检索结果-南通市图书馆

MIBK Removal from Aqueous Solution by Aeration method

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2000年第4期12卷 182-185页

作者： li qing-gang ZHOU Kang-gen ZHANG Qi-xiu Metallurgical Separation Science and Engineering Lab. Central South UniversityChangsha 410083China

In order to develop an effective MIBK removal method of H 2TaF 7 solution in tantalum extraction process, MIBK removal from aqueous solution by the aeration method was investigated by using an aeration column with the dimensions of 78 mm in inner diameter and 1 100 mm in length. The effects of aeration conditions on aerating efficiency were investigated in the ranges of temperature 303 333 K, airflow rate 50 300 L/h,volume of solution 1 600 3 200 mL. Aerating efficiency increases with the increase of temperature and airflow rate. MIBK in aqueous solution can be removed from 0.058 mol/L to 0.002 mol/L at 50 ℃,airflow rate 200 L/h, volume of solution 2 400 mL and aeration time 1h. The experimental results show that MIBK can be removed effectively from aqueous solution by the aeration method.

关键词： tantalum niobium MIBK removal aeration method

Study on the Removal of MIBK from Aqueous Solution by Vacuum Membrane Distillation

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2000年第4期12卷 178-181页

作者： TANG Jian-jun ZHOU Kang-gen ZHANG Qi-xiu li qing-gang Metallurgical Separation Science and Engineering Lab. Central South UniversityChangsha 410083China

Methyl isobutyl ketone(MIBK) is widely used as extraction agent in hydrometallurgy. As it has a definite solubility in water, so when using MIBK as extraction agent, there will be MIBK in stripping solutions inevitably, which not only pollutes working conditions, but also affects the quality of ultimate product. In order to remove MIBK from aqueous solutions, the means of flat vacuum membrane distillation(VMD) is studied in the paper. The area of the membrane used in the study is 0.02 m 2, the initial volume of feed is 2 L, each experiment was conducted over a time period of 60 120 min. The influences of the factors such as temperature(34.8 55.0 ℃); pressure in the permeate side(10.67 14.67 kPa) and feed flow rate(27.8 69.4 mL/s) were experimentally studied. Increasing the temperature or reducing the pressure in the permeate side results in a faster removal of MIBK; however there is a decrease in removal factor β , increasing the feed flow rate results in a faster removal of MIBK and an increase of removal factor β , especially in the range of lower flow rate. The study indicates that the aim of MIBK removal and recycle from dilute aqueous solutions can be achieved by VMD.

关键词： vacuum membrane distillation methyl isobutyl ketone removal

FLOATING RATE OF FRAZIL ICE PARTICLES IN FLOWING WATER IN BEND CHANNELS——A THREE-DIMENSIONAL NUMERICAL ANALYSIS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2010年第1期22卷 19-28页

作者： WANG Jun li qing-gang SUI Jue-yi School of Civil Engineering Hefei University of Technology Hefei 230009 China Environmental Engineering Program University of Northern British Columbia British Columbia Canada V2N4V9

In this article, based on the theory of two-phase flow and laboratory data, a three-dimensionally model is developed to simulate the floating rates of frazil ice particles in water under covered condition. The Lagrangian trajectory method is used in the three dimensional simulation for floating rates of fxazil ice particles along a 180° bend channel. The velocity profiles in longitudinal and transverse directions, the turbulence intensity, and the residual pressure are simulated. Under the condition of gravitational similarity, the simulated floating rates of frazil ice particles in the model bend channel and the prototype bend channels are compared. Results indicate that the profiles for floating rates of ice particles for flows in the model channel are similar to those in the prototype bend channels. The simulated floating rates of ice particles are clearly higher along the convex bank than along the concave bank at each cross section. For the prototype bend channel in a large model scale, the variation of floating rate across each cross section is relatively small.

关键词： frazil ice particles model scale floating rate two-phase flow bend channel ice accumulation (ice jam)

Cloning, expression, and polymorphism of the ECI1 gene in various pig breeds

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2017年第8期16卷 1789-1799页

作者： LU Yun-feng CHEN Ji-bao ZHANG Bo li qing-gang WANG Zhi-xiu ZHANG Hao WU Ke-liang College of Animal Science and Technology China Agricultural University School of life Science and Technology Nanyang Normal University Institute of Animal Sciences and Veterinary Medicine Anhui Academy of Agricultural Sciences

The enzyme △3,△2-dienoyl-CoA isomerase （ECI1） plays a crucial role in the mitochondria113-oxidation of fatty acids with a double-bond in odd and even positions. The ECll gene might be a qualified candidate for studies pertaining to lipid deposition and meat quality in swine. In the present study, ECI1 cDNA of the Tibetan pig was obtained by in silico cloning and verified by PCR analysis. Single-nucleotide polymorphisms （SNPs） of ECll were screened by PCR-sequencing and genotypes of those SNPs were tested by PCR-restriction fragment length polymorphism （PCR-RFLP） in Diannan small-ear pigs （DSP, n=40）, Tibetan pigs （TP, n=60） and Yorkshire pigs （YP, n=30）. The expression levels of ECll were analyzed by real-time quantitative PCR and Western blotting in tissues of the liver, backfat, and Iongissimus dorsi （LD） muscle of DSP （n=8）, TP （n=8） and YP （n=8）. Single factor linear correlation analysis was applied separately for each breed to evaluate correlations between ECll gene expression in the LD muscle and intramuscular fat （IMF） content. We obtained an ECll gene length of 1 401 bp from the cDNA that contained a full coding region of 909 bp. Three novel SNPs （g.42425337G〉A; g.42424666A〉G; and g.42422755A〉G） were detected, and only g.42424666A〉G exhibited three genotypes among the three breeds. The ECll expression levels in the LD muscle of DSP and TP were significantly higher than that of YP （P〈0.05）. Moreover, TP had the highest ECI1 expression in backfat （P〈O.01）, and a positive correlation was observed between gene expression and IMF content. The results suggest that differences in ECI1 gene expression might be related to lipid depo- sition and meat quality in pig.

关键词： ECll gene lipid deposition mRNA expression pig single-nucleotide polymorphism Western blotting

Cloning and Sequence Analysis of Partial Exons of Sex Hormone Binding Globulin Gene in Pig

在线全文

学校读者我要写书评

暂无评论

Animal Husbandry and Feed Science 2010年第5期2卷 1-2,17页

作者： li qing-gang Research Institute of Husbandry and Veterinary Anhui Academy of Agricultural Sciences Hefei 230031 China

[Objedive] To clone the partial exons of sex hormone binding globulin （SHBG） gene in pig and provide experimental references for ac- curate separation and allocation of SHBG gene in pig. [Method] According to the sequences of SHBG gene in human and cow, one pair of primers was designed to amplify the DNA sequences of SHBG gene in pig, and the partial exons of SHBG gene were determined according to the principles of comparative genomics. Then the sequences and homology were analyzed. [ Result] The amplified SHBG gene was 841 bp in size, and its se- quences had 100.00% nucleotide homology to the CH242-411 E2 fragment on pig chromosome 12. The determined exon 4, exon 5 and exon 6 of SHBG gene were 162, 159 and 156 bp in size, respectively, and the amino acids sequences encoded by these three exons had 74.51% homology to that of human and 73.86% homology to that of cow, respectively. [ Conclusionl The partial exons of SHBG gene were determined successfully, which provides a basis for further research on the structure, accurate determination and allocation of SHBG gene in pig.

关键词： Sex hormone binding globulin Sequence analysis Pig

Electrodeposition of Copper by IMPC Method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University 2000年第4期12卷 186-190页

作者： ZHOU Kang gen,li qing gang,ZHANG Qi xiu (Metallurgical Separation Science and Engineering Lab., Central South University, Changsha 410083, China) Metallurgical Separation Science and Engineering Lab. Central South University Changsha China

In order to develop an energy saving electrodeposition process of copper, the electrodeposition of copper in copper sulfate solution by the ion exchange membrane primary cell (IMPC) method has been studied. The experiments were carried out in an ion exchange membrane primary cell with dimensions of 200 mm in length, 52 mm in width and 90 mm in height. The influences of temperature(294 323 K), interval between the anode and cathode (1.5 3.5 cm), mass concentrations of Cu 2+ (6 40 g/L), H 2SO 4(0 120 g/L) and Fe 3+ (3 9 g/L) in catholyte and solution flow rate (0 8 cm/s) on current density and current efficiency were investigated experimentally. The current density increases with the increase of temperature and concentrations of Cu 2+ and H 2SO 4 in catholyte. Cathode current efficiency decreases with the increase of concentration of Fe 3+ in catholyte and anode current efficiency decreases with the increase of temperature. The high quality cathodic copper can be obtained and the current density of membrane can be higher than 150 A/m 2 and the current density of cathode can be higher than 300 A/m 2. The experiment results show that IMPC method is effective for electrodeposition of copper.

关键词： ion exchange membrane primary cell copper electrodeposition

A Note to Hutton＇s Theorem

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical Research and Exposition 2008年第2期28卷 429-434页

作者： FU Wen qing li Sheng gang College of Mathematics and Information Science Shaanxi Normal University Shaanxi 710062 China

It is proved in this paper that there is a bijection φ from J∪J to δ∪δ′which satisfies：（1）φ｜J：（J,belong to）→（δ′,≤）is a frame isomorphism;（2）φ｜J^′：（J^′,belong to）→（δ＇,≤）is a coframe isomorphism,where J is the ordinary topology on[0,1],δis the ordinary L-topology on L-unit interval I（L）,and L is a frame with an order-reversing *** result improves Theorem 3 in Hutton＇s paper.

关键词： L-unit interval ordinary topology meet-preserving mapping join-preserving mapping

Study on Relationship Between Polymorphisms in FSHβ,ESR,PRLR Genes of A Novel Huai Pig line II and Its litter Size

在线全文

学校读者我要写书评

暂无评论

Animal Husbandry and Feed Science 2009年第6期1卷 5-9页

作者： li qing-gang liU lin-qing XU Jin-gen TAO li Institute of Animal Sciences and Veterinary Medicine Anhui Academy of Agricultural Sciences Hefei 230031 China Anhui Agricultural University Hefei 230036 China

tract By employing PCR-RFLP technique, we detected the polymorphisms in FSHβ, ESR, PRLR genes of a novel Huai pig line II （generation 1 ） and their effects on initial litter size, and analyzed the aggregation effect of multi-gene combined genotype on initial litter size. The results showed that the genotype frequencies of ESR and PRLR genes were in Hardy-Weinberg equilibrium other than the genotype frequency of FSHβ gene. Allele A of FSHβ, ESR and PRLR gene had a positive additive effect on reproductive traits. The favorable genotypes of FSHβ and ESR genes was AA- type, while in PRLR gene was AB-type in the 112 pig individuals detected. With regard to FSHβ and ESR genes, AA-type individuals＇ TNB of were respectively 1.54 （P 〈0.05） and 2.13 （P 〈 0.01 ） higher than the BB-type individuals＇; AA-type individuals＇ AN B of the two genes were respectively 1.55 （ P 〈 0.05） and 1.82 （ P 〈 0.01 ） higher than the BB-type individuals＇. Concerning PRLR gene, AB-type individuals＇ TNB was 0.77 （ P 〉 0.05 ） and 1.59（P〈0.05） higher than that of AA and BB-type individuals respectively, and ANB was 0.65（P〉0.05） and 1.8（ P〈0.01 ） higher than AA and BB-type individuals＇ respectively. Moreover, our results also showed that the AAAABB combination genotype of FSHβ , ESR, PRLR genes bore more than all other combination genotypes, but only 2 individuals were proved to be AAAABB genotype. Consequently, pyramiding FSHβ and ESR genes could to a large extent enhance TNB and NBA of individuals. Therefore, we advise, in next generation that those individuals with AAAA combination genotype of FSHβ and ESR should be selected to increase frequency of allele A, whether PRLR gene is proper for pyramiding with the other genes or not is still to be studied further.

关键词： FSHβ ESR PRLRI Novel Huai pig line II Utter size

Removal of impurities from scandium solutions by ion exchange

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University 2018年第12期25卷 2953-2961页

作者： PENG Zhen li qing-gang li Zhao-yang ZHANG Gui-qing CAO Zuo-ying GUAN Wen-juan Laboratory of Metallurgical Separation Science and Engineering School of Metallurgy and EnvironmentCentral South University National Engineering Laboratory for Efficient Utilization of Refractory Non-ferrous Metals Resources Central South University

A process of removing impurities,such as Fe,Zr,Ti,Al,Si,from scandium solution by ion exchange was *** resins’selectivity was studied in scandium chloride *** results indicated that D851resin had high selectivity of Sc at low acidity,and high selectivity of Zr at high acidity;D370resin had high selectivity of Fe and Si in high acidity.A new technical process of removing impurities from scandium chloride solution was proposed,which includes D370resin adsorbing Fe in high acidity,D851resin adsorbing Zr in medium acidity and D851resin adsorbing Sc at low *** experimental results show that removal rates of Al,Ca,Fe,Zr,Ti and Si,were100%,99.6%,100%,100%,99.5%and100%respectively.

关键词： scandium ion exchange separation adsorption