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تحلیل چند متغیره تلفات دانه و انرژی در سیستمهای برداشت گندم با رویکرد ترکیبی PCA-LDA | ||
| نشریه مکانیزاسیون کشاورزی | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 06 آبان 1405 اصل مقاله (993.09 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/jam.2026.69550.1343 | ||
| نویسندگان | ||
| مسلم نامجو1؛ محمدعلی صالحی* 2 | ||
| 1گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه جیرفت، جیرفت، ایران. | ||
| 2دانشکده کشاورزی، آب، غذا و فراسودمندها، واحد مهاباد، دانشگاه آزاد اسلامی، مهاباد، ایران | ||
| چکیده | ||
| پژوهش حاضر با هدف تحلیل کمی تلفات دانه و تراز انرژی در سامانههای مختلف برداشت گندم در منطقه مریوان انجام شد. آزمایش در قالب طرح بلوک کاملاً تصادفی با سه تیمار برداشت مکانیزه کمباینی، مکانیزه مرحلهای و نیمهمکانیزه و چهار تکرار طراحی گردید. نهادههای مصرفی و خروجی ثبت و معادل انرژی تبدیل شدند. تلفات دانه در مراحل برداشت اندازهگیری شدند. نتایج نشان داد میانگین تلفات کل دانه در برداشت کمباینی 95/6 درصد بود که بهطور معناداری کمتر از برداشت مرحلهای مکانیزه ( 03/10 درصد) و نیمهمکانیزه (76/10 درصد) بود (P<0.05). همچنین، انرژی خالص و بازده انرژی در برداشت کمباینی به ترتیب 26371 مگاژول در هکتار و 56/1 برآورد شد که نسبت به دو روش دیگر افزایش چشمگیری داشت. برای تحلیل جامعتر، از تحلیل مؤلفههای اصلی (PCA) و تحلیل تشخیص خطی (LDA) استفاده شد. PCA نشان داد که دو مؤلفه نخست 1/83 درصد از واریانس کل را تبیین کردند و بار مثبت 91/0- 89/0 بر عملکرد، انرژی خالص و بازده انرژی و بار منفی 94/0 بر تلفات انرژی برداشت، مؤلفه اول را به شاخص برداشت و مدیریت انرژی تبدیل نمود. تحلیل LDA با تابع LD1 توانست 2/89 درصد واریانس بینگروهی را توضیح دهد و دقت طبقهبندی 7/91 درصد، ضریب کاپا 88/0 و AUC برابر 2/94 درصد را به دست آورد و مرزبندی واضحی میان تیمارها ایجاد کرد. نتایج تلفیقی سه رویکرد آماری نشان داد مکانیزاسیون کامل برداشت علاوه بر کاهش 5/35درصد تلفات انرژی، موجب بهبود بهرهوری کل سیستم برداشت و در شرایط اقلیمی مشابه، بهعنوان گزینهی فنی–پایدار برتر قابل توصیه است. | ||
| کلیدواژهها | ||
| انرژی خالص؛ بازده انرژی؛ تحلیل تشخیص خطی؛ تحلیل مؤلفههای اصلی؛ تلفات دانه | ||
| مراجع | ||
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