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Weight loss from a TG curve

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T O P I C R E V I E W
mohamed1986	Posted - 05/02/2014 : 1:51:24 PM Origin Ver. and Service Release (Select Help-->About Origin): Operating System: Hello friends, Kindly I have a TG curve, and I want to calculate the weight loss of each step and the residual weight as the attached image in the green curve. Here an example of a TG data if you need it. I have origin 9.1 22.6885 100.0000 25.2577 99.8128 27.8269 99.6183 30.3961 99.4171 32.9653 99.2106 35.5346 99.0008 38.1038 98.7906 40.6730 98.5829 43.2422 98.3805 45.8114 98.1862 48.3806 98.0018 50.9498 97.8287 53.5190 97.6674 56.0882 97.5175 58.6574 97.3783 61.2266 97.2484 63.7958 97.1265 66.3651 97.0110 68.9343 96.9006 71.5035 96.7941 74.0727 96.6904 76.6419 96.5888 79.2111 96.4887 81.7803 96.3898 84.3495 96.2915 86.9187 96.1938 89.4879 96.0965 92.0571 95.9994 94.6264 95.9024 97.1956 95.8055 99.7648 95.7087 102.3340 95.6118 104.9032 95.5148 107.4724 95.4177 110.0416 95.3203 112.6108 95.2226 115.1800 95.1246 117.7492 95.0262 120.3184 94.9273 122.8877 94.8280 125.4569 94.7281 128.0261 94.6277 130.5953 94.5267 133.1645 94.4250 135.7337 94.3226 138.3029 94.2196 140.8721 94.1157 143.4413 94.0110 146.0105 93.9055 148.5797 93.7992 151.1490 93.6921 153.7182 93.5840 156.2874 93.4751 158.8566 93.3651 161.4258 93.2541 163.9950 93.1423 166.5642 93.0294 169.1334 92.9155 171.7026 92.8005 174.2718 92.6846 176.8410 92.5675 179.4103 92.4494 181.9795 92.3301 184.5487 92.2097 187.1179 92.0881 189.6871 91.9654 192.2563 91.8412 194.8255 91.7155 197.3947 91.5876 199.9639 91.4568 202.5331 91.3219 205.1023 91.1807 207.6716 91.0298 210.2408 90.8644 212.8100 90.6775 215.3792 90.4597 217.9484 90.1990 220.5176 89.8813 223.0868 89.4902 225.6560 89.0095 228.2252 88.4239 230.7944 87.7217 233.3636 86.8972 235.9329 85.9526 238.5021 84.8991 241.0713 83.7572 243.6405 82.5553 246.2097 81.3275 248.7789 80.1090 251.3481 78.9332 253.9173 77.8266 256.4865 76.8060 259.0557 75.8763 261.6249 75.0296 264.1941 74.2459 266.7634 73.4944 269.3326 72.7371 271.9018 71.9321 274.4710 71.0376 277.0402 70.0171 279.6094 68.8433 282.1786 67.5020 284.7478 65.9949 287.3170 64.3403 289.8862 62.5727 292.4555 60.7391 295.0247 58.8944 297.5939 57.0951 300.1631 55.3936 302.7323 53.8331 305.3015 52.4432 307.8707 51.2394 310.4399 50.2228 313.0091 49.3828 315.5783 48.7001 318.1475 48.1504 320.7168 47.7080 323.2860 47.3483 325.8552 47.0494 328.4244 46.7934 330.9936 46.5664 333.5628 46.3580 336.1320 46.1611 338.7012 45.9709 341.2704 45.7844 343.8396 45.5994 346.4088 45.4150 348.9781 45.2306 351.5473 45.0460 354.1165 44.8608 356.6857 44.6750 359.2549 44.4886 361.8241 44.3016 364.3933 44.1138 366.9625 43.9254 369.5317 43.7364 372.1009 43.5468 374.6701 43.3566 377.2394 43.1657 379.8086 42.9742 382.3778 42.7822 384.9470 42.5896 387.5162 42.3963 390.0854 42.2025 392.6546 42.0080 395.2238 41.8129 397.7930 41.6172 400.3622 41.4210 402.9314 41.2243 405.5007 41.0269 408.0699 40.8289 410.6391 40.6303 413.2083 40.4312 415.7775 40.2316 418.3467 40.0313 420.9159 39.8304 423.4851 39.6289 426.0543 39.4269 428.6235 39.2243 431.1927 39.0211 433.7619 38.8173 436.3312 38.6129 438.9004 38.4079 441.4696 38.2023 444.0388 37.9961 446.6080 37.7893 449.1772 37.5818 451.7464 37.3737 454.3156 37.1649 456.8848 36.9556 459.4540 36.7456 462.0232 36.5349 464.5925 36.3235 467.1617 36.1115 469.7309 35.8989 472.3001 35.6855 474.8693 35.4714 477.4385 35.2566 480.0077 35.0410 482.5769 34.8248 485.1461 34.6078 487.7153 34.3900 490.2845 34.1716 492.8538 33.9523 495.4230 33.7322 497.9922 33.5114 500.5614 33.2897 503.1306 33.0672 505.6998 32.8440 508.2690 32.6198 510.8382 32.3947 513.4074 32.1687 515.9766 31.9418 518.5458 31.7140 521.1151 31.4852 523.6843 31.2556 526.2535 31.0250 528.8227 30.7935 531.3919 30.5609 533.9611 30.3274 536.5303 30.0928 539.0995 29.8571 541.6687 29.6205 544.2379 29.3828 546.8071 29.1440 549.3764 28.9040 551.9456 28.6629 554.5148 28.4207 557.0840 28.1773 559.6532 27.9328 562.2224 27.6870 564.7916 27.4400 567.3608 27.1918 569.9300 26.9423 572.4992 26.6916 575.0684 26.4396 577.6377 26.1864 580.2069 25.9317 582.7761 25.6757 585.3453 25.4185 587.9145 25.1598 590.4837 24.8998 593.0529 24.6383 595.6221 24.3755 598.1913 24.1113 600.7605 23.8455
3 L A T E S T R E P L I E S (Newest First)
lkb0221	Posted - 05/02/2014 : 3:11:16 PM the weight loss of the 1st step is the difference between the first point in your data and xi1, right? And the last weight loss is between xi2 and the last point. Besides, PWL3 only separate the curve into 3 segments. So if you have more than 3 steps in your curve, either do partial fit step by step, or build a user-defined fitting curve just like PWL3 but with higher order.
mohamed1986	Posted - 05/02/2014 : 2:29:04 PM Thanks much for your kind help. I have performed all the steps with the attached example but it gave me only one step or weight loss although it has 3 steps. Thanks
lkb0221	Posted - 05/02/2014 : 2:01:53 PM Hi, You can NLFit the curve by function Piecewise:PWL3 to find the slope changing points (xi1 & xi2). Then throught find Y by X to get corresponding Y values. The weight loss is the difference between the Y values. All the above can be implemented by building a analysis template. Zheng OriginLab

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