r****y
发帖数: 26819 | 1 前面你不是说要计算高度吗？"要算高度才知道SCROLL到哪里。"
“拼好之后手工算ITEM的高度，然后根据所有ITEM的高度以及LIST高度算SCROLL
POSITION.”高度是height吧。 |
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s*******l
发帖数: 35 | 2 【 以下文字转载自 Database 讨论区 】
发信人: stockgirl (好好读书), 信区: Database
标 题: Question about Excel
发信站: BBS 未名空间站 (Wed Jun 13 12:29:45 2007)
How can I make first row stationary while scrolling down a excel file?
I deal a lot with excel files (first row is title, from 2nd row down is lots
of data, and I wanna first row stay visible while scroll down the file to
see my data)
Thank you. |
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l***s
发帖数: 11 | 3 of course,but I think it's enough.
If you still want to display line number.
here is a el file(wb-line-number.el). it would satisfy what you need.
Add this file (byte-compiling it is recommended) to your load-path.
Then add these set of lines to your config:
(set-scroll-bar-mode nil) ; no scroll bar, even in x-window system
(recommended)
(require 'wb-line-number)
(wb-line-number-toggle)
======================================================================
;;; wb-line-number.el --- window-base |
|
j**h
发帖数: 126 | 4 nature.com
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Nature
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Volume 544
Issue 7648
News
Article
NATURE | NEWS
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Compass protein attracts heap of criticism
Debate grows over a molecule implicated in animal navigation.
David Cyranoski
04 April 2017
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George Grall/NGC
The red-spotted newt and many other animals can somehow sense Earth’s
magnetic field.
For decades, scientists have wondered how animals c... 阅读全帖 |
|
p**y
发帖数: 95 | 5 Suppose I have an object(molecular model) on a flat plane,
I now want roll it on the surface of cylinder, what is the
cartesian coordiantes of the model now? what if the surface
is the scroll, like the surface of a rolled paper?
I am a chemistry major, so the description may not be very clear.
Basically, what I want to do is, roll a crystal plane
to a cylinder or scroll surface. how to do this mathematically?
Thanks! |
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p*********e
发帖数: 32207 | 6 同样是DI 2 turbo,
不过加了valvetronic来进一步提高经济性跟引擎响应速度
(效果上类似于S54B32上的每缸单独throttle valve)
然后取消了双增压,改用一个twin-scroll增压器,似乎没有可变几何的设计
至少press release上没提.
感觉改用单增压器也就是体积重量成本上有好处,但论性能,
无论从响应还是改装潜力恐怕都不如.twin scroll虽然是能把在进气的跟排气的气缸分开
可根本上还是不如直接twin-turbo来的彻底. |
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c*********r
发帖数: 19468 | 7 the new 4.4L bi-turbo on the X5 M/X6 M is actually quite interesting
it has two twin-scroll turbos on a cross-plane V8
when BMW introduces the N63, they put the turbos in the V-valley
(reverse-flow design) people only mention that makes the engine more compact
but I felt that shouldn't be the most important reason
now you see the true reason, it allows the twin twin-scroll turbo design on
the new M version:) |
|
c*********r
发帖数: 19468 | 8 比较一下GM 2.0 SIDI和Mazda 2.3 DISI的图片，我个人认为GM更胜一筹：
1）DI方面均属于Wall/Air-Guided，但是GM的155bar胜过Mazda的115bar
2）GM在进排气凸轮轴上各用了一个Vane-Type凸轮轴相位调节器，实现连续双VVT
但是Mazda只在进气凸轮轴上用了。它的图没有显示调节器的内部构造
但是从体积看应该也是Vane-Type（Vane-Type算是第三代VVT）
3）GM的气门动作由滚轮式气门摇臂驱动，Mazda则是直接动作气门挺柱
在这样的中等转速的增压引擎上，使用摩擦损耗更低的滚轮摇臂要更为合理
4）GM通过一条专用的正时链条，把双平衡轴的位置提高到了引擎的中部
这是一个效果更理想的位置。相比之下，Mazda的图中看不到双平衡轴
但是根据资料，它还是有的，所以其平衡轴的位置很可能是在曲轴的下方
这是一个传统的布局方式，但是效果并不是最优化的
5）GM采用了Twin Scroll Turbocharger，Mazda的图中看不出来
但是根据资料它是普通的单Scroll。
不过从图中看，它的排气歧管的确也有类似VW 2.0 |
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c*********r
发帖数: 19468 | 9 other issues of I5s:
let's take the TT RS as an example.
it has only one turbo.
ok, you can say "show me a turbo I4 with 2 turbos"
this is not the issue. you can use a twin-scroll turbo on a high-output
turbo I4
even on others that have no twin-scroll turbo, such as the 2.0T on the TTS,
the exhaust manifold can still be
separated in a similar way. how can you do this on an I5? |
|
c*********r
发帖数: 19468 | 10 结构上最大的差别是排气和涡轮
N63虽然是reverse flow，但实际上并没有利用到这种设计的好处
还是每列气缸各吹一个single scroll
S63的排气是两列混排的，这样可以分出两股均匀的排气，各吹一个twin scroll |
|
c*********r
发帖数: 19468 | 11 嗯BMW家的引擎是各种技术一起上，管它是不是overkill……
象M5的S63B44Tu，直喷、Reverse Flow＋排气歧管混排＋twin scroll twin turbo、
Valvetronic、Double VANOS……我尻，非要这么复杂吗？
Audi现在也是这路数，他家的4.0双涡轮的新机器也是直喷、Reverse Flow＋排气歧管
混排＋twin scroll twin turbo、VVT，没有Valvetronic但是多了歇缸…… |
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c*********r
发帖数: 19468 | 12 STI没有可变几何涡轮啦，不过日规的STI的2.0L的turbo是twin scroll的，美规2.5L引
擎不是
这个新机器我估计是twin scroll的应该
其实你也没有什么遗憾的，等新WRX的话恐怕还得等两年，加上第一年的车最好别买
那就是3年出了去，根本没有必要。到时候你可能都把现在这个操烂了都：）
5 |
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i****x
发帖数: 17565 | 13 twin scroll不就是气缸分两组分别吹对方的scroll么，某种程度上已经跟你说的这个
类似了 |
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c*********r
发帖数: 19468 | 14 首先，twin turbo等于有两个压气叶轮，一个twin scroll turbo还是一个叶轮
一个叶轮要达到两个叶轮的压缩效果，实际上重量上是更大的（类似体积对面积的关系）
所以实际上twin turbo转动惯量总和是比一个twin scroll turbo小的
另外一个方面就是排气的路径，尤其是I6，你汇集6个缸吹一个turbo，再怎么弄排气路
径也短不了，换句话说，排气动能损失就多，对于impulse turbo来说，结果是不言而
喻了吧
好？ |
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c*********r
发帖数: 19468 | 15 一个小turbo比一个大turbo转动惯量小是没错，但twin turbo总的转动惯量其实没那么
容易估计
首先，如果r2=1.414r1的话，大turbo压气机转动惯量并不会是小turbo的1.414^3
具体是什么我不会算，但起码叶轮厚度不必也是1.414的关系
我们姑且算大turbo的压气机转动惯量大于两倍的小turbo吧，但是一个twin scroll
turbo在涡轮这一端以及轴承方面还省了结构重量了呢，两方面相加谁的总转动惯量更
小没有那么直截了当啊
就算是两个小turbo小些，但你转速要求还高呢，这又怎么办呢？
我还是倾向于感觉twin turbo实际上kick in的更晚
不过引擎转速上去后，由于大turbo工作转速低，%head衰得早，所以两个小turbo就后
来居上了
换句话说，一个twin scroll turbo更有利于优化低转扭矩
而twin turbo更适合发挥高转功率 |
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c*********r
发帖数: 19468 | 16 过去Honda在Civic Si这样的车上都能用高转引擎，是因为它有相对竞争优势。早个10
年，同一个市场区间的增压4缸机都不是直喷机，比如VW的1.8T，油耗上并没有比高转
的I4有什么优势，而且turbo lag也比较大，加之很多机型还有可靠性问题，所以Honda
的高转I4有它的比较优势。现在是turbo直喷机的时代了，压缩比已经足够高，turbo的
油耗优势就得以体现。同时随着twin-scroll turbo的流行（即使是single scroll，今
天的turbo排气歧管也都是做了分隔设计的）乃至排气歧管整合进缸盖、水冷中冷等的
技术新趋势，turbo lag控制得比过去成熟得多，turbo相对高转I4的优势也就越来越大
。这不，连Honda也开始为下代Civic Type-R准备turbo直喷I4了嘛，这个趋势基本上不
可逆转了。高转引擎较有希望守住的还是高端的跑车市场。 |
|
d******g
发帖数: 6966 | 17 碳大，他这个“pre-tensioned"是怎么实现的？
“Two mono-scroll turbochargers
Mitsubishi mono-scroll turbochargers
18.1 PSI / 1.25 BAR max peak
Pre-tensioned in Sport and Sport+ modes (keep spinning at a high rate of
speed even after throttle lift-off, for ultra quick response - more details)
Impulse charging for optimized responsiveness
Flow-enhanced manifolds
Electric wastegate actuator” |
|
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c*********r
发帖数: 19468 | 19 wiki上纯扯淡的东西多的是，拿wiki上的东西说事必须要谨慎……
twin scroll turbo响应的提高主要还是在于减少了排气间的干涉，写那条wiki的人自
己都没搞清楚twin scroll turbo的原理…… |
|
e***i
发帖数: 3894 | 20 家里新进了一辆F25 X3 28i，这样家里两个车都是用涡轮的了。虽然重量差的太多没法
比，可是引擎的感觉多少可以比较一下，闲扯两句。
N20也算是BMW这几年转型Turbo的拳头产品了，2.0 DI twin scroll turbo。参数网上
有咱就不说了，我感觉turbo lag真的是不明显，输出还挺线性的，更多的时候是变速
器不愿意降挡。42xx磅的车跑起来感觉不吃力。turbo的声音完全听不到，排气的声音
倒是不差，怠速有点柴油的感觉但是坐在车里的话觉得还好。不废油。
EJ255则是非常老套路的涡轮引擎，没有直喷，没有twin scroll，2.5的基础排量加上
一个IHI的大涡轮，turbo启动时候有恐怖的power surge。有turbo的啸叫，低速时候有
那种特低沉的声线。排气没有引擎声音大。只要踩的够狠，那喝油是刚刚的，当然如果
转数控制的好还是有谱的。 |
|
Y****a
发帖数: 17170 | 21
感觉好像lag太明显了。
tiguan是twin scroll 的turbo吗？
我觉得基于twin scroll 的turbo 好很多，正常开lag不大明显。 |
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p*********e
发帖数: 32207 | 22 ☆─────────────────────────────────────☆
felixcat (felixcat) 于 (Tue Jul 28 00:23:53 2009, 美东) 提到:
今天查了一下，发现自从有M cars以来，一直都是用自然吸气的发动机，就算现在它家
的turbo做得很好的情况下。这里面有什么缘由吗？
☆─────────────────────────────────────☆
DoomIII (HammerHeart) 于 (Tue Jul 28 00:25:18 2009, 美东) 提到:
显摆呗，老子NA都比你turbo榨油榨干了快
☆─────────────────────────────────────☆
michael8238 (michael8238) 于 (Tue Jul 28 00:57:07 2009, 美东) 提到:
下一代M5可能要用Twin Turbo了吧
☆─────────────────────────────────────☆
yeemartin (猪头) 于 (Tue Jul 28... 阅读全帖 |
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c*********r
发帖数: 19468 | 23 应该还是N55快，至少BMW官方是这么说的……原理上同样boost一个twin scroll比两个
single scroll也要更早介入，何况N55带Valvetronic，NA阶段油门响应快，应该对
turbo更早的介入有帮助 |
|
c*********r
发帖数: 19468 | 24 日常用EJ257也太老，还记得我以前贴的数据吗？即便和WRX的低输出FA20 DIT比，
EJ257也因为turbo lag的缘故，反应慢太多了，这方面不改直喷＋twin scroll turbo
是没办法的事……RS虽然还没实测，但它的2.3T毕竟是Ford第二代EcoBoost了，直喷＋
twin scroll turbo都有，再怎么说油门响应也不是EJ257能比的……
不过RS今年下半年才能投产，来美国要明年了，到时候STI说不定也换引擎了，这是个
不确定因素……如果STI换DIT引擎，我还是觉得它略胜半筹的…… |
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c*********r
发帖数: 19468 | 25 嗯，这个图很清楚了，一个twin scroll turbo
这个问题我之前就质疑过，如果是安排在320-330hp的样子，用单个twin scroll turbo
比twin turbo利大于弊
果然如我所料 |
|
c*********r
发帖数: 19468 | 26 其实新S4/5那台turbo V6还是不错的……在那个输出级别，用一个twin scroll turbo
可能比两个mono scroll turbo利大于弊，BMW在类似的区间的新引擎也是做的同样的选
择（B58、N55T0）
另外Audi的新V6独到之处相当多，比如从V8上继承了reverse flow的进排气安排，
turbo因此可以埋在V谷里，而且从新版EA888上借鉴了把排气歧管整合进缸盖的设计，
排气的设计真是紧凑……另外直喷系统也升级了，喷嘴移到了燃烧室中间，应该是和
BMW、MB一样是spray-guided的了，而他家之前的直喷一直是air-guided
sc |
|
c*********r
发帖数: 19468 | 27 当然不是twin-scroll，lag也确实应该比S4/5那台明显，不过这个事情不是这样看的
boost高的turbo引擎lag肯定会倾向于高一些
不同的turbo方案有自己的适用范围，如果Panamera用单个twin-scroll turbo达到
440PS的输出，lag会比twin turbo更高
反过来，如果S4/5如果非要上twin turbo，lag可能也会更高 |
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w*******y
发帖数: 60932 | 28 Apply coupon code = logi_mx5500_ 101310
Premium rechargeable laser mouseThe MX Revolution mouse features a motorized
, smart scroll wheel and rapid-charging rechargeabil ity
Dynamic keyboard displayWith the integrated LCD, you can play music, use the
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Bluetooth 2.0 technologyYou'll enjoy a reliable wireless connection from up
to 30 feet with virtually no interference . And it's pre-configured, so you
'll b... 阅读全帖 |
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w*******y
发帖数: 60932 | 31 All active duty military/reserve/veterans can get the following laptop new
from Dell for $880.83 with free shipping and no tax through AAFES.
First go to Link:
https://shop.aafes.com/shop/Default.aspx
and either log in or create a new account.
Then go to Computers -----> Notebooks
Then click on Specialty Store: Dell Notebook Assortment!
Then click on the *To shop Dell, please click here* area
A pop-up will pop up and you need to click on CONUS shipment
Scroll down and click on the ALIENWARE la... 阅读全帖 |
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w*******y
发帖数: 60932 | 32 Mobile Mouse Pro (Remote / Trackpad)
Application Description
Download the FreeAppADay Store App and wish for more top rated paid apps
like Mobile Mouse Pro to be FREE for a day! Mobile Mouse instantly
transforms your iPhone or iPod touch into an in air, wireless remote for
your computer! Sit back and use this remote to surf the web, browse your
photo library or control your music player from the comfort of your couch.
Mobile Mouse uses the built in accelerometer to translate your hand motions
in... 阅读全帖 |
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w*******y
发帖数: 60932 | 33 I received an email
Mystery eCoupon Ends Sunday! You could save up to 50% off ThinkPad laptops
link here:
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. You MUST sign on to see the deals, create new account if neccessary.
After sign on scroll to the eCoupon - Additional Savings.
Click on Deals on ThinkPad Edge icon on the left. You will see these deals
on the next page. Better deals when you scroll down to Reconmended session.
These are good deals. They are even better with My... 阅读全帖 |
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w*******y
发帖数: 60932 | 34 Mint is great, if you dont already have it this is a great time to get it.
Go to
Link:
http://my.ebay.com/ws/eBayISAPI.dll?MyEbayBeta&CurrentPage=Rewa
Scroll to the middle where you see "Earn Up To $30 Ebay Bucks", click on it
and scroll to the middle or so again to find the Mint.com Offer.
Important things to note; 1) new customers only, 2) must add at least 1
financial account
entire process should take you under 5 minutes.
Enjoy!
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w*******y
发帖数: 60932 | 37 Link:
http://itunes.apple.com/app/legendary-wars/id413423472?mt=8
LW is FREE for this weekend only; in celebration of our upcoming release of
Legendary Wars HD for Ipad!
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back!
Thank you to all our fans! We really appreciate Your fantastic reviews! New
content is on the way!
Coming Soon in V1.4 - You guys asked for it:
New Tier 4 Legendary Armor!
New ... 阅读全帖 |
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w*******y
发帖数: 60932 | 38 I've been waiting for a 17" for awhile and I didn't want to pay taxes. It
would have been nice to have the faster process and blueray that the dell
best buy deal of a few days ago but it wasn't worth an extra $200+ for me.
This is for my bedroom and as a desktop replacement. Stellar reviews on
compusa.com
Acer Aspire AS7741Z-4643 17.3" Notebook PC Memory Type: DDR3
Memory Slots (Total): 2
Total Memory Size: 3GB
Memory Slots (Available): 0
Maximum Memory Supported: ... 阅读全帖 |
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w*******y
发帖数: 60932 | 39 The description says the app is free today (regular price of $4.99).
Splashtop Remote Touchpad for iPhone:
http://itunes.apple.com/us/app/splashtop-remote-touchpad/id4143
Nice little app to use if you have a HTPC and don't want another remote
hanging around.
Requirements:Compati ble with iPhone 3GS, iPhone 4, iPod touch (3rd
generation), iPod touch (4th generation), and iPad.
Requires iOS 3.2 or later.
Description:
Turn your iPhone or iPod touch into a wireless touchpad and keyboard for
your PC... 阅读全帖 |
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w*******y
发帖数: 60932 | 40 $383.99 Purchase Includes:
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Since you are placing this on your Amazon Visa, you will get another 3% back
, so net cost of laptop and ... 阅读全帖 |
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w*******y
发帖数: 60932 | 41 Logitech G9x $49.99 (backordered) Link:
http://www.amazon.com/Logitech-Programmable-Laser-Gaming-Precis
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w*******y
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:shrug:
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Choose from these titles :
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Assassin's Creed: Revelations
Batman: Arkham City
Battlefield 3 Limite... 阅读全帖 |
|
