多经济指标下对各部门综合评价的一种方法

对各部门多经济指标建立相应的数学模型,通过构造排序矩阵,用最大元素法给出综合评价各部门情况的一种方法,利用实例验证了该方法在实际中具有可行性和可操作性.     

N-(2-甲氧羰基-1-甲基)-乙基-(N′-D-乙酰基吡喃型糖)硫脲类化合物的合成及生物活性

N-(2-甲氧羰基-1-甲基)-乙基-(N′-D-乙酰基吡喃型糖)硫脲类化合物的合成及生物活性;糖基硫脲;β-氨基丁酸;合成;生物活性     

电感耦合等离子体质谱法测定城市污泥中重金属的活性形态

以沈阳北部、满堂河、仙女河三个污水处理厂的污泥为研究对象,选择水、醋酸和不同极性的有机溶剂对其进行浸提分离,采用ICP-MS测定了污泥中主要污染的重金属元素各活性形态的含量,并探讨了Cr,Cu,Zn,Cd和Pb随环境条件的改变其活性形态含量的变化规律及其影响因素。结果表明：城市污泥中重金属的醋酸浸提态含量较高,水溶态含量较低,二者随时间和温度条件的变化呈一致的规律性,有机浸提态重金属的含量与溶剂极性大小呈正相关性。醋酸浸提态重金属在迁移转化过程中具有较大活性,同一形态重金属的活性次序为：水溶态Zn＞Cu＞Cd＞Pb＞Cr,醋酸浸提态Cd＞Cr＞Cu＞Zn＞Pb,有机浸提态Pb＞Cd＞Cr＞Cu＞Zn。     

A Concise and Stereoselective Synthesis of Cathasterone＇s Side Chain

Introduction Brassinolide (compound 1) and cathasterone (compound 2)(Scheme 1), which is the biosynthetic precursor of compound 1, are a new type of promoting materials for plant growth^[1,2]. Owing to their novel structural features and their remarkable physiological activities, much effort has been made to develop the methods for the synthesis and biosynthesis of compound 1^[3],     

AIE Ligand Constructed Zn(Ⅱ)Complex with Reversible Photo-induced Color and Emission Changes

Fluoran salicylaldehyde hydrazone metal complex(FSHMC)is a kind of recently reported photo-responsive system,which has the advantages of simple synthesis,multiple colors as well as distinct color change before and after UV light irradiation.However,the emission property of FSHMC is relatively unitary.In solid state,especially,only fluorescence quench is induced after UV light irradiation,which limits their applications.In this work,a typical aggregation-induced emission(AIE)moiety of tetraphenylethene(TPE)was introduced to the design of FSHMC.The obtained FSHMC,2-Zn,exhibited reversible color and fluorescence changes upon UV light irradiation.Due to the AIE feature of compound 2,2-Zn exhibited different emission changes upon UV light irradiation in THF and in solid matrix,because of the fluorescence resonance energy transfer(FRET)process from TPE moiety to rhodamine B moiety.     

返航备降航班高风险频发子集搜索模型

返航备降航班是一种保证航空安全的有效措施,但返航备降航班会带来成本损失,所以对返航备降业务规律进行分析,从而重点监控,在确保安全生产的基础上,有效降低返航备降航班的经济损失。我们可以把确定返航备降航班发生的密集时间段描述为一个多属性空间搜索问题,在许多实践领域存在该类问题,比如商业银行对贷款客户的信用评级、绩效考核等。在多属性组成的多维空间中,存在许多正常点和不正常点,通过建立高风险频发子集搜索模型和算法确定不正常点比较密集的多属性范围,使得在该空间范围内不正常点的比例较高并且总的点的数量达到一定的水平。本文以航空公司安全生产为例,其模型结果在实际生产的运用中取得良好效果,在一年内避免30余班次返航备降。     

Application of the parametric formulae for electromagnetic showers in unconverted γ/π0 discrimination

In the LHC experiment,the neutral pions produced during jet fragmentation are the background sources for all physics channels with high-energy photons in their final state.In this paper,the application of the three-dimensional parametric formula for electromagnetic(EM)showers,which we developed in the Alpha Magnetic Spectrometer Ⅱ experiment,is presented to distinguish the unconverted photons from the neutral pions.With the constructed electromagnetic calorimeter(ECAL)in a GEANT4 simulation,the parametric formulae were validated and the unconverted γ/π0 discrimination was performed with the Toolkit for Multivariate Data Analysis(TMVA)package in ROOT for different transverse energies ranging from 15 GeV to75 GeV,which is the most sensitive region for light Higgs(with mass～120 GeV)searches with the channel H→γγ.With this discrimination method and the selected transverse energy region,we can reject π0 with the efficiency from～40%(65-75 GeV)to～90%(15-25 GeV)when keeping 90% γefficiency.     

立体图像质量的主观评价方案

立体图像质量评价在立体图像压缩、处理以及通信领域中有着十分重要的作用,一种好的立体图像质量客观评价方法也要依赖于立体图像的主观评价.本文基于人眼的立体视觉特性,提出了相对完整的立体图像质量主观评价方案,该方案主要分为立体图像库的建立、评测者的选择、观看条件的描述、评测者的训练和测试、数据处理和实验结果分析六个方面.实验中,评测者根据自己的主观感受,对所选取的立体图像进行评分,最后用数理统计理论对所得数据进行处理.结果表明,本文所提出的主观评价方案可行,能够正确反映立体图像质量的优劣.