我们需要一门新地图学吗?

“新地图学”是近年来国际地图学者们议论的一个热点。本文提出了另一种观点,代表了另一部分学者意见。本文作者现任西德地图学协会主席,在1987年墨西哥ICA国际学术讨论会上,由作者本人宣读了该文。     

四十年的光辉历程──武汉测绘科技大学发展点滴

四十年的光辉历程──武汉测绘科技大学发展点滴罗丁四十年的光辉历程一则令人鼓舞的报道１９９６年９月２８日，长江日报载有这样一条消息：占地面积不足５０万平方米，在校师生仅６０００余人的武汉测绘科技大学（以下简称武测），昨日通过国家测绘局组织的“２１１工程...     

Use of fluorescein as a ground water tracer in brackish water aquifers

A drift and pumpback experiment was conducted in a brackish water sandfill. The sandfill was reclaimed from the sea in the eastern part of Singapore and contains sands with low organic and clay/silt contents. The high salinity in the ground water precludes the use of chloride and bromide as tracers in such an environment, and a field experiment was conducted to assess the viability of using fluorescein as a tracer in brackish water aquifers. Nitrate was used as a second tracer to serve as a check. Initial laboratory studies showed that fluorescence was unaffected over the range of electrical conductivity and pH of the ground water. Results from the field experiment show that fluorescein appears to behave conservatively.     

用气液混合剂钻进常年冻结层

采用气液混合剂清洗孔底的钻进方法广泛应用于地质勘探工程施工.尤其是在复杂矿山地质条件下,剖面上出现裂隙、洞穴和再沉积岩层而产生不同程度冲洗液漏失的孔殴以及常年冻结地层分布地区,使用气液混合剂钻进更为有效.     

一个外国人看中国地图学教育——中国的高等地图学教育

一个外国人看中国地图学教育──中国的高等地图学教育［俄］Ａ．Ｍ．Ｂｅｒｌｙａｎｔ编者按：俄国莫斯科大学教授Ａ．Ｍ．Ｂｅｒｌｙｓｎｔ在访问武测科大和南京大学等单位后，写成此文。从一个侧面反映了我国地图学教育的成就。译文中个别字句稍有删节。地图学在中国源...     

Historical polycyclic aromatic and petrogenic hydrocarbon loading in Northern Central Gulf of Mexico shelf sediments

The distribution of selected hydrocarbons within ten dated sediment cores taken from the Mississippi River Bight off coastal Louisiana suggests a chronic contaminant loading from several sources including the river itself, oil and gas exploration in the central Gulf of Mexico (GOM) shelf area, and natural geologic hydrocarbon seeps. Data were grouped as either total polycyclic aromatic hydrocarbons (PAH's), which were indicative of pyrogenic PAH's; or estimated total hopanes (indicative of petrogenic hydrocarbons). The total PAH concentrations and estimated total hopanes begin increasing above background levels (approximately 200 ng g(-1)) after the 1950s. The distribution of these hydrocarbons and hopanes within the dated sediment cores suggests that the Mississippi River is a regional source of pyrogenic PAH's, and that the hopanes are from natural geologic hydrocarbon seeps, oil and gas exploration in the GOM, or both.