Can expanding natural gas infrastructure mitigate CO2 emissions? Analysis of heterogeneous and mediation effects for China

To verify whether the expansion of natural gas infrastructure can effectively mitigate carbon dioxide (CO₂) emissions in China, this study first investigates the impact of natural gas infrastructure on China's CO₂ emissions by employing a balanced panel dataset for 30 Chinese provinces covering 2004–2017. Fully considering the potential heterogeneity and asymmetry, the two-step panel quantile regression approach is utilized. Also, to test the mediation impact mechanism between natural gas infrastructure and CO₂ emissions, this study then analyzes the three major mediation effects of natural gas infrastructure on China's CO₂ emissions (i.e., scale effect, technique effect, and structure effect). The empirical results indicate that expansion of the natural gas infrastructure can effectively mitigate China's CO₂ emissions; however, this impact is significantly heterogeneous and asymmetric across quantiles. Furthermore, through analyzing the mediation impact mechanism, the natural gas infrastructure can indirectly affect CO₂ emissions in China through the scale effect (i.e., gas population and economic effects) and structure effect (i.e., energy structure effect). Conversely, the technique effect (i.e., energy intensity effect) brought by natural gas infrastructure on CO₂ emissions in China has not been significant so far. Finally, policy implications are highlighted for the Chinese government with respect to reducing CO₂ emissions and promoting growth in the natural gas infrastructure.     

Identification of Multiple Fire Sources in the Utility Tunnel Based on a Constrained Particle Swarm Optimization Algorithm

Fire Technology - Fire disaster is one of the most dangerous disasters in the utility tunnel with plenty of high-voltage and communication cables. Fire source identification is an important part of...     

Study the effect of loading non-stoichiometric zinc sulfide on optical characteristics of PVA/CMC/PVP blended polymer films

Journal of Polymer Research - A fluorinated diamine, (2,5-bis(4-amino-3-trifluoromethylphenoxy)phenyl)diphenyl-phosphine oxide (2), was synthesized via Williamson reaction and hydrogenation. A...     

一株防治花生采后黄曲霉污染的拮抗菌的筛选及其防控效果

为预防花生储藏过程中的黄曲霉污染,从农田土中分离出2株拮抗芽孢杆菌,通过平板对峙法优选出1株作为研究对象,研究其对黄曲霉的抑制效果及对花生采后黄曲霉污染的防控效果。采用平板对峙法检测拮抗菌的抑菌广谱性并绘制生长曲线,并通过生理生化实验、形态特征观察及16S rDNA序列分析对该菌株进行鉴定。结果表明：优选出拮抗菌B419作为研究对象,其可有效抑制黄曲霉的生长,在拮抗菌浓度为1.0×10⁶ CFU/mL,黄曲霉孢子浓度为1.0×10³ CFU/mL时,黄曲霉孢子萌发抑制率达到98%;相比拮抗菌无菌发酵滤液和拮抗菌细胞悬浮液,拮抗菌发酵液防治花生黄曲霉污染效果最好;该菌株对互隔交链孢霉、枝孢霉、青霉、拟盘多毛孢等多种霉菌都有抑制作用,对大肠杆菌、酵母菌也有抑制作用;该菌株在培养4 h后进入对数期,14 h达到最大,26 h后进入衰亡期;该菌株被鉴定为贝莱斯芽孢杆菌(Bacillus velezensis)。综上,分离的拮抗菌B419对多种微生物都有抑制作用,不仅可以用来预防花生储藏过程中的真菌污染,在防治植物微生物病害方面也具有良好的应用潜力。     

Depression behaviors of N-thiourea-maleamic acid and its adsorption mechanism on galena in Mo-Pb flotation separation

In present study, a novel organic depressant N-thiourea-maleamic acid (TMA) was synthesized and applied as a galena depressant in the flotation separation of Mo-Pb ores. The depression behaviors of TMA were tested through flotation experiments. A wider separation window for single minerals over 90.0% was obtained at 30.0 mg/L TMA, confirming that TMA could depress galena significantly, while effected molybdenite floatability slightly. An effective separation was obtained for artificially mixed minerals and actual Mo-Pb ores. The adsorption mechanism on galena was revealed by UV–Vis spectra, zeta potential tests, Fourier transform infrared spectroscopy (FT-IR) analysis, contact angle tests and X-ray photoelectron spectroscopy (XPS) analysis. The zeta potentials of galena became more negative and the contact angle of galena dropped from initial 74.36° to 57.8° with 30.0 mg/L TMA depressant, inferring that TMA had adsorbed on galena surface. The analysis results of UV–Vis spectra, FT-IR and XPS gave further evidence that TMA might chemisorb on galena surface via Pb sites on galena surface and the thiourea group in TMA molecular structure, while the carboxyl group played a role of hydrophilicity.     

A bird's eye view of Ghana's renewable energy sector environment: A Multi-Criteria Decision-Making approach

This study examines Ghana's renewable energy (RE) sector environment using PESTLE analysis (Political, Economic, Social, Technological, Legal, and Environmental). The Analytical Hierarchical Process (AHP) was employed to rank the various identified factors using inputs from 20 experts in Ghana's RE sector. The consulted experts ranked economic factors as the most critical challenge in the sector. According to them, the cost of capital in Ghana is too high, especially for long-term investments such as RE. The country's abundant RE resources and its geographical location were ranked highest in terms of the opportunities in the RE sector.     

可穿戴技术在情绪识别中的应用进展及发展趋势

为促进情绪识别智能可穿戴产品技术在纺织服装领域的创新发展,系统介绍了近些年国内外情绪识别监测内容方法、分类算法以及情绪识别可穿戴设备的研究现状。首先概述了情绪分类模型并总结情绪产生时出现的生理反应;然后针对目前情绪识别监测内容方法的研究现状,阐述了生理信号和行为表现二大类情绪识别监测内容方法,进一步总结常用情绪识别分类算法,并依据可穿戴设备部位总结现有情绪识别可穿戴产品;最后讨论了情绪识别智能可穿戴设备在未来发展中需要解决的问题,并从柔性舒适采集设备、识别结果准确度以及识别结果交互方式3个方面展望其未来发展趋势和应用前景。     

欠发达地区工业发展的碳排放效应、影响因素及减排潜力——以苏北为例

以江苏苏北地区为例,分别从行业及地区层面运用碳排放分解模型测度工业发展的碳排放效应,运用扩展STIRPAT模型剖析工业碳排放的影响因素,进而利用碳排放潜力指数模型分析工业碳减排潜力。研究表明：近年来苏北工业碳排放强度逐年下降并低于全国平均水平,特别是电力、采矿、冶金、石化、造纸等行业,徐州、淮安两市碳排放强度明显下降;影响苏北工业碳排放的主要因素是能源消费强度、工业经济规模及行业结构,其次是居民生活水平及城市化发展水平;挖掘苏北工业碳减排潜力的重点在电力、采矿、石油加工、化学医药、冶金、装备制造、造纸等行业以及徐州、淮安、连云港等城市。据此提出加快能源领域科技创新步伐、建立重点行业碳排放目标管理和责任落实机制、加强重点城市碳排放管控、进一步挖掘碳减排潜力、促进苏北工业节能化和高级化转型等对策建议。