星期五, 九月 14, 2007

802.11b WiFi Channels to Frequency

802.11b WiFi Channels

In the United States and Canada there
are 11 channels available for use in the 802.11b 2.4GHz WiFi Frequency
range. This standard is defined by the IEEE.





































































ChannelLower FrequencyCenter FrequencyUpper Frequency




1

2.401

2.4122.423
22.4042.4172.428
32.4112.4222.433
42.4162.4272.438
52.4212.4322.443
62.4262.4372.448
72.4312.4422.453
82.4362.4472.458
92.4412.4522.463
102.4512.4572.468
112.4512.4622.473

There are only 3 non-overlapping channels available in the
802.11b standard.These are Channels 1,6, and 11. For WiFi access
points that are located near each other it is recommended that they
each use one of the above non-overlapping channels to minimize the
effects of interference.


This overlapping of 2.4GHz channels are better visualized from the chart below.


802.11 Frequency channel map


802.11b WiFi Frequency Channels

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星期三, 九月 12, 2007

奔驰撞人来回碾压3次逃匿 被撞女子幸运逃生(图)


奔驰撞人来回碾压3次逃匿 被撞女子幸运逃生(图)


2007-09-11 09:10:28 来源: 奥一网(深圳) 网友评论 0 进入广东论坛





  •   核心提示:昨日凌晨,在深圳罗湖区嘉宾东路的十字路口,一奔驰车从反向车道欲倒车插入正常车道时,将一名女子撞倒。幸运的是倒地女子恰好倒在底盘下,奔驰连续倒车三次均未轧中,随后该车逃逸。






奥一网9月11日讯 昨日凌晨4时20分左右,在罗湖区嘉宾东路的十字路口,奔驰车从反向车道欲倒车插入正常车道时,将一名女子撞倒。幸运的是倒地女子恰好倒在底盘下,奔驰连续倒车三次均未轧中,随后该车逃逸。


昨日凌晨4时50分左右,记者赶到现场时,很多围观者已经散去。女子的一双高跟凉鞋被碾得烂
成几块,凌乱地散落在马路上。据目击者介绍,当时奔驰车主从反向车道冲至十字路口,由于是红灯,奔驰车欲倒车插入正常行车道,结果将正在过马路的一名女子
撞倒在地。随后,奔驰车又连倒三次车,幸运的是,女子倒在其车子底盘下,未造成其生命危险。在撞到一辆红色的士后,奔驰车主驾车逃逸。


多名目击者记下了奔驰车的车牌:京A612××。附近一烧烤档主介绍说,奔驰车上有两名男子,司机40多岁的样子,肇事前曾在嘉宾路的建行取款机取款。


记者在流花医院见到被撞女子,她裤子上沾满了泥巴,胳膊、脚面、背部、腰部多处被严重擦伤,右锁骨骨折。该女子称,事发时,她倒在车子下面,什么都看不清楚,只知道车子倒了几次,随后就吓晕了。(作者:马小六)(奥一网) 江泽文


奔驰撞人来回碾压3次逃匿 被撞女子幸运逃生(图)_网易新闻中心

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星期二, 九月 11, 2007

Learning about Phakic Intraocular Lenses

Learning about Phakic Intraocular Lenses




Phakic intraocular lenses are new devices used to correct nearsightedness.
These thin lenses are implanted permanently into the eye to help reduce
the need for glasses or contact lenses.


This web site is meant to help you learn more about phakic lenses. It
only provides general information and is not meant to replace a discussion
with your doctor, since every patient is unique and every doctor practices
medicine slightly differently.


See other sections of this site to learn more about:




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What are Phakic Lenses?

What are Phakic Lenses?


Phakic intraocular lenses, or phakic lenses, are lenses made
of plastic or silicone that are implanted into the eye permanently to
reduce a person's need for glasses or contact lenses. Phakic refers
to the fact that the lens is implanted into the eye without removing
the eye's natural lens. During phakic lens implantation surgery, a small
incision is made in the front of the eye. The phakic lens is inserted
through the incision and placed just in front of or just behind the
iris.




View movie of the anatomy of the eye

(Requires Flash Player - Download)





For more details on phakic lens
implantation surgery, go to
Before,
During and After Surgery


What do they treat?


Phakic lenses are used to correct refractive errors, errors in the
eye's focusing power. Currently all phakic lenses approved by the FDA
are for the correction of nearsightedness (myopia).


The cornea and natural lens of the eye focus light to create an
image on the retina, much like the way the lens of a camera focuses
light to create an image on film. The bending and focusing of light is
also known as refraction. Imperfections in the focusing power of the
eye, called refractive errors, cause images on the retina to be out of
focus or blurred.


People that are nearsighted have more difficulty seeing distant objects
than near objects. For these people, the images of distant objects come
to focus in front of the retina instead of on the retina.




View movie of how phakic lenses work

(Requires Flash Player - Download)



Ideally, phakic lenses cause light
entering the eye to be focused on the retina providing clear distance
vision without the aid of glasses or contact lenses.


Surgery is not required to correct nearsightedness. You can wear glasses
or contact lenses instead to correct your vision. Depending on how nearsighted
you are, and other conditions of your eye, other refractive surgery
(surgery to correct refractive errors) options may be available to you,
including PRK (Photorefractive Keratectomy) and
LASIK
(Laser Assisted In-Situ Keratomileusis).


Can they be removed?


Phakic lenses are intended to be permanent. While the lenses can be
surgically removed, return to your previous level of vision or
condition of your eye cannot be guaranteed.


What is the difference between phakic intraocular lenses and intraocular
lenses following cataract surgery?


Phakic intraocular lenses are implanted in the eye without removing
the natural lens. This is in contrast to intraocular lenses that are
implanted into eyes after the eye's cloudy natural lens (cataract) has
been removed during cataract surgery.



US FDA What Are Phakic Lenses?

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Are Phakic Lenses For You?

Are Phakic Lenses For You?


You are probably NOT a good candidate for phakic lenses if:


  • You are not an adult. There are no phakic lenses
    approved by the FDA for persons under the age of 21.
  • You are not a risk taker. Certain complications
    are unavoidable in a percentage of patients, and there are no long-term
    data available for phakic lenses.
  • You required a change in your contact lens or glasses prescription
    in the last 6 to 12 months in order to obtain the best possible vision
    for you.
    This is called refractive instability. Patients
    who are:
    • in their early 20s or younger,
    • whose hormones are fluctuating due to disease such as diabetes,
    • who are pregnant or breastfeeding, or
    • who are taking medications that may cause fluctuations in vision,

    are more likely to have refractive instability and should discuss the
    possible additional risks with their doctor.


  • You may jeopardize your career. Some jobs prohibit
    certain refractive procedures. Be sure to check with your employer/professional
    society/military service before undergoing any procedure.
  • Cost is an issue. Most medical insurance will not
    pay for refractive surgery.
  • You have a disease or are on medications that may affect
    wound healing.
    Certain conditions, such as autoimmune diseases
    (e.g., lupus, rheumatoid arthritis), immunodeficiency states (e.g.,
    HIV) and diabetes, and some medications (e.g., retinoic acid and steroids)
    may prevent proper healing after intraocular surgery.
  • You have a low endothelial cell count or abnormal endothelial
    cells.
    If the cells that pump the fluid out of your cornea,
    the endothelial cells, are low in number relative to your age, or
    if your endothelial cells are abnormal, you have a higher risk of
    developing a cloudy cornea and requiring a corneal transplant.
  • You actively participate in sports with a high risk of eye
    trauma.
    Your eye may be more susceptible to damage should
    you receive a blow to the face or eye, such as a blow to the head
    during boxing or hit in the eye by a ball during baseball. Your eye
    may be more susceptible to rupture or retinal detachment, and the
    phakic lens may dislocate.
  • You only have one eye with potentially good vision. If
    you only have one eye with good vision with glasses or contact lenses,
    due to disease, irreparable damage, or amblyopia (eye with poor vision
    since childhood that cannot be corrected with glasses or contact lenses),
    you and your doctor should consider the risk of possible damage and/or
    loss of vision to your better eye as a result phakic lens implantation.
  • You have large pupils. If your pupil dilates in
    low lighting conditions to a size that is larger than the size of
    the lens, you have a higher risk of experiencing visual disturbances
    after surgery that may affect your ability to function comfortably
    or normally under such conditions (e.g., while driving at night).
  • You have a shallow anterior chamber. If the space
    between the cornea and the iris, the anterior chamber, is narrow,
    you have a higher risk of developing complications, such as greater
    endothelial cell loss, due to implantation of the phakic lens.
  • You have an abnormal iris. If your pupil is irregularly
    shaped you have a higher risk of developing visual disturbances.
  • You have had uveitis. If you have had inflammation
    in your eye, you may have a recurrence or worsening of your disease
    and/or may develop additional complications, such as glaucoma, as
    a result of surgery.
  • You have had problems with the posterior part of your eye.
    If you have had any problems in the back part of your eye
    or are at risk for such problems, for example, proliferative diabetic
    retinopathy (growth of abnormal vessels in the back of the eye due
    to diabetes) or retinal detachment, you may not be a good candidate
    for phakic lens implantation. The phakic lens may not allow your eye
    doctor to get a clear view of the back part of your eye, preventing
    or delaying detection of a new or worsening problem, and/or the phakic
    lens may prevent or make treatment of a problem in the back of your
    eye more difficult.

The safety and effectiveness of phakic lenses have NOT been studied
in patients with certain conditions. If any of the following apply to
you, make sure you discuss them with your doctor:


  • You have glaucoma (damage to the nerve of the eye
    resulting in loss of peripheral and then central vision due to too
    high pressure inside the eye), ocular hypertension
    (high eye pressure), or glaucoma suspect (some indications,
    but not clear, that patient has glaucoma). You may have a higher risk
    of developing or worsening of glaucoma as a result of phakic lens
    implantation.
  • You have pseudoexfoliation syndrome (abnormal deposits
    of material in the eye visible on the structures in the front part
    of the eye, such as on the front of the natural lens and the back
    of the cornea). This syndrome is associated with glaucoma and weakness
    of the structures holding the natural lens in place (the zonules).
    You may have a higher risk of surgical complications and/or complications
    after surgery if you have this syndrome.
  • You have had an eye injury or previous eye surgery.
  • Your need for visual correction is outside the range for
    which the phakic lens has been approved.
    Ask your eye doctor
    if the phakic lens that he or she recommends for you has been approved
    to treat your refractive error and/or check FDA-Approved
    Phakic Lenses
    for the approved refractive range.
  • You are over the age of 45 years old. Some phakic
    lenses have not been studied in patients over the age of 45.

US FDA Are Phakic Lenses for You?

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星期一, 九月 10, 2007

WIFI RF Frequency Band


Frequency Band :
.
2412 MHz -2462 MHz (North America/FCC) (11 channels)

.
2412 MHz -2472 MHz (ETSI/Europe) (13 channels)

.
2412 MHz -2484 MHz (Japan) (14 channels)

.
2457 MHz -2472 MHz (France)


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星期五, 九月 07, 2007

高超的记者采访

1.郝海东刚抵达昆明,迎候在网易机场的记者向他发问:“请问你对本地的三陪小姐有什么看法?”   
  郝海东知道北京、上海都明文禁止三陪小姐的,所以反问:“这里居然还有三陪小姐吗?”于是,第二天网易头条新闻的标题就是:千里迢迢,海东今日飞抵本地。心急火燎,脱口便问三陪小姐!   
2.第二天又有网易记者采访郝海东:“请问你对本地的三陪小姐有什么看法?”这次郝海东学乖了,回答说:“对不起,我对本地的三陪小姐不感兴趣。”   
  转天的网易还是有的说:见多识广,海东夜间娱乐要求高。不屑一顾,本地三陪小姐遭冷遇!   
3.第三天网易记者居然还是就此发问:“请问你对本地的三陪小姐有什么看法?”郝海东回答得非常干脆:“我对三陪根本不感兴趣!”  
  本以为这下可以天下太平了,没想到网易的标题更不像话:欲海无边,海东三陪已难满足。得寸进尺,四陪五陪才能过瘾!   
4.到第四天的时候,各媒体间郝海东与三陪的题材比比皆是,成为热点。记者们都纷纷发问,郝海东干脆紧闭牙关,一言不发。   
  郝海东无话,网易仍然有话:面对三陪问题,海东无言以对!   
5.第五天还是有网易记者在问同样关于三陪的问题,郝海东终于急了:“你们要是再问三陪的问题,我就去告你们!”   
  于是,网易上的标题顺理成章地写道:海东一怒为三陪!

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