油管传输射孔(TCP)用尾声信号弹的研究

针对深井油管传输射孔作业中TCP监测识别系统无法监测到尾声信号弹发出的震动信号,同时存在尾声信号弹造成遇卡事故等问题,对尾声信号弹结构进行研究。通过ANSYS LS-DYNA仿真分析和地面试验验证,确定主装药采用分散装药,相比集中装药减轻了爆炸产物对本体的冲击,提升了主装药装药量。此外,本体采用非对称圆形泄压孔设计方案(一侧为φ8mm圆孔、另一侧为大于φ14mm圆孔)。地面试验结果表明该设计的外径胀大尺寸满足要求,有效减少了尾声信号弹的爆炸碎屑,降低了射孔管串在上提时遇卡的风险。大庆油田的使用效果说明其有效提升了TCP监测系统监测的成功率。     

Evacuation of a Metro Train in an Underground Rail Transportation System: Flow Rate Capacity of Train Exits,Tunnel Walking Speeds and Exit Choice

Including in total 135 participants in the ages 19–69 years (recruited from the general public), an unannounced full-scale field evacuation experiment was performed in the Stockholm underground metro system on the night between October 17 and 18, 2014. The purpose was to collect data on the flow rate of people in train exits during the evacuation of a train in a tunnel and on the walking speed of people when moving long distances on an uneven surface in a tunnel, and to study exit choice and behaviour during an evacuation. Consequently, the experiment involved the evacuation of a rail car (a Bombardier C20 train) in a tunnel as well as the subsequent evacuation of the tunnel itself; the latter meant that the participants either could evacuate to the closest station (~400 m) or to an available emergency exit (~200 m). Among other things, the experiment demonstrated that the averaged flow rates of people in the train exits varied between 0.19 p/s and 0.22 p/s (0.14–0.16 p/m s when considering the train exit width of 1.4 m) and that the averaged walking speeds in the tunnel varied between 1.1 m/s and 1.2 m/s (no smoke present). Furthermore, all 135 participants found and used the available emergency exit, which had been equipped with a technical system consisting of a loudspeaker that broadcasted a combined alarm signal and a pre-recorded voice message.     

Feature analysis of women's wedding dresses in new,style weddings in the Wu culture region in modern times北大核心CSCD

To further clarify the features of wedding dresses in new, style weddings in cities and towns of the Wu culture region, the author sorted out and made a statistical analysis of modern journals and periodicals as well as conducted a comparison in combination with diaries of celebrities and novels in modern times to collect 368 wedding photos in total in the Wu culture region. The analysis results indicate that wedding dresses in the Wu culture region were mainly of modified styles from 1859 to 1949, the development of wedding dresses went through the stages of unitary styles, mixed styles and diversified styles, in each of which there were also representative regular ways of matching. In general, wedding dresses were in simple, elegant and delicate styles, and the silhouettes kept up with popular western styles, showing a high level of acceptance of foreign cultures. The colors of wedding dresses tended to combinations of light colors, while traditional colors were gradually reduced. Besides, patterns of flowers and plants with thin stems and leaves were mainly used to decorate wedding dresses, showing the distribution features of scattering and covering. © 2018 China Silk Association. All rights reserved.     

金沙江乌东德水电站大坪地滑坡稳定性研究

介绍了大坪地滑坡区的地形地貌与地层岩性,阐述了该滑坡体的变形特征,结合大坪地滑坡的计算模型,分析了库水升降作用对滑坡稳定性的影响,该分析成果将对该库区的滑坡防治提供一定的参考。     

Column Kinetic Tests Assessing Geochemical Behavior of Mine Wastes in the Jerada Coal District (Morocco)

The Jerada anthracite mine in Morocco was abandoned in 2001 after producing approximately 20 million tonnes of solid waste. The acid generating potential of these wastes was determined by performing tests on five samples collected from relatively older and more recent waste deposits. No carbonate minerals were identified. Pyrite was the only sulphide mineral observed and much of it had been completely transformed into Fe-oxides. Analysis of the waste indicated low levels (<1 %) of Ca and Mg, while Fe and Al concentrations generally exceeded 5 %. Modified Sobek static tests and column kinetic tests were conducted for 24 months. The static test results were not conclusive (20 <net neutralising potential <20 Kg CaCO₃/t). Leachates from the kinetic tests for three of the five samples showed an initially acidic pH, while those of the remaining two became acidic by the end of the tests. Sulfate concentrations (SO₄ ^2?) decreased over time from 5000 to 200 mg/L.     

Cerium Effect on the Phase Composition and Crystallization Behavior of Aluminum Casting Alloys Based on the Al–Mg–Si System

Russian Journal of Non-Ferrous Metals - Using a Thermo-Calc software package (TCAl4.0 database), unexplored data concerning the phase composition and crystallization behavior of...     

Grain Refinement of Casting Aluminum Alloys of the Al–Mg–Si System by Processing the Liquid Phase Using Nanosecond Electromagnetic Pulses

Russian Journal of Non-Ferrous Metals - In this paper, using the AA 511 alloy of the Al–Mg–Si system as an example, it is shown that the irradiation of aluminum melts with nanosecond...     

西南某边坡变形监测分析

以云贵高原某边坡工程为例,通过对工程的基本地质条件进行分析,采用地表观测墩、深部位移等监测手段,探讨了坡体的变形情况,为边坡的信息化施工提供了可靠的依据。     

构建具有民俗文化的地域景观——以西昌邛海缸窑湾度假村景观规划设计方案为例

民俗文化是地域景观的构成要素,民俗文化的传承对展现地域文化具有重要的意义,在城乡建设中对民俗风情的探索已经成为相关领域研究的热点。本文以西昌邛海缸窑湾度假村景观规划设计方案为例,通过对当地民俗文化从精神层面的解析,提炼成方案设计的手法,探讨如何在地域景观设计中更好地融入民俗文化要素。