Based on the definition of MQ-B-Splines,this article constructs five types of univariate quasi-interpolants to non-uniformly distributed data. The error estimates and the shape-preserving properties are shown in detai...Based on the definition of MQ-B-Splines,this article constructs five types of univariate quasi-interpolants to non-uniformly distributed data. The error estimates and the shape-preserving properties are shown in details.And examples are shown to demonstrate the capacity of the quasi-interpolants for curve representation.展开更多
MIMO-DFE(Multiple-Input-Multiple-Output Decision Feedback Equalizer) based receiver architectures are researched recently to detect signals in BLAST(Bell laboratories LAyered Space-Time) over frequency-selective chann...MIMO-DFE(Multiple-Input-Multiple-Output Decision Feedback Equalizer) based receiver architectures are researched recently to detect signals in BLAST(Bell laboratories LAyered Space-Time) over frequency-selective channels. Due to their recursive structure, these receivers may suffer from error propagation which results in an overall mean square error degradation. An MIMO-DFE based BLAST receiver with limited error propagation to combat frequencyselective channel is proposed, which employs both norm constraint on feedback filter taps and soft decision device. Simulation results show that the proposed receiver outperforms conventional ones in various frequency selective channels.展开更多
By using the non parametric least square method, the strong consistent estimations of distribution function and failure function are established,where the distribution function F(x) after logist transformation is...By using the non parametric least square method, the strong consistent estimations of distribution function and failure function are established,where the distribution function F(x) after logist transformation is assumed to be approximated by a polynomial.The performance of simulation shows that the estimations are highly satisfactory.展开更多
The title compound 〔(PPh 3)(CH 3COS) 2NiB 10 H 10 〕·0.4(C 5H 12 ) has been synthesized by the reaction of 〔NiCl 2(PPh 3) 2〕, closo 〔B 10 H 10 〕 2- and CH 3COSH in CH 2Cl 2 solution. It was recrystallized fr...The title compound 〔(PPh 3)(CH 3COS) 2NiB 10 H 10 〕·0.4(C 5H 12 ) has been synthesized by the reaction of 〔NiCl 2(PPh 3) 2〕, closo 〔B 10 H 10 〕 2- and CH 3COSH in CH 2Cl 2 solution. It was recrystallized from n pentane/CH 2Cl 2 solution and its structure was determined by X ray diffraction analysis. The crystal is triclinic, space group P1, M r= 618.23, with a=10.049(1), b=12.638(2), c=14.077(2) , α=110.13(1), β=87.65(1), γ=96.01(1)°, V=1669.3(4) 3, D c =1.230 g/cm 3, Z=2, λ (Mo Kα )=0.71073 , μ =7.76 cm -1 , F (000)=642. The final refinement is converged with R =0.042 (5986 observed reflections with I≥2σ(I)), wR 2 =0.151. The cluster is a nido eleven vertex {NiB 10 } cage with the Ni atom in the open NiB 4 face. Cyclizations resulting in two five membered rings, Ni(7)-S(1)-C(1)-O(1)-B(2) and Ni(7)-S(2)-C(2)-O(2)-B(3), have occurred.展开更多
The title compound has been synthesized by the reaction of 〔RuCl 2(PPh 3) 3〕 and closo 〔B 10 H 10 〕 2- in (CH 3) 2CHOH solution. Crystals suitable for a single crystal X ray diffraction ana...The title compound has been synthesized by the reaction of 〔RuCl 2(PPh 3) 3〕 and closo 〔B 10 H 10 〕 2- in (CH 3) 2CHOH solution. Crystals suitable for a single crystal X ray diffraction analysis were obtained from n pentane diffused to CH 2Cl 2 solution. The crystal {(PPh 3) 2ClRu( μ Cl)Ru(PPh 3)B 10 H 7〔OCH(CH 3) 2〕 3}·0.4(H 2O) is monoclinic , space group P2 1/n , M r= 1359.47, with a=19.434(4), b =14.340(4), c=25.865(9) , β= 95.48(3)°, V=7175(4) 3, D c =1.258 g/cm 3, Z=4, λ (Mo Kα )=0.71073, μ=6.03 cm -1 , F(000)=2784, R=0.0631, wR 2 = 0.1425, S =1.001. The title compound is a bimetallic species in which the second ruthenium center is bound to the cluster {(PPh 3)RuB 10 H 7〔OCH(CH 3) 2〕 3} via an Ru-Cl-Ru and two Ru-H-B-Ru bridges. The third isoproxy group replaces a hydrogen atom on B(10) of the cage, which indicates the activity of the cage.展开更多
(NH4)11[Na(H2O)2P4W14O58)·12H2O, Mr = 4099. 39, triclinic, space group P1, a = 14. 376(2), b = 19.861(9), c=13. 010(3)(?) , α=104. 68(2), β=91. 37(1), γ= 104. 05(2)°, V = 3471. 1 (?)3, Z = 2, Dc=3. 922g/c...(NH4)11[Na(H2O)2P4W14O58)·12H2O, Mr = 4099. 39, triclinic, space group P1, a = 14. 376(2), b = 19.861(9), c=13. 010(3)(?) , α=104. 68(2), β=91. 37(1), γ= 104. 05(2)°, V = 3471. 1 (?)3, Z = 2, Dc=3. 922g/cm3, μ (MoKα) = 238. 274cm-1, F(000) = 3664, R = 0.0510, Rw = 0. 0665 for 9260 observed reflections with I> 3σ(I). The polyanion [Na(H2O)2P4W14O58]11- consists of two PW7O29 subunits anisostructurally, two linkage phosphorous atoms and one sodium ion with two water ligands as well. The geometries of tungsten atoms within these two subunits are almost the same as those in K12P4W14O58· 21H2O[2]. The four phosphorous atoms are in PO4 coordinations. The sodium ion locates nearly at the center of the polyanion, and is coordinated by two water molecules, five oxygen atoms of the anion and one phosphorous atom with Na-P = 3. 053(3) (?). Due to the presence of the sodium atom, the interactions between oxygen and tungsten atoms in the polyanion are somewhat weakened.展开更多
In the paper, a new mixed algorithm combined with schemes of nonmonotone line search, the systems of linear equations for higher order modification and sequential quadratic programming for constrained optimizations is...In the paper, a new mixed algorithm combined with schemes of nonmonotone line search, the systems of linear equations for higher order modification and sequential quadratic programming for constrained optimizations is presented. Under some weaker assumptions,without strict complementary condition, the algorithm is globally and superlinearly convergent.展开更多
基金Supported by the National Natural Science Foundation of China( 1 9971 0 1 7,1 0 1 2 5 1 0 2 )
文摘Based on the definition of MQ-B-Splines,this article constructs five types of univariate quasi-interpolants to non-uniformly distributed data. The error estimates and the shape-preserving properties are shown in details.And examples are shown to demonstrate the capacity of the quasi-interpolants for curve representation.
文摘MIMO-DFE(Multiple-Input-Multiple-Output Decision Feedback Equalizer) based receiver architectures are researched recently to detect signals in BLAST(Bell laboratories LAyered Space-Time) over frequency-selective channels. Due to their recursive structure, these receivers may suffer from error propagation which results in an overall mean square error degradation. An MIMO-DFE based BLAST receiver with limited error propagation to combat frequencyselective channel is proposed, which employs both norm constraint on feedback filter taps and soft decision device. Simulation results show that the proposed receiver outperforms conventional ones in various frequency selective channels.
基金Fundan- Switzerland Reinsurance Fund and the National NaturalScience Foundation of China(1 0 1 71 0 79)
文摘By using the non parametric least square method, the strong consistent estimations of distribution function and failure function are established,where the distribution function F(x) after logist transformation is assumed to be approximated by a polynomial.The performance of simulation shows that the estimations are highly satisfactory.
文摘The title compound 〔(PPh 3)(CH 3COS) 2NiB 10 H 10 〕·0.4(C 5H 12 ) has been synthesized by the reaction of 〔NiCl 2(PPh 3) 2〕, closo 〔B 10 H 10 〕 2- and CH 3COSH in CH 2Cl 2 solution. It was recrystallized from n pentane/CH 2Cl 2 solution and its structure was determined by X ray diffraction analysis. The crystal is triclinic, space group P1, M r= 618.23, with a=10.049(1), b=12.638(2), c=14.077(2) , α=110.13(1), β=87.65(1), γ=96.01(1)°, V=1669.3(4) 3, D c =1.230 g/cm 3, Z=2, λ (Mo Kα )=0.71073 , μ =7.76 cm -1 , F (000)=642. The final refinement is converged with R =0.042 (5986 observed reflections with I≥2σ(I)), wR 2 =0.151. The cluster is a nido eleven vertex {NiB 10 } cage with the Ni atom in the open NiB 4 face. Cyclizations resulting in two five membered rings, Ni(7)-S(1)-C(1)-O(1)-B(2) and Ni(7)-S(2)-C(2)-O(2)-B(3), have occurred.
文摘The title compound has been synthesized by the reaction of 〔RuCl 2(PPh 3) 3〕 and closo 〔B 10 H 10 〕 2- in (CH 3) 2CHOH solution. Crystals suitable for a single crystal X ray diffraction analysis were obtained from n pentane diffused to CH 2Cl 2 solution. The crystal {(PPh 3) 2ClRu( μ Cl)Ru(PPh 3)B 10 H 7〔OCH(CH 3) 2〕 3}·0.4(H 2O) is monoclinic , space group P2 1/n , M r= 1359.47, with a=19.434(4), b =14.340(4), c=25.865(9) , β= 95.48(3)°, V=7175(4) 3, D c =1.258 g/cm 3, Z=4, λ (Mo Kα )=0.71073, μ=6.03 cm -1 , F(000)=2784, R=0.0631, wR 2 = 0.1425, S =1.001. The title compound is a bimetallic species in which the second ruthenium center is bound to the cluster {(PPh 3)RuB 10 H 7〔OCH(CH 3) 2〕 3} via an Ru-Cl-Ru and two Ru-H-B-Ru bridges. The third isoproxy group replaces a hydrogen atom on B(10) of the cage, which indicates the activity of the cage.
文摘(NH4)11[Na(H2O)2P4W14O58)·12H2O, Mr = 4099. 39, triclinic, space group P1, a = 14. 376(2), b = 19.861(9), c=13. 010(3)(?) , α=104. 68(2), β=91. 37(1), γ= 104. 05(2)°, V = 3471. 1 (?)3, Z = 2, Dc=3. 922g/cm3, μ (MoKα) = 238. 274cm-1, F(000) = 3664, R = 0.0510, Rw = 0. 0665 for 9260 observed reflections with I> 3σ(I). The polyanion [Na(H2O)2P4W14O58]11- consists of two PW7O29 subunits anisostructurally, two linkage phosphorous atoms and one sodium ion with two water ligands as well. The geometries of tungsten atoms within these two subunits are almost the same as those in K12P4W14O58· 21H2O[2]. The four phosphorous atoms are in PO4 coordinations. The sodium ion locates nearly at the center of the polyanion, and is coordinated by two water molecules, five oxygen atoms of the anion and one phosphorous atom with Na-P = 3. 053(3) (?). Due to the presence of the sodium atom, the interactions between oxygen and tungsten atoms in the polyanion are somewhat weakened.
文摘In the paper, a new mixed algorithm combined with schemes of nonmonotone line search, the systems of linear equations for higher order modification and sequential quadratic programming for constrained optimizations is presented. Under some weaker assumptions,without strict complementary condition, the algorithm is globally and superlinearly convergent.
