[Objective] This study aimed to investigate the effects of different planting and irrigation patterns on water consumption characteristics and dry matter produc- tion and allocation of winter wheat. [Method] With high...[Objective] This study aimed to investigate the effects of different planting and irrigation patterns on water consumption characteristics and dry matter produc- tion and allocation of winter wheat. [Method] With high-yield winter wheat cultivar Jimai 22 as the experimental material, field experiment was conducted during 2008- 2010. A total of 3 planting patterns were designed, uniform row, wide-narrow row and furrow. Under each planting pattern, total four irrigation patterns were designed, no irrigation （Wo）, irrigation at jointing state （Wl）, irrigation at jointing and anthesis stages （W2） and irrigation at jointing, anthesis and milking stages （W3）, and the irri- gation amount per treatment was all 60 mm. [Result] Under the three planting pat- terns, with the increased irrigation amount, the total water consumption of the exper- imental field increased; the proportion of irrigation in the total water consumption in- creased, and that of soil water consumption in the total water consumption de- creased significantly. Compared with W0 treatment, various irrigation treatments sig- nificantly increased the post-anthesis dry matter accumulation in wheat plants; with the increased irrigation amount, the grain yield under the three planting patterns all increased, while the water use efficiency （WUE） decreased. Under the same irriga- tion conditions, compared with other two planting patterns, furrow planting increased the total water consumption of the experimental field, increased the proportion of soil water consumption in the total water consumption, and improved the WUE and wheat grain yield. [Conclusion] Under the experimental conditions, considering both wheat grain yield and WUE, furrow planting with moderately deficit irrigation at joint- ing and anthesis stages is more suitable for the winter wheat production in North China Plain.展开更多
Abstract Based on Second National Land Survey during 2007-2009 and land use type survey in ftatland areas, status quo of land use in mountainous areas in Yun- nan was measured, and analysis was made on land use in mou...Abstract Based on Second National Land Survey during 2007-2009 and land use type survey in ftatland areas, status quo of land use in mountainous areas in Yun- nan was measured, and analysis was made on land use in mountainous areas in terms of land use structure, degree and development potential, providing references for rational use of land in mountainous areas in Yunnan.展开更多
In this paper, the dynamic characteristics are examined for a cylindrical membrane composed of a transversely isotropic incompressible hyperelastic material under an applied uniform radial constant pressure at its inn...In this paper, the dynamic characteristics are examined for a cylindrical membrane composed of a transversely isotropic incompressible hyperelastic material under an applied uniform radial constant pressure at its inner surface. A second-order nonlinear ordinary differential equation that approximately describes the radial oscillation of the inner surface of the membrane with respect to time is obtained. Some interesting conclusions are proposed for different materials, such as the neo-Hookean material, the Mooney-Rivlin material and the Rivlin-Saunders material. Firstly, the bifurcation conditions depending on the material parameters and the pressure loads are determined. Secondly, the conditions of periodic motion are presented in detail for membranes composed of different materials. Meanwhile, numerical simulations are also provided.展开更多
建筑科学领域高质量科技期刊分级目录期刊High-quality Sci-Tech Journal of Building Science,certificated by CAST and ASC中国科技核心期刊Source Journal for Chinese Scientific and Technical Papers and Citations,certificated...建筑科学领域高质量科技期刊分级目录期刊High-quality Sci-Tech Journal of Building Science,certificated by CAST and ASC中国科技核心期刊Source Journal for Chinese Scientific and Technical Papers and Citations,certificated by ISTIC RCCSE中国核心学术期刊China Core Academic Journal of RCCSE《建筑节能(中英文)》杂志,是由中国建筑东北设计研究院有限公司主管,中国建筑东北设计研究院有限公司、中国建筑节能协会主办的国家级建筑节能专业技术期刊。展开更多
运行数据显示全光纤电流互感器(fiber optic current transformer,FOCT)在极端环境下(温度为–45~85℃、振动加速度>15 m/s^(2))故障概率明显偏高,因此研究极端环境对FOCT性能的影响十分必要。在分析FOCT工作原理基础上,重点讨论了F...运行数据显示全光纤电流互感器(fiber optic current transformer,FOCT)在极端环境下(温度为–45~85℃、振动加速度>15 m/s^(2))故障概率明显偏高,因此研究极端环境对FOCT性能的影响十分必要。在分析FOCT工作原理基础上,重点讨论了FOCT核心模块的结构特征及极端环境的影响,并建立FOCT传变模型。根据FOCT真实工作环境,分析了极端环境对其测量准确性的影响。结果表明:温度的升高、光纤长度的增加、振动加速度的变大,都会使FOCT比差增大,测量精度下降。特别是在极端环境下,测量误差较大,无法满足0.2S级测量准确度的要求。为验证模型的可靠性,开展了温度和振动影响试验。针对现有试验缺乏对极端环境的考核,提出增加测点的温度试验方法和增加振动响应试验及振动耐久试验的振动试验方法。试验结果与仿真结果对比表明:两者结果具有一致性,偏差电流波形变化趋势比较一致。该研究为FOCT可靠性问题提供有益参考。展开更多
基金Supported by Scientific and Technological Development Plan of Shandong Province(2014GNC113001)Open Fund for National Key Laboratory of Crop Biology(2014KF11)
文摘[Objective] This study aimed to investigate the effects of different planting and irrigation patterns on water consumption characteristics and dry matter produc- tion and allocation of winter wheat. [Method] With high-yield winter wheat cultivar Jimai 22 as the experimental material, field experiment was conducted during 2008- 2010. A total of 3 planting patterns were designed, uniform row, wide-narrow row and furrow. Under each planting pattern, total four irrigation patterns were designed, no irrigation （Wo）, irrigation at jointing state （Wl）, irrigation at jointing and anthesis stages （W2） and irrigation at jointing, anthesis and milking stages （W3）, and the irri- gation amount per treatment was all 60 mm. [Result] Under the three planting pat- terns, with the increased irrigation amount, the total water consumption of the exper- imental field increased; the proportion of irrigation in the total water consumption in- creased, and that of soil water consumption in the total water consumption de- creased significantly. Compared with W0 treatment, various irrigation treatments sig- nificantly increased the post-anthesis dry matter accumulation in wheat plants; with the increased irrigation amount, the grain yield under the three planting patterns all increased, while the water use efficiency （WUE） decreased. Under the same irriga- tion conditions, compared with other two planting patterns, furrow planting increased the total water consumption of the experimental field, increased the proportion of soil water consumption in the total water consumption, and improved the WUE and wheat grain yield. [Conclusion] Under the experimental conditions, considering both wheat grain yield and WUE, furrow planting with moderately deficit irrigation at joint- ing and anthesis stages is more suitable for the winter wheat production in North China Plain.
基金Supported by National Natural Science Foundation of China(41261018)~~
文摘Abstract Based on Second National Land Survey during 2007-2009 and land use type survey in ftatland areas, status quo of land use in mountainous areas in Yun- nan was measured, and analysis was made on land use in mountainous areas in terms of land use structure, degree and development potential, providing references for rational use of land in mountainous areas in Yunnan.
基金Project supported by the National Natural Science Foundation of China (Nos. 10872045 and 10772104)the Program for New Century Excellent Talents in University (No. NCET-09-0096)the Fundamental Research Funds for the Central Universities (No. DC10030104)
文摘In this paper, the dynamic characteristics are examined for a cylindrical membrane composed of a transversely isotropic incompressible hyperelastic material under an applied uniform radial constant pressure at its inner surface. A second-order nonlinear ordinary differential equation that approximately describes the radial oscillation of the inner surface of the membrane with respect to time is obtained. Some interesting conclusions are proposed for different materials, such as the neo-Hookean material, the Mooney-Rivlin material and the Rivlin-Saunders material. Firstly, the bifurcation conditions depending on the material parameters and the pressure loads are determined. Secondly, the conditions of periodic motion are presented in detail for membranes composed of different materials. Meanwhile, numerical simulations are also provided.
文摘建筑科学领域高质量科技期刊分级目录期刊High-quality Sci-Tech Journal of Building Science,certificated by CAST and ASC中国科技核心期刊Source Journal for Chinese Scientific and Technical Papers and Citations,certificated by ISTIC RCCSE中国核心学术期刊China Core Academic Journal of RCCSE《建筑节能(中英文)》杂志,是由中国建筑东北设计研究院有限公司主管,中国建筑东北设计研究院有限公司、中国建筑节能协会主办的国家级建筑节能专业技术期刊。
文摘运行数据显示全光纤电流互感器(fiber optic current transformer,FOCT)在极端环境下(温度为–45~85℃、振动加速度>15 m/s^(2))故障概率明显偏高,因此研究极端环境对FOCT性能的影响十分必要。在分析FOCT工作原理基础上,重点讨论了FOCT核心模块的结构特征及极端环境的影响,并建立FOCT传变模型。根据FOCT真实工作环境,分析了极端环境对其测量准确性的影响。结果表明:温度的升高、光纤长度的增加、振动加速度的变大,都会使FOCT比差增大,测量精度下降。特别是在极端环境下,测量误差较大,无法满足0.2S级测量准确度的要求。为验证模型的可靠性,开展了温度和振动影响试验。针对现有试验缺乏对极端环境的考核,提出增加测点的温度试验方法和增加振动响应试验及振动耐久试验的振动试验方法。试验结果与仿真结果对比表明:两者结果具有一致性,偏差电流波形变化趋势比较一致。该研究为FOCT可靠性问题提供有益参考。
