مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

Investigating the effect of false twist texturing process on the

Investigating the effect of false twist texturing process on the color coordinates variation of spun-dyed polyester filament yarns
, M. Mohades Mojtahedi, M. Amani Tehran1 B. Azimi*
Abstract
In this study, variation of color coordinates of spun-dyed polyester filament yarns subjected to the false twist texturing process was investigated. Furthermore the effect of different processing parameters including D/Y ratio, twist, heater temperature, texturing speed , overfeed, draw ratio and intermingling process on the variation of color coordinates of textured yarns was studied. Finally the magnitude of color variation was analyzed with studying of the structure and crimp properties of yarns. Results showed that the nature of texturing and intermingling process had significant effect on color variation of yarns but different processing parameters had no significant effect. The level of these variations can be expressed with observing the fiber geometry change along the texturing process.
Keywords: Color variations, False twist texturing, processing parameters

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مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 02:08 ب.ظ
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Effect of LED Light Sources on Color Properties of Objects

Effect of LED Light Sources on Color Properties of Objects
Saeideh Gorji Kandi, Mahdi Safi, Farhad Moghareh Abed, Nejmeh Khalili1

Abstract
 Recently LED light sources have become in considering the different industries. Due to the usage of these light sources it is of interest to investigate the color characteristics of them and their influence on the color appearance of the objects. In the present study, the spectral characteristics and color changes of objects under LED light sources in comparison to standard illuminants are concluded. To this end, two series of white LEDs were selected and the color inconstancies were computed for two sets of color samples included 1269 Munsell data set and a set of 547 dyed polyester fabric samples. The results showed that for Munsell chips, the warm series of white LED acts almost similar to A illuminant however it causes more color inconstancies for the textile samples. The other group of white LED gives the poorest color constancy results on both the Munsell and the textile samples in comparison to the other light sources. Therefore, it seems that for the industrial applications especially textile industry, LED light sources need to be modified.
 Keywords: Light sources, LED, Color Inconstancy

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مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 02:04 ب.ظ
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ﺗﺨﻤﻴﻦ ﻏﻠﻈﺖ ﻣﺤﻠﻮل رﻧﮕﻲ ﺗﻚ ﺟﺰﻳﻲ ﺑﻮﺳﻴﻠﻪ ﭘﻮﻳﺸﮕﺮ ﺑﻪ روش

ﺗﺨﻤﻴﻦ ﻏﻠﻈﺖ ﻣﺤﻠﻮل رﻧﮕﻲ ﺗﻚ ﺟﺰﻳﻲ ﺑﻮﺳﻴﻠﻪ ﭘﻮﻳﺸﮕﺮ ﺑﻪ روش
ﺷﺒﻜﻪ ﻋﺼﺒﻲ
 ﻣﻨﺼﻮر ﻣﺎﻓﻲ، ﺳﻴﺪ ﺣﺴﻴﻦ اﻣﻴﺮﺷﺎﻫﻲ ، ﻋﻠﻲ ﺷﻤﺲ ﻧﺎﺗﺮی
ﭼﻜﻴﺪه
در اﻳﻦ ﺗﺤﻘﻴﻖ ﺳﻌﻲ ﺷﺪه اﺳﺖ ﭘﺲ از ﺗﻬﻴﻪ ﺗﺼﻮﻳﺮ از ﻣﺤﻠﻮلﻫﺎی ﺗﻚ ﺟﺰﻳﻲ رﻧﮕﺰا ﺑﺎ اﺳﺘﻔﺎده از ﭘﻮﻳﺸﮕﺮ ﺑﻪ ﻣﻨﻈﻮر ﺑﺮﻗﺮاری ﻳﻚ راﺑﻄﻪ درﺳﺖ و ﻣﻨﻄﻘﻲ ﺑﻴﻦ ﻣﻘﺎدﻳﺮ ﭘﺎراﻣﺘﺮﻫﺎی رﻧﮕﻲ RGB و ﻏﻠﻈﺖ ﻣﺤﻠﻮلﻫﺎ از ﺷﺒﻜﻪ ﻋﺼﺒﻲ اﺳﺘﻔﺎده ﮔﺮدد. ﺑﻪ اﻳﻦ ﻣﻨﻈﻮر از 7 ﺷﺒﻜﻪ ﺑﺎ ﻣﻌﻤﺎریﻫﺎی ﻣﺨﺘﻠﻒ اﺳﺘﻔﺎده ﮔﺮدﻳﺪ. ﭘﺲ از ﺗﺨﻤﻴﻦ ﻏﻠﻈﺖ ﻧﻤﻮﻧﻪﻫﺎ ﻣﻘﺪار درﺻﺪ ﺧﻄﺎی ﻧﺴﺒﻲ ﺗﺨﻤﻴﻦ ﻏﻠﻈﺖ ﻣﺤﺎﺳﺒﻪ ﮔﺮدﻳﺪ و ﺑﺎ ﻧﺘﺎﻳﺞ ﺗﺨﻤﻴﻦ ﻏﻠﻈﺖ ﺑﻪ اﺳﺘﻔﺎده از روش ﻣﺘﺪاول ﺟﺬب ﺳﻨﺠﻲ و ﻃﻴﻒ ﺟﺬﺑﻲ ﻣﻘﺎﻳﺴﻪ ﮔﺮدﻳﺪ. ﻧﺘﺎﻳﺞ ﺑﺪﺳﺖ آﻣﺪه ﻧﺸﺎن دادﻧﺪ ﻛﻪ روش ﻣﻌﺮﻓﻲ ﺷﺪه دارای ﻣﻘﺪار ﺧﻄﺎی ﻛﻤﺘﺮی ﻧﺴﺒﺖ ﺑﻪ روش ﻣﺘﺪاول ﺟﺬبﺳﻨﺠﻲ ﻣﻲﺑﺎﺷﺪ.
واژهﻫﺎی ﻛﻠﻴﺪی: ﭘﻮﻳﺸﮕﺮ، ﻣﺤﻠﻮل رﻧﮕﺰا، ﺟﺬبﺳﻨﺠﻲ، ﺗﻌﻴﻴﻦ ﻏﻠﻈﺖ، ﺷﺒﻜﻪ ﻋﺼﺒﻲ

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مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 02:00 ب.ظ
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ﺗﺎﺛﻴﺮ ﺑﺎﻓﺘﺎر ﭘﺎرﭼﻪ در ﻣﺨﺘﺼﺎت رﻧﮕﻲ ﺑﻪ دﺳﺖ آﻣﺪه از اسکنر

ﺗﺎﺛﻴﺮ ﺑﺎﻓﺘﺎر ﭘﺎرﭼﻪ در ﻣﺨﺘﺼﺎت رﻧﮕﻲ ﺑﻪ دﺳﺖ آﻣﺪه از اﺳﻜﻨﺮ
 ﺳﻴﺪ ﺣﺴﻴﻦ اﻣﻴﺮﺷﺎﻫﻲ ، ﺣﺴﻴﻦ ﻓﺸﻨﺪی، ﻣﺤﻤﺪ اﻣﺎﻧﻲ ﺗﻬﺮان ، ﺳﻌﻴﺪه ﮔﺮﺟﻲ ﻛﻨﺪی

ﭼﻜﻴﺪه
در اﻳﻦ ﻣﻘﺎﻟﻪ ﺗﺎﺛﻴﺮ ﺑﺎﻓﺘﺎر ﭘﺎرﭼﻪ در ﻧﺘﺎﻳﺞ ﺣﺎﺻـﻠﻪ از ﺳـﻨﺠﺶ رﻧـﮓ آن ﺗﻮﺳـﻂ اﺳـﻜﻨﺮ ﻣـﻮرد ﻣﻄﺎﻟﻌـﻪ و ﺑﺮرﺳـﻲ ﻗـﺮار ﮔﺮﻓﺘﻪاﺳﺖ. ﺑﺮای اﻳﻦ ﻣﻨﻈﻮر، اﺑﺘﺪا ﻧﺸﺎن داده ﺷﺪ ﻛﻪ ﭼﺎرتﻫﺎی رﻧﮕﻲ اﺳﺘﺎﻧﺪارد ﻧﻈﻴﺮ ﭼﺎرت ﻛﺪاک Q_60 در ﺗﻮﺻﻴﻒ اﺳﻜﻨﺮ ﺑﺮای اﻧﺪازهﮔﻴﺮی رﻧﮓ ﭘﺎرﭼﻪﻫﺎﻳﻲ ﺑﺎ ﺑﺎﻓﺖﻫﺎی ﻣﺨﺘﻠﻒ، ﻣﻮﺟﺐ ﺑﻪ وﺟﻮد آﻣـﺪن ﻣﻘـﺎدﻳﺮ اﺧـﺘﻼف رﻧـﮓ ﺑـﺎﻻﻳﻲ  ﻣﻲﺷﻮﻧﺪ. در ﻣﺮﺣﻠﻪ ﺑﻌﺪ، ﭘﺎرﭼﻪﻫﺎﻳﻲ ﺑﺎ ﻓﺎمﻫﺎی ﻳﻜﺴﺎن و ﺑﺎﻓﺖﻫﺎی ﻣﺨﺘﻠﻒ (8 ﺑﺎﻓﺖ ﺑﺮای ﻫﺮ ﻓﺎم)، ﺗﻬﻴﻪ ﮔﺮدﻳﺪﻧﺪ ﻛﻪ از آﻧﻬﺎ در ﻣﺮاﺣﻞ آﻣﻮزش و آزﻣﺎﻳﺶ اﺳﻜﻨﺮ، اﺳﺘﻔﺎده ﮔﺮدﻳﺪ. ﻧﺘﺎﻳﺞ ﺣﺎﺻﻠﻪ ﻧﺸﺎن داد ﻛﻪ ﺑﺎ اﻓﺰاﻳﺶ ﺗﻔﺎوت ﺳﺎﺧﺘﺎری، ﺑـﻴﻦﺑﺎﻓﺖﻫﺎ ﻳﻲ ﻛﻪ در ﻣﺮاﺣﻞ آﻣﻮزش و آزﻣﺎﻳﺶ اﺳﻜﻨﺮ ﻣﻮرد اﺳﺘﻔﺎده ﻗﺮار ﮔﺮﻓﺘﻪاﻧﺪ، ﻣﻴﺎﻧﮕﻴﻦ اﺧﺘﻼف رﻧﮓ ﺗﺨﻤﻴﻦ زدهﺷﺪه ﺑﻪوﺳﻴﻠﻪ اﺳﻜﻨﺮ در ﻣﻘﺎﻳﺴﻪ ﺑﺎ رﻧﮓ واﻗﻌﻲ آﻧﻬﺎ ﻛﻪ ﺗﻮﺳﻂ اﺳﭙﻜﺘﺮوﻓﺘﻮﻣﺘﺮ اﻧﺪازهﮔﻴـﺮی ﺷـﺪه اﺳـﺖ، اﻓـﺰاﻳﺶ ﻣـﻲ ﻳﺎﺑـﺪ و اﺧﺘﻼف ﺣﺎﺻﻠﻪ واﺑﺴﺘﮕﻲ ﻛﺎﻣﻞ ﻣﺮﺣﻠﻪ ﺗﻮﺻﻴﻒ اﺳﻜﻨﺮ ﺑﻪ ﻧﻮع ﺑﺎﻓﺖ ﻣﻮرد اﺳﺘﻔﺎده را ﻧﺸﺎن ﻣﻲدﻫﺪ. در ﻫﺮﺣﺎل ﻧﺘﺎﻳﺞ اﻳﻦ ﺗﺤﻘﻴﻖ ﻧﺸﺎن ﻣﻲدﻫﻨﺪ ﻛﻪ ﺑﺎ اﻓﺰاﻳﺶ ﻋﻤﻖ ﺑﻴﺘﻲ دادهﻫﺎی اﻧﺪازهﮔﻴﺮیﺷﺪه ﺗﻮﺳﻂ اﺳﻜﻨﺮ، واﺑﺴـﺘﮕﻲ ﻣـﺬﻛﻮر ﺗـﺎ ﺣـﺪی ﻛﺎﻫﺶ ﻣﻲﻳﺎﺑﺪ .
واژهﻫﺎی ﻛﻠﻴﺪی: اﺳﻜﻨﺮ، ﺗﻮﺻﻴﻒ ﻛﺎﻟﺮﻳﻤﺘﺮی، ﭘﺎرﭼﻪ، ﺑﺎﻓﺖ، ﻋﻤﻖ ﺑﻴﺘﻲ

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مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 01:56 ب.ظ
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واﺑﺴﺘﮕﻲ ﺗﻮﺻﻴﻒ ﻛﺎﻟﺮﻳﻤﺘﺮﻳﻚ دﺳﺘﮕﺎهﻫﺎی اﻧﺪازهﮔﻴﺮی رﻧﮓ

واﺑﺴﺘﮕﻲ ﺗﻮﺻﻴﻒ ﻛﺎﻟﺮﻳﻤﺘﺮﻳﻚ دﺳﺘﮕﺎهﻫﺎی اﻧﺪازهﮔﻴﺮی رﻧﮓ دﻳﺠﻴﺘﺎل ﺑﻪ
ﻣﺠﻤﻮﻋﻪ ﻧﻤﻮﻧﻪ ﻣﻮرد اﺳﺘﻔﺎده
 اﺑﻮاﻟﻔﻀﻞ آﻓﺎﻧﻮری ،ﺣﺴﻴﻦ ﻓﺸﻨﺪی ، ﺳﻴﺪ ﺣﺴﻴﻦ اﻣﻴﺮﺷﺎﻫﻲ ، ﻣﺤﻤﺪ اﻣﺎﻧﻲ ﺗﻬﺮان
ﭼﻜﻴﺪه
ﻓﺮآﻳﻨﺪ ﺗﻮﺻﻴﻒ ﻛﺎﻟﺮﻳﻤﺘﺮﻳﻚ اﺳﻜﻨﺮ و دورﺑﻴﻦ دﻳﺠﻴﺘﺎل ﺑﺮای ﻛﺎﻻﻫﺎﻳﻲ ﺑﺎ ﺧﺼﻮﺻﻴﺎت ﻃﻴﻔﻲ ﻣﺘﻔـﺎوتﺑﺮرﺳـﻲ ﮔﺮدﻳـﺪ ه اﺳﺖ ﺑﻪ. ﻣﻨﻈﻮر ارزﻳﺎﺑﻲ ﻓﺮآﻳﻨﺪ ﺗﻮﺻﻴﻒ و ﻣﻴﺰان واﺑﺴﺘﮕﻲ آن ﺑﻪ ﻧﻮع ﻛـﺎﻻی ﺑـﻪ ﻛﺎررﻓﺘـﻪ در ﻣﺮﺣﻠـﻪ آﻣـﻮزش، ﻣـﺎﺗﺮﻳﺲ ﺗﺒﺪﻳﻞ ﺑﻪدﺳﺖآﻣﺪه ﺑﺮای ﻛﺎﻻﻫﺎی ﻣﺨﺘﻠﻒ در ﻣﺮﺣﻠﻪ آﻣﻮزش ﺑﻪوﺳﻴﻠﻪ ﻧﻤﻮﻧﻪﻫـﺎﻳﻲ از ﻫﻤـﺎن ﻛـﺎﻻ (ﻏﻴـﺮ از ﻧﻤﻮﻧـﻪ ﻫـﺎی  ﺑﻪﻛﺎررﻓﺘﻪ در ﻣﺮﺣﻠﻪ آﻣﻮزش) و ﻛﺎﻻﻫﺎی دﻳﮕﺮ، ﻣﻮرد آزﻣﺎﻳﺶ ﻗﺮارﮔﺮﻓﺘ ﻪ و ﻣﻴﺰان اﺧﺘﻼفرﻧﮓ ﺑﻴﻦ ﻧﺘﺎﻳﺞ ﺑﻪدﺳﺖآﻣﺪه از اﺳﻜﻨﺮ و دورﺑﻴﻦ دﻳﺠﻴﺘﺎل ﺑﺎ ﻧﺘﺎﻳﺞ ﺣﺎﺻـﻞ از اﺳـﭙﻜﺘﺮوﻓﺘﻮﻣﺘﺮ در ﻗﺎﻟـﺐ ﻣﻴـﺎﻧﮕﻴﻦ، ﺣـﺪ اﻛﺜﺮ، ﺣـﺪاﻗﻞ و اﻧﺤـﺮاف ﻣﻌﻴـﺎر اﺧﺘﻼف رﻧﮓ آزﻣﺎﻳﺸﻲ، ﺑﺮای ﻧﻤﻮﻧﻪﻫﺎی ﻣﻮرد آزﻣﺎﻳﺶ ﺑﻪ ﻋﻨﻮان ﻣﻌﻴﺎری ﺟﻬﺖ ارزﻳﺎﺑﻲ ﻛﺎراﻳﻲ ﻓﺮآﻳﻨﺪ ﺗﻮﺻﻴﻒ ﺑﻪﻛﺎرﮔﺮﻓﺘﻪ ﺷﺪه اﺳﺖ. ﻧﺘﺎﻳﺞ ﺣﺎﺻﻞ از اﻳﻦ ﻛﺎر ﺗﺤﻘﻴﻘﺎﺗﻲ ﻧﺸﺎن ﻣﻲدﻫﺪ ﻛﻪ ﻧﺘﺎﻳﺞ ﻣﺮﺣﻠﻪ آزﻣﻮن ﺗﺎﺑﻊ ﺗﺒﺪﻳﻞ ﺑﺮای اﺳﻜﻨﺮ و دورﺑـﻴﻦ دﻳﺠﻴﺘﺎل ﺑﺎ ﻣﺠﻤﻮﻋﻪای ﻣﺘﻔﺎوت از ﻣﺠﻤﻮﻋﻪ ﺑﻪﻛﺎررﻓﺘﻪ در ﺗﻮﺻﻴﻒ آﻧﻬﺎ، ﻣﻨﺠﺮ ﺑﻪ ﻛﺴـﺐ ﺧﻄﺎﻫـﺎی ﻏﻴﺮﻗﺎﺑـﻞ ﻗﺒـﻮﻟﻲ در ﭘﻴﺶﺑﻴﻨﻲ رﻧﮓ ﻛﺎﻻ ﻣﻲﺷﻮد ﻛﻪ ﻋﻠﺖ آن را ﻣﻲﺗﻮان در ﺗﻔﺎوت ﻃﻴﻔﻲ ﻣﻮﺟﻮد ﺑﻴﻦ ﻣﺠﻤﻮﻋﻪﻫﺎی ﻣﺨﺘﻠﻒ داﻧﺴﺖ ﻛﻪ اﻳﻦ ﻧﺘﻴﺠﻪ ﺑﺎ اﺳﺘﻔﺎده از ﺑﺮدارﻫﺎ و ﻣﻘﺎدﻳﺮ وﻳﮋه اﺳﺘﺨﺮاجﺷﺪه ﺑﺮای ﭘﺎﻳﮕﺎه دادهﻫﺎی ﻣﺨﺘﻠﻒ ﻣﻮرد ﺗﺤﻠﻴﻞ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ .
واژهﻫﺎی ﻛﻠﻴﺪی: اﺳﻜﻨﺮ، دورﺑﻴﻦ دﻳﺠﻴﺘﺎل، ﺗﻮﺻﻴﻒ ﻛﺎﻟﺮﻳﻤﺘﺮﻳﻚ، واﺑﺴﺘﮕﻲ ﻃﻴﻔﻲ، ﺗﺤﻠﻴﻞ اﺟﺰای اﺻﻠﻲ (PCA)

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مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 01:53 ب.ظ
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ﺑﺎزﺳﺎزی ﻃﻴﻒ اﻧﺘﻘﺎﻟﻲ ﻣﺤﻠﻮلﻫﺎی ﻣﻮاد رﻧﮕﺰا ﺗﻮﺳﻂ دادهﻫﺎی

ﺑﺎزﺳﺎزی ﻃﻴﻒ اﻧﺘﻘﺎﻟﻲ ﻣﺤﻠﻮلﻫﺎی ﻣﻮاد رﻧﮕﺰا ﺗﻮﺳﻂ دادهﻫﺎی دورﺑﻴﻦ
دﻳﺠﻴﺘﺎﻟﻲ
 ﺳﻴﺪ ﺣﺴﻴﻦ اﻣﻴﺮﺷﺎﻫﻲ ، اﺑﻮاﻟﻔﻀﻞ آﻗﺎﻧﻮری، ﻓﺮﻧﺎز آﮔﻬﻴﺎن
ﭼﻜﻴﺪه
در اﻳﻦ ﻣﻄﺎﻟﻌﻪ از دادهﻫﺎی رﻧﮕﻲ ﺣﺎﺻﻞ از دورﺑﻴﻦ دﻳﺠﻴﺘﺎل ﺑﻪ ﻣﻨﻈﻮر ﺑﺎزﺳﺎزی اﻃﻼﻋﺎت ﻃﻴﻔﻲ ﻳﻚ ﺳﺮی ﻣﺤﻠﻮل ﺷﻔﺎف اﺳﺘﻔﺎده ﮔﺮدﻳﺪه اﺳﺖ. ﺑﺪﻳﻦ ﻣﻨﻈﻮر ﻳﻚ ﺟﻌﺒﻪ ﺗﺼﻮﻳﺮﺑﺮداری و ﻳﻚ ﭘﺎﻳﮕﺎه داده ﺣﺎوی اﻃﻼﻋﺎت ﻃﻴﻔﻲ ﻣﺤﻠﻮلﻫﺎی رﻧﮕﻲ ﺷﻔﺎف ﺳﺎﺧﺘﻪ ﺷﺪهاﻧﺪ. از روشﻫﺎی ﺗﺤﻠﻴﻞ اﺟﺰا اﺻﻠﻲ (PCA) و ﻣﺎﺗﺮﻳﺲ R ﺟﻬﺖ ﺑﺎزﺳﺎزی اﻧﺘﻘﺎل ﻃﻴﻔﻲ ﻣﺤﻠﻮلﻫﺎی رﻧﮕﻲ از ﻣﻘﺎدﻳﺮ واﺑﺴﺘﻪ ﺑﻪ دﺳﺘﮕﺎه RGB ﻳﻚ دورﺑﻴﻦ دﻳﺠﻴﺘﺎﻟﻲ ﻣﻌﻤﻮﻟﻲ اﺳﺘﻔﺎده ﮔﺮدﻳﺪه اﺳﺖ. ﺑﻪ ﻣﻨﻈﻮر ﻓﺮاﻫﻢ ﻧﻤﻮدن دادهﻫﺎی رﻧﮕﻲ ﺑﺎ اﺑﻌﺎد ﺑﺰرﮔﺘﺮ از 3 از دو ﻣﻨﺒﻊ ﻧﻮری اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. ﻧﺘﺎﻳﺞ ﺑﺎزﺳﺎزی ﻣﻨﺤﻨﻲ- ﻫﺎی اﻧﺘﻘﺎﻟﻲ ﻧﺸﺎن ﻣﻲدﻫﺪ ﻛﻪ روش PCA دارای ﻧﺘﺎﻳﺞ ﻣﻨﺎﺳﺒﻲ در ﺣﺎﻟﺘﻲ ﻛﻪ از ﺳﻪ ﺟﺰ اﺻﻠﻲ اﺳﺘﻔﺎده ﺷﻮد، ﻧﻤﻲﺑﺎﺷﺪ و ﻧﺘﺎﻳﺞ ﺑﺎزﺳﺎزی ﺑﺎ اﺳﺘﻔﺎده از 6 ﺟﺰ اﺻﻠﻲ ﺑﻬﺒﻮد ﻣﻲﻳﺎﺑﻨﺪ. ﻧﺘﺎﻳﺞ ﺣﺎﺻﻞ از ﺑﻜﺎرﮔﻴﺮی روش ﻣﺎﺗﺮﻳﺲ R ﻧﺸﺎن ﻣﻲدﻫﺪ ﻛﻪ اﻳﻦ روش از دﻗﺖ ﺑﺎﻻﺗﺮی ﺑﺮ اﺳﺎس ﻣﻘﺎدﻳﺮ ﺟﺬر ﻣﻴﺎﻧﮕﻴﻦ ﻣﺮﺑﻌﺎت ﺧﻄﺎ ﻣﺎﺑﻴﻦ ﻃﻴﻒ اﻧﺘﻘﺎﻟﻲ ﺗﺨﻤﻴﻦ زده ﺷﺪه و اﺻﻠﻲ ﻧﺴﺒﺖ ﺑﻪ روش PCA ﺑﺮﺧﻮردار ﻣﻲﺑﺎﺷﺪ. در ﺣﻘﻴﻘﺖ روش ﻣﺎﺗﺮﻳﺲ R دارای ﻗﺪرت ﺑﺎﻻﻳﻲ در ﺑﺎزﺳﺎزی ﻃﻴﻒ اﻧﺘﻘﺎﻟﻲ در اﺑﺘﺪا و اﻧﺘﻬﺎی ﻣﺤﺪوده ﻣﺮﺋﻲ اﺳﺖ در ﺻﻮرﺗﻲ ﻛﻪ روش ﺗﺤﻠﻴﻞ اﺟﺰا اﺻﻠﻲ دارای ﺿﻌﻒ ﻣﺤﺴﻮﺳﻲ در ﺑﺎزﺳﺎزی ﻃﻴﻒ اﻧﺘﻘﺎﻟﻲ در ﻃﻮل ﻣﻮجﻫﺎی ﻣﺬﻛﻮر ﻣﻲﺑﺎﺷﻨﺪ
واژهﻫﺎی ﻛﻠﻴﺪی:ﻃﻴﻒ اﻧﺘﻘﺎﻟﻲ، ﻣﺤﻠﻮل ﻣﻮاد رﻧﮕﺰا، دورﺑﻴﻦ دﻳﺠﻴﺘﺎل، PCA، ﻣﺎﺗﺮﻳﺲ R

ادامه مطلب ...
مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 12:48 ب.ظ
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Wettability of easy- care finished cotton

Wettability of easy- care finished cotton
 Mike Lomas, Mike Lomas, Faheem Uddin
Abstract
 Easy- care finishing of cotton cross- links the adjacent molecular chains in cellulose structure where wettability of finished cotton fabric is significantly reduced or it becomes unwettable. The residual catalyst content at the fiber surface and the cross- linked molecular structure both influence the fabric wettability. The finished cotton fabric would become unwettable following an after- wash treatment, resulting in reduced absorption of pigment paste in fibers. The type of catalyst used in easy- care finishing has direct influence on pigment printingy; generally it enhances the fabric wettability relative to the finished fabric that received a wash- off treatment. The catalyst content at the surface of fibers also affects color strength (K/ S value), and lateral spreading of aqueous print paste on the finished fabric.
 Key Terms: Catalyst/ salt, Cotton fabric, DMDHEU, Easy- care, Wettability

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مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 12:42 ب.ظ
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Removal of chromium(VI) ion from aqueous solutions using acid mo

Removal of chromium(VI) ion from aqueous solutions using acid modified rice husk
 Mohadeseh Mirabdulazimi, Ali Mohammad-khah, Reza Ansari, Mohammad Ali Zanjanchi
Abstract
Rice husk, an agricultural solid waste was used as sorbent for the removal of chromium(VI) from aqueous solution after modification with HCl. The results of the experiment showed that acid treatment of rice husk can improve the sorption efficiency considerably. Effects of pH, Contact time, initial Cr(VI) concentration, adsorbent dosage were studied. Removal of chromium ion was found as highly dependent on pH and initial concentration of Cr(VI) solution. Sorption isotherm investigation showed that equilibrium sorption data were better represented by Freundlich model than the Langmuir model. Our finding in this paper has indicated that very low cost abundant material of rice husk modified with HCl can be effectively used for removal of Cr(VI) ion from effluents such as textile waste waters.
Keywords: Chromium(VI); rice husk; modification; sorption isotherm; aqueous solution

ادامه مطلب ...
مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 12:39 ب.ظ
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