水泥膨胀珍珠岩砂浆的保温试验研究与应用

荆江分洪北闸加固工程２号护坦（斜面）混凝土的保温层采用了水泥膨胀珍珠岩砂浆，并对这种材料的保温效果进行了试验研究。试验表明：水泥膨胀珍珠岩砂浆降低最高温差，减小内表温差，缩小表温变幅和防止混凝土表面裂缝效果显著。在北闸２号护坦混凝土表面铺设１万平方米保温层，获得良好效果。     

长壁机械化掘巷充填采煤围岩结构稳定性及运移规律

为解决西部生态脆弱矿区煤炭开采率低、采后环境易破坏等难题,提出了一种长壁机械化掘巷充填采煤方法。在系统阐述该技术方法的巷道布置与充填采煤工艺的基础上,分析了该技术的难点与关键。基于长壁掘巷充填采煤岩层移动特征,建立了长壁掘巷充填开采采场力学模型,推导出了采场顶板下沉方程与煤柱承受载荷计算公式,并结合极限强度理论,提出了煤柱失稳判据。以陕西榆林常兴煤矿3101工作面掘巷充填采煤为工程案例,通过充填体材料力学特性测试,优化设计了掘巷充填采煤开采方案。采用3DEC数值模拟软件对掘巷充填采煤上覆延安组层间裂隙承压水隔水层与第四系松散层孔隙潜水隔水层移动特征及稳定性进行了分析,现场应用案例表明,该技术可有效控制工作面围岩结构稳定性与上覆隔水层岩层移动,提高煤炭资源回收率,可为西部生态脆弱矿区煤炭资源开采与环境保护协调发展提供借鉴。     

综合机械化充填采煤

为了消除煤矿矸石山以及减轻对周边环境的影响,结合安全开采建筑物下大量压煤,进行了3种类型充填采煤试验。通过对不同充填介质材料实验研究,基本掌握了合理的充填材料配比,各种充填材料的压实度、流变性及风化性等力学特性;研发出采充一体液压支架充填与挤捣实装置和采充隔离密封机构等具有自主知识产权的核心技术;解决了固体输送系统中的大垂深大投量防堵、防冲击缓冲泄压等难题,研制了充填料配比、实时来料质量动态调整计算机智能控制系统;优化了充填工艺与系统成套装备等充填技术参数。     

单组份聚氨酯炮孔填塞剂应用性试验

炮孔填塞是爆破施工过程中的一个关键环节,也是践行精细爆破设计理论的重要措施。传统的炮泥填塞存在着诸多不足,为此,研制了以聚氨酯为基材的TK炮孔填塞剂,通过大量基础性能研究和隧道现场工业性试验,论证了其作为炮孔填塞材料可降低炸药单耗,提高单循环进尺和炮孔利用率,减小空气冲击波、爆破噪声等有害效应的影响,且是安全可靠的。TK炮孔填塞剂优良的填塞效果、方便快捷的施工方法及显著的经济效益,方便于在爆破工程中推广应用。     

Validation of analytical methods for nuclear spent fuel reprocessing

For more than 50 years, CETAMA, the Commission for establishment of analytical methods from the French Alternative Energies and Atomic Energy Commission, has provided Certified Reference Materials and Interlaboratory Comparisons for the development and validation of analytical methods in the nuclear field. In the future, the nuclear spent fuel reprocessing industry will require new standards and methods to comply with high content plutonium fuel and new extraction solvents. These standards and methods will have to be fully validated in order to ensure the quality of the analytical results obtained by the laboratories.In this context, a new ²⁴²Pu reference material, certified for its isotopic composition, has been recently produced. A novel statistical approach for data processing has been used and has led to a certified value of 0.985459 ± 0.000052 for the n(²⁴²Pu)/n(Pu) atomic ratio. In addition, an interlaboratory comparison has also been organized for the validation of a method for the analysis of DMDOHEMA, and its degradation products. This compound is considered as a new extractant candidate in the frame of separation processes for transmutation of long-lived radionuclides. The methodology and results obtained in both cases are presented.     

水媒管式烟气换热器材料耐腐蚀性评价

水媒管式烟气换热器在工作中面临酸露的腐蚀,换热管材料需具备耐腐蚀性.模拟了水媒管式烟气换热器的腐蚀环境,采用自行设计的浸泡试验方法对8种候选材料的耐腐蚀性进行了比较,并采用扫描电镜对材料腐蚀后的表面形貌进行了研究.结果表明,ND 钢在高浓度硫酸中的耐腐蚀性优于碳钢;不锈钢254SMO在各种浓度硫酸溶液中的腐蚀速率均较低;聚四氟乙烯塑料（PTFE）具有优异的耐腐蚀性.     

Hydrogen solubility in liquid lithium–sodium alloys (90, 50, and 20 at% Li)

Hydrogen solubility in liquid Li–Na alloys (20, 50, and 90 at% Li) at 673, 773, and 873 K was investigated by adding and extracting hydrogen through the wall of a capsule made of pure iron. Hydrogen solubility in the Li₉₀Na₁₀ alloy was almost similar to that in pure Li while for Li₅₀Na₅₀ and Li₂₀Na₈₀, it was one and two orders of magnitude smaller, respectively. No obvious difference in temperature dependence was observed, similar to the case for pure Li. Li–Na alloy can thus be a potential liquid breeding material with almost all of the advantages of the Li blanket system and free of most of its drawbacks.     

高压XLPE绝缘电力电缆外护套材料的选择

介绍了高压电力电缆外护套材料的种类,从机械性能、电性能、阻燃性能等多方面分析了各种材料的优缺点,并希望用户在选型过程中,能够根据不同的使用环境采用性能最合适的非金属护套,以保证电缆在寿命期内安全运行。     

Progress in development and application of lithium based components for Tokamak

Experiments with lithium plasma facing components (PFCs) show promising results for the operation of hot plasma facilities and the general improvement of plasma parameters. The design and development of new tokamak plasma facing material (PFM) based on lithium capillary porous systems (CPS) are described in this paper.The recent progress in the development of limiters with different kinds of CPS is relevant for protection of tokamak PFCs from damage under normal operation, ELMs and disruptions. New PFM eliminates the lithium flux into plasma, its pollution and lithium accumulation.Here we present an overview of the design and the experimental tests of the liquid lithium limiters. These limiters are based on CPS with hard matrix from stainless steel mesh, molybdenum and tungsten. Different types of limiter have been taken into account: the horizontal and vertical rail type limiters with passive and active cooling for investigation the possibility to provide the closed lithium circulation in tokamak chamber; the ring CPS-based limiter for investigation of lithium behavior in limiter scrape-off layer (SOL).Here we also present the preliminary results of the application of the cryogenic techniques for lithium removal from the chamber wall after operation in hot plasma.     

Boundary elements analysis of adhesively bonded piezoelectric active repair

This paper presents the analysis of active piezoelectric patches for cracked structures by the boundary element method. A two-dimensional boundary integral formulation based on the multidomain technique is used to model cracks and to assemble the multi-layered piezoelectric patches to the host damaged structures. The fracture mechanics behavior of the repaired structures is analyzed for both perfect and imperfect interface between patches and host beams. The imperfect interface, representing the adhesive between two different layers, is modeled by using a “spring model” that involves linear relationships between the interface tractions, in normal and tangential directions, and the respective discontinuity in displacements. Numerical analyses performed on a cracked cantilever beam repaired by single and multi-layered patches are presented. It is pointed out that the adhesive deeply influences the performances of the repair as highlighted by an increasing of the repairing voltage values with respect to perfect bonding case.