Results 91 to 100 of about 516 (164)
Analysis of open-pit coal mine collapse accident based on AcciMap model [PDF]
Take Alxa open-pit coal mine collapse accident on February 22 in Inner Mongolia as an example, on the basis of identifying the cause factors of the accident, the logical relationship between the cause factors of the accident is sorted out, and the ...
Yamin GUO, Yang LI, Zhaobo CHEN
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Shuitu Baochi Xuebao, 2005 丘陵、中低山区(海拔<1 500 m)是经济林果木发展的主要适生区域,亦是人类活动最频繁的区域,生态系统脆弱,一旦土壤地被物遭破坏,极易引起严重的水土流失.通过在四川盆地紫色土桃园地和盆边山地黄壤茶园地设置16个径流场,进行4种除草处理,应用不同除草方式调控水土流失试验1年,结果表明(1)除草试验处理的土壤侵蚀量和养分(N,P,K,OM)流失量排序是耕作除草＞草甘膦除草＞克无踪除草＞割草覆盖(CK).(2)除草试验处理的土壤侵蚀量与传统耕作除草相比较,坡度25°和坡度10°的桃园地应用草甘膦除草 ...
闵安民 郭亨孝 李红霞 赵蓉
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[Research progress on interference in the identification of accelerants in a fire scene]. [PDF]
Se Pu, 2022 Yin G +5 more
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野生动物学报, 2014 2013年8月,在北京动物园马来貘馆,采用瞬时扫描取样法、焦点动物取样法和全事件取样法,对5只马来貘的行为和室外运动场空间的选择利用进行了研究。结果表明,马来貘在室外运动场主要使用草地、土地、深水水池和水泥地,较少使用浅水地面,回避乱石地; 运动型刻板行为多发生在门口或角落处的水泥地面上。为躲避游人干扰和日光暴晒,马来貘对室内的利用强度显著高于室外(P=0.011)。马来貘在室外运动场将较多的时间用于卧息、游泳和走动,其次是站立、刻板行为和采食,仅将很少的时间用于其他行为(包括饮水、排便、嗅闻、惊跳 ...
崔多英 Chia L.Tan 张金国 刘 宁 车晓龙
doaj
Effects of Interplanting Medicinal Herbs on Runoff, Sediment and Nitrogen and Phosphorus Losses in Young Oil Tea Plantation on Red Soil Sloping Field [PDF]
[Objective] To investigate the effects and applicability of different intercropping patterns of medicinal herbs on water, soil, and nutrient losses in young oil tea gardens on red soil slopes. [Methods] Runoff plot experiments were carried out in Jiangxi
DUAN Jian +4 more
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Current Application Status of Photoelectric Pre-discarded Technology in Waste Rock Recovery Process [PDF]
Our country boasts abundant mineral resources, but they are of a low grade, with a fine distribution and complex composition. With the increase of the consumption of mineral resources, the amount of waste rock generated is also increasing.
Qiang SONG +3 more
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Shuitu Baochi Xuebao[目的] 冻融过程土壤呼吸在年土壤呼吸总量中占有重要比例,研究探讨土壤冻融过程中含水量、冻结温度和冻融循环次数对土壤碳矿化动态的影响。[方法] 以黑龙江省嫩江县鹤山农场九三水土实验站黑土为研究对象,开展室内冻融程度模拟试验,进行7次冻融循环,设置100%田间持水量(100%WHC)、60%田间持水量(60%WHC)和30%田间持水量(30%WHC)3种土壤含水量;10 ℃恒温处理(对照)、-5 ℃冻结处理(轻度冻结)和-15 ℃冻结处理(重度冻结)3种环境温度。[结果] 冻融循环次数 ...
张博 +6 more
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[Risk factors for neonatal asphyxia and establishment of a nomogram model for predicting neonatal asphyxia in Hubei Enshi Tujia and Miao Autonomous Prefecture: a multicenter study]. [PDF]
Zhongguo Dang Dai Er Ke Za Zhi, 2023 Jin F +26 more
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[Visual analysis of the current research status and hotspots of electric burns at home and abroad]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi, 2023 Chen HX +7 more
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Zhendong Ceshi yu Zhenduan为研究跑道主要功能指标对飞机和跑道的影响，首先，通过三维激光扫描技术构建三维道面高程模型，较为准确地反映道面平整度和纵横坡坡度信息，当跑道全长范围内的国际平整度指数（international roughness index， 简称IRI）等于0.855 m/km和分段IRI均小于规范规定值1 m/km时，该机场跑道平整度处于“优”；其次，结合道面高程数据计算得到的着陆过程3个阶段平整度影响系数最大值（1，1.185，1.145）可知，平整度对飞机着陆过程影响大小排序依次为减速阶段、滑行阶段、接地阶段 ...
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