Accelerated hybrid viscosity and steepest-descent method for proximal split feasibility problems

The purpose of this paper is to present an accelerated hybrid viscosity and steepest-descent method for solving proximal split feasibility problems (if solutions exist) in real Hilbert spaces. We obtain strong convergence of the sequence generated by our scheme under some suitable conditions on the parameters. In all our results in this work, our iterative schemes are proposed with a way of selecting the step sizes such that their implementation does not need any prior information about the bounded linear operator norm. Finally, we give numerical comparisons of our results with other established result to verify the efficiency and implementation of our new method.     

Adaptive subgradient method for the split quasi-convex feasibility problems

In this paper, we consider a type of the celebrated convex feasibility problem, named as split quasi-convex feasibility problem (SQFP). The SQFP is to find a point in a sublevel set of a quasi-convex function in one space and its image under a bounded linear operator is contained in a sublevel set of another quasi-convex function in the image space. We propose a new adaptive subgradient algorithm for solving SQFP problem. We also discuss the convergence analyses for two cases: the first case where the functions are upper semicontinuous in the setting of finite dimensional, and the second case where the functions are weakly continuous in the infinite-dimensional settings. Finally some numerical examples in order to support the convergence results are given.     

Novel optical packet with non-return-to-zero label and duobinary carrier-suppressed return-to-zero payload

A novel packet format with non-return-to-zero (NRZ) label and duobinary carrier-suppressed return-to-zero (DCS-RZ) payload is proposed for optical packet switching networks.NRZ label is followed by DCS-RZ payload with a certain guard time.The spectra of the low-rate NRZ label locate around the optical carrier frequency where some parts of the corresponding spectra of the high-rate DCS-RZ payload have been suppressed due to DCS-RZ modulation.At the switching node,the label or payload extraction can be realized simply through an optical bandpass or notch filter respectively.The feasibility of the scheme is verified by the simulation on the famous photonic design platform designed by Virtual Photonics Inc.(VPI).The effects of optical filter bandwidth on the received signal quality are discussed by analyzing bit error rate(BER)and contrast ratio performances.     

磁化套筒惯性聚变初步探索研究与实验可行性分析

磁化套筒惯性聚变(MagLIF)构型可充分利用现有大型脉冲功率驱动装置,如聚龙一号等。基于磁流体力学方程组和1∶1比例氘氚(DT)混合燃料聚变模型,开发了零维MagLIF数值模拟程序并进行了初步探索研究。计算结果表明初始负载参数(如轴向磁场强度,预加热温度、时刻,负载半径等)与聚变产额之间有着密切的联系,在给定条件下,可依据计算给出的定性关系进行负载优化设计。值得注意的是,根据计算结果,即使在理想条件下,氘氚燃料要实现能量收支平衡,则驱动器的电流必须大于21.2 MA。这意味着聚龙一号装置(10 MA)无法开展集成化的MagLIF实验,进一步的校验计算验证了上述观点,并在此基础上提出铝套筒分解实验的建议和负载设计参数。所取得的计算结果有利于加深对MagLIF套筒压缩阶段物理过程的认知和理解。     

X射线荧光光谱扫描法在实物地质资料中应用的可行性探讨

实物地质资料的定量无损检测对于地质学研究具有十分重要的意义,在国外x射线荧光光谱（XRF）扫描分析方法在岩芯分析测试方面的应用研究,已取得了十分显著的成果。XRF岩芯扫描分析方法具有分析速度快、无损检测、连续定量测试多元素和样品制备简单等特点,在获取高分辨测试方面更具独特的优势。因此,这一分析方法在实物地质资料分析方面具有极好的应用前景,它能提高分析的准确性和精确度,降低分析测试成本,保护实物地质资料的完整性,加强实物资料的整体性研究,为实物地质数据采集与信息共享提供更加准确的数据。从介绍XRF岩芯扫描分析方法的原理、特点、影响因素、分析结果的校正人手,进而探讨该测试方法在实物地质资料中应用的可行性。     

RADIATION DEGRADATION OF CHITOSAN IN THE PRESENCE OF H2O2

INTRODUCTIONChitosan, poly-β-(1 -?4)-D-glucosamine, can be obtained from chitin by deacetylation with alkali. It is soluble indilute acidic medium due to the presence of amino groups. The use of chitosan in many areas, such as foodprocessing, biochemistry, Pharmaceuticals, medicine, and agriculture has been developed over the pastdecades[1,2].In recent years, it has been reported that many properties of chitosan depend on the molecular weight[3]. Thechitosan oligomers possess better fun…     

强收敛的球松弛CQ算法及其应用

为了求解分裂可行问题,Yu等提出了一个球松弛CQ算法.由于该算法只需计算到闭球上的投影,同时不需要计算有界线性算子的范数,该算法是容易实现的.但是球松弛CQ算法在无穷维Hilbert空间中仅仅具有弱收敛性.首先构造了一个强收敛的球松弛CQ算法.在较弱的条件下,证明了算法的强收敛性.其次将该算法应用到一类闭凸集上的投影问...     

DCLR与TLA共混改性沥青的性能对比

以SK-90沥青为基质沥青,分别加入相同掺量(与沥青质量比为5%、10%、15%和20%)的DCLR和TLA,利用SHRP PG、针入度分级体系、红外光谱仪和凝胶色谱仪对比分析DCLR和TLA共混改性沥青的宏观性能和微观结构的变化。结果表明,DCLR和TLA的加入均可以改善沥青的高温性能,但对沥青的低温性能和疲劳性能产生一定的不利影响。同时,根据DCLR和TLA共混改性沥青的官能团和分子量分布的变化可以判断DCLR和TLA对沥青的改性作用主要为物理改性,在某种程度上,DCLR不能完全替代TLA。