The fiber length,diameter,cell wall thickness and ratio of length to width are 891.2 μm,20.34 μm,6.05 μm and 46.0 respectively,and they all gradually increase with the increase of ages.

The experimental results indicate that the MWCNTs having large length diameter ratio,good morphology and high yield can be prepared as long as the ratio of CH 4 and H 2 holds on 2∶1 and the gross flowing rate remains constant.

The results showed that the number,length,diameter and the highest survival rate of cuttings reached 28.6,23.8 mm,1.58 mm and 66.67%,respectively which improved 9.6,7.4 mm,0.36 mm and 46.67% than the control,respectively.

Results Length,diameter,wall thickness,lumen area,and cross-sectional wall area were (5.62±0.48) cm,(1.17±0.08) cm,(0.54±0.05) mm,(98.11±13.38) mm 2 and (9.81±1.52) mm 2 .The hepatic portal vein wall of pig was composed of tunica intima,tunica media and tunica adventitia.

The length,diameter,tensile strength and stretching extend of coarse wool at 11months were respectively 11 55 cm,47 04 μm,24 33 cN and 47 33%,those of downs were respectively 7 36 cm,15 64 μm,4 73 CN and 45 37%.

Compared with control,the length,diameter,100-leave weight,and dimension per leaf of vegetative shoot were increased by20.4%,30.2%,20.5%and5.3%,respectively.

Commercial 5083 Al is chosen as a model material; moreover, in the numerical model, nonspherical droplets are approximated as cylinders with a length/diameter ratio of 3.

basket dissolution method was used to evaluate the in vitro drug release kinetics and the effect of the aspect ratio (length/diameter) on drug release.

The fibers were spun by the phase inversion process and cut into different aspect ratios (length/diameter).

Internodes had progressively foreshortened geometric proportions (length/diameter quotient).

The prepared spinel NiFe2O4 fibres having grain sizes of 60-70 nm were featured with diameters of about 1 μm, and aspect ratios up to 106 (length/diameter).

This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil...

This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil film are greater and stability conditions are basically the same. With the same coefficients of load capacities, the oil flow for the turbulent operation will be a little greater or smaller, the power losses and temperature rises will be about thrice larger and the regions of stability will be slightly narrower. Thus the data for laminar operation may be used to estimate the stability performances for turbulent operation in case of lack of the turbulent data; (3) a comparison among several theories of the turbulent lubrication developed abroad more recently by Constantinescu, Ng and Pan, Aoki and Harada and Hirs. These theories have been examined and analysed. The result shows that the theory put forward by Aoki and Harada is the best of all. On the other hand the Hirs Theory is obviously unreasonable when it is used with large eccentricities; (4) suggestions and recommendations made to the manufacturer concerned: recommending the length diameter ratio should be chosen as 0.75, the elliptic ratios should be chosen between 0.5 and 2/3 and some kinds of grooves for oil outflow should be made in the region of the oil film rupture to reduce power losses; (5) a preliminary disoussion on the rational criteria for determining the flow regime in the oil film of an elliptio bearing. The materials in the paper may prove helpful in designing, calculating and experimenting with bearings for turbulent operation.

The static and dynamic characteristics as well as the stability data of elliptical bearings are presented in considerable detail. The influence of main design parameters of the bearing such as clearance ratio, ellipticity and length diameter ratio on bearing characteristics and stability are analyzed and discussed. Some recommendations for the selection of these parameters are contributed.

Bheological properties and morphology of the title polyblends were studied by using Instron capillary rheometer, examination of photomicrographs and labelling.It was found that the PDS is dispersed in the polypropylene as t separate phase of typically spherical globules, and that the particle size varies with shear rate of extrusion, length/diameter ratio of the capillary and molecular weight of the PDS.