新疆入境外国游客客源市场分析基于亲景度、竞争态及SSM

分析新疆入境外国游客客源市场,明确市场的发展现状、存在问题和未来趋势,更有利于旅游业快速发展。运用亲景度、竞争态和SSM方法,借助有关统计数据,从不同角度探讨新疆入境外国游客客源市场的研究结果表明:各客源国入境外国游客对新疆的整体亲景度稳中下降;市场竞争态整体良好,但某些客源国市场增长率明显缓慢;市场竞争力在全国较强,但市场结构欠佳。针对各客源市场的不同,提出了相应的发展对策。     

家庭承包经营体制的创新与土地的适度规模经营

土地集约化、规模化经营是我国农业生产发展的必然趋势.随着生产力的提高和宏观环境的变化,土地家庭承包制的缺陷也开始显现.所以,在国家政策法律支持下进行家庭承包经营体制的创新发展,采取不同的模式加速土地的集中和规模化经营,是提高我国农业劳动生产力,增加农民收入的主要方向.     

固体阻垢剂ZGJ-1的室内研制

针对油田结垢特点和液体阻垢剂存在间歇注入、加药不均匀、药效短、消耗大和效果不稳定等缺点，室内合成了母体阻垢剂，研制筛选出了增效剂、粘合剂的配方，固体阻垢剂ZGJ-1的成型方法和工艺，建立了固体阻垢剂平均溶解速率及溶出率的评价方法，80℃时静、动态平均溶解速率分别为0.130 8、0.159 2g/d·cm²，在加药量为10mg/L时对油田污水的阻垢率达到98.9%。现已在胜利油田推广应用。     

Initial Validation of the Open Adoption Scale: Measuring the Influence of Adoption Myths on Attitudes Toward Open Adoption

All adoptions, including those facilitated by public agencies, should be evaluated for openness. Although there are no national figures related to openness in public welfare, there are indications that it is not considered in all cases. Adoption myths may be one of the reasons that adoption workers do not always assess a family's ability to maintain a more open adoption arrangement. The following study is the initial validation of a multidimensional psychometric instrument developed to measure myths as they relate to open adoption. Based on a sample of 547 university students, the results indicate very good reliability and acceptable factorial and construct validity. The instrument was designed as a training and research tool to inform child welfare personnel and policy makers of the influence of adoption-related myths on child welfare adoption practice.     

基于绿色规模效益的中周连锁零售业并购

中国连锁零售业虽然销售规模和企业规模不断扩大。但与国外连锁零售业相比，还存在市场集中度低、规模经济不明显等问题。合理扩大连锁零售企业的规模既是完善自身发展、获得协同效应的有效手段，也是应对外资企业冲击的迫切需要。在分析中国连锁零售业现状和并购效应以及评论中国连锁零售企业并购历程的基础上，提出并购是获取规模经济的有效途径，并从政府、社会、企业三方面提出完善中国连锁零售业并购的措施。     

Simultaneous bootstrap confidence bands in regression

We suggest pivotal methods for constructing simultaneous bootstrap confidence bands in regression. Most attention is given to the problem of simple linear regression, but our techniques admit trivial extension to other cases, including polynomial regression. The advantages of our bootstrap approach are twofold. Firstly, the bootstrap allows a very general distribution for the errors, and secondly, it admits a wide variety of shapes for the confidence band. In our technique the shape of each envelope of the band is determined by a general template, chosen by the experimenter, and bootstrap methods are used to select the scale of the template.     

套管抗挤强度分析及计算

为提高套管挤毁压力预测精度，应用统计方法对213根套管全尺寸挤毁试验数据进行了方差分析，研究了外径不圆度、壁厚不均度、残余应力等因素对套管抗挤强度的影响。分析结果表明，径厚比、屈服强度是套管抗挤强度的主要因素，不圆度、壁厚不均度、残余应力等因素对套管抗挤强度的影响呈随机性分布。利用有限元方法对外径不圆度、壁厚不均度和残余应力的不同位置组合进行了模拟分析。结果表明，数值相同的外径不圆度、壁厚不均度及平均残余应力组合不同时，套管的挤毁压力相差很大。最后提出了一个套管抗挤强度计算公式，计算简单，精度可满足工程要求。     

中国企业出口与生产率关系实证研究——对制造业企业自我选择效应和出口中学效应的分析

运用2005—2008年中国14个制造业企业面板数据,分析企业出口的自我选择效应和出口中学效应,结果表明:中国制造业企业出口与生产率的关系违背异质性企业贸易模型,自我选择效应不显著,并且存在"生产率悖论";出口中学效应也不显著。虽然出口企业的生产率与出口规模正相关,但在控制其他影响出口规模的变量后,生产率与出口规模则呈现负相关;在控制其他影响生产率的变量后,出口规模与生产率同样也会呈现负相关。中国企业出口的自我选择效应不显著的原因在于其加工贸易等现实条件与经典理论假设的背离;而中国企业出口中学效应不明显的重要原因则在于其自我选择效应的不显著和规模报酬递减。     

Estimating with percentile grouped and truncated date from a scale parameter distribution

Data which is grouped and truncated is considered. We are given numbers n₁<…<n_k=n and we observe X_ni ),i=1,…k, and the tottal number of observations available (N> n_k is unknown. If the underlying distribution has one unknown parameter θ which enters as a scale parameter, we examine the form of the equations for both conditional, unconditional and modified maximum likelihood estimators of θ and N and examine when these estimators will be finite, and unique. We also develop expressions for asymptotic bias and search for modified estimators which minimize the maximum asymptotic bias. These results are specialized tG the zxponential distribution. Methods of computing the solutions to the likelihood equatims are also discussed.     

Combined estimate of a location parameter

In this paper, we revisit the problem of combining estimates of location considered by Cohen (1976). Our results unify and strengthen the results of Cohen (1976), Bhattacharya (1981) and Akai (1982).