Experimental quasi-static crushing tests were conducted by using a universal testing machine format kenaf-epoxy composite elliptical cones. The work focused on the vertex angle's effects on energy absorption capab...Experimental quasi-static crushing tests were conducted by using a universal testing machine format kenaf-epoxy composite elliptical cones. The work focused on the vertex angle's effects on energy absorption capability; the vertex angles vary from 0° to 24° in 6 increments. The failure modes of the kenaf fibre epoxy composite elliptical cones were observed utilising delegate photos taken during the quasistatic crushing test. Load-deformation curves and deformation histories of typical specimens are presented and discussed. Moreover, the effects of cone vertex angles on the load carrying capacity and the energy absorption capability are also discussed. The results show that the energy absorption abilities significantly influence the ellipticity vertex angle as the load carrying capacity. We concluded that the quasi-static axial crushing behaviour of elliptical mat laminated composite cones is strongly affected by their structural geometry and the specific energy absorbed by the composite elliptical cones with vertex angles of 6°, 12°, 18°, and 24°, which is more than an elliptical cone with the vertex angle of 0°(the elliptical tube) at any given deformation. However, the specific energy absorption for the elliptical composite cone showed a positive correlation, i.e., the more the angle increased, the more energy was absorbed. In this regard, an elliptical composite cone with a 24° angle exhibited the best energy absorption capability.展开更多
Axon branching enables neurons to contact with multiple targets and respond to their microenvironment.Owing to its importance in neuronal network formation,axon branching has been studied extensively during the past d...Axon branching enables neurons to contact with multiple targets and respond to their microenvironment.Owing to its importance in neuronal network formation,axon branching has been studied extensively during the past decades.It is reported that ECM(Extra Cellular Matrix)components such as laminin,collagen,and tenascin regulate the morphology and motility of neuronal growth cones in culture,but the effects of their distribution and the change of density on axon branching are not well understood.We fabricated chemically homogeneous substrate by microcontact printing(μCP)and inhomogeneous substrate with different laminin density展开更多
In Gunung Sewu, which locates southeast of Yogyakarta, cone karst composed of the Tertiary pure limestone is utilized intensively for agriculture. High population has been supported by efficient agricultural landuse i...In Gunung Sewu, which locates southeast of Yogyakarta, cone karst composed of the Tertiary pure limestone is utilized intensively for agriculture. High population has been supported by efficient agricultural landuse in this area. The population in the high density areas is increasing until 1990. Especially, the higher steep slope and the top of cones have been utilized as fields by deforestation since few years, because of continuous rapid increase of population.展开更多
基金the Universiti Putra Malaysia for the financial support for this research programme using HiCoE Grant,Ministry of Higher Education,Malaysia
文摘Experimental quasi-static crushing tests were conducted by using a universal testing machine format kenaf-epoxy composite elliptical cones. The work focused on the vertex angle's effects on energy absorption capability; the vertex angles vary from 0° to 24° in 6 increments. The failure modes of the kenaf fibre epoxy composite elliptical cones were observed utilising delegate photos taken during the quasistatic crushing test. Load-deformation curves and deformation histories of typical specimens are presented and discussed. Moreover, the effects of cone vertex angles on the load carrying capacity and the energy absorption capability are also discussed. The results show that the energy absorption abilities significantly influence the ellipticity vertex angle as the load carrying capacity. We concluded that the quasi-static axial crushing behaviour of elliptical mat laminated composite cones is strongly affected by their structural geometry and the specific energy absorbed by the composite elliptical cones with vertex angles of 6°, 12°, 18°, and 24°, which is more than an elliptical cone with the vertex angle of 0°(the elliptical tube) at any given deformation. However, the specific energy absorption for the elliptical composite cone showed a positive correlation, i.e., the more the angle increased, the more energy was absorbed. In this regard, an elliptical composite cone with a 24° angle exhibited the best energy absorption capability.
基金financial support is provided by the National Science Foundation of China(50902025, 20890020 and 90813032)the Ministry of Science and Technology of China(2009CB93001 and 2007CB714502)the Chinese Academy of Sciences,and the Human Frontier Science Program
文摘Axon branching enables neurons to contact with multiple targets and respond to their microenvironment.Owing to its importance in neuronal network formation,axon branching has been studied extensively during the past decades.It is reported that ECM(Extra Cellular Matrix)components such as laminin,collagen,and tenascin regulate the morphology and motility of neuronal growth cones in culture,but the effects of their distribution and the change of density on axon branching are not well understood.We fabricated chemically homogeneous substrate by microcontact printing(μCP)and inhomogeneous substrate with different laminin density
文摘In Gunung Sewu, which locates southeast of Yogyakarta, cone karst composed of the Tertiary pure limestone is utilized intensively for agriculture. High population has been supported by efficient agricultural landuse in this area. The population in the high density areas is increasing until 1990. Especially, the higher steep slope and the top of cones have been utilized as fields by deforestation since few years, because of continuous rapid increase of population.
