带着沙发去旅行

50年来,胡胡沙发成为越来越多人必不可缺的随身品,从金庸、刘德华、林忆莲到驻华使馆官员。不管下一站是哪里,一定要带着胡胡沙发一起出发。     

带着沙发去旅行

50年来,胡胡沙发成为越来越多人必不可缺的随身品,从金庸、刘德华、林忆莲到驻华使馆官员。不管下一站是哪里,一定要带着胡胡沙发一起出发。     

Contact of a spherical particle with a droplet

The collection of particles by liquid drops is profoundly influenced by the contact angle of the particles with the drops and the surface tension of the drops. The present investigation was undertaken to establish an equation with reference to the force which acts on a particle by surface tension after contact of a particle with a drop, and to simplify its solution. Moreover, the approximate equations obtained can be applied as regards the arbitrary contact angle of a particle with a drop and the arbitrary ratio of the radius of the drop to the particle. The agreement between theoretical and experimental values could be verified by this experiment.It is considered from these results that the approximate equations can be utilized when it is necessary to know the behaviour of a particle after contact with a liquid drop.     

Extraction into a flow of a fluid with a velocity gradient

Unsteady extraction from a system of semi-infinite capillaries to the flow of a fluid with a linear velocity gradient is studied. An assumption that the diffusion in the flow is a quasi-steady-state process is taken to obtain a linear equation for the local mass flux from the pore space, which involves fractional derivatives with respect to time and flow coordinate. Limiting solutions for the total diffusion flux at small and large times that cover the entire time interval are found.     

Polypropylene blends with a phenoxy

Polypropylene (PP) blends with a phenoxy have been prepared in various compositions using a Brabender Plasticorder. Scanning electron microscopy (SEM) micrographs showed a clean two-phase morphology. The domains were larger when PP formed the dispersed phase, probably due to the greater melt viscosity of PP. The melting peak temperature (T_m) of PP decreased marginally, whereas the glass transition temperature (T_g) of phenoxy increased by 5-10°C, in the blends. X-ray diffraction measurements indicated that PP crystallizes in a hexagonal β-form in 50/50 and 30/70 (PP/phenoxy) blends. Mechanical properties of the blends generally showed negative deviation from the additivity rule, perhaps due to the inherently immiscible nature of the blends. © 1996 John Wiley & Sons, Inc.     

Sibirfom with a brecciated structure

Power-saving grit-powder technology is suggested for the production of block sibirfom, which gives a new kind of original decorative and facing materials. The dependences of the density and strength of the sibirfom on the amount of grit in the charge are presented.Translated from Steklo i Keramika, No. 12, pp. 6–8, December, 1995.     

Olefinations with a polymer-supported phosphinate

Ethyl 4-polystyryl(ethylphosphino)acetate has been prepared with a 2% crosslinked polystyrene. Its reactions with sodium exthoxide and an aldehyde or ketone give modified Wittig olefinations.     

Spouting with a porous draft-tube

Particle motion and gas distribution have been measured in 0.3 m spouted beds with porous and solid wall draft-tubes. Particle velocity in the annulus varied with gas rate and bed geometry. Narrow particle residence time distributions were observed under all conditions. Annular gas flow with the porous tubes exhibited a characteristic maximum in the lower part of the bed. A computer model has successfully simulated this phenomenon. The porous tube had a higher annular airflow than the solid tube at low separation distances, and a lower pressure drop for a given annular flow. A composite porous and solid wall tube offers improved performance.     

带有观察窗的模具

美国制造了一种带玻璃窗的模具。其玻璃窗是由制造飞机窗的熔融石英材料制作，厚10．16cm。用2个O型圈和1个垫圈将其与模盖隔开。理论上模具压力可高达1406kg／cm^2。有了这个观察窗，可清楚地观察树脂在模腔的复杂变化过程。     

Lending a Hand to Recyclers with a Low—Density Adhesive

研究在一般EVA热熔胶中用聚丁烯取代20％～50％的松香酯，使胶的密度从0．975降至0．936～0．970范围，结果表明不影响热熔胶性能．但成本可下降，尤其较易在纸浆工序中清除。     

Extraction from a solid with a bidisperse porous structure

A mathematical model is proposed for the process of extraction from a semi-infinite solid containing the pores of two types: large pores that extend to the surface and small pores that are connected to large pores. Effective transport coefficients in two types of pores are assumed to be different. The dependence of the flux of an extractant through the surface of the solid on time is found using the method of fractional differentiation. Theoretical results are compared with experimental data on the kinetics of the extraction of the target components from raw vegetable materials in apparatuses with an intensive hydrodynamic mode.