Modelling of the nitrogen cycle in farm land areas

The authors propose a method of modelling the cycles of water and nitrogen in the soil in order to simulate the drainage flow of water and the flow of leached nitrate, the main inputs into a model of transfer in aquifers. The processes of the N cycle included here are: mineralization, nitrification, ammonium adsorption-desorption, immobilization of N from ammonium and nitrate, N uptake by plants and leaching of nitrate. The results of a limited test of the model using data from Dutch experimental farms showed that, on the whole, measured and simulated values were in reasonably good agreement, in spite of the relative simplicity of the model. However, the simulations do not give detailed information concerning the dynamics of nitrogen in the various layers in the soil.     

基于松弛预留策略的连续双向拍卖模型

针对网格资源的松弛预留问题,提出一种改进的连续双向拍卖模型。在网格资源定价策略中,引入松弛时间保证更高的任务预留接纳率。在用户出价和要价策略中,买方通过剩余时间和剩余资源量出价,卖方根据负载情况要价。仿真实验结果表明,对于具有费用约束的网格任务,该模型能增加约21%的资源总收益,提高约15%的资源利用率。     

中国绿证市场的现状分析与交易机制优化

在绿色电力证书（tradable green certificate, TGC）市场中,采用有效的交易机制和竞价策略对提高市场效率有着至关重要的作用。首先,在现阶段我国绿证市场采取自愿认购的框架下,介绍了我国的绿证交易机制,并从绿证定价和市场绩效两方面分析了我国绿证市场现状;然后,为了提高市场效率和社会福利提出了多回合集合竞价交易机制,考虑到需要多回合的报价和投标,设计了粒子群优化（particle swarm optimization, PSO）自适应竞价策略,使得买卖双方可以根据市场情况及时调整竞价策略;最后,通过仿真验证了交易机制和竞价策略的可行性和有效性。     

德国柏林荷兰大使馆

本文从对基地的分析，空间形体组织等方面简要介绍了OMA设计的柏林荷兰大使馆的设计构思。     

Successful Brazilian experience for promoting wind energy generation

This paper reviews the Brazilian experience with support mechanisms to promote renewable energy generation, from feed-in tariffs in the early 2000?s to the current auction process, with a focus on wind energy generation. Brazil’s original and innovative approach includes investment coordination mechanisms that have reduced risks enough to make wind energy a viable option.     

Bevk Perovic arhitekti

An exciting new crop of young Slovenian architects is coming out of Ljubljana. Valentina Croci explores the work of Bevk Perovic arhitekti, a practice whose finely honed hybrid approach owes as much to the contextualism of the great Ljubljanan master Joze Plecnik, as Vasa Perovic's exposure to contemporary Dutch architectural thought and design at the Berlage Institute in Amsterdam. Copyright © 2005 John Wiley & Sons, Ltd.     

Groet uit Java: Picture Postcards and the Transnational Making of the Colony around 1900

This article explores the transnational visual language of picture postcards and the international business networks responsible for producing and disseminating the image of Dutch colonialism around 1900. Following a microhistorical approach, I consider the multilayered representation and transnational production of one particular postcard sent from colonial Indonesia to the Netherlands in 1900. The postcard established, visualised, and catalysed colonialism through its use of a European visual language. Colonialist meaning was attached to the image in Germany and was reinforced through the process of the postcard’s delivery from colony to metropolis. This article moves beyond a nation-based framework and instead analyses the meanings of colonial imagery in transnational contexts.     

基于agent的连续双向拍卖人工股市建模研究

我国股票市场是连续双向拍卖的订单驱动市场,而在连续双向拍卖人工股市的仿真研究中,目前发现的仿真模型均是在Swarm中实现的[1],用Java实现的仿真模型尚未发现。对仿真得到的数据进行了分析,仿真数据表明,真实股票市场中的一些典型特征都可在本文模型的仿真过程出现。     

基于拍卖理论的招投标经济分析

文章根据拍卖理论与招投标的相似性,构建招投标经济分析模型,从项目投标方（卖方）的角度分析其收益最大化的问题,得出了与竞争人数和报价分布函数相关的标价函数,并从项目招标方（买方）证明了其收益的等价性,为进行招投标经济分析提供了新的视角。