A spatial analysis of factors relating to family planning in Thailand

This paper focuses on whether there is an organized structural pattern in the spatial distribution of oral contraceptive usage in rural Thailand and, if so, how this spatial pattern is linked to other related socioeconomic variables. The data concern the year 1975. The results suggest that the location of the health services infrastructure seems to have the most significant effect on the differences in level of oral contraceptive use observed.     

南海輓近海平面变化与构造升降初步研究

揭示南海輓近海平面变动和古岸线诸多遗迹,探讨晚更新世以来海平面变化一般规律,初步分析南海周缘中全新世和现代地壳构造升降速率,得出本区海平面上升率适中参考值为0.10—2.0mm/a,初步估算未来50年内海平面变化趋势在1.26—4.0mm/a之间;而构造升降受块断差异运动控制,一般规律是南海北部沿岸自东向西递减,由福建南部1.15mm/a至海南岛南部0.54mm/a。近代地壳形变资料亦证实这种变化规律。     

华南沿海海滩岩与第四纪环境研讨会在汕头召开

由广东省地质学会、广东省地震学会和地理学会联合主办的“华南沿海海滩岩与第四纪环境研讨会“于1988年1月21日至24日在广东省汕头市召开。出席大会有来自全国各地12个单位32名专家和代表。会议收到论文摘要24篇,我所刘以宣、朱袁智、陈欣树、潘新虎、李赶先等参加了这次会议。刘以宣,朱袁智在会上宣读了论文,提出对东南沿海全新世碳酸盐胶结碎屑岩的划分与广澳风坡积碎屑岩的成因等新观点,受到与会代表的重视。     

Large urban agglomerations of the Soviet Union

The study of urban agglomerations in the USSR is discussed, with a focus on their basic framework and role in settlement and on the various techniques used to define such agglomerations. "The present paper envisages a minimum population of 250,000 for the core city (or cities), maximum travel time of 1.5 to 2 hours to the core city, and a minimum value for a 'development coefficient' reflecting the population of the agglomeration and its structure in terms of urban places. The networks of agglomerations that existed at the time of the 1959 and 1970 censuses are analyzed and compared. The urban agglomerations are grouped into five classes of development levels and into three classes of growth rates. Intensive and extensive growth factors are discussed."     

华南海岸沙坝瀉湖型潮汐汊道口门地貌演变

华南海岸沙坝湖型潮汐汊道主要分布在小潮差岬湾海岸段。汊道口门基本地貌单元有口门深槽、落潮三角洲、涨潮三角洲、内弯沙嘴等，其形态特征与海岸动力及泥沙条件有关。汊道口门迁移、落潮主水道迁移、冲流坝和水道边缘坝向岸迁移和并岸，是汊道口门地貌演变的主要模式并具周期性特点。　湖港湾大规模围垦堵海或注入港湾的河流改道直接入海，这些人类活动可能导致汊道口门急剧变化和航行条件恶化而必须进行整治。     

Hydrologic significance of carbon monoxide concentrations in ground water

Dissolved carbon monoxide (CO) is present in ground water produced from a variety of aquifer systems at concentrations ranging from 0.2 to 20 nanomoles per liter (0.0056 to 0.56 microg/L). In two shallow aquifers, one an unconsolidated coastal plain aquifer in Kings Bay, Georgia, and the other a fractured-bedrock aquifer in West Trenton, New Jersey, long-term monitoring showed that CO concentrations varied over time by as much as a factor of 10. Field and laboratory evidence suggests that the delivery of dissolved oxygen to the soil zone and underlying aquifers by periodic recharge events stimulates oxic metabolism and produces transiently high CO concentrations. In between recharge events, the aquifers become anoxic and more substrate limited, CO is consumed as a carbon source, and CO concentrations decrease. According to this model, CO concentrations provide a transient record of oxic metabolism affecting ground water systems after dissolved oxygen has been fully consumed. Because the delivery of oxygen affects the fate and transport of natural and anthropogenic contaminants in ground water, CO concentration changes may be useful for identifying predominantly anoxic ground water systems subject to periodic oxic or microaerophilic conditions.