Despite greater attention being paid to sensitive-information leakage in the cyberdomain, the sensitive-information problem of the physical domain remains neglected. Anonymous users can easily access the sensitive information of other users, such as transaction information, health status, and addresses, without any advanced technologies. Ideally, secret messages should be protected not only in the cyberdomain but also in the complex physical domain. However, popular steganography schemes only work in the traditional cyberdomain and are useless when physical distortions of messages are unavoidable. This paper first defines the concept of cross-domain steganography, and then proposes EasyStego, a novel cross-domain steganography scheme. EasyStego is based on the use of QR barcodes as carriers; therefore, it is robust to physical distortions in the complex physical domain. Moreover, EasyStego has a large capacity for embeddable secrets and strong scalability in various scenarios. EasyStego uses an AES encryption algorithm to control the permissions of secret messages, which is more effective in reducing the possibility of sensitive-information leakage. Experiments show that EasyStego has perfect robustness and good efficiency. Compared with the best current steganography scheme based on barcodes, EasyStego has greater steganographic capacity and less impact on barcode data. In robustness tests, EasyStego successfully extracts secret messages at different angles and distances. In the case of adding natural textures and importing quantitative error bits, other related steganography techniques fail, whereas EasyStego can extract secret messages with a success rate of nearly 100%.
The research on the history of load and temperature to the influence of rock’s damage and fracture is rare. Commonly, it takes no account of the order of load and temperature and despite how the load’s history which arose its damage of thermal fracture is, the process of damage evolvement and the intensity of fracture is same as long as adds of carry is similar to temperature value. However, the thermal influenced by the history of adds of temperature and the result will be different under different order of adds of carry. This paper carries through meso-structure experiment of different order of adds of carry and temperature by the numbers, observe the process of limestone’s thermal crack damage under the different order of adds of temperature and carry on real time with instrument such as DaoJin High Temperature Fatigue Testing System with Scanning Electron Microscope. In the view of the rock’s tiny crack growth, compute its crack tip energy release rate under different order of adds of carry. The result of theory and experiment indicate that the fracture of rock’s thermal cracking are intensively influenced by the history of adds of carry.
Graphene-oxide based
fluorescent DNA aptasensors for the <i>in vivo </i>application remain a challenging task. We demonstrate for the first time such a nanomaterial for <i>in vivo</i> diagnosis and
therapy of liver tumor with good biocompatibility and high selectivity. This DNA nanomaterial
comprising of
DNA tetrahedron and aptamers, aggregation-induced emission luminogen (AIEgens)
and antitumor drug doxorubicin,
is fabricated and attached on
GO surface. Additionally, this GO-based fluorescent DNA nanodevice is
also constructed by using microfluidic chip for liver
tumor cell screening.
In thisexperiment, nanoCaCO3, nanoSiO2, nanoTiO2and nanoZnO were chosen and added into waterborne camouflage coating respectively to make nanomaterial camouflage coatings. Both the surface tension and the contact angle of the coating (on steel plate and on concrete blocks) were measured by the OCA15+ video optics contact angle admeasuring apparatus; the nanomaterials influence on the interfacial properties of camouflage coating were studied based on its changing concentration. The experiment indicates that the relationship between the concentration of nanomaterial and the surface tension of the coating coincides with the Szyszkowski formula, but only when the concentration is relatively low; nanoSiO2has the best effect in improving the interfacial properties of camouflage coatings. It also proves that adding proper nanomaterial is an efficient way to improve the coatings durability.
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