单板计算机用于污水流量的自动计量

本文介绍由单板计算机作为潜入式电磁型污水流量的自动计量装置。它在程序控制下,能够完成A/D转换、计时、流量的运算和累计、显示时间和流量、定时打印时间(星期、小时)和累计流量值,超量程报警和量程变换等攻能。具有精度高、稳定可靠、能在无人值守的情况下,自动计量和记录等优点。由潜入式电磁流量计和本装置构成的污水测试系统于1984年12月末通过市科委组织的技术鉴定。到会专家一致认为整个系统达到国内先进水平。     

合成氨工艺气─空气体系静态爆炸的表观实验特性

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...     

富拉尔基区环境空气污染状况评价

本文就富拉尔基环境空气污染状况进行评价分析,以便于今后有针对性的管理.     

白皎矿矿井水的处理与利用

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