scholarly journals A suggested modification of the nitrito-nitro isomerization kinetic experiment

1993 ◽  
Vol 70 (7) ◽  
pp. 606
Author(s):  
Smadar Goren ◽  
Marcos Zayat ◽  
Carla Heitner-Wirguin
Keyword(s):  
Kinetic Experiment ◽  
Suggested Modification

scholarly journals Adsorption of Reactive Black M-2R on Different Deacetylation Degree Chitosan

2011 ◽  
Vol 6 (3) ◽  
pp. 155892501100600 ◽  
Author(s):  
Fang Li ◽  
Chunmei Ding
Keyword(s):  
Sorption Process ◽  
Order Kinetic ◽  
Sorption Data ◽  
Kinetic Experiment ◽  
Isotherm Equation ◽  
Degree Of Deacetylation ◽  
Deacetylation Degree ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Effects Of Temperature

Different degree of deacetylation (DD) chitosan was prepared and used for the removal of a Reactive black M-2R (RBM) from aqueous solution. The effects of temperature (298 K~323 K), chitosan dosage, degree of deacetylation on RBM removal were investigated. The adsorption equilibrium was reached within one hour. In order to determine the adsorption capacity, the sorption data were analyzed by using linear form of Langmuir, Freundlich and Tempkin isotherm equation. Langmuir equation shows higher conformity than the other two equations. From the kinetic experiment data, it was found that the sorption process follows the pseudo-second-order kinetic model. Activation energy value for sorption process was found to be 58.28 kJ mol-1. Chitosan with 66% deacetylation degree (DD) exhibited good adsorption performance for RBM. In order to determine the interactions between RBM and chitosan, FTIR analysis was also conducted.

The Study on Airborne Equipments Life Prediction Based on the Finite Element Simulation under Comprehensive Stress

2013 ◽  
Vol 365-366 ◽  
pp. 224-228
Author(s):  
Tian Ma ◽  
Chuan Ri Li ◽  
Shuang Long Rong
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Life Prediction ◽  
Single Point ◽  
Simulation Method ◽  
Distribution Fitting ◽  
Kinetic Experiment ◽  
Element Simulation ◽  
Vibration Stress ◽  
Equipment Lifetime

To predict an airborne equipment lifetime with finite element simulation method, use ANSYS and Flothem, respectively, to analysis vibration stress and temperature stress, corrected by kinetic experiment; then import the results into the failure prediction software-CALCE PWA, set the intensity and duration of stress according to its mission profile, finally get the component failure life prediction results under comprehensive temperature and vibration stress; extract the Monte-Carlo simulation data, use the single point of failure distribution fitting, fault clustering and multipoint distribution fusion method to get the board and the whole machines lifetime and reliability prediction. The design refinement suggestion of the airborne equipment is given at the end of the conclusion.

Evaluation of EDTA as the Chelator in the Biuret Reagent

1973 ◽  
Vol 19 (6) ◽  
pp. 621-623 ◽  
Author(s):  
Harold Van Kley ◽  
Carol S Claywell
Keyword(s):  
Chelating Agent ◽  
Color Development ◽  
Suggested Modification

Abstract Use of ethylenediaminetetraacetate (EDTA) as the chelating agent in the biuret reaction (in place of tartrate or citrate) was investigated. We found that this suggested modification of the reagent results in lower color yields and prolongs the time for color development. The EDTA reagent is more stable if color development is hastened by heating, but conditions are described under which the more customary reagent may be so used.

scholarly journals Performance of composite mineral adsorbents for removing Cu, Cd, and Pb ions from polluted water

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Woo-Ri Lim ◽  
Sung Wook Kim ◽  
Chang-Han Lee ◽  
Eun-Kyeong Choi ◽  
Myoung Hak Oh ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Adsorption Isotherm ◽  
Portland Cement ◽  
Weight Percent ◽  
Adsorption Kinetic ◽  
Polluted Water ◽  
Isotherm Models ◽  
Kinetic Experiment ◽  
Pb Ions ◽  
Mineral Adsorbents

Abstract This study evaluated the efficiency of the removal of heavy metals from contaminated water via adsorption isotherm and kinetic experiments on two composite mineral adsorbents, CMA1 and CMA2. The developed CMA1 (zeolite with clinoptilolite of over 20 weight percent and feldspar of ~10 percent, with Portland cement) and CMA2 (zeolite with feldspar of over 15 weight percent and ~9 percent clinoptilolite, with Portland cement) were applied to remove Cu, Cd, and Pb ions. Based on the adsorption isotherm and kinetic experiments, the adsorbents CMA1 and CMA2 exhibited high removal efficiency for Cu, Cd, and Pb ions in solution compared to other adsorbents. In the adsorption kinetic experiment, CMA2 demonstrated better adsorption than CMA1 with the same initial concentration and reaction time, and Cu, Cd, and Pb ions almost reached equilibrium within 180 min for both CMA1 and CMA2. The results of the adsorption kinetic experiments with pseudo-first-order (PFO) and pseudo-second-order (PSO) models indicated that the PSO model was more suitable than the PFO model. Comparing the Langmuir and Freundlich adsorption isotherm models, the former showed a very slightly higher correlation coefficient (r2) than the latter, indicating that the two models can both be applied to heavy metal solutions on a spherical monolayer surface with a weak heterogeneity of the surface. Additionally, the adsorbents CMA1 and CMA2 demonstrated different removal abilities depending on which heavy metals were used.

A suggested modification to FIGO stage I endometrial cancer

2014 ◽  
Vol 133 (2) ◽  
pp. 192-196 ◽  
Author(s):  
Patrick Aristizabal ◽  
Olivier Graesslin ◽  
Emmanuel Barranger ◽  
Françoise Clavel-Chapelon ◽  
Bassam Haddad ◽  
...  
Keyword(s):  
Endometrial Cancer ◽  
Figo Stage ◽  
Stage I ◽  
Suggested Modification

Suggested Modification of the Technique Coronectomy for Lower Third Molar

2014 ◽  
pp. 1
Author(s):  
Julierme Ferreira Rocha ◽  
Júlio César Silva de Oliveira ◽  
José Wilson Noleto Ramos ◽  
Idelmo Rangel Garcia Júnior ◽  
Eduardo Hochuli-Vieira
Keyword(s):  
Third Molar ◽  
Suggested Modification
Sign in / Sign up

Export Citation Format

Share Document