scholarly journals AN EXPERIMENTAL METHOD OF STUDYING SUBSTITUTION AND DECOMPOSITION REACTIONS BY MEANS OF PHOTOELECTRIC CELL. I. ABSORPTION OF LIGHT OF WAVE LENGTHS 3650Å AND 4360Å BY VAPOURS OF VARIOUS HALOGEN DERIVATIVES OF ETHANE

1935 ◽  
Vol 10 (2) ◽  
pp. 43-50 ◽  
Author(s):  
Senzo Hamai
Keyword(s):  
Experimental Method ◽  
Photoelectric Cell ◽  
Decomposition Reactions ◽  
Absorption Of Light ◽  
Derivatives Of

scholarly journals Identification of pigments in artworks by inverse tangent derivative of spectrum and a new filtering method

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
F. Fazlali ◽  
S. Gorji Kandi
Keyword(s):  
Reflectance Spectrum ◽  
Practical Method ◽  
Chemical Methods ◽  
Munk Function ◽  
Absorption Of Light ◽  
Spectrophotometric Data ◽  
First Time ◽  
Non Destructive ◽  
Derivatives Of

Abstract Employing an economical and non-destructive method for identifying pigments utilized in artworks is a significant aspect for preserving their antiquity value. One of the non-destructive methods for this purpose is spectrophotometry, which is based on the selected absorption of light. Mathematical descriptive methods such as derivatives of the reflectance spectrum, the Kubelka–Munk function and logarithm have been employed for the characterization of the peak features corresponding to the spectrophotometric data. In the present study, the mentioned mathematical descriptive methods were investigated with the aim to characterize the constituents of an Iranian artwork but were not efficient for the samples. Therefore, inverse tangent derivative equation was developed on spectral data for the first time, providing considerable details in the profile of reflectance curves. In the next part, to have a simpler and more practical method it was suggested to use filters made up of pure pigments. By using these filters and placing them on the samples, imaging was done. Then, images of samples with and without filter were evaluated and pure pigments were distinguished. The mentioned methods were also used to identify pigments in a modern Iranian painting specimen. The results confirmed these methods with reliable answers indicating that physical methods (alongside chemical methods) can also be effective in determining the types of pigments.

scholarly journals Identification of pigments in artworks by inverse tangent derivative of spectrum and a new filtering method

2020 ◽  
Author(s):  
Fatemeh Fazlali ◽  
Saeideh GORJI KANDI
Keyword(s):  
Reflectance Spectrum ◽  
Practical Method ◽  
Chemical Methods ◽  
Iranian Art ◽  
Munk Function ◽  
Absorption Of Light ◽  
Spectrophotometric Data ◽  
First Time ◽  
Non Destructive ◽  
Derivatives Of

Abstract Nowadays, employing an economical and non-destructive method for identifying pigments utilized in the artworks is vital due to their antiquity value. One of the non-destructive methods for this purpose is spectrophotometry, which is based on the selected absorption of light. Mathematical descriptive methods such as derivatives of the reflectance spectrum, the Kubelka-­Munk function and logarithm are being used to clarify the spectrophotometric data. In the present study, the mentioned mathematical descriptive methods were applied to identify the most common pigments used in Iranian artwork but were not efficient for the samples. Therefore, inverse tangent derivative equation was used on spectral data for the first time and a considerable difference in the profile of reflectance curves was found. In the next part, to have a simpler and more practical method it was suggested to use filters made up of pure pigments. By using these filters and placing them on the samples, imaging was done. Then, images of samples with and without filter were evaluated and pure pigments were distinguished. The mentioned methods were also exerted to identify pigments in a modern Iranian art painting specimen. The results confirmed that these methods provide reliable answers indicating that physical methods (alongside chemical methods) can also be effective in determining the types of pigments.

Experimental Method on Rapid Identification of Autocatalysis in Decomposition Reactions

2014 ◽  
Vol 30 (7) ◽  
pp. 1215-1222 ◽  
Author(s):  
YANG Ting ◽  
◽  
CHEN Li-Ping ◽  
CHEN Wang-Hua ◽  
ZHANG Cai-Xing ◽  
...  
Keyword(s):  
Experimental Method ◽  
Rapid Identification ◽  
Decomposition Reactions

scholarly journals Identification of pigments in artworks by inverse tangent derivative of spectrum and a new filtering method

2020 ◽  
Author(s):  
Fatemeh Fazlali ◽  
Saeideh GORJI KANDI
Keyword(s):  
Reflectance Spectrum ◽  
Practical Method ◽  
Chemical Methods ◽  
Munk Function ◽  
Absorption Of Light ◽  
Spectrophotometric Data ◽  
First Time ◽  
Non Destructive ◽  
Derivatives Of

Abstract Employing an economical and non-destructive method for identifying pigments utilized in artworks is a significant aspect for preserving their antiquity value. One of the non-destructive methods for this purpose is spectrophotometry, which is based on the selected absorption of light. Mathematical descriptive methods such as derivatives of the reflectance spectrum, the Kubelka-­Munk function and logarithm have been employed for the characterization of the peak features corresponding to the spectrophotometric data. In the present study, the mentioned mathematical descriptive methods were investigated with the aim to characterize the constituents of an Iranian artwork but were not efficient for the samples. Therefore, inverse tangent derivative equation was developed on spectral data for the first time, providing considerable details in the profile of reflectance curves. In the next part, to have a simpler and more practical method it was suggested to use filters made up of pure pigments. By using these filters and placing them on the samples, imaging was done. Then, images of samples with and without filter were evaluated and pure pigments were distinguished. The mentioned methods were also used to identify pigments in a modern Iranian painting specimen. The results confirmed these methods with reliable answers indicating that physical methods (alongside chemical methods) can also be effective in determining the types of pigments.

Physical Properties of TCNQ Salts with N-Methyl Derivatives of Pyridine

1982 ◽  
Vol 85 (1) ◽  
pp. 257-263 ◽  
Author(s):  
A. Graja ◽  
M. Przybylski ◽  
B. Butka ◽  
R. Swietlik
Keyword(s):  
Physical Properties ◽  
Methyl Derivatives ◽  
Derivatives Of
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