The political and institutional determinants of fiscal adjustments and expansions: Evidence for a large set of countries

Using annual data for 60 countries over 1980–2014, we study the drivers of fiscal adjustments, expansions, and their duration. In contrast to most previous studies, the identification of these fiscal events relies on breaks in their data generating process. Our findings suggest that a few political and institutional variables play a role in determining the occurrence and the duration of fiscal adjustments and expansions. The results also highlight the importance of analyzing the likelihood of fiscal events together with their persistence. Factors that do not affect the occurrence of fiscal adjustments or expansions may influence their persistence once initiated.     

高性能混凝土配合比设计的正交试验探讨

本试验用正交试验方法探讨混凝土基本力学性能的影响规律，以确定最佳配合比，为今后设计高性能混凝土配合比提供基本依据。     

超微粉碎山楂粉营养面包制作工艺研究

探讨以山楂超微粉为原料生产面包的制作工艺,通过正交试验确定了山楂超微粉面包的最佳配方:300目山楂粉添加量为3%、食盐为0.6%、白砂糖为18%、面包改良剂为0.5%,研制的面包不仅风味口感俱佳,且营养价值较高。     

快餐面条抗粘剂配方的应用研究

面条美味可口,深受老百姓的喜爱。随着生活节奏加快,快餐面条,前景光明。但面条蒸煮后极易黏连,不易分散,影响外观和食用口感,进而影响快餐面条的规模化和市场化。针对这一点,实验选取三种天然食品抗粘剂,通过浸泡,增强面条的疏松性。并在单因素的基础上进行复配和正交实验,从而得到效果较好的抗粘剂配方,应用于面条的抗粘。     

The analysis of ranked data in blocked factorial experiments

A non-parametric method for the analysis of blocked factorial experiments, based on ranking within blocks, is proposed and shown to be equivalent to partitioning Friedman's test statistic into a set of contrasts reflecting polynomial components of the main effects and interaction. A slightly modified version of the procedure is suggested to partially overcome the problem of loss of power to detect one component when the model includes other components. This alternative procedure is shown to be equivalent to applying a standard normal theory analysis of variance to the ranks. The null distributions and power comparisons are investigated using simulation methods, and it is shown that the non-parametric methods are almost as powerful as the analysis of variance. Received: February 1999     

一种电力系统在线动态安全评价模式识别法研究

文章讨论了一种应用模式识别进行电力系统在线动态安全评价的方法,利用发电机摇摆过程中转子间的最大相对摇摆角与故障前各发电机输出的有功功率之间存在的连续映射关系,用高阶多项式作为判别函数,来逼近其映射.多项式的系数用最小二乘法拟合确定,结果显示较一般方法学习简单,速度较快,更适合多个预想事故情况下共用.     

基于正交扩展的MB-OFDM系统性能分析

针对多带正交频分复用(MB-OFDM)通信系统存在窄带干扰的问题,提出了一种基于高阶旋转扩展矩阵的多带OFDM系统.同时用误差权重分布方法分析各种角度的高阶旋转扩展矩阵及其它正交扩展矩的分集度,并在实验仿真中比较了各种扩展矩阵对MB-OFDM系统性能的影响,结果表明各种角度(π/2除外)的高阶旋转扩展矩阵进一步提高超宽带系统抗窄带干扰的能力.     

Applications of Eigenfunction Expansions in Continuous-Time Finance

We provide exact solutions for two closely related valuation problems in continuous-time finance. The first problem is to value generalized European-style options on stocks that pay dividends at a constant dollar rate. The second problem is to find the yield curve associated with the economy of R. C. Merton's "An Asymptotic Theory of Growth Under Uncertainty." In Merton's economic growth model, the interest rate process has a volatility linear in the rate level and a linear/quadratic drift. Both problems are solved by an eigenfunction expansion technique. The main technical difficulty is handling the problem of payoff functions that are not square-integrable with respect to the natural weight function of the models.     

真空低温烹饪甜皮鸭工艺优化研究

为推动真空低温烹饪技术在甜皮鸭生产工艺中的应用,本研究以传统甜皮鸭生产工艺为基础,结合现代低温烹饪技术,通过单因素实验与正交实验对其工艺进行优化。最终确定低温烹饪甜皮鸭最佳工艺参数:慢煮温度为75℃,慢煮时间为50 min,油炸温度为150℃,油炸时间为1.0 min。本研究为低温烹饪甜皮鸭生产提供理论参考,同时也为低温烹饪技术在其他产品生产中的应用提供借鉴。     

QAM-OFDM雷达通信共享信号长时间相参积累算法

QAM-OFDM(Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing)雷达通信共享信号因携带随机通信信息，其脉压旁瓣的随机性较大，类似噪声的影响。针对该问题，采用基于Keystone变换的长时间相参积累算法抑制其旁瓣。在共享信号模型的基础上，分析了其脉压旁瓣受随机通信信息的影响以及采用长时间相参积累抑制其旁瓣的可行性，然后采用Keystone变换校正其长时间相参积累产生的距离单元走动，并进行多普勒模糊补偿处理。理论分析和仿真结果表明，该方法使得回波能量积累集中，能有效实现共享信号脉压旁瓣的抑制。