Results 51 to 60 of about 1,003 (145)

Preparation and response surface optimization of lightweight porous structures [PDF]

open access: yes
As a new type of building material structure, the porous structure still faces problems such as inaccurate optimal ratio and poor compatibility with plants, which affect its application.
Kai HE   +7 more
core   +1 more source

Influence of pore-fracture structure characteristics of coal rock on its damage evolution law [PDF]

open access: yes
The development and expansion of fractures in coal rocks are the primary causes of mining disasters, such as gas outbursts, rock bursts, and instability of coal pillars.
Aibing JIN   +5 more
core   +1 more source

青藏高原冻融侵蚀动力特征研究

open access: yesShuitu Baochi Xuebao, 2000
青藏高原的地理、地质和气候都具有特殖性,因而其土壤侵蚀是以冻融侵蚀为主结合其它多种侵蚀类型的侵蚀作用,具体分析了青藏高原冻融侵蚀的动力和3种特殊形态的冻融侵蚀。为了减少水土流失,保护高原生态环境,最后提出了几点意见。
董瑞琨 许兆义 等
doaj  

Dynamic evaluation of landslide susceptibility in Heifangtai, Gansu based on time-series InSAR and multi-temporal cataloguing [PDF]

open access: yes
Landslide disasters occur frequently in the mountainous regions of western China, and accurate classification of landslide hazard risk levels is crucial for effective geohazard mitigation.
Jiebo QU   +5 more
core   +1 more source

Progress in developments and applications of the HYDRUS model and associated coupling model packages [PDF]

open access: yes
HYDRUS model is widely used in agricultural irrigation and pollution transport because it can comprehensively consider the movement of water, heat, and pollutants in the soil-plant-atmosphere system.
Bei ZHANG   +5 more
core   +1 more source

降雨、积雪以及土地利用复合影响下的额尔齐斯河流域土壤侵蚀分析

open access: yesShuitu Baochi Xuebao, 2022
在我国西北高寒山区,冰冻圈环境导致土壤侵蚀过程更为复杂。因此,以新疆阿尔泰山额尔齐斯河流域为例,构建模型模拟典型流域降雨、融雪和土地利用变化(LUCC)综合影响下的土壤侵蚀过程,并揭示复合因素影响下土壤侵蚀的放大作用。为此采用InVEST模型分别对2000年、2005年、2010年和2015年土壤侵蚀空间分布进行了详细模拟,并建立了3种情景用于复合影响的分析,分别为降雨和土地利用变化、降雨和融雪变化以及降雨、融雪和土地利用变化对土壤侵蚀的复合影响。结果表明:(1)相较于2000年,2005 ...
张晓敏, 张东梅, 王莉, 张伟
doaj  

水氮调控对休耕期土壤养分迁移及翌年土壤肥力的影响

open access: yesShuitu Baochi Xuebao, 2019
为研究河套灌区盐碱农田不同施氮量在冻融作用后对翌年春播前土壤肥力的影响效应,结合翌年土壤肥力状况确定当地适宜的施氮量。采用田间试验的方法,共设置4个施氮水平(高氮N3:325 kg/hm2;中氮N2:225 kg/hm2;低氮N1:125 kg/hm2;不施氮N0)研究冻融期内水盐时空分布、全氮、碱解氮以及有机质含量的变化规律,并采用主成分分析法对翌年春播前土壤肥力进行综合评价。结果表明:(1)秋浇后,土壤含水率显著高于秋浇前,表层土壤含水率增加,开始冻结时,水分向表层积聚 ...
王美荣   +5 more
doaj  

Spatial structure characteristics and formation mechanism of the ancient Deda landslide elucidated using the microtremor survey method in Sichuan Province, China [PDF]

open access: yes
Objective  The topography and geological structure of the eastern Qinghai-Tibet Plateau are highly complex. High development density and intricate spatial structures of large ancient landslides in alpine canyon areas, such as those in the Jinsha River ...
CHEN Wenkai   +7 more
core   +1 more source

覆沙坡面径流冲刷试验研究

open access: yesShuitu Baochi Xuebao, 2018
通过室内模拟冷冻和放水冲刷试验,采用2个放水流量(1,2 L/min)、2个土壤处理(未冻坡面,冻结坡面)和4个覆沙厚度(0,1,2,3 cm)研究不同处理对覆沙黄土坡面产流产沙的影响。结果表明:(1)相同流量条件下,覆沙坡面初始产流时间延长,随着覆沙厚度的增加,延长效果越明显,而冻融作用使坡面初始产流时间缩短;不同处理坡面的产流产沙峰值均增大,并且产流量与产沙量的峰现时间具有不同步性。(2)不同流量条件下,不同处理坡面总产流量是对照坡面的1.02~1.28倍,冻结坡面和冻结 ...
任宗萍   +6 more
doaj  

Molecular Ecology Research Progress for Soil Denitrification and Research Status for Its Influencing Factors [PDF]

open access: yes, 2013
反硝化作用是在微生物参与下的土壤氮循环中的一个重要过程,反硝化作用强弱直接影响着氮素的利用。反硝化微生物是一大生理类群,广泛分布于细菌、真菌和古菌中,经典的16S rrnA方法不适合反硝化细菌的生态学研究。利用功能基因,结合现代分子生物学技术,已成为反硝化研究的常用方法。主要介绍了变性梯度凝胶电泳、末端标记限制性片段长度多态性技术、实时荧光定量PCr、反转录PCr以及最近发展起来的高通量测序技术和功能单细胞分离技术在反硝化生态研究中的应用,并综述了土壤反硝化作用的研究进展及其影响因素 ...
杨小茹, 王海涛, 郑天凌
core  

Home - About - Disclaimer - Privacy