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Ohne Zusammenfassung 相似文献
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This mini review gives an overview of the synthesis of polyurethanes and polyesters with pendant hydroxyl groups performed mainly in our group. Significant for the synthesis of most of these polymers with hydroxyl‐functional side groups is that no protection groups are needed. This is realised either by generating the OH group during polymer synthesis—demonstrated by the preparation of hydroxyl‐functional polyurethanes from dicarbonate monomers and diamines—or by using catalysts which discriminate between primary and secondary OH groups—demonstrated by the synthesis of hydroxyl‐functional polyesters based on malic acid using scandium triflate as catalyst. In addition, the potential of carbonate couplers for the synthesis of multifunctional polyurethane is presented. The application of such multifunctional polyurethanes as antimicrobial polymers and coatings is briefly discussed. Copyright © 2012 Society of Chemical Industry 相似文献
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Scheidler Stefan Anders Birte Regli Christian Bolay Stephan Huggenberger Peter 《Grundwasser》2019,24(4):277-286
Grundwasser - Topographically induced Alpine regional groundwater flow systems below the unconsolidated valley fillings constitute a substantial unused geothermal resource. Within the... 相似文献
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Microalloyed steels for forging applications have been newly developed in order to increase strength and toughness properties which thereby give the possibility for light weight constructions.The properties of these steels are set up by a controlled cooling directly from the forging heat without an additional heat treatment.This aim can be achieved on the one hand by a further development of precipitation hardening ferritic pearlitic steels (AFP-steel) due to an extended use of microalloying elements (AFP-M steel) and on the other hand by microalloyed steels which employ a bainitic microstructure (HDB steel).To adjust the targeted microstructure the temperature control has to be assured down to approx.500℃ for the AFP-M steels and down to approx.300℃ for the HDB steels. 相似文献
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Soren Damgaard-Larsen Kirsten Ottar Jensen Ebba Lund Birte Nissen 《Water research》1977,11(6):503-508
Coxsackievirus and tritiated water were added to municipal sludges which were placed on lysimeters containing sandy soil or clay soil. It took 23 weeks during a normal Danish winter to inactivate virus from an initial 106tcid50/g sludge to a not demonstrable level. Irrespective of sludge and soil type no virus was demonstrated in the leachate water. The rainfall during December–May was 300 mm. 相似文献
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Nesbitt E Schmidt-Trucksäss A Il'yasov KA Weber H Huonker M Laubenberger J Keul J Hennig J Langer M 《Magma (New York, N.Y.)》2000,10(1):27-34
The purpose of this study was to scrutinize the ability of magnetic resonance imaging (MRI)-performed measurements to compare
arterial flow patterns in patients with peripheral arterial occlusive disease (PAOD), healthy volunteers (HV) and endurance
athletes (EA). MRI blood flow data were partially repeated with Doppler ultrasound (DUS) with a view to a methodical comparison.
Additionally, pulse wave velocity was assessed with the MUFF technique. For this purpose, MRI-performed flow measurements
were performed in the common femoral artery in 21 patients with PAOD, in 34 HV and in 12 EA. The analysis included maximum
flow velocities (MFV), velocity/time profile (VTP), pulse wave velocity (V
pulse), and vessel diameter (VD). In addition, MFV and VD were observed by DUS in most individuals. The results revealed a significant
change regarding arterial blood flow characteristics in patients compared with HV and EA, with respect to the span between
the peak positive and negative blood flow velocity in the femoral artery. The pulse wave velocity in patients was markedly
elevated compared with healthy individuals. Furthermore, a complete, characteristic change in the VTP could be observed in
patients. The methodical comparison between DUS and MRI showed a good correlation. Multi-slice Fourier flow data have indicated
markedly increased pulse wave velocity in PAOD patients. Changes in the arterial blood flow can be clearly observed with MRI.
In the future, this might offer a noninvasive possibility not only for the evaluation of the stage of the disease, but also
for the detection of early, pre-clinical stages of atherosclerosis.
This work was presented at the 1997 ISMRM Meeting, Vancouver, Canada and at the 14th Annual ESMRMB Meeting, Brussels, Belgium,
1997. 相似文献