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全球背景下学前教育质量评价与发展路径 被引量:12
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作者 秦金亮 《浙江师范大学学报(社会科学版)》 北大核心 2017年第2期1-9,共9页
全球学前教育质量变革的动力源于人们对高质量学前教育在改变人生命运、坚守社会正义等方面有说服力研究的醒悟。通过评价来把握、提升、改进学前教育质量已形成条件性、结果性、过程性、使能性四种评价路径,它们适用于质量评价的不同阶... 全球学前教育质量变革的动力源于人们对高质量学前教育在改变人生命运、坚守社会正义等方面有说服力研究的醒悟。通过评价来把握、提升、改进学前教育质量已形成条件性、结果性、过程性、使能性四种评价路径,它们适用于质量评价的不同阶段,各有其独特价值。发达国家促进学前教育质量提升已开始充分使用不同评价工具,实现评价多元共存、优势互补的整合效应。我国在学前教育普及中应重视有质量的普及,形成能调动多方积极性的有国际领先水平的质量评价体系。 展开更多
关键词 学前教育质量 全球质量变革 评价发展趋势 使能性评价
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浅谈任务型教学模式在高职英语教学中的应用 被引量:2
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作者 肖华芝 《天津职业大学学报》 2012年第4期86-89,共4页
以高职英语实际课堂教学任务的设计为例,探讨如何将强式任务与弱式任务、交际性任务与使能性任务进行有机整合,以促进任务实效性的实现,达到提高高职英语教学质量的目的。
关键词 任务型教学 强式任务 弱式任务 交际任务 使能性任务
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Comparative analysis of perpetual pavement structures based on pavement performance and life cycle cost 被引量:3
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作者 朱玉琴 倪富健 顾兴宇 《Journal of Southeast University(English Edition)》 EI CAS 2014年第1期84-87,共4页
Pavement performance and economic efficiency are researched on the perpetual test pavement of Yijiang-Suzhou Express Highway in Jiangsu province, China. Test sections were continuously monitored. The conditions and de... Pavement performance and economic efficiency are researched on the perpetual test pavement of Yijiang-Suzhou Express Highway in Jiangsu province, China. Test sections were continuously monitored. The conditions and developing laws of deflection, rutting and cracking are compared among the perpetual pavement with the rich binder layer (RBL), the perpetual pavement without the RBL, and the conventional semi-rigid asphalt pavement in the past eight years after opening for traffic. Economical evaluation is conducted via life cycle cost analysis (LCCA). Based on the performance comparison and LCCA analysis, sections with the RBL have good crack resistance, but they are not very satisfactory in the aspect of permanent deformation; the conventional semi-rigid asphalt pavement is the least economic one due to requiring more frequent maintenance. Research results show that the perpetual pavement without RBL is a more appropriate structure for the test site. 展开更多
关键词 perpetual pavement rich binder layer pavementperformance life cycle cost analysis
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Performance of dual-source CT with high pitch spiral mode for coronary stent patency compared with invasive coronary angiography 被引量:10
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作者 Xia YANG Qiang YU +4 位作者 Wei DONG Zhen-Hong FU Jun-Jue YANG Jun GUO Yun-Dai CHEN 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2016年第10期817-823,共7页
Objective To investigate the performance of dual-source computed tomography (DSCT) using high-pitch spiral fliPS) mode for coronary stents patency. Methods We conducted a prospective study on 120 patients with 260 ... Objective To investigate the performance of dual-source computed tomography (DSCT) using high-pitch spiral fliPS) mode for coronary stents patency. Methods We conducted a prospective study on 120 patients with 260 previous stents implanted due to recurred suspicious symptoms of angina scheduled for invasive coronary angiography (ICA), while DSCT were conducted using HPS mode. Results There was no significant impact of age, body mass index or heat rate (HR) on image quality (P 〉 0.05), while HR variability had a slight impact on that (P 〈 0.05). Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) of DSCT in detection of in-stent restenosis (ISR) based per-patient were 92.3%, 96.7%, 88.9%, and 97.8%, respectively. And those based per-stent were 87%, 96.8%, 83.3%, and 97.7% with un-assessment stents, 97.4%, 99.5%, 97.4%, and 99.5% without un-assessment stents. There was significant differ- ence on sensitivity, specificity, PPV and NPV between diameter 〉 3.0 mm group (93.3%, 97.9%, 87.5%, and 98.9%) and diameter 〈 3.0 mm group (80%, 93.3%, 80.0%, and 93.3%) (P 〈 0.05), and that between stent number 〉 3 group (82.3%, 77.8%, 66.7%, and 60%) with 〈 3 group (97.3%, 80%, 96.5%, and 75%). The effective dose of DSCT (1.4 ± 0.5 mSv) is significantly less than that by invasive coronary angiography [4.0 ± 0.8 mSv (P 〈 0.01)]. Conclusion DSCT using HPS mode provides good diagnostic performance on stent patency with lower effective dose in patients with HR 〈 65 beats/rain. 展开更多
关键词 Coronary angiography High-pitch spiral mode Percutaneous coronary intervention STENT
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A Quantized Kernel Least Mean Square Scheme with Entropy-Guided Learning for Intelligent Data Analysis 被引量:5
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作者 Xiong Luo Jing Deng +3 位作者 Ji Liu Weiping Wang Xiaojuan Ban Jenq-Haur Wang 《China Communications》 SCIE CSCD 2017年第7期127-136,共10页
Quantized kernel least mean square(QKLMS) algorithm is an effective nonlinear adaptive online learning algorithm with good performance in constraining the growth of network size through the use of quantization for inp... Quantized kernel least mean square(QKLMS) algorithm is an effective nonlinear adaptive online learning algorithm with good performance in constraining the growth of network size through the use of quantization for input space. It can serve as a powerful tool to perform complex computing for network service and application. With the purpose of compressing the input to further improve learning performance, this article proposes a novel QKLMS with entropy-guided learning, called EQ-KLMS. Under the consecutive square entropy learning framework, the basic idea of entropy-guided learning technique is to measure the uncertainty of the input vectors used for QKLMS, and delete those data with larger uncertainty, which are insignificant or easy to cause learning errors. Then, the dataset is compressed. Consequently, by using square entropy, the learning performance of proposed EQ-KLMS is improved with high precision and low computational cost. The proposed EQ-KLMS is validated using a weather-related dataset, and the results demonstrate the desirable performance of our scheme. 展开更多
关键词 quantized kernel least mean square (QKLMS) consecutive square entropy data analysis
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Cost-benefit timing for applying slurry seal on actual roadway tests in China 被引量:3
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作者 支喜兰 王威娜 蔡宜长 《Journal of Central South University》 SCIE EI CAS 2012年第8期2394-2402,共9页
Determining the optimal timing is the core of preventive maintenance. Highway agencies always face with the challenge of determining optimal timing for preventive maintenance, particularly in China where there are no ... Determining the optimal timing is the core of preventive maintenance. Highway agencies always face with the challenge of determining optimal timing for preventive maintenance, particularly in China where there are no condition indicators designed for determining adequate timing for applying preventive maintenance and little literature relating to the development of pavement performance. This work presented the indicators, including crack ratio (Rc), rutting depth (DR), international roughness index (IIR) and sideway force coefficient (CsF) to determine the adequate timing for preventive maintenance in China. The proper ranges of each indicator to apply to preventive maintenance were then recommended. They are 0.28%-1.4% for Rc, 10-15 mm for DR, 1.97-3.5 for lrR, 40--50 for CSF. Based on pavement condition survey data collected on the test roads in Hebei Province, China, on the application of slurry seal at different timings, the pavement performance was established and the adequate timings for applying slurry seal was studied. Based on benefit-cost analysis, it is suggested that the fourth year is the optimal timing for applying slurry seal based on the condition in China. A framework is established to determine the adequate timings of applying other preventive maintenance methods. 展开更多
关键词 preventive maintenance evaluation system cost-benefit timing slurry seal
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Region Pair Grey Difference Classifier for Face Detection 被引量:1
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作者 欧凡 刘冲 欧宗瑛 《Transactions of Tianjin University》 EI CAS 2010年第2期118-122,共5页
A new kind of region pair grey difference classifier was proposed. The regions in pairs associated to form a feature were not necessarily directly-connected, but were selected dedicatedly to the grey transition betwee... A new kind of region pair grey difference classifier was proposed. The regions in pairs associated to form a feature were not necessarily directly-connected, but were selected dedicatedly to the grey transition between regions coinciding with the face pattern structure. Fifteen brighter and darker region pairs were chosen to form the region pair grey difference features with high discriminant capabilities. Instead of using both false acceptance rate and false rejection rate, the mutual information was used as a unified metric for evaluating the classifying performance. The parameters of specified positions, areas and grey difference bias for each single region pair feature were selected by an optimization processing aiming at maximizing the mutual information between the region pair feature and classifying distribution, respectively. An additional region-based feature depicting the correlation between global region grey intensity patterns was also proposed. Compared with the result of Viola-like approach using over 2 000 features, the proposed approach can achieve similar error rates with only 16 features and 1/6 implementation time on controlled illumination images. 展开更多
关键词 face detection region pair grey feature region grey pattern correlation machine learning
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Monitoring actual performance of ground source heat pump system using GPRS-based data transmission: A case analysis in Tangshan 被引量:2
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作者 杜红普 孔祥飞 +1 位作者 李敏 齐承英 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第4期1554-1562,共9页
The energy efficiency monitoring is an essential precondition for ground source heat pump system's controlling and energy saving operation. Based on the data monitoring applied in the school building, this work is... The energy efficiency monitoring is an essential precondition for ground source heat pump system's controlling and energy saving operation. Based on the data monitoring applied in the school building, this work is focused on the parameters acquisition and operation analysis of the GSHP system in Tangshan. Results show the average COPs(coefficient of performance) are2.85 and 2.70 in summer and winter, respectively, and heat(cold) unbalance underground existed after whole year operation. The analysis of data also indicates that the direct borehole air-conditioning saved some power consumption obviously in the early stage of summer and energy saving of the GSHP system depended remarkably on its operation and management level. Besides the observation points of ground temperature are laid for a large-scale GSHP system, and the hydraulic balance of the pipes group needs to be concerned specially in safeguarding better reliability. 展开更多
关键词 ground source heat pump monitoring operation performance
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Cycle life prediction of traction battery based on degradation data 被引量:1
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作者 孟祥峰 Wang Zhenpo 《High Technology Letters》 EI CAS 2010年第1期13-17,共5页
The traction battery cycle life prediction method using performance degradation data was proposed. The example battery was a commercialized lithium-ion cell with LiMn2O4/Graphite cell system. The capacity faded with c... The traction battery cycle life prediction method using performance degradation data was proposed. The example battery was a commercialized lithium-ion cell with LiMn2O4/Graphite cell system. The capacity faded with cycle number follows a traction function path. Two cycle life predicting models were established. The possible cycle life was extrapolated, which follows normal distribution well. The distribution parameters were estimated and the battery reliability was evaluated. The models' precision was validated and the effect of the cycle number on the predicting precision was analysed. The cycle life models and reliability evaluation method resolved the difficulty of battery life appraisal, such as long period and high cost. 展开更多
关键词 traction lithium-ion battery performance degradation cycle life prediction cycle life model
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Catalytic activity of recyclable resorcinarene-protected antibacterial Pd nanoparticles in C-C coupling reactions
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作者 Urvi Panchal Krunal Modi +2 位作者 Manthan Panchal Viren Mehta Vinod K.Jain 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第2期250-257,共8页
Novel tetra-methoxy resorcinarene tetra-hydrazide(TMRTH) has been synthesized and used as a reducing agent and a capping agent for the synthesis of water-dispersible stable palladium nanoparticles(PdNPs).The TMRTH... Novel tetra-methoxy resorcinarene tetra-hydrazide(TMRTH) has been synthesized and used as a reducing agent and a capping agent for the synthesis of water-dispersible stable palladium nanoparticles(PdNPs).The TMRTH-PdNPs were characterized by UV-Vis spectroscopy,transmission electron microscopy,energy-dispersive X-ray spectroscopy,and powder X-ray diffraction.The synthesized nanoparticles are polydispersible with a size of 5 ± 2 nm and were found to be recyclable over five cycles maintaining a catalytic activity in the Suzuki-Miyuara cross-coupling reaction.The nanocatalyst was superior in catalytic performance to conventional palladium catalysts with respect to reaction time,catalyst loading and recyclability.TMRTH-PdNPs show promise for their use in biological applications as they exhibit good antibacterial activity against gram-positive bacteria. 展开更多
关键词 Palladium nanoparticle RESORCINARENE Suzuki-Miyuara cross-coupling reaction NANOCATALYSIS RECYCLABILITY
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Design of Weigh Feeder Control System for Energy Saving Using Performance-Adaptive Method
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作者 Takao Sato Shohei Kitano +2 位作者 Toru Yamamoto Nozomu Araki Yasuo Konishi 《Journal of Mechanics Engineering and Automation》 2012年第1期1-8,共8页
This paper discusses a design method for the control system of a weigh feeder that supplies powder and granular material at a constant rate. Most weigh feeders employed in industry are controlled by proportional and i... This paper discusses a design method for the control system of a weigh feeder that supplies powder and granular material at a constant rate. Most weigh feeders employed in industry are controlled by proportional and integral (PI) compensation, and the control performance is decided by the selection of parameters. To attain advanced control performance by PI control, the PI parameters are designed on the basis of generalized minimum variance control (GMVC). In this study, to achieve user-specified control performance by GMVC-based PI control, the design parameters of GMVC are automatically adjusted using a performance-adaptive method. The control performance discussed in this study consists of the variance of the control error and that of the difference in the control input. In a conventional performance-adaptive method, the variance of the control error is reduced. In this study, to reduce energy consumption and to achieve user-specified control performance, the variance of the difference in the control input is specified and the design parameter is determined. To demonstrate its effectiveness, the proposed method is applied to an actual weigh feeder. 展开更多
关键词 Weigh feeder performance-adaptive PI (proportional and integral) control generalized minimum variance control energy saving.
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Review Article of Landscape Metrics Based on Remote Sensing Data 被引量:2
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作者 A.F. Petrosyan V. Karathanassi 《Journal of Environmental Science and Engineering》 2011年第11期1542-1560,共19页
This article describes metrics in order to quantify landscape structure. Landscape metrics are offered and designed to be as versatile as possible using several programs. In this paper it is attempted to (a) collect... This article describes metrics in order to quantify landscape structure. Landscape metrics are offered and designed to be as versatile as possible using several programs. In this paper it is attempted to (a) collect all the metrics found in the literature, (b) classify them, and (c) evaluate them through their use. An extensive investigation of the literature has been performed. Small discussion of each metric is provided to its concept, definition, use, way of calculation and in some cases contribution to the sustainable development. The frequency of used papers per each index has been taken into account. The most used to the least used six metrics have the following order: Area/Density/Edge; Isolation Proximity; Diversity; Contagion Interspersion; Shape; Connectivity. Moreover, the frequency of used papers is divided into five groups, i.e. group A till group E. Concluding, it has been provided an explanation of the results regarding to the four indices of group A and two indices from the group B. 展开更多
关键词 LANDSCAPE ECOLOGY STRUCTURE metrics CLASS indices
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Land Use and Property Changes in Hungary and Poland after EU Accession
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作者 Katalin Takacs-Gyorgy Tamers Erdelyi +2 位作者 Robert Magda Istvan Takacs Adam Sadowski 《Journal of Agricultural Science and Technology(A)》 2012年第6期723-734,共12页
Land property in the post socialist countries was rebuilt in the beginning of the 1990s. The process went in different way in all of the post-socialist countries. The result of the privatization of agricultural land w... Land property in the post socialist countries was rebuilt in the beginning of the 1990s. The process went in different way in all of the post-socialist countries. The result of the privatization of agricultural land was a fragmented, direct or indirect smallholder ownership structure in most of the new member states of the EU. The land, partly or totally was given back to the owners and inheritors of land reforms following the war. It means that considerable proportion of the land is cultivated by tenants, the fragmented estate structure decreases the efficiency and the increasing rental fees further destroy the profitability and competitiveness of farming. Regarding to the competitiveness of agriculture, Poland showed a developing tendency after the accession, but Hungary suffers from serious problems. Applying descriptive statistics between the changes of land use and land ownership during the research relation analysis, emphasizing the effect in competitiveness of the land price and a land rent, the paper tries to identify the main differences and similarities in land use and property structure, and their effects on the agricultural competitiveness based on the FADN data base, since 2004-2007. 展开更多
关键词 Land ownership and rental effects on tendencies EU
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Improvement of Emissions and Burning Limits in Burner Combustion using an Injector on the Concept of Fuel-Water Internally Rapid Mixing
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作者 Tomoaki Yatsufusa Yoshiyuki Kidoguchit Daisuke Nakagawa 《Journal of Energy and Power Engineering》 2014年第1期11-19,共9页
This study tried to apply biomass fuel to clean burner combustion under high load conditions by water addition. A newly developed injector mixes fuel rapidly with water inside of the injector with support of atomizing... This study tried to apply biomass fuel to clean burner combustion under high load conditions by water addition. A newly developed injector mixes fuel rapidly with water inside of the injector with support of atomizing air. The mixture composed of three-fluid is injected as spray into a flame stabilizer of burner. Investigation of emission performance of this injector shows that the internally rapid mixing type of injector is hopeful technique to introduce water into burner combustion. Combustion by this injector emits exceedingly less particulate matters at high load. NOx emission is strongly dependent on water flow rate. 展开更多
关键词 COMBUSTION low-quality fuel water addition emulsified fuel.
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LOFT L9-3 Experiment Simulation Using the SPACE Code
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作者 Chang-Keun Yang Yo-Han Kim Sang-Jun Ha 《Journal of Energy and Power Engineering》 2014年第10期1695-1702,共8页
The KHNP (Korea Hydro & Nuclear Power Co.) has developed a multipurpose nuclear safety analysis code called SPACE (the safety and performance analysis code) for nuclear power plants. SPACE code is a best-estimate... The KHNP (Korea Hydro & Nuclear Power Co.) has developed a multipurpose nuclear safety analysis code called SPACE (the safety and performance analysis code) for nuclear power plants. SPACE code is a best-estimated two-phase three-field thermal-hydraulic analysis code used to analyze the safety and performance of pressurized water reactors. In this paper, LOFT (loss of fluid test) L9-3 experiment using the SPACE code was selected to confirm the capability of SPACE code and the results calculated by the SPACE code are compared with those measured through the experiment. The results were compared with the experimental data and those of the other code simulations. Throughout the simulation result, it was concluded that the SPACE code can effectively simulate LOFT L9-3 experiment. 展开更多
关键词 SPACE code LOFT L9-3 ATWS.
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Thorium and Its Future Importance for Nuclear Energy Generation 被引量:1
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作者 Paulo E. O. Lainetti 《Journal of Energy and Power Engineering》 2016年第10期600-605,共6页
Thorium was discovered in 1828 by the Swedish chemist Jons J. Berzelius. Despite some advantages over uranium for use in nuclear reactors, its main use, in the almost two centuries since its discovery, thorium was res... Thorium was discovered in 1828 by the Swedish chemist Jons J. Berzelius. Despite some advantages over uranium for use in nuclear reactors, its main use, in the almost two centuries since its discovery, thorium was restricted to use for gas mantles, especially in the early 20th century. In the beginning of the nuclear era, many countries had interested on thorium, particularly during the 1950-1970 period. There are about 435 nuclear reactors in the world nowadays. They need more than 65,000 tons of uranium yearly. The future world energy needs will increase and, even if we assumed a conservative contribution of nuclear generation, there will be a significant increasing in the uranium prices occur, taking into account that uranium, as used in the present thermal reactors, is a finite resource. Thorium is nearly three times more abundant than uranium in the Earth's crust. Despite thorium is not a fissile material, ^232Th can be converted to ^233U (fissile) more efficiently than ^238U to ^239pu. Besides this, since it is possible to convert thorium waste into non-radioactive elements, thorium is an environment-friendly alternative energy source. Thorium fuel cycle is also inherently resistant to proliferation. Some papers evaluate the thorium resources in Brazil over 1,200,000 metric t. Then, the thorium alternative must be seriously considered in Brazil for strategic reasons. In this paper a brief history of thorium is presented, besides a review of the world thorium utilization and a discussion about advantages and restrictions of thorium use. 展开更多
关键词 NUCLEAR energy IMPORTANCE THORIUM Brazilian resources strategic importance.
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The Impact of Flexible Element Inside of Intake Canal on Kinematics of Load in Combustion Chamber
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作者 Piotr Piatkowski 《Computer Technology and Application》 2013年第10期538-542,共5页
The results of analysis of technical possibilities to increase engine efficiency were presented in this article. This problem was connected with kinematics properties of air inflow to the combustion chamber. The possi... The results of analysis of technical possibilities to increase engine efficiency were presented in this article. This problem was connected with kinematics properties of air inflow to the combustion chamber. The possibilities of intake airflow modulation have a positive impact on combustion process, level of engine usable parameters and emission. This issue was presented on the results of experimental research. Results of baseline research gave information about the flow resistance. On the basis of results of experimental research, conclusions were formulated. 展开更多
关键词 Supply system engine intake system filling of combustion chamber.
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Demonstrative Study of Vehicles Using Waste Vegetable Oil as Fuel
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作者 Yasuyuki Nemoto Izumi Ushiyama 《Journal of Energy and Power Engineering》 2015年第2期185-191,共7页
SVO (straight vegetable oil) method means the direct use of vegetable oil as car fuel through installation of a heater unit in the car to decrease vegetable oil viscosity. In this study, the authors carried out perf... SVO (straight vegetable oil) method means the direct use of vegetable oil as car fuel through installation of a heater unit in the car to decrease vegetable oil viscosity. In this study, the authors carried out performance tests on the direct use of waste cooking oil using a car with a heater unit, Moreover, the authors carried out long run driving on road tests in five years using a public car of Minami-Aizu Town in Fukushima Prefecture and analyzed the case of troubles and clarified the availability and problems of SVO vehicles. As a result, the car with a heater unit shows similar performance in both cases using vegetable oil or diesel fuel as fuel. The tested SVO vehicle of Minami-Aizu Town could be driven 38,127 km mainly by waste vegetable oil with a total driving distance of 52,293 km in long run driving tests in five years, and decreased about 3,813.5 liters of light oil which corresponds to 9.99 t of CO2. 展开更多
关键词 Waste cooking oil straight vegetable oil bio-fuel.
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任务教学法——从理论到实践的探讨 被引量:17
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作者 陈慧媛 《中国外语教育》 2008年第2期11-18,78,共9页
本文首先描述和讨论了任务教学法的渊源、原则、心理基础和理念以及对第二语言习得的机理作用等理论问题,继而又对在教学实践中如何尝试性地运用任务教学法的理念和做法,对大学不同层次的英语教学对象进行教学实验的情况作了报告。文中... 本文首先描述和讨论了任务教学法的渊源、原则、心理基础和理念以及对第二语言习得的机理作用等理论问题,继而又对在教学实践中如何尝试性地运用任务教学法的理念和做法,对大学不同层次的英语教学对象进行教学实验的情况作了报告。文中强调了这一教学法的某些教学原则和理念,特别是其"能力培养型"和"自我调节"等概念。同时,还讨论了语言学习的社会性、课堂上的交互性活动、信息处理等对第二语言习得的促进作用。最后阐明,对于一种教学法,深刻理解和解读其理念胜于对其方法的生搬硬套。 展开更多
关键词 任务教学法 使能性 自我调节
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Reweighted Nadaraya-Watson estimation of jump-diffusion models 被引量:4
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作者 HANIF Muhammad WANG HanChao LIN ZhengYan 《Science China Mathematics》 SCIE 2012年第5期1005-1016,共12页
In this paper,we study the nonparametric estimation of the second infinitesimal moment by using the reweighted Nadaraya-Watson (RNW) approach of the underlying jump diffusion model.We establish strong consistency and ... In this paper,we study the nonparametric estimation of the second infinitesimal moment by using the reweighted Nadaraya-Watson (RNW) approach of the underlying jump diffusion model.We establish strong consistency and asymptotic normality for the estimate of the second infinitesimal moment of continuous time models using the reweighted Nadaraya-Watson estimator to the true function. 展开更多
关键词 continuous time model Harris recurrence jump-diffusion model local time nonparametric estimation RNW estimator
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