The olivine in basalt records much information about formation and evolution of basaltic magma,which may help to discriminate basalt tectonic settings.However,the viewpoint that olivine is connected with the tectonic ...The olivine in basalt records much information about formation and evolution of basaltic magma,which may help to discriminate basalt tectonic settings.However,the viewpoint that olivine is connected with the tectonic setting where it formed is controversial.To verify the hypothesis,we intend to discriminate the basalt tectonic settings by geochemical characteristics of olivine.The data mining technique is selected as an effective tool for this study,which is a new attempt in geochemical research.The geochemical data of olivine used is extracted from open-access and comprehensive petrological databases.The classification performance of Logistic regression classifier,Naïve Bayes,Random Forest and Multi-layer perception(MLP)algorithms is firstly compared under some constraints.The results of the basic experiment indicate that MLP has the highest classification accuracy of about 88%based on raw data,followed by Random Forest.But this does not fully prove the hypothesis is credible.Then,the crossvalidation method and other measurement criteria are integrated for scientific and in-depth comparative analysis.The advanced experiments mainly include the comparison of different data preprocessing methods,combinations of geochemical characteristics and sample data volumes.It turns out that chemical composition of olivine in basalt has the function of discriminating tectonic settings.展开更多
目的:探讨腹腔镜经胆囊管胆总管探查取石术(laparoscopic transcystic common bile duct exploration,LTCBDE)、腹腔镜胆总管探查取石一期缝合术(laparoscopic common bile duct exploration and primary suture,LBEPS)治疗胆总管结石...目的:探讨腹腔镜经胆囊管胆总管探查取石术(laparoscopic transcystic common bile duct exploration,LTCBDE)、腹腔镜胆总管探查取石一期缝合术(laparoscopic common bile duct exploration and primary suture,LBEPS)治疗胆总管结石的临床疗效及安全性。方法:选取2014年4月至2016年4月收治的100例胆总管结石患者,根据手术方案分为A组(n=50,行LBEPS)与B组(n=50,行LTCBDE);比较两组手术相关临床指标、结石残余率、结石复发率及术后并发症发生率。结果:B组术后24 h引流量、引流管拔除时间、住院时间、胆漏发生率均少于A组(P<0.05);两组手术时间、术中出血量、首次肛门排气时间、结石残余率、结石复发率及切口感染、胆道狭窄、再发黄疸发生率差异无统计学意义(P>0.05)。结论:相较LBEPS,LTCBDE治疗胆总管结石可有效减少引流量,缩短引流时间、总住院时间,有助于减少胆漏的发生。展开更多
基金This research was supported by the Tianjin Science Foundation for Distinguished Young Scientists of China[Grant No.17JCJQJC44000]the National Natural Science Foundation for Excellent Young Scientists of China[Grant No.51622904].
文摘The olivine in basalt records much information about formation and evolution of basaltic magma,which may help to discriminate basalt tectonic settings.However,the viewpoint that olivine is connected with the tectonic setting where it formed is controversial.To verify the hypothesis,we intend to discriminate the basalt tectonic settings by geochemical characteristics of olivine.The data mining technique is selected as an effective tool for this study,which is a new attempt in geochemical research.The geochemical data of olivine used is extracted from open-access and comprehensive petrological databases.The classification performance of Logistic regression classifier,Naïve Bayes,Random Forest and Multi-layer perception(MLP)algorithms is firstly compared under some constraints.The results of the basic experiment indicate that MLP has the highest classification accuracy of about 88%based on raw data,followed by Random Forest.But this does not fully prove the hypothesis is credible.Then,the crossvalidation method and other measurement criteria are integrated for scientific and in-depth comparative analysis.The advanced experiments mainly include the comparison of different data preprocessing methods,combinations of geochemical characteristics and sample data volumes.It turns out that chemical composition of olivine in basalt has the function of discriminating tectonic settings.
文摘目的:探讨腹腔镜经胆囊管胆总管探查取石术(laparoscopic transcystic common bile duct exploration,LTCBDE)、腹腔镜胆总管探查取石一期缝合术(laparoscopic common bile duct exploration and primary suture,LBEPS)治疗胆总管结石的临床疗效及安全性。方法:选取2014年4月至2016年4月收治的100例胆总管结石患者,根据手术方案分为A组(n=50,行LBEPS)与B组(n=50,行LTCBDE);比较两组手术相关临床指标、结石残余率、结石复发率及术后并发症发生率。结果:B组术后24 h引流量、引流管拔除时间、住院时间、胆漏发生率均少于A组(P<0.05);两组手术时间、术中出血量、首次肛门排气时间、结石残余率、结石复发率及切口感染、胆道狭窄、再发黄疸发生率差异无统计学意义(P>0.05)。结论:相较LBEPS,LTCBDE治疗胆总管结石可有效减少引流量,缩短引流时间、总住院时间,有助于减少胆漏的发生。
