检索结果-南通市图书馆

Multi-functional layered double hydroxides supported by nanoporous gold toward overall hydrazine splitting

Frontiers of Chemical Science and Engineering 2024年第1期18卷 61-69页

作者： Yongji Qin Huijie Cao Qian Liu Shaoqing Yang Xincai Feng Hao Wang Meiling Lian dongxing zhang Hua Wang Jun Luo Xijun Liu ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110China Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Institute for Advanced Study Chengdu UniversityChengdu 610106China China National Coal Group Corporation Beijing 100120China Tianjin Engineering Research Center of Civil Aviation Energy Environment and Green Development School of Transportation Science and EngineeringCivil Aviation University of ChinaTianjin 300300China

Layered double hydroxides have demonstrated great potential for the oxygen evolution reaction,which is a crucial half-reaction of overall water ***,it remains challenging to apply layered double hydroxides in other electrochemical reactions with high efficiency and ***,we report two-dimensional multifunctional layered double hydroxides derived from metalorganic framework sheet precursors supported by nanoporous gold with high porosity,which exhibit appealing performances toward oxygen/hydrogen evolution reactions,hydrazine oxidation reaction,and overall hydrazine *** as-prepared catalyst only requires an overpotential of 233 mV to reach 10 mA·cm^(-2) toward oxygen evolution *** overall hydrazine splitting cell only needs a cell voltage of 0.984 V to deliver 10 mA·cm^(-2),which is far more superior than that of the overall water splitting system(1.849 V).The appealing performances of the catalyst can be contributed to the synergistic effect between the metal components of the layered double hydroxides and the supporting effect of the nanoporous gold substrate,which could endow the sample with high surface area and excellent conductivity,resulting in superior activity and stability.

关键词： layered double hydroxide oxygen evolution reaction hydrazine oxidation reaction overall hydrazine splitting hydrogen production

来源：

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

离心式高速玉米精量排种器T形槽型孔设计与试验

引用

农业工程学报 2024年第7期40卷 50-60页

作者：杨丽李治民张东兴李川崔涛和贤桃中国农业大学工学院北京100083 农业农村部土壤-机器-植物系统技术重点实验室北京100083

针对离心式高速玉米精量排种器双粒种子并排填充导致重播严重的问题,该研究提出利用型孔槽对称凸台结构降低玉米种子并排填充概率的方法,设计了一种T形槽型孔。通过构建充种阶段玉米种子的力学模型,并结合玉米种子的形状特征确定了T形... 详细信息

针对离心式高速玉米精量排种器双粒种子并排填充导致重播严重的问题,该研究提出利用型孔槽对称凸台结构降低玉米种子并排填充概率的方法,设计了一种T形槽型孔。通过构建充种阶段玉米种子的力学模型,并结合玉米种子的形状特征确定了T形槽型孔基本结构参数。借助EDEM离散元仿真软件,以型孔槽前端长度、型孔槽后端面倾斜角以及型孔槽底部倾斜角为因素,以合格指数、重播指数与漏播指数为评价指标,设计二次正交旋转回归组合仿真试验。仿真试验结果表明:在作业速度18 km/h条件下,型孔槽前端长度为9.31 mm,型孔槽后端面倾斜角为43.37°与型孔槽底部倾斜角为70.5°时,排种质量最优,排种合格指数、重播指数与漏播指数分别为94.03%、1.72%与4.25%。台架验证试验结果表明:作业速度为15 km/h时,T形槽型孔的合格指数最高为95.16%,在此作业速度下,排种器的重播指数为1.42%,漏播指数为3.42%,满足高速精量播种要求;作业速度在12~21 km/h内时,T形槽型孔的平均合格指数为94.77%,相较于矩形槽型孔提升了3.13个百分点,相较于蹄型槽型孔提升了1.80个百分点,T形槽型孔的平均重播指数为2.06%,相较于矩形槽型孔降低了3.41个百分点,相较于蹄型槽型孔降低了2.49个百分点。该研究可为离心式高速玉米精量排种器优化提供参考。

关键词：农业机械仿真玉米高速播种型孔 EDEM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

药食同源物质防治阿尔茨海默病作用机制的研究进展

引用

食品工业科技 2024年第12期45卷 18-27页

作者：康瑶唐瑗张东星王磊王鑫苏子孟於洪建天津中医药大学中药学院天津301617 天津益倍生物集团有限公司天津300457

阿尔茨海默病(Alzheimer's disease,AD)是一种起病隐匿、进行性发展的神经退行性疾病,常见于老年群体且发病率逐年升高,目前仍没有有效的治疗手段。药食同源物质是指既是食品又是中药材的物质,因其安全性和良好的治疗保健效果,受到了广... 详细信息

阿尔茨海默病(Alzheimer's disease,AD)是一种起病隐匿、进行性发展的神经退行性疾病,常见于老年群体且发病率逐年升高,目前仍没有有效的治疗手段。药食同源物质是指既是食品又是中药材的物质,因其安全性和良好的治疗保健效果,受到了广泛的关注。本文阐述了AD的发病机制,从减缓β-淀粉样蛋白沉积、抑制Tau蛋白过度磷酸化、改善胆碱能系统、抗氧化、抗炎和保护神经元和突触等方面总结了药食同源物质抗AD的作用机制,为药食同源物质产品的开发与应用提供参考。

关键词：药食同源物质阿尔茨海默病作用机制

来源：

维普期刊数据库

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

基于信息图-MCKD的高速列车牵引电机轴承故障诊断算法研究

引用

铁道车辆 2024年第4期62卷 140-148页

作者：杨岗杨惠心张东兴西南交通大学机械工程学院四川成都610031 东北大学机械工程与自动化学院辽宁沈阳110013

高速列车牵引电机轴承故障特征微弱且干扰噪声强,为解决电机轴承故障特征难以提取的问题,文章提出了一种基于谱负熵信息图与最大相关峭度解卷积(MCKD)的电机轴承故障诊断方法。首先,对故障轴承振动信号进行基于谱负熵的信息图处理,确定... 详细信息

高速列车牵引电机轴承故障特征微弱且干扰噪声强,为解决电机轴承故障特征难以提取的问题,文章提出了一种基于谱负熵信息图与最大相关峭度解卷积(MCKD)的电机轴承故障诊断方法。首先,对故障轴承振动信号进行基于谱负熵的信息图处理,确定最佳中心频带和带宽,从而对轴承振动信号进行带通滤波;然后,对滤波后的信号采用MCKD方法进行故障特征增强;最后,对故障特征增强后的信号进行包络分析,识别出电机轴承的故障特征。经仿真信号和台架试验数据验证,结果表明,信息图-MCKD方法对牵引电机轴承故障诊断具有良好效果。

关键词：高速列车牵引电机轴承故障诊断谱负熵信息图 MCKD

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of Voids on the Tensile Performance of Carbon/epoxy Fabric Laminates

引用

Journal of Materials Science & Technology 2011年第1期27卷 69-73页

作者： Hongyan Zhu Baochang Wu Dihong Li dongxing zhang Yuyong Chen School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Harbin Aircraft Industry Co. Ltd.Harbin 150060China

This paper aims at investigating the effect of voids on the tensile properties of [（±45）4/（0,90）/（±45）2] S and [（±45）/0 4/（±45）（0,90）] S *** with void contents in the range of 0.4% to 9.0% were fabricated from carbon/epoxy *** void content was determined by ultrasonic attenuation and optical image analysis,and microscopic inspection was also used to analyze the shape and size of the *** influence of voids on the tensile strength and modulus of both stacking sequence is compared in terms of the size and the shape of the *** effect of voids on the initiation and propagation of tensile failure of both stacking sequence composite was investigated.

关键词： Composite Void Tensile strength

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Performance of no-till corn precision planter equipped with row cleaners

引用

International Journal of Agricultural and Biological Engineering 2015年第5期8卷 15-25页

作者： Yang Li zhang Rui Gao Nana Cui Tao Liu Quanwei zhang dongxing College of Engineering China Agricultural UniversityBeijing 100083China

In the continuous annual wheat-corn cropping area of North China Plain,no-till planting that promotes soil conservation and crop yield while reducing operation cost has been gradually accepted by local ***,previous wheat residue is the main limiting factor affecting the performance of existing planters in placing seeds at uniform spacing and optimum depth in residue covered *** order to solve this problem,a kind of ground-wheel-driven row cleaner was designed,developed and mounted on row units of a four-row pneumatic precision *** planter has two adjacent row units equipped with the newly designed row cleaners and the other two adjacent row units equipped with the commonly used inactive row *** was used for planting at three forward speeds(4 km/h,6 km/h and 8 km/h)into half residue(HR)and whole residue(WR)*** amount of residue removal,seeding depth,emergence rate and indices of uniformity in seed spacing(missing-seeding index,quality of feeding index and precision index)were *** newly designed row cleaner performed better with regard to residue removal,with the average percentage of residue cleared as 63.0%compared to 40.3%for the inactive row *** the HR and WR plots,percentage of residue cleared of the newly designed row cleaner reached 57.1%and 68.9%respectively,suggesting that the newly designed row cleaner can work more effectively at high residue *** contrast,with the percentage of residue cleared of the inactive row cleaner as 43.1%and 37.5%in HR and WR plots,suggesting that the inactive row cleaner just can work effectively under low residue *** of missing-seeding index,QFI,precision index,coefficient of variation of depth and percent emergence for the newly designed row cleaner under whole residue level are comparable to those for the inactive row cleaner under half residue *** result indicates that the effect of using the newly designed row cleaner is equal to that of reducin

关键词： row cleaner corn production no-till planter wheat residue management annual double cropping system

来源：

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

Dependence of binaural loudness summation on interaural level difference and frequency for pure tones

引用

Science China(Physics,Mechanics & Astronomy) 2010年第5期53卷 834-841页

作者： zhang Jie & MAO dongxing Institute of Acoustics,Tongji University,Shanghai 200092,China Institute of Acoustics Tongji University Shanghai China

Most of the existing loudness models are based on the diotic listening hypothesis,though human beings always hear in dichotic listening *** this situation,the arithmetic mean of loudness at both ears is usually taken as the approximate value of overall perceived loudness,unaffected by the interaural level difference(ILD).The present work investigated the overall perceived loudness for pure tones in dichotic listening conditions through a subjective *** experimental procedures and systematic errors were investigated to prove the accuracy of the subjective *** results showed that fluctuation was insignificant in the low frequency range,while apparent fluctuation of overall loudness could be observed at a high *** overall loudness deviated from the arithmetic mean value as the ILD became larger.A revised model for overall loudness in dichotic listening conditions was *** proposed model and experiment are consistent.

关键词： dichotic listening subjective experiment interaural level difference overall perceived loudness loudness model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Development of mechatronic driving system for seed meters equipped on conventional precision corn planter

引用

International Journal of Agricultural and Biological Engineering 2015年第4期8卷 1-9页

作者： Yang Li He Xiantao Cui Tao zhang dongxing Shi Song zhang Rui Wang Mantao College of Engineering China Agricultural UniversityBeijing 100083China

Precision planters are more and more widely used for planting corn in *** meters of conventional precision corn planters are usually driven by ground wheel and chain and sprocket system at *** of the slippage of ground wheels and vibration of chains,planting accuracy cannot be ensured,especially at higher forward *** improve the planting performance of precision planters,a mechatronic driving system was designed and its field working performance was evaluated in this research.A two-row pneumatic precision planter was modified to allow simultaneously using two different driving systems,i.e,with one row unit equipped with the newly designed mechatronic driving system and the other row unit equipped with conventional mechanical driving system,and used for planting at three forward speeds(9,11 and 12 km/h)on no-tillage and rotary-tillage *** distances between adjacent seeds in each plot were measured and the indices of uniformity in seed spacing,quality of feeding index(QFI),missing-seeding index and precision index were *** the average 4.70%increase of QFI and 3.54%decrease of missing-seeding index,the mechatronic driving system performed better than the mechanical driving system both on no-tillage and rotary-tillage lands at each forward *** values of QFI,missing-seeding index and precision index of the mechatronic driving system on rotary-tillage land are comparable to those on no-tillage land,by contrast,these indices of the mechanical driving system on rotary-tillage land are significantly worse than those on no-tillage *** result indicates that the mechatronic driving system can eliminate the effect of ground wheel slippage on planting quality and maintain the uniformity of seed *** the QFI,missing-seeding index and precision index become worse with the increase of forward speed,with the worst values of QFI of 89.93%,missing-seeding index of 5.08%and precision index of 18.92%at the highest forwar

关键词： precision planter seed meter mechatronic driving system control motor wheel slippage

来源：

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

枸杞提取物中玉米黄质和叶黄素含量的高效液相测定方法

引用

天津科技 2024年第3期51卷 21-25页

作者：唐瑗康瑶於洪建张东星天津中医药大学天津301617 天津益倍生物科技集团有限公司天津300457

选用色谱柱Innoval ODS-2(4.6 mm×250 mm,5µm),以0.05%三乙胺-乙腈为流动相,流速为0.8 mL/min,柱温为28℃,在450 nm波长处测定样品。结果显示:玉米黄质在0.207~20.7µg/mL范围内线性关系良好,判定系数r^(2)=1.0000,平均回收率为113.72%(n=6),RSD为1.50%,检出限为0.027µg/mL;叶黄素在0.216~21.6µg/mL范围内线性关系良好,判定系数r^(2)=1.0000,平均回收率为105.96%(n=6),RSD为3.78%,检出限为0.056µg/mL。该方法快速、简单稳定、结果准确,适用于同时测定枸杞提取物中叶黄素和玉米黄质。

关键词：高效液相色谱法叶黄素玉米黄质枸杞提取物基线分离

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Remnant fertilizer monitoring system for maize fertilizer applicators

引用

International Journal of Agricultural and Biological Engineering 2023年第5期16卷 173-180页

作者： Yaohui zhang Kailiang zhang Yang Yu dongxing zhang Li Yang Tao Cui Xiantao He College of Engineering China Agricultural UniversityBeijing 100083China The Soil-Machine-Plant key laboratory of the Ministry of Agriculture of China Beijing 100083China

A remnant fertilizer monitoring system utilizing three-dimensional(3D)reconstruction was proposed to detect the amount of remaining fertilizer in the applicator’s *** tests were carried out to compare the performance of four algorithms to estimate the remnant fertilizer amount:fertilizer remnant monitoring biharmonic spline algorithm(V4),natural nearest-neighbor algorithm(Natural),linear algorithm(Linear),cubic algorithm(Cubic).The average relative error for remnant fertilizer monitoring is 7.33%for the Linear algorithm,7.30%for the Natural algorithm,5.18%for the Cubic algorithm,and 4.30%for the V4 *** tests are conducted at three fertilization rates to compare the performances of the V4 and Cubic *** average relative error for discharged fertilizer monitoring is 8.64%for the Cubic algorithm,which is 1.91%lower than that of the V4 *** results show that the Cubic algorithm has the best performance for remnant fertilizer *** average relative error of remnant fertilizer monitoring is 2.42%for the Cubic algorithm,which is 0.43%lower than that of the V4 *** response time of the remnant fertilizer monitoring system is 0.26 *** results demonstrate that the proposed remnant fertilizer monitoring system is highly accurate and suitable for real-time applications.

关键词： maize fertilizer applicator remnant fertilizer monitoring 3D reconstruction solid level detection

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：