轮类
1.This paper analyzes the process charateristics of the machining of the cam axis, and puts forward the unsolved key technique in high speed and precision NC grinding of the cam axis.
2.This work decomposes South Pointing Chariots into four sub-parts, including the inputs, the transmission device, the passive feedback mechanism, and the output.
3.(3) improving the accuracy of weigh-in-motion (WIM) to accord with the request of ASTM E1318-94 specification Type III WIM systems.
4.Certain kind of attacks on some block ciphers may be efficiently resisted by mixing the round keys with a group of frequently changed numbers computed from system time and the counter of data blocks.The general form of such practical schemes has been discussed.Because the changing of certain part of round keys is often much faster than the operations of certain rounds of encryption (or decryption),the efficiencies of this kind of block cipher schemes are quite obvious.In security,as nearly every plaintext data block is encrypted with different keys,and as most attacking techniques have high demands of plaintext/ciphertext pairs,it is difficult for them to work in such a cipher scheme.This may result that a block cipher with time and counter parameters is secure even with cases that the number of round is largely reduced.As an important example of the entire solution,we introduce a cipher scheme TCR6 which has some satisfactory features in both security and efficiency.
5.Hanasi Lake was surveyed twice,in Aug.1987 and July 1988.According to the analysis of samples,21 speceis of zooplankton have been identified, among which,1 speceis belongs to Protozoa,11 to Rotifera,6 to Cladocera and 3 to Copepoda.
6.Furthermore, the recombinant phage was lysed by coculture with helper VCSM13. Results Fab displayed on the surface as fusion protein with the N terminal of coat protein Ⅲ, and 4.8×10 6 clone library was established. Antibodies against lipid A of bacterial endotoxin were screened. Specific antibodies against lipid A of bacterial endotoxin were enriched by 100 times after three rounds of panning with lipid A.
7.OPTIMUM COMBINATION OF MOTION CURVE OF CAM MECHANISM WITH STEP-TYPE FUNCTIONS
8.The population structure of zooplankton was investigated at Daxingkai Lake in May, July and September 2001. There were 32 species of zooplankton, in which rotifera (43.8%), protozoa (31.2%), cladocera and copepoda (25% ) were of the predominate.
10.The main products are sprocket for motorcycle (vehicle)and crank-shaft for general machinery.
