Current Analytical Methods for Qualitative and Quantitative Measurement of d-Xylitol

Zhong-qi, Jiang; Amartey, Samuel; Jiang, Zi‐Hua; Khatiwada, Janak Raj

doi:10.1007/978-3-642-31887-0_11

Cited by 10 publications

(15 citation statements)

References 49 publications

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“…Response Surface Methodology (RSM) with custom central composite design (CCCD) based on a three factors and three levels of variation setup was performed using Design-Expert 7.0 software. The regression procedure fitted the polynomial models represented by the equations (5), (6) and 7.…”

Section: Resultsmentioning

confidence: 99%

“…One of these methods is represented by the adsorption process. Recognized as an efficient, inexpensive and simple to manage procedure [6], the adsorption can be conducted even by using low cost materials such as biomass prepared from flower spikes [7], alginate [8], chitosan [9,10], clays [11,12] composites [13][14][15], adsorbents obtained from vegetal wastes [16,17] including olive cake [18], date wastes [19], seeds [20], coffee grounds [21] etc.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical modelling and prediction of Congo red adsorption on cherry stones activated carbon

Simion¹,

Grigoraș²,

Favier³

et al. 2019

Studia UBB Chemia

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The present paper was aimed to establish mathematical models useful to reduce the time required to discover the appropriate adsorption conditions of Congo Red (an intensively used organic dye) on an activated carbon prepared from cherry stones through calcination. To this purpose, various values of three parameters known as influencing the process, namely dye initial concentration (200 mg/L to 1000 mg/L), pH (2 to 12) and contact time (10 to 180 minutes) between the adsorbent and the adsorbate were variated. The recorded results of the adsorption process were used as data for Response Surface Methodology and Artificial Neural Network and several mathematical equations were generated. The conducted statistical analyses revealed that these equations can accurately express the Congo Red elimination from aqueous solutions. Moreover, the developed procedure is able to predict the process evolution in different conditions than those experimentally tested.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical modelling and prediction of Congo red adsorption on cherry stones activated carbon

Simion¹,

Grigoraș²,

Favier³

et al. 2019

Studia UBB Chemia

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“…En general, la segregación se presenta porque la difusión no es capaz (durante el tiempo que dura la solidificación) de homogeneizar el sólido que se va formando en el proceso de colada, creando una heterogeneidad de tipo químico, donde resultan algunas zonas más ricas en soluto que otras [9], [40]. Durante el cambio de fase, el primer metal que tiende a solidificar tendrá el contenido más bajo de soluto, y la concentración de soluto aumentará en la fase sólida con el progreso de la solidificación [40], [63], [83], produciéndose un material con propiedades físicas y mecánicas no uniformes. El control de la segregación tiene que ver con las altas velocidades de solidificación y la evolución de la microestructura [4].…”

Section: Segregaciónunclassified

“…Se conocen dos tipos de segregación encontradas en las estructuras: la microsegregación y la macrosegregación [23], [84]. Se habla de macrosegregación cuando en el proceso de solidificación del acero, el elemento soluto se rechaza de la dendrita sólida y se enriquece en la fase líquida (siendo el soluto el menos soluble en la fase solida [85]), y con el efecto del flujo de fluidos, el soluto rechazado es arrastrado y transportado a larga distancia [23], [83]. Este tipo de segregación constituye serios problemas debido a la gran longitud de difusión requerida [23] y se presenta en forma longitudinal en la losa [43].…”

Section: Segregaciónunclassified

Comportamiento termo fluidodinámico del acero en un molde de colada continua: una revisión

González-Rondón

Rengel-Hernández

2021

TecnoL.

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Se ha realizado una revisión de la literatura para identificar qué se sabe en relación con los mecanismos de transferencia de calor, comportamiento termofluidodinámico, características de la solidificación, factores que influyen en el origen de defectos en el acero y uso de estrategias que impactan en una reducción de los defectos que se originan, principalmente, en el molde de la colada continua de acero. La metodología consistió en colectar y sintetizar conocimientos fragmentados, comparar la información encontrada en diferentes fuentes, y dar una respuesta, clara y actualizada, sobre el comportamiento termofluidodinámico del acero en el molde de colada. Como resultado de esta revisión se puede concluir que los defectos graves, como grietas y depresiones, están relacionados con el comportamiento termomecánico; las grietas se asocian al flujo turbulento, variación en el nivel del menisco, alta velocidad de colada y comportamiento inadecuado del polvo colador y la segregación se relaciona con la contracción del acero, temperatura y velocidad de colada y el flujo de calor en el contorno de la pieza. También se ha encontrado que, a pesar de la complejidad de los fenómenos que ocurren en el molde, se puede lograr la formación de una costra de acero adecuada y reducir la aparición de defectos, realizando las acciones que propicien un ajuste adecuado de los parámetros del molde. Además, es imprescindible aplicar prácticas de conicidad y oscilación del molde, configuración de buza y aplicación de campos electromagnéticos, para producir un acero de calidad.

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“…Coupled torsional vibration, caused by interaction between turbine generator and grid, is an important factor in crack failure that occurred in a steam unit in China in 2008 [1]. The cracks locate in the coupling section between low-pressure rotor and generator rotor, which are shown in Fig.…”

Section: Introductionmentioning

confidence: 98%

Coupled Torsional Vibration and Fatigue Damage of Turbine Generator Due to Grid Disturbance

Liu

Jiang

Chen

2014

Journal of Engineering for Gas Turbines and Power

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Crack failures continually occur in shafts of turbine generator, where grid disturbance is an important cau.se. To estimate influences of grid disturbance, coupled torsional vibration and fatigue damage of turbine generator shafts are analyzed in this work, with a case study in a 600MW steam unit in China. The analysis is the following: (i) coupled system is established with generator model and finite element method (FEM)-based shafts model, where the grid disturbance is signified by fluctuation of generator outputs and the shafts model is formed with lumped mass model (LMM) and continuous mass model (CMM), respectively: (ii) fatigue damage is evaluated in the weak location of the shafts through local torque response computation, stress calculation, and fatigue accumulation: and (Hi) failure-prevention approach is formed by solving the inverse problem in fatigue evaluation. The results indicate that the proposed scheme with continuous mass model can acquire more detailed and accurate local responses throughout the shafts compared with the scheme without coupled effects or the scheme using lumped mass model. Using the coupled torsional vibration scheme, fatigue damage caused by grid disturbance is evaluated and failure prevention rule is formed.

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Current Analytical Methods for Qualitative and Quantitative Measurement of d-Xylitol

Cited by 10 publications

References 49 publications

Mathematical modelling and prediction of Congo red adsorption on cherry stones activated carbon

Mathematical modelling and prediction of Congo red adsorption on cherry stones activated carbon

Comportamiento termo fluidodinámico del acero en un molde de colada continua: una revisión

Coupled Torsional Vibration and Fatigue Damage of Turbine Generator Due to Grid Disturbance

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