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Search Results: 1 - 10 of 55114 matches for " TAO Chang-yuan "
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Optimization of reaction conditions for the electroleaching of manganese from low-grade pyrolusite
Xing-ran Zhang,Zuo-hua Liu,Xing Fan,Xin Lian,Chang-yuan Tao
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1176-x
Abstract: In the present study, a response surface methodology was used to optimize the electroleaching of Mn from low-grade pyrolusite. Ferrous sulfate heptahydrate was used in this reaction as a reducing agent in sulfuric acid solutions. The effect of six process variables, including the mass ratio of ferrous sulfate heptahydrate to pyrolusite, mass ratio of sulfuric acid to pyrolusite, liquid-to-solid ratio, current density, leaching temperature, and leaching time, as well as their binary interactions, were modeled. The results revealed that the order of these factors with respect to their effects on the leaching efficiency were mass ratio of ferrous sulfate heptahydrate to pyrolusite > leaching time > mass ratio of sulfuric acid to pyrolusite > liquid-to-solid ratio > leaching temperature > current density. The optimum conditions were as follows: 1.10:1 mass ratio of ferrous sulfate heptahydrate to pyrolusite, 0.9:1 mass ratio of sulfuric acid to pyrolusite, liquid-to-solid ratio of 0.7:1, current density of 947 A/m2, leaching time of 180 min, and leaching temperature of 73°C. Under these conditions, the predicted leaching efficiency for Mn was 94.1%; the obtained experimental result was 95.7%, which confirmed the validity of the model.

Chen Chang-yuan,

中国物理 B , 2000,
Abstract: In this paper, the general formulas and the recurrence formulas for radial matrix elements of N-dimensional isotropic harmonic oscillator are obtained. The relevant results of 2- dimensional and 3- dimensional isotropic harmonic oscillators reported in the reference papers are contained in a more general equations derived in this paper as special cases.

XIANG Bin,XING Shao-hua,LI Xue-ming,TAO Chang-yuan,ZHANG Sheng-tao,

腐蚀科学与防护技术 , 2005,
Abstract: The corrosion of tubes and tube sheets for a chlorine gas condenser in a chemical plant was studied using industrial computer tomography(ICT).ICT can not only detect whether are there gaps or interstices,but also quantitatively describe their size,shape and position.The ICT scan results indicated that the joint zone of the condenser baffle,condenser tubes and the welds are the sites suffered from serious corrosion damage.The condenser baffle in the side of brine presents a honeycombed surface and the pitting corrosion in the side of chlorine is much serious than that in the side of brine.ICT can effectively evaluate the corrosion of materials.
Alkaline pretreatment for chlorine removal from high-chlorine rhodochrosite
Xing-ran Zhang,Zuo-hua Liu,Wen-sheng Li,Ya-ya Cheng,Jun Du,Chang-yuan Tao
- , 2016, DOI: https://doi.org/10.1007/s12613-016-1346-5
Abstract: Chloride in manganese ore adversely affects mineral extraction. The mechanisms and the factors that influence an alkali pretreatment to removal chlorine from manganese ore were explored to eliminate hazards posed by chlorine during the electrolysis of manganese. The results showed that sodium carbonate, when used as an alkaline additive, promoted the dissolution of insoluble chloride, enhanced the migration of chloride ions, and effectively stabilized Mn2+. The optimal conditions were a sodium carbonate concentration of 0.45 mol·L?1, a liquid-solid ratio of 5:1 mL·g?1, a reaction time of 1 h, and a temperature of 25°C. The chlorine removal efficiency was greater than 95%, and the ore grade (Mn) was increased by 2.7%.
Matching the 'Knowing what to do' and the 'Doing what you Know' in Ethical Decision-making
Chang-Yuan Loh,Jin Boon Wong
Australasian Accounting Business and Finance Journal , 2009,
Abstract: Corporate events in the past decades have contributed to a continued interest in the ethicaldecision-making of individuals in accounting. Much of the research in ethics and educationhave relied on the assumption that the individual’s level of ethical development is related tohis/her ethical behavior. Adapting a simplified version of Thorne’s (2000)prescriptive/deliberative reasoning in a cheat-to-gain business scenario, a survey of accountingstudents suggest that ethical development may not be related to behavior. In addition,consistent with Thorne (2001), results suggest that even if individuals may ‘know what to do’for the ideal ethical decision, they may not always actually choose that path or ‘doing whatthey know’.
Water source, quality and aquatic environment protection of Dongjiang River

LU Yin-Tao,TANG Chang-Yuan,CHEN Jian-Yao,LI Fa-Dong,SAKURA Yasuo,

中国生态农业学报 , 2008,
Abstract: 为了解东江河水的来源和水质状况,沿东江干流采集河水样品,分析河水中的主要离子浓度以及氢和氧的同位素比。结果表明,河水氢同位素比(6D)为一48.9‰~-39.8‰,氧同位素比(δ^18O)为-6.3‰~-5.7‰。根据氢氧同位素的相关关系,以河源市和汝湖镇为界,将研究范围内的东江干流分为Ⅰ、Ⅱ和Ⅲ段。Ⅰ段和Ⅱ段河水主要来自流域内的大气降水,由于河水与含有较高氧同位素比的岩石发生氧元素交换,使Ⅱ段河水呈现氧同位素漂移。Ⅲ段河水主要来自象头山和罗浮山山区的降雨并通过地下水补给。由于河水本身的稀释作用,东江河水中各离子浓度很低。人类活动相对频繁的东江下游的离子总量远大干上游和中游地区,说明人类活动对东江河水存在着潜在的影响。东江河水的污染来源可分为点源污染和面源污染,针对这两种污染分别提出了相应的措施。另外,香港饮用水与北部山区的地下水有密切关系,为保持香港水源的良好水质,应把保护北部山区的地下水列为战略重点。
Study on Ultrasound-Assisted Decolorization of Methyl Orange with Fenton Reagent

TAO Chang-yuan,LIU Zuo-hu,LI Xiao-hong,DU Jun,SI Xiu-jie,ZHU Jun,

环境科学 , 2005,
Abstract: Employed with ultrasound, Fenton reagent, ultrasound-Fenton methods, performance and mechanism of decolorization and COD removal were investigated for methyl orange. Results indicated that little decolorization phenomenon was observed with ultrasound solely. For 400mg/L methyl orange solution, 67.51% decolorization ratio and 63.15% COD removal ratio were obtained with Fenton reagent for 30 min. Combined the same operation conditions with ultrasonic field, decolorization ratio and COD removal ratio are 86.91% and 80.32%, respectively. Ultrasound and Fenton reagent have synergistic action on degradation of methyl orange solution. It is oxidative reaction for methyl orange solution with Fenton reagent in strong acidic condition, and it is reduction process for the degradation when pH>5.
Removal of PAEs by Combined Activated Carbon-Fenton Process

SUN Da-gui,TAO Chang-yuan,LIU Zuo-hu,DU Jun,LIU Ren-long,

环境科学 , 2007,
Abstract: Removal of PAEs by combined process of activated carbon-Fenton was investigated. Factors associated with PAEs removal ratio following amount of activated carbon, dosages of oxidant, catalyst, initial concentration of PAEs, pH value and reaction time were studied. Results showed that high purification performance could be obtained by the synergetic effect of Fenton reagent and activated carbon. Average removal ratio of PAEs was 99.1% for the solution containing 12 mg x L(-1) DMP, DEP, DBP, DOP respectively by the activated carbon-Fenton process for 15 h.


物理学报 , 2000,
Abstract: 推导出三维各向同性谐振子径向矩阵元〈nl|rp|n′l′〉所满足的递推关系
Strange Attractors in Nonlinear Time-delay Neural Systems
Shyan-Shiou Chen,Chang-Yuan Cheng
Lecture Notes in Engineering and Computer Science , 2009,
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