c******w
发帖数: 1108 | 1 用一个circular array存most recent W hashtags
用一个size不超过W的doubleLinkedList of
DLL_Node{
String hashtag;
int frequency;
DLL_Node prev, next;
}
存circular array里的unique hashtag和对应的frequency。并按frequency排序。
用一个HashMap来通过hashtag找到doubleLinkedList里对应的node。
扫进来一个已有的（或新的）hashtag，找到（或create）对应的node，frequency++，
然后比较prev.frequency。如果 > 就swap。repeat till <=
对被挤走的hashtag，frequency--,然后比较next.frequency。如果 < 就swap。repeat
till >=。 为0则remove。 |
|
c******w
发帖数: 1108 | 2 用一个circular array存most recent W hashtags
用一个size不超过W的doubleLinkedList of
DLL_Node{
String hashtag;
int frequency;
DLL_Node prev, next;
}
存circular array里的unique hashtag和对应的frequency。并按frequency排序。
用一个HashMap来通过hashtag找到doubleLinkedList里对应的node。
扫进来一个已有的（或新的）hashtag，找到（或create）对应的node，frequency++，
然后比较prev.frequency。如果 > 就swap。repeat till <=
对被挤走的hashtag，frequency--,然后比较next.frequency。如果 < 就swap。repeat
till >=。 为0则remove。 |
|
w******e
发帖数: 3 | 3 贴一段代码，求大牛鉴定，先sort frequency，然后greedy
public int minKeyClicks(int[] keySize, int[] frequency){
int totalSize = 0;
for(int size : keySize)
totalSize += size;
if(frequency.length > totalSize){
return -1; //Illegal input
}
int totalClick = 0;
int i = frequency.length -1;
Arrays.sort(frequency);
int level = 1; //consume first click with max frequency
while( i >= 0){
int k = 0;
whil... 阅读全帖 |
|
w****a
发帖数: 6326 | 4 ☆─────────────────────────────────────☆
tytjk (tytjk) 于 (Wed Jul 25 21:45:09 2012, 美东) 提到:
大家有测过吗？网上说3mG以下可以，也有说1mG的。
但是我测量了很多的房子都是4-5，街道上还有5以上的，不知道可不可以？
☆─────────────────────────────────────☆
Roethlisberg (Big Ben) 于 (Wed Jul 25 21:46:14 2012, 美东) 提到:
单位对么？是特斯拉还是高斯？
☆─────────────────────────────────────☆
tytjk (tytjk) 于 (Wed Jul 25 21:47:26 2012, 美东) 提到:
mili Gauss
☆─────────────────────────────────────☆
Roethlisberg (Big Ben) 于 (Wed Jul 25 21:51:32 2012, 美东) 提到:
我测都不到0.5... 阅读全帖 |
|
t******o
发帖数: 3223 | 5 公布的交易价还能相信吗？
Dark markets may be more harmful than high-frequency trading
http://finance.yahoo.com/news/dark-markets-may-more-harmful-044
NEW YORK (Reuters) - Fears that high-speed traders have been rigging the U.S
. stock market went mainstream last week thanks to allegations in a book by
financial author Michael Lewis, but there may be a more serious threat to
investors: the increasing amount of trading that happens outside of
exchanges.
Some former regulators and academics say so much trading... 阅读全帖 |
|
b***i
发帖数: 10018 | 6 http://www.letsrun.com/forum/flat_read.php?thread=4519027&page=
Looking the posts from jaguar1:
I did my Master's thesis on enhancing bone recovery with whole body
vibration training-- basically a low-magnitude, high frequency stimulus. You
could equate this to ~walking, standing, low-intensity running. Low
intensity activity is both safer and more anabolic to both soft and hard
tissue. It's also more likely to be sustained long term and consistently--
it's what maintains bone/muscle mass. When ... 阅读全帖 |
|
t******a
发帖数: 151 | 7 when you set up the solution frequency, add a sweep into it. here you can se
t your frequency range.
it will give you sparameters, field plot in your frequency range. add infini
te sphere in radiation, then you can check antenna parameters.
I don't quite understand the solution frequency in HFSS setting.
What kind of solution does HFSS get at this single frequency? S parameter?
How could it use a single frequency solution to get a result over a
frequency range?
Thanks for your input. |
|
l********r
发帖数: 123 | 8 （轉自人人網）
現在壹些中國人，為了把成吉思汗吹成中國人，已經到了令人發指的地步。壹開始在教
科書上吹，鬧成了國際笑柄。後來又弄出了所謂“蒙古人起源於中國”“外蒙人是內蒙
人奴隸”的可笑謬論。而最近網絡上出現了壹段視頻，內容居然是上海復旦大學生命科
學學院教授李輝通過基因檢測斷定成吉思汗是的父系是漢人，而且還號稱在國際上發表
了相關論文。然後筆者就用英文搜索李輝對外發表的這篇論文，於是有趣的東西出現了。
以下就是上海復旦大學復旦大學生命科學學院教授王傳超和李輝在國際上對外發表的論
文中提及成吉思汗的部分：
---------------------
Inferring human history in East Asia from Y chromosomes
Chuan-Chao Wang and Hui Li*
Haplogroup O-M175 is the largest haplogroup in East Asia, comprising
roughly 75% of the Chinese and more than half of the Japanese populat... 阅读全帖 |
|
i***z
发帖数: 7508 | 9 【 以下文字转载自 History 讨论区 】
发信人: lionmaster (广东武士), 信区: History
标 题: 漢人稱“成吉思汗父系是漢人基因”，遭滿人怒批
关键字: 蒙古 满洲 阿尔泰 历史 成吉思汗
发信站: BBS 未名空间站 (Wed Aug 20 09:34:47 2014, 美东)
（轉自人人網）
現在一些中國人，為了把成吉思汗吹成中國人，已經到了令人發指的地步。一開始在教
科書上吹，鬧成了國際笑柄。後來又弄出了所謂“蒙古人起源於中國”“外蒙人是內蒙
人奴隸”的可笑謬論。而最近網絡上出現了一段視頻，內容居然是上海復旦大學生命科
學學院教授李輝通過基因檢測斷定成吉思汗是的父系是漢人，而且還號稱在國際上發表
了相關論文。然後筆者就用英文搜索李輝對外發表的這篇論文，於是有趣的東西出現了。
以下就是上海復旦大學復旦大學生命科學學院教授王傳超和李輝在國際上對外發表的論
文中提及成吉思汗的部分：
---------------------
Inferring human history in East Asia from Y chromosomes
Chuan-Ch... 阅读全帖 |
|
I******6
发帖数: 500 | 10 对的. WIFI 也危险,但是 WIFI 的频率和 功率 要低一些. 5G 要 高的多.
5 GHz WiFi routers are more dangerous because they are twice the frequency
with more intensity than the standard 2.45 GHz models. In the Radio
Frequency (RF) Radiation world, the higher the frequency the more dangerous
it is to us. 2.45 GHz is the same frequency your microwave oven uses to cook
food. The amps used are different but it is the same frequency. The World
Health Organization has classified this RF Radiation as a possible “
carcinogen“... 阅读全帖 |
|
I******6
发帖数: 500 | 11 5G 确实很 危险. 只有 国内 以国家力量 推广 华为的 5G. 底下的 是 内容
是 英文的. 很多国内的 人 更 愿意相信 英文 内容. 搜狐 CEO 说了几句 5G 的
坏话,就 被骂的臭头.
对的 WIFI 也危险,但是 WIFI 的频率和 功率 要低一些. 5G 要 高的多.
5 GHz WiFi routers are more dangerous because they are twice the frequency
with more intensity than the standard 2.45 GHz models. In the Radio
Frequency (RF) Radiation world, the higher the frequency the more dangerous
it is to us. 2.45 GHz is the same frequency your microwave oven uses to cook
food. The amps used are different but it is the ... 阅读全帖 |
|
发帖数: 1 | 12 尼古拉·特斯拉 （塞尔维亚裔美籍科学家） 编辑
尼古拉·特斯拉（Nikola Tesla，1856年7月10日~1943年1月7日），塞尔维亚裔美籍发
明家、机械工程师、电气工程师。他被认为是电力商业化的重要推动者之一，并因主持
设计了现代交流电系统而最为人知。在迈克尔·法拉第发现的电磁场理论的基础上，特
斯拉在电磁场领域有着多项革命性的发明。他的多项相关专利以及电磁学的理论研究工
作是现代的无线通信和无线电的基石。[1-2]
中文名 尼古拉·特斯拉 外文名 Nikola Tesla、Никола Тесла 别 名
尼科·特斯拉（Niko Tesla） 国 籍 奥匈帝国（后移民美国） 民 族 塞尔维亚
族（南斯拉夫人） 出生地 克罗地亚 出生日期 1856年7月10日 逝世日期 1943年1月7
日 职 业 发明家、机械工程师、电气工程师 毕业院校 格拉茨理工大学（实际未毕
业） 信 仰 塞尔维亚东正教 主要成就 交流电系统、无线电系统、无线电能传输、
雷达、放大发射机 代表作品 《My Inventions》《The Dynamic Theory of... 阅读全帖 |
|
s*****o
发帖数: 1540 | 13 我对音响一窍不通，希望大侠推荐300元之下的功放:
http://www.martinlogan.com/pdf/manuals/manual_mlt2.pdf
MLT-2 SPEAKER (front and rear)
System Frequency Response
110–20,000 Hz ± 2db
Sensitivity
88 [email protected] volts/meter
Impedance
8 Ohms compatible
Crossover Frequency
2000Hz
Tweeter Type
1” (2.54 cm) soft dome
Woofer Type
4.5” (11.5 cm) high rigidity poly cone
with extended throw drive assembly
Enclosure Type
Non-resonance asymmetrical
chamber format, sealed
Suitable Amplifier Range
15–100 watts
Power Handling
50 watts
Wei... 阅读全帖 |
|
E***X
发帖数: 885 | 14 I am posting the jobs for one of the best recruiters I have worked with.
Please contact Kathleen directly as following:
Kathleen Mitchell
Executive Recruiter
f******************[email protected]
Contact : 201 468 0519
High Frequency Connectivity Developer
The Quantitative Prime Services team is part of the Equities Technology
organization at Barclays Capital.
This team is responsible for the development and maintenance of a low
latency trading platform that
caters to clients engaged in high-frequency ... 阅读全帖 |
|
l********r
发帖数: 123 | 15 （轉自人人網）
現在一些中國人，為了把成吉思汗吹成中國人，已經到了令人發指的地步。一開始在教
科書上吹，鬧成了國際笑柄。後來又弄出了所謂“蒙古人起源於中國”“外蒙人是內蒙
人奴隸”的可笑謬論。而最近網絡上出現了一段視頻，內容居然是上海復旦大學生命科
學學院教授李輝通過基因檢測斷定成吉思汗是的父系是漢人，而且還號稱在國際上發表
了相關論文。然後筆者就用英文搜索李輝對外發表的這篇論文，於是有趣的東西出現了。
以下就是上海復旦大學復旦大學生命科學學院教授王傳超和李輝在國際上對外發表的論
文中提及成吉思汗的部分：
---------------------
Inferring human history in East Asia from Y chromosomes
Chuan-Chao Wang and Hui Li*
Haplogroup O-M175 is the largest haplogroup in East Asia, comprising
roughly 75% of the Chinese and more than half of the Japanese populat... 阅读全帖 |
|
E***X
发帖数: 885 | 16 I am posting the jobs for one of the best recruiters I have worked with.
Please contact Kathleen directly as following:
Kathleen Mitchell
Executive Recruiter
f******************[email protected]
Contact : 201 468 0519
High Frequency Connectivity Developer
The Quantitative Prime Services team is part of the Equities Technology
organization at Barclays Capital.
This team is responsible for the development and maintenance of a low
latency trading platform that
caters to clients engaged in high-frequency ... 阅读全帖 |
|
r*********i
发帖数: 67 | 17 1. you are sort of right. However, 14.204 = 3.644 + 0.099 + 10.461.
Image that there is some logic first, then a register(FlipFlop), then the
output pad. 3.644 is the delay of the logic in front. Then the delay in the
FF (from d to q you know) is 0.099. Then 10.461 is the time from the
register output to the output pad. All other numbers are just the breakdown
of the three numbers. 3.644 is not the clock tree delay. All these are
relative to the clock at the input. You should not worry about cl... 阅读全帖 |
|
c*****e
发帖数: 238 | 18 I doubt it, both moduli depend on the frequency, and in the gel phase
the dependences are both nontrivial and different: one goes to constant at
large frequency and vanishes at small frequency, the other gradually decreases
at large frequency but remains finite at small frequency.
How can their ratio become independent of frequency?
I am referring to physical gels. |
|
w********g
发帖数: 107 | 19 as your calculation:
( 9/50) x (1/2) x( 1/10) x (1/2)= 0.0045
but the correct answer in this question is (B) 0.045 =( 9/50) x (1/2) x( 1/
10) x (1/2)
Actually, 0.045 is the best answer here but not the perfect one.
I saw another version of this question as below:
A man is a known heterozygous carrier of a mutation that causes
hemochromatosis (AR). Suppose that 1% of the general population consists of
homozygotes for this mutation. If the man mates with somebody from the
general population, wh... 阅读全帖 |
|
t*******8
发帖数: 67 | 20 Hi, all,
If you are interested, please send me resume in word version to
t**[email protected].
The comp is open.
Thanks.
Thomas Gan, Ph.D.
Options Group
http://www.linkedin.com/pub/tom-gan/3/64b/93a
1 - Risk Quantitative
Key Responsibilities;
- Review of all risk models to ensure accuracy
- Construction of new models as needed as the firm trades new
products. This may be as simple as a RiskMetrics implementation to
something more complex requiring building valuation from scratch in
Excel... 阅读全帖 |
|
D********n
发帖数: 978 | 21 By JACOB BUNGE
For once, it isn't the high-frequency traders taking the blame for a wild
market ride.
Germany's main exchange operator has found that a miniature "flash crash" in
late August—in which stock-index futures dived 4% before recovering in a
matter of minutes—was simply the result of a barrage of selling by
financial institutions, and not the handiwork of superfast computerized
traders.
So-called high-frequency trading firms drew suspicions following the
gyration, but an internal repor... 阅读全帖 |
|
w*******y
发帖数: 60932 | 22 These are great to be used for the following configuration in a 7.1 Surround
Speaker Setup...Surround back (Left/Right)
Two front height channels positioned above the front channels (Left/Right)
Two front wide channels positioned between the front and surround channels (
Left/Right)
Speaker Details:
One Woofer. One Tweeter. One Magical ExperienceThe shallow aluminum cabinet
in sleek black creates a speaker that blends beautifully into your room,
while delivering the sound quality that has made E... 阅读全帖 |
|
f****r
发帖数: 5118 | 23 懂信号处理的帮忙分析一下 Wow Signal，俺以前懂，现在虾米了
这个东西说不定正往地球飞过来呢
http://en.wikipedia.org/wiki/Wow!_signal
The Wow! signal was a strong narrowband radio signal detected by Dr. Jerry R
. Ehman on August 15, 1977, while working on a SETI project at The Big Ear
radio telescope of The Ohio State University.[1] The signal bore expected
hallmarks of potential non-terrestrial and non-solar system origin. It
lasted for the full 72 second duration that Big Ear observed it, but has
not been detected again. Much attenti... 阅读全帖 |
|
h*****d
发帖数: 244 | 24 ABO Blood Type System
We have learned a good deal about how common each of the ABO blood types is
around the world. It is quite clear that the distribution patterns are
complex. Both clinal and discontinuous distributions exist, suggesting a
complicated evolutionary history for humanity. This can be seen with the
global frequency patterns of the type B blood allele (shown in the map below
). Note that it is highest in Central Asia and lowest among the indigenous
peoples of the Americas and A... 阅读全帖 |
|
发帖数: 1 | 25 US Must Hustle On Hypersonics, EW, AI: VCJCS Selva & Work
By SYDNEY J. FREEDBERG JR. on June 21, 2018 at 3:52 PM
WASHINGTON: China is besting the United States in key military technologies
like hypersonic missiles and electronic warfare, Gen. Paul Selva, vice-
chairman of the Joint Chiefs said today. We can still catch up, he predicted
.
What about Artificial Intelligence? That’s too close to call, said former
deputy Defense Secretary Bob Work, so we’d better get a move on. Both men
spoke at a C... 阅读全帖 |
|
g********d
发帖数: 4174 | 26 Jump to…Top of pageAbstractIntroductionMaterials and
methodsResultsDiscussionConclusionAcknowledgementsReferences
Introduction
Top of page
Abstract
Introduction
Materials and methods
Results
Discussion
Conclusion
Acknowledgements
References
The National Blood Services of the UK have, since the early 1980s, asked men
who have ever had sex with men (MSM) to not donate blood. At first, this
action was motivated by the aim of preventing transmission by transfusion of
the infectious agent associated ... 阅读全帖 |
|
n***p
发帖数: 7668 | 27 真是“百无一用是书生”啊。 IIHS的解释里说了， Injury部分的赔付只考虑claim
frequency,而不考虑每次赔付的具体数额。显然，那些personal injury and
medical payment 数字表明的是那些车的司机和乘客是不是比较容易受伤，或者
那些司机和乘客比较容易假装受伤，至于受伤程度--或者说司机和乘客假装受伤来骗
保的程度--不在考虑范围。所以说，你攻击这些数据也好，攻击贴数据的人也好，好歹
也看清楚数据里写的是啥。
鉴于这些数据没有考虑赔付的具体数额，你可以说，有些车尽管claim frequency
高，但是有可能每次司机和乘客受伤其实比较轻，那些claim frequency低的车，
可能其实每次司机和乘客非死即残。至于这个论点是不是站得住脚，那就是另一回事。
http://www.iihs.org/research/hldi/composite
Results for collision, property damage liability and
comprehensive represent overall losses, which... 阅读全帖 |
|
l******h
发帖数: 2 | 28 Highly reputational company with very competitive compensation for all
positions.
Please send in your resume and position/positions you like to apply to my
email address below.
h*******[email protected]
All resumes will be deliver to hiring manager directly. Act fast!
Thanks!
Silicon Engineering Group
Sr. Physical Design Timing Engineer
Timing (STA) Manager
Senior Physical Design Engineer
CAD Manager - Front-End Design and Verification
Sr. CAD Engineer - Place & Route / Physical Design Engineer
Sr. CA... 阅读全帖 |
|
k******9
发帖数: 878 | 29 如果准备买JBL ES80，那Onkyo TX-NR626可以搭配吗，我把参数都列在下面，麻烦高手
看看，谢谢了
JBL ES80. Specifications General Specifications Finish Black Series ES Wall-
Mount Capable No Type Floorstanding Audio Specifications Crossover
Frequencies 700Hz, 3.6kHz a?" 24dB/octave; 12kHz a?" 18dB/octave Maximum
Recommended Amplifier Power 200W Power Handling (Recommended) 100W
Sensitivity (2.83V@1m) 91dB Power Handling (Peak) 400W Nominal Impedance 8
ohms Frequency Response 45Hz a?" 40kHz Speaker Specifications High-Frequncy
Transduc... 阅读全帖 |
|
w******i
发帖数: 1476 | 30 SAS Interview Questions from http://www.sconsig.com/
Very Basic
What SAS statements would you code to read an external raw data file to a DATA
step?
How do you read in the variables that you need?
Are you familiar with special input delimiters? How are they used?
If reading a variable length file with fixed input, how would you prevent SAS
from reading the next record if the last variable didn't have a value?
What is the difference between an informat and a format? Name three informats
or format... 阅读全帖 |
|
s********e
发帖数: 425 | 31 之所以把FPGA compiler这个组名列出来，是因为他们问的问题主要是针对他们每天做
的工作提出的问题。所以可能这些问题只针对这个组有参考性。另外也可以看出一个规
律就是，各个组是针对自己每天都做什么东西来问问题的。
面试是两个人问的。
首先是他们简要介绍了一下他们要做的工作，就是做基于FPGA的LabView。
然后一个人问了一个Behavior question: Given a specific example of how your
debug your code.
我举了一个写Simulated Annealing算法时候的例子。
另一个人熟悉Simulated Annealing，于是他就继续问我你用这个算法解决的是什么问
题。
然后其中一人说，我们做这个工作既要对硬件知识有所掌握，又要对软件了解。所以他
们开始问一些硬件方面的概念型问题，比如什么叫Synchronize circuit（有个global
clock），什么决定了Max clock frequency（longest combinational logic path），
如果pipeline一个circ... 阅读全帖 |
|
c*******r
发帖数: 610 | 32 最近面了几家公司，上店面经, 攒点人品
amazon
三哥，given a binary matrix， find out the total number of islands， （
geeksforgeeks原题）
跟这里的面经一模一样：http://www.mitbbs.com/article_t/JobHunting/32721661.html
面得很早1月底瑞苦肉特找我就随便面了下，很久没有准备算法了，知道是dfs，但是写
不出来，汗啊，挂了，自此以后努力准备3个月的算法
bloomberg
版上国人大哥内推的，无论如何应该感谢。
国人大哥先要面试我才决定给我内推（可能大哥办事认真）。 内推后另一位国人大哥
面的，虽然
说的是英文，告诉我的是英文名，但是改不了口音，一堆c++问题，好多都忘了，大概
有几道是下面的：
1. c++ pointer/reference, when to use pointer, when to use reference
2. implement linked list. implement copy assignment operator fo... 阅读全帖 |
|
f*********l
发帖数: 46 | 33 我们的手机，几乎每个键都对应字母： key2 -> 'abc', key3 -> 'def', key4 -> '
ghi'....老式的手机打字的原理是，如果你要打出a，你需要按1下key2. 如果要打出b
，你需要按2下key2， 打出c就要按3下key2，因为c排在key2的第三位。
所以题目是给出，keySize[] 每个element代表能存放的最多character， 比如上面的
例子就是[3,3,3],因为每个key都能最多放3个字母； 还有frequency[]，每个element
代表每个character出现的频率。要求把character排入key中，通过上面的方法打出所
有frequency数组中的character，最少的按键次数。
下面给个例子，比如我们的keysize是 [3,1,2]，我们的character的frequency是 [3，
3, 3， 2,1,1]。 如果把frequency中头三个字母index0 - index2放入key1， index3
放入key2，index4-index5放入key3，这样的按键次数就是 3*1 + 3*2 ... 阅读全帖 |
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l******h
发帖数: 2 | 34 Highly reputational company with very competitive compensation for all
positions.
Please send in your resume and position/positions you like to apply to my
email address below.
h*******[email protected]
All resumes will be deliver to hiring manager directly. Act fast!
Thanks!
Silicon Engineering Group
Sr. Physical Design Timing Engineer
Timing (STA) Manager
Senior Physical Design Engineer
CAD Manager - Front-End Design and Verification
Sr. CAD Engineer - Place & Route / Physical Design Engineer
Sr. CA... 阅读全帖 |
|
c*****r
发帖数: 2866 | 35 Unfortunately there is no plan to reopen it. Delta has returned the route to
Dept. of Transportation.
http://www.centreforaviation.com/news/delta-air-lines-withdraws
"There is a large surplus of U.S.-China combination frequencies.
Contemporaneous with this motion, Delta is filing a letter with the
Department returning seven additional frequencies previously allocated for
Atlanta-Shanghai service. With the return of these frequencies, there will
be 37 combination frequencies available in the unal... 阅读全帖 |
|
l*****r
发帖数: 687 | 36 【 以下文字转载自 board 讨论区 】
发信人: lajabor (我是冠军！内定的！), 信区: board
标 题: Re: [申请] Running版版副--bendm
发信站: BBS 未名空间站 (Sat Jan 9 21:01:41 2016, 美东)
Journal of the American College of Cardiology
Dose of Jogging and Long-term Mortality: The Copenhagen City Heart Study
Peter Schnohr, MD, DMSC; James H. O'Keefe, MD; Jacob L. Marott, MSC; Peter
Lange, MD, DMSC; Gorm B. Jensen, MD, DMSC
Disclosures
J Am Coll Cardiol. 2015;65(5):411-419.
Abstract and Introduction
Abstract
Background People who are physically acti... 阅读全帖 |
|
k******9
发帖数: 878 | 37 这种卡拉OK要求的音响，有什么参数要求，这方面一窍不通，听大家说音响容易烧坏，
那是要哪个参数高或者低？有具体的选购参数标准吗？
我在版上翻了翻，有推荐JBL ES80的，还有BOSE301的，前几天看到NEWEGG上有POLK打
折的，等等等，大家可以给个建议吗？
另外如果选好了音响，如何看功放的参数和音响是否匹配，不会烧坏也不会推不上去，
那要看哪几个项目的数值，实在是什么都不懂，望高手帮忙！感激不尽
如果准备买JBL ES80，那Onkyo TX-NR626可以搭配吗，我把参数都列在下面，麻烦高手
看看，谢谢了
JBL ES80. Specifications General Specifications Finish Black Series ES Wall-
Mount Capable No Type Floorstanding Audio Specifications Crossover
Frequencies 700Hz, 3.6kHz a?" 24dB/octave; 12kHz a?" 18dB/octave Maximum
Recommended Amplifier... 阅读全帖 |
|
e*******s
发帖数: 62 | 38 主板：Abit IP35-E
CPU: E2160 M0
HS: Rosewill RCX-Z775-SL 92mm dual-Ball CPU Cooler
DDR: Corsair 2GB (2x1GB) PC2-6400 5-5-5-12
Video: ATI x1650 pro 512MB GDDR2
General Information :
Real Frequency : 1998.22 MHz
Multiplier : 6x
Low/High Multiplier : 6x / 9x
Multiplier Locked : Yes
Marketing Frequency : 1800 MHz
Front Side Bus Information :
Bus Speed : 333 MHz
FSB Frequency : 1332.2 MHz (QDR)
Initial Frequencies :
Frequency : 1800 MHz
Bus Speed : 200.00 MHz (QDR) |
|
j***j
发帖数: 324 | 39 频率调制的范围是很广的，我已经说了，在ACAC DCAC领域（一般都是大功率），
frequency modulation 也很常用。在DCDC里面，resonant converter 也常用
frequency modulation，因为可以做到soft switching，开关loss 可能并不大。
但在lz的问题里面的pfm实际上指的只是一般dcdc converter light load 一种工作模
式。并不是广义上的frequency modulation。实际上这里的pfm 并不能通过控制
frequency 来控制电路的operation，跟广义上的frequency modulation不太一样。只
不过大家都约定俗成这个名称罢了。（就像通讯中的phase modulation跟control中的
phase不是一个意思。）datasheet里面这么写也没啥错，因为assume读者至少有些相关
背景，不会去扣字眼。
如果你想讨论你说的种种大功率的case，给一个具体的topology ＆ control
structure吧，大家可以讨论讨论。 |
|
H*******e
发帖数: 726 | 40 Even at extremely low frequency (60Hz) with high magnetic field strength,
there is no clinical evidence H field can cause damage on human being. Of
course, there are reports on people who live close to power line developing
leukemia. That's why most people avoid buying their houses near the power
line because of poor resale value.
Even if there are some induced currents in biological body at that low
frequency, the current intensity level usually delay by r^3.
Combination of low frequency+high p... 阅读全帖 |
|
o****e
发帖数: 536 | 41 Problem statement:
We often use a phase locked loop capable of generating a new frequency which
is locked in
phase to a clock that is supplied at a different frequency. The relationship
between the two
frequencies is given by a rational fraction - that is, there is a
multiplication step and a
division step, both of which are integers, to convert from one frequency to
the other.
For example, we may have a 10 MHz clock, and we need a 12 MHz clock which is
phase
locked to the 10 MHz clock. In this ... 阅读全帖 |
|
s********e
发帖数: 425 | 42 【 以下文字转载自 JobHunting 讨论区 】
发信人: sunnystate (路一直都在), 信区: JobHunting
标 题: [新鲜面经]intern NI(National Instruments) FPGA compiler 组
发信站: BBS 未名空间站 (Tue Mar 6 16:09:55 2012, 美东)
之所以把FPGA compiler这个组名列出来，是因为他们问的问题主要是针对他们每天做
的工作提出的问题。所以可能这些问题只针对这个组有参考性。另外也可以看出一个规
律就是，各个组是针对自己每天都做什么东西来问问题的。
面试是两个人问的。
首先是他们简要介绍了一下他们要做的工作，就是做基于FPGA的LabView。
然后一个人问了一个Behavior question: Given a specific example of how your
debug your code.
我举了一个写Simulated Annealing算法时候的例子。
另一个人熟悉Simulated Annealing，于是他就继续问我你用这个算法解决的是什么问
题。
... 阅读全帖 |
|
a****l
发帖数: 8211 | 43 frequency resolution (the frequency difference of neighboring bins) is not
determined by frequency range. That being said, on a standalone instrument,
it might be possible that your choice of frequency range might affect the
other parameter(s) which actually affect(s) the frequency range. |
|
g****t
发帖数: 31659 | 44 这两者是有联系的.
Bode有个定理,任何一个线性机器,不确定性从0到无穷大频率的积分恒定.
测量的机器,如果cover的频率很广,就很难准.
具体的机器不一定能被这个定理说明,但zhaoyun说的概念,在信号处理的
物理上是肯定对的.
换句话说,不同频率的较高精度测量,必须用不同的机器.
这也和我们日常实践符合.
frequency resolution (the frequency difference of neighboring bins) is not
determined by frequency range. That being said, on a standalone instrument,
it might be possible that your choice of frequency range might affect the
other parameter(s) which actually affect(s) the frequency range. |
|
w*****1
发帖数: 220 | 45 Dear Readers,
We are happy to present the first five papers that are published in our
new, open access journal, Physical Review X. These papers, together with
others that are to be published in the coming weeks into September, will
constitute the first issue of the journal. Under PRX's open access
publishing model, they are free for you to read and use.
We are very encouraged by the breadth of their topical spread. It ranges
from the well-established field of atomic, molecular and optica... 阅读全帖 |
|
发帖数: 1 | 46 QUANTUM SPACE ELEMENTS (QSE)
INTRODUCTION
This is a non-mathematical proposal introducing a cosmological model that is
cyclic, deterministic and infinity-free. For the purpose of achieving this
objective a number of new concepts are introduced. The framework of this
proposal is structured over a number of assumptions, leading to various
considerations of cosmological concerns. Furthermore, verification methods
are suggested of both, observational and mathematical nature.
ASSUMPTIONS
Space is dis... 阅读全帖 |
|
l*****r
发帖数: 687 | 47 Journal of the American College of Cardiology
Dose of Jogging and Long-term Mortality: The Copenhagen City Heart Study
Peter Schnohr, MD, DMSC; James H. O'Keefe, MD; Jacob L. Marott, MSC; Peter
Lange, MD, DMSC; Gorm B. Jensen, MD, DMSC
Disclosures
J Am Coll Cardiol. 2015;65(5):411-419.
Abstract and Introduction
Abstract
Background People who are physically active have at least a 30% lower risk
of death during follow-up compared with those who are inactive. However, the
ideal dose of exercise for... 阅读全帖 |
|
s*****r
发帖数: 11545 | 48 这个型号不行， 既非双卡频段也不全。
XT1806 频段很全， 但是却不是双卡。
有些型号也不是双摄。
Compatibility
Bluetooth Enabled
Yes
NFC Technology
No
Charging Interface(s)
Micro USB
Expandable Memory up to
128 gigabytes
SIM Card Size
Nano SIM
SIM Card Slots
Single SIM
Carrier Compatibility
AT&T, Cricket, Go-Phone, H2O Wireless, Net10, Simple Mobile, Sprint, T-
Mobile, TRACFONE, Verizon
General
Device Manufacturer
Motorola
Phone Style
Smartphone
Color
Lunar Gray
Color Category
Gray
Model Number
PA6R0003US
Network
Universal Unlocked
Yes
Dat... 阅读全帖 |
|
w*******y
发帖数: 60932 | 49 Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16855996358
Model
Brand DLO
Model DLA57878/17
Type FM Transmitter
Features
Play your Zune over your car's FM radio
Charge your Zune while you're on the road
IntelliTune finds the best station in one click
Easy, one-handed operation
4 feet cable for easy access to your Zune
No install necessary simply plug into any available auto power outlet
Spec
Specifications
Fm Transmitter
Modulation: FM Stereo... 阅读全帖 |
|
