High Capacity Data Hiding in Encrypted Image Based on Compressive Sensing for Nonequivalent Resources

To fulfill the requirements of data security in environments with nonequivalent resources,a high capacity data hiding scheme in encrypted image based on compressive sensing(CS)is proposed by fully utilizing the adaptability of CS to nonequivalent resources.The original image is divided into two parts:one part is encrypted with traditional stream cipher;the other part is turned to the prediction error and then encrypted based on CS to vacate room simultaneously.The collected non-image data is firstly encrypted with simple stream cipher.For data security management,the encrypted non-image data is then embedded into the encrypted image,and the scrambling operation is used to further improve security.Finally,the original image and non-image data can be separably recovered and extracted according to the request from the valid users with different access rights.Experimental results demonstrate that the proposed scheme outperforms other data hiding methods based on CS,and is more suitable for nonequivalent resources.

Lie Point Symmetry Algebras and Finite Transformation Groups of Baroclinic Mode for Rotating Stratified Flows

The transformation groups and symmetries of the baroclinic mode for rotating stratified flow can be obtained via the standard approach. Applying the symmetry group on some special solutions, the newly obtained results disprove a known conjecture.

Crystal Structure of Diethyl 1-(p-toluenesulfonamido)-p-chlorophenylmethylphosphonate

The crystal and molecular structure of diethyl l-(p-toluenesulfon-amido ) - p chlofoPhenylmet hylphosphonate has been determined by X- ray d iffractionmethod- The crystal (C18,H23,ClNO5PS) is monoclinic with space group P21/c, a =8. 162(6), b= l8. O64(7), c= l4. 362(4) A, β=96. 29(3)°, V=2lO4. 7 A3, M.=431, 88, Z=4, Dx= l. 364 g/cm3, μ, = 3. 765 cm-1, F(000) = 904, R=0. 047 andRw=0. 0049 for 998 reflections with I>3σ(I). The 1H NMR spetrum of the title com-pound shows that the two ethoxy groups are magnetic nonequivalent, which is in agree-ment with its X-ray analysis result-

Crystal Structure of O,O'-Diphenyl N-(o-methylphenyl)-P-toluenesulfonamidomethylphosphonate

The 1H NMR spectrum of the title compound shows that the two hydrogen atoms at a-C are magnetic nonequivalence. To explain the nonequivalence phenomenon, the crystal and molecular structure of the title compound has been determined by X-ray diffraction methed. The crystal (C27H26NO5PS) is monoclinic withspace group P21/c, a = 11. 310(4), b =20. 692(5), c =11. 826(4) A, β =112. 46(3)°， V = 2256(1) A3, Mr- 507. 55, Z = 4, Dx= 1. 319g/cm3, μ= 2. 179cm-1,F(000) =1064, R = 0. 054 and Rw= 0. 064 for 2405 renections with I≥>3δ(I). TheX-ray diffraction analysis reveals that the two hydrogen atoms at a-C are located at differeat magnetic environments, which can explain the nonequivalence phenomnon in 1HNMR spetrum.

Synthesis of 0,0-diethyl-α-(p-toluenesulphonamido) phosphonates by Mannich-type reaction

<正> A series of O,O-diethyl-α-（p-toluenesulphonamido）phosphonates have been synthesized by theMannich-type reaction of p-toluenesulphonamide,substituted benzaldehydes and diethyl phosphite with acetylchloride as the solvent.The mechanism of the reaction is suggested,and the structures of new products areconfirmed by1H NMR,31p NMR,elemental analysis and X-ray diffraction.The results of preliminarybioassay showed that some of them possess herbicidal activities.