This accurate modeling of thermodynamic properties is particularly important in the separation of non-ideal mixtures, and ASPEN has a large data bases of regressed parameters. ASPEN can handle very complex processes, including multiple-column separation systems, chemical reactors, distillation of chemically reactive compounds, and even electrolyte solutions like mineral acids and sodium hydroxide solutions.
ASPEN does not design the process. It takes a design that the user supplies and simulates the performance of the process specified in that design. Therefore, a solid understanding of the underlying chemical engineering principles is required to supply reasonable values of input parameters and to evaluate the suitability of the results obtained.
This information could come from an approximate method, such as the McCabe-Thiele approach, general modeling of the T-x-y behavior, or residue curve maps.
ASPEN cannot tell you how many stages to use for a given separation except in approximate cases using conceptual design. Usually, you must set the number of stages and see what type of separation results.
Some preliminary or 'back of the envelope' calculations are generally recommended. MSU has a variety of Aspen packages for different simulations. Briefly, here are the programs and capabilities:. Aspen Adsim - Fixed bed adsorption for pressure swing adsorption, etc. Aspen Chromatography - Fixed bed adsorption, simulated moving bed chromatography. Runs independent of Aspen Plus. Aspen Custom Modeler - A utility to permit the creation of user unit operations. Aspen Dynamics - Unsteady-state simulator.
Aspen Plus - Steady-state process simulator. Aspen Properties - Modeling of properties and phase equilibria. Incorporated into most other components, though it can be run as a stand-alone subset. All of the phase equilibria and mixture property methods discussed on this site are accessible in either Aspen Plus or Aspen Properties.
Aspen Polymers - Modeling of polymerization reactors and polymer thermodynamics. This package is available within Aspen Plus or Aspen Properties rather than via an external menu. BatchSep - Batch distillations. Runs independently of Aspen Plus. Normally undergraduate student projects will involve Aspen Plus or Aspen Properties. To start either of these packages, be sure to look for the corresponding User Interface on the start menu.
This document is intended to be an overview. ASPEN has extensive online help. Generally, pressing F1 on an input form will provide the appropriate help screen to check units or relate the parameter names to parameters names used in literature. They do not respond to student requests. Work through your instructor and TA for getting answers to your questions.
Most common tasks are covered. The screenshots in this tutorial and some of the menus are outdated. However the major steps of working with Aspen are similar to what is depicted below.
To start either of these packages, be sure to look for the corresponding start menu item. If you encounter an error on startup using one of the engineering remote desktops, take note of the server name on the desktop and call DECS to inform them of the detailed error message and the server name.
To demonstrate how to build a process simulation using ASPEN, we will develop a distillation column for separation of ethanol and water. The first step in developing a simulation is to develop the process flow diagram PFD , which consists of the unit operations blocks and streams that feed and connect the blocks.
The blocks are listed by category at the bottom of the main window columns, reactors, etc. There are a wide variety of block available. The first step is to choose the column type for the ethanol-water separation. Click on columns to view the different column simulations available.
The two types of common interest are 'DSTWU', which is the multicomponent shortcut distillation method, and 'RadFrac', which is the rigorous simulation of a single column. Choose 'RadFrac'. Click on the small arrow on the right side of 'RadFrac' to select the column icon that you want to use on the PFD. The menu will disappear; move the crosshairs to the desired location on the main flowsheet window and click the mouse button.
Next you have to add streams to the block. For this example, set up the feed stream: choose the Material stream by clicking on it. The column will now show arrows where the stream can be connected; red arrows indicate required streams as shown in Figure 3. To set up the feed stream to the column, move the crosshair on top of the red feed position and left click once. Indeed, tonal perception depends upon several factors. Our approach to pitch contour stylization takes into account.
The stylization shows the effect of a change of the model parameters on the estimated perceived pitch contour. In speech communication, utterances are heard just once. There is no time for the listener to reflect on the auditory properties of the signal. This situation differs from that of a hearing experiment, where a stimulus is usually repeated several times and separated by long silent pauses.
How then should the glissando parameter be chosen in order to obtain a correct representation of pitch perception in continuous speech? Resynthesized utterances TD-PSOLA using F0 stylizations for alternative settings of the above thresholds, and presenting them to listeners together with a resynthesis of the original utterance, one can determine the glissando threshold for which listeners are unable to distinguish the stylized pitch contour from the original one.
To take into account the impact of a silent pause on the perception of the preceding pitch movement, the glissando threshold may be adjusted dynamically, depending on the presence of a pause. The stylization by Prosogram has been used for automatic transcription of pitch contours and intonation. A first type, called Polytonia Mertens, , indicates the pitch level and pitch movement of each syllable.
Pitch levels are determined on the basis either of the speaker's pitch range and pitch intervals in the local context of a syllable ad within the syllable. A second type identifies positions in prosodic structure, such as stressed syllable, pre-stress syllable, and prosodic boundary, and reinterprets Polytonia's pitch levels and movements in terms of such positions. Prosogram may be applied to any language, because it analyses the acoustic signal produced by the speech organs, which are basically the same for all people, irrespective of their language.
It has even been used in the study of sounds produced by animals bears, whales , music instruments, as well as the singing voice. Some sounds may occur more frequently in one language than in the other for instance, asian tone languages have lots of glides. And some languages have quite complex consonant clusters, while others mostly use CV syllables. This affects syllabification to some extent, but the impact on pitch stylization will still be limited, because of the relatively low intensity of many consonants.
The Praat picture window is used only as a buffer for drawing the image, which is immediately saved in a graphics file. Then the picture window buffer is cleared to prepare for the next drawing. To view the prosograms saved in the graphics file s , read the following section of the Users's guide: Viewing and printing prosograms. I hope that helps, Lee!!! Please let me know if you have any more questions. Alice xx.
Is it possible to reuse the guide but with heavier weights? And as everyday is a Total body Workout , how do muscle groups get targeted? Good luck with what you are doing now! Hi Robin! You are supposed to use the heaviest weights you can with this guide.
The last rep should be a struggle. A total body workout just means that there are both upper and lower body exercises in the guide. Does that make sense? Hey girly! This guide sounds really promising, just curious on how it compares to BBG? I am currently redoing BBg but I am not finding myself enjoying the exercises at all. Any thoughts? You have to push yourself to lift heavy to see maximum results whereas in the BBG you use really light weights. Hope that helps! I really think to start this guide.
Is it clear how to do the exercises and the repetitions? Hi Laila! The beginning of the guide offers an explanation! Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam.
Learn how your comment data is processed. Phase 1 Phase 1 was personally my favorite portion of the guide. Phase 2 Phase 2 really cranks up the heat — two more exercises are added so you are doing seven strength exercises in total , and you have to do more reps during each set.
Let me know if you have any questions — honestly yours, Alice Thank you for all of your support! Honestly Fitness. This is why you Need a Standing Desk November 15, January 25, Reply Cassie April 11, at pm The message of this Pure Curve Guide is absolutely wonderful: women can look strong and still retain their femininity! Reply kat April 27, at am hi just wondering about the structure of the curve guide- does she have a workout schedule for every day of the week?
Simultaneous Equations. Stealth Quadratics. The Discriminant. Straight Lines. Graphing Inequalities. Binomial Expansion. Polynomial Division and Factor Theorem. Laws of Logarithms and Logarithmic Equations. Solving Exponential Equations. Exponential and Logarithmic Equations. Exponential Modelling. Reduction To Linear Form. Transformation Of Functions.
Sine and Cosine Rules and Area of a Triangle. Introduction To Trigonometric Equations. Trigonometric Equations and Identities. Differentiation Mixed. Differentiation From First Principles. Stationary Points. Tangents and Normals to Curves. Practical Applications of Differentiation. Definite and Indefinite Integrals. Finding the Equation of a Curve Given the Differential.
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