Ⅰ. INTRODUCTION K3[Fe（CN）6] is a classical coordination compound whose thermal stability has been investigated by several workers. However, the mechanism of the decompo-sition reaction has not been well expounded. ...Ⅰ. INTRODUCTION K3[Fe（CN）6] is a classical coordination compound whose thermal stability has been investigated by several workers. However, the mechanism of the decompo-sition reaction has not been well expounded. In particular, the first stage of decomposition was suggested展开更多
This paper investigates the predator-prey system:x=k_1(x-ax)-k(x)y,y=(-k_3+βk(x)ywit.k(x)=k_2x, x≤x, k_2x, x>τ,where α, β, τ; k_1, k_2, k_3 are positive constants.The main results are as follows(i) In case k...This paper investigates the predator-prey system:x=k_1(x-ax)-k(x)y,y=(-k_3+βk(x)ywit.k(x)=k_2x, x≤x, k_2x, x>τ,where α, β, τ; k_1, k_2, k_3 are positive constants.The main results are as follows(i) In case k_3-βk_2τ≥0 system (1) has no limit cycle.(ii) In case k_3-βk_2τ<0, k_1+k_3-βk_2τ> and for O<α<<1, system (1) at least has two limitcycles.展开更多
For a right Noetherian ring R with 1, G0（R） and G1（R） denote the Grothendieck group K0（（?）R） and the Whitehead group K1（（?）R） respectively, where （?）R is the Abelian category of the finitely generated ri...For a right Noetherian ring R with 1, G0（R） and G1（R） denote the Grothendieck group K0（（?）R） and the Whitehead group K1（（?）R） respectively, where （?）R is the Abelian category of the finitely generated right R-modules. In fact, G0（R） is展开更多
During the past two decades, a great deal of studies have been done in an attempt to improve the properties of the practically useful hard-magnetic material BaFe12O19 （BaM） by using the substitutional method. Unfort...During the past two decades, a great deal of studies have been done in an attempt to improve the properties of the practically useful hard-magnetic material BaFe12O19 （BaM） by using the substitutional method. Unfortunately, no remarkable progress about the basic magnetic properties has been made yet. One of the important aspects of these studies is the use of transition ions with strong anisotropy to replace the Fe3+ in BaM. The anisotropy ions reported are, for example, the first transition-metal ions Co2+[1], Fe2+[2] and the third transition-metal ions Ir4+[3] et al. The experiments show that all these anisotropy ions made a negative contribution to uniaxial anisotropy K1 at room temperature, i.e. ΔK1<0.展开更多
The Mo（Ⅲ） ion has a 4d3 electronic configuration, a nd the expected octahedral 6 coordination has been confirmed by some X-ray structural studies such as K3Mo （NCS）6. H2O·CH3COOH, MoCl3（py）3 and MoCl3（tu...The Mo（Ⅲ） ion has a 4d3 electronic configuration, a nd the expected octahedral 6 coordination has been confirmed by some X-ray structural studies such as K3Mo （NCS）6. H2O·CH3COOH, MoCl3（py）3 and MoCl3（tu）3, but results of structural research work are still not many. It seems to be worthy to take a further investigation of Mo （Ⅲ） complexes. et al. and Kumorita et al. had reported the preparation and some properties for MoCl3（urea）3. In order to obtain its further information about the struc-展开更多
文摘Ⅰ. INTRODUCTION K3[Fe（CN）6] is a classical coordination compound whose thermal stability has been investigated by several workers. However, the mechanism of the decompo-sition reaction has not been well expounded. In particular, the first stage of decomposition was suggested
文摘This paper investigates the predator-prey system:x=k_1(x-ax)-k(x)y,y=(-k_3+βk(x)ywit.k(x)=k_2x, x≤x, k_2x, x>τ,where α, β, τ; k_1, k_2, k_3 are positive constants.The main results are as follows(i) In case k_3-βk_2τ≥0 system (1) has no limit cycle.(ii) In case k_3-βk_2τ<0, k_1+k_3-βk_2τ> and for O<α<<1, system (1) at least has two limitcycles.
文摘For a right Noetherian ring R with 1, G0（R） and G1（R） denote the Grothendieck group K0（（?）R） and the Whitehead group K1（（?）R） respectively, where （?）R is the Abelian category of the finitely generated right R-modules. In fact, G0（R） is
文摘During the past two decades, a great deal of studies have been done in an attempt to improve the properties of the practically useful hard-magnetic material BaFe12O19 （BaM） by using the substitutional method. Unfortunately, no remarkable progress about the basic magnetic properties has been made yet. One of the important aspects of these studies is the use of transition ions with strong anisotropy to replace the Fe3+ in BaM. The anisotropy ions reported are, for example, the first transition-metal ions Co2+[1], Fe2+[2] and the third transition-metal ions Ir4+[3] et al. The experiments show that all these anisotropy ions made a negative contribution to uniaxial anisotropy K1 at room temperature, i.e. ΔK1<0.
文摘The Mo（Ⅲ） ion has a 4d3 electronic configuration, a nd the expected octahedral 6 coordination has been confirmed by some X-ray structural studies such as K3Mo （NCS）6. H2O·CH3COOH, MoCl3（py）3 and MoCl3（tu）3, but results of structural research work are still not many. It seems to be worthy to take a further investigation of Mo （Ⅲ） complexes. et al. and Kumorita et al. had reported the preparation and some properties for MoCl3（urea）3. In order to obtain its further information about the struc-
