Results 121 to 130 of about 4,158 (239)
Zhejiang Daxue xuebao. Lixue ban, 2013 以硝酸铈铵I2/CAN为反应体系时，当苯环上有给电子基团，碘和硝酸根对烯丙基双键的加成及苯环单碘代产物，收率较好；当苯环连有吸电子基团时，碘和硝酸根对烯丙基双键加成，产率较低.以Br2/CAN为反应体系时，当苯环上连有给电子基团时，溴对烯丙基碳碳双键加成，苯环上发生了一溴代或二溴代，产率中等；当苯环上连有吸电子基团时，溴对烯丙基碳碳双键加成，产率较高.
HEZhi-cheng(何志成) +1 more
doaj +1 more source
Construction and application of green and low-carbon evaluation indicators for coal mining areas [PDF]
Coal mining areas serve as pivotal bases for coal production, holding significant importance for local economies and energy supply. In the development of China’s energy and environmental protection, the planning of mining areas plays a crucial role. With
Lei YU +8 more
core +1 more source
A Research on Asset-Light Strategy Transition Of Landsea Group [PDF]
, 2015 中国经济结束了30年的高速增长，转向平稳期，受此影响，中国的房地产行业亦结束了“跑马圈地”的黄金十年。2014年，随着市场供需结构矛盾的日益突显，成交面积出现拐点，市场转折下行，房地产行业进入高位盘整期。处在这样的市场环境之下，可以预见未来的几年内，将出现大量的行业洗牌、兼并的案例，房地产企业将不再单纯地比规模、比增长速度，而应该制定更为安全有效的企业发展战略与市场竞争策略。 以朗诗集团为代表的节能住宅开发企业始终坚持做绿色地产，本着差异化的产品竞争优势与技术服务优势，在这样市场下行的大环境之下 ...
龚茜
core
Simulation of medium- and long-term crude oil demand scenarios in China based on system dynamics [PDF]
Objective With the implementation of the "dual carbon" strategy and the rapid development of the new energy system, there is consensus in the industry that China's crude oil consumption is approaching a plateau and will gradually decline. In this context,
Chao WU +6 more
core +1 more source
野生动物学报, 2023 为了对比分析冬季和春季狍（Capreolus pygargus）取食营养策略及其影响因素，2020年11月—2021年5月，在吉林珲春东北虎国家级自然保护区进行野外调查和样本采集等工作，共收集狍粪便38份，其中冬季26份，春季12份；植物样本953份，其中冬季542份，春季411份。通过分析狍食性，测定可食植物宏营养和微营养含量，以及定量环境中食物获得性和可食植物的营养含量，对比分析冬春季狍的食物组成和营养策略。结果表明：冬春季狍食物组成和食物可获得性存在差异 ...
齐琦, 包衡, 姜广顺
doaj
Recent progress of membrane-based CO_2 capture from biogas and flue gas [PDF]
Carbon capture technologies, including absorption, adsorption, and membrane separation, have emerged as one of the research hotspots, in the process of achieving carbon peaking and carbon neutrality goals.
DAI Zhongde* +8 more
core +1 more source