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16. Enhancing CO2 electroreduction to ethylene via microenvironment regulation in boron–imidazolate frameworks.

Author

Lu, Chen, Hong, Qin-Long, Zhang, Hai-Xia, and Zhang, Jian

Subjects
ELECTROLYTIC reduction, ETHYLENE, BORON
Abstract

Using the structure-induced effect of KBH(mim)3 ligand, four 2-dimensional (2D) boron imidazolate frameworks with identical body framework and different dangling monocarboxylate ligands, have been synthesized. Electrocatalytic results indicate that the surrounding microenvironment regulation could effectively affect the activity and selectivity towards C2H4. BIF-151 showed the highest electrocatalytic performances with the Faraday efficiency (FE) of 25.94% for C2H4 at −1.4 V vs. RHE. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Characterization of fluidized reduction roasting of nickel laterite ore under CO/CO2 atmosphere.

Author

Zheng, Si-qi, Zhang, Hai-xia, Wang, Xiao-fang, Hu, Hui, and Zhu, Zhi-ping

Abstract

Copyright of Journal of Central South University is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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21. Polynomials with palindromic and unimodal coefficients

Author

Sun, Hua, Wang, Yi, and Zhang, Hai-Xia

Subjects
Mathematics - Combinatorics, 05A20, 05A10, 15A03, 06A07
Abstract

Let $f(q)=a_rq^r+\cdots+a_sq^s$, with $a_r\neq 0$ and $a_s\neq 0$, be a real polynomial. It is a palindromic polynomial of darga $n$ if $r+s=n$ and $a_{r+i}=a_{s-i}$ for all $i$. Polynomials of darga $n$ form a linear subspace $\mathcal{P}_n(q)$ of $\mathbb{R}(q)_{n+1}$ of dimension $\lfloor{n/2}\rfloor+1$. We give transition matrices between two bases $\left\{q^j(1+q+\cdots+q^{n-2j})\right\}, \left\{q^j(1+q)^{n-2j}\right\}$ and the standard basis $\left\{q^j(1+q^{n-2j})\right\}$ of $\mathcal{P}_n(q)$. We present some characterizations and sufficient conditions for palindromic polynomials that can be expressed in terms of these two bases with nonnegative coefficients. We also point out the link between such polynomials and rank-generating functions of posets.

Published
2016
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31. Research on the Calculation of Urban Transport Carbon Dioxide Emissions: A Case Study of Guangzhou City

Author

Zhang, Hai-Xia, Liao, Wen-Yuan, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Tan, Ying, editor, Shi, Yuhui, editor, and Tang, Qirong, editor

Published
2018
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44. Determination of Cr (Ⅵ) in Coal Ashby Microwave Alkaline Digestion and Inductively Coupled Plasma-Optical Emission Spectrometry

Author

ZHANG Jie-fang, YAN Yu-le, XIA Cheng-li, JIAO Fa-cun, and ZHANG Hai-xia

Subjects
coal ash, cr (ⅵ), microwave-alkaline digestion, inductively coupled plasma-optical emission spectrometry, Geology, QE1-996.5, Ecology, QH540-549.5
Abstract

Quantitative determination of Cr (Ⅵ) in coal ash is very important for controlling the emission of highly toxic Cr (Ⅵ) produced by coal combustion. Available quantification determination methods are mainly used for detecting high concentration Cr (Ⅵ) in water, soil and solid waste, which are not suitable for analyzing low concentration Cr (Ⅵ) in coal ash. The sample processing methods are time consuming and the detection limits are relatively high. Thus, it is necessary to develop a convenient, effective and highly sensitive determination method for Cr (Ⅵ) in coal ash. In this study, alkaline solvent and the microwave digestion system were used for pretreatment of coal ash. Through the experiments, the digestion conditions, which included sample amount, microwave digestion time, and microwave digestion temperature were optimized. The chemical co-precipitation method was used to separate Cr (Ⅲ) and Cr (Ⅵ) in the extracted solution. The concentration of Cr (Ⅵ) was determined by Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES). The results show that the optimum digestion condition is 0.2 g sample digested under 9℃ for 60 minutes. The determination limit is 0.00134 μg/mL (in Table 1), and the average matrix spike recovery of practical samples is 87.2% (in Table 2). The detection limit of this method is 0.00033 μg/mL (in Table 1), suggesting that the sensitivity of Cr (Ⅵ) was improved by 10 times than that of the traditional 1, 5-diphenylcarbohydrazide spectrophotometric method (0.001 μg/mL).

Published
2017
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