publicly verifiable zero-knowledge watermark detection

对称水印方案的水印检测密钥可以被用来伪造和移去水印，因此要求它在检测过程中也是保密的．零知识的水印检测方案利用密码学中零知识和知识证明的思想和算法，实现在水印检测时使得验证者确信水印存在性的同时又不泄漏水印检测密钥．提出了公开可验证的零知识水印检测的安全需求，给出一个公开可验证的承诺方案和一个证明知道被承诺值的离散对数的零知识知识证明协议．在此基础上提出了一个公开可验证的零知识水印方案，并讨论了它的安全性

长江三峡库区气候变化影响评估报告

本书是由中国气象局气候中心组织20余位在长江三峡库区研究中具有气候变化及影响研究丰富理论和实践经验的专家，经过大量资料收集、总结归纳以及作者现有研究成果撰写而成。位于长江上游的三峡库区，因其特殊的自然地理位置，深入探索气候变化对其各方面的影响，有助于积极适应和减缓气候变化，保证三峡工程安全运行，对保障三峡库区的可持续发展有重要意义。全书共分八章，在阐述三峡库区气候变化事实的基础上，分析气候变化对库区水资源、农业、自然生态系统、人体健康、电力、航运、旅游等方面的影响、脆弱性和适应性，并因地制宜地提出适应与减缓对策，为全球气候变化背景下三峡库区社会经济的可持续发展提供理论依据和科技支撑。本书是我国关于流域气候变化研究系列评估报告中的一本。本书可供中央部委和流域机构以及地方政府决策参考，亦可作为气候气象、水文水资源、生态与环境、社会经济等领域的科研人员和有关大专院校师生的参考书目

COMPARISON OF THE PREDOMINANT BACTERIAL COMMUNITY STRUCTURE IN THE GASTROINTESTINAL WALL BETWEEN LUTJANUS SEBAE AND EPHIPPUS ORBIS BASED ON 16S rDNA PCR-DGGE FINGERPRINT

本文采用免培养的16S rDNA梯度凝胶电泳技术(DGGE)对集约化海水网箱养殖川纹笛鲷Lutjanus sebae及圆白鲳Ephippus orbis消化道壁优势菌群结构进行了比较分析。研究结果显示川纹笛鲷及圆白鲳消化道壁存在着大量细菌群落,对DGGE指纹图谱聚类分析表明两种鱼肠道壁及胃壁菌群组成相似度高于50%,其中二者肠道壁细菌组成相似性最高(67%),这些可能与两种鱼养殖在同一水域、摄食相同饵料相关,另外通过软件对DGGE指纹带谱相对丰度分析表明同种鱼肠道壁及胃壁具有相同最大优势菌群。同时,两种鱼消化道壁之间在细菌多样性及相对丰度上亦存在明显区别,圆白鲳消化道壁细菌多样性要高于川纹笛鲷,这可能归因于川纹笛鲷与圆白鲳在天然环境中栖息地的差异性。本研究通过首次建立不同海水鱼消化道壁16S rDNA-DGGE指纹图谱及比较分析,为澄清海水鱼消化道壁微生物区系奠定基础。The comparison of the predominant bacterial community structure in the gastrointestinal walls between Lutjanus sebae(Cuvier,1816) and Ephippus orbis(Bloch,1787) based on 16S rDNA PCR-DGGE fingerprint using a culture-independent method was conducted in the paper.The results showed that abundant bacterium were planted in the gastrointestinal walls of both marine finfish species,the similarity was above 50% in the community structures in the gastrointestinal walls with the highest similarity of 67% in the bacterial composition between the intestinal wall of Lutjanus sebae and that of Ephippus orbis,and the walls of the stomach and the intestinal in one fish shared the same most predominant bacteria species,which might reflect the same aquaculture environment and the diet fed for both finfish species.However,the difference of the richness and relative abundance in the bacterium of the gastrointestinal walls in both finfish species was also observed from the DGGE fingerprint with the results of richer bacterium of the gastrointestinal wall in Ephippus orbis compared to that in Lutjanus sebae,which might due to the different natural living habits.The first time of the establishment and comparison of the 16S rDNA-DGGE fingerprint in the gastrointestinal wall of marine finfish in present study do help to elucidate the microflora structure in the gastrointestinal wall of marine finfish.国际科技合作重点项目计划(2004DF100229);; 中国博士后科学基金(2005037625);; 广东省自然科学基金(05300945)资

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel