Prestress enables the Glulam beam could make full use of the compression strength,and then increase the span,but it still could not reduce all drawbacks,such as cross-section weakening and small force arm.To avoid slo...Prestress enables the Glulam beam could make full use of the compression strength,and then increase the span,but it still could not reduce all drawbacks,such as cross-section weakening and small force arm.To avoid slotting and ensure suitable tension and compression couple,one kind of novel anchor has been proposed,which could meet the bearing capacity requirement.And then the bending test of prestressed Glulam beams with a geometric scale ratio of 1:2 was simulated,to investigate the effect of the force arm on bending capacities,failure modes,and deformation performance.Results show that increasing the force arm could improve the ultimate bending per-formance of the beam significantly,and the anchor arm length has a certain effect on the performance,but it is not obvious.Finally,based on Finite element method analysis,the practice design suggestions have been offered.展开更多
Disposable plastic straws are small,lightweight,and non-degradable,making them rarely recycled and causing severe environmental pollution.However,the search for suitable alternatives,balanc-ing high performance with l...Disposable plastic straws are small,lightweight,and non-degradable,making them rarely recycled and causing severe environmental pollution.However,the search for suitable alternatives,balanc-ing high performance with low cost,poses a substantial challenge.Inspired by bamboo’s flexibility and toughness,this study proposed an innovative solution:a biodegradable drinking straw fab-ricated by winding ultra-thin bamboo slices.The specially prepared bamboo slices demonstrated high tensile strength,exceptional flexibility for bending,and the ability to withstand repeated torsion.To address natural issues of color-producing group migration and mold susceptibility,the bamboo slices underwent simultaneous soaking and ultrasonic treatment.The resulting bam-boo straws exhibited remarkable properties with compressive strength of 16.42-19.01 MPa and bending strength of 14.21-15.02 MPa,which matched or exceeded those of commercial paper straws and were significantly higher than those of polypropylene(PP)and polylactic acid(PLA)straws.When exposed to various beverages,bamboo straws retained their structural integrity,absorbed significantly less water than paper straws,and the wet strength was 4.36 times greater than that of paper straws.Moreover,bamboo drinking straws exhibited low production costs and garnered widespread consumer approval.The strategy for industrial-scale production of bamboo straws offers significant potential for replacing plastic straws.展开更多
Actinorhizal plants contain numerous antioxidants that may play a crucial role in preventing the formation of tumors.H-Ras p21,a member of the Ras-GTPase family,is a promising target to treat various kinds of cancers....Actinorhizal plants contain numerous antioxidants that may play a crucial role in preventing the formation of tumors.H-Ras p21,a member of the Ras-GTPase family,is a promising target to treat various kinds of cancers.An in silico docking study was carried out to identify the inhibitory potential of compounds of these plants against H-Ras by using Discovery Studio 3.5 and by using Autodock 4.2.Docking studies revealed that four compounds,isorhamnetin-7-rhamnoside,quercetin-3-glucoside-7-rhamnoside（present in H.rhamnoides）,zeaxanthin,and translutein（present in H.salicifolia） significantly bind with binding energies-17.1534,-14.7936,-10.2105 and-17.2217 Kcal/mol,respectively,even though they slightly deviate from Lipinski＇s rule.Absorption,distribution,metabolism,excretion and toxicity（ADME/tox） analyses of these compounds and their stereoisomers showed that they were less toxic and non-mutagenic.Amongst them,isorhamntein-7-rhamnoside showed hepatotoxicity.Hence,these compounds can be further investigated in vivo to optimize their formulation and concentration and to develop potential chemical entities for the prevention and treatment of cancers.展开更多
基金supported by the Resources Industry Science and Technology Innovation Joint Funding Project of Nanping(N2021Z003)the Special Project of Service Industry Research of Wuyi University under Grant(2021XJFWCY03)+2 种基金the Research Launch Fund of Wuyi University’s Introduct Talent(YJ202309)the Fujian Training Program of Innovation and Entrepreneurship for Undergraduates(S202210397076)Research on the Stress Performance of Reinforced Bamboo Highway Guardrail with Embedded Channel Steel(LS202304).
文摘Prestress enables the Glulam beam could make full use of the compression strength,and then increase the span,but it still could not reduce all drawbacks,such as cross-section weakening and small force arm.To avoid slotting and ensure suitable tension and compression couple,one kind of novel anchor has been proposed,which could meet the bearing capacity requirement.And then the bending test of prestressed Glulam beams with a geometric scale ratio of 1:2 was simulated,to investigate the effect of the force arm on bending capacities,failure modes,and deformation performance.Results show that increasing the force arm could improve the ultimate bending per-formance of the beam significantly,and the anchor arm length has a certain effect on the performance,but it is not obvious.Finally,based on Finite element method analysis,the practice design suggestions have been offered.
基金supported by the National Key R&D Program of China(No.2023YFD2202101)the National Natural Science Foundation of China(No.32230072)+1 种基金the Foundation of International Centre for Bamboo and Rattan(No.1632023001)the Science and Technology Program of Fujian Province(No.2023N3012).
文摘Disposable plastic straws are small,lightweight,and non-degradable,making them rarely recycled and causing severe environmental pollution.However,the search for suitable alternatives,balanc-ing high performance with low cost,poses a substantial challenge.Inspired by bamboo’s flexibility and toughness,this study proposed an innovative solution:a biodegradable drinking straw fab-ricated by winding ultra-thin bamboo slices.The specially prepared bamboo slices demonstrated high tensile strength,exceptional flexibility for bending,and the ability to withstand repeated torsion.To address natural issues of color-producing group migration and mold susceptibility,the bamboo slices underwent simultaneous soaking and ultrasonic treatment.The resulting bam-boo straws exhibited remarkable properties with compressive strength of 16.42-19.01 MPa and bending strength of 14.21-15.02 MPa,which matched or exceeded those of commercial paper straws and were significantly higher than those of polypropylene(PP)and polylactic acid(PLA)straws.When exposed to various beverages,bamboo straws retained their structural integrity,absorbed significantly less water than paper straws,and the wet strength was 4.36 times greater than that of paper straws.Moreover,bamboo drinking straws exhibited low production costs and garnered widespread consumer approval.The strategy for industrial-scale production of bamboo straws offers significant potential for replacing plastic straws.
文摘Actinorhizal plants contain numerous antioxidants that may play a crucial role in preventing the formation of tumors.H-Ras p21,a member of the Ras-GTPase family,is a promising target to treat various kinds of cancers.An in silico docking study was carried out to identify the inhibitory potential of compounds of these plants against H-Ras by using Discovery Studio 3.5 and by using Autodock 4.2.Docking studies revealed that four compounds,isorhamnetin-7-rhamnoside,quercetin-3-glucoside-7-rhamnoside（present in H.rhamnoides）,zeaxanthin,and translutein（present in H.salicifolia） significantly bind with binding energies-17.1534,-14.7936,-10.2105 and-17.2217 Kcal/mol,respectively,even though they slightly deviate from Lipinski＇s rule.Absorption,distribution,metabolism,excretion and toxicity（ADME/tox） analyses of these compounds and their stereoisomers showed that they were less toxic and non-mutagenic.Amongst them,isorhamntein-7-rhamnoside showed hepatotoxicity.Hence,these compounds can be further investigated in vivo to optimize their formulation and concentration and to develop potential chemical entities for the prevention and treatment of cancers.
