Bamboo based biocomposites were made with woven bamboo mats and epoxy/unsaturated polyester (UPE) resins. The effects of pre-impregnation on the mechanical and water resistant properties of composites were studied. An...Bamboo based biocomposites were made with woven bamboo mats and epoxy/unsaturated polyester (UPE) resins. The effects of pre-impregnation on the mechanical and water resistant properties of composites were studied. An alkaline treatment was used to enhance the fiber wetting so as to achieve complete pre-impregnation with epoxy and unsaturated polyester resins. A combined treatment of alkali and dilute epoxy/polyester gives the best result. Bending strength, modulus of elasticity, tensile strength, tensile modulus, impact strength, water absorption were evaluated and compared for all composites. Scanning electron microscopy (SEM) studies of the composites tensile fracture surface also indicated that there is an improved adhesion between fiber and matrix. The mechanical as well as water resistant properties of the biocomposites improved after pre-impregnation treatment.展开更多
Objective:To evaluate the contribution of poses screen pre-impregnated(PSP) installed at openings and eaves of dwellings in the reduction of malaria transmission in the commune of Aguegues in Benin.Methods:The PSP wer...Objective:To evaluate the contribution of poses screen pre-impregnated(PSP) installed at openings and eaves of dwellings in the reduction of malaria transmission in the commune of Aguegues in Benin.Methods:The PSP were manufactured from preimpregnated Olyset Net.They were installed at windows,eaves and doors of 70 dwellings.320 children aged 6-59 months were treated and 311 children were recruited in the control zone.Variables measured are:plasmodic index(IP),gametoeyte index,parasite density(PD),fever,hemoglobin,anemia. Results:The global IP was 16.62%with PSP and 72.20%without PSP.Gametoeyte index did not differ significantly between the treated zone(27.8) and the control zone(29.1).The total geometric mean of DP was 309 in the treated zone and 600 in the control zone.Hemoglobin level is 8.7 in the control zone and 9.5 in the treated zone.We noted a predominance of anemia in the control zone compared to the treated zone.Conclusions:The PSP have contributed to a significant reduction in morbidity in the commune of Aguegues.展开更多
文摘Bamboo based biocomposites were made with woven bamboo mats and epoxy/unsaturated polyester (UPE) resins. The effects of pre-impregnation on the mechanical and water resistant properties of composites were studied. An alkaline treatment was used to enhance the fiber wetting so as to achieve complete pre-impregnation with epoxy and unsaturated polyester resins. A combined treatment of alkali and dilute epoxy/polyester gives the best result. Bending strength, modulus of elasticity, tensile strength, tensile modulus, impact strength, water absorption were evaluated and compared for all composites. Scanning electron microscopy (SEM) studies of the composites tensile fracture surface also indicated that there is an improved adhesion between fiber and matrix. The mechanical as well as water resistant properties of the biocomposites improved after pre-impregnation treatment.
基金supported by the Ministry of Higher Education and Scientific Research of the Government of Benin
文摘Objective:To evaluate the contribution of poses screen pre-impregnated(PSP) installed at openings and eaves of dwellings in the reduction of malaria transmission in the commune of Aguegues in Benin.Methods:The PSP were manufactured from preimpregnated Olyset Net.They were installed at windows,eaves and doors of 70 dwellings.320 children aged 6-59 months were treated and 311 children were recruited in the control zone.Variables measured are:plasmodic index(IP),gametoeyte index,parasite density(PD),fever,hemoglobin,anemia. Results:The global IP was 16.62%with PSP and 72.20%without PSP.Gametoeyte index did not differ significantly between the treated zone(27.8) and the control zone(29.1).The total geometric mean of DP was 309 in the treated zone and 600 in the control zone.Hemoglobin level is 8.7 in the control zone and 9.5 in the treated zone.We noted a predominance of anemia in the control zone compared to the treated zone.Conclusions:The PSP have contributed to a significant reduction in morbidity in the commune of Aguegues.
