Based on the Tibet Autonomous Region's statistic yearbooks and the data fromthe two household surveys in 2002 and 2004, this paper has comprehensively analyzed the pattern ofchanges on the farmers and herdsmen'...Based on the Tibet Autonomous Region's statistic yearbooks and the data fromthe two household surveys in 2002 and 2004, this paper has comprehensively analyzed the pattern ofchanges on the farmers and herdsmen's income sources in the Tibet Autonomous Region since 1990 withthe main findings as follows; (1) The change of income from the labor payment is the fastest; (2)There is no regular pattern of income variation for the household economic activities, the farmersand herdsmen's household incomegeneration projects are impacted by the elements like prices andreturns, and there is a lack of appropriate direction; (3) The income structure of labor paymentshows that the income from the farmers and herdsmen working outside grows fastest; (4) The incomefrom the farmers and herdsmen's labor payment correlate positively to their net income per capita;(5) From the perspective of the variation by region, labor payment income has changed fastest in thecounties of Rutok, Nyerong and Khangmar comparedthe data from the household survey in 2002 withthat of 2004.展开更多
We present the scheme of the structure of grading a resistor-heated system ofwarm compaction in powder metallurgy. The structure has the first heater and the second heater thatare heated by electrical tubes. Powder is...We present the scheme of the structure of grading a resistor-heated system ofwarm compaction in powder metallurgy. The structure has the first heater and the second heater thatare heated by electrical tubes. Powder is heated in turn in the first heater and the second heater,where there is the mass fluidity of powder under gravity. The dimensions of the first heater andthe second heater were calculated from the Fourier equation of heat conduction, and the boundarycondition was constant temperature. The drawings of the first heater, the second heater and thepowder-delivering device were given. The structure of the heat equipment is simple and easy tomanufacture. Finally, an exact warm compaction press system HGWY- II was developed for the heatingsystem.展开更多
A study on the mathematical modeling of the two dimensional, time-dependentvariation of bottom topography caused by the spur dikes of the deep water navigation channel projectin the Yangtze estuary is reported. The hy...A study on the mathematical modeling of the two dimensional, time-dependentvariation of bottom topography caused by the spur dikes of the deep water navigation channel projectin the Yangtze estuary is reported. The hydro-dynamic flows are computed using the DELFT3D whichserves as the base of computation of sediment transport and bottom deformation. A model of finesediment transport is developed and implemented in an orthogonal curvilinear coordinate system bythe finite difference method. Using the observed water depth of the North Channel of Yangtze estuaryfrom 2001 to 2002, the model is calibrated and validated to determine the parameters in thesediment model. The computational results of the changes of the bed in the North Channel induced bythe spur dikes coincide with the measured data except the area near the structures.展开更多
Manganese enhanced magnetic resonance im- aging (MRI) is a novel neuroimaging technique that can be used in vivo to trace neuronal tract and to study brain func- tions dynamically. In this study, manganese enhanced MR...Manganese enhanced magnetic resonance im- aging (MRI) is a novel neuroimaging technique that can be used in vivo to trace neuronal tract and to study brain func- tions dynamically. In this study, manganese enhanced MRI was used to trace the neuronal tracts between the laminar structures of the olfactory bulb (OB) in rat and to study the so-called “calcium overload” phenomenon in a rat model of cerebral ischemia. High spatial resolution images of the OB were obtained and used to measure the transportation rate of Mn2+ among the laminar structures of the OB, which was shown to be approximately 0.2 mm/h under resting condition. In the rat focal ischemia study, it was found that the total area of brain regions with Mn2+ accumulation (representing brain regions with calcium overload) was only 55%±15% of the area of the ischemic brain regions shown by diffu- sion-weighted imaging (DWI). Manganese enhanced MRI might be more accurate than DWI in detecting the ischemic core at the early stage of experimental cerebral ischemia.展开更多
[目的]比较Wiltse入路与经皮椎弓根固定治疗单节段胸腰段骨折的疗效。[方法]回顾性分析2013年1月—2020年12月本科收治的无神经损伤胸腰段骨折97例患者的临床资料。根据医患沟通结果,51例采用Wiltse入路(Wiltse组),46例采用经皮入路(经...[目的]比较Wiltse入路与经皮椎弓根固定治疗单节段胸腰段骨折的疗效。[方法]回顾性分析2013年1月—2020年12月本科收治的无神经损伤胸腰段骨折97例患者的临床资料。根据医患沟通结果,51例采用Wiltse入路(Wiltse组),46例采用经皮入路(经皮组)。比较两组围手术期、随访及影像结果。[结果]两组患者均顺利完成手术。Wiltse组手术时间[(75.5±8.6)min vs(103.5±9.0)min,P<0.001]、术中透视次数[(6.4±0.9)次vs(15.4±1.6)次,P<0.001]、住院费用[(4.3±0.3)万元vs(5.0±0.2)万元,P<0.001]显著优于经皮组,但前者的切口总长度显著大于后者[(7.0±0.7)cm vs(6.3±0.5)cm,P<0.001]。术后第1 d Wiltse组CK水平显著低于经皮组[(155.7±9.9)U/L vs(174.3±15.8)U/L,P<0.001]。随时间推移,两组术后腰痛VAS、ODI评分均显著减少(P<0.05),术后3 d经皮组ODI评分显著少于Wiltse组(P<0.05)。影像方面,两组患者置钉准确率比较差异无统计学意义(P>0.05)。与术前相比,两组患者术后各时间点局部后凸Cobb角均显著减小(P<0.05),伤椎前缘高度百分比显著增加(P<0.05)。术后3 d、内固定取出前、后,Wiltse组局部后凸Cobb角均显著小于经皮组(P<0.05),术后3 d Wiltse组伤椎前缘高度百分比显著大于经皮组(P<0.05)。[结论]Wiltse入路及经皮内固定术均是胸腰段骨折微创术式,可获得满意临床疗效。相比之下,Wiltse入路手术耗时更短、医患射线暴露更少、住院费用更低,改善胸腰段后凸角及恢复伤椎高度更满意。展开更多
文摘Based on the Tibet Autonomous Region's statistic yearbooks and the data fromthe two household surveys in 2002 and 2004, this paper has comprehensively analyzed the pattern ofchanges on the farmers and herdsmen's income sources in the Tibet Autonomous Region since 1990 withthe main findings as follows; (1) The change of income from the labor payment is the fastest; (2)There is no regular pattern of income variation for the household economic activities, the farmersand herdsmen's household incomegeneration projects are impacted by the elements like prices andreturns, and there is a lack of appropriate direction; (3) The income structure of labor paymentshows that the income from the farmers and herdsmen working outside grows fastest; (4) The incomefrom the farmers and herdsmen's labor payment correlate positively to their net income per capita;(5) From the perspective of the variation by region, labor payment income has changed fastest in thecounties of Rutok, Nyerong and Khangmar comparedthe data from the household survey in 2002 withthat of 2004.
文摘We present the scheme of the structure of grading a resistor-heated system ofwarm compaction in powder metallurgy. The structure has the first heater and the second heater thatare heated by electrical tubes. Powder is heated in turn in the first heater and the second heater,where there is the mass fluidity of powder under gravity. The dimensions of the first heater andthe second heater were calculated from the Fourier equation of heat conduction, and the boundarycondition was constant temperature. The drawings of the first heater, the second heater and thepowder-delivering device were given. The structure of the heat equipment is simple and easy tomanufacture. Finally, an exact warm compaction press system HGWY- II was developed for the heatingsystem.
文摘A study on the mathematical modeling of the two dimensional, time-dependentvariation of bottom topography caused by the spur dikes of the deep water navigation channel projectin the Yangtze estuary is reported. The hydro-dynamic flows are computed using the DELFT3D whichserves as the base of computation of sediment transport and bottom deformation. A model of finesediment transport is developed and implemented in an orthogonal curvilinear coordinate system bythe finite difference method. Using the observed water depth of the North Channel of Yangtze estuaryfrom 2001 to 2002, the model is calibrated and validated to determine the parameters in thesediment model. The computational results of the changes of the bed in the North Channel induced bythe spur dikes coincide with the measured data except the area near the structures.
文摘Manganese enhanced magnetic resonance im- aging (MRI) is a novel neuroimaging technique that can be used in vivo to trace neuronal tract and to study brain func- tions dynamically. In this study, manganese enhanced MRI was used to trace the neuronal tracts between the laminar structures of the olfactory bulb (OB) in rat and to study the so-called “calcium overload” phenomenon in a rat model of cerebral ischemia. High spatial resolution images of the OB were obtained and used to measure the transportation rate of Mn2+ among the laminar structures of the OB, which was shown to be approximately 0.2 mm/h under resting condition. In the rat focal ischemia study, it was found that the total area of brain regions with Mn2+ accumulation (representing brain regions with calcium overload) was only 55%±15% of the area of the ischemic brain regions shown by diffu- sion-weighted imaging (DWI). Manganese enhanced MRI might be more accurate than DWI in detecting the ischemic core at the early stage of experimental cerebral ischemia.
文摘[目的]比较Wiltse入路与经皮椎弓根固定治疗单节段胸腰段骨折的疗效。[方法]回顾性分析2013年1月—2020年12月本科收治的无神经损伤胸腰段骨折97例患者的临床资料。根据医患沟通结果,51例采用Wiltse入路(Wiltse组),46例采用经皮入路(经皮组)。比较两组围手术期、随访及影像结果。[结果]两组患者均顺利完成手术。Wiltse组手术时间[(75.5±8.6)min vs(103.5±9.0)min,P<0.001]、术中透视次数[(6.4±0.9)次vs(15.4±1.6)次,P<0.001]、住院费用[(4.3±0.3)万元vs(5.0±0.2)万元,P<0.001]显著优于经皮组,但前者的切口总长度显著大于后者[(7.0±0.7)cm vs(6.3±0.5)cm,P<0.001]。术后第1 d Wiltse组CK水平显著低于经皮组[(155.7±9.9)U/L vs(174.3±15.8)U/L,P<0.001]。随时间推移,两组术后腰痛VAS、ODI评分均显著减少(P<0.05),术后3 d经皮组ODI评分显著少于Wiltse组(P<0.05)。影像方面,两组患者置钉准确率比较差异无统计学意义(P>0.05)。与术前相比,两组患者术后各时间点局部后凸Cobb角均显著减小(P<0.05),伤椎前缘高度百分比显著增加(P<0.05)。术后3 d、内固定取出前、后,Wiltse组局部后凸Cobb角均显著小于经皮组(P<0.05),术后3 d Wiltse组伤椎前缘高度百分比显著大于经皮组(P<0.05)。[结论]Wiltse入路及经皮内固定术均是胸腰段骨折微创术式,可获得满意临床疗效。相比之下,Wiltse入路手术耗时更短、医患射线暴露更少、住院费用更低,改善胸腰段后凸角及恢复伤椎高度更满意。
