葡萄属营养器官的比较解剖学及其系统学意义

本文对国产葡萄属24个种、6个变种和4个美洲种进行了比较解剖学研究。比较观察了茎、节、叶柄、叶片的维管系统、厚角组织、厚壁组织、毛状体、后含物、叶表皮角质等解剖学特征。并讨论了它们在系统学上的意义

BOUNDARY COLLOCATION METHOD FOR TWO DIMENSIONAL LINEAR WAVE PROBLEM

Boundary Collocation Method （BCM） based on Eigenfunction Expansion Method （EEM） was developed as a new numerical method for two-dimensional linear theory of water waves. The model was not restricted to rectangular objects, but a partly-submerged triangl

边界配点法在二维线性水波问题中的应用

Boundary Collocation Method （BCM） based on Eigenfunction Expansion Method （EEM） was developed as a new numerical method for two-dimensional linear theory of water waves. The model was not restricted to rectangular objects, but a partly-submerged triangl

李群法在水波方程中的应用

引入李群法对二维水波控制方程Laplace方程作群变换,利用同一解曲面的几何条件对其李代数进行降维,并借助于Mathematica计算软件,得到该控制方程的无限李群解,在考虑某边值问题的情况下,得出此问题的解析解。用李群法完成Laplace方程通解和某一特定边界条件特解的推导计算,证明了该方法的可行性

4种蔷薇属植物叶片黄酮含量的季节性变化

采用 HPL C法对刺梨 ( Rosa roxburghii Tratt.)等 4种蔷薇属植物在不同生长季节叶片的总黄酮甙含量和甙元配比进行了分析测定。结果表明 :不同采摘期的华西蔷薇 ( R.moyesii Hemsl.et Wils.)、绣球蔷薇 ( R.glomerata Rehd.et Wils.)和峨嵋蔷薇 ( R.omeiensis Rolfe)的叶片总黄酮甙含量有较大的差异 ,一般在展叶期黄酮含量较低 ,随后叶片黄酮含量升高 ,果实成熟后叶片黄酮含量又降低 ;三个种叶片的总黄酮甙平均含量分

二聚酸抗磨剂对航空煤油润滑性的影响Effects of dimer acid antiwear agent on lubricity of jet fuel

为考察二聚酸抗磨剂对加氢精制航空煤油润滑性的改善作用，同时验证不同二聚酸抗磨剂的改善效果，分别采用桐油、棉籽油及妥尔油酸为原料进行了二聚酸的合成与精制，利用液相色谱仪、红外光谱仪、核磁共振波谱仪等验证了桐油基、棉籽油基及妥尔油酸基二聚酸的分子结构，采用球柱润滑性评定仪（BOCLE）法和高频往复试验机（HFRR）法考察了3种不同原料来源的二聚酸对航空煤油润滑性的改善作用，用显微镜分析试验球的磨痕形貌，并提出抗磨机制。结果表明：随着二聚酸添加量的不断增大，磨痕直径、表面划痕及深度不断减小；在BOCLE法中，当二聚酸添加量为20 mg/L时，3种二聚酸均可使航空煤油润滑性磨痕直径从0.92 mm降到0.65 mm以下，满足GB 6537—2018《3号喷气燃料》要求；在HFRR法中，当二聚酸添加量为50 mg/L时，3种二聚酸均可使润滑性磨痕直径降到550 μm 以下，平均摩擦系数降到0.265以下，平均成膜率达到24%以上，且平均摩擦系数和平均成膜率的变化规律与二聚酸对航空煤油润滑性改善规律一致；制备的二聚酸均具有长碳链和羧基官能团，羧基通过强电负性吸附在金属表面，羧基之间的氢键以及非极性端通过范德华力等使二聚酸分子形成平行分子簇，进而在金属表面形成有效的润滑膜，阻止两摩擦副之间发生直接接触与摩擦。综上，3种二聚酸的润滑能力相当，均显示出良好的润滑性能。 In order to investigate the improvement of lubricity of dimer acid antiwear agents on jet fuel and verify the improvement effects of different dimer acids antiwear agents,dimer acids were synthesized and refined from tung oil, cottonseed oil and tall oil fatty acids, respectively, and their molecular structures were verified by liquid chromatography, FT-IR spectrometer and NMR spectrometer. The effects of cottonseed oil-based dimer acid, tung oil-based dimer acid and tall oil fatty acids-based dimer acid on the lubricity of jet fuel were investigated by BOCLE and HFRR tests. The wear scar morphology of the test ball was analyzed by measuring microscope and the antiwear mechanism was proposed. The results showed that with the increase of the dosage of dimer acid, the wear scar diameter, surface scratch and depth decreased. In BOCLE test, 20 mg/L dosage of dimer acids from three different raw materials could reduce the wear scar diameter of jet fuel from 0.92 mm to less than 0.65 mm ,meeting the requirement of GB 6537-2018 No.3 jet fuel. In HFRR test, when the dosage of three dimer acids was 50 mg/L, the wear scar diameter of lubricity and the average friction coefficient could be reduced below 550 μm and 0.265 respectively, and the average film formation rate could reach above 24%. The variation of the average friction coefficient and average film formation rate was consistent with the improvement rule of dimer acid on the lubricity of jet fuel. The dimer acids prepared had long carbon chains and carboxyl functional groups. The carboxyl group was adsorbed on the metal surface through strong electronegativity, the hydrogen bond with carboxyl groups and the non-polar end through Van Der Waals force made the dimer acid molecules form parallel molecular clusters, and then formed an effective lubrication film on the metal surface to prevent direct contact and friction between the two friction pairs. In conclusion, the three dimer acids have the uniform lubrication ability, and show good lubrication performance

岷江上游典型退化生态系统恢复重建研究与示范

岷江项目在我国西部典型的生态脆弱地带-岷江上游地区，建立了拥有2大系统（恢复系统、支撑系统）的3段示范区（亚高山、中山、干旱河谷）的二元恢复体系，构建了3大类13个生态恢复重建组合模式，提供了适宜的试验示范技术体系22套，并编制了技术应用指南6套，SOP 11个；建立示范区2万多亩；首次大规模筛选并繁育出43种乡土阔叶树种优质苗木，共3050万株；在茂县、理县、松潘等地建立了130余亩植被恢复与优良经济植物的繁育基地和400余亩的草种基地，推动了生态建设思路从单纯造林向生态功能提高的转变。试验成功的技术与模式在高山峡谷区“天然林保护工程”和“退耕还林工程”中推广应用32万余亩。项目成果不仅会显著促进整个岷江上游山地生态功能恢复，而且对长江生态屏障建设也将产生深远的影响