Design and experimental study of electrochemical detector with EWOD for chemical analysis

2012 ◽  
Author(s):  
Kessararat Ugsornrat ◽  
Tawee Pogfai ◽  
Thitima Maturos ◽  
Chanpen Kuruwan ◽  
Anuarat Wisitsoraat ◽  
...  
Keyword(s):  
Experimental Study ◽  
Chemical Analysis ◽  
Electrochemical Detector

scholarly journals EXPERIMENTAL STUDY OF INTERACTION SHALE-FLUID THROUGH IMMERSION TESTS

2002 ◽  
Vol 1 (2) ◽  
pp. 22 ◽  
Author(s):  
Claudio Rabe ◽  
Sérgio Augusto Barreto Da Fontoura ◽  
Franklin Dos Santos Antunes
Keyword(s):  
Experimental Study ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Aqueous Solutions ◽  
Cation Exchange Capacity ◽  
Drilling Fluid ◽  
Small Variation ◽  
Solid Material ◽  
Exchange Capacity ◽  
Water Base

The present work has as objective the study of the behavior of preserved shale samples when immersed in aqueous solutions. The obtained results show that the solutions presented high variations of pH, salinity and electric conductivity, what indicates ionic migration of salts from the rock to the fluid, and small variations of Redox potential. Chemical analysis indicate strong migrations of ions from the rock to the fluid. It can also be observed that the solutions become cloudy, denser and more viscous. Besides, the samples suffer elevations of its water content, small variation of its cation exchange capacity and chemical composition, loss of solid material from superficial disintegration and the development of fractures in the cores. This work contributes to the understanding of the shale behavior in presence of drilling fluid water base.

scholarly journals EXPERIMENTAL STUDY OF INTERACTION SHALE-FLUID THROUGH IMMERSION TESTS

2002 ◽  
Vol 1 (2) ◽  
Author(s):  
Claudio Rabe ◽  
Sérgio Augusto Barreto Da Fontoura ◽  
Franklin Dos Santos Antunes
Keyword(s):  
Experimental Study ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Aqueous Solutions ◽  
Cation Exchange Capacity ◽  
Drilling Fluid ◽  
Small Variation ◽  
Solid Material ◽  
Exchange Capacity ◽  
Water Base

The present work has as objective the study of the behavior of preserved shale samples when immersed in aqueous solutions. The obtained results show that the solutions presented high variations of pH, salinity and electric conductivity, what indicates ionic migration of salts from the rock to the fluid, and small variations of Redox potential. Chemical analysis indicate strong migrations of ions from the rock to the fluid. It can also be observed that the solutions become cloudy, denser and more viscous. Besides, the samples suffer elevations of its water content, small variation of its cation exchange capacity and chemical composition, loss of solid material from superficial disintegration and the development of fractures in the cores. This work contributes to the understanding of the shale behavior in presence of drilling fluid water base.

Experimental Study of Leaching Scandium from Chloride Dust

2012 ◽  
Vol 548 ◽  
pp. 305-308 ◽  
Author(s):  
Song Li Liu
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Chemical Analysis ◽  
Dust Particle ◽  
Acid Concentration ◽  
Orthogonal Experiment ◽  
Raw Material ◽  
Solid Ratio

Scandium is concentrated in the dust during TiO2 chlorization. The dust can be used as a raw material from which Scandium is extracted. Scandium leaching conditions such as leaching acid concentration , liquid-solid ratio , leaching temperature and leaching time is investigated with chemical analysis through the orthogonal experiment. The results show that the optimum leaching conditions is: chloride dust particle size is 44 μ m, leaching acid concentration is 15%, liquid-solid ratio is 2:1, leaching temperature is 28 °C, leaching time is 1 h.

Experimental Study of the Defect Layer on Workpieces, grown by the DMD method

2020 ◽  
Vol 22 (4) ◽  
pp. 6-17
Author(s):  
Dmitrii Ardashev ◽  
◽  
Alexander Dyuryagin ◽  
Damir Galimov ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Chemical Analysis ◽  
Chemical Elements ◽  
Melting Zone ◽  
Defect Layer ◽  
Substrate Material ◽  
Additive Technologies ◽  
Near Surface ◽  
Stellite 6 ◽  
Microscopic Studies

Introduction. At this time, new methods of manufacturing workpieces are gaining great popularity, for example, additive technologies. Methods for growing workpieces by sintering a powder with a laser make it possible to manufacture parts of complex shapes that are impossible or rather difficult to obtain by traditional methods, such as casting, forging, etc. However, the details, obtained by means of additive technologies, in particular the DMD method (Direct Metal Deposition), do not correspond with the accuracy requirements. Consequently, such workpieces require further processing by turning, milling or grinding. To design an operation for machining parts, it is necessary to know the machining allowances, the magnitude of errors formed during the blank operation, so that after its removal the processed part meets the requirements of the drawing. The purpose of the work: experimental study of the size of the defect layer in the near-surface layers of generative workpieces made of Stellite 6 and CuAl10Fe4, grown by DMD method, using microstructural methods. In the work, using a microscope, a study is carried out, which consisted in the visual determination of the defective layer, which differs in structure; measuring its size; carrying out a chemical analysis; determining the nature of the change in microhardness. The research method is a microscopic examination of deposited materials Stellite 6 and CuAl10Fe4 (CuAl10Fe4). From the pictures taken with a microscope, it is possible to establish the linear size of the defect layer. Results and Discussion. Vortex formations are found in the melting zone, its chemical analysis is carried out and it is found that the concentration of chemical elements in these areas changes and includes both elements of the powder material and the substrate material. Measurement of microhardness showed that it decreases with depth from the surface of the deposited material to the substrate. Thus, the use of the technique presented in this paper for microscopic studies of the structure, chemical composition and microhardness of workpieces, grown by the DMD method will allow to predict the value of processing allowances in the future, during the designing of mechanical processing operation of generative workpieces.

Quantum Chemical Analysis and Experimental Study of the Cycloaddition Reaction between Aminoacetylenes and 6-Nitroindolizines. NMR and ab Initio Evidence for the [4+2] Adduct Formation

1999 ◽  
Vol 64 (25) ◽  
pp. 9057-9062 ◽  
Author(s):  
Eugene V. Babaev ◽  
Vahan V. Simonyan ◽  
Konstantin Yu. Pasichnichenko ◽  
Valentina M. Nosova ◽  
Alexander V. Kisin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Chemical Analysis ◽  
Ab Initio ◽  
Quantum Chemical ◽  
Cycloaddition Reaction ◽  
Adduct Formation ◽  
Quantum Chemical Analysis

scholarly journals Is it possible to determine firearm calibre and shooting range from the examination of gunshot residue in close range gunshot wounds? An experimental study

2013 ◽  
Vol 3 (3) ◽  
pp. 232-237 ◽  
Author(s):  
Anisa Gradaščević ◽  
Emina Resić ◽  
Nermin Sarajlić ◽  
Bruno Franjić ◽  
Arif Salkić ◽  
...  
Keyword(s):  
Experimental Study ◽  
Chemical Analysis ◽  
Subcutaneous Tissue ◽  
Gunshot Wounds ◽  
Atomic Absorption Spectrophotometry ◽  
Gunshot Residue ◽  
Entrance Wound ◽  
Close Range ◽  
Lead Nickel ◽  
Shooting Distance

Introduction: The aim of the study was determining the type of weapon and shooting distance depending on chemical analysis of inorganic gunshot residue from the skin gunshot wounds in experimental animals (pigs).Methods: Experimental study was conducted in order to determine components and their percentage in gunshot residue (GSR). In 60 samples, pig skin was shot by fi ring projectiles from four different weapons and from three different distances (contact wound and near contact wound from 5 cm and 10 cm). The methodology included determining the presence of inorganic material: antimony, barium, lead, nickel, zinc and copper in the skin and subcutaneous tissue using atomic absorption spectrophotometry (AAS).Results: Formula for determining weapon type was provided cutt-off points for different weapons, with 78.6% of original grouped cases being correctly classifi ed. Formula for determining weapon type was provided cutt-off points for different distances, with 58.9% of original grouped cases being correctly classified, which was slightly less reliable compared to weapon type discrimination analysis.Conclusion: The presented study showed that chemical analysis of GSR in entrance wound with AAS could be useful in determining the type of weapon, as well as the shooting distance, i.e. in our study, determiningwhether the wound is contact or near contact. This could be particularly useful in postmortally putrefi ed or charred bodies with gunshot wounds.

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