安徽500 kV/220 kV电网分层分区的初步设想

论述了电网分层分区的必要性及主要技术原则,结合安徽电网远景规划对安徽500kV/220kV电网分层分区进行了分析,并对安徽电网规划提出了相关建议.     

Death to Single-Family Zoning…and New Life to the Missing Middle

Abstract

Planners in the United States and Canada should stop defending single-family zoning, the single most harmful widely used practice in planning. In the century since first adoption, it has exacerbated both inequality and climate change. Land use regulations that make a singly occupied, detached house on a large parcel the only allowable option should be replaced, wherever they exist, with new rules that allow medium-density, or “Missing Middle,” housing to be built by right. These changes should be applied broadly at the scale of an entire city or, best of all, a state, rather than piecemeal. Encouraging recent events in Minneapolis (MN), Oregon, and elsewhere show that single-family zoning is being seriously challenged for the first time, but more progress is needed.     

吉林小西南岔铜金矿床成矿分带性研究

小西南岔铜金矿床在成因上与燕山早期的火山一深成杂岩关系密切,具有多期、多类型成矿作用叠加的特点,通过对其矿物组构、自然金的矿物学特征、矿石的稀土元素含量及Ag／Au比值、硫、氢氧同位素组成等特征的分析,发现在不同的标高成矿地质特征和地球化学特征等方面有一定规律的变化,形成浅部、中部、深部3个带。     

熔盐球床堆堆芯燃料管理优化初步分析

核热泉高温堆是具有满功率自然循环特性的熔盐球床堆,其特有的冷却剂横向流动特性需要基于径向分区换料的燃料循环方案,以及相应的燃料管理优化分析方法。局部搜索算法和模拟退火算法是普遍应用于轻水堆换料优化问题的随机性优化方法。本文应用这两种方法对核热泉高温堆的换料优化问题进行了分析。分析结果表明,相比于局部搜索算法,模拟退火算法能以较高的概率跳出局部最优陷阱,获得全局最优的优化结果,且优化质量独立于初始解的选取。最终的优化结果给出了较好的堆芯功率展平与压制燃料中心温度的效果。针对核热泉高温堆的一维分区换料方式,模拟退火算法是非常合适的优化分析方法。     

东鞍山矿矿岩可爆性分区灰色模型及其应用

本文论述了矿岩可爆性分区与分级的区别、可爆性分区指标的合理选择及分区灰色模型的建立,介绍了在东鞍山铁矿应用该模型而得到的矿岩可爆性分区的结果。     

岩体带状结构刍议

河谷岩体岸坡存在明显的带状结构，不仅包括工程上常需区分的风化分带及卸荷分带，而且岩体内的应力、结构类型、岩体质量等同样具有明显的分带特征，因此提出河谷岩体带状结构的概念不仅在理论上更加系统化，同时对于指导岩体工程的勘察设计具有重要意义。     

基于主导土地覆被的传统乡村景观区划 及特征研究——以粤东福佬区域为例

乡村景观是人类活动作用在自然基底上形成的综合性区域景观体系,在区域尺度上对景观空间特征进行分析并做区划研究有助于深入理解不同地域文化下的人地关系。以粤东福佬民系这一族群所在区域为研究对象,选择主导土地覆被这一敏感性指针,对区域景观类型特征进行描述与度量,最终依据区划原则划定沃土之乡、荒埔之乡、山野之乡、丘谷之乡、海滨之乡五大景观分区。进而在区域和聚落2类空间尺度下,借助景观指数及图式语言,探明了粤东福佬区域内5类典型乡村景观特征。在风景园林学科背景下,探索了一套新的乡村景观区划研究路径,为区域尺度的传统乡村景观特征研究提供了思路。     

地埋管换热器分区运行对地源热泵系统运行经济性影响的模拟研究

针对管群地埋管换热器,在不同夏冬季建筑负荷比运行条件下,对一种简单分区运行与不分区运行方式的循环水温度变化及系统能耗情况进行对比。结果表明:与不分区运行相比,采用简单分区运行方式时,地埋管循环水温度随运行时间的变化幅度相对较小,能耗降低,节能率随运行时间的增加而增大;随着夏冬季负荷比的增大,分区运行节能效果呈先增大后减小的趋势。研究结果表明,对于冬夏季负荷不平衡时,采用简单的地埋管换热器分区运行方式,可提升系统运行效益及可靠性。     

“线压平衡”及“自动修正”在软压光机液压系统中的作用——延长软压光机软辊胶层使用寿命的技术措施

通过对软压光液压系统及其软胶辊运行、损坏的跟踪研究,提出了"线压平衡"的理论,对分区可控中高软辊胶层使用寿命较短的问题提出了优化解决方案。     

Achieving Regional Housing Planning Objectives: Directing Affordable Housing to Jobs-Rich Neighborhoods in the San Francisco Bay Area

Problem, research strategy, and findings: Low-income households face affordability issues and are often forced to live in areas with limited job access and inadequate transportation. Local communities exacerbate these problems through exclusionary zoning. We study the impact of the Association of Bay Area Governments (ABAG) change in allocation formula under California’s affordable housing mandate. The old policy followed a fair share strategy, whereas the new policy requires local jurisdictions to locate mandated affordable housing units in jobs-rich areas. We compare affordable housing produced in the region before and after ABAG adopted the jobs-housing policy; we also compare the new patterns to the location of market-rate housing and to the experiences of San Diego (CA) and Los Angeles (CA), both of which retain fair share allocation. We do not control for variables that may have affected affordable housing location. ABAG’s policy shift is associated with a 104% improvement in the balance of housing and jobs at the local level; affordable housing units are more likely than market-rate housing to locate in jobs-rich areas, which may indicate that localities prioritize affordable housing. We also find that more affordable housing locates in such areas in the San Francisco Bay Area (CA) than in San Diego or Los Angeles.

Takeaway for practice: A voluntary regional government in a state with mandatory affordable housing requirements can affect the production and distribution of affordable housing. A total of 25 U.S. states require localities to include affordable housing elements in their comprehensive plans; we suggest that regional and local planners use these opportunities to meet multiple policy goals by directing affordable housing to jobs-rich neighborhoods.