The objective of this work is to develop new biosourced insulating composites from rice husks and wood chips that can be used in the building sector. It appears from the properties of the precursors that rice chips an...The objective of this work is to develop new biosourced insulating composites from rice husks and wood chips that can be used in the building sector. It appears from the properties of the precursors that rice chips and husks are materials which can have good thermal conductivity and therefore the combination of these precursors could make it possible to obtain panels with good insulating properties. With regard to environmental and climatic constraints, the composite panels formulated at various rates were tested and the physico-mechanical and thermal properties showed that it was essential to add a crosslinker in order to increase certain solicitation. an incorporation rate of 12% to 30% made it possible to obtain panels with low thermal conductivity, a low surface water absorption capacity and which gives the composite good thermal insulation and will find many applications in the construction and real estate sector. Finally, new solutions to improve the fire reaction of the insulation panels are tested which allows to identify suitable solutions for the developed composites. In view of the flame tests, the panels obtained are good and can effectively combat fire safety in public buildings.展开更多
为探究脱病毒种苗对果蔗的影响,本研究以广东黄皮果蔗为试验材料,进行了自留种、脱毒一代、脱毒二代果蔗种苗的田间性状和果汁品质的比较研究。结果表明,3种材料中,脱毒二代果蔗的田间生长状态最佳,与自留种和脱毒一代相比,其地上株高...为探究脱病毒种苗对果蔗的影响,本研究以广东黄皮果蔗为试验材料,进行了自留种、脱毒一代、脱毒二代果蔗种苗的田间性状和果汁品质的比较研究。结果表明,3种材料中,脱毒二代果蔗的田间生长状态最佳,与自留种和脱毒一代相比,其地上株高分别提高9.08%、5.80%(其中可食部分高度分别提高13.64%、7.19%),茎粗分别提高13.98%、9.71%,产量分别提高47.76%、63.72%(达到159.5 t hm^(-2)),出汁率分别提高3.64%、9.17%,蔗汁的总糖含量分别下降10.14%、12.73%;脱毒对果蔗蔗汁的密度、锤度和纤维含量无显著影响;脱毒苗第一代果蔗与自留种的产量和蔗汁品质无显著差异,脱毒组培苗作为第一代种苗可用于繁育脱毒果蔗种茎,3—4月份适宜移栽。因此,相对于一代组培苗,采用脱毒第二代种苗(脱毒第一代种苗种植收获的果蔗种茎)进行商品蔗种植效果更好,可促进果蔗田间生长,显著提高果蔗的产量。展开更多
The efficiency and selectivity of chlorimuron-ethyl （107 g/kg） associated with metribuzin （643 g/kg）, against weeds which causes big damages to sugar cane, have been studied on the sugar cane field of Beregadougou...The efficiency and selectivity of chlorimuron-ethyl （107 g/kg） associated with metribuzin （643 g/kg）, against weeds which causes big damages to sugar cane, have been studied on the sugar cane field of Beregadougou. The experimental design was a Latin rectangle with eight treatments in four replications including an untreated control, manual weeding, a control product （Trifloxysulfuron-sdium 1.85% ＋ Ametryn 73.15%） and five rates of chlorimuron-ethyl associated with metribuzin. Weeds counting and weighing their dry biomass have been done using 0.25 m2 quadrants to determine their biological efficiencies. The soil nitrogen nitrate and assimilable phosphorus contents were evaluated on a spectrophotometer, those of available potassium on a flame photometer. The biological efficiency coefficients of this herbicide, varied from 12.41% to 100%, according to their dry biomass. High rates, phytotoxics, showed the best coefficients. At the sugar cane complete maturation, the higher rates of imposter led to an accumulation of nitrogen nitrate content and lower available phosphorus and potassium contents, compared to the untreated control. The rate of 1.20 kg/ha became the dose to apply against weeds and less toxic to the soil.展开更多
文摘The objective of this work is to develop new biosourced insulating composites from rice husks and wood chips that can be used in the building sector. It appears from the properties of the precursors that rice chips and husks are materials which can have good thermal conductivity and therefore the combination of these precursors could make it possible to obtain panels with good insulating properties. With regard to environmental and climatic constraints, the composite panels formulated at various rates were tested and the physico-mechanical and thermal properties showed that it was essential to add a crosslinker in order to increase certain solicitation. an incorporation rate of 12% to 30% made it possible to obtain panels with low thermal conductivity, a low surface water absorption capacity and which gives the composite good thermal insulation and will find many applications in the construction and real estate sector. Finally, new solutions to improve the fire reaction of the insulation panels are tested which allows to identify suitable solutions for the developed composites. In view of the flame tests, the panels obtained are good and can effectively combat fire safety in public buildings.
文摘为探究脱病毒种苗对果蔗的影响,本研究以广东黄皮果蔗为试验材料,进行了自留种、脱毒一代、脱毒二代果蔗种苗的田间性状和果汁品质的比较研究。结果表明,3种材料中,脱毒二代果蔗的田间生长状态最佳,与自留种和脱毒一代相比,其地上株高分别提高9.08%、5.80%(其中可食部分高度分别提高13.64%、7.19%),茎粗分别提高13.98%、9.71%,产量分别提高47.76%、63.72%(达到159.5 t hm^(-2)),出汁率分别提高3.64%、9.17%,蔗汁的总糖含量分别下降10.14%、12.73%;脱毒对果蔗蔗汁的密度、锤度和纤维含量无显著影响;脱毒苗第一代果蔗与自留种的产量和蔗汁品质无显著差异,脱毒组培苗作为第一代种苗可用于繁育脱毒果蔗种茎,3—4月份适宜移栽。因此,相对于一代组培苗,采用脱毒第二代种苗(脱毒第一代种苗种植收获的果蔗种茎)进行商品蔗种植效果更好,可促进果蔗田间生长,显著提高果蔗的产量。
文摘The efficiency and selectivity of chlorimuron-ethyl （107 g/kg） associated with metribuzin （643 g/kg）, against weeds which causes big damages to sugar cane, have been studied on the sugar cane field of Beregadougou. The experimental design was a Latin rectangle with eight treatments in four replications including an untreated control, manual weeding, a control product （Trifloxysulfuron-sdium 1.85% ＋ Ametryn 73.15%） and five rates of chlorimuron-ethyl associated with metribuzin. Weeds counting and weighing their dry biomass have been done using 0.25 m2 quadrants to determine their biological efficiencies. The soil nitrogen nitrate and assimilable phosphorus contents were evaluated on a spectrophotometer, those of available potassium on a flame photometer. The biological efficiency coefficients of this herbicide, varied from 12.41% to 100%, according to their dry biomass. High rates, phytotoxics, showed the best coefficients. At the sugar cane complete maturation, the higher rates of imposter led to an accumulation of nitrogen nitrate content and lower available phosphorus and potassium contents, compared to the untreated control. The rate of 1.20 kg/ha became the dose to apply against weeds and less toxic to the soil.
