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Study on Sweet Potato Stem Nematode Disease
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作者 Xiaoding GUO Yizhi XIE +2 位作者 Zhaodong JIA peiyong ma Xiaofeng BIAN 《Plant Diseases and Pests》 CAS 2012年第2期21-23,共3页
The pathogen and characteristics, infection cycle, occurrence regularity and damage symptoms of sweet potato stem nematode disease were introduced in the paper. Moreover, the comprehensive prevention measures were put... The pathogen and characteristics, infection cycle, occurrence regularity and damage symptoms of sweet potato stem nematode disease were introduced in the paper. Moreover, the comprehensive prevention measures were put forward, including plant quarantine, agricultural control and chemical control. The study provided certain basis for reducing damages of sweet potato stem nematode disease and improving yield and quality of sweet potato. 展开更多
关键词 Sweet potato stem nematode disease Infection cycle Occurrence regularity Damage symptoms Prevention and control China
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响应面法优化制备塑料-锯末活性炭 被引量:2
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作者 马培勇 王田 +2 位作者 武晋州 邢献军 张贤文 《过程工程学报》 CAS CSCD 北大核心 2019年第2期377-386,共10页
将梧桐锯末和聚丙烯塑料按比例混合后,采用K_2CO_3活化法制备活性炭,基于中心组合实验设计(CCD)的响应面法(RSM),以碘吸附值和亚甲基蓝吸附值为优化目标,优化工艺参数。结果表明,当塑料含量为19wt%、无水K_2CO_3与梧桐锯末质量比为1.73... 将梧桐锯末和聚丙烯塑料按比例混合后,采用K_2CO_3活化法制备活性炭,基于中心组合实验设计(CCD)的响应面法(RSM),以碘吸附值和亚甲基蓝吸附值为优化目标,优化工艺参数。结果表明,当塑料含量为19wt%、无水K_2CO_3与梧桐锯末质量比为1.73、活化温度为958℃、活化时间为91min时,所制活性炭的性能最优,碘吸附容量为1 320.97mg/g,亚甲基蓝的吸附容量为471.95 mg/g,与二阶模型预测值接近,表明该模型具有较高的可信度。方差分析结果表明,盐料比、活化温度、活化时间提高对活性炭的碘吸附容量有显著的促进作用,而塑料含量对活性炭碘吸附容量有抑制作用;活化温度、活化时间对活性炭的亚甲基蓝吸附容量影响显著,与塑料含量均具有促进作用,而盐料比是非显著因素且有抑制作用。最优条件下所制活性炭的比表面积为1916.10 m^2/g,总孔容为1.12 cm^3/g,其中介孔高达70.10%。相比于单因素优化实验所制活性炭,比表面积提高了454.11m^2/g。FT-IR分析表明两种优化条件下所制活性炭的官能团基本没有变化,活性炭亚甲基蓝吸附量的提高主要是由于样品的比表面积增大。 展开更多
关键词 塑料 活性炭 亚甲基蓝 响应面法 中心组合实验设计
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污泥-锯末混合ZnCl2活化制备活性炭 被引量:7
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作者 吴东强 马培勇 +2 位作者 胡淞 邢献军 张贤文 《过程工程学报》 CAS CSCD 北大核心 2018年第4期792-798,共7页
以城市污水厂二沉池污泥为主要原料、固体Zn Cl2为活化剂,添加一定量锯末,在高温管式炉中采用化学活化法制备污泥活性炭,通过单因素实验考察了锯末添加率、盐料比、活化温度、活化时间对污泥活性炭吸附性能的影响.结果表明,锯末添加量为... 以城市污水厂二沉池污泥为主要原料、固体Zn Cl2为活化剂,添加一定量锯末,在高温管式炉中采用化学活化法制备污泥活性炭,通过单因素实验考察了锯末添加率、盐料比、活化温度、活化时间对污泥活性炭吸附性能的影响.结果表明,锯末添加量为20%、盐料质量比为2.0、活化温度为550℃、活化时间为15 min时,所得活性炭碘吸附性能最优,达679.25 mg/g;污泥活性炭具有发达的孔结构,其比表面积达609.68 m2/g,总孔容为0.51 cm3/g,平均孔径为3.51 nm. 展开更多
关键词 污泥 活性炭 氯化锌 干混 制备 吸附 孔结构
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基于分子动力学模拟的羟基改性调控活性炭对甲苯吸附性能的作用机理研究 被引量:5
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作者 肖邦 曹青 +2 位作者 马培勇 毕海林 李鹏程 《过程工程学报》 CAS CSCD 北大核心 2022年第5期660-670,共11页
本工作通过在六苯并苯分子边缘植入羟基构建不同羟基含量的改性活性炭,采用分子动力学和巨正则蒙特卡罗模拟研究了改性活性炭模型的物理性质、局部电荷和孔径分布,进一步分析了甲苯分子在改性活性炭中的动力学特性和吸附机理。结果表明... 本工作通过在六苯并苯分子边缘植入羟基构建不同羟基含量的改性活性炭,采用分子动力学和巨正则蒙特卡罗模拟研究了改性活性炭模型的物理性质、局部电荷和孔径分布,进一步分析了甲苯分子在改性活性炭中的动力学特性和吸附机理。结果表明,引入羟基可加强活性炭对甲苯的吸附能力。在较高相对压强下,羟基含量为39.4%是活性炭改性的最佳浓度,超过此浓度后甲苯的吸附量下降。改性活性炭羟基中强电负性的氧原子与甲苯甲基中的氢原子配合成Lewis酸碱对,形成稳定的吸附结构,进而增强活性炭对甲苯的吸附能力。在较低相对压强下,影响吸附量的主要因素为孔隙率和孔径大小;羟基含量为20.8%和31.4%的改性活性炭内多为微孔且结构较为紧密,使得其吸附甲苯效果较好。羟基改性使得甲苯分子在活性炭内的自扩散系数降低,且在含39.4%羟基的活性炭中扩散系数最低,这是由于甲苯分子与改性活性炭之间的非键相互作用阻碍了甲苯分子的运动。此外通过变温吸附研究发现,由于活性炭吸附甲苯过程具有放热性质,温度升高不利于甲苯的吸附。 展开更多
关键词 活性炭 羟基改性 吸附 分子动力学 扩散
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基于SLMD预测生物质三组分混合成型特性
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作者 孙海韵 马培勇 +2 位作者 邢勇强 邢献军 陈明明 《过程工程学报》 CAS CSCD 北大核心 2019年第3期575-580,共6页
采用单纯形格子混料设计法(SLMD)建立了生物质三组分致密成型性能指标预测模型,并进行了实验验证。结果表明,比能耗和松弛密度回归方程的相关系数均大于0.9998,与实验数据的最大相对误差分别为3.82%和0.5166%。生物质成型过程中三组分... 采用单纯形格子混料设计法(SLMD)建立了生物质三组分致密成型性能指标预测模型,并进行了实验验证。结果表明,比能耗和松弛密度回归方程的相关系数均大于0.9998,与实验数据的最大相对误差分别为3.82%和0.5166%。生物质成型过程中三组分对其有一定的交互作用,纤维素比例越高,比能耗越大,松弛密度越小;木质素比例越高,比能耗越小,但比例过高,比能耗有略微上升趋势;半纤维素比例越高,松弛密度越大。用棉花秸秆、毛竹和玉米秸秆进行实验验证,比能耗和松弛密度回归模型的最大相对误差分别为2.64%和1.0342%,表明模型对实际生物质有一定的预测效果。 展开更多
关键词 单纯形格子混合设计法 生物质 生物质致密成型 比能耗 松弛密度 回归模型
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Overexpression of IbPAL1 promotes chlorogenic acid biosynthesis in sweetpotato 被引量:9
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作者 Yang Yu Yingjie Wang +5 位作者 Yue Yu peiyong ma Zhaodong Jia Xiaoding Guo Yizhi Xie Xiaofeng Bian 《The Crop Journal》 SCIE CSCD 2021年第1期204-215,共12页
Sweetpotato[Ipomoea batatas(L.)Lam.],a food crop with both nutritional and medicinal uses,plays essential roles in food security and health-promoting.Chlorogenic acid(CGA),a polyphenol displaying several bioactivities... Sweetpotato[Ipomoea batatas(L.)Lam.],a food crop with both nutritional and medicinal uses,plays essential roles in food security and health-promoting.Chlorogenic acid(CGA),a polyphenol displaying several bioactivities,is distributed in all edible parts of sweetpotato.However,little is known about the specific metabolism of CGA in sweetpotato.In this study,IbPAL1,which encodes an endoplasmic reticulum-localized phenylalanine ammonia lyase(PAL),was isolated and characterized in sweetpotato.CGA accumulation was positively associated with the expression pattern of IbPAL1 in a tissue-specific manner,as further demonstrated by overexpression of IbPAL1.Overexpression of IbPAL1 promoted CGA accumulation and biosynthetic pathway genes expression in leaves,stimulated secondary xylem cell expansion in stems,and inhibited storage root formation.Our results support a potential role for IbPAL1 in sweetpotato CGA biosynthesis and establish a theoretical foundation for detailed mechanism research and nutrient improvement in sweetpotato breeding programs. 展开更多
关键词 Chlorogenic acid Phenylalanine ammonia-lyase(PAL) Secondary metabolism SWEETPOTATO
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The state‑of‑the‑art review on biochar as green additives in cementitious composites:performance,applications,machine learning predictions,and environmental and economic implications
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作者 Ping Ye Binglin Guo +13 位作者 Huyong Qin Cheng Wang Yang Liu Yuyang Chen Pengfei Bian Di Lu Lei Wang Weiping Zhao Yonggan Yang Li Hong Peng Gao peiyong ma Binggen Zhan Qijun Yu 《Biochar》 2025年第1期346-375,共30页
Considerable carbon emissions from the cement industry pose a notable challenge to achieving long-term sustainable development and creating an enriched social environment.Biochar(BC)obtained from biomass pyrolysis can... Considerable carbon emissions from the cement industry pose a notable challenge to achieving long-term sustainable development and creating an enriched social environment.Biochar(BC)obtained from biomass pyrolysis can be used as a carbon-negative material,and it plays a crucial role in the reduction of global carbon emissions.The development of more efficient and cost-effective technologies to fully realize this potential and reduce the environmental impact of BC production and use remains a formidable challenge.The utilization of BC to prepare sustainable cementitious composites with economically value-added benefits has recently attracted much research interest.Therefore,this review analyzes factors influencing the physicochemical properties of BC and their optimization methods,as well as the impact of BC addition on various cement composites and their potential applications.Besides,recent advances in machine learning for predicting the properties of composites and the environmental-economic implications of material are reviewed.The progress and challenges of BC–cement composites are discussed and potential directions for exploration are provided.Therefore,it is recommended to explore commercialization pathways tailored to local conditions and to develop machine learning models for performance prediction and life-cycle analysis,thereby promoting the widespread application of BC in industry and construction. 展开更多
关键词 BIOCHAR CEMENT Carbon neutral APPLICATIONS Machine learning
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