Based On The Finite Element Method (fem) Of Electric Vehicle Frame Structure Analysis And Optimization

Since the21st century， a large number of researchers have paid much attention toinference of a deeper phylogenetic relationship of decapoda employing wholemitochondrial genome sequences. Although more than30mitochondrial genomesequences have been determined for decapod to date，the taxonomic sampling is stillhighly biased among decapoda species.The order Decapod are the most species-rich group of Crustacea. As aphylogenetically valuable subject， the decapods have gained a huge number of studieswith morphological characters and molecular characters.Though Decapod itself iswidely regarded as a monophyletic group， there is no consensus on the phylogenyrelationships among the major lineages of Decapoda as yet.As a phylogenetically valuable decapoda， a complete mitochondrial genomefrom Stenopodidea has not been reported to date. Here， we report the completemitochondrial DNA sequence of the Stenopus hispidus (Olivier1811). The15528bpgenome is a circular molecule and consists of13protein-coding genes (PCGs) andtwo ribosomal RNA(rRNA) genes plus the putative control region (CR) as found inother metazoan animals， with the exception of23transfer RNA (tRNA) genes，which contains an additional trnQ compared with other crustaceans. With respect tothe pancrustacean ground pattern mitochondria gene order，5tRNAs appear to berearranged (trnL1，trnE，trnR，trnM，trnQ)， one of which has also undergoneinversion (trnL1)， indicating gene order is not conserved among Stenopodidea.We use both the concatenated nucleotide and amino acid sequences of13protein-coding genes to investigate the phylogenetic relationship among the majorlineages of Decapoda. Our phylogenetic analysis indicate strong support for themonophyly of Decapoda， Dendrobranchiata， Pleocyemata and Reptantia.， alsostrongly support the monophyly of the Caridea， Stenopodidea， Anomura，Brachyura， Palinura and Astacidea. Our results reveal Caridea occupy the basal position in Pleocyemata， Stenopodidea and Reptantia form sister groups. Anomuraand Brachyura form a monophyletic clade， which is widely accepted as a naturalgroup named Meiura. As a sister group to the Meiura， Palinura and Astacidea formanother monophyletic clade. The Bayesian trees indicated strong statistical support for((Anomura+Brachyura)+(Palinura+Astacidea)).