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：In order to understand the glass shell's stress of PMT applied in the Jiangmen Underground Neutrino Observation (JUNO) under temperature load to avoid glass shell breakage, the effect of different potting adhesives on the glass's thermal stress is simulated.In the orthogonal test, the material's elastic modulus, Poisson ratio and thermal expansion coefficient are selected as the research factors. The L 25 (5 3 ) orthogonal array is established and there are total 25 sets of numerical simulation schemes. According to the results of range analysis and variance analysis, the primary factor affecting glass's thermal stress is modulus and thermal expansion coefficient. The secondary factor is the Poisson ratio. The elastic modulus has a significant effect on the thermal stress of glass shell.The thermal expansion coefficient has a certain effect on the thermal stress of glass shell. And Poisson's ratio has no significant effect on the thermal stress of glass shell. Curve fitting for the arithmetic mean of each factor level is done and a sensitivity analysis method based on the analytic solution of fitting function is proposed to obtain the sensitive of the design index to each factor. The material modification can be carried out according to the maximum sensitivity parameter. So the selection and modification of the potting material is more pertinence and directivity The research results have great guiding significance and reference value for the practical project.

Assessing the genetic diversity in the population is the prerequisite to start and develop plant breeding projects. Pistacia vera is considered as a commercial species of Pistacia genus. In Iran, Pistachio export is in the second place in terms of non-oil exports and in the first place among horticultural crops. Therefore, we collected and analyzed 11 pistachio genotype (Pistacia vera), from two provinces of Iran regions. Our aims were 1) to assess genetic diversity among some of Irainian pistachio cultivars 2) is there a correlation between species genetic and geographical distance? 3) Genetic structure of populations and taxa. We showed significant differences in quantitative morphological characters in plant species. Akbari cultivars depicted unbiased expected heterozygosity (UHe) in the range of 0.028. Shannon information was high (0.49) in Seifadini cultivars. Akbari cultivars howed the lowest value, 0.029. The observed number of alleles (Na) ranged from 0.261 to 2.700 in Shahpasand cultivars and Kalehghoochi cultivars. The effective number of alleles (Ne) was in the range of 1.021-1.800 for Akbari cultivars and Moosaabadi cultivars .Gene flow (Nm) was relatively low (0.38) in pistachio cultivars. The Mantel test showed correlation (r = 0.33, p=0.0001) between genetic and geographical distances. We reported high genetic diversity, which clearly shows the among some of Irainian pistachio cultivars can adapt to changing environments since high genetic diversity is linked to species adaptability. Present results highlighted the utility of RAPD markers and morphometry methods to investigate genetic diversity in pistachio cultivars.

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