d*****r 发帖数: 39446 | 1 【此篇文章是由自动发信系统所张贴】
flatland 申请加入本俱乐部的请求已经通过审批, 成为本俱乐部的正式成员, 特此通知. |
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m***a 发帖数: 2262 | 3
不如我的古雅
Rushing to battles from ten thousand miles afar,
Mountains and passes a mere flatland under my flying strides |
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w*l 发帖数: 43 | 4 A room in a 2 bedroom apt.
Spacious rooms.
Close to 2/5 train Flatbush/ Brooklyn college station.
Convenient to stores
Nice and safe neighborhood.
Flatbush ave / ave I.
Three stops to Suny Downstate Medical Center/ Kings County Hospital.
$550 / month, including internet / utility.
w****[email protected]
901-337-8051 |
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g******s 发帖数: 6 | 5 We are seeking a highly motivated postdoctoral researcher to join in a USDA-
funded project on watershed management and water quality in Missouri
watersheds. The position is available immediately. The successful candidate
will work with a group of scientists, graduate and undergraduate students at
Cooperative Research Programs at Lincoln University in Missouri. Research
will be in the area of field experiment and application of hydrologic/water
quality models for watershed management. Research c... 阅读全帖 |
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g******s 发帖数: 6 | 6 We are seeking a highly motivated Master graduate student in environmental
science to join in a USDA-funded project on watershed hydrology and water
quality in Missouri watersheds. The assistantship is available immediately.
The successful candidate will work with environmental scientists at
Cooperative Research Programs at Lincoln University in Missouri and Cropping
Systems and Water Quality Research Unit, USDA-ARS in Columbia, MO. Research
will focus on understanding hydrologic processes contr... 阅读全帖 |
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l*********e 发帖数: 10 | 7
http://www.redfin.com/CA/Irvine/60-Eclipse-92620/home/5958818?
Your description is so misleading! Your house is on a flatland with only
neighbor or street views. Unobstructed view? How about the neighbor on your
back yard and the condos to your front yard? Disneyland fireworks? You must
be kidding! City lights view? Probably your neighbor's lights or streets
lights. Sunset view? 4pm Sunset. Woodbury Elementary is the second to worst
school in Irvine school district.The comp for your house is $1... 阅读全帖 |
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f********1 发帖数: 1949 | 8 手上还有$700 gift card, 要求本周日(11/29)之前买日用品全部用掉, 你可以留
下$100的东西.
pathmark address
111-10 FLATLANDS AVENUE
BROOKLYN, NY 11207
2730 ARTHUR KILL RD.
STATEN ISLAND, NY 10309
AP address
230 SAW MILL ROAD
MILLWOOD, NY 10546
Please email me [email protected]
/* */ |
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c*******r 发帖数: 13580 | 10 you live in the wind city and flatland america :) |
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R*****s 发帖数: 41236 | 11 跑步也有更BT的....这个神仙把东西两岸的trail跑遍了,从南跑到北:
http://www.extremeultrarunning.com/dhhist.htm
In 1991, Horton set foot on Springer Mountain in Georgia to begin chasing
the Appalachian Trail speed record, which stood at 62 days. Fifty-two days,
nine hours, and 42 minutes later, David stood atop yet another mountain,
Katahdin, in Maine. His relentless pursuit of the record carried him over
2144 miles of trail, solitude and isolation being his constant companions.
But despite the grueling nature of the feat,... 阅读全帖 |
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c******i 发帖数: 362 | 12 昨天一早5:30从家出发去Brazos State Park 说好和一个朋友CARPOOL结果我到了见面
的地点发现我鞋子没带,回家取了以后没办法在7:30以前和其他骑友集合于是我们决定
去另外一个公园Zube Park.到了以后发现人山人海啊,至少有一两百人,我和朋友骑的
是18-22的Group,回来我和朋友两人单独骑回来的,全程45.7mile,one stop,用时2
小时17分,平均速度19.5。期间我有一次转弯差点冲出车道,于是减速,结果掉队了,
我转弯的时候经常控制不好,SOLO的时候也经常出现这个问题:(。休斯顿7月22号有
flatland century ride,我准备去试试那个62miles 的。从没骑过那么远这周末有个
51miles 的可以先练练腿了。照片是去的时group stop的地方拍的,一个GROPU 就这么
多人,我是第一次见这么多人骑车,lol 我又大惊小怪了,见笑见笑。 |
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c******i 发帖数: 362 | 13 这次骑的叫katy flatland century 所以几乎都是平的,所以这100miles比较容易。如
果是hills那我估计要躺着回来了。 |
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i*********5 发帖数: 19210 | 14 CRUISERS
Cruiser bicycles offer a laid-back frame style with upright handlebars for
better control and comfort. Typically they have few or no gears, keeping
them simple. With a retro look, cruisers offer the rider something chic and
stylish for a casual ride. Cruisers do not perform well on hills because of
the lack of gearing and typically heavy frames, but they're excellent for
flatland rides on smooth surfaces, like a boardwalk ride along the beach.
你经常能在度假区沙滩边上的trail看见。非常laid-back和休闲! |
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m*****5 发帖数: 23482 | 15
跟FLATLAND一样了,男人是2维,女人是一维 |
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m****g 发帖数: 3975 | 16 About Moose River Accident, mostly I agree with this gentleman.
Registered Member #6382
Joined: Tue Jul 21 2009, 08:32 am
Location: BEERlington, VT
Posts: 277
I could post this in the Moose thread, but I don't want to sound
condescending towards the deceased or injured folks. I won't comment on the
notable accidents that did occur since I wasn't present for any of those,
but I will share some observations from this fall's riverfests.
-On labor day weekend at Moshier, as many of you remember, the... 阅读全帖 |
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m****g 发帖数: 3975 | 17 About Moose River Accident, mostly I agree with this gentleman.
Registered Member #6382
Joined: Tue Jul 21 2009, 08:32 am
Location: BEERlington, VT
Posts: 277
I could post this in the Moose thread, but I don't want to sound
condescending towards the deceased or injured folks. I won't comment on the
notable accidents that did occur since I wasn't present for any of those,
but I will share some observations from this fall's riverfests.
-On labor day weekend at Moshier, as many of you remember, the... 阅读全帖 |
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N******t 发帖数: 16051 | 18
可能它们存在于四维空间~
獭獭看过flatland没,我觉得好有意思 |
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w**********u 发帖数: 132 | 20 The land
Soils
After centuries of rice cultivation, soils in the valley plains have been
greatly modified. Well-developed gray-brown forest soils are widely
distributed in the forest areas of the interior mountains, whereas mature red
soils are common in the low hills and on high terraces. White saline soils and
salt swamps are found in the coastal flatlands. Their parent rocks are marine
saline deposits, penetrated by seawater. Attempts at desalination appear to
have been successful, and some s |
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t*******n 发帖数: 4445 | 23
刚看完《Flatland: A romance of many dimensions》, Edwin A. Abbott
(1838-1926) 。比较小儿科啦。 |
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d*******r 发帖数: 3875 | 25 前面的想象里说到了二维生物看到三维投射在二维世界里的影像,以及三维的我在卧室
里观察二维宇航员。在Flatland里,三维手指穿过二维世界引起惊恐。二维和三维之间
能不能交流,怎么交流? 不知道,但上述描述都是假设二维和三维可以进行物质层面
的交流,所以是不准确的。
困难在于二维空间据其定义是没有厚度的,三维物体即使穿过二维空间,也不会在那里
留下切面--根本没有面,何来切面。二维空间里的一切,也不会在三维空间里看得见,
因为三维影像也是需要三维物质来构成的。如果没有电影屏幕(布幕也好水幕也好),
你看得见电影吗?没有光这种三维物质,有三维影像吗? 光也是有物质基础de。
现在把构成世界的基础因素称为“基质”。唯物论认为基质=物质,唯心论认为基质=先
验的意识或法则。现代“自然科学”基本上是唯物论,据此,基质=物质。
这就有困难了。构成二维空间的物质跟构成三维的物质不应该相同,这是二维跟三维的
定义决定了的。三维的物质不可能构成二维空间。
好吧,构成二维世界的物质跟构成三维世界的物质不是同一种。所以两个世界在基质层
面不相为谋,只进行能量交流。这样二维世界和三维世界共存,但彼此感受不到... 阅读全帖 |
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O*******k 发帖数: 1743 | 26 your got it
显然是一个文科生看flatland没看懂的水平 |
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n********n 发帖数: 8336 | 28 因为人有自由意志,所以人要为自己负责。
神有预定,也有预知。 神有有指导性旨意,也有容许性旨意。
如何实现神的意志?
通过人的自由意志。
但要注意,人和人的自由意志可以是冲突的。
神的意念高于人的意念,神的道路高于人的道路。
人不可能完全理解神的意念,虽然有显明的旨意可以遵守。所以,以己度神是不对的。
神可以利用人的自由意志达到神的目的。
但神的目的,人限于自己时空和有限,不可能完全知道。
神要做的事,都可以成就,但可以不控制人。
神的超越性,以及奥秘性,可用这个例子说明一下,注意这只是例子。
人的自由,只是在人的层次。
FLATLAND
http://www.youtube.com/watch?v=BWyTxCsIXE4 |
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d*******r 发帖数: 3875 | 29 前面的想象里说到了二维生物看到三维投射在二维世界里的影像,以及三维的我在卧室
里观察二维宇航员。在Flatland里,三维手指穿过二维世界引起惊恐。二维和三维之间
能不能交流,怎么交流? 不知道,但上述描述都是假设二维和三维可以进行物质层面
的交流,所以是不准确的。
困难在于二维空间据其定义是没有厚度的,三维物体即使穿过二维空间,也不会在那里
留下切面--根本没有面,何来切面。二维空间里的一切,也不会在三维空间里看得见,
因为三维影像也是需要三维物质来构成的。如果没有电影屏幕(布幕也好水幕也好),
你看得见电影吗?没有光这种三维物质,有三维影像吗? 光也是有物质基础de。
现在把构成世界的基础因素称为“基质”。唯物论认为基质=物质,唯心论认为基质=先
验的意识或法则。现代“自然科学”基本上是唯物论,据此,基质=物质。
这就有困难了。构成二维空间的物质跟构成三维的物质不应该相同,这是二维跟三维的
定义决定了的。三维的物质不可能构成二维空间。
好吧,构成二维世界的物质跟构成三维世界的物质不是同一种。所以两个世界在基质层
面不相为谋,只进行能量交流。这样二维世界和三维世界共存,但彼此感受不到... 阅读全帖 |
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l*******G 发帖数: 1191 | 34 3DML 是XML 的一个分支,如果用在数模visualization 里应该很酷,不知有人用没有。
http://www.flatland.com/ 右边有不少screenshot
有高人的话,请介绍好的学习资料。 |
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d*******r 发帖数: 3875 | 35 前面的想象里说到了二维生物看到三维投射在二维世界里的影像,以及三维的我在卧室
里观察二维宇航员。在Flatland里,三维手指穿过二维世界引起惊恐。二维和三维之间
能不能交流,怎么交流? 不知道,但上述描述都是假设二维和三维可以进行物质层面
的交流,所以是不准确的。
困难在于二维空间据其定义是没有厚度的,三维物体即使穿过二维空间,也不会在那里
留下切面--根本没有面,何来切面。二维空间里的一切,也不会在三维空间里看得见,
因为三维影像也是需要三维物质来构成的。如果没有电影屏幕(布幕也好水幕也好),
你看得见电影吗?没有光这种三维物质,有三维影像吗? 光也是有物质基础de。
现在把构成世界的基础因素称为“基质”。唯物论认为基质=物质,唯心论认为基质=先
验的意识或法则。现代“自然科学”基本上是唯物论,据此,基质=物质。
这就有困难了。构成二维空间的物质跟构成三维的物质不应该相同,这是二维跟三维的
定义决定了的。三维的物质不可能构成二维空间。
好吧,构成二维世界的物质跟构成三维世界的物质不是同一种。所以两个世界在基质层
面不相为谋,只进行能量交流。这样二维世界和三维世界共存,但彼此感受不到... 阅读全帖 |
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x*****d 发帖数: 427 | 36
文章出处:smth
发信人: Dionysus (悲剧的诞生), 信区: Science
标 题: 庞加莱猜想-维数的玩笑
发信站: BBS 水木清华站 (Fri Jul 18 00:09:01 2003), 转信
维数的玩笑
Dimension implies direction, implies measurement, implies the more and
the less.
—— Edwin A. Abbott, "Flatland"
1900年,Poincar\'e 最初用他所创立的代数拓扑研究三维流形时,提出的问题
是:如果一个流形与三维球面有着相同的同调群,那么这个流形是否同胚于 S^3?
四年后他本人给出了否定的回答。这时他已经引进了基本群,于是便将问题改成:
“如果一个三维闭流形与三维球面有相同的基本群,(即基本群平凡,或者说这个流
形单连通,) 那么这个流形是否同胚于S^3?”。这就是我们所说的“Poincar\'e
Conjecture”。
容易证明,如果一个三维闭流 |
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f******n 发帖数: 72 | 37
石墨烯发明者Geim 09年的三篇综述
1. beyond the wonder material
2. Graphene Status and Prospects
3. The electronic properties of graphene
4. Jacs: Room-temperature synthesis of soluble carbon nanotubes by the
sonication of graphene oxide nanosheets
5. Graphene: The New Two-Dimensional Nanomaterial
6. The rise of graphene
7. A physicist of many talents
8. drawing conclusions from graphene
9. exploring the flatland
10. Focusing on graphene
11. Moving towards a graphene world
12. The lightest bottomonia
13. h |
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