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j*****g
发帖数: 463 | 2 在用 LS-DYNA 做一 Penetration 问题.
就拿穿地弹打比方吧, 穿过一层混凝土, 再钻到土里.
哪位大侠有类似数值模拟经验, 希望能交流交流.
大多数软件说起别的都牛皮哄哄, 一提 penetration
就顾左右而言它了.
我现在用 LS-DYNA 3D, Surface to Surface Eroding contact
处理 penetrating 问题. 但结果很不理想.
1. 被穿透的材料 (外面的硬壳, 里面的软土) 用什么
材料模型比较好? 我现在用的是 Elastic_Fail
2. 弹我现在用的是 rigid body, 若考虑弹的破坏呢, 用啥比较好?
3. 准备引入 Adaptive Mesh. 3D Adatptive Mesh 是不是
很耗资源啊?
请高人指点, 也可以私人信箱讨论, 谢谢. |
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c**i
发帖数: 6973 | 4 【 以下文字转载自 Sex 讨论区 】
发信人: choi (choi), 信区: Sex
标 题: Good Sex: Timing Penetration
发信站: BBS 未名空间站 (Mon Aug 25 11:16:59 2008)
For those who don't know, "penetration" is the medical term.
The following study is half a year old. But I did not learn of it until
today, when a local daily tabloid presented it in the lower left corner as
an interesting statistic--much as USA Today.
Good sexual intercourse lasts minutes, not hours, therapists say. Penn.
State Live, Mar. 31, 2008.
http://live.psu.edu/story |
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H*****d
发帖数: 37 | 5 http://www.youtube.com/watch?v=LbbpulPnwiU
22LR, 45ACP(with +P FMJ), 9mm(FMJ, JHP) all FAILED to penetrate.
Only one succeeded in full penetration is 9mm with Winchester +P+ Ts.
Winchester makes good stuff. Stay away from federal ammos (including their
target ones in Walmart, pointless to purchase as they are underpowered,
inaccurate and quite dirty). |
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D***a
发帖数: 516 | 6 这两天突然对Cell Penetrating Peptide产生了兴趣，看了一点综述，了解了Tat等多
肽序列可以将蛋白递送到细胞内。由此想到丁胜的蛋白诱导iPS，看了一下那篇文章，
的确也用了这个方法。
版上多次提及丁胜的这片文章不可信，那么疑点是在哪里？是Cell Penetrating
Peptide的效率不高，还是其他问题？谢谢。 |
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x*****n
发帖数: 3422 | 7 "The April/May 2007 edition of Machinist's Workshop did a test of
penetrating oils where they measured the force required to loosen rusty test
devices. Buy the issue if you want to see how they did the test. The
results reported were interesting. The lower the number of pounds the better
. Mighty interesting results for simple acetone and tranny fluid!
Penetrating oil . Average load .. Price per fluid ounce
None ................. 516 pounds .
WD-40 .............. 238 pounds .. $0.25
PB Blaster . |
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w*******y
发帖数: 60932 | 8 I been looking around for a good deal on Kroil penetrating oil and I found
this link. It offers 2 cans of aerokroil (13oz) for $12 with no shipping fee
. Their regular price is $13/can + shipping. I've run several search on this
forum and did not find a post on this deal before, so I appologize if this
is a repost.
Link:
http://www.kanolabs.com/late/
BTW, for those who haven't heard of "Kroil" before, it's the best (IMO)
among all penetrating oil. It outperforms WD40, PB Blaster, Liquid Wrench..... 阅读全帖 |
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d***h
发帖数: 97 | 9 F-35B Put On Probation; New Bomber To Go Forward
By Bill Sweetman w**************[email protected]
WASHINGTON
Defense Secretary Robert Gates has put the U.S. Marine Corps’ troubled F-
35B short-takeoff-and-vertical landing (Stovl) Joint Strike Fighter on “
probation,” while endorsing the U.S. Air Force’s long-coveted new bomber
program.
The F-35A and F-35C models emerged unscathed from Gates’ review. However,
the F-35B “is experiencing significant testing problems,” Gates said at
the Pentagon J... 阅读全帖 |
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l*y
发帖数: 21010 | 10 【 以下文字转载自 Sex 讨论区 】
发信人: ldy (大才001), 信区: Sex
标 题: 人体蜈蚣是男人唯一一种体验double penetration的机会
发信站: BBS 未名空间站 (Thu Jan 2 10:13:54 2014, 美东)
well，maybe not the only one, but should be the most practical one. |
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m****p
发帖数: 865 | 11 张飞行军,遇一河,生有怪鱼专食男根,众军士苦之,逡巡不敢渡.
飞起急智,命众军士列一直队,后列者深植其根于前股中,鱼贯渡河,仅损一鸡而全万鸡.
皇叔闻而赞之:何言翼德一莽夫哉,素有奇智
丞相孔明抚扇笑曰: 固善, 然终损一鸡, 何如环而插之,全身而渡?
这个才是double penetration 吧。 |
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W*****B
发帖数: 4796 | 12 3P时候double penetrate很爽的
：3P自己老婆 |
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G*********a
发帖数: 113 | 14 刚建的房子，搬进去没几天，然后下了大雨，发现地下室有一些。给builder打了电话
，说是foundation pipe penetration. Builder找人补了一些waterproof cement，说
可以seal。
请问新房一般会有这样的问题吗？这个到底严不严重？有什么好的办法让它也后不漏呢
？谢谢！ |
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F*********o
发帖数: 351 | 15 我买的是 definity deep penetrating foaming moisturizer,不是UV,是不是upc不一样？
这个
打电
话可以问upc？谢谢！ |
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B******Z
发帖数: 9193 | 16 请告诉我我不是唯一一个把title看成“double penetration”的。。。 |
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B********e
发帖数: 10014 | 17 我看的是tripple penetration... |
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i**e
发帖数: 6810 | 18 一直以为9mm 家防 over penetration小一点，看来不一定 |
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x*******1
发帖数: 28835 | 19 大家最熟悉的火箭队就是tripple penetration, 高位P& R。 不断的突破，然后kick-
out. 其实突破不可怕，可怕的就是突破的队员有单挑中锋的能力，或者pick 以后，投
3分。就像james harden, 可以pick对方防守队员以后，一步3P。 或者就是突进去，靠
欧洲步造犯规或者上篮得分，如果对方有布防就kick-out给外线（底角或者45度）。
火箭关键还有2个可以突破，lin/parsons. 2个都有外线投射能力，这个时候就可以选
择2次突破，或者射篮。反复的突分。
大家就奇怪，如果triple pene这么有效，为啥火箭年年争第9。 其实这是防的住的，
就是突破的时候， 弱侧一定要来造charge，或者block shot. nba的大前锋弹跳能力都
很强，上篮就没那么容易了。 防当差的时候，小个怎么fight pick很重要。jeremy
lin 就很差。从前绕还是从后，很讲究。 |
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G****e
发帖数: 487 | 20 it's dribble penetration ............ |
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t**n
发帖数: 58 | 21 要找个公司做penetration testing 。。谁有这方面的信息 |
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z**h
发帖数: 224 | 22 【 以下文字转载自 Chemistry 讨论区,原文如下 】
发信人: zzwh (微尺度爱情), 信区: Chemistry
标 题: can IR penetrate 1mm silicon wafer
发信站: Unknown Space - 未名空间 (Fri Apr 22 19:40:56 2005) WWW-POST
coated some thin film on silicon wafer, can I use transmission mode instead of
reflectance?
Thanks |
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a*****3
发帖数: 601 | 23 请教penetration analysis时,如何得到‘market’的信息？ 比如，可以知道本公司购买某产品（比如，某种汽车）所有不同年龄段人群的比例，那么如何得到整个市场购买类似产品 不同年龄段的比例？ 这个信息怎么得来？
宋老师，四人非兽知道答案的说说，20伪币。 |
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e***s
发帖数: 1397 | 25 Summary: Best choice is 12GA pump shotgun, loaded with #1 buckshot.
http://www.firearmstactical.com/briefs10.htm
Shotgun Home Defense Ammunition
(Tactical Briefs #10, October 1998)
For home defense, a shotgun is superior to a handgun in terms of being able
to stop a violent intruder as quickly as possible. A reliable, well-made,
pump-action shotgun can usually be purchased for less than the cost of a
handgun of comparable quality. Also, inexpensive birdshot ammunition,
typically used for trainin... 阅读全帖 |
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d*****n
发帖数: 908 | 26 HANDGUN AMMUNITION:
SELF DEFENSE
Ammunition manufactured in the United States is among the finest in the
world. For intended defensive uses, the gun owner will not go wrong in
selecting ammunition produced by the most widely recognized manufacturers.
These include CCI/Speer, Cor-Bon, Federal, Remington, and Winchester.
Allow no margin for error in protecting one's life. Avoid potentially
unreliable ammunition that is hand loaded, re-loaded, or of dubious quality
foreign manufacture when ch... 阅读全帖 |
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f*********n
发帖数: 11154 | 27 http://handgunsmag.com/ammunition/loads_for_snub_nose_revolvers_111610/index.html
......
However, velocity loss is quite significant with a two-inch barrel, and as
velocity diminishes, bullet expansion decreases and penetration increases.
Therefore, the most important question for the pocket revolver owner is,
Just how good, terminally speaking, is the fodder occupying the cylinder?
......
The test platform was a Crimson Trace laser grip-equipped S&W Model 49
Bodyguard. I engaged one m.o.a. dots... 阅读全帖 |
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s**********8
发帖数: 25265 | 28 Sterilization (microbiology)
http://en.wikipedia.org/wiki/Sterilization_(microbiology)
From Wikipedia, the free encyclopediaJump to: navigation, search This
article has multiple issues. Please help improve it or discuss these issues
on the talk page.
It may need reorganization to meet Wikipedia's quality standards. Tagged
since March 2008.
It is in need of attention from an expert on the subject. WikiProject
Microbiology may be able to help recruit one. Tagged since December 2010.
Contents [hide... 阅读全帖 |
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f********t
发帖数: 4574 | 30 看了一下wiki上5.56的简介，它的杀伤力还真有问题
http://en.wikipedia.org/wiki/5.56x45mm_NATO#Performance
Criticism
There has been much criticism of the poor performance of the bullet on
target, especially the first-shot kill rate when the muzzle velocity of the
used firearms and the downrange bullet deceleration do not achieve the
minimally required terminal velocity at the target to cause fragmentation.[
14] This wounding problem has been cited in incidents beginning in the first
Gulf war, Somalia, and in the curre... 阅读全帖 |
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r***6
发帖数: 401 | 31 Dr. Ed Ashby has some extensive archery hunting research.
Here is the analysis on broadhead performance:
http://www.alaskabowhunting.com/Ashby-Broadhead-Performance-W15
Summary:
1. Many broadheads are too fragile, bending or breaking on impact, thus
limiting penetration.
2. Rigid single blade broadheads are the least prone to damage on impact.
3. The most lethal shot angle is with the animal quartering away from the
archer.
4. The least lethal shot angle is with the animal quartering towards th... 阅读全帖 |
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y****i
发帖数: 1050 | 32 The first appearance of the Tiger on the Eastern Front was unsuccessful. The
first Tigers were issued to the 1st platoon of the 502 Battalion of Heavy
Tanks (Schwere Panzer Abteilung 502). On the 29th of August 1942, the four
Tigers arrived at the Mga railway station near Leningrad. Early that day,
the tanks were unloaded and prepared for battle. At 11:00 AM, the Tigers
went into their battle positions. Major Richard Merker commanded the platoon
, which included four Tigers, six PzKpfw III Ausf.... 阅读全帖 |
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y****i
发帖数: 1050 | 33 The first appearance of the Tiger on the Eastern Front was unsuccessful. The
first Tigers were issued to the 1st platoon of the 502 Battalion of Heavy
Tanks (Schwere Panzer Abteilung 502). On the 29th of August 1942, the four
Tigers arrived at the Mga railway station near Leningrad. Early that day,
the tanks were unloaded and prepared for battle. At 11:00 AM, the Tigers
went into their battle positions. Major Richard Merker commanded the platoon
, which included four Tigers, six PzKpfw III Ausf.... 阅读全帖 |
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y****i
发帖数: 1050 | 34 The first appearance of the Tiger on the Eastern Front was unsuccessful. The
first Tigers were issued to the 1st platoon of the 502 Battalion of Heavy
Tanks (Schwere Panzer Abteilung 502). On the 29th of August 1942, the four
Tigers arrived at the Mga railway station near Leningrad. Early that day,
the tanks were unloaded and prepared for battle. At 11:00 AM, the Tigers
went into their battle positions. Major Richard Merker commanded the platoon
, which included four Tigers, six PzKpfw III Ausf.... 阅读全帖 |
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m*****e
发帖数: 1506 | 35 2017 Minnesota Statutes
609.3451 CRIMINAL SEXUAL CONDUCT IN THE FIFTH DEGREE.
Subdivision 1.Crime defined. A person is guilty of criminal sexual conduct
in the fifth degree:
(1) if the person engages in nonconsensual sexual contact; or
(2) the person engages in masturbation or lewd exhibition of the genitals in
the presence of a minor under the age of 16, knowing or having reason to
know the minor is present.
For purposes of this section, "sexual contact" has the meaning given in
section 609.341... 阅读全帖 |
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g*********r
发帖数: 1443 | 36 今天学了点新知识，和大家分享：
Reflection, Refraction, and Color
The uppermost, sunlit layer of the ocean where 70 percent of the entire
amount of photosynthesis in the world takes place is called the euphotic
zone. It generally extends to a depth of 100 meters (330 feet). Below this
is the disphotic zone, between 100 and 1,000 meters (330 and 3,300 feet)
deep, which is dimly lit. Some animals are able to survive here, but no
plants. Although the amount of light is measurable at this range of depths,
there is ... 阅读全帖 |
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a**6
发帖数: 106 | 37
From what I have read so far, there are many wrong perceptions about the
shotgun shell penetration and pattern posted here.
First, it needs penetration. The projectile needs to penetrate no less than
12" to reach bad guy's major vital and central nerve system effectively
disabling the bad guy immediately. FBI and ammo manufactures had spent
millions of dollar on researches and testing to come up with the effective
12"-18" penetration guideline. SemperFortis has provided a very useful
penetrati... 阅读全帖 |
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S*********g
发帖数: 24893 | 38 Sodomy
From Wikipedia, the free encyclopedia
Sodomy (/ˈsɒdəmi/) is any non-penile/vaginal copulation-like
act, such as oral or anal sex, or sex between a person and an animal.[1] The
word is derived from the story of Sodom and Gomorrah in chapters 18 and 19
of the Book of Genesis in the Bible.[1] So-called "sodomy laws" in many
countries criminalized not only these behaviors, but other disfavored sexual
activities as well, but in the Western world, many of these laws have been
ove... 阅读全帖 |
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h*********2
发帖数: 2508 | 39 有点长，但是挺好玩
After some years now of reading internet bulletin boards, I think I’ve got
the pros and cons of possible SHTF rifle choices figured out. Correct me if
I’m wrong, but the following is my analysis based upon the wisdom of
numerous gun board gurus (you know them, they’re always the first ones to
tell you a particular model gun is “junk” and enlighten you as to why they
have made the only logical purchases)…
The AR 15:
Great, awesome, unbelievable rifle(when it works). Can hit a fly in the... 阅读全帖 |
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r*********e
发帖数: 7733 | 40 转发
Testing out some different types of ammo in the M&P Shield 9mm in the clear
ballistics gel block. Here's the data:
Remington UMC 115g:
Penetration-18.5''
Expansion-.51
Power- 1069 FPS, 292 FT/LBS Energy
Retained weight--112 grains
Federal HST 124gr
Penetration-13.5''
Expansion-.63''
Power- 990 FPS, 270 FT/LBS Energy
124 grains retained weight
Winchester Ranger 115
Penetration- 16''
Expansion-.57
Power-989 FPS, 250 FT/LBS
114grains Retained Weight
Gold Dot +p
Penetration-15.5''
Expansion-.61''... 阅读全帖 |
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y****i
发帖数: 1265 | 41 【 以下文字转载自 Biology 讨论区 】
发信人: yweili (杨威利), 信区: Biology
标 题: 据说哈利波特上nature了
发信站: BBS 未名空间站 (Thu Jan 6 14:13:20 2011, 美东)
发信人: Isaiah (SKIASONARANHR), 信区: Emprise
标 题: 据说哈利波特上nature了
发信站: 水木社区 (Thu Jan 6 09:19:54 2011), 站内
http://blog.renren.com/share/225423167/4622536314
刚看了《哈利波特7上》，无聊的在PubMed里面用"Harry Potter"做关键词搜索文献，
得到32篇文献，居然还有发在Nature上的文章两篇 还有其他牛文若干篇。灰常的欢乐。
附该文章链接： http://www.ncbi.nlm.nih.gov/pubmed/16094345
以免大家以为是我胡诌。最近真是闲的蛋疼。
==========================神==作==分==割==线====================... 阅读全帖 |
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y****i
发帖数: 1265 | 42 发信人: Isaiah (SKIASONARANHR), 信区: Emprise
标 题: 据说哈利波特上nature了
发信站: 水木社区 (Thu Jan 6 09:19:54 2011), 站内
http://blog.renren.com/share/225423167/4622536314
刚看了《哈利波特7上》，无聊的在PubMed里面用"Harry Potter"做关键词搜索文献，
得到32篇文献，居然还有发在Nature上的文章两篇 还有其他牛文若干篇。灰常的欢乐。
附该文章链接： http://www.ncbi.nlm.nih.gov/pubmed/16094345
以免大家以为是我胡诌。最近真是闲的蛋疼。
==========================神==作==分==割==线==========================
在下面第一篇nature文章中，在2005年《哈里波特与混血王子》出版后，来自澳大利亚
皇家儿童医院的Graig等人，同样对哈里波特中描述的有超能力的巫师wizards and
witches与麻瓜muggle结合后，后代属性问... 阅读全帖 |
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M*****u
发帖数: 144 | 43 一个几万块的小condo，现在检查报告出来了。请大家帮我看看有没什么问题。计划居
住2-3年。
我现在最大的concern就三条：
1. Water penetration behind guest bath room.
卫生间漏水，房间里没有事情，但是一使用就漏到外面走廊上去了。
我的comment: Please fix it and provide licensed plumber receipt and
warranty
.
2. Water leakage under bath sink and evidence of water penetration on
exterior wall and entry.
卫生间的洗手盆下面滴水，这个问题不是很大，但是结合上一条看，觉得还是要修修，
因为不知道问题究竟是哪里。
我的comment: Please fix it and provide licensed plumber receipt and
warranty
.
3. No water for the dishwasher.
据说是没有接上connection，只是新... 阅读全帖 |
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b****r
发帖数: 17995 | 44 http://thefiringline.com/forums/showthread.php?t=311160
“I know I will more that likely hear from Glenn about flawed data , but in
general
my file folder says #4, #5, #7, #8 shot at 15 ft seems to penetrate 2 to 4
sheets of
standard sheetrock. 00 Buck at the same distance seems to penetrate 7 to 9
sheets of
standard 1/2" sheetrock. At 30 ft #4, #5 seemed to penetrate 1 sheet of
sheetrock, #7
#8 penetrated 0 sheets of sheetrock, and 00 seemed to penetrate 5 to 6
sheets of
sheetrock. Our boxes wer... 阅读全帖 |
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h******d
发帖数: 4761 | 45 9 mm Stopping Power, all bullet weights
Brand Bullet Shootings One Shot Stops Percent Diameter
Penetration Notes
Federal 124 gr HS 243 202 83% 0.67" 14.5"
Federal 124 gr Nyclad 265 220 83% 0.69" 14.3"
Winchester 115 gr ST 421 349 83% 0.64" 13.7"
Remington 115 gr JHP 265 217 82% 0.58" 14.3"
Federal 115 gr JHP 382 317 82% 0.56" 13.6"
Federal 124 gr Nyclad 44 3... 阅读全帖 |
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s******9
发帖数: 1451 | 46 一些枪友知道，俺每日不离身的CCW是Kel-Tec P32。这是受一位曾任特种部队教练的老
美朋友影响。弹药现在我用：Buffalo Bore .32 ACP +P 75 Grain Hard Cast Flat
Nose。刚好看到油管上有个测试，恰是我EDC的这个枪弹组合，观后更印证了俺每日携
带这个组合的决定之正确。呵呵。
http://www.youtube.com/watch?v=WrKDnLLUd-Y
这个视频里，测试者很特别的在凝胶前放厚约一英寸的16层牛仔布（一般只用4层），
子弹穿透凝胶距离仍达至少14.5英寸（在此深度从凝胶侧面飞出--可能在凝胶内翻滚了
？）。FBI 的要求是至少12英寸。而按照IWBA的要求，甚至还有点overpenetrate。以
下是从wikipedia 上关于Stopping Power 摘下来的一段话：
According to Dr. Martin Fackler and the International Wound Ballistics
Association (IWBA), between 12.5 and 14 inches (3... 阅读全帖 |
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