Computers VISUAL BASIC

Overall, most of the requirements for a process spectrometer/analyzer are straightforward to implement, but they do require attention at the design level. Another important area, which is FTIR-specific, is the user interface and the need to provide for industry standard data communications. Standard software packages do exist for process instrumentation. For prototype development, and even for the front-end interface in a standalone mode of operation, software products, such as Microsoft s Visual Basic and National Instruments LabView, are also important instrumentation development tools. Note that National Instruments also provides important computer-based electronics and hardware that meet most of the computer interfacing, and system control and communications needs for modem instrumentation. 

In applying these equations and Fig. 1.1, please note that you are applying a proven method that has been used over several decades as reliable data. Henceforth, whenever you need to know a gas viscosity, you ll know how to derive it by simply applying this method. You may also use these equations in a computer for easy and quick reference. See Chap. 9 for computer programming in Visual Basic. Applying programs such as these is simple and gives reliable, quick answers. 

One other settling equation method proposed here and strongly endorsed is displayed in Fig. 4.8. This is the recommended method, and it is applied to both horizontal and vertical programs in Visual Basic in the PPE computer programs. 

The AirClr8 computer program s Basic language code listing is given in Fig. 5.13. This is a Quick Basic or common GW Basic code listing. With the exception of the input-output code, it is also applicable to Visual Basic. 

BASIC, or Beginners Algebraic Symbolic Instruction Code, was developed by Kemeny63 as a "baby FORTRAN" for simple computers (e.g., minicomputers). BASIC does not wait for the whole user-written program to be finished, but compiled each typed line as soon as typed. It was ideally suited for a simple learning environment. Microsoft VISUAL BASIC is a GUI-interfaced version. Microsoft QUICK BASIC 4.5 is much better than FORTRAN embodiments in accessing instruments for real-time data acquisition and control. 

Step four in the interfacing operation is the use of computer software to communicate with a device and to capture the information it sends for analysis and display. This can be done at a basic level using machine language or higher programming tools such as Visual Basic, but increasingly this capability is provided by manufacturers of instraments, measurement systems, or interface boards. This relieves the user of much of the effort in interfacing devices and allows efficient and easy set up of different experiments typically done in physical chemistry laboratories. As illustration, we consider two examples of measurement approaches that can be used in a number of the experiments in this book. 

Level 1 If the data is to be manipulated using spreadsheet macros, the spreadsheet application must be considered as a GAMP Category 5 component. Macros in Microsoft Excel are Visual Basic computer programs written specifically for that application. While they may be simpler than the other customized elements of the integrated CDS, they stiU carry the same liabilities. 

Newman S. and Lowenstern J. B. (2002) VolatileCalc a silicate melt-H20-C02 solution model written in visual basic for excel. Comput. Geosci. 28, 597-604. 

The model was created using the proprietary spreadsheet package Microsoft Excel together with the programming code Microsoft Visual Basic. It runs on a standard personal computer (200 MHz, 64 MB RAM). Individual worksheets are allocated to each system component sub-model these are described in the following sub-sections. Non-capital cost items such as labour, maintenance and overheads are based on functions derived by Toft [2]. All capital costs are corrected where necessary to a total plant cost basis using methods defined in the same work. 

The mathematical models of the components are carried out in the Excel-spreadsheet computation with Visual Basic macros. The theory of the models of is not new, but the combination of these models is not presented before. The calculation results are verified with measurements in a 40 kW,h test plant and in a 500 kWu, demonstration plant... 

So, a computational solution has been developed to provide valuable information on the statistical distribution of active variables, both controlled and manipulated. It consists, as shown in figure 2, of a Visual Basic tool, which gets data from the process historian and from the MPC configuration database. 

Fig. 9.3 Diversity of randomly selected library clones - VH genes. A unique computer algorithm was written in visual basic and incorporated as a module into Microsoft Excel for the purpose of sequence alignment and statistical analysis of Ronit 1 library clones (available from the authors upon request). In addition to identifying the source of each CDR1 and CDR2 and how much it had diversified (shown in22) the algorithm also calculated, plotted, and presented a statistical analysis the length distribution of VH (a), Vx (b) and VK (c) CDR3 of all the sequenced clones...

For evaluation of the experimental data a computer program written in Visual Basic was developed. This program allowed evaluating concurrently ten experimental curves, which were taken in one measurement cycle. The program allows fully automatic curve evaluation it finds index points on the curve, and calculates the interfacial tension with... 

Imperative Programming is a programming paradigm that describes computation as sequential statements that change a program state. Examples are FORTRAN, Pascal, C, and Visual Basic (see also Declarative Programming). 

The equations to be solved are first the Peng-Robinson equation of Eqs. 6.7-1 to 6.7-4 for the initial molar volume or compressibility, and then the initial number of moles in the tank using Eq. d of Illustration 6.5-2. The results, using the Visual Basic computer program described in Appendix B.I-2, the DOS-based program PRl described in Appendix B.II-1, the MATHCAD worksheet described in Appendix B.ni, or the MATLAB program described in B.IV included... 

Using the bubble point pressure option in the Visual Basic program of Appendix B.1-3, the DOS-based program VLMU, or the MATHCAD worksheet PRBUBP, and the computed composition for the liquid richer in n-decane, we obtain the following results for the three-phase coexistence region ... 

Updated computational tools. As in previous editions, I provide many opportunities for the use of personal computers in problem solving. The third edition of this book included MATHCAD worksheets and DOS-based Basic language (and compiled) programs. To these programs I have added Windows-friendly Visual Basic versions of those earlier programs that are easier to use and have greater capabilities. There is also a new Visual Basic pure-component database that can be used as a stand-alone program or accessed by the... 

Computer programming, as FORTRAN or Visual Basic, may be used to formulate mathematical functions of any complexity. This is a powerful feature of simulators often underestimated. An example is the study of steady state controllability directly from non-linear plant models (see Chapter 12). Different controllability measures can be calculated directly by programming, or by exporting data to other packages. 

In order to reveal the migration and diffusion law of gas in coal and describe the gas desorption and diffusion law accurately, the constant temperature dynamic coal particle gas adsorption and desorption experiment with different particle size was conducted in the coal gas adsorption and desorption experiment system. The gas emission is simulated and calculated with computer program developed by Visual Basic. The simulation results are compared with the experimental results. They provide the basis for the study of coal particle gas diffusion law and supply evidences for the further study of the gas emission law and gas outburst mechanism. 

A computer program is developed with Visual Basic based on finite difference calculation model and its corresponding boundary conditions. The program structure diagram is showed in Fig. 4 (Zhou Shining 1983). 

Since process simulators are used extensively in commercial practice, I have continued to include process simulation examples and homework problems throughout the text. I now teach the required three-credit, junior-level separations course at Purdue as two lectures and a two-hour conputer lab every week. The computer lab includes a lab test to assess the ability of the students to use the simulator. Although 1 use Aspen Plus as the simulator, any process simulator can be used. Chapters 2. 6, 8,10,12, 13. and 16 include appendices that present instructions for operation of Aspen Plus. The appendices to Chapters 2. 4, 5,15, and 17 have Excel spreadsheets, some of which use Visual Basic programs. I chose to use spreadsheets instead of a higher-level mathematical program because spreadsheets are universally available. The appendix to Chapter 18 includes brief instructions for operation of the commercial Aspen Chromatography simulator—more detailed instruction sheets are available from the author wankat purdue.edu. 

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