城市历史街区街巷空间的改造——以成都市宽窄巷子为例

随着经济的发展,人们的物质生活逐渐丰裕,对精神生活的要求也变得丰富,人们开始寻找历史的记忆点。在这个背景下,城市历史街区面临着巨大的挑战。一方面由于基础设施等的落后,历史街区暴露出很多社会问题,无法满足人们的日常需要;另一方面,它们是城市历史的记忆点,是人们认知城市的媒介。城市历史街区的改造是一把双刃剑,既要延续城市的文脉,又要给该地区带来经济效益,实现可持续发展。宽窄巷子作为历史街区改造较成功的案例,文章着重阐述了其在进行街巷空间的改造时,所用到的两种方法及其他们之间所呈现出来的关系。     

辽河断陷齐3-17-5块莲花油层储层“四性”关系研究

辽河断陷齐3-17-5块莲花油层储层主要为湖底扇相沉积,通过对取心井的岩性统计分析,研究区储层主要以砂砾岩、粗砂岩、中砂岩、细砂岩及粉砂岩等为主。通过对该段储层测井、录井、岩心和试油等资料的收集、整理、校正、分析,开展了储层特性和油水层解释标准研究,总结出该地区储层的四性关系,并建立了储层油、气、水、干层的解释标准及解释图版,确定出油层的有效厚度下限标准,为储层参数模型建立和油气层识别打下了坚实的基础。     

对管道穿楼板套管设置规定的探讨

对《建筑给水排水及采暖工程施工质量验收规范》"基本规定"中的设置管道金属或塑料套管的规定进行探讨;分析了何时设置什么样的套管;并应该如何进行封堵。     

消防水幕系统的研究现状概述

本文基于目前国内外专家对于消防水幕的研究成果,介绍了不同因素对消防水幕衰减辐射热、阻隔有毒有害气体等方面能力的影响规律,分析了消防水幕在工程中应用的可行性和存在的优缺点,希望以此为消防水幕系统的设计与研究提供参考。     

地区间产业融合有利于缩小区域经济差异吗？——兼析中国地区间产业融合网络及其结构演变

区域发展不平衡的问题需要通过加强地区间的经济联系来解决,地区间的产业融合在发挥各地区比较优势促进整体经济发展的同时,也会通过一体化的产业体系促进区域经济差异的缩小。基于中间品投入产出关系设计地区间产业融合水平评价指标,并采用2002年、2007年和2012年《中国区域间投入产出表》的数据,以30个省级区域为地区单元构建地区间产业融合网络,分析表明：在样本期间,中国的地区间产业融合网络格局处于动态演进中,在总体水平显著提高的同时也存在地区发展的不平衡,部分地区与其他地区的产业融合水平有待提升;中国的地区间产业融合网络具有与地理位置相关的板块特征,地理因素对地区间产业融合具有重要影响。进一步运用QAP回归方法分析地区间产业融合水平变化对经济发展水平差异变化的影响,结果表明地区间产业融合水平的提升有利于区域经济差异的缩小。因此,应积极深化社会主义市场经济体制改革,促进地区间市场和产业的一体化发展,并通过加快数字经济发展和基础设施建设等弱化地理因素对地区间产业融合的制约,进而提升地区间产业融合水平并优化其网络结构;在提高地区间产业融合发展水平的同时,也要积极缩小地区间资本积累、产业结构等方面的差异,以更有效地促进区域经济差异缩小。     

苏里格气田苏54区块气水分布特征分析

在地层水化学分析、气水层的识别的基础上,对苏里格气田苏54区块气水的分布特征及分布规律开展深入研究。区块东部基本不产水,其余区域均有地层水的存在,并且在一定程度上具有连片分布的特征。2012年在东部筛选不产水的区域集中,Ⅰ+Ⅱ类井比例达到72.0%,平均无阻流量10.6×104m3/d,2口水平井试气均达百万方,开发效果良好。     

POI数据辅助下的泸州市城市地块用地类型现状快速判断与验证

［目的］土地利用规划和城市规划的用地地块,在实际使用过程中,都会不同程度与规划用途产生差异,如何把握规划的实施程度是土地管理中的一个重要问题。［方法］在大数据时代的背景下,通过对网络大数据可以真实地反映城市地块的真实使用状况。研究采用OSM（Open Street Map）,对研究区进行城市地块的划分,形成街区尺度的城市地块。采用POI（Point of Interest）数据,建立了POI分类与城市用地分类的映射关系,计算了不同类型的POI数据的频数密度和类型比例,形成基于POI的城市地块用地类型识别方法,对研究区的城市地块进行土地利用现状识别。识别结果与第二次土地调查分类结果进行对比,验证方法的可行性。［结果］从泸州市的实证结果看,基于POI数据的城市地块识别结果与基于地籍数据的城市地块识别结果存在很大的差别。地籍数据主要是表针城市地块中不同实体的土地利用状况,两种数据采集的标准和表达的意义都不同,因此造成结果存在较大的差异性。［结论］研究认为,POI点有准确的空间位置信息和丰富的属性信息,主要是表征城市地块中不同实体的真实使用状况,可以较准确地判定快速发展的城市进程中的城市用地类型,能较为真实反映城市地块的现实使用状况,但也要注意POI数据在实际应用中存在的缺陷和不足。     

Bootstrapping cointegrating regressions

The paper investigates the usefulness of bootstrap methods for small sample inference in cointegrating regression models. It discusses the standard bootstrap, the recursive bootstrap, the moving block bootstrap and the stationary bootstrap methods. Some guidelines for bootstrap data generation and test statistics to consider are provided and some simulation evidence presented suggests that the bootstrap methods, when properly implemented, can provide significant improvement over asymptotic inference.     

The Role of Pension Business Benefits in Institutional Block Ownership and Corporate Governance*

We investigate whether potential pension contracting benefits lead institutions that provide pension services to acquire ownership blocks in firms and the implications of such blockholdings on the firms' corporate governance. We use the 2006 Pension Protection Act, which expanded pension participation in certain states, as a quasi-exogenous shock and find an increase in block ownership by pension-providing institutions in firms with substantial operations in affected states. Further, we find that the acquisition of a large block increases the likelihood that the institution will provide future pension services to the firm. With regard to corporate governance, we find that the acquisition of large pension blockholdings is associated with higher CEO pay and lower CEO turnover following poor financial performance. However, contrary to the prediction of the private benefits hypothesis, we do not find consistent evidence that large pension blockholdings are associated with declining firm profitability, suggesting that pension institutions are incentivized to exert monitoring to preserve the investment value of their blockholdings. Overall, our evidence is consistent with pension service institutions acquiring ownership blocks to obtain pension contracts, but our evidence does not support the prediction that they use their influence to compromise shareholder value.     

Further empirical evidence on block transactions below the MBR: the Spanish market

There is a relatively unknown market for partial control or corporate influence in Spanish listed firms, where the control transaction size is below the legal threshold that triggers a mandatory tender offer, as this kind of deal looks for exercising some degree of control, but not a full control. The goal of this paper is to go further in its empirical analysis by exploring its distinguishing features, using as the criterion to define its transactions obtaining a seat in the board of directors. We find that these deals are mainly located in the segment of the market of large trades where the rules for private negotiations are easier to implement; the size of the block is relatively large and it is negotiated as a whole block. Besides, the most common buyer has no previous stake in the firm. We find no evidence that the buyers pay, in median, for a seat on the board of directors, but the variability of the premiums for those blocks is higher and shows that buyers that had no control position in the target firm pay more for being among largest shareholders (partial control) and less for not being among them (influence).