Shaft alignment is an important technique during installation and maintenance of a rotating machine. A high-precision laser alignment system has been designed with dual PSDs (Position Sensing Detector) to change tradi...Shaft alignment is an important technique during installation and maintenance of a rotating machine. A high-precision laser alignment system has been designed with dual PSDs (Position Sensing Detector) to change traditional manual way of shaft alignment and to make the measurement easier and more accurate. The system is comprised of two small measuring units (laser transmitter and detector) and a PDA (Personal Digital Assistant) with measurement software. The laser alignment system with dual PSDs was improved on a single PSD system, and yields higher measurement accuracy than the previous design, and has been successful for designing and implements actual shaft alignment. In the system, the range of offset measurement is ±4 mm, and the resolution is 1.5 μm, with accuracy being less than 2 μm.展开更多
A new dinuclear manganese complex [Mn2（L）2（2,2＇-bipy）2（H2O）512·3H2O has been synthesized with MnSO4·H2O, 2,2＇-bibenzoic acid （H2L） and 2,2＇-bipyridine（2,2＇-bipy） in the mixed solvent ethanol an...A new dinuclear manganese complex [Mn2（L）2（2,2＇-bipy）2（H2O）512·3H2O has been synthesized with MnSO4·H2O, 2,2＇-bibenzoic acid （H2L） and 2,2＇-bipyridine（2,2＇-bipy） in the mixed solvent ethanol and water. It crystallizes in monoclinic, space group Pi with a = 9.9944（10）, b = 21.939（2）, c = 25.628（3） A, a = 108.429（3）, β = 100.613（4）, 7 = 102.821（3）°, V = 4997.9（9） A3, Dc= 1.355 g/cm^3, Z = 2, F（000） = 2108, GOOF = 1.074, the R= 0.0626 and wR= 0.1531. The structure of the complex contains two [Mn2（L）2（2,2＇-bipy）2] units, ten coordinated H2O molecules and three uncoordinated H2O molecules. The fluorescence, thermal stability and magnetic properties of the complex were investigated.展开更多
Two new cobalt（Ⅱ）complexes[Co2（2,2?-bipy）2（dpa）2（H2O）5]·4H2O（1）and Co（2,2?-bipy）3（SO4）]·7.5H2O（2）have been synthesized with diaphonic acid（H2dpa）and 2,2?-bipyridine（2,2?-bipy）as ligands....Two new cobalt（Ⅱ）complexes[Co2（2,2?-bipy）2（dpa）2（H2O）5]·4H2O（1）and Co（2,2?-bipy）3（SO4）]·7.5H2O（2）have been synthesized with diaphonic acid（H2dpa）and 2,2?-bipyridine（2,2?-bipy）as ligands.In 1,two neighboring cobalt（Ⅱ）ions are linked together by one bridging diaphonic acid group,forming an asymmetric dinuclear structure.1 crystallizes in triclinic,space group ■ with a=9.825（6）,b=13.007（8）,c=19.586（1）?,α=80.773（1）o,β=77.065（1）o,γ=85.902（1）o,Mr=431.4,V=2406.5（3）?3,Dc=1.48 g/cm3,Z=2,μ（MoKα）=0.767 mm-1,F（000）=1112,the final R=0.0379 and wR=0.0862.The central cobalt（Ⅱ）ions in 1 and 2 are coordinated with six atoms,forming distorted octahedral coordination geometry.The fluorescence and thermal stability properties of 1 and 2 are also reported.展开更多
A new binuclear cage-like yttrium(Ⅲ)complex Y2(TMBA)6(phen)2(1)with yttrium nitrate,2,4,6-trimethylbenzoic acid(TMBA)and 1,10-phenanthroline(phen)was synthesized.It crystallizes in the triclinic space group P1 with a...A new binuclear cage-like yttrium(Ⅲ)complex Y2(TMBA)6(phen)2(1)with yttrium nitrate,2,4,6-trimethylbenzoic acid(TMBA)and 1,10-phenanthroline(phen)was synthesized.It crystallizes in the triclinic space group P1 with a=11.9086(15),b=12.4843(17),c=14.2101(18)?,α=104.977(4),β=111.750(4),γ=95.874(5)o,V=1848.8(4)?3,Dc=1.363 g/cm3,Z=1,μ(Mo Ka)=1.627,F(000)=788,the final GOOF=1.039,R=0.0353 and w R=0.0826.The whole molecule consists of two yttrium ions bridged by four 2,4,6-trimethylbenzoic acid anions.The Y(Ⅲ)ion is coordinated by eight atoms to give a distorted square antiprism coordination geometry.The TG analysis and fluorescent properties of 1 were studied.展开更多
Recent studies suggest that PRL-3 is involved in the metastasis of colorectal cancer, but the mechanism concerning that has not been well defined. This article expresses PRL-1, PRL-2, and PRL-3 and the catalytically i...Recent studies suggest that PRL-3 is involved in the metastasis of colorectal cancer, but the mechanism concerning that has not been well defined. This article expresses PRL-1, PRL-2, and PRL-3 and the catalytically inactive mutant forms of those enzymes in SW620 and SW480 cells, two human cell lines derived from non-metastatic cancer and metastatic colorectal cancer, respectively. While the expression of the native forms of PRLs promotes the spreading, adhesion, and proliferation of these cells, the expression of their mutant forms inhibits the earlier-mentioned processes. These data thus provide a cellular mechanism for the role of PRL-3 in tumor metastasis and suggest that all the three PRLs have similar functions.展开更多
试验对电感耦合等离子体发射光谱法测定饲料中钙、铜、铁、镁、锰、钾、钠、锌8种元素全过程进行不确定度的影响因素分析,并对各不确定度分量进行计算。根据BS EN 15510:2017方法,采用电感耦合等离子体发射光谱法测定饲料中元素含量。...试验对电感耦合等离子体发射光谱法测定饲料中钙、铜、铁、镁、锰、钾、钠、锌8种元素全过程进行不确定度的影响因素分析,并对各不确定度分量进行计算。根据BS EN 15510:2017方法,采用电感耦合等离子体发射光谱法测定饲料中元素含量。测定结果均在标准物质证书给定的标准值与不确定度范围内,表明该结果准确可靠。测量不确定度主要来自标准工作曲线拟合产生的不确定度和重复性试验不确定度。展开更多
基金Project (No. 60337030) partly supported by the National NaturalScience Foundation of China
文摘Shaft alignment is an important technique during installation and maintenance of a rotating machine. A high-precision laser alignment system has been designed with dual PSDs (Position Sensing Detector) to change traditional manual way of shaft alignment and to make the measurement easier and more accurate. The system is comprised of two small measuring units (laser transmitter and detector) and a PDA (Personal Digital Assistant) with measurement software. The laser alignment system with dual PSDs was improved on a single PSD system, and yields higher measurement accuracy than the previous design, and has been successful for designing and implements actual shaft alignment. In the system, the range of offset measurement is ±4 mm, and the resolution is 1.5 μm, with accuracy being less than 2 μm.
基金Supported by the Key Project of Science and Technology Plan of Hunan Province(2012FJ2002)Science and Technology Committee of Hengyang(2013KG77)the Construct Program of the Key Discipline in Hunan Province
文摘A new dinuclear manganese complex [Mn2（L）2（2,2＇-bipy）2（H2O）512·3H2O has been synthesized with MnSO4·H2O, 2,2＇-bibenzoic acid （H2L） and 2,2＇-bipyridine（2,2＇-bipy） in the mixed solvent ethanol and water. It crystallizes in monoclinic, space group Pi with a = 9.9944（10）, b = 21.939（2）, c = 25.628（3） A, a = 108.429（3）, β = 100.613（4）, 7 = 102.821（3）°, V = 4997.9（9） A3, Dc= 1.355 g/cm^3, Z = 2, F（000） = 2108, GOOF = 1.074, the R= 0.0626 and wR= 0.1531. The structure of the complex contains two [Mn2（L）2（2,2＇-bipy）2] units, ten coordinated H2O molecules and three uncoordinated H2O molecules. The fluorescence, thermal stability and magnetic properties of the complex were investigated.
基金Supported by Hunan Provincial Natural Science Foundation of China(2019JJ60021)the Scientific Research Found of Hunan Provincial Education Department of China(17A049,17C0226)Industry and Research Key Project of Hengyang City(2018KJ016)
文摘Two new cobalt（Ⅱ）complexes[Co2（2,2?-bipy）2（dpa）2（H2O）5]·4H2O（1）and Co（2,2?-bipy）3（SO4）]·7.5H2O（2）have been synthesized with diaphonic acid（H2dpa）and 2,2?-bipyridine（2,2?-bipy）as ligands.In 1,two neighboring cobalt（Ⅱ）ions are linked together by one bridging diaphonic acid group,forming an asymmetric dinuclear structure.1 crystallizes in triclinic,space group ■ with a=9.825（6）,b=13.007（8）,c=19.586（1）?,α=80.773（1）o,β=77.065（1）o,γ=85.902（1）o,Mr=431.4,V=2406.5（3）?3,Dc=1.48 g/cm3,Z=2,μ（MoKα）=0.767 mm-1,F（000）=1112,the final R=0.0379 and wR=0.0862.The central cobalt（Ⅱ）ions in 1 and 2 are coordinated with six atoms,forming distorted octahedral coordination geometry.The fluorescence and thermal stability properties of 1 and 2 are also reported.
基金Supported by Natural Science Foundation of Hunan Province(2019JJ60021)Industry and Research Key Project of Hengyang City(2019jhzx1093,2018kKJ016)。
文摘A new binuclear cage-like yttrium(Ⅲ)complex Y2(TMBA)6(phen)2(1)with yttrium nitrate,2,4,6-trimethylbenzoic acid(TMBA)and 1,10-phenanthroline(phen)was synthesized.It crystallizes in the triclinic space group P1 with a=11.9086(15),b=12.4843(17),c=14.2101(18)?,α=104.977(4),β=111.750(4),γ=95.874(5)o,V=1848.8(4)?3,Dc=1.363 g/cm3,Z=1,μ(Mo Ka)=1.627,F(000)=788,the final GOOF=1.039,R=0.0353 and w R=0.0826.The whole molecule consists of two yttrium ions bridged by four 2,4,6-trimethylbenzoic acid anions.The Y(Ⅲ)ion is coordinated by eight atoms to give a distorted square antiprism coordination geometry.The TG analysis and fluorescent properties of 1 were studied.
文摘Recent studies suggest that PRL-3 is involved in the metastasis of colorectal cancer, but the mechanism concerning that has not been well defined. This article expresses PRL-1, PRL-2, and PRL-3 and the catalytically inactive mutant forms of those enzymes in SW620 and SW480 cells, two human cell lines derived from non-metastatic cancer and metastatic colorectal cancer, respectively. While the expression of the native forms of PRLs promotes the spreading, adhesion, and proliferation of these cells, the expression of their mutant forms inhibits the earlier-mentioned processes. These data thus provide a cellular mechanism for the role of PRL-3 in tumor metastasis and suggest that all the three PRLs have similar functions.
文摘试验对电感耦合等离子体发射光谱法测定饲料中钙、铜、铁、镁、锰、钾、钠、锌8种元素全过程进行不确定度的影响因素分析,并对各不确定度分量进行计算。根据BS EN 15510:2017方法,采用电感耦合等离子体发射光谱法测定饲料中元素含量。测定结果均在标准物质证书给定的标准值与不确定度范围内,表明该结果准确可靠。测量不确定度主要来自标准工作曲线拟合产生的不确定度和重复性试验不确定度。
