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发表于
电子技术
内容:实际焊接需要,每根两端各留出5mm 由于表面过于光滑而且有氧化膜,直接镀镀层强度低,所以先进行腐蚀 结果这玩意化学稳定性还不错,硫酸啥的根本不行(之前扔到稀硝酸里一根废料,现在过了快一周了,一点变化都没有
回 25楼(虎哥) 的帖子
yanli12321
12年3个月前
回复于
科创基金
内容:如果这台样机能够稳定工作即表明此电路已达到适用水准,可以向外界推广应用。
CVD金刚石的市场前景及应用
流落到四川
5年3个月前
发表于
晶体养成所
内容:金刚石是自然界存在的特殊材料之一,具有最高的硬度、低摩擦系数、高弹性模量、高热导、高绝缘、宽能隙、高的声传播速率以及良好的化学稳定性等,如表1所示。,其主要特点是等离子体中电子密度高,产生原子H的浓度大,没有电极污染,能够在较大压力下产生稳定的等离子体,生长的金刚石膜的质量较高。,设备的使用操作简便,设备本身没有易损易耗件,能长期稳定运行,生产的重复性好。,所以国际学术界公认“微波等离子体CVD法是稳定生长纯的均匀的高质量金刚石膜的最有前途的技术”。
制作一种收音机扫频仪的专用放大器。手工打造,直播贴
铅球脑袋
4年6个月前
回复于
电子技术
内容:另一个难点是稳定的抬高电压,也就是把0V左右的信号,都抬高1.4V左右。
关于组建个人电子技术实验室装备的一些探讨
cycloneman
13年11个月前
回复于
电子技术
内容:铅在自然界中有4种稳定同位素:铅204、206、207、208,还有20多种放射性同位素。
围栏设计的教训
ビリビリ女
13年10个月前
回复于
科学技术学
内容:春运时买票的队伍可以排几公里长,世博会更甚,每个场馆门口都是各种排队走廊与安保人员,虽然难免有人插队,但秩序总体上还是比较稳定的,百万的人流也没有出现踩踏伤人的事故。
就一张图我已近阵亡
frund6rm
12年5个月前
回复于
科学技术学
内容:13.发现了丙醇的溶沸点高于乙酸是醇类物质的不稳定性所造成的。
一个敏感话题:为啥在文明国家,社会丑恶现象会被群起而攻之,而在中国会被群起而效
laji3865689
12年8个月前
回复于
科学技术学
内容:ZF提供了一个相对稳定的环境,让国际上的力量不至于时刻威胁着民族生存,这就够了。
2005年中国日化市场状况
1211
19年2个月前
发表于
极客DIY
内容:从市场结构变化看,化妆品市场略有增加;洗涤用品、口腔、其他日化市场比例略有减少,整体上日化产品结构基本
稳定。
,2、从市场供给看,洗涤和牙膏市场集中度高,市场规模稳定;化妆品高端市场被跨国公司垄断,中低端市场竞争激烈。 ,从细分市场看,洗发护发品市场容量渐趋饱和,增长速度开始减慢 ,但其中美发市场增长较快;护肤品已进入快速发展阶段,市场规模有一定幅度的提高 ,但不大稳定,仍处于多品牌竞争状态;美容用品及香水市场容量远未趋于饱和,从细分市场看,洗衣粉市场保持稳定;皂类市场容量一定时期内趋于饱和,增长速度缓慢 ;液体洗涤剂(含个人清洁的洗手液、沐浴露;物品洗涤的洗洁精;衣物洗涤的洗涤剂;其他液体洗涤剂等)市场规模有一定幅度的提高
闭环步进电机驱动
m24h
1年0个月前
回复于
极客DIY
内容:半开环算法基本已经稳定 趁还有点时间 开始写PID及其测试PID算法是简单的 我这么说不是高兴的 而是无奈的 我曾经加了杂七杂八的东西 期待优化它 但是最后几乎都一一取消 首先是系统复杂度和敏感性 远超理论,否则极可能导致震荡 我曾经想计算一个伯德图出来 但是看到传感器那复杂的动态曲线 已经觉得其他部件的相位延迟没有必要考虑太多了 Ti应该至少覆盖传感器带来的延迟 目前我这里测试下来 Ti应该是100个采样周期才能比较稳定,这些地方应该是连续光滑的 可以自己脑补个正弦波形补上从理论上说 TD可以随意增大来抑制过冲 然而实际上 这是不可能的 因为TD会放大各种噪声 非线性 传感器的错误等等 比方说 当TD为100时候 所以 需要先确定系统的稳定局限在哪,本身无法避免过冲的时候 虽然KF=0时候 可以变为纯粹的微分先行 能减少输入变化带来的过冲 但是设为0恐怕会影响对输入响应的速度 这点在这个测试中不一定看得出来(被系统本身的过冲掩盖) 就以上参数 目前测试下来稳定性,: 稳定 没有震荡 用手施加扭矩 基本没有松动感 略微有反馈计算负担(主循环速度): 空闲时 93次/ms 算法启动后 49次/ms 加上RS485满速率工作 38次/ms 最高也是17转每秒静态和跟踪测试如下图当动态跟踪的时候
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
10个月9天前
发表于
物理
内容:以下是本文的目录:前置知识(主要以简要说明+链接的方式呈现)重刚体定点转动可解情况的分类对称欧拉潘索情况的求解(这里我将发周衍柏先生的理论力学教程里的推导的图片)一般的欧拉潘索情况的求解、对称情况的推导及刚体转动的稳定性讨论拉格朗日泊松情形的求解刚体一般运动的简要讨论应用的讨论好啦
KC908频谱仪固件升级指南及升级包下载
kcma
4年7个月前
发表于
仪器仪表
内容:主要解决上一版本出现的迫在眉睫的问题,软件的稳定性有所提升。,该版本对设备工作稳定性有较大改善。,同时修复了一些交互界面的问题,提高设备稳定性。,另有一些性能和稳定性方面的优化。,此外,对数字解调的稳定性有所优化。
逻辑ic实现256级delta-sigma PSM调制。
novakon
11年1个月前
发表于
高电压技术
内容:再加两个4bit加法器以及两个8bit寄存器的话,可以实现16bit=65536级调制,但是整个电路的最高工作速度会降低(加法器串联,输出稳定时间变长)。
鞭状天线驻波/谐振点测试的学问
虎哥
3年11个月前
发表于
仪器仪表
无线电
严肃内容: 教程/课程
内容:4、不论比较天线,还是比较仪器,都应使用相同且稳定的测试条件,仪器的形状是测试条件的一部分上面的演示中,不同仪器测量同一个天线,产生了截然不同的结果,当然可以怀疑其中一台或者两台都不准。
无土栽培中配制营养液时对水体积的测定!
lib
11年7个月前
发表于
农业
内容:注意:其药剂的溶液性质应较稳定不易受光、热、时间等理化条件影响其化学稳定性。
关于气球30000米以上高空摄影问题初步构思
极度深寒
10年2个月前
回复于
航空技术
内容:(我买了但还没做测试,我们实际上天的是物理陀螺仪(国外叫gyro bowl或者gimbal我不太清楚确切的翻译) 具体原理和 葡萄花鸟纹银香囊 一样,那个就不需要用电完全的机械结构达成的稳定,当然效果没有用电的那么好了
到货:STM8S103F3Px 开发板
novakon
11年4个月前
发表于
电子技术
内容:SPI,I2C,串口,定时器,看门狗,低延迟中断,2.9-5.5全电压范围全速稳定工作。
犯了一个低级错误,损失惨重!
彩虹之巅
11年9个月前
发表于
喷气推进
内容:经过几次试验,发现全部用KNSU,容易爆,全部用KNSB,初速上不去,火箭稳定性差,所以想到了用混合燃料,现在看来KNSU和KNSB混合燃料效果还是不错的。
不用任何化工材料制备高纯度三碘化氮
锇钚铈锑
1年2个月前
发表于
化学
动手实践: 实验报导
内容:三碘化氮是深红色固体,因其稳定性弱,所以是一种敏感性极强的爆炸物,少量即可引发爆炸而发出噼啪声,伴随有紫色碘蒸汽的生成。
电工电子技术文章汇总——不能错过
yoto17
14年9个月前
回复于
电子技术
内容:答:低频脉冲直流电经过二极管整流后,再由电解电容滤波,这样,输出的就是不同电压的稳定的电流了。,受控启动后,PW-OK在开关电源输出电压稳定后再延迟几百毫秒由0电平起跳到+5V,向主机输出高电平的信号。,答:额定功率是指电源在稳定、持续工作下的最大负载,额定功率代表了一台电源真正的负载能力,比如,一台电源的额定功率是300W,其含义是每天24小时、每年365天持续工作时,所有负载之和不能超过300W。,但实际上,电源都有一定的冗余,比如额定功率300W的电源,在310W的时候还能稳定正常工作,但尽量不要超过额定功率使用,否则可能导致电源或其他电脑部件因为过流而烧毁。
基于微孔雾化片的雾化器制作
0x00000000
5年6个月前
回复于
电子技术
内容: 工作视频展示: 结论及反思:本设计实现了一个雾化片的驱动方案,经过实际测试验证,电路的各功能基本正常达到预期,长时间的工作表明该电路能稳定工作。
4MHZ 高频微型SSTC 【Class.E SSTC v0.09】
joyeep
14年8个月前
发表于
高电压技术
动手实践: 实验报导
内容:对于输出的波形,和老外的是保持一致;频率稳定在4.096MHZ 。
[机器学习笔记#3] 简明Lagrange multiplier(拉格朗日乘数)讲义
Cirno
8年5个月前
发表于
软件综合
内容:\( \nabla g(x)\)不共线,\(\nabla f(x)\)将在该点有一个切向分量,x可沿该分量方向运动,到达一个使 \(f(x)\) 更大的点(参考gradient ascend),最终会稳定在一个使得
目标!12.7毫米电磁驱逐舰主炮
六分仪
10年9个月前
回复于
电磁炮
内容:按照余量最大化的高稳定思想,8*60,480/3,结果是。。。
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