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In order to improve the operating efficiency of the cross-aisles shuttle truck system and the responsiveness to the disturbance of the return task, this paper first proposes a dynamic task scheduling process for the shuttle truck, using an event trigger mechanism. Each time a warehouse return task is generated, the corresponding scheduling optimization algorithm is triggered according to the current task combination mode to re-optimize the task sequence. Secondly, a task sequencing model is established under three combined task modes: full outbound / full return tasks, task mode with in-transit return tasks under the compound operation mode, task mode without in-transit return tasks under the compound operation mode. A fast non-dominated sorting genetic algorithm scheduling algorithm with elite strategy for compound operation mode is proposed. Finally, MATLAB was used to compile the simulation experiment system. The simulation analysis results show that the method can effectively improve the system’s operating efficiency, which verifies the feasibility and effectiveness of the scheduling method.

With AS/RS corbel shelf as research object, the orthogonal experiment was designed, which is composed of 21 groups of schemes and 3 kinds of load conditions. By using the Rack Computer-Aided FEA System based on SAP84, this paper presents the effects of grounding back-stayed and the ground floor height of back-stayed on the strength, rigidity and stability of corbel shelf under normal load, horizontal load in X direction and horizontal load in Y direction. The results show that in all conditions, grounding back-stayed improves the strength and stability of column, and the strength and stability of corbel shelf will be enhanced with the decrease of the ground floor height of back-stayed. This research provides a theoretical basis for the analysis and design of corbel shelf.

DW871 is a Brassica napus dwarf line with unusual and excellent plant type. To study the dwarf-related genes and their expression patterns of DW871. we took B. napus HW871 as control and selected stem tissues at the bolting stage for transcriptome gene expression analysis. Results showed that there were 8665 significant differentially expressed genes between DW871 and HW881. of which 2582 were up-regulated and 6083 down-regulated. The enrichment analysis of GO could be annotated to 22 subcategories in 3 categories. the enrichment analysis of KEGG was annotated to 295 pathways in 31 subcategories in 5 categories. We screened genes closely related to dwarfing traits from significantly different genes, 43 in pectin degradation, 69 in auxin signal transduction, and annotated 22 in the monolignol biosynthesis. It was found that the dwarfing character of DW871 was related to cell elongation, abnormal cell wall formation and cell division, and obstruction of auxin signal transduction. In particular, in monolignol biosynthesis, it is possible to regulate a series of physiological and biochemical processes related to lignin by regulating the expression of enzymes such as PAL and CCR. The differential genes related to dwarfing traits were screened in this research. It could be hypothesized that the dwarfing mechanism of DW871 involving abnormal auxin response and lignin synthesis, which lead to abnormal cell elongation, growth and cell wall changes, and ultimately lead to the dwarfing of DW871. [ABSTRACT FROM AUTHOR]

LSW2018, a Brassica napus germplasm, has typical "dwarf" character at seedling stage, and the plant is short with thick stem and strong lodging resistance. As an ideal dwarf germplasm resource, LSW2018 is especially suitable for mechanized operation and has important utilization value. In order to explore the breeding advantages, and study the inheritance of dwarf character of LSW2018, 119 normal high-stalk Brassica napus cultivars (lines), 12 Brassica rapta cultivars (lines) and 6 Brassica juncea varieties (lines) were selected to construct cross combinations with LSW2018 (P1), and the populations of F1, F2, F3, aBC1 and bBC1 were analyzed. The results indicated that dwarf trait was controlled by a pair of dominant genes, plant height has major gene-polygenic genetic effect, and there is no cytoplasmic effect. [ABSTRACT FROM AUTHOR]

In this study, a hybrid combination was contracted with F1 of Deyou 5, a Brassica napus variety, as female parent and a new line 273R as male parent. In the F2 generation, 6 mutant plants with obvious shorter plant types at seedling stage were selected. After 5 generations of purification, we bred a stable new germplasm, LSW2018. The germplasm shows dwarf marker characters at seedling stage, with shrunken, thicker and darker leaves, shorter petiole. The growth is lightly weak but stable, plant height is significantly shorter than that of the normal variety. From the budding stage to maturity, LSW2018 gradually turned into a normal shape, with shorter internodes and thicker stalks, stronger lodging resistance, and lower branching positions. The flowering habit, branching angle, inflorescence characteristics, primary and secondary branches, grains, and other characteristics of LSW2018 are not significantly different from those of the homologous normal high-stalk line HSW2018, but the plant height and branch height are extremely different. The average transplanting plant height of LSW2018 is 136.24 cm and the direct seeding is 110.4 cm. In short, LSW2018 is considered to be a new short-stem Brassica napus germplasm suitable for mechanized and light-simplified planting, which might have high utilization value and broad application prospects. [ABSTRACT FROM AUTHOR]