期刊文献+

二次检索

题名
关键词
文摘
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息

年份

学科

共找到14篇文章
< 1 >
每页显示 20 50 100
Internal electric field modulation by copper vacancy concentration of cuprous sulfide nanosheets for enhanced selective CO_(2) photoreduction
1
作者 Xian Shi Weidong Dai +4 位作者 Xiaoqian Li Yang Bai qin ren Yao Lei Xing'an Dong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第4期324-330,共7页
Although the internal electric field(IEF)of photocatalysts is acknowledged as a potent driving force for photocharge separation,modulating the IEF intensity to achieve enhanced photocatalytic performances remains a ch... Although the internal electric field(IEF)of photocatalysts is acknowledged as a potent driving force for photocharge separation,modulating the IEF intensity to achieve enhanced photocatalytic performances remains a challenge.Herein,cuprous sulfide nanosheets with different Cu vacancy concentration were employed to study IEF modulation and corresponding direct charge transfer.Among the samples,Cu_(1.8)S nanosheets possessed intensified IEF intensity compared with those of Cu_(2)S and Cu_(1.95)S nanosheets,suggesting that an enhanced IEF intensity could be achieved by introducing more Cu vacancies.This intensified IEF of Cu_(1.8)S nanosheets induced numerous photogenerated electrons to migrate to its surface,and the dissociative electrons were then captured by Cu vacancies,resulting in efficient charge separation spatially.In addition,the Cu vacancies on Cu_(1.8)S nanosheets accumulated electrons as active sites to lower the energy barrier of rate-determining step of CO_(2)photoreduction,leading to the selective conversion of CO_(2)to CO.Herein,the manipulation of IEF intensity through Cu vacancy concentration regulation of cuprous sulfide photocatalysts for efficient charge separation has been discussed,providing a scientific strategy to rationally improve photocata lytic performances for solar energy conversion. 展开更多
关键词 Internal electric field intensity Cuprous sulfide photocatalysts Cu vacancies Charge separation Selective CO_(2) photoreduction
下载PDF
深度学习促发素养生成的过程机制与实现路径
2
作者 杨南昌 覃稔 +1 位作者 梁慧芳 刘晓艳 《开放教育研究》 CSSCI 北大核心 2024年第5期36-46,共11页
在素养导向的教育教学改革中,教师常面临“传授知识还是发展素养”的两难选择。事实上,知识和素养并非两极对立的,关键是如何“化知识为素养”。深度学习作为“过程-结果”的统一体,为核心素养落地提供了有效路径。基于现有文献和学习... 在素养导向的教育教学改革中,教师常面临“传授知识还是发展素养”的两难选择。事实上,知识和素养并非两极对立的,关键是如何“化知识为素养”。深度学习作为“过程-结果”的统一体,为核心素养落地提供了有效路径。基于现有文献和学习科学理论视角,本研究认为深度学习促发“素养生成”是以“知识—素养—行动”为主线、学习者内部认知与外部环境相互作用的过程。其前提是设计基于情境活动的学习经历,通过“情境化与去情境”的迭代学习不断优化学习者面向迁移的认知模型。因此,教师应抓住深度学习“化知识为素养”的内在机制和关键路径,创建技术赋能的真实性学习环境,开展面向迁移和专家思维发展的情境化教学,实施基于整合情境的素养评价,推进课堂教学从传统“知识本位”向“素养导向”的变革。 展开更多
关键词 深度学习 素养生成 机制与路径 真实性学习 情境化与去情境
下载PDF
叉角厉蝽成虫对草地贪夜蛾幼虫的捕食作用研究 被引量:14
3
作者 潘应拿 姚明勇 +4 位作者 付迪 郭峰 覃韧 姜霖 陈文龙 《山地农业生物学报》 2020年第3期23-27,共5页
叉角厉蝽是一种多食性的优势天敌,为系统评估叉角厉蝽对草地贪夜蛾的捕食能力,在室内条件下测试了叉角厉蝽雌、雄成虫对草地贪夜蛾3、4和5龄幼虫的捕食功能反应和种内干扰反应。结果表明:叉角厉蝽雌、雄成虫对草地贪夜蛾3、4和5龄的捕... 叉角厉蝽是一种多食性的优势天敌,为系统评估叉角厉蝽对草地贪夜蛾的捕食能力,在室内条件下测试了叉角厉蝽雌、雄成虫对草地贪夜蛾3、4和5龄幼虫的捕食功能反应和种内干扰反应。结果表明:叉角厉蝽雌、雄成虫对草地贪夜蛾3、4和5龄的捕食功能反应均符合HollingⅡ方程,雌成虫对草地贪夜蛾3、4和5龄捕食功能反应方程分别为Na=1.1592N/(1+0.0194N),Na=0.61065N/(1+0.0124N),Na=0.7757N/(1+0.0529N);雄成虫对草地贪夜蛾3、4和5龄捕食功能反应方程分别为Na=0.9082N/(1+0.01771N),Na=0.4657N/(1+0.01304N),Na=0.93188N/(1+0.1765N)。叉角厉蝽雌、雄成虫对草地贪夜蛾龄幼虫的寻找效应随着猎物密度的增加而下降。叉角厉蝽雌成虫对草地贪夜蛾的捕食作用率随着自身密度的增加而降低,其关系为E=0.3982P-0.3409。 展开更多
关键词 叉角历蝽 草地贪夜蛾 捕食作用 搜寻效应
下载PDF
烟蚜茧蜂对草莓蚜虫的控制效果 被引量:3
4
作者 覃韧 李戎 +2 位作者 潘应拿 周仕涛 陈文龙 《西南师范大学学报(自然科学版)》 CAS 北大核心 2020年第10期49-54,共6页
基于对草莓上蚜虫发生情况的调查,开展了释放不同比例的烟蚜茧蜂Aphidius gifuensis(Ashmead)对草莓上蚜虫的防治效果实验.结果表明,草莓实验地蚜虫优势种为棉蚜,占90%以上,蚜虫在草莓不同部位的分布差异无统计学意义.放蜂后15 d内,蜂蚜... 基于对草莓上蚜虫发生情况的调查,开展了释放不同比例的烟蚜茧蜂Aphidius gifuensis(Ashmead)对草莓上蚜虫的防治效果实验.结果表明,草莓实验地蚜虫优势种为棉蚜,占90%以上,蚜虫在草莓不同部位的分布差异无统计学意义.放蜂后15 d内,蜂蚜比1∶50和1∶100的最大虫口减退率为57.09%和-27.80%,而对应的最高寄生率分别可达20.49%和15.79%.烟蚜茧蜂对草莓上部和下部叶片蚜虫的寄生率高于中部叶片,但差异无统计学意义.研究结果可为有效控制草莓蚜虫提供理论依据. 展开更多
关键词 草莓蚜虫 烟蚜茧蜂 放蜂比例 控制效果
下载PDF
4种萝卜品种作为烟蚜茧蜂载体植物的研究 被引量:1
5
作者 李太美 赵如娜 +3 位作者 郭峰 罗优 覃韧 陈文龙 《西南师范大学学报(自然科学版)》 CAS 北大核心 2020年第10期42-48,共7页
为筛选适宜的萝卜品种作为载体植物扩繁烟蚜茧蜂以防控烟蚜,通过刺吸电位技术(electrical penetration graph, EPG)研究了萝卜蚜在春白玉、满堂红、白天使、满身红4个萝卜品种嫩叶上的取食行为,同时,比较了烟蚜茧蜂上萝卜蚜的寄生率、... 为筛选适宜的萝卜品种作为载体植物扩繁烟蚜茧蜂以防控烟蚜,通过刺吸电位技术(electrical penetration graph, EPG)研究了萝卜蚜在春白玉、满堂红、白天使、满身红4个萝卜品种嫩叶上的取食行为,同时,比较了烟蚜茧蜂上萝卜蚜的寄生率、羽化率以及雌性比.结果表明:萝卜蚜的C波平均持续时间由多到少依次为白天使、满身红、满堂红、春白玉, G波平均持续时间在春白玉品种上最长, E2波平均持续时间在白天使上最长,为274.82 min,在春白玉上次之,为128.05 min;烟蚜茧蜂对春白玉上萝卜蚜的寄生率最高(19.22%),与白天使品种间差异有统计学意义;僵蚜羽化率从大到小依次为满堂红(71.81%)、白天使(68.60%)、春白玉(68.40%)、满身红(66.47%);烟蚜茧蜂雌性比为春白玉(76.67%)最高,与满堂红品种间差异有统计学意义.实验得出相同条件下,萝卜蚜更喜欢取食春白玉品种,春白玉品种可作为载体植物大量扩繁萝卜蚜和烟蚜茧蜂. 展开更多
关键词 刺吸电位技术 载体植物 烟蚜茧蜂 萝卜蚜 萝卜品种
下载PDF
烟蚜茧蜂和菜蚜茧蜂寄生烟蚜时的种间竞争 被引量:2
6
作者 覃韧 陈丹 +6 位作者 赵如娜 姚明勇 罗优 吴学三 姜霖 余春 陈文龙 《山地农业生物学报》 2021年第5期23-27,共5页
烟蚜茧蜂Aphidius gifuensis Ashmaed和菜蚜茧蜂Diaeretiella rapae(M′Intosh)是烟蚜Myzus persicae(Sulzer)的重要寄生蜂。通过比较研究了烟蚜茧蜂和菜蚜茧蜂对烟蚜的寄生特性和种间竞争关系。结果表明,菜蚜茧蜂雌蜂寿命(2.67 d)显著... 烟蚜茧蜂Aphidius gifuensis Ashmaed和菜蚜茧蜂Diaeretiella rapae(M′Intosh)是烟蚜Myzus persicae(Sulzer)的重要寄生蜂。通过比较研究了烟蚜茧蜂和菜蚜茧蜂对烟蚜的寄生特性和种间竞争关系。结果表明,菜蚜茧蜂雌蜂寿命(2.67 d)显著短于烟蚜茧蜂(4.60 d),但羽化率和雌性比显著高于烟蚜茧蜂;两种寄生蜂羽化当天对烟蚜的寄生量最高,随时间的推移呈下降趋势,菜蚜茧蜂最高寄生量是烟蚜茧蜂的2倍。同时接入或单独接入两种蜂对其寄生率和羽化率无显著差异;先释放的寄生蜂的子代数量显著多于后释放的寄生蜂子代数量。释放寄生蜂的时间间隔对先释放的寄生蜂子代数量影响不显著,但显著减少后释放的寄生蜂子代数量。先释放烟蚜茧蜂间隔72 h和先释放菜蚜茧蜂间隔48 h和72 h能显著降低寄生率和羽化率。 展开更多
关键词 烟蚜茧蜂 菜蚜茧蜂 烟蚜 种间竞争
下载PDF
Study of Electroless Ni-P-CNTs Composite Plating 被引量:9
7
作者 Ji-lan Kong Shang-qi Zhou +1 位作者 qin ren Xi Zhang 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2006年第3期259-264,共6页
The electroless Ni-P-carbon nanotubes composite plating was studied on the copper substrate. Metallurgical microscope, scanning electronic microscope, X-ray diffractometer and micro hardness tester were used to study ... The electroless Ni-P-carbon nanotubes composite plating was studied on the copper substrate. Metallurgical microscope, scanning electronic microscope, X-ray diffractometer and micro hardness tester were used to study the structure, constitution and performance of the electroless Ni-P-carbon nanotubes composite deposit. Experiential results show that, with the increment of carbon nanotubes content in electroless plating solution, the grain size on the sample surface decreases whereas the density of grains and the hardness for composite deposit increases. Moreover, adding carbon nanotubes not only improves the degree of crystallization for the composite deposit but also helps their transformation from the amorphous state to the nanocrystal state. 展开更多
关键词 Carbon nanotubes NI-P Electroless composite plating CONSTITUTION STRUCTURE
下载PDF
智能手机用于氯化铜溶液颜色变化的实验探究 被引量:3
8
作者 卢运 许燕红 覃稔 《化学教学》 CAS 北大核心 2019年第8期80-84,共5页
用智能手机设计的简易色度仪对氯化铜溶液在不同浓度、不同温度以及存在其他无色离子的情况下的颜色进行探究,将颜色反映在图像的RGB值上。结果显示,拍摄得到的氯化铜溶液颜色图像的RGB值与氯化铜溶液的浓度和温度成线性关系;氯化铜稀... 用智能手机设计的简易色度仪对氯化铜溶液在不同浓度、不同温度以及存在其他无色离子的情况下的颜色进行探究,将颜色反映在图像的RGB值上。结果显示,拍摄得到的氯化铜溶液颜色图像的RGB值与氯化铜溶液的浓度和温度成线性关系;氯化铜稀溶液呈蓝色,氯化铜浓溶液呈绿色,浓度1.2 mol/L为氯化铜溶液颜色由蓝色系变成绿色系的理论变色浓度;氯化铜稀溶液温度升高时,颜色将由蓝色变成绿色;加入Cl^-离子,溶液绿色加深,加入Na^+、NO3^-、NH4^-等无关离子溶液颜色不变。 展开更多
关键词 氯化铜 溶液颜色 图像RGB值 智能手机 实验探究
下载PDF
Effect of Steam Explosion Technology Main Parameters on Moso Bamboo and Poplar Fiber 被引量:2
9
作者 Biqing Shu qin ren +7 位作者 Lu Hong Zhongping Xiao Xiaoning Lu Wenya Wang Junbao Yu Naiqiang Fu Yiming Gu Jinjun Zheng 《Journal of Renewable Materials》 SCIE EI 2021年第3期585-597,共13页
One of the large-scale industrial applications of Moso bamboo and poplar in China is the production of standardized fiberboard.When making fiberboard,a steam blasting pretreatment without the addition of traditional a... One of the large-scale industrial applications of Moso bamboo and poplar in China is the production of standardized fiberboard.When making fiberboard,a steam blasting pretreatment without the addition of traditional adhesives has become increasingly popular because of its environmental friendliness and wide applicability.In this study,the steam explosion pretreatment of Moso bamboo and poplar was conducted.The steam explosion pressure and holding time were varied to determine the influence of these factors on fiber quality by investigating the morphology of the fiber,the mass ratio of the unexploded specimen at the end face,the chemical composition,and the tensile strength.The following conclusions were drawn:As the steam burst pressure and holding time increased,more cellulose and hemicellulose degradation occurred(the degradation of hemicellulose was greater than that of cellulose),the lignin content rose,and the fiber bundle strength decreased.The degradation of bamboo cellulose was slightly higher than that of poplar,and the degradation of poplar hemicellulose was significantly faster than that of bamboo.Furthermore,increasing the steam explosion pressure and pressure holding time could not effectively increase the lignin content.It is recommended to use a steam blasting pressure of 2.5 MPa or 3.0 MPa and a holding time of 180 s to perform steam blasting on bamboo and poplar specimens. 展开更多
关键词 FIBER binderless fiberboard steam explosion moso bamboo POPLAR
下载PDF
Tensile stress enhanced dynamic oxygen vacancies on interlayer stretched Bi_(2)O_(2)CO_(3) as pivotal knobs to promote sustainable selective CO_(2) photoreduction
10
作者 Xian Shi Weidong Dai +3 位作者 Xing'an Dong qin ren Ping Yan Fan Dong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第8期173-179,I0006,共8页
Surface oxygen vacancies(OVs) with abundant localized electrons on bismuth-oxygen based photocatalysts are proved to have the ability to capture and activate CO_(2).However,the surface OVs are easily filled with oxyge... Surface oxygen vacancies(OVs) with abundant localized electrons on bismuth-oxygen based photocatalysts are proved to have the ability to capture and activate CO_(2).However,the surface OVs are easily filled with oxygen-containing species and destroyed,losing their effects as active sites and hindering the subsequent CO_(2)photoreduction.For realistic and sustainable CO_(2)photoreduction,constructing sustainable and stable surface OVs as active sites on photocatalysts is essential.This work shows the synthesis of interlayer stretched Bi_(2)O_(2)CO_(3) ultrathin nanosheets with tensile stress,which are beneficial to continuously generating light-induced dynamic OVs.With sufficient active sites,excellent,stable,and selective photoreduction of CO_(2)to CO under simulated solar light is achieved.The light-induced OVs can reduce the energy barrier of rate-determining step,resulting in the 100% product selectivity.The results presented herein demonstrate the effect of dynamic OVs induced by interlayer tensile strain on catalysts for the enhanced selective CO_(2)photoreduction process. 展开更多
关键词 Ultrathin Bi_(2)O_(2)CO_(3) Dynamic oxygen vacancies Product selectivity Charge transfer CO_(2) phororeduction
下载PDF
Rapid Energy Exchange between In Situ Formed Bromine Vacancies and CO_(2)Molecules Enhances CO_(2)Photoreduction
11
作者 qin ren Ye He +2 位作者 Hong Wang Yanjuan Sun Fan Dong 《Research》 SCIE EI CSCD 2024年第2期763-771,共9页
Photocatalytic reduction of CO_(2)into fuels provides a prospective tactic for regulating the global carbon balance utilizing renewable solar energy.However,CO_(2)molecules are difficult to activate and reduce due to ... Photocatalytic reduction of CO_(2)into fuels provides a prospective tactic for regulating the global carbon balance utilizing renewable solar energy.However,CO_(2)molecules are difficult to activate and reduce due to the thermodynamic stability and chemical inertness.In this work,we develop a novel strategy to promote the adsorption and activation of CO_(2)molecules via the rapid energy exchange between the photoinduced Br vacancies and CO_(2)molecules.Combining in situ continuous wave-electron paramagnetic resonance(cw-EPR)and pulsed EPR technologies,we observe that the spin-spin relaxation time(T_(2))of BiOBr is decreased by 198 ns during the CO_(2)photoreduction reaction,which is further confirmed by the broadened EPR linewidth.This result reveals that there is an energy exchange interaction between in situ formed Br vacancies and CO_(2)molecules,which promotes the formation of high-energy CO_(2)molecules to facilitate the subsequent reduction reaction.In addition,theoretical calculations indicate that the bended CO_(2)adsorption configuration on the surface of BiOBr with Br vacancies caused the decrease of the lowest unoccupied molecular orbital of the CO_(2)molecule,which makes it easier for CO_(2)molecules to acquire electrons and get activated.In situ diffuse reflectance infrared Fourier transform spectroscopy further shows that the activated CO_(2)molecules are favorably converted to key intermediates of COOH*,resulting in a CO generation rate of 9.1μmol g^(-1)h^(-1)and a selectivity of 100%.This study elucidates the underlying mechanism of CO_(2)activation at active sites and deepens the understanding of CO_(2)photoreduction reaction. 展开更多
关键词 reaction. adsorption activation
原文传递
融入地方特色资源的中学化学教学设计——以“甘蔗的综合利用”为例 被引量:10
12
作者 覃稔 徐潇潇 许燕红 《化学教育(中英文)》 CAS 北大核心 2020年第7期20-26,共7页
以广西蔗糖产业的现状为背景,围绕其特色经济作物甘蔗的综合利用为情境线,设计若干个关键性问题,引导学生从工业生产和生活实际的角度进行思考,学会从糖类物质的结构与性质的层面分析与解释,为国内蔗糖业的健康发展提出解决方案。培养... 以广西蔗糖产业的现状为背景,围绕其特色经济作物甘蔗的综合利用为情境线,设计若干个关键性问题,引导学生从工业生产和生活实际的角度进行思考,学会从糖类物质的结构与性质的层面分析与解释,为国内蔗糖业的健康发展提出解决方案。培养学生解决综合问题的能力,进一步认识化学与生产、生活的关系,感受化学学科在社会发展中的价值。 展开更多
关键词 特色资源 中学化学 甘蔗 糖类 教学设计
原文传递
化学科普图书编写和出版的现状与分析 被引量:3
13
作者 覃稔 许燕红 《化学教育(中英文)》 CAS 北大核心 2020年第11期66-71,共6页
化学科普图书是传播化学知识和化学思想的重要载体。采用内容分析法,以国内线上图书交易平台在售的74种化学科普图书为研究对象,从化学科普图书的出版数量、作者和读者群体、内容类型、形式特征以及用户评价5个维度对化学科普图书进行... 化学科普图书是传播化学知识和化学思想的重要载体。采用内容分析法,以国内线上图书交易平台在售的74种化学科普图书为研究对象,从化学科普图书的出版数量、作者和读者群体、内容类型、形式特征以及用户评价5个维度对化学科普图书进行统计与分析,总结国内在售化学科普图书的现状,挖掘其中存在的问题,并在此基础上提出几点建议。 展开更多
关键词 化学科普图书 出版现状 内容分析
原文传递
Self-doped Br in Bi_(5)O_(7)Br ultrathin nanotubes:Efficient photocatalytic NO purification and mechanism investigation 被引量:1
14
作者 Ping Yan qin ren +5 位作者 Fengyi Zhong Jieyuan Li Fusheng Wei Jianjun Li Xian Shi Fan Dong 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第6期3161-3166,共6页
Bismuth-rich Bi_(5)O_(7)Br is a promising photocatalyst for pollutant removal owing to its stability and appropriate band structure in comparison with bismuth oxybromide.However,bulk-phase Bi_(5)O_(7)Br suffers from p... Bismuth-rich Bi_(5)O_(7)Br is a promising photocatalyst for pollutant removal owing to its stability and appropriate band structure in comparison with bismuth oxybromide.However,bulk-phase Bi_(5)O_(7)Br suffers from poor light absorption and high charge recombination rates resulting in poor activity.Elemental doping is a powerful strategy to enhance photocatalytic activity.In this study,we prepared a series of Br autodoped ultrathin Bi_(5)O_(7)Br nanotubes and explored the effect of Br doping on photocatalytic NO removal.The optimal doping content was determined via a photocatalytic NO removal experiment,which revealed the optimal ratio of Bi and Br was approximately 3:1.In situ diffuse reflectance infrared Fourier transform spectroscopy(In situ DRIFT)and density functional theory(DFT)studies revealed that NO removal mechanism catalyzed by Br doped Bi_(5)O_(7)Br.Our work presents a new strategy for the enhancement of photocatalytic pollutant degradation by bismuth oxyhalide photocatalysts. 展开更多
关键词 Bi_(5)O_(7)Br Br auto-doped Photocatalytic no removal DFT In situ DRIFT
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部