269 research outputs found
Prediction of instantaneous yield of bio-oil in fluidized biomass pyrolysis using long short-term memory network based on computational fluid dynamics data
No full textComputational fluid dynamics (CFD) is an effective tool to investigate biomass fast pyrolysis in fluidized bed reactor for bio-oil production, while it requires huge computational time when optimizing operating conditions or simulating large/industrial units. Machine learning (ML) is a promising approach to achieving both accuracy and efficiency. In this work, a reduced-order model including long short-term memory (LSTM) layer, pooling layer, and fully connected layer was established to predict future mass flow rates by training the historical CFD data. Unsteady mass flow rates, which are normally used to determine product yields, were treated as data of time series in ML. Influencing factors, such as sequence length, number of neurons, learning rate, subsequences order (shuffle or not), number of LSTM layers, and ratio of testing set, were evaluated to obtain their optimal values. The developed LSTM model framework and training process showed good applicability for the dataset of different species and temperatures. Product yields predicted by the derived LSTM were in good agreement with those obtained by CFD, while nearly 30% computational effort was saved. Thus, it is clearly seen that the well-predicted fluctuating characteristics and final product yields are helpful to improve accuracy of process simulation for digitalizing key reactors and building smart factories
Bright AIEgen–Protein Hybrid Nanocomposite for Deep and High‐Resolution In Vivo Two‐Photon Brain Imaging
No full text10.1002/adfm.201902717ADVANCED FUNCTIONAL MATERIALS292
Problema de Basilea
No full textTreball Final de Grau en Matemàtica Computacional. Codi: MT1054. Curs 2024-2025En este documento se detalla el trabajo realizado en la asignatura MT1054 – Trabajo Final de Grado del Grado en Matemática Computacional de la Universidad Jaume I. Estudia el problema de Basilea que plantea la suma exacta de los inversos de los cuadrados de los números naturales. Aunque parece un simple problema de series, en realidad revela una conexión profunda entre los números, las funciones trigonométricas y el análisis complejo. Su solución, descubierta por Euler en el siglo XVIII, mostró que esta suma infnita es igual a π62 , estableciendo un sorprendente vínculo entre aritmética y geometría. En este trabajo exploramos diez demostraciones diferentes de este resultado, lo que permite comprender mejor su esencia matemática y apreciar la riqueza de métodos usados para abordarlo
Multi-bump solutions for a strongly indefinite semilinear Schrodinger equation without symmetry or convexity assumptions
No full textIn this paper, we study the following semilinear Schrodinger equations with periodic coefficient: -Delta u + V(x)u = f(x, u), u is an element of H-1 (R-N). The functional corresponding to this equation possesses strongly indefinite structure. The nonlinear term f(x,t) satisfies some superlinear growth conditions and need not be odd or increasing in t. Using a new variational reduction method and a generalized Morse theory, we proved that this equation has infinitely many geometrically different solutions . Furthermore, if the solutions of this equation under some energy level are isolated, then we can show that this equation has infinitely many m-bump solutions for any positive integer m >= 2. (C) 2007 Elsevier Ltd. All rights reserved.Mathematics, AppliedMathematicsSCI(E)EI0ARTICLE103067-31026
One step hydrothermal synthesis of CeO2-ZrO2 nanocomposites and investigation of the morphological evolution
No full textUniform cauliflower-like and rough nano-spheres of CeO2-ZrO2 composites were synthesized by a facile hydrothermal process using only urea as a mineralizer without any surfactant or template. The structural morphologies were found to vary with the reaction time, calcination temperature and dosage of urea and the urea was verified to play an important role in the determination of the CeO2-ZrO2 composite nanostructures. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and other techniques. On the basis of the characterizations, it was proven that there existed migrations or movements during the hydrothermal process especially with long hydrothermal time and a possible mechanism was proposed which would go through a series of procedures of nucleation, Ostwald ripening and Kirkendall effect to account for the structural dynamics and morphological evolutions. Subsequently, the hybrid Ce0.9Zr0.1O2-GO was reduced by a hydrothermal method, which showed good adsorption for RhB.Natural Science Foundation of China (NSFC) [21471103, 21471100, 51002180, 21001074, 20731002, 20871016, 10876002, 91022006, 20973023]; 111 Project [B07012]; Project of Excellent Talents of Beijing [203135407707]; Scientific Research Base Development Program of the Beijing Municipal Commission of EducationSCI(E)[email protected]; [email protected]
The C-Terminal Arm of the Human Papillomavirus Major Capsid Protein Is Immunogenic and Involved in Virus-Host Interaction
No full textCervical cancer is the second most prevalent malignant tumor among women worldwide. High-risk human papillomaviruses (HPVs) are believed to be the major causative pathogens of mucosal epithelial cancers including cervical cancer. The HPV capsid is made up of 360 copies of major (L1) and 72 copies of minor (L2) capsid proteins. To date, limited high-resolution structural information about the HPV capsid has hindered attempts to understand details concerning the mechanisms by which HPV assembles and infects cells. In this study, we have constructed a pseudo-atomic model of the HPV59 L1-only capsid and demonstrate that the C-terminal armof L1 participates in virus-host interactions. Moreover, when conjugated to a scaffold protein, keyhole limpet hemocyanin (KLH), this arm is immunogenic in vivo. These results provide new insights that will help elucidate HPV biology, and hence pave a way for the design of next-generation HPV vaccines.Chinese government: National Natural Science Foundation [81172885, 81471934, 81371818, 81401669]; National Key Projects in Science and Technology [2012ZX09101316, 2014AA021302]; Fujian Provincial Science Fund [2013J05053]; NIH [R37-GM33050]; University of California San Diego; Agouron FoundationSCI(E)[email protected]; [email protected]
Some existence results for a simplified two fluid system in plasma theory
No full textAbstractIn this paper, we consider a simplified two fluid system in plasma theory. Some multiple existence results for this system are obtained by variational methods and topological degree methods
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