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电子技术
内容:车名:霸天虎特色:采用一个饭盒做的扣盒,用橡皮筋作为单项门缺点:不能计数,稳定性差。
LED照明系统设计指南完全版
mass_lynnxy
16年4个月前
发表于
电子技术
内容:现在的照明应用LED,具有普通照明所需的亮度、效率、使用寿命、色温以及白点稳定性。
线圈炮弹丸位置测量的一些方法
flyjack
9年8个月前
发表于
电磁炮
内容:开环方式入门简单,但要达到高效率、高稳定性,需要精良的制作、精心选择一致性好的元件、经过精确加工的弹丸、准确的安装等,实际上要求很高。,在这个领域,需要一些像勃朗宁、柯尔特一样的大师,用简单的结构得到稳定的效果,或者需要像米尼弹这样的革命性发明,通过结构的变化实现自稳定的运行,这样我们就不需要研究这些复杂的控制方法了。
我计划做一个线圈炮有些东西弄不明白,求科普,求改进
迪纳米斯
8年10个月前
回复于
电磁炮
内容:行波加速可以得到更稳定的出口动能,更高的功率密度等等优势,不过也有着更高的设计难度。
关于USA的土星5号一级火箭的疑问。
拔刀斋
13年9个月前
回复于
喷气推进
内容:燃料先流经夹套后喷入燃烧室,夹套内的压力高于燃烧室内的压力液体发动机燃烧室内壁都有气膜冷却(否则早烧穿了),有的靠小孔,有的靠燃料喷头侧面贴壁喷射(边界层冷却)燃烧不稳定性、高频振荡燃烧会破坏气膜使壁面直接暴露而迅速过热烧穿
液体火箭发动机
拔刀斋
14年1个月前
回复于
喷气推进
内容:喷注器现在流行用针式喷注器pintle injector,同轴喷射的液膜相撞雾化,燃烧稳定可靠而且自带一部分液膜冷却燃烧室壁的效果。
简单讲一下固体火箭发动机的点火
虎哥
8年6个月前
回复于
喷气推进
内容:根据燃料的点火特性不同,需要仔细的设计点火发动机的燃烧时间、排气量和燃烧过程,使整个大发动机压力稳定、平滑。
要做液体发动机了,寻找一种雾化器
vol2088
15年5个月前
回复于
喷气推进
内容:而且因为有设备已经可以批量生产70%的H2O2确实可以跟一大部分有机物接触后燃烧,我没试过,也不敢试,因为我曾经把30%的H2O2和无水乙醇1:1混合后加了点二氧化锰,结果点着的小纸片靠近后发生了爆燃,随后液体不稳定的脉冲式燃烧
玫瑰精油的精炼提取
科学狂人1996
11年4个月前
发表于
化学
内容:玫瑰精油的化学性质稳定,难溶于水,易溶于有机溶剂,能随同水一齐蒸馏。
基于LM2576的高可靠MCU电源设计
mass_lynnxy
18年6个月前
发表于
电子技术
内容:基于LM2576的高可靠MCU电源设计 本文关键字:稳压器开关电源 嵌入式控制系统的MCU一般都需要一个稳定的工作电压才能可靠工作。,加之工作在高粉尘等恶劣环境下往往将嵌入式工业控制系统置于密闭容器内的聚集也加剧了MCU的恶劣工况,从而使嵌入式控制系统的稳定性能变得更差。,LM2576系列开关稳压集成电路是线性三端稳压器件(如78xx系列端稳压集成电路)的替代品,它具有可靠的工作性能、较高的工作效率和较强的输出电流驱动能力,从而为MCU的稳定、可靠工作提供了强有力的保证。,将输出电压分压电阻网络的输出同内部基准稳压值1.23V进行比较,若电压有偏差,则可用放大器控制内部振荡器的输出占空比,从而使输出电压保持
稳定。
KC新产品即将问世:400MHz—3GHz宽带手持天线
虎哥
11年7个月前
发表于
仪器仪表
内容:额定增益:5dBiR100在标称频率范围内增益基本稳定,围绕5dBi上下波动。
暑假最后几天做的pllsstc
无敌把妹手
9年4个月前
发表于
高电压技术
内容:一直想做个可以稳定工作的桌面级sstc,可惜在驱动上走了不少弯路。
简谈液机点火序列
lyhhjahj
2年9个月前
发表于
喷气推进
内容:稳定性也不错,唯一的问题就是对小火箭不太友好,而且不能再次点燃。,还有一种就是论坛有用过的电弧加热法,这种方法简单但是对发动机的内径等要求极高,且稳定性无法与上述几种比较。
国外牛人自制网分校准件
zx-16533
7年3个月前
回复于
仪器仪表
内容:引用 happyab:引用 bg4tfw:引用 happyab:个人看法:不要用这种电阻改用高稳定度金属膜,例外器件必须抽真空,减少寄生电容!
KC908频谱仪软件缺陷/功能意见征集(BUG报告帖)
Kana
3年1个月前
回复于
仪器仪表
内容:型号:KC908U正式版,软件版本3.0.2触发条件:环境温度22℃,正常被动散热条件下,长时间开机运行(约40分钟),直至内部温度达到一定程度后(如CPU组件温度高于58℃,详见下面的截图),问题稳定复现
nanoVNA矢量网络分析仪的原理浅析
该用户不需要名字
4年7个月前
发表于
仪器仪表
内容:估计是通过STM32的内置温度传感器和DAC来进行温度补偿,从而达到更好的温度稳定性。,所以这么多的倍频下,时钟的稳定性还是有一定的影响的。
无机硫氰酸盐手记-非金属篇
gkaf2007
23时5分前
回复于
化学
内容:3PdSCN=As(SCN)₃+3PdBr 可能在水中会水解为三氧化二砷与硫氰酸CS₁ 一硫氰酸硒 可以用一氯化硒与硫氰酸汞反应来制备 SeCl₂+Hg(SCN)₂=Se₂(SCN)₂+HgCl₂ 不稳定,在无水情况下他可以在278K以下黑暗中稳定几周,加热到356~358K分解,在室温下与水,稀盐酸,稀氢氧化钠溶液,低级醇和吡啶作用而被分解,水解产物主要是硒,亚硒酸和硫氰酸根,二硫氰酸硒既具有氧化性又具有还原性
回 4楼(hx) 的帖子
玄明
12年1个月前
回复于
极客DIY
内容:于此相对应,结构强度或稳定性的问题便也不复存在了。
除了骂人抓人,还能干什么?——看南京放射源丢失事故
77na77na
10年8个月前
回复于
科学技术学
内容:是没有切实的设备寿命安全系数的评估,国产产品大多数都是出厂发个合格证完事儿,没有考虑后期疲劳寿命问题,就好比飞机或者电梯,都有金属疲劳寿命以及安全稳定性的测试以及使用周期强制更换限制。
恒流电子负载仪的制作(科创基金赞助 已更新)
BG5JFV
3年4个月前
发表于
电子技术
科创基金
内容:满功率测试一个小时之后,散热器上的温度逐渐稳定,在88至85摄氏度左右(室温32摄氏度),电流向上飘了103mA(估计是因为0.1欧姆电阻受热导致阻值变化而引起的)这里有待改进,要给电阻加一个补偿。
未来需要什么样的能源
大仙
16年5个月前
发表于
电气电工
内容:尽管人类利用能源已经有漫长的历史,能源技术的发展也取得了长足的进步,但目前人类的能源消费结构远远没有达到可持续发展的要求,且不说世界上有1/3的人口根本没有电力供应,1/3人口电力供应非常不稳定,就是在能源供应非常充足的地区
比快排还快的排序
ltc
14年1个月前
发表于
软件综合
内容:这种排序叫倍增排序,用于对正整数排序,负整数的话可以先都加上一个大的正数再用这种排序,它是基于寻址来排序的,不像快排是基于比较的,倍增排序的速度比快速排序快,是稳定的,不会退化到O(n^2),其时间复杂度为
【当下的未来】漫谈GPT4潜在的生产力与教育价值
汉斯喵喵
9个月10天前
回复于
软件综合
内容:笔者现在的硕士学位攻读的是农业经济学方向, 在研一的一些农学通识课的小测, 以及日常的学习中, GPT4也可以稳定做到9成的正确率, 少数出错也大多是掉进了多选的迷惑项里.
无线电测量计算懒虫公式
虎哥
5年2个月前
发表于
仪器仪表
内容:因此,让接收机极为稳定,能发现万分之几甚至更小的幅度波动,是非常重要的。,用这种办法会带来一个问题,那就是底噪总的来说是白噪音,会有随机波动,必须长期平均(或其它数学手段)才能得到一个稳定的值。,这就要求接收机的长期稳定性足够好,不能自己波动起来,而且是噪音稳定,不是大信号示数
稳定。
,通常的接收机(比如用于无线电监测的),经过简单恒温处理,大约能做到0.1dB的长期稳定度,相当于能够找回16dB的观测灵敏度,让天线口径缩小6倍。
中国人造金刚石行业发展现状-2018年国内人造金刚石产销量及进出口数据
流落到四川
5年3个月前
发表于
晶体养成所
内容:近年来金刚石行业产品结构有所调整,产量稳定在140-160亿克拉左右,2017年行业景气度显著回升,量、价均实现提升。
2012,太阳磁场会造成灾难吗?
猎鹰
13年3个月前
发表于
地理与地质
内容:在我们看来,太阳黑子是稳定的,因为它的变化非常小,但实际上太阳黑子是太阳表面的强磁场区域,同时它是不断变化的,我们也把太阳黑子叫磁活动现象。
北京零壹空间液体姿控发动机组试车成功
太空来电
6年10个月前
发表于
喷气推进
内容:零壹液体姿控发动机整机试车视频试车结果表明推力室稳态和脉冲工作性能稳定、系统参数调整计算正确,验证了姿控动力系统设计方案的合理性和正确性。
MTC-1迷你特斯拉线圈测评
ry7740kptv
7年5个月前
发表于
高电压技术
内容:为了测试稳定性,遂进行了多次通断电,每次均能顺利出电弧,说明此电路的可靠性还是很好的!
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