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In order to prepare high-performance asphalt pavement repair materials, nine kinds of cold patching asphalt with different proportions were developed. The contact angle of cold patching asphalt was measured and its cohesive energy, adhesion energy, peeling energy and energy ratio were calculated by surface free energy theory. The theoretical calculation results were verified by quantitative adhesion testing methods. The results show that the optimum ratio obtained by the rotational viscosity at 60 °C, the water boiling method, the photoelectric colorimetry and the binder bond strength test is consistent with that obtained by the surface free theory, and there is no significant difference between the results reflected by the three adhesion test methods. The best mix ratio of cold patching asphalt is asphalt): m (diesel): m (SBS): tackifier): m(anti-stripping agent) = 100: 30: 3: 5 : 0. 5. The adhesion can be evaluated quantitatively by combining photoelectric colorimetry with contact angle test or by combining binder bond strength test with contact angle test. [ABSTRACT FROM AUTHOR]

Tn order to improve the shortcomings of airport pavement repair mortar, such as high brittleness and poor bonding performance, a kind of quick mortar was prepared by using waterborne epoxy resin (WER), polypropylene (PP) fiber and sulfoaluminate cement (SAC), and its working performance, mechanical properties, damping properties and sulfate corrosion resistance were studied. The results show that PP fiber and WER can significantly improve the toughness and bonding properties of the quick repair mortar, making the 2 h compressive and folding strength and bonding strength of the quick repair mortar reach 22.3, 5.1 and 3.7 MPa respectively, meeting the requirements of civil airport specifications, and improving the damping performance and sulfate erosion resistance of the quick repair mortar. [ABSTRACT FROM AUTHOR]

目的观察并比较核磁共振(MR)压脂T2WI联合弥散加权成像(T2WI/DWI)及增强CT对中心型肺癌与肺不张的显像效果。方法对33例中心型肺癌患者分别进行增强CT检查及MRI检查,观察CT图像与MR压脂T2WI/DWI图像特点,比较两种方法所获图像中肺肿瘤组织与肺不张组织的显示情况。结果 33例肺部CT检查及MRI检查所得图像清晰,能满足诊断需求。CT图像可清晰显示肺部及纵隔解剖结构,但肿瘤与肺不张界限不易区分。MR压脂T2WI图像中,肿瘤组织呈稍高或等信号,不张肺组织呈楔形高信号;DWI图像空间分辨率低,解剖层次不清。将DWI与T2WI结合,可清晰显示肿块范围。本组病例中,增强CT图像可显示肿瘤与不张肺组织边界12例(36.4%),MR压脂T2WI/DWI图像可显示肿瘤与肺不张组织边界28例(84.8%),两种检查方法相比,P<0.05。结论 MR压脂T2WI/DWI较增强CT可更清晰地显示肺不张与肺肿瘤边界,显像效果更好。 [ABSTRACT FROM AUTHOR]

Using SK-90# matrix asphalt, the orthogonal experiment with 6 test variables was adopted to prepare composite modifying asphalt. The determined technical indexes were analyzed by gray relational analysis to obtain the optimum preparation process parameters of composite modifying asphalt. The results show that the softening point and 5 ℃ ductility of asphalt are significantly improved by SBS-rubber powder-HDPE, and the elastic recovery rate of the twenty-second group sample reaches 60% with good elasticity. The optimum technological parameters for preparing SBS-rubber powder-HDPE modifying asphalt are determined by gray relational analysis with modifier SBS content of 5.0%, modifier powder content of 20.0%, modifier HDPE of 4.5%, shear rate of 4 500 r·min-1, shear time of 45 min and shear temperature of 170 ℃. SBS and HDPE are intertwined with each other under the action of high temperature shearing to form three-dimensional network structure with polymer as dispersion medium and asphalt as dispersed phase, and the overall performance of composite modifying asphalt is improved. [ABSTRACT FROM AUTHOR]

To solve the pavement runoff quality change after infiltrated through permeable asphalt pavement materials, the permeable pavement infiltrate apparatus was developed. The effects of 3 filtration functions of porous pavement materials and thickness on the filtration efficiency and mechanism for runoff water were investigated by measuring 16 pollutant indices. The results show that porous pavement material type and thickness have significant effect on the removal efficiency of pollutants. Natural sand has high removal efficiency on TP, COD, Zn, BOD, PP and Cr6+. The removal efficiency of natural sand can be improved by increasing the thickness. Open-graded gravel has significant effect on the removal efficiency for Pb, NH4-N, AVO, COD and BOD in pavement runoff. Porous asphalt concrete has high removal efficiency for the pollutions of NH4-N, Pb and TP. [ABSTRACT FROM AUTHOR]

Objective: To study the effects of goserelin combined with endocrine drugs on disease progression and survival of premenopausal advanced breast cancer patients. Methods: We retrospectively analyzed the data of 157 cases of premenopausal advanced breast cancer patients in our hospital. Among them, 78 patients had goserelin during hospitalization were taken as control group, and another 79 patients taking goserelin and endocrine drugs in combination regimens as treatment group. Compare the disease progression during hospitalization and survival situation between two groups. Results: There were no differences in data during the course of standard treatment between groups (P>0.05). After treatment, the breast cancer disease progression were significantly better in the treatment group than in the control group, and differences between different time groups had statistical significance (P<0.05). In the one-year follow up, there were differences in the reoccurrence, cases with life quality classified as excellent and death cases between the two groups (P <0. 01). Conclusion: The combination of goserelin and endocrine drugs has good progression control effect for patients with advanced breast cancer before menopause. [ABSTRACT FROM AUTHOR]