Study on RS- and GIS-based ecological capital assessment in arid areas

Ecological capital assessment is currently one of the important research contents in the interdisciplinary field of ecology, resources economics, environmental economics and ecological economics. To scientifically assess ecological capital redounds to decision-makers to consider the ecological cost in economic development, and is also necessary for sustainable economic development in arid areas. Based on the theory of landscape ecology in this paper the per unit area ecological capital values in arid areas are researched by using the Landsat TM data, CBERS satellite data, meteorological data, MODIS satellite data and other ecological data, and the RS- and GIS-based models of assessing ecological capital values in arid areas are developed. Moreover, based on the field-measured data, a case study on ecological capital assessment in the Manas River basin, Xinjiang in 2003 is carried out. The basin is divided into 4 ecological capital areas so as to quantitatively calculate the ecological capital values of the ecosystems, analyze the spatial distribution of ecological capital, and chart the maps of spatial distribution of ecological capital. The results show that the total ecological capital value of the ecosystems in the Manas River basin in 2003 was 1.49454×10^11 yuan RMB. In spatial distribution, the ecological capital decreases from the alpine zones to the plains and from the oases to the deserts, which accords with the distribution of vegetation zonality in this arid area. The assessed results can objectively reflect the ecological capital and its spatial distribution in the aridbasin, and can also provide reference for roundly carrying out the assessment of ecological capital in arid areas.     

移动学习研究现状概述与思考

移动学习是一个新的学习模式，是教育技术领域研究的一个新热点，国内外许多专家学者都纷纷投入到移动学习的研究中来、概述移动学习目前的研究状况和研究成果的主要意义是：展示移动学习研究的历时状态，进一步推动对移动学习的研究．     

测角网观测纲要优化的一种方法

本文应用控制网优化理论对测角网观测纲要的优化作了理论推证，并以实例验证了其可行性。对于指导生产实践、提高经济效益具有一定的实用价值     

Evaluation and characterization of an endosperm-specific sbeⅡa promoter in wheat

Hexaploid wheat (bread wheat) is widely grown all over the world. Wheat grain, which contains high levels of starch and protein located in the endosperm, is being developed as a 揵ioreactor?using the new gene transfor-mation technology[1]. Some new traits (such as virus and insect resistance) have been successfully introduced into key cereal crops using transgene technology, however, there are only a few reports on the studies of transgene expression in wheat because of technical difficulties…     

Orientation of the peptide formation of N-phosphoryl amino acids in solution

The peptide formation of N-phosphoryl amino acids with amino acids proceeds in aqueous solution without any coupling reagents. After being separated in sephadex gel column, the phosphoryl dipeptides were analyzed by the electrospray ionization tandem mass spectrometry (ESIMS/ MS). The result demonstrates that phosphoryl dipeptides were detected in all the reaction systems. It is found that the formation of N-phosphoryl dipeptides is oriented: the N-terminal amino acid residues of the N-phosphoryl dipeptides are from N-phosphoryl amino acids, and the peptide elongation happened at the C-terminal. Only a-dipeptide, no b-dipeptide, is formed in the N-phosphoryl dipeptides, showing that a-carboxylic group is activated selectively by N-phosphorylation. Theoretical calculation shows that the peptide formation of N-phosphoryl amino acids might happen through a penta-coordinate carboxylic-phosphoric intermediate in solution. These results might give some clues to the study on the origin of proteins and protein biosynthesis.     

Orientation of the peptide formation of N-phosphoryl amino acids in solution

The peptide formation of N-phosphoryl amino acids with amino acids proceeds in aqueous solution without any coupling reagents. After being separated in sephadex gel column, the phosphoryl dipeptides were analyzed by the electrospray ionization tandem mass spectrometry (ESIMS/ MS). The result demonstrates that phosphoryl dipeptides were detected in all the reaction systems. It is found that the formation of N-phosphoryl dipeptides is oriented: the N-terminal amino acid residues of the N-phosphoryl dipeptides are from N-phosphoryl amino acids, and the peptide elongation happened at the C-terminal. Only a-dipeptide, no β-dipeptide, is formed in the N-phosphoryl dipeptides, showing that a-carboxylic group is activated selectively by N-phosphorylation. Theoretical calculation shows that the peptide formation of N-phosphoryl amino acids might happen through a penta-coordinate carboxylic-phosphoric intermediate in solution. These results might give some clues to the study on the origin of proteins and protein biosynthesis.     

城市形象对旅游目的地形象的影响——以西安留学生为例

以西安为例,客源以留学生为主运用多元线性回归模型研究城市形象对旅游目的地形象的影响.主要结论是:①留学生对西安城市形象的感知是积极正面的,其中对西安是"世界历史文化名城"的感知最好,对"噪声污染低"的感知最差;②留学生对西安旅游目的地形象的感知也是积极正面的,其中对西安是"安全"的旅游目的地的感知最好,普遍认为西安的"旅游景点值得游览","古建筑有吸引力";③城市形象对旅游目的地形象具有显著影响,但不同的城市形象因子对目的地形象因子的影响显著性水平不同.本研究首次对城市形象和旅游目的地形象的关系进行了实证分析,丰富了城市形象和旅游目的地形象研究内容.     

琼东南盆地深水区陵水凹陷古近纪同沉积断裂对层序构成样式的控制

综合利用地质与地球物理资料,并根据断层组合样式及活动速率分析,对陵水凹陷古近系开展同沉积断裂对层序构成样式的控制性研究。结果表明:陵水凹陷西部、中部及东部识别出非对称地堑型、对称地堑型、半地堑型3种构造地层格架;由于断层活动性变化,陵水凹陷古近系发育上倾坡脚型断坡带、下倾坡脚型断坡带与弯折带3种构造古地貌背景,并分别控制3种沉积充填样式的发育;不同的沉积充填配置在不同的构造地层格架中组成了对储集体展布具有重要预测作用的层序构成样式,为深水区隐蔽油气藏的勘探提供基础。     

消防安全课程模块实验教学研究

消防安全类课程是安全工程专业的主干课程,实验教学是此专业人才能力培养的重要环节和必要手段。文中在探讨了消防安全类课程实验教学现状的基础上,针对消防安全类课程的教学大纲和学生培养计划制定了从学科基础到技术层次再到工程层次的实验体系并根据教学内容的不同划分了三个层次,为培养具有高素质以及创新能力的人才奠定了基础.     

一种敏捷服务组合方法模型的研究与设计

针对目前服务组合技术复杂性高、成本高以及灵活性不足等问题,提出一种敏捷服务组合方法模型。该模型以Web服务组件作为服务组合的基本单元,摆脱了传统服务组合对专业技术人员的依赖;通过设计一种轻量级流程控制器,使得服务组合流程不依赖于任何重量级的服务器,组合结果得以实时反馈;通过Web服务组件部署器的设计,实现了基本的服务组合流程可被更复杂的服务重用。通过在企业应用集成项目中的应用,验证了该模型所实现的服务组合具有更好的易用性和灵活性。