v***s
发帖数: 16 | 1 right, motor is a low pass filter.
However, harmonic current will cause additonal loss, motor will
be very hot. So it is always required that feeding motor with
pure sinusoidal current.
anq, I suggest you either change the inverter to be a SPWM inverter,
or using a LC filter to filter the high order harmonic.
The first technique is more advanced. You need a high frequency sawtooth
carier wave to perform the PWM. Then the output voltage of the inverter
will contain no low order harmonic, you just |
|
B****W
发帖数: 100 | 2 paper help:
M. C. Wintersgill, J. J. Fontanella, S. G. Greenbaum, and K. J. Adamic, Brit
. Polym. J., 20, 195 (1988).
additonal details:
British Polymer Journal
Volume 20 Issue 3, Pages 195 - 198
请发pdf version到 p********[email protected]
thanks! 发完请回复本贴，包子答谢！ |
|
r********r
发帖数: 281 | 3 转贴的，请直接联系公司。
I am currently looking to fill 2 senior engineering roles at my company,
Echogen, which is an emerging clean tech start-up company, based in Akron
Ohio.
The first role is a Senior Systems Engineer, which would provide the
opportunity to be a technical team lead in a new product introduction
environment.
In additon, I am looking for a Senior Engineer to lead our Thermodynamic
Cycle Design Team. A little about the role is below.
I was hoping you might be interested in one of these rol... 阅读全帖 |
|
s********s
发帖数: 291 | 4 How much do you get paid in your state including bonus and additonal hours?
I am in Texas |
|
C*****D
发帖数: 1299 | 5 Support.
现版副，竞选版主。Bluebel will be a great additon for the 版面。 |
|
h********e
发帖数: 2823 | 6 Source:
http://www.fda.gov/MedicalDevices/DeviceRegulationandGuidance/H
How to Market Your Device
Please note: as of October 1, 2002, FDA charges fees for review of Premarket
Notification 510(k)s and Premarket Approvals
Introduction
Three Steps to Obtaining Marketing Clearance from CDRH
Classify Your Device
Selecting the Appropriate Marketing Application
Other Requirements Besides Marketing Clearance
In Vitro Diagnostic Devices
Introduction
One of the most difficult aspects of getting a medical... 阅读全帖 |
|
L*****r
发帖数: 722 | 7 You are right. Thank you. Can you specifiy the points, and how to improve?
Ther are some other problems in additon to communication deficiency. |
|
|
w*******y
发帖数: 60932 | 9 use the following link
Link:
http://btob.barnesandnoble.com/index.asp?r=1&btob=y
this will save you 11%
find the David Attenborough version of the "Life" BD (currently #1 best
seller in BD)
add to your cart at 41.99
apply coupon code GSA1020 at checkout for additonal 20% off (coupon only
good through 6/1)
item ships for free ... should be around or just under $30 in most cases
mine already shipped for just under $40 as the coupon code did not apply to
preorders but as of today (last day the coup |
|
w*******y
发帖数: 60932 | 10 This NEW code is good for one or all of the three... formula and Daipers
and wipes !!
It is good for an additonal 5% on formula, diapers and wipes... so stack it
up with
your subscribe and save discount.. and/or parents magazine code for up to
55% off
on Earth Best diapers and wipes.
It is only good for Earth Best...I have never seen a Earth Best formual code
..so this is
good find.. (if I do say so myself) getting formula by the 4 pack is the
best deal.
Link:
http://www.amazon.com/gp/feature |
|
|
w*******y
发帖数: 60932 | 12 Shortest model sight yet! This sight is smaller than the former N-cell
battery sight (511/551) and runs on a single 123 battery. It also has a
longer battery life than the N-cell style sights. With the new single
battery configuration, the XPS allows more rail space than ever, leaving
more room for rear iron sights or magnification. Smaller, lighter and
always fast; the XPS series is a great new additon.
* Single transverse 123 battery to reduce sight length
* Shortened base only requir... 阅读全帖 |
|
|
w*******y
发帖数: 60932 | 14 Link:
http://www.amazon.com/gp/product/B000Y9H09Q/sr=8-1/qid=1291914786/
I ordered 5 of these and total cost is below:
Item(s) Subtotal: $9.25
Shipping & Handling: $5.84
-----
Total Before Tax: $15.09
Estimated Tax To Be Collected: $0.00
Gift Certificate/Card Amount: $15.09
So this is cheaper than Amazon prime deal
One reviewer had a great idea to use these outside a sleeping bag for
additonal warmth.
|
|
w*******y
发帖数: 60932 | 15 Running Warehouse is having an awesome deal on Powerbar Gel Packs. Buy any
two 24 packs for $12.23 each. Save an additonal 15% by entering the code "
CP15" under team discounts (top right corner of main page under gift card
and above view cart). Free 2-day shipping and free return shipping. All in
this deal comes to $0.43 per gel pack which is far and away the best deal
on the web.
Link:
http://www.runningwarehouse.com/descpage-PBG24.html
(Note: once you enter the team discount code you can... 阅读全帖 |
|
|
|
|
w*******y
发帖数: 60932 | 19 The weekend at American Eagle Link:
http://www.ae.com
there is free shipping site wide thru sunday
All clearance merchandise is also 30% once added to the cart (no coupon code
needed) not sure when this ends.
Tomorrow Only November 13th take an additional 30% off site wide with coupon
code 29737641
If the 30% off clearance is still active it will be applied first and then
the 30% off site wide will apply after.
|
|
|
|
G*******s
发帖数: 10605 | 22 【 以下文字转载自 SmartShopper 俱乐部 】
发信人: GoRockets (火箭加油), 信区: SmartShopper
标 题: Big Value Gift Sets - Choose 2 for $12 at Walmart.com
发信站: BBS 未名空间站 (Sun Apr 1 15:34:08 2012, 美东)
Walmart offers Big Value Gift Sets - Choose 2 for $12. Shipping is $0.97.
Gift set includes:
* Olay Indulgent Spa at Home Gift Basket + Free Magazine
* Dove Clean Comfort Gift Pack + free Magazine SOLD OUT
* Gillette Men's Total Grooming Gift Set + Free Magazine
* The Best in Beauty Allure Award-Winners Gift... 阅读全帖 |
|
|
s*******l
发帖数: 4870 | 24 昨天和娃作数学
我女儿说：我们学校是这样这样教additon的，和kindergarten一样
你看你看，老师还让我们trace letter and number，和kindergarten一样
还说她想回以前的montessori，因为学校太easy了
她说的时候没有不高兴，就是陈述这个事实
我就说：那你去学校玩吧，回来妈妈教你，妈妈教的东西不easy，对吧？
她说：不能在学校玩的！！！
我说：学校的东西easy啊
她很激动：可是还是要做的！easy也不能玩！
我知道他们的数学和正常班是一样的，也就算了
那个英文简单到令人发指，在抄写句子，很简单的句子这个程度
读的书也是超级简单书
我想知道你们一年级在学什么呀？
我们想好了，下下礼拜去one-to-one家长会，问清楚，到底英文哪里不好，需要呆在
ESL，
如果老师说不出来，还是决定换出来算了。 |
|
