t****g 发帖数: 35582 | 1 买了一套EVGA的那个rectified X58主板:) |
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s*****t 发帖数: 107 | 2 家门口有microcenter,元旦的时候买了i7 950 CPU。
然后按照Tonganlhy大虾的建议买了这个主板EVC的combo,但是refirbish的,只包90天
。"(newegg有个rectified的主板,史上最低价了,呵呵。) "
又从tigerdirect买了GTS450显卡,装好机器之后发现显卡没有输出信号。请大虾看看
是不是主板除了问题还是显卡出了问题?
今天 |
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发帖数: 1 | 3 Silicon Carbide: Smaller, Faster, Tougher
Meet the material that will supplant silicon in hybrid cars and the electric
grid
Illustration: Anatomy Blue
Some technological revolutions are flashy, and some are almost invisible. We
’re quite familiar with the flashy ones; they’ve given us powerful
computers we can hold in the palms of our hands, devices that can pinpoint
our locations by way of orbiting satellites, and the ability to bank and
shop without leaving our homes.
But none of these innovat... 阅读全帖 |
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发帖数: 1 | 4 What Happened To GaN And SiC?
Early predictions were overly optimistic, but these technologies are
starting to make inroads.
About five years ago, some chipmakers claimed that traditional silicon-based
power MOSFETs had hit the wall, prompting the need for a new power
transistor technology.
At the time, some thought that two wide-bandgap technologies—gallium
nitride (GaN) on silicon and silicon carbide (SiC) MOSFETs—would displace
the ubiquitous power MOSFET. In addition, GaN and SiC were suppos... 阅读全帖 |
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z****e 发帖数: 54598 | 5 无意中看到的
Date
June 20, 2013 - 10:52AM
14 reading nowComments 1 Read laterSee more stories on:
Central Intelligence Agency IBM Government Accountability Office Amazon
Pin Itsubmit to redditEmail articlePrintReprints & permissions
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The CIA chose Amazon's cloud over IBM's. Photo: Karl Hilzinger
WASHINGTON: The CIA selected Amazon over IBM to build a cloud computing
service... 阅读全帖 |
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f********x 发帖数: 99 | 6 Batch is a special case of streaming
Posted on September 15, 2015 by Kostas Tzoumas
In recent blog posts, we introduced what we deem as requirements for systems
to classify as stream processors, and followed up with a detailed
comparison of current approaches to data streaming, including extensive
experiments comparing Apache Flink and Apache Storm.
We are not the only ones to make the point that streaming systems are
reaching a point of maturity which makes older batch systems and
architectures... 阅读全帖 |
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T*******n 发帖数: 493 | 7 I've let my TUG membership lapse. Shame on me!
http://www.tug.org/join.html
Gonna give Robin a call to rectify this. She is such a super nice lady.
What would TUG do without her? |
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g********0 发帖数: 6201 | 8 Federal Grant Bar for Neurologist
02/29/2012 David Pittman
A former SUNY neurology department chair has been found guilty of
fabricating data in two published papers, four grants applications, and a
submitted manuscript.
A former State University of New York (SUNY) neurobiology department chair
has been banned from conducting federally funded research for a year and
will have his work supervised for another two years. The ban is the result
of an investigation that found he falsified data in two ... 阅读全帖 |
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f*****0 发帖数: 489 | 9 they are typically switching regulators: rectifying ac into dc and then
lowered it to the desired voltage, in order to reduce weight/size and
improve efficiency.
they are typically isolated so use the fly-back topology. |
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g*****g 发帖数: 3623 | 10 what?
we are making 7.5Kw rectifier for telecom..still bad shape
if semi is bad..then our power supply manufacture would be worse/sigh
I always think IC/Semi are so good.. |
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b*******2 发帖数: 2121 | 11 实验室的pulse 不够强, 现在需要一个比较高功率的pulse
voltage ~100V
current ~2A
pulse width ~10ms or higher
duty cycle ~20% or higher
不知道用传统的rectifier 和直接用AC,能实现否? |
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g******u 发帖数: 3060 | 12 you need other factors, such as power factor, topology, etc.
What do you mean by "programmable"?
If you don't have much experience on transformers, you can rectify 24VAC and
filter it then feed it to a DCDC, then it's super tiny and simple. Only if
your requirement on power factor is low. |
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gr 发帖数: 2958 | 13 嗯,好像是这么回事,开始跟symage mm说的那篇文章也这个结论。
Optimal Design of a Compact 99.3% Efficient Single-Phase PFC Rectifier
虽然人效率99%了,还是diode的问题最大。
又不能不用diode,高压mosfet同步整流效率也不会高。
上次我设计一个200W的整到600V母线的也是diode占不少一部分。
可以让他们试试SiC,可能能强点,如果成本还可以再提高一点的话。 |
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t*1 发帖数: 124 | 14 我指variable input是:输入电压是变化(3 phase, 80~300V),frequency vary(
10 to 100hz), 经rectifier后, what kind of chip can handle that?power
rating:》1KW。
谢谢。 |
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g****t 发帖数: 31659 | 15 去walmart买个电磁炉,拆开研究下?
我印象里和你给的数据差不多.
我指variable input是:输入电压是变化(3 phase, 80~300V),frequency vary(
10 to 100hz), 经rectifier后, what kind of chip can handle that?power
rating:》1KW。
谢谢。 |
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w*****w 发帖数: 104 | 16 我说的这个power是,low power, or ultra low power。 里面代表的block就是boost
/buck dcdc, power rectifier, voltage doubler,swtich capacitor,charge
pump,等等
综合起系统来就是 power management。
具体可以参考UW 这个文章作为例子:
A 20 mV Input Boost ConverterWith Efficient Digital Control for
Thermoelectric Energy Harvesting |
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c*******v 发帖数: 2599 | 17 我说的就是这个阿,本版做这个的总共人数<5.你看看几个人回帖子就明白了.
我说的这个power是,low power, or ultra low power。 里面代表的block就是boost
/buck dcdc, power rectifier, voltage doubler,swtich capacitor,charge
pump,等等
综合起系统来就是 power management。
具体可以参考UW 这个文章作为例子:
A 20 mV Input Boost ConverterWith Efficient Digital Control for
Thermoelectric Energy Harvesting
|
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g*****g 发帖数: 3623 | 18 nice
our telecom rectifier 3kW 96%
老的7.5kW 92% |
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l*******k 发帖数: 1974 | 19 是不是反馈增益太大。MOSFET Gate PWM 信号应该在 rectified sine wave小的时候宽
。大的时候窄。 |
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l*******k 发帖数: 1974 | 20 是不是反馈增益太大。MOSFET Gate PWM 信号应该在 rectified sine wave小的时候宽
。大的时候窄。 |
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b*********y 发帖数: 830 | 21 或者废弃的power supplier. 由于成本原因,只能买二手的。 包子感谢提供信息的大
拿。 |
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z*****n 发帖数: 7639 | 24 我认为没什么太大关系。反正摄像机里面还有rectifier电路,
这个容量还大些。
4V, |
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c*****h 发帖数: 445 | 25 If the pin assignment is not the same, would the rectifier work to give a
proper power supply? |
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W***n 发帖数: 11530 | 26 You have a bright future, just gain some experience and return home to kick
off a long lasting rewarding career.
Here are a list of semi companies involved in mixed-sginal IC:
ACCO Semiconductor, Inc. Actions Semiconductor Co., Ltd. Adapteva, Inc.
Advanced Micro Devices, Inc. (AMD) Aeroflex Colorado Springs Altera
Corporation
Ambarella, Inc. Ambiq Micro Inc. AMIMON Ltd.
ams AG Analog Devices, Inc. (ADI) Analogix Semiconductor, Inc.
Apexone Microelectronics Applied Micro Circuits Corporation (App... 阅读全帖 |
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s**g 发帖数: 66 | 27 漫谈START UP电路一: 临渊羡鱼,退而结网
smzg
Jim Williams和 Bob Pease离开我们已经四年多了。众所周知,Jim是在公司中风走的
,而Bob则是从Jim葬礼回家的路上出的车祸;一个星期之内,如此戏剧性地走了一个时
代的两位代表人物,实为业界憾事。本文是作者对两位前辈的微薄致敬:一则希望发扬
Jim写书育人、博学谦卑的精神;二则试图回答Bob的一个公开问题:如何设计sure
start for bandgap reference(详见‘The Design of Band-Gap Reference Circuits
王小波《红拂夜奔》说:其实每一本书应该有趣,对于一些书来说,有趣是它存在的理
由;对于另一些书来说,有趣是它应达到的标准。
如果你读过Jim和Bob两位的文章,就不会否认一篇文字既可以很技术也可以很有趣。
Jim写的很多app notes 都非常生动,还往往以一个漫画结尾;很夸张,其中一篇居然
画了好多婴儿奶瓶,奶瓶的多少代表一个项目所花时间的多少-当时他儿子刚刚出生。
随着时间的流逝,他们的很多文章技术内容不再跟得上潮流,可是漫画还跟从前一... 阅读全帖 |
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k********y 发帖数: 84 | 28
I agree with littlenorth.
Many of what FallenEmbers said in his original post are true, and are
reasonable precautions to people who are contemplating about going to law
school. However, littlenorth's corrections of certain statements are also
absolutely true. FallenEmbers, you may not know some of these facts because
of your unique position as an in-house counsel rather than working as an
associate in a biglaw firm, so I do not begrudge you about it.
As to you pointing out the fact that there ... 阅读全帖 |
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n****e 发帖数: 109 | 29 【 以下文字转载自 JobHunting 讨论区 】
发信人: nowree (nowree), 信区: JobHunting
标 题: [ 工作机会 ] 推荐职位Project Manager Position in Bay Area
发信站: BBS 未名空间站 (Fri Apr 10 18:44:01 2015, 美东)
Project Manager Position in Bay Area
GC or citizenship required
contact me at [email protected]
/* */
Job Description
OVERVIEW:
Office location will Bay Area of California.
Provides direction and management for small to medium-sized projects and
ensures on-schedule completion within or below budget in accordance with
contra... 阅读全帖 |
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发帖数: 1 | 30 from: Liang Xue
to: John Hutchinson
cc: Tomasz Wierzbicki
date: Mon, Aug 11, 2014 at 12:12 PM
subject: Re: No winners--follow-up
Dear John,
Thank you for your email. I had a difficult time to understand the
message you want sent. My guess is that the central message you would like
to emphasize is that you can develop the same model once you understood that
ductile fracture is indeed J3 dependent. Possibly. I
believe many people have the necessary knowledge to do so on their
own. H... 阅读全帖 |
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s********d 发帖数: 16 | 31 Sorry, I want to take STEP 1 exam at the end of 2012.
I have rectified the title and updated my contact e-mail.
Thanks! |
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F****n 发帖数: 438 | 32 【 以下文字转载自 Medicalpractice 讨论区 】
发信人: FeiLun (Is Horrible), 信区: Medicalpractice
标 题: 几篇期刊文章
发信站: BBS 未名空间站 (Sat Jul 12 22:36:30 2014, 美东)
那位大侠可以帮组查一下这几篇的全文吗?叩谢。
请发:y******[email protected].
I.
Role of small-conductance calcium-activated potassium channels in atrial
electrophysiology and fibrillation in the dog.
Qi XY1, Diness JG, Brundel BJ, Zhou XB, Naud P, Wu CT, Huang H, Harada M,
Aflaki M, Dobrev D, Grunnet M, Nattel S.
Author information
Abstract
BACKGROUND:
Recent evidence points to functional... 阅读全帖 |
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n**r 发帖数: 1587 | 33 post for my recruiter, please contact them directly.
f******************[email protected]
Contact : 201 468 0519
Statistical Modeling-(PhD) - New York
Our clients, top-tier Management consulting firms advising international
banks and other financial firms based in NY, are looking for PhDs with
strong statistical modeling skills to join Quantitative Research & Analytics
teams.
The group conducts extensive research and builds prototype models that
estimate the economic stress on the credit risk of struc... 阅读全帖 |
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j*****1 发帖数: 66 | 34 【 以下文字转载自 JobHunting 讨论区 】
发信人: johnus1 (John), 信区: JobHunting
标 题: SAS Quant Developer - Los Angeles
发信站: BBS 未名空间站 (Mon Sep 15 01:03:38 2014, 美东)
contractor 职位,但可以办H1B transfer(不能申请新的H1B),如果合适会长期雇用
。公司是个Fixed Income Asset Management Firm.
发简历到 [email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previousSibling;a=l.getAttribute('data-cfemail');if(a){s='';r=parseInt(a.substr(0,2),16);for(j=2;a.length-j;j+=2){c=parseInt(a.substr(j,2),16)^... 阅读全帖 |
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j*******2 发帖数: 309 | 35 for 第2问, I think you are right.colinearity makes it difficult to estimate
and interpret a particular regression coefficient because the data have
little information about the effect of changing one variable while holding
another variable constant. However, colinearity does not affect the joint
influence of highly correlated variables when tested simultaneously.
therefore, once groups of highly correlated predictors are identified, the
problem can be rectified by testing the contribution of an en... 阅读全帖 |
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w**********3 发帖数: 13 | 37 【 以下文字转载自 JobMarket 讨论区 】
发信人: weiweizhu123 (喂喂猪), 信区: JobMarket
标 题: 【工作机会】Production Analytics Sr. Developer in Bank of the West
关键字: job bank Developer
发信站: BBS 未名空间站 (Thu Apr 9 19:07:49 2015, 美东)
If interested, please send your resume to [email protected]
/* */
This is a senior position and will lead a small team. Please send your
resume based on your background. Thanks!
Location:San Francisco,CA
Position Summary
To provide the Bank vital loan production analytics and report to provi... 阅读全帖 |
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F****n 发帖数: 438 | 38 来自主题: Medicalpractice版 - 几篇期刊文章 那位大侠可以帮组查一下这几篇的全文吗?叩谢。
请发:y******[email protected].
I.
Role of small-conductance calcium-activated potassium channels in atrial
electrophysiology and fibrillation in the dog.
Qi XY1, Diness JG, Brundel BJ, Zhou XB, Naud P, Wu CT, Huang H, Harada M,
Aflaki M, Dobrev D, Grunnet M, Nattel S.
Author information
Abstract
BACKGROUND:
Recent evidence points to functional Ca2⁺-dependent K⁺ (SK)
channels in the heart that may govern atrial fibrillation (AF) risk, but the
underlying mechanisms are... 阅读全帖 |
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M***D 发帖数: 249 | 39 Suicide and the Young Physician
By Alexandra Sowa McPartland
Graduating from medical school and starting residency training should be one
of the most exciting times in a physician’s career. Instead, for two newly
-minted New York City doctors, who ended their lives within a week of each
other this summer, this period marked a morbid end. They represent a tragic
and rarely discussed phenomenon in the medical profession: Doctors commit
suicide at a rate more than twice the national average. Eve... 阅读全帖 |
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d******n 发帖数: 61 | 40 I and my mother will come home, all items fire sale! What guarantee is not
cheap goods,
Note: low price sell cars: 13 years MINI: 1.6 L displacement milk white
28000 kilometers Regular maintenance, car condition is good, no any
accidents and scratches
To ZOOM, a mountain bike, brands, car buyers to send mountain bike
accessories, air pump, anti-theft locks, and poncho.
2. Women's bicycle: a (9) is new car accessories, bicycle pump, anti-theft
lock and poncho.
3. Apple iphone6 (64 g) local tyrant... 阅读全帖 |
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h*h 发帖数: 18873 | 41 1.
Paul Souders/ Wildlife Photographer of the Year; WINNER: Animals in Their
Environment
The fact that most images of polar bears show them on land or ice says more
about the practical difficulties faced by humans than it does about the
bears’ behaviour. With adaptations such as thick blubber and nostrils that
close, polar bears are, in fact, highly aquatic and they spend most of their
time hunting seals on sea ice and are capable of swimming for hours at a
time. Paul took his Zodiac boat to Hud... 阅读全帖 |
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o**********e 发帖数: 18403 | 42 The Chinese American community has yet to fully
recover from the injustice of the Chinese
Exclusion Act. This unjust law caused population
collapse of Chinese Americans, effectively sterilizing the few remaining,
driven them to illegal business-dealings and caused
general distrust of authority in the Chinese American
community.
Evidences:
1. We could point to the dearth of Chinese
American lawyers, judges, politicians who dare
to celebrate their Chinese heritage (rather than apologizing
for ... 阅读全帖 |
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M******a 发帖数: 6723 | 43 来自主题: Mod_CHN_Hist版 - 奉天兵工厂 https://wwiiafterwwii.wordpress.com/2017/04/03/mukden-arsenal-after-wwii/
Mukden Arsenal after WWII
April 3, 2017 jwh19752 Comments
(Zhang's Gate, the old entrance to Mukden Arsenal)
For people interested in Japanese firearms of WWII, the name Mukden Arsenal
is familiar. The history of the facility after Japan's defeat is less well
known. Under various names, it did survive for some time, producing an odd
mix of WWII weapons after the war's end.
(Mukden Arsenal proofmark during WWII)
Mukden an... 阅读全帖 |
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c****9 发帖数: 5402 | 44 机子本身又没有unlock,需要自己开机时输入。那开箱干嘛?IMEI就在盒子上印着的呀。
难道真的是refurbished的或者rectified的? |
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m******o 发帖数: 3372 | 45 After millenniums of human history and storytelling, there are just no
original stories any more. When you think something is unique, it's because
you have not seen the full picture yet. Life is full of cliches, bullshits,
and inescapable traps.
This is less and less like a real typing practice. So now I am going to
rectify the digression. Everything below will be nonsense.
Why are students asked to donate money to give the professors presents at
the end of the semester? Are they paid enough fro... 阅读全帖 |
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y*******n 发帖数: 10103 | 46 打着火后,用万用表测电压是多少?
如果低于14.0伏,说明你的充电系统比较弱。可以检查
1.alternator
2.rectifier/regulator
3.conductor connection |
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