t******n 发帖数: 2939 | 1 ☆─────────────────────────────────────☆
thirdman (三蛮子) 于 (Mon Sep 12 00:03:51 2011, 美东) 提到:
9月12日就是传统佳节,总是有很多思绪的节日,中秋节。关于中秋节的起源,大家不
度娘,能说出个一二三吗?哈哈,肯定很多人傻眼了吧。。。其实我也不知道。
“中秋”一词,最早见于《周礼》。根据我国古代历法,农历八月十五日,在一年秋季
的八月中旬,故称“中秋”。一年有四季,每季又分孟、仲、季三部分,因此秋中第二
月叫仲秋,到唐朝初年,中秋节才成为固定的节日。《新唐书·卷十五 志第五·礼乐
五》载“其中春、中秋释奠于文宣王、武成王”,及“开元十九年,始置太公尚父庙,
以留侯张良配。中春、中秋上戊祭之,牲、乐之制如文”。据史籍记载,古代帝王祭月
的节期为农历八月十五,时日恰逢三秋之半,故名“中秋节”;又因为这个节日在秋季
八月,故又称“秋节”、“八月节”、“八月会”、“中秋节”;又有祈求团圆的信仰
和相关习俗活动,故亦称“团圆节”、“女儿节”。因中秋节的主要活动都是围绕“月
”进行的,所以又俗称“月节”、... 阅读全帖 |
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t******n 发帖数: 2939 | 2 ☆─────────────────────────────────────☆
purity (purity) 于 (Wed Aug 17 00:41:32 2011, 美东) 提到:
看到一些猪头男一直在网上说女人不如男人,智力创造力不如男人,
说什么几千年历史证明男人才是社会的强者。
女人之所以弱,无非是因为生育和培养下一代花费太多精力,
怀孕生小孩,对女人来说,就像走过一回鬼门关,
照料下一代女人更是付出无数心血。
要是女人的身体结构如男人般强壮,也不用生育照顾孩子,
跟男人一样把时间精力花在事业上,很多男人会哭,
比起脑袋灵敏度,学习能力,很多男人不如女人。
☆─────────────────────────────────────☆
yugong (愚公挖坑) 于 (Wed Aug 17 01:13:48 2011, 美东) 提到:
我觉得你没有弄清楚为什么,你学数理化是为学而学,这样属于专业培训,老师好,人
聪明勤奋,肯定能拿奖。但是容易高分低能。
但是在复杂的社会环境里事业有成需要创造力,也就是要触类旁通,或者为了应用而学
。你觉得自己够聪明,数理化... 阅读全帖 |
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R******d 发帖数: 5739 | 3 http://en.wikipedia.org/wiki/Ice_core
quote
The length of the record depends on the depth of the ice core and varies
from a few years up to 800 kyr (800,000 years) for the EPICA core. The time
resolution (i.e. the shortest time period which can be accurately
distinguished) depends on the amount of annual snowfall, and reduces with
depth as the ice compacts under the weight of layers accumulating on top of
it.
Upper layers of ice in a core correspond to a single year or sometimes a
single season.... 阅读全帖 |
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R******d 发帖数: 5739 | 4 http://en.wikipedia.org/wiki/Ice_core
quote
The length of the record depends on the depth of the ice core and varies
from a few years up to 800 kyr (800,000 years) for the EPICA core. The time
resolution (i.e. the shortest time period which can be accurately
distinguished) depends on the amount of annual snowfall, and reduces with
depth as the ice compacts under the weight of layers accumulating on top of
it.
Upper layers of ice in a core correspond to a single year or sometimes a
single season.... 阅读全帖 |
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H********g 发帖数: 43926 | 5 前几天在netflix上看了个TED,里面说今日地球上的铁矿,就是因为远古蓝细菌的作用
,把原本缺氧的水-大气圈搞成了氧化性的,结果把海里的二价铁氧化成三价铁沉淀了。
wikipedia上这么说:
Banded iron formation
Some of the oldest known rock formations, formed over 3,700 million years
ago, include banded iron layers.[2] Banded layers rich in iron were a common
feature in sediments for much of the Earth's early history but are now rare
.[citation needed] Phanerozoic ironstones generally have a different genesis.
The conventional concept is that the banded iron layers were formed in sea... 阅读全帖 |
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p*****g 发帖数: 172 | 6 上个星期我们系在central park边上租了一个restaurant开party
很black tie的,男生有穿tux的女生穿什么的都有.
要求有家属的带家属
我team的一个日本女生(她的名字用中文写作香织,我今儿才知道)穿了一身和服(Kimono)
惊艳四座,据了解,这身和服价值$10,000,共有三十多样零部件,
她光找这些东东就花了两个小时,然后去Manhattan一家店里面专门帮人穿和服的,
穿了快三个小时!
据说和服有很多很多的layer,最普通的是两层layer,日本太子妃结婚时穿的有
十二层layer!,以至于很重得有人帮忙搀扶着.
因为从underwear一直到 socks都是配套的丝做的,洗起来非常非常麻烦,
所以她们会用很多层layer,最外面一层就比较不用经常洗,而要洗的时候要把
它拆开来.
听了这番介绍就目瞪口呆,心中感慨着jeans的美好.
最分特的是我team的一个英国男生说,
有一万刀不如去买Mercedes 啊 |
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k****h 发帖数: 27 | 7 You need javascript to do this job.
If you are not good at js, search "static layer" or "float layer".
If you are using DreamWeaver, find the extension for "static layer or
float layer". |
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z*****n 发帖数: 7639 | 8 you mixed MAC layer and transport layer.
If there are two processes, 1 tcp 1 udp, they are both sending
to the network layer with same rate. How come a "channel collision"
will affect only tcp?
If the udp process keeping pushing packets to the network layer,
it will blow the IP packet buffer, not the channel. But we are
not talking that the UDP process is greedy and the tcp is not,
right?
silverhawk (silverhawk) 的大作中提到: 】 |
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S**I 发帖数: 15689 | 9 obviously representation of the map comprises multiple layers, like one
layer for the whole united states, one layer for a metropolitan, one layer
for a city block, etc.
一个 |
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w*******f 发帖数: 5 | 10 【 以下文字转载自 JobHunting 讨论区 】
发信人: wildstuff (Wild Stuff), 信区: JobHunting
标 题: 内推Amazon FW engineer positions
发信站: BBS 未名空间站 (Tue Dec 31 19:38:04 2013, 美东)
我也内推一下吧。Office在加州湾区,主要是Embedded firmware 和 Linux-based
platform, developer and AE 都招。欢迎fresh grad和junior。 有兴趣的,简历请寄
w****[email protected].
JD highlights:
• Improve application-layer and network layer protocols according to
given standards and implement new features
• Implement API interfaces between layers and between core modules and
UI... 阅读全帖 |
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s****e 发帖数: 282 | 11 Several application processes run on the same machine. They communicate with
each other with UDP packets. Why some UDP packets are lost? The destination
address of the UDP packets is the machine's IP address, not 127.0.0.0.
Since the application processes are on the same machine, the UDP packets go
from application layer to network layer, then back to the application layer.
They will not reach link layer, right?
Thanks. |
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s*********4 发帖数: 1980 | 12 简单说,应该是速度和效率吧.参考CISCO的multilayer switching with Content
Express Forwarding (CEF)可以展开来回答这个问题.用于layer 2 switching的
Forward Information Base table建立于layer 3的routing table基础上.Layer 2处理
不了的某些类packets可以立刻转给Layer 3的Engine处理等等. |
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L******t 发帖数: 1985 | 13 来自主题: EmergingNetworking版 - 网络技术问题 Didn't notice that. But think about it, IPv6 as a transport layer never runs
on its own. So as long as there are always a lower layer & a upper layer w/
error checking, the middle layer does not have to.
transport |
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z****e 发帖数: 3810 | 14 如果你想load进来的东西在某些layer的下面,你可以在这些layer下面加一个layer,
在这个layer中建一个空的MovieClip,然后在这个空的MovieClip中load你的东西,这
样就不会block其他东西了。 |
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b******e 发帖数: 1861 | 15 现在流行的云计算怎么能够应用到传统的web layer+domain layer+database结构的应
用系统?
对于Google doc这种云应用我可以理解,用户的数据都放到云里。可是对一般的数据库
存储数据,
domain layer用java实现存取数据到数据库,然后servlet和domain logic layer交互
取存数
据的应用,云计算怎么和这些结合呢?难道数据可以不用存到数据库里? |
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f*********m 发帖数: 726 | 16 不是网页(presentation layer)方面的,主要想知道data layer, service layer,
business layer方面的,以及数据处理(比如Machine learning)方面的。
非常感谢。 |
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S**********n 发帖数: 264 | 17
Keep image data in native buffer all the time. .net/java manages meta data.
Only commands and pointers are passing to/from these two layers, probably
through JNI or C++/CLI. Threading could happen in java layer or native
layer. Usually, architects don't believe C++ developer's knowledge on
threading. As I said, this is standard practice in industry. Dealing with
data on GPU might be a little bit different.
For image data, even C++ containers are presumed to be bad. C, good old C,
rocks.... 阅读全帖 |
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N********n 发帖数: 8363 | 18
一个应用三个LAYER。这NODE除了WEB LAYER还有啥用?BUSINESS LAYER肯定
没戏啊,谁没事用JS写BUSINESS LOGIC?DATA LAYER更不可能了。 |
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m***t 发帖数: 254 | 19 某paypal早期员工告诉我, paypal开始的时候用的是c++, compile成一个大.so
deploy上去,因为不断加功能, 到后来这个.so几个G大, 这还是二十一世纪的前几年
的事情, 后来很多很多年以后paypal慢慢把service改成java了。 后来这位老兄自己
做网站, 坚决走python了。
amazon jeff bezos 强推java service的故事大家都知道了。
yahoo开始的时候也是用c++写cgi网页, 后来一个聪明人rasmus lerdorf 写了一
堆模版, 包装到一起叫php。 所以web layer慢慢过度到php了。 data layer换java是
这几年的事情。
google 早期data layer也是c++的, 看看gfs, bigtable 就知道了。
fb倒是java用的比较早。 linkedin的data layer也是java。 |
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n******t 发帖数: 4406 | 20 layer套layer,然后别人再在你的layer上加layer。 |
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发帖数: 1 | 23 卫东,这就是我执啊。佛法难就难在这里,即使你的意识其实也没有存在的实体,无非
是缘的聚合。
你的意识不能独立于缘而存在,这一秒你的意识,无非是前一秒之种种的反映。
打个比方,hidden layer的输出能脱离input存在吗?不能。hidden layer的输出能脱
离w, b, activation存在吗?不能。hidden layer的输出能脱离training data存在吗
?不能。
而众生执迷于一个其实如梦如幻的hidden layer,给他一个名言叫意识,你觉得它是实
有的,那只是你还没有断我执。
在下胡说八道,其实也是道行粗浅,真要理解佛法很难啊。越学越觉得高妙。 |
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w***g 发帖数: 5958 | 24 学习了一晚上,总结一下
- slim似乎已经完蛋了。
- 现在high-level API是tf.layers。
- 但是tf.layers和tf.contrib.framework.arg_scope不兼容,所以还是得用tf.
contrib.layers。
- batch_norm在multiple gpu上似乎没有一个干净的解决方案。
- tf.variable_scope可以设default initializer,
但是用不用这个initializer看各个layer实现的喜好。比如,conv2d的weights和bias
是不服从这个默认值的。batch_norm的moving_mean和beta不服从,但是batch_norm的
moving_variance服从。这些东西文档里是没有的,得靠自己理解。
都是些什么乱七八糟的。最近发现官方slim的resnet干不过github上的鸡毛项目。
所以打算自己把常见的几个model撸一遍。然后就发现前面的路好艰难。 |
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j***j 发帖数: 9831 | 25 http://sites.ieee.org/spotlight/internets-finished-yet/
Last year’s revelations about the US government’s surveillance of online
traffic were a wake-up call to provide better protection of user privacy and
confidentiality — including the regular use of end-to-end cryptography at
multiple levels in the protocol architecture. Vint Cerf, IEEE Fellow and
vice president and chief Internet evangelist for Google, says that’s only
the first step — an important caution from someone whose word is consider... 阅读全帖 |
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a*****s 发帖数: 838 | 26 Need to separate some virions with Sucrose ultracentrifugation (PI said we
don't need to do CsCl :( - that would have been easier to search for
literature if so). Anyway, I did some trial runs. My goal is to separate the
samples to several layers (if there is different shape of viral particles).
Then collect the layers and run on western blot to see and compare.
take I : 17300 rpm at 4C, x 90 min --> no separation
take II: 30000 rpm at 4C, x 90 min --> no separation
take III: 30000 rpm at 4C, x ... 阅读全帖 |
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s******y 发帖数: 28562 | 27 Polysome purification and fractionation
(Based on Davies & Abe, 1995, Methods in Cell Biology, Vol 50, Chapter 15)
1. Prepare 4.6ml 15-60% sucrose gradients in 5ml polyallomer tubes (Beckman
#326819) by
pipetting 2.3ml of 60% sucrose in buffer B followed by 2.3ml of 15% sucrose
in buffer B
(slowly, drop by drop, against the wall). Cap the tubes with rubber stoppers
and lay tubes
horizontally for 3h @RT for sucrose to diffuse (or for 2h if making 10-40%
gradient). Place the
tubes again vertically... 阅读全帖 |
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发帖数: 1 | 28 大家好,
这个星期第一次做CHIP.完整的protocol就不贴了,但:
1. reverse crosslink 在65℃上热了16个小时。
2. 然后加proteinaseK在37℃热了2个小时。
3. 纯化DNA用的是phenol/chlorofoam.做这一步的时候有点怪。加了phenol/
chlorofoam然后spin down,可以看到aqueous layer和organic layer,但中间的那层
lipid layer基本上就没有。
最奇怪的是phenol/chlorofoam的最后几步。我把aqueous layer提出后加ethanol+NaCl
+glycogen, 然后放零下80℃三个小时后spin down, 居然看到一个有我半个小拇指指甲
大的白色的precipitate.当时我就觉得有点不对劲。但我用70%ethanol洗了一遍之后,
这个precipitate的体积马上减少了90%多,颜色也变蓝了(我们用的glycogen是蓝色的
glycoblue).之后我再洗了一遍。
最后我用nanodrop测,发现所有sample的260/280都只有1.... 阅读全帖 |
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R*****U 发帖数: 241 | 29 here it is for your reference:
To a three-necked flask equipped with a nitrogen source inlet, an addition
funnel and a cold thermometer, cooled to -5℃ was added a solution of methyl
glycinate hydrochloride 34 (31.7 g, 250 mmol) in water (63 mL) followed by
CH2Cl2 (150 mL). An ice-cold solution of sodium nitrite (20.9 g, 300 mmol)
in water (63 mL) was added and the reaction vessel was cooled to -10℃. An
aqueous solution of H2SO4 (5 wt%, 24 g) was added via the addition funnel
over a 3 min period.... 阅读全帖 |
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a*********r 发帖数: 14 | 30 对不起,我还真是给武大化学系留了面子。
莫非你就是其中一件丑事的主角,干嘛一触即发,破口大骂呢?
袁荃做的是还不错,但不意味武大化学系就有多好了。
举例来说,即使袁荃和另外一位新招的楚天特聘教授傅磊相比,也能看出武大化学系在其中有没有猫腻了。
首先补充一点:袁荃的老公叫廖蕾,也是武大物理系新招的楚天特聘教授,可以作为很好的对照体系。
比比三人的publication和经历,就能明显看出水平之比是:
廖蕾>袁荃>傅磊
但从袁荃却没有评上楚天特聘。
廖蕾
http://physics.whu.edu.cn/node/557
1. Y. Z. Long, L. Liao*, X. F. Duan, Z. Y. Fan*, Large-scale Integration of Semiconductor Nanowires for High Performance Flexible Electronics ACS Nano (In press)
2. L. Liao, J. W. Bai, R. Chen, H. L. Zh... 阅读全帖 |
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a*********r 发帖数: 14 | 31 对不起,我还真是给武大化学系留了面子。
莫非你就是其中一件丑事的主角,干嘛一触即发,破口大骂呢?
袁荃做的是还不错,但不意味武大化学系就有多好了。
举例来说,即使袁荃和另外一位新招的楚天特聘教授傅磊相比,也能看出武大化学系在其中有没有猫腻了。
首先补充一点:袁荃的老公叫廖蕾,也是武大物理系新招的楚天特聘教授,可以作为很好的对照体系。
比比三人的publication和经历,就能明显看出水平之比是:
廖蕾>袁荃>傅磊
但从袁荃却没有评上楚天特聘。
廖蕾
http://physics.whu.edu.cn/node/557
1. Y. Z. Long, L. Liao*, X. F. Duan, Z. Y. Fan*, Large-scale Integration of Semiconductor Nanowires for High Performance Flexible Electronics ACS Nano (In press)
2. L. Liao, J. W. Bai, R. Chen, H. L. Zh... 阅读全帖 |
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s*******1 发帖数: 6 | 32
谢谢你的回复,我现在做的工作与sensor关系不大,其实更偏向network layer和cross
-layer设计,对MAC layer 和physical layer略有涉及,其实就是做网络。 |
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a********d 发帖数: 9 | 33 I need to understand some basics regarding how the optical discs (DVD, CD)
work. For examples, what is an S-curve exactly? When one says "OPU pick up
unit receives reflected optical signals", where exactly do the reflected
signal come from, the coated layer of the indentation "pits", or the
protective layer behind the coat of the data layer? What about multi-layer
discs? What does bit rate mean in the context of optical disc? Thanks! |
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F*M 发帖数: 1861 | 34 The 54 Mbps is the physical layer information bit rate.
Here is the computation procedure:
Physical layer modulation symbol rate = symbol rate per sub-carrier x number
of carriers = 250kbps x 48 = 12 Msps
Physical layer coded symbol rate (with binary codes) = Moulation symbol rate
x modulation rate = 12 Msps x log2(64) = 72 Mcps
Physical layer information bit rate = 72 Mcps x (3/4) = 54 Mbps.
The DLL throughput would be less due to the need to strip off additioinal
overhead (~10%). |
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c****n 发帖数: 21367 | 35 想弄一些wireless节点,单独的或者是接在电脑上的都行,WiFi的
主要要求有如下6条(已经查过的linux + wireless adapter方案基本
不行,大部分host driver功能都不够,windows有个2.5层的套件,
对MAC的控制不太够,而且很复杂,单板的目前没看到合适的)
要求基本集中在MAC层的控制上,对物理层的要求很少,不涉及模拟部分
1. data transmission capability with full open source protocol stacks
2. MAC layer control: can modify the most fundamental MAC layer protocol
such as the ARQ
3. MAC layer data interface: the host pc can fully monitor and control the
entire MAC layer transmission process and has access to every digital bits
after |
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n*l 发帖数: 44 | 36 Maybe you can use mine as a reference.
I did a split plane 4 layer board. The reason is that I have sensitive
analog circuit that needs to be isolated from digital switching for noise
concern.
So my board has top/bottom layers and 2 internal layers designated to power
planes. Each internal layer are split into two, "split plane", left half
for digital vdd and ground, right half for analog vdd and ground.
So when the board comes back from the company, you hold it under the light,
you can act |
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b*****t 发帖数: 1700 | 37 physical layer security没有必要去实现perfect secrecy啊
那样就不会牺牲很多数据传输的能力
physical layer security本质只是让eavesdropper decode数据的能力降低,比如用
jamming去实现
另一方面,keyless的意义在于在decentralized networks里,key的distribution和
management是个大麻烦
目前基于channel这个假设(wiretap channel)确实是个比较头疼的事情,很限制实用
,但所以才需要研究
而且wiretap channel也只是physical layer security和information theoretic
security中的一个研究方向而已,不基于这个假设的研究还是很多的,但努力在
physical layer就实现security肯定会是以后的方向,这个我觉得未来是会有实用性的
practical
bf
得到 |
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b*****t 发帖数: 1700 | 38 physical layer security没有必要去实现perfect secrecy啊
那样就不会牺牲很多数据传输的能力
physical layer security本质只是让eavesdropper decode数据的能力降低,比如用
jamming去实现
另一方面,keyless的意义在于在decentralized networks里,key的distribution和
management是个大麻烦
目前基于channel这个假设(wiretap channel)确实是个比较头疼的事情,很限制实用
,但所以才需要研究
而且wiretap channel也只是physical layer security和information theoretic
security中的一个研究方向而已,不基于这个假设的研究还是很多的,但努力在
physical layer就实现security肯定会是以后的方向,这个我觉得未来是会有实用性的
practical
bf
得到 |
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kn 发帖数: 2446 | 39 我是做物理层的。network layer不大了解。
上层都是软件,自己实现吧。
Prof.Knightly的组用WARP做了不少MAC层(或Network层)的东西。
http://www.ece.rice.edu/~knightly/
他们的网页里提到:
“WARP
We have designed and implemented a FPGA-based hardware platform for clean-sl
ate design of wireless network protocols. The platform is fully programmable
at all layers from the physical layer on up. The platform supports cross-la
yer protocol implementation and has a high-performance physical layer for "a
t scale" experiments.” |
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i*****t 发帖数: 24265 | 40 overnight?说的是shipping吧,找外面的花几百块至少也得几天才能拿到,最快的3天
才能拿到。下面是俺常用的公司,请教你用的1天overnight的是哪一家,谢谢。
-Order 2-layer designs with SAME DAY – 3 Day Turns
-Order 4 -10 layer designs with ONE DAY – 5 Day Turns
Custom Spec;
-Order 2-Layer designs SAME DAY – 4 Weeks
-Order 4 -10 Layer designs ONE DAY – 4 Weeks
don |
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t*****y 发帖数: 27 | 41 Edit:
Forgot to mention, there is also an intern opening for Java / Web
development, which could be transfer to a permanent position next year.
【 以下文字转载自 JobHunting 讨论区 】
发信人: tricity (meyer), 信区: JobHunting
标 题: 湾区硅谷工作机会 -- Application Enginner
发信站: BBS 未名空间站 (Sun Jul 10 00:11:03 2011, 美东)
组里现在有两个opening。因为project进度的原因,warm-up的时间很短(1-2周)。所以
有实际工作经验(经过正式的software release流程,学校里的Project不算)的会优
先考虑。中等规模上市公司,待遇Market competitive,sponsor H1-B/绿卡。
JD 如下:
Given specified requirements of an application ... 阅读全帖 |
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w*******f 发帖数: 5 | 42 【 以下文字转载自 JobHunting 讨论区 】
发信人: wildstuff (Wild Stuff), 信区: JobHunting
标 题: 内推Amazon FW engineer positions
发信站: BBS 未名空间站 (Tue Dec 31 19:38:04 2013, 美东)
我也内推一下吧。Office在加州湾区,主要是Embedded firmware 和 Linux-based
platform, developer and AE 都招。欢迎fresh grad和junior。 有兴趣的,简历请寄
w****[email protected].
JD highlights:
• Improve application-layer and network layer protocols according to
given standards and implement new features
• Implement API interfaces between layers and between core modules and
UI... 阅读全帖 |
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l***i 发帖数: 38 | 43 My boss wants me to calculate the stress field around a crack tip, the
structure is a two layer structure with finite thickness each layer. There is
a crack in the top layer with tip touching the second layer. It is under
tension. does anybody know whether there is an analytical solution for this? I
am in material science area. I asked several guys in mechanics, however,
nobody knows it. I really really appreciate it.BTW, if I use ANSYS or ABACUS,
is it difficult? |
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c******7 发帖数: 1177 | 45 就是前者,TRKR in GaAs,以前UCSB的Awschalom研究半导体搞的实验方法. 大家长期以
来都这么用,但是我一直没弄清楚这里面的最根本原理。半导体里面,信号一般都来自
中间的active layer.cap layer 的引进是为了保护里面active layer的一些性质,比
如避免band bending之类的。一般的资料上都说, Kerr effect 是来自表面,这在金
属里面,理解上我没什么问题,但是放在半导体里面为什么能测到cap layer 以下的信
号。所以我一直疑问,是不是这个“表面”是不是有厚度的。
GaAs在圆旋光激发后,可以产生瞬间electron spin polarization。
上面有人提出了一些理解,也让我受益匪浅。在这里面讨论还是能学到一些东西。 |
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A*******s 发帖数: 3942 | 46 想了一下,我能想出来的解决方法就是用一个global macro variable &layer, 每次调
用一个macro program,&layer就+1,然后把macro里面创建的temporary datasets都以
_&layer为前缀命名,macro结尾再删去_&layer: 的所有datasets。
不知道有没有更简单的方法。 |
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k*****e 发帖数: 22013 | 47 是不是ps一点基础都没有的?
这样吧,先打开月亮那张图。按ctrl-L,
把上面一排最左边那个小三角往右边拖,直到夜空的背景全黑为止。
然后确定,ctrl-A全选,ctrl-C复制。
再打开实景那张图,ctrl-V粘贴月亮,然后看layers框(找不到layers就按F7)
确定当前选择的是月亮那一层(一般是layer 1),而不是background。
把layers框左上角那个normal下拉菜单改成screen。
这时候月亮就在实景上了。但是可能位置和大小不理想。
按一下ctrl-t,就可以缩放大小,移动位置,合适以后回车确认。 |
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I***i 发帖数: 14557 | 48 http://en.wikipedia.org/wiki/Chameleon
Change of color
Some chameleon species are able to change their skin colors. Different
chameleon species are able to change different colors which can include pink
, blue, red, orange, green, black, brown, light blue, yellow, turquoise and
purple.[18]
Color change in chameleons has functions in social signaling and in
reactions to temperature and other conditions as well as camouflage. The
relative importance of the classes of function vary with the circums... 阅读全帖 |
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z*******n 发帖数: 1034 | 49 iOS是个操作系统,注意其拼写的大小写,它运行在iPhone,iPad 和iPod touch 上,
它的集成开发环境软件叫做Xcode,
搭建开发环境的最简便方法就是有一台基于Intel CPU的Mac电脑,从App Store下载安
装Xcode,也就是说做iOS开发
最好有一台不太旧的MAC电脑。
iOS提供了SDK,就是包含了已经做好的些工具和接口来让程序员使用,包括:
—Cocoa Touch Layer
主要是用户界面呈现,布局,和交互;比方说需要一个按钮,SDK就提供了一个按钮
,需要居中对齐,SDK就提供了对齐的工具,
需要识别用户在这个按钮上的点击,SDK就提供这个识别。
—Media Layer
主要是用户界面呈现的底层技术工具和多媒体工具:比方说画一个按钮,播放声音
视频,画文字。
这其中还包括一个2D/2.5D游戏引擎叫做Sprite Kit , 以及OpenGL ES
—Core Services Layer
主要是些看不见的工作的些工具,数据的取存,通讯,定位,系统设置等
—Core OS Layer
主要更底层的... 阅读全帖 |
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