的果实分布密度比开心形树高几倍到几十倍，而47年生树的差异不太明显。5人工授粉明显提高库尔勒香梨的座果率，但萼片脱落与人工授粉之间没有直接关系。在宏观上，萼片脱落主要与树势有关，营养...

河北联合大学硕士学位论文AbstractIn the field of the coal,vibrating screen has a very wide range of applications,as animportant part of material processing machinery,with washing,de...

北京理工大学珠海学院2020届本科生毕业设计10 million units per year 18650 7.2 V 7.8Ah Industrial testingequipment Lithium battery production process and workshop designAbstractThe ba...

转化为非晶区的现象就越明显，同时对拉伸过程中的键长、键角、二面角、缠结度、取向度进行分析，揭示温度对拉伸过程中微观结构的影响。关键字：分子动力学模拟；半晶态聚乙烯：拉伸速率；结晶度...

AbstractThe sunflower dish powder was used as the raw material.The organic solvents were usedto extract and classify the flavonoids in the sunflower dish,and the developing agent a...

华侨大学硕士学位论文：聚合物位相光栅参量快速测量方法研究关键词：聚合物位相光栅：激光衍射；光栅参数；快速测量；热压印技术

四川大学硕士学位论文ABSTRACTStaphylococcal enterotoxin B (SEB)belongs to a family of pyrogenic toxinsuperantigens (SAgs)which activate T-cells proliferation and massive release ofi...

西南科技大学硕士研究生学位论文第1川页AbstractIn this paper,methoxy polyethylene glycol(PEG)stabilized goldnanoparticles PEG-AuNPs and thiol functionalized PEG stabilized goldnanopa...

Catalytie cracking of biomass using char-based catalyst in a two-stage Fixed-bedreaetorAbstractThe fir sawdust was used in this experience.We used two vertical fixed bed reactor.Th...

AbstractThe purpose of this study is to improve the quality of teaching,to improve thestudents'chemical core literacy,on the basis of explaining the concept of chemicalcore literac...