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Effects of Different Cultivation Methods on Growth, Yield and Quality of Cassava 被引量:1
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作者 蒋万 吴勇 +2 位作者 江定 杨金辉 宋勇 《Agricultural Science & Technology》 CAS 2015年第10期2086-2090,共5页
The research explored effects of cultivation methods on growth, yield and quality of cassava. The results showed that the mulching treatment by direct seed- ing, the mulching treatment by transplanting, and the expose... The research explored effects of cultivation methods on growth, yield and quality of cassava. The results showed that the mulching treatment by direct seed- ing, the mulching treatment by transplanting, and the exposed treatment by trans- planting performed excellently in bringing seedling stage forward, improving germina- tion rate, yield and quality. For example, seedling emergence stages were 36, 31 and 31 d earlier; germination rates improved by 19.24%, 14.29% and 14.29%; yields grew by 41.98%, 26.72% and 11.45%; starch contents increased by 3.50%, 2.10% and 1.40%, respectively. Therefore, cassava in the mulching treatment by direct seeding is characterized by earlier seedling emergence stage, high germination rate, high yield and quality. 展开更多
关键词 CASSAVA cultivation methods Growth vigor YIELD QUALITY
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Effects of Cultivation Methods on Yield Formation and Photosynthetic Characteristics of Zhuliangyou 4024 and H You 159 as Doublecropping Rice 被引量:1
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作者 刘利成 敬礼恒 +3 位作者 李蓉 何川 洪珊 邓化冰 《Agricultural Science & Technology》 CAS 2015年第7期1381-1384,共4页
To explore the high-yield cultivation methods of Zhuliangyou 4024 and H You 159 when planted as double-cropping rice, the effects of two cultivation meth- ods, i.e., seedling broadcasting and transplanting, were studi... To explore the high-yield cultivation methods of Zhuliangyou 4024 and H You 159 when planted as double-cropping rice, the effects of two cultivation meth- ods, i.e., seedling broadcasting and transplanting, were studied on SPAD value, photosynthetic rate, grain yield and yield components. The results showed that the seedling broadcasting cultivation was conducive to Zhuliangyou 4024 and H You 159 to obtain higher yield. The higher chlorophyll content and photosynthetic rate and their slower decrease of flag leaf after full heading of the seedling broadcasting cultivation were thought to be the physiological basis of high yield. 展开更多
关键词 Double-cropping rice cultivation method YIELD Photosynthetic charac- teristic
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Fenlong Cultivation-the Fourth Set of Farming Methods Invented in China 被引量:17
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作者 韦本辉 《Agricultural Science & Technology》 CAS 2017年第11期2045-2048,2052,共5页
The basic theory and effect of the new farming method of "Fenlong" cultivation which has been included in the main extension technology of Ministry of Agriculture of the People's Republic of China is fully illustra... The basic theory and effect of the new farming method of "Fenlong" cultivation which has been included in the main extension technology of Ministry of Agriculture of the People's Republic of China is fully illustrated for the first time, and it is the fourth set (generation) of farming modes and methods following manpower, animal and mechanical (tractor) farming. It follows the natural law to achieve soil activation, water saving, oxygen increase, warming and desalination through the active use of natural resources like soil, rainfall and solar energy, thereby promoting a new round of natural agricultural production and quality improvement and water con- servation, which has crop yield increase by 10%-30%, quality improvement of 5%, natural precipitation retaining increase by100%. The characteristics and mechanism are the use of spiral drill for one-time completion of the land preparation by drilling vertically to 30-50 cm of soil layer through high speed peeling. After instant high temperature and many fierce impacts, mechanical frictions, it could achieve the multiplication of the number of loose soil, soil physical modification and expansion of the soil nutrients, reservoirs, oxygen, microorganisms ("Four pools"). Fenlong cultivation can give birth to new farming culture and civilization, and it can achieve the physical "desalinized" transformation and utilization of saline soil. The formation of Fenlong green farming technology system makes it possible to invent the farming tools of "serf-propelled Fenlong machinery" that has got the patent, and it is the method for farmland (dry land, paddy field) Fenlong cultivation, saline-alkali soil smash-ridging cultivation and for the abundance of grass ecology on degraded grassland. The application of Fenlong "4+1" (arable, saline-alkali soil, grasslands, Sponge City+rivers) green development in China can achieve the "double safety" of food and living space. 展开更多
关键词 Fenlong cultivation The fourth set (generation) of new farming methods Activation and utilization of natural resources Improvement of production and quality Water conservation ecology
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Automatic measurement of three-phase contact angles in pore throats based on digital images
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作者 ZANG Chuanzhen WANG Lida +3 位作者 ZHOU Kaihu YU Fuwei JIANG Hanqiao LI Junjian 《Petroleum Exploration and Development》 SCIE 2023年第2期442-449,共8页
With the help of digital image processing technology, an automatic measurement method for the three-phase contact angles in the pore throats of the microfluidic model was established using the microfluidic water flood... With the help of digital image processing technology, an automatic measurement method for the three-phase contact angles in the pore throats of the microfluidic model was established using the microfluidic water flooding experiment videos as the data source. The results of the new method were verified through comparing with the manual measurement data.On this basis, the dynamic changes of the three-phase contact angles under flow conditions were clarified by the contact angles probability density curve and mean value change curve. The results show that, for water-wetting rocks, the mean value of the contact angles is acute angle during the early stage of the water flooding process, and it increases with the displacement time and becomes obtuse angle in the middle-late stage of displacement as the dominant force of oil phase gradually changes from viscous force to capillary force. The droplet flow in the remaining oil occurs in the central part of the pore throats, without three-phase contact angle. The contact angles for the porous flow and the columnar flow change slightly during the displacement and present as obtuse angles in view of mean values, which makes the remaining oil poorly movable and thus hard to be recovered. The mean value of the contact angle for the cluster flow tends to increase in the flooding process, which makes the remaining oil more difficult to be recovered. The contact angles for the membrane flow are mainly obtuse angles and reach the highest mean value in the late stage of displacement, which makes the remaining oil most difficult to be recovered. After displacement, the remaining oils under different flow regimes are just subjected to capillary force, with obtuse contact angles, and the wettability of the pore throat walls in the microfluidic model tends to be oil-wet under the action of crude oil. 展开更多
关键词 microfluidic model water flooding experiment digital image processing three-phase contact angle measure-ment method flow regime of the remaining oil
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Effects of Cultivation Method on Seed Yield and Quality of Bitter Gourd 被引量:1
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作者 Tianzhu ZHANG Caixia LIU +1 位作者 Zhiqiang MI Xueyuan ZHANG 《Asian Agricultural Research》 2020年第1期53-57,61,共6页
This experiment was carried out to study the possibility of producing germinating seeds of bitter gourd(Momordica charamtia L.)in the climatic conditions of Europe.Seeds of Indian cultivar‘Nana’were sown in the gree... This experiment was carried out to study the possibility of producing germinating seeds of bitter gourd(Momordica charamtia L.)in the climatic conditions of Europe.Seeds of Indian cultivar‘Nana’were sown in the greenhouse and produced transplants were planted on the field.The plants were cultivated in the field in 2 ways:tied to the sticks or creeping on the ground.During the vegetation,the ripen fruits with seeds were collected 6 times,and after extracting,they were germinated in the laboratory following the routine ISTA rules.The best transplants of bitter gourd were received within one month from the seeds emerging 51.8%.The transplant of bitter gourd had average height of7 cm,3-4 leaves,out of which the biggest had the width of 5 cm.Such transplants would grow into fruiting plants.When growing bitter gourd for seeds,the earliest fruits were harvested from the plants tied to the sticks.Moreover,the best seeds were harvested from 2/3 of early fruits.For the purpose of seed production,it is recommended to keep only 3-4 fruits per plant and remove other fruits.The produced seeds germinated from 8%to 24%.If the plants were tied to the sticks,their fruits ripened earlier.The used production way and time of harvest of fruits had no effect on the seed germination.The cultivation methods of bitter gourd plants had no effect on the chemical components of fruits. 展开更多
关键词 BITTER gourd SEEDS EUROPE cultivation method
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Assessment of Cultivation Method for Energy Beet Based on LCA Method
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作者 Chunfeng ZHANG Feng LIU +3 位作者 Yuangang ZU Qingying MENG Baoguo ZHU Nannan WANG 《Asian Agricultural Research》 2014年第2期49-55,59,共8页
In order to establish a supply system for energy resource coupled with the environment,the production technology of sugar beets was explored as a biological energy source. The low-humic andosol as the experimental soi... In order to establish a supply system for energy resource coupled with the environment,the production technology of sugar beets was explored as a biological energy source. The low-humic andosol as the experimental soil,the panting method was direct planting,and cultivation technique was minimum tillage direct planting method. The control was conventional tillage transplant and no tillage direct planting. The results demonstrated that data revealed that the energy cost of no tillage and a direct planting method was 105 GJ/hm2on average for two years,while that of the conventional tillage method was 112 GJ/hm2per year. The ratio of output to input showed that the direct planting with no tillage was more efficient( 3. 61) than the conventional tillage( 3. 01). Moreover,the emission of CO2into the atmosphere with no tillage and the direct planting was 71% of the conventional tillage planting technique. Therefore,direct planting without tillage reduces the impact on the environment. 展开更多
关键词 BEET cultivation methods LCA(Life CYCLE ASSESSMENT
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Effective electroelastic constants for three-phase confocal elliptical cylinder model in piezoelectric quasicrystal composites 被引量:5
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作者 Yongbin WANG Junhong GUO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2018年第6期797-812,共16页
A three-phase confocal elliptical cylinder model is proposed to analyze micromechanics of one-dimensional hexagonal piezoelectric quasicrystal (PQC) compos- ites. Exact solutions of the phonon, phason, and electric ... A three-phase confocal elliptical cylinder model is proposed to analyze micromechanics of one-dimensional hexagonal piezoelectric quasicrystal (PQC) compos- ites. Exact solutions of the phonon, phason, and electric fields are obtained by using the conformal mapping combined with the Laurent expansion technique when the model is subject to far-field anti-plane mechanical and in-plane electric loadings. The effective elec- troelastic constants of several different composites made up of PQC, quasicrystal (QC), and piezoelectric (PE) materials are predicted by the generalized self-consistent method. Numerical examples are conducted to show the effects of the volume fraction and the cross-sectional shape of inclusion (or fiber) on the effective electroelastic constants of these composites. Compared with other micromechanical methods, the generalized self- consistent and Mori-Tanaka methods can predict the effective electroelastic constants of the composites consistently. 展开更多
关键词 piezoelectric quasicrystal (PQC) three-phase elliptical cylinder model effective constant generalized self-consistent method
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Effect of Cultivation Pattern on the Light Radiation of Group Canopy and Yield of Spring Soybean (Glycine Max L. Merrill) 被引量:3
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作者 Jialei Xiao uijiang Wang +7 位作者 Ming Zhao Jing Yin Wei Li Yingdong Bi Wan Li Yongcai Lai Xiatian Shu Yang Zhao 《American Journal of Plant Sciences》 2013年第6期1204-1211,共8页
Heilongjiang Province is the main soybean-producing area in china. In this study, we analyzed the canopy structure, dynamic characteristics of light radiation and yield of Hefeng50 (the main variety of soybean in Heil... Heilongjiang Province is the main soybean-producing area in china. In this study, we analyzed the canopy structure, dynamic characteristics of light radiation and yield of Hefeng50 (the main variety of soybean in Heilongjiang Province) under six different cultivation patterns (ORP, TPCR, ORCP, BRHD, SRHD and FPHD). The results showed that SRHD and BRHD at different growth period (blossom period R1, podding R3 and grain filing period R5) produced an even distribution of the population leaf area, suitable mean foliage inclination angle (MFIA), low transparency coefficients for defuse penetration (TCDP) and transparency coefficients for radiation penetration (TCRP), high leaf area index (LAI), extinction light coefficient (K value), fraction of radiation intercepted (FRI) and light energy utilization rate. Grain number, dry matter weight per plant, and yield of SRHD and BRHD were significantly higher than those of other cultivation patterns. The yield of SRHD, BRHD, ORCP, FPHD and TPCR was increased by 136%, 112%, 79%, 50.1% and 14.7%, respectively, compared to that of ORP. These results suggest that SRHD and BRHD are the optimal cultivation pattern for the improvement of soybean yield in phaeozem region of northeastern China. 展开更多
关键词 cultivation methods LIGHT ENRICHMENT SOYBEAN CANOPY YIELD Components Population CANOPY
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Testing for Nonlinearity in Dynamic Characteristics of Vertical Upward Oil-Gas-Water Three-phase Bubble and Slug Flows 被引量:1
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作者 朱雷 金宁德 +2 位作者 高忠科 杜萌 王振亚 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第5期870-882,共13页
Based on the conductance fluctuation signals measured from vertical upward oil-gas-water three-phase flow experiment, time frequency representation and surrogate data method were used to investigate dynamical characte... Based on the conductance fluctuation signals measured from vertical upward oil-gas-water three-phase flow experiment, time frequency representation and surrogate data method were used to investigate dynamical characteristics of oil-in-water type bubble and slug flows. The results indicate that oil-in-water type bubble flow will turn to deterministic motion with the increase of oil phase fraction f o and superficial gas velocity U sg under fixed flowrate of oil-water mixture Q mix . The dynamics of oil-in-water type slug flow becomes more complex with the increase of U sg under fixed flowrate of oil-water mixture. The change of f o leads to irregular influence on the dynamics of slug flow. These interesting findings suggest that the surrogate data method can be a faithful tool for characterizing dynamic characteristics of oil-in-water type bubble and slug flows. 展开更多
关键词 oil-gas-water three-phase flow conductaJace fluctuating signals time-frequency representation surrogate data method
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Regional Differences and Optimal Allocation of Cultivated Land Utilization Benefits Based on Improved TOPSIS Method:A Case Study of Guangxi
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作者 Chuchu SUN Ning GENG Mengyao WANG 《Asian Agricultural Research》 2021年第7期24-31,共8页
Taking 14 prefecture-level cities in Guangxi as an object,this paper explored the difference of cultivated land utilization efficiency in Guangxi,comprehensively evaluated the economic,social,and ecological aspects,an... Taking 14 prefecture-level cities in Guangxi as an object,this paper explored the difference of cultivated land utilization efficiency in Guangxi,comprehensively evaluated the economic,social,and ecological aspects,and analyzed the regional differences in cultivated land use efficiency in Guangxi from 2005 to 2018 based on the improved TOPSIS method.By studying the quantitative change trends and spatial differences of the utilization benefit of cultivated land resources in Guangxi,it came up with recommendations for optimizing the allocation of cultivated land from the quantity and quality of cultivated land.It is intended to provide a scientific and theoretical reference for improving the use efficiency of cultivated land in Guangxi. 展开更多
关键词 Efficiency of cultivated land use Improved TOPSIS method Regional difference Optimal allocation GUANGXI
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The Cultivation of English Reading Ability in Secondary School
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作者 李晨希 《商情》 2011年第47期108-108,共1页
关键词 英语学习 学习方法 英语翻译 阅读知识
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Three-Phase Optimal Power Flow for Study of PV Plant Distributed Impact on Distribution Systems
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作者 Malinwo E. Ayikpa Katia C. de Almeida Guilherme C. Danielski 《Journal of Electrical Engineering》 2017年第1期47-56,共10页
This paper presents a TOPF (three-phase optimal power flow) model that represents photovoltaic systems. The PV plant is modeled in the TOPF as active and reactive power source. Reactive power can be generated or abs... This paper presents a TOPF (three-phase optimal power flow) model that represents photovoltaic systems. The PV plant is modeled in the TOPF as active and reactive power source. Reactive power can be generated or absorbed using the available capacity and the adjustable power factor of the inverter. The reduction of unbalance voltage and losses in the distribution systems is obtained by actions of reactive power control of the inverter. The TOPF is formulated by current balance equations and the PV systems are modeled via an equivalent circuit. The primal-dual interior point method is used to obtain the optimal operating points for the systems for different scenarios of solar irradiance and temperature, thus providing a detailed view of the impact of photovoltaic distributed generation. 展开更多
关键词 three-phase optimal power flow photovoltaic generation unbalance voltage LOSS primal-dual interior point method.
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Prediction of Core Losses of Three-Phase Distribution Transformer
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作者 Mihail Digalovski Krste Najdenkoski Goran Rafajlovski 《Journal of Energy and Power Engineering》 2013年第12期2347-2353,共7页
Transformers are normally designed and built for use at rated frequency and sinusoidal load current. A non-linear load on a transformer leads to harmonic power losses which cause increased operational costs and additi... Transformers are normally designed and built for use at rated frequency and sinusoidal load current. A non-linear load on a transformer leads to harmonic power losses which cause increased operational costs and additional heating in transformer parts. It leads to higher losses, early fatigue of insulation, premature failure and reduction of the useful life of the transformer. To prevent these problems, the rated capacity of transformer which supplies harmonic loads must be reduced. In this work, a typical 50 kVA three-phase distribution transformer with real practical parameters is taken under non-linear loads generated due to domestic loads. The core losses is evaluated using the three dimensional model of the transformer developed in FEM (finite element method) program based on valid model of transformer under high harmonic conditions. And finally a relation associated with core losses and amplitude of high harmonic order are reviewed & analyzed and then a comparison is being carried out on the results obtained by different excitation current in transformer windings. 展开更多
关键词 Core losses three-phase transformer HARMONIC 3D model finite element method magnetic flux distribution.
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食用菌栽培发展历程 被引量:1
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作者 谭琦 《食用菌学报》 CSCD 北大核心 2024年第5期1-8,共8页
回顾食用菌从野生、人工干预到人工栽培的发展历程,介绍食用菌栽培方式和栽培模式,总结中国为世界食用菌产业发展作出的贡献,展望食用菌栽培发展的方向。
关键词 栽培历史 栽培方式 栽培模式
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面向国家一流专业的国际贸易实务课程思政建设研究 被引量:1
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作者 赵桂梅 赵桂芹 《高教学刊》 2024年第4期30-33,共4页
立足于国家一流专业建设目标,专业课程内容中融入思政教育并进行设计和实施教学,对于培养具有人文素养和科学精神的国际化人才具有重要意义。该文阐述国家一流本科人才德育素养的培养需求,基于课程思政教育理论,提出高校课程思政教育的... 立足于国家一流专业建设目标,专业课程内容中融入思政教育并进行设计和实施教学,对于培养具有人文素养和科学精神的国际化人才具有重要意义。该文阐述国家一流本科人才德育素养的培养需求,基于课程思政教育理论,提出高校课程思政教育的思考,并设计国际贸易实务课程思政教育改革方案,分析高等教育课程思政教育的启示。通过课程思政教学效果的创新性、可行性、示范性进行综合评估,优化国际贸易实务课程思政教育改革路径,进一步提出对策建议。研究表明,通过提高教师课程思政的教学水平,充分挖掘课程蕴含的思政元素,进而改革课程思政的教学方法,提升学生的德育素养,能够激发学生的创造力和挑战意志,有助于培养具有工匠精神的优秀人才。 展开更多
关键词 高等教育 一流专业 课程思政 人才培养 教学方法
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数学拟合法应用于旋耕机结构设计研究 被引量:1
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作者 杨旭 《农机化研究》 北大核心 2024年第9期240-243,248,共5页
针对旋耕机在作业时存在耕深不够、碎土效果差及土地平整效果差等问题,将数学拟合法应用于旋耕机,对其结构设计进行研究。为了提升旋耕机的作业效果,对旋耕机的结构参数进行优化设计,包括对旋耕机的参数进行分析,并建立旋耕装置的数学... 针对旋耕机在作业时存在耕深不够、碎土效果差及土地平整效果差等问题,将数学拟合法应用于旋耕机,对其结构设计进行研究。为了提升旋耕机的作业效果,对旋耕机的结构参数进行优化设计,包括对旋耕机的参数进行分析,并建立旋耕装置的数学模型。为了验证旋耕机的性能,对其进行了旋耕性能试验和旋耕后农田碎土率测定试验。试验结果表明:旋耕机的耕深、地表平整度和碎土率均达到合格指标,作业效果良好。 展开更多
关键词 数学拟合法 旋耕机结构 耕深 地表平整度 碎土率
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我国自动化专业研究生理论课程教学研究
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作者 张亚军 卢绍文 《控制工程》 CSCD 北大核心 2024年第9期1699-1703,共5页
针对我国自动化专业研究生课程的教学现状,从课程内容、授课方法、模式、实验系统、考核方法以及学生创新思维的培养模式等方面揭示自动化专业研究生理论课程教学存在的问题。并对关键问题给出建议,力争在下一阶段实现以建模、控制、优... 针对我国自动化专业研究生课程的教学现状,从课程内容、授课方法、模式、实验系统、考核方法以及学生创新思维的培养模式等方面揭示自动化专业研究生理论课程教学存在的问题。并对关键问题给出建议,力争在下一阶段实现以建模、控制、优化为主线,以自动化与智能化系统设计为核心,同时融入人工智能、工业互联网、云计算等新技术为主体的课程设置,推陈出新,创新教育教学方法,切实提高我国自动化专业研究生理论课程教学水平。 展开更多
关键词 自动化 理论课程教学 教学方法 考核方式 培养模式
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“双高”背景下智造技术专业“工匠型”人才培养路径和实施方法探究
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作者 王强 钱袁萍 朱红萍 《沙洲职业工学院学报》 2024年第2期19-22,共4页
中国制造要发展成中国“智造”,离不开大批优秀的工匠,离不开优秀的技工人才。职业教育担负着技术技能人才培养高地的重任,由此对职业院校的人才培养提出了新的要求。文章阐述了在“双高”背景下智造技术专业“工匠型”人才培养的意义... 中国制造要发展成中国“智造”,离不开大批优秀的工匠,离不开优秀的技工人才。职业教育担负着技术技能人才培养高地的重任,由此对职业院校的人才培养提出了新的要求。文章阐述了在“双高”背景下智造技术专业“工匠型”人才培养的意义、培养路径和实施方法。提出打造“工匠型”双师队伍、落实“工匠型”人培方案、营造“工匠型”育人环境等途径加以培养;从人才培养方案的制定、育人平台的打造、课程体系的重构、人才评价体系的完善等方面加以实施。 展开更多
关键词 职业教育 “工匠型”人才 培养路径 实施方法
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产教融合培养应用型口腔医学人才的对策
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作者 吕继忠 张婵 蒋江涛 《中国当代医药》 CAS 2024年第23期147-150,共4页
本文旨在分析产教融合培养应用型口腔医学人才的重要性与对策。通过构建校企协同育人平台、整合临床资源进行教学改革,完善奖学金等奖励机制,培养全面性口腔医学人才,多方合作建立医学生教学资源系统,产教融合毕业实习,校企共同实施创... 本文旨在分析产教融合培养应用型口腔医学人才的重要性与对策。通过构建校企协同育人平台、整合临床资源进行教学改革,完善奖学金等奖励机制,培养全面性口腔医学人才,多方合作建立医学生教学资源系统,产教融合毕业实习,校企共同实施创业教育,组建创业指导团队、校企合作构建质量保证机制等,培养应用型口腔医学人才,可以培养适应社会需求、适应高等教育改革新形势、满足口腔医学行业的现实需要。产教融合培养应用型口腔医学人才,有利于更好地促进口腔医学人才的培养,可以组合提高医学生在毕业实习中的工作效率,使医学生的实践活动与临床实践活动实现无缝衔接,从而提高医学生的实践积极性。 展开更多
关键词 口腔科 医学人才培养 产教融合培养 教学方法
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基于CDIO-OBE理念的完井工程课程教学方法改革探究
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作者 毕刚 李蒙蒙 +3 位作者 刘志坤 窦亮彬 王瑞 韩强 《高教学刊》 2024年第16期142-145,共4页
完井工程是石油工程本科专业的主干课程之一,针对传统教学方式在石油人才培养中的现状及教学中存在的问题,提出基于CDIO-OBE理念的完井工程课程教学设计与实践,以提高学生自主学习、创新实践和团队合作的能力。该文通过对课前-课堂-课... 完井工程是石油工程本科专业的主干课程之一,针对传统教学方式在石油人才培养中的现状及教学中存在的问题,提出基于CDIO-OBE理念的完井工程课程教学设计与实践,以提高学生自主学习、创新实践和团队合作的能力。该文通过对课前-课堂-课后三个教学活动阶段的方案设计,从理论教学、实践教学、考评模式等方面对完井工程课程教学模式进行创新,初步形成“课前线上预习、课堂理论学习、课后拓展实践和以赛促教”的教学模式。在CDIO-OBE特定理念背景下的教育过程,帮助学生树立职业道德、团队精神和分享意识,为应用型人才培养模式创新提供参考和启示。 展开更多
关键词 CDIO-OBE理念 完井工程 教学方法 教学改革 石油工程人才培养
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