This paper analyzed the consistency of some parameters of soils in the literature and experimental results from fall cone test and its application to soil plasticity classification.Over 500 data from both literatures ...This paper analyzed the consistency of some parameters of soils in the literature and experimental results from fall cone test and its application to soil plasticity classification.Over 500 data from both literatures and experiments using fall cone and Casagrande methods were compiled to assess the relationships among specified water content,cone penetration index ebT,and plasticity angle eaT of finegrained soils.The results indicate that no unique correlation exists among b,liquid limit of the fall cone test(LLc)and a.The water content at 1 mm cone penetration eC0T correlates well with b,plasticity ratio eRpT(i.e.the ratio of plastic limit to liquid limit),and a.Finally,the potential of using the btan a diagram to classify soil plasticity was also discussed.展开更多
目的:分析计时起立-行走测试(TUGT)对老年2型糖尿病周围神经病变病人跌倒风险的评估价值。方法:回顾性分析2020年1月—2022年12月在我院内分泌科纳入治疗的2型糖尿病周围神经病变病人120例为研究对象,收集病人一般资料、TUGT测试结果,采...目的:分析计时起立-行走测试(TUGT)对老年2型糖尿病周围神经病变病人跌倒风险的评估价值。方法:回顾性分析2020年1月—2022年12月在我院内分泌科纳入治疗的2型糖尿病周围神经病变病人120例为研究对象,收集病人一般资料、TUGT测试结果,采用SPSS 22.0、R Studio 1.4.1103进行联合数据分析,研究相关性和预测价值。结果:本研究纳入的120例病人均顺利完成TUGT测试,完成率为100%,数据收集率为100%。所有病人TUGT时间为(16.03±3.29)s。Spearman相关性分析结果显示,TUGT时间与跌倒史、性别之间呈正相关(P<0.05);TUGT时间与2型糖尿病病程、合并周围神经病变病程、年龄之间无明显相关关系。TUGT时间用于预测老年2型糖尿病周围神经病变病人跌倒风险的最佳临界值为14.19 s,受试者工作特征曲线(ROC)曲线下面积(AUC)值为0.773,敏感度为86.29%,特异度为67.16%。结论:跌倒史、性别是影响老年2型糖尿病周围神经病变病人TUGT时间的危险因素,同时,TUGT时间对老年2型糖尿病周围神经病变病人跌倒具有良好的预测价值。展开更多
In marine engineering, the strength of a submarine sediment is an indispensable parameter for assessment of construction. In this study, a free-fall cone penetrator named IPen was developed to realize a rapid and effi...In marine engineering, the strength of a submarine sediment is an indispensable parameter for assessment of construction. In this study, a free-fall cone penetrator named IPen was developed to realize a rapid and efficient measurement of sediment strength. The equipment is characterized by modular design and self-contained data acquisition. It is equipped with an acceleration sensor, a water pressure sensor, and a piezocone penetration test(CPTu) probe. It is designed to be released from near seabed surface with a releaser and then fall freely to provide a higher penetration velocity. Its maximum working depth is approximately 2500 m and maximum penetration depth is approximately 3 m. To derive the correlation between penetration resistance and sediment strength, a calibrator was devised to determine the penetration-rate factor. In addition, the factor applicable to in situ test points was determined in laboratory experiments. In June 2016, the IPen was tested in situ in the South Yellow Sea, China, during a shared voyage funded by the National Science Foundation. Meanwhile, undisturbed column samples were collected for laboratory tests. Based on the in situ test results, it was demonstrated that the IPen could accurately record the working states of various sensors during the freely falling course. IPen test results reliably reflected the sediment strength at all the testing points when compared with laboratory calibration tests, in situ vane tests and penetration tests, laboratory penetration tests, and unconsolidated and undrained triaxial compression tests.展开更多
文摘This paper analyzed the consistency of some parameters of soils in the literature and experimental results from fall cone test and its application to soil plasticity classification.Over 500 data from both literatures and experiments using fall cone and Casagrande methods were compiled to assess the relationships among specified water content,cone penetration index ebT,and plasticity angle eaT of finegrained soils.The results indicate that no unique correlation exists among b,liquid limit of the fall cone test(LLc)and a.The water content at 1 mm cone penetration eC0T correlates well with b,plasticity ratio eRpT(i.e.the ratio of plastic limit to liquid limit),and a.Finally,the potential of using the btan a diagram to classify soil plasticity was also discussed.
文摘目的:分析计时起立-行走测试(TUGT)对老年2型糖尿病周围神经病变病人跌倒风险的评估价值。方法:回顾性分析2020年1月—2022年12月在我院内分泌科纳入治疗的2型糖尿病周围神经病变病人120例为研究对象,收集病人一般资料、TUGT测试结果,采用SPSS 22.0、R Studio 1.4.1103进行联合数据分析,研究相关性和预测价值。结果:本研究纳入的120例病人均顺利完成TUGT测试,完成率为100%,数据收集率为100%。所有病人TUGT时间为(16.03±3.29)s。Spearman相关性分析结果显示,TUGT时间与跌倒史、性别之间呈正相关(P<0.05);TUGT时间与2型糖尿病病程、合并周围神经病变病程、年龄之间无明显相关关系。TUGT时间用于预测老年2型糖尿病周围神经病变病人跌倒风险的最佳临界值为14.19 s,受试者工作特征曲线(ROC)曲线下面积(AUC)值为0.773,敏感度为86.29%,特异度为67.16%。结论:跌倒史、性别是影响老年2型糖尿病周围神经病变病人TUGT时间的危险因素,同时,TUGT时间对老年2型糖尿病周围神经病变病人跌倒具有良好的预测价值。
基金funded by the National Natural Science Foundation of China (Nos. 41502265 and 41427803)the Key Research and Development Program of Shandong Province, China (No. 2016ZDJS09A03)+1 种基金Data acquisition and sample collections were supported by NSFC Open Research Cruise (Cruise Nos. NORC2016-01 and NORC2017-05)funded by Shiptime Sharing Project of NSFC
文摘In marine engineering, the strength of a submarine sediment is an indispensable parameter for assessment of construction. In this study, a free-fall cone penetrator named IPen was developed to realize a rapid and efficient measurement of sediment strength. The equipment is characterized by modular design and self-contained data acquisition. It is equipped with an acceleration sensor, a water pressure sensor, and a piezocone penetration test(CPTu) probe. It is designed to be released from near seabed surface with a releaser and then fall freely to provide a higher penetration velocity. Its maximum working depth is approximately 2500 m and maximum penetration depth is approximately 3 m. To derive the correlation between penetration resistance and sediment strength, a calibrator was devised to determine the penetration-rate factor. In addition, the factor applicable to in situ test points was determined in laboratory experiments. In June 2016, the IPen was tested in situ in the South Yellow Sea, China, during a shared voyage funded by the National Science Foundation. Meanwhile, undisturbed column samples were collected for laboratory tests. Based on the in situ test results, it was demonstrated that the IPen could accurately record the working states of various sensors during the freely falling course. IPen test results reliably reflected the sediment strength at all the testing points when compared with laboratory calibration tests, in situ vane tests and penetration tests, laboratory penetration tests, and unconsolidated and undrained triaxial compression tests.
