Separating points of measures on effect algebras

We prove the existence of separating points for every countable family of nonatomic σ-additive modular measures on a σ-complete lattice ordered effect algebra.      

取样管型流分相式气液两相流体流量计

提出了用取样管来组成一种分流分相式气液两相流体流量计,通过取样管从被测两相流中成比例地分流出一部分气液混合物,然后应用-小型分离器将其分离成单相气体和液体,并用单相流量计分别测量它们的流量,最后根据测量值计算被测两相流体的各相总流量.文中给出了这种两相流体流量计的组成原理,分流系数特性及实验结果.研究结果表明,取样管的端口形状对分流系数的特性影响较大,其中S型端口的效果较理想,能够在较宽的测量范围内保持分流系数的稳定.     

A continuous decomposition of the Menger curve into pseudo-arcs

It is proved that the Menger universal curve admits a continuous decomposition into pseudo-arcs with the quotient space homeomorphic to .

     

非对称信息证券交易的跨期动态博弈均衡解析

揭示了不对称信息条件下证券市场均衡的基本特征.Grossman和Stiglitz模型依据不知情交易者的弱理性,解析了证券交易的静态均衡状态.O'Hara模型增强了不知情交易者的理性,强调了市场均衡时的风险定价,但其命题的成立条件是相互矛盾的.认为不知情交易者信息收集和处理能力的提高会使决策更为理性,证券市场的均衡本质上是交易者的动态博弈均衡.依此思路,运用不完美信息的跨期动态博弈模型解析了非对称信息条件下证券交易者的精炼贝叶斯纳什均衡.结论显示出,市场失效的主要原因是交易者之间的信息分析能力不平衡,而不是信息不对称;市场流动性的决定因素不是信息不对称风险而是知情交易者与不知情交易者所研判的无风险收益率的差别.     

浙江省海岛土地资源开发利用探讨

浙江省是全国岛屿最多的省份，海岛为全省实现“海洋经济大省”起着重要作用。本文在分析浙江省海岛土地利用现状及其特点的基础上，指出开发利用中存在的主要问题，提出了合理开发利用的战略对策。     

液体表面张力系数测定实验的几点分析

用拉脱法测定水的表面张力系数实验中，用焦利氏秤测定（Ｆ—Ｗ）时，确定焦利氏秤标尺读数Ｌ１、Ｌ２的位置有两种方法。本文旨在详细分析这两种方法隐含的实验条件和对实验结果的影响．并进行比较，得出结论。     

Explicit constructions of separating hash families from algebraic curves over finite fields

Let X be a set of order n and Y be a set of order m. An (n,m,{w ₁, w ₂})-separating hash family is a set of N functions from X to Y such that for any with , |X ₁| = w ₁ and |X ₂| = w ₂, there exists an element such that . In this paper, we provide explicit constructions of separating hash families using algebraic curves over finite fields. In particular, applying the Garcia–Stichtenoth curves, we obtain an infinite class of explicitly constructed (n,m,{w ₁,w ₂})–separating hash families with for fixed m, w ₁, and w ₂. Similar results for strong separating hash families are also obtained. As consequences of our main results, we present explicit constructions of infinite classes of frameproof codes, secure frameproof codes and identifiable parent property codes with length where n is the size of the codes. In fact, all the above explicit constructions of hash families and codes provide the best asymptotic behavior achieving the bound , which substantially improve the results in [ 8, 15, 17] give an answer to the fifth open problem presented in [11].     

Decomposing planar cubic graphs

The 3‐Decomposition Conjecture states that every connected cubic graph can be decomposed into a spanning tree, a 2‐regular subgraph and a matching. We show that this conjecture holds for the class of connected plane cubic graphs.     

Vulnerable Derivatives and Good Deal Bounds: A Structural Model

Abstract

We price vulnerable derivatives – i.e. derivatives where the counterparty may default. These are basically the derivatives traded on the over-the-counter (OTC) markets. Default is modelled in a structural framework. The technique employed for pricing is good deal bounds (GDBs). The method imposes a new restriction in the arbitrage free model by setting upper bounds on the Sharpe ratios (SRs) of the assets. The potential prices that are eliminated represent unreasonably good deals. The constraint on the SR translates into a constraint on the stochastic discount factor. Thus, tight pricing bounds can be obtained. We provide a link between the objective probability measure and the range of potential risk-neutral measures, which has an intuitive economic meaning. We also provide tight pricing bounds for European calls and show how to extend the call formula to pricing other financial products in a consistent way. Finally, we numerically analyse the behaviour of the good deal pricing bounds.     

基于可控相转变温度热敏高分子的人IgG酶联荧光免疫分析

以温度敏感高分子聚N－异丙基丙烯酰胺－丙烯酰胺[P(NIP-AA)]作为载体,建立了酶联荧光免疫分析人IgG的新方法。AA摩尔含量为8％的高分子P(NIP-AA)其临界溶解温度为37 °C。竞争型免疫测定中,被固定的IgG和标准溶液（或样品）在33 °C均相条件下竞争性地与辣根过氧化物酶标记抗体反应,升高温度分离出高分子免疫复合物,沉淀重新溶解后通过偶联过氧化氢与对羟基苯乙酸的荧光反应进行定量,线性范围为100-1000 ng/mL,检测限为2.0 ng/mL。方法灵敏、快速操作简便,且提高了免疫反应效率。此外,灵敏度与用传统微孔板做载体相似,但测定时间更快（从100-120分钟减少到30分钟）。该法用于测定人血清中IgG的含量,结果满意。