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Interfacial heat transfer coefficient between metal and die during high pressure die casting process of aluminum alloy

GUO Zhipeng, XIONG Shoumei, CHO SangHyun, CHOI JeongKil

《机械工程前沿(英文)》 2007年 第2卷 第3期   页码 283-287 doi: 10.1007/s11465-007-0049-z

摘要: The present work focused on the determination of the interfacial heat transfer coefficient (IHTC) between metal and die during the high pressure die casting (HPDC) process. Experiments were carried out on an aluminum alloy, ADC12Z, using step shape casting so-called because of its shape. The IHTC was successfully determined by solving one of the inverse heat problems using the nonlinear estimation method first used by Beck. The calculation results indicated that the IHTC immediately increased after liquid metal was brought into the cavity by the plunger and decreased as the solidification process of the liquid metal proceeded. The liquid metal eventually solidified completely, a condition when the IHTC tended to be stable. Casting thickness played an important role in affecting the IHTC between the metal and die not only in terms of its value but also in terms of its change tendency. Also, under the test conditions, different change tendencies of the metal solid fraction were found between castings with different thicknesses and the die.

关键词: so-called     calculation     inverse     interfacial     aluminum    

Review of SO42-/MxOy solid superacid catalysts

Yanni WU, Shijun LIAO

《化学科学与工程前沿(英文)》 2009年 第3卷 第3期   页码 330-343 doi: 10.1007/s11705-009-0208-3

摘要: Some metal oxides modified with sulfate ions form highly acidic or superacidic catalysts. solid superacid catalysts, play a vital role in more and more fields such as organic synthesis, fine chemicals, pharmaceuticals, and means for strengthening environmental safeguards. This review highlights the recent development of solid superacid catalysts based on , including synthesis method, characterization of acid sites and acid strength, and applications.

关键词: solid superacid catalyst     synthesis method     characterization     applications    

Performance and mechanism of carbamazepine removal by FeS-SO process: experimental investigation and

《环境科学与工程前沿(英文)》 2023年 第17卷 第9期 doi: 10.1007/s11783-023-1713-1

摘要:

● Synergistic removal of carbamazepine (CBZ) was obtained in the FeS-S2O82– process.

关键词: FeS     S2O82–     Carbamazepine     DFT calculations     Degradation routes    

What have we known so far for fluorescence staining and quantification of microplastics: A tutorial review

Shengdong Liu, Enxiang Shang , Jingnan Liu , Yining Wang , Nanthi Bolan , M.B. Kirkham , Yang Li

《环境科学与工程前沿(英文)》 2022年 第16卷 第1期   页码 8-8 doi: 10.1007/s11783-021-1442-2

摘要: Understanding the fate and toxicity of microplastics (MPs,<5 mm plastic particles) is limited by quantification methods. This paper summarizes the methods in use and presents new ones. First, sampling and pretreatment processes of MPs, including sample collection, digestion, density separation, and quality control are reviewed. Then the promising and convenient staining procedures and quantification methods for MPs using fluorescence dyes are reviewed. The factors that influence the staining of MPs, including their physicochemical properties, are summarized to provide an optimal operation procedure. In general, the digestion step is crucial to eliminate natural organic matter (NOM) to avoid interference in quantification. Chloroform was reported to be the most appropriate solvent, and 10–20 μg/mL are recommended as optimal dye concentrations. In addition, a heating and cooling procedure is recommended to maintain the fluorescence intensity of MPs for two months. After staining, a fluorescence microscope is usually used to characterize the morphology, mass, or number of MPs, but compositional analysis cannot be determined with it. These fluorescence staining methods have been implemented to study MP abundance, transport, and toxicity and have been combined with other chemical characterization techniques, such as Fourier transform infrared spectroscopy and Raman spectroscopy. More studies are needed to focus on the synthesis of novel dyes to avoid NOM’s interference. They need to be combined with other spectroscopic techniques to characterize plastic composition and to develop image-analysis methods. The stability of stained MPs needs to be improved.

Visbreaking of heavy petroleum oil catalyzed by SO/ZrO solid super-acid doped with Ni or Sn

JING Ping, LI Qingbiao, HAN Mei, SUN Daohua, JIA Lishan, FANG Weiping

《化学科学与工程前沿(英文)》 2008年 第2卷 第2期   页码 186-190 doi: 10.1007/s11705-008-0035-y

摘要: SO/ZrO solid super-acid catalysts (SZ) doped with Ni or Sn (Ni/SZ, Sn/SZ) were prepared for catalytic visbreaking of heavy petroleum oil from Shengli oil field. The visbreaking reactions were carried out at 240°C and 3–4 MPa for 24 h using a heavy petroleum oil to catalyst mass ratio of 100 : 0.05. The effect of water content on viscosity of heavy petroleum oil was also investigated. Both catalysts can promote thermolysis of heavy petroleum oil and the viscosity was reduced from 0.319 Pa·s to 0.135 Pa·s for Ni/SZ and 0.163 Pa·s for (Sn/SZ) with visbreaking rates of 57.7% and 48.9%, respectively. After visbreaking, the saturated hydrocarbon content increased while aromatics, resin, asphaltene, sulfur and nitrogen content decreased. The presence of water was disadvantageous to visbreaking of heavy petroleum oil.

关键词: thermolysis     Shengli     asphaltene     SO/ZrO     presence    

凝变除湿复合烟气深度净化技术工程应用 Article

刘建民, 朱法华, 马修元

《工程(英文)》 2018年 第4卷 第3期   页码 416-420 doi: 10.1016/j.eng.2018.05.009

摘要:

湿法脱硫后湿烟气排放会形成湿烟羽现象,不仅浪费水资源,产生视觉污染,同时湿烟气中的SO3、溶解在液态水中的盐、颗粒物等在大气环境中会形成二次污染。middot;kg-1·℃-1,在烟气温度降低1.5~5.3℃时,可回收烟气中5%~20%的水分,有效节约水资源;显著减少水汽排放,有效消除湿烟羽现象;离子浓度降低65%以上,SO3

关键词: 湿烟羽     凝变除湿     溶解盐     SO3     颗粒物    

Preparation and characterization of SO42-/TiO2 and S2O82-/TiO2 catalysts

MA Xuedan, GUO Daishi, JIANG Qizhong, MA Zifeng, MA Zhengfei, YE Weidong, LI Chunbo

《化学科学与工程前沿(英文)》 2007年 第1卷 第1期   页码 45-49 doi: 10.1007/s11705-007-0009-5

摘要: Nanosized solid superacids SO/TiO and SO/TiO, as well as MCM-41-supported SO/ZrO, were prepared. Their structures, acidities, and catalytic activities were investigated and compared using XRD, N adsorption-desorption, and in situ FTIR-pyridine adsorption, as well as an evaluation reaction with pseudoionone cyclization. The results showed that SO/TiO and SO/TiO possess not only nanosized particles with diameters <7.0 nm, a BET surface greater than 140 cm/g and relatively regular mesostructures with pores around 4.0 nm, but also a pure anatase phase and strong acidity. Different from the Lewis acid nature of SO/ZrO/MCM-41, SO/TiO and SO/TiO exhibit mainly Br¢nsted acidities. The strongest Br¢nsted acid sites were produced on SO/TiO promoted with HSO, while Lewis acid sites on SO/TiO even stronger than those on SO/ZrO/MCM-41 were generated when persulfate solution was used as sulfating agent. Because of their distinct acid natures, SO/TiO and SO/TiO exhibited catalytic activities for the cyclization of pseudoionone that were much higher than that of SO/ZrO/MCM-41. It can be concluded that the existence of more Br¢nsted acid sites was favorable for proton participation in the cyclization reaction.

关键词: exhibit     Different     persulfate     adsorption-desorption     catalytic    

What have we known so far about microplastics in drinking water treatment? A timely review

《环境科学与工程前沿(英文)》 2022年 第16卷 第5期 doi: 10.1007/s11783-021-1492-5

摘要:

• 23 available research articles on MPs in drinking water treatment are reviewed.

关键词: Microplastics     Drinking water treatment     Coagulation     Flocculation     Membrane     Filtration    

A combination process of mineral carbonation with SO2 disposal for simulated flue gas by magnesia-added

Yingying Zhao, Mengfan Wu, Zhiyong Ji, Yuanyuan Wang, Jiale Li, Jianlu Liu, Junsheng Yuan

《化学科学与工程前沿(英文)》 2019年 第13卷 第4期   页码 832-844 doi: 10.1007/s11705-019-1871-7

摘要: The desulfurization by seawater and mineral carbonation have been paid more and more attention. In this study, the feasibility of magnesia and seawater for the integrated disposal of SO and CO in the simulated flue gas was investigated. The process was conducted by adding MgO in seawater to reinforce the absorption of SO and facilitate the mineralization of CO by calcium ions. The influences of various factors, including digestion time of magnesia, reaction temperature, and salinity were also investigated. The results show that the reaction temperature can effectively improve the carbonation reaction. After combing SO removal process with mineral carbonation, Ca removal rate has a certain degree of decrease. The best carbonation condition is to use 1.5 times artificial seawater (the concentrations of reagents are 1.5 times of seawater) at 80°C and without digestion of magnesia. The desulfurization rate is close to 100% under any condition investigated, indicating that the seawater has a sufficient desulfurization capacity with adding magnesia. This work has demonstrated that a combination of the absorption of SO with the absorption and mineralization of CO is feasible.

关键词: mineral carbonation     wet SO2 disposal     seawater     desulfurization    

洁净煤技术的新发展——一种火电厂SO2的资源化技术

肖文德,袁渭康

《中国工程科学》 2000年 第2卷 第5期   页码 77-83

摘要: 作者提出了一种以合成氨为基础的新氨法(NADS),回收烟气中的SO2,生产硫酸铵、磷酸铵或硝酸铵化肥,并联产工业浓硫酸,已在2.5万kW机组试验成功,建立了计算机模拟软件。

关键词: 烟气脱硫     洁净煤技术     二氧化硫     电厂         化肥    

脉冲电晕等离子体烟气脱硫工业试验研究

赵君科,王保健,任先文,朱祖良

《中国工程科学》 2002年 第4卷 第2期   页码 74-78

摘要:

利用建造在四川绵阳科学城热电厂的最大烟气处理量为20000 m3/h的脉冲电晕等离子体烟气脱硫工业中试装置,研究了影响脱硫效率的因素,获得了最佳工艺参数。究结果表明,当烟气温度在65~70℃,烟气水分含量约10%,氨硫化学剂量比为1∶1,烟停留时间大于6 s、能耗低于5 Wh/Nm3等条件下,脱硫率达85%以上。

关键词: 脉冲电晕放电     脱硫     工业中试    

Long-term effects of various types of 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors on changes in glomerular filtration rate in Korea

Seo Yeon Baik, Hyunah Kim, So Jung Yang, Tong Min Kim, Seung-Hwan Lee, Jae Hyoung Cho, Hyunyong Lee,

《医学前沿(英文)》 2019年 第13卷 第6期   页码 713-722 doi: 10.1007/s11684-018-0661-9

摘要: Few long-term follow-up studies have compared the changes in renal function according to the type of statin used in Korea. We compared the long-term effects of statin intensity and type on the changes in the glomerular filtration rate (GFR). We extracted data of patients who took statin for the first time. We analyzed whether or not different statins affect the changes in GFR at 3 months after baseline and 4 years after. We included 3678 patients and analyzed the changes in GFR. The GFR decreased by 3.2%±0.4% on average 4 years after the first statin prescription, indicating statistically significant deterioration (from 83.5±0.4 mL/min/1.73 m to 79.9±0.4 mL/min/1.73 m , <0.001). When comparing the GFR among different statins, significant differences were observed between atorvastatin and fluvastatin (−5.3%±0.7% vs. 1.2%±2.2%, <0.05) and between atorvastatin and simvastatin (−5.3%±0.7% vs. −0.7%±0.8%, <0.05). In pitavastatin (odds ratio [OR]=0.64, 95% confidence interval [CI]=0.46–0.87, <0.005) and simvastatin (OR=0.69, 95% CI=0.53–0.91, <0.008), the GFR rate that decreased by<60 mL/min/1.73 m was significantly lower than that of atorvastatin. Regarding long-term statin intake, GFR changed with the type of statin. This work is the first in Korea to compare each statin in terms of changes in the GFR after the statin prescription.

关键词: statin     glomerular filtration rate     HMG-CoA reductase inhibitor     chronic kidney disease    

Removal of SO

Xiaolei LI, Chunying ZHU, Youguang MA

《化学科学与工程前沿(英文)》 2013年 第7卷 第2期   页码 185-191 doi: 10.1007/s11705-013-1326-5

摘要: In this work, the removal of SO from gas mixture with air and SO by ammonium bicarbonate aqueous solution as absorbent was investigated experimentally in a bubble column reactor. The effects of the concentration of ammonium bicarbonate, the SO inlet concentration of gas phase and the gas flow rate on the removal rate of SO were studied. The results showed that the higher the SO inlet concentration and the gas flow rate, the shorter the lasting time of SO completely removed in gas outlet, and then the faster the decrease in the removal rate of SO . The lasting time of SO completely removed in gas outlet increased with increasing ammonium bicarbonate concentration. During the process of SO absorption, there was a critical pH of solution. When the solution pH was less than the critical pH, it would sharply fall, resulting in a rapid decrease of the SO removal rate. A theoretical model for predicting the SO removal rate has been developed by taking the chemical enhancement and the sulfite concentration in the liquid phase into account simultaneously.

关键词: SO2 removal     bubble column reactor     removal rate     ammonium bicarbonate     absorbent    

脊髓损伤后基因表达和分子调控的系统研究

苏国辉

《工程(英文)》 2020年 第6卷 第4期   页码 389-390 doi: 10.1016/j.eng.2019.12.017

Regeneration of Fe

Ruizhuang ZHAO, Ju SHANGGUAN, Yanru LOU, Jin SONG, Jie MI, Huiling FAN

《化学科学与工程前沿(英文)》 2010年 第4卷 第4期   页码 423-428 doi: 10.1007/s11705-010-0503-z

摘要: Regeneration of a high-temperature coal gas desulfurization sorbent is a key technology in its industrial applications. A Fe O -based high-temperature coal gas desulfurizer was prepared using red mud from steel factory. The influences of regeneration temperature, space velocity and regeneration gas concentration in SO atmosphere on regeneration performances of the desulfurization sorbent were tested in a fixed bed reactor. The changes of phase and the composition of the Fe O -based high-temperature coal gas desulfurization sorbent before and after regeneration were examined by X-ray diffraction(XRD) and X-ray Photoelectron spectroscopy(XPS), and the changes of pore structure were characterized by the mercury intrusion method. The results show that the major products are Fe O and elemental sulfur; the influences of regeneration temperature, space velocity and SO concentration in inlet on regeneration performances and the changes of pore structure of the desulfurization sorbent before and after regeneration are visible. The desulfurization sorbent cannot be regenerated at 500°C in SO atmosphere. Within the range of 600°C – 800°C, the time of regeneration becomes shorter, and the regeneration conversion increases as the temperature rises. The time of regeneration also becomes shorter, and the elemental sulfur content of tail gas increases as the SO concentration in inlet is increased. The increase in space velocity enhances the reactive course; the best VSP is 6000 h for regeneration conversion. At 800°C, 20 vol-% SO and 6000 h , the regeneration conversion can reach nearly to 90%.

关键词: high-temperature coal gas     Fe2O3 desulfurization sorbent     SO2 atmosphere     regeneration behaviors     sulfur recovery    

标题 作者 时间 类型 操作

Interfacial heat transfer coefficient between metal and die during high pressure die casting process of aluminum alloy

GUO Zhipeng, XIONG Shoumei, CHO SangHyun, CHOI JeongKil

期刊论文

Review of SO42-/MxOy solid superacid catalysts

Yanni WU, Shijun LIAO

期刊论文

Performance and mechanism of carbamazepine removal by FeS-SO process: experimental investigation and

期刊论文

What have we known so far for fluorescence staining and quantification of microplastics: A tutorial review

Shengdong Liu, Enxiang Shang , Jingnan Liu , Yining Wang , Nanthi Bolan , M.B. Kirkham , Yang Li

期刊论文

Visbreaking of heavy petroleum oil catalyzed by SO/ZrO solid super-acid doped with Ni or Sn

JING Ping, LI Qingbiao, HAN Mei, SUN Daohua, JIA Lishan, FANG Weiping

期刊论文

凝变除湿复合烟气深度净化技术工程应用

刘建民, 朱法华, 马修元

期刊论文

Preparation and characterization of SO42-/TiO2 and S2O82-/TiO2 catalysts

MA Xuedan, GUO Daishi, JIANG Qizhong, MA Zifeng, MA Zhengfei, YE Weidong, LI Chunbo

期刊论文

What have we known so far about microplastics in drinking water treatment? A timely review

期刊论文

A combination process of mineral carbonation with SO2 disposal for simulated flue gas by magnesia-added

Yingying Zhao, Mengfan Wu, Zhiyong Ji, Yuanyuan Wang, Jiale Li, Jianlu Liu, Junsheng Yuan

期刊论文

洁净煤技术的新发展——一种火电厂SO2的资源化技术

肖文德,袁渭康

期刊论文

脉冲电晕等离子体烟气脱硫工业试验研究

赵君科,王保健,任先文,朱祖良

期刊论文

Long-term effects of various types of 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors on changes in glomerular filtration rate in Korea

Seo Yeon Baik, Hyunah Kim, So Jung Yang, Tong Min Kim, Seung-Hwan Lee, Jae Hyoung Cho, Hyunyong Lee,

期刊论文

Removal of SO

Xiaolei LI, Chunying ZHU, Youguang MA

期刊论文

脊髓损伤后基因表达和分子调控的系统研究

苏国辉

期刊论文

Regeneration of Fe

Ruizhuang ZHAO, Ju SHANGGUAN, Yanru LOU, Jin SONG, Jie MI, Huiling FAN

期刊论文