NEW COMPUTER PROGRAM FROM NASA -- TURBINE DESIGN A computer program from NASA Lewis Research Center was developed for the preliminary design analysis of axial-flow turbines. The computations are based on mean-diameter flow properties and do not consider any radial gradients. Specific heat ratio is assumed constant throughout the turbine. For any given turbine, all stages, except the first, are specified to have the same shape velocity diagram. The first stage differs only in that the inlet flow is axial. The velocity diagram shape depends upon the speed-work parameter value and the specified type of velocity diagram. Any of three types of velocity diagrams can be specified: symmetrical, zero exit swirl, or impulse. Exit turning vanes can be included in the design. This program, inventory number LEW-11815, is written in FORTRAN 77 and can be ported to any computer with a standard FORTRAN compiler which supports NAMELIST. It was originally developed in 1972 on an IBM 7000 series computer running VM and is now available for IBM PC computers and compatibles running MS-DOS under Lahey FORTRAN, and DEC VAX series computers running VMS. Format statements in the code may need to be rewritten depending on your FORTRAN compiler. The source code and sample data are available on a 5.25 inch 360K MS-DOS format diskette. Program $500, documentation $15. -------------------------------------------------------- NEW COMPUTER PROGRAM FROM NASA -- METALLURGY An iron-, nickel-, or cobalt-based alloy composition can cause the alloy to form sigma phase when treated at high temperatures. Any sigma phase formation is undesirable when working with these materials, because it weakens the alloy. The PHACOMP algorithm was developed from the need to screen any hypothetical or developmental alloy for either sigma phase formation or the propensity for such formation. Based only on the alloy composition the algorithm is able to predict sigma phase formation. SUPER PHACOMP was developed at NASA Marshall Space Center after research into the many variations of the PHACOMP algorithm. The resulting program implements three of these versions, permitting comparison of results to give greater reliability to the predictions. Since certain calculations are common to each, the three versions were woven together for efficiency. While sigma phase prediction is its primary function, SUPER PHACOMP also performs other calculations of alloy properties. This program could benefit anyone working with alloy design. SUPER PHACOMP, MFS-26164, is written in BASIC for IBM PC series or compatible computers running MS-DOS v3.30 or later. No executables are included with the distribution. The source code should be compatible with any DOS-based BASIC language interpreter. SUPER PHACOMP requires 640K RAM for execution. This package is available on a 5.25 inch 360K MS-DOS format diskette. Program $100; documentation $11. -------------------------------------------------------- NEW COMPUTER PROGRAM FROM NASA -- SOFTWARE COSTING The cost of developing computer software consumes an increasing portion of many organizations' budgets. As this trend continues, the capability to estimate the effort and schedule required to develop a candidate software product becomes increasingly important. COSTMODL, from NASA Johnson Space Center, is an automated software development estimation tool which fulfills this need. COSTMODL accepts a description of a software product to be developed and computes estimates of the effort required to produce it, the calendar schedule required, and the distribution of effort and staffing as a function of the defined set of development lifecycle phases. This is accomplished by the five cost estimation algorithms incorporated into COSTMODL: the NASA-developed KISS model; the Basic, Intermediate, and Ada COCOMO models; and the Incremental Development model. This choice affords the user the ability to handle project complexities ranging from small, relatively simple projects to very large projects. COSTMODL, inventory number MSC-22010, was written for IBM PC compatibles, and it requires Turbo Pascal 5.0 or later and Turbo Professional 5.0 for recompilation. An executable is provided on the distribution diskettes. COSTMODL requires 512K RAM. The standard distribution medium for COSTMODL is three 5.25 inch 360K MS-DOS format diskettes. The contents of the diskettes are compressed using the PKWARE archiving tools. The utility to unarchive the files, PKUNZIP.EXE, is included. Program $600; documentation $29. -------------------------------------------------------- NEW COMPUTER PROGRAM FROM NASA -- NEURAL NETS The primary purpose of NNETS (Neural Network Environment on a Transputer System, NASA Johnson Space Center) is to provide users a high degree of flexibility in creating and manipulating a wide variety of neural network topologies at processing speeds not found in conventional computing environments. To accomplish this purpose, NNETS supports back propagation and back propagation related algorithms. The back propagation algorithm used is an implementation of Rumelhart's Generalized Delta Rule. NNETS was developed on the INMOS Transputer. NNETS predefines a Back Propagation Network, a Jordan Network, and a Reinforcement Network to assist users in learning and defining their own networks. The program also allows users to configure other neural network paradigms from the NNETS basic architecture. NNETS, inventory number MSC-21485, was written for the INMOS C compiler D711B version 1.3 or later (MS-DOS version). A small portion of the software was written in the OCCAM language to perform the communications routing between processors. NNETS is configured to operate on a 4 X 10 array of Transputers in sequence with a Transputer based graphics processor controlled by a master IBM PC 286 (or better) Transputer. A RGB monitor is required which must be capable of 512 X 512 resolution. It must be able to receive red, green, and blue signals via BNC connectors. NNETS is meant for experienced Transputer users only. The program is distributed on 5.25 inch 1.2Mb MS-DOS format diskettes. Program $500; documentation $29. -------------------------------------------------------- NEW COMPUTER PROGRAM FROM NASA -- ANTENNAS Accurate computer modeling of passive circular waveguide components is often required during the design phase for optimizing frequency response and/or determining the tolerance required on components in order to meet radio frequency specifications. Many circular waveguide devices can be represented either exactly or approximately as a series of circular waveguide sections which have a common center. In addition, smooth tapers and horns of arbitrary profile may be approximated by a series of small steps. The Scattering Matrix Program for Circular Waveguide Junctions, CWGSCAT, computes the scattering matrix for a series of circular waveguide sections. These sections must possess the same center, but the radius and length of each section is completely arbitrary. CWGSCAT, inventory number NPO-18708, is written in FORTRAN to run on IBM PC series computers and compatibles running MS-DOS. It requires 355K of RAM. The standard distribution medium is a 5.25 inch 360K MS-DOS format diskette. This program is a copyrighted work with all copyright vested in NASA. Program $500; documentation $16. -------------------------------------------------------- NEW COMPUTER PROGRAM FROM NASA -- IMAGE PROCESSING PC-SEAPAK from NASA Goddard Space Flight Center is a user-interactive satellite data analysis software package specifically developed for oceanographic research. The program is used to process and interpret data obtained from the Nimbus-7/Coastal Zone Color Scanner (CZCS), and the NOAA Advanced Very High Resolution Radiometer (AVHRR). PC-SEAPAK is a set of independent microcomputer-based image analysis programs that provide the user with a flexible, user-friendly, standardized interface, and facilitates relatively low-cost analysis of oceanographic satellite data. Version 4.0 includes 114 programs. The CZCS scanning radiometer aboard the NIMBUS-7 satellite was designed to measure the concentration of photosynthetic pigments and their degradation products in the ocean. AVHRR data is used to compute sea surface temperatures and is supported for the NOAA 6, 7, 8, 9, 10, 11, and 12 satellites. The CZCS operated from November 1978 to June 1986. CZCS data may be obtained free of charge from the CZCS archive at NASA/Goddard Space Flight Center. AVHRR data may be purchased through NOAA's Satellite Data Service Division. Ordering information is included in the PC-SEAPAK documentation. PC-SEAPAK, inventory number GSC-13320, has been under development since 1988. Version 4.0 was released in 1992, and is distributed without source code. It is available only as a set of 32 1.2Mb 5.25 inch IBM MS-DOS format diskettes. PC-SEAPAK is a copyrighted product with all copyright vested in the National Aeronautics and Space Administration. Phar Lap's DOS Extender run-time version is integrated into several of the programs; therefore, the PC-SEAPAK programs may not be duplicated. Three of the distribution diskettes contain DOS Extender files. One of the distribution diskettes contains Media Cybernetics' HALO88 font files, also licensed by NASA for dissemination but not duplication. Program $450; documentation $50. 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