Currently, laser ultrasonic nondestructive testing is the best application prospect of nondestructive testing methods. This paper expounds the mechanism and the qualitative analysis of the common defects of the laser ultrasonic inspection and introduces the application of matching pursuit algorithm guided wave testing technology in signal processing. This paper focuses on the laser ultrasonic detection system and analysis of the detected data using the finite element method.

Air-coupled ultrasonic non-destructive testing technology, possessing the characters of complete non-contact and non-destruction, can be used in some situations in which traditional testing is hardly applicable. This article summarized the development of air-coupled ultrasonic non-destructive testing technology briefly, the main existing problems that restrict its progress are analyzed respectively from three processes, concluded and summarized the development and progress of the current solutions to these problems. People can promote the development of this technology more efficiently and directly by the research of its present development.

Objective Cardiovascular involvement in patients with antineutrophil cytoplasmic antibody (ANCA) associated glomerulonephritis (AGN) could be asymptomatic but is closely associated with patients’ prognosis. The aim of this study was to evaluate the cardiovascular involvement using standard echocardiographic measurements and determine echocardiographic predictors for cardiovascular mortality in those patients. MethodsPatients with newly diagnosed AGN from Department of Nephrology, Ruijin Hospital undergoing transthoracic echocardiography were retrospectively studied. Cox proportional hazards models were used to investigate baseline variables associated with cardiovascular mortalities. Results Of 319 patients enrolled in our study, 221 patients had echocardiographic abnormalities. Valvular abnormalities were the most common presentation of cardiovascular involvement and valvular regurgitation was the most commonly presentation of echocardiographic abnormality. Patients with echocardiographic abnormalities had more severe renal involvement. And patients with more advanced age and more severe renal involvement had worse cardiovascular outcome. Kaplan-Meier estimator showed a 3.4-time higher risk of cardiovascular mortality in patients with echocardiographic abnormalities than those without (p<0.01). Left ventricular end diastolic volume (LVEDV, HR=1.63, p<0.001), left ventricular end systolic volume (LVESV, HR=1.47, p<0.001) and left ventricular ejection fraction (LVEF, HR=0.72, p<0.05), are independent predictors of cardiovascular mortality. Conclusions Cardiac involvement was prevalent in patients with AGN. LVEDV, LVESV and LVEF assessed by echocardiography at disease onset are independent prognostic factors for cardiovascular mortality in AGN patients. Our results suggest that echocardiography is a sensitive and non-invasive tool to evaluate cardiovascular abnormalities in AGN patients which could be applied to detect those abnormalities in early stages.

Calculation results are showing: There are basically specific relationships between loading machine’s weight and loading machines’ main parameters or other parameters’ combinations. So these specific relationships have certain similarity. And machine’s similarity criteria has invariance. The similarity equations derived from similarity theory basically coincide with quantitative analysis results from practical samples data. So, it is proved that there is a kind of similarity between loading machine’s practical design and development and similarity system’s design of structure size. So, the theory of simulation design is completely applied to practical design process.