共查询到20条相似文献，搜索用时 390 毫秒
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本文研究了三元体系ＭｇＳＯ４—ＣＨ３ＣＯＮＨＣＯＮＨ２—Ｈ２Ｏ（Ⅰ）和Ｍｇ（ＮＯ３）２─ＣＨ３ＣＯＮＨＣＯＮＨ２—Ｈ２Ｏ（Ⅱ）在３０℃的相平衡，测定了饱和溶液溶解度及其折光指数，绘制了相应的溶度图和折光指数─组成关系图。两个体系均为简单共饱型。溶度曲线及折光指数曲线均由两支组成，分别与ＭｇＳＯ４·７Ｈ２Ｏ（Ⅰ）或Ｍｇ（ＮＯ２）２·６Ｈ２Ｏ（Ⅱ）和ＣＨ２ＣＯＮＨＣＯＮＨ２相对应。共饱点的组成分别为（Ⅰ）中ＭｇＳｏ４２７．３５％，ＣＨ３ＣＯＮＨＣＯＮＨ２ ４．７％；（Ⅰ）中Ｍｇ（ＮＯ３）２４２．７５％，ＣＨ３ＣＯＮＨＣＯＮＨ２１２．２４％。这项工作对开发缓释肥料具有重要意义。 相似文献
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为了研究南极水域的污染状况,于１９９３年１２月～１９９４年２月对南极麦克斯韦尔湾及邻近海域的高锰酸钾指数（ＣＯＤＭｎ）的变化和分布状况进行了监测。３９个站次的测值在０．３３４～１．９５９ｍｇ／Ｌ之间,符合中国《海水水质标准》（ＧＢ３０９７－８２）第一类水质（３．０００ｍｇ／Ｌ）要求。各考察站附近的测值高;长城湾内高于湾口及湾外。分析了湾内、湾口和湾外在１９９３年１２月、１９９４年１月及２月的变化情况和原因;对ＣＯＤＭｎ的主要来源进行了研究分析;并对南极长城站及邻近海域的环境保护和研究提出了建议。 相似文献
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本文研究了三元体系ＭｇＳｏ４－ＣＨ３ＣＯＮＨＣＯＮＨ２－Ｈ２Ｏ（Ｉ）和Ｍｇ（ＮＯ３）２－ＣＨ３ＣＯＮＨＣＯＮＨ２－Ｈ２Ｏ（Ⅱ）在３０℃的相平衡，测定了饱和溶液溶解及其折光指数，绘制了相应了溶度力和折光指数一组成关系图。两个体系为简单截饱型。溶度曲线及折光指数曲线均由两支组成，分别与ＭｇＳＯ４．７Ｈ２Ｏ（Ｉ）或Ｍｇ（ＮＯ２）２．６Ｈ２Ｏ和ＣＨ２ＣＯＮＨＣＯＮＨ２相对应。共饱点的组成分别为（Ｉ）中Ｍｇ 相似文献
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中国黄土高原东南部地区环境演变与远古人类文化研究 总被引：2，自引：0，他引：2
《地域研究与开发》1996,(Z1)
中国黄土高原东南部地区环境演变与远古人类文化研究ＡＳＴＵＤＹＯＮＥＮＶＩＲＯＮＭＥＮＴＥＶＯＬＵＴＩＯＮＡＲＹＡＮＤＰＡＬＥＯＨＵＭＡＮＣＵＬＴＵＲＥＩＮＳＯＵＴＨ－ＥＡＳＴＬＯＥＳＳＰＬＡＴＥＡＵＯＦＣＨＩＮＡ￥／／河南省文物考古研究所第一章 汾河... 相似文献
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《Urban geography》2013,34(3):258-278
An information theoretic model is used to compare the evolution of the spatial distribution of corporate headquarters in the United States during the period 1957- 1979 with an ideal time-space model. Dispersion of headquarters across the regions of the U.S. has been the dominant trend for most subsectors of the economy since the mid-1960s. Corporate concentration has been a compensatory trend that has left the overall system dispersion of headquarter location at a stable and unchanging level for the country as a whole. 相似文献
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THE TIMES OF P, S AND SKS, AND THE VELOCITIES OF P AND S 总被引：3，自引：0，他引：3
《Geophysical Journal International》1939,4(7):498-533
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DAVID LOWENTHAL 《Geographical review》2007,97(2):202-229
ABSTRACT. Geography, experience, and imagination are all crucial to how we take measure of islands. Prime foci of legend and invention, islands have haunted humanity since the dawn of history. Why are they so intensely loved and loathed, desired and rejected, minutely scrutinized yet often perilously misjudged? On islands we feel alternately landed and adrift, magnified and reduced, fulfilled and voided, at home and in exile. These and other polarities are reviewed here with examples from Caribbean, Atlantic, Mediterranean, antipodean, and imaginary islands fancied by the creator. 相似文献
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Don W. Duckson 《The Professional geographer》1981,33(3):361-365
Three samples of twenty drainage basins were analyzed to test the hypothesis that the generic terms “creeks,'’“runs,'’and “hollows'’connote streams of different size and velocity. Analysis of variance and Scheffé's test indicate the validity of a perceptual hierarchy among generics. It is suggested that other hierarchies may exist among geographically named features. 相似文献
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MAPS,GEOGRAPHY, AND GEOGRAPHERS 总被引：1，自引：1，他引：0
John R. Borchert 《The Professional geographer》1987,39(4):387-389
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ABSTRACT. The search for a perfected place on earth is rarely easy or forgiving. Utopias and dystopias demonstrate the practical frailties of attempts to build better human associations, whether as literary efforts or in actual, on‐the‐ground experiments. With a proprietary interest in evaluating the dimensions of place making, geographers can lay claim to be frontline critics of efforts that attempt to craft a better world. The catalog of personality cultists, charismatically murderous leaders, and apocalyptic mass death is long. The Church Universal and Triumphant, currently of Paradise Valley, Montana, is examined as the home for twenty‐five years of an ongoing effort to “improve” lives. If its dilemmas and apparent failures are in keeping with the history of past utopian ventures, geographical lessons remain to be learned about the costs of planning for perfection. 相似文献
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