有机硼交联HPG压裂液超低温破胶剂室内研究

对埋藏浅,油层温度低的油藏进行压裂改造,需解决压裂液低温破胶水化的问题。采用活化剂来提高过硫酸铵(APS),酶,胶囊破胶剂的低温破胶能力。通过对有机硼交联的羟丙基瓜胶(HPG)压裂液低温下破胶后粘度损失率的测定,筛选出用于50℃下的APS/活化剂破胶系统及胶囊破胶剂。结果表明:在APS/活化剂破胶系统的作用下,采用有机硼作交联剂的HPG压裂液在较低温度条件下能彻底破胶水化。     

资产专用性对确权后农地流转的影响

农地确权后,农户对农地转出多持中立或否定的态度,这与产权明晰促进交易的产权理论大相径庭。文章探讨了资产专用性对确权后农地流转的作用机理,并运用吉林省9市1444个农户数据对其进行实证分析。结果表明：农地确权后,土地资产、农业资产、地理位置以及人力资本等专用性抑制农户转出农地,农业资产和人力资本专用性抑制农户提高农地租金,而社会资本专用性则分别存在促进作用;农业资产、地理位置以及人力资本等专用性抑制农户更长时间转出农地;农业资产专用性对转出农地须要签订合约具有抑制作用,而地理位置专用性则存在促进作用。     

A search of maximum generalized resolution quaternary-code designs via integer linear programming

Quaternary-code (QC) designs, an attractive class of nonregular fractional factorial designs, have received much attention due to their theoretical elegance and practical applicability. Some recent works of QC designs revealed their good properties over their regular counterparts under commonly used criteria. We develop an optimization tool that can maximize the generalized resolution of a QC design of a given size. The problem can be recast as an integer linear programming (ILP) problem through a linear simplification that combines the \(k\)- and \(a\)-equations, even though the generalized resolution does not linearly depend on the aliasing indexes. The ILP surprisingly improves a class of \((1/16)\)th-fraction QC designs with higher generalized resolutions. It also applies to obtain some \((1/64)\)th-fraction QC designs with maximum generalized resolutions, and these QC designs generally have higher generalized resolutions than the regular designs of the same size.     

试析鲜卑山时代鲜卑部落的族群结构

史书记载的 “鲜卑山”共有五处,通过对比分析可以发现,这五处“鲜卑山”实际上指的是三座山,即鲜卑的发源地、位于大兴安岭南段的“大鲜卑山”,朝阳附近、混有乌桓、匈奴部落的慕容鲜卑部落联盟聚居地“鲜卑山”和敦煌附近、以鲜卑为主体,包含乌桓、匈奴及氐、羌部落的吐谷浑部落联盟聚居地“鲜卑山”,这三座山不仅是鲜卑族兴起和发展阶段的展示,更是鲜卑诸政权的摇篮,对我国古代历史的走向有着重大影响。     

Diagnostics in elliptical regression models with stochastic restrictions applied to econometrics

We propose an influence diagnostic methodology for linear regression models with stochastic restrictions and errors following elliptically contoured distributions. We study how a perturbation may impact on the mixed estimation procedure of parameters in the model. Normal curvatures and slopes for assessing influence under usual schemes are derived, including perturbations of case-weight, response variable, and explanatory variable. Simulations are conducted to evaluate the performance of the proposed methodology. An example with real-world economy data is presented as an illustration.     

Goodness-of-fit tests of generalized linear mixed models for repeated ordinal responses

Categorical longitudinal data are frequently applied in a variety of fields, and are commonly fitted by generalized linear mixed models (GLMMs) and generalized estimating equations models. The cumulative logit is one of the useful link functions to deal with the problem involving repeated ordinal responses. To check the adequacy of the GLMMs with cumulative logit link function, two goodness-of-fit tests constructed by the unweighted sum of squared model residuals using numerical integration and bootstrap resampling technique are proposed. The empirical type I error rates and powers of the proposed tests are examined by simulation studies. The ordinal longitudinal studies are utilized to illustrate the application of the two proposed tests.     

新时代社会主义意识形态的功能提升研究

意识形态功能是意识形态基础研究的核心问题,从意识形态功能提升视角切入是推进我国社会主义意识形态建设的新视阈。在意识形态功能的研究中,抛开时代背景和具体实践谈功能,极易出现意识形态功能研究的“虚化”,形成对意识形态功能的空洞认识。在新时代的历史方位下,结合习近平新时代中国特色社会主义思想论证社会主义意识形态在政治、经济、文化、社会和外交领域的相关功能,以期在市场化、“微时代”、全球化的大环境下通过引领社会主义市场经济改革方向、净化网络空间以及争夺国际话语权等途径,真正实现社会主义意识形态功能的全面提升。     

电动空调涡旋压缩机型线优化

选取我国三大经济区2001—2017年的数据,运用面板数据模型分析了政府财政、金融市场及其相互作用对区域自主创新能力提升的影响,结果表明:政府财政对自主创新能力的提升作用较金融市场更为显著,但三大经济区存在差异;就全国总体而言,金融支持效率指标在是否存在政府中介的情况下均不显著,金融市场对自主创新的支持效率还很低下;误差修正模型表明区域自主创新能力提升还受自身前期自主创新能力水平影响;人力资本的投入对区域自主创新能力的提升起到至关重要的作用。     

城市化进程中少数民族流动人口就业现状、存在问题及其对策分析

城市化进程的加快,必然导致人口流动,更多少数民族人口流动到城市就业.作者对成都市少数民族流动人口就业现状、特征进行了调查,分析了少数民族流动人口就业存在的问题,并就与之相关的对策进行了探讨.     

农民工生存现状与和谐城市构建

城市化进程中的民工潮是中国由传统农业社会向现代工业社会过渡的大势所趋。随着城镇二三产业发展加快,农民工进入城市的人数逐渐增多,已经事实上成为城市建设者和生存者的一员（社会阶层）。但在城市GDP大幅增长的同时,农民工与城镇居民在现实生活方面的差距却越来越大,已经严重地影响到社会的稳定发展。当前,农民工的生存、发展同题应当引起各级政府部门的高度重视。只有真正做到农民工在政治权益、经济待遇上的公平、公正,才能保证社会的和谐发展。