International Journal of Financial Studies
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2022
·Vol. 11
·期 1
·7
·
IF 0
Mosab I. Tabash,Umaid A. Sheikh,Ali Matar,Adel Ahmed,Dang Khoa Tran
The existing literature has explained the causality flow from the exchange rates toward the stock market without explaining the role of the economic crisis in effecting this nexus. This study examines the role of the financial crisis in affecting the nonlinear causality flowing from the exchange rates toward the stock market indexes of the ASEAN-5 region. The precrisis, postcrisis, and overall sample duration comprised 365, 650, and 1085 observations over the periods from January 2002 to January 2008, January 2010 to January 2020, and January 2002 to January 2020, respectively. The results showed that the conventional symmetrical panel ARDL (PARDL) model was not able to formulate long-run cointegration between currency value fluctuations and stock market indexes for both regimes, i.e., the post recessionary and pre recessionary periods. However, asymmetrical cointegration was established between the currency values and stock market indexes for the pre recessionary period and the overall sampling time frame by utilizing the panel-based NARDL framework (PNARDL). The study suggests practical implications for the exporters and importers to consider the regime as well as both the negative and positive shocks in the international dollar values while making forward contractual agreements.
研究领域:
计量经济学
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金融学
·
应用经济学
✓ 已验证
DOI
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Wenbo Li,Shaojie Ma,Yuchen Zhu,Bin Zhao,Fei Feng
This paper reports a micro gas chromatographic column (μGCC) with in-situ growing macro-porous silicon as the stationary phase support layer. The macro-porous silicon stationary phase support layer (MPSL) with uniform thickness was fabricated in-situ on the inner surface of the μGCC channels by metal-assisted chemical etching. In order to avoid the negative effect of uneven thickness of the stationary phase, a 10 nm alumina film was deposited as the stationary phase on the MPSL using the atomic layer deposition technique. The macro-porous structure and high specific surface area of the MPSL provide longer diffusion paths and larger mass transfer interfaces for the analytes, which reduces the longitudinal gas diffusion and mass transfer resistance, thus improving the column efficiency. The μGCC with the MPSL achieved a 1306.7% increase in the theoretical plate number and a 195.0 % improvement in the resolution for n-nonane compared with the μGCC without the MPSL.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 46
·65243-65254
·
IF 4.223
Chen Tao,Cao Zhonghong
To explore the relations between the number of accident deaths (NCD) and various factors in construction safety, a multiple linear regression model was established, based on the panel data of economy, construction labor, and the number of accident deaths in 31 provinces (regions) of China from 2009 to 2018. The results show that the average total profits and taxes (TPAT), and the death rate of ten thousand people (DR) are positively correlated with NCD, while the labor productivity (LP) is negatively correlated with it. Under the condition that other factors remain unchanged, NCD increases by 0.02 per a hundred million CNY. However, if DR increases by one ten thousand, NCD will increase by 8.66 on average. On the contrary, when LP increases by a hundred million CNY per ten thousand people, NCD decreases by 0.19. The model also predicts NCD in different provinces and cities from 2019 to 2020 with the method of quadratic exponential smoothing. As well, practice results show that the model is effective and practical.
研究领域:
安全工程
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建筑工程
·
应用统计学
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公共安全
·
劳动经济学
✓ 已验证
DOI
高影响因子
Journal of Energetic Materials
·
2022
·
IF 2.421
Yi-Fan Zhang,Song Zhang,Le-Wu Zhan,Wan-Ying Tang,Jing Hou,Bin-Dong Li
Current methods, including ball milling and spray drying, are subject to some restrictions in application for preparing nano 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105), such as too large volume of dangerous goods, unstable temperature as well as discontinuous industrial production. In this study, continuous and safe preparation of nano-LLM-105 was achieved using microfluidic technology. Several influence factors had been studied on the particle size of LLM-105 including supersaturation, microreactor structure, solvent/non-solvent ratio, the total flow rate, reactor temperature, as well as the number of plates. Results showed that supersaturation of solution and structure of the microreactor played a critical role in the formation of nano-scale LLM-105. Further analysis on these nano-particles revealed its D50 was 124.95 nm with a spherical-like narrow shape through scanning electron microscopy and particle size distribution curve. X-ray diffraction results show that the crystal structure of nano-LLM-105 has not changed, and the differential scanning calorimeter test results show that nano-LLM-105 still maintains good thermal stability compared to raw-LLM-105. In short, this protocol provides a new route for continuous and safe preparation of nano-level LLM-105, which could be potentially applied to other nano-energetic materials, such as HMX and CL-20.
研究领域:
化学工程
·
材料科学
·
纳米技术
·
炸药
✓ 已验证
产品关联
DOI
高影响因子
ELECTROPHORESIS
·
2018
·Vol. 40
·期 4
·521-529
·
IF 2.569
Feng Chang,Yunfang Yue,Zihui Yang,Si Huang,Zhihua Liu,Kunmiao Wang,Yan Peng,Yingzhuang Chen,Ming Ma,Bo Chen
The easy shrinkage and swelling of polymer monolithic column when exposed to mobile phase with different polarity is a problem that cannot be ignored. To overcome this drawback, a convenient aqueous two-phase polymerization approach was used to prepare poly (polyethylene glycol diacrylate, PEGDA) monolithic porous layer open tubular (mono-PLOT) columns (150 μm). The poly(PEGDA) mono-PLOT column with homogeneous polymer porous layer was synthesized successfully. A maximum plate number of 41,500 plates per meter for allyl thiourea was obtained under a velocity of 1.8 mm/s. Several kinds of polar molecule were separated on the proposed mono-PLOT column and a typical hydrophilic interaction retention mechanism was observed. High speed separation of benzoic acids was also carried out, baseline separation of five benzoic acids was successfully achieved within 5 min with a 70 cm mono-PLOT column at 50°C. Furthermore, the resulting PLOT column was also successfully applied to separate standard analytes of three DNA oxidative damage products and RNA-modified nucleosides and four chlorophenols. At last, the column could separate alcohols, alkanes, and aromatic isomers via GC. It had more than 20,000 plates per meter for butanol – higher than commercial coatings open tubular columns.
研究领域:
分析化学
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色谱学
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高分子科学
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气相色谱
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亲水作用色谱
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）