archive-com.com » COM » S » SEQUOIASCI.COM

Total: 241

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • tt2mat.m | Sequoia Scientific
    article contains the code for the tt2mat m Matlab script used for reading the binary dat files from LISST 100 LISST 100X LISST Portable and LISST Infinite To use copy all lines between the into your Matlab editor and save with the filename tt2mat m tt2mat file for Matlab use Usage data tt2mat filename nvariables Produces a variable i e rows x nvaribles in size from a binary dat file For LISST 100 and LISST 100X nvariables should be 40 For LISST Portable and LISST Infinite nvariables should be 80 Modified 7 13 98 removed end statement at end of function Comments added April 15 2008 by OAM Version 1 5 function data tt2mat filename nvariables fid fopen filename open file d fread fid uint8 read the binary data into d vector fclose fid close file d d 1 2 length d 256 d 2 2 length d binary data converted into digital counts rows floor length d nvariables figure out the number of rows we will have d d 1 rows nvariables re size d so it is of length rows nvariables dm reshape d nvariables rows get an nvariables rows matrix from d data dm transpose it to get an rows nvariables 40 or 80 columns matrix Problems Email us More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a Quote Terms Of Sale Support FAQ Downloads Warranty Info Installation Requirements Responsibilities

    Original URL path: http://www.sequoiasci.com/article/tt2mat-m/ (2016-02-13)
    Open archived version from archive


  • Matlab processing of LISST-ST data | Sequoia Scientific
    settling time Ts This uses the function findsv m Saving the median sizes and corresponding settling velocity Processing the next settling experiment In the example on the back the datafile name needs to be defined as also the names of the background file and the ring area file The following functions and files must be in your path we recommend placing these in your work folder within MATLAB tt2mat m reads a binary datafile nlia dll inverts corrected scattering to get size distribution lowresc m inversion of scattering findsv m computes settling velocity m8x8v b mat matrix for type B instrument m8x8v c mat matrix for type C instrument t samp asc sampling times ascii file As the processing proceeds 4 graphs are displayed for each settling experiment The first is the history of optical transmission This graph should indicate a continuous increase in optical transmission ending near 1 If the transmission record does not reach near unity the experiment probably did not go long enough The second graph is the history of corrected scattering itself Here you will see the rapid decline of scattering at inner rings with time but a slower decline at the outer rings of the detector The third graph has 8 subplots Each subplot shows the history of a size class beginning with the smallest size at top left going across to the right and then below On each history a fitted idealized form is shown that was used to find the settling time Often when large particles are absent or in very small numbers the history of concentration for these will be noisy Use this information to accept or discard the estimate Finally a log plot of settling velocity is displayed against diameter of particles A typical run is shown below we show number of time steps reduced from default 83 to 72 in the example text following the sign are explanatory comments filename pacific dat n tsteps 72 number of time steps in the settling experiment iheader 40 bytes in header 12 or 80 use 6 or 40 here see TTB program stdata tt2mat filename iheader 40 n tsteps load the data file r c size stdata get size of datafile nexpt r number of settling experiments performed load X1044zsca asc load zscat file zsc X1044zsca convenience just rename the variable to zsc or if a binary file use zsc mean tt2mat x2403zs dat 40 r c size zsc if r 1 c 40 zsc zsc end r zsc 33 zsc 36 ratio of clean water laser power to laser reference dcal load ringarea asc load ringarea file load t samp asc file containing sampling times process data one settling experiment at a time for i expt 1 nexpt d stdata i expt header d 1 iheader d 1 iheader d reshape d 40 n tsteps convert data to proper format n tsteps x 40 r1 c size d tau d 33 r d 36 semilogx t samp 1 n tsteps 100 tau

    Original URL path: http://www.sequoiasci.com/article/matlab-processing-of-lisst-st-data/ (2016-02-13)
    Open archived version from archive

  • DeepWater Horizon Oil Spill in the Gulf of Mexico | Sequoia Scientific
    the peer reviewed literature using the LISST 100X for this purpose includes Lewis A Trudel BK Belore RC Mullin JV 2010 Large scale dispersant leaching and effectiveness experiments with oils on calm water Marine Pollution Bulletin 60 244 254 doi 10 1016 j marpolbul 2009 09 019 Belore RC Trudel K Mullin JV Guarino A 2009 Large scale cold water dispersant effectiveness experiments with Alaskan crude oils and Corexit 9500 and 9527 dispersants Marine Pollution Bulletin 58 118 128 doi 10 1016 j marpolbul 2008 08 013 Li Z Lee K Kepkay P KingT Yeung W Boufadel MC Venosa AD 2008 Wave Tank Studies on Chemical Dispersant Effectiveness Dispersed Oil Droplet Size Distribution In Davidson WF Lee K Cogswell A Eds Oil Spill Response A Global Perspective NATO Science for Peace and Security Series C Environmental Security Springer pp 143 157 doi 10 1007 978 1 4020 8565 9 Li ZK Kepkay P Lee K KingT Boufadel MC Venosa AD 2007 Effects of chemical dispersants and mineral fines on crude oil dispersion in a wavetank under breaking waves Marine Pollution Bulletin 54 983 993 doi 10 1016 j marpolbul 2007 02 012 Sterling MC Bonner JS Ernest ANS Page CA Autenrieth RL 2004 Characterizing aquatic sediment oilaggregates using in situ instruments Marine Pollution Bulletin 48 533 542 doi 10 1016 j marpolbul 2003 10 005 Sterling MC Jr Bonner JS Ernest ANS Page CA Autenrieth RL 2004 Chemical dispersant effectiveness testing influence of droplet coalescence MarinePollution Bulletin 48 969 977 doi 10 1016 j marpolbul 2003 12 003 For more information about the LISST 100X email Sales Marketing Manager Dr Ole Mikkelsen More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments

    Original URL path: http://www.sequoiasci.com/article/deepwater-horizon-oil-spill-in-the-gulf-of-mexico/ (2016-02-13)
    Open archived version from archive

  • How is ppm related to concentration | Sequoia Scientific
    The amount of particles in a suspension can be expressed as the total volume OR total mass of particles in a unit volume of water AND THESE TWO NUMBERS WILL ONLY BE THE SAME IF THE DENSITY OF THE PARTICLES IS 1 g cm3 If ppm is expressed as THE VOLUME of particles to a unit volume of water then ppm BY VOLUME is equal to µl l However if ppm is expressed as THE MASS of particles in a unit volume of water then ppm BY MASS is equal to mg l To convert from ppm by volume to ppm by mass multiply by the density of the particles For mineral grains clay silt and sand sizes this will typically be 2 65 g cm3 For example a sample with a volume concentration of 25 µl l will have a mass concentration of 25 2 65 66 mg l To convert from ppm by mass to ppm by volume divide by the density of the particles For example a sample with a mass concentration of 100 mg l will have a volume concentration of 38 µl l When ppm is used as a measure for the suspended particle concentration it is therefore very important to specify if the concentrations are ppm BY VOLUME or ppm BY MASS to facilitate comparisons with data where the concentrations are reported in µl l or mg l Questions to this article Email us More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments

    Original URL path: http://www.sequoiasci.com/article/how-is-ppm-related-to-concentration/ (2016-02-13)
    Open archived version from archive

  • OpenConnection Error | Sequoia Scientific
    Sequoia March 29 2010 Q When I try to connect to my LISST 100 or LISST 100X I get the following error messages from the SOP OpenConnection Error 7 Initializing port 0 and or OpenCommDev OpenConnection Failed and or Unable to open communication port What is wrong A This is because the communication port that the SOP is trying to access is either not available or is being used by another piece of equipment or 2 versions of the SOP are running at the same time and one version has already accessed the port thereby preventing the session you are using to access the port or because MOTOCROSS is open at the same time as the SOP and had accessed the port Check the SOP settings in File Settings Serial Port and make sure that the serial port selected in this case port 3 is available for selection in the device manager Please note that the device manager can be accessed in Windows through Start Control Panel System Hardware Device Manager Also don t forget to make sure that no other versions of the SOP is running that no other instrument is connected to the port you are trying to use and that MOTOCROSS is not using the same port that the SOP is trying to use Questions to this troubleshooting note Email us More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a

    Original URL path: http://www.sequoiasci.com/article/openconnection-error/ (2016-02-13)
    Open archived version from archive

  • I Cannot Connect to my LISST-100X | Sequoia Scientific
    this problem also exists for computers from other manufacturers If possible connect directly to an actual serial port i e do not use a USB Serial adapter unless absolutely necessary and check if this makes a difference Close the LISST SOP and open up the MOTOCROSS program This program is located in the LISST100 directory on your computer motocross exe Be sure that the selected communication port is correct and that its settings are correct Now check the connectivity of the communication cable You will need 2 paperclips and a voltmeter You also need to consult the connector diagram for the 5 pin connector both the male bulkhead connector and the cable end see below Make sure that the cable is connected to the serial port of the PC and proceed as follows Check the voltage between pins 1 and 2 on the communication cable You may need the paperclips to extend the measuring pins of the voltmeter to make a proper contact inside the cable The voltage should read 12 V If it does not the cable may be defect Short the female pins 4 and 5 on the communication cable using one or both paperclips Type some characters into MOTOCROSS They should appear on the screen If they do not the cable may be defect Measure the voltage between pins 3 and 4 of the male bulkhead 5 pin connector on the LISST 100X The voltage will be 0 most of the time and should spike to between 5 to 9V every 2 minutes for about 2 seconds It can be challenging to maintain contact for 2 minutes so take care to ensure constant contact and then watch the voltmeter continuously LISST 100X Communications and power connector 5 pin connector endviews Remove the end cap and disconnect the

    Original URL path: http://www.sequoiasci.com/article/i-cannot-connect-to-my-lisst-100x/ (2016-02-13)
    Open archived version from archive

  • No Valid Query Response | Sequoia Scientific
    Home Library Articles No Valid Query Response No Valid Query Response Troubleshooting LISST 100X No Valid Query Response Sequoia January 13 2010 Q When I try to query the instrument I get this error A In addition to checking the cable power and serial port settings make sure that the instrument is not running Open up the terminal window and confirm that no program is running If a program is running stop it by clikcing the stop button close the terminal window and try to query the instrument again Comments or questions to this troubleshooting note Email us More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a Quote Terms Of Sale Support FAQ Downloads Warranty Info Installation Requirements Responsibilities Warranty Register a Product Returns Contact Support Library Articles Technical Papers Standards About Staff

    Original URL path: http://www.sequoiasci.com/article/no-valid-query-response/ (2016-02-13)
    Open archived version from archive

  • Could Not Find [Instrumentxxxx] section in LISST.ini | Sequoia Scientific
    depending on the serial number of your instrument A Go to your C WINDOWS folder and search for the LISST INI file Open it up in Notepad or a similar text editor Make sure that the section containing your instrument calibration constants are located in the file It not copy them from the LISST INI file that was included on the ship disk for your instrument Then re save the edited LISST INI file in C WINDOWS A typical LISST INI file for LISST 100X looks something like this it is the bold section you need to copy to the INI file in C WINDOWS Directories CalFiles C Program FilesSequoiaLISST100 PDFirst 1 Program A Lisst1069 ttb DatFiles S LISST 100XProductionProduction DataUnit1140 Miscellaneous ShowMean 0 ShowStdDev 0 Header Laser In Situ Scattering and Transmissometry LISST Footer Sequoia Scientific Inc Communications PortIndex 0 BaudIndex 0 InstrumentOutput AsciiPsd 0 AsciiRaw 0 BinPsd 1 BinRaw 0 RawFileOutput AsciiPsd 0 AsciiRaw 0 BinPsd 1 Instrument1004 HK0Label Laser Power HK0Units mW HK0Scale 0 00063869 HK0Off 0 HK1Label Battery HK1Units Volts HK1Scale 0 01 HK1Off 0 0 HK2Label External Instrument HK2Units Volts HK2Scale 0 0012 HK2Off 0 05 HK3Label Laser Reference HK3Units mW HK3Scale 0 000900 HK3Off 0 HK4Label Depth HK4Units meters HK4Scale 0 01 HK4Off 10 HK5Label Temperature HK5Units Deg C HK5Scale 0 01 HK5Off 0 HK6Label Day 100 Hour HK6Units HK6Scale 1 HK6Off 0 HK7Label Minute 100 Seconds HK7Units HK7Scale 1 HK7Off 0 Questions about this trobuleshooting note Email us More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST

    Original URL path: http://www.sequoiasci.com/article/could-not-find-instrumentxxxx-section-in-lisst-ini/ (2016-02-13)
    Open archived version from archive



  •