利用弱交叉科尔效应实现多光子任意高维空间纠缠态的确定性制备

提出两种实现多光子高维空间纠缠态的制备方案.首先给出一种基于后验选择技术的实现方案,此方案以一定的概率实现.然后以基于弱交叉科尔效应的控制路径(C-path)门为基础,给出任意双光子任意维度的空间纠缠态的制备方案,并将此方案推广到任意多光子任意维度的空间纠缠态的制备.这一制备方案的最大优点在于可以确定性的得到纠缠态,并且不需要复杂的后验选择技术,可以很方便的应用于量子信息过程,同时该方案在目前的实验条件下是可行的.     

SBS改性沥青机理研究进展

介绍了沥青的特性、苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)的性能,分析了SBS与基质沥青之间的溶胀性和相容性问题,着重论述了SBS改性沥青机理的研究进展,指出机理主要分为物理共混和化学改性两类:物理共混——SBS微粒受到沥青组分中油分的作用发生溶胀而均匀分散在沥青中,SBS与沥青之间没有发生化学作用,只是一种分子间作用力;化学改性——加入添加剂使沥青和SBS之间发生加成、交联或接枝等化学反应,形成较强的共价键或离子键,改善沥青的化学性质。提出化学改性是提高SBS改性沥青路用性能的重要手段。     

基于FPGA的实时图像采集与分析系统设计

当今社会视频技术运用的越来越广泛。针对实时图像采集与分析系统对实时性要求高的特点,研究并设计了一套基于FPGA的图像实时采集与分析系统,利用在FPGA芯片上设计软硬件,速度快、稳定可靠,研发周期短等特点。整个系统以FPGA芯片为核心,辅以图像采集模块、图像分析算法、图像存储和图像分析模块。实验表明, 该系统较好地符合了系统对实时性的要求。     

羟丙基三甲基氯化铵壳聚糖的制备及其吸湿、保湿性能

抑菌活性;羟丙基三甲基氯化铵壳聚糖的制备及其吸湿、保湿性能     

线性光学实现量子普适确切态识别

给出一种量子普适确切态识别的线性光学实现方案.此方案只用到双光子的干涉和符合测量,在实验上是简单可行的.同时提出一种改进方案,通过一定量的辅助光子,使得上述方案成功概率得以提高.这一方案将可应用于量子密钥分配等安全信息交流中. 关键词： 确切态识别 线性光学     

Superadditivity with Mixed States Ensemble

Superadditivity is a special property in quantum communication theory. We present the optimal measurement for a mixed-state ensemble and calculate the amount of one-shot capacity, which is connected to the intensity of noise of the channel. Then the property of superadditivity is preserved when the mixed-state ensemble is used to transmit information.     

用振动试验方法测定羽毛球拍杆的刚度

将羽毛球拍杆简化为单自由度弹簧质量系统,用振动试验方法测出系统的固有频率,用于计算羽毛球拍杆的抗弯刚度,并以此作为评定羽毛球拍杆软硬度的指标. 振动试验方法方便、准确,可用于代替现行弹性测试法,作为测定羽毛球拍杆软硬度的标准.     

Linear Optical Realization of Qubit Purification with Quantum Amplitude Damping Channel

We provide an experimental scheme which includes the realizatlon of quantum amplitude damping channel and the optimal two-qubit purification. Moreover, we discuss the purification of arbitrary input qubits and arbitrary N qubits. Our scheme only uses linear optical elements and the proposal may be useful in transmission of photons in fibres. This scheme is feasible in the laboratory with the current experimental technology.     

Correlation and trust mechanism-based rumor propagation model in complex social networks

In real life, the rumor propagation is influenced by many factors. The complexity and uncertainty of human psychology make the diffusion model more challenging to depict. In order to establish a comprehensive propagation model, in this paper, we take some psychological factors into consideration to mirror rumor propagation. Firstly, we use the Ridenour model to combine the trust mechanism with the correlation mechanism and propose a modified rumor propagation model. Secondly, the mean-field equations which describe the dynamics of the modified SIR model on homogenous and heterogeneous networks are derived. Thirdly, a steady-state analysis is conducted for the spreading threshold and the final rumor size. Fourthly, we investigate rumor immunization strategies and obtain immunization thresholds. Next, simulations on different networks are carried out to verify the theoretical results and the effectiveness of the immunization strategies. The results indicate that the utilization of trust and correlation mechanisms leads to a larger final rumor size and a smaller terminal time. Moreover, different immunization strategies have disparate effectiveness in rumor propagation.     

CaF2对硅酸三钙的制备及其生物活性的影响

采用固相反应制备不同CaF掺量的生物活性硅酸三钙(3CaO·SiO22,C3S),并研究CaF2对C3S的制备及生物活性的影响.化学滴定、TGA/DTA、XRD、SEM和FTIR的分析结果表明,在煅烧过程中,CaF2有效的促进CaCO3的分解,并能形成低共熔化合物,促进C3S的形成;存急冷过程中,CaF2抑制CS晶型转变和分解,CaF2有效提高固相反应制备C§的纯度;模拟体液(SBD浸泡实验结果表明掺与小掺CaF2的C3s表面分别在1 d和3 d内诱导形成诱导磷厌石,这表明掺CaF2可以提高C3S的生物活性.