초록 ▼

A low resistance splice connects two cable-in-conduit superconductors to each other. Dividing collars for arranging sub-cable units from each conduit are provided, along with clamping collars for mating each sub-cable wire assembly to form mated assemblies. The mated assemblies ideally can be accomp

A low resistance splice connects two cable-in-conduit superconductors to each other. Dividing collars for arranging sub-cable units from each conduit are provided, along with clamping collars for mating each sub-cable wire assembly to form mated assemblies. The mated assemblies ideally can be accomplished by way of splicing collar. The mated assemblies are cooled by way of a flow of coolant, preferably helium. A method for implementing such a splicing is also described.

대표청구항 ▼

A low resistance splice connects two cable-in-conduit superconductors to each other. Dividing collars for arranging sub-cable units from each conduit are provided, along with clamping collars for mating each sub-cable wire assembly to form mated assemblies. The mated assemblies ideally can be accomp

A low resistance splice connects two cable-in-conduit superconductors to each other. Dividing collars for arranging sub-cable units from each conduit are provided, along with clamping collars for mating each sub-cable wire assembly to form mated assemblies. The mated assemblies ideally can be accomplished by way of splicing collar. The mated assemblies are cooled by way of a flow of coolant, preferably helium. A method for implementing such a splicing is also described. ng polyolefins, which comprises contacting a catalyst system comprising (a) a metallocene compound having the general formula: CpAXMQ1Q2Cp'A'X'M'Q1'Q2' wherein Cp and Cp' we each independently a substituted or unsubstituted cyclopentadienyl moiety wherein each said cyclopentadienyl moiety is substituted or unsubstituted indenyl; M and M' are each a metal chosen from Group IV B transition metals and vanadium, and coordinate to Cp and Cp' respectively; X and X' are each independently a substituted or unsubstituted Group VA or VIA heteroatom and coordinate to M and M' respectively; A and A' are bridging groups between Cp and X and between Cp' and X' respectively and are independently chosen from --SiR'2--O--SiR'2--SinR'm--, --CnR'm-- and --CR'2' SiR'2--CR'2--SiR'2--, in which each R' is independently H or hydrocarbyl having 1 to 20 carbon atoms, n is an integer in the range 1 to 4 and m=2n; each Q1,Q2and Q1' and Q2' is independently a coordinating group which is hydrogen, halogen, or hydrocarbyl having 1 to 20 carbon atoms and each of Q1and Q1' is coordinated to both M and M'; and (b) an aluminum- or boron-containing cocatalyst capable of activating the metallocene compound with at least one olefin in a reaction zone under polymerization conditions. 2. A process according to claim 1, wherein the olefin is propylene and the polyolefin is isotactic polypropylene. 3. A process according to claim 1, wherein the metallocene compound is (t-butylamido) (2-methyl-4,5-benzoinden-1-yl)-1,1-dimethyl silane zirconium chloride or (t-butylamido) (2-methyl-4,5-benzoinden-1-yl)-1,1-dimethyl silane titanium chloride. 4. A process according to claim 1 wherein said metallocene compound has an active site and wherein said active site has local C2 symmetry. 5. A process according to claim 1 wherein the indenyl moiety is benzoindenyl. 6. A process according to claim 1 wherein the cyclopentadienyl moiety is substituted at position 2 with a hydrocarbyl having 1 to 20 carbon atoms. 7. A process according to claim 1 wherein said metallocene compound has a dimeric structure. 8. A process according to claim 1, wherein the metal is Zr. 9. A process according to claim 1, wherein the heteroatom is nitrogen, phosphorus, oxygen or sulphur and is substituted with H, hydrocarbyl having 1 to 20 carbon atoms or silyl. 10. A process according to claim 9, wherein the heteroatom is nitrogen. 11. A process according to claim 1 wherein A is SiR'2. 12. A process according to claim 11, wherein each R' is methyl. 13. A process according to claim 1, wherein the catalyst further comprises an aluminum- or boron-containing cocatalyst capable of activating the metallocene compound. 14. A process according to claim 1, wherein the catalyst system further comprises an inert support present application is a Divisional. n the range of about 5° C. to about 100° C. in the presence of a metal salt of a cyclic alcohol, wherein the molar ratio of the metal salt of the cyclic alcohol to the lithium initiator is within the range of about 0.05:1 to about 10:1, and wherein the process is conducted in the absence of polar modifiers. atively linked to a DNA sequence encoding a nuclear targeting sequence, (2) selection of desired transgenic plants or transgenic plant cells which have taken up said DNA, and (3) culturing of said desired transgenic plants or transgenic plant cells in a suitable culture medium. 4. The method according to claim 1 or 3, wherein said selection marker is HygR,KmR,PPTR,MtxRor SulR. 5. A transgenic plant or transgenic plant cell prepared by the method of claim 1. 6. A vector which comprises a DNA sequence encoding a nuclear targeting sequence operatively linked to a sequence that encodes a RecA and further comprising a DNA sequence encoding a selectable marker. 7. A vector which comprises a DNA sequence encoding a T SV40 nuclear targeting sequence operatively linked to a sequence that encodes a RecA and further comprising a DNA sequence encoding a selection marker and the DNA sequence of at least one gene of interest. 8. The method of claim 1 or 3, wherein said nuclear targeting sequence is that of T SV40. 9. The method according to claim 1, wherein said nucleic acid molecule encodes E. coli RecA. 10. The method according to claim 1 or 3, wherein said insertion is mediated via a member selected from the group consisting of PEG transformation, Agrobacterium transformation, electroporation, particle bombardment, liposome fusion, in planta transformation, calcium phosphate precipitation and virus infection. 11. A method for the production of a transgenic plant or a transgenic plant cell with enhanced recombination, comprising (1) insertion of DNA into the genome of a plant or plant cell, said DNA comprising (a) the sequence of at least one gene of interest, and (b) a sequence which encodes a selection marker expressible in said plant or plant cell, and (c) a nucleic acid molecule encoding the amino acid sequence of the E. coli RecA protein, and wherein said nucleic acid molecule of (c) is operatively linked to a DNA sequence encoding the T SV40 nuclear targeting sequence, (2) selection of desired transgenic plants or transgenic plant cells which have taken up said DNA, and (3) culturing of said desired transgenic plants or transgenic cells in a suitable culture medium. 12. The method according to claim 11, wherein said insertion is mediated via a member selected from the group consisting of PEG transformation, Agrobactenum transformation, electroporation, particle bombardment, liposome fusion, in planta transformation, calcium phosphate precipitation and virus infection. 13. A vector which comprises a DNA sequence encoding a T SV40 nuclear targeting sequence operatively linked to a a nucleic acid sequence encoding the amino acid sequence of the E. coli RecA protein, wherein said vector further comprises a promoter that functions in plants, said promoter operably linked to said DNA sequence. 14. The vector according to claim 13, further comprising a DNA sequence encoding a selection marker. 15. The vector according to claim 13, further comprising at least one gene of interest. 16. A vector which comprises a DNA sequence encoding a T SV40 nuclear targeting sequence operatively linked to a sequence that encodes RecA that mediates strand-exchange and further comprising a DNA sequence encoding a selection marker and the DNA sequence of at least one gene of interest. 17. The vector according to claim 6, wherein said nuclear targeting sequence is the T SV40 nuclear targeting sequence or the RecA is the E. coli RecA protein. 18. The vector according to claim 7, wherein the RecA is the E. coli RecA protein. 19. The vector according to claim 17 or 18, wherein said vector is pS/nt-RecA or pEV/nt-RecA. 20. The method according to claim 9, wherein said nuclear targeting sequence is that of T SV40.