# Software Listing: Trapezoidal

Specific-Energy in Trapezoidal Canals is an application that was especially designed to help you have the alternate depth for a trapezoidal canal calculated on the spot.

The program plots diagrams for specific energy based on the input data you provide in the main window of the software.

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• Platform: Win7 x64, Windows 7, WinOther, WinVista

This code computes the approximation of the convolution integral (*) between two functions, f(t) and g(t), sampled at the times t1,t2,...,tm (unit spacing), via the trapezoidal quadrature rule. To compute the integral with other than unit spacing, multiply the result by the spacing increment. Computation is very fast because it has been used the built in function conv(). To conv() result has then been added what misses for trapezoidal approximation. Convolution integral is defined as: (*) h(t)=int{f(tau)*g(t-tau)}dtau..

• Platform: Matlab, Scripts

CapSim is an open-source planar physics simulator designed for academic purposes. The main features are: * Simple yet full featured, %100 Matalab code for readability and modifiability, perfect for research. * Planar capsules (a capsule is a segment with a radius) can be connected in arbitrary topologies, free floating or anchored * All computation are done in a minimal coordinate system, i.e. angles and centers-of-mass, no "constraint stabillization" * Computation of centripetal and coriolis Jacobians allows us to use semi-implicit Euler integration [1], which is just as cheap as Euler, yet considerably more accurate.

• Publisher: Yuval
• Date: 18-01-2013
• Size: 20 KB
• Platform: Matlab, Scripts

A new general IIR digital fractional order differentiator/integrator based on continued fraction expansion of weighted operator which is mixed scheme of the trapezoidal (Tustin) rule and the backward difference (Euler) rule. For more details see books: [1] Ivo Petras, Fractional-Order Nonlinear Systems: Modeling, Analysis and Simulation, Springer, Series: Nonlinear Physical Science, 2011, ISBN 978-3-642-18100-9. http://www.springer.com/engineering/contro...8-3-642-18100-9 [2] Riccardo Caponetto, Giovanni Dongola, Luigi Fortuna and Ivo Petras, Fractional Order Systems: Modeling and Control Applications, World Scientific, Singapore, 2010, ISBN 978-9-814-30419-1.

• Publisher: Ivo Petras
• Date: 05-03-2013
• Size: 10 KB
• Platform: Matlab, Scripts

A new general IIR type digital fractional-order differentiator and integrator based on power series expansion of the trapezoidal (Tustin) rule. For more details and help write: >> help dfod3 See also my previous digital fractional-order differentiators and integrators: http://www.mathworks.com/matlabcentral/fileexchange/3672 http://www.mathworks.com/matlabcentral/fileexchange/3673 or more information in the article: http://www.advancesindifferenceequations.c...t/2011/1/652789.

• Publisher: Ivo Petras
• Date: 07-01-2013
• Size: 10 KB
• Platform: Matlab, Scripts

OpenRocket is an free, fully featured model rocket simulator that allows you to design and simulate your rockets before actually building and flying them.

OpenRocket features a full six-degree-of-freedom simulation, realistic wind modeling, a multitude of different components including free-form fins and canted fins, clustering and staging. Read more about its features and see screenshots.

OpenRocket is an Open Source project licensed under the GNU GPL. This means that the software is free to use for whatever purposes, and the source code is also available for studying and extending.

• Platform: WinOther

This is an application for calculating critical depth in open channels flow. It can be used for calculating critical depth in four section types :

Rectangular : critical depth will be computed using explicit formula.
Triangular : critical depth will be computed using explicit formula.
Trapezoidal : critical depth will be computed using Newton method.
Circular : critical depth will be computed using try and error method.
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• Platform: WinOther
• S_Merge
• Price: 24

S_MERGE is a versatile tool for merging up to 8 images or text. Useful for inserting a watermark in your pictures. Total flexibility in alignment of the images such as scaling, relative positioning and rotation is allowed with many options available for blending the images together. Collaging of the images is easy with options to set number of columns and rows and the amount of gap between images. Apply invidual image options such as cylindrical panoramic projection, overlaying a dotted and/or a solid line grid on to the image, pincushion/barrel distortion correction, skewing and trapezoidal distortion.

• Platform: Win7 x32, WinOther, WinVista

GBW32 V5.0 is the update to GBW32 v4.0. GBW32 V5.0 is a 32 bit Windows 3D Finite Element program that uses standard third order beam and truss elements to model a wide range of Civil and Mechanical structures. The graphical user interface is powerful and easy to use to quickly model a structure, apply loads and constraints, and analyze the model. GBW32 V5.0 supports release nodes for all loadings, batch analysis, auto analysis, has an undo/redo feature and a built in property section calculator. Displacements, loads, stress information and animation are available to determine the effect of the applied loading and constraints.

• Platform: WinOther

OpenRocket is an free, fully featured model rocket simulator that allows you to design and simulate your rockets before actually building and flying them. OpenRocket features a full six-degree-of-freedom simulation, realistic wind modeling, a multitude of different components including free-form fins and canted fins, clustering and staging. Read more about its features and see screenshots. OpenRocket is an Open Source project licensed under the GNU GPL. This means that the software is free to use for whatever purposes, and the source code is also available for studying and extending. OpenRocket needs help to become even better.

• Platform: WinOther

rrlu computes a rank revealing LU factorization of a general m-by-n real full matrix A using partial pivoting with row and column interchanges. The factorization has the form A(P,Q) = L * U where P and Q are permutation vectors, L is lower triangular (lower trapezoidal if m > n), and U is upper triangular (upper trapezoidal if m < n). if VERSION = 0 then L has unit diagonal elements and the matrix U takes form U = [ U1 U2 ] (*) [ 0 0 ] where U1 in upper triangulal with nonzero elements on diagonal if VERSION = 1 then U has unit diagonal elements and the matrix L takes form L = [ L1 0 ] (**) [ L2 0 ] where L1 in lower triangulal with nonzero elements on diagonal rrlu allows to find left or right null space faster than QR or SVD decomposition, but in some cases is less accurate.

• Platform: Matlab, Scripts

QMSys Threads 5 is a powerful thread engineering program especially designed for engineers, metrologists, quality control managers, and machinist. The software aids the working process by saving time and preventing human errors in the determination of thread parameters. The results are based on international standards and comprise information about values and tolerances of threaded products. Types of threads:

- Metric Threads (M, MJ, with large clearance, galvanized) - Unified Threads (UNC, UNF, UNEF, UN, UNR, UNJC, UNJF, UNJEF, UNJ, NC-5) - Whitworth Threads (BSW, BSF, Whit.S., Whit.

• Platform: Win2000, Win7 x32, Win7 x64, Windows Server, WinOther, WinVista, WinVista x64

QMSys Threads and Gauges 5 is a powerful thread engineering program especially designed for engineers, metrologists, quality control managers, and machinist. The software aids the working process by saving time and preventing human errors in the determination of thread parameters. The results are based on international standards and comprise information about values and tolerances of threaded products, working gauges, plug and ring gauges as well as checking gauges. Types of threads:

- Metric Threads (M, MJ, with large clearance, galvanized) - Unified Threads (UNC, UNF, UNEF, UN, UNR, UNJC, UNJF, UNJEF, UNJ, NC-5) - Whitworth Threads (BSW, BSF, Whit.

• Platform: Win2000, Win7 x32, Win7 x64, Windows Server, WinOther, WinVista, WinVista x64

QMSys Threads and Gauges is a powerful thread engineering program especially designed for engineers, metrologists, quality control managers, and machinist.

The application will help the working process by saving your time and preventing human errors in the determination of thread parameters.

The results are based on international standards and comprise information about values and tolerances of threaded products, working gauges, plug and ring gauges as well as checking gauges.

· Metric Threads (M, MJ, with large clearance, galvanized)
· Unified Threads (UNC, UNF, UNEF, UN, UNR, UNJC, UNJF, UNJEF, UNJ, NC-5)
· Whitworth Threads (BSW, BSF, Whit.

• Platform: WinOther

DroidTesla is a simple and powerful SPICE engine.
SPICE is an acronym for Simulation Program with Integrated Circuit Emphasis
and was inspired by the need to accurately model devices used in integrated circuit design.

DroidTesla simulator solves basic resistive circuits using Kirchoffâ€™s Current Law (KCL)
in much the same way a student in a circuits class would,the simulator systematically forms a matrix in accordance
with KCL and then proceeds to solve for the unknown quantities using various algebraic
techniques such as Gaussian elimination and sparse matrix techniques.

For non-linear components, such as the diode and BJT ,DroidTesla engine searching for the approximate solution by making an initial guess at an answer
and then improving the solution with successive calculations built upon this guess.

• Platform: Android 2.x, Android 3.x, Android 4.4, Android 4.x

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