Based on sidechain relay strategy, a cross-chain platform BitXhub-PI is implemented to realize the interoperability between the heterogeneous blockchains for electric power industry. The platform is composed of three roles: relay chain, application chain and cross-chain pier, and it has three core functional characteristics of universal cross-chain transmission protocol, heterogeneous transaction verification engine, and multi-level routing to ensure the security, flexibility and reliability of cross-chain transactions of electricity business. The platform provides a unified cross-chain contract template for homogeneous and heterogeneous electricity application chains, and the relay chain contains a dynamically upgradeable verification engine. The experiments show that the platform guarantees asynchronous distributed electricity business transactions between heterogeneous blockchains, achieving high performance with high throughput, low latency, high scalability, and low overhead.
With the considerable exploration of blockchain in various industrial fields, the storage architectures of mainstream consortium blockchains exhibit significant performance limitations, which can't meet the requirements of efficient data access with massive data storage in enterprise-level business scenarios. In this paper, we creatively divided the underlying data of the consortium blockchain into two categories: continuous data and state data and proposed a new storage architecture to store and operate these two types of data efficiently. For continuous data, we designed a specialized index-based storage engine. For state data, we proposed a multi-level cache mechanism with a secure and integrated data persistence policy. In addition, a pluggable Client/Server mode is employed to achieve flexible distributed extension. A series of experiments are conducted to show the effectiveness of our architecture. Compared with mainstream consortium blockchain storage architecture based on LevelDB, the average time-consuming decreases 81.85%/82.47% for reading/writing continuous data and 22.21%/48.99% for reading/writing state data. Compared with the storage architecture based on distributed database TiKV, the time-consuming decreases more significantly. This storage architecture has been integrated into the enterprise-level consortium blockchain platform Hyperchain, which has supported the efficient running of dozens of large-scale commercial blockchain projects with massive data.
To quantitatively analyse the impacts of the COVID-19 pandemic on China’s container ports, the berthing ships are mainly investigated by the big data of Automatic Identification System (AIS). First, the methods of AIS data acquisition, cleaning and statistical analysis are introduced. Then the sample ports of Shanghai, Ningbo-Zhoushan and Tianjin are selected, and the monthly ratios of key indicators such as the number of berthing ships and berthing time are calculated by AIS analysis system. Finally, the numerical results show that although the COVID-19 epidemic does not significantly affect the number of container ships arriving at China’s ports, it has a significant impact on the average berthing time of container ships.
Abstract-Along with the expansion of international higher education in China, the English teaching for foreign students has become the important way for foreign students education. This paper introduces teaching practices of Analog Circuit with English for foreign students, and discusses the teaching methods, the teachers' team building and the evaluation of teaching.Teaching practice shows that the learning interest of students and the teaching effects are improved greatly after the teaching reform.
BLOCKCHAIN IS EXPLODING in popularity because of a disruptive fusion of peer-to-peer communication, distributed storage, cryptographic algorithms, and smart contracts. It has become a new paradigm of building trustful distributed systems by providing reliable data service for untrusted parties.As a trustful distributed system, blockchain has multiple advantages, including immutability, transparency, auditability, and tamper resistance. Any participant can view the complete block and trace each state's transitions. With the security guarantee inherited from the chain-like structure and the consensus mechanism, blockchain records are resistant to malicious forgeries. 17 With its unique characteristics, blockchain offers strong potential for reestablishing public confidence and enabling reliable information sharing and value transfer. The profound implications of blockchain allow new ways of economic cooperation and have influence over social infrastructure. It is quickly becoming a crucial strategic deployment globally. In the future, blockchain may become a new infrastructure to provide credible and essential data services for enterprises and the public. China's Perspectives on BlockchainChina underscores the critical role of blockchain technology in the new round of technological innovation and industrial transformation. However, different from other countries, China has its perspectives on the rise of the worldwide blockchain landscape: embracing the blockchain technology while resisting illegal financial activities related to coinoffering fundraising and trading or "virtual currencies." 3,18 Blockchain in China
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