ROI-based Watermarking Scheme for JPEG 2000

A new region of interest (ROI)-based watermarking method for JPEG 2000 is presented. The watermark is embedded into the host image based on the characteristics of the ROI to protect rights to the images. This scheme integrates the watermarking process with JPEG 2000 compression procedures. Experimental results have demonstrated that the proposed watermark technique successfully survives JPEG 2000 compression, progressive transmission, and principal attacks.     

保护机密文件,007系列并不精彩的故事

故事背景能够拍成电影、搬上荧幕的,都是詹姆斯·邦德最风光的功劳,其实007一年到头来并不总是如此风光,比如这个最新接到的任务。根据中情局的最新情报,来自欧洲某大国R国的间谍已经瞄准了代号为"XPS"的高度机密资料。而邦德接到的任务是保护此机密文件。     

Plasma properties of laser-ablated St target in air

Ｐｌａｓｍａｐｒｏｐｅｒｔｉｅｓｏｆｌａｓｅｒ－ａｂｌａｔｅｄＳｔｔａｒｇｅｔｉｎａｉｒＷａｎｇＸｉａｎｇ－Ｔａｉ（王象泰）；ＭａｎＢａｏ－Ｙｕａｎ（满宝元）；ＷａｎｇＧｏｎｇ－Ｔａｎｇ（王公堂）；ＦａｎＸｉ－Ｊｕｎ（樊锡君）；ＷａｎｇＪｕｎ（王军）...     

一幅画

从吃饱到吃好、吃精至吃的环境,人们对生活的要求逐渐趋向艺术化,餐馆老板会把环境设计与经营放在同等地位,所以好的餐饮空间层出不穷,也是社会发展的必然产物。位于宁波老外滩的瀚珍舫餐馆,建筑一层的面积较小,二、三层呈狭长形,做为餐馆这样的建筑条件并不理想,设计师把包厢和雅座设置在两边,这样走廊显得更幽深,柱子阵列得更有气势。拆除原先的楼梯,做了一部上下错位且不规则楼梯,曲折向上,增强了空间的层次。通顶的储酒柜,从三楼悬下的八米长吊灯,把一至三楼不落痕迹地融为一体。要设计一个好作品,设计师的构想需要不停地游走。碰撞的激情仿佛是一幅画,渐渐地,它的轮廓清晰了,色彩明朗了,它的主题神秘而遥不可及,每个人的心扉都有不同的暗香飘逸。掩映在现代手法中的精致、深沉从骨子里透出古典优雅     

Self-aligned diffusion technique for n-InP JFETs

A self-aligned diffusion process has been demonstrated in the fabrication of n-InP JFETs on semi-insulating InP. This process utilises the anisotropic and selective etching properties of InP/GaInAs materials. Using this technique, sub-micrometre gate lengths can be achieved even with conventional photolithography. Devices with trans-conductance of >35mS/mm, leakage current of < 10nA/mm and gate capacitance of <0.7pF/mm have been fabricated with a cutoff frequency of 7 GHz.     

A simplified dispersion limit formula for IM/DD systems and itscomparison with experimental results

A simplified formula for the dispersion limit of single-mode-fiber intensity modulation/direct detection (IM/DD) systems is derived for arbitrary given normalized pulse width U, eye opening penalty X and source linewidth enhancement factor α. From the comparison with published theoretical analyses, computer simulation and experimental data, its validity and the limits of existing formulae are shown. Using this simple and general formula, one can easily obtain the dispersion limit of various fiber types under different working conditions in IM/DD systems     

磷酸异戊酯萃取U,Np,Pu性能的研究

测定磷酸异戊酯（ＴｉＡＰ）对Ｕ（Ⅵ）、Ｎｐ（Ⅳ）、Ｎｐ（Ⅴ）、Ｎｐ（Ⅵ）、Ｐｕ（Ⅳ）和Ｐｕ（Ⅲ）的萃取性能及对Ｔｈ（代替Ｐｕ）的萃取容量。研究了二乙三胺五乙酸（ＤＴＰＡ）络合剂对上述核素形成配合物的条件。结果表明，在用ＴＢＰ和ＴｉＡＰ作萃取剂时，可用ＤＴＰＡ络合Ｎｐ（Ⅵ）、Ｐｕ（Ⅲ）．从而改善乏燃料后处理中Ｕ产品对Ｎｐ、Ｐｕ和Ｐｕ产品对Ｎｐ的去污。     

从光合作用的倒掉说起

席殊书屋、第三级书局走了,风入松、纸老虎世纪城店关了,我没太在意。2010年10月底,有着36家连锁店的光合作用竟然也宣告倒闭了!我终于淡定不起来了。清华大学出版社零售产品经理王川（简称川）清华大学出版社图书编辑刘青（简称刘）记者Justdo（简称J）新华书店＋网购是必然趋势J：光合作用倒闭了,你们惊讶吗？刘：其实我挺惊讶,因为我常去,特别是五道口那家店,从刚开业起就经常去逛。     

Incorporating Actor-Critic in Monte Carlo tree search for symbolic regression

Neural Computing and Applications - Most traditional genetic programming methods that handle symbolic regression are random algorithms without memory and direction. They repeatedly search for the...     

Effect of nitrogen and nickel on the stability of an Fe-12Cr-23Mn austenitic steel

The effect of nitrogen and nickel on the austenite stability and the structural changes as a result of cold work of an Fe-12Cr-23Mn alloy steel has been examined by transmission electron microscopy and X-ray analysis. Prestrain was performed either at room temperature or at 200° C. Final strain was carried out at liquid nitrogen temperature. The volume fraction of strain-induced martensite decreased by 40% and 12% due to the addition of 2.43% Ni and 0.11% N, respectively, despite whether prestrain was performed or not. The mechanisms are discussed in terms of the phase, stacking faults, dislocation cells and dislocation tangles induced by prestrain and final strain.