吉林省白城地区干草原栗斑腹的繁殖生态

栗斑腹在吉林省为留鸟 ,一年可繁殖两次 ,其雏鸟为典型的晚成鸟。 4月末开始有求偶追逐和争雌行为 ,5月中旬产卵。雌雄鸟筑巢时间分别是 43 min/d和 3 6min/d(筑巢第 4天 )。平均窝卵数为 5 .0 9± 0 .5 8枚 /巢 (n=3 1 ) ,孵卵前、中、后期雌鸟孵卵占白天活动时间的 3 5 %、74.5 %和 67.6% ,孵化期为 1 2 d,孵化率为 3 6.3 % ,2、8日龄喂雏分别为 4.5次 /h和 9.0次 /h。雏鸟的体重及外部器官的发育除嘴峰外 ,生长曲线均符合 Logistic方程 ,而嘴峰长的生长近似直线 ,栗斑腹雏鸟生长发育体重的生长模型为 :W =1 4.95 /1 +(e- 0 .552 ( t- 3.6 3) ) ,雏鸟 1 1日龄后出飞 ,繁殖成活率为 2 7.7%。

水稻化感品种根分泌物中非酚酸类化感物质的鉴定与抑草活性

水稻化感品种能从根系分泌释放化感作用物质 ,长期以来 ,酚酸类物质被认为是水稻根分泌的主要化感物质 ,但这一结论常常被质疑。利用连续循环和直接树脂吸收两种方法采集典型的水稻化感品种 PI31 2 777幼苗的根分泌物 ,并用液相色谱 /质谱(L C/ MS)联用技术鉴定了根分泌物中的非酚酸类物质。结果显示 ,水稻 PI31 2 777幼苗根系能分泌释放 7-甲氧基羟基肟酸、羟基肟酸、3-异丙基 - 5 -乙酰氧基环己烯酮 - 1、5 ,7,4′-三羟基 - 3′,5′-二甲氧基黄酮、二萜内酯 A和二萜内酯 B6个非酚酸类化合物。经液相色谱 (HPL C)定量分析 ,这些化合物在水稻生长 1 0 d的根分泌物中的浓度为 5～ 1 9μmol/ L。进一步的生测结果显示 ,这些化合物在其释放的浓度范围能对稻田常见的稗草和异型莎草有抑制活性 ,尤其是这些化合物的等摩尔混合物的抑草活性增加 ,同时水稻根分泌物的抑草活性与土壤载体显著相关。表明羟基肟酸、环己烯酮、黄酮和二萜内酯四类非酚酸类物质是水稻的主要化感物质 ,这与近期愈来愈多的研究结果一致

土壤温度和水分对长白山3种温带森林土壤呼吸的影响(英文)

为了研究土壤温度和土壤含水量对阔叶红松林(山地暗棕壤)、云冷杉暗针叶林(山地棕针叶林土壤)和岳桦林(生草森林土)的土壤呼吸的影响,于2001年9月在长白山进行了土壤实验。利用增加土壤样柱的含水量,将土壤含水量分为9%,、21%、30%、37%和43%5个等级,土壤样品分别在0、5、15、25和35 的温度下保持24小时。阔叶红松林土壤在0~35 范围内,土壤呼吸速率与温度呈正相关。在一定的含水量范围内(21%~37%),土壤呼吸随含水量的增加而升高,当含水量超出该范围,土壤呼吸速率则随含水量的变化而降低。土壤温度和水分对土壤呼吸作用存在明显的交互作用。不同森林类型土壤呼吸作用强弱存在显著差异,大小顺序为阔叶红松林>岳桦林>云冷杉暗针叶林.红松阔叶林土壤呼吸作用的最佳条件是土壤温度35 ,含水量37%;云冷杉暗针叶林下的山地棕色针叶土壤呼吸作用的最佳条件是25 ,21%;岳桦林土壤呼吸作用的最佳条件是35 ,含水量37%。但是,由于长白山阔叶红松林,云冷杉林和岳桦林处在不同的海拔带上,同期不同森林类型土壤温度各不相同,相差4~5 ,所以野外所测的同期的山地棕色针叶林土呼吸速率应低于暗棕色森林土呼吸速率,山地生草森林土呼吸速率应高于山地棕色针叶林土的呼吸速率。图2表1参25。

基于ECA规则的企业过程数据集成系统设计与实现

流程企业中的信息主要包括管理数据和过程数据，随着企业信息化进程的推进，实现管理数据和过程数据的集成对提高流程企业生产管理与决策的质量、效益和水平起到越来越重要的作用，为实现流程企业的管控一体化创造了条件。本文在对流程企业的数据集成需求和现有的过程数据集成方法全面分析的基础上，针对现有的过程数据集成方法无法保证数据集成过程的主动性以及数据的时效性问题，提出了基于ECA规则的过程数据集成方法，该方法将具有主动机制的ECA规则引入到数据集成中，通过事件触发规则来完成数据集成任务，保证了数据的时效性和可靠性，具有一定的应用价值。论文主要工作如下： 1．分析了流程企业生产数据的特点和过程数据集成的重要性，总结了现有的解决过程数据集成问题方法的不足，针对已有方法无法保证过程数据集成的主动性和数据的时效性问题，提出了基于ECA规则的过程数据集成方法。 2.分析了流程企业数据集成的具体需求特点，给出了过程数据集成系统中的ECA规则的设计描述。基于实时数据库提供的发布/订阅机制，阐述了系统对规则中主要事件类型产生的捕获处理过程。 3.设计了基于ECA规则的过程数据集成框架，研究了框架中主要模块设计所用到的关键技术，包括复合事件检测机制、规则语法解析和规则调度策略，分析了该框架的特点，说明了系统运行流程。 4．基于上述研究，开发了基于ECA规则的企业过程数据集成系统。该系统已经投入石化和钢铁企业的实际应用中,取得了较好的效果。

基于词汇链与文本切分的更新型多文档摘要技术研究

本文从文本摘要的背景和概念入手，着重介绍了新近出现的两种自动文本摘要类型：查询型摘要和更新型摘要。接着从基于外部特征、基于简单语义分析和基于深度语义分析三个方面详细给出了自动文本摘要技术的主要方法，以及目前国际上普遍采用的三种自动摘要评价方法：ROUGE，Pyramid，BE。本文以基于词汇链的摘要方法为研究重点，在描述词汇链构建算法、词汇链摘要算法及其优化算法的基础上，主要从以下四个方面展开了研究工作： 1) 将用户查询关键词词义序列引入词汇链评分算法，利用词汇链与查询关键词词义序列的语义相似度为词汇链评分，并结合经典的Strongest Chain评分方法以获得能同时满足正确体现原文含义并且符合用户查询的词汇链。 2) 利用词汇链是原始文档含义的中间表示这一特性，通过对来自历史文档和待摘要文档这两方面的词汇链进行相似度计算，实现了历史信息与新信息的分离，并依此生成了更新型摘要。 3) 对旧词汇链结构进行扩展，使之同时包含链成员来源句段，并且通过引入文本切分研究领域的TextTiling算法，对同一条链的链成员来源句段所组成的临时短文进行切分，以切分结果作为摘要候选，实现了句子抽取的摘要生成方法和段落抽取的摘要生成方法的结合，提高了生成摘要的良构性。 4) 依据上述算法改良了原有的自动文本摘要系统，并与跨语言检索系统相结合实现了一个中英跨语言新闻摘要系统。

东北地区热量资源栅格化信息系统的建立和应用

利用东北地区172个气象台站30a(1961年～1990年)的整编温度资料和东北地区500m×500mDEM数据,建立了东北地区温度要素的空间分布模型。结果表明,温度要素的宏观本底值的模拟以三维二次幂级数展开法效果较好,其误差气温多在02℃～04℃,≥10℃初日、终日为11d～20d,≥10℃初终间隔日数为22d～29d,≥10℃积温为56℃·d～89℃·d。3省各温度要素的小地形影响程度不同,文中对小地形影响显著的要素进行了模型修正。利用建立的温度要素空间分布模型,构建了东北地区各温度要素的网格数字专题

Morphology of head-to-tail poly(3-hexylthiophene) single crystals from solution crystallization

Single crystals of head-to-tail poly(3-hexylthiophene)s have been grown through the method of isothermal solution crystallization. Electron diffraction in combination with powder X-ray diffraction revealed the crystal structure, a = 1.52 nm, b = 3.36 nm, c = 1.56 nm and alpha = beta = gamma = 90 degrees.

Crystal structures of EtEDTB center dot 1.4C(2)H(5)OH center dot 5H(2)O and H4EtEDTB(ClO4)(4)center dot C2H5OH (EtEDTB=N, N, N ', N '-tetrakis[2-(1-ethylbenzimidazolyl)methyl]-1,2-ethanediamine)

The crystal structures of EtEDTB.1.4C(2)H(5)OH.5H(2)O 1 and H4EtEDTB(ClO4)(4).C2H5OH 2 (EtEDTB = N, N,N',N'-tetrakis[2-(1-ethylbenzimidazolyl)methyl]-1,2-ethanediamine) have been determined by single-crystal X-ray diffraction method. Compound 1 crystallizes in the space group P(1) over bar with a = 11.489(2), b = 11.866(3), c = 12.002(3) Angstrom, alpha = 97.47(2), beta = 114.564(13), gamma = 114.11(2)degrees, V = 1266.6(5) Angstrom(3), Z = 1, M-r = 847.48, D-c = 1.111 g/cm(3), F(000) = 456 and mu(MoKalpha) = 0.076 mm(-1). A total of 5207 reflections were measured for 1, of which 4323 were independent. The structure of 1 was solved by direct methods and refined by full-matrix least-squares technique to the final R = 0.0706 and wR = 0.1802 for 1318 observed reflections with I > 2sigma(I). In the structure of 1, centrosymmetric EtEDTB molecules are linked by hydrogen bonds through water and ethanol to form 2-dimensional network. Compound 2 crystallizes in the space group C2/c with a = 24.260(5), b = 13.040(3), c = 17.680(4) Angstrom, beta = 97.50(3)degrees, V = 5545.2(2) Angstrom(3), Z = 4, M-r = 1140.80, D-c = 1.366 g/cm(3), F(000) = 2384 and mu(MoKalpha) = 0.289 mm(-1).

Effect of La/Ce ratio on the structure and electrochemical characteristics of La0.7-xCexMg0.3Ni2.8Co0.5 (x=0. 1-0.5) hydrogen storage alloys

The effect of La/Ce ratio on the structure and electrochemical characteristics of the La0.7-xCexMg0.3Ni2.8Co0.5 (x = 0.1, 0.2, 0.3, 0.4, 0.5) alloys has been studied systematically. The result of the Rietveld analyses shows that, except for small amount of impurity phases including LaNi and LaNi2, all these alloys mainly consist of two phases: the La(La, Mg)(2)Ni-9 phase with the rhombohedral PuNi3-type structure and the LaNi5 phase with the hexagonal CaCU5-type structure. The abundance of the La(La, Mg)(2)Ni-9 phase decreases with increasing cerium content whereas the LaNi5 phase increases with increasing Ce content, moreover, both the a and cell volumes of the two phases decrease with the increase of Ce content. The maximum discharge capacity decreases from 367.5 mAh g(-1) (x = 0.1) to 68.3 mAh g(-1) (x = 0.5) but the cycling life gradually improve. As the discharge current density is 1200 mA g(-1), the HRD increases from 55.4% (x = 0.1) to 67.5% (x = 0.3) and then decreases to 52.1% (x = 0.5). The cell volume reduction with increasing x is detrimental to hydrogen diffusion D and accordingly decreases the low temperature dischargeability of the La0.7-xCexMg0.3Ni2.8Co0.5 (x = 0.1-0.5) alloy electrodes.

BaLiF_3∶Ce~(3+)纳米粒子的制备及其光谱特性

BaLiF3属立方钙钛矿型复合氟化物,作为高效闪烁晶体可用于热中子检测[1].由于其能带隙宽,易于实现各种不同价态稀土离子掺杂,可以获得许多可调谐性质,因此它也是比较理想的光学功能材料的基质[2].Ce3+激活的BaLiF3晶体作为紫外发射的短波固体激光材料和光放大材料的研究多有报道[3~5].Ce3+的发射特性强烈依赖于基质晶体结构[6,7].氟化物基质中氧杂质的含量是影响光谱性质的重要因素[8].为了寻找氧含量低、发射波长更短、可调谐范围更宽的激光材料,本工作制备了BaLiF3∶Ce3+纳米晶,获得了一些新的有意义的实验结果.如果将其引入合适的聚合物基体制备出纳米复合体系,有可能为新一代杂化激光材料提供更理想的光学活性组分[9].1实验部分1.1仪器用日本R igaκu D/maxⅡB型X射线衍射仪(XRD)测量样品的晶体结构,辐射源CuKα1(λ=0·154 1 nm);用日本H itachi S-570环境扫描电子显微镜(ESEM)观察样品的形貌和粒径大小;用日立F-4500荧光光谱仪测试样品的激发和发射光谱;用英国VG公司ESCALAB MKⅡX射线电子能谱仪(XPS)检测样品的含氧量.1.2实验过...

4f~(N-1)5d组态自旋允许与禁戒跃迁能级的研究

通过稀土光谱理论,计算了三价稀土离子的4fN-15d组态能级的f与d电子间的库仑相互作用,结果表明对于重稀土元素,其自旋允许跃迁能级位置高于自旋禁戒跃迁能级位置,并且两种能级间的能级差随f电子数的增加而依次减小。对于轻稀土元素,则自旋禁戒跃迁能级位置高于自旋允许跃迁能级位置。结果很好地解释了自旋禁戒跃迁能级的光谱现象。

Investigation on acute biochemical effects of Ce(NO3)(3) on liver and kidney tissues by MAS H-1 NMR spectroscopic-based metabonontic approach

High resolution magic angle spinning (MAS)-H-1 nuclear magnetic resonance (NMR) spectroscopic-based metabonomic approach was applied to the investigation on the acute biochemical effects of Ce(No-3)(3). Male Wistar rats were administrated with various doses of Ce (NO3)(3)(2, 10, and 50 mg(.)kg(-1) body weight), and MAS H-1 NMR spectra of intact liver and kidney tissues were analyzed using principal component analysis to extract toxicity information. The biochemical effects of Ce (NO3)(3) were characterized by the increase of triglycerides and lactate and the decrease of glycogen in rat liver tissue, together with an elevation of the triglyceride level and a depletion of glycerophosphocholine and betaine in kidney tissues. The target lesions of Ce (NO3)(3) on liver and kidney were found by MAS NMR-based metabonomic method. This study demonstrates that the combination of MAS H-1 NMR and pattern recognition analysis can be an effective method for studies of biochemical effects of rare earths.

Hydrothermal syntheses and crystal structures of bimetallic cluster complexes [{Cd(phen)(2)}(2)V4O12]center dot 5H(2)O and [Ni(phen)(3)](2)[V4O12]center dot 17.5H(2)O

The hydrothermal reactions of vanadium oxide starting materials with divalent transition metal cations in the presence of nitrogen donor chelating ligands yield the bimetallic cluster complexes with the formulae [{Cd(phen(2))(2)V4O12].5H(2)O (1) and [Ni(phen)(3)](2)[V4O12] . 17.5H(2)O (2). Crystal data: C48H52Cd2N8O22V4 (1), triclinic. P (1) over bar, a = 10.3366(10), b = 11.320(3), c = 13.268(3) Angstrom, alpha = 103.888(17)degrees, beta = 92.256(15)degrees, gamma = 107.444(14)degrees, Z = 1; C72H131N12Ni2O29.5V4 (2), triclinic. P (1) over bar, a = 12.305(3), b = 13.172(6), c = 15.133(4), alpha = 79.05(3)degrees, beta = 76.09(2)degrees, gamma = 74.66(3)degrees, Z = 1. Data were collected on a Siemens P4 four-circle diffractometer at 293 K in the range 1.59degrees < theta < 26.02degrees and 2.01degrees < 0 < 25.01degrees using the omega-scan technique, respectively. The structure of 1 consists of a [V4O12](4-) cluster covalently attached to two {Cd(phen)(2)}(2+) fragments, in which the [V4O12](4-) cluster adopts a chair-like configuration. In the structure of 2, the [V4O12](4-) cluster is isolated. And the complex formed a layer structure via hydrogen bonds between the V4O12](4-) unit and crystallization water molecules.

3{1-[2-(-3-羟基-1-甲基-2-亚丁烯氨基)-苯亚氨基]-乙基}4-甲硫基-2,4-戊二烯-2-醇的不对称Schiff碱镍(Ⅱ)配合物的合成、结构和性质

由 5-(2-乙酰基-1-甲硫基-3-羰基-亚丁基)-丙二酸亚异丙酯 (1)与邻苯二胺及乙酸镍()经一步反应合成了3{1-[2-( -3-羟基-1-甲基-2-亚丁烯氨基)-苯亚氨基 ]-乙基} 4-甲硫基-2,4-戊二烯-2-醇(3)的不对称四齿 Schiff碱镍()配合物(2),X射线衍射结果表明,配合物 2属单斜晶系,P21/C空间群.a=1.1476(2)nm,b=1.1782(2)nm,c=1.4810(3)nm;β=111.73(2)°,V=1.8602(7)nm3,Z=4,Rf=0.0535.电化学(循环伏安)测定结果表明,该配合物在测定条件下(阳极峰电位为1.1)发生了不可逆的氧化-还原反应.

Synthesis and structural characterization of organolanthanide complexes with 1,2-dicarba-closo-dodecaborane-1,2-dichalcogenolate ligands

Reactions of anhydrous LnCl(3) (Ln = Nd, Gd, Dy, Er, Yb) with 2 equiv of LiCp' in THF afford the lanthanocene complexes Of CP'(2)Ln(mu-Cl)(2)Li(THF)(2) (CP' = eta(5)-t-BuC5H4, Ln = Nd (1), Gd (2), Dy (3), Er (4), Yb (5); Cp'= 1,3-eta(5)-t-Bu2C5H3, Ln = Nd (6), Gd (7), Dy (8), Er (9), Yb (10)). The molecular structures of 7 and 8 were characterized by X-ray crystallographic analysis. In these complexes, two Cp' ring centroids and two it-bridging chloride atoms around the lanthanide atoms form a distorted tetrahedron. The insertion of elemental chalcogen E (E = S, Se) into Li-C bonds of dilithium o-carborane in THF solution afforded dimers of dilithium. dichalcogenolate carboranes, [(THF)(3)LiE2C2B10H10Li(THF)](2) (E = S (12a), Se (12b)), which were confirmed by a crystal structure analysis. Reactions Of Cp'(2)Ln(mu-Cl)(2)Li(THF)(2) (1-10) with 12a or 12b gave dinuclear complexes of the formula [Li(THF)(4)](2)[Cp'(2)LnE(2)C(2)B(10)H(10)](2) (Cp'= eta(5)-t-BuC5H4, E = S, Ln = Nd (13a), Gd (14a), Dy (15a), Er (16a), Yb (17a); E = Se, Ln = Nd (13b), Gd (14b), Dy (15b), Er (16b), Yb (17b); Cp'= 1,3-eta(5)-t-Bu2C5H3 E = S, Ln = Nd (18a), Gd (19a), Dy (20a), Er (21a), Yb (22a); E = Se, Ln = Nd (18b), Gd (19b), Dy (20b), Er (21b), Yb (22b)). According to the X-ray structure analyses, the dianions of 13a and 13b contain two o-carborane dichalcogenolate bridges, and each CP'2Ln fragment is attached to one terminal and two bridging chalcogen ligands. The central Ln(2)E(2) four-membered ring is not planar, and the direct metal-metal interaction is absent.