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全部话题 - 话题: angle
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w*******y
发帖数: 60932
1
Meritline
5-LED Angle Adjustable Cap Light
= $0.99 with code MLCK1122SNL1
5' 3.5mm to 3.5mm Aux Straight Cable for Apple iPod
= $0.65 with code MLCK1122SNL1
free shipping
g******y
发帖数: 2517
2
Spyderco Tri-Angle Sharpmaker Knife Sharpener 204MF,折扣56%
http://amzn.to/twi21w
w*******y
发帖数: 60932
3
Sears has the Craftsman Nextec Right Angle Impact Driver for 59.99 (Regular
Price is 99.99). They are also running a promotion for a free Nextec 12v
Cordless Drill/Driver. You will have to pay tax for both items (where
applicable), but when you add the drill to your cart, it'll ring up 0.00.
The only thing is the free drill doesn't come with a battery or charger,
however, you will be able to use the battery from the impact driver.
link for impact driver: Link:
http://www.sears.com/shc/s/p_10153_... 阅读全帖
w*******y
发帖数: 60932
4
Product Link:
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&s
Amazon Price is $280:
http://www.amazon.com/Panasonic-DMC-TS3-Waterproof-Stabilized-2
Product Highlights12.1MP Hi-Speed CCD Sensor
Waterproof to 40' (12m)
Shockproof at 6.6' (2m) Drop
Dustproof
GPS, Compass, Altimeter, Barometer Inc.
Leica 4.6x Wide-Angle 28-128mm Zoom Lens
1920x1080 Full HD Video
Very Fast Autofocus, Short Shutter Lag
2.7" LCD Monitor--230,000-Dot Resolution
Easy Upload for Facebook/YouTube
g******y
发帖数: 2517
5
DEWALT D28402K 4-1/2-Inch Small-Angle Grinder Kit, 60% off
http://amzn.to/uMjWLD
w*******y
发帖数: 60932
6
Samsung MV800 MultiView 16.1 Megapixels Digital Camera with 5x Optical Zoom
26mm wide angle Schneider lens $18.90 Free shipping from Adorama
Samsung MV800 MultiView 16.1 Megapixels Digital Camera:
http://www.adorama.com/ISGMV800.html
$18.90
w*******y
发帖数: 60932
7
Link:
http://www.sears.com/shc/s/dap_10153_12605_DAP_WOW Specials?adCell=BH
sears deal of the day, looks like you get the right angle imppact and free
drill for $49.99
12-12-11 only
g******y
发帖数: 2517
8
Canon PowerShot S95 10 MP Digital Camera with 3.8x Wide Angle Optical Image
Stabilized Zoom and 3.0-Inch LCD, 43% Off
http://amzn.to/vbCK7H
w*******y
发帖数: 60932
9
Loctek 14" 40" TV Articulating Wall Mount Bracket, Angle Free Adjustable
Tilt a (202-078-001)
Link:
http://www.meritline.com/loctek-psw711-14-40-plasma-lcd-tv-wall
Regular Price: $25.99
Final Price: $16.99
+ Free Shipping
Coupon Code: MLCK190ZNL1
w*******y
发帖数: 60932
10
5 LED Hat Clip Light, 3 Modes, with 2 Red Side Safe LED Light, Adjustable
Angle, NR904
Link:
http://www.meritline.com/led-hat-clip-light-nr904---p-51715.asp
$0.99 w/Code: MLCK121ANL1
w*******y
发帖数: 60932
11
Lowes has the DEWALT DW960B 18-Volt 3/8" Cordless Right Angle Drill for $35.
60. This is the tool only, no battery or charger. My store had it on the
shelf for $71.20 but had no problems matching the website price. This item
is also available for shipping in some areas. It appears to go for around $
99 at Home Depot and Amazon so this is a great price. It also has great
reviews.
Link to Lowes.com:
http://www.lowes.com/pd_31698-70-DW960B_?PL=1&productId=3191301
I will post the receipt later ... 阅读全帖
w*******y
发帖数: 60932
12
Link:
http://www.amazon.com/Sony-Cyber-Shot-DSC-W510-Wide-Angle-2-7-i
Price comparison:
http://www.google.com/products/catalog?q=Sony DSC-W510&hl=en&cid=1287058139446428834&os=sellers


quote



Product Features
26mm equivalent lens with 4x optical zoom
Capture breathtaking images in Sweep Panorama Mode
SteadyShot image stabilization reduces blur
iAuto mode automatically optimizes camera settings
Face Detection and Smile Shutter technologies
w*******y
发帖数: 60932
13
click me:
http://www.adorama.com/ICAE500BR.html?emailprice=t
great price for a compact camera with 24mm wide angle and 1080p video
$139 + free s/h
w*******y
发帖数: 60932
14
Tokina 11mm-16mm F/2.8 ATX Pro DX Autofocus Wide Angle Zoom Lens for for $
599 + free shipping after a $40 rebate:
http://iway.org/9560721
Canon:
http://iway.org/9560731
Nikon:
http://iway.org/9560741
Sony:
http://iway.org/9560751
Very good lens for very good price!
q*********u
发帖数: 9501
15
来自主题: _Stockcafeteria版 - 技术探索:Gann Angles
我们这里很多是TA的高手,大家对Gann Angles应该不陌生,实践中,我个人认为还是非常有价值的,大家探讨一下这个问题。
y*****i
发帖数: 887
16
再来个阿穆《娱乐无限Angle》拍摄花絮视频,供HC用~~
http://www.tudou.com/programs/view/L7rOwtrFCIA/
s**e
发帖数: 1834
17
来自主题: Mathematics版 - 想到一个有趣的数学题
现在接着part 1来补全余下证明,相对简单得多,
没太多技巧。
仍假设ABC(大三角形)再缩小
就不能覆盖A'B'C'(小三角形)了。
根据之前的结论1,2,现假设A与A'重叠,
且ABC与A'B'C'同向。
因为ABC不能再缩小,所以覆盖只能有以下几种可能。
(1)B'与B重叠
(2)B'在AB内部,C'在BC内部
(3)B'与C'都在BC内部
(4)(类似(2)),C'在AC内部,B'在BC内部
(5)C'与C重叠
现在取消ABC不能再缩小去覆盖A'B'C'这个限制,
从新解读以上五条,我们得到:
(1') AB>=A'B'; angle A >= angle A'; angle B >= angle B'.
(2') AB>=A'B'; angle A >= angle A';
AB*sin(B) >= A'C'*sin(A'+B).
(3') BC边的高 >= B'C'边的高; angle B <= angle B';
angle C <= angle C';
(4') AC>=A'C'; angle A >= angle A';
AC*sin(C) >= A'B'*sin(... 阅读全帖
r****1
发帖数: 4301
18
来自主题: astrology版 - 学习帖:占星警句100条 (zz)
占星警句(Choice Aphorisms)原文摘选自卡丹(Jerome Cardan 1501—1576)的着作《
Seven segments of Cardan》。卡丹被誉为16世纪的博学者,拥有数学家、物理学家、
医药学家、天文学家、及术士等多个头衔。在他的有生之年,他出版了多达54本着作和
44件手稿,内容涉及了他研究的各个领域。占星警句讲的是星盘分析的一些规则和条文
,按条目的方式列出,分为总论篇、命盘篇、推运篇、医疗篇、择时篇、蚀彗篇、气候
篇、农作篇、实事篇等9部分,论及范围着实广泛。不过,如果以条文的数目来看,命
盘篇是核心部分,共计100条,其它篇的内容相对少很多,可能是与删节有关。
在历史上的顶级占星名家中,还没有Cardan的位置,不知是不是他学识太杂的原因,
很多谈及他的资料均是与数学、人文科学或玄学相关,占星作为玄学,只是他学识中的
一小部分。根据有关资料的判断,占星警句很可能是他汇编成文的,其中有不少条文内
容是值得我们深入思考和借鉴的。
1、A Child is then said to be born when first it breathes in... 阅读全帖
x*******3
发帖数: 8342
19
来自主题: PhotoGear版 - lots of replacements.
35L f/1.4 LII
Canon files patent for EF 35 f/1.4L II
Patent Publication No. US 7,944,625
Published 2011.5.17
Filled 2009.8.5
Specifications
Focal Distance: 34.59
Fno: 1.45
Half angle of view: 32.02
Image Height: 21.64
Lens Length (mm): 126.93
Back Focus (mm): 37.98
50 1.4, why not mark II?????
Canon patent for EF 50 f/1.4 USM
Patent Publication No. 2011-70032
Published 2011.4.7
Filled 2009.9.25
Specifications
Focal Distance: 51.70
Fno: 1.30
Half angle of view: 22.79
Image Height: 21.64
Lens Leng... 阅读全帖
a*********3
发帖数: 660
20
定义 definition变量 variable面积 area直径 diameter半径 radius公式 formula
单价 unit price范围 range/scope/extent集合 set法则 principle本金 principal利
率 interest rate利息 interest单利 simple interest复利 compound interest正数
positive number负数 negative number解析式 analytic expression分类讨论
classified discussion性质 nature (不是很确定)奇函数 odd function偶函数
even function对称 symmetric坐标原点 origin单调性 monotonicity(不是很确定)
任意 random周期性 periodic 有界性 boundedness 数学 mathematics, maths(BrE)
, math(AmE) 公理 axiom 定理 theorem 计算 calculation 运算 operat... 阅读全帖
P*******l
发帖数: 4895
21
来自主题: WeddingBells版 - 钻石选择攻略 (ZT) (转载)
发信人: thlj (谈婚论嫁), 信区: wedding
标 题: Re: 钻石选择攻略 (ZT)
发信站: BBS 未名空间站 (Fri Apr 23 15:00:07 2010, 美东)
切工
圆钻的切工要最好,还是比较容易比较的。GIA近年切工打分越来越松了,3EX也不一定
够,下面是两个商家的best ideal cut的比例,只要各方面差不多的应该就问题不大。
我觉得全深比和台宽比一定要在严选里面。另外比较容易被忽略的是gridle。如果腰太
厚,可能这里就给你浪费好几分的石头,不划算的。毕竟其他数据都是令到光线最大可
能的被反射,但肉眼也不是光谱仪,差一点看不出来,腰就是实打实的钱了。
另外要注意是冠角和亭角,它们对钻石的闪耀度影响最大。根据数学计算,34.5度和40
.75度是最好的比例,但很难有钻石达得到,只要在严选范围内都不错。略微大的冠角
要配略微小的亭角,反之亦然,如下图所示。
(来自http://www.folds.net/diamond/index.html#girdle,里面有讲解)
下面来自wikipedia
The relationship betw... 阅读全帖
P*******l
发帖数: 4895
22
来自主题: WeddingBells版 - 钻石选择攻略 (ZT) (转载)
发信人: thlj (谈婚论嫁), 信区: wedding
标 题: Re: 钻石选择攻略 (ZT)
发信站: BBS 未名空间站 (Fri Apr 23 15:00:07 2010, 美东)
切工
圆钻的切工要最好,还是比较容易比较的。GIA近年切工打分越来越松了,3EX也不一定
够,下面是两个商家的best ideal cut的比例,只要各方面差不多的应该就问题不大。
我觉得全深比和台宽比一定要在严选里面。另外比较容易被忽略的是gridle。如果腰太
厚,可能这里就给你浪费好几分的石头,不划算的。毕竟其他数据都是令到光线最大可
能的被反射,但肉眼也不是光谱仪,差一点看不出来,腰就是实打实的钱了。
另外要注意是冠角和亭角,它们对钻石的闪耀度影响最大。根据数学计算,34.5度和40
.75度是最好的比例,但很难有钻石达得到,只要在严选范围内都不错。略微大的冠角
要配略微小的亭角,反之亦然,如下图所示。
(来自http://www.folds.net/diamond/index.html#girdle,里面有讲解)
下面来自wikipedia
The relationship betw... 阅读全帖
f**d
发帖数: 768
23
来自主题: Neuroscience版 - eBook: From computer to brain
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
z*t
发帖数: 13
24
来自主题: JobHunting版 - 问道google电面面经里的题
#include
struct point{double x, double y;};
void split(vector & v, point & line_point1, point & line_point2){
int n = v.size();
if(n==2){
line_point1 = v[0];
line_point2 = v[1];
return;
}
//get left most point
int left_index = 0;
for(int i=1;i if(v[i].x left_index = i;
}
//transform to angle
// angle and array index
vector > angle(n-1);
for(int i=0;i if(i==left_index)
contin... 阅读全帖
H******7
发帖数: 34403
25
这不装洗PP的东西么,Suppose把水管旋下来就行了。
看来是这样的:
This is ACCOR, one piece angle stop & water supply. They make them in Female
Thread or Push On types.
Close water to the house. Disconnect water supply from toilet tank. Put your
hand on angle stop and try to turn it clock wise. See if it spins around
the pipe it that direction. If positive, than it is Push On type angle stop.
It operates on same principle as SharkBite fittings. Go to Home Depot,
purchase 1/2" orange Removal Ring, slip that ring over the copp... 阅读全帖
t******l
发帖数: 10908
26
这事出有因是因为一道破题涉及到平行公理。于是俺就强调了一下平行公理是欧几里德
平面几何的核心,让娃上网查 Euclid's fifth postulate 后解释给俺听。
然后娃开始罗罗嗦嗦开始叙述 parallel 然后 angle 啥的。。。
俺一听 angle 就急了,说特么欧几里德又不是文科生说话那么罗嗦,你说的这个是
theorem of angles and parallel lines。。。平行公理就是“过直线外一点有且仅有
一条平行线”,你说的这些都可以从 postulate 开始证明。。。如果追求概念图景但
追求特别严格的扣牛角尖的话,这么整。。。
首先用平行公理证明四个直角的矩形存在。。。娃目瞪口呆说这也要证明, 我说废话
你们数学老师画了三个直角咋知道第四个一定是直角,然后我拿出一个排球说,看看排
球上的球面上矩形好了。。。
遂左膀往“角度”一路奔过去,可以证明娃你刚才说的 theorem of angles and
parallel lines。。。继续往下还可以证明三角形内角和是 180 度。。。娃又目瞪口
呆说这也要证明?我问你们数学老师证明过没有?娃想了想... 阅读全帖
C***1
发帖数: 2264
27
Back extension endurance and strength: the effect of variable-angle roman
chair exercise training.
Verna JL, Mayer JM, Mooney V, Pierra EA, Robertson VL, Graves JE.
U.S. Spine and Sport Foundation, San Diego, California, USA. d*****[email protected]
Abstract
STUDY DESIGN: A pre- and postintervention randomized, controlled trial was
conducted.
OBJECTIVE: To evaluate the effect of progressive resistance exercise
training using a variable-angle Roman chair on the development of lumbar
extensor endurance an... 阅读全帖
i*********5
发帖数: 19210
28
来自主题: Running版 - 评估自己的MaxHR
有人试过这个测试吗?
http://www.training2run.com/html/mhr_test.html
THE TEST: Step on the treadmill, running at 2 mph (miles per hour), and set
to an angle of 2%. Walk at this easy pace for three minutes. Unless you
have problems with balance, do not grasp the rails during any part of the
test.
At the end of the first three minutes, increase the speed to 3 mph, and the
angle to 4%.
At the end of the next three minutes, increase the speed to 4 mph and the
angle to 6%
After three more minutes, increase th... 阅读全帖
d*g
发帖数: 16592
29
来自主题: Tennis版 - 问个发球的站姿
http://www.fuzzyyellowballs.com/video-tennis-lessons/serve/adva
serve-technique/the-various-serve-stances/
In the serve fundamentals section of FuzzyYellowBalls, we suggested you
use the party stance when you were first learning the serve because it’s
a very simple stance and lets you execute all of the fundamentals of the
serve. Not only is it simple, but it is also effective. Many pros,
including Roger Federer, use the party stance. To quickly review, the
party stance is where your feet are ab... 阅读全帖
H**********y
发帖数: 7928
30
susan miller Horoscope for Aries:2日011年11月28日
Try not to let a business partner or important client get you down. You
might feel stuck in a rut or stalled in a negotiation with this person.
Perhaps he or she is making unreasonable demands, or you have come to the
realization that you might not be suited to work this closely together. Even
if this alliance has worn out its welcome, it doesn't mean you should allow
yourself to go into a funk over it. Keep your chin up!
susan miller Horoscope for A... 阅读全帖
p********y
发帖数: 5141
31
来自主题: Cycling版 - The Rules
Someone asked what the rules of bike jersey, and someone else point him to
this link. It is hilarious. Totally loved it! =D
------------------------------------------------------
THE RULES
http://www.velominati.com/the-rules/
by The Keepers / Jun 1 2009 / 6,291 posts
We are the Keepers of the Cog. In so being, we also maintain the sacred
text wherein lie the simple truths of cycling etiquette known as The Rules.
It is in our trust to maintain and endorse this list.
For those struggling to under... 阅读全帖
q*c
发帖数: 17993
32
来自主题: Outdoors版 - Zion NP探险随记
一到七月四号的大热天,我又跑到南犹他火辣辣的沙漠地带去了,去年我和Shrily去的
Arches 国家公园和Canyonlands 国家公园,今年伊没去,不知在哪里逍遥。Zion国家
公园与Arches,Canyonlands,Bryce Canyon这三个犹他附近的国家公园不同的是虽然
同处沙漠地带,Zion却有更丰富的河流和水源探险地。
第一天在Zion坐着公园里的旅游班车把每一个风景点都看了看,走了些半迈,一个迈,
两个迈的风景线,拍了些到此一游的照片,在Virgin river里玩了玩水。除了玩水,
Weeping rock我还比较喜欢。Weeping rock能一览峡谷远景,在炎热的夏天里是一块避
暑的清凉地。Zion 国家公园的山看着都很陡峭,直上直下的。石头看着手感不错,是
个攀岩的好手就想试一试的。不过倒没见到攀岩的人在岩石挂着,可能天气太热,太阳
太大,石头太烫了吧?!
话说无限风光在险峰,地面看风景看得不过瘾,我们跑山顶去看,跑谷底去看。在Zion
,正是山顶和谷底都有风景的地方。山顶就是Zion有名的Angle's Landing trail了。
据说这个Angl... 阅读全帖
q*c
发帖数: 17993
33
一到七月四号的大热天,我又跑到南犹他火辣辣的沙漠地带去了,去年我和Shrily去的
Arches 国家公园和Canyonlands 国家公园,今年伊没去,不知在哪里逍遥。Zion国家
公园与Arches,Canyonlands,Bryce Canyon这三个犹他附近的国家公园不同的是虽然
同处沙漠地带,Zion却有更丰富的河流和水源探险地。
第一天在Zion坐着公园里的旅游班车把每一个风景点都看了看,走了些半迈,一个迈,
两个迈的风景线,拍了些到此一游的照片,在Virgin river里玩了玩水。除了玩水,
Weeping rock我还比较喜欢。Weeping rock能一览峡谷远景,在炎热的夏天里是一块避
暑的清凉地。Zion 国家公园的山看着都很陡峭,直上直下的。石头看着手感不错,是
个攀岩的好手就想试一试的。不过倒没见到攀岩的人在岩石挂着,可能天气太热,太阳
太大,石头太烫了吧?!
话说无限风光在险峰,地面看风景看得不过瘾,我们跑山顶去看,跑谷底去看。在Zion
,正是山顶和谷底都有风景的地方。山顶就是Zion有名的Angle's Landing trail了。
据说这个Angl... 阅读全帖
D*******l
发帖数: 5462
34
这帖子是为网友发的,牛人就不用看了。
http://www.mitbbs.com/article_t/PhotoGear/32886007.html
快门这东西,可以说成一本书。
http://www.techniphoto.com/wiki/index.php?title=The_shutter_spe
The simple description
Use the inverse of the focal length as the minimum shutter speed to avoid
blurred pictures (i.e. 50mm -> max 1/50 sec)
"Executive summary"
There is a well known rule of thumb in the photographers' world that you
shouldn't use a shutter speed lower than the focal length. This rule is
coming from the 35mm film world. With s... 阅读全帖
t***e
发帖数: 2138
35
The boring explanation Here follow some technical explanations: First of all
, my deepest apologies to those not familiar with mathematicsor physics…
But the conclusions are very interesting…. (see at the end) I did some
serious thinking to understand the rule of thumb of using a shutter speed
equal to the inverse of the focal distance. Here are the results: first some
(half-serious) maths: Let's start with the basic definitions and
assumptions: To simplify the calculations, we assume we can mod... 阅读全帖
l*x
发帖数: 396
36
来自主题: PhotoGear版 - 300mm 全幅镜头 vs. 10X 望远镜
参考canon EF 50 vs EF 300, the ratio of Angle of View:
Diagonal: ~5.6 X
Horizontal: ~5.9 X
Vertical: ~5.9 X
Specifications Canon EF 50mm f/1.4 USM Lens
Focal Length Range 50mm
APS-C Sensor DSLRs Only? N
Lenses / Groups 7/6
Angle of View: Diagonal 46°
Angle of View: Horizontal 40°
Angle of View: Vertical 27°
Specifications Canon EF 300mm f/2.8 L IS II USM Lens
Focal Length Range 300mm
APS-C Sensor DSLRs Only? N
Lenses / Groups 16/12
... 阅读全帖
x********u
发帖数: 12
37
关于近期Fano流形上构造Kähler-Einstein度量的工作

最近公布的Fano流形上构造Kähler-Einstein度量的工作,是Kähler几
何近年来引人注目的进展,专家们正在验证。若验查无误,将证明丘成桐关于Fano流形
的构想与猜测是正确的。Donaldson的稳定性条件是其中的关键步骤,还需在代数几何
上把此概念搞清楚,这样丘猜测就为深刻理解Fano流形奠定了基础。由于近期发生了一
些混淆不清的事件,我们将相关工作的公开记录做了客观、学术的分析,望有助于澄清
事实。本文主要涉及文献的比较,阅读本文无需是专家,数学专业本科高年级学生或研
究生可读懂绝大部分。欢迎关于数学上的批评与指正。
本文分三个部分:
1) 陈-Donaldson-孙的报告与文章
2) 田的报告与文章
3) 结论
I. 陈-Donaldson-孙的报告与文章
在最近的一系列文章中,陈秀雄-Donaldson-孙崧(CDS)宣布解决了Kähler
几何中悬置多年的问题。
丘成桐猜测:设M为一紧致K... 阅读全帖
g****a
发帖数: 1520
38
【 以下文字转载自 WaterWorld 讨论区 】
发信人: xiaoshushu (songshu), 信区: WaterWorld
标 题: 关于近期Fano流形上构造KE度量的工作(转载)
发信站: BBS 未名空间站 (Sat Aug 31 10:30:12 2013, 美东)
关于近期Fano流形上构造Kähler-Einstein度量的工作

最近公布的Fano流形上构造Kähler-Einstein度量的工作,是Kähler几
何近年来引人注目的进展,专家们正在验证。若验查无误,将证明丘成桐关于Fano流形
的构想与猜测是正确的。Donaldson的稳定性条件是其中的关键步骤,还需在代数几何
上把此概念搞清楚,这样丘猜测就为深刻理解Fano流形奠定了基础。由于近期发生了一
些混淆不清的事件,我们将相关工作的公开记录做了客观、学术的分析,望有助于澄清
事实。本文主要涉及文献的比较,阅读本文无需是专家,数学专业本科高年级学生或研
究生可读懂绝大部分。欢迎关于数学上的批评与指正。
本文分三个部分:
1) 陈-Don... 阅读全帖
g****a
发帖数: 1520
39
【 以下文字转载自 WaterWorld 讨论区 】
发信人: xiaoshushu (songshu), 信区: WaterWorld
标 题: 关于近期Fano流形上构造KE度量的工作(转载)
发信站: BBS 未名空间站 (Sat Aug 31 10:30:12 2013, 美东)
关于近期Fano流形上构造Kähler-Einstein度量的工作

最近公布的Fano流形上构造Kähler-Einstein度量的工作,是Kähler几
何近年来引人注目的进展,专家们正在验证。若验查无误,将证明丘成桐关于Fano流形
的构想与猜测是正确的。Donaldson的稳定性条件是其中的关键步骤,还需在代数几何
上把此概念搞清楚,这样丘猜测就为深刻理解Fano流形奠定了基础。由于近期发生了一
些混淆不清的事件,我们将相关工作的公开记录做了客观、学术的分析,望有助于澄清
事实。本文主要涉及文献的比较,阅读本文无需是专家,数学专业本科高年级学生或研
究生可读懂绝大部分。欢迎关于数学上的批评与指正。
本文分三个部分:
1) 陈-Don... 阅读全帖
b******4
发帖数: 1873
40
来自主题: JobHunting版 - 时针和分针角度问题
是150题那本书里的吗?
Example: Given a time, calculate the angle between the hour and minute hands.
Approach: Start with an example like 3:27. We can draw a picture of a clock
by selecting where the 3 hour hand is and where the 27 minute hand is.
By playing around with these examples, we can develop a rule:
»»Minute angle (from 12 o’clock): 360 * minutes / 60
»»Hour angle (from 12 o’clock): 360 * (hour % 12) / 12 + 360 * (
minutes / 60) * (1 / 12)
»»Angle between hour and mi... 阅读全帖
b*******2
发帖数: 412
41
来自主题: Golf版 - 最近做的CLUB FITTING
铁杆的FITTING主要是看杆身长度,LIE ANGLE,FLEX,还有总体重量和挥重等。我挥杆
相对比较FLAT,所以LIE ANGLE比一般要平2-3度,这个LIE ANGLE一定要看动态的,而
不是站在那里量下身高和手腕到地面的距离就决定了的。杆身的总体重量和挥杆也很重
要,现在的铁杆一般是D0-D1的挥重,我自己更适合D3的。
比较TITLEIST AP2, CALLAWAY APEX, TAYLORMADE CB, MIZUNO MP-H4和不同SHAFT,我
更适合MIZUNO MP-H4, SHAFT是KBS tour C-TAPER LITE STIFF
参数以6号铁为例,实际LOFT是31度,长度是37in, lie angle 60 deg.挥重D3. KBS C-
TAPER LITE SHAFT比较适合我,手感很好,感觉可以用力而不失去控制,非常稳定。
TRACKMAN的参数:launch angle 19 deg, spin 4800 rpm, carry avg. 175 yd, 弹道
中高。H4的LOFT不算很STRONG。但手感挺好的。
WEDGE的FI... 阅读全帖
b*****e
发帖数: 5133
42
来自主题: GunsAndGears版 - 能不能请手枪老资格说一下GLOCK 的好
我这个自己没有Glock的说说吧。
可靠耐用的名声是实打实打出来的,最新四代有点不算太小的extracting/recoil
assembly问题,Glock一直在不紧不慢想办法解决,静观其变。三代Glock是最可靠的。
关于损耗件(主要是复进簧和其它弹簧)更换周期,Glock Armorer培训最早是说打坏了
再坏,看你这样不一定能打坏。过了几年改口说复进簧3000发一换,又过了几年说2500
一换。现在的四代Glock双弹簧复进簧好像延长了更换周期。更长的更换周期完全可以
,很多人也是这么做的,但弹力下降或自己改用弹力低的弹簧(比赛选手为了加快套筒
速度,使用装药稍微少些的子弹等),会对套筒座一些零件冲击过大容易过早损耗,比
如locking block后面的那个不算很粗的pin或者塑料件本身,这个在威力大点的型号中
更明显,毕竟Glock最初是为9毫米设计的,而美国执法部门多用威力上一个档次的.40S
&W,duty round JHP往往又比练习的FMJ更加hot点。我觉得9毫米普通FMJ可以大胆用,
其它威力大点的口径自己定期查看一下,2500-3000更换一次好像是过分保守... 阅读全帖
S********t
发帖数: 3431
43
来自主题: Ski版 - 这是mogul的什么滑法?
明白了,原来你讲的hip angulation里的angle,是指femur和upper body两条线在hip
处的夹角。我理解的是大腿femur跟铅垂线的夹角。其实跟我理解的也差不多,因为我
理解这个的时候心里已经假定了上身的inclination几乎为0或者尽量的小。
那么也就是说:
Angle(ski, snow) = upper body inclination + hip angle + knee angle
我想我们共同的认识是upper body inclination应该minimize
而knee angulation肯定是有限的。
然后我重新表达一下我之前的意思:
比起滑groomer,mogul里不需要set很高的Angle(ski, snow)来carve出wide&round的
turn,等价的说就是减小turn/corridor的width(+steering, -carving), 减小hip
angle,这样的好处是absorb的range可以得到增加,enable你能走更aggressive的路线。
说到底,就是有一个tradeoff,在身体的功能有... 阅读全帖
f**s
发帖数: 968
44
链接在此:
http://www.kenrockwell.com/tech/8mm-f35.htm
8mm f/3.5 Fisheye
Pro-Optic, Samyang, Rokinon, Bower &c. (2009-)
© 2010 KenRockwell.com. All rights reserved.
Intro Specs Performance Compared Recommendations
8mm f/3.5 Fisheye, Pro-Optic Nikon AI-s version. enlarge. ($290, Korean, no
filters, 13.8 oz./391g). This one came from this link to it at Adorama (also
specifically in Nikon, Canon EOS, Pentax/Samsung and Minolta Maxxum/Sony
mounts). It also comes branded as Bower, also specif... 阅读全帖
a*****g
发帖数: 19398
45
我的源代码在后面,大概是要画一个图,作个简单证明。
现在的情况是图、题目说明以及后面的证明都分行处理了,所有图的右边空了一大块。
我希望把一些字(比如题目部分)移动到那边去,比较节省地方。
不知道如何操作。(最笨办法是把那些字当作图片直接写进去)
\begin{picture}(120,100)
\put(0,50){\line(1,0){100}}
\put(0,56) {$R$}
\put(105,50) {$C$}
\put(0,50){\line(2,1){80}}
\put(0,50){\line(2,-1){80}}
\put(83,93) {$E$}
\put(80,90){\line(1,-2){20}}
\put(80,10){\line(1,2){20}}
\put(83,5) {$A$}
\end{picture}
$\overline{AR} \cong \overline{ER}$,
$\overline{EC} \cong \overline{AC}$
Is $ \angle E \cong \angle A$? Why?
\bigskip
Answer:... 阅读全帖
a*****g
发帖数: 19398
46
我的源代码在后面,大概是要画一个图,作个简单证明。
现在的情况是图、题目说明以及后面的证明都分行处理了,所有图的右边空了一大块。
我希望把一些字(比如题目部分)移动到那边去,比较节省地方。
不知道如何操作。(最笨办法是把那些字当作图片直接写进去)
\begin{picture}(120,100)
\put(0,50){\line(1,0){100}}
\put(0,56) {$R$}
\put(105,50) {$C$}
\put(0,50){\line(2,1){80}}
\put(0,50){\line(2,-1){80}}
\put(83,93) {$E$}
\put(80,90){\line(1,-2){20}}
\put(80,10){\line(1,2){20}}
\put(83,5) {$A$}
\end{picture}
$\overline{AR} \cong \overline{ER}$,
$\overline{EC} \cong \overline{AC}$
Is $ \angle E \cong \angle A$? Why?
\bigskip
Answer:... 阅读全帖
d*******o
发帖数: 493
47
来自主题: Statistics版 - 【包子】SAS 多个图在同一页
丫丫付包子最及时了,求长期包养。
library(gridBase)
library(lattice)
panel.piechart <-
function(x, y, labels = as.character(y),
edges = 200, radius = 0.8, clockwise = FALSE,
init.angle = if(clockwise) 90 else 0,
density = NULL, angle = 45,
col = superpose.polygon$col,
border = superpose.polygon$border,
lty = superpose.polygon$lty, ...)
{
stopifnot(require("gridBase"))
superpose.polygon <- trellis.par.get("superpose.polygon"... 阅读全帖
p*********e
发帖数: 32207
48
来自主题: _Auto_Fans版 - 这CV joint好呀!!
看了一下wiki的介绍
"
Thompson coupling[edit]
Thompson coupling from U.S. Patent 7,442,126. Note: drawing on the right
omits certain components in order to illustrate the control yoke's spherical
pantograph.
The Thompson constant velocity joint (TCVJ), also known as a Thompson
coupling, assembles two cardan joints within each other to eliminate the
intermediate shaft. A control yoke is added to keep the input and output
shafts aligned. The control yoke uses a spherical pantograph scissor
mechanism to bi... 阅读全帖
G*******n
发帖数: 6889
49
The Captor-E will feature an innovative “re-positioner” with two rotating
joints so that the array can cover a wide field of regard (WFoR).
electronic scan angle + pointable gimbal-mounted mechanical scan angle =
wider angle of view vis-a-vis fixed AESA
"AESA And Typhoon
Posted by Bill Sweetman at 2/19/2009 10:24 AM CST
Everyone buying fighters wants an active electronically scanned array (AESA)
these days, no doubt after reading Dave "Mr AESA" Fulghum on the subject.
But Eurofighter remains war... 阅读全帖
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