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zpanther
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内容:,这时控制电流衰减的速度,使其能让弹丸保持磁饱和,这时线圈内电流仍然是在做功的,而且是效率最高的做功(想象两个磁铁,磁饱和时弹丸是一个磁铁,线圈中点有一个磁铁,彼此相吸,衰减过程中弹丸保持成为一个磁力稳定的磁铁
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thallium2012
14年9个月前
发表于
机械与工具
内容:实现的条件:(1) 外界提供能量,将低能级的电子激发到高能级上 ; (2)材料的高能级有相对的稳定性,即存在亚稳态能级1、什么叫马氏体相变,其基本特征是什么?
全球业余卫星概况
科创喵
3年7个月前
发表于
无线电
内容:每个数据帧的遥测数据由星上微处理器实时更新,虽然希望一号卫星现在仅有一台信标发射机工作,但其优异的设计及稳定的性能使其成为业余卫星中的长寿星,至今仍然在轨运行。 ,图13 CAS-7卫星实验图CAS-7B为1.5U立方体卫星,卫星一面由直径为500 mm,质量约3kg的软性薄膜球覆盖,卫星由气动阻力帆被动控制轨道来保持稳定,卫星运行在300km高度圆轨道,轨道倾角,但是它安装了一个创新性的磁场姿态稳定系统。,UO-9卫星的摄像机并没有稳定地指向地球,所以照片所涵盖的区域也是随机拍摄的。
数控机床开机调试
liulong84
19年0个月前
发表于
电子技术
内容:将状态开关置于JOG位置或MDI位置,进行手动变档试验,验证后将主轴调速开关放在最低位置,进行各档的主轴正反转试验,观察主轴运转的情况和速度显示的正确性,然后再逐渐升速到最高转速,观察主轴运转的稳定性。
LED照明知识(第二部分):降压结构的实现
mass_lynnxy
16年4个月前
发表于
电子技术
内容:拓扑结构的选择应该考虑最少的外部原件和最好的性能为标准,这样可以提高电路的稳定性和减少成本。
场效应管(MOSFET)检测方法与经验
超级用户
16年0个月前
发表于
电子技术
内容:此时栅极是开路的,管的反向电阻值是很不稳定的。,因为功率型场效应管在高负荷条件下运用,必须设计足够的散热器,确保壳体温度不超过额定值,使器件长期稳定可靠地工作。
手工研磨刀具
彩虹之巅
12年7个月前
发表于
机械与工具
内容:拿来磨刀稳定性以及研磨效率太低!,(研磨刀尖) 研磨中最重要的是整个过程中保持稳定的角度不变,哪怕中途去吃了饭或者约了会,继续时都必须保持一致的研磨角度。
改写历史的国产DR驱动电路!
冻土
11年11个月前
发表于
高电压技术
严肃内容: 专著/论述
内容:另一方面,555的稳定性值得质疑(我买的那些TI原厂的555估计可以,但是市面上八毛一片的低质量555,我不说什么了)。
用ZVS驱动SSTC的可行性分析与讨论
rb-sama
8年8个月前
发表于
高电压技术
动手实践: 实验报导,严肃内容: 专著/论述
内容:2:工作非常稳定,不容易烧毁,且自控追频。
临界希望
zhuyaohua
16年7个月前
回复于
化学
内容:因此,脱离复杂的工艺,返朴归真地发现一种简单的、仅由两种元素构成的、稳定的、便宜得可以随意地在化学试剂商店买到的东西具有超乎寻常的超导性能,实在不能不让物理学家们奔走相告,并且议论纷纷。
世界导弹与航天发动机大全&世界航天运载器大全 扫描pdf格式分享 可直接下载
UIC
5年7个月前
发表于
喷气推进
内容:侦察兵 侦察兵 侦察兵 使用型侦察兵系列 侦察兵A 侦察兵B 侦察兵B-1 侦察兵D1 侦察兵E/F1 侦察兵G-1 蓝色侦察兵系列 蓝色侦察兵Jr 蓝色侦察兵Jr改型 蓝色侦察兵I 蓝色侦察兵Ⅱ 带旋转稳定顶级的蓝色侦察兵
哈耶克:知识在社会中的应用
虎哥
11年3个月前
发表于
科学技术学
内容:经济学家们越来越容易忘记组成整个经济体系的经常不断的小变化,其原因之一也许是他们越来越耽于统计总数,这种统计总数比具体细节的运动表现出更大的稳定性。 ,然而,这种统计总数的相对稳定性并不能像统计学家时常想做的那样以“大数定律”即随机变化的相互补偿来解释。,我们必须处理的因素,其数量并非大得足以便这些偶然力量产生稳定性。
可拓学的科学意义与未来发展
1211
19年1个月前
发表于
科学技术学
内容:节域概念表达了事物的质所规定的量的变化范围,当量的变换在节域范围内进行时,质就保持它的稳定性;当量的变换超过节域的范围时,就会导致质的变换。,与此相对应的是可拓集合的稳定域和可拓域。,3.4.2 与工程科学的交叉融合 控制与检测领域中存在大量的矛盾问题,如控制中准确性、稳定性和快速性的对立,检测中检测参数与检测仪器不能检测的矛盾,检测仪器的要求与检测环境的矛盾等等。
MSO大比拼
mass_lynnxy
15年9个月前
发表于
仪器仪表
内容:如果4000系列数字通道的传输延迟的时间和温度稳定性足够好,MagniVu就是查找信号漂移的理想工具。,当状态数据被同步采集,而非时序信息被异步采集时,由于状态在被采集时是稳定的,所以小量的通道和通道间偏移就变得不那么重要。
化学实验基础知识
神箭凌霄
16年1个月前
发表于
化学
内容:晾干: 洗净的仪器可倒置在干净的实验柜内仪器架上(倒置后不稳定的仪器如量筒等,则应平放),让其自然干燥。,若无机物对热是稳定的,可以接加热(应先预热),否则用水浴间接加热。
[原创] [化学实验展示+理论] 从稀硫酸的制备说起——化工生产基本知识入门
TBsoft
7年7个月前
发表于
化学
内容:尽管亚硫酸的酸性较强(Ka1≈1.54×10^(-2),pKa1≈1.8,准确地说,这是假定溶解于水中的SO2完全生成H2SO3的情况下),强于磷酸(pKa1≈2.1)甚至硫酸氢根离子(pKa≈2),但亚硫酸不稳定容易分解为水和二氧化硫,+ H2OH2SO5 + H2O + SO2 → 2H2SO4H2S2O8 + 2H2O + SO2 → 3H2SO4H2S2O8虽然有很强的氧化性(氧化性强于H2O2和KMnO4),但在动力学上较稳定不易水解
【原创帖】KNSB模型火箭理论计算与实践
inception
12年3个月前
回复于
喷气推进
内容:另外,同一直线有两种情况(1)压心在上 (2)重心在上 易证只有压心在重心下时,准确的说是压心在重心下至少D的长度才稳定,所以箭体设计应保证压心在重心下D的长度。
[转帖]功放IC之使用
mass_lynnxy
19年2个月前
发表于
电子技术
内容:TDA2030A功放IC金属片上的发热温度也要达到115度时才关断输出,所以他有一个不稳定工作的温度段,好在这个温度段已是很高的温度,对使用没有明显的影响。
【求助】电蚊拍变压原理?
守望幸福
13年8个月前
回复于
高电压技术
内容:经过几个周期以后,C2充电到L3电压的2*根2倍而达到
稳定。
无线电测向运动基本技术 - 转
mass_lynnxy
16年10个月前
发表于
无线电
内容:收音机中为提高音量稳定而设置的自动音量控制电路,不能用语测向机。
[转] 氨经济与中国的长盛久安
拔刀斋
16年9个月前
发表于
电气电工
内容:自力更生以可再生燃料特别是氨,来实现中国的能源自给,不仅能为中国的长盛久安提供必要的基础及保证,亦更将有助于中国在为促进世界的繁荣和稳定的事务中发挥其所应起的作用。
中继台(接收机)的灵敏度极限能做到多高
虎哥
1年7个月前
发表于
无线电
内容:我不能保证文章绝对严谨,当然网上的错误观念更是铺天盖地,而观念错误就不可能稳定的设计出最优的作品。
世纪之毒——二噁英
博丽灵梦
10年8个月前
发表于
化学
内容:计算结果证明,TCDD体系极其稳定,难以分解。
KC761x便携式伽马能谱仪固件升级指南及升级文件下载
kcma
4个月22天前
专栏文章
科创仪表
内容:10、提升提示音稳定性,取消按键连按音效。
一种新型硬件通信协议
谁叫小明
3年5个月前
发表于
电子技术
内容:直接使用打包后的库文件极其方便,代码逻辑结构清晰好写,完全不需要设定波特率,这样的通信协议传输数据紧凑,速度快,错误率极低(不讨论接线稳定性下),小明协议可以完成日常调试下的一些参数外部显示等功能(好像作用不大
21世纪的十大超级武器
mass_lynnxy
18年10个月前
发表于
极客DIY
内容:一是气象型,即利用云和大气中微粒的微观不稳定性,人为地制造出洪暴、干旱、闪电、冰雹和大雾;利用风能、潮汐能和海底聚合能量等人为地制造海啸、海浪;利用大气中垂直不稳定性人工引起飓风、龙卷风以及台风等自然灾害,地壳中隐藏的热应力分布不均,具有极强的不稳定性。
【高中化学知识归纳】金属、非金属及其化合物重要方程式集锦!
mithril
16年0个月前
发表于
化学
内容:NH4Cl=NH3+HCl 133、碳酸氢铵受热分解: NH4HCO3=NH3↑+H2O↑+CO2↑ 134、硝酸铵和氢氧化钠共热: NH4NO3+NaOH=NaNO3+NH3↑+H2O 135、硝酸不稳定性
燃料电池系列之三——氢氧燃料电池功率影响因素的研究
火星居士
10年9个月前
发表于
化学
内容:上次用9v方块电池充电十分让笔者抓狂,因此笔者从旧航模上拆下来一块12v锂电池组,输出电压十分稳定,容量特大。
全国大学生电子设计大赛题目 电子类爱好者可以尝试
loong
13年5个月前
发表于
电子技术
内容:、任务设计并制作交流变换为直流的稳定电源。,(3)输出频率稳定度:优于10-3。,(2)采用锁相环进一步提高输出频率稳定度,输出频率步进间隔为100kHz。,(3)增加自动增益控制(AGC)功能,AGC范围≥20dB,在AGC稳定范围内输出电压有效值应稳定在 4.5V≤Vo≤5.5V内(详见说明4)。,b.能利用模拟示波器清晰稳定地显示所采集到的8路信号波形,并显示触发点位置。
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