There are about 19 Neolithic Age sites and 120 Shang-Zhou dynasties sites in the western lakeshore of Chaohu Lake,Anhui Province,China.Based on sites data,topographic data,drainage maps,administrative maps and SPOT5 r...There are about 19 Neolithic Age sites and 120 Shang-Zhou dynasties sites in the western lakeshore of Chaohu Lake,Anhui Province,China.Based on sites data,topographic data,drainage maps,administrative maps and SPOT5 remote sensing data,spatial analysis methods were introduced into the archaeology of Chaohu Lake Basin with Geographic Information System(GIS).The spatial analysis methods include:1) Point Density Analysis with density model to acquire the shift of the sites;2) Distance Analysis to reveal the spatial structure of the sites;3) 3D Analysis based on Digital Elevation Model to get micro-geomorphologic features of the sites;and 4) Buffer Analysis to discover the relationship between the sites and rivers.The results indicate that the archaeological sites spread from the western lakeshore of Chaohu Lake gradually to the northwest,later to the south,and then symmetrically spread.Controlled by productive forces and other factors,ancient people preferred to reside in those places near water,or in plain and fertile land,which resulted in linear and decentralized distribution of the sites,and presented such disciplines as river valley directivity,terrace directivity and soil directivity.This paper indicates that the distribution of archaeological sites was influenced earlier by natural elements and later by human elements in the study period.The research is important for the integration of GIS and archaeology.展开更多
目的比较瑞马唑仑与丙泊酚两种麻醉药对脑血管内手术的老年患者术后谵妄的发生是否存在差别。方法选取2023年6月至2024年4月,在首都医科大学附属北京朝阳医院择期行脑血管内手术的老年患者,采用随机数字表法将患者分为瑞马唑仑麻醉组(R...目的比较瑞马唑仑与丙泊酚两种麻醉药对脑血管内手术的老年患者术后谵妄的发生是否存在差别。方法选取2023年6月至2024年4月,在首都医科大学附属北京朝阳医院择期行脑血管内手术的老年患者,采用随机数字表法将患者分为瑞马唑仑麻醉组(R组)和丙泊酚麻醉组(P组),共纳入106例患者,每组53例。主要研究指标为拔管后30 min至术后7d谵妄(postoperative delirium,POD)发生率。次要研究指标为麻醉时低血压、心动过缓发生率、血管活性药物使用率、拮抗药氟马西尼使用剂量、麻醉苏醒时间、延迟拔管发生率及术后48 h患者恢复质量[采用术后康复质量15条(Quality of Recovery-15,QoR-15)问卷评估]。结果共有103例患者(R组51例,P组52例)完成研究。R组和P组术后7d内POD发生率分别为5.88%和3.85%,两组比较差异均无统计学意义(P>0.05)。R组术中低血压和心动过缓发生率(19.60%,9.80%)较P组(53.85%,25.00%)显著降低,两组比较差异有统计学意义(P=0.0013,P=0.042)。R组术中去甲肾上腺素和麻黄素使用率明显低于P组,两组比较差异有统计学意义(P=0.020,P=0.033,)。两组患者麻醉苏醒时间、拔管时间和氟马西尼使用剂量的差异均无统计学意义(P>0.05)。两组术后48 h QoR-15评分比较差异无统计学意义(P>0.05)。结论对接受脑血管内手术的老年患者,与丙泊酚相比,瑞马唑仑不增加术后谵妄发生率,不增加麻醉苏醒和拔管时间,血流动力学更稳定,也不影响患者恢复质量。展开更多
This letter presents a new type of chaotic encryption system based on combined chaotic mapping pseudo-random number generator, Hash table, and elliptic curve. In this program, the elliptic curve algorithm is used for ...This letter presents a new type of chaotic encryption system based on combined chaotic mapping pseudo-random number generator, Hash table, and elliptic curve. In this program, the elliptic curve algorithm is used for the key distribution. After the linear transformation, the original chaotic sequence generated by drive system will be combined to chaotic mapping, converted to an encryption key sequence and constructed as Hash table for message authentication. The communication experiment used in the letter proves that the combination of combined chaotic encryption and conventional encryption is safe, feasible, and easy to implement by software.展开更多
基金Under the auspices of National Natural Science Foundation of China (No 40571162)Education Department of Anhui Province Foundation (No 2007sk097)Natural Science Foundation of Anhui (No 090415212),Program for Innovative Research Team in Anhui Normal University
文摘There are about 19 Neolithic Age sites and 120 Shang-Zhou dynasties sites in the western lakeshore of Chaohu Lake,Anhui Province,China.Based on sites data,topographic data,drainage maps,administrative maps and SPOT5 remote sensing data,spatial analysis methods were introduced into the archaeology of Chaohu Lake Basin with Geographic Information System(GIS).The spatial analysis methods include:1) Point Density Analysis with density model to acquire the shift of the sites;2) Distance Analysis to reveal the spatial structure of the sites;3) 3D Analysis based on Digital Elevation Model to get micro-geomorphologic features of the sites;and 4) Buffer Analysis to discover the relationship between the sites and rivers.The results indicate that the archaeological sites spread from the western lakeshore of Chaohu Lake gradually to the northwest,later to the south,and then symmetrically spread.Controlled by productive forces and other factors,ancient people preferred to reside in those places near water,or in plain and fertile land,which resulted in linear and decentralized distribution of the sites,and presented such disciplines as river valley directivity,terrace directivity and soil directivity.This paper indicates that the distribution of archaeological sites was influenced earlier by natural elements and later by human elements in the study period.The research is important for the integration of GIS and archaeology.
文摘目的比较瑞马唑仑与丙泊酚两种麻醉药对脑血管内手术的老年患者术后谵妄的发生是否存在差别。方法选取2023年6月至2024年4月,在首都医科大学附属北京朝阳医院择期行脑血管内手术的老年患者,采用随机数字表法将患者分为瑞马唑仑麻醉组(R组)和丙泊酚麻醉组(P组),共纳入106例患者,每组53例。主要研究指标为拔管后30 min至术后7d谵妄(postoperative delirium,POD)发生率。次要研究指标为麻醉时低血压、心动过缓发生率、血管活性药物使用率、拮抗药氟马西尼使用剂量、麻醉苏醒时间、延迟拔管发生率及术后48 h患者恢复质量[采用术后康复质量15条(Quality of Recovery-15,QoR-15)问卷评估]。结果共有103例患者(R组51例,P组52例)完成研究。R组和P组术后7d内POD发生率分别为5.88%和3.85%,两组比较差异均无统计学意义(P>0.05)。R组术中低血压和心动过缓发生率(19.60%,9.80%)较P组(53.85%,25.00%)显著降低,两组比较差异有统计学意义(P=0.0013,P=0.042)。R组术中去甲肾上腺素和麻黄素使用率明显低于P组,两组比较差异有统计学意义(P=0.020,P=0.033,)。两组患者麻醉苏醒时间、拔管时间和氟马西尼使用剂量的差异均无统计学意义(P>0.05)。两组术后48 h QoR-15评分比较差异无统计学意义(P>0.05)。结论对接受脑血管内手术的老年患者,与丙泊酚相比,瑞马唑仑不增加术后谵妄发生率,不增加麻醉苏醒和拔管时间,血流动力学更稳定,也不影响患者恢复质量。
文摘This letter presents a new type of chaotic encryption system based on combined chaotic mapping pseudo-random number generator, Hash table, and elliptic curve. In this program, the elliptic curve algorithm is used for the key distribution. After the linear transformation, the original chaotic sequence generated by drive system will be combined to chaotic mapping, converted to an encryption key sequence and constructed as Hash table for message authentication. The communication experiment used in the letter proves that the combination of combined chaotic encryption and conventional encryption is safe, feasible, and easy to implement by software.
