Is the boarding process/time the same for any train in China, or does the bullet train have its special boarding process?

chinadiscovery.com (mirror) specifies the boarding process for high-speed trains in China as follows:

enter image description here

Is that boarding process/time the same for any train in China, or does the bullet train have its special boarding process?

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server – do 20.04 bridges work? what’s amis with mine? do i need a special kernel?

Trying to setup a bridge for libvirt using 20.04 netplan. Network is fine before trying to define a bridge, but doesn’t come up with my bridge definition. What am i missing?

Do i need a special kernel? See why i pose this question right near the bottom.

Before trying to define a bridge the network works fine with this:

  #  cat /etc/netplan/00-installer-config.yaml
# This is the network config written by 'subiquity'
network:
  ethernets:
    eno1:
      addresses:
      - 10.3.8.12/21
      gateway4: 10.3.8.3
      nameservers:
        addresses:
        - 10.3.8.3
  version: 2

Trying to setup a bridge i change the contents to:

network:
  ethernets:
    eno1:
      dhcp4: false
      dhcp6: false
  bridges:
    br96:
      interfaces: ( eno1 )
      addresses: (10.3.8.12/21)
      gateway4: 10.3.8.3
      nameservers:
        addresses: (10.3.8.3)
  version: 2

Below i show ‘ip a’ before and after applying the netplan, networkctl status, et al. Can anyone clue me what’s amis?

  $  ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 40:a8:f0:67:12:46 brd ff:ff:ff:ff:ff:ff
    inet 10.3.8.12/21 brd 10.3.15.255 scope global eno1
       valid_lft forever preferred_lft forever
    inet6 fe80::42a8:f0ff:fe67:1246/64 scope link
       valid_lft forever preferred_lft forever

  #  netplan --debug generate
DEBUG:command generate: running ('/lib/netplan/generate')
** (generate:1386): DEBUG: 09:50:10.524: Processing input file /etc/netplan/00-installer-config.yaml..
** (generate:1386): DEBUG: 09:50:10.524: starting new processing pass
** (generate:1386): DEBUG: 09:50:10.524: We have some netdefs, pass them through a final round of validation
** (generate:1386): DEBUG: 09:50:10.524: eno1: setting default backend to 1
** (generate:1386): DEBUG: 09:50:10.524: Configuration is valid
** (generate:1386): DEBUG: 09:50:10.524: br96: setting default backend to 1
** (generate:1386): DEBUG: 09:50:10.524: Configuration is valid
** (generate:1386): DEBUG: 09:50:10.524: Generating output files..
** (generate:1386): DEBUG: 09:50:10.524: openvswitch: definition eno1 is not for us (backend 1)
** (generate:1386): DEBUG: 09:50:10.524: NetworkManager: definition eno1 is not for us (backend 1)
** (generate:1386): DEBUG: 09:50:10.524: openvswitch: definition br96 is not for us (backend 1)
** (generate:1386): DEBUG: 09:50:10.524: NetworkManager: definition br96 is not for us (backend 1)
(generate:1386): GLib-DEBUG: 09:50:10.524: posix_spawn avoided (fd close requested)
(generate:1386): GLib-DEBUG: 09:50:10.525: posix_spawn avoided (fd close requested)
  0# netplan apply
(ssh connection drops)
  # reboot
(comes up with no network)

  $  ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 40:a8:f0:67:12:46 brd ff:ff:ff:ff:ff:ff

  #  head -99 /r*/s*/n*k/*
==> /run/systemd/network/10-netplan-br96.netdev <==
(NetDev)
Name=br96
Kind=bridge

==> /run/systemd/network/10-netplan-br96.network <==
(Match)
Name=br96

(Network)
LinkLocalAddressing=ipv6
Address=10.3.8.12/21
Gateway=10.3.8.3
DNS=10.3.8.3
ConfigureWithoutCarrier=yes

==> /run/systemd/network/10-netplan-eno1.network <==
(Match)
Name=eno1

(Network)
LinkLocalAddressing=no
Bridge=br96

  #  networkctl
IDX LINK TYPE OPERATIONAL SETUP
  1 lo loopback carrier unmanaged
  2 eno1 ether no-carrier pending

2 links listed.

  0#  networkctl status -a
Failed to query link bit rates: Unit dbus-org.freedesktop.network1.service not found.
Failed to query link bit rates: Unit dbus-org.freedesktop.network1.service not found.
● 1: lo
             Link File: /usr/lib/systemd/network/99-default.link
          Network File: n/a
                  Type: loopback
                 State: carrier (unmanaged)
                   MTU: 65536
  Queue Length (Tx/Rx): 1/1
               Address: 127.0.0.1
                        ::1

● 2: eno1
             Link File: /usr/lib/systemd/network/99-default.link
          Network File: n/a
                  Type: ether
                 State: no-carrier (pending)
                  Path: pci-0000:00:19.0
                Driver: e1000e
                Vendor: Intel Corporation
                 Model: Ethernet Connection I217-LM
            HW Address: 40:a8:f0:67:12:46 (Hewlett Packard)
                   MTU: 1500 (min: 68, max: 9000)
  Queue Length (Tx/Rx): 1/1
      Auto negotiation: yes
                 Speed: 1Gbps
                Duplex: full
                  Port: tp

Jan 15 11:07:30 filbert systemd-networkd(752): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(752): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(756): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(756): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(758): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(758): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(760): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(760): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(763): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(763): eno1: Failed

  0#  journalctl -xe|grep networkd
(redacted, askubuntu says it "looks like spam")

  0#  dpkg -l *netplan*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=================-======================-============-===========================================================
ii libnetplan0:amd64 0.100-0ubuntu4~20.04.3 amd64 YAML network configuration abstraction runtime library
un netplan <none> <none> (no description available)
ii netplan.io 0.100-0ubuntu4~20.04.3 amd64 YAML network configuration abstraction for various backends
lines 1-8/8 (END)

  0#  apt-get install netplan
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package netplan is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'netplan' has no installation candidate
  100#  cat /etc/apt/sources.list
(edited to redact "links")
deb ... focal main restricted
deb ... focal-updates main restricted
deb ... focal universe
deb ... focal-updates universe
deb ... focal multiverse
deb ... focal-updates multiverse
deb ... focal-backports main restricted universe multiverse
deb ... focal-security main restricted
deb ... focal-security universe
deb ... focal-security multiverse
  0#  ls -ld /etc/apt/sources.list*/*
ls: cannot access '/etc/apt/sources.list*/*': No such file or directory
  2#

So i tried ‘apt-get install ifupdown’ and tried this in /etc/network/interfaces:

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet static
      address 10.3.8.12
      netmask 255.255.248.0
      gateway 10.3.8.3
      dns-nameserver 10.3.8.3

That works, so next i tried with a bridge:

auto lo
iface lo inet loopback

auto br0
iface br0 inet static
   bridge_ports eno1
      address 10.3.8.12
      netmask 255.255.248.0
      gateway 10.3.8.3

And that doesn’t work. So i tried:

  #  ifup br0
add bridge failed: Package not installed
run-parts: /etc/network/if-pre-up.d/bridge exited with return code 1
ifup: failed to bring up br0

That means “You don’t have kernel support for bridging…Compile it in. It should be in ‘Networking’ → ‘Networking options’.” according to http://helpful.knobs-dials.com/index.php/Networking_notes_-_the_lower_three_levels#Add_bridge_failed:_Package_not_installed

So do i need a special kernel?

special functions – Plotting Radiation Pattern for Hermite-Gaussian beams for different modes

I want to plot the Radiation Pattern for Hermite-Gaussian beams (HG beam) as given in the Figures Ref Research Paper Fig 2, where u and v be the beam modes for the Hermite-Gaussian beams

Hermite-Gaussian beams radiation pattern

The coding is attached here

F1(u_, v_, x_, y_,z_)=(1/w0)*(1/Sqrt(Pi*2^(u + v + 1)*u!*v!))*(w(z))^-1*Exp(-(x^2 + y^2)*w^2(z)^-1)*HermiteH(v, Sqrt(2) y *w(z)^-1)* HermiteH(u, Sqrt(2) x*w(z)^-1)*Exp(I(k*z + (k (x^2 + y^2))/2*(R(z))^-1 - (u + v + 1) (Phi))) 
w0 = 1*10^-6;
zR = 1/2 k*(w0)^2;
k = (2 (Pi))/(Lambda);
(Lambda) = 0.55*10^-6;
w(z_) = w0 Sqrt(1 + (z/zR)^2);
R(z_) = z + (zR)^2/z;
(Phi) = ArcTan(z/zR);

Here I the values for w0 and k, but the plot is not drawn. Moreover, when I draw the intensity distribution for the Hermite-Gaussian beam then its plots becomes clear as

F1(m_, n_, x_, y_) =Sqrt(1/(2^(m + n - 1)*Pi*m!*n!))*HermiteH(m, Sqrt(2) x)*HermiteH(n, Sqrt(2) y)*Exp(-(x^2 + y^2));
t11 = DensityPlot((F1(0, 2, x, y)^2), {x, -3, 3}, {y, -3, 3}, PlotRange -> All, ColorFunction -> "SunsetColors",PlotLegends -> Automatic) 

Hermite Gaussian beam Intensity Distribution

Guide me where the mistake exist, How to plot the HG beam radiation pattern?

dnd 5e – Is “a special melee attack” an actual game term?

PHB page 195 mentions “special melee attack” when talking about Grapple and Shove:

you can make a special melee attack to shove a creature

you can use the Attack action to make a special melee attack, a grapple

It uses words “make a special melee attack” like it is a thing in 5e, however, nowhere in the game text it’s being said what a “special melee attack” actually is. It isn’t even mentioned anymore. I believe that “special attack” is not a game term — it’s a vestige from the previous editions, where “special attacks” was a thing, but I could be mistaken.

Are there any other examples of “special melee attack” (or just “special attack”) in any official source book for 5e?

I was searching through dndbeyond and the only thing I’ve found was Sword Of Answering. But it uses words “special attack” in the context of the magic item description:

while you hold the sword, you can use your reaction to make one melee attack

any damage dealt with this special attack ignores any damage immunity or resistance the target has

You can remove the word “special” from its description and nothing changes. So it is plain English meaning here, not the game term.

So what is a “special attack” in terms of the game mechanics?

SQL server inserts a special string (space on the right) and exceeds the field size. Why not report an error?

DBversion:SQL Server 2016

--Create database
CREATE TABLE (dbo).(test) ((a) nvarchar(3))

--Insert strings longer than 3 (Success and not report an error)
SET ANSI_PADDING ON;
INSERT INTO test VALUES('1            ');

--Query table results '1  ',Its length is 3.

SET ANSI_PADDING ON;
INSERT INTO test VALUES('1111111111');
--(Err) 22001 - (SQL Server)String or binary data would be truncated.

according to docs.microsoft.com, said “Trailing blanks in character values inserted into varchar columns are not trimmed.”
Who can tell me why? Thanks a lot!

mysql connection from bash shell with special characters in password errors out

#!/bin/bash
set -x
MYSQLTEMPPWD=`grep 'temporary password' /var/log/mysqld.log | awk 'NF{ print 
$NF }'`;
MYSQLPWD=`echo "'$MYSQLTEMPPWD'"`;
echo $MYSQLPWD;
CONNINFO="mysql --host=localhost --user=root --password=$MYSQLPWD"
$CONNINFO <<EOF
ALTER USER 'root'@'localhost' IDENTIFIED BY 'Welcome!23';
show databases;
status;
EOF
set +x
exit
>  ./test.sh
++ grep 'temporary password' /var/log/mysqld.log
++ awk 'NF{ print $NF }'
+ MYSQLTEMPPWD='>fjkIyu#K7T?'
++ echo ''''>fjkIyu#K7T?''''
+ MYSQLPWD=''''>fjkIyu#K7T?''''
+ echo ''''>fjkIyu#K7T?''''
'>fjkIyu#K7T?'
+ CONNINFO='mysql --host=localhost --user=root --password='''>fjkIyu#K7T?''''
+ mysql --host=localhost --user=root '--password='''>fjkIyu#K7T?''''
mysql: (Warning) Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
+ set +x

Problem i face is for some reasons during the execution step single quote is getting added before password parameter
(‘–password=”’>fjkIyu#K7T?””).

Tried almost all possible ways based on the blogs, nothing helped sofar.

Anyone please suggest. Thanks…

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ra.rings and algebras – Is it possible that in certain rings the power series representing special functions are expressable via series representing elementary functions?

Let’s consider the Taylor power series of a function on real numbers.

Some of them represent elementary functions, and some of them represent special functions. The special functions cannot be expressed via finite combination of elementary functions on real or complex numbers.

Now, take some different ring (commutative of anticommutative). Is t possible that the power series, representing special functions on real numbers, can be represented as finite combination of the series, representing elementary functions in that ring?

The exponentiation, multiplication and addition operations in the power series expansions should be taken from that ring which we examine, while the power series themselves should be identical to those on reals.

For instance, sine function cannot be expressed via exponentiation on real numbers but can be on complex numbers due to algebraic properties of the imaginary unit. But this function is defined elementary anyway. What about such functions as digamma, gamma, zeta? Can their power series be expressed via the powerseries, corresponding to elementary functions in some rings?

special functions – Clebsch Gordan Coefficients: General Expression Does Not Match Specific Expression

The expression ClebschGordan({2, 0}, {4, 0}, {2, 0}) yields the correct result of Sqrt(2/7).

However the expression ClebschGordan({2, 0}, {l2, 0}, {2, 0})/. l2 -> 4 yields Indeterminate. Indeed, ClebschGordan({2, 0}, {l2, 0}, {2, 0}) evaluates to an algebraic expression numerator/((-4 + l2) (2 - l2)!) where numerator/.l2 -> 4 evaluates to Sqrt(2/7). This is indeed indeterminate.

Interestingly, the expression ClebschGordan({l2, 0}, {2, 0}, {2, 0}) /. l2 -> 4 gives the correct result, and ClebschGordan({l2, 0}, {2, 0}, {2, 0}) leads to a different algebraic expression that has the same values for 0<=l2<4 and the correct value for l2->4.

This would appear to be a minor bug, as it violates the simplest symmetry of the Clebsch Gordan coefficients.