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In about a century' s time, their livelihood of swidden agriculture has been changing greatly along with the natural and social environment change. Before 1950s, as a minor group frequently move in the subtropical mountainous area characterized by scarce arable land, high forest coverage rate and sparse population, Kemu people has long been engaged in swidden agriculture which was simple, called for no sophisticated production tools and was suitable for frequent movement. At that time, they adapted to the environment change mainly by moving frequently from one place to another, and their livelihood was featured by complete dependence on environment, frequent movement and swiddening without continuous cultivation. From 1950s to early 1970s, their way of adaptation changed into migration within defined territory and shortterm fallow featured by complete dependence on environment, migration within limited area and short fallow. In early 1970s, they leaned from outside to cultivate irrigated fields and plant cash forest and their livelihood was featured by complete dependence on environment and agro-forestry.
近一个世纪以来,随着其所处自然环境和社会环境的变迁,其刀耕火种的生计方式在不断地变化:20世纪50年代以前,作为频繁迁徙于山多地少、森林覆盖率高、人烟稀少的热带、亚热带山区的弱小族群,以开发容易,便于流动作业不需要复杂生产设施的刀耕火种为其传统的生计方式,主要以迁徙的方式对环境变迁进行调适,其刀耕火种生计方式的特征表现为完全依赖型、随意迁徙型、无轮作型;20世纪50年代至70年代,其主要以固定区域内迁徙和短期轮作的方式对环境变迁进行调适,其刀耕火种生计方式的特征表现为完全依赖型、在固定区域迁徙型、短期轮作型刀耕火种;20世纪70年代初,其主要以外文化——开拓水田及人工造林的方式对环境变迁进行调适,其刀耕火种生计方式的特征表现为部分依赖型、粮林轮作型刀耕火种;20世纪80年代以后,其主要以发展橡胶种植业对环境变迁进行调适,其刀耕火种生计方式的特征表现为暂时依赖型刀耕火种。
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Theequivalence percolation resistance law is accurate enough to be used in productivitycalculation of horizontal well pattern.(3) Productivity of mixed well pattern of horizontalwell or multilateral horizontal well and vertical well is constructed and formulae are simpleenough to be used in the oilfield. The patterns include 5-spot pattern,7-spot pattern and9-spot pattern.(4) Productivity formula of united rectangular well pattern of horizontaland vertical wells is constructed. By this formula, the calculation results show that fora horizontal well length, there is a shape factor at which the productivity of the patternis biggest. So optimum method of the well pattern is proposed.(5) A new concept ofdimensionless length of horizontal well is advanced and the relationship of optimum shapefactor of the rectangular well pattern against dimensionless length of horizontal well ispresented. The influences of length of the horizontal well, area of the well pattern unitand the thickness of reservior are concerned.
利用该公式计算表明:当水平井长度一定时,存在一个最优井网形状,使得水平井的产能最大,在此基础上提出了水平井井网的优化方法;(5)提出了水平井无因次长度的概念,给出了联合井网最优井网形状因子与水平井无因次长度的关系式,并对水平井长度、油层厚度及井网面积对产能的影响进行了分析;(6)推导出了一无限水平井井排在XY 平面内势的解析解,为不同水平井整体开发井网或水平井和直井井网整体开发渗流理论的研究奠定了理论基础;(7)建立了交错式水平井与直井整体开发渗流理论,给出了拟三维条件下井网产能的精确解析解及该井网最优井网形状因子与水平井无因次长度的关系,并对产能的影响因素进行了分析;(8)建立了水平井与水平井正排列井网、交错排列井网条件下渗流理论及井网产能在拟三维条件下的精确解析解,给出了交错井网条件下最优井网形状因子与水平井无因次长度的关系,通过与正方形井网对比,说明优化井网可大幅度提高开采效果;(9)建立了分支水平井和直井面积井网水油两相非活塞驱替条件下渗流问题的解析解,给出了见水前后无因次产量与无因次时间的关系式以及见水时间等。
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Throughout the show, Latifah appeared in spoofs of "Twilight" and "Paranormal Activity," which featured a cameo by Cloris Leachman clad in a sexy leather ensemble.The show also featured performances by Mary J. Blige, Cobra Starship and Nicole Scherzinger, as well as debut footage from "Robin Hood" and "Survivor: Heroes vs. Villains."
整个展示,歌手的提法出现在&曙光&和&超自然的活动&,其特色是短暂Leachman由Cloris穿着性感的皮革合奏这个演出表演Blige之星,玛丽,妮可Scherzinger眼镜蛇,以及首次拍摄于&罗宾汉&和&幸存者:英雄与坏人。&
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