摘要：我们将实体嵌入问题看作同时完成两个不同但相关的嵌入任务(实体嵌入和关系嵌入)的联合优化问题,并在联合嵌入框架下求解该问题。在该嵌入框架下,我们设计了联合评分函数,用以对实体和关系间的相关性实例进行量化评价,并将评分函数融入最大间隔学习方法中,使用知识库中的上下文信息学习实体与关系的嵌入向量。通过求解联合优化问题,我们的设计有效地表达了嵌入空间的固有拓扑结构。实验结果证实了我们的嵌入框架在表达不同关系的语义相关性和进行知识推理中的关系预测时的有效性。

摘要：The objective of the present paper is to study the sweep effect on the blade design performance of a transonic compressor *** baseline to be modified and swept is a designed well efficient transonic single rotor compressor. The first part of the present study is concerning the sweep effect with straight leading *** this case fixing the hub section the swept blade is formed by tilting the leading edge with whole blade forwards and backwards *** second part is to use an optimization strategy with simple gradient-based optimum-searching method and multi-section blade parameterization technique to search and generate an optimal swept rotor with curved arbitrary leading *** adiabatic efficiency is a little bit greater than that of the reference un-swept rotor.

摘要：基于团簇式设计方法,采用激光增材制造工艺制备一种近α型Ti-7Al-2V合金,其比强度优于Ti-6Al-4V合金的比强度。该合金的成分式为α-{[Al-Ti_(12)](AlTi_(2))}_(15)+β-{[Al-Ti_(14)](V_(3))}_(2):其特征在于α结构单元比例提高为15/17(相对于Ti-6Al-4V的12/17),使合金成分偏向α-Ti;通过V元素合金化,提高了β-Ti结构单元稳定性。该合金具有良好的激光增材制造成形性。沉积态下,该合金的显微组织由细网篮组织区、粗网篮组织区和超细α魏氏组织区构成。其中,粗网篮组织区的表面粗糙度明显低于细网篮组织区和超细α魏氏组织区的表面粗糙度。细网篮组织区的α相分布相比于粗网篮组织区更加均匀。该合金的抗拉强度为971~1005 MPa,屈服强度为891~921 MPa,伸长率为4.5%~6.6%,均与Ti-6Al-4V的相近,尤其是该合金的比强度为224~232 kN·m/kg,优于Ti-6Al-4V合金的比强度。

摘要：In this work, a 90-nm critical dimension （CD） technological process in an ArF laser lithography system is simulated, and the swing curves of the CD linewidth changing with photoresist thickness are obtained in the absence and presence of bottom antireflection coating （BARC）. By analysing the simulation result, it can be found that in the absence of BARC the CD swing curve effect is much bigger than that in the presence of BARC. So, the BARC should be needed for the 90-nm CD manufacture. The optimum resist thickness for 90-nm CD in the presence of BARC is obtained, and the optimizing process in this work can be used for reference in practice.

摘要：Using time-dependent multilevel approach （TDML）, this paper studies the dynamics of coherent control of Rydberg lithium atoms and demonstrates that Rydberg lithium atoms can be transferred to states of higher principal quantum number by exposing them to specially designed frequency-chirped laser pulses. The population transfer from n=70 to n=75 states of lithium atoms with efficiency more than 90% is achieved by means of the sequential adiabatic rapid passages. The results agree well with the experimental ones and show that the coherent control of the population transfer from the lower n to the higher n states can be accomplished by the optimization of the chirping parameters and the intensity of laser field.

摘要：高熵合金近年来在电催化领域广受关注.由于其四大“核心效应”,即高熵效应、晶格畸变效应、迟滞扩散效应和鸡尾酒效应,高熵合金在诸多电催化反应中展现出了优异的活性和选择性.然而在已报道的文献综述中,有关其优异性能的理解以及合理设计的系统性总结仍然具有局限性.本文不仅综述了高熵合金电催化剂的特点和设计准则,还对其应用的最新进展进行了系统性的归纳整理,对高熵合金未来的发展具有指导意义.首先我们从多个角度阐明了高熵合金作为一种优异电催化剂的原因,包括其出色的机械性能、可优化的结构和组成、大量具有高本征活性的活性位点,以及出色的稳定性.为了进一步深入对高熵合金电催化剂的理解,我们还从设计准则、元素选择,以及理论计算预测材料性质等角度,详细介绍了高熵合金的合理设计.随后,我们介绍了高熵合金电催化剂在电解水、有机小分子氧化、燃料电池和碳/氮基转化反应的最新研究进展,其中还包括了一系列理论计算和原位表征在理解催化反应机理方面的应用.最后,我们展望了高熵合金电催化剂在未来发展中面临的挑战和机遇.

摘要：Determination of collapse load-carrying capacity of elasto-plastic material is very important in designing *** problem is commonly solved by elasto-plastic finite element method(FEM).In order to deal with material nonlinear problem involving strain softening problem effectively,a new numerical method-damped Newton method was *** iterative schemes are discussed in detail for pure equilibrium *** the equilibrium model,the plasticity criterion and the compatibility of the strains are verified,and the strain increment and plastic factor are treated as independent *** avoid the stiffness matrix being singularity or condition of matrix being ill,a damping factor α was introduced to adjust the value of plastic consistent parameter automatically during the *** to the algorithm,the nonlinear finite element program was complied and its numerical example was *** numerical results indicate that this method converges very fast for both small load steps and large load *** with those results obtained by analysis and experiment,the predicted ultimate bearing capacity from the proposed method is identical.

摘要：Audible noise from high voltage transmission lines’ corona discharge has become one of the decisive factors affecting design of high voltage transmission lines, thus it is very important to study the spatial propagation characteristics of audible noise for its accurate pre- diction. A calculation model for the propagation of audible noise is presented in this paper, which is based on the basic equation of the sound wave and can involve the influences of the atmosphere absorption and ground effects. The effects of different ground impedances and the atmospheric attenuation on the distribution of sound pressure level are discussed in this paper. The results show that the atmospheric absorp- tion may increase the attenuation of the audible noise, and the ground surface affects both the amplitude and phase of the sound. The spatial distribution fluctuates considering the ground effects. The atmospheric attenuation and the ground effect are closely related to the frequency of the noise. In the frequency range of the audible noise, the influence of atmospheric attenuation on the spatial propagation characteristics is more obvious in high frequency while ground has significant influences in low frequency.

摘要：The problem of non-fragile H∞ filtering for a class of linear systems described by delta operator with circular region pole constraints is *** purpose of the paper is to design a filter such that the error filtering system not only satisfies the prescribed circular pole constraints or D-stability constraint,but also meets the prescribed H∞ norm constraint on the transfer function from the disturbance input to the estimation *** filter gain to be designed is assumed to have multiplicative gain variations.A sufficient condition for the existence of such a filter is obtained by using appropriate Lyapunov function and linear matrix inequality (LMI) technique.A numerical example is provided to demonstrate the effectiveness and less conservativenes of the proposed design.

摘要：High-speed trains have very complex running environments,which contain single-train running in open air,two-trains passing by in open air,single-train running in tunnel and two-trains passing by in *** the environment wind appears,crosswind effects must be *** design of high-speed trains mainly aims at the drag,lift,moment,impulse pressure waves,aerodynamic noise,*** typical running *** the paper,the aerodynamic design processes of CRH380A and 380B are introduced and the aerodynamic performances of different designs are analyzed and *** tunnel experiments and running tests indicate that the new generation of high-speed trains have excellent aerodynamic performances.