检索结果-南通市图书馆

Temperature dependent conductivity of Bi_4Ti_3O_(12) ceramics induced by Sr dopants

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2018年第3期7卷 256-265页

作者： Lin WANG Mengqi GUI Hai-Bo JIN Xinyuan HU yongjie zhao Naseer Muhammad ADNAN Jing-Bo LI Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of Technology

Bi_4Ti_3O_(12) is an important lead-free ferroelectric *** modification of Bi_4Ti_3O_(12)has attracted great attention to improving its *** this work,the effect of Sr dopants on the microstructure,dielectric,and conductivity of Bi_4Ti_3O_(12) ceramic was investigated by XRD,SEM,and AC impedance *** of 1 at%Sr for Bi decreased the grain size,suppressed the dielectric dispersion of Bi_4Ti_3O_(12) ceramic at room temperature,and resulted in different effects on the conductivity of grains and grain *** conductivity of grains in Bi_4Ti_3O_(12) ceramic was increased by the small amount of Sr dopants in the whole experimental temperature *** the grain boundaries of 1 at%Sr-doped Bi_4Ti_3O_(12) exhibited lower conductivity than pure Bi_4Ti_3O_(12) below～380℃and higher conductivity above～380℃.The experimental phenomena were interpreted in term of compensating defects for Sr dopants.

关键词： dielectric impedance analysis electrical properties defects Aurivillius compound

在线全文

学校读者我要写书评

暂无评论

Detergent in China

China Detergent & Cosmetics 2018年第1期3卷 18-21页

作者： zhao yongjie China Information Center of Daily Chemical Industry

Overview In 2016, the total output of soaps and synthetic detergents from domestic enterprises above the scale was more than 13.9 million t, where the output of synthetic detergents was 12.991 million t, with a year-on-year increase of 2.74%compared to that in 2015, which was12.646 t; the output of soaps was nearly 950,000 t, with a year-on-year increase of 5.55%compared to that

关键词：洗涤剂中国化妆品行业发展现状

Statistical Analysis of Raw Materials and Products in China’s Surfactant Industry in 2021

在线全文

学校读者我要写书评

暂无评论

China Detergent & Cosmetics 2022年第3期7卷 10-16页

作者： zhao yongjie Pei Hong China Information Center of Daily Chmical Industry China

According to the statistics of production and marketing data of major enterprises in 2021 by Surfac-tant Committee of China Cleaning Industry Association(CCIA),the development trend of main raw materials and products of surfactant industry is analyzed in *** main trend development trend and characteristics of product structure is discussed under the influence of COVID-19,crude oil price fluctuation and economic structure *** pointed that the direction and planning of high-quality industry and the demand of new market in the 14th *** structure innovation and technological innovation is important.

关键词： wordshigh-quality development surfactant statistical data production and market product structure technological innovation

Group control for procedural rules:parameterized complexity and consecutive domains

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第3期18卷 133-141页

作者： yongjie YANG Dinko DIMITROV Chair of Economic Theory Saarland UniversitySaarbrücken 66123Germany

We consider GROUP CONTROL BY ADDING INDIVIDUALS(GCAI)in the setting of group identification for two procedural rules-the consensus-start-respecting rule and the liberal-start-respecting *** is known that GCAI for both rules are NP-hard,but whether they are fixed-parameter tractable with respect to the number of distinguished individuals remained *** resolve both open problems in the *** addition,we strengthen the NP-hardness of GCAI by showing that,with respect to the natural parameter the number of added individuals,GCAI for both rules are W[2]-***,the W[2]-hardness for the liberal-startrespecting rule holds even when restricted to a very special case where the qualifications of individuals satisfy the so-called consecutive ones ***,for the consensus-startrespecting rule,the problem becomes polynomial-time solvable in this special *** also study a dual restriction where the disqualifications of individuals fulfill the consecutive ones property,and show that under this restriction GCAI for both rules turn out to be polynomial-time *** reductions for showing W[2]-hardness also imply several algorithmic lowerbounds.

关键词： group control by adding individuals group identification parameterized complexity consecutive ones property FPT W-hard

Statistical Analysis of Raw Materials and Products of the Surfactant Industry of China in 2019

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

China Detergent & Cosmetics 2020年第2期5卷 7-14页

作者： Liu Yanhong Pei Hong zhao yongjie China Information Center of Daily Chemical Industry China

According to the statistics of production and marketing data of relevant raw materials and products of enterprises above designated size by the Surfactant Committee of China Cleaning Industry Association(CCIA),the production status and market of main raw materials and products in 2019 were analyzed,and it was pointed out that the trend of traditional raw materials and products in domestic surfactant industry tended to be stable in 2019,with more obvious characteristics of scale and *** was also found that the potential for future market development of specialty products is great because of the rapid growth of production and market,while the feature of high added value contained in needs to be further improved.

关键词： surfactants raw materials products production and sales volume production and market

思维导图与传统PPT在骨科实习生中的教学效果比较

在线全文

学校读者我要写书评

暂无评论

中国高等医学教育 2024年第1期 116-118页

作者：曹海燕高纪彬薛焕云郭颖颖赵永杰滨州医学院附属医院山东滨州256603

目的:比较应用思维导图和传统PPT在骨科实习生中的教学效果。方法:选取2016级在我院实习的临床医学专业3班的学生为受试对象,随机分为试验组(25名)和对照组(26名)。试验组采用思维导图教学法,对照组采用传统PPT课件教学,授课教师、授课... 详细信息

目的:比较应用思维导图和传统PPT在骨科实习生中的教学效果。方法:选取2016级在我院实习的临床医学专业3班的学生为受试对象,随机分为试验组(25名)和对照组(26名)。试验组采用思维导图教学法,对照组采用传统PPT课件教学,授课教师、授课内容、授课学时相同。实习结束后对学生进行理论和技能考试,并对每位学生发放临床思维能力评估量表。结果:试验组和对照组学生的理论考试成绩分别为(91.92±5.47)分、(85.69±6.55)分,技能考试成绩分别为(89.56±4.18)分、(84.38±4.47)分,差异有统计学意义(P<0.05)。试验组和对照组学生的临床思维能力评分分别为(91.84±3.69)分、(76.46±3.68)分,差异有统计学意义(P<0.05)。结论:思维导图教学法的效果优于传统PPT教学法,更有助于医学生临床思维能力的提高。

关键词：思维导图骨科实习临床思维能力

Statistics on China Surfactant Industry in 2015

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

China Detergent & Cosmetics 2016年第2期1卷 16-22页

作者： Yanhong Liu yongjie zhao Hong Pei China Information Center of Daily Chemical Industry

This article discussed the statistical study on products and raw materials of major enterprises in the field of surfactant industry in China. Through a series of data analysis,it has been pointed out that China＇s surfactant industry will usher in a period of eliminating overcapacity and industrial integration in next decades, and mentioning that enterprises should prepare for the risks about market structure change and homogenized competition.

关键词： surfactant product raw material production sales

隐含波动率曲面的预测研究:来自中国台湾市场的证据

在线全文

学校读者我要写书评

暂无评论

系统工程理论与实践 2017年第8期37卷 1949-1962页

作者：陈蓉赵永杰厦门大学经济学院厦门361005 厦门大学管理学院厦门361005

本文采用"两步法"构建了期权隐含波动率曲面的动态模型,并利用该动态模型检验了台指期权隐含波动率曲面的可预测性.结果显示,台指期权隐含波动率曲面无论在统计意义上还是经济意义上都具有可预测性,当在预测过程中加入看涨(看跌)期权市... 详细信息

本文采用"两步法"构建了期权隐含波动率曲面的动态模型,并利用该动态模型检验了台指期权隐含波动率曲面的可预测性.结果显示,台指期权隐含波动率曲面无论在统计意义上还是经济意义上都具有可预测性,当在预测过程中加入看涨(看跌)期权市场净购买压力信息后,台指看涨(看跌)期权隐含波动率曲面的样本外预测效果得到了显著提高,在不考虑交易成本以及合适的交易成本的情形下,依据模型预测结果构建的交易策略能获得正的超额收益.

关键词：隐含波动率曲面净购买压力预测超额收益台指期权

基于微信小程序的家禽“云养殖”平台设计与研究

在线全文

学校读者我要写书评

暂无评论

现代信息科技 2024年第15期8卷 69-73页

作者：窦永昌秦立静赵永杰王宏天任长泽张正东甘肃农业大学甘肃兰州730070

随着科学技术的进步,传统养殖业由于缺乏现代科技和人工智能的应用,面临着一系列严峻的问题,同时,传统的解压方式已无法满足人们日益增长的解压需求。为应对这一挑战,开发了一款名为“云养殖”的微信小程序,倡导“互联网+养殖”的理念,... 详细信息

随着科学技术的进步,传统养殖业由于缺乏现代科技和人工智能的应用,面临着一系列严峻的问题,同时,传统的解压方式已无法满足人们日益增长的解压需求。为应对这一挑战,开发了一款名为“云养殖”的微信小程序,倡导“互联网+养殖”的理念,成功地将网络与养殖业相融合。该小程序将现代养殖理念与日常解压需求有机结合,形成了一种创新的“电商+智慧牧场”智能养殖平台。用户可以通过微信小程序便捷地进行养殖操作,同时享受到智能牧场带来的便利。这一平台不仅为传统养殖业注入新元素,更为用户提供了一种轻松、有趣的养殖体验。

关键词：微信小程序家禽云养殖