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排序方式: 共有1870条查询结果,搜索用时 78 毫秒
291.
基于“三生”适宜性的县域土地利用冲突识别与分析 总被引:1,自引:0,他引:1
精准识别潜在土地利用冲突有利于预警权衡和协调冲突用地,有利于科学进行国土空间规划。以“三调”修正数据为基础,基于生产、生活、生态视角,构建高植被覆盖率县域生产、生活、生态即“三生”适宜性评价模型与土地利用冲突识别矩阵,并选取横峰县进行实证分析。结果表明:(1)横峰县“三生”适宜性用地的空间分布与面积构成差异显著,且存在明显的空间叠加特征,暗示着研究区土地利用存在冲突;(2)从潜在冲突识别的结果来看,土地利用适宜区、冲突激烈区、冲突中度区、冲突一般区及冲突微弱区面积占比分别为64.02%、9.66%、17.19%、1.66%、7.48%;(3)各个冲突类型区空间分布、表现形式的差异性决定了冲突和解的对策也需因地制宜。研究结果可为相关及类似县域的国土空间规划提供理论参考。 相似文献
292.
Over the recent past, fluoroquinolone antibiotics (FQs) have raised extensive attention due to their potential to induce the formation of resistance genes and “superbugs”, thus various advanced oxidation techniques have been developed to eliminate their release into the environment. In the present study, the prototype tetraamido macrocyclic ligand (FeIII-TAML)/hydrogen peroxide (H2O2) system is employed to degrade FQs (i.e., norfloxacin and ciprofloxacin) over a wide pH range (i.e., pH 6-10), and the reaction rate increases with the increase in pH level. The effect of dosage of FeIII-TAML and H2O2 on the degradation of FQs is evaluated, and the reaction rate is linearly correlated with the added amount of chemicals. Moreover, the impact of natural organic matters (NOM) on the removal of FQs is investigated, and the degradation kinetics show that both NOM type and experimental concentration exhibit negligible influence on the oxidative degradation of selected antibiotics. Based on the results of liquid chromatography-high resolution mass spectrometry and theoretical calculations, the reaction sites and pathways of FQs by FeIII-TAML/H2O2 system are further predicted and elucidated. 相似文献
293.
He Yao Tian Huafeng Xiang Aimin Ma Songbai Yin Duoyan Varada Rajulu A. 《Journal of Polymers and the Environment》2022,30(7):2964-2975
Journal of Polymers and the Environment - In recent years, the treatment of water pollution has been a challenging and far-reaching topic. In order to improve the adsorption performance of... 相似文献
294.
Han Xiaolong Jin Yujuan Wang Bohua Tian Huafeng Weng Yunxuan 《Journal of Polymers and the Environment》2022,30(2):461-471
Journal of Polymers and the Environment - Polypropylene carbonate (PPC)/polybutylene succinate (PBS) blends were prepared by melt-blending with terminal epoxy-based hyperbranched polymers (EHBP) as... 相似文献
295.
Chen Xing Daihui Yang Yan Zhang Tian Sun Junfei Duan Hussein A.Younus Shiguo Zhang 《绿色能源与环境(英文)》2022,7(1):43-52
Heteroatom-doped meso/micro-porous carbon materials are conventionally produced by harsh carbonization under an inert atmosphere involving specific precursors, hard/soft templates, and heteroatom-containing agents. Herein, we report a facile synthesis of N and O co-doped meso/micro-porous carbon (NOMC) by template-free carbonization of a small-molecule precursor in a semi-closed system. The semi-closed carbonizaiton process yields hydrophilic NOMCs with large surface area in a high yield. The porous structure as well as the elemental composition of NOMCs can be modulated by changing the holding time at a particular temperature. NOMCs as metal-free heterogeneous catalysts can selectively oxidize benzyl alcohol and its derivatives into aldehydes/ketones with>85%conversion in aqueous solution, which is much higher than that of the control sample obtained in tube furnace (21%conversion), mainly due to their high N content, high percentage of pyridinic N, and large surface area. The presence of O-containing moieties also helps to improve the hydrophilicity and dispersion ability of catalysts and thus facilitates the mass transfer process during aqueous oxidation. The NOMC catalysts also dispayed excellent activity for a wide range of substrates with a selectivity of>99%. 相似文献
296.
Wang Junhong Shao Bin Liu Xianzhao Ji Xiaohui Tian Guanghui Ge Hongguang 《Environmental science and pollution research international》2022,29(32):48348-48357
Environmental Science and Pollution Research - CdS-AgO@g-C3N4 nanocomposites were successfully synthesized and characterized by XRD, N2 physical adsorption, XPS, SEM, TEM, EDX, and UV–Vis DRS... 相似文献
297.
Tian Li Sun Mengqi Lin Lisen Wang Yan Yu Yang Duan Junchao Sun Zhiwei 《Environmental science and pollution research international》2022,29(36):53954-53966
Environmental Science and Pollution Research - Air pollution is one of the biggest environmental health problems in the world; accumulative studies have shown that air pollution was closely related... 相似文献
298.
通过对建筑施工企业管理人员及施工场地周围居民的环境保护态度进行调查研究,结果表明:在污染治理方面,建筑垃圾主要以当场焚烧和运往指定地点填埋为主。施工噪声主要是禁止夜间施工和修建噪声防护墙为主。引起目前建筑施工污染环境的主要原因为环境监察力度不够,环保投入少,管理不科学等三个方面。从健全法律法规,增大环保宣传力度,加强对施工单位的管理,改进施工工艺等提出相应的解决方法,以解决目前建筑施工企业在环境保护方面存在的问题,减少污染,增强人们的环境保护意识。 相似文献
299.
对近年来关于炼油碱渣的各种处理方法及其应用作了介绍,从投资费用、运行费用、运行管理和安全风险等诸方面进行了对比,并指出生物处理方法是今后炼油碱渣处理的一种趋势. 相似文献
300.