长白山阔叶红松林种子雨组成与时空格局

种子雨是森林植物种群更新的主要方式之一，是森林生态系统自我繁衍和恢复的主要手段。为了解长白山阔叶红松林种子雨的组成及其时空变化，参照BCI 50ha 样地技术规范，在长白山阔叶红松林25ha长期监测样地内设置了150个种子收集器，从2006年5月15日到2007年11月8日，每15天收集掉落于收集器中的果实、种子及其相关附属物等。所收到的样品分别鉴定其种类并分为成熟种实、未成熟种实、花絮、果实或种子碎片及其附属物4类，记录各类别的数量，然后分别烘干称重。 研究期间，共收集到11科12属22种木本植物的种子及其它生殖器官残体，包括成熟种实16种，未成熟种实17种，花序12种，翅2种，果实或种子碎片及其附属物10种。累计收集到种实136664粒，其中成熟种实32358粒，占所有种实总数的23.80%。种实数最多的树种是紫椴(Tilia amurensis)，其次为水曲柳(Fraxinus mandshuica)，两个树种种实数占总数的89.54%。种实总重量为3320.93g，其中成熟种实总重量为1242.85g，占37.4%。成熟种实中水曲柳和紫椴的重量最大，其次是色木槭(Acer mono)，假色槭(A. pseudo-sieboldianum)、糠椴(T. mandshuric)和红松(Pinus koraiensis)。 种子雨数量年际变化明显，2006年种子雨密度为1370.25粒/m2，2007年为249.47粒/m2，差异极显著(P<0.001)。但不同年份种子雨的季节动态趋势一致，均有两个明显的大高峰期和一个小高峰期。不同物种种子雨扩散的时间格局大致可以分为“单峰”和“双峰”两种类型，在时间上体现了不同物种的更新策略。 150个收集器均收到了成熟种实，各收集器中的种实数呈偏态分布，种实数在150-250之间的收集器数量最多，共68个，种实数小于50的收集器有5个，种实数大于250的收集器共37个。样地内成熟种实数量及其空间分布差异明显，收集器中种实数在1000个以上的有3个，最多达1511个，聚集分布于样地的西北角；收集器中种实数最少的只有22个种实。种实重量的空间分布与种实数分布一样存在较明显的空间差异，只是差异性相对偏弱一些，且与种实数量的空间分布不一致。

长白山阔叶红松林昆虫多样性研究

通过季节性观察 ,系统地研究了长白山阔叶红松林昆虫类群及其多样性 .结果表明 ,长白山阔叶红松林已知的森林昆虫 2 6目 131科 116 2属 196 0种 ,其中森林害虫 11目 10 5科 881种、重要森林害虫6 38种 ;森林昆虫群落中植食性昆虫类群总数所占比重最大 ,天敌昆虫群落中以捕食性类群总数所占比重最大 .植食类群、寄生性类群和捕食类群全年的均匀度指数分别为 0 884、0 830和 0 80 6 .各类群间季节变动系数的大小顺序为捕食类群 >寄生性类群 >植食类群 .

低价林早期诊断:生态因子途径

提出了低价林早期诊断的新思路 ,即根据低价林的形成规律 ,在林分还未表现出低价林状况时就能诊断出其发展趋势 ,以便及时采取相应的经营管理措施 .以辽西油松林为例 ,从生态因子途径开展了低价林的早期诊断研究 ,建立了基于单因素实验和判别分析的生态因子途径早期诊断技术 .研究表明 ,土层厚度X1、有机质含量X2 、土壤全氮含量X3 、土壤含水率X4、土壤微生物总数量X5可选择作为油松低价林早期诊断的敏感指标 ;在综合诊断时引入了判别分析的数量分类方法 ,并根据判别分析的思路建立了油松林生长状况生态因子途径早期诊断方法 ,其步骤 :1)确定判别指标 ;2 )建立判别函数Y =1.5 96X1-0 .5 1X2 - 3.196X3 +1.6 2 2X4+1.898X5;3)通过判别函数和研究对象的各项判别指标值进行早期诊断 .低价林早期诊断的技术与方法尚有待进一步地研究、检验和完善 .

Preparation and characterization of As-cast and hot-rolled Mg-3Al-0.5Mn-0.5Zn-1MM alloy

Mg-3Al-0.5Mn-0.5Zn-1MM alloy was prepared by metal mould casting method. The as-cast ingot was homogenized and then hot-rolled at 673 K with total thickness reduction of 65%. Microstructure and mechanical properties of the as-cast and hot-rolled samples were investigated. The results showed that the as-cast sample mainly consisted of alpha-Mg, beta-Mg17Al12, Al10Ce2Mn7, and Al11RE3 (RE = La and Ce) phases. The average grain size of the sample homogenized at 673 K was about 240 gm, and it was greatly refined to about 7 mu m by dynamic recrystallization for the hot-rolled sample.

Interweaving of single-helical and equal double-helical chains with the same helical axis in a 3D metal-organic framework

A novel metal-organic framework with unprecedented interweaving of coaxial single-helical and equal double-helical chains of opposite chirality, which features a super-connective helix simultaneously tangling with eight helices, was reported.

Facile synthesis of polyaniline nanofibers using pseudo-high dilution technique

A new approach for the synthesis of polyaniline nanofibers under pseudo-high dilute conditions in aqueous system has been developed. High yield nanoscale polyaniline fibers with 18-110 nm in diameter are readily prepared by a high aniline concentration 0.4 M oxidation polymerization using ammonium persulfate (APS) as an oxidant in the presence of hydrochloric acid (HCl), perchloric acid (HClO4), (1S)-(+)-10-camphorsulfonic acid (CSA), acidic phosphate PAEG120 (PA120) and sulfuric acid (H2SO4) as the dopants. The novel pathway always produces polyaniline nanofibers of tunable diameters, high conductivity (from 10(0) to 10(1) S/cm) and crystallinity.

Facile, Efficient Copolymerization of Ethylene with Bicyclic, Non-Conjugated Dienes by Titanium Complexes Bearing Bis(beta-Enaminoketonato) Ligands

Copolymerizations of ethylene with 5-vinyl-2-norbornene or 5-ethylidene-2-norbornene under the action of various titanium complexes bearing bis(beta-enaminoketonato) chelate ligands of the type, [(RN)-N-1=C(R-2)CH=C(R-3)O](2)TiCl2 (1, R-1=Ph, R-2=CF3, R-3=Ph; 2, R-1=C6H4F-p, R-2=CF3, R-3=Ph; 3, R-1=Ph, R-2=CF3, R-3=t-Bu; 4, R-1=C6H4F-p, R-2=CF3, R-3=t-Bu; 5, R-1=Ph, R-2=CH3, R-3=CF3; 6, R-1=C6H4F-p, R-2=CH3 R-3=CF3), have been shown to occur with the regioselective insertion of the endocyclic double bond of the monomer into the copolymer chain, leaving the exocyclic vinyl double bond as a pendant unsaturation. The ligand modification strongly affects the copolymerization behaviour. High catalytic activities and efficient co-monomer incorporation can be easily obtained by optimizing the catalyst structures and polymerization conditions.

THE EFFECT ON PHYSICAL-PROPERTIES OF THE SUBSTITUTION OF CA OR BA FOR SR IN NDSRNIO4

A new solid solution series, NdSr(1-x)M(x)NiO(4) (M = Ca: 0.0 less than or equal to x less than or equal to 1.0; M = Ba: 0.0 less than or equal to x less than or equal to 0.6), was synthesized by solid state reaction, and the structures, magnetic and electrical properties and optical spectra of this series have been studied. All the samples crystalized in tetragonal systems, with the exception of NdCaNiO4, which crystallized in the orthohombic system. IR spectra of NdSr1-xCaxNiO4 indicated that the lengths of two Ni-O bonds decrease with increasing Ca content. The electrical conduction changed from metallic-type to semiconductive-type when x greater than or equal to 0.4 (M = Ca, Ba), and the room temperature resistivities of NdSr1-xCaxNiO4 increased with the increase of Ca content. Magnetic susceptibility measurements revealed that Ni+3 ions in all the samplies were in low-spin state over the temperature range 77-300 K.

“探索者”号自治式无缆水下机器人控制软件体系结构

本文详细介绍了我们为“探索者”号自治式无缆水下机器人（以下简称ＡＵＶ）设计的控制软件体系结构。该体系结构可分为使命控制，运动监控与设备操作，实时调度和实时处理四个不同的控制层次及一个全局数据区五部分。

岩溶地区缺失原岩残余结构红色风化壳的粒度分布特征及成因指示—以贵州平坝为例

选择和使用合适的示踪指标，是揭示岩溶地区红色风化壳物质来源的关键。粒度参数在古环境研究中被大家广泛采用，但是在风化壳物源示踪方面还是新的尝试，尤其在我国。本文选择贵州中部平坝县3个下伏基岩为白云岩的缺失原岩结构的红色风化壳剖面，通过基岩酸不溶物和剖面的粒度分析，表明红色风化壳物质对下伏基岩有很好的继承性。粒度参数随剖面深度呈规律变化，指示了标准残积风化壳的发育特征。