Skin collagen fiber-based radar absorbing materials

By using skin collagen fiber (CF) as raw material,Schiff base structure containing CF (Sa-CF) was synthesized through CF-salicylaldehyde reaction.Then a novel radar absorbing material (Fe-Sa-CF) was prepared by chelating reaction between Sa-CF and Fe 3+.The coaxial transmission and reflection method was used to analyze the complex permittivity and complex magnetic permeability of these CF-based materials,and the radar cross section (RCS) method was used to investigate their radar absorbing properties in the frequency range of 1.0-18.0 GHz.Experimental results indicated that the conductivity of CF increased from initial 1.08×10-11 to 2.86×10-6 S/cm after being transferred into Fe-Sa-CF,and its dielectric loss tangent (tanδ) in the frequency range of 1.0-17.0 GHz also increased.These facts suggest that the Fe-Sa-CF is electric-loss type radar absorbing material.In the frequency range of 3.0-18.0 GHz,Sa-CF (1.0 mm in thickness) exhibited somewhat radar absorbing property with maximum radar reflection loss (RL) of-4.73 dB.As for Fe-Sa-CF,the absorbing bandwidth was broadened,and the absorbing intensity significantly increased in the frequency range of 1.0-18.0 GHz where a maximum radar RL of-9.23 dB was observed.In addition,the radar absorbing intensity of Fe-Sa-CF can be further improved by increasing membrane thickness.When the thickness reached to 2.0 mm,the RL values of Fe-Sa-CF were-15.0-18.0 dB in the frequency range of 7.0-18.0 GHz.Consequently,a kind of novel radar absorbing material can be prepared by chemical modification of collagen fiber,which is characterized by thin thickness,low density,broad absorption bandwidth and high absorption intensity.     

浅谈数字媒体信息压缩技术

随着社会的进步,计算机技术的出现,科技的创新,人们生产生活方式日益数字化,数字媒体出现并得到迅速发展。文章介绍了数字媒体的概念及数字媒体的特点,针对发展迅速的数字媒体,就数字媒体信息压缩的必要性和可行性进行论证分析,按出发点进行分类介绍了几种数字媒体信息压缩方法．应用Huffman编码和行程编码两种不同的编码方式针对两个不同的实例分别加以论证说明．就数字媒体信息压缩技术的未来发展进行展望。     

漆酶对直接耐晒蓝B2RL脱色性能的研究

利用灵芝粗漆酶对直接耐晒蓝B2RL染液脱色,采用单因素逐一优化法确定其最适反应条件。结果表明：在pH值7．0、温度50℃、漆酶用量2u／mL、染料质量浓度150mg／L条件下,漆酶对直接耐晒蓝B2RL脱色反应4h后脱色率达到71．72％,反应24h后脱色率达到86．4％,脱色效果明显．研究为漆酶处理偶氮类染料废水提供了理论依据．     

Strategic Bidding Model for Power Generation Company Based on Repast Platform

： The bidding strategies of power generations in the market are a dynamic and complex problem. It is difficult to analyze and compute with the traditional mathematical methods, which is conspicuous in the middle or long-term transactions. This paper pro- poses a modelity which is the middle or long-term bidding strategy in two-tiers electricity market that is based on the optimal power flow （OPF）. Uncertainties in the outside world are regarded as the agent （Agent） of ＂external environment.＂ Under this conditions, Agent through environment evaluation judges to select viable strategic. Through learning from experiences and opponent＇s behaviors, Agent guides the purpose of the best production. The adaptability and superiority of this model is tested based on Repast with a standard IEEE-5 bus 6 notes test system.     

非正弦周期电压作用下的RL串联电路

分析和研究了非正弦周期电压作用下的舭串联电路（线性、非时变的魁串联电路）,得NT暂态响应分量和稳态响应分量．     

Recommended Concentration Limits of Typical Indoor Air Contaminants

From the view of both objective and subjective factors.the indoor air quality(IAQ)evaluation was considered.Carbon dioxide (CO2) and formaldehyde (HCHO) were selected as the typical contaminants of indoor air,and the evaluation method of logarithmic index was adopted as the evaluation means of IAQ.Then the recommended limits (RL) of typical contaminants CO2 and HCHO were given through analysis and calcula-tion.The limits of CO2 and HCHO in Indoor Air Quahty Standard of China or other existing standards probably correspond to the level of PD=25(%).The result shows that the existing standards fail to meet the require-ment of the definition of"acceptable indoor air quality",that is to say,less than 20% of the people express dis-satisfaction.When PD=20%,RL of CO2 and HCHO are 728×10-6 and 0.068×10-6 respectively,which are stricter than the limits in the existing standards.The method proposed in this paper is applicable to 13.1%≤PD≤86.7%.     

基于GA-RL的进化博弈求解主从博弈结构的供应链协调问题

供应链协调问题多数基于主从博弈结构建模,但如果研究对象是相对复杂的供应链结构.理论求解主从博弈问题就变得困难.因此从求解一对一的供应链协调问题开始,针对主从博弈问题的特点,利用个体学习的进化博弈仿真手段,设计了经销商利用经验分布的预期随机需求的信念更新模式与最优反应的决策模式,为生产商分别设计了基于强化学习的信念更新模式与基于遗传算法搜索策略空间的决策模式,并将两者有机结合,取得了博弈问题的均衡解并且验证该解与理论求解结果一致,为进一步求解复杂问题提供了新的途径.     

碱性品红与牛血清白蛋白的相互作用及其应用

以三苯甲烷类阳离子染料碱性品红(RL)为荧光探针建立蛋白质的定量分析方法．在近中性范围内,碱性品红与蛋白质有较强的结合,该产物的荧光强度与蛋白质的量呈线性关系．线性响应范围为0～5．0μg／mL,最低检出限可达19．6μg／L,用于实际样品中蛋白质含量的测定,结果满意．研究了RL与牛血清白蛋白(BSA)的结合模型,发现结合反应符合Pesavento提出的相分配模型,求得不同温度下RL与BSA相互作用的结合常数,依据热力学常数确定了RL与BSA之间的作用力类型为疏水作用力．     

强化学习中的策略重用:研究进展

策略重用(policy reuse,PR)作为一种迁移学习(transfer learning,TL)方法,通过利用任务之间的内在联系,将过去学习到的经验、知识用于加速学习当前的目标任务,不仅能够在很大程度上解决传统强化学习(reinforcement learning,RL)收敛速度慢、资源消耗大等问题,而且避免了在...     

考虑测量误差和随机效应的设备剩余寿命预测#br#

针对非线性退化设备的剩余寿命预测问题,尚未系统研究考虑测量误差和随机效应的退化建模、先验参数估计及相应的剩余寿命预测方法。首先建立考虑测量误差和随机效应的非线性Wiener退化模型;利用同类设备历史监测数据,基于期望最大化算法估计出退化模型中固定系数和随机系数先验分布;采用状态空间模型描述目标设备当前监测状态,基于Kalman滤波算法迭代估计出随机系数后验分布和当前真实退化状态;利用全概率公式,推导出考虑隐含状态估计不确定性的设备剩余寿命的概率密度函数;仿真实例分析表明,所提方法较现有方法在参数估计误差和剩余寿命预测精度上具有一定优势。