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Yinchuan, China

Cao X.,Lanzhou Jiaotong University | Cao X.,Yinchuan Energy Institute | Ma C.,Lanzhou Jiaotong University
Journal of Bionanoscience | Year: 2014

In order to solve the problem of hazardous materials supplier selection of enterprise, this paper firstly used the intuitionistic fuzzy sets to describe evaluation index, and filtered the supplier evaluation index through the ISM model. Secondly, it used interval intuitionistic fuzzy multiple attribute decision method based on cross-entropy to calculate and model the weight of multi-attribute value of each hazardous materials supplier, and to get the right weight of each evaluation index. Thirdly, it obtained the optimal supplier by a grey relational analysis approach. Finally, the method was validated through a case, the results showed that the hazardous materials supplier selection method based on cross-entropy and grey relation is feasible and effective. This paper built the decision method which based on cross-entropy interval intuitionistic fuzzy sets and a grey relational analysis approach can satisfy the enterprises to choose the most suitable supplier as their own hazardous materials suppliers. Copyright © 2014 American Scientific Publishers. Source

Cui H.,Ningxia University | Cui H.,Yinchuan Energy Institute | Zhang Y.-H.,Ningxia University
Huanjing Kexue/Environmental Science | Year: 2016

The fenced measures could improve the ecological environment of degraded grassland, it's a main measure for restoration of degraded grassland vegetation in China. Soil respiration (Rs) is an important component of an ecosystem's carbon cycle and the main pathway for carbon moving from the ecosystem to the atmosphere. In order to explore soil respiration characteristics and influencing factors of the different fenced years in arid desert grassland, we continuously observed Rs rate and environmental factors in the growing season of fenced enclosure 11 a, 7 a and no fenced (CK) desert steppe in Ningxia. The results showed that: (1) Both the diurnal and seasonal variations of Rs rate showed a single asymmetric peak changing in fenced enclosure of 11 years, 7 years, CK desert steppe. On the daily scale, the maximum and minimum values of Rs rate were found in the periods of 12:00-16:00 and 00:00-06:00, respectively. On the seasonal variation scale, the maximum value of Rs rate occurred in August with suitable precipitation and temperature conditions. And the Rs rate of the growing season of different fenced enclosure years was in the order of 11 a [0.143 g·(m2·h)-1]>7 a [0.138 g·(m2·h)-1]>CK [0.106 g·(m2·h)-1]. (2) According to statistical analysis, it indicated that Rs rate had a significant exponential positive relationship with air and soil temperature in fenced enclosure of 11 years, 7 years, CK desert steppe (P<0.01). The order of the correlation of Rs rate and temperature was shown as soil surface temperature (R2: 0.408-0.413)>air temperature (R2: 0.355-0.376)>5-20 cm soil temperature (R2: 0.263-0.394). The temperature sensitivity coefficient Q10 increased gradually with the soil depth, and Q10 of different fenced enclosure years was showed as 11 a (2.728)>7 a (2.436)>CK (2.086). (3) A significant quadratic function model (P<0.05) was observed for the relationship between Rs rate and relative air humidity, soil moisture content of fenced enclosure 11 a, 7 a and CK desert steppe in the whole growing season. Rs rate had a significant linear negative correlation with air carbon dioxide concentration (P<0.01), a linear positive correlation with the wind speed (P<0.05), and a significant weak linear positive correlation with light intensity (P<0.01). (4) It showed that Rs increased with increasing fenced closure years in arid desert steppe, and temperature sensitivity coefficient Q10 also increased with increasing fenced enclosure years. To sum up, 0-20cm soil temperature and moisture were the main influencing factors of soil respiration of arid desert steppe. This study has important implications to understand the role that different fenced enclosure years play in carbon emission. Such information will lay a foundation for assessing carbon source or carbon sequestration of different fenced enclosure years in desert steppe. Therefore, our research results have important function for better managing grassland in desert steppe in Ningxia and other arid and semiarid areas of North China. © 2016, Science Press. All right reserved. Source

Wang W.,Dalian University of Technology | Wang W.,Yinchuan Energy Institute | Li X.,Dalian University of Technology | Sun Z.,Dalian University of Technology | And 5 more authors.
Applied Catalysis A: General | Year: 2016

The SiO2 supported Ni2P catalysts were prepared by H2 temperature-programmed reduction (TPR) or plasma reduction (PR) of two precursors, which were obtained by co-impregnation of SiO2 with (NH4)2HPO4 and Ni(NO3)2·6H2O with and without calcination. Their catalytic performances were evaluated by the hydrodenitrogenation of quinoline. The catalysts prepared by the TPR method showed a higher denitrogenation activity at low temperature (≤320 °C) but a lower denitrogenation activity at high temperature (≥340 °C) relative to those prepared by the PR method. The results of CO chemisorption and XPS analysis suggest that this can be explained that more metallic Ni species were present in the surface of the catalysts prepared by the TPR method, which enhanced their hydrogenation activity at temperatures below 340 °C. Calcination of the precursor is not necessary for the preparation of Ni;bsubesubbsubesub. However, both the dispersion and the surface composition of the Ni2P phase were affected by the calcination and reduction approaches. © 2015 Elsevier B.V. All rights reserved. Source

Yang J.,Ningxia University | Yang J.,Yinchuan Energy Institute | Sun Z.,Ningxia University | Luo C.,Ningxia University | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

Takyric solonetz, a typical subclass of alkali soil, is widely distributed in the north of Yinchuan Plain of Ningxia Province, the west of Hetao Plain and the desert steppe in north Xinjiang in China. Due to the hard soil texture, poor permeability and difficult improvement, takyric solonetz has become the main factor severely affecting the development of local agriculture, and is expected to bring threat to the regional food security in the future. More and more improvement techniques have been developed to achieve a sustainable utilization of saline-alkali waste land, but the effect of the treatment of leaching + gypsum + furfural residue + desert sand + deep scarification + soil bin on soil properties and yield of oil sunflower on newly reclaimed takyric solonetz land remains unknown. In the present study, we conducted a three-year field comparative experiment to investigate the effect of different salt-water regulation modes on soil properties and yield of oil sunflowers, which were planted on newly reclaimed takyric solonetz land on the Qianjin Farmland of Xidatan, Ningxia (106° 24'209″ E, 38° 50'289″ N). On the basis of the unified application of desulfurization gypsum of 28 t3/hm2, furfural residue of 22.5 t3/hm2 and leaching water of 4 500 m3/hm2, 7 salt-water regulation measures were applied: desert sand (T1), deep scarification (T2), soil bin (T3), desert sand + deep scarification (T4), desert sand +soil bin (T5), deep scarification + soil bin (T6), and desert sand + deep scarification + soil bin (T7). A flat field only with leaching (4 500 m3/hm2) was used as control (CK). Soil permeability, pH value, electrical conductivity (EC), exchangeable sodium saturation percentage (ESP), salt ions and growth of oil sunflower were monitored during the whole growth season. Results indicated the pH value, EC, ESP and salt ions in 0-40 cm soil layer significantly decreased (P< 0.01) under T7 compared with those under CK, and the pH value, EC and ESP decreased by 22%, 95% and 71% respectively. Furthermore, the values of pH, EC and ESP were lower in the third year than those in the first year, which dropped to 7.25, 0.087 ms/cm and 5.2% respectively. By comparing the values of pH, EC and ESP between the 7 treatments in 0-40 cm, our results indicated that these values were the highest under T7, followed orderly by T6, T4, T2, T5, T3 and T1, and T1 showed the lowest values. In addition, T7 increased the emergence rate and the yield of oil sunflower by 6% and 16%, 8% and 19%, 3% and 15%, 21% and 28%, 16% and 20%, and 19% and 21% respectively compared to T6, T4, T5, T2, T3 and T1. We thus conclude that the regulation mode of desert sand + deep scarification + soil bin is able to improve the newly reclaimed takyric solonetz land most effectively. These results will also provide a technical support for the salt-water management of the newly reclaimed takyric solonetz farmlands, and a guide for the sustainable development and utilization of waste takyric solonetz land. ©, 2015, Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering. All right reserved. Source

Wang W.,Dalian University of Technology | Wang W.,Yinchuan Energy Institute | Wang A.-J.,Dalian University of Technology | Wang A.-J.,Liaoning Key Laboratory of Petrochemical Technology and Equipment | And 3 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

The bulk Ni2P was synthesized by means of hydrogen plasma reduction (PR). A mixture of 10% H2S in Ar was used to passivate the freshly-synthesized Ni2P to protect their crystal structures before entering the fixed bed reactor. The experimental results show that their catalytic performances are higher in the hydrodesulfurization (HDS) than those prepared by the conventional temperature-programmed reduction (TPR) method. XRD characterization results reveal that there exist more active sites in the PR-synthesized Ni2P than in the TPR-synthesized ones due to the decreased particle sizes of the PR-synthesized Ni2P. The PR-synthesized Ni2P exhibits a good stability during HDS reaction. ©, 2015, Editorial Office of Chemical Engineering (China). All right reserved. Source

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