伊丽莎白·毕肖普诗歌的生态批评解读

伊丽莎白.毕晓普是20世纪美国当代最重要、最有影响力的女诗人之一。众多的评论文章多从女性主义、新批评等视角对其作品进行深入研究。本文以生态批评为切入点,结合生态批评理论的要旨,分析其诗歌中所蕴含的生态主义思想。     

基于多维攻防博弈机制的LTE-5G网络防御算法研究

针对当前LTE-5G网络防御算法需要预设先决条件,且在多维攻击环境下难以实现防御行为自收敛等难题,提出了一种基于多维攻防博弈机制的LTE-5G网络防御算法。首先,对攻击行为进行大数据建模,综合考虑攻击行为数学分布特性,即DDos攻击特性,并精确匹配DDos攻击带宽,实现对攻击危害行为的确定性分析,提高网络主动防御性能,达到对攻击行为预分析的目的;随后,考虑到传统算法的网络收敛概率评估较差的问题,采取Q分析方式进行随机博弈,构建了Q博弈-单向数据攻击模型,成功获取单向数据攻击集合,并进行了攻击行为持续期间的纳什均衡,改善算法的网络防御效果。仿真实验证明:与当前LTE-5G网络中广泛使用的次高频载波指纹网络过滤防御算法(Secondary High Frequency Carrier Fingerprint Network Filtering Defense Algorithm,SHFCF-FD算法)、带宽峰值匹配过滤防御算法(Bandwidth Peak Matching Filtering Defense Algorithm,BPMFD算法)相比,所提算法具有更大的抗攻击带宽强与网络传输带宽,以及更低的裁决错误率低与信道误码率,具有很强的实际部署价值。     

生物质和煤炭化过程中的介电性能研究

以玉米芯、椰壳和烟煤为原料,经不同炭化温度制备出炭化焦样,利用矢量网络分析仪测定其微波介电性能,结果表明:2~18 GHz频段下,炭化温度与介电常数成正相关;不同材料在700℃下所制焦样,介电常数大小顺序为椰壳玉米芯烟煤,900℃下,椰壳烟煤玉米芯。通过XRD和FT-IR分析表征,表明焦样的石墨化度和芳香化程度是影响介电性能变化的原因。     

Semileptonic decays Bc→(ηc,J/Ψ)lv in the perturbative QCD approach

In this paper we study the semileptonic decays of B_c^-→(η_c,J/Ψ)l^-v_l. We first evaluate the B_c→(η_c,J/Ψ) transition form factors F₀(q²), F₊(q²), V(q²) and A_0,1,2(q²) by employing the pQCD factorization approach, and then we calculate the branching ratios for all considered semileptonic decays. Based on the numerical results and the phenomenological analysis, we find that: (a) the pQCD predictions for the values of the B_c→η_c and B_c→J/Ψ transition form factors agree well with those obtained by using other methods; (b) the pQCD predictions for the branching ratios of the considered decays are Br(B_c^-→η_c e^-v_e(μ^-v_μ)=(4.41_-1.09^+1.22)×10^-3, Br(B_c^-→η_cτ^-v_τ) =(1.37_-0.34^+0.37)×10^-3, Br(B_c^-→J/Ψ e^-v_e(μ^-v_μ)) =(10.03_-1.18^+1.33)×10^-3, and Br(B_c^-→J/Ψτ^-v_τ) =(2.92_-0.34^+0.40)×10^-3; and (c) we also define and calculate two ratios of the branching ratios R_ηc and R_J/Ψ, which will be tested by LHCb and the forthcoming Super-B experiments.     

Revisiting the Kπ puzzle in the pQCD factorization approach

In this paper,we calculated the branching ratios and direct CP violation of the four B→Kπ decays with the inclusion of all currently known next-to-leading order(NLO) contributions by employing the perturbative QCD(pQCD) factorization approach.We found that(a) Besides the 10%enhancement from the NLO vertex corrections,the quark-loops and magnetic penguins,the NLO contributions to the form factors can provide an additional~15%enhancement to the branching ratios,and lead to a very good agreement with the data;(b) The NLO pQCD predictions are A_(CP)~(dir)(B~0→K~+π~0)=(-6.5±3.1)%and A_(CP)~(dir)(B~+→K~+π~0)=(2.2±2.0)%,become well consistent with the data due to the inclusion of the NLO contributions.