A novel method of determination of wire lag for enhanced profile accuracy in WEDM

2011 ◽  
Vol 35 (2) ◽  
pp. 339-347 ◽  
Author(s):  
S. Sarkar ◽  
M. Sekh ◽  
S. Mitra ◽  
B. Bhattacharyya
Keyword(s):  
Method Of Determination ◽  
Novel Method ◽  
Profile Accuracy

Study on the Spectrophotometric Determination of Trace Cadmium after Flotation Separation with Ternary Association Complex System

2011 ◽  
Vol 356-360 ◽  
pp. 1234-1237
Author(s):  
Xin Rong Wen ◽  
Chang Qing Tu
Keyword(s):  
Complex System ◽  
Trimethyl Ammonium Chloride ◽  
Experimental Conditions ◽  
Method Of Determination ◽  
Quantitative Separation ◽  
Novel Method ◽  
Solid Phases ◽  
Trace Cadmium ◽  
Association Complex

The paper presents a novel method for the flotation separation of Cd2+with ternary association complex system prior to the determination by spectrophotometry. The effects of different parameters,such as the dosages of KI and octadecyl trimethyl ammonium chloride (OTMAC),various salts and acidity etc. on the flotation yield of Cd2+have been investigated to select the experimental conditions. The possible flotation mechanism of Cd2+was discussed.The results showed that by controlling pH2.0,in the presence of 1.0g (NH4)2SO4, when the dosage of 0.1 mol•L-1KI solution was 2.00 mL and 0.01 mol•L-1OTMAC solution was 2.00 mL respectively, the water-insoluble ternary association complex of (OTMAC)2(CdI4) which produced by Cd2+and I-,OTMAC cation (OTMAC+) floated above water phase and liquid-solid phases were formed with clear interface,while Mn2+, Ni2+,Co2+, Zn2+and Al3+could not be floated,so Cd2+was floated quantitatively at pH2.0. Thereby, the quantitative separation of Cd2+from the above metal ions could be achieved.A new method of determination of trace cadmium by flotation separation was established.The proposed method has been successfully applied to the determination of Cd2+in the sample of synthetic water and the flotation yield was 97.2%~108.7%.

Study on Spectrophotometric Determination of Trace Copper after Flotation Separation Using Microcrystalline Adsorption System Loaded with CuI

2013 ◽  
Vol 726-731 ◽  
pp. 516-522
Author(s):  
Xin Rong Wen ◽  
Chang Qing Tu ◽  
Qi Feng Liang ◽  
Hong Wei Guo
Keyword(s):  
Ascorbic Acid ◽  
Environmental Water ◽  
Ammonium Bromide ◽  
Separation Mechanism ◽  
Adsorption System ◽  
Optimum Conditions ◽  
Method Of Determination ◽  
Novel Method ◽  
Aas Method

The paper presents a novel method for the flotation separation of Cu2+ using microcrystalline adsorption system loaded with CuI prior to the determination by spectrophotometry. The effects of different parameters,such as the dosages of KI, ascorbic acid and octadecyl trimethyl ammonium bromide (OTMAB),various salts and acidity etc. on the flotation yield of Cu2+ have been investigated. The possible flotation separation mechanism of Cu2+ was discussed.The results showed that under the optimum conditions,octadecyl trimethyl ammonium bromide cation (OTMAB+) reacted with I- to produce the microcrystalline matter (Ms-M) of (OTMAB+·I-), Cu2+ could be reduced to Cu+ by ascorbic acid,and then Cu+ reacted with I- to form the precipitation of CuI.The precipitation of CuI was quantificationally adsorbed on the surface of Ms-M of (OTMAB+·I-) and was floated above water phase, the liquid-solid phases were formed with clear interface. In this condition, K+,Na+,Ca2+,Mg2+, Zn2+,Co2+,Al3+,Mn2+,Ni2+ and Fe2+ could not be floated.Therefore, Cu2+ was separated completely from the above metal ions.A new spectrophotometric method of determination of trace copper by flotation separation using microcrystalline adsorption system loaded with CuI was established.The proposed method has been successfully applied to the determination of Cu2+ in various environmental water samples, and the results agreed well with those obtained by AAS method.

A novel method for the determination of linting propensity of paper

TAPPI Journal ◽  
2012 ◽  
Vol 11 (10) ◽  
pp. 9-17
Author(s):  
ALESSANDRA GERLI ◽  
LEENDERT C. EIGENBROOD
Keyword(s):  
Ash Content ◽  
The Novel ◽  
Offset Printing ◽  
Excellent Correlation ◽  
End Conditions ◽  
Bottom Side ◽  
Novel Method ◽  
Total Fraction

A novel method was developed for the determination of linting propensity of paper based on printing with an IGT printability tester and image analysis of the printed strips. On average, the total fraction of the surface removed as lint during printing is 0.01%-0.1%. This value is lower than those reported in most laboratory printing tests, and more representative of commercial offset printing applications. Newsprint paper produced on a roll/blade former machine was evaluated for linting propensity using the novel method and also printed on a commercial coldset offset press. Laboratory and commercial printing results matched well, showing that linting was higher for the bottom side of paper than for the top side, and that linting could be reduced on both sides by application of a dry-strength additive. In a second case study, varying wet-end conditions were used on a hybrid former machine to produce four paper reels, with the goal of matching the low linting propensity of the paper produced on a machine with gap former configuration. We found that the retention program, by improving fiber fines retention, substantially reduced the linting propensity of the paper produced on the hybrid former machine. The papers were also printed on a commercial coldset offset press. An excellent correlation was found between the total lint area removed from the bottom side of the paper samples during laboratory printing and lint collected on halftone areas of the first upper printing unit after 45000 copies. Finally, the method was applied to determine the linting propensity of highly filled supercalendered paper produced on a hybrid former machine. In this case, the linting propensity of the bottom side of paper correlated with its ash content.

Development of a method for multielemental determination in water by EDXRF with radioisotopic source of 238Pu.

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Camilo Fuentes Serrano ◽  
Juan Reinaldo Estevez Alvares ◽  
Alfredo Montero Alvarez ◽  
Ivan Pupo Gonzales ◽  
Zahily Herrero Fernandez ◽  
...  
Keyword(s):  
Thin Layer ◽  
Expanded Uncertainty ◽  
Considerable Decrease ◽  
X Ray ◽  
Precipitation Efficiency ◽  
Method Of Determination ◽  
Sensitivity Curves ◽  
Order Of Magnitude ◽  
Metrological Parameters

A method for determination of Cr, Fe, Co, Ni, Cu, Zn, Hg and Pb in waters by Energy Dispersive X Ray Fluorescence (EDXRF) was implemented, using a radioisotopic source of 238Pu. For previous concentration was employed a procedure including a coprecipitation step with ammonium pyrrolidinedithiocarbamate (APDC) as quelant agent, the separation of the phases by filtration, the measurement of filter by EDXRF and quantification by a thin layer absolute method. Sensitivity curves for K and L lines were obtained respectively. The sensitivity for most elements was greater by an order of magnitude in the case of measurement with a source of 238Pu instead of 109Cd, which means a considerable decrease in measurement times. The influence of the concentration in the precipitation efficiency was evaluated for each element. In all cases the recoveries are close to 100%, for this reason it can be affirmed that the method of determination of the studied elements is quantitative. Metrological parameters of the method such as trueness, precision, detection limit and uncertainty were calculated. A procedure to calculate the uncertainty of the method was elaborated; the most significant source of uncertainty for the thin layer EDXRF method is associated with the determination of instrumental sensitivities. The error associated with the determination, expressed as expanded uncertainty (in %), varied from 15.4% for low element concentrations (2.5-5 μg/L) to 5.4% for the higher concentration range (20-25 μg/L).

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