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Search Results: 1 - 10 of 127381 matches for " 杨竹莘 "
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张家界水环境演变与旅游发展关系
全华,陈田,
地理学报 , 2002, DOI: 10.11821/xb200205015
Abstract: 通过实地监测并全面分析张家界国家森林公园水环境演变趋势,发现金鞭溪水质下降最为明显,而且随着游客的逐年增多,呈现出加速恶化的趋势。金鞭溪水质恶化主要表现为蓝藻、绿藻迅速繁殖,感官质量下降。主要原因是上游接待区锣鼓塔排出的污水中总磷超标。通过建立基于环境脆弱因子的动态阈值模型,计算得出在不超出张家界景区最为脆弱的环境因子---金鞭溪水质标准总磷≤0.02前提下,金鞭溪上游接待区住宿设施生态阈值春季临界床位数为1186,夏季为3057,冬季为545,秋季为333。
城市水域问题与休闲旅游利用国际经验
全华,,赵磊
地域研究与开发 , 2011,
Abstract: 我国城市光艳的外表已为绝大多数发达国家城市所不及,但城市水域,特别是位于阴暗角落不被关注的城乡结合部、行政区划过渡地带、部门属地分界线等处的河网水体及其岸滩,常年积污纳垢,沦为景观美化与环境保护的“公地悲剧”,成为威胁民生的顽疾。实地踏勘了上海、北京、大连等城市水域,也实地考察了美国芝加哥、纽约、圣安东尼奥、迈阿密等城市水域,发现中美两国城市水域环境差别很大。发达国家以美化水域景观和开展休闲旅游的方式维护水域治理成果,这种提高国民幸福感的经验值得借鉴。
The Dynamic Threshold and the Tendency in Zhangjiajie Tourist and Ecological Environment
张家界水环境演变与旅游发展关系

QUAN Hu,CHEN Tian,YANG Zhuxin,
全华
,陈田,

地理学报 , 2002,
Abstract: Zhangjiajie was the first National Forest Park in China. It is also a National Key Scenic Zone, a National Geological Park,and a World Natural Heritage site. With the development of Zhangjiajie's tourist industry, the ecological environment quality of scenic zones began to deteriorate yearly. And this attracted the attention of the World Heritage Spot Committee of UNESCO. The main ecological environmental problems in Zhangjiajie core scenic spots are: The water quality in Jinbian Stream has evidently been deteriorated.. Having done some field monitoring and overall analysis of the trend of environment in Zhangjiajie, we found that the influence of accommodting facilities on the environment is greater than that of the other amusement facilities. So the major influential factor of Zhangjiajie tourist ecological environment is the influence of accommodating facilities on environment. The great changes in the variation of the water quality monitoring value in scenic spots have taken place. That means the water body is the most fragile environmental factor in the ecological environment of the scenic spots. Due to the increasing number of tourists year after year, the deteriorative trend of ecological environment has appeared. As we know from the following analysis: (1) The renovation of the scenic spots environment often fail to focus on the accommodating facilities even though they are not located within the scenic spot, yet still in the upstream area. (2) The fragile ecological environment factor---the changeable curvies of water body environment quality are similar with the increasing curves of the accommodated tourists. The former is left far behind the latter. (3) The sympton of the water deterioration can be seen from the fact that blue algae, and green algea, the phosphate has surpassed the standard. They are the causes of the deterioration of the water quality in the scenic spots. (4) The scope of accommodating facilities in the upstream area has surpassed its ecological threshold, and the excessive use of phosphate in detergents has led to the total phosphate's surpassing the standard. (5) Because of the different number of residents and services, different seasons, areas, so different drainage processing methods should be used. A threshold model for the most fragile environment factor is built into this paper. From the calculation we recommend that: On condition of no surpassing the set water standard in Zhangjiajie---the most fragile environment factor, that is the total phosphate content ≤0.02 ---the ecological threshold of the tourist environment in the upstream of scenic spots. The number of tourists be as follows: n Spring 1186 beds, Summer 3057 beds, Autumn 545, Winter 333.. Different types of scenic zones, the fragile ecological environment factors are different from each other. We follow the same process as this paper recommends,we can calculate the threshold of other scenic zones in the country.
基于子空间法的盲信道和半盲信道估计方法
,,
北京邮电大学学报 , 2008, DOI: 10.13190/jbupt.200803.29.yul
Abstract: 为了降低算法的复杂度,提出采用降秩正交迭代方法估计噪声子空间.利用色噪声预白化技术对过采样后的自相关矩阵进行变换,再用降秩迭代计算噪声子空间.在进行预白化时,提出一种利用训练序列估计色噪声协方差矩阵的方法,从而改善了盲信道估计收敛速度慢的缺点.仿真结果证明,系统的信道冲激响应可以被良好地跟踪.
一个基于数据挖掘的入侵检测系统模型
刘恒 等?
计算机科学 , 2003,
Abstract:
结膜吸吮线虫在终宿主体内发育过程及生殖机能的实验观察
王增贤,
动物学杂志 , 1993,
Abstract:
我国结膜吸吮线虫在是间宿主—变色纵眼果蝇体内发育过程的研究
王增贤,
动物学杂志 , 1993,
Abstract:
基于RANSAC+LS算法的红外成像全局运动设计
卓志敏,,
兵工学报 , 2008,
Abstract: ?提出了一种基于RANSAC+LS算法的红外成像全局运动估计方法。该算法的实现过程如下:首先对匹配块进行预检验;然后利用本文算法对尽可能多的内点进行运动参数估计;最后对参数估计结果利用双线性内插方法进行运动补偿。该算法计算速度快,比RANSAC算法利用了尽可能多的内点,并能克服LS算法易受错误匹配对和外点影响的缺点。利用对实际拍摄的红外图像实验表明,该算法计算精度高于RANSAC算法和LS算法。
陕西省年、月降水量的理论频数分布

高原气象 , 1983,
Abstract: 本文对陕西省年、月降水量频数进行了统计检验。检验结果表明:(1)年降水量遵从正态分布;(2)月降水量在做了立方根变换后,有83%的站月遵从正态分布;(3)月降水量中有58%的站遵从γ(Gamma)分布;(4)建议在估算月降水概率时,采用正态分布模型。
“后MOOC”时期在线教育三问

科技与出版 , 2015,
Abstract: 在线教育是一种通过信息通信技术来增长知识和技能的方式,近年来,随着互联网和视频通信技术的发展,在线教育如火如荼地开展,由MOOC延伸的各类应用模式正在实践,在线教育进入了“后MOOC”时代。从静态的共享资源逐步走向互动性的开放课堂,在线教育的理念和模式正在发生着重大的改变。本文从在线教育的目标和“后MOOC”时代的趋势切入,通过分析在线教育对传统教学三要素产生的影响,阐述在线教育平台的支撑基础,并展望未来在线教育的发展方向。
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