我国资源型城市“高碳锁定”的内在机制及解锁路径——以安徽省淮北市为例

从“高碳锁定”效应在资源型城市中的表现及其影响切入,以安徽省淮北市为例,从技术层面、产业层面、制度层面及其综合层面分析我国资源型城市“高碳锁定”的内在机制,进而结合淮北实际,探讨了资源型城市“高碳锁定”的解锁路径与策略.     

Spider Silk-CBD-Cellulose Nanocrystal Composites: Mechanism of Assembly

The fabrication of cellulose-spider silk bio-nanocomposites comprised of cellulose nanocrystals (CNCs) and recombinant spider silk protein fused to a cellulose binding domain (CBD) is described. Silk-CBD successfully binds cellulose, and unlike recombinant silk alone, silk-CBD self-assembles into microfibrils even in the absence of CNCs. Silk-CBD-CNC composite sponges and films show changes in internal structure and CNC alignment related to the addition of silk-CBD. The silk-CBD sponges exhibit improved thermal and structural characteristics in comparison to control recombinant spider silk sponges. The glass transition temperature (Tg) of the silk-CBD sponge was higher than the control silk sponge and similar to native dragline spider silk fibers. Gel filtration analysis, dynamic light scattering (DLS), small angle X-ray scattering (SAXS) and cryo-transmission electron microscopy (TEM) indicated that silk-CBD, but not the recombinant silk control, formed a nematic liquid crystalline phase similar to that observed in native spider silk during the silk spinning process. Silk-CBD microfibrils spontaneously formed in solution upon ultrasonication. We suggest a model for silk-CBD assembly that implicates CBD in the central role of driving the dimerization of spider silk monomers, a process essential to the molecular assembly of spider-silk nanofibers and silk-CNC composites.     

“烟塔合一”内衬防腐技术的研究

结合采用“烟塔合一”排放技术的火力发电厂烟气腐蚀介质及腐蚀环境特点,对混凝土材质冷却塔内衬防腐蚀技术进行了比较,介绍了防腐蚀衬里或涂层对新钢筋混凝土设备基体表面的要求及对原有钢筋混凝土设备的影响,提出了冷却塔内防腐蚀方案为：采用厚膜型鳞片涂料,衬层厚度设计为1.2mm。     

MG410采煤机滚筒辅助叶片板的增设与应用

针对MG170/410-WD滚筒式采煤机在大倾角、仰角、“三软”煤层使用中遗漏在机道中的浮煤多、装煤效率低等问题,通过添加螺旋板数量对采煤机滚筒进行改造。改造后,在滚筒转速不变的情况下,提高抛煤效率,缩短了工作面割煤和工作面空顶时间,提高了装煤效率,从源头上降低了顶板管理的安全风险。     

5083 H321铝合金板材制备组织性能研究

基于"1+4"热连轧生产线、2800mm冷轧生产线,采用不同工艺线路制备了5083 H321铝合金板材,研究了不同制备工艺对板材组织性能的影响.结果表明,不同工艺路线成品板材力学性能、耐腐蚀性能及微观组织均存在明显差异.采用"1+4"热连轧生产线短流程工艺制备的5083 H321铝合金板材性能:抗拉强度358MPa、屈...     

A New Fashion: Dressing Up the Cities

Abstract

The aim of this article is to explore the urban knitting movement, a worldwide phenomenon that tries to combine a domestic activity, street or folk art, the reshaping of do-it-yourself culture, and peaceful forms of urban guerrilla protest. The activists employ colorful displays of knitted or crocheted cloth to enhance, beautify, personalize, and gentrify abandoned public places. Furthermore, they use the Internet to share knowledge on techniques and experiences, to organize collective actions, and to record and document their artistic installations. This article is focused on an urban knitting project realized in L'Aquila (Italy) three years after the 2009 earthquake. It was called “Mettiamoci una pezza” (“Let's Patch It”). The main aim of this project was to “dress up” the main square of the city, covering the gray metal barricades that still block off citizens from some areas of downtown and adding a sprinkle of color and warmth to the devastated city. We studied this movement in an ethnographic way, by applying a qualitative content analysis of the online materials and nonparticipatory observation of this event in L'Aquila in order to investigate what the collective action did both practically and symbolically. Our research shows how the movement was able to promote a very complex and meaningful political initiative.     

联合模糊聚类和多样本SSO优化SVR的配电通信网络流

针对电力通信网络流量预测问题,提出了一种联合模糊聚类和多样本群居蜘蛛优化（social spider optimization,SSO）SVR的配电网络流量预测方案。针对配电网络流量时序非线性、周期性特点,首先采用自适应模糊聚类方法（adaptive fuzzy C-means clustering）对流量样本数据进行预处理,实现了样本数据聚类自动划分,有效降低了流量数据短相关性对预测精度的影响;然后利用多样本SSO优化算法（multi-sample social spider optimization algorithm）对SVR预测模型参数进行优化,通过引入多样本、网格迭代进化策略,从而得到不同流量数据聚类对应的最佳SVR参数组合;最后,运用多样本SSO优化SVR模型对预测数据进行预测分析。仿真结果表明,同ARIMA、神经网络等配电网路流量预测模型相比,提出的预测方案预测精度提高了18.8%~34.1%。     

特厚易自燃煤层综放开采采空区防灭火技术

针对特厚煤层综放开采过程中工作面推进速度慢、采空区遗煤量大、漏风严重、极易自燃的特点,建立特厚煤层综放开采采空区渗流及扩散数学模型。利用富力矿-380 m前部22#层采空区的特征,对该特厚煤层采空区作出相应的假设,对该工作面采空区自燃“三带”进行划分,最终确定氧化带为采后距工作面25~60 m的范围。根据模拟结果,采取注氮注浆防灭火措施,取得较好的效果。利用该工作面现场数据进行数据拟合,验证防火措施效果,较好地达到防灭火的目的。     

西湖凹陷深层低渗-致密气藏“甜点”类型划分及成因探讨

低渗-致密气藏开发的关键是“甜点”的识别和预测,为探索海上少井、深层低渗-致密气藏“甜点”类型及成因,指导油气田勘探开发,利用岩心观察,铸体、阴极发光、扫描电镜等薄片鉴定,粒度分析,核磁共振,高压压汞,恒速压汞,孔渗测试和元素分析等多种手段对东海陆架盆地西湖凹陷X气田“甜点”进行研究。首先对研究区“甜点”定义进行探讨,并根据理论产能、物性、孔隙结构和束缚水含量将“甜点”分为3类：Ⅰ类“甜点”为高产气藏,以Ⅰ类孔隙结构为主,束缚水饱和度大多处于22%~57%;Ⅱ类“甜点”为中产气藏,储层中主要发育Ⅱ类孔隙结构,其次为Ⅰ类孔隙结构,少见Ⅲ类孔隙结构,束缚水饱和度大多处于45%~55%;Ⅲ类“甜点”为低产气藏,主要以Ⅲ类孔隙结构为主,发育少量Ⅳ类孔隙结构,束缚水饱和度大多处于45%~55%。认为Ⅰ类和Ⅱ类“甜点”能够实现现阶段经济有效开发,Ⅲ类“甜点”为后期开发的“潜力层”。研究认为,埋深是控制“甜点”发育的决定性因素,研究区4 000 m以深基本不发育Ⅰ类和Ⅱ类“甜点”;沉积环境是控制“甜点”发育的内因;事件性沉积作用及成岩作用是Ⅰ类和Ⅱ类“甜点”的重要影响因素;溶蚀作用是Ⅲ类“甜点”的主控因素;构造运动是研究区气藏“甜点”形成和保存的必要条件。     

On fixed-accuracy and bounded accuracy confidence interval estimation problems in Fisher’s “Nile” example

Fisher’s “Nile” example is a classic that involves a bivariate random variable (X,Y) having a joint probability density function given by f(x,y;𝜃) = exp(?𝜃x?𝜃^?1y), 0<x,y<∞, where 𝜃>0 is a single unknown parameter. We develop (i) fixed-width and (ii) fixed-accuracy confidence intervals for 𝜃 with a preassigned confidence coe?cient. In problem (i), we develop a purely sequential estimation strategy along with its asymptotic properties. In problem (ii), we determine that a fixed-sample-size estimation strategy will su?ce and yet the requisite sample size would have to be found. We have done that both exactly as well as approximately and we report that for all practical purposes the approximations nearly provide the exact sample size whether it is small, moderate, or large. The last problem we address is bounded-accuracy fixed-sample-size estimation of P_𝜃{X>Y}. All theoretical properties are adequately validated by large-scale simulations.