First, a theoretical model of density of cuttage seedlings on poplar was evaluated by using mathematical tools based on anatomy and morphology of photosynthesis organ, then,according to this, an afforestation density ...First, a theoretical model of density of cuttage seedlings on poplar was evaluated by using mathematical tools based on anatomy and morphology of photosynthesis organ, then,according to this, an afforestation density of the trces was put forward, finally, the importance,scope and method of the theoretic application wcre described through a concretc calculation. The result showed that these density models had not only rigorous theory base, including biology and mathematics, but also wide applying prospect. And at the same timc, the model parameters could be gotten easily in forestry practice.展开更多
[Objectives]This study was conducted to improve the propagation efficiency of Gardenia jasminoides Ellis and improve the quality of plantlets.[Methods]A G.jasminoides cutting experiment was carried out with three diff...[Objectives]This study was conducted to improve the propagation efficiency of Gardenia jasminoides Ellis and improve the quality of plantlets.[Methods]A G.jasminoides cutting experiment was carried out with three different cuttage modes and two cutting treatment methods,and the rooting time,rooting rate,root amount and plantlet growth were measured and analyzed.[Results]The three-dimensional cutting model of CL1 could not only shorten the nursery cycle and promote root development,but also effectively improve the quality of plantlets and increase the yield of plantlets per unit area.It is an ideal way to improve the quality and efficiency of cutting plantlets.[Conclusions]This study has a positive role in promoting the healthy development of the nursery stock industry.展开更多
LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)material,as the promising cathode candidate for next-generation highenergy lithium-ion batteries,has gained considerable attention for extremely high theoretical capacity and low...LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)material,as the promising cathode candidate for next-generation highenergy lithium-ion batteries,has gained considerable attention for extremely high theoretical capacity and low cost.Nevertheless,the intrinsic drawbacks of NCM811 such as unstable structure and inevitable interface side reaction result in severe capacity decay and thermal runaway.Herein,a novel polyimide(denoted as PI-Om DT)constructed with the highly polar and micro-branched crosslinking network is reported as a binder material for NCM811 cathode.The micro-branched crosslinking network is achieved by using 1,3,5-Tris(4-aminophenoxy)benzene(TAPOB)as a crosslinker via condensation reaction,which endows excellent mechanical properties and large free volume.Meanwhile,the massive polar carboxyl(-COOH)groups provide strong adhesion sites to active NCM811 particles.These functions of PIOm DT binder collaboratively benefit to forming the mechanically robust and homogeneous coating layer with rapid Li+diffusion on the surface of NCM811,significantly stabilizing the cathode structure,suppressing the detrimental interface side reaction and guaranteeing the shorter ion-diffusion and electron-transfer paths,consequently enhancing electrochemical performance.As compared to the NCM811 with PVDF binder,the NCM811 using PI-Om DT binder delivers a superior high-rate capacity(121.07 vs.145.38 m Ah g^(-1))at 5 C rate and maintains a higher capacity retention(80.38%vs.91.6%)after100 cycles at 2.5–4.3 V.Particularly,at the high-voltage conditions up to 4.5 and 4.7 V,the NCM811 with PI-Om DT binder still maintains the remarkable capacity retention of 88.86%and 72.5%after 100 cycles,respectively,paving the way for addressing the high-voltage operating stability of the NCM811 cathode.Moreover,the full-charged NCM811 cathode with PI-Om DT binder exhibits a significantly enhanced thermal stability,improving the safety performance of batteries.This work opens a new avenue for developing high-energy NCM811 based lithium-ion batteries with long cycle-life and superior safety performance using a novel and effective binder.展开更多
[目的]探究该物种扦插生根机理,便于品种的快速繁殖及应用推广。[方法]以不同扦插基质类型、激素类型及激素水平组合测定地中海荚蒾扦插后0、5、10、15和20 d 5个时期的生根情况及不同营养物质、相关酶活性和内源激素等生理指标的变化...[目的]探究该物种扦插生根机理,便于品种的快速繁殖及应用推广。[方法]以不同扦插基质类型、激素类型及激素水平组合测定地中海荚蒾扦插后0、5、10、15和20 d 5个时期的生根情况及不同营养物质、相关酶活性和内源激素等生理指标的变化趋势。[结果]扦插基质类型、外源激素类型及浓度对荚蒾扦插生根率、生根数及根长产生了极显著差异,蛭石、珍珠岩混合基质与NAA+IBA(500 mg/L)激素组合下地中海荚蒾的生根效果最好,其生根率、生根数和根长最高。可溶性糖、可溶性蛋白含量均呈上升—下降—上升的趋势,均在插后第5天达到峰值。过氧化物酶(POD)活性呈现上升—下降—再上升的趋势,多酚氧化酶(PPO)和吲哚乙酸氧化酶(IAAO)活性呈先上升后下降的变化趋势。4种内源激素(IAA、ABA、GA_(3)、ZR)含量变化较为复杂,呈波浪型变化。[结论]蛭石、珍珠岩混合基质与NAA+IBA(500 mg/L)激素组合的处理方式适用于地中海荚蒾的扦插。该研究开展的通过外源施加物质的方法提高扦插成活率提供了理论基础,也为地中海荚蒾南种北繁起到了促进作用。展开更多
文摘First, a theoretical model of density of cuttage seedlings on poplar was evaluated by using mathematical tools based on anatomy and morphology of photosynthesis organ, then,according to this, an afforestation density of the trces was put forward, finally, the importance,scope and method of the theoretic application wcre described through a concretc calculation. The result showed that these density models had not only rigorous theory base, including biology and mathematics, but also wide applying prospect. And at the same timc, the model parameters could be gotten easily in forestry practice.
基金Supported by Changsha Science and Technology Planning Project (kq1801028)Major Landmark Innovation Demonstration Project (2019XK2002)
文摘[Objectives]This study was conducted to improve the propagation efficiency of Gardenia jasminoides Ellis and improve the quality of plantlets.[Methods]A G.jasminoides cutting experiment was carried out with three different cuttage modes and two cutting treatment methods,and the rooting time,rooting rate,root amount and plantlet growth were measured and analyzed.[Results]The three-dimensional cutting model of CL1 could not only shorten the nursery cycle and promote root development,but also effectively improve the quality of plantlets and increase the yield of plantlets per unit area.It is an ideal way to improve the quality and efficiency of cutting plantlets.[Conclusions]This study has a positive role in promoting the healthy development of the nursery stock industry.
基金supported by the Fundamental Research Funds for the Central Universities(XK1802-2)the National Key Basic Research Program of China(973 Program,2014CB643604)+2 种基金the National Natural Science Foundation of China(51673017)National Natural Science Foundation of China(21404005)the Natural Science Foundation of Jiangsu Province(BK20150273)。
文摘LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)material,as the promising cathode candidate for next-generation highenergy lithium-ion batteries,has gained considerable attention for extremely high theoretical capacity and low cost.Nevertheless,the intrinsic drawbacks of NCM811 such as unstable structure and inevitable interface side reaction result in severe capacity decay and thermal runaway.Herein,a novel polyimide(denoted as PI-Om DT)constructed with the highly polar and micro-branched crosslinking network is reported as a binder material for NCM811 cathode.The micro-branched crosslinking network is achieved by using 1,3,5-Tris(4-aminophenoxy)benzene(TAPOB)as a crosslinker via condensation reaction,which endows excellent mechanical properties and large free volume.Meanwhile,the massive polar carboxyl(-COOH)groups provide strong adhesion sites to active NCM811 particles.These functions of PIOm DT binder collaboratively benefit to forming the mechanically robust and homogeneous coating layer with rapid Li+diffusion on the surface of NCM811,significantly stabilizing the cathode structure,suppressing the detrimental interface side reaction and guaranteeing the shorter ion-diffusion and electron-transfer paths,consequently enhancing electrochemical performance.As compared to the NCM811 with PVDF binder,the NCM811 using PI-Om DT binder delivers a superior high-rate capacity(121.07 vs.145.38 m Ah g^(-1))at 5 C rate and maintains a higher capacity retention(80.38%vs.91.6%)after100 cycles at 2.5–4.3 V.Particularly,at the high-voltage conditions up to 4.5 and 4.7 V,the NCM811 with PI-Om DT binder still maintains the remarkable capacity retention of 88.86%and 72.5%after 100 cycles,respectively,paving the way for addressing the high-voltage operating stability of the NCM811 cathode.Moreover,the full-charged NCM811 cathode with PI-Om DT binder exhibits a significantly enhanced thermal stability,improving the safety performance of batteries.This work opens a new avenue for developing high-energy NCM811 based lithium-ion batteries with long cycle-life and superior safety performance using a novel and effective binder.
文摘[目的]探究该物种扦插生根机理,便于品种的快速繁殖及应用推广。[方法]以不同扦插基质类型、激素类型及激素水平组合测定地中海荚蒾扦插后0、5、10、15和20 d 5个时期的生根情况及不同营养物质、相关酶活性和内源激素等生理指标的变化趋势。[结果]扦插基质类型、外源激素类型及浓度对荚蒾扦插生根率、生根数及根长产生了极显著差异,蛭石、珍珠岩混合基质与NAA+IBA(500 mg/L)激素组合下地中海荚蒾的生根效果最好,其生根率、生根数和根长最高。可溶性糖、可溶性蛋白含量均呈上升—下降—上升的趋势,均在插后第5天达到峰值。过氧化物酶(POD)活性呈现上升—下降—再上升的趋势,多酚氧化酶(PPO)和吲哚乙酸氧化酶(IAAO)活性呈先上升后下降的变化趋势。4种内源激素(IAA、ABA、GA_(3)、ZR)含量变化较为复杂,呈波浪型变化。[结论]蛭石、珍珠岩混合基质与NAA+IBA(500 mg/L)激素组合的处理方式适用于地中海荚蒾的扦插。该研究开展的通过外源施加物质的方法提高扦插成活率提供了理论基础,也为地中海荚蒾南种北繁起到了促进作用。
