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Mechanical & Interfacial Properties of Bamboo Lamella-PP Composites – Effect of Lamella Treatment
Pierre Ovlaque,Marie Bayart,Patrice Cousin,Julien Durand,Grégoire Mercusot,Saïd Elkoun,Mathieu Robert 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
This study aims at measuring the interfacial properties of natural fibers in polypropylene composites by the meanof direct methods of characterization. Bamboo lamellae (BL) and polypropylene (PP) were used to produce laminatedcomposites with continuous and homogenous interfaces. This research also focuses on the effect of maleic anhydride-graftedPP (MAPP) on the improvement of the PP/BL composites interfacial properties, which were measured by the means of thedouble cantilever beam (DCB), end-notched flexure (ENF) and short beam shear (SBS) methods. Flexural properties of thedifferent composites were also determined using the three-point bending and single cantilever modes by dynamic mechanicalanalysis (DMA). The retention rates (Rr) of mechanical and interfacial properties were calculated on samples aged in hotwater. Results reveal that MAPP induced a significant increase in flexural properties. This is undeniably related to anenhancement of affinity between PP and BL that was confirmed by DCB, ENF and SBS tests results. It was also highlightedthat MAPP tends to limit degradation of the composite interfacial properties with,for instance, a critical fracture toughness(mode I) Rr of 97 % for MAPP coated composites against 56 % for the untreated composites.
Sagittal Balance Correction Following Lumbar Interbody Fusion: A Comparison of the Three Approaches
Pierre-Olivier Champagne,Camille Walsh,Jocelyne Diabira,Marie-Élaine Plante,Zhi Wang,Ghassan Boubez,Daniel Shedid 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.3
Study Design: Retrospective cohort study. Purpose: The objective of this study was to compare three widely used interbody fusion approaches in regard to their ability to correct sagittal balance, including pelvic parameters. Overview of Literature: Restoration of sagittal balance in lumbar spine surgery is associated with better postoperative outcomes. Various interbody fusion techniques can help to correct sagittal balance, with no clear consensus on which technique offers the best correction. Methods: The charts and imaging of patients who have undergone surgery through either open transforaminal lumbar interbody fusion (TLIF), minimally invasive TLIF (MIS TLIF), or oblique lumbar interbody fusion (OLIF) were retrospectively reviewed. The following sagittal balance parameters were measured pre- and postoperatively: segmental lordosis, lumbar lordosis, disk height, pelvic tilt, and pelvic incidence. Data on postoperative complications were gathered. Results: Only OLIF managed to significantly improve segmental lordosis (4.4°, p<0.001) and lumbar lordosis (4.8°, p=0.049). All approaches significantly augmented disk height, with OLIF having the greatest effect (3.7°, p<0.001). No approaches were shown to significantly correct pelvic tilt. Pelvic incidence remained unchanged in all approaches. Open TLIF was the only approach with a higher rate of postoperative complications (33%, p=0.009). Conclusions: The OLIF approach might offer greater correction of sagittal balance over open and MIS TLIF, mainly in regard to segmental lordosis, lumbar lordosis, and disk height. MIS TLIF, although offering more limited access than open TLIF, was not inferior to open TLIF in regard to sagittal balance correction. A higher rate of complications was shown for open TLIF than the other approaches, possibly due to its more invasive nature.
Lamin A/C mutations associated with familial and sporadiccases of dilated cardiomyopathy in Koreans
송규영,Marie-Pierre Dub?,임지영,황일선,이인철,김재종 생화학분자생물학회 2007 Experimental and molecular medicine Vol.39 No.1
Dilated cardiomyopathy (DCM) is characterized by cardiac dilation and systo lic dysfunction. So far sixteen genes have been shown to cause autosomal dominant familial dilated cardiomyopathy (FDC). We identified a large Korean family from the Jeju island showing a clear Mendelian inheritance of FDC. A genomewide linkage scan at 9 cM marker density identified a peak multipoint LOD score of 2.82 at D1S195. Haplotyping of the region with 15 additional markers defined a candidate interval that included a known candidate gene en coding the lamin A/C (LMNA). Sequencing of the LMNA exons revealed one missense mutation at C568T (Arg190Trp) in the -helical rod domain of the LMNAgating with FDC with conduction-system disease. The same mutation was found in patients of another Korean family with FDC without conduction-system disease. Upon screening 14 sporadic DCM cases, we found three LMNA mutations including a case having a previously described (Glu161Lys) mutation and two having novel mutations (Glu53Val and Glu186Lys). Our results sugest that variable genotypes of laminopathy ar e implicated in not only familial but also considerable proportion of sporadic DCM.
Gaigeot, Marie-Pierre,Cimas, Alvaro,Seydou, Mahamadou,Kim, Ju-Young,Lee, Sungyul,Schermann, Jean-Pierre American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.51
<P>The role of water in the structural change of nicotine from its inactive form in the gas phase to its bioactive form in aqueous solution has been investigated by two complementary theoretical approaches, i.e., geometry optimizations and molecular dynamics. Structures of the lowest-energy nicotineH(+)-(H(2)O)(n) complexes protonated either on the pyridine (inactive form) or pyrrolidine (active form) ring have been calculated, as well as the free-energy barriers for the proton-transfer tautomerization between the two cycles. These structures show chains of 2-4 water molecules bridging the two protonation sites. The room-temperature free-energy barrier to tautomerization along the minimum-energy path from the pyridine to the pyrrolidine cycle drops rapidly when the number of water molecules increases from 0 to 4, but still remains rather high (16 kJ/mol with four water molecules), indicating that the proton transfer is a rather difficult and rare event. We compare results obtained through this explicit water molecule approach to those obtained by means of continuum methods. Car-Parrinello molecular dynamics (CPMD) simulations of the proton-transfer process in bulk with explicit water molecules have been conducted at room temperature. No spontaneous proton transfers have been observed during the dynamics, and biased CPMD simulations have therefore been performed in order to measure the free-energy profile of the proton transfer in the aqueous phase and to reveal the proton-transfer mechanism through water bridges. The MD bias involves pulling the proton from the pyridine ring to the surrounding bulk. Dynamics show that this triggers the tautomerization toward the pyrrolidine ring, proceeding without energy barrier. The proton transfer is extremely fast, and protonation of the pyrrolidine ring was achieved within 0.5 ps. CPMD simulations confirmed the pivotal role played by the water molecules that bridge the two protonation sites of nicotine within the bulk of the surrounding water.</P>
OpenFOAM을 활용한 포말대 이중 댐-붕괴 수치모형실험
옥주희,김열우,Marie-Pierre C. Delisle 한국수자원학회 2023 한국수자원학회논문집 Vol.56 No.10
본 연구는 포말대 흐름의 난류특성에 대한 이해를 목표로 한다. 포말대 흐름을 재현하기 위해 이중 댐-붕괴 파랑생성법이 제시되었다. 기존 단일 댐-붕괴 실험과 비교하여 이중 댐-붕괴 실험은 두 개의 수문의 개방 시간을 조절하여 처오름과 처내림의 다양한 상호작용을 구현할 수 있다. 수치모형으로는 OpenFOAM의 overInterDyMFoam이 활용되었다. overInterDyMFoam은 밀도가 다른 두 유체(i.e., 공기, 물)의 경계면 추적기법과 동격자 및 중첩 격자 기법을 결합한 모형이다. 질량보존 및 운동량 방정식으로는 난류모형이 결합된 이차원 Reynolds-Averaged Navier-Stokes 모형이 채택되었다. 수치모형실험 결과는 수리모형실험의 수심 및 흐름 방향 유속 시계열과 비교하여 정확도가 검증되었다. 난류 운동 에너지 분포특성을 확인하여 각 흐름 단계(i.e., 처오름, 처내림, 흐름의 상호작용)의 난류 진화 특성을 고찰하였다. This study aims to provide a better understanding of the turbulent flow characteristics in swash zone. A double dam-break method is employed to generate the swash zone flow. Comparing with the conventional single dam-break method, a delay between two gate opening can be controlled to reproduce various interactions between uprush and backwash. For numerical simulations, overInterDyMFoam based on OpenFOAM is adopted. Using overInterDyMFoam, interface between two immiscible fluids having different densities (i.e., air and water phases) can be tracked in a moving mesh with multiple layers. Two-dimensional Reynolds-Averaged Navier-Stokes equations are solved with a standard turbulence model for momentum and continuity. Numerical model results are validated with laboratory experiment data for the time series of water depth and streamwise velocity. Turbulent kinetic energy distribution is further investigated to identify the turbulence evolution for each flow regime (i.e., uprush, backwash, and swash-swash interaction).
SYNTHESIS AND MICROSTRUCTURE OF A NOVEL TiO2 AEROGEL–TiO2
YOSHIKAZU SUZUKI,MARIE-HÉLÈNE BERGER,DANIELA D'ELIA,PIERRE ILBIZIAN,CHRISTIAN BEAUGER,ARNAUD RIGACCI,JEAN-FRANÇOIS HOCHEPIED,PATRICK ACHARD 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.5
TiO2 aerogel–10 mol% TiO2 nanowire composite was prepared by a sol–gel technique with the addition of TiO2 nanowires to TiO2 sol, followed by supercritical drying in CO2. TiO2 nanowires (anatase with minor rutile phases) as dispersoid were prepared by a hydrothermal process followed by calcination in air at 600°C. The TiO2 nanowires were dispersed in a 2-propanol/H2O/HNO3 solution, and the mixture was added drop by drop to a tetrabutyl orthotitanate [i.e. Ti (IV) n-butoxide] solution in 2-propanol. After gelation, the TiO2 alcogel–TiO2 nanowire composite was dried in supercritical CO2 to obtain the final, TiO2 aerogel–TiO2 nanowire composite. TEM analysis revealed that a unique "nanowire network" structure was formed withinthe mesoporous aerogel matrix. The aerogel–TiO2 nanowire composite had a relatively large surface area 427 m2/g, with mesopores ~ 16 nm in diameter and a pore of volume of 1.63 cm3/g.