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Along with the economic development, the compulsory information disclosure of listed companies can not satisfy investors' diversified information needs. The society advances higher requirements for listed companies' information disclosure, which drives listed companies to disclose more information voluntarily. Recently, voluntary disclosure has gradually become a focus domestic and abroad because voluntary disclosure has positive impacts on the communication of corporate management agency and interests-related parties, the decrease of information asymmetry of investors, and the improvement of quality of disclosed information. On one hand, voluntary disclosure can detail and deepen compulsory disclosure, improving the credibility and completeness of compulsory disclosure. On the other hand, it can complement and expand the compulsory disclosure, for the sake of realizing the more complete, diversified, and systematic information disclosure. Therefore, the voluntary disclosure serves as an effective way for communicating interest-related parties and describing the corporate prospect. It is meaningful for perfecting listed companies' governance structure and enhancing the protection for investors' interests.Keywords: Information disclosure, Voluntary, Compulsory, Literature review The concept of information disclosure system and the evolvement of disclosure wayInformation disclosure is also named as information publicity. Information disclosure system means a series of behavioral regulations and activity standards for relevant parties in the securities market who publicize the information related with securities by certain way in the process of issuing stocks, listing on the market, and trading, according to laws, and rules of securities administrative agencies and stock exchanges. To ask companies that issue securities openly to execute the information disclosure system is the core content of modern securities market. It covers the whole process of securities' issue and circulation. Usually, before the issue of stocks, companies publicize stock-issuing introductions, listing announcements, interim reports, annual reports, and grave affair reports, mainly including companies' operations and financial statements.

a b s t r a c tThis paper presents a nonmonotone trust region algorithm for equality constrained optimization problems. Under certain conditions, we obtain not only the global convergence in the sense that every limit point is a stationary point but also the one step superlinear convergence rate. Numerical tests are also given to show the efficiency of the proposed algorithm.

With the development of digital technology, while digital publishing provide convenience for people to access to information it also influences the management mode of traditional copyrights and challenges current copyrights system. In this context, how to protect digital copyrights and promote the healthy development of digital publishing industry through the creation, management, protection and application of copyrights have become the common concerns to the fields of management, intellectual property and digital publishing industry.Keywords: Digital publishing, Copyright, DRM technology, Management system Currently the world publishing industry is facing a new technology revolution characterized by digitization. Digital publishing has permeated into every stage of publishing industry from the update of medium and process reengineering to the management of contents and the changes of reading methods and altered the means of production and concept of consumption of traditional publishing, which represents the trend of development and direction of press industry in 21 st century. Digital publishing technology, digital publishing printing, duplication and developing new media have been included in the focus points of national Science &Technology Innovation. Developing new cultural industry characterized by digital contents, digital production and network communication rapidly so as to realize the transformation from traditional publishing industry to digitalization has been a national strategy. The copyrights protection in the environment of digital publishing is urgent.The copyrights protection in the environment of digital publishing has become a common concern in the field of intellectual property protection over the world at present. There are some characteristics for digital publishing in the context of network communication as follows:1) The rapid increasing of kinds and numbers of copyright work, the continuous expanding of creation, dissemination and usage of copyright work and the application of digital technology and the popularity of the Internet make more people participate in the creation and disseminate their works to the public voluntarily. It is possible for each internet user to become the creator, disseminator and user of copyright works.2) The new problems of copyright protection in the environment of digital publishing appeared unceasingly and the contradiction is becoming more and more outstanding. The digital technique of network is moving forward everyday and the way to use internet is also constantly changing. The digital copyright protection is also facing new problems constantly.3) Due to the development of digital technology and in network, it is increasingly difficult to protect copyrights. With the increase of network bandwidth and the improvement of quality of transmission, it is easier to copy, disseminate and use others' works. Everyone will be accessed to the works as long as he clicks the mouse and then disseminates them out once again soon. Therefore, digital works is sub...

Herein, inorganic base K3PO4 promoted divergent synthesis of CF3-substituted allenes, cyclopentenes, alkynes, and fluorinated enynes via regioselective nucleophilic addition of carbon nucleophiles to 2-trifluoromethyl-1,3-enynes was developed. With the choice of different carbon nucleophiles, various fluorinated compounds could be obtained under K3PO4/DMF reaction system. When malononitriles were used as nucleophiles, CF3-substituted allenes, cyclopentenes, and alkynes could be obtained, respectively. By using 1,3-dicarbonyl compounds as nucleophiles, ring-monofluorinated 4H-pyrans could be prepared, and 1,1-difluoro-1,3-enynes could be furnished with the participation of diethyl malonate. Moreover, these five kinds of fluorinated allenes, alkenes, and enynes are valuable building blocks.