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CHANDRA | STARCAL : Stellar
Structure Software by James A. Green. Source Code Included
NUCLEAR : Nuclear
Effects software, Asteroid/Comet Destruction Problem, Asteroid Deviation.
CALCULATING PI :
Four methods for calculating pi = 3.14159...
Structured
Programming Philosophy : Easy-to-understand, modify, and improve.
Windows-compatible.
CHANDRA, press here for free chandra.zip download. 
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Stellar structure
software for Windows, with executable module chandra.exe, source code
chandra.cpp in C/C++ (Borland C++ 3.1 format), and chanread.txt readme file. You
will require WinZip to unzip chandra.zip. Search for & download free WinZip
at CNET. CHANDRA is stellar structure
software for collapsed-objects by the method of Chandrasekhar and Fowler,
including white dwarfs, neutron stars, and objects with more exotic equations of
state. It includes rotations and chemistry selection, preparing an overall
report file chandra.txt and a smaller report presented to the screen of your
terminal. If specified, CHANDRA also generates a detailed center-to-surface
structure file for variables like temperature, pressure, density, and so forth.
This download module includes the source code file chandra.cpp, which the user
may modify and recompile to handle new equations of state, modified gravitation
model, as desired. The complete set includes the book CHANDRA: CHANDRASEKAR SETS
OF WHITE DWARFS AND SUPERNOVA CORES by James A. Green, available for
$52.86 from Greenwood Research
Books & Software, or from many other bookstores and dealers. The book
CHANDRA includes this free downloadable software on diskette, plus a tutorial on
the theoretical astrophysics treated by the software, letters from S.
Chandrasekhar himself to the author written while the program was being
composed, and a free copy of the old 5th edition of GRAVITATION & THE
ELECTROFORM MODEL in an appendix.
Buy
the $52.86 hardback edition of CHANDRA from Amazon.com
Buy
the $45.86 paperback edition of CHANDRA from Amazon.com. | Other bookstores | Order Direct
STARCAL - press for free starcal.zip download.
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The starcal.zip
package includes starexp.exe executable module for Windows and starexp.cpp
source code in Borland C/C++ 3.1, as well as a starcalreadme.txt file. The
download requires WinZip to upzip the software. Search for and download WinZip
at CNET. This edition of the STARCAL software
allows the user to enter the name of the star, the distance or parallax of the
star, the spectral type, and the visual magnitude along with a chemistry
specification. The chemistry spec may be simply standard galactic halo or
galactic composition, or the user may specify the chemistry in detail. The
program applies bolometric corrections for atmospheric absorption to the visual
magnitude, then computes a large array of model variables for the star,
including the radius, luminoisity, absolute magnitude, surface temperature,
central and average densities, and other measures. It uses the chemistry
specification to compute the nuclear luminosity of the star from the inside out,
using stellar structure theory and formulae for nuclear cross-sections. In
addition, it prepares supernova forecasts for stars over 6.3 solar masses based
on the stellar lifetime formulae that apply to the star, and calculates many
details of the appearance of a Type II supernova explosion that might result,
including the projected luminosity of the supernova, the visual magnitude over
time, the probability of explosion in the next century, and so on. The program
generates a report file starexp.txt that describes internal structure and fusion
process cross-sections together with the supernova forecasts. It also makes a
condensed report to the screen. The nuclear luminosity calculations work best
with dwarf stars like the sun that run primarily on p-p fusion. Red giant
calculations are good for many variables, but not optimum with regard to nuclear
luminosity. Instead, the program diagnoses the structural characteristics of the
red giant deviating from normal dwarf structure. The program is useful for
preparing or correcting astronomical charts incorportating astrophysical
information. Some authors, for example, do not include bolometric corrections
for atmospheric absorption of stellar radiation before computing the absolute
magnitude, radius, and mass of a star. In addition STARCAL software makes
charting of supernovae progenitors possible (Type II only), along with other
novel applications.
The complete set includes the book Thermonuclear Fusion in
Stars by James A. Green from Greenwood Research, also available
through Amazon.com and other dealers and bookstores.
Buy
the $80.88 hardback edition with software from AMAZON.
Buy
the $70.00 paperback edition with software from AMAZON. | Other bookstores | Order Direct
NUCLEAR - Press to download nuclear.zip effects software.
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This nuclear.zip
package includes nuclear.exe nuclear effects software, aster3.exe asteroid
destruction problem software with aster3.cpp source code, orbit.exe asteroid
deviation software with orbit.cpp source code, and a readme.txt file. All source
code is given in Borland C/C++ 3.1 for a Windows environment. The nuclear
effects software computes the effects of thermonuclear weapons as a function of
the weapon kilotonage, computing many results such as maximum fireball size,
maximum fireball radiance, radiation effects, crater sizes, size of waves raised
by underwater bursts, cavern sizes gouged by bursts underground, 5 psi radius,
and so on. The program generates a report file nuclear.txt tracing the entire
session that may printed using Notepad. Richter magnitude and other unusual
measures are given. The asteroid destruction software computes the impact
effects of asteroids on the surface of the earth, including crater size range,
crust rupturing parameters, depth of global dust coating, richter magnitude of
the impact, and many other interesting measures. Also given is the megatonage
required for asteroid destruction using a 2-warhead pinching scheme, and the
number of space shuttle cargo loads of reactants needed to ferry such hardware
into orbit. The orbit.exe asteroid orbit deviation software computes the path
deflection produced by a given megatonage applied normal to the path of the
asteroid. Save the Earth your way! The complete package includes The Effects of
Thermonuclear Weapons by James A. Green from Greenwood Research with many
government-released charts and graphs as well as privately computed ones for
various effects of nuclear weapons and the complete software package on
diskette. Based on commonly available declassified data made available by the
Department of Defense and the Department of Energy.
Buy
the $35.00 hardback with software from Amazon.com. | Other bookstores | Order Direct
CALCULATING PI - press for free
download. | Back to top
This software
includes archpi.exe, chinpi.exe, leibnitz.exe, and newton.exe together with the
corresponding Borland C/C++ 3.1 source code modules for calculating pi by the
method of Archimedes, the Chinese method, by the method of Leibnitz, or by the
method of Newton. The most rapidly converging method is due to Archimedes,
involving inscribing a circle between interior and exterior polygons. The
software contains explanations and it is entertaining to observe the relative
rates of convergence.
The corresponding textbook Calculus for the Systems
Architect: An Essay on the Eternal by James A. Green from Greenwood Research contains the
development of the calculus in addition to entertaining sections on the history
of the calculation of pi and the application of calculus to problems in
engineering and science.
Buy
the $59.00 hardback with software from AMAZON.com. | Other bookstores | Order Direct
STRUCTURED PROGRAMMING PHILOSOPHY: | Back to top
This code is
written to be easy-to-understand, easy-to-modify, easy-to-maintain and extend.
It leans toward the structured design philosophy popularized by Glenford Myers
of the IBM Research Institute. It is user- modifiable code written to be simply
passed on to another generation of experimenters. Object-Oriented design methods
emphasizing barriers difficult for neophytes to quickly scale have been avoided.
If the user fouls up, the old original code can always be downloaded from
online, re-modified, and recompiled with a Borland C++ 3.1 - compatible
compiler. This has conceptual advantages for scientists under conditions in
which security is not a paramount concern. A structured table of contents is
provided, and I have loosely adhered to the idea of writing short modules that
are functionally cohesive, with well-defined inputs and outputs.
Greenwood Research | Jim Green's Home Page | Announcements | Dealers | Order Direct