“云”中的猫咪

有数据表明,互联网数年前就已经被猫咪"攻陷",无数在现实生活中备感压力的人通过当下流行的"云吸猫"得到治愈。数千年来,猫从未像狗那样真正被人类驯化,它们生活在人类身边,却始终保持着神秘而高冷的属性,或许正因为如此,人们越发想要去亲近、了解它们。猫引领人们进入一个温柔而有灵性的世界,潜移默化中,让人重新认识与动物的关系。     

飞越最美航程

透过舷窗,眼前的景色似乎与画册里的不太一样,是的,你正在一万米的高空,用最特殊的视角欣赏这些极致美景。     

中国城市航空运输职能等级及航空联系特征的实证研究

本文依据城市航空运输资料,分析了中国城市航空运输职能等级层次,并揭示了城市航空运输联系所反映出的中国城市体系的宏观特征。     

THE ECONOMICS OF AIR TRAVEL GRAVITY MODELS*

Starting with the aggregate demand model of economics, a model of demand for intercity air travel is developed which contains the gravity model as a less general submodel. The more general model is referred to as the alternative opportunities model since it takes account of alternative destinations open to travelers, not just origin and destination as does the gravity model. The demand model approach has the virtue of providing a theoretical basis for understanding and analyzing the gravity model. The gains from treating alternative locations and demand motivation variables are a substantial increase in explanatory power over that yielded by the gravity model, the identification of statistically significant determinants of air travel, and better measurement of the coefficients of population and distance by taking account of these other variables and somewhat better forecasts. A shortcoming of procedures used here is aggregation of air trips with different purposes and thus lack of clear specification of the size of effects of different variables on different types of travel. Overcoming this difficulty must await origin-destination data listed by trip purpose.     

THE EFFECT OF THE REGIONAL WIND ON AIR POLLUTION IN HAMILTON, ONTARIO

Summary: By plotting low-volume aerosol counts as indices of pollution in Hamilton a pattern of dual pollution cells of equal intensity centring on the downtown business area and the heavy industrial zone emerges. Pollution levels are twice as great under east winds with accompanying atmospheric stability than for winds from all other sectors. With winds from the easterly sector the industrial pollutants are forced and locked into the lower city. When a major source of industrial pollution disappears, as happened during the 1969 shutdown of the Steel Company of Canada plant, the industrial cell vanishes and the pollution count under east winds drops to a level normal for other wind directions. With a wind change from the east to the west new pollution patterns are formed within six hours. The average pollution count for the city drops substantially but in the east end it increases as the pollution haze formerly trapped in the city is released and carried eastward.     

REGULATORY FEDERALISM AND THE DISTRIBUTION OF AIR POLLUTANT EMISSIONS*

ABSTRACT Recent empirical work suggests that (i) incomes are converging through time, and (ii) income and pollution levels are linked. This paper weds these two literatures by examining the spatial and temporal distribution of pollution. After establishing that theoretical predictions about whether pollution will converge are critically linked to certain structural parameters, we explore pollution convergence using state‐level data on two important pollutants—nitrogen oxides and sulfur oxides—from 1929 to 1999. We find stronger evidence of converging emission rates during the federal pollution control years (1970–1999) than during the local control years (1929–1969). These results suggest that income convergence alone may not be sufficient to induce convergence of pollutant emissions.     

飞行麻烦 保险出面

航班延误、行礼丢失、票证重办……航空公司总是不愿爽快地为你的经济损失买单。想要不再为飞行听小插曲烦恼,不妨找第三方出面解决问题。     

中国城市密集区航空运输联系研究

城市密集区间的航空运输联系导致城市间的内聚效应和空间互动。城市密集区间的航空运输联系具有明显方向性。京津唐、长江三角洲和珠江三角洲城市密集区间航空运输联系密切,国家级大都市与国家级大都市(区域性大都市)间联系具有普遍性,而与地方性城市中心间航空运输联系具有特殊性。长江三角洲、珠江三角洲和京津唐城市密集区等为人流与信息流联系密切的、以辐射为主的航空中心;辽宁中南部城市密集区为航空运输联系欠密切的、人流辐射与信息流集聚中心;四川盆地城市密集区为航空运输联系欠密切的、人流集聚与信息流辐射中心。     

环南海区域跨境航空网络空间结构演化

本研究收集2000、2010、2018年环南海区域各国家/地区间国际机场的跨境客运、货运航线和航班数目,探究近20年该区域跨境航空客运和货运网络的整体结构与空间格局演化特征,并综合客运和货运网络分析枢纽机场体系演化。研究发现：①该区域跨境航空网络的整体结构具有覆盖范围扩大、“小世界”效应明显和“无标度”特征显著的特点,但客、货运网络的演化存在差异。②该区域跨境航空客运网络具有明显的轴—辐组织结构特征,并呈现“多核心化”的演化趋势,而货运网络中以香港、新加坡为枢纽的轴—辐组织结构与局部性的“点—点”航空货运联系并存,尚未形成全局性的轴—辐组织结构。③该区域的区域客、货运枢纽机场发展呈现综合化、专业化趋势,香港（HKG）和新加坡（SIN）长期以来保持优势地位。     

心理地理学视角下空难暴露人群心理应激机制分析及其理论延伸

跟踪心理地理学相关网站信息和心理地理学情境主义“漂移”论代表性研究成果,开发一个二维的心理应激主观评测方法,通过情境下的深度访谈旨在从情境再现时空难暴露人群心理活动视角揭示其心理应激作用机制,将其具体概括为一个由时间过程特征和空间接近特征、个体心理应激行为和群体心理应激行为、消极心理反应和积极心理反应组成的相对应与互转化的组合范式,进而进行风险感知水平、心理意识力、区域差异的讨论,以说明情境“漂移”论对心理应激研究的支持。这项研究的特色在于将空难暴露人群心理应激机制研究建立在心理地理学情境“漂移”论的基础上,从而体现心理地理学的学科意义。     

降雨和空气污染对城市居民公共自行车使用的影响研究——以西安市为例

公共自行车交通（以下简称公自）作为近年来快速发展的新型公共交通模式,逐渐成为国内外相关学科的研究热点。国内外大量学者探索了公自的使用特征及影响因素,但关注天气条件对公自使用影响的研究不足,来自中国城市的实证证据更是缺乏。本文以西安市为案例,利用西安市公自系统运营数据,探索降雨和空气污染对城市居民公自使用的影响。研究结果表明：①降雨和空气污染条件下公自使用规模减少,但降雨带来的影响大于空气污染。②降雨和空气污染条件下公自站点中平衡站点比例减少,且公自借出和归还为主站点的冷热点区域空间分布发生显著差异。③降雨和空气污染对公自使用强度有显著影响,一级站点数量明显减少,且降雨的影响大于空气污染。降雨条件下公自使用高强度站点中心化和沿走廊分布的空间特征弱化。但空气污染条件下,无显著变化。研究结果有助于准确评估降雨和空气污染对于城市居民社会经济活动的影响程度,也能为更准确的研究城市居民公自使用的影响机制提供参考依据。