在应用抗骨吸收药物,如双膦酸盐和地舒单抗,以及血管生成抑制剂的患者群体中,进行相关口腔疾病的治疗可能会诱发药物相关性颌骨坏死(medication-related osteonecrosis of the jaw,MRONJ)。然而,MRONJ的确切机制尚不清楚,尽管大量研究...在应用抗骨吸收药物,如双膦酸盐和地舒单抗,以及血管生成抑制剂的患者群体中,进行相关口腔疾病的治疗可能会诱发药物相关性颌骨坏死(medication-related osteonecrosis of the jaw,MRONJ)。然而,MRONJ的确切机制尚不清楚,尽管大量研究已经创建了临床治疗数据库,但明确的治疗策略尚未制定。本研究通过文献回顾,对MRONJ的定义、病因、分期、危险因素、治疗和预防进行了相关讨论,为口腔临床工作提供参考。展开更多
CFRP/2A12 laminated structure due to the large difference in the properties of the material,very easy to produce defects when making holes,affecting the quality of the workpiece,and thus the connection performance of ...CFRP/2A12 laminated structure due to the large difference in the properties of the material,very easy to produce defects when making holes,affecting the quality of the workpiece,and thus the connection performance of the two materials.The root cause of the poor quality of CFRP/2A12 laminated structure is the difference in material removal mechanism and the complexity of tool processing conditions.Therefore,this paper analyzes the effects of different process parameters on the pore-forming quality of the laminated material through experiments,reveals the change law of cutting force of the CFRP/2A12 laminated structure,and determines the optimal process parameters.The results show:The axial force generated by the drill when it enters half of CFRP is the largest,which is much larger than the axial force generated when drilling 2A12 aluminum alloy plate,and the thickness of the laminated metal plate is great for drilling.The hole formation sequence of the laminated structure has a significant effect on the cutting force.The axial force when the laminated sequence is CFRP/2A12 is smaller than when the laminated sequence is 2A12/CFRP.展开更多
Bamboo deterioration caused by light becomes a significant problem as application of bamboo extends from indoor to outdoor.The color and roughness of bamboo are two important exterior performances.This study focused o...Bamboo deterioration caused by light becomes a significant problem as application of bamboo extends from indoor to outdoor.The color and roughness of bamboo are two important exterior performances.This study focused on UV resistant nano composites coatings for exterior use and what aimed to find a formulation which could enhance the durability of bamboo.Four kinds of film-forming materials and four kinds of nano particles were used to improve bamboo exterior performance.The color and roughness of nano composites coatings were measured during accelerated weathering.Artificial aging time was 174 h at the temperature of 50 ℃.The experiment showed nanocomposites coatings had significant improvement in UV-shielding and nearly all the samples presented a darkening tendency in ΔL* and increasing tendency in Δa*,ΔE* and ΔRa.The orthogonal experiment obtained the least change in color and Ra which could be achieved with nano composites coating made by melamine resin and TiO2 when a* was considered as an important index.Film-forming material was the only factor which had significant influence on color and roughness when a* was not considered as important index,then melamine resin was the best choice.展开更多
文摘在应用抗骨吸收药物,如双膦酸盐和地舒单抗,以及血管生成抑制剂的患者群体中,进行相关口腔疾病的治疗可能会诱发药物相关性颌骨坏死(medication-related osteonecrosis of the jaw,MRONJ)。然而,MRONJ的确切机制尚不清楚,尽管大量研究已经创建了临床治疗数据库,但明确的治疗策略尚未制定。本研究通过文献回顾,对MRONJ的定义、病因、分期、危险因素、治疗和预防进行了相关讨论,为口腔临床工作提供参考。
文摘CFRP/2A12 laminated structure due to the large difference in the properties of the material,very easy to produce defects when making holes,affecting the quality of the workpiece,and thus the connection performance of the two materials.The root cause of the poor quality of CFRP/2A12 laminated structure is the difference in material removal mechanism and the complexity of tool processing conditions.Therefore,this paper analyzes the effects of different process parameters on the pore-forming quality of the laminated material through experiments,reveals the change law of cutting force of the CFRP/2A12 laminated structure,and determines the optimal process parameters.The results show:The axial force generated by the drill when it enters half of CFRP is the largest,which is much larger than the axial force generated when drilling 2A12 aluminum alloy plate,and the thickness of the laminated metal plate is great for drilling.The hole formation sequence of the laminated structure has a significant effect on the cutting force.The axial force when the laminated sequence is CFRP/2A12 is smaller than when the laminated sequence is 2A12/CFRP.
基金supported by the National High Technology Research and Development Program (the "863" Program)(2010AA101701)
文摘Bamboo deterioration caused by light becomes a significant problem as application of bamboo extends from indoor to outdoor.The color and roughness of bamboo are two important exterior performances.This study focused on UV resistant nano composites coatings for exterior use and what aimed to find a formulation which could enhance the durability of bamboo.Four kinds of film-forming materials and four kinds of nano particles were used to improve bamboo exterior performance.The color and roughness of nano composites coatings were measured during accelerated weathering.Artificial aging time was 174 h at the temperature of 50 ℃.The experiment showed nanocomposites coatings had significant improvement in UV-shielding and nearly all the samples presented a darkening tendency in ΔL* and increasing tendency in Δa*,ΔE* and ΔRa.The orthogonal experiment obtained the least change in color and Ra which could be achieved with nano composites coating made by melamine resin and TiO2 when a* was considered as an important index.Film-forming material was the only factor which had significant influence on color and roughness when a* was not considered as important index,then melamine resin was the best choice.
