二元非乘积型广义Baskakov算子的逼近性质

引进二元非乘积型广义Baskakov算子，利用多元分解技巧及一元的结果得出该算子的两个逼近性质定理．     

The anti-policy of European anti-smuggling as a site of contestation in the Mediterranean migration ‘crisis’

ABSTRACT

This article analyses the European anti-smuggling agenda as an anti-policy that derives legitimacy from fighting ‘bad things’, in terms that mask political disagreement. By juxtaposing the agenda to the experiences and understandings of those whom such measures affect most directly – people migrating without authorisation to the EU – it uncovers the productivity of anti-smuggling and the political contestations surrounding it. Based on a qualitative analysis of 257 interviews carried out with 271 people who travelled – or sought to travel – across the Mediterranean Sea by boat using smuggling networks, the article highlights the complicity of governing authorities and officials with smuggling networks and practices, as well as the diversity and ambivalences of relationships between smugglers and the smuggled. Going further, the article points to the specific ways in which anti-smuggling is contested by those on the move, which expose a central political disagreement over the legitimacy of mobility across borders.     

Prices,Markups, and Trade Reform

This paper examines how prices, markups, and marginal costs respond to trade liberalization. We develop a framework to estimate markups from production data with multi‐product firms. This approach does not require assumptions on the market structure or demand curves faced by firms, nor assumptions on how firms allocate their inputs across products. We exploit quantity and price information to disentangle markups from quantity‐based productivity, and then compute marginal costs by dividing observed prices by the estimated markups. We use India's trade liberalization episode to examine how firms adjust these performance measures. Not surprisingly, we find that trade liberalization lowers factory‐gate prices and that output tariff declines have the expected pro‐competitive effects. However, the price declines are small relative to the declines in marginal costs, which fall predominantly because of the input tariff liberalization. The reason for this incomplete cost pass‐through to prices is that firms offset their reductions in marginal costs by raising markups. Our results demonstrate substantial heterogeneity and variability in markups across firms and time and suggest that producers benefited relative to consumers, at least immediately after the reforms.     

PR practitioners’ use of social media tools and communication technology

As social media moves from “buzz word” status to strategic tool, more practitioners are developing skills related to this online communication technology. This study surveyed working public relations practitioners about their adoption of 18 social media tools and their perception on the growth of social media trends in public relations practice. Results provide an overview of the adoption of social media, as a whole, in the industry.     

自然形态下的口语和书面语溶合结构研究——俄语讲演语篇特点探究

以系统功能语言学为理论框架,指出语言表达手段与修辞之间的紧密联系。讲演正是从语言系统中不断选择恰当的语言形式,从而产生结构,实现其交际意图的过程。     

Methodological nationalism and beyond: nation–state building,migration and the social sciences

Methodological nationalism is understood as the assumption that the nation/state/society is the natural social and political form of the modern world. We distinguish three modes of methodological nationalism that have characterized mainstream social science, and then show how these have influenced research on migration. We discover parallels between nationalist thinking and the conceptualization of migration in postwar social sciences. In a historical tour d’horizon, we show that this mainstream concept has developed in close interaction with nation–state building processes in the West and the role that immigration and integration policies have played within them. The shift towards a study of ‘transnational communities’— the last phase in this process — was more a consequence of an epistemic move away from methodological nationalism than of the appearance of new objects of observation. The article concludes by recommending new concepts for analysis that, on the one hand, are not coloured by methodological nationalism and, on the other hand, go beyond the fluidism of much contemporary social theory.