s**e
发帖数: 1834 | 1 I am a little confused about the difference between these 2 math symbols
"$\sim$" and "$\approx$".
To give an example, let f1(x) = x, and f2(x)=x + x^2, f3(x)=2x.
And we consider x-->0 only.
I think both expression "f1(x) \sim f2(x)" and "f1(x) \approx f2(x)" are
correct. But what about f1(x) vs f3(x)? Should we use "f1(x) \sim f3(x)" or
"f1(x) \approx f3(x)"? |
|
w*******y
发帖数: 60932 | 2 Link:
http://www.hpdealerinfo.com/images/custom/05 - Q1492 - Combined2 end-user formsG.pdf
Buy $50 PRE TAX worth of HP Photo paper at Staples (see QS for all eligble
packings of HP Photo)
Use $10/50 recycle bank coupon
pay $40 oop,
get back $36 in CHECK/PAYPAL rebates (limit 4 pack, you'll have to pay for a
5th pack priced $10.25 or higher)
then submit for $25 Gas GC as outlined in this thread
total oop approx $40 (plus tax), get back $61 in rebates and gas card value
(make approx $20 when smok... 阅读全帖 |
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c********g
发帖数: 174 | 3 我想要的物品:
BOS-AMS Aug 23 approx, Sep 1/2
单张面值:
return economy
可接受的价格(必须明码标价！):
850
物品新旧要求:
邮寄方式要求:
买卖双方谁承担邮寄损失(Required if not code only):
付款方式说明:
paypal/boa
其他补充说明:
广告的有效期:
4 days
物品来源:
你自己的
我的联系方式:
mitbbs id
二手交易风险自负！请自行验证是否合法和一手卡！: |
|
c********g
发帖数: 174 | 4 我想要的物品:
BOS-AMS Aug 23 approx, Sep 1/2
单张面值:
return economy
可接受的价格(必须明码标价！):
850
物品新旧要求:
邮寄方式要求:
买卖双方谁承担邮寄损失(Required if not code only):
付款方式说明:
paypal/boa
其他补充说明:
广告的有效期:
4 days
物品来源:
你自己的
我的联系方式:
mitbbs id
二手交易风险自负！请自行验证是否合法和一手卡！: |
|
j***a
发帖数: 10844 | 5 Approx. 240 Intersections w/o Traffic Lights; Obey 4-Way Stop Rules and
Drive with Caution.
As of 5:30AM, there are approximately 240 intersections without working
stoplights in Montgomery County. As a reminder, treat ALL intersections
without a working stoplight as a four-way stop.
-Allow extra time for your commute and plan on delays.
-Proceed with caution ONLY when traffic permits.
-Enter intersections only when it is safe to do so, using turn signals to
let other motorists know your inten... 阅读全帖 |
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v**i
发帖数: 50 | 6 It seems that $\approx$ is never used in these discussions of limits. When $
\lim f(x)=0$ and $\lim g(x)=0$, the meaning of $f(x)\sim g(x)$ is that
\lim_{x} f(x)/g(x)=1.
Thus you can write $f1(x)\sim f2(x)$, but neither $f1(x)\sim f3(x)$ nor $f2(
x)\sim f3(x)$. |
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B********e
发帖数: 10014 | 7 I use $f1\sim f2$ as well as $f1\sim f3$ although i use $\approx$ in calculu
s class sometime :)
$
f2( |
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f**s
发帖数: 968 | 9 Specifications
Type
Digital, AF/AE single-lens reflex, camera
Recording Media
CF Cards (Type I); Compatible with UDMA CF cards; SD, SDHC, and SDXC Memory
Cards
Image Format
Approx. 36 mm x 24mm (35mm Full-frame)
Compatible Lenses
Canon EF Lenses (excluding EF-S Lenses)
Lens Mount
Canon EF mount
Image Sensor
Type
High-sensitivity, high-resolution, large single-plate CMOS sensor
Pixels
Effective pixels: Approx. 22.3 megapixels
Total Pixels
Total pixels: 23.4 megapixels
Aspect Ratio
3:2 (Horizontal... 阅读全帖 |
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w*******y
发帖数: 60932 | 10 Sorry for any mistakes, this is my first post. Not sure if its a repost but
I tried searching and didn't see anything and don't know if its ymmv. I've
attached my receipt here. It didn't show the model on receipt but item #,
same as Officedepot.com. See link below.
I was searching for a new camera at Office Depot today and saw this. Price
listed for $199 with a clearance sign on top of it so I asked them what the
price was. He checked the price and told me $149. I was thinking it was a
pretty go... 阅读全帖 |
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D****e
发帖数: 1122 | 11 899 加元,这个价格不知道赤壁带够的人如何想
http://www.sonyalpharumors.com/sr5-rx100miii-priced-at-899-cana
摘要：
Optical Zoom : 2.9x (Optical Zoom during movie recording)
Lens Type : Carl Zeiss® Vario-Sonnar T*
Aperture (Max.) : F1.8(W)-2.8(T)
Viewfinder
Type : 0.39″ SVGA electronic viewfinder(OLED), 1,440,000dots
Magnification : Approx. 0.59x with 50mm lens at infinity, -1m1(diopter) (
35mm equiv.)
－－－－－－－－－
完整
Software
Operating System Compatibility : PlayMemories Home: Windows® XP SP3,
Windows Vista... 阅读全帖 |
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y*********e
发帖数: 7269 | 12 最牛的革命机了
亮点，比EM5改进的五轴防抖和AF
新的小范围AF，是革命机Contrast AF的一大突破，有望比Phase AF更小更精准。
Super Spot AF: Selectable from center of enlarge view(0.02% – 0.16% in
view image)
内置wifi功能结合smart phone，弥补了之前没有GPS，wireless shutter release的缺
陷，上传照片更方便。
唯一遗憾就是没有三防了。
http://www.43rumors.com/
Model name: E-P5
Product type: Micro Four Thirds interchangeable lens system camera
Memory : “SD Memory Card*1 (SDHC, SDXC, UHS-I compatible, Eye-Fi Card
compatible*2 )
*1: Class 6 or higher is recommended for Movie shooting.... 阅读全帖 |
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w*******y
发帖数: 60932 | 14 Apply coupon code DEALXH50 for $35 off
Link:
http://shop.panasonic.com/shop/model/SC-XH50
quote
Playable Discs
DVD DVD-Video
DVD-R/DVD-R DL/DVD-RW 1 DVD-Video
MP3 2 (DVD-R/DVD-RW)
JPEG (DVD-R/DVD-RW)
+R/+R(DL)/+RW 3 Video
CD CD-DA
VCD
SVCD
MP3 4
JPEG
CD-R/-RW 5 CD-DA
VCD
SVCD
MP3 6
JPEG
Audio System
Output Channel 5.1ch
Output Power: Home Theater Mode (RMS) Total Power: 300W
Front: 55W x 2 (1kHz, 5ohms, 10% THD)
Center... 阅读全帖 |
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i****o
发帖数: 1183 | 15 Full Spec:
Number of effective pixels: 16.3 million pixels
Image sensor: 23.6mm×15.6mm（APS-C）X-Trans CMOS with primary colorfilter
Sensor Cleaning system: Ultra Sonic Vibration
Storage media: SD memory card / SDHC memory card / SDXC(UHS-I) memory card
File format (still image): “JPEG (Exif Ver 2.3 *2), RAW (RAF format), RAW+
JPEG (Design rule for Camera File system compliant / DPOF-compatible)”
Movie format: H.264（MOV）with Stereo sound
Number of recorded pixels: “L：4896ｘ3264 4896ｘ2760 3264 ×3264... 阅读全帖 |
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w*******y
发帖数: 60932 | 16 Link:
http://www.frys.com/product/5975474
Control
* AF modes : Single-shot AF, Automatic AF, Continuous AF, (AF/MF selectable)
* Drive Mode : Single-shot, Continuous, Self-timer, Bracketong; Cont./ WB,
Remote Commander
* Exposure Compensation : ?2EV (in 1/3 EV steps)
* Exposure settings : Auto, Auto Flash Off, Program Auto (P), Aperture
priority (A), Shutter priority (S), Manual (M)
* Focus Area : Wide (Up to 9 active focus points), Spot, Local (9 local
areas selectable)
* Focus Features : Manua... 阅读全帖 |
|
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w*******y
发帖数: 60932 | 18 Must register for Panasonic Purchase Program!
1. Go to epp.panasonic.com (no www)
2. Click on Sign Up
3. Use group ID NXT777
4. Log in and get sweet discounts! Woot!
Inside the site, look under Audio>Home Theater Systems>SC-BT230
Price is $230 + tax with free shipping!
This system has a Blu-Ray player while the Wal-Mart and ShopOnkyo home
theater deals only have a DVD player. Great match for your new BF TV deal!
Solid 4-star ratings on Amazon:
Link:
http://www.amazon.com/Panasonic-SC-BT23... 阅读全帖 |
|
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k****r
发帖数: 9629 | 20 What foods are most likely to contain GMOs?
With regard to our North American
food supply, approximately 93% of soy, 88% of field corn, 94% cotton, and o
ver 90% of canola seed and sugar beets planted in the U.S. (2012 data) are g
enetically engineered.According to the Non-GMO Project, the following are co
nsidered High-Risk Crops (in commercial production; ingredients derived from
these must be tested every time prior to use in Non-GMO Project Verified pr
oducts (as of December 2011): ?Alfalfa ... 阅读全帖 |
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s*******e
发帖数: 1544 | 21 超市里应该都是转的。美国~90%玉米是转基因的。
玉米花粉可以传播几英里，所以就算没转的也很可能被污染成转的了。
whole foods 都没有有机新鲜玉米卖。估计是保证非转的成本太大。
普通超市更不用说了，算算概率就知道了
美国主要转基因作物：
Canola (approx. 90% of U.S. crop)
Corn (approx. 88% of U.S. crop in 2011)
Cotton (approx. 90% of U.S. crop in 2011)
Papaya (most of Hawaiian crop; approximately 988 acres)
Soy (approx. 94% of U.S. crop in 2011)
Sugar Beets (approx. 95% of U.S. crop in 2010)
Zucchini and Yellow Summer Squash (approx. 25,000 acres)
A |
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s******s
发帖数: 13035 | 22 你给whole foods拼命洗地，人自己都不敢这么说
＃＃＃＃
Does Whole Foods Market’s quality standards prohibit GMOs?
No. It’s impossible for us to include GMOs as a catch-all standard at this
time due to the lack of regulation or requirement to disclose their presence
in foods. Our quality standards for food prohibit the use of artificial
colorings, flavorings, preservatives, hydrogenated oils, high fructose corn
syrup and other specific ingredients.
＃＃＃＃
Do any products sold at Whole Foods Market contain GMOs?
Yes, as ... 阅读全帖 |
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l***2
发帖数: 486 | 23 谢谢大家上次帮鉴定了2家，现在对这3家（尤其第一家）比较满意，想听听大家的建议
。不胜感激！
1. 很满意这家，请帮帮提提建议。
唯一concern,家窗口的一棵树挺大，地基concern一点。
828 SAN PETRONIO STREET, Sunnyvale 94085 Status: Active MLS #:
81202713
Class: Single Family Residential List Price: $451,000 Original: 01/23/
2012
County: SANTA CLARA COUNTY Sale:
Complex: COE:
Beds: 3 Baths: 2 (2/0)
Approx SqFt: 1,326 (Assessor)
Approx Lot: 5,200 Sqft (Assessor) DOM: ... 阅读全帖 |
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s**l
发帖数: 11983 | 24 strongly recommend this project and its website:
http://www.nongmoproject.org/
GMOs, or “genetically modified organisms,” are plants or animals created
through the gene splicing techniques of biotechnology (also called genetic
engineering, or GE). This experimental technology merges DNA from different
species, creating unstable combinations of plant, animal, bacterial and
viral genes that cannot occur in nature or in traditional crossbreeding.
For consumers, it can be difficult to stay up-to-dat... 阅读全帖 |
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w*******y
发帖数: 60932 | 25 Newegg has the Panasonic Lumix DMC-ZS7 SILVER 12.1 MP 12X Optical Zoom for $
269AC SHIPPED today ONLY
One day sale on this great camera at Newegg with FREE SHIPPING!!! and most
likely NO TAX!!!!
Panasonic DMC-ZS7 Silver 12.1 MP 3.0" TFT(460K), AR Coating LCD 12X Optical
Zoom 25mm Wide Angle Digital Camera
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16830180323
use code: EMCZYNT99
and you probably have to sign up for their deals (free) to get this price)
Other colors are available ... 阅读全帖 |
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w*******y
发帖数: 60932 | 26 Oxo products are well designed and made to last. This is an 18pc storage set
for $19.90 plus tax (in some states) at of all places HSN.com.
LINKY:
http://kitchen-dining.hsn.com/oxo-good-grips-top-18-piece-cover
The closest comparable set I could find was at Amazon. Their 20pc set of OXO
top storage is $53.79. There is also a 12 pc set on Zappos for $29.99.
First time orders on HSN.com get free shipping by using promo code: C73458,
the get $20 off $40 code does not work on 3 sets of these, I trie... 阅读全帖 |
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y***m
发帖数: 7027 | 27 需要修理的地方 ：
The tearing out and replacement of two ceilings (the sun room approx. 14X8,
and the bathroom approx. 8X8) each open area will have its insulation
replaced before replacing of the drywall. Each area will then be taped
blocked and skimmed to be made ready for paint. Ceilings will be painted
back white.
sunroom和bathroom天花板大面积换掉
The skylight in the kitchen will repaired by having the needed drywall tape
tore out as well as small sections of drywall where needed, areas will
receive the s... 阅读全帖 |
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M********e
发帖数: 2528 | 28 我不知道你是从哪里来的概念，比如“超过3个月以上喂养的实验概不算数？”，比如
科学实验从来不test超过3个月什么的，你是否读过任何文章啊？
下面是引用的综述的文章。
http://www.sciencedirect.com/science/article/pii/S0278691511006
在table3里列了很多研究转基因玉米及其他对动物的影响。在这个就有好几年研究啊。
这些研究结果都没发现转基因比传统育种的更risky。
不过我觉得我的确太闲了。
Table 3.
Impact of GM plant diets in multigenerational studies.
Plant Trait Reference & Funding Species Duration Parameters
Group (n = number of individuals per group) Mai... 阅读全帖 |
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l******8
发帖数: 9475 | 29 20-60x Zoom Eyepiece
Nikon announced two new EDG fieldscopes with VR technology (world’s first).
They can be attached to a DSLR with an adapter - see this guest post for
more info.
Key features:
The world’s first fieldscopes featuring Nikon’s lens-shift type VR (
Vibration Reduction) system (as of October 2011)
It reduces vibrations to approximately 1/8*2 during observation,
providing the equivalent of a shutter speed approximately two stops*2 faster
in digiscoping
Easy VR operation;... 阅读全帖 |
|
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w*******y
发帖数: 60932 | 31 This is a good deal for those of you that don't want and/or need the 55-
300mm lens kit. If you definitely want that lens, then this is a good deal.
By the way, if you haven't heard this is a great entry to mid-level camera
that offers some serious bang for the buck including excellent low light
performance, 720p video and in-camera HDR processing. Check and compare at
dxomark.com:
http://www.dxomark.com/index.php/en/Camera-Sensor/Compare-senso
. DPReview:
http://www.dpreview.com/reviews/pent... 阅读全帖 |
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x****y
发帖数: 22 | 32 刚bid到一个湾区的房子，准备全面重新装修，请agent推荐的师傅报价了一下，有经验
的朋友看看会不会哪高了。 第一个价格是material，第二个价格是人工。
师傅说是能保修5年。我感觉就是地板的报价还听合理的，给我算的6块钱每ft复合地板
包工包料，但洗手间总体感觉挺贵的，但说不上来哪贵了
DESCRIPTION QTY MATERIAL LABOR REMARKS
Master Bathroom
Remove all bathroom fixture & floor & dispose all debris $120 $
600
* we will check space next to shower pan if possible to remove 1 feet
space to enlarge shower area
Move shower drain and water supply $240 $560... 阅读全帖 |
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i*****e
发帖数: 6614 | 33 Take Green- B Line - Government Center To Government Center Station view
route
Approx. 5:13 AM Depart from Boston College Station - Inbound
Approx. 5:47 AM Arrive at Government Center Station - Green Line E
Take Blue Line - Wonderland To Airport Station view route
Approx. 5:56 AM Depart from Government Ctr Station - to Wonderland
Approx. 6:04 AM Arrive at Airport Station - Outbound
看起来比较紧张。。 |
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P****9
发帖数: 2294 | 34 2011 Connecticut Fireworks
Updated: Friday, 01 Jul 2011, 11:07 AM EDT
(WTNH) - Here's an updated list of fireworks in Connecticut for Independence
Day celebrations for 2011. We will update this page as we get additional
events listed.
July 1st (Friday)
•Dayville -- Owen Bell Park at 9:15 p.m.
•Derby -- (Rain Date July 2nd) [Link]
•Hamden -- (Rain Date July 2nd - US Army field Band will still perform
Fri. regardless of weather) [Link]
•Meriden -- Westfield Meriden Mall at ... 阅读全帖 |
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s***x
发帖数: 14 | 35 别胡扯了，美国的癌症和全世界癌症比例比这个低多了，分别只有0.25%和0.18% 比上
海小4到五倍，这里面还有很多是因为黑人的癌症的，去掉黑人，比例更少
别自欺欺人了，三分之一死于所得的癌症和三人之一得癌症是完全不同的概念，会不会
英语？
中国为什么那么多癌症，就是因为像你这样自以为是的，中国污染最严重生活最烂，怎
么可能癌症比别人低，用脑子想想
Approx. 0.25% in the USA (about 759,562 out of 303,824,640 people) Approx. 0
.18% worldwide (about 12,000,000 out of 6,706,993,000 people)
Total new cases for 2008=1,437,180--that is just in the USA. Approx. 1/3
will die from it. The American Cancer Society estimates that there are 12,
000,000 (12 million) cases worldwide.... 阅读全帖 |
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t******y
发帖数: 5040 | 36 http://www.antennalaunchers.com/csv19/index.html
Model TBL-CSV19 Antenna Launcher Specifications
* Overall Length: approximately 19 inches.
* Weight: approximately 6.5 pounds.
* Barrel: 16 inches by 2.5 inches, Tennis Ball size.
* Chamber: 8" by 4" dia = 100 cu in (approx 1.5 liters)
* Valve: 1" sprinkler valve, modified for pneumatic actuation - no
batteries required.
* Pressure Rating: materials rated to minimum 120 psi working pressure.
PVC Pipe rated to at least 200 p... 阅读全帖 |
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d*****0
发帖数: 68029 | 37 The maximum burst during continuous shooting is as follows:
JPEG Large: Approx: TBA
UDMA CF Card: Approx: TBA
RAW: Approx: TBA
UDMA 7 CF Card: Approx. TBA |
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o*******6
发帖数: 6113 | 38 我觉得这个还是个Taylor展开的问题
2^16=65536
7/6.55 \approx 1.07
2^10=(1+0.024)*10^3
所以
2^30 \approx (1+0.072)*10^9
2^46 \approx 65536*1.072*10^9 \approx 7*10^13
不知道46是不是最小的
谁能给个找最小的满足条件的指数的方法？ |
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c********g
发帖数: 1173 | 39 前些天彻底凑齐了这个小舰队，也来捞几个包子。
很喜欢G3，对我来说是个不错的size/image quality的平衡点。我今年的goal就是多照
照片，有了它就方便多了。另外，45mm真是不错啊，照人像很出色。我在下面再发两张
。
G3:
Dimensions (WxHxD) 3.29 x 4.54 x 1.84" / 8.36 x 11.53 x 4.67 cm
Weight 11.85 oz / 336 g Body only
20mm/1.7:
Filter Thread 46 mm
Dimensions (DxL) Approx. 2.48 x 1.81" (6.30 x 4.60 cm)
Weight 3.5 oz (99 g)
14-45mm:
Filter Thread 52 mm
Dimensions (DxL) Approx. 2.36 x 2.36" (5.99 x 5.99 cm)
Weight 6.88 oz (195 g)
45-200mm:
Filter Thread 52 mm
Dimensions (DxL) Approx. 2.7... 阅读全帖 |
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q***n
发帖数: 3594 | 40 rx1r2的zoom：
CLEAR IMAGE ZOOM
[Still Image] 2x, [Movie] 2x
DIGITAL ZOOM
[Still Image] 42M approx. 4x/18M approx. 6.2x/11M approx. 8x, [Movie] Approx
. 4x
150 |
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n****e
发帖数: 629 | 41 For first order approximation, f(k) = k
Second order approximation, f(k) - f(k-1) = 1 - f(k-1)/N
Sum up from k=1 to k=i, we have:
f(i) = i - 1/N*[f(1)+f(2)+...+f(i-1)]
Use the first order approx on the right hand side
f(i)\approx i - i(i-1)/N/2
for i=25, N=365
f(i) \approx 25 - 25*24/365/2 \approx 24.2
所以24个人的答案大概是对的 |
|
s*********e
发帖数: 1051 | 42 below was posted on my blog before and hope it helpful.
/************************************************
* ARMA - GARCH ESTIMATION USING PROC MODEL *
************************************************/
data garch;
lu = 0;
lh = 0;
ly = 0;
do i = 1 to 1000;
h = 0.3 + 0.4 * lu ** 2 + 0.5 * lh;
u = sqrt(h) * rannor(1);
y = 1 + 0.6 * (ly - 1) + u - 0.7 * lu;
lu = u;
lh = h;
ly = y;
output;
end;
run;
proc model data = garch;
parms ar1 ma1 mu;
y = mu + ar1 ... 阅读全帖 |
|
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m********g
发帖数: 10469 | 44 就这JB样还出来大选
Rhode Island Poll: 90% of Female Voters Reject Senator Ted Cruz…
Posted on April 24, 2016
https://theconservativetreehouse.com/2016/04/24/rhode-island-po
female-voters-reject-senator-ted-cruz/
For the past several weeks Senator Ted Cruz has been running a presidential
campaign based on a strategy to ‘win despite the voters’. The latest
Brown University poll (full pdf below) of Rhode Island voters highlights why.
The Brown U Poll shows Donald Trump with a lead of 38%, Governor Kasich
... 阅读全帖 |
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d******e
发帖数: 7844 | 45 我感觉MB，BMW \geq Audi \geq Lexus, Caddy \geq Infiniti \geq Acura \approx
Volvo \
approx Buick \approx Lincoln |
|
p******m
发帖数: 300 | 46
上网找到这个链接网站卖
http://www.mdcrabbers.com/Female_Crabs_s/31.htm
里面有好几个选择，请问是什么意思啊
Half Bushel of Female Crabs
Full Bushel of Female Crabs
==============================================
【1】Dozen Female Crabs 5-1/4" to 6.5"
Our Price: $44.99
【2】Half Bushel of Medium Female Crabs
Half a Bushel of Female crabs (5-1/4 to 6" Size) Approx. 3 to 3.5 dozen
Our Price: $84.99
【3】Half Bushel of Large Female Crabs
Half a Bushel of Fema... 阅读全帖 |
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C********n
发帖数: 6682 | 48 还是看wiki的table吧
http://en.wikipedia.org/wiki/Sound_pressure#Examples_of_sound_pressure_and_sound_pressure_levels
Shockwave (distorted sound waves > 1 atm; waveform valleys are clipped at
zero pressure) >101,325 Pa >194 dB
Theoretical limit for undistorted sound at 1 atmosphere environmental
pressure 101,325 Pa ~194.094 dB
Theoretical limit based on Atmospheric pressure records, Min & Max western
Pacific Ocean 1979 (Typhoon Tip) & Agata, U.S.S.R. 1968 87,000 - 108,
400 Pa ... 阅读全帖 |
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l*****n
发帖数: 14 | 49 3 bedroom, 2 full bath condo available now for rent in the desirable area of
Greenbriar in Greenbelt, MD, on
UMD shuttle route, great for young professionals or graduate students
- Quiet and parklike setting
- Close to NASA Goddard Flight Center, and the University of Maryland in
College Park
- 1300 sq ft, new paint, new carpet
- Full size washer and dryer in unit
- Water, electric, and gas included in monthly rental price
- Separate breakfast room area, in addition to dining room
- Balcony off ... 阅读全帖 |
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