Consistent procedures for multiclass classification of discrete diffusion paths

The recent advent of modern technology has generated a large number of datasets which can be frequently modeled as functional data. This paper focuses on the problem of multiclass classification for stochastic diffusion paths. In this context we establish a closed formula for the optimal Bayes rule. We provide new statistical procedures which are built either on the plug-in principle or on the empirical risk minimization principle. We show the consistency of these procedures under mild conditions. We apply our methodologies to the parametric case and illustrate their accuracy with a simulation study through examples.     

Diffusion of Variegated Neoliberalization processes in Euro-Mediterranean policies: a strategic relational approach

ABSTRACT

Recent contributions to the study of neoliberalism have made considerable advances in transcending the dichotomy between understandings of the concept either as an ‘ideology’ or as a monolithic ‘structure’. In particular, the Variegated Neoliberalization (VNLT) approach has proposed an understanding of neoliberalism that relies on a path-dependent moment (i.e. the ‘uneven development of neoliberalization’) which is then followed by a path-shaping moment (i.e. the ‘neoliberalization of regulatory uneven development’). Such a perspective allows us to understand both systemic and contingent tendencies in neoliberalization processes across different geographies, transcending the socially constructed North–South divide. However, the VNLT approach has encountered a number of critiques, particularly in relation to its treatment of agency. In order to transcend these critiques and propose a more nuanced understanding of ways agents reflexively and recursively interpret and deepen – or refrain from deepening – neoliberal norms, I turn to the Strategic-Relational Approach (SRA) proposed by [Jessop, B. (2001). Institutional re(turns) and the strategic – relational approach. Environment and Planning A, 33(7), 1213–1235]. Through the SRA, it becomes possible to pinpoint both instances of ‘structured coherence’ and ‘patterned incoherence’ resulting from agential reflexivity in different contexts of neoliberalization. I will therefore turn to cases where these two patterns can be observed in the context of Euro-Mediterranean policies – that is, Morocco’s ‘structured coherence’ due to its internalized and deepening neoliberalization, and Egypt’s ‘patterned incoherence’ as a result of its still uneven development of neoliberalization.     

共享农庄的建设与发展研究——基于协同治理和政策扩散的视角

基于协同治理理论与政策扩散理论的视角,对比分析北京小毛驴市民农园、广州艾米农场、无锡田园东方、海南冯塘庄园等共享农庄建设与发展的经验性案例,从中概述共享农庄建设的典型模式,并归纳共享农庄的协同治理逻辑及扩散路径。分析指出:在共享农庄建设与发展过程中,努力构建政府、市场、农村社会之间的利益联结机制,有助于形成各主体联动赋能、良性互动的善治格局;在横向自发式的扩散路径中,政策学习与竞争始终是共享农庄政策扩散的关键环节,地方政府要善于从邻近区域的“政策样本”中汲取精华;在纵向推动式的扩散路径中,上级政府应通过完善支持机制、优化机制、“吸纳—辐射”机制等加速共享农庄政策扩散。     

喷气涡流纺喷孔数量对喷嘴内气流场的影响

为了研究喷孔数量对喷嘴内气流场的影响,应用FLUENT流体计算软件对喷嘴内部气流场进行数值模拟,并结合OriginPro对不同喷孔数量时喷嘴内部气流场状况进行比较和分析,深入解析喷孔数量对涡流场的影响。研究表明：喷孔数量对喷嘴内部气流场的特性影响较为明显,随着喷孔数量的增多,气流在喷嘴中形成的旋转运动增强,喷嘴入口处用以吸引纤维的负压也随之增大,对纱线的加捻特性也就越强。     

扩散过程进行速率的计算及讨论

基于非平衡系统的局域平衡假设，参照扩散不可逆过程中熵流密度与局域熵产生率的计算，对扩散过程中系统的自由能和吉布斯函数的流密度与局域自由能和吉布斯函数减小率进行了计算，并把它们和熵增加率作了比较和讨论．这些计算和讨论对用辅助热力学函数来研究不可逆过程进行的速率问题提供有益的参考．     

水力喷射压裂孔内压力分布研究

水力喷射压裂工艺是集水力射孔和压裂一体的新型油田增产技术。在室内实验基础上， 运用流体力学计算方法， 对水力喷射压裂孔道内压力场进行计算， 得到了井下水力射流在地层孔道内的压力及速度分布， 揭示了喷嘴空间位置、 喷嘴数量、 孔道形状、 喷嘴压降和喷嘴直径对孔道压力的影响规律。结果表明：高速射流之间具有很强的独立性， 喷嘴空间位置和喷嘴数量不会影响孔道内压力； 水力射流在不同形状孔道内产生的压力相同； 孔道压力随喷嘴压降和喷嘴直径的增大而增加。     

LEVY-LIBOR市场模型的蒙特卡罗模拟参数校准与估计

基于远期LIBOR利率的随机波动与无限跳跃特征，针对标准化LIBOR市场模型（LMM）和随机波动率LIBOR市场模型（SV-LMM）应用局限，进一步引入Levy无限跳跃过程，建立多因子非标准化Levy 跳跃随机波动率LIBOR市场模型（SVLEVY-LMM）。在此基础上，基于非参数化相关矩阵假设，运用互换期权（Swaption）、利率上限（Cap）等主要市场校准工具和蒙特卡罗模拟技术，对模型局部波动率和瞬间相关系数等参数进行有效市场校准；应用自适应马尔科夫链蒙特卡罗模拟方法（A-MCMC）对Levy跳跃与随机波动参数进行有效理论估计。实证认为，对远期利率波动率校准，分段固定波动率结构较为符合市场实际情况；对远期利率相关系数矩阵校准，非参数化相关系数矩阵具有最小估计误差和最佳的市场适应性；SVLEVY-LMM能够最好拟合远期LIBOR利率。     

地方、政治与声音景观:近代陕北民歌的传播及其演变

缘起于音乐学研究的声音景观，由于关注声音与环境之间的关系，强调声音在地方文化建构中的作用与意义，因此成为研究人地关系的重要内容。通过对近代中国重要的声音景观———陕北民歌的传播历程进行梳理，作者发现，陕北民歌由一个与陕北地方关系密切的声音景观，在演变成为中国革命的文化符号后，随着中国革命的胜利其地域分布迅速扩展到全国。在这一过程中，陕北民歌表面上与陕北地方之间的关系渐行渐远，但实质上，藉由唤起人们对中国革命圣地这一地方意象的记忆，陕北地方在陕北民歌地域扩展过程一直存在着或隐或现的关联。     

论六朝诗歌的传播与接受

六朝是我国诗歌传播史上一个重要的发展阶段。人们的传播意识随着文学地位的确立而觉醒，逐渐发达的造纸术也诗歌传播创造了有利的条件。此间诗歌传播中的酬唱赠答、歌妓乐工传唱、题壁与编选诗文集等活动都为诗歌的传播起了积极的推动作用。而读者的接受又对诗歌创作从题材、体裁、风格与流派的形成上产生一定的影响。     

Adding time to social movement diffusion

ABSTRACT

There is now a substantial literature on the diffusion of protest events, tactics, identities, and frames between locations and among movements. This paper asks how the patterns identified in this literature may change as the time scale of diffusion extends across single cycles of protest and beyond the life spans of individual activists. I focus especially on two types of differences: the changing weight of relational and non-relational channels of diffusion; and ways in which, over longer stretches of time, the mediation of diffusion by formal organizations, institutions, and public history works to filter the influence of past activism.