T**********e
发帖数: 29576 | 1 Many library collections use special equipment, such as special gloves and
climate-controlled rooms, to protect the archival materials from the visitor
. For the Pierre and Marie Curie collection at France's Bibliotheque
National, it's the other way around.
That's because after more than 100 years, much of Marie Curie's stuff – her
papers, her furniture, even her cookbooks – are still radioactive. Those
who wish to open the lead-lined boxes containing her manuscripts must do so
in protective clo... 阅读全帖 |
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d*******3
发帖数: 8598 | 2 【 以下文字转载自 Physics 讨论区 】
发信人: Jerry0803 (Jerry and Tom), 信区: Physics
标 题: 【转载】漫谈物理学的过去、现在与未来 冯端
发信站: BBS 未名空间站 (Sat May 10 22:33:04 2014, 美东)
漫谈物理学的过去、现在与未来*
冯 端
摘 要 文章试图对物理学的发展历史作一透视，从而理解其现状，并进而窥测其未
来的前景.我们希望这一看法对于当今从事物理学教学与科研的人士有所助益.由于物理
世界的层次化，诸层次之间既可能存在耦合，又可能出现脱耦.因而大量粒子所构成的
复杂体系中所涌现的各种层展性质就不能简单地还原成个别粒子所服从的规律.我们根
据这一观点并结合物理学的未来前景，讨论了当今物理学研究的若干前沿问题.一切迹
象预示着物理学将有光明的前景.
关键词 物理学，历史，现状，前景，前沿，物理世界的层次化，层展性质
RAMBLING ABOUT THE PAST,PRESENT AND FUTURE OF PHYSICS
Feng Duan
(Department of Physics,Naj... 阅读全帖 |
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w*********r
发帖数: 42116 | 3 https://www.washingtonpost.com/news/worldviews/wp/2016/02/22/which-county-
has-worse-air-china-or-india/
The country with the worst air pollution is not the one you’re thinking of
It’s a never-ending debate in Asia -- whose air quality is worse, China’s
or India’s? A new study by Greenpeace released Monday is trying to answer
that question.
Analysts looked at NASA satellite images and found that measurements of
particulate matter -- the microscopic particles that invade your lungs and
can cause ... 阅读全帖 |
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G*******n
发帖数: 6889 | 4 http://gbtimes.com/china/china-racing-make-2020-launch-window-m
Andrew Jones
2016/02/22
Mars Exploration Rover Spirit captures a stunning view as the sun sank below
the rim of the Gusev crater on Mars on May 19, 2005.Mars Exploration Rover
Spirit captures a stunning view as the sun sank below the rim of the Gusev
crater on Mars on May 19, 2005. (Photo: NASA/JPL/Texas A&M/Cornell)
Tags:
China's space programMarsNational Space Science CenterChina Aerospace
Science and Technology CorporationEur... 阅读全帖 |
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e*******n
发帖数: 4912 | 5 高能物理的绝唱
作者是王孟源，哈佛高能物理博士
现代高能物理始於1940年代的量子场论（Quantum Field Theory），最初的应用是以
量子电动力学（Quantum Electro-Dynamics，QED）来解释电磁力。
在1950年代，加速器的技术突飞猛进，数以百计的高能粒子被发现；物理学家在整理
这些粒子的时候，注意到各种对称性（Symmetry），其中最深奥困难也最重要的是规范
对称性（Gauge Symmetry）。其实QED本身就是一个规范场论，但是它只是规范场论中
最简单的一种，叫可交换规范场论（Abelian Gauge Theory）。
1954年，杨振宁和他的学生Robert Mills解决了非交换规范场论（Non-Abelian
Gauge Theory）的难题，高能物理理论界随即注意到用非交换规范场论来解释弱作用力
和强作用力（宇宙中只有四种作用力：电磁力、弱作用力、强作用力和重力）的可能，
但是具体的细节还不清楚。
1961年，当时在哈佛大学物理系的Sheldon Glashow领悟到电磁力和弱作用力如何混
... 阅读全帖 |
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发帖数: 1 | 6 http://mobile.abc.net.au/news/2016-03-24/china's-cancer-rates-exploding-study-says/7272266
In China, cancer rates are exploding and for the first time the extent has
been revealed.
Last year, more than four million people were diagnosed with the disease and
nearly three million died from it, research from the American Cancer
Journal of Clinicians showed.
In some of the industrial provinces, lung cancer rates have increased a
staggering four-fold, but authorities seem reluctant to acknowledge — l... 阅读全帖 |
|
x****6
发帖数: 4339 | 7 "a random matrix (sometimes stochastic matrix) is a matrix-valued random
variable—that is, a matrix some or all of whose elements are random
variables. Many important properties of physical systems can be represented
mathematically as matrix problems. For example, the thermal conductivity of
a lattice can be computed from the dynamical matrix of the particle-particle
interactions within the lattice"
the
正。 |
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t******l
发帖数: 10908 | 8 我觉得是我高中时的贝叶斯定理没真正理解，只是套公式把考试给对付了。。。这个是
我自己高中数学没学好的问题，我得先给自己补课高中贝叶斯定理的真正意义，回头再
想其他的。
: "a random matrix (sometimes stochastic matrix) is a matrix-valued
random
: variable—that is, a matrix some or all of whose elements are random
: variables. Many important properties of physical systems can be
represented
: mathematically as matrix problems. For example, the thermal
conductivity of
: a lattice can be computed from the dynamical matrix of the particle-
particle
: interac... 阅读全帖 |
|
t********1
发帖数: 266 | 9 https://en.wikipedia.org/wiki/Uncertainty_principle
“asserting a fundamental limit to the precision with which certain pairs of
physical properties of a particle, known as complementary variables, such
as position x and momentum p, can be known”
彼此彼此 :)
这个更能说明是我们这个时代测量手段的局限吧，我们找不到一个合适的“标尺”：尺
度上比这个particle小，运行速度／能量级上又比它高。
就像古人无法测定抛石机上某一个石头的轨迹和能量， 而当代人利用高速摄影和牛顿
物理就能简单解决问题一样。 |
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x****6
发帖数: 4339 | 10 下面是1998年到现在的屋里炸药奖，除中微子外，2008， 2004，1999这几年难道不是
你说的基本粒子或相互作用吗？
2008
Yoichiro Nambu
"for the discovery of the mechanism of spontaneous broken symmetry in
subatomic physics"
Makoto Kobayashi and Toshihide Maskawa
"for the discovery of the origin of the broken symmetry which predicts the
existence of at least three families of quarks in nature"
2004
David J. Gross, H. David Politzer and Frank Wilczek
"for the discovery of asymptotic freedom in the theory of the strong
interaction"
1999
Gerardus 't H... 阅读全帖 |
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|
w*p
发帖数: 16484 | 12 It's difficult to convey how oppressive Delhi's air pollution is.
Morning visibility is a couple of hundred metres. Through the eerie filtered
light, figures emerge from and disappear into the gloom.
Some wear masks or handkerchiefs, most blithely dismiss the apocalyptic
atmosphere, shrugging it off as "just fog".
Except it isn't.
Last Wednesday, central New Delhi's count of harmful PM2.5 particles
exceeded a staggering 1,000 on the US EPA's air quality index.
To put that in perspective, the hig... 阅读全帖 |
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b********n
发帖数: 38600 | 15 China joins US as top influencer in science
https://asia.nikkei.com/Tech-Science/Science/China-joins-US-as-top-
influencer-in-science?utm_source=SupChina&utm_campaign=87c932b6a0-20170613-
312+AnbangConfirmsChairmanInTrouble&utm_medium=email&utm_term=0_caef3ab334-
87c932b6a0-163366685
It's paying off in other ways, too. * According to the Japan Science and
Technology Agency, China now ranks as the most influential country in four
of eight core scientific fields, tying with the U.S. The agency too... 阅读全帖 |
|
发帖数: 1 | 16 https://www.nature.com/articles/d41586-018-07833-9
Plans to build a particle smasher in Japan to succeed the Large Hadron
Collider have suffered a significant setback. An influential report by
Japanese scientists concluded that they could not support plans to build the
International Linear Collider (ILC) in the country. The facility has been
decades in design and would study the Higgs boson, which was discovered in
2012 and is the last puzzle piece in particle physicists’ ‘standard model
’.
The ... 阅读全帖 |
|
发帖数: 1 | 17 你牛。我Google了才知道
Apparently, the highest possible known temperature is 142 nonillion kelvins
(That is 142 followed by 30 zeroes). This is the highest temperature that
scientists know of according to the standard model of particle physics,
which is the physics that underlies and governs our universe. Beyond this,
physics starts to breakdown. This is known as Planck Temperature. Ultimately
, this can only come about when particles achieve what is known as thermal
equilibrium. In order for it to be t... 阅读全帖 |
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C*I
发帖数: 4736 | 18 一直在误导，现在还在误导。 说说明corona virus 不可以从蝙蝠直接传染给人，必须
经过一个中间宿体性的其它动物才能传染给人。所以，病毒发生后，就故意误导全国人
民去海鲜市场找证据，找其它野生动物的麻烦。 而且还是病毒所去找的，找完了还装
模做样化验呀，分离呀什么的。最后把责任全部推给了海鲜市场的动物。可是那种动物
，一直不敢说，说了其它相关已经在人就会去早那种动物监测。 所以压根不说，打马
虎眼。
事实上，早在2013 年，就是这个武汉病毒研究所，已经从来自云南的蝙蝠身上所携带
的corona virus中分离出第一株蝙蝠SARS类似样的冠状病毒的活病毒，其中就包含了类
似于S类型的基因。从而证实这株病毒能够使其接受和SARS病毒相同的受体，并能够感
染人的细胞。对此新发现，武汉病毒所还把它以武汉病毒研究所的英文简称命名“WIV1
”，以彰显这一发现的重要价值和属于自己第一个发现的巨大研究成果。这个成果刊载
于2013年11月的《自然》杂志。
就是说，从云南弄回来的这种蝙蝠所携带的类似于sars的 corona virus， 可以不经过
其它受体/宿体，而直接传染给人。 他们... 阅读全帖 |
|
C*I
发帖数: 4736 | 19 一直在误导，现在还在误导。 说说明corona virus 不可以从蝙蝠直接传染给人，必须
经过一个中间宿体性的其它动物才能传染给人。所以，病毒发生后，就故意误导全国人
民去海鲜市场找证据，找其它野生动物的麻烦。 而且还是病毒所去找的，找完了还装
模做样化验呀，分离呀什么的。最后把责任全部推给了海鲜市场的动物。可是那种动物
，一直不敢说，说了其它相关已经在人就会去早那种动物监测。 所以压根不说，打马
虎眼。
事实上，早在2013 年，就是这个武汉病毒研究所，已经从来自云南的蝙蝠身上所携带
的corona virus中分离出第一株蝙蝠SARS类似样的冠状病毒的活病毒，其中就包含了类
似于S类型的基因。从而证实这株病毒能够使其接受和SARS病毒相同的受体，并能够感
染人的细胞。对此新发现，武汉病毒所还把它以武汉病毒研究所的英文简称命名“WIV1
”，以彰显这一发现的重要价值和属于自己第一个发现的巨大研究成果。这个成果刊载
于2013年11月的《自然》杂志。
就是说，从云南弄回来的这种蝙蝠所携带的类似于sars的 corona virus， 可以不经过
其它受体/宿体，而直接传染给人。 他们... 阅读全帖 |
|
C*I
发帖数: 4736 | 20 Published: 30 October 2013
Isolation and characterization of a bat SARS-like coronavirus that uses the
ACE2 receptor
Xing-Yi Ge, Jia-Lu Li, Xing-Lou Yang, Aleksei A. Chmura, Guangjian Zhu,
Jonathan H. Epstein, Jonna K. Mazet, Ben Hu, Wei Zhang, Cheng Peng, Yu-Ji
Zhang, Chu-Ming Luo, Bing Tan, Ning Wang, Yan Zhu, Gary Crameri, Shu-Yi
Zhang, Lin-Fa Wang, Peter Daszak & Zheng-Li Shi
Nature volume 503, pages535–538(2013)Cite this article
Abstract
The 2002–3 pandemic caused by severe acute respirator... 阅读全帖 |
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y****i
发帖数: 2108 | 21 不是。
N95 Respirators. An N95 respirator is a respiratory protective device
designed to achieve a very close facial fit and very efficient filtration of
airborne particles. The 'N95' designation means that when subjected to
careful testing, the respirator blocks at least 95 percent of very small (0.
3 micron) test particles. |
|
y****i
发帖数: 2108 | 22 尼玛的还真是不见棺材不落泪。
戴好你的老花镜查查字典看清楚了。
https://www.fda.gov/medical-devices/personal-protective-equipment-infection-
control/masks-and-n95-respirators
N95 Respirators
An N95 respirator is a respiratory protective device designed to achieve a
very close facial fit and very efficient filtration of airborne particles.
The ‘N95’ designation means that when subjected to careful testing, the
respirator blocks at least 95 percent of very small (0.3 micron) test
particles. If properly fitted, the filtration cap... 阅读全帖 |
|
发帖数: 1 | 23 While a surgical mask may be effective in blocking splashes and large-
particle droplets, a face mask, by design, does not filter or block very
small particles in the air that may be transmitted by coughs, sneezes, or
certain medical procedures. Surgical masks also do not provide complete
protection from germs and other contaminants because of the loose fit
between the surface of the face mask and your face.
你所谓的文献，你给我找出证据来 |
|
发帖数: 1 | 24 原来看的找不到了。
不过随手一篇 68%
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4293989/
Aside from handwashing, the use of facemasks is also valuable in infectious
disease control, especially in circumventing droplet transmission.(14,15)
For example, the effectiveness of surgical masks and N95 masks in blocking
the transmission of SARS are 68% and 91%, respectively.(7)
Facemasks, when fitted properly, effectively disrupt the forward momentum of
particles expelled from a cough or sneeze, preventing disease tra... 阅读全帖 |
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c**i
发帖数: 6973 | 25 【 以下文字转载自 Salon 讨论区 】
发信人: choi (choi), 信区: Salon
标 题: 中国呼吁禁止部署太空武器能有效吗？
发信站: BBS 未名空间站 (Thu Aug 13 14:50:01 2009, 美东)
VOA Chinese, Aug. 13, 2009.
http://www.voanews.com/chinese/2009-08-13-voa64.cfm
Note:
(a) The report states, "第二类是粒子束武器。就是发射强大的粒子束." See
Particle beam weapon
http://en.wikipedia.org/wiki/Particle_beam_weapon
("An electron particle beam weapon works by disrupting electric circuits and
electronic devices in its targets. If any living animals or persons were to
be caught by the el |
|
T*******d
发帖数: 98 | 26 喇嘛们走了，去向不明。
下面的英文是从学校的broadcast email摘录的，他们来自印度，周游美国，每到一地
，花一周时间作一副沙画。
我们和校方交涉过后的几天，他们再没有摆置那份偏激反中国的传单，连其他的传单也
基本没有摆置，不知道是因为没有传单了，还是学校建议他们连其他的几份夹杂反中言
论的传单也不要放置。
总的来说，只要我们讲道理，还是有作用的。
The monks, from the Drepung Gomang Monastic University of Tibetan Buddhism
in South India, are touring the U.S. Their stop here will include
construction of a sand mandala, a sacred art form using colorful sand
particles, with each particle representing an aspect of wisdom or guiding
principle.
The opening ceremony Su |
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c**i
发帖数: 6973 | 27 (1) I was assuming that Chinese in the county realized that the radioactive
source was Cobalt-60, emitted beta particles and confined inside a building.
Therefore, radioactive dusts were not an issue.
(2) Then, radiation from the cobalt-60 could not travel far.
FAQs About Radiation Protection
http://www.nrc.gov/about-nrc/radiation/related-info/faq.html
("Alpha and beta particles do not travel far at all, and they are easily
blocked.")
(3) I cannot find argument for or against your statement that |
|
c**i
发帖数: 6973 | 28 VOA Chinese, Aug. 13, 2009.
http://www.voanews.com/chinese/2009-08-13-voa64.cfm
Note:
(a) The report states, "第二类是粒子束武器。就是发射强大的粒子束." See
Particle beam weapon
http://en.wikipedia.org/wiki/Particle_beam_weapon
("An electron particle beam weapon works by disrupting electric circuits and
electronic devices in its targets. If any living animals or persons were to
be caught by the electric discharge of an electron beam weapon, they would
most likely be electrocuted. An electron beam weapon can also da |
|
l******a
发帖数: 3803 | 29 Mother shot 13-month-old boy in stroller for insurance money, say defense
attorneys for teen charged in murder
Jury selection in the trial of De'Marquise Elkins, 18, begins Monday, but
his lawyers say Sherry West had 'financial interest in the death of her son,
' Antonio Santiago.
Comments (196)
BY NINA GOLGOWSKI / NEW YORK DAILY NEWS
SUNDAY, AUGUST 18, 2013, 12:04 PM
_gen/derivatives/landscape_635/baby-stroller-slain.jpg
_gen/derivatives/landscape_635/baby23n-1-web.jpg
_gen/derivatives/landscap... 阅读全帖 |
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s*******a
发帖数: 8827 | 30 i see. mobil 1 官方对此倒是有一番说法，不过作为消费者，市场上有这么多油可选
，保险起见，还是用别的油较好。
以下是mobil 1对高含铁量的说法
Q. Many of you asked questions similar to this one from “buster:”
“For unknown reasons, Mobil 1 tends to show higher Fe in various oil
analysis reports compared to other branded oils in similar driving
conditions. I've been on this website long enough to know that it's a real
characteristic of the oil. We understand that this may be nothing ‘
significant’ at all, and that the scientific process is far from good
cons... 阅读全帖 |
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j*****n
发帖数: 1781 | 31 ☆─────────────────────────────────────☆
supervita (又见你挥舞红旗望先人的足迹) 于 (Wed Nov 17 18:40:17 2010, 美东) 提到:
今天去walmart实地考察了一下，（只考虑walmart能买到的，别的太贵了，而且也不方
便），有以下几种全合成的（以下价格都是5qt大包装）
* mobil 1 (银美孚）$24.5
* mobil 1 extended performance （金美孚） $28
* pennzoil $28
* castrol $24.5? (记不太清了）
* Valvoline synpower $21
大家觉得那种对新车engine的protection最好呢？
☆─────────────────────────────────────☆
ffo (果子狸) 于 (Wed Nov 17 18:41:44 2010, 美东) 提到:
0w 40有卖吗？
☆─────────────────────────────────────☆
xkm1948 (xkm19... 阅读全帖 |
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g****u
发帖数: 1 | 32 Care and Maintenance Tips Keep Your Car Running in Top-Notch Condition
We’ve compiled our best expert advice, surprising tricks, and car care tips
to prolong the life of your automobile!
1. Be patient during the break-in period
You’ve bought your dream car and now you want to make it last at long as
possible in top condition. Here are some things to remember as you pull it
out of the dealer’s lot:
During the break-in period, typically the first 1,000 miles (1,600 km), keep
your speed under 55 mp... 阅读全帖 |
|
t**********3
发帖数: 12623 | 33 CO2排出量绝对汽油大于柴油。
柴油尾气的问题是可吸入的particles，但是尾气净化系统通过喷雾化emission
treatment fluid来控制particles |
|
W***n
发帖数: 11530 | 34 The Real Cost of Your Car’s Cheap Factory Air Filter
by Timothy Zahl on December 03, 2015
Air Filters Selection
In today's world, saving money wherever possible has become essential. But
it's important not to lose sight of the fact that, sometimes, a product that
costs more up front will save you more money over time. In our business, we
've seen far too many consumers judge products solely on the basis of their
initial cost, completely neglecting any long-term economy and benefits. When
it come... 阅读全帖 |
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b****r
发帖数: 10 | 35 现在拿到了Purdue和 U Toronto的offer，剩下的学校估计没戏了。关于选校问题想听
下师兄师姐的建议。我是高能物理方向，对以后没什么很明晰的打算，应该很大的可能
继续做物
理。但听说要做物理faculty很难，高能要做几期Post，还是有所忌惮的。
首先，我很想了解下这两所学校粒子物理方面的实力，不知师兄师姐听别人讲过没。从
网站上
看，似乎Purdue有几个70多岁的大牛，但似乎有些青黄不接的感觉，听师兄说有做CMS
做的不错
的。关于Toronto 的高能实力我不太了解，也是我很想知道的，但我感觉不能期待加拿
大那种国
家在高能物理方面有多好。如果师兄对Toronto在高能方面有所耳闻的话，还请师兄帮
助。我也想
知道U Toronto其他物理方面的实力，比如在什么方向比较强。
其次，从学校名气上看，似乎Toronto更出名些，而且地理位置好，如果以后不做物理
，应该在加
拿大找工作要比Purdue毕业后好找些，不知道我的这种感觉是不是对。另外，各种大学
排名中似
乎U Toronto似乎都比较好，不知道真有那样好。。。。不知道加拿大那边的研究会不
会比较水，
感觉加... 阅读全帖 |
|
q******g
发帖数: 390 | 36 Abergel, Rebecca J., Lawrence Berkeley National Laboratory, Berkeley, CA, “
Harnessing f㎡rbital Bonding through Precision Antenna Ligand Design for
Actinide Complexation,” selected by the Office of Basic Energy Sciences.
Braley, Jenifer C., Colorado School of Mines, Golden, CO, “Actinide N〥onor
Thermodynamics: Expanding the f〦lement Covalency Dialogue,” selected by
the Office of Basic Energy Sciences.
Cerfon, Antoine J., New York University, New York, NY, “High Performance
Equilibrium Solvers fo... 阅读全帖 |
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c**i
发帖数: 6973 | 37 Sarah Nassauer, Why Wood Pulp Makes Ice Cream Creamier. Wall Street Journal,
May 4, 2011.
http://online.wsj.com/article/SB1000142405
2748703834804576300991196803916.html
Note:
(a) colloid
http://en.wikipedia.org/wiki/Colloid
(A hydrocolloid is defined as a colloid system wherein the colloid particles
are dispersed in water)
Chemically, a typical hydrocolloid is emulsion, where an individual particle
with an oil core is separated nd stabilized--so that the oil droplets will
not rise to the top--b... 阅读全帖 |
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c*********s
发帖数: 385 | 38 不是发霉。记得小时候父母说是面粉里面麦麸之类的析出来造成的。
刚才好奇google了一下，在一个pizza论坛发现了较为合理的解释。
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问题：
Tom: Having a problem with black dots forming on top of our dough balls.
They show themselves as early as 12 hours after production and are plainly
visible within 2 days. What do you think? Any suggestions to stop this? We
use active dry yeast.
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答：
There are a number of things that can result in those black spots, reduced
iron particles (iron in the enrichment blend in the flour "enriched flour"),
or the... 阅读全帖 |
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w***s
发帖数: 7132 | 39 面包机买了挺久了，第一次拿出来用。还是蛮方便的，把黄油糖面粉水一股脑儿扔
进去就不用管它了，在它提示的时候放点葡萄干。
土人才知道，原来yeast还分Active Dry Yeast 和 Rapid Rise Yeast,
搜了下区别：
What is the difference between fast-rising yeast (RapidRise/Bread Machine
Yeast) and Active Dry Yeast?
RapidRise and Bread Machine Yeast are different strains than Active Dry
Yeast. RapidRise and Bread Machine Yeast are grown with a higher level of
nutrients and are dried to lower moisture content. The particle size of
RapidRise and Bread Machine Yeast are finely granulated to a... 阅读全帖 |
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a******s
发帖数: 4052 | 40 http://web.archive.org/web/20010117182700/http://www.celestion.
CELESTION 1
The new Celestion 1 is a masterpiece of loudspeaker engineering designed
to enhance any of today's music systems, whether as an upgrade to a Midi
system, or for use in a more audiophile set-up. This high quality speaker
utilises Celestion's renowned 1" (25mm) titanium dome tweeter along with a
special new 4" (105mm) felted fibre cone mid/bass unit to provide superb
sound reproduction. Coupled with the compact slee... 阅读全帖 |
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p****2
发帖数: 518 | 41 因为硅谷这边很少有直接招物理的，recruiter和猎头也罕有接触物理，
请大家评价以下几个专业描述 哪个更合您的胃口？
1. theoretical particle physics
2. theoretical high energy physics
3. high energy theory
4. high energy physics
5. particle physics
6. theoretical physics
7. mathematical & theoretical physics |
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p**f
发帖数: 2610 | 42 这个做的挺好.
我没用过particle board,有几个问题.
(1) particle board切面是不是veneer?
(2) 板之间连接,你是用router开槽然后粘上的吗?还是用hardware固定?
(3) 照片上看不太清楚,架子固定在墙上时,下面还有支撑吗?还是就是靠screw? |
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p**f
发帖数: 2610 | 43 还有,你的书架背面也是particle board吗?
我一般都用clear pine做这类的东西. particle board,我一个人都搬不动. |
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j***b
发帖数: 5901 | 44 Before I hear more idiotic comments about my "feeling discomfort from
inhaling fiber glass", let's just read this.
http://www.livestrong.com/article/124778-fiberglass-breathing-danger-effects/
Respiratory Distress
Inhaling the material could cause irritation of the mouth, nasal passage and
throat. The Illinois Department of Health's fact sheet reports the
fiberglass strands or dust can be easily inhaled. Mucous membranes in air
passages are particularly sensitive to foreign particles. The inhale... 阅读全帖 |
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c*****g
发帖数: 228 | 45 刚买了个老房子，以前的橱柜15年了，是Oak的，台面是tile的，definitely要换台面，
现在的问题是，到底要不要换橱柜呢？要换就必须现在换，要不然granite装上就换不
了了。
刚开始觉得橱柜的condition不错，小农地想用gel stain和glazer刷刷。我试着刷了
一下，效果还很不错。对比图如下：
[img
src="http://farm6.static.flickr.com/5021/5651687361_6c1f958f49_z.jpg"]
结果今天才发现，老橱柜的box是particle board，也就是刨花板，又开始怀疑值不值
得搞这么一
趟，particle的box能再用个10年么？要不要干脆咬牙再花5000换新柜子？
对了，厨房的layout挺满意的，不需要变动，唯一美中不足就是没有corner cabinet，
最末的那个
cabinet里面基本上就是死角，还有两个6'的窄窄柜子，很不好用。当然，新式的
cabinet都是
frameless，式样也更为现代，还有deep drawer啊什么的，不过这些都ok，I can live
with
i... 阅读全帖 |
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w********a
发帖数: 65 | 46 Sacha Cohen的设计，有好些都非常实用，总算将这个做挡水板(backsplash)的方法试
了一下，感觉可以变得更creative，就是要花些时间。发在博客中，也在这里借人气
share 一下。有空的朋友可以试试看。
愿意看录像的可以直接看，不愿意的可以看下面的文字。（很抱歉，录得时候是英文的
，有空或需要的话再录中文的。还有文字中不知如何粘贴录像中的图片，抱歉。。。）
Fancy and artistic backsplash can be very expensive. If you are tight on
budget, try this one. All you need is paint; no tiles involved.
The first thing you need is a particle board.
Cut the board to size and sand the sharp edges and corners. (有图片)
What I did was an about 3-foot high and 10-foot long piece. ... 阅读全帖 |
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w******t
发帖数: 16937 | 47 Radon is a chemical element with symbol Rn and atomic number 86. It is a
radioactive, colorless, odorless, tastelessnoble gas, occurring naturally as
the decay product of uranium or thorium. Its most stable isotope, 222Rn,
has a half-life of 3.8 days. Radon is one of the densest substances that
remains a gas under normal conditions. It is also the only gas under normal
conditions that only has radioactive isotopes, and is considered a health
hazard due to its radioactivity. Intense radioactivity... 阅读全帖 |
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h*******y
发帖数: 360 | 48 这样的帖子出现很多次了，个别回复过，但还是单独发个帖吧，希望更多人了解。
噪音就不提了，每个人忍受力不同。这里主要考虑来自高速公路的颗粒状物质（
Particulate Matter, or PM）及一氧化碳。 PM，尤其是fine PM 和ultra fine PM,
吸入人体后，会给身体健康，尤其是心脏和呼吸系统带来损害。小孩和老人更是容易受
影响。具体危害这里有官方介绍：
http://www.epa.gov/pm/health.html
那么离高速多远才安全呢。简单地说：300米以外。 条件实在不允许的话，100米以外
。因为研究表明距离100米， PM 浓度大幅下降，而300米时，PM浓度已经和背景浓度基
本相当了。另外，了解一下所靠近的公路是否有大量卡车经过（可以实地考察或到DOT
取得数据），卡车多的高速PM是汽车多的高速的3倍，最好远离。
Reference：
Zhu, Y., Hinds, W. C., Kim, S., Shen, S., and Sioutas, C.: Study of
ultrafine particles near a major h... 阅读全帖 |
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s******d
发帖数: 9806 | 49 说实话，估计掂量不出来。一般来讲实木重不过particle board吧。但是实木有的很重
的，particle board也有比较轻的。很难讲。不过您老说的，确实是一个很大的
concern. |
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y***j
发帖数: 11235 | 50 最近我也在研究一个乞丐架子。打算框子3/4MDF,里面1/2，然后刷漆。但是外面卖的书
架我量了几个都是5/8
particle board和MDF都行，如果不追求强度，强度和耐水性上MDF稍好。
如果喜欢贴白皮或者木纹就particle board，像涂彩色漆就MDF。 |
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