An Improved S-Random Interleaver Design for Turbo Code Based on Chaos Model

A new method to design interleaver based on Henon chaos model is presented. The designed interleaver is with rather random behavior. Experimental results show that the proposed S-henon interleaver make a magnitude of im provement in bit error rate （BER） performance by 0.4 dB compared with the S-random interleaver for AWGN channel respectively. The S-henon interleaver may be adapted to 3G mobile communication systems.     

关于简化Newton方法收敛性的注记

在假设算子方程解存在的前提下,给出了以解为中心的一个球域,证明了当初始点落到这个球域时,用于判断简化Newton方法收敛性的Kantorovich定理的条件必然满足,从而由简化Newton方法产生的迭代序列收敛.     

健康与患黑胫病烟株根内AMF多样性和群落结构差异分析

丛枝菌根真菌（arbuscular mycorrhizal fungi,AMF）在烟草生长生理、抗病抗逆等方面具有积极作用.为探明烟株患黑胫病后对根内AMF多样性和群落结构的影响,分别以烟草K326和云烟87健康、感染黑胫病烟株的根部及根际土壤作为研究对象,应用Illumina Miseq高通量测序技术探明烟草根部AMF多样性,采用显微形态观察烟草根内AMF侵染水平和根际土壤孢子密度,并分析土壤理化性质和AMF侵染特征的相关性.高通量测序结果表明在烟草根部共检测出1 655个AMF-OTUs,隶属于1纲4目5科6属,其中,Glomus为云烟87健康烟株根内AMF的优势属,其余样品优势属均为Paraglomus.聚类分析表明两个品种健康烟株根内AMF群落相似性较高,患病植株间根内AMF群落比较类似.侵染结果显示,患病烟株AMF侵染状况与土壤孢子密度均低于健康烟株根际土壤. RDA分析结果表明,全钾是影响AMF孢子密度和侵染状况的主要驱动因子,其次为速效磷和全磷;土壤p H值为烟株根内AMF多样性的主要影响因素,且两者呈负相关;此外,土壤中钾含量对烟草根内AMF群落组成的影响最为明显.研究...     

砂卵石地层盾构隧道掌子面稳定性理论分析

盾构隧道穿越砂卵石地层掘进施工时,由于砂卵石的地层特性及施工扰动,隧道掌子面容易失稳而引发事故。为研究砂卵石地层盾构隧道掌子面稳定所需的最小支护力,结合砂卵石地层的掌子面失稳模式,在三维Murayama模型的基础上,将掌子面前方土体的滑动面形式假设为对数螺旋滑移线,结合上部松动区域的破坏机制,引入椭球体放矿理论,对传统的棱柱体筒仓模型进行改进,进一步通过极限平衡法推导出砂卵石地层的掌子面极限支护力求解公式;最后通过离散元数值模拟验证所推公式,两者的误差为3.1%。结果表明所得公式可对砂卵石地层的掌子面极限支护力进行较为精确的求解。研究成果以期为砂卵石地层掌子面极限支护力计算理论提供依据。     

稀土果糖—高氯酸及稀土—果糖—硼酸配合物的研究

首次合成了镧（Ｌａ）、镨（Ｐｒ）、钕（Ｎｄ）、钐（Ｓｍ）、钆（Ｇｄ）的果糖－高氯酸固体配合物以及Ｌａ,Ｐｒ,Ｎｄ,Ｓｍ,Ｇｄ和Ｅｕ（铕）的硼酸－果糖配合物．利用化学分析,ＩＲ,１ＨＮＭＲ,ＵＶ和热谱等物理化学手段对这两系列共１１个配合物的组成和成键情况进行了表征,并对它们的某些物理化学性质进行了研究．结果表明：稀土－果糖－高氯酸配合物的组成为：ＲＥ３（Ｃ６Ｈ１１Ｏ６）５（ＯＨ）２（ＣｌＯ４）２３Ｈ２Ｏ（ＲＥ＝Ｌａ,Ｐｒ,Ｎｄ,Ｓｍ,Ｇｄ）;稀土－果糖－硼酸配合物的组成为：ＲＥ（Ｃ６Ｈ１２Ｏ８Ｂ）２Ｃｌ２ＣＨ３ＯＨ,（ＲＥ＝Ｌａ,Ｐｒ,Ｎｄ,Ｓｍ,Ｅｕ,Ｇｄ）．     

微重力条件下流动与传热传质的地面模拟

为了给载人航天器热设计提供依据,考核热控系统的适应能力以及确定热湿控制参数。发展了材料－温度－湿度保持技术,以实现微重力条件下导热－对流－辐射换热与传质稳态系统的地面相似模拟。通过调整壁面热流密度分布,可以使尺寸适当缩小后的模型的材料、温度和湿度同时保持不变,同时还能抑制由重力引起的自然对流的作用,从而实现地面模型与微重力场中原型流动、换热和传质相似。并用数值方法对均匀进风条件下的流动、换热和传质的相似性进行了验证。     

Distribution of δD in 25-cm Surface Snow Along Trans-Antarctic Route (Ⅱ)——The “1990 International Trans-Antarctic Expedition” Glaciological Research

On the way of the "1990 International Trans-Antarctic Expedition", the first author of this paper, the Chinese member of the expedition, collected 104 snow samples in 25-cm surface snow along a 5986-km route on Antarctic ice sheet from west to east. The geographical distribution of δD across the Antarctica by the longest route is obtained from stable isotope analysis for the first time. After discussing regional differences of physical geographic conditions, maritime-continental influence, altitudes and latitudes at sampling sites, the distribution of δD is considered to have a close relation to latitudes, but the topographic effect is prominent in some particular regions. The mean annual temperature at sampling site and its relationship with δD in surface snow covering Antarctica from west to east are discussed also. The δD-temperature gradient from the south end of Antarctic Peninsula to Vostok obtained in this paper is very close to that in Terre Adelie Land obtained by predecessors. The snow-dri     

Structure and stability of endohedral X@Si20H20 complexes (X = Li, Na, K, Be, Mg, Ca)

The structure and stability of endohedral X@Si₂₀H₂₀ complexes (X = Li^0/+, Na^0/+, K^0/+, Be^0/2+, Mg^0/2+, Ca^0/2+) have been studied at the B3LYP/6-31G* level of density functional theory. It is found that complexes with X = Na^0/+, K^0/+, Mg and Ca^0/2+ are energy minimum structures with X at the cage center in I_h symmetry, while those with X = Li^0/+, Be^0/2+, Mg²⁺ have off-centered structures with X towards one pentagon face in C_5v symmetry. Large electron or charge transfer between the Si₂₀H₂₀ cage and the encapsulated X has been observed.     

A Novel Method for Quantification of Circulating DNA in Serum by Capillary Zone Electrophoresis

In this paper, we first presented a novel method for quantification of circulating DNA in human serum based on capillary zone electrophoresis with laser-induced fluorescence detection (CZE-LIF). The serum was digested by proteinase to release free DNA, and then CZE-LIF system was used for the quantification of total circulating DNA. This method was successfully used to quantify the circulating DNA levels in sera from healthy individuals and certain cancer patients.We found the significantly elevated circulating DNA levels in certain prostate cancer patients. Our results demonstrated that CZE-LIF system has good linearity, excellent sensitivity (0.5 ng/mL DNA),satisfactory reproducibility (RSDs in one day and between days were both less than 5%) and reliability, and is well suitable to the quantification of the circulating DNA in human serum or plasma.     

物理图象的可视化研究

通过对静止点电荷系的电力线及波振动的研究，应用MATLAB对其电力线在空同分布的可视化和波的振动叠加及阻尼振动振幅的衰减图象的可视化，能很好地对物理学中那些抽象的知识形象化、具体化，进而通过图形直观地描绘出来．