Posts

  • 2017-05-24 02:31:00 +0100 | Source | Signature

    自願無償捐血

    blood-donation.jpg
    (Signature)

    之前有人捐活肝，有某NGO 捐十萬俾佢，俾人鬧到媽媽聲 (e.g. see the comments in https://www.facebook.com/tang.earthquake/posts/1344050939003853) 而家有人破壞香港恆之以久嘅無償捐血制，危害血液安全，某網媒竟然大肆宣揚，話係「員工福利」，出埋公司全名幫人賣廣告，「高層嘅回應相當幽默！」將一件相當危險嘅事加以美化

    Ignorance can kill.

    World Health Organization (2010). Towards 100% voluntary blood donation: A global framework for action. Ch. 2 (excerpt). ISBN: 978 92 4 159969 6. Available: http://www.who.int/bloodsafety/publications/9789241599696_eng.pdf

    A voluntary non-remunerated blood donor gives blood, plasma or cellular components of his or her own free will and receives no payment, either in the form of cash or in kind which could be considered a substitute for money. This would include time off work other than that reasonably needed for the donation and travel. Small tokens, refreshments and reimbursements of direct travel costs are compatible with voluntary, non-remunerated donation.
    […]
    Voluntary blood donors, particularly regular donors, are the first line of defence in preventing the transmission of HIV, hepatitis viruses and other bloodborne infections through the route of transfusion. A number of studies have reported significantly lower prevalence of transfusion-transmissible infection markers among voluntary donors compared with other types of donors, with the lowest rates among regular donors.
    […]
    People who accept payment for their blood are primarily motivated by the prospect of monetary gain rather than a desire to help save lives. The need to protect their income from blood “donation” compromises issues of honesty in the donor interview and they are highly unlikely to reveal reasons why they may be unsuitable to donate blood.

    (Emphasis mine)

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  • 2017-05-09 20:10:00 +0100 | Source | Signature

    On the legality of torrent trackers tracking copyrighted materials

    A: Hey have you seen my wallet? It has the words “Bad Motherfucker” on it.
    B: Yes the person over there with the gun told me he has it. The person next to him told me he wants it too.
    A: Thanks man.

    C: Hey have you seen my CD pirated as a torrent? It has the info-hash “a8fdc205a9f19cc1c7507a60c4f01b13d11d7fd0”.
    D: Yes the computer over there at IP address “101.202.3.4” told me it has it. The computer at “203.4.37.1” told me it wants the CD too.
    C: sends cease-and-desist letter to D

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  • 2017-03-20 10:22:00 +0000 | Source | Signature

    Recycling a tin can

    recycling-tin-can.jpg
    (Signature)

    We ignore that the claim has no source cited and assume it is true. I arbitrarily chose the Samsung UA32K4000ARLXL. Its maximum power usage is 72 W.[1] Accounting for older (and thus presumably less energy efficient) models we estimate the average power usage of a TV to be 100 W. Operating for 3 hours, this TV would consume 300 Wh of electricity. The total energy consumption per person in the UK is estimated to be 125 kWh per day.[2] This implies that recycling the tin can saves 0.24% of the energy we use daily. In alternative units, one needs to recycle more than 400 tin cans per day to be “energy neutral”. Cf. PET plastic water bottles, which we need to recycle 255 per day.[3] The two values having the same order of magnitude gives some credit to the original claim.

    [1]: http://www.samsung.com/in/tvs/hd-k4000/ [2]: Mackay, D., Sustainable Energy - without the hot air (2008). [3]: Shercliff, H.R., Part IA Paper 2: Structures and Materials - Materials Examples Paper 4 - Strength-limited Design, Process Selection, and Environmental Impact of Materials (2014). CUED.

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  • 2017-03-20 02:43:00 +0000 | Source | Signature

    A0 -> O1 -> A1 ??

    其實呢個encoding 究竟係邊個發明，點解可以咁on9

    點解A 個domain 係ℕ 但係O 個domain 係ℤ₊

    點解A0 之後唔係O0 而係O1

    A0 跳O0 嘅話一個ripple carry adder 就得

    每次state change 就加1，LSB 拆出黎分A/O，淨低做value

    init() { status = 0; }
onStateChange() { status++; }
decode() {
    state = status & 1;
    value = status >> 1;
}

    A0 跳O1 嘅話

    一係就要skip 一個status （init 做1 或者0 skip 去2）

    一係就改decode logic

    前者少咗一個representable value，後者用多咗logic gate

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  • 2016-12-26 16:27:00 +0000 | Source | Signature

    Nazi cosplay

    1gm92s.jpg
    (Signature)

    References

    [1]: “WWII Films”, R. P. Munroe (11 June 2014). https://what-if.xkcd.com/100/. Retrieved 27 December 2016.
    [2]: German Institute Taipei (24 December 2016). https://www.facebook.com/DeutschesInstTaipei/posts/985507984913406. Retrieved 27 December 2016.

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  • 2016-08-11 10:10:00 +0100 | Source | Signature

    鄺俊宇

    roy-kwong.jpg
    (Signature)

    一個33歲嘅人向一個18歲嘅人sell 年輕

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  • 2016-06-01 13:18:00 +0100 | Source | Signature

    爆炸梁柒到核爆

    machine-gun-leung.jpg
    (Signature)

    梁天琦選立法會嗰陣成日用「集氣」，呢位編輯咁都唔知，今次都唔知係邊個露底 [369]

    「就等我哋一齊集氣，將本土戰將⑥梁天琦送入立法會！」 ——本土民主前線，2016年2月18日

    「我哋呢一粒元氣彈差唔多集氣完成！聽日就係！銀！芽！一野轟落去嘅時間！我地就要打入議會！」 ——梁天琦，2016年2月28日凌晨1時正 （2019年按：已死link）

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  • 2016-02-23 12:12:00 +0000 | Source | Signature

    Pie chart

    pie-chart.jpg
    (Signature)

    畫pie chart 畫到20% 望落大過25% 係咩玩法

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  • 2015-10-27 00:29:00 +0000 | Source | Signature

    How large are the eyes of anime/manga characters?

    shana
    Figure 1: Shana overlaid on a set of Cartesian axes. (Signature)

    Take Shana in Figure 1 as an example. She is set to be \(141\,\mathrm{cm}\) tall.[1] On this set of axes her height is about 16 \(y\)-axis units.

    Line segment \(a\) which approximates the diameter of the eye (approximating the eye as a circle) has length \(\approx 0.5\) \(y\)-axis units. This gives an approximation of the diameter of the eye as \( \frac{141 \times 0.5}{16} = 4.4\,\mathrm{cm} \), corresponding to an area of about \(15\,\mathrm{cm}^2\).

    As a comparison, my left eye is \(3.5\,\mathrm{cm}\) long and \(1\,\mathrm{cm}\) wide. Approximating it as an ellipse, this corresponds to an area of less than \(3\,\mathrm{cm}^2\).

    References

    [1]: 高橋弥七郎, いとうのいぢ, アスキー・メディアワークス, and 劇場版「灼眼のシャナ」製作委員会, "劇場版　灼眼のシャナ," [Online]. Available: <https://web.archive.org/web/20110703103558/http://www.shakugan.com/movie/chara/index.html>. [Archived Jul. 03, 2011; Accessed Oct. 27, 2017].

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  • 2015-07-18 12:33:00 +0100 | Source | Signature

    TVB新聞透視

    TVB新聞透視話蠔嘅含鉛量係每公斤290毫克，係啟晴邨食水嘅十幾倍 大佬呀，你每日飲1L水係正常，但斷估你唔會每日食1kg蠔掛

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