摘要：Two-photon photopolymerization （TPP） with femtosecond laser is a promising method to fabricate threedimensional （3D） photonic crystals （PCs）. Based on the TPP principle, the micro-fabrication system has been built. The 3D woodpile PCs with rod space of 2000 nm are fabricated easily and different defects are introduced in order to form the cross-waveguide and the micro-laser structure PCs. Simulation results of the optical field intensity distributions using finite-difference time domain （FDTD） method are given, which support the designs and implementation of the PC of two types in theory.

摘要：The ZDPS-1A pico-satellite designed in Zhejiang University with a mass of 3.5 kg and a power consumption of less than 3.5 W is the smallest satellite in china up to now. The housekeeping system (HKS) is the core part of ZDPS-1A. The reliability of HKS has an important influence on the safety of the satellite. Traditional fault-tolerant methods do not apply to ZDPS-1A due to such pico-satellite characteristics as light weight, compactness in size, energy saving, and high integration. This paper deals with a highly-reliable, low-cost design for HKS using industrial devices. The reliable strategies of HKS include a dual modular redundancy scheme, CPU warm backup, a static triple modular redundancy scheme, and two-level watchdogs. Recursive experiments, special tests, and environmental tests show that this system meets the design target. This design has already been applied to ZDPS-1A, which was launched to execute in-orbit tasks on Sept. 22, 2010. To date, the satellite has been in a proper state for more than 15 months.

摘要：Cooling water is an important part in a Spallation Neutron Source target cooling system, but the unstable vortexes at the exits of the slits between every two tungsten target slices have a negative impact on the stable running of the target system. We apply the field synergy principle for fluid flow to obtain the optimal flow field, which has a uniform velocity distribution without eddy, and then, optimize the geometrical structure of the cooling water flow channel based on the optimal flow field. The results show that when the cooling water flows in the optimized channel, the eddy sizes decrease, the time fluctuations of velocity and pressure almost vanish, and the volume flow rates of the cooling water in each parallel slit are uniform. Therefore, it effectively improves the running stability of the target system with the premise of satisfying the target heat load.

摘要：Umbrella-shaped assembly of cylindrical fins is optimized by adopting analytical method and taking dimensionless mean thermal resistance (MTR) as performance index. The optimal construct of umbrella-shaped assembly is obtained. The results show that the heat conductance performance of the assembly becomes ever worse with ever greater number of elemental cylindrical fins,the umbrella-shaped assembly reduces to cylindrical fin in some values of design parameters,and the diameters’ dependence on design parameters is weak for the optimized assembly. An equivalent thermal resistance defined based on entransy dissipation rate (EDR) reflects an average heat transfer effect of the assembly. The constructal design corresponding to the minimum EDR (or MTR) should be adopted for designing an assembly of fins in engineering at the limit safe condition.

摘要：Steam generator is optimized by applying entransy dissipation extremum principle and constructal theory and adopting analyti-cal *** obtained results show that the optimal spacing between adjacent tubes,the mass flow rate of gas and the maximum entransy dissipation rate all depend on the dimensionless diameter of one tube,the dimensionless pressure difference number and the dimensionless length of flow channel of *** the three dimensionless groups,the optimal numbers of riser tubes and downcomer tubes and their summation all depend on the dimensionless height of one *** maximum entransy dissipation rate increases as the pressure difference that drives the gas flowing increases,and as the diameter of one tube and the length of flow channel both *** mean heat flux in the heat transfer process of hot gas grows greatly,and the performance of the system is *** with the optimal construct with heat transfer rate maximization,the optimal construct with entransy dissipation rate maximization can improved the heat transfer effect of the steam generator more.

摘要：利用递推格林函数方法,我们研究了褶皱石墨带的电子输运性质.当石墨带具有褶皱时,对于锯齿型石墨带,在第一个范霍夫奇点内,发现了电导隙和伴随着电导振荡的微带.然而,对于金属性扶手型石墨带,在费米能附近仅发现了电导隙,说明扶手型石墨带发生了金属-半导体转变.随着石墨带的褶皱加强,无论是锯齿型还是扶手型石墨带,平均电导都逐渐减小,并趋于0.结果有利于我们理解真实构型石墨带的电子输运性质,并且有助于设计基于石墨带的纳米器件.

摘要：可降解医用镁合金在骨科领域显示出良好的应用前景.为了保证镁合金的生物相容性,本文设计了全营养元素组成的Mg-Zn-Ca合金,研究了其体内外腐蚀及生物相容性.Mg-Zn-Ca合金在五种模拟体液中的腐蚀测试结果表明在Hank’s和MEM中添加血清能够降低合金腐蚀速度,并提高腐蚀均匀性.血清浓度越高,合金腐蚀速率越低.Mg-Zn-Ca合金在MEM+10%FBS溶液中腐蚀速率低,腐蚀形貌均匀.直接法和间接法的细胞实验结果均显示Mg-Zn-Ca合金具有良好的细胞相容性.动物实验结果表明,Mg-Zn-Ca合金在小鼠骨髓腔内逐步降解,4周后残余40 vol.%.micro-CT和组织学观察显示植入体周围有新骨形成,且随着植入时间延长,皮质骨厚度增加.因此,挤压态Mg-Zn-Ca合金具有良好的生物相容性,有望用作骨科植入材料,但是其体内降解速率还应进一步降低.

摘要：CTL模型检测技术已被广泛应用于形式验证领域。交互时态逻辑(ATL)是对CTL的一个扩展,用于表达多主体博弈结构上的性质。ATL使用合作算子来表达多个主体能够通过合作保证系统的设计目标。在实际应用中,我们需要知道主体的行动与系统的输出状态之间具有因果关系。在本文中,我们通过引入新的模态算子扩展ATL,使得这种因果关系得到表达。我们使用两种方式的扩展。其中之一是从主体的能力出发,直观上,如果一些主体可以通过合作的行动来保证系统进入某个状态,同时,这些主体也可以通过合作的行动保证系统不进入这个状态,则这些主体的行动与该系统状态间具有更强的因果关系。我们使用的另一种方式是从系统状态出发。我们考虑要想使系统进入某状态,哪些主体的行动的必不可少的,哪些主体的行动是充分的但非必要的条件。在本文中,我们扩展后的逻辑CATL和SATL表达力强于ATL,但计算复杂性与ATL相同。