基于DEA的两阶段系统的利润无效率测量和分解

利润无效率的测量是经济领域的一个研究热点,然而,现有的方法大多忽视物质守恒原则.文章基于数据包络分析(data envelopment analysis,DEA)方法,以存在资源共享和非期望产出的两阶段系统为研究对象,提出了满足物质守恒原则的利润无效率测量模型.此外,文章还提出了一种利润无效率的分解方法,将利润无效率分解为3个组成部分:技术无效率、共享资源配置利润无效率和剩余资源配置利润无效率.最后,本文通过一个随机的算例来阐述新方法.与以往的分解方法相比,该方法可以进一步分解利润无效率并帮助决策者更准确地识别导致利润无效率的原因.     

80Rb的旋称劈裂反转及负宇称带的回弯

通过熔合蒸发反应⁶⁵Cu+¹⁹F,⁶⁶Zn+¹⁸O及⁶⁸Zn+¹⁶O,在3种入射束流的能量分别为75MeV,76MeV及80MeV研究了⁸⁰Rb高自旋态的能级结构.增加了20多条新的γ跃迁,在已知负宇称转晕带上建立了两条新的边带.将原有的第二条负宇称带的自旋态从12^－推高到了22^－,并首次观察到这个带的回弯,它的回弯频率为0.49MeV;负宇称转晕带在15^－时出现了旋称反转,第二负宇称带存在明显的旋称劈裂,但没有观察到旋称反转,这两条负宇称带的结构均与其同中子数核⁸²Y非常相似.     

Negative Parity Bands and Signature Splitting Inversion in ^80Rb

High spin states in ^80Rb were studied via the ^65Cu ^19F, ^66Zn ^180 and ^68Zn ^160 reactions. The 75-MeV ^19F,76-MeV ^180 and 80-MeV ^160 beams were provided by the CIAE HI-13 Tandem accelerator and the JAERI Tandem accelerator. The prompt γ-γ coincidence and the directional correlation from oriented nuclei (DCO)were measured by the detector arrays in CIAE and JAERI. Twenty-three new states with 28 new transitionshave been assigned to ^80Rb. The states were observed up to spins of 20^ and 22^- in the α= 0 branch for thepositive and negative parity yrast bands respectively. The negative parity non-yrast bands were significantlyextended up to spins of 22^- and 15^-. The band crossings with frequencies 0.51 MeV and 0.61 MeV in the α= 0cascade were observed for the first time. The signature splitting was observed in both negative parity bands. Thesignature inversions at spins of about 7h and 15h were observed.     

面向21世纪大学数学教学改革的探讨(续二)

三、改革的指导思想及主要原则 (一)大学数学教育改革的指导思想 随着数学在现代社会中的作用和地位逐渐为人们所认识,必然使得大学数学基本课程的结构及其内容的改革,引起各方的深切关注.     

Shape co-existence and structural evolution of the Vi13/2 band in 157Yb

The high-spin states of 157Yb have been studied via the reaction of 144Sm(16O, 3n) at 16O energy of 90 MeV using techniques of in-beam γ-ray spectroscopy. Measurement of γ-γ-t coincidences was performed with 11 BGO(AC)HPGe detectors. Based on the γ-γ coincidence relationships and the measured results of γ-ray anisotropies and DCO ratios, the level scheme for 157Yb was established. The shape co-existence and structural evolution of the Vi13/2 band with increasing angular momentum in 157Yb have been discussed. The systematics of the Vi13/2 bands in the N = 87 odd-A isotones have been compared.     

106Ag手征性实验研究

利用能量为60MeV的¹¹B束流, 通过¹⁰⁰Mo(¹¹B, 5n)¹⁰⁶Ag熔合蒸发反应布居¹⁰⁶Ag的高自旋态, 用15台带BGO反康的HPGe探测器进行在束γ谱学测量. 通过γ-γ符合矩阵开窗分析和DCO比值分析, 建立了¹⁰⁶Ag新的能级纲图, 观测到26条新γ跃迁. 与相邻同位素奇奇核¹⁰⁴Rh比较, ¹⁰⁶}Ag中带1和带2具有A≈100区手征二重带的3个特征, 推测它们可能是基于πg_9/2⊙υh_11/2组态的手征二重带. 但它们的角动量顺排不一致, 在实验上还需进一步的测量研究.     

基于蛋白A定向固定的Love波免疫传感技术研究

报道了一种基于蛋白A固定技术的新型Love波免疫传感器,可用于检测B型葡萄球菌肠毒素(SEB).本传感器由压电石英基片、叉指换能器和SiO2声波导层构成.为提高传感器对SEB分子的响应能力和检测灵敏度,设计了抗体分子的蛋白A定向固定路线,通过APTES和戊二醛层交联蛋白A,随即用100mmol/LNaBH4还原蛋白A与戊二醛层之间形成的Schiff's base结构,实现抗体分子在Love波器件表面高效率的定向固定.该固定化方案使传感器的再生能力和检测灵敏度都得到显著提高,对10 mg/L SEB进行连续5次检测后,其响应能力没有明显下降;而对SEB的浓度检出限度达到了10μg/L.原子力显微镜对传感器表面形态的成像结果表明,与戊二醛共价交联法相比,蛋白A结合法使抗体分子探针在传感器表面拥有更高的覆盖度和活性,对SEB具有更强的结合能力.     

High-spin states and signature inversion in odd-odd 182Au

High-spin states in 182Au have been produced and studied via the 152Sm(35Cl,5nγ)182Au reaction. The level scheme consisting of the πh9/2(*)Vi13/2 and πi13/2(*)V i13/2 bands has been established for the first time. The low spin signature inversion in both bands has been found. The observed signature inversion phenomena can be interpreted qualitatively using the pairing and deformation self-consistent cranked Wood-Saxon calculations.     

利用LNG冷能的混合工质中低温热力循环开拓研究

为提高中低温余热回收动力系统性能,本文在常规混合工质热力循环（火用）分析基础上,提出了结合LNG冷能利用的新型混合工质热力循环。通过与LNG的有机结合,混合工质热力循环热效率提高14.5个百分点,（火用）效率达到53.6％。为进一步揭示效率提高的原因,我们比较了常规混合工质热力循环与LNG-混合工质热力循环的（火用）损失变化情况。结果表明:LNG-混合工质热力循环高效的关键在于循环平均放热温度的降低以及工质蒸发过程与冷凝过程换热的合理匹配。而LNG冷能的梯级利用则是系统具有较高（火用）效率的根本原因。     

155Tm核的能级结构

通过重离子熔合蒸发反应¹⁴²Nd(¹⁹F, 6n)¹⁵⁵Tm来布居¹⁵⁵Tm核的高自旋态. 发现了一些新的γ跃迁, 经过γ-γ符合分析, 建立了新的能级纲图. 利用系统学比较对新建立的¹⁵⁵Tm能级进行了讨论.