H********g
发帖数: 43926 | 1 http://en.wikipedia.org/wiki/Streak_camera
A streak camera is an instrument for measuring the variation in a pulse of
light's intensity with time. They are used to measure the pulse duration of
some ultrafast laser systems and for applications such as time-resolved
spectroscopy and LIDAR. |
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l******8
发帖数: 9475 | 2 我当年打球时(大四以前): BMI 18.8, Pulse 50
大五快毕业时: BMI 22.6, Pulse 50+. 毕业前半年, 天天在机房中泡着, 应该长了
不少肉. |
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z******9
发帖数: 31 | 3 Veterinary Applications:
• Orthopedic injury, non-union
• Refractory lesions of skin, tendon, ligament, bone & nerve
• Accelerate post-surgical recovery
• Spinal injury and paralysis
• Incontinence: urinary and fecal
• Neuropathy and deep tissue injury
• Diabetic ulcers, other complications
• Arthritis and joint injury
• Chronic pain & inflammation
• Adjunct to stem cell therapy
• Adjunct to acupun... 阅读全帖 |
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C*******g
发帖数: 9288 | 4 ☆─────────────────────────────────────☆
aihaha (爱哈哈) 于 (Fri Jan 15 14:37:03 2010, 美东) 提到:
下面是从新闻上摘下来的：
"Google has always been a company with a moral pulse, one that in its early
days attracted a certain sort of idealistic engineer who truly believed the
world could be made a better place by a responsible corporation that
efficiently spread information and technology around the world. Yet Google
is also one of America's largest and richest public companies, and obsessed
with growing even la... 阅读全帖 |
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c****t
发帖数: 19049 | 5 THE PACIFIC JOURNAL OF ADAM EWING
Thursday, 7th November—
Beyond the Indian hamlet, upon a forlorn strand, I happened on a trail of
recent footprints.
Through rotting kelp, sea cocoa-nuts & bamboo, the tracks led me to their
maker, a White man,
his trow-zers & Pea-jacket rolled up, sporting a kempt beard & an outsized
Beaver, shoveling
& sifting the cindery sand with a teaspoon so intently that he noticed me
only after I had hailed
him from ten yards away. Thus it was, I made the acquaintance of... 阅读全帖 |
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D*****r
发帖数: 6791 | 6 http://www.youtube.com/watch?v=XtfqoWS3z90
Bonfires dot the rolling hillsides
Figures dance around and around
To drums that pulse out echoes of darkness
Moving to the pagan sound.
Somewhere in a hidden memory
Images float before my eyes
Of fragrant nights of straw and of bonfires
Dancing 'til the next sunrise.
CHORUS:
I can see the lights in the distance
Trembling in the dark cloak of night
Candles and lanterns are dancing, dancing
A waltz on All...All Souls Night.
Figures of cornstalks bend in ... 阅读全帖 |
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l**********t
发帖数: 5754 | 7 chapter 4.3 Temptation And Failure, The Challenge To Faith
For us, then, the two greatest facts in history are these: that all our
sins are dealt with by the Blood, and that we ourselves are dealt with
by the Cross. But what now of the matter of temptation? What is to be
our attitude when, after we have seen and believed these facts, we
discover the old desires rising up again? Worse still, what if we fall
once more into known sin? What if we lose our temper, or worse? Is the
w... 阅读全帖 |
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l**********t
发帖数: 5754 | 8 chapter 4.3 Temptation And Failure, The Challenge To Faith
For us, then, the two greatest facts in history are these: that all our
sins are dealt with by the Blood, and that we ourselves are dealt with
by the Cross. But what now of the matter of temptation? What is to be
our attitude when, after we have seen and believed these facts, we
discover the old desires rising up again? Worse still, what if we fall
once more into known sin? What if we lose our temper, or worse? Is the
w... 阅读全帖 |
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w**u
发帖数: 311 | 9 我来试着回答一下Cpath 兄
六尘就是能被耳鼻眼味身意 觉知，观察 的所有信号。而六根就是觉察的物质基础。
前五识五根五尘相对简单，是因为适宜外界物理刺激（五尘），撞击适宜感受器（五根
），产生感受器细胞膜电位变化，神经递质释放，在下游神经产生pulse . 我认为这个
初步的pulse 包含了信息，就是前五识。前五识是对光能 （视觉），机械能（听觉，
张力觉），化学能（味觉，嗅觉），热能的初步解码。
之后产生的神经冲动，它本身既是前五识的表现，也是一种物理能量，电能。我称这种
电能刺激为意尘。意尘 撞击更高一级的中枢感受器，这个高一级的物质基础，就是意
根。意根先是感受有序还是无序，如果是有序，再感受是逻辑有序，还是情感有序。所
以意根就是中枢大脑中 像杏仁，边缘系统其他结构。意尘的特点是以神经电冲动为刺激
模式，所以既有可能来自于转换后的前五识，也有可能是记忆潜意识大海里，几个脱离
白色（white noise） 噪音背景的，浮上阈值的杂念。 |
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d**********u
发帖数: 4124 | 10 ☆─────────────────────────────────────☆
yuanfeiwo (原非我|梨园深) 于 (Sat Nov 15 15:51:26 2008) 提到:
从别处转载来的，可能统计并不完全
http://www.ncku1897.net/post/topic.aspx?tid=2763619
生物医学：
Cell. Vol 134, 279-290, 25 July 2008 (IF=29.887)
Physiol Rev 88: 1491–1545, 2008 (IF=29.6)
Nat Rev Neurosci. 2008 Aug;9(8):646-54. (IF=24.52)
Circulation. 2008, doi: 10.1161/CIRCULATIONAHA.107.761932 (IF=12.755)
Gastroenterology. 2008 Apr;134(4):998-1006. (IF=11.673)
Mol Psychiatry. 2008 Jan 8 [Epub ahead of print] (IF=10.9)... 阅读全帖 |
|
l**n
发帖数: 7272 | 11 版务整理一些有用的app方便大家。如果您知道有好的app，也请回复这个帖子。我们会定期更新。
表格：
http://cssanih.org/mediawiki/index.php?title=Apple#Q.EF.BC.9A.E
List：
PairShare : Leisure : Select music on your iPhone, iPad or iPod Touch and
stream it live with another iPhone, iPad or iPod Touch, using Bluetooth.
Waze : Navigation : When you download Waze, you not only get a free traffic & navigation app, but also become part of the local driving
SketchBook：Drawing： "This drop-dead gorgeous app for digital artists packs a rich feature set in... 阅读全帖 |
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E***e
发帖数: 3430 | 13 pptp和openvpn看上去都被公司封了，
不打算继续fight了，
在这傻逼公司应该也呆不了太久。
可是学校的Junos Pulse完全没问题。
Pulse到底是什么类型的VPN？ |
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a*******e
发帖数: 3021 | 14 crw-rw----+ 1 root audio 116, 5 Mar 13 14:36 controlC0
crw-rw----+ 1 root audio 116, 12 Mar 13 14:36 controlC1
crw-rw----+ 1 root audio 116, 11 Mar 13 14:36 hwC1D0
crw-rw----+ 1 root audio 116, 4 Mar 13 14:37 pcmC0D0c
crw-rw----+ 1 root audio 116, 3 Mar 13 14:37 pcmC0D0p
crw-rw----+ 1 root audio 116, 10 Mar 14 19:22 pcmC1D0c
crw-rw----+ 1 root audio 116, 9 Mar 16 15:40 pcmC1D0p
crw-rw----+ 1 root audio 116, 8 Mar 13 14:37 pcmC1D1c
crw-rw----+ 1 root audio 116, 7 Mar 13 14:37 pcmC1... 阅读全帖 |
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o**2
发帖数: 168 | 15 这两年来一直在埋头带娃和闭关修炼自家的庄稼把式，爬出来一看，技术都换代了。当
然，大家在这个版上挖的语言坑还是历久常新，呵呵。
Microservice Architecture据说挺火，我找了一篇Martin Fowler写的文章(
Martinfowler.com/articles/microservices.html)，看了觉得不错，大家终于想起来
这个方向了。
Lemina Computer是我自己搞的东西，目前算是告一段落，后续还有很多东西可以搞，
不少方向都在我脑子里，这里是我写的一篇介绍文章(Leminasoft.com/docs/lemina-
computer/)。
大家有时间的话，可以比较比较它们的异同。更重要的是，如果你觉得这个东西值得搞
下去，还请援一援手，当然不是要钱哈,是求关注、求加LinkedIn。因为我发现
LinkedIn的Pulse是一个比较适合推广技术的渠道，至少适合我的情况：我建了个车库
型Startup。我计划经常在LinkedIn Pulse发点介绍性的文章，需要大家点赞转发，写
评论就更好了。
这是我的(Linkedin.com/in/Le... 阅读全帖 |
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m*p
发帖数: 226 | 16 They did not say how long they pulse label the heart with BrdU. But, since
their data indicates the percentage
of BrdU positive cells is almost equal to Ki67 percentage, that means the
BrdU labeling time will be more than
24 hours. When you label an E14.5 hearts with Brdu for 24 hours, more than
half of the cardiomyoctyes will be
positive if you know how fast the embryonic cells proliferate in vivo,
however they only found about 20% cells
were positive.
Their Ki67 staining is not the right sta... 阅读全帖 |
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a******a
发帖数: 283 | 17 文献上查到的材料说我用的这个病毒株在细胞里的蛋白合成比其他的要少（但是他们用
的是pulse label然后跑胶显影得的结果）；我们用western blots的话，发现实际上感
染了这个病毒株的细胞里的病毒蛋白远远要比其他的多。现在问题是，需不需要重新做
其他组做过的pulse label的试验。我的意见是，我们有逻辑的数据分析（qPCR数据证
明该病毒株感染后细胞内的病毒dna也比其他的要多很多），所以没必要做那个试验，
但是老板的意见是一定要做这个试验。我认为是浪费时间。因为有其他的问题更需要回
答。
有经验的看看，这种情况有没有可能？就是学术讨论以下。谢谢。 |
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b*****d
发帖数: 271 | 18 【 以下文字转载自 NewYork 讨论区 】
发信人: borland (Borland|0300), 信区: NewYork
标 题: CCC New Year Party Dec 17,2013
发信站: BBS 未名空间站 (Tue Nov 19 20:15:58 2013, 美东)
CCC New Year Party- Luke Imperatore/Jean-Francois Collard "Strategies to
Grow Your Hedge Fund"
Tuesday, December 17, 2013
6:00 PM - 10:00 PM
http://cccnetworks.org/events_view.aspx?eventID=216
The CCC New Year Party will be a great event. Dinner including food and
drinks.
The guest speakers are Luke Imperatore and Jean-Francois Collard. The topic:
St... 阅读全帖 |
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y*****s
发帖数: 1047 | 19 现在仪器的dwell time可以很短，扫描频率很高
但是 QTof duty cycle很难高的了，因为即使对单个m/z也要扫描等于和低于它的离子,
不考虑这个,哪里可以找到pulse和inter pulse的比例？
trap的效率也可以很高，但是收集离子的时间和trap离子的时间 比例是多少
frequency |
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b*******g
发帖数: 1309 | 20 pulse的频率很高，20k Hz， 每个pulse的时间是0.05ms, inter pluse是包含在0.05ms
之内的
TOF 的pluse pusher不是问题的关键。
一个spectrum 是若干个pluse 累加的，完成一个spectrum过后需要的传输时间很长，
至少在2ms以上。 在传输data前，即使有离子进入detector 也不会被记录的。
甚至仪器在做MS/MS的时候，还有一个 “thinking time”，在50ms level per （MS1+
nMS2） cycle。这些都是造成离子不能被检测到时间。
Trap的accumulation 跟trap 可以在1-10ms完成,对于特别低浓度的可以trap 100ms以
上。 但是检测时间比较长，在50-100ms level，甚至更长。
子, |
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y*****s
发帖数: 1047 | 21 你的duty cycle是指scan time吗？
duty cycle不是一个时间，是ON和OFF时间的比例...
那么降低scan speed或者说增加pulse的累积次数是因为数据传输速度不够，所以累积
起来，等到上一个scan的数据传输完了再送到电脑记录
但是电脑位数有限，不能累加太多超过上限
所以仍然存在一部分数据不能被记录的现象
看来还硅工摩尔定律搞了几十年还是不给力...
你提到有一个电压可以在pulse OFF时留住离子，最后离子损失不是>99%而是多少呢? |
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a********e
发帖数: 547 | 22 我怀孕时吃的太多，导致高血糖。而且吃饭以后以后头轰轰响。响的频率似乎是心跳的
频率，轰。。轰。。。轰的
生完孩子后在产房里护士测我的血糖，好像还是高。但是哺乳期间的还是吃的挺多的。
今年年初停止哺乳我去查了一次血糖。早上空腹92。医生说在正常范围，但还是很高，
因为最高限是99。而且我量血糖前的晚上因为有点事几乎没睡着，血糖消耗应该比正常
的多。如果我那天晚上睡觉睡的好，血糖应该是比没睡好觉高还是低呢？
有一阵好像轰轰响的毛病好了些，最近又遇到点事让我大怒，也可是能是因为气的躺床
上几天没动，吃了躺着，导致血糖又高了，现在头又开始轰轰响。
我还有失眠的毛病。
我以前总认为自己可能只能活到45岁，现在看来还真有可能，我自己倒无所谓，虽然活
的短，但也无怨无悔，可惜我那幼儿。。。。
我的家庭医生也不知到轰轰响是为啥。她说是pulse， 可是我以为pulse 没这么响的。
可能中医有更好的解释。 |
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k******n
发帖数: 13 | 23 Have a pulse signal spectrum. The outline is like
(sin(pi*w*sin(theta)/lambda)/(pi*w*sin(theta)/lamda))^2. But under the
outline, there are a few pulse signal.
But don't know how to fit the envelope for it. Think the envelope function is
(sin(pi*w*sin(theta)/lambda)/(pi*w*sin(theta)/lamda))^2. But what the
mathematic relationship between the signal and the envelope? I can find the
mathtools like mathcad, matlab and mathematica. So if there is any code of
them, it will be more helpful.
Thanks. |
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f***t
发帖数: 105 | 24 Well, FROG stands for freqency-resolved optical gating.
For my knowleadge, one traditional way is use
autocorrelation
(use second hormonic crystal to get the autocorrelation
output)
in time domain to measure the pulse width. But one
disadvantage
that you need to change the delay little by little, then
collect
all the point to get the autocorrelation curve, then use it
to
get the pulse width.
For FROG, it also use something like that, but the
difference the
delay comes from the certain the spati |
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s***l
发帖数: 2236 | 25 I noticed that. and that's why I suspect that there's only sinusoidal
output signal. In that case, what's the use to talk about all kinds
of signal? The bottom line, sinusoidal signal should be available as
long as it is some sort of signal source, no matter sg, fg. but pulse
generator is a different story. There are such applications that want
really fast pulse signal, say in the picosecond range. The duty cycle
is much smaller than one, meaning the repetition rate is much lower
compared to the |
|
m********t
发帖数: 9426 | 26 【 以下文字转载自 Overseas 讨论区 】
发信人: pulse (pulse), 信区: Overseas
标 题: 出国vs 国内工作？
发信站: BBS 未名空间站 (Wed Mar 26 11:58:40 2008)
个人情况，女，家在北京，国内名校ee master, 老公在美国读ee。
现拿到：
老公学校ee的offer，60左右的东海岸学校，signal processing方向。
北京一所研究院的offer，估计（工资6k/m+年终奖）=10w/y，单位不是特别辛苦，希望
我进去干一段时间然后在研究院读在职博士（里面博士比较多，读了博士才好往上发展
）。
劳工属于读不读phd都可，倾向于master工作，但是一定是要回国的，我要国内工作的
话，他马上就准备master回国找工作。
我要是过去读书，他觉得学校不是特别好（signal processing也不是很好找工作？）
，我还得再读4，5年，划不来。
btw，我去过美国看劳工，可能祖国这几年发展很快，不觉得比美国差：）。
4/15 要到了。。还没给学校答复呢，问问各位过来人，offer如何取舍。。。 |
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x*u
发帖数: 25 | 27 都是有关oscilloscope 应用的问题：
1, How to measure the frequency of the RTC crystal
2, How to probe an SPI ROM in action and determine how fast data can be
transferred
3, Determine how many times reset triggers when you power up the computer.
Also determine the length of time between the first and second reset pulses
as well as the duration of the second reset pulse.
俺是偏CS的，没怎么用过oscilloscope
有没有大虾帮忙回答一下啊
多谢了 |
|
c******k
发帖数: 1140 | 28 本人不是学电子的，近期要买示波器测 ultra short pulse.
center wavelength: 1550nm
Repetition rate: 40MHz
Pulse width: 100 Fs
请牛人解释一下什么样的示波器能满足我的要求？ 另外示波器面板上的4GHz和20Gs/S
是什么意思？多谢 |
|
A*u
发帖数: 111 | 29 shape of the pulse depends on optical spectrum and the phases of all the
components
测一个optical spectrum难道还能得到不同optical frequency component的相位的信
息？
那测一个optical spectrum就可以知道shape of the optical pulse了？ |
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z*****n
发帖数: 7639 | 30 These are two different concepts.
The wavelength components combination is not the same as spectrum. Just thin
king of the pulse sent by the Tx, it
also contains all the wavelengths, but the pulse shape
is more rectangular. |
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h*w
发帖数: 134 | 31 1. You should state what kin d of pulses you are using? fs, ps or ns
2. what is the peak power? so we can see if there are nonlinear effects.
3. Assuming there are no nonlinear effects, for a typical fiber either
1300nm or 1500nm or visible, there are no problems for conducting 30 nm
light source.
4. Never confuse with electrical signal transmission.
5. If there are nonlinear effects and assuming your fiber and the connection
are damn good. Yes, pulse spectrum can be narrowed due to self phase
m |
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t*****e
发帖数: 666 | 32 assign #10 out = in1 & in2
if input pulse width is less than the specified assignment delay ( 10 in
this example）， then this pulse is not propagated to the output
比如在时间0， in1和in2都是0，在时间10, out变成1
在时间20， in1 0->1 , 但是在 时间25 in1 1->0. 但是因为脉冲宽度是5，小于10，
所以输出不会变化。
这个对应电路的什么特性？ 有点没搞清楚 |
|
e***i
发帖数: 58 | 33 你可能需要一个高频的信号发生器和示波器吧？pulse generator, oscilloscope.
curve tracer 一般有pulse的源，但都是微秒的，好像是3 micron sec?或许
300 ns?我不记得了。不然curve tracer应该是便宜又方便。
因为SiC JFET都是作为高频高压开关，不知道功率有什么要求。 |
|
s*******p
发帖数: 156 | 34 for 1:
it is just a logic design. for launch on capture, you need to design the
clock generator as: when scan enable =0 start check test clock pins; after
receiving enough clock pulses (normally 2), sending out 2 internal clock
pulses at PLL speed.
for 2:
you have to read the tool document. it explains how to create spf procs for
transition faults
access,
shift
from |
|
g******u
发帖数: 3060 | 35 我关心的问题是
(1）ic(t), ic(t)怎么就能变成peak current的值 - 还就是control的nature
try to find out later.
(2) comparator - 一般的comparator,
v(+) - (v-)> 0 , 输出1
v(+) - (v-)< 0 ， 输出0
这里看来要求的是ic(t) - is(t) = 0, comparator输出change status.
It senses input current, if zero, means switch open, able to turn on
switch if necessary. Then if Vref>Vout, comparator provides grounded output,
when the SR latch sees a pulse from clock, it turns on the switch as the
load drops.
Quite simple.
(3) SR -latch这块。 s接pulse, r接 |
|
ET
发帖数: 10701 | 36 最有一个问题，pulse的意义应该不只是define frequency的吧？
这个pulse有啥讲究呢？
output, |
|
M*T
发帖数: 25 | 37 现在有个实验,输出结果估计是10-100uV 的电压信号.信号是pulsed, pulse duration
可调, 1us~1ms. 频率1kHz 左右.
请问怎样能比较准确的测量这样的信号? 貌似10uV的信号, 我的lock-in amplifier 也
很难看到了?
非常感谢! |
|
f*******t
发帖数: 49 | 38 在看一个项目的源码，原来设计中，用2个input capture中断来读取传感器的pulse
input，通过计算这个PULSE的频率，来得出工作的速度。
现在看源程序，这个频率最快，可以达到1000HZ，就是1ms就要中断一次。
同时程序中还有18个task， 其中的9个，是10ms 调度一次。其他的大概5个50ms, 4个
100ms. 任务和底下的中断的优先级差不多，一个最高级，其他的任务分2个优先级，差
不多一半2，一半3.
同时程序中还有8个其他的中断,分别是AD和Timer中断。中断分3个优先级，一个1级，
最高，剩下大概4个2，4个3.
还有个看门狗中断， 最长52ms计时， 原设计是10ms 喂狗一次。
RTOS是基于优先级的抢占式的实时系统。
有没有高手帮着分析下，这样的时间安排，是不是不太好。
我是被这些中断，TASK, WDT，给弄得分析不出来这个时间关系会否冲突了。 |
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a****z
发帖数: 1 | 39 I have a series of TTL pulses, which is about 10^4 counts/sec. and I want a
counter to count these pulses. I hope the counter will give me the counts over
all experiment time (about 100 sec) and the time-step is about 10^-3 second.
Do you know any company produce this kind of counter?
Thanks ... |
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w*****f
发帖数: 61 | 40 【 以下文字转载自 EE 讨论区 】
发信人: websurf (天天冲浪), 信区: EE
标 题: Matlab Simulink 一问
发信站: BBS 未名空间站 (Thu Oct 27 20:25:23 2005)
xdjm们，我花了一下午也没搞出这个看似巨简单的问题。 考，真没有成就感。。。。
如果我要改变pulse input的pulse width in real time, 如何实现？
谢谢了 |
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w*****f
发帖数: 61 | 41 【 以下文字转载自 Engineering 讨论区 】
发信人: websurf (天天冲浪), 信区: Engineering
标 题: Matlab Simulink 一问
发信站: BBS 未名空间站 (Thu Oct 27 23:09:47 2005), 站内
发信人: websurf (天天冲浪), 信区: EE
标 题: Matlab Simulink 一问
发信站: BBS 未名空间站 (Thu Oct 27 20:25:23 2005)
xdjm们，我花了一下午也没搞出这个看似巨简单的问题。 考，真没有成就感。。。。
如果我要改变pulse input的pulse width in real time, 如何实现？
谢谢了 |
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f*******t
发帖数: 30 | 42 Job description: Laser Application Engineer/Scientist
Candidates will be responsible for investigating the feasibility of using
lasers for laser material processing and should understand laser-material
interactions and be capable of optimizing processing parameters (including
laser wavelength, power, pulse energy, pulse width, etc). Develop new laser
processes for different industries such as semiconductor, electronics, and
medical. Improve our understanding of laser/material interaction throug |
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L********g
发帖数: 17 | 43 Form 4 section 1
a 10 month old infant is brought to the emergency department because of
labored breathing for 1 hour. she has had cough, coryza, and fever for 18
hours. her temperature is 39 C, pulse is 120/min, respirations are 54/min,
and blood pressure is 82/60 mmHg. Pulse oximetry shows an oxygen saturation
of 92%. bilateral wheezes and basilar crackles are heard. select the most
likely pathophysiology of the respiratory problem
a) allergen induced bronchospasm
b) barotrauma related alveola |
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