Dehydration in hydrous phases of the downgoing slab controls water release processes in sub- duction zones. Interplay between volatiles in hydrous minerals has complicated the previous knowledge of their dehydration. Phengite is an essential mineral carry
桶混助剂是农药使用时与制剂产品搭配使用、现混现用的一种助剂.玉米田除草剂使用中合理添加桶混助剂能明显提高防治效果.介绍农药桶混助剂的定义、功能,并介绍玉米田化学除草基本情况,在此基础上分析桶混助剂对苗后茎叶处理除草剂、土壤处理除草剂的减施增效作用,展望桶混助剂未来的发展方向及市场前景.
Slope toe excavation strongly influences the stress balance of natural slopes and redistributes the stress of the slope body. Consequently, the sliding failure of toe-cut slopes is increasingly becoming more frequent, particularly in regions with persiste
In this study, dynamic centrifuge model tests were performed for sand slopes under different earthquake ground motions and slope angle to characterize the seismic performance of slopes. Four groups of tests under varying seismic input amplitude were condu
The Litang fault is a left-lateral secondary shear zone in the Sichuan-Yunnan active block that accommodates the tectonic deformation associated with the eastward extrusion of the upper crust of the Tibetan Plateau. Based on 1 : 50000 geological mapping o
Climate fluctuations in the past and in the future are likely to result in population expansions,shifts,or the contraction of the ecological niche of many species,and potentially leading to the changes in their geographical distributions.Prediction of sui
There is increasing evidence indicating that melts derived from subducted oceanic crust and sediments may have played a key role in building continental crust. This mechanism predicts that juvenile arc crust should have oxygen isotope characteristics rang
The Lower Cambrian Niutitang and Sinian Doushantuo shales are the most important and widespread source rocks and target layers in South China. Reliable data of the thermal maturity of organic matter (OM) is widely used to assess hydrocarbon generation and
基于城市搬迁地开展园林绿化项目建设是解决城市高密区可用绿化空间不足的重要途径.构建基于城市搬迁地的园林绿化项目效益评估指标体系,以上海世博公园为例,在公园建成后第8年(2018年),从环境、社会、经济和景观4个方面对该场地尺度绿化项目产生的多重效益进行系统性综合评价.结果表明:世博公园在应对气候变化、降低土壤污染、增加生物多样性以及园林植物景观的色彩与季相方面的单项效益较为突出;在水文调控、净化空气、缓解热岛效应、休闲游憩和可达性方面的单项效益仍具一定提升空间.世博公园的综合效益指数为70.98,评估结果
通过问卷调查、走访种植大户及田间实地调查等方式,对新疆玉米主产区玉米有害生物发生与用药情况进行系统调查,明确新疆玉米有害生物发生种类、农药使用水平,分析存在问题并提出相应减药对策,从而为新疆玉米有害生物的科学防控及化学农药增效提供指导.结果表明,新疆玉米主要病害6种、害虫36种、杂草38种,主要以“6虫6草”为主.玉米有害生物防治常用农药共26类,其中杀虫剂14类,主要为拟除虫菊酯类、新烟碱类及生物源类;除草剂12类,主要为三氮苯类、磺酰脲类及酰胺.农药使用频次为2～6次/年,制剂施用量为1.938～6.