Conventional two-layered thermal barrier coatings （TBCs） are prepared by electron beam physical vapor deposition （EB-PVD） with ZrO2-8 wt% Y2O3 （8YSZ） as top coat and CoCrAlY as bond coat on disk-shaped Ni based ...Conventional two-layered thermal barrier coatings （TBCs） are prepared by electron beam physical vapor deposition （EB-PVD） with ZrO2-8 wt% Y2O3 （8YSZ） as top coat and CoCrAlY as bond coat on disk-shaped Ni based super-alloy. In this paper, three kinds of shot peening process with different lengths of operating time were adopted for bond coating. As a result, changes took place in its surface roughness and the surface micro-hardness. A thermal cycling test at 1 273 Kx55 rain and another at room temperature for 5 min were performed to study the effects of shot peening process on the thermal cycling lifetime of TBCs. It is found that a moderate shot peening process will be able to prolong the life time. The oxidation dynamic of the as-processed TBCs basically accords with the parabolic rule, and the oxidation test also attests to the spallation between YSZ and thermal growth oxide （TGO） responsible mainly for the failure of TBCs.展开更多
The sodium potassium citrato oxotungstate(VI) dimer, Na 4K 2〔W 2O 5\|(cit) 2〕·11H 2O (H 4cit = citric acid) was obtained by the reaction of sodium tungstate(VI) and excess potassium citrate monobasic (KH 3cit) ...The sodium potassium citrato oxotungstate(VI) dimer, Na 4K 2〔W 2O 5\|(cit) 2〕·11H 2O (H 4cit = citric acid) was obtained by the reaction of sodium tungstate(VI) and excess potassium citrate monobasic (KH 3cit) in neutral solution. The crystal data for the title compound: monoclinic, C 12 H 30 K 2Na 4W 2O 30 , M r =1192.21, space group P2 1/n, a=17.427(4), b=10.022(2), c=18.637(3) , β=92.62(1)°, V=3252(2) 3, Z=4, D c =2.435 g/cm 3, μ( Mo Kα )=76.38 cm -1 , F( 000)=2288. The structure was refined to R =0.0434 for 6327 independent observed reflections with I>3σ(I) . The complex anion contains a quasi centrosymmetric (O 2W)O b(WO 2) core with a bent bridging oxo group 〔W-O b-W 175.0(4)°〕. Each citrate as tridentate ligand coordinates to a tungsten atom through the alkoxy, α carboxyl, and one β carboxyl group, while the other β carboxyl group remains uncoordinated. Principal dimensions are: W-O b 1.883(6) , (W=O t)av 1.715(6) , W-O (alkoxy) 1.959(6) , W-O ( α carboxy) 2.176(6) and W-O ( β carboxy) 2.231(6) . The tungsten atom is located in a distorted octahedron environment.展开更多
Objective:To observe and compare the efficacy differences between combined Jin's three-needle and rehabilitation training and rehabilitation training alone for hemiplegia following an ischemic stroke. Methods:A to...Objective:To observe and compare the efficacy differences between combined Jin's three-needle and rehabilitation training and rehabilitation training alone for hemiplegia following an ischemic stroke. Methods:A total of 94 cases who met the inclusion criteria were randomized into an observation group using combined Jin's three-needle and rehabilitation training and a control group using rehabilitation training alone. The therapeutic efficacies were then assessed respectively before treatment, 14 d and 28 d after treatment using neurological deficient scale (NDS) and short-form Fugl-Meyer assessment (SFFMA) scale. Results:After treatment, the NDS and SFFMA scores in both groups were significantly improved (P<0.05); after 28-day treatment, the inter-group comparison showed a statistical significance (P<0.05). Conclusion:Combined Jin's three-needle and rehabilitation training and rehabilitation training alone can both enhance the nerve function recovery of patients with post-stroke hemiplegia and improve their motor function; however, the former could obtain better effects than the latter.展开更多
基金National Natural Science Foundation of China (50571005 50420130032)
文摘Conventional two-layered thermal barrier coatings （TBCs） are prepared by electron beam physical vapor deposition （EB-PVD） with ZrO2-8 wt% Y2O3 （8YSZ） as top coat and CoCrAlY as bond coat on disk-shaped Ni based super-alloy. In this paper, three kinds of shot peening process with different lengths of operating time were adopted for bond coating. As a result, changes took place in its surface roughness and the surface micro-hardness. A thermal cycling test at 1 273 Kx55 rain and another at room temperature for 5 min were performed to study the effects of shot peening process on the thermal cycling lifetime of TBCs. It is found that a moderate shot peening process will be able to prolong the life time. The oxidation dynamic of the as-processed TBCs basically accords with the parabolic rule, and the oxidation test also attests to the spallation between YSZ and thermal growth oxide （TGO） responsible mainly for the failure of TBCs.
文摘The sodium potassium citrato oxotungstate(VI) dimer, Na 4K 2〔W 2O 5\|(cit) 2〕·11H 2O (H 4cit = citric acid) was obtained by the reaction of sodium tungstate(VI) and excess potassium citrate monobasic (KH 3cit) in neutral solution. The crystal data for the title compound: monoclinic, C 12 H 30 K 2Na 4W 2O 30 , M r =1192.21, space group P2 1/n, a=17.427(4), b=10.022(2), c=18.637(3) , β=92.62(1)°, V=3252(2) 3, Z=4, D c =2.435 g/cm 3, μ( Mo Kα )=76.38 cm -1 , F( 000)=2288. The structure was refined to R =0.0434 for 6327 independent observed reflections with I>3σ(I) . The complex anion contains a quasi centrosymmetric (O 2W)O b(WO 2) core with a bent bridging oxo group 〔W-O b-W 175.0(4)°〕. Each citrate as tridentate ligand coordinates to a tungsten atom through the alkoxy, α carboxyl, and one β carboxyl group, while the other β carboxyl group remains uncoordinated. Principal dimensions are: W-O b 1.883(6) , (W=O t)av 1.715(6) , W-O (alkoxy) 1.959(6) , W-O ( α carboxy) 2.176(6) and W-O ( β carboxy) 2.231(6) . The tungsten atom is located in a distorted octahedron environment.
基金supported by the 11th Five Years Key Programs for Science and Technology Development of China(2006BAI12B02-3)
文摘Objective:To observe and compare the efficacy differences between combined Jin's three-needle and rehabilitation training and rehabilitation training alone for hemiplegia following an ischemic stroke. Methods:A total of 94 cases who met the inclusion criteria were randomized into an observation group using combined Jin's three-needle and rehabilitation training and a control group using rehabilitation training alone. The therapeutic efficacies were then assessed respectively before treatment, 14 d and 28 d after treatment using neurological deficient scale (NDS) and short-form Fugl-Meyer assessment (SFFMA) scale. Results:After treatment, the NDS and SFFMA scores in both groups were significantly improved (P<0.05); after 28-day treatment, the inter-group comparison showed a statistical significance (P<0.05). Conclusion:Combined Jin's three-needle and rehabilitation training and rehabilitation training alone can both enhance the nerve function recovery of patients with post-stroke hemiplegia and improve their motor function; however, the former could obtain better effects than the latter.
