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Applied technique of the cemented fill with fly ash and fine-sands

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Journal of Central South University 2001年第3期13卷 189-192页

作者： WANG Xin-ming,LI Jian-xiong,FAN Ping-zhi (college of Resources, Environment and Civil engineering, Central South Universi ty, changsha 410083.{3.) 1. college of Resources Environment and Civil Engineering Central South University 410083 Changsha China

Traditional stabilization of backfilling material is done by using Portland cement. However, the high price of cement forced mining engineer s to seek cheaper binding materials. Fly ash, which is the indus- trial wast e from thermal power plant, possess the potential activity of jellification, and can b e used in cemented fill as a partial substitute for cement to reduce the fill co s t. Tests were done during the past few years in Xinqiao Pyrite Mine and Phoenix Copper Mine to determine the technology parameters and the suitable content of f ly ash. Specimens with different cement/fly/ash tailings (sands) ratios were tes ted to obtain the strength values of the fill mass based on the analyses of both the chemical composition and physical and mechanical properties of fly ash . The compressive strength of specimens with a ratio of 1∶2∶8 (cement to fly ash to tailings ) can reach 2 MPa after 90 d curing, totally meeting the requiremen t of artificial pillar and reducing the fill cost by 20%-3.%.

关键词： fly ash cementing agent cemented fill replacement

Effect of Anodization on the Graphitization of PAN-based Carbon Fibers of PAN-based Carbon Fibers

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 926-930页

作者：贺冬枚蔡青云 State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan University

One-step pretreatment,anodization,is used to activate the polyacrylonitrile （PAN）-based carbon fibers instead of the routine two-step pretreatment,sensitization with SnCl2 and activation with *** effect of the anodization pretreatment on the graphitization of PAN-based carbon fibers is investigated as a function of Ni-P *** PAN-based carbon fibers are anodized in H3.O4 electrolyte resulting in the formation of active sites,which thereby facilitates the following electroless Ni-P *** fibers in the presence and absence of Ni-P coatings are heat treated and the structural changes are characterized by X-ray diffraction and Raman spectroscopy,both of which indicate that the graphitization of PAN-based carbon fibers are accelerated by both the anodization treatment and the catalysts *** the anodized carbon fibers,the routine two-step pretreatment,sensitization and activation,is not needed.

关键词： anodization X-ray diffraction raman spectroscopy graphitization

Ribozyme probe based on molecular beacon for real time monitoring of enzymatic cleavage process

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Chinese Science Bulletin 2003年第23期48卷 2581-2584页

作者： MENG Xiangxian, WANG Kemin, TAN Weihong, LI Jun, TANG Zhiwen, GUO Qiuping, HUANG Shasheng & LI Du State Key Laboratory of Chemo/Biosensing and Chemometrics, Institute of Biological Technology, college of chemistry and chemical Engi-neering, Hunan University,{3., china Correspondence should be addressed to Wang Kemin (e-mail: kmwang @***) State Key Laboratory of Chemo/Biosensing and Chemometrics Institute of Biological Technology College of Chemistry and Chemical Engineering Human University

Ribozyme probe based on molecular beacon (MBR) for monitoring enzymatic cleavage process in real time is designed and studied. The approach relies on ri-bozyme substrates modified at the two arms, with a fluores-cent moiety attached to the end of one arm and a non-fluorescent quenching moiety attached to the end of the other arm. MBR is employed to directly convert the cleavage information into fluorescence signal in real time. Compared with traditional approach, this method provides a no-radiolabeling, sensitive and effective way to research on the ribozyme activity, enzymatic dynamic process and ri-bozyme function during gene therapy. The activity of the ribozyme against hepatitis C virus RNA (HCV-RNA) is stud-ied based on this assay.

关键词：酶探测器分裂过程动力学酶活性基因治疗肝炎

Sol-gel synthesis and photoluminescence characterization of La_2Ti_2O_7:Eu^(3.) nanocrystals

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Rare Metals 2011年第6期30卷 602-606页

作者： CHENG Hua LU Zhouguang LIU Ying YANG Haihua GU Yingying LI Wei TANG Yougen college of chemistry ＆ chemical {3.ing Central South University Changsha 410083 China

Eu3. doped La2Ti2O7 nanocrystals with pure monoclinic phase and size of about 100 nm were prepared by a citric acid （CA） assisted sol-gel method. Techniques of thermo-gravimetric （TG） and differential scanning calorimetry （DSC）, X-ray diffraction （XRD）, as well as transmission electron microscopy （TEM） were employed to characterize the as-synthesized nanoparticles. Furthermore, photoluminescence （PL） performances of the Eu3. doped La2Ti2O7 nanocrystals were evaluated with focus on the effects of calcination temperature and Eu3. doping concentration on the photoluminescence properties.

关键词： lanthanum titanate rare earth metals photoluminescence nanophosphors pechini citric acid sol-gel

Characterization of Yeast Cells as a Microencapsulation wall Material by Fourier Transform Infrared Spectroscopy

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Characterization of Yeast Cells as a Microencapsulation wall...

Removal of Mercury and Cadmium Ions from Aqueous Solutions by a Complexation-ultrafiitration Process

2008年全国生物化学与分子生物学学术大会

作者： Guo-rong Shi~1 Li-qun Rao~2 Jun Zeng~1 Qing-ji Xie~3.Jun Li~1 Ben-xiang Li~1 1 college of Science,Hunan Agricultural University.changsha 410128 2 college of Bioscience and Biotechnology Hunan Agricultural University,changsha 410128 3.Key Laboratory of chemical Biology and Traditional Chinese Medicine Research.(Ministry of Education of china),college of chemistry and chemical engineering,Hunan Normal University,changsha 410081

The encapsulation properties and chemically-induced structural changes of yeast cells as a wall material for the microencapsulation of chlorogenic acid(CGA)were investigated by the Fourier transform infrared(FT-IR) spectroscopy and high-performance liquid chromatography(HPLC).Results indicate that the encapsulation performance of *** cells was largely affected by the composition of the culture medium,and the

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Removal of Mercury and Cadmium Ions from Aqueous Solutions b...

SOLUBILITY PREDICTION OF THE QUATERNARY SYSTEM CaSO4-MgSO4-H2SO4-H2O AT TEMPERATURES FROM 298.15 TO 3.3.15 K

The 12th Asian Pacific Confederation of chemical engineering Congress

作者： Jian-Xian Zeng~a Hong-Qi Ye~b Zhong-Yu Hu~a a college of chemistry and chemical {3.ing Hunan University of Science and Technology Xiangtan 411201 china b college of chemistry and chemical {3.ing Central South University changsha 410083.china

＜正＞Complexation-ultrafiltration process was investigated for removal of mercury and cadmium i- *** process included the addition of poly （ acrylic acid） sodium salt （PAASS） as a water sol- uble polymer to bind ... 详细信息

关键词： complexation ultrafiltration poly(acrylic acid)sodium salt Mercury cadmium

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SOLUBILITY PREDICTION OF THE QUATERNARY SYSTEM CaSO4-MgSO4-H...

思维策略训练对高中生化学问题解决能力影响的实验研究

第15届溶解度现象及相关相平衡过程国际会议

作者： Wang W.and Zeng D.college of chemistry and chemical {3.ing Central south university changsha 410083.P.R.china

＜正＞Hydrometallurgical processes of nickel often generate a plenty of waster liquid containing magnesium sulfate. On recovering magnesium sulfate by condensation at high temperatures, scale appears on the wall of ev...

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心理科学 2004年第5期27卷 1049-1051页

作者：吴鑫德张庆林陈向阳湖南师范大学长沙410081 西南师范大学重庆400715

研究思维策略训练对于高中生解决化学计算问题的有效性。被试为 1 61 6名高中学生 ,训练由经过培训的 1 7名高中化学教师承担 ,时间为 1 0周 ,实验采用自编的《高中生化学计算问题解决思维策略训练教程》及《自我提示卡》 ,在真实的课... 详细信息

研究思维策略训练对于高中生解决化学计算问题的有效性。被试为 1 61 6名高中学生 ,训练由经过培训的 1 7名高中化学教师承担 ,时间为 1 0周 ,实验采用自编的《高中生化学计算问题解决思维策略训练教程》及《自我提示卡》 ,在真实的课堂教学情境和正常的教学秩序下进行 ,以探索化学学科问题解决思维策略训练的有效性。结果表明 :思维策略训练能显著地提高高中生的化学计算问题解决能力 ,且普通中学高中生的训练效果明显优于重点中学。

关键词：思维策略训练高中生化学问题解决能力教育心理学思维心理学实验训练

以密度泛函论与局域近似法及改进过渡态计算软硬度

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西南师范大学学报（自然科学版） 2005年第1期30卷 108-112页

作者：张梦军覃仁辉黄莺李志良第三军医大学检验系重庆400038 重庆大学化学化工学院应用化学系重庆400044 湖南中医学院药学分院湖南长沙410007

应用密度泛函论(DFT)及其局域近似法(LDA)、局域近似法加全域性校正(LDB: LDA GCE)和改进斯莱特过渡态法(MST), 并依能量型标度定义, 采用有限差分法(DDM), 同时考虑相对论效应, 对元素电离能 P和电子亲合能Q 及原子软硬度U等进行精确... 详细信息

应用密度泛函论(DFT)及其局域近似法(LDA)、局域近似法加全域性校正(LDB: LDA GCE)和改进斯莱特过渡态法(MST), 并依能量型标度定义, 采用有限差分法(DDM), 同时考虑相对论效应, 对元素电离能 P和电子亲合能Q 及原子软硬度U等进行精确估计与理论预测. 把计算扩展到全部 112 种元素, 计算值相当文献值水平或优于其它近似泛函法, 更接近实验值. 该U值在分子模建与设计等方面将获广泛应用.

关键词：软硬度元素电离能电子亲合能密度泛函理论局域密度近似全域性校正改进过渡态法有限差分法