Since the beginning of 60s of the 20th century the European Community has been voicing its concerns about the need for tax harmonization. First attitudes towards tax harmonization were very ambitious. The aim was not ...Since the beginning of 60s of the 20th century the European Community has been voicing its concerns about the need for tax harmonization. First attitudes towards tax harmonization were very ambitious. The aim was not only to reach structural harmonization in the Member States, but also harmonization of tax base and tax rates. The article explores the nature and conditions of the harmonization process while addressing its legislative modifications. The article analyses and compares the most important indirect taxes (value added tax, excise duties) in the Member States of the EU. Despite decades of efforts to harmonize taxes countries continuously apply national taxes. Heads of the Union argue that this approach can lead to disintegration in the future.展开更多
The increase in natural gas reserves makes methane a significant hydrocarbon feedstock. However, thedirect catalytic conversion of methane into liquid fuels and useful chemicals remains a great challenge,and many stud...The increase in natural gas reserves makes methane a significant hydrocarbon feedstock. However, thedirect catalytic conversion of methane into liquid fuels and useful chemicals remains a great challenge,and many studies have been devoted to this field in the past decades. Electrocatalysis is considered asan important alternative approach for the direct conversion of methane into value-added chemicals, al-though many other innovative methods have been developed. This review highlights recent advances inelectrocatalytic conversion of methane to ethylene and methanol, two important chemicals. The electro-catalytic systems efficient for methane conversions are summarized with an emphasis on catalysts andelectrolytes. The effects of reaction conditions such as the temperature and the acid-base property of thereaction medium are also discussed,展开更多
文摘Since the beginning of 60s of the 20th century the European Community has been voicing its concerns about the need for tax harmonization. First attitudes towards tax harmonization were very ambitious. The aim was not only to reach structural harmonization in the Member States, but also harmonization of tax base and tax rates. The article explores the nature and conditions of the harmonization process while addressing its legislative modifications. The article analyses and compares the most important indirect taxes (value added tax, excise duties) in the Member States of the EU. Despite decades of efforts to harmonize taxes countries continuously apply national taxes. Heads of the Union argue that this approach can lead to disintegration in the future.
基金supported by the SINOPEC(No.415069)the National Natural Science Foundation of China (Nos.21690082,91545203 and 21503176)
文摘The increase in natural gas reserves makes methane a significant hydrocarbon feedstock. However, thedirect catalytic conversion of methane into liquid fuels and useful chemicals remains a great challenge,and many studies have been devoted to this field in the past decades. Electrocatalysis is considered asan important alternative approach for the direct conversion of methane into value-added chemicals, al-though many other innovative methods have been developed. This review highlights recent advances inelectrocatalytic conversion of methane to ethylene and methanol, two important chemicals. The electro-catalytic systems efficient for methane conversions are summarized with an emphasis on catalysts andelectrolytes. The effects of reaction conditions such as the temperature and the acid-base property of thereaction medium are also discussed,