期刊文献+
共找到12,105篇文章
< 1 2 250 >
每页显示 20 50 100
The Input-output Status and Farmers’Willingness to Choose Ecological Operation of Hickory
1
作者 LIU Qiang LI Shi-yong WU Wei-guang 《Asian Agricultural Research》 2012年第11期30-34,共5页
This study takes Lin'an City which early carries out the experiment of ecological operation of hickory as the study site.On the basis of the input-output data on hickory and farmers' land,we analyze the input-... This study takes Lin'an City which early carries out the experiment of ecological operation of hickory as the study site.On the basis of the input-output data on hickory and farmers' land,we analyze the input-output status of hickory land which practises ecological operation,the operators' willingness to accept ecological operation and the influencing factors.The results show that in the short term,ecological operation of hickory will have a certain negative impact on the economic benefits;within the experimental area,the degree of operators' willingness to accept ecological operation of hickory is high,and the operators have a clear understanding of long-term comprehensive benefits which may be brought by ecological operation;the ecological experiment and demonstration of hickory have achieved certain results;family income level,characteristics of householders,education and training,and so on,are the main factors that affect the operators' willingness to choose ecological operation.Finally,for how to further improve the promotion efficiency of ecological operation of hickory,we put forth some constructive recommendations. 展开更多
关键词 input and output WILLINGNESS to CHOOSE ECOLOGICAL
下载PDF
Sustainable Intensification and Large-scale Operation of Cultivated Land Use at the Farmers’ Scale:A Case Study of Shandong Province,China
2
作者 LI Li LYU Xiao +2 位作者 ZHANG Anlu NIU Shandong PENG Wenlong 《Chinese Geographical Science》 SCIE CSCD 2024年第1期149-167,共19页
Sustainable intensification of cultivated land use(SICLU) and large-scale operations(LSO) are widely acknowledged strategies for enhancing agricultural performance.However,the existing literature has faced challenges ... Sustainable intensification of cultivated land use(SICLU) and large-scale operations(LSO) are widely acknowledged strategies for enhancing agricultural performance.However,the existing literature has faced challenges in precisely defining SICLU and constructing comprehensive indicators,which has hindered the exploration of factors influencing LSO within the SICLU framework.To address this gap,we integrated self-efficacy theory into the design of an index framework for evaluating SICLU.We subsequently employed econometric models to analyze the significant factors that impact LSO.Our findings reveal that SICLU can be divided into four key dimensions:intensive management,efficient output,resource conservation,and ecological environment optimization.Furthermore,it is crucial to incorporate belief-based cognitive factors into the index system,as farmers’ understanding of fertilizer and pesticide application significantly influences their willingness to engage in LSO.Moreover,we identify grain market turnover as the most influential factor in promoting LSO,with single-factor contribution rates reaching 70.9% for cultivated land transfer willingness and 62.5% for the total planting areas.Interestingly,unlike irrigation and agricultural machinery inputs,increased labor inputs correspond to larger planting areas for farmers.This trend may be attributed to reduced labor availability because of rural labor migration,whereas the reduction in irrigation and agricultural input is contingent on innovations in production practices and the transfer of cultivated land management rights.Importantly,SICLU dynamically influences LSO,with each index related to SICLU having an optimal range that fosters LSO.These insights offer valuable guidance for policymakers,emphasizing farmers as their central focus,with the adjustment of input and output factors as a means to achieve LSO as the ultimate goal.In conclusion,we propose research avenues for further enriching the SICLU framework to ensure that it aligns with the specific characteristics of regional agricultural development. 展开更多
关键词 sustainable intensification of cultivated land use(SICLU) SELF-EFFICACY status quo bias input and output Boosted Regression Tree willingness to transfer cultivated land cultivated land planting areas Shandong China
下载PDF
Output neighboring-extremal and NCO tracking control in the optimal operation of CSTR
3
作者 许向阳 史晋峰 戴亚平 《Journal of Beijing Institute of Technology》 EI CAS 2013年第2期235-240,共6页
A new optimizing framework of process operation is proposed to deal with optimizing op- eration of continuous stirred tank reactor (CSTR). The optimization framework includes two layers: the first layer, necessary ... A new optimizing framework of process operation is proposed to deal with optimizing op- eration of continuous stirred tank reactor (CSTR). The optimization framework includes two layers: the first layer, necessary condition of optimally (NCO) tracking controller, calculates the optimal set-point of the process; and the second layer, output neighboring-extremal controller, calculates the input values of the controlled plant. The algorithm design and convergent analysis of output neighboring-extremal controller are discussed emphatically, and in the case of existing parametric uncertainty, the approach is shown to converge to the optimum atmost in two iterations. At last the approach is illustrated by simulation results for a dynamic CSTR. 展开更多
关键词 optimizing operation necessary condition of optimally NCO tracking output neigh-boring-extremal control continuous stirred tank reactor (CSTR)
下载PDF
Analysis on Input-Output in Rice Cultivation Based on Cobb-Douglas Production Function 被引量:2
4
作者 高雷 《Agricultural Science & Technology》 CAS 2012年第4期716-718,共3页
[Objective] To analyze the input and output in rice cultivation based on CD function. [Method] Based on the input factors, Cobb-Douglas production (CD) function was used to do the quantitative analysis on the input-... [Objective] To analyze the input and output in rice cultivation based on CD function. [Method] Based on the input factors, Cobb-Douglas production (CD) function was used to do the quantitative analysis on the input-output in rice production with rice growers as the objective. [Result] Considering the substitution effect of labor in- put and capital input, under the same technical conditions, the effect of increasing labor input on the rice production in per 667 m2 was negative, based on which 2 pieces of policy suggestions were put forward to promote the transfer of surplus la- bor force of rice growers and ensure the capital supply for rice production. [Conclusion] This study laid the foundation for the realization of reasonable allocation of rice production resources. 展开更多
关键词 Cobb-Douglas production function Rice cultivation input output
下载PDF
基于Input-Output模型的新疆水资源合理配置研究 被引量:2
5
作者 刘爽 李莉 荣伟 《江西农业学报》 CAS 2018年第5期101-105,109,共6页
根据2007和2012年新疆统计年鉴和投入产出表等相关资料,利用Input-output模型和水资源结构偏差系数对国民经济各产业的用水效率、用水效益指数等进行了分析。研究表明:2012年新疆各产业水资源利用效率和效益显著提高,但农业用水消耗量... 根据2007和2012年新疆统计年鉴和投入产出表等相关资料,利用Input-output模型和水资源结构偏差系数对国民经济各产业的用水效率、用水效益指数等进行了分析。研究表明:2012年新疆各产业水资源利用效率和效益显著提高,但农业用水消耗量远高于其产出效益,第三产业和生态环境产业的水资源消耗呈现递减趋势。此外,工业和建筑业的水资源配置较为合理。最后,为促进新疆水资源优化配置提出了相应的对策建议。 展开更多
关键词 水资源 合理配置 input-output模型 新疆
下载PDF
An Efficient MMI SOI Splitter with Multimode Input/Output Waveguides
6
作者 方青 贺月娇 +2 位作者 辛红丽 李芳 刘育梁 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第2期276-280,共5页
A 1×8 multimode interference power splitter with multimode input/output waveguides in SOI material is designed by the beam propagation method and fabricated by the inductive coupled plasma etching technology for... A 1×8 multimode interference power splitter with multimode input/output waveguides in SOI material is designed by the beam propagation method and fabricated by the inductive coupled plasma etching technology for use in fiber optics communication systems.The fabricated device exhibits low loss and good coupling uniformity.The excess loss is lower than 0 8dB,and the uniformity is 0 45dB at the wavelength of 1550nm.Moreover,the polarization dependent loss is lower than 0 7dB at 1550nm.The device size is only 2mm×10mm. 展开更多
关键词 multimode interference power splitter SOI multimode input/output waveguides
下载PDF
Agricultural Input and Output in Jiangsu Province with Case Analysis
7
作者 杜华章 《Agricultural Science & Technology》 CAS 2014年第11期2006-2010,2025,共6页
[Objective] The aim was to explore interrelationship between agricultural input and output in Jiangsu and the influence degrees of input factors on agricultur-al output. [Method] Quantitative analysis and evaluation w... [Objective] The aim was to explore interrelationship between agricultural input and output in Jiangsu and the influence degrees of input factors on agricultur-al output. [Method] Quantitative analysis and evaluation were made on agricultural input and output in Jiangsu during 1990-2012 as per factor analysis and regression analysis. [Result] The result of factor analysis showed that since the 1990s, the comprehensive efficiency of agricultural input/output in Jiangsu was growing and in-put/output of agriculture, forestry, animal husbandry and fishery, crop farming, and of food production were extracted, whose scores reflect the changes of input/output ef-ficiencies in terms of agriculture, forestry, animal husbandry, fishery, crop farming and food production in the two decades. The results of regression analysis indicated that the effects of the three indices on agricultural output tended to be volatile and the influence degrees were concluded also by regression parameters. [Conclusion] The research provides theoretical references for agricultural input/output structure in Jiangsu Province. 展开更多
关键词 Agriculture input/output Factor analysis Regression analysis Jiangsu Province
下载PDF
On the Balance Between “Input” and “Output” in College English Teaching
8
作者 刘芳 《海外英语》 2016年第1期239-240,242,共3页
The current college English teaching is usually associated with two discouraging words—"time-consuming"and"inefficient", which badly demands some urgent solutions. On the basis of Krashen's In... The current college English teaching is usually associated with two discouraging words—"time-consuming"and"inefficient", which badly demands some urgent solutions. On the basis of Krashen's Input Hypothesis and Swain's Output Hypothesis, this paper elaborates the indispensable and critical roles respectively of input and output in language learning, and proposes a concept of balanced input and output in college English teaching. The paper also presents some personal suggestions as to how to bring the balance into teaching. 展开更多
关键词 COLLEGE English TEACHING input output BALANCE
下载PDF
Input and Output Balance to Assist in Language Competence
9
作者 马滢颖 《海外英语》 2011年第11X期109-110,共2页
Second Language Acquisition(SLA) education in China suffers from an imbalance between language input and output.Reading and listening are the dominate methods used in the classroom,while speaking and writing are used ... Second Language Acquisition(SLA) education in China suffers from an imbalance between language input and output.Reading and listening are the dominate methods used in the classroom,while speaking and writing are used far less.This paper examines the results that are caused by this imbalanced development of comprehensible output and input.Alternative solutions are examined.The results show the limitations in students' abilities that are commonly based on the current methods of teaching.The implications are that policy makers,curriculum developers and teachers should strive to balance the amount of comprehensible input and output through various means. 展开更多
关键词 SECOND LANGUAGE ACQUISITION LANGUAGE input and output
下载PDF
语言学习过程中的“Input”和“Output”类课程特点分析
10
作者 田凤俊 《教育教学论坛》 2010年第11期165-166,共2页
"Input"和"Output"作为语言学习和运用的两个主要方式,历来备受语言研究者和学习者的关注。因此,有关它们的理论著述和观点也颇多。但主要是如何就二者能很好的在中国英语外语环境中得以有效地应用和实践,如在高校... "Input"和"Output"作为语言学习和运用的两个主要方式,历来备受语言研究者和学习者的关注。因此,有关它们的理论著述和观点也颇多。但主要是如何就二者能很好的在中国英语外语环境中得以有效地应用和实践,如在高校英语专业课程群中得以很好的实施则显得非常必要和实用。将所有英语外语课程按照"Input"和"Output"进行分类并按照课程建模的方式进行课程教学和人才培养是本文讨论的主要任务。 展开更多
关键词 input”和“output 语言学习和习得 课程建模 英语外语教学
下载PDF
From Input to Output-Exploring the Role of Intake in English Learning
11
作者 黄志红 《山东师范大学外国语学院学报(基础英语教育)》 2007年第4期7-17,54,共12页
This paper aims to explore the role of intake in second language learning.Based on her literature review and the case of an English lesson in a Chinese secondary school,the author argues that L2 acquisition does not t... This paper aims to explore the role of intake in second language learning.Based on her literature review and the case of an English lesson in a Chinese secondary school,the author argues that L2 acquisition does not take place directly from input to output.In each sqecific part of L2 acquisition process,intake plays various important roles such as filtering,facilitating in comprehensible input and processing in pushed output.In the Chinese foreign language teaching context,it is also found that L2 acquisition is an arduous task for learners to extract information from the input,utilize it in forming a grammar and produce target language forms accurately and fluently.It is the same with L2 teachers who need to play their roles of a controller,a corrector,an organizer and a prompter in the learning process. 展开更多
关键词 英语教学 第二语言习得 中学 输入 输出 消化吸收
下载PDF
Input and Output in Second Language Acquisition
12
作者 李志远 《学周刊(下旬)》 2015年第7期7-7,共1页
Input and output are two major terminal actions in second language acquisition.For these two actions scholars have carried out a great number of researches.Among them the most famous are Krashen’s Input Hypothesis an... Input and output are two major terminal actions in second language acquisition.For these two actions scholars have carried out a great number of researches.Among them the most famous are Krashen’s Input Hypothesis and Output Hypothesis. 展开更多
关键词 英语学习 学习方法 阅读知识 阅读材料
下载PDF
The Study of Strategies in College English Translation Teaching from the Perspective of Input and Output Theory
13
作者 刘莹 《海外英语》 2014年第14期135-136,共2页
Research on SLA gives highlights to English translation teaching. The second language acquisition is a cognitive process of understanding and outputting the second language by making use of strategies, which contains ... Research on SLA gives highlights to English translation teaching. The second language acquisition is a cognitive process of understanding and outputting the second language by making use of strategies, which contains language input, learners' linguistic knowledge, and language output. This paper analyzes language input and output theory and then proposes that we should stress language input by practice and interaction and at the same time focus on the role of language output in college English translation teaching. 展开更多
关键词 ENGLISH TRANSLATION TEACHING LANGUAGE input langua
下载PDF
Input和Output理论在高职高专英语口语教学中的应用*
14
作者 孙淑梅 《贵州商业高等专科学校学报》 2012年第2期76-78,共3页
影响高职高专学生英语口语训练的因素有很多。从Input和Output(输入和输出)理论的角度,分析影响口语发展障碍的成因,并从教、学双重角度考虑,提出相应的教学对策。
关键词 输入输出 英语口语 障碍 教学对策
下载PDF
A Pilot Study on Task Frequency Effects of Input-Output Cycles on EFL Learners’Oral Proficiency
15
作者 王玉山 《中国校外教育》 2012年第9期40-41,共2页
This paper gives a report of the findings of a pilot study on task frequency effects of input-output cycles on EFL learners'oral proficiency.The results showed that the experimental group made greater progress in ... This paper gives a report of the findings of a pilot study on task frequency effects of input-output cycles on EFL learners'oral proficiency.The results showed that the experimental group made greater progress in complexity and accuracy than control groups.We may come to the conclusion that circular input-out benefits learners most.The study may give some insights for foreign language teachers to give second language learners appropriate tasks in listening and speaking classes. 展开更多
关键词 英语教学 教学方法 阅读教学 英语翻译
下载PDF
Adaptive Control Based on Neural Networks for an Uncertain 2-DOF Helicopter System With Input Deadzone and Output Constraints 被引量:15
16
作者 Yuncheng Ouyang Lu Dong +1 位作者 Lei Xue Changyin Sun 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2019年第3期807-815,共9页
In this paper, a study of control for an uncertain2-degree of freedom(DOF) helicopter system is given. The2-DOF helicopter is subject to input deadzone and output constraints. In order to cope with system uncertaintie... In this paper, a study of control for an uncertain2-degree of freedom(DOF) helicopter system is given. The2-DOF helicopter is subject to input deadzone and output constraints. In order to cope with system uncertainties and input deadzone, the neural network technique is introduced because of its capability in approximation. In order to update the weights of the neural network, an adaptive control method is utilized to improve the system adaptability. Furthermore, the integral barrier Lyapunov function(IBLF) is adopt in control design to guarantee the condition of output constraints and boundedness of the corresponding tracking errors. The Lyapunov direct method is applied in the control design to analyze system stability and convergence. Finally, numerical simulations are conducted to prove the feasibility and effectiveness of the proposed control based on the model of Quanser's 2-DOF helicopter. 展开更多
关键词 2-degree of FREEDOM (DOF) helicopter adaptive control input DEADZONE integral barrier Lyapunov function neural networks output constraints
下载PDF
Robust Output Feedback Control for a Class of Nonlinear Systems with Input Unmodeled Dynamics 被引量:4
17
作者 Ming-Zhe Hou Ai-Guo Wu Guang-Ren Duan 《International Journal of Automation and computing》 EI 2008年第3期307-312,共6页
The robust global stabilization problem of a class of uncertain nonlinear systems with input unmodeled dynamics is considered using output feedback, where the uncertain nonlinear terms satisfy a far more relaxed condi... The robust global stabilization problem of a class of uncertain nonlinear systems with input unmodeled dynamics is considered using output feedback, where the uncertain nonlinear terms satisfy a far more relaxed condition than the existing triangulartype condition. Under the assumption that the input unmodeled dynamics is minimum-phase and of relative degree zero, a dynamic output compensator is explicitly constructed based on the nonseparation principle. An example illustrates the usefulness of the proposed method. 展开更多
关键词 Nonlinear systems global stabilization output feedback input unmodeled dynamics high gain
下载PDF
Observer-based H-infinity output feedback control with feedback gain and observer gain variations for Delta operator system 被引量:1
18
作者 Ruiquan LIN Fuwen YANG Renchong PENG 《控制理论与应用(英文版)》 EI 2009年第2期169-174,共6页
Considering that the controller feedback gain and the observer gain are of additive norm-bounded variations, a design method of observer-based H-infinity output feedback controller for uncertain Delta operator systems... Considering that the controller feedback gain and the observer gain are of additive norm-bounded variations, a design method of observer-based H-infinity output feedback controller for uncertain Delta operator systems is proposed in this paper. A sufficient condition of such controllers is presented in linear matrix inequality (LMI) forms. A numerical example is then given to illustrate the effectiveness of this method, that is, the obtained controller guarantees the closed-loop system asymptotically stable and the expected H-infinity performance even if the controller feedback gain and the observer gain are varied. 展开更多
关键词 OBSERVER Delta operator system Robust control output feedback LMI
下载PDF
Comparative and Empirical Study on Vegetable Input-Output Efficiency of Suburban and Rural Areas 被引量:1
19
作者 Li LI Jianmin SHI 《Asian Agricultural Research》 2015年第2期23-28 33,33,共7页
On the basis of comparative analysis on the vegetable input-output efficiency of suburban and rural areas in 2011- 2012,this paper made co-integration test,impulse response and variance decomposition for the vegetable... On the basis of comparative analysis on the vegetable input-output efficiency of suburban and rural areas in 2011- 2012,this paper made co-integration test,impulse response and variance decomposition for the vegetable input-output relationship of suburban areas in 1998-2012. Comparative analysis indicated that the vegetable input-output benefit of suburban area declines,while that of rural area rises; empirical analysis indicated that there is a long-term stable relationship between labor cost of vegetable planting and vegetable income and between material cost of vegetable planting and vegetable income,but the vegetable income itself has certain lag effect,followed by material cost,and the labor cost has minimum influence. Finally,it came up with recommendations for improving suburban vegetable input-output relationship,including improving vegetable input security mechanism,improving farmers' quality and innovation ability,and increasing technological input. 展开更多
关键词 VEGETABLE input VEGETABLE output SUBURBAN area Rur
下载PDF
LOW-POWER LVDS I/O INTERFACE FOR ABOVE 2GB/S-PER-PIN OPERATION 被引量:3
20
作者 Wang Xihu Wu Longsheng Liu Youbao 《Journal of Electronics(China)》 2009年第4期525-531,共7页
Low Voltage Differential Signaling (LVDS) has become a popular choice for high-speed serial links to conquer the bandwidth bottleneck of intra-chip data transmission. This paper presents the design and the implementat... Low Voltage Differential Signaling (LVDS) has become a popular choice for high-speed serial links to conquer the bandwidth bottleneck of intra-chip data transmission. This paper presents the design and the implementation of LVDS Input/Output (I/O) interface circuits in a standard 0.18 μm CMOS technology using thick gate oxide devices (3.3 V), fully compatible with LVDS standard. In the proposed transmitter, a novel Common-Mode FeedBack (CMFB)circuit is utilized to keep the common-mode output voltage stable over Process, supply Voltage and Temperature (PVT) variations. Because there are no area greedy resistors in the CMFB circuitry, the disadvantage of large die area in existing transmitter structures is avoided. To obtain sufficient gain, the receiver consists of three am- plifying stages: a voltage amplifying stage, a transconductance amplifying stage, and a transimpedance amplifying stage. And to exclude inner nodes with high RC time constant, shunt-shunt negative feedback is introduced in the receiver. A novel active inductor shunt peaking structure is used in the receiver to fulfill the stringent requirements of high speed and wide Common-Mode Input Region (CMIR) without voltage gain, power dissipation and silicon area penalty. Simulation results show that data rates of 2 Gbps and 2.5 Gbps are achieved for the transmitter and receiver with power con- sumption of 13.2 mW and 8.3 mW respectively. 展开更多
关键词 input/output (I/O) Low Voltage Differential Signaling (LVDS) TRANSMITTER Receiver Active inductor shunt peaking
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部