期刊文献+
共找到304篇文章
< 1 2 16 >
每页显示 20 50 100
Integrity of the editing and publishing process is the basis for improving an academic journal’s Impact Factor
1
作者 Jin-Lei Wang Xiang Li +8 位作者 Jia-Ru Fan Jia-Ping Yan Ze-Mao Gong Yue Zhao Dong-Mei Wang Li Ma Na Ma Diao-Mei Guo Lian-Sheng Ma 《World Journal of Gastroenterology》 SCIE CAS 2022年第43期6168-6202,共35页
BACKGROUND Journal Impact Factor™(JIF)is often used to evaluate the relative reputation and quality of academic journals in their respective fields,and can greatly influence the quality and scope of subsequent manuscr... BACKGROUND Journal Impact Factor™(JIF)is often used to evaluate the relative reputation and quality of academic journals in their respective fields,and can greatly influence the quality and scope of subsequent manuscript submissions.Therefore,many if not all academic journals are interested in increasing their JIF,to improve their academic impact.AIM To determine the importance of the integrity of the editorial and publication process in improving the academic influence of academic journals and the JIF of academic journals.METHODS In this paper,we describe our statistical analysis of bibliometric factors-including the 2021 JIFs released in the Journal Citation Report™2022,discipline rankings,received and published articles in 2019-2021,and webpage visits and downloads-for seven journals published by Baishideng Publishing Group(Baishideng)and indexed in Science Citation Index Expanded™;ultimately,we introduce and discuss the editing and publishing processes of Baishideng’s journals in their entirety,as they form the basis for our objective of safeguarding and bolstering integrity in academic publication.RESULTS For the seven journals assessed,their 2021 JIFs were basically unchanged from 2020,with the current metric ranging from 5.374 for World Journal of Gastroenterology(WJG)to 1.534 for World Journal of Clinical Cases(WJCC).Further assessments of the journals’bibliometrics from 2019 to 2020,showed that World Journal of Stem Cells has the highest self-citation rate(1.43%)and World Journal of Gastrointestinal Surgery has the lowest(0.21%).Additionally,the total 3012 articles published during this period were cited by more than 20000 articles in approximately 8000 academic journals.Of note,the 1102 articles published in WJG were cited by articles in 3059 journals,among which 171 journals have a JIF of>10,including internationally renowned academic journals such as CA-A Cancer Journal for Clinicians(2021 JIF 286.130,record count:1),Lancet(2021 JIF 202.731,record count:4),Nature Reviews Immunology(2021 JIF 108.555,record count:2),Nature Reviews Gastroenterology&Hepatology(2021 JIF 73.082,record count:9),Lancet Gastroenterology&Hepatology(2021 JIF 45.042,record count:8),Gastroenterology(2021 JIF 33.883,record count:19),and Gut(2021 JIF 31.793,record count:21).This suggests that Baishideng’s journals have been widely recognized for their academic quality.In the Reference Citation Analysis(RCA)database,all seven Baishidengpublished journals obtained a 2022 Journal Article Influence Index(JAII).For example,WJG has a 2022 JAII of 22.048,ranking 18th out of 102 journals in the field of gastroenterology&hepatology in the RCA,with 469909 total citations(6/102)and 21313 total articles(5/102).The numbers of manuscripts received and published in 2021 were both higher than those in 2019-2020.For example,WJCC received a total of 3650 manuscripts in 2021,which is 91.1%higher than those in 2019-2020(average:1910 papers/year).In 2021,WJCC published 1296 articles,representing an increase of 105.1%compared to those in 2019-2020(average:632 articles/year).The numbers of webpage visits and downloads received by the seven journals have increased year by year.For example,the number of total visits received by WJG in 2019-2021 was 1974052 in 2019,2317835 in 2020(increased by 17.4%compared with that in 2019),and 2652555 in 2021(increased by 4.4%compared with that in 2020).The visitors were from more than 220 countries and regions worldwide,such as the United States,China,and the United Kingdom.Open access(OA)plays a vital role in improving the quality,efficiency,transparency,and integrity of academic journal publishing.From 2019 to 2021,a total of 5543 OA articles were published in the seven journals,of which 2083(37.6%)were invited and published free-of-charge.During the same period,1683 articles were published in WJG,and the authors were from more than 70 countries and regions.For the total 5543 articles published in the seven journals from 2019 to 2021,3903 article quality tracking reports were received after the online publication of these articles.The quality of the articles was further evaluated through the Baishideng’s article quality and author evaluation tracking system,with 4655 articles(84.0%)having received author evaluation and feedback,which contributes to tracking metrics for authors’satisfaction with the collective publication processes.From March 25,2021 to June 28,2022,the seven journals received a total of 424 reader evaluations and 229 letters from readers;this subsequent reader engagement demonstrates that the popularity of the published articles and the volume of their readership audience were improved through the reader evaluation system.CONCLUSION Ultimately,the findings from our bibliometric assessments indicate that establishing,promoting and actively practicing processes that safeguard and bolster the integrity of the editing and publication process also help to improve the academic influence of academic journals,which itself is the cornerstone for improving JIF. 展开更多
关键词 Journal impact Factor Academic journal Editing process publishing process Open access Peer review Language polishing Academic influence
下载PDF
High Velocity Impact Experiment on Ti/CFRP/Ti Sandwich Structure 被引量:2
2
作者 还大军 丁冰 +1 位作者 李勇 肖军 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2015年第1期121-127,共7页
Aircraft laminated composite components often suffer a variety of high velocity impacts with large quantity of energy,which usually affects aircraft behavior and would incur component damages,even disastrous consequen... Aircraft laminated composite components often suffer a variety of high velocity impacts with large quantity of energy,which usually affects aircraft behavior and would incur component damages,even disastrous consequences.Therefore,one investigates the impact resistance of a new type of composite material,Ti/CFRP/Ti sandwich structure,and launches impact tests by using an air gun test system.Then one acquires the critical breakthrough rate of the structure and analyzes the damages.The results show that the main failure mode of the front titanium sheet is shear plugging and brittle fracture of adhesive layer with fiber breakage,while the back titanium sheet is severely ripped.The rear damage is worse than the front one.Compared with traditional CFRP laminates,the critical breakthrough rate of Ti/CFRP/Ti sandwich structure is improved by 69.9% when suffered the impact of a bearing ball with 2mm radius. 展开更多
关键词 Ti/CFRP/Ti sandwich structure high velocity impact critical velocity damage mode
下载PDF
Characteristics of Bi-2223 HTS Tapes Under Short-Circuit Current Impacts in Hybrid Energy Transmission Pipelines
3
作者 Yuguang Sun Chao Yin +2 位作者 Weizhen Li Xinyang Li Xiaohua Jiang 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2024年第2期736-745,共10页
A hybrid energy transmission pipeline is proposed with the aim of long-distance cooperative transmission of electricity and chemical fuels, which is composed of an inner high-temperature superconducting (HTS) power ca... A hybrid energy transmission pipeline is proposed with the aim of long-distance cooperative transmission of electricity and chemical fuels, which is composed of an inner high-temperature superconducting (HTS) power cable and outer liquefied natural gas (LNG) pipeline. The flowing LNG could maintain the operating temperature of the inner HTS power cable within the range of 85 K-90 K, thus the Bi-2223 superconductors in the HTS power cable produce little Joule loss with the transmission current below the critical current. Owing to the advantages of high power density, low transmission losses and economical manufacturing costs, the hybrid energy transmission pipeline is expected to be widely utilized in the near future. In order to ensure the safety of the HTS power cable and explosive LNG in case of short-circuit faults, this paper tests and analyzes the characteristics of Bi-2223 HTS tapes of the Type HT-CA, Type HT-SS and Type H models under short-circuit current impacts at the LNG cooling temperature (85 K-90 K). An experimental platform is designed and established for the ampacity tests of HTS tapes above LN2 cooling temperature (77 K). The AC over-current impact tests at 85 K-90 K are carried out on each sample of Bi-2223 tapes respectively, and the experimental results are analyzed and compared to evaluate their performances under different operating conditions. The results indicate that the Type HT-CA tape can withstand 50 Hz short-circuit current impact with the amplitude of 1108 A (10 times of critical current Ic ) for 100 ms at 90 K, and its resistance is the smallest of the three tested samples under similar current impacts. Therefore, the Type HT-CA Bi-2223 tape is the optimal superconductor of the HTS power cable in the hybrid energy transmission pipeline. 展开更多
关键词 Bi-2223 high-temperature superconducting(HTS)tape critical current hybrid energy transmission pipeline liquefied natural gas(LNG)cooling temperature short-circuit current impact characteristics
原文传递
2023:A year of accomplishments for the 13 Science Citation Index Expanded-and Emerging Sources Citation Index-indexed Baishideng journals
4
作者 Jin-Lei Wang Jia-Ping Yan +22 位作者 Jia-Ru Fan Xiang Li Xu Guo Jia-Wei Li Yun-Xiaojian Wu Jing-Jie Wang Yu-Lu Chen Li Li Cong Lin Xin-Liang Qu Ji-Hong Liu Yan-Liang Zhang Ying-Yi Yuan Hua-Ge Yu Yu-Xi Chen Yi-Xuan Cai Xiang-Di Zhang Si Zhao Zi-Hang Xu Li Ma Na Ma Diao-Mei Guo Lian-Sheng Ma 《World Journal of Gastroenterology》 SCIE CAS 2024年第1期9-16,共8页
In 2023,Baishideng Publishing Group(Baishideng)routinely published 47 openaccess journals,including 46 English-language journals and 1 Chinese-language journal.Our successes were accomplished through the collective de... In 2023,Baishideng Publishing Group(Baishideng)routinely published 47 openaccess journals,including 46 English-language journals and 1 Chinese-language journal.Our successes were accomplished through the collective dedicated efforts of Baishideng staffs,Editorial Board Members,and Peer Reviewers.Among these 47 Baishideng journals,7 are included in the Science Citation Index Expanded(SCIE)and 6 in the Emerging Sources Citation Index(ESCI).With the support of Baishideng authors,company staffs,Editorial Board Members,and Peer Reviewers,the publication work of 2023 is about to be successfully completed.This editorial summarizes the 2023 activities and accomplishments of the 13 SCIEand ESCI-indexed Baishideng journals,outlines the Baishideng publishing policy changes and additions made this year,and highlights the unique advantages of Baishideng journals. 展开更多
关键词 Baishideng publishing Group Journal impact Factor Open access Policy changes Policy additions Unique advantages Anxiety disorders Colorectal cancer Inflammatory bowel disease Hepatocellular carcinoma Gut microbes Atrial fibrillation
下载PDF
入选“中国科技期刊卓越行动计划”的领军期刊与重点期刊的出版模式、发展路径与实践成效
5
作者 刘洁 陈金龙 王新英 《天津科技》 2024年第1期66-69,共4页
以“中国科技期刊卓越行动计划”(以下简称“卓越计划”)为背景,重点研究了入选的22种领军期刊及29种重点期刊在发展现状、办刊模式、发展路径、实践成效4个方面的现状与所取得的成效。结果表明,入选期刊均秉承了良好的开放科学理念,从... 以“中国科技期刊卓越行动计划”(以下简称“卓越计划”)为背景,重点研究了入选的22种领军期刊及29种重点期刊在发展现状、办刊模式、发展路径、实践成效4个方面的现状与所取得的成效。结果表明,入选期刊均秉承了良好的开放科学理念,从出版模式的开放获取程度到出版形式的多样性角度考量,都与期刊自身的发展起到了积极的正相关作用。通过Web of Science数据库,获得了2019年和2020年“卓越计划”资助前后期刊影响因子的变化趋势。22种领军期刊的影响因子全部实现了不同程度的提高,提升幅度从3.486%到108.205%不等;29种重点期刊中有26种期刊实现了提升,但也有3种期刊出现了微小的下跌趋势。26种期刊的影响因子的提升幅度从5.663%到78.414%。2022年,影响因子高于5的期刊中,领军期刊占比91%,重点期刊占比66%,且领军期刊中有5种期刊的影响因子高于20,占比23%(集中在细胞与免疫学方面),体现了领军期刊在国际影响力方面的突出成就。 展开更多
关键词 卓越计划 科技期刊 出版 影响因子 领军
下载PDF
我国新闻出版业经济影响与关联效应研究
6
作者 李薇 《北京印刷学院学报》 2024年第4期48-54,共7页
从产业经济学角度,对中国投入产出表中新闻出版业与关联产业的投入和产出数据进行分析,测算新闻出版业的相关经济指标,研究新闻出版业及关联产业间的关系结构、经济影响和波及效应等。研究发现,新闻出版业在国民经济中的经济影响较弱,... 从产业经济学角度,对中国投入产出表中新闻出版业与关联产业的投入和产出数据进行分析,测算新闻出版业的相关经济指标,研究新闻出版业及关联产业间的关系结构、经济影响和波及效应等。研究发现,新闻出版业在国民经济中的经济影响较弱,新闻出版业与其他产业关联广泛,对各产业部门投入占比较为平均。据此对新闻出版业发展提出合理建议。 展开更多
关键词 新闻出版业 产业关联 经济影响 投入产出分析
下载PDF
《宁波职业技术学院学报》2018—2023年主要计量指标分析及发展建议 被引量:1
7
作者 程勇 《宁波职业技术学院学报》 2024年第2期57-65,共9页
运用文献计量内容分析法,对《宁波职业技术学院学报》2018—2023年的载文基本情况、出版时滞、栏目设置、基金论文、核心作者群、影响力指标数据等进行统计分析,发现学报存在部分问题,并提出有针对性地推介与宣传、把控出版时滞、优化... 运用文献计量内容分析法,对《宁波职业技术学院学报》2018—2023年的载文基本情况、出版时滞、栏目设置、基金论文、核心作者群、影响力指标数据等进行统计分析,发现学报存在部分问题,并提出有针对性地推介与宣传、把控出版时滞、优化栏目设置、培养核心作者群、强化向名家约稿等建议,以促进《宁波职业技术学院学报》的发展。 展开更多
关键词 计量指标 出版时滞 栏目设置 基金论文 核心作者群 影响因子 被引频次 量效指数
下载PDF
油滴与高温固体壁面碰撞的流动与传热及飞溅特性
8
作者 黄杨明 陈薄 古忠涛 《西南科技大学学报》 CAS 2024年第1期85-92,共8页
考虑油滴(油膜)/固体壁面接触角动态变化和油液热力学特征参数受温度影响,基于流体体积法建立了油滴与高温固体壁面碰撞的三维流动与传热数值计算模型,通过试验验证了数值计算模型的正确性。基于数值计算模型,分析了油滴碰撞高温固体壁... 考虑油滴(油膜)/固体壁面接触角动态变化和油液热力学特征参数受温度影响,基于流体体积法建立了油滴与高温固体壁面碰撞的三维流动与传热数值计算模型,通过试验验证了数值计算模型的正确性。基于数值计算模型,分析了油滴碰撞高温固体壁面后的流动与传热及飞溅特性,以试验和数值计算结果为基础,建立了描述油膜铺展/飞溅临界判据。结果表明:油滴碰撞高温固体壁面后的状态与碰撞条件有关,破碎、飞溅有利于油膜的铺展流动;二次油滴是油膜边缘破碎产生的油带断裂而成,大直径二次油滴分裂为小直径油滴;随油膜铺展进程,壁面平均热流密度增大,而油膜的径向热流密度则逐渐减小;增大碰撞速度、油滴直径和润滑油温度,有利于油膜的破碎与飞溅,二次油滴数量和下飞溅角均随之增大。 展开更多
关键词 油滴碰撞 高温固体壁面 流动与传热 飞溅特性 飞溅临界
下载PDF
品管圈对心胸外科护士呼吸机报警认知与处理的影响
9
作者 刘鲁艳 贾广娜 《中国卫生标准管理》 2024年第9期185-189,共5页
目的探讨品管圈活动对护士在呼吸机报警认知与处理方面的影响,确保呼吸机治疗的安全。方法采用随机数字表法选取2022年1—5月106例机械通气患者为开展品管圈活动前设为对照组;将2022年6—10月114例机械通气患者为开展品管圈活动后设为... 目的探讨品管圈活动对护士在呼吸机报警认知与处理方面的影响,确保呼吸机治疗的安全。方法采用随机数字表法选取2022年1—5月106例机械通气患者为开展品管圈活动前设为对照组;将2022年6—10月114例机械通气患者为开展品管圈活动后设为观察组。对照组采取传统护理方法,观察组采取品管圈质量改进活动,探讨重症监护室护士对呼吸机报警识别与处理不及时、不正确的原因,从认知、行为、管理及流程4个方面进行分析、讨论,设定目标,制订和实施对策,并对实施的过程进行质控。对比2组相同时间段内呼吸机报警次数、护士处理时间及不良事件发生情况,以及护士掌握报警知识情况。结果心胸外科护士对呼吸机报警原因掌握知晓率由实施前52.50%提高到97.50%;理解呼吸机报警英文意义知晓率由实施前41.25%提高到93.75%;报警处理正确率由实施前56.25%提高到95.65%;在报警次数、护士对报警处理时间方面比较,差异有统计学意义(P<0.05)。结论品管圈活动提高了心胸外科护士对呼吸机报警认知程度和呼吸机报警及时识别与防范处理的能力。 展开更多
关键词 品管圈 心胸外科 重症医学科 呼吸机报警 认知与处理 影响
下载PDF
我国图书对外传播中文化差异的影响及其消解
10
作者 潘文年 戴颖 《出版科学》 北大核心 2024年第2期68-77,共10页
文化差异指因自然地理环境、文化自身进化与变迁、历史传统以及民族性的存在使不同民族、国家的文化都具有自己的独特个性并本能地恒久保持,从而使不同民族、国家的文化呈现出的差异。我国图书对外传播过程中,文化差异影响图书产品的生... 文化差异指因自然地理环境、文化自身进化与变迁、历史传统以及民族性的存在使不同民族、国家的文化都具有自己的独特个性并本能地恒久保持,从而使不同民族、国家的文化呈现出的差异。我国图书对外传播过程中,文化差异影响图书产品的生产制作、图书产品的交易成本以及图书产品对外传播中的区域分布。包括“香蕉人”模式、“混搭-融合”模式和“通适性”模式在内的图书产制模式的推展创新有助于消解文化差异的不利影响,推进我国图书进入西方发达国家主流市场文化障碍的渐次消除。 展开更多
关键词 出版国际传播 文化差异 版权输出 影响
下载PDF
Influence of the connecting condition on the dynamic buckling of longitudinal impact for an elastic rod
11
作者 Xiaojuan Jiao Jianmin Ma 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2017年第3期291-298,共8页
The stress wave propagation law and dynamic buckling critical velocity are formulated and solved by considering a general axial connecting boundary for a slender elastic straight rod impacted by a rigid body. The infl... The stress wave propagation law and dynamic buckling critical velocity are formulated and solved by considering a general axial connecting boundary for a slender elastic straight rod impacted by a rigid body. The influence of connecting stiffness on the critical velocity is investigated with varied impactor mass and buckling time. The influences of rod length and rod mass on the critical velocity are also discussed. It is found that greater connecting stiffness leads to larger stress amplitude, and further results in lower critical velocity. It is particularly noteworthy that when the connecting stiffness is less than a certain value, dynamic buckling only occurs before stress wave reflects off the connecting end. It is also shown that longer rod with larger slenderness ratio is easier to buckle, and the critical velocity for a larger-mass rod is higher than that for a lighter rod with the same geometry. 展开更多
关键词 Elastic rod Longitudinal impact Connecting boundary Stress wave Dynamic buckling Critical velocity
原文传递
Rebound behaviors of droplets impacting on a superhydrophobic surface 被引量:4
12
作者 HU HaiBao CHEN LiBin +1 位作者 HUANG SuHe SONG BaoWei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第5期960-965,共6页
The rebound behaviors of droplets impacting on a self-fabricated superhydrophobic brass surface (WCA=164.5°) were observed and studied by using high-speed-camera. In accordance with energy conversion, theoretical... The rebound behaviors of droplets impacting on a self-fabricated superhydrophobic brass surface (WCA=164.5°) were observed and studied by using high-speed-camera. In accordance with energy conversion, theoretical analysis of different behaviors and rebound mechanism were given. At lower velocities, three behaviors in different velocity ranges were observed: partial rebounding, entire rebounding and ejecting during rebounding. At higher velocities, such two behaviors as rebound after splashing and rebound, ejecting after splashing, occurred alternately and exhibited certain periodicity. A function to predict the critical impact velocity is derived from energy conservation condition, and the prediction values tally with the experimental values, with the maximum relative error about 14%. 展开更多
关键词 行为 疏水表面 液滴 冲击速度 最大相对误差 能量转换 高速摄像机 守恒条件
原文传递
Towards total protection from impact:a viability study using EPE foam to protect falling eggs 被引量:1
13
作者 Gui-Rong Liu Guang Chen Shu-Yong Duan 《Transportation Safety and Environment》 EI 2019年第2期154-163,共10页
Total protection of fragile goods and equipment during transport has become critically important as fast delivery systems are growing rapidly due to the rise of mass online commerce worldwide.This paper therefore stud... Total protection of fragile goods and equipment during transport has become critically important as fast delivery systems are growing rapidly due to the rise of mass online commerce worldwide.This paper therefore studies the protection of falling eggs—one of the most fragile goods—through packaging.Intensive experiments are first conducted to obtain the critical stress at which the eggshell is damaged by falling impact.Tests are first conducted of unpackaged eggs dropping onto a granite platform from various heights.Finite element method(FEM)models of unpackaged eggs are then built to simulate the behaviour of eggs and compute their stress levels.The experimental data is compared with the results of FEM simulations to determine the critical stress at which the eggshell is damaged.A series of tests and numerical simulations are then carried out for eggs wrapped in expanded polyethylene(EPE)foam.The stress distribution of both a single egg and multiple eggs in packaging are studied.An empirical formula between the drop speed(or height)and the bottom thickness of the EPE foam packaging is obtained,which can be useful in the design of packaging for the total protection of eggs that may fall during usual transport and delivery operations.The experimental and numerical results from this study show that it is viable to protect fragile goods,as long as the EPE form packaging has sufficient thickness.The proposed study and design procedure are helpful for the selection of key parameters of foam packaging to protect fragile industry products from impact. 展开更多
关键词 impact protection critical stress EPE foam packaging egg drop test FEM simulation
原文传递
Buffer capacity of granular matter to impact of spherical projectile based on discrete element method
14
作者 Ying YAN Pengfei LI Shunying JI 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2013年第1期50-54,共5页
Granular matter possesses impact-absorbing property due to its energy dissipation character.To investigate the impact-absorbing capacity of granular matter,the discrete element method(DEM)is adopted to simulate the im... Granular matter possesses impact-absorbing property due to its energy dissipation character.To investigate the impact-absorbing capacity of granular matter,the discrete element method(DEM)is adopted to simulate the impact of a spherical projectile on to a granular bed.The dynamic responses of the projectile are obtained for both thin and thick granular bed.The penetration depth of the projectile and the first impact peak are investigated with different bed thicknesses and impact velocities.Determining a suitable bed thickness is crucial to the buffering effect of granular matter.The first impact peak is independent of bed thickness when the thickness is larger than the critical thickness. 展开更多
关键词 granular matter impact peak buffer capacity discrete element method critical thickness
原文传递
科技论文引用时差的调查——基于影响因子和即年指标的比较与分析
15
作者 许强 崔明珠 +1 位作者 罗睿 霍春梅 《沈阳农业大学学报(社会科学版)》 2023年第6期709-714,共6页
以期刊论文为主客体建立两者之间相互引用关系,提出论文引用时差的概念,探讨精细化引文分析和精准化学术评价的可行性途径。以《沈阳农业大学学报》为资料,选择30篇近五年发表的学术论文,通过了解作者引用过程和引用的时间节点,判断作... 以期刊论文为主客体建立两者之间相互引用关系,提出论文引用时差的概念,探讨精细化引文分析和精准化学术评价的可行性途径。以《沈阳农业大学学报》为资料,选择30篇近五年发表的学术论文,通过了解作者引用过程和引用的时间节点,判断作者引用时差,并结合论文发表时差进一步确认论文引用时差。以影响因子和即年指标为例,将以论文为主体的统计结果与以期刊为主体的统计结果进行比较。30篇论文的影响因子分别以期刊和论文为主体,统计出引用前两年出版的期刊分别为130种次和123种次;即年指标分别以期刊和论文为主体,统计出引用当年出版的期刊分别为五种次和71种次。论文引用时差是由作者引用时差和论文发表时差构成的,这是无法避免和不可能消除的客观事实。提出缩短论文发表时差,提升科技期刊载文能力;细化引文分析,精准学术评价;加强论文首发日期标注,做好知识产权保护等对策建议。 展开更多
关键词 论文引用时差 论文发表时差 作者引用时差 影响因子 即年指标
下载PDF
航空座椅动态冲击试验最严酷工况选择研究
16
作者 王亚锋 刘继军 《中国民航大学学报》 CAS 2023年第3期47-52,共6页
为了确定航空座椅动态冲击试验的最严酷工况,本文在研究中国民用航空规章(CCAR,Chinese civil aviation regulations)第25.562条,美国联邦航空管理局(FAA,Federal Aviation Administration)AC 25.562-1B和美国汽车工程师学会(SAE,Societ... 为了确定航空座椅动态冲击试验的最严酷工况,本文在研究中国民用航空规章(CCAR,Chinese civil aviation regulations)第25.562条,美国联邦航空管理局(FAA,Federal Aviation Administration)AC 25.562-1B和美国汽车工程师学会(SAE,Society of Automotive Engineers)AS8049B等相关适航规章和技术标准的基础上,针对某型航空座椅选取位移加载和冲击加载两个阶段开展了危险工况选择的分析和计算,评估了适航试验时各种地板预变形下动态冲击的最严酷工况,并依据此结论完成了适航取证试验。该方法可应用于各种类型航空座椅动态冲击试验前的严酷工况选择。 展开更多
关键词 航空座椅 动态冲击试验 最严酷工况 适航
下载PDF
湿式离合器欠约束摩擦副临界碰摩转速及带排转矩分析
17
作者 张琳 张源盛 +1 位作者 魏超 严运兵 《汽车工程》 EI CSCD 北大核心 2023年第6期1073-1080,964,共9页
带排转矩会降低湿式离合器的传动效率,缩短其使用寿命和降低其工作可靠性。目前针对湿式离合器带排转矩的研究大多基于平均间隙分布模型,但各摩擦副之间的间隙分布对带排转矩有重要影响,且获取处于工作状态的湿式离合器各摩擦副间隙分... 带排转矩会降低湿式离合器的传动效率,缩短其使用寿命和降低其工作可靠性。目前针对湿式离合器带排转矩的研究大多基于平均间隙分布模型,但各摩擦副之间的间隙分布对带排转矩有重要影响,且获取处于工作状态的湿式离合器各摩擦副间隙分布是很困难的。因此,本文提出了一种湿式离合器各摩擦副间隙分布的仿真模拟方法,采用次序统计方法模拟各摩擦片和钢片的位置,获得各摩擦副初始间隙分布规律;在此基础上,通过仿真分析不同工况下欠约束多摩擦副系统的临界碰摩转速及带排转矩,并通过了试验验证。结果表明,在湿式离合器总间隙不变的情况下,欠约束多摩擦副系统的临碰摩转速小于基于平均间隙分布假设下的临界碰摩转速;随着湿式离合器总间隙的增加,临界碰摩转速逐渐下降;欠约束多摩擦副系统的带排转矩明显大于基于平均间隙分布假设下的带排转矩,随着湿式离合器总间隙的增加,带排转矩逐渐下降。 展开更多
关键词 湿式离合器 欠约束摩擦副 带排转矩 临界碰摩转速
下载PDF
HTPE推进剂机械刺激下的安全性研究
18
作者 李扬 徐森 +3 位作者 马腾 徐飞扬 刘静平 白大宇 《火工品》 CAS CSCD 北大核心 2023年第1期63-68,共6页
为研究HTPE推进剂在机械刺激下的安全性,采用BAM撞击感度仪和摩擦感度仪测试了其临界撞击能量和临界摩擦力,参考北约STANAG 4496标准对其进行破片撞击试验,测试其在不同破片撞击速度、不同破片撞击角度下的响应等级。结果表明:该HTPE推... 为研究HTPE推进剂在机械刺激下的安全性,采用BAM撞击感度仪和摩擦感度仪测试了其临界撞击能量和临界摩擦力,参考北约STANAG 4496标准对其进行破片撞击试验,测试其在不同破片撞击速度、不同破片撞击角度下的响应等级。结果表明:该HTPE推进剂的临界撞击能量为7J,其在撞击刺激下的安全性高于常规丁羟推进剂,临界摩擦力为54N,对摩擦刺激敏感;撞击角度90°时,破片速度增大(2100~2300 m/s),HTPE推进剂响应等级均为V类(燃烧);破片速度为1850 m/s、撞击角度60°时,HTPE推进剂响应等级为Ⅲ类(爆炸);撞击角度由90°转为60°时,HTPE推进剂受到的摩擦作用增强,响应等级由燃烧转为爆炸,其破片撞击安全性下降。 展开更多
关键词 HTPE推进剂 临界撞击能量 临界摩擦力 破片速度 撞击角度 响应等级
下载PDF
包覆式活性破片冲击激发临界条件研究
19
作者 赵锐 陈放 《兵器装备工程学报》 CAS CSCD 北大核心 2023年第2期77-81,94,共6页
为研究包覆式活性破片冲击激发速度阈值的影响条件,利用非线性有限元分析软件,对包覆式活性破片的冲击激发过程进行数值模拟,分析了破片结构参数对激发速度阈值的影响,建立了包括壳体头部厚度、侧壁厚度、长径比、壳体材料、靶板材料的... 为研究包覆式活性破片冲击激发速度阈值的影响条件,利用非线性有限元分析软件,对包覆式活性破片的冲击激发过程进行数值模拟,分析了破片结构参数对激发速度阈值的影响,建立了包括壳体头部厚度、侧壁厚度、长径比、壳体材料、靶板材料的经验表达式。实验结果表明:利用该式可对包覆式活性破片冲击激发临界条件进行计算;破片结构对冲击激发速度阈值影响较大,提高壳体密度、侧壁厚,增加长径比,减小壳体头部厚度能有效降低破片冲击激发速度阈值。 展开更多
关键词 活性破片 包覆式 冲击激发 临界条件 数值模拟
下载PDF
《贵州师范学院学报》刊载稿件分析及提升策略研究
20
作者 袁向芬 《贵州师范学院学报》 2023年第10期57-62,共6页
学术期刊是开展学术研究交流的重要平台,是传播思想文化的重要阵地,是促进理论创新和科技进步的重要力量。随着我国市场经济体制的不断成熟,期刊出版市场竞争也日趋激烈。为掌握《贵州师范学院学报》的办刊现状,依据中国知网提供的数据... 学术期刊是开展学术研究交流的重要平台,是传播思想文化的重要阵地,是促进理论创新和科技进步的重要力量。随着我国市场经济体制的不断成熟,期刊出版市场竞争也日趋激烈。为掌握《贵州师范学院学报》的办刊现状,依据中国知网提供的数据,从发文量、基金资助稿件量、影响因子、发文作者地区分布及发文所属学科情况五个方面对《贵州师范学院学报》2013—2022年刊载的稿件情况进行了分析和探讨,并提出了提升期刊质量的对策,以期为今后《贵州师范学院学报》的发展提供参考。 展开更多
关键词 《贵州师范学院学报》 刊载稿件 影响因子 提升策略
下载PDF
上一页 1 2 16 下一页 到第
使用帮助 返回顶部