scholarly journals Protocols for Uranium Carbon Analysis

2021 ◽  
Author(s):  
Philip Tubesing ◽  
Deniece Korzekwa ◽  
Julie Bremser
Keyword(s):  
Carbon Analysis

Pengaruh Pendopingan Karbon Terhadap Struktur Kristal dan Morfologi TIO2

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Frastica Deswardani ◽  
Helga Dwi Fahyuan ◽  
Rimawanto Gultom ◽  
Eif Sparzinanda
Keyword(s):  
Thin Film ◽  
Crystal Structure ◽  
Grain Size ◽  
Tio2 Thin Film ◽  
Crystal Size ◽  
Diffraction Peak ◽  
Carbon Doping ◽  
Tio2 Anatase ◽  
Spray Method ◽  
Carbon Analysis

Telah dilakukan penelitian mengenai pengaruh konsentrasi doping karbon pada lapisan tipis TiO2 yang ditumbuhkan dengan metode spray terhadap struktur kristal dan morfologi TiO2. Hasil karakterisasi SEM menunjukkan bahwa penambahan doping karbon dapat meningkatkan ukuran butir. Lapisan TiO2 doping karbon 8% diperoleh ukuran butir terbesar adalah 1.35 μm, sedangkan ukuran tekecilnya adalah 0.45 μm. Sementara itu, untuk lapisan tipis TiO2 didoping karbon 15% memiliki ukuran butir terbesar yaitu 1.76 μm dan terkecil 0.9 μm. Hasil XRD menunjukkan seluruh puncak difraksi lapisan tipis TiO2 dengan doping karbon 8% dan 15% merupakan TiO2 anatase. Ukuran kristal lapisan TiO2 didoping karbon 8% diperoleh sebesar 638,08 Å dan untuk pendopingan 15% karbon ukuran kristal lapisan tipis TiO2 adalah 638,09 Å, hal ini menunjukkan ukuran kristal kedua sampel tidak mengalami perubahan yang signifikan.   TiO2 thin film with carbon doping has been successfully grown by spray method. The research on the effect of carbon doping on crystal structure and morfology of TiO2 has been prepared by varying carbon concentration (8% and 15% carbon). Analysis of SEM showed that the addition of carbon may increase the grain size. Thin film of TiO2 doped carbon 8% has the largest grain size 1.35 μm, while the smallest grain size is 0.45 μm. Meanwhile, for thin film TiO2 doped carbon 15% has the largest grain size 1.76 μm and smallest 0.9 μm. The XRD results showed the entire diffraction peak of thin film TiO2 doped carbon 8% and 15% were TiO2 anatase. The crystal size of thin film TiO2 doped carbon 8% was obtained at 638.08 Å and for thin film TiO2 doped carbon 15% the crystalline size of TiO2 thin film was 638.09 Å, this shows that the crystal size of both samples did not change significantly.    

Use of the Leco Automatic 70-Second Carbon Analyzer for Total Carbon Analysis of Soils

1970 ◽  
Vol 34 (4) ◽  
pp. 608-610 ◽  
Author(s):  
M. A. Tabatabai ◽  
J. M. Bremner
Keyword(s):  
Total Carbon ◽  
Carbon Analysis

scholarly journals Technical note: Accelerate coccolith size separation via repeated centrifugation

2020 ◽  
Author(s):  
Hongrui Zhang ◽  
Chuanlian Liu ◽  
Luz Maria Mejia ◽  
Heather Stoll
Keyword(s):  
Stable Isotopes ◽  
Angular Velocity ◽  
Carbon Cycle ◽  
Marine Sediment ◽  
Size Fraction ◽  
Technical Note ◽  
Bulk Sediment ◽  
Matlab Code ◽  
Clumped Isotope ◽  
Carbon Analysis

Abstract. Coccolithophore play a key role in the marine carbon cycle and ecosystem. The carbonate shells produced by coccolithophore, named as coccolith, could be well preserved in the marine sediment for million years and become an excellent archive for paleoclimate studies. The micro filtering and sinking-decanting method have been successfully designed for coccolith separation and promoted the development of geochemistry studies on coccolith, such as the stable isotopes and Sr / Ca ratio. However, these two methods are still not efficient enough for the sample-consuming methods. In this study, the trajectory of coccoliths movement during a centrifugation process was calculated in theory and carefully tested by separations in practice. We offer a matlab code to estimate the appropriate parameter, angular velocity at a fixed centrifugation duration, for separating certain coccolith size fractions from bulk sediment. This work could improve the efficiency of coccolith separation, especially for the finest size fraction and make it possible to carry the clumped isotope and radio carbon analysis on coccolith in sediment.

High-resolution hyperspectral-based continuous mineralogical and total organic carbon analysis of the Eagle Ford Group and associated formations in south Texas

AAPG Bulletin ◽  
2020 ◽  
Vol 104 (7) ◽  
pp. 1439-1462 ◽  
Author(s):  
Ahmed Alnahwi ◽  
Tobi Kosanke ◽  
Robert G. Loucks ◽  
James Greene ◽  
Xiuju Liu ◽  
...  
Keyword(s):  
High Resolution ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
South Texas ◽  
Eagle Ford ◽  
Total Organic Carbon Analysis ◽  
Carbon Analysis

scholarly journals Advantage of Specimen Heating in FE-EPMA for Performing Quantitative Trace Carbon Analysis in Steel Materials

2017 ◽  
Vol 23 (S1) ◽  
pp. 1062-1063
Author(s):  
Yuji Tanaka ◽  
Takako Yamashita ◽  
Masayasu Nagoshi
Keyword(s):  
Carbon Analysis

A Rapid Method of Carbon Analysis for Biological Materials

1965 ◽  
Vol 48 (6) ◽  
pp. 1261-1265 ◽  
Author(s):  
L W Smith ◽  
W P Flatt ◽  
K A Barnes ◽  
P J Van Soest
Keyword(s):  
Vanadium Pentoxide ◽  
Induction Furnace ◽  
Molybdenum Trioxide ◽  
Cupric Oxide ◽  
Biological Materials ◽  
Potassium Hydrogen Phthalate ◽  
Hydrogen Phthalate ◽  
Silver Phosphate ◽  
Potassium Hydrogen ◽  
Carbon Analysis

Abstract An induction furnace and a gasometric analyzer have been adapted for the analysis of carbon in biological materials. Samples for analysis must not exceed 70 mg carbon. The number of analyses which can be routinely performed for carbon in an eight-hour day has been increased from 8, by wet combustion, to 50, by the induction furnace method. Hay, concentrate, dried feces, wet feces, milk, and urine have been analyzed by this method with iron, cupric oxide, molybdenum trioxide, and silicic acid used as reagents. Silver phosphate and vanadium pentoxide were required to obtain satisfactory analyses of dried milk. Liquid urine was analyzed successfully by the same methods employed for dried samples except for minor modifications of the combustion tube and catalysts. Analyses on sodium carbonate, glucose, and potassium hydrogen phthalate yielded carbon recoveries of essentially 100%.

Applying Monte-Carlo simulations to optimize an inelastic neutron scattering system for soil carbon analysis

2017 ◽  
Vol 128 ◽  
pp. 237-248 ◽  
Author(s):  
Galina Yakubova ◽  
Aleksandr Kavetskiy ◽  
Stephen A. Prior ◽  
H. Allen Torbert
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Neutron Scattering ◽  
Soil Carbon ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Scattering System ◽  
Carbon Analysis
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