mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Technology and mechanism of desilication from roasted diasporic bauxite in atmosphere

The leaching desilication technology of roasted diasporic bauxite in atmosphere by caustic soda solution was investigated. The optimum parameters were: the grinding fineness of the roasted bauxite - 0.076 mm and 80 % ~85 %, leaching time 2 h, Na_2O_k,100~150g/L, L/S4 -5, leaching temperature 90 - 95 ℃ The desilication rate 55.20% and concentrate A/S (mass ratio of A1_2O_3 to SiO_2) 9.90, as good as those obtained at pressure,  were obtained respectively. Investigation of two-stage leaching shows that it can both improve desilication rate of roasted ore and reduce leaching time. When time of the first stage and the second stage is 30min and 30min respectively, desilication rate can reach 59.65% . X-ray diffraction analysis of the concentrate has proved that desilication procedure is accompanied with the formation of sodium aluminosilicate hydrate. X-ray spectra also show that silica removed during leaching is amorphous silica. SiO_2 oc-curring as quartz in raw ore or mullite formed during roasting can not dissolve in alkali solution.
Synthesis and thermal decomposition kinetics of LiNiO_2

A layered LiNiO_2 with high crystallinity was synthesized by sintering the finely prepared mixture of lithium hydroxide and nickel hydroxide in the oxygen atmosphere. The electro-chemical properties of LiNiO_ show that it has a reversible capacity of more than 168 mA·h·g~(-1). It was found that with increasing temperature, LiNiQj decomposed in air followed with three reaction stages, the apparent activation energies were 747.18 ± l.OkJ·mol~(-1), 932.46 ± 1.0 kJ·mol~(-1) and 1126.97 ± 1.0 kJ·mol~(-1) respectively, and the kinetic equations of the three reaction stages were obtained.
Relationship between solid fraction of slurry and property of steel/mushy Al-20Sn semi-solid bonding

The slurry of Al-20Sn alloy was prepared using electromagnetic-mechanical stirring method. The bonding of steel/mushy Al-20Sn was conducted using casting rolling technique. The bonding parameters were 505 t for preheat tem-perature of sleel plate and 10 mm/s for rolling speed. The interfacial mechanical property and structure of steel/mushy Al-20Sn bonding plate were studied. The results show that the relationship between solid fraction of Al-20Sn slurry and interfa-cial shear strength of bonding plate is S =52. 9+0. 998po -0. 0]44ip] (where S is interfacial shear strength, ipa is solid fraction ). The largest interfacial shear strength is 70. 2 MPa when solid fraction is 34. 6%. The interface of bonding plate is made up of Fe-AI compound and Fe-Al solid solution alternatively.
Role of A12O3 fiber in eutectic Al-Si alloy composites

The effects of A12O3 fiber on wear characteristics of eutectic Al-Si alloy composites were studied using a pin-on-disk tester under dry sliding condition. The results show that the A12O3 fiber can make matrix grain be fine specially the eutectic Si be finer and prevent the plastic flow of matrix and prohibit the crack propagation in the wear layer thereby it can remarkably improve the mechanical property and the wear resistance of the MMCs. Since A12O3 fiber plays a role of certain framework in protecting the matrix against crash, it can eliminate the severe wear of MMCs with higher mf of fiber from the beginning of test. At mild stage, when
Die wall lubricated warm compaction of iron-basedpowder metallurgy material

Lubricant is harmful to the mechanical properties of the sintered materials. Die wall lubrication was applied on warm compaction powder metallurgy in the hope of reducing the concentration level of the admixed lubricant. Iron-based samples were prepared by die wall lubricated warm compaction at 175 ℃, using a compacting pressure of 550MPa. Emulsified polytetrafluoroethylene(PTFE) was used as die wall lubricant. Admixed lubricant concentration ranging from 0 to 0.5% was tested. Extremely low admixed lubricant contents were used. Results show that in addition to the decrease in ejection forces, the green density of the compacts increases with the decrease of admixed lubricant content until it reaches the maximum at 0.06% of lubricant content, then decreases with the decrease of admixed lubricant content. The mechanical properties of the sintered compacts that contain more than 0.06% admixed lubricant are better than those of the samples that contain lesser lubricant. No scoring was observed in all die wall lubricated experiments.
Effect of oxygen content on tensile strength of polymer-derived SiC fibers

Air-curing is usually applied to the polymer-derived SiC fibers and, as a result, oxygen is embedded to the material. An effective relationship between oxygen content of the SiC fibers and mass gain of their precursor fibers was es-tablished. Results also showed that oxygen content has a great influence on the mechanical properties and excellent tensile strength is usually obtained at the oxygen content of 12% ~ 13% , similar to the density of SiC fibers. Oxygen content has a positive effect on the ceramic yield, and thus, is good to the density and tensile strength; while, oxygen content is also negative to volume content of SiC phase and crystallization of the SiC fibers, and thus, detrimental to the density and tensile strength. Both of the two effects result in the peak behavior of the tensile strength of SiC fibers.
Imitation design of temperature field in coloring hot dip galvanization process

Colors were generated by preferential oxidation of the metals in coloring hot dip galvanization process, and the evolution of temperature field during cooling after hot dip would be responsible for the coloration results directly. The in-fluences of bath temperature and velocity of steel strip moving on temperature field of the strip were calculated in continuous coloring hot dip galvanization process by means of the ANSYS/Thermal module. The factors were considered including con-vection heat transfer, latent heat during cooling, and heat radiation in calculation. The effects of temperature field on color-ation of sheet steel samples were investigated.
Characteristics of regional climate change and pattern analysis on Ordos Plateau

The characteristics of precipitation, temperature and their combination determine the special ecological environment pattern of Ordos Plateau. Analyzing its evolutionary trend attributes to understanding the succession process of the ecological environment of Ordos Plateau and has crucial instructional significance cm the ecological restoration research being conducted in this region. Four lime scales, arranging from ten days, one month, one season (growing season contrasting to non-growing season) to one year were adopted to analyze the climate data which included nearly 30 years and were collected by eight weather stations on Ordos Plateau. The results indicated that the mean annual temperature and the mean monthly temperature of February, September and December, had increased significantly during the late 30 years. The annual precipitation did not show significant changes but its distribution pattern had changed obviously. The ratio of precipitation of major growing season (May-October) to annual precipitation had increased distinctively,and five counties' precipitation reached statistically significant level. And the ratio of precipitation of latter growing season (September) to one year decreased significantly while the ratio of non-growing season (November-next April)to one year changed insignificantly. The results showed that maybe the interaction of increased mean temperature and insignificant change of precipitation in non-growing season was one of the reasons why the desertification of the region was deteriorating in recent years, lining some factors closely relating to vegetation succession such as mean annual temperature, mean annual precipitation, distributive pattern of precipitation, mean temperature of the coldest month? mean temperature of the warmest month, precipitation of the warmest month, mean temperature of growing season, precipitation of growing season, potential evapotranspiration(PKT)and radiative dryness index(RDI), to synthetically analyze the climate characteristics of Ordos Plateau. The regionalized Ordos Plateau to Lhree synthetical climate types were recognized uh follows: Type I, semi-humid and low evaporation (including Jungar Banner, Dongsheng City and Ejin Iioro Banner), Type II, semi-arid, semi-humid and moderate evaporation (including Uxin Banner and Daiad Banner), Type III,arid and high evaporation (including Hanggin Banner, Otog Banner and Otog Qian Banner) .
Hydrogen storage properties of nanocomposite Mg-Ni-MnO2 made by mechanical milling

The hydrogen storage properties of the nanocomposite Mg95Ni3(Mn02)2(niass fraction,   % ) were studied. The temperature changes in hydriding/dehydriding process were investigated.  The nanocomposite was fabricated by ball milling process of mixed elemental Mg, Ni and oxide maganese MnC>2 under hydrogen pressure (approximately 0.6 MPa). The hydrogen absorption and desorption properties of the samples milled for various times were investigated. A remarkable enhancement of hydrogen absorption kinetics and low operational desorption temperature have been found after the sample milled for over 57 h. For example, this nanocomposite can absorb hydrogen more than 6.0%  (mass fraction) in 60s at 200X3 under 2.0 MPa, and desorption capacity also exceeds 6.0 %  (mass fraction) in 400 s at 310 t under 0.1 MPa. The storage properties of samples milled for various times were studied and the kinetics of the samples were analyzed.
Effect of preannealing on crystallization process of amorphous Sm5Fe_(80)Cu_1Si_5B_3C_(2.5)Zr_(3.5) alloy

In the view of crystallization activation energy of amorphous alloy, the mechanism of coarse grain in annealed Sm_3Fe_(80)Cu_1Si_5B_3C_(2.5)Zr_(3.5) amorphous alloy was analyzed. It reveals the effect of preannealing on the process crystallization. The results show that preannealing can be used to change the crystallization behavior of the a-Fe phase in the Sm_2Fe_(17) Cu_1Si_5B_3C_(2.5)Zr_(3.5) amorphous alloy, which is helpful for forming a-Fe phase grains; and it is not large for Sm2Fe17C, phase.
Atomic simulation of amorphization and crystallization of Ag50Au50 alloy during rapid solidification

By means of constant, temperature and constant pressure molecular dynamic simulation technique, a series of simulations of the glass transition and crystallization processes of Ag5OAu3O were performed. The atoms interact via EAM po-tential function. Pair con-elation functions of liquid Ag5OAu50 during different cooling rates and temperatures were simulated to reveal the structural features of liquid, super-cooled liquid, glass state and crystal. The thermodynamics and kinetics of structure transition of Ag5OAu5O during cooling processes were performed.
Stability of Crystal Growth Face and Dissolution Face in Crystallization from Solution under Microgravity

The stability of the shapes of crystal growth face and dissolution face in a two-dimensional mathematical model of crystal growth from solution under microgravity is studied. It is proved that the stable shapes of crystal growth face and dissolution face do exist, which are suitably shaped curves with their upper parts inclined backward properly. The stable shapes of crystal growth faces and dissolution faces are calculated for various values of parameters, Ra, Pr and Sc. It is shown that the stronger the convection relative to the diffusion in solution is, the more backward the upper parts of the stable crystal growth face and dissolution face are inclined. The orientation and the shape of dissolution face hardly affect the stable shape of crystal growth face and vice versa.
Preparation and properties of nano- sized SeO2 powder

SnO2 powder was prepared by chemical precipitation method.  Effects of starting materials concentration, Ph value of final system and treating temperature on the particle size were investigated by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The parameters of chemical precipitation were optimized.   It is concluded that the concentration of starting material and pH value of final system has little effect on the SnO2 particle size, but heat treatment do greatly affect the particle size.  If the treating temperature is lower than 500 X. , the particle size has a good stability; otherwise, the particle size remarkably increases with increasing temperature. The dispersing agents have va-rious influences on SnO2 powder as the polarity of dispersing agents changed.
Correlation between liquid structure and γ_2 -phase precipitation of Cu-Al-Ni shape memory alloys

Cu71Al25Ni4(mole fraction,% ) shape memory alloy ribbons exhibit a good shape memory effect, which were prepared by melt-spinning technique. The microstructure of the as-spun ribbons was identified by D/Max-rA X-ray diffrac-tometer. The order degree of martensite increases with decreasing liquid quenching temperature at the same quenching rate. The liquid structure of Cu75Al25 and Cu7, Al25Ni4 was investigated using X-ray diffraction method. The distinct pre-peaks have been found in front of main peaks of the structure factors. The pre-peak increases intensity with decreasing temperature or adding Ni. Gaussian peaks decomposing radial distribution function ( RDF) indicated that Cu-Al distance is anomalously short. These results suggest that a strong interaction between Cu and Al is favorable to form /3-phase-like clusters, which leads to chemical medium-range ordering in melt. This promotes formation of order martensite and suppresses y2-phase pre-cipitation.
Effect of TiO_2 surface properties on the SCR activity of NOx emission abatement catalyst

NOx emission abatement catalysts V_2O_5 supported on various TiOi including anatase, rutile and mixture of both were investigated with various physieo-ehemicul measurements such as BET, NH_3-TPD, NAHP, XHD and so on, and the effect of TiO_2 surface properties on the SCR C selective catalytic reduction) activity of V_2O_5TiO_2 catalysts was studied. It was found that the TilK surface properties had strong aifect on the SCR activity of V_2O_5TiO_2 catalysts. The stronger acidic property resulted in the higher exposure of active sites as well as the higher SCR activity.
Biodegradation of acetanilide herbicides acetochlor and butachlor in soil

The biodogradalion nf two acetanilide herbicides, acetochlor and butachlor in soil alter other environmental organic matters addition were measured during 35 days laboratory incubations. The herbicides were applied to soil alone, soil-SDBS (sodium dodra'yllienzene sulibnale) mixtures and soil-HA ( Imnric acid) mixtures. Herbicide biodegradation kinetics were compared in the different Ireatmenl. Biodegradalion products of herbicides in soil alone samples were identified by GC/MS at the end of incubation. Addition of SDBS and HA to soil decreased acetochlor hiodejrradation, but increased butachlor biodegradalion. The biodegradation half-life of acetochlor and butachlor in soil alone, soil-SDBS mixtures and soil-HA mixtures were 4.6d, 6. Id and 5.4d and 5.3d, 4.9d and 5.3d respectively. The biodegradation products were hydroxyaeetochlor and 2-methyl-6-ethylaniline for acelochlor, and hydroxybulachlor and 2,6-diethylaniline for butachlor.
Effects of Mo substituted Nb on magnetic properties of Finemet alloy

Different Mo contents have been added into traditional Finemet alloy to form Fe73.5CujNb3_.,. Mo^Si^Bg.s (x = 0~3) alloys. The change in DC and AC magnetic properties with Mo for Nb substitution was investigated. The re-sults show that, with adding Mo, although the DC relative permeability decreases and the coercive force increases slightly, the saturation flux density Bs can be increased, and the core loss of the alloy can be decreased. The AC permeability of samples contained Mo is higher than that of alloy without Mo content. Fe73.5CuiNbiMo2Si13Bi).5 alloy has the highest sat-uration flux density Bs- Fe73 5Cu1Nb2MoiSi13B9,5 alloy has the best frequency dependence on the AC permeability and core loss.
Splicing growth of zeolite 4A in hydrothermal system

The morphology evolution of zeolite 4A in hydrothermal system was studied via XRD, TEM and electron diffractometry. A phenomenon of aggregation of nano-crystals of zeolite 4A exists in the crystallization process, and microcrystals are derived from nano-crystal aggregating directly. The splicing growth model of zeolite 4A is described as: 1)an induction period which exists at the beginning of crystallization, 2)followed by many nano-meter crystals initiating immediately, and 3)the nanocrystals congregated as slices and spliced with each other to form a larger crystal.
Itstudies on the effect of urea on the compatibility of pmma/pvc mixtures in dmf by a dilute-solution viscometry method

The interaction between poly(methymethacrylate) (PMMA) and poly(vinyl chloride) (PVC) has been studied in dilute urea solutions of ditnethylformamide (DMF) at 28℃ using a dilute solution viscometry method . The results show that the polymer mixtures are compatible in DMF solution in the absence of urea. The influence of urea addition on the degree of compatibility of the polymer mixtures has been studied in terms of the compatibility parameters (Δb_m and Δ[η]_m). It was found that the compatibility of the polymer mixtures is decreased with increasing urea addition, passing through a minimum at 0.5 M urea.
Enhancement of damping preformance of polymers by functional small molecules

The addition effects of organic small molecular substances Ar,A?'-dicyclohexyl-benzothiazyl-2-sulfenaniide (DZ) and,9-bis{l,l-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl}-2,4,8,10-tetraoxaspiro[5)5]-un-decane (AO-80) on the dynamic mechanical properties of chlorinated polyethylene (CPE), chlorinated polypropylene (CPP), acrylate rubber (ACM) and their blends were investigated. In the case of compatible systems such as CPE/DZ and ACM/AO-80, the height of the loss tangent (XanS) peak of a matrix polymer (CPE or ACM) increases, and its peak position shifts to a higher temperature with the addition of DZ or AO-80. By contrast, for incompatible CPE/AO-80, a novel transition appeared above the glass transition temperature of CPE. This additional transition was assigned to dissociation of the intermolecular hydrogen bond between the a-hydrogen of CPE and the hydroxyl groups of AO-80 within the AO-80-rich domain. This will provide a new concept for developing damping material. However, the minimum value between two tan￡ peaks is lower. It was found that the temperature dependence of tan
Unification of viscose models for powder suspension system

The viscose models for powder suspension system was reviewed and analysed. It is found that by introducing modification function f(φ) in the differential form of classical Einstein's viscosity law, all of viscose models can be unified if f(φ) takes suitable form . Some rational forms of the function f(φ) were discussed according to functional approximation method, and a new rheological model contained two undetermined parameters was consequently developed, more suitable for high particle concentration dispersing system. The experimental results show that this new model is of better consistence.
Antibodies against the C-terminal peptide of rabbit oviductin inhibit mouse early embryo development to pass 2-cell stage

A full-length rabbit oviductin cDNA(1909bp) was cloned. It consists of a 5'-UTR of 52bp, an open reading frame (ORF) of 1374bp and a 3'-UTR of 483bp and has more than 80% homology with that of other mammal oviductins. N-terminal peptide (NTP) (384 residues) and C-terminal peptide (CTP) (73 residues) of deduced protein precursor has about 80% and 50% identity with that of other mammals respectively. Fusion proteins GST-NTP 368(lR-368N)and GST-CTP73 (369F-441A) were expressed and purified. NH2-terminal of CTP sequencing reveals that the purified protein is consistent with the deduced one. In order to study the function of NTP and CTP the mouse anti-NTP and rabbit anti-CTP antisera were prepared. Tissue-specific (skeleton muscle, oviduct, uterus, ovary, liver, heart and brain) analysis indicated that rabbit oviductin was only found in oviduct. The conditioned medium derived from the rabbit oviduct mucosa epithelial cells has a function of overcoming the early embryonic development block of Kunming mouse cultured in vitro. Anti-CTP antiserum could totally inhibit the early embryo development at 2-cell stage cultured in the conditioned culture medium, but anti-NTP antiserum couldn't. There was a positive relationship between the ratio of early embryos at development block and the dosage of anti-CTP antiserum added in the conditioned culture medium. These results suggest that oviductin has a function not only on fertilization, but also on the release of early embryonic development block, and the later function domain of rabbit oviductin ma,y be situate in its C-terminal.
Overexpression of heme oxygenase-1 protects smooth muscle cells against oxidative injury and inhibits cell proliferation

To investigate whether the expression of exogenous heme oxygenase-1 (HO-1) gene within vascular smooth muscle cells (VSMC) could protect the cells from free radical attack and inhibit cell proliferation, we established an in vitro transfection of human HO-1 gene into rat VSMC mediated by a retroviral vector. The results showed that the profound expression of HO-1 protein as well as HO activity was 1.8- and 2.0-fold increased respectively in the transfected cells compared to the non-transfected ones. The treatment of VSMC with different concentrations of H_2O_2 led to the remarkable cell damage as indicated by survival rate and LDH leakage. However, the resistance of the HO-1 transfected VSMC against H_2O_2 was significantly raised. This protective effect was dramatically diminished when the transfected VSMC were pretreated with ZnPP-IX, a specific inhibitor of HO, for 24 h. In addition, we found that the growth potential of the transfected cells was significantly inhibited directly by increased activity of HO-1, and this effect might be related to decreased phosphorylation of MAPK. These results suggest that the overexpression of introduced hHO-1 is potentially able to reduce the risk factors of atherosclerosis, partially due to its cellular protection against oxidative injury and to its inhibitory effect on cellular proliferation.
POLYMERIZATION OF ETHYLENE WITH UNSYMMETRIC 2,6-BIS(IMINO)PYRIDINE IRON(II) COMPLEX

An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyst structure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and the effects of polymerization conditions such as temperature, aluminum/iron molar ratio on the activity of catalyst and the characteristics of polyethylene were reported. The unsymmetric catalyst lr has a good catalytic performance of 3.47 * 10~6 gPE · mol~(-1)·Fe · h~(-1) at 40℃ with aluminum/iron molar ratio = 2500. A dependence of catalyst activity on the methylaluminoxane (MAO) concentration and reaction temperature was found. The molecular weight (MW) of polyethylene with broad dispersity is about 10~4-1O~5 g/rnol. The melting temperature and branching of polyethylenes vary with changing reaction temperature and aluminum/iron molar ratio.