In this paper, some inequalities for sequence rearrangement and matrix product are established. The authors extend and improve some known results, and show that there are some errors in reference on inequalities for s...In this paper, some inequalities for sequence rearrangement and matrix product are established. The authors extend and improve some known results, and show that there are some errors in reference on inequalities for sequence rearrangement by examples.展开更多
Fe based cast alloys with double phases structure of m etastable austenite m atrix an d eutecticcarbide M7 C3 were provided with the excellent properties of high abrasion resistance andhigher i m pact toughness . ...Fe based cast alloys with double phases structure of m etastable austenite m atrix an d eutecticcarbide M7 C3 were provided with the excellent properties of high abrasion resistance andhigher i m pact toughness . An i m portant reason of high abrasion resistance is hard ness violentincreasing on the m atrix surface because of w ear easily induced m artensite transfor m ation . The exploitation and applications of m etastable austenite m atrix wear alloys of Fe C Cr Nisyste m and Fe C Cr Mn system were described in this paper . The excellent properties of thesealloys w ill be sufficiently indicated by authors’exa m ples . To exploit a class of these alloyswith high abrasion resistance and various im pact toughness for m eeting the requirem ent of dif ferent environ ment , the proble m of the structure design of metastable austenite m atrix wearalloy w as also described in this paper .展开更多
A generalm atrix equation ∑m s= 0 ∑s t= 0 XtAstXs- t= 0 in unknow n X ofdegree m is con- sidered. The solvability of the equation w ithin som e restricted subsets of n×n m atrices is dis- cussed. The m ethods o...A generalm atrix equation ∑m s= 0 ∑s t= 0 XtAstXs- t= 0 in unknow n X ofdegree m is con- sidered. The solvability of the equation w ithin som e restricted subsets of n×n m atrices is dis- cussed. The m ethods offinding the set ofsolutions in the subsetfor the equation are also provid- ed.展开更多
文摘In this paper, some inequalities for sequence rearrangement and matrix product are established. The authors extend and improve some known results, and show that there are some errors in reference on inequalities for sequence rearrangement by examples.
文摘Fe based cast alloys with double phases structure of m etastable austenite m atrix an d eutecticcarbide M7 C3 were provided with the excellent properties of high abrasion resistance andhigher i m pact toughness . An i m portant reason of high abrasion resistance is hard ness violentincreasing on the m atrix surface because of w ear easily induced m artensite transfor m ation . The exploitation and applications of m etastable austenite m atrix wear alloys of Fe C Cr Nisyste m and Fe C Cr Mn system were described in this paper . The excellent properties of thesealloys w ill be sufficiently indicated by authors’exa m ples . To exploit a class of these alloyswith high abrasion resistance and various im pact toughness for m eeting the requirem ent of dif ferent environ ment , the proble m of the structure design of metastable austenite m atrix wearalloy w as also described in this paper .
文摘A generalm atrix equation ∑m s= 0 ∑s t= 0 XtAstXs- t= 0 in unknow n X ofdegree m is con- sidered. The solvability of the equation w ithin som e restricted subsets of n×n m atrices is dis- cussed. The m ethods offinding the set ofsolutions in the subsetfor the equation are also provid- ed.
