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Carbon brushes are commonly used on DC or AC applications such as commutators and slip rings. The commutator application has been studied extensively and there are many trouble shooting tools to assist the technician at resolving motor or generator problems. Slip ring applications have been widely used on high speed turbine generators, slower speed synchronous motor/generators and wound rotor motors...
In this paper, the finite element model of C/C-SiC microstructure characterizing different scale parameters was established for the woven C/C-SiC composites. The strain energy method was used to study the effects of relevant parameters for the microstructure upon the macroscopic performances of C/C-SiC composites. A model of microstructure optimization for C/C-SiC composite was present according to...
The principal objective of this work is to implement a new material development paradigm using atomistic simulations to guide the molecular design of materials. Traditional empirical macroscopic material development studies omit the fundamental insight needed to understand material behavior at the atomic and molecular levels where material response begins. The new paradigm relies heavily on a tight...
In this study, we present a newly developed carbon aluminum thermal management composite material that has a CTE less than 7.5 ppm/K, thermal conductivity over 400 W/mK, and the thermal diffusivity is 2.5 - 3 times higher than that of Cu and Al. In addition, the composite material is lightweight, and can be easily machined. We also show anisotropy in thermal performance aligning along carbon matrix...
Degradation of polyacrylamide(PAM) in aqueous solution was studied by using Fe2O3/Al2O3 or Fe2O3/carbon as heterogeneous catalyst in the presence of H2O2. In order to improve the catalytic activity, Effects of catalyst preparation conditions as impregnated materials, acid dipping and adding trace elements to catalyst activity were studied in the experiment. It was observed that Compared with Fe2(SO4)3,...
The Carbon fiber/Polylatide/Chitosan(C/PLA/CS) biomaterial composites were fabricated by using solvent blending and immersed glue moulding process, and the mechanical properties of the composites before and after degradation were researched in bending and shear modes. The results shows that the C/PLA/CS composites have excellent mechanical properties, while the volume fraction of CF and mass fraction...
In this paper, based on the simple Pz orbital model, the energy diagram of armchair and zigzag graphene nanoribbons (A-GNR & Z-GNR) are studied by considering the first and third nearest neighbors (FNN & TNN). Then, we applied the Non-Equilibrium Green Function method to calculate the conduction in A-GNR. Thereafter, we analyzed the single gated GNRFET in real space provided that under any...
Biomass energy is an important resource in resolving the energy crisis and pyrolysis is the most important method in making use of it. Pyrolysis in the absence of oxygen is called as carbonization. Biomass could be converted to charcoal, liquid and gas products using the carbonization process at different temperatures. The chemical composition and yields of charcoal, liquid and gas are determined...
The ozonation of three chloronitrobenzene isomers (p-, m-, o-chloro-nitrobenzene, CNB) were investigated. CNBs was effectively degraded by ozone but cloud not be mineralized completely. During the ozonation of CNBs process, the inorganic carbon, Cl- and NO3- increased gradually, and chloro-(-Cl) and nitro-(-NO2) group all turn to Cl- and NO3- calculated by stoichiometry. The degradation products of...
Dry seeds, water-soaked seeds and seedlings of rice were exposed to carbon ion radiation at doses of 0.02-20 Gy. Biological effects on survival, chromosomal aberrations and activity of protective enzymes against activated oxygen including superoxide dismutase (SOD) and catalase (CAT) as well as content of malondialdehyde (MDA) were detected. Oxidative damages were observed in both seeds and seedlings...
Summary form only given. The particle acceleration up to 250 keV (electrons) was observed in the divergent gas-puff z pinch experiments with the 25 kV charged voltage of capacitors. The main trigger of the acceleration may be attributed to the fact that the spatial distribution of the initial media (injected gas) had been inclined axially just like a plasma focus device. This is because the more compressed...
The electrical behavior between carbon and cement was studied by single fiber pull-out testing in this paper. The contact electrical resistance increased as the interfacial bonding force increasing and had good electromechanical reversibility. The variation of the interfacial shear stress causes the change of interfacial structure and results in the change of the conductive network of the composites...
In order to optimize the adsorption capacity of room-temperature catalytic oxidation (RCO) composite on indoor formaldehyde, two methodologies are investigated in this study with different purposes. One focuses on physical characteristics, where a series of experiments were set up to examine the impact of preparation conditions and ingredient dosages on the mechanical strength of RCO material. The...
The electronic properties of pristine and B doped triangular graphene sheets have been investigated by using density functional theory calculations. After doping B atom, most of C-C bonds increase and also increase HOMO-LUMO energy gap. The effects of doping on the Milliken charges and molecular distribution have been studied as well.
Making use of jujube kernel as the main material, jujube kernel activated carbon was prepared with a microwave-induced activation process using phosphoric acid and zinc chloride as the activating agent. The effects of various factors such as microwave power, radiation time, activation agent/carbon ratio and activation agent concentration on the activation have been studied. Experimental results indicated...
The fungal mycelial pellets of Aspergillus fumigatus was used for the removal of humic acid from aqueous solution. The impact of culture age, mycelial pellets preservation time, and different nutrition-cultured mycelial pellets on the biosorption of humic acid was studied. The results showed that humic acid could be adsorbed by Aspergillus fumigatus mycelial pellets. Sucrose could be a good cultivate...
Through incubation of one kind of paddy soil with different concentration of phenanthrene, the paper discusses the change of contents and its effect on enzyme activity in the paddy soil. The result indicated that contents of phenanthrene added to soil decreased gradually with incubation day. After incubation for 56d, the content of phenanthrene with high concentration (1.6 and 3.2μg/g ) declined more,...
Aromatic hydrocarbons recommended as the persistent organic pollutants distribute widely in atmospheric environment. PAHs (polycyclic aromatic hydrocarbons) and BTEX (benzene, toluene, ethyl benzene and p-xylene) are harmful to the environment and health of people, since they are the precursors of photochemical oxidants and agents of the acid rain, and have high degree of mutagenicity and carcinogenicity...
Tetracycline is a series of emerging pharmaceutical and personal care products (PPCPs), which has been caught increasing concern in recent years. As a new type of carbon materials, activated carbon fiber (ACF) demonstrates its excellent adsorption performance especially in organic pollutants removal. ACF was used for tetracycline removal by adsorption and the effect of ACF dosage, contact time, salinity,...
The existing efforts on carbon footprint studies of manufacturing processes are focused largely on emissions assessment for product compliance reporting. Relatively little attention has been given to analyzing how process properties affect these emissions for carbon footprint reduction. Going beyond assessment calculation into carbon footprint improvement, this paper presents a method for modeling...
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