Security Simulation of Continuous-Variable Quantum Key Distribution over Air-to-Water Channel Using Monte Carlo Method

Considering the ocean water＇s optical attenuation and the roughness of the sea surface, we analyze the security of continuous-variable （CV） quantum key distribution （QKD） based Mr-to-water channel. The effects of the absorp- tion and scattering on the transmittance of underwater quantum channel and the maximum secure transmission distance are studied. Considering the roughness of the sea surface, we simulate the performance bounds of CV QKD with different wind speeds using the Monte Carlo method. The results show that even if the secret key rate gradually reduces as the wind speed increases, the maximum transmission distance will not be affected obviously. Compared to the works regarding short-distance underwater optical communication, our research represents a significant step towards establishing secure communication between air platform and submarine vehicle.

Hybrid Dissolved Gas-in-Oil Analysis Methods

Dissolved gas analysis is the most widely used diagnostic test in power transformers. The aim of this paper is to introduce the dissolved gas analysis (DGA) methods able to diagnose the transformer conditions. The faults cause the transformer oil, pressboard, and other insulating materials to decompose and generate gases, some of which dissolve in the oil. The results of DGA must be accurate if faults are to be diagnosed reliably. There are different established methods used in industry for interpreting DGA results. We will compare the result of IEEE Key Gas Methods and Rogers’ Ratios. The transformer conditions are evaluated by the Key Gas Method with total combustible gas method (TCGM) and then verified by the Rogers’ Ratios. As result, the aging pattern and trend of the power transformer deterioration can be determined. The 30 sample data from IEEE with known faults and dissolved gas concentrations were used as the basis of comparison.

厚朴汤剂对变形链球菌影响的实验研究

目的探讨厚朴汤剂对变形链球菌的影响,为厚朴作为防龋药物的临床应用提供实验依据。方法选取120只SD大鼠,采用随机数字表法分为A、B、C、D组,每组各30只。SD大鼠在出生21~23 d给予含广谱抗生素的致龋饲料,其他时间的饲料中不添加抗生素。24~27 d连续4 d给予大鼠口腔内接种变形链球菌。出生后28 d A、B、C、D组分别使用厚朴汤剂(0.3 mL)、氟化钠溶液(0.3 mL)、0.2%酸性氟磷酸钠(0.3 mL)、蒸馏水(0.3 mL)处理,1次/d,连续处理60 d。比较各组变形链球菌菌落计数,并采用keyes龋齿记分法观察各组处理方式对SD大鼠磨牙龋龋齿损害情况。结果A组变形链球菌菌落计数低于B组、C组、D组,B、C组变形链球菌菌落计数低于D组,差异有统计学意义(P<0.05);B、C变形链球菌菌落计数比较,差异无统计学意义(P>0.05);A组E级、Ds级、Dm级、Dx级评分低于B组、C组、D组,B、C组E级、Ds级、Dm级、Dx级评分低于D组,差异有统计学意义(P<0.05);B、C组E级、Ds级、Dm级、Dx级评分比较,差异无统计学意义(P>0.05)。结论厚朴汤剂能减轻大鼠龋病形成,减轻龋损破坏程度,对大鼠人工龋病发生有一定的防治作用。

Arc-length technique for nonlinear finite element analysis

Nonlinear solution of reinforced concrete structures, particularly complete load-deflection response, requires tracing of the equilibrium path and proper treatment of the limit and bifurcation points. In this regard, ordinary solution techniques lead to instability near the limit points and also have problems in case of snap-through and snap-back. Thus they fail to predict the complete load-displacement response. The arc-length method serves the purpose well in principle, received wide acceptance in finite element analysis, and has been used extensively. However modifications to the basic idea are vital to meet the particular needs of the analysis. This paper reviews some of the recent developments of the method in the last two decades, with particular emphasis on nonlinear finite element analysis of reinforced concrete structures.

介词主题词的话语意义分析及语义序列研究

本文提出了一种介词主题词驱动的话语意义分析方法,旨在通过索引行型式提取特定语篇中的语义序列,并将其应用于自建语料库。结果显示,该方法所提取的语义序列可揭示语篇的宏观特征和历时变化。短语学研究表明,语言中存在大量词汇共选生成的多词序列或短语单位。本研究补充了短语学的研究成果,表明特定语篇中同样存在大量由意义共现生成的语义序列,而语义序列是短语单位的又一重要属性。语义序列研究可拓宽语料库短语学研究范围,丰富扩展意义单位研究。