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Die-Swell Performance of Colored Poly(m-phenylene isophthalamide)(PMIA)Fiber Prepared by Wet Spinning

Journal of Donghua University(English Edition) 2017年第1期34卷 27-31页

作者：刘立起王旭李红方琳孙晋良任慕苏于俊荣胡祖明俞鸣明 Research Center of Composite Materials Shanghai University State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University

The colored poly(m-phenylene isophthalamide)(PMIA)spinning solution was prepared by wet spinning and the die-swell of the colored PMIA spinning solution was done when it was extruded from a die in this *** properties and structures of colored PMIA fibers were characterized by scanning electron microscopy(SEM).The colored PMIA spinning dopes were first commixed in a pressurizer and then spun into a coagulation *** effect of die swell on the colored PMIA solution was resulted from the viscoelastic properties of the colored PMIA solution in the spinning *** results showed that the die-swell ratio of the colored PMIA solution increased linearly with increasing the pressure and die length/diameter ratio(L/D).At the same pressure and L/D,the die-swell ratio decreased with the increase of filter layers and ***,optimized spinning parameters of the dopedyed PMIA fiber were obtained.

关键词： colored poly(m-phenylene isophthalamide)(PMIA) solution die-swell effect gravimetric method die-swell ratio

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A study of laboratory testing and calculation methods for coal sorption isotherms

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Journal of Coal Science & Engineering(China) 2013年第2期19卷 193-202页

作者： Lei ZHANG Ting-Xiang REN Nai AZIZ Faculty of Engineering University of Wollongong Wollongong 2500 Australia

Measurement of the volume of gas adsorbed per unit mass of coal with increasing pressure at a constant temperature produces an isotherm that describes the gas storage capacity of this type of coal. The accurate testing and interpretation of coal sorption isotherm plays an important role in the areas of coal mine methane drainage, coalbed methane （CBM） reservoir resource assessment, enhanced coalbed methane （ECBM） recovery, as well as the carbon dioxide （CO2） sequestration in deep coal seams or similar geological formations. Different coal sorption isotherm testing apparatus and associated calculation methods are critically reviewed and presented in this paper. These include both volumetric and gravimetric based methods, as well as experimental sorption tests with confining stress and direction sorption methods. The volumetric techniques utilise experimental apparatus with sample cell and injection pump and that with both sample cell and reference cell. Whilst the gravimetric approachesinclude methods with sample cell and suspension magnetic balance and that with both sample cell and reference cell. Different testing methods are compared and discussed in this study. A unique in-house-built coal sorption isotherm testing apparatus at the University of Wollongong was presented together with the calculation method, procedures and experimental results. The isotherm results can be calculated by both Soave-Redlich-Kwong （SRK） equation and calibration cure methods which can be used directly to convert the volume of adsorbed gas in different test conditions to standard condition （NTP）.

关键词： sorption isotherm coalbed methane coal mine gas apparatus calculation method volumetric method gravimetric method

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Geophysical and Petro-Structural Characteristics of the Tarkwaïan and Associated Formations of the Gontougo Region (Northeastern Côte d’Ivoire)

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Open Journal of Geology 2023年第11期13卷 1240-1253页

作者： Ehui Beh Jean Constantin Aka Yao Augustin Koffi Sahy Anthelme Veh Petanki Soro Amenan Gisèle Kouassi Department Earth Sciences and Mineral Resources University Félix Houphou&#235t-Boigny Abidjan C&#244te d’Ivoire

Studies carried out in the Gontougo region aimed to describe the physical and petro-structural properties of the Tarkwaian formations of northeastern Côte d’Ivoire. The methodology developed is focused on the one hand on the gravimetric geophysical method and on the other hand, on petro-structural studies. The geophysical results highlighted two gravimetric facies characterized respectively by high density (ΔBg > 121 mGal) and low density (ΔBg < 114 mGal) anomalies. From a lithological point of view, the denser domains are made up of intrusive rocks dominated by granodiorites and tonalites cutting low density facies composed of Tarkwaian formations (polygenic conglomerates and arkosic sandstones) and volcanics (tuffs and cinerites). Structurally, these different lithological groups are affected by brittle (fractures, faults, strike-slip) and ductile (folds, schistosities and mineral lineations) deformations. These structures are mainly oriented NNW-SSW, WNW-ESE and NE-SW. The description of the sulphide minerals reveals a style of gold mineralization of the Tarkwaian formations.

关键词： gravimetric method Petro-Structural Study Tarkwaïen Gontougo Region Côte d’Ivoire

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Curcumin Extract as a Green Inhibitor of Leaching from Aluminum Cookware at Quasi-Cooking Conditions

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Green and Sustainable Chemistry 2016年第2期6卷 57-70页

作者： Layla A. Al Juhaiman Chemistry Department Faculty of Science King Saud University Riyadh KSA

Curcumin aqueous extract is used successfully as a green corrosion inhibitor at quasi-cooking conditions (90℃) to inhibit leaching from Aluminum cook wares in solutions containing vegetables or meat. Aluminum cook wares were bought from the market from four countries and cut to make the Aluminum samples. Six types of vegetables and three kinds of meat were chosen. Each type of vegetable and meat was used to prepare 30% w/v aqueous solutions. Three methods were used in the present study: gravimetric method, Atomic Absorption and FTIR. gravimetric method was applied to determine the leaching rate and the corrosion inhibition efficiency with/without NaCl. The effect of Curcumin concentration, Tab water, immersion time, alloying elements was investigated. There was a good consistency between gravimetric and Atomic Absorption methods. The adsorption of Curcumin on the aluminum surface was in accordance with Langmuir isotherm. The values of the adsorption constant (Kads) and the free energy of adsorption (Gadso) were calculated and discussed. FTIR spectrum indicated that Curcumin coordinated with Al3+ resulting in the formation of Al3+-Curcumin complex on the metal surface. Using a small amount of Curcumin decreased leaching from Aluminum cook wares into food by 60% - 80% depending about the type of food.

关键词： Aluminum Leaching Curcumin Vegetables Meat gravimetric method Adsorption Isotherm Atomic Absorption method FTIR

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