本文以南美洲秘鲁某港口用混凝土联锁块耐磨性参数检测实例,将同一块混凝土联锁块加工为两个样品,分别采用中国标准《GB 12988-2009无机地面材料耐磨性能试验方法》及英国标准《BS EN 1338:2003 Concrete paving blocks:Requirements an...本文以南美洲秘鲁某港口用混凝土联锁块耐磨性参数检测实例,将同一块混凝土联锁块加工为两个样品,分别采用中国标准《GB 12988-2009无机地面材料耐磨性能试验方法》及英国标准《BS EN 1338:2003 Concrete paving blocks:Requirements and test methods》进行耐磨性试验,共90组样品。采用SPSS分析数据,结果表明:两种方法得出的试验结果具有极强相关性,回归方程为Y=1.73+0.46*X,相关系数为0.822。展开更多
The environmental changes in show caves have been concerned by the show cave managers and speleo-scientists. Most scientists have recognized the speleo-activities and tourist facilities as the main factors to force th...The environmental changes in show caves have been concerned by the show cave managers and speleo-scientists. Most scientists have recognized the speleo-activities and tourist facilities as the main factors to force the environment changes in the show caves. The show caves in carbonate rocks including the water caves and dried caves are strongly influenced by the visitor flow. Great number of visitors rushing into the show caves in a short periods causes the CO2 content and temperature rapidly increase, especially in the narrow and small passages and chambers. The maximum CO2 content was 7000 ppm （May 2, 2001） in the chamber about 20 m long, 25 m wide and 58 m high in Baiyun Cave, Hebei, after about 3000 people visited for 5 hours, the temperature increased from 16 8 ℃ to 19.6℃.In some cases, the natural factors may make great changes of the cave environment . For example, the heavy rain caused the great amount of drops in Yaolin Cave,Zhejiang.CO2 concentration was obviously increased from 490800 ppm on October 30 （before raining） to 7401580 ppm on November 14, 1997 （ after raining）. The measurement results show the temperature of drop water is 0.10.6℃ higher than the cave temperature, but it is not very clear that the temperature of cave was whether increased or not in the big chambers in Yaolin Cave. In Huangxian Cave, Hubei, in the wet season, most of 1833 rim pools were over flowing, the average CO2 content in the Rim Pool Hall on October 6,2000 was 2050 ppm, in the range of 1800 ppm and 2300 ppm; the temperature varied from 17.6℃ to 19.1℃, average temperature was 18.5℃. While on August 20, 2001, when 90% of the rim pools were dried out,it was only 950 ppm of average CO2 concentration varying from 900 ppm to 1100 ppm, and the average temperature was 17.9℃, fluctuated from 15.9℃ to 21.3℃.展开更多
近年来随着国家对建筑行业的大力发展以及一带一路的政策引导下,铁路、公路、市政、水运等项目的建设发展都得到了质的飞跃。对于测绘行业来说,在保证设计及规范的精度同时,航拍摄影技术能提高测绘的工作效率,使得施工进度大大提高。针...近年来随着国家对建筑行业的大力发展以及一带一路的政策引导下,铁路、公路、市政、水运等项目的建设发展都得到了质的飞跃。对于测绘行业来说,在保证设计及规范的精度同时,航拍摄影技术能提高测绘的工作效率,使得施工进度大大提高。针对使用无人机的倾斜航拍摄影技术与基于Context Capture Center Engine软件为平台互相结合,使得在实际现场的测绘、地形图长度计算、面积计算及体积计算中都能直接在PC端快速直观地呈现出来,减少外业测绘带来的工作强度大、效率低、成本高等主要问题,为实际现场施工过程中提供高效准确的数据信息。展开更多
2022年冬奥会主题曲《雪花》的小提琴表演者马奕菲,在两岁的时候由于一场疾病变成了盲人,但她自强不息,身残志坚,经过艰苦的训练和不断的坚持,最终取得了成功。(2022·云南昆明中考)For 16-year-old Ma Yifei, the violin performan...2022年冬奥会主题曲《雪花》的小提琴表演者马奕菲,在两岁的时候由于一场疾病变成了盲人,但她自强不息,身残志坚,经过艰苦的训练和不断的坚持,最终取得了成功。(2022·云南昆明中考)For 16-year-old Ma Yifei, the violin performance of the Beijing 2022 Olympic theme song, Snowflake, was her best present for Paralympians(残奥运动员)all over the world.展开更多
文摘本文以南美洲秘鲁某港口用混凝土联锁块耐磨性参数检测实例,将同一块混凝土联锁块加工为两个样品,分别采用中国标准《GB 12988-2009无机地面材料耐磨性能试验方法》及英国标准《BS EN 1338:2003 Concrete paving blocks:Requirements and test methods》进行耐磨性试验,共90组样品。采用SPSS分析数据,结果表明:两种方法得出的试验结果具有极强相关性,回归方程为Y=1.73+0.46*X,相关系数为0.822。
文摘The environmental changes in show caves have been concerned by the show cave managers and speleo-scientists. Most scientists have recognized the speleo-activities and tourist facilities as the main factors to force the environment changes in the show caves. The show caves in carbonate rocks including the water caves and dried caves are strongly influenced by the visitor flow. Great number of visitors rushing into the show caves in a short periods causes the CO2 content and temperature rapidly increase, especially in the narrow and small passages and chambers. The maximum CO2 content was 7000 ppm （May 2, 2001） in the chamber about 20 m long, 25 m wide and 58 m high in Baiyun Cave, Hebei, after about 3000 people visited for 5 hours, the temperature increased from 16 8 ℃ to 19.6℃.In some cases, the natural factors may make great changes of the cave environment . For example, the heavy rain caused the great amount of drops in Yaolin Cave,Zhejiang.CO2 concentration was obviously increased from 490800 ppm on October 30 （before raining） to 7401580 ppm on November 14, 1997 （ after raining）. The measurement results show the temperature of drop water is 0.10.6℃ higher than the cave temperature, but it is not very clear that the temperature of cave was whether increased or not in the big chambers in Yaolin Cave. In Huangxian Cave, Hubei, in the wet season, most of 1833 rim pools were over flowing, the average CO2 content in the Rim Pool Hall on October 6,2000 was 2050 ppm, in the range of 1800 ppm and 2300 ppm; the temperature varied from 17.6℃ to 19.1℃, average temperature was 18.5℃. While on August 20, 2001, when 90% of the rim pools were dried out,it was only 950 ppm of average CO2 concentration varying from 900 ppm to 1100 ppm, and the average temperature was 17.9℃, fluctuated from 15.9℃ to 21.3℃.
文摘近年来随着国家对建筑行业的大力发展以及一带一路的政策引导下,铁路、公路、市政、水运等项目的建设发展都得到了质的飞跃。对于测绘行业来说,在保证设计及规范的精度同时,航拍摄影技术能提高测绘的工作效率,使得施工进度大大提高。针对使用无人机的倾斜航拍摄影技术与基于Context Capture Center Engine软件为平台互相结合,使得在实际现场的测绘、地形图长度计算、面积计算及体积计算中都能直接在PC端快速直观地呈现出来,减少外业测绘带来的工作强度大、效率低、成本高等主要问题,为实际现场施工过程中提供高效准确的数据信息。
文摘2022年冬奥会主题曲《雪花》的小提琴表演者马奕菲,在两岁的时候由于一场疾病变成了盲人,但她自强不息,身残志坚,经过艰苦的训练和不断的坚持,最终取得了成功。(2022·云南昆明中考)For 16-year-old Ma Yifei, the violin performance of the Beijing 2022 Olympic theme song, Snowflake, was her best present for Paralympians(残奥运动员)all over the world.
