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Transboundary water pollution management is a challenge for China at this moment in time. By introducing relevant legal arrangements, we mainly discuss the competent authorities, the legal instruments and dispute settlement procedures concerning this issue in China. The experiences from international, EU and Dutch water law gives us a comparative perspective. As a conclusion, we agree that China has set up a basic legal system to solve the problem, but a greater effort can still be made, for instance including more public opinion, clearly defining the competent authorities, and enacting more legislation. At the same time, the Chinese experience, such as a new model for a monitoring system and a target responsibility system, also provides the rest of the world with a new approach.

Transboundary water pollution management is a challenge for China at this moment in time. By introducing relevant legal arrangements, we mainly discuss the competent authorities, the legal instruments and dispute settlement procedures concerning this issue in China. The experiences from international, EU and Dutch water law gives us a comparative perspective. As a conclusion, we agree that China has set up a basic legal system to solve the problem, but a greater effort can still be made, for instance including more public opinion, clearly defining the competent authorities, and enacting more legislation. At the same time, the Chinese experience, such as a new model for a monitoring system and a target responsibility system, also provides the rest of the world with a new approach.

In recent years, reversible data hiding (RDH) has become a research hotspot in the field of multimedia security that has aroused more and more researchers&rsquo ; attention. Most of the existing RDH algorithms are aiming at continuous-tone images. For RDH in encrypted halftone images (RDH-EH), the original cover image cannot be recovered losslessly after the watermark is extracted. For some application scenarios such as medical or military images sharing, reversibility is critical. In this paper, a reversible data hiding scheme in encrypted color halftone images (RDH-ECH) is proposed. In the watermark embedding procedure, the cover image is copied into two identical images to increase redundancy. We use wet paper code to embed the watermark into the image blocks. Thus, the receiver only needs to process the image blocks by the check matrices in order to extract the watermarks. To increase embedding capacity, we embed three layers in the embedding procedure and combine the resulting images into one image for convenience of transmission. From the experimental results, it can be concluded that the original image can be restored entirely after the watermarks are extracted. Besides, for marked color halftone images, our algorithm can implement high embedding capacity and moderate visual quality.

In this paper, I deal with Heidegger's evolving account of metaphysics, since Heidegger's persistent concern, the question of being, is a basic metaphysical question. To date, most Heidegger scholars have focused only on a particular stage of Heidegger's philosophy: either his early attempt to deconstruct metaphysics, or his efforts to overcome metaphysics in the 1930s, or his late embrace of 'releasement' from metaphysics. However, these limited approaches fail to address Heidegger's different understandings of metaphysics, which lie at the root of his changing approaches to the question of being. They also fail to explain whether there is any inner connection between the various approaches. Further, given Heidegger's unremittingly negative attitude towards metaphysics, some scholars have even maintained that Heidegger thought it both possible and desirable to leave metaphysics behind altogether. I address these issues first by arguing that metaphysics for Heidegger has three interconnected meanings: initially it is the representation of the totality of things that are present-at-hand, a view subsequently developed into subjective representational thinking, and finally radicalized into an expression of the will to power. At each stage, Heidegger critiques the metaphysical tradition but never claims that it can be fully eliminated, since it is a mode of Dasein's being and ultimately possiblized by being itself. For this reason, Heidegger's own philosophy of being remains inseparable from metaphysics.