The formation of strath and strath terrace is closely related to tectonic uplift in the drainage basin. Based on the investigation of straths at Yandantu and Changcaogou on the eastern segment of the northern margin f...The formation of strath and strath terrace is closely related to tectonic uplift in the drainage basin. Based on the investigation of straths at Yandantu and Changcaogou on the eastern segment of the northern margin fault of Altun, and in combination with the paleoclimatic data, the tectonic uplift since late Epipleistocene as revealed by stream terraces at the two places is discussed. At Yandantu, three levels of stream terraces(T 1, T 2 and T 3)have developed since 16ka BP, where T 1, T 3 and T 2 are fill terraces and the buried major straths are exposed. The ages of three treads are dated to be about 16.1ka BP, 12.8ka BP and 6.2ka BP, respectively. The three terraces reflect three tectonic uplift events, while the ages of the treads represent the occurrence time of these events. The stream is still beveling the bedrock and widening the channel at present, and the modern strath is being generated. The uplift rate is 4.8～4.5mm/a since 16.1 ka BP in this area. From 12.8ka B.P to 6.2ka BP, The uplift rate was 6.4mm/a. The uplift rate is 3.1mm/a since 6.2ka BP. At Changcaogou, four levels of stream terraces(T 1, T 2, T 3 and T 1′)have developed since 7ka BP. All of them are fill terraces. There are buried straths under the deposits. The buried major strath is exposed on T 3 and T 2 and the minor strath on T 1′and T 1. The ages of treads of the three terraces (T 3, T 2 and T 1′) are 7 ka BP, 3 ka BP and 2.5 ka BP, respectively. The four terraces reflect two uplift events induced by tectonic activities. One occurred in about 7 ka BP, and the other in 3ka BP. The uplift rate is 5.9mm/a since 7.0 ka BP at Changcaogou. From 7ka BP to 3ka BP, the uplift rate was 7.0mm/a, and since 3ka BP till now, the uplift rate is 4.7 mm/a.展开更多
Objective: to observe the effect of liquid nitrogen cryotherapy on keloid. Methods: 102 patients with keloid who were treated in the outpatient department from July 2019 to September 2020 were taken as the research ob...Objective: to observe the effect of liquid nitrogen cryotherapy on keloid. Methods: 102 patients with keloid who were treated in the outpatient department from July 2019 to September 2020 were taken as the research object, 51 patients with medical record number odd number were taken as the control group, and 51 patients with double number were taken as the experimental group. Patients in the control group were given triamcinolone acetonide acetate local injection therapy, while patients in the experimental group were given triamcinolone acetonide acetate local injection + liquid nitrogen cryotherapy. The quality of scar recovery, treatment efficiency, scar width and area, recurrence rate of the two groups were compared. Results: before treatment, there was no significant difference in POSAS score and VSS score between the two groups (P > 0.05). After treatment, the POSAS score and VSS score of the experimental group were significantly lower than those of the control group (P < 0.05). The total effective rate of the experimental group was 96.08% higher than that of the control group was 84.31%, P<0.05 was statistically significant. The scar tissue width and scar area in the experimental group were significantly lower than those in the control group (P<0.05). The recurrence rate of the experimental group was 1.96% lower than that of the control group was 11.76%, P<0.05 with statistical significance. Conclusion: after the keloid is treated with liquid nitrogen freezing technique, the recovery effect of the patient is more ideal, the overall treatment efficiency is high, the width and area of the keloid are effectively reduced, the relapse rate in the later stage is low, and the keloid has good clinical application and popularization value.展开更多
文摘The formation of strath and strath terrace is closely related to tectonic uplift in the drainage basin. Based on the investigation of straths at Yandantu and Changcaogou on the eastern segment of the northern margin fault of Altun, and in combination with the paleoclimatic data, the tectonic uplift since late Epipleistocene as revealed by stream terraces at the two places is discussed. At Yandantu, three levels of stream terraces(T 1, T 2 and T 3)have developed since 16ka BP, where T 1, T 3 and T 2 are fill terraces and the buried major straths are exposed. The ages of three treads are dated to be about 16.1ka BP, 12.8ka BP and 6.2ka BP, respectively. The three terraces reflect three tectonic uplift events, while the ages of the treads represent the occurrence time of these events. The stream is still beveling the bedrock and widening the channel at present, and the modern strath is being generated. The uplift rate is 4.8～4.5mm/a since 16.1 ka BP in this area. From 12.8ka B.P to 6.2ka BP, The uplift rate was 6.4mm/a. The uplift rate is 3.1mm/a since 6.2ka BP. At Changcaogou, four levels of stream terraces(T 1, T 2, T 3 and T 1′)have developed since 7ka BP. All of them are fill terraces. There are buried straths under the deposits. The buried major strath is exposed on T 3 and T 2 and the minor strath on T 1′and T 1. The ages of treads of the three terraces (T 3, T 2 and T 1′) are 7 ka BP, 3 ka BP and 2.5 ka BP, respectively. The four terraces reflect two uplift events induced by tectonic activities. One occurred in about 7 ka BP, and the other in 3ka BP. The uplift rate is 5.9mm/a since 7.0 ka BP at Changcaogou. From 7ka BP to 3ka BP, the uplift rate was 7.0mm/a, and since 3ka BP till now, the uplift rate is 4.7 mm/a.
文摘Objective: to observe the effect of liquid nitrogen cryotherapy on keloid. Methods: 102 patients with keloid who were treated in the outpatient department from July 2019 to September 2020 were taken as the research object, 51 patients with medical record number odd number were taken as the control group, and 51 patients with double number were taken as the experimental group. Patients in the control group were given triamcinolone acetonide acetate local injection therapy, while patients in the experimental group were given triamcinolone acetonide acetate local injection + liquid nitrogen cryotherapy. The quality of scar recovery, treatment efficiency, scar width and area, recurrence rate of the two groups were compared. Results: before treatment, there was no significant difference in POSAS score and VSS score between the two groups (P > 0.05). After treatment, the POSAS score and VSS score of the experimental group were significantly lower than those of the control group (P < 0.05). The total effective rate of the experimental group was 96.08% higher than that of the control group was 84.31%, P<0.05 was statistically significant. The scar tissue width and scar area in the experimental group were significantly lower than those in the control group (P<0.05). The recurrence rate of the experimental group was 1.96% lower than that of the control group was 11.76%, P<0.05 with statistical significance. Conclusion: after the keloid is treated with liquid nitrogen freezing technique, the recovery effect of the patient is more ideal, the overall treatment efficiency is high, the width and area of the keloid are effectively reduced, the relapse rate in the later stage is low, and the keloid has good clinical application and popularization value.
