检索结果-南通市图书馆

Preparation and Properties of Chinese Lacquer Modified by Methylolureas

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第2期11卷 1003-1016页

作者： Qiang Xiao Yanjun Cao Hailu Tan Qiaoling Feng Xinyue Gu jianhua lyu Hui Xiao Ming Chen Yuzhu Chen College of Forestry Sichuan Agricultural UniversityChengdu611130China Wood Industry and Furniture Engineering Key Laboratory of Sichuan Provinvial Department of Education Sichuan Agricultural UniversityChengdu611130China

In this study,different molar of methylolureas(MMU)were used to improve the properties and drying speed of the raw lacquer(RL).The drying time,gloss,pencil hardness and impact resistance of the lacquer film were *** thermal behaviors and chemical structures of the lacquer membrane were also discussed by thermal gravimetric analysis(TGA),fourier infrared spectrometer(FT-IR)and nuclear magnetic resonance(NMR)analysis,*** results demonstrated that lower molar ratio MMU can significantly improve the properties of *** TGA analysis showed that the modified lacquer had high thermal stability than that of the *** FT-IR and 13C NMR analysis revealed that the structures of the modified lacquer were significantly improved by cross-linking with the hydroxymethyl groups and methylene methyl ethers of *** addition,through scanning electron microscopy(SEM)characterization,it was found that the introduction of MMU can effectively improve the surface smoothness of the lacquer film.

关键词： Raw lacquer methylolureas properties thermal behavior chemical structure

The influence of different heating rates on mortality of Tribolium castaneum(Herbst)(Coleoptera: Tenebrionidae)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Grain & Oil Science and Technology 2020年第2期3卷 64-69页

作者： Yulong Kang jianhua lyu Pengjie Wang Engineering Research Center of Grain Storage and Security of Ministry of Education Grain Storage and Logistics National Engineering LaboratoryZhengzhou 450001China College of Food Science and Technology Henan University of TechnologyZhengzhou 450001China

In order to elucidate the ability of stored product insects to resist high temperature at varying temperature conditions,the influence of different heating rates on the mortality of all life stages of Tribolium castaneum(Herbst)(Coleoptera:Tenebrionidae)was *** acclimation from 28 to 42,44 and 46℃ at different heating rates(0,1.25,2.50,5.00,and 10.00℃/h),eggs,larvae,pupae,and adults of *** were exposed at 50℃ for 0(as a control),10,15,20,25 and 30 min,*** corrected mortality of *** was determined after 24 *** results showed that different exposure times and heating rates had significant effects on the mortality of *** mortality of all life stages of *** with the same acclimation experience increased significantly with the increasing exposure time,and acclimation improved the heat tolerance of *** mortalities exposed at 50℃ for 30 min of *** eggs(acclimated to 46℃ at 5.00℃/h),larvae(acclimated to 44℃ at 2.50℃/h),pupae(acclimated to 46℃ at 5.00℃/h),and adults(acclimated to 46℃ at 2.50℃/h)were 62.50%,54.44%,58.89%and 53.33%,respectively,significantly lower than that of corresponding life stages of *** acclimated at 1.25 and 10.00℃/*** present results are in favor of developing an effective heat treatment protocol for pest control.

关键词： Tribolium castaneum Heat treatment Acclimation High temperature

Influence of low temperature on lethal time extension for different life stages of Cryptolestes ferrugineus (Stephens) with strong resistance to phosphine fumigation

在线全文

学校读者我要写书评

暂无评论

Grain & Oil Science and Technology 2020年第1期3卷 25-28页

作者： Dianxuan Wang Judong Hou Yilin Huang jianhua lyu Collaborative Innovation Center of Henan Grain Crops Henan Collaborative Innovation Center of Grain Storage and SecurityHenan University of TechnologyZhengzhou 450001China

Knowing the time extension degree of full mortality in phosphine fumigation at low temperature significantly contributes to successful insect pest control,especially for reducing fumigation failure and inhibiting resistance *** comparison ofmortality and lethal time on eggs,larvae,pupae and adults of Cryptolestes ferrugineus(Stephens)was conducted,and the strain with 1043 times of resistance factor to phosphine was assayed during fumigation with 300 mL/m^3 of phosphine concentration at 18,23 and 28℃.The LT50 values to eggs,larvae,pupae and adults of *** at 18℃ were postponed by 2,2,1 and 5 d comparedwith that at 23℃,and 5,4,5 and 7 d compared with that at 28℃,*** LT99 values to eggs,larvae,pupae and adults at 18℃ were 5,1,2 and 7 d longer than that at 23℃,and 6,5,5 and 10 d longer than that at 28℃,*** lethal time of different life stages of the *** strain significantly increased with temperature *** exposure time of full mortality on pupae at 300 mL/m^3 of phosphine at 18℃ reached 38 d,which was 12 d longer than that of *** order of tolerance of different life stages of *** exposed to 300 mL/m^3 phosphine from high to low was pupae,eggs,adults,larvae at tested temperatures.

关键词： Cryptolestes ferrugineus Phosphine Stages Low temperature Mortality Lethal time extension

Behavioral Response of Lasioderma serricorne to Materials from Cinnamomum camphora

在线全文

学校读者我要写书评

暂无评论

Grain & Oil Science and Technology 2018年第2期1卷 109-112页

作者： lyu jianhua ZENG Shujing HUO Mingfei ZHANG Yupu KANG Yulong Engineering Research Center of Grain Storage and Security Ministry of Education School of Food Science and Technology Henan University of Technology

The attractiveness of Cinnamomum camphora(Laurales: Lauraceae) blocks and essential oil to Lasioderma serricorne(Fabricius)(Coleoptera: Anobiidae) adults was investigated. The results showed that the behavioral response values of L. serricorne adults to C. camphora blocks significantly increased with increasing doses above the dose of 0.8 g. The highest behavioral response values of L. serricorne adults were 93.33% to C. camphora blocks and 81.67% to C. camphora essential oil, respectively. C. camphora blocks had stronger attractiveness to L. serricorne adults than C. camphora oil. These results demonstrate that the effectiveness to control L. serricorne in practice of C. camphora blocks and C. camphora oil deserve to be further investigated.

关键词： Attractive potential Lasioderma serricorne Cinnamomum camphora Volatiles

Automatic recognition of defects in plasma-facing material using image processing technology

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2023年第12期25卷 122-130页

作者：吕建骅牛春杰崔运秋陈超倪维元范红玉 School of Electrical Engineering Dalian University of TechnologyDalian 116024People’s Republic of China School of Science Jiangnan UniversityWuxi 214122People’s Republic of China

Observing and analyzing surface images is critical for studying the interaction between plasma and irradiated plasma-facing *** paper presents a method for the automatic recognition of bubbles in transmission electron microscope(TEM)images of W nanofibers using image processing techniques and convolutional neural network(CNN).We employ a three-stage approach consisting of Otsu,local-threshold,and watershed segmentation to extract bubbles from noisy *** address over-segmentation,we propose a combination of area factor and radial pixel intensity scanning.A CNN is used to recognize bubbles,outperforming traditional neural network models such as Alex Net and Google Net with an accuracy of 97.1%and recall of 98.6%.Our method is tested on both clear and blurred TEM images,and demonstrates humanlike performance in recognizing *** work contributes to the development of quantitative image analysis in the field of plasma-material interactions,offering a scalable solution for analyzing material ***,this study's findings establish the potential for automatic defect recognition and its applications in the assessment of plasma-material *** method can be employed in a variety of specialties,including plasma physics and materials science.

关键词： image processing automatic defect analysis object detection convolutional neural network

在线全文

学校读者我要写书评

暂无评论

赤拟谷盗成虫为害对小麦挥发性物质的影响

河南工业大学学报（自然科学版） 2022年第4期43卷 106-111页

作者：吕建华黄宗文许俊亚河南工业大学粮油食品学院粮食储藏安全河南省协同创新中心河南郑州450001

为了明确害虫发生与储藏小麦挥发物的关系,采用顶空固相微萃取结合气质联用技术研究了起始虫口密度分别为0、6、12、18头/kg赤拟谷盗成虫为害小麦不同时间后挥发性物质种类、含量及成分的变化情况。结果表明:被赤拟谷盗成虫为害后的小... 详细信息

为了明确害虫发生与储藏小麦挥发物的关系,采用顶空固相微萃取结合气质联用技术研究了起始虫口密度分别为0、6、12、18头/kg赤拟谷盗成虫为害小麦不同时间后挥发性物质种类、含量及成分的变化情况。结果表明:被赤拟谷盗成虫为害后的小麦挥发性物质主要为烃类、醇类、醛类、酸类、酯类和其他物质,小麦被为害20 d时出现了酮类物质;随着为害时间的延长,小麦挥发性物质总含量增加,烃类物质含量随虫口密度的增加先降低后升高,酸类物质含量先升高后降低,醇类和酯类物质含量降低,酮类物质含量略有升高,但变化不明显;不同初始虫口密度赤拟谷盗成虫为害后的小麦主要特征挥发性物质为棕榈酸异丙酯、2-正戊基呋喃、长叶烯、苯乙醛、丙位癸内酯、苯乙酮、2,5,5-三甲基-庚烷。研究结果为通过检测储粮环境挥发物变化预测害虫发生提供了科学依据。

关键词：赤拟谷盗小麦害虫为害特征挥发性化合物

补肾活血汤联合贝那普利治疗慢性肾小球肾炎的效果

在线全文

学校读者我要写书评

暂无评论

中外医学研究 2022年第27期20卷 55-59页

作者：闾建华建始县中医医院湖北建始445300

目的:探讨补肾活血汤联合贝那普利治疗慢性肾小球肾炎(CGN)的效果。方法:选取2018年1月-2019年12月建始县中医医院收治的116例CGN患者。根据随机表将其分为汤利组(n=58)和单利组(n=58)。两组均给予基础治疗,单利组给予贝那普利治疗,汤... 详细信息

目的:探讨补肾活血汤联合贝那普利治疗慢性肾小球肾炎(CGN)的效果。方法:选取2018年1月-2019年12月建始县中医医院收治的116例CGN患者。根据随机表将其分为汤利组(n=58)和单利组(n=58)。两组均给予基础治疗,单利组给予贝那普利治疗,汤利组给予补肾活血汤联合贝那普利治疗。比较两组治疗前后肾功能、炎症因子、临床疗效、不良反应。结果:治疗后,两组24 h尿蛋白定量(24 h UPQ)、血肌酐(Scr)、尿素氮(BUN)、白介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、C反应蛋白(CRP)水平均明显低于治疗前,汤利组24 h UPQ、Scr、BUN、IL-6、TNF-α、CRP水平均明显低于单利组,24 h UPQ、Scr、BUN、IL-6、TNF-α、CRP水平差值均明显高于单利组(P0.05)。结论:补肾活血汤联合贝那普利可有效改善CGN患者肾功能及炎症反应,有利于提高疗效,且安全性好,值得临床推广。

关键词：补肾活血汤贝那普利慢性肾小球肾炎疗效安全性

ZrO_(2)-Al_(2)O_(3)复合氧化物催化反应精馏合成碳酸二甲酯

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

化工进展 2021年第5期40卷 2603-2612页

作者：陶宁徐亚津冯宇辰吕建华刘继东河北工业大学化工学院天津300130

采用共沉淀法制备了一系列不同Al_(2)O_(3)含量的ZrO_(2)-Al_(2)O_(3)复合氧化物,并在催化精馏实验装置中考察了该催化剂在碳酸丙烯酯(PC)与甲醇酯交换制备碳酸二甲酯(DMC)过程中的催化性能。通过X射线衍射(XRD)、红外光谱(FTIR)、X射... 详细信息

采用共沉淀法制备了一系列不同Al_(2)O_(3)含量的ZrO_(2)-Al_(2)O_(3)复合氧化物,并在催化精馏实验装置中考察了该催化剂在碳酸丙烯酯(PC)与甲醇酯交换制备碳酸二甲酯(DMC)过程中的催化性能。通过X射线衍射(XRD)、红外光谱(FTIR)、X射线光电子能谱(XPS)、CO_(2)程序升温脱附(CO_(2)-TPD)和NH_(3)程序升温脱附(NH_(3)-TPD)等手段对所制备的催化剂进行了表征。结果表明,催化剂表面存在的酸碱性位点是制约PC与甲醇酯交换性能的重要因素。复合氧化物中Al_(2)O_(3)含量可以有效调控催化剂的结构特征和表面的酸碱性质,不同于Zr O_(2)或Al_(2)O_(3)单金属催化剂,复合氧化物Zr O_(2)-Al_(2)O_(3)在合成过程中形成了稳定的固溶体结构,导致催化剂表面弱酸量增加,并产生了强碱位点。数据分析表明,催化剂表面的强碱和弱酸含量高时,其催化活性高,说明该反应具有酸碱协同催化作用。当Zr/Al比为1时,弱酸和强碱量均达到最大值,PC的转化率和DMC选择性可达到98.14%和99.96%。催化剂在经过12次循环使用后依旧保持较高的活性,具有良好的结构稳定性。

关键词： ZrO_(2)-Al_(2)O_(3)复合氧化物酯交换碳酸二甲酯酸碱协同

在线全文

学校读者我要写书评

暂无评论

超声波氧化对有机废水预处理的效果研究

辽宁化工 2024年第7期53卷 1035-1037页

作者：吕建华新乡市生态环境局辉县分局河南辉县453600

通过优化超声波功率、溶液pH、氧化剂种类和浓度、反应时间和温度等影响有机废水降解效率的因素,确定最佳预处理条件为:超声功率为150 W,pH为6,加入1%的H_(2)O_(2),预处理反应时间为25 min,反应温度为50℃,COD总去除率稳定在89%左右,其... 详细信息

通过优化超声波功率、溶液pH、氧化剂种类和浓度、反应时间和温度等影响有机废水降解效率的因素,确定最佳预处理条件为:超声功率为150 W,pH为6,加入1%的H_(2)O_(2),预处理反应时间为25 min,反应温度为50℃,COD总去除率稳定在89%左右,其他污染物去除率稳定在80%以上。

关键词：超声波氧化有机废水预处理