| __Name__ | __Size__ | __Date__ | __Rating__ | __Description__ |

| **(Parent Dir)** | *folder* | | **Up to TI-Nspire Basic Files** |

| **darcyweisbach.zip** | 519k | 19-07-06 | | **Darcy-Weisbach Application** This application contains 3 programs for use in the Darcy-Weisbach Equation. The programs can calculate the DW friction factor, headloss, Reynold's number and viscosity of water. This has wide application in pipe hydraulics. An example and readme is included for usage. |

| **openchannel.zip** | 265k | 19-07-04 | | **Open Channel Hydraulics** This program calculates open channel section properties and stores them as variables. These are useful in flow calculations and in conjunction with the Manning's equation to solve for unknown hydraulic variables. Readme included with examples. Updated to version 2 (added additional channel section types and Z section calculations.) |

| **scs.zip** | 145k | 19-06-07 | | **SCS Runoff (TR-55) Program** This program will determine the runoff in a basin of interest based on the USDA/NCRS TR-55 methodology. A readme is included. |

| **timeofconcentration.zip** | 234k | 19-06-07 | | **Time of Concentration (TR-55) Program** This program calculates the time of concentration for different flow segments as laid out in USDA/NCRS TR-55. They are calculated separately and as the user deems applicable. A readme is included. |

| **mannings.zip** | 157k | 19-04-30 | | **Manning's Equation Solver** This function solves the Manning's Equation for unknown variables. This is for open channel flow calculations and finding unknown variables from the equation. Best used in conjunction with my Open Channel Hydraulics program. Readme is included with examples. |

| **threedtruss.zip** | 194k | 19-01-05 | | **Truss - 2-D and 3-D v1.01** The program finds the longitudinal and reaction forces in a 2-dimensional- or 3-dimensional truss by means of solving the matrix of equations of equilibrium at the nodes for the entire system. |

| **planetsvariable.zip** | 25k | 18-02-06 | | **Planets ( Variable Orbital Elements ) - v 3.05** Given the local date, time and location of observer the program finds by means of the orbital elements stored on page 1.7 the equatorial and horizon coordinates as well as distance from Earth, Sun, phase and brightness for all planets simultaneously. The positions of the planets are depicted in graphs on page 1.3 ( above horizon ), 1.4 ( below horizon ) and 1.5 ( positions referred to the Sun in the centre of the orbital plane ). |

| **sunriseset.zip** | 6k | 18-01-31 | | **Sunrise, Sunset & Azimuth - v3.02** The program finds for a given date, timezone including daylight saving and location the times of sunrise, sunset, twilight and the azimuths of rise and set. Accuracy lies within +- 3 min. |

| **motion3d_cas.zip** | 30k | 18-01-10 | | **Two- or Three Dimensional Motion - v1.1 ** The program analyzes 2- or 3 dimensional motion of a body or projectile. For the case of 3-dimensional motion it solves for up to six unknown quantities. Inputs are any numerical values of acceleration, which may be either constant or time dependent and the names or numerical values of the remaining motion quantities and initial conditions. Those variables which are input by their names are solved for. |

| **foundation.zip** | 660k | 17-09-18 | | **Foundation with Failing Tension Zone v1.03** The program computes for a rectangular foundation submitted to vertical loads N and moments My and Mz the soil pressure for all points of the contour in consideration of a gaping zone ( no tension possible in the gap ). The automatic consideration of the own weight is provided. |

| **mohrcircle_cx.zip** | 12k | 17-07-27 | | **Mohr's Circle v2.00** Given the normal stresses Sx, Sy and the shear stress Txy the program finds for the state of plane stress the principal stresses S1, S2 and the incidental angle phi1 and vice versa. Besides Mohr's circle is drawn for the current calculation. |

| **eurocode_2.zip** | 316k | 17-05-02 | | **Beam Design based on EUROCODE 2 ( Regbem_EC2 v2.5 )** The program determines for a rectangular concrete beam characterized by its dimensions b and h, concrete quality C.., and loads M and/or N for a chosen ratio As2/As1 ( 0<=As2/As1<=1 ) the required reinforcements both on top ( As2, pressure ) and at the bottom ( As1, tension ) and summarizes the result in a graph (page 1.2 of the document ). The design is based on EUROCODE 2 and the National Annex for Germany. |

| **polygon.zip** | 360k | 17-04-11 | | **Cross-Section Properties v2.0** The program determines for any cross-section polygon with gaps of circle areas the main section properties and computes for any load combination of N, My, Mz the stresses in all input points. Furthermore a plot of the contour including main axis and neutral axis,where Sigma=0, is provided. |

| **utm_to_dach.zip** | 292k | 16-06-24 | | **Conversion UTM to D / A / CH-Coordinates v2.02** The program converts geodetic coordinates given in the WGS84-system into the corresponding values of the national systems "POTSDAM" (Gauss-KrÃ¼ger, Germany), "MGI" (BMN, Austria), "LV95" (Switzerland) and vice versa. Graphs of the location of the entered point in the German Messtischblatt (MTB) as well as the margin coordinates of the MTB's section are included (Language: GERMAN). - Das Programm wandelt geodÃ¤tische Koordinaten im Bezugssystem WGS84 in die entsprechenden Werte der Bezugssysteme POTSDAM (D), MGI (Bundesmeldenetz BMN, A) und LV95 (CH) und umgekehrt um. Eine grafische Darstellung der Lage des eingegebenen Punktes im zugehÃ¶rigen Deutschen Messtischblatt (Topografische Karte 1:25000) mit 1/64-Unterquadranten wie auch der begrenzenden Koordinaten des jeweiligen Unterquadranten ist vorhanden. Bei Lage des Punktes auÃerhalb des MTB-Bereichs fÃ¼r D, A, CH wird eine Warnung ausgegeben. |

| **moondecl.zip** | 6k | 16-04-30 | | **Maximum Declinations of the Moon v1.00** Given a date as yyyy.mmdd the program finds the nearest dates and times ( Dynamical Time TD ) of the maximum northern and southern declinations of the Moon and the values of these extreme declinations. |

| **equinox.zip** | 5k | 16-04-18 | | **Equinoxes and Solstices v1.00** The program finds for any year between -1000 and +3000 the dates and times (displayed as Dynamical Time TD) of equinoxes and solstices. |

| **moonsun.zip** | 15k | 16-04-04 | | **Positions of Sun and Moon v3.00** Given the date, local time and position of the observer the program finds for both the Sun and the Moon the apparent diameter, the equatorial as well as the horizon coordinates, additionally for the Moon the distance to Earth, phase including indication of waxing/waning Moon, position-angle of the bright limb, solar elongation and the occurence of a lunar / solar eclipse. The position of both objects is depicted in a graph (page 1.3: above, page 1.4: below horizon ). |

| **eclipses.zip** | 8k | 16-03-06 | | **Phases of the Moon & Eclipses v1.01** Given a date as yyyy.mmdd the program finds the nearest dates of New Moon and Full Moon and checks for the occurence of a solar or lunar eclipse. If existing, data of the eclipse(s) are displayed. Description on page 1.1 . |

| **orbit.zip** | 55k | 16-02-01 | | **Orbital trajectory simulator** This program gives you orbital information, along with trajectory draw-out. Enter state vectors (start position, velocity vectors, etc.) and watch it calculate the path along with other information onto graph screens. contact me if you have any feedback, greatly appreciated. Documentation included in program -Evan |

| **elasticitycas.zip** | 20k | 15-10-14 | | **Econ Elasticity** Easy wast to get Elasticity |

| **transporte.zip** | 3k | 15-09-25 | | **transporte** It contains some programs for transport engineering. |

| **suelos.zip** | 4k | 15-09-25 | | **suelos** This file contains programs for soil mechanics. |

| **oscillation.zip** | 14k | 15-04-20 | | **Oscillation v2.0** The program provides a solution to the differential equation of 2nd order describing the oscillation of a damped/undamped system submitted to a force F = f(f0,sin,cos) or unforced. Results are the general as well as the particular solution meeting any initial conditions x(t0)=x0, x'(t0)=x1. A graph on page 1.3 depicts the results of the recent calculation. V2.0: the constants of integration now are eliminated automatically by the program. |

| **tpn_cas.zip** | 18k | 15-01-26 | | **Two port network solver for Nspire cx cas** This program include : solve two port network 1)convert par. 2)circuit performance 3)connect two par.(serise-parallel-cascade) |

| **dewpointandhumidity.zip** | 7k | 14-12-06 | | **Dew Point and Relative Humidity v1.3** The program calculates the unknown quantity, if two of the following values are given: air temperature Te [°C], relative humidity phi [%], dew point temperature Ts [°C]. Besides, the saturation amount at temperature Te, vapor pressure, specific gravity of air depending on Te and air pressure and the precipitation of water for a reduced temperature Te < Ts is computed. Program covers the range of -20°C<=Te<=30°C. |

| **chemistryformulas.zip** | 121k | 14-10-18 | | **Chemistry I & II Equations Library** This library contains just about every mathematical equation used over Chemistry I and Chemistry II. Additionally, I also put in some equations I derived as shortcuts, like stoichiometric relationships solved for 1. Be aware that representation of some variables may be different due to nSpire limitations (e.g. concentrations like [X] will be rendered as X_c). Programs like mass("CH3COOH") were included from previous author Nelson Sousa's work. If you wanted to, you could copy and paste the periodic table app by Nick Steen in here, too: http://www.ticalc.org/archives/files/fileinfo/444/44465.html |

| **physicsunitsandconstantsm.zip** | 79k | 14-10-18 | | **Physics Formulas and Workspace 2.0** This package for the nSpire CAS includes every formula that comes up in Calculus-Based Physics I and II. |

| **t_section.zip** | 12k | 14-10-01 | | **Assembled Partial Sections v2.0** The program finds for a uni-symmetrical section assembled out of n rectangles and/or profiles the total section properties as area, center of gravity, area moment of 1st order, moment of inertia and moduli of resistance. After that part of calculation the determination of axial and shear stresses for a given combination of axial force N, shear force Vz and bending moment My may directly follow. |

| **decimyeartoymd.zip** | 3k | 14-08-13 | | **Conversion of Years** The program converts the decimal format of a year ( as often quoted in astronomical almanacs ) into the year/month/day/hour/min/sec - format and vice versa. |

| **planetfinder.zip** | 17k | 14-04-06 | | **Position of Planets v2.0** Given the local date, time, time zone, location of the observer and orbital elements ( listed on page 1.5 ) the program finds the right ascension, declination, azimuth, altitude, distance from Earth, apparent angular diameter and apparent brightness of the major planets Mercury to Neptune. Afterwards the position referred to the horizon coordinates is depicted in a graph ( page 1.3 above, page 1.4 below horizon ). V2.0 now includes corrections for horizontal parallax. |

| **beamdiagram.zip** | 94k | 14-04-06 | | **Beam Shear-Moment Diagram** This program is very useful for students in statics and mechanics of solids. It draws shear and moment diagrams for beams under various loads, forces, and moments. It also gives shear and moment piecewise functions with evaluations at the upper and lower bounds of the functions. Please read the attached document before using. *Update 1: Now able to reattempt section entries. *Update 2: Now evaluates maximum values and cleans up variables after running. |

| **parcomets.zip** | 13k | 14-03-27 | | **Comets on Parabolic Orbits v1.0** Given the calendar date, local time and time zone including daylight saving the program finds for comets with parabolic motion the orbital data of which are known ( stored on page 1.5 ) the right ascension, declination, azimuth, altitude and distance from Earth. The orbital data may edited, changed or completed. A graph of the comet's position is provided on pages 1.3 or 1.4. |

| **ellcomets.zip** | 16k | 14-03-27 | | **Periodic Comets v2.0** Given the calendar date, local time and time zone including daylight saving the program finds for comets the orbital data of which are known, the right ascension, declination, azimuth, altitude and distance from Earth. The orbital data may be edited, changed or completed. V2.0: a graph of the position is provided on pages 1.3 or 1.4. |

| **astrocoord.zip** | 9k | 14-03-23 | | **Astronomical Coordinate Conversion v1.0** The program converts any position of an astronomical object given in one system into the equivalent coordinates of another system. Provided are equatorial ( right ascension as well as hour angle ), ecliptic, horizon, and galactic system. |

| **binarystars.zip** | 13k | 14-02-15 | | **Binary Stars v1.0** Given any date, local time and time zone including daylight saving the program finds for binary star systems, the orbital elements of which are known, the position angle of the companion B referred to primary object A ( assumed to be fixed ) and the separation in arcsec. The data of twenty systems are already stored on page 1.3 of the file. Documentation on page 1.1 including an illustrating figure on page 1.4 . |

| **twilight.zip** | 5k | 14-01-30 | | **Morning & Evening Twilight** This program serves as completion of program "Sunrise & Sunset" in the same TI-nspire section. It calculates for a given date, timezone and location the morning and evening twilight ( civil, nautical and astronomical ). |

| **catenarydist.zip** | 7k | 13-10-26 | | **Catenary - Cable Subject to a Distributed Load** This program calculates the forces, cable length and/or the maximum sag of a cable or rope that is fixed in two points A (xa,ya) and B (xb,yb) and is subject to a uniformly distributed load q. The supports may be on the same horizontal level ( ya=yb=0 ) or may have different heights ( ya=0, yb<0 or yb>0 ). The results depend on the inputs you have carried out. |

| **catenary.zip** | 9k | 13-10-26 | | **Catenary - Cable Subject to its Dead Load** This program determines for a cable or rope being subject to its dead load q the internal force F,res, its horizontal and vertical components ( F,hor , F,vert ) as well as the sag of the cable. The supports may be on the same horizontal level ( ya=yb=0 ) or may have different heights ( ya=0, yb<0 or yb>0 ). A graph of the function is provided on page 1.3 . |

| **twostoreycolumn.zip** | 6k | 13-10-07 | | **Buckling of a Two-Storey Column** For a two-storey column with different cross-sections and kinds of support the program determines the buckling factors and effective (buckling) lengths of both sections. |

| **mtb_lb.zip** | 13k | 13-09-03 | | **MTB-to-Lon&Lat v3.01** Being given the number of any German Messtischblatt with/without subquadrants the program calculates the degrees of latitude and longitude marking the boundaries of the detail and the coordinates of the section corners (Language: German). - Das Programm berechnet aus der Nummer des Deutschen Messtischblattes (Topografische Karte 1:25000) mit/ohne Angabe von 1/4-, 1/16- oder 1/64-Unterquadranten die begrenzenden Längen- und Breitengrade (Kartendatum: POTSDAM), die Eckkoordinaten des Ausschnitts als Gauss-Krüger-Werte und (ab v3.0) zusätzlich als UTM-Koordinaten (System: WGS 84). Dokumentation auf Seite 1.1 des Programms. |

| **spring_const.zip** | 18k | 13-05-19 | | **Spring Constants Equivalent to Rigidity of Beam** This program calculates for a one-field beam with modulus of elasticity E and moment of inertia I the equivalent spring constants ( vertical spring c,v and rotational spring c,phi ) at any point of the beam's length L. Different kinds of support conditions are provided. |

| **singlespan.zip** | 246k | 13-05-13 | | **Single-Span Beam (Support Reactions and Moments) v1.2** The program calculates for a single-span beam with any number of sections you like and elastic restraints or external moments at the supports the support reactions, end moments and maximum field moment including its location. Each section may have a trapezoidal load and a point load at the right end. Furthermore the shear force and the internal moment for any point of the beam can be calculated. |

| **tripod.zip** | 4k | 13-04-12 | | **Beam Forces in a Tripod** This is a little program that calculates the beam- and reaction forces of a tripod having the base points A, B, and C and a common end point T, which is loaded by a force F (Fx, Fy, Fz). |

| **vecop.zip** | 8k | 12-10-05 | | **Vector Operations v1.3.2** Provides functionality to resolve vectors into components and add multiple vectors. Also includes a projectile program to display various data on the flight path of a projectile given some initial sets of data. |

| **field_3.zip** | 187k | 12-08-10 | | **Internal Forces of a Continuous Beam** The program determines for a two- or three-span beam with different moments of inertia the extreme support moments, field moments with their current location, shear- and reaction forces. Accepted are for each field one uniformly distributed and one trapezoidal load. |

| **gk_to_mtb_conv.zip** | 63k | 12-06-11 | | **GAUSS_KRUEGER_to_MTB_v1.2** This program converts geodetic coordinates to GAUSS-KRUEGER(GK)-coordinates and vice versa on the base of POTSDAM date and shows the number of the corresponding "Messtischblatt" (MTB) with quadrants and sub-quadrants. Small bug fixed in v1.2 - Das Programm wandelt geodaetische Koordinaten in Gauss-Krueger-Werte und umgekehrt um und zeigt die Nummer des zugehoerigen Messtischblattes mit Unterquadranten an. V1.2: kleiner Fehler bei der Zuordnung zu MTB beseitigt. |

| **buckling_ec2.zip** | 200k | 12-06-03 | | **Buckling Length of a Concrete Column v1.1** The program computes for a concrete column connected to beams and neighbouring columns the factors of elastic restraints at both ends and resulting from these values the effective length based on EUROCODE 2 and the National Annex for Germany. V1.1 now provides the input of circular cross-sections. |

| **starfind.zip** | 49k | 12-05-23 | | **Starfinder v2.0** Given the date, time, timezone, your location and the coordinates of a stellar object, this program calculates the azimuth and the elevation above horizon and shows the result in a simple plot. |

| **energyproblemsolver.zip** | 18k | 12-05-11 | | **Energy Problem Solver** A simple set of energy conservation programs for high school physics, written in ti-nspire cx basic, that will solve for kinetic energy, potential energy, mass, velocity, initial velocity, height, distance, and final velocity. |

| **utmconv.zip** | 44k | 12-04-29 | | **utm_convert** This program converts geodetic coordinates given as latitude and longitude to UTM coordinates and vice versa on the basis of WGS84. |

| **circulomohr.tns.zip** | 8k | 12-01-02 | | **Mohrs Circle** The program will prompt the user for the x and y axial stress and shear stress. The program will calculate the maximum shear stress, and principal stresses. Mohr's circle will then be drawn. |

| **circulodemohr.tns.zip** | 5k | 11-12-28 | | **Mohrs Circle** The program will prompt the user for the x and y axial stress and shear stress. The program will calculate the maximum shear stress, and principal stresses. Mohr's circle will then be drawn. |

| **mom.zip** | 3k | 10-10-21 | | **Mechanics of Materials** Includes my previous Mohr's Circle program and a 3D stress program. The 3D stress will yield a the three stress invariants, the three principle stress, and the max shear stress for a defined state of stress. The user inputs the normal x, y, and z stresses followed by the xy, xz, and yz shears. (I'm hopping to include the direction cosines and the ability to do coordinate rotations in a future version. If people want those added, rate this program and leave a comment so I know that it would be useful to people.) |

| **vectors.zip** | 4k | 10-01-14 | | **Vector Sum** Adds vectors and displays the resultant magnitude and direction. Displays the sum graphically with the parallelogram method, the tip-to-tail method and in a free body diagram. |

| **molecules_en.zip** | 113k | 09-03-31 | | **Molecules 3D** A 3D viewer of molecule structures. Includes several inorganic and organic molecules. Molecules can be rotated in space or animated. More info in www.nelsonsousa.pt |

| **units.zip** | 21k | 09-03-18 | | **Unit Converter** A library to add unit conversion functionality to numeric TI-Nspire (TI-Nspire CAS allready has it). Features all units and constants available on TI-Nspire CAS. |

| **chemistry.zip** | 27k | 09-03-13 | | **Chemistry Library** Balance chemical reactions and compute masses of compounds. Examples: mass("H2SO4"), balance("H2+O2=H2O"). Formula syntax supports standard organic chemistry notation (like CH3COOH or CH3CH2CH2CH3) and parenthesis (like K4Fe(CN)6). Also includes functions to determine names, symbols and atomic numbers of elements. |

| **periodic.zip** | 69k | 09-02-25 | | **Periodic Table** Full Periodic Table on TI-Nspire with graphical interface. Data is presented in a spreadsheet. Includes plot of atomic properties and functions to determin an element's name, symbol and mass. |