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全部话题 - 话题: densities
首页 5 6 7 8 9 末页 (共10页)
z****e
发帖数: 2361
1
【 以下文字转载自 SanFrancisco 讨论区 】
发信人: zhazhe (zz), 信区: SanFrancisco
标 题: 谁有兴趣San Diego的职位,Solid State Disk/Flash Memory Architect
发信站: BBS 未名空间站 (Wed Jun 30 20:27:58 2010, 美东)
请联系我。很不错的group,很不错的manager,很不错的待遇。
关键词:
Senior System Architect - Storage Architect - Flash Memory Architect - Error
Correction - ECC - Matlab - LDPC - Low Density Parity Check - low-density
parity-check - Trellis - TCM - Trellis Modulation - BCH - C Programming - C+
+ - Signal Processing - DSP - Modulation Coding - Reed Solo
j**********g
发帖数: 153
2
来自主题: SanDiego版 - Pacific Highland小区规划图
从图上看大致2500尺以上才能算low density, Hampton lane竟然是low density
问过Pardee的人, 今年除了那个watermark没有在Pacific Highland造其他新房的计划
, 也不知道是不是真的
z****e
发帖数: 2361
3
请联系我。很不错的group,很不错的manager,很不错的待遇。
关键词:
Senior System Architect - Storage Architect - Flash Memory Architect - Error
Correction - ECC - Matlab - LDPC - Low Density Parity Check - low-density
parity-check - Trellis - TCM - Trellis Modulation - BCH - C Programming - C+
+ - Signal Processing - DSP - Modulation Coding - Reed Solomon - Reed-
Solomon - Viterbi - SSD - HDD - Solid State Disk - Hard Disk Drive
N**7
发帖数: 5796
4
要intern吗 好像都会的说

请联系我。很不错的group,很不错的manager,很不错的待遇。
关键词:
Senior System Architect - Storage Architect - Flash Memory Architect - Error
Correction - ECC - Matlab - LDPC - Low Density Parity Check - low-density
parity-check - Trellis - TCM - Trellis Modulation - BCH - C Programming - C+
+ - Signal Processing - DSP - Modulation Coding - Reed Solomon - Reed-
Solomon - Viterbi - SSD - HDD - Solid State Disk - Hard Disk Drive
H***a
发帖数: 506
5
来自主题: SanFrancisco版 - 在Dublin Ranch看到一个房
要是过2年就海归的话,还是慎重考虑一下吧,隔这么远管理自己的出租房很不方便啊
,除非你们经常回来,或者有可以全权委托信任的人在这边。
要是自己住,就east dublin吧,我们刚在这边买的房子,10月竣工。每个家庭在买房
子的时候都有自己的主次条件,在我们budget允许的范围内,我们觉得dublin是最好的
选择啦。你们要是能把budget加到50万以上,选择应该会更多一些,可以考虑lot小一
些的全新sfh了(比如sorrento里dr horton在盖的arrivare小区,看到他们8/30刚卖的
一个,$525k, 1765sqft, 3bd/3.5bth)
dublin ranch的high density区包括the terrace,the village那边的趴车一直是个大
问题,现在kb和charter在那边把原来要建商业区的一块地又改成high density住宅了
(据说300多户签的抗议书但是dublin city council还是不顾反对给批了)以后趴车问
题会更大。千万千万不要买一片不带车库的房子。
W**********r
发帖数: 8927
6
Costco Stretch-Tite is BPA free and is microwave safe.
http://www.stretchtite.com/faq.aspx
Also a lot of people recommended it here:
http://www.thekitchn.com/if-youre-going-to-use-plastic-139527
According to wikipedia:
http://en.wikipedia.org/wiki/Plastic_wrap
The PVC-based films contain plasticizers, most often bis(2-ethylhexyl)
adipate (DEHA), but phthalates (most often dibutyl phthalate (DBP) and bis(2
-ethylhexyl) phthalate (DEHP)), in spite of being prohibited in most
countries, also cause ... 阅读全帖
H***a
发帖数: 506
7
来自主题: SanFrancisco版 - 请问dublin的廉居房建在哪里?
左边那块地原来是计划建promenade,一个高档商业街,当时dublin ranch和sorrento
的开发商用这个来吸引买家。现在rezone成high density residential了,不是bmr。
(不过也有可能有一些%会是bmr units,dublin新建小区基本都有些bmr的要求,象我
们小区,101户,20家的floor plan要求有in-law unit,就是带厨房厕所的卧室,这是
市政府要求的,指望owner出租给低收入的,但是没有一家出租的,就当个master
suite带厨房在用。positano所有的小区都有这个要求,但真正出租给低收入的几乎没
有)
右边那一片是已经建好的dublin ranch the grove的未来phase用地,the grove本来就
是mix的high density住宅,过去几年已经建好一半都住了很多人了,完全建成后一共
有930 units,大概一半是affordable units,一半市场价卖。这一半affordable units
还包括322 senior apartments。这可能就是你同事说的1000... 阅读全帖
g****n
发帖数: 3313
8
URGENT: URGENT:
If you are residing in Cupertino Union School District or Fremont Union High
School District, this is extremely important to you!
Call to every one to attend the Cupertino City Council meeting tonight (Nov.
10) at 6:45pm City Hall Community Hall in Cupertino.
Cupertino city is evaluating a proposal of adding 4000 apartment units, if
this proposal is approved by the Cupertino City Council, both CUSD and FUHSD
Districts will be negatively impacted, resulting in bigger number of
stu... 阅读全帖
Q***N
发帖数: 2972
9
来自主题: SanFrancisco版 - 买房小白求建议
Gale Ranch那里的新房已经盖的很偏了, Windermere多少年没有批准新盖的住宅区了
。 商业区一般要大路, 那里大路的2侧都没有空地。 图中看到的空地基本上都是山或
者是沟。改Zoning是很麻烦的.
农业区<工业区<商业区 优先住宅的,Builder更挣钱。
t*****r
发帖数: 4431
10
来自主题: Seattle版 - 沁园春-雾
晚饭的时候看新闻,报道北京的天气恶劣,空气状况已经测不出来了(Air Pollution
in Beijing Goes Off the Index ).正好国内的朋友发过来这个幽默小文,一起分享。
ZT 雾锁中原
北京风光,千里朦胧,万里尘飘,望三环内外,浓雾莽莽,鸟巢上下,阴霾滔滔!车舞
长蛇,烟锁跑道,欲上六环把车飙,需晴日,将车身内外,尽心洗扫。空气如此糟糕,
引无数美女戴口罩,惜一罩掩面,白化妆了!唯露双眼,难判风骚。一代天骄,央视裤
衩,只见后座不见腰。尘入肺,有不要命者,还做早操。
BEIJING — People refused to venture outdoors and buildings disappeared into
Beijing's murky skyline on Sunday as the air quality in China's notoriously
polluted capital went off the index.
The Beijing Municipal Environmental Monitoring Center said o... 阅读全帖
c******t
发帖数: 1733
11
来自主题: Fitness版 - [bssd] 奔段视频
David whitley's CMS experience:
On December 4th, 2004 I competed in a Girevoy Sport meet and became the
first native-born American to achieve the rank of Candidate for Master of
Sports, or CMS. I did this by completing 71 reps in the Long Cycle Clean and
Jerk with two 24kg kettlebells in the 90kg + bodyweight category. In this
article I would like to share some of the tools and strategies I have used
for increasing numbers in GS.
Technique
When talking about GS, you are talking about technique. ... 阅读全帖
c******t
发帖数: 1733
12
来自主题: Fitness版 - [bssd] 奔段视频
David whitley's CMS experience:
On December 4th, 2004 I competed in a Girevoy Sport meet and became the
first native-born American to achieve the rank of Candidate for Master of
Sports, or CMS. I did this by completing 71 reps in the Long Cycle Clean and
Jerk with two 24kg kettlebells in the 90kg + bodyweight category. In this
article I would like to share some of the tools and strategies I have used
for increasing numbers in GS.
Technique
When talking about GS, you are talking about technique. ... 阅读全帖
e***s
发帖数: 1397
13
来自主题: GunsAndGears版 - Shotgun Home Defense Ammo 的选择问题
Summary: Best choice is 12GA pump shotgun, loaded with #1 buckshot.
http://www.firearmstactical.com/briefs10.htm
Shotgun Home Defense Ammunition
(Tactical Briefs #10, October 1998)
For home defense, a shotgun is superior to a handgun in terms of being able
to stop a violent intruder as quickly as possible. A reliable, well-made,
pump-action shotgun can usually be purchased for less than the cost of a
handgun of comparable quality. Also, inexpensive birdshot ammunition,
typically used for trainin... 阅读全帖
b******e
发帖数: 202
14
来自主题: loseweight版 - 所谓低GI食物, 多低算低?
south beach diet的作者是这样说的:
“You must bear in mind that the degree to which your blood sugar is raised
depends not just on the glycemic index of the food but also on the quantity.
For example, carrots have a high glycemic index, but they are fairly low in
carbohydrate density. Therefore, you'd have to eat several handfuls of
carrots to approximate the total rise in blood sugar you'd get from a single
slice of white bread.”
我的理解是胡萝卜虽然不如青菜叶子,但总比忍不住吃carbohydrate density高的东西
强些。
补充一点:芹菜貌似也是'dirty doze... 阅读全帖
j****y
发帖数: 1714
15
https://www.dietdoctor.com/science
The latest review of all major trials of low carb diets show improved weight
AND improvement of all major risk factors for heart disease:
Santos FL, et al. Systematic review and meta-analysis of clinical trials of
the effects of low carbohydrate diets on cardiovascular risk factors. Obes
Rev. 2012 Aug 21. doi: 10.1111/j.1467-789X.2012.01021.x. [Epub ahead of
print
http://onlinelibrary.wiley.com/doi/10.1111/j.1467-789X.2012.010
Keywords:
Low carbohydrate diet;me... 阅读全帖
s******i
发帖数: 260
16
最近做了体检,恶补了健保方面的知识,跟大家共享。文中知识均来自于我们的健保医
生,我们的医生朋友,American Heart Association (AHA) 美国心脏协会, Heart.org
, National Institutes of Health (NIH 国家卫生研究院,美国政府部门,网站,www
.nih.gov) , sparrow.org. 文章中如有英文或者英文缩略词,都用相应中文翻译。
本文没有涉及到具体的化学式,化学反应,生物机理等,具有初高中以上文化知识的都
能看懂,各位放心大胆的看。
好身体方案,写在最前:
无论什么原因造成身体的某项指标超标,以下各项都可以让你更健康:
(1)戒烟
(2)适度饮酒 (根据不同情况,有些人适度饮酒对身体有利,有些人必须戒酒)
(3)每天有氧运动30分钟,慢跑或者快走均可,每周运动5次以上
(4)避免久坐 学习/工作一小时一定要起身做舒展运动
(5)合理膳食 (本部分内容在本文最后)
重要的体检指标:
知识来源:http://www.heart.org/HEARTORG/Conditions/Cholesterol/Abo... 阅读全帖
O**********e
发帖数: 69
17
>> 152 的information manual起降数据都是结合温度按pressure altitude给的,是不是
>> 计算的时候还是只看Pressure altitude,再在表格里按温度找到对应的数据?
是的,152的手册用温度查,实际上隐含了Density Altitude,
你在听KRUT AWOS的天气预报的时候,可能会告诉你Density Altitude.
如果这个高度很高,你考虑作相应的处理。
>> 这个可能不好办。租来的飞机,距离目的地大概2个多小时。只有在中午附近起降。还
>> 有啥高招避开湍流?
沿着峡谷飞,比如US-7
>> 如果这时巧合空速表坏了,目视判断空速不就有大问题了?等到stall warning响了是
>> 不是太晚了?是通过visual clue,比如看机头和地平线的夹角么?如果是,山区的地
>> 形复杂,地平线未必找的到,该怎么办?
可以听发动机,
还有操纵灵敏度,反应迟钝就有失速危险,
stall warning的触发level也是和平时一样的。
除了眼睛看到的地速高,其它都是一样的。
p********r
发帖数: 1432
18
来自主题: Pilot版 - 172和152还是挺不一样
I'm debating to train on 152 or 172. It's very common to find a density
altitude of 6500+ or even 7000+ at field elevation in a normal summer day
here. Does 152 work for training purpose in this case? What happens if practice slow flight/stall etc at density altitude ~9000 in a 152?
b***i
发帖数: 10018
19
☆─────────────────────────────────────☆
vivil (running piggy) 于 (Fri Jun 10 15:59:50 2011, 美东) 提到:
我最近忽悠了几个local runner来做高精度骨结构扫描,看到一些有意思的结果。样本
很小,就4个(还加上我自己)。3个的trabecular bone (松质骨)结构和正常人有差异
,主要体现在有变粗变大的骨小梁,并且成片连接在一起。初步估计,在开始过长时间
,过大负荷的给予骨头Loading,unloading,造成了非常小的microfracture,
microdamage,恢复后就形成了microcallus(骨痂)。唯一一个跑完骨头一点事没有的
,当当当当,就是我们的兽人tonyprince同学。
下面按顺序是:1.vivil:我的只显示有很小的一点异常,在接近左下cortical bone(
硬质骨)的地方。
2. vivil+1,明显比我的问题要多。他头两次全马脚踝疼痛难忍,估计是有原因的。
3. simpleshue,最悲催的就是这位同学,scan结果刚出来吓... 阅读全帖
b***i
发帖数: 10018
20
来自主题: Running版 - interesting post: 生命在于运动
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
g*2
发帖数: 658
21
Overview of running injuries of the lower extremity
Author
Lisa R Callahan, MD Section Editor
Karl B Fields, MD Deputy Editor
Jonathan Grayzel, MD, FAAEM
All topics are updated as new evidence becomes available and our peer review
process is complete.
Literature review current through: Feb 2012. | This topic last updated: Oct
20, 2011.
INTRODUCTION — Running is one of the world’s most popular forms of
exercise, with millions of regular participants. In the United States alone,
up to 40 mil... 阅读全帖
h*********r
发帖数: 10182
22
来自主题: Tennis版 - 打网球真减肥
Biological effects on bone calcium and kidney health
Phosphoric acid, used in many soft drinks (primarily cola), has been
linked to lower bone density in epidemiological studies. For example, a
study[2] using dual-energy X-ray absorptiometry rather than a
questionnaire about breakage, provides reasonable evidence to support
the theory that drinking cola results in lower bone density. This study
was published in the American Journal of Clinical Nutrition. A total of
1672 women and 1148 men were s
a****n
发帖数: 4734
23
来自主题: Tennis版 - 正在学习求科普
http://www.tennis-warehouse.com/LC/BasicFacts.html
Basic Facts About Frames & Strings
Reprinted with permission of the United States Racquet Stringer's
Association
EDITOR'S NOTE: The following information was supplied by USRSA Technical
Advisor Steve Davis. When Steve's not technically advising the USRSA, he's
directing Research & Development for Prince Sports Group. We think it's safe
to say that Steve knows his basic racquet and string facts.
Note that these facts are presented as generalities... 阅读全帖
j*****z
发帖数: 5306
24
来自主题: TVGame版 - simcity大补丁终于出来了
4月22号发布
Fixes and Updates
? Cities not Processing: Mitigates some of the issues that were causing citi
es not to process. We are continuing to work on and improve this issue.
? Region Filters: Now sorts regions with available cities to the top
? Invitations: Invitations to join a region should be sent and received more
quickly.
? Tourism: Fixes for unexplained fluctuation of tourists. Tourists more smar
tly counted on transit.
- Cruise ships are now more effective at bringing medium and high wea... 阅读全帖
y*******5
发帖数: 5023
25
来自主题: BrainTeaser版 - 贡献两个智力题,攒RP ( QUALCOMM)
非常同意你对第二题的解答!
正好刚刚考过概率。
来冒昧的证明一下。
三个蛋[0,1]平均分布,density functions f(x)=1, f(y)=1, f(z)=1.
要求的是条件概率 (x>z | x>y) = (x>z and x>y)/(x>y)
三个蛋互相independent,所以联合 density function 如下,
f(x,y)=f(x)*f(y)=1, f(x,y,z)=f(x)*f(y)*f(z)=1
(x>y) = double integral: f(x,y)dydx, y from 0 to x, x from 0 to 1 = 1/2
(x>y and x>z) = triple integral: f(x,y,z)dzdydx, z from 0 to x, y from 0 to x, x
from 0 to 1 = 1/3
so (x>z | x>y)=(1/3)/(1/2)=2/3
不知道解释清楚没有,hoho。
o*******g
发帖数: 1300
26
来自主题: Collectibles版 - 为什么有人说这个是假的
I did some quick research and found out that Tungsten has almost identical
density as Gold, and should be cheaper since each light bulb contains
probably a fraction of grams. It seems to be the only non-exotic metal equal
to or heavier than gold. It will be very difficult to tell from density if
you get a fake coin which is gold plated tungsten.
However, given the extremely high melting point of tungsten (4000K), I don't
see a small shop can melt and cast tungsten easily. As a comparison,
platin
h****7
发帖数: 1405
27

I found the density of lead is 11.34g/cm-3,it is a little higher than the
density of silver 10.5g/cm-3. so if mixed with lead, it should be heavier.
w***g
发帖数: 734
28
来自主题: PhotoGear版 - 请教一个Lee GND的问题。
准备买个GND。去B&H上看着这两个。不知道有啥区别?
谢谢谢谢。。
LEE Filters 4x6" Combination Graduated 81EF with Neutral Density (ND) 0.6
Resin Filter - Hard Edge
LEE Filters 4x6" Combination Graduated 81EF to Neutral Density (ND) 0.6
Resin Filter - Hard Edge
p*******y
发帖数: 944
29
来自主题: PhotoGear版 - 俺对filter的目前了解
...not sure. OK, I give up due to my knowledge. Below is what Wiki says.
Sorry if my understanding is wrong.
=====================================================
A neutral density filter (ND filter) is a filter of uniform density which
attenuates light of all colors equally. It is used to allow a longer
exposure (to create blur) or larger aperture (for selective focus) than
required for correct exposure in the prevailing light conditions, without
changing the tonal balance of the photograph.
A
x****c
发帖数: 25662
30
☆─────────────────────────────────────☆
nbnb (nbnb) 于 (Thu Jan 6 01:49:11 2011, 美东) 提到:
以前基本没怎么用过,现在用P&S开始习惯了,发现这种模式相对容易估算。Matrix
Metering强大,但是很多时候不知道相机在想啥。是这么回事吗?
☆─────────────────────────────────────☆
daye520 (哈哈) 于 (Thu Jan 6 01:56:54 2011, 美东) 提到:
光照条件差别很大的场景,矩阵测光肯定会一部分过曝一部分欠曝的
☆─────────────────────────────────────☆
minivan (NEX) 于 (Thu Jan 6 01:58:02 2011, 美东) 提到:
俺这次顶着大太阳去滑雪 matrix基本都是准的 自己补偿纯粹是拖了裤子出气。。

☆─────────────────────────────────────☆
SEM (Slow Eye Movement)... 阅读全帖
a*********a
发帖数: 3656
31
来自主题: PhotoGear版 - 全幅 vs APS之大光圈人像比较
1. the pics you posted are so small, how can you tell single pixel level
quality from those?
2. why bigger pixel could have weaker low pass filter? that does not make
any sense. higher pixel density requires weaker low pass filter. If pixel
density is high enough, that is when the highest spatial frequency the best
lens can resolve was still much lower than the spatial frequenc of the pixel
array, one can elliminate the low pass filter.

Canon
t****t
发帖数: 2164
32
Hoya 77mm Neutral Density - ND - 8x Glass Filter NEW:
http://maxsaver.net/Hoya-77mm-Neutral-Density---ND---8x-Glass-F
GND soft edge什么时候用?
想求一套超广能用的GND和holder
t****g
发帖数: 35582
33
来自主题: PhotoGear版 - 小黑屋的无奈
Metro SD population density 712/sq mi
Metro Boston popluation density 947/sq mi
g********d
发帖数: 641
34
全副的sensor面积是残副的2倍多。若按照同样的像素密度,36/16 = 2.25
所以D800 vs D7000是同样的像素密度。
有D800用户反映机子需要经常上脚架,有人不解,认为D7000以同样的像素密度,
也没有需要经常上脚架。
我想过这个问题,就是pixel level sharpness是否完全决定于pixel density。
设想一下,如果我们做一块象大楼一样大的 sensor给一位巨人使用,像素密度和
D800的相同,假设巨型镜头的解析力一样,他能得到非常 sharp的图像吗?
结论是很难,因为相机在拍摄的期间是会震动的,假设大楼sensor的中心移动
0.01毫米,大楼sensor的边缘已经移动了好几个毫米,甚至好几个厘米了,而
在这种情况下,要想在边缘上得到pixel level sharp的图像是几乎不可能的。
除非这块大sensor的像素点非常大,比方说一个几平方厘米大的像素点,移动
个几毫米对每个像素点的感光不造成影响。
同样的道理,在拍摄中sensor的轻微移动,对图像的damage,在同样像素密
度下,大sensor受到的impact会比小senso... 阅读全帖
h******g
发帖数: 11250
35
来自主题: PhotoGear版 - [合集] 看上去很美的RX100
☆─────────────────────────────────────☆
egon (schiele) 于 (Wed Dec 26 12:41:49 2012, 美东) 提到:
最近RX100的hype很多, RX100的sensor面积是别的DC的2.6倍多, 又有f1.8的大光圈,
体积又小, 看起来确实很美. 很美的东西我就忍不住多看了几眼...
但看之前要插2句废话:
#废话warning
比较光线充足的条件下的base iso的画质是一件很无聊的事情. 在光学充足的时候,
现在的芯片技术可以做到FF和APS在同样base iso时成像画质差别不大. RX100和其他DC
芯片大小的比例关系大致相对于FF和APS的关系. 再考虑到LX7 的base iso是 80,
RX100是125, 在同样面积, 光学充足的情况下, LX7能容纳比RX100多60%左右的photon.
RX100的面积比LX7大个160%左右, 那么photon saturation总量RX100只比LX7多60%左
右. photon总量决定画质. 这个photon总量的差别比FF和... 阅读全帖
b******g
发帖数: 3616
36
偏振镜你要的那款最新的有纳米镀膜的就是楼上给出的那款
http://www.bhphotovideo.com/c/product/752975-REG/B_W_1066400_77
Amazon链接:
http://www.amazon.com/Kaesemann-Circular-Polarizer-Multi-Resist
BH和Amazon买都没问题。
至于你要的B+W减光镜,你得问清楚是否需要多层镀膜,因为这个多层和单层差价很大
的。个人觉得减光镜多层和单层差别不大,可以选单层的,但是得问你亲戚的意见了。
减10档的“单层镀膜”在这里:
B+W 77mm ND 3.0-1,000X with Single Coating (110)
http://www.amazon.com/77mm-3-0-1-000X-Single-Coating/dp/B003ZDH
10档多层:
B+W 77mm #110 Neutral Density 3.0-1,000X Multi Coated Glass Filter
http://www.amazon.com/Neutral-Density... 阅读全帖
s********e
发帖数: 11693
37
来自主题: PhotoGear版 - 寻求有关GND的推荐
Graduated Neutral Density Filters: Are They Relevant In The Digital Age?
http://www.shutterbug.com/content/graduated-neutral-density-fil
x**u
发帖数: 215
38
来自主题: PhotoGear版 - UV镜 求推荐
有两个镜头,一个需要82mm UV, 一个需要67mm UV
有以下3种选择, 英雄帮忙推荐一下, Thanks
Hoya 67mm Ultraviolet UV (C) Haze Multicoated Filter Mfr # A67UVC $
22.99
Hoya 82mm Ultraviolet UV (C) Haze Multicoated Filter Mfr #A82UVC $37.
98


Hoya 67mm Ultraviolet UV Haze HD (High Density) Digital Filter Mfr #
XHD67UV $69.99
Hoya 82mm Ultraviolet UV Haze HD (High Density) Digital Filter Mfr #
XHD82UV $73.95


B+W 67mm UV Haze MRC 010M Filter Mfr # 66-070236 $39.... 阅读全帖
t***0
发帖数: 380
39
“基本数据量就是原始raw每4个像素,sRAW保留2个像素的色彩值”
所以说没banning了?bing是要做average的。
至于第一个问题,完全取决于你对于“总体噪声”怎么定义的,没啥可讨论的。
如果你说“总体是指” total(SNR) / pixel count 的话,那么如果总体不变,per
pixel的也不变,因为这就是"per pixel"呀。
aps-c于FF根本无法决定噪音的,真正决定噪音的是pixel density。同样工艺下50MP
的FF噪声肯定比10MP的APS-C大,Canon自己都说了,5Ds的noise level跟7DII一个水
平,因为这俩货pixel density几乎一样呀,而且又是同一时期的产物。

大小
k*******1
发帖数: 526
40
来自主题: WaterWorld版 - 喷水高度为什么有物理限制?
OK,if Pi!=Pe,没问题啊,加到方程里不就行了么?用下面公式计算:
h=V^2/2g+(Pi-Pe)/density/g
V是初始水流速度
Pi是inlet水压
Pe是exit 最高点水压
density是水的密度
g是重力加速度

only you such an idiot can get.
d********e
发帖数: 2221
41
来自主题: WaterWorld版 - NJIT的仲兴被黑人劫杀
"我觉得"again.
VA population density 196.22/sq miles.
CA population density 235.68/sq miles.
Not that different.
"VA比加州纯朴"? why? I lived in both states but don't share the same
feeling.
S*********g
发帖数: 24893
42
【 以下文字转载自 Stock 讨论区 】
发信人: StephenKing (金博士), 信区: Stock
标 题: 向民族英雄包鹏程致敬!为民族英雄包鹏程欢呼!
发信站: BBS 未名空间站 (Wed Jun 3 20:54:21 2015, 美东)
Pengcheng Bao, Graduate Student
Pengcheng is a second year graduate student. He obtained his B.S. in physics
from Nankai Univeristy in China.
Project: Development of methodology for realistic modeling of heterogeneous
catalytic interfaces.
Tel: 310-206-3215
Email: [email protected]
/* */
PENGCHENG BAO
Education
and Awards
2009 –
NANKAI UNIVERSITY TIANJIN, CHINA... 阅读全帖
r****o
发帖数: 1950
43
e.g.,
f(x) is the probability density function
F(x) is the cumulative density function
o********l
发帖数: 12430
44
f(x) is the probability density function
capitalized f is the cumulative density function
O**o
发帖数: 2071
45
我惊了,我4岁半的闺女今天拿回家的不是她图颜色的画或者加减法。她今天白天学习
的是物理:
What makes something float or sink -
1. Volume
2. Density.
Volume means how much space
Density means how heavy
这不是选择题,这只是一个statement。可我怎么觉得不太对啊?东西服不服难道不是
仅由密度决定?跟体积无关啊。木头在水里浮,甭管多大多小它都浮啊不是么?
o******1
发帖数: 12177
46
no it is not. The expansion is accelerating because the Dark Energy, which
is the fundamental feature of spacetime and the source of expansion, stays
roughly the same density, while ordinary matters and dark matters both
dilute as the universe expands. The more it expands, the thinner the matters
and fields. Because the dark energy keeps the same density, it wins more
and more and have the universe accelerate and accelerate. Nothing can stop
this.
Google for the "Big Rip" theory for the universe... 阅读全帖
m**d
发帖数: 21441
47
【 以下文字转载自 Military 讨论区 】
发信人: wayofflying (小破熊), 信区: Military
标 题: 南京大学重大发现 揭露了转基因惊人秘密
发信站: BBS 未名空间站 (Sun Oct 2 23:46:36 2011, 美东)
南京大学张辰宇教授重大发现 “剑指”转基因食物安全(图)
在九月出版的《细胞研究》(Cell research)的一篇研究中,南京大学张辰宇教授课题
组展示了一项非常令人惊奇的发现——植物的微小核糖核酸(microRNA)可以通过日常
食物摄 取的方式进入人体血液和组织器官。并且,一旦进入体内,它们将通过调控人
体内靶基因表达的方式影响人体的生理功能,进而发挥生物学作用。该研究证明植物微
小核糖核酸可能是食物中的“第七种营养成分”(其他六种分别是水、蛋白质、脂肪
酸、碳水化合物、维他命和稀有元素)。
南大教授张辰宇作《21世纪生物科学与生物经济》讲座
原文地址
Exogenous plant MIR168a specifically targets mammalian LDLRAP1: evidence of
cross-... 阅读全帖
f********t
发帖数: 6999
48
【 以下文字转载自 Military 讨论区 】
发信人: wayofflying (小破熊), 信区: Military
标 题: 南京大学重大发现 揭露了转基因惊人秘密
发信站: BBS 未名空间站 (Sun Oct 2 23:46:36 2011, 美东)
南京大学张辰宇教授重大发现 “剑指”转基因食物安全(图)
在九月出版的《细胞研究》(Cell research)的一篇研究中,南京大学张辰宇教授课题
组展示了一项非常令人惊奇的发现——植物的微小核糖核酸(microRNA)可以通过日常
食物摄 取的方式进入人体血液和组织器官。并且,一旦进入体内,它们将通过调控人
体内靶基因表达的方式影响人体的生理功能,进而发挥生物学作用。该研究证明植物微
小核糖核酸可能是食物中的“第七种营养成分”(其他六种分别是水、蛋白质、脂肪
酸、碳水化合物、维他命和稀有元素)。
南大教授张辰宇作《21世纪生物科学与生物经济》讲座
原文地址
Exogenous plant MIR168a specifically targets mammalian LDLRAP1: evidence of
cross-... 阅读全帖
q**x
发帖数: 1636
49
Material Safety Data Sheet
Sulfuric Acid
ACC# 22350
Section 1 - Chemical Product and Company Identification
MSDS Name: Sulfuric Acid
Catalog Numbers: S71211SC, S71826, S79200, S80213, S80213-1, A298 212,
A298212, A300 212, A300 225LB, A300 500, A300 612GAL, A300 700LB, A300212,
A300225LB, A300500, A300612GAL, A300700LB, A300C 212, A300C212, A300C212001,
A300C212002, A300C212003, A300C212004, A300C212005, A300C212006,
A300C212007, A300C212008, A300C212009, A300C212010, A300C212LC, A300FP 500,
A30... 阅读全帖
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