西藏高原县域尺度农业绿色发展水平综合评价——以白朗县为例

[目的]推进农业绿色发展是实现农业可持续发展的有效途径,为客观了解西藏高原农业绿色发展水平,探讨农业绿色发展的驱动因素,为高原农业绿色发展研究提供参考。[方法]文章以白朗县为典型县域案例,从农业生产、农业资源、农业环境、农业生态和农民生活五方面,选取17个指标系统构建评价体系,采用层次分析法确定评价指标的权重值,基于统计数据、遥感数据和调研数据评价2016—2020年白朗县农业绿色发展水平,并利用两阶段最小二乘法分析影响农业绿色发展水平的驱动因素。[结果]（1）2016—2020年白朗县农业绿色发展水平总体呈现上升趋势,由2016年的0.102 7提高到了2020年的0.233 9,增长约2.28倍。其中,农业生产、农业环境和农民生活水平逐年提升,但农业资源水平2018年后却持续下降。（2）多元回归模型分析驱动因素表明农林水事务性支出与农业绿色发展水平存在显著的负效应（P<0.001）,随着农林水事务性支出的降低,农业绿色发展水平会提高。[结论]白朗县农业绿色发展水平整体呈现良好的发展态势,农业生产和农民生活方面贡献较大,但农业资源方面仍是绿色发展的短板,因此今后白朗县农业绿色发...     

资源型企业员工绿色行为影响因素——基于扎根理论的探索性研究

资源型企业以其传统的商业模式和突出的外部性对生态环境造成了不可逆转的破坏,日益严重的环境问题也对其原有的经营管理模式提出了挑战。员工绿色行为决定了组织环保成效,是促进组织可持续发展的关键。在相关文献讨论的基础上,通过对资源型企业员工的深度访谈,运用扎根理论研究方法,探索性地构建资源型企业员工绿色行为影响因素模型。以此为基础,进一步探讨影响因素模型中主范畴的作用方向和作用路径,在理论上丰富资源型员工绿色行为影响因素的相关研究,在实践上为资源型企业绿色管理模式提供有益借鉴。     

政府创新补贴对中国工业自有研发支出的影响研究 ——基于空间计量模型

从空间关联视角再审视政府创新补贴的效应,并基于2001—2017年我国省际面板数据,运用空间面板模型分析了政府创新补贴对中国工业自有研发支出的影响。结果表明,政府创新补贴显著激励了本省市工业自有研发支出,同时,也正向影响相邻省市工业自有研发支出。在控制了内生性问题后,该结论依然成立。另外,在不同所有制和创新水平下,政府创新补贴对工业自有研发支出的空间影响效果存在差异。根据研究结论,本文提出加大政府创新补贴力度并充分考虑溢出效应、融合政府激励和市场驱动以及营造支持成功创新的环境等4项政策建议。     

景观环境常用有机地表覆盖物的吸水 性能研究

有机地表覆盖物具有滞留雨水、降低地表径流的作用。为优选适用于城市雨水管理的有机地表覆盖物，选择16种景观环境常用有机地表覆盖物材料，对其材料密度、质量吸水倍率、质量吸水速率、体积吸水倍率、体积吸水速率和饱和时长进行了测定。结果表明：1)质量吸水倍率：锯末和花生壳表现最好，蚯蚓粪表现最差；2)质量吸水速率：各材料0~10min内的质量吸水速率均为最高，而后下降较快，第10min时，16种材料的质量吸水率占比平均为75.60%，最低的核桃壳为51.22%，最高的复叶槭粉碎物达89.42%；3)体积吸水倍率：锯末、蚯蚓粪、花生壳和柳树皮的体积吸水倍率表现较好，松针和打磨松树皮(3~5cm)表现较差；4)体积吸水速率：各材料0~10min内的体积吸水速率规律与质量吸水速率一致，打磨松树皮(3~5cm)、松针和核桃壳的体积吸水速率较小，最高的锯末是打磨松树皮(3~5cm)的8.83倍；5)饱和时长：花生壳用时最短，25min就达到饱和状态，松塔壳用时最长，为60min。研究结果可为城市地面及屋顶绿化所需有机地表覆盖物的优选提供参考依据。     

E-retailers and the engagement of delivery workers in urban last-mile delivery for sustainable logistics value creation: Leveraging legitimate concerns under time-based marketing promise

This paper's research aims to understand how e-retailers can benefit from independent contractors' (delivery drivers') agile engagement under time-based marketing promise (TBMP) to advance sustainable logistics value creation in the urbanised last-mile-delivery (ULMD) environment. Our analysis of independent drivers' narratives (n = 30) reveals that sustainable logistics value can be apprehended through a process in which independent workers are both agenced by their leveraging of technologisation and task autonomy and concerned by the mobilisation of other ULMD stakeholders. They thus can propose novel, creative solutions for e-retailers and city planners towards sustainable logistics value creation.     

Equilibria in a large production economy with an infinite dimensional commodity space and price dependent preferences

We prove the existence of a competitive equilibrium in a production economy with infinitely many commodities and a measure space of agents whose preferences are price dependent. We employ a saturated measure space for the set of agents and apply recent results for an infinite dimensional separable Banach space such as Lyapunov’s convexity theorem and an exact Fatou’s lemma to obtain the result.     

一种利用压缩感知改进的PMF-FFT扩频捕获算法

为了实现直接序列扩频（DSSS）信号快速捕获的同时降低数据量和硬件资源消耗，引入了压缩感知理论改进部分匹配滤波-快速傅里叶变换（PMF-FFT）算法，提出了基于压缩感知改进的部分匹配滤波-快速傅里叶变换（CSPMF-FFT）算法。该算法将PMF-FFT算法与压缩感知理论相结合，先对信号进行稀疏性分析和压缩观测，然后从少量压缩观测值中重构信号，并利用输出的峰值信息估算信号的多普勒频移和码相位，从而实现捕获。理论分析和仿真实验表明，相较于PMF-FFT捕获算法，CSPMF-FFT算法能在成功完成捕获的同时有效地减少相关器的数目和FFT变换的运算量，从而降低系统数据量和硬件资源压力，为基于压缩感知的扩频信号处理技术研究奠定了基础。     

Social business collaboration at the bottom of the pyramid: The case of orchestration

Social business orchestrators (SBOs) help social businesses of various sizes to tackle major societal issues by filling gaps in knowledge and resources. However, research has overlooked these types of collaboration. Situated within a bottom of the pyramid context in Bangladesh, the current study sheds light on the process of value creation for SBO–social businesses partnerships by comparing different collaboration partners. Multiple case study research through the lens of the relational view were used to ask how SBOs facilitate value creation in social businesses by flexibly adapting resource inputs and governance mechanisms to the specific endowment and size of partners; this approach was informed by interviews and field note analyses. The combined deductive–inductive analysis enhances knowledge of idiosyncrasies of SBO–social business collaborations. Our study draws attention to the role of large orchestrators, whose model could be scaled and transferred to other world regions, including industrialised countries.     

以精品工程理念打造智能铁路的内在逻辑

当前中国智能铁路的发展进入了快车道，而建设精品工程是与智能铁路相伴实施推行的重要理念。基于对精品工程和智能铁路基本内涵和本质特征的深刻分析，阐明二者之间存在着密切的逻辑关联。进一步从愿景目标、关键技术和主要理念3点共性，以及精品工程与智能铁路交互融合所产生的作用机理两个角度具体分析二者间的有机关系。最后，从安全优质、美观低碳、创新服务、标准规范和长远谋划5项遵循着力，提出今后打造智能铁路精品工程项目的原则性建议。     

Investigating consumers’ green values and food‐related behaviours in Turkey

This study sets out to examine the influence of consumers’ green values on food‐related behaviours. Data were collected from a random sample of 385 consumers in Izmir, Turkey via face‐to‐face interviews. Factor analysis was conducted to identify the underlying dimensions that capture the meaning of green values, which affect shopping, cooking and eating behaviours of consumers. A composite variable that represents consumers’ perception of green values was created to classify consumers into two segments labelled: Negative perceivers (37.7%) and positive perceivers (62.3%). The results indicated that the positive perceivers tended to have healthier and environmentally friendly food consumption behaviours than the negative perceivers. Gender, age, education, marital status, body mass index, regular exercise and smoking were significant for differentiating between the segments. We intend to construct value‐based intervention programmes that are easy to implement, non‐mandatory and cost‐effective for the negative perceivers.