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发表于
科学技术学
内容:殊不知,单从人口角度讲,美国的强大是靠人口的快速增长和人口转变之后的稳定生育水平(如今美国人口的生育水平高于中国),而不是抑制人口增长和发展。,但在判定今后人口形势时又指出我国人口“低生育水平反弹势能大”,要“千方百计”稳定低生育率。,在越来越多的人为追求个人幸福生活而选择少生或放弃生育的人口形势下,我们应该向那些承受巨大“压力”(政策压力、养育成本压力等)生育二孩特别是三孩以及上的人们致敬,因为是他们在为中国的未来注入活力,是他们在为祖国的未来做出奉献,是他们在为中国社会的多样性和稳定性做出贡献,开放我国的生育政策,不仅天塌不下来,而且因为中国人口的稳定健康发展,还将撑起世界的未来!
微软大馒头——Sculpt人体工学鼠标 拆解维修
mould
9年8个月前
发表于
电子技术
内容:而且Sculpt的表现也没让我失望,两年多来一直在稳定的运行 从不关机的工作却只换过一次电池,而且同步很快 不像有些无线鼠标完全没法用来打游戏 不管是类dota 射击游戏 还是3D max .Photoshop,主控型号是NRF 0 24LE 1H 不知道这是个啥芯片 线路板上有许多空焊,应该是给同系列的其他产品准备的 电源接入的弹簧片是镀镍的 和电路板间还衬了一块铜片 应该是起屏蔽作用 可见扎实的做工是稳定运行的保障
GaN功率器件应运而生,将开创电源应用新纪元
拔刀斋
15年10个月前
发表于
电子技术
内容:新材料应用的初期所遭遇的瓶颈主要是制造成本和质量稳定性。,IR也确信这种新材料能够满足硅器件已经树立起来的行业质量规范,并可实现在工作10年后仍保持性能
稳定。
航天局的日常/玉兔5火箭讨论
拔刀斋
11年2个月前
回复于
喷气推进
内容:固体火箭起飞加速度较大,尾翼气动稳定效果好。,但刚离开发射架时速度很慢没有气动稳定作用,必须使用控制系统(倒立摆原理)保持飞行姿态。
转发:我们能否从以英美为师,转向与德日同行?
虎哥
5年2个月前
发表于
经济学
内容:比如,“在德国,百姓比较崇尚社会秩序,愿意接受各种各样的社会经济政治的制度安排,维系社会长期的和谐和稳定”,“在德国,法律是由国家制定的,不像英国和美国,法律条文是由各个分散的法院通过成功的判案演变而来的,这种无形的制度设计保证了相关产业链中的企业经营的稳定性和可预期性,有利于保持长期交易,降低了交易成本,结果当然是一荣俱荣,一损俱损。,以前是金字塔形组织,通过既定流程,由事业部下达命令,现在已经变成了具有通融性的团队运营方式,追求长期稳定的利益(《战后日本经济的成败启示》,石原享一,2019)。,不让权力、财富、声誉同时集中至某一极,正是日式资本主义获得稳定和发展的关键所在。”
林毓生:五四以后科学主义在中国的兴起
大仙
16年5个月前
发表于
科学技术学
内容:中国传统秩序非常稳定,也持续了很长的时间,虽然也有朝代的更迭,但政治思想文化包括社会秩序都非常稳定,尤其是社会结构非常
稳定。
层流质量流量计在氢燃料电池汽车检测行业的应用
小德喵喵
3年1个月前
发表于
仪器仪表
严肃内容: 专业科普
内容:这项测试要求流量控制稳定,响应时间快,而层流质量流量控制器的高重复性以及500ms以内的响应时间能够很好满足测试的需要。
某些天线的问题[3分]
全能杀手
17年6个月前
回复于
电子技术
内容:这只是电子产品设计的一部分.一个高可靠性电子产品的设计需要考虑很多东西,跨学科特别明显.而且需要具体的数据,试验结果.这些数据很难找到现成的.我只在某些书上找到了部分元件的故障率.试管天线关键是高介电常数低损耗且稳定
昨天做了个超恶心的lm317功放,求指导。
mass_lynnxy
14年4个月前
回复于
电子技术
内容:晶体管VT1作为电压放大,因稳压集成电路IC1的输入阻抗高,故其工作电流只需0.6mA就足够了,R1,C3为电源退耦,C4用于防止寄生振荡,R3、R4分压给VT1提供偏置及交直流反馈,以改善线性及直流稳定性
求助!8V降到6V
符灵兮
15年5个月前
回复于
电子技术
内容:请问需要什么样的零件才能把电压稳定在6V,还有就是这个零件不能费电,小弟昨天去买了几个5W的电阻串连,用10W的灯泡测试,想不到比较以前8V25W的灯亮的时间还少!
回 16楼(hanbreen) 的帖子
black
12年4个月前
回复于
电子技术
内容:功率太小随之而来的就是功率管开通时间的加长 带来的后果就是开关损耗的增加所以你后面的话 并不能辅证你的言论你说到的电磁兼容性问题 可以通过各种屏蔽手段达到检验要求 而判定电源好坏最本质的还是转换效率 输出稳定度
受论坛smith影响做sdrplay,我也自己画了一版完整版的sdrplay 1,公开原理图和PCB图
虎哥
4年10个月前
回复于
无线电
内容:4、考虑到SSB接收对频率稳定度要求高,应使用温补晶体。
设计了一个双键双稳态电路(简单可靠)及其应用
坚持and突破
12年7个月前
发表于
电子技术
内容:工作可靠
稳定。
5 000 W高压大功率电源的设计
大仙
16年0个月前
发表于
高电压技术
内容:为了满足行波管对高压电源的功率、纹波、稳定性等指标的要求,在设计中采用了开关电源设计技术。
IGBT驱动线圈过程中。。。经验小结
vcasm
11年6个月前
发表于
电磁炮
内容:板子上弄了一个蜂鸣器,模拟单反的延时快门效果,效果挺不错的 刚刚一次测试,又是10个IGBT,附带几个驱动芯片也不稳定一起换了,开始换25N120测试
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:直流稳压电源直流稳压电源是常用的电子设备,它能保证在电网电压波动或负载发生变化时,输出稳定的电压。
大家帮帮忙!谢啦!
slof
14年10个月前
回复于
电子技术
内容:当然这个电源也有优点:1-60V范围很宽,很少开关电源能这么宽范围稳定工作,带负载变化能力很强,比如在12V输出带50A负荷,突然把负荷去掉,电压不便,不会突然增高,很多开关电源做不到这点。
紧急求助:发电机带动UPS问题
wenyue
16年5个月前
回复于
电子技术
内容:楼主的第三个问题,个人认为有3个办法:1、使用650W发电机+500W后备式UPS接两台PC及台灯;这个办法需要测试发电机频率稳定的范围,在UPS的允许范围内才行。
简讯:玉兔三号试验火箭发射失败
ehco
13年1个月前
回复于
喷气推进
内容:对于拔刀所说的即便是紧配合,近似为裂缝的理论不敢苟同因为环缝的外圈并没有气体通路,不能提供稳定的流通通道那么只有极少量的高温燃气倾入接缝,如果气体的热容量不足以让接缝两侧的药柱升温到燃点以上接缝是不会起火的因此如果忽略了接缝处空心隔环的话
旧的不炸新的不来第二季
xj198398xujing
11年11个月前
回复于
喷气推进
内容:楼主自重啊不过RAP也不是洪水猛兽 只要工艺控制得当其性能以及材料、价格方面还是有可以圈点的地方前提是必须要搞好工艺控制 真空浇注工艺就以往的经验来看除了设计不当可能导致的过压外在发动机工况下均能稳定燃烧
电磁武器零件分析
1211
17年0个月前
回复于
电磁炮
内容:还有很多问题要解决,包括自旋稳定在内,大家加油。
火箭发动机试车
15241611943
2年1个月前
发表于
喷气推进
动手实践: 实验报导
内容:目前正在学习……在经过n次实验之后(阿婆主之前也造过很多燃料)就有了以下的试车视频:可以看出,燃烧前期不稳定,燃烧时间过长,燃料采用了百分之65的硝酸钾以及34%山梨糖醇,以及1%的氧化铜,但燃速依然很慢
星云科技N-2.1A二级火箭发射(多图预警))
XYSC
1年10个月前
发表于
喷气推进
内容:3.疑似气动外形有问题,重心过低,大幅度降低火箭稳定性这次发射行动虽然惨败,但也为我们下一步工作奠定了方向,飞天是人类长久以来的梦想,航模火箭的研发绝不应视同儿戏,更不应操之过急,每个细节都必须反复斟酌
ASR-TAAT第一代模块化航电系统项目资金申请
bh,王者归来
11年8个月前
发表于
科创基金
内容:星云“航电系统规格为90mm,可以兼容箭体内径90mm以上的无控气动稳定的业余/专业火箭。”
STC-AD转换程序
jrcsh
13年7个月前
发表于
电子技术
内容:nop_(); ADC_CONTR |= 0x80; //启动 A/D 电源 delayt(23); //使输入电压达到稳定
AP基小型可回收火箭
zsjzsj
2个月19天前
发表于
喷气推进
科创基金
内容:使用物理方法开伞,此结构稳定可靠,弹出伞包的成功率极大,大大提高了降落伞的开伞成功率.
求助:PVC在超音速状态会不会被阻力撕裂?
bh,王者归来
8年8个月前
回复于
喷气推进
内容:当然,如果火箭是稳定的,对姿态失稳有纠偏作用,故攻角有持续趋于0的趋势,在设计火箭的时候要认真考量重心和压心。
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