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约找到 5783 条结果,耗时 0.333 秒
冒个泡,发个无用暴力的移动电源,结果真就没什么用
淡淡的花香
9年6个月前
发表于
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内容:140 mAh/g(0.2C,25°C); 安全性 是目前最安全的锂离子电池正极材料; 不含任何对人体有害的重金属元素; 寿命长 在100%DOD条件下,可以充放电2000次以上;(原因:磷酸铁锂晶格稳定性好
重刚体定点转动的两种可解情况的求解——欧拉-潘索情形与拉格朗日-泊松情形
某倒吊的亚雷斯塔
9个月20天前
回复于
物理
内容:好比手中有一个静止的理想陀螺仪,我希望维持在某个章动角稳定进动,那么我必须先根据(5.34)计算出应该满足的三轴角速度,拉绳子或者用电机啊之类的什么把陀螺仪的3轴角速度,也就是此时的自转角速度,陀螺转速,(现在相当于手拿着还没进动),提升到(5.34)的条件,然后再用手推一下,使得初始进动角速度满足(5.39.1),那么接下来它便会稳定进动了。
为什么地球一直没有被外星人侵略?
metellan
8年8个月前
回复于
天文与空间科学
内容:个人认为,智慧生物社会的稳定性与能材有某些可比性。
探讨发射小卫星的可行性及路线图问题
LC丶AI
12年2个月前
回复于
喷气推进
内容:箭体的飞行时稳定问题,卫星内部电路问题,卫星所用电池问题,太空射线问题,太空中卫星的飞行姿态调整问题,出问题后的自爆解体问题,回收时降落伞问题 卫星在太空中太阳能帆板的打开问题,远程遥控问题,GPS定位问题
微型塑料固体火箭发动机
xian333c
9年9个月前
回复于
喷气推进
内容:是微小的固体渣滓,火箭燃料的要求很简单:燃烧稳定,推力大!
【申请科创基金A】高能材料RDX球形化技术的探究
trample
12年6个月前
发表于
科创基金
内容:黑索今(RDX)是一种广泛应用于军事、航天、采矿和化工技术的高威力含能材料,黑索今经球型化后,可以大大提高其爆炸性能及起爆灵敏度与可靠性,同时又可改善其热稳定性。,3.本项目采取正交实验的方法,以探究最为合适的球型RDX结晶生产参数,方法传统,稳定可靠。
DIY激光雕刻,最好会单片(转自果壳)
1997224wts
12年5个月前
回复于
极客DIY
内容:它能让工作空间保持足够的稳定性,不过由于激光能够射穿它,所以我不确定这是否存在安全隐患。,这样工作空间依然非常稳定,而且强度也足够了。
新的低成本推力计套件
warmonkey
12年7个月前
回复于
仪器仪表
内容:如果20秒后没有灯亮,检查SD卡是否装好如果红灯亮,检查传感器接线绿灯亮后等待1分钟,然后按STOP键再把SD卡拔下,并在电脑上检查数据5.传感器标定启动推力计,开始记录数据然后在推力传感器上施加稳定的拉力,,例如悬挂砝码稳定10秒钟之后,停止记录,在电脑上检查数据根据数据的改变值,计算出1kg砝码引起了多少变化(推力标度因子)例如原来是-1400,放置2kg砝码之后变成3400,那么改变量是 (3400-
双氧水与三氯化铁反应
ca-139
13年6个月前
发表于
化学
内容: H2O2+2H+ +2e -=2H2O 1.776 V 可以看出过氧化氢具有很强的还原性,同时具有很强的氧化性,歧化反应的电极电势高达1.0V以上,歧化反应理应相当剧烈,但是由于过氧键有一定的稳定性造成实际上双氧水的歧化反应并没有那么强烈
国产DR电路模拟测试—— by冻土
冻土
12年5个月前
发表于
高电压技术
内容:所以,最后,我只好假设这个反馈信号是个稳定的信号源。
电工电子技术文章汇总——不能错过
yoto17
14年7个月前
回复于
电子技术
内容:混迭就是屏幕上显示的波形频率低于信号的实际频率,或者即使示波器上的触发指示灯已经亮了,而显示的波形仍不
稳定。
,可以通过慢慢改变扫速t/div到较快的时基档,看波形的频率参数是否急剧改变,如果是,说明波形混迭已经发生;或者晃动的波形在某个较快的时基档稳定下来,也说明波形混迭已经发生。
HP 5334A 频率计拆解
西葫芦
2年6个月前
发表于
拆机鉴赏
内容:10811高稳定恒温晶振选件。
多电芯串联锂离子电池的保护功能
公众号EV技研作者1900
5年6个月前
发表于
电动汽车
内容:进行基板设计和布局时,有必要将该影响因素 考虑在内,并且有必要将电源、接地的影响最小化, 以保证其稳定性。
玩ZVS。。。图在11楼
天狼晓月
13年0个月前
回复于
高电压技术
内容:另外,电容的热稳定性也是很重要的,工作中电容不可避免的要发热,温度变化若引起电容的容量变化,则准谐振状态也会被破坏,导致电路效率下降等问题,严重的甚至直接导致电容或其它元件烧毁。
解剖某纸质版发动机,有图有真相
wall哥
12年9个月前
发表于
喷气推进
内容:条形的一瞬间燃烧完毕,烟头点火 开伞剂燃烧后的纸 总结:四凯发动机的燃料是黑药,延时剂开伞剂均为不同比例的黑药,推进时部分主燃料和延时剂担任堵头的角色(参见内孔结构)起飞时深内孔燃烧,而后端面燃烧(也有人说会维持稳定的锥面燃烧
闪烁探测器的性能测试与简单能谱系统实验
AtomictekOWO
2年7个月前
发表于
核技术与核仪器
动手实践: 实验报导,严肃内容: 教程/课程
内容:但值得注意的是,由测得的工作电压可知闪烁探测器并未工作在坪区上,因此在能谱测量中对高压供电的稳定性要求较高,高压的漂移将引起分辨率、光电峰中心能量的变化。
Gamma能谱仪之NaI:Tl闪烁体探测器DIY
justinpiggy
4年11个月前
发表于
核技术与核仪器
动手实践: 实验报导
内容:这款DIY高压电源的输出纹波和稳定性基本秒杀市面上的高压模块,甚至比不少实验室内的高压电源性能更好,用在我这个PMT上实属overkill。
利用arduino和超声波测距模块制作的MIDI控制器
bg8npk
11年1个月前
发表于
电子技术
内容:下一步主要会提高整体的稳定性(舞台上对于稳定性的要求是很高的),制作一个符合人机工学的外壳(实用才是正道),以及制作无线midi接口等~~~ 欢迎讨论~~ (不想当吉他手的贝司手不是好程序员)
半桥驱动高压包
rb-sama
13年6个月前
回复于
高电压技术
内容:高压包会被烧坏 所以索性在两极加上金属夹作为放电电极[s:178] 此时的弧长输入电流为1.8A 满弧可以达到4.1A左右 ------------------------------------- 一个能稳定工作的电源必须计算出参数
那些妄图征服太空的核动力火箭
拔刀斋
11年4个月前
回复于
科学技术学
内容:设计中优化了阀门与喷嘴喉道间的管道长度,以提高气流的来回振荡频率,使喉道前气流能较快的趋于稳定形成新的驻室条件,有利于更快的获得稳定气体负载。,在性能测试中,利用高速相机和激光测量技术对阀门的瞬时抬起过程进行了测量,结果表明:阀门抬起高度约为1.8mm,电磁阀门打开的平均速度为12m/s,电磁阀动态密封效果好,性能稳定,开启时间抖动小于20μs,8.利用该套高灵敏度激光干涉测量系统完成了对Z箍缩喷气负载质量线密度的测量,获得了内单型面拉瓦尔喷嘴当储气室气压为0.4MPa时产生的超音速Ar气负载平均质量线密度(稳定值为70μg/cm)及其随时间变化的曲线,,实验结果表明电磁阀电流开始后1.6ms,在距离喷嘴出口10mm处开始有气流,再经过0.3ms后,气流达到稳定,稳态维持时间为0.4ms。
实用化的电磁炮充电用boost电路(原理图附
ryq1212
4年9个月前
发表于
高电压技术
内容:但是在变压器上下功夫限制又太大,额定输入多少伏就只能输入多少伏,即使电池电压出现波动输出的电压也会出现波动,还是不
稳定。
,整个控制部分用一个7812提供稳定的12伏电压,那个上古boost方案(原文)使用的是7809,但是考虑到9V的时候开关管可能导通不彻底,就选择了12V的。
镓铟锡合金的制备
火星居士
11年0个月前
发表于
化学
内容:主要原因是煤气灶火焰稳定,燃烧安全,操作简单,也有足够熔化三种合金组分的温度。 ,开始时我曾经考虑过使用我的石墨坩埚,因为石墨坩埚的热稳定性好,导热较快。
【实验】灯泡里镀钠
全变
14年5个月前
发表于
化学
内容:就像苯的标准生成吉布斯自由能>0,苯却是稳定的。,氯化钠熔点太高了,估计玻璃受不了;熔融的氢氧化钠会腐蚀玻璃;亚硝酸钙和亚硝酸钾都不如亚硝酸钠稳定,没试过,谁有兴趣的话可以试试。
[...]十六年造台计算机
phpskycn
13年0个月前
发表于
科学技术学
内容:当然超负荷运行是有风险的,一些电脑不堪重负而系统崩溃--这套拼凑起来的操作系统很不
稳定。
液机试车成功!
ehco
13年3个月前
回复于
喷气推进
内容:以至于点火不
稳定。
大家来讨论下太空战舰对轰用什么武器好。
闲着会生病的
9年0个月前
回复于
电磁炮
内容:引用 mmaer:激光、粒子束、电磁炮等至少理论上是可能的,现在好像还没有制造微型黑洞的技术吧,况且微型黑洞的效果也不一定好,越小的黑洞越不稳定,微型黑洞很可能刚产生就剧烈挥发而自爆了,而自爆释放的能量也不可能比制造这个黑洞的能量更强
回 18楼(whd1982) 的帖子
vcasm
11年5个月前
回复于
电磁炮
内容:没那么夸装,后面最后4级为了稳定速度,开通时间设定在前级没有关闭的时候,效率低很多如果不这样设计,结果就是两极分化特别严重,要么特别快,要么一下子回来到出口速度低于20更有意思的是昨晚为了测试视频,第一次很不理想
DIY激光雕刻,最好会单片(转自果壳)
1997224wts
12年5个月前
回复于
极客DIY
内容:它能让工作空间保持足够的稳定性,不过由于激光能够射穿它,所以我不确定这是否存在安全隐患。,这样工作空间依然非常稳定,而且强度也足够了。
第二届科创晶体制作大赛开赛通知
哈哈哈哈哈士奇
4年5个月前
发表于
晶体养成所
内容:(3)晶体必须是稳定、可长期保存的,熔点高于60℃,不得具有易潮解、易升华、易降解、与空气反应、易风化、见光死等特点。,采取真空玻封、气体保护玻封、透明树脂灌封等不影响观察和测量的专业手段加以保护并具有长期稳定存储条件的,可以不受易潮解、易风化、与空气反应等禁忌的限制。
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