新型植物生长阻滞剂A_1的合成

新型植物生长阻滞剂N,N,N—三甲基-N-[4-(2′,6′,6′—三甲基—2′—环己烯—1′—基)3—丁烯—2—基]—碘化铵。它是近年人工合成的、目前最高效的植物生长阻滞剂。“A_1”是代号。它的结构式如下: 日本将A_1应用于水稻、黄瓜和番茄等幼苗的试验,阻滞效果比Amo1618[即2—异丙基-4-(三甲基氯化铵)-5-甲基—苯基呱啶羧酸酯)和B_9[即N,N—二甲基胺基琥珀酰胺酸]显著。     

相对调和映照与光滑映照的变分

相对调和映照即为满足守恒律的映照。本文研究了相对调和映照的复合性质及它们与相对仿射映照之间的关系,并把稳定调和映照的一些不存在性定理对相对调和映照作了推广。     

70B_2风机模型实验与性能曲线讨论

通过风机模型实验结果分析,对风机性能曲线进行探讨,提出风机实验方法及参数测定,得出性能曲线在驼峰左侧不稳定区曲线呈现不连续——称日曲线断裂,并略述产生的原因.同时指出曲线驼峰左侧“减阻”实验曲线滞后于“加阻”实验曲线等一些新概念.     

异种DNA对胚胎发育的影响

有平衡器之东方蝾螈的DNA和无平衡器之黑斑蛙DNA当分别注射至黑斑蛙的受精卵内时.两者都能使受注射卵发育成的有些蝌蚪在左鳃盖上具有类似平衡器的突出物.基于这些事实,可以推论蝌蚪的类似平衡器的突出物既不是由于遗传转化,也不是平衡器的诱导而是DNA对胚胎发育的非特异性效应.     

数字图书馆建设中知识产权保护问题探析

知识产权保护是数字图书馆建设的瓶颈问题.在数字图书馆建设中,首先要在全社会范围内开展合理、合法地利用信息资源的宣传教育活动,其次要充分利用法律武器保护知识产权,确立图书馆在知识经济社会中作为信息服务的中心地位.数字图书馆建设必须与知识产权保护同时进行,才能在保护知识产权的同时更有效的促进数字图书馆建设和发展.     

户内开关设备和控制设备中关于母线的几个问题

对开关设备和控制设备的母线载流量、热效应、电动力效应进行归纳和分析,根据相关的国家标准和电力标准对母线的选用和实际应用提出建设性的意见.     

Structural Stability of CaCuMn6O12 under High Pressure and Low Temperature

In situ high pressure energy-dispersive x-ray synchrotron radiation diffraction and resistance experiments are carried out on CaCuMn6O12. Its crystal structure is stable in the measured pressure range. The equation of state of CaCuMn6O12 is obtained from the V/Vo - P relationship （V and Vo are the volumes at pressure P and at atmosphere）. The bulk modulus Bo is calculated based on the Birch-Murnaghan equation. Low temperature x-ray diffraction shows no phase transition occurring down to 160K.     

Shear Viscosity to Non-Equilibrium Entropy Density Ratio of Hot Quark-Gluon Plasma at Finite Chemical Potential

In the framework of irreversible thermodynamics, we study the transport properties of hot quark-gluon plasmas. The viscous entropy production at finite chemical potential as well as the shear viscosity to non-equilibrium entropy density ratio is investigated in weakly coupled limit by using kinetic theory. The results show that the chemical potential contributes positively to their ratio compared to the pure temperature case. The ratio exhibits two boundaries in the coupling strength in which a minimum value of 0.42 is found at αs=0.6.     

Near-Field Fluorescence and Topography Characterization of a Single Nanometre Fluorophore by Apertureless Tip-Enhanced Scanning Near-Field Microscopy

Tip-enhanced near-field fluorescence and topography characterization of a single nanometre fluorophore is conducted by using an apertureless scanning near-field microscopy system. A fluorophore with size 80hm is mapped with a spatial resolution of 10hm. The corresponding near-field fluorescence data shows significant signal enhancement due to the apertureless tip-enhanced effect. With the nanometre spatial resolution capability and nanometre local tip-enhanced effect, the apertureless tip-enhanced scanning near-field microscopy may be further used to characterize a single molecule by realizing the local near-field spectrum assignment corresponding to topography at nanometre scale.     

N-^-N圈传播子极点漂移小量换序计算

采用核子N（反核子^-N）与中性介子π^2相互作用的Lorentz不变耦合模型，对N-^-N圈图传播子在动量重整化方案中的有限量函数∑c（p）的严格解析计算问题，从极点漂移小量ε作换序计算角度进行了深入的分析、探讨后，发现传播子四维动量平方P^2〉-（核子质量＋介子质量）^2时可作合理换序计算处理．若将此计算结果延拓到P^2≤-（核子质量＋介子质量）^2时，发现与正规计算方法获得的计算结果近似符合程度并非十分理想．