Exact solution of entanglement of the double Jaynes—Cummings model without rotating wave approximation

This paper investigates the influences of atom--field coupling and dipole--dipole coupling for atoms on the entanglement between two atoms by means of concurrence. The results show that the sudden death occurs when the atom--field coupling is strong enough, and the collapse and the revival appear when the dipole--dipole interaction is strong enough.     

Spatial variation and driving mechanism of soil organic carbon components in the alluvial/sedimentary zone of the Yellow River

Alluviation and sedimentation of the Yellow River are important factors influencing the surface soil structure and organic carbon content in its lower reaches. Selecting Kaifeng and Zhoukou as typical cases of the Yellow River flooding area, the field survey, soil sample collection, laboratory experiment and Geographic Information System(GIS) spatial analysis methods were applied to study the spatial distribution characteristics and change mechanism of organic carbon components at different soil depths. The results revealed that the soil total organic carbon(TOC), active organic carbon(AOC) and nonactive organic carbon(NOC) contents ranged from 0.05–30.03 g/kg, 0.01–8.86 g/kg and 0.02–23.36 g/kg, respectively. The TOC, AOC and NOC contents in the surface soil layer were obviously higher than those in the lower soil layer, and the sequence of the content and change range within a single layer was TOCNOCAOC. Geostatistical analysis indicated that the TOC, AOC and NOC contents were commonly influenced by structural and random factors, and the influence magnitudes of these two factors were similar. The overall spatial trends of TOC, AOC and NOC remained relatively consistent from the 0–20 cm layer to the 20–100 cm layer, and the transition between high-and low-value areas was obvious, while the spatial variance was high. The AOC and NOC contents and spatial distribution better reflected TOC spatial variation and carbon accumulation areas. The distribution and depth of the sediment, agricultural land-use type, cropping system, fertilization method, tillage process and cultivation history were the main factors impacting the spatial variation in the soil organic carbon(SOC) components. Therefore, increasing the organic matter content, straw return, applying organic manure, adding exogenous particulate matter and conservation tillage are effective measures to improve the soil quality and attain sustainable agricultural development in the alluvial/sedimentary zone of the Yellow River.     

新疆非物质文化遗产的空间分布及其影响因素

基于国家级和自治区级非物质文化遗产（简称非遗）资源空间数据,集成相关自然地理环境和社会经济文化数据,采用最邻近分析、核密度估计和全局空间自相关分析,研究新疆非遗的空间分布规律和集聚特征,采用地理探测器模型深入探究影响新疆非遗空间分布的自然因素、经济因素和社会文化因素。结果表明：新疆非遗空间分布呈现北多南少的特征,主要集中在喀什、伊犁、塔城、巴州和乌鲁木齐等地（市、州）;新疆非遗在空间上具有明显的集聚特征,不同类型非遗的集聚程度也有差异,在空间上形成了乌鲁木齐-吐鲁番-库尔勒为核心的一级组团、伊宁和喀什为核心的二级组团以及以塔城、哈密和阿克苏为中心的若干三级组团。新疆非遗空间分布受自然因素、经济因素、社会文化因素的综合影响：社会文化因素（0.5494）>经济因素（0.4597）>自然因素（0.2285）。自然因素和经济因素、社会文化因素的协同效应对非遗空间分布的影响更明显。     

中国北方酿酒葡萄气候适宜性区划

根据中国北方地区183个气象台站1971-2000年逐旬气象资料,结合北方六省区酿酒葡萄取样化验结果和其它区划指标,采用主导因子法以7～8月水热系数为一级区划指标,以7～9月≥10℃积温为二级区划指标,另外考虑了年≥10℃的活动积温、冬季1月份月平均气温,将中国北方酿酒葡萄适宜区划分为4级,即最优区、适宜区、次适宜区和不适宜区,利用MCAPS系统图形分析功能,制作了中国北方地区酿酒葡萄品质的气候适宜性区划图,提出各区域酿酒葡萄发展的限制气候因子和生产建议,为中国发展优质酿酒葡萄产业化发展和基地选择提供理论参考.     

盐酸-碱金属氯化物-水三元体系和HCl-LiCl-MgCl 2-H2O四元体系 热力学性质研究综述

H ,L i ,Mg2 / Cl-- H2 O四元体系 0°C,2 0°C,4 0°C的溶解度预测中需要大量参数 ,而这些参数的获得 ,依赖于盐酸 -碱金属氯化物 -水三元体系和 HCl- L i Cl- Mg Cl2 - H2 O四元体系的热力学性质。总结了近 50年来国内外对上述体系的热力学性质的研究 ,为 H ,L i ,Mg2 / Cl-- H2 O四元体系 0°C,2 0°C,4 0°C的溶解度预测奠定基础 ,同时为 Pitzer模型增添更合理的参数。     

Rb2CO3-CH3CH2OH-H2O三元体系20°C相平衡的研究

研究了Rb2 CO3-CH3CH2 OH -H2 O体系在 2 0°C下的相平衡 ,绘制了相应的溶度图。发现Rb2 CO3·2 .5H2 O的新物相 ,与以往报道的结果不一致     

Resolving the landfill siting impasse: modelling technocratic and indigenous perspectives using GIS multicriteria approach

Increase in waste generation calls for an effective waste management as this has become a necessity for environmental sustainability. Several methods are adopted in managing waste, which include waste reduction, reuse, thermal treatment, recycling and landfilling. The landfill method is recognised as the most used of all the waste management methods in developing countries such as Ghana. However, the selection of a suitable landfill site is very difficult and tedious. This is because it involves a consideration of many factors such as environmental, topographic, economic, socio-cultural and civil engineering. This research sought to identify a suitable landfill site by applying GIS multicriteria and weighted overlay approach in the Bongo District of Northern Ghana. The analysis relied on criteria and weights provided by the technocrats and the indigenes in the district as a way of demonstrating how landfill siting impasse can be resolved by incorporating the various stakeholders. The results obtained provided clear areas for landfill sites in the study area from the technocratic and the indigenous perspectives. However, the technocratic perspective failed to include an important cultural criterion, sacred groves, as a factor. The indigenous perspective also compromised on the factor related to nearness to residential areas, and is equally not sufficient on its own. The optimal landfill sites, which meets the expectations of both the technocrats and indigenes, was identified. This perspective has produced technically favourable and socio-culturally acceptable landfill site. However, it is recommended an environmental impact assessment (EIA) be conducted to identify the full environmental and social cost of the site. It is concluded that in landfill site selection much attention be given to cultural factors in the same way as the technical factors.     

沙区绿洲人地系统演进探讨——以民勤盆地为例

资源与环境问题已成为当代人类生存与发展的重大问题,它通过人地系统中人与地之间的相互联系,以各种方式和强度作用于人类。人地系统有其运行规律和演进机制,要建立协调的人地关系、促进沙区绿洲的可持续发展,就必须清楚地了解其人的地系统的动态演进机制。通过分析民勤盆地人地系统的演进过程,提出了人地系统演进的机制和驱动力,从而为更好地调控沙区绿洲人地系统的演进提供依据。     

甘肃省城市化与土地集约利用耦合协调发展

土地集约利用能够促进城市化健康发展,而城市化水平又影响着土地集约利用水平,两者的耦合协调程度是影响城市发展的关键因素。本文对甘肃省12个地级市进行实证研究,构建城市化与土地集约利用的耦合协调发展度模型,定量评价两者之间的耦合协调发展状况,并且利用地理空间分析工具进行空间聚类分析。结果表明:多数市已经从拮抗期过渡到磨合期,但是还没有进入协调期,说明甘肃省城市化与土地集约利用之间还未完全达到完全协调发展的程度;甘肃省城市化与土地集约利用的耦合协调发展度普遍较低,从2003年开始呈现出逐年扩张的趋势。