微波带状线低通滤波器的设计制作与性能改善

讨论了带状线低通滤波器因实际制作的导带宽度发生变化引起滤波器性能下降时,如何改善滤波器性能的方法。我们采用惠普公司ＥＥＳＯＦ软件,对滤波器的结构和电气参数和分别作了灵敏度分析,以此为改善滤波器性能的依据。经实验对比,改进后的滤波器性能有了明显改善,且性能稳定。     

Adoption of farm‐based irrigation water‐saving techniques in the Guanzhong Plain,China

This article analyses adoption of farm‐based irrigation water saving techniques, based on a cross‐sectional data set of 357 farmers in the Guanzhong Plain, China. Approximately 83% of the farmers use at least one farm‐based water‐saving technique. However, the traditional, inefficient techniques border and furrow irrigation are still prevalent whereas the use of advanced, more efficient techniques is still rather rare. We develop and estimate an adoption model consisting of two stages: awareness of water scarcity and intensity of adoption. We find that awareness of water scarcity and financial status enhance adoption of more advanced techniques whereas access to better community‐based irrigation infrastructure discourages it. We furthermore find both community‐based irrigation infrastructure and farm‐based irrigation water‐saving techniques have mitigating effects on production risk. From the results it follows that adoption can be stimulated via financial support and via extension aimed at enhancing awareness of water scarcity.     

The impacts of governance and institutions on inbound tourism demand: evidence from a dynamic panel data study

This study explores the impact of governance and institutions on inbound tourism demand in Malaysia using a dynamic panel data approach for 45 tourism source countries over the period 2005–2015. The results show that institutions play a very important role in explaining the behaviour of inbound tourism demand. To obtain a better picture, we investigate the response of international tourists to disaggregated institutional quality. We find that international tourists are more concerned about political stability, governmental effectiveness, regulations, laws, and corruption than voice and accountability. Therefore, policymakers should focus on ways to improve institutional quality to significantly increase international tourist arrivals.     

Job stress and well-being of female employees in hospitality: The role of regulatory leisure coping styles

The job stress and coping behavior of female employees has become a key issue in the hospitality industry. This study investigates the moderating role of regulatory leisure coping styles on the effect of job stress on female employees’ well-being. Specifically, this study extends Patry et al.’s (2007) findings to further confirm the direct and moderating role of regulatory leisure coping styles in the relationship between job stress and well-being. Data were collected from the female employees of 22 tourist hotels in Taiwan. The results showed that the Planned-Breather Leisure Coping Style (PBLCS) was positively and significantly associated with well-being, whereas the Avoidant Leisure Coping Style (ALCS) had a negative and significant effect on it. In addition, the results also revealed that the PBLCS plays a buffering role, but that the ALCS plays an amplifying role. Based on these findings, the implications and research suggestions are then discussed.     

絮凝沉淀去除马铃薯淀粉加工废水中蛋白的试验研究

采用絮凝沉淀法去除马铃薯淀粉废水中的蛋白质。经过方案比选．最终选择聚丙烯酰胺作为絮凝剂,结果表明：在聚丙烯酰胺投加量为70mg／L,pH值为5,温度为20℃,反应时间40min的最佳工艺条件下。采用聚丙烯酰胺絮凝沉淀法对马铃薯淀粉加工废水中的COD、蛋白质、BOD、SS都有一定的去除效果。COD的去除率保持在30％～40％,蛋白质的去除率保持在45％～55％,BOD的去除率保持在10％-15％．SS的去除率保持在50％-60％,大大减轻了后续处理构筑物的负担。     

港口集装箱运输与腹地经济发展

港口集装箱运输与腹地经济发展是一种互动关系.港口集装箱运输的发展主要取决于腹地内集装箱的生成量和运输条件、运输费用等方面.同时,集装箱运输对腹地经济的发展也正在发挥着越来越重要的作用.本文主要选择上海、天津、广州、青岛、大连、宁波、深圳等亿吨港口为研究对象,从集装箱吞吐量、港口吞吐量以及腹地经济发展的角度,分析港口集装箱运输与腹地经济的互动及其变化趋势、现存问题,并提出互动发展的对策.     

国内外养老地产发展文献综述

在中国人口老龄化加快的背景下,探讨如何建立养老地产体制显得尤为迫切。国外养老地产发展相对较早,有着丰富的经验。文章对国内国外的学者在养老地产方面的研究做一个归纳与总结,试图为国内学者后续研究提供线索和框架,对政府部门和我国养老地产投资者提供理论指导和借鉴。     

蛋白质消化率的影响因素研究

蛋白质对人体有重要的生理功能,消化率是反映其营养价值的重要指标,受蛋白质来源、原料粒径大小、原料成熟度、蛋白质改性、非蛋白质成分和加工工艺等因素影响.本文对影响蛋白质消化率的因素作综述.     

壮大广西油茶产业 保障国家粮油安全

广西是我国西部地区的农业大省,具有种植油茶的优越自然条件和社会经济条件。广西的油茶面积和产量均居全国第三位,为了更好地促进广西油茶产业的进一步发展,该文探讨了广西发展油茶产业的战略意义,分析了其发展现状及存在问题,并提出了相应的对策措施。     

河北省张宣葡萄产区土壤地球化学特征

[目的]为科学合理规划特色农产品种植区,因地制宜地扩大张宣葡萄种植规模。[方法]文章通过对张宣葡萄产区开展1:5万农业生态地质现状调查,利用土壤地球化学测试数据,与河北省平原区背景值、张家口盆地背景值进行对比分析,归纳总结研究区土壤地球化学特征;并依据土地质量和土壤环境质量相关规范,对张宣葡萄产地进行系统地土壤肥力和土壤环境质量评价。[结果]葡萄种植区土壤中铜、锶、二氧化硅、氧化钾含量较高,尤以铜最为显著,含量均值是张家口盆地背景值的2倍,是河北省平原区背景值的1. 94倍;铬、镍、铁、锰、氮、有机碳、硒、镁含量相对较少,均低于张家口盆地背景值和河北省平原区背景值。整体而言,土壤综合肥力相对缺乏,主要表现为氮、磷缺乏;土壤环境综合质量较为清洁,无Ⅲ类区,全部重金属元素均未超风险管制值,99. 26%的面积低于全部重金属元素风险筛选值,表现为4个样点铜含量和1个样点镉含量高于风险筛选值,分别位于宣化区和涿鹿县境内。[结论]应通过增施化学肥料提高土壤中氮、磷含量,注意防治保护性杀菌剂的使用带来的铜局部累积现象。