径向水平井技术研究与应用

径向水平井技术可为低渗透、稠油、老油田复产和边际油气提供一种经济高效的开采途径。介绍了美国RDS(Radial Drilling Services)径向水平井技术的原理、工艺、设备、施工步骤及现场应用,分析了RDS径向水平井技术在低渗透井、低产井、稠油井和二次开发井中的应用效果。     

所得税申报中资产时间性差异的调整方法比较

在所得税申报中,资产时间性差异的纳税调整要涉及几个纳税年度,并且一个正常生产经营企业的资产往往处在动态过程中。每年有新增资产,也有出售、报废、到期的资产,要准确无误地对其进行纳税调整,是所得税申报中的一个常见问题也是难点问题。文章通过对所得税申报中资产时间性差异调整的两种方法的比较,确定一种较为简便可行的方法。     

Real Options, (Dis)Investment Decision-Making and Accounting Measures of Performance

This paper suggests that a residual income-type measure of performance can be designed which supports optimal investment and disinvestment decision-making in a real options framework involving the options to wait before investing and to abandon. The measure has a number of advantages and disadvantages. Nonetheless, the balance of advantage versus disadvantage for the proposed measure must be set against the inadequacies of other competing measures of performance and associated organisational designs. Even if the measure of performance suggested is not regarded as practically useful, it has another general advantage – it can be used as a benchmark against which to evaluate other performance measures with regard to their support of optimal investment and disinvestment decision-making in a real options framework.     

The effect of takeovers on the fundamental value of acquirers

This paper develops a new methodology to examine the financial impact of acquisitions, designed to address whether takeovers yield a positive net present value for the acquiring company. Specifically, we employ the residual income valuation method to compare the fundamental value of the acquiring company before acquisition with the fundamental value after acquisition.We apply this methodology to 303 UK acquisitions completed during 1985–1996, and compare the results with the effects of takeover on profitability and short‐ and long‐run share returns. We find that the impact of acquisition on fundamental value is slightly negative but statistically insignificant. This result differs from the effect of takeover on profitability, which is significantly positive, and the effect of takeover on share returns, which is significantly negative.     

剩余电流保护器的应用分析

该文对剩余电流保护器在选型和安装等方面,进行正确与错误做法的对比分析,提出应用中几点注意事项。     

The residual market factor,the APT,and mean-variance efficiency

The rapidly increasing volume of both published and unpublished work on the arbitrage pricing theory (APT) of Ross (1976) has given rise to a number of misunderstandings at the interface of theoretical and econometric work. In this article we extend the theoretical structure of our previous work (McElroy and Burmeister, 1985, 1988; Burmeister and McElroy, 1987, 1988) to provide a broad yet rigorous framework both for econometric estimation and for better economic interpretation of new empirical results. We begin with the case where allK factors are observed, and then present the second case ofK−1≡J observed APT factors and one unobserved factor, theresidual market factor introduced in McElroy and Burmeister (1985). The economic interpretations for equivalent specifications of this model are discussed, and we enumerate several immediate payoffs to these specifications. The main new results are concerned with the sometimes intricate relationships among APT models withK factors and APT models withK factors that are constrained to satisfy mean-variance efficiency restrictions. These results are not only of theoretical interest, but more importantly they provide the basis for econometric estimation and testing of nested hypotheses. These econometric issues are discussed in detail.     

Covariance formulas via marginal martingw

Prenctice and Cai recently introduced and studied the function C defined as the covariance function of the two marginal counting process martingales of a pair of dependent survival times (T₁, T₂ ). They show that the function C together with the marginal distributions determines the joint survival function F of (T₁, T₂ ). In this note we show how the key characterizing equation of Prentice and Cai yields a formula for the covariance of T₁ and T₂ in termsof the marginal mean residual life functions and C. The resulting formula generalizes a formula for the variance of a one-dimensional random variable Tdueto Pyke (1965). We also explore several generalizations of the covariance formula, and obtain a valid k-dimensional version of the Prentice and Cai formula.     

基于灰色残差模型的中国税收收入预测

税收是国家财政收入的重要来源,准确的税收预测结果对于制定各项经济政策具有非常重要的意义。为提高中国税收收入的预测精度,适应资源配置、收入再分配和宏观经济调控的需求,在传统灰色预测技术的基础上,建立了残差灰色预测模型,并通过实例分析验证了该模型的实用性和精确性。     

建设用地扩张对经济持续增长能力影响

首先从索罗增长模型出发分析表示经济持续增长能力的关键指标,其次通过1998—2008年中国省际面板数据回归分析建设用地规模对相关关键指标影响,以推出建设用地扩张对经济持续增长能力影响。结果表明:①索罗增长模型中单位资本产出水平是考量经济持续增长能力的重要指标,其决定经济增长率与增长空间;②面板计量结果中1998—2008年间中国建设用地数量对单位资本产出水平有显著负影响,说明期间建设用地扩张减小经济增长率与增长空间。研究认为,在经济转型期中国应严控建设用地扩张,以减小经济增长对土地资源依赖程度,进而促进技术进步,倒逼经济增长方式转变。     

Some Properties of Past Entropy and their Applications

In the context of information theory, measure of uncertainty in past lifetime distribution has been proposed by Di Crescenzo and Longobardi (J Appl Probab 39:434–440, 2002). In this paper, we study some ordering and aging properties in terms of past entropy (based on past lifetime) and develop some characterization results. Some discrete distribution results are also addressed here.