Month: April 2019

I just bought a Power Bank and stumbled upon products on Wish-e – 900000 mAh. Do these guys even realize how much a 900 amp-hour battery should weigh? About 60-80 kilograms including the box to fit it all in. Here, for example, is a two-volt 1000 Ah battery for sale: https://www.thesolarbiz.com/crown-batteries-2v-1000-ah-battery.html?fee=1&fep=199&gclid=Cj0KCQjw5J_mBRDVARIsAGqGLZA4I31w_uL5NKSHqCBpTLeUjg1lZPzg9RdxzfXGtVKhSOcGH98C7nIaAjAiEALw_wcB

Don’t fall for the scam. A fairly stable indicator of battery quality is its weight. “Off-brand” manufacturers try to reduce weight for higher capacity numbers. This is needed for marketing purposes, and it also lowers the cost of production, regardless of what’s inside. Normal manufacturers understand that the laws of physics can’t be circumvented, and they need to either reduce the capacity number or not fuss with the weight and offer a heavier battery. The greater the capacity, the more currents, and roughly speaking the wiring and electricity heavier it needs to be.

A 10000 mAh should weigh at least 210 grams. Accordingly, a 20000 mAh should weigh at least 420 grams.

There’s also the concept of Energy Density – https://www.epectec.com/batteries/chemistry/ which is energy per unit volume. This means that a 20000 mAh should be exactly twice as large as a 10000 mAh. It should consist of twice as many cells inside (looking like AA batteries).

Decided to read what they are writing in France about Notre-Dame after some time, opened what seemed to be the independent Le Parisien and was stunned: out of fourteen headlines on the main page, all fourteen contain “Macron”. And you talk about Channel One)

At the very least, in the middle there are cool presentations about Tesla’s image recognition system

Great interview @[711408:2048:Semyon Dukach] @[1512104653:2048:Elizaveta Osetinskaya]. A smart guy, interesting interview. Respect to both.

From my own experience, I see that impressions of other nationalities through life in the USA are shaped by people of those nationalities who have found the strength and opportunity to leave everything at home and come to the USA, and achieve something here. Not everyone is capable of this. Therefore, a hypothetical Korean in the USA differs from a hypothetical Korean living in Korea, and the attitude towards Koreans by “Americans in nth generation” is formed by observing those who “made it.” This creates a somewhat distorted impression of the nationality, as it is shifted, but still shifted towards the better. Hence, Russians here are not drunkards, but workaholics. And Koreans and Chinese – every other one is a mathematician, musician, and artist.

https://www.youtube.com/watch?v=cwy2OGQ6sng

When The Yogurt Took Over

@Liza’s school

Liza told me that Americans are always amazed by her way of doing long division. It’s just that they, following the same principle, work everything leftwards and upwards – https://www.mathsisfun.com/long_division.html

For your Monday mood. Playing Melancholy Snowfall by Michele Mclaughlin. I’m late for the snowfall, but the flood of colors is at its peak here. In the middle of the video, there’s a little clip with cherry blossom.

“…After such a concert, as an honest man, he is simply obliged to get married!”

(thanks to exler.ru for the link to something wonderful)

https://www.youtube.com/watch?v=Sk2yoOY8CTU

Beethoven 5th

Studying ABAP, a programming language for SAP ERP. Wrote my first program that exports something from the materials table.

For amusement:

1. ABAP – whitespace-sensitive, and also with quite a perverse syntax. That is, x=a+b(c) does not mean what you think, but (writing in Java) a.substring(b,c), yet if you add spaces x = a + b( c ), it turns into a method call b with parameter c.

2. Printing an integer by default is formatted, meaning WRITE A will print 0000000056. To remove the zeros, after the variable name, you should write a format specifier NO-ZERO after a space.

(Post to be updated)