Fisika FluidDynamic Masjid

Walaupun beberapa masjid sudah mulai ber-AC, meski tampan aneh dengan tiadanya air-blocker di pintu masuk sehingga udara dingin jadi lolos keluar, sebagian besar masjid 'besar' masih menggunakan kipas angin sebagai fitur plus-nya.

Secara konstruksi bangunan tidak masalah, dengan lubang udara di bawah kubah yang dimaksudkan agar udara panas bisa keluar.

Namun secara praktek ada yang aneh, aliran udara kipas mengarah ke bawah! Akibatnya udara panas dari jemaah (tiap orang rata-rata setara dengan lampu 100watt) yang seharusnya naik dan keluar lewat lubang udara dipaksa kembali ke bawah oleh kipas, efeknya udara panas malah masuk dari atas dan ruang jadi tambah panas, efek lainnya adalah jemaah jadi masuk angin terkena hembusan kipas, setidaknya saya.

Seharusnya aliran udara kipas mengarah ke atas agar udara panas yang secara alami bergerak ke atas bisa keluar lewat lubang udara bawah kubah, udara relatif segar masuk dari pintu dan jendela, dan jemaah tidak masuk angin terkena hempasan udara kipas.

Soliloquy

hei

Namaku ...tapi biasa dipanggil Gepeng trus merambat jadi Peng kadang Cipeng juga Meng, nDul

Sekolah, kabur, lebih enak di jalan

Gitar, nyanyi, gak penting lagu apa

pake ecek-ecek, kadang gak perlu repot nyanyi

kalo 'rajin' bisa dapat lumayan

LSM yang ngurusi anak jalanan, ngajak kembali sekolah. 

Bagiku yang pernah sekolah, jalanan lebih menarik. 

Matematika? Aku tahu hutang yang harus kubayar di warung mbok Yem pas ngecer rokok pagi-pagi sebelum 'dinas' di perempatan.

Geografi? Sudah pernah kemana-mana numpang truk atau pick-up bak terbuka kalo pas ke stadion atau lihat konser underground atau sekedar pengin naik, terserah mau diturunkan di mana.

Kimia? Aku tahu campuran yang bagus untuk oplosan yang bikin cepat 'tinggi' ataupun oplosan yang pas buat rame-rame.

Mungkin mereka lebih cocok mengajak si Panjul tetanggaku yang gak pernah sekolah.

Hasil sejam bisa buat nge-game online di warnet pojok perempatan. penjaga warnet ok saja, malah senang dapet uang receh buat kembalian pelanggan.

tindik

mabuk gratis

nge-lem

rambut

sepatu

preman kemanusiaan, menodong sisi kemanusiaan

di bawah koordinasi

slot tempat mangkal. kalo untung bisa dijual lagi dengan harga tinggi. Cari tempat yang kira-kira nanti jadi ramai.

XFCE Display Manager with Opera on FreeBSD

Here is it, from the screenshot below you'll know that I'm trying download chrome but it apparently i got .exe chrome file installer for window albeit it's tell that I'll got linux (Debian, Ubuntu, Fedora, OpenSuSE)

FreeBSD on VBox with OS X Host

I use boot-only-iso 64 bit and the problem instantly arise because of my impatience.

Yup, I use 32 bit architecture on OS version setting (the first prompt in virtual box when we create new virtual machine). So change to 64-bit solved the problem, in some case, delete the vm and create whole new vm guarantee it.





Nothing special on the installation so, here is it:

Stuck on DFU or Recovery Mode or Connect to Itunes Logo Loop on iPhone

In the recent months, we've seen reports here and there of iPhones getting stuck in a restart loop. The black screen with the Apple logo shows up, holds for a while, and then disappears again; repeat ad infinitum. While it's not clear yet exactly what's triggering the issue (the complainants suspect that it may be a recent application update to blame), there is a tried and true way to get your iPhone, iPod touch, iPad or older iPod back to square one: either use recovery mode or do a DFU restore. 


DFU (Device Firmware Update) mode is a means to getting your iPhone to interface with iTunes without iTunes automatically loading the latest version of iOS onto it (it skips the iBoot bootloader, for jailbreak aficionados). Differing from recovery mode -- where iTunes restores your iPhone to its original factory settings but with the latest iOS and firmware -- DFU mode allows you to change and choose the firmware you want to install onto your iPhone. For instance, you would use DFU mode if you want to install a previous version of iOS, jailbreak your iPhone or unlock your SIM. If (for whatever reason) standard recovery isn't working for you to get your device back to working condition, DFU may help you out.



Remember, if you restore your phone in any fashion (via the iTunes 'Restore' button, recovery mode or DFU) you will lose any modifications made to unsynced content or in-app data since your last iTunes sync (game states, voice memos, notes etc.). Be cautious.

So, here's the basic info on how to enter DFU mode (and it works for your iPod touch, too). Instructions may vary slightly by year or model.

• Connect your iPhone to your computer via USB and launch iTunes.
• Now turn your iPhone off. Hold down the sleep / power button at the top right of your iPhone, then slide your finger across the "slide to power off" button on your iPhone's screen. (If it won't turn off, press Home and Sleep/Power until the screen goes dark, then release.)
• Once your iPhone is off, hold down both the sleep / power button as well as the home button for 10 seconds. Once 10 seconds has elapsed, release the sleep / power button on your iPhone, but continue to hold the home button until the the above message has appeared in iTunes telling you that your iPhone has been detected in recovery mode. (If you just want to go to recovery mode, skip the 10- second hold on both buttons and simply connect the phone while holding down Home, then wait for 'Connect to iTunes' screen on the phone.)

If you see the Apple logo or the "connect to iTunes" screen on your iPhone, you're not in DFU mode. DFU leaves the screen of the iPhone completely black.

To exit DFU mode, simply hold down the sleep / power button and the home button together until your iPhone disappears from the device list in iTunes, then turn on the iPhone as normal.

Again, for most purposes (save jailbreaking) there's no practical difference between DFU and a regular restore, except and unless you're in a situation where your phone won't go into restore mode normally.

Now, what if iPhone stuck on restore loop instead of restart loop? It often happen if we upgrade the iOS.  I've tried to exit it using "just" DFU mode with no result. Apparently it needs more step, ... and it is...

While in DFU mode

• while you plugged your iPhone and opening the itunes go to windows/system32/drivers/etc and open "hosts" file as administrator with notepad (Mac user: use Shift+Command+G and type /etc than open hosts file using TextEdit)
• remove the last to lines with word apple in it (or add # at the begining of line)
• safe the change
• go to itunes shift+ restore choose the custom ipsw (Mac user: alt+ restore)
• enjoy the restore with out any errors no 3014 or 1600 or any other error

Maybe, on Mac, we couldn't safe the change of hosts file or even worse, couldn't open it. In this case, 

open Terminal Apps

type

sudo cp /etc/hosts ./Desktop (enter your password)

sudo chmod 777 ./Desktop/hosts

edit hosts file in Desktop using TextEdit and safe it, back to Terminal

sudo rm /etc/hosts /etc/hostsOld

sudo cp ./Desktop/hosts /etc/hosts

Monte Carlo PI

 
c    calculating pi by throwing stones
c
 PROGRAM stones
 IMPLICIT none
c
c    declarations
 REAL*8 area, x, y, DRAND48
 INTEGER i, max, pi, seed
c
c    set parameters (number of stones, seed for generator)
 max = 1000
 seed = 11168
c
c    open file, set initial value, seed generator
 OPEN(6, FILE='pif.dat')
 pi=0
 call seed48(seed)
c
c    execute
 DO 10 i=1, max
    x = DRAND48()*2-1
    y = DRAND48()*2-1 
    IF ((x*x + y*y) .LT. 1) THEN
       pi = pi+1
    ENDIF
    area = 4.0 * pi/REAL(i)
    WRITE(6,*) i, area
 10  CONTINUE
  STOP
  END

PI on MPI

still trying...

 program main
      include "mpif.h"
      double precision  PI25DT
      parameter        (PI25DT = 3.141592653589793238462643d0)
      double precision  mypi, pi, h, sum, x, f, a
      integer n, myid, numprocs, i, ierr
c                                 function to integrate
      f(a) = 4.d0 / (1.d0 + a*a)

      call MPI_INIT(ierr)
      call MPI_COMM_RANK(MPI_COMM_WORLD, myid, ierr)
      call MPI_COMM_SIZE(MPI_COMM_WORLD, numprocs, ierr)


 10   if ( myid .eq. 0 ) then
         print *, 'Enter the number of intervals: (0 quits) '
         read(*,*) n
      endif
c                                 broadcast n
      call MPI_BCAST(n,1,MPI_INTEGER,0,MPI_COMM_WORLD,ierr)
c                                 check for quit signal
      if ( n .le. 0 ) goto 30
c                                 calculate the interval size
      h = 1.0d0/n
      sum  = 0.0d0
      do 20 i = myid+1, n, numprocs
         x = h * (dble(i) - 0.5d0)
         sum = sum + f(x)
 20   continue
      mypi = h * sum
c                                 collect all the partial sums
      call MPI_REDUCE(mypi,pi,1,MPI_DOUBLE_PRECISION,MPI_SUM,0, 
     &                  MPI_COMM_WORLD,ierr)
c                                 node 0 prints the answer.
      if (myid .eq. 0) then
         print *, 'pi is ', pi, ' Error is', abs(pi - PI25DT)
      endif
      goto 10
 30   call MPI_FINALIZE(ierr)
      stop
      end