紫叶稠李在兰州地区的嫩枝扦插技术

以紫叶稠李半木质化枝条为材料,进行全光喷雾嫩枝扦插,采用50×10^-6、100×10^-6、200×10^-6、500×10^-6、1000×10^-6等不同浓度的ABT1号生根粉水溶液泥浆蘸根处理紫叶稠李插穗基部,结果显示,200×10^-6的ATB1号生根粉可显著地提高生根率,其生根率最高可达78．5％。     

关于Ka算子与第二Kato谱

给出Ka算子的定义,讨论N(Ta)与R(Tb)的关系,得到闭子空间Y在T作用下的象T(Y)成为闭子空间的一些条件,进而证明当T∈Φ (X)时,从R∞(T)到R∞(T)的算子T|R∞(T)是个满射,同时证明当N(T)(∈)R∞ (T)时,T|R∞(T)也是个满射,从而说明当T是Ka算子时,T|R∞(T)是个满射;给出第二Kato谱σ'k(T)的定义,证明了σ'k(T)是C中的非空紧子集,也证明了σ'k(T)=σ'k(T*),并讨论σ'k(T)的一些性质以及σ'k(T)与一些常见的本性谱的关系,说明σd(T)(∈)σ'k(T)(∈)σ(T)、σ'k(T)σB(T)≠(φ)、σk(T)\σ'k(T)≠(φ)、(∈)(T)∩σ'su(T),而且说明当TS=ST时,若TS∈Ka(X),则T∈Ka(X)且S∈Ka(X).     

油井水泥缓凝剂乙二胺四亚甲基膦酸盐的研制与应用

针对深井固井高温环境下水泥浆稠化时间和抗温性能难以满足现场施工的问题,研制了一种抗温抗盐缓凝剂乙二胺四亚甲基膦酸盐(EDTMP),考察了EDTMP的热稳定性、高温缓凝性能、抗盐性能、配伍性能以及其对水泥石抗压强度的影响.将EDTMP与其他缓凝剂作了对比,探讨了EDTMP的缓凝机理,并进行了现场试验.结果表明,EDTMP可抗170℃的高温,加量少,稠化时间可调,过渡时间短;对NaCl不敏感,对水泥石抗压强度无影响,与其他外加剂有很好的配伍性;EDTMP稠化曲线较理想,没有出现稠化曲线不稳定和水泥浆性能不稳定的现象.该缓凝剂能较好地适应高温环境、盐膏层和长封固段,现场试验取得了很好的效果.     

A quantum algorithm for the dihedral hidden subgroup problem based on lattice basis reduction algorithm

To optimize the algorithms for the dihedral hidden subgroup problem, we present a new algorithm based on lattice basis reduction algorithm. For n 〈 120, we reduce the dihedral hidden subgroup problem to shortest vector problem. A subroutine is given to get a transition quantum state by constructing a phase filter function, and then the measurement basis are derived based on the lattice basis reduction algorithm for solving low density subset sum problem. Finally, the parity of slope s is revealed by the measurement. This algorithm needs preparing mn quantum states, m qubits to store and O（n2） classical space, which is superior to existing algorithms.     

一种弱双曲集上的强伪轨跟踪性

研究了Banach空间上的C1映射在一种弱双曲集即Steinlein-双曲集上的强伪轨跟踪性,得到了广义的跟踪性引理.设H为一个Banach空间,V是H的一个开子集,φ:V→H为C1映射,如果T(∪)V是φ的Steinlein-双曲集合,则C1映射φ在Steinlein-双曲集T上具有强伪轨跟踪性.     

1，10-菲罗啉衍生物的合成途径及其展望

由于1,10-非罗啉及其衍生物独特新颖的结构和性质,使它们成为合成新的化合物的前体.因此以1,10-菲罗啉为母体的合成化学是有机合成中的一个热点,这些衍生物将成为医药、农药、物理化学、材料科学和生命科学等领域的重要物质.介绍了合成1,10-菲罗啉及其衍生物的各种新方法和技术,这些方法也将丰富有机合成化学,并将成为合成这类特殊化合物的专一性手段.     

A rough set approach to feature selection based on scatter search metaheuristic

Rough set theory is an effective method to feature selection, which has recently fascinated many researchers. The essence of rough set approach to feature selection is to find a subset of the original features. It is, however, an NP-hard problem finding a minimal subset of the features, and it is necessary to investigate effective and efficient heuristic algorithms. This paper presents a novel rough set approach to feature selection based on scatter search metaheuristic. The proposed method, called scatter search rough set attribute reduction （SSAR）, is illustrated by 13 well known datasets from UCI machine learning repository. The proposed heuristic strategy is compared with typical attribute reduction methods including genetic algorithm, ant colony, simulated annealing, and Tabu search. Computational results demonstrate that our algorithm can provide efficient solution to find a minimal subset of the features and show promising and competitive performance on the considered datasets.     

弱混合子集的等价定义及其应用

弱混合子集和传递子集分别是拓扑弱混合和拓扑传递的局部化概念,它们是用来描述动力系统回复性的局部性质.给出了弱混合子集的等价定义并且讨论了它们在集值离散动力系统上的应用,证明了原系统有弱混合子集当且仅当它诱导的集值离散动力系统有传递子集,结果推广和提升了Banks的结论.