摘要：越江公路盾构隧道浅埋段地温场演化将影响隧道穿越的江滩区域的工程地质条件。基于有限差分法建立了南京长江隧道的数值模型,分别将实测地表温度和管片内侧温度作为地层外部交变热源与内部交变热源,对隧道浅埋段典型断面地温场的演化过程进行了模拟分析。结果表明:隧道与土体间的热交换作用使隧道周围的初始恒温地层转变为年变温地层。在高温期,隧道向周围土体传热;在低温期传热方向相反。隧道周围及两孔间存在显著变温区,其最大温升值达7.14℃,年波动最大峰谷值接近10℃。该显著变温区位于距隧道外壁5m以及两孔之间的区域。其地温场在隧道运营20a后可达到初步稳定。建立了该显著变温区内地温场的年际波动模型,据此可估算出隧道周围土体不同距离处的年际温度值,该模型可为火灾等极端传热条件下估算隧道浅埋段地温场提供初始值。

摘要：Considering the coupled heat transfer effect induced by parallel cross-river road tunnels, the long-term soil temperature variations of shallow sections of cross-river tunnels under the river beach are predicted using the finite difference method for numerical simulation. The boundary conditions and the initial values are determined by in situ observations and numerical *** simulation results indicate that the ultimate calculated steady heat transfer time is 68 years, and most of the heat transfer is completed in 20 *** initial constant temperature soil surrounding the tunnels is transformed to an annually variable *** obvious temperature-varying region of the surrounding soil is discovered within 5 m from the tunnel exterior, as well as within the entire range of soil between the two *** maximum temperature increase value reaches 7.14 ℃ and the maximum peak-to-valley value of annual temperature increase reaches 10 ℃.The temperature variation of soils surrounding tunnels below 10 m is completely controlled by the heat transfer from the *** coupled heat transfer effect is confirmed because the ultimate steady temperature of soil between the two tunnels is higher than the ones along other ***, the regression model comprising a series of univariate functions is proposed for the annual soil temperature fluctuation estimation for the locations varied distances around the *** investigation is beneficial to gain an insight into the long-term variation tendencies of local engineering geological conditions of the river beach above shallow sections of the cross-river road tunnels.

摘要：提升对电磁环境精准监控的能力,确保发射任务安全,是航天器发射场迫切需要解决的问题。本文在分析航天发射场现有电磁环境监测现状和需求的基础上,引入网格化技术,提出发射场网格化电磁环境监测系统设计方案。对发射场网格化电磁环境监测系统的拓扑结构、功能架构以及工作模式进行了设计,并针对网点布局、信号定位等关键技术问题给出了解决策略。最后分析了网格化技术在航天发射场运用的技术优势,为后续发射场电磁环境监测网络建设提供了参考。

摘要：为了探究宁波平原第四纪沉积环境水动力条件和沉积相的演化情况,运用Mastersizer 2000激光粒度仪对宁波平原第四纪钻孔粒度样品进行测定.通过计算各粒度参数、绘制粒度频率分布曲线和概率累积曲线,确定了钻孔地层第四纪以来经历的水动力变化过程,即高能中能交替—高能—中高能—中低能—中能—高能—低能.同时,还确定了沉积相的变化过程,即河流及间歇性洪积—河漫滩—滨海—滨海沼泽—浅海—滨海沼泽—河流—浅海.

摘要：马克思和恩格斯对文学和艺术的生产显示出了持续不断的兴趣,但是尽管在他们的著作中存在着许多暗示和例证,但他们都没有对艺术问题进行专门深入的研究。尽管他们也许附带提到或研究了艺术问题(《神圣家族》中的欧仁·苏)。

摘要：为了解大学生对红色旅游的需求,探寻新疆红色旅游发展中存在的问题,推动红色旅游的可持续发展,文章采用问卷的方式对学生开展调查。调查结果显示,在受访学生中对旅游中的红色文化感兴趣的大学生占比86.42%,92.72%的大学生参与过红色旅游,60.18%的大学生认为大部分学生对红色旅游有需求。通过对调查结果的分析,文章从加强宣传力度、优化旅游体验、培养导游人才、设计红色旅游研学路线和红色旅游与高校教育融合发展等五个方面提出对策,以期促进红色旅游的发展。