## Saturday, August 9, 2014

### how to run GFORTRAN on private machine

ทุกครั้งที่ใช้งานบน machine อื่น ให้ทำการ re-compile ก่อนทุกครั้งเสมอ ก่อนใช้งานนะ

[aips@localhost happy]$make -f makehappy make: `happy' is up to date. [aips@localhost happy]$ rm *.o
[aips@localhost happy]$!mak make -f makehappy gfortran -c -g -o happy.o happy.f gfortran -c -g -o filesearch.o filesearch.f gfortran -c -g -o stringlength.o stringlength.f gfortran -c -g -o new_paramfile.o new_paramfile.f gfortran -c -g -o open_intell.o open_intell.f gfortran -c -g -o message.o message.f gfortran -c -g -o banner.o banner.f gfortran -c -g -o grunge.o grunge.f gfortran -c -g -o filelength.o filelength.f gfortran -c -g -o write_stuff.o write_stuff.f gfortran -c -g -o numberize.o numberize.f gfortran -c -g -o stonum.o stonum.f gfortran -c -g -o filter.o filter.f gfortran -c -g -o polarise.o polarise.f gfortran -c -g -o error_calc.o error_calc.f gfortran -c -g -o brightness.o brightness.f gfortran -o happy happy.o filesearch.o stringlength.o new_paramfile.o open_intell.o message.o banner.o grunge.o filelength.o write_stuff.o numberize.o stonum.o filter.o polarise.o error_calc.o brightness.o ## Sunday, May 25, 2014 ### How to mount NTFS fileson Centos 6.5 Today, I am trying to mount NTFS files for the Centos 6.5 system and here is the useful tool for those who are newbies... --------------------------------------------------------------- P.S. credit ....http://www.tuxera.com/community/ntfs-3g-download/ 1) ### Download The latest stable version is ntfs-3g_ntfsprogs-2014.2.15, released on February 23, 2014. 2) ### Installation Linux: Most distributions include and use NTFS-3G by default. Please use that one unless it’s an old version. If you wish to install NTFS-3G from the source code then make sure you have installed the basic development tools (gcc compiler, libc-dev libraries). Then type: ./configure make make install # or 'sudo make install' if you aren't root Non-Linux: Please see the OS specific installation and source packages above. 3) ### Usage If there was no error during installation then the NTFS volume can be mounted in read-write mode for everybody as follows. Unmount the volume if it had already been mounted, replace /dev/sda1 and /mnt/windows, if needed. mount -t ntfs-3g /dev/sda1 /mnt/windows Please see the NTFS-3G Manual for more options and examples. You can also make NTFS to be mounted during boot by adding the following line to the end of the /etc/fstab file: /dev/sda1 /mnt/windows ntfs-3g defaults 0 0 ## Saturday, May 24, 2014 ### AIPS troubleshooting with Xterm (Centos ver.6) I am using Centos 6.0 and just updated all the system and trying to install AIPS. I found the problem ..... /home/aips/31DEC14/SYSTEM/UNIX/XASERVERS &.....xterm command not found...... It means you have to install XTERM for your operating system and then AIPS will work normally. ## Tuesday, January 21, 2014 ### Ubuntu 13.10 with no effect graphic and Linux command so on Task: Change Password For Other User Account You must login as root user, type the following command to change password for user vivek: # passwd vivek Install gnome-session-fallback and consider disabling the visual effects sudo apt-get install gnome-session-fallback ## Friday, December 6, 2013 ### Miktex 2.9+ Thai font (Sarabun PSK)+ ไม่ตัดคำ 1. เตรียมความพร้อมของระบบ สิ่งที่จะต้องเตรียมพร้อม 1. ระบบปฏิบัติการ Windows 98se/NT/Vista/7 (32bit และ 64bit) 2. MiKTeX รุ่น 2.9 ซึ่งจะต้องมี packet “XeLaTeX” หรือ “XeTeX” MiKTeX :: http://miktex.org/ 3. TeXstudio 2.4 ขึ้นไป http://sourceforge.net/projects/texstudio/files/texstudio/ 4. ชุดตัวอักษรไทย (Font) 13 อักษรแห่งชาติ :: http://www.f0nt.com/release/13-free-fonts-from-sipa/ 2. เมื่อได้แพ็กเกจตามต้องการ ติดตั้งทั้งหมดลงในคอมพิวเตอร์ ให้เลือก Miktex แบบ complete 3. ปรับแต่ง TeXstudio 1. เปิดโปรแกรม TeXstudio จากนั้นไปที่ Option > Configure TeXstudio… 2. จากนั้นเลือกหัวข้อ Commands ให้สังเกตที่ XeLaTeX หากไม่มีข้อความปรากฏให้ใส่ xelatex.exe -synctex=1 -interaction=nonstopmode %.tex 3. เลือกหัวข้อ Build ใน Meta Commands เลือก Build & View เป็น Complie & View และ เลือก Default Complier เป็น XeLaTeX 4. ทดสอบภาษาไทย ดัง code ต่อไปนี้ % ------ Test MikTeX 2.9 + ฟอนต์ TH SarabunPSK \documentclass[11pt,a4paper]{article} \usepackage{xltxtra} \XeTeXlinebreaklocale "th" \XeTeXlinebreakskip = 0pt plus 1pt % \setmainfont{TH SarabunPSK} \title{ครม.สั่งหน่วยงานราชการ ใช้ 13 ฟอนต์ไทย } \author{ใครก็ไม่รู้} \begin{document} \maketitle \section{ครม.เห็นชอบให้ทุกส่วนราชการโละฟอนต์ต่างชาติ บังคับใช้ 13 ฟอนต์ไทยในงานราชการ ระบุป้องกันละเมิดลิขสิทธิ์} นายวัชระ กรรณิการ์ รองโฆษกประจำสำนักนายกรัฐมนตรี เปิดเผยว่า ที่ประชุม ครม.เห็นชอบให้หน่วย งานภาครัฐทุกหน่วยดำเนินการติดตั้งฟอนต์สารบรรณและฟอนต์ อื่น ๆ ทั้งหมด จำนวน 13 ฟอนต์ ของ สำนักงานส่งเสริมอุตสาหกรรมซอฟต์แวร์แห่งชาติ (สอซช.) หรือ SIPA และกรมทรัพย์สินทางปัญญา เพิ่มเข้าไปในระบบปฏิบัติการ Thai OS (Thai Operating System) และใช้ฟอนต์ดังกล่าวแทน ฟอนต์เดิม ตามที่กระทรวงเทคโนโลยีสารสนเทศและการสื่อสารเสนอ โดยให้ติดตั้งและใช้งานให้แล้วเสร็จ ก่อนวันที่ 5 ธันวาคม 2553 ทั้งนี้ สืบเนื่องจาก ปัจจุบันส่วนราชการจำนวนมากมีการใช้ฟอนต์ที่หลากหลาย ไม่มีมาตรฐานในเอกสาร ทางราชการ อีกทั้งยังมีหน่วยงานราชการหลายแห่งใช้มาตรฐานฟอนต์ของบริษัทเอกชนที่ผูกขาด ลิขสิทธิ์ เช่น Angsana อาจมีปัญหาเรื่องการฟ้องร้องละเมิดลิขสิทธิ์ได้ด้วยเหตุดังกล่าว จึงได้มีการพัฒนาและมี การประกวดแข่งขันฟอนต์ ซึ่งเป็นการส่งเสริมให้เกิดการใช้ Open Source Software ที่เป็นซอฟต์แวร์ เสรีให้ส่วนราชการไทยประกาศมาตรฐานเอกสารดิจิตัลและรูปแบบ ของฟอนต์ที่ไม่ขึ้นกับระบบปฏิบัติการ และลิขสิทธิ์ของบริษัทใด ๆ เพื่อความภาคภูมิใจในความเป็นชาติและเอกลักษณ์ของความเป็นชาติไทย ซึ่งในขณะนี้มีฟอนต์ที่ส่วนราชการไทยสามารถเป็นเจ้าของและพร้อม แจกจ่ายให้ กับผู้ประสงค์จะใช้งานรวม 13 ฟอนต์ ดังนี้ \end{document} -------------------------------------------------------------------------------- These information modified from นายดรัสวิน วงศ์ปรเมษฐ์ สาขาคอมพิวเตอร์และเทคโนโลยีสารสนเทศ คณะวิทยาศาสตร์ มหาวิทยาลัยราชภัฏบุรีรัมย์. Thanks for the useful knowledge :D ## Wednesday, November 27, 2013 ### Adding Disks in AIPS ### Adding Disks in AIPS In order to add disks to your AIPS system, you have to change a few things - Create new folders for the disks in your$AIPS_ROOT/DATA drive.  Folders should be of the format HOSTNAME_#.  Use the same syntax as folders that currently exist.

- You need to copy the file SPACE from one of your existing data areas to all of the new ones you create.

- Enter the new disk area into the two files DADEVS.LIST and NETSP.  Follow the syntax of other entries in the files.  Also, each file has instructions included within.

And that's it.  Now when you run aips and type indisk you will see all of the new data areas that you've created.

--------------------------------------------
This information copied from http://brandeisastro.pbworks.com/w/page/14977086/AIPS%20Management.

## Tuesday, September 24, 2013

### a low cost Pulsar Machine (by James VanProoyen, N8PQK)

A pulsar machine (or pulsar detection system) is used at many of the large radio
observatories around the world. Some of these pulsar machines are well known for the
work that has been done such as the Penn State Pulsar Machine at Arecibo. Others are
just coming on line, such as PuMa, located in the Netherlands. This paper presents a low
cost Pulsar Machine for use at smaller observatories just entering the field of pulsar
research.
·         Why Study Pulsars?
Why would any one want to study pulsars? They are for the most part very distant objects
that can be seen only with large telescopes (radio or optical). What effect could these
possibly have on us? Questions I am often asked. A pulsar, for it’s size, around 10 to 20
km in diameter (6 to 12 miles) is one of the most energetic objects in the universe. It is
literally a physics laboratory in space. Reference 1 has additional information pulsars.
Now let’s apply this to one of our most pressing problems today - clean, efficient, low
cost energy. The study of these objects could lead us to a much more efficient source of
power. Maybe a tiny pulsar in a shoe box that can power you car and never needs
refueling that is so strong that, when your car wears out, you just unplug it and put it in
you new car. Speculation? Yes it is, but we will never find these new sources unless we
look, and I believe that pulsars may be the right place to look.
·         What is a Pulsar Machine?
A radio telescope has several parts. The antenna, which collects the signal, a low noise
amplifier (LNA) that amplifies the signal, the receiver (or converter) that converts the
signal to a lower (or intermediate frequency), and finally, the backend which converts
the intermediate frequency to some type of audio signal. A pulsar machine (or pulsar
backend) is an additional piece of equipment that attaches to the radio telescope and
provides additional processing to allow the detection of pulsars. A pulsar machine may
generally be defined as hardware and/or software that allows the detection of pulsars.
·         Past Pulsar Machines
Pulsar machines have been developed at Pennsylvania Statue University as well as
Berkeley Caltech for almost 30 years. They are deployed at the major observatories
around the world. Reference 3 has additional information on some of early pulsar
machines.
·         Current Pulsar Machines
One of newest is the PuMa Westerbrok Synthesis Radio Telescope in the Netherlands.
There are also major Pulsar Machine at Green Bank and Arecibo.  Pulsar Machines for the Amateur Radio Astronomer:
There have been several efforts by amateur radio astronomers to build such machines.
For some of us, the detection of pulsars is the “Quest for the Holy Grail” of amateur radio
astronomy. There are a number of notable efforts:
- James C. Carroll (A Post Detector Pulsar Extractor – SARA Paper)
- Robert M. Sickels (Pulse Catcher – SARA Paper)
Current Amateur Radio Astronomy Pulsars efforts (including the author):
- P. Ibelings and M. Wheatley at the PARI Observatory.
- Jim Van Prooyen and Rich Nagel at the Grand Rapids Radio Observatory.
·         The low cost Pulsar Machine
The design of the pulsar machine involved a number of design trade-offs to arrive at a
system that was low cost and usable with a small radio telescope. The parameters that
- Observation frequency
- Analog vs. Digital electronics
- Band width
- Dispersion issues
- Algorithms for processing the data
- Filter design
- Search methods
- Low Cost Processing Technologies
·         Observation Frequency
The selection of an observation frequency presents a unique set of problems for the
amateur radio astronomers. The issues include:
1. More signal to work with at the lower frequencies.
2. Less distortion of the signal at higher frequencies.
3. Equipment costs are less at the lower frequencies.
4. Much more gain for a given size dish antenna at higher frequencies.
There is no one good choice, pulsars have been observed at frequencies from a few
megahertz to the high gigahertz.
·         Analog vs. Digital
The first pulsar machines had a large number of analog signal processing elements.
Today most of this is done using digital technology. In general a digital system will have
a lower cost of acquisition then analog systems.
·         Wide Band vs. Narrow Band
Many pulsar machines use wide bands, and it makes sense from a systems view. The
more signal you can put into the system, the greater the sensitivity. Some are as wide as
100 MHz. But there are problems here, such as how you are going to digitize a wide
signal band and keep the cost under control. The other problem is interference from other
sources, when you are not observing in a radio quite zone. We use a narrow band
approach to the problem. This allows us to keep the cost very low and it keeps out the local radio and TV stations. However, this has a cost in that it we need to observe for a
long period of time before we see a detection. Generally, one hour of observation is used
to make sure we have the data needed for a detection.
·         The Dispersion Issue
The narrow band approach means that dispersion is not an issue. We use a bandwidth
of 75 kHz. We are currently studying bandwidths of only 30 kHz for the next generation
receiver. This receiver front end will be build by Radio Astronomy Supplies some time in
the winter of 2008/2009.
·         Fast Folding Algorithm (FFA)
This is a computer algorithm that is the heart of the system. It allows for the detection of
periodic events within time series data. The algorithm was developed by David H. Staelin
in 1969. References 4 and 5 have additional information on the development of the FFA.
·         Filter Design
The pulsar machine has a filter that processes data after the FFA. The filter is unique to
this pulsar engine. It is called a Jakeway filter, named to honor Jarry Jakeway, who was
my mentor during its design in 2002/2003. This is an efficient recursive filter for use with
noisy data sets.
·         Search Methods
The pulsar machine supports two search methods, targeted and non-targeted. The
targeted search has been fully developed and is optional. The non-targeted processing of
the pulsar machine will be the subject of future papers. It will use a Parameter Space
Search Algorithm (PSSA) that is still under development. This version of the Pulsar
engine will require the use of advanced computer technologies that are now available,
such as Beowulf, GPU’s, and other Parallel Processor technologies.
·         Deployment of the Pulsar Engine
One of the major issues has been how to deploy the Pulsar Engine (i.e. put it in to use by
other members of SARA). Due to the fact that it is still under almost continuous
development and the regulations on use of such technology (ITAR), we have arrived at
the following model for it use:
- Members of SARA may send observations to an FTP server for processing by the
Pulsar Engine. Data sent to the FTP server must be in one of the supported data
formats. There will be more information on this in the SARA Journal some time
this Fall.
- Processing produces histograms, using of MS Excel or JPG files and will be
posted to the FTP server for downloading. This processing may take anywhere from
24 to 48 hours for turnaround.  The following is a example of the output from the Pulsar Engine:
Summary of the observation histogram of pulsar B0031-07 pictured above:
This is a pulsar with a period of 0.9429509945998 seconds. This pulsar has three modes
of drifting sub pulses. This can be seen between index 95, and 103, (on the x-axis) and
again between 161, and 172. It also produces giant pulses approximately once in 800
periods (~ 754.3608 seconds). Due to the folding of the data over an observation period
of 3600 seconds there should be several giant pulses visible in the plot, this is supported
by the data at index 118 and 183 (on the x-axis).
·         Conclusion
The study of pulsars is fascinating and do-able for the amateur astronomer. And, being
incredible energy-producers for their size, they may have implications for energy
production on our own planet in the future. In this paper, the reader has been brought upto-date with current work and given a glimpse of the future in the study of Pulsars. If
you have a radio telescope and would like to be part of the project please send an e-mail

to me at grro1@dnx.net.