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  • 论毛泽东对“中国梦”的思考与探索

    毛泽东为实现“中国梦”做出了一系列基础性和开创性的历史贡献。在理论上初步勾勒了“中国梦”的轮廓,规划了“中国梦”的战略部署与具体路径。在实践上,毛泽东成长和发展的各个时期为中国梦作出不同程度的探索,分为“少年寻梦”“青年筑梦”“中年追梦”“晚年圆梦”四个阶段,为继任的党和国家领导人继续实现“中国梦”奠定了坚实的基础。...

    2022-04-01 11:22:52浏览:11 中华民族伟大复兴毛泽东nationtheoryChineseofrejuvenationDreamGreatpracticeZedongMaoandChina理论与实践中国梦

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  • A Brief Analysis of Bilingual Education in China

    This paper explores bilingual education theoretically,and analyzes the causes,development and effect of bilingual education in China.What is more,some solutions are suggested to solve some possible problem....

    2020-12-06 21:11:24浏览:22 bilingualeducationeducationaleffectChina

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  • Revitalizing Old Industrial Base of Northeast China: Process,Policy and Challenge

    Northeast China is the largest old industrial base of China that endured persistent influence of the past planned economy system.This region has lost its leading place since the reform and opening up,and became a backward region by contrast with the coastal areas.This paper elaborates the evolutionary process of the old industrial base of Northeast China,analyses the main reasons for the decline,gives a preliminary evaluation on the revitalizing polices in recent years,and points out major long-term challenges for future revitalization.It concludes that for Northeast China,a relative declining area:1) it is indispensable to get the long-term policy support from the central government;2) system reform and structure adjustment are the crucial strategies,particularly the reform of the large and medium state-owned enterprises;and developing new industries is as important as upgrading traditional advantaged industries;3) the local governments should play an indirect role,avoiding from any unnecessary intervention on economic activity;and 4) social security and investment climate must be improved simultaneously.In addition,the author stresses that the lack of knowledge on the nature of old industrial base had led to failures of the past initiatives,and revitalizing the old industrial base should be treated as a holistic regional project including economy growth,society progress and environment improvement....

    2020-11-11 22:33:38浏览:28 oldindustrialbaseregionalrevitalizationpolicyNortheastChina

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  • The Genetic Mechanism and Model of Deep-Basin Gas Accumulation and Methods for Predicting the Favora

    As a kind of abnormal natural gas formed with special mechanism, the deep-basin gas, accumulated in thelower parts of a basin or syncline and trapped by a tight reservoir, has such characteristics as gas-water inversion, abnormalpressure, continuous distribution and tremendous reserves. Being a geological product of the evolution of petroliferousbasins by the end of the middle-late stages, the formation of a deep-basin gas accumulation must meet four conditions, i.e.,continuous and sufficient gas supply, tight reservoirs in continuous distribution, good sealing caps and stable structures.The areas, where the expansion force of natural gas is smaller than the sum of the capillary force and the hydrostaticpressure within tight reservoirs, are favorable for forming deep-basin gas pools. The range delineated by the above twoforces corresponds to that of the deep-basin gas trap. Within the scope of the deep-basin gas trap, the balance relationshipbetween the amounts of ingoing and overflowing gases determines the gas-bearing area of the deep-basin gas pool. The gasvolume in regions with high porosity and high permeability is worth exploring under current technical conditions and it isequivalent to the practical resources (about 10%-20% of the deep-basin gas). Based on studies of deep-basin gasformation conditions, the theory of force balance and the equation of material balance, the favorable areas and gas-containing ranges, as well as possible gas-rich regions are preliminarily predicted in the deep-basin gas pools in the UpperPaleozoic He-8 segment of the Ordos basin....

    2020-09-15 12:28:59浏览:26 deep-basingasgeologyofnaturalgeneticmechanismOrdosBasinChina

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  • A Preliminary Study of the Gas Hydrate Stability Zone in the South China Sea

    Based on the analysis of sea-bottom temperature and geothermal gradient, and by means of the phaseboundary curve of gas hydrate and the sea-bottom temperature versus water depth curve in the South China Sea, thispaper studies the temperature and pressure conditions for gas hydrate to keep stable. In a marine environment, methanehydrate keeps stable at water depths greater than 550 m in the South China Sea. Further, the thickness of the gas hydratestability zone in the South China Sea was calculated by using the phase boundary curve and temperature-depth equations.The result shows that gas hydrate have a better perspective in the southeast of the Dongsha Islands, the northeast of theXisha Islands and the north of the Nansha Islands for thicker stability zones....

    2020-09-15 12:28:59浏览:25 SouthChinaseagashydrateStabilityzoneGeothermalgradientsea-bottom

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  • Source-Contacting Gas:Accumulation Mechanism and Distribution in China

    Source-contacting gas, which is also called basin-center gas, deep basin gas, is the tight-sand gas accumulation contacting closely to its source rocks. Having different accumulation mechanisms from conventional gas reservoirs that are formed by replacement way, the typical source-contacting gas reservoirs are formed by piston-typed migration forward way. Source-contacting gas accumulations exhibit a series of distinctly mechanic characteristics. According to the valid combination of these characteristics, the estimation for the type of discovered gas reservoirs or distributions of source-contacting gas reservoirs can be forecasted. The source-contacting gas is special for having no edge water or bottom water for gas and complicated gas-water relationships, which emphasizes the intimate association of reservoir rocks with source rocks, which is called the root of the gas reservoir. There are many basins having the mechanic conditions for source-contacting gas accumulations in China, which can be divided into three regions. Most of the basins with favorable accumulation conditions are located mainly in the central and western China. According to the present data, basins having source-contacting gas accumulations in China can be divided into three types, accumulation conditions and configuration relationships are the best in type A basins and they are the larger basins in central China. Type B basins with plain accumulation conditions exist primarily in eastern China and also the basins in western China. Accumulation conditions and exploration futures are worse in type C basins, which refer mainly to the small basins in southern China and China Sea basins. Main source-contacting gas basins in China are thoroughly discussed in this paper and the distribution patterns of source-contacting gas in five huge basins are discussed and forecasted....

    2020-09-13 23:35:02浏览:45 source-contactinggasaccumulationmechanismbasinsinChinadistribution

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  • Division of Gas Accumulation System and Laws Controlling Distribution of Natural Gas in Typical Petr

    Considering the existing problems of the petroleum system, this paper brings forward the concept of natural gas accumulation system and presents the dividing principles. Then detailed statistics on the accumulation factors of the 32 typical natural gas accumulation systems in China and studies on the laws controlling distribution of gas are collected. The research shows that the petroleum accumulation system is the basic unit controlling petroleum generation, migration and accumulation. Generating intensity, generating amount, accumulating efficiency and migration distance plays an important role in the distribution of natural gas. Through analysis on results of resources evaluation, discovered reserves and residual reserves, potential areas in middle-scaled petroliferous basins in China are forecasted in this paper. Ordos, Sichuan, Tarim and Qaidam basins are found out to be the main basins developing and enriching gas accumulation systems....

    2020-09-13 23:35:02浏览:30 petroliferousbasinsinChinagasaccumulationsystemPetroleumlaws

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  • Potential recoverable natural gas resources in China

    Natural gas resources in China are abundant. The undiscovered recoverable natural gas resources in China are estimated to be 19.27×1012 m3. Natural gas is mainly distributed in the middle and west China and offshore areas of China. The Tarim Basin, Sichuan Basin, Ordos Basin, East China Sea Basin, Tsaidam Basin, Yinggehai Basin, and Qiongdongnan Basin are the main gas-beating basins. The natural gas resources are not distributed evenly and are under-explored in China. The deeper horizons in east China, foreland basins and craton paleo-uplifts in the middle and west China, and the offshore basins are the main exploration areas in the future....

    2020-09-13 23:35:02浏览:29 naturalgasresourcesexplorationareaChina

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  • CONSTRAINING FACTORS TO SUSTAINABLE UTILIZATION OF WATER RESOURCES AND THEIR COUNTERMEASURES IN CHIN

    This paper discusses the constraining factors to sustainable utilization of water resources in China, and the countermeasures to realize sustainable water utilization. The result of comprehensive analysis shows that constraining factors to sustainable utilization of water resources in China are complicated, including physical geographical factors and socio-economic factors, such as uneven distribution of water resources at temporal and spatial scales,inappropriate institutional arrangement and non-water-saving and non-water-conservation production and life mode.The countermeasures against constraining factors to water resources sustainable development are put forward as follows: 1) using wetlands and forests, and through spatial conversion to realize temporally sustainable supply of water resources; 2) transferring water between basins and areas and developing various water resources in water shortage area; 3) establishing water-saving society; 4) strengthening water pollution control and water resources protection;and 5) establishing unified water resources management mechanism....

    2020-07-08 21:52:19浏览:28 waterresourcesSustainableutilizationChina

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  • A reduced thermodynamic model on the formation of the Nansha warm water

    A reduced vertically integrated upper mixed layer model is set up to numerically study the thermodynamic process of the formation of the "Nansha warm water"(NWW) in the Nansha Islands sea areas in spring. According to the numerical experiments, it is shown that, in spring, the formation of the NWW is mainly due to the sea surface net heat flux and the local weak current strength; the contribution from temperature advection transport and warm water exchange with the outer seas (Sulu Sea or south of Sunda shelf) is very little. In the sea areas where the current is strong, the advection may also play an important role in the temperature field....

    2020-07-08 21:52:19浏览:31 numericalmodelingwarmwaterthermodynamicprocessNanshaislandsSouthChina

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  • Benefits of Conservation Agriculture on Soil and Water Conservation and Its Progress in China

    Conservation agriculture has been practised for three decades and has been spread widely. There are many nomenclatures surrounding conservation agriculture and differ to each other lightly. Conservation agriculture (CA) is a system approach to soil and water conservation, high crop productivity and profitability, in one word, it is a system approach to sustainable agriculture. Yet, because conservation agriculture is a knowledge-intensive and a complex system to learn and implement,and also because of traditions of intensive cultivation, adoption rates have been low, since to date, only about seven percent of the world's arable and permanent cropland area is farmed under conservation agriculture. The practice and wider extention of conservation agriculture thus requires a deeper understanding of its ecological underpinnings in order to manage its various elements for sustainable intensification, where the aim is to conserve soil and water and improve sustainability over the long term. This paper described terms related to conservation agriculture, presented the effects of conservation agriculture on soil and water conservation, crop productivity, progress and adoption of CA worldwide, emphasized obstacles and possible ways to increase CA adoption to accelerate sustainable development of China agriculture....

    2020-07-08 08:49:41浏览:18 Chinaconservationtillagecropresiduemulchno-tillsoilandwater

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  • Integrated water resources management for sustainable development of in western rural China

    Management in water resources development of Jinghe watershed of western rural China is examined with Participatory Rural Appraisal method--a rare applied method in China and questionnaire survey of stakeholders.Combination of these two survey methods derives good results as it could avoid personal bias in identifying and ranking the issues on a concrete basis in following up households'survey.Statistic Package for Social Sciences(SPSS)was used for data analysis.Results indicate that since the early 1980s.issues of water scarcity,river pollution,soil erosion,insufficient participation of stakeholders in water resources use and management,as well as centrahzed water planning and management system have created difficulties for sustainable development of the watershed.The stakeholders and local governments are fully aware of the challenges and are committed to achieving a solution through integrated water resource management(IWRD).The concept and the application of IWRD for rural China are reviewed and analyzed,and a framework for implementation of IWRD in China is developed.It is conchided that the keys to successful implementation of the approach will depend on optimal arrangement of institutions,policy reforms,community involvement and capacity building in water sector,which need to fully integrate various management functions within the watershed....

    2020-07-08 08:49:41浏览:28 waterresourcesPRAQuestionnairesurveymanagementRuralChina

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  • Characteristics of Underground Water Flow at Different Water Levels in Tianshengan Karst Area, Yunna

    Three tracing tests from the same injection point executed at low, medium, and high water levels in the karst aquifer near Tianshengan village, Lunan Stone Forest, Yunnan Province, China, have revealed the basic properties of underground water flow. They showed the general directions of water flows; tracer concentrations were observed at six successive points allowing for the calculation of apparent dominant flow velocities at these sections towards the Dalongtan karst spring. For the high water level, the discharge between single sections was between two and 10 times greater than that at low water level. For the medium water level, the flow velocity at different sections was between 1.4 and 3.7 times faster than that at low water level; and for high water level, it was between 1.3 and 2.7 times faster than that at medium water level. The fastest water flow appeared at the first section (23 cm/s at medium water level); and the slowest (0.6 cm/s at low water level) appeared where water flow must cross the Tianshengan fault (north-south direction), and later, a layer of 20-30 m thickness of quartz sandstone and shale clay-stones. It was also possible to calculate the recovery of the tracer for point 4, Dakenyan, where discharge was measured. At the medium water level, 50% of the injected tracer was detected a half-day after its first appearance and at low water level after more than 3 days. The previously published research illustrates the transport velocities of possible contaminants and their solubilities in water at different hydrological conditions....

    2020-07-08 08:49:41浏览:18 karsttracingtestundergroundwaterflowLunanYunnanChina

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  • Israeli Water Achievements Today and Enlightenment to China

    Despite the endemic drought, arid climate and associated limited freshwater resources, as well as difficult geopolitical realities, Israel can provide a reliable supply of high quality water to a rapidly growing population. The achievements of water supply in Israel can be summarized as water technologies (like water transportation and purification, desalination, wastewater treatment, effluent reuse, storm water catchment, control systems, rain enhancement and drip irrigation, etc.), water management and legislation as well as water industry. In view of the national concern regarding the quality and quantity of the water, the skills, technologies and know-how that Israel has accumulated in water supply and irrigation can give us enlightenment that is also presented in this paper....

    2020-07-08 08:49:41浏览:19 IsraelChinawatertechnologymanagementindustry

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  • Invasion and control of water hyacinth (Eichhornia crassipes) in China

    By the time of primary 21st century, water hyacinth had become a serious environmental problem in China. Water hyacinth contributes to the major part of ecological hazards from the invasion of foreign plant species, which is estimated about USD 7 billion a year in values.In the past 10 years, herbicides glyphosate, 2,4-D and paraquat have been used in controlling water hyacinth in China. Although the herbicides provided effective control on the weed in some areas, they could not provide the sustainable inhibition on the weed population, while would lead to pollution on water at various levels. At present, the herbicide application on water hyacinth is forbidden in many areas of China such as Shanghai. In this situation, the asexual reproduction inhibitor, KWH02, was invented for controlling water hyacinth and it provided about 70% of growth inhibition without any risk of dead plant pollution.It has been about 10 years for bio-control of water hyacinth in China. Works focused on mainly the efficacy and safety of the utilization of foreign insects. Researches on microorganism herbicides to control water hyacinth were started and obtained primary achievements in recent years.Although there are different opinions on how to face the water hyacinth problem in China, it is accepted widely that the control methods should be high efficient and safe with low cost. Some practical measures for integrated management of water hyacinth are suggested....

    2020-07-08 08:49:41浏览:13 invasioncontrolwaterhyacinthChina

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  • PRESSURE OF WATER SHORTAGE ON AGRICULTURE IN ARID REGION OF CHINA

    The arid areas in China are mainly located in North China and Northwest China. The North China is themain region for food production. There is 31.19% of the total farmland and 26. 01% of the total population, but only6. 14% of the available water resources of China. Groundwater is over pumped (6. 53 × 109m3 every year) in the regionsof Beijing, Tianjin, and Hebei Province, so water supply could not meet the water demand there. The distribution of wa-ter in Northwest China is uneven, some inland rivers and lakes are dried up, and desertification has expanded since riverwater in the upper and middle reaches is diverted for irrigation. Up to 2050, population will be up to 1.6 × 109 in Chi-na, and industry will be developed fast, therefore 50% of the water supply will be used by industry and resident, andwater for agriculture will be decreased year by year. In the coming 50 years, water demand for agriculture will be in-creased by 5.6 × 109m3 in the Huanghe (Yellow) River valley, and by 1.7 × 109m3 in the Northwest China. It will beimpossible for the Huanghe River to meet the water demand, because it always dried up in the cold half year since 1984.To avoid water shortage of agriculture in the arid regions, it is necessary to divert water from the Changjiang (Yangtze)River in the south of China, and to use water efficiently. It is the best way to use drip irrigation in agriculture, recyclewater in industry and resident use, and control water pollution. Otherwise water shortage in the arid regions will restrictthe development of agriculture in China....

    2020-07-08 08:49:41浏览:34 watershortagedemandagriculturearidregionofChina

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  • Study on interaction between the coastal water,shelf water and Kuroshio water in the Huanghai Sea an

    The main processes of interaction between the coastal water, shelf water and Kuroshiowater in the Huanghai Sea (HS) and East China Sea (ECS) are analyzed based on the observation andstudy results in recent years. These processes include the intrusion of the Kuroshio water into the shelfarea of the ECS, the entrainment of the shelf water into the Kuroshio, the seasonal process in the south-em shelf area of the ECS controlled alternatively by the Taiwan Strait water and the Kuroshio water in-truding into the shelf area, the interaction between the Kuroshio branch water, shelf mixed water andmodified coastal water in the northeastern ECS, the water-exchange between the HS and ECS and thespread of the Changjiang diluted water....

    2020-07-08 08:49:41浏览:22 HuanghaiseaEastChinacoastalwatershelfKuroshiointeraction

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  • Scenario simulation of water security in China

    Limited water resources, increasing demand, low use efficiency, and serious pollution result in severe water resource difficult in China. The evaluation of addressing water problems and the search for effective countermeasures that ensure sustainable water use are key to China's sustainable development. The "compound water security" consists of food security, life security, environmental security, and economic security. By establishing a conceptual model, the water security of China has been simulated in terms of four scenarios called BAU(the business-as-usual scenario), TEC(the technology and economics scenario), IVL(the institution, values, and lifestyles scenario) and TSD(toward sustainable development) in this paper. The results indicated that water crises, especially water shortages, are being experienced now and will continue to do so for a relatively long time in China and that it is possible to reach a basic balance between supply and demand of water and grain under the TSD developing pattern by a series of approaches including technological innovation, policy adjustments, and behaviour inducement....

    2020-07-08 08:49:41浏览:36 waterresourcesecurityscenariossimulationChina

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  • Secondary biogenic coalbed gas in some coal fields of China

    The secondary biogenic coalbed gas, a new genetic and energy source type of coalbed gas in China, has been found in Xinji, Liyazhuang and Enhong areas. The essential characteristics of this type of gas are: (i) the major component of the gas is methane, with C1/C1-5 value higher than 0.99, indicating that the gas is part of dry gas; (ii) the δ13C1 value is in the range of -61.7‰ to -47.9‰, mostly lower than -55‰, which is much lower than the estimated δ13C1 value of thermogenic methane according to the thermal evolution degree of the coal rocks (with Ro value from 0.87%to 1.43%), showing the characteristics of the secondary biogenic gas; (iii) the δD value of methane ranges from -244‰to -196‰; (iv) δ13C 2 value ranges from -26.7‰ to -15.9‰and δ13C 3 value ranges from -10.8‰ to -25.3‰, indicating that the heavier hydrocarbons have a thermogenic origin; (v)the content of CO2 is very low, and δ13Cco2 value changes greatly, reflecting a characteristic of secondary change; (vi)δ15N2 value ranges mainly from -1‰ to +1‰, indicating N2derived significantly from air. The negative linear correlation between the contents of N2 and CH4 reflects the activity of bacteria bearing surface water infiltrating into coal beds.The comprehensive tracing indices show that the coalbed gas in the studied areas is the mixed gas of primarily secondary biogenic gas and a part of remnant thermogenic gas. The uplift of coal beds and the development of faults in the studied areas create favorable conditions for the formation of the secondary biogenic gas....

    2020-06-12 16:17:49浏览:1391 Coalbedgassecondarybiogenicthermogenicdryδ13CδDδ15NChina

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  • Vulnerability and Sustainable Development Mode of Coal Cities in Northeast China

    In this study,by carrying on the spot investigation to the seven coal cities in Northeast China and interviewing with the local authority and the residents,the authors definite the vulnerability that is closed to exposure,sensitivity and resilience,and set up vulnerability model of coal cities in Northeast China.At the same time,the authors broadly illustrate how the components of natural-social-economic system act in the coal area,so as to probe the ways to reduce vulnerability more effectively,such as preferential national policy and so on.Furthermore,the article studies the relationship between vulnerability and sustainable development.Vulnerability is a spatio-temporal function of sustainable development.The regional sustainable development refrains the spiral ascending of vulnerability.And the regional vulnerability and sustainable development appear in turn.Then the article analyzes the natural vulnerability,social vulnerability and economic vulnerability of coal cities in Northeast China.At last,combing vulnerability model and situation of coal cities in Northeast China,the authors put forward regional technology innovation mode,multi-dimension structure transformation mode,attracting investment mode and recycling economy mode to reduce vulnerability....

    2020-06-12 16:17:25浏览:1382 vulnerabilitycoalcitySustainabledevelopmentNortheastChina

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  • Geochemistry of Permian Coal and Its Combustion Residues in Huainan Coalfield, China

    INAA (instrumental neutron activation analysis) was used to determine the contents of trace elements in coal samples from 11 workable Permian coal seams in Huainan coalfield. With XRFS (X-ray fluorescence spectrometry), the geochemical composition of its combustion residues from Tianjiaan Power Plant and Luohe Power Plant was analyzed. In addition, the electron microprobe was employed to study the chemical composition of some fly ashes and bottom ashes. Compared with those of the coals around the world, most trace elements of the Huainan coal are characterized by a normal abundance.Like most coals worldwide, the elements Se, S, As, Sb, Br, U and Cl are enriched in Huainan coal according to Clarks value, while the other elements tend to be diluted. The large fluctuation in the contents of trace elements in this kind of coal demonstrates great differences in coal seams. On the other hand, the contents of these elements are very similar in different bottom and fly ash samples. The elements with low organic affinity tend to concentrate in fly and bottom ash than in coal, especially those elements associated with Fe. However, the elements with strong organic affinity tend to be volatile during the combustion. Moreover, the abundance of the elements in fly ash and bottom ash changes with different densities and with different particle sizes. The bottom and fly ashes consist of glass, lime,mullite, coal residues and ferrite minerals. Some residual chars contain higher contents of volatile elements, such as S, P, Cl and As, indicating that the ash containing more residual chars has a strong adsorption of some hazardous elements, suggesting a possible utilization of power plant ash in the field of water cleaning....

    2020-06-12 16:17:21浏览:1394 coaltraceelementcombustionresiduesGeochemistryINAAChina

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  • A New Understanding on South China Permian Coal-bearing Strata and Coal Accumulation Regularity

    The Longtan Formation was originally thought to belong to the Late Permian, but this study reveals that the lower part of this formation belongs to the Middle Permian. The study proposes the corresponding chronostratigraphic boundary and new schemes for the correlation of geological sections. Based on these schemes a new understanding on the accumulation regularity of Permian coal measures in South China is reached....

    2020-06-12 16:16:47浏览:1405 SouthChinaPermiansequencestratigraphycoal-bearingstratacoalaccumulation

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  • 钱学森的中国梦

    作为中国航天事业奠基人和人民科学家,钱学森毕生追逐科学报国梦想,“竭尽努力建设自己的国家”,为我国科技振兴、国防现代化建设和社会主义事业作出了杰出贡献,堪称广大科技工作者群体中践行中国梦的典型代表。通过对钱学森手稿与文献进行整理与研究发现,钱学森的中国梦,是爱国情怀、奉献精神、求真意识、创新勇气的集成,是立梦、追梦、圆梦、续梦的结合,是爱国之心、报国之情、效国之能、强国之行的统一。从以钱学森为代表的老一辈科学家身上,可以汲取民族复兴的精神力量,为实现中国梦提供精神激励。...

    2020-07-02 21:23:04浏览:1410 航天梦中国梦钱学森人民科学家钱学森精神aerospaceDreamChinaQianXuesenscientistofthe

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  • 中国龙文化

    中国是一个龙的国度。龙文化是中国文化奋发精神的象征,龙文化体现的兼容综合、造福众生、开拓进取、与天和谐的主体精神,是中华文化生生不息的优良传统。文章介绍了龙的起源与发展,阐述了龙的文化意蕴,分析了龙文化的历史意义和现代价值。...

    2020-07-02 21:20:04浏览:1389 中国文化Chinadragonculture

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  • 过程教育研究在中国

    我国对过程教育的引介和研究始于20世纪20年代,但集中研究的出现则是2002年之后。研究者从过程教育基础理论译介入手,对德育理论、课程与教学论、高等教育理论等方面开展了系列应用性研究,取得了重大进展。湛江师范学院美国过程研究中心过程教育研究分部以过程教育的基础理论研究为重点,组成研究团队,形成了一批阶段性理论研究成果,为过程教育理论的系统化作出了贡献。...

    2020-07-02 21:20:04浏览:1395 中国过程教育研究实践Chinaprocesseducationresearchpractice

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