短租民宿在线评论语义网络及感知维度研究——基于途家网和Airbnb的文本挖掘

基于途家民宿网与Airbnb在线评论信息,采用扎根理论、语义关联法与社会网络分析法定性与定量对比分析了在线评论语义网络结构特征及消费者感知维度。结果表明:①网络结构上,消费者关注焦点集中、小世界网络特征明显、社区间联系紧密。②短租民宿与传统酒店消费者感知维度在房源质量、服务态度与位置维度相似,在主客互动与装修风格上存在差异。③途家消费者更倾向于对房源进行评价,而Airbnb的主客互动性成为吸引消费者的关键因素。研究结果为短租平台从房源质量、房东素质、消费者差异化与运营模式4个方面吸引消费者提供了参考。     

Comparison of different valent iron on anaerobic sludge digestion: Focusing on oxidation reduction potential,dissolved organic nitrogen and microbial community

• ORP value from −278.71 to −379.80 mV showed indiscernible effects on methane yield. • Fe(II) and Fe(III) promoted more degradation of proteins and amino acids than Fe⁰. • The highest enrichment of Geobacter was noted in samples added with Fe⁰. • Cysteine was accumulated during iron enhanced anaerobic sludge digestion. • Both iron content and valence were important for methane production. This study compared effects of three different valent iron (Fe⁰, Fe(II) and Fe(III)) on enhanced anaerobic sludge digestion, focusing on the changes of oxidation reduction potential (ORP), dissolved organic nitrogen (DON), and microbial community. Under the same iron dose in range of 0−160 mg/L after an incubation period of 30 days (d), the maximum methane production rate of sludge samples dosed with respective Fe⁰, Fe(II) and Fe(III) at the same concentration showed indiscernible differences at each iron dose, regardless of the different iron valence. Moreover, their behavior in changes of ORP, DON and microbial community was different: (1) the addition of Fe⁰ made the ORP of sludge more negative, and the addition of Fe(II) and Fe(III) made the ORP of sludge less negative. However, whether being more or less negative, the changes of ORP may show unobservable effects on methane yield when it ranged from −278.71 to −379.80 mV; (2) the degradation of dissolved organic nitrogen, particularly proteins, was less efficient in sludge samples dosed with Fe⁰ compared with those dosed with Fe(II) and Fe(III) after an incubation period of 30 d. At the same dose of 160 mg/L iron, more cysteine was noted in sludge samples dosed with Fe(II) (30.74 mg/L) and Fe(III) (27.92 mg/L) compared with that dosed with Fe⁰ (21.75 mg/L); (3) Fe⁰ particularly promoted the enrichment of Geobacter, and it was 6 times higher than those in sludge samples dosed with Fe(II) and Fe(III) at the same dose of 160 mg/L iron.     

创新型社会生活噪声污染防治体系构建研究

社会生活噪声具有量大、面广、分散、影响不持续、监管难度大等特点，本文以现代化环境治理视角和社会治理视角深入剖析了我国当前社会生活噪声污染防治存在的问题，结合社会生活噪声污染防治的特殊属性及其防治的有效实践，分析2021年新修订的《中华人民共和国噪声污染防治法》中防治措施的内在联系，提出构建创新型社会生活噪声污染防治体系。该体系要求在政府主导的环境治理领域充分发挥社会各界的力量，强化社会共治，新增公众自治，将环境治理同社会治理有机结合，既强调公众参与到政府主导的环境治理工作中，又强调社会各主体多元共治和自我管理，是社会生活噪声领域公众参与的升级版。最后，本文建议以宁静区域创建为切入点，通过有关监管部门联合发布宁静区域创建指导意见；地方政府落地实施，完善管理和技术指标体系；加大宣传教育，提高德治和自治水平，以点带面逐步拓展宁静区域范围，实现创新型社会生活噪声污染防治体系的实质有效性。