微波作用对煤微观孔隙影响的研究

本文通过对煤样进行工业微波炉微波的物理作用,对其在作用不同时间的煤样孔隙率,渗透容积及吸附容积作以记录分析。结果显示,随着微波作用的持续煤样的吸附容积呈先减小后增大变化趋势,另一方面,煤样的孔隙率与渗透容积和吸附容积恰恰相反,呈先增大后减小的变化趋势。在进行微波作用的过程中,三者均在某一时刻出现极值。在此极值的情况下,有利于煤中瓦斯的吸收移动及扩散。

The Unsaturated Hydraulic Parameters for Aeolian Sand

The water characteristic curve for aeolian sand in two processes of wetting and drying was obtained by the negative water column technique.The values of fitting parameters were calculated according to Van Genuchten formula and the parameters that characterized the prosperities of aeolian sand such as the unsaturated infiltration coefficient and specific water capacity were obtained.The results showed that the water characteristic curve for aeolian sand in wetting process had greater hysteresis quality than ...

Stability Analysing of Unsaturated Soil Slope

The stability of unsaturated soil slope has been the hot point recently. Especially, the seeping rainfall makes losing stability of unsaturated soil slope, and causes enormous loss to the producation and safety of other people. The seeping rainfall makes volumetric water content of unsaturated soil slope changing, and the volumetric water content has directly relationship with matric suction. And matric suction also has directly relationship with the stability of unsaturated soil slope. So the change of matric suction influence the stability changing, that is, safety coefficient has decided relationship with volumetric water content. The profile of dangerous volumetric water content curves of unsaturated soil slope has been obtained. If a volumetric water content curve of some unsaturated soil slope belongs to one of these dongerous curves, the unsaturated soil slope could be in danger. So this is called DVWCCP(dangerous volumetric water content curves profile). By monitoring the volumetric water content curves can obtain the stability information of some soil slope to serve producing and safety.

多层螺旋CT在胃癌患者术前分期诊断中的应用价值

目的:探究多层螺旋CT在胃癌患者术前分期诊断中的应用价值。方法:回顾性分析2019年1月—2023年12月咸宁市中心医院收治的50例胃癌手术患者资料,所有患者术前均进行多层螺旋CT诊断,以手术病理学为金标准,统计多层螺旋CT的诊断结果、诊断效能、灌注参数。结果:多层螺旋CT的T分期诊断准确度是94.00%、敏感度是90.00%、特异度是96.67%,N分期诊断准确度是98.00%、敏感度是95.00%、特异度是100.00%,M分期诊断准确度是100.00%、敏感度100.00%、特异度100.00%。胃癌病灶的血容量、渗透性表面容积均高于胃壁正常组织,M分期胃癌病灶的血容量、渗透性表面容积均高于N分期、T分期,差异均有统计学意义(P<0.05)。胃癌病灶、胃壁正常组织的血流量、通过时间比较,T分期、N分期、M分期胃癌病灶的血流量、通过时间比较,差异均无统计学意义(P>0.05)。结论:在胃癌患者术前分期诊断中应用多层螺旋CT,可通过灌注参数识别胃癌病灶组织和胃壁正常组织,进一步明确T、N、M分期。

微波作用对煤微观孔隙影响的研究

利用工业用微波炉对煤样进行微波作用,使用物理方法测定了微波作用不同时间下煤样孔隙率、吸附容积和渗透容积,并初步探讨了微波对煤样的作用机理。结果表明,煤样的孔隙率和渗透容积均随着微波作用时间增加呈先增大后减小变化;煤样吸附容积随着微波作用时间增加呈先减小后增大变化。微波作用到某一时刻时,煤样孔隙率、吸附容积和渗透容积出现极值,此时对于煤中瓦斯的运移、渗透和扩散较为有利。