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12个杏品种(系)果实品质的比较研究
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作者 孙海龙 鲁晓峰 +2 位作者 王阳 刘硕 张玉萍 《中国果树》 2024年第6期94-101,共8页
以12个杏品种(系)为试验材料,对其单果重、纵径、横径、可溶性固形物含量、可滴定酸含量、硬度、黏附性、内聚性、弹性、胶黏性、咀嚼性、破裂力、破裂位移、破裂功、果肉硬度、果肉做功、脆性共17项指标进行测定,进行相关性分析,并通... 以12个杏品种(系)为试验材料,对其单果重、纵径、横径、可溶性固形物含量、可滴定酸含量、硬度、黏附性、内聚性、弹性、胶黏性、咀嚼性、破裂力、破裂位移、破裂功、果肉硬度、果肉做功、脆性共17项指标进行测定,进行相关性分析,并通过主成分分析计算得分及排序,进一步进行系统聚类分析。结果显示:不同品种(系)间各性状指标存在显著差异,内聚性和破裂位移变异系数较小,其他各指标变异系数均在20%以上;相关性分析结果表明,17项指标间存在一定的相关性和信息重叠,其中22对性状的相关系数达到极显著水平,21对性状的相关系数达到显著水平;主成分分析结果表明,前4个因子特征值均大于1,代表了17项指标的88.161%的信息,根据主成分得分以及权重,在4个主成分上的得分靠前的品种(系)分别是15-2-8、国之鲜和山黄杏,综合得分靠前的品种(系)是红玉、15-2-8、鸡蛋杏、沙金红和国之鲜;聚类分析结果表明,12个杏品种(系)可聚为4类,第1类以珍珠油杏为代表,可溶性固形物含量高,黏附性大,单果重小;第2类以金太阳为代表,可滴定酸含量、破裂位移和破裂功高;第3类以早橙为代表,弹性最大;第4类以15-2-8为代表,质地硬脆,咀嚼性好。研究结果为杏果实品质评价和分类提供了理论基础,为进一步选育特色、优质杏新品种提供依据。 展开更多
关键词 物性仪分析 质地 主成分分析 聚类分析
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Pyrolysis characteristics of rubber compositions in medical waste 被引量:3
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作者 邓娜 王维维 +3 位作者 陈广武 张彦 张于峰 马洪亭 《Journal of Central South University》 SCIE EI CAS 2013年第9期2466-2471,共6页
Thermogravimetric study of rubber compositions (operating glove and catheter) in medical waste was carried out using the thermogravimetric analyser (TGA),at the heating rate of 20 ℃/min in a stream of N2.The resu... Thermogravimetric study of rubber compositions (operating glove and catheter) in medical waste was carried out using the thermogravimetric analyser (TGA),at the heating rate of 20 ℃/min in a stream of N2.The results indicate that the decomposition process of operating glove appears an obvious mass loss stage at 250-485 ℃,while catheter has two obvious stages at 240-510 ℃ and 655-800 ℃,respectively; both samples present endothermic pyrolysis reaction; the decomposition of operating glove and the first mass loss stage of catheter are in agreement with natural rubber pyrolysis; the second mass loss stage of catheter corresponds to CaCO3 decomposition.Based on the experimental results,a novel two-step four-reaction model was established to simulate the whole continuous processes,which could more satisfactorily describe and predict the pyrolysis processes of rubber compositions,being more mechanistic and conveniently serving for the engineering. 展开更多
关键词 medical waste RUBBER operating glove CATHETER PYROLYSIS MODEL
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A novel polymer-on-silicon Mach-Zehnder interferometer optical filter and the performance analysis based on spectrum-periodized theory 被引量:1
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作者 郑传涛 曹天书 +4 位作者 王锐 梁磊 马春生 崔占臣 张大明 《Optoelectronics Letters》 EI 2012年第3期168-171,共4页
The analysis on the traditional asymmetric Mach-Zehnder interferometer (AMZI) optical filter based on two 3 dB directional couplers (DCs) shows that by adding an additional nonlinear phase generated by phase-generatin... The analysis on the traditional asymmetric Mach-Zehnder interferometer (AMZI) optical filter based on two 3 dB directional couplers (DCs) shows that by adding an additional nonlinear phase generated by phase-generating coupler (PGC) to the original phase difference of the AMZI, its non-periodic frequency response can be modified, and a strictly periodic spectrum can be obtained. A novel structure of the AMZI filter using two PGCs before and after the AMZI region is proposed. With the needed free spectrum range (FSR) of 20 nm, the design and optimization of the device are performed using polymer SU-8 as the core and PMMA-GMA as the buffer. Though the insertion loss (IL) gets larger than that of the traditional AMZI filter, the FSR is nearly uniform as the expected period of 20 nm. 展开更多
关键词 Frequency response Optical filters
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