期刊文献+
共找到36,728篇文章
< 1 2 250 >
每页显示 20 50 100
A Demand Forecasting Method Based on Stochastic Frontier Analysis and Model Average: An Application in Air Travel Demand Forecasting
1
作者 ZHANG Xinyu ZHENG Yafei WANG Shouyang 《系统科学与复杂性学报:英文版》 SCIE EI CSCD 2019年第2期615-633,共19页
Demand forecasting is often difficult due to the unobservability of the applicable historical demand series. In this study, the authors propose a demand forecasting method based on stochastic frontier analysis(SFA) mo... Demand forecasting is often difficult due to the unobservability of the applicable historical demand series. In this study, the authors propose a demand forecasting method based on stochastic frontier analysis(SFA) models and a model average technique. First, considering model uncertainty,a set of alternative SFA models with various combinations of explanatory variables and distribution assumptions are constructed to estimate demands. Second, an average estimate from the estimated demand values is obtained using a model average technique. Finally, future demand forecasts are achieved, with the average estimates used as historical observations. An empirical application of air travel demand forecasting is implemented. The results of a forecasting performance comparison show that in addition to its ability to estimate demand, the proposed method outperforms other common methods in terms of forecasting passenger traffic. 展开更多
关键词 Air TRAVEL DEMAND DEMAND forecasting MODEL AVERAGE MODEL uncertainty STOCHASTIC FRONTIER analysis
Characterization and analysis of petrochemical wastewater through particle size distribution, biodegradability, and chemical composition
2
作者 Xiaoqiang Jia Dayao Jin +1 位作者 Chen Li Wenyu Lu 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第2期444-451,共8页
The centralized treatment method is a widely used form of wastewater treatment that tends to be less effective at removing toxic substances. Therefore, a detailed analysis of the composition of wastewater can provide ... The centralized treatment method is a widely used form of wastewater treatment that tends to be less effective at removing toxic substances. Therefore, a detailed analysis of the composition of wastewater can provide important information for the design of an effective wastewater treatment process. The objective of this paper was to investigate particle size distribution(PSD), biodegradability, and the chemical composition of the petrochemical wastewater discharges. For this purpose, this project selected the petrochemical wastewater and treated wastewater of China National Offshore Oil Corporation Zhongjie Petrochemical Co, Ltd. as the analysis objects.The step-by-step filtration method, along with a molecular weight classification method, was selected to build the chemical oxygen demand(COD) and biochemical oxygen demand(BOD) fingerprints of petrochemical wastewater and treated wastewater. The results showed that the main pollutants were settleable particles in petrochemical wastewater, which contributed to over 54.85% of the total COD. The colloidal particles with particle sizes in the range of 450–1000 nm had the highest COD value in the treated wastewater, which contributed34.17% of the total COD of treated wastewater. The results of the BOD analysis showed that the soluble fractions were the main reason that treated wastewaters did not meet the treatment standards. Tests on the organic compounds in petrochemical wastewater found that there were mainly linear paraffins, branched paraffins, benzene series compounds, and some plasticizers in the influent of the petrochemical wastewater. The most abundant pollutants in treated petrochemical wastewater were the adjacent diisobutyl phthalate and the linear alkanes.Fourier transform infrared(FTIR) transmission spectroscopy analysis showed that the settleable particles of petrochemical wastewater and membrane bioreactor(MBR)-treated wastewater contained multiple types of organic substances. The results also indicated that removing the oil-settleable substances, t 展开更多
关键词 PETROCHEMICAL wastewater GRADIENT membrane separation Chemical OXYGEN DEMAND BIOCHEMICAL OXYGEN DEMAND
Personalized real-time pricing for efficient and fair demandresponse in energy cooperatives and highly competitive flexibility markets 预览
3
作者 Georgios TSAOUSOGLOU Nikolaos EFTHYMIOPOULOS +1 位作者 Prodrommos MAKRIS Emmanouel VARVARIGOS 《现代电力系统与清洁能源学报(英文)》 CSCD 2019年第1期151-162,共12页
This paper contributes to the well-known challenge of active user participation in demand side management(DSM).In DSM, there is a need for modern pricing mechanisms that will be able to effectively incentivize selfish... This paper contributes to the well-known challenge of active user participation in demand side management(DSM).In DSM, there is a need for modern pricing mechanisms that will be able to effectively incentivize selfishly behaving users in modifying their energy consumption pattern towards system-level goals like energy efficiency.Three generally desired properties of DSM algorithms are: user satisfaction, energy cost minimization and fairness.In this paper, a personalized real-time pricing(P-RTP) mechanism design framework is proposed that fairly allocates the energy cost reduction only to the users that provoke it.Thus, the proposed mechanism achieves significant reduction of the energy cost without sacrificing at all the welfare(user satisfaction)of electricity consumers.The business model that the proposed mechanism envisages is highly competitive flexibility market environments as well as energy cooperatives. 展开更多
关键词 DEMAND response Smart grid Electricity PRICING Scheduling DEMAND side management PERSONALIZED real-time PRICING ENERGY cooperative
在线阅读 下载PDF
局部均衡理论视角的中国猪肉产品供需预测
4
作者 李苏 宝哲 多春梅 《黑龙江畜牧兽医》 CAS 北大核心 2019年第8期1-7,共7页
中国猪肉产量和消费量持续慢速增长,猪肉供求缺口长期存在。国内猪肉供给有限,随着猪肉价格的上涨进口数量增加,因此中国猪肉供求面临严峻的国内外压力,预测中国未来猪肉产品的供需变化轨迹有较强的现实意义。笔者基于局部均衡模型构建... 中国猪肉产量和消费量持续慢速增长,猪肉供求缺口长期存在。国内猪肉供给有限,随着猪肉价格的上涨进口数量增加,因此中国猪肉供求面临严峻的国内外压力,预测中国未来猪肉产品的供需变化轨迹有较强的现实意义。笔者基于局部均衡模型构建中国猪肉市场供求均衡模型,筛选影响猪肉市场供求的主要因素,预测未来10年中国猪肉市场的供需变化。该模型具有动态、单一产品、单一市场的特征,利用Theil不相等系数进行验证,模型拟合度较高。结果表明:生猪存栏量和猪胴体重均对猪肉供给产生显著正影响;人均羊肉消费量和人均可支配收入水平对人均猪肉消费量产生显著正影响,而猪肉价格对人均猪肉消费量产生显著负影响;社会负面事件对猪肉供给产生显著负影响。消费者对猪肉价格的变化敏感,同时羊肉对猪肉具有一定的替代性。猪肉的进口数量受到国内猪肉消费总量、进口猪肉价格及国内猪肉价格的影响,出口量除了受到国内猪肉价格及猪肉出口价格等因素影响外,还受到汇率、贸易政策等的影响。未来10年,中国生猪存栏量和猪肉产量将持续稳定增长,人均猪肉消费量亦呈现上升趋势,猪肉供求关系逐渐趋于平衡。 展开更多
关键词 局部均衡理论 猪肉 供给 需求 供求缺口 影响因素 预测
浅析二胎政策下0-3岁婴幼儿家庭教养需求 预览
5
作者 洛嘉彤 《教学方法创新与实践(英文)》 2019年第2期177-179,共3页
婴幼儿家庭教养离不开家长的密切配合,同时也离不开社会与政府的力量支持。二胎政策的全面开放使得中国进入了“二孩时代”,越来越多的父母开始意识到婴幼儿家庭教养的重要性,并对婴幼儿家庭教养产生了诸多需求。对此,家长应在社会与政... 婴幼儿家庭教养离不开家长的密切配合,同时也离不开社会与政府的力量支持。二胎政策的全面开放使得中国进入了“二孩时代”,越来越多的父母开始意识到婴幼儿家庭教养的重要性,并对婴幼儿家庭教养产生了诸多需求。对此,家长应在社会与政府的支持下,充分利用各类育儿资源,科学开展婴幼儿家庭教养。 展开更多
关键词 婴幼儿 二胎 家庭教养 需求
在线阅读 免费下载
心内科住院患者陪护管理存在的问题及其整改措施 预览
6
作者 雷红娟 张晶 +4 位作者 刘燕 李淑红 马凌 范多胜 刘军 《西北国防医学杂志》 CAS 2019年第1期56-61,共6页
目的:分析心内科住院患者陪护人员管理难的原因,并探讨整改措施。方法:收集2016-03-01~2017-07-01我院心血管内科收治住院的220例患者的临床资料,其中男120例,女100例,年龄35.5~92.6岁,平均(63.5±3.3)岁;文化程度:初中以下24例,初... 目的:分析心内科住院患者陪护人员管理难的原因,并探讨整改措施。方法:收集2016-03-01~2017-07-01我院心血管内科收治住院的220例患者的临床资料,其中男120例,女100例,年龄35.5~92.6岁,平均(63.5±3.3)岁;文化程度:初中以下24例,初高中116例,中专及以上80例;民族:汉族180例,少数民族40例;居住状况:与子女异地居住130例,与子女同城居住90例;疾病种类:高血压98例,急性心肌梗死23例,心力衰竭25例,心律失常74例。通过入院宣教、询问病情病史、检索病历及随访等整改措施的实施,分析评估陪护家属的外在需求,并对陪护人员管理方面存在的问题进行整改。结果:经过整改,患者心理健康、情绪稳定,能积极配合各项治疗;院内交叉感染率由整改前的(32.0±4.5)%下降至(18.0±2.5)%;患者住院天数由(6.0±1.2)d减少至(4.5±0.8)d;对医护人员的信任度由(88.0±2.2)%增加至(96.0±3.8)%;陪员人数由(4.0±2.0)人/d减至(2.0±1.0)人/d;探视次数由(3.0±2.5)次/d减至(1.0±0.5)次/d,差异均有统计学意义(均P<0.05)。患者住院期间的不良情绪中,孤独选项在患者和陪护人员中所占比例较高,分别为95.4%和80.3%;95.7%的患者和96.8%的陪护人员认为医患直接沟通是缓解不良情绪的最佳方法;75.4%的患者和72.8%的陪护人员表示能遵守现行的陪护制度;在希望解决的问题选择中,70.9%的患者和72.1%的陪护人员首选有效缓解患者不良情绪。结论:通过对陪护管理存在的问题进行分析和整改,陪护人员能积极配合医护人员工作,确保医疗工作正常开展,并且降低院内交叉感染发生率,确保患者安全、安心出院。 展开更多
关键词 陪护管理 需求 分析 整改
在线阅读 免费下载
永磁材料的最新应用进展及其前景分析 预览
7
作者 高华 冯彦刚 《能源与环保》 2019年第1期89-92,共4页
对近年来国内外关于永磁材料的应用进展进行了总结,将永磁材料的研究分成了金属永磁材料、铁氧体永磁材料和稀土永磁材料3个阶段,详细介绍了这3类材料的最新应用进展;通过对我国永磁材料需求数据进行分析,得出我国对永磁材料的需求量远... 对近年来国内外关于永磁材料的应用进展进行了总结,将永磁材料的研究分成了金属永磁材料、铁氧体永磁材料和稀土永磁材料3个阶段,详细介绍了这3类材料的最新应用进展;通过对我国永磁材料需求数据进行分析,得出我国对永磁材料的需求量远大于产量,缺口巨大;智能机器人等新兴行业对永磁材料的需求越来越多,具有良好的发展前景。 展开更多
关键词 永磁材料 应用进展 需求量 产量 前景分析
在线阅读 免费下载
水田无人机施药技术需求与效益分析 预览
8
作者 焦忠恩 《农业科技与装备》 2019年第2期56-57,共2页
沈阳地区水稻植保环节存在机械化程度不高、传统防治方式比重偏大且效率偏低、农药利用率低等问题,亟待推广应用先进高效植保施药技术。从满足农机化战略需求、防控突发性病虫害、填补农村劳动力短缺等方面,分析水田无人机施药作业的技... 沈阳地区水稻植保环节存在机械化程度不高、传统防治方式比重偏大且效率偏低、农药利用率低等问题,亟待推广应用先进高效植保施药技术。从满足农机化战略需求、防控突发性病虫害、填补农村劳动力短缺等方面,分析水田无人机施药作业的技术需求和综合效益,为无人机施药技术的应用提供参考。 展开更多
关键词 无人机 水田 植保 施药 病虫害防治 需求 效益 分析
在线阅读 下载PDF
移动端博物馆电子导览系统的用户需求分析 预览
9
作者 张纾菡 杨喆 《设计艺术研究》 2019年第3期77-80,97共5页
博物馆是传承历史文化的场域,运用电子信息技术构建博物馆导览系统日益重要。以博物馆导览系统为研究对象,采用用户问卷调查的方法,对移动端导览系统的目标群体进行系统分析,探索基于移动端博物馆导览系统的用户需求,可为移动端博物馆... 博物馆是传承历史文化的场域,运用电子信息技术构建博物馆导览系统日益重要。以博物馆导览系统为研究对象,采用用户问卷调查的方法,对移动端导览系统的目标群体进行系统分析,探索基于移动端博物馆导览系统的用户需求,可为移动端博物馆电子导览的系统功能设计提供依据。 展开更多
关键词 移动端 博物馆 导览系统 需求
在线阅读 下载PDF
A Practical Exploration of Academic English Teaching for Non-English Majors in Guilin University of Technology 预览
10
作者 杜雅琳 陈钦 《校园英语》 2019年第21期3-4,共2页
Since entering the 21st century,a series of reforms have taken place in college English teaching in China.Nevertheless,it still cannot satisfy the demand of the students and the development of modern society.Taking Gu... Since entering the 21st century,a series of reforms have taken place in college English teaching in China.Nevertheless,it still cannot satisfy the demand of the students and the development of modern society.Taking Guilin University of Technology as an example,this paper aims to analyze the necessity and feasibility of setting up Academic English courses for non-English majors. 展开更多
关键词 ACADEMIC ENGLISH DEMAND REFORM
在线阅读 下载PDF
增长的底线
11
作者 伍戈 徐剑 +1 位作者 宋陕珊 陈婷婷 《金融市场研究》 2019年第3期1-5,共5页
本文分析了当前中国劳动力供给和需求的变动因素,认为由于人口老龄化加速等因素影响,近年来我国劳动年龄人口的绝对数量持续减少,城镇劳动力供给增速快速收缩,同时经济增速下行使得劳动力需求也在放缓。由于劳动力供给收缩快于劳动力需... 本文分析了当前中国劳动力供给和需求的变动因素,认为由于人口老龄化加速等因素影响,近年来我国劳动年龄人口的绝对数量持续减少,城镇劳动力供给增速快速收缩,同时经济增速下行使得劳动力需求也在放缓。由于劳动力供给收缩快于劳动力需求下滑,因此前期整体失业率不升反降,但局部与结构性失业问题仍难以避免。 展开更多
关键词 劳动力 经济增速 供给 需求
居家养老服务现状、需求与供给侧改革探究 预览
12
作者 陈佳梦 《黑龙江科学》 2019年第15期148-149,共2页
本研究从居家养老服务的现状和需求出发,探究现阶段居家养老服务的供给问题,并利用问卷调查数据,分析居家养老服务需求与供给之间的关系,同时给出实践性意见。
关键词 居家养老服务 需求 供给侧改革
在线阅读 下载PDF
Photodynamic therapy-triggered on-demand drug release from ROS-responsive core-cross-linked micelles toward synergistic anti-cancer treatment
13
作者 Yongjuan Li Jian Hu +6 位作者 Xun Liu Yong Liu Shixian Lv Juanjuan Dang Yong Ji Jinlin He Lichen Yin 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第5期999-1008,共10页
Polymeric micelles have demonstrated wide utility for chemodrug delivery,which however,still suffer from shortcomings such as undesired drug loading,disassembly upon dilution,pre-leakage of drug cargoes during systemi... Polymeric micelles have demonstrated wide utility for chemodrug delivery,which however,still suffer from shortcomings such as undesired drug loading,disassembly upon dilution,pre-leakage of drug cargoes during systemic circulation,and lack of cancer-selective drug release.Herein,a poly(ethylene glycol)(PEG)-polyphosphoester-based,reactive oxygen species (ROS)-responsive,core-cross-linked (CCL) micellar system was developed to encapsulate both chemodrug (doxorubicin,Dox) and photosensitizer (chlorin e6,Ce6).The hydrophobic core of the micelles was cross-linked via a thioketal (TK)-containing linker,which notably enhanced the drug loading and micelle stability.In tumor cells,far-red light irradiation of Ce6 generated ROS to cleave the TK linkers and disrupt the micelle cores.As such,micelles were destabilized and Dox release was promoted,which thereafter imparted synergistic anti-cancer effect with ROS-mediated photodynamic therapy.This study provides an effective approach to realize the precise control over drug loading,formulation stability,and cancer-selective drug release using polymeric micelles,and would render promising utilities for the programmed anti-cancer combination therapy. 展开更多
关键词 core-cross-linked micelles ON-DEMAND drug release photodynamic THERAPY reactive oxygen species (ROS) RESPONSIVENESS SYNERGISTIC an ti-cancer THERAPY
An ecosystem services zoning framework for the permafrost regions of China 预览
14
作者 XU Ling-Xing YANG De-Wei +6 位作者 WU Tong-Hua YI Shu-Hua FANG Yi-Ping XIAO Cun-De LIN Hao-Xi HUANG Jin-Chuan Claudien HABIMANA SIMBI 《气候变化研究进展:英文版》 CSCD 2019年第2期92-98,共7页
The degradation of the permafrost regions, resulting from intensive anthropogenic activities and global warming, has led to the loss of ecosystem services and is threating human well-being. Nevertheless, the real ecos... The degradation of the permafrost regions, resulting from intensive anthropogenic activities and global warming, has led to the loss of ecosystem services and is threating human well-being. Nevertheless, the real ecosystem service values and their complete zoning system in the permafrost regions have received insufficient attention. Research gaps between the identification of permafrost-based ecosystem services and ecosystem management are seriously constraining the development of cryospheric science. Thus, an ecosystem service zoning framework that links ecosystem services with human welfares is proposed to solve the abovementioned challenges in the permafrost regions of China. The three tiered zoning framework for ecosystem services, consisting of zoning goals, principles, hierarchy, methodology, and nomenclature, is proposed for the permafrost regions of China. A combined method, i.e., GIS spatial tools, the location entropy analysis model, and ecosystem services assessment, was employed to distinguish ecosystem conditions, ecosystem service supply, and beneficiaries into these three-grade ecosystem service zones. Hierarchical and dynamic zoning could clarify protection priorities of ecosystems and ecosystem services in terms of regions, grades, and types. The framework could contribute to sustainable management of ecosystem services in the cryosphere. 展开更多
关键词 DEMAND ECOSYSTEM services ECOLOGICAL ZONING PERMAFROST Supply
在线阅读 下载PDF
四川省基层医院急诊医务人员培训现状调查与需求分析
15
作者 江朋 韩存巧 +4 位作者 何亚荣 唐时元 周亚雄 胡俊飞 曹钰 《中华医学教育探索杂志》 2019年第1期101-106,共6页
目的了解四川省基层医院急诊培训现状,发现薄弱环节,为科学开展急诊知识和技能培训提供依据。方法采用随机抽样法及匿名问卷调查法,对四川省9个地区1000名急诊医务人员基本情况、目前培训情况、培训需求展开调查。采用Excel软件对数据... 目的了解四川省基层医院急诊培训现状,发现薄弱环节,为科学开展急诊知识和技能培训提供依据。方法采用随机抽样法及匿名问卷调查法,对四川省9个地区1000名急诊医务人员基本情况、目前培训情况、培训需求展开调查。采用Excel软件对数据进行整理,SPSS17.0软件对数据进行分析。结果本次调查范围覆盖三级、二级及二级以下医院的急诊科医生、护士、技师,总共发出问答1000份,回收983份,问卷回收率达98.3%。被调查人员主要以工作时长达10年以上,本科学历,初、中级职称为主。大部分人每年只有1~2次参加培训的机会(63.1%,620人),参加培训的方式主要为,继续教育(59.0%,580人次)、单位内组织的培训(58.5%,575人次)、卫生行政单位组织的培训(39.3%,386人次)。培训的内容主要有,基础专业技能学习(66.7%,655人次)、基础专业理论学习(59.2%,582人次)、急诊新技术学习(42.5%,418人次)。只有32.0%(314人)的人员认为现阶段的培训基本能满足实际工作需求。导致他们参加培训次数少的因素主要有,单位不安排(36.2%,356人次)、培训与实际工作有差别(31.6%,311人次)、工作无人接替(29.8%,293人次)。其最希望培训的方式是实践操作(60.1%,591人次),最希望的培训内容是急诊急救知识(73.7%,724人次)。不同级别医院在病例讨论、技术观摩、学术讲座、专题学习培训、学习方式的选择差异有统计学意义(P<0.05);而在对专业实践方式的选择差异无统计学意义(P>0.05);而对培训内容的选择在急诊急救知识、全科医学知识、慢性病防治知识、传染病知识、科室管理知识培训内容的选择差异无统计学意义(P>0.05)。而在对护理知识进行培训的选择差异有统计学意义(P<0.05)。结论四川省基层急诊医务人员缺乏急救知识技能培训的现状无法满足其参加培训愿望的需求,制定一个规范、系统、科学的培训模式,提高 展开更多
关键词 基层医院 急诊医务人员 培训 需求
某基层医院护士急救能力培训需求分析 预览
16
作者 章翀 罗俊敏 聂蓉 《医学信息》 2019年第11期188-190,共3页
目的了解基层医院护理人员对急救能力的培训需求,为基层医院护理人员开展急救知识和技能培训方案提供依据。方法采用自行设计的调查问卷对某县级基层医院的141名护理人员对急救培训的内容和方式的需求进行调查。结果6项急救能力需求中,... 目的了解基层医院护理人员对急救能力的培训需求,为基层医院护理人员开展急救知识和技能培训方案提供依据。方法采用自行设计的调查问卷对某县级基层医院的141名护理人员对急救培训的内容和方式的需求进行调查。结果6项急救能力需求中,认为“非常需要”比例占最大的项目为“解决问题”“配合协作”“发现问题”能力需求,其中“技术操作”“理论联系实际”“发现问题”3项“需要”比例大,分别为55.32%、51.06%、47.52%。护士期望的培训方式则以示范教学和短期培训(14.12%)、情景模拟(12.57%)、经验交流(10.83%)为主。不同学历之间的技术操作、不同科室之间的配合协作需要程度比较,差异均有统计学意义(P<0.05)。专科学历护士对技术操作的需求程度高于本科学历护士,普通病房和急诊护士对配合协作能力的非常需要程度均高于ICU,差异具有统计学意义(P<0.05)。结论发现问题在急救能力需求中受到关注,基层护士需要发现疾病问题的能力,也是早期开展急救工作的关键。专科学历护士对技术操作的需求程度较高,普通病房和急诊护士对配合协作能力的需求程度较高,基层护士对急救能力培训方式期望程度依次为示范教学、短期培训、情景模拟、经验交流、案例分析、专题讲座、上级进修等。 展开更多
关键词 护士 急救能力 需求 调查
在线阅读 下载PDF
A Study of Cognition and Demand of Pharmacy Services in Hospitals from the Views of Doctors,Pharmacists and Patients 预览
17
作者 Xu Zhimeng Dong Li 《亚洲社会药学》 2019年第2期77-85,共9页
Objective To study the cognition and demand of pharmacy services in hospitals from the views of doctors,pharmacists and patients and to provide references for improving the quality of pharmacy services.Methods 3 level... Objective To study the cognition and demand of pharmacy services in hospitals from the views of doctors,pharmacists and patients and to provide references for improving the quality of pharmacy services.Methods 3 level 2 hospitals and 3 level 3 hospitals in Beijing were selected and questionnaires for doctors,pharmacists and patients were distributed and collected.Results and Conclusion Cognitively speaking,69.85% of doctors and 75.36% of pharmacists believe that pharmacy services are necessary,and 81.1% of patients believe it is helpful for pharmacists being involved in the process of treatment plans.Doctors and pharmacists themselves believe that the current pharmacist’s service ability is still insufficient,mainly due to the lack of clinical knowledge and the knowledge of medication combination.In terms of demand,doctors and patients have higher demand for pharmacy services,which is mainly involved in designing patient treatment plans,providing drug information and giving medication advice,and providing medication counseling.Doctors,pharmacists and patients all recognize and support the development of pharmacy services.However,in the understanding of the meaning of pharmacy services,doctors are better than pharmacists.Doctors and patients have greater demand for pharmacy services,but the supply of pharmacy services is still far from enough.It is recommended to strengthen the construction of related systems,incorporate pharmacy service work into hospital performance appraisal;attach importance to pharmacy professional talent training,improve pharmacy service ability,explore new hospital pharmacy service mode and to promote hospital pharmacy development. 展开更多
关键词 PHARMACY service COGNITION DEMAND QUESTIONNAIRE
在线阅读 免费下载
国际读者视角中的图书馆发展方向——以江汉大学图书馆为例 预览
18
作者 要红 《高校图书情报论坛》 2019年第2期8-11,29共5页
随着我国对外开放程度的不断加大,高校与国际接轨的速度也愈来愈快,国际间的交流合作也越来越密切。大量的交流合作项目涌人高校,大批的留学生涌人高校,使高校成为国际化发展的一个重要领域。图书馆在此国际化的大背景下,如何应对、如... 随着我国对外开放程度的不断加大,高校与国际接轨的速度也愈来愈快,国际间的交流合作也越来越密切。大量的交流合作项目涌人高校,大批的留学生涌人高校,使高校成为国际化发展的一个重要领域。图书馆在此国际化的大背景下,如何应对、如何发展、如何发挥其作用?通过对国际读者的调查和使用图书馆情况,站在国际读者的视角,探索图书馆在国际化中的发展方向。 展开更多
关键词 国际化 图书馆 国际读者 需求 方向
在线阅读 下载PDF
供需视域下社会主要矛盾转化的丰富内涵 预览
19
作者 杨愉 刘友女 王钊 《宁波大学学报:人文科学版》 2019年第1期88-92,共5页
社会主义初级阶段主要矛盾蕴含着供给与需求的丰富逻辑。供需视域下,社会主要矛盾的转化深刻反映了改革开放以来我国社会生产供给已由“落后的社会生产”转变为生产力水平总体上满足人民物质文化需要的事实。与此同时,供给侧发展不平衡... 社会主义初级阶段主要矛盾蕴含着供给与需求的丰富逻辑。供需视域下,社会主要矛盾的转化深刻反映了改革开放以来我国社会生产供给已由“落后的社会生产”转变为生产力水平总体上满足人民物质文化需要的事实。与此同时,供给侧发展不平衡不充分问题突出,需求侧人民美好生活需要日益增长,二者共同构成了新时代条件下供需失衡的新的社会主要矛盾。 展开更多
关键词 社会主义初级阶段 供给 需求 社会矛盾
在线阅读 免费下载
Analysis of a joint entry-and distance-based cordon pricing scheme:a dynamic modeling approach 预览
20
作者 Mehrdad Gholami Shahbandi Abbas Babazadeh 《现代交通学报:英文版》 2019年第1期25-38,共14页
Transportation demand management(TDM)covers strategies for reducing traffic congestion within the affected urban areas.Congestion pricing includes a branch of TDM strategies;among them,the entry-based cordon pricing,i... Transportation demand management(TDM)covers strategies for reducing traffic congestion within the affected urban areas.Congestion pricing includes a branch of TDM strategies;among them,the entry-based cordon pricing,i.e.,applying charge on entry,is the most popular because of practicality and social acceptance.Many researchers have investigated different second-best approaches for evaluations of cordon pricing plans,mostly by applying static traffic assignment methods.In this paper,a joint entry-and distance-based scheme is proposed to circumvent the deficiencies intrinsic to each.The optimal joint design is considered as the solution to an optimization problem,in which an equilibrium dynamic traffic assignment model is used to take account of flow variations and represent congestion effects more realistically.The problem is solved for the network of Sioux Falls by using an enumeration algorithm,and the solution is compared with those obtained for distinct entry-and distance-based schemes.Based on the results,the joint tolling has the best performance in reducing the total travel time of the travelers and in alleviating the congestion level inside the cordoned area,while generating a higher level of revenue from tolls.Furthermore,the numerical experiments show the unreliability of the results by static against dynamic modeling approach. 展开更多
关键词 Transportation network Traffic DEMAND management Cordon-based CONGESTION PRICING Dynamic user EQUILIBRIUM
在线阅读 下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈