Hydraulic metal structure health diagnosis based on data mining technology

In conjunction with association rules for data mining, the connections between testing indices and strong and weak association rules were determined, and new derivative rules were obtained by further reasoning. Association rules were used to analyze correlation and check consistency between indices. This study shows that the judgment obtained by weak association rules or non-association rules is more accurate and more credible than that obtained by strong association rules. When the testing grades of two indices in the weak association rules are inconsistent, the testing grades of indices are more likely to be erroneous, and the mistakes are often caused by human factors. Clustering data mining technology was used to analyze the reliability of a diagnosis, or to perform health diagnosis directly. Analysis showed that the clustering results are related to the indices selected, and that if the indices selected are more significant, the characteristics of clustering results are also more significant, and the analysis or diagnosis is more credible. The indices and diagnosis analysis function produced by this study provide a necessary theoretical foundation and new ideas for the development of hydraulic metal structure health diagnosis technology.

Effects of orientation and distance of goats on blast lung injury characteristics on a plateau above 4500-meter

Purpose:High explosives are used to produce blast waves to study their biological effects.The lungs are considered as the critical target organ in blast-effect studies.The degree of lung hemorrhaging is related to both the explosive power and the increased lung weight.We studied the characteristics of the biological effects from an air explosion of a thermobaric bomb in a high-altitude environment and the lethality and lung injury severity of goats in different orientations and distances.Methods:Goats were placed at 2.5,3,4,and 5 m from the explosion center and exposed them to an air blast at an altitude of 4700-meter.A group of them standing oriented to the right side and the other group seated facing the explosion center vertically.The lung injuries were quantified according to the percentage of surface area contused,and using the pathologic severity scale of lung blast injury(PSSLBI)to score the 4 injury categories(slight,moderate,serious and severe)as 1,2,3,and 4,respectively.The lung coefficient(lung weight[g]/body weight[kg])was the indicator of pulmonary edema and was related to lung injury severity.Blast overpressure data were collected using blast test devices placed at matching locations to represent loadings to goats.All statistical analyses were performed using SPSS,version 26.0,statistical software(SPSS,Inc.,Chicago,IL,USA).Results:In total,127 goats were involved in this study.Right-side-standing goats had a significantly higher mortality rate than those seated vertical-facing(p<0.05).At the 2.5 m distance,the goat mortality was nearly 100%,whereas at 5 m,all the goats survived.Lung injuries of the right-side-standing goats were 1-2 grades more serious than those of seated goats at the same distances,the scores of PSSLBI were significantly higher than the seated vertical-facing goats(p<0.05).The lung coefficient of the right-side-standing goats were significantly higher than those of seated vertical-facing(p<0.05).Mortality,PSSLBI,and the lung coefficient results indicated that the right-side-standing goats experienced severer injuries than the seated vertical-facing goats,and the injuries were lessened as the distance increased.The blast overpressure was consistent with these results.Conclusion:The main killing factors of the thermobaric bomb in the high-altitude environment were blast overpressure,blast wind propulsions and burn.The orientation and distances of the goats significantly affected the blast injury severity.These results may provide a research basis for diagnosing,treating and protecting against injuries from thermobaric explosions.

Wounding characteristics and treatment principles of ground anti-armored vehicle ammunition against armored crew

The wound mechanism,injury characteristics and treatment principles of anti-armored vehicle ammunition against armored crew in the past 20 years are summarized in this paper.Shock vibration,metal jet,depleted uranium aerosol and post armor breaking effect are the main factors for wounding armored crew.Their prominent characteristics are severe injury,high incidence of bone fracture,high rate of depleted uranium injury,and high incidence of multiple/combined injuries.During the treatment,attention must be paid on that the space of armored vehicle is limited,and the casualties should be moved outside of the cabin for comprehensive treatment.Especially,the management of depleted uranium injury and burn/inhalation injury are more important than other injuries for the armored wounds.