Recovering Sociology from the Trash Heap: Of Waste Politics and the Spatialization of Local Representation in Lagos

This article excavates the debate that unfolded during the 1980s between Jacques Rancière and Pierre Bourdieu to shed light on the theoretical divide that still cuts across the field of urban studies today. Looking at contemporary Rancièrian scholarship through a Bourdieusian lens, it points to their main theoretical shortcomings and reasserts the value of relational, field‐based and empirically grounded approaches to urban politics. At the same time, this article engages seriously Rancière's critique of Bourdieu's failure to account for space in order to question the territoriality inherent to the notion of field. We put this theoretical discussion to the test of Lagos's garbage. Drawing on an ethnographic study conducted in Lagos from 2015 to 2016, we propose analyzing the process of spatialization of the field of local representation by looking at the ways solid waste—here conceived as a political opportunity—is mobilized by different actors. We argue that the deployment of a waste infrastructure in Lagos is congruent with a relative disinvestment in practices of territorial control that reshapes the structure of local representation, reconfiguring the ‘stage’ on which politics is played out in the Nigerian metropolis.     

一款小型化S频段高谐波抑制功率放大器的设计

为了确保卫星系统电磁兼容性满足要求，设计了一款应用于卫星测控通信系统的小型化S频段高谐波抑制功率放大器。通过在功放输出端设置谐波抑制网络改善了电路的谐波抑制性能。采用集总与分布参数元件相结合匹配形式，实现了电路的小型化设计。电路尺寸38.5 mm×28.2 mm。通过对功放腔体结构进行细化建模仿真，确保了功放电路的稳定性。实测结果表明，当工作频率为2.52 GHz时，功放1 dB压缩点大于31 dBm，谐波抑制度大于61 dBc，功率附加效率高于35%，1 dB带宽大于320 MHz。与国内外同类产品相比，该功放在谐波抑制性能等方面具有明显优势。     

Municipal solid waste management and greenhouse gas emissions at international airports: A case study of Astana International Airport

The steady expansion of the city of Astana and the increase of airport capacity is leading to an increase in municipal solid waste generation. The purpose of this study was to perform compositional analysis of the municipal solid waste produced at the Astana International Airport and evaluate different waste management scenarios in terms of greenhouse gas emissions. Recyclable and combustible fractions were found to be the major fractions (over 50%) of the total municipal solid waste generated in the Astana International Airport. Four base greenhouse gas emissions scenarios were proposed in this study, namely scenario-1 describing the current municipal solid waste management case, scenario-2 with integration of 29% recycling and 71% of municipal solid waste landfilling, scenario-3 for 100% of airport municipal solid waste being incinerated and scenario-4 for recycling 29% and the remaining waste being processed for energy recovery purposes. The proposed scenario 2 demonstrated significantly reduced net greenhouse gas emissions (t CO₂ eq/year) over the existing scenario 1, while scenarios 3 and 4 showed negative net greenhouse gas emissions. The experimental data provided and the scenarios discussed in this work are useful tools for decision makers for environmental waste management at airports.     

万古霉素高产菌株选育及发酵配方优化

为了提高东方拟无枝酸菌产万古霉素的发酵单位,降低生产成本,采用紫外诱变、常压室温等离子体诱变对东方拟无枝酸菌出发菌株V19-02进行诱变处理,通过筛选链霉素抗性突变菌株,选育高产菌株;通过对发酵培养基中碳源和氮源进行筛选,选取葡萄糖、淀粉、低温豆粉、酵母粉4个因素进行均匀设计。结果表明,获得的高产菌株V19-1-07摇瓶发酵单位提高33.7%,且具有良好的传代稳定性;优化后的培养基配比质量分数为葡萄糖8.0%、淀粉1.0%、低温豆粉1.0%、酵母粉4.0%、氯化钠1.0%、磷酸二氢钾0.1%;小试结果证明,优化配方可使50 L罐发酵单位平均达到14 110 μg/mL,比原始配方提高了28.9%。因此,研究获得的高产菌株V19-1-07可应用于万古霉素工业化发酵生产,以帮助企业降低成本,进一步提高竞争力。     

“社交礼仪”四维立体教学创新研究

对高校学生开展的礼仪教育应该是立体的从内到外的完整塑造,这种教学方法好比一个三角锥体,由四个面构成,分别是基础素养、礼仪规范、模拟实践和经典阅读,谓之“四维立体教学法”,如此才能塑造出具有健全人格和良好行为习惯的公民。     

AutoCAD三维实体造型技术在道路工程制图教学中的应用

随着高职院校教学改革的不断深化,课程的理论教学时数普遍较以前减少,如何利用有限的课时使学生掌握必需的理论知识,提高学生的绘图和识图能力,是道路工程制图教学面临的实际问题。利用AutoCAD三维实体造型技术作为辅助教学工具,可以使学生快速建立空间立体概念,将抽象的问题直观化,教学效果良好。     

钢丝绳淋油装置的改造设计及故障分析

本文主要分析了钢丝绳除油装置设计技术难点、创新点以及电气原理图设计,最后分析总结了常见故障的分析及解决方法。     

泡沫对食品发酵的影响及控制

本文分析了食品发酵过程中泡沫的产生机制、影响,介绍了常用的泡沫控制策略。重点分析了不同消泡剂的作用机理,以及联合控制措施,以期为生产中泡沫消除提供参考。     

一种便携式气体体积计量系统的设计

为了在实验室中计量厌氧发酵时产生的沼气体积,设计了一种便携式气体体积计量系统,并分析了系统的构成及运行流程,给出了主要硬件及软件设计方法。试验结果表明,该系统结构合理,使用方便,满足实验室测量气体体积的需要。     

红枣枣醋发酵工艺的优化

以新疆"哈密大枣"为原料,结合现代醋酸发酵技术制作冬枣枣醋,对枣醋发酵温度、醋酸菌接种量、初始酒精度和初始pH值4个影响因素进行分析,探讨冬枣枣醋最佳发酵条件,试验结果表明:当发酵温度为30℃,醋酸菌接种量为3%,酒精度为6%,初始pH为3.0时,15 d时醋酸含量达到5.76 g/100 mL。