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During and after the in-situ mining of anthracite coalbed methane, the influence of temperature on anthracite coal has become an important factor in judging whether a project can be implemented. In this paper, the stress-strain curves of anthracite at 10 MPa hydrostatic pressure and different temperatures, stress-strain curves at 300 ℃ and different hydrostatic pressures, the stress-strain curves of anthracite under different hydrostatic pressures under temperature rise of 500 ℃ and then slow cooling to 300 ℃, were studied by using the servo experiment device independently developed by the Key Laboratory of In-situ Modified Mining of Ministry of Education, Taiyuan University of Technology. The results show that during the process of heating up, anthracite exhibits different thermal expansion laws under different hydrostatic pressure conditions. The greater the hydrostatic pressure, the smaller the thermal deformation; as the temperature increases, the elastic modulus and peak strength of anthracite will decrease accordingly; the confining pressure will enhance the strength of anthracite, which is specifically expressed in that with the increase of hydrostatic pressure, the elastic modulus and peak strength of anthracite will increase; the weakening effect of high temperature on anthracite is irreversible. The performance is that when anthracite is directly heated to 300 °C, the cohesion and internal friction angle of the two are different from that of anthracite when the temperature is raised 500 °C and then lowered to 300 °C. This paper uses orthogonal experiments to fit the elastic modulus of anthracite within 15 MPa and 300 ℃ as a function of confining pressure and temperature.

Objective: To explore the application values of ultrasound contrast combined with ultrasound elastography quantitative analysis of tissue diffusion in the diagnosis of breast cancer. Methods: From January 2019 to May 2020, 148 cases of breast tumor patients were selected for diagnosis and treatment in our hospital. All patients were given ultrasound contrast combined with ultrasound elastography for quantitative analysis of tissue diffusion, and the imaging characteristics were recorded. Results: There were 32 cases were diagnosed as breast cancer by pathology (malignant group) and 116 cases were benign breast tumors (benign group) in the 148 cases. The benign group and malignant group compared were statistically significant differences in ultrasound lesion shape, margin, echo, microcalcification and other characteristics (P<0.05). The contrast enhancement mode and intensity of ultrasound contrast in the malignant group were significantly different from those in the benign group (P<0.05). The area under the curve (AUC), Peak intensity (PI), and wereh in slope (WIS) values of the malignant group were higher than those of the benign group, and the Time To Peak(TTP) values were lower than the benign group, and the contrast difference were statistically significant (P<0.05). The quantitative parameter of tissue diffusion in the malignant group were lower than the benign group in the blue area area ratio (% AREA), and the standard deviation (SD) and mean (MEAN) values were higher than the benign group(P<0.05). Conclusion: The application of ultrasound contrast combined with ultrasonic elastography quantitative analysis of tissue dispersion in the diagnosis of breast cancer is an economical, fast, non-invasive, and reproducible examination method that can quantitatively assess the imaging characteristics of breast cancer clinical treatment provides more valuable information. [ABSTRACT FROM AUTHOR]

The purpose of this study is to explore the correlation between shear wave elastography (SWE) technical parameters and contrast-enhanced ultrasound (CEUS) parameters of benign and malignant thyroid nodules, and the value of combined diagnosis of benign and malignant thyroid nodules by SWE and CEUS. Fifty-one patients with malignant thyroid nodules in our hospital were selected as the malignant group, and 63 patients with benign thyroid nodules were selected as the benign group. All of them underwent SWE and CEUS examinations. The diagnostic value was analyzed. The results of the study found that Emin, Emean, Emax and Peak was negatively correlated and positively correlated with Tp (P<0.05); the AUC value of the combined diagnosis of malignant thyroid nodules by SWE and CEUS was 0.952, which was greater than any single index diagnosis (P<0.05); Emin, Emean, Emax, Tp, MTT is positively correlated with clinical stage, nodule size, and calcification, and negatively correlated with the degree of differentiation. Peak is negatively correlated with clinical stage, nodule size, and calcification, and positively correlated with the degree of differentiation (P<0.05). These results can be It is confirmed that the combination of SWE technology and CEUS in the diagnosis of thyroid benign and malignant nodules is of high value, and plays an important role in guiding clinical development of treatment plans. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)