It has been found that Ca-treated liquid steel can be cast at a lower superheat. To ascertain the reason for the improved castability of Ca-treated liquid steel and to find the optimal range of calcium content, the be...It has been found that Ca-treated liquid steel can be cast at a lower superheat. To ascertain the reason for the improved castability of Ca-treated liquid steel and to find the optimal range of calcium content, the behavior of calcium in liquid steel was studied in terms of the relationship between the calcium content and solid ratio of inclusions. The relationship between the calcium content and solid ratio of inclusions was obtained by means of the classification of nonmetallic inclusions in solid and liquid steels at casting temperature according to the Al2O3-CaO-SiO2 phase diagram. The optimum calcium content should be 17-23 ppm.展开更多
The samples of the C-S-H series were synthesized by hydrothermal reaction of fumed silica, CaO and deionized water at initial C/S ratios between 1.0-1.7. Phase composition and structural and morphology characteristics...The samples of the C-S-H series were synthesized by hydrothermal reaction of fumed silica, CaO and deionized water at initial C/S ratios between 1.0-1.7. Phase composition and structural and morphology characteristics of C-S-H samples were analyzed by XRD, IR and SEM. The experimental results showed that the d-spacing of （002）, （110） and （020） decreased, the d-spacing of （200） increased, and the d-spacing of （310） varied randomly, the polymerization of silica tetrahedra of C-S-H decreased, and morphology of C-S-H samples varied from sheet shapes to long reticular fibers as C/S ratio increased.展开更多
A pot experiment was conducted to investigate the effect of cow dung, rice husks, calcium chloride and gypsum on soil reclamation and compare the effect of organic and inorganic amendments on soil reclamation during t...A pot experiment was conducted to investigate the effect of cow dung, rice husks, calcium chloride and gypsum on soil reclamation and compare the effect of organic and inorganic amendments on soil reclamation during the period of 5th March to 20th April, 2017. The experiment was laid to fit a completely randomized design (CRD) with seven treatments [Reference soil (T0), Cow dung (T1), Rice husk (T2), Gypsum (T3), Calcium chloride (T4), Cow dung + Rice husk (T5) and Gypsum + Calcium chloride (T6)] each having three replications for this experiment. After incubation (45 days), the laboratory investigation was carried out in the Soil, Water and Environment Discipline, Khulna University, Khulna, Bangladesh. Results indicate that the individual or combined effect of gypsum (T3) was more effective in changing EC and SAR. Gypsum application in combination with calcium chloride (T6) improved the soil chemical properties by reducing the EC. Among the treatment, calcium chloride (T4) had a remarkable effect in reducing sodium adsorption ratio and gypsum had a remarkable effect in reducing pH. Cow dung (T1), rice husk (T2), combination of cow dung and rice husk (T5) were less effective to reduce EC, pH and SAR. It’s measured for soils of different soil amendments varied significantly展开更多
To estimate the rate of excretion of urinary calcium, a 24-hour sample of urine is required and this is not always easy to collect accurately in infant and children. So, random urine calcium to creatinine ratio (Ca/Cr...To estimate the rate of excretion of urinary calcium, a 24-hour sample of urine is required and this is not always easy to collect accurately in infant and children. So, random urine calcium to creatinine ratio (Ca/Cr ratio) has been developed. But as the ratio varies worldwide, reference values of the parameter in paediatric population are not developed. To determine reference value, the present study was conducted in healthy paediatric population in Burdwan district, West Bengal. This study was performed on 693 healthy paediatric subjects, aged between 3 months to 18 years and divided into five groups. Early morning non-fasting urine samples from all study groups were analyzed for Ca/Cr ratio. A negative correlation was observed between age and urinary Ca/Cr ratio, but there was no significant difference of urinary Ca/Cr ratio between two sexes. Considering 97.5th percentile of the underlying distribution of values as the upper limit of reference range, upper reference values of urinary Ca/Cr ratio for age groups展开更多
In this paper, a high calcium high sulfate ash as the main material, adding fly ash, lime, cement, gypsum and some modifiers to prepare autoclaved aerated concrete. The products complies with the technical requirement...In this paper, a high calcium high sulfate ash as the main material, adding fly ash, lime, cement, gypsum and some modifiers to prepare autoclaved aerated concrete. The products complies with the technical requirements of GB/T11968-2006. This paper also studies the influence of the physical methods and water ratio on autoclaved aerated concrete by high calcium high sulfate ash aerated concrete. The best ratio of water and Grinding time were found in practice study.展开更多
目的探讨快速序贯器官衰竭评分(quick sequential organ failure assessment,qSOFA)联合红细胞分布宽度与血钙比值(red blood cell distribution width-to-serum calcium ratio,RDC)对重症急性胰腺炎(severe acute pancreatitis,SAP)的...目的探讨快速序贯器官衰竭评分(quick sequential organ failure assessment,qSOFA)联合红细胞分布宽度与血钙比值(red blood cell distribution width-to-serum calcium ratio,RDC)对重症急性胰腺炎(severe acute pancreatitis,SAP)的预测价值。方法回顾性分析2018年6月~2022年10月徐州医科大学附属医院收治的319例急性胰腺炎患者的临床资料,根据病情严重程度分为非SAP组(n=260)和SAP组(n=59)。所有患者均于入院24h内进行血样采集并检测相应血液学指标,并于24h内进行qSOFA与急性胰腺严重床旁指数(bedside index for severity in acute pancreatitis,BISAP)评分。比较两组间的临床资料并进行Logistic回归分析危险因素。采用受试者工作特征(receiver operating characteristic,ROC)曲线评估qSOFA评分、RDC及两者联合评分对SAP的预测效能,并与BISAP评分进行比较。结果多因素Logistic回归分析发现,RDC(OR=4.111,95%CI:2.053~8.231,P<0.05)和qSOFA(OR=9.732,95%CI:3.974~23.832,P<0.05)高评分是SAP的独立危险因素。联合评分及BISAP评分预测SAP的曲线下面积(area under the curve,AUC)分别为0.915(95%CI:0.872~0.959,P<0.001)、0.839(95%CI:0.782~0.896,P<0.001),敏感度分别为93.2%、66.1%,特异性分别为85.0%、86.2%。结论qSOFA评分、RDC均可预测SAP的发生,两者联合评分对SAP发生的预测效能更高,可用于早期识别SAP的发生并指导早期干预。展开更多
文摘It has been found that Ca-treated liquid steel can be cast at a lower superheat. To ascertain the reason for the improved castability of Ca-treated liquid steel and to find the optimal range of calcium content, the behavior of calcium in liquid steel was studied in terms of the relationship between the calcium content and solid ratio of inclusions. The relationship between the calcium content and solid ratio of inclusions was obtained by means of the classification of nonmetallic inclusions in solid and liquid steels at casting temperature according to the Al2O3-CaO-SiO2 phase diagram. The optimum calcium content should be 17-23 ppm.
基金Funded by the National Basic Research Program of China (973 Program) (No. 2009CB623201)the National Natural Science Foundation of China (No.51072150)
文摘The samples of the C-S-H series were synthesized by hydrothermal reaction of fumed silica, CaO and deionized water at initial C/S ratios between 1.0-1.7. Phase composition and structural and morphology characteristics of C-S-H samples were analyzed by XRD, IR and SEM. The experimental results showed that the d-spacing of （002）, （110） and （020） decreased, the d-spacing of （200） increased, and the d-spacing of （310） varied randomly, the polymerization of silica tetrahedra of C-S-H decreased, and morphology of C-S-H samples varied from sheet shapes to long reticular fibers as C/S ratio increased.
文摘A pot experiment was conducted to investigate the effect of cow dung, rice husks, calcium chloride and gypsum on soil reclamation and compare the effect of organic and inorganic amendments on soil reclamation during the period of 5th March to 20th April, 2017. The experiment was laid to fit a completely randomized design (CRD) with seven treatments [Reference soil (T0), Cow dung (T1), Rice husk (T2), Gypsum (T3), Calcium chloride (T4), Cow dung + Rice husk (T5) and Gypsum + Calcium chloride (T6)] each having three replications for this experiment. After incubation (45 days), the laboratory investigation was carried out in the Soil, Water and Environment Discipline, Khulna University, Khulna, Bangladesh. Results indicate that the individual or combined effect of gypsum (T3) was more effective in changing EC and SAR. Gypsum application in combination with calcium chloride (T6) improved the soil chemical properties by reducing the EC. Among the treatment, calcium chloride (T4) had a remarkable effect in reducing sodium adsorption ratio and gypsum had a remarkable effect in reducing pH. Cow dung (T1), rice husk (T2), combination of cow dung and rice husk (T5) were less effective to reduce EC, pH and SAR. It’s measured for soils of different soil amendments varied significantly
文摘To estimate the rate of excretion of urinary calcium, a 24-hour sample of urine is required and this is not always easy to collect accurately in infant and children. So, random urine calcium to creatinine ratio (Ca/Cr ratio) has been developed. But as the ratio varies worldwide, reference values of the parameter in paediatric population are not developed. To determine reference value, the present study was conducted in healthy paediatric population in Burdwan district, West Bengal. This study was performed on 693 healthy paediatric subjects, aged between 3 months to 18 years and divided into five groups. Early morning non-fasting urine samples from all study groups were analyzed for Ca/Cr ratio. A negative correlation was observed between age and urinary Ca/Cr ratio, but there was no significant difference of urinary Ca/Cr ratio between two sexes. Considering 97.5th percentile of the underlying distribution of values as the upper limit of reference range, upper reference values of urinary Ca/Cr ratio for age groups
文摘In this paper, a high calcium high sulfate ash as the main material, adding fly ash, lime, cement, gypsum and some modifiers to prepare autoclaved aerated concrete. The products complies with the technical requirements of GB/T11968-2006. This paper also studies the influence of the physical methods and water ratio on autoclaved aerated concrete by high calcium high sulfate ash aerated concrete. The best ratio of water and Grinding time were found in practice study.
文摘目的探讨快速序贯器官衰竭评分(quick sequential organ failure assessment,qSOFA)联合红细胞分布宽度与血钙比值(red blood cell distribution width-to-serum calcium ratio,RDC)对重症急性胰腺炎(severe acute pancreatitis,SAP)的预测价值。方法回顾性分析2018年6月~2022年10月徐州医科大学附属医院收治的319例急性胰腺炎患者的临床资料,根据病情严重程度分为非SAP组(n=260)和SAP组(n=59)。所有患者均于入院24h内进行血样采集并检测相应血液学指标,并于24h内进行qSOFA与急性胰腺严重床旁指数(bedside index for severity in acute pancreatitis,BISAP)评分。比较两组间的临床资料并进行Logistic回归分析危险因素。采用受试者工作特征(receiver operating characteristic,ROC)曲线评估qSOFA评分、RDC及两者联合评分对SAP的预测效能,并与BISAP评分进行比较。结果多因素Logistic回归分析发现,RDC(OR=4.111,95%CI:2.053~8.231,P<0.05)和qSOFA(OR=9.732,95%CI:3.974~23.832,P<0.05)高评分是SAP的独立危险因素。联合评分及BISAP评分预测SAP的曲线下面积(area under the curve,AUC)分别为0.915(95%CI:0.872~0.959,P<0.001)、0.839(95%CI:0.782~0.896,P<0.001),敏感度分别为93.2%、66.1%,特异性分别为85.0%、86.2%。结论qSOFA评分、RDC均可预测SAP的发生,两者联合评分对SAP发生的预测效能更高,可用于早期识别SAP的发生并指导早期干预。
