河南省地域旅游系统分析   总被引：4，自引：0，他引：4  

王庆生  陈一静  胡默言 《地域研究与开发》2005,24(4):92-95

文章以地域旅游系统理论为基础,对河南省地域旅游系统进行初步的分析研究,旨在为以后河南省旅游产业可持续发展提供基本背景认识;同时,也为分析其它不同地域旅游产业发展提供一种研究途径。  相似文献   

Bacterial transport experiments in fractured crystalline bedrock   总被引：5，自引：0，他引：5  

Becker MW  Metge DW  Collins SA  Shapiro AM  Harvey RW 《Ground water》2003,41(5):682-689

The efficiency of contaminant biodegradation in ground water depends, in part, on the transport properties of the degrading bacteria. Few data exist concerning the transport of bacteria in saturated bedrock, particularly at the field scale. Bacteria and microsphere tracer experiments were conducted in a fractured crystalline bedrock under forced-gradient conditions over a distance of 36 m. Bacteria isolated from the local ground water were chosen on the basis of physicochemical and physiological differences (shape, cell-wall type, motility), and were differentially stained so that their transport behavior could be compared. No two bacterial strains transported in an identical manner, and microspheres produced distinctly different breakthrough curves than bacteria. Although there was insufficient control in this field experiment to completely separate the effects of bacteria shape, reaction to Gram staining, cell size, and motility on transport efficiency, it was observed that (1) the nonmotile, mutant strain exhibited better fractional recovery than the motile parent strain; (2) Gram-negative rod-shaped bacteria exhibited higher fractional recovery relative to the Gram-positive rod-shaped strain of similar size; and (3) coccoidal (spherical-shaped) bacteria transported better than all but one strain of the rod-shaped bacteria. The field experiment must be interpreted in the context of the specific bacterial strains and ground water environment in which they were conducted, but experimental results suggest that minor differences in the physical properties of bacteria can lead to major differences in transport behavior at the field scale.  相似文献   

致密天然裂缝性气藏布水平井的（经济）评价     

Zamm.  AM 吴锦莲 《国外石油地质》1992,(2):78-88

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矿业工程地质问题     

Γ.  AM 唐文敏 《国外煤田地质》1992,(3):45-50

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CO2—CH4与CO2—N2二元体系的等容相图：在流体包裹...     

DenK.  AM 陈卉泉 《地质地球化学》1992,(1):90-98

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萨斯喀彻温省里贾纳深井地热观测     

Jess.  AM 满开言 《地震地质译丛》1991,13(4):52-60

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碲化物,硫化物及氧化物之间的相关系：：I.热化学资料与计算的平衡     

Afifi  AM 崔艳合 《国外矿床地质》1991,(2):15-31

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服务地理学的前景     

P.W.Daniels  王庆生  杨延哲  浦光梁 《地理科学进展》1992,11(4):15-19

一、需要继续向劳务生产转移吗?发达的经济结构仍需完成从商品生产到服务生产的转移过程。截至1990年1月,美国制造业(包括建筑业)的就业水平比1980年降低了3%,(100万人),而服务业的就业率却增加了3%,(2000万人)。  相似文献   

论农业投资效益研究     

王庆生 《地域研究与开发》1992,11(2):12-15

文章首先论述了农业投资效益研究的核心内容,农业投资的变化特点:其次探讨了优化农业投资分配结构的原则及农业投资模式的建立;最后讨论了农业投资效益研究的基本方法等问题。  相似文献   

遵义苟江铝土矿区水井坎矿段铝土矿成矿化学组分演化序列及成矿阶段的划分   总被引：2，自引：0，他引：2  

时中越  王庆生 《贵州地质》1992,9(1):1-8

本文对水井坎矿段矿床地质特征作了深入研究的基础上，联系有关各时期构造运动，划出了该矿段铝土矿形成过程中的六个成矿阶段，并叙述了各阶段的主要成矿作用，同时总结出成矿过程中的化学组分演化序列。  相似文献