广义经济学

回顾了火用经济学的历史及发展 ,通过对热力学系统与经济学系统的相似性比较 ,将广义火用的概念引入到经济学系统中来 ,并由此建立资本品质的概念 ,进而建立起以核算资本火用参量为基准的新型经济学理论。对广义火用经济学的若干状态参量的建立及定义作了初步探讨。     

一类新平均函数的单调性

本文将对数平均推广为单参数平均函数通过讨论Z（X）的单调性,改进了基本不等式,推广了近年来的一些不等式,并揭示了这些不等式之间的关系。     

Linearly admissible estimators of the common mean parameter under balanced loss function

Admissibility of linear estimators of the common mean parameter is investigated in the context of a linear model under balanced loss function. Sufficient and necessary conditions for linear estimators to be admissible in classes of homogeneous and non homogeneous linear estimators are obtained, respectively.     

基于二元Logistic模型的农村劳动力转移培训需求意愿研究

通过对农村劳动力转移培训需求进行二元Logistic模型检验,发现女性、已婚、群众、转移时间长、目前工作状况不好,以及能对未来家庭生活有所改善等因素可以促进农村劳动力进行转移培训。对此,政府应加大对农村劳动力的培训力度,切实提高培训质量,推行培训与职业资格认证制度的结合。     

Long-range dependence analysis of Internet traffic

Long-range-dependent time series are endemic in the statistical analysis of Internet traffic. The Hurst parameter provides a good summary of important self-similar scaling properties. We compare a number of different Hurst parameter estimation methods and some important variations. This is done in the context of a wide range of simulated, laboratory-generated, and real data sets. Important differences between the methods are highlighted. Deep insights are revealed on how well the laboratory data mimic the real data. Non-stationarities, which are local in time, are seen to be central issues and lead to both conceptual and practical recommendations.     

Semi-parametric tail inference through probability-weighted moments

In this paper, for heavy-tailed models, and working with the sample of the k largest observations, we present probability weighted moments (PWM) estimators for the first order tail parameters. Under regular variation conditions on the right-tail of the underlying distribution function F we prove the consistency and asymptotic normality of these estimators. Their performance, for finite sample sizes, is illustrated through a small-scale Monte Carlo simulation.     

Lower Risk Bounds and Properties of Confidence Sets for Ill‐Posed Estimation Problems with Applications to Spectral Density and Persistence Estimation,Unit Roots,and Estimation of Long Memory Parameters

Important estimation problems in econometrics like estimating the value of a spectral density at frequency zero, which appears in the econometrics literature in the guises of heteroskedasticity and autocorrelation consistent variance estimation and long run variance estimation, are shown to be “ill‐posed” estimation problems. A prototypical result obtained in the paper is that the minimax risk for estimating the value of the spectral density at frequency zero is infinite regardless of sample size, and that confidence sets are close to being uninformative. In this result the maximum risk is over commonly used specifications for the set of feasible data generating processes. The consequences for inference on unit roots and cointegration are discussed. Similar results for persistence estimation and estimation of the long memory parameter are given. All these results are obtained as special cases of a more general theory developed for abstract estimation problems, which readily also allows for the treatment of other ill‐posed estimation problems such as, e.g., nonparametric regression or density estimation.     

小型光泵腔式NH3分子远红外激光器工作参数优化的实验研究

实验上采用金属网栅耦合的小型腔式NH3 分子远红外激光器 ,用TEA -CO2 激光器的 1 0R(8)和 9R(1 6)谱线作泵浦 ,获得了 2 81 μm和 90 .4μm的远红外激光 ,并对该激光器工作参数的优化进行了系统的实验研究     

基于MasterCAM的模具数控加工过程分析与应用

模具零件因其复杂的空间形面和形面特征而广泛采用数控加工方式。以常见的凹槽模具为例,基于MasterCAM对其数控加工过程进行了分析和参数设定。运用不同铣削方法完成了粗、精加工程序的编制与仿真,分析比较了典型的粗、精加工组合方式的加工质量和加工时间,确定了合理、高效的铣削方法。旨在探索一种优质、高效的数控加工方法,保汪加工精度和质量、缩短产品生产周期、降低加工成本。     

Q235钢静载拉伸磁记忆检测试验

为了研究磁记忆信号和应力之间的关系,采用磁记忆方法检测单向静载拉伸后Q235钢板表面磁场强度法向分 量Hp(y),并设计了更方便检测的拉伸试样。结果表明Q235试件断裂前磁场法向分量检测曲线为斜直线,具有唯一的 极性翻转点。同时还发现Q235材料处在弹性阶段时磁参数m值变化较慢,在塑性变形阶段时磁参数m值变化较快。