h*****h
发帖数: 5 | 1 不是搞高分子的，跟着paper做SI-ATRP聚合copolymer。两种单体分别含有MEHQ和
hydroquinone monomethyl ether做inhibitor。只用一种单体的时候不除inhibitor都
可以聚合，可是共聚合死活不行。请问这个与inhibitor有关系么？谢谢各位达人～～
～ |
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g*******8
发帖数: 30 | 2 我用Grubbs catalyst (含两个溴砒啶那种，从Aldrich买的）作Norbornene的聚合(
ROMP),完全重复文献的步骤(Angew Chem Int Ed 2003, 42, 1743).
反应过程一切正常，每5分钟做一次GPC监测,总共30分钟，分散度(PDI)还好，在1.1-1.
2上下。
问题是：在我加入Ethyl Vinyl Ether淬灭反应后，马上将溶液(用滴管)加到过量甲醇
中沉淀，以纯化所得高分子。总共沉淀了两次。之后抽干残余溶剂.这时候再做GPC，分
散度(PDI)竟然涨到2以上，GPC的峰值也下降了，即分子量也下降了。
请问到底是什么原因？是残余的催化剂将分子链切断了？可我是完全照文献重复的呀。
跪求高手赐教！ |
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g*******8
发帖数: 30 | 3 来自主题: Macromolecules版 - 温敏性高分子 poly(oligo - ethylene glycol) methyl ether methacrylate or acrylate |
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z*******o
发帖数: 136 | 4 PEG-OH与萘钾反应后引发styrene oxide的聚合，还加了些crown ether， 之后用HCL终
止反应。过滤掉无机后在石油醚里沉淀copolymer，结果发现石油醚底部形成了淡黄色
胶状产物。
GPC显示分子量比PEG增加了，但是低分子量处有个小峰。分析原因是不是因为胶状产物
里包裹了溶剂和homopolymer在里面？我觉得EO45-SO10应该是白色固体，如何才能把胶
状物变成白色固体呢？
文献报道说黄色可能是行程了O-K+的离子对，用稀盐酸可以洗去，但是我试了还是没洗
掉。
恳请有类似经验的人指导一下 |
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J*R
发帖数: 187 | 6 One postdoctoral research associate position is available from Oct 1 or
earlier. The successful candidate will work on one of the following topics
depending on his/her background and expertise: novel morphing structures
using smart materials, mechanics of morphogenesis in embryos, fast motion of
plants (e.g., the Venus flytrap's rapid closure), and mechanical
instability of thin structures (e.g., DNA, plant tendrils, self-assembly of
nanostructures, etc.). The candidate should have received (or ... 阅读全帖 |
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k**e
发帖数: 2728 | 7 Form 344, 345 should be submitted together with form 186, so even though BMU
doesn't need to do anything with 344 and 345, they need to be sent back tog
ether with 186 due to that reason.
For transcript and diploma, BMU processed them usually only by re-stamping y
our old ones (that is, the transcript and diploma you received from them bef
ore you came abroad). It would be another additional procedure to do if you
did not provide BMU with copies of your transcript and diploma. |
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r******s
发帖数: 3662 | 8 小弟不才，摸索着做这破玩意也快两年了，可是每次做出来的particle分散性时好时不
好，surfactant用
的是oleic acid，在phenyl ether中需要加热到200度。清洗是用酒精和正己烷hexane
反复洗三次，洗完
之后有时能分散进非极性溶剂比如说甲苯,有的能分散进极性溶剂比如说丙酮，有时候
啥也分散不进去。
跟别人讨论有的说洗的太多了把surfactant都洗掉了，也看有的人做的时候最后洗完再
加一滴oleic acid
然后加1:3 hexane/methanol摇匀后去掉上清液再分撒，这招也是时灵时不灵，有时候
能分散很好，有
时候进TEM看还是一团粘在一起的。
在此不惜散尽家产请求各位大牛帮助，有帮助的给建议的双簧包，有帮助的十个大包子
，谢谢各位了。 |
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y******7
发帖数: 17 | 9 ----------
我回到家一般是4：00－4：30，然后别的什么都不做，开始写meds，背
meds，写care plan，11：30能写完就算顺利的一天，我睡6小时，她减去路上两小时，
家里还有三个孩子要照顾，睡2小时很resonable
----------
Many people are in her situation. One third of my classmates including me
have two or three children. 12 month accelerated program is supposed to be
tougher then traditional one. We also have to drive one or even more hours
to some hospitals. "睡2小时很resonable"???---she might ended up as a pt in
hospital instead of being a nurse.
You and Your classmate would better ... 阅读全帖 |
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a***g
发帖数: 64 | 10 It should not be diffult ether. We do had a postdoc who got her Ph.D from UK
. Very soon she found a job. |
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c****e
发帖数: 2097 | 11 Define ether, you can't do so correctly
Dark matter is matter
Thinking isn't intrinsically intelligent, phrases aren't necessarily
meaningful, stop saying nonsense
我觉得是。当然，过去对以太的理解是不对的：整个宇宙空间铁板一块。那种理解原自
classical mechanics：rigid body classical mechanics........
★ Sent from iPhone App: iReader Mitbbs 3.8 - iPhone Lite |
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k*********g
发帖数: 791 | 12 磁单极不是太少，理论上就根本不存在，不知道大家为啥这么迷信dirac？
mm实验没有测到以太风，上因为对“以太的性质”的猜测错了，
ether这东西上，在地球表面附近，跟地球的相对速度为零，这个有一点点流体力学的
知识就能猜到了，流体力学的边界层理论说的就是这个；
所以，在地球表面光各向同性，跟地球自传无关。mm实验怎可能测以太？
暗物质当然是存在的，现在想通过已经粒子那样的interaction来测试它，这个很难说
了。我的猜测是，这样测不到的， |
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C********n
发帖数: 6682 | 13 o
Einstein also didn't believe in Ether theory.
So ?
did
pole' |
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z**********g
发帖数: 16 | 14 继续发表有关斥力子的文章，请指正。
“斥力子理论”对物理学的影响1
庄一龙
近年来，由中国学者创立的“斥力子理论”，经过中国科学院《科技促进发展》《
科技成果管理与研究》、《科技中国》、《中国科技财富》、《中国科技成果》等主流
科技杂志报导后，引起了学术界广泛重视。那么，这一理论究竟有那些观点震动了学术
界，值得人们如此关注呢？
“斥力子理论” 是一种新物质作用理论，实际上也是一种物理哲学理论。它的代
表性文章是《论“斥力子”的存在及其意义》，另外还包括《相对性效应和牛顿定律的
本质》、《物理学中精细结构常数的理论推导与解释》等几十篇论文。同牛顿的苹果从
树上掉下来的万有引力理论相对应，这是一个可称作“苹果如何转移到树上去的‘万有
斥力’理论”。该理论认为，地面的物体一旦动起来，不管方向如何，都具有一种挣脱
地球引力的能力，就好象物体吸收了一种对抗万有引力的物质那样。“斥力子理论”把
普朗克能量子看作是一种对抗引力的实物粒子，称它为“斥力子”，并认为物体运动状
态的改变就是由于吸收或释放斥力子造成的。
在思维方法上，它有两个根本突破：其一,是把抽象的能量概念实物化，使能量有
一个实物载... 阅读全帖 |
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l***y
发帖数: 1166 | 15 特斯拉的引力动态理论
翻译很差劲，将就着看吧
The Dynamic Theory of Gravity of Dr. Nikola Tesla explains the relation
between gravitation and electromagnetic force as a unified field theory (a
model over matter, the aether, and energy). It is a unified field theory to
unify all the fundamental forces (such as the force between all masses) and
particle responses into a single theoretical framework.
尼古拉·特斯拉博士的《引力动态理论》解释了万有引力和电磁力之间统一关系的一个
理论（一个关于物质、以太和能量的模式）。它是一个统一场理论，把所有基本的力统
一起来（例如是所有物质之间的力）和粒子的反作用力，形成一个单一的理论框架。
Introd... 阅读全帖 |
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l***y
发帖数: 1166 | 16 Dynamic theory of gravity
引力的动态理论
Tesla published a prepared statement on his 81st birthday (July 10, 1937)
critiquing Albert Einstein's theory of relativity. The following is a
portion of that statement:
特斯拉在他81岁生日的时候（1937年6月10日）准备了一份发表声明，批评爱因斯坦的
相对论。以下是发表声明的一部分：
"... Supposing that the bodies act upon the surrounding space causing
curving of the same, it appears to my simple mind that the curved spaces
must react on the bodies, and producing the opposite effects, straightening
out the curves. ... 阅读全帖 |
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l***y
发帖数: 1166 | 17 Tesla's aether concept
特斯拉的以太概念
It is important to correctly comprehend Tesla's unique aether concept as
several popular researchers in the field have not done. Tesla's aether is
analogous to the classical aether "gas" theory.
正确地理解特斯拉独特的以太概念是重要的，因为几位流行的研究者都没有做过这个领
域的研究。特斯拉的以太是类似于古典的以太“气体”理论。
"Long ago he recognized that all perceptible matter comes from a primary
substance, or tenuity beyond conception, filling all space, the Akasha or
luminiferous ether, acted upon by the life giving Prana or ... 阅读全帖 |
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l***y
发帖数: 1166 | 18 Einstein and relativity
爱因斯坦和相对论
As an alternative to Einstein's general relativity (the original relativity
theory came from R. Boscovich, [1711-1787]), the Dynamic Theory of Gravity
explained the fields of gravity through electrodynamics. Tesla stated that
there was no energy in matter other than that received from its environment:
he did not accept the mass-energy equivalence as delineated by special
relativity. Tesla rejected this concept from Einstein, as the special
relativity theory's pri... 阅读全帖 |
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c****u
发帖数: 584 | 19
Petroleum Ether. I am not sure of the spelling. That is nothing but
mixture of hydrocarbon. They are labeled by boing points.
I will never try to put them in my mouth.//hehe |
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c****u
发帖数: 584 | 20
1st: Most of them are not "clean" enough, they may have some poisonus
impurity, I don't know if there are some kinds using for food product.
2nd: Even they are clean, they are mixture of decane, dodecane...I am not
sure, they are not good for health, although not poisonous. At least they
will dissolve the fat. However they are easy to be evaporated.
you can check the CRC safty handbook about petroleum ether. |
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j**i
发帖数: 419 | 21
a little bit,not very.
more expensive than petroleum ether(shi You mi)
-mixed alkanes from SHI YOU
,but still not expensive bah.
you can find its industry price.
I am not very clear here.
if in china ,I know how to search.:) |
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j**i
发帖数: 419 | 22 in china,there are three kinds of petroleum ether:
30-60 OC
60-90
90-120
their boiling point is not the same lah.
But as we know they are mixtures so they are not pure.
Generally when we use it we need to distill it.
They may contaim some aromatic compounds such as benzene etc.
Generally they are very easy to evaprate especially the first two kings.
sometimes people prefer the hexane or cyclohexane for these two solvents have
similiar characters as PE but they are more pure.
Alcohol is more pola |
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f**d
发帖数: 768 | 23 这是一本计算神经科学的优秀著作，全文拷贝这里（图和公式缺），有兴趣的同学可以
阅读
如需要，我可以分享PDF文件（－－仅供个人学习，无商业用途）
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖 |
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B*********8
发帖数: 207 | 24 到腰下的veil:
Walking length veil with a clear comb, used once (for several hours). In
perfect condition.
high quality veil, maintain its shape and position well once set. 比较硬
的纱，适合凹造型. 婚礼前提前两天拿出来挂着，就不会有在包装里的折痕了。
Two layers of raw edge tulle create an ethereal, romantic bridal look.
Top tier measures 26.5" long. Bottom tier measures 42" long. 50" wide.
ask for $20+ postage (实报实销), accept paypal (non cc) or check in the mail.
拖地的:
veil with a clear comb (same with the fist one), n... 阅读全帖 |
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h*********2
发帖数: 3 | 25 这个不用多说，自己看吧，SIZE 0P
http://www.anntaylor.com/ann/product/AT-Weddings-Events/AT-Wedd
Intricate lace is delicately gathered and shirred for an ultra-feminine
ethereal silhouette, complete with a flowy floor-length sweep skirt.
Strapless. Hidden side zipper with hook-and-eye closure. 44” from natural
waist.
ANN TAYLOR 2012年的新款。实物比照片惊艳，又非常端庄大方。上个月买的，USD895+
TAX，穿了1个小时，教堂婚礼，配了一个IVORY头纱，很赞。我身材小，平时也穿ANN
TAYLOR的0P号，这件婚纱正好，不用改，所以就LAST MINUTE买了，结果是THE DRESS！
婚礼后收好，纠结了一阵，经历了辛辛苦苦挑选婚纱和配饰的过程，最后决定转让给需
要的MM吧，US... 阅读全帖 |
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l*******s
发帖数: 7316 | 26 我把Linksys WRT1900AC刷了openwrt。
按larry（土哥）的提示装了通过SSH以下软件：
opkg update
opkg install usb-modeswitch kmod-usb-net kmod-usb-net-cdc-ether usbutils
udev
但不知道还需要怎么设置。openwrt的界面真是太简陋了。
另外hotspot上需要改什么设置吗？ |
|
l*******s
发帖数: 7316 | 27 搞好了。要断电重启。我原来是在luic点reboot重启的。
现在每次都是1405了。
也就是说， usb-modeswitch在开始的时候不要装。
装下面这些（如果原来没有的话）
kmod-usb-net kmod-usb-net-cdc-ether usbutils udev
kmod-scsi-core kmod-usb-storage
如果有下面的软件，就删掉
kmod-usb-net-rndis，usb-modeswitch
添加usb interface， 选dhcp client，在firewall settings里，点wan就全搞定了。 |
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l*******s
发帖数: 7316 | 30 按我给的教程搞USB modem模式，不难。
http://www.mitbbs.com/article_t/CellularPlan/53919.html
USB modem模式是比较理想的模式， 接好后跟普通接cable的路由器一样。两个频率的
wifi（2.4和5Ghz）有线都可以接入。而且不降低网速。
虽然网上有OpenWRT, DD-WRT, Tomato等固件的路由器接USB modem的帖子，但我试验成
功的只有OpenWRT。所以把OpenWRT用USB modem接zte pocket wifi的方法说一下。
第0步：如果你的路由器不是OpenWRT固件，去网上查一下能不能刷成OpenWRT固件，如
果能，按网上教程刷、如果不能，就另想办法吧。
如果已经是OpenWRT固件就按一下步骤设置：
第1步：将电脑用网线连到路由器的一个内网接口。打开浏览器，进入OpenWRT的luci界
面（缺省地址192.168.1.1）。可以根据需要修改lan的IP，要避开前面的router或
modem的lan 范围。我选用192.168.200.1, 避开一般路由器的192.168.... 阅读全帖 |
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l*******s
发帖数: 7316 | 31 按我给的教程搞USB modem模式，不难。
http://www.mitbbs.com/article_t/CellularPlan/53919.html
USB modem模式是比较理想的模式， 接好后跟普通接cable的路由器一样。两个频率的
wifi（2.4和5Ghz）有线都可以接入。而且不降低网速。
虽然网上有OpenWRT, DD-WRT, Tomato等固件的路由器接USB modem的帖子，但我试验成
功的只有OpenWRT。所以把OpenWRT用USB modem接zte pocket wifi的方法说一下。
第0步：如果你的路由器不是OpenWRT固件，去网上查一下能不能刷成OpenWRT固件，如
果能，按网上教程刷、如果不能，就另想办法吧。
如果已经是OpenWRT固件就按一下步骤设置：
第1步：将电脑用网线连到路由器的一个内网接口。打开浏览器，进入OpenWRT的luci界
面（缺省地址192.168.1.1）。可以根据需要修改lan的IP，要避开前面的router或
modem的lan 范围。我选用192.168.200.1, 避开一般路由器的192.168.... 阅读全帖 |
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w*******y
发帖数: 60932 | 33 I received an email with an awesome price for Puros Indios SDO Cigars from
Cigars International. Most people that enjoy cigars know the great quality
and taste of Rolando Reyes' cigars.
Here is CI's description:
"This weekend, we shine the ethereal CI Spotlight upon the fruits of a
storied Honduran operation - Rolando Reyes's Puros Indios factory. 4-year
aged gems at dirt cheap prices. Puros Indios SDO is yours starting at just $
15 per mazo of 20. An epic blowout, while supplies last.
In ear... 阅读全帖 |
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w*******y
发帖数: 60932 | 36 Spotted this today...
Link:
http://www.sears.com/shc/s/p_10153_12605_05757509000P?prdNo=21&
JVC KDPKR3002 - CD Receiver with 2 pair of 6.5" Speakers
Available Online or In-Store Pickup
Product Description
Jam to your favorite tunes with this package that includes a full feature cd
receiver and 2 pair of 6.5" speakers.
Variable Color Illumination
Front Aux-in
Wireless Remote Control
MP3/WMA Compatible
20 Watts RMS x 4 (MOS-FET) 50W x 4 MAX
Line Output RCA (2.5V) Selectable Rear/Subwoofer Output
3... 阅读全帖 |
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p****y
发帖数: 23737 | 37 〈數學是發明還是發現？〉
◎文╱利維歐（Mario Livio）▌譯╱翁秉仁▌提供/科學人
大多數人認為數學有用是理所當然，像是科學家以數學公式來描述次原子事件、工程師
用數學計算太空船的路徑。我們接受最先由伽利略倡議的觀點：數學是科學的語言，其
文法可以解釋實驗結果，甚至預測奇特的現象。數學驚人的威力處處可見，譬如蘇格蘭
物理學家馬克士威（James Clark Maxwell）的著名方程組，他的四個算式不只總結了1
860年代所有已知的電磁現象，並且預示了無線電波的存在，比德國物理學家赫茲（Hei
nrich Hertz）偵測到它還早了20年。極少語言這麼有效率，能將具有價值的眾多材料，
如此簡潔、精確又清楚地表達出來。愛因斯坦曾反思說：「數學做為人類思想的產物，
獨立於經驗之外，怎麼可能和現實世界配合得如此天衣無縫？」
身為一位理論天文物理學家，我在每一個工作環節都會遇到「數學不合理的有效性」（
unreasonable effectiveness of mathematics），這是1960年諾貝爾物理獎得主魏格納
（Eugene Wigner）的用語。不論我是在研究哪些前身恆... 阅读全帖 |
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G*******s
发帖数: 4956 | 39 http://www.godwithus.cn/wiki/HC01
海德堡要理问答主日01
来自CCWiki华人基督徒百科(Godwithus神同在网)
海德堡要理问答 海德堡要理问答主日1 HC01
目录
1 英文版
2 英文2011版
3 中文赵中辉版
4 中文钱耀诚版
5 中文陈达版（王志勇版）
6 圣经课程 -- 基督教教义
英文版
1. Lord's Day
Question 1. What is thy only comfort in life and death?
Answer.
That I with body and soul, both in life and death, (a)
am not my own, (b)
but belong unto my faithful Saviour Jesus Christ; (c)
who, with his precious blood, has fully satisfied for all my sins, (d)
and delivered me from all the power of the devil; (... 阅读全帖 |
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