我有意見的是....
nelson2000 wrote:
2010-12-14 中國時報 尹德瀚／綜合報導
這是貶低 中國時報的價值吧！
這應該沒啥好報導吧！
不然應該列在趣味版吧！
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台灣不缺席 ::
大家一起罵 ::
<small>檢視較大的地圖</small>
開車到 Chesterfield Royal Hospital 的路線指示
01246 277 271
1.
1.
29 分鐘
A61
13.6 英里
謝菲爾德, 雪菲爾
英國
1. 朝西，走High St/A621，往Flat St前進
繼續沿著A621前進
經過2個圓環
1.3 英里
2. 於Alderson Rd口向左轉
0.1 英里
3. 於Queens Rd/A61口向右轉
0.2 英里
4. 於London Rd/A61口向左轉
繼續沿著A61前進
經過4個圓環
10.6 英里
5. 在A632出口下交流道，朝Chesterfield/Matlock/Bolsover前進
0.2 英里
6. 於Hollis Ln/A632口向右轉
繼續沿著A632前進
1.0 英里
7. 微靠左行
0.2 英里
8. 向右轉
121 英呎
Chesterfield Royal Hospital
Chesterfield, Derbyshire S44 5
United Kingdom
December 11th, 2010
BMJ Christmas 2010: Bicycle Weight and Commuting Time
Dr. Jeremy Groves
Dr. Jeremy Groves
Each year, the British Medical Journal publishes a 2-week Christmas Edition over the holidays:
We publish a special two-week issue of the BMJ over Christmas and New Year. We are pleased to consider all kinds of articles, including reports of original research, for this issue and particularly welcome colour illustrations.
The articles accepted for publication in the special holiday issue are typically tongue-in-cheek, and it’s been described as their “left brain issue”. Here are a few articles from past years:
* Rugby (the religion of Wales) and its influence on the Catholic church: should Pope Benedict XVI be worried?
* Frankincense: systematic review
* Billy Bunter and the obesogenic environment
* Coca-Cola douches and contraception
* Head and neck injury risks in heavy metal: head bangers stuck between rock and a hard bass
* Not becoming a communist doctor
* Back to the future: emergency departments and ancient Greek warfare
* Bumf: increasing exponentially
* The cult of the conference bag
* How to safeguard your ring in theatre
* Texting shows recovery after faint
With the above in mind, I was excited to see Dr. Jeremy Groves’ “study” on lightweight bicycles and their affect on commute times in this year’s edition. To approach his paper with the proper levity, consider this comment from the introduction: “I toyed with the idea of blinding it but, in the interest of self preservation and other road users, decided against it.”
Here’s the abstract:
Objective – To determine whether the author’s 20.9 lb (9.5 kg) carbon frame bicycle reduced commuting time compared with his 29.75 lb (13.5 kg) steel frame bicycle.
Design – Randomised trial.
Setting – Sheffield and Chesterfield, United Kingdom, between mid-January 2010 and mid-July 2010.
Participants – One consultant in anaesthesia and intensive care.
Main outcome measure – Total time to complete the 27 mile (43.5 kilometre) journey from Sheffield to Chesterfield Royal Hospital and back.
Results – The total distance travelled on the steel frame bicycle during the study period was 809 miles (1302 km) and on the carbon frame bicycle was 711 miles (1144 km). The difference in the mean journey time between the steel and carbon bicycles was 00:00:32 (hr:min:sec; 95% CI –00:03:34 to 00:02:30; P=0.72).
Conclusions – A lighter bicycle did not lead to a detectable difference in commuting time. Cyclists may find it more cost effective to reduce their own weight rather than to purchase a lighter bicycle.
This entertaining paper was clearly all for fun, though there’s certainly much more than a modicum of truth in the conclusion.
http://www.cyclechat.net/topic/73982-dr-jeremy-groves-is-an-idiot/
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高科技單車 ::
要有高科技維護團隊 ::
Dr.Dr Jeremy Groves
用 防刺胎 鋼管車 與 管胎的碳纖車 的自行車
在每天騎乘超過 100 分鐘的 上下班路途
破胎比率可想而知 ::
平均是無意義的 ::
比賽不用看平均值 ::
新單車 勝利 90次
舊單車 勝利 10次
新單車 90 分鐘 * 100次 + 10次 18分鐘補胎 平均 :: 108 分
舊單車 98 分鐘 * 100次 + 5次 18分鐘補胎 平均 :: 107 分
新單車在六個月期間花費的平均時間是一小時四十八分，
比舊單車的平均時間一小時四十七分還慢。
A keen cyclist since childhood, the author Dr Jeremy Groves, owns two bikes. One a second hand 13.5 kg steel framed bike bought for £50 and the other a brand new 9.5 kg carbon framed bike that cost £1000.
When Dr Groves, a consultant in anaesthesia and intensive care at Chesterfield Royal Hospital, realised his new bike took 43 minutes to get him to work rather than the 44 minutes it took on his old bike he questioned whether the difference in cost was worth it.
Dr Groves believed the only way to be certain which bike was faster was to set up a randomised trial.
For six months (January 2010 to July 2010) the author undertook the same journey on both bikes, tossing a £1 coin to decide which bike to use before setting off from home. The trip included a dual carriageway, country lanes, farm track and an up hill trek of 400 metres.
Identical lights were used on each bike as well as appropriate clothing for the weather conditions on the day of the journey.
The average journey on the steel framed bike was one hour and 47 minutes (a round trip of 27 miles to work and back) and the average time for the new carbon framed bike was one hour and 48 minutes.
While a 30% reduction in cycle weight may seem large, concludes the author, the results show that there is no measurable difference in commuting time between his light and heavy bikes. He adds that "a reduction in the weight of the cyclist rather than that of the bicycle may deliver greater benefit at reduced cost."
Dr Groves comments: "I bought an expensive bike for a couple of reasons. The main one was because I thought I would have a faster daily commute. The second was that, as I wasn't spending the money on a car, the new bike was essentially paying for itself. This study has shown that spending a lot of money on a bicycle for commuting is not necessarily going to get you to work more quickly. This is good news as I appreciate that £1000 for a bicycle is out of the range of many peoples pockets. Cycling for me is a great hobby. It gets me out in the fresh air, keeps me healthy, is carbon neutral and, provided I don't buy any more bikes(!), is a cost effective way to travel."
Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.
在醫院擔任麻醉顧問的葛羅夫擁有兩輛腳踏車，一輛是碳纖維車架，售價一千英鎊（約台幣四萬八千元），另一輛是他以五十英鎊（約台幣二千四百元）買來的二手腳踏車，葛羅夫每天輪流騎其中一部去上班並記錄時間。根據他的記錄，新單車在六個月期間花費的平均時間是一小時四十八分，比舊單車的平均時間一小時四十七分還慢。
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