多属性决策的组合赋权法

鉴于多属性决策问题中主观赋权法和客观赋权法各有其自身固有的特点，本文依据优化理论提出一种集成方法确定属性权重，该方法既充分利用客观信息，又反映决策者的主观偏好，从而使确定的属性权重更加合理、实用．     

Structure of Cytochromec and Its Platinum-modified Derivatives by Fourier Transform Infrared Spectroscopy

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新重丰中子同位素239Pa

用50MeV/u ¹⁸O离子同天然铀靶反应产生了新重丰中子同位素²³⁹Pa.用放射化学法从反应产物中分离Pa活性,通过观测²³⁹Pa及子体²³⁹U衰变所得到的结果显示:首次合成和鉴别了新重丰中子核素²³⁹Pa,并测定出²³⁹Pa的半衰期为106±30min.     

禽肉中克球酚气相色谱微量快速测定法

对禽肉样品中克球酚药物残留采用微量化学法技术，以甲醇提取，氧化铝、阴离子树脂交换柱净化，乙酰化后，进行ＧＣ－ＥＣＤ毛细管色谱测定。经对肉鸡、填鸭、饲养山鸡进行添加回收率试验，方法回收率为８５．７％～９４．４％，变异系数为３．８％～７．７％，最低检出限为２．０ｎｇ／ｇ。     

175Er的衰变纲图

用14MeV中子照射天然Yb靶,通过¹⁷⁶Yb(n,2p)¹⁷⁵Er反应产生了新的重丰中子同位素¹⁷⁵Er,借助X-γ,γ-γ符合测量方法,首次鉴别出了¹⁷⁵Er,并测得其半衰期为(1.2±0.3)min.同时还观察到了¹⁷⁵Er衰变所发射的8条新γ射线,建立了¹⁷⁵Er的部分γ衰变纲图,从中指定了¹⁷⁵Tm的一个基态转动带.     

金水六君煎胶囊多指标成分分析

采用薄层扫描法、紫外分光光度法分别对金水六君煎胶囊中有祛痰作用的β-谷甾醇和总生物碱进行含量测定。 β-谷甾醇平均回收率为 10 0 .6 % (n=5 ) ,RSD为 2 .77% ;总生物碱平均回收率为 98.4 %(n=5 ) ,RSD为 2 .16 %。该方法简单快速、结果准确、精密度较高 ,可用于该制剂的质量控制。     

Thermal Diffusion with Chemical Reaction: A Carrier System

The heat of transport of oxygen across a membrane mediated by hemoglobin (Hb) as a carrier is iuvestigated by the method of irreversible thermodynamics. It is assumed that oxygen combines with hemoglobin molecules to form oxyhemoglobin according to the reaction nO₂ + Hb=HbO_zn. The oxyhemoglobin molecule HbO_zn then migrates to a new position and is reconverted to Hb by releasing oxygen. It is shown that the heat of transport of oxygen consists of two contributions; one due to the reaction and the other from thermal diffusion of individual species present. Total oxygen flux across the membrane is also calculated in terms of temperature and the chemical potential difference of oxygen across the membrane. The use of the heat of transport as a measure of the efficiency of the heat pump for the carrier-mediated transport process is investigated.     

Coherent structures of the turbulent round jet in different focal lengths

Graphical abstract  

     

The number of nonseparable maps on the projective plane

In this paper, we study the rooted nonseparable maps on the sphere and the projective plane with the valency of root-face and the number of edges as parameters. Explicit expression of enumerating functions are obtained for such maps on the sphere and the projective plane. A parametric expression of the generating function is obtained for such maps on the projective plane, from which asymptotic evaluations are derived. Moreover, if the number of edges is sufficiently large, then almost all nonseparable maps on the projective plane are not triangulation.