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741.
Screening of pulp can be expressed as a process where solid contaminants are removed from a pulp slurry without an excessive loss of fibres of acceptable quality. The impurities originate from the feedstock, or they are generated during the transport, handling, storage, or pulping process. The most typical impurities include bark, fibre bundles or shives, knots, plastic, rubber, and sand. Moreover, there are also other objectives for screening, such as the improvement of the pulp quality, savings in bleaching chemical consumption, and protection of process equipment. In industrial applications, pulp screening is typically carried out with more than one screen for a more beneficial screening result. The pulp screening equipment can be divided into different types by the separation technique employed, such as atmospheric or pressurized screens, centrifugal screens, vibrating screens, etc. In addition, there are other types of related equipment that are common in the pulp screening process, such as knotters, refiners, and hydrocyclones. The main objective of this review is to discuss the advantages and disadvantages of modern screening equipment as well as introduce contemporary screening strategies for chemical pulp mills. 相似文献
742.
743.
Dr.-Ing. Frank Holzer Dr. rer. nat. Markus Kraus Dr. rer. nat. habil. Ulf Roland 《化学,工程师,技术》2023,95(11):1834-1843
Fine drying plays a key role for the use and especially the feeding of hydrogen into the natural gas infrastructure. For thermal regeneration of the desiccant, radio waves can be used for direct dielectric heating of the packed bed. Depending on the zeolite used, NaX or NaY, both homogeneous heating and selective heating of the water-laden desiccant beds are possible. Drying reactors were designed and successfully tested based on the technology, so that an operational pressure-resistant prototype is now available for hydrogen drying. 相似文献
744.
Ulf Betke Danielle Chazaro Mendoza Michael Scheffler 《International Journal of Applied Ceramic Technology》2023,20(1):204-212
Open-celled aluminum nitride ceramic foams were prepared by the polymer sponge replication technique involving aqueous dispersions of passivated AlN. The amount of the Y2O3 and Dy2O3 as sintering aid was varied, and the effects on the densification, microstructure formation, phase composition, and finally, the thermal conductivity were investigated. A typical thermal conductivity of 1.1 W m−1 K−1 was determined for foams at a porosity level of 94.3 vol.%, on average. This measured foam thermal conductivity was subsequently modeled using different porosity ↔ thermal conductivity relations considering the different hierarchical levels of porosity in these foams. From these models, the thermal conductivity of the bulk AlN strut material was determined, correlated with the strut microstructure and the phase composition, and compared to literature data. 相似文献
745.
Ilze Lāce Sophia Bazzi Jon Uranga Anastasiya Schirmacher Prof. Dr. Ulf Diederichsen Prof. Dr. Ricardo A. Mata Prof. Dr. Nadja A. Simeth 《Chembiochem : a European journal of chemical biology》2023,24(16):e202300270
Peptide-protein interactions (PPIs) are facilitated by the well-defined three-dimensional structure of bioactive peptides, interesting compounds for the development of new therapeutic agents. Their secondary structure and thus their propensity to engage in PPIs can be influenced by the introduction of peptide staples on the side chains. In particular, light-controlled staples based on azobenzene photoswitches and their structural influence on helical peptides have been studied extensively. In contrast, photolabile staples bearing photocages as a structural key motif, have mainly been used to block supramolecular interactions. Their influence on the secondary structure of the target peptide is under-investigated. Thus, in this study we use a combination of spectroscopic techniques and in silico simulations to systematically study a series of helical peptides with varying length of the photo-labile staple to obtain a detailed insight into the structure-property relationship in such photoresponsive biomolecules. 相似文献