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Pixiang Lan,Reza Gheisari,Jacob L. Meyer,Andreas A. Polycarpou 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.6
Surface micro-texturing has been proven an eff ective way to reduce friction and wear for tribological applications. In current work, we propose a low cost hot sintering method to apply micro-texturing on an advanced bearing polymer material. In step 1 of this method, one face of the mold was micro-textured using a micro-casting method, in step 2 the cured Aromatic Thermosetting coPolyester (ATSP) powder was fi lled in the mold. In step 3, the fi lled mold was placed in a hot press for a 2-h hot sintering process, and in step 4, the fi nal textured bulk ATSP was completed after cooling down. Subsequently, the micro-textured ATSP bulk material was machined to 6.35 mm diameter pins for pin-on-disk confi guration tribologcial studies at diff erent speeds with a contact pressure of 9.1 MPa, under boundary lubrication conditions. Compared with plain untextured fl at pins, the micro-textured pins could eff ectively reduce friction at speeds lower than 1.90 m/s: 14% reduction in average. Scanning electron microscopy was utilized for morphological studies of the micro-textured mold, and microtextured ATSP samples, before and after the tribological experiments.
Hamacher, Michael,Stephan, Christian,Hardt, Tanja,Eisenacher, Martin,Henkel, Andreas,Wiltfang, Jens,Jimenez, Connie R.,Park, Young Mok,Marcus, Katrin,Meyer, Helmut E. WILEY-VCH Verlag 2008 Proteomics Vol.8 No.9
<P>What are the current approaches in brain proteomics? Can we combine different, but complementary study designs to obtain better results concerning brain diseases? What are the neuro-hotspots, especially in Korea? These were some of the questions the participants of the 8<SUP>th</SUP> HUPO Brain Proteome Project Workshop tried to answer prior to the 6<SUP>th</SUP> HUPO World Congress in Seoul, Korea. Around 100 scientists came together during the afternoon of 7 October, 2007, to discuss and to catch up on the latest results and strategies concerning Huntington's disease, glioblastoma and standardization.</P>
Morphology and elasticity of polystyrene-block-polyisoprene diblock copolymers in the melt
Taida Gil Haenelt,Prokopios Georgopanos,Clarissa Abetz,Sofia Rangou,Doreen Alisch,Andreas Meyer,Ulrich A. Handge,Volker Abetz 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.3
The influence of morphology on the viscoelastic properties of melts of microphase-separated polystyreneblock-polyisoprene (PS-b-PI) diblock copolymers was investigated in oscillatory shear and creep recoveryexperiments. By means of anionic polymerization, three PS-b-PI diblock copolymers with a narrow molecularweight distribution and different types of morphology (spherical, cylindrical and lamellar microstructure)were prepared. Linear viscoelastic shear oscillations and creep recovery experiments in shearwere performed in order to determine the elastic and viscous properties of the diblock copolymers in themelt at small and large time scales. Our analysis reveals that melts of diblock copolymers are characterizedby a pronounced elastic behavior leading to a relatively large recoverable deformation in creep recoveryexperiments. The elasticity of the diblock copolymers is also revealed by the appearance of the creep-ringingeffect. Morphological investigations were carried out to establish relations between microstructure andmelt elasticity. Since ordering phenomena take place in melts of diblock copolymers until an equilibriummorphology is achieved, the storage modulus G' of diblock copolymer melts increases with time up to asteady-state value.
Morphology and elasticity of polystyrene-block-polyisoprene diblock copolymers in the melt
Haenelt, Taida Gil,Georgopanos, Prokopios,Abetz, Clarissa,Rangou, Sofia,Alisch, Doreen,Meyer, Andreas,Handge, Ulrich A.,Abetz, Volker 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.3
The influence of morphology on the viscoelastic properties of melts of microphase-separated polystyrene-block-polyisoprene (PS-b-PI) diblock copolymers was investigated in oscillatory shear and creep recovery experiments. By means of anionic polymerization, three PS-b-PI diblock copolymers with a narrow molecular weight distribution and different types of morphology (spherical, cylindrical and lamellar microstructure) were prepared. Linear viscoelastic shear oscillations and creep recovery experiments in shear were performed in order to determine the elastic and viscous properties of the diblock copolymers in the melt at small and large time scales. Our analysis reveals that melts of diblock copolymers are characterized by a pronounced elastic behavior leading to a relatively large recoverable deformation in creep recovery experiments. The elasticity of the diblock copolymers is also revealed by the appearance of the creep-ringing effect. Morphological investigations were carried out to establish relations between microstructure and melt elasticity. Since ordering phenomena take place in melts of diblock copolymers until an equilibrium morphology is achieved, the storage modulus G' of diblock copolymer melts increases with time up to a steady-state value.
Isabel Siow,Benjamin Y.Q. Tan,Keng Siang Lee,Natalie Ong,Emma Toh,Anil Gopinathan,Cunli Yang,Pervinder Bhogal,Erika Lam,Oliver Spooner,Lukas Meyer,Jens Fiehler,Panagiotis Papanagiotou,Andreas Kastrup 대한뇌졸중학회 2022 Journal of stroke Vol.24 No.1
Background and Purpose Mechanical thrombectomy (MT) is an effective treatment for patients with basilar artery occlusion (BAO) acute ischemic stroke. It remains unclear whether bridging intravenous thrombolysis (IVT) prior to MT confers any benefit. This study compared the outcomes of acute BAO patients who were treated with direct MT versus combined IVT plus MT. Methods This multicenter retrospective cohort study included patients who were treated for acute BAO from eight comprehensive stroke centers between January 2015 and December 2019. Patients received direct MT or combined bridging IVT plus MT. Primary outcome was favorable functional outcome defined as modified Rankin Scale 0–3 measured at 90 days. Secondary outcome measures included mortality and symptomatic intracranial hemorrhage (sICH). Results Among 322 patients, 127 (39.4%) patients underwent bridging IVT followed by MT and 195 (60.6%) underwent direct MT. The mean±standard deviation age was 67.5±14.1 years, 64.0% were male and median National Institutes of Health Stroke Scale was 16 (interquartile range, 8 to 25). At 90-day, the rate of favorable functional outcome was similar between the bridging IVT and direct MT groups (39.4% vs. 34.4%, P=0.361). On multivariable analyses, bridging IVT was not associated with favorable functional outcome, mortality or sICH. In subgroup analyses, patients with underlying atherosclerosis treated with bridging IVT compared to direct MT had a higher rate of favorable functional outcome at 90 days (37.2% vs. 15.5%, P=0.013). Conclusions Functional outcomes were similar in BAO patients treated with bridging IVT versus direct MT. In the subgroup of patients with underlying large-artery atherosclerosis stroke mechanism, bridging IVT may potentially confer benefit and this warrants further investigation.