目的探讨全血血栓弹力图(WB-TEG)仪及其配套试剂用于血浆血栓弹力图(P-TEG)试验的可行性及其正常人P-TEG特征。方法选取17名健康志愿者用WB-TEG仪及其配套试剂检测WB-TEG,并和其P-TEG检测结果比较;分析17名正常人P-TEG的特征。选择3种...目的探讨全血血栓弹力图(WB-TEG)仪及其配套试剂用于血浆血栓弹力图(P-TEG)试验的可行性及其正常人P-TEG特征。方法选取17名健康志愿者用WB-TEG仪及其配套试剂检测WB-TEG,并和其P-TEG检测结果比较;分析17名正常人P-TEG的特征。选择3种血小板计数(Plt)的血浆标本各7例,3种纤维蛋白原浓度(Fib)的血浆标本7、6、4例做P-TEG,观察Plt、Fib对P-TEG试验的影响。结果17正常人WB-TEG与P-TEG各项参数均值比较:R时、MA距无明显差异(P>0.05),K(min)为1.71±0.47 vs 1.07±0.45、A(°)为66.1±5.41 vs 75.59±5.77、CI值为0.9±1.8 vs 2.52±2.58(均为P<0.05)。正常人P-TEG各项参数基本在WB-TEG 95%CI范围内,但K(时)﹑A(角)和CI值有明显差异(P<0.05)。血浆中Plt(×10^(11)/L)≥2.5时P-TEG的MA距较正常(人)值明显延长(P<0.05),Plt(×10^(11)/L)为6.0~12.0时P-TEG的MA距、CI值明显减小(P<0.05);血浆中Fib(g/L)为6.4~6.91时PTEG的R时、K时延长并A角、MA距和CI值减小(P<0.05),<1时R时、A角和MA距明显降低(P<0.05)(K时和CI值检测不出)。结论WB-TEG仪及配套试剂可以用于P-PEG试验;开展TEG试验宜结合各自实验室的条件建立相应的TEG参数参考值。展开更多
This paper aims at providing a scientific basis for unifying the normal reference value standards of red blood cell count of Chinese presenile men. The paper, using microscopical counting method, studies the relations...This paper aims at providing a scientific basis for unifying the normal reference value standards of red blood cell count of Chinese presenile men. The paper, using microscopical counting method, studies the relationship between the normal reference values of 38,061 samples of red blood cell count of presenile men and eight geographical factors in 297 units in China. It is found that the correlation of geographical factors and the normal reference value of red blood cell count of presenile men is quite significant （F=303.00, P=-0.000）. By using the method of stepwise regression analysis, one regression equation is inferred. It is concluded that if geographical data are obtained in a certain area, the normal reference value of red blood cell count of presenile men in this area can be reckoned by using the regression analysis. Furthermore, according to the geographical factors, China can be divided into eight regions： Northeast China Region, North China Region, Shanxi-Shaanxi-Irmer Mongolia Region, Middle and Lower Reaches of the Changjiang River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.展开更多
The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.T...The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.The results show that through the surface dissolution the adsorption rate constant for ilmenite increases from 5.272 to 8.441 mol/(g·min)while it decreases for Ol-Px,Tr-Cch and quartz from 6.332,7.309 and 7.774 mol/(g·min)to 5.034,6.223 and 7.371 mol/(g·min),respectively.Also,the flotation experiments on a binary mixture of minerals indicate that after surface dissolution the values of modified rate constant for ilmenite flotation from Ol-Px,Tr-Cch and quartz are enhanced from 36.15,36.52 and 47.86 min-1 to 41.72,45.78 and 56.24 min-1,respectively.This results in the improvement of kinetic selectivity index(SI)in the separation of treated ilmenite from gangue minerals.As evidenced by ICP-MS analysis,the decrease of kinetic parameters for gangue minerals can be due to the removal of Fe^2+,Ca^2+and Mg^2+ions from their surfaces,which results in the lack of enough active sites to interact with collector species.As confirmed by contact angle measurements,this prevents the formation of a stable hydrophobic layer on the minerals surfaces for creating stable attachments between minerals and bubbles.Generally,the improvement of ilmenite flotation kinetics has a negative correlation with the iron content in its accompanied gangue minerals.展开更多
Distribution systems operators are often confronted with declined power quality, which can cause substantial economical losses. The problem analyzed in paper concerns thyristor controlled direct current motor used for...Distribution systems operators are often confronted with declined power quality, which can cause substantial economical losses. The problem analyzed in paper concerns thyristor controlled direct current motor used for ski-lift in ski resort as a source of disturbances with negative impact on sensitive electric equipment, which is then unable to operate correctly. To solve mentioned problems, series of measurements of voltage quality parameters were carried out according to the respective valid standards. Crucial power quality parameters necessary for parallel power active filter design were then analyzed. Power active filter compensates power factor and filters characteristic current harmonics. After power active filter was put into operation, power quality problems were eliminated. Payback period is estimated up to four years.展开更多
In this paper, we establish the product formula for the fixed point index on product cone, andthen, as applications, consider the existence, nonexistence and multiplicity of positive solutions for a second-order ordin...In this paper, we establish the product formula for the fixed point index on product cone, andthen, as applications, consider the existence, nonexistence and multiplicity of positive solutions for a second-order ordinary differential system with parameters. The discussion is based on the product formula and thefundamental properties of the fixed point index.展开更多
文摘目的探讨全血血栓弹力图(WB-TEG)仪及其配套试剂用于血浆血栓弹力图(P-TEG)试验的可行性及其正常人P-TEG特征。方法选取17名健康志愿者用WB-TEG仪及其配套试剂检测WB-TEG,并和其P-TEG检测结果比较;分析17名正常人P-TEG的特征。选择3种血小板计数(Plt)的血浆标本各7例,3种纤维蛋白原浓度(Fib)的血浆标本7、6、4例做P-TEG,观察Plt、Fib对P-TEG试验的影响。结果17正常人WB-TEG与P-TEG各项参数均值比较:R时、MA距无明显差异(P>0.05),K(min)为1.71±0.47 vs 1.07±0.45、A(°)为66.1±5.41 vs 75.59±5.77、CI值为0.9±1.8 vs 2.52±2.58(均为P<0.05)。正常人P-TEG各项参数基本在WB-TEG 95%CI范围内,但K(时)﹑A(角)和CI值有明显差异(P<0.05)。血浆中Plt(×10^(11)/L)≥2.5时P-TEG的MA距较正常(人)值明显延长(P<0.05),Plt(×10^(11)/L)为6.0~12.0时P-TEG的MA距、CI值明显减小(P<0.05);血浆中Fib(g/L)为6.4~6.91时PTEG的R时、K时延长并A角、MA距和CI值减小(P<0.05),<1时R时、A角和MA距明显降低(P<0.05)(K时和CI值检测不出)。结论WB-TEG仪及配套试剂可以用于P-PEG试验;开展TEG试验宜结合各自实验室的条件建立相应的TEG参数参考值。
基金Under the auspices of the National Natural Science Foundation of China (No. 40371004)
文摘This paper aims at providing a scientific basis for unifying the normal reference value standards of red blood cell count of Chinese presenile men. The paper, using microscopical counting method, studies the relationship between the normal reference values of 38,061 samples of red blood cell count of presenile men and eight geographical factors in 297 units in China. It is found that the correlation of geographical factors and the normal reference value of red blood cell count of presenile men is quite significant （F=303.00, P=-0.000）. By using the method of stepwise regression analysis, one regression equation is inferred. It is concluded that if geographical data are obtained in a certain area, the normal reference value of red blood cell count of presenile men in this area can be reckoned by using the regression analysis. Furthermore, according to the geographical factors, China can be divided into eight regions： Northeast China Region, North China Region, Shanxi-Shaanxi-Irmer Mongolia Region, Middle and Lower Reaches of the Changjiang River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.
文摘The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.The results show that through the surface dissolution the adsorption rate constant for ilmenite increases from 5.272 to 8.441 mol/(g·min)while it decreases for Ol-Px,Tr-Cch and quartz from 6.332,7.309 and 7.774 mol/(g·min)to 5.034,6.223 and 7.371 mol/(g·min),respectively.Also,the flotation experiments on a binary mixture of minerals indicate that after surface dissolution the values of modified rate constant for ilmenite flotation from Ol-Px,Tr-Cch and quartz are enhanced from 36.15,36.52 and 47.86 min-1 to 41.72,45.78 and 56.24 min-1,respectively.This results in the improvement of kinetic selectivity index(SI)in the separation of treated ilmenite from gangue minerals.As evidenced by ICP-MS analysis,the decrease of kinetic parameters for gangue minerals can be due to the removal of Fe^2+,Ca^2+and Mg^2+ions from their surfaces,which results in the lack of enough active sites to interact with collector species.As confirmed by contact angle measurements,this prevents the formation of a stable hydrophobic layer on the minerals surfaces for creating stable attachments between minerals and bubbles.Generally,the improvement of ilmenite flotation kinetics has a negative correlation with the iron content in its accompanied gangue minerals.
文摘Distribution systems operators are often confronted with declined power quality, which can cause substantial economical losses. The problem analyzed in paper concerns thyristor controlled direct current motor used for ski-lift in ski resort as a source of disturbances with negative impact on sensitive electric equipment, which is then unable to operate correctly. To solve mentioned problems, series of measurements of voltage quality parameters were carried out according to the respective valid standards. Crucial power quality parameters necessary for parallel power active filter design were then analyzed. Power active filter compensates power factor and filters characteristic current harmonics. After power active filter was put into operation, power quality problems were eliminated. Payback period is estimated up to four years.
基金supported by Natural Science Foundation in Jiangsu Province (Grant Nos.10KJB110004, 08KJD110010)National Natural Science Foundation of China (Grant Nos. 10971046, 10831005, 10671195)China Postdoctoral Science Foundation (Grant Nos. 20090450601)
文摘In this paper, we establish the product formula for the fixed point index on product cone, andthen, as applications, consider the existence, nonexistence and multiplicity of positive solutions for a second-order ordinary differential system with parameters. The discussion is based on the product formula and thefundamental properties of the fixed point index.
