April 30, 2015

Правила жизни Павла Дурова

Журнал Esquire

Павел Дуров
Предприниматель, 30 лет

В 2006 году выпускник филологического факультета СПбГУ Павел Дуров создал социальную сеть «ВКонтакте». В декабре 2013 года Дуров отказался предоставить ФСБ данные администраторов группы «Евромайдан» и продал свою долю в компании. В следующем году он уехал из России.
Правила жизни

Я миролюбив, я вегетарианец, и я не люблю войны.

Я продал свою долю «ВКонтакте», так как ее наличие могло помешать мне принимать правильные решения. Но я ни о чем не жалею — защита личных данных людей стоит этого и намного большего. С декабря 2013 года у меня нет собственности, но у меня осталось нечто более важное — чистая совесть и идеалы, которые я готов защищать.

Компромисс хуже любой из альтернатив.

Фотограф Алексей Кузьмичев

Я был в гостях у очень богатых людей, был на больших яхтах, частных самолетах, виллах — и я четко понял, что все это мне не нужно.

Всеобщая любовь — тревожный знак для человека, привыкшего плыть против течения.

Помните те случаи, когда ваше мнение шло полностью вразрез с мнением окружающих? Это самые ценные моменты, в которые нужно вцепляться мертвой хваткой. Мир вокруг нас развивается так быстро, что общепринятые убеждения на наших глазах становятся издевательством над здравым смыслом.

Идее достаточно 10% убежденных сторонников, чтобы сконвертировать остальные 90% общества на свою сторону. Убежденных в чем-то людей может быть меньше 10% — 5%, 2%, даже тысячная процента населения. Но если их вера в успех и преданность идее непоколебимы, им невозможно противостоять. В экстремальном случае для изменений любого масштаба достаточно веры одного человека. Вашей, например.

Неверие в возможность менять мир страшнее лени, пьянства или наркомании. Потому что именно оно является их причиной.

Небольшое напоминание адептам позитивного мышления. Из словосочетания «будь здоровым» автоматически следует, что можно им не быть. Призыв «верь в себя» подразумевает, что в данный момент читатель этого не делает.

Всегда, в каждую минуту своей жизни, даже когда вы абсолютно счастливы, имейте одну установку в отношении окружающих вас людей: я в любом случае сделаю то, чего хочу, с вами или без вас.

Коммуникация переоценена. Час одиночества продуктивнее недели разговоров.

Способность к многочасовой концентрации на одном занятии — навык, который в нашу мобильно-онлайновую эпоху встречается все реже. Но именно этот навык необходим для интеллектуального, творческого или духовного прорыва. Будущее за теми, кто выработает иммунитет к технологическим ловушкам внимания и сохранит способность к длительной концентрации.

Характерная черта нашей цивилизации — любовь к лекарствам, которые опаснее самой болезни.

Никто не вправе запретить депутатам нашего парламента делать громкие заявления.

Самый опасный яд — информационный.

Бюрократическая структура, которая призвана с чем-то бороться, едва ли станет устранять корень проблемы. Более вероятно, что она будет незаметно стимулировать то, что должна уничтожить. Только так она сможет расширять свое влияние и финансирование.

Где нет конкуренции — нет прогресса.

Упрощайте.

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April 29, 2015

Definitions of the SI units: Non-SI units

Units outside the SI

Certain units are not part of the International System of Units, that is, they are outside the SI, but are important and widely used. Consistent with the recommendations of the International Committee for Weights and Measures (CIPM, Comité International des Poids et Mesures), the units in this category that are accepted for use with the SI are given in Table 6.


Table 6.  Units outside the SI that are accepted for use with the SI
NameSymbol Value in SI units
minute (time)min1 min = 60 s
hourh1 h = 60 min = 3600 s
dayd1 d = 24 h = 86 400 s
degree (angle)°1° = ( pi/180) rad
minute (angle)'1' = (1/60)° = (pi/10 800) rad
second (angle)''1'' = (1/60)' = (pi/648 000) rad
literL1 L = 1 dm3 = 10-3 m3
metric ton (a)t1 t = 103 kg
neperNp1 Np = 1
bel (b)B1 B = (1/2) ln 10 Np (c)
electronvolt (d)eV1 eV = 1.602 18 x 10-19 J, approximately
unified atomic mass unit (e)u1 u = 1.660 54 x 10-27 kg, approximately
astronomical unit (f)ua1 ua = 1.495 98 x 1011 m, approximately
(a) In many countries, this unit is called "tonne.''
(b) The bel is most commonly used with the SI prefix deci: 1 dB = 0.1 B.
(c) Although the neper is coherent with SI units and is accepted by the CIPM, it has not been adopted by the General Conference on Weights and Measures (CGPM, Conférence Générale des Poids et Mesures) and is thus not an SI unit.
(d) The electronvolt is the kinetic energy acquired by an electron passing through a potential difference of 1 V in vacuum. The value must be obtained by experiment, and is therefore not known exactly.
(e) The unified atomic mass unit is equal to 1/12 of the mass of an unbound atom of the nuclide 12C, at rest and in its ground state. The value must be obtained by experiment, and is therefore not known exactly.
(f)
The astronomical unit is a unit of length. Its value is such that, when used to describe the motion of bodies in the solar system, the heliocentric gravitation constant is (0.017 202 098 95)2 ua3·d-2. The value must be obtained by experiment, and is therefore not known exactly.

    

The liter in Table 6 deserves comment. This unit and its symbol l were adopted by the CIPM in 1879. The alternative symbol for the liter, L, was adopted by the CGPM in 1979 in order to avoid the risk of confusion between the letter l and the number 1. Thus, although both l and L are internationally accepted symbols for the liter, to avoid this risk the preferred symbol for use in the United States is L. Neither a lowercase script letter l nor an uppercase script letter L are approved symbols for the liter.

Other units outside the SI that are currently accepted for use with the SI by NIST are given in Table 7. These units, which are subject to future review, should be defined in relation to the SI in every document in which they are used; their continued use is not encouraged. The CIPM currently accepts the use of all of the units given in Table 7 with the SI except for the curie, roentgen, rad, and rem. Because of the continued wide use of these units in the United States, NIST still accepts their use with the SI.


Table 7.  Other units outside the SI that are currently accepted for use with the SI, subject to further review
NameSymbolValue in SI units
nautical mile1 nautical mile = 1852 m
knot1 nautical mile per hour = (1852/3600) m/s
area1 a = 1 dam2 = 102 m2
hectareha1 ha = 1 hm2 = 104 m2
barbar1 bar = 0.1 MPa = 100 kPa = 1000 hPa = 105 Pa
ångströmÅ1 Å = 0.1 nm = 10-10 m
barnb1 b = 100 fm2 = 10-28 m2
curieCi1 Ci = 3.7 x 1010 Bq
roentgenR1 R = 2.58 x 10-4 C/kg
radrad1 rad = 1 cGy = 10-2 Gy
remrem1 rem = 1 cSv = 10-2 Sv

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SI Unit rules and style conventions

Check List for Reviewing Manuscripts

   #1
General 
Only units of the SI and those units recognized for use with the SI are used to express the values of quantities. Equivalent values in other units are given in parentheses following values in acceptable units only when deemed necessary for the intended audience.
   #2
Abbreviations
Abbreviations such as sec, cc, or mps are avoided and only standard unit symbols, prefix symbols, unit names, and prefix names are used.
 proper:s or second; cm3 or cubic centimeter; m/s or meter per second
          improper:sec; cc; mps
   #3
Plurals
Unit symbols are unaltered in the plural.
proper:
l = 75 cm
improper:
l = 75 cms
   #4
Punctuation
Unit symbols are not followed by a period unless at the end of a sentence.
proper:
The length of the bar is 75 cm.
The bar is 75 cm long.
improper:
The bar is 75 cm. long.
    #5
Multiplication
& division
A space or half-high dot is used to signify the multiplication of units. A solidus (i.e., slash), horizontal line, or negative exponent is used to signify the division of units. The solidus must not be repeated on the same line unless parentheses are used.
 proper:
The speed of sound is about 344 m·s-1  (meters per second)
The decay rate of 113Cs is about 21 ms-1  (reciprocal milliseconds)
m/s,  m·s-2,  m·kg/(s3·A),  m·kg·s-3·A-1

m/s,  m s-2,  m kg/(s3 A),  m kg s-3 A-1
 improper:
The speed of sound is about 344 ms-1  (reciprocal milliseconds)
The decay rate of 113Cs is about 21 m·s-1  (meters per second)
m ÷ s,  m/s/s,  m·kg/s3/A
   #6
Typeface
Variables and quantity symbols are in italic type. Unit symbols are in roman type. Numbers should generally be written in roman type. These rules apply irrespective of the typeface used in the surrounding text.  For more details, see Typefaces for symbols in scientific manuscripts
proper:
She exclaimed, "That dog weighs 10 kg!"
t = 3 s, where t is time and s is second
T = 22 K, where T is thermodynamic temperature, and K is kelvin
improper:
He exclaimed, "That dog weighs 10 kg!
t = 3 s, where t is time and s is second
T = 22 K, where T is thermodynamic temperature, and K is kelvin
   #7
Typeface
Superscripts and subscripts are in italic type if they represent variables, quantities, or running numbers. They are in roman type if they are descriptive.
subscript categorytypefaceproper usage 
quantityitaliccp, specific heat capacity at constant pressure
descriptiveromanmp, mass of a proton
running numberitalic
   #8
Abbreviations
The combinations of letters "ppm," "ppb," and "ppt," and the terms part per million, part per billion, and part per trillion, and the like, are not used to express the values of quantities.
 proper:2.0 µL/L; 2.0 x 10-6 V;
4.3 nm/m; 4.3 x 10-9 l;
7 ps/s; 7 x 10-12 t,
where V, l, and t are the quantity symbols for volume, length, and time.
improper:"ppm," "ppb," and "ppt," and the terms part per million, part per billion, and part per trillion, and the like
   #9
Unit
modifications
Unit symbols (or names) are not modified by the addition of subscripts or other information. The following forms, for example, are used instead.
proper:Vmax = 1000 V
a mass fraction of 10 %
improper:V= 1000 Vmax
10 % (m/m) or 10 % (by weight)
   #10
Percent
The symbol % is used to represent simply the number 0.01.
proper:l1 = l2(1 + 0.2 %), or
D = 0.2 %,
where D is defined by the relation D = (l1 - l2)/l2.
improper:the length l1 exceeds the length l2 by 0.2 %
   #11
Information
& units
Information is not mixed with unit symbols or names.
proper:the water content is 20 mL/kg
improper:20 mL H2O/ kg
20 mL of water/ kg
   #12
Math
notation

It is clear to which unit symbol a numerical value belongs and which mathematical operation applies to the value of a quantity.
proper:35 cm x 48 cm
1 MHz to 10 MHz or (1 to 10) MHz
20 °C to 30 °C or (20 to 30) °C
123 g ± 2 g or (123 ± 2) g
70 % ± 5 % or (70 ± 5) %
240
x (1 ± 10 %) V
improper:
35 x 48 cm
1 MHz-10 MHz or 1 to 10 MHz
20 °C-30 °C or 20 to 30 °C
123 ± 2 g
70 ± 5 %
240 V ± 10 % (one cannot add 240 V and 10 %)
   #13
Unit
symbols
& names

Unit symbols and unit names are not mixed and mathematical operations are not applied to unit names.
 proper:kg/m3, kg · m-3, or kilogram per cubic meter
 improper:kilogram/m3, kg/cubic meter, kilogram/cubic meter, kg per m3, or kilogram per meter3.
   #14
Numerals &
unit
symbols
Values of quantities are expressed in acceptable units using Arabic numerals and symbols for units.
proper:m = 5 kg
the current was 15 A
improper:m = five kilograms
m = five kg
the current was 15 amperes
   #15
Unit
spacing
There is a space between the numerical value and unit symbol, even when the value is used in an adjectival sense, except in the case of superscript units for plane angle.
proper:a 25 kg sphere
an angle of 2° 3'  4"
If the spelled-out name of a unit is used, the normal rules of English apply: "a roll of 35-millimeter film."
improper:a 25-kg sphere
an angle of 2 ° 3 ' 4 "
   #16
Digit
spacing
The digits of numerical values having more than four digits on either side of the decimal marker are separated into groups of three using a thin, fixed space counting from both the left and right of the decimal marker. Commas are not used to separate digits into groups of three.
proper:
15 739.012 53
improper:
15739.01253
15,739.012 53
   #17
Quantity
equations
Equations between quantities are used in preference to equations between numerical values, and symbols representing numerical values are different from symbols representing the corresponding quantities. When a numerical-value equation is used, it is properly written and the corresponding quantity equation is given where possible.
 proper:(l/m) = 3.6-1 [v/(km/h)](t/s)
 improper:l = 3.6-1 vt, accompanied by text saying,
"where l is in meters, v is in kilometers per hour, and t is in seconds"
   #18
Standard
symbols
Standardized quantity symbols are used. Similarly, standardized mathematical signs and symbols are used. More specifically, the base of "log" in equations is specified when required by writing loga x (meaning log to the base aof x), lb x (meaning log2 x), ln x (meaning loge x), or lg x (meaning log10 x).
proper:tan x
R for resistance
A
r for relative atomic mass
improper:tg x for tangent of x
words, acronyms, or ad hoc groups of letters
   #19
Weight vs.
mass
When the word "weight" is used, the intended meaning is clear. (In science and technology, weight is a force, for which the SI unit is the newton; in commerce and everyday use, weight is usually a synonym for mass, for which the SI unit is the kilogram.)
   #20
Quotient
quantity
A quotient quantity is written explicitly.
proper:mass divided by volume
improper:mass per unit volume
   #21
Object &
quantity
An object and any quantity describing the object are distinguished. (Note the difference between "surface" and "area," "body" and "mass," "resistor" and "resistance," "coil" and "inductance.")
proper:A body of mass 5 g
improper:A mass of 5 g
   #22
Obsolete
Terms
The obsolete terms normality, molarity, and molal and their symbols N, M, and m are not used.
proper:amount-of-substance concentration of B (more commonly called concentration of B), and its symbol cB and SI unit mol/m3 (or a related acceptable unit)
molality of solute B, and its symbol bB or mB and SI unit mol/kg (or a related unit of the SI)
improper:normality and the symbol N, molarity and the symbol M
molal and the symbol m

©