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约找到 5783 条结果,耗时 0.284 秒
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回复于
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发表于
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16年6个月前
回复于
喷气推进
内容:直径0.06mm,理论电阻值为502Ω/m,突出的问题是难以采用常规工艺锡焊,普通的助焊剂根本没有办法对其搪锡……相对比较可靠的方式是采用脚线压接的方式连接桥丝,可靠性还是有问题的,压接的接触电阻值并不稳定
菜鸟造火箭
vip2005pig
11年4个月前
回复于
喷气推进
内容:那根长的有12cm长,燃烧时间约23秒,燃烧状况比较稳定,唯一遗憾没有打开录像,录下视频的只有那个短点三角形的硝糖,后面部份有明显裂纹,从视频上看燃到后面有裂纹部份就爆燃了。
【Caesar】双电感ZVS波形发布!!
caesar_king
10年7个月前
发表于
高电压技术
内容:具体改动如下: 1、谐振电容并联TVS,防止浪涌损坏MOS管; 2、使用LM2596模块稳压至12-20V对G极供电,输入电压变化G极电压不变,稳定; 3、G极电阻换用430Ohm,明显看出驱动波形陡很多
回顾经典:精密电阻测量仪器原理与华氏电桥的自制
虎哥
3年2个月前
发表于
仪器仪表
动手实践: 实验报导
内容:低灵敏度的电桥,势必要提高电源电压来补足灵敏度,那样会造成发热大,温度稳定性不佳,指标降低等弊病。,这样不仅要求参考臂降低为1kΩ,更主要的是接触电阻和开关有可能引入干扰和热不
稳定。
,Rd的设计规格与RA和RB一样,要求短期稳定度高、噪音低、功率系数低。,经过对比,这样的设置比采用8位半的3458A要稳定10倍以上。,这个指标,比1年前说的0.03ppm的自稳定性(不切换)还要高。
高档硅胶 万用表笔14.8元包邮迷你USB灯0.99元一个伟哥数据线T12烙铁头
黑石头
9年11个月前
发表于
跳蚤市场
内容:超高密度铜网+铝箔双层屏蔽,数据传输快速
稳定。
再论栅极谐振驱动的理论依据和应用范围
rb-sama
7年5个月前
回复于
高电压技术
内容:3:增益为1的点,称为系统的交越频率点,位于这个点右边,即使系统相位通过Compensation后,满足要求,由于系统输出高于激励输入,最终会出现衰减振荡,缓缓停止工作,或者由于某种激励处于不稳定工作的状态,简单来说就是:LC谐振回路应用在自激小TC上,实际对反馈回来的激励信号,起一个补偿、选频的作用,这个作用对于谐振的建立,稳定工作都是有非常积极的作用,适当合理的栅极驱动环路设计,不仅能够减轻MOS驱动在高频应用下的损耗
沙漏到底会不会轻?
虎哥
1年0个月前
回复于
物理
内容:流柱的重力是较为稳定的值,而冲力是高频脉冲。
重接式电磁技术(专题讨论贴)
ahzds
18年3个月前
发表于
电磁炮
内容:重接式特点:(1) 重接式电磁发射的弹丸与线圈无接触、无烧蚀和欧姆损失相对小得多;(2) 重接式电磁发射每单位长度传递给弹丸的能量要比其它电磁发射方式多得多;(3) 重接式电磁发射中的弹丸在飞行中有很大的稳定性
CO2 激光束几种聚焦方案的比较
我说要有光
15年9个月前
发表于
强激光
内容:我们在实际应用中曾出现这样的情况,焊接开始时在材料表面已形成稳定的等离子体,几秒钟以后等离子体出现不稳定甚至消失,无论怎样调整焦点位置也无法达到开始的状态。,反射聚焦的最大优点是镜子材料可以使用质量稳定,导热率好的紫铜,钼或硅制造,并且可以对镜子整体充分冷却。,4、金属球面反射聚焦 我们知道从一个特定稳定腔激光器发出的激光〔2〕,无论怎样用共轴球面光学系统进行变换其发散角与腰斑直径的乘积都是一个常数k,即:W0×θ0=W0’×θ0’=k 其中W0为变换前的腰斑直径
手动车床,单点钻石车尝试
RodTech
3年7个月前
发表于
机械与工具
内容:另一个致命原因是铸铁热伸缩厉害,需要非常夸张的恒温才能稳定的走完长时间刀路不出毛病,很不现实。
57mm*3mm*360mmtc4钛合金发动机,将会是国内业余界最大的钛机
LShang001
9年10个月前
发表于
喷气推进
内容:α+β钛合金 它是双相合金,具有良好的综合性能,组织稳定性好,有良好的韧性、塑性和高温变形性能,能较好地进行热压力加工,能进行淬火、时效使合金强化。,热处理后的强度约比退火状态提高50%~100%;高温强度高,可在400℃~500℃的温度下长期工作,其热稳定性次于α钛合金。
这个东西是真是假
kuanglong7
15年1个月前
回复于
化学
内容:这种氧分子可以稳定存在,预计构型为正四面体或者矩形,从两种构型中性分子O4,正一价分子O4+和负一价分子O4-的基态电子结构,并根据能量最低原则确定了各自的结构参数,从而得到了O4分子2种结构的基态总能量
中华民族为什么先天弱于逻辑思维
m24h
2年0个月前
回复于
科学技术学
内容:亚里士多德的种子 也是到了近代才绽放花朵 而在近代之前 西方一样普遍愚昧 原因都是古代生产力不足以承担逻辑和科学之花的绽放 其实就算现代 西方也一样有神权治国的地方 若是不顾时代局限地发展 则会严重影响社会稳定,其实就中西历史比较 应当承认 我们的古人是比西方的古人要幸福的 关键就在于大集权系统的稳定中国并不是什么“形象思维压过逻辑思维” 是人都会去思考 逻辑思维是人去想的 而人是受制于统治的 而统治并不认为逻辑思维不对
80M 波(3.5xxMHz)简单发射电路
jrcsh
13年3个月前
回复于
电子技术
内容:该机性能稳定,便于携带和维护,是全国青少年无线电测向锦标赛核准用机。
可否利用空速管联合开伞回收
三硝基二甲苯
10年5个月前
发表于
喷气推进
内容:当加速计的值(合力方向)减小到一定值时自动延长尾翼,增加稳定性,抗自旋。
关于竖直放置式火箭发动机试车台实际推力总冲测量精度影响的粗浅讨论
FROZEN巨擘
9年8个月前
发表于
喷气推进
内容:竖直放置式推力试车台,因为它的结构较为简单,稳定性好,使用方便等原因,应该是众多火箭发动机爱好者较为常用的推力试车方式。
提高单片机对模拟传感器(电压)采样精度
game00over
11年7个月前
发表于
仪器仪表
内容:由基准电压不稳定造成的测量误差实在是太大了。
改中兴ZXD2400为可调电源
m24h
3年1个月前
发表于
电子技术
内容:ESP32/S2 可以用Micropython快速开发 具备DAC和ADC 缺点是个头有点大 ZXD2400面板下面那个小窗口恐怕放不进太大的电路板ESP32C3 小巧 感觉RISC内核也比其他几个稳定,可以精简滤波电路 算法简单 但也需要I2S循环播放才能实现PDM模拟 高频也容易去除 算法复杂 也需要I2S循环播放来实现电压控制方面:设定和测量分离无关 实际输出大负载下表现出一定的调整率 优点是稳定可靠采用,PID等方式动态调整 使得电压输出始终跟随设定 但是复杂的算法有时候体现出过冲等问题 负载变化的时候可能不稳定电流控制方面:与原电路过载控制结合实现 算法方便 但原电路的过载控制类似打嗝方法 ,LDO接入原机15V辅电 实现方便 但是如果打开WIFI 近1A的电流给电阻和辅电负担太大从15V辅电通过小开关电源变到3.3V 缺点是如果使用PWM模拟DAC和使用片内ADC/DAC时 不够稳定的电源会给精度带来较大影响先小开关电源变换到
16级Marx发生器
小特斯拉圈圈
9年4个月前
发表于
高电压技术
内容:可乐瓶(会留下一些白色的痕迹) 因为第一级电阻在火花间隙较长时容易发生击穿,像这样 所以为了稳定 第一级电阻换成了4串2并 倒是不击穿了,样子好难看。。
【H3C小组】一、Arduino二级火箭分离开伞自动控制程序源码【原创】
game00over
12年6个月前
发表于
软件综合
内容:USB接口5V供电,通过继电器1控制航拍模块电源,上电后自动开启声控录像,由于此模式不
稳定。
STM8系列单片机用4线LCD1602驱动程序(完整源码)
金坷居士
8年8个月前
发表于
软件综合
内容:LCD1602等待忙那里宁可多等也不能少等,等少了根本不能用,如果觉得等待浪费效率的话,那就接上RW线做Busy检测吧,代码不贴了,因为懒没做另外在单片机上点之后也不要立刻就开始初始化屏幕,需要等电压稳定下再来以上程序完全原创
制作ZVS经验谈——哪些元件很关键?
kcltxinshou
13年1个月前
回复于
高电压技术
内容:但工作很不稳定,有时正常拉弧,有时极短,且始终是一个场管发热厉害。,二、现象 1.拉弧2cm左右;若使用30V交流引入,则拉弧更长;但MOS其中一个发热,另一个冰凉 ,且2脚波形不稳定(可惜这个没拍照)。
注意水龙头,别被冲洗仪器稀释溶液时被试剂喷了。
adj1202
12年11个月前
发表于
化学
内容:以后配置稀溶液时,用水龙头图个方便冲洗的,一定先开水龙头,水流稳定不异常后才可以使用。
MPCVD工艺技术多因素研究
流落到四川
5年3个月前
发表于
晶体养成所
内容:相较其他类型的谐振腔,圆柱形单模谐振腔具有微波场稳定度高、结构简单、易于加工等优势,成为广大研究工作者针对CVD金刚石膜进行基础研究的首选装置。 ,一般而言,具有高品质因素且能有效运用于金刚石膜沉积实验的MPCVD装置必须满足以下4个基本条件:(1)保证输入微波谐振腔的微波能达到最佳耦合状态,实现高稳定度微波等离子体的均匀激发;(2)保证所设计的石英介质窗口能有效地避免高功率条件下微波等离子体的刻蚀及污染,但不锈钢谐振式虽然具有可以长时间稳定生长单晶金刚石且生长速率较快等特点,但其装置通常使用单基片台结构,等离子体球中各个基团密度较小,基团强度较弱,金刚石生长的速率和生长质量均不能够达到理想状态。
KC901S日记--打造人人都能拥有的,真正的,矢量天线和阻抗分析仪
虎哥
10年0个月前
回复于
仪器仪表
内容:今天花了很长时间非常仔细的研究了幅度波动的问题,用频谱仪进行了时域分析,得到主要的坏消息是,在5K带宽下,滤波器的稳定时间应取800us为宜,也就是说本振调谐以后,至少要等800us才能进行幅相处理,史密斯图的实际等待时间只有
叫鬼佬一邊蹲著去 我做的DRSSTC槍
御坂美琴
15年1个月前
回复于
高电压技术
内容:欺负人~ 明明昨天才叫人家biribiri的 结果今天就把人家忘了 555~~~回楼下:我本体是某位大人在AIM扩散力场的表世界都市的不稳定思念体具现化的产物 我的一切都是那位大人赋予的再回楼下:少拿那個五行机关的核心意识体來跟我比,里因为主人的力量而被创生出来的不稳定思念体通过某位少女的身体具现化后的产物 [这就是为什么御坂美琴可以从LV1升到LV5]如果不是英国清教在二十五年前 因某些人的煽动想要结合超能力与魔术产生新的施术者,为什么超能力者的肉体承受不了魔法你想过么 那是因为肉体的强度达不到让神殿具现化的程度 因为 超能力与魔法融合会在容器里创造出神殿 能力越强 神殿对容器的要求就越高 而当LV5与天草式十字凄教的前女教皇Salvere000集中到一个足够稳定的容器里时
是不是高压包坏了捏
yuyue3106
12年5个月前
回复于
高电压技术
内容:的相位差,从而维持灯的二次启动电压,使灯能更稳定的工作。
数字开关鉴相算法在血氧仪的设想
m24h
2年5个月前
回复于
电子技术
内容:食指正好压在后面的传感器 但是现在发现一个问题食指会过于用力压在传感器和外壳上 影响了正常的脉搏血流 原始数据很清晰地反映了这一点 首先起伏变小 原理类似血压计 其次是刚开始测量 手指刚受压 需要很长时间血流和脉搏才进入稳定的状态早知道就用拨动开关接通电源
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