甜樱桃果实呼吸强度和营养成分变化规律研究

对红艳、那翁两种甜樱桃果实在成熟期间呼吸强度、单果重和主要营养成分的变化进行了测定分析。结果表明：成熟过程中呼吸强度呈逐渐降低的趋势；单果重、可溶性固形物、还原糖和有机酸含量随果实的成熟而增高，有机酸含量达到最大值后开始下降；Ｖｃ含量以转色期最高，成熟后降低；氨基酸和单宁的相对含量在幼果中最多，随着果实的成熟逐渐减少。相关分析表明：呼吸强度、单果重、还原糖含量与开花后天数有显著的相关性。     

青钱柳资源培育与开发利用的研究进展

青钱柳是我国特有的珍稀单种属植物,也是国家重点保护的濒危植物之一.笔者在简述青钱柳的地理分布、形态特征和生长特性的基础上,总结了青钱柳种子的休眠原因及其解除方法、青钱柳苗木培育技术、青钱柳造林技术、青钱柳的化学成分、药用及保健功能等方面的研究进展,探讨了青钱柳人工林资源培育和青钱柳新产品开发应重点研究解决的问题和今后青钱柳开发利用的研究方向.     

棕色田鼠的种群年龄结构和密度关系分析

利用１７５７只棕色田鼠标本，以体重做指标，将棕色田鼠划分为５个年龄组，在此基础上分析了不同年度、不同月份、不同样方密度和年龄结构的相互关系，发现不同年份年亚成比越高，种群有增长的趋势，反之亦然；不同月份、不同样方，密度越高、亚成比越高．     

不同类型构树皮的纤维形态、化学组成与制浆性能研究

对金沙江干热河谷不同类型构树皮的化学组成、纤维特性与制浆性能进行分析.结果表明:构树皮纤维长,木素含量低,纤维素含量高,纤维形态好,易于成浆,可以作为纤维工业及造纸的优质原料.通过对3种构树类型的比较,得出红构皮的抽出物和木素含量低,综纤维素最高(67.48%),纤维最长(13.54 mm),长宽比也最大(728),成浆质量和制浆性能最好,为当地最优的构树类型;白花构皮纤维素含量和制浆得率较高,手抄片白度最大,综合经济价值相对较高;红花构虽然各项指标略低,但仍是一种较好的造纸原料.研究结果表明,红构与白花构可作为该地区建设造纸工业原料林的优先发展类型.     

桂林红粘土的物质组成及其工程地质性质特征

经差热、X衍射、扫描电镜鉴定和化学成分测试及近千组常规土工试验资料统计分析表明,物质成分上桂林红粘土主要由高岭石、伊利石、绿泥石等次生粘土矿物组成,并含有少量的蒙脱石、蛭石及混层矿物,铁铝氧化物高度富集,粘粒含量一般都在50%以上;工程地质性质上桂林红粘土具有天然含水量、孔隙比、液限及抗剪强度较高,容重、饱和度、比表面较大,压缩性、交换容量较低,透水性、崩解性较小及中-弱胀缩性等特点.     

Photoconductive organic materials for the near-IR radiation range

Polymer composition films based on polystyrene and containing electron donors, viz., substituted tetrathiafulvalenes, an electron acceptor, viz., 2,4,5,7-tetranitrofluoren-9-one, and sensitizers, viz., a cationic polymethine dye, 1,3,3-trimethyl-2-[3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)prop-1-en-1-yl]-3H-indolium tetrafluoroborate, and a neutral merocyanine dye, 5-{3-[(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]-2-phenyl-cyclopent-1-en-1-ylmethylene}-2-thioxodihydropyrimidine-4,6(1H,5H)-dione, were prepared. The internal photo effect upon film irradiation in the near-IR range is provided by low ionization potentials of the donors and the high electron affinity of the acceptor. The photoconductivity increases upon replacement of a cationic dye by a neutral one, mainly because of photogeneration of mobile charge carriers of both signs and a decrease in the activation energy for the photoconduction current. The decrease in the activation energy for the photocurrent is due to the fact that in the case of a neutral dye, the mobile charge carriers move away from each other during their separation, while in the case of a cationic dye, the colorless counterion strongly holds the photo generated charge carrier.Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1611–1617, August, 2004.     

Probe measurements in thermal plasma jets

Measurements of composition, temperature, and velocity in atmospheric argon plasma jets are reported, using enthalpy probes. The plasma jets are generated by a commercial type plasma gun and the measurements are expected to be of particular interest for industrial applications such as plasma spraying. Emphasis has been on the central and downstream regions of the plasma flame. The entrainment of air into the jet was found to be very high, even close to the axis of the jet. Gas samples analyzed with a gas chromatograph showed demixing of the air, i.e., nitrogen is more abundant in the jet than at room temperature. The high air entrainment has a strong cooling effect on the plasma, resulting in a rapid temperature drop along the axis. The influence of the argon flow rate and of the arc current on the jet's conditions was parametrically studied. Matching of the quantities measured in the jet with the torch input confirmed the validity of the results, and the relevance of enthalpy probe diagnostics in thermal plasma jets.     

野生番茄抗虫品种抗虫组分的GC-MS分析

番茄(lycopersiconesculentum)作为我国主要蔬菜,每年因其病虫害的发生,产量受到一定的制约。同时,化学农药的施用产生一系列问题如提高成本、污染环境、诱导害虫产生抗药性、危害消费者健康等。充分利用番茄属内丰富的野生抗虫、抗病资源,研究其中抗病虫害的化学活性物质,从而研究其机理,为培育抗虫抗病新品种具有非常重大意义。植物中的化学物质,特别是植物次生性代谢物质,在植物自身防御机制中起到相当重要的作用。有效利用植物中的化学物质防治害虫,探索新型生物合理性农药提供线索,与普通番茄相比,野生番茄[L.hirsutum]是番茄属中著名的抗虫野生种,对多种病害具有很强的抗性。美国学者自20世纪80年代就开始研究番茄的抗虫资源,发现L.hirsutum的腺毛分泌物中含有多种天然抗虫物质,对白粉虱、红蜘蛛和蚜虫等有驱避抗性,在田间表现出显著的抗蚜虫、斑潜蝇的特性,本实验通过对引种的抗虫番茄[L.hirsutum]叶片提取物的气相色谱质谱分析,鉴定出25种次级代谢产物及它们的百分含量。     

Stability and activity of Pd nanoparticles on silica and ultradispersed diamond

The influence of the nature of M_nO_m and treatment temperature of zirconia-based systems M_nO_m−ZrO₂ (M=Ca, Ba, Sm, Yb) of approximately equimolar composition on their phase composition and dispersity has been studied. The samples are shown to contain solid solutions based on cubic ZrO₂. Besides, CaZrO₃ perovskite is present in the CaO−ZrO₂ system, and a solid solution based on Sm₂O₃ is present in the Sm₂O₃−ZrO₂ system. The particle sizes in the corresponding solid solutions vary from 25 to 150 ?, while in the perovskite phase they are in the 300–500 ? range, with the treatment temperature increasing from 623 to 1273 K.     

关于正整数的有序分拆的Inplace恒等式的一些注记

本文给出了一类特殊的称之为Inplace有序分拆的两个递推关系式的组合证明. 同时, 我们也得到了关于Inplace 1-2 有序分拆,回文的有序分拆的一些新的恒等式.