9 results on '"Chen, Huabao"'
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2. Optical temperature sensing using upconversion luminescence in rare-earth ions doped Ca2Gd8(SiO4)6O2 phosphors
- Author
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Zhang, Jia, Chen, Guibin, Zhai, Zhangyin, Chen, Huabao, and Zhang, Yamei
- Published
- 2019
- Full Text
- View/download PDF
3. The introduction of wet dyeing sludge pellets in the production of clay brick: A novel approach to promote the disposal efficiency.
- Author
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Chen, Huabao, Jiang, Haohao, Zhang, Wenyi, Peng, Mingguo, Liu, Yuhua, Hu, Linchao, Gao, Bingying, and Mao, Linqiang
- Subjects
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BRICKS , *HEAVY metal toxicology , *PELLETIZING , *SOLID waste , *CLAY , *COMPRESSIVE strength - Abstract
The introduction of dyeing sludge in the fired brick production is an economic and practical disposal approach. Wet dyeing sludge with high moisture usually produces block mass during mixing process of raw materials, not only reduces the production efficiency but negatively impacted products engineering properties. This study proposed a highly efficient method, wet sludge firstly being pelleted and then introduced in the production of fired bricks, to reduce the negative impacts on mixing process and the products quality. It was proved that the introduction of dyeing sludge pellets remarkably improved physical and mechanical properties of fired bricks. Especially, water absorption declined by 12% and compressive strength increased by 35% comparing with dyeing sludge without pelleting. The engineering properties of fired bricks containing 25 wt% sludge pellets are similar with that containing 15 wt% sludge without pelleting. The decrease in water absorption and porosity is mainly attributed to the reduction in number and volume of pores with diameter below 100 nm. It was considered that pellets with greater density and higher strength might play a role as aggregate to improve compressive strength. However, the introduction of sludge pellets with particle size over 8 mm is adverse to improving properties of products, because a large amount of macropore with diameter over 100 μm is produced, and destroys the homogeneous and compact structure of products. The optimal sludge pellet size is in the range of 2–6 mm based on products performance. The leaching toxicity of heavy metals from products is far lower than regulatory limitation. This study provides an advanced method to promote the disposal efficiency of solid waste and improve the engineering quality of products. • The introduction amount of dyeing sludge is promoted remarkably. • Physical and mechanical properties are improved significantly. • The optimal particle size of sludge pellets is 2–6 mm. • Pore volume below 100 nm in fired brick are reduced. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Wet dyeing sludge being pelleted and introduce d in clay brick production to promote product quality and sludge consumption dosage.
- Author
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Chen, Huabao, Jiang, Haohao, Liu, Yuhua, Yu, Haoran, Liu, Changmin, Zhang, Wenyi, Peng, Mingguo, Hu, Linchao, and Mao, Linqiang
- Subjects
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BRICKS , *PRODUCT quality , *PELLETIZING , *SOLID waste , *WASTE products , *CLAY - Abstract
• A novel and high efficient approach to disposal of dyeing sludge is proposed. • Physical and mechanical properties are improved significantly. • The optimal particle size of sludge pellets is 2–6 mm. • The number and volume of pores below 100 nm are reduced due to pellets. The introduction of dyeing sludge in the production of fired brick is an economic and practical disposal approach. However, wet dyeing sludge is easy to form block mass during the mixing process of raw materials due to the high moisture content, which affected the production efficiency and destroyed the homogeneous structure of the fired brick, posing a negative impact on the engineering performance of the fired brick. In this study, wet sludge firstly is firstly pelleted and then introduced in the production of fired bricks to reduce the negative impacts on mixing process and the products quality. The results showed that the introduction of dyeing sludge pellets significantly improved the physical and mechanical properties of fired bricks. Compared with bricks incorporating dyeing sludge, water absorption is reduced by 24 % and compressive strength is increased by 101.6 %. The physical and mechanical properties of fired bricks incorporating 30 wt% of pelleting sludge are similar with bricks incorporating 20 wt% dyeing sludge without pelleting. The reduction in water absorption and porosity compared to that incorporating sludge without pelleting was mainly due to the reduction in the number and volume of pores of the same size. However, the introduction of more than 30 wt% dyeing sludge pellets is not conducive to improving the performance of the product, because a large number of macropores with size larger than 100 μm will be generated, which destroys the uniform and dense structure of the product. To ensure product quality meet the standard, the maximum dosage of dyeing sludge with pelleting is controlled below 30 wt%. This study provides an advanced method to improve the treatment efficiency of solid waste and the quality of products. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
5. Effects of electric arc furnace slag on promoting quality and environmental safety of fired bricks incorporating municipal solid waste incineration fly ash.
- Author
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Chen, Huabao, Liu, Yuhua, Cui, Hao, Zhang, Wenyi, Hu, Linchao, and Mao, Linqiang
- Subjects
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INCINERATION , *ENVIRONMENTAL quality , *ARC furnaces , *ELECTRIC arc , *ENVIRONMENTAL security , *MUNICIPAL solid waste incinerator residues , *FLY ash - Abstract
• The presence of salts influenced negatively properties of fired brick. • Desalination is required for the reuse of fly ash in brick production. • Chemically bonding forms of heavy metals changed after firing. • Leaching of heavy metals below regulation standards. The introduction of municipal solid waste incineration fly ash (MSWIF) during manufacturing process of fired bricks is a promising disposal method. However, the quality of products is negatively reduced and environmental risk increased significantly with the addition of MSWIF. This study proposed a novel approach to enhance the quality and environmental safety of fired brick by adding electric arc furnace slag (EAFS) as the pore plugger, which could overcome disadvantages brought by the introduction of MSWIF. Results showed that linear shrinkage and bulk density increased with the addition of EAFS, while water absorption and apparent porosity are reduced by more than 50%. The fracture microstructure of fired brick changed from porous to smooth with the addition of EAFS. The thermal conductivity declined by 25% and 30% at 1050 and 950 °C, and compressive strength was enhanced by 50% with the addition of 30 wt% EAFS. The chemically combination reactions between raw materials, such as the formation of albite, are promoted remarkably with the addition of EAFS. The leaching concentrations of heavy metals are far lower than regulatory limitations and environmental safety are enhanced significantly. In all, the addition of EAFS can promote the quality and environmental safety of fired brick, and can be used as an effective way to solve problems caused by introducing heavy metal solid waste. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
6. Temporal and spatial dynamics of wheat powdery mildew in Sichuan Province, China.
- Author
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Liu, Na, Lei, Yu, Gong, Guoshu, Zhang, Min, Wang, Xu, Zhou, You, Qi, Xiaobo, Chen, Huabao, Yang, Jizhi, Chang, Xiaoli, and Liu, Kai
- Subjects
WHEAT powdery mildew fungus ,CONTROL of phytopathogenic microorganisms ,METEOROLOGY ,PLANT development - Abstract
Wheat powdery mildew, which is caused by Blumeria graminis f. sp. tritici , is an important and destructive wheat disease that can cause a considerable reduction in grain yield. The temporal dynamics of wheat powdery mildew examined over a five-year period (2007–2012) indicated that disease incidence and index fitted an “S”-shaped curve. The initial stage of wheat powdery mildew occurred mainly in late November, and the logistic stage in 2010–2011 was the longest in all experiments. The 2010 and 2011 experiments exhibited the highest disease index across the five years. The logistic curve best fit disease development during the five years and provided a good prediction of powdery mildew with an accuracy of 85%. Meteorological factors in March and April were highly correlated with disease index. To better understand powdery mildew epidemics, effective dispersal of the fungus was studied in 2011 and 2012. The results showed that the pathogen can spread more than 500 cm in one infection cycle. The rate of disease spread was relatively fast between late March and mid-April in 2012 and reached 175 cm/d. Curve fitting of the disease spread distance in eight directions identified the exponential and quadratic functions as the best fitting curves. Information on the temporal dynamics and effective spread distance of wheat powdery mildew and the relationship between disease epidemics and weather conditions provides the insight needed for future disease forecasting and management. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
7. Over-summering of wheat powdery mildew in Sichuan Province, China.
- Author
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Liu, Na, Gong, Guoshu, Zhang, Min, Zhou, You, Chen, Zhixiang, Yang, Jizhi, Chen, Huabao, Wang, Xuegui, Lei, Yu, and Liu, Kai
- Subjects
WHEAT powdery mildew fungus ,GRAIN -- Losses ,PEST control ,EXPERIMENTAL agriculture ,INOCULATION of crops ,CORN yields - Abstract
Abstract: Wheat powdery mildew, caused by Blumeria graminis f. sp. tritici, is a serious disease worldwide, and a problem in China, especially in Sichuan Province, where it causes partial or total loss of grain yield on susceptible varieties when climatic conditions are favorable. In this study, we clarified ways and areas of the over-summering of this fungus, and provided information for control of the disease in Sichuan Province. We observed cleistothecial survival under a variety of different storage conditions both indoors and outdoors. Cleistothecia in humid conditions completely died by mid-July; those in dry conditions maintained a 40% survival rate into the autumn. Cleistothecia were not only able to survive until fall, but also to produce ascospores as initial inoculums for autumn-sown wheat. Field inoculation experiments using ascospores and conidia at different altitudes in Ya''an, Yibin, and Bazhong demonstrated that B. graminis f. sp. tritici is able to over-summer at an altitude of 595 m and above in Sichuan Province. Volunteer wheat plants are abundant in these areas. Through systematic monitoring, volunteer wheat plants were found to be heavily infected during the summer months, providing an inoculation bridge to the fall planting season. The type of crops following wheat also had an important influence on the over-summering of the fungus; high-shade corn was more favorable to volunteer wheat survival and the occurrence of powdery mildew than short-shade soybeans. The most effective strategy for reducing inoculation would be to eliminate the remaining wheat straws and the volunteer wheat before fall seeding. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
8. The introduction of sulfates to suppress Cr(III) oxidation during incineration of tannery sludge and reduce leachability toxicity of incineration residue.
- Author
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Gao, Bingying, Jiang, Haohao, Chen, Huabao, Peng, Mingguo, Zhang, Wenyi, Hu, Linchao, and Mao, Linqiang
- Subjects
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INCINERATION , *HAZARDOUS wastes , *SULFATES , *TANNERIES , *INCINERATORS , *OXIDATION - Abstract
Incineration is an alternative approach to disposal of tannery sludge due to the significant volume reduction. But the Cr(III) oxidation caused by Ca hydrates or carbonates in the incineration process could lead to incineration residue exceeding the required standard in the leaching toxicity of Cr(VI) and being listed in hazardous waste. A novel method of suppressing Cr(III) oxidation by introducing sulfates during the incineration of tannery sludge is proposed in this study. Cr(III) oxidation can be effectively inhibited with the introduction of NH 2 SO 3 H, NH 4 HSO 4 and NaHSO 4 at n (S)/ n (Ca) over 1.2. The combination reaction of sulfates and CaO prevents the Cr(III) oxidation. The inhibition of Cr(III) oxidation by sulfates is the most effective at 700–900 °C because almost all Ca is incorporated into CaSO 4 phase. NH 2 SO 3 H and NH 4 HSO 4 perform better in inhibiting Cr(III) oxidation than NaHSO 4. The intermediate product of Cr 2 (SO 4) 3 , which is formed below 500 °C, would decompose into Cr 2 O 3 with the temperature of over 600 °C. However, part of Cr 2 O 3 is still oxidized into CaCrO 4 aroused by CaSO 4 at a temperature of over 900 °C. Kinetic study showed Cr(III) oxidation could be effectively suppressed even if the heating time extends to 2 h at 800 °C. Toxicity Characteristic Leaching Procedure showed that the leaching concentrations of Cr(VI) from incineration residues with the introduction of NH 2 SO 3 H and NH 4 HSO 4 at n (S)/ n (Ca) of over 1.2 satisfied the requirement, and resultant residues could not be classified as hazardous waste. Due to inhibiting Cr(III) oxidation with high efficiency at 700–900 °C, the introduction of sulfates can be considered as a potential approach to prevent Cr(VI) formation during the incineration of tannery sludge by fluidized bed incinerator. • Cr(III) oxidation are suppressed by sulfates during heating of tannery sludge. • Inhibiting Cr(III) oxidation is strongly determined by temperature. • NH 2 SO 3 H and NH 4 HSO 4 are more effective in hindering Cr(III) oxidation than NaHSO 4. • Cr(III) oxidation is suppressed with sintering time being extended to 2 h. • Incineration residues cannot be listed as hazardous waste with adding of sulfates. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
9. Synthesis of 2-arylindoles by Suzuki coupling reaction of 3-bromoindoles with hindered benzoboronic acids.
- Author
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Yue, Guizhou, Wu, Yao, Wu, Caimei, Yin, Zhongqiong, Chen, Huabao, Wang, Xianxiang, and Zhang, Zuming
- Subjects
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SUZUKI reaction , *BORONIC acids , *PALLADIUM , *ELECTRON mobility , *ORGANIC synthesis - Abstract
A new synthetic method for 2-arylindoles has been developed, the process through Suzuki coupling reaction of 3-bromoindoles with hindered boronic acid catalyzed by Pd(OAc) 2 /PCy 3 , and a series of 2-arylindoles have been synthesized in moderate to high yields. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
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