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基于航运周期的班轮航线运力配置优化 被引量:8
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作者 靳志宏 李娜 陈梦 《武汉理工大学学报(交通科学与工程版)》 2012年第2期219-222,共4页
针对航运的周期性特征,研究了处于航运上行期的多航线多船型配船与租船的联合优化问题,以及处于航运下行期的多航线多船型配船与运力闲置的联合优化问题,分别构建了混合整数规划模型,基于模型特点开发了相应的模拟退火算法,通过小规模... 针对航运的周期性特征,研究了处于航运上行期的多航线多船型配船与租船的联合优化问题,以及处于航运下行期的多航线多船型配船与运力闲置的联合优化问题,分别构建了混合整数规划模型,基于模型特点开发了相应的模拟退火算法,通过小规模问题实验确定了模型与算法参数,并通过与Lingo最优解的对比,显示了模型及算法的有效性;同时,现实规模问题的算例分析进一步验证了算法的实用性. 展开更多
关键词 航运周 上行期 下行 航线配船 模拟退火算法
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雅化与俗化──试论中国文学史的分期问题
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作者 黄勇 《钦州学刊》 1998年第3期25-27,共3页
中国文学发展史可以以中唐为约略的临界点,分为前后两期。前期是文学的上行期,后期是文学的下行期。在上行期,文学的发展趋向是不断对文学的民间母体进行雅化,使文学由俚俗转入雅正,由村野升入庙堂。在下行期,文学的发展趋向是由... 中国文学发展史可以以中唐为约略的临界点,分为前后两期。前期是文学的上行期,后期是文学的下行期。在上行期,文学的发展趋向是不断对文学的民间母体进行雅化,使文学由俚俗转入雅正,由村野升入庙堂。在下行期,文学的发展趋向是由庙堂走向市井,由雅正走向通俗化、大众化。中国文学发展史中的这次转型是政治制度、经济形态、哲学思潮以及文学发展自身的内在规定性等诸多因素相互作用的结果。 展开更多
关键词 雅化 俗化 上行期 下行 中国文学史 中唐时
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宏观经济波动与微观家庭决策对居民金融资产选择的影响效果分析 被引量:7
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作者 徐梅 于慧君 《中央财经大学学报》 CSSCI 北大核心 2015年第8期87-93,共7页
居民家庭金融资产选择不仅会受到微观内因的影响,还会受到宏观经济周期波动的影响。笔者将居民的金融资产选择分为储蓄意愿和购买股票或基金意愿,利用2003年第1季度至2014年第1季度的时间序列数据,构建多元GARCH模型,分析外部宏观经济... 居民家庭金融资产选择不仅会受到微观内因的影响,还会受到宏观经济周期波动的影响。笔者将居民的金融资产选择分为储蓄意愿和购买股票或基金意愿,利用2003年第1季度至2014年第1季度的时间序列数据,构建多元GARCH模型,分析外部宏观经济周期波动(GDP增长率、利率)和家庭其他决策(消费意愿、购房意愿)对居民金融资产选择的影响,并且同时分析储蓄意愿和购买股票或基金意愿的相互影响变动,并以GDP增长率的波动周期作为标准,将经济划分为上行和下行两个时期,设置虚拟变量,考虑经济不同运行期间居民金融资产选择对家庭内部决策和外部宏观经济指标的敏感性变化。分析认为,居民家庭金融资产选择仍以储蓄为主,宏观货币调控政策对储蓄意愿影响不大,对购买股票或基金意愿的影响比较大,并且影响效果持续时间长。在经济上行期实行宏观调控政策效果更显著。 展开更多
关键词 家庭金融资产选择 宏观经济波动 家庭决策 多元GARCH模型 经济上行期
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Shanghai's Fashion During Republic Period 被引量:2
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作者 卞向阳 《Journal of Donghua University(English Edition)》 EI CAS 2004年第2期6-17,共12页
The goal of this research is to describe and analyze Shanghai’s fashion during Republic Period. Shanghai’s fashion during Republic Period plays a special role in fashion history of China and Shanghai history. In the... The goal of this research is to describe and analyze Shanghai’s fashion during Republic Period. Shanghai’s fashion during Republic Period plays a special role in fashion history of China and Shanghai history. In the paper, three aspects including the fashion centre of China as well as Far East, men’s fashion and women’s fashion in Shanghai are discussed. The style, textiles, color, decoration and combination of clothing are described. Many costumes from the Clothing Museum at Donghua University and private collections as well as some historical writings, photographs and publications are elucidated and corroborated to give a more detailed description about Shanghai’s fashion during that period.Here are some tentative conclusions. Firstly, Shanghai had always been the fashion center in China even Far East during Republic Period. Modeng was the main reflection of Shanghai fashion. Secondly, the traditional clothing exerted less influence and was less widely used, some kinds and combinations were out of fashion gradually. The fashion was described to be highly stylized, exquisite and concise. Thirdly, the influence of Western Style was further greater. The fashion in Shanghai was almost synchronous with fashion of Paris. Some western clothing was directly used in daily life and the elements of Western Style had an increasingly wide utilization. Fourthly, the New Chinese Style whose representatives were Qipao and Zhongshan Zhuang appeared and popularized in Shanghai. The fashion of Qipao changed frequently. Finally, the fashion in Shanghai called Shanghai Style could be summarized fashionable, exquisite, rapidly changeable, which is harmonious of both ancient and modern, Chinese and foreign. 展开更多
关键词 FASHION CLOTHING Modeng Shanghai Style New Chinese Style Republic Period SHANGHAI
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消费投资利率弹性有限
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作者 盛松成 何雨霖 《财新周刊》 2023年第26期7-7,共1页
在经济上行期,企业资本回报率较高、投融资意愿较强,企业融资需求对利率较敏感,由此投资需求利率弹性较高。而在经济下行期,企业资本回报率较低、投融资意愿不强,加之国企与民企融资环境存在差异,企业融资需求对利率并不敏感,投资利率... 在经济上行期,企业资本回报率较高、投融资意愿较强,企业融资需求对利率较敏感,由此投资需求利率弹性较高。而在经济下行期,企业资本回报率较低、投融资意愿不强,加之国企与民企融资环境存在差异,企业融资需求对利率并不敏感,投资利率弹性并不高。 展开更多
关键词 资本回报率 融资环境 利率弹性 企业融资需求 经济下行 投融资 国企与民企 经济上行期
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都市圈不是越大越好
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作者 连清川 《时代邮刊》 2021年第1期41-41,共1页
曾经有段时间,"逃离北上广"成为风靡一时的概念。当然,在经济上行期内,年轻人窘迫于日常生活的无尽压力和上升路径的艰辛,便开始向往田园牧歌,逃得一时算一时。如今,在紧日子的阴影下,这种声音基本上已经销声匿迹,保卫工作和... 曾经有段时间,"逃离北上广"成为风靡一时的概念。当然,在经济上行期内,年轻人窘迫于日常生活的无尽压力和上升路径的艰辛,便开始向往田园牧歌,逃得一时算一时。如今,在紧日子的阴影下,这种声音基本上已经销声匿迹,保卫工作和生活方式已经成为全部的任务,哪里还敢想着"去丽江浪一浪"呢? 展开更多
关键词 保卫工作 田园牧歌 都市圈 经济上行期 北上广 日常生活 年轻人
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Study on the description method of upper limb's muscle force levels during simulated in-orbit operations
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作者 ZHAO Yan LI DongXu +1 位作者 LIU ZhiZhen LIU Liang 《Science China Chemistry》 SCIE EI CAS 2013年第3期651-657,共7页
The dexterous upper limb serves as the most important tool for astronauts to implement in-orbit experiments and operations. This study developed a simulated weightlessness experiment and invented new measuring equipme... The dexterous upper limb serves as the most important tool for astronauts to implement in-orbit experiments and operations. This study developed a simulated weightlessness experiment and invented new measuring equipment to quantitatively evaluate the muscle ability of the upper limb. Isometric maximum voluntary contractions (MVCs) and surface electromyography (sEMG) signals of right-handed pushing at the three positions were measured for eleven subjects. In order to enhance the com- prehensiveness and accuracy of muscle force assessment, the study focused on signal processing techniques. We applied a combination method, which consists of time-, frequency-, and bi-frequency- domain analyses. Time- and frequency-domain analyses estimated the root mean square (RMS) and median frequency (MDF) of sEMG signals, respectively. Higher order spectra (HOS) of bi-frequency domain evaluated the maximum bispectrum amplitude (Bmax), Gaussianity level (Sg) and lineari- ty level (S0 of sEMG signals. Results showed that B S,, and RMS values all increased as force increased. MDF and Sg val- ues both declined as force increased. The research demonstrated that the combination method is superior to the conventional time- and frequency-domain analyses. The method not only described sEMG signal amplitude and power spectrum, but also deeper characterized phase coupling information and non-Gaussianity and non-linearity levels of sEMG, compared to two conventional analyses. The finding from the study can aid ergonomist to estimate astronaut muscle performance, so as to opti- mize in-orbit operation efficacy and minimize musculoskeletal injuries. 展开更多
关键词 ASTRONAUT SEMG MVC Bi-frequency domain time domain frequency domain
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