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NUMERICAL SIMULATION OF THE EFFECT OF MALDISTRIBUTION IN A FIXED BED ADSORBER

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Chinese Journal of Chemical Engineering 1997年第4期5卷 22-33页

作者：宁平谷俊杰 Hans-Jrg Bart Department of Chemical Engineering Kunming University of Science and Technology lehrstuhl fur Thermische Verfahrenstechnik Universitat Kaiserslautern

The paper deals with the modeling of the effect of maldistribution in pollutant abatementtrichloroethylene（TCE）concerning low concentration(10-5-10-8kg·m-3)adsorption in an *** a concentration range is rather typical in many an environmental *** andbreakthrough curves for TCE adsorption are obtained both for a commercial activated carbonSorbonorit 4 and a laboratory adsorber of dB/dP=*** two-dimensional nonequilibrium isothermalmodels are developed to describe the mass transfer in the fixed bed taking into account the effect *** is found the simulation results with maldistribution are in very good agreementwith the experimental *** concentration TCE adsorption in a fixed bed of activated carbonis found to be strongly influenced by *** non-uniform distributions of concentrationand loading of the pollutant in the adsorber are predicted by the *** and its ef-fect on the initial breakthrough of TCE in

关键词： adsorption models fixed bed adsorber maldistribution trichloroethylene.

Monolithic membrane reactors based on supported ionic liquid phase(SILP)materials–hydroformylation and water-gas shift case studies

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Green Chemical Engineering 2021年第4期2卷 339-341页

作者： Markus Schorner Patrick Wolf Marco Haumann Friedrich-Alexander-Universitaat Erlangen-Nürnberg(FAU) Lehrstuhl für Chemische Reaktionstechnik(CRT)Egerlandstr.391058ErlangenGermany Forschungszentrum Jülich GmbH Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy(IEK 11)Cauerstr.191058ErlangenGermany

Homogeneous catalysts,usually being active in liquid environment,offer several benefits for highly selective ***,the often tedious product separation and catalyst recycling,requiring energy and chemical input,renders such processes energy ***,process intensification can help to achieve a significant reduction in energy consumption and CO_(2) *** this context,monolithic membrane reactors combining homogeneous catalysis with in-situ product removal are highly *** order to maintain the homogeneous catalyst inside the monolithic structure,the so-called supported ionic liquid phase(SILP)technique is *** such SILP systems,the active catalyst is dissolved in an ionic liquid,which is dispersed as thin film over the large internal surface of a porous support[1].

关键词： ionic catalyst liquid

A New Convergent Explicit Tree-Grid Method for HJB Equations in One Space Dimension

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Numerical Mathematics(Theory,Methods and Applications) 2018年第1期11卷 1-29页

作者： Igor Kossaczky Matthias Ehrhardt Michael Gunther lehrstuhl fur Angewandte Mathematik und Numerische Analysis Fakultat fur Mathematik und NaturwissenschaftenBergische Universitat WuppertalGaußstrasse 2042119 WuppertalGermany

In this work we introduce a new unconditionally convergent explicit Tree-Grid Method for solving stochastic control problems with one space and one time dimension or equivalently,the corresponding Hamilton-Jacobi-Bellman *** prove the convergence of the method and outline the relationships to other numerical *** case of vanishing diffusion is treated by introducing an artificial diffusion *** illustrate the superiority of our method to the standardly used implicit finite difference method on two numerical examples from finance.

关键词： Tree-Grid Method Hamilton-Jacobi-Bellman equation Stochastic control problem

Chloroplast Proteins without Cleavable Transit Peptides： Rare Exceptions or a Major Constituent of the Chloroplast Proteome？

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Molecular Plant 2009年第6期2卷 1325-1335页

作者： Ute Armbruster Alexander Hertle Elina Makarenko Jessica Zuhlke Mathias Pribil Angela Dietzmann Ivo Schliebner Elena Aseeva Elena Fenino Michael Scharfenberg Christian Voigt Dario Leister lehrstuhl fur Botanik Department Biologie I Ludwig-Maximilians-Universit~t MQnchen Menzinger Str. 67 D-80638 Munchen Germany

Most chloroplast proteins （cp proteins） are nucleus-encoded, synthesized on cytosolic ribosomes as precursor proteins containing a presequence （cTP）, and post-translationally imported via the Tic/Toc complex into the organelle, where the cTP is removed. Only a few unambiguous instances of cp proteins that do not require cTPs （non-canonical cp proteins） have been reported so far. However, the survey of data from large-scale proteomic studies presented here suggests that the fraction of such proteins in the total cp proteome might be as large as -30%. To explore this discrepancy, we chose a representative set of 28 putative non-canonical cp proteins, and used in vitro import and Red Fluorescent Protein （RFP）-fusion assays to determine their sub-cellular destinations. Four proteins, including embryo defective 1211, glycolate oxidase 2, protein disulfide isomerase-like protein （PDII）, and a putative glutathione S-transferase, could be unambiguously assigned to the chloroplast. Several others （＇potential cp proteins＇） were found to be imported into chloroplasts in vitro, but failed to localize to the organelle when RFP was fused to their C-terminal ends. Extrapolations suggest that the fraction of cp proteins that enter the inner compartments of the organelle, although they lack a cTP, might be as large as 11.4% of the total cp proteome. Our data also support the idea that cytosolic proteins that associate with the cp outer membrane might account for false positive cp proteins obtained in earlier studies.

关键词： Chloroplast biology mitochondria organelle biogenesis/function protein targeting.

An automated, 0.5 Hz nano-foil target positioning system for intense laser plasma experiments

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High Power Laser Science and Engineering 2017年第2期5卷 52-56页

作者： Ying Gao Jianhui Bin Daniel Haffa Christian Kreuzer Jens Hartmann Martin Speicher Florian H.Lindner Tobias M.Ostermayr Peter Hilz Thomas F.Rsch Sebastian Lehrack Franz Englbrecht Sebastian Seuferling Max Gilljohann Hao Ding Wenjun Ma Katia Parodi Jorg Schreiber lehrstuhl fur Medizinphysik Fakultat fUr PhysikLudwig-Maximilians-Universitat MiinchenAm Coulombwall 1D-85748GarchingGermany Max-Planck-lnstitut fur Quantenoptik D-85748 GarchingGermany peking University Beijing 100871PR China

We report on a target system supporting automated positioning of nano-targets with a precision resolution of 4 μm in three dimensions. It relies on a confocal distance sensor and a microscope. The system has been commissioned to position nanometer targets with 1 Hz repetition rate. Integrating our prototype into the table-top ATLAS 300 TW-laser system at the Laboratory for Extreme Photonics in Garching, we demonstrate the operation of a 0.5 Hz laser-driven proton source with a shot-to-shot variation of the maximum energy about 27% for a level of confidence of 0.95. The reason of laser shooting experiments operated at 0.5 Hz rather than 1 Hz is because the synchronization between the nano-foil target positioning system and the laser trigger needs to improve.

关键词： high intense laser nm thick target positioning system repetition rated laser-driven ion source

On the Circulant and Aperiodic Models of Deconvolution

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Journal of Systems Engineering and Electronics 1995年第1期6卷 16-24页

作者： Zou Mouyan & Rolf Unbehauen Zou Mouyan is on leave from the Institute of Electronics Academia Sinica Beijing China lehrstuhl fur Allgemeine und Theoretische Elektrotechnik Universitat Erlangen-Nurnberg 91058 Erlangen Germany

The popularly used circulant matrix model of deconvolution is mostly heavily ill-posed or singular and it is not suitable to many blind deconvolution problems. The aperiodic matrix model can improve the condition number of deconvolution problems and its accommodation is much wider than the circulant one's. This paper discusses a comparison of the two models including their ill-posedness, the rationality of the approximation by the models, and their computational efficiency. The comparison shows that the aperiodic model is promising in the development of new restoration algorithms.

关键词： circulant matrix model aperiodic model deconvolution

Analytical and Computational Studies of Correlations of Hydrodynamic Fluctuations in Shear Flow

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Communications in Computational Physics 2018年第1期23卷 93-117页

作者： Xin Bian Mingge Deng George Em Karniadakis Division of Applied Mathematics Brown UniversityProvidenceRhode Island 02912USA lehrstuhl fur Aerodynamik und Stromungsmechanik Technische Universitat Munchen85748 GarchingGermany

We study correlations of hydrodynamic fluctuations in shear flow analytically and also by dissipative particle dynamics(DPD)*** hydrodynamic equations are linearized around the macroscopic velocity field and then solved by a perturbation method in Fourier-transformed *** autocorrelation functions(ACFs)fromthe analyticalmethod are comparedwith results obtained fromDPD simulations under the same shear-flow *** to a moderate shear rate,various ACFs from the two approaches agree with each other *** large shear rates,discrepancies between the two methods are observed,hence revealing strong additional coupling between different fluctuating variables,which is not considered in the analytical *** addition,the results at low and moderate shear rates can serve as benchmarks for developing multiscale algorithms for coupling of heterogeneous solvers,such as a hybrid simulation of molecular dynamics and fluctuating hydrodynamics solver,where thermal fluctuations are indispensable.

关键词： Hydrodynamic fluctuations correlation functions dissipative particle dynamics shear flow

Estimation of Pool Boiling Heat Transfer Coefficients of Ethanol-Water Mixtures

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Chinese Journal of Chemical Engineering 1999年第2期7卷 95-103页

作者：谷俊杰 Hans-JrgBart lehrstuhl fur Thermische Verfahrenstechnik Universitat Kaiserslautern67653 KaiserslauternGermany

Based on the analysis of the principles of heat and mass transfer from the liquid bulk to bubble surface during nucleation, a new estimation method to predict the heat transfer of the nucleate pool boiling in binary mixtures is proposed in this paper by using t he heat and mass transfer analogy (Colburn analogy) at the bubble surface transfer layers. With the use of Thome's eaacept of boiling range, an approximate method is derived to vealise the calculation. The peedictbd results by this method are in good agreement with the experimental data from different sources.

关键词：沸点传热系数乙醇-水混合液传质液池沸腾

Efficiency and degradation products elucidation of the photodegradation of mefenpyrdiethyl in water interface using TiO_2 P-25 and Hombikat UV100

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Journal of Environmental Sciences 2012年第9期24卷 1686-1693页

作者： Amina Chnirheb Mourad Harir Basem Kanawati Mohammed El Azzouzi Istvan Gebefgi Philippe Schmitt-Kopplin Department of BioGeoChemistry and Analytik German Research Center for Environmental HealthHelmholtz Center MunichIngoldstdter Landstraβe 1D-85764 NeuherbergGermany University Mohammed V-Agdal Faculty of SciencesAvenue Ibn BatoutaBP 1014 RabatMorocco. lehrstuhl fr chemische-Technische Analyse und chemische Lebensmitteltechnologie Technische Universitt MuenchenWeihenstephaner Steig 2385354 Freising-WeihenstephanGermany

The photodegradation of mefenpyrdiethyl （MFD）, an herbicide safener, was investigated in aqueous suspensions by using Degussa P-25 and Hombikat UV100 titanium oxide under simulated sunlight irradiation. The effects of initial concentration of the herbicide, pH, catalysts and hydrogen peroxide doses as well as their combinations were studied and optimized. Accordingly, the kinetic parameters were determined and the effectiveness of the processes was assessed by calculating the rate constants. A pseudo first-order kinetics was observed. Under experimental conditions, the degradation rate constants were strongly influenced using P-25 and no noticeable effect was observed for Hombikat UV100. DFT calculations with B3LYP/6-311＋G（2d,p）//B3LYP/6-31＋G（d,p） level of theory were performed to check whether significant conformational changes occur when the charge state of the MFD substrate changes and whether these changes could play a role in the dependency of photodegradation rate constant on the studied pH. High resolution mass spectrometry （FT-ICR/MS） was implemented to identify the main degradation products.

关键词： photodegradation mefenpyrdiethyl P-25/Hombikat UV100 kinetic degradation products