遥感技术与美国的人口普查

引言 D.布鲁金尼的论文《可用空间时代技术进行更精确的人口普查》提出了一些有趣的问题。我们为能够在《摄影测量工程和遥感》杂志上看到这篇有关遥感在社会科学领城内的应用的论文而高兴。我们认为只有了解人口普查数据的多种用途之后,再来检验那些改进人口普查的方法才是合适的,众所周知,每十年一次的人口普查数据的精度和完备性并不是没有缺点的。无疑地,许多人口普查人员将首先承认,每次由点数     

几株有益芽孢杆菌对温度、制粒工艺及pH值的耐受性

报道了实验室分离、筛选的5株有益芽孢杆菌对温度、对虾饲料制粒工艺流程和pH值的耐受性。结果表明，5株芽孢杆菌经80℃水浴40min后全部存活，90℃水浴20min有35％-70％存活，100℃水浴10min仍有30％-50％存活，显示所筛选的5株芽孢杆菌对高温有较强的耐受力；在对虾饲料中添加5株芽孢杆菌，经整个生产工艺流程后芽孢杆菌存活95％，烘干后芽孢杆菌存活93％，说明杆菌能够承受饲料制粒生产中压力、温度和水分的变化；当pH值为3．8、4．6、5．2时，分别有l、3、5株菌能繁殖，pH值6．0-8．5时，5株菌生长旺盛，将5株菌经pH值2．2—4．6处理1h，再接种在pH值7．2的培养基可以良好生长，说明杆菌在酸性环境中生长性能较差，在弱酸性和碱性环境中生长旺盛；能耐受酸性环境而存活，再给予适宜环境即能良好生长。5株芽孢杆菌具有作为水产硬颗粒饲料专用益生素菌株的优势。     

含平流（avdection）的热单温吸积流的径向结构

本在小粘滞参数，低吸积率的条件下，借助含平流的热吸积流的自相似解，考虑非热正负电子对产生，采用分两个区域分别求妥然后对接的方法，研究了含平流的热单温吸积流的径向结构。证实了热吸积流所具有的一些显特征和基本性质，同时得到一些新的结果：含平流的热吸积流存在一个临界半径ｒＣｒ；明确指 出含平流的热吸积流的辐射冷却率与中心天体的质量成平方反比关系；提出正负电子对过程对含平流的热吸积流的辐射过程有显影     

11颗类星体光谱(英文)

对天区0112-35的UKST物端棱镜底片上的11个类星体候选者进行了光谱观测,证实为类星体,给出了它们的红移值、证认图及光谱图。11个类星体中有6个属于角距小于4角分的3对类星体;1个类星体-星系对。     

美国地貌学情况综述

我们根据地貌工作者和第四纪地质学工作的人数、专业团体会员人数及其有关出版物等情况对美国地貌学家的活动状况做一个综述。美国的地貌学出现于19世纪末期。当时的地质学和地理学还紧密联系在一起的。当地理学成为一个独立学科时,其成员主要是自然地理学家和学过地质学的地貌学工作者。在本世纪30年代期间,地理学家们反对环境决定论的模式,地貌学的重要性有所下降。     

Heterodyne spectroscopy of the 158 micron C II line in M42

We have obtained velocity-resolved spectra of the 12C II 157.8 microns 2P3/2-2P1/2 fine structure line in the M42 region of Orion. Observations at 0.8 km s-1 resolution with a laser heterodyne spectrometer show multiple velocity components in some locations, with typical linewidths of 3-5 km s-1. Spectra of theta 1C and BN-KL also show weak emission from the F = 2-1 hyperfine component of the equivalent 13C II line. From the observed 12C II/13C II line intensity ratios, we deduce that the 12C II emission is optically thick with tau approximately 5 at both positions. Excitation temperatures of 128 K and 90 K, together with column densities of approximately 1 x 10(19) cm-2 and approximately 4 x 10(18) cm-2, are derived for theta 1C and BN-KL, respectively.     

Variations in the HCN/HNC abundance ratio in the Orion molecular cloud

We have used observations of the rare isotopes of HCN and HNC to determine the relative abundance of these two chemical isomers along the central ridge of the Orion molecular cloud. The abundance ratio [HCN]/[HNC] decreases by more than an order of magnitude from the relatively warm plateau and hot core sources toward the KL nebula to the colder, more quiescent clouds to the north and south. Even in the cooler regions, however, the ratio is an order of magnitude larger than that found in previous investigations of cold dark clouds. We determine the kinetic temperature in the regions we have studied from new observations of methylacetylene (CH3CCH), together with other recent estimates of the gas temperature near KL. The results suggest that the warmer portions of the cloud are dominated by different chemical pathways than those in the general interstellar cloud material.     

Population development in Greater Santiago between 1970 and 1982: an analysis of district census results

"An attempt is made in the light of an analysis of population changes occurring in several sub-districts of Greater Santiago in the period between the last population censuses of 1970 and 1982, based on small-area census units (distritos and communas) to draw attention to the effects on the spatial growth of the city resulting from changed conditions in the political and juridical sphere since the change of power in 1973." The effect of changes in government policy concerning the liberalization of the property market and the illegal occupation of land are noted. (summary in ENG)     

金川镍铜矿床数学模型对深部矿化变化趋势的指示

按矿化特征将金川X矿区主矿体分为致密块状特富矿、海绵状富矿和浸染状贫矿.应用MicroMine软件对3类矿化体分别建立了数学模型,并应用距离平方反比法对模型单元块进行了镍、铜品位估值.通过分析和对比矿床数学模型900m至1300m不同水平剖面上的Ni、Cu品位及Ni/Cu比值的变化,得出在X矿区的中部西侧是一个Ni和Cu的矿化中心,并且向深部Cu的矿化强度高于Ni.     

延边东部五道沟岩群的单颗粒锆石SHRIMP U-Pb 年代学及其地质意义

通过对延边地区东部五道沟岩群黑云阳起石片岩的单颗粒锆石SHRIMP U-Pb年龄测定.获得21个单点年龄,其中包括7组谐和年龄和1组不谐和年龄.谐和年龄分别为1347.8 Ma、844.8 Ma、340.2～313.7 Ma(平均值为323±23 Ma,N=4,MSWD=0.23,置信度=0.88)、292.9～288.3 Ma(平均值=291±25 Ma,N=3,MSWD=0.031.置信度=0.86)、279.2～266.2 Ma(平均值为279±28 Ma,N=4,MSWD=0.031,置信度=0.86)、127.4～124.2 Ma(206Pb/208U年龄平均值为126.5±3.7 Ma,N=5,MSWD=0.12;置信度=O.97)、116.1～106.3 Ma(平均值为115±39 Ma,N=2,MSWD=1.2置信度=0.27),不谐和年龄的下交点年龄为(451±120)Ma、上交点年龄为(1811±400)Ma(MSWD=7.2);这一结果表明:阳起石片岩的原岩主要是来自中元古代、新元古代和早古生代的碎屑物,指示五道沟群的沉积成岩作用发生在石炭世(323±23 Ma),变质作用发生在晚二叠世(291±25 Ma),之后在279.2～266.2 Ma、126.5～106.3 Ma先后受两次岩浆用和蚀变作用的改造.