摘要：本文在海马体的启发下设计了一种与光照时长相关的记忆器件.与常规的持续性正/负电导不同,基于类网状二硫化钼沟道层的记忆器件表现出随光照时长逐渐降低的正光电导.由于光照下缺陷诱导的捕获陷阱会在阳极附近形成耗尽层,导致局部电场畸变,从而使载流子分离效率净降低,该器件表现出随光照时长先增加后降低的光响应,而且再次光激发的响应电流低于前一次光激发的电流,即再次光激发读出电流与前一次光照时长相关.因此在405 nm激光光照下该器件可用于光照时长编码和模拟压力诱导下的完整记忆行为包括记忆编码、存储和再检索.此外,通过再引入450 nm激光可以实现光照时长编码的加密与解密,同时也可以进一步模拟压力引发的相应激素对记忆的影响.

摘要：Using Schiff base as a phase transfer catalyst,ethoxycarbonyl isothiocyanate was synthesized by reacting ethyl chloroformate with sodium *** order to get the best synthetic technology,an orthogonal test(L9(34)) was *** results show that reaction temperature,reaction time,content of catalyst and molar ratio of sodium thiocyanate to ethyl chloroformate are the main factors influencing the *** four factors chosen for the present investigation are based on the results of a single-factor *** optimum synthetic technology is determined as follows:reaction temperature 35 °C,reaction time 3 h,the content of catalyst(molar fraction based on ethyl chloroformate) 1.5% and molar ratio of sodium thiocyanate to ethyl chloroformate *** the optimized synthetic technology,the experimental yield reaches 96.8%.

摘要：基于X射线纳米闪烁体的光响应疗法是一种新兴的有良好应用前景的活体肿瘤治疗策略,迫切需要开发具有高效X射线激发紫外发光性能的纳米闪烁体.然而,由于当前纳米闪烁体的X射线紫外发光性能仍较弱,实现高效的X射线激活肿瘤治疗仍然是一个巨大的挑战.为此,我们发展了一种新型的具有良好X射线紫外发光性能的Gd^(3+)/Ce^(3+)共掺杂的LiLuF4纳米闪烁体,并将其应用于活体肿瘤治疗.通过优化基质材料、掺杂剂和能量传递设计合成的纳米闪烁体,其X射线紫外发光强度比传统的Ce^(3+)单掺杂材料增强了约18倍.我们进一步将纳米闪烁体与一氧化氮(NO)前体结合以概念验证研究纳米闪烁体的应用.在X射线照射下,该纳米复合物能够可控地产生NO,并在X射线诱导的NO和放射治疗协同作用下实现了优异的抗肿瘤效果.此外,X射线激活的NO治疗可以抑制肿瘤向肝脏转移,抑制肿瘤再生,延长小鼠存活率.这项工作有望推动纳米闪烁体的发展及其在活体深层组织疾病治疗中的应用.

摘要：For a series plug-in hybrid electric vehicle,higher working efficiency can be achieved by the drive system with two small motors in parallel than that with one big motor ***,the overly complex structure will inevitably lead to a substantial increase in the development *** improve the system price-performance ratio,a new kind of series-parallel hybrid system evolved from the series plug-in hybrid system is *** to the technical parameters of the selected components,the system model is established,and the vehicle dynamic property and pure electric drive economy are *** on the dynamic programming,the energy management strategy for the drive system under the city driving cycle is developed,and the superiority validation of the system is *** the studied vehicle driven by the designed series-parallel plug-in hybrid system,compared with the one driven by the described series plug-in hybrid system,the dynamic property is significantly improved because of the multi-power coupling,and the fuel consumption is reduced by 11.4%with 10 city driving *** a word,with the flexible configuration of the designed hybrid system and the optimized control strategy of the energy management,the vehicle performance can be obviously improved.

摘要：研究温度对新型体心立方(BCC)基Fe_(3.5)Cr_(1.5)NiAl_(0.8)多组元合金(MCA)中有序椭圆状B2-NiAl纳米析出相的显微组织稳定性和力学性能的影响。采用XRD、EBSD、EPMA和TEM等检测方法对该多组元合金的显微组织和物相组成进行表征。结果表明,所设计的高含量椭圆状B2纳米析出相与BCC基体完全共格且能在1073 K高温下保持稳定,平均粒径为245.509~251.328 nm。铸态和热处理态(873 K≤T≤1073 K)合金具有独特的共格结构,这是由于低错配度的共格析出强化机制可使合金具有较高的屈服强度(809.2~1164.1 MPa)。随着热处理温度的进一步提高(1173 K≤T≤1273 K),B2纳米析出相的平均粒径逐渐粗化,载荷传递强化机制对其屈服强度提高起主要作用。

摘要：A critical safe distance(CSD)model in V2V(vehicle-to-vehicle)communication systems was proposed to primarily enhance driving safety by disseminating warning notifications to vehicles when they approach calculated *** elaborately analyzing the vehicular movement features especially when braking,our CSD definition was introduced and its configuration method was given through dividing radio range into different communication *** on our definition,the needed message propagation delay was also derived which could be used to control the beacon frequency or ***,the detailed CSD expressions were proposed in different mobility scenarios by fully considering the relative movement status between the front and rear *** results show that our proposed model could provide reasonable CSD under different movement scenarios which eliminates the unnecessary reserved inter-vehicle distance and guarantee the safety at the same *** compared time-headway model always shows a smaller CSD due to focusing on traffic efficiency whereas the traditional braking model generally outputs a larger CSD because it assumes that the following car drives with a constant speed and did not discuss the scenario when the leading car suddenly *** from these two models,our proposed model could well balances the requirements between driving safety and traffic throughput efficiency by generating a CSD in between the values of the two models in most cases.

摘要：A new approach which adopted the idea of coupling bionics to improve erosion resistance was presented, by taking the desert scorpion as the research object. The anti-erosion characteristic rules and mechanism of desert scorpion's surface under the dynamics effect of gas/solid mixed media were researched, especially the comprehensive influence mechanism of surface morphology, microstructure, creature flexibility and many other factors was studied. Simulation by CFD software was applied to predict the relative erosion severity. Samples with the coupled bionic configurations and flexibility were produced. Experiment optimum design theory was employed to design experiment scheme. Silica sand of particle size of 105-830 m was used as the erodent. The erosion tests were carried out to validate the simulation results obtained. It is shown that the predicted results are in agreement with those obtained from the experiment. And contrast tests were carried out at the best and worst test points of erosion resistance for four samples. Contrast tests show that the erosion resistance trend occurs in such order with the best erosion resistance as coupling sample, groove, smooth and flexibility, and smooth, and the increasing rate of erosion resistances in sequence of 12.08%, 8.87%, 6.03% in the best test point. But in the poorest point, the increasing rate of erosion resistance is in sequence of 15.64%, 9.53%, 6.59%. The morphologies of eroded surface were examined by the scanning electron microscope, and the possible wear mechanism was discussed.

摘要：通过实验设计阐明LPSO相对镁合金腐蚀行为的影响。按照形成18R-LPSO相的最小结构单元,即Zn/Y=3/4(摩尔比),设计4种不同LPSO相体积分数的Mg-Zn-Y合金,对比研究4种合金的显微组织和腐蚀行为。结果表明,合金主要含有α-Mg和18R-LPSO相,18R-LPSO相的体积分数随着Zn和Y含量的增加而增加。4种合金中18R-LPSO相的体积分数依次为16.55%、34.45%、54.24%和70.36%,18R-LPSO相的空间分布也由离散块状变为连续网络状。当LPSO相的体积分数在50%左右时,合金的耐蚀性最好,体积分数大于或小于50%都会导致合金耐蚀性能降低。

摘要：高能量密度的锂离子电池先进电极材料的开发,依赖于对材料在电池循环中的运行和失效机制的理解.本文使用原位高分辨TEM技术跟踪了Sb_(2)Se_(3)单晶锂化/脱锂过程中的相变,并揭示了反应界面处的电化学-力学耦合.这种电化学-力学耦合效应对锂化动力学具有复杂的相互作用,并在反应前端引起各种类型的缺陷,包括位错对、反相边界和裂纹.另一方面,形成的裂缝和相关缺陷为锂离子的快速扩散开辟了道路,并在扭曲的反应前沿引发高度各向异性的锂化,从而在无定形Li_(x)Sb_(2)Se_(3)中形成可能“失效”的Sb_(2)Se_(3)畴.我们对Sb_(2)Se_(3)电化学过程机理的详细研究有助于更合理地设计和制备高容量电极材料.

摘要：A new integer linear program(IIP)formulation was developed to solve the problem of shared cyclesdesign for optical networks with and without wavelength *** studies show that theshared cycles design requires much lower redundancy compared with p- cycle design when the maximumnumber of spans allowed in the cycles is relatively small,but the difference in the redundancy betweenthe two designs becomes smaller or disappears as the maximum number of spans allowed in the cycles in-creases.