http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Eco-friendlier and sustainable natural-based additives for poly(vinyl chloride)-based composites
Sofia Marceneiro,Irene Lobo,Isabel Dias,Elizabete de Pinho,Ana M.A. Dias,Hermínio C. de Sousa 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
This work presents novel natural-based and solvent-free additives for poly(vinyl chloride) (PVC), namelycalcium soaps, obtained for the first time from naturally occurring epoxidized soybean and linseed oils(ESO/ELO); and biogenic calcium carbonate, obtained from chicken eggshells (EG) after different acidand/or thermal pre-treatments. Results show that these additives were able to: i) reduce the concentrationof volatile organic compounds released from PVC films, including alcohols, aldehydes, esters andphthalates (97,95,90 and 84% chromatographic peak area reduction, respectively), originating safer materials;ii) improve the long-term thermal stability of PVC-based materials, while maintaining theirmechanical performance and when compared to control samples formulated with a high-performancecommonly employed solvent-based thermal stabilizer. Films formulated with ESO-based calcium soapsand with EG powders treated with acid and thermal treatment (200 C) presented the best performancein terms of heat aging and long-term thermal stability. The former also slightly improved the thermomechanicalproperties of the films indicating that these additives are also working as secondary plasticizersfor PVC. This work gives an important contribution towards the safety and sustainability of highperformancePVC-based materials, by allowing the substitution of commercially available thermal stabilizersby new eco-friendlier and safer alternatives obtained from renewable sources.
Stiffening schemes for CFS built-up I-beams with large global imperfections: Capacity and behaviour
M. Adil Dar,M. Anbarasu,A.R. Dar,Naqeeb Ul Islam,Ahmad Fayeq Ghowsi,Hermes Carvalho 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.4
Cold-formed steel (CFS) sections are thin-walled, therefore, more susceptible to different types of geometric imperfections. Global type of geometric imperfections has a significant impact on the load-carrying capacity of flexural members. This paper reports an experimental study that discusses the influence of global imperfections on the flexural response of CFS built-up I-beams composed of two lipped channels, with simply supported ends, under four-point loading. Global imperfections of magnitude over eight times the maximum permissible ones were induced in the specimens, leading to their distress. Using various simple stiffening schemes, the capacity and stiffness of the distressed specimens were improvised. The performance comparisons were made based on the maximum loads resisted, flexural stiffnesses offered, and failure modes experienced by the specimens. As experimental data on such distressed specimens are currently lacking in the literature, the test results of the present study will provide the necessary data needed by future researchers to numerically extend this study further, which will help in the development of necessary design guidelines for the same. The stiffening schemes significantly improved the structural efficiency of distressed specimens in terms of strength and stiffness, by over 60%. As a result, an effective and time-saving solution to such realistic structural engineering problems is given.
Regulation of mitochondrial fusion and apoptosis by the mitochondrial protein CTMP
Piao, Longzhen,Yang, Keum-Jin,Shin, Sanghee,Shin, Eulsoon,Li, Yuwen,Park, Kyung-Ah,Byun, Hee-Sun,Won, Min-Ho,Kim, Young-Rae,Lee, Hyunji,Hur, Gang-Min,Seok, Jeong-Ho,A. Hermmings, Brian,Park, Jongsun 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10