On February 19,2012,WalMart Stores,Inc.disclosed its additional investment in Yihaodian,a fast-growing electronic commerce website in China,making Walmart’s total ownership stake in Yihaodian to reach approximately 5...On February 19,2012,WalMart Stores,Inc.disclosed its additional investment in Yihaodian,a fast-growing electronic commerce website in China,making Walmart’s total ownership stake in Yihaodian to reach approximately 51%.It was Wal-Mart’s second investment for the purpose展开更多
According to Bloomberg on November 12, China Petrochemical Corp., Asia’s biggest ref iner, agreed to buy a 30 percent stake in Galp Energia SGPS SA (GALP)’s Brazilian unit, its second invest- ment in offshore oil fi...According to Bloomberg on November 12, China Petrochemical Corp., Asia’s biggest ref iner, agreed to buy a 30 percent stake in Galp Energia SGPS SA (GALP)’s Brazilian unit, its second invest- ment in offshore oil fields in Latin America’s largest economy in as many years.展开更多
BP,the UK energy group,is planning to sell one of its biggest Chinese investments,by disposing of its 50percent stake in the SECCO petrochemicals plant near Shanghai.BP is the latest western oil company to curtail act...BP,the UK energy group,is planning to sell one of its biggest Chinese investments,by disposing of its 50percent stake in the SECCO petrochemicals plant near Shanghai.BP is the latest western oil company to curtail activity in China,as energy groups reel from low crude and petrochemical prices.China’s slow liberalization展开更多
How Egypt can attempt to revert back to its former glory OPTIMISTS who entertained thoughts that Egypt would revert to its former state of peace and tranquility after parliamentary elections must have been badly jolte...How Egypt can attempt to revert back to its former glory OPTIMISTS who entertained thoughts that Egypt would revert to its former state of peace and tranquility after parliamentary elections must have been badly jolted in early February.This is when a fairly innocuous event,a football match between two traditionally rival teams,ended with the death of over 70 people.How a sporting event can lead to such sectarian-motivated carnage underpins the deep-seated animosities unleashed after the January 25,2011 revo-展开更多
先来看摘自一篇英语散文中的段落：地点哈瓦那,一个匈牙利人与倒卖雪茄的黑人烟贩子讨价还价。＂You’re crazy!＂cries the Hungarian in slightly accented English,taking one of the boxes from the trunk and waving it in Howard ...先来看摘自一篇英语散文中的段落：地点哈瓦那,一个匈牙利人与倒卖雪茄的黑人烟贩子讨价还价。＂You’re crazy!＂cries the Hungarian in slightly accented English,taking one of the boxes from the trunk and waving it in Howard Bingham’s face.＂These are Cohiba Esplendidos!The best in the world!You will pay one thousand dollars for a box like this in the States.＂展开更多
In the blockchain,the consensus mechanism plays a key role in maintaining the security and legitimation of contents recorded in the blocks.Various blockchain consensus mechanisms have been proposed.However,there is no...In the blockchain,the consensus mechanism plays a key role in maintaining the security and legitimation of contents recorded in the blocks.Various blockchain consensus mechanisms have been proposed.However,there is no technical analysis and comparison as a guideline to determine which type of consensus mechanism should be adopted in a specific scenario/application.To this end,this work investigates three mainstream consensus mechanisms in the blockchain,namely,Proof of Work(PoW),Proof of Stake(PoS),and Direct Acyclic Graph(DAG),and identifies their performances in terms of the average time to generate a new block,the confirmation delay,the Transaction Per Second(TPS)and the confirmation failure probability.The results show that the consensus process is affected by both network resource(computation power/coin age,buffer size)and network load conditions.In addition,it shows that PoW and PoS are more sensitive to the change of network resource while DAG is more sensitive to network load conditions.展开更多
An Ethereum blockchain based on proof of stake ( PoS) consensus mechanism is used to achieve the data sharing within the civil aviation service platform for both airport group management and passengers. Considering th...An Ethereum blockchain based on proof of stake ( PoS) consensus mechanism is used to achieve the data sharing within the civil aviation service platform for both airport group management and passengers. Considering the Gas consumption of Ethereum, the dynamic batch-service capacity constraint by the Block Gas Limit and the priority mechanism depending on the different Gas Price of transactions, M/ G/1 queuing theory with batch-service is used to construct the service model of transactions confirmation process in the proposed blockchain system, where the effects of transactions arrival rate, block capacity, service rate and number of nodes on the average confirmation time of transactions with different priority are analyzed, and eventually a performance analysis model of blockchain for civil aviation business data is proposed. The simulation results prove the usability and accuracy of the model, which can provide both theoretical basis for data sharing of civil aviation using Ethereum blockchain and the further optimization of transactions confirmation time.展开更多
E-commerce is becoming a focus for retailers and brand owners.China is expected to become the world’s largest retail market by 2018,though its retail’s growth rate is slowing,as revealed in a recent report by PwC.Ch...E-commerce is becoming a focus for retailers and brand owners.China is expected to become the world’s largest retail market by 2018,though its retail’s growth rate is slowing,as revealed in a recent report by PwC.China retail’s growth rate has fallen from a peak of 15.6%in 2009,yet China remains irresistible to global retail chains.China is still expected to achieve average annual retail volume growth of 8.7%in the next two years.展开更多
In October 2013,Chinese President Xi Jinping proposed to establish Asia Infrastructure Investment Bank during his meeting with Indonesia President Susilo.It is comprehensive and complex economic and political situatio...In October 2013,Chinese President Xi Jinping proposed to establish Asia Infrastructure Investment Bank during his meeting with Indonesia President Susilo.It is comprehensive and complex economic and political situations that helps to bring about the establishment of AⅡB.展开更多
文摘On February 19,2012,WalMart Stores,Inc.disclosed its additional investment in Yihaodian,a fast-growing electronic commerce website in China,making Walmart’s total ownership stake in Yihaodian to reach approximately 51%.It was Wal-Mart’s second investment for the purpose
文摘According to Bloomberg on November 12, China Petrochemical Corp., Asia’s biggest ref iner, agreed to buy a 30 percent stake in Galp Energia SGPS SA (GALP)’s Brazilian unit, its second invest- ment in offshore oil fields in Latin America’s largest economy in as many years.
文摘BP,the UK energy group,is planning to sell one of its biggest Chinese investments,by disposing of its 50percent stake in the SECCO petrochemicals plant near Shanghai.BP is the latest western oil company to curtail activity in China,as energy groups reel from low crude and petrochemical prices.China’s slow liberalization
文摘How Egypt can attempt to revert back to its former glory OPTIMISTS who entertained thoughts that Egypt would revert to its former state of peace and tranquility after parliamentary elections must have been badly jolted in early February.This is when a fairly innocuous event,a football match between two traditionally rival teams,ended with the death of over 70 people.How a sporting event can lead to such sectarian-motivated carnage underpins the deep-seated animosities unleashed after the January 25,2011 revo-
文摘先来看摘自一篇英语散文中的段落：地点哈瓦那,一个匈牙利人与倒卖雪茄的黑人烟贩子讨价还价。＂You’re crazy!＂cries the Hungarian in slightly accented English,taking one of the boxes from the trunk and waving it in Howard Bingham’s face.＂These are Cohiba Esplendidos!The best in the world!You will pay one thousand dollars for a box like this in the States.＂
基金the National Natural Science Foundation of China under Grant 61701059,Grant 61941114,and Grant 61831002,in part by the Fundamental Research Funds for the Central Universities of New TeachersProject,in part by the Chongqing Technological Innovation and Application Development Projects under Grant cstc2019jscx-msxm1322,and in part by the Eighteentg Open Foundation of State Key Lab of Integrated Services Networks of Xidian University under Grant ISN20-05.
文摘In the blockchain,the consensus mechanism plays a key role in maintaining the security and legitimation of contents recorded in the blocks.Various blockchain consensus mechanisms have been proposed.However,there is no technical analysis and comparison as a guideline to determine which type of consensus mechanism should be adopted in a specific scenario/application.To this end,this work investigates three mainstream consensus mechanisms in the blockchain,namely,Proof of Work(PoW),Proof of Stake(PoS),and Direct Acyclic Graph(DAG),and identifies their performances in terms of the average time to generate a new block,the confirmation delay,the Transaction Per Second(TPS)and the confirmation failure probability.The results show that the consensus process is affected by both network resource(computation power/coin age,buffer size)and network load conditions.In addition,it shows that PoW and PoS are more sensitive to the change of network resource while DAG is more sensitive to network load conditions.
基金the Open Foundation of Key Laboratory of Airports Cluster Intelligent Operation(No.KLACIO201900006124)National Natural Science Foundation of China(No.61901011)+1 种基金Foundation of Beijing Municipal Commission of Education(No.KM202010005017,KM202110005021)Beijing Natural Science Foundation(No.L192002).
文摘An Ethereum blockchain based on proof of stake ( PoS) consensus mechanism is used to achieve the data sharing within the civil aviation service platform for both airport group management and passengers. Considering the Gas consumption of Ethereum, the dynamic batch-service capacity constraint by the Block Gas Limit and the priority mechanism depending on the different Gas Price of transactions, M/ G/1 queuing theory with batch-service is used to construct the service model of transactions confirmation process in the proposed blockchain system, where the effects of transactions arrival rate, block capacity, service rate and number of nodes on the average confirmation time of transactions with different priority are analyzed, and eventually a performance analysis model of blockchain for civil aviation business data is proposed. The simulation results prove the usability and accuracy of the model, which can provide both theoretical basis for data sharing of civil aviation using Ethereum blockchain and the further optimization of transactions confirmation time.
文摘E-commerce is becoming a focus for retailers and brand owners.China is expected to become the world’s largest retail market by 2018,though its retail’s growth rate is slowing,as revealed in a recent report by PwC.China retail’s growth rate has fallen from a peak of 15.6%in 2009,yet China remains irresistible to global retail chains.China is still expected to achieve average annual retail volume growth of 8.7%in the next two years.
文摘In October 2013,Chinese President Xi Jinping proposed to establish Asia Infrastructure Investment Bank during his meeting with Indonesia President Susilo.It is comprehensive and complex economic and political situations that helps to bring about the establishment of AⅡB.
