摘要：基于虚时间演化法,实现基态Wigner函数的数值计算。考虑到Wigner函数是一个高维相空间函数,通过引入合适的谱方法以降低问题的维度,并处理所得控制方程中的全局算子。首先,从Schr9dinger波函数的虚时间演化方程出发,推导得到适用于Wigner函数的控制方程。然后,根据方程中卷积项的不同表达,基于简化Grad矩方法和傅里叶伪谱方法,分别设计两类p空间上的离散方法,并阐述其中的求解细节。此外,基于所提出的数值框架,探讨基于密度泛函理论的基态计算。其中,针对简化Grad矩方法下的密度泛函计算,提出一类密度高阶导数的重构方式。最后,数值算例展示所提方法的有效性,以及方法在多体问题中的应用前景。

摘要：环保指的是节能环保,是以节能环保为基础,用先进的技术、节能的设备、优质的产品和优良的服务为依托,细化成自己特色的市场。在环保市场,起主导地位的是机制,它调动了市场的各种关系能动性、积极性,优化了资源的配置,解决了资源和环保矛盾,推动了环境与发展的共赢。

摘要：治理雾霾是系统工程,涉及到各种科学及多个单位,需要多部门配合的管理体系。分析了治理雾霾的现状和主要问题,体制中部门职能交叉、各区域合作不畅,监测数据混乱等突出体制问题,明确环保监管为基础,党政同责为手段,不断健全治理雾霾的环保管理体制。

摘要：The zirconium(Zr)alloy fuel cladding is one of the key structural components of a nuclear reactor and the first and most important line of defense for accommodating fission *** the operation of nuclear reactors,Zr alloy fuel cladding is subjected to extreme harsh environments,such as high temperature,high pressure and high flow rate for a long period of *** wear and corrosion resistance of Zr alloys is important for the safe operation of nuclear *** modification can effectively improve the corrosion and wear resistance of fuel *** with coating technology,nitriding technology does not have problems for bonding between the coating and the *** research on surface nitriding of Zr alloys mainly focuses on plasma nitriding and ion implantation *** on laser nitriding of Zr alloy surfaces and their fretting wear characteristics is *** this study,the surface of Zr alloy was treated with laser nitriding at different laser *** microstructure of Zr alloy treated with different laser energies and its fretting wear performance were *** results showed that after nitriding with different laser energies,the surface of the Zr alloy showed a typical molten state after melting,vaporizing and cooling under the thermal effect of the laser,and this state was more obvious with the increase of the laser *** the same time,doping of N atoms and formation of the ZrN phase led to different cooling rates in the molten zone that produced large tensile stresses after *** led to cracks on the surface of Zr alloys after laser nitriding at different energies,and the crack density increased with increasing laser *** also led to an increase in the surface roughness of the Zr alloy with increasing laser energy after laser nitriding *** to the presence of water in the industrial nitrogen,nitrides were generated on the surface of the sample along with some *** the laser

摘要：在可控气氛微动磨损试验设备上,开展了904L不锈钢在不同温度和环境介质(常温大气、常温二氧化碳、350℃大气、350℃二氧化碳)下的微动磨损试验.分析了其摩擦学界面损伤机制和摩擦化学行为.结果表明,常温条件下微动运行于完全滑移区,磨损机制主要是分层剥落和氧化磨损;350℃条件下微动运行于混合区,大气环境下的磨损机制主要是黏着磨损和氧化磨损,二氧化碳环境下的磨损机制主要是黏着磨损.常温时二氧化碳较大气环境的磨损量减小,温度升高至350℃时磨损量显著减小.

摘要：在LTE-A标准中,下行用户级的解调参考信号会与物理广播信道以及主、辅同步信号等冲突。终端可以不接收冲突的资源块甚至整个PDSCH/ePDCCH数据,这将对LTE-A下行系统性能产生较大影响。针对资源冲突情况,系统分析了基站和终端多种解决策略以及相应的理论性能。通过性能仿真给出了冲突解决策略的链路级性能增益。结合仿真结果,建议设备和终端共同改进来约束终端行为并提高性能。

摘要：依据设计要求与工程特点,开展曲线斜拉桥施工测量控制网、施工测量技术、施工测量最佳时段的研究。研究与施工测量实际相结合,保证了清河曲线斜拉桥安全施工。