检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

路基改良土循环加/卸载试验能量演化研究

路基工程 2024年第4期 69-76页

作者：牛洪军张俊武章希伦赵嘉中交一公局第一工程有限公司北京102205 河北省寒冷地区交通基础设施工程技术创新中心、河北建筑工程学院河北张家口075000

通过循环加/卸载试验,分析公路路基改良土受载时的各能量参数转化规律。结果表明:不同围压下路基改良土的能量转化近似,都呈现峰前能量聚集,破坏能量耗散,峰后残余强度能量重新积聚,但效率和总量低于峰前;围压对峰前路基改良土能量参数... 详细信息

通过循环加/卸载试验,分析公路路基改良土受载时的各能量参数转化规律。结果表明:不同围压下路基改良土的能量转化近似,都呈现峰前能量聚集,破坏能量耗散,峰后残余强度能量重新积聚,但效率和总量低于峰前;围压对峰前路基改良土能量参数影响较小,但少量提升了残余强度时能量聚集的作用;峰前能耗比K随轴向应变的增加而缓慢减小,当土体强度失效时,能耗比K产生突变;能耗比K突变点与应力-时间曲线拐点相对应,说明能耗比可以作为路基改良土三轴应力状态下循环加/卸载作用时的强度失效特征,也可以从能量的角度解释路基改良土的演化破坏规律。

关键词：路基改良土循环加/卸载径向应变能量演化参数比例强度失效判据

苯基取代苯并二噻吩二酮构建新型聚合物及其光伏性能研究

在线全文

学校读者我要写书评

暂无评论

化学学报 2024年第3期82卷 257-264页

作者：邓燧楠刘海珍张连杰罗文君罗妹张泽升梁嘉豪王新康陈军武华南理工大学高分子光电材料与器件研究所发光材料与器件国家重点实验室广州510640

随着材料和器件的不断发展,有机光伏(OPV)的器件效率不断提升,但制备仍存在较多额外加工工艺,不利于其大规模生产.如何合理调控活性层材料的溶解性、结晶性和两相形貌来简化器件制备工艺,实现高性能的as-cast器件将十分具有科学意义.本... 详细信息

随着材料和器件的不断发展,有机光伏(OPV)的器件效率不断提升,但制备仍存在较多额外加工工艺,不利于其大规模生产.如何合理调控活性层材料的溶解性、结晶性和两相形貌来简化器件制备工艺,实现高性能的as-cast器件将十分具有科学意义.本工作通过设计合成苯基取代的苯并二噻吩二酮单元(二维BDD)作为共聚单元,制备了三种新型聚合物材料.当二维BDD单元摩尔分数为10%时, FBDT-m10能实现良好的聚集性能和加工性能,与Y6-BO共混制备的as-cast器件就可以得到良好的活性层形貌,最终实现了71.14%的填充因子及16.06%的器件效率.

关键词：芳香取代苯并二噻吩二酮聚合物给体有机太阳电池

Assembling of a novel 3D Ag(Ⅰ)-MOFs with mixed ligands tactics：Syntheses, crystal structure and catalytic degradation of nitrophenol

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2018年第6期29卷 845-848页

作者： Dandan Huang Xueqian Wua junwu Tian Xiaokun Wang Zhihang Zhou Dongsheng Li College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials Hubei Provincial Collaborative Innovation Center for New Energy Microgrid China Three Gorges University Yichang 443002 China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China

A silver-based metal-organic framework（Ag-MOFs）, [Ag2（H3 ddcba）（dpp）2]（1）（H5 ddcba = 3,5-（di（2’,5’-dicarboxylphenyl）benozoic acid, dpp = 1,3-di（4-pyridyl）propane）, was successfully constructed via hydrothermal assembly of a pentacaboxylate ligand, a N-donor ligand and Ag（I） ions, which possesses a pcu topology and exhibits excellent catalytic properties in aqueous solution for the degradation of onitrophenol（2-NP）, m-nitrophenol（3-NP） and p-nitrophenol（4-NP）. Related kinetics of such catalytic reactions, photoluminescent and thermal stability of compound 1 were also investigated.

关键词： Ag(Ⅰ) metal organic framework Mixed ligands tactics Crystal structure Nitrophenol Catalytic properties

益母草粉对蛋鸡生产性能、血清免疫及抗氧化性能的影响

在线全文

学校读者我要写书评

暂无评论

中国饲料 2024年第4期 17-20页

作者：王丽曹学香于长城张雪赵登福李晓燕李俊武阳谷县畜牧兽医事业发展中心山东阳谷252300 东昌府区畜牧兽医事业发展中心山东聊城252000 聊城职业技术学院山东聊城252000 阳谷县农业农村局山东阳谷252300 阳谷县科技服务中心山东阳谷252300

文章旨在研究益母草粉对蛋鸡生产性能、血清免疫及抗氧化性能的影响。试验将600只40周龄、体重和产蛋率相近的海兰褐壳蛋鸡随机分为4组,每组5个重复,每个重复30只。试验期间,对照组参考蛋鸡营养标准(NRC)配制基础日粮,其余3组分别在基... 详细信息

文章旨在研究益母草粉对蛋鸡生产性能、血清免疫及抗氧化性能的影响。试验将600只40周龄、体重和产蛋率相近的海兰褐壳蛋鸡随机分为4组,每组5个重复,每个重复30只。试验期间,对照组参考蛋鸡营养标准(NRC)配制基础日粮,其余3组分别在基础日粮中添加1、2、3 g/kg益母草粉。试验为期30 d。结果表明:(1)与对照组相比,2 g/kg益母草粉组产蛋率显著提高9.22%(P <0.05),料蛋比显著降低14.75%(P <0.05);1、2、3 g/kg益母草粉组破蛋率显著降低37.95%、42.66%、40.44%(P <0.05)。2)与对照组相比,2、3 g/kg益母草粉组血清免疫球蛋白A含量显著提高60.48%、65.26%(P <0.05),3 g/kg益母草粉组血清免疫球蛋白G含量显著提高34.99%(P <0.05),3 g/kg益母草粉组血清免疫球蛋白M含量显著提高62.74%(P <0.05)。3)与对照组相比,3 g/kg益母草粉组血清总抗氧化能力显著提高了40.50%(P <0.05),2、3 g/kg益母草粉组血清丙二醛含量显著降低21.42%、22.78%(P <0.05)。结论 :基础日粮+2 g/kg益母草粉能提高蛋鸡生产性能;基础日粮+3 g/kg益母草粉能改善蛋鸡血清免疫及抗氧化性能。

关键词：益母草粉蛋鸡生产性能血清免疫抗氧化性能

CorelKit:An Extensible CorelDraw VBA Program for Geoscience Drawing

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2023年第3期34卷 735-757页

作者： junwu Zhang Xian Liang Fangyue Wang Huaikun Wang Yu Fan Te Ba Xiangxi Meng School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Mongolia Zhengyuan Co. LtdJinan 250101China

CorelKit is developed with the built-in VBA environment of CorelDraw?,and is a new plug-in in CorelDraw for geological and geochemical *** can help users quickly and easily draw geological and geochemical graphs,such as scatterplot,triangular scatterplot,line chart,histogram,bar chart,box plot,pie graph,*** order to adapt to the geological application,the above functions are *** and triangular scatterplot provide nearly 150 common basemaps,covering rock classification,structural environment discrimination,mineral genesis,isotope geochemistry,etc.,for the convenience of the user ***,CorelKit further provides a structural joint rose diagram and sulfur isotopic composition *** software also has many practical functions such as Bézier line topology,Multiple Bézier lines close fill,Single inner fill,Correction basemap,Add a compass,Add a scale,which facilitates daily geological *** software has a friendly interface,in both Chinese and English versions,and is suitable for CorelDraw X4 and later *** introduced the Bézier line topology to CorelKit for the first time,which is similar to the GIS®topology for geological *** to the“GB/T 958-2015 Geological Legends Used for Regional Geological Map”,a two-color filling library of rock pattern pictures is established,which is convenient to realize the twocolor filling of sedimentary rocks,metamorphic rocks and magmatic rocks ***,CorelKit makes up for many shortcomings of CorelDraw in geosciences and is a very practical tool for geoscience researchers.

关键词： CorelKit geoscience geochemistry data drawing CorelDraw VBA topology

Low band-gap benzodithiophene-thienothiophenecopolymers: the effect of dual two-dimensional substitutions on optoelectronic properties

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2015年第2期58卷 267-275页

作者： Zhulin Liu Jiangman Sun Yongxiang Zhu Peng Liu Lianjie Zhang junwu Chen Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

Two new conjugated copolymers, PBDT-T6-TTF and PBDT-T12-TTF, were derived from a novel 4-fluorobenzoyl thienothi- ophene （TTF）. In addition, two types of benzodithiophene （BDT） units with 2,3-dihexylthienyl （T6） and 2,3-didodecylthienyl （T12） substituents, respectively, were successfully synthesized. The effect of the dual two-dimensional （2D） substitutions of the building blocks upon the optoelectronic properties of the polymers was investigated. Generally, the two polymers exhibited good solubility and broad absorption, showing similar optical band gaps of ~1.53 eV. However, PBDT-T6-TTF with its shorter alkyl chain length possessed a larger extinction coefficient in thin solid film. The highest occupied molecular orbital （HOMO） level of PBDT-T6-TTF was located at -5.38 eV while that of PBDT-T12-TTF was at -5.51 eV. In space charge-limited- current （SCLC） measurement, PBDT-T6-TTF and PBDT-T12-TTF displayed respective hole mobilities of 3.0~10-~ and 1.6x10 5 cm2 V-1 s-l. In polymer solar cells, PBDT-T6-TTF and PBDT-T12-TTF showed respective power conversion efficiencies （PCEs） of 2.86% and 1.67%. When 1,8-diiodooctane （DIO） was used as the solvent additive, the PCE of PBDT-T6-TTF was remarkably elevated to 4.85%, but the use of DIO for the PBDT-T12-TTF-blend film resulted in a lower PCE of 0.91%. Atomic force microscopy （AFM） indicated that the superior efficiency of PBDT-T6-TTF with 3% DIO （v/v） should be related to the better continuous phase separation of the blend film. Nevertheless, the morphology of the PBDT-T12-TTF deteriorated when the 3% DIO （v/v） was added. Our results suggest that the alkyl-chain length on the 2D BDT units play an important role in determining the optoelectronic properties of dual 2D BDT-TT-based polymers.

关键词： conjugated copolymers benzodithiophene thienothiophene dual 2-dimentional substitutions alkyl side-chain length

Effect of epidermal growth factor on the migration of neural stem cells

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2006年第6期1卷 502-504页

作者： Faliang Duan Guoping Yang junwu Wei Jinglei Wu Department of Neurosurgery First Hospital of Wuhan Wuhan 430022 Hubei Province China

BACKGROUND： Recently, researches on neural stem cells （NSCs） are focus on differentiation and migration ot stem cells. How to regulate and control differentiation and migration of NSCs based on human wills is still a hot topic.OBJECTIVE ： To investigate the effect of epidermal growth factor （EGF） on the migration and proliferation of NSCs and analyze duration of the effect. DESIGN ： Contrast study based on cells SETTING ： Department of Neurological Surgery, the First Hospital of Wuhan MATERIALS： Healthy SD rats aged 13-14 embryonic days. EGF （Sigma Company） METHODS： The experiment was carried out in the Animal Laboratory of Experimental Center Affiliated to the First Hospital of Wuhan from October 2004 to July 2006. NSCs selected from embryonic striatum of rats with 13-14 embryonic days were cultured; 7 days later, suspended neural sphere was used to make simple cell suspension and cultured once more. Then, DMEM-F12＋20 μg/L EGF was added into culture medium; 14 days later, the rats were divided into experimental group and control group. Rats in the experimental group were cultured with the same medium mentioned above; however, rats in the control group were cultured with only DMEM-F12. Migration of cells was observed under microscope every day. MAIN OUTCOME MEASURES： NSCs migration in both experimental group and control group RESULTS： Cell spheres in primary culture were NSCs. In addition, 14 days later, proliferation of stem cells were observed remarkably in EGF culture, and size of cell sphere was about that of 100 cells. In experimental group, proliferation of cell sphere was slow down on the 14^th culture day, and apophysis was erupted to neighbor cell sphere. Moreover, NSCs migrated from big cell sphere to small cell sphere during 14-17 culture days, and then, cell migration was disappeared at 17 days after culture. In control group, cell migration was not observed. CONCLUSION： EGF can induce proliferation and migration of NSCs during a special

关键词： neural stem cells epidermal growth factor primary culture cell suspension culture medium small cell slow down hot topic

Pyrifluquinazon类似物的设计、合成及杀虫活性

在线全文

学校读者我要写书评

暂无评论

农药 2024年第9期63卷 632-638页

作者：王刚梁爽宋玉泉英君伍李斌于海波杨辉斌沈阳中化农药化工研发有限公司新农药创制与开发国家重点实验室农药国家工程研究中心沈阳110021

[目的]寻找具有较高杀蚜虫活性的新化合物。[方法]以pyrifluquinazon为先导化合物,以3-(三氟甲基)-1H-1,2,4-三氮唑、4-氯-3-甲基-1H-吡唑和对氟硝基苯为起始原料,设计、合成了12个pyrifluquinazon类似物,并通过1H NMR和HRMS对其结构进... 详细信息

[目的]寻找具有较高杀蚜虫活性的新化合物。[方法]以pyrifluquinazon为先导化合物,以3-(三氟甲基)-1H-1,2,4-三氮唑、4-氯-3-甲基-1H-吡唑和对氟硝基苯为起始原料,设计、合成了12个pyrifluquinazon类似物,并通过1H NMR和HRMS对其结构进行确证。[结果]初步活性测试结果显示,在100 mg/L剂量下,部分化合物对蚕豆蚜具有一定的杀虫活性,其中化合物13-5对蚕豆蚜的活性为97.2%,优于pyrifluquinazon(91.9%),化合物13-2对蚕豆蚜的活性大于80%。

关键词：喹唑啉酮杀虫活性合成

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

基于BP神经网络的隧道围岩参数反演分析

路基工程 2024年第2期 183-190页

作者：张俊武牛洪军张朋举刘小军中交一公局第一工程有限公司北京102205 河北省土木工程诊断、改造与抗灾重点实验室河北张家口075000 河北省寒冷地区交通基础设施工程技术创新中心河北张家口075000 河北建筑工程学院土木工程学院河北张家口075000

以张家口市东太平山隧道工程项目为背景,基于MIDAS软件建立有限元模型,利用退火算法优化GA-BP神经网络,设计正交试验并构建GASA-BP神经网络,通过隧道拱顶沉降、水平收敛和仰拱隆起3个参数的模拟值对围岩的弹性模量、黏聚力、内摩擦角进... 详细信息

以张家口市东太平山隧道工程项目为背景,基于MIDAS软件建立有限元模型,利用退火算法优化GA-BP神经网络,设计正交试验并构建GASA-BP神经网络,通过隧道拱顶沉降、水平收敛和仰拱隆起3个参数的模拟值对围岩的弹性模量、黏聚力、内摩擦角进行反演分析。结果表明:使用GASA-BP神经网络反演所得到隧道拱顶沉降、水平收敛和仰拱隆起的模拟值,与实测值的最大相差分别为6.60%、19.80%、2.16%;与BP神经网络相比,GASA-BP神经网络整体反演精度更高,反演所得围岩参数精度处于合理区间,在此参数下建立的有限元模型可以对工程实际进行较好地模拟。

关键词：隧道工程破碎围岩神经网络退火算法反演分析正交试验沉降监测围岩参数