施普林格·自然：以多种出版模式满足研究人员的需求

 自21世纪初开放获取运动兴起以来，科学研究过程中的文献访问障碍在一定程度上被消除，学术出版传播的模式也不断革新。随着互联网、大数据、人工智能等现代技术发展日益成熟并广泛运用于学术出版与交流，科技期刊已经从传统的、印刷形式为主的静态单刊，演化为单刊数字平台、刊群平台、集团平台、纯数字平台。三大变革影响着科技出版的过去和未来。第一是印刷向数字出版的过渡，期刊出版已将近完成了这一转变，这一数字化转变可称为可及性的变革。第二是由订阅模式向开放获取的转变，这一进程大概已完成了1/4，这可称作读者/用户的变革，因为它扫除阻挡研究成果被人阅读、使用和再使用的剩余障碍，对科研的未来至关重要。目前，正在进入一个扩展阶段，即从内容服务扩展到解决方案服务。     

Ionic colloidal crystals of oppositely charged particles

Colloidal suspensions are widely used to study processes such as melting, freezing and glass transitions. This is because they display the same phase behaviour as atoms or molecules, with the nano- to micrometre size of the colloidal particles making it possible to observe them directly in real space. Another attractive feature is that different types of colloidal interactions, such as long-range repulsive, short-range attractive, hard-sphere-like and dipolar, can be realized and give rise to equilibrium phases. However, spherically symmetric, long-range attractions (that is, ionic interactions) have so far always resulted in irreversible colloidal aggregation. Here we show that the electrostatic interaction between oppositely charged particles can be tuned such that large ionic colloidal crystals form readily, with our theory and simulations confirming the stability of these structures. We find that in contrast to atomic systems, the stoichiometry of our colloidal crystals is not dictated by charge neutrality; this allows us to obtain a remarkable diversity of new binary structures. An external electric field melts the crystals, confirming that the constituent particles are indeed oppositely charged. Colloidal model systems can thus be used to study the phase behaviour of ionic species. We also expect that our approach to controlling opposite-charge interactions will facilitate the production of binary crystals of micrometre-sized particles, which could find use as advanced materials for photonic applications.     

施普林格·自然：以多种出版模式满足研究人员的需求

 自21世纪初开放获取运动兴起以来，科学研究过程中的文献访问障碍在一定程度上被消除，学术出版传播的模式也不断革新。随着互联网、大数据、人工智能等现代技术发展日益成熟并广泛运用于学术出版与交流，科技期刊已经从传统的、印刷形式为主的静态单刊，演化为单刊数字平台、刊群平台、集团平台、纯数字平台。三大变革影响着科技出版的过去和未来。第一是印刷向数字出版的过渡，期刊出版已将近完成了这一转变，这一数字化转变可称为可及性的变革。第二是由订阅模式向开放获取的转变，这一进程大概已完成了1/4，这可称作读者/用户的变革，因为它扫除阻挡研究成果被人阅读、使用和再使用的剩余障碍，对科研的未来至关重要。目前，正在进入一个扩展阶段，即从内容服务扩展到解决方案服务。