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电子技术
内容:阻区中电流增加而电压则保持恒定,稳压二极管是根据击穿电压来分档的,因为这种 特性,稳压管主要被作为稳压器或电压基准元件使用.其伏安特性见图1,稳压二极管 可以串联起来以便在较高的电压上使用,通过串联就可获得更多的稳定电压,分布电容的存在使线圈的Q值减小,稳定性变差,因而线圈的分布电容越小越好。
浅谈“科学研究纲领”及其优越性
1211
5年11个月前
发表于
科学技术学
内容:硬核是不可反驳的,也是不可修改的,以此来保证理论在一个时期内的稳定性。
回 8楼(black) 的帖子
wanghailan9
13年2个月前
回复于
高电压技术
内容:不能放任不管 底座也一样 我之前为了稳定把整个特斯拉线圈初次级都固定在一块厚铁板上 弧长短了。
【原创】“人定胜天”之辩
wsygz08
13年1个月前
回复于
科学技术学
内容:按照“人定胜天,天定亦能胜人”的词语来分解,“定”的意思,应该理解为:“稳定”、“安定”、“达到定数”、“形成特定的势力”。,从而,增强社会生产实力,使社会经济稳定增长,就可能向自然界获得超额的收成。
一项自主创新技术挑战城市交通拥堵顽症
大仙
16年5个月前
发表于
极客DIY
内容:三、本系统具有很好的可扩展性、兼容性、稳定性和鲁棒性。
金属探测器的问题,比较急。
mass_lynnxy
18年3个月前
回复于
电子技术
内容:由于二极管正向阈值电压恒定(约0.7V),通过次级线圈L2加到VT1的基极,以得到稳定的偏置电压。,显然,这种稳压式的偏置电路能够大大增强VT1高频振荡器的稳定性。,新焊接的金属探测器如果不能正常工作,首先要检查电路板上各元器件、接线焊接是否有误,再测量电池电压及供电回路是否正常,稳压二极管VD1稳定电压5.5~6.5V之间,VD2极性不要焊反。
胆机的音频VU表(电平表)驱动电路
铅球脑袋
1年3个月前
发表于
极客DIY
内容:运放输出的负信号经过二极管直接进入运放负输入端,我没用负半周信号,只要他闭环,稳定反馈就可以,反馈多少不用考虑。
磁敏传感器
kltty
16年3个月前
发表于
电子技术
内容:当后续电路不同对供电电源的稳定性及内部噪声要求高低有所不同。
思维脑图训练——美与妙(6)
wofrly8
18年1个月前
发表于
科学技术学
内容:而当我们面对表格图观察冥想时,又可从中领悟到‘层次管理,井然有序’、‘左右控制、上下制约’、‘框架模式是最稳定的组织结构模式’等诸多智慧。
红磷知识大全
qwerrewq122
12年5个月前
发表于
化学
内容:红磷性质与稳定性 1.如果遵照规格使用和储存则不会分解,避免接触热,碱,氧化物 2.常温下不与卤素反应,在空气中不自燃,在暗处不发磷光,无毒,无臭。 ,然后加入1%氧化镁使赤磷
稳定。
基础化学常用英语词汇380条
thallium2012
14年4个月前
发表于
化学
内容:compound 配位化合物 223. center ion 中心离子224. cumulative stability constant 累积稳定常数,225. alpha coefficient 酸效应系数226. overall stability constant 总稳定常数 227. ligand
以前做的小论文 硝化理论发展 大家凑合着看吧
thallium2012
14年8个月前
发表于
化学
内容:在1910年就有资料【1】提出,硝化反应同氯化反应一样,首先是加成,随后由于苯环的稳定性而裂解。
室温电解制备碱金属单质(络合法)
锇钚铈锑
9个月9天前
发表于
化学
动手实践: 实验报导
内容:3、向铝阳极缓慢而稳定的通入干燥的氯气,生成无水氯化铝,然后发生络合。
[风行动]科创基金A申请:BY2HIT业余卫星小组活动
bg2bhc
12年6个月前
回复于
科创基金
内容:技术指标运行轨道:N/A姿态控制方式:对地三轴稳定控制测控通信:UHF上行/下行电源功耗:N/A有效载荷:温度传感器或其他简单传感器热控:N/A质量:不大于1 kg寿命:N/A3.
[转帖]树立正确的海洋观
玄明
19年0个月前
发表于
地理与地质
内容:因为这个水体所以有基本固定的形状,能稳定地发挥其功能,离不开包围和承载它的海岸和海底。,二、海洋矿产资源 矿物是由于地质作用所形成的天然单质或化合物,具有相对稳定的化学成分,呈固态者还有稳定的内部结构。
楼主的误区,和其他很多同学一样……
hambaby
14年6个月前
回复于
电子技术
内容:如果蒸发器冷凝除湿,势必导致排风湿度过低(导致静电问题影响产品质量或者危害电子计算机稳定工作),又需要额外消耗能量对空气进行增湿维持适当的湿度。
自己制作小型桌面电路板雕刻机,设备面板雕刻机,无线电爱好者的必备工具
charlesluzh
13年10个月前
发表于
跳蚤市场
内容:快速的设置和运行操作—— 本机的软件部分使用PC机上运行的EMC2雕刻软件,在LINUX下运行,性能稳定,机器与电脑之间通过一根USB控制线连接无须安装任何驱动程序即可正常运行,默认情况下无须改动设置,
激光制造技术的发展趋势
1211
19年2个月前
发表于
极客DIY
内容:前者为制造业提供性能优良、稳定可*的激光器以及加工系统,后者利用前者进行各种加工和制造,为激光系统的不断发展提供广阔的应用空间。,对小功率激光器,工作物质均匀稳定,一般可以实现基模输出,其光束横截面能量分布为高斯分布,且在传输过程中保持不变,光束质量较好;对于大功率激光器,一般不易得到基模输出,输出的往往为多模激光束,激光光束质量变差,选择适当波长的激光,通过各种优化工艺和逼近衍射极限的聚焦系统,获得高质量光束、高稳定性、微小尺寸焦斑的输出。
今天,我们实现了一个来自2021年的梦想——星云科技矢量火箭制作流程及开源计划
白沫0001
9个月11天前
发表于
喷气推进
内容:此时的火箭结构部分我们换用了桁架蒙皮结构,发动机也从最开始的PPR机换成了碳纤维机,增强了稳定性的同时也易于装配。,发动机前后用法兰盘和螺杆夹紧,做进一步的固定,提高发动机的稳定性。
【水】【原创】简单的分析一下业余火箭发动机的技术路线
154454496
5年7个月前
发表于
喷气推进
内容:成本:60-100元每千克,真空仓100元以上8、AP-PU(包括AP-HTPB)优点:比冲高,文献众多,燃速可调范围广,综合性能最佳,安全稳定缺点:贵、涉及到的管制材料多,点火复杂困难,对发动机要求高业余界成果,至少硫代硫酸钠就算管了也有门道能整(初中物理八上)),简单的制造工艺,壮丽的火焰(适合做烟花)缺点:低比冲(不过也能过百,这导致其密度比冲直逼AN系,特殊用途尚有出路),燃速太快,资料太少,工艺玄学不稳定业余界成果,或许可以省下保温层的死重比液氧多的缺点:管制(虽然可以用硝石明矾一块熬熬出来@浪里黑条),强腐蚀性,比冲偏低成本:硝酸10元/500ml5、硝酸+肼/胺类推进剂优点:两个组元均为常温,可以自燃,各个组分均比较稳定,技术基本成熟7、低浓度(<60%)过氧化氢方向优点:成本低,常温可储,安全可靠,管制相对较弱,发动机工作温度低缺点:比冲低(配合无水肼也不过200多秒),点火困难,可查的相关文献太少(以前有人做过,但是燃烧不稳定严重,)8、单组元肼推进剂优点:易于土法制备,比冲相对较高,相对稳定(不想过氧化氢掉进粒灰去可能都是惊天动地大爆炸),文献资料丰富缺点:毒性巨大,点火困难,催化剂昂贵等成本:20元每千克左右(100%水合肼,
通报:沉默的来信
虎哥
13年4个月前
发表于
喷气推进
内容:本试验是一项较大的系统工程,需要有一个团结、稳定和高效的核心团队来组织实施,彼此间应分工明确,又能紧密配合。
【教程】基于C语言的Windows编程入门
acmilan
9年5个月前
回复于
软件综合
内容:出于稳定性考量,Visual C++编译器中int、long等基本类型基本上没有变化(16->32仅int变化了一次,64位没有变化),但是指针则16位、32位、64位一直在变化,为了更好地适应指针的变化
生命是什么?E.薛定谔
thallium2012
14年9个月前
回复于
生物学
内容:我们在前面说过:“以负熵为生”,就象是有机体本身吸引了一串负熵去抵消它在生活中产生的熵的增加,从而使它自身维持在一个稳定的而又很低的熵的水平上。 ,这样,一个有机体使它本身稳定在一个相当高的有序水平上(等于熵的相当低的水平上)的办法,确实是在于从它的环境中不断地吸取秩序。
探讨一下“绿色环保蚀刻剂”的成分
TBsoft
9年6个月前
回复于
化学
内容:2.05V(相比之下高锰酸根离子在酸性环境下的标准电极电位也只有1.51V),因此过硫酸盐氧化铜的反应在热力学上是非常有利的,但在动力学上却不利,如果没有适当的催化剂,反应速率极慢,原因是过硫酸根离子比较稳定
CPPO荧光实验与中性核心数据共享
pound_tatp
14年0个月前
回复于
化学
内容:注意:严格讲一种荧光染料一种配方,本实验中荧光染料鱼溶液B时专门组合的,如若使用其他荧光染料则本实验数据将不能再保持
稳定。
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