There are B-H bond, H-H bond and atom-molecular bond in BH+4 and BH4. There are four equivalent B-H bonds in BH-4. In the case of BH4 there is an unpaired electron that occurs near the boron atom.

Bleaching experiments on soda-anthraquinone (AP + AQ) and kraft pulps (KP) of E. citriodora have been carried out in the H, H-H, C-E-H, and C-E-H-D sequences. Bleaching properties of kraft pulps of E.

However it is shown that the H2 molecule can be adsorbed on Ag(111) surface with H-H bond paralled to the surface, this result seems to be in fairly good agreement with the result of high resolution electron-energy-loss spectra for H2 on Ag at low temperature.

A method of determining the three-dimensional structure for proteins in aqueous solution by a set of distance constraints between backbond atoms (mainly for H -H, obtained from NMR) was developed.

The structure of BMPAzo was confirmed with NMR,MS,IR techniques and elementary analysis. The peaks in the NMR spectrum were interpreted in detail with the study of the two dimension H-H spetrum.

n algorithm was developed to calculate protein solution conforniations from 2DNOESY intensities. With the complete relaxation matrix analysis programMARDIGRAS the H-H atom distance constraints are evaluated. With the distaneegeometry program DISMAN the three dimensional structures of proteins are calculatedwhich are refined further by the restrained molecular dynamics program r-MD andthe energy rninimization program r-EM.

Using a quasiclassical trajectory method, the results including vibration rotation coupled excitations and a aligned propensity of the rotational excitations for H-H 2O colliding system were presented, which are agreement essentially with the recent experiments.

These features are obtained by long-term physiological experiments, or by H-H equation with computer simuiation which we carried out The neuron models, which have these nine neuron properties, are not convenient for mathematical analysis.

The resuItsshowed that the subunit structure of fibroin expresses two different types : Bombyx moriand Bombyx mandarina are H-L type , Antheraea pernyi、Antheraea yamamai、Philosamia cynthia Philosamia cynthia ricini are H-H type , The six silkworms havespecies specificility in amino acid composition of their fibroin.

The molecular mechanics calculation started with the sugar-rings inchair-form，CH_3 used instead of R_F group．Conformer 1 is convinced as the stableone in polar solvents by energy minimization. Good agreement is observed betweenthe calculated and expermental H-H distances of conformer 1.

A parameter equqtion has been introduced to the boundary slip line in the Drawing deformed zone with a fractional reduction ε=(H-h)/H=2sinθ/(1+2sinθ) and a distributed function of hydrostatic pressure P has been obtained using integration by substitution.

The profiles of local density and distribution functions of the dipole moment orientations, the directions of valence and H-H bonds were obtained.

The extinction ratio is found from the relation k = dD/dh, where dD = D(h)-D(h0) is the difference of the optical densities in the working cell and in the comparison cell and dh = h-h0 is the difference of the thicknesses.

Structure of products of H-H and C-H bond activation by Ni atom, Ni2 cluster, and Ni-porphyrin complex of Ni2 cluster

New catalytic systems based on porphyrin complexes of Ni2 cluster and capable of activating C-H and H-H bonds are proposed.

The isomerization of the bridged Pd2H2complex into the transcomplex with a maximal barrier of 21.5 kcal/mol rather than the activation of the H-H bond is the most important reaction step.

The analysis of rigid frames with so called "span-change" beams such as curved, gabled, folded or trussed ones is rather difficult. The method of redundant forces or method of slope deflection are too tedious to be used in practical work. In this paper a new method namely the method of propagating unbalanced moments and lateral forces is proposed for analyzing such frames.The principle of this method is some what like that of the one cycle method of moment distribution for analyzing rigid frames with straight...

The analysis of rigid frames with so called "span-change" beams such as curved, gabled, folded or trussed ones is rather difficult. The method of redundant forces or method of slope deflection are too tedious to be used in practical work. In this paper a new method namely the method of propagating unbalanced moments and lateral forces is proposed for analyzing such frames.The principle of this method is some what like that of the one cycle method of moment distribution for analyzing rigid frames with straight beams and its procedure may be briefly described as follows: the unbalanced moments and lateral forces at all joints of the frame are calculated first and propagated successively to all the other joints by means of a set of the so-called constants of deformation-propagation, which are to be computed from the properties of the frame only. Then its original and various propagated unbalanced moments and lateral forces at each joint are summed up and distributed among all the bar-ends at that joint according to special formulas to obtain the distributed moment and lateral force at each bar-end. Finally, the balanced moment and lateral force at each bar-end are obtained simply by summing up the following three components respectively: (1) those at each bar-end assumed fixed, M~F and H~F; (2) those propagated to each bar-end, M~P and H~P; and (3) those distributed to each bar-end, M~D and H~D. That is:M=M~F+M~P+M~D, H=H~F+H~P+H~D.Evidently, the procedure of this method is very simple and direct, and the work of calculations is greatly reduced, especially when any span-change rigid frame is to be analyzed for many loading conditions.Two typical examples are given in this paper to illustrate the application of the method and the author hopes deeply that this method will be found usefull by the structural engineers in designing such rigid frames.

The use of the method of charaeterictics to solve super-critical flow problems has been previously established by several authors.In most cases,frictional resistance and bottom slope have been neglected.Taking into consideration the above two factors(Fig.1),the equation of continuity and the equations of motion are respectively (hu)_x+(h_v)_y=0.(1) uux+vu_y=g sin i-((g/2h))(h~2osi)_x-τu/ρhq.(2) uv_x+vv_y=-((g/2h))(h~2cos i)_y-τv/ρhq.(3) Where the subscripts denote the variables with respect to which partial...

The use of the method of charaeterictics to solve super-critical flow problems has been previously established by several authors.In most cases,frictional resistance and bottom slope have been neglected.Taking into consideration the above two factors(Fig.1),the equation of continuity and the equations of motion are respectively (hu)_x+(h_v)_y=0.(1) uux+vu_y=g sin i-((g/2h))(h~2osi)_x-τu/ρhq.(2) uv_x+vv_y=-((g/2h))(h~2cos i)_y-τv/ρhq.(3) Where the subscripts denote the variables with respect to which partial differentiations are made. Making use of the condition of irrotational flow v_x-u_y=O,(4) the energy equation can be obtained d((q~2/2))+gcosidh=gsinidx+(1/2)gh sin i·i_xdx-(τqdz)/(ρhu) =(gusini+(1/2)guh sin i·i_(τq)/(ρh))(dx/u).(5) The above are the fundamental equations for the type of flow discussed. It can be shown that the two systems of characteristics in the physical plane and the u v plane(Fig.2)are represented by C~+:dy~+=ξ~+dx~+.(21a) Γ~+ξ~-(dv~+)/(du~+-Gdx~+)=-1.(21b) and C~-:dy~-=ξ~-dx~-.(22a) Γ~-:ξ~+.(dv~-)/(du~-)-Gdx~-=-1.(22b) Where ξ~±=(15) G=(gu sin i+(1/2)guh sin i·i_x+(τq/ρh))/(u~2-ghcosi).(23) The superscripts + and- refer to the pertinent system of characteristics. For flat-bottom,frictionless channels,G=0;(21b)and(22b)indicate that at cor- responding points the tangents of C~+ and C~- are perpendicular to those of Γ~- and Γ~+ respectively and the Γ characteristics are systems of epicycloids. Taking into consideration the varying bottom slope along the x-direction and the bottom friction τ,it can be shown that the velocity vector still bissets the C characteristics(Fig.2) and both A~+ and A~- are given by q~2sin~2A=ghcosi.(20) With G different from zero,(21b)(22b)can no longer be integrated to give analytic forms and the angles between the tangents,φ~+ and φ~-,no longer equal to π/2.How- ever,based on these two equations,a graphical method is proposed,as illustrated in Fig. 6.

Systematic scour tests of solid and artificially dispersed two-dimensional water jets have been carried out with sand and gravel as bed materials. The angles of inclination of jets are 45°and 90°. Based on the results of experiments, two different types of scour, i.e., the shallow tailwater type and the deep tailwater type, are proposed. In the former type, the depth of water in the scoured pit required for equilibrium is independent of the tailwater depth, whereas in the latter, it is dependent on the tailwater...

Systematic scour tests of solid and artificially dispersed two-dimensional water jets have been carried out with sand and gravel as bed materials. The angles of inclination of jets are 45°and 90°. Based on the results of experiments, two different types of scour, i.e., the shallow tailwater type and the deep tailwater type, are proposed. In the former type, the depth of water in the scoured pit required for equilibrium is independent of the tailwater depth, whereas in the latter, it is dependent on the tailwater depth. The law of diffusion of solid jets in the water cushion is found to be similar to that of free turbulent jets. In the case of 90°, the ratio between the initial velocity of a solid jet in the immerging section and the average velocity on the bottom of the pit, when the scouring action has reached its equilibrium condition, is found as shown in Fig 4 or formulas (10) and (11). Meanwhile, the bottom velocity is found to be smaller than the scouring velocity of the bed material under uniform flow condition, and the relation between them is shown in Fig. 5 or formula(13). The effect of the degree of dispersion and aeration of water jets on the depth of scour is also preliminarily investigated. In the case of 45°jets (both solid and dispersed), formulas for the estimation of scour are given as follows: For the shallow tailwater type, h_p=1.38Φ~(0.25)/((a~(1/9)D~(0.25))q~(0.75)z_0~(0.125).(26a) For the deep tailwater type, h_p=2.3×(q)/(1/2)~((p_s-p)/p×gD)+3/(a+3)h_H. (27a) Comparison of the data on model tests of bucket type energy dissipators with the corresponding results computed by these formulas shows that they are fairiy consistant.