The Paper summarized the following latest development and research on the electrolytic tantalum capacitor: ①substitute conducting polymer or superfine powder of precious metal for traditional electrolyte MnO_2;②substitute niobium for tantalum completely or partly;③adopt pint-sized chip tantalum capacitor.

With the development of Internet technology,communications increase dramatically and tend to be internationalized.To enhance work efficiency and creative ability,it is necessary to avoid the complicated and dwell on the simplified.Description is made of the adoption as much as possible of the world-applicable codes and specifications.

This paper simply describes operating mechanism of 2EE and EJB,and summarizes the procedures of developing information system based on EJB.The said information system is proved to feature easy integration and good flexibility.

Brief description is made of (Nd,Mm)_3(Fe,Co,Ni)_ 14 B-type anisotropic magnets produced by powder blending.The main features of the said material is also introduced.

Preparation of ultra-fine cemented carbide in Widia GmbHin Germany is introduced.Properties of ultra-fine cemented carbide are studied and areas of application are also described.

Crystalline hydrated yttrium carbonate and hydrated crystalline ammonium and yttrium carbonate compound are obtained by precipitation of yttrium sulphate solutions with different amount of ammonium bicarbonate under given conditions.The process and mechanism of conversion of amorphous precipitate into crystalline precipitate during precipitation and aging were studied by element anaysis,X-ray powder diffractometry,infra-red spectrometry,thermal analysis and scanning electron microscope.

Dense and adhesive hydroxyapatite bioceramic film was electro-chemically deposited on titanium substrate.The effect of H 2O 2 addition was studied with a solution containing 0.01mol/dm 3 calcium ion,0.006mol/dm 3 phosphate ion and at 55℃.All deposits were hydroxyapatite in this study,independent of H 2O 2 addition.But it is found that the cathodic current starts at ca.-0.2V with H 2O 2 addition while the corresponding potential is -1.4 V without H 2O 2 addition.The vigorous evolution of H 2 gas can also be eliminated after using H 2O 2.

Study is made on the use of Cu-based and Fe-Cr-based alloy as the binding phase of TiO-based Cermet gild material.The results showed that pure Cu and Fe-Cr alloy has lower wettability on Tio,as is not suitable for TiO binding phase.The addition of small amount of Mo,C in Cu can distinctly improve the wettability,while the addition of proper amount of Al,Ni and Si into Cu-Mo-C means alloy color similar to gold and good wearability as well as very high inferface bond strength with TiO,as are suitable as binding phase of TiO ceramic.The wettability of Fe-Cr alloy can be remarkably improved and the reaction at Fe-Tio interface can be controlled to form very high strength at the interface with TiO by addition of surface active substance A,Fe-Cr can be used as binding phaes of TiO Ceramic.

One newternary compound of Eu 3+ -AAOM-TTA(AAOM:acrylamide(70%)/acrylic acid(30%)oligomer,M n=10000;TTA:2-thenoyltrifluoroacetone)was synthesized and its fluorescent spectrum was measured.The luminescent intensity is greater than that of NaEu(TTA) 4,(a strong light emitter),and twenty times bigger than that of E 3+ -AAOM binary compound.The influence of synthetic conditions on luminescent intensity was investigated.The composite is a potential good luminescent material.

The study is made on technical conditions for measuring of HR hardness under different status of some steel-bonded WC widely used at home.The main factors influencing the accuracy of measured hardness of steel-bondee WC are presented.