线性结点探测器(半导体探测器,电子设备探测器)原理及实验验证
虎哥
6年3个月前
发表于
仪器仪表
动手实践: 实验报导,严肃内容: 专业科普
内容:另外,窄的带宽将对时钟稳定度提出过于苛刻的要求。
TPR恒压恒流高精度直流稳压电源剖析
mass_lynnxy
16年2个月前
发表于
电子技术
内容:另外,T3的基极电压是经过78L12稳压后再经电阻1kΩ到基极,使输出+15V保持稳定,输出+15V主要用在IC1与IC2集成运放电源及恒压和恒流电路的基准电压、交流电压切换电路的参考电压。
我对世界之认识
水滴石穿
19年2个月前
发表于
科学技术学
内容:像欧洲今天所存在的情况,已使得民主形式受到怀疑,这不能归咎于民主原则本身,而是由于政府的不稳定和选举制度中与个人无关的特征。
没有什么平等
latexles
14年9个月前
发表于
科学技术学
内容:因此不管是当年的20%落魄为如今的80%,还是当年的80%摇身一变挤进了如今的20%,大局总会是二八定律衍生出的金字塔结构,在动态中稳定,直到人类毁灭。
小弟求推荐一测真有效值的表,或者测真有效值的方法
拔刀斋
14年0个月前
回复于
高电压技术
内容:二极管具有负的温度系数,当温度升高时D1的压降会减小,但D2的压降也同样地减小,最终使输出电压仍保持
稳定。
,当闭环电路达到稳定状态时,输出电压U0(DC)就与输入有效值功率PIN成正比。,这种检测方法有以下优点:第一,由于两个平方器完全相同,因此在改变量程时不影响转换精度;第二,当环境温度发生变化时,两个平方器能互相补偿,使输出电压保持稳定;第三,所用平方器的频带非常宽,可从直流一直到微波频段
问题贴:新人关于磁阻式线圈炮原理的疑问,寻求前辈指导
zpanther
8年9个月前
回复于
电磁炮
内容:也相同,那么只需计算各级的加速时间,就可以计算出下一级的初速,这样可以一定程度避开前期电流上升过程中,磁力的非线性变化,而使变化集中在断电后瞬间电流峰值和衰减部分,计算量应该会减小,模块化设计,和效率的稳定性应该都能比现有的短时供电要强
Re:便携式100焦耳电磁加速器(收关在即,心情激动)目标:打鸟 不完美的
方旭
15年0个月前
回复于
电磁炮
内容:(变样的提高效率,这是我为便携式电磁枪量身定做的)这也是我重点要介绍的R1 R2 C3 是后加进去的原件,如果没有这几个原件,电路将实时监测输出电压,使输出电压严格稳定在700V, (但这样有一个缺点
制作一个自己的灭弧器
薛定谔的猫
10年4个月前
发表于
高电压技术
动手实践: 实验报导
内容:传统的555灭弧器普遍存在低ontime下不稳定,难以精确定量输出,数据不直观,RC设计繁琐,制作良品率低等问题。
探讨:文明之锁
铅球脑袋
6年1个月前
回复于
科学技术学
内容:没有一个稳定的温度,可能会让精密的脑活动运转失常。
零排放的环保轿车 试驾奔驰Smart ED
mass_lynnxy
17年4个月前
回复于
极客DIY
内容:它应该是电池领域的新星:高铁电池或超铁电池,它是一种新型可充电电池,与普通高能电池相比,该电池能长时间保持稳定的放电电压,而且比功率(w/kg)较高。,也就是说,由于高铁酸盐的氧化性较强,故可望构成电压较高的电池;高铁酸盐正极的放电过程是一个3电子转移过程,故可望构成比容量较大的电池;高铁酸盐分解的最终稳定形态是fe(oh)3或水合氧化铁,非但对环境没有任何危害,3.铁电池的放电曲线比较完美平滑,不但具有高的放电电流而且放电电压也比较
稳定。
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