如何提高油田伴生气的计量准确度

天然气按照油气藏分类可分为：气田气、凝析气田气和油田伴生气。其中油田伴生气是指在油气藏中，烃类以液相和气相两相共存，在开采过程中伴随原油同时被采出的天然气。目前对油田伴生气的计量基本上都是采用标准孔板节流装置配用CWD-430双波纹管差压计来进行计量。如何准确对这种天然气流体进行计量，是目前油田天然气计量中面临的一大难题。着重阐述了提高油田伴生气的计量准确度的措施。     

2002—2017年厦门市景观格局与 热环境的时空耦合关系

基于2002、2007、2012、2017年4期Landsat遥感影像，应用景观生态学和统计分析相结合的方法，探讨了厦门景观格局对热环境的影响作用及其变化规律。结果表明，2002—2017年，厦门市相对地表温度(Relative Land Surface Temperature，RLST)呈上升趋势，城区的热岛效应逐步凸显；RLST较高的区域多为耕地、建设用地，RLST较低的区域多为绿地、水体；在类型层面，绿地的景观类型比例、最大斑块指数、聚集度指数、平均斑块面积、形状指数与相对地表温度呈负相关，斑块密度、边缘密度与RLST呈正相关。耕地、建设用地的景观指数与RLST均呈正相关；在景观层面，景观分割指数、形状指数、斑块密度、边缘密度、香浓均匀度指数与RLST呈正相关；景观优势度大、聚集度高的景观类型，如耕地、绿地、建设用地对RLST影响显著。随着城区的扩张与耕地的减少，建设用地景观格局对RLST的影响逐渐加强，而耕地景观格局对RLST的影响不断减弱；景观层面的景观格局对RLST的影响作用与不同景观类型总体的结构组分及空间构型有关。随着景观结构趋于复杂，景观层面的景观格局对RLST的影响逐渐增强。     

铝硅镀层22 MnB5高强钢高温拉伸性能及本构模型

为了分析和表征热成形用的铝硅镀层22MnB5高强钢的热变形行为,采用Gleeble-3800热模拟试验机,在成形温度750～900℃、应变速率0.1～10 s-1试验条件下实施了铝硅镀层22MnB5高强钢的板材等温拉伸试验,采用双曲正弦型Arrhenius本构模型描述铝硅镀层22MnB5高强钢的高温流变行为,并考虑应变...     

公共充电基础设施对电动汽车购买的异质性影响研究

交通部门是中国最重要的碳排放源之一，交通电动化对实现双碳目标至关重要。本文以中国纯电动汽车消费为例，采集2017年1月至2020年11月中国31个省份（因数据缺失，不包含港澳台地区）充电桩数量及电动汽车销量数据构建面板固定效应模型和门槛效益模型，实证分析了不同类型公共充电基础设施对不同用途纯电动汽车购买的影响，以及不同地区温度对销量影响的门槛效应。研究发现公共充电桩数量增加1%，纯电动汽车购买量显著增加0.85%，其中出租租赁用途纯电动汽车销量显著增加1.57%。直流公共充电桩对纯电动汽车购买的影响远大于交流公共充电桩，并对不同用途的电动汽车存在异质性影响。此外，在气温更低的地方公共充电桩对纯电动汽车购买的影响更大，其显著门槛值为15摄氏度，且气温对出租租赁汽车的影响比非营业用途更大。政策制定者应合理考虑公共充电桩等基础设施的增设布局以保障电动汽车的续航能力，从而促进交通运输部门的脱碳进程。     

Temperature and outdoor productivity: Evidence from professional soccer players

We estimate the causal effects of ambient temperature on outdoor productivity, using the performance data of professional soccer players in the Chinese Super League (CSL) from 2014 to 2018. We exploit exogenous variation in the players’ exposure to temperature by matching it with hourly stadium temperature at the time of kick-off. We find that temperature has an inverted-U shaped relationship with players’ physical performance, and high temperature has a sizeable adverse impact on the cognitive performance. Our results are robust while considering alternative measures of productivity, potential avoidable behaviors, various playing styles, and possible climate adaptations. Furthermore, we focus on the economic consequences of reducing players’ productivity by investigating the adverse impacts of high-temperature exposure on social media attention and players’ human capital accumulation. Our findings suggest that the temperature profoundly impacts on the careers of outdoor workers both in the short- and long-term.     

Top-floor discounts in residential buildings: Evidence from South Korea

This study assesses the phenomenon of resale price discounts for top-floor units of residential buildings, or “top-floor discounts.” Using 1.9 million resale transactions of apartment units from South Korea, we find that top-floor discounts range from 1.3% to 8.3% of resale prices. We hypothesize that top-floor discounts exist because of larger heating/cooling costs for these units relative to those on lower levels, resulting from relatively more extreme variation in indoor temperatures unique to top-floor apartment units. Using a household-level survey data on energy consumption and exploiting variations in weather conditions and roof material across time and regions throughout South Korea, we provide evidence in support of our hypothesis.     

基于EIS的质子交换膜燃料电池输出性能优化

质子交换膜燃料电池(proton exchange membrane fuel cell, PEMFC)输出性能的影响是多方面的，极化曲线仅能反映燃料电池稳态外输出特性，不能充分反映具体影响因素及规律，因此需研究其内部物理参数的动态变化。通过建立电堆内阻和交流阻抗特性模型，利用电化学交流阻抗谱(electrochemical impedance spectroscopy, EIS)分析不同温度和湿度下燃料电池的内阻动态特性。结果表明，在333~353 K温度范围内，随着温度的增加，燃料电池的内阻减小；当温度不变时，相对湿度的增加能减小电堆内阻，燃料电池输出性能增强。最后，基于15kW燃料电池测试平台进行性能试验，验证了燃料电池动态特性分析的正确性，为进一步优化PEMFC输出性能提供理论支持。     

Disentangling the impact of temperature on consumers' attitudes toward nostalgic advertising

Although the effect of temperature on consumers is ubiquitous, little is known about how temperature affects consumers' attitudes toward nostalgic advertising. Drawing on embodied cognition theory, this study explores the effect of temperature on consumers' attitudes toward nostalgic advertising through the mediator of the affective system. Based on two experiments involving personal and historical nostalgic advertising, our results show that when exposed to comfortable temperature, consumers follow the “assimilative effect” of temperature; warm temperatures trigger more positive attitudes toward nostalgic advertising when compared with cool temperatures. However, when exposed to uncomfortable temperatures, consumers follow the “complementary effect” of temperatures; cold temperatures lead to more positive attitudes toward nostalgic advertising than hot temperatures. Furthermore, the affective system plays a mediating role between temperature and consumers' attitudes toward nostalgic advertising. This study contributes to the literature on temperature in marketing and provides a practical guide for companies to implement nostalgic advertising strategies.     

大跨度钢箱梁桥面沥青高温同步摊铺技术

本文主要通过沈阳市长青街快速路高架桥工程施工,研究分析钢桥面高温沥青摊铺技术对桥梁支座螺栓剪断病害的影响,并采取有效控制措施,确保工程质量,具有广泛的应用前景及推广意义。