EFFECTS OF DISSOLVED MINERAL SPECIES ON THESURFACECHEMICALCHARACTERISTIC，ELECTROKINETICPROPERTYANDFLOTATIO

ＥＦＦＥＣＴＳＯＦＤＩＳＳＯＬＶＥＤＭＩＮＥＲＡＬＳＰＥＣＩＥＳＯＮＴＨＥＳＵＲＦＡＣＥＣＨＥＭＩＣＡＬＣＨＡＲＡＣＴＥＲＩＳＴＩＣ，ＥＬＥＣＴＲＯＫＩＮＥＴＩＣＰＲＯＰＥＲＴＹＡＮＤＦＬＯＴＡＴＩＯＮＢＥＨＡＶＩＯＲＯＦＦＬＵＯＲＩＴＥＡＮＤＳＣＨ...     

Second phases of rapidly solidified AlFeCrZrVSi alloy and their thermal stabilities

ＳＥＣＯＮＤＰＨＡＳＥＳＯＦＲＡＰＩＤＬＹＳＯＬＩＤＩＦＩＥＤＡｌＦｅＣｒＺｒＶＳｉＡＬＬＯＹＡＮＤＴＨＥＩＲＴＨＥＲＭＡＬＳＴＡＢＩＬＩＴＩＥＳＸｉａｏＹｕｄｅＬｉＳｏｎｇｒｕｉＬｉＷｅｎｘｉａｎＺｅｎｇＺｈｉｈｕａＭａＺｈｅｎｇｑｉｎｇ（Ｄｅｐａ...     

ISOTHERMAL KINETICS OF THE FIRST STAGE REDUCTION OF MAGNETITE COLD BOND PELLETS WITH CARBON MONOXIDE

ＩＳＯＴＨＥＲＭＡＬＫＩＮＥＴＩＣＳＯＦＴＨＥＦＩＲＳＴＳＴＡＧＥＲＥＤＵＣＴＩＯＮＯＦＭＡＧＮＥＴＩＴＥＣＯＬＤＢＯＮＤＰＥＬＬＥＴＳＷＩＴＨＣＡＲＢＯＮＭＯＮＯＸＩＤＥ＊ＣｈｅｎＱｉｙｕａｎＺｈｏｕＨｏｎｇＺｈａｎｇＰｉｎｇｍｉｎ（Ｄｅｐａｒｔｍ...     

SINGLE CRYSTAL GROWTH OF Cu BASED SHAPE MEMORYALLOYANDITSTHERMODYNAMICANALYSIS

ＳＩＮＧＬＥＣＲＹＳＴＡＬＧＲＯＷＴＨＯＦＣｕＢＡＳＥＤＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＡＮＤＩＴＳＴＨＥＲＭＯＤＹＮＡＭＩＣＡＮＡＬＹＳＩＳＳＩＮＧＬＥＣＲＹＳＴＡＬＧＲＯＷＴＨＯＦＣｕＢＡＳＥＤＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＡＮＤＩＴＳＴＨＥＲ...     

PREPARATION AND CLEAVAGE MECHANISM OF CHELATES OF METAL IONS WITH EDTA LINKED TO OLIGODEOXYRIBONUCLEOTIDES

ＰＲＥＰＡＲＡＴＩＯＮＡＮＤＣＬＥＡＶＡＧＥＭＥＣＨＡＮＩＳＭＯＦＣＨＥＬＡＴＥＳＯＦＭＥＴＡＬＩＯＮＳＷＩＴＨＥＤＴＡＬＩＮＫＥＤＴＯＯＬＩＧＯＤＥＯＸＹＲＩＢＯＮＵＣＬＥＯＴＩＤＥＳ＊ＬｉＸｉａｏｒｕ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ,...     

METALLOGENICCHARACTERISTICSANDORE－P

ＭＥＴＡＬＬＯＧＥＮＩＣＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＮＤＯＲＥ－ＰＲＯＳＰＥＣＴＩＮＧＦＵＴＵＲＥＯＦＰＲＥ－ＣＡＭＢＲＩＡＮＧＯＬＤＤＥＰＯＳＩＴＳＩＮＭＵＦＵ－ＪＩＵＬＩＮＧＤＩＳＴＲＩＣＴＷｕＹａｎｚｈｉ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏ...     

THELUBRICATINGMECHANISMA OFLUBRICAT

ＴＨＥＬＵＢＲＩＣＡＴＩＮＧＭＥＣＨＡＮＩＳＭＳＯＦＬＵＢＲＩＣＡＴＩＮＧＤＲＩＬＬＩＮＧＦＬＵＩＤＳＯＮＳＹＮＴＨＥＴＩＣＤＩＡＭＯＮＤＢＩＴＬｏｎｇＷｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴ...     

HYDROPHOBICITY－HYDROPHILICITY BALANCE RELATIONSHIPSFORCOLLECTORLESSFLOTATIONOFSULPHIDEMINERALS

ＨＹＤＲＯＰＨＯＢＩＣＩＴＹ－ＨＹＤＲＯＰＨＩＬＩＣＩＴＹＢＡＬＡＮＣＥＲＥＬＡＴＩＯＮＳＨＩＰＳＦＯＲＣＯＬＬＥＣＴＯＲＬＥＳＳＦＬＯＴＡＴＩＯＮＯＦＳＵＬＰＨＩＤＥＭＩＮＥＲＡＬＳＨＹＤＲＯＰＨＯＢＩＣＩＴＹ－ＨＹＤＲＯＰＨＩＬＩＣＩＴＹＢＡＬＡ...     

THE PULP ELECTROCHEMISTRY OF FLOTATION SEPARATION FOR STIBNITE-ARSENOPYRITE BULK CONCENTRATE

ＴＨＥＰＵＬＰＥＬＥＣＴＲＯＣＨＥＭＩＳＴＲＹＯＦＦＬＯＴＡＴＩＯＮＳＥＰＡＲＡＴＩＯＮＦＯＲＳＴＩＢＮＩＴＥ－ＡＲＳＥＮＯＰＹＲＩＴＥＢＵＬＫＣＯＮＣＥＮＴＲＡＴＥＯｕＬｅｍｉｎｇＦｅｎｇＱｉｍｉｎｇＣｈｅｎＪｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭｉｎｅ...     

RESEARCH OF FILM THICKNESS DURING DRAWING PROCESS LUBRICATED WITH O／W EMULSIONS~＋

ＲＥＳＥＡＲＣＨＯＦＦＩＬＭＴＨＩＣＫＮＥＳＳＤＵＲＩＮＧＤＲＡＷＩＮＧＰＲＯＣＥＳＳＬＵＢＲＩＣＡＴＥＤＷＩＴＨＯ／ＷＥＭＵＬＳＩＯＮＳ~＋￥ＹａｎＨｅｎｇｚｈｉ；ＺｈｏｎｇＪｕｅ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ?..     

Synthesis and characterization of 2-hydroxy-N-methyl-N-phenyl-acetamide

1　ＩＮＴＲＯＤＵＣＴＩＯＮ2 Ｈｙｄｒｏｘｙ Ｎ ｍｅｔｈｙｌ Ｎ ｐｈｅｎｙｌ ａｃｅｔａｍｉｄｅｉｓａｎｉｍｐｏｒｔａｎｔｉｎｔｅｒｍｅｄｉａｔｅｏｆｈｅｒｂｉｃｉｄｅｍｅｆｅｎａｃｅｔａｎｄｉｔｓｓｙｎｔｈｅｓｉｓｉｓｔｈｅｋｅｙｐｒｏｃｅｓｓｉｎｔｈｅ     

Selective recognition in molecularly imprinted polymer and its chromatographic characterization for cinchonine

A molecularly imprinting polymer (MIP) was synthesized via bulk polymerization under different conditions using anti-ague drug cinchonine (CN) as template. Infrared spectra (IR) results show that the template CN and functional monomer α-methyl acrylic acid (MAA) formed complexes before polymerization and the structure of complexes was simulated by Hyperchem. The results indicate that there are hydrogen bond or ionic bond between functional monomer and template molecule in acetonitrile solution. The MIP made in cold-initiated photo-polymerization has higher separation performance than that in the therm-initiated polymerization. The separation of the isomers CN and cinchonidine (CD) can be successfully obtained when its separate factor α reaches 1.82. Scatchard analysis suggests that the MIP recognizing CN with two classes of binding sites. The partition coefficient K _{d, 1} and apparent maximum number n _{max, 1} of binding sites with high affinity are 131.43 μmol/L and 58.90 μmol/g, respectively, while K _{d, 2} and n _{max, 2} of binding sites with low affinity are 2.32 mmol/L and 169.08 mmol/g, respectively. Foundation item: Project(2004035085) supported by the Postdoctoral Science Foundation of China; project(04JJ3080) supported by the Natural Science Foundation of Hunan Province     

Stability, detonation properties and pyrolysis mechanisms of polynitrotriprismanes C6H6-n（NO2）n （n=1-6）

To further test whether polynitriprismanes are capable of being potential high energy density materials (HEDMs), extensive theoretical calculations were carried out to investigate on a series of polynitrotriprismanes (PNNPs): C₆H_6−n (NO₂) _n (n=1−6). Heats of formation (HOFs), strain energies (SE), and disproportionation energy (DE) were obtained using B3LYP/6-311+G(2df, 2p)//B3LYP/6-31G* method by designing different isodesmic reactions, respectively. Detonation properties of PNNPs were obtained by the well-known KAMLET-JACOBS equations, using the predicted densities (ρ) obtained by Monte Carlo method and HOFs. It is found that they increase as the number of nitro groups n varies from 1 to 6, and PNNPs with n≥4 have excellent detonation properties. The relative stability and the pyrolysis mechanism of PNNPs were evaluated by the calculated bond dissociation energy (BDE). The comparison of BDE suggests that rupturing the C-C bond is the trigger for thermolysis of PNNPs. The computed BDE for cleavage of C-C bond (88.5 kJ/mol) further demonstrates that only the hexa-nitrotriprismane can be considered to be the target of HEDMs.     

Thermodynamic assessment of Au-Zr system

1　INTRODUCTIONChemicalvapordeposition (CVD)diamondholdsgreatpromiseinsolvingthermalmanagementprobleminhigh performancemulti chipmodules (MCMs) .However ,thismaterialdoespresentsometechnologi calchallenges ,onebeingthedevelopmentofreliablemetallizationsystems[1] .Thedesirablecharacteristicsofametallizationsystemare goodadhesiontothesubstrate ,lowstress ,goodelectricalconductivityandminimalreactionsatsubsequentprocessingtempera tures (upto 4 0 0℃ ) [2 ] .Goldisusuallychosenasthemetalfor…     

Synthesis and characterization of Nd doped M-type hexagonal barium ferrite ultrafine powders

Ｂｅｃａｕｓｅｐｅｒｍａｎｅｎｔｂａｒｉｕｍｆｅｒｒｉｔｅｍａｔｅｒｉａｌｐｏｓｓｅｓｓｅｓｒｅｌａｔｉｖｅｌｙｈｉｇｈｓａｔｕｒａｔｉｏｎｍａｇｎｅｔｉｚａｔｉｏｎ ,ｇｒｅａｔｃｏｅｒｃｉｖｅｆｏｒｃｅａｎｄｈｉｇｈｍａｇｎｅｔｉｃａｎｉｓｏｔｒｏｐｙｆｉｅｌｄａｓｗｅｌｌａｓｅｘｃｅｌｌｅｎｔｃｈｅｍｉｃａｌｓｔａｂｉｌｉｔｙａｎｄｃｏｒｒｏｓｉｏｎｒｅｓｉｓｔａｎｃｅ ,ｉｔｈａｓｂｅｅｎｗｉｄｅｌｙｕｓｅｄａｓｔｒａｄｉｔｉｏｎａｌｐｅｒｍａｎｅｎｔｍａｇｎｅｔｓ,ｈｉｇｈ ｄｅｎｓｉｔｙｍ…     

Synthesis and characterization of bismuth-doped tin dioxide nanometer powders

Bismuth-doped tin dioxide nanometer powders were prepared by co-precipitation method using SnCl4 and Bi（NO3）3 as raw materials. The effects of calcining temperature and doping ratio on the particle size, composition, spectrum selectivity of bismuth-doped tin dioxide and the phase transition of Bi-Sn precursor at different temperatures were studied by means of X-ray diffraction, transmission electron microscopy, ultraviolet-visual-near infrared diffuse reflection spectrum and the thermogravimetric-differential scanning calorimetry. The results show that prepared bismuth-doped tin dioxide powders have excellent characteristics with a single-phase tetragonal structure, good dispersibility, good absorbency for ultraviolet ray and average particle size less than 10 nm. The optimum conditions for preparing bismuth-doped tin dioxide nanometer powders are as follows： calcining temperature of 600℃, ratio of bismuth-doped in a range of 0. 10 - 0.30, and Bi-Sn precursor being dispersed by ultrasonic wave and refluxed azeotropic and distillated with mixture of n-butanol and benzene. The mechanism of phase transition of Bi-Sn precursor is that Bi^3＋ enters Sn-vacancy and then forms Sn-O-Bi bond.     

Thermoelectric properties of Ca3Co4O9 ceramics

Ca₃Co₄O₉ ceramics were prepared using the sol-gel process with ordinary pressing sintering and their thermoelectric properties were measured from room temperature to 673 K. The experimental results show that single phase Ca₃Co₄O₉ can be fabricated at 750–900 °C in different citrate acid molar proportions for 0.2–1.0. For all the oxides, both the Seebeck coefficients S and the electrical conductivities κ increase with the increasing temperature. The Seebeck coefficients S are all positive. The thermal conductivities k increase with the increasing temperature also and the lattice thermal conductivity κ _l plays an important role to the thermal conductivity κ. The citrate acid molar proportions have a large influence on the particle sizes, which influences the thermoelectric properties of the ceramics. The figure of merit increases with the increasing temperature and reaches 4.5×10⁻⁵ K⁻¹ at 573 K for the sample in the citrate acid molar proportion of 0.46.     

Magnetostrictive distortion in Pr0.15Tbx Dy0.85-xFe2 polycrystals by X-ray diffraction

The ingots of Pr0.15 Tbx Dy0.85-x Fe2 (x=0.10-0.85) series compounds with a single phase were prepared by a arc melting method. The X-ray diffraction patterns were measured using a Philips X‘pert MPD X-ray diffractometer with a non-ambient sample stage at different temperatures, the magnetostfictive distortion in Pr0.15 Tbx Dy0.85-x Fe2 polycrystals was investigated by X-ray diffraction patterns and the magnetostfiction coefficient λ111 was calculated. The results show when the temperature is raised above the spin reorientation temperature region, a splitting appears in the reflection (440); the λ111 increase with the increasing of Tb content for Pr0.15 Tbx Dy0.85-x Fe2 polycrystals and thefull width at half maximum (FWHM) of the reflection (440) increases gradually with the increasing of Tb content.Moreover, as the FWHM of the reflection (440) decreases gradually with the increasing of temperature, the λ111 decreases slightly with the increasing of temperature at the temperature region of 223 -373 K for Pr0.15 Tb0.3 Dy0.55 Fe2 alloy.     

Screening, identification and desilication of a silicate bacterium

The strain Lv（1- z） isolated from the Henan bauxite was characterized by morphological observation, biochemical and physiological identification, and 16S rDNA sequence analysis. The influences of temperature, initial pH value, the volume of medium, shaking speed and illite concentration on the desilicating ability of the strain Lv（1- z） were investigated. The results show that the bacterium is a Gram-negative rod-shaped bacterium with oval endspores and thick capsule, but without flagellum. The biochemical and physiological tests indicate that the strain Lv（1- z） is similar to Bacillus rnucilaginosus. In GenBank the 16S rDNA sequence similarity of the strain Lv（1- z） and the B. rnucilaginosus YNUCC0001（AY571332） is more than 99%. Based on the above results, the strain Lv（1- z） is identified as B. rnucilaginosus. The optimum conditions for the strain L（1- z） to remove silicon from illite are as follows., temperature is 30℃ ;initial pH value is 7.5; medium volume in 200 mL bottle is 60 mL; shaking speed of rotary shaker is 220 r/m ; illite concentration is 1%.