Efficient ternary organic solar cells with high absorption coefficient DIB-SQ as the third component

A series of organic solar cells(OSCs) are prepared with PTB7:PC_(71) BM as the host materials and DIB-SQ as the third component. The power conversion efficienty(PCE) of OSCs can be improved from 6.79% to 7.92% by incorporating 6 wt%DIB-SQ into donors, resulting from the enhanced short circuit current density(J_(SC) and fill factor(FF). The increased JSCof the optimized ternary OSCs should be attributed to the enhanced photon harvesting of teranry active layer by incorporating DIB-SQ. Meanwhile, FF of the optimized ternary OSCs should be due to the optimied phase separation. The open circuit voltage(V_(OC)) of tenray OSCs can be maintained at a constant of 0.75 V, indicating that all photogenerated holes willl be transported along the channels formed by PTB7.     

A New Lattice Model of Two-Lane Trafc Flow with the Consideration of the Honk Efect

In this paper,a new lattice model of two-lane trafc flow with the honk efect term is proposed to study the influence of the honk efect on wide moving jams under lane changing.The linear stability condition on two-lane highway is obtained by applying the linear stability theory.The modified Korteweg-de Vries(KdV)equation near the critical point is derived and the coexisting curves resulted from the modified KdV equation can be described,which shows that the critical point,the coexisting curve and the neutral stability line decrease with increasing the honk efect coefcient.A wide moving jam can be conceivably described approximately in the unstable region.Numerical simulation is performed to verify the analytic results.The results show that the honk efect could suppress efectively the congested trafc patterns about wide moving jam propagation in lattice model of two-lane trafc flow.     

A novel lattice model integrating the cooperative deviation of density and optimal flux under V2X environment

A novel lattice hydrodynamic model is proposed by integrating the cooperative deviation of density and optimal flux under vehicle to X (V2X) environment. According to the theoretical analysis, the stability conditions and the mKdV equations affected by the cooperative deviation of traffic information are explored. And the density wave, hysteresis loop and energy consumption of the traffic flow have been investigated via numerical simulation. The results indicate that the cooperative deviation of density and optimal flux can effectively alleviate the traffic congestion. More importantly, our new consideration can reduce fuel consumption and exhaust emission under the V2X environment.     

纠缠相干态的纠缠浓缩

利用线性光学元器件对光场量子态进行操纵,可以实现远程的量子纠缠调控和量子通讯.通过分析光学分束器对相干态光场的作用,发现当初始光场态是两个两部分纠缠态的直乘时,让其中的两模通过光学分束器作用后再对其进行光子计数,另外两模将会塌缩到新的纠缠态.基于这个特点,提出了一个实现部分纠缠相干态纠缠浓缩的方案.在这个方案中,两个部分纠缠相干态被用来作为量子信道,通过光学分束器作用后对光场进行光子数探测时,如果测量到光场的两模分别处于奇光子数态和零光子数态,则光场另外的两模将塌缩到最大纠缠态,从而完成纠缠浓缩的过程.计算结果表明,对于纠缠相干态,无论其初始的纠缠是多么微弱,利用这种方法总有一定的几率可以从中提纯出最大纠缠态.     

LiNbO3晶体中光折变热固定过程的准实时可视化研究

采用数字全息术对LiNbO3∶Fe晶体中高斯光束诱导的折射率变化热固定过程进行了准实时可视化实验研究.实验过程中通过在线加热的方式对光致折射率变化进行固定,采用冷光源提供的非相干白光对热固定的折射率变化进行显影.通过数值再现得到热固定过程中不同阶段的折射率变化分布,根据折射率变化的演化过程确定出了显影的最佳时间.     

SiO_2气凝胶导热机理的分子动力学模拟研究

本文采用分子动力学方法,选用Lennard-Jones势函数,对氩分子在SiO2气凝胶骨架结构间空隙中的运动进行了平衡分子动力学模拟(EMD)和非平衡分子动力学模拟(NEMD),分析其能量输运特性.结果表明:在骨架空隙尺寸为15nm条件下,气凝胶内部氩分子的扩散系数仅为同等条件下自由空间内氩分子扩散系数的50.35%,...     

68MeV~(12)C ~(27)Al,68.6MeV~(12)C ~(nat)Ca深部非弹性碰撞的研究

入射能量为69.5MeV的碳束轰击~(27)Al和~(nat)Ca靶,用△E-E计数器望远镜鉴别反应产物,测得Li、BC、B、N、O诸元素能谱,在两体反应假设下,得到了质心系能谱、角分布、E-θ平面上双微分截面d~2σ/dEdθ的等高线图。假定在断裂时刻碎片相对运动动能可以忽略,绝热近似条件得到满足,并且碎片只有旋转对称的四极形变,从而得到决定断点处碎片运动的三个方程,求解这组方程,得到断点拉长度,并得到出射碎片的总动能。计算得到的出射碎片的形变参数是在0.28—0.44之间,其全阻尼能量与实验结果基本相符。由拟合实验角分布得到的平均寿命是(4—6)×10~(-22)秒。     

A Lattice Hydrodynamic Model for Traffic Flow Accounting for Driver Anticipation Effect of the Next-Nearest-Neighbor Site

In this paper, a new lattice hydrodynamic model is proposed by incorporating the driver anticipation effect of next-nearest-neighbor site. The linear stability analysis and nonlinear analysis show that the driver anticipation effect of next-nearest-neighbor site can enlarge the stable area of traffic flow. The space can be divided into three regions： stab/e, metastable, and unstable. Numerical simulation further illuminates that the driver anticipation effect of the next-neaxest-neighbor site can stabilize tramc flow in our modified lattice model, which is consistent with the analytical results.     

会聚激光扫描铌酸锂晶体写入光波导时的最佳曝光间距

对利用激光精细加工技术在铌酸锂(LiNbO₃)晶体中写入光波导时的最佳曝光间距进行了详细地理论分析和实验研究.通过数值求解简化后的光折变动力学方程组，对会聚激光束沿不同方向扫描晶体时的最佳曝光间距进行了详细的数值模拟.结果表明：最佳曝光间距的选取与写入光束的扫描方向无关；当聚焦激光束平行于光轴扫描晶体时，得不到波导结构，但可以采用“三明治”辐照方式得到对称的折射率分布.采用会聚的绿激光束扫描掺铁铌酸锂(LiNbO₃：Fe)晶体进行了实验研究，晶体中的光致折射率变 关键词： 激光精细加工 最佳曝光间距 光波导 3晶体')" href="#">LiNbO₃晶体