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In allusion to problems that current roadheader uses single transverse roadheader or longitudinal roadheader and is difficult to adapt to excavation work of different rocks, the paper proposed an interchangeability design scheme of cutting arms of roadheader facing to different rocks, and analyzed different structural features and performances of transverse roadheader and longitudinal roadheader. According to operating modes of the two cutting arms, corresponding cutting reducers were designed. Solidworks simulation result showed that compared to the single transverse roadheader or longitudinal roadheader, roadheader with interchangeable cutting arms has better adaptability to excavation work of different rocks, higher excavation efficiency and lower cost.

The purpose of the experiment was to study the feasibility of fox carcass as meat and bone meal and evaluate the safety of fox meat and bone meal. Three healthy blue foxes (39 in total) weighing about 15 kg were randomly selected from 13 fox breeding areas in China. Fox carcass (including viscera and toe claws) was made into meat and bone meal by grinding, high-pressure hydrolysis, degreasing, drying, and crushing. Routine nutrients, heavy metals, veterinary drug residues, and canine distemper virus were determined, respectively, and the safety was evaluated. The results showed that the content of crude protein in meat and bone meal was between 55% and 67%, which meets the requirements of crude protein in the first-class index of Bone Meal and Meat and Bone Meal for Feed. The concentrations of lead, arsenic, mercury, cadmium, and chromium meet the requirements of the national standard for the hygiene and safety standards of meat and bone meal. Sulfamethazine, sulfamethoxazole, sulfamethoxazine, sulfadiazine, penicillin, oxytetracycline, and gentamicin meet the standard requirements of maximum residue limits of veterinary drugs in food. The results showed that fox meat and bone meal was rich in nutritional value, and its hygiene and safety indexes met the raw material standard of protein feed. [ABSTRACT FROM AUTHOR]

In order to mitigate the impact of supply interruption on enterprises,a dual objective closed-loop supply chain network model considering fuzzy pricing and interruption risk under competitive environment is proposed.The uncertain demand is defined as the price function provided to customers by the supply chain and its competitors,so that the supply chain can maximize the total profit and minimize the carbon emission in the competitive environment.In this paper,the proposed model is solved based on the possibility theory,and the dual-objective model is transformed into a single-objective model.Finally,a real case is used for numerical example analysis.The conclusion shows that the proposed model can not only enhance the ability of supply chain to resist risks,but also help to improve the strategic position in market.

Objective: To analyze the literature knowledge structure and acupoint matching rules of acupuncture for depression., Methods: The articles regarding acupuncture for depression published from January 1 of 1984 to October 19 of 2020 were searched in CNKI database. CiteSpace5.7.R2 software was used to import the literature data, and the keyword cluster analysis, emergence analysis and time-zone analysis of articles and acupoints were conducted, and the map of scientific knowledge was draw., Results: A total of 3524 articles were included to the knowledge structure analysis, while 601 articles into the acupoint matching rules analysis. There were 13 keyword clusters of acupuncture for depression, with "post-stroke depression" and "electroacupuncture treatment" as high-frequency keywords, and "electroacupuncture treatment" and "Hamilton depression scale" had high centrality, and "electroacupuncture treatment" had the highest emergence intensity. The keywords such as "electroacupuncture treatment" and "Hamilton depression scale", etc. appeared the earliest, followed by "post-stroke depression", "fluoxetine" and "auricular point therapy", etc. According to traditional Chinese medicine theory, acupoint keywords were divided into four clusters: ①core acupoint, ②replenishing-spleen and dispelling phlegm, dispersing-liver and relieving depression, reinforcing qi and nourishing blood, ③back- shu points, five- zhi points, ④inducing-resuscitation and opening-closes., Conclusion: The main knowledge structure of acupuncture for depression includes five parts: treatment method, depression type, TCM-related diseases, literature type and curative effect index. Clinical acupoint matching should adhere to the principle of "focusing the disease before syndrome" and "combination of disease and syndrome", and treatment should be modified for the syndromes of phlegm stagnation blocking, liver-stagnation and qi -stagnation, and deficiency of both qi and blood.