大功率激发极化法及其在铜矿的应用

大功率激发极化法具有发射功率大,供电电流强的特点,可以压制各种干扰信号,提高信噪比。在近年来的金属矿产勘查中,特别是在寻找隐伏矿和深部矿的新一轮找矿中,激电方法发挥了重要作用并取得了良好的找矿效果。文章在深入理解激发极化法物理机制的基础上,探究了激发极化法的基本原理和方法,主要包括频率特性与时间特性的关系、激发极化法的常用装置原理和激发极化法资料解释方法。在此基础上,分析了工区的地质及地球物理特征,野外工作的测网布设、工作方法及采集数据的质量评价。深入地研究了激电测深二维反演方法,并且处理效果较好。最后,对处理结果进行了详尽的推断解释,并在成矿的有利位置进行了钻孔验证。     

长三角和京津冀区域金融一体化分析：信贷的扩散与极化

长三角和京津冀是中国经济发展水平较高的跨区域规划经济体。采用信贷增长率指标构建 SVAR模型对两地金融一体化程度进行分析比较。协整结果显示两大区域内信贷存在长期稳定的均衡关系,金融一体化效应明显。长三角一体化程度高于京津冀,京津冀中天津信贷扩散效应显著,北京和河北信贷呈现极化效应。     

国家高新区创新能力空间极化及变动趋势研究

在我国高新区逐步在区域经济发展中起关键支撑作用,而技术创新软环境建设滞后的背景下,本文选取2007-2013年国家高新区省域层面的4项创新能力指标数据,构建国家高新区创新能力强弱指数,并运用泰尔指数以及基尼系数测度国家高新区创新能力空间极化趋势。同时运用??收敛和??收敛方法分析国家高新区创新能力空间极化的变动趋势,结果表明7年间国家高新区创新能力的省域极化效应呈现波动上升趋势。     

Segregation,Social Polarization and Immigration in Athens during the 1990s: Theoretical Expectations and Contextual Difference

This article investigates trends in segregation, polarization and inequality in Athens during the 1990s, and focuses on what may seem a paradoxical coexistence of decreasing segregation with increasing social polarization and inequality. To explain this coexistence, the article examines the distinction between social polarization in specific contexts and the dominant assumptions about social polarization, which derive from the global city thesis, and the structure of the city's housing market, which prevented the substantial wave of immigration during the 1990s from intensifying segregation. Arguing for more context awareness, the article does not try to stress the specificity of the Athenian case, but, mainly, to reveal the context‐dependent character of the dominant assumptions about segregation and social polarization and, therefore, to show their limitations.     

一种新型宽波束圆极化天线的设计

本文提出了一种新型的螺旋结构的天线，将角锥螺旋与四臂螺旋的结构巧妙的结合起来，并采用了自相移结构及渐进式的平衡馈电，经有限元法对其辐射特性进行分析和实测，结果都说明该种天线在实现宽波束圆极化的同时展宽了频带，且结构简单。     

网络民意将走向何方

信息时代的到来,网络民意这把双刃剑发挥着越来越大的作用。加强网络立法与监管,提高网民素质是引导网络民意走向理性的必经之路。     

城市规划在遏制贫富分区中的作用

认为我国城市的贫富分化、贫富分区已经成为严重的社会问题;贫富分区是贫富分化在空间上的投影,它凸显了社会的不公,导致了城市空间的排斥,加剧了社会各阶层之间的对立,不利于社会主义和谐社会的建设。鉴于此,分析了贫富分区形成的机制及其影响,并从城市规划的角度,针对如何控制城市贫富分区,提出了相关意见和建议。     

激电法勘探在某矿区铅锌矿普查的应用

此前已基本完成了地质预查工作,通过预查圈定了Au、Pb、Zn化探异常,经探槽和钻孔揭露在XX矿区地段已发现了具有一定规模的铅锌工业矿体和金矿体,所以转入普查工作。本文通过激电中梯和大功率激电测深工作,发现并圈定激电异常,提供寻找铅锌矿的靶区或靶位,为进一步开展铅锌矿找矿工作提供基础资料和依据。     

Entanglements of Periphery and Informality in Mexico City

Mexico City is a well‐known case of urban expansion. Most of the growth has been in its peripheries, occurring during two phases of housing privatization: a predominantly self‐built urbanization by residents establishing irregular settlements (starting in the 1930s); and a relatively recent surge of mass‐produced small‐scale single‐family housing built by state‐sponsored development companies (underway since the year 2000). Informality, we argue, should not be understood as a mode of housing production setting in opposition self‐build practices against industry‐led and/or state‐sponsored processes, but rather as a dialectical urbanization logic shaped by the entanglements of in/formal processes in governance practices, land privatization and regularization, and urban infrastructure and services deficits. We are particularly interested in a dominant narrative whereby the embeddedness of informality is constantly underplayed and irregular settlements are cast as a residual category, a problem to tolerate or in need of intervention, or the inevitable combination of demographic growth and housing shortage, rather than the direct outcome of urban policies and development processes. Conversely, recent housing policy in Mexico is officially narrated as an economic stimulus, a means to control and order (irregular) urban expansion, and an impulse to democratize homeownership. Our discussion of the entanglements of informality in Mexico City is based on an extended literature review of academic articles and official reports (predominantly in English), supplemented by a series of street and neighborhood explorations (in the summers of 2012 and 2013) across the metropolis.     

激发极化法在寻找金矿中的应用研究

近几十年来,近地表金矿资源近乎被开发殆尽,寻找深部隐伏金矿已经成为近年来金矿勘探中的重点方向。利用激发极化法能够较准确的预测深部隐伏矿体的存在。特别是金矿大多数与金属硫化物伴生,硫化物通常是黄铁矿或毒砂,偶尔也有磁黄铁矿,使用激发极化法测量这些伴生矿的物理场特征,结合地学理论就可以间接找出金矿。