| 1. |
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- 2019
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Journal article (peer-reviewed)
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| 2. |
- Zhao, Xiaogang, et al.
(author)
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Safety Prediction of Soleplate Corrosion State in Petroleum Storage Tank Based on Grey Theory Model
- 2016
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In: 3rd International Conference on Applied Engineering. - : AIDIC - associazione italiana di ingegneria chimica. - 9788895608433 ; , s. 271-276
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Conference paper (peer-reviewed)abstract
- The corrosion protection of petroleum storage tank is important for safety work in petroleum depot. Precise prediction of soleplate corrosion may reflect the security state of a storage tank, and it can provide scientific references to the anti-corrosion and maintenance in safety management. Grey Model GM (1,1) in the Grey Theory is a good prediction method based on small volume of original data, and it is introduced and applied to predict the soleplate corrosion of No. G-2 petroleum storage tank in Luquan oil depot. In order to improving the calculation speed, the GM (1,1) model is programmed by MATLAB and is further utilized in data processing. Compared with the measurements, the prediction results meet them very well, which shows that this model is practical. Meanwhile, the prediction results also reflect the status and the corrosion rate of a petroleum tank which is of great importance for the future safety management and maintenance works. Meanwhile, the GM (1,1) is suitable for wide applications in other relative fields in oil depots.
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| 3. |
- Zhou, Yi, et al.
(author)
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Research on Fire and Explosion Accidents of Oil Depots
- 2016
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In: 3rd International Conference on Applied Engineering. - : AIDIC - associazione italiana di ingegneria chimica. - 9788895608433 ; , s. 163-168
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Conference paper (peer-reviewed)abstract
- Fire and explosion accidents occurred frequently in oil depots in China which lead to great casualties, severe environmental pollution and large economic losses. Case studies of 435 fire and explosion accidents of oil depots in China from 1951 to 2013 are reviewed in this paper. From the analysis of time scale, area, facilities & equipment, ignition sources, types of accident substances, and responsibility, the statistic results show that the most dangerous area is the loading and unloading operation area, and the most vulnerable facilities & equipment are the storage tanks. Meanwhile, the proportions of ignition sources are so evenly distributed that the prevention of fire and explosion should be equally concentrated to several impact factors. The vapor cloud explosion could be the most common accident type in oil depots, and the management responsibility dominates in all of the accident causes. According to data analysis, special lessons learned from these accidents are proposed, and the majority of fire and explosion accidents in oil depots would have been prevented or avoided if security management had been improved.
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| 4. |
- Wilhelmsson, Mats, et al.
(author)
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Risk Assessment of Housing Market Segments : The Lender's Perspective
- 2018
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In: Journal of Risk and Financial Management. - : MDPI. - 1911-8074. ; 11:4
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Journal article (peer-reviewed)abstract
- It is well known that risk factors influence how investment portfolios perform from a lender's perspective; therefore, a thorough risk assessment of the housing market is vital. The aim of this paper was to analyze the risks from housing apartments in different housing market segments by using the Stockholm, Sweden, owner-occupied apartment market as a case study. By applying quantitative and systems engineering methods, we (1) established the relationship between the overall housing market and several housing market segments, (2) analyzed the results from the quantitative model, and (3) finally provided a feasible portfolio regarding risk control based on the given data. The goal was to determine how different housing segment factors could reveal risk towards the overall market and offer better outlooks for risk management when it comes to housing apartments. The results indicated that the risk could be reduced at the same time as the return increased. From a lender's perspective, this could reduce the overall risk.
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| 5. |
- Xu, Yalong, et al.
(author)
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Simultaneously Improved Efficiency and Stability in All-Polymer Solar Cells by a P-i-N Architecture
- 2019
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In: ACS Energy Letters. - : AMER CHEMICAL SOC. - 2380-8195. ; 4:9, s. 2277-2286
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Journal article (peer-reviewed)abstract
- All-polymer organic solar cells offer exceptional stability. Unfortunately, the use of bulk heterojunction (BHJ) structure has the intrinsic challenge to control the side-chain entanglement and backbone orientation to achieve sophisticated phase separation in all-polymer blends. Here, we revealed that the P-i-N structure can outperform the BHJ ones with a nearly 50% efficiency improvement, reaching a power conversion efficiency approaching 10%. This P-i-N structure can also provide an enhanced internal electric field and remarkably stable morphology Sequential deposition under harsh thermal stress. We have further demonstrated generality of the P-i-N structure in several other all-polymer systems. Considering the adjustable polymer molecular weight and solubility, the P-i-N device structure can be more beneficial for all-polymer systems. With the design of more crystalline polymers, the antiquated P-i-N structure can further show its strength in all-polymer systems by simplified morphology control and improved carrier extraction, becoming a more favorite device structure than the dominant BHJ structure.
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| 6. |
- Yuan, Jianyu, et al.
(author)
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Comparing the device physics, dynamics and morphology of polymer solar cells employing conventional PCBM and non-fullerene polymer acceptor N2200
- 2017
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In: Nano Energy. - : ELSEVIER SCIENCE BV. - 2211-2855 .- 2211-3282. ; 35, s. 251-262
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Journal article (peer-reviewed)abstract
- Current all polymer solar cells still suffer from low fill factors (FF) and short-circuit current density (J(sc)) compared with the conventional polymer/fullerene system. Herein in this work, devices using PTP8 as the electron donor and [70]PCBM as well as widely used polymer N2200 as the electron acceptor were systematically studied and compared. The major loss mechanisms in the all polymer solar cells were investigated to understand their relatively lower performance than the PTP8/fullerene system. By performing in-depth analysis on ultrafast transient transmission spectroscopy results, we estimated that in PTP8/N2200 device nearly half of the charges recombine geminately, which is confirmed as the major factor hindering the device performance of all polymer solar cells compared with polymer/fullerene system. Through thorough morphology analysis, the low charge generation efficiency is attributed to the reduced crystallinity of N2200 in the blend film and the unfavorable face-to-edge orientation at the donor/acceptor heterojunction. Coupling these results with knowledge from efficient polymer/fullerene systems, the future design of new polymers can devote to increase the attraction between the pi face of donor and acceptor, leading to enhanced face-to-face orientation at the heterojunction, while maintaining a high pi-pi stacking order for each polymer.
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| 7. |
- Zhou, Jianyu, et al.
(author)
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Addressing Initial Power Undershoots in Grid-Forming Converters : The Role of RHP Zero
- 2023
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In: 2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1374-1379
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Conference paper (peer-reviewed)abstract
- This paper investigates initial undershoots during the power response of grid-forming (GFM) converters. At first, the small signal model of the active power control loops (APC) is established. Based on the analytical model, the locations of the closed-loop RHP zero is utilized to indicate the existence and the peak of the initial undershoots. Subsequently, the impacts of the virtual impedance (VI) control and operating points on the initial power undershoots are comprehensively investigated. It is found that the VI control helps to dampen the oscillation but only has minimal influence on the RHP zero. In addition, the larger active power reference and smaller grid voltage leads to stronger undershoots. Finally, simulation results are presented to verify the accuracy of the established model and analysis.
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