Archive for electric bike

New York City trip

Posted in pictures, Running, Travel with tags , , , , , , , , , , on December 8, 2022 by xi'an

While the Sampling, Transport, Diffusion workshop at the Flatiron Institute kept me happily busy, and while I did not stay any longer, spending a few days in New York City was a treat and I took advantage of my early hours to go running along the river sides, first south of the Flatiron building, then north to the Queensboro Bridge and over it, and last north along the Hudson River. The East River side is much less convenient for running as the path is repeatedly blocked by construction / storage sites and Xing the Queensboro Bridge gave a great view of Manhattan, albeit at the risk of being hit by a bike / scooter / moppet, as the path was shared with [an endless flow of] speeding electric bicycles. As I had never been to this part of the city, I was unaware of the cable car / gondola to Roosevelt Island (surprisingly called tram), which I would have taken given an extra day. Came by uponchance over a Trump Tower, which I ignored was so inappropriately close to the UN Headquarters! Running on the uninterrupted Hudson River trail was much nicer (and busier) despite the freezing wind that day.

For once (!) I stayed in an hotel, reserved by the Flatiron, and for the three nights I was there it was most tolerable, except for the usual background noise found in hotels, both from heating fans and patrons discussing in the corridors after hours. But the staff was helpful to the point of purchasing a kettle for my early morning tea. As the workshop provided an enormous amount of food at all times (and there was a true matcha tea provider around the corner!), it did not matter in the least.

Vélib’surdity!

Posted in pictures, Running, Travel with tags , , , , , , , on April 8, 2018 by xi'an

On January 1, 2018, the official purveyor of short term rental bikes in Paris, the Vélib‘, changed, due to Smovengo winning the official bid for the renovation of the 2007 structure, against the contender JCDecaux. I almost never use these bikes as I travel with mine(s), except when stuck in a broken train or sudden industrial action! But I find amazing that the bid comparison did not consider the ecological cost of switching operators, as every single slot of every Vélib’ station had to be changed to accommodate the new bicycles. Some of which are electric bikes, requiring electricity plugs on every slot, two other ecological fallacies. And this is not even accounting for the disposal of tens of thousands of the older bikes (which were already suffering from a very high failure rate). Given the slow pace of the switch, free floating bike services like Ofo, Gobee, and OBike tried to take a share of the market, but they suffered so many degradations that they are gone or about to go. Another mountain of used bikes to dispose off…

cyclic riddle [not in NYC!]

Posted in Kids, R, Running, Travel with tags , , , , , , , , , , on December 29, 2017 by xi'an

In the riddle of this week on fivethirtyeight, the question is to find the average number of rounds when playing the following game: P=6 players sitting in a circle each have B=3 coins and with probability 3⁻¹ they give one coin to their right or left side neighbour, or dump the coin to the centre. The game ends when all coins are in the centre. Coding this experiment in R is rather easy

situz=rep(B,P)
r=1
while (max(situz)>0){
 unz=runif(P)
 newz=situz-(situz>0)
 for (i in (1:P)[unz<1/3]) 
  newz[i%%P+1]=newz[i%%P+1]+(situz[i]>0)
 for (i in (1:P)[unz>2/3])
  newz[i-1+P*(i==1)]=newz[i-1+P*(i==1)]+(situz[i]>0)
 situz=newz
 r=r+1}

resulting in an average of 15.58, but I cannot figure out (quickly enough) an analytic approach to the problem. (The fit above is to a Gamma(â-1,ĝ) distribution.)

In a completely unrelated aparté (aside), I read earlier this week that New York City had prohibited the use of electric bikes. I was unsure of what this meant (prohibited on sidewalks? expressways? metro carriages?) so rechecked and found that electric bikes are simply not allowed for use anywhere in New York City. Because of the potential for “reckless driving”. The target is apparently the high number of delivery e-bikes, but this ban sounds so absurd that I cannot understand it passed. Especially when De Blasio has committed the city to the Paris climate agreement after Trump moronically dumped it… Banning the cars would sound much more in tune with this commitment! (A further aparté is that I strongly dislike e-bikes, running on nuclear power plants,  especially when they pass me on sharp hills!, but they are clearly a lesser evil when compared with mopeds and cars.)