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合成氨工艺气─空气体系静态爆炸的表观实验特性青海大学丁锁根青海第一化肥厂胡德福合成氨工艺气体的主要成分为Ｈ２、Ｎ２、ＣＯ、ＣＯ２和ＣＨ４等组分。其中Ｈ２、ＣＯ、ＣＨ４属于可燃煤气体。当它们各自与空气以适当的比例混合，将组成爆炸性混合气，遇到链引发条件...     

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本文主要介绍了白皎矿矿井水的处理方法和上艺,处理后矿井水除硫酸盐外,其余指标均达到国家生活饮用水卫生标准,缓解了煤矿生产和生活用水紧张的状况,同时还保护了环境。经济、社会、环境效益良好。     

The modern theory of biological evolution: an expanded synthesis

In 1858, two naturalists, Charles Darwin and Alfred Russel Wallace, independently proposed natural selection as the basic mechanism responsible for the origin of new phenotypic variants and, ultimately, new species. A large body of evidence for this hypothesis was published in Darwins Origin of Species one year later, the appearance of which provoked other leading scientists like August Weismann to adopt and amplify Darwins perspective. Weismanns neo-Darwinian theory of evolution was further elaborated, most notably in a series of books by Theodosius Dobzhansky, Ernst Mayr, Julian Huxley and others. In this article we first summarize the history of life on Earth and provide recent evidence demonstrating that Darwins dilemma (the apparent missing Precambrian record of life) has been resolved. Next, the historical development and structure of the modern synthesis is described within the context of the following topics: paleobiology and rates of evolution, mass extinctions and species selection, macroevolution and punctuated equilibrium, sexual reproduction and recombination, sexual selection and altruism, endosymbiosis and eukaryotic cell evolution, evolutionary developmental biology, phenotypic plasticity, epigenetic inheritance and molecular evolution, experimental bacterial evolution, and computer simulations (in silico evolution of digital organisms). In addition, we discuss the expansion of the modern synthesis, embracing all branches of scientific disciplines. It is concluded that the basic tenets of the synthetic theory have survived, but in modified form. These sub-theories require continued elaboration, particularly in light of molecular biology, to answer open-ended questions concerning the mechanisms of evolution in all five kingdoms of life.Dedicated to Prof. Dr. Dr. hc mult. Ernst Mayr on the occasion of his 100th birthdayThis revised version was published online in March 2004, with corrections to the caption of Figure 6.     

黄浦江水面污染

一、概况 黄浦江,从吴淞河圹灯桩至闵行电厂上游边界渠槽港止,计长66.6公里。两岸有上海港务管理局韵装卸区十二个,码头泊位96个,浮筒泊位84个,以及货主码头86个。沿江工厂81个,船厂、航修站46个。66.6公里的黄浦江,港务局占用岸线百分之十五,空余岸线20几公里;其余岸线均为沿江工厂、货主码头所占用。     

加强环境管理节约水资源

陕西省威阳市注意加强对地下水资源的管理,杜绝以往地下水盲目开凿,水资源浪费严重的现象,去年建立了各项制度,在节约用水方面做出显著成绩。去年和81年比较,节约用水量630万吨,所节水量相当于咸阳市市区自来水公司全年开采量的一半;仅这一项即可节约用电220.5万度,节约水资源费折合人民币25.2万元,为保护地下水资源,减轻环境污染,作了有益的工作。近几年来,咸阳市的工业生产发展较快,用水量亦与日俱增。过去,由于无一套行之有效的管理办法,企业单位盲目开凿,超量用水的现象日趋严重,致使咸阳     

百万雄鸡过大江——隆政镇生态建设之路

隆政镇地处里下河平原,位于江苏省海安县西北,是以种植业为主的农村乡镇。全镇人口2.3万,耕地面积2.85万亩、水面面积0.31万亩,人多地少,粮食产量不高,1983年人均收入只有215元,在海安县属于贫困乡镇。 1983年以来,隆政镇（原为乡）镇政府按照海安县“在里下河地区继续抓好粮棉生产的同时,大力发展养禽业和淡水养殖业”的农业结构调整政策下,结合当地传统养鸡、养猪的优势,作出了以“养殖业为突破口,发展加工业,大力发展农村经济”的战略决策,并从养殖业入手,带动饲料加工业,充分利用农副产品废弃物和非粮资源,化废为宝,促进资源的多层次利用,实现了生态与经济的良性协调发展。 几年来,隆政镇工农业总产值平均每年以17.1％的速度递增,目前该镇粮食年产量达3000万千克,国民总收入3370万元,工农业总产值8807万元（其中农业产值5111万元）,生猪饲养量近30万头,家禽饲养量愈190万羽,镇办及村办企业18个,人均年收入1000元以上,成为里下河地区较富裕的乡镇之一。