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Ultra-early strong polyether monomers were purchased from Levima Advanced Materials Corporation (Shandong, China), with average molecular of 2400 Da. 2-acrylamine-2- methylpropyl sulfonic acid (AMPS) and acrylic acid (AA) were received from RBL Co., Ltd.
Microsilicon, sulfonaldehyde ketone condensation DRS-1S, retarder DRH-2L, fluid loss agent DRF-2L, defoaming agent DRX-1L, high temperature reinforced materials DRB-2S, high temperature strength retrogression inhibitor DRB-3S, high temperature suspending agent DRY-S2, and other admixtures, were obtained from CNPC Engineering and Technology R&D Company Limited (Beijing, China).
Acknowledgement The authors gratefully acknowledge the financial support from National Science and Technology Major Project of China (Grant No. 2016ZX05020-004) and Engineering and Technology Major Special Project of PetroChina (Grant No. 2018E-21).
Shen, Suggestions on CNPC cementing technological development, Oil Forum, 36(2017) 26-31
Yu, Zwitterionic copolymer for controlling fluid loss in oilwell cementing: Preparation, characterization, and working mechanism, Polymer Engineering Science, 57(2016) 78-88

Research Framework & Key Issues for Non-Point Source Pollution in Agriculture Induced by Water-Loss and Soil-Erosion Cailian Hao1,2,a, Denghua Yan2,b, Weihua Xiao2,c and Jun Yin2,d 1 Environmental Science and Engineering Department, Donghua University, Shanghai, P R China, 201620 2 Water Resources Department, China Institute of Water Resources and Hydropower Research, Beijing, P R China, 100038 ahaocailian123@163.com, byandh@iwhr.com, cxiaoweihua@iwhr.com, dyinjunhuangshang@126.com Keywords: water-loss and soil-erosion, non-point source pollution in agriculture, water-loss and soil-erosion dominated non-point source pollution in agriculture, technical framework, and key issues.
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Characteristic Analysis on Mountain-valley Wind in Deep valley Wenyong Wang 1, a, Nan Chen 2, b and Xiaojuan Ma 3, c 1Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University Chengdu, Sichuan, china, Post Code: 610031 2Sichuan Province Environmental Sciences Academy Chengdu, Sichuan, china, Post Code: 610031 3Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University Chengdu, Sichuan, china, Post Code: 610031 awywangly@163.com, bchennan1204@126.com, cxjma1038@163.com Keywords: mesoscale meteorological numerical model; mesoscale dispersion model; mountain-valley wind Abstract.
The part of the dynamical core in WRF (Weather Research & Forecasting) takes two independent sets of dynamic framework: one is ARW (Advanced Research WRF) for scientific research; another is NMM (Non-hydrostatic Mesoscale Model) for weather forecasting.
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Teachers must be familiar with the platform management, curriculum construction, forum management, online communication tools and other teaching information technologies involved in online teaching and mixed teaching, and have strong information technology capabilities.
New Practice Teaching of "Online plus Offline" On the teaching of online courses, relying on the SPOC (Small Private Online Course) platform in the school, we choose courses with characteristics and strong nationality (such as the Law on Regional Ethnic Autonomy) to carry out online course construction in advance.
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