The Properties of Light Pressure Force with High Order in Laser Fields

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A characterization ofL n (q) by the normalizers' orders of their sylow subgroups

LetG be a finite group. If for every primer, whereR ₁ Syl _r G andR ₂ Syl _r (L _n (q)), thenG L _n (q).     

The cytogenetics and fiber properties of an allohexaploid betweenGossypium hirsutum andG. somalense

Cytogenetics and fiber properties were studied on the Gossypium hirsutum×G. somalense F₂ hybrid and later generations. The cytological analyses of pollen mother cells (PMCs) were made at meiotic metaphase Ⅰ. The results indicated that the hybrid was a new allohexaploid, its chromosome number determined as 2n=6x=78, and genome group as 2[(AD)₁E₂]. Chromosomal configurations of the hexaploid averaged 0.15Ⅰ+ 38.72Ⅱ+ 0.11Ⅲ + 0.02Ⅳ per cell, 85.09% PMCs having 39 bivalents, and only 11.84% PMCs having 1 to 2 multivalents, indicating that heterogenetic recombinations of chromosomes occurs between (AD)₁ and E₂, nevertheless, the frequency is lower. The hexaploids are self-fertile and the progenies remain the hexaploids, whose fibers are light brown and have higher strength by measurement of HVI 900 system. The fiber strength increases 42% than that of upland cotton variety. Therefore, it is possible for the hexaploid to be an important germplasm resource to improve fiber strength of cotton.     

激光测距卫星的点扩展函数研究

本文将非相干成象系统的点扩展函数概念引入到激光测距系统,详细推导出激光测距卫星的点扩展函数的基本形式,并分别计算了Lageos和ERS卫星的点扩展函数以及脉冲和点扩展函数作用后的强度分布,取得了非常好的结果.     

Combinatorial constructions for optimal 2-D optical orthogonal codes with AM-OPPTS property

We develop a new one-to-one correspondence between a two-dimensional (m × n, k, ρ) optical orthogonal code (2-D (m × n, k, ρ)-OOC) with AM-OPPTS (at most one-pulse per time slot) property and a certain combinatorial subject, called an n-cyclic holey packing of type m ⁿ . By this link, an upper bound on the size of a 2-D (m × n, k, ρ)-OOC with AM-OPPTS property is derived. Afterwards, we employ combinatorial methods to construct infinitely many 2-D (m × n, k, 1)-OOCs with AM-OPPTS property, whose existence was previously unknown. All these constructions meet the upper bounds with equality and are thus optimal.     

墩高对不对称高墩连续刚构桥力学特性的影响（英文）

对不同墩高下的不对称高墩连续刚构桥成桥阶段进行了力学特性研究,获得了高墩连续刚构桥在不同墩高下的主梁和桥墩的内力、位移变形特性.研究结果表明,桥墩墩高的变化对主梁内力、主梁竖向位移、墩内力、墩横向位移均产生不同程度的影响,其中对跨中主梁竖向位移和墩顶剪力的影响较大,主梁竖向位移随着墩高的增大而增大,最大位移处平均增幅14.3%,墩顶主梁剪力随着墩高的增大而减小,平均变化率37.1%.     

小波包变换及其在数字水印算法中的应用

在对小波包变换进行分析的基础上,将其应用在图像数字水印算法中.首先对图像进行小波包分解,并根据视觉感知特性将作为水印的二值图像嵌入到分解后的高频分量中,然后进行小波包重构得到嵌入水印的图像.实验表明,应用基于小波包变换的水印算法处理的图像能够经受常规的图像算法攻击,具有较强的鲁棒性和实用性.     

腔QED中三粒子W态的隐形传递

首先,针对传递三粒子w态的困难,提出了腔QED中的两种方案来完成w态的隐形传态．在一种方案中,我们利用一个EPR对和GHZ态来作为量子通道,在真空腔中实现了对w态的传送．而第二种方案与第一种不同之处是,我们使用了两个EPR对来作为量子通道,并且弓l入了一个附加粒子来完成传态的．此外,这些方案的显著优点是不用Bell基测量,而且可忽略腔场热作用和腔延迟作用的影响．     

浆纱机监测系统中多道信号采集及动态显示的实现

在浆纱机监测系统中,多道信号采集及数据动态显示是一重要环节。本文以8031CPU为核心,设计并实现了一系统接口,可进行多道模拟信号采样,多路外部脉冲计数,并利用微机系统并行口进行系统接口与微机之间的数据通讯。系统接口中采用的光电隔离技术,使设备地与微机系统地分开,保证了微机系统的完备性。对经过了光电隔离器的模拟信号进行非线性校正,提高了光电隔离器输入输出的传输精度。微机系统上设计的信息动态显示窗口,可及时反映出浆纱过程的主要生产指标及其变化趋势。     

Existence of Perfect 4-Deletion-Correcting Codes with Length Six

By a T ^*(2, k, v)-code we mean a perfect4-deletion-correcting code of length 6 over an alphabet of size v, which is capable of correcting anycombination of up to 4 deletions and/or insertions of letters that occur in transmission of codewords. Thethird author (DCC Vol. 23, No. 1) presented a combinatorial construction for such codes and prove thata T ^*(2, 6, v)-code exists for all positive integers v 3 (mod 5), with 12 possible exceptions of v. In this paper, the notion of a directedgroup divisible quasidesign is introduced and used to show that a T ^*(2, 6,v)-code exists for all positive integers v 3 (mod 5), except possiblyfor v {173, 178, 203, 208}. The 12 missing cases for T ^*(2,6, v)-codes with v 3 (mod 5) are also provided, thereby the existenceproblem for T ^*(2, 6, v)-codes is almost complete.