本原M序列二相编码雷达灵巧噪声干扰研究

基于利用前沿波形,通过预测超前获取雷达信号完整波形进而实施灵巧噪声干扰,提高 干扰能量利用效率的目的,对采用由n级移位寄存器产生的本原M序列的二相编码雷达 的编码预测问题进行了研究。给出了监测全零子序列,进而利用获得的最多前2n＋2个 码元,解n元线性方程组,预测获得完整M序列的方法。     

Where did all the remittances go? Understanding the impact of remittances on consumption patterns in rural China

We focus on the impact of migrants’ remittances on consumption patterns in China. Using a large homogenous sample of rural households surveyed in 2001 and 2004, we find that remittances are spent on nonhousing consumption expenditures at the margin, virtually dollar-for-dollar, when we instrument remittances and local employed earnings using proxies of social networks. Our findings are robust to intra-household division of labour and to fixed-effect for the county in which the respondents are registered. These results imply that rural households largely take remittances as permanent income and are consistent with the prevalence of circular and repeat migration in China.     

时间维度视角下创业行为的动态特征——成因分析与实证研究

基于CPSED三轮调查数据,选择处于创建过程中的新生企业为研究对象,通过对时间维度视角下创业行为的动态特征规律及形成机理的研究发现:(1)创业者先前经历能够直接影响创业行为的选择与决策。创业者先前创业经历与创业行为集中度之间为正向显著的相关关系,创业者先前产业经历与创业行为集中度之间为负向显著的相关关系。结果表明,创业者先前经历所蕴含的知识属性并不相同,对外在化的创业行为的选择与决策影响力不同。(2)创业机会的创新程度在创业行为的选择与决策中扮演着重要角色,产品创新、技术创新与行为速度负相关;技术创新、市场创新与行为集中度负相关。研究结论揭示了新企业生存与成长的一般规律及内在机理。     

Diversity of innovation patterns in services

Recently, literature on innovation in service activities has increased significantly. Much effort has been concentrated on understanding the importance of innovation for these activities, and on stressing innovative differences relative to the manufacturing innovation model. However, a deeper understanding is needed in three main areas: the degree of innovation heterogeneity among different service activities, the factors that explain this heterogeneity, and the primary drivers of the innovation process for each activity. Using results from the Third Community Innovation Survey, this paper aims to identify the extent to which there are similarities and differences in the main innovation attributes in four important service sub-sectors. After describing the characteristics of innovation and the behavior of variables in the sub-sectors, a typology of innovation patterns is identified.     

Liberty,equality, and impossibility: some general results in the space of ‘soft’ preferences

This paper is concerned with examining the mutual compatibility of the ethical principles of equity and liberty in a social choice framework of ordinally formulated vague preferences. With sufficiently weakened versions of the liberty and equity principles, one can secure an existence result in a ‘relation‐functional’ setting. However, difficulties tend to re‐appear in a ‘choice‐functional’ setting, when one subscribes to the notion that while preference may be vague, choice must perforce be exact.     

On innovation patterns and value-tensions in public services

In the innovation studies literature, innovation patterns have been described, such as science-based and practice-based innovation, that vary among industrial sectors. As a consequence, firms become distinguished with respect to their typical innovation pattern. Less attention has been paid to the possibility of intertwined innovation patterns. Focusing on public sector services, this paper argues that intertwined innovation patterns emerge within public services as a response to value-tensions. Values can be defined as measures for beneficial behaviour that guide innovation. Value-tensions in public services include tensions between the political, economic, communal, aesthetic and intellectual values. The contribution of the paper to service innovation research is the emphasis on the concept of intertwined innovation patterns, such as the intertwinement of science-driven and task-driven innovation. Furthermore, the paper contributes by pinpointing how varied values guide innovation in public services.     

城乡居民膳食结构变迁对耕地资源的影响 ——基于1981—2019年中国城乡居民食物消费数据

研究目的：厘清城乡居民膳食需求与耕地资源之间的相互关系,以期为保障城乡居民健康营养的膳食需求及耕地资源的可持续利用提供科学参考。研究方法：膳食营养分析、耕地足迹方法。研究结果：（1）近39年来城乡居民植物性食物比例日趋减少、动物性食物比例上升,膳食能量、蛋白质、脂肪与胆固醇近几年均呈上升趋势,城乡膳食结构与营养差异在缩小;（2）受膳食结构、农业生产力及人口影响,城乡居民的人均膳食耕地足迹较于20世纪80年代均有所减少,但城乡居民的总膳食耕地足迹波动中有所上升,城镇居民的总膳食耕地足迹增加,农村居民的总膳食耕地足迹有所减少;（3）提高水果及奶类食物比例、减少畜肉食物是未来城乡居民膳食优化方向;（4）预计2030年中高能量理想膳食模型的耕地足迹将进一步增加,甚至超过中国现有耕地面积。研究结论：城乡居民膳食变迁将进一步加大耕地保护的压力,耕地保护对于保障国民健康营养膳食具有关键性的作用。     

企业自主品牌创新核心技术开发路径与模式研究

自主品牌核心技术开发是企业自主品牌创新的首要目标,是获取自主品牌核心竞争能力的源泉。文章对企业自主品牌创新核心技术内涵与特征进行了辨析,给出了自主品牌创新核心技术开发的主要路径,详细阐述了自主品牌创新核心技术开发运行模式,这为企业提升自主品牌创新能力和获取自主品牌创新核心技术提供了理论和实践依据。     

江汉平原农户焚烧秸秆决策行为影响因素解析以荆州市为例

目的 江汉平原作为全国重要的粮食产区,其焚烧秸秆的现象仍然屡禁不止,特别是秋收季节,对当地大气环境造成了较大影响。调查江汉平原农户焚烧秸秆的行为,旨在了解农户焚烧秸秆行为决策的影响因素。方法 文章通过问卷调查方法,在荆州市荆州区、沙市区、公安县、监利县等县市的13个村随机选取了320名农户作为调查样本,进行了实地调查,并且运用二元Logistic回归分析对问卷结果进行统计分析。结果 （1）农户秸秆焚烧行为受到内外因素共同作用,其中农户年龄、文化程度、政府提供秸秆综合利用技术指导、宣传力度与监察力度的大小均对农户焚烧秸秆决策行为有显著影响,是影响秸秆焚烧行为产生的关键因素（P<0.05）;（2）年龄、文化程度、政府提供技术指导、禁烧政策宣传力度和政府监察力度均与农户焚烧秸秆决策行为呈负相关关系（B<0）。结论 年龄较大、文化程度越高的农户越不易焚烧秸秆,政府禁烧政策宣传力度越大、监察力度越大、对农户提供的技术指导越多,农户们越不易对秸秆进行焚烧,可为相关部门在制定秸秆禁烧政策时提供科学参考。     

物流产业融合的驱动力、模式与战略思路

为给物流产业融合提供理论架构和政策支持,在对产业融合理论归纳的基础上,提出了物流产业融合的基本概念框架,并进一步研究了物流产业融合的驱动力:即对商业利益的Ψ求、物流服务供需关系、物流服务创新和全球价值网络嵌入;探索了物流产业融合的主要模式:"价值模块镶嵌"型融合模式、"纵横交错渗透"型融合模式以及"价值网络重组"型融合模式;在上述研究的基础上,提出了中国物流产业融合"三位一体"的战略思路。