安康市建筑业发展现状、问题与对策分析

作为秦巴山区连片特困地区的陕西省安康市在脱贫攻坚期间的建筑业发展如何,本文通过对安康市统计年鉴近5年建筑业数据的统计分析,总结出安康建筑业的发展现状、建筑业特点、建筑企业特点及存在问题,研究认为安康市建筑业应该加强对建筑业的政策扶持,鼓励企业参与技术创新、大力培养竞争力强的优质企业和BIM技术的应用以促进安康市建筑业创新发展和稳定发展.     

The equivalence of supporting software delegation and sales delegation

This paper considers a duopoly market with horizontally differentiated system goods to examine system owners' behaviors under supporting software delegation, in which owners of system firms use varieties of supporting software, coupled with profit, to evaluate their managers' performance. Supporting software delegation seems to induce managers to act more aggressively in price competition than sales delegation does; however, we prove that if two systems are compatible and the varieties of supporting software are determined by hardware owners' overall expenditure amount on software, then supporting software delegation is equivalent to sales delegation. Owners of system firms induce their managers to act less aggressively in hardware price competition by offering contracts with a negative weight on varieties of supporting software under supporting software delegation. We find that stronger network externalities do not reverse system owners' contracting behaviors under supporting software delegation. Finally, it is worth mentioning that hardware technologies are static in this paper. In other words, dynamic changes such as hardware evolution are not considered in our analysis.     

国内贸易隐含碳转移与损益偏离研究——基于经济内循环视角

文章构建损益偏离指数探讨经济内循环视角下国内贸易中的环境不公平问题.结果表明:经济内循环中经济收益较大的地区集中在京津冀、长三角、山东、湖南、广东等东部沿海地区;相对受损地区集中在山西、内蒙古、河南、黑龙江、吉林及西部等资源密集地区;省际贸易引致隐含碳转移规模差异显著,隐含贸易增加值与隐含碳转移在空间上分离,有逆向转移的特征,印证了"损益偏离"现象;通过进一步的损益偏离分析发现中国省际贸易中普遍存在损益偏离现象,偏离程度以中度和轻微偏离为主;高度偏离关系发生在东部与中部省区之间、东部省区内部及东部与西部省区之间.     

浅谈泵送产品的公告试验检测

论文针对泵送产品公告试验检测的现状,详述了公告试验检测方案中的关键控制点,并就目前检测过程中存在的问题提出了建议。     

信号级协同计算平台架构及应用思考

针对智能化作战对军事电子信息系统计算能力提升的迫切需求，结合云计算的资源虚拟化、大数据的分布式计算等技术，提出了基于嵌入式CPU+ALL（DSP、FPGA、PPC、GPU、AI处理器等）的异构处理的信号级协同计算平台架构，包括弹性、轻量级异构资源虚拟化模型、分布式实时计算框架和智能计算框架等，形成了一套架构统一、资源共用、使用简便的协同计算和智能计算环境。通过战术级无线电认知和智能信号与信息处理两个典型应用场景，探讨了该信号级协同计算平台可能带来的颠覆性效用。     

税费改革对粮食生产的影响研究

税费改革是继家庭承包责任制之后,中国农村最重要的一项改革举措,但这项改革对粮食生产的影响如何,现有文献尚缺乏专门和深入讨论。基于2000-2012年省级面板数据和动态面板的系统GMM方法,本文实证研究了税费改革对稻谷、小麦和玉米作物播种面积和单位面积产量的影响,考察农村税费改革的政策效果。研究发现:2000-2006年实施的税费改革对粮食生产具有显著的推动作用;分阶段研究表明,税费改革第一阶段的政策效果并不显著,税费改革对粮食生产的刺激作用主要体现在改革的第二阶段,且本文的研究结果对于替代性的减税指标具有稳健性;税费改革对粮食生产的推动作用在农业税全面废除的后续年份表现出较强的持续性。另外,总体来看财政支农政策、抗灾能力和化肥使用对粮食生产具有较为显著的正向影响,预期因素和产业结构因素的影响不显著。     

Random Effects Misspecification Can Have Severe Consequences for Random Effects Inference in Linear Mixed Models

There has been considerable and controversial research over the past two decades into how successfully random effects misspecification in mixed models (i.e. assuming normality for the random effects when the true distribution is non‐normal) can be diagnosed and what its impacts are on estimation and inference. However, much of this research has focused on fixed effects inference in generalised linear mixed models. In this article, motivated by the increasing number of applications of mixed models where interest is on the variance components, we study the effects of random effects misspecification on random effects inference in linear mixed models, for which there is considerably less literature. Our findings are surprising and contrary to general belief: for point estimation, maximum likelihood estimation of the variance components under misspecification is consistent, although in finite samples, both the bias and mean squared error can be substantial. For inference, we show through theory and simulation that under misspecification, standard likelihood ratio tests of truly non‐zero variance components can suffer from severely inflated type I errors, and confidence intervals for the variance components can exhibit considerable under coverage. Furthermore, neither of these problems vanish asymptotically with increasing the number of clusters or cluster size. These results have major implications for random effects inference, especially if the true random effects distribution is heavier tailed than the normal. Fortunately, simple graphical and goodness‐of‐fit measures of the random effects predictions appear to have reasonable power at detecting misspecification. We apply linear mixed models to a survey of more than 4 000 high school students within 100 schools and analyse how mathematics achievement scores vary with student attributes and across different schools. The application demonstrates the sensitivity of mixed model inference to the true but unknown random effects distribution.     

浅谈固定总价合同对承包商的利弊

本文集中就固定总价合同对承包商的利与弊进行了有效的分析与研究,对固定总价合同中的项目承包方的风险与风险控制提出了良好的解决策略,以期对承包商的利益与稳定发展提供良好的意见指导与帮助。     

CISG视角下争议解决费用的分摊

在国际货物销售合同纠纷中,争议解决费用往往是不可忽视的内容。在此基础之上,探讨CISG视角下的争议解决费用分摊问题兼具理论和实际意义。理论和实践中就CISG能否成为分摊争议解决费用的依据存在不同做法。差异背后的深层次原因在于有关方对CISG的立法精神和解释规则存在理解上的不同。本文支持依CISG分摊争议解决费用的观点,因为这不仅更契合于公约的精神,也更能实现公约适用的统一。域外的相关公约实践对我国同样具有借鉴意义。对于我国的有关实践,本文有4点建议:通过合同条款对争议解决费用的分摊加以明确;明确争议解决费用分摊的请求权基础;裁判主体应克服国内法思维,恪守公约精神进行条款的解释与适用;进一步明确争议解决费用分摊的国内法规则,从而实现国际法与国内法适用的统一。     

一种USB测控应答机的健壮捕获算法

在统一S频段（USB）测控应答机中频数字化处理的基础上，提出了一种健壮的相位调制(PM)信号捕获算法。针对USB测控应答机输入信号存在副载波时捕获易于假锁的问题，采用快速傅里叶变换(FFT)与锁频锁相环结合的算法，利用PM信号频谱对称的特点，快速获得残差载波的正确频率，防止捕获到副载波信号或者其他干扰信号上；采用锁频锁相环实现PM信号的精确捕获与跟踪，适应USB测控应答机大动态多普勒变化及高灵敏度的要求。通过仿真试验验证了该方案载波正确捕获的有效性，且接收灵敏度达到-121 dBm。