Showing papers by "Taiyuan University of Technology published in 2006"
TL;DR: In this paper, the adsorption of CO2 on a raw activated carbon A and three modified activated carbon samples B, C, and D at temperatures ranging from 303 to 333 K and the thermodynamics of adsoreption have been investigated using a vacuum adsorization apparatus in order to obtain more information about the effect of CO 2 on removal of organic sulfur-containing compounds in industrial gases.
209 citations
TL;DR: The experiment showed that not only the activation temperature, activation time and the mass ratio of KOH to the carbonized material, but also the activated methods using activator obviously influenced the SSA of activated carbon.
170 citations
TL;DR: In this article, a variety of transition metal tetrahydro-Schiff base complexes have been encapsulated in zeolite Y with flexible ligand method for the first time, and the prepared samples were characterized with X-ray diffraction, diffuse reflectance UV-vis spectroscopy, Infrared spectrography, N2 adsorption/desorption at −196°C, elemental analysis, as well as thermo-gravimetry and differential-thermal analysis techniques.
Abstract: A variety of transition metal (M = Cu, Co, Fe and Mn) tetrahydro-Schiff base complexes (denoted as M–[H4]Schiff with Schiff = salen, salpn and salicyhexen, see Scheme 1 ) have been encapsulated in zeolite Y with flexible ligand method for the first time. The prepared samples were characterized with X-ray diffraction, diffuse reflectance UV–vis spectroscopy, Infrared spectroscopy, N2 adsorption/desorption at −196 °C, elemental analysis, as well as thermo-gravimetry and differential-thermal analysis techniques. The formation of tetrahydro-Schiff base ligand was confirmed with 1H NMR and IR spectroscopy before complexing. The prepared M–[H4]Schiff/Y catalysts such as Cu–[H4]salen/Y showed much higher conversion in the oxidation of cyclohexane than the corresponding M–Schiff analogues encapsulated in zeolite Y as a result of the incorporation of larger amounts and the stronger oxidation ability of tetrahydro-Schiff base complexes. In addition, the M–[H4]Schiff/Y catalysts were also active for the oxidation of other cycloalkanes although their activity depended on the reaction conditions as well as the central transition metals of the complexes and the substrate molecules. It was shown that the catalytic reaction occurred via a radical mechanism. The time for the addition of H2O2 significantly affected the catalytic performance. Earlier (e.g. 20 min) addition of H2O2 than substrate molecules to the reaction system led to a drastic reduction in the catalytic activity.
121 citations
TL;DR: In this article, the compressive deformation behavior of open-cell aluminum foams with different densities and morphologies was assessed under quasi-static and dynamic loading conditions, and the experimental results showed that density is the primary variable characterizing the elastic modulus and yield strength of foams.
95 citations
TL;DR: In this paper, the photocatalytic degradation of phenol in water was evaluated by photocatalysis degradation of titanium dioxide nano-powders, and the results showed that doping with Ce content of 0.08% ∼ 0.4% can significantly decrease the light absorption ability of TiO2.
92 citations
TL;DR: In this article, the physical and mechanical properties of salt rock under different temperature conditions are studied to ensure the integrity of the salt rock repository and the safe isolation of nuclear wastes from the biosphere.
Abstract: Because of its advantageous physical and mechanical characteristics, salt rock is considered an excellent host rock for nuclear waste disposal. Nuclear wastes in a salt rock repository will continue to emit radiation and thermal energy for decades after placement, resulting in a significant rise of the surrounding salt rock temperature. Consequently, study of the physical and mechanical characteristics of salt rock under different temperature conditions is essential to ensure the integrity of the salt rock repository and the safe isolation of nuclear wastes from the biosphere.
90 citations
TL;DR: In this article, a simple and one-step synthesis method of metal-containing carbon nanocapsules using an arc discharge in aqueous solution is reported, and it was found that Ni, Co and Fe nanoparticles could be in situ encapsulated in carbon shells when the arc was performed respectively in aaqueous solutions of NiSO 4, CoSO 4 and FeSO 4.
77 citations
TL;DR: In this article, the authors estimate the domestic environmental and health benefits of exploiting China's energy-related CDM potential, which may save between 3,000 and 40,000 lives annually.
Abstract: We estimate the domestic environmental and health benefits of exploiting China's energy-related CDM potential. Exploiting the CDM potential may save between 3,000 and 40,000 lives annually. Additional gains are estimated to reach upwards from 1 billion RMB annually. The key to these gains is the fact that actions and measures to reduce CO2 emissions also reduce emissions of TSP and SO2. In our estimate, exploiting the CDM-potential will cut SO2-emissions by between one-half and three million tons annually. To arrive at these conclusions we synthesize a significant body of recent research on co-benefits of climate abatement in China.
70 citations
15 Nov 2006-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, didymium was added to the Mg-5-wt% Sn alloy to improve the tensile strength and elongation of the alloys, and optimum mechanical results were attained at an addition of 20 ¼ ¼ wt% Didymium where the UTS increased by 269% and the elongation by 77%.
Abstract: The didymium (neodymium–praseodymium mixed metal, neodymium:praseodymium = 3:1) addition to the Mg–5 wt%Sn alloy results in the formation of a feather-shaped Sn x (Nd,Pr) y phase mainly on the grain boundaries, and gives rise to grain refinement when the addition is below 2 wt% The tensile strength and elongation of the alloys are improved with the addition of didymium, and optimum mechanical results are attained at an addition of 20 wt% didymium, where the UTS increased by 269% and the elongation by 77% The feather-shaped Sn x (Nd,Pr) y phase changes to a stick-shaped Sn x (Nd,Pr) y phase when the didymium addition is over 2 wt% As a consequence, the tensile strength and especially the elongation show an obvious decline
65 citations
TL;DR: In this paper, a Pt/OLF catalyst was synthesized by an impregnation-reduction method and its structure and morphology were characterized by XRD, HRTEM and XPS.
64 citations
TL;DR: In this paper, the effects of cell size on the quasi-static and dynamic compressive properties of open cell aluminum foams produced by the infiltrating process were studied experimentally.
TL;DR: In this paper, a single crystal hexagonal wurtzite GaN was synthesized on Si wafer by ammoniating reaction in the absence of catalyst and the results showed that the formed nanowires are straight and smooth, with even diameters ranging from 5 to 20nm and length up to several tens of micrometers.
TL;DR: In this paper, the effects of curing time and testing frequency on the velocity of ultrasonic waves propagating along rock bolts grouted in concrete were investigated and the results demonstrate the importance of optimizing the selection of test frequencies and suggest the possibility of a new approach based on wave velocity decrease for testing the grout quality of rock bolts.
TL;DR: In this article, the deformation mode of a spherical shell was developed by introducing an isometric transformation of surface bending and the Perzyna-Symonds viscoplastic constitutive equations.
TL;DR: In this article, an ultrasonic crystallization method was introduced for the preparation of ZnAl-hydrotalcite-like compounds (ZnAl -HTLcs), and the results proved that both ultrasonic frequency and ultrasonic power have effects on the sizes of the product particles.
TL;DR: A series of Ru(III) tetrahydro-Schiff base complexes were encapsulated in the supercages of zeolite Y by flexible ligand method in this article.
TL;DR: In this article, a high-purity VGCF with a diameter of 150-200nm and a maximum length of 10-40μm was obtained from the thermal cracking of deoiled asphalt with ferrocene as catalyst by chemical vapor deposition (CVD) in argon atmosphere.
TL;DR: In this article, various carbon materials, including vapor grown carbon fibers (VGCFs) and carbon trees, were synthesized by chemical vapor deposition in argon atmosphere, using deoiled asphalt as carbon source and ferrocene as catalyst.
TL;DR: In this article, the primary aerobic biodegradability of linear alcohol and oxo alcohol APG was compared in a shaking-flask test, and it was shown that more than 87% of the APG could be degraded after 21 d and are therefore completely green surfactants.
Abstract: Alkylpolyglucosides (APG) prepared on the basis of renewable raw materials have been proven ultimately readily biodegradable. They are completely green surfactants. With the development of the petrochemical industry, APG prepared by oxo alcohol have been widely used recently. They have equal physicochemical properties with those prepared with renewable raw materials, but there is little information about their environmental compatibility. Primary aerobic biodegradability of linear alcohol and oxo alcohol APG was compared in this study. The results showed that oxo APG had similar good blodegradability with linear alcohol APG. In a shaking-flask test, more than 87% APG could be degraded after 21 d and are therefore completely green surfactants. The relationship between structure and biodegradability was studied. The hydrophobic and hydrophilic groups affected their biodegradation. Biodegradability deteriorated with increasing chain length and size of head groups. Branching did not affect their biodegradation. The degradation rate decreased with increasing head group size. Monoglucoside degraded faster than diglucosides, and diglucosides degraded faster than polyglucosides. Accordingly, a potential degradation pathway was proposed. APG were hydrolyzed to alcohol and polysaccharide in the first step, then the alcohol was oxidized to CO2 and H2O by β or α oxidation. The polysaccharide was hydrolyzed to glucose, and then the glucose was degraded by a glucose metabolism mechanism. This pathway provided a good explanation of the experiment results.
TL;DR: Fe-included onion-like Fullerenes (OLF) have been synthesized by Chemical Vapor Deposition (CVD) at 1100 °C in all zones as mentioned in this paper.
TL;DR: In this article, a large body of experimental corn stover pyrolysis yields measured with a Pyroprobe-FTIR system at Taiyuan University of Technology (TUT) using a wide range of heating rates is organized using an analytical semi-empirical model.
TL;DR: In this article, a predator-prey system with stocking of prey and harvesting of predator impulsively is studied, and the existence and global asymptotic stability of the boundary periodic solution are proved, which implies that the system will be extinct.
Abstract: In this paper, a predator–prey system with stocking of prey and harvesting of predator impulsively is studied. Here, the prey population is stocked with a constant quantity and the predator population is harvested at a rate proportional to the species itself at fixed moments. Under some conditions, the existence and global asymptotic stability of the boundary periodic solution are proved, which implies that the system will be extinct; and given some different restrictions, ultimate positive upper and lower bounds of all solutions are obtained, showing the system being permanent. At last, two examples are given to illustrate our results. Copyright © 2005 John Wiley & Sons, Ltd.
TL;DR: In this paper, a series of MAPO-5 and (M, N)APO5 molecular sieves have been synthesized and characterized with XRD, ICP, DRS UV-vis spectroscopy, ESR, 27 Al MAS NMR techniques to explore the valence, coordination and location of incorporated transition metal ions.
TL;DR: Optimal carbon substrates, which are helpful in the cultivation and retention of well-settling granules and in the enhancement of the overall ability of the aerobic granules reactors, were found.
Abstract: The effects of different substrates on the aerobic granulation process were studied using laboratory-scale sequencing batch reactors (SBRs). Four parallel granules sequencing batch reactors (GSBR): R1, R2, R3, and R4 were fed with acetate, glucose, peptone and fecula, respectively. Stable aerobic granules were successfully cultivated in R1, R2, R4, and smaller granules less than 500 μm were formed in R3. Morphology and the physic-chemical characteristics of aerobic granules fed with different carbon substrates were investigated by the four reactors operated under the same pressure. The aerobic granules in the four reactors were observed and found that peptone was the most stable one due to its good settleability even after a sludge age as short as 10 d. A strong correlation was testified between the characteristics of aerobic granules and the properties of carbon substrates. The stability of aerobic granules was affected by extracellular polymer substances (EPS) derived from microorganism growth during feast time fed with different carbon substrates, and the influence of the property of storage substance was greater than that of its quantity. Optimal carbon substrates, which are helpful in the cultivation and retention of well-settling granules and in the enhancement of the overall ability of the aerobic granules reactors, were found.
TL;DR: In this article, a CDS 2000 Pyroprobe with a Bio-Rad FTS165 FTIR detector is used to measure yields of 3 products and 7 families of products from corn cobs pyrolysis at temperatures up to 900 ∘ C using a wide range of heating rates.
Abstract: Pyrolysis of various forms of biomass could convert this primary energy source into valuable liquid or gaseous fuels or chemicals. In this study a CDS 2000 Pyroprobe, with a Bio-Rad FTS165 FTIR detector are used to measure yields of 3 products and 7 families of products from corn cobs pyrolysis at temperatures up to 900 ∘ C using a wide range of heating rates. An analytical semi-empirical model is then used to approximately represent these results using a relatively small number of parameters. The compact representation can be used in applications to conveniently extrapolate and interpolate these results to other temperatures and heating rates.
TL;DR: In this paper, the origin of atmospheric polycyclic aromatic hydrocarbons (PAHs) in total suspended particulate (TSP) and particulate matter below 10 micrometers in diameter (PM10) collected in the urban areas of Urumchi and Zhengzhou, China, are discussed on the basis of carbon isotopic compositions of individual compounds.
Abstract: Origins of atmospheric polycyclic aromatic hydrocarbons (PAHs) in total suspended particulate (TSP) and particulate matter below 10 micrometers in diameter (PM10) collected in the urban areas of Urumchi and Zhengzhou, China, are discussed on the basis of carbon isotopic compositions of individual compounds. Carbon isotope ratios were measured with the system of GC-C-IRMS with an error (1σ) of less than 0.6‰. δ13C values of atmospheric PAHs in Urumchi range from -23.6‰ to -32.1‰ and from -22.5‰ to -31.0‰ in Zhengzhou. δ13C values of low-weight molecules (pyrene, fluoranthene, benzo[e]pyrene etc.) in PAHs from the two cities are concordant, and range from -23.0‰∼-25.8‰. However, the high-weight individual compounds of atmospheric PAHs in Urumchi are more depleted in 13C with increasing molecular weight of PAHs than those in Zhengzhou. δ13C mean values of benzo[a]pyrene, indeno(1,2,3-cd)pyrene and benzo(ghi)perylene in Urumchi are -28.3‰, -31.5‰ and -29.7‰, respectively. The values of those three compounds in Zhengzhou, however, are -24.5‰, -29.4‰ and -26.3‰, respectively. Our data, incorporated with the analysis of the consumption of coal and amount of motor vehicles, indicate that PAHs are mainly contributed by coal combustion in the two cities, and the contribution of automobile exhaust to PAHs in Zhengzhou is larger than that in Urumchi during the sampling period.
TL;DR: In this paper, the effect of La on the microstructures of grain refiner was studied by OM, TEM, SEM, XRD, and EDS, and the experimental results indicate that La can improve the wettability between liquid aluminum and graphite; the addition of La results in dispersive distribution of TiAl 3 and TiC particles in the matrix.
23 Oct 2006
TL;DR: A novel algorithm (APFGA) combining APF with GA is put forward for the path planning and obstacle-avoidance and results indicate that the soccer robot can avoid the obstacles and explore the optimal path by the algorithm presented.
Abstract: It is a key problem in the robot soccer game that is the global path planning and obstacle-avoidance of the soccer robots. The path planning is always gotten into the local minimum value solved by the traditional Artificial Potential Field (APF). However, it can be improved by Genetic Algorithm (GA). In this paper, a novel algorithm (APFGA) combining APF with GA is put forward for the path planning and obstacle-avoidance. First, the algorithm confirms the effective area of obstacle-avoidance and the manner of path generation based on APF, and then it adopts the compact fitness function and designs the genetic operators in detail. Furthermore, the author uses the least square method for curve fitting. In the end, the simulation results indicate that the soccer robot can avoid the obstacles and explore the optimal path by the algorithm presented in this paper.
TL;DR: In this paper, the isosteric heat of adsorption on one raw and three modified activated carbon samples at different temperatures from 303-K to 333-K and the thermodynamics of adaption have been investigated using a vacuum adorption apparatus.