As a zero-or near zero-emission energy carrier,hydrogen,especially"green hydrogen"from renewable energy and water,is the key piece for decarbonizing existing energy systems and transiting into a carbon-neutr...As a zero-or near zero-emission energy carrier,hydrogen,especially"green hydrogen"from renewable energy and water,is the key piece for decarbonizing existing energy systems and transiting into a carbon-neutral world[1,2].Unfortunately,challenges associated with storage and transportation greatly restrict the large-scale application of hydrogen energy,which requires the development of efficient hydrogen storage materials[3-5].Among the various proposed candidates,ammonia(NH_(3))is regarded as a promising hydrogen carrier owing to its low carbon footprint,high gravimetric/volumetric hydrogen storage capacity,easy liquidation,safe storage and transportation,and well-developed synthesis approach at the industrial scale[6-8].展开更多
18-19世纪的欧洲,"民族原则"(principle of nationalities)已然成为最有力的政治思想之一。按照这一原则,每个民族(nationality)都应该有自己的国家,因此每个民族都应该把自己同一个国家联系在一起,另一方面,也应该充分地组...18-19世纪的欧洲,"民族原则"(principle of nationalities)已然成为最有力的政治思想之一。按照这一原则,每个民族(nationality)都应该有自己的国家,因此每个民族都应该把自己同一个国家联系在一起,另一方面,也应该充分地组成一个国家。然而,马克思主义经典作家的相关论述表明,"每一个民族都应构建自己的国家"的假设搅乱了欧洲大陆,引起大国间的纵横捭阖,进而导致各国边界的变迁:无论是法国的"自然疆界论",德国的"中欧大国论",抑或俄国的"泛斯拉夫主义",均以维护"民族原则"为口号,用以体面地掩盖自身的大国领土、疆界扩张政策。从实际情况来看,正如恩格斯所批判的那样,新建立的国家仅仅在理论上是一个单一民族国家,事实上,他们和欧洲历史上的君主制一样,都是多民族的。展开更多
文摘As a zero-or near zero-emission energy carrier,hydrogen,especially"green hydrogen"from renewable energy and water,is the key piece for decarbonizing existing energy systems and transiting into a carbon-neutral world[1,2].Unfortunately,challenges associated with storage and transportation greatly restrict the large-scale application of hydrogen energy,which requires the development of efficient hydrogen storage materials[3-5].Among the various proposed candidates,ammonia(NH_(3))is regarded as a promising hydrogen carrier owing to its low carbon footprint,high gravimetric/volumetric hydrogen storage capacity,easy liquidation,safe storage and transportation,and well-developed synthesis approach at the industrial scale[6-8].
文摘18-19世纪的欧洲,"民族原则"(principle of nationalities)已然成为最有力的政治思想之一。按照这一原则,每个民族(nationality)都应该有自己的国家,因此每个民族都应该把自己同一个国家联系在一起,另一方面,也应该充分地组成一个国家。然而,马克思主义经典作家的相关论述表明,"每一个民族都应构建自己的国家"的假设搅乱了欧洲大陆,引起大国间的纵横捭阖,进而导致各国边界的变迁:无论是法国的"自然疆界论",德国的"中欧大国论",抑或俄国的"泛斯拉夫主义",均以维护"民族原则"为口号,用以体面地掩盖自身的大国领土、疆界扩张政策。从实际情况来看,正如恩格斯所批判的那样,新建立的国家仅仅在理论上是一个单一民族国家,事实上,他们和欧洲历史上的君主制一样,都是多民族的。
