加权最小二乘估计与线性无偏最小方差估计的比较

在已知的线性模型中,考虑加权最小二乘估计与线性无偏最小方差估计的结果的差异。发现在两种条件下,加权最小二乘估计与线性无偏最小方差估计的结果趋于一致。     

线性模型M估计大样本理论的进展与问题

文章简要介绍了线性模型Ｍ估计（包括ＬＳ和Ｌ１估计）大样本理论研究状况,提出了一些有待解决的重要问题。     

关于生产函数中的生产要素的选择问题

关于生产函数中的生产要素的选择问题凌小梅（广西区委党校５３００２３）１传统的生产要素选择的缺陷人们通常把生产投入的生产要素分为两种：劳动和资本，分别用Ｌ及Ｋ来表示，再考虑技术进步水平Ａｔ的作用，则生产函数可表示为Ｙｔ＝ｆ（Ａｔ，Ｌ，Ｋ），Ｙｔ表示产...     

回归系数一类线性估计的小样本性质

提出了线性模型中回归系数的一类线性估计.在均方误差矩阵(MSEM)准则和Pitman Closeness(PC)准则下,研究了这类线性估计相对于最小二乘(LS)估计的优良性.最后,讨论了当设计阵为非列满秩时,回归系数的可估函数的一类线性估计的优良性.     

我国职工工资收入分布函数的模拟与估计

本文在某些经验假设下采用随机的方法生成了我国职工工资收数据,利用模拟数据讨论了我国职工工资收入的分布,并对我国职工工资收入分布的密度函数进行了估计。     

初中数学线性函数教学方法的探究

为了使学生能够更好地欣赏并且学习变化与对应问题的思想和方法,初中线性代数函数教学则是一种重要的教学模型,它不仅能够让学生能够更好地适应进一步的学习变化与对应,而且能够使学生感受到其中的理性精神和数学技巧。基于此,本文对初中数学线性函数教学方法进行了探讨。     

用卡尔曼滤波模型对我国出口函数的估计与分析

用卡尔曼滤波模型对我国出口函数的估计与分析张桂莲史永东（吉林大学商学院１３００２３）（东北财经大学理财工程学研究所）近些年来随着我国经济体制改革的顺利推进，整个国民经济的持续增长，外商投资企业在全国进出口贸易中份额的扩大，使我国的对外经济贸易特别是...     

我国工业企业技术效率的比较分析——应用随机前沿生产函数进行的比较

采用随机前沿生产函数对不同所有制企业的技术效率水平进行了比较评价。通过Frontier Version4．1软件,将企业间技术效率的差异用可比的方式表示,并用技术效率的指标作为被解释变量,企业的所有制、企业的特质指标作为解释变量估计模型的各个参数,进一步找出技术效率差异产生的原因,提出了提高企业技术效率水平的建议。     

SCI与科研成果评价探讨

近年来,SCI评价标准作为评价科研成果的一种标准,引起了学术界的广泛关注。本文从分析SCI评价标准的应用情况入手,探讨SCI自身的局限性、过度强调SCI评价标准的危害性以及如何合理地利用SCI评价标准。     

国内外科研绩效评价方法比较

在对国内外科研绩效评价定性与定量方法比较的基础上,对国内科研绩效评价进行了思考并提出自己的建议。     

Microfluidic generation of droplet interface bilayer networks incorporating real-time size sorting in linear and non-linear configurations

In this study, a novel droplet based microfluidic method for the generation of different sized droplet interface bilayers is reported. A microfluidic platform was designed, which allows the generation and packing of picoliter lipid coated water droplets. Droplets were generated by hydrodynamic focusing coupled with selective transport along grooves according to their size. A trapping structure at the end of the groove and a fine control of the flow pressures allowed for the droplets to be successfully trapped and aligned on demand. This technology facilitates the fine control of droplet size production as well as the generation of extended networks from a variety of lipids including 1,2-diphytanoyl-sn-glycero-3-phosphocholine and 1,2-dioleoyl-sn-glycero-3-phosphocholine in linear and non-linear configurations, which is vital to the application of Droplet Interface Bilayers to biological network construction on-chip.     

清洁生产审核的职能定位探讨

明确清洁生产审核工作的职能定位,是清洁生产审核工作存在和发展的基础,也是实施清洁生产战略的具体工作指针。本文在论述清洁生产审核的职能定位的必要性的同时,建设性地提出了清洁生产审核职能定位的具体涵义和内容,从而为清洁生产审核工作的深入开展和今后的发展提供理论上的借鉴。     

基于非线性映照遗传算法的空气质量评价模型

本文运用MATLAB7.0的遗传算法工具箱实现了环境质量高维数据到二维直观空间的非线性映照,通过实例证明,该空气质量评价模型可与一些现行综合评价方法相媲美,且更直观、简捷。     

A linear optimization approach to the combined production planning model

Two fundamental processes usually arise in the production planning of many industries. The first one consists of deciding how many final products of each type have to be produced in each period of a planning horizon, the well-known lot sizing problem. The other process consists of cutting raw materials in stock in order to produce smaller parts used in the assembly of final products, the well-studied cutting stock problem. In this paper the decision variables of these two problems are dependent of each other in order to obtain a global optimum solution. Setups that are typically present in lot sizing problems are relaxed together with integer frequencies of cutting patterns in the cutting problem. Therefore, a large scale linear optimizations problem arises, which is exactly solved by a column generated technique. It is worth noting that this new combined problem still takes the trade-off between storage costs (for final products and the parts) and trim losses (in the cutting process). We present some sets of computational tests, analyzed over three different scenarios. These results show that, by combining the problems and using an exact method, it is possible to obtain significant gains when compared to the usual industrial practice, which solve them in sequence.     

关于R＆D产出的国际比较与评价研究

首先对R＆D产出进行了界定，即确定了可以进行国际比较的R＆D产出含义和构成。其次，研究了如何对论文、专利和贸易额数据进行无量纲化处理，确定了不同比较内容在综合评价中的权重，以及如何在此基础上进行综合评价。最后，根据文章所提出的方法论，对美国、英国、日本、法国、德国、意大利、加拿大和中国的R＆D产出进行了国际比较。     

浅谈中西戏剧戏曲艺术比较

世界愈来愈呈现出东西方融合的趋势,未来的新文化必定是东西方文化精华结合的产物。因此,将中西戏剧文化做以比较,寻求二者的共性和个性,探索其蕴含的美学价值,有助于突破中国戏剧的自身局限,进行自我完善、多样化发展。     

Current concepts of thyroid function and laboratory evaluation

The role of triodothyronine (T₃ in regulating thyroid function is paramount in that at cellular level it interacts with receptors in the nucleus and thereby modulates gene expression. The multiple steps in the processing of lodide by the thyroid gland is under the influence of the thyroid stimulating hormone (TSH). In terms of laboratory evaluation of thyroid function the primary test is TSH. To discriminate between hypothalamic and pitutary dysfunction, the thyroid releasing hormone (TRH) stimulation test is useful. Currently used 2-site Immunometric procedures that employ mouse monoclonal antibodies can be subject to Interference by heterophlle antibodies in patient's serum. Drugs and other extraneous substances can influence the results obtained in some thyroid function tests. Thyroid dysfunction could also be due to autoimmune disease. The limitations of the usefulness of thyroid function tests in non-thyroidal illness should be kept in perspective. In conclusion, the proper interpretation of results of thyroid function tests depends on the sound understanding of concepts of thyroid function and variables affecting laboratory testing.     

学术期刊对科研的评价作用

目前有关学术期刊用于评价科研成果存在许多争议,这是科研管理工作滞后的表现。从科技期刊的性质、期刊质量与科研论文的关系、论文发表过程、论文的后续影响等角度,对学术期刊的科研评价作用进行的分析说明,科技期刊的评价作用具有现实的积极意义。按照分类可比性原则,在科学合理的期刊分级和论文延续评价指标体系下,学术期刊可以成为学术论文合理、客观的评价工具。