Concept

Countercurrent exchange

Publications associées (80)

Process Integration Methodology

Process integration methods aim at identifying options for heat recovery and optimal energy conversion in industrial processes. For the heat cascade, it is assumed that any heat exchange between cold and hot streams is possible, but due to industrial const ...

2010

Second Harmonic Detection of Spin-Dependent Transport in Magnetic Nanostructures

Jean-Philippe Ansermet, Simon Granville

Detection of the second harmonic response of magnetic nanostructures to an ac current is shown to be a very sensitive probe of the magnetization reversal process. A temperature oscillation is obtained by Joule heating instead of using a laser as the heat s ...

2010

Flow exchange between a channel and a rectangular embayment equipped with a diverting structure

Anton Schleiss, Jean-Marc Ribi

In the framework of a research project focusing on mitigation measures for hydropeaking, a lateral embayment in riverbank is studied as a fish shelter. With the goal to find attractive configurations of shelter, systematic experiments with wild juvenile br ...

Ed. Dittrich, Koll, Aeberle & Geisenhainer (eds)2010

Transport of nonsorbing solutes in a streambed with periodic bedforms

David Andrew Barry

Previous studies of hyporheic zone focused largely on the net mass transfer of solutes between stream and streambed. Solute transport within the bed has attracted less attention. In this study, we combined flume experiments and numerical simulations to exa ...

Elsevier2010

Lanthanide chelates of (bis)-hydroxymethyl-substituted DTTA with potential application as contrast agents in magnetic resonance imaging

Lothar Helm

A novel bis-hydroxymethyl-substituted DTTA chelator N¢-Bz-C4,4¢-(CH2OH)2-DTTA (1) and its DTPA analogue C4,4¢-(CH2OH)2-DTPA (2) were synthesized and characterized. A variable-temperature 1H NMR spectroscopy study of the solution dynamics of their diamagnet ...

2009

Heat Exchanger Network (HEN) costs and performances estimation for multi-period operation

François Maréchal, Francesca Palazzi, Raffaele Bolliger

This paper addresses the problem of modeling and estimating the cost of the heat exchanger network (HEN) in multi-period operation using pinch technique concepts. The developed method improves the vertical heat exchanges technique originally proposed by Ah ...

2008

Positively Charged GdIII Cryptates: Slow, Associative Water Exchange

André Merbach, Lothar Helm, Eva Jakab Toth

A combined variable-temp. and multiple field 17O NMR, EPR and NMRD study was performed for the 1st time on Gd(III) complexes of cryptand ligands, L1 and L2, where L1 contains three 2,2'-bipyridine units ([bpy.bpy.bpy]) and L2 is the disubstituted Me ester ...

2006

Water-Exchange Study Revealed Unexpected Substitution Behavior of [(CO)2(NO)Re(H2O)3]2+ in Aqueous Media

André Merbach, Lothar Helm, Pascal Grundler, Marie-Line Lehaire

The pH-dependent water-exchange rates of [(CO)2(NO)Re(H2Ocis)2(H2Otrans)]2+ (1) in aq. media were investigated by means of 17O NMR spectroscopy at 298 K. Because of the low pKa value found for 1 (pKa = 1.4 ± 0.3), the water-exchange rate const. kobsH2Otran ...

2006

Advanced Power Plant Design Methodology using Process Integration and Multi-Objective Thermo-Economic Optimisation

François Maréchal, Daniel Favrat, Raffaele Bolliger

Thermo-economic modelling techniques are well known techniques to optimise power plant designs. These methods are usually based on the definition of a superstructure that includes the major options of the design. If this approach has proved to be appropria ...

2005

Rotational Dynamics Account for pH-Dependent Relaxivities of PAMAM Dendrimeric, Gd-Based Potential MRI Contrast Agents

André Merbach, Eva Jakab Toth, Sabrina Laus

The EPTPA5- chelate, which ensures fast water exchange in GdIII complexes, has been coupled to three different generations (5, 7, and 9) of polyamidoamine (PAMAM) dendrimers through benzylthiourea linkages (H5EPTPA=ethylenepropylenetriamine-N,N,N,N,N-penta ...

2005

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